Patent ID: 8877369

Claim:
A secondary battery, comprising: a case having a lengthwise direction and including a space therein; an electrode assembly disposed in the space in the case, the electrode assembly including a rolled laminate of a positive electrode plate, a negative electrode plate, and a separator interposed therebetween and having non-coating portions at ends thereof; a pair of current collectors, each current collector being electrically connected to one of the non-coating portions of the electrode assembly, each current collector including a current collector plate having an end portion, each end portion extending along the lengthwise direction of the case such that the end portions of the current collector plates of the pair of current collectors are spaced apart from each other in a central region in the lengthwise direction of the case; and a cap plate coupled to a top of the case to seal the case, the cap plate having a vent disposed therein at a position corresponding to the end portions of the current collector plates, wherein the end portions of the current collector plates are disposed underneath the vent, the end portions of the current collector plates being spaced apart from the cap plate by a gap, a dimension of the gap being sufficiently small that the end portions of the current collector plates contact the cap plate when the vent is opened.