Secondary battery

1. A secondary battery comprising:

an electrode assembly comprising a first electrode plate, a separator, and a second electrode plate;

a first collecting plate electrically coupled to the first electrode plate;

a second collecting plate electrically coupled to the second electrode plate;

a case having an opening for receiving the electrode assembly, the first collecting plate, and the second collecting plate;

a first electrode terminal electrically coupled to the first collecting plate;

a second electrode terminal electrically coupled to the second collecting plate;

a first plate electrically coupled to the first collecting plate and the first electrode plate and configured to seal the case by covering substantially entire said opening of the case;

a second plate coupled to the second collecting plate and the second electrode terminal; and

an insulation plate between the first plate and the second plate,

wherein the second electrode terminal is welded to the second plate at a location near a first end of the second plate, and a collecting plate hole is formed at a location near a second end of the second plate opposite the first end, and

wherein the first collecting plate is inserted in the collecting plate hole.

2. The secondary battery as claimed in claim 1 , wherein the insulation plate comprises a material selected from the group consisting of polyphenylene sulfide (PPS), polyethylene (PE), polypropylene (PP), polybutylene terephthalate (PBT), polyamide (PA), and combinations thereof.

3. The secondary battery as claimed in claim 1 , wherein the first electrode terminal is welded to the first plate at a location near a first end of the first plate, and a first hole is formed at a location near a second end of the first plate opposite the first end.

4. The secondary battery as claimed in claim 3 , wherein the second electrode terminal is inserted in the first hole.

5. The secondary battery as claimed in claim 1 , wherein the first plate comprises aluminum.

6. The secondary battery as claimed in claim 1 , wherein the second electrode terminal is inserted in a first hole formed in the first plate at a location near an end of the first plate and a first hole formed in the insulation plate at a location near an end of the insulation plate.

7. The secondary battery as claimed in claim 6 , wherein a protrusion is formed around the first hole of the insulation plate, and the protrusion is inserted through the first hole of the first plate.

8. The secondary battery as claimed in claim 1 , wherein the first collecting plate is inserted through a collecting plate hole formed in the insulation plate at a location near an end of the insulation plate and the collecting plate hole formed in the second plate.

9. The secondary battery as claimed in claim 1 , wherein the second plate comprises copper.

10. The secondary battery as claimed in claim 1 , wherein the first collecting plate and the first plate are welded together.

11. The secondary battery as claimed in claim 1 , wherein the second collecting plate and the second plate are welded together.

12. The secondary battery as claimed in claim 1 , further comprising:

a safety vent in the first plate between the first electrode terminal and a first hole of the first plate;

an alignment hole in the second plate between the second electrode terminal and the collecting plate hole of the second plate; and

a third hole in the insulation plate between first and second holes of the insulation plate,

wherein the safety vent, the alignment hole of the second plate, and the third hole of the insulation plate have corresponding sizes.

13. The secondary battery as claimed in claim 12 , further comprising:

an electrolyte injection hole in the first plate between the safety vent and the first electrode terminal of the first plate;

between hole in the second plate between the collecting plate hole and the alignment hole of the second plate; and

a fourth hole in the insulation plate between the second and third holes of the insulation plate,

wherein the electrolyte injection hole, the between hole of the second plate, and the fourth hole of the insulation plate have corresponding sizes.

14. A secondary battery comprising:

an electrode assembly comprising a first electrode plate, a separator, and a second electrode plate;

a first collecting plate electrically coupled to the first electrode plate;

a second collecting plate electrically coupled to the second electrode plate;

a case containing the electrode assembly, the first collecting plate, and the second collecting plate;

a first electrode terminal electrically coupled to the first collecting plate;

a second electrode terminal electrically coupled to the second collecting plate;

a first plate coupled to the first collecting plate and the first electrode plate and configured to seal the case;

a second plate coupled to the second collecting plate and the second electrode terminal; and

an insulation plate between the first plate and the second plate,

wherein the second electrode terminal is welded to the second plate at a location near a first end of the second plate, and a second hole is formed at a location near a second end of the second plate opposite the first end, and the first collecting plate is inserted in the second hole.

15. A secondary battery comprising:

an electrode assembly comprising a first electrode plate, a separator, and a second electrode plate;

a first collecting plate electrically coupled to the first electrode plate;

a second collecting plate electrically coupled to the second electrode plate;

a case containing the electrode assembly, the first collecting plate, and the second collecting plate;

a first electrode terminal electrically coupled to the first collecting plate;

a second electrode terminal electrically coupled to the second collecting plate;

a first plate coupled to the first collecting plate and the first electrode plate and configured to seal the case;

a second plate coupled to the second collecting plate and the second electrode terminal;

an insulation plate between the first plate and the second plate;

a safety vent in the first plate between the first electrode terminal and a first hole of the first plate;

a third hole in the second plate between the second electrode terminal and a second hole of the second plate; and

a third hole in the insulation plate between first and second holes of the insulation plate,

wherein the safety vent, the third hole of the second plate, and the third hole of the insulation plate have corresponding sizes.

16. The secondary battery as claimed in claim 15 , further comprising:

an electrolyte injection hole in the first plate between the safety vent and the first electrode terminal of the first plate;

a fourth hole in the second plate between the second and third holes of the second plate; and

a fourth hole in the insulation plate between the second and third holes of the insulation plate,

wherein the electrolyte injection hole, the fourth hole of the second plate, and the fourth hole of the insulation plate have corresponding sizes.