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

Abstract

The present invention provides a battery internal short circuit detection method, device, terminal, and computer-readable storage medium. The battery internal short circuit detection method includes obtaining a voltage sequence corresponding to a cell to be detected when it is in a plug-in charging stage; the voltage sequence includes n voltage data collected sequentially according to a preset time interval; n is a positive integer greater than or equal to 2; based on the voltage sequence of the cell to be detected, determining an internal short circuit assessment value of the cell to be detected; the internal short circuit assessment value is the degree of internal short circuit in the cell to be detected; and based on the internal short circuit assessment value of each cell to be detected, determining the cell to be detected in the battery that has an internal short circuit. The internal short circuit assessment value of the cell to be detected is determined by using multiple voltage data of the cell to be detected in the plug-in charging stage, thereby improving the reliability of the internal short circuit assessment value of the cell to be detected; and then, based on the internal short circuit assessment value of the cell to be detected, screening the cells to be detected in the battery, thereby improving the accuracy of detecting the cells to be detected in the battery that have an internal short circuit.

Description

Technical Field

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

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

[0003] Traditional battery internal short circuit detection methods use the battery's voltage drop rate and temperature rise rate to detect internal short circuits. Because voltage can fluctuate dramatically with operating conditions, and temperature acquisition is affected by the layout of the temperature sensor, the accuracy of traditional battery internal short circuit detection methods 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 includes:

[0006] 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;

[0007] Determine an internal short circuit evaluation value of the battery cell to be tested based on the voltage sequence of the battery cell to be tested; the internal short circuit evaluation value is the degree of internal short circuit of the battery cell to be tested;

[0008] Based on the internal short circuit evaluation value of each battery cell to be tested, the battery cell to be tested with an internal short circuit in the battery is determined.

[0009] In the technical solution of the embodiment of the present application, the internal short circuit evaluation value of the battery cell to be tested is determined by multiple voltage data of the battery cell to be tested during the plug-in charging stage, thereby improving the reliability of the internal short circuit evaluation value of the battery cell to be tested; and then the battery cells to be tested in the battery are screened based on the internal short circuit evaluation value of the battery cell to be tested, thereby improving the detection accuracy of the battery cells to be tested that have internal short circuits in the battery.

[0010] In some embodiments, determining an internal short circuit evaluation value of the battery cell to be tested based on a voltage sequence of the battery cell to be tested includes:

[0011] Based on the voltage sequence of the battery cell to be tested, determine m lowest voltage frequencies corresponding to the battery cell to be tested; m is a positive integer less than or equal to n;

[0012] An internal short circuit evaluation value of the battery cell to be tested is determined based on the m lowest voltage frequencies corresponding to the battery cell to be tested.

[0013] In the technical solution of the embodiment of the present application, the minimum voltage frequency of the battery cell to be tested is determined by multiple voltage data of the battery cell to be tested 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 tested, thereby improving the accuracy of the internal short circuit evaluation value of the battery cell to be tested.

[0014] In some embodiments, determining m lowest voltage frequencies corresponding to the battery cells to be tested based on the voltage sequence of the battery cells to be tested includes:

[0015] Traverse each collection moment during the gun charging phase;

[0016] 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;

[0017] Based on the updated value of the battery cell to be detected at each collection moment, m lowest voltage frequencies corresponding to the battery cell to be detected are determined.

[0018] 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 at the same time in the battery, 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.

[0019] In some embodiments, comparing the voltage data of all cells to be tested in the battery at the same collection time to determine the updated value of each cell to be tested at each collection time includes:

[0020] 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;

[0021] 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;

[0022] 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.

[0023] 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 acquisition moment, it is determined whether the voltage data of the battery cell to be tested at the current moment is the minimum voltage, and then the minimum voltage frequency of the battery cell to be tested is determined, so as to improve the accuracy of the short-circuit evaluation value of the battery cell to be tested.

[0024] In some embodiments, the n voltage data in the voltage sequence are arranged in ascending order or descending order according to the acquisition time;

[0025] Based on the updated value of the battery cell to be detected at each acquisition moment, the m lowest voltage frequencies corresponding to the battery cell to be detected are determined, including:

[0026] 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 consecutively adjacent acquisition moments;

[0027] Based on the updated values ​​at each acquisition moment within a preset range, the lowest voltage frequency corresponding to the current sliding is determined.

[0028] 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 of 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 tested.

[0029] In some embodiments, determining the internal short circuit evaluation value of the battery cell to be tested based on the m lowest voltage frequencies corresponding to the battery cell to be tested includes:

[0030] The internal short circuit evaluation value of the battery cell to be tested is determined based on 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 tested, and the total number of sampling moments in the plug-in charging stage.

[0031] In the technical solution of the embodiment of the present application, the internal short circuit evaluation value of the battery cell to be tested 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 tested.

[0032] In some embodiments, determining a battery cell to be tested having an internal short circuit in a battery based on an internal short circuit evaluation value of each battery cell to be tested includes:

[0033] Sort 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;

[0034] Determine the upper quartile and lower quartile corresponding to the internal short circuit evaluation value sequence;

[0035] According to the upper quartile and the lower quartile, determine the interquartile range corresponding to the internal short circuit evaluation value sequence;

[0036] Determine the threshold range based on the interquartile range, upper quartile, and lower quartile corresponding to the internal short circuit evaluation value sequence;

[0037] Compare each internal short circuit evaluation value with a threshold range to determine whether the battery cell to be tested corresponding to the internal short circuit evaluation value has an internal short circuit.

[0038] In the technical solution of the embodiment of the present application, the upper quartile, lower quartile and 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.

[0039] In some embodiments, obtaining a voltage sequence corresponding to a battery cell to be tested in a plug-in charging stage includes:

[0040] Acquire multiple voltage data collected sequentially according to preset time intervals when the battery cell to be tested is in the plug-in charging stage;

[0041] Determine the remaining power at the time of collection based on the voltage data at the time of collection;

[0042] 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%].

[0043] 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.

[0044] In some embodiments, the value range of A is [10%, 30%]; the value range of B is [70%, 100%].

[0045] 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.

[0046] In a second aspect, the present application provides a method for detecting a short circuit in a battery, comprising:

[0047] Obtaining internal short circuit evaluation value sequences corresponding to at least two batteries to be tested, wherein the internal short circuit evaluation value sequences are internal short circuit evaluation values ​​of each cell in the batteries to be tested, and the internal short circuit evaluation values ​​of the cells are obtained according to the battery internal short circuit detection method of the first aspect described above;

[0048] 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.

[0049] 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.

[0050] In some embodiments, determining that a battery to be tested has an internal short circuit based on a sequence of internal short circuit evaluation values ​​of the battery to be tested includes:

[0051] Determining an 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;

[0052] Based on the internal short circuit degree value of each battery to be tested, the battery to be tested with internal short circuit is determined.

[0053] 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.

[0054] In some embodiments, 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 includes:

[0055] Subtracting 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;

[0056] The internal short circuit evaluation value corresponding to the largest difference is selected as the internal short circuit degree value of the battery to be tested.

[0057] 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.

[0058] In some embodiments, determining a battery to be tested that has an internal short circuit based on the internal short circuit degree value of each battery to be tested includes:

[0059] Compare the internal short circuit degree value of the battery to be tested with the set range;

[0060] In response to the internal short circuit degree value of the battery to be tested not being within the set range, it is determined that the battery to be tested has an internal short circuit.

[0061] 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 battery to be detected with internal short circuit is screened, thereby improving the detection accuracy.

[0062] In a third aspect, the present application provides a battery internal short circuit detection device, wherein the battery includes at least two cells to be detected, and the battery internal short circuit detection device includes:

[0063] 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;

[0064] The processing module is used to determine the internal short circuit evaluation value of the battery cell to be tested based on the voltage sequence of the battery cell to be tested; the internal short circuit evaluation value is the internal short circuit degree of the battery cell to be tested; based on the internal short circuit evaluation value of each battery cell to be tested, determine the battery cell to be tested that has an internal short circuit in the battery.

[0065] In a fourth aspect, the present application provides a battery internal short circuit detection device, comprising:

[0066] an acquisition module, configured to acquire internal short-circuit evaluation value sequences corresponding to at least two batteries to be tested, the internal short-circuit evaluation value sequences being internal short-circuit evaluation values ​​of respective cells in the batteries to be tested, the internal short-circuit evaluation values ​​of the cells being obtained according to the battery internal short-circuit detection method of the first aspect;

[0067] 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.

[0068] 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, wherein the processor is used to execute program data to implement the steps in the battery short circuit detection method as described in the first and second aspects above.

[0069] 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 of the battery internal short circuit detection method according to the first and second aspects are implemented.

[0070] 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.

[0071] 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

[0072] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. 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 paying any creative work.

[0073] Figure 1 This is a flow chart of an embodiment of a method for detecting a short circuit in a battery provided by the present application;

[0074] Figure 2 yes Figure 1 A flowchart of a specific embodiment of step S11 in the provided method for detecting a short circuit in a battery;

[0075] Figure 3 yes Figure 1 A flowchart of a specific embodiment of step S12 in the provided method for detecting a short circuit in a battery;

[0076] Figure 4 yes Figure 3 A schematic diagram of the preset range in step S123 of the provided battery internal short circuit detection method;

[0077] Figure 5 This is a flow chart of another embodiment of the battery internal short circuit detection method provided by the present application;

[0078] Figure 6 yes Figure 5 A flowchart of a specific embodiment of step S22 in the provided battery internal short circuit detection method;

[0079] Figure 7 This is a schematic diagram of the framework of an embodiment of a battery internal short circuit detection device provided by the present application;

[0080] Figure 8 This is a schematic diagram of the framework of another embodiment of the battery internal short circuit detection device provided by the present application;

[0081] Figure 9 This is a schematic diagram of the framework of an embodiment of an electronic terminal provided by the present application;

[0082] Figure 10 It is a schematic diagram of a framework of an embodiment of a computer-readable storage medium provided by this application. DETAILED DESCRIPTION

[0083] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0084] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0085] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0086] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0087] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0088] 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).

[0089] 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., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and 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 device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0090] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0091] Internal short circuits are one of the most common causes of lithium battery safety accidents. Abuse of lithium batteries by external forces, electricity, heat, and other factors, as well as quality defects and foreign matter in the battery manufacturing process, can cause the positive and negative electrodes of lithium batteries to short-circuit, triggering an internal short circuit. The heat generated by the internal short circuit causes a local temperature rise in the battery, which in turn triggers a larger internal short circuit. The continuous accumulation of heat eventually triggers a chain reaction of thermal runaway, leading to safety accidents such as fires and explosions. Therefore, it is particularly important to evaluate battery performance before putting the battery into use, or to detect internal short circuits in the battery during use.

[0092] Traditional battery internal short-circuit detection methods use the battery's voltage drop rate and temperature rise rate to detect internal short circuits. Because voltage can fluctuate dramatically with operating conditions, and temperature acquisition is affected by the layout of the temperature sensor, the accuracy of traditional battery internal short-circuit detection methods cannot be guaranteed.

[0093] The battery internal short circuit detection method provided by the present application includes: obtaining a voltage sequence corresponding to a battery cell to be detected when it is in the plug-in charging stage; the voltage sequence includes n voltage data collected sequentially 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 assessment value of the battery cell to be detected; the internal short circuit assessment value is the degree of internal short circuit of the battery cell to be detected; based on the internal short circuit assessment value of each battery cell to be detected, determining the battery cell to be detected with an internal short circuit in the battery. By screening out the battery cell with an internal short circuit based on the voltage differences between the battery cells in the battery, the accuracy of battery internal short circuit detection is improved.

[0094] The battery type to which the battery internal short circuit detection method provided in this application is applicable is not limited. It should be noted that the battery internal short circuit detection method proposed in this application can be applied to lithium battery detection scenarios of new energy vehicles.

[0095] See also Figure 1 , Figure 1 It is a flow chart of an embodiment of a method for detecting internal short circuit in a battery provided by the present application.

[0096] This application provides a method for detecting internal short circuits in batteries. The method provided in this embodiment can be executed by a vehicle-mounted battery management system (BMS), a server, or the cloud. The battery management system (BMS) is a key component for ensuring the safe and efficient operation of battery packs. It is the vital link between the vehicle's power battery and the electric vehicle. The battery includes at least two cells to be tested. The method includes the following steps.

[0097] 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.

[0098] S12: Determine an internal short circuit evaluation value of the battery cell to be tested based on the voltage sequence of the battery cell to be tested; the internal short circuit evaluation value is the degree of internal short circuit of the battery cell to be tested.

[0099] S13: Based on the internal short circuit evaluation value of each battery cell to be tested, determine the battery cell to be tested that has an internal short circuit in the battery.

[0100] In the technical solution of the embodiment of the present application, the internal short circuit evaluation value of the battery cell to be tested is determined by multiple voltage data of the battery cell to be tested during the plug-in charging stage, thereby improving the reliability of the internal short circuit evaluation value of the battery cell to be tested; and then the battery cells to be tested in the battery are screened based on the internal short circuit evaluation value of the battery cell to be tested, thereby improving the detection accuracy of the battery cells to be tested that have internal short circuits in the battery.

[0101] See also Figure 2 , Figure 2 yes Figure 1 A flowchart of a specific embodiment of step S11 in a battery internal short circuit detection method is provided.

[0102] In one embodiment, a specific implementation method of obtaining a voltage sequence corresponding to when the battery cell to be tested is in the plug-in charging stage in step S11 is as follows.

[0103] S111: Acquire a plurality of voltage data collected sequentially according to preset time intervals when the battery cell to be tested is in a plug-in charging stage.

[0104] In one embodiment, the voltage data of each battery cell to be tested in the battery is collected at preset time intervals by the BMS system of the vehicle. Each voltage data has corresponding operating condition information. The operating condition information includes a charging stage and a discharging stage. The voltage data of the battery cell to be tested is screened based on the operating condition information of the voltage data. If the battery cell to be tested has an internal short circuit, the voltage data of the battery cell to be tested during the charging stage changes more significantly. Therefore, in order to improve the detection accuracy of internal short circuits in the battery cell, the operating condition information is extracted as multiple voltage data in the charging stage, and the voltage data is analyzed to determine whether the battery cell to be tested has an internal short circuit. By improving the reliability of the voltage data, the accuracy of internal short circuit detection in the battery cell is improved.

[0105] In one embodiment, in order to further improve the reliability of voltage data, the electrical parameters of each battery cell to be tested 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, and 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 that each battery cell to be tested in the battery can be compared under the same unit to improve the detection accuracy.

[0106] By performing data cleaning on the electrical parameters collected during the charging phase of the battery cell to be tested, abnormal electrical parameters collected can be eliminated, thereby improving the reliability of the test data and thus improving the accuracy of internal short circuit detection of the battery cell.

[0107] S112: Determine the remaining power at the time of collection based on the voltage data at the time of collection.

[0108] In one embodiment, each battery cell to be tested has a corresponding voltage-state of charge (SOC) curve, which describes the relationship between battery voltage and discharge capacity. Based on the voltage data of the battery cell to be tested at each acquisition moment, the remaining capacity corresponding to each voltage data in the corresponding voltage-SOC curve is determined.

[0109] S113: extracting voltage data of the remaining power within a preset power range and sorting the data according to the collection time to generate a voltage sequence.

[0110] Specifically, the preset power range is [A, B], where the value range of A is [5%, 35%]; the value range of B is [65%, 100%].

[0111] 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.

[0112] 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%.

[0113] In some embodiments, the retained voltage data is sorted in ascending order according to the collection time to generate a voltage sequence of the battery cells to be tested. The time difference between the collection times of adjacent voltage data in the voltage sequence meets a preset time difference. The preset time difference can be 5 minutes, 10 minutes, etc.

[0114] 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.

[0115] Through the above steps, the voltage sequence corresponding to each battery cell to be tested during the plug-in charging stage can be obtained, which improves the reliability of the data and facilitates improving the detection accuracy.

[0116] In one embodiment, a specific implementation of determining the internal short circuit evaluation value of the battery cell to be tested based on the voltage sequence of the battery cell to be tested in step S12 is as follows.

[0117] Specifically, based on the voltage sequence of the battery cell to be tested, m lowest voltage frequencies corresponding to the battery cell to be tested are determined, 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 tested, an internal short circuit assessment value of the battery cell to be tested is determined.

[0118] In the technical solution of this embodiment, the minimum voltage frequency of the battery cell to be tested is determined by multiple voltage data of the battery cell to be tested 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 tested, thereby improving the accuracy of the internal short circuit evaluation value of the battery cell to be tested.

[0119] See also Figure 3 , Figure 3 yes Figure 1 A flowchart of a specific embodiment of step S12 in a battery internal short circuit detection method is provided.

[0120] In a specific embodiment, the step of determining m lowest voltage frequencies corresponding to the battery cells to be detected based on the voltage sequence of the battery cells to be detected specifically includes the following specific implementation methods.

[0121] S121: Traverse each collection moment in the gun charging stage.

[0122] S122: Compare the voltage data of all 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.

[0123] In one embodiment, the voltage data with the smallest value among the voltage data of all cells to be tested 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 tested at the collection time being equal to the minimum voltage at the collection time being, the updated value of the cell to be tested at the collection time being determined to be 0. In response to the voltage data of the cell to be tested at the collection time being greater than the minimum voltage at the collection time being, the updated value of the cell to be tested at the collection time being determined to be 1.

[0124] 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 acquisition moment, it is determined whether the voltage data of the battery cell to be tested at the current moment is the minimum voltage, and then the minimum voltage frequency of the battery cell to be tested is determined, so as to improve the accuracy of the short-circuit evaluation value of the battery cell to be tested.

[0125] 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.

[0126] In one embodiment, a preset range is used to sequentially slide from the first voltage data point in the voltage sequence toward the last voltage data point; the preset range refers to the number of consecutively adjacent acquisition moments; and based on the updated values ​​of each acquisition moment within the preset range, the lowest voltage frequency corresponding to the current slide is determined. Specifically, the preset range includes increasing the accuracy of the short-circuit characteristic parameter by summing and averaging the first or second values ​​corresponding to the acquisition moments within the window, thereby improving the accuracy of battery short circuit detection. The number of acquisition moments includes, but is not limited to, 5, 3, 7, etc.

[0127] 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 of 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 tested.

[0128] 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.

[0129] 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.

[0130] In a specific embodiment, the preset range can be five consecutive collection moments. For example, the updated values ​​of the battery cell to be tested 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, sliding is performed in sequence from the updated value of the first collection moment corresponding to the voltage sequence to the updated value of the last collection moment according to the preset range. The number of collection moments that can be slid backward each time includes but is not limited to 1, 2, etc., and the minimum voltage frequency corresponding to each slide is then determined.

[0131] 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 at the same time in the battery, 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.

[0132] 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.

[0133] The n voltage data points in the voltage sequence are arranged in ascending or descending order based on the collection time. The internal short circuit assessment value of the cell under test is determined based on the difference between the lowest voltage frequency of the mth sliding motion and the lowest voltage frequency of the first sliding motion corresponding to the cell under test, as well as the total number of collection times during the plug-in charging phase. The mth sliding motion is the last sliding motion. The total number of collection times is also the total number of voltage data points in the voltage sequence. The total number of voltage data points in the voltage sequence is the same as the total number of collection times.

[0134] In a specific embodiment, the ratio of 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 tested to 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 tested.

[0135] Specifically, the internal short circuit evaluation value of the battery cell to be tested is calculated based on the following formula.

[0136] (Formula 1)

[0137] Where: h1 represents the internal short circuit evaluation value of the first 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 represents the total number of sampling moments during the plug-in charging stage.

[0138] In the technical solution of the embodiment of the present application, the internal short circuit evaluation value of the battery cell to be tested 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 tested.

[0139] The internal short circuit evaluation value of each battery cell to be tested in the battery can be obtained through the above steps.

[0140] Specifically, in step S13 , the specific implementation of determining the battery cells to be detected having internal short circuits in the battery based on the internal short circuit evaluation values ​​of the battery cells to be detected is as follows.

[0141] 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.

[0142] In one embodiment, the internal short circuit evaluation values ​​of all battery cells to be tested in the battery are sorted according to their 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.

[0143] In one specific embodiment, the interquartile range method can be used to detect internal short circuits in each battery cell under test based on its internal short circuit assessment value to determine whether each cell under test has an internal short circuit. The interquartile range (IQR) is a statistical method used to measure the middle 50% of a data distribution. It is expressed by calculating the difference between the upper quartile (Q3) and the lower quartile (Q1) of a data set. The IQR is often used for outlier detection because it is sensitive to fluctuations in the middle of a data set while being less sensitive to extreme values. The IQR calculation method is: IQR = Q3 - Q1; where Q1 is the 25th percentile (lower quartile) and Q3 is the 75th percentile (upper quartile). The IQR can be used to determine whether a data point is an outlier. Generally, the rule for defining a data point as an outlier is: if it is below Q1 - 1.5 × IQR or above Q3 + 1.5 × IQR, it is considered an outlier.

[0144] For example, the short-circuit assessment values ​​of all cells to be tested in the battery are sorted in ascending or descending order based on numerical value. The upper quartile (Q3) and lower quartile (Q1) are obtained from the sorting. The IQR is calculated based on the upper quartile (Q3) and lower quartile (Q1). A threshold range is determined based on the upper quartile (Q3), lower quartile (Q1), and a preset value. The preset value can be 1.5 or any other value. The threshold range is [Q1 - 1.5 × IQR, Q3 + 1.5 × IQR]. A determination is then made as to whether the short-circuit assessment value of each cell to be tested in the battery is within the threshold range. If the short-circuit assessment value of the cell to be tested is within the threshold range, the cell to be tested is determined to be normal. If the short-circuit assessment value of the cell to be tested is outside the threshold range, the cell to be tested is determined to be abnormal, indicating an internal short circuit.

[0145] In the technical solution of the embodiment of the present application, the upper quartile, lower quartile and 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.

[0146] See also Figure 5 , Figure 5 This is a flow chart of another embodiment of the battery internal short circuit detection method provided by the present application.

[0147] This embodiment provides a method for detecting a short circuit in a battery. The method is executed by a server or a cloud. The method includes the following steps.

[0148] S21: Obtain internal short circuit evaluation value sequences corresponding to at least two batteries to be tested, where the internal short circuit evaluation value sequences are internal short circuit evaluation values ​​of each cell in the battery to be tested.

[0149] S22: Based on the internal short circuit evaluation value sequence of the batteries to be tested, determine the batteries to be tested that have internal short circuits.

[0150] 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.

[0151] Specifically, in step S21 , a specific implementation method 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 is as follows.

[0152] In one embodiment, the battery to be tested includes at least two cells, and the method for determining the internal short circuit evaluation value of each cell is the same as the method for determining the internal short circuit evaluation value of the battery to be tested in the above embodiment, which will not be repeated here.

[0153] The internal short circuit evaluation value of each cell in the battery to be tested is obtained by the method for determining the internal short circuit evaluation value of the battery to be tested in the above embodiment. An internal short circuit evaluation value sequence of the battery to be tested is formed based on the internal short circuit evaluation values ​​of all cells in the battery to be tested.

[0154] See also Figure 6 , Figure 6 yes Figure 5 A flowchart of a specific embodiment of step S22 in a battery internal short circuit detection method is provided.

[0155] Specifically, the specific implementation of determining the battery to be tested that has an internal short circuit based on the internal short circuit evaluation value sequence of the battery to be tested in step S22 is as follows.

[0156] S221: Determine 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.

[0157] In one specific embodiment, to improve the accuracy of the test results, each internal short-circuit assessment value corresponding to the battery under test is subtracted from a threshold value to obtain the corresponding difference. The internal short-circuit assessment value corresponding to the largest difference is selected as the internal short-circuit severity value of the battery under test. In other words, the internal short-circuit severity value of the battery under test has the largest deviation from the threshold value.

[0158] 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.

[0159] 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.

[0160] In one embodiment, the internal short circuit degree value of the battery to be tested is compared with a set range; in response to the internal short circuit degree value of the battery to be tested not being within the set range, it is determined that the battery to be tested has an internal short circuit.

[0161] The setting range may be pre-set or determined according to the interquartile range method.

[0162] 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 battery to be detected with internal short circuit is screened, thereby improving the detection accuracy.

[0163] 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.

[0164] 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.

[0165] 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 .

[0166] The sampling module 61 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.

[0167] 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.

[0168] In the technical solution of the embodiment of the present application, the internal short circuit evaluation value of the battery cell to be tested is determined by multiple voltage data of the battery cell to be tested during the plug-in charging stage, thereby improving the reliability of the internal short circuit evaluation value of the battery cell to be tested; and then the battery cells to be tested in the battery are screened based on the internal short circuit evaluation value of the battery cell to be tested, thereby improving the detection accuracy of the battery cells to be tested that have internal short circuits in the battery.

[0169] 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.

[0170] This embodiment provides a battery internal short circuit detection device 60 , which includes an acquisition module 71 and a detection module 72 .

[0171] 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.

[0172] The detection module 72 is configured to determine which battery to be detected has an internal short circuit based on the internal short circuit evaluation value sequence of the battery to be detected.

[0173] 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.

[0174] See also Figure 9 , Figure 9 is a schematic diagram of a framework of an embodiment of an electronic terminal provided herein. The electronic terminal 80 includes a memory 81 and a processor 82 coupled to each other. The processor 82 is configured to execute a computer program stored in the memory 81 to implement the steps of any of the aforementioned embodiments of the method for detecting a short circuit within a battery. In a specific implementation scenario, the electronic terminal 80 may include, but is not limited to, a microcomputer and a server. Furthermore, the electronic terminal 80 may also include mobile devices such as laptops and tablet computers, which are not limited herein.

[0175] Specifically, the processor 82 is used to control itself and the memory 81 to implement the steps of any of the above-mentioned embodiments of the battery internal short circuit detection method. The processor 82 can also be referred to as 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 (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. The general-purpose processor can be a microprocessor or any conventional processor. In addition, the processor 82 can be implemented by an integrated circuit chip.

[0176] See also Figure 10 , Figure 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.

[0177] 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 can refer to the description of the above method embodiments. For the sake of brevity, it will not be repeated here.

[0178] The above description of the various embodiments tends to emphasize the differences between the various embodiments. The same or similar aspects can be referenced with each other and will not be repeated herein for the sake of brevity.

[0179] In the several embodiments provided in this application, it should be understood that the disclosed methods and devices can be implemented in other ways. For example, the device implementation methods described above are 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. For example, 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.

[0180] In addition, the functional units in the various embodiments of the present application may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0181] 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, or the part that contributes to the existing technology, 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 and includes a number of instructions for enabling 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 the various implementation methods 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.

[0182] The above are merely embodiments of the present invention and are not intended to limit the scope of patent protection of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention's description and drawings, or directly or indirectly applied in other related technical fields, are also included in the scope of patent protection of the present invention.

Claims

1. A method for detecting a short circuit in a battery, characterized in that: The battery includes at least two cells to be tested, and the battery internal short circuit detection method 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 sequentially according to a preset time interval; n is a positive integer greater than or equal to 2; Determining 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 of the cells to be tested, determining the cell to be tested having 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 tested, determining m lowest voltage frequencies corresponding to the battery cell to be tested, where m is a positive integer less than or equal to n; An internal short circuit evaluation value of the battery cell to be detected is determined based on the m lowest voltage frequencies corresponding to the battery cell to be detected.

2. The battery internal short circuit detection method according to claim 1, characterized in that: The step of obtaining a voltage sequence corresponding to the battery cell to be detected being in the plug-in charging stage includes: Acquire a plurality of voltage data of the battery cell to be tested that are sequentially collected according to the preset time intervals when the battery cell is in the plug charging stage; Determining the remaining power at the time of collection based on the voltage data at the time of collection; 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 battery internal short circuit detection method 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 battery internal short circuit detection method 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; Comparing the voltage data of all the cells to be detected in the battery at the same collection time, and determining 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 battery internal short circuit detection method according to claim 4, characterized in that: The 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 tested corresponding to the collection moment as the minimum voltage at the collection moment; 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, an updated value of the battery cell to be detected at the collection time is determined to be 1.

6. The battery internal short circuit detection method 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, based on the updated value of the battery cell to be detected at each of the acquisition moments, m lowest voltage frequencies corresponding to the battery cell to be detected includes: Sliding 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 of the acquisition moments within the preset range, the lowest voltage frequency corresponding to the current sliding is determined.

7. The battery internal short circuit detection method 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: An internal short circuit evaluation value of the battery cell to be detected is determined based on a 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 a total number of acquisition moments in the plug charging stage.

8. The battery internal short circuit detection method according to claim 1, characterized in that: 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 includes: 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; Determining a threshold range based on the interquartile range, the upper quartile, and the lower quartile corresponding to the internal short circuit evaluation value sequence; Compare each of the internal short circuit evaluation values ​​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 a short circuit in a battery, characterized in that: include: Obtaining internal short circuit evaluation value sequences corresponding to at least two batteries to be tested, wherein the internal short circuit evaluation value sequences are internal short circuit evaluation values ​​of each cell in the batteries to be tested, and the internal short circuit evaluation values ​​of the 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 that has an internal short circuit is determined.

10. The battery internal short circuit detection method according to claim 9, characterized in that: The step of determining 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 includes: Determining an 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 of the batteries to be tested, the batteries to be tested that have internal short circuits are determined.

11. The battery internal short circuit detection method 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 includes: 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 battery internal short circuit detection method 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 includes: 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 includes at least two cells to be tested, and the battery internal short circuit detection device includes: A sampling module 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; 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 of the battery cells to be detected, the battery cell to be detected with an internal short circuit in the battery is determined; and is also used to determine 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, the internal short circuit evaluation value of the battery cell to be detected is determined.

14. A battery internal short circuit detection device, characterized in that: include: an acquisition module, configured to acquire internal short circuit evaluation value sequences corresponding to at least two batteries to be tested, wherein the internal short circuit evaluation value sequences are internal short circuit evaluation values ​​of each cell in the batteries to be tested, and the internal short circuit evaluation values ​​of the 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 configured to determine whether the battery to be detected has an internal short circuit based on a sequence of internal short circuit evaluation values ​​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 configured to execute program data to implement the steps of 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 of the battery internal short circuit detection method according to any one of claims 1 to 12 are implemented.

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