Lithium battery charging control method, charging control device, equipment and medium

Abstract

The invention provides a charging control method and device of a lithium battery, equipment and a medium. The method comprises the following steps: acquiring a current state parameter of the lithium battery in real time; wherein the current state parameters comprise graphite open-circuit voltage, lithium potential, anode impedance and charging current; calculating the current anode potential of the lithium battery based on the graphite open-circuit voltage, the anode impedance and the charging current; and dynamically adjusting the charging current of the lithium battery based on the magnitude relationship between the anode potential and the lithium potential so as to control the lithium battery to be charged according to the adjusted charging current. According to the method and the device, the charging current is dynamically adjusted through the size relationship between the anode potential and the lithium potential, and the charging current can be dynamically adjusted on the premise of ensuring the safety of the battery, so that the lithium deposition is effectively inhibited, the charging efficiency is improved, and the service life of the battery is prolonged.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a charging control method, charging control device, equipment and medium for lithium batteries. Background Technology

[0002] With the rapid development of portable electronic devices and electric vehicles, higher demands are being placed on the fast charging capabilities of lithium batteries. Traditional constant-current, constant-voltage charging methods are widely used due to their simple structure and ease of implementation. However, under conditions such as high charging rates, low temperatures, or battery aging, traditional charging methods have many technical shortcomings.

[0003] During lithium battery charging, if the potential of the anode (usually made of graphite) is lower than the deposition potential of metallic lithium, lithium ions will be reduced to metallic lithium on the anode surface and deposited (i.e., lithium deposition). Lithium deposition not only consumes active lithium and reduces battery capacity, but may also form lithium dendrites, which can penetrate the separator and cause internal short circuits, posing a safety hazard. Therefore, suppressing lithium deposition is one of the key technical challenges in improving the lifespan and safety of lithium batteries.

[0004] In existing technologies, lithium deposition is typically avoided by reducing charging current or limiting charging voltage, but this often sacrifices charging speed and affects user experience. Furthermore, traditional charging strategies lack a feedback mechanism for real-time battery status, failing to dynamically optimize charging parameters based on battery conditions, thus preventing the battery from reaching its maximum charging capacity. Summary of the Invention

[0005] In view of this, the purpose of this application is to provide a charging control method, charging control device, equipment, and medium for lithium batteries. This method involves real-time monitoring of the state parameters of the lithium battery, calculating the anode potential using these parameters, and dynamically adjusting the charging current based on the relationship between the anode potential and the lithium potential. This allows for dynamic adjustment of the charging current while ensuring battery safety, thereby effectively suppressing lithium deposition, improving charging efficiency, and extending battery life.

[0006] In a first aspect, embodiments of this application provide a charging control method for a lithium battery, the charging control method comprising: The current state parameters of the lithium battery are acquired in real time; wherein, the current state parameters include graphite open-circuit voltage, lithium potential, anode impedance and charging current; The current anode potential of the lithium battery is calculated based on the graphite open-circuit voltage, the anode impedance, and the charging current. The charging current of the lithium battery is dynamically adjusted based on the relationship between the anode potential and the lithium potential, so as to control the lithium battery to charge according to the adjusted charging current.

[0007] Furthermore, dynamically adjusting the charging current of the lithium battery based on the relationship between the anode potential and the lithium potential includes: When the anode potential is less than or equal to the lithium potential, the charging current is reduced so that the anode potential is higher than the lithium potential; When the anode potential is greater than the lithium potential, the charging current is increased.

[0008] Furthermore, after acquiring the current state parameters of the lithium battery in real time, the charging control method further includes: Obtain the current temperature value of the lithium battery; The anode impedance is adjusted based on the current temperature value, and the adjusted anode impedance is used as the new anode impedance.

[0009] Furthermore, after acquiring the current state parameters of the lithium battery in real time, the charging control method further includes: Obtain the battery aging parameters of the lithium battery; The anode impedance and the graphite open-circuit voltage are adjusted based on the battery aging parameters, and the adjusted anode impedance is used as the new anode impedance, and the adjusted graphite open-circuit voltage is used as the new graphite open-circuit voltage.

[0010] Furthermore, the charging control method also includes: The upper limit of the charging current of the lithium battery is determined based on the battery aging parameters to prevent the anode potential from falling below the lithium potential.

[0011] Furthermore, the battery aging parameters of the lithium battery are calculated through the following steps: Obtain the number of cycles of the lithium battery; The current actual capacity of the lithium battery is detected, and the capacity decay percentage is determined based on the current actual capacity and the initial nominal capacity of the lithium battery. The battery aging parameter is determined based on the number of cycles and the percentage of capacity decay.

[0012] Furthermore, the anode potential is calculated based on the graphite open-circuit voltage, the anode impedance, and the charging current using the following formula:

[0013] in, This indicates the anode potential. This represents the open-circuit voltage of the graphite. This indicates the charging current. This indicates the anode impedance.

[0014] Secondly, embodiments of this application also provide a charging control device for a lithium battery, the charging control device comprising: The parameter acquisition module is used to acquire the current state parameters of the lithium battery in real time; wherein, the current state parameters include graphite open circuit voltage, lithium potential, anode impedance and charging current; The calculation module is used to calculate the current anode potential of the lithium battery based on the graphite open-circuit voltage, the anode impedance, and the charging current. The current adjustment module is used to dynamically adjust the charging current of the lithium battery based on the relationship between the anode potential and the lithium potential, so as to control the lithium battery to charge according to the adjusted charging current.

[0015] Thirdly, embodiments of this application also provide an electronic device, including: a processor, a memory, and a bus. The memory stores machine-readable instructions executable by the processor. When the electronic device is running, the processor communicates with the memory via the bus. When the machine-readable instructions are executed by the processor, the steps of the lithium battery charging control method described above are performed.

[0016] Fourthly, embodiments of this application also provide a computer-readable storage medium storing a computer program, which, when executed by a processor, performs the steps of the lithium battery charging control method described above.

[0017] This application provides a lithium battery charging control method, charging control device, equipment, and medium. First, the current state parameters of the lithium battery are acquired in real time. These current state parameters include graphite open-circuit voltage, lithium potential, anode impedance, and charging current. Then, the current anode potential of the lithium battery is calculated based on the graphite open-circuit voltage, the anode impedance, and the charging current. Finally, the charging current of the lithium battery is dynamically adjusted based on the relationship between the anode potential and the lithium potential to control the lithium battery to charge according to the adjusted charging current. Thus, this application monitors the state parameters of the lithium battery in real time, calculates the anode potential using these parameters, and dynamically adjusts the charging current based on the relationship between the anode potential and the lithium potential. This allows for dynamic adjustment of the charging current while ensuring battery safety, effectively suppressing lithium deposition, improving charging efficiency, and extending battery life.

[0018] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 A flowchart illustrating a lithium battery charging control method provided in an embodiment of this application; Figure 2 This is one of the structural schematic diagrams of a lithium battery charging control device provided in an embodiment of this application; Figure 3 This is a second schematic diagram of the structure of a lithium battery charging control device provided in an embodiment of this application; Figure 4 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. Based on the embodiments of this application, every other embodiment obtained by those skilled in the art without inventive effort falls within the scope of protection of this application.

[0022] First, the applicable scenarios for this application will be introduced. This application can be applied to the field of battery technology.

[0023] With the rapid development of portable electronic devices and electric vehicles, higher demands are being placed on the fast charging capabilities of lithium batteries. Traditional constant-current, constant-voltage charging methods are widely used due to their simple structure and ease of implementation. However, under conditions such as high charging rates, low temperatures, or battery aging, traditional charging methods have many technical shortcomings.

[0024] During lithium battery charging, if the potential of the anode (usually made of graphite) is lower than the deposition potential of metallic lithium, lithium ions will be reduced to metallic lithium on the anode surface and deposited (i.e., lithium deposition). Lithium deposition not only consumes active lithium and reduces battery capacity, but may also form lithium dendrites, which can penetrate the separator and cause internal short circuits, posing a safety hazard. Therefore, suppressing lithium deposition is one of the key technical challenges in improving the lifespan and safety of lithium batteries.

[0025] Research has found that existing technologies typically avoid lithium deposition by reducing charging current or limiting charging voltage, but this often sacrifices charging speed and impacts user experience. Furthermore, traditional charging strategies lack a feedback mechanism for real-time battery status, failing to dynamically optimize charging parameters based on battery conditions, thus preventing the battery from reaching its maximum charging capacity.

[0026] Based on this, the present application provides a lithium battery charging control method that can dynamically adjust the charging current while ensuring battery safety, thereby effectively suppressing lithium deposition, improving charging efficiency, and extending battery life.

[0027] Please see Figure 1 , Figure 1 This is a flowchart illustrating a lithium battery charging control method provided in an embodiment of this application. Figure 1 As shown in the embodiments of this application, the charging control method includes: S101, acquires the current status parameters of the lithium battery in real time.

[0028] Regarding step S101 above, in specific implementation, when the lithium battery is in the charging process, the current state parameters of the lithium battery are acquired in real time. Specifically, the current state parameters include the graphite open-circuit voltage, lithium potential, anode impedance, and charging current of the lithium battery.

[0029] S102, calculate the current anode potential of the lithium battery based on the graphite open-circuit voltage, the anode impedance, and the charging current.

[0030] Regarding step S102 above, in specific implementation, the current anode potential of the lithium battery is calculated using the graphite open-circuit voltage, anode impedance, and charging current in the current state parameters of the lithium battery.

[0031] Specifically, for step S102 above, the anode potential is calculated using the following formula:

[0032] in, This indicates the anode potential. This represents the open-circuit voltage of the graphite. This indicates the charging current. This indicates the anode impedance.

[0033] S103, dynamically adjust the charging current of the lithium battery based on the relationship between the anode potential and the lithium potential, so as to control the lithium battery to charge according to the adjusted charging current.

[0034] Regarding step S103 above, in specific implementation, after the anode impedance is calculated, the anode potential is compared with the lithium potential obtained in step S101. Based on the relationship between the anode potential and the lithium potential, the charging current of the lithium battery is dynamically adjusted to control the lithium battery to charge according to the adjusted charging current.

[0035] Specifically, regarding step S103 above, dynamically adjusting the charging current of the lithium battery based on the relationship between the anode potential and the lithium potential includes: When the anode potential is less than or equal to the lithium potential, the charging current is reduced so that the anode potential is higher than the lithium potential.

[0036] When the anode potential is greater than the lithium potential, the charging current is increased.

[0037] During lithium battery charging, lithium ions are extracted from the positive electrode material, pass through the electrolyte, and embed into the negative electrode (anode) material (such as graphite). Within the normal operating range, the anode potential needs to be higher than the lithium metal deposition potential to prevent lithium metal deposition. In practice, the anode potential is compared to the lithium potential. When the anode potential is less than or equal to the lithium potential, the charging current is reduced. Referring to the formula for calculating the anode potential, reducing the charging current increases the anode potential, ensuring it remains above the lithium potential and preventing lithium deposition (avoiding damage to the solid electrolyte interphase (SEI) layer and lithium dendrite formation), thus ensuring battery safety. When the anode potential is greater than the lithium potential, the charging current is increased. This increases the charging speed while maintaining safety, shortening the charging time of the lithium battery. The maximum charging current can be used while avoiding lithium deposition, significantly reducing charging time and improving user charging efficiency and ease of use.

[0038] As an optional embodiment, after acquiring the current state parameters of the lithium battery in real time, the charging control method further includes: Obtain the current temperature value of the lithium battery; adjust the anode impedance based on the current temperature value, and use the adjusted anode impedance as the new anode impedance.

[0039] In the specific implementation of the above steps, after obtaining the current state parameters of the lithium battery, it is also necessary to obtain the current temperature value of the lithium battery. Here, the current temperature value of the lithium battery can be collected by a temperature sensor installed on the surface of the battery module or cell. Then, the anode impedance of the lithium battery is adjusted based on the current temperature value. The anode of a lithium battery (usually graphite material) exhibits different electrochemical behaviors at different temperatures, and its impedance characteristics change with temperature. Specifically: at low temperatures: the electrolyte viscosity increases, the lithium-ion diffusion rate decreases, leading to an increase in the anode interface impedance (SEI film impedance). at high temperatures: the stability of the SEI film decreases, which may trigger side reactions and may also affect the anode impedance. As an example, the anode impedance corresponding to the current temperature value can be obtained by looking up a table: an impedance-temperature mapping table is pre-established, and the anode impedance values ​​at different temperatures are obtained through experimental measurement or simulation to form the impedance-temperature mapping table. Based on the current temperature value, the closest anode impedance value is found in the mapping table as the currently adjusted anode impedance. If the temperature value is between two adjacent entries, linear interpolation or spline interpolation can be used for a more accurate estimate. Alternatively, an impedance-temperature mathematical model can be established: using electrochemical impedance spectroscopy (EIS) experimental data, a functional relationship between the anode impedance and temperature can be fitted, and the corresponding anode impedance can be determined based on this functional relationship. Then, the adjusted anode impedance can be used as the new anode impedance to prevent lithium deposition.

[0040] As an optional embodiment, after acquiring the current state parameters of the lithium battery in real time, the charging control method further includes: Obtain the battery aging degree parameters of the lithium battery; adjust the anode impedance and the graphite open circuit voltage based on the battery aging degree parameters, and use the adjusted anode impedance as the new anode impedance and the adjusted graphite open circuit voltage as the new graphite open circuit voltage.

[0041] In implementing the above steps, after obtaining the current state parameters of the lithium battery, it is also necessary to obtain the battery aging parameters. Then, the anode impedance and graphite open-circuit voltage of the lithium battery are adjusted based on these aging parameters. For example, the anode impedance and graphite open-circuit voltage corresponding to the battery aging parameters can be obtained through a lookup table: An impedance-open-circuit voltage-aging parameter mapping table is pre-established. Through experimental measurement or simulation, the anode impedance and open-circuit voltage under different aging parameters are obtained to form the mapping table. Based on the current battery aging parameters, the closest anode impedance value is found in the mapping table as the adjusted anode impedance, and the closest graphite open-circuit voltage is found as the adjusted graphite open-circuit voltage. Alternatively, a mathematical model of impedance-open-circuit voltage-aging parameters can be established to determine the corresponding anode impedance and graphite open-circuit voltage. Then, the adjusted anode impedance and the adjusted graphite open-circuit voltage are used again as the graphite open-circuit voltage to prevent lithium deposition.

[0042] As an optional embodiment, a temperature-battery aging parameter-anode impedance mapping table can be pre-established, and the corresponding anode impedance can be determined simultaneously using the temperature value and the battery aging parameter. Alternatively, a mathematical model of temperature value-battery aging parameter-anode impedance can be established, and the corresponding anode impedance can be determined through the model.

[0043] By addressing the two steps mentioned above, this application can maintain a high charging rate and good battery life even under adverse conditions such as low battery temperature or battery aging. Specifically, in low-temperature environments, the system increases the anode impedance weight and correspondingly reduces the charging current to avoid lithium deposition caused by a drop in anode potential; for aged batteries, the anode impedance and open-circuit voltage are adjusted according to their aging degree to ensure the safety and efficiency of the charging process.

[0044] As an optional embodiment, the battery aging parameter of the lithium battery is calculated through the following steps: A: Obtain the number of cycles of the lithium battery.

[0045] Here, the number of cycles refers to the number of times a battery completes a full cycle from being fully charged (100% SOC) to a certain cutoff voltage (e.g., 20% SOC or 0% SOC) and then fully charged.

[0046] Regarding step A above, in specific implementation, the number of cycles of the lithium battery is obtained. As an example, the charge and discharge capacity of the lithium battery can be recorded in real time by the fuel gauge chip in the battery management system (BMS). The total amount of electricity discharged by the BMS during each charge and discharge process is compared with the nominal capacity of the battery. When the total amount of electricity discharged reaches a complete nominal capacity value, it is considered as one cycle.

[0047] B: Detect the current actual capacity of the lithium battery, and determine the capacity decay percentage based on the current actual capacity and the initial nominal capacity of the lithium battery.

[0048] Regarding step B above, in specific implementation, the current actual capacity of the lithium battery is detected. As an example, the current actual capacity of the lithium battery can be detected using a standard capacity test method, or it can be estimated using Kalman filtering or extended Kalman filtering (EKF), or detected using an impedance spectroscopy electrochemical model; this application does not specifically limit the method. Then, the initial nominal capacity of the lithium battery is obtained. The initial nominal capacity can be obtained from the battery's nameplate information at the time of manufacture or a preset value in the BMS. Then, the capacity decay percentage is calculated based on the current actual capacity and the initial nominal capacity. Specifically, first, the difference between the initial nominal capacity and the current actual capacity is determined, and then the ratio of this difference to the initial nominal capacity is used as the capacity decay percentage.

[0049] C: Determine the battery aging parameter based on the number of cycles and the percentage of capacity decay.

[0050] Regarding step C above, in specific implementation, the battery aging parameters of the lithium battery are determined based on the number of cycles and the percentage of capacity decay. As an example, the battery aging parameters can be determined by weighted summation of the number of cycles and the percentage of capacity decay; alternatively, a pre-trained aging parameter prediction model can be used, with the number of cycles and the percentage of capacity decay input into the model to predict the battery aging parameters. This application does not specifically limit the method used in this way.

[0051] As an optional embodiment, the charging control method provided in this application further includes: The upper limit of the charging current of the lithium battery is determined based on the battery aging parameters to prevent the anode potential from falling below the lithium potential.

[0052] Regarding the above steps, in specific implementation, after determining the battery aging parameters of the lithium battery, to prevent lithium dendrite precipitation during high-current fast charging, the upper limit of the charging current of the lithium battery is reduced based on the battery aging parameters. Thus, the higher the battery aging parameter, the lower the upper limit of the charging current of the lithium battery. When increasing the charging current of the lithium battery, the upper limit of the charging current can be used to limit the charging current, preventing it from becoming excessive. According to the formula for calculating the anode potential, the lower the charging current, the higher the anode potential, thus preventing the anode potential from falling below the lithium potential. As an example, when determining the upper limit of the charging current, a mapping relationship between the aging parameters and the upper limit of the charging current can be pre-established using methods such as lookup tables, linear / nonlinear function mapping, and machine learning models. Then, based on the determined battery aging parameters, the corresponding upper limit of the charging current is determined from the mapping relationship. This application does not specifically limit this approach.

[0053] This application provides a lithium battery charging control method. First, the current state parameters of the lithium battery are acquired in real time. These parameters include graphite open-circuit voltage, lithium potential, anode impedance, and charging current. Then, the current anode potential of the lithium battery is calculated based on the graphite open-circuit voltage, anode impedance, and charging current. Finally, the charging current of the lithium battery is dynamically adjusted based on the relationship between the anode potential and the lithium potential to control the lithium battery to charge according to the adjusted charging current. In this way, this application monitors the state parameters of the lithium battery in real time, calculates the anode potential using these parameters, and dynamically adjusts the charging current based on the relationship between the anode potential and the lithium potential. This allows for dynamic adjustment of the charging current while ensuring battery safety, thereby effectively suppressing lithium deposition, improving charging efficiency, and extending battery life.

[0054] Please see Figure 2 , Figure 3 , Figure 2 This is one of the structural schematic diagrams of a lithium battery charging control device provided in an embodiment of this application. Figure 3 This is a second schematic diagram of a lithium battery charging control device provided in an embodiment of this application. Figure 2 As shown, the charging control device 200 includes: The parameter acquisition module 201 is used to acquire the current state parameters of the lithium battery in real time; wherein, the current state parameters include graphite open circuit voltage, lithium potential, anode impedance and charging current; Calculation module 202 is used to calculate the current anode potential of the lithium battery based on the graphite open-circuit voltage, the anode impedance, and the charging current; The current adjustment module 203 is used to dynamically adjust the charging current of the lithium battery based on the relationship between the anode potential and the lithium potential, so as to control the lithium battery to charge according to the adjusted charging current.

[0055] Furthermore, when the current adjustment module 203 is used to dynamically adjust the charging current of the lithium battery based on the relationship between the anode potential and the lithium potential, the current adjustment module 203 is also used to: When the anode potential is less than or equal to the lithium potential, the charging current is reduced so that the anode potential is higher than the lithium potential; When the anode potential is greater than the lithium potential, the charging current is increased.

[0056] Please see Figure 3 The charging control device 200 further includes a first parameter adjustment module 204, which, after acquiring the current state parameters of the lithium battery in real time, is used to: Obtain the current temperature value of the lithium battery; The anode impedance is adjusted based on the current temperature value, and the adjusted anode impedance is used as the new anode impedance.

[0057] Please see Figure 3 The charging control device 200 further includes a second parameter adjustment module 205, which, after acquiring the current state parameters of the lithium battery in real time, is used to: Obtain the battery aging parameters of the lithium battery; The anode impedance and the graphite open-circuit voltage are adjusted based on the battery aging parameters, and the adjusted anode impedance is used as the new anode impedance, and the adjusted graphite open-circuit voltage is used as the new graphite open-circuit voltage.

[0058] Furthermore, the second parameter adjustment module 205 is also used for: The upper limit of the charging current of the lithium battery is determined based on the battery aging parameters to prevent the anode potential from falling below the lithium potential.

[0059] Furthermore, the second parameter adjustment module 205 is also used to calculate the battery aging parameter of the lithium battery through the following steps: Obtain the number of cycles of the lithium battery; The current actual capacity of the lithium battery is detected, and the capacity decay percentage is determined based on the current actual capacity and the initial nominal capacity of the lithium battery. The battery aging parameter is determined based on the number of cycles and the percentage of capacity decay.

[0060] Furthermore, the calculation module 202 is also used to calculate the anode potential based on the graphite open-circuit voltage, the anode impedance, and the charging current using the following formula:

[0061] in, This indicates the anode potential. This represents the open-circuit voltage of the graphite. This indicates the charging current. This indicates the anode impedance.

[0062] Please see Figure 4 , Figure 4 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Figure 4 As shown, the electronic device 400 includes a processor 410, a memory 420, and a bus 430.

[0063] The memory 420 stores machine-readable instructions executable by the processor 410. When the electronic device 400 is running, the processor 410 communicates with the memory 420 via the bus 430. When the machine-readable instructions are executed by the processor 410, they can perform the operations described above. Figure 1 The specific implementation of the lithium battery charging control method in the method embodiment shown can be found in the method embodiment, and will not be repeated here.

[0064] This application also provides a computer-readable storage medium storing a computer program, which, when executed by a processor, can perform the above-described actions. Figure 1 The specific implementation of the lithium battery charging control method in the method embodiment shown can be found in the method embodiment, and will not be repeated here.

[0065] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0066] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. The apparatus embodiments described above are merely illustrative. For example, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. Furthermore, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Additionally, the shown or discussed mutual couplings, direct couplings, or communication connections may be through some communication interfaces; indirect couplings or communication connections between devices or units may be electrical, mechanical, or other forms.

[0067] The units described as separate components may or may not be physically separate. 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 can be selected to achieve the purpose of this embodiment according to actual needs.

[0068] In addition, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0069] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a processor-executable, non-volatile, computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0070] Finally, it should be noted that the above-described embodiments are merely specific implementations of this application, used to illustrate the technical solutions of this application, and not to limit them. The scope of protection of this application is not limited thereto. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the scope of the technology disclosed in this application. Such modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A charging control method for a lithium battery, characterized in that, The charging control method includes: The current state parameters of the lithium battery are acquired in real time; wherein, the current state parameters include graphite open-circuit voltage, lithium potential, anode impedance and charging current; The current anode potential of the lithium battery is calculated based on the graphite open-circuit voltage, the anode impedance, and the charging current. The charging current of the lithium battery is dynamically adjusted based on the relationship between the anode potential and the lithium potential, so as to control the lithium battery to charge according to the adjusted charging current.

2. The charging control method according to claim 1, characterized in that, The method of dynamically adjusting the charging current of the lithium battery based on the relationship between the anode potential and the lithium potential includes: When the anode potential is less than or equal to the lithium potential, the charging current is reduced so that the anode potential is higher than the lithium potential; When the anode potential is greater than the lithium potential, the charging current is increased.

3. The charging control method according to claim 1, characterized in that, After acquiring the current state parameters of the lithium battery in real time, the charging control method further includes: Obtain the current temperature value of the lithium battery; The anode impedance is adjusted based on the current temperature value, and the adjusted anode impedance is used as the new anode impedance.

4. The charging control method according to claim 1, characterized in that, After acquiring the current state parameters of the lithium battery in real time, the charging control method further includes: Obtain the battery aging parameters of the lithium battery; The anode impedance and the graphite open-circuit voltage are adjusted based on the battery aging parameters, and the adjusted anode impedance is used as the new anode impedance, and the adjusted graphite open-circuit voltage is used as the new graphite open-circuit voltage.

5. The charging control method according to claim 4, characterized in that, The charging control method further includes: The upper limit of the charging current of the lithium battery is determined based on the battery aging parameters to prevent the anode potential from falling below the lithium potential.

6. The charging control method according to claim 4, characterized in that, The battery aging parameters of the lithium battery are calculated using the following steps: Obtain the number of cycles of the lithium battery; The current actual capacity of the lithium battery is detected, and the capacity decay percentage is determined based on the current actual capacity and the initial nominal capacity of the lithium battery. The battery aging parameter is determined based on the number of cycles and the percentage of capacity decay.

7. The charging control method according to claim 1, characterized in that, The anode potential is calculated using the following formula, based on the graphite open-circuit voltage, the anode impedance, and the charging current: in, This indicates the anode potential. This represents the open-circuit voltage of the graphite. This indicates the charging current. This indicates the anode impedance.

8. A charging control device for a lithium battery, characterized in that, The charging control device includes: The parameter acquisition module is used to acquire the current state parameters of the lithium battery in real time; wherein, the current state parameters include graphite open circuit voltage, lithium potential, anode impedance and charging current; The calculation module is used to calculate the current anode potential of the lithium battery based on the graphite open-circuit voltage, the anode impedance, and the charging current. The current adjustment module is used to dynamically adjust the charging current of the lithium battery based on the relationship between the anode potential and the lithium potential, so as to control the lithium battery to charge according to the adjusted charging current.

9. An electronic device, characterized in that, include: The device includes a processor, a memory, and a bus. The memory stores machine-readable instructions executable by the processor. When the electronic device is running, the processor communicates with the memory via the bus. The machine-readable instructions are executed by the processor to perform the steps of the charging control method for a lithium battery as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, performs the steps of the charging control method for a lithium battery as described in any one of claims 1 to 7.

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