Pouch Sealing Apparatus

A pouch sealing method to seal a pouch for secondary batteries comprising an upper pouch and a lower pouch, the pouch being configured to receive an electrode assembly and an electrolytic solution, the pouch sealing method comprising:

• (s1) horizontally locating the upper pouch and the lower pouch on a mounting unit and disposing a gas pocket portion of the pouch between a pair of rail units, the pair of rail units being vertically spaced apart from each other, the rail units each including a pair of rails, the rails in each pair being horizontally spaced apart from each other by a predetermined distance;
• (s2) bringing the upper pouch of the gas pocket portion and the lower pouch of the gas pocket portion into tight contact with each other while moving a pair of press rollers on the pair of rail units from an end of the gas pocket portion of the pouch in a direction toward the electrode assembly;
• (s3) moving the pair of press rollers in a direction away from the electrode assembly, so as to space the pair of press rollers apart from the electrode assembly by a predetermined distance;
• and
• (s4) sealing the upper pouch and the lower pouch at a position located between the press rollers and the electrode assembly using a sealing unit.