Electrode assembly including electrode units having the same width and different lengths, and battery cell and device including the electrode assembly
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There are provided an electrode assembly, a battery cell including the electrode assembly, and a device including the electrode assembly. The electrode assembly includes a combination of two or more electrode units having the same width and different lengths, wherein the electrode units are stacked
There are provided an electrode assembly, a battery cell including the electrode assembly, and a device including the electrode assembly. The electrode assembly includes a combination of two or more electrode units having the same width and different lengths, wherein the electrode units are stacked so that a stepped portion is formed between the electrode units, and electrodes having different polarities face each other at an interface between the electrode units.
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1. An electrode assembly comprising a combination of two or more electrode units having the same width and different lengths, wherein the electrode units are stacked so that a stepped portion is formed between the electrode units,a positive electrode and a negative electrode face each other at an in
1. An electrode assembly comprising a combination of two or more electrode units having the same width and different lengths, wherein the electrode units are stacked so that a stepped portion is formed between the electrode units,a positive electrode and a negative electrode face each other at an interface between the electrode units,wherein each of the electrode units is selected from the group consisting of a single electrode, a stacked type unit cell, a jelly-roll type unit cell, a stacked and folded type unit cell, and any combination thereof, andthe electrode assembly satisfies Formula 1-2 to prevent swelling: 1≦Nn/Pn≦Nn/Pn+1≦1.2 Formula 1-2:where n denotes an integer equal to or greater than 1,Nn denotes reversible capacity per unit area of a negative electrode of the nth longest electrode unit,Pn denotes reversible capacity per unit area of a positive electrode of the nth longest electrode unit, andPn+1 denotes reversible capacity per unit area of a positive electrode of the (n+1)th longest electrode unit. 2. The electrode assembly of claim 1, wherein at the interface between the electrode units having the same width and different lengths, a negative electrode of a relatively long electrode unit faces a positive electrode of a relatively short electrode unit. 3. The electrode assembly of claim 1, wherein after 500 charging and discharging cycles at 25° C. under a charging condition (A) and a discharging condition (B), the electrode assembly has 60% or more of an electrical capacity measured after one charging and discharging cycle, and an overall thickness of the electrode assembly is varied by 15% or less as compared with an overall thickness measured after one charging and discharging cycle, wherein in the charging condition (A), the electrode assembly is charged to a voltage of 4.2 V or 4.35 V at 1C rate in a constant current mode, and a current is supplied to the electrode assembly in a constant voltage mode until the current reaches 1/20 of a battery minimal capacity, andin the discharging condition (B), the electrode assembly is discharged at 1C rate to a voltage of 3 V in a constant current mode. 4. The electrode assembly of claim 1, wherein the electrode assembly satisfies Formula 2: Nn/Pn≦Nn/Pn+1≦Nn+1/Pn+1≦Nn+1/Pn+2 Formula 2:where n denotes an integer equal to or greater than 1,Nn denotes the reversible capacity per unit area of the negative electrode of the nth longest electrode unit,Nn+1 denotes reversible capacity per unit area of a negative electrode of the (n+1)th longest electrode unit,Pn denotes the reversible capacity per unit area of the positive electrode of the nth longest electrode unit,Pn+1 denotes the reversible capacity per unit area of the positive electrode of the (n+1)th longest electrode unit, andPn+2 denotes reversible capacity per unit area of a positive electrode of the (n+2)th longest electrode unit. 5. The electrode assembly of claim 4, wherein the electrode assembly satisfies Formula 2-1: 1≦Nn/Pn≦Nn/Pn+1≦Nn+1/Pn+1≦Nn+1/Pn+2 Formula 2-1:where n denotes an integer equal to or greater than 1,Nn denotes the reversible capacity per unit area of the negative electrode of the nth longest electrode unit,Nn+1 denotes the reversible capacity per unit area of the negative electrode of the (n+1)th longest electrode unit,Pn denotes the reversible capacity per unit area of the positive electrode of the nth longest electrode unit,Pn+1 denotes the reversible capacity per unit area of the positive electrode of the (n+1)th longest electrode unit, andPn+2 denotes the reversible capacity per unit area of the positive electrode of the (n+2)th longest electrode unit. 6. The electrode assembly of claim 4, wherein the (n+2)th longest electrode unit is disposed between the nth longest electrode unit and the (n+1)th longest electrode unit, wherein the electrode assembly satisfies Formula 3: Nn/Pn+2≦Nn+1/Pn+2 Formula 3:where n denotes an integer equal to or greater than 1,Nn denotes the reversible capacity per unit area of the negative electrode of the nth longest electrode unit,Nn+1 denotes the reversible capacity per unit area of the negative electrode of the (n+1)th longest electrode unit, andPn+2 denotes the reversible capacity per unit area of the positive electrode of the (n+2)th longest electrode unit. 7. The electrode assembly of claim 1, wherein the electrode assembly satisfies Formula 4: dNn/dPn≦dNn/dPn+1 Formula 4:where n denotes an integer equal to or greater than 1,dNn denotes a thickness of the negative electrode of the nth longest electrode unit,dPn denotes a thickness of the positive electrode of the nth longest electrode unit, anddPn+1 denotes a thickness of the positive electrode of the (n+1)th longest electrode unit. 8. The electrode assembly of claim 1, wherein the electrode assembly satisfies Formula 4-1: 0.5≦dNn/dPn≦dNn/dPn+1≦2 Formula 4-1:where n denotes an integer equal to or greater than 1,dNn denotes a thickness of the negative electrode of the nth longest electrode unit,dPn+1 denotes a thickness of the positive electrode of the nth longest electrode unit, anddPn+1 denotes a thickness of the positive electrode of the (n+1)th longest electrode unit. 9. The electrode assembly of claim 1, wherein the electrode assembly satisfies Formula 5: dNn/dPn≦dNn/dPn+1≦dNn+1/dPn+1≦dNn+1/dPn+2 Formula 5:where n denotes an integer equal to or greater than 1,dNn denotes a thickness of the negative electrode of the nth longest electrode unit,dNn+1 denotes a thickness of a negative electrode of the (n+1)th longest electrode unit,dPn denotes a thickness of the positive electrode of the nth longest electrode unit, anddPn+1 denotes a thickness of the positive electrode of the (n+1)th longest electrode unit, anddPn+2 denotes a thickness of a positive electrode of the (n+2)th longest electrode unit. 10. The electrode assembly of claim 1, wherein the electrode assembly satisfies Formula 5-1: 0.5≦dNn/dPn≦dNn/dPn+1≦dNn+1/dPn+1≦dNn+1/dPn+2≦2 Formula 5-1:wheren denotes an integer equal to or greater than 1,dNn denotes a thickness of the negative electrode of the nth longest electrode unit,dNn+1 denotes a thickness of a negative electrode of the (n+1)th longest electrode unit,dPn denotes a thickness of the positive electrode of the nth longest electrode unit, anddPn+1 denotes a thickness of the positive electrode of the (n+1)th longest electrode unit, anddPn+2 denotes a thickness of a positive electrode of the (n+2)th longest electrode unit. 11. The electrode assembly of claim 9, wherein the (n+2)th longest electrode unit is disposed between the nth longest electrode unit and the (n+1)th longest electrode unit, wherein the electrode assembly satisfies Formula 6: dNn/dPn+2≦dNn+1/dPn+2 Formula 6:where n denotes an integer equal to or greater than 1,dNn denotes the thickness of the negative electrode of the nth longest electrode unit,dNn+1 denotes the thickness of the negative electrode of the (n+1)th longest electrode unit, anddPn+2 denotes the thickness of the positive electrode of the (n+2)th longest electrode unit. 12. The electrode assembly of claim 1, wherein the electrode assembly comprises three or more kinds of electrode units having different lengths, wherein a ratio of reversible capacity per unit area of a negative electrode to reversible capacity per unit area of a positive electrode facing the negative electrode at an interface between the electrode units is 1 or is increased as contact areas between the electrode units are decreased. 13. The electrode assembly of claim 1, wherein at least one unit cell includes at least one positive electrode, at least one negative electrode, and at least one separator. 14. The electrode assembly of claim 1, wherein electrodes and unit cells of the electrode units are partially or entirely surrounded by at least one long sheet of separation film. 15. The electrode assembly of claim 13, wherein electrodes disposed on both outermost sides of the unit cell have the same polarity. 16. The electrode assembly of claim 13, wherein electrodes disposed on both outermost sides of the unit cell have different polarities. 17. The electrode assembly of claim 1, wherein each of the electrode units has a rectangular sectional shape, a rectangular sectional shape having at least one curved corner, or a sectional shape having at least one curved side. 18. The electrode assembly of claim 1, wherein the electrode units have the same sectional shape. 19. The electrode assembly of claim 1, wherein the electrode units comprise one or more electrode tabs, and the electrode tabs are stacked in such a manner that electrode tabs of the same polarity are overlapped with each other. 20. The electrode assembly of claim 19, wherein the electrode tabs have different sizes. 21. The electrode assembly of claim 1, wherein the electrode units are arranged in such a manner that the lengths of the electrode units decrease in a direction from a lower side to an upper side of the electrode assembly. 22. The electrode assembly of claim 1, wherein the electrode units are arranged in such a manner that the lengths of the electrode units increase in a direction from a lower side to an upper side of the electrode assembly. 23. The electrode assembly of claim 1, wherein the longest electrode unit of the electrode units is disposed in a middle layer of the electrode assembly. 24. The electrode assembly of claim 1, wherein the electrode units are arranged in such a manner that planar center points of the electrode units are aligned with each other. 25. The electrode assembly of claim 1, wherein the electrode units are arranged in such a manner that planar center points of the electrode units are arranged with predetermined intervals therebetween. 26. The electrode assembly of claim 1, wherein the electrode units are arranged in such a manner that widthwise sides of the electrode units are aligned with each other. 27. A battery cell comprising: the electrode assembly of claim 1 and;a battery case accommodating the electrode assembly. 28. The battery cell of claim 27, wherein the battery case is a pouch type case. 29. The battery cell of claim 27, wherein the battery case has a shape corresponding to a shape of the electrode assembly. 30. The battery cell of claim 27, wherein the battery cell is a lithium ion secondary battery or a lithium ion polymer secondary battery. 31. A device comprising at least one battery cell as claimed in claim 27. 32. The device of claim 31, wherein a system component of the device is disposed in a remaining space of the battery cell. 33. The device of claim 32, wherein the device is a cellular phone, a portable computer, a smartphone, a smartpad, a net book, an LEV (light electronic vehicle), an electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle, or a power storage device. 34. The electrode assembly of claim 1, wherein two of the electrode units are different ones selected from the group consisting of the single electrode, the stacked type unit cell, the jelly-roll type unit cell, the stacked and folded type unit cell, and any combination thereof.
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이 특허에 인용된 특허 (3)
Kim Chang Seob,KRX, Electrode assembly having a reliable capacity ratio between negative and positive active materials and battery having the same.
Kwon, Sung-Jin; Ahn, Soon-Ho; Kim, Dong-Myung; Kim, Ki-Woong; Kim, Young-Hoon; Yoon, Sung-Han; Ryu, Seung-Min, Stepped electrode assembly having predetermined a thickness ratio in the interface between electrode units, battery cell and device comprising the same.
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