The new two-component (2K) addition-curing silicone adhesive is for thermal management in EV batteries and power electronics
Wevo has introduced Wevosil 28015 FL, a new two-component (2K) addition-curing silicone adhesive that combines high thermal conductivity, mechanical strength, and residual flexibility – a unique performance blend tailored for electric vehicle (EV) batteries and power electronics
The new material represents a significant step forward in structural bonding and thermal management for next-generation mobility systems.
BALANCING THERMAL AND MECHANICAL PERFORMANCE
Modern electric drivetrains and power electronics operate at increasing power densities, making thermal control a key design challenge. Conventional gap fillers and pastes provide good heat transfer but lack structural integrity, often requiring additional fasteners or mechanical supports. Wevo’s new adhesive bridges this gap by offering thermal conductivity of 1.5W/m·K, while maintaining the strength of a structural bonding material.
Tested according to DIN EN ISO 22007-2:2015-12 (hot-disk method), the material effectively conducts heat away from components, preventing thermal hotspots that can degrade performance or reduce service life. Simultaneously, a Shore A hardness of 70 and modulus of elasticity of 60N/mm2 ensure a mechanically stable bond even under structural loads – a crucial advantage for battery modules that serve as load-bearing components in modern vehicle architectures.
Despite its stiffness, Wevosil 28015 FL retains an elongation at break of 20–25%, providing sufficient flexibility to accommodate differential thermal expansion between bonded materials and to mitigate stress-induced cracking during temperature cycling.
DESIGNED FOR PROCESS EFFICIENCY
The new 2K RTV silicone is thixotropic, making it suitable for bead dispensing from standard cartridges, hobbocks, or drums. It supports both CIPG (Cured-In-Place Gasket) and FIPG (Formed-In-Place Gasket) applications, giving manufacturers flexibility in automated assembly.
Fast curing further enhances productivity. When exposed to infrared (IR) or laser radiation, the adhesive achieves initial adhesion exceeding 2MPa within minutes, significantly shortening cycle times. This rapid cure behaviour enables seamless integration into automated production lines for EV battery modules or power electronics housings. The addition-curing mechanism prevents volumetric shrinkage and gap formation, ensuring reliable bonding even in closed assemblies or complex geometries.
APPLICATIONS IN EV BATTERIES
In battery systems, Wevosil 28015 FL supports structural bonding of modules to their housings, while maintaining a thermal connection to cooling systems or bodywork heat exchangers. This dual function enhances both mechanical stability and heat dissipation, contributing to improved crash safety and operational efficiency under extreme temperature fluctuations.
For power electronics, the adhesive offers a robust alternative to traditional thermal interface materials. By combining mechanical rigidity with high thermal transfer, it eliminates the need for additional fasteners or layered constructions, simplifying assembly and improving long-term reliability of inverters, converters, and control units operating under continuous thermal cycling.
SUPPORTING INNOVATION IN THERMAL MANAGEMENT
With Wevosil 28015 FL, Wevo continues to expand its portfolio of customised silicone systems for the automotive and electronics sectors. The company’s focus on combining thermal, mechanical, and processing performance reflects a growing demand for multifunctional materials that enable efficient, lightweight, and reliable component design.
As EV platforms evolve toward higher power and tighter packaging, materials like Wevosil 28015 FL are poised to become key enablers of safer, more efficient, and more durable energy systems.
