锂电池组均衡充放电控制策略研究
Study on Control Strategy of Charge and Discharge for Lithium Battery Series

以电动汽车串联使用的锂电池组为研究对象，分析了电池组充放电过程中不一致性问题，综合电池模型原理和适用场合，选用二阶Thevenin等效电路模型搭建电池模型，运用曲线拟合的方法对电池模型参数辨识。设计了基于DC-DC变换器的外电压均衡控制策略原理，搭建仿真电路验证均衡电路性能。仿真结果表明，基于DC-DC变换器的外电压均衡控制策略可以很好地改善串联电池组充电和放电过程中的不一致问题。
This paper use series lithium battery series of the electric vehicles as research object. Analyzed the consistency charging and discharging process of the battery. The battery model is using second-order Thevenin circuit based on the principle of battery model and application of occasions. Carried on the parameters identification using the curve fitting method, completed the battery model verification. After that, the external voltage equalization based on the DC-DC converter is used to build the simulation circuit to verify the performance of the equalization circuit. The simulation results show that the control strategy can improve the series battery charging and discharging process