Patent ID: 9136538
Filing Date: 2015-09-15
Classification: H01M,Y02E,Y02P

Abstract:
1. A rechargeable battery, comprising: an electrode assembly including first and second electrode plates, each of which includes an electrode uncoated portion, and a separator interposed between the first and second electrode plates, the electrode assembly having a winding direction; and two current collector plates, each current collector plate contacting one of the electrode uncoated portions of the first and second electrode plates, wherein each current collector plate includes: a base portion comprising a center and a perimeter edge, a first protrusion protruding toward the electrode assembly from the base portion and having a first contact portion contacting one of the electrode uncoated portions, and a first slit in the first contact portion, the first slit being disposed at approximately a right angle with respect to the winding direction of the electrode assembly, and extending radially toward and open to the perimeter edge, and a planar welding portion at the center and protruding away from the electrode assembly, an upper surface of the planar welding portion being planar at a center thereof.