Lithium battery has become the main power source of new energy vehicles due to its high energy density and low self-discharge rate. In the actual use of the series battery pack, due to the internal resistance and self-discharge rate of batteries and other factors, inconsistencies between the individual cells are unavoidable. Such inconsistencies will reduce the energy utilisation rate and service life of the battery pack, and even endanger the safety of the battery systems. To improve the consistency of the series battery pack, a novel balancing method based on the flyback converter is proposed in this study. The flyback converter with a simple and reliable structure is used to realise the energy transfer between the whole battery pack and any single cell. Compared with the traditional balancing topology, the topology proposed in this study reduces the number of components and the volume of the balancing system, and only needs one set of control signals on the converter primary side, thus reducing the control difficulty. The experimental results show the effectiveness of the novel balancing method.

中文翻译：

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基于反激转换器的串联电池组主动平衡方法

锂电池具有高能量密度和低自放电率，已成为新能源汽车的主要动力来源。在串联电池组的实际使用中，由于电池的内阻和自放电率等因素，不可避免地会出现单个电池单元之间的不一致。这种不一致会降低电池组的能量利用率和使用寿命，甚至危及电池系统的安全。为了提高串联电池组的一致性，提出了一种基于反激式转换器的新型平衡方法。具有简单可靠结构的反激式转换器用于实现整个电池组与任何单个电池之间的能量传输。与传统的平衡拓扑相比，本研究提出的拓扑结构减少了平衡系统的组件数量和体积，并且仅在转换器一次侧需要一组控制信号，从而降低了控制难度。实验结果表明了该新型平衡方法的有效性。