In order to reduce the maximum temperature of the battery module and to improve the uniformity of its tem-perature distribution,the 18650 lithium-ion battery modules arranged at 4×8 equidistant intervals was calculated under the three different heat dissipation structures and sizes of the battery module in circular inlet,and circular,semicircular and rectangular outlet with ANSYS Fluent software. The results showed that the maximum temperature and tempera-ture variation coefficient of the heat dissipation structure of the rectangular air outlet are smaller than those of the circu-lar and semi-circular air outlet in the same working conditions. When the inlet wind speed is 1~3m/s and the rectan-gular outlet is 40mm×50mm,the maximum temperature and the temperature variation coefficient of the battery module are the smallest. And,when the inlet wind speed is more than 3m/s and the rectangular outlet is 40mm×70mm,these two parameters of the battery module are the minimum.%为了降低车用动力电池模组的最高温度、提高其温度分布一致性,以4×8等间距排列18650锂离子电池模组为分析对象,运用ANSYS Fluent软件对圆形进风口,圆形、半圆形及矩形出风口三种不同散热结构及尺寸电池模组温度场进行了计算.结果表明:矩形出风口散热结构电池模组的最高温度和温度变异系数比相同工况下圆形与半圆形出风口散热结构都小.当进口风速为1~3m/s,矩形出风口为40mm×50mm时,电池模组的最高温度和温度变异系数最小;当进口风速>3m/s、矩形出风口为40mm×70mm时,电池模组的最高温度和温度变异系数最小.
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