Secondary battery and electrode member thereof having an electricity generation region with reduced curvature

Patent metadata

Field	Value
Publication number	US-11043677-B2
Application number	US-202017137077-A
Country	US
Kind code	B2
Filing date	Dec 29, 2020
Priority date	Oct 17, 2018
Publication date	Jun 22, 2021
Grant date	Jun 22, 2021

Abstract

The present application relates to a secondary battery and an electrode member thereof. The electrode member includes an insulating substrate, a conducting layer and an active material layer. The conducting layer is provided on a surface of the insulating substrate, and the conducting layer includes a main portion and a protruding portion extending from the main portion, the main portion is coated with the active material layer, the protruding portion is not coated with the active material layer. The active material layer includes a first portion and a second portion, the first portion is positioned at an end of the active material layer away from the protruding portion, the second portion is positioned at a side of the first portion close to the protruding portion, and a thickness of the first portion is less than a thickness of the second portion.

First claim

What is claimed is:

1. An electrode member of a secondary battery, comprising an insulating substrate, a conducting layer and an active material layer;
the conducting layer being provided on a surface of the insulating substrate, and the conducting layer comprising a main portion and a protruding portion extending from the main portion, the main portion being coated with the active material layer, the protruding portion being not coated with the active material layer;
the active material layer comprising a first portion and a second portion, the first portion being positioned at an end of the active material layer away from the protruding portion, the second portion being positioned at a side of the first portion close to the protruding portion and connected with the first portion, and a thickness of the first portion being less than a thickness of the second portion, and a width of the first portion being less than a width of the second portion.

2. The electrode member according to claim 1 , wherein the thickness of the first portion is gradually decreased along a direction away from the protruding portion.

3. The electrode member according to claim 1 , wherein in a height direction, a ratio of a dimension of the first portion to a total dimension of the active material layer is from 3% to 20%.

4. The electrode member according to claim 1 , wherein a density of the second portion is greater than a density of the first portion.

5. The electrode member according to claim 1 , wherein a difference between the thickness of the first portion and the thickness of the second portion is 0.5 μm-20 μm.

6. The electrode member according to claim 1 , wherein
the active material layer further comprises a third portion, the third portion is positioned at a side of the second portion close to the protruding portion and connected with the second portion, and a thickness of the third portion is less than the thickness of the second portion;
the thickness of the third portion is gradually decreased along a direction close to the protruding portion.

7. The electrode member according to claim 6 , wherein the electrode member further comprises a protecting layer, the protecting layer is provided at a side of the protruding portion away from the insulating substrate and connected with the third portion.

8. The electrode member according to claim 7 , wherein a hardness of the protecting layer is greater than a hardness of the conducting layer.

9. The electrode member according to claim 7 , wherein the protecting layer comprises a binder and an insulating material, the insulating material includes at least one of aluminum oxide and aluminum oxyhydroxide.

10. The electrode member according to claim 7 , wherein the electrode member further comprises a conductive structure, the conductive structure is welded with a region of the protruding portion which is not covered by the protecting layer.

11. The electrode member according to claim 10 , wherein a gap is provided between the protecting layer and the conductive structure.

12. The electrode member according to claim 1 , wherein the electrode member further comprises a protecting layer, the protecting layer is provided at a side of the protruding portion away from the insulating substrate and connected with the active material layer.

13. The electrode member according to claim 12 , wherein the electrode member further comprises a conductive structure, the conductive structure is welded with a region of the protruding portion which is not covered by the protecting layer.

14. The electrode member according to claim 1 , wherein, when under a pressure, a difference between an extension ratio of the insulating substrate and an extension ratio of the conducting layer is not more than 4%.

15. The electrode member according to claim 14 , wherein the extension ratio of the insulating substrate under the pressure is less than 10%.

16. A secondary battery, comprising an electrode assembly, the electrode assembly comprising an electrode member;
the electrode member comprising an insulating substrate, a conducting layer and an active material layer;
the conducting layer being provided on a surface of the insulating substrate, and the conducting layer comprising a main portion and a protruding portion extending from the main portion, the main portion being coated with the active material layer, the protruding portion being not coated with the active material layer;
the active material layer comprising a first portion and a second portion, the first portion being positioned at an end of the active material layer away from the protruding portion, the second portion being positioned at a side of the first portion close to the protruding portion and connected with the first portion, and a thickness of the first portion being less than a thickness of the second portion, and a width of the first portion being less than a width of the second portion.

17. The secondary battery according to claim 16 , wherein
the active material layer further comprises a third portion, the third portion is positioned at a side of the second portion close to the protruding portion and connected with the second portion, and a thickness of the third portion is less than the thickness of the second portion;
the thickness of the third portion is gradually decreased along a direction close to the protruding portion.

18. The secondary battery according to claim 17 , wherein the electrode member further comprises a protecting layer, the protecting layer is provided at a side of the protruding portion away from the insulating substrate and connected with the third portion.

19. The secondary battery according to claim 18 , wherein the electrode member further comprises a conductive structure, the conductive structure is welded with a region of the protruding portion which is not covered by the protecting layer.

20. An apparatus, comprising a secondary battery according to claim 16 , wherein the secondary battery is adapted to provide power for the apparatus.

Assignees

• Contemporary Amperex Technology Co Ltd

Inventors

• Zhang Zige
• Li Wei
• Xue Qingrui
• Li Jing
• Wang Pengxiang
• Zhang Yang

Classifications

• H01M50/531

  Electrode connections inside a battery casing · CPC title

• H01M4/02 Primary

  Electrodes composed of, or comprising, active material · CPC title

• H01M50/536

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

• H01M4/0404

  by coating on electrode collectors · CPC title

• H01M4/66

  Selection of materials · CPC title