Lithium-ion Open Circuit Voltage (OCV) curve modelling and its ageing adjustment

Lithium-ion Open Circuit Voltage (OCV) curve modelling and its ageing adjustment 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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Power Sources Elsevier

Lithium-ion Open Circuit Voltage (OCV) curve modelling and its ageing adjustment

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Publisher
Elsevier
Copyright
Copyright © 2016 Elsevier Ltd
ISSN
0378-7753
D.O.I.
10.1016/j.jpowsour.2016.05.121
Publisher site
See Article on Publisher Site

Abstract

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.

Journal

Journal of Power SourcesElsevier

Published: Aug 30, 2016

References

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