Battery insulation failure analysis method, device, battery equipment and computer equipment

Abstract

The present application relates to a method and device for analyzing battery insulation failure, a battery device, and a computer device. In the case of an insulation withstand voltage failure of the battery, analysis can be performed in combination with the total voltage of the battery, the voltage of the total positive electrode to the shell, and the voltage of the total negative electrode to the shell. When the preset identification condition is met, timing starts at a preset duration. If the preset identification condition is maintained within the preset duration, it is determined that the battery has a first-mode insulation failure; otherwise, it is considered that the battery has a second-mode insulation failure. The insulation failure types of the first-mode insulation failure and the second-mode insulation failure are different, and the insulation failure types include single-point insulation failure and multi-point insulation failure. In this way, when the battery has an insulation abnormality, it is possible to automatically analyze and determine whether a single-point insulation failure or a multi-point insulation failure occurs currently in combination with the total voltage of the battery, the voltage of the total positive electrode to the shell, and the voltage of the total negative electrode to the shell, without disassembling the battery, and having a high insulation failure troubleshooting efficiency.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and in particular, to a method and device for analyzing battery insulation failure, a battery device, a computer device, a storage medium, and a computer program product. Background Art

[0002] Due to advantages such as high energy density, rechargeability, safety, and environmental friendliness, secondary batteries represented by lithium batteries have gradually been applied to multiple fields such as energy storage power systems, electric transportation vehicles, military equipment, and aerospace, bringing great convenience in electricity use to people's daily production and life. During the operation of these batteries, insulation failure problems are likely to occur due to reasons such as damage to the insulation layer.

[0003] In the related art, when a battery experiences insulation failure, it is necessary to disassemble the battery for inspection, and the inspection efficiency is relatively low. Summary of the Invention

[0004] Based on this, it is necessary to provide a method and device for analyzing battery insulation failure, a battery device, a computer device, a storage medium, and a computer program product to improve the inspection efficiency of battery insulation failure.

[0005] The present application provides a method for analyzing battery insulation failure, including: when insulation abnormality occurs in the battery, obtaining the total voltage of the battery, the total positive electrode-to-case voltage, and the total negative electrode-to-case voltage; when it is determined that a preset identification condition is met based on the total voltage, the total positive electrode-to-case voltage, and the total negative electrode-to-case voltage, starting timing for a preset duration; when the preset identification condition is maintained within the preset duration, determining that the battery has a first-mode insulation failure; when it is determined that the preset identification condition is not met, or the preset identification condition is not maintained within the preset duration, determining that the battery has a second-mode insulation failure; where the insulation failure types of the first-mode insulation failure and the second-mode insulation failure are different, and the insulation failure types include single-point insulation failure and multi-point insulation failure.

[0006] In the above solution, in the case of an insulation withstand voltage failure of the battery, the total voltage of the battery, the total positive electrode to case voltage, and the total negative electrode to case voltage can be analyzed. When the preset identification conditions are met, timing starts for a preset duration. If the preset identification conditions are still met within the preset duration, it is determined that the battery has a first-mode insulation failure; otherwise, it is considered that the battery has a second-mode insulation failure. Among them, the insulation failure types of the first-mode insulation failure and the second-mode insulation failure are different, and the insulation failure types include single-point insulation failure and multi-point insulation failure. Through this solution, when the battery has an insulation anomaly, the total voltage of the battery, the total positive electrode to case voltage, and the total negative electrode to case voltage can be combined to automatically analyze and determine whether a single-point insulation failure or a multi-point insulation failure occurs currently, without disassembling the battery, and it has a high insulation failure troubleshooting efficiency.

[0007] In some embodiments, when it is determined that the preset identification conditions are met based on the total voltage, the total positive electrode to case voltage, and the total negative electrode to case voltage, and timing starts for a preset duration, it includes: determining the sum of the voltage values of the total positive electrode to case voltage and the total negative electrode to case voltage; when it is determined that the preset identification conditions are met based on the total voltage and the sum of the voltage values, timing starts for a preset duration.

[0008] The above solution combines the total voltage, and the sum of the voltage values of the total positive electrode to case voltage and the total negative electrode to case voltage to check whether the preset identification conditions are met, making the check result more in line with the insulation anomaly condition of the battery and improving the check accuracy.

[0009] In some embodiments, the first-mode insulation failure includes single-point insulation failure, and the method further includes: when the difference between the total voltage and the sum of the voltage values is greater than or equal to zero and less than or equal to the voltage of a single battery cell of the first preset multiple, it is determined that the preset identification conditions are met; the single battery cell voltage is the voltage of a single battery unit in the battery.

[0010] The above solution checks whether the battery has a single-point insulation failure by analyzing whether the difference between the total voltage and the sum of the voltage values is within zero to the voltage of a single battery cell of the first preset multiple, and has a high single-point insulation failure check accuracy.

[0011] In some embodiments, the first-mode insulation failure includes multi-point insulation failure, and the method further includes: when the difference between the total voltage and the sum of the voltage values is greater than the voltage of a single battery cell of the second preset multiple, it is determined that the preset identification conditions are met; the single battery cell voltage is the voltage of a single battery unit in the battery.

[0012] In the above solution, by analyzing whether the difference between the total voltage and the sum of the voltage values is greater than the monomer voltage of the second preset multiple, the method checks whether the battery has multi-point insulation failure, and has high accuracy in checking multi-point insulation failure.

[0013] In some embodiments, when it is determined that the preset identification condition is satisfied according to the total voltage, the total positive electrode to case voltage, and the total negative electrode to case voltage, the method further includes: obtaining the insulation impedance of the battery; when the insulation impedance satisfies the preset impedance condition, determining that the battery has a first-mode insulation failure; when the insulation impedance does not satisfy the preset impedance condition, determining that the battery has a second-mode insulation failure.

[0014] In the above solution, when the preset identification condition is detected to be satisfied, the insulation failure mode analysis is further combined with the insulation impedance of the battery to improve the accuracy of failure analysis.

[0015] In some embodiments, the first-mode insulation failure includes single-point insulation failure, and the method further includes: when the insulation impedance is less than the first preset impedance threshold, determining that the preset impedance condition is satisfied.

[0016] In the above solution, by analyzing whether the insulation impedance is less than the first preset impedance threshold, the method checks whether the battery has single-point insulation failure, and has high accuracy in checking single-point insulation failure.

[0017] In some embodiments, the first-mode insulation failure includes multi-point insulation failure, and the method further includes: when the insulation impedance is less than the second preset impedance threshold, determining that the preset impedance condition is satisfied.

[0018] In the above solution, by analyzing whether the insulation impedance is less than the second preset impedance threshold, the method checks whether the battery has multi-point insulation failure, and has high accuracy in checking multi-point insulation failure.

[0019] In some embodiments, the method further includes: when the battery has single-point insulation failure, obtaining the monomer voltages of the battery cells connected in series in the battery; and determining the battery cell with single-point insulation failure according to the monomer voltages.

[0020] In the above solution, when single-point insulation failure occurs, the monomer voltages of the battery cells can also be combined to locate the battery cell with single-point insulation failure, improving the reliability of insulation failure.

[0021] In some embodiments, determining the battery cell with a single-point insulation failure based on the monomer voltage includes: successively adding up each of the monomer voltages to obtain a sum of the monomer voltages; whenever the sum of the monomer voltages is obtained by addition, subtracting it from the total negative terminal to case voltage; in the case where the difference between the total negative terminal to case voltage and the sum of the monomer voltages is less than a first preset difference threshold, determining that the battery cell corresponding to the monomer voltage currently added has a single-point insulation failure.

[0022] In the above solution, by subtracting the total negative terminal to case voltage from the sum of the accumulated monomer voltages to analyze and determine the battery cell with a single-point insulation failure, it has a high accuracy in locating insulation failure.

[0023] In some embodiments, determining the battery cell with a single-point insulation failure based on the monomer voltage includes: successively adding up each of the monomer voltages to obtain a sum of the monomer voltages; whenever the sum of the monomer voltages is obtained by addition, subtracting it from the total positive terminal to case voltage; in the case where the difference between the total positive terminal to case voltage and the sum of the monomer voltages is less than a second preset difference threshold, determining that the battery cell corresponding to the monomer voltage currently added has a single-point insulation failure.

[0024] In the above solution, by subtracting the total positive terminal to case voltage from the sum of the accumulated monomer voltages to analyze and determine the battery cell with a single-point insulation failure, it has a high efficiency in locating insulation failure.

[0025] The present application also provides a battery insulation failure analysis device, including: a voltage acquisition module, configured to acquire the total voltage, the total positive terminal to case voltage, and the total negative terminal to case voltage of the battery when the battery has insulation abnormality; a voltage analysis module, configured to start timing with a preset duration when it is determined that a preset identification condition is satisfied according to the total voltage, the total positive terminal to case voltage, and the total negative terminal to case voltage; a first failure identification module, configured to determine that the battery has a first-mode insulation failure when the preset identification condition is maintained within the preset duration; a second failure identification module, configured to determine that the battery has a second-mode insulation failure when it is determined that the preset identification condition is not satisfied or the preset identification condition is not maintained within the preset duration; wherein, the insulation failure types of the first-mode insulation failure and the second-mode insulation failure are different, and the insulation failure types include single-point insulation failure and multi-point insulation failure.

[0026] The present application also provides a battery device, including a battery and a battery management system, the battery includes a plurality of serially connected battery cells, each of the battery cells is respectively connected to the battery management system, and the battery management system is configured to execute the steps of the above battery insulation failure analysis method.

[0027] The present application also provides a computer device, including a memory and a processor. The memory stores a computer program, and when the processor executes the computer program, the steps of the above battery insulation failure analysis method are implemented.

[0028] The present application also provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the above battery insulation failure analysis method are implemented.

[0029] The present application also provides a computer program product, including a computer program. When the computer program is executed by a processor, the steps of the above battery insulation failure analysis method are implemented. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present application. Moreover, in all the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0031] Figure 1 It is a schematic flow chart of the battery insulation failure analysis method in some embodiments of the present application;

[0032] Figure 2 It is a schematic flow chart of the battery insulation failure analysis method in some other embodiments of the present application;

[0033] Figure 3 It is a schematic diagram of the equivalent of single-point insulation failure in some embodiments of the present application;

[0034] Figure 4 It is a schematic diagram of the equivalent of multi-point insulation failure in some embodiments of the present application;

[0035] Figure 5 It is a schematic flow chart of the failure analysis in some embodiments of the present application;

[0036] Figure 6 It is a schematic flow chart of the battery insulation failure analysis method in some other embodiments of the present application;

[0037] Figure 7 It is a schematic flow chart of the failure location in some embodiments of the present application;

[0038] Figure 8 It is a schematic flow chart of the failure location in some other embodiments of the present application;

[0039] Figure 9 It is a schematic structural diagram of the battery insulation failure analysis device in some embodiments of the present application;

[0040] Figure 10Schematic structural diagram of the battery insulation failure analysis device in other embodiments of the present application;

[0041] Figure 11 Schematic internal structure diagram of a computer device in some embodiments of the present application. Detailed implementation manners

[0042] Hereinafter, embodiments of the technical solutions of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and thus are only examples and should not be used to limit the protection scope of the present application.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion.

[0044] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of the present application, "a plurality of" means two or more, unless otherwise specifically defined.

[0045] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in connection with the embodiments can be included in at least one embodiment of the present application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0046] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after.

[0047] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two). Similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0048] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0049] Currently, from the perspective of the development of the market situation, the application of batteries is becoming more and more extensive. It is not only applied to energy storage systems such as hydropower, thermal power, wind power, and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric vehicles, as well as in many fields such as military equipment and aerospace. With the continuous expansion of the application fields of batteries, the market demand is also increasing continuously.

[0050] In an actual scenario, batteries are generally built in layers. For example, multiple battery cells can be built into a battery module through series and / or parallel connections, and multiple battery modules can be built into a battery pack through series and / or parallel connections. The battery pack can be used as the driving power source for vehicles such as electric vehicles; multiple battery packs can also be built into an energy storage unit (such as an energy storage cabinet or electrical box) through series and / or parallel connections, so as to be applied in an energy storage system.

[0051] In the same layer, between each battery unit (which can be a single battery cell, a single battery module, etc.) connected in series and / or parallel, it is often necessary to isolate them through an insulating material, and insulation treatment is also performed between the positive and negative electrodes of a single battery unit. However, in the actual use process, due to reasons such as liquid leakage and foreign objects, the battery often fails to insulate, seriously affecting the use safety of the battery.

[0052] Through in-depth research, it is found that when the battery fails to insulate, the battery unit corresponding to the insulation failure position will be grounded through the battery housing, changing the voltage characteristics between the battery units. Therefore, it is possible to consider detecting and analyzing the voltage characteristics between the battery units to determine the specific situation of the battery insulation failure, so that the battery does not need to be disassembled.

[0053] Based on the above considerations, the present application provides a method for analyzing battery insulation failure. In the case of a battery insulation withstand voltage failure, it can be analyzed in combination with the total voltage of the battery, the total positive electrode to case voltage, and the total negative electrode to case voltage. When the preset identification conditions are met, timing starts at a preset duration. If the preset identification conditions are maintained within the preset duration, it is determined that the battery has a first-mode insulation failure; otherwise, it is considered that the battery has a second-mode insulation failure, where the insulation failure types of the first-mode insulation failure and the second-mode insulation failure are different, and the insulation failure types include single-point insulation failure and multi-point insulation failure.

[0054] Through the above solution, when the battery has insulation abnormalities, it can automatically analyze and determine whether there is a single-point insulation failure or a multi-point insulation failure at present by combining the total voltage of the battery, the total positive electrode to case voltage, and the total negative electrode to case voltage, without disassembling the battery, and has a high efficiency in troubleshooting insulation failures.

[0055] The battery insulation failure analysis method of the embodiment of the present application is applied to a battery. Any battery formed by connecting multiple battery units in series can be used. Specifically, it can be applied at the battery pack level. Correspondingly, at this time, the battery unit can be a single battery module or a single battery cell; it can also be applied at the battery module level. Correspondingly, at this time, the battery unit can be a single battery cell.

[0056] The battery in this embodiment can be a power battery used as a power source in transportation tools such as electric vehicles, or can be an energy storage unit used for energy storage in an energy storage scenario, such as an electric cabinet, an electric box, etc. Specifically, it is not limited and can be selected according to actual needs.

[0057] In the solution of this embodiment, the battery should include at least two series-connected battery units. The types of the series-connected battery units can be the same or different, and specifically, it is not limited. For example, in one embodiment, taking the battery pack level as an example, the series-connected battery units can all be single battery cells; or it can include both single battery cells and a structure formed by connecting multiple single battery cells in parallel.

[0058] For the convenience of understanding the technical solution of the present application, in the following embodiments, the battery can be understood as a power battery in an electric vehicle, which includes multiple series-connected battery cells, that is, the battery unit is a single battery cell.

[0059] Please refer to Figure 1 , the present application provides a method for analyzing battery insulation failure, including step 102, step 104, step 106, and step 108.

[0060] Step 102, when the battery has insulation abnormalities, obtain the total voltage of the battery, the total positive electrode to case voltage, and the total negative electrode to case voltage.

[0061] Specifically, insulation anomaly refers to the abnormal insulation performance of the battery, that is, an insulation withstand voltage failure occurs. The total voltage is the sum of the voltages of each battery cell connected in series in the battery. The total positive terminal to case voltage refers to the voltage value between the total positive terminal of the battery and the battery case (referring to the voltage value, excluding the sign); the total negative terminal to case voltage refers to the voltage between the total negative terminal of the battery and the battery case (also excluding the sign).

[0062] It should be noted that in an actual scenario, the monitoring of whether the battery has an insulation anomaly can be carried out in real time. The specific detection method is not unique and will not be limited here. For example, in some embodiments, the insulation impedance of the battery can be monitored in real time. When the insulation impedance is detected to be abnormal, it is considered that the battery has an insulation anomaly. In other embodiments, the insulation anomaly can also be monitored by means of high-voltage DC withstand voltage testing or infrared imaging detection.

[0063] The method for obtaining the total positive terminal to case voltage and the total negative terminal to case voltage is not unique. In one embodiment, voltage detectors can be set between the total positive terminal of the battery and the battery case, and between the total negative terminal of the battery and the battery case, and obtained by the voltage detectors.

[0064] In some embodiments, whether the battery has an insulation anomaly can be achieved through the insulation withstand voltage monitoring of the battery management system, and the total voltage, the total positive terminal to case voltage, and the total negative terminal to case voltage can also be collected and obtained through the battery management system.

[0065] It can be understood that the execution subject of the battery insulation failure analysis method is not unique. In some embodiments, it can be executed by the battery management system configured for the battery. In other embodiments, it can also be implemented by other devices with data processing functions, which will vary according to the different usage scenarios of the battery. For example, in the electric vehicle scenario, the battery insulation failure analysis method can be executed by the vehicle controller, and in the energy storage scenario, the battery insulation failure analysis method can be executed by the local energy management control system, etc., which will not be specifically limited.

[0066] For the convenience of understanding the technical solution of the present application, in the following embodiments, it can be understood that the battery insulation failure analysis method is executed by the battery management system.

[0067] Step 104, when it is determined that the preset identification conditions are met according to the total voltage, the total positive terminal to case voltage, and the total negative terminal to case voltage, start timing for a preset duration.

[0068] Specifically, the preset identification condition is also the conditional relationship that needs to be satisfied among the total voltage, the total positive electrode to case voltage, and the total negative electrode to case voltage when the battery exhibits insulation failure in the first mode. In an actual scenario, if the battery experiences insulation failure in the first mode, the total voltage, the total positive electrode to case voltage, and the total negative electrode to case voltage will necessarily satisfy the preset identification condition. However, when the total voltage, the total positive electrode to case voltage, and the total negative electrode to case voltage satisfy the preset identification condition, it is still necessary to further analyze whether other conditions are also satisfied simultaneously to determine whether the battery has insulation failure in the first mode.

[0069] It should be noted that the magnitude of the preset duration is not unique, as long as it can characterize the phenomenon that after the preset duration, the total voltage, the total positive electrode to case voltage, and the total negative electrode to case voltage satisfy the preset identification condition and enter a stable state. For example, in some embodiments, the preset duration can be set to 5 seconds. In other embodiments, the preset duration can also be set to be greater than or less than 5 seconds, such as 4 seconds, 6 seconds, etc., and there is no specific limitation.

[0070] Step 106, when the preset identification condition is maintained within the preset duration, it is determined that the battery has insulation failure in the first mode.

[0071] Specifically, during the process of timing with the preset duration, the total voltage, the total positive electrode to case voltage, and the total negative electrode to case voltage are combined in real time to check whether the preset identification condition is satisfied. If during this process, the verification result is always that the preset identification condition is satisfied, that is, the duration of satisfying the preset identification condition reaches the preset duration, it will be determined that the battery has insulation failure in the first mode.

[0072] Step 108, when it is determined that the preset identification condition is not satisfied, or when the preset identification condition is not maintained within the preset duration, it is determined that the battery has insulation failure in the second mode.

[0073] Among them, the insulation failure types of the first - mode insulation failure and the second - mode insulation failure are different. The insulation failure types include single - point insulation failure and multi - point insulation failure. Single - point insulation failure means that in the same battery, one of the multiple serially - connected battery cells has an insulation withstand voltage failure phenomenon; multi - point insulation failure means that in the same battery, two or more of the multiple serially - connected battery cells have an insulation withstand voltage failure phenomenon.

[0074] When verifying based on the total voltage, the total positive electrode to case voltage, and the total negative electrode to case voltage of the battery, there will also be situations where the preset identification condition is not satisfied, or during the timing of the preset duration, there will be a situation where it turns into not satisfying the preset identification condition. In either of the above - mentioned situations, it can be considered that the battery has insulation failure in the second mode.

[0075] It should be noted that, depending on the different preset identification conditions, the types of insulation failure in the first mode will also be different. In an actual scenario, if the insulation failure in the first mode represents single-point insulation failure, then the insulation failure in the second mode will represent multi-point insulation failure; and if the insulation failure in the first mode represents multi-point insulation failure, then the insulation failure in the second mode will represent single-point insulation failure.

[0076] In the above solution, in the case of an insulation withstand voltage failure of the battery, the total voltage of the battery, the total positive electrode to case voltage, and the total negative electrode to case voltage can be analyzed in combination. When the preset identification conditions are met, timing starts at a preset duration. If the preset identification conditions are maintained within the preset duration, it is determined that the battery has an insulation failure in the first mode; otherwise, it is considered that the battery has an insulation failure in the second mode. Among them, the types of insulation failure in the first mode and the second mode are different, and the types of insulation failure include single-point insulation failure and multi-point insulation failure. Through this solution, when the insulation of the battery is abnormal, the total voltage of the battery, the total positive electrode to case voltage, and the total negative electrode to case voltage can be combined to automatically analyze and determine whether single-point insulation failure or multi-point insulation failure occurs currently, without disassembling the battery, which has a high efficiency in troubleshooting insulation failure.

[0077] Please refer to Figure 2 , in some embodiments, step 104 includes step 202 and step 204.

[0078] Step 202, determine the sum of the voltage values of the total positive electrode to case voltage and the total negative electrode to case voltage.

[0079] Step 204, when it is determined that the preset identification conditions are met based on the total voltage and the sum of the voltage values, start timing at a preset duration.

[0080] Specifically, after obtaining the total voltage of the battery, the total positive electrode to case voltage, and the total negative electrode to case voltage, first calculate in combination with the total positive electrode to case voltage and the total negative electrode to case voltage to obtain the sum of the voltage values, and then combine the total voltage and the sum of the voltage values to verify whether the preset identification conditions are met.

[0081] It should be noted that when verifying based on the total voltage and the sum of the voltage values, the specific verification method is not unique. In one embodiment, the difference between the total voltage and the sum of the voltage values can be calculated and then compared and analyzed with the preset identification conditions to achieve verification. In another embodiment, it can also be the absolute value of the difference between the two, etc., compared and analyzed with the preset identification conditions, and the specific is not limited.

[0082] In the above solution, by combining the total voltage, and the sum of the voltage values of the total positive electrode to case voltage and the total negative electrode to case voltage, to verify whether the preset identification conditions are met, the verification result is more in line with the insulation abnormal working condition of the battery, improving the verification accuracy.

[0083] In some embodiments, the first-mode insulation failure includes single-point insulation failure, and the method further includes: determining that a preset identification condition is satisfied when the difference between the total voltage and the sum of voltage values is greater than or equal to zero and less than or equal to the single-cell voltage multiplied by a first preset multiple; the single-cell voltage is the voltage of a single battery cell in the battery.

[0084] Specifically, when the battery is in a normal operating state, the sum of the voltage values of the total positive electrode to the case voltage and the total negative electrode to the case voltage should be consistent with the total voltage. Please refer to Figure 3 In the case of single-point insulation failure, the battery cell with single-point insulation failure will be grounded through the battery case. At this time, there is a certain impedance between the battery cell with single-point insulation failure and the battery case, which is equivalent to Figure 3 the resistance R1 in

[0085] Therefore, based on the above scenario and considering reasons such as voltage measurement error, the first preset multiple of the single-cell voltage can be configured to set a voltage threshold range, and combined with the total voltage, the total positive electrode to the case voltage, and the total negative electrode to the case voltage, a preset identification condition is established. Specifically, the preset identification condition is set as 0V ≤ U 总 -(U 总正对壳 +U 总负对壳 ) ≤ Ua, where U 总 represents the total voltage, U 总正对壳 represents the total positive electrode to the case voltage, U 总负对壳 represents the total negative electrode to the case voltage, and Ua represents the single-cell voltage multiplied by the first preset multiple.

[0086] It should be noted that the value of the first preset multiple is not unique. In some embodiments, since it is determined whether the battery has single-point insulation failure at this time, if the single-cell voltages of the failed battery cells are not measured in the total positive electrode to the case voltage and the total negative electrode to the case voltage, the maximum difference between the total voltage and the sum of voltage values will reach the single-cell voltage. Therefore, the first preset multiple can be set to be less than or equal to 1. In other embodiments, considering reasons such as measurement error, the first preset multiple can also be configured to be slightly greater than 1, and the specific selection can be made according to actual requirements.

[0087] For the convenience of understanding the technical solution of the present application, in the following embodiments, the first preset multiple can be understood as 1. Correspondingly, depending on the type of battery cells in the battery, the magnitude of the single-cell voltage will also be different, and the specific configuration can be made according to the actual scenario.

[0088] In some embodiments, the battery cell is a single battery core. Taking LFP (lithium iron phosphate battery core) as an example, the voltage of the battery core is between 2.5V (volt) and 3.65V. To cover the upper limit value of the voltage of the battery core, the single - cell voltage can be configured as 3.65V. In some embodiments, taking NCM (ternary lithium battery core) as an example, the voltage of the battery core is between 2.7V and 4.2V. To cover the upper limit value of the voltage of the battery core, the single - cell voltage can be configured as 4.2V.

[0089] Furthermore, in the actual scenario, considering that the currently common battery cores are all NCM or LFP, in order to cover as many battery core types as possible, the single - cell voltage can be set to 4.2V.

[0090] In the above - mentioned solution, by analyzing whether the difference between the total voltage and the sum of the voltage values is within zero to the single - cell voltage of the first preset multiple, the method checks whether the battery has a single - point insulation failure, and has a high accuracy in checking single - point insulation failure.

[0091] In some embodiments, the first - mode insulation failure includes multi - point insulation failure. The method further includes: when the difference between the total voltage and the sum of the voltage values is greater than the single - cell voltage of the second preset multiple, it is determined that the preset identification condition is met; the single - cell voltage is the voltage of a single battery cell in the battery.

[0092] Specifically, based on the same principle as the above - mentioned embodiments, in the case of multi - point insulation failure of the battery, please refer to Figure 4 , multiple battery cells with insulation failure will all be grounded through the battery housing. At this time, there will be a certain impedance between each battery cell with insulation failure and the battery housing. Taking the insulation failure of two battery cells as an example, the impedance can be equivalent to Figure 4 the two resistors R1 and R2 in

[0093] Therefore, based on the above scenario, considering reasons such as voltage measurement error, the second preset multiple of the single - cell voltage can be configured to set a voltage threshold range. Combining the total voltage, the total positive - terminal - to - housing voltage, and the total negative - terminal - to - housing voltage, a preset identification condition is established. Specifically, in this embodiment, the preset identification condition is set as: U 总 -(U 总正对壳 +U 总负对壳 )>Ub, where U 总 represents the total voltage, U 总正对壳 represents the total positive - terminal - to - housing voltage, U 总负对壳 represents the total negative - terminal - to - housing voltage, and Ub represents the second preset multiple of the single - cell voltage.

[0094] It should be noted that the magnitude of the second preset multiple is not unique. In some embodiments, since it is determined at this time whether the battery has multiple-point insulation failure, if the individual voltages of the failed battery cells are not measured in the total positive electrode-to-case voltage and the total negative electrode-to-case voltage, then the difference between the total voltage and the sum of the voltage values will be greater than the individual voltage. Therefore, the second preset multiple can be set to be greater than or equal to 1. In other embodiments, considering reasons such as measurement errors, the first preset multiple can also be configured to be slightly less than 1, and specific selection can be made in combination with actual requirements.

[0095] It can be understood that the second preset multiple and the first preset multiple can be set to be the same or different, and there is no specific limitation. For the convenience of understanding the technical solution of this application, in the following embodiments, the second preset multiple can be understood as 1. Correspondingly, according to the types of battery cells in the battery, the magnitudes of the individual voltages will also vary, and specific configuration can be made in combination with the actual scenario, which will not be elaborated here.

[0096] In the above solution, by analyzing whether the difference between the total voltage and the sum of the voltage values is greater than the individual voltage of the second preset multiple, it is used to verify whether the battery has multiple-point insulation failure, and has a high accuracy in verifying multiple-point insulation failure.

[0097] Please refer to Figure 5 , in some embodiments, when it is determined that the preset recognition condition is satisfied according to the total voltage, the total positive electrode-to-case voltage, and the total negative electrode-to-case voltage, the method further includes step 502, step 504, and step 506.

[0098] Step 502, obtain the insulation impedance of the battery.

[0099] Step 504, when the insulation impedance satisfies the preset impedance condition, determine that the battery has a first-mode insulation failure.

[0100] Step 506, when the insulation impedance does not satisfy the preset impedance condition, determine that the battery has a second-mode insulation failure.

[0101] Specifically, the insulation impedance is a basic insulation index of the battery cell. After applying a DC voltage to the battery cell and after a certain time polarization process ends, the resistance corresponding to the leakage current flowing through the battery cell is the insulation impedance. The acquisition method of the insulation impedance is not unique. In one embodiment, it can be obtained by real-time monitoring through the battery management system. The preset impedance condition is also the condition that the insulation impedance satisfies when the battery has a first-mode insulation failure.

[0102] Different from the time analysis performed after detecting that the preset recognition condition is satisfied in the above embodiments, in the solution of this embodiment, after detecting that the preset recognition condition is satisfied, the insulation impedance is continuously detected. If the insulation impedance also satisfies the preset impedance condition, it is determined that the first-mode insulation failure has occurred; otherwise, it is considered that the second-mode insulation failure has occurred.

[0103] In the above solution, when detecting that the preset recognition condition is satisfied, the insulation failure mode analysis is further combined with the insulation impedance of the battery to improve the accuracy of failure analysis.

[0104] In some embodiments, the first-mode insulation failure includes single-point insulation failure, and the method further includes: determining that the preset impedance condition is satisfied when the insulation impedance is less than the first preset impedance threshold.

[0105] Specifically, the first preset impedance threshold refers to the maximum impedance value that the battery can reach when a single-point insulation failure occurs in the battery. In the solution of this embodiment, when detecting that the preset recognition condition is satisfied, the insulation impedance is further compared and analyzed with the first preset impedance threshold. If the insulation impedance is less than the first preset impedance threshold, it is considered that the preset impedance condition is satisfied at this time, and the first-mode insulation failure has occurred in the battery, that is, a single-point insulation failure has occurred.

[0106] It should be noted that the magnitude of the first preset impedance threshold is not unique and is not specifically limited, as long as the first preset impedance threshold can reasonably represent the state of abnormal battery insulation. For example, in one embodiment, the first preset impedance threshold can be set to 200 MΩ (megaohm); in other embodiments, the first preset impedance threshold can also be set to be greater than 200 MΩ or less than 200 MΩ.

[0107] The above solution checks whether a single-point insulation failure has occurred in the battery by analyzing whether the insulation impedance is less than the first preset impedance threshold, and has a high accuracy in checking single-point insulation failure.

[0108] In some embodiments, the first-mode insulation failure includes multi-point insulation failure, and the method further includes: determining that the preset impedance condition is satisfied when the insulation impedance is less than the second preset impedance threshold.

[0109] Specifically, the second preset impedance threshold refers to the maximum impedance value that the battery can reach when a multi-point insulation failure occurs in the battery. In the solution of this embodiment, when detecting that the preset recognition condition is satisfied, the insulation impedance is further compared and analyzed with the second preset impedance threshold. If the insulation impedance is less than the second preset impedance threshold, it is considered that the preset impedance condition is satisfied at this time, and the second-mode insulation failure has occurred in the battery, that is, a multi-point insulation failure has occurred.

[0110] It should be noted that the magnitude of the second preset impedance threshold is not unique. It can be set to be the same as the first preset impedance threshold or different from the first preset impedance threshold, and there is no specific limitation. As long as it can reasonably represent the state of battery insulation abnormality, it is acceptable. For example, in one embodiment, the second preset impedance threshold can be set to 200 MΩ; in other embodiments, the second preset impedance threshold can also be set to be greater than 200 MΩ or less than 200 MΩ.

[0111] In the above solution, by analyzing whether the insulation impedance is less than the second preset impedance threshold, it is verified whether the battery has multiple-point insulation failure, and the accuracy of multiple-point insulation failure verification is relatively high.

[0112] Please refer to Figure 6 , in some embodiments, this method further includes step 602 and step 604.

[0113] Step 602: When a single-point insulation failure occurs in the battery, obtain the individual voltages of each battery cell connected in series in the battery.

[0114] Step 604: Determine the battery cell where the single-point insulation failure occurs according to the individual voltages.

[0115] Specifically, in the solution of this embodiment, the battery is specifically a battery of the type where multiple battery cells are connected in series. Among them, the connected battery cells can be the same or different. For example, the connected battery cells can all be single battery cores or single battery packs, or can be a parallel structure that includes both single battery cores and multiple battery cores.

[0116] When a single-point insulation failure occurs in the battery, the individual voltages of each battery cell can be obtained respectively, and then analyzed in combination with the individual voltages. Finally, the abnormal individual voltage can be found, so as to determine the battery cell where the single-point insulation failure occurs, that is, the single-point insulation failure is located.

[0117] It should be noted that in one embodiment, if the battery cell where the single-point insulation failure occurs is a parallel structure of multiple battery cores or a battery pack, a battery module, etc., after the battery cell where the single-point insulation failure is located is determined, other methods are still needed to locate the specific failed battery core.

[0118] For example, when the battery cell where the single-point insulation failure occurs is a battery pack or a battery module, the battery pack or the battery module can be regarded as the battery with insulation abnormality, and the individual battery cores connected in series inside it can be regarded as battery cells, and a similar method as above is used for insulation failure type analysis and location; when the battery cell where the single-point insulation failure occurs is a parallel structure of battery cores, detection can be carried out by means such as disassembly, and there is no limitation here.

[0119] In the above solution, in the case of a single-point insulation failure, the battery cell with the single-point insulation failure can also be located by combining the individual voltages of each battery cell, improving the reliability of insulation failure.

[0120] Please refer to Figure 7 , in some embodiments, step 604 includes step 702, step 704, and step 706.

[0121] Step 702, successively accumulate each individual voltage to obtain the sum of individual voltages.

[0122] Step 704, whenever the sum of individual voltages is obtained by accumulation, subtract it from the total negative terminal to case voltage.

[0123] Step 706, in the case where the difference between the total negative terminal to case voltage and the sum of individual voltages is less than the first preset difference threshold, determine that the battery cell corresponding to the currently accumulated individual voltage has a single-point insulation failure.

[0124] Specifically, in the solution of this embodiment, the single-point insulation failure is located by combining the total negative terminal to case voltage and the sum of individual voltages. Specifically, the corresponding relationship between the individual voltage and the battery cell can be established, and the individual voltages of each battery cell are accumulated in a certain order. Whenever the sum of individual voltages is obtained by accumulation, it will be subtracted from the total negative terminal to case voltage. It can be subtracting the sum of individual voltages from the total negative terminal to case voltage; or subtracting the total negative terminal to case voltage from the sum of individual voltages, then taking the absolute value of the difference, and comparing it with the first preset difference threshold.

[0125] When the difference between the total negative terminal to case voltage and the sum of individual voltages is less than the first preset difference threshold, it is considered that the single battery corresponding to the currently accumulated individual voltage has a single-point insulation failure, realizing the single-point insulation failure location.

[0126] It should be noted that, in one embodiment, each battery cell in the battery can be numbered in sequence from the total positive terminal to the total negative terminal. During the process of accumulation and difference analysis, the individual voltages of each battery cell can be accumulated in the order from the total positive terminal to the total negative terminal, or from the total negative terminal to the total positive terminal.

[0127] It can be understood that the value of the first preset difference threshold is not unique. Specifically, according to the type of battery cell, the first preset difference threshold will also be different. In one embodiment, the first preset difference threshold can be set to be less than or equal to the minimum voltage of the battery cell.

[0128] For example, in one embodiment, taking a battery cell as an example, the cell voltage of LFP is in the range of 2.5V - 3.65V. Correspondingly, the minimum voltage of the battery cell can be set to 2.5V, that is, the first preset difference threshold is set to be less than or equal to 2.5V. In another embodiment, the cell voltage of NCM is in the range of 2.7V - 4.2V. Correspondingly, the minimum voltage of the battery cell can be set to 2.7V, that is, the first preset difference threshold is set to be less than or equal to 2.7V. Further, considering that the currently common battery cells are all NCM or LFP, in order to cover as many cell types as possible, the minimum voltage of the battery cell can be set to 2.5V.

[0129] In the above solution, by taking the difference between the total negative electrode to case voltage and the sum of the accumulated monomer voltages to analyze and determine the battery unit with single - point insulation failure, it has a high accuracy in locating insulation failure.

[0130] Please refer to Figure 8 , in some embodiments, step 604 includes step 702, step 804, and step 806.

[0131] Step 702: Accumulate each monomer voltage in sequence to obtain the sum of monomer voltages.

[0132] Step 804: Whenever the sum of monomer voltages is obtained by accumulation, subtract it from the total positive electrode to case voltage.

[0133] Step 806: When the difference between the total positive electrode to case voltage and the sum of monomer voltages is less than the second preset difference threshold, determine that the battery unit corresponding to the currently accumulated monomer voltage has single - point insulation failure.

[0134] Specifically, similar to the above - mentioned embodiment, this embodiment uses the total positive electrode to case voltage for locating insulation failure, and the specific implementation method is similar to that of locating through the total negative electrode to case voltage above, which will not be elaborated here.

[0135] The setting method of the second preset difference threshold is similar to that of the first preset difference threshold, which will not be elaborated here. The two can be set the same or different, and can be selected according to actual needs.

[0136] In the above solution, by taking the difference between the total positive electrode to case voltage and the sum of the accumulated monomer voltages to analyze and determine the battery unit with single - point insulation failure, it has a high efficiency in locating insulation failure.

[0137] To facilitate understanding of the technical solution of this application, the following will explain this application in combination with more detailed embodiments.

[0138] During the operation of the vehicle, the vehicle system can monitor whether there is an insulation abnormality in the battery (battery pack). Specifically, it can be achieved through methods such as insulation impedance detection and infrared imaging detection. In the case of detecting an insulation abnormality, the battery management system can obtain the total voltage of the battery, the total positive electrode to case voltage, the total negative electrode to case voltage, and the insulation impedance.

[0139] In the case where the insulation failure in the first mode is a single-point insulation failure, the detection logic is as follows:

[0140] The battery management system first determines whether Condition 1 is satisfied. Condition 1 is: 0V ≤ U 总 -(U 总正对壳 +U 总负对壳 ) ≤ 4.2V; if Condition 1 is satisfied, then it determines whether Condition 2 is satisfied. Condition 2 is: the continuous phenomenon of Condition 1 reaches 5 seconds, or the insulation impedance is less than 200 MΩ.

[0141] When both Condition 1 and Condition 2 are satisfied, it is determined that a single-point insulation failure has occurred; when Condition 1 or Condition 2 is not satisfied, it is determined that a multi-point insulation failure has occurred.

[0142] In the case where the insulation failure in the first mode is a multi-point insulation failure, the detection logic is as follows:

[0143] The battery management system first determines whether Condition 1 is satisfied. At this time, Condition 1 is: U 总 -(U 总正对壳 +U 总负对壳 ) > 4.2V; if Condition 1 is satisfied, then it determines whether Condition 2 is satisfied. At this time, Condition 2 is: the continuous phenomenon of Condition 1 reaches 5 seconds, or the insulation impedance is less than 200 MΩ.

[0144] When both Condition 1 and Condition 2 are satisfied, it is determined that a multi-point insulation failure has occurred; when Condition 1 or Condition 2 is not satisfied, it is determined that a single-point insulation failure has occurred.

[0145] In the case of a single-point insulation failure, the battery management system combines the individual voltages of each battery cell (cell) and numbers them in the order from the total positive electrode to the total negative electrode, or from the total negative electrode to the total positive electrode. After that, it can determine the number of UN when the condition U 总负对壳 -(U1 + U2 + U3………UN) < 2V is satisfied, and determine the battery cell corresponding to this number as the battery cell with insulation failure. With this number, the specific failure location point can be located. Or it can determine the number of UN when the condition U 总正对壳 -(U1 + U2 + U3………UN) < 2V is satisfied, and determine the battery cell corresponding to this number as the battery cell with insulation failure. With this number, the specific failure location point can be located.

[0146] It should be understood that although the steps in the flowcharts involved in the above-described embodiments are sequentially shown as indicated by the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless there is a clear indication in this article, there is no strict order restriction for the execution of these steps, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-described embodiments may include multiple steps or multiple stages. These steps or stages are not necessarily executed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be executed alternately or in turn with at least a part of other steps or steps or stages in other steps.

[0147] Based on the same inventive concept, an embodiment of the present application further provides a battery insulation failure analysis device for implementing the battery insulation failure analysis method described above. The solution provided by this device to solve the problem is similar to the solution described in the above method. Therefore, the specific limitations in one or more embodiments of the battery insulation failure analysis device provided below can refer to the limitations on the battery insulation failure analysis method in the above text, and will not be repeated here.

[0148] Please refer to Figure 9 , the present application also provides a battery insulation failure analysis device, including a voltage acquisition module 902, a voltage analysis module 904, a first failure identification module 906, and a second failure identification module 908.

[0149] The voltage acquisition module 902 is used to acquire the total voltage of the battery, the total positive electrode to case voltage, and the total negative electrode to case voltage when the battery has insulation abnormalities; the voltage analysis module 904 is used to start timing with a preset duration when it is determined that the preset identification condition is met based on the total voltage, the total positive electrode to case voltage, and the total negative electrode to case voltage; the first failure identification module 906 is used to determine that the battery has a first-mode insulation failure when the preset identification condition is maintained within the preset duration; the second failure identification module 908 is used to determine that the battery has a second-mode insulation failure when it is determined that the preset identification condition is not met, or the preset identification condition is not maintained within the preset duration; wherein, the insulation failure types of the first-mode insulation failure and the second-mode insulation failure are different, and the insulation failure types include single-point insulation failure and multi-point insulation failure.

[0150] In some embodiments, the voltage analysis module 904 is further used to determine the sum of the voltage values of the total positive electrode to case voltage and the total negative electrode to case voltage; and start timing with a preset duration when it is determined that the preset identification condition is met based on the total voltage and the sum of the voltage values.

[0151] In some embodiments, the voltage analysis module 904 is further configured to determine that the preset identification condition is satisfied when the difference between the total voltage and the sum of the voltage values is greater than or equal to zero and less than or equal to the single-cell voltage of the first preset multiple.

[0152] In some embodiments, the voltage analysis module 904 is further configured to determine that the preset identification condition is satisfied when the difference between the total voltage and the sum of the voltage values is greater than the single-cell voltage of the second preset multiple.

[0153] In some embodiments, the first failure identification module 906 is further configured to obtain the insulation impedance of the battery; determine that the battery has a first-mode insulation failure when the insulation impedance meets the preset impedance condition; and determine that the battery has a second-mode insulation failure when the insulation impedance does not meet the preset impedance condition.

[0154] In some embodiments, the first failure identification module 906 is further configured to determine that the preset impedance condition is satisfied when the insulation impedance is less than the first preset impedance threshold.

[0155] In some embodiments, the first failure identification module 906 is further configured to determine that the preset impedance condition is satisfied when the insulation impedance is less than the second preset impedance threshold.

[0156] Please refer to Figure 10 , in some embodiments, the device further includes a failure location module 1002.

[0157] The failure location module 1002 is configured to obtain the single-cell voltage of each battery unit connected in series in the battery when a single-point insulation failure occurs in the battery; and determine the battery unit where the single-point insulation failure occurs according to the single-cell voltage.

[0158] In some embodiments, the failure location module 1002 is further configured to sequentially accumulate the single-cell voltages to obtain the sum of the single-cell voltages; subtract the sum of the single-cell voltages from the total negative terminal to case voltage every time the sum of the single-cell voltages is obtained; and determine that the battery unit corresponding to the currently accumulated single-cell voltage has a single-point insulation failure when the difference between the total negative terminal to case voltage and the sum of the single-cell voltages is less than the first preset difference threshold.

[0159] In some embodiments, the failure location module 1002 is further configured to sequentially accumulate the single-cell voltages to obtain the sum of the single-cell voltages; subtract the sum of the single-cell voltages from the total positive terminal to case voltage every time the sum of the single-cell voltages is obtained; and determine that the battery unit corresponding to the currently accumulated single-cell voltage has a single-point insulation failure when the difference between the total positive terminal to case voltage and the sum of the single-cell voltages is less than the second preset difference threshold.

[0160] Each module in the above battery insulation failure analysis device can be implemented in whole or in part by software, hardware, or a combination thereof. Each of the above modules can be embedded in the processor of a computer device in hardware form or be independent of it, or can be stored in the memory of the computer device in software form, so that the processor can call and execute the operations corresponding to each of the above modules.

[0161] In the above battery insulation failure analysis device, in the case of a battery insulation withstand voltage failure, it can analyze in combination with the total voltage of the battery, the total positive electrode to case voltage, and the total negative electrode to case voltage of the battery. When the preset identification conditions are met, timing starts for a preset duration. If the preset identification conditions are maintained within the preset duration, it is determined that the battery has a first-mode insulation failure; otherwise, it is considered that the battery has a second-mode insulation failure. Among them, the insulation failure types of the first-mode insulation failure and the second-mode insulation failure are different, and the insulation failure types include single-point insulation failure and multi-point insulation failure. Through this solution, when the battery has an insulation abnormality, it can automatically analyze and determine whether a single-point insulation failure or a multi-point insulation failure occurs currently in combination with the total voltage of the battery, the total positive electrode to case voltage, and the total negative electrode to case voltage of the battery, without disassembling the battery, and has a high insulation failure troubleshooting efficiency.

[0162] This application also provides a battery device, including a battery and a battery management system. The battery includes a plurality of serially connected battery cells, and each battery cell is respectively connected to the battery management system. The battery management system is used to execute the steps of the above battery insulation failure analysis method.

[0163] Specifically, the implementation manner of the battery insulation failure analysis method is as shown in the above various embodiments, and will not be elaborated here. Among them, the battery device can be a power battery or an energy storage battery, and is not specifically limited.

[0164] In the above solution, in the case of a battery insulation withstand voltage failure, it can analyze in combination with the total voltage of the battery, the total positive electrode to case voltage, and the total negative electrode to case voltage of the battery. When the preset identification conditions are met, timing starts for a preset duration. If the preset identification conditions are maintained within the preset duration, it is determined that the battery has a first-mode insulation failure; otherwise, it is considered that the battery has a second-mode insulation failure. Among them, the insulation failure types of the first-mode insulation failure and the second-mode insulation failure are different, and the insulation failure types include single-point insulation failure and multi-point insulation failure. Through this solution, when the battery has an insulation abnormality, it can automatically analyze and determine whether a single-point insulation failure or a multi-point insulation failure occurs currently in combination with the total voltage of the battery, the total positive electrode to case voltage, and the total negative electrode to case voltage of the battery, without disassembling the battery, and has a high insulation failure troubleshooting efficiency.

[0165] In some embodiments, this application also provides a computer device. This computer device can be a terminal, and its internal structure diagram can be as Figure 11As shown in the figure. The computer device includes a processor, a memory, an input / output interface, and a communication interface. Among them, the processor, the memory, and the input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The input / output interface of the computer device is used to exchange information between the processor and external devices. The communication interface of the computer device is used to communicate with external terminals in a wired or wireless manner, and the wireless manner can be implemented through WIFI, a mobile cellular network, NFC (Near Field Communication), or other technologies. When the computer program is executed by the processor, it implements a method for analyzing battery insulation failure.

[0166] Those skilled in the art can understand that Figure 11 the structure shown in the figure is only a block diagram of some structures related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine some components, or have a different component arrangement.

[0167] The present application provides a computer device, including a memory and a processor. The memory stores a computer program. When the processor executes the computer program, the following steps are implemented:

[0168] In the case of insulation abnormality of the battery, obtain the total voltage of the battery, the total positive electrode to case voltage, and the total negative electrode to case voltage; when it is determined that the preset identification condition is met according to the total voltage, the total positive electrode to case voltage, and the total negative electrode to case voltage, start timing with a preset duration; when the preset identification condition is maintained within the preset duration, determine that the battery has a first-mode insulation failure; when it is determined that the preset identification condition is not met, or the preset identification condition is not maintained within the preset duration, determine that the battery has a second-mode insulation failure.

[0169] In one embodiment, when the processor executes the computer program, the following steps are also implemented: determine the sum of the voltage values of the total positive electrode to case voltage and the total negative electrode to case voltage; when it is determined that the preset identification condition is met according to the total voltage and the sum of the voltage values, start timing with a preset duration.

[0170] In one embodiment, when the processor executes the computer program, the following steps are also implemented: when the difference between the total voltage and the sum of the voltage values is greater than or equal to zero and less than or equal to the single-cell voltage of the first preset multiple, determine that the preset identification condition is met.

[0171] In one embodiment, when the processor executes the computer program, the following steps are further implemented: when the difference between the total voltage and the sum of the voltage values is greater than the monomer voltage of the second preset multiple, it is determined that the preset identification condition is satisfied.

[0172] In one embodiment, when the processor executes the computer program, the following steps are further implemented: obtaining the insulation impedance of the battery; when the insulation impedance satisfies the preset impedance condition, it is determined that the battery has a first-mode insulation failure; when the insulation impedance does not satisfy the preset impedance condition, it is determined that the battery has a second-mode insulation failure.

[0173] In one embodiment, when the processor executes the computer program, the following steps are further implemented: when the insulation impedance is less than the first preset impedance threshold, it is determined that the preset impedance condition is satisfied.

[0174] In one embodiment, when the processor executes the computer program, the following steps are further implemented: when the insulation impedance is less than the second preset impedance threshold, it is determined that the preset impedance condition is satisfied.

[0175] In one embodiment, when the processor executes the computer program, the following steps are further implemented: when the battery has a single-point insulation failure, obtaining the monomer voltages of the individual battery cells connected in series in the battery; determining the battery cell that has a single-point insulation failure according to the monomer voltages.

[0176] In one embodiment, when the processor executes the computer program, the following steps are further implemented: sequentially adding up the monomer voltages to obtain the sum of the monomer voltages; whenever the sum of the monomer voltages is obtained by addition, subtracting it from the total negative terminal to case voltage; when the difference between the total negative terminal to case voltage and the sum of the monomer voltages is less than the first preset difference threshold, it is determined that the battery cell corresponding to the currently added monomer voltage has a single-point insulation failure.

[0177] In one embodiment, when the processor executes the computer program, the following steps are further implemented: sequentially adding up the monomer voltages to obtain the sum of the monomer voltages; whenever the sum of the monomer voltages is obtained by addition, subtracting it from the total positive terminal to case voltage; when the difference between the total positive terminal to case voltage and the sum of the monomer voltages is less than the second preset difference threshold, it is determined that the battery cell corresponding to the currently added monomer voltage has a single-point insulation failure.

[0178] In some embodiments, a computer-readable storage medium is provided, on which a computer program is stored, and when the computer program is executed by a processor, the following steps are implemented:

[0179] When the insulation of the battery is abnormal, obtain the total voltage of the battery, the voltage of the total positive electrode to the shell, and the voltage of the total negative electrode to the shell; when it is determined that the preset identification condition is met according to the total voltage, the voltage of the total positive electrode to the shell, and the voltage of the total negative electrode to the shell, start timing for a preset duration; when the preset identification condition is maintained within the preset duration, determine that the battery has a first-mode insulation failure; when it is determined that the preset identification condition is not met, or the preset identification condition is not maintained within the preset duration, determine that the battery has a second-mode insulation failure.

[0180] In one embodiment, when the computer program is executed by the processor, the following steps are further implemented: determine the sum of the voltage values of the voltage of the total positive electrode to the shell and the voltage of the total negative electrode to the shell; when it is determined that the preset identification condition is met according to the total voltage and the sum of the voltage values, start timing for a preset duration.

[0181] In one embodiment, when the computer program is executed by the processor, the following steps are further implemented: when the difference between the total voltage and the sum of the voltage values is greater than or equal to zero and less than or equal to the monomer voltage of the first preset multiple, determine that the preset identification condition is met.

[0182] In one embodiment, when the computer program is executed by the processor, the following steps are further implemented: when the difference between the total voltage and the sum of the voltage values is greater than the monomer voltage of the second preset multiple, determine that the preset identification condition is met.

[0183] In one embodiment, when the computer program is executed by the processor, the following steps are further implemented: obtain the insulation impedance of the battery; when the insulation impedance meets the preset impedance condition, determine that the battery has a first-mode insulation failure; when the insulation impedance does not meet the preset impedance condition, determine that the battery has a second-mode insulation failure.

[0184] In one embodiment, when the computer program is executed by the processor, the following steps are further implemented: when the insulation impedance is less than the first preset impedance threshold, determine that the preset impedance condition is met.

[0185] In one embodiment, when the computer program is executed by the processor, the following steps are further implemented: when the insulation impedance is less than the second preset impedance threshold, determine that the preset impedance condition is met.

[0186] In one embodiment, when the computer program is executed by the processor, the following steps are further implemented: when a single-point insulation failure occurs in the battery, obtain the monomer voltages of the individual battery cells connected in series in the battery; determine the battery cell where the single-point insulation failure occurs according to the monomer voltages.

[0187] In one embodiment, when the computer program is executed by a processor, the following steps are further implemented: successively accumulate each cell voltage to obtain the sum of cell voltages; whenever the sum of cell voltages is obtained by accumulation, subtract it from the total negative terminal to case voltage; in the case where the difference between the total negative terminal to case voltage and the sum of cell voltages is less than the first preset difference threshold, determine that the battery cell corresponding to the currently accumulated cell voltage has a single-point insulation failure.

[0188] In one embodiment, when the computer program is executed by a processor, the following steps are further implemented: successively accumulate each cell voltage to obtain the sum of cell voltages; whenever the sum of cell voltages is obtained by accumulation, subtract it from the total positive terminal to case voltage; in the case where the difference between the total positive terminal to case voltage and the sum of cell voltages is less than the second preset difference threshold, determine that the battery cell corresponding to the currently accumulated cell voltage has a single-point insulation failure.

[0189] In one embodiment, a computer program product is provided, including a computer program, which when executed by a processor, implements the following steps:

[0190] In the case where the battery has an insulation abnormality, obtain the total voltage, the total positive terminal to case voltage, and the total negative terminal to case voltage of the battery; in the case where it is determined that the preset identification condition is satisfied according to the total voltage, the total positive terminal to case voltage, and the total negative terminal to case voltage, start timing with a preset duration; in the case where the preset identification condition is maintained within the preset duration, determine that the battery has a first-mode insulation failure; in the case where it is determined that the preset identification condition is not satisfied, or the preset identification condition is not maintained within the preset duration, determine that the battery has a second-mode insulation failure.

[0191] In one embodiment, when the computer program is executed by a processor, the following steps are further implemented: determine the sum of the voltage values of the total positive terminal to case voltage and the total negative terminal to case voltage; in the case where it is determined that the preset identification condition is satisfied according to the total voltage and the sum of the voltage values, start timing with a preset duration.

[0192] In one embodiment, when the computer program is executed by a processor, the following steps are further implemented: in the case where the difference between the total voltage and the sum of the voltage values is greater than or equal to zero and less than or equal to the first preset multiple of the cell voltage, determine that the preset identification condition is satisfied.

[0193] In one embodiment, when the computer program is executed by a processor, the following steps are further implemented: in the case where the difference between the total voltage and the sum of the voltage values is greater than the second preset multiple of the cell voltage, determine that the preset identification condition is satisfied.

[0194] In one embodiment, when the computer program is executed by a processor, the following steps are further implemented: obtaining the insulation impedance of the battery; determining that the battery has a first-mode insulation failure when the insulation impedance meets a preset impedance condition; and determining that the battery has a second-mode insulation failure when the insulation impedance does not meet the preset impedance condition.

[0195] In one embodiment, when the computer program is executed by a processor, the following steps are further implemented: determining that the preset impedance condition is met when the insulation impedance is less than a first preset impedance threshold.

[0196] In one embodiment, when the computer program is executed by a processor, the following steps are further implemented: determining that the preset impedance condition is met when the insulation impedance is less than a second preset impedance threshold.

[0197] In one embodiment, when the computer program is executed by a processor, the following steps are further implemented: obtaining the cell voltages of the individual battery cells connected in series in the battery when a single-point insulation failure occurs in the battery; and determining the battery cell where the single-point insulation failure occurs based on the cell voltages.

[0198] In one embodiment, when the computer program is executed by a processor, the following steps are further implemented: successively adding up the cell voltages to obtain a sum of cell voltages; subtracting the sum of cell voltages from the total negative terminal-to-case voltage every time the sum of cell voltages is obtained; and determining that the battery cell corresponding to the currently added cell voltage has a single-point insulation failure when the difference between the total negative terminal-to-case voltage and the sum of cell voltages is less than a first preset difference threshold.

[0199] In one embodiment, when the computer program is executed by a processor, the following steps are further implemented: successively adding up the cell voltages to obtain a sum of cell voltages; subtracting the sum of cell voltages from the total positive terminal-to-case voltage every time the sum of cell voltages is obtained; and determining that the battery cell corresponding to the currently added cell voltage has a single-point insulation failure when the difference between the total positive terminal-to-case voltage and the sum of cell voltages is less than a second preset difference threshold.

[0200] 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 computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above methods. Among them, any reference to a memory, database, or other medium used in the embodiments provided in this application can include at least one of non-volatile and volatile memories. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc.

[0201] In the case of an insulation withstanding voltage failure of the battery, the above computer device, storage medium, and computer program product can analyze by combining the total voltage of the battery, the total positive electrode to case voltage, and the total negative electrode to case voltage. When the preset identification conditions are met, timing starts for a preset duration. If the preset identification conditions are maintained within the preset duration, it is determined that the battery has a first-mode insulation failure; otherwise, it is considered that the battery has a second-mode insulation failure. Among them, the insulation failure types of the first-mode insulation failure and the second-mode insulation failure are different, and the insulation failure types include single-point insulation failure and multi-point insulation failure. Through this solution, when the battery has an insulation abnormality, it can automatically analyze and determine whether a single-point insulation failure or a multi-point insulation failure occurs currently by combining the total voltage of the battery, the total positive electrode to case voltage, and the total negative electrode to case voltage, without disassembling the battery, and has a high insulation failure troubleshooting efficiency.

[0202] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the various embodiments of the present application, and they should all be covered within the scope of the claims and the specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery insulation failure analysis method, characterized in that: include: When the battery has insulation abnormality, obtaining the total voltage, the total positive electrode to shell voltage and the total negative electrode to shell voltage of the battery; When it is determined that a preset identification condition is met according to the total voltage, the total positive electrode to shell voltage, and the total negative electrode to shell voltage, starting timing with a preset time length; When the preset identification condition is satisfied within the preset time period, determining that the first mode insulation failure occurs in the battery; When it is determined that the preset identification condition is not met, or the preset identification condition is not maintained to be met within the preset time, it is determined that the battery has a second mode insulation failure; wherein the insulation failure types of the first mode insulation failure and the second mode insulation failure are different, and the insulation failure types include single-point insulation failure and multi-point insulation failure; In the case of a single-point insulation failure in the battery, obtaining a single cell voltage of each battery cell connected in series in the battery; the single cell voltage is the voltage of a single battery cell; Accumulating the voltages of the monomers in sequence; Whenever the sum of the single cell voltages is accumulated, it is subtracted from the total negative electrode-to-shell voltage. When the difference between the total negative electrode-to-shell voltage and the sum of the single cell voltages is less than a first preset difference threshold, it is determined that the battery cell corresponding to the currently accumulated single cell voltage has a single-point insulation failure; or, whenever the sum of the single cell voltages is accumulated, it is subtracted from the total positive electrode-to-shell voltage. When the difference between the total positive electrode-to-shell voltage and the sum of the single cell voltages is less than a second preset difference threshold, it is determined that the battery cell corresponding to the currently accumulated single cell voltage has a single-point insulation failure.

2. The battery insulation failure analysis method according to claim 1, characterized in that: The method of starting timing at a preset time length when determining that a preset identification condition is satisfied according to the total voltage, the total positive electrode to shell voltage, and the total negative electrode to shell voltage comprises: Determining the sum of the voltage values ​​of the total positive electrode to shell voltage and the total negative electrode to shell voltage; When it is determined that a preset identification condition is satisfied according to the total voltage and the sum of the voltage values, timing starts with a preset duration.

3. The battery insulation failure analysis method according to claim 2, characterized in that: The first mode insulation failure includes a single point insulation failure, and the method further includes: In a case where the difference between the total voltage and the sum of the voltage values ​​is greater than or equal to zero and less than or equal to a first preset multiple of the single cell voltage, it is determined that the preset identification condition is satisfied.

4. The battery insulation failure analysis method according to claim 2, characterized in that: The first mode insulation failure includes a multi-point insulation failure, and the method further includes: When the difference between the total voltage and the sum of the voltage values ​​is greater than a second preset multiple of the single cell voltage, it is determined that the preset identification condition is met.

5. The battery insulation failure analysis method according to claim 1, characterized in that: In the case where it is determined that a preset identification condition is met according to the total voltage, the total positive electrode to shell voltage, and the total negative electrode to shell voltage, the method further includes: Obtaining the insulation resistance of the battery; When the insulation impedance meets a preset impedance condition, determining that a first mode insulation failure occurs in the battery; When the insulation impedance does not meet the preset impedance condition, it is determined that a second mode insulation failure occurs in the battery.

6. The battery insulation failure analysis method according to claim 5, characterized in that: The first mode insulation failure includes a single point insulation failure, and the method further includes: When the insulation impedance is less than a first preset impedance threshold, it is determined that the preset impedance condition is met.

7. The battery insulation failure analysis method according to claim 5, characterized in that: The first mode insulation failure includes a multi-point insulation failure, and the method further includes: When the insulation impedance is less than a second preset impedance threshold, it is determined that the preset impedance condition is met.

8. A battery insulation failure analysis device, characterized in that: include: A voltage acquisition module, used for acquiring the total voltage, the total positive electrode to shell voltage and the total negative electrode to shell voltage of the battery when an insulation abnormality occurs in the battery; A voltage analysis module, configured to start timing at a preset time length when it is determined that a preset identification condition is met according to the total voltage, the total positive electrode-to-shell voltage, and the total negative electrode-to-shell voltage; A first failure identification module, configured to determine that a first mode insulation failure occurs in the battery when the preset identification condition is satisfied within the preset time period; A second failure identification module is used to determine that a second mode insulation failure occurs in the battery when it is determined that the preset identification condition is not met or the preset identification condition is not maintained within the preset time period; wherein the insulation failure types of the first mode insulation failure and the second mode insulation failure are different, and the insulation failure types include single-point insulation failure and multi-point insulation failure; A failure location module is used to obtain the cell voltage of each battery cell connected in series in the battery when a single-point insulation failure occurs in the battery; the cell voltage is the voltage of a single battery cell; and the cell voltages are accumulated in sequence; Whenever the sum of the single cell voltages is accumulated, it is subtracted from the total negative electrode-to-shell voltage. When the difference between the total negative electrode-to-shell voltage and the sum of the single cell voltages is less than a first preset difference threshold, it is determined that the battery cell corresponding to the currently accumulated single cell voltage has a single-point insulation failure; or, whenever the sum of the single cell voltages is accumulated, it is subtracted from the total positive electrode-to-shell voltage. When the difference between the total positive electrode-to-shell voltage and the sum of the single cell voltages is less than a second preset difference threshold, it is determined that the battery cell corresponding to the currently accumulated single cell voltage has a single-point insulation failure.

9. A battery device, characterized in that: It comprises a battery and a battery management system, wherein the battery comprises a plurality of battery cells connected in series, each of the battery cells is respectively connected to the battery management system, and the battery management system is used to execute the steps of the battery insulation failure analysis method according to any one of claims 1 to 7.

10. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that: When the processor executes the computer program, the steps of the battery insulation failure analysis method according to any one of claims 1 to 7 are implemented.

11. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the battery insulation failure analysis method according to any one of claims 1 to 7 are implemented.

12. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the battery insulation failure analysis method according to any one of claims 1 to 7 are implemented.

Images