Abstract: This paper designs and simulates the thermal management system of the power battery for a certain plug-in hybrid electric vehicle. The liquid cooling plate and cooling channels are designed around the ternary lithium battery pack, and a 50% ethylene glycol water solution is selected as the coolant. A thermal model is established to analyze the thermal characteristics of the battery pack, and the boundary conditions and meshing scheme are determined. Through simulation analysis, the structure is improved, and a liquid cooling thermal management system with double cooling channels and the inlet and outlet on the same side, with a coolant flow rate of 0.14 m/s is designed. At this time, the maximum temperature of the battery pack in the liquid cooling thermal management system is 29.83 ℃, and the temperature difference is 3.53 ℃, which is 5.36% lower than the maximum temperature before the overall system improvement and 39.35% lower than the temperature difference. The cooling effect is relatively good. This scheme can provide a certain reference for the design of the liquid cooling thermal management system of power batteries.

Key words: power battery; thermal management; liquid cooling; simulation analysis

摘要： 文章针对某款插电式混合动力汽车的动力电池热管理系统进行设计与仿真，围绕其三 元锂电池组设计液冷板和冷却流道，并选取 50%的乙二醇水溶液作为冷却液，建立热模型来 分析电池组的热特性，并确定边界条件和网格划分方案。通过仿真分析进行结构改进，设计 了双冷却流道且出入口分布在同侧、冷却液流速为 0.14 m/s 的液冷式热管理系统，此时液冷 式热管理系统电池组的最高温度为 29.83 ℃，温差为 3.53 ℃，比系统整体改进前最高温度降 低了 5.36%，温差降低了 39.35%，冷却效果较佳。此方案可为动力电池液冷式热管理系统的 设计提供一定参考。

关键词: 动力电池；热管理；液冷；仿真分析