WEVO-CHEMIE Sealant Ensures Reliable High-Voltage Battery Production
With its liquid silicone rubber (LSR) silicone WEVOSIL 23130, WEVO-CHEMIE GmbH offers a material solution for FIPG sealing systems that is specifically tailored to meet the requirements of the Chinese GB 38031-2025 standard. It provides, among other things, high adhesive strength and outstanding mechanical properties. Moreover, adapted processing properties are key to ensuring reliable automated battery production.
The newly developed LSR ensures the housing remains airtight by forming a reliable barrier against any gases and smoke that may be released. At the same time, the material is highly resistant to both mechanical and thermal stress. These attributes help WEVOSIL 23130 play an important role in meeting the requirements set out in the standard.
As a liquid silicone, WEVOSIL 23130 can be applied using the formed-in-place gasket (FIPG) procedure. Compared to cured-in-place gaskets (CIPGs), the chemical adhesion on both sides enables a significantly more robust bond between the sealing material and the standard substrates used for battery housings and cable glands. High adhesive strength further enhances this effect: with more than 2 MPa (megapascals), the silicone achieves significantly higher results than many standard materials. It also effectively prevents any ingression of moisture.
The product provides a high level of thermal and chemical stability, ensuring resistance to hot and corrosive battery gases. Excellent mechanical properties make sure that the seal retains its integrity – even when gas pressure inside the housing is high – without any critical decomposition products being formed.
Its filler-free formulation gives Wevo’s LSR silicone excellent rheological properties, allowing it to be precisely applied using standard mixing and dosing systems as well as static mixers – even on complex 3D geometries.
Additionally, WEVOSIL 23130 combines a long pot life at room temperature (> 24 hours) with precisely controllable heat curing characteristics. After application, for example, localized IR (infrared) heating up to 140 °C can ensure rapid initial curing (< 5 minutes) and adhesion. Simultaneously, there is sufficient processing time to seal large EV battery housings or to allow for any production downtime.
Apart from LSR silicones for reliably sealing EV battery housings, Wevo’s RTV-2 silicone portfolio includes potting compounds for the thermal management of battery components, structural adhesives for mechanically stable bonds between battery cells and housing, and gap fillers for thermal decoupling and the mitigation of thermal runaway as well as silicone gels for protecting electronic assemblies. All these factors help manufacturers of battery systems to develop safe, durable and powerful high-voltage batteries for electric vehicles.
Learn more at wevo-chemie.de/en.
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