Battery internal short circuit detection method and device, terminal and computer readable storage medium

Abstract

The invention provides a battery internal short circuit detection method and device, a terminal and a computer readable storage medium. The battery internal short circuit detection method comprises the following steps: acquiring a corresponding voltage sequence when a to-be-detected battery cell is in a gun insertion charging stage; the voltage sequence comprises n pieces of voltage data sequentially collected according to a preset time interval; n is a positive integer greater than or equal to 2; based on the voltage sequence of the to-be-detected battery cell, determining an internal short circuit evaluation value of the to-be-detected battery cell; the internal short circuit evaluation value is the internal short circuit degree of the to-be-detected battery cell; and based on the internal short circuit evaluation value of each to-be-detected battery cell, determining the to-be-detected battery cell with the internal short circuit in the battery. The internal short circuit evaluation value of the to-be-detected battery cell is determined according to the plurality of voltage data of the to-be-detected battery cell in the gun insertion charging stage, and the reliability of the internal short circuit evaluation value of the to-be-detected battery cell is improved; and the to-be-detected battery cells in the batteries are screened based on the internal short circuit evaluation values of the to-be-detected battery cells, so that the detection accuracy of the to-be-detected battery cells with internal short circuits in the batteries is improved.

Description

Technical Field

[0001] The present invention relates to the field of battery technology, and in particular to a method, device, electronic terminal and computer-readable storage medium for detecting short circuits in batteries. Background Art

[0002] Internal short circuit of battery cells will affect the storage and use of battery cells. For example, self-discharge caused by internal short circuit will cause failure of battery cells such as low voltage and zero voltage during storage. Internal short circuit may cause poor self-discharge consistency of a batch of battery cells in the battery pack, leading to safety problems such as overcharging and over-discharging, ultimately reducing the life of the battery module or causing safety problems.

[0003] The traditional method of detecting short circuits in batteries uses the rate of voltage drop and the rate of temperature rise of the battery to detect short circuits. Since the voltage may change dramatically with the fluctuation of working conditions, and the temperature acquisition will be affected by the layout of the temperature sensor, the accuracy of the detection results of the traditional method of detecting short circuits in batteries cannot be guaranteed. Summary of the invention

[0004] The main technical problem solved by the present invention is to provide a battery internal short circuit detection method, device, terminal and computer-readable storage medium, which can improve the accuracy of internal short circuit detection.

[0005] In a first aspect, the present application provides a method for detecting a short circuit in a battery. The battery includes at least two cells to be detected. The method for detecting a short circuit in a battery includes: Obtain a voltage sequence corresponding to the battery cell to be tested when it is in the plug-in charging stage; the voltage sequence includes n voltage data collected in sequence according to a preset time interval; n is a positive integer greater than or equal to 2; Based on the voltage sequence of the battery cell to be tested, determining the internal short circuit evaluation value of the battery cell to be tested; the internal short circuit evaluation value is the degree of the internal short circuit of the battery cell to be tested; Based on the internal short circuit evaluation value of each battery cell to be detected, the battery cell to be detected having an internal short circuit in the battery is determined.

[0006] In the technical solution of the embodiment of the present application, the internal short circuit evaluation value of the battery cell to be detected is determined by using multiple voltage data of the battery cell to be detected during the plug-in charging stage, thereby improving the reliability of the internal short circuit evaluation value of the battery cell to be detected; and then the battery cells to be detected in the battery are screened based on the internal short circuit evaluation value of the battery cell to be detected, thereby improving the detection accuracy of the battery cells to be detected with internal short circuits in the battery.

[0007] In some embodiments, determining the internal short circuit evaluation value of the battery cell to be detected based on the voltage sequence of the battery cell to be detected includes: Based on the voltage sequence of the battery cell to be detected, determine m lowest voltage frequencies corresponding to the battery cell to be detected; m is a positive integer less than or equal to n; Based on the m lowest voltage frequencies corresponding to the battery cell to be detected, an internal short circuit evaluation value of the battery cell to be detected is determined.

[0008] In the technical solution of the embodiment of the present application, the minimum voltage frequency of the battery cell to be detected is determined through multiple voltage data of the battery cell to be detected during the plug-in charging stage, and the internal short circuit evaluation value is determined based on the minimum voltage frequency of the battery cell to be detected, thereby improving the accuracy of the internal short circuit evaluation value of the battery cell to be detected.

[0009] In some embodiments, based on the voltage sequence of the battery cell to be detected, determining m lowest voltage frequencies corresponding to the battery cell to be detected includes: Traverse each collection moment during the gun charging stage; Compare the voltage data of all cells to be tested in the battery at the same collection time, and determine the updated value of each cell to be tested at each collection time; the updated value is 0 and / or 1; Based on the updated value of the battery cell to be detected at each acquisition moment, m lowest voltage frequencies corresponding to the battery cell to be detected are determined.

[0010] In the technical solution of the embodiment of the present application, the lowest voltage frequency of the battery cell to be tested is determined by comparing the voltage data of multiple battery cells to be tested in the battery at the same time, so as to improve the accuracy of the short-circuit evaluation value of the battery cell to be tested; and further improve the accuracy of short-circuit detection in the battery.

[0011] In some embodiments, the voltage data of all cells to be detected in the battery at the same collection time are compared to determine the updated value of each cell to be detected at each collection time, including: Select the voltage data with the smallest value among the voltage data of all the cells to be tested corresponding to the collection time as the minimum voltage at the collection time; In response to the voltage data of the battery cell to be detected at the collection time being equal to the minimum voltage at the collection time, determining that the update value of the battery cell to be detected at the collection time is 0; In response to the voltage data of the battery cell to be detected at the collection time being greater than the minimum voltage at the collection time, it is determined that the update value of the battery cell to be detected at the collection time is 1.

[0012] In the technical solution of the embodiment of the present application, by comparing the voltage data of each battery cell to be tested in the battery with the minimum voltage at the corresponding collection moment, it is determined whether the voltage data of the battery cell to be tested at the current moment is the minimum voltage, thereby facilitating the determination of the minimum voltage frequency of the battery cell to be tested, so as to improve the accuracy of the short-circuit evaluation value of the battery cell to be tested.

[0013] In some embodiments, the n voltage data in the voltage sequence are arranged in ascending order or descending order according to the acquisition time; Based on the updated value of the battery cell to be detected at each acquisition time, m minimum voltage frequencies corresponding to the battery cell to be detected are determined, including: Slide sequentially from the first voltage data to the last voltage data in the voltage sequence using a preset range; the preset range refers to the number of sequentially adjacent acquisition moments; Based on the updated values ​​at each acquisition moment within the preset range, the lowest voltage frequency corresponding to the current sliding is determined.

[0014] In the technical solution of the embodiment of the present application, the minimum voltage frequency corresponding to the current sliding is determined by the updated value at each collection moment within a preset range, thereby improving the accuracy of the minimum voltage frequency sequence, so as to improve the accuracy of the short-circuit evaluation value of the battery cell to be detected.

[0015] In some embodiments, determining the internal short circuit evaluation value of the battery cell to be detected based on the m lowest voltage frequencies corresponding to the battery cell to be detected includes: Based on the difference between the lowest voltage frequency of the mth sliding corresponding to the battery cell to be detected, the lowest voltage frequency of the first sliding, and the total number of acquisition moments in the plug-in charging stage, the internal short circuit evaluation value of the battery cell to be detected is determined.

[0016] In the technical solution of the embodiment of the present application, the internal short circuit evaluation value of the battery cell to be detected is determined by the lowest voltage frequency of the last sliding, the lowest voltage frequency of the first sliding, and the total number of sampling moments in the plug-in charging stage, thereby improving the accuracy of the internal short circuit evaluation value of the battery cell to be detected.

[0017] In some embodiments, based on the internal short circuit evaluation value of each battery cell to be detected, determining the battery cell to be detected having an internal short circuit in the battery includes: Sorting the internal short circuit evaluation values ​​of all cells to be tested in the battery according to their numerical values ​​to generate an internal short circuit evaluation value sequence; Determine the upper quartile and lower quartile corresponding to the internal short circuit evaluation value sequence; According to the upper quartile and the lower quartile, determine the interquartile range corresponding to the internal short circuit evaluation value sequence; Determine the threshold range based on the interquartile range, upper quartile and lower quartile corresponding to the internal short circuit evaluation value sequence; Each internal short circuit evaluation value is compared with the threshold range to determine whether the battery cell to be tested corresponding to the internal short circuit evaluation value has an internal short circuit.

[0018] In the technical solution of the embodiment of the present application, the upper quartile, the lower quartile and the threshold range are determined by the internal short circuit evaluation value of each battery cell to be tested in the battery, and the battery cells to be tested are screened based on the threshold range to improve the accuracy of the screening results.

[0019] In some embodiments, obtaining a voltage sequence corresponding to a battery cell to be detected in a plug-in charging stage includes: Acquire multiple voltage data collected sequentially at preset time intervals during the plug-in charging stage of the battery cell to be tested; Based on the voltage data at the time of collection, determining the remaining power at the time of collection; The voltage data of the remaining power in the preset power range is extracted and sorted according to the collection time to generate a voltage sequence; the preset power range is [A, B], where the value range of A is [5%, 35%]; the value range of B is [65%, 100%].

[0020] In the technical solution of the embodiment of the present application, the voltage data in the plug-in charging stage is screened based on the remaining power, which reduces the workload and improves the detection efficiency.

[0021] In some embodiments, the value range of A is [10%, 30%]; the value range of B is [70%, 100%].

[0022] In the technical solution of the embodiment of the present application, by screening the voltage data corresponding to the remaining power in the preset power range, the detection efficiency can be improved and the reliability of the detection result can be guaranteed.

[0023] In a second aspect, the present application provides a method for detecting a short circuit in a battery, comprising: Obtaining internal short circuit evaluation value sequences corresponding to at least two batteries to be detected, respectively, the internal short circuit evaluation value sequences being internal short circuit evaluation values ​​of each battery cell in the batteries to be detected, the internal short circuit evaluation values ​​of the battery cells being obtained according to the battery internal short circuit detection method of the first aspect above; Based on the internal short circuit evaluation value sequence of the battery to be detected, the battery to be detected having an internal short circuit is determined.

[0024] In the technical solution of the embodiment of the present application, the internal short circuit evaluation values ​​of the cells contained in each battery to be detected are analyzed respectively to determine the battery to be detected with an internal short circuit, thereby improving the detection accuracy of the battery to be detected.

[0025] In some embodiments, based on the internal short circuit evaluation value sequence of the battery to be detected, determining that the battery to be detected has an internal short circuit includes: Determining the internal short circuit degree value of the battery to be tested based on the internal short circuit evaluation value sequence of the battery to be tested; Based on the internal short circuit degree value of each battery to be detected, the battery to be detected with internal short circuit is determined.

[0026] In the technical solution of the embodiment of the present application, the internal short circuit degree value of the battery to be tested is determined by the internal short circuit evaluation value of each battery cell contained in the battery to be tested, which facilitates the screening of batteries with internal short circuits based on the internal short circuit degree value of the battery to be tested, thereby improving the screening accuracy.

[0027] In some embodiments, determining the internal short circuit degree value of the battery to be detected based on the internal short circuit evaluation value sequence of the battery to be detected includes: Subtract each internal short circuit evaluation value corresponding to the battery to be tested from the threshold value to obtain a difference value corresponding to each internal short circuit evaluation value; The internal short circuit evaluation value corresponding to the difference with the largest numerical value is selected as the internal short circuit degree value of the battery to be tested.

[0028] In the technical solution of the embodiment of the present application, the detection accuracy of the battery to be detected is improved by using the internal short circuit evaluation value of the battery cell that is most likely to have an internal short circuit in the battery to be detected as the internal short circuit degree value of the battery to be detected.

[0029] In some embodiments, based on the internal short circuit degree value of each battery to be detected, determining the battery to be detected that has an internal short circuit includes: Compare the internal short circuit degree value of the battery to be tested with the set range; In response to the internal short circuit degree value of the battery to be detected not being within the set range, it is determined that the battery to be detected has an internal short circuit.

[0030] In the technical solution of the embodiment of the present application, by comparing the internal short circuit degree value of the battery to be detected with a set range, the batteries to be detected with internal short circuits are screened to improve the detection accuracy.

[0031] In a third aspect, the present application provides a battery internal short circuit detection device, the battery comprising at least two cells to be detected, the battery internal short circuit detection device comprising: The sampling module is used to obtain the voltage sequence corresponding to the battery cell to be tested when it is in the plug-in charging stage; the voltage sequence includes n voltage data collected in sequence according to a preset time interval; n is a positive integer greater than or equal to 2; The processing module is used to determine the internal short circuit evaluation value of the battery cell to be detected based on the voltage sequence of the battery cell to be detected; the internal short circuit evaluation value is the internal short circuit degree of the battery cell to be detected; based on the internal short circuit evaluation value of each battery cell to be detected, determine the battery cell to be detected with internal short circuit in the battery.

[0032] In a fourth aspect, the present application provides a battery internal short circuit detection device, comprising: an acquisition module, used to acquire internal short circuit evaluation value sequences corresponding to at least two batteries to be detected, respectively, the internal short circuit evaluation value sequences being internal short circuit evaluation values ​​of each battery cell in the batteries to be detected, the internal short circuit evaluation values ​​of the battery cells being obtained according to the battery internal short circuit detection method of the first aspect; The detection module is used to determine the battery to be detected that has an internal short circuit based on the internal short circuit evaluation value sequence of the battery to be detected.

[0033] In a fifth aspect, the present application provides an electronic terminal, which includes a memory, a processor, and a computer program stored in the memory and running on the processor, and the processor is used to execute program data to implement the steps of the battery short circuit detection method as described in the first and second aspects above.

[0034] In a sixth aspect, the present application provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the steps in the battery internal short circuit detection method of the first and second aspects described above are implemented.

[0035] It can be understood that the beneficial effects of the third to sixth aspects mentioned above can be found in the relevant descriptions of the first and second aspects mentioned above, and will not be repeated here.

[0036] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0038] Figure 1 It is a flow chart of an embodiment of a method for detecting short circuit in a battery provided by the present application; Figure 2 yes Figure 1 A flowchart of a specific embodiment of step S11 in the provided battery internal short circuit detection method; Figure 3 yes Figure 1 A flowchart of a specific embodiment of step S12 in a method for detecting short circuit in a battery is provided; Figure 4 yes Figure 3A schematic diagram of a preset range in step S123 of a battery internal short circuit detection method provided; Figure 5 It is a flow chart of another embodiment of the battery internal short circuit detection method provided by the present application; Figure 6 yes Figure 5 A flowchart of a specific embodiment of step S22 in a battery internal short circuit detection method is provided; Figure 7 It is a schematic diagram of the framework of an embodiment of a battery internal short circuit detection device provided by the present application; Figure 8 It is a schematic diagram of the framework of another embodiment of the battery internal short circuit detection device provided by the present application; Fig. 9 It is a schematic diagram of the framework of an embodiment of an electronic terminal provided by the present application; Fig.10 It is a schematic diagram of a framework of an embodiment of a computer-readable storage medium provided by the present application. DETAILED DESCRIPTION

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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).

[0045] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0046] 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.

[0047] Internal short circuit is one of the most common causes of lithium battery safety runaway accidents. Under conditions of abuse such as external force, electricity, and heat, as well as quality defects in the battery manufacturing process and the mixing of foreign matter, the positive and negative electrodes of the lithium battery may be short-circuited, triggering an internal short circuit. The heat generated by the internal short circuit causes the local temperature of the battery to rise, which in turn causes a larger-scale internal short circuit. The heat continues to accumulate, eventually triggering a chain reaction of thermal runaway, leading to safety accidents such as fire and explosion. Therefore, it is particularly important to evaluate the battery performance before the battery is put into use, or to detect the internal short circuit of the battery during use.

[0048] The traditional battery internal short circuit detection method uses the battery voltage drop rate and temperature rise rate to perform internal short circuit detection. As the working conditions fluctuate, the voltage may change dramatically, and the temperature acquisition will be affected by the layout of the temperature sensor, so the accuracy of the detection results of the traditional battery internal short circuit detection method cannot be guaranteed.

[0049] The battery internal short circuit detection method provided by the present application includes: obtaining the voltage sequence corresponding to the battery cell to be detected when it is in the plug-in charging stage; the voltage sequence includes n voltage data collected in sequence according to a preset time interval; n is a positive integer greater than or equal to 2; based on the voltage sequence of the battery cell to be detected, determining the internal short circuit evaluation value of the battery cell to be detected; the internal short circuit evaluation value is the internal short circuit degree of the battery cell to be detected; based on the internal short circuit evaluation value of each battery cell to be detected, determining the battery cell to be detected with internal short circuit in the battery. The battery cell with internal short circuit in the battery is screened out based on the voltage difference between each battery cell in the battery, thereby improving the accuracy of the battery internal short circuit detection.

[0050] The battery type to which the battery internal short circuit detection method provided in the present application is applicable is not limited. It should be noted that the battery internal short circuit detection method proposed in the present application can be applied to the lithium battery detection scenario of new energy vehicles.

[0051] See also Figure 1 , Figure 1 It is a flow chart of an embodiment of a method for detecting short circuit in a battery provided in the present application.

[0052] The present application provides a method for detecting short circuits in a battery. The execution subject of the method for detecting short circuits in a battery provided in this embodiment can be a battery management system on a vehicle, or a server or a cloud. The battery management system (BMS) is a key component to ensure the safe and efficient operation of the battery pack. The battery management system is an important link between the vehicle-mounted power battery and the electric vehicle. The battery includes at least two cells to be detected. The method for detecting short circuits in a battery includes the following steps.

[0053] S11: Obtain a voltage sequence corresponding to the battery cell to be tested when it is in the plug-in charging stage; the voltage sequence includes n voltage data collected in sequence according to a preset time interval; n is a positive integer greater than or equal to 2.

[0054] S12: Determine an internal short circuit evaluation value of the battery cell to be detected based on the voltage sequence of the battery cell to be detected; the internal short circuit evaluation value is the degree of internal short circuit of the battery cell to be detected.

[0055] S13: Based on the internal short circuit evaluation value of each battery cell to be detected, determine the battery cell to be detected that has an internal short circuit in the battery.

[0056] In the technical solution of the embodiment of the present application, the internal short circuit evaluation value of the battery cell to be detected is determined by using multiple voltage data of the battery cell to be detected during the plug-in charging stage, thereby improving the reliability of the internal short circuit evaluation value of the battery cell to be detected; and then the battery cells to be detected in the battery are screened based on the internal short circuit evaluation value of the battery cell to be detected, thereby improving the detection accuracy of the battery cells to be detected with internal short circuits in the battery.

[0057] See also Figure 2 , Figure 2 yes Figure 1 A flowchart of a specific embodiment of step S11 in a method for detecting short circuit in a battery is provided.

[0058] In one embodiment, a specific implementation method of obtaining a voltage sequence corresponding to when the battery cell to be detected is in the plug-in charging stage in step S11 is as follows.

[0059] S111: Acquire a plurality of voltage data collected sequentially at preset time intervals when the battery cell to be tested is in the plug-in charging stage.

[0060] In one embodiment, the voltage data of each battery cell to be detected in the battery is collected at preset time intervals by the BMS system of the vehicle. Each voltage data has corresponding operating condition information. Among them, the operating condition information includes a charging stage and a discharging stage. The voltage data of the battery cell to be detected is screened based on the operating condition information of the voltage data. If the battery cell to be detected has an internal short circuit, the voltage data of the battery cell to be detected during the charging stage changes more obviously. Therefore, in order to improve the detection accuracy of the internal short circuit of the battery cell, the operating condition information is extracted as multiple voltage data of the charging stage, and the voltage data is analyzed to determine whether the battery cell to be detected has an internal short circuit. By improving the reliability of the voltage data, the accuracy of the internal short circuit detection of the battery cell is improved.

[0061] In one embodiment, in order to further improve the reliability of voltage data, the electrical parameters of each battery cell to be detected can be preprocessed to eliminate abnormal electrical parameters. Electrical parameters include remaining power data and voltage data. A large number of abnormal electrical parameters may seriously affect the detection results. Preprocessing may include data cleaning and data conversion. Data cleaning includes removing duplicate data, eliminating abnormal values, removing null values ​​and invalid values. Removing invalid values ​​involves identifying and processing data that does not conform to the expected range or format. The method for removing duplicate data includes identifying duplicate records in the data and deleting them. Duplicate data generally refers to multiple values ​​recorded at the same acquisition time. The method for removing null values ​​is as follows: directly delete the rows containing null values. Data conversion refers to converting the units of electrical parameters of the same attribute to the same preset unit, so as to compare each battery cell to be detected in the battery under the same unit and improve the detection accuracy.

[0062] By performing data cleaning on the electrical parameters collected during the charging stage of the battery cell to be tested, the collected abnormal electrical parameters can be eliminated, and the reliability of the test data can be improved, so as to improve the accuracy of internal short circuit detection of the battery cell in the battery.

[0063] S112: Determine the remaining power at the time of collection based on the voltage data at the time of collection.

[0064] In one embodiment, each battery cell to be tested has a corresponding voltage-state of charge (SOC) curve, which is a curve describing the relationship between the voltage and discharge capacity of the battery. Based on the voltage data of the battery cell to be tested at each acquisition time, the remaining power corresponding to each voltage data is determined in the corresponding voltage-state of charge curve.

[0065] S113: extracting voltage data of the remaining power in a preset power range and sorting them according to the collection time to generate a voltage sequence.

[0066] Specifically, the preset power interval is [A, B], where the value range of A is [5%, 35%]; the value range of B is [65%, 100%].

[0067] In the technical solution of the embodiment of the present application, the voltage data in the plug-in charging stage is screened based on the remaining power, which reduces the workload and improves the detection efficiency.

[0068] In one embodiment, the value range of A is [10%, 30%]; the value range of B is [70%, 100%]. For example, the value of A can be 15%, 20%, 17% or 25%; the value of B can be 75%, 80%, 85%, 90% or 95%.

[0069] In some embodiments, the retained voltage data is arranged in ascending order according to the collection time to generate a voltage sequence of the battery cell to be tested. The time difference between the collection times of adjacent voltage data in the voltage sequence meets the preset time difference. The preset time difference can be 5 minutes, 10 minutes, etc.

[0070] In the technical solution of the embodiment of the present application, by screening the voltage data corresponding to the remaining power in the preset power range, the detection efficiency can be improved and the reliability of the detection result can be guaranteed.

[0071] Through the above steps, the voltage sequence corresponding to each battery cell to be detected in the plug-in charging stage can be obtained, which improves the reliability of data and facilitates improving the detection accuracy.

[0072] In one embodiment, a specific implementation of determining the internal short circuit evaluation value of the battery cell to be detected based on the voltage sequence of the battery cell to be detected in step S12 is as follows.

[0073] Specifically, based on the voltage sequence of the battery cell to be detected, m lowest voltage frequencies corresponding to the battery cell to be detected are determined; m is a positive integer less than or equal to n. Based on the m lowest voltage frequencies corresponding to the battery cell to be detected, an internal short circuit evaluation value of the battery cell to be detected is determined.

[0074] In the technical solution of this embodiment, the minimum voltage frequency of the battery cell to be detected is determined through multiple voltage data of the battery cell to be detected during the plug-in charging stage, and the internal short circuit evaluation value is determined based on the minimum voltage frequency of the battery cell to be detected, thereby improving the accuracy of the internal short circuit evaluation value of the battery cell to be detected.

[0075] See also Figure 3 , Figure 3 yes Figure 1 A flowchart of a specific embodiment of step S12 in a method for detecting short circuit in a battery is provided.

[0076] In a specific embodiment, based on the voltage sequence of the battery cell to be detected, the step of determining m lowest voltage frequencies corresponding to the battery cell to be detected specifically includes the following specific implementation methods.

[0077] S121: Traverse each collection moment in the gun charging stage.

[0078] S122: Compare the voltage data of all the cells to be detected in the battery at the same collection time, and determine the update value of each cell to be detected at each collection time; the update value is 0 and / or 1.

[0079] In one embodiment, the voltage data with the smallest value among the voltage data of all the cells to be detected corresponding to the collection time is selected as the minimum voltage at the collection time. In response to the voltage data of the cell to be detected at the collection time being equal to the minimum voltage at the collection time, the update value of the cell to be detected at the collection time is determined to be 0. In response to the voltage data of the cell to be detected at the collection time being greater than the minimum voltage at the collection time, the update value of the cell to be detected at the collection time is determined to be 1.

[0080] In the technical solution of the embodiment of the present application, by comparing the voltage data of each battery cell to be tested in the battery with the minimum voltage at the corresponding collection moment, it is determined whether the voltage data of the battery cell to be tested at the current moment is the minimum voltage, thereby facilitating the determination of the minimum voltage frequency of the battery cell to be tested, so as to improve the accuracy of the short-circuit evaluation value of the battery cell to be tested.

[0081] S123: Determine m lowest voltage frequencies corresponding to the battery cells to be detected based on the updated values ​​of the battery cells to be detected at each collection moment.

[0082] In one embodiment, a preset range is used to slide in sequence from the first voltage data in the voltage sequence to the last voltage data; the preset range refers to the number of consecutively adjacent acquisition moments; based on the updated value of each acquisition moment within the preset range, the lowest voltage frequency corresponding to the current slide is determined. Specifically, the preset range includes adding and averaging the first value or the second value corresponding to the acquisition moment included in the window to improve the accuracy of the short circuit characteristic parameter, so as to improve the accuracy of the short circuit detection in the battery. The number of acquisition moments includes but is not limited to 5, 3, 7, etc.

[0083] In the technical solution of the embodiment of the present application, the minimum voltage frequency corresponding to the current sliding is determined by the updated value at each collection moment within a preset range, thereby improving the accuracy of the minimum voltage frequency sequence, so as to improve the accuracy of the short-circuit evaluation value of the battery cell to be detected.

[0084] In one embodiment, the update values ​​corresponding to each collection moment within the preset range may be summed and averaged, and the average value may be used as the minimum voltage frequency corresponding to the current sliding.

[0085] See also Figure 4 , Figure 4 yes Figure 3 A schematic diagram of the preset range in step S123 of the battery internal short circuit detection method is provided.

[0086] In a specific embodiment, the preset range can be 5 consecutive collection moments. For example, the update values ​​of the battery cell to be detected at each collection moment are 0, 0, 0, 1, 1, 1, ..., and the minimum voltage frequency corresponding to the first slide is (0+0+0+1+1) / 5=0.4; the minimum voltage frequency corresponding to the second slide is (0+0+1+1+1) / 5=0.6. According to the above embodiment, the preset range is sequentially slid from the updated value of the first collection moment corresponding to the voltage sequence to the updated value of the last collection moment, and the number of collection moments that can be slid backward each time includes but is not limited to 1, 2, etc., so as to determine the minimum voltage frequency corresponding to each slide.

[0087] In the technical solution of the embodiment of the present application, the lowest voltage frequency of the battery cell to be tested is determined by comparing the voltage data of multiple battery cells to be tested in the battery at the same time, so as to improve the accuracy of the short-circuit evaluation value of the battery cell to be tested; and further improve the accuracy of short-circuit detection in the battery.

[0088] In a specific embodiment, the step of determining the internal short circuit evaluation value of the battery cell to be detected based on the m lowest voltage frequencies corresponding to the battery cell to be detected specifically includes the following implementation methods.

[0089] Among them, the n voltage data in the voltage sequence are arranged in ascending or descending order according to the collection time. Based on the difference between the lowest voltage frequency of the mth sliding corresponding to the battery to be tested, the lowest voltage frequency of the first sliding, and the total number of collection times in the plug-in charging stage, the internal short circuit evaluation value of the battery to be tested is determined. Among them, the mth sliding is the last sliding. The total number of collection times is also the total number of voltage data in the voltage sequence. The total number of voltage data in the voltage sequence is the same as the total number of collection times.

[0090] In a specific embodiment, the ratio between the difference between the lowest voltage frequency of the mth sliding and the lowest voltage frequency of the first sliding corresponding to the battery cell to be detected and the total number of voltage data in the voltage sequence corresponding to the plug-in charging stage is used as the internal short circuit evaluation value of the battery cell to be detected.

[0091] Specifically, the internal short circuit evaluation value of the battery cell to be tested is calculated based on the following formula.

[0092] (Formula 1) Where: h 1 Indicates the internal short circuit evaluation value of the first battery cell to be tested; low rate1，n Indicates the lowest voltage frequency of the last sliding corresponding to the first battery cell to be tested; low rate1，1 Indicates the first lowest voltage frequency corresponding to the first battery cell to be tested; N indicates the total number of sampling moments in the plug-in charging stage.

[0093] In the technical solution of the embodiment of the present application, the internal short circuit evaluation value of the battery cell to be detected is determined by the lowest voltage frequency of the last sliding, the lowest voltage frequency of the first sliding, and the total number of sampling moments in the plug-in charging stage, thereby improving the accuracy of the internal short circuit evaluation value of the battery cell to be detected.

[0094] Through the above steps, the internal short circuit evaluation value of each battery cell to be tested in the battery can be obtained.

[0095] Specifically, in step S13, based on the internal short circuit evaluation value of each battery cell to be detected, a specific implementation method of determining the battery cell to be detected having an internal short circuit in the battery is as follows.

[0096] In one embodiment, an evaluation value range is preset, and the internal short circuit evaluation value of each battery to be tested is compared with the evaluation value range. In response to the internal short circuit evaluation value of the battery cell to be tested not being within the evaluation value range, it is determined that the battery cell to be tested has an internal short circuit.

[0097] In one embodiment, the internal short circuit evaluation values ​​of all the battery cells to be tested in the battery are sorted according to the numerical values ​​to generate an internal short circuit evaluation value sequence; the upper quartile and the lower quartile in the internal short circuit evaluation value sequence are determined; based on the upper quartile and the lower quartile, the interquartile range corresponding to the internal short circuit evaluation value sequence is determined; based on the interquartile range, the upper quartile and the lower quartile corresponding to the internal short circuit evaluation value sequence, the threshold range is determined; each internal short circuit evaluation value is compared with the threshold range to determine whether the battery cell to be tested corresponding to the internal short circuit evaluation value has an internal short circuit.

[0098] In a specific embodiment, the interquartile range method can be used to detect the internal short circuit evaluation value of each battery cell to be detected in the battery to determine whether each battery cell to be detected has an internal short circuit. Interquartile Range (IQR) is a statistical method used to measure the range of the middle 50% of the data distribution. It is expressed by calculating the difference between the upper quartile (Q3) and the lower quartile (Q1) of the data set. IQR is often used for outlier detection because it is sensitive to fluctuations in the middle of the data set and has little impact on extreme values. IQR calculation method: IQR = Q3-Q1; where Q1 is the 25th percentile (lower quartile) and Q3 is the 75th percentile (upper quartile). Through IQR, it can be determined whether a data point is an outlier. Generally, the rule for defining a data point as an outlier is: if it is lower than Q1-1.5×IQR or higher than Q3+1.5×IQR, it is considered an outlier.

[0099] For example, the short circuit evaluation values ​​of all the cells to be tested in the battery are arranged in ascending or descending order according to the numerical values, and the upper quartile (Q3) and the lower quartile (Q1) are obtained from the sorting. The IQR is calculated based on the upper quartile (Q3) and the lower quartile (Q1). The threshold range is determined based on the upper quartile (Q3), the lower quartile (Q1) and the preset value. The preset value may be 1.5 or other values. The threshold range is [Q1-1.5×IQR, Q3+1.5×IQR]. It is determined whether the short circuit evaluation value of each cell to be tested in the battery is within the threshold range. If the short circuit evaluation value of the cell to be tested is within the threshold range, it is determined that the cell to be tested is normal; if the short circuit evaluation value of the cell to be tested is outside the threshold range, it is determined that the cell to be tested is an abnormal cell, and the cell to be tested has an internal short circuit.

[0100] In the technical solution of the embodiment of the present application, the upper quartile, the lower quartile and the threshold range are determined by the internal short circuit evaluation value of each battery cell to be tested in the battery, and the battery cells to be tested are screened based on the threshold range to improve the accuracy of the screening results.

[0101] See also Figure 5 , Figure 5 It is a flow chart of another embodiment of the battery internal short circuit detection method provided in the present application.

[0102] The present embodiment provides a method for detecting short circuits in a battery. The execution subject of the method for detecting short circuits in a battery provided by the present embodiment is a server or a cloud. The method for detecting short circuits in a battery includes the following steps.

[0103] S21: Obtaining internal short circuit evaluation value sequences corresponding to at least two batteries to be detected, respectively, where the internal short circuit evaluation value sequences are internal short circuit evaluation values ​​of each cell in the battery to be detected.

[0104] S22: Based on the internal short circuit evaluation value sequence of the battery to be detected, determine the battery to be detected that has an internal short circuit.

[0105] In the technical solution of the embodiment of the present application, the internal short circuit evaluation values ​​of the cells contained in each battery to be detected are analyzed respectively to determine the battery to be detected with an internal short circuit, thereby improving the detection accuracy of the battery to be detected.

[0106] Specifically, in step S21, based on the internal short circuit evaluation value of each battery cell to be detected, a specific implementation method of determining the battery cell to be detected having an internal short circuit in the battery is as follows.

[0107] In one embodiment, the battery to be tested includes at least two battery cells, and the method for determining the internal short circuit evaluation value of each battery cell is the method for determining the internal short circuit evaluation value of the battery cell to be tested in the above embodiment, which will not be repeated here.

[0108] The internal short circuit evaluation value of each cell in the battery to be detected is obtained by the method for determining the internal short circuit evaluation value of the battery to be detected in the above embodiment. The internal short circuit evaluation value sequence of the battery to be detected is composed based on the internal short circuit evaluation values ​​of all cells contained in the battery to be detected.

[0109] See also Figure 6 , Figure 6 yes Figure 5 A flowchart of a specific embodiment of step S22 in a method for detecting short circuit in a battery is provided.

[0110] Specifically, the specific implementation of determining the battery to be detected with an internal short circuit based on the internal short circuit evaluation value sequence of the battery to be detected in step S22 is as follows.

[0111] S221: Determine the internal short circuit degree value of the battery to be detected based on the internal short circuit evaluation value sequence of the battery to be detected.

[0112] In a specific embodiment, in order to improve the accuracy of the detection result, each internal short circuit evaluation value corresponding to the battery to be detected is subtracted from the threshold value to obtain the difference value corresponding to each internal short circuit evaluation value; the internal short circuit evaluation value corresponding to the difference value with the largest value is selected as the internal short circuit degree value of the battery to be detected. That is, the deviation between the internal short circuit degree value of the battery to be detected and the threshold value is the largest.

[0113] In the technical solution of the embodiment of the present application, by using the internal short circuit evaluation value of the battery cell most likely to have an internal short circuit in the battery to be detected as the internal short circuit degree value of the battery to be detected, the reliability of the data is improved and the detection accuracy of the battery to be detected is improved.

[0114] S222: Based on the internal short circuit degree value of each battery to be detected, determine the battery to be detected that has an internal short circuit.

[0115] In one embodiment, the internal short circuit degree value of the battery to be detected is compared with a set range; in response to the internal short circuit degree value of the battery to be detected not being within the set range, it is determined that the battery to be detected has an internal short circuit.

[0116] The setting range may be pre-set or determined according to the interquartile range method.

[0117] In the technical solution of the embodiment of the present application, by comparing the internal short circuit degree value of the battery to be detected with a set range, the batteries to be detected with internal short circuits are screened to improve the detection accuracy.

[0118] In the technical solution of the embodiment of the present application, the internal short circuit degree value of the battery to be tested is determined by the internal short circuit evaluation value of each battery cell contained in the battery to be tested, which facilitates the screening of batteries with internal short circuits based on the internal short circuit degree value of the battery to be tested, thereby improving the screening accuracy.

[0119] See also Figure 7 , Figure 7 It is a schematic diagram of the framework of an embodiment of a battery internal short circuit detection device provided in the present application.

[0120] This embodiment provides a battery internal short circuit detection device 60 . The battery includes a plurality of cells to be detected. The battery internal short circuit detection device 60 includes a sampling module 61 and a processing module 62 .

[0121] The sampling module 61 is used to obtain a voltage sequence corresponding to the battery cell to be tested when it is in the plug-in charging stage; the voltage sequence includes n voltage data collected in sequence according to a preset time interval; n is a positive integer greater than or equal to 2.

[0122] The processing module 62 is used to determine the internal short circuit evaluation value of the battery cell to be detected based on the voltage sequence of the battery cell to be detected; the internal short circuit evaluation value is the degree of internal short circuit of the battery cell to be detected; based on the internal short circuit evaluation value of each battery cell to be detected, determine the battery cell to be detected with internal short circuit in the battery; and is also used to determine the m lowest voltage frequencies corresponding to the battery cell to be detected based on the voltage sequence of the battery cell to be detected; m is a positive integer less than or equal to n; based on the m lowest voltage frequencies corresponding to the battery cell to be detected, determine the internal short circuit evaluation value of the battery cell to be detected.

[0123] In the technical solution of the embodiment of the present application, the internal short circuit evaluation value of the battery cell to be detected is determined by using multiple voltage data of the battery cell to be detected during the plug-in charging stage, thereby improving the reliability of the internal short circuit evaluation value of the battery cell to be detected; and then the battery cells to be detected in the battery are screened based on the internal short circuit evaluation value of the battery cell to be detected, thereby improving the detection accuracy of the battery cells to be detected with internal short circuits in the battery.

[0124] See also Figure 8 , Figure 8 It is a schematic diagram of the framework of another embodiment of the battery internal short circuit detection device provided in the present application.

[0125] This embodiment provides a battery internal short circuit detection device 60 , which includes an acquisition module 71 and a detection module 72 .

[0126] The acquisition module 71 is used to obtain internal short circuit evaluation value sequences corresponding to at least two batteries to be detected. The internal short circuit evaluation value sequences are internal short circuit evaluation values ​​of each cell in the battery to be detected. The internal short circuit evaluation values ​​of the cells are obtained according to the battery internal short circuit detection method in the above embodiment.

[0127] The detection module 72 is used to determine the battery to be detected that has an internal short circuit based on the internal short circuit evaluation value sequence of the battery to be detected.

[0128] In the technical solution of the embodiment of the present application, the internal short circuit evaluation values ​​of the cells contained in each battery to be detected are analyzed respectively to determine the battery to be detected with an internal short circuit, thereby improving the detection accuracy of the battery to be detected.

[0129] See also Fig. 9 , Fig. 9 80 is a schematic diagram of a framework of an embodiment of an electronic terminal provided by the present application. The electronic terminal 80 includes a memory 81 and a processor 82 coupled to each other, and the processor 82 is used to execute a computer program stored in the memory 81 to implement the steps of any of the above-mentioned battery internal short circuit detection method embodiments. In a specific implementation scenario, the electronic terminal 80 may include but is not limited to: a microcomputer, a server, and in addition, the electronic terminal 80 may also include a mobile device such as a laptop computer and a tablet computer, which is not limited here.

[0130] Specifically, the processor 82 is used to control itself and the memory 81 to implement the steps of any of the above-mentioned battery internal short circuit detection method embodiments. The processor 82 can also be called a CPU (Central Processing Unit). The processor 82 may be an integrated circuit chip with signal processing capabilities. The processor 82 can also be a general-purpose processor, a digital signal processor (Digital Signal Processor, DSP), an application-specific integrated circuit (Application Specific Integrated Circuit, ASIC), a field-programmable gate array (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor, etc. In addition, the processor 82 can be implemented by an integrated circuit chip.

[0131] See also Fig.10 , Fig.10 The computer-readable storage medium 90 stores program instructions 901 that can be executed by a processor, and the program instructions 901 are used to implement the steps of any of the above-mentioned battery internal short circuit detection method embodiments.

[0132] In some embodiments, the functions or modules included in the device provided by the embodiments of the present disclosure can be used to execute the method described in the above method embodiments. The specific implementation thereof can refer to the description of the above method embodiments, and for the sake of brevity, it will not be repeated here.

[0133] The above description of various embodiments tends to emphasize the differences between the various embodiments. The same or similar aspects can be referenced to each other, and for the sake of brevity, they will not be repeated herein.

[0134] In the several embodiments provided in the present application, it should be understood that the disclosed methods and devices can be implemented in other ways. For example, the device implementation described above is only schematic. For example, the division of modules or units is only a logical function division. There may be other division methods in actual implementation, such as units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, and the indirect coupling or communication connection of devices or units can be electrical, mechanical or other forms.

[0135] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0136] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions to enable a computer device (which can be a personal computer, server, or network device, etc.) or a processor to execute all or part of the steps of each implementation method of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program code.

[0137] The above are only implementation modes of the present invention, and are not intended to limit the patent protection scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A method for detecting a short circuit in a battery, characterized in that: The battery comprises at least two cells to be detected, and the battery internal short circuit detection method comprises: Obtain a voltage sequence corresponding to the battery cell to be detected when it is in the plug-in charging stage; the voltage sequence includes n voltage data collected in sequence according to a preset time interval; n is a positive integer greater than or equal to 2; Based on the voltage sequence of the battery cell to be detected, determining an internal short circuit evaluation value of the battery cell to be detected; the internal short circuit evaluation value is the degree of internal short circuit of the battery cell to be detected; Based on the internal short circuit evaluation value of each of the cells to be detected, determining the cells to be detected that have an internal short circuit in the battery; Wherein, determining the internal short circuit evaluation value of the battery cell to be detected based on the voltage sequence of the battery cell to be detected includes: Based on the voltage sequence of the battery cell to be detected, determining m lowest voltage frequencies corresponding to the battery cell to be detected, where m is a positive integer less than or equal to n; Based on the m lowest voltage frequencies corresponding to the battery cell to be detected, an internal short circuit evaluation value of the battery cell to be detected is determined.

2. The method for detecting short circuit in a battery according to claim 1, characterized in that: The step of obtaining a voltage sequence corresponding to the battery cell to be detected being in a plug-in charging stage includes: Acquire a plurality of voltage data collected sequentially according to the preset time intervals when the battery cell to be detected is in the plug charging stage; Determining the remaining power at the collection time based on the voltage data at the collection time; The voltage data when the remaining power is in a preset power range is extracted and sorted according to the collection time to generate the voltage sequence; the preset power range is [A, B], where the value range of A is [5%, 35%]; the value range of B is [65%, 100%].

3. The method for detecting short circuit in a battery according to claim 2, characterized in that: The value range of A is [10%, 30%]; the value range of B is [70%, 100%].

4. The method for detecting short circuit in a battery according to claim 1, characterized in that: The determining, based on the voltage sequence of the battery cell to be detected, m lowest voltage frequencies corresponding to the battery cell to be detected includes: Traversing each collection moment in the gun charging stage; Compare the voltage data of all the cells to be detected in the battery at the same collection time, and determine an updated value of each cell to be detected at each collection time; the updated value is 0 and / or 1; Based on the updated value of the battery cell to be detected at each of the collection moments, m lowest voltage frequencies corresponding to the battery cell to be detected are determined.

5. The method for detecting short circuit in a battery according to claim 4, characterized in that: The step of comparing the voltage data of all the cells to be detected in the battery at the same collection time to determine an updated value of each cell to be detected at each collection time includes: Selecting the voltage data with the smallest value among the voltage data of all the cells to be detected corresponding to the collection time as the minimum voltage at the collection time; In response to the voltage data of the battery cell to be detected at the collection time being equal to the minimum voltage at the collection time, determining that the update value of the battery cell to be detected at the collection time is 0; In response to the voltage data of the battery cell to be detected at the collection time being greater than the minimum voltage at the collection time, it is determined that the update value of the battery cell to be detected at the collection time is 1.

6. The method for detecting a short circuit in a battery according to claim 4, characterized in that: The n voltage data in the voltage sequence are arranged in ascending order or descending order according to the acquisition time; The determining m lowest voltage frequencies corresponding to the battery cell to be detected based on the updated value of the battery cell to be detected at each of the acquisition moments includes: Sliding in sequence from the first voltage data in the voltage sequence to the last voltage data in sequence using a preset range; the preset range refers to the number of sequentially adjacent acquisition moments; Based on the updated values ​​at each of the acquisition moments within the preset range, the lowest voltage frequency corresponding to the current sliding is determined.

7. The method for detecting short circuit in a battery according to claim 6, characterized in that: The determining the internal short circuit evaluation value of the battery cell to be detected based on the m lowest voltage frequencies corresponding to the battery cell to be detected includes: Based on the difference between the lowest voltage frequency of the mth sliding corresponding to the battery cell to be detected, the lowest voltage frequency of the first sliding, and the total number of the acquisition moments in the plug charging stage, the internal short circuit evaluation value of the battery cell to be detected is determined.

8. The method for detecting a short circuit in a battery according to claim 1, wherein: The step of determining the battery cell to be detected having an internal short circuit in the battery based on the internal short circuit evaluation value of each battery cell to be detected comprises: Sorting the internal short circuit evaluation values ​​of all the cells to be tested in the battery according to their numerical values ​​to generate an internal short circuit evaluation value sequence; Determine the upper quartile and the lower quartile corresponding to the internal short circuit evaluation value sequence; Determine the interquartile range corresponding to the internal short circuit evaluation value sequence according to the upper quartile and the lower quartile; Determine a threshold range based on the interquartile range, the upper quartile, and the lower quartile corresponding to the internal short circuit evaluation value sequence; Each of the internal short circuit evaluation values ​​is compared with the threshold range to determine whether the battery cell to be detected corresponding to the internal short circuit evaluation value has an internal short circuit.

9. A method for detecting short circuit in a battery, characterized in that: include: Obtaining internal short circuit evaluation value sequences corresponding to at least two batteries to be detected, respectively, wherein the internal short circuit evaluation value sequences are internal short circuit evaluation values ​​of each battery cell in the batteries to be detected, and the internal short circuit evaluation values ​​of the battery cells are obtained according to the battery internal short circuit detection method according to any one of claims 1 to 8; Based on the internal short circuit evaluation value sequence of the battery to be detected, the battery to be detected having an internal short circuit is determined.

10. The method for detecting short circuit in a battery according to claim 9, characterized in that: The step of determining the battery to be detected having an internal short circuit based on the internal short circuit evaluation value sequence of the battery to be detected comprises: Determining the internal short circuit degree value of the battery to be detected based on the internal short circuit evaluation value sequence of the battery to be detected; Based on the internal short circuit degree value of each of the batteries to be detected, the batteries to be detected that have internal short circuits are determined.

11. The method for detecting short circuit in a battery according to claim 10, characterized in that: The step of determining the internal short circuit degree value of the battery to be detected based on the internal short circuit evaluation value sequence of the battery to be detected comprises: Subtracting each of the internal short circuit evaluation values ​​corresponding to the battery to be tested from a threshold value to obtain a difference corresponding to each of the internal short circuit evaluation values; The internal short circuit evaluation value corresponding to the difference with the largest value is selected as the internal short circuit degree value of the battery to be tested.

12. The method for detecting short circuit in a battery according to claim 10, characterized in that: The step of determining the battery to be detected having an internal short circuit based on the internal short circuit degree value of each battery to be detected comprises: Comparing the internal short circuit degree value of the battery to be tested with a set range; In response to the internal short circuit degree value of the battery to be detected not being within the set range, it is determined that the battery to be detected has an internal short circuit.

13. A battery internal short circuit detection device, characterized in that: The battery comprises at least two cells to be tested, and the battery internal short circuit detection device comprises: A sampling module is used to obtain a voltage sequence corresponding to the battery cell to be detected when it is in the plug-in charging stage; the voltage sequence includes n voltage data collected in sequence according to a preset time interval; n is a positive integer greater than or equal to 2; A processing module is used to determine an internal short circuit evaluation value of the battery cell to be detected based on the voltage sequence of the battery cell to be detected; the internal short circuit evaluation value is the degree of internal short circuit of the battery cell to be detected; based on the internal short circuit evaluation value of each battery cell to be detected, determine the battery cell to be detected with internal short circuit in the battery; and is also used to determine m minimum voltage frequencies corresponding to the battery cell to be detected based on the voltage sequence of the battery cell to be detected; m is a positive integer less than or equal to n; based on the m minimum voltage frequencies corresponding to the battery cell to be detected, determine the internal short circuit evaluation value of the battery cell to be detected.

14. A battery internal short circuit detection device, characterized in that: include: an acquisition module, used to acquire internal short circuit evaluation value sequences corresponding to at least two batteries to be detected, wherein the internal short circuit evaluation value sequences are internal short circuit evaluation values ​​of each battery cell in the batteries to be detected, and the internal short circuit evaluation values ​​of the battery cells are obtained according to the battery internal short circuit detection method according to any one of claims 1 to 8; The detection module is used to determine whether the battery to be detected has an internal short circuit based on the internal short circuit evaluation value sequence of the battery to be detected.

15. An electronic terminal, characterized in that: The electronic terminal includes a memory, a processor, and a computer program stored in the memory and running on the processor, wherein the processor is used to execute program data to implement the steps in the battery internal short circuit detection method according to any one of claims 1 to 12.

16. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps in the battery internal short circuit detection method according to any one of claims 1 to 12 are implemented.

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