Coating salient point arranging and coating system

Abstract

The invention discloses a coating salient point arrangement which comprises an isolating membrane, a plurality of coating salient points are arranged on the coating surface of the isolating membrane, and the coating salient points are in irregular salient point shapes or linear shapes. The coating salient points are irregular salient point-shaped or linear, round points can be changed into polygons such as triangles, quadrangles, polygons and plum blossom-shaped polygons, the peripheral area of the salient points is increased under the same salient point projection area, the contact area of electrolyte is increased, the compactness is reduced, and the polygonal structure is more stable under the same salient point projection area. And the risk of being scratched off during winding can be reduced. The linear shape can be made into dotted lines, solid lines, parallel lines, crossed lines or circular rings, and parts of PVDF on the front and back surfaces of the diaphragm are overlapped, so that the problem of insufficient electrolyte storage solution space after lamination of the positive and negative electrodes and the diaphragm can be solved after lamination. For a point-shaped plate roller, the probability of single-point abrasion or falling is large, but a linear plate roller can well avoid the problem.

Description

Technical Field

[0001] The invention relates to coating technology, and in particular to a coating convex point arrangement and a coating system. Background Art

[0002] At present, in the field of manufacturing diaphragms and pole pieces in the battery industry, in the field of manufacturing breathable films and non-woven fabrics in the sanitary packaging industry, and in the field of manufacturing protective films in the electronics industry, it is necessary to use coating technology to form a non-full coverage coating layer. For details, please refer to Figure 1 , 2 , which is an existing circular coating method, includes a positive electrode 101, a negative electrode 102, a separator 103, and a coating point 104.

[0003] The patent document with application number "CN202220419382.1" discloses a relief roller and its transfer convex point. The transfer convex point is designed to a specific shape, specifically including a busbar concave, a busbar convex, a straight busbar conical platform structure or a stepped platform structure, wherein the transfer end surface area of ​​the transfer convex point is much smaller than the cross-sectional area of ​​the material storage groove, so as to facilitate the transfer end of the transfer convex point to be inserted into the material storage groove of the anilox roller, thereby utilizing the tension of the coating rubber material to make the coating rubber material adhere to the transfer end of the transfer convex point and form a spherical or ellipsoidal coating rubber material droplet, and the coating rubber material droplet will not squeeze the coating film during the transfer process, but is mainly transferred to the coating film by dripping through the tension difference of the coating rubber droplet on different materials.

[0004] The patent document with application number "CN202210192239.8" discloses a lithium battery diaphragm dispensing coating device. The present invention mainly includes a coating transfer device, a feed amount controller and a flat bottom roller, wherein the coating transfer device includes a rubber material holding device and a relief roller, the rubber material holding device is provided with a material holding groove for holding the rubber material, and the roller surface of the relief roller is provided with a transfer convex point; the relief roller is located between the rubber material holding device and the flat bottom roller, and the transfer convex point is inserted into the material holding groove at the contact point between the relief roller and the rubber material holding device; the feed amount controller is used to detect and adjust the feed amount of the transfer convex point inserted into the material holding groove; the flat bottom roller is located at the lower side of the relief roller, and a film-penetrating gap for the coating film to pass through is provided between the flat bottom roller and the relief roller.

[0005] The patent document with application number "CN202210189717.X" discloses a method for dispensing glue and a lithium battery separator prepared therefrom. In order to meet the production needs of preparing a thicker dot coating layer on a thin film or a pole piece in the battery industry, the sanitary packaging industry and the electronic industry, the present invention proposes a method for dispensing glue, firstly using an anilox roller to transfer the coating rubber in the hopper to the material holding groove on the anilox roller, then inserting the transfer convex point on the relief roller into the material holding groove on the anilox roller and leaving the material holding groove as the relief roller and the anilox roller rotate, and at the same time using the tension of the coating rubber itself to bring the coating rubber out of the material holding groove, and forming a coating rubber droplet in an approximately spherical or ellipsoidal shape on the transfer end of the transfer convex point; finally, the coating rubber droplet is mainly dripped on the coating film under the action of the tension difference on different materials, thereby forming a non-full coverage coating layer on the coating film.

[0006] The above patent document combined with the prior art reveals that the existing coating bump arrangement has the following defects:

[0007] 1. The inside of the dot-coated spots is relatively dense, which affects the penetration of lithium ions and the air permeability is relatively low.

[0008] 2. When double-sided coating is performed, that is, PVDF is dotted on both sides, after the positive electrode, diaphragm, and negative electrode are pressed together, if the positions of the dots on the front and back of the diaphragm do not overlap, the storage space for the electrolyte will be further reduced after pressing. When double-sided coating is performed, the coating dots on the front and back of the diaphragm are unlikely to overlap, which cannot satisfy the customer's pursuit of large storage space.

[0009] 3. If the diameter of the dot is relatively small and the height is relatively high, the dot and the film will scrape against each other during the process of winding the material roll after the product is coated, and the dot is easily scraped off. The existing method is to add a layer of isolation film in front of the winding station, and roll the isolation film and the diaphragm together during winding to protect the dot from being scratched off. Adding a layer of isolation film will increase some costs, and the isolation film is not easy to reuse. At the same time, it affects the production speed, increases the difficulty of equipment manufacturing, and increases the difficulty and cost of the production process.

[0010] 4. The characterization data is inaccurate during measurement. Customers use multiple layers to measure the thickness and then take the average value. In this way, the average value of multiple layers is often smaller than the standard data of a single layer. Regular point coating is likely to be staggered, resulting in thinning of the thickness. Summary of the invention

[0011] In order to overcome the deficiencies of the prior art, the present invention provides a coating bump arrangement and coating system, which solves the problems of density and the like.

[0012] A first aspect of the present invention is to provide a coating bump arrangement, comprising an isolation film, a plurality of coating bumps are arranged on the coating surface of the isolation film, and the coating bumps are in irregular bump shape or line shape.

[0013] In the first aspect of the present invention, as a preferred embodiment, the shape of the coating protrusions is one or more of a triangle, a quadrilateral, a polygon, and a plum blossom.

[0014] In the first aspect of the present invention, as a preferred embodiment, the plurality of coating protrusions are arranged in a dotted line shape to form a plurality of dotted line arrays.

[0015] In the first aspect of the present invention, as a preferred embodiment, the dotted line formation is in a straight line shape.

[0016] In the first aspect of the present invention, as a preferred embodiment, among the plurality of dotted line formations, at least two dotted line formations are parallel to each other.

[0017] In the first aspect of the present invention, as a preferred embodiment, among the plurality of dotted line formations, at least two dotted line formations are crossed together.

[0018] In the first aspect of the present invention, as a preferred embodiment, the dotted line formation is ring-shaped.

[0019] In the first aspect of the present invention, as a preferred embodiment, the plurality of coating protrusions are arranged in a solid line to form a plurality of solid line arrays.

[0020] In the first aspect of the present invention, as a preferred embodiment, the solid line array is in a straight line shape.

[0021] In the first aspect of the present invention, as a preferred embodiment, among the plurality of solid line formations, at least two solid line formations are parallel to each other.

[0022] In the first aspect of the present invention, as a preferred embodiment, among the plurality of solid line formations, at least two solid line formations are crossed together.

[0023] In the first aspect of the present invention, as a preferred embodiment, the solid line array is ring-shaped.

[0024] A second aspect of the present invention provides a coating system, comprising a plate roller, on which the above-mentioned coating convex point arrangement is correspondingly arranged.

[0025] In the second aspect of the present invention, as a preferred embodiment, corresponding to the dotted line array in a ring shape, the transfer protrusions on the plate roller include an upper connecting part and a lower connecting part, the cross-section of the lower connecting part is conical, and the upper end of the lower connecting part is connected to the lower part of the upper connecting part.

[0026] In the second aspect of the present invention, as a preferred embodiment, the transfer convex points on the plate roller are triangular in shape, and the transfer convex points include a dot coating portion with the dots located on the upper side and a base located below the dot coating portion, the dot coating portion is an equilateral triangle, the base is conical, and the upper part of the base is connected to the lower part of the dot coating portion.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] 1. The coated convex dots are irregular convex dot or line-shaped. The dots can be changed into polygons such as triangles, quadrilaterals, polygons, plum blossoms, etc. Under the same convex dot projection area, the surface area around the convex dots is increased to increase the electrolyte contact area and reduce the density. Under the same convex dot projection area, the polygonal structure will be more stable, which is conducive to reducing the risk of being scratched during winding.

[0029] 2. The dot coating can be changed to be similar to a line. The line can be made into a dotted line, a solid line, a parallel line, a cross line, or a circle. In this way, when double-sided coating is applied, a part of the PVDF on the front and back sides of the diaphragm must overlap. After pressing, it can be ensured that this can solve the problem of insufficient storage space for the electrolyte after the positive and negative electrodes and the diaphragm are pressed. In addition, whether the customer uses single-layer measurement or multi-layer measurement, a relatively accurate thickness value can be measured. At the same time, the service life of the linear version roller will be longer than that of the dot version roller. For the dot version roller, the probability of single-point wear or falling off is relatively high, but the linear version roller can well avoid the occurrence of this problem. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a schematic diagram of an existing coating method;

[0031] Figure 2 is another schematic diagram of an existing coating method;

[0032] Figure 3 Schematic diagram of irregular coating;

[0033] Figure 4 It is a schematic diagram of dotted line coating;

[0034] Figure 5 It is a dotted coating diagram in a cross shape;

[0035] Figure 6 It is a dotted coating diagram in the shape of a ring;

[0036] Figure 7 It is a schematic diagram of coating with parallel short solid lines;

[0037] Figure 8 It is a cross-shaped solid line coating diagram;

[0038] Fig. 9 It is a ring-shaped solid coating diagram;

[0039] Fig.10 A structural diagram of the transfer bump in the first embodiment;

[0040] Fig.11 FIG. 4 is a structural diagram of the transfer bump in the second embodiment.

[0041] In the figure: 101, positive electrode; 102, negative electrode; 103, diaphragm; 104, coating point; 10, isolation membrane; 20, coating bump; 200, dotted line formation; 40, solid line formation; 31, upper connecting part; 32, lower connecting part; 41, dot coating part; 42, base. DETAILED DESCRIPTION

[0042] Below, in conjunction with the accompanying drawings and specific embodiments, the invention is further described. It should be noted that, under the premise of no conflict, the various embodiments described below or the various technical features can be arbitrarily combined to form a new embodiment. Except as otherwise specified, the materials and equipment used in this embodiment can be purchased from the market. Examples of the embodiments are shown in the accompanying drawings, in which the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0043] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present application. In the description of the present application, "plurality" means two or more, unless otherwise precisely and specifically specified.

[0044] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, or it can be connected through an intermediary medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0045] The terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0046] like Figure 3-9 As shown, a coating bump arrangement includes an isolation film 10, and a plurality of coating bumps 20 are arranged on the coating surface of the isolation film 10, and the coating bumps 20 are irregular bumps or lines. Specifically, the dots can be changed into polygons such as triangles, quadrilaterals, polygons, and plum blossoms. Under the same projection area of ​​the bumps, the surface area around the bumps is increased to increase the contact area with the electrolyte and reduce the density. Under the same projection area of ​​the bumps, the polygonal structure will be more stable, which is conducive to reducing the risk of being scratched when rolling up.

[0047] It should be noted that when the coating bump 20 is in a linear shape, the width and length of the line can be customized. The width of the line is generally 50-1000um, and the length of the line can be segmented or continuous, and can be specifically adjusted adaptively. Please refer to 3 for details. The shape of the coating bump 20 is one or more of a triangle, a quadrilateral, a polygon, and a plum blossom.

[0048] In the first aspect of the present invention, as a preferred embodiment, please refer to 4-6 for details, a plurality of the coating convex points 20 are arranged in a dotted line shape to form a plurality of dotted line arrays. For the linear shape, the dot coating can be changed to be similar to the linear shape, and the linear shape can be made into a dotted line, a solid line, a parallel line, a cross line, or a circular ring. In this way, when double-sided coating is applied, a part of the PVDF on the front and back sides of the diaphragm must overlap, and after pressing, it can be ensured that this can solve the problem of insufficient electrolyte storage space after the positive and negative electrodes and the diaphragm are pressed. In addition, whether the customer uses single-layer measurement or multi-layer measurement, a relatively accurate thickness value can be measured. At the same time, the service life of the linear version roller will be longer than that of the dot-shaped version roller. For the dot-shaped version roller, the probability of single-point wear or falling off is relatively large, but the linear version roller can well avoid the occurrence of this problem.

[0049] In the first aspect of the present invention, as a preferred embodiment, please refer to 4-5 for details, the dotted line formation 200 is in a straight line shape. In one embodiment, among the multiple dotted line formations 200, at least two dotted line formations 200 are parallel to each other. In another embodiment, among the multiple dotted line formations 200, at least two dotted line formations 200 are crossed together.

[0050] In the first aspect of the present invention, as a preferred embodiment, please refer to 5, the dotted line array 200 is annular. As a display method of the present application, please refer to 7-9, a plurality of the coating convex dots 20 are arranged in a solid line to form a plurality of solid line arrays 300.

[0051] In the first aspect of the present invention, as a preferred embodiment, please refer to 7-8 for details, the solid line formation 300 is in a straight line shape. In one embodiment, among the plurality of solid line formations 300, at least two solid line formations 300 are parallel to each other. In another embodiment, among the plurality of solid line formations 300, at least two solid line formations 300 are crossed together.

[0052] In the first aspect of the present invention, as a preferred embodiment and as a presentation method of the present application, please refer to 9 for details. The solid line formation 300 is ring-shaped.

[0053] In summary, the coating point arrangement of the present application has the following advantages:

[0054] 1. Reduce the density of the point, increase the air permeability, and improve the battery effect. The better the air permeability is, the faster and more efficient the lithium ions penetrate the diaphragm.

[0055] 2. In order to prevent the coating point from being scratched, existing customers deliberately add a set of mechanisms before winding to compound the isolation film and coating film together, and then wind them together into a roll to protect the coating point. However, this will increase the complexity of the equipment and increase the purchase cost of the equipment. At the same time, the isolation film needs to be peeled off when the coating film is used, which increases the process steps and reduces the production efficiency. At the same time, the separation film costs increase the production cost. If the structural stability of the point is improved, it will be helpful to simplify the production equipment, reduce the production cost, and simplify the production process.

[0056] 3. For special customers, such as some large lithium battery manufacturers, linear coating is accustomed to using multi-layer measurement to characterize film thickness data, which solves the measurement and characterization problems and is more conducive to promotion. At the same time, linear coating can greatly increase the service life of the plate roller, reduce production costs, and add more options for coating styles.

[0057] Please refer to 10-11 in detail. The second aspect of the present invention discloses a coating system, including a plate roller, on which a plurality of transfer convex points corresponding to the above-mentioned coating convex point arrangement are arranged.

[0058] In the second aspect of the present invention, as a preferred embodiment, please refer to 10 in detail, corresponding to the dotted line array in a ring shape, the transfer convex points on the plate roller include an upper connecting part 31 and a lower connecting part 32, the cross-section of the lower connecting part is conical, and the upper end of the lower connecting part is connected to the lower part of the upper connecting part. The width of the dotted line is generally 50-300um, and the coverage rate is generally: 5%-50%. Enlarged image of the dotted line plate roller convex points: Enlarged image of the dotted line plate roller annular convex points: The surface of the circular plate roller is covered with many annular lines similar to the picture. The annular lines are generally larger at the bottom than the top to form a cone. The cone shape is conducive to structural stability and longer service life. The arrangement of the annular lines on the plate roller can be a rectangular arrangement or a diamond arrangement. After the plate roller contacts the micro-concave roller with slurry, the top of the ring line on the plate roller is covered with slurry, and then the plate roller contacts the diaphragm and transfers to the diaphragm to form a coating of the corresponding shape. The plate roller, micro-concave roller and diaphragm are required to have the same speed and direction of movement, and the speed difference between the three is controlled within 5%. The coating height can be adjusted by changing the solid content, viscosity and distance between the plate roller and the diaphragm of the slurry. The coating environment can be at room temperature, and the slurry viscosity is: 100mPa·s-15000mPa·s. The solid content of the slurry is: 1%-50%. The production speed is generally: 3-300m / min.

[0059] In the second aspect of the present invention, as a preferred embodiment, please refer to 11 specifically, the transfer convex points on the plate roller are triangular, and the transfer convex points include a dot coating part 41 located on the upper side and a base 42 located at the lower part of the dot coating part. The dot coating part is an equilateral triangle, and the base is conical and the upper part of the base is connected with the lower part of the dot coating part. The area of ​​the triangle at the top of the dot coating part is generally 2*10-9㎡ to 800*10-9㎡, and the coverage rate is generally 5%-50%. The surface of the circular plate roller is covered with many triangular convex points similar to the picture. The triangular convex points are generally larger at the bottom than at the top and are conical. The conical shape is conducive to structural stability and longer service life. The arrangement of the triangular convex points on the plate roller can be a rectangular arrangement or a diamond arrangement. The plate roller contacts with the micro-concave roller, so that the convex points on the plate roller carry the slurry, and then the plate roller contacts with the diaphragm and transfers it to the diaphragm to form a coating point of the corresponding shape. The plate roller, micro-concave roller and diaphragm are required to have the same speed and direction of movement, and the speed difference between the three is controlled within 5%. The height of the coating point can be adjusted by changing the solid content, viscosity and distance between the plate roller and the diaphragm of the slurry. The coating environment can be at room temperature, and the viscosity of the slurry is: 100mPa·s-15000mPa·s. The solid content of the slurry is: 1%-50%. The production speed is generally: 3-300m / min.

[0060] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A coating bump arrangement, It is characterized in that The invention comprises an isolation film, on which a plurality of coating convex points are coated, and the coating convex points are in irregular convex point shape or line shape.

2. The coating bump arrangement as claimed in claim 1, Features: The coating convex dots are in the shape of one or more of a triangle, a quadrilateral, a polygon, and a plum blossom.

3. The coating bump arrangement as claimed in claim 2, Features: The plurality of coating protrusions are arranged in a dotted line shape to form a plurality of dotted line arrays.

4. The coating bump arrangement as claimed in claim 3, Features: The dotted line formation is in a straight line shape.

5. The coating bump arrangement as claimed in claim 4, Features: Among the plurality of dotted line formations, at least two dotted line formations are parallel to each other.

6. The coating bump arrangement as claimed in claim 4, Features: Among the plurality of dotted line formations, at least two dotted line formations are crossed together.

7. The coating bump arrangement as claimed in claim 3, Features: The dotted line formation is ring-shaped.

8. The coating bump arrangement as claimed in claim 2, Features: The plurality of coating protrusions are arranged in a solid line shape to form a plurality of solid line arrays.

9. The coating bump arrangement as claimed in claim 8, Features: The solid line formation is in a straight line shape.

10. The coating bump arrangement according to claim 9, Features: Among the plurality of solid line formations, at least two solid line formations are parallel to each other.

11. The coating bump arrangement according to claim 10, Features: Among the plurality of solid line formations, at least two solid line formations are crossed together.

12. The coating bump arrangement according to claim 8, Features: The solid line formation is ring-shaped.

13. A coating system, It is characterized in that It comprises a plate roller, on which a plurality of transfer convex dots arranged in the coating convex dot arrangement according to any one of claims 1 to 12 are correspondingly arranged.

14. The coating bump arrangement as claimed in claim 13, Features: Corresponding to the annular dotted line array, the transfer convex point on the plate roller includes an upper connecting part and a lower connecting part, the cross section of the lower connecting part is conical, and the upper end of the lower connecting part is connected with the lower part of the upper connecting part.

15. The coating bump arrangement according to claim 13, Features: The transfer convex point on the plate roller is triangular, and the transfer convex point includes a dot coating part with the dot located on the upper side and a base located below the dot coating part. The dot coating part is an equilateral triangle, and the base is conical, and the upper part of the base is connected with the lower part of the dot coating part.

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