退役动力电池多变量均衡控制策略研究

Research on multivariable equilibrium control strategy of decommissioned power battery

退役动力电池单元不一致性严重影响了电池组的剩余寿命和容量利用率,且对均衡管理系统提出了更高的要求。结合电池的开路电压-荷电状态(OCV-SOC)特性曲线,提出了一种基于电压和SOC的多变量协调均衡控制策略,根据电池组SOC所处的状态,选取电压和SOC的组合权重作为均衡变量。仿真结果表明,多变量协调均衡策略与单一变量均衡策略相比,以相对较快的均衡时间实现了电池电压和SOC更好的均衡效果,满足了退役电池组均衡的实际需求。

The inconsistency of the connection into groups of the retired electric power batteries of electric vehicles seriously affect the remaining life and capacity utilization of the battery pack,and puts forward higher requirements for the balanced management system.Based on the OCV-SOC characteristic curve of the battery,a multi-variable coordinated equilibrium control strategy based on voltage and SOC was proposed.According to the state of the battery pack SOC,the combined weight of voltage and SOC was selected as the equilibrium variable.The simulation results show that the multi-variable coordinated equilibrium strategy achieves a better balancing effect of battery voltage and SOC with a relatively faster balancing time compared to the single-variable balancing strategy,and meets the actual needs of retired battery pack balancing.