A lithium battery SEI film change simulation method, system and storage medium

Abstract

The application discloses a lithium battery SEI film change simulation method and system and a storage medium. The method comprises the following steps: inputting battery physical and chemical parameters and actual working condition data into a thermal coupling electrochemical model to generate a parameter identification result of the thermal coupling electrochemical model; calculating SEI film overpotential according to the parameter identification result of the thermal coupling electrochemical model; calculating SEI film lithium precipitation amount according to the SEI film overpotential and a preset BV equation of lithium precipitation side reaction; and respectively calculating SEI film thickness change parameters and SEI film impedance change parameters according to the SEI film lithium precipitation amount. The application can effectively improve the accuracy of predicting the SEI film change of the lithium battery.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electrochemical modeling, and particularly relates to a lithium battery SEI film change simulation method, a system and a storage medium. BACKGROUND

[0002] As a conventional secondary battery, the lithium ion battery has high energy density and cycle life, and is currently widely used in mobile communication, digital technology, electric vehicles, energy storage and other fields. At present, the demand for lithium ion batteries and their materials is gradually increasing, and the supporting upstream and downstream industrial chains also have good development prospects.

[0003] During the first charge and discharge process of the liquid lithium ion battery, the electrode material and the electrolyte react on the solid-liquid interface to form a passivation layer covering the surface of the electrode material. This passivation layer is an interface layer with the characteristics of a solid electrolyte, which is an electronic insulator but a good conductor of Li+, and Li+ can freely insert and extract through the passivation layer. Therefore, this passivation film is called a "solid electrolyte interface" (SEI film) for short.

[0004] The formation of the SEI film has a crucial impact on the performance of the electrode material. On the one hand, the formation of the SEI film consumes part of the lithium ions, increasing the first charge and discharge irreversibility and reducing the charge and discharge efficiency of the electrode material. On the other hand, the SEI film is insoluble in organic solvents and can exist stably in an organic electrolyte solution, and solvent molecules cannot pass through the passivation layer, thereby effectively preventing the co-insertion of solvent molecules and avoiding damage to the electrode material caused by the co-insertion of solvent molecules, greatly improving the cycle performance and service life of the electrode. In-depth research on the formation mechanism, composition structure, stability and influencing factors of the SEI film and further search for effective ways to improve the performance of the SEI film have always been a hot spot in the field of electrochemistry.

[0005] Therefore, there is a need for a lithium battery SEI film change simulation method to improve the accuracy of predicting the SEI film change of the lithium battery. SUMMARY

[0006] To solve the technical problem that the SEI film change in the electrochemical reaction process of the lithium battery cannot be accurately predicted, the present application provides a lithium battery SEI film change simulation method, a system and a storage medium, and the specific technical solutions are as follows:

[0007] The present application provides a lithium battery SEI film change simulation method, comprising the steps of:

[0008] inputting the battery physicochemical parameters and actual working condition data into the thermal coupling electrochemical model to generate a parameter identification result of the thermal coupling electrochemical model;

[0009] calculating SEI film overpotential according to the parameter identification result of the thermal coupling electrochemical model;

[0010] calculating SEI film lithium precipitation amount according to the SEI film overpotential and a preset BV equation of lithium precipitation side reaction;

[0011] calculating SEI film thickness change parameter and SEI film impedance change parameter respectively according to the SEI film lithium precipitation amount.

[0012] The lithium battery SEI film change simulation method provided by the application discloses a technical scheme of calculating SEI film lithium precipitation amount according to the parameter identification result of a thermal coupling model and a preset BV equation of lithium precipitation side reaction, and further estimating SEI film impedance change parameter, thereby improving the accuracy of predicting the change of lithium battery SEI film.

[0013] In some embodiments, the SEI film overpotential is calculated according to the parameter identification result of the thermal coupling electrochemical model, specifically including:

[0014] The SEI film overpotential is calculated according to the solid phase potential, the liquid phase potential, the lithium precipitation reaction equilibrium potential, the specific surface area, the solid-liquid phase exchange current density and the SEI film impedance in the parameter identification result of the thermal coupling electrochemical model, and the formula is as follows:

[0015] η sei =Φ s -Φ e -E sei -αFj n R;

[0016] Wherein, η sei is the SEI film overpotential, Φ s is the solid phase potential, Φ e is the liquid phase potential, E sei is the lithium precipitation reaction equilibrium potential, α is the specific surface area, j n is the solid-liquid phase exchange current density, and R is the SEI film impedance.

[0017] In some embodiments, the lithium precipitation reaction equilibrium potential is corrected based on temperature when the SEI film overpotential is calculated, and the formula is as follows:

[0018]

[0019] Wherein, E ref is the lithium precipitation reaction equilibrium potential at a reference temperature T ref , and E is the lithium precipitation reaction equilibrium potential at temperature T.

[0020] In some embodiments, the SEI film lithium precipitation amount is calculated according to the SEI film overpotential and the BV equation of the preset lithium precipitation side reaction, specifically comprising:

[0021] The BV equation of the preset lithium precipitation side reaction is modified according to the preset single cell difference parameter and the preset lithium precipitation irreversibility parameter;

[0022] The SEI film lithium precipitation amount is calculated according to the SEI film overpotential and the modified BV equation of the lithium precipitation side reaction, and the formula is as follows:

[0023]

[0024]

[0025] Wherein, i0 is a reference exchange current density, γ is the single cell difference parameter for characterizing individual differences between single cells due to process, batch, etc., β is the lithium precipitation irreversibility parameter for characterizing lithium precipitation irreversibility, k is a reference reaction coefficient, C ref is a reference concentration, C e is a liquid phase concentration.

[0026] In some embodiments, after the SEI film lithium precipitation amount is calculated to obtain the SEI film thickness change parameter and the SEI film impedance change parameter, the method further comprises:

[0027] According to the detected actual SEI film impedance change parameter and the calculated generated simulated SEI film impedance change parameter, the single cell difference parameter and the lithium precipitation irreversibility parameter are adjusted.

[0028] In some embodiments, the SEI film lithium precipitation amount is calculated to obtain the SEI film thickness change parameter and the SEI film impedance change parameter, specifically comprising:

[0029] The formula for calculating the SEI film thickness change parameter and the SEI film impedance change parameter is as follows:

[0030]

[0031] Wherein, r is the total radius of active particles plus SEI film, r0 is the radius of active particles, M sei is the average molecular molar mass of SEI film, ρ sei is the average radius of SEI film.

[0032] In some embodiments, after the SEI film lithium precipitation amount is calculated to obtain the SEI film thickness change parameter and the SEI film impedance change parameter, the method further comprises:

[0033] The SEI film impedance change variable is coupled with the parameter identification result.

[0034] Simulated working condition data is generated according to the parameter identification result after coupling and the thermal coupling electrochemical model, and battery capacity life is predicted according to the simulated working condition data.

[0035] In some embodiments, according to another aspect of the present application, the present application also provides a lithium battery SEI film change simulation system, comprising:

[0036] An identification module is configured to input battery physical and chemical parameters and actual working condition data into a thermal coupling electrochemical model to generate a parameter identification result of the thermal coupling electrochemical model.

[0037] A first calculation module is connected to the identification module and is configured to calculate SEI film overpotential according to the parameter identification result of the thermal coupling electrochemical model.

[0038] A second calculation module is connected to the first calculation module and is configured to calculate SEI film lithium precipitation amount according to the SEI film overpotential and a preset BV equation of lithium precipitation side reaction.

[0039] A third calculation module is connected to the second calculation module and is configured to calculate SEI film thickness change variable and SEI film impedance change variable according to the SEI film lithium precipitation amount, respectively.

[0040] In some embodiments, according to another aspect of the present application, the present application also provides a storage medium having at least one instruction stored therein, which is loaded and executed by a processor to implement the operations performed by the above-mentioned lithium battery SEI film change simulation method.

[0041] A lithium battery SEI film change simulation device, characterized by comprising a processor, a memory, and a computer program stored in the memory and executable on the processor, wherein the processor is configured to execute the computer program stored in the memory to implement the operations performed by the above-mentioned lithium battery SEI film change simulation method.

[0042] The present application provides a lithium battery SEI film change simulation method, system and storage medium, which comprises the following technical effects:

[0043] The present application discloses a technical solution for calculating SEI film lithium precipitation amount according to the parameter identification result of the thermal coupling model and the preset BV equation of lithium precipitation side reaction, and further estimating SEI film impedance change variable, thereby improving the accuracy of predicting the change of lithium battery SEI film. BRIEF DESCRIPTION OF DRAWINGS

[0044] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiments description. Obviously, the drawings in the following description only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0045] Figure 1 Flow chart of the lithium battery SEI film change simulation method of the present application;

[0046] Figure 2 Flow chart of the SEI film overpotential calculation in the lithium battery SEI film change simulation method of the present application;

[0047] Figure 3 Flow chart of the SEI film lithium extraction amount calculation in the lithium battery SEI film change simulation method of the present application;

[0048] Figure 4 Flow chart of the single cell difference parameter and lithium extraction irreversible parameter adjustment in the lithium battery SEI film change simulation method of the present application;

[0049] Figure 5 Flow chart of the battery capacity life prediction in the lithium battery SEI film change simulation method of the present application;

[0050] Figure 6 Example diagram of the lithium battery SEI film change simulation system of the present application.

[0051] Figure label: identification module-10, first calculation module-20, third calculation module-30 and third calculation module-40. DETAILED DESCRIPTION

[0052] In the following description, for the purpose of explanation and not limitation, specific details are set forth, such as specific system structures, techniques, etc., in order to thoroughly disclose the embodiments of the present application. However, it should be clear to those skilled in the art that the present application can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits and methods are omitted so as not to obscure the description of the present application with unnecessary details.

[0053] It should be understood that when used in the specification and the appended claims, the term "comprising" indicates the presence of the described features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0054] For the purpose of simplicity and brevity of the drawings, only the parts related to the present application are shown in the drawings, which do not represent the actual structure of the product. In addition, for the purpose of simplicity and brevity of the drawings, in some drawings, only one of the parts with the same structure or function is shown schematically, or only one of them is marked. In this document, "one" not only means "only one", but also means "more than one" in some cases.

[0055] It should be further understood that the term "and / or" used in the present application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes these combinations.

[0056] In addition, in the description of the present application, the terms "first", "second", etc. are only used for differentiation and description, and cannot be understood as indicating or implying relative importance.

[0057] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, specific embodiments of the present application will be described below with reference to the drawings. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained from these drawings without creative labor, and other embodiments can also be obtained.

[0058] One embodiment of the present application, as shown in Figure 1 The present application provides a lithium battery SEI film change simulation method, comprising the steps of:

[0059] S100 inputting the battery physical and chemical parameters and actual working condition data into the thermal coupling electrochemical model to generate the parameter identification result of the thermal coupling electrochemical model.

[0060] Specifically, since the decomposition and regrowth of the SEI film has strong correlation with the reaction temperature, the thermal coupling electrochemical model needs to be selected in the process of constructing the electrochemical model.

[0061] S200 calculating the SEI film overpotential according to the parameter identification result of the thermal coupling electrochemical model.

[0062] S300 calculating the SEI film lithium precipitation amount according to the SEI film overpotential and the preset BV equation of the lithium precipitation side reaction.

[0063] S400 calculating the SEI film thickness change parameter and the SEI film impedance change parameter according to the SEI film lithium precipitation amount, respectively.

[0064] The lithium battery SEI film change simulation method provided by the embodiment discloses a technical scheme of calculating the SEI film lithium precipitation amount according to the parameter identification result of the thermal coupling model and the BV equation of the preset lithium precipitation side reaction, and further estimating the SEI film impedance change parameter, so as to improve the accuracy of predicting the SEI film change of the lithium battery.

[0065] In one embodiment, as shown in Figure 2 Step S200 calculates the SEI film overpotential according to the parameter identification result of the thermal coupling electrochemical model, specifically including:

[0066] S210 calculates the SEI film overpotential according to the solid phase potential, the liquid phase potential, the lithium precipitation reaction equilibrium potential, the specific surface area, the solid-liquid phase exchange current density and the SEI film impedance in the parameter identification result of the thermal coupling electrochemical model, and the formula is as follows:

[0067] η sei =Φ s -Φ e -E sei -αFj n R;

[0068] Wherein, η sei is the SEI film overpotential, Φ s is the solid phase potential, Φ e is the liquid phase potential, E sei is the lithium precipitation reaction equilibrium potential, α is the specific surface area, j n is the solid-liquid phase exchange current density, and R is the SEI film impedance.

[0069] In one embodiment, during the execution of step S210 to calculate the SEI film overpotential, the lithium precipitation reaction equilibrium potential can be corrected based on the temperature, and the formula is as follows:

[0070]

[0071] Wherein, E ref is the lithium precipitation reaction equilibrium potential at the reference temperature T ref , and E is the lithium precipitation reaction equilibrium potential at the temperature T.

[0072] Exemplarily, the lithium precipitation reaction equilibrium potential can also be corrected according to the Arrhenius formula after correcting the temperature E, and then corrected according to the corrected temperature E.

[0073] In one embodiment, as shown in Figure 3 Step S300 calculates the SEI film lithium precipitation amount according to the SEI film overpotential and the BV equation of the preset lithium precipitation side reaction, specifically including:

[0074] S310 corrects the BV equation of the preset lithium precipitation side reaction according to the preset single battery difference parameter and the preset lithium precipitation irreversible parameter.

[0075] S320 calculates the SEI film lithium extraction amount according to the SEI film overpotential and the BV equation of the corrected lithium extraction side reaction, and the formula is as follows:

[0076]

[0077]

[0078] Wherein, i0 is the reference exchange current density, γ is the single cell difference parameter for characterizing the individual difference between single cells due to process, batch, etc., β is the lithium extraction irreversibility parameter for characterizing the lithium extraction irreversibility, k is the reference reaction coefficient, C ref is the reference concentration, C e is the liquid phase concentration.

[0079] In one embodiment, as shown in Figure 4 , after step S400 calculates the SEI film thickness change parameter and the SEI film impedance change parameter according to the SEI film lithium extraction amount, it further includes:

[0080] S500 adjusts the single cell difference parameter and the lithium extraction irreversibility parameter according to the detected actual SEI film impedance change parameter and the calculated generated simulation SEI film impedance change parameter.

[0081] Specifically, the single cell difference parameter and the lithium extraction irreversibility parameter are taken as posterior parameters, and the preset single cell difference parameter and the preset lithium extraction irreversibility parameter are corrected according to the comparison between the actual SEI film impedance change parameter and the calculated generated simulation SEI film impedance change parameter.

[0082] In one embodiment, step S400 calculates the SEI film thickness change parameter and the SEI film impedance change parameter according to the SEI film lithium extraction amount, specifically including:

[0083] S410 calculates the SEI film thickness change parameter and the SEI film impedance change parameter, and the formula is as follows:

[0084]

[0085] Wherein, r is the total radius of the active particle plus the SEI film, r0 is the active particle radius, M sei is the average molecular molar mass of the SEI film, ρ sei is the average radius of the SEI film.

[0086] In one embodiment, as shown in Figure 5 , after step S400 calculates the SEI film thickness change parameter and the SEI film impedance change parameter according to the SEI film lithium extraction amount, it further includes:

[0087] S600 couples the SEI film impedance change variable with the parameter identification result.

[0088] S700 generates simulation working condition data according to the coupled parameter identification result and the thermal coupling electrochemical model, and predicts the battery capacity life according to the simulation working condition data.

[0089] In one embodiment, as shown in Figure 6 According to another aspect of the present application, the present application also provides a lithium battery SEI film change simulation system, comprising an identification module 10, a first calculation module 20, a third calculation module 30 and a third calculation module 40.

[0090] The identification module 10 is used to input the battery physical and chemical parameters and the actual working condition data into the thermal coupling electrochemical model, and generate the parameter identification result of the thermal coupling electrochemical model.

[0091] The first calculation module 20 is connected with the identification module 10, and is used to calculate the SEI film overpotential according to the parameter identification result of the thermal coupling electrochemical model.

[0092] The second calculation module 30 is connected with the first calculation module 20, and is used to calculate the SEI film lithium precipitation amount according to the SEI film overpotential and the preset BV equation of lithium precipitation side reaction.

[0093] The third calculation module 40 is connected with the second calculation module 30, and is used to calculate the SEI film thickness change variable and the SEI film impedance change variable according to the SEI film lithium precipitation amount, respectively.

[0094] The lithium battery SEI film change simulation system provided in the embodiment discloses a technical scheme of calculating the SEI film lithium precipitation amount according to the parameter identification result of the thermal coupling model, combining the preset BV equation of lithium precipitation side reaction, and further estimating the SEI film impedance change variable, thereby improving the accuracy of predicting the SEI film change of the lithium battery.

[0095] In one embodiment, according to another aspect of the present application, the present application also provides a storage medium, wherein at least one instruction is stored in the storage medium, and the instruction is loaded and executed by a processor to implement the operations performed by any one of the above lithium battery SEI film change simulation methods.

[0096] In one embodiment, according to another aspect of the present application, the present application also provides a lithium battery SEI film change simulation device, comprising a processor, a memory and a computer program stored in the memory and executable on the processor, wherein the processor is used to execute the computer program stored in the memory to implement the operations performed by any one of the above lithium battery SEI film change simulation methods.

[0097] In the above embodiments, the description of each embodiment focuses on different aspects, and the parts not described or recorded in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0098] Those skilled in the art can appreciate that the units and steps of the examples described in combination with the embodiments disclosed herein can be implemented by electronic hardware or a combination of computer software and electronic hardware. Whether the functions are implemented in hardware or software depends on the specific application and design constraints of the technical solutions. A person skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0099] In the embodiments provided in the present application, it should be understood that the disclosed lithium battery SEI film change simulation method, system and storage medium can be implemented by other ways. For example, the lithium battery SEI film change simulation method, system and storage medium embodiments described above are only illustrative. For example, the division of the modules or units is only a logical function division, and actual implementation can have another division manner. For example, a plurality of units or modules can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the communication connection between the displayed or discussed units can be through some interface, device or unit communication connection or integrated circuit, which can be electrical, mechanical or other forms.

[0100] The units described as separate components can or can not be physically separated, and the components shown as units can or can not be physical units, that is, they can be located in one place or distributed on a plurality of network units. Part or all of the units can be selected to achieve the purpose of the embodiments according to actual needs.

[0101] In addition, each functional unit in each embodiment of the present application can be integrated in one processing unit, or each unit can exist physically, or two or more units can be integrated in one unit. The integrated unit can be realized in the form of hardware or software functional unit.

[0102] It should be noted that the above only describes the preferred embodiments of the present application. It should be noted that for those skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, and these improvements and refinements should be considered within the scope of the present application.

Claims

1. A method for simulating changes in the SEI film of a lithium battery, characterized in that, The method comprises the steps of: inputting battery physical parameters and actual working condition data into a thermal coupling electrochemical model to generate a parameter identification result of the thermal coupling electrochemical model; calculating SEI film overpotential according to the parameter identification result of the thermal coupling electrochemical model; calculating SEI film lithium precipitation amount according to the SEI film overpotential and a preset BV equation of lithium precipitation side reaction; calculating SEI film thickness change parameter and SEI film impedance change parameter according to the SEI film lithium precipitation amount, respectively; wherein the calculation of the SEI film lithium precipitation amount according to the SEI film overpotential and the preset BV equation of lithium precipitation side reaction specifically comprises: modifying the preset BV equation of lithium precipitation side reaction according to a preset single battery difference parameter and a preset lithium precipitation irreversible parameter; calculating the SEI film lithium precipitation amount according to the SEI film overpotential and the modified BV equation of lithium precipitation side reaction, as shown in the following formula: ； ； wherein, is a reference exchange current density, γ is the single cell difference parameter for characterizing individual differences between single cells due to process, batch reasons, is the lithium precipitation irreversibility parameter for characterizing lithium precipitation irreversibility, k is a reference reaction coefficient, C ref is a reference concentration, C e is a liquid phase concentration, α a is a dimensionless concentration dependency exponent.

2. The method of claim 1, wherein the SEI film change of the lithium battery is simulated. The calculation of the SEI film overpotential according to the parameter identification result of the thermal coupling electrochemical model specifically comprises: calculating the SEI film overpotential according to solid phase potential, liquid phase potential, lithium precipitation reaction equilibrium potential, specific surface area, solid-liquid phase exchange current density and SEI film impedance in the parameter identification result of the thermal coupling electrochemical model, as shown in the following formula: ； wherein, is the overpotential for the SEI film, is the solid phase potential, is the liquid phase potential, is the equilibrium potential for the lithium extraction reaction, is the specific surface area, is the solid-liquid phase exchange current density, and R is the SEI film impedance.

3. The method according to claim 2, wherein the lithium battery SEI film change simulation method is characterized in that: the lithium precipitation reaction equilibrium potential is modified based on temperature when the SEI film overpotential is calculated, as shown in the following formula: ； where E ref is the equilibrium potential of the lithium precipitation reaction at a reference temperature T ref is the equilibrium potential of the lithium precipitation reaction at a temperature T.

4. The method of claim 1, wherein the SEI film change of the lithium battery is simulated. After the calculation of the SEI film thickness change parameter and the SEI film impedance change parameter according to the SEI film lithium precipitation amount, the method further comprises: adjusting the single battery difference parameter and the lithium precipitation irreversible parameter according to the actual SEI film impedance change parameter and the simulated SEI film impedance change parameter.

5. The method of claim 1, wherein the method is a method of simulating a change in SEI film of a lithium battery. The calculation of the SEI film thickness change parameter and the SEI film impedance change parameter according to the SEI film lithium precipitation amount specifically comprises: the formula for calculating the SEI film thickness change parameter and the SEI film impedance change parameter is as shown in the following formula: ； where r is the total radius of the active particle plus the SEI film, is the active particle radius, is the average molecular molar mass of the SEI film, is the SEI film average radius, and σ represents the effective conductivity of the SEI film.

6. The method of claim 1-5, wherein, After the calculation of the SEI film thickness change parameter and the SEI film impedance change parameter according to the SEI film lithium precipitation amount, the method further comprises: coupling the SEI film impedance change parameter with the parameter identification result; generating simulated working condition data according to the coupled parameter identification result and the thermal coupling electrochemical model, and predicting battery capacity life according to the simulated working condition data.

7. A lithium battery SEI film change simulation system, characterized by, The method comprises: an identification module for inputting battery physical parameters and actual working condition data into a thermal coupling electrochemical model to generate a parameter identification result of the thermal coupling electrochemical model; a first calculation module connected with the identification module for calculating SEI film overpotential according to the parameter identification result of the thermal coupling electrochemical model; a second calculation module connected with the first calculation module for calculating SEI film lithium precipitation amount according to the SEI film overpotential and a preset BV equation of lithium precipitation side reaction; a third calculation module connected with the second calculation module for calculating SEI film thickness change parameter and SEI film impedance change parameter according to the SEI film lithium precipitation amount, respectively; The SEI film lithium precipitation amount is calculated according to the SEI film overpotential and the BV equation of the preset lithium precipitation side reaction, and specifically includes the following steps. The BV equation of the lithium precipitation side reaction is corrected according to the preset single battery difference parameter and the preset lithium precipitation irreversible parameter. The SEI film lithium precipitation amount is calculated according to the SEI film overpotential and the BV equation of the corrected lithium precipitation side reaction, and the formula is as follows: ； ； wherein, is the reference exchange current density, γ is the single cell difference parameter for characterizing individual differences between single cells due to process, batch reasons, is the lithium precipitation irreversibility parameter for characterizing lithium precipitation irreversibility, k is a reference reaction coefficient, C ref is the reference concentration, C e is the liquid phase concentration, a a is the dimensionless concentration dependency exponent.

8. A storage medium, characterized by The storage medium stores at least one instruction, which is loaded and executed by the processor to implement the operation of the lithium battery SEI film change simulation method according to any one of claims 1-6.

9. A lithium battery SEI film change simulation device, characterized by, The computer program stored in the memory and executable on the processor, the processor is used for executing the computer program stored on the memory, realizing the operation of the lithium battery SEI film change simulation method according to any one of claims 1-6.

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