title: State of charge estimation of lithium-ion batteries using fractional order sliding mode observer.
abstract: This paper presents a state of charge (SOC) estimation method based on fractional order sliding mode observer (SMO) for lithium-ion batteries. A fractional order RC equivalent circuit model (FORCECM) is firstly constructed to describe the charging and discharging dynamic characteristics of the battery. Then, based on the differential equations of the FORCECM, fractional order SMOs for SOC, polarization voltage and terminal voltage estimation are designed. After that, convergence of the proposed observers is analyzed by Lyapunov's stability theory method. The framework of the designed observer system is simple and easy to implement. The SMOs can overcome the uncertainties of parameters, modeling and measurement errors, and present good robustness. Simulation results show that the presented estimation method is effective, and the designed observers have good performance.
authors.affiliation: School of Aeronautics and Astronautics, University of Electronic Science and Technology of China, Chengdu, Sichuan Province611731, PR China. Electronic address: zhongqs@uestc.edu.cn.
authors.forename: Qishui
authors.initials: Q
authors.lastname: Zhong
authors.affiliation: School of Aeronautics and Astronautics, University of Electronic Science and Technology of China, Chengdu, Sichuan Province611731, PR China. Electronic address: zhongfulicn@163.com.
authors.forename: Fuli
authors.initials: F
authors.lastname: Zhong
authors.affiliation: School of Science, Hubei University for Nationalities, Enshi, Hubei Province445000, PR China.
authors.forename: Jun
authors.initials: J
authors.lastname: Cheng
authors.affiliation: School of Aeronautics and Astronautics, University of Electronic Science and Technology of China, Chengdu, Sichuan Province611731, PR China.
authors.forename: Hui
authors.initials: H
authors.lastname: Li
authors.affiliation: School of Mathematical Sciences, University of Electronic Science and Technology of China, Chengdu, Sichuan Province611731, PR China.
authors.forename: Shouming
authors.initials: S
authors.lastname: Zhong
keywords: Fractional order RC equivalent circuit model; Lithium-ion battery; Sliding mode observer; State of charge estimation