Patent ID: 8986875
Filing Date: 2015-03-24
Classification: H01M,Y02E

Abstract:
1. A battery pack, comprising: a bare cell comprising a cap plate having a first surface having at least one screw receiving groove, the cap plate comprising a protruding unit formed on a second surface of the cap plate in correspondence to the position of the screw receiving groove of the cap plate; a cover case disposed at a side of the cap plate and comprising a surface with at least one mounting groove and a hole at approximately the center of the mounting groove; and at least one tapping screw comprising a head part and a body part, the head part is mounted in the mounting groove of the cover case and the body part penetrates the hole and is coupled to the screw receiving groove of the cap plate, when the tapping screw fixes the cover case to the cap plate, and the screw receiving groove of the cap plate has a depth so as to have a space between a lower end surface of the body part of the tapping screw and a bottom surface of the screw receiving groove of the cap plate and the lower end surface of the first tapping screw is coupled not to exceed the thickness of the cap plate, and an inner circumferential surface of the screw receiving groove comprising a projection such that an inscribed circle that is tangent to both of the inner circumferential surface and the projection being greater than the inside diameter of the body part of the tapping screw and being less than the outside diameter of the body part of the tapping screw.