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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 the Dual-Stage Burst and Dual-Stage Flex. These vents help protect automotive battery packs and support battery life and reliability through four key functions:
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.
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.