Finite element modeling method for predicting damage behavior of rupture disk in cap structure under thermal runaway of lithium battery

The invention discloses a finite element modeling method for predicting damage behaviors of a rupture disk in a cap structure under thermal runaway of a lithium battery. The finite element modeling method comprises the steps of geometric modeling of the rupture disk, grid division, input of a material elastic model, a plastic model and a damage model, setting of thermal runaway boundary conditions, setting of a calculation model, acquisition of opening pressure of a safety valve and the like. The finite element modeling method for the safety design of the lithium battery safety valve device is repeatable, experiment-free, low in cost and high in precision, and the early-stage test exploration cost of related enterprises is reduced. 本发明公开了一种锂电池热失控下盖帽结构内爆破片损伤行为预测的有限元建模方法，包含了爆破片几何建模、网格划分、材料弹性模型、塑性模型和损伤模型输入、热失控边界条件设置、计算模型设置、安全阀开启压力获取等步骤。本发明可实现具备可重复、免实验、低成本、高精度的锂电池安全阀器件安全设计的有限元建模方法，降低相关企业的前期试验摸索成本。