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An Exploration of Li-ion Cell Relaxation Using EIS
FISITA2014/F2014-EPT-057

Authors

Barai, Anup; Guo, Yue; McGordon, Andrew; Jennings, Paul; - University of Warwick

Abstract

This paper describes a systematic study of the effect of cell relaxation after a charge or discharge event. The EIS technique was used to investigate how the properties of the cells changed with time after charge or discharge up to a maximum of 15 hours. It was found that different chemistries show different relaxation rates and frequency dependence of Ro and Rd. The cells still showed a relaxation at 15 hours after a charge/discharge event. A suggested compromise of measurement accuracy and test length is to measure the properties of cells 4 hours after a charge/discharge event.

KEYWORDS EIS, impedance, Li-ion battery, relaxation, testing

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