A novel active equalizer for Li-ion battery pack in electric vehicles. (February 2019)

• Record Type: Journal Article
• Authors: Liu, Yu; Xia, Chaoying; Gu, Miao; Xin, Wei; Men, Xuming
• Is Part Of: Energy procedia. Volume 158(2019)
• Page Start: 2649
• Page End: 2654
• Publication Date: 2019-02
• Subjects: Li-ion battery -- active equalizer -- bidirectional DC-DC converter -- battery management system; Power resources -- Congresses; Power resources -- Periodicals; Power resources; Conference proceedings; Periodicals; 333.7905
• DOI: 10.1016/j.egypro.2019.02.017
• Languages: English
• ISSNs: 1876-6102

Abstract

Abstract: 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.