Pouch type battery cell and method for manufacturing the same

A method for manufacturing a pouch battery cell, in which an electrode assembly is accommodated between a pair of cases, each of which comprises an innermost first resin layer, an outermost second resin layer, and a metal layer stacked between the first resin layer and the second resin layer, the method comprising:

• accommodating the electrode assembly in a cup portion formed in at least one of the pair of cases;
• sealing the first resin layers of the pair of cases to each other;
• forming a folded portion by folding an edge of one case of the pair of cases around a terminal end of an edge of the other case to surround the edge of the other case;
• and
• sealing the metal layers of the one case and the other case on the folded portion directly to each other.

A pouch battery cell, in which an electrode assembly is accommodated between a first case and a second case, each case comprises a first resin layer constituting an innermost layer, a second resin layer constituting an outermost layer, and a metal layer stacked between the first resin layer and the second resin layer, the pouch type battery cell comprising:

• a cup portion provided in at least the first case or the second case and arranged to accommodate the electrode assembly;
• an insulation sealing portion in which the first resin layer of the first case is sealed to the first resin layer of the second case;
• a folded portion in which an edge of the second case is folded around a terminal end of an edge of the first case so that the edge of the second case faces one surface of the edge of the first case and an opposite facing surface of the edge of the first case;
• and
• a metal sealing portion including a first metal sealing portion directly sealing the metal layers of the edge of the second case and the one surface of the edge of the first case, and a second metal sealing portion directly sealing the metal layers of the edge of the second case and the opposite facing surface of the edge of the first case.