Wevo develops thermally conductive silicone adhesive for EV battery modules, electronics

Ostfildern-Kemnat, Germany – Wevo-Chemie GmbH has introduced a new two-component silicone adhesive, designed for use in battery modules and power electronics.

The addition-curing Wevosil 28015 FL room temperature vulcanising (RTV) material combines ‘high thermal conductivity with structural strength and residual flexibility’, said the German company 20 Oct.

The material enables manufacturers to “implement targeted thermal management" while producing mechanically stable components.

In electric vehicles, battery modules are increasingly taking on load-bearing functions within the body structure and must deliver both crash safety and thermal stability.

In power electronics, where chips and circuit boards generate concentrated heat, conventional thermally conductive pastes or gap fillers often lack mechanical strength, requiring extra fasteners.

Wevo said its new adhesive, with a Shore A hardness of 70 and a modulus of elasticity of 60 N/mm², ensures durable bonding of modules to housings or adjoining parts.

At the same time, the adhesive maintains a reliable thermal link to cooling systems or vehicle bodywork used as heat exchangers.

According to the company, the material has a thermal conductivity of 1.5 W/m·K, providing efficient heat dissipation at high power densities.

The material is claimed to remain stable up to 200 °C and flexible down to −60 °C, with an elongation at break of 20–25 % to prevent cracking under temperature stress.

Furthermore, the silicone cures rapidly — reaching initial adhesion above 2 MPa “within minutes” under infrared or laser exposure, said Wevo.

This allows the material to be integrated into automated assembly processes.

Wevo said the new adhesive combines thermal and structural properties in one material, reducing process complexity and supporting long-term reliability of sensitive components.