基于SOC估算的锂电池组复合型均衡拓扑设计

锂电池的均衡管理可以提高锂电池的使用寿命和续航里程。针对磷酸铁锂电池串联电池组中,电池组中各个单体电池之间存在电量不一致的问题,提出一种复合式均衡拓扑结构,通过对单体电池之间的电感或电池组间的变压器选择性放电均衡,实现电池组内的各个单体电池的电量均衡,并测量实际的锂电池放电曲线,拟合锂电池开路电压与SOC的曲线。此外,建立了对应的磷酸铁锂电池Simulink模型,使用SOC估算值作为判断均衡的条件,以提高启动或停止均衡子电路的准确性。在Matlab/Simulink的软件仿真下证明,所提出的复合式均衡方案均衡效果良好,易于实现,控制简易。

Balanced Topology Design of Lithium Battery Complex Based on SOC Estimation

Lithium battery equalization management can improve the service life of the lithium battery and range,in view of the lithium iron phosphate battery series battery,the battery pack in between each monomer battery charge inconsistent problems,put forward a kind of complex equilibrium topology structure,based on the single cells between the inductor or transformer selectivity between the battery discharge balance,realize the balance of each monomer battery power battery pack,and measure the actual battery discharge curve,fitting the curve of the lithium battery open circuit voltage and SOC,and establish the corresponding Simulink model of lithium iron phosphate battery,use SOC estimation values as a balanced condition. It can improve the accuracy of starting or stopping equalizer sub-circuit.It is proved by Matlab/Simulink software simulation that the proposed complex equalization scheme has good equalization effect,easy to realize and easy to control.