基于可重构电路的锂电池组充放电均衡器设计

Design of Charge and Discharge Equalizer for Lithium Battery Pack Based onReconfigurable Circuits

针对锂电池组在充放电后锂电池单元能量不一致问题,提出了基于可重构电路的锂电池组充放电均衡电路。在充电阶段,均衡器通过改进的可重构电路控制锂电池组的串并联形式以及锂电池单元的充电状态,实现锂电池组充电均衡;在放电过程中,通过同步Buck电路结合开关管给能量最低的锂电池单元补充能量,实现放电过程中的能量均衡;最后,在MTALAB/Simulink中,对4节锂电池单元组成的电池组进行仿真和均衡验证。结果表明,该均衡器在锂电池组充放电过程中能实现快速均衡,并有效降低电池的不一致程度。

A reconfigurable circuit based lithium battery pack charge and discharge balancing circuit is proposed to address the issue of inconsistent energy in lithium battery cells after charging and discharging.During the charging phase,the equalizer controls the series parallel connection of the lithium battery pack and the charging state of the lithium battery units through an improved reconfigurable circuit,achieving balanced charging of the lithium battery pack.During the discharge process,the lowest energy lithium battery unit is replenished with energy through a synchronous Buck circuit combined with a switching tube to achieve energy balance during the discharge process.Finally,in MTALAB/Simulink,a battery pack consisting of four lithium battery units was simulated and balanced for verification.The results indicate that the equalizer can achieve fast balancing during the charging and discharging process of lithium battery packs and effectively reduce the degree of battery inconsistency.Compared with various algorithms,the feasibility of the improved genetic algorithm in practical applications was demonstrated.