Detection method and detection device for consistency of reference electrode

Abstract

The embodiment of the invention provides a reference electrode consistency detection method and device, the detection method is suitable for single batteries of a three-electrode system, and the detection method comprises the following steps: measuring positive electrode potentials and / or negative electrode potentials of a plurality of single batteries, positive potentials and negative potentials of the battery monomers are respectively potentials of positive electrodes and negative electrodes of the battery monomers relative to potential platform areas of reference electrodes of the battery monomers, and the positive electrodes, the negative electrodes and the electrolytes of the plurality of battery monomers and the positive electrodes and the negative electrodes of the plurality of battery monomers are consistent in arrangement in the electrolytes of the plurality of battery monomers; and carrying out consistency detection on the reference electrodes of the plurality of battery monomers according to the positive electrode potentials and / or the negative electrode potentials of the plurality of battery monomers. According to the reference electrode consistency detection method and detection device provided by the embodiment of the invention, the consistency of the reference electrodes can be accurately detected.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and more specifically, to a method and a device for detecting the consistency of reference electrodes. Background Art

[0002] Due to advantages such as high energy density, rechargeability, safety, and environmental friendliness, batteries are widely used in new energy vehicles, consumer electronics, energy storage systems, and other fields.

[0003] During the process of electrochemical testing and research of batteries, a three-electrode battery monomer is formed by introducing a reference electrode to separate and quantify the signals of the positive and negative electrodes of multiple battery monomers, so as to determine the performance of the battery monomers. Generally, the higher the consistency of the reference electrodes, the higher the consistency of the test data among multiple battery monomers, and thus the performance of the battery can be accurately determined.

[0004] Therefore, how to determine the consistency of the reference electrodes has become one of the problems to be solved urgently at present. Summary of the Invention

[0005] The embodiments of the present application provide a method and a device for detecting the consistency of reference electrodes, which can accurately detect the consistency of the reference electrodes.

[0006] In a first aspect, a method for detecting the consistency of reference electrodes is provided. The detection method is applicable to a battery monomer in a three-electrode system. The battery monomer includes a positive electrode, a negative electrode, a reference electrode, and an electrolyte. The detection method includes: measuring the positive electrode potential and / or the negative electrode potential of multiple battery monomers. The positive electrode potential of the battery monomer is the potential in the potential plateau region of the positive electrode of the battery monomer relative to the reference electrode of the battery monomer, and the negative electrode potential of the battery monomer is the potential in the potential plateau region of the negative electrode of the battery monomer relative to the reference electrode of the battery monomer respectively. The positive electrodes, negative electrodes, and electrolytes of the multiple battery monomers, and the settings of the positive electrodes and negative electrodes of the multiple battery monomers in the electrolytes of the multiple battery monomers are the same; performing consistency detection on the reference electrodes of the multiple battery monomers according to the measured positive electrode potential and / or negative electrode potential of the multiple battery monomers.

[0007] In the embodiments of the present application, consistency detection can be performed on the reference electrodes of multiple battery monomers according to the measured positive electrode potential and / or negative electrode potential of the multiple battery monomers. Since the potential in the potential plateau region of the positive electrode or the negative electrode of the battery monomer relative to its reference electrode is relatively stable and has small fluctuations, the positive electrode potential in the potential plateau region of the positive electrode of the battery monomer relative to the reference electrode and / or the negative electrode potential in the potential plateau region of the negative electrode of the battery monomer relative to its reference electrode can be used to accurately detect the consistency of the reference electrodes of multiple battery monomers.

[0008] On the other hand, when using multiple battery cells for performance testing, the test platform can measure the positive electrode potential and / or negative electrode potential of multiple battery cells, thereby detecting the consistency of the reference electrodes. Other test components can be avoided, simplifying the design of the detection device for the consistency of the reference electrodes.

[0009] In a possible implementation, measuring the positive electrode potential and / or negative electrode potential of multiple battery cells includes: after lithium plating the reference electrodes of multiple battery cells, measuring the first positive electrode potential and / or first negative electrode potential of multiple battery cells.

[0010] In the embodiments of the present application, the consistency detection of the reference electrodes of multiple battery cells can be achieved by measuring the positive electrode potential and / or negative electrode potential of multiple battery cells after lithium plating the reference electrodes.

[0011] In a possible implementation, according to the measured positive electrode potential and / or negative electrode potential of multiple battery cells, performing consistency detection on the reference electrodes of multiple battery cells includes: performing consistency detection on the reference electrodes of multiple battery cells according to the sum of the measured first positive electrode potentials and / or first negative electrode potentials of multiple battery cells.

[0012] In the embodiments of the present application, the consistency detection of the reference electrodes of multiple battery cells can be performed according to the positive electrode potential and / or negative electrode potential of multiple battery cells after lithium plating the reference electrodes, accurately detecting the consistency of the reference electrodes of multiple battery cells, thereby determining the consistency of the performance test data of multiple battery cells to evaluate the accuracy of the performance detection of battery cells.

[0013] In a possible implementation, measuring the positive electrode potential and / or negative electrode potential of multiple battery cells includes: before lithium plating the reference electrodes of multiple battery cells, measuring the second positive electrode potential and / or second negative electrode potential of multiple battery cells.

[0014] In the embodiments of the present application, the consistency detection of the reference electrodes of multiple battery cells can be achieved by measuring the positive electrode potential and / or negative electrode potential of multiple battery cells before lithium plating the reference electrodes.

[0015] In a possible implementation, according to the measured positive electrode potential and / or negative electrode potential of multiple battery cells, performing consistency detection on the reference electrodes of multiple battery cells includes: performing consistency detection on the reference electrodes of multiple battery cells according to the measured second positive electrode potential and / or second negative electrode potential of multiple battery cells.

[0016] In the embodiments of the present application, the consistency of the reference electrodes of multiple battery cells can be detected according to the positive electrode potential and / or negative electrode potential of multiple battery cells before lithium plating of the reference electrode, so as to accurately detect the consistency of the reference electrodes of multiple battery cells, and thus the consistency of the performance test data of multiple battery cells can be determined to evaluate the accuracy of battery cell performance detection.

[0017] In a possible implementation, measuring the positive electrode potential and / or negative electrode potential of multiple battery cells includes: after performing performance tests on multiple battery cells, measuring the third positive electrode potential and / or third negative electrode potential of multiple battery cells.

[0018] In the embodiments of the present application, the consistency of the reference electrodes of multiple battery cells can be achieved through the positive electrode potential and / or negative electrode potential of multiple battery cells after performance tests.

[0019] In a possible implementation, detecting the consistency of the reference electrodes of multiple battery cells according to the measured positive electrode potential and / or negative electrode potential of multiple battery cells includes: detecting the consistency of the reference electrodes of multiple battery cells according to the measured third positive electrode potential and / or third negative electrode potential of multiple battery cells.

[0020] In the embodiments of the present application, the consistency of the reference electrodes of multiple battery cells can be detected according to the positive electrode potential and / or negative electrode potential of multiple battery cells after performance tests, so as to accurately detect the consistency of the reference electrodes of multiple battery cells, and thus the consistency of the performance test data of multiple battery cells can be determined to evaluate the accuracy of battery cell performance detection.

[0021] In a possible implementation, detecting the consistency of the reference electrodes of multiple battery cells according to the measured positive electrode potential and / or negative electrode potential of multiple battery cells includes: determining N battery cells as battery cells with consistent reference electrodes among multiple battery cells according to the difference between the positive electrode potentials and / or the difference between the negative electrode potentials of multiple battery cells, where the difference between the positive electrode potentials of any two of the N battery cells is less than or equal to a first preset difference, and / or the difference between the negative electrode potentials of any two of the N battery cells is less than or equal to a second preset difference, N≥2 and N is an integer.

[0022] In the embodiments of the present application, the difference between the measured positive electrode potentials of multiple battery cells and / or the difference between the negative electrode potentials are used to determine N battery cells as battery cells with consistent reference electrodes among multiple battery cells. Furthermore, the performance of the battery cells can be determined according to the performance test data with higher consistency of the N battery cells.

[0023] In a possible implementation, before measuring the second positive electrode potential and / or the second negative electrode potential of multiple battery cells, or, before measuring the third positive electrode potential and / or the third negative electrode potential of multiple battery cells, the detection method further includes: charging and discharging multiple battery cells to the potential plateau region of the positive electrode of the multiple battery cells relative to the reference electrode of the multiple battery cells, and / or, charging and discharging multiple battery cells to the potential plateau region of the negative electrode of the multiple battery cells relative to the reference electrode of the multiple battery cells.

[0024] In the embodiments of the present application, by charging and discharging multiple battery cells to the potential plateau region of the positive electrode of the battery cell relative to its reference electrode, and / or, by charging and discharging multiple battery cells to the potential plateau region of the negative electrode of the battery cell relative to its reference electrode, it is convenient to measure the positive electrode potential and / or the negative electrode potential of multiple battery cells, so as to facilitate detecting the consistency of the reference electrodes of multiple battery cells according to the positive electrode potential and / or the negative electrode potential of multiple battery cells.

[0025] In a possible implementation, charging and discharging multiple battery cells to the potential plateau region of the positive electrode of the multiple battery cells relative to the reference electrode of the multiple battery cells includes: charging and discharging multiple battery cells to a first preset SOC, and the SOC corresponding to the potential plateau region of the positive electrode of the battery cell relative to the reference electrode of the battery cell includes the first preset SOC.

[0026] In the embodiments of the present application, multiple battery cells can be charged and discharged to the first preset SOC to adjust the potential plateau region of the positive electrode of the battery cell relative to its reference electrode. In this way, based on the first preset SOC, it is convenient to adjust the battery cell to the potential plateau region of the positive electrode of the battery cell relative to its reference electrode.

[0027] In a possible implementation, charging and discharging multiple battery cells to the potential plateau region of the negative electrode of the multiple battery cells relative to the reference electrode of the multiple battery cells includes: charging and discharging multiple battery cells to a second preset SOC, and the SOC corresponding to the potential plateau region of the negative electrode of the battery cell relative to the reference electrode of the battery cell includes the second preset SOC.

[0028] In the embodiments of the present application, multiple battery cells can be charged and discharged to the second preset SOC to adjust the potential plateau region of the negative electrode of the battery cell relative to its reference electrode. In this way, based on the second preset SOC, it is convenient to adjust the battery cell to the potential plateau region of the negative electrode of the battery cell relative to its reference electrode.

[0029] In a possible implementation, charging and discharging multiple battery cells to the potential plateau region of the positive electrode of the multiple battery cells relative to the reference electrode of the multiple battery cells, and charging and discharging the multiple battery cells to the potential plateau region of the negative electrode of the multiple battery cells relative to the reference electrode of the multiple battery cells, includes: charging and discharging all the multiple battery cells to a third preset state of charge (SOC), and the SOC corresponding to the potential plateau region of the positive electrode of the battery cell relative to the reference electrode of the battery cell and the SOC corresponding to the potential plateau region of the negative electrode of the battery cell relative to the battery cell both include the third preset SOC.

[0030] In the embodiments of the present application, all the multiple battery cells can be charged and discharged to the third preset SOC to adjust the potential plateau region of the positive electrode of the battery cell relative to its reference electrode and the potential plateau region of the negative electrode of the battery cell relative to its reference electrode. In this way, based on the third preset SOC, it is convenient to adjust the battery cell to the potential plateau region of the positive electrode of the battery cell relative to its reference electrode and the potential plateau region of the negative electrode of the battery cell relative to its reference electrode.

[0031] In a second aspect, a detection device for the consistency of reference electrodes is provided. The detection device is applicable to battery cells of a three-electrode system. The battery cell includes a positive electrode, a negative electrode, a reference electrode, and an electrolyte. The detection device includes: a measurement module for measuring the positive electrode potential and / or the negative electrode potential of multiple battery cells. The positive electrode potential of the battery cell is the potential in the potential plateau region of the positive electrode of the battery cell relative to the reference electrode of the battery cell, and the negative electrode potential of the battery cell is the potential in the potential plateau region of the negative electrode of the battery cell relative to the reference electrode of the battery cell respectively. The positive electrodes, negative electrodes, and electrolytes of the multiple battery cells and the settings of the positive electrodes and negative electrodes of the multiple battery cells in the electrolytes of the multiple battery cells are the same; a processing module for performing consistency detection on the reference electrodes of the multiple battery cells according to the measured positive electrode potential and / or negative electrode potential of the multiple battery cells.

[0032] In a possible implementation, the measurement module is used to measure the first positive electrode potential and / or the first negative electrode potential of multiple battery cells after lithium plating of the reference electrodes of the multiple battery cells.

[0033] In a possible implementation, the processing module is used to perform consistency detection on the reference electrodes of multiple battery cells according to the sum of the measured first positive electrode potentials and / or the first negative electrode potentials of the multiple battery cells.

[0034] In a possible implementation, the measurement module is used to measure the second positive electrode potential and / or the second negative electrode potential of multiple battery cells before lithium plating of the reference electrodes of the multiple battery cells.

[0035] In a possible implementation, a processing module is configured to perform consistency detection on the reference electrodes of multiple battery cells according to the measured second positive electrode potentials and / or second negative electrode potentials of the multiple battery cells.

[0036] In a possible implementation, a measurement module is configured to measure the third positive electrode potentials and / or third negative electrode potentials of multiple battery cells after performance testing of the multiple battery cells.

[0037] In a possible implementation, a processing module is configured to perform consistency detection on the reference electrodes of multiple battery cells according to the measured third positive electrode potentials and / or third negative electrode potentials of the multiple battery cells.

[0038] In a possible implementation, a processing module is configured to determine N battery cells as battery cells with consistent reference electrodes among the multiple battery cells according to the differences between the positive electrode potentials and / or the differences between the negative electrode potentials of the multiple battery cells, where the difference between the positive electrode potentials of any two of the N battery cells is less than or equal to a first preset difference, and / or the difference between the negative electrode potentials of any two of the N battery cells is less than or equal to a second preset difference, N≥2 and N is an integer.

[0039] In a possible implementation, the detection device further includes: a charge and discharge module configured to charge and discharge the multiple battery cells to a potential plateau region where the positive electrode of the multiple battery cells is relative to the reference electrode of the multiple battery cells, and / or charge and discharge the multiple battery cells to a potential plateau region where the negative electrode of the multiple battery cells is relative to the reference electrode of the multiple battery cells.

[0040] In a possible implementation, the charge and discharge module is configured to charge and discharge all of the multiple battery cells to a first preset SOC, and the SOC corresponding to the potential plateau region where the positive electrode of the battery cell is relative to the reference electrode of the battery cell includes the first preset SOC.

[0041] In a possible implementation, the charge and discharge module is configured to charge and discharge all of the multiple battery cells to a second preset SOC, and the SOC corresponding to the potential plateau region where the negative electrode of the battery cell is relative to the reference electrode of the battery cell includes the second preset SOC.

[0042] In a possible implementation, the charge and discharge module is configured to charge and discharge all of the multiple battery cells to a third preset SOC, and the SOC corresponding to the potential plateau region where the positive electrode of the battery cell is relative to the reference electrode of the battery cell and the SOC corresponding to the potential plateau region where the negative electrode of the battery cell is relative to the battery cell both include the third preset SOC.

[0043] In a third aspect, a detection device for the consistency of reference electrodes is provided. The detection device includes a memory and a processor. The memory is used to store instructions, and the processor is used to read the instructions and execute the detection method in the first aspect and any possible implementation manner of the first aspect according to the instructions.

[0044] In a fourth aspect, a chip is provided, including: a processor, configured to call and run a computer program from a memory, so that a device installed with the chip executes the detection method in the first aspect and any possible implementation manner of the first aspect.

[0045] In a fifth aspect, a computer program is provided. When the computer program is executed by a computer, the computer is enabled to implement the detection method in the first aspect and any possible implementation manner of the first aspect.

[0046] In a sixth aspect, a computer-readable storage medium is provided. The computer-readable storage medium is used to store a computer program. When the computer program is executed by a computer, the computer is enabled to implement the detection method in the first aspect and any possible implementation manner of the first aspect. Description of the Drawings

[0047] Figure 1 It is a schematic flow chart of the detection method for the consistency of reference electrodes provided by the embodiments of the present application.

[0048] Figure 2 It is another schematic flow chart of the detection method for the consistency of reference electrodes provided by the embodiments of the present application.

[0049] Figure 3 It is another schematic flow chart of the detection method for the consistency of reference electrodes provided by the embodiments of the present application.

[0050] Figure 4 It is yet another schematic flow chart of the detection method for the consistency of reference electrodes provided by the embodiments of the present application.

[0051] Figure 5 It is a schematic flow chart of the process for determining the performance of a battery cell provided by the embodiments of the present application.

[0052] Figure 6 It is another schematic flow chart of the process for determining the performance of a battery cell provided by the embodiments of the present application.

[0053] Figure 7 It is a schematic block diagram of the detection device for the consistency of reference electrodes provided by the embodiments of the present application.

[0054] Figure 8 It is another schematic block diagram of the detection device for the consistency of reference electrodes provided by the embodiments of the present application. Detailed Embodiments

[0055] The following further describes the implementation manners of the present application in conjunction with the accompanying drawings and embodiments. The detailed descriptions and drawings of the following embodiments are used to exemplarily illustrate the principles of the present application, but cannot be used to limit the scope of the present application, that is, the present application is not limited to the described embodiments.

[0056] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality" is more than two, unless otherwise clearly and specifically defined. The terms "including" and "having" and any variations thereof in the specification and claims of the present application and the above description of the drawings are intended to cover non-exclusive inclusion.

[0057] The term "and / or" is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after.

[0058] Referring to "embodiments" in this article means that the specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The appearance of this phrase in various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0059] In the present application, the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "inner", "outer", etc. is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying 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 to the present application. "Vertical" is not strictly vertical, but within the allowable error range. "Parallel" is not strictly parallel, but within the allowable error range.

[0060] The orientation words appearing in the following description are all the directions shown in the figures, and do not limit the specific structure of the present application. In the description of the present application, it should also be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0061] A battery generally refers to a single physical module that includes one or more battery cells to provide a higher voltage and capacity. For example, a battery may include a battery module or a battery pack, etc. Generally, a battery also includes a housing for encapsulating one or more battery cells, and the housing can prevent liquids or other foreign objects from affecting the charging or discharging of the battery cells.

[0062] A battery cell includes an electrode assembly and an electrolyte such as an electrolytic solution. The electrode assembly is composed of a positive electrode sheet, a negative electrode sheet, and a separator. The battery cell mainly operates by the movement of metal ions between the positive electrode sheet and the negative electrode sheet.

[0063] During the electrochemical testing and research of a battery, a three-electrode battery cell is formed by introducing a reference electrode to separate and quantify the potentials of the positive and negative electrodes of multiple battery cells, so as to test the performance of the battery cell. Generally, the higher the consistency of the reference electrode, the higher the consistency of the test data between multiple battery cells, and thus the performance of the battery can be accurately determined.

[0064] Therefore, how to determine the consistency of the reference electrode has become one of the problems to be solved urgently at present.

[0065] Based on the above problems, the embodiments of the present application provide a method and a device for detecting the consistency of a reference electrode. The detection method is applicable to a three-electrode system battery cell, and the battery cell includes a positive electrode, a negative electrode, a reference electrode, and an electrolyte. The detection method includes: measuring the positive electrode potential and / or the negative electrode potential of multiple battery cells. The positive electrode potential of the battery cell is the potential in the potential plateau region of the positive electrode of the battery cell relative to the reference electrode of the battery cell, and the negative electrode potential of the battery cell is the potential in the potential plateau region of the negative electrode of the battery cell relative to the reference electrode of the battery cell respectively. The positive electrodes, negative electrodes, and electrolytes of multiple battery cells, as well as the settings of the positive electrodes and negative electrodes of multiple battery cells in the electrolytes of multiple battery cells, are the same; according to the measured positive electrode potential and / or negative electrode potential of multiple battery cells, the consistency of the reference electrodes of multiple battery cells is detected.

[0066] The method and device for detecting the consistency of the reference electrode provided by the embodiments of the present application can accurately detect the consistency of the reference electrode.

[0067] Figure 1 It is a schematic flow chart of the method for evaluating the consistency of the reference electrode provided by the embodiments of the present application.

[0068] This detection method is applicable to a three-electrode system battery cell, and the battery cell includes a positive electrode, a negative electrode, a reference electrode, and an electrolyte.

[0069] 110. Measure the positive electrode potential and / or the negative electrode potential of multiple battery cells.

[0070] The positive electrode potential of the battery cell is the potential in the potential plateau region of the positive electrode of the battery cell relative to the reference electrode of the battery cell, and the negative electrode potential of the battery cell is the potential in the potential plateau region of the negative electrode of the battery cell relative to the reference electrode of the battery cell.

[0071] The positive electrodes, negative electrodes and electrolytes of multiple battery cells, and the settings of the positive electrodes and negative electrodes of multiple battery cells in the electrolytes of multiple battery cells are the same.

[0072] A battery cell of a three-electrode system refers to introducing a reference electrode into a battery cell with two electrodes including a positive electrode and a negative electrode. The reference electrode can usually be arranged between the positive electrode and the negative electrode of the battery cell.

[0073] The positive electrode, negative electrode and reference electrode of the battery cell are immersed in the electrolyte of the battery cell.

[0074] The potential plateau region of the positive electrode or negative electrode of the battery cell relative to the reference electrode of the battery cell may refer to a stable region of the potential (the potential is within a certain range) that appears on the curve of the positive electrode or negative electrode of the battery cell changing with time or the charge amount of the battery cell such as the state of charge (SOC) of the battery cell, with the potential of the reference electrode of the battery cell as the reference potential during the charge and discharge process.

[0075] As an example, there is a potential plateau region for the positive electrode of the battery cell relative to the reference electrode of the battery cell.

[0076] As an example, the potential plateau region of the positive electrode of the battery cell relative to the reference electrode of the battery cell may include one or more.

[0077] As an example, there is a potential plateau region for the negative electrode of the battery cell relative to the reference electrode of the battery cell.

[0078] As an example, the potential plateau region of the negative electrode of the battery cell relative to the reference electrode of the battery cell may include one or more.

[0079] It should be understood that for the battery cell, only its positive electrode has a potential plateau region relative to its reference electrode, or only its negative electrode has a potential plateau region relative to its reference electrode, or both the positive electrode and the negative electrode of the battery cell have potential plateau regions relative to its reference electrode.

[0080] If there are potential plateau regions relative to their reference electrodes at both the positive and negative electrodes of a battery cell, the charge-discharge times (or the battery cell's charge) corresponding to the unit plateau regions of the positive and negative electrodes of the battery cell compared to their respective reference electrodes can be the same, or partially the same, or different. For example, between the 1st minute and the 4th minute during the charging process is the potential plateau region of the positive electrode of the battery cell relative to its reference electrode; between the 6th minute and the 8th minute during the charging process is the potential plateau region of the negative electrode of the battery cell relative to its reference electrode. Or, between the 3rd minute and the 6th minute during the discharging process is the potential plateau region of the positive electrode of the battery cell relative to its reference electrode; between the 4th minute and the 8th minute during the discharging process is the potential plateau region of the negative electrode of the battery cell relative to its reference electrode. Or, between the 4th minute and the 7th minute during the charging process are the potential plateau regions of the positive electrode of the battery cell and the negative electrode of the battery cell relative to their respective reference electrodes.

[0081] There may be some differences in the preparation process of different reference electrodes, resulting in differences in the morphology, integrity, etc. of the reference electrodes, and thus affecting the consistency of the reference electrodes. For example, the higher the consistency of the morphology, integrity, etc. of multiple reference electrodes, the higher the consistency of these multiple reference electrodes.

[0082] The higher the consistency of multiple reference electrodes, the higher the consistency of the reference potentials (reference voltages) provided by the multiple reference electrodes.

[0083] The consistent setting of the positive and negative electrodes and electrolytes of multiple battery cells, as well as the setting of the positive and negative electrodes of multiple battery cells in the electrolytes of multiple battery cells, can mean that the consistency of the setting of the positive and negative electrodes and electrolytes of multiple battery cells, as well as the setting of the positive and negative electrodes of multiple battery cells in the electrolytes of multiple battery cells, is higher than a preset consistency. As an example, parameters such as the raw materials and preparation processes of the positive electrodes of multiple battery cells are the same, such as the positive electrodes of multiple battery cells being produced in the same batch; parameters such as the raw materials and preparation processes of the negative electrodes of multiple battery cells are the same, such as the negative electrodes of multiple battery cells being produced in the same batch; parameters such as the composition and ratio of the electrolytes of multiple battery cells are the same, such as the electrolytes of multiple battery cells being prepared at the same time; the setting of the positive electrodes of multiple battery cells in the electrolyte, such as the immersion time and immersion depth in the electrolyte, is the same, the setting of the negative electrodes of multiple battery cells in the electrolyte, such as the immersion time and immersion depth in the electrolyte, is the same, and the setting of the reference electrodes of multiple battery cells in the electrolyte, such as the immersion time and immersion depth in the electrolyte, is the same.

[0084] For multiple battery cells with a consistency of the positive electrode, negative electrode, electrolyte, and the settings of the positive electrode, negative electrode, and reference electrode in the electrolyte, etc., that is higher than or equal to a preset consistency (or a difference less than or equal to a preset difference), the higher the consistency of their reference electrodes, the higher the consistency of the test data of the multiple battery cells when using the signals of the positive electrode and / or negative electrode relative to the reference electrode for performance testing of the battery cells. Thus, the performance of the battery cells can be accurately determined based on this highly consistent data.

[0085] For multiple battery cells, if various design parameters such as their positive electrodes, negative electrodes, electrolytes, and the settings of the positive electrode, negative electrode, and reference electrode in the electrolyte are the same (such as the parameters of the raw materials of the positive electrode, negative electrode, and electrolyte and the preparation parameters, as well as the setting parameters of the positive electrode, negative electrode, and reference electrode in the electrolyte), it is generally considered that the consistency of the positive electrode, negative electrode, electrolyte, and the settings of the positive electrode, negative electrode, and reference electrode in the electrolyte, etc., of the multiple battery cells is higher than or equal to the preset consistency.

[0086] 120. Perform consistency detection on the reference electrodes of multiple battery cells according to the measured positive electrode potential and / or negative electrode potential of the multiple battery cells.

[0087] As an example, consistency detection can be performed on the reference electrodes of multiple battery cells according to the difference between the measured positive electrode potentials of the multiple battery cells and / or the difference between the measured negative electrode potentials.

[0088] Generally speaking, the smaller the above difference, the higher the consistency of the reference electrodes of the multiple battery cells.

[0089] As an example, consistency detection can be performed on the reference electrodes of multiple battery cells according to the difference between the measured maximum positive electrode potential and the minimum positive electrode potential of the multiple battery cells, and / or the difference between the measured maximum negative electrode potential and the minimum negative electrode potential of the multiple battery cells.

[0090] For example, for 3 battery cells in the first group, their positive electrode potentials are 2.291V, 2.291V, and 2.293V respectively. For 3 battery cells in the second group, their positive electrode potentials are 2.291V, 2.292V, and 2.298V respectively. The difference between the maximum positive electrode potential and the minimum positive electrode potential of the 3 battery cells in the first group is 0.002V, and the difference between the maximum positive electrode potential and the minimum positive electrode potential of the 3 battery cells in the second group is 0.007V. That is, the difference in the positive electrode potentials of the 3 battery cells in the first group is smaller than the difference in the positive electrode potentials of the 3 battery cells in the second group. Therefore, it can be determined that the consistency of the reference electrodes of the 3 battery cells in the first group is higher than the consistency of the reference electrodes of the 3 battery cells in the second group.

[0091] As an example, if the difference between the positive electrode potentials of multiple measured battery cells pairwise is less than or equal to a first difference, and / or the difference between the negative electrode potentials of multiple measured batteries pairwise is less than or equal to a second difference, it is confirmed that the reference electrodes of the battery cells are consistent.

[0092] In the embodiments of the present application, the consistency of the reference electrodes of multiple battery cells can be detected according to the positive electrode potentials and / or negative electrode potentials of the multiple measured battery cells. Since the potential in the potential plateau region of the positive or negative electrode of a battery cell relative to its reference electrode is relatively stable and has little fluctuation, therefore, by using the positive electrode potential in the potential plateau region of the positive electrode of a battery cell relative to the reference electrode and / or the negative electrode potential in the potential plateau region of the negative electrode of a battery cell relative to its reference electrode, the consistency of the reference electrodes of multiple battery cells can be accurately detected.

[0093] On the other hand, when using multiple battery cells for performance testing, the test platform can be used to measure the positive electrode potentials and / or negative electrode potentials of the multiple battery cells, thereby detecting the consistency of the reference electrodes, and other test components can be avoided, simplifying the design of the detection device for the consistency of the reference electrodes.

[0094] In some embodiments, after lithium plating the reference electrodes of multiple battery cells, the consistency of the reference electrodes of the multiple battery cells can be detected, as will be exemplified below in combination with Figure 2 An exemplary introduction to the method for detecting the consistency of the reference electrodes of multiple battery cells will be given.

[0095] Figure 2 This is the method for detecting the consistency of the reference electrodes of the battery cells provided in the embodiments of the present application. This detection method is applicable to battery cells in a three-electrode system, and the battery cell includes a positive electrode, a negative electrode, a reference electrode, and an electrolyte.

[0096] 210, after lithium plating the reference electrodes of multiple battery cells, measure the first positive electrode potential and / or the first negative electrode potential of the multiple battery cells.

[0097] The positive electrode potential includes the first positive electrode potential, and the negative electrode potential includes the first negative electrode potential.

[0098] The positive electrode potential of a battery cell is the potential in the potential plateau region of the positive electrode of the battery cell relative to the reference electrode of the battery cell, and the negative electrode potential of the battery cell is the potential in the potential plateau region of the negative electrode of the battery cell relative to the reference electrode of the battery cell respectively.

[0099] The positive electrodes, negative electrodes, and electrolytes of multiple battery cells, and the settings of the positive electrodes and negative electrodes of multiple battery cells in the electrolytes of multiple battery cells are the same.

[0100] In this embodiment, the first positive electrode potential refers to the positive electrode potential of the battery cell after the reference electrode is lithium-plated, and the first negative electrode potential refers to the negative electrode potential of the battery cell after the reference electrode is lithium-plated.

[0101] Generally, before the performance test of the battery cell using the reference electrode, the reference electrode is usually lithium-plated.

[0102] The performance test of the battery cell may include at least one of the film-forming reaction test of the battery cell, the cyclic charge-discharge performance test, the rate charge-discharge performance test, the high and low temperature charge-discharge performance test, the lithium deposition test of the battery cell, etc.

[0103] By lithium-plating the reference electrode, it is beneficial to form a dense lithium layer on the surface of the reference electrode, improve the electrochemical stability of the reference electrode, and improve the accuracy of the positive electrode potential and negative electrode potential of the battery cell.

[0104] The lithium-plating process needs to keep the lithium-plating amount, lithium-plating morphology, uniformity, etc. of multiple reference electrodes consistent, so as to achieve the consistency of the reference electrodes. If at least one of the lithium-plating amount, lithium-plating morphology uniformity of multiple reference electrodes is different during the lithium-plating process, it may lead to poor consistency of multiple reference electrodes. Therefore, after the reference electrodes of multiple battery cells are lithium-plated, measure the first positive electrode potential and / or the first negative electrode potential of multiple battery cells to detect the consistency of the reference electrodes of multiple battery cells.

[0105] The content not covered in step 210 can refer to the description in step 110, and this application will not elaborate here.

[0106] In the embodiment of this application, the consistency detection of the reference electrodes of multiple battery cells can be achieved by measuring the positive electrode potential and / or negative electrode potential of multiple battery cells after the reference electrode is lithium-plated.

[0107] 220. According to the sum of the first positive electrode potentials and / or the first negative electrode potentials of the measured multiple battery cells, the consistency of the reference electrodes of multiple battery cells is detected.

[0108] The content of step 220 can refer to the description in step 110, and this application will not elaborate here.

[0109] In the embodiment of this application, the consistency of the reference electrodes of multiple battery cells can be detected according to the positive electrode potential and / or negative electrode potential of multiple battery cells after the reference electrode is lithium-plated, which can accurately detect the consistency of the reference electrodes of multiple battery cells, so as to determine the consistency of the performance test data of multiple battery cells to evaluate the accuracy of the battery cell performance detection.

[0110] In some embodiments, before lithium plating is performed on the reference electrodes of multiple battery cells, the consistency of the reference electrodes of the multiple battery cells can be detected. An exemplary introduction to the method for detecting the consistency of the reference electrodes of multiple battery cells is provided below in combination with Figure 3 the method for detecting the consistency of the reference electrodes of multiple battery cells.

[0111] Figure 3 This is the method for detecting the consistency of the reference electrodes provided by the embodiments of the present application. This detection method is applicable to battery cells in a three-electrode system. The battery cell includes a positive electrode, a negative electrode, a reference electrode, and an electrolyte. 310, before lithium plating is performed on the reference electrodes of multiple battery cells, measure the second positive electrode potential and / or the second negative electrode potential of the multiple battery cells.

[0112] The positive electrode potential includes the second positive electrode potential, and the negative electrode potential includes the second negative electrode potential.

[0113] The positive electrode potential of the battery cell is the potential in the potential plateau region of the positive electrode of the battery cell relative to the reference electrode of the battery cell, and the negative electrode potential of the battery cell is the potential in the potential plateau region of the negative electrode of the battery cell relative to the reference electrode of the battery cell, respectively.

[0114] The positive electrodes, negative electrodes, and electrolytes of the multiple battery cells, and the settings of the positive electrodes and negative electrodes of the multiple battery cells in the electrolytes of the multiple battery cells are the same.

[0115] In this embodiment, the second positive electrode potential refers to the positive electrode potential of the battery cell before lithium plating of the reference electrode, and the second negative electrode potential refers to the negative electrode potential of the battery cell before lithium plating of the reference electrode.

[0116] As an example, a metal wire such as a copper wire can be used as the base material of the reference electrode, and lithium is plated on the surface of the base material. In this case, the reference electrode before lithium plating is the reference electrode including the base material.

[0117] As another example, a metal wire such as a copper wire can be used as the base material of the reference electrode, and the surface of the base material is coated with a coating such as a lithium titanate coating, and then lithium plating is performed on the reference electrode after coating the coating.

[0118] In this case, the reference electrode before lithium plating can be the reference electrode before coating the coating (including the base material), or the reference electrode after coating the coating (including the base material and the coating layer).

[0119] As an example, the positive electrodes of the multiple battery cells and the reference electrodes before lithium plating can be used as the lithium-plated positive electrodes and lithium-plated negative electrodes of the multiple battery cells, respectively, and lithium plating is performed on the references of the multiple battery cells.

[0120] The consistency of the substrate of the reference electrode affects the consistency of the reference electrode. For example, the uniformity, size, etc. of the substrate will affect the consistency of the reference electrode. The consistency of the coating of the reference electrode affects the consistency of the reference electrode. For example, the coating amount, morphology, uniformity, etc. of the coating will affect the consistency of the reference electrode. Therefore, before lithium plating, the consistency of the reference electrode can be detected.

[0121] The uncompleted content of step 220 can refer to the description in step 110, and will not be elaborated herein in this application.

[0122] In the embodiments of this application, the consistency detection of the reference electrodes of multiple battery cells can be achieved by measuring the positive electrode potential and / or negative electrode potential of multiple battery cells before lithium plating of the reference electrodes.

[0123] 320. According to the measured second positive electrode potential and / or second negative electrode potential of multiple battery cells, the consistency detection of the reference electrodes of multiple battery cells is performed.

[0124] The content of step 320 can refer to the description in step 110, and will not be elaborated herein in this application.

[0125] In the embodiments of this application, the consistency detection of the reference electrodes of multiple battery cells can be performed according to the positive electrode potential and / or negative electrode potential of multiple battery cells before lithium plating of the reference electrodes, which can accurately detect the consistency of the reference electrodes of multiple battery cells, so as to determine the consistency of the performance test data of multiple battery cells to evaluate the accuracy of the battery cell performance detection.

[0126] In some embodiments, after the performance tests of multiple battery cells, the consistency detection of the reference electrodes of multiple battery cells can be performed. The following combines Figure 4 An exemplary introduction to the method for detecting the consistency of the reference electrodes of multiple battery cells is given.

[0127] Figure 4 This is the method for detecting the consistency of the reference electrode provided by the embodiments of this application. This detection method is applicable to battery cells in a three-electrode system. The battery cell includes a positive electrode, a negative electrode, a reference electrode, and an electrolyte. 410. After the performance tests of multiple battery cells, measure the third positive electrode potential and / or third negative electrode potential of multiple battery cells.

[0128] The positive electrode potential includes the third positive electrode potential, and the negative electrode potential includes the third negative electrode potential.

[0129] The positive electrode potential of the battery cell is the potential in the potential plateau region of the positive electrode of the battery cell relative to the reference electrode of the battery cell, and the negative electrode potential of the battery cell is the potential in the potential plateau region of the negative electrode of the battery cell relative to the reference electrode of the battery cell respectively.

[0130] The positive electrodes, negative electrodes and electrolytes of multiple battery cells, and the settings of the positive electrodes and negative electrodes of multiple battery cells in the electrolytes of multiple battery cells are the same.

[0131] In this embodiment, the third positive electrode potential refers to the positive electrode potential of the battery cell after performance testing, and the third negative electrode potential refers to the negative electrode potential of the battery cell after performance testing.

[0132] During the performance testing of the battery cell, the reference potential of the reference electrode may shift, thus affecting the consistency of the reference electrodes of multiple battery cells. Therefore, after the performance testing of multiple battery cells, the consistency of the reference electrodes of multiple battery cells can be detected.

[0133] The performance testing of the battery cell may include at least one of the film-forming reaction testing of the battery cell, cyclic charge-discharge performance testing, rate charge-discharge performance testing, high and low temperature charge-discharge performance testing, lithium plating testing of the battery cell, etc.

[0134] In this embodiment, the third positive electrode potential refers to the positive electrode potential of the battery cell after performance testing, and the second negative electrode potential refers to the negative electrode potential of the battery cell after performance testing.

[0135] As an example, after performing a performance test on multiple battery cells, the third positive electrode potential and / or the third negative electrode potential of multiple battery cells can be measured.

[0136] As another example, after performing multiple performance tests on multiple battery cells, the third positive electrode potential and / or the third negative electrode potential of multiple battery cells can be measured.

[0137] For example, after each performance test on multiple battery cells, the third positive electrode potential and / or the third negative electrode potential of multiple battery cells can be measured.

[0138] For the uncompleted content of step 410, reference can be made to the description in step 110, and details are not elaborated herein in this application.

[0139] In the embodiments of this application, the consistency detection of the reference electrodes of multiple battery cells can be achieved through the positive electrode potential and / or the negative electrode potential of multiple battery cells after performance testing.

[0140] 420. According to the measured third positive electrode potential and / or the third negative electrode potential of multiple battery cells, the consistency of the reference electrodes of multiple battery cells is detected.

[0141] For the content of step 420, reference can be made to the description in step 110, and details are not elaborated herein in this application.

[0142] In the embodiments of the present application, the reference electrodes of multiple battery cells can be detected for consistency according to the positive electrode potential and / or negative electrode potential of multiple battery cells after performance testing, so as to accurately detect the consistency of the reference electrodes of multiple battery cells, and thus determine the consistency of the performance test data of multiple battery cells to evaluate the accuracy of battery cell performance detection.

[0143] In some embodiments, N battery cells can be determined as battery cells with consistent reference electrodes among multiple battery cells according to the difference between the positive electrode potentials and / or the difference between the negative electrode potentials of the measured multiple battery cells. As follows, an exemplary introduction is made to the consistency detection method for determining N battery cells as battery cells with consistent reference electrodes. Figure 5 An exemplary introduction is made to the consistency detection method for determining N battery cells as battery cells with consistent reference electrodes.

[0144] Figure 5 It is a schematic flow chart for determining the performance of a battery cell provided by an embodiment of the present application. This process for determining the performance of a battery cell can be applicable to battery cells in a three-electrode system. The battery cell includes a positive electrode, a negative electrode, a reference electrode, and an electrolyte.

[0145] The positive electrode, negative electrode, and reference electrode of the battery cell can be immersed in the electrolyte of the battery cell.

[0146] 510. Measure the positive electrode potential and / or negative electrode potential of multiple battery cells.

[0147] The positive electrode potential of the battery cell is the potential in the potential plateau region of the positive electrode of the battery cell relative to the reference electrode of the battery cell, and the negative electrode potential of the battery cell is the potential in the potential plateau region of the negative electrode of the battery cell relative to the reference electrode of the battery cell respectively.

[0148] The positive electrodes, negative electrodes, and electrolytes of multiple battery cells, and the settings of the positive electrodes and negative electrodes of multiple battery cells in the electrolytes of multiple battery cells are consistent.

[0149] The content of step 510 can refer to the relevant descriptions in steps 110, 210, 310, and 410, and will not be elaborated herein in the present application.

[0150] 520. Determine N battery cells as battery cells with consistent reference electrodes among multiple battery cells according to the difference between the positive electrode potentials and / or the difference between the negative electrode potentials of the measured multiple battery cells.

[0151] Among them, the difference between the positive electrode potentials of any two battery cells among the N battery cells is less than or equal to a first preset difference, and / or the difference between the negative electrode potentials of any two battery cells among the N battery cells is less than or equal to a second preset difference, N≥2 and N is an integer.

[0152] As an example, based on the differences between the measured positive electrode potentials of multiple battery cells, N battery cells among the multiple battery cells can be determined as the battery cells with consistent reference electrodes, where the difference between the positive electrode potentials of any two of the N battery cells is less than or equal to a first preset difference.

[0153] For example, the multiple battery cells include a 1# battery cell, a 2# battery cell, a 3# battery cell, and a 4# battery cell. The positive electrode potentials of these 4 battery cells are 2.291V, 2.291V, 2.293V, and 2.297V respectively, and the first preset difference is 0.003V. Then, the 1# battery cell, the 2# battery cell, and the 3# battery cell among these 4 battery cells can be determined as the battery cells with consistent reference electrodes.

[0154] As another example, the multiple battery cells include a 1# battery cell, a 2# battery cell, a 3# battery cell, and a 4# battery cell. The positive electrode potentials of these 4 battery cells are 2.291V, 2.291V, 2.293V, and 2.297V respectively, and the negative electrode potentials of these 4 battery cells are -1.437V, -1.437V, -1.431V, and -1.474V respectively. Both the first preset difference and the second preset difference are 0.002V. Then, the 1# battery cell and the 2# battery cell among these 4 battery cells can be determined as the battery cells with consistent reference electrodes.

[0155] It should be understood that in this embodiment, the difference between the potentials can be represented by the absolute value of the potential difference.

[0156] In the embodiment of the present application, based on the difference between the positive electrode potentials and / or the difference between the negative electrode potentials of the measured multiple battery cells, N battery cells are determined among the multiple battery cells as the battery cells with consistent reference electrodes. Furthermore, based on the performance test data with high consistency of these N battery cells, the performance of the battery cells can be determined.

[0157] 530. Obtain the performance test data of N battery cells.

[0158] 540. Determine the performance of the battery cells based on the performance test data of N battery cells.

[0159] The higher the consistency of the reference electrodes of the N battery cells, the higher the consistency of the test performance data of the N battery cells.

[0160] Therefore, in the embodiment of the present application, based on the performance test data of the N battery cells with high consistency of the reference electrodes, the performance of the battery cells can be accurately determined.

[0161] In some embodiments, before measuring the second positive electrode potential and / or the second negative electrode potential of a plurality of battery cells, or before measuring the third positive electrode potential and / or the third negative electrode potential of a plurality of battery cells, the plurality of battery cells can be charged and discharged to a potential plateau region of the positive electrode of the plurality of battery cells relative to the reference electrode of the plurality of battery cells, and / or the plurality of battery cells can be charged and discharged to a potential plateau region of the negative electrode of the plurality of battery cells relative to the reference electrode of the plurality of battery cells.

[0162] As an example, before lithium plating the reference electrode of a plurality of battery cells, the plurality of battery cells can be charged and discharged to a potential plateau region of the positive electrode of the plurality of battery cells relative to the reference electrode of the plurality of battery cells, and / or the plurality of battery cells can be charged and discharged to a potential plateau region of the negative electrode of the plurality of battery cells relative to the reference electrode of the plurality of battery cells; then the second positive electrode potential and the second negative electrode potential of the plurality of battery cells are measured.

[0163] As an example, after the performance test of a plurality of battery cells, the plurality of battery cells can be charged and discharged to a potential plateau region of the positive electrode of the plurality of battery cells relative to the reference electrode of the plurality of battery cells, and / or the plurality of battery cells can be charged and discharged to a potential plateau region of the negative electrode of the plurality of battery cells relative to the reference electrode of the plurality of battery cells; then the third positive electrode potential and / or the third negative electrode potential of the plurality of battery cells are measured.

[0164] It should be understood that in the embodiments of the present application, charging and discharging can include charging and / or discharging.

[0165] In the embodiments of the present application, by charging and discharging a plurality of battery cells to a potential plateau region of the positive electrode of the battery cells relative to their reference electrode, and / or by charging and discharging a plurality of battery cells to a potential plateau region of the negative electrode of the battery cells relative to their reference electrode, it is convenient to measure the positive electrode potential and / or the negative electrode potential of the plurality of battery cells, and thus it is convenient to detect the consistency of the reference electrodes of the plurality of battery cells according to the positive electrode potential and / or the negative electrode potential of the plurality of battery cells.

[0166] In some embodiments, all of the plurality of battery cells are charged and discharged to a first preset SOC, and the SOC corresponding to the potential plateau region of the positive electrode of the battery cell relative to the reference electrode of the battery cell includes the first preset SOC.

[0167] The battery cell can be charged to the first preset SOC, so that the battery cell is charged and discharged to a potential plateau region of its positive electrode relative to its reference electrode.

[0168] The first preset SOC can be an SOC value, or it can also be an SOC range.

[0169] That is, the first preset SOC may be an SOC value in the potential plateau region of the positive electrode of the battery cell relative to the reference electrode of the battery cell, or the first preset SOC may be an SOC range in the potential plateau region of the positive electrode of the battery cell relative to the reference electrode of the battery cell.

[0170] If the first preset SOC is a value, then one positive electrode potential of each battery cell among multiple battery cells can be measured when the SOC of each battery cell is at this SOC value, and then the multiple positive electrode potentials corresponding to the multiple battery cells respectively are used as the positive electrode potentials of the multiple battery cells.

[0171] If the first preset SOC is a range, then multiple positive electrode potentials of each battery cell among multiple battery cells can be measured when the SOC of each battery cell is within this SOC range, and then the positive electrode potential of each battery cell is determined according to the multiple positive electrode potentials of each battery cell. For example, the average value of the multiple positive electrode potentials of each battery cell is taken as the positive electrode potential of each battery cell.

[0172] In the embodiments of the present application, multiple battery cells can be charged and discharged to the first preset SOC to adjust the battery cell to the potential plateau region of the positive electrode of the battery cell relative to its reference electrode. In this way, based on the first preset SOC, it is convenient to adjust the battery cell to the potential plateau region of the positive electrode of the battery cell relative to its reference electrode.

[0173] In some embodiments, multiple battery cells are charged and discharged to the first preset SOC, and the SOC corresponding to the potential plateau region of the positive electrode of the battery cell relative to the reference electrode of the battery cell includes the first preset SOC.

[0174] The battery cell can be charged to the second preset SOC, so that the battery cell is charged and discharged to the potential plateau region of its negative electrode relative to its reference electrode.

[0175] The second preset SOC may be an SOC value, or may also be an SOC range.

[0176] That is, the second preset SOC may be an SOC value in the potential plateau region of the negative electrode of the battery cell relative to the reference electrode of the battery cell, or the second preset SOC may be an SOC range in the potential plateau region of the negative electrode of the battery cell relative to the reference electrode of the battery cell.

[0177] If the second preset SOC is a value, then one negative electrode potential of each battery cell among multiple battery cells can be measured when the SOC of each battery cell is at this SOC value, and then the multiple negative electrode potentials corresponding to the multiple battery cells respectively are used as the negative electrode potentials of the multiple battery cells.

[0178] If the second preset SOC is a range, then the negative electrode potentials of each battery cell in a plurality of battery cells can be measured when the SOC of each battery cell is within this SOC range, and then the negative electrode potential of each battery cell can be determined according to the negative electrode potentials of each battery cell. For example, the average value of the negative electrode potentials of each battery cell can be taken as the negative electrode potential of each battery cell.

[0179] In the embodiments of the present application, a plurality of battery cells can be charged and discharged to the second preset SOC, so as to adjust the potential plateau region of the negative electrode of the battery cell relative to its reference electrode. In this way, based on the second preset SOC, it is convenient to adjust the battery cell to the potential plateau region of the negative electrode of the battery cell relative to its reference electrode.

[0180] In some embodiments, a plurality of battery cells are charged and discharged to a third preset SOC, and the SOC corresponding to the potential plateau region of the positive electrode of the battery cell relative to the reference electrode of the battery cell and the SOC corresponding to the potential plateau region of the negative electrode of the battery cell relative to the battery cell both include the third preset SOC.

[0181] The battery cell can be charged to the third preset SOC, so that the battery cell is charged and discharged to the potential plateau region of its negative electrode relative to its reference electrode.

[0182] The third preset SOC can be an SOC value, or it can also be an SOC range.

[0183] That is, the third preset SOC can be an SOC value in the SOC corresponding to the potential plateau region of the positive electrode of the battery cell relative to the reference electrode of the battery cell and an SOC value in the SOC corresponding to the potential plateau region of the negative electrode of the battery cell relative to the reference electrode of the battery cell. Or, the third preset SOC can be an SOC range in the SOC corresponding to the potential plateau region of the positive electrode of the battery cell relative to the reference electrode of the battery cell and an SOC value in the SOC corresponding to the potential plateau region of the negative electrode of the battery cell relative to the reference electrode of the battery cell.

[0184] That is to say, in this embodiment, the SOC corresponding to the potential plateau region of the positive electrode of the battery cell relative to its reference electrode and the SOC corresponding to the potential plateau region of the negative electrode of the battery cell relative to its reference electrode at least partially overlap.

[0185] If the third preset SOC is a value, then the positive electrode potential and the negative electrode potential of each battery cell in a plurality of battery cells can be measured when the SOC of each battery cell is at this SOC value, and then the positive electrode potentials and the negative electrode potentials corresponding to the plurality of battery cells respectively can be used as the positive electrode potential and the negative electrode potential of the plurality of battery cells.

[0186] If the third preset SOC is a range, the SOCs of each of the multiple battery cells can be measured, and when the SOC of each battery cell is within this SOC range, multiple positive electrode potentials and multiple negative electrode potentials of each battery cell can be obtained. Then, based on the multiple positive electrode potentials of each battery cell, the positive electrode potential of each battery cell can be determined, and based on the multiple negative electrode potentials of each battery cell, the negative electrode potential of each battery cell can be determined. For example, the average value of the multiple positive electrode potentials (negative electrode potentials) of each battery cell can be taken as the positive electrode potential (negative electrode potential) of each battery cell.

[0187] In the embodiments of the present application, multiple battery cells can be charged and discharged to the third preset SOC, and the potential plateau regions of the positive electrode of the battery cell relative to its reference electrode and the potential plateau region of the negative electrode of the battery cell relative to its reference electrode can be adjusted. In this way, based on the third preset SOC, it is convenient to adjust the battery cell to the potential plateau region of the positive electrode of the battery cell relative to its reference electrode and the potential plateau region of the negative electrode of the battery cell relative to its reference electrode.

[0188] As an example, during the preparation of the reference electrode and the testing process of the battery cell, the consistency of the reference electrode can be detected at least at one stage before lithium plating, after lithium plating, and after the performance test of the battery cell.

[0189] For example, the consistency of the reference electrode can be detected only after lithium plating (before the performance test after lithium plating). For example, the consistency of the reference electrode can also be detected before lithium plating, after lithium plating, and after the performance test of the battery cell.

[0190] As follows, in combination with Figure 6 An exemplary introduction is given to the method of detecting the consistency of the reference electrode before lithium plating, after lithium plating, and after the performance test of the battery cell.

[0191] Figure 6 This is a schematic flowchart of the process for determining the performance of a battery cell provided by the embodiments of the present application. This process for determining the performance of a battery cell can be applied to a battery cell in a three - electrode system. The battery cell includes a positive electrode, a negative electrode, a reference electrode, and an electrolyte.

[0192] 601, Charge and discharge multiple battery cells to the potential plateau region of the positive electrode of the multiple battery cells relative to the reference electrode of the multiple battery cells, and / or charge and discharge multiple battery cells to the potential plateau region of the negative electrode of the multiple battery cells relative to the reference electrode of the multiple battery cells.

[0193] The positive electrodes, negative electrodes, and electrolytes of the multiple battery cells, and the settings of the positive electrodes and negative electrodes of the multiple battery cells in the electrolytes of the multiple battery cells are the same.

[0194] 602. Measure the second positive electrode potential and / or the second negative electrode potential of multiple battery cells.

[0195] The positive electrode potential of a battery cell is the potential in the potential plateau region of the positive electrode of the battery cell relative to the reference electrode of the battery cell, and the negative electrode potential of the battery cell is the potential in the potential plateau region of the negative electrode of the battery cell relative to the reference electrode of the battery cell respectively.

[0196] In this embodiment, the second positive electrode potential refers to the positive electrode potential of the battery cell before the reference electrode is lithium-plated, and the second negative electrode potential refers to the negative electrode potential of the battery cell before the reference electrode is lithium-plated.

[0197] 603. Perform consistency detection on the reference electrodes of multiple battery cells according to the measured second positive electrode potential and / or the second negative electrode potential of the multiple battery cells.

[0198] As an example, N1 battery cells can be determined from multiple battery cells as battery cells with consistent reference electrodes according to the difference between the positive electrode potentials and / or the difference between the negative electrode potentials of the measured multiple battery cells, where the difference between the positive electrode potentials of any two of the N1 battery cells is less than or equal to a first preset difference, and / or the difference between the negative electrode potentials of any two of the N1 battery cells is less than or equal to a second preset difference, N1≥2 and N1 is an integer.

[0199] 604. Perform lithium plating on multiple battery cells.

[0200] As an example, the positive electrodes of multiple battery cells and the reference electrodes before lithium plating can be used as the lithium-plated positive electrodes and lithium-plated negative electrodes of the multiple battery cells respectively to perform lithium plating on the reference of the multiple battery cells.

[0201] 605. Measure the first positive electrode potential and / or the first negative electrode potential of multiple battery cells.

[0202] In this embodiment, the first positive electrode potential refers to the positive electrode potential of the battery cell after the reference electrode is lithium-plated, and the first negative electrode potential refers to the negative electrode potential of the battery cell after the reference electrode is lithium-plated.

[0203] 606. Perform consistency detection on the reference electrodes of multiple battery cells according to the measured first positive electrode potential and / or the first negative electrode potential of the multiple battery cells.

[0204] As an example, the N1 battery cells determined in step 603 can be used as the multiple battery cells in steps 605 and 606.

[0205] In this way, the differences between the positive electrode potentials and / or the differences between the negative electrode potentials of multiple battery cells can be measured, and N2 battery cells are determined as the battery cells with consistent reference electrodes among the multiple battery cells, where the difference between the positive electrode potentials of any two battery cells among the N2 battery cells is less than or equal to a first preset difference, and / or the difference between the negative electrode potentials of any two battery cells among the N2 battery cells is less than or equal to a second preset difference, N2≥2 and N2 is an integer.

[0206] 607. Perform performance tests on multiple battery cells.

[0207] As an example, the performance test of the battery cell may include at least one of the film-forming reaction test of the battery cell, the cyclic charge-discharge performance test, the rate charge-discharge performance test, the high and low temperature charge-discharge performance test, the lithium plating test of the battery cell, etc.

[0208] 608. Charge and discharge multiple battery cells to the potential plateau region of the positive electrode of the multiple battery cells relative to the reference electrode of the multiple battery cells, and / or charge and discharge multiple battery cells to the potential plateau region of the negative electrode of the multiple battery cells relative to the reference electrode of the multiple battery cells.

[0209] Multiple battery cells usually need to be charged and discharged during the performance test, so that the positive electrode of the multiple battery cells is not in the potential plateau region relative to the reference electrode of the multiple batteries, and / or the negative electrode of the multiple battery cells is not in the plateau region relative to the reference electrode of the multiple battery cells. Therefore, it is necessary to charge and discharge the multiple batteries to adjust the multiple battery cells to the potential plateau region.

[0210] 609. Measure the third positive electrode potential and / or the third negative electrode potential of multiple battery cells.

[0211] In this embodiment, the third positive electrode potential refers to the positive electrode potential of the battery cell after the performance test, and the third negative electrode potential refers to the negative electrode potential of the battery cell after the performance test.

[0212] 610. Perform consistency detection on the reference electrodes of multiple battery cells according to the measured third positive electrode potential and / or the third negative electrode potential of the multiple battery cells.

[0213] As an example, the N2 battery cells determined in step 606 can be used as the multiple battery cells in steps 609 and 610.

[0214] In this way, N3 battery cells can be determined as the battery cells with consistent reference electrodes among multiple battery cells according to the differences between the positive electrode potentials and / or the differences between the negative electrode potentials of the measured multiple battery cells, where the difference between the positive electrode potentials of any two battery cells among the N3 battery cells is less than or equal to a first preset difference, and / or the difference between the negative electrode potentials of any two battery cells among the N3 battery cells is less than or equal to a second preset difference, N3≥2 and N3 is an integer.

[0215] 611. Obtain the data of the performance test of N3 battery cells.

[0216] Determine the performance of the N3 battery cells according to the data of the performance test of the N3 battery cells.

[0217] 612. Determine the performance of the N3 battery cells according to the data of the performance test of the N3 battery cells.

[0218] Figure 6 For other relevant content in each step above, reference can be made to the relevant description in the above text, and this application will not elaborate here.

[0219] It should be understood that in various embodiments of this application, the magnitudes of the serial numbers of the above processes do not mean the sequence of execution. The execution sequence of each process should be determined according to its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of this application.

[0220] The above has described in detail the method for detecting the consistency of the reference electrode in the embodiments of this application. Next, in combination with Figure 7 and Figure 8 the detection device for the consistency of the reference electrode in the embodiments of this application will be described in detail. The technical features described in the method embodiments are applicable to the following device embodiments.

[0221] Figure 7 is a schematic block diagram of the detection device for the consistency of the reference electrode provided in the embodiments of this application. As Figure 7 shown, the detection device 4000 includes the following parts or all of the content.

[0222] The detection device 4000 is applicable to the battery cells of a three - electrode system. The battery cells include a positive electrode, a negative electrode, a reference electrode, and an electrolyte. The detection device 4000 includes: a measurement module 4010 and a processing module 4020.

[0223] A measurement module 4010 is configured to measure the positive electrode potential and / or negative electrode potential of a plurality of battery cells. The positive electrode potential of a battery cell is the potential in the potential plateau region of the positive electrode of the battery cell relative to the reference electrode of the battery cell, and the negative electrode potential of a battery cell is the potential in the potential plateau region of the negative electrode of the battery cell relative to the reference electrode of the battery cell respectively; A processing module 4020 is configured to perform consistency detection on the reference electrodes of the plurality of battery cells according to the measured positive electrode potential and / or negative electrode potential of the plurality of battery cells.

[0224] In some embodiments, the measurement module 4010 is configured to measure the first positive electrode potential and / or the first negative electrode potential of a plurality of battery cells after lithium plating of the reference electrodes of the plurality of battery cells.

[0225] In some embodiments, the processing module 4020 is configured to perform consistency detection on the reference electrodes of the plurality of battery cells according to the sum of the measured first positive electrode potentials and / or the first negative electrode potentials of the plurality of battery cells.

[0226] In some embodiments, the measurement module 4010 is configured to measure the second positive electrode potential and / or the second negative electrode potential of a plurality of battery cells before lithium plating of the reference electrodes of the plurality of battery cells.

[0227] In some embodiments, the processing module 4020 is configured to perform consistency detection on the reference electrodes of the plurality of battery cells according to the measured second positive electrode potential and / or the second negative electrode potential of the plurality of battery cells.

[0228] In some embodiments, the measurement module 4010 is configured to measure the third positive electrode potential and / or the third negative electrode potential of a plurality of battery cells after performance testing of the plurality of battery cells.

[0229] In some embodiments, the processing module 4020 is configured to perform consistency detection on the reference electrodes of the plurality of battery cells according to the measured third positive electrode potential and / or the third negative electrode potential of the plurality of battery cells.

[0230] In some embodiments, the processing module 4020 is configured to determine N battery cells as battery cells with consistent reference electrodes among the plurality of battery cells according to the difference between the positive electrode potentials and / or the difference between the negative electrode potentials of the plurality of battery cells, where the difference between the positive electrode potentials of any two of the N battery cells is less than or equal to a first preset difference, and / or, the difference between the negative electrode potentials of any two of the N battery cells is less than or equal to a second preset difference, N≥2 and N is an integer.

[0231] In some embodiments, the detection device 4000 further includes a charge-discharge module 4030 configured to charge and discharge a plurality of battery cells to a potential plateau region of the positive electrode of the plurality of battery cells relative to the reference electrode of the plurality of battery cells, and / or to charge and discharge the plurality of battery cells to a potential plateau region of the negative electrode of the plurality of battery cells relative to the reference electrode of the plurality of battery cells.

[0232] In some embodiments, the charge-discharge module 4030 is configured to charge and discharge each of the plurality of battery cells to a first preset SOC, and the SOC corresponding to the potential plateau region of the positive electrode of the battery cell relative to the reference electrode of the battery cell includes the first preset SOC.

[0233] In some embodiments, the charge-discharge module 4030 is configured to charge and discharge each of the plurality of battery cells to a second preset SOC, and the SOC corresponding to the potential plateau region of the negative electrode of the battery cell relative to the reference electrode of the battery cell includes the second preset SOC.

[0234] In some embodiments, the charge-discharge module 4030 is configured to charge and discharge each of the plurality of battery cells to a third preset SOC, and the SOC corresponding to the potential plateau region of the positive electrode of the battery cell relative to the reference electrode of the battery cell and the SOC corresponding to the potential plateau region of the negative electrode of the battery cell relative to the battery cell both include the third preset SOC.

[0235] It should be understood that the above and other operations and / or functions of each module in the detection device 4000 for detecting the reference electrode consistency are for implementing the corresponding processes in the respective methods described above. For the sake of brevity, they will not be elaborated here. Figures 1 to 6 For the sake of brevity, they will not be elaborated here.

[0236] Figure 8 FIG. shows a schematic block diagram of a detection device 4000 for a battery system according to an embodiment of the present application. As Figure 8 shown, the detection device 4000 includes a processor 5010 and a memory 5020. Among them, the memory 5020 is used to store instructions, and the processor 5010 is used to read the instructions and execute the methods according to various embodiments of the present application based on the instructions.

[0237] Among them, the memory 5020 can be a separate device independent of the processor 5010, or can be integrated in the processor 5010.

[0238] Optionally, as Figure 8 shown, the detection device 4000 for the battery system may further include a transceiver 5030, and the processor 5010 can control the transceiver 5030 to communicate with other devices. Specifically, it can send information or data to other devices, or receive information or data sent by other devices.

[0239] It should be understood that the processor in the embodiments of the present application may be an integrated circuit chip with signal processing capabilities. In the implementation process, the steps of the above method embodiments can be completed by the integrated logic circuit in the hardware of the processor or instructions in the form of software. The above-mentioned processor may 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, discrete hardware components. It can implement or execute the various methods, steps, and logic block diagrams disclosed in the embodiments of the present application. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc. The steps of the method disclosed in combination with the embodiments of the present application can be directly embodied as being executed and completed by a hardware decoding processor, or executed and completed by a combination of hardware and software modules in the decoding processor. The software module may be located in a mature storage medium in the art such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory, or an electrically erasable programmable memory, a register, etc. This storage medium is located in the memory, and the processor reads the information in the memory and combines its hardware to complete the steps of the above method.

[0240] It can be understood that the memory in the embodiments of the present application can be a volatile memory or a non-volatile memory, or can include both volatile and non-volatile memories. Among them, the non-volatile memory can be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory can be a random access memory (RAM), which is used as an external cache. By way of example but not limitation, many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchlink DRAM (SLDRAM), and direct rambus RAM (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to include but not be limited to these and any other suitable types of memory.

[0241] The embodiments of the present application also provide a computer-readable storage medium for storing a computer program.

[0242] Optionally, the computer-readable storage medium can be applied to the detection device for the consistency of the reference electrode in the embodiments of the present application, and when the computer program runs on a computer, the computer is caused to execute the corresponding processes implemented by the detection device in the various methods of the embodiments of the present application. For the sake of brevity, it will not be elaborated here.

[0243] The embodiments of the present application also provide a computer program product, including computer program instructions.

[0244] Optionally, the computer program product can be applied to the detection device for the consistency of the reference electrode in the embodiments of the present application, and when the computer program instructions run on a computer, the computer is caused to execute the corresponding processes implemented by the detection device in the various methods of the embodiments of the present application. For the sake of brevity, it will not be elaborated here.

[0245] The embodiments of the present application also provide a computer program.

[0246] Optionally, the computer program can be applied to the detection device for the consistency of reference electrodes in the embodiments of the present application. When the computer program runs on a computer, it causes the computer to execute the corresponding processes implemented by the detection device in each method of the embodiments of the present application. For the sake of brevity, it will not be elaborated here.

[0247] Those of ordinary skill in the art can realize that the units and algorithm steps of the examples described in combination with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are executed in a hardware or software manner depends on the specific application and design constraints of the technical solution. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present application.

[0248] Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working processes of the systems, devices, and units described above can refer to the corresponding processes in the foregoing method embodiments and will not be elaborated here.

[0249] In several embodiments provided by the present 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 merely illustrative. For example, the division of the units is only a logical function division, and there can 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. In addition, the couplings, direct couplings, or communication connections between the embodiments of the present application can be through some interfaces, and the indirect couplings or communication connections of the devices or units can be in electrical, mechanical, or other forms.

[0250] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they can be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0251] In addition, the functional units in each embodiment of the present application can be integrated into one processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit.

[0252] When the above-mentioned function 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 such understanding, the technical solution of the present application, in essence, or the part that contributes to the prior art, or a part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of the present application. The aforementioned storage medium includes: various media such as USB flash drives, mobile hard disks, ROM, RAM, magnetic disks, or optical discs that can store program codes.

[0253] Although the present application has been described with reference to the preferred embodiments, various improvements can be made to it and components therein can be replaced with equivalents without departing from the scope of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A method for detecting consistency of a reference electrode, characterized in that: The detection method is applicable to a battery cell of a three-electrode system, wherein the battery cell comprises a positive electrode, a negative electrode, a reference electrode and an electrolyte, and the detection method comprises: Measuring the positive electrode potential and / or negative electrode potential of the plurality of battery cells, wherein the positive electrode potential of the battery cell is the potential of the positive electrode of the battery cell relative to the potential platform area of ​​the reference electrode of the battery cell, and the negative electrode potential of the battery cell is the potential of the negative electrode of the battery cell relative to the potential platform area of ​​the reference electrode of the battery cell, respectively, and the positive electrode, negative electrode and electrolyte in the plurality of battery cells and the positive electrode and negative electrode of the plurality of battery cells in the electrolyte of the plurality of battery cells are arranged in a consistent manner; According to the measured positive electrode potential and / or negative electrode potential of the plurality of battery cells, consistency detection is performed on the reference electrodes of the plurality of battery cells.

2. The detection method according to claim 1, characterized in that: The measuring of the positive electrode potential and / or the negative electrode potential of the plurality of battery cells comprises: After lithium is plated on the reference electrodes of the plurality of battery cells, the first positive electrode potential and / or the first negative electrode potential of the plurality of battery cells are measured.

3. The detection method according to claim 2, characterized in that: The method of performing consistency detection on the reference electrodes of the plurality of battery cells according to the measured positive electrode potentials and / or negative electrode potentials of the plurality of battery cells comprises: According to the measured first positive electrode potentials and / or first negative electrode potentials of the plurality of battery cells, consistency detection is performed on the reference electrodes of the plurality of battery cells.

4. The detection method according to claim 1, characterized in that: The measuring of the positive electrode potential and / or the negative electrode potential of the plurality of battery cells comprises: Before lithium plating is performed on the reference electrodes of the plurality of battery cells, the second positive electrode potential and / or the second negative electrode potential of the plurality of battery cells are measured.

5. The detection method according to claim 4, characterized in that: The method of performing consistency detection on the reference electrodes of the plurality of battery cells according to the measured positive electrode potentials and / or negative electrode potentials of the plurality of battery cells comprises: According to the measured second positive electrode potentials and / or second negative electrode potentials of the plurality of battery cells, consistency detection is performed on the reference electrodes of the plurality of battery cells.

6. The detection method according to claim 1, characterized in that: The measuring of the positive electrode potential and / or the negative electrode potential of the plurality of battery cells comprises: After the performance test is performed on the plurality of battery cells, the third positive electrode potential and / or the third negative electrode potential of the plurality of battery cells are measured.

7. The detection method according to claim 6, characterized in that: The method of performing consistency detection on the reference electrodes of the plurality of battery cells according to the measured positive electrode potentials and / or negative electrode potentials of the plurality of battery cells comprises: According to the measured third positive electrode potentials and / or third negative electrode potentials of the plurality of battery cells, consistency detection is performed on the reference electrodes of the plurality of battery cells.

8. The detection method according to claim 5, characterized in that: The method of performing consistency detection on the reference electrodes of the plurality of battery cells according to the measured positive electrode potentials and / or negative electrode potentials of the plurality of battery cells comprises: According to the difference between the positive electrode potentials and / or the difference between the negative electrode potentials of the plurality of battery cells, N battery cells are determined from the plurality of battery cells as battery cells with consistent reference electrodes, wherein the difference between the positive electrode potentials of any two battery cells among the N battery cells is less than or equal to a first preset difference, and / or the difference between the negative electrode potentials of any two battery cells among the N battery cells is less than or equal to a second preset difference, N≥2 and N is an integer.

9. The detection method according to claim 1, characterized in that: Before measuring the second positive electrode potential and / or the second negative electrode potential of the plurality of battery cells, or before measuring the third positive electrode potential and / or the third negative electrode potential of the plurality of battery cells, the detection method further includes: The plurality of battery cells are charged and discharged until the potential plateau region of the positive electrodes of the plurality of battery cells relative to the reference electrodes of the plurality of battery cells, and / or, the plurality of battery cells are charged and discharged until the potential plateau region of the negative electrodes of the plurality of battery cells relative to the reference electrodes of the plurality of battery cells.

10. The detection method according to claim 9, characterized in that: Charging and discharging the plurality of battery cells to a potential platform region of the positive electrodes of the plurality of battery cells relative to the reference electrodes of the plurality of battery cells comprises: The plurality of battery cells are charged and discharged to a first preset SOC, and the SOC corresponding to the potential platform area of ​​the positive electrode of the battery cell relative to the reference electrode of the battery cell includes the first preset SOC.

11. The detection method according to claim 9 or 10, characterized in that: The method of charging and discharging the plurality of battery cells to a potential platform region of the negative electrodes of the plurality of battery cells relative to the reference electrodes of the plurality of battery cells comprises: The plurality of battery cells are charged and discharged to a second preset SOC, and the SOC corresponding to the potential platform area of ​​the negative electrode of the battery cell relative to the reference electrode of the battery cell includes the second preset SOC.

12. The detection method according to claim 9, characterized in that: The method of charging and discharging the plurality of battery cells to a potential platform area of ​​the positive electrodes of the plurality of battery cells relative to the reference electrodes of the plurality of battery cells, and charging and discharging the plurality of battery cells to a potential platform area of ​​the negative electrodes of the plurality of battery cells relative to the reference electrodes of the plurality of battery cells comprises: The plurality of battery cells are charged and discharged to a third preset SOC, and the SOC corresponding to the potential platform area of ​​the positive electrode of the battery cell relative to the reference electrode of the battery cell and the SOC corresponding to the potential platform area of ​​the negative electrode of the battery cell relative to the battery cell both include the third preset SOC.

13. A device for detecting consistency of a reference electrode, characterized in that: The detection device is applicable to a battery cell of a three-electrode system, wherein the battery cell comprises a positive electrode, a negative electrode, a reference electrode and an electrolyte, and the detection device comprises: A measuring module, used to measure the positive electrode potential and / or negative electrode potential of the plurality of battery cells, wherein the positive electrode potential of the battery cell is the potential of the positive electrode of the battery cell relative to the potential platform area of ​​the reference electrode of the battery cell, and the negative electrode potential of the battery cell is the potential of the negative electrode of the battery cell relative to the potential platform area of ​​the reference electrode of the battery cell, and the positive electrode, negative electrode and electrolyte of the plurality of battery cells and the positive electrode and negative electrode of the plurality of battery cells are arranged consistently in the electrolyte of the plurality of battery cells; The processing module is used to perform consistency detection on the reference electrodes of the plurality of battery cells according to the measured positive electrode potentials and / or negative electrode potentials of the plurality of battery cells.

14. The detection device according to claim 13, characterized in that: The measuring module is used to measure the first positive electrode potential and / or the first negative electrode potential of the plurality of battery cells after lithium is plated on the reference electrodes of the plurality of battery cells.

15. The detection device according to claim 14, characterized in that: The processing module is used to perform consistency detection on the reference electrodes of the plurality of battery cells according to the measured first positive electrode potentials and / or first negative electrode potentials of the plurality of battery cells.

16. The detection device according to claim 13, characterized in that: The measuring module is used to measure the second positive electrode potential and / or the second negative electrode potential of the plurality of battery cells before lithium plating is performed on the reference electrodes of the plurality of battery cells.

17. The detection device according to claim 16, characterized in that: The processing module is used to perform consistency detection on the reference electrodes of the plurality of battery cells according to the measured second positive electrode potentials and / or second negative electrode potentials of the plurality of battery cells.

18. The detection device according to claim 13, characterized in that: The measuring module is used to measure the third positive electrode potential and / or the third negative electrode potential of the plurality of battery cells after the performance test of the plurality of battery cells is performed.

19. The detection device according to claim 18, characterized in that: The processing module is used to perform consistency detection on the reference electrodes of the plurality of battery cells according to the measured third positive electrode potentials and / or third negative electrode potentials of the plurality of battery cells.

20. The detection device according to claim 13, characterized in that: The processing module is used to determine N battery cells among the multiple battery cells as battery cells with consistent reference electrodes based on the difference between the positive electrode potentials and / or the difference between the negative electrode potentials of the multiple battery cells, wherein the difference between the positive electrode potentials of any two battery cells among the N battery cells is less than or equal to a first preset difference, and / or the difference between the negative electrode potentials of any two battery cells among the N battery cells is less than or equal to a second preset difference, and N≥2 and N is an integer.

21. The detection device according to claim 17, characterized in that: The detection device also includes: The charging and discharging module is used to charge and discharge the plurality of battery cells until the potential platform area of ​​the positive electrodes of the plurality of battery cells is relative to the reference electrodes of the plurality of battery cells, and / or to charge and discharge the plurality of battery cells until the potential platform area of ​​the negative electrodes of the plurality of battery cells is relative to the reference electrodes of the plurality of battery cells.

22. The detection device according to claim 21, characterized in that: The charging and discharging module is used to charge and discharge the plurality of battery cells to a first preset SOC, and the SOC corresponding to the potential platform area of ​​the positive electrode of the battery cell relative to the reference electrode of the battery cell includes the first preset SOC.

23. The detection device according to claim 21 or 22, characterized in that: The charging and discharging module is used to charge and discharge the plurality of battery cells to a second preset SOC, and the SOC corresponding to the potential platform area of ​​the negative electrode of the battery cell relative to the reference electrode of the battery cell includes the second preset SOC.

24. The detection device according to claim 21, characterized in that: The charge and discharge module is used to charge and discharge the multiple battery cells to a third preset SOC, and the SOC corresponding to the potential platform area of ​​the positive electrode of the battery cell relative to the reference electrode of the battery cell and the SOC corresponding to the potential platform area of ​​the negative electrode of the battery cell relative to the battery cell both include the third preset SOC.

25. A reference electrode consistency detection device, characterized in that: The detection device comprises a memory and a processor, wherein the memory is used to store instructions, and the processor is used to read the instructions and execute the detection method according to any one of claims 1 to 12 according to the instructions.

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