常温柔性复合相变材料电池热管理系统的性能研究

Performance of flexible composite phase change materials for battery thermal management at room temperature

传统定型相变材料由于刚性强导致的易脆化断裂、装配困难、与热源壁面刚性贴合导致接触热阻等问题,严重制约了相变材料在热管理领域的应用。制备热塑性苯乙烯基聚合物(TPS)/石蜡(PA)/碳化硅(SiC)复合相变材料,并对其性能进行了测试与表征。结果表明:常温下(30℃以下)复合材料表现出良好的柔性和机械性能,断裂伸长率可达640.916%。进一步验证TPS/PA/SiC复合相变材料在热管理领域的有效性,将其作为散热介质,设计并搭建相变材料电池热管理系统。40℃下,该电池模组进行2.5 C高倍率放电6个循环后,其最高温度与平均温差均优于以5 m/s风速强制冷却的电池模组,最高温度约55℃,电池模组最大温差为3.15℃。

The application of PCM in the field of thermal management is severely restricted by the problems of brittle fracture,assembly difficulty and thermal resistance caused by rigid fitting with heat source wall.Thermoplastic styrenebased polymer(TPS)/paraffin(PA)/silicon carbide(SiC)composite phase change materials were prepared,and their properties were tested and characterized.The results show that the composites exhibit good flexibility and mechanical properties at room temperature(below 30℃),and the elongation at break can reach 640.916%.To further verify the effectiveness of TPS/PA/SiC composite phase change material in the field of thermal management,use it as a heat dissipation medium to design and build a phase change material battery thermal management system.After 6 cycles of 2.5 C high rate discharge at 40℃,the maximum temperature and average temperature difference of the battery module are better than those of the battery module forced cooling at 5 m/s wind speed.The maximum temperature is about 55℃,and the maximum temperature difference of the battery module is 3.15℃.