Secondary battery

1. A secondary battery comprising:

an electrode assembly;

a collector plate electrically connected to the electrode assembly and having a bottom surface support portion facing a bottom surface of the electrode assembly, a connecting portion coupled to the bottom surface and facing a side surface of the electrode assembly, and a side surface support portion protruding from the connecting portion toward the side surface of the electrode assembly, wherein the bottom surface of the collector plate is at an angle to the side surface of the electrode assembly; and

a case surrounding the electrode assembly and the collector plate, the case having a bottom portion and a side portion at an angle to the bottom portion,

wherein the bottom surface support portion of the collector plate is between the bottom surface of the electrode assembly and the bottom portion of the case, and

wherein the side surface support portion is between the side surface of the electrode assembly and the side portion of the case.

2. The secondary battery of claim 1 , wherein a surface of the bottom surface support portion facing a bottom surface of the electrode assembly is shaped to correspond to the bottom surface of the electrode assembly.

3. The secondary battery of claim 1 , wherein the bottom surface support portion extends in parallel with the bottom surface of the electrode assembly from a lower end of the side surface support portion to the electrode assembly.

4. The secondary battery of claim 1 , wherein the electrode assembly includes a plurality of electrode assemblies, and the side surface support portion is located between a plurality of electrode uncoated portions of neighboring electrode assemblies of the electrode assemblies to face the side surfaces of respective ones of the neighboring electrode assemblies.

5. The secondary battery of claim 4 , wherein the side surfaces of the electrode assemblies are planar.

6. The secondary battery of claim 1 , further comprising a cap assembly including a cap plate sealing a top opening of the case and an electrode terminal penetrating the cap plate.

7. The secondary battery of claim 6 , wherein the collector plate comprises:

a terminal connecting portion located between an upper portion of the electrode assembly and a lower portion of the cap assembly; and

a top surface support portion adjacent to one side of the terminal connecting portion.

8. The secondary battery of claim 7 , wherein the top surface support portion comprises:

an extending surface extending from one end of the terminal connecting portion toward the upper portion of the electrode assembly; and

supporting surfaces extending from the extending surface in a direction substantially parallel with the top surface of the electrode assembly.

9. The secondary battery of claim 8 , wherein a surface of the supporting surfaces that faces the top surface of the electrode assembly is shaped to correspond to the top surface of the electrode assembly.

10. The secondary battery of claim 7 , wherein the collector plate further comprises a plurality of connecting portions extending between the top surface support portion and the bottom surface support portion from opposing sides of the terminal connecting portion.

11. The secondary battery of claim 10 , wherein the connecting portions are welded to a plurality of electrode uncoated portions of the electrode assembly.

12. The secondary battery of claim 1 , wherein the collector plate is spaced apart from an inner wall of the case.

13. The secondary battery of claim 1 , wherein the side surface of the electrode assembly is an uncoated portion of the electrode assembly and the bottom surface of the electrode assembly is a coated portion of the electrode assembly.