Method and device for determining dynamic index of material

Abstract

A method and device for determining a dynamic index of a material, improving the performance of a battery while determining a dynamic index of a material with low complexity. The method comprises: acquiring first specific capacity, wherein the first specific capacity is the specific capacity of a target material when a charging / discharging device is discharged at a first discharging rate until a first target voltage of the charging / discharging device is reached, and the charging / discharging device comprises the target material (S210); and determining a dynamic index of the target material on the basis of the first specific capacity (S220).

Description

Method and device for determining material dynamics index

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application 202311765874.1, filed on December 19, 2023, entitled “Method and device for determining material kinetic indicators,” and the entire contents of that application are incorporated by reference into this application. Technical Field

[0003] The present application relates to the field of battery technology, and in particular to a method and device for determining material kinetic indicators. Background Art

[0004] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. In this context, electric vehicles, due to their energy-saving and environmentally friendly advantages, have become a crucial component of the industry's sustainable development. Battery technology, in turn, is a crucial factor in the development of electric vehicles.

[0005] In the development of battery technology, battery performance is an issue that cannot be ignored. Battery performance not only affects the development and application of battery-related products, but also influences consumer acceptance of electric vehicles. Therefore, how to improve battery performance is an urgent issue that needs to be addressed.

[0006] Summary of the Invention

[0007] The embodiments of the present application provide a method and apparatus for determining a material's kinetic index, which can determine the material's kinetic index with lower complexity while improving battery performance.

[0008] In a first aspect, a method for determining a material kinetic index is provided, comprising: obtaining a first specific capacity, where the first specific capacity is the specific capacity of a target material when a charge-discharge device is discharged using a first discharge rate and discharged to a cut-off voltage of the charge-discharge device, wherein the charge-discharge device includes the target material; and determining a kinetic index of the target material based on the first specific capacity.

[0009] In an embodiment of the present application, the kinetic index of the target material is determined based on the specific capacity of the target material when the charge-discharge device is discharged to its first target voltage, that is, the kinetic index of the target material is characterized by the specific capacity. On the one hand, the specific capacity of the target material when discharged to the first target voltage is relatively easy to obtain, and the operation is simple and the cost is low, which improves efficiency and effectively reduces complexity. On the other hand, if the kinetic index of the target material is good according to the specific capacity of the target material, the target material can be used to manufacture the battery. If the kinetic index of the target material is poor, the target material is not used to manufacture the battery, which not only effectively improves the performance of the battery but also reduces the waste rate of battery resources.

[0010] In some possible implementations, the method further includes: obtaining a second specific capacity, where the second specific capacity is the specific capacity of the target material when the charge-discharge device is discharged at the first discharge rate and discharged to a second target voltage; determining the kinetic index of the target material based on the first specific capacity includes: determining the kinetic index based on the first specific capacity and the second specific capacity.

[0011] The above technical solution, in addition to determining the specific capacity of the target material when the charge-discharge device is discharged to the first target voltage using the first discharge rate, also determines the kinetic index of the target material based on the specific capacity of the target material when the charge-discharge device is discharged to the second target voltage using the first discharge rate. That is, the kinetic index of the target material is determined based on multiple parameters, making the determined kinetic index more accurate.

[0012] In some possible implementations, determining the kinetic index according to the first specific capacity and the second specific capacity includes: determining the kinetic index according to a ratio between the second specific capacity and the first specific capacity.

[0013] The above technical solution determines the kinetic index of the target material based on the ratio between the second specific capacity and the first specific capacity, using this ratio as a quantitative indicator of the difference in the target material's kinetic index. This normalization process can eliminate the influence of parameters such as the absolute capacity and mass of different batches of target materials on the kinetic index. The resulting kinetic index is the true kinetic index, free of the influence of other factors, effectively improving the accuracy of the determined kinetic index.

[0014] In some embodiments, the second target voltage is greater than the first target voltage.

[0015] In the above technical solution, the second target voltage is set to be greater than the first target voltage, so that the kinetic index of the target material is determined more accurately.

[0016] In some possible implementations, the second target voltage has a value range of 2.5V-3.3V.

[0017] This makes it easier to distinguish the kinetic indices of target materials from different batches, making it easier to distinguish between them. This makes it easier to select the ideal target material, such as the one with the best kinetic indices, when comparing the kinetic indices of multiple target materials.

[0018] In some embodiments, the second target voltage is 3.2V.

[0019] This technical solution sets the second target voltage to 3.2V. This makes the differences in kinetic indicators between different batches of target materials most obvious, making it easier to distinguish the kinetic indicators of target materials from different batches. This makes it easier for users to select the ideal target material when comparing the kinetic indicators of multiple target materials, effectively reducing the comparison difficulty.

[0020] In some embodiments, the first target voltage has a value range of 1.5V-2.5V.

[0021] The above technical solution sets the first target voltage value range to 1.5V-2.5V. This, on the one hand, allows for more distinct differences in the kinetic indicators of target materials from different batches, making it easier to distinguish the kinetic indicators of target materials from different batches. This allows users to easily select the ideal target material when comparing the kinetic indicators of multiple target materials, effectively reducing the comparison effort. Furthermore, the operation is simple and easy to implement.

[0022] In some embodiments, the first target voltage is 2V.

[0023] This technical solution sets the first target voltage to 2V. This makes the differences in kinetic indicators between different batches of target materials relatively obvious, making it easier to distinguish the kinetic indicators of target materials from different batches. This makes it easier for users to select the ideal target material when comparing the kinetic indicators of multiple target materials, effectively reducing the comparison difficulty.

[0024] In some possible implementations, the first discharge rate has a value range of 0.2C-10C.

[0025] The above technical solution sets the first discharge rate range to 0.2C-10C. This allows for more distinct kinetic indicators between target materials from different batches, making it easier to distinguish them. This allows users to easily select the ideal target material, such as the one with the best kinetic indicators, when comparing the kinetic indicators of multiple target materials. This effectively reduces the difficulty of comparison.

[0026] In some possible implementations, the first discharge rate has a value range of 0.33C-2C.

[0027] This technical solution sets the value range of the first discharge rate to 0.33C-2C. Not only can the difference in kinetic indicators between different batches of target materials be maximized, but it is also relatively simple to implement, thereby improving the efficiency of determining the kinetic indicators of the target materials.

[0028] In some possible implementations, the first discharge rate is 1 C. In this way, the difference in kinetic indicators between different batches of target materials can be maximized, so that the determined kinetic indicators can better reflect the kinetic performance of the target materials.

[0029] In some possible implementations, the method further includes: charging the charge-discharge device using a first charge rate, wherein the first charge rate is greater than or equal to the first discharge rate.

[0030] The above technical solution uses a higher charge rate to charge the charge-discharge device. For example, before discharging the charge-discharge device at the first discharge rate, the higher charge rate is used to charge the charge-discharge device. This significantly reduces the charging time and improves the overall measurement efficiency. Furthermore, it provides a basis for discharging the charge-discharge device at the first discharge rate.

[0031] In some possible implementations, charging the charge-discharge device using a first charge rate includes: charging the charge-discharge device using the first charge rate until the target material is completely delithiated.

[0032] The above technical solution charges the charging and discharging device until the target material is completely delithiated, that is, the lithium ions in the target material are completely released, so that the lithium ion embedding process can be used to characterize the differences in kinetic indicators between different target materials with high accuracy.

[0033] In some possible implementations, the method further includes: performing an activation treatment on the charge-discharge device.

[0034] The above technical solution activates the charging and discharging device. For example, the charging and discharging device is activated before being discharged at the first discharge rate. This can achieve consistency between different charging and discharging devices and effectively reduce the impact of other factors on kinetic indicators.

[0035] In some possible implementations, the activating the charge-discharge device includes: charging and discharging the charge-discharge device at least once using a second charge-discharge rate, wherein the second charge-discharge rate is less than or equal to 0.1C.

[0036] The above technical solution sets the charge and discharge rate during activation treatment to a relatively low level, is relatively simple to implement, and improves the application scenarios of the charge and discharge device.

[0037] In some possible implementations, the charging and discharging device is a button battery.

[0038] Since the manufacturing process of button batteries is relatively simple, it usually only takes about 20 hours to manufacture a button battery. Therefore, the above technical solution uses button batteries, which greatly reduces the time cost and improves efficiency.

[0039] In a second aspect, a device for measuring kinetic indicators is provided, including: an acquisition unit for obtaining a first specific capacity, where the first specific capacity is the specific capacity of a target material when a charge-discharge device is discharged at a first discharge rate and discharged to a first target voltage of the charge-discharge device, and the charge-discharge device includes the target material; and a determination unit for determining the kinetic indicator of the target material based on the first specific capacity.

[0040] In some possible implementations, the acquisition unit is further used to: obtain a second specific capacity, where the second specific capacity is the specific capacity of the target material when the charge and discharge device is discharged using the first discharge rate and discharged to a second target voltage; the determination unit is specifically used to: determine the kinetic index based on the first specific capacity and the second specific capacity.

[0041] In some possible implementations, the determining unit is specifically configured to determine the kinetic index according to a ratio between the second specific capacity and the first specific capacity.

[0042] In some possible implementations, the second target voltage is greater than the first target voltage.

[0043] In some possible implementations, the second target voltage has a value range of 2.5V-3.3V.

[0044] In some possible implementations, the second target voltage is 3.2V.

[0045] In some possible implementations, the first target voltage has a value range of 1.5V-2.5V.

[0046] In some possible implementations, the first target voltage is 2V.

[0047] In some possible implementations, the first discharge rate has a value range of 0.2C-10C.

[0048] In some possible implementations, the first discharge rate has a value range of 0.33C-2C.

[0049] In some possible implementations, the first discharge rate is 1C.

[0050] In some possible implementations, the device further includes: a charging unit, configured to charge the charge-discharge device using a first charging rate, wherein the first charging rate is greater than or equal to the first discharging rate.

[0051] In some possible implementations, the charging unit is specifically configured to charge the charging and discharging device using the first charging rate until the target material is completely delithiated.

[0052] In some possible implementations, the device further includes an activation unit configured to perform activation processing on the charge-discharge device.

[0053] In some possible implementations, the activation unit is specifically configured to charge and discharge the charge-discharge device at least once using a second charge-discharge rate, wherein the second charge-discharge rate is less than or equal to 0.1C.

[0054] In some possible implementations, the charging and discharging device is a button battery.

[0055] In a third aspect, a device for measuring kinetic indicators is provided, comprising a processor and a memory, wherein the memory is used to store a computer program, and the processor is used to call the computer program to execute the method in the above-mentioned first aspect or its various implementations.

[0056] In a fourth aspect, a computer-readable storage medium is provided for storing a computer program, which enables a computer to execute the method in the above-mentioned first aspect or its various implementations. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without creative work.

[0058] In the drawings, the drawings are not drawn to scale.

[0059] FIG1 is a schematic diagram of a vehicle according to an embodiment of the present application.

[0060] FIG2 is a schematic diagram of a method for determining kinetic indicators according to an embodiment of the present application.

[0061] FIG3 is a possible process flow chart for manufacturing button batteries according to an embodiment of the present application.

[0062] FIG4 is a discharge curve diagram of the charge-discharge device according to an embodiment of the present application when discharging at a high discharge rate.

[0063] FIG5 is a schematic diagram of another method for determining kinetic indicators according to an embodiment of the present application.

[0064] FIG6 is a schematic diagram showing the ratio between the second specific capacity and the first specific capacity and the DCR deterioration ratio of the battery cell according to an embodiment of the present application.

[0065] FIG. 7 is another schematic diagram showing the ratio between the second specific capacity and the first specific capacity and the DCR deterioration ratio of the battery cell according to an embodiment of the present application.

[0066] FIG8 is a schematic block diagram of an apparatus for determining a kinetic index according to an embodiment of the present application.

[0067] FIG9 is a schematic block diagram of an apparatus for determining a kinetic index according to an embodiment of the present application. DETAILED DESCRIPTION

[0068] The following detailed description of the embodiments of the present application is provided in conjunction with the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are used to illustrate the principles of the present application, but are not intended to limit the scope of the present application, that is, the present application is not limited to the described embodiments.

[0069] In the description of this application, it should be noted that, unless otherwise specified, "plurality" means more than two; terms such as "upper," "lower," "left," "right," "inner," and "outer" indicating directions or positional relationships are merely for the purpose of facilitating the description of this application and simplifying the description, and do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting this application. Furthermore, terms such as "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0070] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0071] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0072] In the field of new energy, batteries can serve as the primary power source for electrical devices (such as vehicles, ships, or spacecraft). The battery referred to in the embodiments of this application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in this application may include a battery module or a battery pack.

[0073] A battery cell includes an electrode assembly and an electrolyte. The electrode assembly consists of a positive electrode sheet, a negative electrode sheet, and a separator. A battery cell primarily operates by the movement of metal ions between the positive and negative electrode sheets. The positive electrode sheet includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive electrode collector. The uncoated positive electrode collector protrudes from the coated positive electrode collector, and the uncoated positive electrode collector serves as the positive electrode tab. For lithium-ion batteries, for example, the positive electrode current collector can be made of aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide. The negative electrode sheet includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative electrode collector. The uncoated negative electrode collector protrudes from the coated negative electrode collector, and the uncoated negative electrode collector serves as the negative electrode tab. The negative electrode current collector can be made of copper, and the negative electrode active material can be carbon or silicon. To allow high currents to pass without melting, multiple positive electrode tabs are stacked together, and multiple negative electrode tabs are stacked together. The separator can be made of materials such as polypropylene (PP) or polyethylene (PE).

[0074] For the same material used to make batteries, the performance of different batches of materials (such as the kinetic performance of the active material mentioned above) varies. However, at present, the performance of these materials is usually not tested during the registration stage of these materials. If the kinetic performance of the material is poor, it may cause the battery cells made with these materials to have abnormal specific capacity and large fluctuations in direct current resistance (DCR), which may lead to frequent quality problems of battery cells or even batteries during the mass production stage.

[0075] For example, kinetic performance can represent the ability or ease of a material's kinetics to deintercalate and deintercalate lithium ions. A material with better kinetic performance is associated with faster lithium ion entry and redistribution within the material, leading to better battery performance.

[0076] Currently, most batteries on the market are lithium-ion batteries. The intercalation and deintercalation of lithium ions is key to the proper functioning of lithium-ion batteries and determines their performance and lifespan. During battery use, lithium ions are constantly intercalated and deintercalated, causing changes in the battery's positive and negative electrode materials, thereby affecting the battery's performance and lifespan. The intercalation process refers to the process by which lithium ions enter the battery's negative electrode from the positive electrode. During this process, lithium ions pass through the electrolyte and separator and enter the battery's negative electrode material. The deintercalation process refers to the process by which lithium ions leave the battery's negative electrode and return to the battery's positive electrode. During this process, lithium ions pass through the electrolyte and separator and return to the battery's positive electrode material.

[0077] The specific capacity of a material can be used to evaluate the kinetic performance of the material. Based on this, an embodiment of the present application proposes a method for measuring kinetic indicators, by obtaining a first specific capacity, and determining the kinetic indicators of a target material based on the first specific capacity, wherein the first specific capacity is the specific capacity of the target material when the charge-discharge device is discharged and discharged to a first target voltage using a first discharge rate, and the charge-discharge device includes a target material. That is, the kinetic indicators of the target material are characterized by the specific capacity. On the one hand, the specific capacity of the target material when discharged to the first target voltage is relatively easy to obtain, and the operation is simple, the cost is low, the efficiency is improved and the complexity is effectively reduced. On the other hand, if the kinetic indicators of the target material are determined to be good based on the specific capacity of the target material, the target material can be used to manufacture a battery. If the kinetic indicators of the target material are poor, the target material is not used to manufacture the battery, which not only effectively improves the performance of the battery, but also reduces the waste rate of battery resources.

[0078] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use batteries.

[0079] Electrical equipment may include, for example, vehicles, mobile phones, portable devices, laptop computers, ships, spacecraft, electric toys, and electric tools. Vehicles may be fuel vehicles, gas vehicles, or new energy vehicles. New energy vehicles may be pure electric vehicles, hybrid vehicles, or extended-range vehicles. Spacecraft include airplanes, rockets, space shuttles, and spacecraft. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. Electric tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical equipment.

[0080] The following description will use a vehicle as an example of an electrical device, but it should be understood that the embodiments of the present application are not limited to this.

[0081] FIG1 shows a schematic structural diagram of an electrical device in an embodiment of the present application, which is a vehicle. As shown in FIG1 , the vehicle 1 can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A motor 40, a controller 30 and a battery 10 can be provided inside the vehicle 1, and the controller 30 is used to control the battery 10 to supply power to the motor 40. For example, a battery 10 can be provided at the bottom, front or rear of the vehicle 1. The battery 10 can be used to power the vehicle 1, for example, the battery 10 can be used as an operating power source for the vehicle 1, for the circuit system of the vehicle 1, for example, for the working power requirements during the start-up, navigation and operation of the vehicle 1. In another embodiment of the present application, the battery 10 can not only be used as an operating power source for the vehicle 1, but also as a driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0082] Fig. 2 shows a schematic flow chart of a method 200 for determining a material kinetic index according to an embodiment of the present application. As shown in Fig. 2 , the method 200 may include at least part of the following contents.

[0083] S210: Obtaining a first specific capacity, wherein the first specific capacity is the specific capacity of the target material when the charge-discharge device is discharged at a first discharge rate to a first target voltage of the charge-discharge device, and the charge-discharge device includes the target material.

[0084] S220: Determine a kinetic index of the target material according to the first specific capacity.

[0085] It should be understood that the larger the first specific capacity is, the more electricity the target material releases when other parameters are the same, and the better the kinetic index of the target material is.

[0086] The kinetic index of a target material can be used to represent the kinetic performance of the target material or the kinetic performance of a charge-discharge device fabricated using the target material. For example, the kinetic index of a target material can be used to reflect the kinetic lithium ion insertion and removal capability of the target material or the lithium ion insertion and removal capability of a battery fabricated using the target material.

[0087] In an embodiment of the present application, the kinetic index of the target material is determined based on the specific capacity of the target material when the charge-discharge device is discharged to the first target voltage, that is, the kinetic index of the target material is characterized by the specific capacity. On the one hand, the specific capacity of the target material when discharged to the first target voltage is relatively easy to obtain, and the operation is simple, the cost is low, the efficiency is improved and the complexity is effectively reduced. On the other hand, the specific capacity of the target material is closely related to the kinetic index. If the kinetic index of the target material is good according to the specific capacity of the target material, the target material can be used to manufacture the battery. If the kinetic index of the target material is poor, the target material is not used to manufacture the battery, which not only effectively improves the performance of the battery, but also reduces the waste rate of battery resources.

[0088] The target material may be an active material, such as a positive electrode active material, which may be, for example, lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide.

[0089] The specific value of the first target voltage may be determined based on the characteristics of the target material. For example, the first target voltage may be the cutoff voltage of the target material.

[0090] In the embodiment of the present application, the value range of the first target voltage may be greater than or equal to 0 V. For example, the value range of the first target voltage may be 0V-0.5V, 0.5V-1V, 1V-1.5V, 1.5V-2.5V, 3V-3.8V, etc.

[0091] The above technical solution sets the first target voltage value range to 1.5V-2.5V. This, on the one hand, allows for more distinct differences in the kinetic indicators of target materials from different batches, making it easier to distinguish the kinetic indicators of target materials from different batches. This allows users to easily select the ideal target material when comparing the kinetic indicators of multiple target materials, effectively reducing the comparison effort. Furthermore, the operation is simple and easy to implement.

[0092] For example, the first target voltage can be 2V. Setting the first target voltage to 2V makes the differences in kinetic indicators between different batches of target materials relatively obvious, making it easier to distinguish the kinetic indicators of target materials from different batches. This allows users to easily select the ideal target material from among the multiple target materials when comparing their kinetic indicators, effectively reducing the difficulty of comparison.

[0093] The charging and discharging device can be a large battery made of the target material, such as a laminated battery.

[0094] Alternatively, considering the long time required to manufacture large batteries, method 200 is typically applied to the inventory registration stage, where the kinetic indicators of the target material need to be quickly determined. If the target material is used to manufacture a charge-discharge device into a large battery, it will take a long time.

[0095] Therefore, the charging and discharging device can be a small battery, such as a button battery.

[0096] FIG3 shows a possible process flow chart for manufacturing button batteries, wherein the target material in FIG3 is lithium iron phosphate.

[0097] First, weigh them. Specifically, the lithium iron phosphate, conductive agent, and polyvinylidene difluoride (PVDF) are calculated according to mass fractions of 80%-97%, 1%-10%, and 2%-10%, respectively. The amount of N-methylpyrrolidone (NMP) is calculated according to the requirement of a solid content of 25%-65%, and then weighed using an electronic balance. As an example, the proportions of lithium iron phosphate, conductive agent, and PVDF can be 90%, 5%, and 5%, respectively.

[0098] Specifically, PVDF, a conductive agent, and lithium iron phosphate are added to NMP in sequence and stirred evenly to obtain a slurry. For example, the actual solid content of NMP used can be 40%.

[0099] Next, coating is performed. The slurry is evenly applied to both sides of the aluminum foil using an automatic coating machine to form a pole piece. The coating thickness can be 200 μm.

[0100] After coating, the electrode is dried by forced air. For example, the electrode obtained in the above steps can be placed in a forced air drying oven at 100° C. and dried for 2 hours.

[0101] Afterwards, cold pressing and punching are performed. For example, a density of 1.4-1.8 g / cm³ can be used for cold pressing, followed by punching into small discs with a diameter of 14 mm and drying in a vacuum oven. After drying, the discs are transferred to a glove box for assembly.

[0102] The final step is assembly. Specifically, in a glove box, a lithium metal sheet is used as the negative electrode, a lithium iron phosphate sheet is used as the positive electrode, and nickel foam is used as the support sheet. Lithium hexafluorophosphate and a mixed carbonate-based organic solvent are used as the electrolyte. This is how a button battery is assembled.

[0103] After the button battery is assembled, the button battery can be placed in a constant temperature room or a high and low temperature box, and the temperature can be controlled within a certain range, for example, 25°C ± 2°C, to perform method 200.

[0104] Since the manufacturing process of button batteries is relatively simple, it usually only takes about 20 hours to manufacture a button battery. Therefore, the above technical solution uses button batteries, which greatly reduces the time cost and improves efficiency.

[0105] Batteries experience polarization during discharge. Generally, the greater the discharge current density, the greater the polarization. The polarization of lithium-ion batteries can generally be divided into ohmic polarization, electrochemical polarization, and concentration polarization. Ohmic polarization refers to the polarization caused by the ohmic internal resistance of the lithium-ion battery, which is composed of the electrode material, electrolyte, diaphragm resistance, and the contact resistance of each component. Electrochemical polarization refers to the polarization caused by the electrochemical reaction rate at the positive and negative electrodes being less than the electron movement rate. Concentration polarization refers to the polarization caused by the diffusion rate of the lithium ions involved in the reaction in the solid phase being less than the electrochemical reaction rate. The solid-phase diffusion capacity is the main factor affecting the material's kinetic indicators.

[0106] If the charge-discharge device is discharged at a small discharge rate, the discharge curves of the charge-discharge device obtained using different batches of target materials are basically the same, and there is no obvious difference in the kinetic indicators of different batches of target materials.

[0107] Figure 4 shows a discharge curve for a charge-discharge device at a high discharge rate. The abscissa represents the specific capacity of the target material, and the ordinate represents the voltage. It can be seen that at high discharge rates, the kinetic indices influenced by solid-phase diffusion capacity differ significantly between different batches of target material, allowing the kinetic indices of different batches of target material to be differentiated.

[0108] Therefore, the first discharge rate of the embodiment of the present application can be relatively large. If the charging and discharging device is a button battery, the first discharge rate cannot be too large. In summary, the value range of the first discharge rate can be 0.2C-10C. For example, the first discharge rate can be 0.3C, 0.5C, 3C, 3.5C, 4C, 4.5C, 5C, 6C, etc.

[0109] This makes it easier to distinguish the kinetic indices of target materials from different batches, making it easier to distinguish between them. This makes it easier to select the ideal target material, for example, the one with the best kinetic indices, when comparing the kinetic indices of multiple target materials.

[0110] Furthermore, the first discharge rate may range from 0.33C to 2C.

[0111] This technical solution sets the value range of the first discharge rate to 0.33C-2C. Not only can the difference in kinetic indicators between different batches of target materials be maximized, but it is also relatively simple to implement, thereby improving the efficiency of determining the kinetic indicators of the target materials.

[0112] For example, the first discharge rate may be 0.6 C, 1 C, 1.5 C, etc. When the first discharge rate is 1 C, the difference in kinetic indexes between target materials of different batches can be maximized, so that the determined kinetic indexes can better reflect the kinetic performance of the target materials.

[0113] Considering that the absolute capacity, mass, etc. of target materials in different batches may vary, these differences may affect the determination of kinetic indicators. In order to eliminate the influence of these differences, as shown in FIG5 , method 200 may further include:

[0114] S211: Obtaining a second specific capacity, where the second specific capacity is the specific capacity of the target material when the charge-discharge device is discharged at a first discharge rate and discharged to a second target voltage.

[0115] At this time, S220 may specifically include: determining a kinetic index of the target material according to the first specific capacity and the second specific capacity.

[0116] The present embodiment does not specifically limit the order of obtaining the first specific capacity and the second specific capacity. For example, the first specific capacity can be obtained first and then the second specific capacity, or the second specific capacity can be obtained first and then the first specific capacity, or the first specific capacity and the second specific capacity can be obtained simultaneously.

[0117] The above technical solution, in addition to determining the specific capacity of the target material when the charge-discharge device is discharged to the first target voltage using the first discharge rate, also determines the kinetic index of the target material based on the specific capacity of the target material when the charge-discharge device is discharged to the second target voltage using the first discharge rate. That is, the kinetic index of the target material is determined based on multiple parameters, making the determined kinetic index more accurate.

[0118] In some embodiments, the second target voltage may be greater than the first target voltage. For example, if the first target voltage is 1 V, the second target voltage may be 1.5 V, 2 V, 3.5 V, etc. In this way, the kinetic index of the target material is determined more accurately.

[0119] Referring again to FIG. 4 , it can be seen that when the second target voltage is within the range of 2.5V-3.3V, the specific capacities of target materials from different batches differ significantly, making it easier for users to distinguish the kinetic indicators of target materials from different batches.

[0120] Therefore, in the embodiment of the present application, the second target voltage can be in the range of 2.5V-3.3V. This allows for significant differences in the kinetic indices between target materials from different batches, making it easier to distinguish the kinetic indices of target materials from different batches. Thus, when comparing the kinetic indices of multiple target materials, users can easily select the ideal target material, for example, the target material with the best kinetic indices, effectively reducing the difficulty of comparison for users.

[0121] For example, the second target voltage can be 2.8V, 3V, 3.2V, etc. When the second target voltage is 3.2V, the differences in kinetic indicators between different batches of target materials are relatively obvious, making it easier to distinguish the kinetic indicators of target materials from different batches. This way, when the kinetic indicators of multiple target materials need to be compared, users can easily select the ideal target material from among the multiple target materials, effectively reducing the comparison difficulty for users.

[0122] As an example, the kinetic index of the target material may be determined based on the difference between the first specific capacity and the second specific capacity.

[0123] As another example, the kinetic index of the target material may be determined based on the ratio between the second specific capacity and the first specific capacity.

[0124] Among them, the larger the ratio, that is, the higher the proportion of the second specific capacity of the target material, the smaller the concentration polarization affected by the solid-phase diffusion ability of the target material, the smaller the diffusion impedance of the target material, the better the kinetic index of the target material, and the lower the risk of DCR deterioration of the corresponding battery cell.

[0125] Figure 6 shows a schematic diagram of the aforementioned ratios and the DCR degradation rate of the charge-discharge device at a 10% state of charge (SOC). In Figure 6 , the target material is lithium iron phosphate, the first discharge rate is 1C, and the second target voltage is 3.2V. The abscissa represents the ratio of the second specific capacity to the first specific capacity, and the ordinate represents the DCR degradation rate.

[0126] As can be seen from FIG6 , the larger the ratio between the second specific capacity and the first specific capacity, the lower the risk of deterioration of the DCR of the charge-discharge device including the target material, and the better the kinetic index of the target material.

[0127] The above technical solution determines the kinetic index of the target material based on the ratio between the second specific capacity and the first specific capacity, using this ratio as a quantitative indicator of the difference in the target material's kinetic index. This normalization process can eliminate the influence of parameters such as the absolute capacity and mass of different batches of target materials on the kinetic index. The resulting kinetic index is the true kinetic index, free of the influence of other factors, effectively improving the accuracy of the determined kinetic index.

[0128] It should be noted that the specific capacity of the embodiments of the present application can also be referred to as gram capacity.

[0129] Table 1 shows some test data of the embodiment of the present application, wherein the first discharge rate is 1C.

[0130] Table 1

[0131] As can be seen from Table 1, the specific capacity of the target material is 110.4675 mAh / g when the charge-discharge device is discharged to 3.2 V, and the specific capacity of the target material is 130.103 mAh / g when discharged to 2 V, so the capacity ratio of the two is 110.4675 / 130.103=84.9%.

[0132] Furthermore, the method 200 may further include: determining whether a ratio between the second specific capacity and the first specific capacity is within a preset range.

[0133] The preset range may be determined based on the characteristics of the target material, i.e., different target materials may have different preset ranges. For example, when the target material is lithium iron phosphate, the preset range may be 1-3. If the ratio of the second specific capacity to the first specific capacity is within the range of 1-3, it indicates that the kinetic indicators of the lithium iron phosphate or the kinetic indicators of a charge-discharge device made from the lithium iron phosphate are good.

[0134] Furthermore, the method 200 may further include: charging the charging and discharging device at a first charging rate.

[0135] The charging device may be charged at the first charging rate before the charging and discharging device is discharged at the first discharging rate.

[0136] The first charging rate may be relatively small, for example, 0.1C.

[0137] Alternatively, the first charge rate can be relatively high. For example, the first charge rate can be greater than or equal to the first discharge rate, such as 1C, 2C, or 3C. This significantly reduces the charging time and improves overall measurement efficiency. Furthermore, this provides a basis for discharging the charge-discharge device using the first discharge rate.

[0138] Optionally, the charge-discharge device may be charged at the first charge rate until the target material is completely delithiated. In other words, the target material is charged until the lithium ions are completely delithiated.

[0139] This technical solution charges the charging and discharging device until the target material is completely delithiated, that is, the lithium ions in the target material are completely released, so that the lithium ion embedding process can be used to characterize the differences in kinetic indicators between different target materials with high accuracy.

[0140] After the charge-discharge device is charged with constant current (CC) at the first charge rate, the charge-discharge device may be charged with constant voltage (CV). In this case, after the constant voltage charging, the target material may be in a completely delithiated state.

[0141] In order to achieve consistency among different charging and discharging devices and to minimize the influence of other factors on the final kinetic index, before S210 , method 200 may further include: activating the charging and discharging devices.

[0142] In this way, consistency between different charging and discharging devices can be achieved, effectively reducing the impact of other factors on kinetic indicators.

[0143] In some embodiments, activating the charge-discharge device may include: charging and discharging the charge-discharge device at least once using a second charge-discharge rate.

[0144] The second charge and discharge rate may be relatively large. For example, the second charge and discharge rate may be 1C, 2C, 3C, 5C, 10C, and the like.

[0145] Alternatively, the second charge-discharge rate can be relatively low, such as less than or equal to 0.1 C. For example, the second charge-discharge rate can be 0.05 C, 0.02 C, etc. The above technical solution sets the charge-discharge rate during the activation treatment to a relatively low level, which is relatively simple to implement and improves the application scenarios of the charge-discharge device, for example, the charge-discharge device can be a button battery.

[0146] In order to further demonstrate the correlation between the kinetic indicators of the target material and the DCR of the charge-discharge device including the target material, the embodiment of the present application tested five charge-discharge devices made using five batches of lithium iron phosphate at 25°C and -20°C, respectively.

[0147] First, the charge and discharge device is activated at a small rate. Specifically, 5 batches of charge and discharge devices are first allowed to stand. Optionally, taking into account efficiency and sufficient wettability, the standing time can be 3 hours to 5 hours, for example, 4 hours, so that the electrolyte is fully infiltrated into the pole piece. It should be understood that the standing time of the 5 charge and discharge devices is the same. Then, the charge and discharge device is constant-current charged at a constant charge rate of 0.1C, the voltage of the charge and discharge device is charged to 3.75V, and then the charge and discharge device is constant-voltage charged at a constant voltage of 3.75V, and the current of the charge and discharge device is charged to 50μA. The charge and discharge device is then allowed to stand, illustratively, all 5 charge and discharge devices can be allowed to stand for 5 minutes. Afterwards, the charge and discharge device is discharged (discharge, DC) to 2.0V at a discharge rate of 0.1C, and then all 5 charge and discharge devices are allowed to stand for 5 minutes.

[0148] Next, the charging and discharging devices were charged with a constant current at a constant charge rate of 1C until the voltage reached 3.75V. They were then charged with a constant voltage at a constant voltage of 3.75V until the current reached 50μA. All five charging and discharging devices were then left to rest for 5 minutes.

[0149] After the rest period, the kinetic index of the lithium iron phosphate is measured using a large discharge rate. Specifically, the charge-discharge device is discharged to the cut-off voltage of the lithium iron phosphate (eg, 2.0 V) using a discharge rate of 1C, thereby obtaining a first specific capacity.

[0150] The process of obtaining the second specific capacity is similar to the process of obtaining the first specific capacity, except that at the end of the step, the charge-discharge device is discharged to a second target voltage (eg, 3.2 V) using a discharge rate of 1 C, thereby obtaining the second specific capacity.

[0151] It should be noted that the 5-minute rest period in the above step can be understood as a process transition. The rest period for different charging and discharging devices can be the same or different. Considering test efficiency, the above steps allow all five charging and discharging devices to rest for 5 minutes. Of course, the rest period can also be other times, such as 10 minutes, 30 minutes, etc.

[0152] Figure 7 shows the test data obtained from the above test process. The ordinate represents the ratio of DCR degradation at 25°C and 10% SOC, and the abscissa represents the ratio of the second specific capacity to the first specific capacity. Fitting this ratio and value yields the expression y = -1.5199x + 1.467, with a correlation coefficient of 0.9271.

[0153] Table 2 shows the test data obtained using the above test process. The unit of specific capacity is mAh / g, DCR deterioration ratio 1 is the DCR deterioration ratio at 25°C and 10% SOC, and DCR deterioration ratio 2 is the DCR deterioration ratio at -20°C and 10% SOC.

[0154] Table 2

[0155] As can be seen from Figure 7 and Table 2, first, the kinetic indicators of lithium iron phosphate are strongly correlated with DCR, with a correlation coefficient of 0.9271. The better the kinetic indicators, the lower the probability of DCR deterioration. Second, the differences in kinetic indicators between different batches of lithium iron phosphate are more obvious at low temperatures.

[0156] It should be understood that Table 1 and Table 2 are merely examples and are not intended to limit the scope of the embodiments of the present application.

[0157] In the embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0158] Moreover, under the premise of no conflict, the various embodiments and / or technical features in the various embodiments described in this application can be arbitrarily combined with each other, and the technical solutions obtained after the combination should also fall within the protection scope of this application.

[0159] The above describes in detail the method for measuring kinetic indicators in the embodiment of the present application. The following describes the device for measuring kinetic indicators in the embodiment of the present application. It should be understood that the device for measuring kinetic indicators in the embodiment of the present application can perform the method for measuring kinetic indicators in the embodiment of the present application.

[0160] FIG8 shows a schematic block diagram of an apparatus 700 for measuring kinetic indicators according to an embodiment of the present application. As shown in FIG8 , the apparatus 700 may include:

[0161] The acquisition unit 710 is configured to acquire a first specific capacity, where the first specific capacity is the specific capacity of the target material when the charge-discharge device is discharged at a first discharge rate to a first target voltage of the charge-discharge device, and the charge-discharge device includes the target material.

[0162] The determination unit 720 is configured to determine a kinetic index of the target material according to the first specific capacity.

[0163] Optionally, in the embodiment of the present application, the acquisition unit 710 is further used to: obtain a second specific capacity, where the second specific capacity is the specific capacity of the target material when the charge-discharge device is discharged at the first discharge rate and discharged to a second target voltage.

[0164] The determining unit 720 is specifically configured to determine a kinetic index according to the first specific capacity and the second specific capacity.

[0165] Optionally, in the embodiment of the present application, the determining unit 710 is specifically configured to determine the kinetic index according to a ratio between the second specific capacity and the first specific capacity.

[0166] Optionally, in an embodiment of the present application, the second target voltage is greater than the first target voltage.

[0167] Optionally, in the embodiment of the present application, the second target voltage has a value range of 2.5V-3.3V.

[0168] Optionally, in the embodiment of the present application, the second target voltage is 3.2V.

[0169] Optionally, in an embodiment of the present application, the first target voltage has a value range of 1.5V-2.5V.

[0170] Optionally, in an embodiment of the present application, the first target voltage is 2V.

[0171] Optionally, in the embodiment of the present application, the first discharge rate ranges from 0.2C to 10C.

[0172] Optionally, in the embodiment of the present application, the first discharge rate has a value range of 0.33C-2C.

[0173] Optionally, in an embodiment of the present application, the first discharge rate is 1C.

[0174] Optionally, in the embodiment of the present application, the device 700 further includes: a charging unit, configured to charge the charging and discharging device at a first charging rate, wherein the first charging rate is greater than or equal to the first discharging rate.

[0175] Optionally, in an embodiment of the present application, the charging unit is specifically used to: charge the charging and discharging device using a first charging rate until the target material is completely delithiated.

[0176] Optionally, in the embodiment of the present application, the device 700 further includes: an activation unit for performing activation treatment on the charging and discharging device.

[0177] Optionally, in an embodiment of the present application, the activation unit is specifically configured to charge and discharge the charge and discharge device at least once using a second charge and discharge rate, wherein the second charge and discharge rate is less than or equal to 0.1C.

[0178] Optionally, in an embodiment of the present application, the charging and discharging device is a button battery.

[0179] It should be understood that the device 700 can implement the corresponding operations in the method 200. For the sake of brevity, they are not described here in detail.

[0180] Figure 9 is a schematic diagram of the hardware structure of an apparatus 800 for measuring kinetic indicators according to an embodiment of the present application. The apparatus 800 includes a memory 801, a processor 802, a communication interface 803, and a bus 804. The memory 801, the processor 802, and the communication interface 803 are connected to each other via the bus 804.

[0181] Memory 801 can be a read-only memory (ROM), a static storage device, or a random access memory (RAM). Memory 801 can store programs. When the program stored in memory 801 is executed by processor 802, processor 802 and communication interface 803 are used to perform the various steps of the method for measuring a kinetic index according to an embodiment of the present application.

[0182] The processor 802 can be a general-purpose central processing unit (CPU), a microprocessor, an application-specific integrated circuit (ASIC), a graphics processing unit (GPU) or one or more integrated circuits to execute relevant programs to implement the functions required to be performed by the units in the device of the embodiment of the present application, or to execute the method for measuring kinetic indicators of the embodiment of the present application.

[0183] The processor 802 may also be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the method for measuring kinetic indicators in the embodiment of the present application may be completed by hardware integrated logic circuits in the processor 802 or software instructions.

[0184] The processor 802 may also be a general-purpose processor, a digital signal processor (DSP), an ASIC, a field programmable gate array (FPGA), or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component. The various methods, steps, and logic block diagrams disclosed in the embodiments of the present application may be implemented or executed. The general-purpose processor may be a microprocessor or the processor may be any conventional processor, etc. The steps of the methods disclosed in the embodiments of the present application may be directly embodied as being executed by a hardware processor, or executed by a combination of hardware and software modules in the processor. The software module may be located in a storage medium mature in the art, such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory, or an electrically erasable programmable memory, a register, or the like. The storage medium is located in the memory 801, and the processor 802 reads the information in the memory 801, and in combination with its hardware completes the functions required to be performed by the units included in the device for measuring kinetic indices according to the embodiments of the present application, or performs the method for measuring kinetic indices according to the embodiments of the present application.

[0185] The communication interface 803 uses a transceiver device such as, but not limited to, a transceiver to implement communication between the apparatus 800 and other devices or a communication network.

[0186] The bus 804 may include a path for transmitting information between various components of the device 800 (eg, the memory 801 , the processor 802 , and the communication interface 803 ).

[0187] It should be noted that although the above-mentioned device 800 only shows a memory, a processor, and a communication interface, during the specific implementation process, those skilled in the art will understand that the device 800 may also include other components necessary for normal operation. At the same time, according to specific needs, those skilled in the art will understand that the device 800 may also include hardware components that implement other additional functions. In addition, those skilled in the art will understand that the device 800 may also include only the components necessary to implement the embodiments of the present application, and does not necessarily include all the components shown in Figure 8.

[0188] An embodiment of the present application further provides a computer-readable storage medium for storing a computer program, which is used to execute the methods of the various embodiments of the present application described above.

[0189] The aforementioned computer-readable storage medium may be a transient computer-readable storage medium or a non-transitory computer-readable storage medium.

[0190] An embodiment of the present application also provides a computer program product, which includes a computer program stored on a computer-readable storage medium. The computer program includes program instructions. When the program instructions are executed by a computer, the computer executes the above-mentioned method for measuring kinetic indicators.

[0191] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for determining a material kinetic index, characterized in that: include: Obtaining a first specific capacity, where the first specific capacity is the specific capacity of a target material when a charge-discharge device is discharged at a first discharge rate and discharged to a first target voltage of the charge-discharge device, wherein the charge-discharge device includes the target material; A kinetic index of the target material is determined according to the first specific capacity.

2. The method according to claim 1, characterized in that The method further comprises: Obtaining a second specific capacity, where the second specific capacity is the specific capacity of the target material when the charge-discharge device is discharged at the first discharge rate and discharged to a second target voltage; Determining the kinetic index of the target material according to the first specific capacity includes: The kinetic index is determined according to the first specific capacity and the second specific capacity.

3. The method according to claim 2, characterized in that Determining the kinetic index according to the first specific capacity and the second specific capacity includes: The kinetic index is determined according to a ratio between the second specific capacity and the first specific capacity.

4. The method according to claim 2 or 3, characterized in that: The second target voltage is greater than the first target voltage.

5. The method according to any one of claims 2 to 4, characterized in that The second target voltage has a value range of 2.5V-3.3V.

6. The method according to claim 5, characterized in that The second target voltage is 3.2V.

7. The method according to any one of claims 1 to 6, characterized in that The first target voltage has a value range of 1.5V-2.5V.

8. The method according to claim 7, characterized in that The first target voltage is 2V.

9. The method according to any one of claims 1 to 8, characterized in that The first discharge rate has a value range of 0.2C-10C.

10. The method according to claim 9, characterized in that The first discharge rate has a value range of 0.33C-2C.

11. The method according to claim 9 or 10, characterized in that: The first discharge rate is 1C.

12. The method according to any one of claims 1 to 11, characterized in that The method further comprises: The charging and discharging device is charged using a first charging rate, wherein the first charging rate is greater than or equal to the first discharging rate.

13. The method according to claim 12, characterized in that The step of charging the charging and discharging device using a first charging rate includes: The charging and discharging device is charged at the first charging rate until the target material is completely delithiated.

14. The method according to any one of claims 1 to 13, characterized in that The method further comprises: The charging and discharging device is subjected to activation treatment.

15. The method according to claim 14, characterized in that The activation treatment of the charging and discharging device comprises: The charge and discharge device is charged and discharged at least once using a second charge and discharge rate, wherein the second charge and discharge rate is less than or equal to 0.1C.

16. The method according to any one of claims 1 to 15, characterized in that The charging and discharging device is a button battery.

17. A device for determining a material kinetic index, characterized in that: include: an acquisition unit, configured to acquire a first specific capacity, wherein the first specific capacity is a specific capacity of a target material when a charge-discharge device is discharged at a first discharge rate and discharged to a first target voltage of the charge-discharge device, wherein the charge-discharge device includes the target material; A determination unit is used to determine a kinetic index of the target material according to the first specific capacity.

18. The device according to claim 17, characterized in that The acquisition unit is also used for: Obtaining a second specific capacity, where the second specific capacity is the specific capacity of the target material when the charge-discharge device is discharged at the first discharge rate and discharged to a second target voltage; The determining unit is specifically used for: The kinetic index is determined according to the first specific capacity and the second specific capacity.

19. The device according to claim 18, characterized in that The determining unit is specifically used for: The kinetic index is determined according to a ratio between the second specific capacity and the first specific capacity.

20. The device according to claim 18 or 19, characterized in that The second target voltage is greater than the first target voltage.

21. The device according to any one of claims 18 to 20, characterized in that The second target voltage has a value range of 2.5V-3.3V.

22. The device according to claim 21, characterized in that The second target voltage is 3.2V.

23. The device according to any one of claims 17 to 22, characterized in that The first target voltage has a value range of 1.5V-2.5V.

24. The device according to claim 23, characterized in that The first target voltage is 2V.

25. The device according to any one of claims 17 to 24, characterized in that The first discharge rate has a value range of 0.2C-10C.

26. The device according to claim 25, characterized in that The first discharge rate has a value range of 0.33C-2C.

27. The device according to claim 25 or 26, characterized in that The first discharge rate is 1C.

28. The device according to any one of claims 17 to 27, characterized in that The device also includes: A charging unit is used to charge the charging and discharging device using a first charging rate, wherein the first charging rate is greater than or equal to the first discharging rate.

29. The device according to claim 28, characterized in that The charging unit is specifically used for: The charging and discharging device is charged at the first charging rate until the target material is completely delithiated.

30. The device according to any one of claims 17 to 29, characterized in that The device also includes: The activation unit is used to activate the charging and discharging device.

31. The device according to claim 30, characterized in that The activation unit is specifically used for: The charge and discharge device is charged and discharged at least once using a second charge and discharge rate, wherein the second charge and discharge rate is less than or equal to 0.1C.

32. The device according to any one of claims 17 to 31, characterized in that The charging and discharging device is a button battery.

33. A device for determining a material kinetic index, characterized in that: include: Memory, used to store programs; A processor is used to execute the program stored in the memory. When the program stored in the memory is executed, the processor is used to execute the method for determining material dynamic indicators according to any one of claims 1 to 16.

34. A computer-readable storage medium, characterized in that: Used to store a computer program, wherein the computer program enables a computer to execute the method for determining a material dynamics index according to any one of claims 1 to 16.

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