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中文摘要：
针对纯电动汽车在放电过程中发热严重的问题,对不同放电倍率下电池的发热情况进行探究.建立一个准确的电池发热模型.首先进行不同温度下的内阻试验,采用密集的温度区间进行试验,探究不同温度对电池内阻的影响,验证了电池内阻随温度变化的规律,然后通过CATIA建立单体电池3维模型,导入到ICEM中划分网格,在网格质量达到标准的前提下,最后通过FLUENT软件对锂电池进行热流场的分析,分别模拟不同放电倍率下电池发热情况,并进行试验验证.结果表明：放电倍率对电池的温升影响很大,大放电倍率下的电池温升更快,温度更高.
英文摘要：
To solve the problem of serious heat generating during the discharge of electric vehicle,the heating conditions of battery with different discharge rates were investigated. An accurate model of the battery heating was established. The internal resistance experiments were conducted at different temperatures using dense temperature range. The influence of temperature on internal resistance of battery was discussed to verify the changing regularity of battery internal resistance with temperature. The threedimensional model of single battery was established by CATIA and imported into ICEM to divide the mesh. Under the premise of grid quality,the thermal field of lithium battery was analyzed by FLUENT software. The battery heating conditions were simulated for different discharge rates and verified by experiment. The results show that the discharge rate has great influence on temperature rise of battery,and the battery temperature is rised faster and higher at high discharge rate.
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