动力电池测试用高低温试验箱温度场分析与流场模拟优化

Temperature Field Analysis and Simulation and Optimization of Flow Field in High-low Temperature Test Chamber

以试验区置有两个动力电池的294 L高低温试验箱作为研究对象,通过CFD模拟了高低温试验箱恒温45℃时箱内电池的温升和散热情况,并对高低温试验箱的流场进行优化。结果表明:对于同侧上送风下回风的气流组织形式,在试验区上部放置多孔板进行孔板送风有助于提高流场均匀性;两个动力电池之间会出现涡旋现象,通过增加置物架与内箱底部的间距、适当增大回风口截面积均能减轻甚至消除涡旋现象,提高流场均匀性,当置物架与内箱底部的间距增至0.2 m,回风截面的高度增至0.15 m后,试验箱流场的整体不均匀度由1.73降至0.4,电池间的涡旋现象消失。

In this study,a 294 L high-low temperature test chamber with two power batteries in the test area is investigated.The temperature rise and heat dissipation of the batteries in the chamber at a constant temperature of 45℃are simulated through CFD,and the flow field of the high-low temperature test chamber is analyzed and optimized.The results show that for the air distribution pattern on the same side as the upper air supply and lower air return,the perforated plate in the upper part of the test area is helpful in improving the uniformity of the flow field.A vortex phenomenon occurs between the two power batteries.Increasing the distance between the shelf and bottom of the test chamber and appropriately increasing the return air grille area can reduce or even eliminate this phenomenon and thereby improve the flow field uniformity.When the distance between the shelf and bottom of the inner chamber increases to 0.2 m and the height of the return air grille increases to 0.15 m,the overall inhomogeneity of the flow field in the test chamber decreases from 1.73 to 0.4,and the vortex phenomenon between the batteries disappears.