CN220072192U

CN220072192U - Extrusion type coating gasket of lithium ion battery

Info

Publication number: CN220072192U
Application number: CN202223573825.1U
Authority: CN
Inventors: 赵世元
Original assignee: Jiangsu Weifeng Power Industry Co ltd
Current assignee: Jiangsu Weifeng Power Industry Co ltd
Priority date: 2022-12-30
Filing date: 2022-12-30
Publication date: 2023-11-24
Anticipated expiration: 2032-12-30

Abstract

The utility model provides a extrusion type coating gasket of a lithium ion battery, which is a U-shaped frame and comprises a first guide vane and a second guide vane; the first guide vane comprises a first chamfer and the second guide vane comprises a second chamfer. The utility model has the beneficial effects that: the problem of the drum limit of pole piece coating is solved, the yields of lithium ion batteries are improved.

Description

Extrusion type coating gasket of lithium ion battery

Technical Field

The utility model belongs to the technical field of coating, and particularly relates to a coating gasket for a lithium ion battery.

Background

With the development of battery technology, lithium ion batteries are increasingly used. In the manufacturing process of lithium ion batteries, the coating process is extremely important. In the prior art, most of the materials are coated by extrusion, and positive and negative electrode slurries are uniformly coated on a foil by an extrusion coater. With the increase of the coating surface density, the prior art has some disadvantages: the common coating gasket has small thinning effect on the edge of the sizing agent with lower viscosity, so that obvious difference is generated between the edge of the sizing agent and the volatilization of the solvent in the sizing agent, active substances are gathered at the edge after the solvent in the sizing agent volatilizes, the thickness is increased, the coating rolling edge is cracked, the surface density is unstable, and the phenomenon of edge bulging is formed. The edge bulging phenomenon can seriously affect the yield and consistency of the manufactured pole pieces.

Disclosure of Invention

In view of the above, the present utility model is directed to providing a extrusion-type coating gasket for a lithium ion battery, so as to solve the problem of edge bulging of pole piece coating and improve the yield of the lithium ion battery.

In order to achieve the above purpose, the technical scheme of the utility model is realized as follows:

a lithium ion battery extrusion coated gasket.

The gasket is a U-shaped frame and comprises a first guide vane and a second guide vane; the first guide vane comprises a first chamfer and the second guide vane comprises a second chamfer.

Further, the first guide vane is positioned at the left upper side of the U-shaped frame and is parallel to the bottom edge of the U-shaped frame; the second guide vane is positioned at the left upper side of the U-shaped frame and is parallel to the bottom edge of the U-shaped frame.

Further, the first guide vane and the second guide vane are arranged opposite to each other, and the first guide vane and the second guide vane are the same in size and dimension to form symmetry.

Further, the first chamfer is positioned at the right upper corner of the first guide vane, and the dimension of the first chamfer is 1mm by 1.6mm, the transverse dimension is 1.6mm, and the longitudinal dimension is 1mm; the second chamfer is positioned at the left upper corner of the second guide vane, has the same size as the first chamfer and is symmetrical with the first chamfer.

Further, the first chamfer comprises two small chamfers, the two small chamfers are positioned at two corners of the first chamfer, the two small chamfers are 0.1mm in size and side length, and the angle is 10 degrees; the second chamfer comprises two small chamfers, the two small chamfers are positioned at two edges of the second chamfer, the size and the angle of the small chamfers are the same as those of the small chamfers of the first chamfer, and the small chamfers are symmetrical.

Further, the gasket comprises a plurality of through holes, and the through holes are symmetrically distributed on the gasket.

Further, the gasket is a 304 stainless steel plate, and the thickness is between 0.8mm and 1.2 mm.

Compared with the prior art, the extrusion type coating gasket for the lithium ion battery has the following beneficial effects:

(1) According to the extrusion type coating gasket of the lithium ion battery, disclosed by the utility model, the fractal structure of the large chamfer and the small chamfer is adopted, so that the thinning effect of the gasket on slurry is effectively enhanced in the process of coating a pole piece of the lithium ion battery, and the extrusion type coating gasket can be suitable for slurry with a lower viscosity range;

(2) According to the extrusion type coating gasket for the lithium ion battery, the axisymmetric structure of the gasket enables slurry to be coated more flatly and uniformly;

(3) According to the extrusion type coating gasket for the lithium ion battery, disclosed by the utility model, the side length of the small chamfer angle is 0.1mm, the angle is 10 degrees, and the phenomenon of thick coating can be restrained or even eliminated when coating work is carried out.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model. In the drawings:

fig. 1 is a schematic plan view of a extrusion coated gasket for a lithium ion battery according to an embodiment of the present utility model;

FIG. 2 is an enlarged view of a portion of a extrusion coated gasket for a lithium ion battery according to an embodiment of the present utility model;

fig. 3 is an enlarged view illustrating chamfering of a extrusion coated gasket for a lithium ion battery according to an embodiment of the present utility model.

Reference numerals illustrate:

1-a first deflector; 2-a second deflector; 3-a first chamfer; 4-a second chamfer; 5-through holes; 6-small chamfering.

Detailed Description

It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other.

The utility model will be described in detail below with reference to the drawings in connection with embodiments.

With the increase of the coating surface density, the existing extrusion coating technology for lithium batteries has some disadvantages: the common coating gasket has small thinning effect on the edge of the sizing agent with lower viscosity, so that obvious difference is generated between the edge of the sizing agent and the volatilization of the solvent in the sizing agent, active substances are gathered at the edge after the solvent in the sizing agent volatilizes, the thickness is increased, the coating rolling edge is cracked, the surface density is unstable, and the phenomenon of edge bulging is formed. The edge bulging phenomenon can seriously affect the yield and consistency of the manufactured pole pieces.

As shown in fig. 1-3, a lithium ion battery extrusion coating gasket is an integrated sheet with equal wall thickness, and preferably, the gasket is made of 304 stainless steel or a material with better hardness and wear resistance. The thickness of the gasket is between 0.8mm and 1.2mm, and can be determined according to the requirements of products, and the thicker the coating thickness is, the thicker the gasket is required, and the preferable thickness is 1mm. The spacer includes a plurality of through holes 5, the through holes 5 being symmetrically distributed on the spacer, the through holes 5 supporting mounting holes as the spacer.

Coating of lithium ion battery pole pieces typically requires the production of strip-shaped pole pieces, which are accomplished primarily by designing the flow channels through shims that are secured between upper and lower dies. The shape of the shim can affect the velocity profile of the fluid in the die and ultimately the morphology of the coating, particularly the morphology of the coating edges. The outlet shape of the slit gasket is optimized, the flowing speed direction and the size of slurry can be changed, the stress state of edge slurry is reduced, and the thick edge phenomenon of a coating is weakened or eliminated.

As shown in fig. 1, the gasket preferably has a u-shaped frame shape that improves the uniformity of coating. The gasket comprises a first deflector 1 and a second deflector 2, the first deflector 1 is provided with a first chamfer 3, and the second deflector 2 is provided with a second chamfer 4. The first guide vane 1 is positioned at the left upper side of the U-shaped frame, the first guide vane 1 is parallel to the bottom edge of the U-shaped frame, the second guide vane 2 is positioned at the left upper side of the U-shaped frame, and the second guide vane 2 is parallel to the bottom edge of the U-shaped frame. The first guide vane 1 and the second guide vane 2 are arranged in opposite directions, and the size of the first guide vane and the second guide vane are the same, and the gasket forms an axisymmetric structure when being seen on the front surface, so that the slurry is coated more flatly and uniformly.

As shown in fig. 2-3, the first chamfer 3 is preferably located at the upper right corner of the first baffle 1, and has a dimension of 1mm by 1.6mm, a transverse dimension of 1.6mm, and a longitudinal dimension of 1mm, depending on the product requirements. The second chamfer 4 is located in the upper left corner of the second deflector 2 and has the same dimensions as the first chamfer 3, and the gasket and the first chamfer 3 form an axisymmetric structure when seen from the front. The first chamfer 3 comprises two small chamfers 6, the two small chamfers 6 are positioned at two corners of the first chamfer 3, and according to the actual use condition, when the side length of the size of the two small chamfers 6 is 0.1mm and the angle is 10 degrees, the gasket has a good effect on the edge thinning of the slurry, and the occurrence probability of the thick edge coating phenomenon is small. The specific dimensions of the gasket may be based on a combination of coating thickness, gasket manufacturing tolerances, etc. The second chamfer 4 comprises two small chamfers 6, the two small chamfers 6 are positioned at the two corners of the second chamfer 4, the size and the angle of the small chamfers are the same as those of the small chamfers 6 of the first chamfer 3, and the gasket forms an axisymmetric structure when seen from the front. Through the fractal structure of the large chamfer opening small chamfer 6, the thinning effect of the gasket on the slurry is effectively enhanced in the pole piece coating process of the lithium battery, and the slurry with a lower viscosity range can be applied. The dimension relation between the chamfer of the gasket and the appearance of the gasket is integrated, and the phenomenon of thick coating edges can be restrained or even eliminated when the gasket and the appearance of the gasket work.

After the gasket is used, in the practical lithium battery pole piece coating production process, the coating thinning width is increased from 5mm to 10mm, the coating edge is free of bulging, the rolling is smooth, no bulging crack exists after rolling, the appearance is good, the production requirement is met, and the yield and consistency of the lithium battery pole piece coating are improved. Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model, and are intended to be included within the scope of the appended claims and description.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.

Claims

1. The utility model provides a lithium ion battery extrusion formula coating gasket which characterized in that: the gasket is a U-shaped frame and comprises a first guide vane (1) and a second guide vane (2); the first guide vane (1) comprises a first chamfer (3), and the second guide vane (2) comprises a second chamfer (4);

the first guide vane (1) is positioned at the left upper side of the U-shaped frame, and the first guide vane (1) is parallel to the bottom edge of the U-shaped frame; the second flow deflector (2) is positioned at the left upper side of the U-shaped frame, and the second flow deflector (2) is parallel to the bottom edge of the U-shaped frame;

the first guide vane (1) and the second guide vane (2) are arranged opposite to each other, and the size and the dimension are the same to form symmetry;

the first chamfer (3) is positioned at the right upper corner of the first guide vane (1), and has the size of 1mm by 1.6mm, the transverse direction of 1.6mm and the longitudinal direction of 1mm; the second chamfer (4) is positioned at the left upper corner of the second guide vane (2), has the same size as the first chamfer (3), and is symmetrical with the first chamfer (3);

the first chamfer (3) comprises two small chamfers (6), the two small chamfers (6) are positioned at two edges of the first chamfer (3), the dimension side length of the two small chamfers (6) is 0.1mm, and the angle is 10 degrees; the second chamfer (4) comprises two small chamfers (6), the two small chamfers (6) are positioned at two edges of the second chamfer (4), and the size and the angle of the small chamfers are the same as those of the small chamfers (6) of the first chamfer (3) and form symmetry.

2. The extrusion coated gasket of claim 1, wherein: the gasket comprises a plurality of through holes (5), and the through holes (5) are symmetrically distributed on the gasket.

3. The extrusion coated gasket of claim 1, wherein: the gasket is a 304 stainless steel plate, and the thickness is between 0.8mm and 1.2 mm.