Anti-feed method, system and equipment for storage battery of electric vehicle and storage medium

Abstract

The invention relates to the field of batteries, in particular to an anti-feed method, system and device for an electric vehicle storage battery and a storage medium. The electric vehicle comprises a power battery and a storage battery. The method comprises the following steps: determining a battery unit in a non-fault state in the power battery; determining at least one first battery unit in the battery units in the non-fault state, wherein the first battery unit is used for supplying power to the storage battery; and controlling the at least one first battery unit to charge the storage battery. And under the condition that a power battery of the electric automobile breaks down, the safety and the use experience of passengers are improved.

Description

Technical Field

[0001] The present disclosure relates to the field of batteries, and more specifically, to an anti-feeding method, system, device and storage medium for an electric vehicle battery. Background Art

[0002] At present, when the high-voltage power battery of an electric vehicle fails, the vehicle will be restricted from using high-voltage electricity, and the low-voltage battery, that is, the storage battery, needs to be charged by the high-voltage battery to replenish its power. When the high-voltage power battery fails, the vehicle cannot use high-voltage electricity and is in a power-limited state. At this time, the low-voltage battery cannot obtain power from the high-voltage battery, which can easily cause the low-voltage battery to be fed back and the vehicle to be completely unusable. If the vehicle is in an unsafe state or a relatively cold environment, after the low-voltage battery is fed back, the vehicle's low-voltage electrical equipment, including hazard warning lights, air conditioning and other devices, cannot be turned on, making it impossible to guarantee the safety and user experience of passengers while waiting for rescue. Summary of the invention

[0003] One purpose of the present disclosure is to solve the problem of passenger safety and user experience when a power battery of an electric vehicle fails.

[0004] According to one aspect of the present disclosure, a method for preventing power feeding of a battery of an electric vehicle is provided, wherein the electric vehicle comprises a power battery and a battery, and the method comprises:

[0005] Determining a battery cell in the power battery that is in a non-faulty state;

[0006] Determine at least one first battery cell among the battery cells in the non-fault state, wherein the first battery cell is used to supply power to the storage battery;

[0007] The at least one first battery unit is controlled to charge the storage battery.

[0008] Optionally, the total power of the at least one battery unit is greater than or equal to the power requirement of the battery;

[0009] Before determining at least one first battery cell among the battery cells in the non-fault state, the method further includes:

[0010] Collecting battery parameters of the battery;

[0011] The power requirement of the battery is determined according to the battery parameters.

[0012] Optionally, each battery cell in the power battery is provided with a bypass harness and a switch device, and the switch device is used to connect the battery cell or the bypass harness;

[0013] The controlling the at least one first battery unit to charge the storage battery comprises:

[0014] Controlling the switch device so that all battery cells other than the first battery cell in the power battery are bypassed;

[0015] Controlling the power battery to charge the storage battery.

[0016] Optionally, when there are multiple first battery cells, a difference between a voltage of a battery cell with the highest voltage among the multiple first battery cells and a voltage of a battery cell with the lowest voltage among the multiple first battery cells is less than a first threshold.

[0017] Optionally, the determining a battery cell in the power battery that is in a non-faulty state includes:

[0018] Collecting battery parameters of each battery cell in the power battery;

[0019] According to the battery parameters of each battery cell, the battery cells in the power battery that are in a non-faulty state are determined.

[0020] Optionally, controlling the at least one first battery unit to charge the storage battery includes:

[0021] The direct current outputted by the at least one battery unit is controlled to be stepped down by a voltage conversion circuit to charge the storage battery.

[0022] Optionally, after controlling the at least one first battery unit to charge the storage battery, the method further includes:

[0023] monitoring battery parameters of the battery and the at least one first battery cell;

[0024] When the power level of the storage battery is greater than a second threshold, controlling the at least one first battery unit to stop charging;

[0025] When the power level of any one of the first battery cells is less than a third threshold, the at least one first battery cell is controlled to stop charging.

[0026] Optionally, after controlling the at least one first battery unit to charge the storage battery, the method further includes:

[0027] Determine the low voltage power consumption status of the vehicle;

[0028] When the vehicle is in a low-voltage power-down state and the battery is fully charged, controlling the at least one first battery unit to stop charging;

[0029] When the vehicle is in a low-voltage power-on state and the battery is fully charged, the power parameter of the battery is continuously monitored, and when the power parameter is less than a fourth threshold, the steps of selecting at least one first battery cell from the battery cells in the non-fault state and controlling the at least one first battery cell to charge the battery are re-executed.

[0030] Optionally, the battery unit includes a battery cell or a battery module.

[0031] According to a second aspect of the present disclosure, there is provided an electric vehicle battery charging system, comprising: a power battery and a control unit, wherein the power battery is connected to a battery charging port, and the electric vehicle battery charging system charges the battery through the battery charging port;

[0032] The control unit is used to execute the steps of the method described in any one of the first aspects.

[0033] According to a third aspect of the present disclosure, an electronic device is provided, comprising a processor and a memory, wherein the memory stores computer instructions, and when the computer instructions are executed by the processor, the steps of any one of the methods described in the first aspect are implemented.

[0034] Optionally, each battery cell in the power battery is provided with a bypass harness and a switch device, and the switch device is used to connect the battery cell or the bypass harness.

[0035] Optionally, the system further includes a voltage conversion circuit, which is disposed between the power battery and the battery charging port and is used for reducing the voltage of the direct current output by the power battery and outputting it to the battery charging port.

[0036] According to a fourth aspect of the present disclosure, there is provided a storage medium on which computer instructions are stored, and when the computer instructions are executed by a processor, the steps of any one of the methods described in the first aspect are implemented.

[0037] One of the technical effects of the present disclosure is that a method for preventing battery power feeding of an electric vehicle is provided. When a power battery fails, the battery cells in the power battery that are in a non-faulty state can be determined, and at least one battery cell for powering the battery can be determined therein, and controlled to charge the battery. In this way, the low-voltage power supply of the electric vehicle can be ensured even when the power battery fails, so that the lighting system and the air-conditioning system can continue to work, meeting the trial requirements in non-safe scenes or cold scenes, and improving user experience and safety. At the same time, it can also solve the problem that after the power battery fails, the power in the battery pack cannot be fully utilized, and the battery still needs to be discharged during subsequent maintenance, resulting in a large waste of electricity.

[0038] Other features and advantages of the embodiments of the present disclosure will become apparent from the following detailed description of exemplary embodiments of the present disclosure with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The accompanying drawings, which constitute a part of the specification, illustrate embodiments of the present disclosure and, together with the description, serve to explain the principles of the embodiments of the present disclosure.

[0040] Figure 1 is a flow chart of a method for preventing power feeding of an electric vehicle battery according to one embodiment;

[0041] Figure 2 is a block diagram of an electric vehicle battery charging system according to one embodiment;

[0042] Figure 3 is a block diagram of an electronic device according to one embodiment. DETAILED DESCRIPTION

[0043] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention unless otherwise specifically stated.

[0044] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0045] Techniques and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the techniques and equipment should be considered part of the specification.

[0046] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0047] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0048] The present application discloses a method for preventing power feeding of an electric vehicle battery, which can be applied to an electric vehicle, which can include a pure electric vehicle or a hybrid vehicle. Specifically, it can be applied when a power battery in an electric vehicle fails and the battery needs to be charged, such as Figure 1 As shown, it includes steps S11 to S13.

[0049] Step S11, determining the battery cells in the power battery that are in a non-faulty state.

[0050] In one example, the architecture of a power battery is generally a battery pack, a battery module, and a battery cell from large to small. In the embodiment of the present application, the battery cell can be a battery module or a battery cell, which can be flexibly configured based on actual needs. When the power battery of an electric vehicle fails, it does not mean that all the battery cells in the power battery have failed. Therefore, it is possible to first determine which battery cells in the power battery have not failed and can still be used in an emergency.

[0051] In an example of this embodiment, determining a battery cell in a power battery that is in a non-faulty state includes: collecting battery parameters of each battery cell in the power battery; and determining a battery cell in a non-faulty state in the power battery according to the battery parameters of each battery cell.

[0052] In one example, when the power battery of an electric vehicle fails, the BMS (Battery Management System) can collect the battery parameters of each battery module or battery cell in the power battery, which may include the voltage, temperature, internal resistance and other information of the battery cell, and report it to the vehicle controller, which determines whether each battery module or battery cell is in a faulty state or a non-faulty state. The specific number of the battery module or battery cell in a non-faulty state can be recorded so that the battery module or battery cell that is powered by the battery can be determined in the battery module or battery cell in a non-faulty state.

[0053] In this embodiment, when determining the status of each battery cell in the power battery, the low-voltage battery can preferentially supply power to the BMS and the vehicle controller.

[0054] Step S12: determining at least one first battery cell among the battery cells in a non-fault state, where the first battery cell is used to supply power to the storage battery.

[0055] After determining that there are no faulty battery cells in the power battery, one or more battery cells can be selected from these faulty battery cells to power the battery. In this example, the selection can be made from these faulty battery cells based on a preset selection scheme or selection logic. For example, it can be preset that when there are multiple battery cells that are not faulty, the battery cell with the most power can be selected to charge the battery. Alternatively, a certain number of battery cells can be preset to power the battery together.

[0056] In an example of this embodiment, the total power of at least one battery cell is greater than or equal to the power requirement of the battery; before determining at least one first battery cell in the battery cells in a non-fault state, the method also includes: collecting battery parameters of the battery; and determining the power requirement of the battery based on the battery parameters.

[0057] In one example, the battery parameters of the battery, such as voltage, etc., can be collected in advance to further calculate the battery power or power demand. When selecting the first battery unit to power the battery from the battery units in a non-faulty state, the minimum number of first battery units can be selected according to the battery power demand, and the total power of the first battery units is greater than the battery power demand, so that the battery can be fully charged at one time. At the same time, since the power battery is already in a faulty state, selecting the minimum number of first battery units for charging can also keep the battery safety within a certain level.

[0058] In an example of this embodiment, when there are multiple first battery cells, the difference between the voltage of the battery cell with the highest voltage among the multiple first battery cells and the voltage of the battery cell with the lowest voltage among the multiple first battery cells is less than the first threshold.

[0059] In the embodiment of the present application, if multiple battery cells are needed to charge the battery, the voltage value of each non-faulty battery cell can be determined first, and the battery cells with voltage values ​​close to or voltage differences within a preset threshold range can be selected as the battery cells for charging the battery. In this way, the state of each battery cell can be made basically consistent, the capacity and voltage balance of the synchronously discharged battery cells can be maintained, and the service life of these battery cells can be increased.

[0060] Step S13, controlling at least one first battery unit to charge the battery.

[0061] In one embodiment, controlling at least one first battery unit to charge a storage battery includes: controlling the direct current output by at least one battery unit to be stepped down by a voltage conversion circuit to charge the storage battery.

[0062] In this embodiment, since the voltage of the DC power output by the battery cells of the power battery is relatively high, the output DC power can be stepped down through a voltage control circuit, such as a DC-DC circuit. After the voltage is stepped down to an appropriate voltage range, it can be used to power the low-voltage battery to protect the safety of the low-voltage battery.

[0063] In the embodiment of the present application, each battery cell in the power battery can be finely controlled at the software level through algorithms or applications, and the first battery cell charges the battery. Alternatively, the battery cell can be controlled to charge the battery in the form of a hardware circuit or switch.

[0064] In this example, a method for preventing battery power supply of an electric vehicle is provided. When the power battery fails, the battery cells in the power battery that are in a non-faulty state can be determined, and at least one battery cell for powering the battery can be determined, and controlled to charge the battery. In this way, the low-voltage power supply of the electric vehicle can be guaranteed even when the power battery fails, so that the lighting system and the air-conditioning system can continue to work, meet the trial requirements in unsafe or cold scenes, and improve user experience and safety. At the same time, it can also solve the problem that after the power battery fails, the power in the battery pack cannot be fully utilized, and the battery still needs to be discharged during subsequent maintenance, resulting in a large waste of electricity.

[0065] In one example of the present embodiment, each battery cell in the power battery is provided with a bypass harness and a switching device, and the switching device is used to connect the battery cell or the bypass harness; controlling at least one first battery cell to charge the storage battery includes: controlling the switching device so that all battery cells other than the first battery cell in the power battery are bypassed; and controlling the power battery to charge the storage battery.

[0066] In one example, each battery cell in the power battery can be provided with a bypass harness for bypassing the battery so that it can work without being connected to the circuit when it is not needed. In this example, a switch device, such as a relay, can also be provided for each battery cell. The switch device can connect the corresponding battery cell based on the control of the vehicle controller to make the battery cell work, or the switch device can connect the bypass harness corresponding to the battery cell based on the control of the vehicle controller to make the battery cell not work. When controlling at least one battery cell to charge the storage battery, the faulty battery cell and other unselected battery cells can be bypassed through the switch device of each battery cell. Afterwards, the power battery that bypasses other battery cells is controlled to charge the storage battery.

[0067] In an example of this embodiment, after controlling at least one first battery cell to charge the storage battery, the method also includes: monitoring battery parameters of the storage battery and at least one first battery cell; when the power of the storage battery is greater than a second threshold, controlling at least one first battery cell to stop charging; when the power of any first battery cell is less than a third threshold, controlling at least one first battery cell to stop charging.

[0068] In one example, after controlling the first battery unit to charge the storage battery, the battery parameters of the storage battery and the first battery unit may be monitored all the time, such as voltage, temperature, internal resistance, etc. When the power of the storage battery is greater than a preset charging completion threshold or when the power of any battery unit in the first battery unit is less than a battery protection threshold of the battery unit, charging of the storage battery may be stopped.

[0069] In another example, when the temperature of the storage battery or any first battery cell is greater than a preset temperature threshold, charging may be stopped to avoid the risk of spontaneous combustion.

[0070] In an example of the present embodiment, after controlling at least one first battery unit to charge the battery, the method also includes: determining the low-voltage power usage state of the vehicle; when the vehicle is in a low-voltage power-off state and the battery charging is completed, controlling at least one first battery unit to stop charging; when the vehicle is in a low-voltage power-on state and the battery charging is completed, continuously monitoring the battery power parameters, and when the power parameters are less than a fourth threshold, re-executing the steps of selecting at least one first battery unit from the battery units in a non-fault state and controlling at least one first battery unit to charge the battery.

[0071] In this embodiment, after the vehicle's power battery fails, the controller can remind or warn the user through voice or instrumentation, informing the user that the vehicle's power battery has failed and that only the basic use needs of the in-vehicle electrical appliances can be maintained. In another example, the vehicle controller can obtain the total power of the battery cells and storage batteries in the power battery that are in a non-faulty state, as well as the current low-voltage power consumption of the vehicle, estimate how long the low-voltage power consumption of the electric vehicle can be maintained, and display the time, so that the user can make power consumption plans in advance and use power reasonably while waiting for rescue.

[0072] In this embodiment, the vehicle controller can obtain the low-voltage power consumption state of the vehicle. When there is no low-voltage equipment using electricity in the vehicle, that is, when the vehicle is in a low-voltage power-off state, after the battery is fully charged, the vehicle controller can control the first battery unit to stop charging the battery. When there is a low-voltage electrical equipment using electricity in the vehicle, that is, when the vehicle is in a low-voltage power-on state, after the battery is fully charged, the battery power parameters can be continuously monitored. When the battery power decreases again and reaches a certain preset threshold, the above steps S12 and S13 can be re-executed to charge the battery, so that the battery power is always maintained at a relatively safe level.

[0073] The present application also provides an electric vehicle battery charging system, such as Figure 2As shown, it includes: a power battery and a control unit, the power battery is connected to the battery charging port, and the electric vehicle battery charging system charges the battery through the battery charging port; the control unit is used to execute any step of the electric vehicle battery charging method in the electric vehicle battery charging method embodiment.

[0074] Optionally, each battery cell in the power battery is provided with a bypass harness and a switch device, and the switch device is used to connect the battery cell or the bypass harness.

[0075] Optionally, the system further includes a voltage conversion circuit, which is disposed between the power battery and the battery charging port and is used for reducing the voltage of the direct current output by the power battery and outputting it to the battery charging port.

[0076] The present application embodiment also provides an electronic device 300, such as Figure 3 As shown, the electronic device has a processor 301 and a memory 302, and the memory 302 stores computer instructions. When the computer instructions are executed by the processor 301, any one of the anti-power feeding method for the electric vehicle battery in the embodiments of the anti-power feeding method for the electric vehicle battery is implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0077] An embodiment of the present application also provides a storage medium on which computer instructions are stored. When the computer instructions are executed by a processor, any one of the above-mentioned anti-power feeding method embodiments of the electric vehicle battery is implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0078] Each embodiment in the present disclosure is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the device and equipment embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiments.

[0079] The above describes specific embodiments of the present disclosure. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the embodiments and still achieve the desired results. In addition, the processes depicted in the drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0080] The embodiments of the present disclosure may be systems, methods and / or computer program products. The computer program product may include a computer-readable storage medium carrying computer-readable program instructions for causing a processor to implement various aspects of the embodiments of the present disclosure.

[0081] A computer-readable storage medium may be a tangible device that can hold and store instructions used by an instruction execution device. A computer-readable storage medium may be, for example, but not limited to, an electrical storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination of the foregoing. More specific examples of computer-readable storage media (a non-exhaustive list) include: a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a static random access memory (SRAM), a portable compact disk read-only memory (CD-ROM), a digital versatile disk (DVD), a memory stick, a floppy disk, a mechanical encoding device, such as a punch card or a raised structure in a groove on which instructions are stored, and any suitable combination of the foregoing. As used herein, a computer-readable storage medium is not to be interpreted as a transient signal per se, such as a radio wave or other freely propagating electromagnetic wave, an electromagnetic wave propagating through a waveguide or other transmission medium (e.g., a light pulse through a fiber optic cable), or an electrical signal transmitted through a wire.

[0082] The computer-readable program instructions described herein can be downloaded from a computer-readable storage medium to each computing / processing device, or downloaded to an external computer or external storage device via a network, such as the Internet, a local area network, a wide area network, and / or a wireless network. The network can include copper transmission cables, optical fiber transmissions, wireless transmissions, routers, firewalls, switches, gateway computers, and / or edge servers. The network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards the computer-readable program instructions for storage in the computer-readable storage medium in each computing / processing device.

[0083] The computer program instructions for performing the operation of the embodiments of the present disclosure may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-related instructions, microcode, firmware instructions, state setting data, or source code or object code written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Smalltalk, C++, etc., and conventional procedural programming languages ​​such as "C" language or similar programming languages. Computer-readable program instructions may be executed completely on a user's computer, partially on a user's computer, as an independent software package, partially on a user's computer, partially on a remote computer, or completely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer via any type of network including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., using an Internet service provider to connect via the Internet). In some embodiments, an electronic circuit, such as a programmable logic circuit, a field programmable gate array (FPGA), or a programmable logic array (PLA), may be personalized by utilizing the state information of a computer-readable program instruction, and the electronic circuit may execute a computer-readable program instruction, thereby realizing various aspects of the embodiments of the present disclosure.

[0084] Various aspects of the embodiments of the present disclosure are described herein with reference to the flowcharts and / or block diagrams of the methods, devices (systems) and computer program products according to the embodiments of the present disclosure. It should be understood that each box in the flowchart and / or block diagram and the combination of each box in the flowchart and / or block diagram can be implemented by computer-readable program instructions.

[0085] These computer-readable program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, thereby producing a machine, so that when these instructions are executed by the processor of the computer or other programmable data processing device, a device that implements the functions / actions specified in one or more boxes in the flowchart and / or block diagram is generated. These computer-readable program instructions can also be stored in a computer-readable storage medium, and these instructions cause the computer, programmable data processing device, and / or other equipment to work in a specific manner, so that the computer-readable medium storing the instructions includes a manufactured product, which includes instructions for implementing various aspects of the functions / actions specified in one or more boxes in the flowchart and / or block diagram.

[0086] Computer-readable program instructions may also be loaded onto a computer, other programmable data processing apparatus, or other device so that a series of operating steps are performed on the computer, other programmable data processing apparatus, or other device to produce a computer-implemented process, thereby causing the instructions executed on the computer, other programmable data processing apparatus, or other device to implement the functions / actions specified in one or more boxes in the flowchart and / or block diagram.

[0087] The flowcharts and block diagrams in the accompanying drawings show the possible architecture, functions and operations of the systems, methods and computer program products according to multiple embodiments of the present disclosure. In this regard, each box in the flowchart or block diagram can represent a module, a program segment or a part of an instruction, and a part of a module, a program segment or an instruction contains one or more executable instructions for realizing the specified logical function. In some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or the flowchart, and the combination of the boxes in the block diagram and / or the flowchart can be implemented by a dedicated hardware-based system that performs the specified function or action, or can be implemented by a combination of dedicated hardware and computer instructions. It is well known to those skilled in the art that it is equivalent to implement it by hardware, implement it by software, and implement it by combining software and hardware.

[0088] The embodiments of the present disclosure have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A method for preventing power feeding of an electric vehicle battery, characterized in that: The electric vehicle comprises a power battery and a storage battery, and the method comprises: Determining a battery cell in the power battery that is in a non-faulty state; Determine at least one first battery cell among the battery cells in the non-fault state, wherein the first battery cell is used to supply power to the storage battery; The at least one first battery unit is controlled to charge the storage battery.

2. The method according to claim 1, characterized in that The total power of the at least one battery unit is greater than or equal to the power requirement of the battery; Before determining at least one first battery cell among the battery cells in the non-fault state, the method further includes: Collecting battery parameters of the battery; The power requirement of the battery is determined according to the battery parameters.

3. The method according to claim 1, characterized in that Each battery cell in the power battery is provided with a bypass harness and a switch device, and the switch device is used to connect the battery cell or the bypass harness; The controlling the at least one first battery unit to charge the storage battery comprises: Controlling the switch device so that all battery cells other than the first battery cell in the power battery are bypassed; Controlling the power battery to charge the storage battery.

4. The method according to claim 1, characterized in that When there are multiple first battery cells, a difference between a voltage of a battery cell with the highest voltage among the multiple first battery cells and a voltage of a battery cell with the lowest voltage among the multiple first battery cells is less than a first threshold.

5. The method according to claim 1, characterized in that The determining of the battery cells in the power battery that are in a non-faulty state comprises: Collecting battery parameters of each battery cell in the power battery; According to the battery parameters of each battery cell, the battery cells in the power battery that are in a non-faulty state are determined.

6. The method according to claim 1, characterized in that The controlling the at least one first battery unit to charge the storage battery comprises: The direct current outputted by the at least one battery unit is controlled to be stepped down by a voltage conversion circuit to charge the storage battery.

7. The method according to claim 6, characterized in that After controlling the at least one first battery unit to charge the storage battery, the method further includes: monitoring battery parameters of the battery and the at least one first battery cell; When the power level of the storage battery is greater than a second threshold, controlling the at least one first battery unit to stop charging; When the power level of any one of the first battery cells is less than a third threshold, the at least one first battery cell is controlled to stop charging.

8. The method according to claim 6, characterized in that After controlling the at least one first battery unit to charge the storage battery, the method further includes: Determine the low voltage power consumption status of the vehicle; When the vehicle is in a low-voltage power-down state and the battery is fully charged, controlling the at least one first battery unit to stop charging; When the vehicle is in a low-voltage power-on state and the battery is fully charged, the power parameter of the battery is continuously monitored, and when the power parameter is less than a fourth threshold, the steps of selecting at least one first battery cell from the battery cells in the non-fault state and controlling the at least one first battery cell to charge the battery are re-executed.

9. The method according to claim 1, characterized in that: The battery unit includes a battery cell or a battery module.

10. An electric vehicle battery charging system, characterized in that: include: A power battery and a control unit, wherein the power battery is connected to a battery charging port, and the electric vehicle battery charging system charges the battery through the battery charging port; The control unit is used to execute the steps of the method according to any one of claims 1 to 9.

11. The battery charging system according to claim 10, characterized in that: Each battery cell in the power battery is provided with a bypass harness and a switch device, and the switch device is used to connect the battery cell or the bypass harness.

12. The battery charging system according to claim 10, characterized in that: The system further includes a voltage conversion circuit, which is disposed between the power battery and the battery charging port and is used for reducing the voltage of the direct current output by the power battery and outputting it to the battery charging port.

13. An electronic device comprising a processor and a memory, wherein the memory stores computer instructions, and when the computer instructions are executed by the processor, the steps of the method according to any one of claims 1 to 9 are implemented.

14. A storage medium, characterized in that: Computer instructions are stored thereon, and when the computer instructions are executed by a processor, the steps of the method according to any one of claims 1 to 9 are implemented.

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