A power battery system for an automobile

Abstract

The present invention discloses a power battery system for an automobile, comprising a power battery module, a controllable connection module, and a control module. The power battery module comprises a plurality of battery cells, the controllable connection module comprises a plurality of controllable switches, any of which is connected to a corresponding battery cell to form a second output circuit. The control module is used to determine at least one target cell in a first working state, and to control the on / off switching of the controllable connection module according to the target cell, wherein the target cell is a specific cell among all the battery cells. The present invention can achieve partial discharge of the power battery module, and the power battery module can take into account the discharge and power supply in both the power-off state and the starting state of the entire vehicle. There is no need to set hardware modules such as a starting battery outside the power battery module, thereby helping to reduce use and maintenance costs. The present invention is widely used in the field of automotive technology.

Description

Technical Field

[0001] The present invention relates to the field of automobile technology, and in particular to a power battery system for an automobile. Background Art

[0002] Current new energy vehicles are equipped with power batteries. In addition to powering high-power electrical appliances such as motors, these batteries can also power appliances such as air conditioners, lighting, central control panels, and audio systems. In current new energy vehicle technology, the power battery switches between operating states such as discharge, charge, and disconnection (neither discharge nor charge). When disconnected, the power battery cannot provide external power. However, the vehicle's control modules and video surveillance systems, as well as the battery management system (BMS) used to control the charging and discharging of the power battery, operate continuously. If the BMS loses power, it will be unable to control the discharge of the power battery. Therefore, the vehicle must be equipped with an uninterrupted starting power supply. Current new energy vehicle technology typically requires a starting battery in addition to the power battery. This increases manufacturing and operating costs due to the complex hardware structure. Furthermore, the starting battery and the power battery typically have different parameters such as voltage and current, which can be inconvenient to maintain. Summary of the Invention

[0003] In view of the technical problems of current new energy vehicles such as complex battery systems, high costs, and inconvenient maintenance, the present invention aims to provide a power battery system for automobiles. The power battery system for automobiles includes:

[0004] Power battery module; the power battery module includes a plurality of battery cells;

[0005] A controllable connection module; the controllable connection module includes a plurality of controllable switches, any of which is connected to a corresponding battery cell to form a second output circuit;

[0006] Control module; the control module is used to determine at least one target cell in a first working state, and control the on-off of the controllable connection module according to the target cell; wherein the target cell is a specific battery cell among all the battery cells.

[0007] Furthermore, the battery cells are arranged in a matrix form;

[0008] The battery cells in the same row or column are sequentially connected in series to form a first output circuit.

[0009] Furthermore, for any one of the controllable switches, the controllable switch is arranged between two adjacent battery cells in the same row or column, one end of the controllable switch is connected to the first pole of one of the battery cells, and the other end of the controllable switch is connected to the first pole of the other battery cell, forming the second output circuit.

[0010] Furthermore, the first electrode is a positive electrode or a negative electrode.

[0011] Furthermore, the determining of at least one target monomer includes:

[0012] detecting operating parameters of each of the battery cells;

[0013] Setting a first threshold;

[0014] Screening out the battery cells whose corresponding operating parameters are higher or lower than the first threshold as the target cells;

[0015] Path planning is performed according to the location of each target cell to obtain a discharge path.

[0016] Furthermore, the determining of at least one target monomer includes:

[0017] detecting operating parameters of each of the battery cells;

[0018] Set optimal parameters;

[0019] Obtaining a parameter deviation value of each of the battery cells; the parameter deviation value is the modulus of the difference between the operating parameter and the optimal parameter;

[0020] According to each of the parameter deviation values, a distance weight is set for each of the battery cells; the distance weight is positively correlated with the parameter deviation value, and the distance weight is used to weight the actual distance between the corresponding battery cell and other battery cells;

[0021] Perform shortest path planning based on the location of each battery cell and each distance weight to obtain a discharge path;

[0022] Each of the battery cells that the discharge path passes through is determined as the target cell.

[0023] Furthermore, controlling the on and off of the controllable connection module according to the target monomer includes:

[0024] Setting the controllable switch through which the discharge path passes to an on state;

[0025] The controllable switch that the discharge path does not pass through is set to an off state.

[0026] Furthermore, the power battery system for a vehicle further includes:

[0027] A first power supply module; an input end of the first power supply module is used to be connected to the first output circuit;

[0028] A second power supply module; an input end of the second power supply module is used to be connected to the second output circuit.

[0029] Furthermore, the control module is configured to, in the first working state, disconnect the first power supply module from the first output circuit, connect the second power supply module to the second output circuit, control each of the target cells to discharge, and control the battery cells that are not target cells to stop discharging;

[0030] The control module is used to set all the controllable switches to the off state in the second working state, disconnect the connection between the second power supply module and the second output circuit, connect the connection between the first power supply module and the first output circuit, and control all the battery cells to discharge.

[0031] Furthermore, the first working state is a vehicle power-off state, and the second working state is a vehicle power-on state.

[0032] The beneficial effects of the present invention are as follows: the power battery system for automobiles in the embodiment can realize partial discharge of the power battery module, and the power battery module can take into account the discharge power supply in both the power-off state and the vehicle-starting state of the entire vehicle, without the need to set up hardware modules such as starting batteries outside the power battery module, which is conducive to reducing usage costs and maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a schematic structural diagram of a power battery system for a vehicle in an embodiment;

[0034] Figure 2 Schematic diagram of the structure of the power battery module in the embodiment;

[0035] Figure 3 This is a schematic structural diagram of a controllable connection module in an embodiment;

[0036] Figure 4 Schematic diagram of the working principle of the controllable connection module in the embodiment;

[0037] Figure 5 This is a schematic structural diagram of a power battery system for a vehicle in a first working state according to an embodiment;

[0038] Figure 62 is a schematic structural diagram of a power battery system for a vehicle in a second working state according to an embodiment;

[0039] Figure 7 This is a schematic diagram of the principle of the first execution method of the step of determining at least one target monomer in the embodiment;

[0040] Figure 8 Schematic diagram of the principle of the second execution method of the step of determining at least one target monomer in the embodiment. DETAILED DESCRIPTION

[0041] In this embodiment, the structure of the power battery system for the vehicle is as follows: Figure 1 As shown. Figure 1 , the power battery system for automobiles includes a power battery module, a controllable connection module and a control module.

[0042] The structure of the power battery module is as follows Figure 2 As shown. Figure 2 , the power battery module includes multiple battery cells. Figure 2 In the present invention, a battery cell may be the smallest component unit of a power battery module, for example, a battery cell is a battery cell; a battery cell may not be the smallest component unit of a power battery module, for example, a battery cell is a battery module composed of multiple battery cells.

[0043] Reference Figure 2 , each battery cell is connected to form a first output circuit. Specifically, each battery cell can be connected in series, in parallel, or in combination of series and parallel to form a first output circuit. The output voltage can be increased by connecting in series, and the output current can be increased by connecting in parallel. In this embodiment, each battery cell can be connected as follows Figure 2 As shown, the battery cells are arranged in a matrix form, and each battery cell belongs to a row and a column. The battery cells in the same row can be connected in series in sequence. For example, among the battery cells in the same row, the positive electrode of the first battery cell serves as the positive electrode of the row, the negative electrode of the first battery cell is connected to the positive electrode of the second battery cell, the negative electrode of the second battery cell is connected to the positive electrode of the third battery cell... and the negative electrode of the last battery cell serves as the negative electrode of the row. Then, the battery cells in all rows are connected in parallel to form a first output circuit.

[0044] In this embodiment, a controllable connection module and a control module are further provided on the basis of the first output circuit. One form of the controllable connection module is as follows: Figure 3 shown.

[0045] Reference Figure 3, taking a column of battery cells in a matrix-type power battery module as an example, including multiple battery cells such as battery cell A, battery cell B, battery cell C, battery cell D, battery cell E, battery cell F, battery cell G and battery cell H, these battery cells have been connected to the first output circuit. The controllable connection module includes multiple controllable switches such as controllable switch 000, controllable switch 001, controllable switch 002, controllable switch 003, controllable switch 004, controllable switch 005, controllable switch 006 and controllable switch 007; wherein one end of controllable switch 000 is connected to the outside, and the other end is connected to the first electrode ( Figure 3 One end of the controllable switch 001 is connected to the negative electrode of the battery cell A, and the other end is connected to the negative electrode of the battery cell B; one end of the controllable switch 002 is connected to the negative electrode of the battery cell B, and the other end is connected to the negative electrode of the battery cell C... One end of the controllable switch 007 is connected to the negative electrode of the battery cell G, and the other end is connected to the outside.

[0046] In this embodiment, devices such as relays, triodes, MOSFETs (Metal-Oxide-Semiconductor Field-Effect Transistors), or IGBTs (Insulate-Gate Bipolar Transistors) can be used as controllable switches. The control terminal of each controllable switch is connected to the control module, and the control module can independently control the on / off state of each controllable switch by sending a control level to each controllable switch.

[0047] For example, refer to Figure 4 , the control module sends an on-level (which can be a high level) to the controllable switches 000, 002, 003, 004, 006 and 007, thereby turning on these controllable switches; the control module sends an off-level (which can be a low level) to the controllable switches 001 and 005, thereby turning off these controllable switches. In this way, Figure 4 The second output circuit forms a conduction path that only passes through battery cell B (the battery cell to which the disconnected controllable switch 001 is connected in the current direction) and battery cell F (the battery cell to which the disconnected controllable switch 005 is connected in the current direction).

[0048] according to Figure 4The principle shown is that for a matrix-type power battery module, a column-wise conductive path can be formed by controlling the on / off states of the controllable switches connected to the battery cells in the same column. The combination of the on / off states of the controllable switches can then be used to control which battery cells this conductive path passes through or not. Based on the same principle, the on / off states of the controllable switches connected to the battery cells in any row can also be controlled to form a row-wise conductive path. Because a battery cell is simultaneously in a column and a row, a column-wise conductive path can be controlled to pass through this battery cell, while a row-wise conductive path can also be controlled to pass through this battery cell, thereby achieving a "turn" at the location of this battery cell. Since the conductive path can "turn" at any battery cell, the control module can form a conductive path extending in any direction by controlling the on / off states of the controllable switches.

[0049] Based on the above principle, the control module can, in a specific operating state (a first operating state), identify specific battery cells among all battery cells as target cells, and control the on / off switching of the controllable connection module based on the location of the target cells, thereby forming a conductive path in the first output circuit that passes through all target cells but does not pass through any non-target cells (battery cells that are not target cells). The energy provided by the discharge of all target cells is output through this conductive path, that is, this conductive path is the discharge path for all target cells. Regardless of whether all non-target cells are discharging or not, their energy flow will not pass through this conductive path.

[0050] In this embodiment, refer to Figure 1 The first power supply module is a low-voltage DC-DC module. The input end of the first power supply module is connected to the first output circuit, and the output end of the first power supply module is connected to uninterruptible electrical appliances such as VCU (Vehicle Control Unit), BMS and monitoring; the second power supply module is a high-voltage DC-DC module. The input end of the second power supply module is connected to the second output circuit, and the output end of the second power supply module is connected to high-voltage, high-power electrical appliances that do not require uninterruptible power, such as motors, air conditioners, and lights.

[0051] In this embodiment, it is assumed that the first working state is the vehicle power-off state (commonly known as the IG-OFF state, at which time, except for the normal fire powering the uninterrupted electrical appliances, the motors, air conditioners, lights and other electrical appliances are not powered), and the second working state is the vehicle power-on state (commonly known as the IG-ON state, at which time all electrical appliances in the vehicle can obtain power).

[0052] In this embodiment, when the car is in the first working state (the whole vehicle is powered off), refer to Figure 5, the control module controls the first power supply module to disconnect from the first output circuit, and controls the second power supply module to connect to the second output circuit, and forms a conduction path (discharge path) that only passes through the target cell by controlling the on and off of each controllable switch in the controllable connection module, controls each target cell to discharge, and controls the battery cells that are not target cells (non-target cells) to stop discharging; at this time, only the target cell in the second output circuit discharges and outputs the electric energy through the discharge path, while the non-target cell does not need to be discharged, thereby realizing partial discharge of the power battery module, and the power battery module can take into account the discharge and power supply in both the power-off state and the starting state of the whole vehicle, without setting hardware modules such as starting battery outside the power battery module, which is conducive to reducing the use cost and maintenance cost.

[0053] In this embodiment, when the car is in the second working state (the vehicle is started), refer to Figure 6 , the control module sets all controllable switches to the off state, so that there is no discharge path in the second output circuit, and each battery cell no longer discharges through the second output circuit; the control module controls the second power supply module to disconnect from the second output circuit, and controls the first power supply module to connect to the first output circuit, so that all battery cells discharge through the first output circuit, and the electric energy is converted by the first power supply module and provided to each electrical appliance for use.

[0054] In this embodiment, when executing the step of determining at least one target monomer, the control module may specifically execute the following steps:

[0055] S101A. Detecting the operating parameters of each battery cell;

[0056] S102A. Set a first threshold;

[0057] S103A. Filter out battery cells whose corresponding operating parameters are higher or lower than the first threshold value as target cells;

[0058] S104A. Perform path planning based on the location of each target cell to obtain a discharge path.

[0059] Steps S101A-S104A are a first method of determining a target monomer.

[0060] In step S101A, the control module may call the battery management system to detect the operating parameters of each battery cell. Specifically, the operating parameters to be detected may be one or more of voltage, temperature, discharge time, etc.

[0061] In step S102A, the control module sets a first threshold value. The first threshold value is used to compare the magnitude of the operating parameters of each battery cell. A first threshold value can be set for each type of operating parameter. For example, for an operating parameter such as voltage, the first threshold value can be set to 3.5V; for an operating parameter such as temperature, the first threshold value can be set to 40°C; and for an operating parameter such as discharge time, the first threshold value can be set to 40 min / h.

[0062] In step S103A, target cells can be screened based on the relationship between one or more operating parameters and their first thresholds. For example, if voltage is selected as an operating parameter, battery cells with voltages above the first threshold (3.5V) can be screened as target cells; if temperature is selected as an operating parameter, battery cells with temperatures below the first threshold (40°C) can be screened as target cells; and if discharge duration is selected as an operating parameter, battery cells with discharge durations below the first threshold (40 min / h) can be screened as target cells.

[0063] In step S104A, if Figure 7 As shown, the shortest path planning is performed according to the location of each target monomer, and the shortest path is obtained as the discharge path. Figure 7 The discharge path obtained by executing steps S101A-S104A passes through each target cell (the electric energy generated by the discharge of each target cell can be output through the discharge path) but does not pass through each non-target cell ( Figure 7 The discharge path in the figure only passes through the controllable switch turned on at the non-target monomer position and does not flow through the non-target monomer), and the length of the discharge path is the shortest among all the paths that meet the requirements.

[0064] In this embodiment, the principle of executing steps S101A-S104A is as follows: first, target cells that meet the requirements are screened out using the operating parameters and the first threshold value. Target cells can be screened out according to criteria such as the highest voltage, the lowest temperature, and the shortest discharge time, thereby achieving load and life balance between different battery cells. By using path planning, a discharge path with the shortest length can be obtained, which is beneficial to reducing the discharge loss of the target cell.

[0065] In this embodiment, when executing the step of determining at least one target monomer, the control module may specifically execute the following steps:

[0066] S101B detects the operating parameters of each battery cell;

[0067] S102B. Set optimal parameters;

[0068] S103B obtains the parameter deviation value of each battery cell;

[0069] S104B. Set the distance weight of each battery cell according to the deviation value of each parameter;

[0070] S105B performs shortest path planning based on the location of each battery cell and each distance weight to obtain a discharge path;

[0071] S106B. Determine each battery cell that the discharge path passes through as a target cell.

[0072] Steps S101B-S106B are a second method for determining the target monomer.

[0073] In step S101B, one or more operating parameters, such as voltage, temperature, and discharge duration, may be detected for each battery cell. For example, in this embodiment, the voltage, temperature, and discharge duration of each battery cell may be detected simultaneously to obtain the operating parameters in vector form, such as (voltage, temperature, and discharge duration).

[0074] In step S102B, the control module may call the battery management system to set an optimal parameter based on the current battery life, historical usage records, vehicle usage, etc. The optimal parameter may be expressed in a vector form such as (optimal voltage, optimal temperature, optimal discharge time).

[0075] In step S103B, for each battery cell, the modulus of the difference between its corresponding operating parameters (voltage, temperature, discharge duration) and the optimal parameters (optimal voltage, optimal temperature, optimal discharge duration) is calculated as the parameter deviation value for that battery cell. The parameter deviation value indicates the degree to which a battery cell's operating parameters deviate from their optimal state.

[0076] In step S104B, a distance weight is set for each battery cell based on its parameter deviation value. In this embodiment, the distance weight is positively correlated with the parameter deviation value, and the parameter deviation value of a battery cell itself (or after dedimensionalization) can be used as the distance weight of the battery cell.

[0077] In step S105B, the shortest path planning is performed based on the location of each battery cell and each distance weight to obtain the discharge path. Figure 8 , select two battery cells (generally located at the edge of the power battery module) as the starting point and end point respectively, and execute the shortest path planning algorithm to perform the shortest path planning.

[0078] In step S105B, since each battery cell has a corresponding distance weight, when executing the shortest path planning algorithm and using the distance between two battery cells, the distance weights of the two battery cells are considered. Figure 8 In the example, it is assumed that the distance weight corresponding to battery cell A is A , the distance weight corresponding to battery cell B is the distance weight B Since the discharge path in this embodiment extends in the row and column directions of the matrix, the actual distance between battery cell A and battery cell B is d 实际 (A, B) = 3, which means starting from battery cell A and passing through 3 battery cells to reach battery cell B. When executing the shortest path planning algorithm, the distance between battery cell A and battery cell B input into the shortest path planning algorithm can be the weighted distance d 加权 (A, B), specifically, it can be expressed by formula d 加权 (A,B)=d 实际 (A,B)×distance weight A ×Distance Weight B Calculate the weighted distance d 加权 (A,B).

[0079] In step S105B, the shortest path planning algorithm can obtain the shortest path by traversing all non-repeated paths between the starting point and the end point. In step S106B, each battery cell (e.g. Figure 8 Each battery cell that coincides with the shortest path is determined as the target cell, and the shortest path is determined as the discharge path. The control module refers to Figure 4 The principle is to set the controllable switch that the discharge path passes through to the on state and the controllable switch that the discharge path does not pass through to the off state, so that each target monomer can discharge and output electrical energy through the discharge path, while non-target monomers will not discharge through the discharge path.

[0080] In this embodiment, the principle of executing steps S101B-S106B is as follows: after weighting the actual distance by using the distance weight determined by the parameter deviation value, a discharge path is planned using the shortest path planning algorithm. A discharge path can be determined first. In addition to considering the influence of the actual distance between battery cells, this discharge path also considers the operating parameters of each battery cell, thereby obtaining a discharge path with a better overall consideration of discharge loss and operating parameters. After determining the discharge path, the target cell is determined. When the differences in operating parameters between battery cells are not obvious, the focus can be on optimizing discharge loss and overall operating parameter performance.

[0081] In this embodiment, the control module can also perform continuous health checks on each battery cell. For example, in the first operating state, the control module can invoke the battery management system to monitor each battery cell in real time and obtain the health status of each battery cell. The control module marks battery cells with unqualified health status. When determining target cells during steps S101A-S104A or S101B-S106B, marked battery cells are not identified as target cells, thereby reducing damage to unhealthy battery cells and ensuring stable power supply in the first operating state.

[0082] The "first output circuit" and "second output circuit" mentioned in this embodiment are "output circuits" when the power battery module is in the discharging state and these circuits are used to output the electrical energy generated by the discharge of each battery cell. In fact, these output circuits can also receive external electrical energy to charge each battery cell when the power battery module is in the charging state. Therefore, these output circuits are actually "input circuits." Similarly, the "first power supply module" and "second power supply module" mentioned in this embodiment can also receive external electrical energy to charge each battery cell when the power battery module is in the charging state. Therefore, these power supply modules are actually "charging modules."

[0083] It should be noted that, unless otherwise specified, when a feature is referred to as being "fixed" or "connected" to another feature, it may be directly fixed or connected to the other feature, or it may be indirectly fixed or connected to the other feature. In addition, the descriptions of up, down, left, right, etc. used in this disclosure are only relative to the relative positional relationships of the components of the present disclosure in the accompanying drawings. The singular forms of "a", "" and "the" used in this disclosure are also intended to include the plural forms, unless the context clearly indicates otherwise. In addition, unless otherwise defined, all technical and scientific terms used in this embodiment have the same meaning as those generally understood by those skilled in the art. The terms used in the specification of this embodiment are only for describing specific embodiments and are not intended to limit the invention. The term "and / or" used in this embodiment includes any combination of one or more related listed items.

[0084] It should be understood that, although the present disclosure may adopt the term first, second, third etc. to describe various elements, these elements should not be limited to these terms.These terms are only used to distinguish the elements of the same type from each other.For example, without departing from the scope of the present disclosure, the first element may also be referred to as the second element, and similarly, the second element may also be referred to as the first element.The use of any and all examples or exemplary language ("for example", "such as" etc.) provided by the present embodiment is only intended to better illustrate embodiments of the present invention, and unless otherwise required, the scope of the present invention will not be limited.

[0085] It should be appreciated that embodiments of the present invention can be implemented or practiced by computer hardware, a combination of hardware and software, or by computer instructions stored in a non-transitory computer-readable memory. The methods can be implemented in a computer program using standard programming techniques - including a non-transitory computer-readable storage medium configured with a computer program, wherein the storage medium so configured causes the computer to operate in a specific and predefined manner - according to the methods and figures described in the specific embodiments. Each program can be implemented in a high-level procedural or object-oriented programming language to communicate with the computer system. However, if desired, the program can be implemented in assembly or machine language. In any case, the language can be a compiled or interpreted language. In addition, the program can be run on a programmed application-specific integrated circuit for this purpose.

[0086] In addition, the operations of the processes described in this embodiment may be performed in any suitable order, unless otherwise indicated in this embodiment or otherwise clearly contradicted by the context. The processes described in this embodiment (or variations and / or combinations thereof) may be performed under the control of one or more computer systems configured with executable instructions, and may be implemented as code (e.g., executable instructions, one or more computer programs, or one or more applications) that is executed collectively on one or more processors, by hardware, or a combination thereof. A computer program includes multiple instructions that can be executed by one or more processors.

[0087] Furthermore, the method can be implemented in any type of computing platform that is operably connected to a suitable computer, including but not limited to a personal computer, a minicomputer, a mainframe, a workstation, a network or distributed computing environment, a separate or integrated computer platform, or in communication with a charged particle tool or other imaging device, etc. Various aspects of the present invention can be implemented as machine-readable code stored on a non-transitory storage medium or device, whether removable or integrated into a computing platform, such as a hard disk, an optical read and / or write storage medium, RAM, ROM, etc., so that it can be read by a programmable computer, and when the storage medium or device is read by the computer, it can be used to configure and operate the computer to perform the process described herein. In addition, the machine-readable code, or portions thereof, can be transmitted over a wired or wireless network. When such media includes instructions or programs that implement the above steps in conjunction with a microprocessor or other data processor, the invention of this embodiment includes these and other different types of non-transitory computer-readable storage media. When programmed according to the methods and techniques of the present invention, the present invention also includes the computer itself.

[0088] The computer program can be applied to input data to perform the functions of the present embodiment, thereby converting the input data to generate output data that is stored in a non-volatile memory. The output information can also be applied to one or more output devices such as a display. In a preferred embodiment of the present invention, the converted data represents a physical and tangible object, including a specific visual depiction of the physical and tangible object produced on the display.

[0089] The above are merely preferred embodiments of the present invention. The present invention is not limited to the aforementioned embodiments. As long as the technical effects of the present invention are achieved by the same means, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention. Within the scope of protection of the present invention, various modifications and variations of the technical solutions and / or implementation methods may be made.

Claims

1. A power battery system for an automobile, characterized in that: The power battery system for a vehicle comprises: Power battery module; the power battery module includes a plurality of battery cells; A controllable connection module; the controllable connection module includes a plurality of controllable switches, any of which is connected to a corresponding battery cell to form a second output circuit; Control module; the control module is used to determine at least one target cell in a first working state, and control the on-off of the controllable connection module according to the target cell; wherein the target cell is a specific battery cell among all the battery cells; The battery cells are arranged in a matrix form; The battery cells in the same row or column are sequentially connected in series to form a first output circuit; For any of the controllable switches, the controllable switch is arranged between two adjacent battery cells in the same row or column, one end of the controllable switch is connected to the first electrode of one of the battery cells, and the other end of the controllable switch is connected to the first electrode of the other battery cell, forming the second output circuit; The determining of at least one target monomer comprises: detecting operating parameters of each of the battery cells; Set optimal parameters; Obtaining a parameter deviation value of each of the battery cells; the parameter deviation value is the modulus of the difference between the operating parameter and the optimal parameter; According to each of the parameter deviation values, a distance weight is set for each of the battery cells; the distance weight is positively correlated with the parameter deviation value, and the distance weight is used to weight the actual distance between the corresponding battery cell and other battery cells; Perform shortest path planning based on the location of each battery cell and each distance weight to obtain a discharge path; Each of the battery cells that the discharge path passes through is determined as the target cell.

2. The power battery system for a vehicle according to claim 1, characterized in that: The first electrode is a positive electrode or a negative electrode.

3. The power battery system for a vehicle according to claim 1, characterized in that: The determining of at least one target monomer comprises: detecting operating parameters of each of the battery cells; Setting a first threshold; Screening out the battery cells whose corresponding operating parameters are higher or lower than the first threshold as the target cells; Path planning is performed according to the location of each target cell to obtain a discharge path.

4. The power battery system for a vehicle according to any one of claims 1 to 3, characterized in that: The controlling the on and off of the controllable connection module according to the target monomer includes: Setting the controllable switch through which the discharge path passes to an on state; The controllable switch that the discharge path does not pass through is set to an off state.

5. The power battery system for a vehicle according to any one of claims 1 to 3, characterized in that: The power battery system for a vehicle further includes: A first power supply module; an input end of the first power supply module is used to be connected to the first output circuit; A second power supply module; an input end of the second power supply module is used to be connected to the second output circuit.

6. The power battery system for a vehicle according to claim 5, characterized in that: The control module is configured to, in the first working state, disconnect the first power supply module from the first output circuit, connect the second power supply module to the second output circuit, control each of the target cells to discharge, and control the battery cells that are not target cells to stop discharging; The control module is used to set all the controllable switches to the off state in the second working state, disconnect the connection between the second power supply module and the second output circuit, connect the connection between the first power supply module and the first output circuit, and control all the battery cells to discharge.

7. The power battery system for a vehicle according to claim 6, characterized in that: The first working state is a vehicle power-off state, and the second working state is a vehicle power-on state.

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