MODULAR LITHIUM-ION BATTERY EQUALIZER BASED ON PHASE-SHIFT STRATEGY

Jin Wei; Wu Yunya; Liu Aizhong; Kan Jiarong; Ding Hang; Zheng Yang

doi:10.19912/j.0254-0096.tynxb.2024-1889

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Acta Energiae Solaris Sinica ›› 2026, Vol. 47 ›› Issue (2) : 726-734. DOI: 10.19912/j.0254-0096.tynxb.2024-1889

MODULAR LITHIUM-ION BATTERY EQUALIZER BASED ON PHASE-SHIFT STRATEGY

Jin Wei¹, Wu Yunya¹, Liu Aizhong², Kan Jiarong¹, Ding Hang¹, Zheng Yang¹

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Abstract

Aiming at the problems of long energy transfer path, low equalization efficiency and weak modularity of conventional battery equalizer in the process of equalizing multiple battery packs, this paper proposes a modular lithium battery equalizer based on half-bridge. The equalizer is modularized by combining a half-bridge equalization circuit and a multi-winding transformer, and the introduction of phase-shift control makes the voltage between each battery cell realize rapid equalization. Firstly, the working principle of the proposed equalizer is analyzed, and the key factors affecting the energy transfer of battery cells within and between equalizer modules are derived. Secondly, the effects of different shift ratios on the active power of the equalizer are revealed through theoretical analysis. Finally, a simulation model and an experimental platform are constructed, and the equalization experiments are conducted on two groups of eight series-connected lithium batteries. The simulation and experimental data verify the developed equalizer outperforms conventional methods in balancing speed, efficiency and scalability.

Key words

lithium-ion batterie / energy storage / half-bridge / equalizer / modularization / phase shift control

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Jin Wei, Wu Yunya, Liu Aizhong, Kan Jiarong, Ding Hang, Zheng Yang. MODULAR LITHIUM-ION BATTERY EQUALIZER BASED ON PHASE-SHIFT STRATEGY[J]. Acta Energiae Solaris Sinica. 2026, 47(2): 726-734 https://doi.org/10.19912/j.0254-0096.tynxb.2024-1889

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