Four product types in particular are highlighted.
Thermally Conductive Adhesives are a vital technology for battery thermal management and are especially important for the new cell-to-pack battery designs. Thermally Conductive Adhesives have a dual functionality: As well as transferring heat from the battery cells to the cooling plate, they also serve as an adhesive to bond together two substrates. Key products of Henkel are Loctite EA 9497, a two-component epoxy-based solution, and Loctite TLB 9300 APS, a two-component PU-based solution, especially designed for bead and injection process in battery modules.
Thermal propagation prevention materials are essential to protect passengers from the risk of fires - and help to inhibit the spread of fires to ensure that EV passengers have sufficient time to exit a vehicle safely. Battery safety and fire protection is a key focus area for Henkel, which has pioneered Thermal propagation prevention solutions, including the recent launch of two fire protection coatings dedicated for EV batteries, Loctite EA 9400 and Loctite FPC 5060.
Electrode conductive coatings and dielectric coatings are part of Henkel’s portfolio of functional coating materials addressing a breadth of applications for EV batteries. Conductive primers for cathodes or anodes reduce the internal electrical resistance and increase the adhesion between active material and current collector foils of battery cells, thereby improving the overall lifetime performance. Sprayable dielectric coatings for battery cell casings, on the other hand, provide electrical insulation where needed. With UV light curing technology and what is described as excellent interfacial adhesion, they also provide compatibility with Henkel’s structural and thermal adhesives.
Compression pads provide a cushion to prismatic and pouch cells for cell-breathing - the expansion and contraction that occurs during charging cycles and with exposure to high temperatures. Thanks to their elastic characteristics, they allow enough pressure to be applied within the battery pack to maintain thermal and electrical connections. The solution draws on Henkel’s materials science expertise to provide an ideal combination of qualities: Heat resistivity and shielding for thermal propagation prevention, light weight, and high mechanical robustness.