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电动汽车动力电池生热模型和散热特性

, PP. 18-24

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Abstract:

结合Bernardi生热速率模型建立了单体电池正极片集流体、负极片集流体和电池极板的热耦合模型以及成组电池传热模型;利用Fluent软件仿真分析了自然通风环境中LiFePO4单体电池的生热特性,模拟了强制空气对流冷却条件下成组电池的生热和散热特性,分析了电池箱出风口位置对电池温度的影响;计算了不同放电倍率下电池组温度变化.计算结果表明动力电池恒流放电末期,正、负极片的电流密度最大值出现在极耳处,正、负极耳温度高于极板温度,且正极耳温度大于负极耳温度;强制冷却条件下成组电池热特性满足安全工作温度要求;电池箱出风口位置直接影响冷却空气速度场和电池组温度场分布,出风口设置在电池箱下部有助于改善其热状态一致性.对特征点温度监控数据与仿真结果的误差小于5%,能够满足工程需要.

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