Patent ID: 8574749
Filing Date: 2013-11-05
Classification: H01M,Y02E,Y02P

Abstract:
1. A lithium secondary battery comprising: an electrode assembly comprising a center pin inside of the electrode assembly; a can housing the electrode assembly; and a cap assembly coupled to a side of the can, wherein at least one end of the center pin comprises a deforming end to deform due to an impact power caused by a collision of the deforming end with an inner surface of the can and/or the cap assembly, preventing the center pin from protruding to an outside of the can and/or the cap assembly; and wherein the deforming end has a diameter that increases along a direction away from the middle of the center pin, wherein the deforming end has a plurality of splits with slits therebetween along a lengthwise direction of the center pin, and at least one split of the plurality of splits is bent radially outward.