State of the Art of Lithium-Ion Battery SOC Estimation for Electrical Vehicles

Ruifeng Zhang, Bizhong Xia, Baohua Li, Libo Cao, Yongzhi Lai, Weiwei Zheng, Huawen Wang and Wei Wang
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Ruifeng Zhang: Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China
Bizhong Xia: Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China
Baohua Li: Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China
Libo Cao: College of Mechanical and Vehicle Engineering, Hunan University, Changsha 410082, China
Yongzhi Lai: Sunwoda Electronic Co., Ltd., Shenzhen 518108, China
Weiwei Zheng: Sunwoda Electronic Co., Ltd., Shenzhen 518108, China
Huawen Wang: Sunwoda Electronic Co., Ltd., Shenzhen 518108, China
Wei Wang: Sunwoda Electronic Co., Ltd., Shenzhen 518108, China

Energies, 2018, vol. 11, issue 7, 1-36

Abstract: Sate of charge (SOC) accurate estimation is one of the most important functions in a battery management system for battery packs used in electrical vehicles. This paper focuses on battery SOC estimation and its issues and challenges by exploring different existing estimation methodologies. The key technologies of lithium-ion battery state estimation methodologies of the electrical vehicles categorized under five groups, such as the conventional method, adaptive filter algorithm, learning algorithm, nonlinear observer, and the hybrid method, are explored in an in-depth analysis. Lithium-ion battery characteristic, battery model, estimation algorithm, and cell unbalancing are the most important factors that affect the accuracy and robustness of SOC estimation. Finally, this paper concludes with the challenges of SOC estimation and suggests other directions for possible research efforts.

Keywords: lithium-ion battery; sate of charge; estimation algorithm; battery management system; electric vehicle (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: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (40)

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