What is a thermal interface material and where does nitrile foam fit?
A thermal interface material, or TIM, is anything placed deliberately between a component that makes heat and the structure meant to carry that heat away. Without it, the two surfaces touch only at high points and the rest of the joint is air, which insulates.
Prateek® Nitrile Foam Tape is used as a thermal interface material in battery packs. It helps transfer heat away from battery cells and ensures consistent thermal connections within the battery pack, the word to notice is consistent, because uneven contact means uneven cell temperatures across a module.
Where a higher and specified thermal conductivity is required, pack designers move to our Mr.Bond® thermal pads, which are UL 94V0 approved and available from 1 W/m·K to 8 W/m·K. The complete group range is at Prateek® Tapes.
Why use a foam tape rather than a rigid material?
Battery assemblies move. Cells expand and contract as they charge and discharge, tolerances stack up across a module, and the pack is subject to vibration in service. A rigid interface cannot absorb any of that; a foam one can.
Nitrile foam is compressible, so it takes up variation between parts and keeps contact under compression instead of breaking it. That is the mechanism behind the claim that it ensures consistent thermal connections within the battery pack.
It is supplied in tape form, so it is applied as part of normal assembly rather than dispensed or cured.
How do I specify nitrile foam tape for my pack?
Send the gap you need to fill, the footprint of the part, and where in the pack the material sits. Those three things drive the specification more than anything else.
If your requirement is a stated thermal conductivity figure rather than a compliant gap filler, say so in the enquiry, the thermal pad range is specified by conductivity and is customised per specification, while this foam tape is specified as a thermal interface material for cell-to-structure contact. Share your requirement and the technical team will confirm what suits.
What to measure before specifying a thermal layer is covered on the thermal interface materials page, and the EV battery tapes hub shows where this tape sits among the other pack materials.