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 jettison the vent poppet/cap (Dual-Stage Jet) or bursting the membrane (Dual-Stage Burst).
Dual-Stage Burst Battery Vent
A. Retention Cap with Burst Pins
- Protects membrane from spray
- Tested for water and air tightness
B. Tetratex® ePTFE Membrane
- Hydrophobic and oleophobic to protect against water, dirt and other contaminants
- Consistent pressure equalization with minimum airflow of 17.8 liters/hour @ 10 mbar during normal operation
C. Body
- Protects membrane from spray
D. Quarter-Turn Bayonet Interface
- Easy attachment to battery pack housing
- Also available with Screw-Fit interface
E. O-Ring
- Reliable sealing to battery pack wall
Dual-Stage Jet Battery Vent
A. Cap
- Protects membrane from spray
- Tested for water and air tightness
- Jettisons during a thermal runaway
B. Tetratex® ePTFE Membrane
- Hydrophobic and oleophobic to protect against water, dirt and other contaminants
- Consistent pressure equalization with minimum airflow of 97 liters/hour @ 10 mbar during normal operation
C. Poppet
- Secures membrane and shields from spray
- Jettisons during a thermal runaway
D. Custom Seal
- Prevents dust/water from entering battery pack
E. Body
- Signature design enables adjustable release pressure and reliable performance
F. ISO-6149 Threaded Interface
- Easy, reliable attachment to battery pack housing
- Bayonet interface available as needed
G. O-Ring
- Reliable sealing to battery pack wall
Applications
- Battery Electric Vehicles
- Hybrid Electric Vehicles
- Heavy Duty Vehicles
- Battery Energy Storage Systems
- Commercial Battery Packs
Resources
Articles
Videos
Donaldson Dual-Stage Jet Vent for Automotive Battery Packs
The innovative dual-stage Jet vent takes battery pack safety to the next level with optimal pressure equalization, superior ingress protection, and the industry's fastest degassing capabilities.
