双层相变材料结构的圆柱形锂离子电池相变冷却模块仿真分析

Simulation analysis of the phase change cooling module for cylindrical lithium-ion battery with double-layer phase change material structure

针对锂离子电池在不同环境温度下的散热问题,设计了一种新型的双层相变材料(PCM)结构的电池冷却模块。首先研究了双层结构用于电池热管理的可行性。然后研究了内外层相变材料的热力学性能和布置方式对电池散热的影响。通过仿真分析结果表明,内层使用导热性能好潜热低的相变材料,外层使用导热性能差潜热高的相变材料具有最好的效果,在环境温度达到35℃和40℃时,相比于同尺寸使用单一相变材料的散热模型的最高温度,分别降低了4.34℃、16.67℃,结果表明:双层相变材料结构可用于电池散热,并在一定程度上提高相变材料冷却模块的环境适应性。

Aiming at the heat dissipation problem of lithium-ion batteries at different ambient temperatures, a new type of battery cooling module with a double-layer phase change material(PCM) structure was designed.Firstly, the feasibility of the double-layer structure in battery thermal management was studied.Then the effect of the thermodynamic properties and the arrangement of the inner and outer phase change material on the heat dissipation of the battery was studied.The simulation analysis results showed that the use of phase change material with good thermal conductivity and low latent heat for the inner layer and the phase change material with poor thermal conductivity and high latent heat for the outer layer had the best effect.When the ambient temperature reached 35℃ and 40℃,compared with the heat dissipation model using the single-layer phase change material of the same size, the maximum temperature of the double-layer structurewas reduced by 4.34°C and 16.67°C respectively.The results show that the double-layer phase change material structure can be used for battery heat dissipation, and can improve the environmental adaptability of the phase change material cooling module to a certain extent.