Rechargeable secondary battery having improved safety against puncture and collapse
Disclosed is a secondary battery having improved safety against puncture and collapse. The secondary battery includes an electrode assembly including a first electrode, a second electrode, and a separator between the first electrode and the second electrode, a case receiving the electrode assembly, a cap plate coupled to the case, and a support plate electrically coupled to the first and second electrodes of the electrode assembly, the support plate being disposed between the electrode assembly and the case.
1. A rechargeable battery comprising:
a case;
an electrode assembly housed in the case and having a first substantially planar surface and a second substantially planar surface, wherein the electrode assembly comprises a first electrode, a second electrode and a separator between the first and second electrodes, wherein the first electrode has a coating portion coated with an active material and a non-coating portion absent the active material and being bent at an angle from the coating portion;
a plurality of terminals extending from the case; and
a support plate between the electrode assembly and the case, the support plate comprising:
a first conductive plate having a substantially planar portion generally adjacent to and overlapping at least one of the substantially planar surfaces of the electrode assembly and a first angled section being bent at an angle from the substantially planar portion and generally adjacent to and overlapping the non-coating portion; and
a second conductive plate having a substantially planar portion generally adjacent to and overlapping the substantially planar portion of the first conductive plate, wherein the first and second conductive plates are entirely spaced from the terminals, and wherein the non-coating portion is located between the first conductive plate and one of the terminals.
2. The rechargeable battery of claim 1 , further comprising an insulation plate between the first conductive plate and the second conductive plate.
3. The rechargeable battery of claim 1 , wherein the non-coating portion is welded to the first conductive plate.
4. The rechargeable battery of claim 1 , wherein the first conductive plate has a first attachment region generally adjacent to and overlapping the non-coating portion of the first electrode.
5. The rechargeable battery of claim 4 , wherein the first attachment region extends from the first angled section.
6. The rechargeable battery of claim 1 , wherein the first conductive plate and the non-coating portion comprise the same material.
7. The rechargeable battery of claim 1 , wherein the second electrode has a coating portion coated with an active material and a non-coating portion absent the active material and being bent at an angle from the coating portion and wherein the second conductive plate is electrically coupled to the second electrode at the non-coating portion of the second electrode.
8. The rechargeable battery of claim 7 , wherein the second conductive plate has a second angled section being bent at an angle from the substantially planar portion and a second attachment portion both generally adjacent to and overlapping the non-coating portion of the second electrode.
9. The rechargeable battery of claim 1 , further comprising a first electrode terminal electrically coupled to the electrode assembly, the first electrode terminal comprising a welding portion that extends into the electrode assembly.
10. The rechargeable battery of claim 1 , wherein the support plate comprises metal.
11. The rechargeable battery of claim 10 , wherein the metal comprises aluminum or copper.
12. The rechargeable battery of claim 1 , wherein the first conductive plate and the second conductive plate comprise different materials.
13. The rechargeable battery of claim 12 , wherein the first conductive plate comprises aluminum and the second conductive plate comprises copper.
14. The rechargeable battery of claim 1 , further comprising an additional support plate electrically coupled to another one of the substantially planar surfaces of the electrode assembly.
15. The rechargeable battery of claim 14 , further comprising an additional electrode assembly electrically coupled to the additional support plate.
16. The rechargeable battery of claim 1 , wherein a thickness of each of the first conductive plate and the second conductive plate is between about 50 μm and about 400 μm.
17. The rechargeable battery of claim 1 , wherein a thickness of the first conductive plate is different from a thickness of the second conductive plate.