Abstract: Aiming at the differences in front engine room layout between pure electric and fuel vehicles, a front engine room combination bracket assembly suitable for pure electric vehicle front engine room layout scheme is designed, a mechanical model is established, and computer aided engineering (CAE) analysis is carried out to optimize the combination bracket assembly through material and structural improvements. The results show that under the same layout scheme, the performance of the steel composite bracket assembly is difficult to meet the performance requirements. After material and structural optimization, the aluminum composite bracket assembly can better meet the performance requirements. Compared to the steel composite bracket assembly, the aluminum composite bracket assembly can achieve a weight reduction of about 2.06 kg, with a weight reduction rate of 44.2%, and a significant lightweight effect. Excluding costs such as molds, tooling, and fixtures, the cost of parts is reduced by approximately 3.36 yuan per piece. It has mass production conditions and provides a good typical case for the lightweight design of composite bracket assemblies for pure electric vehicle models.

Key words: battery electric vehicle; combination bracket assembly; CAE; lightweight

摘要： 针对纯电车型与燃油车型前机舱布置差异，设计出一种适用于纯电车型前舱布置方案 的前舱组合支架总成，建立力学模型，并进行计算机辅助工程（CAE）分析，通过对材料、 结构改进对组合支架总成进行优化。结果表明，在相同布置方案的前提下，钢制组合支架总 成的性能难以满足性能需求，经过材料、结构的优化，铝制组合支架总成可以更好地满足性 能需求；相对于钢制组合支架总成，铝制组合支架总成可以实现减重约 2.06 kg，减重率为 44.2%，轻量化效果明显。不考虑模具、工装、夹具等费用，零件成本减少约 3.36 元/件，具 有量产条件，为纯电车型组合支架总成的轻量化设计提供了一个好的典型案例。

关键词: 纯电汽车；组合支架总成；CAE；轻量化