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http://dx.doi.org/10.5695/JSSE.2022.55.4.231

Degradation diagnosis of parallel-connected lithium-ion battery cells via non-constructive electrochemical approach  

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)
Publication Information
Journal of the Korean institute of surface engineering / v.55, no.4, 2022 , pp. 231-235 More about this Journal
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
Degradation diagnosis; Parallel-connected cells; Open circuit voltage; Lithium-ion batteries;
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