There is provided an electrode assembly having steps including: a first electrode stair including at least one first electrode unit; and a second electrode stair including at least one second electrode unit having an area different from that of the first electrode unit, wherein the first electrode s
There is provided an electrode assembly having steps including: a first electrode stair including at least one first electrode unit; and a second electrode stair including at least one second electrode unit having an area different from that of the first electrode unit, wherein the first electrode stair and the second electrode stair are stacked to be adjacent, separated by at least one separator as a boundary therebetween and including one or more electrode laminates having steps formed by a difference between areas of the first electrode stair and the second electrode stair, and shapes of the corners of the first electrode stair and the second electrode stair having steps are different. There is also provided a secondary battery including the electrode assembly. Secondary batteries having various designs without restriction in shapes of corners of electrode units can be provided.
대표청구항▼
1. An electrode having an asymmetric structure, comprising: a planar sheet of material having a first end and an opposed second end, anda tab extending away from the first end of the planar sheet,wherein the planar sheet has a generally rectangular perimeter, with at least one corner of the perimete
1. An electrode having an asymmetric structure, comprising: a planar sheet of material having a first end and an opposed second end, anda tab extending away from the first end of the planar sheet,wherein the planar sheet has a generally rectangular perimeter, with at least one corner of the perimeter having an asymmetric structure with respect to a central axis normal to the planar sheet,wherein the planar sheet extends along a length direction, extends along a width direction, defines a maximum length along the length direction, and defines first and second linear edges spaced apart along the width direction, each of the first and second linear edges being shorter than the maximum length,wherein the first and second linear edges each include a first endpoint adjacent the first end of the planar sheet and a second endpoint adjacent the second end of the planar sheet,wherein the perimeter of the planar sheet at the first and second endpoints of each of the first and second linear edges extends toward the opposing linear edge in a direction substantially parallel to the width direction, andwherein a depth of the first endpoints measured from the first end of the planar sheet is smaller than a depth of the second endpoints measured from the second end of the planar sheet. 2. The electrode of claim 1, wherein the tab extends along the length direction away from the one end of the planar sheet. 3. An electrode having an asymmetric structure, comprising: a planar sheet of material having a first end, an opposed second end, and a generally rectangular perimeter, with at least one corner of the perimeter having an asymmetric structure with respect to a central axis normal to the electrode,wherein the electrode extends along a length direction, extends along a width direction, defines a maximum length along the length direction, and defines first and second linear edges spaced apart along the width direction, each of the first and second linear edges being shorter than the maximum length,wherein the first and second linear edges each include a first endpoint adjacent the first end of the planar sheet and a second endpoint adjacent the second end of the planar sheet,wherein the perimeter of the electrode at the first and second endpoints of each of the first and second linear edges first extends toward the opposing linear edge in a first direction substantially parallel to the width direction, and then extends in a second direction that is angled with respect to the first direction, andwherein a depth of the first endpoints measured from the first end of the planar sheet is smaller than a depth of the second endpoints measured from the second end of the planar sheet. 4. An electrode having an asymmetric structure, comprising: a planar sheet of material having a first end, an opposed second end, and a generally rectangular perimeter including four edges and four corners each connecting a pair of the edges, each corner having a notched perimeter extending inward from the edges toward a central axis normal to the electrode, at least one of the notched perimeters having an asymmetric structure with respect to the central axis different from the asymmetric structure of another one of the notched perimeters,wherein the electrode extends along a length direction, extends along a width direction, defines a maximum length along the length direction, and defines first and second linear edges spaced apart along the width direction, each of the first and second linear edges being shorter than the maximum length,wherein the first and second linear edges each include a first endpoint adjacent the first end of the planar sheet and a second endpoint adjacent the second end of the planar sheet,wherein the perimeter of the electrode at the first and second endpoints of each of the first and second linear edges extends toward the opposing linear edge in a direction substantially parallel to the width direction, andwherein a depth of the first endpoints measured from the first end of the planar sheet is smaller than a depth of the second endpoints measured from the second end of the planar sheet. 5. The electrode of claim 4, wherein the first linear edge extends between the notched perimeters of two adjacent corners. 6. The electrode of claim 1, wherein the perimeter of the planar sheet at the first and second endpoints of each of the first and second linear edges includes linear portions extending toward the opposing linear edge. 7. The electrode of claim 6, wherein the first and second endpoints of each of the first and second linear edges form corners between the respective linear edges and the respective linear portions. 8. The electrode of claim 7, wherein the angle of each of the corners is about ninety degrees. 9. An electrode assembly comprising: a first electrode stair including at least one first electrode unit; anda second electrode stair including at least one second electrode unit having an area different from that of the first electrode unit,wherein the first electrode stair and the second electrode stair are stacked to be adjacent, separated by at least one separator as a boundary therebetween and including one or more electrode laminates having steps formed by a difference between the areas of the first electrode stair and the second electrode stair,shapes of corners of the first electrode stair and the second electrode stair are different,wherein at least one of the electrode units is the electrode according to claim 1. 10. The electrode assembly of claim 9, wherein at least one of the first and second electrode stairs forming the electrode laminate has a rounded corner forming a step. 11. The electrode assembly of claim 9, wherein the first electrode stair and the second electrode stair forming the electrode laminate have rounded corners forming steps, and curvatures of the rounded corners are different. 12. The electrode assembly of claim 9, wherein, in the electrode laminate, the first electrode stair and the second electrode stair share at least two sides and three corners. 13. The electrode assembly of claim 9, wherein, in the electrode laminate, the first electrode stair and the second electrode stair share at least two sides and two corners. 14. The electrode assembly of claim 9, wherein, in the electrode laminate, the first electrode stair and the second electrode stair share at least one side and two corners. 15. The electrode assembly of claim 9, wherein, in the electrode laminate, the first electrode stair and the second electrode stair share at least one side and one corner. 16. The electrode assembly of claim 9, wherein, in the electrode laminate, the first electrode stair and the second electrode stair share at least one corner. 17. The electrode assembly of claim 9, wherein, in the electrode laminate, the first electrode stair and the second electrode stair share only a portion of one side. 18. The electrode assembly of claim 9, wherein, in the electrode laminate, the first electrode stair is stacked within a surface of the second electrode stair, and all the sides and corners have steps. 19. The electrode assembly of claim 9, wherein, in the electrode laminate, the first electrode stair shares at least two sides of the second electrode stair, and has steps in all the sides and corners. 20. The electrode assembly of claim 9, wherein, in the electrode laminate, the electrode units are stacked such that the areas thereof are reduced in a height direction in which the electrode units are stacked. 21. The electrode assembly of claim 9, wherein, in the electrode laminate, one of mutually adjacent electrode units is included within a stacked surface of the other electrode unit. 22. The electrode assembly of claim 9, wherein the electrode units have electrode tabs corresponding to respective electrodes and the respective sizes of the electrode tabs are equal or different. 23. The electrode assembly of claim 22, wherein the electrode tabs are attached to one end portion of the electrode unit or facing end portions of the electrode unit. 24. The electrode assembly of claim 9, wherein the electrode unit is independently selected from the group including a negative electrode, a positive electrode, and a unit cell alternately stacked with at least one negative electrode and at least one positive electrode with a separator interposed therebetween. 25. The electrode assembly of claim 24, wherein the unit cell is selected from the group consisting of a jelly roll-type unit cell, a stacked-type unit cell, and a stacked-and-folded-type unit cell. 26. The electrode assembly of claim 25, wherein the unit cell includes at least one step. 27. The electrode assembly of claim 9, wherein, facing electrodes of the electrode unit and the adjacent electrode unit having different areas which face each other with the separator interposed therebetween as a boundary have different polarities. 28. The electrode assembly of claim 27, wherein a facing electrode of an electrode unit having a larger area, between the electrode unit and the adjacent electrode unit having different areas, is a negative electrode. 29. A secondary battery, wherein the electrode assembly of claim 9 is received in a battery case. 30. A device comprising one or more secondary batteries of claim 29. 31. The device of claim 30, wherein a system component of the device is positioned in a surplus space of the secondary battery. 32. The secondary battery of claim 30, wherein the device is a portable phone, a portable computer, a smart phone, a smart pad, a net book, a light electronic vehicle (LEV), an electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle, or a power storage device.
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