A New Product For EV Battery Pack Thermal Solution

There are two kind of thermal interface materials for EV battery pack heat transfer in the last years. One is thermal pad and the other one is two-part dispensable thermal gap filler.

Thermal pad is silicone based with high performance. The benefits of thermal pad is ease of use, low cost. But we always got some issues on it, for example, sometimes, the customer requests a great compression under low forces, such as a 50% of compression by 100kPa, that is practically impossible. As we experienced, thermal pad with 30% compression under 200kPa will makes heat transfer optimized.

Two-part thermal gap filler is used to replace thermal pad gradually in recent years. Gap filler is used to fill the gaps between battery modules in pack frame, it is suitable for automated dispensing system to improve productivity and reduce cost. It is high conformable to component topography even unflat surface.

Now it seems like that we have another solution-cell to pack. GLPOLY develop a thermally condcutive adhesive called XK-D25H for this solution.  

XK-D25H is a fast cured two-part thermally conductive adhesive, combining fuctions of thermally conductive, electrical insulation,semi-rigid bonding and sealing. It is ease of use, long service life, suitable for automated dispensing system to improve productivity and bonding effect. XK-D25 is designed for strong bonding of metals or plastics. Better effects can be achieved when it is used together with GLPOLY bonding adjuvants.

It is used for filling gaps between heat source(cell) and heat sink with strong bond to fix cells in pack, in the cell to pack solution, we do not need the battery modules saving a lot of space, more cells could be installed. XK-D25H thermally conductive adhesive features semi-rigid, secant modulus≥173 Mpa, bond strength≥3.7 Mpa, 2.5 W/(m.K) of thermal conductivity, flammability UL 94-V0 and excellent electrical insulation.

Also it characterized temperature resistance: -45~123℃, Short term: 225℃, fast cure, unfix in 5 min and stabilized in 12h. XK-D25H thermally conductive adhesive is designed for automated system to eliminate time consuming hand assembly, reducing manufacturing and logistical complexity, improving productivity.