Cap assembly and secondary battery using the same
A cap assembly for a secondary battery in which an insulating member is disposed in a partial or entire terminal plate, resulting in improved stability. The cap assembly includes a terminal plate and an insulating member. The insulating member is disposed in a partial or entire region of the terminal plate other than a region to which a negative electrode tab is welded.
1. A cap assembly for a secondary battery, comprising:
a terminal plate within the cap assembly;
an insulating member disposed in a partial or an entire region of the terminal plate other than a region to which an electrode tab is welded; and
an insulating plate disposed between a cap plate having a terminal hole and the terminal plate.
2. The cap assembly according to claim 1 , wherein the insulating member is coated with poly-ethylene or poly-ethylene-terephthalate.
3. The cap assembly according to claim 1 , wherein the insulating member comprises an insulating tape attached thereon.
4. A secondary battery, comprising:
an electrode assembly including a negative electrode tab and a positive electrode tab;
a can for accommodating the electrode assembly, the can including an upper opening; and
a cap assembly for finishing the upper opening, wherein
the cap assembly comprises a terminal plate within the cap assembly;
an insulating member disposed in a partial or an entire region of the terminal plate other than a region to which the negative electrode tab is welded; and
an insulating plate disposed between a cap plate having a terminal hole and the terminal plate.
5. The secondary battery according to claim 4 , wherein the insulating member is coated with poly-ethylene or poly-ethylene-terephthalate.
6. The secondary battery according to claim 4 , wherein the insulating member comprises an insulating tape attached thereon.
7. The secondary battery according to claim 4 , wherein the can has a prismatic shape or an elliptical shape with rounded edges.
8. The secondary battery according to claim 7 , wherein the can is formed of aluminum, aluminum alloy, or stainless steel.
9. The secondary battery according to claim 4 , wherein the secondary battery further comprises:
a protecting circuit board disposed at one side thereof.
10. The secondary battery according to claim 4 , wherein the secondary battery is of an inner pack type.
11. The secondary battery according to claim 4 , wherein the secondary battery is of a hard pack type.
12. A secondary battery, comprising:
an electrode assembly including a negative electrode tab connected to a negative electrode plate, a positive electrode tab connected to a positive electrode plate, and a separator disposed between the negative electrode plate and the positive electrode plate;
a can for accommodating the electrode assembly, the can including an upper opening; and
a cap assembly enclosing the upper opening, wherein
the cap assembly, comprises:
a terminal plate within the cap assembly; and
an insulating member disposed in a partial or an entire region of the terminal plate other than a region to which the negative electrode tab is welded; and
an insulating plate disposed between a cap plate having a terminal hole and the terminal plate.
13. The secondary battery recited in claim 12 , wherein the separator has a porous film structure having a plurality of holes.
14. The secondary battery recited in claim 13 , wherein the separator is composed of a thermoplastic resin.
15. The secondary battery recited in claim 14 , wherein upon an internal temperature of the secondary battery exceeding a melting point of the thermoplastic resin, said plurality of holes are sealed preventing current flow in the secondary battery.
16. The secondary battery recited in claim 12 , wherein upon distortion of the cap assembly due to an external force the conductive terminal plate is prevented from contacting the electrode assembly by the insulating member and short-circuiting the secondary battery.
17. The cap assembly according to claim 1 , wherein the cap assembly further comprises:
an insulating gasket coupled with the terminal hole and having a central hole; and
an electrode terminal coupled with the central hole,
wherein the insulating member surrounds or encases an edge of the terminal plate.
18. The cap assembly according to claim 4 , wherein the cap assembly further comprises:
an insulating gasket coupled with the terminal hole and having a central hole; and
an electrode terminal coupled with the central hole,
wherein the insulating member surrounds or encases an edge of the terminal plate.
19. The cap assembly according to claim 12 , wherein the cap assembly further comprises:
an insulating gasket coupled with the terminal hole and having a central hole; and
an electrode terminal coupled with the central hole,
wherein the insulating member surrounds or encases an edge of the terminal plate.