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

摘要： CTP 电池系统采用胶将电芯直接集成到箱体上，相比较传统模组结构的电池系统，取 消了模组结构以及螺栓的固定形式。因此，按照传统的电池包建模方式即电芯当作均质化等 效结构在 CTP 建模中并不适用。为了提升 CTP 电池包仿真精度，文章设计了小型 CTP 电池 包进行扫频实验。根据实验扫频结果，建模详细考虑电芯内部结构及连接关系，当卷芯弹性 模量设置为 50 MPa 时，仿真模态与实验结果吻合度最高。同步研究了模组侧边溢胶、电芯大 面背胶面积、模组压条等因素对电池包刚度影响，研究发现侧边溢胶及压条能有效提高电池 包的刚度，电芯大面背胶面积对刚度影响较小。

关键词: 振动扫频；CTP 电池包；精细化建模；对标分析