摘要
为分析泡沫铜/石蜡复合相变材料的车用动力锂电池散热问题,建立了电池生热模型,给出了该复合相变材料在不同孔隙率下的热物性参数值,利用有限元法分析了材料包覆方式、材料厚度、对流换热系数、环境温度等对电池温度的影响。结果表明,四面包覆和双面包覆的复合相变材料比无相变材料的电池温度分别降低了10.36℃和12.56℃,冷却效果明显;增加材料厚度和对流换热系数以及降低周围环境温度,电池温度将降低;当电池表面温度处于相变材料的相变温度区间时,继续增加材料厚度和对流换热系数散热效果不显著;复合相变材料用量不充足时,相变潜热占主导作用,增加孔隙率将使电池温度先增大后减小。
In order to analyze heat dissipation of vehicle power Li-ion battery with eopper foam/paraffin wax, a battery heat generation model was established, which gave thermophysieal properties of this composite Phase Change Material （PCM） under different porosities, and FE method was used to analyze the influence of faetors ineluding material packing method, material thickness, convective heat transfer coefficient on battery temperature. Results showed that the battery temperature with two-side packed and four-side packaged composite PCM are reduced by 10.36 and 12.56 ~C respectively, compared with battery without PCM, so the cooling effect is obvious. In addition, battery＇s temperature will decrease if the material thickness or convective heat transfer coefficient increases, and ambient environmental temperature decreases. When the battery surface temperature is in the phase change temperature range, the cooling effect is not obvious by continuing increasing material thickness and convective heat transfer coefficient. Moreover, when the dosage of composite PCM is not enough, battery temperature increases first and then decreases with increase of porosity, when the phase change latent heat plays a dominant role.
出处
《汽车技术》
CSCD
北大核心
2017年第1期43-47,共5页
Automobile Technology
基金
广东省青年创新人才类项目(自然科学类)(2015KQNCX190)
广东科技学院自然科学类重点科研项目(GKY-2016KYYB-2)
关键词
动力锂电池
复合相变材料
热性能
Li-ion battery, Composite phase change material, Thermal performance
