Electrode assembly, battery cell, battery, and manufacturing device and method for electrode assembly

Patent metadata

Field	Value
Publication number	US-12107232-B2
Application number	US-202117564537-A
Country	US
Kind code	B2
Filing date	Dec 29, 2021
Priority date	Feb 4, 2021
Publication date	Oct 1, 2024
Grant date	Oct 1, 2024

Abstract

An embodiment of the present application provide an electrode assembly, a battery cell, a battery, and an electrode assembly manufacturing equipment and method. Among that, the electrode assembly includes a negative electrode plate and a positive electrode plate which form a bending region. The positive electrode plate includes bending portions located in the bending region, the bending portion includes a positive electrode current collecting layer and a positive active substance layer, and at least one side surface of the positive electrode current collecting layer is provided with the positive active substance layer in a thickness direction of the positive electrode plate. At least one positive active substance layer is provided with the barrier layer, at least a part of the barrier layer is intercalated in the positive active substance layer provided with the barrier layer, and coats at least a part of particles in the positive active substance layer.

First claim

What is claimed is:

1. An electrode assembly, comprising a negative electrode plate and a positive electrode plate, the negative electrode plate and the positive electrode plate forming a bending region by winding or folding;
the positive electrode plate comprising a plurality of bending portions located in the bending region, the bending portion comprising a positive electrode current collecting layer and a positive active substance layer, and at least one side surface of the positive electrode current collecting layer being provided with the positive active substance layer in a thickness direction of the positive electrode plate;
wherein, at least one positive active substance layer is provided with a barrier layer, at least a part of the barrier layer is intercalated in the positive active substance layer provided with the barrier layer, and coats at least a part of particles in the positive active substance layer, to prevent the particles from releasing an ion to the negative electrode plate;
wherein the electrode assembly further comprises a separator for separating the positive electrode plate from the negative electrode plate; and the barrier layer is connected to the separator; and
wherein the separator is provided with a plurality of through holes; and
the barrier layer partially extends into the through hole and is connected to a hole wall of the through hole.

2. The electrode assembly according to claim 1 , wherein the positive electrode current collecting layer is provided with the positive active substance layer on an inner side surface in the thickness direction; and the positive active substance layer located on the inner side surface of at least one bending portion is provided with the barrier layer.

3. The electrode assembly according to claim 1 , wherein the positive electrode current collecting layer is provided with the positive active substance layer on an outer side surface in the thickness direction; and the positive active substance layer located on the outer side surface of at least one bending portion is provided with the barrier layer.

4. The electrode assembly according to claim 1 , wherein the positive electrode current collecting layer is provided with the positive active substance layer on both the inner side surface and the outer side surface in the thickness direction, and the positive active substance layer located on the inner side surface and the positive active substance layer located on the outer side surface of at least one bending portion are both provided with the barrier layer.

5. The electrode assembly according to claim 1 , wherein a depth of a part of the barrier layer extending into the through hole is no less than 3 micrometers.

6. The electrode assembly according to claim 1 , wherein both ends of the barrier layer extending along a bending direction of the bending portion are located in the bending region.

7. The electrode assembly according to claim 1 , wherein the electrode assembly comprises a straight region connected to the bending region;
both ends of the barrier layer extending along a bending direction of the bending portion are located in the straight region, or, one end of the barrier layer extending along the bending direction of the bending portion is located in the straight region, and the other end is located in the bending region.

8. The electrode assembly according to claim 1 , wherein the barrier layer is a glue layer.

9. A battery cell, comprising a shell and the electrode assembly according to claim 1 ;
the electrode assembly being accommodated in the shell.

10. A battery, comprising a box body, and the battery cell according to claim 9 ;
the battery cell being accommodated in the box body.

11. A power consumption device, comprising the battery cell according to claim 9 .

12. A manufacturing method for the electrode assembly of claim 1 , the manufacturing method comprising:
providing a positive electrode plate, a negative electrode plate, a separator and a barrier layer;
winding or folding the positive electrode plate and the negative electrode plate, to form a bending region;
wherein, the positive electrode plate comprises a plurality of bending portions located in the bending region, the bending portion comprises a positive electrode current collecting layer and a positive active substance layer, at least one side surface of the positive electrode current collecting layer is provided with the positive active substance layer on in a thickness direction of the positive electrode plate;
at least one positive active substance layer is provided with the barrier layer, at least a part of the barrier layer is intercalated in the positive active substance layer provided with the barrier layer, and coats at least a part of particles in the positive active substance layer, to prevent the particles from releasing an ion to the negative electrode plate; and
the separator is configured to separate the positive electrode plate from the negative electrode plate; and the barrier layer is connected to the separator.

13. The manufacturing method according to claim 12 , wherein the manufacturing method further comprises:
before winding or folding the positive electrode plate and the negative electrode plate, fixing the barrier layer on the positive electrode plate, so that at least a part of the barrier layer is intercalated in the positive active substance layer of the positive electrode plate.

14. The manufacturing method according to claim 12 , wherein a separator for separating the positive electrode plate from the negative electrode plate is provided, and the positive electrode plate, the separator and the negative electrode plate are wound or folded to form the bending region.

15. The manufacturing method according to claim 14 , wherein the manufacturing method further comprises:
heating the barrier layer, making the barrier layer in a viscous state, so that the barrier layer is bonded to the separator and infiltrated to a through hole of the separator.

16. An electrode assembly, comprising a negative electrode plate and a positive electrode plate, the negative electrode plate and the positive electrode plate forming a bending region by winding or folding;
the positive electrode plate comprising a plurality of bending portions located in the bending region, the bending portion comprising a positive electrode current collecting layer and a positive active substance layer, and at least one side surface of the positive electrode current collecting layer being provided with the positive active substance layer in a thickness direction of the positive electrode plate;
wherein, at least one positive active substance layer is provided with a barrier layer, at least a part of the barrier layer is intercalated in the positive active substance layer provided with the barrier layer, and coats at least a part of particles in the positive active substance layer, to prevent the particles from releasing an ion to the negative electrode plate;
wherein the electrode assembly further comprises a separator for separating the positive electrode plate from the negative electrode plate; and the barrier layer is connected to the separator; and
wherein the barrier layer comprises an intercalating portion and a connection portion;
the intercalating portion is intercalated in the positive active substance layer provided with the barrier layer, the connection portion is connected to the separator, and the connection portion is located between the separator and the positive active substance layer provided with the barrier layer.

17.

Assignees

• Contemporary Amperex Technology Hong Kong Ltd

Inventors

• Wu Kai
• Liu Huihui
• Li Zhonghong
• Wang Long
• Zheng tuo
• Che Huan

Classifications

• H01M50/209

  adapted for prismatic or rectangular cells (H01M50/216 takes precedence) · CPC title

• H01M4/38

  of elements or alloys · CPC title

• H01M10/0583

  of accumulators with folded construction elements except wound ones, i.e. folded positive or negative electrodes or separators, e.g. with "Z"-shaped electrodes or separators · CPC title

• H01M4/66

  Selection of materials · CPC title

• H01M2220/20

  Batteries in motive systems, e.g. vehicle, ship, plane · CPC title