A method for state-of-charge estimation of LiFePO4 batteries based on a dual-circuit state observer

Xiaopeng TANG, Yujie WANG, Zonghai CHEN*

*Corresponding author for this work

Research output: Journal PublicationsJournal Article (refereed)peer-review

124 Citations (Scopus)

Abstract

Abstract Estimation of state-of-charge (SOC) is a key criterion to evaluate the battery management system (BMS). Due to the flat open-circuit voltage (OCV)-SOC curve of LiFePO4 batteries, it is a great challenge to estimate the SOC accurately. Here we present a dual-circuit state observer for SOC estimation of LiFePO4 batteries. It is a combination of an open loop based current integrator and a proportional-integral (PI) based state observer. We also employed an easy but practical drifting current corrector to restrain the influence of the drifting current. The experiment results show that error of the estimated SOC is less than 2.5% by the proposed method when the initial SOC is unknown. We proved that with no matrix operations, the proposed method is lighted-weighted and high efficient, which is suitable for embedded systems.

Original languageEnglish
Article number21469
Pages (from-to)23-29
Number of pages7
JournalJournal of Power Sources
Volume296
Early online date21 Jul 2015
DOIs
Publication statusPublished - 20 Nov 2015
Externally publishedYes

Bibliographical note

Funding Information:
This work is supported by the National Natural Science Fund of China (Grant No. 61375079 ) and the Fundamental Research Funds for the Central Universities ( WK2100100025 ).

Publisher Copyright:
© 2015 Elsevier B.V.

Keywords

  • Dual-circuit
  • Electronic vehicles
  • LiFePO batteries
  • State observer
  • State-of-charge

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