Abstract:

To enhance the passenger space and safety performance of electric vehicles， Cell to Body （CTB） technology is used to integrate batteries as structural components into the bottom of the vehicle body， which not only reduces the number of body components and connectors， but also helps to achieve the lightweight and range requirements of electric vehicles. Addressing potential collision safety issues and the risk of interrupted force transfer paths associated with the CTB structure， in this paper a frontal collision safety design process for vehicle bodies based on the CTB structure is proposed. The design method of "force decomposition-simulation analysis-test benchmarking" is adopted. Firstly， safety of the battery under frontal collision is ensured. Then， multi-level force transmission path is designed for optimization of vehicle body and the front structure of the vehicle is planned and designed based on the collision force value. The feasibility of the research method in this paper is verified through finite element simulation analysis and experiments， providing an effective design method for future vehicle body design and application.

Key words: CTB, mechanical design, frontal collision safety, the blade-battery