In this study, an impact-resistant structure was designed to reduce shock of a secondary battery pack used as a next-generation powertrain, and its effectiveness was validated through numerical analysis and experimental evaluation. The force transmitted to the spacer structure under external impact was measured through drop tests, and this data was used as an input data for finite element analysis (LS-DYNA) to evaluate the shock absorption performance of the proposed impact-resistant structure in terms of energy absorption and deformation. Experimental results from drop tests demonstrated that the application of the impact-resistant structure reduced both the maximum acceleration in time-domain and the peak acceleration in the Shock Response Spectrum (SRS). These findings confirm that the proposed impact-resistant structure can effectively improve the shock mitigation performance of the secondary battery pack.