Battery charging rate determination method and device, electronic equipment and storage medium

Abstract

The invention provides a battery charging rate determination method and device, electronic equipment and a storage medium. The method comprises the following steps: obtaining a self-discharge current of a battery in each cycle charging process; the self-discharging current is the self-discharging current collected in the constant-voltage charging process when the battery is charged at a first charging rate in each circulating charging process until the electric quantity parameter of the battery reaches a preset electric quantity parameter and the battery is continuously charged in a constant-voltage charging mode; the values of the first charging multiplying power of the battery are different in different cyclic charging processes; and determining the corresponding maximum charging rate of the battery under the preset electric quantity parameter based on the self-discharging current. According to the embodiment of the invention, the maximum charging rate of the battery is determined based on the self-discharging current, and the battery is guided to be charged through the maximum charging rate, so that metal deposition in the battery can be reduced, and the risk of side reaction can be reduced while the charging efficiency of the battery is improved.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and in particular, to a method, device, electronic device, and storage medium for determining the charging rate of a battery. Background Art

[0002] A all-solid-state battery refers to a battery in which the electrolyte is solid, different from the traditional liquid electrolyte battery. During the charging process of the all-solid-state battery, a higher charging rate will accelerate the migration speed of lithium ions to the negative electrode. On the surface of the negative electrode, lithium ions are reduced and deposited to form lithium metal, making the distribution of lithium ions on the negative electrode uneven, thereby causing interface problems between the negative electrode and the solid electrolyte. Summary of the Invention

[0003] The purpose of the embodiments of the present application is to provide a method, device, electronic device, and storage medium for determining the charging rate of a battery, so as to determine the charging rate of an all-solid-state battery with a metal negative electrode, and reduce the risk of abnormal metal deposition.

[0004] In a first aspect, the embodiments of the present application provide a method for determining the charging rate of a battery, including: Obtaining the self-discharge current of the battery during each cycle charging process; the self-discharge current is the self-discharge current collected during the constant voltage charging process after charging the battery at a first charging rate until the battery's power parameter reaches a preset power parameter during each cycle charging process; the power parameter includes the battery voltage and / or the state of charge of the battery; wherein, for different cycle charging processes, the value of the first charging rate of the battery is different; Determining the maximum charging rate corresponding to the battery at the preset power parameter based on the self-discharge current; the maximum charging rate is the maximum value of the normal charging rate of the self-discharge current when the battery is charged to the preset power parameter.

[0005] By adopting different first charging rates during different cycle charging processes and monitoring the self-discharge current during the constant voltage charging stage, the embodiments of the present application determine the maximum charging rate of the battery based on the self-discharge current, and guide the battery charging through the maximum charging rate, which can reduce side reactions inside the battery (such as metal deposition and increased interfacial impedance), make the distribution of lithium ions on the negative electrode surface more uniform, and can reduce the risk of side reactions while improving the battery charging efficiency.

[0006] In a possible implementation manner of the first aspect, the method further includes: Obtaining the maximum charging rate corresponding to charging the battery to different preset power parameters; Generating a charging strategy corresponding to the battery according to the maximum charging rates corresponding to different preset power parameters.

[0007] In the embodiment of the present application, by means of the maximum charging rate corresponding to different preset power parameters, a phased and personalized charging strategy can be specified for the battery, making the charging process fast and stable, and reducing the low charging efficiency or potential safety hazards caused by too high or too low charging rates.

[0008] In a possible implementation manner of the first aspect, the first charging rate gradually increases with the number of cycles; determining the maximum charging rate corresponding to the battery under the preset power parameters based on the self-discharge current includes: Determining the number of cycles corresponding to the minimum charging rate with abnormal self-discharge current; Determining the charging rate corresponding to the maximum number of cycles less than the number of cycles as the maximum charging rate corresponding to the battery under the preset power parameters.

[0009] When obtaining the maximum charging rate corresponding to a certain preset power parameter in the embodiment of the present application, the value of the first charging rate is gradually tested from small to large until the self-discharge current becomes abnormal. Among them, when the first charging rate is small, the self-discharge current usually does not become abnormal. During the next cycle charging, the battery can still be used to test the next first charging rate, saving the test cost and being able to accurately determine the maximum charging rate.

[0010] In a possible implementation manner of the first aspect, the method further includes: Obtaining the first change curve of the normal self-discharge current corresponding to the preset power parameter over time, and obtaining the second change curve of the self-discharge current corresponding to the preset power parameter and the first charging rate over time; Calculating the difference degree between the first change curve and the second change curve; If the difference degree is greater than the preset value, it is determined that the self-discharge current corresponding to the second change curve is abnormal.

[0011] In the embodiment of the present application, by calculating the difference degree between the first change curve and the second change curve to determine whether there is an abnormal self-discharge current, the self-discharge behavior of the battery under different charging rates and power states can be accurately captured, thus providing a more accurate data basis for subsequent analysis and judgment.

[0012] In a possible implementation manner of the first aspect, calculating the difference degree between the first change curve and the second change curve includes: Selecting the corresponding first self-discharge current value from the first change curve based on the preset time point, and the second self-discharge current value corresponding to the second change curve; the preset time point is the time point when the first self-discharge current value and the second self-discharge current value reach a stable state; Determining the difference degree according to the difference between the first self-discharge current value and the second self-discharge current value.

[0013] In the embodiment of the present application, by selecting the current value at the time point when the self-discharge current reaches the steady state, the electrochemical reaction situation inside the battery can be more truly reflected, the misjudgment probability caused by current fluctuations or temporary interference factors is reduced, and the accuracy of determining the difference degree is improved.

[0014] In a possible implementation manner of the first aspect, the method further includes: Obtain the battery health state of the battery to be charged; Calculate the parameter offset corresponding to each preset power parameter in the charging strategy based on the battery health state; Determine the charging rate threshold of the battery to be charged according to the parameter offset.

[0015] In the embodiment of the present application, since the battery health state gradually decreases with the use of the battery, and the relationship between the charging cut-off power parameter and the charging rate in the charging strategy is for a new battery, therefore, the accuracy of determining the charging rate threshold of the battery to be charged can be improved through the parameter offset.

[0016] In a possible implementation manner of the first aspect, determining the maximum charging rate corresponding to the battery under the preset power parameter based on the self-discharge current includes: Obtain the charging parameters during the process of charging the battery to the cut-off voltage at the first charging rate; the charging parameters include at least one of charging duration, charging efficiency, battery temperature, battery internal resistance, and battery capacity retention rate; Input the self-discharge current and the charging parameters into the rate prediction model, and obtain the maximum charging rate output by the rate prediction model; the rate prediction model is pre-trained based on a machine learning algorithm.

[0017] In the embodiment of the present application, the rate prediction model is used to comprehensively analyze the self-discharge current and the charging parameters to realize the intelligent prediction of the maximum charging rate, so as to more accurately match the best charging rate of the battery in different states.

[0018] In the second aspect, the embodiment of the present application provides another method for determining the battery charging rate, including: Charge the battery in a loop at the first charging rate until the power parameter of the battery reaches the preset power parameter; the power parameter includes the battery voltage and / or the state of charge of the battery; in different loop charging processes, the value of the first charging rate is different; Charge the battery that has reached the preset power parameter in a constant voltage charging manner, and collect the self-discharge current of the battery during the constant voltage charging process; Determine the maximum charging rate corresponding to the battery under the preset power parameter based on the self-discharge current; the maximum charging rate is the maximum value of the normal charging rate of the self-discharge current when the battery is charged to the preset power parameter; Set different preset power parameters, and obtain the corresponding maximum charging rate under each preset power parameter according to the above steps; Generate a charging strategy for the battery according to the maximum charging rate corresponding to different preset power parameters.

[0019] In the embodiments of the present application, during different cyclic charging processes, different first charging rates are adopted, and the self-discharge current during the constant voltage charging stage is monitored. Based on the self-discharge current, the maximum charging rate of the battery is determined. By guiding the battery charging through the maximum charging rate, side reactions inside the battery (such as metal deposition) can be reduced, and while improving the battery charging efficiency, the risk of side reactions can be reduced.

[0020] In a third aspect, an apparatus for determining a battery charging rate provided by an embodiment of the present application includes: A current acquisition module for acquiring the self-discharge current of the battery during each cyclic charging process; the self-discharge current is the self-discharge current collected during the constant voltage charging process after charging the battery at a first charging rate until the power parameter of the battery reaches the preset power parameter during each cyclic charging process; the material of the negative electrode plate of the battery is metal, and the electrolyte of the battery is a solid electrolyte; the power parameter includes the battery voltage and / or the state of charge of the battery; A rate determination module for determining the maximum charging rate corresponding to the battery under the preset power parameter based on the self-discharge current; wherein, during different cyclic charging processes, the value of the first charging rate of the battery is different; the maximum charging rate is the maximum value of the normal charging rate of the self-discharge current when the battery is charged to the preset power parameter.

[0021] In a fourth aspect, an electronic device provided by an embodiment of the present application includes: a processor, a memory, and a bus, wherein: The processor and the memory communicate with each other through the bus; The memory stores program instructions executable by the processor, and the processor can execute the methods of the first aspect or the second aspect by invoking the program instructions.

[0022] In a fifth aspect, a non-transitory computer-readable storage medium provided by an embodiment of the present application includes: The non-transitory computer-readable storage medium stores computer instructions, and the computer instructions cause the computer to execute the methods in various possible implementation manners of the first aspect or the second aspect.

[0023] In a sixth aspect, a computer program product provided by an embodiment of the present application includes computer program instructions, and when the computer program instructions are read and run by a processor, the methods in various possible implementation manners of the first aspect or the second aspect are executed.

[0024] Other features and advantages of the present application will be described in the subsequent specification, and, in part, will become apparent from the specification or be understood by implementing the embodiments of the present application. The objectives and other advantages of the present application can be achieved and obtained by the structures specifically pointed out in the written specification, claims, and drawings. Brief Description of the Drawings

[0025] To more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments of the present application. It should be understood that the following drawings only show some embodiments of the present application and should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0026] Figure 1 Schematic flowchart of a method for determining the battery charging rate provided by an embodiment of the present application; Figure 2 Schematic flowchart of another method for determining the battery charging rate provided by an embodiment of the present application; Figure 3 Schematic diagram of the self-discharge current curve at different rates provided by an embodiment of the present application; Figure 4 Schematic structural diagram of a device for determining the battery charging rate provided by an embodiment of the present application; Figure 5 Schematic physical structure diagram of an electronic device provided by an embodiment of the present application. Detailed Embodiments

[0027] The following will describe in detail the embodiments of the technical solutions of the present application with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application and thus are only examples and should not be used to limit the protection scope of the present application.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "including" and "having" and any variations thereof in the specification and claims of the present application and the above description of the drawings are intended to cover non-exclusive inclusion.

[0029] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order, or primary-secondary relationship of the indicated technical features. In the description of the embodiments of the present application, "a plurality" means two or more unless otherwise specifically defined.

[0030] References to "embodiments" in this specification mean that the specific features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment each time, nor are they independent or alternative embodiments mutually exclusive of other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0031] In the description of the embodiments of the present application, the term "and / or" is merely a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. Additionally, the character " / " in this document generally represents an "or" relationship between the associated objects before and after.

[0032] In the description of the embodiments of the present application, the term "plurality" refers to two or more (including two). Similarly, "multiple groups" refers to two or more groups (including two groups), and "multiple pieces" refers to two or more pieces (including two pieces).

[0033] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "coupling", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0034] The all-solid-state battery with a metal negative electrode is a new type of battery system. Among them, an all-solid-state battery means that the electrolyte in the battery is solid, which is different from the traditional liquid electrolyte battery. A metal negative electrode means that the negative electrode material uses a metal, such as lithium, sodium, etc. Taking lithium metal as an example, the working principle of the all-solid-state battery with a metal negative electrode is mainly based on the redox reaction of lithium metal. During charging, lithium ions are extracted from the positive electrode material and embedded in the negative electrode through the solid electrolyte to form metallic lithium; during discharging, metallic lithium undergoes an oxidation reaction and lithium ions return to the positive electrode material again.

[0035] The metal anode-based all-solid-state battery includes an anode, a solid electrolyte, and a cathode. Among them, the metal anode can directly serve as the anode of the battery, and a solid electrolyte interface (SEI) film will form on its surface. This SEI film has an important impact on the performance of the battery. It can prevent the direct contact between lithium metal and the solid electrolyte and thus avoid side reactions. However, during the cycling process, the stability of the SEI film is a key issue. If the SEI film is unstable, it will lead to uneven deposition of lithium ions and the formation of lithium dendrites. The solid electrolyte is one of the core components of the all-solid-state battery. Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes. Common polymer solid electrolytes can be polyethers (polyethylene oxide), polysiloxanes, polycarbonates, polyacrylonitriles, polyvinylidene fluorides, polymethyl methacrylate, single-ion polymers, polyionic liquid-lithium salts, cellulose, etc. Inorganic solid electrolytes can include oxide solid electrolytes (crystalline perovskites, sodium superionic conductors, garnets, amorphous LiPON films), sulfide solid electrolytes (crystalline lithium superionic conductors (lithium germanium phosphorus sulfur, argyrodite), amorphous sulfides), as well as one or more of halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes. Composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0036] The battery mentioned 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.

[0037] In some embodiments, the battery can be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0038] In some embodiments, the battery can be a battery pack. The battery pack includes a box body and battery cells, and the battery cells or battery modules are accommodated in the box body.

[0039] In some embodiments, the box body can be part of the chassis structure of a vehicle. For example, part of the box body can become at least part of the floor of the vehicle, or part of the box body can become at least part of the crossbeam and longitudinal beam of the vehicle.

[0040] In some embodiments, the battery can be an energy storage device. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0041] The battery cells described in the embodiments of this application are applicable to batteries and electrical devices using the battery cells.

[0042] The electrical equipment can be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, etc. The vehicle 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 electric vehicle or an extended-range electric vehicle, etc.; the spacecraft includes an airplane, a rocket, a space shuttle, a spaceship, etc.; the electric toy includes a fixed 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 grinding wheel, an electric wrench, an electric screwdriver, a hammer drill, an impact electric drill, a concrete vibrator and a planer, etc. The embodiments of the present application do not impose special restrictions on the above electrical equipment. For the convenience of description in the following embodiments, the electrical equipment is taken as an example of a vehicle for illustration.

[0043] The all-solid-state battery of the metal negative electrode type in the embodiments of the present application can be a secondary battery, and a secondary battery refers to a battery that can activate the active material and continue to be used by charging the battery at a certain charging rate after the battery discharges.

[0044] The charging rate is a parameter used to describe how much charge can be charged into the battery within a certain period of time. Generally, the higher the charging rate, the greater the current during charging. A higher charging rate will accelerate the migration speed of lithium ions to the negative electrode. On the surface of the metal negative electrode, lithium ions are reduced and deposited to form metallic lithium. If the charging rate is too high, the deposition rate of lithium ions may exceed their diffusion rate on the surface of the metal negative electrode, resulting in local accumulation of lithium ions on the negative electrode surface, thereby exacerbating the growth of lithium dendrites.

[0045] Therefore, an appropriate charging rate can extend the service life of the battery. Currently, when charging an all-solid-state battery of the metal negative electrode type, if the charging rate is too large, it will cause the problem of uneven lithium ion distribution in the metal-based negative electrode of the battery, and even the phenomenon of abnormal metal deposition, thereby forming metal dendrites. When the metal dendrites grow into the electrolyte layer, a micro short circuit occurs between the positive and negative electrodes, thereby triggering abnormal self-discharge of the battery. For the charging of an all-solid-state battery of the non-metal negative electrode type, if the charging rate is too large, the reduced lithium ions cannot be completely embedded in the negative electrode, and metallic lithium is formed by reduction on the surface of the negative electrode, resulting in the growth of metal dendrites into the electrolyte layer, and finally a micro short circuit occurs. The embodiments of the present application provide a method for determining the charging rate of a battery. By charging the battery to a certain cut-off voltage at different charging rates respectively, and then performing constant voltage charging on the battery with the open circuit voltage, and collecting the self-discharge current during the constant voltage charging process, the maximum charging rate of the battery at the charging cut-off voltage is determined by analyzing whether the self-discharge current is abnormal, so as to guide the charging rate of the battery during subsequent use, reduce the risk of metal deposition, and improve the safety of the battery.

[0046] It should be noted that the method for determining the battery charging rate provided in the embodiments of the present application is applicable to batteries with liquid electrolytes, semi-solid electrolytes, and solid electrolytes. Among them, taking a all-solid-state battery as an example, there is a problem of uneven distribution of lithium ions at the negative electrode. This is because the ion migration path of the solid electrolyte is fixed and cannot relieve the problem of excessive local lithium ion concentration like a liquid electrolyte. The uneven distribution of lithium ions at the negative electrode may cause negative impacts such as local overcharging and interface problems between the negative electrode and the solid electrolyte. For the convenience of description, in the following embodiments, metallic lithium is taken as an example of the battery negative electrode for description.

[0047] Figure 1 It is a schematic flow chart of a method for determining the battery charging rate provided in the embodiments of the present application. As Figure 1 shown, the method includes: Step 101: Obtain the self-discharge current of the battery during each cycle charging process; the self-discharge current is the self-discharge current collected during the constant voltage charging process after charging the battery at a first charging rate until the battery's power parameter reaches a preset power parameter during each cycle charging process; the power parameter includes the battery voltage and / or the state of charge of the battery; among them, for different cycle charging processes, the value of the first charging rate of the battery is different; Step 102: Determine the maximum charging rate corresponding to the battery at the preset power parameter based on the self-discharge current; the maximum charging rate is the maximum value of the normal charging rate of the self-discharge current when the battery is charged to the preset power parameter.

[0048] In a specific implementation process, the battery can be a fresh battery that has not been used. The battery is cyclically charged and discharged, and the self-discharge current in each cycle is obtained. Among them, the self-discharge current refers to the discharge current spontaneously generated inside the battery when the battery is not connected to an external circuit or has no external load. The generation of the self-discharge current is often accompanied by the spontaneous migration of lithium ions inside the battery. If the lithium ions are unevenly distributed on the surface of the negative electrode, it may lead to excessive local lithium ion concentration. In the high-concentration area, lithium ions are easily reduced and deposited on the surface of the negative electrode to form metallic lithium, that is, the phenomenon of lithium deposition occurs.

[0049] The following describes a single cycle of charge and discharge: (1) Charge the battery at a first charging rate so that the power parameter of the battery reaches the preset power parameter. Among them, the power parameter is a key index to measure the charging state of the battery. For example, it can be the battery voltage or the state of charge of the battery, etc. For the convenience of description, in the following, the power parameter is taken as the battery voltage for introduction.

[0050] (2) Since there is a polarization reaction inside the battery just after charging, the battery can be left standing for a period of time, for example, it can be left standing for 2 minutes. The specific standing time can be set according to actual needs, and the embodiments of the present application do not make specific limitations on this.

[0051] (3) The voltage of the battery after standing will be lower than the voltage of the battery just after charging in step (1). Therefore, the battery can be charged again. It can be understood that this charging can be carried out at a small rate, for example, it can be carried out at 0.1C, 0.2C, etc. The purpose of charging at a small rate is to reduce the polarization inside the battery.

[0052] (4) Leave the battery standing again. This time, the standing time can be a little longer, for example, it can be left standing for 3 hours, or it can be left standing for 3.5 hours or 2.5 hours. The purpose is to make the battery reach a stable state.

[0053] (5) Charge the battery again by means of constant voltage charging. The charging voltage is the open-circuit voltage of the battery, and the self-discharge current during the constant voltage charging process is collected. It should be noted that the battery can be charged for 3 hours in the constant voltage charging mode, and the self-discharge current during the constant voltage charging process is collected at a preset collection interval. In addition, the duration of the constant voltage charging can also be set according to actual needs. Its main purpose is to obtain a stable self-discharge current. Therefore, if the self-discharge current of the battery stabilizes quickly, the duration of the constant voltage charging can be reduced; if the self-discharge current of the battery stabilizes slowly, the duration of the constant voltage charging can be appropriately increased. The method for judging whether the self-discharge current is stable can be to judge the change rate of the self-discharge current with time. When the change rate is less than the preset value, it indicates that the self-discharge current tends to be stable.

[0054] It should be noted that in each cycle, the value of the first charging rate in step (1) is different. Therefore, under the condition of the same preset power parameters, the self-discharge current values corresponding to different first charging rates can be obtained. For the convenience of testing, it can be set that the first charging rate gradually increases with the number of cycles. In the embodiments of the present application, the reason for using the self-discharge current during the constant voltage charging process is to exclude the interference caused by different charging rates.

[0055] After obtaining the self-discharge current values corresponding to different first charging rates, the maximum value of the first charging rate with normal self-discharge current can be determined therefrom, and the maximum value of the first charging rate is used as the maximum charging rate. It should be noted that the method for judging whether the self-discharge current is normal can be to preset the normal value range of the self-discharge current. If the self-discharge current that tends to be stable is within this normal value range, it indicates that the self-discharge current is normal; if it exceeds the normal value range, it indicates that the self-discharge current is abnormal. Of course, other judgment methods can also be used, and the embodiments of the present application do not make specific limitations on this.

[0056] It should be noted that before testing the maximum charging rate of the battery under each preset power parameter, the capacity of the battery can be tested. Specifically, the battery is charged at a small rate to the upper voltage limit, and then discharged at a small rate to the lower voltage limit. Based on the charging and discharging current and duration, the capacity of the battery can be determined.

[0057] In the embodiment of the present application, by adopting different first charging rates during different cyclic charging processes and monitoring the self-discharge current during the constant voltage charging stage, the maximum charging rate of the battery is determined based on the self-discharge current. Guiding the battery charging through the maximum charging rate can reduce side reactions (such as metal deposition) inside the battery, and can reduce the risk of side reactions while improving the battery charging efficiency.

[0058] Based on the above embodiment, the method further includes: Obtaining the maximum charging rate corresponding to different preset power parameters for charging the battery; Generating a charging strategy corresponding to the battery according to the maximum charging rate corresponding to different preset power parameters.

[0059] In the specific implementation process, different preset power parameters can be set, and the self-discharge current corresponding to different first charging rates under different preset power parameters is obtained in the manner of steps (1)-(5) in the above embodiment. Then, based on the self-discharge current, the maximum charging rate corresponding to each preset power parameter can be determined.

[0060] Generating a charging strategy corresponding to the battery according to the maximum charging rate corresponding to different preset power parameters can be specifically presented in the form of a table. The charging strategy can include the maximum charging rate corresponding to each preset power parameter. For example: it can be the correspondence between the state of charge (SOC) of the battery and the maximum charging rate.

[0061] It should be noted that after each test of the maximum charging rate corresponding to a preset power parameter is completed, a new battery needs to be replaced to perform the test of the next preset power parameter. This is because the test of each preset power parameter will cause the battery to stop due to abnormal self-discharge. In order not to interfere with the test of the next preset power parameter, the battery needs to be replaced.

[0062] In the embodiment of the present application, through the maximum charging rate corresponding to different preset power parameters, a phased and personalized charging strategy can be specified for the battery, making the charging process fast and stable, and reducing the charging inefficiency or safety hazards caused by too high or too low charging rate.

[0063] Based on the above embodiment, the first charging rate gradually increases with the number of cycles; determining the maximum charging rate corresponding to the battery under the preset power parameter based on the self-discharge current includes: Determine the number of cycles corresponding to the minimum charge rate with abnormal self-discharge current; Determine the maximum charge rate corresponding to the battery under the preset power parameters as the charge rate corresponding to the maximum number of cycles less than the number of cycles.

[0064] In a specific implementation process, at the initial stage of each cycle charging, the battery is charged at a first charge rate. The first charge rate gradually increases with the number of cycles. For example, in the initial cycle, a lower charge rate (such as 0.5C) can be used, and as the number of cycles increases, the charge rate is gradually increased (such as 1C, 2C, etc.). And, since the possibility of abnormal self-discharge is relatively small during low-rate charging, therefore, during low-rate charging, a relatively large difference in the charge rate corresponding to adjacent two cycles can be set. While during high-rate charging, the possibility of abnormal self-discharge current is relatively large. At this time, a relatively small difference in the charge rate corresponding to adjacent two cycles can be set. That is, the specific value of the first charge rate can increase with the increase of the number of cycles, and the difference in the charge rate between adjacent two cycles can decrease with the increase of the number of cycles. In this way, on the one hand, the test efficiency can be improved to quickly determine the maximum charge rate; on the other hand, the maximum charge rate can be determined more accurately.

[0065] Since the first charge rate gradually increases, therefore, after determining the first charge rate corresponding to the start of abnormal self-discharge current, the charge rate that is the second smallest compared to this first charge rate can be used as the maximum charge rate. For example: in the 49th cycle, the value of the first charge rate is 2.3C, and at this time the self-discharge current is normal; in the 50th cycle, the value of the first charge rate is 2.4C, and at this time the self-discharge current is abnormal. Then 2.3C is used as the maximum charge rate.

[0066] When obtaining the maximum charge rate corresponding to a certain preset power parameter in the embodiment of the present application, the value of the first charge rate is gradually tested from small to large until the self-discharge current becomes abnormal. Among them, when the first charge rate is relatively small, the self-discharge current usually does not become abnormal. When performing the next cycle charging, this battery can still be used to test the next first charge rate, saving the test cost and being able to accurately determine the maximum charge rate.

[0067] Based on the above embodiments, the method further includes: Obtain the first change curve of the normal self-discharge current with time corresponding to the preset power parameter, and obtain the second change curve of the self-discharge current with time corresponding to the preset power parameter and the first charge rate; Calculate the difference degree between the first change curve and the second change curve; If the difference degree is greater than the preset value, it is determined that the self-discharge current corresponding to the second change curve is abnormal.

[0068] In a specific implementation process, the normal self-discharge current corresponding to different preset power parameters can be tested in advance. In the embodiments of the present application, taking different charging cut-off voltages as an example, the specific process is as follows: Charge the battery at a small rate (e.g., less than 1C) so that the voltage of the battery reaches the preset charging cut-off voltage. After standing, perform constant-voltage charging for a preset duration at the open-circuit voltage, and collect the self-discharge current during the constant-voltage charging process. Since charging at a small rate usually does not cause abnormal metal deposition, the obtained self-discharge current is the normal self-discharge current.

[0069] Execute the above method in a loop with different charging cut-off voltages until the normal self-discharge currents corresponding to all charging cut-off voltages are obtained. It should be noted that the interval between the charging cut-off voltages can be set according to the actual situation. For example, the above loop can be executed every 0.1V until the maximum charging cut-off voltage is reached. Among them, the value of the maximum charging cut-off voltage is determined according to the battery, and different batteries may have different maximum charging cut-off voltages. In addition, since multiple self-discharge currents will be collected during the constant-voltage charging process, a change curve of the self-discharge current over time, that is, the first change curve, can be formed based on the multiple self-discharge currents. Each charging cut-off voltage corresponds to a first change curve, and this first change curve can be used as a curve with normal self-discharge current.

[0070] When determining the maximum charging rate of the battery, obtain a second change curve of the self-discharge current over time when the battery is charged to the preset power parameter at the first charging rate. It can be understood that the generation method of the second change curve is similar to that of the first change curve.

[0071] Calculate the difference degree between the first change curve and the second change curve. Among them, the method for calculating the difference degree can adopt the Manhattan distance method, the Euclidean distance method, the method based on curve fitting (e.g., the least squares method), the method based on dynamic time warping, etc.

[0072] If the difference degree is greater than the preset value, it means that the two curves differ greatly, and it is determined that the self-discharge current corresponding to the second change curve is abnormal; on the contrary, if the difference degree is not greater than the preset value, it means that the two curves differ little, and it is determined that the self-discharge current corresponding to the second change curve is normal.

[0073] In the embodiments of the present application, by calculating the difference degree between the first change curve and the second change curve to determine whether there is an abnormal self-discharge current, the self-discharge behavior of the battery under different charging rates and power states can be accurately captured, thereby providing a more accurate data basis for subsequent analysis and judgment.

[0074] Based on the above embodiments, calculating the difference degree between the first change curve and the second change curve includes: Selecting the corresponding first self-discharge current value from the first change curve and the corresponding second self-discharge current value from the second change curve based on a preset time point; the preset time point is the time point when the first self-discharge current value and the second self-discharge current value reach a stable state; Determining the difference degree according to the difference between the first self-discharge current value and the second self-discharge current value.

[0075] In a specific implementation process, as the constant voltage charging progresses, the self-discharge current gradually tends to be stable. By collecting the self-discharge current values corresponding to the same time point after stabilization from the first change curve and the second change curve respectively, the first self-discharge current value corresponding to the first change curve and the second self-discharge current value corresponding to the second change curve can be obtained.

[0076] Calculating the difference between the first self-discharge current value and the second self-discharge current value. If the difference is greater than a preset difference, it indicates that the second self-discharge current value is abnormal; conversely, if the difference is not greater than the preset difference, it indicates that the second self-discharge current value is normal.

[0077] By selecting the current value at the time point when the self-discharge current reaches a stable state in the embodiments of the present application, the electrochemical reaction situation inside the battery can be more truly reflected, reducing the misjudgment probability caused by current fluctuations or temporary interference factors and improving the accuracy of determining the difference degree.

[0078] Based on the above embodiments, the method further includes: Obtaining the state of health (SOH) of the battery to be charged; Calculating the parameter offset corresponding to each preset power parameter in the charging strategy based on the battery state of health; Determining the charging rate threshold of the battery to be charged according to the parameter offset.

[0079] In a specific implementation process, the battery to be charged can be an unused battery or a used battery. Among them, the state of health (SOH) of an unused battery is usually 100%, while the SOH of a used battery may be less than 100%. In order to obtain the charging rate threshold corresponding to the current to be charged, the maximum charging rate corresponding to the battery to be charged when it is charged to the corresponding state of charge (SOC) can be determined based on the SOH of the battery to be charged and the charging strategy. For example: the maximum charging rate corresponding to 80% SOC in the charging strategy is 3C, and the SOH of the battery to be charged is 90%. Then the parameter offset = 80% - 80% * 90%, that is, the parameter offset is 8%. Then the maximum charging rate corresponding to 72% SOC of this battery to be charged is 3C.

[0080] In the embodiments of the present application, since the battery health state gradually decreases as the battery is used, and the relationship between the charge cut-off power parameter and the charge rate in the charging strategy is for a new battery, therefore, the accuracy of determining the charge rate threshold of the battery to be charged can be improved through the parameter offset.

[0081] Based on the above embodiments, determining the maximum charge rate corresponding to the battery at the preset power parameter based on the self-discharge current includes: Obtain the charging parameters during the process of charging the battery to the cut-off voltage at the first charge rate; the charging parameters include at least one of the charging duration, charging efficiency, battery temperature, battery internal resistance, and battery capacity retention rate. Input the self-discharge current and the charging parameters into the rate prediction model to obtain the maximum charge rate output by the rate prediction model; the rate prediction model is pre-trained based on a machine learning algorithm.

[0082] In the specific implementation process, the charging duration refers to the time recorded for the battery to be charged from the initial state to the cut-off voltage, and the charging duration reflects the charging speed of the battery at a specific charge rate.

[0083] The charging efficiency is calculated as the ratio of the input power during the charging process to the actual stored power of the battery, and the charging efficiency reflects the effective utilization degree of the input energy by the battery.

[0084] The battery temperature refers to the temperature condition of the battery during the charging process, and the battery temperature is one of the key factors affecting the battery performance and safety.

[0085] The battery capacity retention rate is used to record the capacity retention situation of the battery after multiple cycles. The capacity retention rate is an important indicator for evaluating the degree of battery aging.

[0086] Before using the rate prediction model for prediction, model training can be performed first, and the specific method is as follows: Collect a large amount of charging data of batteries under different charge rates and different battery states, including the self-discharge current and the above-mentioned charging parameters. Perform preprocessing operations such as cleaning and normalization on these data to improve the training effect of the model.

[0087] According to the characteristics of the problem and the nature of the data, select a suitable machine learning algorithm to construct the rate prediction model. Common algorithms include neural networks, support vector machines, random forests, etc.

[0088] Input the preprocessed data into the selected machine learning algorithm for training. By adjusting the parameters of the model, the model can accurately predict the maximum charge rate under the given self-discharge current and charging parameters.

[0089] After obtaining the trained model, the self-discharge current and charging parameters of the current battery are input into the trained rate prediction model. Based on the input data, the model outputs the corresponding predicted maximum charging rate. The maximum charging rate is the highest rate that can charge the battery to the preset power parameter under the premise of safety.

[0090] In the embodiment of the present application, the rate prediction model is used to comprehensively analyze the self-discharge current and charging parameters to realize the intelligent prediction of the maximum charging rate, so as to more accurately match the optimal charging rate of the battery in different states.

[0091] Figure 2 It is a schematic flow chart of another method for determining the battery charging rate provided by the embodiment of the present application. As Figure 2 shown, the method includes: Step 201: Charge the battery at the first charging rate so that the power parameter of the battery reaches the preset power parameter; the power parameter includes the battery voltage and / or the state of charge of the battery; it should be noted that after charging the battery to reach the preset power parameter at the first charging rate, the battery can be left standing for a period of time and then charged at a small rate again to make its power parameter reach the preset power parameter again.

[0092] Step 202: Charge the battery that has reached the preset power parameter in a constant voltage charging manner, and collect the self-discharge current of the battery during the constant voltage charging process; it should be noted that before adopting the constant voltage charging, the battery can be left standing for a period of time, for example, it can be left standing for 3 hours, etc., to reduce the interference caused by internal polarization of the battery.

[0093] Step 203: Determine whether the self-discharge current is normal; if it is normal, discharge the battery to the voltage lower limit, and re-execute Step 201, and modify the value of the first charging rate. Specifically, the value of the first charging rate can be gradually increased according to the number of cycles; if it is not normal, execute Step 204; Step 204: Take the first charging rate in the previous cycle as the maximum charging rate.

[0094] Step 205: Determine whether the maximum power parameter is reached, for example, the voltage upper limit is reached; if the voltage upper limit is reached, end; otherwise, re-execute Step 201, and update the first charging rate and the preset power parameter in Step 201. Specifically, the first charging rate is updated to the minimum rate, for example, 0.1C, and the specific minimum rate is set according to actual needs. The preset power parameter can be gradually increased with the number of cycles. It should be noted that when re-executing Step 201, a new battery needs to be replaced, and the battery parameters of the batteries participating in the test should be kept consistent.

[0095] It should be noted that devices such as an electrochemical workstation can be used to charge and discharge the battery, and collect the self-discharge current of the battery. The upper computer is used to judge whether the self-discharge current is abnormal and determine the maximum charging rate. Of course, the charging and discharging of the battery, the collection of the self-discharge current, the abnormal judgment of the self-discharge current, and the determination of the maximum charging rate can also be realized by the same device.

[0096] Figure 3 FIG. is a schematic diagram of the self-discharge current curve at different rates provided by an embodiment of the present application. The first charging rates are C1, C2, and C3 respectively, where C1 < C2 < C3. The self-discharge current measured using rate C1 is smaller. After charging with rate C2, the measured self-discharge current is basically the same as that of C1, indicating that there is no abnormality in the charging of the battery cell at rate C2. After charging with rate C3, the measured self-discharge current increases significantly, indicating that lithium deposition abnormality occurs during charging of the battery cell at rate C3, resulting in abnormal self-discharge of the battery cell.

[0097] By monitoring the self-discharge current in the embodiment of the present application, the abnormality at the end of the battery can be effectively monitored, so as to specify the charging window of the all-solid-state battery with a metal negative electrode.

[0098] Figure 4 FIG. is a schematic structural diagram of a device for determining the charging rate of a battery provided by an embodiment of the present application. The device can be a module, a program segment, or code on an electronic device. It should be understood that the device corresponds to the above Figure 1 method embodiment and can execute Figure 1 each step involved in the method embodiment. The specific functions of the device can be referred to the description above. To avoid repetition, the detailed description is appropriately omitted here. The device includes: a current acquisition module 401 and a rate determination module 402, where: The current acquisition module 401 is used to obtain the self-discharge current of the battery during each cycle charging process; the self-discharge current is the self-discharge current collected during the constant voltage charging process after charging the battery at the first charging rate until the battery's power parameter reaches a preset power parameter during each cycle charging process; the material of the negative electrode plate of the battery is metal, and the electrolyte of the battery is a solid electrolyte; the power parameter includes the battery voltage and / or the state of charge of the battery; The rate determination module 402 is used to determine the maximum charging rate corresponding to the battery at the preset power parameter based on the self-discharge current; where, for different cycle charging processes, the value of the first charging rate of the battery is different; the maximum charging rate is the maximum value of the charging rates with normal self-discharge current when the battery is charged to the preset power parameter.

[0099] On the basis of the above embodiment, the device further includes a charging strategy generation module for: Obtain the maximum charging rate corresponding to different preset power parameters for charging the battery; Generate a charging strategy for the battery according to the maximum charging rate corresponding to different preset power parameters.

[0100] Based on the above embodiments, the first charging rate gradually increases with the number of cycles; the rate determination module 402 is specifically configured to: Determine the number of cycles corresponding to the minimum charging rate with abnormal self-discharge current; Determine the charging rate corresponding to the maximum number of cycles less than the number of cycles as the maximum charging rate corresponding to the battery at the preset power parameter.

[0101] Based on the above embodiments, the device further includes an abnormality detection module for: Obtain the first change curve of the normal self-discharge current corresponding to the preset power parameter over time, and obtain the second change curve of the self-discharge current corresponding to the preset power parameter and the first charging rate over time; Calculate the difference degree between the first change curve and the second change curve; If the difference degree is greater than a preset value, determine that the self-discharge current corresponding to the second change curve is abnormal.

[0102] Based on the above embodiments, the abnormality detection module is specifically configured to: Select a corresponding first self-discharge current value from the first change curve based on a preset time point, and a second self-discharge current value corresponding to the second change curve; the preset time point is the time point when the first self-discharge current value and the second self-discharge current value reach a stable state; Determine the difference degree according to the difference between the first self-discharge current value and the second self-discharge current value.

[0103] Based on the above embodiments, the device further includes a rate threshold determination module for: Obtain the battery health state of the battery to be charged; Calculate the parameter offset corresponding to each preset power parameter in the charging strategy based on the battery health state; Determine the charging rate threshold of the battery to be charged according to the parameter offset.

[0104] Based on the above embodiments, the rate determination module 402 is specifically configured to: Obtain the charging parameters during the process of charging the battery to the cut-off voltage at the first charging rate; the charging parameters include at least one of charging duration, charging efficiency, battery temperature, battery internal resistance, and battery capacity retention rate; Input the self-discharge current and the charging parameters into the rate prediction model to obtain the maximum charging rate output by the rate prediction model; the rate prediction model is pre-trained based on a machine learning algorithm.

[0105] Figure 5 FIG. is a schematic structural diagram of an electronic device entity provided by an embodiment of the present application, as Figure 5 shown, the electronic device includes: a processor 501, a memory 502, and a bus 503; wherein: The processor 501 and the memory 502 complete communication with each other through the bus 503; The processor 501 is configured to call program instructions in the memory 502 to execute the methods provided in the foregoing method embodiments, for example, including: obtaining the self-discharge current of the battery during each cycle charging process; the self-discharge current is during each cycle charging process, charging the battery at a first charging rate until the power parameter of the battery reaches a preset power parameter, continuing to charge in a constant voltage charging manner, and collecting the self-discharge current during the constant voltage charging process; the power parameter includes the battery voltage and / or the state of charge of the battery; wherein, for different cycle charging processes, the value of the first charging rate of the battery is different; determining the maximum charging rate corresponding to the battery at the preset power parameter based on the self-discharge current; the maximum charging rate is the maximum value of the normal charging rate of the self-discharge current when the battery is charged to the preset power parameter.

[0106] The processor 501 may be an integrated circuit chip with signal processing capabilities. The foregoing processor 501 may be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it may also be a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components. It can implement or execute 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.

[0107] The memory 502 may include, but is not limited to, a Random Access Memory (RAM), a Read Only Memory (ROM), a Programmable Read-Only Memory (PROM), an Erasable Programmable Read-Only Memory (EPROM), an Electrically Erasable Programmable Read-Only Memory (EEPROM), etc.

[0108] This embodiment discloses a computer program product. The computer program product includes a computer program stored on a non-transitory computer-readable storage medium. The computer program includes program instructions. When the program instructions are executed by a computer, the computer can execute the methods provided in the above method embodiments, for example, including: Obtain the self-discharge current of the battery during each cycle charging process; the self-discharge current is the self-discharge current collected during the constant voltage charging process after charging the battery at a first charging rate until the battery's power parameter reaches a preset power parameter during each cycle charging process; the power parameter includes the battery voltage and / or the state of charge of the battery; wherein, for different cycle charging processes, the value of the first charging rate of the battery is different; determine the maximum charging rate corresponding to the battery at the preset power parameter based on the self-discharge current; the maximum charging rate is the maximum value of the charging rates with normal self-discharge current when the battery is charged to the preset power parameter.

[0109] This embodiment provides a non-transitory computer-readable storage medium. The non-transitory computer-readable storage medium stores computer instructions. The computer instructions cause the computer to execute the methods provided in the above method embodiments, for example, including: Obtain the self-discharge current of the battery during each cycle charging process; the self-discharge current is the self-discharge current collected during the constant voltage charging process after charging the battery at a first charging rate until the battery's power parameter reaches a preset power parameter during each cycle charging process; the power parameter includes the battery voltage and / or the state of charge of the battery; wherein, for different cycle charging processes, the value of the first charging rate of the battery is different; determine the maximum charging rate corresponding to the battery at the preset power parameter based on the self-discharge current; the maximum charging rate is the maximum value of the charging rates with normal self-discharge current when the battery is charged to the preset power parameter.

[0110] In the embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. The device embodiments described above are merely illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For another example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed coupling or direct coupling or communication connection between each other can be through some communication interfaces. The indirect coupling or communication connection of the devices or units can be in an electrical, mechanical or other form.

[0111] In addition, the units described as separate components may or may not be physically separated. The components displayed as units may or may not be physical units, that is, they can be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0112] Furthermore, in each embodiment of the present application, the various functional modules can be integrated together to form an independent part, or each module can exist alone, or two or more modules can be integrated to form an independent part.

[0113] In this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations.

[0114] The above are only the embodiments of the present application and are not used to limit the protection scope of the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for determining the charging rate of a battery, characterized in that, The method includes: Obtaining the self-discharge current of the battery during each cycle charging process; the self-discharge current is the self-discharge current collected during the constant voltage charging process after charging the battery at a first charging rate until the battery's power parameter reaches a preset power parameter during each cycle charging process; the power parameter includes battery voltage and / or state of charge of the battery; wherein, for different cycle charging processes, the value of the first charging rate of the battery is different; Determining the maximum charging rate corresponding to the battery at the preset power parameter based on the self-discharge current; the maximum charging rate is the maximum value of the normal charging rate of the self-discharge current when the battery is charged to the preset power parameter.

2. The method according to claim 1, wherein The method further includes: Obtaining the maximum charging rates corresponding to charging the battery to different preset power parameters; Generating a charging strategy corresponding to the battery according to the maximum charging rates corresponding to different preset power parameters.

3. The method according to claim 1, wherein The first charging rate gradually increases with the number of cycles; the determining the maximum charging rate corresponding to the battery at the preset power parameter based on the self-discharge current includes: Determining the number of cycles corresponding to the minimum charging rate with abnormal self-discharge current; Determining the charging rate corresponding to the maximum number of cycles less than the number of cycles as the maximum charging rate corresponding to the battery at the preset power parameter.

4. The method according to claim 3, wherein The method further includes: Obtaining a first change curve of the normal self-discharge current corresponding to the preset power parameter over time, and obtaining a second change curve of the self-discharge current corresponding to the preset power parameter and the first charging rate over time; Calculating the difference degree between the first change curve and the second change curve; If the difference degree is greater than a preset value, determining that the self-discharge current corresponding to the second change curve is abnormal.

5. The method according to claim 4, characterized in that, The calculating the difference degree between the first change curve and the second change curve includes: Selecting a corresponding first self-discharge current value from the first change curve and a second self-discharge current value corresponding to the second change curve based on a preset time point; the preset time point is the time point when the first self-discharge current value and the second self-discharge current value reach a stable state; Determining the difference degree according to the difference between the first self-discharge current value and the second self-discharge current value.

6. The method according to claim 2, wherein The method further includes: Obtaining the battery health state of the battery to be charged; Calculating a parameter offset corresponding to each preset power parameter in the charging strategy based on the battery health state; Determining a charging rate threshold for the battery to be charged according to the parameter offset.

7. The method according to any one of claims 1-6, characterized in that, The determining the maximum charging rate corresponding to the battery at the preset power parameter based on the self-discharge current includes: Obtaining the charging parameters during the process of charging the battery to the cut-off voltage at the first charging rate; the charging parameters include at least one of charging duration, charging efficiency, battery temperature, battery internal resistance, and battery capacity retention rate; Input the self-discharge current and the charging parameters into the rate prediction model to obtain the maximum charging rate output by the rate prediction model; the rate prediction model is pre-trained based on a machine learning algorithm.

8. A method for determining the battery charging rate, characterized in that, The method includes: Charge the battery in a loop using a first charging rate until the power parameter of the battery reaches a preset power parameter; the power parameter includes battery voltage and / or state of charge of the battery; in different loop charging processes, the value of the first charging rate is different; Charge the battery that has reached the preset power parameter in a constant voltage charging manner, and collect the self-discharge current of the battery during the constant voltage charging process; Determine the maximum charging rate corresponding to the battery at the preset power parameter based on the self-discharge current; the maximum charging rate is the maximum value of the charging rates with normal self-discharge current when the battery is charged to the preset power parameter; Set different preset power parameters, and obtain the maximum charging rate corresponding to each preset power parameter according to the above steps; Generate a charging strategy corresponding to the battery according to the maximum charging rates corresponding to different preset power parameters.

9. A device for determining the charging rate of a battery, characterized in that Includes: A current acquisition module for acquiring the self-discharge current of the battery during each loop charging process; The self-discharge current is the self-discharge current collected during the constant voltage charging process after charging the battery at a first charging rate until the power parameter of the battery reaches a preset power parameter in each loop charging process; the material of the negative electrode plate of the battery is metal, and the electrolyte of the battery is a solid electrolyte; the power parameter includes battery voltage and / or state of charge of the battery; A rate determination module for determining the maximum charging rate corresponding to the battery at the preset power parameter based on the self-discharge current; wherein, in different loop charging processes, the value of the first charging rate of the battery is different; The maximum charging rate is the maximum value of the charging rates with normal self-discharge current when the battery is charged to the preset power parameter.

10. An electronic device, characterized in that, Includes: A processor, a memory, and a bus, where: The processor and the memory complete communication with each other through the bus; The memory stores program instructions that can be executed by the processor, and the processor can execute the method according to any one of claims 1-8 by calling the program instructions.

11. A non-transitory computer-readable storage medium, characterized in that, The non-transitory computer-readable storage medium stores computer instructions, and when the computer instructions are run by the computer, the computer executes the method according to any one of claims 1-8.

12. A computer program product, characterized in that, Includes computer program instructions, and when the computer program instructions are read and run by the processor, the method according to any one of claims 1-8 is executed.

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