Fast State of Charge Estimation for Lithium-ion Battery Based on Electrochemical Impedance Spectroscopy Frequency Feature Extraction

A fast SOC estimation method based on electrochemical impedance spectroscopy (EIS) dataset combined with a simplified electrochemical model is proposed in this paper. Firstly, the solution-phase lithium-ion diffusion model is stripped from the simplified electrochemical model to characterize the lit...

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Bibliographic Details
Main Authors: Kong, Laiqiang, Fang, Sidun, Niu, Tao, Chen, Guanhong, Liao, Ruijin
Format: Conference Proceeding
Language:English
Subjects:
Computational modeling
Correlation
Electrochemical impedance spectroscopy
Electrochemical model
Estimation
Feature extraction
Frequency estimation
Lithium-ion battery
State of charge
Temperature measurement
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Description
Summary:A fast SOC estimation method based on electrochemical impedance spectroscopy (EIS) dataset combined with a simplified electrochemical model is proposed in this paper. Firstly, the solution-phase lithium-ion diffusion model is stripped from the simplified electrochemical model to characterize the lithium-ion concentration change. Then, the key frequency feature for SOC estimation is extracted based on the correlation analysis between the solution-phase lithium-ion concentration and the EIS data. Finally, the proposed SOC estimation method is expanded to consider the influences of ambient temperature. Experimental study indicates that the integration of lithium-ion diffusion can significantly improve the accuracy and reduce the computational time compared with the traditional broadband domain method and the fractional order equivalent circuit model (FOECM).
ISSN:2158-4907
DOI:10.1109/ICPS57144.2023.10142117