Patent ID: 8871381
Filing Date: 2014-10-28
Classification: H01M,Y02E,Y02P

Abstract:
1. A secondary battery, comprising: an electrode assembly having a positive electrode plate, a negative electrode plate, and a separator interposed between the positive and negative electrode plates; a can having at least one groove portion at an inner surface thereof, the electrode assembly being inserted into the can through an opening of the can to face the inner surface of the can, the opening being defined by an upper-most edge of the can; a cap assembly configured to seal the opening of the can; and an insulation case positioned in the can between the electrode assembly and the cap assembly, the insulation case including, a base portion, at least one support portion extending from the base portion, and at least one protruding portion extending respectively from an upper-most edge of the at least one support portion, spaced apart from the base portion along a vertical direction to be in different planes, and inserted into the groove portion of the can, wherein the groove portion of the can extends from the upper-most edge of the can to a predetermined depth along a vertical direction, the groove portion being in the form of a recess in the inner surface of the can and at only a part of a horizontal perimeter of the can, the at least one protruding portion of the insulation case filling the groove portion to have the upper-most edge of the can coplanar with a top of the at least one protruding portion.