Journal
JOURNAL OF POWER SOURCES
Volume 324, Issue -, Pages 694-703Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2016.05.121
Keywords
Lithium-ion cell; Open Circuit Voltage (OCV) curve adjustment; Battery aging estimation
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This paper is a contribution to lithium-ion batteries modelling taking into account aging effects. It first analyses the impact of aging on electrode stoichiometry and then on lithium-ion cell Open Circuit Voltage (OCV) curve. Through some hypotheses and an appropriate definition of the cell state of charge, it shows that each electrode equilibrium potential, but also the whole cell equilibrium potential can be modelled by a polynomial that requires only one adjustment parameter during aging. An adjustment algorithm, based on the idea that for two fixed OCVs, the state of charge between these two equilibrium states is unique for a given aging level, is then proposed. Its efficiency is evaluated on a battery pack constituted of four cells. (C) 2016 Published by Elsevier B.V.
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