Patent ID: 8741487

Claim:
A current collector, comprising: a) a frame conductor having a closed perimeter comprising a repeating sequence of a concave undulation extending to and meeting with a convex undulation; b) a node at either an interior location inside the frame conductor or connected to the frame conductor; and c) at least a first radial strut and a second radial strut, both the first and second radial struts comprising a proximal radial strut end connected to the node and a distal radial strut end connected to the frame conductor, d) wherein the closed perimeter is expandable such that in an unexpanded state, the distal ends of the first and second radial struts are spaced apart by a first distance and in an expanded state, the distal ends of the first and second radial struts are spaced apart by a second distance that is greater than the first distance.