Coating die and coating apparatus
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- UNITED AUTO BATTERY CO LTD
- Filing Date
- 2025-07-14
- Publication Date
- 2026-08-07
Smart Images
Figure CN224599691U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of battery electrode processing equipment, and more specifically, to a coating die and coating apparatus. Background Technology
[0002] Coating is an essential step in battery production, primarily used in the fabrication of battery electrodes. Electrode coating refers to the process of applying a prepared, viscous paste-like slurry evenly, continuously, or intermittently, onto the electrode substrate through a coating die and coating nozzle.
[0003] In the development of coating equipment, in addition to improving the coating quality, the manufacturing cost of coating equipment is also an issue that cannot be ignored. Therefore, how to reduce the manufacturing cost of coating equipment is also a technical problem that needs continuous improvement in coating processing. Utility Model Content
[0004] This application provides a coating die and coating apparatus, which can reduce the manufacturing cost of the coating apparatus.
[0005] In a first aspect, embodiments of this application provide a coating die head, including a die head body and a gasket; the die head body includes a first die head and a second die head stacked along its height direction, the first die head and the second die head surrounding to form a receiving cavity for receiving a first slurry; the gasket has a first flow channel for receiving a second slurry; wherein, the gasket includes a gasket body and a first flow channel module, a portion of the gasket body on one side of the die head body in the width direction is recessed to form a first groove, the first flow channel module is detachably installed in the first groove, the first flow channel is located on the first flow channel module, and the width direction is perpendicular to the height direction.
[0006] In the above technical solution, the gasket body is recessed on one side of the die head body in the width direction to form a first groove. The first flow channel module is detachably installed in the first groove, and the first flow channel is located on the first flow channel module. This allows the gasket to have a first flow channel with different structures by replacing different first flow channel modules, thereby meeting the different coating requirements of the second slurry when coating different electrodes. This eliminates the need to manufacture corresponding gaskets for each requirement, reducing the production cost of the gaskets. On the other hand, when storing the gaskets, only the general gasket body and part of the first flow channel module need to be stored, thus reducing the space required for storage and the cost of managing and storing the gaskets compared to storing a large number of gaskets.
[0007] In some embodiments, the groove wall of the first groove is provided with a first strong magnetic coating.
[0008] In the above technical solution, by providing a first strong magnetic coating on the groove wall of the first groove, the first flow channel module can be detachably installed in the first groove by strong magnetic adsorption. Compared with snap-fit and bolt connection, this method facilitates the rapid adsorption and positioning of the first flow channel module, thereby improving the installation efficiency of the first flow channel module. On the other hand, it reduces structural wear during installation, extends the service life of the first flow channel module, and reduces the replacement cost of the first flow channel module.
[0009] In some embodiments, the coating die head further includes a pressure strip connected to the second die head and located within the receiving cavity, and the gasket is sandwiched between the pressure strip and the second die head along the height direction.
[0010] In the above technical solution, by clamping the gasket between the pressure strip and the second die head, the pressure strip applies a squeezing force to the gasket, thereby enabling the gasket to adhere to the second die head. This reduces the risk of decreased sealing of the receiving cavity due to the gap between the gasket and the second die head, and improves the reliability of the coating die head.
[0011] In some embodiments, the pressure strip is provided with a first through hole, the gasket is provided with a second through hole, and the second die head surface is provided with a threaded hole; the coating die head further includes a connector, which passes through the first through hole and the second through hole in sequence and is threadedly engaged with the threaded hole.
[0012] In the above technical solution, the connection between the connector and the threaded hole allows the pressure strip to detachably press the gasket onto the second mold head, which is a simple and easy-to-implement structure.
[0013] In some embodiments, the first through hole, the second through hole, the threaded hole and the connector are a plurality of corresponding components, with some of the second through holes located in the gasket body and others located in the first flow channel module.
[0014] In the above technical solution, some of the second through holes are located in the gasket body, and the other part of the second through holes are located in the first flow channel module. This allows some connectors to be inserted into the second through holes in the gasket body to restrict the movement of the gasket body along the length and width directions, and allows the other part of the connectors to be inserted into the second through holes in the first flow channel module to restrict the movement of the first flow channel module along the length and width directions. Thus, during the use of the coating die head, the first flow channel module and the gasket body are relatively fixed, thereby reducing the risk of a gap between the first flow channel module and the gasket body caused by the movement of the first flow channel module relative to the gasket body, which would lead to a decrease in the sealing performance of the receiving cavity, and improving the reliability of the coating die head.
[0015] In some embodiments, along the width direction, the first flow channel module has a first side facing away from the bottom wall of the first groove, a portion of the first side is recessed to form a coating groove, the coating groove and the opposite sides of the first die head and the second die head enclose to form a first lip communicating with the receiving cavity; the number of first flow channels on the same first flow channel module is two, along the length direction of the die head body, the coating groove is located between the two first flow channels, the length direction, the width direction and the height direction are perpendicular to each other.
[0016] In the above technical solution, by setting the two first channels in the same first channel module, the first channels on both sides of the coating groove can be replaced simultaneously when the first channel is replaced, thereby improving the adjustment efficiency of the gasket.
[0017] In some embodiments, the first flow channel module includes a turbulence protrusion that protrudes from the bottom wall of the coating groove.
[0018] In the above technical solution, by setting turbulence protrusions, the first slurry can be distributed more evenly in the length direction of the turbulence protrusions. This reduces the risk of different lateral weight distribution of the first slurry due to different compositions when coating different first slurries with the same coating die. This improves the consistency of weight distribution in the coating area, enhances the versatility of the gasket, and saves costs.
[0019] In some embodiments, along the width direction, the first flow channel module has a second side that abuts against the bottom wall of the first groove; and on a plane perpendicular to the height direction, the orthographic projection of the second side does not overlap with the orthographic projection of the receiving cavity.
[0020] In the above technical solution, the orthographic projection of the second side does not overlap with the orthographic projection of the receiving cavity on a plane perpendicular to the height direction. That is, after the coating die head is assembled, the gap between the second side and the bottom wall of the first groove is not connected to the receiving cavity, thereby reducing the risk that the first slurry will enter the gap between the second side and the bottom wall of the first groove and flow out of the coating die head, causing the first slurry and the second slurry to mix.
[0021] In some embodiments, the gasket further includes a first thinning module. Along the length direction of the die head body, the coating groove has a first groove wall and a second groove wall disposed opposite to each other. The first thinning module is detachably disposed on the first groove wall to cover part of the first lip. The length direction, the width direction and the height direction are perpendicular to each other.
[0022] In the above technical solution, the first thinning module is detachably disposed on the first groove wall to cover part of the first lip, so that by replacing different first thinning modules, the gasket can have different structural lip thinning areas, thereby meeting the different requirements for the thickness of the first slurry near the edge of the second slurry when coating different electrodes, thus eliminating the need to manufacture a corresponding first flow channel module for each requirement, thereby further reducing the production cost of the gasket.
[0023] In some embodiments, the first thinning module includes a first connecting portion and a first thinning boss. The surface of the first connecting portion facing the first groove wall is provided with a second strong magnetic coating, and the first thinning boss protrudes from the side of the first connecting portion away from the first groove wall.
[0024] In the above technical solution, by providing a second strong magnetic coating on the surface of the first connecting part facing the first groove wall, the first thinning module can be detachably installed on the first groove wall by strong magnetic adsorption. Compared with snap-fit, bolt connection and other methods, the first thinning module can be quickly adsorbed and positioned, thereby improving the installation efficiency of the first thinning module.
[0025] In some embodiments, the first thinning boss includes a plurality of first thinning regions arranged along the length direction, and the thickness of the plurality of first thinning regions gradually decreases along the direction from the first groove wall to the second groove wall.
[0026] In the above technical solution, the thickness of the multiple first thinning zones gradually decreases along the direction from the first sidewall to the second sidewall, thereby making the flow rate of the slurry per unit length lower along the length direction, which further alleviates the coating thickening caused by the slurry drying too quickly at the edge, and even the formation of edge shrinkage or curling, thereby further improving the coating quality.
[0027] In some embodiments, the dimension of the first connecting portion in the width direction is greater than the dimension of the first thinned boss in the width direction.
[0028] In the above technical solution, the dimension of the first connecting part in the width direction is larger than the dimension of the first thinned boss in the width direction, thereby increasing the area of the first connecting part that can be used to set the second strong magnetic coating, thereby increasing the connection area between the first connecting part and the first groove wall, reducing the risk of the first connecting part falling off the first groove wall, and thus improving the reliability of the connection between the first connecting part and the first groove wall.
[0029] In some embodiments, the gasket further has a second channel for receiving a second slurry, the gasket further includes a second channel module, a portion of the gasket body on one side in the width direction of the die head body is recessed to form a second groove, the first groove and the second groove are spaced apart along the length direction of the die head body, the second channel module is detachably mounted in the second groove, and the second channel is located on the second channel module.
[0030] In the above technical solution, the gasket body is recessed on one side of the die head body in the width direction to form a second groove. The second flow channel module is detachably installed in the second groove, and the second flow channel is located on the second flow channel module. This allows the gasket to have a second flow channel with different structures by replacing different second flow channel modules, thereby meeting the different coating requirements of the second slurry when coating different electrodes. This eliminates the need to manufacture corresponding gaskets for each requirement, reducing the production cost of the gaskets. On the other hand, when storing the gaskets, only the general gasket body and part of the second flow channel module need to be stored, thus reducing the space required for storage and the cost of managing and storing the gaskets compared to storing a large number of gaskets.
[0031] Secondly, embodiments of this application also provide a coating apparatus, including the coating die head described in any embodiment of the first aspect. Attached Figure Description
[0032] 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.
[0033] Figure 1 Exploded views of the coating die provided in some embodiments of this application;
[0034] Figure 2 This is a schematic diagram of the structure of a gasket provided in some embodiments of this application;
[0035] Figure 3 This is a schematic diagram of the structure of the gasket body provided in some embodiments of this application;
[0036] Figure 4 This is a schematic diagram of the structure of a first flow channel module provided in some embodiments of this application;
[0037] Figure 5 Cross-sectional views of coating dies provided in some embodiments of this application;
[0038] Figure 6 for Figure 2 Enlarged view of point A in the middle;
[0039] Figure 7 for Figure 5 Sectional view of BB;
[0040] Figure 8 A schematic diagram of the structure of the first thinning module provided in some embodiments of this application;
[0041] Figure 9 This is a schematic diagram of the structure of the first thinning module provided in some embodiments of this application in another direction.
[0042] Icons: 100-Coating die head; 10-Die head body; 10A-Receiving cavity; 11-First die head; 111-Receiving groove; 12-Second die head; 20-Gasket; 20A-Second through hole; 21-Gasket body; 21A-First groove segment; 211-First groove; 212-Second groove; 22-First flow channel module; 22A-Second groove segment; 221-First flow channel; 222-First side; 2221-Coating recess 2221A - First groove wall; 2221B - Second groove wall; 223 - Second side; 224 - Turbulence protrusion; 23 - Second flow channel module; 231 - Second flow channel; 24 - First thinning module; 241 - First connecting part; 242 - First thinning boss; 242A - First thinning area; 25 - Second thinning module; 30 - Pressure strip; 40 - Connector; X - Height direction; Y - Width direction; Z - Length direction. Detailed Implementation
[0043] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0044] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.
[0045] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.
[0046] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication 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.
[0047] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.
[0048] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.
[0049] In this application, "multiple" means two or more (including two).
[0050] Electrode coating is a crucial step in lithium-ion battery production, involving the uniform, continuous, or intermittent application of a prepared coating slurry onto a substrate (aluminum or copper foil). The coating process requires ensuring consistent thickness across all coating locations and controlling the coating thickness within the specified tolerances. The quality and stability of the electrode coating process significantly impact battery performance and cycle life.
[0051] Currently, there are two commonly used coating methods in China: transfer coating and extrusion coating. Transfer coating is a mature technology, but its structure is complex and equipment debugging is cumbersome. Moreover, the slurry in transfer coating is in an exposed state (i.e., the coating slurry is exposed to the air), making it difficult to guarantee the performance of the coating slurry.
[0052] Extrusion coating technology is becoming increasingly mature, featuring a simple structure, compact equipment, and convenient debugging. Furthermore, the coating slurry within the coating head is in a closed state, isolated from the outside environment, ensuring the high quality of the coating slurry. Moreover, the coating precision of extrusion coating machines is significantly higher than that of traditional transfer coating machines. Current experimental results show that the minimum thickness limit for transfer coating is 50µm, while extrusion coating can reach 20µm. Therefore, using extrusion coating machines for coating lithium-ion battery electrodes has become a development trend.
[0053] The coating die is an important component of the coating apparatus, used to uniformly apply the coating slurry to the surface of the substrate. The coating die typically has a cavity inside to hold the first slurry (negative electrode active material). The gasket of the coating die usually has channels to hold the second slurry (tab adhesive).
[0054] As an example, the negative electrode substrate can be a metal foil, a foamed metal, or a composite current collector. For example, as a metal foil, it can be silver-treated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, carbon electrodes, nickel, or titanium, etc. Foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloys, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can be formed by forming a metal material (copper, copper alloys, nickel, nickel alloys, titanium, titanium alloys, silver and silver alloys, etc.) on a polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).
[0055] As an example, the negative electrode sheet may include a negative electrode substrate and a negative electrode active material disposed on at least one surface of the negative electrode substrate.
[0056] As an example, the negative electrode substrate has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode substrate.
[0057] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cells. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. Silicon-based materials may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, this application is not limited to these materials, and other conventional materials that can be used as battery negative electrode active materials may also be used. These negative electrode active materials may be used alone or in combination of two or more.
[0058] When coating cathode electrodes, tab adhesive needs to be applied to both sides of the active material slurry. Since both slurries are applied simultaneously through the same coating die, different coating thicknesses and widths of the second slurry are required when coating different types of cathode electrodes. Therefore, it is necessary to change the shims to adjust parameters such as the width and depth of the flow channels. Furthermore, during electrode product prototyping, it is often necessary to adjust the thickness and width parameters of the second slurry. This necessitates the manufacture of additional shims with different flow channel types to facilitate adjustments during prototyping. Shims that do not meet the requirements are discarded after prototyping, significantly increasing the manufacturing cost of the coating equipment.
[0059] Based on the above considerations, in order to reduce the manufacturing cost of the coating apparatus, this application provides a coating die head, including a die head body and a gasket; the die head body includes a first die head and a second die head stacked along its height direction, the first die head and the second die head surrounding to form a receiving cavity for receiving a first slurry; the gasket has a first flow channel for receiving a second slurry; wherein, the gasket includes a gasket body and a first flow channel module, a portion of the gasket body on one side in the width direction of the die head body is recessed to form a first groove, the first flow channel module is detachably installed in the first groove, the first flow channel is located on the first flow channel module, and the width direction is perpendicular to the height direction.
[0060] In this coating die head structure, the gasket body is recessed on one side of the die head body in the width direction to form a first groove. The first flow channel module is detachably installed in the first groove, and the first flow channel is located on the first flow channel module. This allows the gasket to have a first flow channel with different structures by replacing different first flow channel modules, thereby meeting the different coating requirements of the second slurry when coating different electrodes. This eliminates the need to manufacture corresponding gaskets for each requirement, reducing the production cost of the gaskets. On the other hand, when storing the gaskets, only the common gasket body and part of the first flow channel module need to be stored, thus reducing the space required for storage and the cost of managing and storing the gaskets compared to storing a large number of gaskets.
[0061] The specific structure of the coating die head will be described in detail below with reference to the accompanying drawings.
[0062] Please refer to Figures 1-4 , Figure 1 This is an exploded view of the structure of the coating die 100 provided in some embodiments of this application. Figure 2 This is a schematic diagram of the structure of the gasket 20 provided in some embodiments of this application. Figure 3 This is a schematic diagram of the structure of the gasket body 21 provided in some embodiments of this application. Figure 4This is a schematic diagram of the structure of the first flow channel module 22 provided in some embodiments of this application. Embodiments of this application provide a coating die 100, including a die body 10 and a gasket 20; the die body 10 includes a first die 11 and a second die 12 stacked along its height direction X, the first die 11 and the second die 12 forming a receiving cavity 10A for receiving a first slurry; the gasket 20 has a first flow channel 221 for receiving a second slurry; wherein, the gasket 20 includes a gasket body 21 and a first flow channel module 22, a portion of the gasket body 21 recessed on one side in the width direction Y of the die body 10 to form a first groove 211, the first flow channel module 22 being detachably installed in the first groove 211, the first flow channel 221 being located on the first flow channel module 22, the width direction Y being perpendicular to the height direction X.
[0063] The die body 10 is the portion of the coating die 100 used to uniformly apply the coating slurry to the surface of the substrate. Exemplarily, the die body 10 is generally made of metal to provide high strength and rigidity, thereby reducing the risk of deformation of the die body 10 when the pressure in the receiving cavity 10A is too high.
[0064] The first mold head 11 and the second mold head 12 are the main body parts of the mold head body 10.
[0065] Understandably, the first mold head 11 and the second mold head 12 are generally made of metal to have high strength and rigidity, thereby reducing the risk of deformation of the mold head body 10 when the pressure in the receiving cavity 10A is too high.
[0066] For example, the first mold head 11 and the second mold head 12 can be connected by screws, or the first mold head 11 and the second mold head 12 can be connected by snap-fit, or the first mold head 11 and the second mold head 12 can be clamped by a fixture.
[0067] The receiving cavity 10A is the space in the die head body 10 used to receive the slurry.
[0068] The first die head 11 and the second die head 12 together form a receiving cavity 10A for receiving slurry. This can be understood as the receiving cavity 10A being formed by the opposing sides of the first die head 11 and the second die head 12. Exemplarily, the side of one of the first die head 11 and the second die head 12 facing the other is recessed to form a receiving groove 111, and the receiving groove 111 and the side of the other die head facing the receiving groove 111 together form the receiving cavity 10A.
[0069] If the receiving groove 111 is located on the side of the first die 11 facing the second die 12, the receiving groove 111 and the side of the second die 12 facing the first die 11 together form a receiving cavity 10A; if the receiving groove 111 is located on the side of the second die 12 facing the first die 11, the receiving groove 111 and the side of the first die 11 facing the second die 12 together form a receiving cavity 10A. The structure of the coating die 100 will be described below with the receiving groove 111 located on the first die 11 as an example.
[0070] In some embodiments, the die head body 10 has a feed inlet communicating with the receiving cavity 10A, through which slurry from the slurry tank enters the receiving cavity 10A.
[0071] The gasket 20 is a component disposed between the first mold head 11 and the second mold head 12 to form a lip between the first mold head 11 and the second mold head 12. Exemplarily, the gasket 20 is generally a metal part to have high strength and rigidity, thereby reducing the risk of deformation of the mold head body 10 when the pressure in the receiving cavity 10A is too high.
[0072] In some embodiments, the receiving cavity 10A is used to receive a first slurry (active material), and the gasket 20 is provided with a first flow channel 221 to receive a second slurry (insulating material). The outlet of the first flow channel 221 is located on one side of the lip in the length direction Z.
[0073] The gasket body 21 is the main body of the gasket 20.
[0074] The first groove 211 is a groove-shaped structure formed by a partial indentation on one side of the gasket body 21 in the width direction Y. The first groove 211 on the gasket body 21 can be manufactured simultaneously with the gasket body 21 using a one-piece molding process such as casting, so that the gasket body 21 with the first groove 211 can be manufactured as a whole. This not only makes the manufacturing of the gasket body 21 convenient, but also gives the overall structure of the gasket body 21 good strength. The first groove 211 can also be manufactured by machining the gasket body 21 from a single blank using a machining method such as milling, so that the gasket body 21 has lower processing difficulty and processing cost.
[0075] The first flow channel module 22 is the part of the gasket 20 in which the first flow channel 221 is provided.
[0076] It is understandable that the first flow channel module 22 and the gasket body 21 are separate structures.
[0077] "The first flow channel module 22 is detachably installed in the first groove 211" means that the first flow channel module 22 is connected to the groove wall of the first groove 211 by means of bolt connection, snap-fit or other detachable means.
[0078] In some embodiments, the first flow channel module 22 is detachably mounted on the sidewall of the first groove 211; in some embodiments, the first flow channel module 22 is detachably mounted on the bottom wall of the first groove 211.
[0079] In this embodiment, the gasket body 21 is partially recessed on one side of the die head body 10 in the width direction Y to form a first groove 211. The first flow channel module 22 is detachably installed in the first groove 211, and the first flow channel 221 is located on the first flow channel module 22. This allows the gasket 20 to have different structures of first flow channels 221 by replacing different first flow channel modules 22, thereby meeting the different coating requirements of the second slurry when coating different electrodes. This eliminates the need to manufacture corresponding gaskets 20 for each requirement, thereby reducing the production cost of the gasket 20. On the other hand, when storing the gasket 20, only the common gasket body 21 and part of the first flow channel module 22 need to be stored, thereby reducing the space required for storage and the cost of managing and storing the gasket 20 compared to storing a large number of gaskets 20.
[0080] According to some embodiments of this application, the groove wall of the first groove 211 is provided with a first strong magnetic coating.
[0081] A strong magnetic coating refers to a layer of material with strong magnetic properties (mainly strong ferromagnetism or permanent magnetism) applied to the surface of an object. This coating imparts strong magnetic properties to the substrate that it does not possess, or significantly enhances its original magnetism.
[0082] For example, the first strong magnetic coating may be a ferrite permanent magnet material coating, a rare earth permanent magnet material coating, or a ferromagnetic metal powder coating.
[0083] In this embodiment, by providing a first strong magnetic coating on the groove wall of the first groove 211, the first flow channel module 22 is detachably installed in the first groove 211 by strong magnetic adsorption. Compared with snap-fit or bolt connection, this method facilitates the rapid adsorption and positioning of the first flow channel module 22, thereby improving the installation efficiency of the first flow channel module 22. On the other hand, it reduces structural wear during installation, extends the service life of the first flow channel module 22, and reduces the replacement cost of the first flow channel module 22.
[0084] Please refer to Figure 5 , Figure 5 This is a cross-sectional view of a coating die 100 provided in some embodiments of this application. According to some embodiments of this application, the coating die 100 further includes a pressure strip 30 connected to a second die 12 and located within a receiving cavity 10A, with a gasket 20 sandwiched between the pressure strip 30 and the second die 12 along the height direction X.
[0085] The pressure strip 30 is a structural component installed in the receiving cavity 10A to press the gasket 20.
[0086] For example, the pressure strip 30 is an elongated metal piece disposed within the receiving cavity 10A. The pressure strip 30 extends along the length direction Z.
[0087] Understandably, the gasket 20 is generally a sheet-like structure with a small thickness, resulting in low strength and susceptibility to elastic deformation. Therefore, after fixing both ends of the gasket 20 along the Z-direction to the second die head 12, the middle part of the gasket 20 tends to bend towards the first die head 11, causing a gap between the gasket 20 and the second die head 12. This allows the first slurry to easily leak from the gap between the gasket 20 and the second die head 12. The pressure strip 30 secures the gasket 20 to the second die head 12, compressing the gasket 20 and preventing gaps from forming between them, thus improving the sealing performance.
[0088] In some embodiments, the receiving groove 111 is disposed on the side of the first mold head 11 facing the second mold head 12, and the pressure strip 30 is disposed on the side of the second mold head 12 facing the first mold head 11, with a portion of the pressure strip 30 located within the receiving groove 111.
[0089] In this embodiment, by sandwiching the gasket 20 between the pressure strip 30 and the second die head 12, the pressure strip 30 applies a compressive force to the gasket 20, thereby enabling the gasket 20 to adhere to the second die head 12. This reduces the risk of decreased sealing of the receiving cavity 10A due to the gap between the gasket 20 and the second die head 12, and improves the reliability of the coating die head 100.
[0090] Please refer to Figure 5 According to some embodiments of this application, the pressure strip 30 is provided with a first through hole, the gasket 20 is provided with a second through hole 20A, and the second die head 12 is provided with a threaded hole; the coating die head 100 also includes a connector 40, which passes through the first through hole and the second through hole 20A in sequence and is threadedly engaged with the threaded hole.
[0091] Understandably, the outer circumference of the end of the connector 40 that mates with the threaded hole is provided with an external thread that mates with the threaded hole.
[0092] In some embodiments, the connector 40 is a screw. The first through hole is a countersunk hole, and the inner diameter of the section of the countersunk hole away from the gasket 20 is larger than the inner diameter of the section of the countersunk hole near the gasket 20, so as to form a stepped surface in the first through hole. The non-nut end of the connector 40 passes through the first through hole and the second through hole 20A and is threaded into the threaded hole. The nut end of the connector 40 abuts against the stepped surface so that the pressure strip 30 presses the gasket 20 against the second die head 12.
[0093] In this embodiment, the connection of the connector 40 and the threaded hole allows the pressure strip 30 to detachably press the gasket 20 against the second mold head 12, which is a simple and easy-to-implement structure.
[0094] Please refer to Figure 2 , Figure 3 and Figure 4 According to some embodiments of this application, the first through hole, the second through hole 20A, the threaded hole and the connector 40 are multiple in a one-to-one correspondence, with some of the second through holes 20A located in the gasket body 21 and other parts of the second through holes 20A located in the first flow channel module 22.
[0095] In some embodiments, a plurality of connectors 40 are spaced apart along the length direction Z so that the pressure strip 30 more stably presses the gasket 20 against the second mold head 12.
[0096] In this embodiment, a portion of the second through holes 20A is located in the gasket body 21, and another portion of the second through holes 20A is located in the first flow channel module 22. This allows a portion of the connectors 40 to be inserted into the second through holes 20A on the gasket body 21 to restrict the movement of the gasket body 21 along the length direction Z and the width direction Y. Conversely, another portion of the connectors 40 can be inserted into the second through holes 20A on the first flow channel module 22 to restrict the movement of the first flow channel module 22 along the length direction Z and the width direction Y. Thus, during the use of the coating die head 100, the first flow channel module 22 and the gasket body 21 are relatively fixed, thereby reducing the risk of a gap between the first flow channel module 22 and the gasket body 21 caused by the movement of the first flow channel module 22 relative to the gasket body 21, which could lead to a decrease in the sealing performance of the receiving cavity 10A, and improving the reliability of the coating die head 100.
[0097] Please refer to Figure 2 , Figure 3 and Figure 4 According to some embodiments of this application, along the width direction Y, the first flow channel module 22 has a first side 222 facing away from the bottom wall of the first groove 211. Part of the first side 222 is recessed to form a coating groove 2221. The coating groove 2221 and the side facing the first mold head 11 and the second mold head 12 enclose each other to form a first lip communicating with the receiving cavity 10A. The number of first flow channels 221 on the same first flow channel module 22 is two. Along the length direction Z of the mold head body 10, the coating groove 2221 is located between the two first flow channels 221. The length direction Z, the width direction Y and the height direction X are perpendicular to each other.
[0098] The first side 222 is the side of the first flow channel module 22 that is away from the bottom wall of the first groove 211.
[0099] The coating groove 2221 is a groove-shaped structure formed by a partial recess on one side of the first flow channel module 22 in the width direction Y. The coating groove 2221 on the first flow channel module 22 can be manufactured synchronously with the first flow channel module 22 by integral molding methods such as casting, so that the first flow channel module 22 with the coating groove 2221 can be manufactured as a whole synchronously. This not only makes the processing and manufacturing of the first flow channel module 22 convenient, but also gives the overall structure of the first flow channel module 22 good strength. The coating groove 2221 can also be manufactured by machining methods such as milling, by machining the first flow channel module 22 as a whole blank, so that the first flow channel module 22 has lower processing difficulty and processing cost.
[0100] The lip is a slit located on one side of the die head body 10 in the width direction Y and communicating with the receiving cavity 10A. Exemplarily, the lip extends along the length direction Z of the die head body 10. It can be understood that the length of the lip in the length direction Z of the die head body 10 should be adapted to the width of the first slurry coated on the substrate.
[0101] In this embodiment, by setting the two first flow channels 221 in the same first flow channel module 22, the first flow channels 221 on both sides of the coating groove 2221 can be replaced simultaneously when the first flow channel 221 is replaced, thereby improving the adjustment efficiency of the gasket 20.
[0102] Please refer to Figure 4 According to some embodiments of this application, the first flow channel module 22 includes a turbulence protrusion 224 that protrudes from the bottom wall of the coating groove 2221.
[0103] In some embodiments, the turbulence protrusion 224 protrudes from the middle of the bottom wall of the coating groove 2221 in the longitudinal direction Z.
[0104] In this embodiment, by setting the turbulence protrusion 224, the first slurry in the length direction Z of the turbulence protrusion 224 can be distributed more evenly. This reduces the risk of different lateral weight distribution of the first slurry due to different compositions when coating different first slurries with the same coating die 100, thereby improving the consistency of weight distribution in the coating area, improving the versatility of the gasket 20, and saving costs.
[0105] Please refer to Figure 2 , Figure 3 , Figure 4 and Figure 6 , Figure 6 for Figure 2Enlarged view at point A. According to some embodiments of this application, along the width direction Y, the first flow channel module 22 has a second side 223 that abuts against the bottom wall of the first groove 211; on a plane perpendicular to the height direction X, the orthographic projection of the second side 223 does not overlap with the orthographic projection of the receiving cavity 10A.
[0106] The second side 223 is the side of the first flow channel module 22 that is away from the bottom wall of the first groove 211.
[0107] To better illustrate the range of the orthographic projection of the receiving cavity 10A, please refer to... Figure 2 The area of the orthographic projection of the cavity 10A is marked by dashed lines in the figure. It should be noted that the dashed lines are only for the purpose of facilitating the orthographic projection of the cavity 10A and do not represent any physical meaning.
[0108] In some embodiments, please refer to Figure 6 The coating die 100 also includes a seal (not shown in the figure). A sealing groove extending along the length direction Z is provided on the gasket 20. Exemplarily, the sealing groove may penetrate the gasket 20 along the height direction X, or it may not penetrate the gasket 20. The sealing groove includes a first groove segment 21A located on the gasket body 21 and a second groove segment 22A located on the first flow channel module 22. A sealing strip is disposed within the sealing groove. One of the first die 11 and the second die 12 cooperates with the bottom wall of the sealing groove to press the seal, or the first die 11 and the second die 12 cooperate to press the seal. The seal is used to block the first slurry flowing out of the receiving cavity 10A through the gap between the groove sidewall of the first groove 211 and one side of the first flow channel module 22 along the length direction Z.
[0109] In this embodiment, on a plane perpendicular to the height direction X, the orthographic projection of the second side 223 does not overlap with the orthographic projection of the receiving cavity 10A. That is, after the coating die head 100 is assembled, the gap between the second side 223 and the bottom wall of the first groove 211 is not connected to the receiving cavity 10A, thereby reducing the risk that the first slurry will enter the gap between the second side 223 and the bottom wall of the first groove 211 and flow out of the coating die head 100, causing the first slurry and the second slurry to mix.
[0110] Please refer to Figure 6 and Figure 7 , Figure 7 for Figure 5 A cross-sectional view of BB. According to some embodiments of this application, the gasket 20 further includes a first thinning module 24. Along the length direction Z of the die body 10, the coating groove 2221 has a first groove wall 2221A and a second groove wall 2221B disposed opposite to each other. The first thinning module 24 is detachably disposed on the first groove wall 2221A to cover part of the first lip. The length direction Z, the width direction Y and the height direction X are perpendicular to each other.
[0111] The first thinning module 24 is a gasket 20 used to protrude along the length direction Z of the first groove wall 2221A to block part of the first lip.
[0112] Understandably, by setting the first thinning module 24, the flow rate of the first slurry near the first tank wall 2221A can be reduced, thereby thinning the thickness of the edge area of the first slurry coated on the substrate, thereby alleviating the phenomenon of thick edges appearing at the coating edge.
[0113] In some embodiments, the gasket 20 further includes a second thinning module 25, which is detachably disposed on the second groove wall 2221B to cover part of the lip.
[0114] "The first thinning module 24 is detachably disposed on the first groove wall 2221A" means that the first thinning module 24 is detachably connected to the first groove wall 2221A by means of bolt connection, snap-fit, or other detachable means.
[0115] In this embodiment, the first thinning module 24 is detachably disposed on the first groove wall 2221A to cover part of the first lip, thereby allowing the gasket 20 to have different lip thinning areas by replacing different first thinning modules 24, thus meeting the different thickness requirements of the first slurry near the edge of the second slurry when coating different electrodes, thus eliminating the need to manufacture a corresponding first flow channel module 22 for each requirement, thereby further reducing the production cost of the gasket 20.
[0116] Please refer to Figure 8 and Figure 9 , Figure 8 This is a schematic diagram of the structure of the first thinning module 24 provided in some embodiments of this application. Figure 9 This is a schematic diagram of the first thinning module 24 provided in some embodiments of this application in another direction. According to some embodiments of this application, the first thinning module 24 includes a first connecting portion 241 and a first thinning boss 242. The surface of the first connecting portion 241 facing the first groove wall 2221A is provided with a second strong magnetic coating, and the first thinning boss 242 protrudes from the side of the first connecting portion 241 away from the first groove wall 2221A.
[0117] The first connecting part 241 is the part of the first thinning module 24 used to connect with the first groove wall 2221A.
[0118] The first thinning boss 242 is the part of the first thinning module 24 that protrudes from the first groove wall 2221A to block part of the first lip.
[0119] For example, the second strong magnetic coating can be a ferrite permanent magnet material coating, a rare earth permanent magnet material coating, or a ferromagnetic metal powder coating.
[0120] In this embodiment, by providing a second strong magnetic coating on the surface of the first connecting part 241 facing the first groove wall 2221A, the first thinning module 24 can be detachably installed on the first groove wall 2221A by strong magnetic adsorption. Compared with snap-fit, bolt connection and other methods, the first thinning module 24 can be quickly adsorbed and positioned, thereby improving the installation efficiency of the first thinning module 24.
[0121] Please refer to Figure 8 and Figure 9 According to some embodiments of this application, the first thinning boss 242 includes a plurality of first thinning regions 242A arranged along the length direction Z. The thickness of the plurality of first thinning regions 242A gradually decreases along the direction from the first groove wall 2221A to the second groove wall 2221B.
[0122] In this embodiment, the thickness of the multiple first thinning zones 242A gradually decreases along the direction from the first side 222 wall to the second side 223 wall, thereby making the flow rate of the slurry per unit length lower along the length direction Z, which further alleviates the coating thickening caused by the slurry edge drying too quickly, and even the formation of edge shrinkage or curling, thereby further improving the coating quality.
[0123] Please refer to Figure 8 According to some embodiments of this application, the dimension of the first connecting portion 241 in the width direction Y is greater than the dimension of the first thinned boss 242 in the width direction Y.
[0124] In this embodiment, the dimension of the first connecting portion 241 in the width direction Y is larger than the dimension of the first thinned boss 242 in the width direction Y, thereby increasing the area of the first connecting portion 241 that can be used to set the second strong magnetic coating, thereby increasing the connection area between the first connecting portion 241 and the first groove wall 2221A, reducing the risk of the first connecting portion 241 falling off the first groove wall 2221A, and thus improving the reliability of the connection between the first connecting portion 241 and the first groove wall 2221A.
[0125] Please refer to Figure 2 and Figure 3 According to some embodiments of this application, the gasket 20 further has a second flow channel 231 for receiving the second slurry, and the gasket 20 also includes a second flow channel module 23. A portion of the gasket body 21 on one side in the width direction Y of the die head body 10 is recessed to form a second groove 212. The first groove 211 and the second groove 212 are spaced apart along the length direction Z of the die head body 10. The second flow channel module 23 is detachably installed in the second groove 212, and the second flow channel 231 is located on the second flow channel module 23.
[0126] The second groove 212 is a groove-shaped structure formed by a partial indentation on one side of the gasket body 21 in the width direction Y. The second groove 212 on the gasket body 21 can be manufactured simultaneously with the gasket body 21 using a one-piece molding process such as casting, so that the gasket body 21 with the second groove 212 can be manufactured as a whole. This not only makes the manufacturing of the gasket body 21 convenient, but also gives the overall structure of the gasket body 21 good strength. The second groove 212 can also be manufactured by machining the gasket body 21 from a single blank using a machining method such as milling, so that the gasket body 21 has lower processing difficulty and processing cost.
[0127] The second flow channel module 23 is the part of the gasket 20 in which the second flow channel 231 is provided.
[0128] It is understandable that the second flow channel module 23 and the gasket body 21 are separate structures.
[0129] "The second flow channel module 23 is detachably installed in the second groove 212" means that the second flow channel module 23 is connected to the groove wall of the second groove 212 by means of bolt connection, snap-fit or other detachable means.
[0130] In some embodiments, the second flow channel module 23 is detachably mounted on the sidewall of the second groove 212; in some embodiments, the second flow channel module 23 is detachably mounted on the bottom wall of the second groove 212.
[0131] In this embodiment, the gasket body 21 is partially recessed on one side of the die head body 10 in the width direction Y to form a second groove 212. The second flow channel module 23 is detachably installed in the second groove 212, and the second flow channel 231 is located on the second flow channel module 23. This allows the gasket 20 to have a second flow channel 231 with different structures by replacing different second flow channel modules 23, thereby meeting the different coating requirements of the second slurry when coating different electrodes. This eliminates the need to manufacture corresponding gaskets 20 for each requirement, reducing the production cost of the gasket 20. On the other hand, when storing the gasket 20, only the common gasket body 21 and part of the second flow channel module 23 need to be stored, thereby reducing the space required for storage and the cost of managing and storing the gasket 20 compared to storing a large number of gaskets 20.
[0132] This application also provides a coating apparatus, including the coating die head 100 provided in any of the above embodiments.
[0133] According to some embodiments of this application, see Figures 1 to 9As shown, this application provides a coating die 100 including a die body 10 and a gasket 20; the die body 10 includes a first die 11 and a second die 12 stacked along its height direction X, the first die 11 and the second die 12 surrounding to form a receiving cavity 10A for receiving a first slurry; the gasket 20 has a first flow channel 221 for receiving a second slurry; wherein, the gasket 20 includes a gasket body 21 and a first flow channel module 22, a portion of the gasket body 21 on one side in the width direction Y of the die body 10 is recessed to form a first groove 211, the first flow channel module 22 is detachably installed in the first groove 211, and the first flow channel 221 is located on the first flow channel module 22. The gasket 20 also has a second flow channel 231 for receiving the second slurry. The gasket 20 further includes a second flow channel module 23. A portion of the gasket body 21 on one side in the width direction Y of the die head body 10 is recessed to form a second groove 212. The first groove 211 and the second groove 212 are spaced apart along the length direction Z of the die head body 10. The second flow channel module 23 is detachably mounted in the second groove 212, and the second flow channel 231 is located on the second flow channel module 23. The length direction Z, the width direction Y, and the height direction X are all perpendicular to each other.
[0134] The groove wall of the first groove 211 is provided with a first strong magnetic coating. The coating die head 100 also includes a pressure strip 30, which is connected to the second die head 12 and located in the receiving cavity 10A. A gasket 20 is sandwiched between the pressure strip 30 and the second die head 12 along the height direction. The pressure strip 30 is provided with a first through hole, the gasket 20 is provided with a second through hole 20A, and the surface of the second die head 12 is provided with a threaded hole. The coating die head 100 also includes a connector 40, which passes through the first through hole and the second through hole 20A in sequence and is threadedly engaged with the threaded hole. There are multiple first through holes, second through holes 20A, threaded holes, and connectors 40 in a one-to-one correspondence. Some of the second through holes 20A are located in the gasket body 21, and other parts of the second through holes 20A are located in the first flow channel module 22.
[0135] Along the width direction Y, the first flow channel module 22 has a first side 222 facing away from the bottom wall of the first groove 211. A portion of the first side 222 is recessed to form a coating groove 2221. The coating groove 2221, together with the sides of the first die head 11 and the second die head 12, forms a first lip communicating with the receiving cavity 10A. There are two first flow channels 221 on the same first flow channel module 22, and the coating groove 2221 is located between the two first flow channels 221 along the length direction Z of the die head body 10. The first flow channel module 22 includes a turbulence protrusion 224, which protrudes from the bottom wall of the coating groove 2221. Along the width direction Y, the first flow channel module 22 has a second side 223 abutting against the bottom wall of the first groove 211. On a plane perpendicular to the height direction X, the orthographic projection of the second side 223 does not overlap with the orthographic projection of the receiving cavity 10A.
[0136] The gasket 20 also includes a first thinning module 24. Along the length direction Z of the die body 10, the coating groove 2221 has a first groove wall 2221A and a second groove wall 2221B disposed opposite to each other. The first thinning module 24 is detachably disposed on the first groove wall 2221A to cover part of the first lip. The first thinning module 24 includes a first connecting portion 241 and a first thinning boss 242. The surface of the first connecting portion 241 facing the first groove wall 2221A is provided with a second strong magnetic coating. The first thinning boss 242 protrudes from the side of the first connecting portion 241 away from the first groove wall 2221A. The first thinning boss 242 includes a plurality of first thinning areas 242A arranged along the length direction Z. Along the direction from the first groove wall 2221A to the second groove wall 2221B, the thickness of the plurality of first thinning areas 242A gradually decreases. The dimension of the first connecting portion 241 in the width direction Y is larger than the dimension of the first thinning boss 242 in the width direction Y.
[0137] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.
[0138] The above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit this application. For those skilled in the art, this application can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.
Claims
1. A coating die head, characterized in that, include: The die head body includes a first die head and a second die head stacked along its height direction, the first die head and the second die head forming a receiving cavity for receiving a first slurry; The gasket has a first flow channel for receiving the second slurry; The gasket includes a gasket body and a first flow channel module. The gasket body is recessed on one side of the mold head body in the width direction to form a first groove. The first flow channel module is detachably installed in the first groove. The first flow channel is located on the first flow channel module. The width direction is perpendicular to the height direction.
2. The coating die head as described in claim 1, characterized in that, The groove wall of the first groove is provided with a first strong magnetic coating.
3. The coating die head as described in claim 1, characterized in that, The coating die head also includes a pressure strip, which is connected to the second die head and located in the receiving cavity, and the gasket is sandwiched between the pressure strip and the second die head along the height direction.
4. The coating die head as described in claim 3, characterized in that, The pressure strip is provided with a first through hole, the gasket is provided with a second through hole, and the second die head surface is provided with a threaded hole; The coating die head also includes a connector, which passes through the first through hole and the second through hole in sequence and is threadedly engaged with the threaded hole.
5. The coating die head as described in claim 4, characterized in that, The first through hole, the second through hole, the threaded hole and the connector are a plurality of one-to-one correspondences. Some of the second through holes are located in the gasket body and other parts of the second through holes are located in the first flow channel module.
6. The coating die head as described in claim 1, characterized in that, Along the width direction, the first flow channel module has a first side facing away from the bottom wall of the first groove, a portion of the first side is recessed to form a coating groove, the coating groove and the sides opposite to the first mold head and the second mold head surround to form a first lip communicating with the receiving cavity; The number of first channels on the same first channel module is two. Along the length direction of the die head body, the coating groove is located between the two first channels, and the length direction, the width direction and the height direction are perpendicular to each other.
7. The coating die head as described in claim 6, characterized in that, The first flow channel module includes a turbulence protrusion that protrudes from the bottom wall of the coating groove.
8. The coating die head as described in claim 6, characterized in that, Along the width direction, the first flow channel module has a second side that abuts against the bottom wall of the first groove; On a plane perpendicular to the height direction, the orthographic projection of the second side does not overlap with the orthographic projection of the receiving cavity.
9. The coating die head as described in claim 6, characterized in that, The gasket also includes a first thinning module. Along the length direction of the die head body, the coating groove has a first groove wall and a second groove wall that are arranged opposite to each other. The first thinning module is detachably disposed on the first groove wall to cover part of the first lip. The length direction, the width direction and the height direction are perpendicular to each other.
10. The coating die head as described in claim 9, characterized in that, The first thinning module includes a first connecting part and a first thinning boss. The surface of the first connecting part facing the first groove wall is provided with a second strong magnetic coating. The first thinning boss protrudes from the side of the first connecting part away from the first groove wall.
11. The coating die head as described in claim 10, characterized in that, The first thinning boss includes a plurality of first thinning zones arranged along the length direction, and the thickness of the plurality of first thinning zones gradually decreases along the direction from the first groove wall to the second groove wall.
12. The coating die head as described in claim 10, characterized in that, The dimension of the first connecting portion in the width direction is greater than the dimension of the first thinned boss in the width direction.
13. The coating die head as described in any one of claims 1-12, characterized in that, The gasket also has a second flow channel for receiving the second slurry. The gasket also includes a second flow channel module. A portion of the gasket body on one side of the die head body in the width direction is recessed to form a second groove. The first groove and the second groove are spaced apart along the length direction of the die head body. The second flow channel module is detachably installed in the second groove, and the second flow channel is located on the second flow channel module.
14. A coating apparatus, characterized in that, It includes the coating die head according to any one of claims 1-13.