Electrochemical modeling method for wide-temperature-range lithium ion battery

CN119475661APending Publication Date: 2025-02-18BEIJING JIAOTONG UNIV
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Patent Information

Application Number
CN202411352178.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-09-26
Publication Date
2025-02-18

AI Technical Summary

Technical Problem

The existing lithium-ion battery electrochemical model has low prediction accuracy in a wide temperature domain, especially under low temperature conditions, which is difficult to accurately describe the electrochemical behavior of the battery, resulting in insufficient simulation accuracy.

Method used

By conducting constant current charging tests for different temperatures and magnifications on lithium-ion batteries, combining one sensitivity analysis method at a time, we study the multi-dimensional impact of temperature, magnification and state of charge on electrochemical parameters, obtain the values ​​of high sensitivity parameters, and use the Fit the temperature correction equation for the normal temperature parameters, calculate the electrochemical parameter values ​​at low temperatures, and adjust the key parameters to establish a wide temperature domain electrochemical model.

Benefits of technology

It realizes the rapid and accurate construction of the lithium-ion battery electrochemical model in a wide temperature range, extracts parameters closely related to battery performance, provides theoretical support for battery aging diagnosis and intelligent management, and improves the reliability and safety of the battery.

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Abstract

The invention provides a wide-temperature-range lithium ion battery electrochemical modeling method which comprises the following steps: performing constant-current charging tests of different temperatures and different multiplying powers on a battery based on an integrated test tool, and detecting a voltage curve of the battery; the influence of multi-dimensional factors such as temperature, multiplying power and state of charge on the electrochemical parameter sensitivity of the lithium ion battery is systematically studied through a one-time-one-sensitivity analysis method; for high-sensitivity parameters extracted from a parameter sensitivity analysis result, fine numerical values of the high-sensitivity parameters need to be obtained emphatically and substituted into an electrochemical model of the lithium ion battery in a wide temperature range for calculation; in order to solve the problem that defects exist in the identification process of part of parameters at low temperature, parameter values obtained at normal temperature or above are fitted into a temperature correction equation to directly calculate electrochemical parameter values at low temperature, and after the electrochemical parameter values are substituted into an electrochemical model, the simulation precision of a wide-temperature-range model is effectively improved. The invention provides powerful guarantee for promoting the practical application of the lithium ion battery.
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