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Enhanced Equivalent Circuit Modeling for Li-ion Battery Using Recursive Parameter Correction

  • Ko, Sung-Tae (Department of Electrical and Computer Engineering, Sungkyunkwan University) ;
  • Ahn, Jung-Hoon (Department of Electrical and Computer Engineering, Sungkyunkwan University) ;
  • Lee, Byoung Kuk (Department of Electrical and Computer Engineering, Sungkyunkwan University)
  • Received : 2017.04.26
  • Accepted : 2017.11.06
  • Published : 2018.05.01

Abstract

This paper presents an improved method to determine the internal parameters for improving accuracy of a lithium ion battery equivalent circuit model. Conventional methods for the parameter estimation directly using the curve fitting results generate the phenomenon to be incorrect due to the influence of the internal capacitive impedance. To solve this phenomenon, simple correction procedure with transient state analysis is proposed and added to the parameter estimation method. Furthermore, conventional dynamic equation for correction is enhanced with advanced RC impedance dynamic equation so that the proposed modeling results describe the battery dynamic characteristics more exactly. The improved accuracy of the battery model by the proposed modeling method is verified by single cell experiments compared to the other type of models.

Acknowledgement

Supported by : Ministry of Trade, Industry & Energy (MI)

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