Current collector for an electromechanical cell

1. A battery comprising:

a housing comprising a first end and a second end;

a cell element disposed within the housing;

a vent member coupled to the first end of the housing; and

a current collector disposed in the first end of the housing, comprising:

an inner member coupled to the vent member;

an outer member coupled to the cell element; and

a plurality of flexible arms extending between the inner member and the outer member and configured to allow the inner member to move relative to the outer member, wherein at least a portion of each arm of the plurality of flexible arms is arcuate from the inner member toward the outer member.

2. The battery of claim 1 , wherein each arm has a spiral shape about the inner member.

3. The battery of claim 1 , wherein the plurality of flexible arms are rotationally symmetric.

4. The battery of claim 3 , wherein the plurality of flexible arms comprise a degree of rotational symmetry in a range of 90 degrees to 180 degrees.

5. The battery of claim 1 , wherein the plurality of flexible arms are configured to allow the inner member to move in a direction relative to the outer member, wherein the direction comprises both an axial component along an axis of the current collector and a circumferential component about the axis.

6. The battery of claim 5 , wherein a portion of the plurality of flexible arms is welded to the cell element, defining a first weld line, the inner member is welded to the vent member, defining a second weld line, and wherein the first and second weld lines skew when the inner member moves in the direction.

7. The battery of claim 1 , wherein the outer member is generally annular and the inner member is generally circular.

8. The battery of claim 1 , wherein each arm of the plurality of flexible arms increases in width from the inner member toward the outer member.

9. The battery of claim 8 , wherein each arm is continuously arcuate from the inner member toward the outer member.

10. The battery of claim 1 , wherein each of the plurality of flexible arms comprises a straight portion coupled to the arcuate portion.

11. The battery of claim 1 , wherein the current collector comprises a plurality of open spaces disposed between the plurality of flexible arms and the inner member.

12. The battery of claim 1 , wherein the current collector does not have reflective symmetry.

13. The battery of claim 1 , wherein the current collector has point symmetry about the inner member.