Balance potential test method, electronic equipment and storage medium

Abstract

The embodiment of the invention discloses an equilibrium potential test method, electronic equipment and a storage medium, and the method comprises the steps: obtaining the first capacity of a target positive electrode material button battery in the last cycle charging and discharging process at a preset temperature; calculating a first charging capacity and a first discharging capacity according to the first capacity and a first preset proportion; charging the target positive electrode material with the first charging capacity, and obtaining a first charging placement voltage after charging until the target positive electrode material subjected to constant-current charging and discharging is charged to a first upper limit voltage; discharging the target positive electrode material button electricity with the first discharge capacity, and obtaining a first discharge placement voltage after discharging until the target positive electrode material button electricity with the first upper limit voltage is discharged to a first lower limit voltage; and according to the first charging placement voltage and the first discharging placement voltage, determining the equilibrium potential of the buckle electricity of the target positive electrode material. According to the balance potential test scheme provided by the invention, polarization caused by current can be reduced, and the measurement precision of the balance potential is improved.

Description

Technical Field

[0001] The present application relates to the field of new energy technologies, and particularly to a method for testing equilibrium potential, an electronic device, and a storage medium. Background Art

[0002] The equilibrium potential of an electrode is the basis of an electrochemical simulation model, and its accuracy directly affects the accuracy of the model in the unpowered state. Only when the electrode equilibrium potential is accurate, by adjusting the physical and chemical parameters in the electrochemical model (such as the solid-phase diffusion coefficient and reaction rate constant of the electrode material), it is possible to make the calculation results of the model under high-rate currents closer to the actual situation.

[0003] However, when testing the electrode equilibrium potential, the smaller the current rate used in the test, the smaller the polarization, but an extremely small current rate will lead to an overly long test period and possible insufficient accuracy of the test equipment. In addition, even when using a small current rate, there may still be a problem of relatively large polarization in the local SOC (state of charge), which will cause deviations in the basic electrochemical model and thus affect the simulation accuracy. That is, there is a problem that the current equilibrium potential test has poor accuracy, resulting in deviations in the basic electrochemical model. Summary of the Invention

[0004] An embodiment of the present application provides a method for testing equilibrium potential, which can improve the test accuracy of the equilibrium potential and thus avoid deviations in the basic electrochemical model.

[0005] An embodiment of the present application provides a method for testing equilibrium potential, including:

[0006] At a preset temperature, obtain the first capacity of the target positive electrode material coin cell during the last cycle of charge and discharge.

[0007] According to the first capacity and a first preset ratio, calculate the first charging capacity and the first discharging capacity.

[0008] Charge the target positive electrode material coin cell with the first charging capacity and obtain the first charging resting voltage after charging until the target positive electrode material coin cell charged by constant current charge and discharge is charged to a first upper limit voltage.

[0009] Discharge the target positive electrode material coin cell with the first discharging capacity and obtain the first discharging resting voltage after discharge until the target positive electrode material coin cell at the first upper limit voltage is discharged to a first lower limit voltage.

[0010] Determine the equilibrium potential of the target positive electrode material coin cell according to the first charging resting voltage and the first discharging resting voltage.

[0011] Optionally, in some embodiments of the present application, at a preset temperature, the first capacity of the target cathode material coin cell during the last cycle of charge and discharge is obtained;

[0012] According to the first capacity and a first preset ratio, the first charge capacity and the first discharge capacity are calculated;

[0013] The target cathode material coin cell is charged with the first charge capacity, and the first charge rest voltage after charging is obtained until the target cathode material coin cell of constant current charge and discharge is charged to a first upper limit voltage;

[0014] The target cathode material coin cell is discharged with the first discharge capacity, and the first discharge rest voltage after discharge is obtained until the target cathode material coin cell at the first upper limit voltage is discharged to a first lower limit voltage;

[0015] According to the first charge rest voltage and the first discharge rest voltage, the equilibrium potential of the target cathode material coin cell is determined.

[0016] Optionally, in some embodiments of the present application, the obtaining the first charge rest voltage of the target cathode material coin cell placed for a first duration until the target cathode material coin cell of constant current charge and discharge is charged to a first upper limit voltage includes:

[0017] After obtaining the first charge rest voltage of the target cathode material coin cell placed for a first duration, it is detected whether the target cathode material coin cell is charged to the first upper limit voltage;

[0018] If the target cathode material coin cell is not charged to the first upper limit voltage, the target cathode material coin cell is charged with the first charge capacity;

[0019] If the target cathode material coin cell is charged to the first upper limit voltage, the charging is stopped.

[0020] Optionally, in some embodiments of the present application, the discharging the target cathode material coin cell with the first discharge capacity and obtaining the first discharge rest voltage after discharge until the target cathode material coin cell at the first upper limit voltage is discharged to a first lower limit voltage includes:

[0021] The target cathode material coin cell is discharged with the first discharge capacity;

[0022] After each discharge, the target cathode material coin cell is placed for a first duration;

[0023] The first discharge rest voltage of the target cathode material coin cell placed for a first duration is obtained until the target cathode material coin cell at the first upper limit voltage is discharged to a first lower limit voltage.

[0024] Optionally, in some embodiments of the present application, the obtaining of the first discharge placement voltage of the target positive electrode material button cell placed for the first duration until the target positive electrode material button cell with the first upper limit voltage is discharged to the first lower limit voltage includes:

[0025] After obtaining the first discharge placement voltage of the target positive electrode material button cell placed for the first duration, detecting whether the target positive electrode material button cell is discharged to the first lower limit voltage;

[0026] If the target positive electrode material button cell is not discharged to the first lower limit voltage, discharging the target positive electrode material button cell with the first discharge capacity;

[0027] If the target positive electrode material button cell is discharged to the first lower limit voltage, stop discharging.

[0028] Optionally, in some embodiments of the present application, the obtaining of the first capacity of the target positive electrode material button cell in the last cycle of charge and discharge process at a preset temperature includes:

[0029] At the preset temperature, charging the target positive electrode material button cell to the first upper limit voltage;

[0030] Discharging the target positive electrode material button cell charged to the first upper limit voltage to the first lower limit voltage, and returning to execute the step of charging the target positive electrode material button cell to the first upper limit voltage until the number of cycles meets the preset condition;

[0031] Obtaining the first capacity of the target positive electrode material button cell in the last discharge process.

[0032] In a second aspect, the present application provides a method for testing the equilibrium potential, including:

[0033] At the preset temperature, obtaining the second capacity of the target negative electrode material button cell in the last cycle of charge and discharge process;

[0034] Calculating the second charge capacity and the second discharge capacity according to the second capacity and the second preset ratio;

[0035] Charging the target negative electrode material button cell with the second charge capacity and obtaining the second charge placement voltage after charging until the target negative electrode material button cell of constant current charge and discharge is charged to the second upper limit voltage;

[0036] Discharging the target negative electrode material button cell with the second discharge capacity and obtaining the second discharge placement voltage after discharge until the target negative electrode material button cell with the second upper limit voltage is discharged to the second lower limit voltage;

[0037] Determining the equilibrium potential of the target negative electrode material button cell according to the second charge placement voltage and the second discharge placement voltage.

[0038] Optionally, in some embodiments of the present application, charging the target negative electrode material in a discharging state with a second charging capacity and obtaining the second charging rest voltage after charging until the target negative electrode material in constant current charge and discharge is charged to a second upper limit voltage includes:

[0039] Charging the target negative electrode material in a discharging state with a second charging capacity;

[0040] After each charging, resting the target negative electrode material in a discharging state for a second duration;

[0041] Obtaining the second charging rest voltage of the target negative electrode material in a discharging state rested for a second duration until the target negative electrode material in constant current charge and discharge is charged to a second upper limit voltage.

[0042] Optionally, in some embodiments of the present application, obtaining the second charging rest voltage of the target negative electrode material in a discharging state rested for a second duration until the target negative electrode material in constant current charge and discharge is charged to a second upper limit voltage includes:

[0043] After obtaining the second charging rest voltage of the target negative electrode material in a discharging state rested for a second duration, detecting whether the target negative electrode material in a discharging state is charged to the second upper limit voltage;

[0044] If the target negative electrode material in a discharging state is not charged to the second upper limit voltage, charging the target negative electrode material in a discharging state with a second charging capacity;

[0045] If the target negative electrode material in a discharging state is charged to the second upper limit voltage, stopping charging.

[0046] Optionally, in some embodiments of the present application, discharging the target negative electrode material in a discharging state with a second discharging capacity and obtaining the second discharging rest voltage after discharging until the target negative electrode material at the second upper limit voltage is discharged to a second lower limit voltage includes:

[0047] Discharging the target negative electrode material in a discharging state with a second discharging capacity;

[0048] After each discharging, resting the target negative electrode material in a discharging state for a second duration;

[0049] Obtaining the second discharging rest voltage of the target negative electrode material in a discharging state rested for a second duration until the target negative electrode material at the second upper limit voltage is discharged to a second lower limit voltage.

[0050] Optionally, in some embodiments of the present application, the obtaining of the second discharge placement voltage of the target negative electrode material charged and discharged for the second duration until the target negative electrode material charged to the second upper limit voltage is discharged to the second lower limit voltage includes:

[0051] After obtaining the second discharge placement voltage of the target negative electrode material charged and discharged for the second duration, detect whether the target negative electrode material charged and discharged is discharged to the second lower limit voltage;

[0052] If the target negative electrode material charged and discharged is not discharged to the second lower limit voltage, then discharge the target negative electrode material charged and discharged with the second discharge capacity;

[0053] If the target negative electrode material charged and discharged is discharged to the second lower limit voltage, stop discharging.

[0054] Optionally, in some embodiments of the present application, the obtaining of the second capacity of the target negative electrode material charged and discharged in the last cycle charge and discharge process at a preset temperature includes:

[0055] At the preset temperature, charge the target negative electrode material charged and discharged to the first voltage;

[0056] Discharge the target negative electrode material charged to the first voltage to the second voltage, and return to execute the step of charging the target negative electrode material charged and discharged to the first voltage until the number of cycles meets the preset conditions;

[0057] Obtain the second capacity of the target negative electrode material charged and discharged in the last discharge process

[0058] Correspondingly, the present application further provides an electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor. Wherein, when the processor executes the program, it performs the steps of any one of the above-mentioned equilibrium potential testing methods.

[0059] The present application further provides a computer-readable storage medium, where the storage medium stores a computer program, and when the computer program is executed by a processor, it implements the steps of any one of the above-mentioned equilibrium potential testing methods.

[0060] The embodiments of the present application provide a method for testing the equilibrium potential, an electronic device, and a storage medium. At a preset temperature, after obtaining the first capacity of the target cathode material coin cell during the last cycle of charge and discharge, the first charging capacity and the first discharging capacity are calculated according to the first capacity and a first preset ratio. Then, the target cathode material coin cell is charged with the first charging capacity, and the first charging resting voltage after charging is obtained until the target cathode material coin cell under constant current charge and discharge is charged to a first upper limit voltage. Next, the target cathode material coin cell is discharged with the first discharging capacity, and the first discharging resting voltage after discharge is obtained until the target cathode material coin cell at the first upper limit voltage is discharged to a first lower limit voltage. Finally, the equilibrium potential of the target cathode material coin cell is determined according to the first charging resting voltage and the first discharging resting voltage. The equilibrium potential testing scheme provided by the present application can, based on the first resting voltage during the charging process and the first resting voltage during the discharging process of the target cathode material coin cell, determine the equilibrium potential of the target cathode material coin cell. Thus, the polarization caused by the current can be eliminated, the electrode voltage can be closer to the true equilibrium potential, and the simulation accuracy of the electrochemical model can be improved accordingly.

[0061] The embodiments of the present application provide a method for testing the equilibrium potential, an electronic device, and a storage medium. At a preset temperature, after obtaining the second capacity of the target anode material coin cell during the last cycle of charge and discharge, the second charging capacity and the second discharging capacity are calculated according to the second capacity and a second preset ratio. Then, the target anode material coin cell is charged with the second charging capacity, and the second charging resting voltage after charging is obtained until the target anode material coin cell under constant current charge and discharge is charged to a second upper limit voltage. Then, the target anode material coin cell is discharged with the second discharging capacity, and the second discharging resting voltage after discharge is obtained until the target anode material coin cell at the second upper limit voltage is discharged to a second lower limit voltage. Finally, the equilibrium potential of the target anode material coin cell is determined according to the second charging resting voltage and the second discharging resting voltage. The equilibrium potential testing scheme provided by the present application can, based on the second resting voltage during the charging process and the second resting voltage during the discharging process of the target anode material coin cell, determine the equilibrium potential of the target anode material coin cell. Thus, the polarization caused by the current can be eliminated, the electrode voltage can be closer to the true equilibrium potential, and the simulation accuracy of the electrochemical model can be improved accordingly. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative efforts.

[0063] Figure 1 It is a schematic flowchart of the equilibrium potential testing method provided by an embodiment of the present application;

[0064] Figure 2 It is another schematic flowchart of the equilibrium potential testing method provided by an embodiment of the present application

[0065] Figure 3 It is a schematic structural diagram of an electronic device provided by an embodiment of the present application. Detailed implementation manners

[0066] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present application.

[0067] An embodiment of the present application provides an equilibrium potential testing method, an electronic device, and a storage medium.

[0068] Among them, the equilibrium potential testing solution can be specifically applied to a terminal. The terminal can include a tablet computer or a personal computer (PC, Personal Computer). The terminal can establish a wired or wireless connection with a server. The server can include an independently operating server or a distributed server, or can also include a server cluster composed of multiple servers.

[0069] The following will be described in detail respectively. It should be noted that the description order of the following embodiments does not limit the priority order of the embodiments.

[0070] The present application provides an equilibrium potential testing method, including: obtaining a first capacity of a target positive electrode material coin cell during the last cycle of charge and discharge at a preset temperature; calculating a first charge capacity and a first discharge capacity according to the first capacity and a first preset ratio; charging the target positive electrode material coin cell with the first charge capacity and obtaining a first charge resting voltage after charging until the target positive electrode material coin cell with constant current charge and discharge is charged to a first upper limit voltage; discharging the target positive electrode material coin cell with the first discharge capacity and obtaining a first discharge resting voltage after discharge until the target positive electrode material coin cell at the first upper limit voltage is discharged to a first lower limit voltage; determining the equilibrium potential of the target positive electrode material coin cell according to the first charge resting voltage and the first discharge resting voltage.

[0071] Please refer to Figure 1 , Figure 1 It is a schematic flowchart of the equilibrium potential testing method provided by an embodiment of the present application. The specific process of this equilibrium potential testing method can be as follows:

[0072] 101. At a preset temperature, obtain the first capacity of the target cathode material coin cell during the charge-discharge process of the last cycle.

[0073] Through multiple charge-discharge cycles, determine a stable reference capacity C1 (the first capacity). Set the test environment to the preset temperature. Temperature has a significant impact on electrochemical reactions, so testing needs to be carried out at a constant temperature to ensure the repeatability and accuracy of the results. Specifically,

[0074] Perform multiple (usually 3 or more) charge-discharge cycles on the target cathode material coin cell. The purpose of these cycles is to allow the electrode material to reach a stable state and reduce the influence of the instability in the initial state on the test results. During the last charge-discharge cycle, record the discharge capacity. This capacity is denoted as the first capacity C1.

[0075] Multiple charge-discharge cycles can help the electrode material reach a stable state and reduce the instability in the initial state. By performing multiple cycles, measurement errors can be reduced to ensure that the obtained capacity C1 is a reliable reference. The first capacity C1 is the basis for subsequent tests, which is used to calculate the charge and discharge capacities to ensure the accuracy and repeatability of the tests.

[0076] For example, specifically, set the test environment to 25 °C and perform 3 charge-discharge cycles on the cathode material. The charge and discharge currents for each cycle can be set to 0.2C (i.e., 20 mA).

[0077] First cycle: Charge to 4.3 V and discharge to 2.7 V.

[0078] Second cycle: Charge to 4.3 V and discharge to 2.7 V.

[0079] Third cycle: Charge to 4.3 V and discharge to 2.7 V.

[0080] During the third cycle, record the discharge capacity. If the discharge capacity of the third cycle is 95 mAh, then C1 = 95 mAh

[0081] Optionally, in some embodiments of the present application, the step of "at a preset temperature, obtain the first capacity of the target cathode material coin cell during the charge-discharge process of the last cycle" may specifically include:

[0082] At a preset temperature, charge the target cathode material coin cell to the first upper limit voltage;

[0083] Discharge the target cathode material coin cell charged to the first upper limit voltage to the first lower limit voltage, and then return to execute the step of charging the target cathode material coin cell to the first upper limit voltage until the number of cycles meets the preset conditions;

[0084] Obtain the first capacity of the target cathode material coin cell during the last discharge process.

[0085] For example, specifically, set the test environment to a preset temperature (such as 25 °C). Then, charge the target cathode material coin cell with an appropriate charging current (such as 0.2C) until the electrode voltage reaches the first upper limit voltage Umax. Then, discharge the target cathode material coin cell with an appropriate discharge current (such as 0.2C) until the electrode voltage reaches the first lower limit voltage Umin. Repeat the above charging and discharging processes until the number of cycles meets the preset conditions (such as 3 times or more). During the last discharge process, record the discharge capacity, and this capacity is denoted as the first capacity C1.

[0086] 102. Calculate the first charging capacity and the first discharge capacity based on the first capacity and the first preset ratio.

[0087] The first preset ratio is used to determine the capacity of each charge and discharge. It is usually a small value, such as 2% or 5%, to ensure a moderate current rate during the test, thereby reducing the polarization effect and avoiding an overly long test cycle.

[0088] For example, if C1 = 100 mAh and the first preset ratio is 2%, then the charging capacity for each time is 2% × 100 mAh = 2 mAh. Similarly, if C1 = 100 mAh and the first preset ratio is 2%, then the discharge capacity for each time is 2% × 100 mAh = 2 mAh. Through multiple charge-discharge cycles at the preset temperature, obtain the capacity C1 = 100 mAh during the last discharge process.

[0089] 103. Charge the target cathode material coin cell with the first charging capacity and obtain the first charging rest voltage after charging until the target cathode material coin cell for constant current charge-discharge is charged to the first upper limit voltage.

[0090] For example, charge the target cathode material coin cell with the calculated first charging capacity (such as 2 mAh). After each charge, let the electrode stand for a period of time (such as 30 minutes) to enable the electrochemical reaction inside the electrode to reach an equilibrium state. At the end of the standing time after each charge, measure and record the voltage of the electrode, and this voltage is the first charging rest voltage Urest1. Repeat the above steps until the target cathode material coin cell for constant current charge-discharge is charged to the first upper limit voltage Umax1.

[0091] Specifically, the first charging capacity C1 is 100 mAh, the first upper limit voltage Umax1 is 4.3 V, and the charging capacity each time is 2 mAh. The specific steps are as follows: Use a current of 5 mA (0.05C1) to charge 2 mAh each time. After each charge, leave it for 30 minutes, record the first charged and placed voltage Urest1 after charging, and repeat the above charging and leaving steps until the electrode voltage reaches 4.3 V.

[0092] Optionally, in some embodiments of the present application, the step of "charging the target positive electrode material under discharge at the first charging capacity and obtaining the first charged and placed voltage after charging until the target positive electrode material under constant current charge and discharge is charged to the first upper limit voltage" may specifically include:

[0093] Charge the target positive electrode material under discharge at the first charging capacity;

[0094] After each charge, leave the target positive electrode material under discharge for the first duration;

[0095] Obtain the first charged and placed voltage of the target positive electrode material under discharge left for the first duration until the target positive electrode material under constant current charge and discharge is charged to the first upper limit voltage.

[0096] For example, specifically, the first capacity C1 is 100 mAh, the first upper limit voltage Umax is 4.3 V, the charging capacity each time is 2 mAh, the first duration is 30 minutes, use a current of 5 mA (0.05C1), and charge 2 mAh each time. After standing for 30 minutes each time, measure and record the first charged and placed voltage Urest1 of the electrode until the target positive electrode material under constant current charge and discharge is charged to 4.3 V.

[0097] 104. Discharge the target positive electrode material under discharge at the first discharge capacity and obtain the first discharged and placed voltage after discharge until the target positive electrode material at the first upper limit voltage is discharged to the first lower limit voltage.

[0098] For example, if the first capacity C1 is 100 mAh and the first preset ratio is 2%, then the discharge capacity each time is 2 mAh. After each discharge, leave the target positive electrode material under discharge for the first duration. For example, the first duration is 30 minutes, or it can also be 20 minutes, which is specifically set according to the actual situation. The purpose of standing is to make the electrochemical reaction inside the electrode reach an equilibrium state and reduce the influence of polarization. After the end of each standing time, measure and record the voltage of the electrode, and this voltage is called the first discharged and placed voltage Urest2. Repeat the above discharge, standing, and measurement steps until the electrode voltage reaches the first lower limit voltage Umin. For example, if the first lower limit voltage Umin is 2.7 V, then continue to discharge, stand, and measure until the electrode voltage reaches 2.7 V.

[0099] Specifically, the capacity C1 of the target cathode material for coin cell is 100 mAh, the first lower limit voltage Umin is 2.7 V, the discharge capacity each time is 2 mAh, and the first duration is 30 minutes. First, use a current of 5 mA (0.05C1) to discharge 2 mAh each time. After each discharge, let the electrode stand for 30 minutes. After each 30 - minute standing, measure and record the first discharge resting voltage Urest2 of the electrode, and repeat the above steps until the electrode voltage reaches 2.7 V.

[0100] Optionally, in some embodiments of the present application, the step of "discharging the target cathode material for coin cell with the first discharge capacity and obtaining the first discharge resting voltage after discharge until the target cathode material for coin cell with the first upper limit voltage is discharged to the first lower limit voltage" may specifically include:

[0101] Discharge the target cathode material for coin cell with the first discharge capacity;

[0102] After each discharge, let the target cathode material for coin cell stand for the first duration;

[0103] Obtain the first discharge resting voltage of the target cathode material for coin cell standing for the first duration until the target cathode material for coin cell with the first upper limit voltage is discharged to the first lower limit voltage.

[0104] For example, the first capacity C1 is 100 mAh and the first preset ratio is 2%, then the discharge capacity each time is 2 mAh. After each discharge, let the electrode stand (be placed) for a period of time, which is called the first duration. For example, the first duration can be 30 minutes. The purpose of standing is to allow the electrochemical reaction inside the electrode to reach an equilibrium state and reduce the influence of polarization. After the end of each standing time, measure and record the voltage of the electrode, which is called the first discharge resting voltage Urest2, and repeat the above steps of discharging, standing, and measuring until the electrode voltage reaches the first lower limit voltage Umin. For example, if the first lower limit voltage Umin is 2.7 V, then continue discharging, standing, and measuring until the electrode voltage reaches 2.7 V.

[0105] Optionally, in some embodiments of the present application, the step of "obtaining the first discharge resting voltage of the target cathode material for coin cell standing for the first duration until the target cathode material for coin cell with the first upper limit voltage is discharged to the first lower limit voltage" may specifically include:

[0106] After obtaining the first discharge resting voltage of the target cathode material for coin cell standing for the first duration, detect whether the target cathode material for coin cell is discharged to the first lower limit voltage;

[0107] If the target cathode material for coin cell is not discharged to the first lower limit voltage, then discharge the target cathode material for coin cell with the first discharge capacity;

[0108] If the target cathode material coin cell discharges to the first lower limit voltage, stop discharging.

[0109] For example, after each discharge, let the electrode stand for the first period of time (e.g., 30 minutes). After the standing time ends, measure and record the voltage of the electrode, and this voltage is called the first discharge standing voltage Uest2.

[0110] Compare the currently measured voltage Urest2 with the first lower limit voltage Umin. If the current voltage Urest2 has not reached the first lower limit voltage Umin, continue the discharging process. If the current voltage Urest2 has reached the first lower limit voltage Umin, stop the discharging process.

[0111] For example, the first capacity C1 is 100 mAh, the first lower limit voltage Umin is 2.7 V, the discharge capacity per time is 2 mAh, the first period of time is 30 minutes, and discharge the target cathode material coin cell with the first discharge capacity C1: Specifically, use a current of 5 mA (0.05C1) and discharge 2 mAh each time. After standing for 30 minutes each time, measure and record the first discharge standing voltage Urest2 of the electrode. Compare the currently measured voltage Urest2 with the first lower limit voltage Umin. If Urest2 > 2.7 V, continue discharging. If Urest2 = 2.7 V, stop discharging.

[0112] 105. Determine the equilibrium potential of the target cathode material coin cell according to the first charge standing voltage and the first discharge standing voltage.

[0113] For example, calculate the average value U1 of all charge standing voltages Urest1, and calculate the average value U2 of all discharge standing voltages Urest2. Then, take the average value of the average value U1 and the average value U2 as the equilibrium potential E1 of the target cathode material coin cell.

[0114] The embodiment of the present application provides a method for testing the equilibrium potential. At a preset temperature, after obtaining the first capacity of the target cathode material coin cell during the last charge-discharge cycle, the first charging capacity and the first discharging capacity are calculated according to the first capacity and the first preset ratio. Then, the target cathode material coin cell is charged with the first charging capacity, and the first charging resting voltage after charging is obtained until the target cathode material coin cell with constant current charge-discharge is charged to the first upper limit voltage. Next, the target cathode material coin cell is discharged with the first discharging capacity, and the first discharging resting voltage after discharging is obtained until the target cathode material coin cell at the first upper limit voltage is discharged to the first lower limit voltage. Finally, the equilibrium potential of the target cathode material coin cell is determined according to the first charging resting voltage and the first discharging resting voltage. The equilibrium potential testing scheme provided by the present application can determine the equilibrium potential of the target cathode material coin cell according to the first resting voltage during the charging process and the first resting voltage during the discharging process of the target cathode material coin cell. Thus, the polarization caused by the current can be reduced, the electrode voltage can be closer to the true equilibrium potential, and the accuracy of the electrochemical model simulation can be improved accordingly.

[0115] The present application also provides a method for testing the equilibrium potential, including: at a preset temperature, obtaining the second capacity of the target anode material coin cell during the last charge-discharge cycle; calculating the second charging capacity and the second discharging capacity according to the second capacity and the second preset ratio; charging the target anode material coin cell with the second charging capacity, and obtaining the second charging resting voltage after charging until the target anode material coin cell with constant current charge-discharge is charged to the second upper limit voltage; discharging the target anode material coin cell with the second discharging capacity, and obtaining the second discharging resting voltage after discharging until the target anode material coin cell at the second upper limit voltage is discharged to the second lower limit voltage; determining the equilibrium potential of the target anode material coin cell according to the second charging resting voltage and the second discharging resting voltage.

[0116] Please refer to Figure 2 , Figure 2 which is another schematic flow chart of the equilibrium potential testing method provided by the embodiment of the present application. The specific flow of this equilibrium potential testing method can be as follows:

[0117] 201. At a preset temperature, obtain the second capacity of the target anode material coin cell during the last charge-discharge cycle.

[0118] Through multiple charge-discharge cycles, a stable reference capacity C2 (the second capacity) is determined. The test environment is set to the preset temperature, such as 25°C. Temperature has a significant impact on electrochemical reactions, so it is necessary to conduct the test at a constant temperature to ensure the repeatability and accuracy of the results. Specifically,

[0119] Perform multiple (usually 3 or more) charge-discharge cycles on the coin cell of the target anode material. The purpose of these cycles is to allow the electrode material to reach a stable state and reduce the impact of the instability in the initial state on the test results. In the last charge-discharge cycle, record the discharge capacity. This capacity is denoted as the second capacity C2.

[0120] Multiple charge-discharge cycles can help the electrode material reach a stable state and reduce the instability in the initial state. By performing multiple cycles, measurement errors can be reduced to ensure that the obtained second capacity C2 is a reliable benchmark. The second capacity C2 is the basis for subsequent tests and is used to calculate the charge and discharge capacities to ensure the accuracy and repeatability of the tests.

[0121] For example, specifically, set the test environment to 25 °C and perform 3 charge-discharge cycles on the coin cell of the anode material. The charge and discharge currents for each cycle can be set to 0.2C (i.e., 20 mA).

[0122] First cycle: Charge to 2 V and discharge to 0.005 V.

[0123] Second cycle: Charge to 2 V and discharge to 0.005 V.

[0124] Third cycle: Charge to 2 V and discharge to 0.005 V.

[0125] In the third cycle, record the discharge capacity. If the discharge capacity in the third cycle is 95 mAh, then C2 = 95 mAh

[0126] Optionally, in some embodiments of the present application, the step of "obtaining the second capacity of the coin cell of the target anode material during the charge-discharge process of the last cycle at a preset temperature" may specifically include:

[0127] At the preset temperature, charge the coin cell of the target anode material to the first voltage;

[0128] Discharge the coin cell of the target anode material charged to the first voltage to the second voltage, and then return to execute the step of charging the coin cell of the target anode material to the first voltage until the number of cycles meets the preset conditions;

[0129] Obtain the second capacity of the coin cell of the target anode material during the last discharge process.

[0130] For example, specifically, set the test environment to a preset temperature (e.g., 25 °C). Then, charge the coin cell of the target anode material with an appropriate charging current (e.g., 0.2C) until the electrode voltage reaches the first voltage Ua. Next, discharge the coin cell of the target anode material with an appropriate discharging current (e.g., 0.2C) until the electrode voltage reaches the second voltage Ub. Repeat the above charging and discharging processes until the number of cycles meets the preset conditions (e.g., 3 times or more). During the last discharging process, record the discharging capacity, and this capacity is denoted as the second capacity C2.

[0131] 202. Calculate the second charging capacity and the second discharging capacity based on the second capacity and the second preset ratio.

[0132] The second preset ratio is used to determine the capacity of each charging and discharging. It is usually a decimal value, such as 2% or 5%, to ensure a moderate current rate during the test, thereby reducing the polarization effect and avoiding an overly long test cycle.

[0133] For example, if C1 = 100 mAh and the first preset ratio is 2%, then the charging capacity for each time is 2% × 100 mAh = 2 mAh. Similarly, if C2 = 100 mAh and the first preset ratio is 2%, then the discharging capacity for each time is 2% × 100 mAh = 2 mAh.

[0134] 203. Charge the coin cell of the target anode material with the second charging capacity and obtain the second charging resting voltage after charging until the coin cell of the target anode material for constant current charge and discharge is charged to the second upper limit voltage.

[0135] For example, charge the coin cell of the target anode material with the calculated second charging capacity (e.g., 2 mAh). After each charging, let the electrode rest for a period of time (e.g., 30 minutes) to enable the electrochemical reaction inside the electrode to reach an equilibrium state. At the end of the resting time after each charging, measure and record the voltage of the electrode, and this voltage is the second charging resting voltage Urest3. Repeat the above steps until the coin cell of the target anode material for constant current charge and discharge is charged to the second upper limit voltage Umax3.

[0136] Specifically, the second charging capacity C2 is 100 mAh, the second upper limit voltage Umax2 is 2 V, and the charging capacity for each time is 2 mAh. The specific steps are as follows: Use a current of 5 mA (0.05C2) and charge 2 mAh each time. After each charging, set aside for 30 minutes and record the second charging resting voltage Urest3 after charging. Repeat the above charging and setting aside steps until the electrode voltage reaches 2 V.

[0137] Optionally, in some embodiments of the present application, the step of "charging the target negative electrode material with a second charging capacity and obtaining the second charging rest voltage after charging until the target negative electrode material of constant current charge and discharge is charged to a second upper limit voltage" may specifically include:

[0138] Charging the target negative electrode material with a second charging capacity;

[0139] After each charging, leaving the target negative electrode material to rest for a second duration;

[0140] Obtaining the second charging rest voltage of the target negative electrode material left to rest for a second duration until the target negative electrode material of constant current charge and discharge is charged to a second upper limit voltage.

[0141] For example, specifically, the second capacity C1 is 100 mAh, the first upper limit voltage Umax is 2 V, the charging capacity each time is 2 mAh, the second duration is 30 minutes, and a current of 5 mA (0.05C2) is used to charge 2 mAh each time. After leaving to rest for 30 minutes each time, measure and record the second charging rest voltage Urest3 of the electrode until the target positive electrode material of constant current charge and discharge is charged to 2 V.

[0142] 204. Discharging the target negative electrode material with a second discharge capacity and obtaining the second discharge rest voltage after discharge until the target negative electrode material at the second upper limit voltage is discharged to a second lower limit voltage.

[0143] For example, if the second capacity C2 is 100 mAh and the first preset ratio is 2%, then the discharge capacity each time is 2 mAh. After each discharge, leave the target negative electrode material to rest for a second duration. If the first duration is 30 minutes, it can also be 20 minutes, which is specifically set according to the actual situation. The purpose of leaving to rest is to allow the electrochemical reaction inside the electrode to reach an equilibrium state and reduce the influence of polarization. After the end of each rest time, measure and record the voltage of the electrode, and this voltage is called the second discharge rest voltage Urest4. Repeat the above steps of discharging, leaving to rest, and measuring until the electrode voltage reaches the second lower limit voltage Umin2. For example, if the second lower limit voltage Umin2 is 0.005 V, then continue to discharge, leave to rest, and measure until the electrode voltage reaches 0.005 V.

[0144] Specifically, the capacity C2 of the target negative electrode material for coin cell charging and discharging is 100 mAh, the second lower limit voltage Umin2 is 0.005 V, the discharge capacity each time is 2 mAh, and the second duration is 30 minutes. First, use a current of 5 mA (0.05C2) to discharge 2 mAh each time. After each discharge, let the electrode stand for 30 minutes. After each 30 - minute standing, measure and record the second discharge standing voltage Urest4 of the electrode, and repeat the above steps until the electrode voltage reaches 0.005 V.

[0145] Optionally, in some embodiments of the present application, the step of "discharging the target negative electrode material for coin cell charging and discharging with the second discharge capacity and obtaining the second discharge standing voltage after discharging until the target negative electrode material with the second upper limit voltage is discharged to the second lower limit voltage" may specifically include:

[0146] Discharge the target negative electrode material for coin cell charging and discharging with the second discharge capacity;

[0147] After each discharge, let the target positive electrode material for coin cell charging stand for the second duration;

[0148] Obtain the second discharge standing voltage of the target positive electrode material for coin cell charging standing for the second duration until the target negative electrode material with the second upper limit voltage is discharged to the second lower limit voltage.

[0149] For example, the second capacity C2 is 100 mAh and the second preset ratio is 2%, so the discharge capacity each time is 2 mAh. After each discharge, let the electrode stand (be placed) for a period of time, and this time is called the second duration. For example, the second duration can be 30 minutes. The purpose of standing is to allow the electrochemical reaction inside the electrode to reach an equilibrium state and reduce the influence of polarization. After the end of each standing time, measure and record the voltage of the electrode, and this voltage is called the second discharge standing voltage Urest4. Repeat the above steps of discharging, standing, and measuring until the electrode voltage reaches the first lower limit voltage Umin. For example, if the second lower limit voltage Umin is 0.005 V, then continue discharging, standing, and measuring until the electrode voltage reaches 0.005 V.

[0150] Optionally, in some embodiments of the present application, the step of "obtaining the second discharge standing voltage of the target positive electrode material for coin cell charging standing for the second duration until the target negative electrode material with the second upper limit voltage is discharged to the second lower limit voltage" may specifically include:

[0151] After obtaining the second discharge standing voltage of the target negative electrode material for coin cell charging standing for the second duration, detect whether the target negative electrode material for coin cell charging is discharged to the second lower limit voltage;

[0152] If the target negative electrode material for coin cell charging is not discharged to the second lower limit voltage, then discharge the target negative electrode material for coin cell charging with the second discharge capacity;

[0153] If the target anode material is discharged by coin cell to the second lower limit voltage, stop the discharge.

[0154] For example, after each discharge, let the electrode stand for a second duration (e.g., 30 minutes). After the standing time ends, measure and record the voltage of the electrode, which is called the second discharge standing voltage Uest4.

[0155] Compare the currently measured voltage Urest4 with the second lower limit voltage Umin2. If the current voltage Urest4 has not reached the second lower limit voltage Umin2, continue the discharge process. If the current voltage Urest4 has reached the second lower limit voltage Umin2, stop the discharge process.

[0156] For example, the second capacity C2 is 100 mAh, the second lower limit voltage Umin is 0.005 V, the discharge capacity each time is 2 mAh, the second duration is 30 minutes, and discharge the target anode material by coin cell with the second discharge capacity C2: Specifically, use a current of 5 mA (0.05C2) and discharge 2 mAh each time. After standing for 30 minutes each time, measure and record the first discharge standing voltage Urest2 of the electrode. Compare the currently measured voltage Urest2 with the first lower limit voltage Umin. If Urest2 > 0.005 V, continue the discharge. If Urest2 = 0.005 V, stop the discharge.

[0157] 205. Determine the equilibrium potential of the target anode material by coin cell based on the second charge standing voltage and the second discharge standing voltage.

[0158] It should be noted that the equilibrium potentials in the charging direction and the discharging direction of the anode are different. Therefore, the charging equilibrium potential of the target anode material by coin cell is the voltage after charging and standing, and the discharging equilibrium potential of the target anode material by coin cell is the voltage after discharging and standing.

[0159] For example, specifically, charge the target anode material by coin cell with a current of 5 mA (0.05C2), charge 2 mAh each time. After each charge, let the electrode stand for 30 minutes, then measure and record the second charge standing voltage E2 of the electrode; similarly, discharge the target anode material by coin cell with a current of 5 mA (0.05C2). Then, after letting the electrode stand for 30 minutes, measure and record the second discharge standing voltage E3 of the electrode.

[0160] An embodiment of the present application provides a method for testing the equilibrium potential. At a preset temperature, after obtaining the second capacity of the target negative electrode material in the last charge-discharge cycle of the coin cell, the second charging capacity and the second discharging capacity are calculated according to the second capacity and the second preset ratio. Then, the coin cell of the target negative electrode material is charged with the second charging capacity, and the second charging resting voltage after charging is obtained until the coin cell of the target negative electrode material with constant current charge-discharge is charged to the second upper limit voltage. Subsequently, the coin cell of the target negative electrode material is discharged with the second discharging capacity, and the second discharging resting voltage after discharging is obtained until the coin cell of the target negative electrode material at the second upper limit voltage is discharged to the second lower limit voltage. Finally, the equilibrium potential of the coin cell of the target negative electrode material is determined according to the second charging resting voltage and the second discharging resting voltage. The equilibrium potential testing scheme provided by the present application can eliminate the polarization caused by the current according to the second resting voltage during the charging process and the second resting voltage during the discharging process of the coin cell of the target negative electrode material, so that the electrode voltage is closer to the true equilibrium potential, thereby improving the simulation accuracy of the electrochemical model.

[0161] In addition, an embodiment of the present application also provides an electronic device, as Figure 3 shown, which shows a schematic structural diagram of the electronic device involved in the embodiment of the present application. The specific details are as follows:

[0162] The electronic device may include a processor 301 with one or more processing cores, a memory 302 with one or more computer-readable storage media, a power supply 303, an input unit 304 and other components. Those skilled in the art can understand that Figure 3 the structure of the electronic device shown in

[0163] does not limit the electronic device, and may include more or fewer components than shown in the figure, or combine some components, or have different component arrangements. Among them:

[0164] The memory 302 can be used to store software programs and modules. The processor 301 executes various functional applications and balance potential tests by running the software programs and modules stored in the memory 302. The memory 302 mainly includes a program storage area and a data storage area. Among them, the program storage area can store an operating system, application programs required for at least one function (such as a sound playback function, an image playback function, etc.); the data storage area can store data created according to the use of the electronic device. In addition, the memory 302 can include high-speed random access memory, and can also include non-volatile memory, such as at least one magnetic disk storage device, a flash memory device, or other volatile solid-state storage devices. Correspondingly, the memory 302 can also include a memory controller to provide the processor 301 with access to the memory 302.

[0165] The electronic device further includes a power supply 303 for supplying power to each component. Preferably, the power supply 303 can be logically connected to the processor 301 through a power management system, so as to implement functions such as management of charging, discharging, and power consumption management through the power management system. The power supply 303 can also include any components such as one or more DC or AC power supplies, a recharge system, a power failure detection circuit, a power converter or inverter, and a power status indicator.

[0166] The electronic device may further include an input unit 304, which can be used to receive input digital or character information, and generate keyboard, mouse, joystick, optical or trackball signal inputs related to user settings and function controls.

[0167] Although not shown, the electronic device may further include a display unit, etc., which will not be elaborated here. Specifically, in this embodiment, the processor 301 in the electronic device will load the executable files corresponding to the processes of one or more application programs into the memory 302 according to the following instructions, and the processor 301 will run the application programs stored in the memory 302 to implement various functions as follows:

[0168] At a preset temperature, obtain the first capacity of the target positive electrode material coin cell during the last cycle of charge and discharge; calculate the first charge capacity and the first discharge capacity according to the first capacity and the first preset ratio; charge the target positive electrode material coin cell with the first charge capacity and obtain the first charge resting voltage after charging until the target positive electrode material coin cell under constant current charge and discharge is charged to the first upper limit voltage; discharge the target positive electrode material coin cell with the first discharge capacity and obtain the first discharge resting voltage after discharge until the target positive electrode material coin cell at the first upper limit voltage is discharged to the first lower limit voltage; determine the balance potential of the target positive electrode material coin cell according to the first charge resting voltage and the first discharge resting voltage;

[0169] At a preset temperature, obtain the second capacity of the target negative electrode material coin cell during the charge and discharge process of the last cycle; calculate the second charge capacity and the second discharge capacity according to the second capacity and the second preset ratio; charge the target negative electrode material coin cell with the second charge capacity, and obtain the second charge resting voltage after charging until the target negative electrode material coin cell with constant current charge and discharge is charged to the second upper limit voltage; discharge the target negative electrode material coin cell with the second discharge capacity, and obtain the second discharge resting voltage after discharge until the target negative electrode material coin cell at the second upper limit voltage is discharged to the second lower limit voltage; determine the equilibrium potential of the target negative electrode material coin cell according to the second charge resting voltage and the second discharge resting voltage.

[0170] For the specific implementation of each of the above operations, reference may be made to the previous embodiments and will not be elaborated here.

[0171] In the embodiment of the present application, after obtaining the first capacity of the target positive electrode material coin cell during the charge and discharge process of the last cycle at a preset temperature, calculate the first charge capacity and the first discharge capacity according to the first capacity and the first preset ratio, then charge the target positive electrode material coin cell with the first charge capacity, and obtain the first charge resting voltage after charging until the target positive electrode material coin cell with constant current charge and discharge is charged to the first upper limit voltage, then discharge the target positive electrode material coin cell with the first discharge capacity, and obtain the first discharge resting voltage after discharge until the target positive electrode material coin cell at the first upper limit voltage is discharged to the first lower limit voltage, and finally, determine the equilibrium potential of the target positive electrode material coin cell according to the first charge resting voltage and the first discharge resting voltage. The equilibrium potential test scheme provided by the present application can determine the equilibrium potential of the target positive electrode material coin cell according to the first resting voltage during the charging process and the first resting voltage during the discharging process of the target positive electrode material coin cell. Thus, the polarization caused by the current can be reduced, the electrode voltage can be closer to the true equilibrium potential, and the accuracy of the electrochemical model simulation can be improved.

[0172] In an embodiment of the present application, at a preset temperature, after obtaining the second capacity of the target negative electrode material coin cell during the last cycle of charge and discharge, the second charge capacity and the second discharge capacity are calculated according to the second capacity and the second preset ratio. Then, the target negative electrode material coin cell is charged with the second charge capacity, and the second charge resting voltage after charging is obtained until the target negative electrode material coin cell with constant current charge and discharge is charged to the second upper limit voltage. Then, the target negative electrode material coin cell is discharged with the second discharge capacity, and the second discharge resting voltage after discharge is obtained until the target negative electrode material coin cell at the second upper limit voltage is discharged to the second lower limit voltage. Finally, according to the second charge resting voltage and the second discharge resting voltage, the equilibrium potential of the target negative electrode material coin cell is determined. The equilibrium potential test scheme provided by the present application can, according to the second resting voltage during the charging process and the second resting voltage during the discharging process of the target negative electrode material coin cell, determine the equilibrium potential of the target negative electrode material coin cell. Thus, the polarization caused by the current can be eliminated, the electrode voltage can be closer to the true equilibrium potential, and the accuracy of the electrochemical model simulation can be improved accordingly.

[0173] Those of ordinary skill in the art can understand that all or part of the steps in the various methods of the above embodiments can be completed by instructions or by controlling related hardware through instructions. The instructions can be stored in a computer-readable storage medium and loaded and executed by a processor.

[0174] For this reason, an embodiment of the present application provides a storage medium storing multiple instructions that can be loaded by a processor to execute the steps in any of the equilibrium potential test methods provided by the embodiments of the present application. For example, the instructions can execute the following steps:

[0175] At a preset temperature, obtain the first capacity of the target positive electrode material coin cell during the last cycle of charge and discharge; calculate the first charge capacity and the first discharge capacity according to the first capacity and the first preset ratio; charge the target positive electrode material coin cell with the first charge capacity and obtain the first charge resting voltage after charging until the target positive electrode material coin cell with constant current charge and discharge is charged to the first upper limit voltage; discharge the target positive electrode material coin cell with the first discharge capacity and obtain the first discharge resting voltage after discharge until the target positive electrode material coin cell at the first upper limit voltage is discharged to the first lower limit voltage; determine the equilibrium potential of the target positive electrode material coin cell according to the first charge resting voltage and the first discharge resting voltage;

[0176] At a preset temperature, obtain the second capacity of the target negative electrode material coin cell during the charge and discharge process of the last cycle; calculate the second charging capacity and the second discharging capacity according to the second capacity and the second preset ratio; charge the target negative electrode material coin cell with the second charging capacity and obtain the second charging resting voltage after charging until the target negative electrode material coin cell of constant current charge and discharge is charged to the second upper voltage; discharge the target negative electrode material coin cell with the second discharging capacity and obtain the second discharging resting voltage after discharging until the target negative electrode material coin cell of the second upper voltage is discharged to the second lower voltage; determine the equilibrium potential of the target negative electrode material coin cell according to the second charging resting voltage and the second discharging resting voltage.

[0177] For the specific implementation of each of the above operations, reference may be made to the previous embodiments and will not be elaborated herein.

[0178] Among them, the storage medium may include: read only memory (ROM, Read Only Memory), random access memory (RAM, Random Access Memory), magnetic disk or optical disk, etc.

[0179] Since the instructions stored in the storage medium can execute the steps in any of the equilibrium potential testing methods provided in the embodiments of the present application, the beneficial effects achievable by any of the equilibrium potential testing methods provided in the embodiments of the present application can be realized. For details, refer to the previous embodiments and will not be elaborated herein.

[0180] The above has introduced in detail a kind of equilibrium potential testing method, electronic device and storage medium provided by the embodiments of the present application. Specific examples are used herein to elaborate the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application; at the same time, for those skilled in the art, according to the idea of the present application, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present application.

Claims

1. A method for testing the equilibrium potential, characterized in that, Including: At a preset temperature, obtain the first capacity of the target cathode material coin cell during the charge-discharge process of the last cycle; Calculate the first charge capacity and the first discharge capacity according to the first capacity and a first preset ratio; Charge the target cathode material coin cell with the first charge capacity and obtain the first charge resting voltage after charging until the target cathode material coin cell of constant current charge-discharge is charged to a first upper voltage; Discharge the target cathode material coin cell with the first discharge capacity and obtain the first discharge resting voltage after discharging until the target cathode material coin cell at the first upper voltage is discharged to a first lower voltage; Determine the equilibrium potential of the target cathode material coin cell according to the first charge resting voltage and the first discharge resting voltage.

2. The method for testing the equilibrium potential according to claim 1, wherein The charging the target cathode material coin cell with the first charge capacity and obtaining the first charge resting voltage of the target cathode material coin cell after charging until the target cathode material coin cell of constant current charge-discharge is charged to a first upper voltage includes: Charge the target cathode material coin cell with the first charge capacity; After each charge, rest the target cathode material for a first duration; Obtain the first charge resting voltage of the target cathode material coin cell rested for the first duration until the target cathode material coin cell of constant current charge-discharge is charged to a first upper voltage.

3. The method for testing the equilibrium potential according to claim 2, wherein, The obtaining the first charge resting voltage of the target cathode material coin cell rested for the first duration until the target cathode material of constant current charge-discharge is charged to a first upper voltage includes: After obtaining the first charge resting voltage of the target cathode material coin cell rested for the first duration, detect whether the target cathode material coin cell is charged to the first upper voltage; If the target cathode material coin cell is not charged to the first upper voltage, charge the target cathode material coin cell with the first charge capacity; If the target cathode material coin cell is charged to the first upper voltage, stop charging.

4. The method for testing the equilibrium potential according to claim 1, wherein The discharging the target cathode material coin cell with the first discharge capacity and obtaining the first discharge resting voltage after discharging until the target cathode material coin cell at the first upper voltage is discharged to a first lower voltage includes: Discharge the target cathode material coin cell with the first discharge capacity; After each discharge, rest the target cathode material coin cell for the first duration; Obtain the first discharge resting voltage of the target cathode material coin cell rested for the first duration until the target cathode material coin cell at the first upper voltage is discharged to a first lower voltage.

5. The method for testing the equilibrium potential according to claim 4, characterized in that, The obtaining the first discharge resting voltage of the target cathode material coin cell rested for the first duration until the target cathode material coin cell at the first upper voltage is discharged to a first lower voltage includes: After obtaining the first discharge resting voltage of the target cathode material coin cell rested for the first duration, detect whether the target cathode material coin cell is discharged to the first lower voltage; If the target cathode material coin cell is not discharged to the first lower voltage, discharge the target cathode material coin cell with the first discharge capacity; If the target cathode material coin cell is discharged to the first lower voltage, stop discharging.

6. The method for testing the equilibrium potential according to any one of claims 1 to 5, characterized in that At the preset temperature, obtaining a first capacity of the target cathode material coin cell during the charge-discharge process of the last cycle includes: At the preset temperature, charging the target cathode material coin cell to a first upper limit voltage; Discharging the target cathode material coin cell charged to the first upper limit voltage to a first lower limit voltage, and returning to execute the step of charging the target cathode material coin cell to the first upper limit voltage until the number of cycles meets the preset condition; Obtaining the first capacity of the target cathode material coin cell during the last discharge process.

7. A method for testing the equilibrium potential, characterized in that, Including: At the preset temperature, obtaining a second capacity of the target anode material coin cell during the charge-discharge process of the last cycle; Calculating a second charge capacity and a second discharge capacity according to the second capacity and a second preset ratio; Charging the target anode material coin cell with the second charge capacity and obtaining a second charge resting voltage after charging until the target anode material coin cell under constant current charge-discharge is charged to a second upper limit voltage; Discharging the target anode material coin cell with the second discharge capacity and obtaining a second discharge resting voltage after discharge until the target anode material coin cell at the second upper limit voltage is discharged to a second lower limit voltage; Determining the equilibrium potential of the target anode material coin cell according to the second charge resting voltage and the second discharge resting voltage.

8. The method for testing the equilibrium potential according to claim 7, characterized in that, The charging the target anode material coin cell with the second charge capacity and obtaining a second charge resting voltage after charging until the target anode material coin cell under constant current charge-discharge is charged to a second upper limit voltage includes: Charging the target anode material coin cell with the second charge capacity; After each charge, resting the target anode material coin cell for a second duration; Obtaining the second charge resting voltage of the target anode material coin cell rested for the second duration until the target anode material coin cell under constant current charge-discharge is charged to the second upper limit voltage.

9. The method for testing the equilibrium potential according to claim 8, wherein, The obtaining the second charge resting voltage of the target anode material coin cell rested for the second duration until the target anode material coin cell under constant current charge-discharge is charged to the second upper limit voltage includes: After obtaining the second charge resting voltage of the target anode material coin cell rested for the second duration, detecting whether the target anode material coin cell is charged to the second upper limit voltage; If the target anode material coin cell is not charged to the second upper limit voltage, charging the target anode material coin cell with the second charge capacity; If the target anode material coin cell is charged to the second upper limit voltage, stopping the charging.

10. The method for testing the equilibrium potential according to claim 7, wherein The discharging the target anode material coin cell with the second discharge capacity and obtaining a second discharge resting voltage after discharge until the target anode material coin cell at the second upper limit voltage is discharged to a second lower limit voltage includes: Discharging the target anode material coin cell with the second discharge capacity; After each discharge, resting the target anode material coin cell for a second duration; Obtaining the second discharge resting voltage of the target anode material coin cell rested for the second duration until the target anode material coin cell at the second upper limit voltage is discharged to the second lower limit voltage.

11. The method for testing the equilibrium potential according to claim 10, wherein Obtaining the second discharge placement voltage of the target negative electrode material charged and discharged for the second time period until the target negative electrode material charged to the second upper limit voltage is discharged to the second lower limit voltage includes: After obtaining the second discharge placement voltage of the target negative electrode material charged and discharged for the second time period, detecting whether the target negative electrode material charged and discharged is discharged to the second lower limit voltage; If the target negative electrode material charged and discharged is not discharged to the second lower limit voltage, discharging the target negative electrode material charged and discharged with the second discharge capacity; If the target negative electrode material charged and discharged is discharged to the second lower limit voltage, stopping the discharge.

12. The method for testing the equilibrium potential according to any one of claims 7 to 11, characterized in that, Obtaining the second capacity of the target negative electrode material charged and discharged in the last cycle charge-discharge process at a preset temperature includes: At the preset temperature, charging the target negative electrode material charged and discharged to the first voltage; Discharging the target negative electrode material charged to the first voltage to the second voltage, and returning to execute the step of charging the target negative electrode material charged and discharged to the first voltage until the number of cycles meets the preset condition; Obtaining the second capacity of the target negative electrode material charged and discharged in the last discharge process.

13. An electronic device, comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein, When the processor executes the program, the steps of the equilibrium potential testing method according to any one of claims 1-2 are implemented.

14. A computer-readable storage medium, characterized in that, A computer program is stored thereon, wherein when the computer program is executed by a processor, the steps of the equilibrium potential testing method according to any one of claims 1-2 are implemented.

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