Modeling Battery Behavior for Accurate State-of-Charge Indication

V. Pop, H.J. Bergveld, J.H.G. Op het Veld, Paulus P.L. Regtien, D. Danilov, P.H.L. Notten

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Abstract

Li-ion is the most commonly used battery chemistry in portable applications nowadays. Accurate state-of-charge sOC and remaining run-time indication for portable devices is important for the user’s convenience and to prolong the lifetime of batteries. A new SOC indication system, combining the electromotive force EMF measurement during equilibrium and current measurement and integration during charge and discharge, has been developed and implemented in a laboratory setup. During discharge, apart from simple Coulomb counting, the effect of the overpotential is also considered. Mathematical models describing the EMF and the overpotential functions for a Li-ion battery have been developed. These models include a variety of parameters whose values depend on the determination method and experimental conditions. In this paper the battery measurement and modeling efforts are described. The method of implementing the battery model in an SOC indication system is also described. The aim is an SOC determination within 1% inaccuracy or better under all realistic user conditions, including a wide variety of load currents and a wide temperature range. The achieved results show the effectiveness of our novel approach for improving the accuracy of the SOC indication.
Original languageEnglish
Pages (from-to)A2013-A2022
Number of pages10
JournalJournal of the Electrochemical Society
Volume153
Issue number06EX1521/11
DOIs
Publication statusPublished - 2006

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Electromotive force
Electric potential
Electric current measurement
Ions
Mathematical models
Temperature
Battery management systems
Lithium-ion batteries

Keywords

  • EWI-9162
  • IR-61691
  • METIS-238274

Cite this

Pop, V., Bergveld, H. J., Op het Veld, J. H. G., Regtien, P. P. L., Danilov, D., & Notten, P. H. L. (2006). Modeling Battery Behavior for Accurate State-of-Charge Indication. Journal of the Electrochemical Society, 153(06EX1521/11), A2013-A2022. https://doi.org/10.1149/1.2335951
Pop, V. ; Bergveld, H.J. ; Op het Veld, J.H.G. ; Regtien, Paulus P.L. ; Danilov, D. ; Notten, P.H.L. / Modeling Battery Behavior for Accurate State-of-Charge Indication. In: Journal of the Electrochemical Society. 2006 ; Vol. 153, No. 06EX1521/11. pp. A2013-A2022.
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Pop, V, Bergveld, HJ, Op het Veld, JHG, Regtien, PPL, Danilov, D & Notten, PHL 2006, 'Modeling Battery Behavior for Accurate State-of-Charge Indication' Journal of the Electrochemical Society, vol. 153, no. 06EX1521/11, pp. A2013-A2022. https://doi.org/10.1149/1.2335951

Modeling Battery Behavior for Accurate State-of-Charge Indication. / Pop, V.; Bergveld, H.J.; Op het Veld, J.H.G.; Regtien, Paulus P.L.; Danilov, D.; Notten, P.H.L.

In: Journal of the Electrochemical Society, Vol. 153, No. 06EX1521/11, 2006, p. A2013-A2022.

Research output: Contribution to journalArticleAcademicpeer-review

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AU - Pop, V.

AU - Bergveld, H.J.

AU - Op het Veld, J.H.G.

AU - Regtien, Paulus P.L.

AU - Danilov, D.

AU - Notten, P.H.L.

PY - 2006

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AB - Li-ion is the most commonly used battery chemistry in portable applications nowadays. Accurate state-of-charge sOC and remaining run-time indication for portable devices is important for the user’s convenience and to prolong the lifetime of batteries. A new SOC indication system, combining the electromotive force EMF measurement during equilibrium and current measurement and integration during charge and discharge, has been developed and implemented in a laboratory setup. During discharge, apart from simple Coulomb counting, the effect of the overpotential is also considered. Mathematical models describing the EMF and the overpotential functions for a Li-ion battery have been developed. These models include a variety of parameters whose values depend on the determination method and experimental conditions. In this paper the battery measurement and modeling efforts are described. The method of implementing the battery model in an SOC indication system is also described. The aim is an SOC determination within 1% inaccuracy or better under all realistic user conditions, including a wide variety of load currents and a wide temperature range. The achieved results show the effectiveness of our novel approach for improving the accuracy of the SOC indication.

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