Lithium ion battery of crimping shape of increased safety

摘要

A cylindrical battery constructed in a structure in which a crimp region is gently bent, such that the crimp region surrounds a gasket located at the inside of the crimp region, a bent front end is continuously bent twice to press the gasket, to be in the form of a compound curve. Under external physical impacts, such as vibration or dropping, applied to the battery, and when the internal pressure of the battery increases, the sealed portions are restrained from being separated from each other, thereby preventing the leakage of an electrolyte and thus greatly improving the safety of the battery. Furthermore, it is possible to minimize the deformation of the container, such as wrinkles, which may be formed due to failure to form the bent area gently when bending the front end of the crimp region with a small radius of curvature.

主权项

1. 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; anda 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; anda 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.