Method, device, electronic device and storage medium for determining battery charging rate

Abstract

The present application provides a method, device, electronic device and storage medium for determining the charging rate of a battery. The method includes: obtaining the self-discharge current of the battery during each cycle of charging; the self-discharge current is the self-discharge current collected during the constant voltage charging process when charging the battery at a first charging rate during each cycle of charging, until the battery's power parameter reaches a preset power parameter, and continuing to charge by constant voltage charging; the first charging rate of the battery has different values ​​for different cycle charging processes; and the maximum charging rate corresponding to the battery under the preset power parameter is determined based on the self-discharge current. The embodiment of the present application determines the maximum charging rate of the battery based on the self-discharge current. By guiding the battery charging by the maximum charging rate, metal deposition inside the battery can be reduced, and the risk of side reactions can be reduced while improving the battery charging efficiency.

Description

Technical Field

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

[0002] An all-solid-state battery uses a solid electrolyte, unlike traditional liquid electrolyte batteries. During the charging process, the higher charge rate accelerates the migration of lithium ions to the negative electrode. On the negative electrode surface, lithium ions are reduced and deposited to form lithium metal, resulting in an uneven distribution of lithium ions at the negative electrode, leading to 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 battery charging rate, so as to determine the charging rate of all-solid-state batteries with metal negative electrodes to reduce the risk of abnormal metal deposition.

[0004] In a first aspect, an embodiment of the present application provides a method for determining a battery charging rate, comprising:

[0005] Obtaining a self-discharge current of the battery during each cyclic charging process; the self-discharge current is the self-discharge current collected during each cyclic charging process when the battery is charged at a first charge rate until a battery capacity parameter reaches a preset battery capacity parameter and charging is continued using a constant voltage charging method; the battery capacity parameters include the battery voltage and / or the battery state of charge; wherein the value of the first charge rate of the battery is different in different cyclic charging processes;

[0006] The maximum charge rate corresponding to the battery under preset power parameters is determined based on the self-discharge current; the maximum charge rate is the maximum value of the charge rate when the self-discharge current is normal when charging the battery to the preset power parameters.

[0007] The embodiment of the present application adopts different first charging rates during different cyclic charging processes, monitors the self-discharge current in the constant voltage charging stage, determines the maximum charging rate of the battery based on the self-discharge current, and guides the battery charging by the maximum charging rate. This can reduce side reactions inside the battery (such as metal deposition and increased interface impedance), make the lithium ion distribution on the negative electrode surface more uniform, and improve the battery charging efficiency while reducing the risk of side reactions.

[0008] In a possible implementation of the first aspect, the method further includes:

[0009] Obtain the maximum charging rate corresponding to charging the battery to different preset power parameters;

[0010] Generate a charging strategy for the battery based on the maximum charging rate corresponding to different preset power parameters.

[0011] The embodiment of the present application can specify a phased and personalized charging strategy for the battery through the maximum charging rate corresponding to different preset power parameters, so that the charging process is both fast and smooth, reducing the low charging efficiency or safety hazards caused by excessively high charging rates or construction sites.

[0012] In a possible implementation of the first aspect, the first charge rate gradually increases with the number of cycles; and determining, based on the self-discharge current, a maximum charge rate corresponding to the battery under preset power parameters includes:

[0013] Determine the number of cycles corresponding to the minimum charge rate at which the self-discharge current is abnormal;

[0014] The charging rate corresponding to the maximum cycle number that is less than the cycle number is determined as the maximum charging rate corresponding to the battery under the preset power parameters.

[0015] In the embodiment of the present application, when obtaining the maximum charging rate corresponding to a certain preset power parameter, the value of the first charging rate is gradually tested from small to large until the self-discharge current becomes abnormal. When the first charging rate is small, the self-discharge current abnormality usually does not occur. When the next cycle charging is performed, the battery can still be used to test the next first charging rate, which saves testing costs and can accurately determine the maximum charging rate.

[0016] In a possible implementation of the first aspect, the method further includes:

[0017] Obtaining a first variation curve of a normal self-discharge current over time corresponding to a preset power parameter, and obtaining a second variation curve of a self-discharge current over time corresponding to the preset power parameter and a first charging rate;

[0018] Calculating the difference between the first change curve and the second change curve;

[0019] If the difference is greater than a preset value, it is determined that the self-discharge current corresponding to the second variation curve is abnormal.

[0020] The embodiment of the present application determines whether there is a self-discharge current anomaly by calculating the difference between the first change curve and the second change curve, which can accurately capture the self-discharge behavior of the battery at different charging rates and power states, thereby providing a more accurate data basis for subsequent analysis and judgment.

[0021] In a possible implementation of the first aspect, calculating the difference between the first change curve and the second change curve includes:

[0022] Selecting a first self-discharge current value corresponding to 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 a time point when the first self-discharge current value and the second self-discharge current value reach a stable state;

[0023] The degree of difference is determined based on a difference between the first self-discharge current value and the second self-discharge current value.

[0024] By selecting the current value at the time point when the self-discharge current reaches a stable state, the embodiment of the present application can more realistically reflect the electrochemical reaction conditions inside the battery, reduce the probability of misjudgment due to current fluctuations or temporary interference factors, and improve the accuracy of difference determination.

[0025] In a possible implementation of the first aspect, the method further includes:

[0026] Get the battery health status of the battery to be charged;

[0027] Calculate the parameter offset corresponding to each preset power parameter in the charging strategy based on the battery health status;

[0028] A charge rate threshold of the battery to be charged is determined according to the parameter offset.

[0029] In the embodiment of the present application, since the battery health status will gradually deteriorate 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 that of a new battery, the accuracy of determining the charging rate threshold of the rechargeable battery can be improved by using the parameter offset.

[0030] In a possible implementation of the first aspect, determining a maximum charge rate corresponding to a battery under preset power parameters based on a self-discharge current includes:

[0031] Obtaining charging parameters of the battery during a process of charging to a cutoff voltage using a first charging rate; the charging parameters include at least one of charging time, charging efficiency, battery temperature, battery internal resistance, and battery capacity retention rate;

[0032] The self-discharge current and charging parameters are input 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.

[0033] The embodiment of the present application uses a rate prediction model to comprehensively analyze the self-discharge current and charging parameters to achieve intelligent prediction of the maximum charging rate, thereby more accurately matching the optimal charging rate of the battery under different conditions.

[0034] In a second aspect, an embodiment of the present application provides another method for determining a battery charging rate, including:

[0035] The battery is cyclically charged using a first charging rate so that a battery power parameter reaches a preset power parameter; the power parameter includes a battery voltage and / or a battery state of charge; and the first charging rate has different values ​​in different cyclic charging processes;

[0036] The battery that has reached the preset power parameters is charged using a constant voltage charging method, and the self-discharge current of the battery during the constant voltage charging process is collected;

[0037] Determine the maximum charge rate corresponding to the battery under preset power parameters based on the self-discharge current; the maximum charge rate is the maximum value of the charge rate when the self-discharge current is normal when charging the battery to the preset power parameters;

[0038] Set different preset power parameters and follow the above steps to obtain the corresponding maximum charge rate under each preset power parameter;

[0039] Generate a charging strategy for the battery based on the maximum charging rate corresponding to different preset power parameters.

[0040] The embodiment of the present application adopts different first charging rates during different cyclic charging processes, monitors the self-discharge current in the constant voltage charging stage, determines the maximum charging rate of the battery based on the self-discharge current, and guides the battery charging by the maximum charging rate. This can reduce side reactions (such as metal deposition) inside the battery, and can improve the battery charging efficiency while reducing the risk of side reactions.

[0041] In a third aspect, an embodiment of the present application provides a device for determining a battery charging rate, comprising:

[0042] a current acquisition module for obtaining the self-discharge current of the battery during each charging cycle; the self-discharge current is the self-discharge current collected during each charging cycle when the battery is charged at a first charging rate until the battery capacity parameter reaches a preset capacity parameter and charging is continued using a constant voltage charging method; the negative electrode of the battery is made of metal and the electrolyte of the battery is a solid electrolyte; the capacity parameters include the battery voltage and / or the battery state of charge;

[0043] The rate determination module is used to determine the maximum charge rate corresponding to the battery under preset power parameters based on the self-discharge current; wherein, the value of the first charge rate of the battery is different in different cyclic charging processes; the maximum charge rate is the maximum value of the charge rate when the self-discharge current is normal when charging the battery to the preset power parameters.

[0044] In a fourth aspect, an embodiment of the present application provides an electronic device, including: a processor, a memory, and a bus, wherein:

[0045] The processor and memory communicate with each other through the bus;

[0046] The memory stores program instructions that can be executed by the processor, and the processor calls the program instructions to execute the method of the first aspect or the second aspect.

[0047] In a fifth aspect, an embodiment of the present application provides a non-transitory computer-readable storage medium, comprising:

[0048] The non-transitory computer-readable storage medium stores computer instructions, which enable a computer to execute the method in each possible implementation of the first aspect or the second aspect.

[0049] In a sixth aspect, an embodiment of the present application provides a computer program product, comprising computer program instructions, which, when read and executed by a processor, execute the methods in each possible implementation of the first aspect or the second aspect.

[0050] Other features and advantages of the present application will be described in the following description and, in part, will become apparent from the description or be understood by practicing the embodiments of the present application. The objectives and other advantages of the present application can be achieved and obtained through the structures particularly pointed out in the written description, claims, and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0052] Figure 1 A flowchart of a method for determining a battery charging rate according to an embodiment of the present application is provided;

[0053] Figure 2 A flowchart of another method for determining a battery charging rate provided in an embodiment of the present application;

[0054] Figure 3 A schematic diagram of a self-discharge current curve at different rates provided in an embodiment of the present application;

[0055] Figure 4 A schematic diagram of the structure of a device for determining a battery charging rate provided in an embodiment of the present application;

[0056] Figure 5 A schematic diagram of the physical structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0057] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0058] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein 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-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0059] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0060] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0061] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0062] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0063] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0064] Metal-anode all-solid-state batteries are a new type of battery system. An all-solid-state battery refers to a battery in which the electrolyte is solid, as opposed to a traditional liquid electrolyte battery. A metal anode refers to a battery in which the anode material is made of metal, such as lithium or sodium. Taking lithium metal as an example, the working principle of a metal-anode all-solid-state battery is primarily based on the redox reaction of metallic lithium. During charging, lithium ions are released from the positive electrode material and embedded into the negative electrode through the solid electrolyte, forming metallic lithium. During discharge, the metallic lithium undergoes an oxidation reaction, and the lithium ions return to the positive electrode material.

[0065] All-solid-state batteries with metal anodes consist of an anode, a solid electrolyte, and a cathode. The metal anode can directly serve as the battery's negative electrode, forming a solid electrolyte interface (SEI) film on its surface. This SEI film significantly impacts battery performance, preventing side reactions that could occur due to direct contact between lithium metal and the solid electrolyte. However, the stability of the SEI film is a key issue during cycling. An unstable SEI film can lead to uneven lithium ion deposition, forming lithium dendrites. The solid electrolyte is a core component of all-solid-state batteries. Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes. Common polymer solid electrolytes include polyethers (polyethylene oxide), polysiloxanes, polycarbonates, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, single-ion polymers, polyionic liquids-lithium salts, and cellulose. Inorganic solid electrolytes can include oxide solid electrolytes (crystalline perovskites, sodium superconducting ion conductors, garnets, amorphous LiPON films), sulfide solid electrolytes (crystalline lithium superion conductors (lithium germanium phosphosulfide, argyrodite), amorphous sulfides), and 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.

[0066] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.

[0067] In some embodiments, the battery may be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0068] In some embodiments, the battery may be a battery pack, which includes a case and battery cells, wherein the battery cells or battery modules are housed in the case.

[0069] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0070] In some embodiments, the battery may be an energy storage device, including an energy storage container, an energy storage cabinet, and the like.

[0071] The battery cells described in the embodiments of the present application are suitable for batteries and electrical equipment using the battery cells.

[0072] Electrical equipment can be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys and electric tools, etc. Vehicles can be fuel vehicles, gas vehicles or new energy vehicles. New energy vehicles can be pure electric vehicles, hybrid vehicles or extended-range vehicles, etc.; spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.; electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc.; power tools include metal cutting power tools, grinding power tools, assembly power tools and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers, etc. The embodiments of the present application do not impose special restrictions on the above-mentioned electrical equipment. For the convenience of explanation, the following embodiments are described by taking the electrical equipment as a vehicle as an example.

[0073] The metal negative electrode all-solid-state battery in the embodiment of the present application can be a secondary battery. A secondary battery refers to a battery that can be charged at a certain charging rate after discharge to activate the active material and continue to be used.

[0074] The charge rate describes the amount of charge a battery can hold in a given timeframe. Generally, the higher the charge rate, the greater the charging current. A higher charge rate accelerates the migration of lithium ions to the negative electrode. On the metal negative electrode surface, lithium ions are reduced and deposited to form lithium metal. If the charge rate is too high, the rate of lithium ion deposition may exceed the rate of lithium ion diffusion on the negative electrode surface, leading to localized accumulation of lithium ions on the negative electrode surface and exacerbating the growth of lithium dendrites.

[0075] Therefore, a suitable charging rate can extend the service life of the battery. At present, when charging a metal-negative-electrode all-solid-state battery, if the charging rate is too large, it will cause the problem of uneven distribution of lithium ions in the metal-based negative electrode of the battery, and even abnormal metal deposition, thereby forming metal dendrites. After the metal dendrites grow into the electrolyte layer, a micro-short circuit phenomenon occurs in the positive and negative electrodes, thereby causing abnormal battery self-discharge. For the charging of non-metallic negative-electrode solid-state batteries, if the charging rate is too large, the reduced lithium ions cannot be completely embedded in the negative electrode, and lithium metal is reduced to form on the surface of the negative electrode, and the metal dendrites grow into the electrolyte layer, and finally a micro-short circuit phenomenon occurs. The embodiment of the present application provides a method for determining the charging rate of a battery, by using different charging rates to charge the battery to a certain cut-off voltage, and then using open circuit voltage to perform constant voltage charging on the battery, and collecting the self-discharge current during the constant voltage charging process, and determining the maximum charging rate of the battery at the charging cut-off voltage by analyzing whether the self-discharge current is abnormal, thereby guiding the charging rate of the battery during subsequent use, reducing the risk of metal deposition, and improving the safety of the battery.

[0076] It should be noted that the method for determining the battery charge 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 all-solid-state batteries as an example, there is a problem of uneven distribution of lithium ions in the negative electrode. This is because the ion migration path of the solid electrolyte is fixed, and it cannot alleviate the problem of excessive local lithium ion concentration by flow like a liquid electrolyte. The uneven distribution of lithium ions in the negative electrode may lead to negative effects such as local overcharging and interface problems between the negative electrode and the solid electrolyte. For the sake of ease of description, the subsequent embodiments are described using metallic lithium as the negative electrode of the battery as an example.

[0077] Figure 1 A flow chart of a method for determining a battery charging rate provided in an embodiment of the present application is shown as follows: Figure 1 As shown, the method includes:

[0078] Step 101: Obtaining a self-discharge current of the battery during each cyclic charging process; the self-discharge current is the self-discharge current collected during each cyclic charging process when the battery is charged at a first charge rate until a battery capacity parameter reaches a preset battery capacity parameter and charging is continued using a constant voltage charging method; the battery capacity parameter includes a battery voltage and / or a battery state of charge; wherein the value of the first charge rate of the battery is different in different cyclic charging processes;

[0079] Step 102: Determine the maximum charge rate corresponding to the battery under preset power parameters based on the self-discharge current; the maximum charge rate is the maximum value of the charge rate when the self-discharge current is normal and the battery is charged to the preset power parameters.

[0080] In a specific implementation process, the battery can be a fresh, unused battery. The battery is cyclically charged and discharged, and the self-discharge current in each cycle is obtained, wherein the self-discharge current refers to the discharge current spontaneously generated internally by the battery when it is not connected to an external circuit or without an external load. The generation of 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 cause the local lithium ion concentration to be too high. In high-concentration areas, lithium ions are easily reduced and deposited on the surface of the negative electrode to form lithium metal, which is the lithium precipitation phenomenon.

[0081] The following describes one cycle of charge and discharge:

[0082] (1) The battery is charged at a first charging rate so that the battery's power parameter reaches a preset power parameter. The power parameter is a key indicator for measuring the battery's charging state, such as the battery voltage or the battery's state of charge. For ease of description, the battery voltage is used as an example in the following description.

[0083] (2) Since there is a polarization reaction inside the battery that has just been charged, the battery can be left to stand for a period of time, for example, for 2 minutes. The specific standing time can be set according to actual needs, and the embodiments of the present application do not specifically limit this.

[0084] (3) The voltage of the battery after resting will be lower than the voltage of the battery just charged in step (1). Therefore, the battery can be charged again. It is understandable that this charging can be done at a low rate, such as 0.1C, 0.2C, etc. The purpose of using a low rate is to reduce internal polarization of the battery.

[0085] (4) Let the battery rest again. This time, the rest time can be slightly longer, for example, 3 hours, 3.5 hours, or 2.5 hours. The purpose is to allow the battery to reach a stable state.

[0086] (5) The battery is recharged using constant voltage charging, where 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 constant voltage charging mode, and the self-discharge current during the constant voltage charging process is collected according to the preset collection interval. In addition, the duration of 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 constant voltage charging duration can be reduced; if the self-discharge current of the battery stabilizes slowly, the constant voltage charging duration can be appropriately increased. A method for determining whether the self-discharge current is stable can be to determine the rate of change of the self-discharge current over time. When the rate of change is less than the preset value, it means that the self-discharge current is tending to be stable.

[0087] It should be noted that the value of the first charge rate in step (1) is different in each cycle. Therefore, the self-discharge current values ​​corresponding to different first charge rates can be obtained under the same preset power parameters. For the convenience of testing, the first charge rate can be set to gradually increase with the number of cycles. In the embodiment of the present application, the self-discharge current during the constant voltage charging process is used to eliminate the interference caused by different charge rates.

[0088] After obtaining the self-discharge current corresponding to different first charge rates, the maximum value of the first charge rate at which the self-discharge current is normal can be determined, and the maximum value of the first charge rate can be used as the maximum charge rate. It should be noted that the method for determining whether the self-discharge current is normal can be to pre-set a normal value range for the self-discharge current. If the stable self-discharge current is within the 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 specifically limit this.

[0089] It should be noted that before testing the maximum charging rate of the battery under various preset power parameters, the battery capacity can be tested. Specifically, the battery can be charged to the upper voltage limit at a small rate, and then discharged to the lower voltage limit at a small rate. The battery capacity can be determined based on the charge and discharge current and time.

[0090] The embodiment of the present application adopts different first charging rates in different cyclic charging processes, monitors the self-discharge current in the constant voltage charging stage, determines the maximum charging rate of the battery based on the self-discharge current, and guides the battery charging by the maximum charging rate. This can reduce side reactions inside the battery (such as metal deposition), and can improve the battery charging efficiency while reducing the risk of side reactions.

[0091] Based on the above embodiment, the method further includes:

[0092] Obtain the maximum charging rate corresponding to charging the battery to different preset power parameters;

[0093] Generate a charging strategy for the battery based on the maximum charging rate corresponding to different preset power parameters.

[0094] In a 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 can be obtained in accordance with steps (1) to (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.

[0095] A charging strategy for the battery is generated based on the maximum charge rates corresponding to different preset power parameters, which can be presented in a table format. The charging strategy can include the maximum charge rates corresponding to each preset power parameter. For example, this can be a relationship between the battery's state of charge (SOC) and the maximum charge rate.

[0096] It should be noted that after completing each test of the maximum charge rate corresponding to a preset power parameter, a new battery needs to be replaced to perform the next preset power parameter test. This is because each preset power parameter test will cause the battery to stop after abnormal self-discharge. In order to avoid interfering with the next preset power parameter test, the battery needs to be replaced.

[0097] The embodiment of the present application can specify a phased and personalized charging strategy for the battery through the maximum charging rate corresponding to different preset power parameters, so that the charging process is both fast and smooth, reducing the low charging efficiency or safety hazards caused by excessively high charging rates or construction sites.

[0098] Based on the above embodiment, the first charging rate gradually increases with the number of cycles; and determining the maximum charging rate corresponding to the battery under the preset power parameters based on the self-discharge current includes:

[0099] Determine the number of cycles corresponding to the minimum charge rate at which the self-discharge current is abnormal;

[0100] The charging rate corresponding to the maximum cycle number that is less than the cycle number is determined as the maximum charging rate corresponding to the battery under the preset power parameters.

[0101] In a specific implementation, the battery is charged at a first charge rate during the initial stage of each charging cycle. This first charge rate gradually increases with the number of cycles. For example, a lower charge rate (e.g., 0.5C) can be used in the initial cycle, and as the number of cycles increases, the charge rate can be gradually increased (e.g., 1C, 2C, etc.). Furthermore, since self-discharge anomalies are less likely to occur during low-rate charging, the difference between the charge rates between two adjacent cycles can be set larger during low-rate charging. However, since self-discharge current anomalies are more likely to occur during higher-rate charging, the difference between the charge rates between two adjacent cycles can be set smaller. In other words, the specific value of the first charge rate can increase with the number of cycles, while the difference between the charge rates between two adjacent cycles can decrease with the number of cycles. This improves testing efficiency and allows for faster determination of the maximum charge rate; it also allows for more accurate determination of the maximum charge rate.

[0102] Since the first charge rate increases gradually, once the first charge rate at which the self-discharge current begins to become abnormal is determined, the charge rate that is slightly lower than the first charge rate can be used as the maximum charge rate. For example, in the 49th cycle, the first charge rate is 2.3C, at which point the self-discharge current is normal; in the 50th cycle, the first charge rate is 2.4C, at which point the self-discharge current becomes abnormal. Therefore, 2.3C is used as the maximum charge rate.

[0103] In the embodiment of the present application, when obtaining the maximum charging rate corresponding to a certain preset power parameter, the value of the first charging rate is gradually tested from small to large until the self-discharge current becomes abnormal. When the first charging rate is small, the self-discharge current abnormality usually does not occur. When the next cycle charging is performed, the battery can still be used to test the next first charging rate, which saves testing costs and can accurately determine the maximum charging rate.

[0104] Based on the above embodiment, the method further includes:

[0105] Obtaining a first variation curve of a normal self-discharge current over time corresponding to a preset power parameter, and obtaining a second variation curve of a self-discharge current over time corresponding to the preset power parameter and a first charging rate;

[0106] Calculating the difference between the first change curve and the second change curve;

[0107] If the difference is greater than a preset value, it is determined that the self-discharge current corresponding to the second variation curve is abnormal.

[0108] In a specific implementation process, the normal self-discharge current corresponding to different preset power parameters can be tested in advance. In the embodiment of the present application, different charging cut-off voltages are used as an example. The specific process is as follows:

[0109] Charge the battery at a low rate (e.g., less than 1C) until the battery voltage reaches the preset charge cutoff voltage. After a period of rest, charge the battery at a constant voltage at an open circuit voltage for a preset duration. The self-discharge current during this constant voltage charging process is measured. Because metal deposition anomalies typically do not occur at low charging rates, the self-discharge current measured is considered normal.

[0110] The above method is cyclically executed with different charge cut-off voltages until the normal self-discharge current corresponding to each of the charge cut-off voltages is obtained. It should be noted that the interval between the charge cut-off voltages can be set according to actual conditions. For example, the above cycle can be executed every 0.1V until the maximum charge cut-off voltage is reached. The value of the maximum charge cut-off voltage is determined according to the battery, and the maximum charge cut-off voltage corresponding to different batteries may be different. In addition, since multiple self-discharge currents are collected during the constant voltage charging process, a self-discharge current change curve over time, i.e., a first change curve, can be formed based on the multiple self-discharge currents. Each charge cut-off voltage corresponds to a first change curve, which can be used as a normal self-discharge current curve.

[0111] When determining the maximum charge rate of the battery, a second change curve of the self-discharge current over time corresponding to charging the battery at the first charge rate to a preset power parameter is obtained. It can be understood that the generation method of the second change curve is similar to the generation method of the first change curve.

[0112] Calculate the difference between the first change curve and the second change curve, wherein the method for calculating the difference can adopt the Manhattan distance method, the Euclidean distance method, a curve fitting-based method (for example, the least squares method), a dynamic time warping-based method, etc.

[0113] If the difference 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; conversely, if the difference is not greater than the preset value, it means that the two curves differ slightly, and it is determined that the self-discharge current corresponding to the second change curve is normal.

[0114] The embodiment of the present application determines whether there is a self-discharge current anomaly by calculating the difference between the first change curve and the second change curve, which can accurately capture the self-discharge behavior of the battery at different charging rates and power states, thereby providing a more accurate data basis for subsequent analysis and judgment.

[0115] Based on the above embodiment, calculating the difference between the first change curve and the second change curve includes:

[0116] Selecting a first self-discharge current value corresponding to 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 a time point when the first self-discharge current value and the second self-discharge current value reach a stable state;

[0117] The degree of difference is determined based on a difference between the first self-discharge current value and the second self-discharge current value.

[0118] During the specific implementation process, as the constant voltage charging occurs, the self-discharge current gradually stabilizes. The self-discharge current values ​​corresponding to the same time point after stabilization are collected from the first change curve and the second change curve, respectively, to obtain 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.

[0119] The difference between the first self-discharge current value and the second self-discharge current value is calculated. 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.

[0120] By selecting the current value at the time point when the self-discharge current reaches a stable state, the embodiment of the present application can more realistically reflect the electrochemical reaction conditions inside the battery, reduce the probability of misjudgment due to current fluctuations or temporary interference factors, and improve the accuracy of difference determination.

[0121] Based on the above embodiment, the method further includes:

[0122] Get the battery health status of the battery to be charged;

[0123] Calculate the parameter offset corresponding to each preset power parameter in the charging strategy based on the battery health status;

[0124] A charge rate threshold of the battery to be charged is determined according to the parameter offset.

[0125] In a specific implementation, the battery to be charged can be either an unused battery or a used battery. The state of health (SOH) of an unused battery is typically 100%, while the SOH of a used battery may be less than 100%. In order to obtain the charge rate threshold corresponding to the current to be charged, the maximum charge rate corresponding to the battery to be charged when charged to the corresponding SOC can be determined based on the SOH of the battery to be charged and the charging strategy. For example, if the maximum charge 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%, i.e., the parameter offset is 8%. Therefore, the maximum charge rate corresponding to 72% SOC of the battery to be charged is 3C.

[0126] In the embodiment of the present application, since the battery health status will gradually deteriorate 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 that of a new battery, the accuracy of determining the charging rate threshold of the rechargeable battery can be improved by using the parameter offset.

[0127] Based on the above embodiment, determining the maximum charge rate corresponding to the battery under preset power parameters based on the self-discharge current includes:

[0128] Obtaining charging parameters of the battery during a process of charging to a cutoff voltage using a first charging rate; the charging parameters include at least one of charging time, charging efficiency, battery temperature, battery internal resistance, and battery capacity retention rate;

[0129] The self-discharge current and charging parameters are input 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.

[0130] In the specific implementation process, the charging time refers to the time required to record the battery from the initial state to the cut-off voltage. The charging time reflects the charging speed of the battery at a specific charging rate.

[0131] Charging efficiency is the ratio of the input power during the charging process to the actual storage power of the battery. Charging efficiency reflects the battery's effective utilization of input energy.

[0132] Battery temperature refers to the temperature of the battery during the charging process. Battery temperature is one of the key factors affecting battery performance and safety.

[0133] Battery capacity retention is used to record the battery's capacity retention after multiple cycles. Capacity retention is an important indicator for evaluating battery aging.

[0134] Before using the rate prediction model for prediction, you can first perform model training. The specific method is as follows:

[0135] Collect a large amount of battery charging data at different charge rates and battery states, including self-discharge current and the aforementioned charging parameters. Perform preprocessing operations such as cleaning and normalization on this data to improve model training results.

[0136] Based on the characteristics of the problem and the nature of the data, select an appropriate machine learning algorithm to build a rate prediction model. Common algorithms include neural networks, support vector machines, random forests, etc.

[0137] The preprocessed data is fed into the selected machine learning algorithm for training. By adjusting the model parameters, the model can accurately predict the maximum charge rate under given self-discharge current and charging parameters.

[0138] After obtaining the trained model, the current battery self-discharge current and charging parameters are input into the trained rate prediction model. Based on the input data, the model outputs the corresponding predicted maximum charge rate. The maximum charge rate is the highest rate that can safely charge the battery to the preset capacity parameters.

[0139] The embodiment of the present application uses a rate prediction model to comprehensively analyze the self-discharge current and charging parameters to achieve intelligent prediction of the maximum charging rate, thereby more accurately matching the optimal charging rate of the battery under different conditions.

[0140] Figure 2 A flow chart of another method for determining a battery charging rate provided in an embodiment of the present application is shown in FIG. Figure 2 As shown, the method includes:

[0141] Step 201: Charge the battery using a first charging rate so that the battery's power parameters reach preset power parameters; the power parameters include battery voltage and / or battery state of charge; it should be noted that after charging the battery using the first charging rate to reach the preset power parameters, the battery can be left to stand for a period of time and then charged again using a small rate so that its power parameters reach the preset power parameters again.

[0142] Step 202: Charge the battery that has reached the preset power parameters using constant voltage charging, and collect the self-discharge current of the battery during the constant voltage charging process; it should be noted that before using constant voltage charging, the battery can be left to stand for a period of time, for example, for 3 hours, to reduce interference caused by internal polarization of the battery.

[0143] Step 203: Determine whether the self-discharge current is normal; if normal, discharge the battery to the lower voltage limit, re-execute step 201, and modify the value of the first charge rate. Specifically, the value of the first charge rate can be gradually increased according to the number of cycles; if abnormal, execute step 204;

[0144] Step 204: The first charging rate in the previous cycle is used as the maximum charging rate.

[0145] Step 205: Determine whether the maximum power parameter has been reached, for example, the voltage limit has been reached; if so, the process ends; otherwise, re-execute step 201 and update the first charge rate and preset power parameter in step 201. Specifically, the first charge rate is updated to the minimum rate, for example, 0.1C. The specific minimum rate is set according to actual needs. The preset power parameter can gradually increase 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 involved in the test should remain consistent.

[0146] It should be noted that an electrochemical workstation or other device can be used to charge and discharge the battery, collect the battery's self-discharge current, and use a host computer to determine whether the self-discharge current is abnormal and determine the maximum charge rate. Of course, charging and discharging the battery, collecting the self-discharge current, determining whether the self-discharge current is abnormal, and determining the maximum charge rate can also be achieved by the same device.

[0147] Figure 3 This is a schematic diagram of the self-discharge current curve at different charging rates provided in 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 small. After charging at 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 at rate C3, the measured self-discharge current increases significantly, indicating that abnormal lithium deposition occurs in the charging of the battery cell at rate C3, resulting in abnormal self-discharge of the battery cell.

[0148] The embodiments of the present application can effectively detect abnormal battery endpoints by monitoring the self-discharge current, thereby specifying the charging window of metal negative electrode all-solid-state batteries.

[0149] Figure 4 This is a schematic diagram of a device for determining a battery charging rate according to an embodiment of the present application. The device may be a module, program segment or code on an electronic device. Figure 1 The method embodiment corresponds to the embodiment that can be executed Figure 1 The various steps involved in the method embodiment and the specific functions of the device can be found in the description above. To avoid repetition, detailed description is omitted here. The device includes: a current acquisition module 401 and a magnification determination module 402, wherein:

[0150] The current acquisition module 401 is used to obtain the self-discharge current of the battery during each cyclic charging process; the self-discharge current is the self-discharge current collected during each cyclic charging process when the battery is charged at a first charging rate until the battery power parameter reaches a preset power parameter and charging is continued using a constant voltage charging method; the negative electrode of the battery is made of metal and the electrolyte of the battery is a solid electrolyte; the power parameters include the battery voltage and / or the battery state of charge;

[0151] The rate determination module 402 is used to determine the maximum charging rate corresponding to the battery under preset power parameters based on the self-discharge current; wherein, the value of the first charging rate of the battery is different in different cyclic charging processes; the maximum charging rate is the maximum value of the charging rate when the self-discharge current is normal when the battery is charged to the preset power parameters.

[0152] Based on the above embodiment, the device further includes a charging strategy generation module, which is used to:

[0153] Obtaining a maximum charging rate corresponding to charging the battery to different preset power parameters;

[0154] A charging strategy corresponding to the battery is generated according to the maximum charging rate corresponding to different preset power parameters.

[0155] Based on the above embodiment, the first charging rate gradually increases with the number of cycles; the rate determination module 402 is specifically configured to:

[0156] Determine the number of cycles corresponding to the minimum charge rate at which the self-discharge current is abnormal;

[0157] The charging rate corresponding to the maximum cycle number that is less than the cycle number is determined as the maximum charging rate corresponding to the battery under the preset power parameters.

[0158] Based on the above embodiment, the device further includes an anomaly detection module, which is used to:

[0159] Obtaining a first change curve of a normal self-discharge current corresponding to the preset power parameter over time, and obtaining a second change curve of a self-discharge current corresponding to the preset power parameter and the first charge rate over time;

[0160] calculating a difference between the first change curve and the second change curve;

[0161] If the difference is greater than a preset value, it is determined that the self-discharge current corresponding to the second change curve is abnormal.

[0162] Based on the above embodiment, the anomaly detection module is specifically used to:

[0163] selecting a first self-discharge current value corresponding to 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 a time point when the first self-discharge current value and the second self-discharge current value reach a stable state;

[0164] The degree of difference is determined according to a difference between the first self-discharge current value and the second self-discharge current value.

[0165] Based on the above embodiment, the device further includes a rate threshold determination module, which is used to:

[0166] Get the battery health status of the battery to be charged;

[0167] Calculating parameter offsets corresponding to each preset power parameter in the charging strategy based on the battery health status;

[0168] A charge rate threshold of the battery to be charged is determined according to the parameter offset.

[0169] Based on the above embodiment, the magnification ratio determination module 402 is specifically configured to:

[0170] Obtaining charging parameters of the battery during a process of charging the battery to a cutoff voltage using a first charging rate; the charging parameters include at least one of charging time, charging efficiency, battery temperature, battery internal resistance, and battery capacity retention rate;

[0171] The self-discharge current and the charging parameters are input into a 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.

[0172] Figure 5 The physical structure diagram of the electronic device provided in the embodiment of the present application is as follows: Figure 5 As shown, the electronic device includes: a processor (processor) 501, a memory (memory) 502 and a bus 503; wherein:

[0173] The processor 501 and the memory 502 communicate with each other via the bus 503;

[0174] The processor 501 is used to call the program instructions in the memory 502 to execute the methods provided by the above-mentioned method embodiments, for example, 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 when the battery is charged at a first charging rate during each cycle charging process until the battery's power parameter reaches a preset power parameter, and the battery continues to be charged in a constant voltage charging manner; the power parameter includes the battery voltage and / or the battery state of charge; wherein, the value of the first charging rate of the battery is different in different cycle charging processes; determining 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 charging rate when the self-discharge current is normal when the battery is charged to the preset power parameter.

[0175] Processor 501 can be an integrated circuit chip with signal processing capabilities. Processor 501 can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), or a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic device, discrete gate or transistor logic device, or discrete hardware component. It can implement or execute the various methods, steps, and logic block diagrams disclosed in the embodiments of this application. A general-purpose processor can be a microprocessor or any conventional processor.

[0176] The memory 502 may include, but is not limited to, random access memory (RAM), read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), etc.

[0177] This embodiment discloses a computer program product, which 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 perform the methods provided in the above-mentioned method embodiments, for example, including:

[0178] Obtain 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 when the battery is charged at a first charging rate until the battery capacity parameter reaches a preset capacity parameter and charging is continued using a constant-voltage charging method during each cyclic charging process; the capacity parameters include the battery voltage and / or the battery state of charge; wherein, the value of the first charging rate of the battery is different for different cyclic charging processes; based on the self-discharge current, the maximum charging rate corresponding to the battery under the preset capacity parameters is determined; the maximum charging rate is the maximum value of the charging rate when the self-discharge current is normal when the battery is charged to the preset capacity parameters.

[0179] This embodiment provides a non-transitory computer-readable storage medium storing computer instructions. The computer instructions enable the computer to execute the methods provided by the above method embodiments, for example, including:

[0180] Obtain 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 when the battery is charged at a first charging rate until the battery capacity parameter reaches a preset capacity parameter and charging is continued using a constant-voltage charging method during each cyclic charging process; the capacity parameters include the battery voltage and / or the battery state of charge; wherein, the value of the first charging rate of the battery is different for different cyclic charging processes; based on the self-discharge current, the maximum charging rate corresponding to the battery under the preset capacity parameters is determined; the maximum charging rate is the maximum value of the charging rate when the self-discharge current is normal when the battery is charged to the preset capacity parameters.

[0181] In the embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For 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 mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interface, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0182] In addition, the units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0183] Furthermore, the functional modules in each embodiment of the present application can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0184] In this document, relational terms such as first and second, etc. are used merely to distinguish one entity or operation from another entity or operation, but do not necessarily require or imply any actual relationship or order between these entities or operations.

[0185] The above description is merely an embodiment of the present application and is not intended to limit the scope of protection of the present application. For those skilled in the art, various modifications and variations of the present application are possible. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A method for determining a battery charging rate, characterized in that: The method comprises: Obtaining a 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 when the battery is charged at a first charging rate until a power parameter of the battery reaches a preset power parameter and charging is continued using a constant-voltage charging method; the power parameter includes a battery voltage and / or a battery state of charge; wherein the value of the first charging rate of the battery is different in different cyclic charging processes; Determining a maximum charge rate corresponding to the battery under the preset power parameters based on the self-discharge current; the maximum charge rate is the maximum value of the charge rate when the self-discharge current is normal and the battery is charged to the preset power parameters; The first charging rate gradually increases with the number of cycles; and determining the maximum charging rate corresponding to the battery under the preset power parameters based on the self-discharge current includes: Determine the number of cycles corresponding to the minimum charge rate at which the self-discharge current is abnormal; Determining a charge rate corresponding to a maximum cycle number less than the cycle number as a maximum charge rate corresponding to the battery under the preset power parameters; The method further comprises: Obtaining a first change curve of a normal self-discharge current corresponding to the preset power parameter over time, and obtaining a second change curve of a self-discharge current corresponding to the preset power parameter and the first charge rate over time; calculating a difference between the first change curve and the second change curve; If the difference is greater than a preset value, determining that the self-discharge current corresponding to the second change curve is abnormal; The calculating the difference between the first change curve and the second change curve includes: selecting a first self-discharge current value corresponding to 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 a time point when the first self-discharge current value and the second self-discharge current value reach a stable state; The degree of difference is determined according to a difference between the first self-discharge current value and the second self-discharge current value.

2. The method according to claim 1, characterized in that The method further comprises: Obtaining a maximum charging rate corresponding to charging the battery to different preset power parameters; A charging strategy corresponding to the battery is generated according to the maximum charging rate corresponding to different preset power parameters.

3. The method according to claim 2, characterized in that The method further comprises: Get the battery health status of the battery to be charged; Calculating parameter offsets corresponding to each preset power parameter in the charging strategy based on the battery health status; A charge rate threshold of the battery to be charged is determined according to the parameter offset.

4. The method according to any one of claims 1 to 3, characterized in that The determining, based on the self-discharge current, the maximum charge rate corresponding to the battery under the preset power parameters includes: Obtaining charging parameters of the battery during a process of charging the battery to a cutoff voltage using a first charging rate; the charging parameters include at least one of charging time, charging efficiency, battery temperature, battery internal resistance, and battery capacity retention rate; The self-discharge current and the charging parameters are input into a 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.

5. A method for determining a battery charging rate, characterized in that: The method comprises: The battery is cyclically charged using a first charging rate so that a power parameter of the battery reaches a preset power parameter; the power parameter includes a battery voltage and / or a battery state of charge; and the first charging rate has different values ​​in different cyclic charging processes; Charging the battery that has reached a preset power parameter using a constant voltage charging method, and collecting the self-discharge current of the battery during the constant voltage charging process; Determining a maximum charge rate corresponding to the battery under the preset power parameters based on the self-discharge current; the maximum charge rate is the maximum value of the charge rate when the self-discharge current is normal and the battery is charged to the preset power parameters; Set different preset power parameters and follow the above steps to obtain the corresponding maximum charge rate under each preset power parameter; Generating a charging strategy corresponding to the battery according to the maximum charging rate corresponding to different preset power parameters; The first charging rate gradually increases with the number of cycles; and determining the maximum charging rate corresponding to the battery under the preset power parameters based on the self-discharge current includes: Determine the number of cycles corresponding to the minimum charge rate at which the self-discharge current is abnormal; Determining a charge rate corresponding to a maximum cycle number less than the cycle number as a maximum charge rate corresponding to the battery under the preset power parameters; The method further comprises: Obtaining a first change curve of a normal self-discharge current corresponding to the preset power parameter over time, and obtaining a second change curve of a self-discharge current corresponding to the preset power parameter and the first charge rate over time; calculating a difference between the first change curve and the second change curve; If the difference is greater than a preset value, determining that the self-discharge current corresponding to the second change curve is abnormal; The calculating the difference between the first change curve and the second change curve includes: selecting a first self-discharge current value corresponding to 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 a time point when the first self-discharge current value and the second self-discharge current value reach a stable state; The degree of difference is determined according to a difference between the first self-discharge current value and the second self-discharge current value.

6. A device for determining a battery charging rate, characterized in that: include: The current acquisition module 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 each charging cycle when the battery is charged at a first charging rate until the battery capacity parameter reaches a preset capacity parameter and charging is continued using a constant voltage charging method; the negative electrode of the battery is made of metal, and the electrolyte of the battery is a solid electrolyte; the capacity parameters include battery voltage and / or battery state of charge; a rate determination module, configured to determine, based on the self-discharge current, a maximum charge rate corresponding to the battery under the preset power parameters; wherein, in different cyclic charging processes, the first charge rate of the battery has different values; and the maximum charge rate is the maximum value of the charge rate when the self-discharge current is normal and the battery is charged to the preset power parameters; The first charging rate gradually increases with the number of cycles; the rate determination module is specifically used to: Determine the number of cycles corresponding to the minimum charge rate at which the self-discharge current is abnormal; Determining a charge rate corresponding to a maximum cycle number less than the cycle number as a maximum charge rate corresponding to the battery under the preset power parameters; The multiplication rate determination module is further used for: Obtaining a first change curve of a normal self-discharge current corresponding to the preset power parameter over time, and obtaining a second change curve of a self-discharge current corresponding to the preset power parameter and the first charge rate over time; calculating a difference between the first change curve and the second change curve; If the difference is greater than a preset value, determining that the self-discharge current corresponding to the second change curve is abnormal; The calculating the difference between the first change curve and the second change curve includes: selecting a first self-discharge current value corresponding to 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 a time point when the first self-discharge current value and the second self-discharge current value reach a stable state; The degree of difference is determined according to a difference between the first self-discharge current value and the second self-discharge current value.

7. An electronic device, characterized in that: include: A processor, memory, and bus, where: The processor and the memory communicate with each other via the bus; The memory stores program instructions that can be executed by the processor, and the processor calls the program instructions to execute the method according to any one of claims 1 to 5.

8. A non-transitory computer-readable storage medium, characterized in that The non-transitory computer-readable storage medium stores computer instructions, which, when executed by a computer, enable the computer to perform the method according to any one of claims 1 to 5.

9. A computer program product, characterized in that The method comprises computer program instructions, and when the computer program instructions are read and executed by a processor, the method according to any one of claims 1 to 5 is executed.

Images