Liquid Injection Device

A liquid injection device for injection of electrolytic solution into a bag-shaped film exterior containing a generation element, the liquid injection device comprising:

• a nozzle structured such that the electrolytic solution is injected into the bag-shaped film exterior through the nozzle;
• and
• a first seal mechanism including a pair of elastic bodies structured to press the bag-shaped film exterior with the nozzle inserted in the bag-shaped film exterior, and thereby establish sealing around the nozzle;
• wherein:
• the nozzle includes an outer circumferential nozzle shaped tubular and structured such that the first seal mechanism establishes sealing around the outer circumferential nozzle, and includes an inner circumferential nozzle shaped tubular and structured expandable telescopically through the outer circumferential nozzle;
• the outer circumferential nozzle and the inner circumferential nozzle form therebetween an electrolytic solution passage structured such that the electrolytic solution flows through the electrolytic solution passage;
• the inner circumferential nozzle forms therein a decompression passage structured such that gas inside the bag-shaped film exterior is evacuated through the decompression passage;
• the outer circumferential nozzle includes a liquid injection port, and the inner circumferential nozzle includes a suction port;
• and
• in a state that the inner circumferential nozzle is expanded, the suction port opens at a position protuberant with respect to the liquid injection port in an axial direction of the outer circumferential nozzle.