Secondary battery

1. A secondary battery, comprising:

an electrode assembly;

a case accommodating the electrode assembly;

a cap plate sealing the case;

a conductive terminal plate on the cap plate;

a current collecting terminal penetrating through the cap plate and the conductive terminal plate, the current collecting terminal being coupled with a top surface of the conductive terminal plate and being electrically connected to the electrode assembly;

a reinforcing plate coupled with a bottom surface of the conductive terminal plate to face the conductive terminal plate, the conductive terminal plate being electrically connected to the current collecting terminal; and

an insulation member between the cap plate and the reinforcing plate,

wherein the conductive terminal plate includes:

a main body facing the reinforcing plate; and

at least one combining unit protruding from the main body, the at least one combining unit penetrating through the reinforcing plate and including a flange structure that contacts a top surface of the insulation member.

2. The secondary battery as claimed in claim 1 , wherein the reinforcing plate has a plate shape.

3. The secondary battery as claimed in claim 1 , wherein the reinforcing plate includes a metal different from a metal that constitutes the conductive terminal plate.

4. The secondary battery as claimed in claim 1 , wherein the current collecting terminal:

penetrates through, in an order as follows: the cap plate, the reinforcing plate, and the conductive terminal plate, and

includes a portion that is exposed on the top surface of the conductive terminal plate.

5. The secondary battery as claimed in claim 1 , wherein an upper end portion of the current collecting terminal includes a flange structure that expands in a lateral direction and press-contacts the top surface of the conductive terminal plate.

6. The secondary battery as claimed in claim 5 , wherein the flange structure is formed by riveting the upper end portion of the current collecting terminal.

7. The secondary battery as claimed in claim 1 , wherein the combining unit:

protrudes toward the bottom surface of the reinforcing plate via the penetration hole of the reinforcing plate.

8. The secondary battery as claimed in claim 7 , wherein the flange structure is formed by riveting the combining unit of the conductive terminal plate.

9. The secondary battery as claimed in claim 1 , wherein the conductive terminal plate includes at least two combining units, the at least two combining units being formed at different locations on the conductive terminal plate.

10. A secondary battery, comprising:

an electrode assembly;

a case accommodating the electrode assembly;

a cap plate sealing the case;

a conductive terminal plate on the cap plate;

a current collecting terminal penetrating through the cap plate and the conductive terminal plate, the current collecting terminal being coupled with a top surface of the conductive terminal plate and being electrically connected to the electrode assembly;

a reinforcing plate coupled with a bottom surface of the conductive terminal plate to face the conductive terminal plate;

a connecting terminal on the reinforcing plate, the connecting terminal penetrating through the conductive terminal plate and including a portion that is exposed on the top surface of the conductive terminal plate; and

an insulation member between the cap plate and the reinforcing plate,

wherein the conductive terminal plate includes:

a main body facing the reinforcing plate; and

at least one combining unit protruding from the main body, the at least one combining unit penetrating through the reinforcing plate and contacting a top surface of the insulation member.

11. The secondary battery as claimed in claim 10 , wherein an upper end portion of the connecting terminal protruding from the top surface of the conductive terminal plate includes a spiral groove for screw attachment.

12. The secondary battery as claimed in claim 10 , wherein the connecting terminal is formed of a same metal as that of the reinforcing plate.

13. The secondary battery as claimed in claim 10 , wherein the connecting terminal is integrated with the reinforcing plate as a single body.

14. The secondary battery as claimed in claim 1 , wherein the current collecting terminal:

penetrates through the conductive terminal plate,

press-contacts the top surface of the conductive terminal plate, and

is coupled with the conductive terminal plate.

15. The secondary battery as claimed in claim 1 , wherein the reinforcing plate is interposed between the conductive terminal plate and the cap plate.

16. The secondary battery as claimed in claim 1 , wherein:

the reinforcing plate is assembled from below the conductive terminal plate, and

the combining unit protruding from the bottom surface of the conductive terminal plate penetrates through the reinforcing plate and combines the reinforcing plate and the conductive terminal plate to each other.

17. The secondary battery as claimed in claim 1 , wherein the insulation member surrounds side surfaces of an interface between the reinforcing plate and the conductive terminal plate.