CN218568952U

CN218568952U - Double-battery device

Info

Publication number: CN218568952U
Application number: CN202222620243.8U
Authority: CN
Inventors: 刘颖; 马阔; 吴一龙; 陈晨; 仝鑫
Original assignee: FAW Volkswagen Automotive Co Ltd
Current assignee: FAW Volkswagen Automotive Co Ltd
Priority date: 2022-09-30
Filing date: 2022-09-30
Publication date: 2023-03-03
Anticipated expiration: 2032-09-30

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

Double-battery device

Technical Field

The utility model relates to an on-vehicle bi-cell system technical field specifically relates to a bi-cell device.

Background

Currently, the dual battery system is intended to develop a battery system that satisfies both fast charge and high endurance. Two types of batteries are included in the dual battery system, wherein: the first battery is high in energy and energy density, but weak in charging capacity, and is mainly used for a mileage supplementation link; the second battery has no advantage but has a strong charging ability, and can be charged with a certain amount of electricity quickly for short-distance use and quick energy supplement. The system can meet the requirement of quick power supplement of the electric vehicle, can meet the requirement of long endurance mileage of the electric vehicle, and simultaneously prolongs the overall running life of the system.

SUMMERY OF THE UTILITY MODEL

In order to solve at least one aspect of the above problem, the present invention provides a dual battery device, including: 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 to 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 relay switch group is connected to the positive pole and the negative pole 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 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.

Preferably, the positive electrode and the negative electrode of the direct current charging interface are respectively provided with a third switch group, the third switch group is used for controlling the connection or disconnection of the battery interface and the direct current power supply, and the third switch group is a 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 for balancing the plurality of first cells, and the plurality of 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 for balancing the plurality of second cells, and the plurality of second cell controllers are connected to the second battery management system.

Preferably, the battery further comprises a fuse, and a negative electrode interface of the battery interface is electrically connected with the first battery and the second battery through the fuse.

Preferably, the battery further comprises a first current sensor and a second current sensor, the second battery is connected with the fuse through the first current sensor and the second current sensor which are connected in series in sequence, and the first battery is connected with the fuse through the first current sensor.

Preferably, the regulating switch is a relay switch.

The utility model discloses a double cell device has following beneficial effect: the dual-battery system has the possibility of selecting different electric core systems, so algorithms such as SOC calculation and the like are different, historical data of the batteries can be stored in the BMC controller, and each battery uses a single BMC controller, so that replacement of a certain battery can be completed more conveniently when the certain battery has an after-sale problem. In the stage of parallel connection of the two battery ends, due to voltage difference between batteries, a situation that one battery pack charges another battery pack can occur, and current in the process is uncontrollable, so that a regulating resistor is connected in series in a loop and used for limiting the current in parallel connection within a safe and small range, thereby reducing current sampling errors and eliminating safety risks. The regulating resistor is connected to the loop by opening and closing the regulating switch.

Drawings

For a better understanding of the above and other objects, features, advantages and functions of the present invention, reference should be made to the embodiments illustrated in the drawings. Like reference numerals in the drawings refer to like parts. It will be appreciated by persons skilled in the art that the drawings are intended to illustrate preferred embodiments of the invention without any limiting effect on the scope of the invention, and that the various components in the drawings are not to scale.

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

Detailed Description

Exemplary embodiments of the present disclosure are described below with reference to the accompanying drawings, in which various details of embodiments of the present disclosure are included to assist understanding, and which are to be considered as merely exemplary. 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.

The term "include" and variations thereof as used herein is meant to be inclusive in an open-ended manner, i.e., "including but not limited to". Unless specifically stated otherwise, the term "or" means "and/or". 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 additional embodiment". The terms "first," "second," and the like may refer to different or the same objects. Other explicit and implicit definitions are also possible below.

To address, at least in part, one or more of the above problems and other potential problems, one embodiment of the present disclosure proposes a dual battery apparatus, including: the battery management system comprises se:Sub>A first battery module, se:Sub>A second battery module, se:Sub>A battery interface, an adjusting resistor F and an adjusting switch KF, wherein the first battery module comprises se:Sub>A first battery management system BMC-A, se:Sub>A first battery EA and se:Sub>A first relay switch group KA1/KA2, the first battery relay group KA1/KA2 is connected with the positive electrode and the negative electrode of the first battery EA, and the first battery management system BMC-A is electrically connected with the first relay switch group KA1/KA 2; the second battery module comprises a second battery management system BMC-B, a second battery EB and a second relay switch group KB1/KB2, the second relay switch group KB1/KB2 is connected to the positive electrode and the negative electrode of the second battery, and the second battery management system BMC-B is electrically connected with the second relay switch group KB1/KB 2; the first battery EA and the second battery EB are connected in parallel at one end of the battery interface, the first battery EA is connected with the battery interface through a first relay switch group KA1/KA2, the second battery EB is connected with the battery interface through a second relay switch group KB1/KB2, 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 F is connected with the first relay switch group, and the second end of the adjusting resistor F is connected with the battery interface; the regulating switch KF is connected in parallel with the regulating resistor F.

Specifically, as shown in fig. 1, the positive electrode and the negative electrode of the battery interface are respectively connected to the first battery EA and the second battery EB through HV + and HV-lines, the positive electrode and the negative electrode of the battery interface further include a discharging interface for connecting an onboard electric device, such as an adaptive cruise control system ACC, an onboard heater PTC, an engine Motor, and the like, and the positive electrode and the negative electrode of the battery interface further include a DC charging interface DC for connecting a DC charging power supply and an AC charging interface AC for connecting an AC charging power supply.

The switch KA1 in the first relay switch group KA1/KA2 is connected with the positive electrode of the first battery EA, the switch KA2 is connected with the negative electrode of the first battery EA, the switch KA1 and the switch KA2 are synchronously connected or disconnected, when the switch KA1 and the switch KA2 are connected, a circuit between the first battery EA and the battery interface is an access circuit, and when the switch KA1 and the switch KA2 are disconnected, the circuit between the first battery EA and the battery interface is an open circuit. Adjusting resistor F sets up between the positive pole of switch KA1 and battery interface, adjusting switch KF and adjusting resistor F's parallelly connected, and when adjusting switch KF switched on, adjusting resistor F is by the short circuit, and when adjusting switch KF disconnection, adjusting resistor F access circuit makes the positive pole of first battery EA loop through the positive pole that battery interface was connected to switch KA1 and adjusting resistor F of establishing ties.

The switch KB1 in the second relay switch group KB1/KB2 is connected with the positive electrode of the second battery EA, the switch KB2 is connected with the negative electrode of the second battery EB, the switch KB1 and the switch KB2 are synchronously switched on or off, when the switch KB1 and the switch KB2 are switched on, a circuit between the second battery EB and the battery interface is a closed circuit, and when the switch KB1 and the switch KB2 are switched 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 with the first relay switch group KA1/KA2 to realize the adjustment of the connection or disconnection of the first relay switch group KA1/KA 2. The second battery management system BMC-B is electrically connected to the second relay switch group KB1/KB2 to adjust the on/off of the second relay switch group KB1/KB 2. In some embodiments, the first battery management system BMC-se:Sub>A is electrically connected with the second battery management system BMC-B, so that the first battery management system BMC-se:Sub>A controls the second relay switch group KB1/KB2 to be switched on or off through the second battery management system BMC-B; or the second battery management system BMC-B controls the second relay switch group KB1/KB2 to be switched on or switched 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 via the external CAN to enable the on-board controller to adjust the on/off state of the second relay switch group KB1/KB2 and/or the second relay switch group KB1/KB2 via the second battery management system BMC-B. In still other embodiments, the second battery management system BMC-B is electrically connected to the adjustment switch KF to enable adjustment of the adjustment switch KF on or off by the battery management system BMC-B.

The first battery EA is high in energy density, but weak in charging capacity and mainly used for a mileage supplement link; the second battery EB adopts a quick-charging battery, has no advantages but has strong charging capacity, can be quickly charged into certain electric quantity and is used for short-distance use and quick energy supplement. As will be understood by those skilled in the art, when the DC fast charging is performed by connecting the DC charging power source, since the second battery EB has the fast charging capability, unless the user actively selects, the power of the second battery EB is always consumed, and similarly, the fast charging always performs the preferential charging for the second battery EB. When the battery interface is connected with an alternating current charging power supply for AC charging, the current for slow charging is limited in consideration of the limitation of an AC charging device, and the energy supplementing speed is still limited even if a battery with a fast charging capability is charged. The batteries which are charged firstly are fully charged and then are converted into the other batteries for charging, the conversion between the two batteries is related, the current is actively limited to a smaller value, then the two batteries are in a parallel connection state for a short time, and the batteries can be switched by quickly opening and closing the corresponding relay switch group. In the stage of parallel connection of the two battery ends, due to voltage difference between batteries, a situation that one battery pack charges another battery pack possibly occurs, and current in the process is uncontrollable, so that a regulating resistor F is connected in series in a loop and used for limiting the current at the moment in a safe and small range, thereby reducing current sampling errors and eliminating safety risks.

In some embodiments, the positive electrode and the negative electrode of the direct-current charging interface are respectively provided with a third switch group K1/K2, the third switch group K1/K2 is used for controlling the connection or disconnection between the battery interface and the direct-current power supply, and the third switch group K1/K2 adopts a relay switch.

Specifically, as shown in fig. 1, the switch K1 of the third switch group K1/K2 is disposed at the positive electrode of the dc charging interface, and the switch K2 of the third switch group K1/K2 is disposed at the negative electrode of the dc charging interface. And the switch K1 and the switch K2 of the third switch group K1/K2 are synchronously switched on or off, when the direct-current charging power supply is connected, the third switch group K1/K2 is switched on, the direct-current charging power supply is switched on with a circuit of the battery interface, and when the third switch group K1/K2 is switched off, the direct-current charging power supply is switched off with the circuit of the battery interface.

In some embodiments, the first battery module further includes se:Sub>A plurality of first cells and se:Sub>A plurality of first cell controllers (CMC-se:Sub>A-1, CMC-se:Sub>A-2 \8230; CMC-se:Sub>A-n) for balancing the plurality of first cells, the plurality of first cell controllers being connected to the first battery management system BMC-se:Sub>A.

Specifically, the first battery EA includes a plurality of first cells, and each of the plurality of first cell controllers is used for voltage sampling, temperature sampling, and discharge equalization of the first cell. The first battery management system BMC-se:Sub>A is connected to the plurality of first cell controllers to obtain parameters such as voltages and temperatures of the plurality of first cells, so as to control the first battery ese:Sub>A.

In some embodiments, the second battery module further includes a plurality of second cells and a plurality of second cell controllers (CMC-B-1, CMC-B-2 \8230; CMC-B-n) for equalizing the plurality of second cells, the plurality of second cell controllers being connected to a second battery management system.

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

In some embodiments, further comprising a fuse FU, the negative interface 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 fig. 1, fuse FU is located on the dual battery system bus for responding to a short circuit fault in the high voltage network.

In some embodiments, the battery further includes a first current sensor CS1 and a second current sensor CS2, the second battery CS2 is connected to a fuse through the first current sensor CS1 and the second current sensor CS2 connected in series, and the first battery EA is connected to the fuse through the first current sensor CS 1.

Specifically, as shown in fig. 1, in the entire charging process, the first battery management system BMC-se:Sub>A and the second battery management system BMC-B monitor the cell voltages of the two first batteries ese:Sub>A and the second batteries CB in real time, and calculate the SOCs and the current maximum charging current limits of the two battery packs in real time, so as to implement the service lives and the safety of the two battery packs. 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 detecting the current of the second battery EB, and checks with the first current sensor CS1 when the second battery EB operates; when the first battery EA and the second battery EA simultaneously operate, the current of the first battery EA is calculated using a difference method.

The foregoing description of the embodiments of the present disclosure has been presented for purposes of illustration and description, but is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations 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 was chosen in order to best explain the principles of the embodiments, the practical application, or technical improvements to the market, or to enable others of ordinary skill in the art to understand the disclosure.

Claims

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.