Patent ID: 7722992

Claim:
A current collector for an electrical energy storage device, the current collector comprising: a) a first major face; b) a second major face; c) a peripheral edge between the first and second major faces, wherein the peripheral edge comprises at least a first edge portion contiguous with a second edge portion angled with respect to each other; and d) a protrusion extending outwardly from the junction of the first and second edge portions, wherein a first protrusion portion resides between a first imaginary extension of the first edge portion of the current collector and a perimeter of the protrusion and a second protrusion portion resides between a second imaginary extension of the second edge portion of the current collector and the protrusion perimeter so that a first distance from the first imaginary extension to a first distant-most tangent of the protrusion perimeter furthest from the first imaginary extension edge is substantially equal to a second distance from the second imaginary extension to a second distant-most tangent of the protrusion perimeter furthest from the second imaginary extension.