CN218867148U

CN218867148U - Pole piece and battery

Info

Publication number: CN218867148U
Application number: CN202223416904.1U
Authority: CN
Inventors: 魏建良
Original assignee: Jiangsu Zenio New Energy Battery Technologies Co Ltd
Current assignee: Jiangsu Zenio New Energy Battery Technologies Co Ltd
Priority date: 2022-12-20
Filing date: 2022-12-20
Publication date: 2023-04-14
Anticipated expiration: 2032-12-20

Abstract

The utility model relates to the technical field of energy storage devices, and discloses a pole piece and a battery, which comprises a current collector, an adhesive coating and an active substance layer; the current collector is provided with a cutting area, and the adhesive coating is coated on the cutting area; the active substance layer is coated on the current collector and the adhesive coating; the adhesive coating is disposed between the current collector and the active material layer to increase adhesion of the current collector and the active material layer. The utility model discloses a pole piece and battery, pole piece are less cutting the dust that the in-process produced, are favorable to promoting the production yield and the security performance of electric core.

Description

Pole piece and battery

Technical Field

The utility model relates to an energy storage device technical field especially relates to a pole piece and battery.

Background

At present, the bonding force between the active material and the current collector is general, so that in the process of cutting off the pole piece, the opening and closing of the cutter can cause certain active material dust to fall off, and if excessive dust falls off into the battery cell, a high potential test (high yield test) of the winding core is possibly caused to be bad, so that the yield and the safety performance of the battery cell are influenced.

In view of this, it is desirable to design a pole piece and a battery to reduce dust generated during the cutting process of the pole piece, so as to improve the production yield and safety performance of the battery cell.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a pole piece and battery to reduce the pole piece and cut the dust that the in-process produced.

To achieve the purpose, the utility model adopts the following technical proposal:

a pole piece, comprising:

the current collector is provided with a cutting area, and an adhesive coating is coated on the cutting area;

the active substance layer is coated on the current collector and the adhesive coating;

the adhesive coating is disposed between the current collector and the active material layer to increase adhesion of the current collector and the active material layer.

In a specific implementation, the width a of the adhesion coating is not less than the width B of the active material layer.

In a particular implementation, the thickness of the adhesion coating is 0.5-2 μm.

In a particular implementation, the adhesive coating is rectangular or parallelogram-shaped.

In a specific implementation manner, a coating area and coating empty foil areas positioned on two opposite sides of the coating area are arranged on the current collector;

the cutting area is arranged in the coating area, and the width of the cutting area is equal to that of the coating area.

In a specific implementation mode, the current collector is a positive electrode current collector, and the active material layer is a positive electrode active material layer; alternatively, the first and second electrodes may be,

the mass flow body is the negative pole mass flow body, active substance layer is negative pole active substance layer.

In a particular implementation, the adhesive coating includes a binder and a conductive agent.

In a specific implementation manner, cutting areas are arranged on two opposite side surfaces of the current collector, and the cutting areas on the two sides are arranged oppositely;

both sides the cutting district all is provided with the adhesion coating, just the adhesion coating is kept away from scribble on the side of mass flow body and be equipped with the active material layer.

In a particular implementation, the active substance layer completely covers the adhesive coating.

In a particular implementation, the length L of the adhesive coating ranges from 6mm to 10mm.

A battery comprising a pole piece as claimed in any one of the above.

Compared with the prior art, the utility model discloses following beneficial effect has:

in this implementation, through being provided with the adhesion coating in order to increase the adhesion of mass flow body and active substance layer, the dust that produces because of the vibration of mass flow body in the die-cut in-process of messenger's cutter still less is favorable to promoting the production yield and the security performance of electric core.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without inventive exercise.

The structure, proportion, size and so on shown in the drawings of the present specification are only used to cooperate with the content disclosed in the specification for the understanding and reading of the people skilled in the art, and are not used to limit the limit conditions of the present invention, so that the present invention does not have the essential significance in the technology, and the modification of any structure, the change of the proportion relation or the adjustment of the size should still fall within the scope that the technical content disclosed in the present invention can cover without affecting the function and the achievable purpose of the present invention.

Fig. 1 is a schematic top view of a pole piece provided in an embodiment of the present invention;

FIG. 2 isbase:Sub>A schematic view of the cross-sectional structure A-A of the electrode plate shown in FIG. 1;

FIG. 3 is a schematic cross-sectional view B-B of the electrode plate shown in FIG. 1;

FIG. 4 is a schematic view of the C-C cross section structure of the present invention;

fig. 5 is a schematic structural diagram of a current collector coated with an adhesion coating according to an embodiment of the present invention.

Illustration of the drawings: 1. a current collector; 2. an adhesive coating; 3. an active material layer.

Detailed Description

In order to make the objects, features and advantages of the present invention more obvious and understandable, the drawings in the embodiments of the present invention are combined below to clearly and completely describe the technical solutions in the embodiments of the present invention, and obviously, the embodiments described below are only some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention. It should be noted that when one component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present.

The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.

Example one

The embodiment of the utility model provides a pole piece can effectively reduce the pole piece and cut the dust that the in-process produced to be favorable to promoting the production yield of electric core, ensure the security performance of electric core.

Referring to fig. 1 to 5, the electrode sheet includes a current collector 1, an adhesive coating 2, and an active material layer 3. Wherein, a cutting area is arranged on the current collector 1, and an adhesive coating 2 is coated on the cutting area; and the active material layer 3 is coated on the current collector 1 and the adhesive coating 2.

The adhesion coating 2 is disposed between the current collector 1 and the active material layer 3, and the adhesion coating 2 can effectively increase the adhesion between the current collector 1 and the active material layer 3. During cutting, the cutting knife cuts along the region provided with the adhesive coating 2, thereby dividing the pole piece into two parts from the region provided with the adhesive coating 2. The adhesion effect of adhesion coating 2 can effectively reduce the dust that forms because of the cutter is die-cut, avoids active material layer 3 to drop too much dust to be favorable to promoting the production yield and the security performance of electric core.

In a specific embodiment, as shown in fig. 1 and 5, the width a of the adhesive coating 2 is not less than the width B of the active material layer 3, avoiding direct contact between the active material layer 3 and the current collector 1. The active material layer 3 is directly coated on the current collector 1, the adhesion between the active material layer 3 and the current collector 1 is poor, and when the current collector is punched by a cutter, part of the material on the active material layer 3 can fall off due to vibration generated by the current collector 1 to form dust. The vibration has been alleviated to active material layer 3's existence on the one hand, and on the other hand has promoted the adhesion effect to active material layer 3 to can effectively reduce the production of dust, and then be favorable to promoting the production yield of electric core.

Alternatively, the thickness of the adhesion coating 2 is 0.5-2 μm. The adhesive coating 2 is thin, and the active substance layer 3 is coated on the adhesive coating 2 without obvious protrusion, and the winding, coating or rolling of the pole piece is not influenced.

Alternatively, the adhesive coating 2 is rectangular or parallelogram shaped. Typically, the knife is die cut along the middle of the adhesive coating 2 to cut the pole piece. At the moment, the end parts of the cut pole pieces are provided with the adhesive coatings, so that the generation amount of dust can be effectively reduced, and excessive dust is not easy to remain on the pole pieces.

Optionally, the current collector 1 is provided with a coating area and coating empty foil areas located at two opposite sides of the coating area; the coating empty foil area is a tab forming area. The cutting area is arranged in the coating area, and the width of the cutting area is equal to that of the coating area. It should be noted that the width of the cutting area is equal to the width of the coating area, that is, the current collector 1 and the active material layer 3 are separated from each other in the cutting area, so as to avoid the generation of dust during the cutting process to the maximum extent.

Alternatively, the current collector 1 is a positive electrode current collector, and the active material layer 3 is a positive electrode active material layer 3; alternatively, the current collector 1 is a negative electrode current collector, and the active material layer 3 is a negative electrode active material layer 3. The structure in this embodiment is suitable for the production of both the positive plate and the negative plate.

Optionally, the adhesive coating 2 includes a binder and a conductive agent therein. The adhesive is used for increasing the adhesion between the current collector 1 and the active material layer 2, and the conductive agent is a pole piece which keeps good conductive performance so as to avoid influencing the conductive performance of a finished product battery core.

In another specific embodiment, the opposite two side surfaces of the current collector 1 are both provided with cutting areas, and the cutting areas on the two side surfaces are opposite to each other; the cutting district of both sides all is provided with adhesive coating 2, and the both sides of the mass flow body 1 all scribble and be equipped with active substance layer 3, scribbles active substance layer 3 in addition on the side that adhesive coating 2 kept away from the mass flow body 1, active substance layer 3 covers on adhesive coating 2 promptly. It should be noted that the cutting area is an area enclosed by a dotted line in fig. 5, the active material layer 2 is disposed in the cutting area, the cutting area is correspondingly disposed on both opposite side surfaces of the current collector 1, and the opposite side surfaces of the current collector 1 refer to the top surface and the bottom surface of the current collector 1. More specifically, the cutout is an area surrounded by a dotted line in fig. 5 projected onto the current collector 1 in a direction perpendicular to the side surface of the current collector 1.

The cutting areas on the two side surfaces are oppositely arranged, so that the cutter can penetrate through the two layers of adhesive coatings in the cutting process, and dust in the punching process can be well reduced.

Alternatively, the active substance layer 3 completely covers the adhesive coating 2. Note that the width a of the adhesive coat layer 2 does not necessarily need to be larger than the width B of the active material layer 3. As long as the adhesive coating 2 is present, dust during punching can be reduced. Therefore, when the active material layer 3 completely covers the adhesive coating layer 2, the adhesive coating layer 2 may be in a net shape, and may include several divided layers or the like.

It should be added that the adhesive coating 2 is applied by a batch coating process.

Alternatively, as shown in fig. 5, the length L of the adhesive coating 2 ranges from 6mm to 10mm. The value range of L is 6mm-10m, so that on one hand, the adsorption effect of the adhesive coating 2 is ensured, and on the other hand, the cutter is convenient to adjust, so that the cutter can accurately cut from the adhesive coating 2.

The pole piece of this embodiment can effectively reduce the produced dust of the die-cut in-process of pole piece, is favorable to promoting the production quality of electric core, promotes the security of electric core.

Example two

The embodiment discloses a battery, which comprises the pole piece in the first embodiment.

The battery comprises a positive plate, a diaphragm and a negative plate, wherein at least one of the positive plate and the negative plate belongs to the first embodiment of the pole piece, and the diaphragm is arranged between the positive plate and the negative plate. The battery can be a rolled core battery or a laminated battery.

The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims

1. A pole piece, comprising:

the current collector (1) is provided with a cutting area, and an adhesive coating (2) is coated on the cutting area;

the active substance layer (3) is coated on the current collector (1) and the adhesive coating (2);

the adhesive coating (2) is disposed between the current collector (1) and the active material layer (3) to increase the adhesion of the current collector (1) and the active material layer (3).

2. The pole piece according to claim 1, characterized in that the width A of the adhesive coating (2) is not less than the width B of the active substance layer (3).

3. The pole piece according to claim 1, characterized in that the thickness of the adhesive coating (2) is 0.5-2 μm.

4. The pole piece according to claim 1, characterized in that the adhesive coating (2) is rectangular or parallelogram-shaped.

5. The pole piece according to claim 1, characterized in that the current collector (1) is provided with a coating area and coating empty foil areas on two opposite sides of the coating area;

6. The pole piece according to claim 1, characterized in that the adhesive coating (2) comprises an adhesive and a conductive agent.

7. The pole piece according to claim 1, characterized in that the current collector (1) is provided with cutting areas on two opposite sides, and the cutting areas on two opposite sides are arranged oppositely;

both sides the cutting district all is provided with adhesive coating (2), just adhesive coating (2) are kept away from scribble on the side of mass flow body (1) and are equipped with active material layer (3).

8. The pole piece according to claim 1, characterized in that the active substance layer (3) completely covers the adhesive coating (2).

9. The pole piece according to claim 1, characterized in that the length L of the adhesive coating (2) ranges from 6mm to 10mm.

10. A battery comprising a pole piece according to any one of claims 1 to 9.