Coating apparatus
The coating device addresses the challenge of simultaneous slurry and insulating liquid application by using a core structure with distinct discharge ports and channels to control thickness variations and shape inconsistencies, ensuring consistent application and drying results.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- LG ENERGY SOLUTION LTD
- Filing Date
- 2025-11-10
- Publication Date
- 2026-05-21
AI Technical Summary
Existing coating devices struggle to simultaneously apply a slurry and an insulating liquid to a continuously conveyed substrate while controlling the thickness of the insulating liquid, particularly in regions adjacent to uncoated areas, leading to potential thickness variations and shape inconsistencies.
A coating device with a first die, a second die, and a core structure that includes distinct discharge ports and channels for the slurry and insulating liquid, allowing controlled application of the insulating liquid with varying flow rates and thicknesses to manage thickness variations and shape inconsistencies.
Enables simultaneous application of slurry and insulating liquid to a substrate, controlling the thickness of the insulating liquid, especially in uncoated regions, thereby preventing thickness increases and maintaining consistent shape during drying.
Smart Images
Figure KR2025018369_21052026_PF_FP_ABST
Abstract
Description
Coating device
[0001] The present invention relates to a coating device, specifically to a coating device for simultaneously applying a slurry and an insulating liquid to a substrate that is continuously conveyed, and in particular, to a coating device capable of controlling the thickness (height) of the insulating liquid applied on the substrate.
[0002] This application claims the benefit of priority based on Korean Patent Application No. 10-2024-0161531 filed November 13, 2024, and all contents disclosed in the document of said Korean patent application are incorporated herein as part of this specification.
[0003] The secondary battery includes an electrode assembly, and the electrode assembly has a structure in which a positive electrode, a negative electrode, and a separator provided between the positive and negative electrodes are alternately stacked.
[0004] As the above anode and cathode, electrodes are used in which an active material layer and an insulating layer are formed on the surface of a current collector.
[0005] These electrodes are manufactured using a coating device such as a die coater, and are produced by applying an electrode slurry containing an active material and an insulating coating liquid containing an insulating material to the surface of a current collector such that the boundary portions of the electrode slurry and the insulating coating liquid overlap.
[0006] A conventional die coater includes an upper die and a lower die, a die coater shim is interposed between the upper die and the lower die, and they are joined together by fastening them with multiple bolt members.
[0007] The lower die is equipped with a manifold that accommodates a certain volume of electrode slurry, and the manifold is connected to an external electrode slurry supply unit.
[0008] Here, the shim for the die coater serves to form an extrusion slit of appropriate height between the upper die and the lower die.
[0009] In addition, the insulating coating liquid is applied to the upper edges of both sides in the width direction of the electrode slurry applied on the current collector, and generally, after applying the electrode slurry to the current collector, the insulating coating liquid is applied through an additional process using a separate coating device.
[0010] The present invention aims to solve the problem of providing a coating device for simultaneously applying a slurry and an insulating liquid to a continuously conveyed substrate.
[0011] In addition, the present invention aims to solve the problem of providing a coating device capable of controlling the thickness (height) of the insulating liquid applied on a substrate when coating a slurry and an insulating liquid simultaneously.
[0012] In addition, the present invention aims to solve the problem of providing a coating device capable of controlling the thickness of the region adjacent to the uncoated portion among the thicknesses of the insulating liquid applied on a substrate.
[0013] A coating device related to one embodiment of the present invention comprises a first die, a second die mounted on the first die, a die body including a lip portion provided at the end of the space between the first die and the second die for discharging a slurry toward a substrate, and a first core disposed in the space between the first die and the second die, having an insulating channel for guiding the movement of an insulating liquid and a first discharge port for discharging an insulating liquid flowing through the insulating channel.
[0014] In addition, the first discharge port includes a first region adjacent to the slurry discharged through the lip portion and a second region extending from the first region in a direction away from the slurry discharged through the lip portion and having a thickness different from the thickness of the first region.
[0015] In addition, the first discharge port may include two or more regions with different thicknesses along the width direction of the lip portion. In addition, the first discharge port may include two or more regions with different heights of the flow cross-sections through which the insulating liquid is discharged along the width direction of the lip portion.
[0016] In addition, the flow rate of the insulating liquid discharged through the first region may be greater than the flow rate of the insulating liquid discharged through the second region. Accordingly, the flow rate of the insulating liquid discharged through the first region to a region adjacent to the slurry layer on the substrate may be greater than the flow rate of the insulating liquid discharged through the second region to a region relatively far from the slurry layer. That is, the amount of insulating liquid discharged to a region relatively far from the slurry layer can be reduced.
[0017] Additionally, the thickness of the first region may be greater than the thickness of the second region. Additionally, the width of the first region may be greater than the width of the second region.
[0018] In addition, the thickness of the second region may be 0.3 to 0.7 times the thickness of the first region.
[0019] In addition, the thickness of the second region may be 0.5 times the thickness of the first region.
[0020] In addition, the width of the second region may be 0.3 to 0.7 times the width of the first region.
[0021] In addition, the width of the second region may be 0.5 times the width of the first region.
[0022] Additionally, the first core has a first surface that contacts the first die and a second surface that contacts the second die, and the insulating flow path may include a flow path groove formed on the first surface.
[0023] The above Euro groove may include a first groove fluidly movably connected to a first region of a first discharge port and a second groove fluidly movably connected to a second region.
[0024] In addition, the above Eurohome may have a step at the boundary between the first area and the second area.
[0025] In addition, the thickness of the insulating channel may be smaller than the thickness of the lip portion, and the thickness of the first region may be 0.3 to 0.5 times the thickness of the first core.
[0026] Additionally, the first core may include a plurality of first cores spaced apart along the width direction of the lip portion from which the slurry is discharged. In this case, two adjacent first cores may form a slurry channel for guiding the slurry and a second discharge port for discharging the slurry within the slurry channel.
[0027] Additionally, the discharge area of the second discharge port is wider than the discharge area of the first discharge port, and the first discharge port and the second discharge port are spaced apart by a predetermined distance in the width direction of the lip portion, and the thickness of the second discharge port may be greater than the thickness of the first discharge port.
[0028] Additionally, the coating device may further include a second core disposed in the space between the first and second dies and into which a slurry flows, and at least one first core may be connected to the second core.
[0029] In addition, the first core and the second core can be formed integrally.
[0030] In addition, the coating device may include a coating roll spaced apart from the lip portion by a predetermined distance. Additionally, a slurry and an insulating liquid may be applied to a substrate on the coating roll through the lip portion, respectively.
[0031] In addition, the first die may be located upstream of the direction of entry of the substrate toward the coating roll, and the second die may be located downstream of the direction of entry of the substrate toward the coating roll.
[0032] Alternatively, the first die may be located downstream of the direction of entry of the substrate toward the coating roll, and the second die may be located upstream of the direction of entry of the substrate toward the coating roll.
[0033] In addition, the first core may be provided such that the first discharge port is located on the same line as the lip portion.
[0034] As described above, the coating device related to one embodiment of the present invention has the following effects.
[0035] A slurry and an insulating liquid can be applied simultaneously to a continuously transported substrate, and when the slurry and insulating liquid are coated simultaneously, the thickness (height) of the insulating liquid applied on the substrate can be controlled.
[0036] In particular, the thickness of the insulating liquid applied on the substrate can be controlled in the region adjacent to the uncoated area, and the shape of the insulating liquid applied on the substrate can be controlled.
[0037] In addition, when drying after coating, it is possible to prevent the phenomenon in which the thickness of the insulating layer on the substrate increases in the area adjacent to the uncoated area.
[0038] FIG. 1 is a perspective view schematically showing a coating device related to one embodiment of the present invention.
[0039] Figure 2 is an exploded perspective view of the coating device shown in Figure 1.
[0040] Figure 3 is a front view of the coating device shown in Figure 2.
[0041] FIG. 4 is a schematic perspective view of the first core.
[0042] Figure 5 is a schematic diagram illustrating the operating state of the coating device in Figure 2.
[0043] Figure 6 is an enlarged view of part A of Figure 5.
[0044] Figure 7 is a schematic diagram illustrating the form of an insulating liquid applied on a substrate.
[0045] FIG. 8 is a plan view of the first core and the second core formed integrally.
[0046] Hereinafter, a coating apparatus related to an embodiment of the present invention will be described with reference to the attached drawings.
[0047] Additionally, identical or corresponding components are assigned the same or similar reference numbers regardless of drawing symbols, and redundant descriptions thereof are omitted; furthermore, for the convenience of explanation, the size and shape of each illustrated component may be exaggerated or reduced.
[0048] FIG. 1 is a schematic perspective view showing a coating device (100) related to one embodiment of the present invention, FIG. 2 is an exploded perspective view of the coating device (100) shown in FIG. 1, and FIG. 3 is a front view of the coating device shown in FIG. 2.
[0049] A coating device (100) related to one embodiment of the present invention includes a first die (120), a second die (130) mounted on the first die (120), and a die body (110) including a lip portion (140) for discharging a slurry toward a substrate (10, see FIG. 5) which is provided at the end of the space between the first die (120) and the second die (130).
[0050] FIG. 4 is a schematic perspective view showing the first core (210), FIG. 5 is a schematic diagram for explaining one operating state of the coating device in FIG. 2, and FIG. 6 is an enlarged view of part A of FIG. 5.
[0051] The coating device (100) can perform a coating process for manufacturing an electrode for a secondary battery by applying two types of coating solutions onto a substrate (10). The two types of coating solutions may include a slurry (also called an 'electrode slurry') and an insulating solution.
[0052] The coating device (100) can discharge a slurry (S) and an insulating liquid (Q1, Q2), respectively, toward a substrate (10) conveyed by a coating roll (300). The slurry may be an electrode slurry, and the slurry applied on the substrate (10) may become an electrode slurry layer, and the insulating liquid applied on the substrate (10) may become an insulating layer covering the edge portion of the electrode slurry layer. For example, the insulating layer may be provided on one edge or both edges of the electrode slurry layer along the width direction (Y-axis direction) of the substrate (10).
[0053] The above material (10) may be a current collector. For example, the current collector may be an anode current collector. For example, the anode current collector may include stainless steel, aluminum, nickel, titanium, calcined carbon, etc. Additionally, the current collector may be a cathode current collector. For example, the cathode current collector may include copper, stainless steel, nickel, titanium, calcined carbon, etc.
[0054] The electrode slurry may include an electrode active material, a conductive material, a binder, and an additive. The electrode active material may include a positive electrode active material or a negative electrode active material. For example, the positive electrode active material may include a lithium metal composite oxide containing nickel (Ni), cobalt (Co), and manganese (Mn). Additionally, for example, the negative electrode active material may include one or more of a carbon material and a silicon material. The carbon material may refer to a carbon material having carbon atoms as its main component. The silicon material is a particle containing silicon (Si) as its main component as a metal component, and may include one or more of silicon (Si) particles and silicon oxide particles.
[0055] The insulating solution may include inorganic particles, a phenolic compound, and a binder. For example, the inorganic particles may include one or more aluminum minerals selected from boehmite, gibbsite, diaspore, aunite, and nepheline. For example, the phenolic particles may increase the dispersibility of the inorganic particles contained in the insulating solution. These phenolic compounds may include one or more of tannic acid, baicalein, luteolin, taxifolin, myricetin, quercetin, rutin, catechin, epigallocatechin gallate, butein, piceatenol, pyrogallic acid, ellagic acid, amylose, amylopectin, and xanthan gum.
[0056] In one embodiment, the coating device (100) may be configured to simultaneously apply an electrode slurry (S) and an insulating liquid (Q1, Q2) on one surface of a substrate (10).
[0057] FIG. 7 is a schematic diagram illustrating the form of the insulating liquid applied on the substrate (10).
[0058] Referring to FIGS. 6 and 7, in this document, the terms electrode slurry (S) and insulating liquid (Q1, Q2) refer to a coating liquid that flows within the die body (110) and is discharged toward the substrate (10), and the electrode slurry (S) and insulating liquid (Q1, Q2) coated on the substrate (10) are referred to as the electrode slurry layer (S1) and insulating layer (I1, I2).
[0059] The insulating liquid (Q1, Q2) may be applied to the substrate (10) to cover one or both sides of the electrode slurry layer (S1) applied on the substrate (10). The insulating liquid (Q1, Q2) is applied to the substrate (10) to cover one or both sides of the electrode slurry layer (S1) to form an insulating layer (I1, I2). The insulating layer (I1, I2) can suppress or prevent a sliding phenomenon in which the thickness of the electrode slurry layer (S1) gradually decreases at the outer edge of the electrode slurry layer (S1), and can reduce the thickness variation of the electrode slurry layer (S1) applied on the substrate (10).
[0060] In addition, the insulating layer (I1, I2) can perform the function of controlling the shape of the edge region of the electrode slurry layer (S1).
[0061] Additionally, the coating device (100) may include a die body (110) and one or more first cores (210). Additionally, in one embodiment, the coating device (100) may include a die body (110), one or more first cores (210) and a coating roll (300). Additionally, in one embodiment, the coating device (100) may include a die body (110), a plurality of first cores (210) and a coating roll (300).
[0062] The die body (110) may receive electrode slurry and insulating liquid from the outside. The die body (110) may discharge electrode slurry (S) toward a substrate (10). The die body (110) may include a discharge port configured to discharge electrode slurry (S), and the discharge port may be referred to as a lip portion (140).
[0063] In this document, the first direction (e.g., X direction) is defined as a direction parallel to the discharge direction (C) of the electrode slurry (S), the second direction (e.g., Y direction) is defined as a direction perpendicular to the discharge direction (C) of the electrode slurry, and the third direction (e.g., Z direction) is defined as a direction perpendicular to the first direction (e.g., X direction) and the second direction (e.g., Y direction). The second direction may represent the width direction of the die body (110), the width direction of the lip portion (140), or the width direction of the substrate (10).
[0064] The lip portion (140) of the die body (110) may have a slit shape formed extending in a second direction (e.g., Y direction). The length of the lip portion (140) of the die body (110) in the second direction (e.g., Y direction) may be greater than the length of the lip portion (140) of the die body (110) in the third direction (e.g., Z direction). The lip portion (140) of the die body (110) may be arranged to face a substrate (10) supported by a coating roll (300). The lip portion (140) may provide an outlet of the die body (110). Additionally, a slurry (S) and an insulating liquid (Q1, Q2) flowing inside the die body (110) may be discharged to the outside through the lip portion (140).
[0065] Additionally, the lip portion (140) may be composed of the end (121) of the first die (120) and the end (131) of the second die (130) according to a first direction toward the coating roll (300). Specifically, a slurry (S) flows through the space between the first die (120) and the second die (130), and the slurry (S) may pass through the space between the end (121) of the first die (120) and the end (131) of the second die (130), which is the end of the space, and be exposed to the outside of the die body (110). In this document, the lip portion (140) refers to a discharge port formed between the end (121) of the first die (120) and the end (131) of the second die (130). The above lip portion (140) may be a boundary separating the inside and outside of the die body (110).
[0066] The second die (130) is configured to allow electrode slurry to be supplied from the outside and may include a manifold (133) for receiving electrode slurry. Additionally, the second die (130) may include a slurry supply pipe (135) for delivering slurry supplied from outside the die body (110) to the manifold (133). The manifold (133) may be formed as a predetermined space within the second die (130) and may have a shape that extends in the width direction of the die body (110).
[0067] The first die (120) can be mounted on the second die (130) to cover the manifold (133).
[0068] The coating device (100) is disposed in the space between the first die (120) and the second die (130) and includes a first core (210) having an insulating flow path (213) that guides the movement of the insulating liquid and a first discharge port (214) that discharges the insulating liquid.
[0069] The first core (210) may be inserted into the space between the first die (120) and the second die (130). The first core (210) may be mounted to at least one of the first die (120) and the second die (130) (120 or 130) through a fastening means such as a bolt. The first core (210) may have one or more fastening holes (219) through which the fastening means passes.
[0070] The first discharge port (214) is located at the end of the insulating channel (213) and is located at the end according to the flow direction (C) of the insulating liquid within the insulating channel (213). In this document, the flow direction (C) of the insulating liquid within the insulating channel (213) may be a direction parallel to the discharge direction (C) of the slurry at the lip portion (140). The insulating liquid (Q1, Q2) flowing through the insulating channel (213) is discharged to the outside of the first core (210) through the first discharge port (214). The first discharge port (214) may be formed to be identical to the cross-sectional shape of the end portion of the insulating channel (213) facing the lip portion (140).
[0071] Additionally, the first core (210) may include an insulating fluid supply unit (215) fluidly movably connected to an insulating fluid channel (213). For example, the insulating fluid supply unit (215) may be formed as a through hole penetrating the first core (210).
[0072] For example, referring to FIG. 2, the second die (130) may receive insulating liquid from the outside. The second die (130) may be equipped with one or more insulating liquid supply pipes (137). The insulating liquid supply pipes (137) may be fluidly connected to the insulating liquid supply section (215) of the first core (210). Thus, when insulating liquid is supplied from outside the die body (110), the insulating liquid flows through the insulating liquid supply pipes (137) of the second die (130) to the insulating liquid supply section (215) of the first core (210), and the insulating liquid flowing through the insulating path (213) is discharged to the outside of the first core (210) through the first discharge port (214). At this time, the insulating liquid supply section (215) may have a shape that penetrates along the thickness (t) direction of the first core (210).
[0073] As another example, the first die (120) may receive insulating liquid from the outside. The first die (120) may be equipped with one or more insulating liquid supply pipes (not shown). The insulating liquid supply pipes may be fluidly connected to the insulating liquid supply section (215) of the first core (210). Thus, when insulating liquid is supplied from outside the die body (110), the insulating liquid flows through the insulating liquid supply pipe of the first die (120) to the insulating liquid supply section (215) of the first core (210), and the insulating liquid flowing through the insulating path (213) is discharged to the outside of the first core (210) through the first discharge port (214).
[0074] Referring to FIGS. 2 to 4, the first discharge port (214) includes a first region (217) adjacent to the slurry (S) discharged through the lip portion (140) and a second region (218) extending from the first region (217) in a direction away from the slurry discharged through the lip portion (140) and having a thickness (t2, also called 'height' or 'depth') different from the thickness (t1, also called 'height' or 'depth') of the first region (217).
[0075] The first region (217) and the second region (218) can be distinguished according to the width direction of the lip portion (140). That is, the first region (217) is a region adjacent to the slurry channel (243) along the width direction of the lip portion (140), and the second region (218) is a region relatively far from the slurry channel (243) along the width direction of the lip portion (140).
[0076] The first region (217) and the second region (218) can be connected as a single unit.
[0077] For example, the thickness (t1) of the first region (217) may be greater than the thickness of the second region (t2), and the width (217) of the first region may be greater than the width of the second region (218). In this structure, the flow rate of the insulating liquid (Q1) discharged through the first region (217) may be greater than the flow rate of the insulating liquid (Q2) discharged through the second region (218).
[0078] Referring to FIG. 7, when a slurry and an insulating liquid are applied to a substrate (10), a slurry layer (S1) and an insulating layer (I1, I2) are formed on the substrate (10), respectively. The area where the slurry layer (S1) and the insulating layer (I1, I2) are formed on the substrate (10) forms a retaining portion (11), and the area where the slurry and insulating liquid are not applied forms a non-retaining portion (12).
[0079] At this time, by controlling the flow rate of the insulating liquid (Q1) discharged through the first region (217) and the flow rate of the insulating liquid (Q2) discharged through the second region (218), the thickness of the insulating layer (I2) region relatively adjacent to the uninsulated portion (12) can be controlled.
[0080] Referring to FIG. 7(a), when the flow rate of the insulating liquid discharged through the first region (217) and the flow rate of the insulating liquid (Q2) discharged through the second region (218) are the same, the thickness (h1) of the insulating layer (I1) in the region relatively adjacent to the uninsulated portion (12) can be increased.
[0081] Referring to FIGS. 6 and FIGS. 7(b), when the flow rate of the insulating liquid (Q1) discharged through the first region (217) is greater than the flow rate of the insulating liquid (Q2) discharged through the second region (218), the insulating layer (I2) can prevent the thickness (h2) of the region relatively adjacent to the uninsulated portion (12) from increasing relatively. That is, the thickness (h2) of the insulating layer (I2) of the region relatively adjacent to the uninsulated portion (12) can be kept constant.
[0082] Additionally, the thickness (t2) of the second region (218) may be 0.3 to 0.7 times the thickness (t1) of the first region (217), and for example, the thickness (t2) of the second region (218) may be 0.5 times the thickness (t1) of the first region (217).
[0083] Additionally, the width (w2) of the second region (218) may be 0.3 to 0.7 times the width (w1) of the first region (217), and for example, the width (w2) of the second region (218) may be 0.5 times the width (w1) of the first region (217).
[0084] As described above, by forming one or more of the width and thickness (height) of the first region (217) and the second region (218) differently, the flow rate of the insulating liquid (Q1) discharged through the first region (217) and the flow rate of the insulating liquid (Q2) discharged through the second region (218) can be controlled differently.
[0085] Additionally, the first core (210) may have a first surface (211) in contact with the first die (120) and a second surface (212) in contact with the second die (130), and may have a roughly rectangular shape. At this time, the insulating flow path (213) may include a flow path groove formed on the first surface (211). The depth of the flow path groove may be smaller than the thickness (t, length in the Z-axis direction) of the first core (210). The height (length in the Z-axis direction) of the insulating flow path (213) may be smaller than the height of the lip portion (140), and the height (depth of the first flow path groove) of the first discharge port (214) may be smaller than the height of the lip portion (140). Specifically, the depth (t1) of the first region (217) where the insulating liquid flows may be smaller than the thickness (t) of the first core (210). For example, the thickness (t1, height) of the first region (217) may be 0.3 to 0.5 times the thickness (t, height) of the first core (210).
[0086] Additionally, the above-mentioned Euro-groove may have a step at the boundary between the first region (217) and the second region (218). The size of the step may correspond to the difference in depth between the first region (217) and the second region (218). For example, the above-mentioned Euro-groove may have a first groove (213a) fluidly connected to the first region (217) and a second groove (213b) fluidly connected to the second region (218). At this time, the insulating liquid supplied by the insulating liquid supply unit (215) flows through the first groove (213a) and is discharged into the first region (217), and simultaneously flows through the second groove (213b) and is discharged into the second region (218). At this time, a step (213c) may be formed between the first groove (213a) and the second groove (213b) along the thickness (t) direction of the first core (210).
[0087] Additionally, the thickness (t2, depth) of the second groove (213b) may be 0.3 to 0.7 times the thickness (t1) of the first groove (213a), and for example, the thickness (t2) of the second groove (213b) may be 0.5 times the thickness (t1) of the first groove (213a).
[0088] Additionally, the width (w2) of the second groove (213b) may be 0.3 to 0.7 times the width (w1) of the first groove (213a), and for example, the width (w2) of the second groove (213b) may be 0.5 times the width (w1) of the first groove (213a).
[0089] Referring to FIGS. 5 and 6, the first core (210) may be provided such that the first discharge port (214) is positioned in alignment with the lip portion (140). That is, the first core (210) is mounted in the space between the first die (120) and the second die (130) such that the first discharge port (214) faces the lip portion (140), and the insulating liquid can be discharged outside the lip portion (140) through the first discharge port (214).
[0090] Referring to FIGS. 2 and 4, the first core (210) may include a plurality of first cores spaced apart along the width direction (Y-axis direction) of the lip portion (140). At this time, two adjacent first cores (210) may form a slurry channel (241) for guiding the slurry and a second discharge port (243) for discharging the slurry within the slurry channel (241). The height of the slurry channel (241) may be equal to the height of the lip portion (140), and the height of the second discharge port (243) may be equal to the height of the lip portion (140). The slurry channel (241) may be the space between two adjacent first cores (210), and the second discharge port (243) may be the space between the ends of each first core (210).
[0091] For example, referring to FIGS. 5 and 6, during the process of passing between two adjacent first cores (210), the width (W1) of the slurry channel (241) can be maintained constant along the flow direction of the slurry (S).
[0092] In one embodiment, the discharge area of the second discharge port (243) may be larger than the discharge area of the first discharge port (214). Additionally, the first discharge port (214) and the second discharge port (243) may be spaced apart by a predetermined distance along the width direction of the lip portion (140).
[0093] As described above, the insulating channel (213) may include a channel groove formed in the first surface (211), and when the depth of the channel groove is smaller than the thickness (t, length in the Z-axis direction) of the first core (210), the height (thickness) of the second discharge port (243) may be greater than the height (thickness) of the first discharge port (214).
[0094] The coating device (100) includes a coating roll (300) spaced apart from the lip portion (140) by a predetermined distance, and a slurry and an insulating liquid can be applied to a substrate (10) on the coating roll (300) through the lip portion (140), respectively.
[0095] Additionally, the coating device (100) may include a plurality of first cores (210) arranged at predetermined intervals along the width direction (Y-axis direction) of the die body (110). The number of first cores (210) may be determined according to the number of slurry layers applied on the substrate (10). For example, referring to FIG. 5, when there are two electrode slurry layers along the width direction (Y-axis direction) of the substrate (10), the die body (110) may have two second discharge ports (243) from which the slurry is discharged and four first discharge ports (214) from which the insulating liquid is discharged.
[0096] In one embodiment, at least one first core (210) may have an insulating liquid supply unit (215), a plurality of insulating fluid passages (213) connected to the insulating liquid supply unit (215), and a plurality of first discharge ports (214) connected to each insulating fluid passage (213) and discharging insulating liquid. As an example, two first discharge ports (214) may be formed in one first core (210).
[0097] Referring to FIG. 2, in one embodiment, the coating device (100) may include two first cores (210) positioned at both edges of the manifold (133), and the first core (210) positioned at the center of the manifold (133) along the width direction of the lip portion may have two first discharge ports (214), and the two first cores (210) positioned at both edges of the manifold may each have one first discharge port (214).
[0098] Additionally, the coating device (100) may include a second core (230) that is positioned in the space between the first and second dies (120, 130) and into which a slurry flows. The second core (230) may surround the manifold (133) and have a shape that is open toward the lip portion (140). For example, the second core (230) may have a 'C' shape. The second core (230) may include a base member (231) arranged parallel to the width direction of the lip portion (140), and a first side member (233) and a second side member (235) that extend toward the lip portion (140) from both ends of the base member.
[0099] For example, at least one first core (210) may be connected to a second core (230). Referring to FIG. 2, the first core (210) positioned on the central side of the manifold (133) may be connected to the first die (120) or the second die (130), and two first cores (210) positioned on both sides of the manifold (133) may be connected to the first side member (233) and the second side member (235), respectively.
[0100] FIG. 8 is a plan view of the first core and the second core formed integrally.
[0101] Referring to FIG. 8, in one embodiment, the first core and the second core may be formed integrally. In this document, the core formed integrally with the first core and the second core may be referred to as a spacer core (200'). The spacer core (200') may include a base member (231) arranged parallel to the width direction of the lip portion (140), and a first side member (233) and a second side member (235) extended toward the lip portion (140) from both ends of the base member (231).
[0102] At this time, the first and second side members (233, 235) may each be provided with an insulating liquid supply unit (215), an insulating flow path (213) connected to the insulating liquid supply unit (215), and a first discharge port connected to the insulating flow path (213) for discharging insulating liquid. Additionally, the central side member (237) located on the first and second side members (233, 235) may be provided with an insulating liquid supply unit (215), a plurality of insulating flow paths (213) connected to the insulating liquid supply unit (215), and a plurality of first discharge ports connected to each insulating flow path for discharging insulating liquid.
[0103] In one embodiment, the first die (120) may be located upstream of the entry direction of the substrate (10) toward the coating roll (300), and the second die (130) may be located downstream of the entry direction of the substrate (10) toward the coating roll (300). At this time, the first core (210) may have a first surface (211) in contact with the first die (120) and a second surface (212) in contact with the second die (130), and the insulating flow path (213) may include a flow path groove formed on the first surface (211). The depth of the flow path groove may be smaller than the thickness (t, length in the Z-axis direction) of the first core (210). The height (depth, length in the Z-axis direction) of the insulating channel (213) may be smaller than the height (thickness) of the lip portion (140), and the height (depth of the first channel groove) of the first discharge port (140) may be smaller than the height (thickness) of the lip portion (140).
[0104] In another embodiment, the first die (120) may be located downstream of the entry direction of the substrate (10) toward the coating roll (300), and the second die (130) may be located upstream of the entry direction of the substrate (10) toward the coating roll (300). In this case, the first core (210) may have a first surface (211) in contact with the first die (120) and a second surface (212) in contact with the second die (130), and the insulating flow path (213) may include a flow path groove formed on the first surface (211). The depth of the flow path groove may be smaller than the thickness (t, length in the Z-axis direction) of the first core (210). The height (length in the Z-axis direction) of the insulating channel (213) may be smaller than the height of the lip portion (140), and the height (thickness, depth of the first channel groove) of the first discharge port (140) may be smaller than the height (thickness) of the lip portion (140).
[0105] The preferred embodiments of the present invention described above are disclosed for illustrative purposes only, and those skilled in the art with ordinary knowledge of the present invention will be able to make various modifications, changes, and additions within the spirit and scope of the present invention, and such modifications, changes, and additions should be considered to fall within the scope of the following claims.
[0106] According to a coating apparatus related to one embodiment of the present invention, when a slurry and an insulating liquid are coated simultaneously on a substrate, the thickness (height) of the insulating liquid applied on the substrate can be controlled.
Claims
1. A die body comprising a first die, a second die mounted on the first die, and a lip portion provided at the end of the space between the first die and the second die for discharging a slurry toward a substrate; and It includes a first core disposed in the space between a first die and a second die, having an insulating channel that guides the movement of an insulating liquid and a first discharge port that discharges the insulating liquid flowing through the insulating channel, A coating device comprising a first discharge port, a first region adjacent to the slurry discharged through the lip portion, and a second region extending from the first region in a direction away from the slurry discharged through the lip portion and having a thickness different from the thickness of the first region.
2. In Paragraph 1, A coating device in which the flow rate of the insulating liquid discharged through the first region is greater than the flow rate of the insulating liquid discharged through the second region.
3. In Paragraph 2, The thickness of the first region is greater than the thickness of the second region, and A coating device in which the width of the first region is greater than the width of the second region.
4. In Paragraph 2, A coating device in which the thickness of the second region is 0.3 to 0.7 times the thickness of the first region.
5. In Paragraph 2, A coating device in which the width of the second region is 0.3 to 0.7 times the width of the first region.
6. In Paragraph 1, The first core has a first surface in contact with the first die and a second surface in contact with the second die, and The above insulating channel is a coating device including a channel groove formed on a first surface.
7. In Paragraph 6, The above Eurohome is a coating device having a step at the boundary between the first region and the second region.
8. In Paragraph 7, The insulating channel has a thickness smaller than the thickness of the lip, and A coating device in which the thickness of the first region is 0.3 to 0.5 times the thickness of the first core.
9. In Paragraph 1, The first core comprises a plurality of first cores spaced apart along the width direction of the lip portion from which the slurry is discharged, A coating device in which two adjacent first cores form a slurry channel for guiding the slurry and a second discharge port for discharging the slurry within the slurry channel.
10. In Paragraph 9, The discharge area of the second discharge port is wider than the discharge area of the first discharge port, and The first discharge port and the second discharge port are spaced apart by a predetermined distance with respect to the width direction of the lip portion, A coating device in which the thickness of the second discharge port is greater than the thickness of the first discharge port.
11. In Paragraph 9, It further includes a second core disposed in the space between the first and second dies, into which slurry flows, and At least one first core is a coating device connected to a second core.
12. In Paragraph 11, The above first core and second core are integrally formed coating devices.
13. In Paragraph 6, It includes a coating roll spaced apart from the above-mentioned lip portion by a predetermined distance, A coating device in which a slurry and an insulating liquid are respectively applied to a substrate on the above-mentioned coating roll through a lip portion.
14. In Paragraph 13, The first die is located on the upstream side of the entry direction of the substrate toward the coating roll, and The second die is a coating device located on the downstream side of the entry direction of the substrate toward the coating roll.
15. In Paragraph 13, The first die is located on the downstream side of the entry direction of the substrate toward the coating roll, and A coating device in which the second die is located on the upstream side of the entry direction of the substrate toward the coating roll.