关键词: 振动扫频；CTP 电池包；精细化建模；对标分析

Abstract: The CTP (cell to pack) battery system integrates individual cells directly onto the housing using adhesive, eliminating the need for module structures and bolt fastening methods compared to traditional modular battery systems. Therefore, the traditional battery pack modeling approach, which treats individual cells as homogeneous equivalent structures, is not applicable in CTP modeling. To enhance the simulation accuracy of CTP battery packs, this study designs a small-scale CTP battery pack for frequency sweep experiments. Based on the experimental frequency sweep results, the detailed modeling takes into account the internal structure and connection relationships of the battery cell. When the elastic modulus of the winding core is set to 50 MPa, the simulation mode achieves the highest consistency with the experimental results. Additionally, factors such as moduleside adhesive overflow, large-area back adhesive of the cells, and module pressure strips are investigated for their impact on battery pack stiffness. The findings indicate that side adhesive overflow and pressure strips can effectively improve the stiffness of the battery pack, while the large-area back adhesive of the cells has a relatively minor effect on stiffness.

Key words: frequency sweep vibration; CTP battery pack; high-fidelity modeling; benchmarking analysis