Journal
INNOVATIVE SOLUTIONS FOR ENERGY TRANSITIONS
Volume 158, Issue -, Pages 2649-2654Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.egypro.2019.02.017
Keywords
Li-ion battery; active equalizer; bidirectional DC-DC converter; battery management system
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A novel active equalizer for Li-ion battery pack in electric vehicles is designed. Based on cell-to-pack-to-cell topology, the equalizer consists of a switch array and a single-ended forward bidirectional DC-DC converter, which is simple, efficient and reliable. During discharging process, energy flows from the most charged cell to the battery pack, realizing peak-cut equalization. During charging process, energy transfers from the whole battery pack to the least charged cell, enabling valley-filled equalization. Using synchronous rectification, the equalizer therefore has less conduction loss. Finally, a battery management system (BMS) experimental platform for a 6-series Li-ion battery pack is set up. The experimental results show that it can quickly reduce the difference between maximum and minimum SOC value to less than 5%, which prove the feasibility and effectiveness of the designed equalizer. (C) 2019 The Authors. Published by Elsevier Ltd.
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