Battery cell and battery cell manufacturing apparatus for manufacturing the same

A battery cell, comprising:

• a battery case having an accommodation portion in which an electrode assembly is mounted, and a sealing portion formed by sealing an outer periphery thereof;
• an electrode lead electrically connected to an electrode tab included in the electrode assembly and protruding out of the battery case via the sealing portion;
• and
• a lead film located at a portion corresponding to the sealing portion in at least one of an upper portion and a lower portion of the electrode lead,
• wherein a non-adhesion portion is formed on an outer surface of the lead film without penetrating the lead film, and the non-adhesion portion is configured to face and contact an outer surface of the electrode lead to define a non-adhesion region between the electrode lead and the lead film such that a gas generated inside the battery case is configured to be introduced into the non-adhesion region and to be discharged outside the battery case through the non-adhesion region between the lead film and the electrode lead.