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Open AccessArticle

A Low Cost and Fast Cell-to-Cell Balancing Circuit for Lithium-Ion Battery Strings

Department of Electrical Engineering, Soongsil University, Seoul 06978, Korea
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Author to whom correspondence should be addressed.
Electronics 2020, 9(2), 248; https://doi.org/10.3390/electronics9020248
Received: 3 January 2020 / Revised: 28 January 2020 / Accepted: 29 January 2020 / Published: 3 February 2020
(This article belongs to the Special Issue High Power Electric Traction Systems)
This paper proposes a fast cell-to-cell balancing circuit for lithium-ion battery strings. The proposed method uses only one push-pull converter to transfer energy between high- and low-voltage cells directly for a fast balancing speed. The switch network for selecting a certain pair of cells is implemented using relays to achieve a low cost. The control circuit is composed of a battery-monitoring IC and a digital signal processor (DSP) to monitor the cell voltage and to protect the batteries. In order to prove the validity of the proposed method, a prototype circuit is built with twelve lithium-ion batteries in a string. The experimental results show that it takes only 50 min to balance twelve lithium-ion batteries during the charge with 89.5% maximum efficiency. The outstanding performance of the proposed cell balancing circuit is verified through its comparison with other methods in terms of several factors, such as the balancing time and the implementation cost. View Full-Text
Keywords: cell-to-cell balancing; battery management system (BMS); charge equalizer; push-pull converter cell-to-cell balancing; battery management system (BMS); charge equalizer; push-pull converter
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Pham, V.-L.; Duong, V.-T.; Choi, W. A Low Cost and Fast Cell-to-Cell Balancing Circuit for Lithium-Ion Battery Strings. Electronics 2020, 9, 248.

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