Silicone gel enables higher voltage power electronics in EVs and renewable energy tech

Dow has launched DOWSIL EG-4175 Silicone Gel, a highly reliable protective solution for next-generation IGBT modules that operate at higher voltages. This new advanced material resists the higher temperatures associated with these IGBTs, supporting greater reliability, lower power losses, and higher power efficiencies in EV batteries, inverters for PV panels, and wind turbines.

The new silicone gel withstands temperatures up to 180C and expands the company's growing portfolio of solutions for power electronics. The material also absorbs vibrations and has self-healing properties that repair small cracks without external intervention. It provides self-priming adhesion for improved module protection and cures at room temperatures for excellent energy efficiency. Heat-accelerated curing may also be used to reduce cycle times.

"Dow is upgrading our IGBT materials portfolio to address the emerging trend toward achieving higher power densities," said Cathy Chu, global strategic marketing director, Consumer and Electronics, Dow. "With its higher-temperature resistance compared to incumbent materials, this new silicone gel will enable our customers to design and manufacture higher-density IGBT modules with greater power system efficiency. This demonstrates Dow's commitment to advancing the EV and renewable energy sectors, both of which contribute significantly to global carbon reduction."

The launch of this silicone gel supports key trends in EVs and renewable energy. In EVs, battery voltages are increasing from 400V to 800V to allow a more efficient main inverter and faster battery charging. In PV panels and wind turbines, the power densities of inverters are increasing. This improves power efficiency and supports the handling of greater electrical loads. With higher junction temperature associated with higher voltages and greater electrical loads of the seventh generation IGBT technology, a silicone gel needs to have strong dielectric properties and enhanced thermal resistance.

The company's portfolio of silicone-based dielectric gel products provides thermal resistance, electrical insulation, encapsulation, stress relief, and mechanical and environmental protection. The company's advanced silicon gel builds on these properties and offers several additional advantages, including high-temperature resistance, low levels of silicone oil bleed, and adhesion without the need for a primer. Gels are a special class of encapsulants that can cure to an extremely soft material while providing the dimensional stability of an elastomer.

DOWSIL EG-4175 Silicone Gel joins DOWSIL EA-7158 Adhesive, an existing product, as part of the company's total solution for IGBT modules. DOWSIL EA-7158 Adhesive is a one-part, high-strength silicone product that delivers excellent primerless adhesion to many substrates. This solvent-free, non-flowing material cures rapidly with heat and is translucent in colour.