Comparative Analysis of Features for Determining State of Health in Lithium-Ion Batteries

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Published Oct 22, 2020
DOI https://doi.org/10.36001/ijphm.2013.v4i1.1437
Nick Williard
Center for Advanced Life Cycle Engineering, College Park, Maryland, 20742, USA
Wei He
Center for Advanced Life Cycle Engineering, College Park, Maryland, 20742, USA
Michael Osterman
Center for Advanced Life Cycle Engineering, College Park, Maryland, 20742, USA
Michael Pecht
Center for Advanced Life Cycle Engineering, College Park, Maryland, 20742, USA

Abstract

Traditionally, capacity and resistance have been used as the features to determine the state of health of lithium-ion batteries. In the present study, two additional features, the length of time of the constant current and the constant voltage phases of charging were used as additional indicators of state of health. To compare the appropriateness of each state of health feature, batteries were subjected to different discharge profiles and tested to failure. For each cycle, capacity, resistance, length of the constant current charge time and length of the constant voltage charge time were measured and compared based on their usefulness to estimate the state of health. Lastly, all the features were combined to give a fusion result for state of health estimation.

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Keywords

State of Health, fusion, lithium ion battery, State Estimation

References
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Issue
Vol. 4 No. 1 (2013): International Journal of Prognostics and Health Management
Section
Technical Briefs