Patent ID: 9419252
Filing Date: 2016-08-16
CPC Classification: H01M,Y02E

Claim Text:
1. A case having an obround cross-sectional shape with two semicircular ends connected to parallel straight sides at endpoints of each semicircular end for a battery to house an electrode assembly, comprising: an opening in the case through which the electrode assembly is inserted; a bottom portion at an end of the case opposite to that of the opening; a front portion corresponding to one of the parallel straight sides and partial segments of both semicircular ends connected to the bottom portion; a back portion corresponding to another one of the parallel straight sides and partial segments of both semicircular ends connected to the bottom portion and the front portion; a joint portion arranged on an interior surface of the obround cross-sectional shaped case along the front and back portions; and a first area and a second area disposed longitudinally in the front and back portions, said second area on either side of the first area, said first area extending along the front and back portion on opposite sides of a center line of the front and back portions and said second area extending from the first, area entirely around each semicircular end of the case, wherein the joint portion in the second area is thicker than the joint portion in the first area, a distance between opposite sides of the joint portion in the first area is greater a distance between opposite skies of the joint portion in the second area, and the first area is wider than the second area.