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Magnetic Coupling-Based Battery Impedance Measurement Method

Author

Listed:
  • Chushan Li

    (College of Electrical Engineering, Zhejiang University, Hangzhou 310081, China
    Zhejiang University–University of Illinois at Urbana-Champaign Institute, Zhejiang University, Haining 314400, China)

  • Junjie Mao

    (College of Electrical Engineering, Zhejiang University, Hangzhou 310081, China)

  • Qiang Wu

    (College of Electrical Engineering, Zhejiang University, Hangzhou 310081, China)

  • Yibo Deng

    (College of Electrical Engineering, Zhejiang University, Hangzhou 310081, China)

  • Jiande Wu

    (College of Electrical Engineering, Zhejiang University, Hangzhou 310081, China)

  • Wuhua Li

    (College of Electrical Engineering, Zhejiang University, Hangzhou 310081, China)

  • Xiangning He

    (College of Electrical Engineering, Zhejiang University, Hangzhou 310081, China)

Abstract

The battery impedance is an important indicator of battery health status. In this paper, a magnetic coupling-based impedance measurement method for electrochemical batteries is proposed. Without affecting the energy injection stage, the designed suppression resistance can minimize the influence of the primary circuit response, and the under-damped oscillation waveform containing the battery impedance information can be directly obtained on the primary inductance. The change of the mutual inductance value within a certain range will not affect the measurement results. Therefore, the measurement system has high stability and robustness. By utilizing the discrete Fourier transform (DFT)-based algorithm to calculate the damped oscillation parameters, the battery impedance is accurately derived from the calculated attenuation coefficient and damped oscillation frequency. The accuracy of this method under different coupling parameters is analyzed and verified by simulation and experiment on a Li-ion battery, which could be employed to estimate the state of charge (SOC).

Suggested Citation

  • Chushan Li & Junjie Mao & Qiang Wu & Yibo Deng & Jiande Wu & Wuhua Li & Xiangning He, 2021. "Magnetic Coupling-Based Battery Impedance Measurement Method," Energies, MDPI, vol. 14(22), pages 1-11, November.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:22:p:7490-:d:675491
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