锂电池能量管理系统优化与策略研究

Research on Optimization and Strategy of Lithium Battery Energy Management System

由于锂电池的内阻等参数存在差异,需要对每个电池均衡管理才能发挥整个电池组的最佳性能。常用的均衡管理系统是基于电压的串联电池均衡管理,充电时间长,并且没有对并联电池之间的循环电流进行有效管理。针对充电时间和循环电流,设计基于SOC的串联电池主动均衡的拓扑结构、分组控制策略系统,以及并联电池有序放电策略系统。以4节电池串联构成的电池组进行均衡仿真实验,结果表明该系统的均衡时间比常用的均衡系统所用时间减少31.5%,证明设计的均衡系统和控制策略有效。并联电池有序放电策略系统减少了并联电池间的循环电流,因此在充电电压、电流基本一致时,消耗能源与时间成正比,该系统节约能耗大于31.5%。

Due to the differences of internal resistance and other parameters of lithium batteries,it is necessary to manage each battery in a balanced way in order to give full play to the best performance of the whole battery pack.The commonly used balance management system is based on voltage series battery balance management,charging time is long,and there is no effective management of circulating current between parallel batteries.According to the charging time and circulating current,the topology of series battery active equalization based on SOC,the grouping control strategy system and the orderly discharge strategy system of parallel battery are designed.The equalization simulation experiment is carried out with a battery pack composed of four batteries in series.The results show that the equalization time of this system is 31.5%less than that of the common equalization system,which proves that the equalization system and control strategy designed in this paper are effective.The orderly discharge strategy system reduces the circulating current between parallel batteries.Therefore,when the charging voltage and current are basically the same,the energy consumption is proportional to the time,and the energy consumption of the system is more than 31.5%.