Patent ID: 9246157
Filing Date: 2016-01-26
CPC Classification: H01M,Y02E,Y02P,Y10T

Claim Text:
1. A sealed secondary battery comprising: a container body comprising an opening and accommodating 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 sealing body which is formed of a hollow member including a first end face that is open and a second end face that is closed, and is positioned with a vacant space above a surface region of the sealing plate around the injection hole therein by providing a protrusion at a center part of the second end face, the protrusion having a length to project out from the first end face and an outside diameter smaller than that of the injection hole and inserting a portion of the protrusion projected out from the first end face into the injection hole, and which is welded at a peripheral edge portion thereof to the sealing plate, thereby sealing the injection hole, and wherein a gap which communicates with an inside and an outside of the container body is formed between the injection hole and the protrusion inserted into the injection hole, and the gap communicating with the vacant space in the hollow member and the gap completely surrounding the protrusion.