低温环境下纯电动汽车动力电池热管理方法.pdf

10.16638/ki.1671-7988.2023.06.003 低温环境下纯电动汽车动力电池热管理方法 李冠中，李琛研 上海工程技术大学 机械与汽车工程学院，上海 201620 ） 摘要：纯电动汽车动力电池在低温环境下会出现工作效率急剧下降的问题，文章针对该问题 设计了相应的热管理方案。低温环境下，在电动汽车电机开始工作之前，采用带反馈调节功 能的正温度系数（PTC ）加热系统进行汽车动力电池预加热。通过四通阀将冷却液的电池与 电机回路相通，构成了新的循环回路。电机开始运转之后，比较低温下PTC 加热系统、电机 余热分别对电池进行加热，与二者协同作用下电池温度的变化情况，发现 PTC ＋驱动系统余 热加热模式加热效率高，能量消耗少，因此，提出低温热管理方法，通过冷却液循环系统利 用PTC 加热系统与电机产生的热量对电池进行加热或保温。 弥补纯电动汽车单一能源的不 足，以上热管理方法的能量来源于 电池-超级电容混 储能系统，保证电动汽车 电池的电 量不会因热管理系统的消耗而大打折扣。 关键词：纯电动汽车；电池热管理；超级电容；正温度系统加热 中图分类号：U469.72 文献标识码：A 文章编号：1671-7988(2023)06- 10-07 Thermal Management Method of Pure Electric Vehicle Power Battery in Low Temperature Environment LI Guanzhong, LI Chenyan ( School of Mechanical and Automotive Engineering, Shanghai University of Engineering Science, Shanghai 201620, China ) Abstract: Pure electric vehicle power batteries will have a sharp decline in working efficiency in low temperature environment. This paper designs a corresponding thermal management scheme for this problem. In low temperature environment, positive temperature coefficient (PTC) heating system with feedback regulation function is used to preheat the automobile power battery before the electric vehicle motor starts to work . The four-way valve connects the battery of the cooling fluid with the motor circuit to form a new circulation circuit. After the motor starts running, comparing the change of battery temperature under the synergistic action of PTC heating system and motor residual heat under low temperature, it is found that the PTC+drive system residual heat heating mode has high heating efficiency and low energy consumption. Therefore, a low temperature