Abstract: In the lightweight design of battery packs, flow drill screw (FDS) connection technology is crucial for enhancing the energy density and mechanical performance of the battery pack. Considering the sealing property and structural strength, the correct application of structural sealant in FDS connection technology is particularly important. Starting from the application of FDS connection technology, this paper mainly introduces the selection method and quality evaluation standard of structural sealant in FDS connection technology. Through the design of cross experiments, the role and influence of different FDS structural sealants in the connection between the liquid cooling plate and the box frame are studied. Reliability experiments are conducted to verify the performance after FDS connection with two different types of structural sealants. The experimental results show that there are differences between the two types of sealants in FDS connection applications. Through experimental analysis, the most suitable structural sealant for FDS connection of battery boxes is finally selected, and it meets the vibration, impact, sealing, salt spray and other performance requirements of the entire battery pack.

Key words: flow drill screw; structural sealant; mechanical performance; salt spray test; sealing performance

摘要： 在电池包的轻量化设计中,流钻螺钉（FDS）连接技术对提高电池包的能量密度、机械 性能至关重要。从密封性、结构强度考虑，FDS 连接技术中结构密封胶的正确应用更是关键。 文章从 FDS 连接技术应用出发，着重介绍了 FDS 连接技术中结构密封胶的选用方法和质量评 价标准，通过设计交叉实验研究了不同 FDS 结构密封胶在液冷板与箱体框架连接中的作用和 影响。对分别使用两种不同类型结构密封胶搭配 FDS 连接后进行了可靠性实验验证，实验结 果表明两种胶在 FDS 连接应用中存在差异。通过实验分析，最终筛选出了最适合电池箱体 FDS 连接的结构密封胶，且满足整包的振动、冲击、密封、盐雾等性能要求。

关键词: 流钻螺钉；结构密封胶；机械性能；盐雾实验；密封性能