A Novel Sliding Mode Observer for State of Charge Estimation of EV Lithium Batteries


Vol. 16, No. 3, pp. 1131-1140, May  2016
10.6113/JPE.2016.16.3.1131


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 Abstract

A simple design for a sliding mode observer is proposed for EV lithium battery SOC estimation in this paper. The proposed observer does not have the limiting conditions of existing observers. Compared to the design of previous sliding mode observers, the new observer does not require a solving matrix equation and it does not need many observers for all of the state components. As a result, it is simple in terms of calculations and convenient for engineering applications. The new observer is suitable for both time-variant and time-invariant models of battery SOC estimation, and the robustness of the new observer is proved by Liapunov stability theorem. Battery tests are performed with simulated FUDS cycles. The proposed observer is used for the SOC estimation on both unchanging parameter and changing parameter models. The estimation results show that the new observer is robust and that the estimation precision can be improved base on a more accurate battery model.


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Cite this article

[IEEE Style]

Q. Chen, J. Jiang, S. Liu, C. Zhang, "A Novel Sliding Mode Observer for State of Charge Estimation of EV Lithium Batteries," Journal of Power Electronics, vol. 16, no. 3, pp. 1131-1140, 2016. DOI: 10.6113/JPE.2016.16.3.1131.

[ACM Style]

Qiaoyan Chen, Jiuchun Jiang, Sijia Liu, and Caiping Zhang. 2016. A Novel Sliding Mode Observer for State of Charge Estimation of EV Lithium Batteries. Journal of Power Electronics, 16, 3, (2016), 1131-1140. DOI: 10.6113/JPE.2016.16.3.1131.