State of Charge Estimation for Lithium-Ion Battery with a Temperature-Compensated Model

Shichun Yang, Cheng Deng, Yulong Zhang and Yongling He
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Shichun Yang: School of Transportation Science and Engineering, Beihang University, Beijing 100191, China
Cheng Deng: School of Transportation Science and Engineering, Beihang University, Beijing 100191, China
Yulong Zhang: School of Transportation Science and Engineering, Beihang University, Beijing 100191, China
Yongling He: School of Transportation Science and Engineering, Beihang University, Beijing 100191, China

Energies, 2017, vol. 10, issue 10, 1-14

Abstract: Accurate estimation of the state of charge (SOC) of batteries is crucial in a battery management system. Many studies on battery SOC estimation have been investigated recently. Temperature is an important factor that affects the SOC estimation accuracy while it is still not adequately addressed at present. This paper proposes a SOC estimator based on a new temperature-compensated model with extended Kalman Filter (EKF). The open circuit voltage (OCV), capacity, and resistance and capacitance (RC) parameters in the estimator are temperature dependent so that the estimator can maintain high accuracy at various temperatures. The estimation accuracy decreases when applied in high current continuous discharge, because the equivalent polarization resistance decreases as the discharge current increases. Therefore, a polarization resistance correction coefficient is proposed to tackle this problem. The estimator also demonstrates a good performance in dynamic operating conditions. However, the equivalent circuit model shows huge uncertainty in the low SOC region, so measurement noise variation is proposed to improve the estimation accuracy there.

Keywords: Lithium-ion batteries; state of charge; temperature-compensated model; EKF (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2017
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (10)

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