POUCH-TYPE BATTERY CASE AND LITHIUM SECONDARY BATTERY COMPRISING SAME

A pouch type battery case according to the present invention includes a cup portion provided with an accommodation space for accommodating an electrode assembly, a terrace portion along a perimeter of the accommodation portion, and a gas discharge portion, wherein the gas discharge portion includes at least one through hole formed in the cup portion or the terrace portion and a gas permeable film covering the through hole, the gas permeable film is sealed to the battery case to form a sealing region around the through hole, and the gas discharge portion has an anti-venting index (AVI) of 3.0 or less. The gas discharge portion satisfying the above anti-venting index has a relatively low operating pressure, allowing for efficient gas discharge, and has a high pressure for complete venting, allowing for excellent durability, thereby providing a pouch type secondary battery exhibiting improved safety and lifespan.