Battery pack insulation failure checking method, system and equipment

Abstract

The invention relates to the field of battery management, and provides a method for checking insulation failure of a battery pack, the battery pack comprises a plurality of battery modules which are connected in series in sequence, each battery module comprises a plurality of battery cells which are connected in series in sequence, and the method comprises the following steps: judging whether the battery pack has an insulation fault or not; when the battery pack has an insulation fault, judging an area where an insulation failure point of the battery pack is located; when the insulation failure point is located in the area where the battery modules of the battery pack are located, determining the battery module with an insulation fault in all the battery modules of the battery pack; obtaining the average voltage of the battery cells in the battery module with the insulation fault; according to the average voltage of the battery cells, the position of the battery cell with the insulation failure in the battery module is confirmed, the electric shock risk occurring in the insulation failure checking process of the battery pack is reduced, and the position of the insulation failure of the battery pack can be efficiently positioned; and meanwhile, hidden faults occurring at positions which cannot be observed by naked eyes can be positioned, and loss caused by blind disassembly is reduced.

Description

Technical Field

[0001] This invention relates to the field of battery management, and in particular to a method, system, and device for troubleshooting insulation failure in battery packs. Background Technology

[0002] With the increasing integration of battery packs and the widespread application of modular solutions, once a battery pack experiences insulation failure, it is necessary to rely on professional technicians to troubleshoot the battery insulation fault, and there is a risk of short circuit and electric shock during the troubleshooting process. Summary of the Invention

[0003] The purpose of this invention is to provide a method, system, and device for troubleshooting battery pack insulation failure, thereby reducing the risk of electric shock during the troubleshooting process and increasing the speed of locating battery insulation failure points.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a method for investigating insulation failure in a battery pack, the battery pack comprising multiple battery modules connected in series, each battery module comprising multiple battery cells connected in series, comprising the following steps: determining whether the battery pack has an insulation failure; when the battery pack has an insulation failure, determining the region where the insulation failure point of the battery pack is located; when the insulation failure point is located in the region where the battery modules of the battery pack are located, identifying the battery module with the insulation failure among all the battery modules of the battery pack; obtaining the average voltage of the battery cells in the battery module with the insulation failure; and determining the location of the battery cell with the insulation failure in the battery module based on the average voltage of the battery cells.

[0005] Further, determining whether the battery pack has an insulation fault includes: measuring the overall insulation resistance between the output terminal and the ground terminal of the battery pack when the high-voltage circuit of the battery pack is conducting; determining whether the overall insulation resistance is less than the required insulation resistance at the end of the battery pack's electrical cycle (EOL); when the overall insulation resistance is less than the required EOL, measuring the voltage between the output terminal and the ground terminal of the battery pack; and determining that the battery pack has an insulation fault when the voltage between the output terminal and the ground terminal is greater than zero.

[0006] Further, determining the region where the insulation failure point of the battery pack is located includes: measuring the overall insulation resistance value between the output terminal and the ground terminal of the battery pack when the high-voltage circuit of the battery pack is disconnected; determining whether the overall insulation resistance value is greater than the required insulation resistance value for the battery pack's end-of-life (EOL); when the overall insulation resistance value is greater than the required insulation resistance value for the battery pack's EOL, determining that the insulation failure point is located in the region where the battery module of the battery pack is located; when the overall insulation resistance value is less than the required insulation resistance value for the battery pack's EOL, determining that the insulation failure point is located in the electrical region of the battery pack.

[0007] Furthermore, after determining the region where the insulation failure point of the battery pack is located, the following steps are also included: when the insulation failure point is located in the electrical region of the battery pack, the working status of the battery energy distribution unit, high-voltage copper busbar and connector in the electrical region is checked.

[0008] Furthermore, the step of confirming that a battery module with an insulation fault has occurred among all the battery modules of the battery pack includes: disconnecting the connection between the battery modules; measuring the module insulation resistance value between the output terminal of all the battery modules of the battery pack and the ground terminal of the battery pack; and identifying the battery module whose module insulation resistance value is less than the EOL offline insulation resistance requirement value of the battery pack as the battery module with an insulation fault.

[0009] Further, obtaining the average voltage of the cells in the battery module with the insulation fault includes: measuring the total voltage V of the battery module with the insulation fault. B ; Obtain the number N of the battery cells in the battery module; Based on the total voltage V of the battery module B Calculate the average voltage V of the cells in the battery module where an insulation fault occurs, based on the number N of the cells. c .

[0010] Furthermore, determining the location of the cell with an insulation fault within the battery module based on the average voltage of the cell includes: measuring the voltage V between the negative terminal of the battery module with the insulation fault and the ground terminal of the battery pack. ab According to voltage V ab and average voltage V c Calculate the location of the cell where the insulation fault occurred.

[0011] Furthermore, after confirming the location of the cell with insulation failure in the battery module based on the average voltage of the cell, the method further includes the following steps: removing the cell with insulation failure; determining whether the cell's outer casing is damaged, whether the electrolyte in the cell has leaked out, and whether the cell's casing is deformed.

[0012] On the other hand, a system for investigating insulation failure in a battery pack is provided, comprising: a battery pack insulation judgment module for judging whether the battery pack has an insulation failure; a failure point judgment module for judging the area where the insulation failure point of the battery pack is located when the battery pack has an insulation failure; a battery module judgment module for judging the battery modules in all the battery packs that have insulation failures when the insulation failure point is located in the area where the battery modules of the battery pack are located; a voltage acquisition module for acquiring the average voltage of the cells in the battery modules that have insulation failures; and a cell location judgment module for determining the location of the cells that have insulation failures in the battery modules based on the average voltage of the cells.

[0013] On the other hand, an electronic device is provided, comprising: a processor and a memory for storing executable instructions of the processor; wherein the processor is configured to perform the investigation method described in any of the preceding claims.

[0014] Analysis shows that the present invention discloses a method, system and equipment for troubleshooting battery pack insulation failure. The present invention reduces the risk of electric shock during the troubleshooting process of battery pack insulation failure, and can efficiently locate the location of insulation failure in the battery pack; at the same time, it can locate hidden faults that cannot be observed with the naked eye, reducing the losses caused by blind disassembly. Attached Figure Description

[0015] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. Wherein:

[0016] Figure 1 A schematic diagram of the internal structure of a battery module according to an embodiment of the present invention.

[0017] Figure 2 A schematic diagram of the area of ​​a battery module according to an embodiment of the present invention.

[0018] Figure 3 A schematic diagram of a cell insulation fault judgment method according to an embodiment of the present invention.

[0019] Figure 4 A flowchart of an embodiment of the present invention. Detailed Implementation

[0020] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. Various examples are provided by way of explanation and not by way of limitation. Indeed, those skilled in the art will recognize that modifications and variations can be made to the invention without departing from its scope or spirit. For example, a feature shown or described as part of one embodiment may be used in another embodiment to produce yet another embodiment. Therefore, it is desirable that the invention encompass such modifications and variations falling within the scope of the appended claims and their equivalents.

[0021] In the description of this invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and do not require the invention to be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on the invention. The terms "connected," "linked," and "set up" used in this invention should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a direct connection or an indirect connection through intermediate components; a wired connection, a radio connection, or a wireless communication signal connection. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0022] The accompanying drawings illustrate one or more examples of the invention. The detailed description uses numerals and letters to refer to features in the drawings. Similar or analogous reference numerals in the drawings and description have been used to refer to similar or analogous parts of the invention. As used herein, the terms “first,” “second,” “third,” and “fourth,” etc., are used interchangeably to distinguish one component from another and are not intended to indicate the location or importance of a single component.

[0023] As shown in the figure, according to an embodiment of the present invention, a method for troubleshooting insulation failure of a battery pack is provided. The battery pack includes multiple battery modules connected in series, and each battery module includes multiple battery cells connected in series.

[0024] Specifically, such as Figure 1As shown, the battery pack connector has two output terminals, namely the P+ interface and the P- interface. The battery's interior contains an electrical area and a battery module area. The connector is connected to the electrical area via a high-voltage copper busbar. All battery modules are connected in series, and the two ends of each series-connected battery module are connected to the electrical area via high-voltage copper busbars. Each battery module contains multiple cells connected in series. The aforementioned electrical area typically includes a Battery Distribution Unit (BDU), which is connected to the connector via a high-voltage copper busbar. The high-voltage copper busbar connected to the electrical area is also part of the electrical area. Typically, the total positive and negative terminals of the battery modules are connected to the total positive and negative terminals of the BDU via the high-voltage copper busbar. The BDU controls the circuit's on / off state, and finally, the P+ and P- interfaces of the connector supply power or charge to an external load.

[0025] Includes the following steps:

[0026] Step S101: Determine if there is an insulation fault in the battery pack; Step S102: When there is an insulation fault in the battery pack, determine the area where the insulation failure point of the battery pack is located; Step S103: When the insulation failure point is located in the area where the battery modules of the battery pack are located, confirm the battery module with the insulation fault among all the battery modules of the battery pack; Step S104: Obtain the average voltage of the cells in the battery module with the insulation fault; Step S105: Confirm the location of the cell with the insulation fault in the battery module based on the average voltage of the cells.

[0027] First, regarding step S101, the above-mentioned determination of whether the battery pack has an insulation fault includes: with the high-voltage circuit of the battery pack conducting, measuring the overall insulation resistance value between the output terminal and the ground terminal of the battery pack; determining whether the overall insulation resistance value is less than the EOL (End of Line) insulation resistance requirement value of the battery pack; when the overall insulation resistance value is less than the EOL insulation resistance requirement value of the battery pack, measuring the voltage value between the output terminal and the ground terminal of the battery pack; when the voltage value between the output terminal and the ground terminal of the battery pack is greater than zero, determining that the battery pack has an insulation fault.

[0028] Specifically, during battery pack operation, such as charging or discharging, the insulation resistance between the positive / negative output terminals and ground is measured using an insulation resistance tester. This insulation resistance is then compared to the required insulation resistance at the end of the battery pack's lifespan (EOL). If the resistance is lower than this value, it indicates a risk of insulation failure. This step confirms the presence of insulation failure by checking the overall insulation resistance of the battery pack. If an insulation failure is found, the area location process is initiated.

[0029] Regarding step S102, determining the region where the insulation failure point of the battery pack is located includes: measuring the overall insulation resistance value between the output terminal and the ground terminal of the battery pack when the high-voltage circuit of the battery pack is disconnected; determining whether the overall insulation resistance value is greater than the required insulation resistance value at the end of the battery pack's EOL (End of Line); when the overall insulation resistance value is greater than the required insulation resistance value at the end of the battery pack's EOL, determining that the insulation failure point is located in the region where the battery module of the battery pack is located; when the overall insulation resistance value is less than the required insulation resistance value at the end of the battery pack's EOL, determining that the insulation failure point is located in the electrical region of the battery pack.

[0030] Specifically, when investigating insulation failure areas in a battery pack, the first step is to disconnect the high-voltage circuit. Disconnecting the high-voltage circuit can be understood as disconnecting the relays connected to the battery pack. The relays are located within the battery energy distribution unit. When the relays are open, the external interface of the battery pack is not connected to the battery module, meaning the external interface is not energized. When the relays are closed, the entire battery pack circuit becomes conductive, and the external interface becomes energized, enabling charging and discharging. After disconnection, the insulation resistance between the positive / negative output terminals and the ground terminal of the battery pack is measured again using a resistance tester or similar equipment. The overall insulation resistance value is then compared to the battery pack's EOL (End-of-Life) insulation resistance requirement. If the overall insulation resistance value is less than the EOL requirement, the failure point is located in the electrical area; if the overall insulation resistance value is greater than the EOL requirement, the failure point is located inside the battery module. This is because when the relays are open, the electrical area and the battery module are actually not connected, and the two areas are independent and do not affect each other. At this point, the insulation resistance between the battery pack's output terminal and ground terminal is measured. The actual test measures the insulation between the electrical area and the ground terminal. If the measured overall insulation resistance is less than the battery pack's EOL (End-of-Line) insulation resistance, the insulation failure point is considered to be located in the electrical area. Conversely, if it is greater, the insulation failure point is considered to be located in the module area. Furthermore, in reality, the overall insulation resistance will not equal the battery pack's EOL requirement. For example, if the EOL requirement is set at 50MΩ, the overall insulation resistance may be much smaller (around 0.1MΩ) if insulation failure occurs, and much larger (hundreds of MΩ or thousands of MΩ or more) if insulation is normal; the two are not on the same order of magnitude. This step, by switching the conduction state of the battery pack's high-voltage circuit, identifies the area within the battery pack where insulation failure has occurred, significantly shortening the fault diagnosis path. In actual diagnosis, if insulation failures occur simultaneously in both the battery module area and the electrical area, it is equivalent to a short circuit, causing battery pack burning or fire. The symptoms are obvious, and there is no need to measure the insulation resistance value for diagnosis.

[0031] The following steps are included after step S102: when the insulation failure point is located in the electrical area of ​​the battery pack, check the working status of the battery energy distribution unit, high voltage copper busbar and connector in the electrical area.

[0032] Specifically, for the battery energy distribution unit, check whether the casing of the battery energy distribution unit is damaged, whether the internal high-voltage copper busbar is in contact with other conductive parts, and whether water has entered; for the high-voltage copper busbar, check whether the insulation layer of the high-voltage copper busbar is damaged and whether the exposed part of the high-voltage copper busbar is in contact with other conductive parts; for the connector, check whether the connector shell is damaged and whether the exposed part of the connector copper busbar is in contact with other conductive parts.

[0033] Regarding step S103, determining which battery modules in the battery pack have insulation faults includes: disconnecting the connections between the battery modules; measuring the module insulation resistance value between the output terminal of all battery modules in the battery pack and the ground terminal of the battery pack; and classifying battery modules whose module insulation resistance value is less than the EOL (Even After the End of Life) insulation resistance requirement of the battery pack as battery modules with insulation faults.

[0034] Specifically, when testing battery modules, first disconnect the high-voltage copper busbars between all battery modules to ensure that each module is electrically independent. Measure the insulation resistance between the positive and negative terminals of each battery module and the battery pack grounding terminal using equipment such as a resistance tester; then measure the insulation resistance of each battery module sequentially. Battery modules whose insulation resistance is less than the battery pack's EOL (End-of-Life) insulation resistance requirement are considered to have insulation faults.

[0035] Regarding step S104, obtaining the average voltage of the cells in the battery module with the insulation fault includes: measuring the total voltage V of the battery module with the insulation fault. B ; Obtain the number N of battery cells in the battery module; Based on the total voltage V of the battery module B Calculate the average voltage V of the cells in the battery module where insulation failure occurs, based on the number of cells N. c In the specific testing process, the voltage of the battery module is usually measured using equipment such as a multimeter, and the number of cells N can usually be confirmed by visual inspection.

[0036] Insulation faults in battery cells generally manifest as blue film damage and electrolyte leakage. Blue film damage refers to the breakage of the insulating layer covering the cell casing, allowing the cell casing to contact the grounding terminal and causing insulation failure. In this case, the cell voltage and resistance will be no different from a normal cell. Electrolyte leakage refers to damage to the cell casing or terminals, resulting in electrolyte leakage and causing the cell casing to contact the grounding terminal, also causing insulation failure. In this case, the cell voltage and internal resistance may or may not change, depending on the integrity of the cell's internal structure.

[0037] Regarding step S105, determining the location of the cell with an insulation fault within the battery module based on the average voltage of the cell includes: measuring the voltage V between the negative terminal of the battery module with the insulation fault and the ground terminal of the battery pack. ab According to voltage V ab and average voltage V c Calculate the location of the cell with the insulation fault. V ab / V C =S, where S is the location of the cell with the insulation fault. Specifically, the location of the cell with the insulation fault refers to its position in the series of cells connected in series. For example, when S is 3, the third cell with the insulation fault is the one starting from the negative terminal of all the cells connected in series.

[0038] For example, in a module consisting of 10 battery cells, if the insulation of the 5th string of cells fails, the specific connection situation is that the casing of the 5th string of cells (i.e., the casing is conductive to the positive terminal of the cell, and the casing is positively charged) is conductive to the ground terminal. In this case, when using a multimeter to measure the connection between the negative terminal and the ground terminal of the battery module, the actual voltage (V) will be... ab The measurement is made of the voltage between the positive terminal of the 5th cell and the negative terminal of the module, and then the average voltage V is used. c By dividing by the phase, the location S of the cell with the insulation fault can be obtained.

[0039] Furthermore, after confirming the location of the cell with insulation failure within the battery module based on the average voltage of the cells, the following steps are also included: checking whether the insulating pads at the contact points between the cell and the bracket / box are damaged or deformed, causing metal conduction; checking whether the insulating pads at the contact areas between the bottom and sides of the cell and the metal bracket are damaged or deformed, causing metal conduction; checking whether there are electrolyte leakage points in the cell. If the cell casing is not properly sealed, electrolyte leakage will corrode the insulation layer. Typically, the focus is on checking for liquid residue near the cell sealing adhesive and explosion-proof valve. Then, the cell with insulation failure is removed; it is determined whether the cell casing is damaged, whether electrolyte has leaked, and whether the cell casing is deformed.

[0040] This invention also discloses a system for troubleshooting battery pack insulation failure, comprising:

[0041] The battery pack insulation detection module determines whether the battery pack has an insulation fault. This determination includes: with the high-voltage circuit of the battery pack conducting, measuring the overall insulation resistance between the battery pack's output terminal and its ground terminal; determining whether the overall insulation resistance is less than the required EOL (End of Line) insulation resistance; when the overall insulation resistance is less than the required EOL insulation resistance, measuring the voltage between the battery pack's output terminal and its ground terminal; and determining that the battery pack has an insulation fault when the voltage between the battery pack's output terminal and its ground terminal is greater than zero.

[0042] The failure point detection module determines the region where the battery pack's insulation failure point is located when an insulation fault exists. This determination includes: measuring the overall insulation resistance between the battery pack's output terminal and ground terminal with the high-voltage circuit disconnected; determining if the overall insulation resistance exceeds the battery pack's end-of-life (EOL) insulation resistance requirement; if the overall insulation resistance exceeds the EOL insulation resistance requirement, the insulation failure point is located in the area where the battery module is located; if the overall insulation resistance is less than the EOL insulation resistance requirement, the insulation failure point is located in the battery pack's electrical region.

[0043] The battery module identification module identifies battery modules with insulation failures when the insulation failure point is located in the area where the battery modules of the battery pack are located. Identifying battery modules with insulation failures in all battery packs includes: disconnecting the connections between battery modules; measuring the module insulation resistance value between the output terminal of all battery modules and the ground terminal of the battery pack; and identifying battery modules with insulation resistance values ​​less than the EOL (End-of-Life) insulation resistance requirement of the battery pack as having insulation failures.

[0044] The voltage acquisition module acquires the average voltage of the cells within the battery module experiencing insulation failure. Acquiring the average voltage of the cells within the battery module experiencing insulation failure includes measuring the total voltage V of the battery module experiencing insulation failure. B ; Obtain the number N of battery cells in the battery module; Based on the total voltage V of the battery module B Calculate the average voltage V of the cells in the battery module where insulation failure occurs, based on the number of cells N. c In the specific testing process, the voltage of the battery module is usually measured using equipment such as a multimeter, and the number of cells N can usually be confirmed by visual inspection.

[0045] The cell location detection module identifies the location of cells with insulation faults within the battery module based on their average voltage. This identification involves measuring the voltage V between the negative terminal of the faulty battery module and the grounding terminal of the battery pack. ab According to voltage V ab and average voltage V c Calculate the location of the cell with the insulation fault. V ab / V C =S, where S is the location of the cell with the insulation fault. Specifically, the location of the cell with the insulation fault refers to its position in the series of cells connected in series. For example, when S is 3, the cell with the insulation fault is the third cell starting from the positive terminal of all the cells connected in series.

[0046] The present invention also discloses an electronic device, comprising: a processor and a memory for storing executable instructions of the processor; wherein the processor is configured to execute the above-described troubleshooting method.

[0047] This invention achieves the location of insulation failure in the battery pack through a series of emission methods, avoiding disassembly of the battery before locating the battery module area. Furthermore, when locating the fault of a specific cell, it locates the fault first and then disassembles it, reducing the workload of fault handling. By determining the fault location through calculation, it is easier to detect battery packs in locations that are difficult to disassemble.

[0048] As can be seen from the above description, the above embodiments of the present invention achieve the following technical effects: the present invention reduces the risk of electric shock during the investigation of insulation failure of battery packs, and can efficiently locate the location where insulation failure of battery packs occurs; at the same time, it can locate hidden faults that cannot be observed by the naked eye, reducing the losses caused by blind disassembly.

[0049] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for troubleshooting insulation failure in a battery pack, the battery pack comprising multiple battery modules connected in series, each battery module comprising multiple battery cells connected in series, characterized in that, Includes the following steps: Determine whether the battery pack has an insulation fault; When the battery pack has an insulation fault, determine the area where the insulation failure point of the battery pack is located; When the insulation failure point is located in the area where the battery module of the battery pack is located, it is confirmed that the battery module with insulation failure has occurred in all the battery modules of the battery pack. Obtain the average voltage of the cells in the battery module where the insulation fault has occurred; The location of the cell with an insulation fault within the battery module is determined based on the average voltage of the cell.

2. The method for troubleshooting insulation failure in a battery pack according to claim 1, characterized in that, The determination of whether the battery pack has an insulation fault includes: With the high-voltage circuit of the battery pack in the conducting state, measure the insulation resistance value of the entire battery pack between the output terminal and the ground terminal of the battery pack. Determine whether the overall insulation resistance value is less than the required insulation resistance value at the end of the battery pack's EOL period; When the insulation resistance value of the entire battery pack is less than the required insulation resistance value at the end of the EOL of the battery pack, measure the voltage value between the output terminal of the battery pack and the ground terminal of the battery pack. When the voltage between the output terminal and the ground terminal of the battery pack is greater than zero, it is determined that the battery pack has an insulation fault.

3. The method for troubleshooting insulation failure in a battery pack according to claim 1, characterized in that, The region where the insulation failure point of the battery pack is located includes: With the high-voltage circuit of the battery pack disconnected, measure the insulation resistance value of the entire battery pack between the output terminal and the ground terminal of the battery pack. Determine whether the overall insulation resistance value of the battery pack is greater than the required insulation resistance value at the end of the EOL period of the battery pack; When the insulation resistance value of the entire pack is greater than the required insulation resistance value for the EOL (End of Life) of the battery pack, it is determined that the insulation failure point is located in the area where the battery module of the battery pack is located. When the overall insulation resistance value is less than the required insulation resistance value for the battery pack's EOL (Effective Opening) stage, it is determined that the insulation failure point is located in the electrical region of the battery pack.

4. The method for troubleshooting battery pack insulation failure according to claim 3, characterized in that, After determining the region where the insulation failure point of the battery pack is located, the following steps are also included: When the insulation failure point is located in the electrical area of ​​the battery pack, check the working status of the battery energy distribution unit, high-voltage copper busbar and connector in the electrical area.

5. The method for troubleshooting insulation failure in a battery pack according to claim 1, characterized in that, The battery modules for which an insulation fault is confirmed in all battery modules of the battery pack include: Disconnect the connections between the battery modules; Measure the module insulation resistance value between the output terminal of all battery modules in the battery pack and the ground terminal of the battery pack; A battery module whose insulation resistance value is less than the EOL (Effective Opening) insulation resistance requirement of the battery pack is considered to have an insulation fault.

6. The method for troubleshooting insulation failure in a battery pack according to claim 1, characterized in that, The process of obtaining the average voltage of the cells within the battery module experiencing the insulation fault includes: Measure the total voltage V of the battery module that experienced the insulation fault. B ; Obtain the number N of the battery cells in the battery module; According to the total voltage V of the battery module B Calculate the average voltage V of the cells in the battery module where an insulation fault occurs, based on the number N of the cells. c .

7. The method for troubleshooting battery pack insulation failure according to claim 1, characterized in that, The step of determining the location of the cell with an insulation fault within the battery module based on the average voltage of the cell includes: Measure the voltage V between the negative terminal of the battery module with the insulation fault and the ground terminal of the battery pack. ab ; According to voltage V ab and average voltage V c Calculate the location of the cell where the insulation fault occurred.

8. The method for troubleshooting insulation failure in a battery pack according to claim 1, characterized in that, After determining the location of the cell with an insulation fault within the battery module based on the average voltage of the cell, the method further includes the following step: Remove the battery cell that has an insulation fault; Determine whether the outer casing of the battery cell is damaged, whether the electrolyte in the battery cell has leaked out, and whether the casing of the battery cell is deformed.

9. A system for investigating insulation failure in battery packs, characterized in that, include: A battery pack insulation detection module determines whether the battery pack has an insulation fault. The failure point determination module determines the area where the insulation failure point of the battery pack is located when the battery pack has an insulation fault. The battery module judgment module determines all battery modules in the battery pack that have insulation failures when the insulation failure point is located in the area where the battery module is located in the battery pack. The voltage acquisition module acquires the average voltage of the cells in the battery module where the insulation fault has occurred. The cell location determination module determines the location of the cell with an insulation fault within the battery module based on the average voltage of the cell.

10. An electronic device, characterized in that, The electronic device includes: a processor and a memory for storing executable instructions of the processor; The processor is configured to perform the investigation method according to any one of claims 1-8.

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