Coating roll assembly and coating apparatus

Abstract

This application relates to a coating roller assembly and coating equipment. The coating roller assembly includes: a support, a fixed roller, a first tension roller, and a second tension roller; the fixed roller is fixedly mounted on the support, and the first tension roller and the second tension roller are rotatably mounted on the support, with the first tension roller located on one side of the fixed roller and the second tension roller located on the other side of the fixed roller. During substrate transport, the substrate is respectively attached to the fixed roller, the first tension roller, and the second tension roller. The solution provided by this application can improve the consistency of coating thickness.

Description

Technical Field

[0001] This application relates to the field of lithium battery manufacturing technology, and in particular to a coating roller assembly and coating equipment. Background Technology

[0002] As a key piece of equipment in the lithium battery manufacturing process, the coating machine's coating thickness accuracy affects the quality and safety of lithium batteries. Figure 1 This is a cross-sectional schematic diagram of a coating apparatus shown in related technologies. For example... Figure 1 As shown, in related technologies, when coating lithium battery electrodes, the substrate such as foil released from the unwinding roll enters the coating equipment through the inlet. Then, the substrate passes through multiple rollers to flatten and remove wrinkles before reaching the coating main roller. During coating, the coating main roller rotates synchronously with the substrate and supports the substrate, making the substrate surface smooth during coating. At the same time, the coating die head uniformly extrudes slurry onto the substrate located on the coating main roller for coating. The distance between the roller surface of the coating main roller and the liquid outlet of the coating die head determines the thickness of the coating film.

[0003] However, in the related technologies, the coating main roller has a circular runout tolerance during the coating process, which directly affects the consistency of the coating thickness. Utility Model Content

[0004] To address or partially address the problems existing in the related technologies, this application provides a coating roller assembly and coating equipment that can improve the consistency of coating thickness.

[0005] The first aspect of this application provides a coating roller assembly, including: a bracket, a fixed roller, a first tension roller, and a second tension roller;

[0006] The fixed roller is fixedly mounted on the bracket, and the first tension roller and the second tension roller are rotatably mounted on the bracket. The first tension roller is located on one side of the fixed roller, and the second tension roller is located on the other side of the fixed roller. During substrate transport, the substrate is respectively attached to the fixed roller, the first tension roller, and the second tension roller.

[0007] Furthermore, the outer circumferential surface of the fixed roller is provided with a wear-resistant layer for attaching the substrate, or the fixed roller is made of a wear-resistant material.

[0008] Furthermore, the wear-resistant layer is made of ceramic, polyethylene, polyetheretherketone, or nylon material, or the wear-resistant material is ceramic, polyethylene, polyetheretherketone, or nylon.

[0009] Furthermore, the straightness of the fixed roller is ≤0.2µm.

[0010] Furthermore, the coefficient of sliding friction between the fixed roller and the substrate is 0.32-0.77.

[0011] Furthermore, the support includes a first upright plate and a second upright plate, which are arranged opposite to each other, and the fixed roller, the first tension roller and the second tension roller are all located between the first upright plate and the second upright plate.

[0012] Furthermore, the support also includes a crossbeam, and the first upright plate and the second upright plate are respectively connected to the crossbeam.

[0013] Furthermore, the coating roller assembly also includes a drive unit connected to the bracket, the drive unit being used to drive the bracket to rotate.

[0014] Furthermore, the fixed rollers are multiple, and the multiple fixed rollers are circumferentially spaced.

[0015] A second aspect of this application provides a coating apparatus, comprising: a base, a coating die, and a coating roller assembly as described in any of the preceding claims, wherein the coating die and the coating roller assembly are both disposed on the base, and a fixed roller is disposed opposite to the coating die, wherein the coating die is used to coat the surface of the substrate as the substrate passes through the fixed roller.

[0016] The technical solution provided in this application may include the following beneficial results: by fixing the fixed roller to the support, the first tension roller and the second tension roller are rotatably mounted on the support. When the substrate is transported, it is respectively attached to the fixed roller, the first tension roller and the second tension roller. The first tension roller and the second tension roller can limit the wrap angle of the substrate on the fixed roller. When the substrate moves, it can slide relative to the fixed roller. The coating die head coats the substrate that has passed through the fixed roller. The fixed roller does not rotate with the movement of the substrate during coating. Therefore, compared with the method of the coating main roller rotating synchronously with the substrate in the related technology, the fixed roller of this application does not have circular runout tolerance, thereby improving the consistency of coating thickness and coating accuracy.

[0017] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0018] The above and other objects, features and advantages of this application will become more apparent from the more detailed description of exemplary embodiments thereof in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments thereof.

[0019] Figure 1 This is a cross-sectional schematic diagram of a coating apparatus shown in related technologies;

[0020] Figure 2 This is a cross-sectional schematic diagram of the coating equipment shown in the embodiments of this application;

[0021] Figure 3 yes Figure 2 A magnified view of a section at point A in the middle;

[0022] Figure 4 This is a schematic diagram of the structure of the coating roller assembly shown in the embodiments of this application.

[0023] Figure label:

[0024] 1-Substrate, 2-Passing roller, 3-Coating main roller, 4-Coating die head, 5-Coating roller assembly, 51-Bracket, 511-First vertical plate, 512-Second vertical plate, 513-Crossbeam, 52-Fixed roller, 53-First tension roller, 54-Second tension roller, 55-Driver, 6-Base. Detailed Implementation

[0025] Embodiments of this application will now be described in more detail with reference to the accompanying drawings. While embodiments of this application are shown in the drawings, it should be understood that this application may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to make this application more thorough and complete, and to fully convey the scope of this application to those skilled in the art.

[0026] It should be understood that although the terms "first," "second," "third," etc., may be used in this application to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this application, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. 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.

[0027] In the description of this application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and 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.

[0028] 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.

[0029] Figure 1 This is a cross-sectional schematic diagram of a coating apparatus shown in related technologies. For example... Figure 1 As shown, in related technologies, when coating lithium battery electrodes, the substrate 1, such as foil, released from the unwinding roll enters the coating equipment through the inlet. Then, the substrate 1 is flattened and wrinkled by multiple rollers 2 before reaching the coating main roller 3. During coating, the coating main roller 3 rotates synchronously with the substrate 1 and supports the substrate 1, making the surface of the substrate 1 flat during coating. At the same time, the coating die 4 evenly extrudes slurry onto the substrate 1 located on the coating main roller 3 for coating. The distance between the roller surface of the coating main roller 3 and the liquid outlet of the coating die 4 determines the thickness of the coating film.

[0030] However, in the related technology, the coating main roller 3 has a circular runout tolerance during the coating process, which directly affects the consistency of the coating thickness.

[0031] To address the aforementioned issues, this application provides a coating roller assembly and coating equipment that can improve the consistency of coating thickness.

[0032] The technical solutions of the embodiments of this application are described in detail below with reference to the accompanying drawings.

[0033] Figure 2 This is a cross-sectional schematic diagram of the coating equipment shown in the embodiments of this application; Figure 3 yes Figure 2 A magnified view of a section at point A in the middle; Figure 4 This is a schematic diagram of the structure of the coating roller assembly 5 shown in the embodiments of this application.

[0034] like Figures 2 to 4 As shown in the figure, this application provides a coating device, including a base 6, a coating die 4, and a coating roller assembly 5, both of which are disposed on the base 6. The coating roller assembly 5 includes a support 51, a fixed roller 52, a first tension roller 53, and a second tension roller 54.

[0035] The fixed roller 52 is fixedly mounted on the bracket 51. The first tension roller 53 and the second tension roller 54 are rotatably mounted on the bracket 51. The first tension roller 53 is located on one side of the fixed roller 52, and the second tension roller 54 is located on the other side of the fixed roller 52. When the substrate 1 is transported, it is attached to the fixed roller 52, the first tension roller 53 and the second tension roller 54 respectively.

[0036] The fixed roller 52 is arranged opposite to the coating die 4, and the coating die 4 is used to coat the surface of the substrate 1 when the substrate 1 passes through the fixed roller 52.

[0037] The substrate 1 released from the feed roll enters the coating equipment through the inlet. Then, the substrate 1 is flattened and wrinkled by multiple rollers 2 and reaches the coating roller assembly 5. It then passes through the second tension roller 54, the fixed roller 52 and the first tension roller 53 in sequence. During coating, the first tension roller 53 and the second tension roller 54 rotate synchronously with the substrate 1, while the fixed roller 52 remains stationary. The substrate 1 slides relative to the fixed roller 52. At the same time, the coating die head 4 evenly extrudes slurry onto the substrate 1 located on the fixed roller 52 for coating.

[0038] By fixing the fixed roller 52 to the bracket 51, the first tension roller 53 and the second tension roller 54 can be rotatably mounted on the bracket 51. When the substrate 1 is transported, it is attached to the fixed roller 52, the first tension roller 53 and the second tension roller 54 respectively. The first tension roller 53 and the second tension roller 54 can limit the size of the wrap angle of the substrate 1 on the fixed roller 52. By setting the positions of the first tension roller 53 and the second tension roller 54, the substrate 1 can have a larger wrap angle on the fixed roller 52, thereby reducing the friction between the substrate 1 and the fixed roller 52.

[0039] When the substrate 1 moves, it can slide relative to the fixed roller 52. The coating die 4 coats the substrate 1 that has passed through the fixed roller 52. The fixed roller 52 does not rotate with the movement of the substrate 1 during coating. The coating die 4 and the fixed roller 52 are relatively stationary. Therefore, compared with the method of the coating main roller 3 rotating synchronously with the substrate 1 in the related technology, the fixed roller 52 of this application does not have a circular runout tolerance, thereby improving the consistency of coating thickness and coating accuracy. At the same time, the fixed roller 52 does not need to rotate, so it is easier to adjust.

[0040] In some embodiments, the outer peripheral surface of the fixed roller 52 is provided with a wear-resistant layer for attaching the substrate 1, or the fixed roller 52 is made of a wear-resistant material. Specifically, when the outer peripheral surface of the fixed roller 52 is provided with a wear-resistant layer, other parts of the fixed roller 52 may be made of materials such as metal, and the wear-resistant layer is in contact with the substrate 1 and has wear resistance. When the fixed roller 52 is made of a wear-resistant material, the fixed roller 52 may be a one-piece molded structure.

[0041] In some embodiments, the wear-resistant layer is made of ceramic, polyethylene, polyetheretherketone, or nylon, or the wear-resistant material is ceramic, polyethylene, polyetheretherketone, or nylon. Specifically, when the wear-resistant layer is made of ceramic material or the fixed roller 52 is made entirely of ceramic material, composite ceramic material can be used. The surface of the wear-resistant layer or the fixed roller 52 is laser-processed to form an ultra-smooth surface, which has wear resistance and smoothness, and a low coefficient of friction.

[0042] In some embodiments, the fracture toughness of the composite ceramic material is 3-4 MPa·m1 / 2; it has a long service life and maintenance cycle, with the substrate running at a speed of 100 m / min for 1 million meters, the ceramic wear is 0.68 μm, and the copper foil transfer is 0.54 mg.

[0043] In some embodiments, the straightness of the fixed roller 52 is ≤0.2µm. Specifically, the coating accuracy of a traditional rotary main roller is 1.5~2µm, while the coating accuracy using the fixed roller 52 is ≤0.2µm, i.e., the straightness of the fixed roller 52. At the same time, the adjustment difficulty of the fixed roller 52 is reduced.

[0044] In some embodiments, the coefficient of sliding friction between the fixed roller 52 and the substrate 1 is 0.32-0.77, which reduces the friction between the substrate 1 and the fixed roller 52 and extends the service life of the fixed roller 52.

[0045] In some embodiments, such as Figure 4 As shown, the support 51 includes a first upright plate 511 and a second upright plate 512, which are arranged opposite to each other. A fixed roller 52, a first tension roller 53, and a second tension roller 54 are all located between the first upright plate 511 and the second upright plate 512. The first upright plate 511 and the second upright plate 512 form the fixed roller 52, the first tension roller 53, and the second tension roller 54. The two ends of the fixed roller 52 are fixedly connected to the first upright plate 511 and the second upright plate 512, respectively. The two ends of the first tension roller 53 are rotatably connected to the first upright plate 511 and the second upright plate 512, respectively. The two ends of the second tension roller 54 are rotatably connected to the first upright plate 511 and the second upright plate 512, respectively.

[0046] In some embodiments, such as Figure 3 As shown, the support 51 also includes a crossbeam 513, and the first upright plate 511 and the second upright plate 512 are respectively connected to the crossbeam 513. The crossbeam 513 connects the first upright plate 511 and the second upright plate 512, thereby improving the strength of the connection between the first upright plate 511 and the second upright plate 512.

[0047] In some embodiments, such as Figure 4 As shown, the coating roller assembly 5 also includes a drive component 55, which is connected to the bracket 51 and is used to drive the bracket 51 to rotate. The drive component 55 can be a motor. The bracket 51 is rotatably connected to the base 6. The drive component 55 is used to drive the bracket 51 to rotate relative to the base 6, thereby facilitating the adjustment of the positions of the fixed roller 52, the first tension roller 53, and the second tension roller 54, and ensuring that the gap between the fixed roller 52 and the coating die head 4 is within the set value.

[0048] In some embodiments, such as Figure 3 and Figure 4As shown, there are multiple fixed rollers 52, which are circumferentially spaced. Specifically, when it is necessary to replace a fixed roller 52 for coating, the drive component 55 drives the bracket 51 to rotate, so that the fixed roller 52 to be used is rotated to the position directly opposite the coating die head 4. This facilitates the replacement of the fixed roller 52 and can be done without stopping the machine, thus improving production efficiency. Each fixed roller 52 has a first tension roller 53 and a second tension roller 54 on both sides. The illustration shows two fixed rollers 52. When one fixed roller 52 becomes worn and cannot meet production requirements, the drive component 55 drives the bracket 51 to rotate 180°, placing the other fixed roller 52 in the opposite coating position of the coating die head 4, allowing the coating operation to continue.

[0049] The solution of this application has been described in detail above with reference to the accompanying drawings. In the above embodiments, the descriptions of each embodiment have different focuses; for parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments. Those skilled in the art should also understand that the actions and modules involved in the specification are not necessarily essential to this application. Furthermore, it is understood that the steps in the method of this application embodiment can be adjusted, combined, and deleted according to actual needs, and the modules in the device of this application embodiment can be combined, divided, and deleted according to actual needs.

[0050] The various embodiments of this application have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A coating roll assembly characterized by, include: Support, fixed roller, first tension roller and second tension roller; The fixed roller is fixedly mounted on the bracket, and the first tension roller and the second tension roller are rotatably mounted on the bracket. The first tension roller is located on one side of the fixed roller, and the second tension roller is located on the other side of the fixed roller. During substrate transport, the substrate is respectively attached to the fixed roller, the first tension roller, and the second tension roller.

2. The coating roller assembly according to claim 1, characterized in that: The outer circumferential surface of the fixed roller is provided with a wear-resistant layer for attaching the substrate, or the fixed roller is made of a wear-resistant material.

3. The coating roller assembly according to claim 2, characterized in that: The wear-resistant layer is made of ceramic, polyethylene, polyetheretherketone, or nylon material, or the wear-resistant material is ceramic, polyethylene, polyetheretherketone, or nylon.

4. The coating roller assembly according to claim 1, characterized in that: The straightness of the fixed roller is ≤0.2µm.

5. The coating roller assembly according to claim 1, characterized in that: The coefficient of sliding friction between the fixed roller and the substrate is 0.32-0.

77.

6. The coating roller assembly according to claim 1, characterized in that: The support includes a first upright plate and a second upright plate, which are arranged opposite to each other. The fixed roller, the first tension roller and the second tension roller are all located between the first upright plate and the second upright plate.

7. The coating roller assembly according to claim 6, characterized in that: The support also includes a crossbeam, and the first upright plate and the second upright plate are respectively connected to the crossbeam.

8. The coating roller assembly according to claim 1, characterized in that: It also includes a drive component, which is connected to the bracket and is used to drive the bracket to rotate.

9. The coating roller assembly according to claim 8, characterized in that: The fixed rollers are multiple, and the multiple fixed rollers are arranged at circumferential intervals.

10. A coating apparatus characterized by comprising: include: The base, the coating die, and the coating roller assembly as described in any one of claims 1-9, wherein the coating die and the coating roller assembly are both disposed on the base, the fixed roller is disposed opposite to the coating die, and the coating die is used to coat the surface of the substrate when the substrate passes through the fixed roller.

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