改进型逻辑门限混合储能系统控制策略研究

针对由启动电池和动力电池构成的电动汽车储能系统，利用启动电池功率密度高的特点与动力电池组结合构成混合储能系统作为负载的供电单元，为避免动力电池组长时间大电流放电和延长动力电池组寿命，设计改进型逻辑门限混合储能控制策略，改善混合储能系统内部能量均衡，并能有效提高储能系统电池使用效率。仿真比较了常规逻辑门限控制策略和改进型逻辑门限控制策略的差异，并进一步通过实验验证改进型逻辑门限控制策略的可行性。结果表明，改进型逻辑门限控制策略能够更好地改善动力电池组输出电流大的问题，并很好地实现了动力电池组和启动电池组的能量均衡。

Control Strategy of Improved Logic Threshold Hybrid Energy Storage System

In the light of the electric vehicle energy storage system composed of start battery and power battery，the hybrid energy storage system which is composed of high power density start battery and power battery is used as power supply unit of load. In order to avoid long-time & large current discharge of power battery group and extend the service life of power battery，improved logic threshold control strategy of hybrid energy storage is designed to improve internal energy equilibrium and the efficiency of battery energy storage system. The difference between conventional logic threshold control strategy and improved logic threshold control strategy is simulated and compared，the feasibility of improved logic threshold control strategy is further verified by experiments. The results show that the improved logic threshold control strategy can better solve the problem of large output current of power battery and achieve the energy balance between power battery and start battery.