Micro short circuit detection method, electronic equipment and storage medium

Abstract

The invention provides a micro short circuit detection method, electronic equipment and a storage medium, and relates to the technical field of batteries. The method comprises the following steps: carrying out voltage regulation by respectively charging or discharging a plurality of to-be-detected battery cells, so that respective voltages of the plurality of to-be-detected battery cells are within a preset voltage range; connecting a plurality of to-be-detected battery cells, and detecting the current of each to-be-detected battery cell to obtain a plurality of current results; and for each to-be-detected battery cell, according to the current result corresponding to the to-be-detected battery cell, the micro short circuit condition of the to-be-detected battery cell is determined, and the micro short circuit condition comprises that the to-be-detected battery cell has micro short circuit or the to-be-detected battery cell is normal, so that the micro short circuit detection efficiency is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a micro-short circuit detection method, electronic equipment and storage medium. Background Art

[0002] The cell is the power storage part of the battery, and the performance of the cell can directly determine the performance of the battery. During the battery preparation process, it is usually necessary to detect the micro short circuit of the cell to ensure the safety of the battery.

[0003] In the related art, the K value detection method is usually used to measure the self-discharge performance of the battery cell, so as to determine whether the battery cell has a micro-short circuit. The K value is the voltage drop of the battery cell per unit time. Specifically, the battery cell to be tested is allowed to stand for the first time, and the open circuit voltage (OVC) of the battery cell to be tested is measured at time T1. The battery cell to be tested is allowed to stand for the second time, and the open circuit voltage of the battery cell to be tested is measured at time T2. The K value is the difference between the open circuit voltages measured twice, and the ratio of the time difference between time T2 and time T1. Based on the K value, it can be determined whether the battery cell has a micro-short circuit.

[0004] However, when judging the micro short circuit condition of the battery cell by the K value detection method, it takes a lot of time to stand still for a long time, resulting in low efficiency of micro short circuit detection. Summary of the invention

[0005] The present application provides a micro-short circuit detection method, an electronic device and a storage medium to solve the problem of low efficiency of micro-short circuit detection due to the need for long-term static state and the consumption of a lot of time when judging the micro-short circuit condition of a battery cell by a K value detection method, thereby achieving the purpose of improving the detection efficiency.

[0006] In a first aspect, the present application provides a micro short circuit detection method, the method comprising:

[0007] The voltage of the plurality of cells to be tested is adjusted by charging or discharging the cells to be tested respectively, so that the voltage of each of the plurality of cells to be tested is within a preset voltage range;

[0008] Connecting the plurality of cells to be tested, detecting the current of each cell to be tested, and obtaining a plurality of current results;

[0009] For each of the battery cells to be tested, a micro-short circuit condition of the battery cell to be tested is determined according to a current result corresponding to the battery cell to be tested, wherein the micro-short circuit condition includes that the battery cell to be tested has a micro-short circuit, or that the battery cell to be tested is normal.

[0010] Through the method provided in the first aspect, the voltage of the multiple cells to be tested is adjusted by charging or discharging them respectively, so that the voltage of each of the multiple cells to be tested is within the preset voltage range. Therefore, before detecting the micro-short circuit of the cell to be tested, the cell to be tested is pre-processed so that the voltage, temperature, etc. of the cell to be tested are consistent, and the influence of the differences in voltage, temperature, etc. between the multiple cells to be tested due to differences in manufacturing process, storage conditions, material properties, etc. is quickly eliminated or reduced. The multiple cells to be tested after voltage adjustment are connected, and the current of each cell to be tested is detected to obtain multiple current results. For each cell to be tested, the micro-short circuit of the cell to be tested is determined according to the current result corresponding to the cell to be tested, thereby shortening the time for detecting the micro-short circuit of the cell to be tested, quickly identifying the micro-short circuit defects and differences of the cell to be tested, and improving the detection efficiency.

[0011] In a possible design, the voltage regulation by charging or discharging a plurality of cells to be tested respectively includes:

[0012] For each of the battery cells to be tested, detecting a first open circuit voltage of the battery cell to be tested;

[0013] When the first open circuit voltage is outside the preset voltage range, determining the difference between the first open circuit voltage and a reference voltage as a first adjustment voltage, wherein the reference voltage is a voltage value within the preset voltage range;

[0014] charging or discharging the battery cell to be tested according to the first adjustment voltage and a first parameter, wherein the first parameter is a parameter for evaluating the relationship between the capacity and the voltage of the battery cell to be tested;

[0015] After a first time period, detecting a second open circuit voltage of the battery cell to be tested, wherein the first time period includes a second time period for charging or discharging the battery cell to be tested and a third time period for waiting for the battery cell to be tested to be stable after being charged or discharged;

[0016] When the second open circuit voltage is within the preset voltage range, completing voltage regulation of the battery cell to be tested;

[0017] When the second open circuit voltage is outside the preset voltage range, a new first parameter is calculated according to the first open circuit voltage, the second open circuit voltage, and the amount of electricity charged or discharged to the battery cell to be tested, and a difference between the second open circuit voltage and the reference voltage is determined as a new first adjustment voltage;

[0018] The battery cell to be tested continues to be charged or discharged according to the new first parameter and the new first adjustment voltage until the second open circuit voltage of the battery cell to be tested is within the preset voltage range.

[0019] In a possible design, the multiple cells to be tested are connected, and the current of each cell to be tested is detected to obtain multiple current results, including:

[0020] Connecting the plurality of cells to be tested in parallel;

[0021] The current of each of the cells to be tested is detected to obtain a plurality of current results.

[0022] In a possible design, the multiple cells to be tested are connected, and the current of each cell to be tested is detected to obtain multiple current results, including:

[0023] Obtaining a third open circuit voltage of each of the battery cells to be tested;

[0024] According to the third open circuit voltage, the battery cells to be tested are grouped to obtain a plurality of battery cell groups, wherein a first voltage difference of the battery cell groups is less than a second voltage difference of the plurality of battery cells to be tested before grouping, the first voltage difference being a difference between an open circuit voltage of a battery cell to be tested having the largest third open circuit voltage in the battery cell group and an open circuit voltage of a battery cell to be tested having the smallest third open circuit voltage, and the second voltage difference being a difference between an open circuit voltage of a battery cell to be tested having the largest third open circuit voltage among the plurality of battery cells to be tested before grouping and an open circuit voltage of a battery cell to be tested having the smallest third open circuit voltage;

[0025] Connect the cells to be tested in each cell group in parallel respectively;

[0026] The current of each of the cells to be tested is detected to obtain a plurality of current results.

[0027] In a possible design, before voltage regulation is performed on the plurality of cells to be tested, the method further includes:

[0028] The plurality of cells to be tested are buffered and left to stand for a fourth period of time.

[0029] In a possible design, before detecting the current of each of the battery cells to be tested, the method further includes:

[0030] The plurality of cells to be tested are buffered and left to stand for a fifth period of time.

[0031] In one possible design, the fifth duration is less than or equal to 2 hours.

[0032] In a possible design, determining the micro-short circuit condition of the battery cell to be tested according to the current result corresponding to the battery cell to be tested includes:

[0033] When the absolute value of the current result is greater than a preset current range, it is determined that a micro short circuit exists in the battery cell to be tested;

[0034] When the absolute value of the current result is within a preset current range, it is determined that the battery cell to be tested is normal.

[0035] In a second aspect, the present application provides a micro-short circuit detection device, which is a module for executing the micro-short circuit detection method in the first aspect and any possible design of the first aspect.

[0036] In a third aspect, the present application provides an electronic device comprising a memory and a processor, wherein the memory stores a computer executable program or instructions, and when the processor executes the computer executable program or instructions, it can implement the micro-short circuit detection method as described in the first aspect and any possible design of the first aspect.

[0037] In a fourth aspect, the present application provides an electronic device comprising a processor, wherein when the processor executes a computer executable program or instruction in a memory, the micro-short circuit detection method as described in the first aspect and any possible design of the first aspect is implemented.

[0038] In a fifth aspect, the present application provides a computer-readable storage medium, on which a computer-executable program or instructions are stored. When the computer-executable program or instructions are executed by a processor, a micro-short circuit detection method as provided in the first aspect of an embodiment of the present application and any possible design of the first aspect is implemented.

[0039] In a sixth aspect, the present application provides a computer program product, comprising: execution instructions, the execution instructions are stored in a readable storage medium, at least one processor of an electronic device can read the execution instructions from the readable storage medium, and at least one processor executes the execution instructions so that the electronic device implements the method in the first aspect and any possible design of the first aspect.

[0040] The above description is only an overview of the technical solution of the embodiment of the present application. In order to more clearly understand the technical means of the embodiment 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 embodiment 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

[0041] Figure 1 A flow chart of a micro-short circuit detection method provided in one embodiment of the present application.

[0042] Figure 2 A flowchart of a voltage regulation method provided in one embodiment of the present application.

[0043] Figure 3 A flowchart of a voltage regulation method provided in one embodiment of the present application.

[0044] Figure 4A flow chart of a current detection method provided in one embodiment of the present application.

[0045] Figure 5 A flow chart of a current detection method provided in one embodiment of the present application.

[0046] Figure 6 A flow chart of a micro-short circuit detection method provided in one embodiment of the present application.

[0047] Figure 7 A flow chart of a micro-short circuit detection method provided in one embodiment of the present application.

[0048] Figure 8 A flow chart of a micro-short circuit detection method provided in one embodiment of the present application.

[0049] Fig. 9 A flow chart of a micro-short circuit detection method provided in one embodiment of the present application.

[0050] Fig.10 A schematic structural diagram of a micro-short circuit detection device provided in one embodiment of the present application.

[0051] Fig.11 A schematic diagram of the structure of an electronic device provided in one embodiment of the present application.

[0052] Fig.12 A schematic diagram of the structure of an electronic device provided in one embodiment of the present application. DETAILED DESCRIPTION

[0053] In this application, "at least one" means one or more, and "plurality" means two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. The character " / " generally indicates that the associated objects before and after are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b, or c alone can represent: a, b, c, a and b, a and c, or a, b, and c, where a, b, and c can be single or multiple. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0054] The directions or positional relationships indicated by terms such as "center", "longitudinal", "lateral", "up", "down", "left", "right", "front", and "back" are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present application and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present application.

[0055] The terms "connected" and "connected" should be understood in a broad sense. For example, the "connected" or "connected" of a circuit structure can refer to not only physical connection, but also electrical connection or signal connection. For example, it can be directly connected, that is, physically connected, or indirectly connected through at least one intermediate element, as long as the circuit is connected, or it can be the internal connection of two elements; signal connection can refer to signal connection through a circuit or through a media medium, such as radio waves. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0056] Exemplarily, the present application provides a micro-short circuit detection method, device, electronic device, storage medium, program and chip. By pre-processing the battery cell to be tested before detecting the micro-short circuit of the battery cell to be tested, the voltage, temperature, etc. of the battery cell to be tested are made consistent, and the influence of differences between multiple battery cells to be tested due to differences in manufacturing process, storage conditions, material properties, etc. is quickly eliminated, thereby shortening the time for detecting the micro-short circuit of the battery cell to be tested, quickly identifying the micro-short circuit defects and differences of the battery cell to be tested, and improving the detection efficiency.

[0057] Among them, the micro-short circuit detection method provided in the present application can be executed by an electronic device, or by a micro-short circuit detection device in an electronic device.

[0058] Among them, the electronic device can be a server, a desktop computer, a mobile phone, a tablet computer, a laptop computer, a wearable device, a vehicle-mounted device, an augmented reality (AR) / virtual reality (VR) device, etc.

[0059] Among them, the micro-short circuit detection device can be implemented by a combination of software and / or hardware. For example, the micro-short circuit detection device can be an application (application, APP), a web page or a public account, etc. In order to simplify the description, the embodiment of the present application is described by taking the execution of the micro-short circuit detection device as an example.

[0060] Next, combine Figure 1 , the micro-short circuit detection method provided in an embodiment of the present application is described.

[0061] See also Figure 1 , Figure 1 This is a flow chart of a micro short circuit detection method provided in one embodiment of the present application. Figure 1 As shown, the method includes:

[0062] S101 , respectively charging or discharging a plurality of cells to be tested to adjust voltages so that the voltages of the plurality of cells to be tested are within a preset voltage range.

[0063] The multiple battery cells to be tested may be battery cells produced in the same batch, and the specifications of the multiple battery cells to be tested are the same.

[0064] For example, the multiple cells to be tested may be cylindrical cells produced in the same batch, with a diameter of 18 mm and a height of 65 mm, a rated capacity of 2200 mAh, and an operating voltage range of 2.8 V to 4.2 V. Among them, 2.8 V in the operating voltage range is the discharge cut-off voltage, and 4.2 V in the operating voltage range is the charge cut-off voltage.

[0065] Since there may be differences in manufacturing process, storage conditions, material properties, etc. during the production of batteries, these differences will lead to voltage differences even between batteries of the same specification. If there are differences in the voltage of the batteries, it will affect the time to detect the micro short circuit of the batteries. Therefore, before detecting the micro short circuit of the batteries, the voltage of the batteries can be adjusted in advance by charging or discharging to ensure the consistency of the batteries when entering the detection process.

[0066] The voltage of the cell to be tested is the open circuit voltage of the cell to be tested. The micro short circuit detection device can determine a preset voltage range according to a preset voltage.

[0067] Among them, the preset voltage has various forms.

[0068] The preset voltage is a voltage within the operating voltage range of the battery cell to be tested.

[0069] In some examples, the micro-short circuit detection device can determine a preset voltage based on the specifications of the battery cell to be tested.

[0070] For example, when the operating voltage range in the specifications of the battery cell to be tested is 2.8V to 4.2V, the micro-short circuit detection device can set the preset voltage to 3.7V.

[0071] In other examples, the micro-short circuit detection device can respectively obtain the voltages of multiple battery cells to be tested, and determine the average value of the voltages of the multiple battery cells to be tested as the preset voltage, or select the maximum voltage among the voltages of the multiple battery cells to be tested and determine it as the preset voltage, or select the minimum voltage among the voltages of the multiple battery cells to be tested and determine it as the preset voltage.

[0072] In some other examples, the micro-short circuit detection device can select a voltage within the range of ±200 mV of the average value of the voltages of the multiple battery cells to be tested and determine it as the preset voltage.

[0073] In some other examples, the micro-short circuit detection device may select a cell to be tested from multiple cells to be tested as a reference cell, obtain the voltage of the reference cell, and determine the voltage of the reference cell as a preset voltage.

[0074] After determining the preset voltage, the micro-short circuit detection device may determine the range of the preset voltage±preset threshold as the preset voltage range.

[0075] For example, the preset voltage is 3.7V, the preset threshold is 1μV, and the preset voltage range may be [3.7V-1μV, 3.7V+1μV].

[0076] Among them, the micro-short circuit detection device can adjust the voltage of multiple battery cells to be tested through various charging or discharging methods.

[0077] For example, the micro-short circuit detection device can discharge the battery cells to be tested whose voltage is higher than the preset voltage through capacitance, resistance or inductance to reduce the voltage, and charge the battery cells to be tested whose voltage is lower than the preset voltage through capacitance, pulse or series connection to increase the voltage, thereby adjusting the voltage of all battery cells to be tested to the preset voltage. This method can quickly adjust the voltage of the battery cells to be tested and ensure the consistency of multiple battery cells to be tested.

[0078] In addition to voltage regulation by charging or discharging, the micro-short circuit detection device can also connect multiple battery cells to be tested in parallel through a low-resistance parallel circuit to perform parallel voltage regulation.

[0079] S102, connecting a plurality of cells to be tested, detecting the current of each cell to be tested, and obtaining a plurality of current results.

[0080] Specifically, the micro-short circuit detection device can connect the positive and negative electrodes of multiple battery cells to be tested respectively. For each battery cell to be tested, the micro-short circuit detection device can detect the current of the circuit where the battery cell to be tested is located through a current sensor to obtain the current result of the battery cell to be tested.

[0081] S103 . For each battery cell to be tested, determine the micro short circuit condition of the battery cell to be tested according to the current result corresponding to the battery cell to be tested.

[0082] The micro short circuit condition includes that the battery cell to be tested has a micro short circuit, or that the battery cell to be tested is normal.

[0083] For each battery cell to be tested, the micro-short circuit detection device can determine the micro-short circuit condition of the battery cell to be tested by comparing the current result with the preset current range.

[0084] Specifically, when the absolute value of the current result is greater than a preset current range, the micro-short circuit detection device determines that a micro-short circuit exists in the battery cell to be tested.

[0085] When the absolute value of the current result is within the preset current range, the micro-short circuit detection device determines that the battery cell to be tested is normal.

[0086] Among them, the preset current range can be set according to the different batches of multiple battery cells to be tested and user needs, and this application does not limit this.

[0087] In an embodiment of the present application, the micro-short circuit detection device adjusts the voltage of multiple cells to be tested by charging or discharging them respectively, so that the voltage of each of the multiple cells to be tested is within a preset voltage range. Therefore, before detecting the micro-short circuit of the cell to be tested, the cell to be tested is pre-processed so that the voltage, temperature, etc. of the cell to be tested are consistent, and the influence of the differences in voltage, temperature, etc. between the multiple cells to be tested due to differences in manufacturing process, storage conditions, material properties, etc. is quickly eliminated or reduced. The micro-short circuit detection device connects the multiple cells to be tested after voltage adjustment, detects the current of each cell to be tested, obtains multiple current results, and for each cell to be tested, determines the micro-short circuit of the cell to be tested according to the current result corresponding to the cell to be tested, thereby shortening the time for detecting the micro-short circuit of the cell to be tested, quickly identifying the micro-short circuit defects and differences of the cell to be tested, and improving the detection efficiency.

[0088] Based on the above exemplary description, in S101, the micro-short circuit detection device can adjust the voltage of multiple battery cells to be tested in multiple ways.

[0089] Next, combine Figure 2 and Figure 3 , the voltage regulation method is explained.

[0090] See also Figure 2 , Figure 2 This is a flow chart of a voltage regulation method provided in one embodiment of the present application. Figure 2 As shown, the method includes:

[0091] S201 : For each battery cell to be tested, detect a first open circuit voltage of the battery cell to be tested.

[0092] The first open circuit voltage refers to the voltage measured when the battery cell to be tested is not connected to any load before voltage regulation. The first open circuit voltage can reflect the potential difference generated by the internal chemical reaction of the battery cell to be tested.

[0093] Due to various physical differences, the open circuit voltages of the cells to be tested of the same specification may be different. Voltage regulation is to adjust the open circuit voltages of the cells to be tested so that the open circuit voltages of multiple cells to be tested are consistent.

[0094] Specifically, for each battery cell to be tested, the micro-short circuit detection device can measure the first open circuit voltage of the battery cell to be tested by connecting a voltage measuring device such as a multimeter or a voltmeter to the battery cell to be tested.

[0095] S202: Determine whether the first open circuit voltage is within a preset voltage range.

[0096] If the first open-circuit voltage is within the preset voltage range, the micro-short circuit detection device executes S207; if the first open-circuit voltage is outside the preset voltage range, the micro-short circuit detection device executes S203.

[0097] S203: Determine the difference between the first open circuit voltage and the reference voltage as the first adjustment voltage.

[0098] The reference voltage is a voltage value within a preset voltage range. The micro-short circuit detection device can select a voltage value within the preset voltage range to determine as the reference voltage, that is, the reference voltage can be used as a standard for adjusting the voltage of the battery cell to be tested, so that the voltage of the battery cell to be tested after voltage adjustment is within the preset voltage range.

[0099] Among them, the first adjustment voltage can reflect the difference between the open circuit voltage of the battery cell to be tested and the reference voltage. According to the difference, the micro-short circuit detection device can know the degree to which the voltage of the battery cell to be tested needs to be adjusted.

[0100] When the first open circuit voltage is greater than the reference voltage, the first adjustment voltage is a positive value, and when the first open circuit voltage is less than the reference voltage, the first adjustment voltage is a negative value.

[0101] When the first open circuit voltage is greater than the reference voltage, it indicates that the micro-short circuit detection device needs to reduce the open circuit voltage of the battery cell to be tested, and the reduced value is the absolute value of the first adjustment voltage. When the first open circuit voltage is less than the reference voltage, it indicates that the micro-short circuit detection device needs to increase the open circuit voltage of the battery cell to be tested, and the increased value is the absolute value of the first adjustment voltage.

[0102] In addition, the micro-short circuit detection device can also directly determine the absolute value of the difference between the first open-circuit voltage and the reference voltage as the first adjustment voltage.

[0103] S204: Charge or discharge the battery cell to be tested according to the first adjustment voltage and the first parameter.

[0104] The first parameter is a parameter used to evaluate the relationship between the capacity and voltage of the battery cell to be tested.

[0105] The first parameter may be a capacity-voltage ratio dQ / dV of the battery cell to be tested at a first open circuit voltage, and the capacity-voltage ratio dQ / dV represents the amount of electricity contained in the battery cell to be tested within a unit voltage range.

[0106] When initially adjusting the voltage of the battery cell to be tested, the first parameter may be a parameter pre-set according to the specifications of the battery cell to be tested. Alternatively, the micro-short circuit detection device may randomly select a battery cell to be tested from multiple battery cells to be tested, obtain the capacity-voltage ratio of the battery cell to be tested, and determine the capacity-voltage ratio of the battery cell to be tested as the first parameter.

[0107] Based on the first adjustment voltage and the first parameter, the micro-short circuit detection device can determine the amount of electricity charged or discharged for the battery cell to be tested.

[0108] Among them, the micro-short circuit detection device can determine the amount of electricity charged or discharged for the battery cell to be tested through the following formula 1.

[0109] ΔQ1=ΔU1×dQ / dV1 Formula 1;

[0110] Wherein, ΔQ1 is the amount of electricity charged or discharged to the battery cell to be tested, ΔU1 is the first adjustment voltage, and dQ / dV1 is the capacity-voltage ratio of the battery cell to be tested at the first open circuit voltage.

[0111] Among them, the micro-short circuit detection device can charge or discharge the battery cell to be tested through constant current, ramp, AC and other methods.

[0112] Based on this, the micro-short circuit detection device selects a suitable charging or discharging mode, and when the first adjustment voltage is greater than zero, the battery cell to be tested is discharged, and the discharge current is negative. When the first adjustment voltage is less than zero, the battery cell to be tested is charged, and the charging current is positive.

[0113] S205 , after a first period of time, detecting a second open circuit voltage of the battery cell to be tested.

[0114] The first time period includes a second time period for charging or discharging the battery cell to be tested and a third time period for waiting for the battery cell to be tested to be stable after being charged or discharged.

[0115] The second time duration is the time duration for which the micro-short circuit detection device charges or discharges the battery cell to be tested.

[0116] The micro-short circuit detection device can determine the second time period according to the amount of electricity charged or discharged by the battery cell to be tested.

[0117] Among them, the micro-short circuit detection device can determine the second time length through the following formula 2.

[0118]

[0119] Wherein, t1 is the second time duration, and I1 is the charging current or discharging current of the battery cell to be tested.

[0120] Based on this, after the second period of time, the micro-short circuit detection device completes charging or discharging the battery cell to be tested, and the amount of charging or discharging reaches the requirement.

[0121] After the battery cell to be tested is charged or discharged, polarization will occur in the battery cell to be tested. If the second open circuit voltage is detected immediately, the result may be inaccurate. Therefore, the micro short circuit detection device needs to wait for a third period of time, waiting for the battery cell to be tested to be stable after being charged or discharged, and then detect the second open circuit voltage of the battery cell to be tested.

[0122] The first open circuit voltage of the battery cell to be tested will change during the charging or discharging process. After completing charging or discharging and waiting for the third period of time, the micro-short circuit detection device detects the open circuit voltage of the battery cell to be tested again to obtain a second open circuit voltage. The detection method is similar to S201 and will not be repeated here.

[0123] S206: Determine whether the second open circuit voltage is within a preset voltage range.

[0124] If the second open circuit voltage is within the preset voltage range, the micro short circuit detection device executes S207; if the second open circuit voltage is outside the preset voltage range, the micro short circuit detection device executes S208.

[0125] S207, completing voltage regulation of the battery cell to be tested.

[0126] If the second open circuit voltage is within the preset voltage range, it means that the voltage state of the battery cell to be tested has met the voltage regulation requirement, thereby completing the voltage regulation of the battery cell to be tested.

[0127] S208, calculate a new first parameter according to the first open circuit voltage, the second open circuit voltage and the amount of electricity charged or discharged to the battery cell to be tested, and determine the difference between the second open circuit voltage and the reference voltage as a new first adjustment voltage, and continue to charge or discharge the battery cell to be tested according to the new first adjustment voltage and the new first parameter, that is, continue to execute S204 until the second open circuit voltage of the battery cell to be tested is within the preset voltage range.

[0128] If the second open circuit voltage is outside the preset voltage range, the battery cell to be tested needs to be voltage adjusted again. At this time, since the open circuit voltage of the battery cell to be tested has changed, the micro-short circuit detection device can recalculate the new first parameter based on the first open circuit voltage, the second open circuit voltage and the amount of electricity charged or discharged by the battery cell to be tested, so that the new first parameter can be used for voltage adjustment during the next voltage adjustment process.

[0129] Among them, the micro-short circuit detection device can determine the new first parameter through the following formula three.

[0130]

[0131] Wherein, dQ / dV1 is a new first parameter, OCV1 is a first adjustment voltage, and OCV2 is a second adjustment voltage.

[0132] Based on this, the above operation is performed on each of the multiple battery cells to be tested, so that the voltage of each of the multiple battery cells to be tested is within the preset voltage range, and the multiple battery cells to be tested achieve consistency. This method can adjust each battery cell to be tested separately, and the adjustment accuracy is high, which helps to improve the accuracy of judging the micro-short circuit situation of the battery cell to be tested.

[0133] Next, another voltage regulation method is introduced.

[0134] See also Figure 3 , Figure 3 This is a flow chart of a voltage regulation method provided in one embodiment of the present application. Figure 3 As shown, the method includes:

[0135] S301 , controlling a plurality of cells to be tested to be connected in parallel in sequence.

[0136] Specifically, the micro-short circuit detection device can connect the positive electrodes of multiple cells to be tested through wires, and connect the negative electrodes of multiple cells to be tested through wires, so as to connect the multiple cells to be tested in parallel in sequence.

[0137] After multiple cells to be tested are connected in parallel, the voltages of the cells to be tested can be automatically balanced.

[0138] S302 , buffering the plurality of cells to be tested and leaving them to stand for a sixth period of time, so that the voltages of the plurality of cells to be tested are automatically balanced.

[0139] Among them, the sixth duration can be set based on experience.

[0140] The voltage of multiple cells to be tested is adjusted by parallel automatic balancing, so that the multiple cells to be tested can reach consistency without complicated processing, the process is simple and the cost is low.

[0141] Based on the above exemplary description, in S102, the micro-short circuit detection device can detect the current of the battery cell to be tested in a variety of ways.

[0142] Next, combine Figure 4 and Figure 5 , a method for detecting the current of the battery cell to be tested is described.

[0143] See also Figure 4 , Figure 4 This is a flow chart of a current detection method provided in one embodiment of the present application. Figure 4 As shown, the method includes:

[0144] S401, connecting a plurality of cells to be tested in parallel.

[0145] Specifically, the micro-short circuit detection device can connect the positive electrodes and negative electrodes of multiple cells to be tested respectively, thereby achieving parallel connection.

[0146] S402: Detect the current of each battery cell to be tested to obtain multiple current results.

[0147] For each battery cell to be tested, the micro-short circuit detection device can detect the current of the circuit where the battery cell to be tested is located through a current sensor to obtain the current result of the battery cell to be tested.

[0148] Next, another method for detecting the current of the battery cell to be tested is introduced.

[0149] See also Figure 5 , Figure 5 This is a flow chart of a current detection method provided in one embodiment of the present application. Figure 5 As shown, the method includes:

[0150] S501. Obtain a third open circuit voltage of each battery cell to be tested.

[0151] The third open circuit voltage refers to the voltage measured when the battery cell to be tested is not connected to any load after voltage adjustment, and the third open circuit voltage can reflect the potential difference generated by the chemical reaction inside the battery cell.

[0152] The micro-short circuit detection device can obtain the third open circuit voltage in a variety of ways.

[0153] As a feasible implementation method, for each battery cell to be tested, the micro-short circuit detection device can measure the third open circuit voltage of the battery cell to be tested by connecting a voltage measuring device such as a multimeter or a voltmeter to the battery cell to be tested.

[0154] As another feasible implementation method, the micro-short circuit detection device can obtain the open circuit voltage measured in the previous process of the battery cell to be tested. For example, during the voltage adjustment process of the battery cell to be tested, when the second open circuit voltage is within a preset voltage range, the micro-short circuit detection device can determine the second open circuit voltage as the third open circuit voltage, thereby eliminating the need to measure the open circuit cell of the battery cell to be tested again, further improving the detection efficiency.

[0155] S502 . Group the cells to be tested according to the third open-circuit voltage to obtain a plurality of cell groups.

[0156] The first voltage difference of the battery cell group is smaller than the second voltage difference of the plurality of battery cells to be tested before grouping.

[0157] The first voltage difference is a difference between an open circuit voltage of a cell to be tested having the largest third open circuit voltage and an open circuit voltage of a cell to be tested having the smallest third open circuit voltage in the cell group.

[0158] The second voltage difference is a difference between an open circuit voltage of a cell to be tested having the largest third open circuit voltage and an open circuit voltage of a cell to be tested having the smallest third open circuit voltage among the multiple cells to be tested before grouping.

[0159] Specifically, the micro-short circuit detection device can calculate the difference between the largest third open circuit voltage and the smallest third open circuit voltage among the third open circuit voltages of the multiple cells to be tested to obtain the second voltage difference. According to the second voltage difference, the micro-short circuit detection device groups the multiple cells to be tested to obtain multiple cell groups, so that the first voltage difference of each cell group is less than the second voltage difference.

[0160] Wherein, each battery cell group includes at least two battery cells to be tested.

[0161] The following is an example to illustrate the specific method of grouping.

[0162] The number of the plurality of cells to be tested is 10, namely cell A, cell B, cell C, cell D, cell E, cell F, cell G, cell H, cell I and cell J. The third open circuit voltage of each cell to be tested is shown in Table 1 below.

[0163] Table 1

[0164] Cell A 4.002V Cell F 4.0018V Cell B 4.0002V Cell G 4.0008V Cell C 4.0006V Cell H 4.0001V Cell D 4.0016V Battery Cell I 4.0006V Cell E 4.0017V Battery J 4.001V

[0165] Among them, the third open circuit voltage of cell A is the largest, which is 4.002V, and the third open circuit voltage of cell J is the smallest, which is 4.000V, and the first voltage difference is 2mV. The first voltage difference is divided into 5 parts, and combined with the largest third open circuit voltage and the smallest third open circuit voltage, 5 voltage intervals can be obtained, which are 4.000V~4.0004V, 4.0004V~4.0008V, 4.0008V~4.0012V, 4.0012V~4.0016V, and 4.0016V~4.002V.

[0166] The cells to be tested are grouped according to their respective third open circuit voltages and the above-mentioned voltage intervals, and the obtained grouping results are shown in Table 2 below, wherein the cells to be tested whose third open circuit voltages are equal to the left endpoint or the right endpoint of the voltage interval can be grouped in the former interval or the latter interval.

[0167] Table 2

[0168] 4.000V~4.0004V Cell B, Cell H 4.0004V~4.0008V Cell C, Cell I 4.0008V~4.0012V Cell G, Cell J 4.0012V~4.0016V / 4.0016V~~4.002V Cell A, Cell D, Cell E, Cell F

[0169] It can be seen that the maximum voltage difference of the cells to be tested after grouping is smaller than the maximum voltage difference of the cells to be tested before grouping.

[0170] S503 , respectively connect the cells to be tested in each cell group in parallel.

[0171] Specifically, for each battery cell group, the micro-short circuit detection device connects the positive electrode of each battery cell to be tested in the battery cell group to the positive electrode and the negative electrode to the negative electrode, thereby connecting the battery cells to be tested in parallel.

[0172] For example, based on the above Table 2, the micro-short circuit detection device connects battery cell B and battery cell H in parallel, connects battery cell C and battery cell I in parallel, connects battery cell G and battery cell J in parallel, and connects battery cell A, battery cell D, battery cell E and battery cell F in parallel.

[0173] Considering that the larger the voltage difference between the cells to be tested, the less likely it is that the current affected by the micro-short circuit will be identified, it is necessary to wait for the voltage difference to narrow before micro-short circuit detection can be performed. By grouping and then connecting in parallel, the difference in the open-circuit voltage of the cells to be tested in each cell group can be narrowed, thereby narrowing the difference in the open-circuit voltage between the cells to be tested after parallel connection. When the micro-short circuit detection device detects the current, the current affected by the micro-short circuit can be more easily identified, thereby improving not only the detection efficiency but also the detection accuracy.

[0174] S504: Detect the current of each battery cell to be tested to obtain multiple current results.

[0175] For each battery cell to be tested, the micro-short circuit detection device can detect the current of the circuit where the battery cell to be tested is located through a current sensor to obtain the current result of the battery cell to be tested.

[0176] Based on the above exemplary description, before S101, the micro-short circuit detection device may also perform a buffering and static processing on a plurality of cells to be tested.

[0177] See also Figure 6 , Figure 6 This is a flow chart of a micro short circuit detection method provided in one embodiment of the present application. Figure 6 As shown, before S101, the method includes:

[0178] Sa1, buffering the plurality of cells to be tested and leaving them to stand for a fourth period of time.

[0179] Taking into account that during the battery cell manufacturing process, the chemical substances in the battery cells and the environment in which the battery cells are located have not yet reached stability, therefore, before the voltage of the battery cells to be tested is adjusted, multiple battery cells to be tested are cached and left to stand still. This can allow the battery cells to reach a steady state, for example, the chemical substances, temperature, and voltage are stable, thereby further shortening the time consumed for voltage regulation, so that the micro-short circuit detection device can quickly adjust the voltage of the battery cells to be tested to the preset voltage, thereby further improving the efficiency of micro-short circuit detection.

[0180] Based on the above exemplary description, before S103, the micro-short circuit detection device may also perform a buffering and static processing on the multiple cells to be tested.

[0181] See also Figure 7 , Figure 7 This is a flow chart of a micro short circuit detection method provided in one embodiment of the present application. Figure 7 As shown, before S103, the method includes:

[0182] Sa2. Buffer the plurality of cells to be tested and leave them to stand for a fifth period of time.

[0183] Taking into account that the temperature of the battery cell to be tested and the steady state of the internal chemical substances may change after the voltage adjustment, the micro-short circuit detection device may cache multiple battery cells to be tested and let them stand still before detecting the current of the battery cell to be tested after the voltage adjustment, so that the current of the battery cell to be tested can be detected after the battery cell to be tested reaches a steady state. In this way, the micro-short circuit detection device can obtain a more accurate current, which helps to improve the accuracy of micro-short circuit detection.

[0184] In some examples, the fifth duration is less than or equal to 2 hours.

[0185] After voltage regulation and before detecting the current of the battery cell to be tested, the micro-short circuit detection device buffers the plurality of battery cells to be tested and allows them to stand for 0 to 60 minutes, so that the battery cells to be tested can reach a steady state. The specific standing time can be determined according to the actual state of the battery cell to be tested.

[0186] exist Figure 7 On the basis of the embodiment, of course, the micro-short circuit detection device can simultaneously perform buffering and static processing on multiple cells to be tested before S101 and before S103.

[0187] See also Figure 8 , Figure 8 This is a flow chart of a micro short circuit detection method provided in one embodiment of the present application. Figure 8 As shown, before S101, the method includes:

[0188] Sa3, leaving the plurality of cells to be tested cached for a fourth period of time.

[0189] Among them, the description of Sa3 can refer to the above Sa1 and will not be repeated here.

[0190] Based on the above exemplary description, in S103, the micro short circuit detection device can be as follows: Fig. 9 The method shown in the figure is used to determine the micro short circuit condition of the battery cell to be tested.

[0191] Before S103, the method includes:

[0192] Sa4. Buffer the plurality of cells to be tested and leave them to stand for a fifth period of time.

[0193] Among them, the description of Sa4 can refer to the above-mentioned Sa2 and will not be repeated here.

[0194] In this embodiment, the battery cell to be tested is allowed to stand still once before voltage regulation is performed, so that the battery cell to be tested reaches a steady state before voltage regulation is performed, thereby avoiding instability of the battery cell to be tested and avoiding the micro-short circuit detection device from performing multiple voltage regulation on the battery cell to be tested, which can improve the efficiency of voltage regulation. The battery cell to be tested that has completed voltage regulation is allowed to stand still for a second time before current detection, so that the micro-short circuit detection device can detect the current of the battery cell to be tested after the battery cell to be tested reaches a steady state, so that the micro-short circuit detection device can obtain a more accurate current, which helps to improve the accuracy of micro-short circuit detection.

[0195] See also Fig. 9 , Fig. 9 This is a flow chart of a micro short circuit detection method provided in one embodiment of the present application. Fig. 9 As shown, S103 can be implemented by S103A to S103C as follows:

[0196] S103A, determine whether the absolute value of the current result is greater than a preset current range.

[0197] If the absolute value of the current result is greater than the preset current range, the micro-short circuit detection device executes S103B; if the absolute value of the current result is within the preset current range, the micro-short circuit detection device executes S103C.

[0198] S103B. Determine if there is a micro short circuit in the battery cell to be tested.

[0199] S103C, confirm that the battery cell to be tested is normal.

[0200] In addition, when the absolute value of the current result is less than the preset current range, it indicates that the battery cell to be tested may have other problems other than micro short circuits, and the micro short circuit detection device can provide prompts through alarms or other means.

[0201] Fig.10 This is a schematic diagram of the structure of a micro-short circuit detection device provided in one embodiment of the present application. Fig.10 As shown, the device includes: an adjustment module 101, a detection module 102 and a determination module 103.

[0202] The regulating module 101 is used to regulate the voltage of the plurality of cells to be tested by charging or discharging them respectively, so that the voltage of each of the plurality of cells to be tested is within a preset voltage range;

[0203] The detection module 102 is used to connect multiple cells to be tested, detect the current of each cell to be tested, and obtain multiple current results;

[0204] The determination module 103 is used to determine the micro-short circuit condition of each cell to be tested according to the current result corresponding to the cell to be tested, where the micro-short circuit condition includes that the cell to be tested has a micro-short circuit, or that the cell to be tested is normal.

[0205] It should be noted that the micro-short circuit detection device of the embodiment of the present application can be used to implement the technical solution of the above-mentioned method embodiment. Its implementation principle and technical effect are similar and will not be repeated here.

[0206] In some examples, the regulating module 101 is specifically configured to detect a first open circuit voltage of each battery cell to be tested;

[0207] When the first open circuit voltage is outside the preset voltage range, the difference between the first open circuit voltage and the reference voltage is determined as the first adjustment voltage, and the reference voltage is a voltage value within the preset voltage range;

[0208] Charging or discharging the battery cell to be tested according to the first adjustment voltage and the first parameter, wherein the first parameter is a parameter for evaluating the relationship between the capacity and the voltage of the battery cell to be tested;

[0209] After a first time period, detecting a second open circuit voltage of the battery cell to be tested, the first time period including a second time period for charging or discharging the battery cell to be tested and a third time period for waiting for the battery cell to be tested to be stable after being charged or discharged;

[0210] When the second open circuit voltage is within a preset voltage range, voltage regulation of the battery cell to be tested is completed;

[0211] When the second open circuit voltage is outside the preset voltage range, a new first parameter is calculated according to the first open circuit voltage, the second open circuit voltage and the amount of electricity charged or discharged to the battery cell to be tested, and the difference between the second open circuit voltage and the reference voltage is determined as a new first adjustment voltage;

[0212] The battery cell to be tested continues to be charged or discharged according to the new first parameter and the new first adjustment voltage until the second open circuit voltage of the battery cell to be tested is within the preset voltage range.

[0213] In some examples, the detection module 102 is specifically configured to connect a plurality of cells to be tested in parallel;

[0214] The current of each battery cell to be tested is detected to obtain multiple current results.

[0215] In some examples, the detection module 102 is specifically configured to obtain a third open circuit voltage of each battery cell to be tested;

[0216] According to the third open circuit voltage, the cells to be tested are grouped to obtain a plurality of cell groups, wherein the first voltage difference of the cell groups is less than the second voltage difference of the plurality of cells to be tested before grouping, the first voltage difference being the difference between the open circuit voltage of the cell to be tested having the largest third open circuit voltage in the cell group and the open circuit voltage of the cell to be tested having the smallest third open circuit voltage, and the second voltage difference being the difference between the open circuit voltage of the cell to be tested having the largest third open circuit voltage among the plurality of cells to be tested before grouping and the open circuit voltage of the cell to be tested having the smallest third open circuit voltage;

[0217] Connect the cells to be tested in each cell group in parallel respectively;

[0218] The current of each battery cell to be tested is detected to obtain multiple current results.

[0219] In some examples, the micro-short circuit detection device further includes a buffering and quiescent module, which is used to buffer and quiescently store the plurality of cells to be tested for a fourth time period.

[0220] In some examples, the cache standstill module is further used to cache the plurality of cells to be tested for a fifth period of time.

[0221] In some examples, the fifth duration is less than or equal to 2 hours.

[0222] In some examples, the determination module 103 is specifically used to determine that a micro short circuit exists in the battery cell to be tested when the absolute value of the current result is greater than a preset current range;

[0223] When the absolute value of the current result is within the preset current range, it is determined that the battery cell to be tested is normal.

[0224] Fig.11 This is a schematic diagram of the structure of an electronic device provided by an embodiment of the present application. Fig.11 As shown, the electronic device may include: a processor 201 and a memory 202, wherein the memory 202 stores a computer program, and when the processor 201 executes the computer program, the embodiment of the present application is implemented. Figures 1 to 9 The micro short circuit detection method shown.

[0225] Fig.12 This is a schematic diagram of the structure of an electronic device provided by an embodiment of the present application. Fig.12 As shown, the electronic device may include: a processor 301, and when the processor 301 executes a computer executable program or an instruction in a memory to execute a computer program, the embodiment of the present application is implemented. Figures 1 to 9 The micro short circuit detection method shown.

[0226] The electronic device of the present application can be used to execute the technical solution of the above method embodiment, and its implementation principle and technical effect are similar. The operations implemented by each module can be further referred to the relevant description of the method embodiment, which will not be repeated here. The modules here can also be replaced by components or circuits.

[0227] Another embodiment of the present application further provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the present application can be implemented. Figures 1 to 9 The micro short circuit detection method shown.

[0228] Another embodiment of the present application further provides a computer program product, including: an execution instruction, the execution instruction is stored in a readable storage medium, at least one processor of the electronic device can read the execution instruction from the readable storage medium, and at least one processor executes the execution instruction so that the electronic device implements the embodiment of the present application Figures 1 to 9 The micro short circuit detection method shown.

[0229] Another embodiment of the present application further provides a chip, which is connected to a memory, or has a memory integrated thereon. When a software program stored in the memory is executed, the micro-short circuit detection method in the above method embodiment is implemented.

[0230] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic, for example, the division of modules or units is only a logical function division, and there may be other division methods in actual implementation, for example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed.

[0231] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loading and executing computer program instructions on a computer, the process or function according to the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions can be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from a website site, a computer, a server or a data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode to another website site, computer, server or data center. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server, a data center, etc. that contains one or more available media integrated. The available medium can be a magnetic medium, (e.g., a floppy disk, a hard disk, a tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a solid-state hard disk Solid State Disk (SSD)), etc.

[0232] Those skilled in the art will appreciate that, although some embodiments herein include certain features included in other embodiments, the combination of features of different embodiments is meant to be within the scope of the present application and form different embodiments. For example, in the claims, any one of the claimed embodiments may be used in any combination.

[0233] As described above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A micro short circuit detection method, characterized in that: The method comprises: The voltage of the plurality of cells to be tested is adjusted by charging or discharging the cells to be tested respectively, so that the voltage of each of the plurality of cells to be tested is within a preset voltage range; Connecting the plurality of cells to be tested, detecting the current of each cell to be tested, and obtaining a plurality of current results; For each of the battery cells to be tested, a micro-short circuit condition of the battery cell to be tested is determined according to a current result corresponding to the battery cell to be tested, wherein the micro-short circuit condition includes that the battery cell to be tested has a micro-short circuit, or that the battery cell to be tested is normal.

2. The method according to claim 1, characterized in that: The voltage regulation is performed by charging or discharging a plurality of cells to be tested respectively, including: For each of the battery cells to be tested, detecting a first open circuit voltage of the battery cell to be tested; When the first open circuit voltage is outside the preset voltage range, determining the difference between the first open circuit voltage and a reference voltage as a first adjustment voltage, wherein the reference voltage is a voltage value within the preset voltage range; charging or discharging the battery cell to be tested according to the first adjustment voltage and a first parameter, wherein the first parameter is a parameter for evaluating the relationship between the capacity and the voltage of the battery cell to be tested; After a first time period, detecting a second open circuit voltage of the battery cell to be tested, wherein the first time period includes a second time period for charging or discharging the battery cell to be tested and a third time period for waiting for the battery cell to be tested to be stable after being charged or discharged; When the second open circuit voltage is within the preset voltage range, completing voltage regulation of the battery cell to be tested; When the second open circuit voltage is outside the preset voltage range, a new first parameter is calculated according to the first open circuit voltage, the second open circuit voltage, and the amount of electricity charged or discharged to the battery cell to be tested, and a difference between the second open circuit voltage and the reference voltage is determined as a new first adjustment voltage; The battery cell to be tested continues to be charged or discharged according to the new first parameter and the new first adjustment voltage until the second open circuit voltage of the battery cell to be tested is within the preset voltage range.

3. The method according to claim 1, characterized in that The step of connecting the plurality of cells to be tested and detecting the current of each cell to be tested to obtain a plurality of current results includes: Connecting the plurality of cells to be tested in parallel; The current of each of the battery cells to be tested is detected to obtain multiple current results.

4. The method according to claim 1, characterized in that The step of connecting the plurality of cells to be tested and detecting the current of each cell to be tested to obtain a plurality of current results includes: Obtaining a third open circuit voltage of each of the battery cells to be tested; According to the third open circuit voltage, the battery cells to be tested are grouped to obtain a plurality of battery cell groups, wherein a first voltage difference of the battery cell groups is less than a second voltage difference of the plurality of battery cells to be tested before grouping, the first voltage difference being a difference between an open circuit voltage of a battery cell to be tested having the largest third open circuit voltage in the battery cell group and an open circuit voltage of a battery cell to be tested having the smallest third open circuit voltage, and the second voltage difference being a difference between an open circuit voltage of a battery cell to be tested having the largest third open circuit voltage among the plurality of battery cells to be tested before grouping and an open circuit voltage of a battery cell to be tested having the smallest third open circuit voltage; Connect the cells to be tested in each cell group in parallel respectively; The current of each of the battery cells to be tested is detected to obtain multiple current results.

5. The method according to claim 1, characterized in that Before voltage regulation is performed on the plurality of cells to be tested, the method further comprises: The plurality of cells to be tested are buffered and left to stand for a fourth period of time.

6. The method according to claim 1 or 5, characterized in that: Before detecting the current of each of the battery cells to be tested, the method further includes: The plurality of cells to be tested are buffered and left to stand for a fifth period of time.

7. The method according to claim 6, characterized in that The fifth duration is less than or equal to 2 hours.

8. The method according to any one of claims 1 to 4, characterized in that: The step of determining the micro-short circuit condition of the battery cell to be tested according to the current result corresponding to the battery cell to be tested includes: When the absolute value of the current result is greater than a preset current range, it is determined that a micro short circuit exists in the battery cell to be tested; When the absolute value of the current result is within a preset current range, it is determined that the battery cell to be tested is normal.

9. An electronic device, characterized in that: include: at least one memory and at least one processor; The memory is used to store computer-executable programs or instructions; the processor is used to call the computer-executable programs or instructions in the memory, so that the electronic device executes the method according to any one of claims 1 to 8.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer-executable program or instructions, and the computer-executable program or instructions are configured to execute the method according to any one of claims 1 to 8.

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