基于碳纳米材料协同强化型复合相变材料的动力电池组传热特性

研制了一种基于石墨烯与碳纳米管掺杂的复合相变材料（CPCM），对比分析了高放电倍率下（3C）不同环境温度时基于纯相变材料（PCM）与复合相变材料的锂离子动力电池组的热性能。实验结果表明，当环境温度分别为30℃、35℃和40℃时，由于石墨烯与碳纳米管的协同强化传热，与基于石蜡的电池组相比，电池组的最高温度分别下降了0.6℃、0.8℃和3.8℃。同时也发现，电池组中间位置电池温度高于周边电池，复合相变材料可以降低电池组的温差，尤其在环境温度较高时效果更为明显，如在环境温度为40℃时，填充材料为纯相变材料与复合相变材料时电池组的最大温差为6℃和3.5℃，与采用纯石蜡作冷却介质相比，填充复合相变材料可以使电池组最大温差下降41.7%。

Heat transfer characteristics of power battery pack based on composite phase change material enhanced by synergistic of carbon nano-materials

A composite phase change material(CPCM) doped graphene and carbon nanotubes was prepared. Under high discharge rate (3C), thermal performances of two lithium-ion power battery packs based on pure phase change materials(PCM) and composite phase change material(CPCM) were analyzed and compared at different ambient temperatures. When the ambient temperature was 30℃, 35℃ and 40℃ respectively, experimental results showed that the maximum temperature of battery pack based on CPCM decreased by 0.6℃, 0.8℃ and 3.8℃ compared with the battery pack based on PCM. This was due to the synergistic heat transfer enhancement by graphene and carbon nanotubes. The experimental results also showed that the temperature of batteries in middle position was higher than the surrounding batteries. Temperature difference of battery pack based on CPCM could be reduced compared with battery pack based on PCM. The effect was more obvious when the ambient temperature was high. For example, when the environment temperature was 40℃, the maximum temperature difference of battery pack based on PCM and CPCM were 6℃ and 3.5℃ respectively. The maximum temperature of battery pack based on CPCM could be decreased by 41.7% compared with battery pack based on PCM.