Freudenberg Sealing Technologies will present new technologies at the 2025 Battery Show North America, taking place October 6th to 9th at Huntington Place in Detroit (Booth 5208). The company will highlight developments in battery pressure equalization, sealing for busbar applications, and thermal management for high-performance EVs.
Expanded DIAvent portfolio
Lithium-ion battery housings must remain hermetically sealed for safety and performance while still regulating internal pressure. Freudenberg’s DIAvent portfolio is designed to provide pressure equalization during normal operation and emergency degassing when required.
The portfolio includes compact solutions for smaller battery systems, high-capacity elements for larger vehicles, and components for e-motors, axles, and inverters.
Two new components broaden the portfolio:
- DIAvent maxFlow: Uses an open degassing vent that provides full degassing at the pressure threshold, with adjustable activation between 50 and 200 mbar.
- DIAvent Hybrid: Combines permanent bidirectional pressure equalization with emergency degassing and allows direct mounting of its aluminum cover to the battery housing.
Both are intended for high-energy-density battery systems and expand the available options for automakers and battery manufacturers.
Sealing for busbar applications
Busbars present sealing challenges due to irregular geometries and exposure to aggressive media and high temperatures. Freudenberg has developed a sealing technology for both rectangular and round busbars that eliminates additional assembly steps, lowers leak risk, and improves long-term durability. Suitable for low and high-voltage systems, the solution withstands -40° to 200° C and resists thermal cycling and chemical exposure.
Thermal management components
As EV batteries increase in capacity and charging speeds, cooling requirements become more demanding. Freudenberg’s fluid connectors are designed to handle a range of cooling fluids and system loads, simplifying assembly by integrating multiple functions into single components.
These connectors, along with solenoid valves that regulate fluid and air flow, are intended to maintain stable cell temperatures and extend battery life in fast-charging scenarios.
Other technologies on display include:
- A 3D Waveguide Antenna to improve radar precision and reliability for ADAS and autonomous systems.
- Battery cell caps, housing gaskets, and a thermal barrier demonstrator.
- Contributions from SurTec Group (surface finishing chemicals) and Freudenberg Filtration Technologies (filtration systems).
Filed Under: Batteries, Technology News, Thermal Management