Patent ID: 8216705
Filing Date: 2012-07-10
Classification: H01M,Y02E,Y10T

Abstract:
1. A battery, comprising: an electrode assembly including a first electrode plate, a second electrode plate, and a separator; a can that houses the electrode assembly and an electrolyte; and a cap assembly including a cap plate, an insulating plate, a terminal plate, and an electrode terminal that are positioned at an upper opening of the can to seal the can, wherein the cap plate includes a safety vent formed at a first side of the cap plate and an anti-rotation groove integrally formed with a lower recess of the safety vent at a lower surface of the first side of the cap plate, and a width of the anti-rotation groove exceeds a width of the lower recess of the safety vent, wherein the anti-rotation groove has a rectangular shape with a length corresponding to about 10% to about 40% of a length of the cap plate and a width corresponding to at least about 40% of a width of the cap plate, and wherein the protrusion of the insulating plate has a size corresponding to a size of the anti-rotation groove and is coupled with the anti-rotation groove, wherein the insulating plate is coupled with the lower surface of the cap plate, wherein the lower surface of the cap plate faces the electrode assembly, and wherein the safety vent overlaps with the anti-rotation groove, and wherein the insulating plate includes a protrusion formed on an upper surface of the insulating plate and is coupled with the anti-rotation groove.