CN115561543A - Temperature rise test system and method for direct current charging connection assembly of electric automobile - Google Patents

Abstract

The invention discloses a temperature rise test system and method for a DC charging connection component of an electric vehicle. The temperature rise test system comprises: a power supply and a vehicle socket gauge are respectively connected to the input end and the output end of the DC charging connection component to be tested; The contact area between the vehicle socket gauge and the tested DC charging connection component is provided with a heating device and a reference temperature measuring device; a self-temperature measuring device is provided at the tested DC charging connection component; the output current of the charger is simulated through the power supply; through the vehicle socket The gauge simulates the electric vehicle charging socket; the heating device simulates the heat generated by the contact resistance between the measured DC charging connection component and the vehicle socket gauge; the temperature of the measured DC charging connection component is collected through its own temperature measuring device; The temperature of the contact area between the measured DC charging connection component and the vehicle socket gauge; the invention can objectively and accurately measure the temperature sensing performance of the tested DC charging connection component.

Description

A temperature rise test system and method for electric vehicle DC charging connection components

technical field

The invention relates to a temperature rise testing system and method for a DC charging connection component of an electric vehicle, belonging to the technical field of electric vehicles.

Background technique

Electric vehicle charging facilities are an important foundation for the development of electric vehicles, and charging connection components are an important part of charging facilities. The standardization of charging connection components will promote the large-scale development of electric vehicles. During DC charging, the large charging current will cause the connection components to generate a certain amount of heat. In addition, the contact resistance between the vehicle plug and the vehicle socket of the charging connection components will also generate additional heat. The charging connection components need to monitor the temperature through a temperature sensor. And it can sense the abnormal temperature rise, and transmit the temperature data to the charger for protection action to ensure the safety of the charging process.

At present, in IEC TS62196-3-1:2020, the temperature rise test methods of AA, EE, and FF types of charging connection components are specified. The present invention relates to GG type DC charging connection components. There are differences between components and AA, EE, and FF types of charging connection components, so the temperature rise test method specified in IEC 62196-3-1 is not applicable to GG type charging connection components, and it is urgent to improve the temperature sensing of GG type charging connection components performance testing method.

The temperature sensing performance is an important performance index of the charging connection component, which directly reflects the sensing performance of the charging connection component for abnormal temperature rise. The charging connection component with high sensing performance can sense the abnormal temperature rise in time and transmit it to the The protection action of the charger is beneficial to ensure the safe and stable operation of the charging connection components for a long time under high current. The temperature sensing performance test involves the test method, temperature sensor arrangement, heating power, test process, etc. These factors will affect the temperature sensing performance test results of the charging connection component. At present, there is no temperature sensing performance test for the GG type charging connection component. method, so it is urgent to solve this problem.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies in the prior art and provide a temperature rise testing system and method for DC charging connection components of electric vehicles, which can objectively and accurately measure the temperature sensing performance of the DC charging connection components.

In order to achieve the above object, the present invention is achieved by adopting the following technical solutions:

In the first aspect, the present invention provides a temperature rise test system for a DC charging connection component of an electric vehicle, which is provided with a tested DC charging connection component, and a power supply is respectively connected to the input end and the output end of the tested DC charging connection component and a vehicle socket gauge; a heating device and a reference temperature measuring device are provided at the contact area between the vehicle socket gauge and the measured DC charging connection assembly; a self-temperature measuring device is provided at the measured DC charging connection assembly.

Optionally, the tested DC charging connection assembly includes a positive connection unit and a negative connection unit, the positive connection unit includes an electrically connected positive pin and a positive cable, and the negative connection unit includes an electrically connected negative plug pin and a negative cable; the vehicle socket gauge includes a positive jack and a negative jack; the measured DC charging connection assembly is detachably connected to the vehicle socket gauge, and the positive pin and the negative pin are respectively suitable for It is equipped with the positive jack and the negative jack.

Optionally, the power supply is a DC power supply or an AC power supply, the DC power supply includes a positive terminal DC+ and a negative terminal DC-, and the AC power supply includes an output terminal L and an output terminal N;

If the power supply is a DC power supply, the positive terminal DC+ and the negative terminal DC- are respectively connected to the positive cable and the negative cable; or the positive terminal DC+ and the negative terminal DC- are respectively connected to the The negative cable is connected to the positive cable;

If the power supply is an AC power supply, the output terminal L and the output terminal N are respectively connected to the positive cable and the negative cable; or the output terminal L and the output terminal N are respectively connected to the negative cable and the Positive cable connection.

Optionally, the positive socket is electrically connected to the negative socket.

Optionally, the temperature rise test system further includes a heating control module, and the heating device is connected to the heating control module.

Optionally, the heating device includes a positive heating module and a negative heating module, the positive heating module is arranged in the contact area between the positive pin and the positive socket, and the negative heating module is arranged in the negative socket. In the contact area between the needle and the negative pole socket, both the positive pole heating module and the negative pole heating module are connected to the heating control module.

Optionally, the temperature rise testing system further includes a temperature patrol instrument, and the reference temperature measuring device and the self temperature measuring device are respectively connected to the temperature patrol instrument.

Optionally, the reference temperature measuring device includes a positive reference temperature sensor and a negative reference temperature sensor, the positive reference temperature sensor is arranged in the contact area between the positive pin and the positive socket, and the negative reference temperature sensor The positive electrode reference temperature sensor and the negative electrode reference temperature sensor are respectively connected to the temperature patrol instrument.

Optionally, the self-temperature measuring device includes a positive self-temperature sensor and a negative self-temperature sensor, and the positive self-temperature sensor and the negative self-temperature sensor are respectively arranged at the positive connection unit and the negative connection unit, The self-temperature sensor of the positive electrode and the self-temperature sensor of the negative electrode are respectively connected to the temperature patrol instrument.

In a second aspect, the present invention provides a temperature rise test method based on the above temperature rise test system, comprising:

Obtain the rated current and test current of the DC charging connection component under test;

Obtain the test heating power of the heating device according to the rated current and the test current;

Start the power supply and the heating device respectively based on the test current and the test heating power;

When the power supply and the heating device are activated for a preset period of time, they will be turned off;

Use its own temperature measuring device to collect the temperature value of the measured DC charging connection component during the process of starting and closing the power supply and heating device;

The temperature change rate of the measured DC charging connection component is calculated based on the temperature value at the measured DC charging connection component when the power supply and the heating device are turned on and off.

Optionally, said obtaining the test heating power of the heating device according to the rated current and the test current includes:

Start the power supply based on the rated current;

After the power supply is started, the temperature value of the contact area between the vehicle socket gauge and the measured DC charging connection component is collected through the reference temperature measuring device;

When the temperature value of the contact area between the vehicle socket gauge and the tested DC charging connection component is stable, start the heating device;

Adjust the real-time heating power of the heating device, so that the temperature value of the contact area between the vehicle socket gauge and the measured DC charging connection component is stable at the preset temperature, and record and adjust the current heating power of the heating device;

Calculate the failure resistance critical value of the contact area between the vehicle socket gauge and the tested DC charging connection component according to the current heating power and rated current:

In the formula, P _Hrated is the current heating power of the heating device, I _rated is the rated current, and ΔR _failure is the critical value of failure resistance;

Calculate the test heating power according to the test current and the failure resistance critical value of the contact area between the vehicle socket gauge and the tested DC charging connection component:

In the formula, P _Htest is the test heating power, and I _test is the test current.

Optionally, the temperature rise test method further includes obtaining the temperature change rate limit of the tested DC charging connection component, and if the temperature change rate of the tested DC charging connection component is greater than the temperature change rate limit, then it is determined that the tested DC charging Connected components pass the temperature rise test.

Optionally, the rated current of the tested DC charging connection component is greater than the test current.

Compared with the prior art, the beneficial effects achieved by the present invention are as follows:

The present invention provides a temperature rise test system and method for a DC charging connection component of an electric vehicle. The temperature rise test system: simulates the output current of a charger through a power supply; simulates the charging socket of an electric vehicle through a vehicle socket gauge; Measure the heat generated by the increased contact resistance between the DC charging connection component and the vehicle socket gauge; collect the temperature of the measured DC charging connection component through its own temperature measurement device; collect the contact area between the measured DC charging connection component and the vehicle socket gauge through the reference temperature measurement device The temperature; its temperature rise test method: obtain the test heating power P test of the heating device through the test current I _test and the rated current I _rated , control the heating device through the _{test heating power P test and} then obtain the temperature change rate k, and charge it through the tested DC The temperature change rate k of the connected components is compared with the temperature change rate limit K to determine whether the test is passed;

In summary, the present invention can objectively and accurately measure the temperature sensing performance of the DC charging connection component, overcome the influence of human factors, and the test results are more scientific and can accurately reflect the rationality of the temperature sensor arrangement of the charging connection component and the fault response capability. The invention can provide testing technical means and technical support for the safe application of charging connection components.

Description of drawings

FIG. 1 is a schematic structural diagram of a temperature rise test system for an electric vehicle DC charging connection assembly provided in Embodiment 1 of the present invention;

Fig. 2 is a flow chart of the temperature rise test method based on the temperature rise test system in the first embodiment provided by the second embodiment of the present invention;

Fig. 3 is a flow chart of a method for obtaining the test heating power of the heating device provided by Embodiment 2 of the present invention;

Labeled in the figure:

1. Tested DC charging connection assembly, 11. Positive connection unit, 12. Positive cable, 13. Positive pin, 14. Negative connection unit, 15. Negative pin, 16. Negative cable, 2. Power supply, 3. Vehicle socket gauge, 31, positive jack, 32, negative jack, 33, cable, 4, heating device, 41, positive heating module, 42, negative heating module, 43, heating control module, 5, reference temperature measuring device, 51. Positive reference temperature sensor, 52. Negative reference temperature sensor, 6. Self-temperature measuring device, 61. Positive self-temperature sensor, 62. Negative self-temperature sensor, 7. Temperature inspection instrument, 8. Heat exchange device.

detailed description

The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

Embodiment one:

The present invention provides a temperature rise test system for a DC charging connection component of an electric vehicle, which is provided with a DC charging connection component 1 to be tested, and a power supply 2 and a vehicle socket are respectively connected to the input end and the output end of the DC charging connection component 1 under test. Gauge 3; a heating device 4 and a reference temperature measuring device 5 are provided in the contact area between the vehicle socket gauge 3 and the tested DC charging connection assembly 2; a self-temperature measuring device 6 is provided at the tested DC charging connection assembly 1.

Among them, the power supply 2 is used to simulate the output current of the charger; the vehicle socket gauge 3 is used to simulate the electric vehicle charging socket; Gauge 3) The heat generated by the increased contact impedance; the self-temperature measuring device 5 is used to collect the temperature of the measured DC charging connection assembly 1; the reference temperature measuring device 6 is used to collect the contact between the measured DC charging connection assembly 1 and the vehicle socket gauge 3 zone temperature.

specific,

(1) The tested DC charging connection assembly 1 includes a positive connection unit 11 and a negative connection unit 14. The positive connection unit 11 includes an electrically connected positive pin 13 and a positive cable 12, and the negative connection unit 14 includes an electrically connected negative plug. pin 15 and negative cable 16; the vehicle socket gauge 3 includes a positive pole jack 31 and a negative pole jack 32; the measured DC charging connection assembly 1 is detachably connected to the vehicle socket gauge 3, and the positive pole pin 12 and the negative pole pin 15 are adapted respectively The electrical connection between the positive pole socket 31 and the negative pole socket 32 ; the positive pole socket 31 and the negative pole socket 32 can be implemented through a cable 33 or a copper bar as a connecting piece.

(2) The power supply 2 is a DC power supply or an AC power supply. The DC power supply includes a positive terminal DC+ and a negative terminal DC-, and the AC power supply includes an output terminal L and an output terminal N;

If the power supply 2 is a DC power supply, the positive terminal DC+ and the negative terminal DC- are respectively connected to the positive cable 12 and the negative cable 16; or the positive terminal DC+ and the negative terminal DC- are respectively connected to the negative cable 16 and the positive cable 12;

If the power supply 2 is an AC power supply, the output terminals L and N are connected to the positive cable 12 and the negative cable 16 respectively; or the output terminals L and N are connected to the negative cable 16 and the positive cable 12 respectively.

Because in the vehicle socket gauge 3, the positive pole jack 31 and the negative pole jack 32 are electrically connected by a cable 33 or a copper row, so there is no need to distinguish the positive and negative poles during the test, and the connection mode of the power supply 2 is relatively free.

(3) The temperature rise test system further includes a heating control module 43 , and the heating device 4 is connected to the heating control module 43 . The heating device 4 includes a positive electrode heating module 41 and a negative electrode heating module 42. The positive electrode heating module 41 is arranged in the contact area between the positive electrode pin 12 and the positive electrode socket 31, and the negative electrode heating module 42 is arranged in the contact area between the negative electrode pin 15 and the negative electrode socket 32. zone, the positive electrode heating module 41 and the negative electrode heating module 42 are all connected to the heating control module 43 . Wherein, the heating control module 43 is used for controlling the heating power of the heating device.

(4) The temperature rise test system also includes a temperature inspection instrument 7 , and the reference temperature measuring device 5 and the self temperature measuring device 6 are respectively connected to the temperature inspection instrument 7 .

The reference temperature measuring device 5 includes a positive reference temperature sensor 51 and a negative reference temperature sensor 52. The positive reference temperature sensor 51 is arranged on the contact area between the positive pin 12 and the positive socket 31, and the negative reference temperature sensor 52 is arranged on the negative pin 15 and the positive socket 31. The contact area of the negative pole socket 32 , the positive pole reference temperature sensor 51 and the negative pole reference temperature sensor 52 are respectively connected to the temperature patrol instrument 7 .

The self-temperature measuring device 6 includes a positive self-temperature sensor 61 and a negative self-temperature sensor 62. The positive self-temperature sensor 61 and the negative self-temperature sensor 62 are respectively arranged at the positive connection unit 11 and the negative connection unit 14. The positive self-temperature sensor 61 and the negative The self-temperature sensors 62 are respectively connected to the temperature inspection instrument 7, and the temperature inspection instrument 7 is used to display and store the collected temperature in real time.

Embodiment two:

As shown in Figure 2, an embodiment of the present invention provides a temperature rise test method based on the temperature rise test system in Embodiment 1, including the following steps:

1. Obtain the rated current I _rated and the test current I test of the DC charging connection component 1 under _test ; the rated current I _rated and the test current I _test can be obtained from the manufacturer. The rated current I _rated of the tested DC charging connection assembly 1 is greater than the test current I _test .

2. Obtain the test heating power P _Htest of the heating device 4 according to the rated current I _rated and the test current I _test ;

As shown in Figure 3, the method for obtaining the test heating power P _Htest in this embodiment is as follows:

2.1. Start the power supply 2 based on the rated current I _rated ;

2.2. After the power supply 2 is started, the temperature value of the contact area between the vehicle socket gauge 3 and the measured DC charging connection component 1 is collected through the reference temperature measuring device 5;

2.3. When the temperature value of the contact area between the vehicle socket gauge 3 and the measured DC charging connection component 1 is stable, start the heating device 4;

2.4. By adjusting the real-time heating power of the heating device 4, the temperature value of the contact area between the vehicle socket gauge 3 and the measured DC charging connection component 1 is stabilized at the preset temperature (generally 90°C), and the current temperature of the heating device 4 is recorded. Heating power P _Hrated ;

2.5. According to the current heating power P _Hrated and the rated current I _rated , calculate the failure resistance critical value ΔR _failure of the contact area between the vehicle socket gauge 3 and the tested DC charging connection component 1:

In the formula, P _rated is the current heating power of the heating device, I _rated is the rated current, and ΔR _failure is the critical value of failure resistance;

2.6. Calculate the test heating power according to the test current I _test and the failure resistance critical value of the contact area between the vehicle socket gauge 3 and the tested DC charging connection component 1:

In the formula, P _Htest is the test heating power, and I _test is the test current.

3. Start the power supply 2 and the heating device 4 respectively based on the test current _Itest and the test heating power P _Htest ;

4. When the power supply 2 and the heating device 4 are turned on and reach the preset time t, they are turned off;

5. Collect the temperature values (T _S0 , T _St ) at the measured DC charging connection component 1 when the power supply 2 and the heating device 4 are started and shut down through their own temperature measuring device 6;

6. Calculate the temperature change rate of the measured DC charging connection component 1 based on the temperature value at the measured DC charging connection component 1 when the power supply 2 and the heating device 4 are turned on and off;

Temperature change rate k:

In the formula, T _S0 and T _St are the starting point and ending point of the preset duration t (that is, when the power supply 2 and the heating device 4 are turned on and off), and the temperature value at the measured DC charging connection component 1 .

7. Obtain the temperature change rate limit K of the tested DC charging connection component 1 (can be obtained from the manufacturer), if the temperature change rate of the tested DC charging connection component 1 is greater than the temperature change rate limit (k<K), Then it is determined that the tested DC charging connection assembly 1 has passed the temperature rise test.

In addition, because the tested DC charging connection assembly 1 currently provided by some manufacturers can be equipped with an additional heat exchange device 8, so that the temperature of the tested DC charging connection assembly 1 is reduced when it is working. In order to adapt to the tested DC charging connection assembly 1 with the heat exchange device 8, for the above method, in step 2.1, start the power supply 2 based on the rated current I _rated , start the heat exchange device 8, and turn the power of the heat exchange device 8 Set to the maximum, so that the influence of the heat exchange device 8 on the temperature of the tested DC charging connection assembly 1 is taken into account.

This method can objectively and accurately measure the temperature sensing performance of DC charging connection components, and the test results can more scientifically reflect the rationality of the temperature sensor arrangement of the charging connection components and the fault response capability, and can provide professional testing institutions or charging connection device manufacturers Effective detection means and tools.

Those skilled in the art should understand that the embodiments of the present application may be provided as methods, systems, or computer program products. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.

The above is only a preferred embodiment of the present invention, it should be pointed out that for those of ordinary skill in the art, without departing from the technical principle of the present invention, some improvements and modifications can also be made. It should also be regarded as the protection scope of the present invention.

Claims (13)

1. A temperature rise test system of an electric vehicle DC charging connection assembly, which is provided with a measured DC charging connection assembly, characterized in that the input and output ends of the measured DC charging connection assembly are respectively connected with a power supply and a vehicle A socket gauge; a heating device and a reference temperature measuring device are provided at the contact area between the vehicle socket gauge and the tested DC charging connection assembly; a self-temperature measuring device is provided at the tested DC charging connection assembly. 2. A temperature rise test system for an electric vehicle DC charging connection assembly according to claim 1, wherein the tested DC charging connection assembly includes a positive connection unit and a negative connection unit, and the positive connection unit includes Electrically connected positive pins and positive cables, the negative connection unit includes electrically connected negative pins and negative cables; the vehicle socket gauge includes a positive jack and a negative jack; the tested DC charging connection assembly It is detachably connected with the vehicle socket gauge, and the positive pin and the negative pin are respectively adapted to the positive jack and the negative jack. 3. The temperature rise test system of a DC charging connection assembly for an electric vehicle according to claim 2, wherein the power supply is a DC power supply or an AC power supply, and the DC power supply includes a positive terminal DC+ and a negative terminal DC -, the AC power supply includes an output terminal L and an output terminal N; If the power supply is a DC power supply, the positive terminal DC+ and the negative terminal DC- are respectively connected to the positive cable and the negative cable; or the positive terminal DC+ and the negative terminal DC- are respectively connected to the The negative cable is connected to the positive cable; If the power supply is an AC power supply, the output terminal L and the output terminal N are respectively connected to the positive cable and the negative cable; or the output terminal L and the output terminal N are respectively connected to the negative cable and the Positive cable connection. 4 . The temperature rise test system of an electric vehicle DC charging connection assembly according to claim 2 , wherein the positive pole jack is electrically connected to the negative pole jack. 5 . 5. A temperature rise test system for an electric vehicle DC charging connection assembly according to claim 2, wherein the temperature rise test system further comprises a heating control module, and the heating device is connected to the heating control module . 6. A temperature rise test system for an electric vehicle DC charging connection assembly according to claim 5, wherein the heating device includes a positive electrode heating module and a negative electrode heating module, and the positive electrode heating module is arranged on the positive electrode The contact area between the pin and the positive socket, the negative heating module is arranged in the contact area between the negative pin and the negative socket, and both the positive heating module and the negative heating module are connected to the Heating control module. 7. The temperature rise test system of a DC charging connection assembly for an electric vehicle according to claim 2, wherein the temperature rise test system further comprises a temperature inspection instrument, the reference temperature measuring device and the self The temperature measuring devices are respectively connected to the temperature inspection instrument. 8. A temperature rise test system for an electric vehicle DC charging connection assembly according to claim 7, wherein the reference temperature measuring device includes a positive reference temperature sensor and a negative reference temperature sensor, and the positive reference temperature sensor Set in the contact area between the positive pin and the positive socket, the negative reference temperature sensor is set in the contact area between the negative pin and the negative socket, the positive reference temperature sensor and the negative The reference temperature sensors are respectively connected to the temperature patrol instruments. 9. The temperature rise test system of a DC charging connection assembly for an electric vehicle according to claim 7, wherein the self-temperature measuring device includes a positive self-temperature sensor and a negative self-temperature sensor, and the positive self-temperature sensor The positive electrode self-temperature sensor and the negative electrode self-temperature sensor are respectively arranged at the positive electrode connection unit and the negative electrode connection unit, and the positive electrode self-temperature sensor and the negative electrode self-temperature sensor are respectively connected to the temperature patrol instrument. 10. A temperature rise test method based on the temperature rise test system according to any one of claims 1-9, characterized in that, comprising: Obtain the rated current and test current of the DC charging connection component under test; Obtain the test heating power of the heating device according to the rated current and the test current; Start the power supply and the heating device respectively based on the test current and the test heating power; When the power supply and the heating device are activated for a preset period of time, they will be turned off; Use its own temperature measuring device to collect the temperature value of the measured DC charging connection component during the process of starting and closing the power supply and heating device; The temperature change rate of the measured DC charging connection component is calculated based on the temperature value at the measured DC charging connection component when the power supply and the heating device are turned on and off. 11. The temperature rise test method of the temperature rise test system according to claim 10, wherein said obtaining the test heating power of the heating device according to the rated current and the test current comprises: Start the power supply based on the rated current; After the power supply is started, the temperature value of the contact area between the vehicle socket gauge and the measured DC charging connection component is collected through the reference temperature measuring device; When the temperature value of the contact area between the vehicle socket gauge and the tested DC charging connection component is stable, start the heating device; Adjust the real-time heating power of the heating device, so that the temperature value of the contact area between the vehicle socket gauge and the measured DC charging connection component is stable at the preset temperature, and record and adjust the current heating power of the heating device; Calculate the failure resistance critical value of the contact area between the vehicle socket gauge and the tested DC charging connection component according to the current heating power and rated current:

In the formula, P _Hrated is the current heating power of the heating device, I _rated is the rated current, and ΔR _failure is the critical value of failure resistance; Calculate the test heating power according to the test current and the failure resistance critical value of the contact area between the vehicle socket gauge and the tested DC charging connection component:

In the formula, P _Htest is the test heating power, and I _test is the test current. 12. The temperature rise test method of the temperature rise test system according to claim 10, characterized in that the temperature rise test method further comprises obtaining the temperature change rate limit of the tested DC charging connection component, if the measured DC charging If the temperature change rate of the connection component is greater than the temperature change rate limit, it is determined that the tested DC charging connection component has passed the temperature rise test. 13. The temperature rise test method of the temperature rise test system according to claim 10, characterized in that the rated current of the tested DC charging connection component is greater than the test current.

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