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Sinusoidal-Ripple-Current Charging Strategy and Optimal Charging Frequency Study for Li-Ion Batteries

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4 Author(s)
Liang-Rui Chen ; Dept. of Electr. Eng., Nat. Changhua Univ. of Educ., Changhua, Taiwan ; Shing-Lih Wu ; Deng-Tswen Shieh ; Tsair-Rong Chen

In this paper, the sinusoidal-ripple-current (SRC) charging strategy for a Li-ion battery is proposed. The ac-impedance analysis is used to explore the optimal charging frequency. Experiments indicate that the optimal charging performance can be achieved by the proposed SRC with the minimum-ac-impedance frequency fZmin. Compared with the conventional constant-current constant-voltage charging strategy, the charging time, the charging efficiency, the maximum rising temperature, and the lifetime of the Li-ion battery are improved by about 17%, 1.9%, 45.8%, and 16.1%, respectively.

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Industrial Electronics, IEEE Transactions on  (Volume:60 ,  Issue: 1 )