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A sealed battery includes a sealing plate 13 sealing a mouth of an outer can, an external terminal 16 attached to the sealing plate 13 and having a connecting terminal 23, and a current interruption mechanism 18 interrupting current in response to pressure increase in the outer can that is installed

A sealed battery includes a sealing plate 13 sealing a mouth of an outer can, an external terminal 16 attached to the sealing plate 13 and having a connecting terminal 23, and a current interruption mechanism 18 interrupting current in response to pressure increase in the outer can that is installed in a conductive pathway electrically connecting the connecting terminal 23 and an electrode assembly. In the connecting terminal 23, a through-hole 23b continuing to the space on the current interruption mechanism 18 at the side corresponding to the outside of the battery is formed. The through-hole 23b is sealed with a terminal stopper 30 made of an elastic member so as to form a closed space between the terminal stopper 30 and current interruption mechanism 18. An electrolyte or washing solution hardly enters the current interruption mechanism during the manufacture can be provided.

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1. A method for manufacturing a sealed battery including an outer can having a mouth, an electrode assembly having a positive electrode plate and a negative electrode plate, and a sealing plate having an external terminal having a connecting terminal with a through-hole, comprising: attaching a curr

1. A method for manufacturing a sealed battery including an outer can having a mouth, an electrode assembly having a positive electrode plate and a negative electrode plate, and a sealing plate having an external terminal having a connecting terminal with a through-hole, comprising: attaching a current interruption mechanism to the connecting terminal to seal one end of the through-hole;flowing a gas from the other end of the through-hole to examine air leakage between the connecting terminal and the current interruption mechanism; andsealing the though-hole. 2. The method for manufacturing a sealed battery according to claim 1, wherein the through-hole is sealed by inserting a terminal stopper into the through-hole. 3. The method for manufacturing a sealed battery according to claim 2, wherein the terminal stopper includes an elastic member. 4. The method for manufacturing a sealed battery according to claim 1, wherein the terminal stopper composed of an elastic member and a metal plate is used;the terminal stopper made of the elastic member is inserted into the through-hole; andthe metal plate is welded to the connecting terminal. 5. The method for manufacturing a sealed battery according to claim 4, further comprising: attaching an inversion plate to a sealing tab; andflowing a gas from the other end of the through-hole to examine,wherein the current interruption mechanism includes the sealing tab, the inversion plate, and a collector having a breaking portion. 6. The method for manufacturing a sealed battery according to claim 5, further comprising: attaching the breaking portion of the collector to the inversion plate; andflowing a gas from the other end of the through-hole to examine. 7. The method for manufacturing a sealed battery according to claim 1, wherein the though-hole is sealed with a metallic member. 8. The method for manufacturing a sealed battery according to claim 2, wherein an axial thickness of the terminal stopper is formed thicker than a thickness of the sealing plate. 9. The method for manufacturing a sealed battery according to claim 2, wherein the current interruption mechanism includes an inversion plate, andan axial thickness of the terminal stopper is formed thicker than a thickness of the inversion plate. 10. The method for manufacturing a sealed battery according to claim 2, wherein the connecting terminal includes a flange opposed to an outer surface of the sealing plate and a gasket, andan axial thickness of the terminal stopper is formed thicker than a thickness of the flange. 11. The method for manufacturing a sealed battery according to claim 2, wherein the connecting terminal includes a flange opposed to an outer surface of the sealing plate through a gasket, andan axial thickness of the terminal stopper is formed thicker than a thickness of the gasket interposed between the outer surface of the sealing plate and the flange.