以石蜡(PW)为相变材料、膨胀石墨(EG)为导热增强剂和定形材料、铝蜂窝为导热和结构强度增强材料,制备了铝蜂窝增强EG/PW复合材料板。通过X射线衍射仪、红外光谱和差示量热等手段分析了铝蜂窝增强EG/PW复合材料的物相、化学结构和相变行为,测试了导热系数,并对比了PW和铝蜂窝增强EG/PW复合材料对动力锂电池的控温散热效果。结果表明:EG与PW之间未发生化学反应,EG/PW复合材料的相变潜热略低于理论计算值,过冷度变小;其导热系数随EG含量的增加而增大;与PW相比,铝蜂窝增强EG/PW复合材料对动力锂电池具有良好的控温散热效果。
A new kind of aluminum honeycomb-enhanced expanded graphite (EG)/paraffin wax (PW) composite material was prepared for Li-ion battery thermal management,in which PW was chosen as phase change material,EG as the promoter of thermal conductivity and shape-stabilized material,and aluminum honeycomb as the material-enhanced in terms of thermal conductivity and structural strength.The phase and chemical structure,and phase transition behavior of EG/PW were analyzed by XRD,FT-IR and DSC.The thermal conductivity and structural strengthen of composite were measured.The effect of EG/PW on controlling temperature rising of Li-ion battery was investigated.The results showed that:there was no chemical reaction between EG and PW.The phase change latent heat of EG/PW was a little lower than the calculated value based on the mass fraction of PW,and its super-cooling was also decreased in comparison with that of PW.The thermal conductivity of EG/PCM increased with an increase in EG content.Compared to PW,EG/PW composite exhibited outstanding temperature-controlling performance for Li-ion battery.
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基金资助
江西省教育厅科技项目(KJJ170930);国家自然科学基金(51762034)
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