A Flyback Converter-based Hybrid Balancing Method for Series-Connected Battery Pack in Electric Vehicles

Xiangwei Guo, Jiahao Geng, Zhen Liu, Xiaozhuo Xu, Wenping Cao

Research output: Contribution to journalArticlepeer-review


An active balancing method based on two flyback converters is proposed for series-connected battery pack. Balanced energy can be transferred between the whole battery and any single cell. The proposed topology reduces the number of energy storage components, the volume and the cost of the balancing system. And it has the characteristics of fast balancing speed and high balancing
efficiency. Based on the topology, a dual-objective hybrid control
strategy is proposed, which can reduce the highest voltage and
boost the lowest voltage in the charging or discharging process of
the cells in one sampling period, so as to improve the balancing
speed. Simulation and experimental results show that the proposed
method has a good balancing effect and can significantly improve
the consistency of series battery pack. This work is potentially
significant in terms of improved reliability of battery packs and
savings of costs and lives in safety-critical applications.
Original languageEnglish
JournalIEEE Transactions on Vehicular Technology
Early online date8 Jun 2021
Publication statusE-pub ahead of print - 8 Jun 2021

Bibliographical note

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Funding: This work was supported in part by the National Natural Science
Foundation of China under Grant 61703145, in part by the key scientific and
technological projects of Henan Province under Grant 202102210093,
212102210248, and in part by the Fundamental Research Funds for the
Universities of Henan Province under Grant NSFRF210332.


  • Active balancing
  • flyback converter
  • series battery pack
  • dual-objective control

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