基于内聚力模型的动力电池胶粘连接仿真研究

Research on Simulation of Adhesive Connection of Power Battery Based on Cohesive Zone Model

针对动力电池中的胶粘连接,本文开展电池包用结构胶粘接对接接头和拉伸剪切接头的力学性能测试,获取了基于内聚力模型的胶粘界面力学性能参数,并将其应用于电池包准静态挤压分析中,仿真预测挤压过程中结构胶的开裂失效和整包的机械安全性能。对动力电池包开展挤压试验,实测结果与仿真结果基本相符,未发生安全问题。基于内聚力模型模拟结构胶开裂失效,可以为电池包结构高集成和轻量化设计提供技术支撑。

For the adhesive connection in power batteries,this article conducted mechanical performance tests on butt joints and tensile shear joints which used structural adhesive for battery packs.The mechanical performance parameters of the adhesive interface based on the cohesive zone model(CZM)were obtained and applied in the quasi-static squeeze analysis of battery packs.The fi nite element analysis predicted the cracking failure of the structural adhesive and the mechanical safety performance of the battery pack during squeeze process.Subsequently,squeeze test was conducted on the power battery pack,which was consistent with the simulation results and no safety issues occurred.By applying the CZM to simulate the cracking failure of structural adhesive,technical support can be provided for the safety and lightweight design of battery pack structure.