Slit extrusion type die head gasket suitable for wide coating

Abstract

The utility model relates to a slit extrusion type die head gasket suitable for wide coating, which belongs to the technical field of manufacturing of lithium ion batteries for new energy automobiles, and comprises a gasket main body, the gasket main body is of a U-shaped structure, and the upper sides of two wings of the U-shaped gasket main body are respectively provided with a blank area. Two blank areas are arranged on the gasket main body 1, a first ceramic runner milling groove is arranged below each of the two blank areas, a second ceramic runner milling groove is arranged above each of the two blank areas, and a chamfer is arranged at the top point of each of two wings of the U-shaped gasket main body 1, so that the gasket can adapt to the manufacture of a lithium electrode plate with the coating width of 1000mm-1200mm through the unique design of the chamfers of the gasket; the problem of thick edge of the dressing is avoided, and the influence on the safety of the battery cell caused by the problems of poor lap joint of the ceramic and the dressing, easy generation of foil leakage and the like in the traditional pole piece production process is effectively solved through the unique design of the island and the ceramic runner milling groove depth.

Description

TECHNICAL FIELD

[0001] The utility model discloses a slit extrusion type die pad suitable for wide width coating belongs to lithium ion battery manufacturing technical field for new energy automobile. BACKGROUND

[0002] In the process of coating, generally need to thin the edge of coating. Its main reason is that the edge coating solvent of wet coating will evaporate, dry first in the process of baking. Due to the change of edge coating concentration and surface tension, the slurry of middle coating will migrate to the edge, finally leading to the edge of baking drum, causing the unqualified pole piece. In order to solve the problem of slurry edge migration, the chamfer structure is arranged on the pad to thin the edge in advance, and the drum edge problem caused by slurry migration is eliminated. The size of chamfer determines the degree of thinning and the amount of thinning, and the large chamfer thinning amount is large, and the thinning size is wide.

[0003] Chinese patent publication No. CN108480138B discloses a kind of extrusion coater die pad and die of uniform coating, the prior art, due to the narrow coating size, can not meet the demand of wide width coating, especially for the product when coating width is above 1000mm, the production capacity of cell pole piece manufacturing is seriously restricted. UTILITY MODEL CONTENTS

[0004] In order to solve the problem of narrow coating size in the prior art, which cannot meet the wide width coating, therefore, we propose a slit extrusion type die pad suitable for wide width coating.

[0005] The utility model discloses a slit extrusion type die pad suitable for wide width coating, as shown in Figures 1-2 The die pad comprises:

[0006] The pad body 1 is a N-shaped structure, the upper side of the two wings of the pad body 1 N-shaped is provided with a blank area 2, the lower side of the two blank areas 2 is provided with a first ceramic flow channel milling groove 3, the upper side of the two blank areas 2 is provided with a second ceramic flow channel milling groove 4, and the vertex of the two wings of the pad body 1 N-shaped is provided with a chamfer 5.

[0007] Further, the side of the second ceramic flow channel milling groove 4 close to the chamfer 5 is provided with an island 6, and the island 6 is the area between the side of the second ceramic flow channel milling groove 4 close to the chamfer 5 and the vertex of the chamfer.

[0008] Further, the two wings of the pad body 1 N-shaped are perpendicular to the bottom thereof.

[0009] Further, the chamfer 5 is configured with an angle in the range of 40°-70°, and the size of the chamfer 5 is configured in the range of 0mm-10mm, which is responsible for controlling the slurry edge flow.

[0010] Further, the inside distance between the two wings of the gasket body 1 is between 1000mm and 1100mm.

[0011] Further, the depths of the first ceramic flow channel milling groove 3 and the second ceramic flow channel milling groove 4 are both between 0.3mm and 0.5mm.

[0012] Further, the width of the island 6 is between 0.4mm and 0.6mm.

[0013] The beneficial effects of the utility model lie in:

[0014] 1. The unique design of the gasket chamfer makes the gasket adapt to the lithium electrode sheet manufacturing with a coating width of 1000mm-1200mm, and avoids the generation of thick edge problems of the dressing, and the unique design of the island and the ceramic flow channel milling groove depth effectively solves the problems of poor ceramic and dressing lap and easy foil leakage in the previous electrode production process, which affects the safety of the battery cell.

[0015] 2. The unique design of the gasket distance and the gasket thickness can meet the manufacturing and production of the positive electrode sheet with a coating width of 1000mm-1200mm and a surface density of 350g / m2 to 440g / m2, and the negative electrode sheet with a surface density of 180g / m2 to 250g / m2, effectively solving the problem of low surface density of the positive and negative electrode sheets due to the coating process process limitation, which causes low energy density of the battery cell.

[0016] 3. The design of the gasket makes the prepared positive and negative electrode sheets have many unique advantages, effectively improves the energy density and safety performance of the battery cell, simplifies the production process of the positive and negative electrode sheets, effectively guarantees the consistency of the manufactured electrode sheets, effectively reduces the scrap quantity at the process end, and guarantees the cost and safety of the electrode sheet preparation. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a schematic view of the overall structure of the utility model, wherein Figure 1 as the abstract drawing.

[0018] Figure 2 is Figure 1 an enlarged schematic view of a.

[0019] BRIEF DESCRIPTION OF DRAWINGS MARKS:

[0020] 1, gasket body, 2, blank area, 3, first ceramic flow channel milling groove, 4, second ceramic flow channel milling groove, 5, chamfer, 6, island. DETAILED DESCRIPTION

[0021] The following will give a specific implementation example of one of the utility models in combination with the drawings, and introduce the structure of the utility model in detail. It should be noted that the utility model is not limited to the following examples, and all similar structures based on the utility model are within the scope of the utility model.

[0022] The utility model discloses a slit extrusion type die gasket suitable for wide width coating, as shown in the drawing, the die gasket comprises: Figures 1-2

[0023] The gasket body 1 is a N-shaped structure, and each upper side of the two wings of the gasket body 1 N-shaped structure is provided with a blank area 2; each first ceramic flow channel milling groove 3 is arranged below the two blank areas 2; each second ceramic flow channel milling groove 4 is arranged above the two blank areas 2; and each chamfer 5 is arranged at the vertex of the two wings of the gasket body 1 N-shaped structure.

[0024] As a further introduction of the embodiment, each of the two second ceramic flow channel milling grooves 4 is provided with an island 6 close to one side of the chamfer 5; the island 6 is the area between one side of the second ceramic flow channel milling groove 4 close to the chamfer 5 and the vertex of the chamfer; because the slurry has the property of epitaxial diffusion on the flat surface, especially the slurry sprayed at high speed, the epitaxial diffusion property is more intense; the existence of the island makes the distance between the ceramic and the slurry for their own epitaxial diffusion when they are sprayed at high speed from their respective flow channel domains, and the existence of the island can effectively avoid the problem that the mixing width of the ceramic and the slurry is large.

[0025] As a further introduction of the embodiment, the two wings of the gasket body 1 N-shaped structure are perpendicular to the bottom thereof.

[0026] As a further introduction of the embodiment, the chamfer 5 is arranged at an angle in the range of 40°-70°, and the size of the chamfer 5 is arranged in the range of 0mm-10mm, which is responsible for controlling the flow of the slurry edge.

[0027] As a further introduction of the embodiment, the distance between the inner sides of the two wings of the gasket body 1 N-shaped structure is between 1000mm and 1100mm.

[0028] As a further introduction of the embodiment, the depth of the first ceramic flow channel milling groove 3 and the second ceramic flow channel milling groove 4 is between 0.3mm and 0.5mm.

[0029] As a further introduction of the embodiment, the width of the island 6 is between 0.4mm and 0.6mm. ​

[0030] The working principle of the utility model is described as follows:

[0031] When working, first install the gasket main body 1 between the upper and lower die heads, push the die head to the appropriate distance of the coating roller, open the foil traction and the coating pump valve to make the lithium battery slurry evenly coated on the foil surface, the inner side of the two wings of the gasket main body 1 restricts the slurry flow channel to make the slurry coated on the foil according to a certain opening size, the existence of the chamfer 5 makes the pressure of the edge area when the slurry is sprayed from the die lip weakened, the outflow pressure of the main coating area is small, the thick edge problem is solved, the ceramic slurry is coated on the foil through the first ceramic flow channel milling groove 3 and the second ceramic flow channel milling groove 4, the existence of the island 6 makes the degree of overlap and interpenetration of the ceramic slurry and the dressing material reduced, effectively ensuring the accurate continuous online monitoring of the dressing material width, finally through the continuous online monitoring of the CCD camera, accurately measuring whether the dressing material width meets the process requirements.

[0032] Up to now, the technical scheme of the utility model has been described in combination with the preferred embodiments shown in the drawings, but it is easy for those skilled in the art to understand that the protection scope of the utility model is obviously not limited to these specific embodiments. Those skilled in the art can make equivalent changes or replacements to the related technical features without departing from the principles of the utility model, and the technical schemes after the changes or replacements will all fall within the protection scope of the present application.

Claims

1. A slot-die die pad suitable for use in wide web coating, characterized in that, The die pad comprises: A pad body (1) is in the shape of a N, two wings of the pad body (1) are provided with a blank area (2) on the upper side respectively, a first ceramic flow channel milling groove (3) is arranged below the two blank areas (2) respectively, a second ceramic flow channel milling groove (4) is arranged above the two blank areas (2) respectively, and a chamfer (5) is arranged at the vertex of the two wings of the pad body (1).

2. A slot-die die pad suitable for use in wide format coating according to claim 1, wherein, The two second ceramic flow channel milling grooves (4) are provided with an island (6) on the side close to the chamfer (5), and the island (6) is the area between the side close to the chamfer (5) of the second ceramic flow channel milling groove (4) and the vertex of the chamfer.

3. A slot-die coating shim suitable for use in wide format coating according to claim 1, wherein, The two wings of the pad body (1) are perpendicular to the bottom.

4. The slot-die shim suitable for use in wide-web coating according to claim 1, wherein, The chamfer (5) is configured to have an angle in the range of 40°-70°, and the size of the chamfer (5) is configured to be in the range of 0mm-10mm, which is responsible for controlling the edge flow of the slurry.

5. A slot-die coating shim suitable for use in wide format coating according to claim 1, wherein, The distance between the inner sides of the two wings of the pad body (1) is between 1000mm and 1100mm.

6. A slot-die coating shim suitable for use in wide format coating according to claim 1, wherein, The depth of the first ceramic flow channel milling groove (3) and the second ceramic flow channel milling groove (4) is between 0.3mm and 0.5mm.

7. A slot-die coating shim suitable for use in wide format coating according to claim 2, wherein, The width of the island (6) is between 0.4mm and 0.6mm.

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