基于模糊控制的动力电池组均衡充电控制策略研究

Research of Equalizing Charge Control Strategy for Power Battery Based on Fuzzy Control

摘要:

针对单体电池性能的不一致性导致串联动力电池组性能急剧下降以及使用寿命缩短问题,设计了一种基于储能电感的非耗散型均衡电路；在对动力电池组均衡电路充电过程进行分析的基础上,根据电池组中单体电池的SOC值,采用模糊控制算法对均衡电路切换的占空比进行控制,调节其充电电流,从而实现电池组充电的均衡控制；在恒流工况下,对四节电池串联电池组进行了均衡充电的仿真实验；实验结果表明,设计的均衡电路和模糊均衡控制算法能够实现能量的无损转移,达到均衡充电的要求。

Abstract:

The performance difference of battery cells may lead to the decrease of the total storage capacity and battery life cycle. To solve this problem, a non dissipative equalization circuit based on energy storage inductors is proposed. The charging process of the equalizing circuit is analyzed in detail in this paper. According to the SOC values of the battery cells in the battery pack, the fuzzy control algorithm can control the duty ratio of switching device and tune the charging current, so as to realize rapid equalization charging of the battery pack. The simulation experiment of equalizing charge is made by using charging model of four batteries in series in the constant current conditions. Experimental results show that the designed balance circuit and fuzzy equilibrium controller can realize lossless transfer of energy and achieve the requirement of the equalizing charge.