Dual stage vents for automotive battery packs play a crucial role in protection, enhancing battery life and reliability with four main functions:
Seal to prevent water, dirt, contaminants and harsh automotive fluids.
Keep continuous pressure equalization to safeguard the battery housing from excessive over - or under - pressure during the battery's lifespan.
Enable effective ventilation. Damp air inside the battery housing can be expelled during each warming - up cycle, avoiding potential internal condensation under specific atmospheric conditions.
Ensure proper mitigation in case of thermal runaway within the battery, quickly releasing large amounts of gases.
The first stage of dual - stage venting is pressure equalization. A porous membrane permits air and other gases to flow in and out of the battery pack. This is required during normal vehicle operation because of altitude and temperature variations. When there's rapid pressure and heat build - up, the second stage maintains internal enclosure pressures by allowing gases to escape either by bypassing the membrane with the umbrella flex or bursting the membrane.
