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Our thermally conductive gap fillers provide: 

Hot spot protection: Air gaps between the battery cell and heat sink can lead to hot spots, which can damage the heat source due to inefficient heat flow. Gap filler protects the places where those hot spots would take place to help the heat flow temperatures stay consistent and avoid overheating.

Conformability: Using a liquid, conformable gap filler allows you to fill microscopic gaps and imperfections between the battery cells and heat sink that you may not be aware are present. Further, the gap filler enables a more uniform heat transfer by smoothing out surface irregularities.

Recyclability: Gap filler is removable and repositionable, helping reduce material waste if a change to the placement is needed. Further, once an EV battery is disassembled, you can remove gap filler and recycle it.

Our Thermally Conductive Gap Filler solutions

At Bostik, we have two technical approaches:

  • 1K non-reactive gap filler offers protection for automated processing that’s scalable for high volume production. As a non-curing, silicone-free solution, 1K gap filler offers an excellent ratio between thermal conductivity and density to help prevent air from causing hot spots. This non-hazardous, VOC-free option provides reworkability and ease of dismantling with low oil separation (~0,3%)* over the battery’s lifetime, providing long-term stability.
  • 2K SMP gap filler provides high volume dispensing and fast compressing due to optimized viscosity levels. Further, its viscosity increases five times after 90 minutes at 35°C*. Usable for bead applied, automated processes with applications times less than a minute, this option is silicone-free with no VOCs to reduce your environmental footprint. It provides easy processing with low compression forces.

*based on internal testing

Do you need an expert to select the best thermally conductive gap filler, receive a technical data sheet, or request samples?

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Discover more about EV battery thermal management solutions

Thermally Conductive Adhesives

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