Patent ID: 8795878

Claim:
A secondary battery, comprising: an electrode assembly; a can including a bottom plate and a sidewall extending from the bottom plate, the can being configured to accommodate the electrode assembly; a cap plate sealing an opening of the can; and an insulating case including a plate-shaped main body facing the electrode assembly and a support part extending from the main body, the insulating case being accommodated in the can, wherein: the support part of the insulating case includes at least one support wall bent from the main body, the at least one support wall includes side surfaces and a top surface between the side surfaces, the can further includes a separation prevention part configured to prevent detachment of the insulating case, the separation prevention part including an inwardly bent extension extending from an upper end of the sidewall and directly the top surface of the at least one support wall and the cap plate is on top of the separation prevention part, such that the separation part is between the cap plate and the insulating case.