Search

CN-121997523-A - Cell simulation method, device, equipment and computer readable storage medium

CN121997523ACN 121997523 ACN121997523 ACN 121997523ACN-121997523-A

Abstract

The application discloses a method, a device, equipment and a computer readable storage medium for simulating a battery cell, wherein the method comprises the steps of obtaining design parameters of a target battery cell; the design parameters comprise first tab parameters, wherein the first tab parameters comprise at least one of tab number, tab configuration representation parameters and tab state representation parameters, and the performance parameters of the target battery cells are obtained through simulation based on the design parameters of the target battery cells. Through the mode, the method and the device can be used for rapidly predicting the performances of the battery cells in different lug forms.

Inventors

  • DING XINDA
  • LI RUI
  • WU XINGYUAN
  • WEI YIMIN

Assignees

  • 宁德时代新能源科技股份有限公司

Dates

Publication Date
20260508
Application Date
20241107

Claims (17)

  1. 1. A method for simulating a cell, the method comprising: the method comprises the steps of obtaining design parameters of a target battery cell, wherein the design parameters comprise first tab parameters, and the first tab parameters comprise at least one of tab number, tab configuration characterization parameters and tab state characterization parameters; and based on the design parameters of the target battery cell, simulating to obtain the performance parameters of the target battery cell.
  2. 2. The method of claim 1, wherein the step of determining the position of the substrate comprises, The tab configuration characterization parameters are used for characterizing whether the tab configuration of the target battery core is a full tab configuration or a half tab configuration; the tab state characterization parameter is used for characterizing whether a target tab of the target battery core is broken or not, and the target tab is preset or determined by a user.
  3. 3. The method of claim 1, wherein the step of determining the position of the substrate comprises, The design parameters further include at least one of a second tab parameter including at least one of a positive tab width, a negative tab width, a tab center distance, and a cell body parameter including at least one of a thickness parameter including at least one of a positive current collector thickness, a negative current collector thickness, an isolation film thickness, a positive thickness, a negative thickness, and a cell material.
  4. 4. The method of claim 1, wherein simulating the performance parameters of the target cell based on the design parameters of the target cell comprises: Obtaining an electrochemical model of the target cell; and solving the electrochemical model based on the design parameters to obtain the performance parameters of the target battery cell.
  5. 5. The method of claim 4, wherein prior to solving the electrochemical model based on the design parameters to obtain the performance parameters of the target cell, the method further comprises: Constructing the geometric configuration of the target battery cell by utilizing the design parameters; and solving the electrochemical model based on the geometric configuration to obtain the performance parameters of the target battery cell.
  6. 6. The method of claim 5, wherein the geometry of the target cell is the geometry of the target cell in the expanded state, and wherein solving the electrochemical model based on the geometry results in the performance parameter of the target cell comprises: dividing the geometric configuration into a plurality of grids; And respectively solving the electrochemical model for each grid to obtain the performance parameters of the target battery cell.
  7. 7. The method of claim 4, wherein the step of determining the position of the first electrode is performed, The electrochemical model comprises a plurality of equations, and the solving process of the electrochemical model comprises the steps of obtaining the boundary condition of the target battery cell and solving the equations based on the boundary condition; Wherein the several equations include at least one of a diffusion equation, a potential equation, and an interface reaction equation, the diffusion equation including at least one of a solid-phase diffusion equation for describing a diffusion process of charge carriers inside the electrode active material particles, and a liquid-phase diffusion equation for describing a diffusion process of charge carriers in the electrolyte, the potential equations include at least one of a solid phase potential equation describing a potential distribution in the electrode active material particles and a liquid phase potential equation describing a potential distribution in the electrolyte, and an interface reaction equation describing a change in current on the electrode with motor potential.
  8. 8. The method of claim 4, wherein the step of determining the position of the first electrode is performed, The boundary condition used in the electrochemical model solving process is related to the first tab parameter; and/or the design parameters further comprise second electrode ear parameters, and boundary conditions used by the electrochemical model in solving are related to the second electrode ear parameters.
  9. 9. The method of claim 4, wherein the step of determining the position of the first electrode is performed, The design parameters also include cell body parameters, the electrochemical model includes a number of equations, and constant terms in at least one of the equations are related to the cell body parameters.
  10. 10. The method of claim 9, wherein the step of determining the position of the substrate comprises, The cell body parameters include a thickness parameter and a cell material, wherein the several equations include a solid phase diffusion equation, a potential equation, and an interface reaction equation, a solid phase diffusion coefficient and a solid phase diffusion particle radius in the solid phase diffusion equation, and an equilibrium potential in the interface reaction equation are related to the cell material, and at least one constant term in the potential equation is related to the thickness parameter.
  11. 11. The method of claim 1, wherein the step of determining the position of the substrate comprises, The performance parameter includes at least one of an amount of lithium intercalation, a battery voltage, an anode potential, a current distribution, a lithium evolution window, a battery capacity of the target cell.
  12. 12. The method of claim 1, wherein the tab configuration characterization parameter is used to characterize a tab configuration of the target cell as a full tab configuration or a half tab configuration, the target cell comprises a first target cell whose tab configuration characterization parameter is characterized as a full tab configuration and a second target cell whose tab configuration characterization parameter is characterized as a half tab configuration, the method further comprising, after obtaining the performance parameters of the first target cell and the performance parameters of the second target cell: Analyzing and obtaining the influence of the full tab configuration and the half tab configuration on the battery cell based on the difference between the performance parameters of the first target battery cell and the second target battery cell; And/or the design parameters further comprise cell main body parameters, wherein the target cell comprises a third target cell and a fourth target cell, and the cell main body parameters respectively corresponding to the third target cell and the fourth target cell are different; analyzing and obtaining the influence of different cell systems on the cells based on the difference between the performance parameters of the third target cell and the performance parameters of the fourth target cell; And/or, the tab state characterization parameter is used for characterizing whether a target tab of the target cell is broken, the target cell comprises a fifth target cell, the tab state characterization parameter corresponding to the fifth target cell is used for characterizing that the target tab is broken, and after the performance parameter of the fifth target cell is obtained, the method further comprises: And analyzing and obtaining the influence of the target tab fracture on the battery cell based on the performance parameters of the fifth target battery cell.
  13. 13. The method of claim 12, wherein the performance parameters include anode potentials at different locations of the target cell, and wherein analyzing the effect of the target tab breakage on the cell based on the performance parameters of the fifth target cell comprises: Determining that the abnormal position of the fifth target battery cell has a lithium precipitation risk after the target tab breaks in response to the abnormal position of the fifth target battery cell, wherein the anode potential of the abnormal position is smaller than the first potential value; and/or, the performance parameter includes anode potentials at different positions of the target battery cell, the influence of the target tab fracture on the battery cell includes that the abnormal position of the fifth target battery cell is at risk of lithium precipitation after the target tab fracture, and the method further includes: Obtaining anode potential difference values of the fifth target battery cell and the sixth target battery cell at the abnormal position, wherein the tab state characterization parameter corresponding to the sixth target battery cell is used for characterizing that the target tab is not broken; and determining that the risk value of the lithium precipitation risk of the abnormal position is larger than a preset risk value in response to the anode potential difference value being larger than a second potential value.
  14. 14. The method of claim 1, wherein the performance parameter of the target cell is a performance parameter of the target cell at different times in a preset operating state, the method further comprising: and displaying the performance parameters of the target battery cell at different moments in a preset working state.
  15. 15. A cell simulation device, the device comprising: the device comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring design parameters of a target battery cell, the design parameters comprise first tab parameters, and the first tab parameters comprise at least one of tab number, tab configuration representation parameters and tab state representation parameters; And the simulation module is used for obtaining the performance parameters of the target battery cell in a simulation mode based on the design parameters of the target battery cell.
  16. 16. A cell simulation device, characterized in that it comprises a memory storing program instructions and a processor for executing the program instructions to implement the cell simulation method according to any of claims 1 to 14.
  17. 17. A computer readable storage medium, characterized in that the computer readable storage medium is for storing program instructions, the program instructions are capable of being executed to implement the cell simulation method of any one of claims 1 to 14.

Description

Cell simulation method, device, equipment and computer readable storage medium Technical Field The present application relates to the field of battery technologies, and in particular, to a method, an apparatus, a device, and a computer readable storage medium for simulating a battery cell. Background The tab, which is an electron carrier in the wound cell, is very important. In engineering application, due to factors such as a battery cell structure and tab strength, the layouts of single-pole tabs, full-pole tabs, half-pole tabs, broken pole tabs and the like are generally available. Different tab layouts can have an impact on the performance of the cell. Currently, in order to explore the influence of different lug layouts on the performance of the battery cells, the battery cells need to be actually produced and developed, which leads to increased cost and low exploration efficiency. Disclosure of Invention The application provides at least a cell simulation method, a device, equipment and a computer readable storage medium. The first aspect of the application provides a battery cell simulation method, which comprises the steps of obtaining design parameters of a target battery cell, wherein the design parameters comprise first tab parameters, the first tab parameters comprise at least one of tab number, tab configuration representation parameters and tab state representation parameters, and simulating to obtain performance parameters of the target battery cell based on the design parameters of the target battery cell. Therefore, the obtained first tab parameter related to the target battery cell is based on the first tab parameter of the target battery cell, so that the performance parameter of the target battery cell in the tab form corresponding to the first tab parameter can be obtained through simulation, and the performance of the target battery cell in the tab form corresponding to the first tab parameter can be rapidly predicted. Further, by acquiring different first tab parameters of the target battery cell, performance parameters of the target battery cell in different tab forms can be obtained through simulation, the performance of the target battery cell in different tab forms can be rapidly predicted, theoretical guidance is provided for the tab design of the battery cell, actual production and research and development of the battery cell are not needed, and cost is reduced. The tab configuration characterization parameters are used for characterizing whether the tab configuration of the target battery core is a full tab configuration or a half tab configuration, and the tab state characterization parameters are used for characterizing whether the target tab of the target battery core is broken or not, wherein the target tab is preset or determined by a user. Therefore, under the condition that the tab configuration of the tab configuration characterization parameter characterization target battery cell is the full tab configuration or the half tab configuration, the performance parameter of the target battery cell of the full tab configuration or the half tab configuration can be obtained in a subsequent simulation mode, and the performance of the target battery cell of the full tab configuration or the half tab configuration can be rapidly predicted. Under the condition that the tab state characterization parameter characterizes the target tab of the target battery core to be broken, the performance parameter of the target battery core with the broken target tab can be obtained through subsequent simulation, the performance of the target battery core with the broken target tab can be rapidly predicted, and further, the influence of the broken target tab (such as whether the lithium precipitation phenomenon is caused after the target tab is broken) can be estimated based on the performance parameter of the target battery core with the broken target tab. The design parameters further comprise at least one of second tab parameters and cell main body parameters, wherein the second tab parameters comprise at least one of positive electrode tab width, negative electrode tab width and tab center distance, the cell main body parameters comprise at least one of thickness parameters and cell materials, and the thickness parameters comprise at least one of positive electrode current collector thickness, negative electrode current collector thickness, isolation film thickness, positive electrode thickness and negative electrode thickness. Therefore, since the second tab parameter and the main battery cell parameter related to the target battery cell are also obtained, the tab form corresponding to the first tab parameter and the second tab parameter and the performance parameter of the target battery cell of the main battery cell structure corresponding to the main battery cell parameter can be obtained through simulation based on the second tab parameter and the main battery cell parameter of the tar