Overview

Dual-stage venting systems are the key to handling a wide range of battery venting needs – from pressure equalization to rapid degassing, Donaldson offers dual-stage venting solutions designed to handle the most rigorious operating conditions. Our dual-stage vents feature proprietary hydrophobic and oleophobic Tetratex® expanded polytetrafluoroethylene (ePTFE) membranes for increased performance and protection.

Donaldson offers engineering and design support of its integrated venting solutions for multiple industry applications including:

  • Battery Electric Vehicles
  • Hybrid Electric Vehicles
  • Heavy Duty Vehicles
  • Battery Energy Storage Systems
  • Commercial Battery Packs

 

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

In the case of rapid pressure and heat buildup, the second stage helps maintain internal enclosure pressures by allowing gases to escape by either by bursting the membrane or jettisoning the protective cap.

Dual-Stage Venting Works

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

Protection from the Inside Out

All Donaldson dual-stage battery vents incorporate our proprietary Tetratex ePTFE membrane technology. Manufactured in-house, the membrane is comprised of small, randomly connected fibrils that create a permeable water barrier, which provides continuous pressure equalization, ingress protection against water, dirt, and other contaminants. The membrane’s unique oleophobic treatment also helps the filter media repel oils, providing additional protection.


Solutions

Dual-Stage Jet

The dual-stage Jet takes battery safety to a new level with the industry’s fastest degassing capabilities. Engineered to provide optimal pressure equalization and ingress protection during normal operating conditions, the Jet will jettison its cap and poppet in the event the internal pack pressure exceeds the opening pressure. The rapid degassing occurs at roughly 100 liters/second @ 100 mbar, greatly reducing potential damage to additional cells.

  • Screw-Fit or Bayonet Interface
  • Minimum Airflow of 97 liters/hour @ 10 mbar
  • Opening Pressure of 115 mbar

Dual-Stage Burst

The dual-stage Burst vent provides consistent pressure equalization while keeping the battery pack sealed from external contaminants. The low-profile vent features a protective body and retention cap with burst pins that pierce the membrane providing quick pressure relief at a rate of 25 liters/second @ 300 mbar.

  • Screw-Fit or Quarter-Turn Bayonet Interface
  • Minimum Airflow of 17.8 liters/hour @ 10 mbar
  • Opening Pressure of 250 mbar