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Energies 2014, 7(5), 3438-3452; doi:10.3390/en7053438

Fast Estimation of State of Charge for Lithium-Ion Batteries

2,*  and 2
1 Department of Mobile Technology, Toko University,51, Sec. 2, Xuefu Rd., Puzi City, Chiayi County 61363, Taiwan 2 Department of Electrical Engineering, National Chin-Yi University of Technology, 57, Sec. 2, Chungshan Rd., Taiping Dist., Taichung 41107, Taiwan
* Author to whom correspondence should be addressed.
Received: 14 March 2014 / Revised: 12 May 2014 / Accepted: 19 May 2014 / Published: 22 May 2014


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.
Keywords: lithium-ion battery; state of charge; AC impedance lithium-ion battery; state of charge; AC impedance
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Wu, S.-L.; Chen, H.-C.; Chou, S.-R. Fast Estimation of State of Charge for Lithium-Ion Batteries. Energies 2014, 7, 3438-3452.

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