2018 IEEE International Conference on Prognostics and Health Management (ICPHM), 11-13 June, 2018, Seattle, WA, USA

An Online State of Health Estimation Method for Lithium-ion Batteries Based on Integrated Voltage

Yapeng Zhou1, Miaohua Huant1, and Michael Pecht2,
1School of Automotive Engineering Wuhan University of Technology Wuhan, China
2Center of Advanced Life Cycle Engineering University of Maryland College Park, USA


A fundamental function of a battery management system is state of health estimation. While there are numerous methods to make this estimation, the constant current-constant voltage charge phase can be used, and in fact, the integrated voltage over time within the terminal voltage of 3.85 V4.2 V during the charge phase has a strong linear correlation with state of health. To test this hypothesis, data from batteries which were run through accelerated aging tests were assessed with various methods. Estimates were made to demonstrate the effectiveness and accuracy of the developed method.

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