Composite electrode plate and battery cell using the same

Patent metadata

Field	Value
Publication number	US-11380931-B2
Application number	US-201916528773-A
Country	US
Kind code	B2
Filing date	Aug 1, 2019
Priority date	Jun 21, 2019
Publication date	Jul 5, 2022
Grant date	Jul 5, 2022

Abstract

A composite electrode plate of increased robustness and with better electrical properties for incorporation in a battery cell includes a composite current collector, a positive active material layer, a negative active material layer, a first isolation layer, and a second isolation layer. The composite current collector is disposed between the positive active material layer and the negative active material layer. The first isolation layer connects to a surface of the positive active material layer away from the composite current collector. The second isolation layer connects to a surface of the negative active material layer away from the composite current collector.

First claim

What is claimed is:

1. A composite electrode plate comprising:
a composite current collector;
a positive active material layer;
a negative active material layer, the composite current collector is disposed between the positive active material layer and the negative active material layer;
a first isolation connected to a surface of the positive active material layer away from the composite current collector; and
a second isolation layer connected to a surface of the negative active material layer away from the composite current collector; wherein
the composite current collector comprises:
an insulating layer;
a first conductive layer; and
a second conductive layer, the insulating layer is disposed between the first conductive layer and the second conductive layer, and the first conductive layer is made of a material selected from a group consisting of Ni, Ti, Cu, Ag, Au, Pt, Fe, Co, Cr, W, Mo, Al, Mg, K, Na, Ca, Sr, Ba, Si, Ge, Sb, Pb, In, Zn, and any combination thereof; the second conductive layer is made of a material selected from a group consisting of Ni, Ti, Cu, Ag, Au, Pt, Fe, Co, Cr, W, Mo, Al, Mg, K, Na, Ca, Sr, Ba, Si, Ge, Sb, Pb, In, Zn, and any combination thereof.

2. The composite electrode plate of claim 1 , wherein each of the first isolation layer and the second isolation layer comprises a porous layer.

3. The composite electrode plate of claim 1 , wherein the positive active material layer is connected to a surface of the first conductive layer away from the insulating layer, and the negative active material layer is connected to a surface of the second conductive layer away from the insulating layer.

4. The composite electrode plate of claim 1 , wherein at least one of the first isolation layer and the second isolation layer comprises an isolation portion and an extension portion, and the isolation portion corresponds to the positive active material layer or the negative active material layer, and the extension portion extends from edges of the isolation portion, and surrounds edges of at least one of the positive active material layer and the negative active material layer.

5. The composite electrode plate of claim 4 , wherein the extension portion further surrounds edges of the composite current collector.

6. The composite electrode plate of claim 2 , wherein the porous layer is made of a material selected from a group consisting of polyvinylidene difluoride, polyvinylidene fluoride, polyimide, polyamide, polyacrylonitrile, polyethylene glycol, polyphenylene oxide, polyoxyethylene, polyethylene oxide, poly propylene carbonate, polymethyl methacrylate, polyethylene terephthalate, poly(vinylidene difluoride-co-hexafluoropropylene), poly(vinylidene fluoride-hexafluoropropylene), poly(vinylidene difluoride-co-chlorotrifluoroethylene), and derivatives thereof.

7. The composite electrode plate of claim 2 , wherein at least one of the first isolation layer and the second isolation layer further comprises a protection layer, and the protection layer fills in pores of the porous layer.

8. The composite electrode plate of claim 7 , wherein the protection layer comprises inorganic material selected from a group consisting of oxide, hydroxide, lithium compound, and any combination thereof.

9. The composite electrode plate of claim 2 , wherein at least one of the first isolation layer and the second isolation layer further comprises a protection layer, and the protection layer is disposed on a surface of the porous layer away from the positive active material layer or the negative active material layer.

10. The composite electrode plate of claim 9 , wherein a thickness of the porosity layer is 1 micrometer to 20 micrometers, and a thickness of the protection layer is 0.1 micrometer to 20 micrometers.

11. A battery cell comprising:
a composite electrode plate, the composite electrode plate wound or stacked to form the battery cell, the composite electrode plate comprising:
a composite current collector;
a positive active material layer;
a negative active material layer, the composite current collector is disposed between the positive active material layer and the negative active material layer;
a first isolation layer connected to a surface of the positive active material layer away from the composite current collector; and
a second isolation layer connected to a surface of the negative active material layer away from the composite current collector; wherein

the composite current collector comprises:
an insulating layer;
a first conductive layer; and
a second conductive layer, the insulating layer is disposed between the first conductive layer and the second conductive layer, and the first conductive layer is made of a material selected from a group consisting of Ni, Ti, Cu, Ag, Au, Pt, Fe, Co, Cr, W, Mo, Al, Mg, K, Na, Ca, Sr, Ba, Si, Ge, Sb, Pb, In, Zn, and any combination thereof; the second conductive layer is made of a material selected from a group consisting of Ni, Ti, Cu, Ag, Au, Pt, Fe, Co, Cr, W, Mo, Al, Mg, K, Na, Ca, Sr, Ba, Si, Ge, Sb, Pb, In, Zn, and any combination thereof.

12. The battery cell of claim 11 , wherein each of the first isolation layer and the second isolation layer comprises a porous layer.

13. The battery cell of claim 11 , wherein the positive active material layer is connected to a surface of the first conductive layer away from the insulating layer, and the negative active material layer is connected to a surface of the second conductive layer away from the insulating layer.

14. The battery cell of claim 11 , wherein at least one of the first isolation layer and the second isolation layer comprises an isolation portion and an extension portion, the isolation portion corresponds to the positive active material layer or the negative active material layer, the extension portion extends from edges of the isolation portion, and surrounds edges of at least one of the positive active material layer and the negative active material layer.

15. The battery cell of claim 14 , wherein the extension portion further surrounds edges of the composite current collector.

16. The battery cell of claim 12 , wherein the porous layer is made of a material selected from a group consisting of polyvinylidene difluoride, polyvinylidene fluoride, polyimide, polyamide, polyacrylonitrile, polyethylene glycol, polyphenylene oxide, polyoxyethylene, polyethylene oxide, poly propylene carbonate, polymethyl methacrylate, polyethylene terephthalate, poly(vinylidene difluoride-co-hexafluoropropylene), poly(vinylidene fluoride-hexafluoropropylene), poly(vinylidene difluoride-co-chlorotrifluoroethylene), and derivatives thereof.

17. The battery cell of claim 12 , wherein at least one of the first isolation layer and the second isolation layer further comprises a protection layer, and the protection layer fills in pores of the porous layer.

18. The battery cell of claim 17 , wherein the protection layer comprises inorganic material selected from a group consisting of oxide, hydroxide, lithium compound, and any combination thereof.

19. The battery cell of claim 12 , wherein at least one of the first isolation layer and the second isolation layer further comprises a protection layer, and the protection layer is disposed on a surface of the porous layer away from the positive active material layer or the negative active material layer.

20. The battery cell of claim 19 , wherein a thickness of the porosity layer is 1 micrometer to 20 micrometers, and a thickness of the protection layer is 0.1 micrometer to 2

Assignees

• Ningde Amperex Technology Ltd

Inventors

• Zhang yi-bo
• Xiang Li
• Wang Bin
• Hu Qiaoshu

Classifications

• H01M4/667 Primary

  in the form of layers, e.g. coatings · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M4/133

  Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M10/0436

  Small-sized flat cells or batteries for portable equipment · CPC title