Electrode assembly and rechargeable battery including the same
An electrode assembly and a rechargeable battery including the same, the electrode assembly including a first electrode, a second electrode, and a separator interposed therebetween, wherein the first electrode, the second electrode, and the separator are spiral-wound in a jelly-roll structure, the first electrode includes at least two first uncoated regions separated from each other and a first tab coupled to one of the first uncoated regions and a second tab coupled to another of the first uncoated regions, the first tab and the second tab protruding from one side of the jelly-roll structure, the first tab is disposed near a center of the jelly-roll structure and the second tab is disposed near an outer circumference of the jelly-roll structure, and a width of the first tab is smaller than a width of the second tab.
1. An electrode assembly, comprising:
a first electrode,
a second electrode, and
a separator interposed therebetween,
wherein:
the first electrode, the second electrode, and the separator are spiral-wound in a jelly-roll structure,
the first electrode includes at least two first uncoated regions separated from each other by a coating region and includes a first tab on one of the first uncoated regions and a second tab on another of the first uncoated regions, the first tab and the second tab protruding from one side of the jelly-roll structure,
the first tab is disposed at a center portion of the jelly-roll structure and the second tab is disposed closer to an outer circumference of the jelly-roll structure than the first tab,
a width of the first tab is smaller than a width of the second tab, and
a thickness of the first tab in a radial direction is smaller than a thickness of the second tab in the radial direction.
2. The electrode assembly as claimed in claim 1 , wherein:
the first electrode has a band shape, and
the two first uncoated regions are disposed on end edges of the first electrode.
3. The electrode assembly as claimed in claim 1 , wherein:
the first electrode has a band shape, and
the one of the first uncoated regions is on a center portion of the first electrode and the other of the first uncoated regions is on an end edge of the first electrode.
4. The electrode assembly as claimed in claim 1 , wherein the width of the first tab equals 2πr×0.065, r being a radius of the bottom surface of the jelly-roll structure.
5. The electrode assembly as claimed in claim 1 , wherein the width of the first tab is about 2.8 mm to about 7 mm.
6. The electrode assembly as claimed in claim 1 , wherein the width of the second tab equals 2πr×0.07, r being a radius of the bottom surface of the jelly-roll structure.
7. The electrode assembly as claimed in claim 1 , wherein the width of the second tab is about 5.1 mm to about 11 mm.
8. The electrode assembly as claimed in claim 1 , wherein the thickness of the first tab is about 0.05 mm to about 0.15 mm.
9. The electrode assembly as claimed in claim 1 , wherein the thickness of the second tab is about 0.1 mm to about 0.2 mm.
10. The electrode assembly as claimed in claim 1 , wherein the first electrode is a positive electrode.
11. The electrode assembly as claimed in claim 1 , wherein:
the second electrode includes at least two second uncoated regions separated from each other by another coating region and includes a third tab on one of the second uncoated regions and a fourth tab on another of the second uncoated regions, the third tab and the fourth tab protruding to a side opposite to the one side from which the first tab and the second tab protrude,
the third tab is disposed at a center portion of the jelly-roll structure and the fourth tab is disposed closer to an outer circumference of the jelly-roll structure than the third tab, and
a width of the third tab is smaller than a width of the fourth tab.
12. The electrode assembly as claimed in claim 11 , wherein the width of the third tab equals 2πr×0.065, r being a radius of the bottom surface of the jelly-roll structure.
13. The electrode assembly as claimed in claim 11 , wherein the width of the fourth tab equals 2πr×0.07, r being a radius of the bottom surface of the jelly-roll structure.
14. A rechargeable battery, comprising:
an electrode assembly, the electrode assembly including a first electrode, a second electrode, and a separator interposed therebetween;
a case for receiving the electrode assembly, and
a cap assembly coupled with the case and electrically connected to the electrode assembly,
wherein:
the first electrode, the second electrode, and the separator are spiral-wound in a jelly-roll structure having a cylindrical shape,
the first electrode includes at least two first uncoated regions separated from each other by a coating region and includes a first tab coupled to one of the first uncoated regions and a second tab coupled to another of the first uncoated regions, the first tab and the second tab protruding from one side of the jelly-roll structure,
the first tab is disposed at a center portion of the jelly-roll structure and the second tab is disposed closer to an outer circumference of the jelly-roll structure than the first tab,
a width of the first tab is smaller than a width of the second tab, and
a thickness of the first tab in a radial direction is smaller than a thickness of the second tab in the radial direction.
15. The rechargeable battery as claimed in claim 14 , wherein:
the width of the first tab equals 2πr×0.065,
the width of the second tab equals 2πr×0.07, and
r is a radius of a bottom surface of the jelly-roll structure.
16. The rechargeable battery as claimed in claim 14 , wherein:
the width of the first tab is about 2.8 mm to about 7 mm, and
the width of the second tab is about 5.1 mm to about 11 mm.
17. The rechargeable battery as claimed in claim 14 , wherein
the second electrode includes at least two second uncoated regions separated from each other by another coating region and includes a third tab on one of the second uncoated regions and a fourth tab on another of the second uncoated regions, the third tab and the fourth tab protruding to a side opposite to the one side from which the first tab and the second tab protrude, and
the third tab is disposed at a center portion of the jelly-roll structure and the fourth tab is disposed closer to an outer circumference of the jelly-roll structure than the third tab, and
a width of the third tab is smaller than a width of the fourth tab.
18. The rechargeable battery as claimed in claim 17 , wherein:
the width of the third tab equals 2πr×0.065,
the width of the fourth tab equals 2πr×0.07, and
r is a radius of a bottom surface of the jelly-roll structure.
19. The rechargeable battery as claimed in claim 17 , wherein a thickness of the third tab is smaller than a thickness of the fourth tab.