关键词: 新能源汽车；电池壳体；挤压位移；加强筋

Abstract: With the rapid development of the new energy vehicle industry, the operational safety of battery systems has become a core concern within the sector. Under mechanical abuse conditions such as collisions and crushing, the anti-extrusion performance of the battery enclosure directly affects the overall vehicle safety baseline. The core objective lies in ensuring, through robust structural design, that extrusion displacement or enclosure deformation is controlled within safety thresholds, thereby maximizing the prevention of irreversible mechanical damage to battery cells and avoiding secondary disasters such as fires or explosions caused by short circuits and thermal runaway. Therefore, enhancing the structural stiffness of the enclosure is of great significance. This paper conducts a specific optimization of the anti-extrusion performance for a certain type of new energy battery enclosure. Reinforcing rib structures with a specific layout are added to the edge area of the original lower enclosure cover to suppress displacement progression under compressive loading, and precise dimensional chain calculations are performed to ensure a safe clearance with the internal battery modules. Based on finite element simulation software, the strain and stress contours as well as key data curves of the pre- and post-optimization models under extrusion loading are comparatively analyzed to quantitatively evaluate the effectiveness of the reinforcing ribs in suppressing plastic deformation and preventing overall buckling. The results show that the displacement of the optimized enclosure under extrusion conditions is reduced by 30.894 mm compared to that before optimization, effectively enhancing the structural safety and deformation resistance of the battery pack under extreme operating conditions.

Key words: new energy vehicle; battery enclosure; extrusion displacement; reinforcing ribs