Equivalent hysteresis model based SOC estimation with variable parameters considering temperature

Yao He; Qiang Li; Xinxin Zheng; Xintian Liu

Equivalent hysteresis model based SOC estimation with variable parameters considering temperature

Vol. 21, No. 3, pp. 590-602, Mar. 2021

10.1007/s43236-020-00213-5

Hysteresis characteristic

Variable parameter

Equivalent circuit model

State of charge

Modified covariance extended kalman filter (MVEKF)

Abstract

Estimation of the state of charge (SOC) of a lithium-ion battery is one of the key technologies in battery management systems. The accuracy of SOC estimation mainly depends on the accuracy of the battery model. The traditional Thevenin model has limited application due to its fixed parameters. In addition, its accuracy is not high. This paper proposes a variable parameter equivalent hysteresis model based on the Thevenin model. The parameters of this model are regarded as variables that vary with temperature and SOC. They can be identified by hybrid pulse power characteristic (HPPC) experiments. In addition, the model also considers the hysteresis characteristics of the open circuit voltage (OCV) and uses a mathematical recursive equation to describe it. Experimental and simulation results show that the proposed model has a higher accuracy and a wider application than the Thevenin model. On the basis of this model, SOC estimation is carried out based on modified covariance extended Kalman filter (MVEKF) at different temperatures. The results show that the SOC estimation accuracy of the MVEKF method is significantly higher than that of an extended Kalman filter (EKF).

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Cite this article

[IEEE Style]

Y. He, Q. Li, X. Zheng, X. Liu, "Equivalent hysteresis model based SOC estimation with variable parameters considering temperature," Journal of Power Electronics, vol. 21, no. 3, pp. 590-602, 2021. DOI: 10.1007/s43236-020-00213-5.

[ACM Style]

Yao He, Qiang Li, Xinxin Zheng, and Xintian Liu. 2021. Equivalent hysteresis model based SOC estimation with variable parameters considering temperature. Journal of Power Electronics, 21, 3, (2021), 590-602. DOI: 10.1007/s43236-020-00213-5.