A coating roll and a coating apparatus

Abstract

The application discloses a coating roller and a coating device, and relates to the technical field of coating. The coating roller comprises a roller body, a plurality of first convex parts are arranged on the circumferential side of the roller body, the plurality of first convex parts are arranged in an array, and the height H1 of the first convex part is set as 100 microns <= H1 <= 800 microns. The coating roller provided by the application can improve the uniform consistency of the coating paste.

Description

Technical Field

[0001] This application relates to the field of coating technology, and more particularly to a coating roller and coating equipment. Background Technology

[0002] Currently, the most commonly used industrial methods for coating lithium battery separators include rotary spraying. In rotary spraying, the slurry is fed into a distribution plate through a nozzle. The distribution plate pre-distributes and diffuses the slurry onto the upper and lower plates, and a certain rotation speed is matched to atomize the slurry onto the separator.

[0003] However, the convex diaphragm coated by rotary spraying has problems such as uneven spraying point size and height, resulting in poor coating consistency. Utility Model Content

[0004] This application provides a coating roller and coating equipment to improve the uniformity of the coating slurry.

[0005] This application provides a coating roller, including a roller body, wherein a plurality of first protrusions are provided on the periphery of the roller body, the plurality of first protrusions are arranged in an array, and the height H1 of the first protrusions is set to 100μm≤H1≤800μm.

[0006] In some possible implementations, the first protrusion includes an outer peripheral wall, and the included angle α between the outer peripheral wall and the roller body is set to 40°≤α≤70°.

[0007] In some possible implementations, the first protrusion includes a through hole communicating with the roller body and at least one annular structure disposed around the periphery of the through hole with the same center.

[0008] In some possible implementations, the minimum wall thickness m of the annular structure is set to 25 μm ≤ m ≤ 325 μm; And / or, the outer radius R of the annular structure is set to 100μm≤R≤500μm; And / or, the inner radius r of the annular structure is set to 25μm≤r≤375μm; And / or, the outer radius R of the ring structure and the inner radius r of the ring structure satisfy 0.25R≤r≤0.75R.

[0009] In some possible implementations, the first protrusion includes a plurality of the annular structures, which are arranged sequentially and spaced apart around the periphery of the through hole with the same center. In the same first protrusion, in any two adjacent annular structures, the height of the annular structure farther from the through hole is greater than the height of the annular structure closer to the through hole.

[0010] In some possible implementations, the height difference ΔH between any two adjacent annular structures in the same first protrusion is set to 1μm≤ΔH≤8μm.

[0011] In some possible implementations, the side of the annular structure facing away from the roller body is configured as an inclined surface; The inclined surface gradually slopes away from the roller body from the side closer to the through hole to the side farther away from the through hole.

[0012] In some possible implementations, the inclined surface includes a first side and a second side, the second side being disposed close to the through hole; The height difference Δh between the first side and the second side is set to 0.5μm≤Δh≤2μm.

[0013] In some possible implementations, a plurality of second protrusions are disposed on the side of the first protrusion facing away from the roller body; The height H2 of the second protrusion is set to 1μm≤H2≤8μm; and / or, the projected area S1 of all the second protrusions on the same first protrusion on the unfolded plane of the roller body surface and the projected area S2 of the first protrusion on the unfolded plane of the roller body surface satisfy 15%S2≤S1≤40%S2.

[0014] In addition, this application also provides a coating device, including a material box, a feeding roller, a transfer roller, a support roller, and the coating roller provided in the above embodiments. The feeding roller is rotatably mounted in the material box, and the transfer roller is disposed on one side of the material box and in contact with the feeding roller. The coating roller is rotatably disposed on the side of the transfer roller opposite to the feeding roller and in contact with the transfer roller. The support roller is disposed on the side of the coating roller opposite to the feeding roller. A gap is provided between the coating roller and the support roller to allow the film to pass through.

[0015] The beneficial effects of this application are as follows: In the coating roller provided by this application, a plurality of first protrusions are raised on the roller body surface and arranged in an array, thereby enabling the slurry to be uniformly coated on the film surface, thus ensuring the uniformity of the slurry coated on each part of the film. In addition, the height of the first protrusions is set to 100μm to 800μm, which can reduce the problem of slurry adhering to each first protrusion and thus ensure the consistency of the shape of the slurry coated on the film, further improving the effect of slurry coating on the film. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 Schematic diagrams of the coating apparatus in some embodiments are shown; Figure 2 Schematic diagrams of the coating rollers in some embodiments are shown; Figure 3 Schematic diagrams of the coating roller unfolded are shown in some embodiments; Figure 4 A schematic diagram of the structure of the first protrusion is shown in some embodiments; Figure 5 A structural schematic diagram of the first protrusion is shown in some other embodiments; Figure 6 A structural schematic diagram of the first protrusion is shown in some other embodiments; Figure 7 A schematic diagram of the structure of the first protrusion is shown in some embodiments; Figure 8 A cross-sectional structural schematic diagram of the first protrusion is shown in some embodiments; Figure 9 A cross-sectional structural schematic diagram of the first protrusion is shown in some other embodiments; Figure 10 A cross-sectional structural schematic diagram of the first and second protrusions in some embodiments is shown; Figure 11 Dimensional diagrams of the first and second protrusions are shown in some other embodiments.

[0018] Explanation of key component symbols: 100-Coating roller; 110-Roller body; 120-First protrusion; 121-Outer peripheral wall; 122-Inclined surface; 1221-First side; 1222-Second side; 123-Through hole; 124-Annular structure; 130-Second protrusion; 200-material box; 310 - Feeding roller; 320 - Transfer roller; 330 - Support roller; 340 - Discharge roller; 350 - Scraper. Detailed Implementation

[0019] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0020] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0021] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0022] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0023] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0024] like Figure 1As shown, the embodiment provides a coating apparatus for coating a slurry onto a thin film. The thin film may be a separator used in batteries.

[0025] In some embodiments, the coating apparatus may include a hopper 200, a feeding roller 310, a coating roller 100, a transfer roller 320, and a support roller 330. The feeding roller 310 is rotatably disposed in the hopper 200 and is used to obtain slurry from the hopper 200. The transfer roller 320 is rotatably disposed on one side of the feeding roller 310 and contacts the feeding roller 310. The coating roller 100 may be disposed on the side of the transfer roller 320 opposite to the feeding roller 310 and contacts the transfer roller 320. During operation, the transfer roller 320 can transport the slurry on the feeding roller 310 to the coating roller 100. In this embodiment, the support roller 330 may be disposed on the side of the coating roller 100 opposite to the transfer roller 320, and a gap may be provided between the support roller 330 and the coating roller 100 for the film to pass through. When the film passes through the gap between the support roller 330 and the coating roller 100, the coating roller 100 can apply a certain pressure to the film and coat the slurry onto the film, while the support roller 330 can provide support for the film.

[0026] In some embodiments, a doctor blade 350 is also provided on one side of the transfer roller 320 to ensure that the slurry on the transfer roller 320 is evenly coated onto the coating roller 100. Additionally, the coating equipment includes a feed roller 340, which can be used to carry the roll of slurry film to be coated, thereby feeding the film.

[0027] like Figures 2 to 4As shown, in some embodiments, the coating roller 100 may include a roller body 110. A plurality of first protrusions 120 are protruding from the periphery of the roller body 110. The plurality of first protrusions 120 may be arrayed on the surface of the roller body 110 and cover the entire surface of the roller body 110. In some embodiments, the height H1 of the first protrusions 120 may be set to 100μm≤H1≤800μm. On the one hand, this avoids the problem of slurry sticking to adjacent first protrusions 120 when the height of the first protrusions 120 is too low, thereby reducing the probability of slurry sticking to the coating roller 100. On the other hand, it avoids insufficient support at the end of the first protrusions 120 away from the roller body 110 when the height of the first protrusions 120 is too high, reducing the risk of breakage of the first protrusions 120. Preferably, based on the ease of engraving, durability, and coating versatility of the coating roller 100, the height H1 of the first protrusions 120 may be set to 200μm≤H1≤600μm. For example, in some embodiments, the height H1 of the first protrusion 120 may be set to 100μm, 150μm, 200μm, 220μm, 250μm, 280μm, 300μm, 370μm, 400μm, 450μm, 480μm, 500μm, 550μm, 580μm, 600μm, 640μm, 680μm, 700μm, 750μm, 800μm or any other height from 100μm to 800μm.

[0028] In this embodiment, the roller body 110 has a plurality of first protrusions 120 arranged in an array on its surface, thereby enabling the slurry to be uniformly coated on the film surface, ensuring the uniformity of the slurry coating on each part of the film. Furthermore, the height of the first protrusions 120 is set to 100μm to 800μm, which reduces the problem of slurry adhesion on each of the first protrusions 120, thereby ensuring the consistency of the shape of the slurry coated on the film and further improving the effect of the slurry coating on the film.

[0029] like Figure 2 and Figure 5As shown, in some embodiments, the outer peripheral wall 121 of the first protrusion 120 can be inclined, and the included angle α between the outer peripheral wall 121 of the first protrusion 120 and the surface of the roller body 110 can be set to 40°≤α≤70°. Preferably, the included angle α between the outer peripheral wall 121 of the first protrusion 120 and the surface of the roller body 110 can be set to 45°≤α≤60°. On the one hand, this avoids the first protrusion 120 needing to occupy a large area due to an excessively small included angle α between the outer peripheral wall 121 of the first protrusion 120 and the surface of the roller body 110, thereby expanding the application scenarios of the coating roller 100 and making it suitable for high-coverage coatings, thus increasing its versatility. On the other hand, this avoids the first protrusion 120 having poor stability due to an excessively large included angle α between the outer peripheral wall 121 of the first protrusion 120 and the surface of the roller body 110, reducing the risk of breakage of the first protrusion 120 and extending the service life of the coating roller 100. At the same time, it can better control the size and shape of the slurry applied to the film by the coating roller 100, reduce the deviation between each coating point, and improve the uniformity of the slurry coating.

[0030] For example, in some embodiments, the included angle α between the outer peripheral wall 121 of the first protrusion 120 and the surface of the roller body 110 can be set to 40°, 42°, 45°, 48°, 50°, 55°, 60°, 62°, 65°, 68°, 70° or any other angle between 40° and 70°.

[0031] like Figures 6 to 9 As shown, in some embodiments, the first protrusion 120 is provided with a through hole 123 communicating with the roller body 110, and at least one annular structure 124 disposed around the through hole 123 with the same center. It is understood that the through hole 123 can connect the side of the first protrusion 120 opposite to the roller body 110 and the side facing the roller body 110, allowing the portion of the roller body 110 opposite to the through hole 123 to be exposed. That is, the interior of the first protrusion 120 is a hollow structure. This reduces the probability of paste adhering to the center of the first protrusion 120, allowing for the application of annular coating dots on the film.

[0032] like Figure 6 As shown, in some embodiments, the first protrusion 120 may include an annular structure 124, which may surround the periphery of the through hole 123.

[0033] In some embodiments, the minimum wall thickness m of the annular structure 124 can be set to 25μm ≤ m ≤ 325μm. It is understood that when the outer wall surface of the annular structure 124 is inclined, the minimum wall thickness m of the annular structure 124 can refer to the wall thickness of the end of the annular structure 124 away from the roller body 110. This reduces the probability of material being carried along the through-hole 123 of the first protrusion 120, ensuring the consistency of the coating dot shape. Exemplarily, the minimum wall thickness m of the annular structure 124 can be set to 25μm, 50μm, 100μm, 120μm, 150μm, 220μm, 250μm, 280μm, 300μm, 310μm, 325μm, or any other thickness from 25μm to 325μm.

[0034] like Figure 7 As shown, in some embodiments, the outer diameter R of the annular structure 124 can be set to 100μm ≤ R ≤ 500μm. The inner diameter r of the annular structure 124 can be set to 25μm ≤ r ≤ 375μm. Furthermore, the outer radius R and the inner radius r of the annular structure 124 can satisfy 0.25R ≤ r ≤ 0.75R. This improves the adhesion performance between the diaphragm and the electrode, as well as the air permeability.

[0035] Exemplary, in some embodiments, the outer diameter R of the annular structure 124 may be set to 100 μm, 120 μm, 150 μm, 200 μm, 250 μm, 280 μm, 320 μm, 350 μm, 400 μm, 460 μm, 500 μm, or any other size from 100 μm to 500 μm. The inner diameter r of the annular structure 124 may be set to 25 μm, 50 μm, 90 μm, 120 μm, 150 μm, 180 μm, 220 μm, 250 μm, 290 μm, 300 μm, 340 μm, 360 μm, 375 μm, or any other size from 25 μm to 375 μm.

[0036] Because the coating slurry has a certain surface tension, it is not easy to spread on the first protrusion 120. To enable the first protrusion 120 to better carry the slurry, in some embodiments, the end face of the annular structure 124 facing away from the roller body 110 can be configured as a slope 122. The slope 122 can gradually slope away from the roller body 110 from the end near the through hole 123 to the end away from the through hole 123. Thus, the end face of the first protrusion 120 facing away from the roller body 110 can better adhere to and carry the slurry, improving the uniformity of the coating.

[0037] In some embodiments, the inclined surface 122 may include a first side 1221 and a second side 1222, wherein the second side 1222 may be disposed near the through hole 123, that is, the first side 1221 may refer to the outer side of the inclined surface 122, and the second side 1222 may refer to the inner side of the inclined surface 122. In the embodiment, the height difference Δh between the first side 1221 and the second side 1222 is set to 0.5μm≤Δh≤2μm, which can further enable the slurry to better adhere and spread on the first protrusion 120 and not easily slip onto the surface of the roller body 110, thereby improving the uniformity of the slurry coating.

[0038] For example, in some embodiments, the height difference Δh between the first side 1221 and the second side 1222 is set to any other difference among 0.5μm, 0.65μm, 0.8μm, 1.0μm, 1.2μm, 1.55μm, 1.8μm, 2.0μm or 0.5μm to 2μm.

[0039] like Figure 8 and Figure 9 As shown, in some embodiments, the first protrusion 120 may include a plurality of annular structures 124, which may be sequentially arranged around the periphery of the through hole 123 with the same center and spaced apart from each other. Exemplarily, the first protrusion 120 may include two, three, or four equal numbers of annular structures 124.

[0040] In some embodiments, within the same first protrusion 120, in any two adjacent annular structures 124, the height of the annular structure 124 farther from the through hole 123 is higher than the height of the annular structure 124 closer to the through hole 123. Furthermore, the height difference ΔH between two adjacent annular structures 124 within the same first protrusion 120 is set to 1 μm ≤ ΔH ≤ 8 μm. This ensures the uniformity of the coating dots on the film.

[0041] For example, in some embodiments, the height difference ΔH between two adjacent annular structures 124 in the same first protrusion 120 is set to 1μm, 1.5μm, 2.2μm, 2.5μm, 3μm, 3.5μm, 4μm, 4.6μm, 5μm, 6.5μm, 7.2μm, 7.8μm, 8μm or any other height difference from 1μm to 8μm.

[0042] like Figure 10 and Figure 11As shown, in some embodiments, a plurality of second protrusions 130 are further provided on the surface of the first protrusion 120 facing away from the roller body 110. The height H2 of the second protrusions 130 can be set to 1μm≤H2≤8μm. Preferably, in order to balance the service life of the coating roller 100 and the slurry extensibility, the height H2 of the second protrusions 130 can be set to 3μm≤H2≤6μm. Thus, the slurry can be easily adhered to the first protrusion 120, facilitating slurry wetting.

[0043] For example, in some embodiments, the height H2 of the second protrusion 130 can be set to any other height from 1μm, 1.5μm, 2μm, 3μm, 5μm, 6μm, 6.5μm, 7μm, 8μm, 1μm to 8μm.

[0044] In some embodiments, the projected area S1 of all the second protrusions 130 on the same first protrusion 120 on the unfolded plane of the roller body 110 satisfies the condition that 15%S2≤S1≤40%S2. Preferably, the projected area S1 of all the second protrusions 130 on the same first protrusion 120 on the unfolded plane of the roller body 110 satisfies the condition that 20%S2≤S1≤30%S2. This ensures the overall structural strength of the coating roller 100 and reduces the risk of deformation, wear, and breakage of the second protrusions 130.

[0045] For example, the projected area S1 of all the second protrusions 130 on the same first protrusion 120 on the unfolded plane of the roller body 110 is any other percentage of 15%, 20%, 25%, 30%, 35%, 40% or 15% to 40% of the projected area S2 of the first protrusion 120 on the unfolded plane of the roller body 110.

[0046] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0047] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A coating roller, characterized in that, The roller body has a plurality of first protrusions protruding from its circumference. The plurality of first protrusions are arranged in an array. The height H1 of the first protrusions is set to 100μm≤H1≤800μm.

2. The coating roller according to claim 1, characterized in that, The first protrusion includes an outer peripheral wall, and the included angle α between the outer peripheral wall and the roller body is set to 40°≤α≤70°.

3. The coating roller according to claim 1, characterized in that, The first protrusion includes a through hole communicating with the roller body and at least one annular structure disposed around the periphery of the through hole with the same center.

4. The coating roller according to claim 3, characterized in that, The minimum wall thickness m of the annular structure is set to be 25μm≤m≤325μm; And / or, the outer radius R of the annular structure is set to 100μm≤R≤500μm; And / or, the inner radius r of the annular structure is set to 25μm≤r≤375μm; And / or, the outer radius R of the ring structure and the inner radius r of the ring structure satisfy 0.25R≤r≤0.75R.

5. The coating roller according to claim 3, characterized in that, The first protrusion includes a plurality of the aforementioned annular structures, which are arranged sequentially and at intervals around the periphery of the through hole with the same center. In the same first protrusion, in any two adjacent annular structures, the height of the annular structure farther from the through hole is greater than the height of the annular structure closer to the through hole.

6. The coating roller according to claim 5, characterized in that, In the same first protrusion, the height difference ΔH between any two adjacent annular structures is set to 1μm≤ΔH≤8μm.

7. The coating roller according to claim 3, characterized in that, The side of the annular structure opposite to the roller body is configured as an inclined surface; The inclined surface gradually slopes away from the roller body from the side closer to the through hole to the side farther away from the through hole.

8. The coating roller according to claim 7, characterized in that, The inclined surface includes a first side and a second side, with the second side disposed close to the through hole; The height difference Δh between the first side and the second side is set to 0.5μm≤Δh≤2μm.

9. The coating roller according to any one of claims 1 to 8, characterized in that, A plurality of second protrusions are provided on the side of the first protrusion facing away from the roller body; The height H2 of the second protrusion is set to 1μm≤H2≤8μm; and / or, the projected area S1 of all the second protrusions on the same first protrusion on the unfolded plane of the roller body surface and the projected area S2 of the first protrusion on the unfolded plane of the roller body surface satisfy 15%S2≤S1≤40%S2.

10. A coating apparatus, characterized in that, The device includes a material box, a feeding roller, a transfer roller, a support roller, and a coating roller as described in any one of claims 1 to 9, wherein the feeding roller is rotatably mounted in the material box, and the transfer roller is disposed on one side of the material box and in contact with the feeding roller; The coating roller is rotatably disposed on the side of the transfer roller opposite to the feeding roller and in contact with the transfer roller. The support roller is disposed on the side of the coating roller opposite to the feeding roller. A gap is provided between the coating roller and the support roller to allow the film to pass through.

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