Patent ID: 8765291

Claim:
A rechargeable battery comprising: an electrode assembly comprising a first electrode plate comprising a plurality of first protrusions extending in a first direction from a first end of the first electrode plate at a first side of an end of the electrode assembly, and a second electrode plate comprising a plurality of second protrusions extending in the first direction from a first end of the second electrode plate at a second side of the end of the electrode assembly opposite the first side, at least one of the plurality of first protrusions or the plurality of second protrusions including a planar portion and a curved portion, the planar portion extending in a length direction from the curved portion toward the other of the plurality of first protrusions or the plurality of second protrusions; a case containing the electrode assembly; a collector plate coupled to protrusions of the at least one of the plurality of first protrusions or the plurality of second protrusions, the collector plate comprising a recessed portion including a surface facing the electrode assembly in a second direction opposite the first direction and being welded to the curved portion, the surface pressing and bending the protrusions to increase a contact area between the surface and the protrusions; and an electrode terminal coupled to the collector plate at a region of the collector plate covering the planar portion.