动力电池方形铝壳变薄拉深数值模拟

选取某方形锂电池铝壳为研究对象,基于冲压成形Dynaform软件开展变薄拉深成形工艺有限元数值模拟。首先,对板料进行3个方向的静态拉伸实验,获取材料的应力-应变曲线和3个方向的各向异性系数;其次,对板料进行极限减薄率实验,获取材料的最大减薄率;然后,基于Dynaform软件进行有限元建模,板料采用三维实体单元进行模拟,采用动态显式非线性有限元分析软件LS-DYNA进行求解;最后,在Dynaform软件中分析计算结果。结果表明,变薄拉深模拟结果在形貌、厚度、高度、成形性等方面与实验结果吻合较好,验证了变薄拉深模拟方法的有效性,为锂电池铝壳的薄壁化提供了重要的虚拟预报和轻量化设计支持。

Numerical simulation on ironing of square aluminium case for power battery

For the aluminum case of square lithium battery,the finite element numerical simulation of ironing was conducted by the stamping forming software Dynaform. Firstly,the static tensile tests of sheet metal under three directions were carried out,and the stress-strain curves and the anisotropy coefficients under three directions of material were obtained. Secondly,the ultimate thinning rate test of sheet metal was carried out,and the maximum thinning rate of material was obtained. Then,the finite element model was established based on software Dynaform,and the sheet metal was simulated by 3 D solid element. Furthermore,the problem was solved by dynamic explicit nonlinear finite element analysis software LS-DYNA. Finally,the calculation results were analyzed by software Dynaform. The results show that the simulation results of ironing are in good agreement with the actual products in morphology,thickness,height and formability,and the validity of ironing simulation method is verified to provide an important virtual prediction and lightweight design support for thin-walled aluminium case of lithium battery.