新型动力电池热管理系统设计及性能研究

Design and Performance Study of a New Type of Thermal Management System for Traction Battery

为提高动力电池液冷系统和加热系统的冷却和加热效果与安全性,本文中基于理论分析和数值模拟的方法设计了一种新型冷热集成系统。其中,液冷板采用独立式盘绕铝管嵌入铝材基板结构,并设计了流量分区以适应电池模组差异化的冷却需求,而低温条件下电池模组的快速加热,则通过集成PTC热敏电阻模块来实现。实验结果表明,在环境温度为40℃条件下进行快速充电和大功率放电循环时,电池包4个分区的最高温度均低于45℃,且各分区温差在1℃左右;在环境温度为-20℃时,内部加热方案可快速将电池包温度由-20℃上升至可大电流充电的温度,且其能耗比外部循环加热方式降低41.4%。

In order to enhance the cooling and heating effect and safety of the liquid cooling system and heating system for traction battery,a novel integrated cooling and heating system is designed based on theoretical analysis and numerical simulation. The liquid cooling plate in the system adopts the structure of independent coiled aluminum tube embedded in the aluminum substrate,with four flow subzones designed to suit the discrepant cooling requirements of battery pack and a heating module of thermo-sensitive resistor with positive temperature coefficient is integrated into the system for the rapid heating of battery pack in the condition of low temperature. The results of experiment show that in a cycle of fast charging and high power discharging at an ambient temperature of 40 ℃,the highest temperature of four subzone all lower than 45 ℃,and their temperature difference are all around 1 ℃,and when the ambient temperature falls to-20 ℃,the internal heating scheme can quickly raise the temperature of battery pack from-20 ℃ to the temperature allowing large current charging with an energy consumption 41.4% lower than that with external cycle heating.