June 17, 2024

Evonik is expanding its TEGO Therm product range to provide heat protection and fire-resistant coatings for electric vehicle (EV) battery housings and covers. In the rapidly growing EV market, safety standards for lithium-ion batteries are becoming increasingly stringent. Coatings based on Evonik's TEGO Therm products are a robust solution to the industry's demand for effective thermal insulation barriers, which are essential for preventing thermal runaway in EV batteries.

The TEGO Therm toolbox includes a variety of components, each meticulously engineered to enhance the performance of thermal insulation and fire-resistant coatings. Among these, TEGO Therm HPG 4000 granules boast a microporous silica core, which provides superior low thermal conductivity, high hydrophobicity, and reduced flammability. TEGO Therm HPG 6806, a finer silica-based granule, not only excels in insulation but also strengthens mechanical performance and ensures smooth, even surfaces of insulation coatings. The waterborne polysiloxane hybrid binder, TEGO Therm L 300, further enhances the thermal stability and fire resistance of protective coatings.

Coatings based on this range of products meet the UL 94 V-0 fire safety standards, providing a new level of protection for EV batteries. The versatility of TEGO Therm allows for spray application on complex three-dimensional substrates, ensuring complete and efficient fire resistance of the coverage of every contour of the battery housing.

“The synergy between TEGO Therm binder and granules is at the core of our solution. It minimises heat transfer and effectively inhibits the spread of fires, offering crucial additional time for emergency response”, said Dr. Niko Haberkorn, global head of business development for the Market Segment Industrial & Transportation Coatings at Evonik Coating Additives. “Moreover, our products ensure high mechanical resistance, maintaining structural integrity in high-temperature scenarios.”

Evonik's commitment to safety and innovation is demonstrated by rigorous testing. When subjected to a propylene flame with more than 1000 °C, TEGO Therm-based coatings protected the substrate effectively, with the temperature on the back of substrate remaining moderate, even with a thin dry film thickness. These results underscore the effectiveness of the product in insulating against intense heat and highlight its suitability for applications where space is at a premium.

For more information about Evonik Coating Additives and the innovation project, please visit: www.coating-additives.com