Apparatus for press forming

A press forming apparatus, comprising:

• a die in which a molded portion is formed by being recessed inwardly from an upper surface thereof;
• a punch provided above the die to be movable upwardly and downwardly, and inserted into the molded portion when moving downwardly toward the die;
• and
• a stripper positioned between the die and the punch and configured to fix an object to be formed disposed on the die by applying pressure to the object to be formed while the punch is being inserted into the molded portion to form an electrode assembly accommodating portion in the object to be formed,
• wherein a surface of the molded portion, in contact with the object to be formed, has a polygonal shape,
• wherein the punch comprises a vent for blowing air onto an upper surface of the object to be formed,
• wherein the molded portion includes an air intake inlet configured to remove air between the punch and the molded portion, and
• wherein the molded portion of the die comprises a urethane-based resin.