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A Study on the Parameters Estimation for SOC and SOH of the Battery

SOC 및 SOH 추정을 위한 파라미터 추정기법에 관한 연구

  • Park, Sung-Jun (Dept. of Electrical Engineering, Chonnam National University) ;
  • Song, Gwang-Suk (Dept. of Electrical Engineering, Chonnam National University) ;
  • Park, Seong-Mi (Dept. of Lift Engineering, Korea Lift College)
  • 박성준 (전남대학교 전기공학과) ;
  • 송광석 (전남대학교 전기공학과) ;
  • 박성미 (한국승강기대학교 승강기공학부)
  • Received : 2020.08.26
  • Accepted : 2020.09.16
  • Published : 2020.10.31

Abstract

As the battery ages, the internal resistance of the battery increases, so the loss due to the internal resistance increases at the same charging current, causing the battery temperature to rise, which further accelerates battery aging. Therefore, it is necessary to optimize the charging conditions according to the aging of the battery or the current charge amount, and to accurately estimate this, estimation of the parameters of the equivalent circuit is most important. This paper proposes a new measurement technique that can measure the internal resistance of a battery by analyzing a specific high frequency voltage and current applied to the battery. In addition, in order to test the validity of the proposed measurement technique, the current charging amount was estimated based on the measured internal resistance, and the terminal voltage of the constant current charging mode was automatically set and operated. As a result, good results were obtained regardless of the battery voltage. If this equipment is installed in the charging device, it is believed that it will be of great help in the stability management of the aging reusable battery.

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