RECHARGEABLE BATTERY

1 . A rechargeable battery, comprising:

at least one electrode assembly, the at least one electrode assembly including a positive electrode and a negative electrode;

a case accommodating the electrode assembly, the case having an installation surface;

a terminal installed on the installation surface of the case; and

a cap member coupled with the case.

2 . The rechargeable battery as claimed in claim 1 , wherein the case has an opening therein, the opening being closed by the cap member in an assembled condition of the rechargeable battery.

3 . The rechargeable battery as claimed in claim 2 , wherein the opening in the case faces the installation surface.

4 . The rechargeable battery as claimed in claim 3 , wherein:

the cap member has a plate shape, and

a thickness of the cap member is smaller than a thickness of the case.

5 . The rechargeable battery as claimed in claim 3 , wherein the cap member includes an electrode support thereon, the electrode support protruding toward the electrode assembly and supporting the electrode assembly.

6 . The rechargeable battery as claimed in claim 5 , wherein the electrode support includes a groove, a lower end of the electrode assembly being accommodated in the groove.

7 . The rechargeable battery as claimed in claim 3 , wherein the cap member includes a cooling protrusion on an outer surface thereof.

8 . The rechargeable battery as claimed in claim 3 , wherein the cap member forms a lower surface of the case, the lower surface of the case being opposite to the installation surface that includes the terminal thereon.

9 . The rechargeable battery as claimed in claim 2 , wherein the opening is on a side of the case perpendicular to the installation surface.

10 . The rechargeable battery as claimed in claim 9 , wherein:

the opening includes a first opening and a second opening, and

the first opening and the second opening face each other at sides of the case.

11 . The rechargeable battery as claimed in claim 2 , wherein the cap member is welded to the case at the opening.

12 . The rechargeable battery as claimed in claim 1 , wherein:

the electrode assembly is wound about a reference axis, and

the electrode assembly is accommodated in the case such that the reference axis is perpendicular to a plane of the cap member.

13 . The rechargeable battery as claimed in claim 12 , wherein the electrode assembly is accommodated in the case such that the reference axis is perpendicular to an opening in the case, the opening being closed by the cap member in an assembled condition of the rechargeable battery.

14 . The rechargeable battery as claimed in claim 1 , wherein the case includes:

a first opening and a second opening, the first opening and the second opening each being perpendicular to the installation surface, and

a third opening facing the installation surface, the first opening and the second opening being at sides of the third opening and facing each other.

15 . The rechargeable battery as claimed in claim 14 , wherein the cap member includes:

a bottom plate coupled with the third opening,

a first side plate bent at one side end of the bottom plate, the first side plate being coupled with the first opening, and

a second side plate bent at another side end of the bottom plate, the second side plate being coupled with the second opening.

16 . The rechargeable battery as claimed in claim 1 , wherein the rechargeable battery includes a plurality of electrode assemblies in the case.