碳纤维电池包箱体的设计与铺层优化研究

Design and Layering Optimization of Carbon Fiber Battery Package Box

为实现电池包箱体的轻量化设计,采用碳纤维复合材料取代传统金属构建电池包箱体结构。首先对碳纤维电池包的动静态性能开展有限元分析,并基于性能要求对上盖板依次进行形貌优化和尺寸优化,对下箱体进行结构优化,使下箱体质量减轻31.1%,且一阶固有频率提升至50.63 Hz,然后,开展了箱体铺层优化分析,基于Isight平台对下箱体的质量和一阶固有频率进行多目标优化,利用熵-优劣解距离法(TOPSIS)确定最优铺层设计方案,并综合考虑层合板铺覆工艺对铺层顺序进行全面优化,优化分析结果表明,下箱体实现质量减轻58.9%,且各工况下的最大位移和最大应力均有所减小,电池包箱体动静态性能均得到提升。

Carbon Fiber Reinforced Plastic(CFRP)were used to replace traditional metals to construct battery pack box to achieve lightweight design of battery pack box.Firstly,based on performance requirements,finite element analysis was conducted for the dynamic and static performance of carbon fiber battery pack,topography and size optimization was carried out on the upper cover plate,and structural optimization was made on the lower box body respectively,which increased the firstorder natural frequency to 50.63 Hz and reduced weight of the lower box by 31.1%.Secondly,optimization analysis was made on the box layer,and based on the Isight platform,multi-objective optimization was conducted on the weight and first-order natural frequency of the lower box,meanwhile the entropy TOPSIS decision-making method was used to determine the optimal layer design scheme.Finally,the layer sequence was optimized by considering the lamination board laying process.The optimization analysis results show that lower box achieves a weight reduction of 58.9%,and both the maximum displacement and maximum stress under all operating conditions were reduced,and the dynamic and static performance of the battery pack box has been improved.