Coating die, and coating device for battery electrode sheet

Abstract

A coating die, and a coating device for a battery electrode sheet. The coating die comprises a first die (1) and a second die (2). The first die (1) comprises a first main body (11) and a first component (12), and the first component (12) is detachably connected to the first main body (11). The second die (2) and the first die (1) are arranged in a first direction (Z), a cavity (3) used for accommodating a slurry is formed between the second die (2) and the first main body (11), and a discharging port (4) communicated with the cavity (3) is formed between the first component (12) and the second die (2). When the first component is worn, the worn first component only needs to be detached and a new first component is mounted, so that the downtime of the coating die can be shortened, improving the coating efficiency, and reducing the production costs.

Description

Coating die and battery electrode coating device

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 202410002121.3, filed on January 2, 2024, entitled “Coating die and coating device for battery pole piece,” the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application relates to the field of coating technology, and in particular to a coating die head and a coating device for battery pole pieces. Background Art

[0004] Coating is an essential process in battery production and a key step that directly impacts battery performance, including yield and lifespan. Coating involves applying a prepared, viscous, paste-like slurry evenly, continuously, or intermittently to a substrate (aluminum or copper foil). Improving coating efficiency has long been a key research topic within the industry.

[0005] Summary of the Invention

[0006] The present application provides a coating die head and a coating device for battery pole pieces, which can improve coating efficiency.

[0007] In a first aspect, the present application provides a coating die head, comprising a first die head and a second die head. The first die head comprises a first body and a first component, the first component being detachably connected to the first body. The second die head is arranged along a first direction with the first die head, a cavity for accommodating a slurry is formed between the second die head and the first body, and a discharge port connected to the cavity is formed between the first component and the second die head.

[0008] When the first component becomes worn, simply remove it and replace it with a new one. This reduces coating die downtime, improves coating efficiency, and reduces production costs. The worn first component can be repaired and reused separately, extending its service life.

[0009] In some embodiments, the coating die head further comprises a first fixing member, which is movably disposed on the first body along a first direction. In the first direction, a portion of the first component is clamped between the first fixing member and the first body.

[0010] The first fixing member and the first body can clamp the first component from both sides in a first direction, thereby securing the first component to the first body. When the first component needs to be replaced, the first fixing member can be moved along the first direction to release the first fixing member from its restraint on the first component. The compression assembly facilitates disassembly and installation.

[0011] In some embodiments, the first fixing member is threadedly connected to the first body, and the first fixing member can be rotated to adjust the pressure applied by the first fixing member to the first component. By rotating the first fixing member, the first component can be tightened or loosened on the first body, thereby facilitating removal and installation of the first component.

[0012] In some embodiments, a limiting recess is provided on a side of the first component facing the first fixing member along the first direction, and the first fixing member abuts against a bottom surface of the limiting recess.

[0013] A portion of the first fixing member extends into the limiting recess, which can also limit the first component in other directions intersecting with the first direction, thereby improving the stability of the first component and improving the consistency of the coating weight.

[0014] In some embodiments, a first recess is provided on one side of the first body along a second direction intersecting the first direction. A portion of the first component is accommodated in the first recess. When the first component is installed, the first recess can position the first component, thereby simplifying the assembly process.

[0015] In some embodiments, the first body includes a first convex portion and a second convex portion arranged along a first direction, the first concave portion is arranged between the first convex portion and the second convex portion, and the first convex portion is located on a side of the second convex portion closer to the second die head. The coating die head also includes a first fixing member that is movably connected to the second convex portion along the first direction and is used to press the first component.

[0016] The first and second protrusions can limit the first component from both sides in the first direction, thereby improving the stability of the first component, reducing vibration of the first component, and improving the consistency of the coating weight. The first fixing member and the first protrusion can clamp the first component from both sides to achieve the first component fixation. The first component can also be loosened by moving the first fixing member.

[0017] In some embodiments, the coating die head further comprises at least one adjusting piece disposed on the first concave portion. In the first direction, the adjusting piece is disposed between the first convex portion and the first component.

[0018] When the first component is worn, the surface of the first component facing the second die head needs to be ground. After grinding, the size of the first component along the first direction is reduced. If the first component remains in place, the distance between the first component and the second die head along the first direction increases, and the discharge port also increases. In the embodiment of the present application, by removing the adjustment plate, the first component can be moved as a whole toward the second die head to compensate for the dimensional loss of the first component after grinding, maintaining a constant distance between the first component and the second die head along the first direction.

[0019] In some embodiments, the thickness of the adjustment sheet is 20 μm-30 μm. The smaller thickness of the adjustment sheet can reduce the amount of grinding required for the first component in a single operation, lower the grinding difficulty, and increase the number of times the first component can be recycled.

[0020] In some embodiments, the first component is disposed on a side of the first body along a second direction, the second direction intersecting the first direction. The first component is provided with a second recess on a side facing the first body along the second direction, the first body includes a first protrusion received in the second recess, and the first protrusion is fixed to the first component.

[0021] When the first component is installed, the second concave portion can cooperate with the first convex portion, thereby achieving the positioning of the first component and simplifying the assembly process. In addition, the first convex portion can also be used to achieve the fixation of the first component.

[0022] In some embodiments, the coating die head further comprises a first fixing member and at least one adjusting piece, wherein the adjusting piece is accommodated in the second recess. In the first direction, the first fixing member is located on a side of the first component facing away from the first protrusion and is used to press the first component, and the adjusting piece is disposed between the first component and the first protrusion.

[0023] In some embodiments, the first component includes a first surface facing the second die head, with a discharge port formed between the first surface and the second die head. The second concave portion extends along the first direction to the first surface. The first convex portion includes a second surface facing the second die head, with the first surface and the second surface being flush.

[0024] The first surface is flush with the second surface, allowing slurry flowing along the second surface to flow smoothly into the first surface, thereby reducing resistance to slurry flow. The second recess extends to the first surface, reducing the area of ​​the first surface. The smaller first surface area is easier to fine-grind, thereby reducing the roughness of the first surface, reducing the friction coefficient of the first surface, and reducing the friction between the first surface and the slurry, thereby improving the wear resistance of the first surface.

[0025] In some embodiments, the first component further includes a first side surface and a second side surface defining a second concave portion, the second side surface being located on a side of the first convex portion away from the second die head, and the first side surface connecting the second side surface and the first surface. In the second direction, the first convex portion abuts against the first side surface to reduce the risk of slurry entering between the first convex portion and the first side surface.

[0026] In some embodiments, the first component has a first end portion at one end thereof away from the first body in the second direction, wherein a cross section of the first end portion perpendicular to the second direction gradually decreases in a direction away from the first body.

[0027] When the outer end surface of the first end portion away from the first body is worn, the first end portion can be ground to restore the flatness of the outer end surface. In the embodiment of the present application, the outer end surface has a smaller area, which can reduce the difficulty of grinding.

[0028] In some embodiments, the first die head includes a plurality of first components arranged along a third direction, the third direction being perpendicular to the first direction. Adjacent first components abut and connect along the third direction. Embodiments of the present application can reduce the length of a single first component and reduce the difficulty of molding the first components.

[0029] In some embodiments, the surface hardness of the first component is higher than that of the first body. Compared with the first body, the first component has a higher surface hardness and is more wear-resistant, thereby extending the service life of the first component and reducing the frequency of replacement of the first component.

[0030] In some embodiments, the surface hardness of the first component is 30HRC-70HRC. The first component is more wear-resistant, thereby extending the service life of the first component and reducing the frequency of replacing the first component.

[0031] In some embodiments, the first component includes a substrate and a protective layer disposed on an outer surface of the substrate, wherein at least a portion of the protective layer is located on a side of the substrate facing the second die head, and the surface hardness of the protective layer is higher than that of the substrate.

[0032] By providing a protective layer with a higher surface hardness, the first component can be made more wear-resistant, thereby extending the service life of the first component and reducing the frequency of replacement of the first component. The substrate can have a relatively low surface hardness, which allows for greater flexibility in the selection of substrate materials, thereby reducing the cost of the first component.

[0033] In some embodiments, the material of the base is the same as that of the first body. This embodiment of the application can reduce the number of material types and reduce costs.

[0034] In some embodiments, the protective layer includes a diamond-like coating or a nanocomposite coating. Both the diamond-like coating and the nanocomposite coating have relatively high surface hardness.

[0035] In some embodiments, the material of the first component includes at least one of cast stone, alumina ceramics, silicon carbide ceramics, zirconia ceramics, engineering polymer plastics, wear-resistant rubber, stainless steel with a diamond-like coating on the surface, or stainless steel with a nano-composite coating on the outer surface.

[0036] Materials such as cast stone, alumina ceramics, silicon carbide ceramics, zirconia ceramics, engineering polymer plastics, and wear-resistant rubber are insulating. The first component made of these materials is not easily electrochemically corroded by the slurry, thereby slowing down the wear of the first component, extending the service life of the first component, and reducing the frequency of replacement of the first component.

[0037] Materials such as cast stone, alumina ceramics, silicon carbide ceramics, zirconia ceramics, stainless steel with a diamond-like coating on the surface, and stainless steel with a nano-composite coating on the outer surface have high surface hardness and strong wear resistance, and can withstand the impact and friction of slurry particles; the first component made of these materials is not easy to wear, thereby extending the service life of the first component and reducing the frequency of replacement of the first component.

[0038] In some embodiments, the second die head includes a second body and a second component, the second body and the first body are arranged along the first direction and are used to define the mold cavity, and the second component and the first component are arranged along the first direction and are used to define the discharge port.

[0039] In a second aspect, the present application provides a coating device for a battery electrode, which includes the coating die provided by any of the aforementioned embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The features, advantages and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

[0041] FIG1 is a schematic structural diagram of a coating die provided in some embodiments of the present application;

[0042] FIG2 is a rear view schematic diagram of a coating die provided in some embodiments of the present application;

[0043] FIG3 is an enlarged schematic diagram of the coating die head shown in FIG1 at the circular frame;

[0044] FIG4 is a schematic cross-sectional view of the coating die head shown in FIG2 taken along the AA direction;

[0045] FIG5 is an enlarged schematic diagram of the circle frame of FIG4;

[0046] FIG6 is a schematic diagram of a first component of a coating die provided in some embodiments of the present application;

[0047] FIG7 is a partial cross-sectional schematic diagram of a coating die provided in some other embodiments of the present application;

[0048] FIG8 is a partial cross-sectional schematic diagram of a coating die provided in some other embodiments of the present application;

[0049] FIG9 is a partial cross-sectional schematic diagram of a coating die provided in some other embodiments of the present application;

[0050] FIG10 is a schematic structural diagram of the first component of the coating die provided in some other embodiments of the present application

[0051] FIG11 is a schematic cross-sectional view of a coating die provided in some other embodiments of the present application.

[0052] The following are the descriptions of the reference numerals:

[0053] 1. First die head; 2. Second die head; 3. Cavity; 4. Discharge port; 5. Feed port; 6. Gasket; 7. First fixing member; 8. Second fixing member; 9. Adjustment piece;

[0054] 11. First body; 111. First concave portion; 112. First convex portion; 112a, second surface; 113. Second convex portion;

[0055] 12. First component; 121. Second recess; 122. First end portion; 123. Position-limiting recess; 124. Base; 125. Protective layer; 12a. First surface; 12b. First side surface; 12c. Second side surface; 12d. Outer end surface; 12e. Third surface; 12f. Third side surface; 12g. First inclined surface; 12h. Second inclined surface; 12i. Fourth surface;

[0056] 13. Layering;

[0057] 21. Second body; 211. Third concave portion; 212. Third convex portion; 212a, Sixth surface; 213. Fourth convex portion;

[0058] 22, second component; 221, fourth recess; 22a, fifth surface;

[0059] X, third direction; Y, second direction; Z, first direction. DETAILED DESCRIPTION

[0060] 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.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] The term "multiple" used in this application refers to more than two (including two). Similarly, the term "multiple groups" refers to more than two (including two).

[0067] In this application, the term "parallel" includes not only the absolutely parallel situation, but also the roughly parallel situation conventionally recognized in engineering; at the same time, "vertical" also includes not only the absolutely vertical situation, but also the roughly vertical situation conventionally recognized in engineering.

[0068] Coating is the process of applying a thin layer of coating material in liquid or powder form to surfaces such as fabric, paper, metal foil or plate. Coating is an essential step in the manufacturing process of battery cells.

[0069] A battery cell typically includes an electrode assembly. This assembly includes a positive electrode sheet and a negative electrode sheet. During the charge and discharge process of a battery cell, active ions (such as lithium ions) are inserted and removed back and forth between the positive and negative electrode sheets.

[0070] The positive electrode sheet may include a positive electrode current collector and a positive electrode active material layer disposed on at least one surface of the positive electrode current collector. For example, the positive electrode current collector may be a metal foil or a composite current collector. For example, the positive electrode active material layer includes a positive electrode active material. The positive electrode active material may include at least one of the following materials: a lithium-containing phosphate, a lithium transition metal oxide, and modified compounds thereof.

[0071] The negative electrode sheet may include a negative electrode current collector and a negative electrode active material layer disposed on at least one surface of the negative electrode current collector. For example, the negative electrode current collector may be a metal foil, metal foam, carbon foam, or a composite current collector. For example, the negative electrode active material layer includes a negative electrode active material, which 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.

[0072] During the production of battery cells, both positive and negative electrode sheets are made using a coating process. For example, a positive electrode active material, a conductive agent, a binder, and a solvent are mixed to form a paste-like viscous slurry. The paste-like viscous slurry is then uniformly and continuously or intermittently coated on a substrate (e.g., aluminum foil) to form the positive electrode sheet.

[0073] In related technologies, a coating die is typically used to apply slurry to a substrate. During the coating process, the portion of the die near the discharge port is subject to electrochemical corrosion from the slurry and friction from the particles within the slurry. After extended periods of continuous coating, significant wear can occur in certain areas of the die, resulting in localized coating weight irregularities and impacting coating weight consistency.

[0074] When the coating die head is worn, it is usually necessary to grind the coating die head, which will cause the production line to stop, reduce coating efficiency, and increase product production costs.

[0075] In view of this, an embodiment of the present application provides a technical solution, which provides a detachable component at the discharge position so that the component can be replaced after it is worn, thereby shortening downtime, improving coating efficiency, and reducing production costs.

[0076] The coating die provided in the embodiment of the present application can be used for, but is not limited to, the production of pole pieces, and can also be used for the production of other workpieces that require a coating process.

[0077] Figure 1 is a schematic structural diagram of a coating die provided in some embodiments of the present application; Figure 2 is a schematic rear view of a coating die provided in some embodiments of the present application; Figure 3 is an enlarged schematic diagram of the coating die shown in Figure 1 at the circular frame; Figure 4 is a schematic cross-sectional view of the coating die shown in Figure 2 taken along the AA direction; Figure 5 is an enlarged schematic diagram of Figure 4 at the circular frame; Figure 6 is a schematic diagram of the first component of the coating die provided in some embodiments of the present application.

[0078] 1 to 6 , the coating die of the embodiment of the present application includes a first die 1 and a second die 2 , and the first die 1 and the second die 2 are arranged along a first direction Z.

[0079] For example, the first direction Z may be parallel to the up-down direction. One of the first die 1 and the second die 2 may be an upper die, and the other of the first die 1 and the second die 2 may be a lower die.

[0080] In some embodiments, the first die head 1 includes a first body 11 and a first component 12, and the first component 12 is detachably connected to the first body 11. A cavity 3 for accommodating the slurry is formed between the second die head 2 and the first body 11, and a discharge port 4 connected to the cavity 3 is formed between the first component 12 and the second die head 2.

[0081] The coating die can be used to apply the slurry to the surface of the substrate. For example, the substrate can be a strip-shaped structure that passes through the discharge port 4. The slurry is applied to the surface of the substrate through the discharge port 4 under the action of pressure. The slurry applied to the surface of the substrate forms a coating.

[0082] Illustratively, the substrate is a metal foil. The slurry includes an active material, a binder, a conductive agent, and a solvent. Optionally, the active material is a positive electrode active material or a negative electrode active material.

[0083] The first component 12 can be connected to the first body 11 by snap connection, crimping, fastener connection or other detachable connection methods.

[0084] The first component 12 and the first body 11 may be made of the same material or different materials.

[0085] The first component 12 may be one or more.

[0086] During the coating process, the slurry flowing out of the discharge port 4 may corrode and wear the first component 12. In the embodiment of the present application, even if the first component 12 becomes worn, it can be simply removed and replaced with a new one. This reduces coating die head downtime, improves coating efficiency, and reduces production costs. The worn first component 12 can be repaired and then used again, thereby extending the service life of the first component 12.

[0087] In some embodiments, the first body 11 is connected to the second die head 2. For example, the first body 11 and the second die head 2 are connected by fasteners, abutment or other means.

[0088] In some embodiments, the coating die head is provided with a feed port 5 connected to the cavity 3. The feed port 5 is used to connect to an external feeding device. The feeding device injects the slurry into the feed port 5 at a certain pressure. The feed port 5 can be one or more.

[0089] The feed port 5 can be provided on the first body 11 or on the second die head 2. For example, the feed port 5 is provided on the second die head 2.

[0090] In some embodiments, the coating die further includes a spacer 6 , which can be disposed between the first die 1 and the second die 2 to space the first die 1 and the second die 2 apart in the first direction Z.

[0091] The gasket 6 can also separate the first component 12 and the second die head 2 to form a discharge port 4 between the first component 12 and the second die head 2 .

[0092] In some embodiments, the thickness of the spacer 6 is 0.5 mm to 2 mm. Exemplarily, the thickness of the spacer 6 is 0.5 mm, 0.6 mm, 0.8 mm, 1.0 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm or 2 mm.

[0093] In some embodiments, the gasket 6 divides the discharge port 4 into a plurality of sub-outlets to form multiple coatings on the electrode.

[0094] In some embodiments, the coating die further includes a first fixing member 7 movably disposed on the first body 11 along a first direction Z. In the first direction Z, a portion of the first component 12 is clamped between the first fixing member 7 and the first body 11 .

[0095] There may be one or more first fixing members 7. Optionally, there may be more than one first fixing member 7, and the plurality of first fixing members 7 are arranged along the third direction X, and the third direction X, the second direction Y, and the first direction Z are perpendicular to each other.

[0096] The first fixing member 7 and the first body 11 can clamp the first component 12 from both sides in the first direction Z, thereby fixing the first component 12 to the first body 11. When the first component 12 needs to be replaced, the first fixing member 7 can be moved along the first direction Z to release the first fixing member 7 from the first component 12. The use of compression assembly facilitates disassembly and installation.

[0097] In some embodiments, the first fixing member 7 is threadedly connected to the first body 11 , and the first fixing member 7 can adjust the pressure applied by the first fixing member 7 to the first component 12 by rotating.

[0098] The first fixing member 7 can be a bolt, a stud, a screw or other threaded member. For example, the thread axis of the thread of the first fixing member 7 can be parallel to the first direction Z.

[0099] By rotating the first fixing member 7 , the first component 12 can be fastened to the first body 11 or the first component 12 can be loosened, thereby facilitating the disassembly and installation of the first component 12 .

[0100] In some alternative embodiments, the first fixing member 7 may be a pressure rod or a pressure block, and the coating die head further includes a driver connected to the first fixing member 7, which can drive the first fixing member 7 to move along the first direction Z. For example, the driver may be a cylinder or a linear motor.

[0101] In some embodiments, a first recess 111 is defined on one side of the first body 11 along a second direction Y, where the second direction Y intersects the first direction Z. A portion of the first component 12 is received in the first recess 111 .

[0102] Optionally, the second direction Y is perpendicular to the first direction Z.

[0103] When the first component 12 is installed, the first recess 111 can position the first component 12 , thereby simplifying the assembly process.

[0104] For example, the first component 12 may be inserted into the first recess 111 along the second direction Y.

[0105] In some embodiments, the first body 11 includes a first convex portion 112 and a second convex portion 113 arranged along the first direction Z, the first concave portion 111 is arranged between the first convex portion 112 and the second convex portion 113, and the first convex portion 112 is located on a side of the second convex portion 113 close to the second die head 2.

[0106] The first convex portion 112 and the second convex portion 113 can limit the first component 12 from both sides of the first direction Z, thereby improving the stability of the first component 12, reducing the vibration of the first component 12, and improving the consistency of the coating weight.

[0107] In some embodiments, the coating die head further includes a first fixing member 7, which is movably connected to the second protrusion 113 along a first direction Z and is used to press against the first component 12. The first fixing member 7 and the first protrusion 112 can clamp the first component 12 from both sides to secure the first component 12. The first component 12 can also be loosened by moving the first fixing member 7.

[0108] In some embodiments, the first fixing member 7 is threadedly connected to the second protrusion 113. Optionally, one end of the first fixing member 7 away from the first component 12 is exposed to facilitate rotation of the first component 12 by an external device.

[0109] In some embodiments, the first fixing member 7 may also be omitted, and the first component 12 is inserted into the first recess 111 and interference fits with the first body 11 , thereby achieving fixation of the first component 12 .

[0110] In some embodiments, the first component 12 is disposed on one side of the first body 11 along the second direction Y, where the second direction Y intersects the first direction Z. A second recess 121 is defined on the side of the first component 12 facing the first body 11 along the second direction Y. The first body 11 includes a first protrusion 112 received in the second protrusion 121 , and the first protrusion 112 is fixed to the first component 12 .

[0111] When installing the first component 12, the second concave portion 121 can cooperate with the concave portion of the first convex portion 112, thereby achieving the positioning of the first component 12 and simplifying the assembly process. In addition, the first convex portion 112 can also be used to achieve the fixation of the first component 12.

[0112] In some embodiments, the first component 12 includes a first surface 12a facing the second die head 2, with the first surface 12a and the second die head 2 forming a discharge port 4. The second concave portion 121 extends to the first surface 12a along the first direction Z. The first convex portion 112 includes a second surface 112a facing the second die head 2, and the first surface 12a is flush with the second surface 112a.

[0113] The first surface 12a is flush with the second surface 112a, allowing the slurry flowing along the second surface 112a to flow smoothly into the first surface 12a, thereby reducing the resistance to the slurry flow. The second recess 121 extends to the first surface 12a, which can reduce the area of ​​the first surface 12a. The first surface 12a with a smaller area is easier to fine-grind, thereby reducing the roughness of the first surface 12a, reducing the friction coefficient of the first surface 12a, reducing the friction between the first surface 12a and the slurry, and improving the wear resistance of the first surface 12a.

[0114] In some embodiments, the first component 12 further includes a first side surface 12b and a second side surface 12c for defining the second concave portion 121 . The second side surface 12c is located on the side of the first convex portion 112 away from the second die head 2 . The first side surface 12b connects the second side surface 12c and the first surface 12a .

[0115] In the second direction Y, the first protrusion 112 abuts against the first side surface 12 b to reduce the risk of slurry entering between the first protrusion 112 and the first side surface 12 b.

[0116] In some embodiments, the first component 12 has a first end portion 122 at one end away from the first body 11 along the second direction Y. A cross section of the first end portion 122 perpendicular to the second direction Y gradually decreases in a direction away from the first body 11 .

[0117] When the outer end surface 12d of the first end portion 122 away from the first body 11 is worn, the first end portion 122 can be ground to restore the flatness of the outer end surface 12d. In the embodiment of the present application, the outer end surface 12d has a smaller area, which can reduce the difficulty of grinding.

[0118] In some embodiments, the dimension H1 of the first component 12 along the first direction Z is 5 mm to 30 mm. If H1 is ≥ 5 mm, the first component 12 can have a higher strength. If H1 is ≤ 30 mm, the weight and volume of the first component 12 can be reduced, making replacement easier.

[0119] In some embodiments, a dimension H2 of the outer end surface 12d along the first direction Z is 1 mm-2 mm. The outer end surface 12d has a smaller area, which can reduce the difficulty of grinding.

[0120] In some embodiments, the first component 12 includes a first surface 12a and a third surface 12e disposed along a first direction Z. Exemplarily, the first surface 12a and the third surface 12e are perpendicular to the first direction Z. A distance H1 is provided between the first surface 12a and the third surface 12e along the first direction Z.

[0121] In some embodiments, the first fixing member 7 is pressed against the third surface 12 e along the first direction Z.

[0122] In some embodiments, the second side surface 12c is parallel to the third surface 12e. In the first direction Z, a distance H3 between the second side surface 12c and the third surface 12e is 3 mm-15 mm.

[0123] Exemplarily, the depth of the second recess 121 along the first direction Z is H1 - H3 .

[0124] In some embodiments, the first component 12 includes a third side surface 12f connecting the second side surface 12c and the third surface 12e.

[0125] Exemplarily, the third side surface 12f, the first side surface 12b, and the outer end surface 12d are all perpendicular to the second direction Y. Exemplarily, a dimension of the third side surface 12f along the first direction Z is H3.

[0126] In some embodiments, the first component 12 has a dimension L1 along the second direction Y, and L1 is 6 mm to 30 mm. For example, in the second direction Y, a distance between the third side surface 12 f and the outer end surface 12 d is equal to L1.

[0127] In some embodiments, a dimension of the third surface 12e along the second direction Y is L2, and L2 is 4 mm-20 mm.

[0128] In some embodiments, a depth of the second recess 121 along the second direction Y is L3 , where L3 is less than L2 , so as to reduce strength loss of the first component 12 .

[0129] Optionally, L3 is 2mm-10mm.

[0130] In some embodiments, the first end portion 122 includes a first inclined surface 12g, and the first inclined surface 12g and the first surface 12a are respectively connected to two ends of the outer end surface 12d along the first direction Z. Exemplarily, the angle between the first inclined surface 12g and a plane parallel to the first surface 12a is a1, and a1 is 30°-50°.

[0131] In some embodiments, the first component 12 further includes a second inclined surface 12h , and the second inclined surface 12h and the third side surface 12f are respectively connected to two ends of the third surface 12e along the second direction Y.

[0132] In some embodiments, an included angle a2 between the second inclined surface 12h and another plane parallel to the first surface 12a is 50°-80°.

[0133] In some embodiments, the first component 12 further includes a fourth surface 12i connecting the first inclined surface 12g and the second inclined surface 12h. Optionally, the fourth surface 12i is parallel to the first surface 12a.

[0134] In some embodiments, the first component 12 is one. For example, the first component 12 is a long strip structure extending along the third direction X.

[0135] In some embodiments, the surface hardness of the first component 12 is higher than that of the first body 11. Compared with the first body 11, the first component 12 has a higher surface hardness and is more wear-resistant, thereby extending the service life of the first component 12 and reducing the frequency of replacement of the first component 12.

[0136] Exemplarily, the aforementioned surface hardness may be Rockwell hardness.

[0137] In some embodiments, the surface hardness of the first component 12 is 30HRC-70HRC. The first component 12 is more wear-resistant, thereby extending the service life of the first component 12 and reducing the frequency of replacing the first component 12.

[0138] For example, Rockwell hardness is a measure of hardness determined by the depth of plastic deformation of an indentation, with 0.002 mm as a unit of hardness. Using different indenters and test forces in a Rockwell hardness test produces different combinations, corresponding to different Rockwell hardness scales. HRC can be measured using a 150 kg load and a diamond cone indenter.

[0139] Optionally, the surface hardness of the first component 12 is 30HRC, 40HRC, 45HRC, 50HRC, 60HRC or 70HRC.

[0140] In some embodiments, the material of the first component 12 includes at least one of cast stone, alumina ceramics, silicon carbide ceramics, zirconia ceramics, engineering polymer plastics, wear-resistant rubber, stainless steel with a diamond-like coating on the surface, or stainless steel with a nano-composite coating on the outer surface.

[0141] Materials such as cast stone, alumina ceramics, silicon carbide ceramics, zirconia ceramics, engineering polymer plastics, and wear-resistant rubber are insulating. The first component 12 made of these materials is not easily electrochemically corroded by the slurry, thereby slowing down the wear of the first component 12, extending the service life of the first component 12, and reducing the frequency of replacing the first component 12.

[0142] Materials such as cast stone, alumina ceramics, silicon carbide ceramics, zirconia ceramics, stainless steel with a diamond-like coating on the surface, and stainless steel with a nano-composite coating on the outer surface have high surface hardness and strong wear resistance, and can withstand the impact and friction of slurry particles; the first component 12 made of these materials is not easy to wear, thereby extending the service life of the first component 12 and reducing the frequency of replacement of the first component 12.

[0143] In some embodiments, the second die head 2 includes a second body 21 and a second component 22 . The second body 21 and the first body 11 are arranged along the first direction Z and are used to define the mold cavity 3 . The second component 22 and the first component 12 are arranged along the first direction Z and are used to define the discharge port 4 .

[0144] If the second component 22 becomes worn, it can be simply removed and replaced with a new one. This reduces coating die downtime, improves coating efficiency, and reduces production costs. The worn second component 22 can be repaired and then used again, extending its service life.

[0145] In some embodiments, the first component 12 and the second component 22 may be made of the same material or different materials. For example, the first component 12 and the second component 22 are made of the same material.

[0146] In some embodiments, the first component 12 and the second component 22 may have the same or different shapes. For example, when viewed from the third direction X, the first component 12 and the second component 22 have the same shape, and the third direction X, the second direction Y, and the first direction Z are perpendicular to each other.

[0147] In some embodiments, the first body 11 is connected to the second body 21 .

[0148] In some embodiments, the feed port 5 is disposed on the second body 21 .

[0149] In some embodiments, the coating die further includes a second fixing member 8 movably disposed on the second body 21 along the first direction Z. In the first direction Z, a portion of the second component 22 is clamped between the second fixing member 8 and the second body 21 .

[0150] In some embodiments, the second fixing member 8 is threadedly connected to the second body 21 , and the second fixing member 8 can adjust the pressure applied by the second fixing member 8 to the second component 22 by rotating.

[0151] In some embodiments, a third recess 211 is defined on one side of the second body 21 along the second direction Y. A portion of the second component 22 is received in the third recess 211 .

[0152] In some embodiments, the second body 21 includes a third convex portion 212 and a fourth convex portion 213 arranged along the first direction Z, the third concave portion 211 is arranged between the third convex portion 212 and the fourth convex portion 213, and the third convex portion 212 is located on a side of the fourth convex portion 213 close to the first die head 1.

[0153] In some embodiments, the second fixing member 8 is movably connected to the fourth protrusion 213 along the first direction Z and is used to press the second component 22 . Optionally, the second fixing member 8 is threadedly connected to the fourth protrusion 213 .

[0154] In some embodiments, the second component 22 is disposed on one side of the second body 21 along the second direction Y. A fourth recess 221 is defined on the side of the second component 22 facing the second body 21 along the second direction Y. The second body 21 includes a third protrusion 212 received in the fourth protrusion 221 . The third protrusion 212 is fixed to the second component 22 .

[0155] In some embodiments, the second component 22 includes a fifth surface 22 a facing the first die head 1 , and a discharge port 4 is formed between the first surface 12 a and the fifth surface 22 a .

[0156] In some embodiments, the first surface 12a is parallel to the fifth surface 22a. Optionally, the parallelism between the first surface 12a and the fifth surface 22a is controlled to be 2 μm-5 μm.

[0157] In some embodiments, the fourth concave portion 221 extends to the fifth surface 22 a along the first direction Z. The third convex portion 212 includes a sixth surface 212 a facing the first convex portion 112 , and the fifth surface 22 a is flush with the sixth surface 212 a.

[0158] In some embodiments, the surface hardness of the second component 22 is higher than the surface hardness of the second body 21 .

[0159] In some embodiments, the surface hardness of the second component 22 is 30HRC-70HRC.

[0160] In some embodiments, the material of the second component 22 includes at least one of cast stone, alumina ceramics, silicon carbide ceramics, zirconia ceramics, engineering polymer plastics, wear-resistant rubber, stainless steel with a diamond-like coating on the surface, or stainless steel with a nano-composite coating on the outer surface.

[0161] In some embodiments, the first component 12 and the second component 22 are symmetrical about a reference plane that is perpendicular to the first direction Z.

[0162] In some embodiments, the first recess 111 passes through the first body 11 along the third direction X.

[0163] In some embodiments, the second recess 121 passes through the first component 12 along the third direction X.

[0164] In some embodiments, the third recess 211 passes through the second body 21 along the third direction X.

[0165] In some embodiments, the fourth recess 221 passes through the second component 22 along the third direction X.

[0166] In some embodiments, the coating die is used to coat battery pole pieces.

[0167] In some embodiments, the dimension of the coating die along the third direction X is 150 mm to 300 mm larger than the dimension of the battery pole piece along the third direction X. Optionally, the dimension of the battery pole piece along the third direction X is 1000 mm to 1800 mm.

[0168] In some embodiments, a dimension of the cavity 3 along the third direction X is 75 mm to 200 mm smaller than a dimension of the coating die along the third direction X.

[0169] In some embodiments, a receiving recess is provided on a side of the second body 21 facing the first body 11 , and the mold cavity 3 includes the receiving recess.

[0170] In some embodiments, along the second direction Y, the size of the accommodating recess is 60 mm-90 mm.

[0171] In some embodiments, the coating die head further includes a bead 13 disposed in the cavity 3, and the bead 13 can be fixed to the first body 11. The bead 13 and the wall of the accommodating recess can define a flow channel for the slurry to flow.

[0172] In some embodiments, along the second direction Y, the size of the bead 13 is 3 mm to 10 mm smaller than the size of the receiving recess.

[0173] In some embodiments, the dimension of the bead 13 along the third direction X is 5 mm to 20 mm smaller than the dimension of the cavity along the third direction X.

[0174] In some embodiments, the layer strip 13 may be one or multiple layers spliced ​​along the third direction X.

[0175] In some embodiments, the pressure strip 13 is fixed to the first body 11 by bolts.

[0176] In some embodiments, the first body 11 is made of stainless steel. Optionally, the first body 11 is made of SUS630 stainless steel. Further, the first body 11 may be heat treated to increase the surface hardness of the first body 11 to 25HRC-45HRC, thereby improving the wear resistance of the first body 11.

[0177] In some embodiments, the second body 21 is made of stainless steel. Optionally, the second body 21 is made of SUS630 stainless steel. Further, optionally, the second body 21 can be heat treated to increase the surface hardness of the second body 21 to 25HRC-45HRC, thereby improving the wear resistance of the second body 21.

[0178] In some embodiments, during coating, the slurry flow rate at the outlet 4 is 0.03 m / s to 0.5 m / s. The coating die head of the present application can perform high-speed coating, improving coating efficiency; the first component 12 and the second component 22 have high wear resistance and can be used in high-speed coating scenarios.

[0179] FIG7 is a partial cross-sectional schematic diagram of a coating die provided in some other embodiments of the present application.

[0180] 7 , in some embodiments, a limiting recess 123 is provided on one side of the first component 12 facing the first fixing member 7 along the first direction Z, and the first fixing member 7 abuts against the bottom surface of the limiting recess 123 .

[0181] Exemplarily, the limiting recess 123 is recessed from the third surface 12e.

[0182] In the embodiment of the present application, a portion of the first fixing member 7 extends into the limiting recess 123, which can also limit the first component 12 in other directions intersecting with the first direction Z, thereby improving the stability of the first component 12 and improving the consistency of the coating weight.

[0183] In some embodiments, the first component 12 is provided with a plurality of limiting recesses 123 , and the plurality of limiting recesses 123 are provided in a one-to-one correspondence with the plurality of first fixing members 7 .

[0184] FIG8 is a partial cross-sectional schematic diagram of a coating die provided in some other embodiments of the present application.

[0185] As shown in FIG8 , in some embodiments, the coating die head further includes at least one adjusting piece 9 disposed in the first concave portion 111 . In the first direction Z, the adjusting piece 9 is disposed between the first convex portion 112 and the first component 12 .

[0186] The number of the adjusting piece 9 can be one or more. Optionally, the plurality of adjusting pieces 9 are stacked and arranged between the first protrusion 112 and the first component 12 .

[0187] When the first component 12 is worn, the surface of the first component 12 facing the second die head 2 needs to be ground. After grinding, the size of the first component 12 along the first direction Z is reduced. If the first component 12 remains in place, the distance between the first component 12 and the second die head 2 along the first direction Z increases, and the discharge port 4 also increases. In the embodiment of the present application, by removing the adjustment plate 9, the first component 12 can be moved as a whole toward the second die head 2 to compensate for the dimensional loss of the first component 12 after grinding, maintaining a constant distance between the first component 12 and the second die head 2 along the first direction Z.

[0188] Exemplarily, after one adjusting piece 9 is removed, the first fixing member 7 can be moved along the first direction Z to ensure pressure.

[0189] In some embodiments, a plurality of adjustment sheets 9 may be stacked between the first protrusion 112 and the first component 12. After each grinding, one adjustment sheet 9 may be removed; in this way, the first component 12 of the embodiment of the present application may be ground multiple times.

[0190] Optionally, 10-20 adjustment pieces 9 are provided between the first protrusion 112 and the first component 12 .

[0191] In some embodiments, the thickness of the adjustment sheet 9 is 20 μm to 30 μm. The thickness of the adjustment sheet 9 can be consistent with the thickness of the first component 12 that can be removed by grinding in a single pass. The adjustment sheet 9 in the embodiment of the present application has a smaller thickness, which can reduce the amount of grinding required for the first component 12 in a single pass, reduce the grinding difficulty, and increase the number of times the first component 12 can be recycled.

[0192] In some embodiments, the coating die head further includes a first fixing member 7 and at least one adjusting piece 9, which is accommodated in the second recess 121. In the first direction Z, the first fixing member 7 is located on a side of the first component 12 facing away from the first protrusion 112 and is used to press the first component 12, and the adjusting piece 9 is disposed between the first component 12 and the first protrusion 112.

[0193] In some embodiments, a plurality of adjustment sheets (not shown) stacked along the first direction Z are also disposed between the second component 22 and the third protrusion 212 .

[0194] FIG9 is a partial cross-sectional schematic diagram of a coating die provided in some other embodiments of the present application.

[0195] 9 , in some embodiments, the second recess 121 is closed on both sides along the first direction Z. The first protrusion 112 can be inserted into the second recess 121 and limit the sidewalls of the first recess 111 on both sides along the first direction Z.

[0196] The embodiment of the present application can improve the stability of the first component 12 .

[0197] FIG10 is a schematic structural diagram of the first component of the coating die provided in some other embodiments of the present application.

[0198] As shown in FIG10 , in some embodiments, the first die head 1 includes a plurality of first components 12 arranged along a third direction X, where the third direction X is perpendicular to the first direction Z. Adjacent first components 12 abut against each other and are connected along the third direction X.

[0199] The embodiment of the present application can reduce the extended length of a single first component 12 and reduce the difficulty of molding the first component 12 .

[0200] In some embodiments, adjacent first components 12 are bonded or snap-fitted.

[0201] In some embodiments, the second die head 2 includes a plurality of second components 22 arranged along the third direction X, and adjacent second components 22 are abutted against and connected along the third direction X.

[0202] FIG11 is a schematic cross-sectional view of a coating die provided in some other embodiments of the present application.

[0203] As shown in FIG11 , in some embodiments, the first component 12 includes a base 124 and a protective layer 125 disposed on the outer surface of the base 124. At least a portion of the protective layer 125 is located on the side of the base 124 facing the second die 2. The surface hardness of the protective layer 125 is higher than the surface hardness of the base 124.

[0204] By providing a protective layer 125 having a relatively high surface hardness, the first component 12 can be made more wear-resistant, thereby extending the service life of the first component 12 and reducing the frequency of replacement of the first component 12. The base 124 can have a relatively low surface hardness, which allows for greater flexibility in the selection of materials for the base 124, thereby reducing the cost of the first component 12.

[0205] In some embodiments, the protective layer 125 completely covers the substrate 124 .

[0206] In some embodiments, the material of the base 124 is the same as that of the first body 11. The embodiment of the present application can reduce the types of materials and reduce costs.

[0207] In some embodiments, the protective layer 125 includes a diamond-like coating or a nanocomposite coating. Both the diamond-like coating and the nanocomposite coating have a high surface hardness.

[0208] In some embodiments, the second component has a similar structure to the first component, and also includes a base and a protective layer.

[0209] The present application also provides a coating device for a battery electrode, the coating device comprising the coating die head of any of the above embodiments. The coating device of the present application can improve the coating efficiency and coating quality of the electrode.

[0210] 1 to 6 and 8 , an embodiment of the present application provides a coating die head, which includes a first die head 1, a second die head 2 and a gasket 6. The first die head 1 and the second die head 2 are arranged along a first direction Z, and the gasket 6 is arranged between the first die head 1 and the second die head 2.

[0211] The first die head 1 includes a first body 11 and a first component 12, and the first component 12 is detachably connected to the first body 11. The second die head 2 includes a second body 21 and a second component 22 detachably connected to the second body 21. The second body 21 and the first body 11 are arranged along the first direction Z and are used to define a cavity 3 for accommodating the slurry. The second component 22 and the first component 12 are arranged along the first direction Z and are used to define a discharge port 4, which is connected to the cavity 3.

[0212] The first direction Z, the second direction Y, and the third direction X are perpendicular to each other. A first recess 111 is provided on one side of the first body 11 along the second direction Y. The first body 11 includes a first protrusion 112 and a second protrusion 113 arranged along the first direction Z. The first recess 111 is disposed between the first protrusion 112 and the second protrusion 113. The first protrusion 112 is located on the side of the second protrusion 113 closer to the second body 21. A portion of the first component 12 is accommodated in the first recess 111.

[0213] The first component 12 has a second recess 121 on a side facing the first body 11 along the second direction Y. The first protrusion 112 is accommodated in the second recess 121. The first component 12 includes a first surface 12a facing the second die head 2. The discharge port 4 is formed between the first surface 12a and the second component 22. The second recess 121 extends along the first direction Z to the first surface 12a.

[0214] The coating die head further includes a first fixing member 7 and a plurality of adjustment pieces 9, which are accommodated in the second recess 121. In the first direction Z, the first fixing member 7 is threadedly connected to the second protrusion 113 and presses against the first component 12. The plurality of adjustment pieces 9 are stacked along the first direction Z between the first component 12 and the first protrusion 112.

[0215] The surface hardness of the first component 12 is higher than that of the first body 11. The first component 12 is made of stainless steel with a diamond-like coating on the surface, or stainless steel with a nano-composite coating on the outer surface.

[0216] Optionally, the first component 12 and the second component 22 have the same structure.

[0217] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and components may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features described in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions within the scope of the claims.

Claims

1. A coating die head, comprising: A first die head, comprising a first body and a first component, wherein the first component is detachably connected to the first body; The second die head is arranged along the first direction with the first die head, a cavity for containing slurry is formed between the second die head and the first body, and a discharge port connected to the cavity is formed between the first component and the second die head.

2. The coating die head according to claim 1, further comprising a first fixing member, wherein the first fixing member is movably disposed on the first body along the first direction; In the first direction, a portion of the first component is clamped between the first fixing member and the first body.

3. The coating die according to claim 2, wherein, The first fixing member is threadedly connected to the first main body, and the first fixing member can adjust the pressure applied by the first fixing member to the first component by rotating.

4. The coating die according to claim 2 or 3, wherein, A limiting recess is provided on one side of the first component facing the first fixing member along the first direction, and the first fixing member abuts against a bottom surface of the limiting recess.

5. The coating die according to any one of claims 1-4, wherein, A first recess is provided on one side of the first body along a second direction, and the second direction intersects with the first direction; A portion of the first member is accommodated in the first recess.

6. The coating die according to claim 5, wherein, The first body comprises a first convex portion and a second convex portion arranged along the first direction, the first concave portion is arranged between the first convex portion and the second convex portion, and the first convex portion is located on a side of the second convex portion close to the second die head; The coating die head further includes a first fixing member, which is movably connected to the second protrusion along the first direction and is used to press the first component.

7. The coating die according to claim 6, further comprising at least one adjustment sheet disposed in the first recess; In the first direction, the regulating piece is disposed between the first protrusion and the first component.

8. The coating die according to claim 7, wherein, The thickness of the regulating sheet is 20 μm-30 μm.

9. The coating die according to any one of claims 1-8, wherein, The first component is arranged on one side of the first body along a second direction, and the second direction intersects with the first direction; A second recess is provided on one side of the first component facing the first body along the second direction, and the first body includes a first protrusion received in the second recess, and the first protrusion is fixed to the first component.

10. The coating die head according to claim 9, further comprising a first fixing member and at least one adjusting piece, wherein the adjusting piece is accommodated in the second recess; In the first direction, the first fixing member is located at a side of the first component away from the first protrusion and is used to press the first component, and the adjusting sheet is arranged between the first component and the first protrusion.

11. The coating die according to claim 9 or 10, wherein, The first component comprises a first surface facing the second die head, the discharge port is formed between the first surface and the second die head; the second recess extends along the first direction to the first surface; The first protrusion includes a second surface facing the second die head, and the first surface is flush with the second surface.

12. The coating die according to claim 11, wherein, The first component further includes a first side surface and a second side surface for defining the second recess, the second side surface is located on a side of the first convex portion away from the second die head, and the first side surface connects the second side surface and the first surface; In the second direction, the first convex portion abuts against the first side surface.

13. The coating die according to any one of claims 9-12, wherein, One end of the first component away from the first body in the second direction has a first end; In a direction away from the first body, a cross-section of the first end perpendicular to the second direction gradually decreases.

14. The coating die according to any one of claims 1-13, wherein, The first die head includes a plurality of the first components arranged along a third direction, and the third direction is perpendicular to the first direction; Adjacent first components abut against and connect with each other along the third direction.

15. The coating die according to any one of claims 1-14, wherein, The surface hardness of the first component is higher than the surface hardness of the first body.

16. The coating die according to any one of claims 1-15, wherein, The surface hardness of the first component is 30HRC - 70HRC.

17. The coating die according to any one of claims 1-16, wherein, The first component includes a substrate and a protective layer provided on an outer surface of the substrate, and at least a part of the protective layer is located on a side of the substrate facing the second die head; The surface hardness of the protective layer is higher than the surface hardness of the substrate.

18. The coating die according to claim 17, wherein The material of the substrate is the same as the material of the first body.

19. The coating die according to claim 17 or 18, wherein, The protective layer includes a diamond-like carbon coating or a nano-composite coating.

20. The coating die according to any one of claims 1-19, wherein, The material of the first component includes at least one of cast stone, alumina ceramic, silicon carbide ceramic, zirconia ceramic, engineering high molecular plastic, wear-resistant rubber, stainless steel with a diamond-like carbon coating on its surface, or stainless steel with a nano-composite coating on its outer surface.

21. The coating die according to any one of claims 1-20, wherein, The second die head includes a second body and a second component, the second body and the first body are arranged along the first direction and are used to define the cavity, and the second component and the first component are arranged along the first direction and are used to define the discharge port.

22. A coating device for a battery electrode sheet, comprising the coating die head according to any one of claims 1 - 21.

Images