CAPES Colloquium :Equalization Methods for Series-connected Batteries


Speaker:     Faxiang Peng

Time:        15:00-17:00, Dec. 11

Location:    SIST 1C-101 Auditorium

Host:        Prof. Haoyu Wang


Nowadays, Lithium-ion battery is widely utilized in uninterruptible power supplies, artificial satellites, and electric vehicles as energy storage systems due to its high energy density, low self-discharge rate, and no memory effect. Since the low terminal voltage of an individual battery cell, multiple battery cells have to be connected in series to meet the high voltage requirement. However, because of the differences in terms of capacity, internal resistance, and voltage among cells, the imbalance among the series-connected cells normally happens when the battery string is charging or discharging. Thus, certain cells may be overcharged or depleted, which leads to the decay of battery capacity and lifetime, and even incurs safety issues (e.g. fire or explosion). Therefore, battery equalizers are required to effectively mitigate cell mismatch issues, and to extend the battery life.

       This talk will first introduce a review of existing equalization methods, demonstrating the circuit structure and equalizing mechanism. Then, a hierarchical ZVS battery equalizer based on bipolar Buck-Boost converter units will be presented and analyzed in detail.



Faxiang Peng was born in Sichuan, China. He received the B.S. degree in electric engineering and automation from Xian University of Technology (XUT), Xian, China. He is currently working toward the M.S. degree in School of Information Science and Technology, ShanghaiTech University, Shanghai, China. His research interests are the battery management system, battery equalization.

SIST-Seminar 180105