Online estimation of an electric vehicle Lithium-Ion battery using recursive least squares with forgetting

Xiaosong Hu*, Fengchun Sun, Yuan Zou, Huei Peng

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

100 Citations (Scopus)

Abstract

A battery model that is suitable for real-time State-of-Charge (SOC) estimation of a Lithium-Ion battery is presented in this paper. The battery open circuit voltage (OCV) as a function of SOC is described by an adaptation of the Nernst equation. The analytical representation can facilitate Kalman filtering or observer-based SOC estimation methods. A zero-state hysteresis correction term is used to depict the hysteresis effect of the battery. A parallel resistance-capacitance (RC) network is used to depict the relaxation effect of the battery. A linear discrete-time formulation of the battery model is derived. A recursive least squares algorithm with forgetting is applied to implement the online parameter calibration. Validation results show that the calibrated model can accurately simulate the dynamic voltage behavior of the Lithium-Ion battery for two different experimental data sets.

Original languageEnglish
Title of host publicationProceedings of the 2011 American Control Conference, ACC 2011
Pages935-940
Number of pages6
Publication statusPublished - 2011
Event2011 American Control Conference, ACC 2011 - San Francisco, CA, United States
Duration: 29 Jun 20111 Jul 2011

Publication series

NameProceedings of the American Control Conference
ISSN (Print)0743-1619

Conference

Conference2011 American Control Conference, ACC 2011
Country/TerritoryUnited States
CitySan Francisco, CA
Period29/06/111/07/11

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