Lithium batteries have become the main power source for new energy vehicles due to their high energy density and low self-discharge rate. In actual use of series battery packs, due to battery internal resistance, self-discharge rate and other factors, inconsistencies between the individual cells inevitably exist. Such inconsistencies will reduce the energy utilisation rate and service life of the battery pack, and even endanger its battery system safety. To improve the inconsistency of series battery packs, this study innovatively proposes an equalisation method based on a flyback converter. The residual power of a single cell is used as an index of inconsistency. A simple and reliable flyback converter is used to achieve balanced energy in the entire group, which make the energy is transferred between any batteries. Compared with the traditional equalisation topology, the equalisation topology proposed in this study reduces the number of components and reduces the volume of the equalisation system. Moreover, the primary side of the energy transfer only needs a set of control signals, which reduces the control difficulty. A series of equalisation experiments were performed using 12 series of battery cells. The results show the effectiveness of the proposed new equalisation method.

中文翻译：

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基于双向反激转换器的新型锂电池组电压均衡电路

锂电池由于其高能量密度和低自放电率而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，自放电率等因素，不可避免地会出现单个电池之间的不一致。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性。为了改善串联电池组的不一致性，本研究创新地提出了一种基于反激转换器的均衡方法。单个单元的剩余功率用作不一致的指标。一个简单可靠的反激式转换器用于在整个组中实现平衡的能量，从而使能量在任何电池之间传递。与传统的均衡拓扑相比，本研究提出的均衡拓扑减少了组件数量，减小了均衡系统的体积。此外，能量传递的初级侧仅需要一组控制信号，这降低了控制难度。使用12个串联的电池单元进行了一系列均衡实验。结果表明了所提出的新均衡方法的有效性。