Impact response analysis and optimization of automotive battery packs filled with negative Poisson ratio structures
CHEN Yiwen
LI Yu
YANG Kun
WANG Yibo
Abstract：[Objective]The safety performance of the battery pack is a critical factor for the overall safety of electric vehicles.Owing to the unique structures and power systems of electric vehicles,they face more challenges in crash safety.To maximize the safety performance of electric vehicle battery packs,the negative Poisson ratio materials were filled into the battery packs.By leveraging the superior properties of negative Poisson ratio materials,such as light weight,excellent vibration isolation and high impact resistance,the impact resistance and safety performance of the battery packs are enhanced.[Methods]First,the negative Poisson ratio material with a concave hexagonal cell structure was taken as the research object.Quasi-static compression test and simulation were carried out to verify that the concave hexagonal structure with negative Poisson ratio structure exhibits an obvious negative Poisson ratio effect.Second,the negative Poisson ratio material was filled into the battery pack,and the impact response analysis was conducted on the negative Poisson ratio-structure-filled battery pack.Finally,the response surface optimization method was adopted,with the minimization of the maximum equivalent stress and the maximum deformation of the battery pack filled with negative Poisson ratio material as the optimization objectives,to optimize the overall structure of the battery pack filled with negative Poisson ratio material.[Results]The results show that the maximum equivalent stress of the battery pack filled with negative Poisson ratio material is reduced by 26.93%compared with that of the original battery pack,the maximum deformation is decreased by 36.92%,and the maximum acceleration is decreased by 46.43%.The battery pack filled with negative Poisson ratio material demonstrates significantly superior safety performance.In addition,the safety performance of the optimized battery pack filled with negative Poisson ratio material is further improved in comparison with that before optimization.
Keywords：Electric car battery packNegative Poisson ratioQuasi-static compressionResponse surface optimizationTest designSafety performance
Publication Date：2026-03-15
Online Publishing Date：2026-09-12(First online date of this platform, not the publication date of the document)
Pages：10( 104-113 )