Gore’s MultiVent Combines Battery Pack Pressure Equalization and Thermal-Runaway Venting in One Part
The new integrated vent claims to reduce moisture ingress to less than 20 mg per day and cut the number of vents required per pack.
W. L. Gore & Associates has launched the GORE Battery Vents – MultiVent Series, a single-component solution for electric vehicle and energy storage battery packs that integrates pressure equalization, moisture protection, and thermal-runaway gas evacuation.
What Happened
The MultiVent Series mounts through a single opening in the battery pack wall, utilizing two valves and a Gore microporous membrane. In normal operation, one valve opens at defined pressures to allow the pack to "breathe" while blocking water, dust, and debris. According to Gore, the device achieves an airflow of 1,200 L/h at 100 mbar, which the company states is up to six times greater than alternative venting options, thereby reducing the total number of vents required in a pack design.
For thermal-runaway scenarios, the larger valve opens at 50 mbar to provide an evacuation flow of 50 L/s at 180 mbar before resealing the housing. Gore reports that in laboratory testing at 22° C and 50% relative humidity, moisture ingress measured less than 20 mg per day, a figure the company claims is under one-tenth that of many commercially available dual vents. The product builds on technology Gore acquired from Vernay Laboratories in 2026, combining Gore’s membrane expertise with Vernay’s valve technology.
Why It Matters
Battery pack designers have traditionally relied on a combination of dual-stage vents, separate evacuation valves, and desiccants to manage internal pressure and safety. Gore notes that each additional component introduces validation requirements, sealing complexity, and potential paths for moisture intrusion, which can lead to corrosion, sensor faults, and increased warranty costs. By consolidating these functions into a single part, the MultiVent Series offers an alternative architecture that simplifies the pack design and potentially reduces points of failure related to moisture and pressure management.
David Slupe, Gore’s Strategic Marketing Leader for Batteries, stated that the product addresses the historical challenge of balancing airflow, moisture control, and safety using separate components. "We think those challenges are connected. GORE MultiVent gives engineers a way to address them together with a simpler architecture," Slupe said.
The Bottom Line
Gore’s new MultiVent Series represents a shift toward integrated battery pack venting solutions, claiming higher airflow and lower moisture ingress than traditional multi-component setups. The device is positioned to help engineers simplify battery pack architecture while maintaining safety standards for thermal runaway and environmental protection.
