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

Xiaopeng TANG; Yujie WANG; Zonghai CHEN

doi:10.1016/j.jpowsour.2015.07.028

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 Publications › Journal Article (refereed) › peer-review

155 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 language	English
Article number	21469
Pages (from-to)	23-29
Number of pages	7
Journal	Journal of Power Sources
Volume	296
Early online date	21 Jul 2015
DOIs	https://doi.org/10.1016/j.jpowsour.2015.07.028
Publication status	Published - 20 Nov 2015
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2015 Elsevier B.V.

Funding

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 ).

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

SDG 7 Affordable and Clean Energy

Keywords

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

Access to Document

10.1016/j.jpowsour.2015.07.028

Cite this

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

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.",

keywords = "Dual-circuit, Electronic vehicles, LiFePO batteries, State observer, State-of-charge",

author = "Xiaopeng TANG and Yujie WANG and Zonghai CHEN",

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T1 - A method for state-of-charge estimation of LiFePO4 batteries based on a dual-circuit state observer

AU - TANG, Xiaopeng

AU - WANG, Yujie

AU - CHEN, Zonghai

PY - 2015/11/20

Y1 - 2015/11/20

N2 - 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.

AB - 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.

KW - Dual-circuit

KW - Electronic vehicles

KW - LiFePO batteries

KW - State observer

KW - State-of-charge

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