摘要：为降低车载动力电池质量，优化设计2种电池包结构方案，综合运用有限元仿真、约束模态和静力学分析对电池包模型进行计算。结果表明：与原模型相比，方案一电池包质量减少8%，但1阶模态频率降低8 Hz；方案二电池包质量减少6%，1阶模态频率增加1 Hz，急转弯工况下最大应力减少17.66 MPa，最大变形减少0192 mm；方案二更有利于增加电池包的使用寿命。本研究可为电池包结构轻量化改进提供指导思路。
Abstract：In order to reduce the quality of onboard power battery, two kinds of battery pack structure schemes are optimized. The battery pack model is calculated by finite element simulation, constrained modal analysis and static mechanical analysis. The results show that compared with the original pack, the overall weight reduction ratio of the battery packed in the first scheme is 8%, and the firstorder frequency is reduced by 8 Hz. In scheme 2, the overall weight reduction ratio of the battery packed is 6%, the firstorder frequency is increased by 1 Hz,the maximum stress in the ultimate condition is reduced by 17.66 MPa,and the maximum deformation is reduced by 0.192 mm . Scheme 2 is more beneficial to increase the life of the battery pack. The research can provide guidance for the improvement of battery pack structure lightweight.
Keywords:power battery pack; finite element analysis; mode; structure optimization