Patent ID: 8889288

Claim:
A cylindrical battery, comprising: a cylindrical container having an open upper end; an electrode assembly mounted in the cylindrical container; a cap assembly mounted to an upper end of the container; and a crimp region formed at the upper end of the container and overlying the cap assembly, wherein the crimp region comprises: an upwardly extending portion having an upper end; and a radially inwardly extending portion extending from the upper end of the upwardly extending portion, the inwardly extending portion formed as a compound curve having a first end and a second end, the compound curve being arcuate along an entire length between the first and second ends, the compound curve comprising: a first section extending from the first end, the first section having a first radius of curvature; and a second section extending from the first section to the second end, the second section having a second radius of curvature, the second radius of curvature being larger than the first radius of curvature.