Mobile QR Code QR CODE : The Korean Institute of Power Electronics
Title An AC Impedance Spectrum Measurement Device for the Battery Module to Predict the Remaining Useful Life of the Lithium-Ion Batteries
Authors Seung-June Lee ; Farooq Farhan ; Asad Khan ; Woo-Jin Choi
DOI 10.6113/TKPE.2020.25.4.251
Page pp.251-260
ISSN 1229-2214
Keywords Lithium-ion battery; Second-life batteries; State of health; AC impedance spectrum; Electrochemical impedance spectroscopy
Abstract A growing interest has emerged in recycling used automobile batteries into energy storage systems (ESSs) to prevent their harmful effects to the environment from improper disposal and to recycle such resources. To transform used batteries into ESSs, composing battery modules with similar performance by grading them is crucial. Imbalance among battery modules degrades the performance of an entire system. Thus, the selection of modules with similar performance and remaining life is the first prerequisite in the reuse of used batteries. In this study, we develop an instrument to measure the impedance spectrum of a battery module to predict the useful remaining life of the used battery. The developed hardware and software are used to apply the AC perturbation to the used battery module and measure its impedance spectrum. The developed instrument can measure the impedance spectrum of the battery module from 0.1 Hz to 1 kHz and calculate the equivalent circuit parameters through curve fitting. The performance of the developed instrument is verified by comparing the measured impedance spectra with those obtained by a commercial equipment.