Method and device for detecting insulation state of battery

Abstract

The embodiment of the invention provides a method and device for detecting the insulation state of a battery. Whether the battery is in an insulation state or not can be quickly determined. The method comprises the following steps: acquiring a first voltage, wherein the first voltage is a voltage between a first output electrode of a to-be-detected battery module and a shell of the to-be-detected battery module; acquiring a second voltage, wherein the second voltage is a voltage between a second output electrode of the to-be-detected battery module and a shell of the to-be-detected battery module; and determining the insulation state of the battery module to be detected according to the first voltage and the second voltage.

Description

Technical Field

[0001] Embodiments of the present application relate to the field of batteries, and more specifically, to a method and device for detecting the insulation status of a battery. Background Art

[0002] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. In this case, electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages of energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in their development.

[0003] With the development of battery technology, various performances of batteries are constantly improving. During the use of batteries, the battery cells in the battery are required to have good insulation properties. Therefore, how to quickly detect the insulation state of the battery is still a problem that needs to be solved. Summary of the invention

[0004] The embodiments of the present application provide a method and device for detecting the insulation state of a battery, which can quickly determine whether the battery is in an insulation state.

[0005] In a first aspect, a method for detecting the insulation state of a battery is provided, comprising: obtaining a first voltage, wherein the first voltage is the voltage between a first output pole of a battery module to be detected and a shell of the battery module to be detected; obtaining a second voltage, wherein the second voltage is the voltage between a second output pole of the battery module to be detected and the shell of the battery module to be detected; and determining the insulation state of the battery module to be detected based on the first voltage and the second voltage.

[0006] By determining the insulation state of the battery module to be detected by the values ​​of the first voltage and the second voltage, it is possible to easily determine whether the battery or battery module is in a good insulation state or in a failed insulation state, which is beneficial to improving the efficiency of insulation fault troubleshooting. At the same time, this method can reduce the contact between the troubleshooting personnel and the battery module to be detected, and reduce the possibility of electric shock to the on-site troubleshooting personnel.

[0007] In some embodiments, determining the insulation state of the battery module to be detected based on the first voltage and the second voltage includes: when the first voltage is 0 and the second voltage is 0, determining that the battery module to be detected is in an insulation state.

[0008] By combining the first voltage and the second voltage to determine the insulation state of the battery module to be detected, a battery module with good insulation can be easily and quickly checked out, which is beneficial to improving the efficiency of insulation fault troubleshooting.

[0009] In some embodiments, determining the insulation state of the battery module to be detected based on the first voltage and the second voltage includes: when the first voltage is greater than a first threshold and / or the second voltage is greater than a first threshold, determining that the battery module to be detected is in a state of insulation failure.

[0010] In an embodiment of the present application, if at least one of the first voltage and the second voltage is greater than the first threshold, it can be determined that the battery module to be detected is in a state of insulation failure. This detection method can quickly and efficiently determine the battery module in a state of insulation failure, thereby improving the efficiency of insulation fault troubleshooting.

[0011] In some embodiments, the battery module to be inspected includes multiple battery cells, and the method further includes: obtaining the number of the battery cells; determining the insulation state of the battery module to be inspected based on the first voltage and the second voltage includes: determining a first battery cell based on the first voltage, the second voltage and the number of battery cells, the first battery cell being a battery cell with insulation failure among the multiple battery cells.

[0012] The position of the first battery cell where insulation failure occurs can be determined by the first voltage, the second voltage and the number of battery cells, which is helpful for quickly locating the insulation failure point and improving the efficiency of troubleshooting insulation faults.

[0013] In some embodiments, determining the first battery cell based on the first voltage, the second voltage and the number of battery cells includes: determining the number of battery cells between the first battery cell and the first output pole based on a proportional relationship between the first voltage and the second voltage; and / or determining the number of battery cells between the first battery cell and the second output pole based on a proportional relationship between the first voltage and the second voltage.

[0014] The battery cell with insulation failure in the battery module to be detected is determined by the proportional relationship between the first voltage and the second voltage. The measurement data is relatively small and the calculation method is simple. The battery cell with insulation failure can be determined without frequently changing the measurement point, which is conducive to quickly determining the insulation failure point, thereby improving the efficiency of troubleshooting insulation failure faults.

[0015] In some embodiments, a third voltage is obtained, where the third voltage is the voltage between the first output pole and the second output pole; and determining the first battery cell based on the first voltage, the second voltage and the number of battery cells includes: determining the first battery cell based on the first voltage, the second voltage, the third voltage and the number of battery cells.

[0016] By further measuring the value of the third voltage, the insulation failure of the battery module to be tested can be preliminarily determined, which is conducive to improving the efficiency of insulation fault troubleshooting. At the same time, corresponding protective measures can also be taken during subsequent testing or maintenance to reduce the possibility of electric shock to on-site investigators.

[0017] In some embodiments, the determining of the first battery cell according to the first voltage, the second voltage, the third voltage and the number of battery cells includes: when the sum of the first voltage and the second voltage is equal to the third voltage, determining the number of battery cells that are away from the first battery cell to the first output pole according to the first voltage, the third voltage and the number of battery cells, and / or determining the number of battery cells that are away from the first battery cell to the second output pole according to the second voltage, the third voltage and the number of battery cells.

[0018] When the sum of the first voltage and the second voltage is equal to the third voltage, the third voltage can be used as a calculation parameter to determine the position of the first battery cell in the battery module to be detected. On the one hand, the third voltage is a roughly constant fixed value, the measurement result is more accurate, and the accuracy of the calculation result can be improved; on the other hand, the introduction of the third voltage can simplify the calculation process, quickly determine the insulation failure point in the battery module to be detected, and improve the efficiency of insulation fault detection.

[0019] In some embodiments, the battery module to be tested includes multiple battery cells, and the method also includes: obtaining a third voltage, the third voltage being the voltage between the first output pole and the second output pole; determining the insulation state of the battery module to be tested based on the first voltage and the second voltage, including: determining a first battery cell based on the first voltage, the second voltage and the third voltage, the first battery cell being a battery cell with insulation failure among the multiple battery cells.

[0020] This can quickly locate the insulation failure point in the battery module to be tested, further reduce the amount of calculation, and help improve the efficiency of troubleshooting insulation failure faults.

[0021] In some embodiments, the determining of the first battery cell based on the first voltage, the second voltage and the third voltage includes: when the second voltage is less than a first threshold value and the first voltage is equal to the third voltage, the first battery cell is a battery cell connected to the second output pole; or, when the first voltage is less than a first threshold value and the second voltage is equal to the third voltage, the first battery cell is a battery cell connected to the first output pole.

[0022] In the embodiment of the present application, the position of the insulation failure point can be determined only by the measurement results of the first voltage, the second voltage and the third voltage, which can achieve rapid positioning of the insulation failure point and help improve the efficiency of troubleshooting insulation faults.

[0023] In some embodiments, the method further includes: obtaining a first resistance between a first output pole and the shell of the battery module to be detected, and verifying the insulation state of the battery module to be detected based on the first resistance; and / or obtaining a second resistance between a second output pole and the shell of the battery module to be detected, and verifying the insulation state of the battery module to be detected based on the second resistance.

[0024] By obtaining the resistance values ​​of the first resistor and the second resistor, it can be further verified whether the battery cell to be tested is in a good insulation state or in an insulation failure state, which can reduce the impact of measurement errors on the test results and help improve the accuracy of the test results.

[0025] In a second aspect, a device for detecting the insulation state of a battery is provided, comprising: a processing module, wherein the processing module is used to execute the method as described in any embodiment of the first aspect.

[0026] In a third aspect, a device for detecting the insulation status of a battery is provided, comprising: a processor and a memory, wherein the memory stores instructions, and when the instructions are executed by the processor, the device executes the method described in any embodiment of the first aspect.

[0027] In a fourth aspect, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed, the method described in any one of the embodiments of the first aspect is executed. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without paying creative work.

[0029] Figure 1 It is a structural schematic diagram of a vehicle provided in an embodiment of the present application.

[0030] Figure 2 It is a schematic diagram of the structure of a battery provided in an embodiment of the present application.

[0031] Figure 3 It is a schematic block diagram of a method for detecting the insulation status of a battery provided in an embodiment of the present application.

[0032] Figure 4 This is a schematic diagram of a measurement circuit for a first voltage and a second voltage provided in an embodiment of the present application.

[0033] Figure 5 It is a schematic block diagram of another method for detecting the insulation status of a battery provided in an embodiment of the present application.

[0034] Figure 6 This is another schematic diagram of a measurement circuit for a first voltage and a second voltage provided in an embodiment of the present application.

[0035] Figure 7 It is a schematic block diagram of another method for detecting the insulation status of a battery provided in an embodiment of the present application.

[0036] Figure 8 This is a schematic diagram of a third voltage measurement circuit provided in an embodiment of the present application.

[0037] Fig. 9 It is a schematic block diagram of another method for detecting the insulation status of a battery provided in an embodiment of the present application.

[0038] Fig.10 It is a schematic block diagram of another method for detecting the insulation status of a battery provided in an embodiment of the present application.

[0039] Fig.11 It is a schematic block diagram of another method for detecting the insulation status of a battery provided in an embodiment of the present application.

[0040] Fig.12 It is a schematic block diagram of a device for detecting the insulation status of a battery provided in an embodiment of the present application.

[0041] Fig.13 It is a schematic block diagram of another device for detecting the insulation status of a battery provided in an embodiment of the present application.

[0042] Fig.14 It is a schematic block diagram of another device for detecting the insulation status of a battery provided in an embodiment of the present application.

[0043] In the drawings, the drawings are not drawn to scale. DETAILED DESCRIPTION

[0044] The following detailed description and drawings of the embodiments of the present application are used to illustrate the principles of the present application, but cannot be used to limit the scope of the present application, that is, the present application is not limited to the described embodiments.

[0045] In the description of the present application, it should be noted that the terms "first", "second", "third", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. All technical and scientific terms used in the present application have the same meanings as those commonly understood by technicians in the technical field of the present application; the terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "including" and "having" in the specification and claims of the present application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0046] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of this application. In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0047] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0048] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists, A and B exist, and B exists. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0049] The term "multiple" as used in this application refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple sheets" refers to more than two sheets (including two sheets).

[0050] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0051] In the present application, battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, lithium metal batteries or magnesium-ion batteries, etc., and the embodiments of the present application do not limit this. Battery cells may be cylindrical, flat, rectangular or other shapes, etc., and the embodiments of the present application do not limit this. Battery cells are generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells and soft-pack battery cells, and the embodiments of the present application do not limit this.

[0052] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in the present application may include a battery module or a battery pack. The battery generally includes a box for encapsulating one or more battery cells. The box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

[0053] The battery cell includes an electrode assembly and an electrolyte. The electrode assembly is composed of a positive electrode sheet, a negative electrode sheet and a separator. The battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive electrode collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode collector. The positive electrode collector not coated with the positive electrode active material layer protrudes from the positive electrode collector coated with the positive electrode active material layer. The positive electrode collector not coated with the positive electrode active material layer serves as the positive electrode tab. Taking lithium-ion batteries as an example, the material of the positive electrode collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide. The negative electrode sheet includes a negative electrode collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode collector. The negative electrode collector not coated with the negative electrode active material layer protrudes from the negative electrode collector coated with the negative electrode active material layer. The negative electrode collector not coated with the negative electrode active material layer serves as the negative electrode tab. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon, silicon, lithium metal or lithium alloy, etc. In order to ensure that a large current passes without melting, the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together. The material of the isolation film may be polypropylene (PP) or polyethylene (PE), etc. In addition, the electrode assembly in the embodiment of the present application includes but is not limited to a winding structure or a laminated structure.

[0054] During the use of batteries, batteries or battery modules are usually required to have good insulation properties to improve the reliability of the battery's electrical performance. In some methods for detecting the insulation status of batteries, it is usually necessary to measure the insulation resistance of different positions on the battery or battery module to the ground to determine whether the battery or battery module is in a good insulation state or in a state of insulation failure, or it is necessary to use a sampling resistor to measure the relevant data of the battery through the battery module. This detection method requires manual judgment of the specific detection point, and it also requires multiple measurements to draw a conclusion. In addition, the calculation method is complicated, the detection efficiency is low, and it is easy to make misjudgments. At the same time, directly measuring the insulation resistance of batteries or battery modules whose insulation conditions have not been confirmed may cause electric shock to personnel.

[0055] In view of this, an embodiment of the present application provides a method for detecting the insulation state of a battery. By measuring the voltage of different output poles of a battery or battery module to the housing or to the ground, it is possible to easily determine whether the battery or battery module is in a good insulation state or in an insulation failure state. The method for detecting the insulation state of a battery provided in an embodiment of the present application can be further combined with the number of battery cells in the battery or battery module to determine the location of the insulation failure point. This detection method can quickly determine the location information of the insulation failure through simple measurement and calculation, can improve the efficiency of insulation fault troubleshooting, save time for insulation fault analysis, and can effectively reduce the possibility of electric shock for on-site troubleshooters.

[0056] The technical solutions described in the embodiments of the present application are applicable to various electrical devices using batteries. Electrical devices may be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and electric tools, etc. Vehicles may be fuel vehicles, gas vehicles, or new energy vehicles, and new energy vehicles may be pure electric vehicles, hybrid vehicles, or extended-range vehicles, etc.; spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc.; electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc.; electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. The embodiments of the present application include but are not limited to the above-mentioned electrical devices.

[0057] For the convenience of description, the following embodiments are described by taking the electric device as a vehicle as an example.

[0058] like Figure 1As shown, it is a structural schematic diagram of a vehicle 1 according to an embodiment of the present application. The vehicle 1 may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A motor 90, a controller 80 and a battery 10 may be arranged inside the vehicle 1. The controller 80 is used to control the battery 10 to supply power to the motor 90. For example, a battery 10 may be arranged at the bottom, front or rear of the vehicle 1. The battery 10 may be used to supply power to the vehicle 1. For example, the battery 10 may be used as an operating power source for the vehicle 1, for the circuit system of the vehicle 1, for example, for the working power requirements during the start-up, navigation and operation of the vehicle 1. In another embodiment of the present application, the battery 10 may not only be used as an operating power source for the vehicle 1, but also as a driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0059] In order to meet different power requirements, the battery may include multiple battery cells, wherein the multiple battery cells may be connected in series, in parallel, or in a hybrid connection, wherein the hybrid connection refers to a mixture of series and parallel connections. The battery may also be referred to as a battery pack. Optionally, multiple battery cells may be connected in series, in parallel, or in a hybrid connection to form a battery module, and multiple battery modules may be connected in series, in parallel, or in a hybrid connection to form a battery. In other words, multiple battery cells may be directly connected to form a battery, or may be first connected to form a battery module, and then the battery module may be connected to form a battery.

[0060] For example, Figure 2 The schematic diagram of the structure of a battery 10 according to an embodiment of the present application is shown. The battery 10 may include at least one battery module 200. The battery module 200 includes a plurality of battery cells 20. The battery 10 may also include a box 11, the inside of the box 11 is a hollow structure, and the plurality of battery cells 20 are accommodated in the box 11. Figure 2 A possible implementation of the box 11 of the embodiment of the present application is shown, such as Figure 2 As shown, the box body 11 may include two parts, which are respectively referred to as a first part 111 and a second part 112, and the first part 111 and the second part 112 are buckled together. The shapes of the first part 111 and the second part 112 may be determined according to the shape of the battery module 200 combination, and at least one of the first part 111 and the second part 112 has an opening. For example, Figure 2 As shown, the first part 111 and the second part 112 can both be hollow rectangular parallelepipeds and each has only one open face, the opening of the first part 111 and the opening of the second part 112 are arranged opposite to each other, and the first part 111 and the second part 112 are interlocked to form a box body 11 with a closed chamber.

[0061] For example, unlike Figure 2As shown, only one of the first part 111 and the second part 112 may be a hollow cuboid with an opening, while the other may be in the shape of a plate to cover the opening. For example, here, the second part 112 is a hollow cuboid with only one face as an opening face, and the first part 111 is in the shape of a plate. Then, the first part 111 covers the opening of the second part 112 to form a box 11 with a closed chamber, which can be used to accommodate multiple battery cells 20. Multiple battery cells 20 are connected in parallel, in series, or in a mixed combination and placed in the box 11 formed by the first part 111 and the second part 112 being buckled together.

[0062] Optionally, the battery 10 may also include other structures, which are not described one by one here. For example, the battery 10 may also include a busbar component, which is used to realize electrical connection between multiple battery cells 20, such as parallel connection, series connection, or mixed connection. Specifically, the busbar component can realize electrical connection between the battery cells 20 by connecting the electrode terminals of the battery cells 20. Further, the busbar component can be fixed to the electrode terminals of the battery cells 20 by welding. The electrical energy of multiple battery cells 20 can be further led out through the conductive structure through the box body 11.

[0063] According to different power requirements, the number of battery cells 20 in the battery module 200 can be set to any value. Multiple battery cells 20 can be connected in series, parallel or mixed to achieve a larger capacity or power. Since the number of battery cells 20 included in each battery 10 may be large, in order to facilitate installation, the battery cells 20 are grouped and each group of battery cells 20 constitutes a battery module 200. The number of battery cells 20 included in the battery module 200 is not limited and can be set according to requirements. The battery 10 may include multiple battery modules 200, which can be connected in series, parallel or mixed.

[0064] The method for detecting the insulation state of a battery provided in the embodiment of the present application can be used to detect the insulation state of the battery 10, and can also be used to detect the insulation state of the battery module 200. The embodiment of the present application only takes the detection of the insulation state of the battery module 200 as an example for description.

[0065] Figure 3 It is a schematic block diagram of a method 300 for detecting the insulation status of a battery provided in an embodiment of the present application. The method 300 at least includes the following contents.

[0066] 310. Obtain a first voltage, where the first voltage is a voltage between a first output pole of the battery module to be detected and a shell of the battery module to be detected.

[0067] 320. Obtain a second voltage, where the second voltage is a voltage between a second output pole of the battery module to be detected and a shell of the battery module to be detected.

[0068] 330. Determine the insulation state of the battery module to be detected according to the first voltage and the second voltage.

[0069] The first output pole and the second output pole refer to the total interface for the battery module 200 to output electric energy to the electric device when multiple battery cells in the battery module to be tested are connected in series or in parallel. The first output pole and the second output pole can be positive and negative poles respectively, for example, the first output pole is positive and the second output pole is negative.

[0070] The shell of the battery module to be tested refers to the structure on the battery module to be tested for accommodating the battery cells. The shell can be made of metal material. In the event of insulation failure in the battery module, the electrical energy inside the battery module will be conducted to the shell, making the shell charged.

[0071] Figure 4 1 shows a circuit diagram for detecting the first voltage and the second voltage of the battery module 200 to be detected. The first voltage refers to the voltage between the first output electrode M of the battery module to be detected and the housing of the battery module to be detected. Figure 4 As shown in (a), the voltage measuring device can be connected to the first output pole M of the battery module at one end and connected to the shell or ground of the battery module at the other end, and the measured Ux is the first voltage.

[0072] The second voltage refers to the voltage between the second output electrode N of the battery module to be detected and the shell of the battery module to be detected. Figure 4 As shown in (b), the voltage measuring device can be connected to the second output pole N of the battery module at one end and connected to the shell or ground of the battery module at the other end, and the measured Uy is the second voltage.

[0073] In the embodiment of the present application, the first voltage and the second voltage are measured separately. Specifically, when measuring the first voltage, the second output pole N and the housing of the battery module are not connected; when measuring the second voltage, the first output pole M and the housing of the battery module are not connected.

[0074] In some embodiments, the voltage measuring device for measuring the first voltage and / or the second voltage may be, for example, a multimeter.

[0075] According to the obtained values ​​of the first voltage and the second voltage, the insulation state of the battery module to be tested can be determined, wherein the insulation state of the battery module to be tested may include a good insulation state and a failed insulation state. The good insulation state refers to a state in which the insulation structure in the battery module is not damaged and the shell is not charged. In this state, the battery module can normally provide electrical energy to the electrical device. The failed insulation state refers to a state in which the shell of the battery module is charged when the charged structure in the battery module is in contact with the shell, or when creepage occurs inside the battery module. In this state, the battery module is not suitable for continuing to provide electrical energy to the electrical device and needs to be repaired or scrapped.

[0076] It should be understood that the embodiment of the present application does not limit the order in which the first voltage and the second voltage are obtained.

[0077] By determining the insulation state of the battery module to be detected by the values ​​of the first voltage and the second voltage, it is possible to easily determine whether the battery or battery module is in a good insulation state or in a failed insulation state, which is beneficial to improving the efficiency of insulation fault troubleshooting. At the same time, this method can reduce the contact between the troubleshooting personnel and the battery module to be detected, and reduce the possibility of electric shock to the on-site troubleshooting personnel.

[0078] According to some embodiments of the present application, optionally, when the first voltage is 0 and the second voltage is 0, it is determined that the battery module to be detected is in an insulated state.

[0079] The first voltage being 0 indicates that no loop is formed between the first output pole M of the battery module to be detected and the shell, and the potential difference between the first output pole M and the shell is 0. The second voltage being 0 indicates that no loop is formed between the second output pole N of the battery module to be detected and the shell, and the potential difference between the second output pole N and the shell is 0. When both the first voltage and the second voltage are 0, it indicates that the shell is not charged, and it can be determined that the battery module to be detected is in an insulated state, that is, a well-insulated state.

[0080] It should be understood that “0” does not mean being equal in a strict sense, but is within an allowable error range, for example, within a certain measurement error range.

[0081] By combining the first voltage and the second voltage to determine the insulation state of the battery module to be detected, a battery module with good insulation can be easily and quickly checked out, which is beneficial to improving the efficiency of insulation fault troubleshooting.

[0082] According to some embodiments of the present application, optionally, when the first voltage is greater than a first threshold and / or the second voltage is greater than the first threshold, it is determined that the battery module to be detected is in a state of insulation failure.

[0083] The first threshold value may be 0. Optionally, the first threshold value may be a voltage value of a battery cell in the battery module.

[0084] When the first voltage is greater than the first threshold, it indicates that a loop is formed between the first output pole M and the shell, and a potential difference is formed between the shell and the first output pole M. In this case, whether the second voltage is greater than the first threshold or not, it can be indicated that the shell is charged and the battery module to be detected is in a state of insulation failure.

[0085] When the second voltage is greater than the first threshold, it indicates that a loop is formed between the second output pole N and the shell, and a potential difference is formed between the shell and the second output pole N. In this case, regardless of whether the first voltage is greater than the first threshold, it can be indicated that the shell is charged and the battery module to be detected is in a state of insulation failure.

[0086] When both the first voltage and the second voltage are greater than the first threshold, it means that the shell can form a circuit with both the first voltage and the second voltage. In this case, it can be determined that there is an area of ​​insulation failure in the battery module to be tested, and the battery module to be tested is in a state of insulation failure.

[0087] In an embodiment of the present application, if at least one of the first voltage and the second voltage is greater than the first threshold, it can be determined that the battery module to be detected is in a state of insulation failure. This detection method can quickly and efficiently determine the battery module in a state of insulation failure, thereby improving the efficiency of insulation fault troubleshooting.

[0088] According to some embodiments of the present application, optionally, the battery module to be detected includes a plurality of battery cells. The present application embodiment provides another method 400 for detecting the insulation state of a battery, such as Figure 5 As shown, method 400 includes at least the following contents.

[0089] 410. Obtain a first voltage, where the first voltage is a voltage between a first output pole M of the battery module to be detected and a shell of the battery module to be detected.

[0090] 420. Obtain a second voltage, where the second voltage is a voltage between a second output pole N of the battery module to be detected and a shell of the battery module to be detected.

[0091] 430. Obtain the number of battery cells.

[0092] 440. Determine a first battery cell according to the first voltage, the second voltage, and the number of battery cells, where the first battery cell is a battery cell with insulation failure among the multiple battery cells.

[0093] Step 410 and step 420 are the same as step 310 and step 320 in method 300 and are not described again herein.

[0094] In step 430, the number of battery cells refers to the number of battery cells in the battery module to be measured. In some embodiments, the battery cells can be obtained by manual counting. Optionally, in battery modules of the same specification, the number of battery cells is fixed, and the number of battery cells can be obtained according to the specifications or identification of the battery module.

[0095] It should be understood that the embodiment of the present application does not limit the order of obtaining the first voltage, the second voltage and the number of battery cells.

[0096] The first battery cell refers to a battery cell near the insulation failure point in the battery module to be detected. In other words, the first battery cell can be determined according to the first voltage, the second voltage and the number of battery cells, and the insulation failure point can be specifically located on the first battery cell.

[0097] In step 440, the position of the first battery cell can be determined only by the first voltage, the second voltage and the number of battery cells, or the third voltage can be further measured to determine the specific position of the first battery cell based on the first voltage, the second voltage, the third voltage and the number of battery cells.

[0098] The position of the first battery cell where insulation failure occurs can be determined by the first voltage, the second voltage and the number of battery cells, which is helpful for quickly locating the insulation failure point and improving the efficiency of troubleshooting insulation faults.

[0099] According to some embodiments of the present application, optionally, step 440 may specifically include at least part of the following contents.

[0100] 441. Determine the number of battery cells between the first battery cell and the first output electrode according to a proportional relationship between the first voltage and the second voltage.

[0101] Optionally, 442 , according to a proportional relationship between the first voltage and the second voltage, determine the number of battery cells between the first battery cell and the second output electrode.

[0102] Taking the example of multiple battery cells in a battery module to be tested being connected in series, when insulation failure occurs in the battery module, the potential at the insulation failure point is close to 0, the value of the first voltage is approximately equal to the voltage of the battery cell between the first output pole M and the insulation failure point, and the value of the second voltage is approximately equal to the voltage of the battery cell between the second output pole N and the insulation failure point. Then, based on the proportional relationship between the first voltage and the second voltage, the number of battery cells between the first output pole M and the insulation failure point and the number of battery cells between the second output pole N and the insulation failure point can be determined. Combined with the total number of battery cells in the battery module to be tested, the position of the first battery cell among the multiple battery cells can be determined.

[0103] Specifically, the first battery cell may be determined according to the following formula (1).

[0104]

[0105] The first battery cell is the m1th battery cell starting from the first output pole, Ux is the first voltage, Uy is the second voltage, and n is the number of battery cells. It should be understood that m1 is the value rounded up to the integer of the calculation result of Ux / (Ux+Uy)·n.

[0106] Optionally, the first battery cell may be determined according to the following formula (2).

[0107]

[0108] The first battery cell is the m2 th battery cell counted from the second output pole, Ux is the first voltage, Uy is the second voltage, and n is the number of battery cells.

[0109] Optionally, m1 and m2 may be obtained simultaneously to verify the position of the first battery cell among the plurality of battery cells.

[0110] Figure 6 The method of measuring relevant data when insulation failure occurs in the battery module to be detected is shown. Specifically, Figure 6 The battery module 200 to be tested includes a plurality of battery cells. Figure 6 Only battery cells 201, 202 and 203 are shown. There is an insulation failure point A on the battery cell 202 that is connected to the housing, and Ux is the voltage value between the insulation failure point A and the first output pole M; Uy is the voltage value between the insulation failure point A and the second output pole N.

[0111] In some embodiments, the average voltage u of the battery cells is data that can be directly obtained, and the number n of the battery cells can be obtained by the average voltage u of the battery cells. In this case, the voltage U between the first output pole M and the second output pole N can be further measured, and the formula n=U / u can be substituted into the above formula (1) or formula (2) to obtain m1 or m2.

[0112] The battery cell with insulation failure in the battery module to be detected is determined by the proportional relationship between the first voltage and the second voltage. The measurement data is relatively small and the calculation method is simple. The battery cell with insulation failure can be determined without frequently changing the measurement point, which is conducive to quickly determining the insulation failure point, thereby improving the efficiency of troubleshooting insulation failure faults.

[0113] According to some embodiments of the present application, optionally, the present application embodiment provides another method 500 for detecting the insulation state of a battery, such as Figure 7 As shown, method 500 includes at least the following contents.

[0114] 510. Obtain a first voltage, where the first voltage is a voltage between a first output electrode of the battery module to be detected and a shell of the battery module to be detected.

[0115] 520. Obtain a second voltage, where the second voltage is a voltage between a second output pole of the battery module to be detected and a shell of the battery module to be detected.

[0116] 530. Obtain the number of battery cells.

[0117] 540. Obtain a third voltage, where the third voltage is a voltage between the first output pole and the second output pole.

[0118] 550. Determine a first battery cell according to the first voltage, the second voltage, the third voltage, and the number of battery cells.

[0119] Steps 510 to 530 are the same as steps 410 to 430 in method 400 and are not described again herein.

[0120] In step 540, the third voltage may refer to the voltage value between the first output electrode M and the second output electrode N of the battery module to be detected. Figure 8 As shown, the first output pole M and the second output pole N can be connected by a voltage measuring device, and the measured voltage U is the third voltage. In the embodiment of the present application, the third voltage is measured separately from the first voltage and the second voltage. Specifically, when measuring the third voltage, the first output pole M and the housing of the battery module are not conductive, and the second output pole N and the housing of the battery module are not conductive.

[0121] In step 550, the third voltage can be used as a judgment condition to assist in determining the degree of insulation failure of the battery module to be detected. Specifically, when the sum of the first voltage and the second voltage is greater than 0 and less than the third voltage, it means that there is a large resistance between the connection between the insulation failure point in the battery module to be detected and the shell, and the severity of the insulation failure is small; when the sum of the first voltage and the second voltage is equal to the third voltage, it means that there is good contact between the connection between the insulation failure point in the battery module to be detected and the shell, and the severity of the insulation failure is large.

[0122] In the embodiment of the present application, the third voltage refers to the total voltage of all battery cells in the battery module to be detected. For example, the battery module to be detected includes n battery cells, and n is a positive integer greater than or equal to 2. In the case where n battery cells are connected in series, the third voltage is the total voltage of the n battery cells. In step 550, "equal to the third voltage" is not strictly equal. Within a certain range, "approximately equal to the third voltage" can also be considered as "equal to the third voltage". Specifically, within a range greater than or equal to the total voltage of (n-1) battery cells, it can be considered as "equal to the third voltage".

[0123] In some embodiments, the third voltage may also be used as a calculation parameter to determine the position of the first battery cell in the battery module to be detected.

[0124] By further measuring the value of the third voltage, the insulation failure of the battery module to be tested can be preliminarily determined, which is conducive to improving the efficiency of insulation fault troubleshooting. At the same time, corresponding protective measures can also be taken during subsequent testing or maintenance to reduce the possibility of electric shock to on-site investigators.

[0125] According to some embodiments of the present application, optionally, when the sum of the first voltage and the second voltage is equal to the third voltage, step 550 in method 500 may specifically include at least part of the following contents.

[0126] 551. Determine the number of battery cells that are located between the first battery cell and the first output electrode according to the first voltage, the third voltage, and the number of battery cells.

[0127] Optionally, 552 , determine the number of battery cells that are located between the first battery cell and the second output electrode according to the second voltage, the third voltage, and the number of battery cells.

[0128] When the sum of the first voltage and the second voltage is equal to the third voltage, the proportional relationship between the first voltage and the third voltage can be used to determine the proportional relationship between the number of battery cells at the first battery cell distance from the first output pole and the total number of battery cells in the battery module to be tested, thereby determining the specific number of battery cells at the first battery cell distance from the first output pole.

[0129] Specifically, in the case of Ux+Uy=U, the first battery cell may be determined according to the following formula (3).

[0130]

[0131] The first battery cell is the m1th battery cell counted from the first output pole M, Ux is the first voltage, Uy is the second voltage, U is the voltage between the first output pole and the second output pole, and n is the number of battery cells.

[0132] Optionally, the proportional relationship between the second voltage and the third voltage can be used to determine the proportional relationship between the number of battery cells at the first battery cell distance from the second output pole and the total number of battery cells in the battery module to be tested, thereby determining the specific number of battery cells at the first battery cell distance from the second output pole N.

[0133] Specifically, in the case of Ux+Uy=U, the first battery cell may be determined according to the following formula (4).

[0134]

[0135] The first battery cell is the m2th battery cell counted from the second output pole, Ux is the first voltage, Uy is the second voltage, U is the voltage between the first output pole and the second output pole, and n is the number of battery cells.

[0136] Optionally, m1 and m2 may be obtained simultaneously to verify the position of the first battery cell among the plurality of battery cells.

[0137] When the sum of the first voltage and the second voltage is equal to the third voltage, the third voltage can be used as a calculation parameter to determine the position of the first battery cell in the battery module to be detected. On the one hand, the third voltage is a roughly constant fixed value, the measurement result is more accurate, and the accuracy of the calculation result can be improved; on the other hand, the introduction of the third voltage can simplify the calculation process, quickly determine the insulation failure point in the battery module to be detected, and improve the efficiency of insulation fault detection.

[0138] According to some embodiments of the present application, optionally, the battery module to be detected includes a plurality of battery cells. The present application embodiment provides another method 600 for detecting the insulation state of the battery, such as Fig. 9 As shown, method 600 includes at least the following contents.

[0139] 610. Obtain a first voltage, where the first voltage is a voltage between a first output pole M of the battery module to be detected and a shell of the battery module to be detected.

[0140] 620. Obtain a second voltage, where the second voltage is a voltage between a second output pole N of the battery module to be detected and a shell of the battery module to be detected.

[0141] 630. Obtain a third voltage, where the third voltage is a voltage between the first output pole and the second output pole.

[0142] 640. Determine a first battery cell according to the first voltage, the second voltage, and the third voltage, where the first battery cell is a battery cell with insulation failure among the multiple battery cells.

[0143] Steps 610 to 630 are the same as step 510 , step 520 , and step 540 in method 500 , and are not described in detail herein.

[0144] In step 640, the position of the first battery cell may be determined only based on the first voltage, the second voltage, and the third voltage, or may be further determined in combination with the number of battery cells. In some embodiments, the third voltage may determine the insulation failure of the battery module to be detected in the judgment condition, and the specific position of the first battery cell among the multiple battery cells may be determined specifically based on the first voltage and the second voltage.

[0145] This can quickly locate the insulation failure point in the battery module to be tested, further reduce the amount of calculation, and help improve the efficiency of troubleshooting insulation failure faults.

[0146] According to some embodiments of the present application, optionally, step 640 in method 600 may specifically include at least part of the following contents.

[0147] 641. When the second voltage is less than the first threshold and the first voltage is equal to the third voltage, the first battery cell is a battery cell connected to the second output electrode.

[0148] Optionally, 642 , when the first voltage is less than the first threshold and the second voltage is equal to the third voltage, the first battery cell is a battery cell connected to the first output electrode.

[0149] In step 641, the second voltage is less than the first threshold value and the first voltage is equal to the third voltage, which indicates that the potentials of the second output pole N and the shell are equal, and the potential difference between the first output pole M and the shell is equal to the total voltage of the battery module to be tested. The location where the insulation failure occurs in the battery module to be tested is located near the second output pole N, for example, a battery cell directly connected to the second output pole N, or the second output pole N itself has an insulation failure.

[0150] Optionally, in step 642, the first voltage is less than the first threshold value and the second voltage is equal to the third voltage, which may indicate that the potentials of the first output pole M and the shell are equal, and the potential difference between the second output pole N and the shell is equal to the total voltage of the battery module to be tested. In this case, the location where the insulation failure occurs in the battery module to be tested is located near the first output pole M, for example, a battery cell directly connected to the first output pole M, or the first output pole M itself has an insulation failure.

[0151] It should be understood that the first threshold in step 641 and step 642 may be 0. Alternatively, the first threshold may be the voltage value of a battery cell in the battery module.

[0152] In the embodiment of the present application, the position of the insulation failure point can be determined only by the measurement results of the first voltage, the second voltage and the third voltage, which can achieve rapid positioning of the insulation failure point and help improve the efficiency of troubleshooting insulation faults.

[0153] According to some embodiments of the present application, optionally, the present application embodiment provides another method 700 for detecting the insulation state of a battery, such as Fig.10 As shown, method 700 includes at least part of the following.

[0154] 710. Execute method 300, 400, 500 or 600.

[0155] 720. Obtain a first resistance between the first output electrode and the shell of the battery module to be detected, and verify the insulation state of the battery module to be detected according to the first resistance.

[0156] Optionally, 730 , a second resistance between the second output pole and the shell of the battery module to be detected is obtained, and the insulation state of the battery module to be detected is verified according to the second resistance.

[0157] In step 710 , method 300 , 400 , 500 or 600 has been described in detail above and will not be repeated here.

[0158] In the case of insulation failure in the battery module to be detected, the resistance between the first output pole M and the shell of the battery module to be detected will be significantly smaller than the resistance between the first output pole M and the shell of the battery module to be detected in the insulated state. Therefore, the resistance between the first output pole M and the shell of the battery module to be detected can be detected to verify whether the battery module to be detected is indeed in a state of insulation failure. Among them, the resistance between the first output pole M and the shell of the battery module to be detected is the first resistance. For example, the resistance value of the first resistance of the battery module to be detected in the insulated state is in the megohm level. If the resistance value of the first resistance actually detected is in the kilohm level, it can be determined that the battery module to be detected is indeed in a state of insulation failure.

[0159] Optionally, it is also possible to verify whether the battery module to be detected is in a state of insulation failure by detecting the resistance value of the second resistor between the second output pole N and the shell of the battery module to be detected.

[0160] Optionally, whether the battery module is in an insulation failure state may be verified by detecting the first resistor and the second resistor.

[0161] By obtaining the resistance values ​​of the first resistor and the second resistor, it can be further verified whether the battery cell to be tested is in a good insulation state or in an insulation failure state, which can reduce the impact of measurement errors on the test results and help improve the accuracy of the test results.

[0162] The present application provides a method 800 for detecting the insulation status of a battery, such as Fig.11 As shown, method 800 includes at least part of the following.

[0163] 810. Measure a first voltage Ux between a first output pole of the battery module to be tested and the housing or the ground.

[0164] 820. Measure a second voltage Uy between the second output pole of the battery module to be tested and the housing or the ground.

[0165] 830. Measure a third voltage U of the first output electrode and the second output electrode of the battery module to be tested.

[0166] 840. Input the number n of battery cells in the battery module to be tested.

[0167] 850. Calculate the average voltage u of the battery cells.

[0168] 860. Determine the insulation state of the battery module to be tested according to the first voltage Ux and the second voltage Uy.

[0169] Specifically, 861, when Ux=0 and Uy=0, there is no insulation failure in the battery module to be tested.

[0170] 862. When Ux is less than the first threshold value and Uy=U, the insulation failure point of the battery module to be detected is located at the first output pole or the battery cell directly connected to the first output pole.

[0171] 863. When 0<Ux<U and 0<Uy<U, m1 is calculated, and the insulation failure point is located at the m1th battery cell from the first output pole; or, m2 is calculated, and the insulation failure point is located at the m2th battery cell from the second output pole.

[0172] 864. When Ux=U and Uy is less than the first threshold, the insulation failure point is at the second output pole or a battery cell directly connected to the second output pole.

[0173] In the case of the above steps 862 to 864, 870, check the insulation failure point to verify that the battery module to be tested is in a state of insulation failure.

[0174] In some embodiments, if there is only one insulation failure point in the battery module to be tested, the specific location of the insulation failure point can be determined by the method provided in the embodiment of the present application. In some embodiments, if there are multiple insulation failure points in the battery module to be tested, the insulation failure point or the first battery cell determined by the method provided in the embodiment of the present application is the insulation failure area with the most serious insulation failure in the battery module to be tested. In some possible implementations, the insulation performance of the insulation failure point can be restored, and the method provided in the embodiment of the present application can be used again to determine the next insulation failure area.

[0175] The present application embodiment provides a device 1200 for detecting the insulation state of a battery, such as Fig.12 As shown, the device 1200 may include a processing module 1210. Specifically, the method for detecting the insulation state of a battery provided in the embodiment of the present application may be executed by an acquisition unit 1211 and a processing unit 1212 in the processing module.

[0176] In an embodiment of the present application, the acquisition unit 1211 is used to acquire a first voltage, which is the voltage between the first output pole of the battery module to be detected and the shell of the battery module to be detected; the acquisition unit 1211 is used to acquire a second voltage, which is the voltage between the second output pole of the battery module to be detected and the shell of the battery module to be detected; the processing unit 1212 is used to determine the insulation state of the battery module to be detected based on the first voltage and the second voltage.

[0177] According to some embodiments of the present application, optionally, the processing unit 1212 is used to determine that the battery module to be detected is in an insulating state when the first voltage is 0 and the second voltage is 0.

[0178] According to some embodiments of the present application, optionally, the processing unit 1212 is used to determine that the battery module to be detected is in a state of insulation failure when the first voltage is greater than a first threshold and / or the second voltage is greater than the first threshold.

[0179] According to some embodiments of the present application, optionally, the acquisition unit 1211 is used to obtain the number of battery cells; the processing unit 1212 is used to determine a first battery cell according to the first voltage, the second voltage and the number of battery cells, and the first battery cell is a battery cell with insulation failure among multiple battery cells.

[0180] According to some embodiments of the present application, optionally, the processing unit 1212 is used to determine the number of battery cells between the first battery cell and the first output pole based on the proportional relationship between the first voltage and the second voltage; and / or, the processing unit 1212 is used to determine the number of battery cells between the first battery cell and the second output pole based on the proportional relationship between the first voltage and the second voltage.

[0181] According to some embodiments of the present application, optionally, the acquisition unit 1211 is used to acquire a third voltage, which is the voltage between the first output pole and the second output pole; the processing unit 1212 is used to determine the first battery cell based on the first voltage, the second voltage, the third voltage and the number of battery cells.

[0182] According to some embodiments of the present application, optionally, the processing unit 1212 is used to determine the number of battery cells that are away from the first battery cell to the first output pole based on the first voltage, the third voltage and the number of battery cells when the sum of the first voltage and the second voltage is equal to the third voltage, and / or determine the number of battery cells that are away from the first battery cell to the second output pole based on the second voltage, the third voltage and the number of battery cells.

[0183] According to some embodiments of the present application, optionally, the acquisition unit 1211 is used to acquire a third voltage, which is the voltage between the first output pole and the second output pole; the processing unit 1212 is used to determine the first battery cell based on the first voltage, the second voltage and the third voltage, and the first battery cell is a battery cell with insulation failure among multiple battery cells.

[0184] According to some embodiments of the present application, optionally, the processing unit 1212 is used to, when the second voltage is less than the first threshold value and the first voltage is equal to the third voltage, the first battery cell is a battery cell connected to the second output pole; or, when the first voltage is less than the first threshold value and the second voltage is equal to the third voltage, the first battery cell is a battery cell connected to the first output pole.

[0185] According to some embodiments of the present application, optionally, the acquisition unit 1211 is used to acquire a first resistance between the first output pole and the shell of the battery module to be detected, and verify the insulation state of the battery module to be detected based on the first resistance; and / or, the acquisition unit 1211 is used to acquire a second resistance between the second output pole and the shell of the battery module to be detected, and verify the insulation state of the battery module to be detected based on the second resistance.

[0186] The present application embodiment provides a device 1300 for detecting the insulation state of a battery, such as Fig.13 As shown, the device 1300 includes a processor 1302 and a memory 1301. The memory 1301 stores instructions. When the instructions are executed by the processor 1302, the device 1300 executes the method described in any of the above embodiments.

[0187] An embodiment of the present application provides a computer-readable storage medium, which stores a computer program. When the computer program is executed, the method described in any of the above embodiments is executed.

[0188] The present application embodiment provides a device 1400 for detecting the insulation state of a battery, such as Fig.14 As shown, taking the first output pole M as the positive pole and the second output pole N as the negative pole as an example, in the process of detecting the battery module 200, the device 1400 can connect the positive pole of the device 1400 to the first output pole M, connect the negative pole of the device 1400 to the second output pole N, and connect the ground interface of the device 1400 to the shell of the battery module 200. The average voltage of the battery cell and / or the number of battery cells can be input in the display screen 1401 of the device 1400. After detection and calculation, the device 1400 can output the voltage of the first output pole M to the shell, the voltage of the second output pole N to the shell, predict whether the battery module 200 is abnormal in insulation, output the number m1 of the battery cell where the insulation failure point is located from the first output pole M, and / or output the number m2 of the battery cell where the insulation failure point is located from the second output pole N. Further, the insulation resistance of the first output pole M to the shell and the insulation resistance of the second output pole N to the shell can be output.

[0189] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A method for detecting the insulation state of a battery, characterized in that: include: Acquire a first voltage, where the first voltage is a voltage between a first output pole of a battery module to be detected and a housing of the battery module to be detected; Acquire a second voltage, where the second voltage is a voltage between a second output pole of the battery module to be detected and a shell of the battery module to be detected; The insulation state of the battery module to be detected is determined according to the first voltage and the second voltage.

2. The method according to claim 1, characterized in that The step of determining the insulation state of the battery module to be detected according to the first voltage and the second voltage includes: When the first voltage is 0 and the second voltage is 0, it is determined that the battery module to be detected is in an insulating state.

3. The method according to claim 1 or 2, characterized in that: The step of determining the insulation state of the battery module to be detected according to the first voltage and the second voltage includes: When the first voltage is greater than a first threshold value and / or the second voltage is greater than a first threshold value, it is determined that the battery module to be detected is in a state of insulation failure.

4. The method according to claim 1 or 3, characterized in that: The battery module to be tested includes a plurality of battery cells, and the method further includes: Obtaining the number of the battery cells; The step of determining the insulation state of the battery module to be detected according to the first voltage and the second voltage includes: A first battery cell is determined according to the first voltage, the second voltage and the number of the battery cells, where the first battery cell is a battery cell with insulation failure among the plurality of battery cells.

5. The method according to claim 4, characterized in that The determining the first battery cell according to the first voltage, the second voltage and the number of the battery cells includes: determining the number of battery cells between the first battery cell and the first output electrode according to a proportional relationship between the first voltage and the second voltage; and / or, The number of battery cells between the first battery cell and the second output electrode is determined according to a proportional relationship between the first voltage and the second voltage.

6. The method according to claim 4, characterized in that The method further comprises: Acquire a third voltage, where the third voltage is a voltage between the first output pole and the second output pole; The determining the first battery cell according to the first voltage, the second voltage and the number of the battery cells includes: A first battery cell is determined according to the first voltage, the second voltage, the third voltage, and the number of the battery cells.

7. The method according to claim 6, characterized in that The determining the first battery cell according to the first voltage, the second voltage, the third voltage and the number of the battery cells includes: When the sum of the first voltage and the second voltage is equal to the third voltage, the number of battery cells at which the first battery cell is away from the first output pole is determined based on the first voltage, the third voltage and the number of battery cells, and / or the number of battery cells at which the first battery cell is away from the second output pole is determined based on the second voltage, the third voltage and the number of battery cells.

8. The method according to claim 1 or 3, characterized in that: The battery module to be tested includes a plurality of battery cells, and the method further includes: Acquire a third voltage, where the third voltage is a voltage between the first output pole and the second output pole; The step of determining the insulation state of the battery module to be detected according to the first voltage and the second voltage includes: A first battery cell is determined according to the first voltage, the second voltage, and the third voltage. The first battery cell is a battery cell with insulation failure among the plurality of battery cells.

9. The method according to claim 8, characterized in that The determining the first battery cell according to the first voltage, the second voltage and the third voltage includes: When the second voltage is less than the first threshold and the first voltage is equal to the third voltage, the first battery cell is a battery cell connected to the second output electrode; or, When the first voltage is less than a first threshold and the second voltage is equal to the third voltage, the first battery cell is a battery cell connected to the first output electrode.

10. The method according to any one of claims 1 to 9, characterized in that The method further comprises: Acquire a first resistance between the first output pole and the housing of the battery module to be detected, and verify the insulation state of the battery module to be detected according to the first resistance; and / or, A second resistance between the second output pole and the shell of the battery module to be detected is obtained, and the insulation state of the battery module to be detected is verified according to the second resistance.

11. A device for detecting the insulation state of a battery, characterized in that: include: A processing module, wherein the processing module is used to execute the method as claimed in any one of claims 1 to 10.

12. A device for detecting the insulation state of a battery, characterized in that: include: A processor and a memory, wherein the memory stores instructions, and when the instructions are executed by the processor, the device executes the method as claimed in any one of claims 1 to 10.

13. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed, the method according to any one of claims 1 to 10 is executed.

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