Method and device for determining material dynamic indexes and computer readable storage medium

Abstract

The embodiment of the invention provides a method and device for determining material dynamic indexes and a computer readable storage medium. The performance of a battery is improved while the measurement complexity is reduced. The method comprises the steps that a first voltage is obtained, the first voltage is the voltage of a charging and discharging device under the condition that the charging and discharging device is discharged at a first discharging rate and the discharging duration reaches a first duration, and the charging and discharging device comprises a target material; second voltage is obtained, and the second voltage is the voltage of the charging and discharging device standing when discharging reaches the first duration and the voltage of the charging and discharging device standing when standing reaches the second duration; and determining the dynamic index of the target material according to the first voltage and the second voltage.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and in particular, to a method, device, and computer-readable storage medium for determining the kinetic index of a material. Background Art

[0002] Energy conservation and emission reduction are the keys to the sustainable development of the automotive industry. In this context, electric vehicles have become an important part of the sustainable development of the automotive industry due to their advantages of energy conservation and environmental protection. For electric vehicles, battery technology is an important factor related to their development.

[0003] In the development of battery technology, the performance of batteries is an issue that cannot be ignored. The performance of batteries not only affects the development and application of battery-related products, but also affects consumers' acceptance of electric vehicles. Therefore, how to improve the performance of batteries is an urgent problem to be solved. Summary of the Invention

[0004] Embodiments of this application provide a method, device, and computer-readable storage medium for determining the kinetic index of a material, which improve the performance of batteries while reducing the measurement complexity.

[0005] In a first aspect, a method for measuring the ability to intercalate and deintercalate lithium ions is provided, including: obtaining a first voltage, where the first voltage is the voltage of a charge and discharge device when discharging the charge and discharge device at a first discharge rate and the discharge duration reaches a first duration, and the charge and discharge device includes a target material; obtaining a second voltage, where the second voltage is the voltage of the charge and discharge device when the charge and discharge device is left standing after the discharge reaches the first duration and the standing duration reaches a second duration; and determining the kinetic index of the target material according to the first voltage and the second voltage.

[0006] In embodiments of this application, the kinetic index of a target material is determined by the first voltage at the end of discharge and the second voltage at the end of standing of a charge and discharge device. That is to say, the kinetic index of a target material is obtained through the voltage change process of the charge and discharge device in embodiments of this application. On the one hand, the voltage of the charge and discharge device is easily obtained, and the obtaining process is relatively simple, thus improving the measurement efficiency and effectively reducing the complexity; on the other hand, if it is better to determine the kinetic index of the target material according to the first voltage at the end of discharge and the second voltage at the end of standing, the target material can be used to manufacture a battery. If the kinetic index of the target material is poor, the target material is not used to manufacture a battery, which not only effectively improves the performance of the battery, but also reduces the waste rate of battery resources.

[0007] In some possible implementation manners, determining the kinetic index of the target material according to the first voltage and the second voltage includes: determining the kinetic index according to the difference between the first voltage and the second voltage.

[0008] Since the difference between the first voltage and the second voltage is easy to calculate, the above technical solution determines the kinetic index according to the difference between the first voltage and the second voltage, which can effectively reduce the operation complexity and improve the operation efficiency.

[0009] In some possible implementation manners, the method further includes: obtaining the mass of the target material; determining the kinetic index of the target material according to the first voltage and the second voltage includes: determining the kinetic index according to the first voltage, the second voltage, and the mass of the target material.

[0010] In the above technical solution, in addition to the first voltage and the second voltage, the mass of the target material is also used to determine the kinetic index of the target material, that is, the kinetic index of the target material is determined according to more parameters, so that the determined kinetic index is more accurate.

[0011] In some possible implementation manners, determining the kinetic index according to the first voltage, the second voltage, and the mass of the target material includes: determining the kinetic index according to the following formula: ΔEm = (E2 - E1) / m;

[0012] Wherein, E1 is the first voltage, E2 is the second voltage, m is the mass of the target material, and ΔEm is used to characterize the kinetic index.

[0013] Since the masses of different target materials may be different, the mass of the target material has a certain influence on the kinetic index. Therefore, the above technical solution determines the kinetic index through normalization processing, that is, determines the kinetic index through the ratio between the voltage difference and the mass of the target material, which can reduce the influence of the mass of the target material on the kinetic index to a certain extent, and thus can effectively improve the accuracy rate of the determined kinetic index.

[0014] In some possible implementation manners, the first duration is less than the second duration.

[0015] In this way, lithium ions and the target material can react completely, the voltage of the charge and discharge device becomes more and more stable, the fluctuations of the first voltage and the second voltage are small, so that the error can be reduced, and the accuracy rate of the kinetic index of the obtained target material is high.

[0016] In some possible implementation manners, the first duration and the first discharge rate are in an inverse proportional relationship.

[0017] In some possible implementation manners, the value range of the first discharge rate is 0.02C - 0.1C.

[0018] In the above technical solution, the value range of the first discharge rate is set to 0.02C - 0.1C. On the one hand, during the process of determining the kinetic index of the target material, the process influence is excluded, so that the finally determined kinetic index is the kinetic index itself without including the process influence; on the other hand, the static time of the subsequent charge-discharge device is effectively reduced, and the time cost is lowered; on the further hand, the accuracy of the voltage of the charge-discharge device obtained when the discharge is completed (i.e., the first voltage) and the voltage obtained when the static is completed (i.e., the second voltage) is relatively high.

[0019] In some possible implementation manners, the value range of the first discharge rate is 0.04C - 0.08C.

[0020] In the above technical solution, the value range of the first discharge rate is set to 0.04C - 0.08C. On the one hand, during the process of determining the kinetic index of the target material, the process influence is excluded, so that the finally determined kinetic index is the kinetic index itself without including the process influence; on the other hand, the static time of the subsequent charge-discharge device is further reduced, and the time cost is lowered; on the further hand, the voltage of the charge-discharge device obtained when the discharge is completed (i.e., the first voltage) and the voltage obtained when the static is completed (i.e., the second voltage) are more accurate.

[0021] In some possible implementation manners, when the discharge duration reaches the first duration, the value range of the state of charge (SOC) of the charge-discharge device is 50% - 55%.

[0022] In the above technical solution, since the difference between different target materials is the largest when the SOC is in the range of 50% - 55%. In this way, when it is necessary to compare the kinetic indexes of multiple target materials, the difference in the kinetic indexes of the multiple target materials is also the largest, thereby reducing the comparison difficulty and enabling the user to more easily select the target active substance from the multiple target materials. For example, the target material with the best kinetic index.

[0023] In some possible implementation manners, before obtaining the first voltage, the method further includes: performing activation processing on the charge-discharge device.

[0024] In the above technical solution, performing activation processing on the charge-discharge device before obtaining the first voltage can achieve the consistency between different charge-discharge devices and effectively reduce the influence of other factors on the kinetic index. Further, through the activation processing, it can be determined whether the charge-discharge device is abnormal, thereby further improving the accuracy of the kinetic index of the determined target material.

[0025] In some possible implementation manners, the activation treatment of the charge and discharge device includes: performing at least one charge and discharge on the charge and discharge device at a second charge and discharge rate, where the second charge and discharge rate is less than or equal to 0.1C.

[0026] In the above technical solution, the charge and discharge rate during the activation treatment is set to be relatively small, which is relatively simple to implement and expands the application scenarios of the charge and discharge device.

[0027] In some possible implementation manners, the performing at least one charge and discharge on the charge and discharge device at the second charge and discharge rate includes: performing charge and discharge on the charge and discharge device at the second charge and discharge rate in the order of standing, discharging, standing, charging, standing, discharging, standing.

[0028] In some possible implementation manners, the charge and discharge device is a button cell.

[0029] Since the manufacturing process of the button cell is relatively simple and it usually takes about 20 hours to manufacture the button cell. Therefore, the above technical solution using the button cell greatly reduces the time cost and improves the efficiency.

[0030] In a second aspect, a device for determining the kinetic index of a material is provided, including: an acquisition unit configured to acquire a first voltage, where the first voltage is the voltage of the charge and discharge device when discharging the charge and discharge device at a first discharge rate and the discharge duration reaches a first duration, and the charge and discharge device includes a target material; the acquisition unit is further configured to acquire a second voltage, where the second voltage is the voltage of the charge and discharge device when standing the charge and discharge device after the discharge reaches the first duration and the standing duration reaches a second duration; a determination unit configured to determine the kinetic index of the target material according to the first voltage and the second voltage.

[0031] In some possible implementation manners, the determination unit is specifically configured to: determine the kinetic index according to the difference between the first voltage and the second voltage.

[0032] In some possible implementation manners, the acquisition unit is further configured to: acquire the mass of the target material; the determination unit is specifically configured to: determine the kinetic index according to the first voltage, the second voltage, and the mass of the target material.

[0033] In some possible implementation manners, the determination unit is specifically configured to: determine the kinetic index according to the following formula: ΔEm = (E2 - E1) / m, where E1 is the first voltage, E2 is the second voltage, m is the mass of the target material, and ΔEm is used to characterize the kinetic index.

[0034] In some possible implementations, the first duration is less than the second duration.

[0035] In some possible implementations, there is an inverse relationship between the first duration and the first discharge rate.

[0036] In some possible implementations, the value range of the first discharge rate is 0.02C - 0.1C.

[0037] In some possible implementations, the value range of the first discharge rate is 0.04C - 0.08C.

[0038] In some possible implementations, when the discharge duration reaches the first duration, the value range of the state of charge (SOC) of the charge-discharge device is 50% - 55%.

[0039] In some possible implementations, before the acquisition unit acquires the first voltage, the device further includes: an activation unit for performing an activation process on the charge-discharge device.

[0040] In some possible implementations, the activation unit is specifically configured to: perform at least one charge and discharge on the charge-discharge device at a second charge-discharge rate, where the second charge-discharge rate is less than or equal to 0.1C.

[0041] In some possible implementations, the activation unit is specifically configured to: charge and discharge the charge-discharge device at the second charge-discharge rate in the order of static, discharge, static, charge, static, discharge, static.

[0042] In some possible implementations, the charge-discharge device is a button cell.

[0043] In a third aspect, a device for determining the material kinetic index is provided, including a processor and a memory. 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 first aspect or its various implementations above.

[0044] In a fourth aspect, a computer-readable storage medium is provided for storing a computer program, which causes a computer to execute the method in the first aspect or its various implementations above. Description of the Drawings

[0045] To more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments of the present application. Obviously, the following described drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the drawings.

[0046] In the drawings, the drawings are not drawn to actual scale.

[0047] Figure 1 It is a schematic diagram of a vehicle according to an embodiment of the present application.

[0048] Figure 2 It is a schematic diagram of a method for determining the material kinetics index according to an embodiment of the present application.

[0049] Figure 3 It is a schematic diagram of the current and voltage of a charge and discharge device according to an embodiment of the present application.

[0050] Figure 4 It is a schematic diagram of a method for determining the material kinetics index according to another embodiment of the present application.

[0051] Figure 5 It is a schematic block diagram of a device for determining the material kinetics index according to an embodiment of the present application.

[0052] Figure 6 It is a schematic block diagram of a device for determining the material kinetics index according to another embodiment of the present application.

[0053] Figure 7 It is a schematic block diagram of a device for determining the material kinetics index according to an embodiment of the present application. Detailed implementation manners

[0054] The following further describes the implementation manners of the present application in detail in conjunction with the drawings and embodiments. The following detailed description of the embodiments and the drawings are used to exemplarily illustrate the principle of the present application, but cannot be used to limit the scope of the present application, that is, the present application is not limited to the described embodiments.

[0055] In the description of the present application, it should be noted that unless otherwise specified, the meaning of "a plurality" is two or more; the orientation or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present application. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0056] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used in the specification of this application are only for the purpose of describing specific embodiments 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 drawings are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the specification and claims of this application or the above drawings are used to distinguish different objects and are not used to describe a specific order or primary-secondary relationship.

[0057] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of this application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described in this application can be combined with other embodiments.

[0058] In the field of new energy, a battery can be used as the main power source for electrical equipment (such as vehicles, ships, or spacecraft, etc.). The battery mentioned in the embodiments of this application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in this application can include a battery module or a battery pack, etc.

[0059] A battery cell includes an electrode assembly and an electrolyte. The electrode assembly is composed of a positive electrode plate, a negative electrode plate, and a separator. The battery cell mainly operates by the movement of metal ions between the positive electrode plate and the negative electrode plate. The positive electrode plate includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector. The positive current collector without the coated positive active material layer protrudes from the positive current collector with the coated positive active material layer. The positive current collector without the coated positive active material layer serves as the positive electrode tab. Taking a lithium-ion battery as an example, the material of the positive current collector can be aluminum, and the positive active material can be lithium cobaltate, lithium iron phosphate, ternary lithium, or lithium manganate, etc. The negative electrode plate includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector. The negative current collector without the coated negative active material layer protrudes from the negative current collector with the coated negative active material layer. The negative current collector without the coated negative active material layer serves as the negative electrode tab. The material of the negative current collector can be copper, and the negative active material can be carbon or silicon, etc. In order to achieve passing a large current without fusing, the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together. The material of the separator can be polypropylene (PP) or polyethylene (PE), etc.

[0060] The performance of materials for preparing batteries, such as the kinetic performance of active materials, is good or bad. However, currently, at the stage of warehousing registration of these materials, the performance of these materials is usually not tested, which may cause problems such as black spots during the mass production stage, seriously affecting the performance of the batteries and causing a large amount of resource waste.

[0061] Exemplarily, the kinetic performance may include the ability or difficulty of the material to intercalate and deintercalate lithium ions. If the ability of the target material to intercalate and deintercalate lithium ions is better, it indicates that the kinetic performance of the target material is better, and the process of lithium ions entering the interior of the target material and redistributing inside is faster, and the performance of the battery prepared with the target material is better.

[0062] Currently, most of the batteries on the market are lithium-ion batteries. The process of lithium-ion intercalation and deintercalation is the key to the normal operation of lithium-ion batteries, determining the performance and lifespan of lithium-ion batteries. During the use of the battery, the intercalation and deintercalation of lithium ions will occur continuously, which will cause changes in the positive and negative electrode materials of the battery, thereby affecting the performance and lifespan of the battery. The intercalation process refers to the process in which lithium ions enter the negative electrode of the battery from the positive electrode of the battery. During this process, lithium ions will pass through the electrolyte and the separator and enter the negative electrode material of the battery. The deintercalation process refers to the process in which lithium ions leave the negative electrode of the battery and return to the positive electrode of the battery. During this process, lithium ions will pass through the electrolyte and the separator and return to the positive electrode material of the battery.

[0063] Based on this, the embodiments of the present application propose a method for determining the kinetic index of a material, which determines the kinetic index of the target material through the first voltage at the end of discharge and the second voltage at the end of rest of the charge-discharge device. That is to say, the embodiments of the present application obtain the kinetic index of the target material through the voltage change process of the charge-discharge device. On the one hand, the voltage of the charge-discharge device is easy to obtain, and the obtaining process is relatively simple, thereby improving the measurement efficiency and effectively reducing the complexity; on the other hand, if the kinetic index of the target material is determined well according to the first voltage at the end of discharge and the second voltage at the end of rest, 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.

[0064] The technical solutions described in the embodiments of the present application are applicable to various electrical devices using batteries.

[0065] The electrical equipment may be, for example, a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, etc. The vehicle may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or a range-extended vehicle, etc.; the spacecraft includes an airplane, a rocket, a space shuttle, a spaceship, etc.; the electric toy includes a stationary or mobile electric toy, for example, a game console, an electric vehicle toy, an electric ship toy, an electric airplane toy, etc.; the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool and a railway electric tool, for example, an electric drill, an electric grinder, an electric wrench, an electric screwdriver, a hammer drill, an impact electric drill, a concrete vibrator, a planer, etc. The embodiments of the present application do not impose special restrictions on the above electrical equipment.

[0066] Hereinafter, the electrical equipment being a vehicle will be taken as an example for illustration, but it should be understood that the embodiments of the present application are not limited thereto.

[0067] Figure 1 The schematic structural diagram of the electrical equipment being a vehicle according to an embodiment of the present application is shown. As Figure 1 shown, the vehicle 1 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or a range-extended vehicle, etc. A motor 40, a controller 30 and a battery 10 may be arranged inside the vehicle 1, and the controller 30 is used to control the battery 10 to supply power to the motor 40. For example, the battery 10 may be arranged at the bottom, the front end or the rear end of the vehicle 1. The battery 10 may be used for power supply of the vehicle 1. For example, the battery 10 may be used as the operating power source of the vehicle 1 and used 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 may not only be used as the operating power source of the vehicle 1, but also be used as the driving power source of the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0068] Figure 2 The schematic flow chart of a method 200 for determining the material dynamics index according to an embodiment of the present application is shown. As Figure 2 shown, the method 200 may include at least some of the following contents.

[0069] S210: Obtain a first voltage, where the first voltage is the voltage of the charge-discharge device when the charge-discharge device is discharged at a first discharge rate and the discharge duration reaches a first duration, and the charge-discharge device includes a target material.

[0070] S220: Obtain a second voltage, where the second voltage is the voltage of the charge-discharge device when the charge-discharge device is left standing after the discharge reaches the first duration and the standing time reaches a second duration.

[0071] S230: Determine the kinetic index of the target material according to the first voltage and the second voltage.

[0072] The kinetic index of the target material can be used to represent the kinetic performance of the target material or the kinetic performance of the charge-discharge device made of the target material. For example, the kinetic index of the target material can be used to reflect the ability of the target material to intercalate and deintercalate lithium ions kinetically or to reflect the ability of the battery made of the target material to intercalate and deintercalate lithium ions.

[0073] The target material can be an active material, such as a negative electrode active material. The negative electrode active material can be, for example, graphite or the like.

[0074] Determine the kinetic index of the target material through the first voltage at the end of discharge and the second voltage at the end of rest of the charge-discharge device. That is to say, the kinetic index of the target material is obtained through the voltage change process of the charge-discharge device in the embodiments of the present application. On the one hand, the voltage of the charge-discharge device is easy to obtain, and the obtaining process is relatively simple, thereby improving the measurement efficiency and effectively reducing the complexity; on the other hand, if it is better to determine the kinetic index of the target material according to the first voltage at the end of discharge and the second voltage at the end of rest, the battery can be manufactured using the target material. 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.

[0075] Optionally, the charge-discharge device can be a large battery made of the target material, such as a laminated battery.

[0076] Or, considering that it takes a long time to manufacture a large battery, Method 200 is usually applied to the warehousing registration stage. At this time, it is necessary to quickly determine the kinetic index of the target material. If the charge-discharge device is manufactured as a large battery using the target material, it will take a long time.

[0077] Therefore, the charge-discharge device can be a small battery, such as a button battery.

[0078] Since the manufacturing process of the button battery is relatively simple, it usually only takes about 20 hours to manufacture the button battery. Therefore, the above technical solution uses a button battery, which greatly reduces the time cost and improves the efficiency.

[0079] In order to make the result obtained when determining the kinetic index of the target material be the kinetic index itself, without including other factors, such as process factors, such as coating weight or compaction density, etc. Therefore, Method 200 needs to exclude the process influence. Since the pore liquid phase impedance of lithium ions is closely related to the process, Method 200 can exclude the process influence by excluding the pore liquid phase impedance of lithium ions.

[0080] If the first discharge rate is relatively large, then during the discharge process of the charge and discharge device, lithium ions are likely to accumulate in the pores, resulting in pore liquid phase impedance, thus making it impossible to eliminate the process influence. In addition, the subsequent standing time of the charge and discharge device may be too long, with a high time cost, and there may be situations where the first voltage and the second voltage are distorted.

[0081] Therefore, in the embodiments of the present application, the first discharge rate is relatively small. However, if the first discharge rate is too small, part of the solid-phase process has occurred during the discharge process, and it is difficult to verify the solid-phase polarization through the second voltage of the charge and discharge device subsequently.

[0082] Based on the above considerations, in some embodiments, the value range of the first discharge rate can be 0.02C - 0.1C. For example, the first discharge rate can be 0.03C, 0.45C, 0.09C, etc.

[0083] In the above technical solution, the value range of the first discharge rate is set to 0.02C - 0.1C. On the one hand, the process influence is excluded during the process of determining the kinetic index of the target material, so that the finally determined kinetic index is the kinetic index itself without the influence of the process; on the other hand, the subsequent standing time of the charge and discharge device is effectively reduced, reducing the time cost; on the further hand, the accuracy of the voltage (i.e., the first voltage) of the charge and discharge device obtained when the discharge is completed and the voltage (i.e., the second voltage) obtained when the standing is completed is relatively high.

[0084] Furthermore, the value range of the first discharge rate can be 0.04C - 0.08C. For example, the first discharge rate can be 0.04C, 0.05C, 0.06C, or 0.07C, etc.

[0085] Optionally, the first duration can be the voltage of the charge and discharge device when discharging the charge and discharge device at the first discharge rate and the discharge is completed. The second voltage is the voltage of the charge and discharge device when standing the charge and discharge device after the discharge is completed and the standing is completed.

[0086] The embodiments of the present application do not make specific limitations on the first duration and the second duration. As an example, the value range of the first duration can be between 30 minutes and 150 minutes. For example, when the first discharge rate is 0.04C, the first duration can be 75 minutes or 150 minutes. Furthermore, the value range of the first duration can be between 45 minutes and 135 minutes, or between 60 minutes and 120 minutes, or between 80 minutes and 110 minutes.

[0087] The first duration can be inversely proportional to the first discharge rate. For example, when the first discharge rate is 0.04C, the first duration is 75 minutes. When the first discharge rate is 0.05C, the first duration is 60 minutes.

[0088] The second duration can be determined according to the voltage change trend of the charge-discharge device after standing the charge-discharge device. As Figure 3 shown, the charge-discharge device starts to be discharged at time T1. When the discharge is completed, that is, at time T2, the charge-discharge device starts to be in a standing state. The voltage of the charge-discharge device starts to drop relatively fast at first and then slowly tends to be stable. At time T3, the voltage of the charge-discharge device no longer changes and the standing ends. Then the second duration is T3 - T2.

[0089] The standing process of the charge-discharge device is the depolarization process. The speed of depolarization can be used to characterize the kinetic index of the target material. If the depolarization process of the target material is faster, it means that the kinetic performance of the target material, that is, the kinetic index is better.

[0090] Depolarization can be understood as the process in which lithium ions enter from the surface of the target material into the interior and redistribute inside the target material. Assuming the target material is graphite, after lithium ions enter the interior of graphite and form a compound with graphite, it indicates that the depolarization process ends and the standing is completed.

[0091] In order to make the reaction between the target material and lithium ions complete, the second duration in the embodiments of the present application is relatively long. Optionally, in some embodiments, the first duration can be less than the second duration. For example, the first duration is 30 minutes and the second duration is 200 minutes.

[0092] Exemplarily, the value range of the second duration can be between 40 minutes and 200 minutes. Further, the value range of the second duration can be between 60 - 180 minutes, or the value range of the second duration can be between 70 - 160 minutes, or the value range of the second duration can be between 90 - 145 minutes.

[0093] In this way, lithium ions and the target material can react completely, the voltage of the charge-discharge device becomes more and more stable, the fluctuations of the first voltage and the second voltage are small, so as to reduce errors and the accuracy rate of the kinetic index of the target material obtained is relatively high.

[0094] After obtaining the first voltage and the second voltage, S230 can specifically include: determining the kinetic index of the target material according to the difference between the first voltage and the second voltage.

[0095] Specifically, the smaller the difference between the first voltage and the second voltage, the easier it is for lithium ions to enter the interior of the target material, and the better the kinetic index of the target material.

[0096] For example, the difference between the first voltage and the second voltage of the target material 1 is ΔE1, and the difference between the first voltage and the second voltage of the target material 2 is ΔE2. If ΔE1 < ΔE2, then the kinetic performance of the target material 1 is better than that of the target material 2.

[0097] Since the difference between the first voltage and the second voltage is easy to calculate, the above technical solution determines the kinetic index through the difference between the first voltage and the second voltage, which can effectively reduce the operation complexity and improve the operation efficiency.

[0098] Alternatively, the kinetic index of the target material can also be determined according to the ratio between the first voltage and the second voltage.

[0099] When comparing the kinetic indexes of multiple target materials through the first voltage and the second voltage, in order to make the comparison result more accurate, the influence of other parameters of the target material on the comparison result can be excluded. For example, if the mass of the target material 1 is different from that of the target material 2, even if the difference between the first voltage and the second voltage of the target material 1 is smaller than the difference between the first voltage and the second voltage of the target material 2, it does not necessarily mean that the kinetic index of the target material 1 is better than that of the target material 2. Because the masses of the target material 1 and the target material 2 are different, the mass of the target material will also affect the determination of the kinetic index.

[0100] Therefore, the method 200 may further include: obtaining the parameters of the target material. At this time, the first voltage, the second voltage, and the parameters of the target material are used to determine the kinetic index.

[0101] The parameters of the target material may include but are not limited to the mass of the target material. That is to say, S230 may specifically include: determining the kinetic index of the target material according to the first voltage, the second voltage, and the mass of the target material.

[0102] Optionally, during the manufacturing process of the charge and discharge device, the mass of the target material can be obtained during the weighing stage. Specifically, the mass of the target material can be obtained based on the mass of the electrode sheet and the mass of the current collector. For example, the difference between the mass of the electrode sheet and the mass of the current collector can be obtained first, and then the product of the difference and the specific gravity of the target material can be used as the mass of the target material. Here, the specific gravity of the target material is the proportion of the target material in the formula.

[0103] For example, if the mass of the electrode sheet is 16.869 mg, the mass of the substrate is 6.45 mg, and the specific gravity of the active material is 91.6%, then the mass of the target material is 9.543804 mg. Another example, if the mass of the electrode sheet is 16.296 mg, the mass of the substrate is 6.46 mg, and the specific gravity of the active material is 91.6%, then the mass of the target material is 9.009776 mg.

[0104] In the above technical solution, in addition to the first voltage and the second voltage, the mass of the target material is also used to determine the kinetic index of the target material, that is, the kinetic index of the target material is determined based on more parameters, making the determined kinetic index more accurate.

[0105] As an example, S230 may specifically include: determining the kinetic index of the target material according to the following formula:

[0106] ΔEm = (E2 - E1) / m

[0107] Where E1 is the first voltage, E2 is the second voltage, m is the mass of the target material, and ΔEm is used to characterize the kinetic index. The smaller ΔEm is, the better the kinetic index of the target material is, that is, the better the kinetic performance of the target material is.

[0108] Since the masses of different target materials may be different, the mass of the target material has a certain influence on the kinetic index. Therefore, the above technical solution can, to a certain extent, reduce the influence of the mass of the target material on the kinetic index by normalizing, that is, determining the kinetic index by the ratio between the voltage difference and the mass of the target material, and thus can effectively improve the accuracy of the determined kinetic index.

[0109] When the discharge duration reaches the first duration, the state of charge (SOC) of the charge-discharge device can be any value. For example, the SOC of the charge-discharge device can be in the range of 10% - 80%, such as 30%, 40%, 60% or 70%, etc.

[0110] In the embodiments of the present application, three charge-discharge devices are selected, namely charge-discharge device a, charge-discharge device b, and charge-discharge device c. Among them, charge-discharge device a includes target material a1, charge-discharge device b includes target material b1, and charge-discharge device c includes target material c1. Among them, the kinetic indexes of target materials a1, b1, and c1 are somewhat different. In the embodiments of the present application, the charge-discharge device a, charge-discharge device b, and charge-discharge device c are discharged and then statically placed every 5% SOC from 10% SOC to 80% SOC, and the data in Table 1 are obtained.

[0111] Table 1

[0112] SOC ΔEm(a1 - b1) ΔEm(a1 - c1) 10％-15％ 0.278485 0.078999 15％-20％ 0.278562 0.079031 20％-25％ 0.252092 0.110522 25％-30％ 0.305428 0.111152 30％-35％ 0.291673 0.120005 35％-40％ 0.331901 0.138139 40％-45％ 0.363053 0.151790 45％-50％ 0.349603 0.139354 50％-55％ 0.784220 0.374001 55％-60％ 0.274702 0.106796 60％-65％ 0.258303 0.102606 65％-70％ 0.289784 0.120787 70％-75％ 0.341417 0.130053 75％-80％ 0.439715 0.179352

[0113] Where the unit of ΔEm is (V / mg), ΔEm(a1 - b1) = ΔEm(a1) - ΔEm(b1), and ΔEm(a1 - c1) = ΔEm(a1) - ΔEm(c1).

[0114] As can be seen from Table 1, when the SOC is in the range of 10% - 80%, the differences in the kinetic indexes of different target materials can be distinguished. Further, when the SOC is in the range of 50% - 55%, the differences in the kinetic indexes of different target materials are the largest, that is, the discrimination degree of the kinetic indexes is the largest.

[0115] Therefore, in some embodiments, when the discharge duration reaches the first duration, the range of the SOC of the charge-discharge device can be 50% - 55%. For example, the SOC of the charge-discharge device is 52% or 53%, etc.

[0116] In the above technical solution, since the differences between different target materials are the largest when the SOC is in the range of 50% - 55%. In this way, when it is necessary to compare the kinetic indexes of multiple target materials, the differences in the kinetic indexes of the multiple target materials are also the largest, thereby reducing the comparison difficulty and enabling the user to more easily select an ideal target material from the multiple target materials. For example, the target material with the best kinetic index.

[0117] Optionally, the embodiment of the present application can discharge the charge-discharge device only once.

[0118] Or, if the SOC of the charge-discharge device does not reach 50% - 55% when the charge-discharge device is discharged once, the charge-discharge device can be discharged multiple times until the SOC of the charge-discharge device is in the range of 50% - 55%.

[0119] In order to achieve the consistency between different charge-discharge devices and make the finally obtained kinetic indexes as little affected by other factors as possible. Therefore, before S210, method 200 can further include: performing an activation process on the charge-discharge device.

[0120] In this way, the consistency between different charge-discharge devices can be achieved, and the influence of other factors on the kinetic indexes is effectively reduced. Further, through the activation process, it can be determined whether the charge-discharge device is abnormal, that is, the activation process can be a process of judging abnormality, thereby further improving the accuracy of the kinetic indexes of the determined target materials.

[0121] In some embodiments, performing an activation process on the charge-discharge device can include: performing at least one charge and discharge on the charge-discharge device at a second charge-discharge rate.

[0122] The second charge-discharge rate can be relatively large. For example, the second charge-discharge rate can be 1C, 2C, 3C, 5C, 10C, etc.

[0123] Alternatively, the second charge-discharge rate can be relatively small, such as less than or equal to 0.1C. For example, the second charge-discharge rate can be 0.05C, 0.02C, etc. In the above technical solution, the charge-discharge rate during the activation treatment is set to be relatively small, which is relatively simple to implement and expands the application scenarios of the charge-discharge device. For example, the charge-discharge device can be a button battery.

[0124] Specifically, the charge-discharge device can be charged at the second charge-discharge rate in the order of standing, discharging, standing, charging, standing, discharging, and standing.

[0125] For example, the charge-discharge device can be left standing for a sufficient time, then discharged at a discharge rate of 0.05C. When the voltage of the charge-discharge device drops to 0.005V, the charge-discharge device is left standing for 10 minutes, and then charged at a charging rate of 0.05C, for example, until fully charged. After leaving the charge-discharge device standing for 10 minutes, the current is kept constant, for example, at 0.05C. Then, the charge-discharge device is discharged for 10 hours, and then the charge-discharge device is left standing fully, such as for 1 hour.

[0126] The following describes the solution of the embodiments of the present application in detail with reference to specific embodiments. It should be understood that the following examples are only for more clearly describing the embodiments of the present application and do not limit the scope of the embodiments of the present application.

[0127] Among them, the target material is graphite. The mass of graphite A is 9.543804mg, the mass of graphite B is 9.867152mg, and the mass of graphite C is 9.009776mg.

[0128] First, the user obtains button battery A, button battery B, and button battery C using graphite A, graphite B, and graphite C respectively.

[0129] After that, the user tests button battery A, button battery B, and button battery C according to the test process shown in Table 2.

[0130] Table 2

[0131] Step Process flow 1 Stand still for 10 minutes 2 Discharge at 0.05C to 0.005V 3 Stand still for 10 minutes 4 Charge at 0.05C to 2.0V 5 Stand still for 10 minutes 6 Discharge at 0.05C for 10 hours 7 Stand still for 1 hour 8 Discharge at 0.04C for 75 minutes 9 Stand still for 80 minutes 10 End

[0132] Among them, steps 1-step 5 are to activate the button battery, that is, the process of activation treatment. The purpose of step 6 is to allow lithium ions to enter the button battery. Since polarization usually occurs during long-term discharging, in order to eliminate polarization, button battery A, button battery B, and button battery C are left standing for 1 hour after step 6 is completed. The voltage after step 8 is completed is the first voltage E1, and the voltage after step 9 is completed is the second voltage E2.

[0133] Table 3 shows the data of button battery A, button battery B, and button battery C.

[0134] Table 3

[0135]

[0136]

[0137] Among them, m is the mass of graphite, ΔE = E2 - E1, and ΔEm = (E2 - E1) / m. It can be seen from Table 3 that the ΔEm of button battery A, button battery B, and button battery C increases in sequence. Therefore, the kinetic index of graphite A is the best, that of graphite B is the second best, and that of graphite C is the worst.

[0138] It should be understood that Tables 1 - 3 are only examples and do not limit the scope of the embodiments of the present application.

[0139] Figure 4 shows a schematic flowchart of another method 400 for determining the kinetic index of a material according to an embodiment of the present application. As Figure 4 shown, method 400 may include at least some of the following content.

[0140] S410: Obtain a third voltage, where the third voltage is the voltage of the charge-discharge device when charging the charge-discharge device at a first charging rate and the charging duration reaches a third duration. The charge-discharge device includes a target material.

[0141] S420: Obtain a fourth voltage, where the fourth voltage is the voltage of the charge-discharge device when the charge-discharge device is left standing after charging reaches the third duration and the standing duration reaches a fourth duration.

[0142] S430: Determine the kinetic index of the target material according to the third voltage and the fourth voltage.

[0143] Among them, the target material may include a positive electrode active material, and the positive electrode active material may be, for example, lithium cobaltate, lithium iron phosphate, ternary lithium, or lithium manganate, etc.

[0144] Optionally, in an embodiment of the present application, S430 may specifically include: determining the kinetic index according to the difference between the third voltage and the fourth voltage.

[0145] Optionally, in an embodiment of the present application, method 400 further includes: obtaining the mass of the target material; S430 may specifically include: determining the kinetic index according to the third voltage, the fourth voltage, and the mass of the target material.

[0146] Optionally, in an embodiment of the present application, S430 may specifically include: determining the kinetic index according to the following formula:

[0147] ΔEm = (E4 - E3) / m

[0148] Among them, E3 is the third voltage, E4 is the fourth voltage, m is the mass of the target material, and ΔEm is used to characterize the kinetic index.

[0149] Optionally, in the embodiments of the present application, the third duration is less than the fourth duration.

[0150] Optionally, in the embodiments of the present application, there is an inverse relationship between the third duration and the first charging rate.

[0151] Optionally, in the embodiments of the present application, the value range of the first charging rate is 0.02C - 0.1C.

[0152] Optionally, in the embodiments of the present application, the value range of the first charging rate is 0.04C - 0.08C.

[0153] Optionally, in the embodiments of the present application, when the charging duration reaches the third duration, the value range of the SOC of the charge and discharge device is 50% - 55%.

[0154] Optionally, in the embodiments of the present application, before S410, method 400 further includes: performing an activation process on the charge and discharge device.

[0155] Optionally, in the embodiments of the present application, performing an activation process on the charge and discharge device includes: performing at least one charge and discharge on the charge and discharge device at a third charge and discharge rate, where the third charge and discharge rate is less than or equal to 0.1C.

[0156] Optionally, in the embodiments of the present application, performing at least one charge and discharge on the charge and discharge device at a third charge and discharge rate includes: performing charge and discharge on the charge and discharge device at a third charge and discharge rate in the order of static, discharge, static, charge, static, discharge, static.

[0157] Optionally, in the embodiments of the present application, the charge and discharge device is a button battery.

[0158] It should be understood that although methods 200 and 400 are described separately above, this does not mean that methods 200 and 400 are independent. The descriptions of methods 200 and 400 can refer to each other. Under the condition of no contradiction, the optional solutions of methods 200 and 400 can be used in combination.

[0159] In the embodiments of the present application, the magnitudes of the serial numbers of the above processes do not mean the sequence of execution. The execution sequence of each process should be determined by its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

[0160] Moreover, on the premise of no conflict, the various embodiments described in this application and / or the technical features in the various embodiments can be combined arbitrarily with each other, and the technical solutions obtained after the combination should also fall within the protection scope of this application.

[0161] The method for determining the material kinetic index of the embodiment of this application is described in detail above. Next, the device for determining the material kinetic index of the embodiment of this application will be described. It should be understood that the device for determining the material kinetic index in the embodiment of this application can execute the method for determining the material kinetic index in the embodiment of this application.

[0162] Figure 5 A schematic block diagram of the device 500 for determining the material kinetic index of the embodiment of this application is shown. As Figure 5 shown, the device 500 for determining the material kinetic index may include:

[0163] An acquisition unit 510, configured to acquire a first voltage, where the first voltage is the voltage of the charge-discharge device when the charge-discharge device is discharged at a first discharge rate and the discharge duration reaches a first duration, and the charge-discharge device includes a target material.

[0164] The acquisition unit 510 is further configured to acquire a second voltage, where the second voltage is the voltage of the charge-discharge device when the charge-discharge device is left standing after the discharge reaches the first duration and the standing duration reaches a second duration.

[0165] A determination unit 520, configured to determine the kinetic index of the target material according to the first voltage and the second voltage.

[0166] Optionally, in the embodiment of this application, the determination unit 520 is specifically configured to: determine the kinetic index according to the difference between the first voltage and the second voltage.

[0167] Optionally, in the embodiment of this application, the acquisition unit 510 is further configured to: acquire the mass of the target material; the determination unit 520 is specifically configured to: determine the kinetic index according to the first voltage, the second voltage, and the mass of the target material.

[0168] Optionally, in the embodiment of this application, the determination unit 520 is specifically configured to: determine the kinetic index according to the following formula: ΔEm = (E2 - E1) / m; where E1 is the first voltage, E2 is the second voltage, m is the mass of the target material, and ΔEm is used to characterize the kinetic index.

[0169] Optionally, in the embodiment of this application, the first duration is less than the second duration.

[0170] Optionally, in the embodiments of the present application, there is an inverse relationship between the first duration and the first discharge rate.

[0171] Optionally, in the embodiments of the present application, the value range of the first discharge rate is 0.02C - 0.1C.

[0172] Optionally, in the embodiments of the present application, the value range of the first discharge rate is 0.04C - 0.08C.

[0173] Optionally, in the embodiments of the present application, when the discharge duration reaches the first duration, the value range of the state of charge (SOC) of the charge-discharge device is 50% - 55%.

[0174] Optionally, in the embodiments of the present application, before the acquisition unit 510 acquires the first voltage, the device 500 for determining the material kinetic index further includes: an activation unit for performing activation processing on the charge-discharge device.

[0175] Optionally, in the embodiments of the present application, the activation unit is specifically configured to: perform at least one charge and discharge on the charge-discharge device at a second charge-discharge rate, where the second charge-discharge rate is less than or equal to 0.1C.

[0176] Optionally, in the embodiments of the present application, the activation unit is specifically configured to: charge and discharge the charge-discharge device at the second charge-discharge rate in the order of static, discharge, static, charge, static, discharge, static.

[0177] Optionally, in the embodiments of the present application, the charge-discharge device is a button battery.

[0178] It should be understood that the device 500 for determining the material kinetic index can implement the corresponding operations in the method 200. For the sake of brevity, it will not be elaborated here.

[0179] Figure 6 The schematic block diagram of the device 600 for determining the material kinetic index according to another embodiment of the present application is shown. As Figure 6 shown, the device 600 for determining the material kinetic index may include:

[0180] An acquisition unit 610 for acquiring a third voltage, where the third voltage is the voltage of the charge-discharge device when charging the charge-discharge device at a first charge rate and the charging duration reaches a third duration, and the charge-discharge device includes a target material.

[0181] The acquisition unit 610 is further configured to acquire a fourth voltage, where the fourth voltage is the voltage of the charge-discharge device when the charge-discharge device is static after charging reaches the third duration and the static duration reaches a fourth duration.

[0182] A determination unit 620, configured to determine a kinetic index of a target material according to a third voltage and a fourth voltage.

[0183] Optionally, in an embodiment of the present application, the determination unit 620 may specifically be configured to: determine the kinetic index according to a difference between the third voltage and the fourth voltage.

[0184] Optionally, in an embodiment of the present application, the acquisition unit 610 is further configured to: acquire the mass of the target material; the determination unit 620 may specifically be configured to: determine the kinetic index according to the third voltage, the fourth voltage, and the mass of the target material.

[0185] Optionally, in an embodiment of the present application, the determination unit 620 may specifically be configured to determine the kinetic index according to the following formula: ΔEm = (E4 - E3) / m; where E3 is the third voltage, E4 is the fourth voltage, m is the mass of the target material, and ΔEm is used to characterize the kinetic index.

[0186] Optionally, in an embodiment of the present application, the third duration is less than the fourth duration.

[0187] Optionally, in an embodiment of the present application, the third duration and the first charge rate are inversely proportional to each other.

[0188] Optionally, in an embodiment of the present application, the value range of the first charge rate is 0.02C - 0.1C.

[0189] Optionally, in an embodiment of the present application, the value range of the first charge rate is 0.04C - 0.08C.

[0190] Optionally, in an embodiment of the present application, when the charging duration reaches the third duration, the value range of the SOC of the charge and discharge device is 50% - 55%.

[0191] Optionally, in an embodiment of the present application, before the acquisition unit 610 acquires the third voltage, the device 600 for determining the material kinetic index further includes: an activation unit, configured to perform an activation process on the charge and discharge device.

[0192] Optionally, in an embodiment of the present application, the activation unit is specifically configured to: perform at least one charge and discharge on the charge and discharge device at a third charge and discharge rate, where the third charge and discharge rate is less than or equal to 0.1C.

[0193] Optionally, in an embodiment of the present application, the activation unit is specifically configured to: perform charge and discharge on the charge and discharge device at the third charge and discharge rate in the order of standing, discharging, standing, charging, standing, discharging, standing.

[0194] Optionally, in the embodiments of the present application, the charging and discharging device is a button battery.

[0195] It should be understood that the device 600 for determining the material kinetic index can implement the corresponding operations in the method 400. For the sake of brevity, it will not be described in detail here.

[0196] Figure 7 FIG. 7 is a schematic hardware structure diagram of a device 700 for determining the material kinetic index according to an embodiment of the present application. The device 700 for determining the material kinetic index includes a memory 701, a processor 702, a communication interface 703, and a bus 704. Among them, the memory 701, the processor 702, and the communication interface 703 are communicatively connected to each other through the bus 704.

[0197] The memory 701 may be a read-only memory (ROM), a static storage device, and a random access memory (RAM). The memory 701 may store a program. When the program stored in the memory 701 is executed by the processor 702, the processor 702 and the communication interface 703 are used to execute the respective steps of the method for determining the material kinetic index according to the embodiment of the present application.

[0198] The processor 702 may 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, and is used to execute relevant programs to implement the functions required to be executed by the units in the device according to the embodiment of the present application, or to execute the method for determining the material kinetic index according to the embodiment of the present application.

[0199] The processor 702 may also be an integrated circuit chip with signal processing capabilities. In the implementation process, the respective steps of the method for determining the material kinetic index according to the embodiment of the present application may be completed by the integrated logic circuit in the hardware of the processor 702 or by instructions in the form of software.

[0200] The above-mentioned processor 702 may also be a general-purpose processor, a digital signal processor (DSP), an ASIC, a field programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components. It can implement or execute the various methods, steps, and logic block diagrams disclosed in the embodiments of the present application. The general-purpose processor may be a microprocessor, or the processor may also be any conventional processor, etc. The steps of the method disclosed in combination with the embodiments of the present application may be directly embodied as being executed by a hardware processor, or may be executed by a combination of hardware and software modules in the processor. The software module may be located in a mature storage medium in the art such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory, or an electrically erasable programmable memory, a register, etc. This storage medium is located in the memory 701, and the processor 702 reads the information in the memory 701 and combines its hardware to complete the functions required to be executed by the units included in the device 700 for determining the material dynamics index in the embodiments of the present application, or executes the method for determining the material dynamics index in the embodiments of the present application.

[0201] The communication interface 703 uses a transceiver device such as, but not limited to, a transceiver to implement the communication between the device 700 for determining the material dynamics index and other devices or communication networks.

[0202] The bus 704 may include a path for transmitting information between the various components (e.g., the memory 701, the processor 702, the communication interface 703) of the device 700 for determining the material dynamics index.

[0203] It should be noted that although the above-mentioned device 700 for determining the material dynamics index only shows a memory, a processor, and a communication interface, in the specific implementation process, those skilled in the art should understand that the device 700 for determining the material dynamics index may also include other devices necessary for normal operation. At the same time, according to specific needs, those skilled in the art should understand that the device 700 for determining the material dynamics index may also include hardware devices for implementing other additional functions. In addition, those skilled in the art should understand that the device 700 for determining the material dynamics index may also only include the devices necessary for implementing the embodiments of the present application, and do not necessarily include Figure 7 all the devices shown in

[0204] The embodiments of the present application also provide a computer-readable storage medium for storing a computer program, and the computer program is used to execute the methods of the various embodiments of the present application described above.

[0205] The above computer-readable storage medium may be a transient computer-readable storage medium or a non-transient computer-readable storage medium.

[0206] An embodiment of the present application further provides a computer program product. The computer program product 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 is caused to execute the method for determining the material dynamics index described above.

[0207] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and are not intended to limit them. Although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for determining the kinetic index of a material, characterized in that, Including: Obtaining a first voltage, where the first voltage is the voltage of the charge-discharge device when discharging the charge-discharge device at a first discharge rate and the discharge duration reaches a first duration, and the charge-discharge device includes a target material; Obtaining a second voltage, where the second voltage is the voltage of the charge-discharge device when the charge-discharge device is left static after discharging reaches the first duration and the static time reaches a second duration; Determining a kinetic index of the target material according to the first voltage and the second voltage.

2. The method according to claim 1, wherein The determining the kinetic index of the target material according to the first voltage and the second voltage includes: Determining the kinetic index according to the difference between the first voltage and the second voltage.

3. The method according to claim 1 or 2, characterized in that, The method further includes: Obtaining the mass of the target material; The determining the kinetic index of the target material according to the first voltage and the second voltage includes: Determining the kinetic index according to the first voltage, the second voltage, and the mass of the target material.

4. The method according to claim 3, wherein The determining the kinetic index according to the first voltage, the second voltage, and the mass of the target material includes: Determining the kinetic index according to the following formula: ΔEm = (E2 - E1) / m where E1 is the first voltage, E2 is the second voltage, m is the mass of the target material, and ΔEm is used to characterize the kinetic index.

5. The method according to any one of claims 1 to 4, characterized in that The first duration is less than the second duration.

6. The method according to any one of claims 1 to 5, characterized in that, There is an inverse relationship between the first duration and the first discharge rate.

7. The method according to any one of claims 1 to 6, characterized in that, The value range of the first discharge rate is 0.02C - 0.1C.

8. The method according to claim 7, wherein The value range of the first discharge rate is 0.04C - 0.08C.

9. The method according to any one of claims 1 to 8, characterized in that, When the discharge duration reaches the first duration, the value range of the SOC of the charge-discharge device is 50% - 55%.

10. The method according to any one of claims 1 to 9, characterized in that, Before obtaining the first voltage, the method further includes: Performing an activation process on the charge-discharge device.

11. The method according to claim 10, characterized in that, The performing an activation process on the charge-discharge device includes: Performing at least one charge-discharge on the charge-discharge device at a second charge-discharge rate, where the second charge-discharge rate is less than or equal to 0.1C.

12. The method according to claim 11, wherein The performing at least one charge-discharge on the charge-discharge device at a second charge-discharge rate includes: Performing charge-discharge on the charge-discharge device at the second charge-discharge rate in the order of static, discharge, static, charge, static, discharge, static.

13. The method according to any one of claims 1 to 12, characterized in that, The charge-discharge device is a button cell.

14. An apparatus for determining the kinetic index of a material, characterized in that, Including: An obtaining unit, configured to obtain a first voltage, where the first voltage is the voltage of the charge-discharge device when discharging the charge-discharge device at a first discharge rate and the discharge duration reaches a first duration, and the charge-discharge device includes a target material; The obtaining unit is further configured to obtain a second voltage, where the second voltage is the voltage of the charge-discharge device when the charge-discharge device is left static after discharging reaches the first duration and the static time reaches a second duration; A determining unit, configured to determine a kinetic index of the target material according to the first voltage and the second voltage.

15. The device according to claim 14, characterized in that, The determining unit is specifically configured to: Determine the kinetic index according to the difference between the first voltage and the second voltage.

16. The device according to claim 14 or 15, characterized in that, The obtaining unit is further configured to: Obtain the mass of the target material; The determining unit is specifically configured to: Determine the kinetic index according to the first voltage, the second voltage, and the mass of the target material.

17. The device according to claim 16, characterized in that, The determining unit is specifically configured to: Determine the kinetic index according to the following formula: ΔEm = (E2 - E1) / m Where E1 is the first voltage, E2 is the second voltage, m is the mass of the target material, and ΔEm is used to characterize the kinetic index.

18. The device according to any one of claims 14 to 17, characterized in that, The first duration is less than the second duration.

19. The device according to any one of claims 14 to 18, characterized in that, There is an inverse relationship between the first duration and the first discharge rate.

20. The device according to any one of claims 14 to 19, characterized in that The value range of the first discharge rate is 0.02C - 0.1C.

21. The device according to claim 20, characterized in that, The value range of the first discharge rate is 0.04C - 0.08C.

22. The device according to any one of claims 14 to 21, characterized in that, When the discharge duration reaches the first duration, the value range of the SOC of the charge-discharge device is 50% - 55%.

23. The device according to any one of claims 14 to 22, characterized in that, Before the obtaining unit obtains the first voltage, the device further includes: An activation unit for performing activation processing on the charge-discharge device.

24. The device according to claim 23, wherein The activation unit is specifically configured to: Perform at least one charge and discharge on the charge-discharge device at a second charge-discharge rate, where the second charge-discharge rate is less than or equal to 0.1C.

25. The device according to claim 24, characterized in that, The activation unit is specifically configured to: Perform charge and discharge on the charge-discharge device at the second charge-discharge rate in the order of static, discharge, static, charge, static, discharge, static.

26. The device according to any one of claims 14 to 25, characterized in that, The charge-discharge device is a button battery.

27. A device for determining the kinetic index of a material, characterized in that, Including: A memory for storing programs; A processor for executing the programs stored in the memory. When the programs stored in the memory are executed, the processor is used to execute the method for determining the kinetic index of the material according to any one of claims 1 to 12.

28. A computer-readable storage medium, characterized in that, For storing a computer program, the computer program causes a computer to execute the method for determining the kinetic index of the material according to any one of claims 1 to 12.

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