Battery pack detection method and device, electronic equipment and vehicle

Abstract

The invention provides a battery pack detection method and device, electronic equipment and a vehicle, and relates to the technical field of battery detection.Based on a low-voltage maintenance switch arranged outside a battery pack, the low-voltage maintenance switch is connected with the two ends of a relay in the battery pack. Measuring a first insulation resistance value of the two ends of the relay to the shell of the battery pack and a second insulation resistance value between the two ends of the relay through the low-voltage maintenance switch; and judging the insulation state of the battery pack according to the first insulation resistance value, and judging the adhesion state of the relay according to the second insulation resistance value. According to the invention, the insulation or adhesion state of the battery pack is detected by using the connection mode of the relay and the low-voltage maintenance switch, so that the detection time is shortened, the detection efficiency is improved, and potential safety hazards possibly introduced by disassembling the battery pack are avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of battery detection, and more particularly, to a method and device for detecting a battery pack, an electronic device, and a vehicle. Background Art

[0002] Currently, for the lithium-ion battery packs used in most new energy vehicles, the batteries inside the battery pack and between the batteries and other components are usually connected through a main positive relay and a main negative relay. Due to the chemical properties of the battery pack, the internal environment of the battery pack has strict requirements for insulation. At the same time, the adhesion state of the main positive relay and the main negative relay is directly related to the working performance and safety of the battery pack. Therefore, it is necessary to frequently perform maintenance and detection on the battery pack.

[0003] In the related art, when detecting the insulation state of the battery pack and the adhesion state of the relay, it is usually necessary for maintenance personnel to manually open the outer shell of the battery pack for detection. This operation not only increases the risk of the detection process for maintenance personnel, but also, since the internal structure of the battery pack is exposed to the external environment, it is more likely to cause pollution or damage to the battery pack. In addition, frequent disassembly and reassembly of the upper cover of the battery pack may also cause loosening or damage of the contact points, affecting the long-term reliability of the battery pack. Summary of the Invention

[0004] The technical problem solved by the present invention is how to improve the detection efficiency and detection safety of the battery pack.

[0005] To solve the above technical problem, the present invention provides a method and device for detecting a battery pack, an electronic device, and a vehicle.

[0006] In a first aspect, the present invention provides a method for detecting a battery pack, based on a low-voltage maintenance switch provided outside the battery pack, the low-voltage maintenance switch being connected to both ends of a relay inside the battery pack. The method for detecting the battery pack includes:

[0007] When the relay is in an open state, measure a first insulation resistance value of both ends of the relay with respect to the housing of the battery pack and a second insulation resistance value between both ends of the relay through the low-voltage maintenance switch;

[0008] Judge the insulation state of the battery pack according to the first insulation resistance value, and judge the adhesion state of the relay according to the second insulation resistance value.

[0009] Optionally, the relay includes a main positive relay and a main negative relay, and both ends of the main positive relay and both ends of the main negative relay are connected to the low-voltage maintenance switch;

[0010] When the relay is in the off state, measuring a first insulation resistance value of both ends of the relay with respect to the housing of the battery pack and a second insulation resistance value between both ends of the relay through the low-voltage maintenance switch includes:

[0011] When the main positive relay is in the off state, measuring a first insulation resistance value of both ends of the main positive relay with respect to the housing of the battery pack through the low-voltage maintenance switch;

[0012] When the main negative relay is in the off state, measuring a first insulation resistance value of both ends of the main negative relay with respect to the housing of the battery pack through the low-voltage maintenance switch.

[0013] Optionally, when the relay is in the off state, measuring a first insulation resistance value of both ends of the relay with respect to the housing of the battery pack and a second insulation resistance value between both ends of the relay through the low-voltage maintenance switch further includes:

[0014] When the main positive relay is in the off state, measuring the second insulation resistance value between both ends of the main positive relay through the low-voltage maintenance switch;

[0015] When the main negative relay is in the off state, measuring the second insulation resistance value between both ends of the main negative relay through the low-voltage maintenance switch.

[0016] Optionally, judging the insulation state of the battery pack according to the first insulation resistance value includes:

[0017] Judging the magnitude relationship between the first insulation resistance value and a first preset resistance threshold;

[0018] When the first insulation resistance value is greater than or equal to the first preset resistance threshold, determining that the insulation state of the battery pack is normal;

[0019] When the first insulation resistance value is less than the first preset resistance threshold, determining that the insulation state of the battery pack is abnormal.

[0020] Optionally, the battery pack detection method further includes:

[0021] When the insulation state of the battery pack is abnormal, determining one end of the relay corresponding to the first insulation resistance value less than the first preset resistance threshold as the insulation abnormal position.

[0022] Optionally, judging the adhesion state of the relay according to the second insulation resistance value includes:

[0023] Determine the magnitude relationship between the second insulation resistance value and the second preset resistance threshold;

[0024] When the second insulation resistance value is greater than or equal to the second preset resistance threshold, it is determined that the relay is not stuck;

[0025] When the second insulation resistance value is less than the second preset resistance threshold, it is determined that the relay is stuck.

[0026] Optionally, the battery pack includes a housing, a battery module, a main positive relay, a main negative relay, a high-voltage output plug, a low-voltage output plug, and a battery management system. The battery module, the main positive relay, the main negative relay, and the battery management system are arranged in the housing. The high-voltage output plug and the low-voltage output plug are arranged on the surface of the housing. The positive electrode of the battery module is connected to the high-voltage output plug through the main positive relay, and the negative electrode of the battery module is connected to the low-voltage output plug through the main negative relay. The battery management system is respectively connected to the communication terminal of the battery module, the control terminal of the main positive relay, and the control terminal of the main negative relay.

[0027] In a second aspect, the present invention provides a battery pack detection device. Based on a low-voltage maintenance switch arranged outside the battery pack, the low-voltage maintenance switch is connected to both ends of a relay in the battery pack. The battery pack detection device includes:

[0028] A measurement module, configured to measure a first insulation resistance value of both ends of the relay with respect to the housing of the battery pack and a second insulation resistance value between both ends of the relay through the low-voltage maintenance switch when the relay is in an off state;

[0029] A state judgment module, configured to judge the insulation state of the battery pack according to the first insulation resistance value and judge the sticking state of the relay according to the second insulation resistance value.

[0030] In a third aspect, the present invention provides an electronic device, including a computer-readable storage medium storing a computer program and a processor. When the computer program is read and run by the processor, the battery pack detection method as described above is implemented.

[0031] In a fourth aspect, the present invention provides a vehicle, including the electronic device as described above.

[0032] The battery pack detection method, device and vehicle of the present invention can quickly measure the insulation resistance between both ends of the relay and the housing of the battery pack through a low-voltage maintenance switch arranged outside the battery pack, and detect the insulation resistance between both ends of the relay, so as to respectively judge the insulation state of the battery pack and the adhesion state of the relay. Since the low-voltage maintenance switch is arranged outside the battery pack, without disassembling the battery pack, the insulation resistance value measured through the low-voltage maintenance switch can be used as a judgment basis to quickly and accurately identify insulation faults or relay adhesion problems, which not only effectively shortens the detection time and improves the detection efficiency, but also avoids potential safety hazards that may be introduced due to disassembling the battery pack, such as exposure to high-voltage electricity or contamination of the battery pack, etc., thus effectively improving the safety and convenience of detection in the detection process. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 FIG. 1 is one of the structural schematic diagrams of the battery pack according to an embodiment of the present invention;

[0034] Figure 2 FIG. 2 is a flowchart of the battery pack detection method according to an embodiment of the present invention;

[0035] Figure 3 FIG. 3 is another structural schematic diagram of the battery pack according to another embodiment of the present invention;

[0036] Figure 4 FIG. 4 is a structural schematic diagram of a battery pack detection device according to another embodiment of the present invention;

[0037] Figure 5 FIG. 5 is a structural schematic diagram of an electronic device according to still another embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0038] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the following detailed description of the specific embodiments of the present invention will be given with reference to the accompanying drawings. Although some embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. On the contrary, these embodiments are provided to more thoroughly and completely understand the present invention. It should be understood that the drawings and embodiments of the present invention are only for exemplary purposes and are not used to limit the protection scope of the present invention.

[0039] It should be understood that the various steps recorded in the method embodiments of the present invention can be executed in different orders and / or in parallel. In addition, the method embodiments may include additional steps and / or omit the steps shown. The scope of the present invention is not limited in this regard.

[0040] As used herein, the term "comprising" and its variations are open-ended, i.e., "including but not limited to"; the term "based on" means "at least partially based on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; the term "optionally" means "optional embodiment". The relevant definitions of other terms will be given in the following description. It should be noted that the concepts such as "first", "second", etc. mentioned in the present invention are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0041] It should be noted that the modifications of "one" and "plural" mentioned in the present invention are illustrative rather than restrictive. Those skilled in the art should understand that unless otherwise clearly specified in the context, it should be understood as "one or more".

[0042] The names of the messages or information exchanged between multiple devices in the embodiments of the present invention are only for illustrative purposes and are not used to limit the scope of these messages or information.

[0043] In the related art, lithium-ion batteries are widely used due to their high energy density, long cycle life and good environmental adaptability. In the automotive field, especially in the field of new energy vehicles, lithium-ion battery packs are usually used for power supply. With the development of technology, the capacity of the battery pack is getting larger and the structure is getting more and more complex, which puts forward higher requirements for the safety and maintainability of the battery pack. The batteries inside the battery pack and between the batteries and other components are usually connected through the main positive relay and the main negative relay. Due to the chemical properties of the batteries, the internal environment of the battery pack has strict requirements for insulation. At the same time, the adhesion state of the main positive and main negative relays is directly related to the working performance and safety of the battery pack. Therefore, it is crucial to monitor the insulation state inside the battery pack and the working condition of the relays. Traditional battery pack maintenance and detection often require opening the battery pack housing, which not only increases the risk of the detection process, but also may cause pollution or damage to the battery pack due to exposure to the external environment. In addition, frequent disassembly and reassembly of the battery pack upper cover may also cause loosening or damage of the contact points, affecting the long-term reliability of the battery pack. In addition, the detection process requires professional personnel, increasing the maintenance cost, and for large-scale battery systems, the detection work is complex and time-consuming.

[0044] Combined with Figure 1 and Figure 2 As shown, in view of the problems existing in the above related art, this embodiment provides a battery pack testing method, based on a low-voltage maintenance switch provided outside the battery pack, and the low-voltage maintenance switch is connected to both ends of the relay inside the battery pack.

[0045] Specifically, a low-voltage maintenance switch is arranged on the outer side of the battery pack shell, and both ends of the relay inside the battery pack are connected to the low-voltage maintenance switch.

[0046] In a preferred embodiment of the present invention, Figure 3 As shown, the battery pack includes a shell, a battery module, a main positive relay, a main negative relay, a high-voltage output connector, a low-voltage output connector and a battery management system. The battery module, the main positive relay, the main negative relay and the battery management system are arranged in the shell, the high-voltage output connector and the low-voltage output connector are arranged on the surface of the shell, the positive electrode of the battery module is connected to the high-voltage output connector through the main positive relay, and the negative electrode of the battery module is connected to the low-voltage output connector through the main negative relay. The battery management system is respectively connected to the communication end of the battery module, the control end of the main positive relay and the control end of the main negative relay.

[0047] In this embodiment, the front and rear contacts A and B of the main positive relay and the front and rear contacts C and D of the main negative relay are connected to the low-voltage maintenance switch, so that the relay adhesion and the insulation condition inside the battery pack can be tested directly at the low-voltage maintenance switch without opening the package for inspection.

[0048] Battery pack detection methods include:

[0049] When the relay is in the disconnected state, the first insulation resistance values ​​of the two ends of the relay to the housing of the battery pack and the second insulation resistance value between the two ends of the relay are measured through the low-voltage maintenance switch.

[0050] Specifically, since the insulation resistance value can directly reflect the integrity of the insulating material inside the battery pack and the conduction of the relay contacts, when the insulating material is aged, damaged or contaminated, its insulation resistance value will be significantly reduced. Therefore, based on the above battery pack structure, the resistance value between the relay inside the battery pack and the battery pack shell is determined by a low-voltage maintenance switch, and is used as the first insulation resistance. Figure 3 As shown, when it is necessary to confirm the insulation condition of the battery pack, measure the Figure 3 The insulation resistance values ​​of the two ends of the main positive relay or the main negative relay (i.e., the four points A, B, C, and D) to the battery pack shell are respectively measured to determine the insulation conditions of each position in the battery pack. For the adhesion state of the relay, under normal circumstances, the relay contacts should be in a high-resistance state when disconnected, that is, the insulation resistance value is high. In summary, the adhesion state of the relay can be judged by the resistance value between the two ends of the relay. Therefore, based on the structure of the above-mentioned battery pack, the insulation resistance value between the two ends of the relay is measured by the low-voltage maintenance switch, and it is used as the second insulation resistance value.

[0051] Judge the insulation state of the battery pack according to the first insulation resistance value, and judge the adhesion state of the relay according to the second insulation resistance value.

[0052] Specifically, as shown in Figure 3 , when it is necessary to confirm the insulation situation inside the battery pack, the insulation resistance values of the main positive relay or the main negative relay at both ends (i.e., the four points A, B, C, and D) with respect to the battery pack housing are respectively measured through the low-voltage maintenance switch, so as to respectively determine the insulation situation inside the battery pack. When it is necessary to confirm the adhesion situation of the relay, the resistance values between the two ends of the main positive relay or the main negative relay (i.e., the four points A, B, C, and D) in Figure 3 are respectively measured through the low-voltage maintenance switch, so as to respectively determine the adhesion situation of each relay. Figure 3

[0053] The battery pack detection method of the present invention quickly measures the insulation resistance between the two ends of the relay and the battery pack housing through the low-voltage maintenance switch provided outside the battery pack, and detects the insulation resistance between the two ends of the relay, so as to respectively judge the insulation state of the battery pack and the adhesion state of the relay. Since the low-voltage maintenance switch is provided outside the battery pack, the insulation resistance value measured through the low-voltage maintenance switch can be used as the judgment basis without disassembling the battery pack, quickly and accurately identifying insulation faults or relay adhesion problems, not only effectively shortening the detection time and improving the detection efficiency, but also avoiding potential safety hazards that may be introduced due to disassembling the battery pack, such as exposure to high-voltage electricity or battery pack contamination, etc., thus effectively improving the safety and convenience of detection in the detection process.

[0054] Optionally, the relay includes a main positive relay and a main negative relay, and both ends of the main positive relay and both ends of the main negative relay are connected to the low-voltage maintenance switch;

[0055] When the relay is in the off state, measure the first insulation resistance value of both ends of the relay with respect to the battery pack housing respectively through the low-voltage maintenance switch, and the second insulation resistance value between both ends of the relay, including:

[0056] When the main positive relay is in the off state, measure the first insulation resistance value of both ends of the main positive relay with respect to the battery pack housing respectively through the low-voltage maintenance switch;

[0057] When the main negative relay is in the off state, measure the first insulation resistance value of both ends of the main negative relay with respect to the battery pack housing respectively through the low-voltage maintenance switch.

[0058] Figure 3 Exemplarily, through the low-voltage maintenance switch, the insulation resistance values of both ends of the main positive relay and the main negative relay with respect to the battery pack housing can be respectively measured, and these measured values are the first insulation resistance values. As shown in Figure 3As shown, in specific implementation, point A and point B of the main positive relay respectively correspond to an insulation resistance value, and point C and point D of the main negative relay also respectively correspond to an insulation resistance value. By measuring the insulation resistance values of point A and point B with respect to the housing, the insulation states of the outside and inside of the main positive relay can be judged; similarly, by measuring the insulation resistance values of point C and point D with respect to the housing, the insulation states of the inside and outside of the main negative relay can be judged. This method allows for quickly and accurately detecting the insulation performance between both ends of the relay and the housing without disassembling the battery pack, thereby effectively evaluating the insulation condition inside the battery pack.

[0059] In this optional embodiment, the insulation resistance is measured through the low-voltage maintenance switch, without the need to open the battery pack housing, greatly reducing the risk for maintenance personnel to contact the high-voltage circuit and improving the safety of detection. Secondly, this method simplifies the detection process, reduces potential damage caused by frequent disassembly and assembly of the battery pack, and extends the service life of the battery pack. At the same time, the rapid detection ability significantly improves the maintenance efficiency and reduces the detection cost, especially suitable for the rapid detection of large-scale battery systems.

[0060] Optionally, when the relay is in the off state, the first insulation resistance value of both ends of the relay with respect to the housing of the battery pack and the second insulation resistance value between both ends of the relay are measured through the low-voltage maintenance switch, and it further includes:

[0061] When the main positive relay is in the off state, the second insulation resistance value between both ends of the main positive relay is measured through the low-voltage maintenance switch;

[0062] When the main negative relay is in the off state, the second insulation resistance value between both ends of the main negative relay is measured through the low-voltage maintenance switch.

[0063] Exemplarily, in combination with Figure 3 As shown, both ends (point A and point B) of the main positive relay and both ends (point C and point D) of the main negative relay are connected to the low-voltage maintenance switch through wires. During the measurement process, the measuring device is respectively connected to point A and point B of the main positive relay and point C and point D of the main negative relay through the low-voltage maintenance switch, thereby measuring the resistance values between point A and point B and between point C and point D. These measured values are the second insulation resistance values, used to judge whether there is an adhesion phenomenon in the relay.

[0064] In this optional embodiment, by measuring the second insulation resistance value between both ends of the relay through the low-voltage maintenance switch, the adhesion state of the relay can be quickly detected without opening the battery pack housing, greatly improving the detection efficiency and safety. This method avoids potential risks and costs caused by frequent disassembly and assembly of the battery pack housing, and at the same time reduces the possibility for maintenance personnel to contact the high-voltage circuit, significantly reducing the safety risk.

[0065] Optionally, judging the insulation state of the battery pack according to the first insulation resistance value includes:

[0066] Judging the magnitude relationship between the first insulation resistance value and the first preset resistance threshold;

[0067] When the first insulation resistance value is greater than or equal to the first preset resistance threshold, it is determined that the insulation state of the battery pack is normal;

[0068] When the first insulation resistance value is less than the first preset resistance threshold, it is determined that the insulation state of the battery pack is abnormal.

[0069] Exemplarily, the insulation state of the battery pack is judged by comparing the measured first insulation resistance value with the preset resistance threshold. Based on the above embodiments, the first insulation resistance value refers to the insulation resistance value between both ends of the main positive relay and the main negative relay and the battery pack housing. Combining Figure 3 As shown, point A and point B of the main positive relay, and point C and point D of the main negative relay are respectively connected to the measuring device through the low-voltage maintenance switch for measuring the insulation resistance value between them and the housing. In a preferred embodiment of the present invention, the first preset resistance threshold is set to 10 megaohms. Therefore, when the first insulation resistance value corresponding to each end of each relay is greater than or equal to 10 megaohms, it is determined that the insulation state of the battery pack is normal; while when there is at least one end of a relay whose corresponding first insulation resistance value is lower than 10 megaohms, it is determined that the insulation state is abnormal. A high insulation resistance value indicates good integrity of the insulating material, and current will not leak through an unexpected path, thus indicating normal insulation inside the battery pack; while a low insulation resistance value implies that the insulating material may be damaged or there is a risk of electric leakage. In this way, the insulation state of the battery pack can be judged quickly and accurately, providing a basis for subsequent maintenance and safety assessment.

[0070] In this optional embodiment, firstly, by setting a clear first preset resistance threshold, a quick and quantitative judgment of the insulation state is realized, avoiding errors caused by subjective judgment. Secondly, it is also possible to complete the detection without disassembling the battery pack, greatly reducing the detection cost and time, and at the same time reducing the risk of battery pack damage caused by frequent disassembly and assembly.

[0071] Optionally, the battery pack detection method further includes:

[0072] When the insulation state of the battery pack is abnormal, determine that one end of the relay corresponding to the first insulation resistance value less than the first preset resistance threshold is the insulation abnormal position.

[0073] Exemplarily, when it is detected that the insulation state of the battery pack is abnormal, the specific position of the insulation abnormality is determined through the measurement position of the low-voltage maintenance switch. Combining Figure 3As shown, in a preferred embodiment of the present invention, both ends (points A, B, C, and D) of the main positive relay and the main negative relay are respectively connected to the measuring device through a low-voltage maintenance switch. During the measurement process, if the insulation resistance value between point A or B of the main positive relay and the housing is less than 10 megohms, it can be determined that there is an abnormality in the insulation outside (point A) or inside (point B) of the main positive relay; similarly, if the insulation resistance value between point C or D of the main negative relay and the housing is less than 10 megohms, it can be determined that there is a problem with the insulation inside (point C) or outside (point D) of the main negative relay. In this way, not only can it be determined whether the insulation state is abnormal, but also the specific location of the abnormality can be further located, providing more accurate guidance for maintenance personnel.

[0074] In this alternative embodiment, the abnormal position is directly determined by the measurement position of the low-voltage maintenance switch, without disassembling the battery pack, greatly improving the maintenance efficiency and reducing the maintenance cost. At the same time, accurately positioning the abnormal position can help maintenance personnel quickly take targeted measures, reduce the troubleshooting time, and improve the maintenance efficiency and reliability of the battery pack, especially suitable for scenarios such as new energy vehicles that require quick repair and ensure safe operation.

[0075] Optionally, judging the adhesion state of the relay according to the second insulation resistance value includes:

[0076] Judging the magnitude relationship between the second insulation resistance value and the second preset resistance threshold;

[0077] When the second insulation resistance value is greater than or equal to the second preset resistance threshold, it is determined that the relay does not have adhesion;

[0078] When the second insulation resistance value is less than the second preset resistance threshold, it is determined that the relay has adhesion.

[0079] Exemplarily, when the relay contacts are normally separated, a high-resistance state (greater than or equal to 1 megohm) should be presented between its two ends, and when the contacts are adhered, the resistance value will be significantly reduced. Based on this principle, the adhesion state of the relay can be quickly judged without disassembling the battery pack, providing an important basis for the safety and reliability evaluation of the battery pack. In a preferred embodiment of the present invention, the second preset resistance threshold is set to 1 megohm. The measuring device is connected through the low-voltage maintenance switch, and the resistance values between point A and point B of the main positive relay, and between point C and point D of the main negative relay are respectively measured, that is, the second insulation resistance value. If the measured second insulation resistance value is greater than or equal to 1 megohm, it is determined that the relay does not have adhesion; if the resistance value is less than 1 megohm, it is determined that the relay has adhesion.

[0080] In this alternative embodiment, by setting a clear resistance threshold, a rapid and quantitative determination of the adhesion state of the relay is achieved, avoiding errors caused by subjective judgment. Secondly, since there is no need to open the battery pack housing, the detection cost and time are greatly reduced, and at the same time, the risk of battery pack damage caused by frequent disassembly and assembly is reduced.

[0081] Optionally, the battery pack includes a housing, a battery module, a main positive relay, a main negative relay, a high-voltage output connector, a low-voltage output connector, and a battery management system. The battery module, the main positive relay, the main negative relay, and the battery management system are arranged inside the housing. The high-voltage output connector and the low-voltage output connector are arranged on the surface of the housing. The positive electrode of the battery module is connected to the high-voltage output connector through the main positive relay, and the negative electrode of the battery module is connected to the low-voltage output connector through the main negative relay. The battery management system is respectively connected to the communication terminal of the battery module, the control terminal of the main positive relay, and the control terminal of the main negative relay.

[0082] Exemplarily, the battery pack includes a housing, a battery module, a main positive relay, a main negative relay, a high-voltage output connector, a low-voltage output connector, and a battery management system. Among them, the positive and negative electrodes of the battery module are respectively connected to the high-voltage and low-voltage output connectors through the main positive relay and the main negative relay, and the battery management system is connected to the communication terminal of the battery module, the control terminals of the main positive relay and the main negative relay. This structural design enables the battery pack to realize real-time monitoring and management of the battery module through the battery management system during operation, and at the same time realizes the on-off of the circuit through the control of the relay to ensure the safe operation of the battery pack. As shown in Figure 3 shown, the detection device connected through the low-voltage maintenance switch can quickly measure the insulation resistance value (the first insulation resistance value) of points A and B of the main positive relay to the housing, and the resistance value between points A and B (the second insulation resistance value). Similarly, points C and D of the main negative relay will also be measured. This measurement method utilizes the convenience and external connectivity of the low-voltage maintenance switch, enabling the detection device to directly obtain key resistance value data without directly contacting the high-voltage components inside the battery pack. In this way, not only can the detection be completed quickly, but also the safety and reliability of the detection process can be ensured.

[0083] In this alternative embodiment, the test points of the relay are led out to the outside through the low-voltage maintenance switch, so that the detection process does not require disassembling the battery pack, greatly reducing the detection cost and time, and at the same time reducing the potential risks caused by frequent disassembly and assembly.

[0084] As shown in Figure 4 shown, an embodiment of the present invention provides a battery pack detection device 400. Based on the low-voltage maintenance switch arranged outside the battery pack, the low-voltage maintenance switch is connected to both ends of the relay inside the battery pack. The battery pack detection device includes:

[0085] A measurement module 410, configured to measure a first insulation resistance value of both ends of a relay with respect to a housing of a battery pack and a second insulation resistance value between both ends of the relay through a low-voltage maintenance switch when the relay is in an open state;

[0086] A state determination module 420, configured to determine an insulation state of the battery pack according to the first insulation resistance value and determine an adhesion state of the relay according to the second insulation resistance value.

[0087] The battery pack detection device of the present invention has the same advantages over the prior art as those of the above-mentioned battery pack detection method over the prior art, and will not be elaborated herein.

[0088] Combined Figure 5 As shown, another embodiment of the present invention provides an electronic device, including a computer-readable storage medium storing a computer program and a processor. When the computer program is read and run by the processor, the above-mentioned battery pack detection method is implemented.

[0089] Or, an electronic device 500 includes a memory 510 and a processor 520 connected to the memory 510; the memory 510 is configured to store a computer program; the processor 520 is configured to perform the following operations when executing the computer program:

[0090] When the relay is in an open state, measure a first insulation resistance value of both ends of the relay with respect to the housing of the battery pack and a second insulation resistance value between both ends of the relay through a low-voltage maintenance switch;

[0091] Determine the insulation state of the battery pack according to the first insulation resistance value and determine the adhesion state of the relay according to the second insulation resistance value.

[0092] The electronic device of the present invention has the same advantages over the prior art as those of the above-mentioned battery pack detection method over the prior art, and will not be elaborated herein.

[0093] Another embodiment of the present invention provides a vehicle, including the above-mentioned electronic device.

[0094] The vehicle of the present invention has the same advantages over the prior art as those of the above-mentioned battery pack detection method over the prior art, and will not be elaborated herein.

[0095] A computer-readable storage medium provided by another embodiment of the present invention stores a computer program, and when the computer program is executed by a processor, the above-mentioned battery pack detection method is implemented.

[0096] That is to say, a non-volatile computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the processor performs the following operations:

[0097] When the relay is in the off state, measure the first insulation resistance value of both ends of the relay with respect to the housing of the battery pack and the second insulation resistance value between both ends of the relay through a low-voltage maintenance switch;

[0098] Judge the insulation state of the battery pack according to the first insulation resistance value, and judge the adhesion state of the relay according to the second insulation resistance value.

[0099] Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be completed by instructing relevant hardware through a computer program. The program can be stored in a computer-readable storage medium. When the program is executed, it can include the processes of the embodiments of the above methods. Among them, the storage medium can be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM), etc. In this application, the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they can be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiments of the present invention. In addition, the functional units in each embodiment of the present invention can be integrated into one processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit. The above integrated units can be implemented in the form of hardware or in the form of software functional units.

[0100] Although the present invention is disclosed as above, the protection scope of the present invention is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications will all fall within the protection scope of the present invention.

Claims

1. A battery pack detection method, characterized in that, Based on a low-voltage maintenance switch disposed outside the battery pack, the low-voltage maintenance switch is connected to both ends of a relay inside the battery pack, and the battery pack detection method includes: When the relay is in an open state, measure a first insulation resistance value of both ends of the relay with respect to the housing of the battery pack respectively through the low-voltage maintenance switch, and a second insulation resistance value between both ends of the relay. Judge the insulation state of the battery pack according to the first insulation resistance value, and judge the adhesion state of the relay according to the second insulation resistance value.

2. The battery pack detection method according to claim 1, wherein The relay includes a main positive relay and a main negative relay, and both ends of the main positive relay and both ends of the main negative relay are connected to the low-voltage maintenance switch. The step of when the relay is in an open state, measure a first insulation resistance value of both ends of the relay with respect to the housing of the battery pack respectively through the low-voltage maintenance switch, and a second insulation resistance value between both ends of the relay includes: When the main positive relay is in an open state, measure a first insulation resistance value of both ends of the main positive relay with respect to the housing of the battery pack respectively through the low-voltage maintenance switch. When the main negative relay is in an open state, measure a first insulation resistance value of both ends of the main negative relay with respect to the housing of the battery pack respectively through the low-voltage maintenance switch.

3. The battery pack detection method according to claim 2, wherein The step of when the relay is in an open state, measure a first insulation resistance value of both ends of the relay with respect to the housing of the battery pack respectively through the low-voltage maintenance switch, and a second insulation resistance value between both ends of the relay further includes: When the main positive relay is in an open state, measure the second insulation resistance value between both ends of the main positive relay respectively through the low-voltage maintenance switch. When the main negative relay is in an open state, measure the second insulation resistance value between both ends of the main negative relay through the low-voltage maintenance switch.

4. The battery pack detection method according to claim 1, characterized in that, The step of judging the insulation state of the battery pack according to the first insulation resistance value includes: Judge the magnitude relationship between the first insulation resistance value and a first preset resistance threshold. When the first insulation resistance value is greater than or equal to the first preset resistance threshold, determine that the insulation state of the battery pack is normal. When the first insulation resistance value is less than the first preset resistance threshold, determine that the insulation state of the battery pack is abnormal.

5. The battery pack detection method according to claim 4, wherein The battery pack detection method further includes: When the insulation state of the battery pack is abnormal, determine that one end of the relay corresponding to the first insulation resistance value less than the first preset resistance threshold is the insulation abnormal position.

6. The battery pack detection method according to claim 1, wherein The step of judging the adhesion state of the relay according to the second insulation resistance value includes: Judge the magnitude relationship between the second insulation resistance value and a second preset resistance threshold. When the second insulation resistance value is greater than or equal to the second preset resistance threshold, determine that the relay has no adhesion. When the second insulation resistance value is less than the second preset resistance threshold, determine that the relay has adhesion.

7. The battery pack detection method according to any one of claims 1 to 6, characterized in that The battery pack includes a housing, a battery module, a main positive relay, a main negative relay, a high-voltage output connector, a low-voltage output connector, and a battery management system. The battery module, the main positive relay, the main negative relay, and the battery management system are disposed within the housing. The high-voltage output connector and the low-voltage output connector are disposed on the surface of the housing. The positive electrode of the battery module is connected to the high-voltage output connector through the main positive relay. The negative electrode of the battery module is connected to the low-voltage output connector through the main negative relay. The battery management system is respectively connected to the communication terminal of the battery module, the control terminal of the main positive relay, and the control terminal of the main negative relay.

8. A battery pack detection device, characterized in that, Based on a low-voltage maintenance switch disposed outside the battery pack, the low-voltage maintenance switch is connected to both ends of the relay within the battery pack. The battery pack detection device includes: A measurement module, configured to measure a first insulation resistance value of both ends of the relay with respect to the housing of the battery pack and a second insulation resistance value between both ends of the relay when the relay is in an open state through the low-voltage maintenance switch. A state determination module, configured to determine the insulation state of the battery pack according to the first insulation resistance value and determine the adhesion state of the relay according to the second insulation resistance value.

9. An electronic device, characterized in that, It includes a computer-readable storage medium storing a computer program and a processor. When the computer program is read and run by the processor, it implements the battery pack detection method according to any one of claims 1 to 7.

10. A vehicle, characterized in that, It includes the electronic device according to claim 9.

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