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Fast Estimation of State of Charge for Lithium-Ion Batteries

Author

Listed:
  • Shing-Lih Wu

    (Department of Mobile Technology, Toko University,51, Sec. 2, Xuefu Rd., Puzi City, Chiayi County 61363, Taiwan)

  • Hung-Cheng Chen

    (Department of Electrical Engineering, National Chin-Yi University of Technology, 57, Sec. 2, Chungshan Rd., Taiping Dist., Taichung 41107, Taiwan)

  • Shuo-Rong Chou

    (Department of Electrical Engineering, National Chin-Yi University of Technology, 57, Sec. 2, Chungshan Rd., Taiping Dist., Taichung 41107, Taiwan)

Abstract

This paper presents a novel impedance-based approach to efficiently estimate the state of charge (SOC) of a Li-ion battery. By using an AC impedance analyzer, a database is constructed, containing records of AC impedance versus SOC. In practical applications, the SOC values can be found instantly once the contents of the database are referenced. For validation purposes, AC impedance comparisons are conducted using AC impedance analyzer as a benchmark at SOC of 0%, 50% and 100%, which indicate errors of 8.636%, 2.604% and 0.600%, respectively.

Suggested Citation

  • Shing-Lih Wu & Hung-Cheng Chen & Shuo-Rong Chou, 2014. "Fast Estimation of State of Charge for Lithium-Ion Batteries," Energies, MDPI, vol. 7(5), pages 1-15, May.
    • Handle: RePEc:gam:jeners:v:7:y:2014:i:5:p:3438-3452:d:36350
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