Overview
Properly designed venting systems provide protection from contaminants along with pressure equalization during normal operating conditions, helping lead to longer-lasting enclosures and battery life cycles. The venting system must also be capable of providing immediate pressure relief, in the rare case of thermal runaway, to help avoid component failure or damage to additional cells.
Donaldson's line of dual-stage vents includes Dual-Stage Burst. These vents help protect automotive battery packs and support battery life and reliability through four key functions:
- Sealing and guarding against water, dirt, contaminants and harsh automotive fluids.
- Continuous pressure equalization to help protect the battery housing against excess over- or under pressure during the life of the battery.
- Effective ventilation, allowing damp air which could accumulate inside the battery housing to be expelled with each warming-up cycle, helping to avoid potential internal condensation issues under certain atmospheric conditions.
- Help ensure proper mitigation in case of a thermal runaway event inside the battery, allowing large amounts of gases to be expelled in a short timeframe.
Features
Stages of Dual-Stage Venting
First Stage
The first stage of dual-stage battery venting is pressure equalization. A porous ePTFE membrane allows air and other gases to move in and out of the battery pack. Pressure equalization is needed during normal vehicle operation, due to changes in altitude and temperature.
Second Stage
The second stage addresses instances of rapid pressure and heat buildup in the battery pack and helps maintain internal enclosure pressures by allowing gases to escape by either bypassing the membrane with the umbrella flex or bursting the membrane.
Dual-Stage Burst Battery Vent
- Retention cap with burst pins – Protects membrane from spray and assists membrane burst
- Tetratex™ ePTFE Membrane – Pressure equalization and protection from water and dirt
- Body – Protects membrane from spray
- Quarter-Turn Bayonet Attachment – Ergonomically secured directly to the battery pack with an audible click for installation confirmation; available in Screw-Fit interface
- O-Ring – Reliable sealing to battery pack wall
Applications
- Battery Electric Vehicles
- Hybrid Electric Vehicles
- Stationary Storage
- Commercial Battery Packs
- Inverters
Resources
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