An active bidirectional balancer with power distribution control strategy based on state of charge for Lithium-ion battery pack

Yi-Feng Luo, Guan-Jhu Chen, Chun-Liang Liu, Ya-Shuo Chen and Hua-Sheng Hsieh

Applied Energy, 2025, vol. 377, issue PD, No S0306261924020440

Abstract: Promotion green energy has driven the development of energy storage systems (ESS) and electric vehicles (EVs), both of which can significantly reduce environmental pollution. However, the use of multiple battery cells within a battery pack can lead to imbalances, resulting in uneven capacity or voltage among the cells. To mitigate this issue, battery balancers are necessary to maintain equilibrium among the cells in a battery pack. This paper presents the development of four sets of bidirectional buck-boost DC-DC converters that activate a balancing mechanism when the capacity difference exceeds a certain threshold. The balancing mechanism is based on the state of charge (SOC), ensuring that load power is effectively distributed during discharge and that charging current is distributed during charging.

Keywords: Energy storage system (ESS); Electric vehicles (EVs); Balancing mechanism; Bidirectional Buck-boost DC-DC converter; State of charge (SOC) (search for similar items in EconPapers)
Date: 2025
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DOI: 10.1016/j.apenergy.2024.124661

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