SEALING STRUCTURE OF SEALED BATTERY, AND SEALED BATTERY

摘要

PROBLEM TO BE SOLVED: To maintain the sealability of an injection hole for injecting an electrolyte into a sealed battery.SOLUTION: A sealing structure comprises: a sealing plate having a liquid injection hole; and a sealing plug for sealing the liquid injection hole. The sealing plug has a press-fit member containing an elastic material and being press fitted in the liquid injection hole to close the liquid injection hole, and a planar holding member being bonded to the sealing plate and pressing the press-fit member so as to be held in a state press-fitted in the liquid injection hole. The press-fit member has a planar base having a diameter larger than that of the liquid injection hole, and comes into contact with the holding member on one principal surface, and a protrusion provided to protrude from the other principal surface of the base and being inserted into the liquid injection hole. The protrusion has a diameter PD1 at a boundary part to the base that is larger than the diameter HD1 of a first opening of the liquid injection hole on the holding member side, and a diameter PD2 at the tip portion that is smaller than the diameter HD1. In a state where the liquid injection hole is sealed by the sealing plug, a gap L1 is provided between the base and the first opening of the liquid injection hole.