A high-efficiency active cell-to-cell balancing circuit for Lithium-Ion battery modules is proposed in this paper. By transferring the charge directly from the highest voltage cell to the lowest voltage cell using an LLC resonant converter designed to achieve zero-voltage switching (ZVS) and nearly zero-current switching (ZCS) for all of the primary switches and zero-voltage zero-current switching (ZVZCS) for the diodes in the secondary, the proposed topology can achieve a high efficiency and a fast balancing speed with a simple control and design. In order to show the improved performance of the proposed method, a prototype circuit was built with a battery module having twelve Lithium-Ion (Li-Ion) batteries. Experimental results are presented to verify the shorter balancing time and higher efficiency of the proposed method when compared with conventional methods. The measured time for the balancing of the twelve cells was 47 min and a maximum efficiency of 94.5% was achieved at 1.5 W.

中文翻译：

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使用 LLC 谐振转换器的锂离子电池模块的高效有源电池对电池平衡电路

本文提出了一种用于锂离子电池模块的高效有源电池间平衡电路。通过使用 LLC 谐振转换器将电荷直接从最高电压电池转移到最低电压电池，该转换器旨在为所有初级开关和零电压实现零电压开关 (ZVS) 和近零电流开关 (ZCS) -电流开关（ZVZCS）用于次级二极管，所提出的拓扑结构可以通过简单的控制和设计实现高效率和快速平衡速度。为了展示所提出方法的改进性能，使用具有十二个锂离子 (Li-Ion) 电池的电池模块构建了原型电路。实验结果表明，与传统方法相比，所提出的方法具有更短的平衡时间和更高的效率。测量的 12 节电池平衡时间为 47 分钟，在 1.5 W 时实现了 94.5% 的最大效率。