Journal of the Korean institute of surface engineering (한국표면공학회지)

The Korean Institute of Surface Engineering (한국표면공학회)
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Degradation diagnosis of parallel-connected lithium-ion battery cells via non-constructive electrochemical approach

병렬 연결된 리튬이온전지 셀의 비파괴 전기화학적 열화상태 진단

  • Lee, Garam (Department of Chemical and Chemical Engineering, Inha University) ;
  • Jeong, Jiyoon (Department of Chemical and Chemical Engineering, Inha University) ;
  • Kim, Yong-Tae (Department of Chemical and Chemical Engineering, Inha University) ;
  • Choi, Jinsub (Department of Chemical and Chemical Engineering, Inha University)
  • 이가람 (인하대학교 화학공학과) ;
  • 정지윤 (인하대학교 화학공학과) ;
  • 김용태 (인하대학교 화학공학과) ;
  • 최진섭 (인하대학교 화학공학과)
  • Received : 2022.08.19
  • Accepted : 2022.08.23
  • Published : 2022.08.31
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Abstract

As environmental pollution becomes more serious, the demand for electric vehicles (EVs) and lithium-ion batteries for electric vehicles is rapidly increasing worldwide. Accordingly, the amount of waste batteries is also increasing, and a technology for recycling and reusing them is required. In order to reuse a used battery, it is necessary to non-destructively diagnose the deterioration condition of the battery. Therefore, in this study, we investigate the diagnosis of degradation for parallel-connected lithium-ion battery cells through non-constructive electrochemical approach. As the number of parallel-connected cells increased, in addition to linear degradation, abrupt step-like degradation occurred, which is attributed to the predominant degradation of specific cells. In addition, it is confirmed that deteriorated cells among multiple cells can be distinguished through a simple measurement of open circuit voltage (OCV).

Keywords

Acknowledgement

본 연구는 2020-2022학년도 한국에이브이엘(주)의 지원에 의하여 연구되었음.

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