Pouch type battery case and pouch type secondary battery

A pouch type secondary battery comprising an electrode assembly therein which is formed by stacking a positive electrode, a separator, and a negative electrode;

• and a pouch type battery case accommodating the electrode assembly, the battery case comprising a pouch film laminate including:
• a sealant layer formed of a first polymer that is an innermost layer;
• a surface protection layer formed of a second polymer that is an outermost layer;
• and
• a gas barrier layer laminated between the surface protection layer and the sealant layer and formed of an aluminum alloy film having a thickness of 60 μm to 100 μm and a grain size of 10.5 μm to 12.5 μm, the grain size being an average of maximum diameters of 30 random grains in a thickness direction cross section of the aluminum alloy film,
• wherein the sealant layer has a thickness of 50 μm to 90 μm, and the pouch film laminate has a total thickness of 180 μm or more.