Fast Estimation of State of Charge for Lithium-Ion Batteries

Energies

Shing-Lih Wu¹  Hung-Cheng Chen² 

[1] Department of Mobile Technology, Toko University,51, Sec. 2, Xuefu Rd., Puzi City, Chiayi County 61363, Taiwan; E-Mail:;Department of Electrical Engineering, National Chin-Yi University of Technology, 57, Sec. 2, Chungshan Rd., Taiping Dist., Taichung 41107, Taiwan; E-Mail:

关键词: lithium-ion battery;    state of charge;    AC impedance;   

DOI  :  10.3390/en7053438

来源: mdpi

【 摘 要 】

This paper presents a novel impedance-based approach to efficiently estimate the state of charge (SOC) of a Li-ion battery. By using an AC impedance analyzer, a database is constructed, containing records of AC impedance versus SOC. In practical applications, the SOC values can be found instantly once the contents of the database are referenced. For validation purposes, AC impedance comparisons are conducted using AC impedance analyzer as a benchmark at SOC of 0%, 50% and 100%, which indicate errors of 8.636%, 2.604% and 0.600%, respectively.

【 授权许可】

CC BY   
© 2014 by the authors; licensee MDPI, Basel, Switzerland.