Patent ID: 7704636
Filing Date: 2010-04-27
Classification: H01M,Y02E,Y02P

Abstract:
1. A cell comprising: a flat electrode assembly having a first electrode and a second electrode, the first electrode and the second electrode being arranged to opposed to each other with a separator therebetween and wound into a flat shape having two flat side R portions; and an outer casing for housing the flat electrode assembly, the outer casing being composed of a film composed of a metal layer and a resin layer laminated atop one another, wherein: a width of the first electrode is smaller than that of the separator; the first electrode is located an outermost layer of the flat electrode assembly; and a portion of the first electrode corresponding to an upper end and/or a lower end of at least one of the flat side R portions is cut off, whereby a separator-exposed portion is formed where a portion of the separator wound immediately inside the outermost layer of the flat electrode assembly is exposed through the cut off portion; wherein a width “a” of the separator-exposed portion is 1.0 mm or more while being 100% or less of a thickness L