CN218568952U - Double-battery device - Google Patents

Abstract

The utility model discloses a double cell device, include: the battery management system comprises a first battery module, a second battery module, a battery interface, a regulating resistor and a regulating switch, wherein the first battery module comprises a first battery management system, a first battery and a first relay switch group, and the first relay switch group is connected with the positive electrode and the negative electrode of the first battery; the second battery module comprises a second battery management system, a second battery and a second relay switch group, and the second relay switch group is connected with the anode and the cathode of the second battery; the battery interface is respectively connected with a first battery and a second battery, the first battery is connected with the battery interface through a first relay switch group, the second battery is connected with the battery interface through a second relay switch group, and the battery interface further comprises a discharging interface, a direct-current charging interface and an alternating-current charging interface; the first end of the adjusting resistor is connected with the first relay switch group, and the second end of the adjusting resistor is connected with the battery interface; the adjusting switch is connected with the adjusting resistor in parallel.

Description

A dual battery device

technical field

The utility model relates to the technical field of a vehicle-mounted dual-battery system, in particular to a dual-battery device.

Background technique

Currently, the dual battery system aims to develop a battery system that satisfies fast charging and high battery life at the same time. The dual-battery system includes two types of batteries, among them: the first battery has high energy and high energy density, but its charging capacity is weak, and it is mainly used for mileage replenishment; the second battery has no advantage in energy but has a strong charging capacity, and can quickly Charge a certain amount of electricity for short-distance use and quick energy replenishment. It can not only meet the needs of fast charging and replenishment of electric vehicles, but also meet the needs of long cruising range of electric vehicles, and at the same time improve the overall driving life of the system.

Utility model content

In order to solve at least one aspect of the above problems, the utility model provides a dual-battery device, including: a first battery module, the first battery module includes a first battery management system, a first battery and a first relay switch group , the first battery relay group is connected to the positive and negative poles of the first battery, the first battery management system is electrically connected to the first relay switch group; the second battery module, the second battery module includes a second battery management system system, a second battery, and a second relay switch group, the second relay switch group is connected to the positive and negative poles of the second battery, and the second battery management system is electrically connected to the second relay switch group; the battery interface, the The first battery and the second battery are connected in parallel at one end of the battery interface, the first battery is connected to the battery interface through the first relay switch group, and the second battery is connected to the battery interface through the second relay switch connected to the battery interface, the battery interface also includes a discharge interface, a DC charging interface and an AC charging interface; an adjustment resistor, the first end of the adjustment resistor is connected to the first relay switch group, and the first end of the adjustment resistor is connected to the first relay switch group. The second end is connected to the battery interface; an adjustment switch, the adjustment switch is connected in parallel with the adjustment resistor.

Preferably, the positive and negative poles of the DC charging interface are respectively provided with a third switch group, the third switch group is used to control the connection or disconnection of the battery interface and the DC power supply, and the third switch group switch Use relay switch.

Preferably, the first battery module further includes a plurality of first cells and a plurality of first cell controllers, the plurality of first cell controllers are used to balance the plurality of first cells, the Multiple first cell controllers are connected to the first battery management system.

Preferably, the second battery module further includes a plurality of second cells and a plurality of second cell controllers, the plurality of second cell controllers are used to balance the plurality of second cells, the Multiple second cell controllers are connected to the second battery management system.

Preferably, a fuse is further included, and the negative terminal of the battery interface is electrically connected to the first battery and the second battery through the fuse.

Preferably, it also includes a first current sensor and a second current sensor, the second battery is sequentially connected to the fuse through the first current sensor and the second current sensor connected in series, and the first battery is connected to the fuse through the A first current sensor is connected to the fuse.

Preferably, the regulating switch adopts a relay switch.

The dual-battery device of the present invention has the following beneficial effects: in the dual-battery system, there is the possibility of selecting different cell systems, so the algorithms for SOC calculation will be different, the historical data of the battery will be stored in the BMC controller, and each battery uses A separate BMC controller can more conveniently replace one of the batteries when there is an after-sales problem. In the parallel connection stage of the double battery terminals, due to the voltage difference between the batteries, one battery pack may charge the other battery pack, and the current in this process is uncontrollable, so an adjustment resistor is connected in series in the loop for Limit the current in parallel to a safe and small range, thereby reducing current sampling errors and eliminating safety risks. The regulating resistor is connected in the loop by opening and closing the regulating switch.

Description of drawings

In order to better understand the above and other objects, features, advantages and functions of the present invention, reference may be made to the embodiments shown in the accompanying drawings. Like reference numerals refer to like parts in the figures. Those skilled in the art should understand that the accompanying drawings are intended to schematically illustrate preferred embodiments of the present utility model, and are not intended to limit the scope of the present utility model, and each component in the figure is not drawn to scale.

Fig. 1 shows a schematic structural diagram of a dual-battery device according to an embodiment of the present invention.

Detailed ways

Exemplary embodiments of the present disclosure are described below in conjunction with the accompanying drawings, which include various details of the embodiments of the present disclosure to facilitate understanding, and they should be regarded as exemplary only. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope and spirit of the disclosure. Also, descriptions of well-known functions and constructions are omitted in the following description for clarity and conciseness.

As used herein, the term "comprise" and its variants mean open inclusion, ie "including but not limited to". The term "or" means "and/or" unless otherwise stated. The term "based on" means "based at least in part on". The terms "one example embodiment" and "one embodiment" mean "at least one example embodiment." The term "another embodiment" means "at least one further embodiment". The terms "first", "second", etc. may refer to different or the same object. Other definitions, both express and implied, may also be included below.

In order to at least partially solve one or more of the above-mentioned problems and other potential problems, an embodiment of the present disclosure proposes a dual-battery device, including: a first battery module, a second battery module, a battery interface, an adjustment resistor F And the adjustment switch KF, the first battery module includes the first battery management system BMC-A, the first battery EA and the first relay switch group KA1/KA2, the first battery relay group KA1/KA2 is connected to the positive and negative terminals of the first battery EA Pole, the first battery management system BMC-A is electrically connected to the first relay switch group KA1/KA2; the second battery module includes the second battery management system BMC-B, the second battery EB and the second relay switch group KB1/KB2, The second relay switch group KB1/KB2 is connected to the positive and negative poles of the second battery, and the second battery management system BMC-B is electrically connected to the second relay switch group KB1/KB2; the first battery EA and the second battery EB are connected in parallel to the battery At one end of the interface, the first battery EA is connected to the battery interface through the first relay switch group KA1/KA2, and the second battery EB is connected to the battery interface through the second relay switch group KB1/KB2. The battery interface also includes a discharge interface and a DC charging interface. and the AC charging interface; the first end of the adjusting resistor F is connected to the first relay switch group, and the second end of the adjusting resistor F is connected to the battery interface; the adjusting switch KF and the adjusting resistor F are connected in parallel.

Specifically, as shown in Figure 1, the positive and negative poles of the battery interface are respectively connected to the first battery EA and the second battery EB through the HV+ and HV- lines, and the positive and negative poles of the battery interface also include terminals for connecting to the vehicle-mounted electric device. Discharge interface, such as adaptive cruise control system ACC, vehicle heater PTC, engine Motor, etc. The positive and negative poles of the battery interface also include the DC charging interface DC for connecting to the DC charging power supply, and the AC charging interface for connecting to the AC charging power supply. Charging interface AC.

The switch KA1 in the first relay switch group KA1/KA2 is connected to the positive pole of the first battery EA, the switch KA2 is connected to the negative pole of the first battery EA, the switch KA1 and the switch KA2 are turned on or off synchronously, when the switch KA1 and the switch KA2 When it is turned on, the circuit between the first battery EA and the battery interface is an open circuit, and when the switch KA1 and the switch KA2 are turned off, the circuit between the first battery EA and the battery interface is an open circuit. The adjusting resistor F is set between the switch KA1 and the positive pole of the battery interface. The adjusting switch KF is connected in parallel with the adjusting resistor F. When the adjusting switch KF is turned on, the adjusting resistor F is short-circuited. When the adjusting switch KF is turned off, the adjusting resistor F The circuit is connected, so that the positive pole of the first battery EA is connected to the positive pole of the battery interface through the series switch KA1 and the adjusting resistor F in sequence.

The switch KB1 in the second relay switch group KB1/KB2 is connected to the positive pole of the second battery EA, the switch KB2 is connected to the negative pole of the second battery EB, the switch KB1 and the switch KB2 are synchronously turned on or off, when the switch KB1 and the switch KB2 When it is turned on, the circuit between the second battery EB and the battery interface is an open circuit, and when the switch KB1 and the switch KB2 are turned off, the circuit between the second battery EB and the battery interface is an open circuit.

The first battery management system BMC-A is electrically connected to the first relay switch group KA1/KA2, so as to realize the regulation of turning on or off the first relay switch group KA1/KA2. The second battery management system BMC-B is electrically connected to the second relay switch group KB1/KB2, so as to realize the regulation of turning on or off the second relay switch group KB1/KB2. In some embodiments, the first battery management system BMC-A is electrically connected to the second battery management system BMC-B, so that the first battery management system BMC-A controls the second relay switch through the second battery management system BMC-B The group KB1/KB2 is turned on or off; or the second battery management system BMC-B controls the second relay switch group KB1/KB2 to be turned on or off through the first battery management system BMC-A. In other embodiments, the second battery management system BMC-B is connected to the on-board controller through an external CAN, so that the on-board controller realizes the second relay switch group KB1/KB2 and/or through the second battery management system BMC-B. Adjustment of the second relay switch group KB1/KB2 on or off. In some other embodiments, the second battery management system BMC-B is electrically connected to the regulating switch KF, so as to realize the regulation of the battery management system BMC-B on or off the regulating switch KF.

The first battery EA has a high energy density, but its charging capacity is weak, and it is mainly used for mileage replenishment; the second battery EB uses a fast-charging battery, and the second battery EB has no advantages in energy but has a strong charging capacity, and can quickly charge a certain amount of electricity , for short-distance use, and quick energy replenishment. Those skilled in the art can understand that when connecting a DC charging power source for DC fast charging, since the second battery EB has fast charging capability, unless the user chooses actively, he will always choose to consume the power of the second battery EB first. Similarly, Fast charging also always performs priority charging for the second battery EB. When the battery interface is connected to the AC charging power supply for AC charging, considering the limitation of the AC charging equipment, the slow charging current is limited, even if the battery with fast charging capability is charged, the energy replenishment speed is still limited. The battery that started charging first will be converted to another battery after it is fully charged. This involves the conversion of two battery packs. The current is actively limited to a small value. After that, the two batteries are in parallel state for a short time. A quick pass opening and closing of the relay switch bank enables battery switching. In the parallel connection phase of double battery terminals, due to the voltage difference between the batteries, one battery pack may charge the other battery pack, and the current in this process is uncontrollable, so an adjustment resistor F is connected in series in the loop to use The purpose is to limit the current at this time within a safe and small range, thereby reducing current sampling errors and eliminating safety risks.

In some embodiments, the positive and negative poles of the DC charging interface are respectively provided with a third switch group K1/K2, the third switch group K1/K2 is used to control the connection or disconnection of the battery interface and the DC power supply, the third switch group K1/K2 adopts relay switch.

Specifically, as shown in FIG. 1 , the switch K1 of the third switch group K1/K2 is set at the positive pole of the DC charging interface, and the switch K2 of the third switch group K1/K2 is set at the negative pole of the DC charging interface. The switch K1 and the switch K2 of the third switch group K1/K2 are turned on or off synchronously. When the third switch group K1/K2 is turned on, the DC charging power supply is disconnected from the battery interface circuit.

In some embodiments, the first battery module further includes a plurality of first cells and a plurality of first cell controllers (CMC-A-1, CMC-A-2...CMC-A-n), and the plurality of first The battery cell controller is used to balance the multiple first battery cells, and the multiple first battery cell controllers are connected to the first battery management system BMC-A.

Specifically, the first battery EA includes a plurality of first cells, and each first cell controller in the plurality of first cell controllers is used for voltage sampling, temperature sampling and discharge equalization of the first cells. The first battery management system BMC-A realizes the control of the first battery EA by connecting multiple first battery cell controllers to obtain parameters such as voltage and temperature of the multiple first battery cells.

In some embodiments, the second battery module further includes a plurality of second cells and a plurality of second cell controllers, and the plurality of second cell controllers (CMC-B-1, CMC-B-2... CMC-B-n) is used to balance multiple second battery cells, and multiple second battery cell controllers are connected to the second battery management system.

Specifically, the second battery EA includes a plurality of second cells, and each second cell controller in the plurality of second cell controllers is used for voltage sampling, temperature sampling and discharge equalization of the second cells. The second battery management system BMC-B realizes the control of the first battery EB by connecting multiple second battery cell controllers to obtain parameters such as voltage and temperature of the multiple second battery cells.

In some embodiments, a fuse FU is further included, and the negative terminal of the battery interface is electrically connected to the first battery EA and the second battery EB through the fuse FU.

Specifically, as shown in Figure 1, the fuse FU is located on the bus of the dual-battery system to respond to short-circuit faults in the high-voltage network.

In some embodiments, it also includes a first current sensor CS1 and a second current sensor CS2, the second battery CS2 is connected to the fuse through the series connection of the first current sensor CS1 and the second current sensor CS2, and the first battery EA passes the first current Sensor CS1 is connected to the fuse.

Specifically, as shown in FIG. 1, during the whole charging process, the first battery management system BMC-A and the second battery management system BMC-B monitor the cell voltages of the two first batteries EA and the second battery CB in real time, and Real-time calculation of the SOC of the two battery packs and the current maximum charging current limit to achieve the life and safety of the two battery packs. Wherein, the first current sensor CS1 is used for current detection on the high-voltage bus of the dual-battery system. The second current sensor CS2 is used for the current detection of the second battery EB. When the second battery EB is working, it is checked with the first current sensor CS1; when the first battery EA and the second battery EA are working at the same time, the difference is used method to calculate the current of the first battery EA.

Having described various embodiments of the present disclosure above, the foregoing description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and alterations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principle of each embodiment, practical application or technical improvement in the market, or to enable other ordinary skilled in the art to understand this article.

Claims (7)

1. A dual battery apparatus, comprising:

the first battery module comprises a first battery management system, a first battery and a first relay switch group, the first battery relay group is connected with the positive electrode and the negative electrode of the first battery, and the first battery management system is electrically connected with the first relay switch group;

the second battery module comprises a second battery management system, a second battery and a second relay switch group, the second battery relay group is connected to the positive electrode and the negative electrode of the second battery, and the second battery management system is electrically connected with the second relay switch group;

the first battery and the second battery are connected in parallel at one end of the battery interface, the first battery is connected with the battery interface through the first relay switch group, the second battery is connected with the battery interface through the second relay switch, and the battery interface further comprises a discharging interface, a direct-current charging interface and an alternating-current charging interface;

the first end of the adjusting resistor is connected with the first relay switch group, and the second end of the adjusting resistor is connected with the battery interface;

the adjusting switch is connected with the adjusting resistor in parallel.

2. The device of claim 1, wherein a positive electrode and a negative electrode of the direct current charging interface are respectively provided with a third switch group, the third switch group is used for controlling connection or disconnection of the battery interface and the direct current power supply, and the third switch group is a relay switch.

3. The apparatus of claim 2, wherein the first battery module further comprises a plurality of first cells and a plurality of first cell controllers, wherein the plurality of first cell controllers are configured to balance the plurality of first cells, and wherein the plurality of first cell controllers are coupled to the first battery management system.

4. The apparatus of claim 3, wherein the second battery module further comprises a plurality of second cells and a plurality of second cell controllers, wherein the plurality of second cell controllers are configured to balance the plurality of second cells, and wherein the plurality of second cell controllers are coupled to the second battery management system.

5. The device of claim 4, further comprising a fuse, wherein a negative interface of the battery interface is electrically connected to the first battery and the second battery through the fuse.

6. The device of claim 5, further comprising a first current sensor and a second current sensor, wherein the second battery is connected to the fuse through the first current sensor and the second current sensor in series, and wherein the first battery is connected to the fuse through the first current sensor.

7. The device of claim 6, wherein the regulating switch is a relay switch.

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