考虑电池热管理的复合电源电动汽车功率分配控制策略

为提升高温环境下电源系统的综合效率,通过分析电动汽车热管理和能耗模型,提出一种考虑电池热管理的复合电源电动汽车功率分配控制策略,并在CATC、NEDC工况下分别与单一电源电动汽车和采用常规策略的复合电源电动汽车进行对比仿真。结果表明,相对于单一电源,采用复合电源方案的电动汽车电源系统能量回馈提升3.6%以上,综合能耗降低3.3%以上,电池最终温度下降3.51℃以上;相对于采用常规策略的复合电源电动汽车,考虑电池热管理的复合电源功率分配控制策略提升超级电容参与度,使复合电源系统能量回馈提升1.8%左右,综合能耗降低1.2%左右,电池最终温度降低1.25℃左右,从而验证了该策略的有效性。

Research on Improvement of Battery Thermal Management Performance Using Composite Power Supply for Electric Vehicles

To improve comprehensive efficiency of the power system in high-temperature environments, a power distribution strategy for hybrid electric vehicles was proposed considering battery thermal management. The thermal management in an electric vehicle and the EV energy consumption model were analyzed.The simulation was conducted, taking into consideration the single power supply, the composite power supply and the power distribution strategy under CATC and NEDC conditions. The results show that compared with the single power supply, the energy recovery of the composite power supply is increased by more than3.6%, the energy consumption is reduced by more than 3.3% and the final battery temperature is decreased by more than 3.51℃. Compared with the conventional strategy, the power distribution strategy considering the battery thermal management increases the energy recovery of the power system by about 1.8% by improving the ultra-capacitor performance, reduces the energy consumption by about 1.2% and reduces the final temperature of the battery by about 1.25℃. The proposed strategy has been proved an effective way to improve the battery thermal management performance in high temperature environments and to enhance the efficiency of composite power supply.