There is provided an electrode assembly. The electrode assembly includes a stack of unit cells respectively including at least one negative electrode and at least one positive electrode, alternately stacked, wherein at least one separator is placed on each of both sides of the electrodes, and at lea
There is provided an electrode assembly. The electrode assembly includes a stack of unit cells respectively including at least one negative electrode and at least one positive electrode, alternately stacked, wherein at least one separator is placed on each of both sides of the electrodes, and at least one of the unit cells has an area different from that of an adjacent unit cell to form at least one stepped portion on the electrode assembly. In addition, there are also provided a battery cell, a battery pack, and a device that include the electrode assembly.
대표청구항▼
1. An electrode assembly comprising a stack of unit cells, each of the unit cells comprising at least one negative electrode and at least one positive electrode, alternately stacked in a stacking direction, wherein at least one separator is located on each of both sides of the electrodes, andat leas
1. An electrode assembly comprising a stack of unit cells, each of the unit cells comprising at least one negative electrode and at least one positive electrode, alternately stacked in a stacking direction, wherein at least one separator is located on each of both sides of the electrodes, andat least one of the unit cells has an area different from that of an adjacent one of the unit cells to define a first stepped portion of the electrode assembly,the electrode assembly further comprising at least one single electrode having negative or positive polarity, the single electrode disposed along an upper surface or a lower surface of the electrode assembly in the stacking direction, such that the single electrode is adjacent to a first one of the unit cells, and the single electrode having an area different from that of the first unit cell so as to define a second stepped portion of the electrode assembly. 2. The electrode assembly of claim 1, wherein the unit cells comprise at least one of a stacked/folded type unit cell, a jelly-roll type unit cell, a laminated and stacked type unit cell, and a combination thereof. 3. The electrode assembly of claim 2, wherein at least one negative electrode; least one positive electrode; a unit cell in which at least one positive electrode and at least one negative electrode are stacked with a separator interposed therebetween; or a combination thereof is arranged on at least one rectangular separator, and the stacked/folded type unit cell is formed by folding the at least one rectangular separator. 4. The electrode assembly of claim 2, wherein the stacked/folded type unit cell, the jelly-roll type unit cell, the laminated stacked type unit cell, or a combination thereof comprises the first stepped portion. 5. The electrode assembly of claim 1, wherein the at least one of the unit cells and the unit cell adjacent thereto have mutually-facing electrodes, and one of the mutually-facing electrodes having a relatively large area is a negative electrode. 6. The electrode assembly of claim 1, wherein the negative electrode has an active material coated area which is greater than an active material coated area of the positive electrode. 7. The electrode assembly of claim 1, wherein at least one of the electrodes located along the upper and lower surfaces of the electrode assembly in the stacking direction of the unit cells is a negative electrode or a single-side-coated positive electrode having a non-coated side facing outward. 8. The electrode assembly of claim 1, wherein the negative and positive electrodes comprise electrode tabs, respective and electrode tabs having the same polarity are electrically connected to each other. 9. The electrode assembly of claim 8, wherein the electrode tabs of the negative and positive electrodes are attached to the same side or different sides of the electrode assembly, and electrode tabs having the same polarity are attached to the same sides of the electrodes. 10. The electrode assembly of claim 8, wherein the electrode tabs have the same size or different sizes. 11. The electrode assembly of claim 1, wherein at least one of the unit cells has a corner shaped differently from the other corners thereof. 12. The electrode assembly of claim 1, wherein at least one of the unit cells has at least one curved corner. 13. The electrode assembly of claim 12, wherein the at least one of the unit cells has two or more curved corners, and the curved corners have the same curvature or different curvatures. 14. The electrode assembly of claim 12, wherein each of two or more of the unit cells has at least one curved corner, and at least one of the curved corners has a curvature different from that of the other curved corners. 15. The electrode assembly of claim 1, wherein at least one of neighboring electrodes of the electrode, assembly is disposed on an adjacent electrode thereof within a boundary of the neighboring electrode. 16. The electrode assembly of claim 1, wherein areas of the unit cells decrease in the stacking direction of the unit cells. 17. The electrode assembly of claim 1, wherein the unit cells are stacked in a manner such that corners of the unit cells are aligned in a line. 18. The electrode assembly of claim 1, wherein the unit cells are stacked in a manner such that centers of the unit cells are aligned in a line. 19. The electrode assembly of claim 1, wherein the unit cells have the same thickness or different thicknesses. 20. A battery cell comprising: the electrode assembly of claim 1; anda battery case accommodating the electrode assembly. 21. The battery cell of claim 20, wherein the battery case is a pouch type case. 22. The battery cell of claim 21, wherein the battery case has a stepped or inclined portion corresponding to a shape of the electrode assembly. 23. The battery cell of claim 20, wherein the battery cell is a lithium ion secondary battery cell or lithium ion polymer secondary battery cell. 24. A device comprising at least one battery cell as claimed in claim 20. 25. The device of claim 24, wherein a system component of the device is disposed in a remaining space of the battery cell. 26. The device of claim 24, wherein the device is a cellular phone, a portable computer, a smartphone, a smartpad, a net book, an 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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이 특허에 인용된 특허 (3)
Cohen Frederic S. (Lexington MA) Hyland Albert L. (Wayland MA), Multiple duty battery.
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