Electrode assembly having protection tape and rechargeable battery including the same

Patent metadata

Field	Value
Publication number	US-2016149221-A1
Application number	US-201514945075-A
Country	US
Kind code	A1
Filing date	Nov 18, 2015
Priority date	Nov 25, 2014
Publication date	May 26, 2016
Grant date	—

Abstract

An electrode assembly and a rechargeable battery that can prevent an active material from separating and prevent a short circuit and damage due to a tab that is attached to a current collector are provided.
The electrode assembly includes a positive electrode, a negative electrode, and a separator that is disposed between the positive electrode and the negative electrode. The positive electrode has a positive electrode coating portion in which a positive electrode active material layer is formed and a positive electrode uncoated region in which a positive electrode active material layer is not formed, and a positive electrode tab is attached to the positive electrode uncoated region. A first positive electrode protection tape is attached to the positive electrode uncoated region, and the first positive electrode protection tape includes a first cover that covers the side end of the positive electrode coating portion and a second cover that is extended from the first cover and that covers both the positive electrode tab and the positive electrode uncoated region.

First claim

What is claimed is:

1 . An electrode assembly comprising a positive electrode, a negative electrode, and a separator that is disposed between the positive electrode and the negative electrode,
wherein the positive electrode has a positive electrode coating portion in which a positive electrode active material layer is formed and a positive electrode uncoated region in which a positive electrode active material layer is not formed, and a positive electrode tab is attached to the positive electrode uncoated region, a first positive electrode protection tape is attached to the positive electrode uncoated region, and the first positive electrode protection tape comprises a first cover that covers the side end of the positive electrode coating portion and a second cover that is extended from the first cover and that covers both the positive electrode tab and the positive electrode uncoated region.

2 . The electrode assembly of claim 1 , wherein the first cover is located at the positive electrode coating portion side based on a boundary line of the positive electrode uncoated region and the positive electrode coating portion, and the second cover is located at the positive electrode uncoated region side based on the boundary line.

3 . The electrode assembly of claim 1 , wherein an area of the second cover is three times to six times greater than that of the first cover.

4 . The electrode assembly of claim 1 , wherein the positive electrode comprises a positive electrode current collector that is formed with a thin metal plate and a positive electrode active material layer that is attached to a positive electrode current collector, and the positive electrode active material layer is formed at both surfaces of the positive electrode current collector,
the first positive electrode protection tape comprises a first surface that covers one side surface of the positive electrode, a second surface that is bent from the first surface to cover the side end of the positive electrode, and a third surface that is bent from the second surface to cover the other side surface, which is an opposite surface of the one side surface, and the first surface covers the positive electrode tab and the side end of a positive electrode coating portion that is formed at one side surface of the positive electrode, and the third surface covers the side end of a positive electrode coating portion that is formed at the other side surface of the positive electrode and a portion in which the positive electrode tab and the positive electrode current collector are welded.

5 . The electrode assembly of claim 4 , wherein the first positive electrode protection tape comprises a tab cover that is protruded in a length direction of the positive electrode tab, and the tab cover encloses a positive electrode tab that is protruded from the positive electrode current collector.

6 . The electrode assembly of claim 1 , wherein the positive electrode comprises a positive electrode current collector that is formed with a thin metal plate and a positive electrode active material layer that is attached to the positive electrode current collector, and the positive electrode active material layer is formed at both surfaces of the positive electrode current collector,
the first positive electrode protection tape is attached to one surface of the positive electrode, and a second positive electrode protection tape is attached to the other surface of the positive electrode, and the second positive electrode protection tape comprises a third cover that covers the side end of the positive electrode coating portion and a fourth cover that is extended from the third cover and that covers a portion in which the positive electrode tab and the positive electrode current collector are welded.

7 . The electrode assembly of claim 1 , wherein the negative electrode has a negative electrode coating portion in which a negative electrode active material layer is formed and a negative electrode uncoated region in which a negative electrode active material layer is not formed, and a negative electrode tab is attached to the negative electrode uncoated region,
a first negative electrode protection tape is attached to the negative electrode uncoated region, and the first negative electrode protection tape comprises a first cover that covers the side end of the negative electrode coating portion and a second cover that is extended from the first cover and that covers both the negative electrode tab and the negative electrode uncoated region.

8 . A rechargeable battery, comprising:
an electrode assembly comprising a positive electrode, a negative electrode, and a separator that is disposed between the positive electrode and the negative electrode; a case that receives the electrode assembly; and a cap plate that is coupled to the case and in which a terminal that is electrically connected to the electrode assembly is installed, wherein the positive electrode has a positive electrode coating portion in which a positive electrode active material layer is formed and a positive electrode uncoated region in which a positive electrode active material layer is not formed, and a positive electrode tab is attached to the positive electrode uncoated region, a first positive electrode protection tape is attached to the positive electrode uncoated region, and the first positive electrode protection tape comprises a first cover that covers the side end of the positive electrode coating portion and a second cover that is extended from the first cover and that covers both the positive electrode tab and the positive electrode uncoated region.

9 . The rechargeable battery of claim 8 , wherein the first cover is located at the positive electrode coating portion side based on a boundary line of the positive electrode uncoated region and the positive electrode coating portion, and the second cover is located at the positive electrode uncoated region side based on the boundary line.

10 . The rechargeable battery of claim 8 , wherein an area of the second cover is three times to six times greater than that of the first cover.

11 . The rechargeable battery of claim 8 , wherein the positive electrode comprises a positive electrode current collector that is formed with a thin metal plate and a positive electrode active material layer that is attached to the positive electrode current collector, and the positive electrode active material layer is formed at both surfaces of the positive electrode current collector,
the first positive electrode protection tape comprises a first surface that covers one side surface of the positive electrode, a second surface that is bent from the first surface to cover the side end of the positive electrode, and a third surface that is bent from the second surface to cover the other side surface, which is an opposite surface of the one side surface, and the first surface covers the positive electrode tab and the side end of a positive electrode coating portion that is formed at one side surface of the positive electrode, and the third surface covers the side end of a positive electrode coating portion that is formed at the other side surface of the positive electrode and a portion in which the positive electrode tab and the positive electrode current collector are welded.

12 . The rechargeable battery of claim 11 , wherein the first positive electrode protection tape comprises a tab cover that is protruded in a length direction of the positive electrode tab, and the tab cover encloses a positive electrode tab that is protruded from the positive electrode current collector.

13 . The rechargeable batt

Assignees

• Samsung Sdi Co Ltd

Inventors

• Choi Hyun-Jin

Classifications

• H01M50/536

  characterised by the method of fixing the leads to the electrodes, e.g. by welding · CPC title

• H01M50/534

  characterised by the material of the leads or tabs · CPC title

• H01M10/0431 Primary

  Cells with wound or folded electrodes (H01M10/045 takes precedence) · CPC title

• H01M50/538 Primary

  Connection of several leads or tabs of wound or folded electrode stacks · CPC title

• H01M4/70

  characterised by shape or form · CPC title