Patent ID: 8841021

Claim:
A secondary battery, comprising: a can for accommodating an electrode assembly, the can having an opening at one side thereof; a cap assembly for sealing the opening of the can; an insulation case between the electrode assembly and the cap assembly, the insulation case including a lower surface that is above the electrode assembly and a sidewall extending vertically upwardly from the lower surface, the insulation case being in a force-fitted state within a space at an upper portion of the can defined by an interior wall of the can, the lower surface of the insulation case having a size in a horizontal cross-section prior to force fitting that is larger than the space defined by the interior wall of the can; and an insertion guide on the insulation case, the insertion guide having: a flat vertical face parallel to the sidewall of the insulation case and to the interior wall of the can, the vertical face being positioned at an upper region of the sidewall of the insulation case such that a lower region of the sidewall is between the insertion guide and the lower surface of the insulation case, the lower region of the sidewall having a surface parallel to the flat vertical face of the insertion guide and parallel to the interior wall of the can; and an inclined lower portion facing the can, the inclined lower portion extending between the lower region of the sidewall and the flat vertical face of the insertion guide, the inclined lower portion being inclined at a predetermined angle relative to the sidewall of the insulation case and to the vertical face of the insertion guide such that a thickness of the insertion guide increases between the lower region of the sidewall and the flat vertical face of the insertion guide in a direction away from the lower surface of the insulation case.