JP2000114117A - Solid electrolytic capacitor and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a simple sheathing means of a capacitor which has high dimensional precision by installing tubes composed of flexible material on round rod parts of electrode leading-out means, and inserting the round rod parts with the tubes in penetrating holes of a sealing means composed of hard material. SOLUTION: A capacitor element 1 in which both electrode foils with which lead terminals 5 are connected are wound via a separator, and a solid state electrolyte layer is formed between both of the electrode foils is accommodated in a cylindrical close-end sheathing case 2 made of aluminum or the like. Tubes 10, composed of material having high elastic modules, are installed on the outer peripheries of round rod parts 5b of the lead terminals 5. The lead terminals 5 with the tubes 10 are led out to the outside, penetrating a sealing member 11 installed on the inner periphery of an aperture part of the sheathing case 2. The sealing member 11 is constituted by installing an elastic ring 13, composed of flexible material on the outer periphery of a sealing plate 12 made of a material harder than the tubes 10. The lead terminals 5 with the tubes 10 are inserted in a pair of through holes 14 formed on the sealing plate 12, respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solid electrolytic capacitor and a method for manufacturing the same, and more particularly, to a solid electrolytic capacitor having an improved sealing structure and a method for manufacturing the same, in order to provide a simple and highly dimensionally accurate capacitor exterior means. It is about the method.

[0002]

2. Description of the Related Art A solid electrolytic capacitor uses a solid electrolyte having conductivity instead of a liquid electrolyte lacking in impedance characteristics in a high frequency range. Conventionally,
The element of such a solid electrolytic capacitor is formed by forming a solid electrolyte layer made of manganese dioxide or the like on an anode body made of a valve metal such as aluminum or tantalum. The exterior structure of the element is formed by covering the outer surface of the element with a resin layer such as a dip or a mold.

FIG. 13 shows a general configuration of a conventional solid electrolytic capacitor. That is, as shown in FIG. 13, the wound capacitor element 1 is housed in a bottomed cylindrical outer case 2 made of aluminum or the like, and the inside and the entire outer peripheral surface thereof are covered with an epoxy resin layer 3. The opening of the outer case 2 is sealed by a sealing rubber (sealing body) 4. Reference numeral 5 in the drawing denotes a lead terminal derived from the capacitor element 1. This lead terminal 5
14, a flat plate portion 5a connected to the electrode foil, a round bar portion 5b for penetrating the sealing body, and an external connection portion 5 as shown in FIG.
c.

[0004] The solid electrolytic capacitor having such a configuration is specifically manufactured by the following procedure. First, a capacitor element 1 is formed by winding a bipolar electrode foil made of a valve metal such as aluminum and having an oxide film layer formed on a surface thereof through a separator, and then a polyethylene is placed between the bipolar electrode foils of the capacitor element 1. Dioxythiophene (P
A solid electrolyte layer made of EDT) or the like is generated.

[0005] Next, the capacitor element 1 is housed in an outer case 2, and a two-part epoxy resin using an acid anhydride-based curing agent is filled between the outer case 2 and the capacitor element 1. . In this case, since the volume of the capacitor element 1 is non-uniform due to the generation of the solid electrolyte on the surface thereof, even if the volume of the capacitor element 1 is the minimum, the entire capacitor element 1 can be immersed in the resin. Is filled with a sufficient amount of epoxy resin.

Subsequently, the sealing rubber 4 is attached to the opening of the outer case 2 and the outer case 2 is sealed by caulking the opening end of the outer case 2. Thereafter, by heating and curing at a temperature corresponding to the type of the epoxy resin, the epoxy resin layer 3 covering the inside and the entire outer peripheral surface of the capacitor element 1 is formed.

As described above, in a solid electrolytic capacitor, a capacitor element on which a solid electrolyte such as manganese dioxide, TCNQ (tetracyanoquinodimethane), or PEDT is formed is covered with a resin layer. The first reason is that in an electrolytic capacitor using a solid electrolyte, the rate of change in characteristics with respect to the water content is larger than that in an electrolytic capacitor using an electrolytic solution. This is for maintaining the moisture resistance.

The second reason is to prevent an increase in leakage current. That is, in the case of a solid electrolytic capacitor,
Since the re-formation property of the anodic oxide film is several steps inferior to ordinary electrolytic capacitors, if the oxide film is damaged, the re-formability will be poor even if re-formation is performed later, and the leakage current will increase. is there. The damage to the oxide film is often caused when a lateral force is applied to the lead terminal 5 as the electrode lead-out means. This is because, when a lateral force is applied to the electrode lead means, the force is transmitted to the connection between the electrode lead means and the electrode foil, and the force is applied to the electrode foil, thereby damaging the oxide film. It is considered to be. Therefore, even if a lateral force is applied to the electrode lead-out means, the capacitor element is covered with resin so that this force is not transmitted to the electrode foil.
A resin layer is formed in the vicinity of the round bar portion 5b to fix the round bar portion of the electrode lead-out means.

[0009]

However, as described above, the method of coating a capacitor element with a resin layer is inferior in workability, and the state of coating the resin layer affects the characteristics of the capacitor. Was. Also, usually, after processing of the capacitor element, there is a variation in the interval, inclination, etc. of the electrode lead-out means. Therefore, if the resin coating is performed as it is, the variation in the dimension will cause the variation in the dimension of the product. There was a problem.

[0010] Furthermore, rubber is used as the sealing member, but the sealing method using rubber does not provide sufficient sealing properties. Also, since the fixing of the electrode lead means is not strong, when a force from the side is applied to the electrode lead means, the force is transmitted to a connection portion between the electrode lead means and the electrode foil, and a force is applied to the electrode foil. As a result, the oxide film is damaged and the leakage current increases.

The present invention has been proposed to solve the above-mentioned problems of the prior art.
It is an object of the present invention to provide a solid electrolytic capacitor provided with a simple and high-dimensional capacitor exterior means by improving the sealing structure, and a method of manufacturing the same.

[0012]

In order to solve the above-mentioned problems, the invention according to claim 1 is characterized in that the bipolar electrode foil to which the electrode lead-out means is connected is wound via a separator, and a solid is placed between the bipolar electrode foils. A capacitor element having an electrolyte layer formed therein, and a bottomed cylindrical outer case for housing the capacitor element,
Sealing means attached to the opening of the outer case, wherein the electrode lead means comprises a flat plate part for internal connection, a round bar part for sealing means penetration and an external connection part, and the electrode lead means is In the solid electrolytic capacitor drawn out of the outer case through a through hole provided in the sealing means, a tube made of a material having a high elastic modulus is attached to the outer periphery of the round bar portion of the electrode drawing means, and the sealing is performed. The means is constituted by a sealing plate made of a material harder than the tube, and the round bar with the tube is inserted into a through hole of the sealing plate.

[0013] According to the solid electrolytic capacitor of the first aspect having the above-described structure, first, since the sealing means is formed of the sealing plate made of a hard material, gas permeability can be reduced. . Further, since a tube made of a material having a high elastic modulus is attached to the round bar portion of the electrode lead-out means, airtightness can be improved. Further, since it is not necessary to cover the capacitor element with the resin layer as in the related art, the manufacturing process of the capacitor is greatly simplified. Furthermore, since the round bar portion of the electrode lead means is fixed to the through hole formed in the sealing plate made of a hard material through a tube made of a material having a high elastic modulus,
Even if a lateral force is applied to the electrode lead-out means, the force can be prevented from being transmitted to the electrode foil. As a result, damage to the electrode foil is reduced, so that an increase in leakage current can be prevented.

According to a second aspect of the present invention, there is provided a capacitor element in which a bipolar electrode foil to which an electrode lead-out means is connected is wound via a separator, and a solid electrolyte layer is formed between the bipolar electrode foils. A bottomed cylindrical outer case for storing the outer case, and sealing means attached to the opening of the outer case, wherein the electrode lead-out means, a flat plate part for internal connection, a round bar part for sealing means penetrating and The solid electrolytic capacitor, comprising an external connection portion, wherein the electrode lead-out means is drawn out of the outer case through a through-hole provided in the sealing means, wherein an elastic modulus is provided in the through-hole provided in the sealing means. A tube made of a material having a high electrode height is mounted, and a round bar portion of the electrode lead-out means is inserted into the tube.

According to the solid electrolytic capacitor of the present invention having the above-described structure, a tube made of a material having a high elastic modulus is previously mounted on the inner surface of the through hole provided in the sealing means. Since the electrode lead-out means is inserted into the inside and the round bar portion of the electrode lead-out means is joined to the tube, the airtightness between the sealing means and the electrode lead-out means can be improved by the tube. Further, similarly to the first aspect of the present invention, since it is not necessary to cover the capacitor element with the resin layer as in the related art, the manufacturing process of the capacitor is greatly simplified. Furthermore, since the round bar portion of the electrode lead-out means is firmly fixed to the through hole formed in the sealing plate made of a hard material, even if a lateral force is applied to the electrode lead-out means, the force is applied to the electrode foil. Can be prevented from being transmitted. As a result, damage to the electrode foil is reduced, so that an increase in leakage current can be prevented.

According to a third aspect of the present invention, there is provided a capacitor element in which a bipolar electrode foil to which an electrode lead-out means is connected is wound via a separator to form a solid electrolyte layer between the bipolar electrode foils, and the capacitor element is housed. A bottomed cylindrical outer case, and sealing means attached to an opening of the outer case, wherein the electrode lead-out means is a flat plate for internal connection, a round bar for penetrating the sealing means, and an external connection. In the solid electrolytic capacitor in which the electrode lead-out means is drawn out of the outer case through a through-hole provided in the sealing means, an inner surface of the through-hole provided in the sealing means on the electrode lead-out side is formed. A step portion protruding inward is formed, a tube made of a material having a high elastic modulus is mounted in the through hole, and a round bar portion of the electrode lead-out means is inserted into the tube. It is characterized in that the.

According to the solid electrolytic capacitor of the third aspect having the above configuration, in addition to the functions and effects of the second aspect, the solid electrolytic capacitor protrudes inward from the inner surface of the through hole on the electrode lead-out side. Since the stepped portion is formed, even if the tube is pressed when the electrode lead-out means is inserted, the tube is locked by the stepped portion and does not fall out of the through hole.

In the solid electrolytic capacitor according to the fourth to sixth aspects, the relative dimensional relationship between the round bar portion of the electrode lead-out means and the through holes formed in the tube and the sealing means is specifically limited. Things. A solid electrolytic capacitor according to a fourth aspect is the solid electrolytic capacitor according to any one of the first to third aspects, wherein the inner diameter of the tube is smaller than the outer diameter of the round bar portion of the electrode lead-out means. Is what you do. According to this configuration, the inner peripheral surface of the tube and the outer peripheral surface of the round bar portion of the electrode lead-out means can be securely brought into close contact with each other over the entire contact region, so that the airtightness of this portion is further improved. be able to.

The solid electrolytic capacitor according to claim 5 is
The solid electrolytic capacitor according to any one of claims 1 to 4, wherein in a state where the tube is mounted on the round bar portion of the electrode lead-out means, the outer diameter of the tube is larger than the diameter of the through hole. It is a feature. According to this configuration, when the round bar portion of the electrode lead-out means is inserted into the tube mounted in the through-hole, the outer peripheral surface of the tube and the inner peripheral surface of the through-hole are reliably formed over the entire contact area. The airtightness of this portion can be further improved.

The solid electrolytic capacitor according to claim 6 is
The solid electrolytic capacitor according to any one of claims 1 to 5, wherein a diameter of an opening end of the through-hole on the insertion side of the electrode lead-out means is larger than a diameter of a center part thereof. It is characterized by being large. According to this configuration, since the through hole formed in the closing means is expanded toward the opening end on the insertion side of the electrode drawing means, the tube can be easily inserted into the through hole, and at least the central portion of the through hole can be inserted. Thus, the outer peripheral surface of the tube and the inner peripheral surface of the through hole can be securely brought into close contact with each other, and the airtightness of this portion can be further improved.

The solid electrolytic capacitor according to claim 7 is
The solid electrolytic capacitor according to any one of claims 1 to 6, wherein the sealing means includes a first sealing member made of a hard material, and a second sealing member made of a flexible material attached to an outer periphery thereof. And a sealing member. According to this configuration, even when there is a slight variation in the dimensions of the first sealing member, the dimensional error can be absorbed by the elasticity of the second sealing member made of a flexible material disposed on the outer periphery thereof. The outer peripheral surface of the sealing means and the inner peripheral surface of the opening of the outer case can be securely brought into close contact with each other, and the airtightness of this portion can be improved.

In the solid electrolytic capacitors according to the eighth and ninth aspects, the materials used for the tubes and the sealing means are specifically limited. The solid electrolytic capacitor according to claim 8 is the solid electrolytic capacitor according to any one of claims 1 to 7, wherein the material having a high elastic modulus is rubber, a fluororesin, a shrinkable tube, polyethylene, polyester, Polyimide, polyamide, nylon, polyamide imide, silicone resin, silicone rubber,
It is a material selected from poly-4-methylpentene-1 (crystalline polyolefin) and ethylene vinyl alcohol. That is, in the solid electrolytic capacitor according to claims 1 to 7, a material having a high elastic modulus can be appropriately selected. In particular, by using the material described in claim 8, sufficient flexibility of the tube is ensured. The quality can be improved, for example, the airtightness of the part can be improved, and the workability and cost are also excellent.

The solid electrolytic capacitor according to claim 9 is
The solid electrolytic capacitor according to any one of claims 1 to 7, wherein the sealing means is a fluororesin, polyphenylene sulfide, nylon, phenol, epoxy, polysulfone, polyimide, polyamide imide, polyoxybenzylene polyethylene, A group of resin materials including polypropylene, polycarbonate, a group of metal materials including aluminum, tantalum, magnesium, copper, nickel, titanium, or alloys thereof,
It is made of a material selected from hard rubber, ceramic, and glass. That is, in the solid electrolytic capacitor according to claims 1 to 8,
The type of material used for the sealing means can be appropriately selected, but in particular, by using the material according to claim 9,
The quality of the sealing means can be improved, for example, the gas permeability of the sealing means can be sufficiently reduced, and the workability and cost are excellent.

A solid electrolytic capacitor according to a tenth aspect of the present invention is the solid electrolytic capacitor according to any one of the first to ninth aspects, wherein a tip of the outer case opening is brought into contact with the sealing means by drawing. It is characterized by being in contact. That is, in the electrolytic capacitors according to claims 1 to 9, the specific shape of the outer case opening can be appropriately selected. In particular, as described in claim 10, the tip of the outer case opening corresponds to the sealing means. By making contact, the pressing of the sealing means is strengthened, and it is possible to prevent the sealing means from jumping out of the outer case due to thermal stress.

According to a eleventh aspect of the present invention, in the solid electrolytic capacitor according to any one of the first to ninth aspects, the solid electrolyte layer is made of polyethylene dioxythiophene (PEDT). It is assumed that. Since polyethylenedioxythiophene has low moisture resistance, a remarkable effect can be obtained by applying the present invention.

According to a twelfth aspect of the present invention, in the method for manufacturing a solid electrolytic capacitor, first, the bipolar electrode foil connected to the electrode lead-out means is wound via a separator, and a solid electrolyte layer is formed between the bipolar electrode foils. Forming a capacitor element, and assembling the capacitor element in a cylindrical outer case having a bottom. A flat plate portion for internal connection and a round bar portion for penetrating sealing means are provided as the electrode lead-out means. And a method for manufacturing a solid electrolytic capacitor using an electrode lead means comprising an external connection part, wherein the assembling step comprises inserting the electrode lead means into a tube made of a material having a high elastic modulus, thereby forming an outer periphery of the round bar part. The tube mounting step of mounting a tube on the tube and the electrode withdrawing means with the tube obtained in the tube mounting step are harder than the tube. An electrode withdrawing step of inserting the external connection portion into the through-hole of the sealing plate made of the above material, extracting the external connection portion from the through-hole, and fitting a round bar portion with a tube into the through-hole. Things.

According to this method, the solid electrolytic capacitor according to the first aspect can be easily and efficiently manufactured. That is, the operation of inserting a tube made of a material having a high elastic modulus into the through-hole and the operation of inserting the electrode lead-out means into the resulting through-hole with a tube are extremely easy and efficient operations. .

According to a thirteenth aspect of the present invention, in the method for manufacturing a solid electrolytic capacitor, the bipolar electrode foil connected to the electrode lead-out means is wound via a separator, and a solid electrolyte layer is formed between the bipolar electrode foils to form a capacitor element. Device forming step, and an assembly step of sealing the capacitor element in a bottomed cylindrical outer case, as the electrode lead means,
In a method of manufacturing a solid electrolytic capacitor using a flat plate portion for internal connection and an electrode lead means comprising a round bar portion for penetrating a sealing means and an external connection portion, the assembling step includes a through hole provided in the sealing means. A step forming an inwardly protruding step on the inner surface on the electrode lead side of the step, a tube mounting step of mounting a tube made of a material having a high elastic modulus in the through hole, and the tube mounting step. An electrode lead-out means is inserted into the through-hole provided with the tube, the external connection portion is pulled out from the through-hole, and an electrode lead-out step of fitting a round bar portion into the tube is provided. .

According to this method, the solid electrolytic capacitor according to the third aspect can be easily and efficiently manufactured. That is, the operation of inserting a tube made of a material having a high elastic modulus into the through-hole and the operation of inserting the electrode lead-out means into the resulting through-hole with a tube are extremely easy and efficient operations. .

According to a fourteenth aspect of the present invention, in the method of manufacturing a solid electrolytic capacitor, the bipolar electrode foil connected to the electrode lead-out means is wound through a separator, and a solid electrolyte layer is formed between the bipolar electrode foils to form a capacitor element. Device forming step, and an assembly step of sealing the capacitor element in a bottomed cylindrical outer case, as the electrode lead means,
In a method for manufacturing a solid electrolytic capacitor using an electrode connection means comprising a flat plate part for internal connection and a round bar part for sealing means penetration and an external connection part, the assembling step includes: A locking member mounting step of disposing a locking member having an opening having a diameter smaller than the diameter of the through hole; a tube mounting step of mounting a tube made of a material having a high elastic modulus in the through hole; An electrode lead-out means is inserted into a through-hole with a tube formed by the step, and the external connection portion is pulled out from the through-hole, and an electrode lead-out step of fitting a round bar portion into the tube is provided. Things.

According to this method, not only can the solid electrolytic capacitor be manufactured efficiently, but also when the electrode lead-out means is inserted into the through-hole of the sealing body, an opening having a diameter smaller than the diameter of the through-hole is provided. By contacting the locking member such that the through-hole and the opening are concentric, even if the tube is pressed in the insertion direction when the electrode lead-out means is inserted, it is possible to prevent the tube from dropping out of the through-hole.

[0032]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a solid electrolytic capacitor according to the present invention and a method for manufacturing the same (hereinafter, referred to as embodiments) will be specifically described with reference to the drawings. The same members as those of the conventional type shown in FIG. 13 are denoted by the same reference numerals, and description thereof will be omitted.

[1. First Embodiment] [1-1. Configuration] FIG. 1 is a sectional view showing a configuration of a first embodiment of a solid electrolytic capacitor according to the present invention. As shown in FIG. 1, a capacitor element 1 formed by winding a bipolar electrode foil to which a lead terminal (electrode lead-out means) 5 is connected via a separator is housed in a bottomed cylindrical outer case 2 made of aluminum or the like. Have been. In this case, the lead terminal 5
A tube 10 made of a material having a high elastic modulus is mounted on the outer periphery of the round bar portion 5b. The lead terminal 5 with the tube 10 is made of a hard material mounted on the inner periphery of the opening of the outer case 2. It is drawn out through the sealing body 11. That is, the opening of the outer case 2 is sealed by the tube 10 and the sealing body 11, and the tip of the opening abuts on the sealing plate 12 of the sealing body 11 by drawing. Hereinafter, detailed configurations of the lead terminal 5, the tube 10, and the sealing body 11 will be described.

FIG. 2 shows a lead terminal 5 with a tube 10.
(A) is a plan view, (B) is a front view,
(C) is a side view. As shown in FIG. 2, the lead terminal 5 is composed of a flat plate portion 5a for internal connection, a round bar portion 5b for penetrating the sealing body, and an external connection portion 5c. Further, a tube 10 made of a flexible material having a high elastic modulus is attached. In this case, the inner diameter of the tube 10 is smaller than the outer diameter of the round bar 5b.

The flexible material constituting the tube 10 includes rubber, fluorine resin, shrink tube, polyethylene, polyester, polyimide, polyamide, nylon, polyamide imide, silicone resin, silicone rubber,
A material selected from poly-4-methylpentene-1 (crystalline polyolefin) and ethylene vinyl alcohol is used.

FIG. 3 is a view showing the sealing body 11.
(A) is a plan view, (B) is a longitudinal sectional view, and (C) is a bottom view. As shown in FIG. 3, the sealing body 11 has a tubular elastic ring (outer peripheral portion) made of a flexible material on an outer periphery of a sealing plate 12 made of a material harder than the tube 10.
13 is mounted. In this case, the inner diameter of the elastic ring 13 is smaller than the outer diameter of the sealing plate 12. The sealing plate 12 of the sealing body 11 is provided with a pair of through holes 14 for drawing out lead wires.

The hard material constituting the sealing plate 12 is a resin material containing a fluororesin, polyphenylene sulfide, nylon, phenol, epoxy, polysulfone, polyimide, polyamideimide, polyoxybenzylene polyethylene, polypropylene, and polycarbonate. Group, a group of metal materials including aluminum, tantalum, magnesium, copper, nickel, titanium, or alloys thereof, hard rubber, ceramic, glass,
The material selected from the following is used. In this case, when a metal material is used, a resin film or an oxide film made of an epoxy resin, a nylon resin, or the like is formed on the surface of the metal material in order to secure insulation between the lead terminal 5 and the capacitor element 1. Is formed. The flexible material forming the elastic ring 13 includes a tube 10
Materials selected from the above groups listed for are used.

FIG. 4 shows the through hole 1 of the sealing body 11.
FIG. 4 is an explanatory diagram showing a dimensional relationship between a tube 4 and a tube 10. As shown in FIG. 4, the through-hole 14 of the sealing body 11 has a straight portion 14 a having a constant diameter and an insertion portion which is inclined and widens toward an opening end on the side to be an insertion opening of the lead terminal 5. It comprises a guide portion 14b. In this case, diameter D ₁₁ of the linear portion 14a of the through-hole 14 has been smaller than the outer diameter D ₂₁ of the tube 10 in the state mounted on the round bar portion 5b, a maximum diameter dimension of the insertion guide portion 14b D _12, the outer diameter D ₂₁ of the tube 10 in the same state
Has been larger than. Preferably, diameter D ₁₁ of the linear portion 14a of the through hole 14, the outer diameter D ₂₁ of the tube 10 in the state mounted on the round bar portion 5b, 5% to 100% of the wall thickness D ₂₂ of the tube It will be the value after subtraction.

[1-2. Manufacturing Process] The electrolytic capacitor having the above configuration is specifically manufactured by the following procedure. First, the flat plate portions 5a of the pair of lead terminals 5 are connected to each of the bipolar electrode foils, and the bipolar electrode foils are wound through a separator to form the capacitor element 1.

Next, as shown in FIG. 5, for each of the pair of lead terminals 5 protruding from the capacitor element 1, the distal end of the external connection portion 5c is inserted into the tube 10 to connect the lead terminals 5 to each other. After relatively moving the tube 10, the entire external connection portion 5 c is pulled out of the tube 10, and the tube 1 is attached to the outer periphery of the round bar portion 5 b of the lead terminal 5.
0 is attached. Specifically, using an appropriate production machine and a long tube material in reel units, the tube material is continuously supplied at an appropriate speed. Then, a predetermined tube 10 is formed by sequentially cutting to a use size as shown in FIG. 2, and a lead terminal 5 is inserted into the tube 10 to continuously mount the tube 10 (tube mounting step). I do. Similarly, with respect to the sealing body 11, similarly, using a long tube material, the tube material is sequentially cut to the size used to form a predetermined elastic ring 13, and a sealing plate 12 is provided in the elastic ring 13. Is inserted, the mounting operation of the elastic ring 13 (second tube mounting step) is continuously performed, and the sealing body 11 is continuously formed.

Subsequently, as shown in FIG.
Inserted lead terminal 5 into through-hole 14 of sealing body 11 to move relative between lead terminal 5 and through-hole 14, then pull out entire external connection portion 5 c of lead terminal 5 from through-hole 14. Then, the round bar 5b with the tube 10 is fitted into the through hole 14. Thereafter, the capacitor element 1 is housed in the outer case 2, and the outer case 2 is sealed by attaching a sealing body 11 to an opening of the outer case 2. In this case, as shown in FIG. 1, drawing is performed on the opening of the outer case 2, and the end of the opening is brought into contact with the sealing plate 12.

[1-3. Operation and Effect] The operation and effect of the present embodiment as described above are as follows. That is, in the present embodiment, the outer case 2 is sealed with the sealing plate 12 made of a hard material, and the tube made of a material having a high elastic modulus is further provided between the round bar portion 5 b and the through hole 14 of the sealing plate 12. 10, the gas permeability of the sealing portion can be reduced, and the sealing body 11
The airtightness of the lead wire lead-out portion can be improved. As a result, it becomes an exterior means having good hermeticity, and the moisture resistance and the like are kept good.

That is, the tube 10 is connected to the lead terminal 5.
Since it is mounted on the side, when the lead terminal 5 is inserted, it is easily deformed so as to extend in the insertion direction. Then, due to such elongation of the tube 10, stress is diffused, and sufficient adhesion between the tube 10 and the round bar portion 5 b of the lead terminal 5 is obtained. In this case, the tube 10 and the round bar portion 5b
, The inner peripheral surface of the tube 10 and the outer peripheral surface of the round bar portion 5b can be surely brought into close contact with each other over the entire contact area, so that the airtightness of this portion can be improved.

Also, when the tube 10 is inserted into the through hole 14 of the sealing body 11, the tube 10 is similarly easily deformed, and sufficient adhesion between the tube 10 and the through hole 14 is obtained. Since the tube 10 is easily deformed, the tube 10 having an outer diameter larger than the diameter of the through hole 14 can be used as described above. And the inner peripheral surface of the straight portion 14a of the through hole 14 can be securely brought into close contact with the entire surface of the contact region, so that the airtightness of this portion can be improved.

Further, according to the present embodiment, the round bar portion 5b of the electrode drawing means is fixed to the through hole 14 of the sealing plate 11 made of a hard material via the tube 10 made of a material having a high elastic modulus. Will be. This hard material is not elastic and the tube 10 placed between this material and the round bar
Has a high elastic modulus, the round bar portion is firmly fixed by this configuration. Therefore, even if a lateral force is applied to the electrode lead-out means, the round bar portion is firmly fixed to the sealing plate 11, so that this force is extremely suppressed from being transmitted to the electrode foil. As a result, damage to the electrode foil is reduced, so that an increase in leakage current is suppressed.

In addition, the tube 10 according to the present embodiment
Is movable along the insertion direction, so that if the pressure inside the outer case becomes abnormally high due to an internal failure or the like, the pressure pushes the tube 10 to the outside and can function as a safety valve. it can. Therefore,
The safety of the electrolytic capacitor can be improved.

In the present embodiment, since the sealing body 11 is composed of the sealing plate 12 made of a hard material and the elastic ring 13 made of a flexible material, the outer peripheral surface of the sealing body 11 The inner peripheral surface of the opening of the outer case 2 is securely brought into close contact, and the airtightness of this portion is enhanced. As a result, even when there is a slight variation in the dimensions of the sealing member 11, the dimensional error can be absorbed by the elasticity of the elastic ring 13 of the sealing member 11, and sufficient adhesion can be obtained. Can be secured.

Further, in this embodiment, since the tip of the opening of the outer case 2 is in contact with the sealing plate 12, the pressing of the sealing body 11 is firm, and the sealing body 11 is thermally stressed. From the outer case 2 can be suppressed. That is, unlike the present embodiment, when the end of the opening of the outer case 2 is brought into contact with the elastic ring 13 instead of the sealing plate 12, the sealing plate 12
The sealing plate 12 may come off due to thermal stress because the space between the sealing ring 12 and the elastic ring 13 is not bonded. However, as in the present embodiment, the tip of the opening of the outer case 2 is By making contact with the sealing plate 12, it is possible to reliably prevent the sealing plate 12 from coming off.

On the other hand, in the above-described manufacturing process,
The operation of inserting the lead terminal 5 into the tube 10 made of a flexible material, and inserting the resulting lead terminal 5 with a tube into the through hole 14 of the sealing plate 12 of the sealing body 11 made of a hard material. This is a very easy and efficient operation, so that an electrolytic capacitor can be easily and efficiently manufactured. In this case, since the through-hole 14 is provided with the insertion guide portion 14b which extends obliquely toward the opening end on the side to be the insertion opening of the lead terminal 5,
The round bar portion 5b of the lead terminal 5 with the tube 10 can be easily inserted.

In particular, using a suitable production machine and a long tube material in reel units, the tube material is continuously supplied at an appropriate speed, and is sequentially cut into the used dimensions to form a predetermined tube 10. Then, the lead terminal 5 is placed in the tube 10.
Can be inserted, and the mounting operation of the tube 10 can be efficiently performed continuously using a simple existing production machine. In this case, since the tubes need only be supplied in reel units, the production efficiency can be improved from this point as well. Further, since such a tube 10 can be easily and efficiently manufactured by continuous production, it is possible to contribute to improvement of production efficiency also from this point. In addition, since the tubular elastic ring 13 is attached to the outer periphery of the sealing plate 12 for the sealing body 11 as well, the mounting work can be performed efficiently similarly to the tube 10, and the production efficiency can be improved.

[2. Second Embodiment] This embodiment is a modification of the first embodiment.

[2-1. Configuration] FIG. 7 is a sectional view showing a configuration of a second embodiment of the electrolytic capacitor according to the present invention. That is, in the present embodiment, as shown in FIG. 7, the sealing body 20 for sealing the opening of the outer case 2 is formed of a single member, and the through hole 21 for leading out the lead terminal is provided at a predetermined position. Is formed. On the inner surface of the through hole 21 on the lead terminal lead-out side (upper side in the figure), a step portion 22 protruding inward is formed. In addition,
The step portion 22 functions as a locking portion that suppresses the movement of the tube 23, as described later. Further, as the hard material constituting the sealing body 20, the same material as in the first embodiment can be used.

Further, as shown in FIG. 8, a tube 2 made of a material having a high elastic modulus is
The lead terminal 5 is inserted into the tube 23, and the external connection portion 5c of the lead terminal is inserted from the other side.
Is drawn out so that the tube 23 and the round bar portion 5b are in close contact with each other. In this case, the inner surface of the through hole 21 and the tube 23 are not bonded to each other, and when the tube 23 moves inside the through hole 21 when the lead terminal is inserted, the step 22 inhibits the movement of the tube 23. It functions as a locking part. The opening of the outer case 2 is sealed by the tube 23 and the sealing body 20, and the tip of the opening abuts on the sealing body 20 by drawing. Note that the same material as that of the first embodiment can be used as a material forming the tube 23.

In this case, the dimensional relationship between the tube 23, the through hole 21 and the round bar portion 5b is as shown in FIG. 9 in order to enhance the adhesion between the round bar portion 5b and the sealing body 20. That is, assuming that the diameter of the through-hole 21 formed in the sealing body 20 is D ₁ , the diameter of the round bar is D ₂ , and the thickness of the tube is t, these relationships are expressed by the following equations. Incidentally, the following equation, in other words, in a state of mounting the tube 23 into the through hole 21, the inner diameter of the tube 23 which means that smaller than the diameter D ₂ of the round bar portion 5b.

[0055]

D ₁ −D ₂ <t × 2 Further, by making the inner diameter (D ₃ ) of the tube 23 smaller than the diameter of the round bar, the adhesion between the round bar portion 5b and the tube 23 can be further enhanced. However, in this case, the relationship between the diameter of the round bar and the inner diameter of the tube is expressed by the following equation.

[0056]

D ₂ > D ₃ [2-2. Manufacturing Process] The solid electrolytic capacitor having the above configuration is specifically manufactured by the following procedure. First, the flat plate portions 5a of the pair of lead terminals 5 are connected to each of the bipolar electrode foils, and the bipolar electrode foils are wound via a separator to form the capacitor element 1. Next, as shown in FIG. 8, a tube 23 made of a material having a high elastic modulus is attached to the inner periphery of the through hole 21 formed in the sealing body 20. Specifically, using an appropriate production machine and a long tube material in reel units, the tube material is continuously supplied at an appropriate speed. Then, a predetermined tube 23 is formed by sequentially cutting to a use size as shown in FIG. 8, and this tube 23 is continuously mounted on the inner periphery of the through hole 21 formed in the sealing body 20 (tube mounting step). ).

Subsequently, for each of the pair of lead terminals 5 protruding from the capacitor element 1, the distal end of the external connection portion 5c is inserted into the tube 23, and the lead terminal 5 and the tube 23 are relatively moved. After that, the entire external connection portion 5c is pulled out from the inside of the tube 23, and the tube 23 is brought into close contact with the outer periphery of the round bar portion 5b of the lead terminal 5.
Thereafter, the capacitor element 1 integrated with the sealing body 20 is housed in the outer case 2, and the sealing body 20 is attached to the opening of the outer case 2 to seal the outer case 2. In this case, as shown in FIG. 7, drawing is performed on the opening of the outer case 2, and the tip of the opening is brought into contact with the sealing body 20.

[2-3. Operation / Effect] In the solid electrolytic capacitor of the present embodiment having the above configuration,
The following functions and effects are obtained in addition to the functions and effects similar to those of the first embodiment. That is, the tube 23 is mounted on the through-hole 21 side formed in the sealing body 20 in advance,
Since the lead terminal 5 is not adhered to the sealing body 20, the lead terminal 5 is easily deformed so as to extend in the insertion direction when the lead terminal 5 is inserted. As described above, when the lead terminal 5 is inserted, the tube 23 and the sealing body 20 slide by the amount of the tube 23 being compressed in the radial direction, and the tube 23 extends in the length direction.
The volume of 3 does not change. Therefore, the elasticity of the tube 23 is utilized, and the pressing force at the time of inserting the lead terminal 5 is reduced, so that the operation of inserting the lead terminal 5 into the tube 23 becomes easy.

Further, due to the elongation of the tube 23, the stress is diffused and sufficient adhesion between the tube 23 and the round bar portion 5b of the lead terminal 5 is obtained. In this case, the tube 23
The inner peripheral surface of the tube 23 and the outer peripheral surface of the round bar portion 5b can be securely brought into close contact with each other over the entire contact region by the dimensional relationship between the tube 23 and the round bar portion 5b. can do.

Further, since the step portion 22 protruding inward is formed on the inner surface of the through hole 21 on the lead terminal lead-out side, even if the tube 23 is pressed when the lead terminal 5 is inserted, the tube 23 remains Since the tube 23 is locked by the step portion 22, the tube 23 does not fall out of the through hole 21.

[3. Third Embodiment] [3-1. Configuration] FIG. 10 is a sectional view showing a configuration of a third embodiment of the electrolytic capacitor according to the present invention. That is, in the present embodiment, as shown in FIG. 10, the sealing body 20 for sealing the opening of the outer case 2 is formed of a single member, and a through hole 21 for leading a lead terminal is provided at a predetermined position. Is formed. The inner diameter of the through-hole 21 is different from that of the second embodiment, and is equal throughout the length thereof. The other configuration is the same as that of the above-described second embodiment, and the description is omitted.

[3-2. Manufacturing Process] The solid electrolytic capacitor having the above configuration is specifically manufactured by the following procedure. First, the flat plate portions 5a of the pair of lead terminals 5 are connected to each of the bipolar electrode foils, and the bipolar electrode foils are wound via a separator to form the capacitor element 1. Next, as shown in FIG. 11, a tube 2 made of a material having a high elastic modulus is provided around the inner periphery of the through hole 21 formed in the sealing body 20.
3 is attached. In this case, a locking member 32 having an opening 33 whose diameter is smaller than the diameter of the through-hole 21 is provided on the lead terminal lead-out side of the sealing body 20 with the through-hole 21 and the opening 33.
When the tube 23 is pressed in the insertion direction when the lead terminal 5 is inserted,
The tube 23 is prevented from dropping from the through hole 21. Specifically, using a suitable production machine and a long tube material in reel units, the tube material is continuously supplied at an appropriate speed. Then, a predetermined tube 23 is formed by sequentially cutting to a use size as shown in FIG. 11, and this tube 23 is continuously attached to the inner periphery of the through hole 21 formed in the sealing body 20.

Subsequently, for each of the pair of lead terminals 5 protruding from the capacitor element 1, the distal end of the external connection portion 5c is inserted into the tube 23, and the lead terminal 5 and the tube 23 are relatively moved. After that, the entire external connection portion 5c is pulled out from the inside of the tube 23, and the tube 23 is brought into close contact with the outer periphery of the round bar portion 5b of the lead terminal 5.
Thereafter, the locking member 32 disposed on the lead terminal lead-out side of the sealing body 20 is removed, and the capacitor element 1 integrated with the sealing body 20 is stored in the outer case 2, and the opening of the outer case 2 is sealed. The exterior case 2 is sealed by mounting the body 20.

[3-3. Operation / Effect] The operation / effect of the electrolytic capacitor of the present embodiment having the above configuration is as follows. In the present embodiment, the shape of the through hole 21 formed in the sealing body 20 and the tube 2
The only difference between the second embodiment and the second embodiment is that the locking member 32 is used in the process of mounting the third embodiment. Therefore, the operation and effects unique to the third embodiment will be described here.

First, the through-hole 21 formed in the sealing body 20
Is set to be equal in the entire length direction, so that the step of forming the through-hole 21 in the sealing body 20 is simplified as compared with the second embodiment. When the tube 23 is mounted in the through hole 21, the locking member 32 having an opening 33 having a diameter smaller than the diameter of the through hole 21 is provided on the lead terminal lead-out side of the sealing body 20. 3
3 is arranged concentrically, even if the tube 23 is pressed in the insertion direction when the lead terminal 5 is inserted, the movement of the tube 23 is suppressed by the locking member 32, and the tube 23 is moved from the through hole 21. Dropping is prevented.
Further, after the tube 23 is mounted in the through hole 21,
Since the locking member 32 is removed, an electrolytic capacitor having the same shape as the conventional one can be obtained.

[4. Other Embodiments] The present invention is not limited to the above embodiments, and various other embodiments can be implemented within the scope of the present invention. First,
In the above embodiments, the tube 10 and the sealing body 11
Specific materials are listed as the flexible materials constituting the elastic ring 13 of the present invention, but the flexible materials in the present invention are not limited to these, and various other flexible materials may be used. Can be used. Similarly, in each of the above embodiments, specific materials are listed as the hard materials constituting the sealing plate 12 of the sealing body 11, but the hard materials used for the sealing plate 12 in the present invention are not limited to these. Instead, a wide variety of other hard materials can be used.

Further, the specific shape of the through-hole formed in the sealing body can be selected as appropriate. For example, in the first embodiment, the insertion guide portion extending on one side of the sealing body 11 toward the opening end is provided. Although the insertion guides 14b are provided, it is also possible to provide such insertion guide portions 14b on both surfaces of the sealing body 11, respectively. In this case, airtightness between the tube 10 and the through hole 14 can be sufficiently ensured.
Since the lead terminal 5 with the tube 10 can be easily inserted from any surface of the sealing body 11, workability can be improved.

FIG. 12 shows another example of the sealing body 11.
As shown in the figure, the linear section 14a having a constant diameter dimension substantially equal to the outer diameter dimension of the tube 10 when mounted on the round bar section 5b, and a small diameter section 14c provided at the center thereof, etc. Is also conceivable. Also in this case, the airtightness between the tube 10 and the through hole 14 can be sufficiently ensured, and the lead terminal 5 with the tube 10 can be easily inserted from any surface of the sealing body 11. Workability can be improved.

Further, in the present invention, the specific configuration of the sealing means can be freely selected, and in this connection, the specific hermetic structure between the outer case and the sealing means can also be freely selected. is there. Further, specific dimensions, shapes, and materials of the outer case, the electrode lead-out means, and the like can be freely selected.

[0070]

The results of specific life characteristics of the solid electrolytic capacitor according to the present invention will be described below. The solid electrolytic capacitors of the conventional example, the first embodiment and the second embodiment are:
Each prepared as follows, 130 ℃ -1000
A time standing test was performed.

(Conventional example) A capacitor element using PEDT as a solid electrolyte is sealed with an epoxy resin using an acid anhydride-based curing agent, and this is stored in an outer case, and the opening of the outer case is simply formed. Seal with rubber, rated 25V-1
A solid electrolytic capacitor of 5 μF (φ6.3 × 6 L) was prepared.

Example 1 A capacitor element using PEDT as a solid electrolyte was left in a thermostat at 100 ° C. for 20 minutes, dried, and then housed in an outer case without resin sealing. Is sealed with the tube 10 and the sealing body 11 according to the method described in the first embodiment, and the rated 25 V-15 μF (φ6.3 × 6
L) A solid electrolytic capacitor was prepared. In this case, as a material of the tube 10 and the elastic ring 13 of the sealing body 11 in the first embodiment, a fluororesin is used, and as a material of the sealing plate 12 of the sealing body 11, aluminum is used to oxidize the surface. A film was formed.

Example 2 A capacitor element using PEDT as a solid electrolyte was allowed to stand in a thermostat at 100 ° C. for 20 minutes, dried and then housed in an outer case without resin sealing. Is sealed with the tube 23 and the sealing body 20 according to the method described in the second embodiment, and is rated at 25 V-15 μF (φ6.3 × 6).
L) A solid electrolytic capacitor was prepared. In this case, as a material of the tube 23 and the sealing body 20 in the second embodiment, a fluorine resin is used, and the inner surface of the through hole 21 formed in the sealing body 20 and the tube 23 are not bonded.

[Comparative Results] Each of the solid electrolytic capacitors of the conventional example, Example 1 and Example 2 obtained by the above method was subjected to a standing test at 130 ° C. for 1000 hours. Such a result was obtained.

[0075]

[Table 1]

As is clear from Table 1, the initial characteristics showed almost the same results in the conventional example, Example 1 and Example 2. However, when left at 130 ° C. for 1000 hours, in the conventional example, Cap is 5.
The tan δ was reduced to about 84.6% of the initial value. The equivalent series resistance (ESR) is about 2.6 of the initial value.
It increased fourfold.

On the other hand, in Example 1, Ca
Although p decreased by 4.2% from the initial value, tan
δ showed a value almost equal to the initial value, and the ESR increased only to about 1.15 times the initial value. Note that this ES
R was only about 45% of the conventional example. Also in Example 2, although Cap decreased by 4.1% compared to the initial value, tan δ showed a value equal to the initial value, and ES
R increased only about 1.16 times the initial value.
This ESR was only about 44% of the conventional example.

As described above, in the conventional example in which the capacitor element is sealed with the epoxy resin using the acid anhydride curing agent, the ESR after the high-temperature life test is about 2.6 compared to the initial value.
The reason for the quadrupling is considered to be as follows. That is, the epoxy resin using an acid anhydride-based curing agent, which has been conventionally used as an exterior resin for covering the outer periphery of the capacitor element, has a property of absorbing moisture in the curing process, but is impregnated with this resin, before being cured. In the process, since a certain amount of moisture is adsorbed on the capacitor element, even if moisture in the capacitor element is absorbed by this resin during the curing process, moisture still remains in the capacitor element. Therefore, at a temperature of 105 ° C. or less, it is considered that the performance of the oxide film is favorably maintained by the remaining moisture, and the initial characteristics such as the withstand voltage characteristic and the leakage current characteristic are favorably maintained. However, at a high temperature of 105 ° C. or higher, it is considered that the characteristics have deteriorated because the moisture remaining in the capacitor element acts on the hydration deterioration of the oxide film and the decrease in the conductivity of the PEDT.

On the other hand, in Examples 1 and 2 using the exterior means according to the present invention, it is considered that the characteristics can be maintained even when left at 130 ° C. for 1000 hours for the following reasons. That is, in Example 1 and Example 2, the capacitor element having the PEDT layer formed as the electrolyte layer is dried before sealing with a resin. Even after this drying process, water at the crystallization water level remains in the capacitor element. . Therefore, it is considered that the performance of the oxide film is favorably maintained by the remaining water of the crystallization water level, and the initial characteristics such as the withstand voltage characteristic and the leakage current characteristic are favorably maintained. On the other hand, in the high-temperature life test at 130 ° C., even if such moisture remains, the hydration degradation of the oxide film and P
Since the characteristics do not deteriorate due to the decrease in the electrical conductivity of the EDT, it is considered that the characteristics are kept good.

Further, if the sealing property after the capacitor element is stored in the outer case is poor, the capacitor element absorbs moisture,
As in the conventional example, at a high temperature of 105 ° C. or more, it is considered that the moisture remaining in the capacitor element acts on hydration deterioration of the oxide film and the like, so that the characteristics are degraded. However, in Examples 1 and 2, Good results were obtained even when left at 130 ° C. for 1000 hours. This indicates that excellent sealing characteristics can be obtained by employing the configuration of the present invention.

From the above, it is clear that the embodiment according to the present invention has better life characteristics than the conventional example. This means that the tube 1 shown in the first embodiment can be used.
This demonstrates that a solid electrolytic capacitor having stable and long life characteristics can be obtained by the sealing structure according to the present invention using 0 and the sealing body 11 or the tube 23 and the sealing body 20 shown in the second embodiment. It is.

[0082]

As described above, according to the present invention,
By attaching a tube made of a flexible material to the round bar portion of the electrode lead-out means and inserting the round bar portion with a tube into the through hole of the sealing means made of a hard material, a capacitor having a simple and high dimensional accuracy can be obtained. As a result, it is possible to provide an excellent solid electrolytic capacitor having stable high life characteristics and capable of contributing to improvement of production efficiency and reduction of manufacturing cost. Further, it is possible to provide an excellent manufacturing method capable of efficiently manufacturing such an excellent solid electrolytic capacitor at low cost.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a configuration of a solid electrolytic capacitor according to a first embodiment of the present invention.

FIG. 2 is a view showing a lead terminal with a tube in the solid electrolytic capacitor of FIG. 1, (A) is a plan view,
(B) is a front view, (C) is a side view.

3A and 3B are diagrams showing a sealing body in the solid electrolytic capacitor of FIG. 1, wherein FIG. 3A is a plan view, FIG.
(C) is a bottom view.

FIG. 4 is an explanatory diagram showing a dimensional relationship between a through hole of a sealing body and a tube in the solid electrolytic capacitor of FIG. 1;

FIG. 5 is a perspective view showing a tube mounting step in the manufacturing process of the solid electrolytic capacitor of FIG. 1;

FIG. 6 is a longitudinal sectional view showing an electrode lead-out step in the manufacturing process of the solid electrolytic capacitor of FIG. 1;

FIG. 7 is a sectional view showing a configuration of a second embodiment of the solid electrolytic capacitor according to the present invention.

8 is a cross-sectional view showing a state in which a lead terminal is inserted into a through hole in which a tube is mounted in the solid electrolytic capacitor of FIG.

FIG. 9 is an explanatory view showing a dimensional relationship of a through hole, a tube, and a round bar portion of a lead terminal formed in a sealing body in the solid electrolytic capacitor of FIG. 7;

FIG. 10 is a sectional view showing a configuration of a third embodiment of the solid electrolytic capacitor according to the present invention.

11 is a cross-sectional view showing a state in which a lead terminal is inserted into a through-hole in which a tube is mounted in the solid electrolytic capacitor of FIG.

FIG. 12 is a longitudinal sectional view showing an example of another shape of the through hole in the sealing body according to the present invention.

FIG. 13 is a cross-sectional view showing a configuration of a conventional solid electrolytic capacitor.

14A and 14B are diagrams showing lead terminals of the solid electrolytic capacitor, wherein FIG. 14A is a plan view, FIG. 14B is a front view, and FIG. 14C is a side view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Capacitor element 2 ... Outer case 3 ... Epoxy resin layer 4 ... Sealing rubber 5 ... Lead terminal 5a ... Flat plate part 5b ... Round bar part 5c ... External connection part 10, 23 ... Tube 11, 20 ... Sealing body 12 ... Sealing plate DESCRIPTION OF SYMBOLS 13 ... Elastic ring 14, 21 ... Through-hole 14a ... Linear part 14b ... Insertion guide part 14c ... Small diameter part 22 ... Step part 32 ... Locking member 33 ... Small diameter opening part

Claims (14)

[Claims] 1. A capacitor element in which a bipolar electrode foil to which an electrode lead-out means is connected is wound via a separator and a solid electrolyte layer is formed between the bipolar electrode foils, and a bottomed cylindrical housing for accommodating the capacitor element. A case and a sealing means attached to an opening of the outer case, wherein the electrode lead means comprises a flat plate part for internal connection, a round bar part for penetrating the seal means, and an external connection part. In a solid electrolytic capacitor whose means is drawn out of an outer case through a through hole provided in the sealing means, a tube made of a material having a high elastic modulus is attached to an outer periphery of a round bar portion of the electrode drawing means. The sealing means is constituted by a sealing plate made of a material harder than the tube, and the round bar with the tube is inserted into a through hole of the sealing plate. Solid electrolytic capacitor. 2. A capacitor element in which a bipolar electrode foil to which an electrode lead-out means is connected is wound via a separator and a solid electrolyte layer is formed between the bipolar electrode foils, and a bottomed cylindrical housing for accommodating the capacitor element. A case and a sealing means attached to an opening of the outer case, wherein the electrode lead means comprises a flat plate part for internal connection, a round bar part for penetrating the seal means, and an external connection part. In a solid electrolytic capacitor whose means is drawn out of the outer case through a through hole provided in the sealing means, a tube made of a material having a high elastic modulus is mounted in the through hole provided in the sealing means. A solid electrolytic capacitor in which a round bar portion of the electrode lead-out means is inserted into the tube. 3. A capacitor element in which a bipolar electrode foil to which an electrode lead-out means is connected is wound via a separator, and a solid electrolyte layer is formed between the bipolar electrode foils, and a bottomed cylindrical outer casing for accommodating the capacitor element. A case and a sealing means attached to an opening of the outer case, wherein the electrode lead means comprises a flat plate part for internal connection, a round bar part for penetrating the seal means, and an external connection part. A solid electrolytic capacitor whose means is drawn out of the outer case through a through hole provided in the sealing means, wherein a stepped portion protruding inward on an inner surface of the through hole provided in the sealing means on an electrode lead-out side. A tube made of a material having a high elastic modulus is mounted in the through hole, and a round bar portion of the electrode lead-out means is inserted into the tube. Body electrolytic capacitors. 4. The solid electrolytic capacitor according to claim 1, wherein an inner diameter of said tube is smaller than an outer diameter of a round bar portion of said electrode lead-out means. 5. An outer diameter of the tube is larger than a diameter of a through hole provided in the sealing means when the tube is mounted on a round bar portion of the electrode lead means. The solid electrolytic capacitor according to any one of claims 1 to 4. 6. A method according to claim 1, wherein a diameter of an opening end of said through hole on an insertion side of said electrode lead-out means is larger than a diameter of a center part thereof. The solid electrolytic capacitor according to any one of the above. 7. The sealing means according to claim 1, wherein said sealing means is made of a hard material.
The solid electrolytic capacitor according to any one of claims 1 to 6, further comprising a sealing member made of a flexible material mounted on the outer periphery of the sealing member. . 8. The material having a high elastic modulus is rubber, fluororesin, shrink tube, polyethylene, polyester, polyimide, polyamide, nylon, polyamideimide,
The material according to any one of claims 1 to 7, wherein the material is selected from silicon resin, silicone rubber, poly-4-methylpentene-1 (crystalline polyolefin), and ethylene vinyl alcohol. The solid electrolytic capacitor as described. 9. The method according to claim 8, wherein the sealing means is a fluororesin, polyphenylene sulfide, nylon, phenol, epoxy, polysulfone, polyimide, polyamideimide,
Polyoxybenzylene polyethylene, polypropylene,
It is composed of materials selected from a group of resin materials including polycarbonate, a group of metal materials including aluminum, tantalum, magnesium, copper, nickel, titanium, or alloys thereof, hard rubber, ceramic, and glass. The solid electrolytic capacitor according to any one of claims 1 to 8, wherein: 10. The solid electrolytic capacitor according to claim 1, wherein a tip of the outer case opening is in contact with the sealing means by drawing. 11. The solid electrolytic capacitor according to claim 1, wherein the solid electrolyte layer is made of polyethylene dioxythiophene. 12. An element forming step of winding a bipolar electrode foil connected to an electrode lead means through a separator, forming a solid electrolyte layer between the bipolar electrode foils to form a capacitor element, and forming the capacitor element with a bottom. A solid electrolytic process comprising an assembling step of sealing in a cylindrical outer case, and using, as the electrode lead-out means, a flat plate part for internal connection and an electrode lead-out means comprising a round bar part for sealing means penetration and an external connection part; In the method for manufacturing a capacitor, the assembling step includes a step of inserting the electrode lead-out means into a tube made of a material having a high modulus of elasticity, and attaching a tube to an outer periphery of the round bar portion. The electrode extraction means with a tube obtained by the above method is inserted into a through hole of a sealing plate made of a material harder than the tube, and A step of extracting the external connection portion from the electrode and fitting an electrode with a round rod with a tube into the through hole. 13. An element forming step of winding a bipolar electrode foil connected to an electrode lead-out means via a separator and forming a solid electrolyte layer between the bipolar electrode foils to form a capacitor element; A solid electrolytic process comprising an assembling step of sealing in a cylindrical outer case, and using, as the electrode lead-out means, a flat plate part for internal connection and an electrode lead-out means comprising a round bar part for sealing means penetration and an external connection part; In the method for manufacturing a capacitor, the assembling step includes: a step forming step of forming an inwardly projecting step on an inner surface of the through hole provided in the sealing means on the electrode lead-out side; and an elastic modulus in the through hole. A tube mounting step of mounting a tube made of a high material, and inserting the electrode lead-out means into a through hole with a tube formed by the tube mounting step, It is drawn out of the external connecting portion from the through hole of the method for producing a solid electrolytic capacitor characterized by having an electrode lead-out step of fitting the round bar portion within the tube. 14. An element forming step of winding a bipolar electrode foil connected to an electrode lead means through a separator, forming a solid electrolyte layer between the bipolar electrode foils to form a capacitor element, and forming the capacitor element with a bottom. A solid electrolytic process comprising an assembling step of sealing in a cylindrical outer case, and using, as the electrode lead-out means, a flat plate part for internal connection and an electrode lead-out means comprising a round bar part for sealing means penetration and an external connection part; In the method for manufacturing a capacitor, the assembling step includes: a locking member mounting step of disposing a locking member having an opening having a diameter smaller than the diameter of the through hole on the electrode lead-out side of the sealing means; A tube mounting step of mounting a tube made of a material having a high elastic modulus, and an electrode lead-out means in a through hole with a tube formed in the tube mounting step. Input, and it is drawn out the external connection portion from the through hole, a manufacturing method of a solid electrolytic capacitor characterized by having an electrode lead-out step of fitting the round bar portion within the tube.