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<p>This paper proposes an active balancing method for series-connected battery packs utilizing a single flyback transformer. The design allows for efficient energy transfer between the entire battery pack and individual cells. By incorporating a single flyback transformer, the system achieves reduced cost and size, while the exclusive use of MOSFETs, without any diodes, enhances its overall efficiency. The method is further improved through a dual-objective hybrid control strategy, which simultaneously reduces the highest cell voltage and increases the lowest cell voltage during charging or discharging within a single sampling period, thus speeding up the balancing process. Simulation and experimental results confirm the effectiveness of the proposed approach, demonstrating enhanced cell consistency, improved reliability, and cost-effectiveness. This method is particularly valuable for applications requiring compact, efficient, and reliable battery management solutions.</p>

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An innovative optimized flyback transformer-based active cell balancing system for enhanced battery management in series-connected battery packs of electric vehicle

  • 期刊论文

  • 发表日期：

    2025年4月21日

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  • Kannan Nithin Kariyankattil Velukutty,
  • Deepa Sundararajan,
  • Muthuraman Ramaiah Krishnappa,
  • Rampriya Boomi Perumal,
  • Sreevardhan Cheerla,
  • Selligoundanur Subramaniyam Sivaraju

摘要

This paper proposes an active balancing method for series-connected battery packs utilizing a single flyback transformer. The design allows for efficient energy transfer between the entire battery pack and individual cells. By incorporating a single flyback transformer, the system achieves reduced cost and size, while the exclusive use of MOSFETs, without any diodes, enhances its overall efficiency. The method is further improved through a dual-objective hybrid control strategy, which simultaneously reduces the highest cell voltage and increases the lowest cell voltage during charging or discharging within a single sampling period, thus speeding up the balancing process. Simulation and experimental results confirm the effectiveness of the proposed approach, demonstrating enhanced cell consistency, improved reliability, and cost-effectiveness. This method is particularly valuable for applications requiring compact, efficient, and reliable battery management solutions.