CN219329292U

CN219329292U - Electrode assembly

Info

Publication number: CN219329292U
Application number: CN202320040279.0U
Authority: CN
Inventors: 汪勇; 丁华健; 安建; 胡本安; 于子龙; 陈杰
Original assignee: Huizhou Liwinon Energy Technology Co Ltd
Current assignee: Huizhou Liwinon Energy Technology Co Ltd
Priority date: 2023-01-04
Filing date: 2023-01-04
Publication date: 2023-07-11
Anticipated expiration: 2033-01-04

Abstract

The utility model provides an electrode assembly, which comprises a first pole piece, a second pole piece, a diaphragm and a fastening part. The second pole piece and the first pole piece are different in polarity, the diaphragm is positioned between the first pole piece and the second pole piece, and the first pole piece, the diaphragm and the second pole piece are wound and overlapped. A fastening part is located at one side of the electrode assembly parallel to the winding shaft, wherein the fastening part provides a force in a thickness direction of the electrode assembly to fasten the first electrode sheet, the separator, and the second electrode sheet. The electrode assembly can improve the problem of lithium separation and can improve the problems of dislocation of the first pole piece and the second pole piece and membrane folding in the falling process of the battery core of the lithium battery due to the existence of the fastening part, and the first pole piece, the second pole piece and the membrane are overlapped and are tighter and firmer at one side parallel to the winding shaft.

Description

Electrode assembly

Technical Field

The utility model relates to the technical field of lithium batteries, in particular to a lithium battery.

Background

When a lithium ion battery is charged, li+ is extracted from the positive electrode and inserted into the negative electrode. However, in some abnormal situations, such as insufficient lithium intercalation space of the anode, too large resistance of the li+ intercalation anode, too fast deintercalation of the li+ from the anode but not equivalent intercalation of the anode, the li+ which cannot be intercalated into the anode can only obtain electrons on the surface of the anode, thereby forming silvery white metallic lithium simple substance, namely lithium precipitation. The lithium precipitation not only reduces the battery performance and shortens the cycle life greatly, but also limits the quick charge capacity of the battery, and can cause disastrous consequences such as combustion, explosion and the like.

At present, the 3C product has higher and higher requirement on the charging multiplying power, and the soft package battery is found to be easy to separate out lithium from the head to the tail in the width direction of the pole piece after circulation. The disassembly finds that the head and tail pole pieces of the lithium battery have weak bonding capability, so that the distance between the head and tail pole pieces of the lithium battery is larger or the distance between the head and tail pole pieces of the lithium battery is misplaced, and lithium ions cannot be inserted into the corresponding positions of the negative pole pieces, thereby generating a lithium precipitation phenomenon.

Disclosure of Invention

The main object of the present utility model is to propose an electrode assembly capable of improving the problem of lithium precipitation associated with the electrode assembly.

In order to achieve the above object, the present utility model provides an electrode assembly including a first electrode sheet, a second electrode sheet, a separator, and a fastening portion. The second pole piece and the first pole piece are different in polarity, the diaphragm is positioned between the first pole piece and the second pole piece, and the first pole piece, the diaphragm and the second pole piece are wound and overlapped. A fastening part is located at one side of the electrode assembly parallel to the winding shaft, wherein the fastening part provides a force in a thickness direction of the electrode assembly to fasten the first electrode sheet, the separator, and the second electrode sheet.

In some embodiments, both sides of the electrode assembly parallel to the winding shaft have the fastening part.

In some embodiments, the fastening portion is a glue solution disposed on a surface of the first pole piece, the glue solution being attached to a side of the first pole piece parallel to the winding axis, the glue solution being used to fasten the diaphragm and the first pole piece.

In some embodiments, the fastening portion is a glue solution disposed on a surface of the second pole piece, the glue solution being attached to a side of the second pole piece parallel to the winding axis, the glue solution being used to fasten the diaphragm and the second pole piece.

In some embodiments, the fastening portion is a glue disposed on a surface of the diaphragm facing the first pole piece, the glue conforming to a side of the diaphragm parallel to the winding axis, the glue being used to fasten the diaphragm and the first pole piece.

And/or the fastening part is glue solution arranged on the surface of the diaphragm facing the second pole piece, the glue solution is attached to one side of the diaphragm parallel to the winding shaft, and the glue solution is used for fastening the diaphragm and the second pole piece.

The glue solution thickness of the two sides of the electrode assembly parallel to the winding shaft is equal.

In some embodiments, the glue solution of the electrode assembly is arranged continuously.

In some embodiments, the paste is 0.3mm to 1.5mm from the edge of the electrode assembly in a direction parallel to the winding axis.

In some embodiments, the gum solution is made by mixing PFVD and NMP in a ratio of 1:15 to 1:30.

The utility model also provides an electrode assembly formed by lamination, which comprises a first pole piece, a second pole piece, a diaphragm and a fastening part. The second pole piece and the first pole piece are different in polarity, the diaphragm is positioned between the first pole piece and the second pole piece, and the first pole piece, the diaphragm and the second pole piece are overlapped. The fastening part is positioned at the side of the electrode assembly parallel to the plane of the first electrode plate, wherein the fastening part provides a force along the thickness direction of the electrode assembly so as to fasten the first electrode plate, the diaphragm and the second electrode plate.

Compared with the prior art, the utility model has the beneficial effects that:

the first pole piece, the second pole piece and the diaphragm are wound and overlapped together, and the electrode assembly of the utility model is provided with the fastening part which is arranged on one side of the electrode assembly parallel to the winding shaft and provides force along the thickness direction of the electrode assembly, so that the first pole piece, the second pole piece and the diaphragm are overlapped more tightly and more firmly on one side of the electrode assembly parallel to the winding shaft due to the existence of the fastening part. Therefore, the first pole piece, the diaphragm and the second pole piece are difficult to misplace and separate after being overlapped, so that the electrode assembly can improve the problem of lithium separation, and can improve the problems of misplacement of the first pole piece and the second pole piece and diaphragm folding in the falling process of the battery core of the lithium battery.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of an electrode assembly according to the present utility model;

FIG. 2 is a schematic view of a structure in which a fastening portion is a glue solution adhered to a surface of a first pole piece according to an embodiment of the present utility model;

FIG. 3 is a schematic view showing a structure of a fastening portion adhered to a surface of a second pole piece according to an embodiment of the present utility model;

fig. 4 is a schematic structural view of a glue solution adhered to a surface of a diaphragm at a fastening portion according to an embodiment of the present utility model.

Reference numerals illustrate:

a first pole piece 100;

a second pole piece 200;

a diaphragm 300;

a fastening part 400; glue 410.

The achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that, if a directional indication (such as up, down, left, right, front, and rear … …) is included in the embodiment of the present utility model, the directional indication is merely used to explain a relative positional relationship, a movement condition, and the like between the components in a specific posture, and if the specific posture is changed, the directional indication is correspondingly changed.

In addition, if there is a description of "first", "second", etc. in the embodiments of the present utility model, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, if "and/or", "and/or" and/or "are used throughout, the meaning includes three parallel schemes, for example," a and/or B ", including a scheme, or B scheme, or a scheme where a and B meet simultaneously. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.

In the prior art, the head and tail pole pieces of the lithium battery have weak bonding capability, so that the distance between the head and tail pole pieces of the lithium battery is larger or the distance between the head and tail pole pieces of the lithium battery is misplaced, and lithium ions cannot be inserted into the corresponding positions of the negative pole pieces, thereby generating a lithium precipitation phenomenon.

In view of this, referring to fig. 1 to 4, there is provided an electrode assembly including a first electrode sheet 100, a second electrode sheet 200, a separator 300, and a fastening part 400, wherein polarities of the second electrode sheet 200 and the first electrode sheet 100 are different. It is understood that the first pole piece 100 may be a positive pole piece or a negative pole piece. When the first electrode sheet 100 is a positive electrode sheet, the second electrode sheet 200 is a negative electrode sheet, and when the first electrode sheet 100 is a negative electrode sheet, the second electrode sheet 200 is a positive electrode sheet.

Referring to fig. 1, in detail, the first pole piece 100, the second pole piece 200, and the diaphragm 300 are wound together to form a cylinder shape, wherein the diaphragm 300 is positioned between the first pole piece 100 and the second pole piece 200, the first pole piece 100 and the diaphragm 300 are overlapped with each other, and the second pole piece 200 and the diaphragm 300 are overlapped with each other. It should be noted that, when the first electrode sheet 100 and the separator 300 are stacked with each other, the first electrode sheet 100 and the separator 300 are pressed together toward the electrode assembly winding axis due to the force perpendicular to the electrode assembly winding axis, and the second electrode sheet 200 and the separator 300 are stacked with each other, the second electrode sheet 200 and the separator 300 are pressed together toward the electrode assembly winding axis due to the force perpendicular to the electrode assembly winding axis. The first electrode sheet 100, the separator 300, and the second electrode sheet 200 can be stably stacked, thereby stabilizing the electrode assembly structure and facilitating the application of the electrode assembly.

Referring to fig. 1, one side of the electrode assembly parallel to the winding shaft is provided with a fastening part 400. It is understood that the winding shaft passes through the electrode assembly, the fastening part 400 is disposed around the winding shaft, and the fastening part 400 is disposed at a position where the electrode assembly is worn near the wound shaft. The fastening part 400 provides a force in the thickness direction of the electrode assembly to fasten the first electrode sheet 100, the separator 300, and the second electrode sheet 200.

Specifically, in the thickness direction of the electrode assembly, the fastening part 400 is located inside the electrode assembly, and provides a tensile force to compact the first and

second electrode sheets

100, 200 and the separator 300 toward the winding axis, or the fastening part 400 is located outside the electrode assembly, and provides a compressive force to compact the first and

second electrode sheets

100, 200 and the separator 300 toward the winding axis. The thickness direction of the electrode assembly is perpendicular to a line where the winding axis of the electrode assembly is located, the force provided by the fastening part 400 is along the thickness direction of the electrode assembly and the force provided by the fastening part 400 is from the outside Zhou Zhixiang of the electrode assembly to the winding axis of the electrode assembly, thereby making the first and

second electrode sheets

100 and 200 and the separator 300 more fastened in combination.

Specifically, when the fastening part 400 is located inside the electrode assembly, the fastening part 400 may be a glue solution 410 adhered to the surface of the separator 300, the first pole piece 100 or the second pole piece 200, and the separator 300, the first pole piece 100 and the second pole piece 200 are fastened by adhering the separator 300 to the first pole piece 100 or the second pole piece 200. When the fastening part 400 is positioned at the outside of the electrode assembly, the fastening part 400 may be a collar which is not deformed to cover the electrode assembly, the fastening part 400 is sleeved at the outside of the electrode assembly, and applies a force toward the winding axis of the electrode assembly to the members of the electrode assembly, so that the first electrode sheet 100, the separator 300, and the second electrode sheet 200 are fastened.

The fastening of the first pole piece 100, the diaphragm 300, and the second pole piece 200 means that the first pole piece 100, the second pole piece 200, and the diaphragm 300 can be compactly and firmly combined together, and separation and dislocation are difficult to occur.

The fastening part 400 provides a force in the thickness direction of the electrode assembly, so the first and

second electrode sheets

100 and 200 and the separator 300 may be overlapped more tightly and more firmly on one side parallel to the winding axis due to the fastening part 400. Therefore, the first pole piece 100, the diaphragm 300 and the second pole piece 200 are difficult to misplace and separate after being overlapped, so the electrode assembly of the utility model can improve the problem of lithium separation, and can improve the problems of misplacement of the first pole piece 100 and the second pole piece 200 and turnover of the diaphragm 300 in the falling process of the battery core of the lithium battery.

In some real-time examples, referring to fig. 1, in particular, both sides of the electrode assembly parallel to the winding shaft have fastening parts 400. For example, when the fastening part 400 is positioned at the glue 410 inside the electrode assembly, both sides of the electrode assembly parallel to the winding axis have the glue 410, and the glue 410 is adhered to the separator 300 to improve the fastening force of the separator 300 and the first or

second electrode sheet

100 or 200. When the fastening part 400 is provided outside the electrode assembly, both sides of the electrode assembly parallel to the winding shaft have collars, which tighten both sides of the electrode assembly parallel to the winding shaft, so that the first and

second electrode sheets

100 and 200 and the separator 300 are fastened at positions where the electrode assembly is parallel to both sides of the winding shaft.

The fastening parts 400 are arranged on two sides of the electrode assembly, which are parallel to the winding shaft, so that the fastening effect of the first pole piece 100, the second pole piece 200 and the diaphragm 300 at the positions of the electrode assembly, which are parallel to the two sides of the winding shaft, can be improved, the tight fit between the first pole piece 100, the second pole piece 200 and the diaphragm 300 at the two ends of the electrode assembly is ensured, the problem of head-tail lithium precipitation of a lithium battery adopting the electrode assembly can be better improved, and the problems of dislocation of the pole pieces and folding of the diaphragm 300 in the process of dropping a battery cell of the lithium battery adopting the electrode assembly can be better improved.

In some embodiments, referring to fig. 2, the fastening portion 400 is a glue 410 disposed on a surface of the first pole piece 100, the glue 410 is attached to a side of the first pole piece 100 parallel to the winding axis, and the glue 410 is used to fasten the diaphragm 300 and the first pole piece 100. Specifically, the glue solution 410 may be disposed along the direction of the line of the winding axis of the electrode assembly, and adhered to any one of the two sides of the first electrode sheet 100. The surfaces of both sides of the first electrode sheet 100 may be bonded with the glue 410 along the direction of the straight line of the winding axis of the electrode assembly.

Glue 410 adheres to the surface of first pole piece 100 facing diaphragm 300 to make the bond between diaphragm 300 and first pole piece 100 more secure.

In some embodiments, referring to fig. 3, the fastening portion 400 is a glue 410 disposed on a surface of the second pole piece 200, the glue 410 being attached to a side of the second pole piece 200 parallel to the winding axis, the glue 410 being used to fasten the diaphragm 300 and the second pole piece 200. Specifically, the glue solution 410 may be disposed to be adhered to the second electrode sheet 200 at any one side position along the direction of the straight line of the winding axis of the electrode assembly. The surfaces of both sides of the second electrode sheet 200 may be bonded with the glue solution 410 along the direction of the straight line of the winding axis of the electrode assembly.

Glue 410 adheres to the surface of second pole piece 200 facing diaphragm 300 to make the bond between diaphragm 300 and second pole piece 200 more secure.

In some embodiments, referring to fig. 4, the fastening portion 400 is a glue 410 disposed on a surface of the diaphragm 300, where the glue 410 is attached to a side of the diaphragm 300 parallel to the winding axis, and the glue 410 is used to fasten the diaphragm 300 to the first pole piece 100 or the glue 410 is used to fasten the diaphragm 300 to the second pole piece 200. Specifically, the paste 410 may be disposed in a direction along the line of the winding axis of the electrode assembly to be adhered to either side of the separator 300. The surfaces of both sides of the separator 300 may be bonded with the paste 410 along the direction in which the winding axis of the electrode assembly is straight.

Glue 410 adheres to the surface of diaphragm 300 facing first pole piece 100 to make the bond between diaphragm 300 and first pole piece 100 more secure. Glue 410 adheres to the surface of diaphragm 300 facing second pole piece 200 to make the bond between diaphragm 300 and second pole piece 200 more secure.

The first pole piece 100, the second pole piece 200 and the diaphragm 300 are combined more tightly and more firmly on the side parallel to the winding axis. Therefore, the first pole piece 100, the diaphragm 300 and the second pole piece 200 are difficult to misplace and separate after being overlapped, so the electrode assembly of the utility model can improve the problem of lithium separation, and can improve the problems of misplacement of the first pole piece 100 and the second pole piece 200 and turnover of the diaphragm 300 in the falling process of the battery core of the lithium battery.

In some embodiments, glue 410 may be disposed during a slitting process associated with the production of an electrode assembly. Specifically, a glue spraying device is arranged in the slitting process, and the glue spraying device sprays glue to the first pole piece 100, the second pole piece 200 or the diaphragm 300 in the width direction of the first pole piece 100, the second pole piece 200 or the diaphragm 300. And then, the procedure related to the electrode assembly is the same as the conventional method, and the glue is activated during formation, so that the combination among the first pole piece 100, the second pole piece 200 and the diaphragm 300 is more compact and stable, and the effect of improving lithium precipitation is achieved.

In some embodiments, glue 410 may be disposed during a winding process associated with the production of an electrode assembly. Specifically, the glue spraying device is arranged in the winding procedure, the first pole piece 100, the second pole piece 200 and the diaphragm 300 are wound along the length direction, the glue spraying device sprays glue to the width directions of the first pole piece 100, the second pole piece 200 and the diaphragm 300, the first pole piece, the second pole piece 200 and the diaphragm 300 are rewound into the battery cell after glue spraying, and then the battery cell is activated when formed, so that the combination among the first pole piece 100, the second pole piece 200 and the diaphragm 300 is tighter and firmer, and the effect of improving lithium precipitation is achieved.

In some embodiments, more glue 410 may be sprayed on two sides of the width direction of the diaphragm 300 when the diaphragm 300 is used for material feeding, so that the combination between the first pole piece 100, the second pole piece 200 and the diaphragm 300 is tighter and firmer, and the effect of improving lithium precipitation is achieved.

It is understood that in some embodiments, both sides of the electrode assembly parallel to the winding shaft have fastening parts 400. The glue 410 of both sides of the electrode assembly parallel to the winding axis has the same thickness. The glue solution 410 is arranged to form the glue layer with equal thickness, so that the electrode assemblies can be uniformly arranged on two sides parallel to the winding shaft, and the fastening degree between the first pole piece 100, the second pole piece 200 and the diaphragm 300 can be conveniently improved.

Referring to fig. 1-4, it can be appreciated that in some embodiments, the glue 410 of the electrode assembly is arranged continuously, and in other embodiments, the glue 410 of the electrode assembly is arranged intermittently, so that the glue 410 only provides a fastening force to facilitate a precise and firm connection between the first pole piece 100, the second pole piece 200, and the separator 300.

Referring to fig. 1 to 4, the glue 410 is 0.3mm to 1.5mm from the edge of the electrode assembly in a direction parallel to the winding axis, which is the distance from the glue 410 to the edge of the first pole piece 100 in a direction parallel to the winding axis when the glue 410 is disposed on the first pole piece 100; when the glue 410 is disposed on the second pole piece 200, the distance is the distance from the glue 410 to the edge of the second pole piece 200 along the direction parallel to the winding axis; when glue 410 is disposed on diaphragm 300, this distance is the distance between glue 410 and the edge of diaphragm 300 in a direction parallel to the winding axis. For example, the paste 410 is 0.3mm, 0.7mm, 1mm, 1.2mm, or 1.5mm from the electrode assembly in a direction parallel to the winding axis. The glue 410 is disposed at a distance from the edge of the electrode assembly in a direction parallel to the winding axis, preventing the glue 410 from precipitating to affect the ability of the electrode assembly.

It will be understood, of course, that the glue 410 is spaced from the edge of the electrode assembly in a direction perpendicular to the winding axis to prevent the glue 410 from separating out and affecting the ability of the battery.

In some embodiments, the glue 410 is made by mixing PFVD and NMP in a ratio of 1:15 to 1:30, and the glue 410 thus made has better adhesion and facilitates operation of the electrode assembly.

The present utility model also provides an electrode assembly formed of a laminate sheet, including the first electrode sheet 100, the second electrode sheet 200, the separator 300, and the fastening part 400. The second pole piece 200 has a polarity different from that of the first pole piece 100, the diaphragm 300 is positioned between the first pole piece 100 and the second pole piece 200, and the first pole piece 100, the diaphragm 300 and the second pole piece 200 are overlapped.

The fastening part 400 is located at an edge side of the electrode assembly parallel to the plane of the first electrode sheet 100, wherein the fastening part 400 provides a force in the thickness direction of the electrode assembly to fasten the first electrode sheet 100, the separator 300, and the second electrode sheet 200.

It should be noted that, the fastening portion 400 may be disposed on any side of the plane where the electrode assembly is parallel to the first electrode sheet 100, and the fastening portion 400 may be disposed near a contour line of the plane where the electrode assembly is parallel to the first electrode sheet 100, which is only required to satisfy that the fastening portion 400 provides a force along the thickness direction of the electrode assembly, so as to fasten the first electrode sheet 100, the separator 300 and the second electrode sheet 200.

In some embodiments, the fastening portion 400 is a glue 410 disposed on a surface of the first pole piece 100, where the glue 410 is attached to an edge side of the first pole piece 100 parallel to a plane of the first pole piece 100, and the glue 410 is used to fasten the diaphragm 300 and the first pole piece 100. Glue 410 adheres to the surface of first pole piece 100 facing diaphragm 300 to make the bond between diaphragm 300 and first pole piece 100 more secure.

In some embodiments, the fastening portion 400 is a glue solution 410 disposed on the surface of the second pole piece 200, where the glue solution 410 is attached to an edge side of the second pole piece 200 parallel to the plane of the first pole piece 100, and the glue solution 410 is used to fasten the diaphragm 300 and the second pole piece 200. Glue 410 adheres to the surface of second pole piece 200 facing diaphragm 300 to make the bond between diaphragm 300 and first pole piece 100 more secure.

In some embodiments, the fastening portion 400 is a glue 410 disposed on the surface of the diaphragm 300, where the glue 410 is attached to an edge of the diaphragm 300 parallel to the plane of the first pole piece 100, and the glue 410 is used for fastening the diaphragm 300 and the first pole piece 100 or the glue 410 is used for fastening the diaphragm 300 and the second pole piece 200.

The first pole piece 100, the second pole piece 200, and the diaphragm 300 are combined more tightly and more firmly. Therefore, the first pole piece 100, the diaphragm 300 and the second pole piece 200 are difficult to misplace and separate after being overlapped, so that the lithium battery adopting the lamination forming electrode assembly can improve the problem of lithium precipitation, and can improve the problems of misplacement of the first pole piece 100 and the second pole piece 200 and turnover of the diaphragm 300 in the falling process of the battery core of the lithium battery.

The foregoing description of the preferred embodiments of the present utility model should not be construed as limiting the scope of the utility model, but rather should be understood to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the utility model as defined by the following description and drawings or any application directly or indirectly to other relevant art(s).

Claims

1. An electrode assembly, comprising:

a first pole piece;

a second pole piece having a polarity different from the first pole piece;

the diaphragm is positioned between the first pole piece and the second pole piece, and the first pole piece, the diaphragm and the second pole piece are wound and overlapped;

and a fastening part at one side of the electrode assembly parallel to the winding shaft, wherein the fastening part provides a force in a thickness direction of the electrode assembly to fasten the first electrode sheet, the separator, and the second electrode sheet.

2. The electrode assembly of claim 1, wherein the electrode assembly comprises,

the electrode assembly has the fastening part at both sides parallel to the winding shaft.

3. The electrode assembly of claim 1, wherein the electrode assembly comprises,

the fastening part is glue solution arranged on the surface of the first pole piece, the glue solution is attached to one side of the first pole piece parallel to the winding shaft, and the glue solution is used for fastening the diaphragm and the first pole piece.

4. The electrode assembly of claim 1, wherein the electrode assembly comprises,

the fastening part is glue solution arranged on the surface of the second pole piece, the glue solution is attached to one side of the second pole piece parallel to the winding shaft, and the glue solution is used for fastening the diaphragm and the second pole piece.

5. The electrode assembly of claim 1, wherein the electrode assembly comprises,

the fastening part is glue solution arranged on the surface of the diaphragm facing the first pole piece, the glue solution is attached to one side of the diaphragm parallel to the winding shaft, and the glue solution is used for fastening the diaphragm and the first pole piece;

6. The electrode assembly according to any one of claim 3 to 5, wherein,

the electrode assembly has the fastening part at both sides parallel to the winding shaft;

7. The electrode assembly according to any one of claim 3 to 5, wherein,

the glue solution of the electrode assembly is continuously arranged.

8. The electrode assembly according to any one of claim 3 to 5, wherein,

the paste is 0.3mm to 1.5mm from the edge of the electrode assembly in a direction parallel to the winding axis.

9. The electrode assembly according to any one of claim 3 to 5, wherein,

the glue solution is prepared by mixing PFVD and NMP according to the proportion of 1:15 to 1:30.

10. A laminated electrode assembly comprising:

a first pole piece;

a second pole piece having a polarity different from the first pole piece;

the diaphragm is positioned between the first pole piece and the second pole piece, and the first pole piece, the diaphragm and the second pole piece are overlapped;

and a fastening part positioned at an edge side of the electrode assembly parallel to the plane of the first electrode sheet, wherein the fastening part provides a force in the thickness direction of the electrode assembly so as to fasten the first electrode sheet, the separator and the second electrode sheet.