Stepped electrode assembly having predetermined a reversible capacitance ratio in the interface between electrode units, battery cell and device comprising the same
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There are provided an electrode assembly, and a battery cell, a battery pack, and a device. The electrode assembly includes a combination of two or more types of electrode units having different areas, wherein the electrode units are stacked such that steps are formed, and electrode units are formed
There are provided an electrode assembly, and a battery cell, a battery pack, and a device. The electrode assembly includes a combination of two or more types of electrode units having different areas, wherein the electrode units are stacked such that steps are formed, and electrode units are formed such that a positive electrode and a negative electrode face one another at an interface between the electrode units.
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1. An electrode assembly comprising a combination of two or more types of electrode unit having different areas, the two or more types of electrode unit being stacked so as to form a stepped portion therebetween, wherein a positive electrode and a negative electrode are formed to face each other at
1. An electrode assembly comprising a combination of two or more types of electrode unit having different areas, the two or more types of electrode unit being stacked so as to form a stepped portion therebetween, wherein a positive electrode and a negative electrode are formed to face each other at an interface between the electrode units, satisfying following Equation 1-2 so that N/P ratio at the interface is balanced: 1≦Nn/Pn≦Nn/Pn+1≦1.2, Equation 1-2: where n is an integer not less than 1, Nn is reversible capacitance per unit area of the negative electrode of the electrode unit that is the n-th largest in area,Pn is reversible capacitance per unit area of the positive electrode of the electrode unit that is the n-th largest in area, andPn+1 is reversible capacitance per unit area of the positive electrode of the electrode unit that is the (n+1)th largest in area. 2. The electrode assembly according to claim 1, wherein Equation 2-2 is satisfied: 1≦Nn/Pn≦Nn/Pn+1≦Nn+1/Pn+1≦Nn+1/Pn+2≦1.2 Equation 2-2: where n is an integer not less than 1, Nn is reversible capacitance per unit area of a negative electrode of the electrode unit that is the n-th largest in area,Nn+1 is reversible capacitance per unit area of a negative electrode of the electrode unit that is the (n+1)th largest in area,Pn is reversible capacitance per unit area of a positive electrode of the electrode unit that is the n-th largest in area,Pn+1 is reversible capacitance per unit area of the positive electrode of the electrode unit that is the (n+1)th largest in area, andPn+2 is reversible capacitance per unit area of a positive electrode of an electrode unit that is the (n+2)th largest in area. 3. The electrode assembly according to claim 1, wherein the electrode unit that is the (n+2)th largest in area is disposed between the electrode unit that is the n-th largest in area and the electrode unit that is (n+1)th largest in area, and Equation 3 is satisfied, Nn/Pn+2≦Nn+1/Pn+2 Equation 3:where n is an integer not less than 1,Nn is reversible capacitance per unit area of a negative electrode of the electrode unit that is the n-th largest in area,Nn+1 is reversible capacitance per unit area of a negative electrode of the electrode unit that is the (n+1)th largest in area, andPn+2 is reversible capacitance per unit area of a positive electrode of an electrode unit that is the (n+2)th largest in area. 4. The electrode assembly according to claim 1, wherein at the interface between the electrode units having different areas, a negative electrode of an electrode unit having a relatively large area and a positive electrode of an electrode unit having a relatively small area face one another. 5. The electrode assembly according to claim 1, wherein the reversible capacitance per unit area of the negative electrode is a value defined as a charge capacitance of the negative electrode per unit area [mAh/cm2]×efficiency [%] of the negative electrode and the reversible capacitance per unit area of the positive electrode is a value defined as a loaded amount [g/cm2] of a positive electrode active material×a charge capacitance [mAh/g] per unit weight of positive electrode−an irreversible capacitance [mAh] per unit area of negative electrode. 6. The electrode assembly according to claim 1, wherein when 500 charge and discharge cycles have been performed at 25° C. under charging conditions (A) and discharging conditions (B), an electrical capacitance of the electrode assembly is 60% or more of an electrical capacitance after a single charge and discharge cycle, and a total thickness variation ratio of the electrode assembly is 15% or less:charging conditions (A): after a battery is charged to 4.2V or 4.35V in a constant current mode of 1 C, the constant current mode is converted to a constant voltage mode, and charging is completed after current flows until the amount of charged current becomes 1/20 of a minimum capacitance of the battery; anddischarging conditions (B): a discharge current of 1 C flows in the constant current mode, and discharging is completed when the voltage reaches at 3V. 7. The electrode assembly according to claim 1, wherein a ratio of a thickness of the negative electrode to a thickness of the negative electrode facing the positive electrode at the interface between the electrode units is in a range of 0.5 to 2. 8. The electrode assembly according to claim 1, wherein the positive electrode has a porosity in a range of 10% to 30%, and the negative electrode has a porosity in a range of 15% to 50%. 9. The electrode assembly according to claim 1, wherein Equation 4 is satisfied: dNn/dPn≦dNn/dPn+ Equation 4:where n is an integer not less than 1,dNn is a thickness of the negative electrode of the electrode unit that is the n-th largest in area,dPn is a thickness of the positive electrode of the electrode unit that is the n-th largest in area, anddPn+1 is a thickness of the positive electrode of the electrode unit that is the (n+1)th largest in area. 10. The electrode assembly according to claim 9, wherein Equation 4-1 is satisfied: 0.5≦dNn/dPn≦dNn/dPn+1≦2 Equation 4-1:where n is an integer not less than 1,dNn is a thickness of the negative electrode of the electrode unit that is the n-th largest in area,dPn is a thickness of the positive electrode of the electrode unit that is the n-th largest in area, anddPn+1 is a thickness of the positive electrode of the electrode unit that is the (n+1)th largest in area. 11. The electrode assembly according to claim 9, wherein Equation 5 is satisfied: dNn/dPn≦dNn/dPn+1≦dNn+1/dPn+1≦dNn+1/dPn+2 Equation 5: where n is an integer not less than 1, dNn is a thickness of the negative electrode of the electrode unit that is the n-th largest in area,dNn+1 is a thickness of the negative electrode of the electrode unit that is the (n+1)th largest in area,dPn is a thickness of the positive electrode of the electrode unit that is the n-th largest in area,dPn+1 is a thickness of the positive electrode of the electrode unit that is the (n+1)th largest in area, anddPn+2 is a thickness of the positive electrode of the electrode unit that is the (n+2)th largest in area. 12. The electrode assembly according to claim 10, wherein Equation 5-1 is satisfied: 0.5≦Nn/dPn≦dNn/dPn+1≦dNn+1/dPn+1≦dNn+1/dPn+2≦2 Equation 5-1:where n is an integer not less than 1,dNn is a thickness of the negative electrode of the electrode unit that is the n-th largest in area,dNn+1 is a thickness of the negative electrode of the electrode unit that is the (n+1)th largest in area,dPn is a thickness of the positive electrode of the electrode unit that is the n-th largest in area,dPn+1 is a thickness of the positive electrode of the electrode unit that is the (n+1)th largest in area, anddPn+2 is a thickness of the positive electrode of the electrode unit that is the (n+2)th largest in area. 13. The electrode assembly according to claim 11, wherein the electrode unit that is the (n+2)th largest in area is disposed between the electrode unit that is the n-th largest in area and the electrode unit that is (n+1)th largest in area, and Equation 6 is satisfied, dNn/dPn+2≦dNn+1/dPn+2, Equation 6:where n is an integer not less than 1,dNn is a thickness of the negative electrode of the electrode unit that is the n-th largest in area,dNn+1 is a thickness of the negative electrode of the electrode unit that is the (n+1)th largest in area,dPn+1 is a thickness of the positive electrode of the electrode unit that is the (n+1)th largest in area, anddPn+2 is a thickness of the positive electrode of the electrode unit that is the (n+2)th largest in area. 14. The electrode assembly according to claim 1, wherein the ratios of the reversible capacitances per unit area of the negative electrodes to the reversible capacitances per unit area of the positive electrodes facing the negative electrodes at the interface between the electrode units are the same as each other or increase as the contact area between the electrode units is reduced. 15. The electrode assembly according to claim 1, wherein the electrode unit comprises: one or more single electrodes; one or more unit cells including at least one positive electrode, at least one negative electrode, and at least one separator; or any combination thereof. 16. The electrode assembly according to claim 15, wherein the unit cell is selected from the group consisting of a jelly-roll type unit cell, a stacked-type unit cell, a laminated-and-stacked type unit cell and a stacked-and-folded-type unit cell. 17. The electrode assembly according to claim 1, wherein the electrode assembly has a structure in which some or all of the single electrode and the unit cells constituting the electrode units are wrapped with a long sheet-type separation film. 18. The electrode assembly according to claim 15, wherein polarities of electrodes disposed on both outermost surfaces of the unit cell are the same. 19. The electrode assembly according to claim 15, wherein polarities of electrodes disposed on both outermost surfaces of the unit cell are different. 20. The electrode assembly according to claim 1, wherein a section of the electrode unit has a quadrangular shape, a quadrangular-like shape with at least one corner having a curved shape, or a shape with at least one or more sides having a curved shape. 21. The electrode assembly according to claim 1, wherein the electrode assembly includes a combination of electrode units having different sectional shapes. 22. The electrode assembly according to claim 1, wherein the electrode assembly includes a combination of electrode units having the same sectional shape. 23. The electrode assembly according to claim 1, wherein the electrode units include one or more electrode tabs, and the electrode tabs having the same polarity are connected. 24. The electrode assembly of claim 23, wherein the electrode tabs have different sizes. 25. The electrode assembly according to claim 1, wherein the electrode units are stacked to have an arrangement in which the areas of the electrode units are reduced upwardly. 26. The electrode assembly according to claim 1, wherein the electrode units are stacked to have an arrangement in which the areas of the electrode units are increased upwardly. 27. The electrode assembly according to claim 1, wherein the electrode units are stacked such that an electrode unit having the largest area is arranged in a middle layer of the electrode assembly. 28. The electrode assembly according to claim 1, wherein the electrode units are stacked to have an arrangement in which central points of the respective electrode units in the plane direction are consistent. 29. The electrode assembly according to claim 1, wherein the electrode units are stacked to have an arrangement in which the central points of the respective electrode units in the plane direction are spaced apart at certain intervals. 30. The electrode assembly according to claim 1, wherein the electrode units are stacked to have an arrangement in which one corners of the respective electrode units are consistent. 31. The electrode assembly according to claim 1, wherein thicknesses of the respective electrode units are different. 32. A battery cell in which the electrode assembly according to claim 2 is installed in a battery case. 33. The battery cell of claim 32, wherein the battery case is a pouch-type case. 34. The battery cell of claim 32, wherein the battery case is formed to have a shape corresponding to a shape of the electrode assembly. 35. The battery cell of claim 32, wherein the battery cell is a lithium ion secondary battery or a lithium ion polymer secondary battery. 36. A device comprising one or more of the battery cells of claim 32. 37. The device of claim 36, wherein a system component of the device is positioned in surplus space within the battery cell. 38. The device of claim 36, 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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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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