Wacker Chemical Corporation used The Battery Show North America to spotlight a portfolio of thermally conductive (TC) adhesives aimed at next-generation EV battery designs. The line spans silicone TC adhesives and a proprietary hybrid based on silane-terminated polyether (STP-E) chemistry, targeting use cases where thermal management and mechanical bonding must work together inside tightly packaged packs.
The company positions these materials for architectures moving from cell-to-module to cell-to-pack and cell-to-chassis. In those layouts, gap distances shrink and heat paths change, so bond lines and interface layers need to move heat out of cells while holding modules rigid under vibration and crash loads. Wacker says the formulations focus on high thermal conductivity along with flexibility, chemical resistance, and flame retardance.
Silicone-based TC adhesives and gap-filling compounds are intended for interfaces between cells, cooling plates, and structural members. The STP-E hybrid is pitched where a tougher mechanical bond is required but designers still want the temperature resistance and compliance typically associated with silicones. According to Wacker’s technical brief for the show, that hybrid approach is designed to combine the handling and strength of organic systems with the temperature stability and elasticity of silicone chemistries.
Beyond the chemistries themselves, Wacker emphasized pigmentability and process compatibility for high-throughput battery lines. That includes dispensing characteristics for automated application, curing profiles that can be tuned to line speeds, and grades suitable for different bond-line thicknesses and surface finishes across aluminum, coated steels, and composite housings.
The announcement fits a broader shift in EV battery engineering. With packs consolidating and power densities climbing, materials at the cell and module interfaces need to both carry heat and secure structure. Wacker is pushing its TC adhesives portfolio into that space with options that can be selected by target bond strength, cure strategy, and thermal path geometry, rather than a one-size-fits-all filler.
