【摘要】 为改善电动汽车动力电池的工作温度,设计了基于相变材料的被动式动力电池热管理系统,建立三维电池热模型。通过数值模拟方法,研究不同混合比例下的膨胀石墨/石蜡复合材料热物性参数(导热系数、相变潜热、比热容等)对电池热管理系统性能的影响。结果表明:相变冷却可以有效降低放电过程中电池的最高温度。相同体积下,膨胀石墨质量分数为5%～10%时,膨胀石墨/石蜡复合材料的储热性能最佳:可使电池在1 C放电/环境温度25℃工况、1 C放电/环境温度35℃工况、2 C放电/环境温度25℃工况下,电池最大温差控制在1.07、1.30、3.42℃,电池最高温度控制在38.4、41.3、46.1℃,与无相变材料冷却相比分别下降1.78、9.18、6.73℃。更多还原

【Abstract】 In order to improve the working temperature of batteries,this paper designed a passive battery thermal management system based on phase change materials and a three-dimensional battery thermal model.The effects of thermal physical properties of expanded graphite/paraffin composites on battery thermal management systems were investigated by numerical simulation.The results show that phase change cooling can effectively reduce the maximum temperature of batteries.When the mass fraction of expanded graphite is 5%-10%,the heat storage performance of expanded graphite/paraffin composite is the best under the same volume:In the 1 C discharge/ambient temperature 25 ℃ conditions,1 C discharge/ambient temperature 35 ℃ conditions and 2 C discharge/ambient temperature 25 ℃ conditions,the maximum temperature of the batteries module is controlled at 38.4,41.3,46.1 ℃;compared with non-phase-change material cooling,the reduction is 1.78,9.18,6.73 ℃,respectively.And the maximum temperature difference of the batteries is controlled at 1.07,1.30,3.42 ℃.更多还原