Patent ID: 8546013
Filing Date: 2013-10-01
Classification: H01M,Y02E,Y02P,Y10T

Abstract:
1. A cylindrical battery comprising a power generating element constituted of a positive electrode band and a negative electrode band wound in a columnar shape and contained in a cylindrical case, a terminal member connected to one of the electrode bands of the power generating element, and a flexible seal member that seals the clearance between the cylindrical case and the terminal member while insulating the cylindrical case from the terminal member, the terminal member and the seal member being arranged at one end of the cylindrical case and the terminal member being placed to extend through the seal member in an axial direction, wherein the cylindrical case is formed with a first protrusion on an inner surface, the terminal member is formed with a flange on a side surface located more outside in an axial direction than the first protrusion, the flange having an outer diameter larger than an inner diameter of the first protrusion, and an injection port extending through in the axial direction of the cylindrical case, the seal member includes: the flange is formed, on an axially outside surface, with an engagement configuration engageable with the second protrusion, a portion of the cylindrical case located on an end side relative to the first protrusion is bent so that the bent portion folds and presses a part of the large-diameter cylindrical portion against the flange to make the second protrusion engage with the engagement configuration and seal the one end of the cylindrical case, and the flange and the second protrusion have shapes allowing partial contact with each other when the seal member is moved in the axial direction of the cylindrical case before the cylindrical case is bent and also forming a clearance partially even when they are in contact with each other.