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CN-122017591-A - Method, device, storage medium, electronic device, and program product for calculating battery expansion force

CN122017591ACN 122017591 ACN122017591 ACN 122017591ACN-122017591-A

Abstract

The application discloses a calculation method, a device, a storage medium, an electronic device and a program product of battery expansion force, which relate to the technical field of battery expansion force prediction and comprise the steps of determining historical working condition parameters when a battery runs, wherein the historical working condition parameters at least comprise historical thickness parameters, historical gas production and historical battery expansion force; and calculating the current thickness parameter and the current gas production by using the battery expansion force calculation model to obtain a target battery expansion force, thereby solving the technical problem of how to improve the measurement accuracy of the battery expansion force and improving the measurement accuracy of the battery expansion force.

Inventors

  • GAO PO
  • MA RUIJUN

Assignees

  • 中创新航科技集团股份有限公司

Dates

Publication Date
20260512
Application Date
20260210

Claims (14)

  1. 1. A method for calculating battery expansion force, comprising at least: determining historical working condition parameters of the battery during operation, wherein the historical working condition parameters at least comprise historical thickness parameters, historical gas production and historical battery expansion force; Constructing a battery expansion force calculation model according to the corresponding relation among the historical thickness parameter, the historical gas production and the historical battery expansion force; And calculating the current thickness parameter and the current gas production by using the battery expansion force calculation model to obtain the target battery expansion force.
  2. 2. The method of calculating a battery expansion force according to claim 1, wherein constructing a battery expansion force calculation model from a correspondence relationship among the historical thickness parameter, the historical gas production amount, and the historical battery expansion force comprises: determining a first function corresponding to the historical thickness parameter and determining a second function corresponding to the historical gas production, wherein the first function is used for representing a first corresponding relation between the historical thickness parameter and the historical battery expansion force, and the second function is used for representing a second corresponding relation between the historical gas production and the historical battery expansion force; and obtaining the battery expansion force calculation model by using the first function and the second function.
  3. 3. The method for calculating a battery expansion force according to claim 2, wherein the historical operating condition parameters further include a battery initial pre-tightening force, the battery expansion force calculation model is obtained by using the first function and the second function, and the method comprises the steps of: determining a function constant term corresponding to the initial pretightening force of the battery; and obtaining the battery expansion force calculation model based on the first function, the second function and the function constant term.
  4. 4. A method of calculating battery expansion force according to claim 3, wherein the first function is f (1) =k1×thk, the second function is f (2) =k2×gas, k1 is a constant, k2 is a constant, THK represents the historical thickness parameter, and Gas is the historical Gas production.
  5. 5. The method of claim 1, wherein the current thickness parameter comprises at least a current stored hardness, and wherein prior to calculating the current thickness parameter and the current gas production using the battery expansion force calculation model to obtain the target battery expansion force, the method further comprises: acquiring first operation data for calculating the current storage hardness from the current operation data of the battery; And calculating the first operation data by using a first calculation formula to obtain the current storage hardness.
  6. 6. The method according to claim 5, wherein the first calculation formula is THKs =a×k3exp (SOC) ×exp (-k 4/(273.15+t)) ×t+b1, THKs represents the current storage hardness, a is a constant, k3 is an SOC coefficient, SOC is a current state of charge, k4 is a temperature coefficient, T is a temperature, T is a storage time, and b1 is a constant.
  7. 7. The method of claim 5 or 6, wherein the current thickness parameter further comprises a current cyclic hardness, and wherein prior to calculating the current thickness parameter and the current gas production using the battery expansion force calculation model to obtain the target battery expansion force, the method further comprises: acquiring second operation data for calculating the cyclic hardness from the current operation data of the battery; Calculating the second operation data by using a second calculation formula to obtain the current cycle hardness; The current thickness parameter is determined based on the current stored hardness and the current cycle hardness.
  8. 8. The method according to claim 7, wherein the second calculation formula is THKc =B×k5exp (DOD) ×k6exp (Drate) ×exp (-k 7/(273.15+T))×N+b2, THKc is the current cycle hardness, B is a constant, DOD is a depth of discharge, drate is a discharge rate, k5 is a DOD coefficient, k6 is a discharge rate coefficient, k7 is a temperature coefficient, T is a temperature, N is a number of cycles, and B2 is a constant.
  9. 9. The method of calculating a battery expansion force according to claim 1, wherein before calculating a current thickness parameter and a current gas production amount using the battery expansion force calculation model, the method further comprises: acquiring third operation data for calculating gas production parameters from the current operation data of the battery, wherein the gas production parameters comprise gas production; and calculating the third operation data by using a third calculation formula corresponding to the gas production amount to obtain the current gas production amount.
  10. 10. The method for calculating a battery expansion force according to claim 1, wherein calculating the current thickness parameter and the current gas production amount using the battery expansion force calculation model to obtain a target battery expansion force comprises: Determining an objective function corresponding to the battery expansion force calculation model, wherein the objective function at least comprises a first function corresponding to the historical thickness parameter, a second function corresponding to the historical gas production amount and a function constant term corresponding to the battery initial pretightening force; Calculating the current thickness parameter by using the first function to obtain a first battery expansion force; calculating the current gas production by using the second function to obtain a second battery expansion force; And obtaining the target battery expansion force based on the sum of the first battery expansion force, the second battery expansion force and the initial battery pre-tightening force.
  11. 11. A battery expansion force calculation device, comprising: The determining module is used for determining historical working condition parameters when the battery runs, wherein the historical working condition parameters at least comprise historical thickness parameters, historical gas production and historical battery expansion force; the construction module is used for constructing a battery expansion force calculation model according to the corresponding relation among the historical thickness parameter, the historical gas production and the historical battery expansion force; and the obtaining module is used for calculating the current thickness parameter and the current gas production by using the battery expansion force calculation model to obtain the target battery expansion force.
  12. 12. A computer-readable storage medium, characterized in that the computer-readable storage medium comprises a stored program, wherein the program when run performs the method of any one of claims 1 to 10.
  13. 13. An electronic device comprising a memory and a processor, characterized in that the memory has stored therein a computer program, the processor being arranged to execute the method according to any of claims 1 to 10 by means of the computer program.
  14. 14. A computer program product comprising a computer program, characterized in that the computer program, when being executed by a processor, implements the steps of the method as claimed in any one of claims 1 to 10.

Description

Method, device, storage medium, electronic device, and program product for calculating battery expansion force Technical Field The present application relates to the field of battery expansion force prediction, and in particular, to a method, an apparatus, a storage medium, an electronic apparatus, and a program product for calculating a battery expansion force. Background In the development history of lithium battery technology, monitoring and controlling the expansion force have been key factors for ensuring the safety of batteries and prolonging the service life. Currently, direct physical measurement methods are mostly adopted for measuring the expansion force, for example, a precise strain gauge is attached on a battery shell to capture micro deformation, a piezoresistive flexible sensor is embedded into the battery to sense pressure change, or advanced optical/digital imaging technology is adopted to observe dynamic change of the battery size. However, the physical measurement method has a longer test period, the measurement accuracy is limited by severe test conditions, and slight environmental fluctuation (such as temperature and humidity) can cause data deviation, so that the stability and reliability of expansion force evaluation are seriously affected. Under the working conditions of extreme temperature, high-load circulation and the like, the physical measurement means is difficult to accurately capture the expansion force under the dynamic changes in real time, and potential safety risks such as diaphragm breakage, internal short circuit and the like cannot be pre-warned. Accordingly, in the related art, there is a technical problem of how to improve the measurement accuracy of the battery expansion force. Aiming at the technical problem of how to improve the measurement accuracy of the battery expansion force in the related art, no effective solution has been proposed. Disclosure of Invention The embodiment of the application provides a method, a device, a storage medium, an electronic device and a program product for calculating battery expansion force, which are used for at least solving the technical problem of how to improve the measurement accuracy of the battery expansion force in the related technology. According to one embodiment of the application, a calculation method of battery expansion force is provided, which comprises the steps of determining historical working condition parameters of a battery in operation, wherein the historical working condition parameters at least comprise historical thickness parameters, historical gas production and historical battery expansion force, constructing a battery expansion force calculation model according to the corresponding relation among the historical thickness parameters, the historical gas production and the historical battery expansion force, and calculating the current thickness parameters and the current gas production by using the battery expansion force calculation model to obtain target battery expansion force. In one exemplary embodiment, a battery expansion force calculation model is constructed according to the corresponding relation among the historical thickness parameter, the historical gas production amount and the historical battery expansion force, and the battery expansion force calculation model comprises the steps of determining a first function corresponding to the historical thickness parameter and a second function corresponding to the historical gas production amount, wherein the first function is used for representing the first corresponding relation between the historical thickness parameter and the historical battery expansion force, the second function is used for representing the second corresponding relation between the historical gas production amount and the historical battery expansion force, and the battery expansion force calculation model is obtained through the first function and the second function. In an exemplary embodiment, the historical operating condition parameters further comprise initial battery pretightening force, and the battery swelling force calculation model is obtained by utilizing the first function and the second function, and comprises the steps of determining a function constant term corresponding to the initial battery pretightening force, and obtaining the battery swelling force calculation model based on the first function, the second function and the function constant term. In one exemplary embodiment, the first function is f (1) =k1×thk, the second function is f (2) =k2×gas, k1 is a constant, k2 is a constant, THK represents the historical thickness parameter, and Gas is the historical Gas production. In an exemplary embodiment, the current thickness parameter at least includes a current storage hardness, and before calculating the current thickness parameter and the current gas production amount using the battery expansion force calculation model to obtain the target battery ex