Coating die head and coating device

Abstract

The utility model discloses a coating die head and a coating device, and belongs to the field of battery pole piece processing equipment. A coating die includes a die body and a shim assembly. The die head body comprises a first die head and a second die head which are arranged in a stacked mode in the first direction, and a first containing cavity used for containing first slurry is defined by the first die head and the second die head. The gasket assembly is provided with a first part located between the first die head and the second die head in the first direction, a first coating opening communicating with the first containing cavity is defined by the first part and the opposite side faces of the first die head and the second die head, and the gasket assembly is provided with a runner used for containing second slurry. The gasket assembly is provided with a second part protruding out of the die head body in the second direction, the second part is provided with a second coating opening communicated with the runner, and the first direction is perpendicular to the second direction. By adopting the coating die head with the structure, the risk of cathode tab redundancy can be reduced.

Description

Technical Field

[0001] The present application relates to the field of battery pole piece processing equipment, and more specifically, to a coating die head and a coating device. Background Art

[0002] Coating is an essential process in battery production, primarily used in the production of battery pole pieces. Coating in pole piece production involves applying a prepared, viscous, paste-like slurry evenly, continuously, or intermittently, to the pole piece substrate through a coating die head and a coating port. The distance between the coating port and the substrate determines the coating thickness of the slurry.

[0003] When coating the cathode electrode, tab glue needs to be applied on both sides of the active material slurry. Since both slurries are applied simultaneously through the same coating die, the thickness of the tab glue increases as the coating thickness of the active material slurry increases. This in turn leads to a thicker tab glue on the cathode electrode, increasing the risk of redundant cathode tabs. Utility Model Content

[0004] The embodiments of the present application provide a coating die and a coating device, which can reduce the thickness of the tab glue on the cathode electrode to reduce the risk of cathode tab redundancy.

[0005] In the first aspect, an embodiment of the present application provides a coating die including a die body and a gasket assembly. The die body includes a first die and a second die stacked along a first direction, and the first die and the second die enclose a first accommodating cavity for accommodating a first slurry. The gasket assembly has a first portion located between the first die and the second die along the first direction, and the first portion and the side opposite to the first die and the second die enclose a first coating port connected to the first accommodating cavity, and the gasket assembly has a flow channel for accommodating a second slurry. The gasket assembly has a second portion protruding from the die body along the second direction, and the second portion has a second coating port connected to the flow channel, and the first direction is perpendicular to the second direction.

[0006] In the above technical solution, the first part of the gasket assembly is enclosed with the sides opposite to the first die and the second die to form a first coating port connected to the first accommodating cavity, and the second part of the gasket assembly protrudes from the die body along the second direction and has a second coating port connected to the flow channel, so that along the second direction, the distance between the second coating port and the substrate is smaller than the distance between the first coating port and the substrate, so that when coating the cathode electrode, the thickness of the second slurry that can be accommodated between the substrate and the second coating port is smaller than the thickness of the first slurry that can be accommodated between the substrate and the first coating port, thereby reducing the thickness of the tab glue on the cathode electrode and reducing the risk of cathode tab redundancy.

[0007] In some embodiments, one side of the gasket assembly in the second direction is recessed to form a notch, and a portion of the notch located within the first portion is enclosed by opposite sides of the first die and the second die to form a first coating port.

[0008] In the above technical solution, by clamping the gasket assembly between the first die head and the second die head, and connecting the notch on the gasket assembly with the accommodating cavity, the gasket assembly, the first die head and the second die head can form a first coating port connected with the accommodating cavity and the outside world, so that the first slurry in the accommodating cavity can flow into the notch and flow out to the outside world for coating. The structure is simple and easy to implement.

[0009] In some embodiments, the notch and the second coating port are spaced apart along the third direction, and the first direction, the second direction and the third direction are perpendicular to each other.

[0010] In the above technical solution, the notch and the second coating port are spaced apart along the third direction. When coating the cathode electrode, the second slurry flowing out of the second coating port is located on the side of the first slurry flowing out of the notch in the third direction, thereby reducing the risk of the first slurry and the second slurry being mixed when the first slurry and the second slurry are coated on the substrate at the same position in the third direction.

[0011] In some embodiments, the notch has a first side close to the flow channel in the third direction, the first side has a first guide surface, and the first guide surface is used to guide the first slurry to move toward the second coating port.

[0012] In the above technical solution, the notch has a first side close to the flow channel in the third direction, and the first side has a first guide surface. The first guide surface is used to guide the first slurry to move toward the second coating port. When coating the cathode electrode, the first slurry moves along the first guide surface toward the second coating port, thereby making the first slurry abut against the second slurry in the third direction, reducing the risk of bulging at the edges of the first slurry and the second slurry in the third direction due to the coffee ring effect.

[0013] In some embodiments, at least a portion of the first guide surface is disposed on the first portion.

[0014] In the above technical solution, at least part of the first guide surface is arranged on the side of the first part close to the flow channel in the third direction, so that at least part of the first guide surface can form a space with the side opposite to the first die head and the second die head to limit the flow of the first slurry, thereby increasing the guiding effect of the first guide surface on the first slurry.

[0015] In some embodiments, the flow channel has a second side close to the notch in the third direction, and the second side has a second guide surface, and the second guide surface is used to guide the second slurry to move toward the notch.

[0016] In the above technical solution, the flow channel has a second side close to the notch in the third direction, and the second side has a second guide surface. The second guide surface is used to guide the second slurry to move toward the notch. When coating the cathode electrode, the second slurry moves along the second guide surface toward the notch, so that the second slurry abuts against the first slurry in the third direction, reducing the risk of bulging at the edges of the first slurry and the second slurry in the third direction due to the coffee ring effect.

[0017] In some embodiments, there are two flow channels spaced apart along the third direction, and the gap is located between the two flow channels along the third direction.

[0018] In the above technical solution, there are two flow channels spaced apart along the third direction, and the gap is located between the two flow channels along the third direction. Therefore, when the first slurry is coated, the second slurry is coated on both sides of the first slurry in the third direction. The structure is simple and easy to implement.

[0019] In some embodiments, there are a plurality of notches spaced apart along the third direction.

[0020] In the above technical solution, there are multiple gaps spaced apart along the third direction, so that when coating the cathode electrode sheets, multiple cathode electrode sheets can be coated at the same time, thereby improving the production efficiency of the cathode electrode sheets.

[0021] In some embodiments, the flow channel is located within the gasket assembly.

[0022] In the above technical solution, the flow channel is located in the gasket assembly, thereby reducing the risk of the second slurry flowing from the flow channel into the accommodating cavity and contaminating the first slurry compared to the implementation scheme in which the flow channel is located on the surface opposite to the gasket assembly and the first die head or the second die head.

[0023] In some embodiments, the gasket assembly includes a first gasket and a second gasket. Along a first direction, the first gasket has a third side facing the second gasket, and the second gasket has a fourth side facing the first gasket. The third side is recessed to form a first groove, and / or the fourth side is recessed to form a second groove. Along the first direction, the first gasket and the second gasket are stacked sequentially so that the first groove and / or the second groove form a flow channel.

[0024] In the above technical solution, the gasket assembly includes a first gasket and a second gasket. Along a first direction, the first gasket has a third side facing the second gasket, and the second gasket has a fourth side facing the first gasket. The third side is recessed to form a first groove, and / or the fourth side is recessed to form a second groove. Along the first direction, the first gasket and the second gasket are stacked in sequence so that the first groove and / or the second groove form a flow channel. Compared to integrally forming the gasket assembly and machining the flow channel within the gasket assembly, configuring the gasket assembly to include the first gasket and the second gasket is easier to manufacture, thereby reducing the manufacturing cost of the coating die.

[0025] In some embodiments, along the first direction, the first die head, the first gasket, the second gasket and the second die head are stacked in sequence, the first gasket has a first through hole for the second slurry to enter the flow channel, and the first die head has a second through hole connected to the first through hole.

[0026] In the above technical solution, the first die head, the first gasket, the second gasket and the second die head are stacked in sequence along the first direction. The first gasket has a first through hole for the second slurry to enter the flow channel, and the first die head has a second through hole connected to the first through hole, so as to facilitate the injection of the second slurry into the flow channel through the second through hole, thereby facilitating the connection between the flow channel and the second slurry source.

[0027] In a second aspect, an embodiment of the present application further provides a coating device, comprising the above-mentioned coating die head. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0029] Figure 1 An exploded view of the structure of a coating die provided in some embodiments of the present application;

[0030] Figure 2 A schematic structural diagram of a coating die provided in some embodiments of the present application;

[0031] Figure 3 A schematic structural diagram of a coating die provided in some embodiments of the present application from another perspective;

[0032] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0033] Figure 5 A schematic structural diagram of a gasket assembly provided in some embodiments of the present application;

[0034] Figure 6 An exploded view of the structure of a gasket assembly provided in some embodiments of the present application;

[0035] Figure 7 An exploded view of the structure of another coating die provided in some embodiments of the present application.

[0036] Icon: 100- coating die;

[0037] 10-die body; 10A-first accommodating cavity; 10B-first coating port; 11-first die; 12-second die;

[0038] 20 - gasket assembly; 20A - flow channel; 20B - second coating port; 20C - second guide surface; 20D - notch; 20E - first guide surface; 21 - first gasket; 21A - first groove; 21B - first positioning hole; 22 - second gasket; 22A - second groove; 22B - second positioning hole; 201 - first portion; 202 - second portion;

[0039] X-first direction; Y-second direction; Z-third direction. DETAILED DESCRIPTION

[0040] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0041] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0042] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments.

[0043] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0044] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0045] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0046] The term "plurality" used in this application refers to two or more (including two).

[0047] Pole sheet coating is a key step in the lithium battery production process, where a prepared coating slurry is evenly, continuously, or intermittently applied to a substrate (aluminum or copper foil). Coating requires consistent thickness at every coating location and is controlled within the tolerances required by the process. The quality and stability of the pole sheet coating process significantly impacts battery performance and cycle life.

[0048] Currently, there are two common coating methods in China: transfer coating and extrusion coating. Transfer coating is a mature technology, but its structure is complex and equipment commissioning is tedious. Furthermore, the slurry used in transfer coating is exposed to the air, making it difficult to guarantee the coating slurry's performance.

[0049] Extrusion coating technology is maturing, featuring a simple structure, compact equipment, and easy commissioning. Furthermore, the coating slurry within the coating head is sealed and isolated from the outside world, ensuring the quality of the coating slurry. Furthermore, extrusion coating machines offer significantly higher coating precision than traditional transfer coating machines. Current experimental results indicate that the minimum thickness limit for transfer coating is 50µm, while extrusion coating can achieve 20µm. Therefore, the use of extrusion coating machines for coating lithium-ion battery electrodes and other applications has become a growing trend.

[0050] The coating die is a key component of the coating apparatus, used to evenly apply the coating slurry to the substrate surface. The coating die typically has a cavity inside to accommodate the first slurry (the negative electrode active material). The coating die's gasket typically has a flow channel to accommodate the second slurry (the tab glue).

[0051] As an example, the negative electrode substrate can be a metal foil, a metal foam or a composite current collector. For example, as the metal foil, aluminum or stainless steel with a silver surface treatment, stainless steel, copper, aluminum, nickel, carbon electrode, nickel or titanium, etc. can be used. The metal foam can be nickel foam, copper foam, aluminum foam, alloy foam, etc. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0052] 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.

[0053] As an example, the negative electrode substrate has two surfaces facing each other in its thickness direction, and the negative electrode active material is provided on either or both of the two facing surfaces of the negative electrode substrate.

[0054] As an example, the negative electrode active material may adopt the negative electrode active material for battery cells that is well known in the art. 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, lithium titanate, etc. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0055] When coating the cathode electrode, tab glue needs to be applied on both sides of the active material slurry. Since both slurries are applied simultaneously through the same coating die, when the coating thickness of the negative electrode active material slurry is increased to improve the energy density of the battery cell, the tab glue coating thickness will also increase. This will lead to a thicker tab glue on the cathode electrode, increasing the risk of redundant cathode tabs.

[0056] Based on the above considerations, in order to solve the problem that when the coating thickness of the slurry of the negative active material is thick, the coating thickness of the tab glue is also thick, which in turn leads to a large thickness of the tab glue on the cathode electrode, increasing the risk of cathode tab redundancy, an embodiment of the present application provides a coating die including a die body and a gasket assembly. The die body includes a first die and a second die stacked along a first direction, and the first die and the second die enclose a first accommodating cavity for accommodating the first slurry. The gasket assembly has a first part located between the first die and the second die along the first direction, and the first part and the side opposite to the first die and the second die enclose a first coating port connected to the first accommodating cavity, and the gasket assembly has a flow channel for accommodating the second slurry. Wherein, the gasket assembly has a second part protruding from the die body along the second direction, and the second part has a second coating port connected to the flow channel, and the first direction is perpendicular to the second direction.

[0057] In a coating die of this structure, the first part of the gasket assembly is enclosed with the sides opposite to the first die and the second die to form a first coating port connected to the first accommodating cavity, and the second part of the gasket assembly protrudes from the die body along the second direction and has a second coating port connected to the flow channel, so that along the second direction, the distance between the second coating port and the substrate is smaller than the distance between the first coating port and the substrate, so that when coating the cathode electrode, the thickness of the second slurry that can be accommodated between the substrate and the second coating port is smaller than the thickness of the first slurry that can be accommodated between the substrate and the first coating port, thereby reducing the thickness of the tab glue on the cathode electrode and reducing the risk of cathode tab redundancy.

[0058] The specific structure of the coating die head is described in detail below with reference to the accompanying drawings.

[0059] Please refer to Figure 1 、 Figure 2 and Figure 3 , Figure 1 This is an exploded view of the coating die head 100 provided in some embodiments of the present application. Figure 2 This is a schematic structural diagram of a coating die head 100 provided in some embodiments of the present application. Figure 3A schematic structural diagram of a coating die 100 provided in some embodiments of the present application from another perspective. The embodiment of the present application provides a coating die 100 including a die body 10 and a gasket assembly 20. The die body 10 includes a first die 11 and a second die 12 stacked along a first direction X, and the first die 11 and the second die 12 enclose a first accommodating cavity 10A for accommodating a first slurry. The gasket assembly 20 has a first portion 201 located between the first die 11 and the second die 12 along the first direction X, and the first portion 201 and the side opposite to the first die 11 and the second die 12 enclose a first coating port 10B connected to the first accommodating cavity 10A, and the gasket assembly 20 has a flow channel 20A for accommodating a second slurry. The gasket assembly 20 has a second portion 202 protruding from the die body 10 along the second direction Y, and the second portion 202 has a second coating port 20B connected to the flow channel 20A, and the first direction X is perpendicular to the second direction Y.

[0060] The die body 10 is a portion of the coating die 100 for uniformly coating the coating slurry on the surface of the substrate.

[0061] The first direction X is the direction in which the first die head 11 and the second die head 12 are stacked, and the second direction Y and the third direction Z are directions perpendicular to the first direction X. For example, the first direction X may be parallel to the height direction of the die body 10, the second direction Y may be parallel to the width direction of the die body 10, and the third direction Z may be parallel to the length direction of the die body 10.

[0062] The first die 11 and the second die 12 are main parts of the die body 10 .

[0063] It can be understood that the first die 11 and the second die 12 are generally metal parts to have high strength and rigidity, thereby reducing the risk of deformation of the die body 10 when the pressure in the first accommodating cavity 10A is too high.

[0064] For example, the first die head 11 and the second die head 12 may be connected by screws, or the first die head 11 and the second die head 12 may be connected by snap fasteners, or the first die head 11 and the second die head 12 may be clamped by a fixture.

[0065] The first die head 11 and the second die head 12 together form a first accommodating cavity 10A for accommodating the first slurry. This can be understood as the first accommodating cavity 10A being formed by the opposing sides of the first die head 11 and the second die head 12. For example, the side of one of the first die head 11 and the second die head 12 facing the other is recessed to form a groove, and the groove and the side of the other die head facing the groove together form the first accommodating cavity 10A.

[0066] If the groove is set on the side of the first die head 11 facing the second die head 12, the groove and the side of the second die head 12 facing the first die head 11 together form a first accommodating cavity 10A; if the groove is set on the side of the second die head 12 facing the first die head 11, the groove and the side of the first die head 11 facing the second die head 12 together form a first accommodating cavity 10A.

[0067] Taking the first accommodating cavity 10A provided in the first die head 11 as an example, refer to Figure 1 Along the first direction X, the side of the first die head 11 facing the second die head 12 is recessed to form a groove, and the side of the second die head 12 facing the first die head 11 is flat. The second die head 12 covers the notch of the groove to form the first accommodating cavity 10A. Therefore, only one of the first die head 11 and the second die head 12 needs to be grooved, which is easier to manufacture than grooves in both the first die head 11 and the second die head 12, thereby reducing the manufacturing cost of the coating die head 100.

[0068] It can be understood that the first die head 11 or the second die head 12 may have an inlet (not shown in the figure) connected to the first accommodating cavity 10A, and the inlet (not shown in the figure) is used to allow the first slurry to enter the first accommodating cavity 10A.

[0069] The shim assembly 20 is a component provided between the first die 11 and the second die 12 to form a first coating port 10B between the first die 11 and the second die 12 .

[0070] The flow channel 20A is a structure of the coating die 100 for accommodating the second slurry. For example, the flow channel 20A can be provided in a channel in the gasket assembly 20, or can be a groove-shaped structure provided on one side of the gasket assembly 20 in the first direction X. In order to facilitate the display of the range of the flow channel 20A, please refer to Figure 1 and Figure 3 In the figure, the range of the flow channel 20A is marked with a dotted line. It should be noted that the dotted line is only for the convenience of showing the range of the flow channel 20A and does not represent any entity meaning.

[0071] The first portion 201 is a portion of the gasket assembly 20 located between the first die 11 and the second die 12 along the first direction X. For example, on a projection plane perpendicular to the first direction X, the orthographic projection of the first portion 201 completely falls within the orthographic projections of the first die 11 and the second die 12.

[0072] The first coating port 10B is an opening formed by the first portion 201 , the first die head 11 , and the second die head 12 for allowing the first slurry to leave the first accommodating cavity 10A.

[0073] The second portion 202 is a portion of the gasket assembly 20 that protrudes from the first die 11 and the second die 12 along the second direction Y. For example, on a projection plane perpendicular to the first direction X, the orthographic projection of the second portion 202 does not fall within the orthographic projections of the first die 11 and the second die 12.

[0074] The second coating port 20B is an opening provided in the second portion 202 and communicated with the flow channel 20A, so as to allow the second slurry to leave the flow channel 20A.

[0075] In some embodiments, the portion of the flow channel 20A located at the second portion 202 extends along the second direction Y, and the second coating port 20B is disposed on a side of the gasket assembly 20 located outside the die body 10 in the second direction Y.

[0076] In this embodiment, the first part 201 of the gasket assembly 20 is enclosed with the sides opposite to the first die 11 and the second die 12 to form a first coating port 10B connected to the first accommodating cavity 10A, and the second part 202 of the gasket assembly 20 protrudes from the die body 10 along the second direction Y, and has a second coating port 20B connected to the flow channel 20A, so that along the second direction Y, the distance between the second coating port 20B and the substrate is smaller than the distance between the first coating port 10B and the substrate, so that when coating the cathode electrode, the thickness of the second slurry that can be accommodated between the substrate and the second coating port 20B is smaller than the thickness of the first slurry that can be accommodated between the substrate and the first coating port 10B, thereby reducing the thickness of the tab glue on the cathode electrode and reducing the risk of cathode tab redundancy.

[0077] According to some embodiments of the present application, referring to Figure 1 、 Figure 2 and Figure 3 The gasket assembly 20 is recessed on one side in the second direction Y to form a notch 20D. The portion of the notch 20D located within the first portion 201 and the side surfaces opposite to the first die 11 and the second die 12 form a first coating port 10B.

[0078] In some embodiments, the notch 20D on the gasket assembly 20 can be made simultaneously with the gasket assembly 20 using an one-piece molding processing method such as casting, so that the gasket assembly 20 with the notch 20D can be manufactured as a whole simultaneously, which not only makes the processing and manufacturing of the gasket assembly 20 convenient, but also makes the overall structure of the gasket assembly 20 have good strength; the notch 20D can also be made by using mechanical processing methods such as milling, by processing the entire blank of the gasket assembly 20, so that the gasket assembly 20 has lower processing difficulty and processing cost.

[0079] It is understood that the length of the gap 20D in the third direction Z should be adapted to the width of the first slurry to be coated on the substrate. Figure 3 In the figure, the range of the gap 20D is marked with a dotted line. It should be noted that the dotted line is only for the convenience of showing the range of the gap 20D and does not represent any entity meaning.

[0080] In this embodiment, by clamping the gasket assembly 20 between the first die head 11 and the second die head 12, and connecting the notch 20D on the gasket assembly 20 with the accommodating cavity, the gasket assembly 20, the first die head 11 and the second die head 12 can form a first coating port 10B connected with the accommodating cavity and the outside world, so that the first slurry in the accommodating cavity can flow into the notch 20D and flow out to the outside world for coating. The structure is simple and easy to implement.

[0081] According to some embodiments of the present application, referring to Figure 1 、 Figure 2 and Figure 3 , and please refer to Figure 4 , Figure 4 for Figure 3 In the enlarged view of point A, the notch 20D and the second coating port 20B are spaced apart along the third direction Z, and the first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0082] In this embodiment, the notch 20D and the second coating port 20B are spaced apart along the third direction Z. When coating the cathode electrode, the second slurry flowing out of the second coating port 20B is located on the side of the first slurry flowing out of the notch 20D in the third direction Z, thereby reducing the risk of the first slurry and the second slurry being mixed when coating the substrate at the same position in the third direction Z.

[0083] According to some embodiments of the present application, referring to Figure 3 and Figure 4 The notch 20D has a first side close to the flow channel 20A in the third direction Z. The first side has a first guide surface 20E. The first guide surface 20E is used to guide the first slurry to move toward the second coating port 20B.

[0084] The first side is the side of the notch 20D close to the flow channel 20A along the third direction Z. In an embodiment where there are two flow channels 20A, and the two flow channels 20A are respectively arranged on both sides of the notch 20D in the third direction Z, the first side is the two side surfaces of the notch 20D arranged oppositely in the third direction Z.

[0085] The first guide surface 20E is a surface provided on the first side for guiding the first slurry to move toward the second coating port 20B. For example, as the distance between the first guide surface 20E and the flow channel 20A in the third direction Z gradually decreases along the second direction Y away from the first cavity. Figure 3and Figure 4 In the figure, the range of the first guide surface 20E is marked with a dotted line. It should be noted that the dotted line is only for the convenience of showing the range of the first guide surface 20E and does not represent any entity meaning.

[0086] The first guide surface 20E may be a curved surface or a flat surface.

[0087] In this embodiment, the notch 20D has a first side close to the flow channel 20A in the third direction Z, and the first side has a first guide surface 20E. The first guide surface 20E is used to guide the first slurry to move toward the second coating port 20B. When coating the cathode electrode, the first slurry moves along the first guide surface 20E toward the second coating port 20B, thereby making the first slurry abut against the second slurry in the third direction Z, reducing the risk of bulging at the edges of the first slurry and the second slurry in the third direction Z due to the coffee ring effect.

[0088] According to some embodiments of the present application, referring to Figure 3 and Figure 4 , at least a portion of the first guide surface 20E is disposed on the first portion 201 .

[0089] At least a portion of the first guide surface 20E is disposed on the first portion 201, which can be understood as at least a portion of the first guide surface 20E being located between the first die 11 and the second die 12 along the first direction X, thereby enabling the relative sides of the first die 11 and the second die 12 to limit the movement of the first slurry in the first direction X, thereby enabling the first slurry to move along the first guide direction close to the second coating port 20B.

[0090] In this embodiment, at least a portion of the first guide surface 20E is disposed on a side of the first portion 201 close to the flow channel 20A in the third direction Z, so that at least a portion of the first guide surface 20E can form a space with the side opposite to the first die head 11 and the second die head 12 to limit the flow of the first slurry, thereby increasing the guiding effect of the first guide surface 20E on the first slurry.

[0091] According to some embodiments of the present application, referring to Figure 3 and Figure 4 The flow channel 20A has a second side close to the notch 20D in the third direction Z, and the second side has a second guide surface 20C, and the second guide surface 20C is used to guide the second slurry to move toward the direction close to the notch 20D.

[0092] The second side is a side of the flow channel 20A close to the notch 20D along the third direction Z.

[0093] The second guide surface 20C is a surface provided on the second side for guiding the second slurry to move toward the notch 20D. For example, as the distance between the second guide surface 20C and the notch 20D in the third direction Z gradually decreases along the second direction Y away from the first cavity. Figure 3 and Figure 4 In the figure, the range of the second guide surface 20C is marked with a dotted line. It should be noted that the dotted line is only for the convenience of showing the range of the second guide surface 20C and does not represent any entity meaning.

[0094] The second guide surface 20C may be a curved surface or a flat surface.

[0095] In this embodiment, the flow channel 20A has a second side close to the notch 20D in the third direction Z, and the second side has a second guide surface 20C. The second guide surface 20C is used to guide the second slurry to move toward the notch 20D. When coating the cathode electrode, the second slurry moves along the second guide surface 20C toward the notch 20D, thereby making the second slurry abut against the first slurry in the third direction Z, reducing the risk of bulging at the edges of the first and second slurries in the third direction Z due to the coffee ring effect.

[0096] According to some embodiments of the present application, referring to Figure 5 , Figure 5 Schematic diagram of the structure of the gasket assembly 20 provided in some embodiments of the present application. The flow channels 20A are arranged in two intervals along the third direction Z, and the gap 20D is located between the two flow channels 20A along the third direction Z.

[0097] To facilitate the display of the range of flow channel 20A, please refer to Figure 5 In the figure, the range of the flow channel 20A is marked with a dotted line. It should be noted that the dotted line is only for the convenience of showing the range of the flow channel 20A and does not represent any entity meaning.

[0098] In this embodiment, there are two flow channels 20A spaced apart along the third direction Z. Along the third direction Z, the gap 20D is located between the two flow channels 20A. Therefore, when the first slurry is coated, the second slurry is coated on both sides of the first slurry in the third direction Z. The structure is simple and easy to implement.

[0099] According to some embodiments of the present application, referring to Figure 5 The notches 20D are multiple and spaced apart along the third direction Z.

[0100] A plurality of notches 20D are provided on the gasket assembly 20 at intervals along the third direction Z. The notches 20D are provided along the thickness direction of the gasket assembly 20 and are connected to the edge of the gasket assembly 20. For example, by clamping the gasket assembly 20 between the first die 11 and the second die 12, and connecting the notches 20D on the gasket assembly 20 with the first accommodating cavity 10A, the gasket assembly 20, the first die 11 and the second die 12 can form a plurality of first coating ports 10B connecting the first accommodating cavity 10A and the outside world, so that the slurry in the first accommodating cavity 10A can flow out to the outside world by flowing into the notches 20D for coating.

[0101] In this embodiment, a plurality of notches 20D are arranged at intervals along the third direction Z, so that when coating the cathode electrode sheets, multiple cathode electrode sheets can be coated at the same time, thereby improving the production efficiency of the cathode electrode sheets.

[0102] According to some embodiments of the present application, referring to Figure 5 , the flow channel 20A is located in the gasket assembly 20.

[0103] It can be understood that when the flow channel 20A is located in the gasket assembly 20, the flow channel 20A does not need to avoid the mechanical structure (such as the detection hole of the probe) on the die body 10, which reduces the design difficulty of the flow channel 20A.

[0104] In this embodiment, the flow channel 20A is located in the gasket assembly 20, thereby reducing the risk of the second slurry flowing from the flow channel 20A into the accommodating cavity and contaminating the first slurry compared to the implementation in which the flow channel 20A is located on the surface of the gasket assembly 20 opposite to the first die head 11 or the second die head 12.

[0105] According to some embodiments of the present application, referring to Figure 6 , Figure 6 An exploded view of the structure of a gasket assembly 20 provided in some embodiments of the present application. The gasket assembly 20 includes a first gasket 21 and a second gasket 22. Along a first direction X, the first gasket 21 has a third side facing the second gasket 22, and the second gasket 22 has a fourth side facing the first gasket 21. The third side is recessed to form a first groove 21A, and / or the fourth side is recessed to form a second groove 22A. Along the first direction X, the first gasket 21 and the second gasket 22 are stacked in sequence, so that the first groove 21A and / or the second groove 22A form a flow channel 20A.

[0106] The first gasket 21 and the second gasket 22 are two main parts of the gasket assembly 20 .

[0107] It is understandable that the first gasket 21 and the second gasket 22 are generally metal parts to have high strength and rigidity, thereby reducing the risk of deformation of the gasket assembly 20 when the pressure in the flow channel 20A is too high.

[0108] For example, the first gasket 21 and the second gasket 22 may be connected by screws, or the first die head 11 and the second die head 12 may be clamped by a first die head 11 and a second die head 12 clamp.

[0109] The third side is a side of the first gasket 21 facing the second gasket 22 along the first direction X.

[0110] In some embodiments, the first groove 21A on the first gasket 21 can be made synchronously with the first gasket 21 using an one-piece molding processing method such as casting, so that the first gasket 21 with the first groove 21A can be manufactured as a whole synchronously, which not only makes the processing and manufacturing of the first gasket 21 convenient, but also makes the overall structure of the first gasket 21 have good strength; the first groove 21A can also be made by using mechanical processing methods such as milling, by processing the entire blank of the first gasket 21, so that the first gasket 21 has lower processing difficulty and processing cost.

[0111] The fourth side is a side of the second gasket 22 facing the first gasket 21 along the first direction X.

[0112] In some embodiments, the second groove 22A on the second gasket 22 can be made synchronously with the second gasket 22 using an one-piece molding processing method such as casting, so that the second gasket 22 with the second groove 22A can be manufactured as a whole synchronously, which not only makes the processing and manufacturing of the second gasket 22 convenient, but also makes the overall structure of the second gasket 22 have good strength; the second groove 22A can also be made by using mechanical processing methods such as milling, by processing the entire blank of the second gasket 22, so that the second gasket 22 has lower processing difficulty and processing cost.

[0113] Along the first direction X, the first gasket 21 and the second gasket 22 are stacked in sequence so that the first groove 21A and / or the second groove 22A form a flow channel 20A. It can be understood that the third side has a first groove 21A, and along the first direction X, the first gasket 21 and the second gasket 22 are stacked in sequence so that the first groove 21A and the fourth side are enclosed to form the flow channel 20A; it can also be understood that the fourth side has a second groove 22A, and along the first direction X, the first gasket 21 and the second gasket 22 are stacked in sequence so that the second groove 22A and the third side are enclosed to form the flow channel 20A; it can also be understood that the third side has a first groove 21A, and the fourth side has a second groove 22A, and along the first direction X, the first gasket 21 and the second gasket 22 are stacked in sequence so that the first groove 21A and the second groove 22A are enclosed to form the flow channel 20A.

[0114] In some embodiments, the first gasket 21 is symmetrically arranged relative to the centerline of the first gasket 21, and the first groove 21A is symmetrically arranged relative to the centerline of the first gasket 21. The centerline of the first gasket 21 refers to a straight line parallel to the second direction Y and passing through the geometric midpoint of the first gasket 21. The second gasket 22 is symmetrically arranged relative to the centerline of the second gasket 22, and the second groove 22A is symmetrically arranged relative to the centerline of the second gasket 22. The centerline of the second gasket 22 refers to a straight line parallel to the second direction Y and passing through the geometric midpoint of the second gasket 22. As a result, when the first gasket 21 and the second gasket 22 are processed by processes such as turning and milling, the same processing device can be used to process the first gasket 21 and the second gasket 22, thereby reducing the error between the first gasket 21 and the second gasket 22. This reduces the risk of the second slurry entering the first receiving chamber 10A and contaminating the first slurry due to a gap between the first gasket 21 and the second gasket 22.

[0115] In this embodiment, the gasket assembly 20 includes a first gasket 21 and a second gasket 22. Along a first direction X, the first gasket 21 has a third side facing the second gasket 22, and the second gasket 22 has a fourth side facing the first gasket 21. The third side is recessed to form a first groove 21A, and / or the fourth side is recessed to form a second groove 22A. Along the first direction X, the first gasket 21 and the second gasket 22 are stacked in sequence such that the first groove 21A and / or the second groove 22A form a flow channel 20A. Compared to integrally forming the gasket assembly 20 and machining the flow channel 20A within the gasket assembly 20, configuring the gasket assembly 20 to include the first gasket 21 and the second gasket 22 is easier to manufacture, thereby reducing the manufacturing cost of the coating die 100.

[0116] According to some embodiments of the present application, referring to Figure 6 and Figure 7 , Figure 7 This is an exploded view of the structure of another coating die 100 provided in some embodiments of the present application. Along a first direction X, a first die 11, a first gasket 21, a second gasket 22, and a second die 12 are stacked in sequence. The first gasket 21 has a first through hole for the second slurry to enter the flow channel 20A, and the first die 11 has a second through hole connected to the first through hole.

[0117] In some embodiments, the first gasket 21 is provided with a first positioning hole 21B, the second gasket 22 is provided with a second positioning hole 22B corresponding to the first positioning hole 21B, one of the first die 11 and the second die 12 is provided with a positioning pin (not shown in the figure), and the other is provided with a third positioning hole (not shown in the figure) for accommodating the positioning pin (not shown in the figure), and two first positioning holes 21B are arranged at intervals along the third direction Z. The positioning pin (not shown in the figure) passes through the first positioning hole 21B and the second positioning hole 22B and is inserted into the third positioning hole (not shown in the figure) to limit the movement of the first gasket 21 and the second gasket 22 in a direction perpendicular to the first direction X relative to the die body 10.

[0118] The first through hole (not shown in the figure) is a through hole that passes through the first gasket 21 along the thickness direction of the first gasket 21 to communicate with the flow channel 20A. The first through hole (not shown in the figure) on the first gasket 21 can be made synchronously with the first gasket 21 by an integrated molding processing method such as casting, so that the first gasket 21 with the first through hole (not shown in the figure) can be manufactured as a whole synchronously, which not only makes the processing and manufacturing of the first gasket 21 convenient, but also makes the overall structure of the first gasket 21 have good strength; the first through hole (not shown in the figure) can also be made by machining the entire blank of the first gasket 21 by milling and other mechanical processing methods, so that the first gasket 21 has lower processing difficulty and processing cost.

[0119] The second through hole (not shown in the figure) is provided on the first die head 11 and is corresponding to the first through hole (not shown in the figure). One end of the second through hole (not shown in the figure) is connected to the first through hole (not shown in the figure), and the other end of the second through hole can be connected to the second slurry source through a connecting pipe.

[0120] In this embodiment, along the first direction X, the first die head 11, the first gasket 21, the second gasket 22 and the second die head 12 are stacked in sequence, the first gasket 21 has a first through hole for the second slurry to enter the flow channel 20A, and the first die head 11 has a second through hole connected to the first through hole, thereby facilitating the injection of the second slurry into the flow channel 20A through the second through hole, thereby facilitating the connection between the flow channel 20A and the second slurry source.

[0121] The embodiment of the present application further provides a coating device, comprising the above-mentioned coating die head 100 .

[0122] According to some embodiments of the present application, see Figures 1 to 7As shown, the present application provides a coating die 100 including a die body 10 and a gasket assembly 20. The die body 10 includes a first die 11 and a second die 12 stacked along a first direction X, and the first die 11 and the second die 12 enclose a first accommodating cavity 10A for accommodating a first slurry. The gasket assembly 20 has a first portion 201 located between the first die 11 and the second die 12 along the first direction X, and the first portion 201 and the side opposite to the first die 11 and the second die 12 enclose a first coating port 10B connected to the first accommodating cavity 10A, and the gasket assembly 20 has a flow channel 20A for accommodating a second slurry. The gasket assembly 20 has a second portion 202 protruding from the die body 10 along the second direction Y, and the second portion 202 has a second coating port 20B connected to the flow channel 20A.

[0123] One side of the gasket assembly 20 in the second direction Y is recessed to form a notch 20D. The portion of the notch 20D located within the first portion 201 and the opposing sides of the first die head 11 and the second die head 12 enclose a first coating port 10B. The notch 20D and the second coating port 20B are spaced apart along the third direction Z. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0124] The notch 20D has a first side in the third direction Z that is close to the flow channel 20A. The first side has a first guide surface 20E. The first guide surface 20E is used to guide the first slurry toward the second coating port 20B. At least a portion of the first guide surface 20E is disposed on a side of the first portion 201 in the third direction Z that is close to the flow channel 20A.

[0125] The flow channel 20A has a second side close to the notch 20D in the third direction Z. The second side has a second guide surface 20C. The second guide surface 20C is used to guide the second slurry to move toward the notch 20D.

[0126] There are two flow channels 20A spaced apart along the third direction Z. Any notch 20D is located between two flow channels 20A along the third direction Z. There are multiple notches 20D spaced apart along the third direction Z. There are multiple pairs of flow channels 20A corresponding to the notches 20D.

[0127] The flow channel 20A is located within the gasket assembly 20 .

[0128] The gasket assembly 20 includes a first gasket 21 and a second gasket 22. Along the first direction X, the first gasket 21 has a third side facing the second gasket 22, and the second gasket 22 has a fourth side facing the first gasket 21. The third side is recessed to form a first groove 21A, and / or the fourth side is recessed to form a second groove 22A. Along the first direction X, the first gasket 21 and the second gasket 22 are stacked in sequence so that the first groove 21A and / or the second groove 22A form a flow channel 20A. 。

[0129] Along the first direction X, the first die head 11, the first gasket 21, the second gasket 22 and the second die head 12 are stacked in sequence. The first gasket 21 has a first through hole for the second slurry to enter the flow channel 20A, and the first die head 11 has a second through hole connected to the first through hole.

[0130] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0131] The above embodiments are intended only to illustrate the technical solutions of this application and are not intended to limit this application. Those skilled in the art will appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this application are intended to be within the scope of protection of this application.

Claims

1. A coating die head, characterized in that, include: The die body comprises a first die and a second die stacked in a first direction, wherein the first die and the second die together form a first accommodating cavity for accommodating the first slurry; a gasket assembly having a first portion located between the first die head and the second die head along the first direction, the first portion and opposite sides of the first die head and the second die head enclosing a first coating port communicating with the first accommodating cavity, the gasket assembly having a flow channel for accommodating the second slurry; The gasket assembly has a second portion protruding from the die body along a second direction, the second portion has a second coating port communicating with the flow channel, and the first direction is perpendicular to the second direction.

2. The coating die head according to claim 1, wherein One side of the gasket assembly in the second direction is recessed to form a notch, and a portion of the notch located within the first portion is enclosed by opposite sides of the first die head and the second die head to form the first coating port.

3. The coating die head according to claim 2, wherein The notch and the second coating port are spaced apart along a third direction, and the first direction, the second direction and the third direction are perpendicular to each other.

4. The coating die head according to claim 3, wherein The notch has a first side close to the flow channel in the third direction, and the first side has a first guide surface, and the first guide surface is used to guide the first slurry to move toward the second coating port.

5. The coating die head according to claim 4, wherein At least a portion of the first guide surface is disposed on the first portion.

6. The coating die head according to claim 3, wherein The flow channel has a second side close to the notch in the third direction, and the second side has a second guide surface, and the second guide surface is used to guide the second slurry to move toward the notch.

7. The coating die head according to claim 3, wherein There are two flow channels spaced apart along the third direction, and the gap is located between the two flow channels along the third direction.

8. The coating die head according to claim 7, wherein There are a plurality of notches arranged at intervals along the third direction.

9. The coating die head according to claim 1, wherein The flow channel is located within the gasket assembly.

10. The coating die head according to claim 9, wherein The gasket assembly includes a first gasket and a second gasket, wherein along the first direction, the first gasket has a third side facing the second gasket, and the second gasket has a fourth side facing the first gasket, the third side is recessed to form a first groove, and / or the fourth side is recessed to form a second groove; Along the first direction, the first gasket and the second gasket are stacked in sequence, so that the first groove and / or the second groove form the flow channel.

11. The coating die head according to claim 10, wherein Along the first direction, the first die head, the first gasket, the second gasket and the second die head are stacked in sequence, the first gasket has a first through hole for the second slurry to enter the flow channel, and the first die head has a second through hole connected to the first through hole.

12. A coating device, characterized in that: The coating die comprises the coating die according to any one of claims 1 to 11.

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