Battery cycle test method and device

Abstract

The invention provides a battery cycle test method and device, and the method comprises the steps: executing a first discharge step for a to-be-tested battery corresponding to each test channel according to an initial discharge step parameter, testing the actual discharge capacity of the to-be-tested battery, and testing the actual discharge capacity of the to-be-tested battery according to an initial charge step parameter; executing a first charging step and testing the actual charging capacity of the to-be-tested battery; according to the actual discharge capacity, the initial discharge step parameters are adjusted to obtain adjusted discharge step parameters, and according to the actual charge capacity, the initial charge step parameters are adjusted to obtain adjusted charge step parameters; and executing a second discharging step based on the adjusted discharging step parameter, and executing a second charging step based on the adjusted charging step parameter. According to the embodiment of the invention, the adjusted parameters are more suitable for the current state of the to-be-tested battery according to the adjusted discharging step parameters and the adjusted charging step parameters, so that the service life of the to-be-tested battery is not reduced in the cycle test process.

Description

Technical Field

[0001] The present invention relates to the field of battery technology, and in particular to a battery cycle testing method and device. Background Art

[0002] After the battery is produced, it needs to be tested and verified by a cycle test. The battery cycle life is not only affected by factors such as materials, structure, process, temperature, etc., but also by the cycle step setting parameters such as current, voltage, and power. If the appropriate cycle step parameters are not set during the cycle test, the battery life may be shortened.

[0003] For lithium-ion batteries for power storage, most factories and third-party organizations currently perform constant power charge and discharge cycles of batteries based on standards GB / T36276-2018 or GB / T 36276-2023. In the existing methods, fixed cycle process parameters are used in the cycle. As the number of cycles increases, the number of active lithium ions decreases due to the generation of side reactions and the consumption of electrolyte, and the charge and discharge capacity decreases. Therefore, compared with the initial cycle, the later cycle is higher under the fixed cycle process parameter conditions, which will shorten the battery life. Summary of the invention

[0004] The present invention provides a battery cycle test method and device, the main purpose of which is to set reasonable cycle step parameters during the battery cycle test process to effectively improve the life of the battery.

[0005] In a first aspect, an embodiment of the present invention provides a battery cycle test method, for a battery to be tested corresponding to each test channel, a first discharge step is performed according to an initial discharge step parameter and an actual discharge capacity of the battery to be tested is tested, and a first charge step is performed according to an initial charge step parameter and an actual charge capacity of the battery to be tested is tested;

[0006] According to the actual discharge capacity, the initial discharge step parameters are adjusted to obtain adjusted discharge step parameters; according to the actual charge capacity, the initial charge step parameters are adjusted to obtain adjusted charge step parameters;

[0007] Based on the adjusted discharge step parameters, a second discharge step is performed, and based on the adjusted charge step parameters, a second charge step is performed.

[0008] Furthermore, the step of adjusting the initial discharge step parameters according to the actual discharge capacity to obtain the adjusted discharge step parameters comprises:

[0009] The initial discharge step parameters are adjusted according to the difference between the actual discharge capacity and the first lithium plating risk current.

[0010] Furthermore, the initial discharge step parameters include a discharge current, and the initial discharge step parameters are adjusted according to the size between the actual discharge capacity and the first lithium plating risk current, the steps comprising:

[0011] If the preset proportion of the actual discharge capacity is greater than the first lithium plating risk current, the preset maximum discharge current is used as the discharge current.

[0012] Furthermore, the initial discharge step parameters include a discharge voltage, and the initial discharge step parameters are adjusted according to the size between the actual discharge capacity and the first lithium plating risk current, the steps comprising:

[0013] If a preset proportion of the actual discharge capacity is greater than the first lithium plating risk current, a preset maximum discharge voltage is used as the discharge voltage.

[0014] Further, the step of adjusting the initial charging step parameters according to the actual charging capacity to obtain the adjusted charging step parameters comprises:

[0015] The initial charging step parameters are adjusted according to the difference between the actual charging capacity and the second lithium plating risk current.

[0016] Furthermore, the initial charging step parameters include charging current, and the initial charging step parameters are adjusted according to the difference between the actual charging capacity and the second lithium plating risk current, the steps comprising:

[0017] If the preset proportion of the actual charging capacity is greater than the second lithium plating risk current, the preset maximum charging current is used as the charging current.

[0018] Further, the initial charging step parameters include a charging voltage, and if the preset proportion of the actual charging capacity is greater than the second lithium plating risk current, a preset maximum charging current is used as the charging current, and the steps include:

[0019] If the preset proportion of the actual charging capacity is greater than the second lithium plating risk current, the preset maximum charging voltage is used as the charging voltage.

[0020] Furthermore, the first discharge step is performed according to the initial discharge step parameters, and the steps include:

[0021] After each battery to be tested is left to stand for a preset time, the first discharge step is performed according to the initial discharge step parameters.

[0022] Furthermore, the first charging step is performed according to the initial charging step parameters, and the steps include:

[0023] After each battery to be tested is left to stand for a preset time, the first charging step is performed according to the initial charging step parameters.

[0024] In a second aspect, an embodiment of the present invention provides a battery cycle testing device, comprising:

[0025] A measuring module, for executing a first discharging step and testing an actual discharge capacity of the battery to be tested according to an initial discharging step parameter for the battery to be tested corresponding to each test channel, and executing a first charging step and testing an actual charging capacity of the battery to be tested according to an initial charging step parameter;

[0026] An adjustment module, configured to adjust the initial discharge step parameters according to the actual discharge capacity to obtain adjusted discharge step parameters, and to adjust the initial charge step parameters according to the actual charge capacity to obtain adjusted charge step parameters;

[0027] The optimization module is used to execute the second discharge step based on the adjusted discharge step parameters, and to execute the second charge step based on the adjusted charge step parameters.

[0028] The present invention proposes a battery cycle test method and device. When each test channel performs a cycle test on a battery to be tested, the first discharge step is first executed according to the initial discharge step parameters, and the first charging step is executed according to the initial charging step parameters, and during the execution process, the actual discharge capacity and the actual charging capacity of the battery to be tested are tested; then, according to the actual discharge capacity and the actual charging capacity, the initial discharge step parameters and the initial charging step parameters are adjusted; finally, according to the adjusted discharge step parameters and the adjusted charging step parameters, the adjusted parameters are made more suitable for the current state of the battery to be tested, so that the life of the battery to be tested will not be reduced during the cycle test. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A flow chart of a battery cycle testing method provided by an embodiment of the present invention;

[0030] Figure 2 A diagram of an implementation process of a battery cycle testing method provided by an embodiment of the present invention;

[0031] Figure 3 A schematic structural diagram of a battery cycle testing device provided in an embodiment of the present invention.

[0032] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0033] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0034] In order to enable those skilled in the art to better understand the solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present application.

[0035] In the embodiments of the present application, at least one refers to one or more; multiple refers to two or more. In the description of the present application, words such as "first", "second", "third", etc. are only used to distinguish the purpose of description, and cannot be understood as indicating or implying relative importance, nor can they be understood as indicating or implying order. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0036] References to "one embodiment" or "some embodiments" etc. described in this specification mean that one or more embodiments of the present application include a particular feature, structure or characteristic described in conjunction with the embodiment. Thus, in this specification, the terms "include", "comprises", "has" and their variations all mean "including but not limited to", unless otherwise specifically emphasized.

[0037] During battery cycling, the charge current, discharge current, charge voltage, discharge voltage, and power may be adjusted based on the battery status and charging mode.

[0038] After the battery cycle test, due to the increase in the internal resistance of the battery and the decrease in the active lithium content, more voltage (or "higher potential") is required to promote the migration of lithium ions during charging, so the charging voltage will rise as the cycle test proceeds. Correspondingly, during the discharge process, due to the existence of internal resistance, a part of the current provided by the battery needs to be divided to overcome the internal resistance, resulting in a decrease in external work, so the discharge voltage will decrease.

[0039] Since power is the product of voltage and current, the power change before and after the battery cycle will also be affected by the change of voltage and current. During the constant voltage charging stage of the charging process, the charging power will change accordingly as the voltage rises and the current decreases; during the discharge process, the discharge power will also change due to the drop in voltage and possible changes in current.

[0040] In the prior art, the charging capacity and discharging capacity cannot be calibrated according to the actual battery capacity, and the charging and discharging current, charging and discharging voltage, and power, etc., cannot be set proportionally, which will reduce the service life of the battery. To address this problem, an embodiment of the present invention provides a battery cycle test method. Figure 1 A flow chart of a battery cycle testing method provided by an embodiment of the present invention, such as Figure 1 As shown, the method includes:

[0041] S110, for the battery to be tested corresponding to each test channel, executing a first discharging step according to initial discharging step parameters and testing the actual discharge capacity of the battery to be tested, and executing a first charging step according to initial charging step parameters and testing the actual charging capacity of the battery to be tested;

[0042] In the embodiment of the present invention, multiple test channels are provided, each test channel is used to perform a cycle test on a battery to be tested, wherein the battery to be tested may be a lithium-ion battery. The execution steps of the battery to be tested corresponding to each test channel are the same. For the convenience of description, the embodiment of the present invention takes any one of the test channels as an example for description.

[0043] When the test begins, the first discharge step is performed on the battery to be tested corresponding to the test channel according to the initial discharge step parameters, and during the execution of the first discharge step, when the discharge voltage of the battery to be tested is less than the termination voltage, the actual discharge capacity of the battery to be tested can be measured using the corresponding equipment.

[0044] The specific value of the termination voltage can be determined according to actual conditions, and the embodiment of the present invention does not specifically limit this. The initial discharge step parameters include discharge current, discharge voltage, power and other parameters, which can be determined according to actual conditions, and the embodiment of the present invention does not specifically limit this.

[0045] After executing the first discharge step, the first charging step is performed on the battery to be tested according to the initial charging step parameters, and during the execution of the first charging step, when the discharge voltage of the battery to be tested is greater than or equal to the termination voltage, the actual charging capacity of the battery to be tested can be measured using corresponding equipment.

[0046] The initial charging step parameters include parameters such as charging current, charging voltage and power, which can be determined based on actual conditions and are not specifically limited in the embodiment of the present invention.

[0047] S120, adjusting the initial discharge step parameters according to the actual discharge capacity to obtain adjusted discharge step parameters, and adjusting the initial charge step parameters according to the actual charge capacity to obtain adjusted charge step parameters;

[0048] Then, the initial discharge step parameters are adjusted according to the actual discharge capacity to obtain adjusted discharge step parameters, which may be the discharge current, discharge voltage and other parameters in the initial discharge step parameters, which may be determined according to actual conditions and are not specifically limited in the embodiments of the present invention.

[0049] Then, the initial charging step parameters are adjusted according to the actual charging capacity to obtain adjusted charging step parameters, which can be specifically adjusted to the charging current, charging voltage and other parameters in the initial charging step parameters, which can be determined according to actual conditions and are not specifically limited in the embodiments of the present invention.

[0050] S130, executing a second discharging step based on the adjusted discharging step parameters, and executing a second charging step based on the adjusted charging step parameters.

[0051] Finally, the second discharge step is performed using the adjusted discharge step parameters, and the second charge step is performed using the adjusted charge step parameters.

[0052] It should be noted that the discharge time and the rest time of the second discharge step can be the same as or different from those of the first discharge step, which can be determined according to actual conditions, and the embodiment of the present invention does not specifically limit this. The charging time and the rest time of the second charging step can be the same as or different from those of the first charging step, which can be determined according to actual conditions, and the embodiment of the present invention does not specifically limit this.

[0053] The present invention proposes a battery cycle test method. When each test channel performs a cycle test on a battery to be tested, the first discharge step is firstly executed according to the initial discharge step parameters, and the first charging step is executed according to the initial charging step parameters, and during the execution process, the actual discharge capacity and the actual charging capacity of the battery to be tested are tested; then, according to the actual discharge capacity and the actual charging capacity, the initial discharge step parameters and the initial charging step parameters are adjusted; finally, according to the adjusted discharge step parameters and the adjusted charging step parameters, the adjusted parameters are made more suitable for the current state of the battery to be tested, so that the life of the battery to be tested will not be reduced during the cycle test.

[0054] In some embodiments, the steps of adjusting the initial discharge step parameters according to the actual discharge capacity to obtain adjusted discharge step parameters include:

[0055] The initial discharge step parameters are adjusted according to the difference between the actual discharge capacity and the first lithium plating risk current.

[0056] After multiple cycle tests, due to the attenuation of the charge and discharge capacity, the use of a relatively high current / voltage / power exceeds the lithium deposition boundary cycle, thereby shortening the battery cycle life and avoiding the safety risk of lithium deposition. In the embodiment of the present invention, the initial discharge step parameters are adjusted according to the size between the actual discharge capacity and the first lithium deposition risk current, so that the adjusted discharge step parameters are more suitable for the current state of the battery to be tested, reducing the safety risk of lithium deposition, and will not affect the battery cycle life.

[0057] The value of the first lithium plating risk current may be determined based on actual conditions, and the embodiment of the present invention does not specifically limit this.

[0058] As an implementation mode, the initial discharge step parameters include a discharge current, and the initial discharge step parameters are adjusted according to the size between the actual discharge capacity and the first lithium deposition risk current, and the steps include:

[0059] If the preset proportion of the actual discharge capacity is greater than the first lithium plating risk current, the preset maximum discharge current is used as the discharge current.

[0060] In the embodiment of the present invention, the initial discharge step parameter includes a discharge current, and the discharge current refers to the current during the discharge step.

[0061] In the embodiment of the present invention, the actual discharge capacity of the preset ratio is calculated, for example, the preset ratio can be 80%, and then 0.8*actual discharge capacity is compared with the first lithium plating risk current. If 0.8*actual discharge capacity is greater than the first lithium plating risk current, the preset maximum discharge current is directly used as the discharge current.

[0062] The preset maximum discharge current may be determined according to actual conditions, and the embodiment of the present invention does not specifically limit this.

[0063] As an implementation mode, the initial discharge step parameters include a discharge voltage, and the initial discharge step parameters are adjusted according to the size between the actual discharge capacity and the first lithium deposition risk current, and the steps include:

[0064] If a preset proportion of the actual discharge capacity is greater than the first lithium plating risk current, a preset maximum discharge voltage is used as the discharge voltage.

[0065] In the embodiment of the present invention, the initial discharge step parameters also include a discharge voltage, and the discharge voltage refers to the voltage during the discharge step.

[0066] In the embodiment of the present invention, the actual discharge capacity of the preset ratio is calculated, for example, the preset ratio can be 80%, and then 0.8*actual discharge capacity is compared with the first lithium plating risk current. If 0.8*actual discharge capacity is greater than the first lithium plating risk current, the preset maximum discharge voltage is directly used as the discharge voltage.

[0067] The preset maximum discharge voltage may be determined according to actual conditions, and the embodiment of the present invention does not specifically limit this.

[0068] In some embodiments, the step of adjusting the initial charging step parameters according to the actual charging capacity to obtain the adjusted charging step parameters comprises:

[0069] The initial charging step parameters are adjusted according to the difference between the actual charging capacity and the second lithium plating risk current.

[0070] In the embodiment of the present invention, the initial charging step parameters are adjusted according to the size relationship between the actual charging capacity and the second lithium plating risk current, so that the adjusted charging step parameters are more suitable for the current state of the battery to be tested, reducing the safety risk of lithium plating and having no effect on the battery cycle life.

[0071] The value of the second lithium plating risk current may be determined based on actual conditions, and the embodiment of the present invention does not specifically limit this.

[0072] As an implementation mode, the initial charging step parameter includes a charging current, and the initial charging step parameter is adjusted according to the size between the actual charging capacity and the second lithium plating risk current, and the steps include:

[0073] If the preset proportion of the actual charging capacity is greater than the second lithium plating risk current, the preset maximum charging current is used as the charging current.

[0074] In the embodiment of the present invention, the initial charging step parameters include the charging current, which refers to the current of the battery to be tested during the charging process.

[0075] In the embodiment of the present invention, the actual charging capacity of the preset ratio is calculated, for example, the preset ratio can be 80%, and then 0.8*actual charging capacity is compared with the second lithium plating risk current. If 0.8*actual discharge capacity is greater than the second lithium plating risk current, the preset maximum charging voltage is directly used as the charging voltage.

[0076] The preset maximum charging voltage may be determined according to actual conditions, and the embodiment of the present invention does not specifically limit this.

[0077] As another implementation, the initial charging step parameters include a charging voltage, and if the preset proportion of the actual charging capacity is greater than the second lithium plating risk current, a preset maximum charging current is used as the charging current, and the steps include:

[0078] If the preset proportion of the actual charging capacity is greater than the second lithium plating risk current, the preset maximum charging voltage is used as the charging voltage.

[0079] In the embodiment of the present invention, the initial charging step parameter also includes a charging voltage, and the charging voltage refers to the voltage during the charging step.

[0080] In the embodiment of the present invention, the actual charging capacity of the preset ratio is calculated, for example, the preset ratio can be 80%, and then 0.8*actual charging capacity is compared with the second lithium plating risk current. If 0.8*actual charging capacity is greater than the second lithium plating risk current, the preset maximum charging voltage is directly used as the charging voltage.

[0081] The preset maximum charging voltage may be determined according to actual conditions, and the embodiment of the present invention does not specifically limit this.

[0082] As an implementation mode, the first discharge step is performed according to the initial discharge step parameters, and the steps include:

[0083] After each battery to be tested is left to stand for a preset time, the first discharge step is performed according to the initial discharge step parameters.

[0084] In the embodiment of the present invention, when executing the discharge step, each battery to be tested is first left to stand for a preset time, and then the first discharge step is executed according to the initial discharge step parameters.

[0085] As an implementation mode, the first charging step is performed according to the initial charging step parameters, and the steps include:

[0086] After each battery to be tested is left to stand for a preset time, the first charging step is performed according to the initial charging step parameters.

[0087] In the embodiment of the present invention, when executing the charging step, each battery to be tested is first left to stand for a preset time, and then the first discharging step is executed according to the initial discharging step parameters.

[0088] Among them, battery rest means that the battery is in a natural state under certain environmental conditions without any charge or discharge operations. The main purpose of resting the battery for a period of time is to allow the electrochemical system inside the battery to reach a relatively stable state.

[0089] In addition, during long-term charge / discharge, some polarization may occur inside the battery, causing a temporary drop in battery capacity. Resting the battery allows the chemical substances and charge distribution inside the battery to rebalance, thereby restoring some capacity.

[0090] The preset time can be determined according to actual conditions, and the embodiment of the present invention does not specifically limit this. For example, the preset time can be 30 minutes.

[0091] Figure 2 A battery cycle test method according to an embodiment of the present invention is provided. Figure 2 As shown in FIG. 1 , CH1, CH2 to CHn represent n test channels, where n is a positive integer. Each test channel tests a battery to be tested. The CH1 channel is taken as an example for description. Figure 2 As shown, the battery to be tested corresponding to the CH1 channel is first left alone for 30 minutes, which can be understood as standing still, and then the discharge operation is performed according to the initial discharge step parameters. Figure 2 Step 1 and step 2 can be understood as the first discharge step.

[0092] After the first discharge step is completed, the first charging step is performed. When performing the first charging step, it is first put aside for 30 minutes, and then the charging operation is performed according to the initial charging step parameters. Figure 2 Steps 3 and 4 can be understood as the first charging step.

[0093] Then, step 5 and step 6 are executed, that is, the first discharge step is executed again. During the execution of the first discharge step, it is determined whether the discharge voltage of the battery to be tested is less than or equal to the termination voltage. If the discharge voltage is less than or equal to the termination voltage, the actual discharge capacity of the battery to be tested is measured by the corresponding equipment, and C1 is used to represent the actual discharge capacity.

[0094] Then, step 7 and step 8 are performed, which can be regarded as the first charging step. During the execution of the first charging step, it is determined whether the charging voltage of the battery to be tested is greater than or equal to the termination voltage. If the charging voltage is greater than or equal to the termination voltage, the actual charging capacity of the battery to be tested is measured by the corresponding equipment, and C2 is used to represent the actual charging capacity.

[0095] Then, step 9 is performed to let the battery under test stand for 30 minutes, and the size of 0.8*C1 and I1 is determined, where I1 represents the first lithium deposition current. If 0.8*C1 is greater than or equal to I1, the preset maximum discharge current is used as the discharge current, and the discharge current is used as the current for the discharge operation in step 10.

[0096] Finally, execute step 11 and stand for 30 minutes, and judge the size of 0.8*C2 and I2, I2 represents the second lithium plating current, if 0.8*C2 is greater than or equal to I2, use the preset maximum charging current as the charging current, and use this charging current as the current for the charging operation in step 12.

[0097] Steps 1 to 12 can be regarded as a cyclic test process, and then the operations of steps 1 to 12 are continued in step 13 to complete the entire cyclic test process.

[0098] In summary, the embodiments of the present invention add parameters such as actual charging capacity and actual discharging capacity during the cycle test to calibrate the actual charging and discharging capacity of the battery to be tested. When the charging and discharging voltage reaches the judgment value, the judgment condition is used to set the variable to achieve different proportions of cyclic charging and discharging current.

[0099] The embodiments of the present invention can avoid the problem of using a relatively high fixed current / voltage / power and exceeding the lithium plating boundary cycle due to the attenuation of the charge and discharge capacity after cycling, thereby shortening the battery cycle life and generating lithium plating safety risks; the battery cycle life is improved from the charge and discharge cycle strategy, the lithium plating safety risk is reduced, the battery life cycle is extended, and the consumer's use cost is reduced.

[0100] Figure 3 A schematic diagram of a battery cycle test device provided by an embodiment of the present invention is shown in FIG. Figure 3 As shown, the device comprises:

[0101] The measuring module 310 is used for executing a first discharging step and testing an actual discharge capacity of the battery to be tested according to an initial discharging step parameter for the battery to be tested corresponding to each test channel, and executing a first charging step and testing an actual charge capacity of the battery to be tested according to an initial charging step parameter;

[0102] An adjustment module 320, configured to adjust the initial discharge step parameters according to the actual discharge capacity to obtain adjusted discharge step parameters, and to adjust the initial charge step parameters according to the actual charge capacity to obtain adjusted charge step parameters;

[0103] The optimization module 330 is used to execute the second discharge step based on the adjusted discharge step parameters, and to execute the second charge step based on the adjusted charge step parameters.

[0104] This embodiment is a device embodiment corresponding to the above method embodiment, and its specific implementation process is the same as the above method embodiment. For details, please refer to the above method embodiment, and this device embodiment does not make specific limitations on this.

[0105] Each module in the above battery cycle test device can be implemented in whole or in part by software, hardware, or a combination thereof. Each module can be embedded in or independent of a processor in a computer device in the form of hardware, or can be stored in a memory in a computer device in the form of software, so that the processor can call and execute operations corresponding to each module.

[0106] Those skilled in the art can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example. In actual applications, the above-mentioned functions can be distributed and completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above.

[0107] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A battery cycle testing method, characterized in that: include: For the battery to be tested corresponding to each test channel, according to the initial discharge step parameters, a first discharge step is performed and an actual discharge capacity of the battery to be tested is tested; according to the initial charge step parameters, a first charge step is performed and an actual charge capacity of the battery to be tested is tested; According to the actual discharge capacity, the initial discharge step parameters are adjusted to obtain adjusted discharge step parameters; according to the actual charge capacity, the initial charge step parameters are adjusted to obtain adjusted charge step parameters; Based on the adjusted discharge step parameters, a second discharge step is performed, and based on the adjusted charge step parameters, a second charge step is performed.

2. The battery cycle testing method according to claim 1, characterized in that: The step of adjusting the initial discharge step parameters according to the actual discharge capacity to obtain the adjusted discharge step parameters comprises: The initial discharge step parameters are adjusted according to the difference between the actual discharge capacity and the first lithium plating risk current.

3. The battery cycle testing method according to claim 2, characterized in that: The initial discharge step parameters include a discharge current, and the initial discharge step parameters are adjusted according to the size between the actual discharge capacity and the first lithium deposition risk current, the steps comprising: If the preset proportion of the actual discharge capacity is greater than the first lithium plating risk current, the preset maximum discharge current is used as the discharge current.

4. The battery cycle testing method according to claim 2, characterized in that: The initial discharge step parameters include a discharge voltage, and the initial discharge step parameters are adjusted according to the size between the actual discharge capacity and the first lithium deposition risk current, the steps comprising: If a preset proportion of the actual discharge capacity is greater than the first lithium plating risk current, a preset maximum discharge voltage is used as the discharge voltage.

5. The battery cycle testing method according to claim 1, characterized in that: The step of adjusting the initial charging step parameters according to the actual charging capacity to obtain the adjusted charging step parameters comprises: The initial charging step parameters are adjusted according to the difference between the actual charging capacity and the second lithium plating risk current.

6. The battery cycle testing method according to claim 5, characterized in that: The initial charging step parameters include charging current, and the initial charging step parameters are adjusted according to the difference between the actual charging capacity and the second lithium plating risk current, the steps comprising: If the preset proportion of the actual charging capacity is greater than the second lithium plating risk current, the preset maximum charging current is used as the charging current.

7. The battery cycle testing method according to claim 5, characterized in that: The initial charging step parameters include a charging voltage, and if the preset proportion of the actual charging capacity is greater than the second lithium plating risk current, a preset maximum charging current is used as the charging current, and the steps include: If the preset proportion of the actual charging capacity is greater than the second lithium plating risk current, the preset maximum charging voltage is used as the charging voltage.

8. The battery cycle testing method according to any one of claims 1 to 7, characterized in that: The first discharge step is performed according to the initial discharge step parameters, and the steps include: After each battery to be tested is left to stand for a preset time, the first discharge step is performed according to the initial discharge step parameters.

9. The battery cycle testing method according to any one of claims 1 to 7, characterized in that: The first charging step is performed according to the initial charging step parameters, and the steps include: After each battery to be tested is left to stand for a preset time, the first charging step is performed according to the initial charging step parameters.

10. A battery cycle testing device, characterized in that: include: A measuring module, for executing a first discharging step and testing an actual discharge capacity of the battery to be tested according to an initial discharging step parameter for the battery to be tested corresponding to each test channel, and executing a first charging step and testing an actual charging capacity of the battery to be tested according to an initial charging step parameter; An adjustment module, configured to adjust the initial discharge step parameters according to the actual discharge capacity to obtain adjusted discharge step parameters, and to adjust the initial charge step parameters according to the actual charge capacity to obtain adjusted charge step parameters; The optimization module is used to execute the second discharge step based on the adjusted discharge step parameters, and to execute the second charge step based on the adjusted charge step parameters.

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