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Z-score Based Abnormal Detection for Stable Operation of the Series/Parallel-cell Configured Battery Pack

직병렬조합 배터리팩의 안전운용을 위한 Z-score 기반 이상 동작 검출 방법

  • Kang, Deokhun (Dept. of Electrical Engineering, Chungnam National University) ;
  • Lee, Pyeong-Yeon (Dept. of Electrical Engineering, Chungnam National University) ;
  • Kim, Deokhan (Dept. of Electrical Engineering, Chungnam National University) ;
  • Kim, Seung-Keun (Plant Engineering Team, Production Development Division, Automotive, Hyundai Motor Group) ;
  • Kim, Jonghoon (Dept. of Electrical Engineering, Chungnam National University)
  • Received : 2021.05.03
  • Accepted : 2021.08.05
  • Published : 2021.12.31

Abstract

Lithium-ion batteries have been designed and used as battery packs with series and parallel combinations that are suitable for use. However, due to its internal electrochemical properties, producing the battery's condition at the same value is impossible for individual cells. In addition, the management of characteristic deviations between individual cells is essential for the safe and efficient use of batteries as aging progresses with the use of batteries. In this work, we propose a method to manage deviation properties and detect abnormal behavior in the configuration of a combined battery pack of these multiple battery cells. The proposed method can separate and detect probabilistic low-frequency information according to statistical information based on Z-score. The verification of the proposed algorithm was validated using experimental results from 10S3P battery packs, and the implemented algorithm based on Z-score was validated as a way to effectively manage multiple individual cell information.

Keywords

Acknowledgement

본 연구는 산업통상자원부(MOTIE)와 산업기술평가관리원(KEIT) 지원을 받아 수행한 연구과제(No. 20011626) 및 한국전력공사 연구비(R21XO01-3) 지원을 받아 수행한 연구 결과입니다.

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