Rechargeable battery including elastic member comprising tapering wall

1. A rechargeable battery, comprising:

an electrode assembly;

a case accommodating the electrode assembly; and

an elastic member between the case and an outer surface of the electrode assembly, wherein the elastic member includes a tapering wall defining a central open area having an axis, the tapering wall having an inclined disposition relative to the axis of the central open area,

wherein:

the electrode assembly includes a positive electrode, a negative electrode, and a separator wound in a jelly roll structure around an axis of the electrode assembly, and

the axis of the central open area is perpendicular to the axis of the electrode assembly.

2. The rechargeable battery as claimed in claim 1 , wherein the elastic member has a loop structure surrounding the central open area.

3. The rechargeable battery as claimed in claim 2 , wherein the loop structure is a closed loop structure.

4. The rechargeable battery as claimed in claim 2 , wherein the central open area has a prismatic shape with rounded corners.

5. The rechargeable battery as claimed in claim 2 , wherein the central open area has an oblong shape with rounded ends and with outwardly extending, finger-like projections.

6. The rechargeable battery as claimed in claim 2 , wherein the central open area has a rounded shape.

7. The rechargeable battery as claimed in claim 1 , wherein the central open area is defined by edges of the wall, the edges of the wall including:

a pair of curved sections having concavities facing one another, and

a pair of straight sections connecting ends of the curved sections.

8. The rechargeable battery as claimed in claim 1 , wherein the central open area is defined by edges of the wall, the edges of the wall including:

four quarter circle sections, and

straight sections connecting ends of the quarter circle sections.

9. The rechargeable battery as claimed in claim 1 , wherein the rechargeable battery includes a plurality of the elastic members between the outer surface of the electrode assembly and the case.

10. The rechargeable battery as claimed in claim 9 , wherein the plurality of elastic members includes an inside elastic member and an outside elastic member, the inside elastic member being between the outside elastic member and the electrode assembly, the outside elastic member being between the case and the inside elastic member, and the plurality of elastic members being stacked in a surface contact configuration such that the tapering walls thereof taper in the same direction.

11. The rechargeable battery as claimed in claim 9 , wherein the plurality of elastic members includes an inside elastic member and an outside elastic member, the inside elastic member being between the outside elastic member and the electrode assembly, the outside elastic member being between the case and the inside elastic member, and the plurality of elastic members being stacked in a line contact configuration such that the tapering walls thereof taper in opposite directions.

12. The rechargeable battery as claimed in claim 1 , wherein the elastic member is elastically biased toward the electrode assembly.

13. The rechargeable battery as claimed in claim 1 , wherein the elastic member has a truncated conical shape formed by the tapering wall.

14. The rechargeable battery as claimed in claim 1 , wherein the wall has one axial end defining a first circumference and another axial end defining a second circumference, the first circumference being different from the second circumference.

15. The rechargeable battery as claimed in claim 1 , wherein the wall tapers inwardly from the case to the electrode assembly.

16. The rechargeable battery as claimed in claim 1 , wherein the tapering wall is movable between a relatively relaxed position and a relatively compressed position, a degree of incline of the tapering wall relative to the axis of the central open area being greater in the relatively compressed position than in the relatively relaxed position.

17. The rechargeable battery as claimed in claim 1 , wherein the central open area is further defined by an inner face of the case and an outer face of the electrode assembly.

18. The rechargeable battery as claimed in claim 1 , wherein the elastic member includes a plate spring.