PTFE Compression Sealing for Prismatic and Pouch Battery Cells

Prismatic lithium batteries and pouch flexible batteries are the two most mainstream cell types in new energy vehicle power batteries and energy storage battery packs. Prismatic cells have rigid shell structures, while pouch cells have flexible film packaging structures. The two types of cells have different structural deformation characteristics and assembly sealing requirements, which put forward personalized requirements for battery sealing materials and sealing structures. Traditional unified rubber sealing materials are difficult to adapt to the structural differences of prismatic and pouch cells, resulting in poor sealing fit and low reliability. Professional PTFE compression sealing technology is optimized for the structural characteristics of prismatic and pouch battery cells, realizing high-precision adaptive sealing protection for two mainstream cell types PTFE SHEET.

PTFE compression sealing has excellent flexible compression performance and structural adaptability, which can perfectly match the rigid structure of prismatic cells and the flexible variable structure of pouch cells. For rigid prismatic battery cells, the high-strength compression resilience of PTFE seals can realize tight fitting and fixed sealing of cell gaps, effectively buffering assembly pressure and vibration impact, preventing cell displacement and sealing gap generation. The stable compression performance ensures that the sealing state of prismatic cell modules remains consistent after long-term assembly and operation, without loose sealing failure.

For flexible pouch battery cells, slight expansion and deformation will occur during charge and discharge cycles. Ordinary rigid sealing materials cannot adapt to cell deformation, which is easy to cause excessive extrusion damage or gap leakage. PTFE compression seals have moderate flexibility and compression variable performance, which can adapt to the micro-expansion and contraction deformation of pouch cells, not only avoiding cell extrusion damage, but also maintaining zero-gap sealing state. The ultra-soft and smooth surface of PTFE materials will not scratch the flexible film of pouch cells, protecting the structural integrity of flexible battery packaging PTFE TUBE.

In terms of working condition adaptability, PTFE compression sealing has excellent electrolyte corrosion resistance and thermal cycle stability suitable for cell operation. It can resist the erosion of cell internal electrolyte and volatile gas, avoid sealing swelling and failure, and maintain stable compression sealing performance in long-term charge and discharge cycles. The wide-temperature compression performance ensures that the sealing elasticity will not attenuate in low-temperature and high-temperature environments, adapting to the full-temperature operation of prismatic and pouch cells.

With the diversified development of battery cell types, PTFE compression sealing technology has become a universal high-reliability sealing solution for prismatic and pouch battery cells. It solves the adaptability problem of traditional sealing materials for different cell structures, improves the assembly sealing accuracy and long-term operation stability of battery modules, and provides reliable sealing technical support for the large-scale application of two mainstream lithium battery cells.