Lithium plating window determination methods, apparatus, equipment, storage media, and program products

Abstract

This application relates to a method for determining a lithium plating window. This method obtains the correspondence between the state of charge (SOC) and anode potential of a target battery during charging, and determines the target lithium plating window based on this correspondence. The target battery includes a first battery and a second battery, where both the first and second batteries are lithium plating batteries. The method provided in this application does not require measuring the overpotential corresponding to lithium plating; it only needs to obtain the correspondence between the SOC and anode potential of the first battery (which has undergone lithium plating treatment) and the second battery (which has not undergone lithium plating treatment), and determine the target lithium plating window based on this correspondence, thus improving the accuracy of the determined target lithium plating window.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a method, apparatus, device, storage medium, and program product for determining the lithium plating window. Background Technology

[0002] Lithium plating is a type of degradation in lithium-ion batteries. After lithium plating occurs, the battery's lifespan declines more rapidly, and continued use poses safety risks. Therefore, determining the optimal lithium plating window for lithium-ion batteries is crucial.

[0003] In related technologies, imaging methods such as the three-electrode method, optical methods, and scanning electron microscopy are commonly used to determine the lithium plating window of a battery. However, the accuracy of the lithium plating window obtained from batteries is currently low. Summary of the Invention

[0004] To address the aforementioned issues, this application provides a method, apparatus, device, storage medium, and program product for determining the lithium plating window, which can improve the accuracy of the lithium plating window obtained from the battery.

[0005] In a first aspect, this application provides a method for determining a lithium plating window, the method comprising:

[0006] Obtain the correspondence between the state of charge and anode potential of the target battery during the charging process. The target battery includes a first battery and a second battery. The first battery is a lithium-plated battery, and the second battery is a non-lithium-plated battery.

[0007] Based on the correspondence, the target lithium plating window of the target battery is determined.

[0008] In the technical solution of this application embodiment, the target lithium plating window of the target battery is determined by obtaining the correspondence between the state of charge and the anode potential of the target battery during the charging process. The target battery includes a first battery and a second battery, where the first battery is a lithium-plated battery and the second battery is a non-lithium-plated battery. The method provided in this application embodiment does not require measuring the overpotential corresponding to lithium plating; it only needs to obtain the correspondence between the state of charge and the anode potential of the first battery after lithium plating treatment and the second battery without lithium plating treatment, and determine the target lithium plating window based on this correspondence, thus improving the accuracy of the determined target lithium plating window.

[0009] In some embodiments, obtaining the correspondence between the state of charge and anode potential of the target battery during charging includes:

[0010] Based on the test conditions, obtain the corresponding relationship between the target battery and the test conditions during the charging process.

[0011] In the technical solution of this application embodiment, based on different test conditions, the corresponding relationship of the target battery under the test conditions during the charging process can be obtained, providing diversity in obtaining the corresponding relationship and laying the foundation for determining different target lithium plating windows based on the corresponding relationship under different test conditions.

[0012] In some embodiments, the test conditions include multiple charge rates at the same temperature; determining the target lithium plating window of the target battery based on the corresponding relationship includes:

[0013] Based on the corresponding relationship of the target battery at various charging rates, the target lithium plating window of the target battery is determined.

[0014] In the technical solution of this application embodiment, the target lithium plating window of the target battery at different charging rates is obtained by based on the correspondence between multiple charging rates at the same temperature. Since the charging rate corresponding to the target lithium plating window can reflect the charging capacity of the target battery, the accuracy of the charging capacity of the target battery at different charging rates determined based on the target lithium plating window at different charging rates is improved. Furthermore, the target lithium plating window can provide a basis for battery design optimization and charging strategy formulation.

[0015] In some embodiments, determining the target lithium plating window of the target battery based on the corresponding relationship of the target battery at various charging rates includes:

[0016] Based on the corresponding relationship of the target battery at each charging rate, determine the initial lithium plating window corresponding to each charging rate;

[0017] The target lithium plating window is determined based on the initial lithium plating window corresponding to each charging rate.

[0018] In the technical solution of this application embodiment, the initial lithium plating window corresponding to each charging rate is determined according to the correspondence of the target battery at each charging rate. Then, the target lithium plating window is determined according to the initial lithium plating window corresponding to each charging rate. The maximum charging rate of the target battery under different states of charge can be obtained according to the target lithium plating window, thereby improving the accuracy of the charging capability of the battery obtained under different states of charge.

[0019] In some embodiments, the correspondence includes the first anode potential curve of the first battery and the second anode potential curve of the second battery; determining the initial lithium plating window corresponding to each charging rate based on the correspondence of the target battery at each charging rate includes:

[0020] Determine the difference between the first anode potential curve and the second anode potential curve at each charging rate;

[0021] The initial lithium plating window for each charging rate is determined based on the difference value and the preset difference value corresponding to each charging rate.

[0022] In the technical solution of this application embodiment, the difference between the first anode potential curve and the second anode potential curve at each charging rate is determined, and the initial lithium plating window corresponding to each charging rate is determined based on the difference value corresponding to each charging rate and a preset difference value. Since the initial lithium plating window can be determined by the difference value, this method is relatively simple to implement and can improve the efficiency of obtaining the initial lithium plating window.

[0023] In some embodiments, determining a target lithium plating window based on the initial lithium plating window corresponding to each charging rate includes:

[0024] The target lithium plating window is determined by fitting the initial lithium plating window at each charging rate.

[0025] In the technical solution of this application embodiment, the initial lithium plating window at each charging rate is fitted to determine the target lithium plating window. Since the target lithium plating window is determined by fitting, it is not necessary to obtain the initial lithium plating window at all charging rates to obtain the target lithium plating window, thereby simplifying the testing process of the target lithium plating window and improving the testing efficiency of the target lithium plating window.

[0026] In some embodiments, the test conditions include multiple preset temperatures at the same charging rate, and the target lithium plating window of the target battery is determined according to the correspondence, including:

[0027] The target lithium plating window of the target battery is determined based on the corresponding relationship of the target battery at various preset temperatures.

[0028] In the technical solution of this application embodiment, the target lithium plating window of the target battery at different preset temperatures is obtained by based on the correspondence between multiple preset temperatures under the same charging rate. Since the charging rate corresponding to the target lithium plating window can reflect the charging capacity of the target battery, the accuracy of the charging capacity of the target battery at different preset temperatures determined based on the target lithium plating window at different preset temperatures is improved, and the target lithium plating window can provide a basis for battery design optimization and charging strategy formulation.

[0029] In some embodiments, the target lithium plating window of the target battery is determined based on the corresponding relationship of the target battery at various preset temperatures, including:

[0030] Based on the corresponding relationship of the target battery at each preset temperature, the initial lithium plating window corresponding to the anode potential curve at each preset temperature is determined;

[0031] The target lithium plating window is determined based on the initial lithium plating window corresponding to each preset temperature.

[0032] In the technical solution of this application embodiment, the initial lithium plating window corresponding to each preset temperature is determined according to the correspondence of the target battery at each preset temperature. Then, the target lithium plating window is determined according to the initial lithium plating window corresponding to each preset temperature. The maximum charging rate of the target battery at different preset temperatures can be obtained according to the target lithium plating window, thereby improving the accuracy of the charging capacity of the battery obtained at different preset temperatures.

[0033] In some embodiments, the correspondence includes the first anode potential curve of the first battery and the second anode potential curve of the second battery; determining the initial lithium plating window corresponding to the anode potential curve at each preset temperature based on the correspondence of the target battery at each preset temperature includes:

[0034] Determine the difference between the first anode potential curve and the second anode potential curve at each preset temperature;

[0035] Based on the difference value corresponding to each preset temperature and the preset difference value, the initial lithium plating window corresponding to each preset temperature is determined.

[0036] In the technical solution of this application embodiment, the difference value between the first anode potential curve and the second anode potential curve at each preset temperature is determined, and the initial lithium plating window corresponding to each preset temperature is determined based on the difference value corresponding to each preset temperature and the preset difference value. Since the initial lithium plating window can be determined by the difference value, the method is relatively simple to implement and can improve the efficiency of obtaining the initial lithium plating window.

[0037] In some embodiments, determining the target lithium plating window based on the initial lithium plating window corresponding to each preset temperature includes:

[0038] The target lithium plating window is determined by fitting the initial lithium plating window at each preset temperature.

[0039] In the technical solution of this application embodiment, the target lithium plating window is determined by fitting the initial lithium plating window at each preset temperature. Since the target lithium plating window is determined by fitting, it is not necessary to obtain the initial lithium plating window at all preset temperatures, thereby simplifying the testing process for the target lithium plating window and improving the testing efficiency.

[0040] In some embodiments, the first battery is a battery that has undergone a preset number of charge-discharge cycles at a first charge-discharge rate, and the second battery is a battery that has undergone a preset number of charge-discharge cycles at a second charge-discharge rate; the first charge-discharge rate is greater than the second charge-discharge rate.

[0041] In the technical solution of this application embodiment, the first battery is a battery that has undergone a preset number of charge-discharge cycles at a first charge-discharge rate, and the second battery is a battery that has undergone a preset number of charge-discharge cycles at a second charge-discharge rate; the first charge-discharge rate is greater than the second charge-discharge rate. By setting the same number of cycles to perform lithium plating treatment on the first battery and performing no lithium plating treatment on the second battery, the consistency of the pretreatment conditions of the first and second batteries is ensured, except for the charging rate or preset temperature. This makes the accuracy of the target lithium plating window determined when performing lithium plating tests based on the first and second batteries higher.

[0042] Secondly, this application also provides a lithium plating window determining apparatus, the apparatus comprising:

[0043] The acquisition module is used to acquire the correspondence between the state of charge and the anode potential of the target battery during the charging process. The target battery includes a first battery and a second battery. The first battery is a battery that has undergone lithium plating treatment, and the second battery is a battery that has not undergone lithium plating treatment.

[0044] The determination module is used to determine the target lithium plating window of the target battery based on the corresponding relationship.

[0045] Thirdly, this application also provides a computer device, which includes a memory and a processor. The memory stores a computer program, and the processor executes the computer program to implement any of the steps in the first aspect described above.

[0046] Fourthly, this application also provides a computer-readable storage medium. The computer-readable storage medium stores a computer program thereon, which, when executed by a processor, implements any of the steps described in the first aspect.

[0047] Fifthly, this application also provides a computer program product, which includes a computer program that, when executed by a processor, implements any of the steps described in the first aspect. Attached Figure Description

[0048] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the alternative embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0049] Figure 1 This is a schematic diagram illustrating the principle of the lithium plating window determination method provided in the embodiments of this application;

[0050] Figure 2This application provides an illustration of the application environment for a lithium plating window determination method.

[0051] Figure 3 This is a flowchart illustrating a method for determining a lithium plating window provided in an embodiment of this application;

[0052] Figure 4 This is a flowchart illustrating a method for determining a target lithium plating window provided in an embodiment of this application;

[0053] Figure 5 This is a flowchart illustrating a method for determining an initial lithium plating window provided in an embodiment of this application;

[0054] Figure 6 This is a schematic diagram of an anode potential curve provided in an embodiment of this application;

[0055] Figure 7 This is another schematic diagram of an anode potential curve provided in an embodiment of this application;

[0056] Figure 8 This is a flowchart illustrating another method for determining the target lithium plating window provided in an embodiment of this application;

[0057] Figure 9 This is a flowchart illustrating another method for determining the initial lithium plating window provided in an embodiment of this application;

[0058] Figure 10 This is a structural block diagram of a lithium plating window determination device provided in an embodiment of this application;

[0059] Figure 11 This is an internal structural diagram of a computer device according to an embodiment of this application. Detailed Implementation

[0060] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0061] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0062] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0063] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0064] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0065] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0066] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0067] Lithium plating is a type of degradation in lithium-ion batteries. After lithium plating occurs, the battery's lifespan declines more rapidly, and continued use poses safety risks. Therefore, determining the optimal lithium plating window for lithium-ion batteries is crucial.

[0068] In related technologies, imaging methods such as the three-electrode method, optical methods, and scanning electron microscopy are commonly used to determine the lithium plating window of a battery. Other methods include electrochemical impedance spectroscopy, impedance-based methods using DC impedance, high-precision coulombic efficiency testing, battery expansion force or thickness testing, ultrasonic imaging, charging voltage relaxation (e.g., dV / dt), thermal analysis, and neutron imaging. However, these methods introduce polarization during charging, which leads to overpotentials in lithium plating. Currently, no method can accurately measure these overpotentials, resulting in low accuracy of the obtained lithium plating window. For example, the three-electrode method typically uses the thermodynamic lithium plating potential (0mV if using a lithium three-electrode). However, due to ohmic polarization, diffusion-induced polarization, and electrochemical polarization during charging, these polarizations create overpotentials for lithium plating. This overpotential is closely related to battery design and testing temperature, and currently, no method can accurately measure it, thus failing to obtain the true lithium plating window. Alternatively, the thermodynamic lithium plating potential (assuming an overpotential of 0) can be used to determine the lithium plating window, but the obtained results are often low. Due to increased polarization and larger overpotential at low temperatures, the lithium plating window is lower than expected.

[0069] To improve the accuracy of the lithium plating window, in this embodiment, the target lithium plating window is determined based on the correspondence between the state of charge and anode potential of the target battery during charging. To more clearly illustrate this embodiment, it is discussed below in conjunction with... Figure 1 The technical principles upon which the embodiments of this application are based will be explained. Figure 1 This is a schematic diagram illustrating the principle of the lithium plating window determination method provided in the embodiments of this application.

[0070] like Figure 1 As shown, Figure 1 This is a schematic diagram illustrating the principle of determining the lithium plating window according to an embodiment of this application. Figure 3 It includes battery 100 and battery 200. Battery 100 and battery 200 include electrolyte 10 and negative electrode 20. The four batteries 100 in the first row from left to right represent different states of battery 100. The four batteries 200 in the second row from left to right represent different states of battery 200.

[0071] in, Figure 1The first row of four batteries 100, from left to right, shows the following states: the first battery 100 is in its initial state; the second battery 100 is in its state after high-rate charging, with a layer of metallic lithium 30 (dendritic) on the surface of the negative electrode 20; the third battery 100 is in its fully discharged state, where most of the lithium 30 participates in the discharge, with only a small amount of lithium debris 40 remaining. The remaining lithium debris 40 does not make conductive contact with the surface of the negative electrode 20, otherwise it would continue to participate in the discharge and dissolve; the fourth battery 100 is in its state after recharging (lithium plating window test). When the first battery plating lithium, the lithium 30 conducts the lithium debris 40, establishing a conductive connection. After establishing the conductive connection, the correspondence between the state of charge and the anode potential of the first battery during the charging process can be obtained.

[0072] in, Figure 1 From left to right, the state of the first battery 200 in the second row is the initial state of the battery 200; the state of the second battery 200 is the state after the battery 200 has been charged at a low rate and has not yet produced lithium plating; the state of the third battery 200 is the state after the battery 200 is fully discharged; the state of the fourth battery 200 is the state of the battery 200 (i.e., the second battery) being recharged (lithium plating window test). Due to the large rate, the battery 200 has produced lithium plating. The correspondence between the state of charge and the anode potential of the second battery during the charging process is obtained.

[0073] Obviously, comparing the states of battery 100 and battery 200, it can be seen that during the charging process of the first and second batteries according to the charging rate, lithium plating did not occur in either battery at the beginning. At this time, the lithium debris 40 in the first battery did not come into contact with the negative electrode plate and would not affect the lithium intercalation of the negative electrode 20. Therefore, the magnitude of the anode potential of the first and second batteries under the same state of charge is the same.

[0074] After a period of charging, lithium plating occurs in both the first and second batteries. Since the first battery has undergone lithium plating treatment, there are residual lithium debris 40 on its surface. The newly formed lithium metal 30 (dendritic) in the first battery will connect with the residual lithium debris 40 from the previous lithium plating treatment, increasing the surface area of ​​the lithium metal 30, i.e., increasing the electrode area, which leads to a decrease in current density (with the charging current remaining constant, the increased electrode area results in a decrease in density). Therefore, the electrochemical polarization of the first battery is lower than that of the second battery without lithium plating. The anode potential of the first battery and the anode potential of the second battery separate. Therefore, the target lithium plating window can be determined based on the state of charge corresponding to the separation of the anode potential.

[0075] Based on the above technical principles, the lithium plating window can be determined according to the correspondence between the state of charge and the anode potential during the charging process, without the need to measure the overpotential corresponding to the occurrence of lithium plating in the battery, thereby improving the accuracy of the determined target lithium plating window.

[0076] This application provides a method for determining the lithium plating window, which can be applied to, for example... Figure 2 The application environment shown. Figure 2 This application environment diagram illustrates a lithium plating window determination method provided in an embodiment of this application. The application environment includes a computer device, which may be a server. Its internal structure diagram is shown below. Figure 2 As shown, the computer device includes a processor, memory, and a network interface connected via a system bus. The processor provides computing and control capabilities. The memory includes a non-volatile storage medium and internal memory. The non-volatile storage medium stores an operating system, computer programs, and a database. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage medium. The database stores data related to the lithium plating window of the battery. The network interface communicates with external terminals via a network connection. When executed by the processor, the computer program implements a method for determining the lithium plating window.

[0077] According to some embodiments of this application, refer to Figure 3 , Figure 3 This is a flowchart illustrating a method for determining a lithium plating window according to an embodiment of this application. This method is applied to, for example... Figure 2 The computer device shown in the figure, the method may include the following steps:

[0078] S301, Obtain the correspondence between the state of charge and the anode potential of the target battery during the charging process. The target battery includes a first battery and a second battery. The first battery is a lithium-plated battery, and the second battery is a non-lithium-plated battery.

[0079] In this embodiment, the first battery is a battery that has undergone a first number of charge-discharge cycles at a first charge-discharge rate, and the second battery is a battery that has undergone a second number of charge-discharge cycles at a second charge-discharge rate. The first charge-discharge rate is used to induce lithium plating in the first battery, and the second charge-discharge rate is used to prevent lithium plating in the second battery. For example, battery A is charged and discharged using the first charge-discharge rate to induce lithium plating, thus obtaining the first battery; battery B is charged and discharged using the second charge-discharge rate to prevent lithium plating, thus obtaining the second battery.

[0080] One cycle is defined as a battery being fully charged and then fully discharged once. The first cycle number and the second cycle number can be different.

[0081] In this embodiment of the application, the correspondence between the state of charge and the anode potential of the target battery during the charging process is obtained. This correspondence can be a curve-like correspondence between the state of charge and the anode potential, or a list-like correspondence.

[0082] In some possible implementations, the correspondence between the state of charge (SOC) and anode potential of the target battery during charging can be obtained in real time. That is, the correspondence between the SOC and anode potential of the target battery during charging is acquired simultaneously. Alternatively, the correspondence between the SOC and anode potential of the target battery during charging can be acquired all at once. In this case, the correspondence between the SOC and anode potential of the target battery during charging is pre-stored, and the computer device, after receiving an operation command triggered by the user, retrieves the correspondence between the SOC and anode potential of the target battery during charging according to the operation command.

[0083] S302, Based on the correspondence, determine the target lithium plating window of the target battery.

[0084] In this embodiment of the application, based on the first correspondence of the first battery and the second correspondence of the second battery in the correspondence relationship, the state of charge corresponding to the separation of the anode potential in the first correspondence relationship and the second correspondence relationship is determined, and the target lithium plating window of the target battery is determined based on the state of charge obtained from the correspondence relationship.

[0085] Optionally, you can obtain only one set of correspondences or multiple sets of correspondences. For example, under a certain test condition, obtaining the correspondences under that test condition can yield the state of charge (SOC) of the target battery under that test condition, and the SOC determined under that test condition can be used as the target lithium plating window.

[0086] After obtaining multiple sets of correspondences, since each set of correspondences can correspond to different test conditions, the state of charge corresponding to the separation of the anode potential under each test condition is determined based on each set of correspondences, thereby obtaining multiple states of charge corresponding to multiple test conditions. The multiple states of charge are fitted to obtain the target lithium plating window, and the correspondence between the specific variables in the test conditions of the target lithium plating window and the state of charge is obtained.

[0087] The lithium plating window determination method provided in this application embodiment obtains the correspondence between the state of charge and anode potential of the target battery during charging, and determines the target lithium plating window of the target battery based on this correspondence. The target battery includes a first battery and a second battery, where the first battery has undergone lithium plating treatment, and the second battery has not undergone lithium plating treatment. The method provided in this application embodiment does not require measuring the overpotential corresponding to lithium plating; it only needs to obtain the correspondence between the state of charge and anode potential of the lithium-plated first battery and the unplated second battery, and determine the target lithium plating window based on this correspondence, thus improving the accuracy of the determined target lithium plating window.

[0088] According to some embodiments of this application, obtaining the correspondence between the state of charge and the anode potential of the target battery during the charging process may include: obtaining the correspondence between the target battery and the test conditions during the charging process according to the test conditions.

[0089] The test conditions include multiple charging rates at the same temperature and multiple preset temperatures at the same charging rate.

[0090] In this embodiment, under the same temperature and multiple charging rates, with a fixed preset temperature, the charging rate is continuously changed to obtain the correspondence between the state of charge (SOC) and anode potential of the first and second batteries during the charging process at different charging rates. For example, the correspondence between the SOC and anode potential of the first battery and the second battery during the charging process is obtained at a preset temperature of 20 degrees Celsius and a charging rate of 0.5C. Similarly, the correspondence between the SOC and anode potential of the first battery and the second battery during the charging process is obtained at a preset temperature of 20 degrees Celsius and a charging rate of 2C.

[0091] Similarly, under the same charging rate and multiple preset temperatures, with a fixed charging rate and varying preset temperatures, the correspondence between the state of charge (SOC) and anode potential of the target battery during charging at these preset temperatures is obtained. For example, the correspondence between the SOC and anode potential of the first battery and the second battery during charging is obtained at a 0.5C charging rate and a preset temperature of 20 degrees Celsius; the correspondence between the SOC and anode potential of the first battery and the second battery during charging is also obtained at a 0.5C charging rate and a preset temperature of 25 degrees Celsius.

[0092] In the technical solution of this application embodiment, based on different test conditions, the corresponding relationship of the target battery under the test conditions during the charging process can be obtained, providing diversity in obtaining the corresponding relationship and laying the foundation for determining different target lithium plating windows based on the corresponding relationship under different test conditions.

[0093] According to some embodiments of this application, the test conditions may include the following two types of test conditions, thus, the target lithium plating window can be determined under two different test conditions.

[0094] The first scenario involves test conditions including multiple charging rates at the same preset temperature. Based on the correspondence, the target lithium plating window of the target battery is determined, including: determining the target lithium plating window of the target battery based on the correspondence of the target battery at each charging rate.

[0095] In this embodiment, at the same preset temperature, based on the correspondence of the target battery at various charging rates, the point where the anode potential separates under the same state of charge in the correspondence of the first battery and the correspondence of the second battery is determined. The state of charge corresponding to the point where the anode potential separates is taken as the initial lithium plating window of the target battery at that temperature and charging rate. Based on the initial lithium plating windows at multiple charging rates obtained at the preset temperature, the correspondence between each charging rate and the initial lithium plating window at each charging rate is obtained, and the obtained correspondence is the target lithium plating window.

[0096] In the technical solution of this application embodiment, the target lithium plating window of the target battery at different charging rates is obtained by based on the correspondence between multiple charging rates at the same temperature. Since the charging rate corresponding to the target lithium plating window can reflect the charging capacity of the target battery, the accuracy of the charging capacity of the target battery at different charging rates determined based on the target lithium plating window at different charging rates is improved. Furthermore, the target lithium plating window can provide a basis for battery design optimization and charging strategy formulation.

[0097] The following examples illustrate in detail how to determine the target lithium plating window of the target battery under the two test conditions described above.

[0098] According to some embodiments of this application, refer to Figure 4 , Figure 4 This is a flowchart illustrating a method for determining a target lithium plating window according to an embodiment of this application. It includes a flowchart illustrating the determination of the target lithium plating window of a target battery under multiple charge rates at the same temperature, and may include the following steps:

[0099] S401, determine the initial lithium plating window corresponding to each charging rate based on the corresponding relationship of the target battery at each charging rate.

[0100] In this embodiment, the state of charge (SOC) and anode potential of the first and second batteries at various charging rates can be fitted to obtain the first anode potential curve of the first battery and the second anode potential curve of the second battery, respectively. Further, the first slope of the first anode potential curve and the second slope of the second anode potential curve under different SOCs are determined. If, under multiple consecutive SOCs, the first slope is greater than the second slope, then the smallest SOC among these consecutive SOCs is determined as the initial lithium plating window corresponding to that charging rate.

[0101] In some possible implementations, the anode potentials at the same charging rate and the same state of charge can be directly compared. If the anode potential of the first battery in multiple consecutive states of charge is greater than that of the second battery in the same state of charge, then the minimum state of charge among the multiple consecutive states of charge is taken as the initial lithium plating window of the target battery.

[0102] S402, determine the target lithium plating window based on the initial lithium plating window corresponding to each charging rate.

[0103] In this embodiment, the charging rate intervals can be divided into very small intervals to test the lithium plating window, obtaining the initial lithium plating window corresponding to all charging rates. The state of charge is used as the horizontal axis and the charging rate as the vertical axis, and all charging rates are connected to obtain the correspondence between the state of charge and the charging rate at a preset temperature; or the initial lithium plating window at some charging rates is obtained, and the initial lithium plating window at each charging rate is fitted to obtain the target lithium plating window.

[0104] In the technical solution of this application embodiment, the initial lithium plating window corresponding to each charging rate is determined according to the correspondence of the target battery at each charging rate. Then, the target lithium plating window is determined according to the initial lithium plating window corresponding to each charging rate. The maximum charging rate of the target battery under different states of charge can be obtained according to the target lithium plating window, thereby improving the accuracy of the charging capability of the battery obtained under different states of charge.

[0105] According to some embodiments of this application, refer to Figure 5 , Figure 5 This is a flowchart illustrating a method for determining an initial lithium plating window according to an embodiment of this application. The correspondence includes the first anode potential curve of the first battery and the second anode potential curve of the second battery. Determining the initial lithium plating window corresponding to each charging rate based on the correspondence may include the following steps:

[0106] S501, determine the difference between the first anode potential curve and the second anode potential curve at each charging rate.

[0107] In this embodiment, for the first anode potential curve and the second anode potential curve under the same charging rate, the difference between the anode potential on the first anode potential curve and the anode potential on the second curve is determined under the same state of charge. For example, at a charging rate of 0.2C, with a state of charge of 10%, the anode potential on the first anode potential curve is 0.2, and the anode potential on the second curve is 0.19. The difference value corresponding to the 10% state of charge is 0.01.

[0108] S502 determines the initial lithium plating window corresponding to each charging rate based on the difference value corresponding to each charging rate and the preset difference value.

[0109] Optionally, the preset difference value is 0.001, 0.002, etc.

[0110] In this embodiment, the difference value corresponding to each charging rate can be directly compared with a preset difference value. If the difference value is greater than the preset difference value, the state of charge corresponding to the difference value is determined as the initial lithium plating window at that charging rate. For example, if the preset temperature is 10 degrees Celsius, the preset difference value is 0.001 at a 0.2C charging rate, the difference value is 0 at 9% state of charge, 0.01 at 10% state of charge, and 0.02 at 11% state of charge. Then, the 10% state of charge is determined as the initial lithium plating window of the target battery at a preset temperature of 10 degrees Celsius and a 0.2C charging rate.

[0111] In some possible implementations, the quotient between the difference value and a preset difference value can also be determined. If the quotient is greater than 1, the state of charge corresponding to the quotient greater than 1 is determined as the initial lithium plating window at that charging rate. For example, if the preset temperature is 10 degrees Celsius, the preset difference value is 0.001 at a charging rate of 0.2C, the quotient between the difference value corresponding to 9% state of charge and the preset difference value is 0, the quotient between the difference value corresponding to 10% state of charge and the preset difference value is 10, and the quotient between the difference value corresponding to 11% state of charge and the preset difference value is 20, then the 10% state of charge is determined as the initial lithium plating window for the target battery at a preset temperature of 10 degrees Celsius and a charging rate of 0.2C.

[0112] like Figure 6 and Figure 7 As shown, Figure 6 This is a schematic diagram of an anode potential curve provided in an embodiment of this application. Figure 7 This is another schematic diagram of the anode potential curve provided in the embodiments of this application. Figure 6 This is a schematic diagram of the anode potential curve at a preset temperature of -20 degrees Celsius and 0.5°C, including a first anode potential curve 601 and a second anode potential curve 602. Figure 7 for Figure 6 The enlarged schematic diagrams show the first anode potential curve 701 and the second anode potential curve 702, with the horizontal axis representing the state of charge (SOC) and the vertical axis representing the anode potential. According to the method for determining the initial lithium plating window corresponding to each charging rate provided in the embodiments of this application, the initial lithium plating window of the target battery at -20 degrees Celsius and 0.5C is 16% SOC.

[0113] Similarly, the lithium plating window at other charging rates can be tested using the method provided in the embodiments of this application.

[0114] In the technical solution of this application embodiment, the difference between the first anode potential curve and the second anode potential curve at each charging rate is determined, and the initial lithium plating window corresponding to each charging rate is determined based on the difference value corresponding to each charging rate and a preset difference value. Since the initial lithium plating window can be determined by the difference value, this method is relatively simple to implement and can improve the efficiency of obtaining the initial lithium plating window.

[0115] According to some embodiments of this application, determining the target lithium plating window based on the initial lithium plating window corresponding to each charging rate may further include: fitting each charging rate and the initial lithium plating window at each charging rate to determine the target lithium plating window.

[0116] In some possible implementations, after obtaining the initial lithium plating window at each charging rate, the initial lithium plating window at each charging rate can be fitted to obtain the target lithium plating window. For example, fitting methods such as least squares method or analytical expression approximation of discrete data can be used.

[0117] In the technical solution of this application embodiment, the initial lithium plating window at each charging rate is fitted to determine the target lithium plating window. Since the target lithium plating window is determined by fitting, it is not necessary to obtain the initial lithium plating window at all charging rates to obtain the target lithium plating window, thereby simplifying the testing process of the target lithium plating window and improving the testing efficiency of the target lithium plating window.

[0118] As can be seen from the above embodiments, the second case is that the test conditions include multiple preset temperatures under the same charging rate. Based on the correspondence, the target lithium plating window of the target battery is determined, which may include: determining the target lithium plating window of the target battery based on the correspondence of the target battery at each preset temperature.

[0119] In the embodiments of this application, similarly, under the same charging rate, based on the correspondence of the target battery at each preset temperature, the point where the anode potential separates under the same state of charge in the correspondence of the first battery and the correspondence of the second battery is determined, and the state of charge corresponding to the point where the anode potential separates is used as the initial lithium plating window of the target battery under the preset temperature and charging rate.

[0120] In some possible implementations, the initial lithium plating window at each preset temperature is obtained, and the correspondence between each preset temperature and the initial lithium plating window at each preset temperature is the target lithium plating window.

[0121] Furthermore, the first test condition in the above embodiment and the second test condition in this embodiment can be integrated to obtain the correspondence between the initial lithium plating windows at each preset temperature and each charging rate, and to determine the target lithium plating window of the target battery.

[0122] In the technical solution of this application embodiment, the target lithium plating window of the target battery at different preset temperatures is obtained by based on the correspondence between multiple preset temperatures under the same charging rate. Since the charging rate corresponding to the target lithium plating window can reflect the charging capacity of the target battery, the accuracy of the charging capacity of the target battery at different preset temperatures determined based on the target lithium plating window at different preset temperatures is improved, and the target lithium plating window can provide a basis for battery design optimization and charging strategy formulation.

[0123] According to some embodiments of this application, refer to Figure 8 , Figure 8 This is a flowchart illustrating another method for determining the target lithium plating window provided in this application embodiment. Under the condition of multiple preset temperatures at the same charging rate, the flowchart for determining the target lithium plating window of the target battery may include the following steps:

[0124] S801, based on the correspondence of the target battery at each preset temperature, determines the initial lithium plating window corresponding to the anode potential curve at each preset temperature.

[0125] S802 determines the target lithium plating window based on the initial lithium plating window corresponding to each preset temperature.

[0126] Furthermore, based on the initial lithium plating window corresponding to each preset temperature, the target lithium plating window is determined, including: fitting each preset temperature and the initial lithium plating window at each preset temperature to determine the target lithium plating window.

[0127] In this application embodiment, the specific implementation method is the same as described above. Figure 4 The implementation examples are similar and will not be repeated here.

[0128] In the technical solution of this application embodiment, the target lithium plating window of the target battery at different preset temperatures is obtained by based on the correspondence between multiple preset temperatures under the same charging rate. Since the charging rate corresponding to the target lithium plating window can reflect the charging capacity of the target battery, the accuracy of the charging capacity of the target battery at different preset temperatures determined based on the target lithium plating window at different preset temperatures is improved, and the target lithium plating window can provide a basis for battery design optimization and charging strategy formulation.

[0129] According to some embodiments of this application, refer to Figure 9 , Figure 9 This is a flowchart illustrating another method for determining the initial lithium plating window provided in an embodiment of this application, which may include the following steps:

[0130] S901, determine the difference between the first anode potential curve and the second anode potential curve at each preset temperature.

[0131] S902, based on the difference value corresponding to each preset temperature and the preset difference value, determines the initial lithium plating window corresponding to each preset temperature.

[0132] In this application embodiment, the specific implementation method is the same as described above. Figure 5 The implementation examples are similar and will not be repeated here.

[0133] In the technical solution of this application embodiment, the difference value between the first anode potential curve and the second anode potential curve at each preset temperature is determined, and the initial lithium plating window corresponding to each preset temperature is determined based on the difference value corresponding to each preset temperature and the preset difference value. Since the initial lithium plating window can be determined by the difference value, the method is relatively simple to implement and can improve the efficiency of obtaining the initial lithium plating window.

[0134] According to some embodiments of this application, determining the target lithium plating window based on the initial lithium plating window corresponding to each preset temperature may include: fitting each preset temperature and the initial lithium plating window at each preset temperature to determine the target lithium plating window.

[0135] In some possible implementations, after obtaining the initial lithium plating window at each preset temperature, the target lithium plating window can be obtained by fitting the initial lithium plating window at each preset temperature. For example, fitting methods such as least squares method or analytical expression approximation of discrete data can be used.

[0136] In the technical solution of this application embodiment, the target lithium plating window is determined by fitting the initial lithium plating window at each preset temperature. Since the target lithium plating window is determined by fitting, it is not necessary to obtain the initial lithium plating window at all preset temperatures, thereby simplifying the testing process for the target lithium plating window and improving the testing efficiency.

[0137] It should be understood that although the steps in the flowcharts of the above embodiments are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the above embodiments may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages of other steps.

[0138] Based on the same inventive concept, this application also provides a lithium plating window determining apparatus for implementing the lithium plating window determining method described above. The solution provided by this apparatus is similar to the implementation described in the above method; therefore, the specific limitations in one or more embodiments of the lithium plating window determining apparatus provided below can be found in the limitations of the lithium plating window determining method described above, and will not be repeated here.

[0139] In one embodiment, such as Figure 10 As shown, a lithium plating window determination device is provided, comprising: an acquisition module 11 and a determination module 12, wherein:

[0140] The acquisition module 11 is used to acquire the correspondence between the state of charge and the anode potential of the target battery during the charging process. The target battery includes a first battery and a second battery. The first battery is a lithium-plated battery and the second battery is a non-lithium-plated battery.

[0141] The determination module 12 is used to determine the target lithium plating window of the target battery based on the correspondence.

[0142] In one embodiment, the acquisition module includes:

[0143] The acquisition unit is used to acquire the corresponding relationship of the target battery under the test conditions during the charging process, based on the test conditions.

[0144] In one embodiment, the determining module includes:

[0145] The first determining unit is used to determine the target lithium plating window of the target battery based on the corresponding relationship of the target battery at each charging rate.

[0146] In one embodiment, the first determining unit is further configured to determine the initial lithium plating window corresponding to each charging rate based on the correspondence of the target battery at each charging rate; and to determine the target lithium plating window based on the initial lithium plating window corresponding to each charging rate.

[0147] In one embodiment, the first determining unit is further configured to determine the difference between the first anode potential curve and the second anode potential curve at each charging rate; and to determine the initial lithium plating window corresponding to each charging rate based on the difference value corresponding to each charging rate and the preset difference value.

[0148] In one embodiment, the first determining unit is further configured to fit each charging rate and the initial lithium plating window at each charging rate to determine the target lithium plating window.

[0149] In one embodiment, the determining module further includes:

[0150] The second determining unit is used to determine the target lithium plating window of the target battery based on the corresponding relationship of the target battery at each preset temperature.

[0151] In one embodiment, the second determining unit is further configured to determine the initial lithium plating window corresponding to the anode potential curve at each preset temperature based on the correspondence of the target battery at each preset temperature; and to determine the target lithium plating window based on the initial lithium plating window corresponding to each preset temperature.

[0152] In one embodiment, the second determining unit is further configured to determine the difference between the first anode potential curve and the second anode potential curve at each preset temperature; and to determine the initial lithium plating window corresponding to each preset temperature based on the difference value corresponding to each preset temperature and the preset difference value.

[0153] In one embodiment, the second determining unit is further configured to fit each preset temperature and the initial lithium plating window at each preset temperature to determine the target lithium plating window.

[0154] In one embodiment, the first battery is a battery that has undergone a preset number of charge-discharge cycles at a first charge-discharge rate, and the second battery is a battery that has undergone a preset number of charge-discharge cycles at a second charge-discharge rate; the first charge-discharge rate is greater than the second charge-discharge rate.

[0155] The modules in the aforementioned lithium plating window determination device can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in or independent of the processor in a computer device, or stored in the memory of a computer device as software, so that the processor can call and execute the operations corresponding to each module.

[0156] In one embodiment, a computer device is provided, which may be a terminal, and its internal structure diagram may be as follows: Figure 11 As shown, the computer device includes a processor, memory, communication interface, display screen, and input devices connected via a system bus. The processor provides computing and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system and computer programs. The internal memory provides an environment for the operation of the operating system and computer programs stored in the non-volatile storage media. The communication interface is used for wired or wireless communication with external terminals; wireless communication can be achieved through Wi-Fi, mobile cellular networks, NFC (Near Field Communication), or other technologies. When executed by the processor, the computer program implements a lithium plating window determination method. The display screen can be an LCD screen or an e-ink display screen. The input devices can be a touch layer covering the display screen, buttons, a trackball, or a touchpad mounted on the computer device casing, or an external keyboard, touchpad, or mouse.

[0157] Those skilled in the art will understand that Figure 11 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the computer device to which the present application is applied. Specific computer devices may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0158] In one embodiment, a computer device is provided, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to perform the following steps:

[0159] Obtain the correspondence between the state of charge and anode potential of the target battery during the charging process. The target battery includes a first battery and a second battery. The first battery is a lithium-plated battery, and the second battery is a non-lithium-plated battery.

[0160] Based on the correspondence, the target lithium plating window of the target battery is determined.

[0161] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0162] Based on the test conditions, obtain the corresponding relationship between the target battery and the test conditions during the charging process.

[0163] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0164] Based on the corresponding relationship of the target battery at various charging rates, the target lithium plating window of the target battery is determined.

[0165] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0166] Based on the corresponding relationship of the target battery at each charging rate, determine the initial lithium plating window corresponding to each charging rate;

[0167] The target lithium plating window is determined based on the initial lithium plating window corresponding to each charging rate.

[0168] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0169] Determine the difference between the first anode potential curve and the second anode potential curve at each charging rate;

[0170] The initial lithium plating window for each charging rate is determined based on the difference value and the preset difference value corresponding to each charging rate.

[0171] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0172] The target lithium plating window is determined by fitting the initial lithium plating window at each charging rate.

[0173] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0174] The target lithium plating window of the target battery is determined based on the corresponding relationship of the target battery at various preset temperatures.

[0175] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0176] Based on the corresponding relationship of the target battery at each preset temperature, the initial lithium plating window corresponding to the anode potential curve at each preset temperature is determined;

[0177] The target lithium plating window is determined based on the initial lithium plating window corresponding to each preset temperature.

[0178] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0179] Determine the difference between the first anode potential curve and the second anode potential curve at each preset temperature;

[0180] Based on the difference value corresponding to each preset temperature and the preset difference value, the initial lithium plating window corresponding to each preset temperature is determined.

[0181] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0182] The target lithium plating window is determined by fitting the initial lithium plating window at each preset temperature.

[0183] In one embodiment, the first battery is a battery that has undergone a preset number of charge-discharge cycles at a first charge-discharge rate, and the second battery is a battery that has undergone a preset number of charge-discharge cycles at a second charge-discharge rate; the first charge-discharge rate is greater than the second charge-discharge rate.

[0184] In one embodiment, a computer-readable storage medium is provided having a computer program stored thereon, the computer program performing the following steps when executed by a processor:

[0185] Obtain the correspondence between the state of charge and anode potential of the target battery during the charging process. The target battery includes a first battery and a second battery. The first battery is a lithium-plated battery, and the second battery is a non-lithium-plated battery.

[0186] Based on the correspondence, the target lithium plating window of the target battery is determined.

[0187] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0188] Based on the test conditions, obtain the corresponding relationship between the target battery and the test conditions during the charging process.

[0189] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0190] Based on the corresponding relationship of the target battery at various charging rates, the target lithium plating window of the target battery is determined.

[0191] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0192] Based on the corresponding relationship of the target battery at each charging rate, determine the initial lithium plating window corresponding to each charging rate;

[0193] The target lithium plating window is determined based on the initial lithium plating window corresponding to each charging rate.

[0194] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0195] Determine the difference between the first anode potential curve and the second anode potential curve at each charging rate;

[0196] The initial lithium plating window for each charging rate is determined based on the difference value and the preset difference value corresponding to each charging rate.

[0197] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0198] The target lithium plating window is determined by fitting the initial lithium plating window at each charging rate.

[0199] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0200] The target lithium plating window of the target battery is determined based on the corresponding relationship of the target battery at various preset temperatures.

[0201] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0202] Based on the corresponding relationship of the target battery at each preset temperature, the initial lithium plating window corresponding to the anode potential curve at each preset temperature is determined;

[0203] The target lithium plating window is determined based on the initial lithium plating window corresponding to each preset temperature.

[0204] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0205] Determine the difference between the first anode potential curve and the second anode potential curve at each preset temperature;

[0206] Based on the difference value corresponding to each preset temperature and the preset difference value, the initial lithium plating window corresponding to each preset temperature is determined.

[0207] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0208] The target lithium plating window is determined by fitting the initial lithium plating window at each preset temperature.

[0209] In one embodiment, the first battery is a battery that has undergone a preset number of charge-discharge cycles at a first charge-discharge rate, and the second battery is a battery that has undergone a preset number of charge-discharge cycles at a second charge-discharge rate; the first charge-discharge rate is greater than the second charge-discharge rate.

[0210] In one embodiment, a computer program product is provided, including a computer program that, when executed by a processor, performs the following steps:

[0211] Obtain the correspondence between the state of charge and anode potential of the target battery during the charging process. The target battery includes a first battery and a second battery. The first battery is a lithium-plated battery, and the second battery is a non-lithium-plated battery.

[0212] Based on the correspondence, the target lithium plating window of the target battery is determined.

[0213] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0214] Based on the test conditions, obtain the corresponding relationship between the target battery and the test conditions during the charging process.

[0215] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0216] Based on the corresponding relationship of the target battery at various charging rates, the target lithium plating window of the target battery is determined.

[0217] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0218] Based on the corresponding relationship of the target battery at each charging rate, determine the initial lithium plating window corresponding to each charging rate;

[0219] The target lithium plating window is determined based on the initial lithium plating window corresponding to each charging rate.

[0220] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0221] Determine the difference between the first anode potential curve and the second anode potential curve at each charging rate;

[0222] The initial lithium plating window for each charging rate is determined based on the difference value and the preset difference value corresponding to each charging rate.

[0223] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0224] The target lithium plating window is determined by fitting the initial lithium plating window at each charging rate.

[0225] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0226] The target lithium plating window of the target battery is determined based on the corresponding relationship of the target battery at various preset temperatures.

[0227] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0228] Based on the corresponding relationship of the target battery at each preset temperature, the initial lithium plating window corresponding to the anode potential curve at each preset temperature is determined;

[0229] The target lithium plating window is determined based on the initial lithium plating window corresponding to each preset temperature.

[0230] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0231] Determine the difference between the first anode potential curve and the second anode potential curve at each preset temperature;

[0232] Based on the difference value corresponding to each preset temperature and the preset difference value, the initial lithium plating window corresponding to each preset temperature is determined.

[0233] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0234] The target lithium plating window is determined by fitting the initial lithium plating window at each preset temperature.

[0235] In one embodiment, the first battery is a battery that has undergone a preset number of charge-discharge cycles at a first charge-discharge rate, and the second battery is a battery that has undergone a preset number of charge-discharge cycles at a second charge-discharge rate; the first charge-discharge rate is greater than the second charge-discharge rate.

[0236] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, etc., and are not limited to these.

[0237] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0238] The embodiments described above merely illustrate several implementation methods of this application to facilitate a detailed understanding of the technical solutions of this application, but should not be construed as limiting the scope of protection of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. It should be understood that technical solutions obtained by those skilled in the art based on the technical solutions provided in this application through logical analysis, reasoning, or limited experimentation are all within the scope of protection of the appended claims. Therefore, the scope of protection of this patent application should be determined by the content of the appended claims, and the specification and drawings can be used to interpret the content of the claims.

Claims

1. A method for determining a lithium plating window, characterized in that, The method includes: The correspondence between the state of charge and anode potential of a target battery during the charging process is obtained. The target battery includes a first battery and a second battery. The first battery is a lithium-plated battery, and the second battery is a non-lithium-plated battery. The correspondence includes the first anode potential curve of the first battery and the second anode potential curve of the second battery. The difference between the first anodic potential curve and the second anodic potential curve is determined. Based on the difference and a preset difference, an initial lithium plating window is determined. The initial lithium plating window is fitted to determine the target lithium plating window.

2. The method according to claim 1, characterized in that, The step of determining the difference between the first anolyte potential curve and the second anolyte potential curve, and determining the initial lithium plating window based on the difference and a preset difference, includes: Determine the difference between the first anode potential curve and the second anode potential curve at each charging rate under the same temperature; Based on the difference value corresponding to each charging rate and the preset difference value, the initial lithium plating window corresponding to each charging rate is determined.

3. The method according to claim 2, characterized in that, The process of fitting the initial lithium plating window to determine the target lithium plating window includes: The target lithium plating window is determined by fitting the initial lithium plating window at each of the stated charging rates and the initial lithium plating window at each stated charging rate.

4. The method according to claim 1, characterized in that, The step of determining the difference between the first anolyte potential curve and the second anolyte potential curve, and determining the initial lithium plating window based on the difference and a preset difference, includes: Determine the difference between the first anode potential curve and the second anode potential curve at each preset temperature under the same charging rate; Based on the difference value and the preset difference value corresponding to each preset temperature, the initial lithium plating window corresponding to each preset temperature is determined.

5. The method according to claim 4, characterized in that, The process of fitting the initial lithium plating window to determine the target lithium plating window includes: The target lithium plating window is determined by fitting the preset temperature and the initial lithium plating window at each preset temperature.

6. The method according to any one of claims 1-5, characterized in that, The first battery is a battery that has undergone a preset number of charge-discharge cycles at a first charge-discharge rate, and the second battery is a battery that has undergone the preset number of charge-discharge cycles at a second charge-discharge rate. The first charge / discharge rate is greater than the second charge / discharge rate.

7. A lithium plating window determining device, characterized in that, The device includes: The acquisition module is used to acquire the correspondence between the state of charge and the anode potential of the target battery during the charging process. The target battery includes a first battery and a second battery. The first battery is a lithium-plated battery, and the second battery is a non-lithium-plated battery. The correspondence includes the first anode potential curve of the first battery and the second anode potential curve of the second battery. The determination module is used to determine the difference between the first anode potential curve and the second anode potential curve, determine an initial lithium plating window based on the difference and a preset difference, fit the initial lithium plating window, and determine a target lithium plating window.

8. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 1 to 6.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 6.

10. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 6.

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