CN216573938U

CN216573938U - Extrusion coating gasket device

Info

Publication number: CN216573938U
Application number: CN202123115696.7U
Authority: CN
Inventors: 何锦镖; 江英凯; 程受兵
Original assignee: Guangdong Haozhi Technology Co Ltd
Current assignee: Guangdong Haozhi Technology Co Ltd
Priority date: 2021-12-13
Filing date: 2021-12-13
Publication date: 2022-05-24
Anticipated expiration: 2031-12-13

Abstract

The utility model discloses an extrusion coating gasket device which comprises a long baffle, a short baffle, a transverse baffle and a screw hole, wherein one end of the transverse baffle is provided with a guide groove, and the edge of the transverse baffle is provided with a chamfer angle. The operation principle of the utility model is that after the slurry is arranged in the machine head of the extrusion coating machine, the slurry can be dispersed towards two sides and enter the guide groove due to the existence of the guide groove. Therefore, when the device is used for coating, the conditions that the edge of the coating is too thick and the edge is bulged can be avoided. The coating prepared by the method has more uniform surface, and the defective products produced in the coating process are less. The gasket device of the utility model can be compatible with the existing extrusion coating machine and is very flexible in use.

Description

Extrusion coating gasket device

Technical Field

The utility model belongs to the field of coating technology, and particularly relates to a gasket device for an extrusion coating machine.

Background

Coatings are often used in battery preparation, film technology, packaging materials, circuit board printing, wire or cable, and biomedical applications. It follows that the process for preparing the coating is versatile and one of the most important processes in industrial production.

There are many ways of preparing coatings, extrusion coating being the most common in industrial production. Coating is an essential process in the production process of batteries, and in the extrusion coating process, slurry is extruded from the gap of the head of a coating machine and coated on a current collector. However, the coating produced by the conventional extrusion coater has a problem that both side edges of the coating are thick. This phenomenon, which may be referred to as "edge bulging," can easily cause non-uniform thickness and compaction density of the pole piece, can cause problems with battery performance and consistency, and can, in severe cases, cause pole piece breakage or cause coating deformation or peeling.

The problem to be solved by the present invention is therefore to provide a shim device which can be arranged in the head of a die coater and with which the coating produced by means of the device according to the utility model avoids the problem of bulging, so that a coating of excellent morphology is obtained.

SUMMERY OF THE UTILITY MODEL

The coating produced by the conventional extrusion coater has a problem of thick edges. In order to solve the problems, the utility model adopts the following technical scheme:

the utility model relates to an extrusion coating gasket device which is assembled in a machine head of an extrusion coating machine, so that slurry can be dispersed to two sides without being concentrated in the middle, and the problem of edge bulging is avoided.

The utility model has the beneficial effects that: after the gasket device is used in the head of an extrusion coating machine, the condition of edge bulging can be completely avoided, and therefore, a uniform and flat coating is obtained. In addition, the gasket device of the utility model can be compatible with the existing extrusion coating machine, so that the use is flexible and convenient.

Drawings

Fig. 1 is a schematic view of the overall structure of the gasket device of the present invention.

Fig. 2 is a schematic view of the structure of the lateral baffle (3) of the spacer device of the present invention.

Fig. 3 is a schematic structural view of the transverse baffle (3) of the spacer device of the present invention, showing the critical dimensions (a), (b), (c), (d) and (e).

Fig. 4 is a schematic view of the structure of the edge of the lateral baffle (3) of the spacer device of the present invention.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

The utility model relates to an extrusion coating gasket device used in an extrusion coating machine. In the prior art, the head of an extrusion coater has a shim. The shim is "C" shaped with a uniform thickness, with the void forming a gap through which the slurry is extruded from the die. Meanwhile, the gasket of the extrusion coater in the prior art is usually fixed on the head by screws, so that the gasket has a plurality of screw holes.

Fig. 1 is a schematic view of the overall structure of the gasket device of the present invention. Since the shim device is compatible with existing extrusion coaters. In some embodiments, the devices of the present invention have a bilaterally symmetric structure. In other embodiments, the structure of the device of the present invention may also be asymmetric. Thus, as can be seen in fig. 1, the gasket device of the present invention is "C" shaped, said device comprising a long flap (1), a short flap (2) and a transverse flap (3). Wherein the short baffle (2) comprises a first short baffle (2a) and a second short baffle (2 b). The transverse baffle (3) comprises a first transverse baffle (3a) and a second transverse baffle (3 b). In some embodiments, the first cross baffle (3a) is separate from the second cross baffle (3 b). In some embodiments, the short baffles (2) are perpendicular to the long baffles (1) and the transverse baffles (3) are perpendicular to the short baffles (2). In other embodiments, the gasket device is provided with a plurality of screw holes (6) on the long baffle (1) and the short baffle (2).

The material of the gasket device of the present invention is not particularly limited, but the material should be capable of blocking the slurry in the head from the outside, be not easily corroded, be resistant to high temperature, and be acid and alkali resistant. In some embodiments, the material of the gasket device of the present invention is selected from the group consisting of metal, plastic, harder rubber, and combinations thereof.

The length, width and thickness of the long baffle (1) and the short baffle (2) are not particularly limited, but since the spacer device of the present invention is applicable to the head of the existing extrusion coater, it is preferable that the length, width and thickness of the long baffle (1) and the short baffle (2) are the same as or similar to those of the existing extrusion coater spacer. Likewise, the number, size and position of the screw holes (6) on the long baffle (1) and the short baffle (2) also preferably correspond to the screw holes in the head of the existing extrusion coater.

One end of the transverse baffle (3) is provided with a guide groove (4). Fig. 2 shows the structure of the guide groove (4) in the gasket device. As can be seen from fig. 2, the boundary portion of the lateral baffle (3) is thinned to form the guide groove (4). Due to the existence of the guide groove (4), the slurry can be dispersed into the guide groove towards two sides, so that the thickness of the coating at the edge is the same as that of the coating on the surface at other positions, and the problem of edge bulging of the coating is solved. Fig. 3 shows some key dimensions of the cross bar (3) and guide slot (4) in the spacer device, (a), (b), (c), (d) and (e). Wherein (a) represents the width of the transverse baffle (3), (b) represents the thickness of the transverse baffle (3), (c) represents the depth of the guide groove (4), (d) represents the length of the guide groove (4), and (e) represents the thickness of the guide groove (4).

In order to make the slurry flow smooth when the spacer device of the present invention is used in the head of an extrusion coater, it is preferable that the guide groove (4) is linear. In some embodiments, the width (a) of the cross baffle (3) is about 30 mm to about 50 mm, about 32 mm to about 50 mm, about 34 mm to about 50 mm, about 36 mm to about 50 mm, about 38 mm to about 50 mm, about 40 mm to about 50 mm, about 42 mm to about 50 mm, about 44 mm to about 50 mm, about 46 mm to about 50 mm, about 30 mm to about 40 mm, about 32 mm to about 40 mm, about 34 mm to about 40 mm, or about 36 mm to about 40 mm. In some embodiments, the guide groove (4) and the cross bar (3) both have the same width (a).

The thickness (b) of the transverse baffle (3) is also not particularly limited, and it is preferable that the thickness (b) of the transverse baffle (3) is the same as or similar to the long baffle (1) and the short baffle (2). In some embodiments, the thickness (b) of the cross baffle (3) is about 0.8mm to about 1.2mm, about 0.85 mm to about 1.2mm, about 0.9 mm to about 1.2mm, about 0.95 mm to about 1.2mm, about 1 mm to about 1.2mm, about 1.05 mm to about 1.2mm, about 1.1 mm to about 1.2mm, about 0.8mm to about 1.1 mm, about 0.85 mm to about 1.1 mm, about 0.9 mm to about 1.1 mm, about 0.95 mm to about 1.1 mm, about 1 mm to about 1.1 mm, about 0.8mm to about 1 mm, about 0.85 mm to about 1 mm, about 0.9 mm to about 1 mm, about 0.8mm to about 0.9 mm, or about 0.85 mm to about 0.9 mm.

As described earlier, the guide groove (4) is formed by thinning the boundary of the lateral barrier (3) to a desired thickness, so that the guide groove (4) has a depth (c) with respect to the lateral barrier (3). The thickness (e) of the guide groove (4) can be obtained by subtracting the depth (c) of the guide groove (4) from the thickness (b) of the transverse baffle (3).

The problem of uneven pole piece thickness can be solved by controlling the depth of the guide groove (4) and the proportion of the depth (c) of the guide groove (4) relative to the thickness (b) of the transverse baffle plate (3). The depth (c) of the guide groove (4) is preferably about 0.3 mm to about 0.7 mm. In certain embodiments, the depth (c) of the guide slot (4) is from about 0.35 mm to about 0.7 mm, from about 0.4 mm to about 0.7 mm, from about 0.45 mm to about 0.7 mm, from about 0.5 mm to about 0.7 mm, from about 0.55 mm to about 0.7 mm, from about 0.6 mm to about 0.7 mm, from about 0.3 mm to about 0.6 mm, from about 0.35 mm to about 0.6 mm, from about 0.4 mm to about 0.6 mm, from about 0.45 mm to about 0.6 mm, from about 0.5 mm to about 0.6 mm, from about 0.3 mm to about 0.5 mm, from about 0.35 mm to about 0.5 mm, from about 0.4 mm to about 0.5 mm, from about 0.3 mm to about 0.4 mm, or from about 0.35 mm to about 0.4 mm.

In some embodiments, the ratio between the depth (c) of the guide slot (4) and the thickness (b) of the cross bar (3) is about 1:3 to about 2:3, about 11:30 to about 2:3, about 2:5 to about 2:3, about 13:30 to about 2:3, about 7:15 to about 2:3, about 1:2 to about 2:3, about 8:15 to about 2:3, about 17:30 to about 2:3, about 3:5 to about 2:3, about 1:3 to about 3:5, about 11:30 to about 3:5, about 2:5 to about 3:5, about 13:30 to about 3:5, about 7:15 to about 3:5, about 1:2 to about 3:5, about 1:3 to about 1:2, about 11:30 to about 1:2, about 2:5 to about 1:2, about 13:30 to about 1:2, or about 1: 15 to about 2: 5.

In some embodiments, the length (d) of the guide slot (4) is about 3 mm to about 8mm, about 3.5 mm to about 8mm, about 4 mm to about 8mm, about 4.5 mm to about 8mm, about 5 mm to about 8mm, about 5.5 mm to about 8mm, about 6 mm to about 8mm, about 3 mm to about 6 mm, about 3.5 mm to about 6 mm, about 4 mm to about 6 mm, about 4.5 mm to about 6 mm, about 3 mm to about 5 mm, about 3.5 mm to about 5 mm, or about 4 mm to about 5 mm.

Fig. 4 shows a structure in which a chamfer (5) is provided at the edge of the guide groove (4) in the gasket device. The advantage of providing the chamfer (5) is that when the gasket device of the utility model is used in the head of an extrusion coater, the chamfer (5) can control the flow rate of the slurry when the slurry flows out when the pressure exerted by the slurry in the head is a certain degree, and therefore the situation that the coating made after the slurry is coated has edge bulging can be further avoided.

The gasket device of the utility model is used in the head of an extrusion coater. A preferred embodiment of the utility model is used as follows:

two parts of a machine head of the extrusion coating machine are opened, the gasket device is installed in the machine head, the screw is screwed, and the gasket device is fixed. Thereafter, the two sections of the head are closed, and the slurry coating can be performed using a squeeze coater.

The thick edge phenomenon may cause uneven current distribution during charging and discharging, and easily forms polarization. When the gasket device of the utility model is used in the head of an extrusion coater, the coater can uniformly coat slurry on a current collector due to the special structural function of the gasket device, so that the coating obtained after drying is flat and no edge bulging occurs. The above embodiments and drawings are not intended to limit the form and style of the present invention, and any suitable changes or modifications thereof by those skilled in the art should be considered as not departing from the scope of the present invention.

Claims

1. An extrusion coating gasket device, characterized in that the device comprises a long baffle (1), a short baffle (2), a transverse baffle (3), wherein the short baffle (2) is perpendicular to the long baffle (1), wherein the transverse baffle (3) is perpendicular to the short baffle (2), wherein the transverse baffle (3) comprises a first transverse baffle (3a) and a second transverse baffle (3b), and the first transverse baffle (3a) is separated from the second transverse baffle (3b), and one end of the transverse baffle (3) is provided with a guide groove (4), and wherein the guide groove (4) and the transverse baffle (3) both have the same width (a).

2. Device according to claim 1, characterized in that the edges of the guide groove (4) of the transverse baffle (3) are rectilinear.

3. The device according to claim 1, characterized in that the width (a) of the guide groove (4) and the transverse baffle (3) is about 30 mm to about 50 mm.

4. Device according to claim 1, characterized in that the cross bar (3) has a thickness (b) and the guide groove (4) has a depth (c), wherein the ratio between the depth (c) of the guide groove (4) and the thickness (b) of the cross bar (3) is in the range of 1:3-2: 3.

5. The device according to claim 4, characterized in that the depth (c) of the guide groove (4) is about 0.3 mm to about 0.7 mm.

6. The device according to claim 4, characterized in that the thickness (b) of the cross baffle (3) is about 0.8mm to about 1.2 mm.

7. The device according to claim 1, wherein the guide groove (4) has a length (d), wherein the length (d) of the guide groove (4) is about 3 mm to about 8 mm.

8. The device of claim 1, wherein the device has a symmetrical configuration.

9. Device according to claim 2, characterized in that the two corners of one end of the guide groove (4) are chamfered (5).

10. Device according to claim 1, characterized in that it further comprises a plurality of screw holes (6).