SECONDARY BATTERY COMPRISING ANTI-EXPLOSION MEANS

摘要

A secondary battery according to the present invention comprises: an electrode assembly; an exterior case which accommodates the electrode assembly therein; and anti-explosion means including a punching pin, and a frame in which the punching pin is installed in such a way that one side of the punching pin is directed toward an outer surface of the exterior case, wherein the frame is coupled to the exterior case. Thus, when the exterior case expands by an increase in the pressure therein, the exterior case is brought into contact with the punching pin, and a through-hole is formed in the exterior case. The secondary battery of the present invention is configured such that the through-hole is formed in the exterior case when the exterior case expands by the increase in the pressure therein, and the gas in the exterior case is discharged to the outside to prevent explosion thereof. In addition, the protruding length of the punching pin can be adjusted to easily control through-hole forming time, and sharp fractures are prevented from being formed at the secondary battery to protect users from injury.