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

Abstract

The invention relates to a battery insulation failure analysis method and device, battery equipment and computer equipment, and can analyze by combining the total voltage, the total anode-to-shell voltage and the total cathode-to-shell voltage of a battery under the condition that the battery has an insulation voltage-withstanding fault. When the preset identification condition is met, starting timing according to a preset time length, and when the preset identification condition is maintained to be met within the preset time length, determining that the battery has a first mode insulation failure; otherwise, it is considered that the battery is subjected to 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. Therefore, when the insulation abnormity of the battery occurs, the total voltage, the total positive electrode to shell voltage and the total negative electrode to shell voltage of the battery are combined to automatically analyze and determine whether the current single-point insulation failure or multi-point insulation failure occurs, the battery does not need to be disassembled, and the insulation failure checking efficiency is relatively high.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery insulation failure analysis method, apparatus, battery equipment, computer equipment, storage medium and computer program product. Background Art

[0002] Due to the advantages of high energy density, rechargeable, safe and environmentally friendly, secondary batteries represented by lithium batteries are gradually applied to energy storage power systems, electric vehicles, military equipment, aerospace and other fields, bringing great convenience to people's daily production and life. During operation, these batteries are prone to insulation failure due to reasons such as damage to the insulation layer.

[0003] In the related art, when the insulation of a battery fails, the battery needs to be disassembled for inspection, which has low inspection efficiency. Summary of the invention

[0004] Based on this, it is necessary to propose a battery insulation failure analysis method, device, battery equipment, computer equipment, storage medium and computer program product to improve the efficiency of battery insulation failure detection.

[0005] The present application provides a battery insulation failure analysis method, comprising: in the case of an insulation abnormality in the battery, 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 duration; when the preset identification condition is maintained to be met within the preset duration, determining that a 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 duration, determining that a second mode insulation failure occurs in the battery; 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.

[0006] The above scheme can be combined with the total voltage, total positive electrode to shell voltage and total negative electrode to shell voltage of the battery for analysis when the battery has an insulation withstand voltage failure. When the preset identification conditions are met, the timing starts at the preset time length, and when the preset identification conditions are maintained within the preset time length, 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, 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. Through this scheme, when the battery has insulation abnormality, combined with the total voltage, total positive electrode to shell voltage and total negative electrode to shell voltage of the battery, it can be automatically analyzed to determine whether a single-point insulation failure or a multi-point insulation failure has occurred, without disassembling the battery, and has a high efficiency in troubleshooting insulation failures.

[0007] In some embodiments, when it is determined that a preset identification condition is met based on the total voltage, the total positive electrode to shell voltage and the total negative electrode to shell voltage, the timing is started with a preset duration, including: 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 the preset identification condition is met based on the total voltage and the sum of the voltage values, the timing is started with a preset duration.

[0008] The above scheme combines the total voltage and the sum of the voltage values ​​of the total positive electrode to shell voltage and the total negative electrode to shell voltage to verify whether the preset identification conditions are met, so that the verification result is more in line with the abnormal insulation condition of the battery and the verification accuracy is improved.

[0009] In some embodiments, the first mode insulation failure includes a 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 the voltage values ​​is greater than or equal to zero and less than or equal to a first preset multiple of a single cell voltage; the single cell voltage is the voltage of a single battery cell in the battery.

[0010] The above scheme verifies whether a single-point insulation failure occurs in the battery by analyzing the difference between the total voltage and the sum of the voltage values ​​to see whether it is between zero and a first preset multiple of the single-cell voltage, and has a high single-point insulation failure verification 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 a second preset multiple of a single cell voltage, determining that a preset identification condition is met; the single cell voltage is the voltage of a single battery cell in the battery.

[0012] The above scheme verifies whether the battery has multi-point insulation failure by analyzing whether the difference between the total voltage and the sum of the voltage values ​​is greater than the second preset multiple of the single cell voltage, and has high multi-point insulation failure verification accuracy.

[0013] In some embodiments, when it is determined that a preset identification condition is met based on 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 impedance of the battery; when the insulation impedance meets the preset impedance condition, determining that a first mode insulation failure has occurred in the battery; and when the insulation impedance does not meet the preset impedance condition, determining that a second mode insulation failure has occurred in the battery.

[0014] The above scheme, when the detection meets the preset identification conditions, further combines the insulation impedance of the battery to perform insulation failure mode analysis, thereby improving the accuracy of failure analysis.

[0015] In some embodiments, 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, determining that a preset impedance condition is satisfied.

[0016] The above solution verifies whether a single-point insulation failure occurs in the battery by analyzing whether the insulation impedance is less than a first preset impedance threshold, and has a high single-point insulation failure verification accuracy.

[0017] In some embodiments, 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, determining that a preset impedance condition is satisfied.

[0018] The above scheme verifies whether a battery has a multi-point insulation failure by analyzing whether the insulation impedance is less than a second preset impedance threshold, and has a high accuracy in multi-point insulation failure verification.

[0019] In some embodiments, the method further includes: when a single-point insulation failure occurs in the battery, obtaining a single cell voltage of each battery cell connected in series in the battery; and determining the battery cell where the single-point insulation failure occurs based on the single cell voltage.

[0020] In the case of a single-point insulation failure, the above scheme can also combine the single-cell voltages of each battery cell to locate the battery cell where the single-point insulation failure occurs, thereby improving the reliability of insulation failure.

[0021] In some embodiments, determining a battery cell having a single-point insulation failure based on the single-cell voltage includes: sequentially accumulating the single-cell voltages to obtain a single-cell voltage sum; subtracting the single-cell voltage sum from the total negative-pole-to-shell voltage each time the sum is accumulated; and in the event that the difference between the total negative-pole-to-shell voltage and the single-cell voltage sum is less than a first preset difference threshold, determining that a single-point insulation failure has occurred in the battery cell corresponding to the currently accumulated single-cell voltage.

[0022] The above scheme analyzes and determines the battery cell where single-point insulation failure occurs by subtracting the total negative electrode-to-shell voltage from the accumulated single cell voltage, and has a high insulation failure location accuracy.

[0023] In some embodiments, determining a battery cell having a single-point insulation failure based on the single-cell voltage includes: sequentially accumulating the single-cell voltages to obtain a single-cell voltage sum; subtracting the single-cell voltage sum from the total positive-to-shell voltage each time the sum is accumulated; and determining that a single-point insulation failure has occurred in the battery cell corresponding to the currently accumulated single-cell voltage if the difference between the total positive-to-shell voltage and the single-cell voltage sum is less than a second preset difference threshold.

[0024] The above scheme analyzes and determines the battery cell where single-point insulation failure occurs by subtracting the total positive electrode-to-shell voltage from the accumulated single cell voltage, and has a high insulation failure location efficiency.

[0025] The present application also provides a battery insulation failure analysis device, comprising: a voltage acquisition module, used to acquire the total voltage, total positive electrode to shell voltage and total negative electrode to shell voltage of the battery when an insulation abnormality occurs in the battery; a voltage analysis module, used to start timing with a preset time length when it is determined that a preset identification condition is met based on the total voltage, the total positive electrode to shell voltage and the total negative electrode to shell voltage; a first failure identification module, used to determine that a first mode insulation failure occurs in the battery when the preset identification condition is maintained to be met within the preset time length; a second failure identification module, 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 to be met within the preset time length; 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, wherein the battery includes 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 above-mentioned battery insulation failure analysis method.

[0027] The present application also provides a computer device, including a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the above-mentioned battery insulation failure analysis method when executing the computer program.

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

[0029] The present application also provides a computer program product, including a computer program, which implements the steps of the above-mentioned battery insulation failure analysis method when executed by a processor. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0031] FIG1 is a schematic flow chart of a battery insulation failure analysis method in some embodiments of the present application;

[0032] FIG2 is a schematic diagram of a battery insulation failure analysis method in some other embodiments of the present application;

[0033] FIG3 is an equivalent schematic diagram of single-point insulation failure in some embodiments of the present application;

[0034] FIG4 is an equivalent schematic diagram of multi-point insulation failure in some embodiments of the present application;

[0035] FIG5 is a schematic diagram of a failure analysis process in some embodiments of the present application;

[0036] FIG6 is a schematic flow chart of a battery insulation failure analysis method in some other embodiments of the present application;

[0037] FIG7 is a schematic diagram of a failure location process in some embodiments of the present application;

[0038] FIG8 is a schematic diagram of a failure location process in some other embodiments of the present application;

[0039] FIG9 is a schematic diagram of the structure of a battery insulation failure analysis device in some embodiments of the present application;

[0040] FIG10 is a schematic diagram of the structure of a battery insulation failure analysis device in some other embodiments of the present application;

[0041] FIG. 11 is a schematic diagram of the internal structure of a computer device in some embodiments of the present application. DETAILED DESCRIPTION

[0042] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians 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" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0044] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0045] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may 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 the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0047] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two 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 "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. 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 the specific circumstances.

[0049] At present, judging from the development of the market situation, the application of batteries is becoming more and more extensive. They are not only used in 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, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of battery application areas, the market demand is also constantly expanding.

[0050] In actual scenarios, batteries are generally built in layers. For example, multiple battery cells can be built into a battery module by connecting them in series and / or in parallel, and multiple battery modules can be built into a battery pack by connecting them in series and / or in parallel. The battery pack can be used as a 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 box) by connecting them in series and / or in parallel, and then used in energy storage systems.

[0051] In the same layer, the battery cells (which can be single cells, single battery modules, etc.) connected in series and / or in parallel often need to be isolated by insulating materials, and the positive and negative electrodes of a single battery cell are also insulated. However, in actual use, the battery insulation often fails due to leakage, foreign matter, etc., seriously affecting the safety of battery use.

[0052] After in-depth research, it was found that when the insulation of the battery fails, the battery cell corresponding to the insulation failure position will be grounded through the battery shell, changing the voltage characteristics between the battery cells. Therefore, it is possible to consider testing and analyzing the voltage characteristics between the battery cells to determine the specific circumstances of the insulation failure of the battery, without having to disassemble the battery.

[0053] Based on the above considerations, the present application provides a battery insulation failure analysis method, which can be combined with the total voltage, total positive electrode to shell voltage and total negative electrode to shell voltage of the battery for analysis when the battery has an insulation withstand voltage failure. When the preset identification conditions are met, the timing starts at the preset time length, and when the preset identification conditions are maintained within the preset time length, 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, 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.

[0054] Through the above solution, when an insulation abnormality occurs in the battery, the total voltage of the battery, the total positive electrode to shell voltage and the total negative electrode to shell voltage can be combined to automatically analyze and determine whether a single-point insulation failure or a multi-point insulation failure has occurred. There is no need to disassemble the battery, and the efficiency of insulation failure troubleshooting is high.

[0055] The battery insulation failure analysis method of the embodiment of the present application is applied to any battery as long as it is formed by connecting multiple battery cells in series. Specifically, it can be applied at the battery pack level, and correspondingly, the battery cell can be a single battery module or a single battery cell. It can also be applied at the battery module level, and correspondingly, the battery cell can be a single battery cell.

[0056] The battery of this embodiment can be a power battery used as a power source in vehicles such as electric vehicles, or it can be an energy storage unit used for energy storage in energy storage scenarios, such as an electrical cabinet, an electrical box, etc. There is no specific limitation and the selection can be made based on actual needs.

[0057] In the solution of this embodiment, the battery should include at least two battery cells connected in series, and the types of the battery cells connected in series can be the same or different, and there is no specific limitation. For example, in one embodiment, taking the battery pack level as an example, the battery cells connected in series can all be single cells; they can also include single cells or a structure formed by multiple single cells connected in parallel.

[0058] In order to facilitate understanding of the technical solution of the present application, the battery in the following embodiments can be understood as a power battery in an electric vehicle, which includes a plurality of battery cells connected in series, that is, the battery unit is a single battery cell.

[0059] Please refer to FIG. 1 . The present application provides a battery insulation failure analysis method, including step 102 , step 104 , step 106 , and step 108 .

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

[0061] Specifically, insulation abnormality refers to the abnormal insulation performance of the battery, that is, the 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 shell voltage refers to the voltage value between the total positive electrode of the battery and the battery shell (refers to the voltage value, excluding the sign); the total negative shell voltage refers to the voltage between the total negative electrode of the battery and the battery shell (also excluding the sign).

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

[0063] There is not only one way to obtain the total positive electrode-to-shell voltage and the total negative electrode-to-shell voltage. In one embodiment, a voltage detector can be set between the total positive electrode of the battery and the battery shell, and between the total negative electrode of the battery and the battery shell, and the voltage can be obtained by detection by the voltage detector.

[0064] In some embodiments, whether the battery has insulation abnormalities can be determined through insulation withstand voltage monitoring of the battery management system, and the total voltage, total positive electrode to shell voltage and total negative electrode to shell voltage can also be collected and obtained through the battery management system.

[0065] It is understandable 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 corresponding to the battery. In other embodiments, it can also be implemented by other devices with data processing functions, which will vary depending on the battery usage scenario. 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., without specific limitation.

[0066] In order to facilitate understanding of the technical solution of the present application, the following embodiments can all be understood as the battery insulation failure analysis method being executed by a battery management system.

[0067] Step 104 , when it is determined 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, timing is started with a preset time length.

[0068] Specifically, the preset identification condition is the preset conditional relationship between the total voltage, the total positive electrode to shell voltage and the total negative electrode to shell voltage that needs to be satisfied when the first mode insulation failure occurs in the battery. In actual scenarios, if the first mode insulation failure occurs in the battery, the total voltage, the total positive electrode to shell voltage and the total negative electrode to shell voltage must satisfy the preset identification condition, and when the total voltage, the total positive electrode to shell voltage and the total negative electrode to shell voltage satisfy the preset identification condition, it is necessary to further analyze whether other conditions are satisfied at the same time to determine whether the first mode insulation failure occurs in the battery.

[0069] It should be noted that the preset time length is not unique, as long as it can represent that after the preset time length, the total voltage, the total positive electrode to shell voltage, and the total negative electrode to shell voltage meet the preset identification conditions and enter a stable state. For example, in some embodiments, the preset time length can be set to 5 seconds. In other embodiments, the preset time length can also be set to be greater than or less than 5 seconds, such as 4 seconds, 6 seconds, etc., without specific limitation.

[0070] Step 106 : When the preset identification condition is satisfied for a preset period of time, it is determined that the battery has a first mode insulation failure.

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

[0072] Step 108 : If it is determined that the preset identification condition is not satisfied, or the preset identification condition is not satisfied for a preset period of time, it is determined that the battery has a second mode insulation failure.

[0073] 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. Single-point insulation failure means that in the same battery, one of the multiple battery cells connected in series has an insulation withstand voltage failure; multi-point insulation failure means that in the same battery, two or more of the multiple battery cells connected in series have an insulation withstand voltage failure.

[0074] When checking the total voltage, total positive electrode to shell voltage and total negative electrode to shell voltage of the battery, there may be a situation where the preset identification conditions are not met, or there may be a situation where the preset identification conditions are not met within the preset time. In any of the above situations, it can be considered that the battery has a second mode insulation failure.

[0075] It should be pointed out that the type of first mode insulation failure will be different depending on the preset identification conditions. In actual scenarios, if the first mode insulation failure represents a single-point insulation failure, then the second mode insulation failure will represent a multi-point insulation failure; and if the first mode insulation failure represents a multi-point insulation failure, then the second mode insulation failure will represent a single-point insulation failure.

[0076] The above scheme can be combined with the total voltage, total positive electrode to shell voltage and total negative electrode to shell voltage of the battery for analysis when the battery has an insulation withstand voltage failure. When the preset identification conditions are met, the timing starts at the preset time length, and when the preset identification conditions are maintained within the preset time length, 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, 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. Through this scheme, when the battery has insulation abnormality, combined with the total voltage, total positive electrode to shell voltage and total negative electrode to shell voltage of the battery, it can be automatically analyzed to determine whether a single-point insulation failure or a multi-point insulation failure has occurred, without disassembling the battery, and has a high efficiency in troubleshooting insulation failures.

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

[0078] Step 202, determining the sum of the voltage values ​​of the total positive electrode to shell voltage and the total negative electrode to shell voltage.

[0079] Step 204 , when it is determined that the preset identification condition is met according to the total voltage and the sum of the voltage values, timing is started with a preset duration.

[0080] Specifically, after obtaining the total voltage, total positive electrode-to-shell voltage and total negative electrode-to-shell voltage of the battery, the total positive electrode-to-shell voltage and the total negative electrode-to-shell voltage are first calculated to obtain the sum of the voltage values, and then the total voltage and the sum of the voltage values ​​are combined to verify whether the preset identification conditions are met.

[0081] It should be noted that when the verification is performed based on the total voltage and the sum of the voltage values, the specific verification method is not unique. In one embodiment, the total voltage and the sum of the voltage values ​​may be subtracted and then compared and analyzed with the preset identification conditions to achieve verification. In another embodiment, the absolute value of the difference between the two may be compared and analyzed with the preset identification conditions, which is not specifically limited.

[0082] The above scheme combines the total voltage and the sum of the voltage values ​​of the total positive electrode to shell voltage and the total negative electrode to shell voltage to verify whether the preset identification conditions are met, so that the verification result is more in line with the abnormal insulation condition of the battery and the verification accuracy is improved.

[0083] In some embodiments, the first mode insulation failure includes a single-point insulation failure, and the method further includes: determining that a preset identification condition is met 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 a first preset multiple of the single cell voltage; the single cell voltage is the voltage of a single battery cell in the battery.

[0084] Specifically, when the battery is in normal operation, the sum of the voltage values ​​of the total positive electrode to shell voltage and the total negative electrode to shell voltage should be consistent with the total voltage. Please refer to Figure 3. In the event of a single-point insulation failure, the battery cell with the single-point insulation failure will be grounded through the battery shell. At this time, there is a certain impedance between the battery cell with the single-point insulation failure and the battery shell, which is equivalent to the resistor R1 in Figure 3. Due to the voltage divider effect of the resistor R1, the voltage relationship between the total voltage, the total positive electrode to shell voltage and the total negative electrode to shell voltage will be changed.

[0085] Therefore, based on the above scenario, taking into account the voltage measurement error and other reasons, the single cell voltage of the first preset multiple can be configured to set a voltage threshold range, and the total voltage, the total positive electrode to shell voltage and the total negative electrode to shell voltage are combined to establish a preset identification condition. Specifically, the preset identification condition is set to 0V≤U 总 -(U 总正对壳 +U 总负对壳 )≤Ua, where U 总 Indicates the total voltage, U 总正对壳 Indicates the total positive electrode to shell voltage, U 总负对壳 It represents the total negative electrode to shell voltage, and Ua represents the single cell voltage of the first preset multiple.

[0086] It should be noted that the size of the first preset multiple is not unique. In some embodiments, since it is determined whether a single-point insulation failure occurs in the battery at this time, if the single cell voltage of the failed battery cell is not measured in the total positive electrode-to-shell voltage and the total negative electrode-to-shell voltage, the maximum difference between the total voltage and the sum of the voltage values ​​will reach the single cell voltage, so the first preset multiple can be set to be less than or equal to 1. In other embodiments, considering measurement errors and other reasons, the first preset multiple can also be configured to be slightly greater than 1, and the selection can be made in combination with actual needs.

[0087] To facilitate understanding of the technical solution of the present application, the following embodiments may all be understood as the first preset multiple being 1. Correspondingly, depending on the type of battery cells in the battery, the size of the single cell voltage may also be different, and the specific configuration may be performed in combination with the actual scenario.

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

[0089] Furthermore, in actual scenarios, considering that the more common battery cells are NCM or LFP, in order to cover as many battery cell types as possible, the single cell voltage can be set to 4.2V.

[0090] The above scheme verifies whether a single-point insulation failure occurs in the battery by analyzing the difference between the total voltage and the sum of the voltage values ​​to see whether it is between zero and a first preset multiple of the single-cell voltage, and has a high single-point insulation failure verification accuracy.

[0091] 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 a second preset multiple of the single cell voltage, determining that a 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 embodiment, in the case of multiple insulation failures in the battery, please refer to Figure 4. Multiple battery cells with insulation failures will be grounded through the battery shell. At this time, there will be a certain impedance between each battery cell with insulation failure and the battery shell. Taking the insulation failure of two battery cells as an example, their impedance can be equivalent to the two resistors R1 and R2 in Figure 4. Due to the resistor voltage divider effect, the voltage relationship between the total voltage, the total positive electrode to shell voltage and the total negative electrode to shell voltage will be changed.

[0093] Therefore, based on the above scenario, taking into account the voltage measurement error and other reasons, a second preset multiple of the single cell voltage can be configured to set a voltage threshold range, and the total voltage, the total positive electrode to shell voltage and the total negative electrode to shell voltage are combined to establish a preset identification condition. 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 Indicates the total voltage, U 总正对壳 Indicates the total positive electrode to shell voltage, U 总负对壳 It represents the total negative electrode to shell voltage, and Ub represents the single cell voltage of the second preset multiple.

[0094] It should be noted that the size of the second preset multiple is not unique. In some embodiments, since what is determined at this time is whether the battery has a multi-point insulation failure, if the single cell voltage of the failed battery cell is not measured in the total positive electrode to shell voltage and the total negative electrode to shell voltage, then the difference between the total voltage and the sum of the voltage values ​​will be greater than the single cell voltage. Therefore, the second preset multiple can be set to be greater than or equal to 1. In other embodiments, considering measurement errors and other reasons, the first preset multiple can also be configured to be slightly less than 1, and the specific selection can be made in combination with actual needs.

[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. In order to facilitate understanding of the technical solution of the present application, the following embodiments can understand that the second preset multiple is 1. Correspondingly, depending on the type of battery cells in the battery, the size of the single cell voltage will also be different. It can be configured in combination with the actual scenario, and will not be elaborated here.

[0096] The above scheme verifies whether the battery has multi-point insulation failure by analyzing whether the difference between the total voltage and the sum of the voltage values ​​is greater than the second preset multiple of the single cell voltage, and has high multi-point insulation failure verification accuracy.

[0097] Please refer to FIG. 5 . In some embodiments, when it is determined that the preset identification condition is met based on the total voltage, the total positive electrode to shell voltage and the total negative electrode to shell voltage, the method further includes step 502 , step 504 and step 506 .

[0098] Step 502, obtaining the insulation resistance of the battery.

[0099] Step 504: When the insulation impedance meets a preset impedance condition, it is determined that a first mode insulation failure occurs in the battery.

[0100] Step 506: When the insulation impedance does not meet the preset impedance condition, determine that the battery has a second mode insulation failure.

[0101] Specifically, insulation impedance is a basic insulation indicator of a battery cell. It is measured by applying a DC voltage to the battery cell. After a certain period of time, the polarization process ends. The resistance corresponding to the leakage current flowing through the battery cell is the insulation impedance. There is not only one way to obtain insulation impedance. In one embodiment, it can be obtained by real-time monitoring through a battery management system. The preset impedance condition is the condition that the insulation impedance satisfies when the first mode insulation failure occurs in the battery.

[0102] Unlike the above-mentioned embodiment in which timing analysis is performed after detecting that the preset identification conditions are met, the solution of this embodiment continues to detect the insulation impedance after detecting that the preset identification conditions are met. If the insulation impedance also meets the preset impedance conditions, it is determined that the first mode insulation failure has occurred, otherwise it is considered that the second mode insulation failure has occurred.

[0103] The above scheme, when the detection meets the preset identification conditions, further combines the insulation impedance of the battery to perform insulation failure mode analysis, thereby improving the accuracy of failure analysis.

[0104] In some embodiments, 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, determining that a preset impedance condition is satisfied.

[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 it is detected that the preset identification condition is met, 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 met at this time, and the first mode insulation failure of the battery has occurred, that is, a single-point insulation failure has occurred.

[0106] It should be noted that 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 200MΩ (megaohms); in another embodiment, the first preset impedance threshold can also be set to be greater than 200MΩ or less than 200MΩ.

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

[0108] In some embodiments, 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, determining that a preset impedance condition is satisfied.

[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 it is detected that the preset identification condition is met, 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 met at this time, and the second mode insulation failure of the battery has occurred, that is, a multi-point insulation failure has occurred.

[0110] It should be noted that the second preset impedance threshold is not unique, and can be set to be consistent with the first preset impedance threshold, or different from the first preset impedance threshold, without specific limitation, as long as it can reasonably characterize the state of battery insulation abnormality. For example, in one embodiment, the second preset impedance threshold can be set to 200MΩ; in another embodiment, the second preset impedance threshold can also be set to be greater than 200MΩ or less than 200MΩ.

[0111] The above scheme verifies whether a battery has a multi-point insulation failure by analyzing whether the insulation impedance is less than a second preset impedance threshold, and has a high accuracy in multi-point insulation failure verification.

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

[0113] Step 602, when a single-point insulation failure occurs in the battery, obtain the single-cell voltage of each battery cell connected in series in the battery.

[0114] Step 604: Determine the battery cell where the single-point insulation failure occurs based on the cell voltage.

[0115] Specifically, in the solution of this embodiment, the battery is a battery of the type in which multiple battery cells are connected in series, wherein the battery cells connected in series can be the same or different. For example, the battery cells connected in series can all be single cells or single battery packs, or can be a parallel structure including both single cells and multiple cells.

[0116] In the event of a single-point insulation failure in a battery, the cell voltage of each battery cell can be obtained separately, and then combined with the cell voltage for analysis to ultimately find the abnormal cell voltage, thereby determining the battery cell where the single-point insulation failure has occurred, thus locating the single-point insulation failure.

[0117] It should be pointed out that, in one embodiment, if the battery cell with single-point insulation failure is located as a parallel structure of multiple battery cells or a battery pack, battery package, etc., after locating the battery cell with single-point insulation failure, other methods are needed to locate the specific failed battery cell.

[0118] For example, when the battery unit with single-point insulation failure is a battery group or battery pack, the battery group or battery pack can be regarded as the battery with insulation abnormality, and the battery cells connected in series inside it can be regarded as battery units, and the insulation failure type analysis and location can be carried out in a similar manner to the above; if the battery unit with single-point insulation failure is a battery cell parallel structure, it can be tested by disassembly and other methods, which are not limited here.

[0119] In the case of a single-point insulation failure, the above scheme can also combine the single-cell voltages of each battery cell to locate the battery cell where the single-point insulation failure occurs, thereby improving the reliability of insulation failure.

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

[0121] Step 702, sequentially summing up the cell voltages to obtain a cell voltage sum.

[0122] Step 704: Whenever the sum of the cell voltages is accumulated, the sum is subtracted from the total negative electrode to shell voltage.

[0123] Step 706: When the difference between the total negative electrode-to-shell voltage and the sum of the cell voltages is less than a first preset difference threshold, determine that a single-point insulation failure occurs in the battery cell corresponding to the currently accumulated cell voltage.

[0124] Specifically, the solution of this embodiment combines the total negative electrode to shell voltage with the single cell voltage sum to locate single point insulation failure. Specifically, a corresponding relationship between the single cell voltage and the battery cell can be established, and the single cell voltages of each battery cell can be accumulated in a certain order. Every time the single cell voltage sum is accumulated, it will be subtracted from the total negative electrode to shell voltage. It can be based on the total negative electrode to shell voltage minus the single cell voltage sum; it can also be based on the single cell voltage sum minus the total negative electrode to shell voltage, and then take the absolute value of the difference and compare it with the first preset difference threshold.

[0125] When the difference between the total negative electrode-to-shell voltage and the sum of the cell voltages is less than a first preset difference threshold, it is considered that a single-point insulation failure occurs in the cell corresponding to the currently accumulated cell voltage, thereby locating the single-point insulation failure.

[0126] It should be pointed out that, in one embodiment, the battery cells in the battery can be numbered in sequence from the total positive electrode to the total negative electrode. In the process of accumulation and difference analysis, the single cell voltages of each battery cell can be accumulated in sequence from the total positive electrode to the total negative electrode, or from the total negative electrode to the total positive electrode.

[0127] It is understandable that the first preset difference threshold is not unique, and may vary depending on the type of battery cell. In one embodiment, the first preset difference threshold may 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 between 2.5V and 3.65V, and accordingly, 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 between 2.7V and 4.2V, and accordingly, 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. Furthermore, considering that the more common cells are 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] The above scheme analyzes and determines the battery cell where single-point insulation failure occurs by subtracting the total negative electrode-to-shell voltage from the accumulated single cell voltage, and has a high insulation failure location accuracy.

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

[0131] Step 702, sequentially summing up the cell voltages to obtain a cell voltage sum.

[0132] Step 804: Whenever the sum of the cell voltages is accumulated, the sum is subtracted from the total positive electrode to shell voltage.

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

[0134] Specifically, similar to the above embodiment, this embodiment uses the total positive pole to locate the shell voltage for insulation failure. The specific implementation method is similar to the above positioning of the shell voltage through the total negative pole, which will not be repeated here.

[0135] The setting method of the second preset difference threshold is similar to the setting method of the first preset difference threshold, which will not be repeated here. The two can be set the same or differently, depending on actual needs.

[0136] The above scheme analyzes and determines the battery cell where single-point insulation failure occurs by subtracting the total positive electrode-to-shell voltage from the accumulated single cell voltage, and has a high insulation failure location efficiency.

[0137] In order to facilitate understanding of the technical solution of the present application, the present application is explained below in conjunction with more detailed embodiments.

[0138] During the operation of the vehicle, the vehicle system can monitor whether the battery (battery pack) has insulation abnormalities. This can be achieved through insulation impedance detection, infrared imaging detection, etc. When insulation abnormalities are detected, the battery's total voltage, total positive electrode-to-shell voltage, total negative electrode-to-shell voltage and insulation impedance can be obtained through the battery management system.

[0139] When the first mode insulation failure is a single-point insulation failure, the detection logic is:

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

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

[0142] When the first mode insulation failure is a multi-point insulation failure, the detection logic is:

[0143] The battery management system first determines whether condition 1 is met. At this time, condition 1 is: U 总 -(U 总正对壳 +U 总负对壳 )>4.2V; if condition 1 is met, determine whether condition 2 is met. At this time, condition 2 is: the duration of condition 1 reaches 5 seconds, or the insulation resistance is less than 200MΩ.

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

[0145] In the event of a single-point insulation failure, the battery management system combines the single cell voltages of each battery unit (cell) and numbers them in the order of total positive to total negative, or total negative to total positive. After that, it can be determined whether the condition U is met. 总负对壳 -(U1+U2+U3………UN)<2V UN number, determine that the battery cell corresponding to this number is the battery cell with insulation failure, and use this number to locate the specific failure point. Or the judgment condition U 总正对壳 -(U1+U2+U3………UN)<2V when the number of UN is used to determine that the battery cell corresponding to the number is the battery cell where insulation failure occurs, and the specific failure point can be located based on this number.

[0146] It should be understood that, although the various steps in the flowcharts involved in the above-mentioned embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-mentioned embodiments can include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0147] Based on the same inventive concept, the embodiment of the present application also provides a battery insulation failure analysis device for implementing the battery insulation failure analysis method involved above. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above method, so the specific limitations in one or more battery insulation failure analysis device embodiments provided below can refer to the limitations of the battery insulation failure analysis method above, and will not be repeated here.

[0148] Please refer to FIG. 9 . The present application further 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 obtain the total voltage, total positive electrode-to-shell voltage and total negative electrode-to-shell voltage of the battery when an insulation abnormality occurs in the battery; the voltage analysis module 904 is used to start timing with a preset time length when it is determined that a preset identification condition is met based on the total voltage, the total positive electrode-to-shell voltage and the total negative electrode-to-shell voltage; the first failure identification module 906 is used to determine that a first mode insulation failure occurs in the battery when the preset identification condition is maintained to be met within a preset time length; the second failure identification module 908 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 to be met within a preset time length; 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 also used to determine 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 the preset identification condition is met based on the total voltage and the sum of the voltage values, the timing starts at a preset time length.

[0151] In some embodiments, the voltage analysis module 904 is further configured to determine that a 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 a first preset multiple of the single cell voltage.

[0152] In some embodiments, the voltage analysis module 904 is further configured to determine that a preset identification condition is satisfied 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.

[0153] In some embodiments, the first failure identification module 906 is also used to obtain the insulation impedance of the battery; when the insulation impedance meets the preset impedance condition, it is determined that the battery has a first mode insulation failure; when the insulation impedance does not meet the preset impedance condition, it is determined that the battery has a second mode insulation failure.

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

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

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

[0157] The failure location module 1002 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; and determine the battery cell where the single-point insulation failure occurs according to the cell voltage.

[0158] In some embodiments, the failure location module 1002 is also used to accumulate the voltages of each cell in turn to obtain the sum of the cell voltages; each time the sum of the 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 cell voltages is less than a first preset difference threshold, it is determined that a single-point insulation failure has occurred in the battery cell corresponding to the currently accumulated cell voltage.

[0159] In some embodiments, the failure location module 1002 is also used to accumulate the voltages of each cell in turn to obtain the sum of the cell voltages; each time the sum of the 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 cell voltages is less than a second preset difference threshold, it is determined that a single-point insulation failure has occurred in the battery cell corresponding to the currently accumulated cell voltage.

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

[0161] The above-mentioned battery insulation failure analysis device can analyze the total voltage, total positive electrode to shell voltage and total negative electrode to shell voltage of the battery in the case of insulation withstand voltage failure of the battery. When the preset identification conditions are met, the timing starts at the preset time length. When the preset identification conditions are met within the preset time length, 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, 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. Through this solution, when the insulation abnormality of the battery occurs, the total voltage, total positive electrode to shell voltage and total negative electrode to shell voltage of the battery can be combined to automatically analyze and determine whether a single-point insulation failure or a multi-point insulation failure currently occurs, without disassembling the battery, and with high insulation failure troubleshooting efficiency.

[0162] The present application also provides a battery device, including a battery and a battery management system, the battery including a plurality of battery cells connected in series, each battery cell being respectively connected to the battery management system, and the battery management system being used to execute the steps of the above-mentioned battery insulation failure analysis method.

[0163] Specifically, the implementation of the battery insulation failure analysis method is as shown in the above embodiments, which will not be repeated here. The battery device can be a power battery or an energy storage battery, which is not specifically limited.

[0164] The above scheme can be combined with the total voltage, total positive electrode to shell voltage and total negative electrode to shell voltage of the battery for analysis when the battery has an insulation withstand voltage failure. When the preset identification conditions are met, the timing starts at the preset time length, and when the preset identification conditions are maintained within the preset time length, 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, 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. Through this scheme, when the battery has insulation abnormality, combined with the total voltage, total positive electrode to shell voltage and total negative electrode to shell voltage of the battery, it can be automatically analyzed to determine whether a single-point insulation failure or a multi-point insulation failure has occurred, without disassembling the battery, and has a high efficiency in troubleshooting insulation failures.

[0165] In some embodiments, the present application also provides a computer device, which may be a terminal, and its internal structure diagram may be shown in FIG11. The computer device includes a processor, a memory, an input / output interface, and a communication interface. The processor, the memory, and the input / output interface are connected via a system bus, and the communication interface is connected to the system bus via the input / output interface. 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 an external device. The communication interface of the computer device is used to communicate with an external terminal 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, a battery insulation failure analysis method is implemented.

[0166] Those skilled in the art will understand that the structure shown in FIG. 11 is merely a block diagram of a partial structure 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 shown in the figure, or combine certain components, or have a different arrangement of components.

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

[0168] In the event of an insulation abnormality in the battery, the total voltage, total positive electrode-to-shell voltage, and total negative electrode-to-shell voltage of the battery are obtained; when it is determined that the preset identification conditions are met based on the total voltage, the total positive electrode-to-shell voltage, and the total negative electrode-to-shell voltage, timing is started at a preset time length; when the preset identification conditions are maintained to be met within the preset time length, it is determined that the battery has a first mode insulation failure; when it is determined that the preset identification conditions are not met, or the preset identification conditions are not maintained to be met within the preset time length, it is determined 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: 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 the preset identification condition is met based on the total voltage and the sum of the voltage values, starting timing with a preset time length.

[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 a first preset multiple of the single cell voltage, it is determined that the preset identification condition is met.

[0171] 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 a second preset multiple of the single cell voltage, it is determined that a preset identification condition is met.

[0172] In one embodiment, when the processor executes the computer program, the following steps are also implemented: obtaining the insulation impedance of the battery; when the insulation impedance meets the preset impedance condition, determining that the battery has a first mode insulation failure; when the insulation impedance does not meet the preset impedance condition, determining 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 a first preset impedance threshold, determining that a 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 a second preset impedance threshold, determining that a preset impedance condition is satisfied.

[0175] In one embodiment, when the processor executes the computer program, the following steps are also implemented: when a single-point insulation failure occurs in the battery, the cell voltage of each battery cell connected in series in the battery is obtained; and the battery cell where the single-point insulation failure occurs is determined based on the cell voltage.

[0176] In one embodiment, the processor further implements the following steps when executing the computer program: accumulating the voltages of each cell in turn to obtain a sum of the cell voltages; subtracting the sum of the cell voltages from the total negative electrode-to-shell voltage each time the sum of the cell voltages is accumulated; and when the difference between the total negative electrode-to-shell voltage and the sum of the cell voltages is less than a first preset difference threshold, determining that a single-point insulation failure has occurred in the battery cell corresponding to the currently accumulated cell voltage.

[0177] In one embodiment, the processor further implements the following steps when executing the computer program: accumulating the voltages of each cell in turn to obtain a sum of the cell voltages; subtracting the sum of the cell voltages from the total positive electrode-to-shell voltage each time the sum of the cell voltages is accumulated; and when the difference between the total positive electrode-to-shell voltage and the sum of the cell voltages is less than a second preset difference threshold, determining that a single-point insulation failure has occurred in the battery cell corresponding to the currently accumulated cell voltage.

[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] In the event of an insulation abnormality in the battery, the total voltage, total positive electrode-to-shell voltage, and total negative electrode-to-shell voltage of the battery are obtained; when it is determined that the preset identification conditions are met based on the total voltage, the total positive electrode-to-shell voltage, and the total negative electrode-to-shell voltage, timing is started at a preset time length; when the preset identification conditions are maintained to be met within the preset time length, it is determined that the battery has a first mode insulation failure; when it is determined that the preset identification conditions are not met, or the preset identification conditions are not maintained to be met within the preset time length, it is determined 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 also implemented: 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 the preset identification condition is met based on the total voltage and the sum of the voltage values, starting timing with a preset time length.

[0181] In one embodiment, when the computer program is executed by the processor, 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 a first preset multiple of the single cell voltage, it is determined that the preset identification condition is met.

[0182] In one embodiment, when the computer program is executed by the processor, the following steps are also implemented: 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, determining that a preset identification condition is met.

[0183] In one embodiment, when the computer program is executed by the processor, the following steps are also implemented: obtaining the insulation impedance of the battery; when the insulation impedance meets the preset impedance condition, determining that the battery has a first mode insulation failure; when the insulation impedance does not meet the preset impedance condition, determining 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 a first preset impedance threshold, determining that a preset impedance condition is satisfied.

[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 a second preset impedance threshold, determining that a preset impedance condition is satisfied.

[0186] In one embodiment, when the computer program is executed by the processor, the following steps are also implemented: when a single-point insulation failure occurs in the battery, the cell voltage of each battery cell connected in series in the battery is obtained; and the battery cell where the single-point insulation failure occurs is determined based on the cell voltage.

[0187] In one embodiment, when the computer program is executed by the processor, the following steps are also implemented: accumulating the voltages of each cell in turn to obtain a sum of the cell voltages; each time the sum of the 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 cell voltages is less than a first preset difference threshold, determining that a single-point insulation failure has occurred in the battery cell corresponding to the currently accumulated cell voltage.

[0188] In one embodiment, when the computer program is executed by the processor, the following steps are also implemented: accumulating the voltages of each cell in turn to obtain a sum of the cell voltages; each time the sum of the 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 cell voltages is less than a second preset difference threshold, determining that a single-point insulation failure has occurred in the battery cell corresponding to the currently accumulated cell voltage.

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

[0190] In the event of an insulation abnormality in the battery, the total voltage, total positive electrode-to-shell voltage, and total negative electrode-to-shell voltage of the battery are obtained; when it is determined that the preset identification conditions are met based on the total voltage, the total positive electrode-to-shell voltage, and the total negative electrode-to-shell voltage, timing is started at a preset time length; when the preset identification conditions are maintained to be met within the preset time length, it is determined that the battery has a first mode insulation failure; when it is determined that the preset identification conditions are not met, or the preset identification conditions are not maintained to be met within the preset time length, it is determined that the battery has a second mode insulation failure.

[0191] In one embodiment, when the computer program is executed by the processor, the following steps are also implemented: 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 the preset identification condition is met based on the total voltage and the sum of the voltage values, starting timing with a preset time length.

[0192] In one embodiment, when the computer program is executed by the processor, 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 a first preset multiple of the single cell voltage, it is determined that the preset identification condition is met.

[0193] In one embodiment, when the computer program is executed by the processor, the following steps are also implemented: 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, determining that a preset identification condition is met.

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

[0195] 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 a first preset impedance threshold, determining that a preset impedance condition is satisfied.

[0196] 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 a second preset impedance threshold, determining that a preset impedance condition is satisfied.

[0197] In one embodiment, when the computer program is executed by the processor, the following steps are also implemented: when a single-point insulation failure occurs in the battery, the cell voltage of each battery cell connected in series in the battery is obtained; and the battery cell where the single-point insulation failure occurs is determined based on the cell voltage.

[0198] In one embodiment, when the computer program is executed by the processor, the following steps are also implemented: accumulating the voltages of each cell in turn to obtain a sum of the cell voltages; each time the sum of the 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 cell voltages is less than a first preset difference threshold, determining that a single-point insulation failure has occurred in the battery cell corresponding to the currently accumulated cell voltage.

[0199] In one embodiment, when the computer program is executed by the processor, the following steps are also implemented: accumulating the voltages of each cell in turn to obtain a sum of the cell voltages; each time the sum of the 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 cell voltages is less than a second preset difference threshold, determining that a single-point insulation failure has occurred in the battery cell corresponding to the currently accumulated cell voltage.

[0200] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and 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-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. 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 may be in various forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM).

[0201] The above-mentioned computer device, storage medium and computer program product can analyze the total voltage, total positive electrode to shell voltage and total negative electrode to shell voltage of the battery in the case of insulation withstand voltage failure of the battery. When the preset identification conditions are met, the timing starts at the preset time length, and when the preset identification conditions are maintained within the preset time length, 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, 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. Through this solution, when the insulation abnormality of the battery occurs, the total voltage, total positive electrode to shell voltage and total negative electrode to shell voltage of the battery can be combined to automatically analyze and determine whether a single-point insulation failure or a multi-point insulation failure currently occurs, without disassembling the battery, and with 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 aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall 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 for the preset time period, 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.

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: 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 a first preset multiple of a single cell voltage, it is determined that a preset identification condition is met; the single cell voltage is the voltage of a single battery cell in the battery.

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 a single cell voltage, it is determined that a preset identification condition is met; the single cell voltage is the voltage of a single battery cell in the battery.

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. The battery insulation failure analysis method according to any one of claims 1 to 7, characterized in that: The method further comprises: When a single-point insulation failure occurs in the battery, obtaining a single cell voltage of each battery cell connected in series in the battery; A battery cell where a single-point insulation failure occurs is determined according to the single-cell voltage.

9. The battery insulation failure analysis method according to claim 8, characterized in that: The step of determining the battery cell where the single-point insulation failure occurs according to the single cell voltage includes: Accumulating the voltages of the monomers in sequence to obtain a sum of the monomer voltages; Whenever the sum of the monomer voltages is accumulated, the sum 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 smaller than a first preset difference threshold, it is determined that a single-point insulation failure occurs in the battery cell corresponding to the currently accumulated single cell voltage.

10. The battery insulation failure analysis method according to claim 8, characterized in that: The step of determining the battery cell where the single-point insulation failure occurs according to the single cell voltage includes: Accumulating the voltages of the monomers in sequence to obtain a sum of the monomer voltages; Whenever the sum of the monomer voltages is accumulated, the sum 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 smaller than a second preset difference threshold, it is determined that a single-point insulation failure occurs in the battery cell corresponding to the currently accumulated single cell voltage.

11. 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 has occurred in the battery when it is determined that the preset identification condition is not met or the preset identification condition is not maintained for 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.

12. 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 10.

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

14. 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 10 are implemented.

15. 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 10 are implemented.

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