Abstract: In this paper, the definition, basic principle, characteristics and future development trend of rolling process are systematically expounded. Through the application of servo control and automation technology, rolling process can realize intelligent flexible production mode. The structural advantages and disadvantages of aluminum box and steel box battery pack are analyzed and compared, and the stamping process and roll process are also compared, and a new technical scheme of steel box and roll process is proposed. Compared with aluminum alloy welded molding boxes, steel roller housing battery packs have significant advantages in terms of cost control and structural strength. From the perspective of design process, this paper discusses in detail the design formulation process from force analysis, manufacturing feasibility study, collision simulation analysis, sample collision test, optimization and improvement to verification and verification. At the same time, in the working condition analysis, the reliability of the design scheme is ensured through the comprehensive simulation analysis of the force load of the product in the three axes. The steel box scheme in this paper successfully solves the problems of welding deformation and poor sealing performance of aluminum alloy box. Through simulation analysis and practical test, it is proved that the steel box battery pack fully meets the design requirements.steel case of battery pack could meets the design requirements.