基于电池模组重构的均衡充电控制方法

Charging and equalization control method based on reconfiguration of battery module

锂离子电池以高功率密度、高能量密度和低自放电等优势被广泛应用于消费电子和储能等领域。电池在制造和使用过程中的环境差异导致了电池组单体电量不均衡,严重影响电池成组后的整体可充入电量。针对电池组由于电量不均衡而无法实现满充的实际问题,针对7节电池串联构成的电池组,提出了电池重构系统和状态监测系统,实现任意电池单体串联组合,并在此基础上以荷电状态(SOC)为判据进行聚类分组,根据电量整体从低到高的顺序进行梯级充电,最终实现电量不均衡电池组整体同步充满。实验结果表明,该方法与无重构系统的充电方式相比,电池组可用容量提升达55.9%。

Lithium ion batteries are widely used in consumer electronics and energy storage due to the advantages of high power density,high energy density and low self-discharge rate.However,the difference in the process of manufacturing and operation of battery leads to the imbalance of characteristic parameters,which affects the overall chargeable power of battery pack.In view of the fact that the battery pack cannot be fully charged due to the imbalance,a battery reconfiguration system and a condition monitoring system are proposed for the battery pack composed of seven batteries connected in series to realize the connecting and cutting of any cell.On this basis,the state of charge(SOC) is used as the criterion for clustering and grouping,and then the cascade charging is carried out according to the SOC group ordered from low to high.And finally the battery pack is fully charged through reconfiguration.The experimental results show that compared with the charging method without reconfiguration,the available capacity of the battery pack is increased by 55.9%.