动力电池导热胶涂覆方式模拟与试验研究

Simulation&Experimental Study on Thermal Conductive Adhesive Coverage Method for Power Battery

以动力电池热管理关键部件导热胶为研究对象,使用仿真软件Fluent建立动力电池仿真模型,对导热胶涂覆面积(85%~95%)进行仿真计算,采用台架试验研究用户典型工况下导热胶对动力电池温度场分布及温度一致性的影响,为热管理方案设计阶段导热胶选型及用量等提供依据。结果表明:随着导热胶涂覆面积从95%降低到85%、电池最高温度从47.87℃上升到50.84℃、上表面最大温差从2.40℃上升到5.87℃,考虑到动力电池设计指标,最终确定使用90%涂覆面积的导热胶能够满足动力电池在3种严苛工况下的最高温度及温差的设计要求,避免在实际生产中导热胶用量过多导致原材料浪费,实现成本节约。

The thermal conductivity adhesive,a key component of thermal management of power battery,was taken as the research object,and the simulation model of power battery was established by using simulation software Fluent.The coating area(85%~95%)of the thermal conductivity adhesive was simulated and calculated,and the influence of the use of thermal conductivity adhesive on the temperature field distribution and temperature consistency of power battery under typical working conditions was studied by bench test.It provides the basis for the selection and dosage of thermal conductivity adhesive in the design stage of thermal management scheme.The results show that as the coating area of the thermal conductivity adhesive decreases from 95%to 85%,the maximum temperature of the battery increases from 47.87℃to 50.84℃,and the maximum temperature difference of the upper surface increases from 2.40℃to 5.87℃.Considering the design criterion of power battery,it is determined that the use of 90%of the coating area of thermal conductivity adhesive can meet the design requirements of the highest temperature and temperature difference under three harsh working conditions of the power battery,avoiding the waste of raw materials caused by excessive heat conductivity adhesive in actual production,and achieving cost savings.