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 simultaneously, 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.
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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
- Buck converters
- Flyback transformers
- dual-objective control
- flyback converter
- series battery pack