动力电池微细通道散热数值分析研究

Numerical analysis of mini-channel heat dissipation in power battery

动力电池对温度敏感度高,高温散热实现难度较大,尤其是极端环境温度和高倍率放电下。设计了一个微细通道电池液冷散热系统,针对系统进行不同放置方式、环境温度、冷却液入口温度、入口流速的影响研究。发现竖直方式电池组可获得较好的温度分布;环境温度变化对电池组温度变化影响较小;电池组温度与冷却液入口温度基本呈线性变化,冷却液入口流速增加可显著降低电池组最高温度,提高温度均匀性。最后对流道进行尺寸优化,增大高度是较好的优化方案。

Because of its high sensitivity to temperature,it is difficult for power battery to dissipate heat at the environment of high temperature,especially under extreme ambient temperature and high rate discharge.A mini-channel battery liquid cooling system was designed.The effects of different placement modes,ambient temperature,coolant inlet temperature and coolant inlet velocity on the system were studied.It is found that the temperature distribution of the vertical battery pack is better than horizontal mode.The change of ambient temperature has little effect on the temperature change of battery pack.The temperature of the battery pack linearly changes with the inlet temperature of the coolant.The maximum temperature of the battery pack is decreased and the uniformity of the temperature is improved by increasing the inlet velocity of the coolant.Finally,it is a better optimization scheme to increase the height of the channel.