Patent ID: 7000297

Claim:
A current collector, which comprises: a) a substrate comprising at least one frame conductor providing a closed perimeter with an extending tab; b) a plurality of first openings uniformly spaced interior of the frame conductor in a first region of the substrate extending from the tab to a first transition; c) a plurality of second openings uniformly spaced interior of the frame conductor in a second region of the substrate extending from the first transition, wherein except for single openings that are only at a perimeter position intermediate one of the first and second openings located immediately adjacent to the frame conductor in each of the first and second regions, everyone of the first openings is larger than everyone of the second openings; and d) wherein there are n regions of openings from the tab to a farthest portion of the frame conductor perimeter with the openings in each region being uniformly spaced from each other and being smaller than everyone of the openings in the immediately preceding region toward the tab except for those openings located at the perimeter position immediately adjacent to the frame conductor in each of the n regions.