Electrode assembly and secondary battery including the same

Abstract

The present disclosure relates to an electrode assembly and a secondary battery including the same. The electrode assembly according to an embodiment includes a first electrode including a first current collector and a first active material layer on the first current collector. The electrode assembly can further include a second electrode including a second current collector and a second active material layer on the second current collector. A separator is located between the first electrode and the second electrode. The first current collector includes an uncoated portion to which the first active material layer is not provided, and the uncoated portion includes a first region. A second region is between the first region and the first active material layer, the first electrode further includes an insulating member disposed on the second region, and the second region includes at least one open region.

Claims

1. An electrode assembly, comprising: The first electrode includes a first current collector and a first active material layer on the first current collector; The second electrode includes a second current collector and a second active material layer on the second current collector; as well as A diaphragm is located between the first electrode and the second electrode. The second electrode is larger than the first electrode. The first current collector includes an uncoated portion that is not provided with the first active material layer. The uncoated portion includes a first region and a second region between the first region and the first active material layer. The first electrode further includes an insulating member disposed on the second region, and The second region includes at least one open region.

2. The electrode assembly of claim 1, wherein the first electrode further comprises at least one electrode tab formed by slotting the first region.

3. The electrode assembly of claim 2, wherein the at least one opening region extends from one end of the second region toward the first active material layer.

4. The electrode assembly of claim 3, wherein each of the at least one opening region includes a first opening and a second opening. The first opening is formed by removing a portion of the first current collector and a portion of the insulating member, and The second opening is formed by removing a portion of the first current collector and a portion of the first active material layer.

5. The electrode assembly of claim 4, wherein the length of the second opening is shorter than the length of the first opening.

6. The electrode assembly of claim 5, wherein the length of the second opening is 10% to 20% of the length of the first opening.

7. The electrode assembly according to claim 1, wherein the thickness of the insulating member is less than or equal to the thickness of the first active material layer.

8. The electrode assembly of claim 2, wherein the at least one opening region comprises an opening region 1a, an opening region 1b, and an opening region 1c. The 1a opening region is closest to the at least one electrode tab. The 1c opening region is furthest from the at least one electrode terminal piece, and The 1b opening region is located between the 1a opening region and the 1c opening region.

9. The electrode assembly of claim 8, wherein the at least one electrode tab comprises two or more electrode tabs, and the 1a opening region is disposed between the two or more electrode tabs.

10. The electrode assembly of claim 8, wherein the dimensions of the 1a opening region, the 1b opening region, and the 1c opening region are different.

11. The electrode assembly of claim 8, wherein the size of the 1a opening region is larger than the size of at least one of the 1b opening region and the 1c opening region.

12. The electrode assembly of claim 8, wherein the dimensions of the 1a opening region, the 1b opening region, and the 1c opening region decrease in a direction away from the first electrode tab, such that the dimension of the 1c opening region is the smallest of the dimensions of the 1a opening region, the 1b opening region, and the 1c opening region.

13. The electrode assembly of claim 8, wherein the distance between adjacent opening regions in the 1a opening region, the 1b opening region, and the 1c opening region increases in a direction away from the first electrode tab.

14. The electrode assembly of claim 2, wherein the first electrode has a first end, a second end opposite to the first end, and a third end and a fourth end connecting the first end and the second end, the first end being one end of the second region, and The first electrode further includes an opening region formed in at least one of the second end, the third end, and the fourth end.

15. The electrode assembly of claim 14, wherein the at least one opening region is a 1-1 opening region formed at the first end. One or two opening regions are formed at the second end. A 1-3 opening region is formed at the third end. An opening region of 1-4 is formed at the fourth end, and The size of the 1-1 opening region is greater than the size of at least one of the 1-2 opening region, the 1-3 opening region, and the 1-4 opening region.

16. The electrode assembly of claim 1, wherein the uncoated portion further comprises a third region. The first region and the second region extend in the width direction of the first electrode. The third region extends along the length of the first electrode. The insulating member disposed in the second region is the first insulating member, and The second insulating component is disposed on the third region.

17. The electrode assembly of claim 16, wherein the first electrode has a first end, a second end opposite to the first end, and a third end and a fourth end connecting the first end and the second end, the first end being one end of the second region. The third end is one end of the third region, and The first electrode further includes an opening region formed at the third end.

18. The electrode assembly of claim 17, wherein the first electrode further includes an opening region formed in at least one of the second end and the fourth end.

19. The electrode assembly of claim 1, wherein the second electrode includes at least one opening region, and The at least one opening region of the second electrode is smaller than the at least one opening region of the first electrode.

20. A secondary battery, comprising: case; as well as The electrode assembly according to any one of claims 1 to 19 is housed in the housing.

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