Active Battery Voltage Equalization Based on Chain-Loop Comparison Strategy

Kuo-Ing Hwu (), Yuan-Hua Lin and Jenn-Jong Shieh
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Kuo-Ing Hwu: Department of Electrical Engineering, National Taipei University of Technology, No. 1, Sec. 3, Zhongxiao E. Rd., Taipei 10608, Taiwan
Yuan-Hua Lin: Monolithic Power System, 29F, No. 97, Sec.1, Xintai 5th Rd., Xizhi Dist., New Taipei City 22175, Taiwan
Jenn-Jong Shieh: Department of Electrical Engineering, Feng Chia University, No. 100, Wenhwa Road, Seatwen, Taichung 40724, Taiwan

Energies, 2024, vol. 17, issue 20, 1-26

Abstract: This paper describes active battery balancing based on a bidirectional buck converter, a flyback converter, and battery cells by using the proposed chain-loop comparison strategy. The role of the bidirectional buck converter is to charge/discharge the battery pack. During the charging period, the converter is in buck mode, and its output is controlled by constant current/voltage; during the discharging period, the converter is in boost mode, and its output is controlled by constant voltage. The role of the flyback converter is voltage equalization of the battery pack, and its output is controlled by constant current. A chain-loop comparison strategy is used to control battery voltage equalization. In this work, three equalization modes, namely, charging balance, discharging balance, and static balance, were considered. The voltage difference between the maximum and minimum is 0.007 V after a balancing time of 19.75 min, 0.005 V after a balancing time of 24 min, and 0.007 V after a balancing time of 20 min for charging balance, discharging balance, and static balance, respectively.

Keywords: active battery balancing; chain-loop comparison; voltage equalization; charging balance; discharging balance; charging bidirectional buck converter; flyback converter; static balance (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: 2024
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