Electrode assembly including bi-cell and full-cell and secondary battery including the same

1. An electrode assembly configured to have a structure in which a plurality of unit cells, each of which comprises a positive electrode having an electrode mixture comprising an electrode active material applied to a current collector, a negative electrode having an electrode mixture comprising an electrode active material applied to a current collector, and a separator disposed between the positive electrode and the negative electrode, is wound in a state of being arranged on a sheet type separation film, wherein

the unit cells comprise one full cell and three or more bi-cells,

outermost unit cells of the electrode assembly are each configured such that an electrode forming an outside of the electrode assembly is configured as a single-sided electrode, in which no electrode mixture is applied to a surface of the current collector facing the outside of the electrode assembly,

the single-sided electrodes are electrodes having the same polarity, and

the unit cells are wound in a state in which the unit cells are sequentially arranged in a plane from a first unit cell, which is located at a winding start point of the separation film, to a 2n-th unit cell (where n is an integer that satisfies 2≤n≤20), which is located at a winding end point of the separation film, and

the three or more bi-cells configured as an A-type bi-cell or a C-type bi-cell are alternatingly stacked, and the one full cell is disposed as one of the outermost unit cells.

2. The electrode assembly according to claim 1 , wherein the full cell is a first full cell, which is configured to have a structure in which a first positive electrode, configured as a single-sided positive electrode, a separator, and a negative electrode are sequentially stacked, or a second full cell, which is configured to have a structure in which a first negative electrode, configured as a single-sided negative electrode, a separator, and a positive electrode are sequentially stacked, the first positive electrode or the first negative electrode facing the separation film.

3. The electrode assembly according to claim 1 , wherein the A-type bi-cell, which is configured to have a structure in which a positive electrode, a negative electrode, and another positive electrode are sequentially stacked in a state in which separators are disposed therebetween, a and the C-type bi-cell, which is configured to have a structure in which a negative electrode, a positive electrode, and another negative electrode are sequentially stacked in a state in which separators are disposed therebetween.

4. The electrode assembly according to claim 3 , wherein the A-type bi-cell comprises a 1A-type bi-cell, which is configured to have a structure in which a first positive electrode, configured as a single-sided positive electrode, a negative electrode, and a positive electrode are sequentially stacked in a state in which separators are disposed therebetween, or a 2A-type bi-cell, which is configured to have a structure in which a positive electrode, a negative electrode, and another positive electrode are sequentially stacked in a state in which separators are disposed therebetween.

5. The electrode assembly according to claim 3 , wherein the C-type bi-cell comprises a 1C-type bi-cell, which is configured to have a structure in which a first negative electrode, configured as a single-sided negative electrode, a positive electrode, and a negative electrode are sequentially stacked in a state in which separators are disposed therebetween, or a 2C-type bi-cell, which is configured to have a structure in which a negative electrode, a positive electrode, and another negative electrode are sequentially stacked in a state in which separators are disposed therebetween.

6. The electrode assembly according to any one of claims 2 to 5 , wherein the first unit cell is a bi-cell, the 2n-th unit cell is a 1A-type bi-cell, and a (2n−1)-th unit cell is a first full cell.

7. The electrode assembly according to any one of claims 2 to 5 , wherein the first unit cell is a bi-cell, the 2n-th unit cell is a 1C-type bi-cell, and a (2n−1)-th unit cell is a second full cell.

8. The electrode assembly according to any one of claims 2 to 5 , wherein the first unit cell is a bi-cell, the 2n-th unit cell is a first full cell, and a (2n−1)-th unit cell is a 1A-type bi-cell.

9. The electrode assembly according to any one of claims 2 to 5 , wherein the first unit cell is a bi-cell, the 2n-th unit cell is a second full cell, and a (2n−1)-th unit cell is a 1C-type bi-cell.

10. The electrode assembly according to claim 1 , wherein the single-sided electrode is a first positive electrode.

11. The electrode assembly according to claim 1 , wherein the single-sided electrode is a first negative electrode.

12. A secondary battery comprising an electrode assembly according to claim 1 mounted in a battery case.

13. The secondary battery according to claim 12 , wherein the battery case is a pouch-shaped case made of an aluminum laminate sheet or a can-shaped case.

14. A battery pack comprising a secondary battery according to claim 13 as a unit cell.

15. A device comprising a battery pack according to claim 14 as a power source.

16. The device according to claim 15 , wherein the device is a mobile electronic device, a power tool driven by a battery-powered motor, an electric automobile, such as such as an electric vehicle (EV), a hybrid electric vehicle (HEV), or a plug-in hybrid electric vehicle (PHEV), an electric two-wheeled vehicle, such as an electric bicycle (E-bike) or an electric scooter (E-scooter), an electric golf cart, or a power storage system.