US Patent 9685645 Battery pack venting system for electrified vehicle

A battery pack according to an exemplary aspect of the present disclosure includes, among other things, an enclosure that establishes a vent chamber and tubing in fluid communication with the vent chamber. A check valve is mounted outside of the enclosure and is connected to the tubing. The check valve permits flow of battery vent byproducts in a first direction but blocks the flow of atmospheric air in a second, opposite direction.