基于FLUENT方形锂离子电池液冷系统结构优化设计

Optimization Design of Liquid Cooling System Structure Based on FLUENT Square Lithium-Ion Battery

摘要: 动力电池是电动汽车的重要组成部分，直接影响着电动汽车的性能，液体冷却系统是诸多散热方式中比较高效的一种方式，通常实现更高的冷却效率。本文在传统蛇形流道与并行流道的基础上进行改进，设计一种单流道并行冷板和双流道并行冷板，利用Fluent软件仿真技术对比分析在不同结构下电池模组的冷却效果，选定最佳冷却结构。探究在不同入口流速、初始温度下模组的散热效果。结果表明：在入口速度为0.35 m/s时，电池模组温差符合评价标准，且增大入口流速可有效降低电池模组温度，但超过0.5 m/s时散热效果降低。降低冷却液入口温度可以有效降低模组最高温度，但温度低于一定范围，模组温差将逐渐增大。

Abstract: Power battery is an important part of electric vehicles, which directly affects the performance of electric vehicles, and liquid cooling system is one of the more efficient ways to dissipate heat, usually achieving higher cooling efficiency. In this paper, on the basis of the traditional serpentine flow channel and parallel flow channel, a single flow channel parallel cold plate and a double flow channel parallel cold plate are designed, and the cooling effect of the battery module under different structures is compared and analyzed by using Fluent software simulation technology, and the optimal cooling structure is selected. Explore the heat dissipation effect of the module under different inlet flow rates and initial temperatures. The results show that when the inlet velocity is 0.35 m/s, the temperature difference of the battery module meets the evaluation criteria, and increasing the inlet flow rate can effectively reduce the temperature of the battery module, but the heat dissipation effect is reduced when the inlet velocity exceeds 0.5 m/s. Lowering the coolant inlet temperature can effectively reduce the maximum temperature of the module, but if the temperature falls below a certain range, the temperature difference of the module will gradually increase.