Journal of the Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회논문지)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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Detection Algorithm and Extract of Deviation Parameters for Battery Pack Based on Internal Resistance Aging

저항 열화 기반의 배터리 팩 편차 파라미터 추출 방안 및 검출 알고리즘

  • Song, Jung-Yong (Department of Electrical Engineering, Inha University) ;
  • Huh, Chang-Su (Department of Electrical Engineering, Inha University)
  • Received : 2018.08.21
  • Accepted : 2018.09.09
  • Published : 2018.11.01
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Abstract

A large number of lithium-ion batteries are arranged in series and parallel in battery packs, such as those in electric vehicles or energy storage systems. As battery packs age, their output power and energy density drop because of voltage deviation, constant and non-uniform exposure to abnormal environments, and increased contact resistance between batteries; this reduces application system efficiency. Despite the balancing circuit and logic of the battery management system, the output of the battery pack is concentrated in the most severely aged unit cell and the output is frequently limited by power derating. In this study, we implemented a cell imbalance detection algorithm and selected parameters to detect a sudden decrease in battery pack output. In addition, we propose a method to increase efficiency by applying the measured testing values considering the operating conditions and abnormal conditions of the battery pack.

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References

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