Pouch-type secondary battery

A pouch-type secondary battery comprising:

• an electrode assembly in which electrodes and separators are stacked;
• a pouch-type battery case comprising a cup part formed in a pouch film configured to accommodate the electrode assembly therein,
• wherein the pouch-type battery case comprises a side extending from the cup part, and
• the side comprises:
• a sealing part disposed along an outer portion of the side;
• and
• a non-sealing part disposed between the cup part and the sealing part,
• wherein the side is configured to contact the cup part without adhering to the cup part and is folded at the non-sealing part,
• wherein the battery case is manufactured by molding the pouch film,
• the pouch film comprises:
• a first layer made of a first polymer and formed at an innermost layer of the pouch film;
• a second layer made of a second polymer and formed at an outermost layer of the pouch film;
• and
• a third layer positioned between the first layer and the second layer,
• wherein the third layer is formed as an aluminum alloy film having a thickness of from 50 μm to 70 μm and a grain size of from 10 μm to 13 μm, and
• the first layer has a thickness of from 60 μm to 100 μm;
• and
• wherein the cup part formed in the pouch film has a depth of 6.5 mm or more.