基于单端反激电路双层开关臂双向均衡拓扑

Bidirectional Balanced Topology of Double-layer Switching Arm Based on Single-ended Flyback Circuit

针对电动汽车串联锂离子电池组多次充放电后导致的电量不一致问题,提出一种能够快速有效的实现锂电池组均衡的方法。该均衡方案采用改进的单端反激电路为主电路,以双层开关臂作为选通单体电池的通道,在电池组充电时能够转移电压最高的单体能量,在电池组放电时能够补充电压最低的单体能量,最终实现整个电池组充放电的自由均衡。文章对均衡拓扑结构和原理进行了分析,提出相应的均衡策略,并通过搭建simulink仿真实验证明了该方法的可行性。

Aiming at the inconsistency due to multiple charge and discharge of lithium-ion battery packs in electric vehicles,a method for realizing the balance of lithium battery packs quickly and effectively is proposed.The equalization scheme uses an improved single-ended flyback circuit as the main circuit.The double-layer switching arm is used as a channel for strobing a single battery.It can transmit the highest single energy saving when the battery pack is charged,and can be supplemented when the battery pack is discharged.The lowest cell energy ultimately achieves a free balance of battery charging and discharging.The equilibrium topology and principle are analyzed,and a corresponding equilibrium strategy is proposed.The feasibility of the method is proved by constructing simulink simulation experiments.