Detection Method and Detection Device for Consistency of Reference Electrodes

Abstract

The embodiments of the present application provide a method and a device for detecting the consistency of reference electrodes. The detection method is applicable to battery cells of a three-electrode system, and the detection method includes: measuring the positive electrode potential and / or the negative electrode potential of a plurality of battery cells, where the positive electrode potential and the negative electrode potential of the battery cells are the potentials in the potential plateau regions of their positive electrodes and negative electrodes relative to their reference electrodes respectively, and the positive electrodes, negative electrodes and electrolytes of the plurality of battery cells and the settings of the positive electrodes and negative electrodes of the plurality of battery cells in the electrolytes of the plurality of battery cells are the same; performing consistency detection on 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. The method and device for detecting the consistency of reference electrodes provided by the embodiments of the present application can accurately detect the consistency of reference electrodes.

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 cell is formed by introducing a reference electrode to separate and quantify the signals of the positive and negative electrodes of multiple battery cells, so as to determine the performance of the battery cells. Generally, the higher the consistency of the reference electrodes, the higher the consistency of the test data among multiple battery cells, and thus the performance of the battery can be accurately determined.

[0004] Therefore, how to determine the consistency of 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 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 cell in a three-electrode system. 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 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; 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.

[0007] In the embodiments of the present application, consistency detection can be performed 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. Since the potential in the potential plateau region of the positive electrode or the negative electrode of the battery cell relative to its reference electrode is relatively stable and has small fluctuations, the consistency of the reference electrodes of multiple battery cells can be accurately detected by using the positive electrode potential in the potential plateau region of the positive electrode of the battery cell relative to the reference electrode and / or the negative electrode potential in the potential plateau region of the negative electrode of the battery cell relative to its reference electrode.

[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: according to the sum of the measured first positive electrode potentials and / or first negative electrode potentials of multiple battery cells, performing consistency detection on the reference electrodes 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: according to the measured second positive electrode potential and / or second negative electrode potential of multiple battery cells, performing consistency detection on the reference electrodes 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 based on the positive electrode potential and / or negative electrode potential of multiple battery cells before lithium plating of the reference electrode, and the consistency of the reference electrodes of multiple battery cells can be accurately detected, so that 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, and the consistency of the reference electrodes of multiple battery cells can be accurately detected, so that 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 positive electrode potentials and / or the difference between the negative electrode potentials of the measured multiple battery cells are used to determine N battery cells as battery cells with consistent reference electrodes among multiple battery cells, and then the performance of the battery cells can be determined according to the performance test data with relatively high 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 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 charging and discharging 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.

[0024] In the embodiments of the present application, by charging and discharging multiple battery cells to a potential plateau region where the positive electrode of the battery cell is relative to its reference electrode, and / or by charging and discharging multiple battery cells to a potential plateau region where the negative electrode of the battery cell is relative to its reference electrode, it is convenient to measure the positive electrode potential and / or the negative electrode potential of multiple battery cells, and thus it is convenient to detect 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 a potential plateau region where the positive electrode of the multiple battery cells is 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 where the positive electrode of the battery cell is 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 where the positive electrode of the battery cell is 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 where the positive electrode of the battery cell is relative to its reference electrode.

[0027] In a possible implementation, charging and discharging 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 includes: charging and discharging 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.

[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 where the negative electrode of the battery cell is 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 where the negative electrode of the battery cell is 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 on 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 the 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 on 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 based on the measured second positive electrode potential and / or second negative electrode potential of the multiple battery cells.

[0036] In a possible implementation, a measurement module is configured to measure the third positive electrode potential and / or third negative electrode potential 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 based on the measured third positive electrode potential and / or third negative electrode potential of the multiple battery cells.

[0038] In a possible implementation, a processing module is configured to determine N battery cells as the 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 multiple battery cells, where 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.

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

[0040] In a possible implementation, the charge and discharge module is configured to charge and discharge 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.

[0041] In a possible implementation, the charge and discharge module is configured to charge and discharge 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.

[0042] In a possible implementation, the charge and discharge module is configured to charge and discharge multiple 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.

[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 as described 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 as described 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 implements the detection method as described 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 implements the detection method as described in the first aspect and any possible implementation manner of the first aspect. Description of the Drawings

[0047] Figure 1 It is a schematic flowchart of the detection method for the consistency of reference electrodes provided by an embodiment of the present application.

[0048] Figure 2 It is another schematic flowchart of the detection method for the consistency of reference electrodes provided by an embodiment of the present application.

[0049] Figure 3 It is another schematic flowchart of the detection method for the consistency of reference electrodes provided by an embodiment of the present application.

[0050] Figure 4 It is yet another schematic flowchart of the detection method for the consistency of reference electrodes provided by an embodiment of the present application.

[0051] Figure 5 It is a schematic flowchart of the process for determining the performance of a battery cell provided by an embodiment of the present application.

[0052] Figure 6 It is another schematic flowchart of the process for determining the performance of a battery cell provided by an embodiment 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 an embodiment 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 an embodiment of the present application. Detailed Embodiments

[0055] The embodiments of the present application will be further described in detail below in conjunction with the accompanying drawings and examples. The following detailed description of the examples and the drawings are used to exemplarily illustrate the principle 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 specifying 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 specifically defined. The terms "including" and "having" and any variations thereof in the specification, claims and drawings of the present application 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 will 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 of 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 higher voltage and capacity. For example, a battery can include a battery module or a battery pack. Batteries also typically include a casing that encloses the battery cells, preventing liquids or other foreign matter from affecting the charging or discharging of the cells.

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

[0063] During battery electrochemical testing and research, a reference electrode is introduced to form a three-electrode battery cell to separate and quantify the potentials of the positive and negative electrodes of multiple battery cells, thereby testing the performance of the battery cells. Generally, the higher the consistency of the reference electrode, the more consistent the test data between multiple battery cells, allowing for accurate determination of battery performance.

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

[0065] Based on the above problems, an embodiment of the present application provides a method and a device for detecting the consistency of a reference electrode. The detection method is applicable to a battery cell of a three-electrode system, wherein 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 negative electrode potential of multiple battery cells, 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, 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, the positive electrodes, negative electrodes and electrolytes of multiple battery cells and the positive electrodes and negative electrodes of multiple battery cells in the electrolytes of multiple battery cells are arranged consistently; based on the measured positive electrode potential and / or negative electrode potential of multiple battery cells, the reference electrodes of multiple battery cells are detected for consistency.

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

[0067] Figure 1 Schematic diagram of the process of evaluating the consistency of a reference electrode provided in an embodiment of the present application.

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

[0069] 110 , measuring the positive electrode potential and / or negative electrode potential of a plurality of 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] The battery cell of the three-electrode system refers to introducing a reference electrode into the battery cell with two electrodes including a positive electrode and a negative electrode. The reference electrode can usually be set 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 electric quantity 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, which can lead to differences in the morphology, integrity, etc. of the reference electrodes, and thus affect 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 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 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 settings of the positive electrodes of multiple battery cells in the electrolyte, such as the immersion time and immersion depth in the electrolyte, are the same, the settings of the negative electrodes of multiple battery cells in the electrolyte, such as the immersion time and immersion depth in the electrolyte, are the same, and the settings of the reference electrodes of multiple battery cells in the electrolyte, such as the immersion time and immersion depth in the electrolyte, are 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., being higher than or equal to a preset consistency (or a difference being less than or equal to a preset difference), the higher the consistency of the 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 the highly consistent data.

[0085] For multiple battery cells, if various design parameters such as the positive electrode, negative electrode, and electrolyte, and the settings of the positive electrode, negative electrode, and reference electrode in the electrolyte (such as the parameters of the raw materials and preparation parameters of the positive electrode, negative electrode, and electrolyte, and the setting parameters of the positive electrode, negative electrode, and reference electrode in the electrolyte) are the same, it can generally be 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 with positive electrode potentials of 2.291V, 2.291V, and 2.293V respectively, and for 3 battery cells in the second group with positive electrode potentials of 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 less 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 the first difference, and / or the difference between the negative electrode potentials of multiple measured batteries pairwise is less than or equal to the 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 potential and / or the negative electrode potential of the multiple measured battery cells. Since the potential in the potential plateau region of the positive or negative electrode of the battery cell relative to its reference electrode is relatively stable and has small fluctuations, therefore, by using the positive electrode potential in the potential plateau region of the positive electrode of the battery cell relative to the reference electrode and / or the negative electrode potential in the potential plateau region of the negative electrode of the 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 potential and / or the negative electrode potential of the multiple battery cells, so as to detect 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 is performed on the reference electrodes of multiple battery cells, the consistency of the reference electrodes of the multiple battery cells can be detected, as will be exemplarily introduced below in combination with Figure 2 the method for detecting the consistency of the reference electrodes of multiple battery cells.

[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 is performed on 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 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.

[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 electrolyte 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 plated with lithium, and the first negative electrode potential refers to the negative electrode potential of the battery cell after the reference electrode is plated with lithium.

[0101] Typically, before using a reference electrode to perform performance testing on a battery cell, the reference electrode is plated with lithium.

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

[0103] Lithium plating of the reference electrode is beneficial for forming a dense lithium layer on the surface of the reference electrode, thereby improving the electrochemical stability of the reference electrode and improving the accuracy of the positive electrode potential and the negative electrode potential of the battery cell.

[0104] The lithium plating process requires that the amount of lithium plating, the morphology of the lithium plating, and the uniformity of the lithium plating of multiple reference electrodes be maintained consistent, so that the consistency of the reference electrodes can be achieved. If the lithium plating process causes differences in at least one of the amount of lithium plating and the uniformity of the lithium plating morphology of the multiple reference electrodes, the consistency of the multiple reference electrodes may be poor. Therefore, after the reference electrodes of multiple battery cells are lithium plated, the first positive electrode potential and / or the first negative electrode potential of the multiple battery cells are measured to detect the consistency of the reference electrodes of the multiple battery cells.

[0105] For the incomplete contents of step 210, please refer to the description of step 110, and this application will not elaborate on them here.

[0106] In the embodiment 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.

[0107] 220 , performing consistency detection on 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.

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

[0109] In an embodiment of the present application, the reference electrodes of multiple battery cells can be tested for consistency based on the positive electrode potential and / or negative electrode potential of the multiple battery cells after lithium plating. The consistency of the reference electrodes of multiple battery cells can be accurately tested, thereby determining the consistency of the performance test data of multiple battery cells to evaluate the accuracy of the battery cell performance test.

[0110] In some embodiments, before lithium plating the reference electrodes of multiple battery cells, the consistency of the reference electrodes of the multiple battery cells can be detected. The following provides an exemplary introduction to the method for detecting the consistency of the reference electrodes of multiple battery cells. Figure 3 The following provides an exemplary introduction to the method for detecting the consistency of the reference electrodes of multiple battery cells.

[0111] Figure 3 This application provides an embodiment of a method for detecting the consistency of reference electrodes. This detection method is applicable to battery cells in a three-electrode system, and the battery cells include a positive electrode, a negative electrode, a reference electrode, and an electrolyte.

[0112] 310, before lithium plating 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.

[0113] The positive electrode potential includes the second positive electrode potential, and the negative electrode potential includes the second negative electrode potential.

[0114] 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.

[0115] 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.

[0116] In this embodiment, the second positive electrode potential refers to the positive electrode potential of the battery cell before lithium plating the reference electrode, and the second negative electrode potential refers to the negative electrode potential of the battery cell before lithium plating the reference electrode.

[0117] As an example, a metal wire such as a copper wire can be used as the substrate of the reference electrode, and lithium is plated on the surface of the substrate. In this case, the reference electrode before lithium plating is the reference electrode including the substrate.

[0118] As another example, a metal wire such as a copper wire can be used as the substrate of the reference electrode, and a coating such as a lithium titanate coating is coated on the surface of the substrate, and then lithium plating is performed on the reference electrode after coating the coating.

[0119] In this case, the reference electrode before lithium plating can be the reference electrode before coating the coating (including the substrate), or the reference electrode after coating the coating (including the substrate and the coating layer).

[0120] 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 multiple battery cells, respectively, and lithium plating is performed on the references of multiple battery cells.

[0121] The consistency of the substrate of the reference electrode affects the consistency of the reference electrode. For example, the uniformity and size of the substrate will affect the consistency of the reference electrode. The consistency of the coating of the reference electrode also affects the consistency of the reference electrode. For example, the coating amount, morphology, and uniformity of the coating will affect the consistency of the reference electrode. Therefore, before lithium plating, the consistency of the reference electrode can be detected.

[0122] The uncompleted content of step 220 can refer to the description in step 110, and the present application will not elaborate here.

[0123] 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.

[0124] 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.

[0125] The content of step 320 can refer to the description in step 110, and the present application will not elaborate here.

[0126] 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 before lithium plating, which can accurately detect 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 battery cell performance detection.

[0127] 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.

[0128] Figure 4 This is the method for detecting the consistency of the reference electrode 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.

[0129] 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.

[0130] The positive electrode potential includes the third positive electrode potential, and the negative electrode potential includes the third negative electrode potential.

[0131] 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.

[0132] The settings of the positive electrodes, negative electrodes, and electrolytes of multiple battery cells, and the settings of the positive and negative electrodes of multiple battery cells in the electrolytes of multiple battery cells are the same.

[0133] 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.

[0134] 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.

[0135] The performance testing of the battery cell may include at least one of the following: 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.

[0136] 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.

[0137] 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.

[0138] 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.

[0139] 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.

[0140] The uncompleted content of step 410 can refer to the description in step 110, and this application will not elaborate here.

[0141] In the embodiment of this application, the consistency detection of the reference electrodes of multiple battery cells can be achieved by the positive electrode potential and / or the negative electrode potential of multiple battery cells after performance testing.

[0142] 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.

[0143] The content of step 420 can be referred to the description in step 110, and details are not described herein in the present application.

[0144] 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.

[0145] In some embodiments, N battery cells can be determined as 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. As follows, in combination with Figure 5 An exemplary introduction is given to the consistency detection method for determining N battery cells as battery cells with consistent reference electrodes.

[0146] Figure 5 FIG. is a schematic flow chart for determining the performance of a battery cell provided by an embodiment of the present application. The process for determining the performance of a battery cell can be 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.

[0147] The positive electrode, negative electrode, and reference electrode of the battery cell can be immersed in the electrolyte of the battery cell.

[0148] 510. Measure the positive electrode potential and / or negative electrode potential of multiple battery cells.

[0149] 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.

[0150] 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.

[0151] The content of step 510 can be referred to the relevant descriptions in steps 110, 210, 310, and 410, and details are not described herein in the present application.

[0152] 520. Determine N battery cells as 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.

[0153] 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, where N≥2 and N is an integer.

[0154] 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 battery cells with consistent reference electrodes, where the difference between the positive electrode potentials of any two battery cells among the N battery cells is less than or equal to the first preset difference.

[0155] 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 battery cells with consistent reference electrodes.

[0156] For 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 battery cells with consistent reference electrodes.

[0157] It should be understood that in this embodiment, the difference between the potentials can be represented by the absolute value of the potential difference.

[0158] In the embodiment of the present application, by measuring the difference between the positive electrode potentials and / or the difference between the negative electrode potentials of multiple battery cells, N battery cells are determined among the multiple battery cells as battery cells with consistent reference electrodes. Furthermore, based on the performance test data with relatively high consistency of these N battery cells, the performance of the battery cells can be determined.

[0159] 530. Obtain the performance test data of N battery cells.

[0160] 540. Determine the performance of the battery cells according to the performance test data of N battery cells.

[0161] 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.

[0162] Therefore, in the embodiments of the present application, the performance of the battery cells can be accurately determined according to the performance test data of N battery cells with high consistency of the reference electrodes.

[0163] In some embodiments, 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 multiple battery cells can be charged and discharged 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, the multiple battery cells can be charged and discharged to the potential plateau region of the negative electrode of the multiple battery cells relative to the reference electrode of the multiple battery cells.

[0164] As an example, before lithium plating the reference electrodes of multiple battery cells, the multiple battery cells can be charged and discharged 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, the multiple battery cells can be charged and discharged to the potential plateau region of the negative electrode of the multiple battery cells relative to the reference electrode of the multiple battery cells; then the second positive electrode potential and the second negative electrode potential of the multiple battery cells are measured.

[0165] As an example, after the performance test of multiple battery cells, the multiple battery cells can be charged and discharged 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, the multiple battery cells can be charged and discharged to the potential plateau region of the negative electrode of the multiple battery cells relative to the reference electrode of the multiple battery cells; then the third positive electrode potential and / or the third negative electrode potential of the multiple battery cells are measured.

[0166] It should be understood that in the embodiments of the present application, charging and discharging can include charging and / or discharging.

[0167] 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 the multiple battery cells, so as to facilitate detecting the consistency of the reference electrodes of the multiple battery cells according to the positive electrode potential and / or the negative electrode potential of the multiple battery cells.

[0168] In some embodiments, multiple battery cells are all 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.

[0169] The battery cell can be charged to the first preset SOC, so that the battery cell is charged and discharged to the potential plateau region of its positive electrode relative to its reference electrode.

[0170] The first preset SOC can be an SOC value or an SOC range.

[0171] That is, the first preset SOC can be an SOC value within 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, or the first preset SOC can be an SOC range within 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.

[0172] If the first preset SOC is a value, then the positive electrode potential of each battery cell among multiple battery cells can be measured at this SOC value, and then the multiple positive electrode potentials corresponding to the multiple battery cells are used as the positive electrode potentials of the multiple battery cells.

[0173] If the first preset SOC is a range, then the multiple positive electrode potentials of each battery cell among multiple battery cells can be measured at this SOC range, and then the positive electrode potential of each battery cell is determined based on 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.

[0174] 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, 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 based on the first preset SOC.

[0175] In some embodiments, when multiple battery cells are charged and discharged to the first preset SOC, 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.

[0176] 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.

[0177] The second preset SOC can be an SOC value or an SOC range.

[0178] That is, the second preset SOC can be an SOC value within 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 second preset SOC can be an SOC range within 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.

[0179] If the second preset SOC is a numerical value, then the negative electrode potential of each battery cell among multiple battery cells can be measured at this SOC value, and then the multiple negative electrode potentials corresponding to the multiple battery cells are used as the negative electrode potentials of the multiple battery cells.

[0180] If the second preset SOC is a range, then the multiple negative electrode potentials of each battery cell among multiple battery cells can be measured at this SOC range, and then the negative electrode potential of each battery cell is determined according to the multiple negative electrode potentials of each battery cell. For example, the average value of the multiple negative electrode potentials of each battery cell is taken as the negative electrode potential of each battery cell.

[0181] In the embodiment of the present application, multiple battery cells can be charged and discharged to the second preset SOC, and the battery cells are adjusted to the potential plateau region of the negative electrode of the battery cell relative to its reference electrode. In this way, 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 based on the second preset SOC.

[0182] In some embodiments, multiple battery cells are charged and discharged to the 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.

[0183] 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.

[0184] The third preset SOC can be a SOC value, or it can also be a SOC range.

[0185] That is, the third preset SOC can be a 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 a 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 a 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 a 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.

[0186] 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.

[0187] If the third preset SOC is a numerical value, then the positive electrode potential and the negative electrode potential of each battery cell among multiple battery cells can be measured at this SOC value, and then the multiple positive electrode potentials and multiple negative electrode potentials corresponding to the multiple battery cells are used as the positive electrode potential and the negative electrode potential of the multiple battery cells.

[0188] If the third preset SOC is a range, then the multiple positive electrode potentials and multiple negative electrode potentials of each battery cell among multiple battery cells can be measured within this SOC range, and then the positive electrode potential of each battery cell is determined based on the multiple positive electrode potentials of each battery cell and the negative electrode potential of each battery cell is determined based on the multiple negative electrode potentials of each battery cell. For example, the average value of the multiple positive electrode potentials (negative electrode potentials) of each battery cell is taken as the positive electrode potential (negative electrode potential) of each battery cell.

[0189] In the embodiments of the present application, multiple battery cells can be charged and discharged to the third preset SOC, and 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 are 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.

[0190] 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.

[0191] 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.

[0192] 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.

[0193] Figure 6 It 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, and the battery cell includes a positive electrode, a negative electrode, a reference electrode, and an electrolyte.

[0194] 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 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.

[0195] The settings of the positive electrode, negative electrode and electrolyte of the multiple battery cells, and the settings of the positive electrode and negative electrode of the multiple battery cells in the electrolyte of the multiple battery cells are the same.

[0196] 602. Measure the second positive electrode potential and / or the second negative electrode potential of the multiple battery cells.

[0197] 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.

[0198] 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.

[0199] 603. Perform consistency detection on the reference electrodes of the multiple battery cells according to the measured second positive electrode potential and / or second negative electrode potential of the multiple battery cells.

[0200] As an example, N1 battery cells can be determined as battery cells with consistent reference electrodes among the multiple battery cells according to the difference between the measured positive electrode potentials and / or the difference between the measured negative electrode potentials of the 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.

[0201] 604. Lithium-plate the multiple battery cells.

[0202] As an example, the positive electrodes of the multiple battery cells and the reference electrode before lithium plating can be used as the lithium-plated positive electrode and lithium-plated negative electrode of the multiple battery cells, respectively, to lithium-plate the reference of the multiple battery cells.

[0203] 605. Measure the first positive electrode potential and / or the first negative electrode potential of the multiple battery cells.

[0204] 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.

[0205] 606. Detect the consistency of the reference electrodes of multiple battery cells according to the measured first positive electrode potential and / or first negative electrode potential of the multiple battery cells.

[0206] As an example, the N1 battery cells determined in step 603 can be used as the multiple battery cells in steps 605 and 606.

[0207] In this way, the differences between the positive electrode potentials and / or the differences between the negative electrode potentials of the 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. Among them, the difference between the positive electrode potentials of any two of the N2 battery cells is less than or equal to the first preset difference, and / or the difference between the negative electrode potentials of any two of the N2 battery cells is less than or equal to the second preset difference, N2≥2 and N2 is an integer.

[0208] 607. Perform performance tests on multiple battery cells.

[0209] As an example, the performance test of the battery cell can include at least one of the film formation reaction test of the battery cell, the cycle charge and discharge performance test, the rate charge and discharge performance test, the high and low temperature charge and discharge performance test, the lithium plating test of the battery cell, etc.

[0210] 608. Charge and discharge the 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 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.

[0211] When performing performance tests on multiple battery cells, it is usually necessary to charge and discharge, 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.

[0212] 609. Measure the third positive electrode potential and / or third negative electrode potential of the multiple battery cells.

[0213] 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.

[0214] 610. Detect the consistency of the reference electrodes of the multiple battery cells according to the measured third positive electrode potential and / or third negative electrode potential of the multiple battery cells.

[0215] As an example, the N2 battery cells determined in step 606 can be used as the multiple battery cells in steps 609 and 610.

[0216] In this way, N3 battery cells can be determined as the battery cells with consistent reference electrodes among the 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, 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.

[0217] 611. Obtain the data of the performance test of the N3 battery cells.

[0218] Determine the performance of the N3 battery cells according to the data of the performance test of the N3 battery cells.

[0219] 612. Determine the performance of the N3 battery cells according to the data of the performance test of the N3 battery cells.

[0220] Figure 6 For other relevant content in each step above, reference can be made to the relevant descriptions in the above text, and the present application will not elaborate here.

[0221] It should be understood that in various embodiments of the present application, the magnitudes of the sequence numbers of the above processes do not mean the order of execution. The order of execution of each process should be determined by its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

[0222] The above has described in detail the method for detecting the consistency of the reference electrode in the embodiments of the present application. Next, in combination with Figure 7 and Figure 8 the detection device for the consistency of the reference electrode in the embodiments of the present application will be described in detail. The technical features described in the method embodiments are applicable to the following device embodiments.

[0223] Figure 7 is a schematic block diagram of the detection device for the consistency of the reference electrode provided by the embodiments of the present application. As Figure 7 shown, the detection device 4000 includes the following parts or all of the content.

[0224] The detection device 4000 is applicable to 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.

[0225] A measurement module 4010 is configured to measure the positive electrode potential and / or the 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.

[0226] 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.

[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 sum of the measured first positive electrode potentials and / or the first negative electrode potentials of the plurality of battery cells.

[0228] 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.

[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 second positive electrode potential and / or the second negative electrode potential of the plurality of battery cells.

[0230] 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.

[0231] 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.

[0232] 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, 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.

[0233] 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 with respect to the reference electrode of the plurality of battery cells, and / or charge and discharge the plurality of battery cells to a potential plateau region of the negative electrode of the plurality of battery cells with respect to the reference electrode of the plurality of battery cells.

[0234] 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 with respect to the reference electrode of the battery cell includes the first preset SOC.

[0235] 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 with respect to the reference electrode of the battery cell includes the second preset SOC.

[0236] 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 with respect 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 with respect to the battery cell both include the third preset SOC.

[0237] 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, and for the sake of brevity, they will not be elaborated here. Figures 1 to 6 The corresponding processes in the respective methods, for the sake of brevity, will not be elaborated here.

[0238] 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 configured to store instructions, and the processor 5010 is configured to read the instructions and execute the methods according to various embodiments of the present application based on the instructions.

[0239] Among them, the memory 5020 may be a separate device independent of the processor 5010, or may be integrated in the processor 5010.

[0240] Optionally, as Figure 8 shown, the detection device 4000 for the battery system may further include a transceiver 5030, and the processor 5010 may control the transceiver 5030 to communicate with other devices. Specifically, it may send information or data to other devices, or receive information or data sent by other devices.

[0241] 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, each step 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 by the hardware decoding processor, or executed by a combination of the 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.

[0242] 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 is not limited to, these and any other suitable types of memory.

[0243] The embodiments of the present application also provide a computer-readable storage medium for storing a computer program.

[0244] 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, details are not repeated here.

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

[0246] 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, details are not repeated here.

[0247] The embodiments of the present application also provide a computer program.

[0248] 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.

[0249] Those of ordinary skill in the art can realize that the units and algorithm steps of each example 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.

[0250] Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working processes of the above-described systems, devices, and units can refer to the corresponding processes in the foregoing method embodiments, and will not be elaborated here.

[0251] In several embodiments provided in 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 each other involved in 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.

[0252] 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.

[0253] 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.

[0254] When the above-mentioned functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this 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 this application. The aforementioned storage medium includes: various media that can store program codes, such as USB flash drives, mobile hard disks, ROM, RAM, magnetic disks, or optical discs.

[0255] Although this 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 this application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. This 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 detection method for the consistency of reference electrodes, characterized in that, The detection method 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 method includes: Measuring the positive electrode potential and / or the negative electrode potential of a plurality of the 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. 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 in the plurality of battery cells, as well as the settings of the positive and negative electrodes of the plurality of battery cells in the electrolyte of the plurality of battery cells, are the same; Performing 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; The performing 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 includes: Determining 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. Among them, 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, where N≥2 and N is an integer.

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

3. The detection method according to claim 2, wherein, The performing 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 includes: Performing 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.

4. The detection method according to claim 1, wherein The measuring the positive electrode potential and / or the negative electrode potential of the plurality of battery cells includes: Before lithium plating on the reference electrodes of the plurality of battery cells, measuring the second positive electrode potential and / or the second negative electrode potential of the plurality of battery cells.

5. The detection method according to claim 4, wherein The performing 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 includes: Performing 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.

6. The detection method according to claim 1, wherein The measuring the positive electrode potential and / or the negative electrode potential of the plurality of battery cells includes: After performance testing of the plurality of battery cells, measuring the third positive electrode potential and / or the third negative electrode potential of the plurality of battery cells.

7. The detection method according to claim 6, wherein The performing 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 includes: Based on the measured third positive electrode potential and / or third negative electrode potential of multiple battery cells, consistency detection is performed on the reference electrodes of the multiple battery cells.

8. The detection method according to claim 1, characterized in that Before measuring the second positive electrode potential and / or second negative electrode potential of multiple battery cells, or before measuring the third positive electrode potential and / or third negative electrode potential of multiple battery cells, the detection method further includes: Charging and discharging 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 charging and discharging 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.

9. The detection method according to claim 8, wherein Charging and discharging 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 includes: Charging and discharging multiple battery cells to a first preset state of charge (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.

10. The detection method according to claim 8 or 9, characterized in that, Charging and discharging 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 includes: Charging and discharging 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.

11. The detection method according to claim 8, wherein Charging and discharging 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 charging and discharging 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 includes: Charging and discharging 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.

12. A detection device for the consistency of reference electrodes, characterized in that, The detection device 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. The detection device includes: A measurement module for measuring the positive electrode potential and / or negative electrode potential of multiple battery cells. The positive electrode potential of the battery cell is the potential in the potential plateau region where the positive electrode of the battery cell is 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 where the negative electrode of the battery cell is respectively relative to the reference electrode of the battery cell. 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; A processing module for performing consistency detection on the reference electrodes of multiple battery cells according to the measured positive electrode potential and / or negative electrode potential of multiple battery cells; The processing module is specifically 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.

13. The detection device according to claim 12, wherein the measurement module is configured to measure the first positive electrode potential and / or the first negative electrode potential of the multiple battery cells after lithium plating of the reference electrodes of the multiple battery cells.

14. The detection device according to claim 13, wherein the processing module is configured to perform consistency detection on the reference electrodes of the 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.

15. The detection device according to claim 12, wherein the measurement module is configured to measure the second positive electrode potential and / or the second negative electrode potential of the multiple battery cells before lithium plating of the reference electrodes of the multiple battery cells.

16. The detection device according to claim 15, wherein the processing module is configured to perform consistency detection on the reference electrodes of the multiple battery cells according to the measured second positive electrode potentials and / or the second negative electrode potentials of the multiple battery cells.

17. The detection device according to claim 12, wherein the measurement module is configured to measure the third positive electrode potential and / or the third negative electrode potential of the multiple battery cells after performance testing of the multiple battery cells.

18. The detection device according to claim 17, wherein the processing module is configured to perform consistency detection on the reference electrodes of the multiple battery cells according to the measured third positive electrode potentials and / or the third negative electrode potentials of the multiple battery cells.

19. The detection device according to claim 16, wherein 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.

20. The detection device according to claim 19, wherein the charge and discharge module is configured to charge and discharge 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.

21. The detection device according to claim 19 or 20, wherein the charge and discharge module is configured to charge and discharge 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.

22. The detection device according to claim 19, wherein the charge and discharge module is configured to charge and discharge each of the plurality of 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.

23. A detection device for the consistency of reference electrodes, characterized in that, the detection device includes a memory and a processor, the memory is configured to store instructions, and the processor is configured to read the instructions and execute the detection method according to any one of claims 1 to 11 based on the instructions.

Images