Battery pack module connection copper bar insulation fault determination method, device and equipment

Abstract

The invention discloses a battery pack module connection copper bar insulation fault determination method, device and equipment, and relates to the technical field of new energy automobile intelligent detection, and the method comprises the steps: carrying out the insulation resistance detection of a battery pack based on an insulation resistance test value of the battery pack which is always opposite to a battery pack box body, and achieving the detection whether the insulation performance of the battery pack is qualified or not; according to the detection result and when the qualified detection is not passed, sequentially detecting to obtain the voltage between each copper bar and the battery pack box body; and based on the voltage detection result of each copper bar, judging whether the copper bar has a fault, and determining a fault copper bar. According to the invention, the faulty copper bar can be accurately positioned, blind disassembly and troubleshooting are reduced, and the troubleshooting efficiency is improved.

Description

Technical Field

[0001] The present application relates to the field of intelligent detection technology for new energy vehicles, and specifically to a method, device and equipment for determining insulation faults of copper bars connected to battery pack modules. Background Art

[0002] The power battery pack is the core component of new energy vehicles, which is used to provide a power source for the car. The battery pack consists of several battery modules connected in series, and the copper busbar and bolt connection method can achieve simple, convenient and fast connection. The copper busbar itself is coated with a layer of insulating paint or wrapped by other insulating materials, and bolt connection holes are left at both ends. During the material supply and installation process, the surface insulating paint or insulating layer of the copper busbar is easily scratched, or the insulating paint or insulating layer is damaged due to the small gap being squeezed by the box or other modules, resulting in insulation failure. Once the insulation of the copper busbar deteriorates, the damaged part may contact the battery pack box or other module shells, which will cause fatal damage to the safety of the battery pack. In severe cases, it may even cause a local short circuit of the module and the battery pack box to be charged, posing a major safety hazard. In the battery pack assembly process, prevention is carried out through incoming material inspection, but it is difficult to avoid the above situation 100%. Once the above copper busbar is damaged, it is necessary to check the connecting copper busbar, wiring harness, etc. one by one, and the inspection progress is slow, affecting production and posing a threat to personnel safety.

[0003] Therefore, it is very important to test the insulation of the battery pack. At present, the insulation test of the battery pack is carried out after the power battery is assembled. The insulation resistance of the total positive and total negative of the power battery pack to the box shell is tested separately to determine whether the overall insulation of the battery pack is qualified. If the tested insulation resistance is too small and lower than the theoretical design value, it can be judged that the insulation performance of the battery pack is unqualified. However, this insulation test method can only determine whether there is a fault phenomenon and that the insulation of the battery pack is unqualified, and it cannot specifically determine whether there is a fault in the connecting copper bus or the insulation of the line. Summary of the invention

[0004] The present application provides a method, device and equipment for determining insulation faults of copper busbars connected to battery pack modules, which can accurately locate faulty copper busbars, reduce blind disassembly and troubleshooting, and improve troubleshooting efficiency.

[0005] In a first aspect, an embodiment of the present application provides a method for determining insulation failure of a copper busbar connected to a battery pack module, the method comprising:

[0006] Based on the insulation resistance test value of the battery pack against the battery pack box, the battery pack insulation resistance test is performed to detect whether the battery pack insulation is qualified;

[0007] According to the test results and when the qualified test fails, the voltage between each copper bar and the battery pack box is tested in turn;

[0008] Based on the voltage detection results of each copper busbar, it is determined whether the copper busbar is faulty, and the faulty copper busbar is identified.

[0009] In combination with the first aspect, in one implementation, before performing the battery pack insulation resistance detection, the method further includes:

[0010] Based on the battery pack design requirements, test parameters are set when testing the insulation resistance of the battery pack, and the test parameters include test voltage, test time, and insulation resistance qualified value range.

[0011] In combination with the first aspect, in one implementation, the battery pack insulation resistance test is performed based on the insulation resistance test value of the battery pack facing the battery pack box to detect whether the insulation of the battery pack is qualified, specifically including:

[0012] Connect the positive pole of the test line of the resistance detection equipment to the positive pole of the battery pack, and the negative pole of the test line to the battery pack box. Perform the insulation resistance test of the battery pack according to the set test parameters to obtain the insulation resistance test value.

[0013] Based on the insulation resistance test value obtained by detection, it is possible to determine whether the insulation of the battery pack has passed the test.

[0014] In combination with the first aspect, in one implementation, the determination of whether the insulation of the battery pack is qualified based on the insulation resistance test value obtained by detection specifically includes:

[0015] If the insulation resistance test value obtained by the test is within the qualified insulation resistance value range and greater than the standard value, the battery pack insulation test is qualified;

[0016] If the insulation resistance test value obtained is not greater than the standard value, the battery pack insulation test fails, indicating that the battery pack insulation is faulty.

[0017] In combination with the first aspect, in one implementation, sequentially detecting and obtaining the voltage between each copper busbar and the battery pack body specifically includes:

[0018] Touch the negative pole of the multimeter to the box, and the positive pole of the multimeter to the copper bars of the battery pack in turn, and detect the voltage between each copper bar and the battery pack box.

[0019] In combination with the first aspect, in one implementation, judging whether the copper busbar is faulty based on the voltage detection results of each copper busbar and determining the faulty copper busbar specifically includes:

[0020] The voltages between the copper bars and the battery pack box are obtained in sequence, and the current voltage between the copper bar and the battery pack box is judged:

[0021] If the current voltage between the copper busbar and the battery pack box is a multiple of the standard voltage of a single battery pack module, then check for other battery pack faults;

[0022] If the voltage between the current copper busbar and the battery pack body is 0, it is determined that the current copper busbar is faulty and the insulation fails.

[0023] In combination with the first aspect, in one implementation, after determining that the current copper busbar is faulty and the insulation fails, the method further includes:

[0024] Replace all faulty copper bars, and then retest the insulation resistance of the battery pack against the battery pack case, as well as the voltage between each copper bar and the battery pack case.

[0025] In a second aspect, an embodiment of the present application provides a battery pack module connection copper bar insulation fault determination device, the battery pack module connection copper bar insulation fault determination device comprising:

[0026] The first test module is used to perform a battery pack insulation resistance test based on the insulation resistance test value of the battery pack against the battery pack box to detect whether the insulation of the battery pack is qualified;

[0027] The second test module is used to detect the voltage between each copper bar and the battery pack box in sequence according to the test results and when the qualified test fails;

[0028] The judgment module is used to judge whether the copper busbar is faulty based on the voltage detection results of each copper busbar, and determine the faulty copper busbar.

[0029] In combination with the second aspect, in one implementation, the battery pack insulation resistance test is performed based on the insulation resistance test value of the battery pack facing the battery pack box to detect whether the insulation of the battery pack is qualified, specifically including:

[0030] Based on the battery pack design requirements, test parameter settings are performed when the battery pack insulation resistance is detected, wherein the test parameters include test voltage, test time, and insulation resistance qualified value range;

[0031] Connect the positive pole of the test line of the resistance detection equipment to the positive pole of the battery pack, and the negative pole of the test line to the battery pack box. Perform the insulation resistance test of the battery pack according to the set test parameters to obtain the insulation resistance test value.

[0032] Based on the insulation resistance test value obtained by detection, it is possible to determine whether the insulation of the battery pack has passed the test.

[0033] In a third aspect, an embodiment of the present application provides a device for determining the insulation fault of a copper busbar connected to a battery pack module, the device comprising a processor, a memory, and a program for determining the insulation fault of a copper busbar connected to a battery pack module stored in the memory and executable by the processor, wherein when the program for determining the insulation fault of a copper busbar connected to a battery pack module is executed by the processor, the steps of the method for determining the insulation fault of a copper busbar connected to a battery pack module described above are implemented.

[0034] The beneficial effects brought by the technical solution provided in the embodiments of the present application include:

[0035] By testing the insulation resistance of the battery pack based on the insulation resistance test value of the battery pack facing the battery pack box, the insulation of the battery pack can be tested to see if it is qualified. Then, according to the test results and when the qualified test fails, the voltage between each copper busbar and the battery pack box is tested in turn. Then, based on the voltage test results of each copper busbar, it is judged whether the copper busbar is faulty and the faulty copper busbar is determined. The faulty copper busbar can be accurately located, and blind disassembly and troubleshooting are avoided, thereby improving the troubleshooting efficiency. It also has safety guidance and operability. After the faulty copper busbar is found, it is replaced immediately to solve the fault. At the same time, the risk of module damage during the insulation test of each module is reduced to ensure product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 A flow chart of a method for determining insulation fault of a copper busbar connected to a battery pack module of the present application;

[0037] Figure 2 This is a functional module diagram of a device for determining insulation faults of a copper busbar connected to a battery pack module of the present application;

[0038] Figure 3 This is a schematic diagram of the hardware structure of the copper busbar insulation fault determination device connected to the battery pack module of this application. DETAILED DESCRIPTION

[0039] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0040] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0041] On the first aspect, an embodiment of the present application provides a method for determining the insulation fault of a copper busbar connected to a battery pack module. The insulation resistance detection of the battery pack is combined with the voltage measurement between the copper busbar and the battery pack case by a multimeter according to the physical and electrochemical characteristics of the power battery, thereby forming a new fault troubleshooting method. By performing insulation resistance detection on the battery pack and voltage detection between the copper busbar and the battery pack case, the faulty copper busbar can be accurately located, thereby improving troubleshooting efficiency, while reducing the risk of secondary damage to the module during the troubleshooting process, thereby saving development costs.

[0042] In one embodiment, referring to Figure 1 , Figure 1 This is a flow chart of the method for determining insulation fault of the copper busbar connected to the battery pack module of this application. Figure 1 As shown, the method for determining the insulation fault of the copper busbar connected to the battery pack module includes:

[0043] S1: Based on the insulation resistance test value of the battery pack facing the battery pack case, the battery pack insulation resistance is tested to detect whether the battery pack insulation is qualified; that is, firstly the insulation resistance test value of the battery pack facing the battery pack case is tested to detect whether the battery pack insulation is qualified.

[0044] Furthermore, in one embodiment, before performing the battery pack insulation resistance test, it also includes: based on the battery pack design requirements, setting test parameters when performing the battery pack insulation resistance test, the test parameters include test voltage, test time, and insulation resistance qualified value range.

[0045] In this application, the insulation resistance test of the battery pack is performed based on the insulation resistance test value of the battery pack against the battery pack box to detect whether the insulation of the battery pack is qualified, specifically including:

[0046] S101: Connect the positive electrode of the test line of the resistance detection device to the positive terminal of the battery pack, and connect the negative electrode of the test line to the battery pack box, and perform the insulation resistance test of the battery pack according to the set test parameters to obtain the insulation resistance test value;

[0047] S102: Based on the insulation resistance test value obtained by detection, determine whether the insulation of the battery pack has passed the test.

[0048] For the method for determining insulation fault of the copper busbar connected to the battery pack module of the present application, first determine whether the insulation performance of the battery pack is qualified. Specifically, use a resistance detection device, such as a multimeter, and set specific test parameters such as test voltage, test time, and qualified insulation resistance value range according to the design requirements of the battery pack. Then: connect the positive pole of the test line of the resistance detection device to the total positive of the battery pack, and connect the negative pole of the test line of the resistance detection device to the battery pack box. After the line connection is complete, start the test, and determine whether the insulation of the battery pack is qualified based on the insulation resistance test value obtained from the test. If the insulation resistance test value obtained from the test meets the requirements, it means that the insulation of the battery pack is qualified. If the insulation resistance test value obtained from the test does not meet the requirements, it means that the insulation of the battery pack is faulty and the cause of the fault needs to be investigated.

[0049] Further, in one embodiment, based on the insulation resistance test value obtained by detection, determining whether the insulation of the battery pack is qualified is implemented, specifically including:

[0050] If the insulation resistance test value obtained by the test is within the qualified insulation resistance value range and greater than the standard value, the battery pack insulation test is qualified;

[0051] If the insulation resistance test value obtained is not greater than the standard value, the battery pack insulation test fails, indicating that the battery pack insulation is faulty.

[0052] Specifically, when the power battery is assembled off the production line, the insulation resistance of the battery pack is first tested. If the insulation resistance test value of the battery pack facing the battery pack box is within the normal range and the insulation resistance test value is greater than the standard value, it indicates that the insulation of the battery pack is normal. If the insulation resistance test value of the battery pack facing the battery pack box is significantly lower than the standard value, the insulation of the battery pack to the box is insufficient, and it is necessary to test the voltage between the copper busbar and the battery pack box for further troubleshooting. Otherwise, the safety requirements cannot be met.

[0053] It should be noted that during the troubleshooting process, the operator needs to wear high-voltage insulating gloves throughout the process and the tools must be insulating to avoid local short circuits during the operation and cause harm to the operator and the battery pack.

[0054] S2: According to the test results and when the qualified test fails, the voltage between each copper busbar and the battery pack box is tested in sequence;

[0055] Furthermore, in one embodiment, the voltage between each copper busbar and the battery pack case is detected in sequence, specifically including: contacting the negative pole of the multimeter with the case, and contacting the positive pole of the multimeter with the copper busbars of the battery pack in sequence, and detecting the voltage between each copper busbar and the battery pack case.

[0056] That is, a multimeter is used to measure the voltage between the copper busbar and the battery pack case. The negative pole of the multimeter is contacted with the case, and the positive pole of the multimeter is contacted with the copper busbar in turn, so as to detect the voltage value between each copper busbar and the battery pack case, and then judge whether the copper busbar is faulty based on the voltage value.

[0057] S3: Based on the voltage detection results of each copper busbar, determine whether the copper busbar is faulty and identify the faulty copper busbar.

[0058] Further, in one embodiment, based on the voltage detection results of each copper busbar, determining whether the copper busbar is faulty and determining the faulty copper busbar specifically includes:

[0059] The voltages between the copper bars and the battery pack box are obtained in sequence, and the current voltage between the copper bar and the battery pack box is judged:

[0060] If the current voltage between the copper busbar and the battery pack box is a multiple of the standard voltage of a single battery pack module, then check for other battery pack faults;

[0061] If the voltage between the current copper busbar and the battery pack body is 0, it is determined that the current copper busbar is faulty and the insulation fails.

[0062] Specifically, a multimeter is used to detect the voltage between a single copper busbar and the battery pack case. Assuming that the voltage of a single battery pack module is 50 volts, the negative pole of the multimeter is contacted with the battery pack case, and the positive pole of the multimeter is contacted with the copper busbars of the battery pack in turn. If the measured voltage between the current copper busbar and the battery pack case is 50*n volts, it indicates that the insulation of the current copper busbar has not failed, and other faults of the battery pack need to be checked; if the measured voltage between the current copper busbar and the battery pack case is 0 volts, it indicates that the current copper busbar is a faulty copper busbar with insulation failure, and it may be in contact with metal parts or the case, resulting in zero potential.

[0063] Furthermore, after determining that the current copper busbar is faulty and the insulation has failed, it also includes: replacing all faulty copper busbars, and then retesting the insulation resistance test value of the battery pack against the battery pack box, as well as testing the voltage between each copper busbar and the battery pack box.

[0064] The method for determining insulation fault of copper busbars connected to battery pack modules in the embodiment of the present application performs insulation resistance detection on the battery pack based on the insulation resistance test value of the total battery pack facing the battery pack case, thereby realizing the test of whether the insulation of the battery pack is qualified, and then sequentially detects the voltage between each copper busbar and the battery pack case according to the test result and when the qualified test fails, and then determines whether the copper busbar is faulty and determines the faulty copper busbar based on the voltage test result of each copper busbar, thereby accurately locating the faulty copper busbar, reducing blind disassembly and troubleshooting, improving troubleshooting efficiency, and having safety guidance and operability. After the faulty copper busbar is detected, it is immediately replaced to solve the fault, and the risk of module damage during the insulation detection of each module is also reduced, thereby ensuring product quality.

[0065] In a second aspect, an embodiment of the present application also provides a device for determining insulation fault of a copper busbar connected to a battery pack module.

[0066] In one embodiment, referring to Figure 2 , Figure 2 This is a functional module diagram of the battery pack module connected to the copper busbar insulation fault determination device of this application. Figure 2 As shown, the battery pack module connection copper busbar insulation fault determination device includes: a first test module, a second test module, and a determination module.

[0067] The first test module is used to detect the insulation resistance of the battery pack based on the insulation resistance test value of the battery pack facing the battery pack box, so as to detect whether the insulation of the battery pack is qualified; the second test module is used to detect the voltage between each copper busbar and the battery pack box in turn according to the test result and when the qualified test fails; the judgment module is used to judge whether the copper busbar is faulty based on the voltage test result of each copper busbar, and identify the faulty copper busbar.

[0068] In this application, the insulation resistance test of the battery pack is performed based on the insulation resistance test value of the battery pack against the battery pack box to detect whether the insulation of the battery pack is qualified, specifically including:

[0069] Based on the battery pack design requirements, test parameter settings are performed when the battery pack insulation resistance is detected, wherein the test parameters include test voltage, test time, and insulation resistance qualified value range;

[0070] Connect the positive pole of the test line of the resistance detection equipment to the positive pole of the battery pack, and the negative pole of the test line to the battery pack box. Perform the insulation resistance test of the battery pack according to the set test parameters to obtain the insulation resistance test value.

[0071] Based on the insulation resistance test value obtained by detection, it is possible to determine whether the insulation of the battery pack has passed the test.

[0072] In a third aspect, an embodiment of the present application provides a device for determining the insulation fault of a copper busbar connected to a battery pack module. The device for determining the insulation fault of a copper busbar connected to a battery pack module may be a personal computer (PC), a laptop computer, a server, or other device with data processing capabilities.

[0073] Reference Figure 3 , Figure 3 The hardware structure diagram of the battery pack module connected copper busbar insulation fault determination device involved in the embodiment of the present application is shown in FIG. In the embodiment of the present application, the battery pack module connected copper busbar insulation fault determination device may include a processor, a memory, a communication interface and a communication bus.

[0074] The communication bus may be of any type and is used to interconnect the processor, the memory, and the communication interface.

[0075] The communication interface includes an input / output (I / O) interface, a physical interface, and a logical interface, etc., which are used to realize the interconnection of the devices inside the battery pack module connection copper busbar insulation fault judgment device, and the interface used to realize the interconnection of the battery pack module connection copper busbar insulation fault judgment device with other devices (such as other computing devices or user devices). The physical interface can be an Ethernet interface, an optical fiber interface, an ATM interface, etc.; the user device can be a display (Display), a keyboard (Keyboard), etc.

[0076] The memory can be various types of storage media, such as random access memory (RAM), read-only memory (ROM), non-volatile RAM (NVRAM), flash memory, optical storage, hard disk, programmable ROM (PROM), erasable PROM (EPROM), electrically erasable PROM (EEPROM), etc.

[0077] The processor may be a general-purpose processor, which may call the battery pack module connection copper bar insulation fault determination program stored in the memory, and execute the battery pack module connection copper bar insulation fault determination method provided in the embodiment of the present application. For example, the general-purpose processor may be a central processing unit (CPU). Among them, the method executed when the battery pack module connection copper bar insulation fault determination program is called may refer to the various embodiments of the battery pack module connection copper bar insulation fault determination method of the present application, which will not be repeated here.

[0078] Those skilled in the art will understand that Figure 3 The hardware structure shown in the figure does not constitute a limitation on the present application, and may include more or less components than shown in the figure, or combine certain components, or arrange the components differently.

[0079] In a fourth aspect, an embodiment of the present application also provides a computer-readable storage medium.

[0080] The computer-readable storage medium of the present application stores a battery pack module connection copper busbar insulation fault determination program, wherein when the battery pack module connection copper busbar insulation fault determination program is executed by a processor, the steps of the battery pack module connection copper busbar insulation fault determination method as described above are implemented.

[0081] Among them, the method implemented when the battery pack module connection copper busbar insulation fault judgment program is executed can refer to the various embodiments of the battery pack module connection copper busbar insulation fault judgment method of the present application, and will not be repeated here.

[0082] It should be noted that the serial numbers of the above-mentioned embodiments of the present application are only for description and do not represent the advantages or disadvantages of the embodiments.

[0083] The terms "including" and "having" and any variations thereof in the specification and claims of the present application and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices. The terms "first", "second" and "third" are used to distinguish different objects, etc., and do not represent a sequence, nor do they limit "first", "second" and "third" to different types.

[0084] In the description of the embodiments of the present application, "exemplary", "for example" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary", "for example" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary", "for example" or "for example" is intended to present related concepts in a specific way.

[0085] In the description of the embodiments of the present application, unless otherwise specified, “ / ” means or, for example, A / B can mean A or B; the “and / or” in the text is merely a description of the association relationship of associated objects, indicating that three relationships may exist, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, “multiple” refers to two or more than two.

[0086] In some processes described in the embodiments of the present application, multiple operations or steps that appear in a specific order are included, but it should be understood that these operations or steps may not be executed in the order in which they appear in the embodiments of the present application or in parallel, and the sequence number of the operation is only used to distinguish the different operations, and the sequence number itself does not represent any execution order. In addition, these processes may include more or fewer operations, and these operations or steps may be executed in sequence or in parallel, and these operations or steps may be combined.

[0087] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, disk, CD) as described above, and includes a number of instructions for a terminal device to execute the methods described in each embodiment of the present application.

[0088] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A method for determining insulation fault of a copper busbar connecting a battery pack module, characterized in that: The method for determining insulation fault of the copper busbar connected to the battery pack module comprises: Based on the insulation resistance test value of the battery pack against the battery pack box, the battery pack insulation resistance test is performed to detect whether the battery pack insulation is qualified; According to the test results and when the qualified test fails, the voltage between each copper bar and the battery pack box is tested in turn; Based on the voltage detection results of each copper busbar, it is determined whether the copper busbar is faulty, and the faulty copper busbar is identified.

2. A method for determining insulation fault of a copper busbar connecting a battery pack module according to claim 1, characterized in that: The battery pack insulation resistance test also includes: Based on the battery pack design requirements, test parameters are set when testing the insulation resistance of the battery pack, and the test parameters include test voltage, test time, and insulation resistance qualified value range.

3. A method for determining insulation fault of a copper busbar connecting a battery pack module according to claim 2, characterized in that: The method of testing the insulation resistance of the battery pack based on the insulation resistance test value of the battery pack against the battery pack box to detect whether the insulation of the battery pack is qualified specifically includes: Connect the positive pole of the test line of the resistance detection equipment to the positive pole of the battery pack, and the negative pole of the test line to the battery pack box. Perform the insulation resistance test of the battery pack according to the set test parameters to obtain the insulation resistance test value. Based on the insulation resistance test value obtained by detection, it is possible to determine whether the insulation of the battery pack has passed the test.

4. A method for determining insulation failure of a copper busbar connecting a battery pack module as claimed in claim 3, characterized in that: The method of determining whether the insulation of the battery pack is qualified based on the insulation resistance test value obtained by the detection specifically includes: If the insulation resistance test value obtained by the test is within the qualified insulation resistance value range and greater than the standard value, the battery pack insulation test is qualified; If the insulation resistance test value obtained is not greater than the standard value, the battery pack insulation test fails, indicating that the battery pack insulation is faulty.

5. A method for determining insulation fault of a copper busbar connecting a battery pack module according to claim 1, characterized in that: The sequentially detecting and obtaining the voltage between each copper busbar and the battery pack box specifically includes: Touch the negative pole of the multimeter to the box, and the positive pole of the multimeter to the copper bars of the battery pack in turn, and detect the voltage between each copper bar and the battery pack box.

6. A method for determining insulation fault of a copper busbar connecting a battery pack module as claimed in claim 5, characterized in that: The method of judging whether the copper busbar is faulty based on the voltage detection results of each copper busbar and determining the faulty copper busbar specifically includes: The voltages between the copper bars and the battery pack box are obtained in sequence, and the current voltage between the copper bar and the battery pack box is judged: If the current voltage between the copper busbar and the battery pack box is a multiple of the standard voltage of a single battery pack module, then check for other battery pack faults; If the voltage between the current copper busbar and the battery pack body is 0, it is determined that the current copper busbar is faulty and the insulation fails.

7. A method for determining insulation fault of a copper busbar connecting a battery pack module according to claim 6, characterized in that: After determining that the current copper busbar is faulty and the insulation is ineffective, it also includes: Replace all faulty copper bars, and then retest the insulation resistance of the battery pack against the battery pack case, as well as the voltage between each copper bar and the battery pack case.

8. A battery pack module connection copper bar insulation fault determination device, characterized in that: The battery pack module connection copper busbar insulation fault determination device comprises: The first test module is used to perform a battery pack insulation resistance test based on the insulation resistance test value of the battery pack against the battery pack box to detect whether the insulation of the battery pack is qualified; The second test module is used to detect the voltage between each copper bar and the battery pack box in sequence according to the test results and when the qualified test fails; The judgment module is used to judge whether the copper busbar is faulty based on the voltage detection results of each copper busbar, and determine the faulty copper busbar.

9. A battery pack module connection copper bar insulation fault determination device as claimed in claim 8, characterized in that: The method of testing the insulation resistance of the battery pack based on the insulation resistance test value of the battery pack against the battery pack box to detect whether the insulation of the battery pack is qualified specifically includes: Based on the battery pack design requirements, test parameter settings are performed when the battery pack insulation resistance is detected, and the test parameters include test voltage, test time, and insulation resistance qualified value range; Connect the positive pole of the test line of the resistance detection equipment to the positive pole of the battery pack, and the negative pole of the test line to the battery pack box. Perform the insulation resistance test of the battery pack according to the set test parameters to obtain the insulation resistance test value. Based on the insulation resistance test value obtained by detection, it is possible to determine whether the insulation of the battery pack has passed the test.

10. A battery pack module connection copper bar insulation fault determination device, characterized in that: The battery pack module connection copper busbar insulation fault judgment device comprises a processor, a memory, and a battery pack module connection copper busbar insulation fault judgment program stored in the memory and executable by the processor, wherein when the battery pack module connection copper busbar insulation fault judgment program is executed by the processor, the steps of the battery pack module connection copper busbar insulation fault judgment method as described in any one of claims 1 to 7 are implemented.

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