Sealed secondary battery and manufacturing apparatus and manufacturing method therefor

A manufacturing method for a sealed secondary battery, comprising:

• loading a battery container, which is injected with an electrolyte through an injection hole, into a chamber;
• hermetically closing the chamber into which the battery container is loaded and then decompressing the chamber;
• mounting a sealer for sealing the injection hole on the injection hole of the battery container in the decompressed chamber by means of a sealer mounting tool;
• and
• laser-welding the sealer to the battery container by applying a laser beam to the peripheral edge portion of the sealer on the battery container through a laser transmission window formed in one surface of the chamber.

A sealed secondary battery comprising:

• a container body which comprises an opening and accommodates an electrode assembly and an electrolyte;
• a sealing plate which seals the opening of the container body, the sealing plate comprising an injection hole which is formed penetrating the sealing plate and through which the electrolyte is injected into the container body;
• and
• a sealer mounted on that part of the container body in an internally decompressed state which surrounds the injection hole and welded at a peripheral edge portion thereof to the sealing plate, thereby sealing the injection hole.