Coating apparatus and method for manufacturing coating apparatus

Abstract

A coating apparatus related to an embodiment of the present invention is a coating apparatus for applying a slurry layer to a substrate along the width direction and an insulating layer at the edges of the slurry layer, the coating apparatus comprising a die body having a first discharge port through which an insulating liquid is discharged and a second discharge port through which a slurry is discharged, wherein the first discharge port and the second discharge port are spaced a certain distance from each other in the width direction. The width of the first discharge port of the die body is chosen to satisfy General Equation 1 below. [General Equation 1] k < C+A-B-2d In General Equation 1, k is the width of the first discharge port, C is the width of the insulating layer on the substrate, A is the width of the slurry layer on the substrate, B is the width of the second discharge port, and d is the distance between the first discharge port and the second discharge port in the width direction.

Description

Coating device and method for manufacturing a coating device

[0001] The present invention relates to a coating device and a method for manufacturing a coating device, and specifically to a coating device for simultaneously applying a slurry and an insulating liquid to a substrate being transported, and in particular to a coating device and a method for manufacturing a coating device capable of preventing a gap from occurring between an insulating layer and a slurry layer applied on a substrate.

[0002] This application claims the benefit of priority based on Korean Patent Application No. 10-2025-0032090 filed March 12, 2025, 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 (not shown).

[0008] Here, the shim for the die coater serves to form an discharge 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 substrate and a method for manufacturing the coating device.

[0011] In addition, the present invention aims to solve the problem of providing a coating device and a method for manufacturing a coating device that can prevent a gap from occurring between an insulating layer and a slurry layer applied on a substrate when a slurry and an insulating liquid are simultaneously coated on a substrate that is continuously transported.

[0012] A coating device related to one embodiment of the present invention is a coating device for coating an insulating layer on a substrate along the width direction and on the edge of the slurry layer, and comprises a die body having a first discharge port for discharging an insulating liquid and a second discharge port for discharging a slurry, wherein the first discharge port and the second discharge port are arranged apart at a predetermined distance in the width direction, and the die body is determined such that the width of the first discharge port satisfies the following general formula 1.

[0013] [General Formula 1]

[0014] k < C+AB-2d

[0015] In the above general formula 1, k is the width of the first discharge port, C is the width of the insulating layer on the substrate, A is the width of the slurry layer on the substrate, B is the width of the second discharge port, and d is the distance between the first discharge port and the second discharge port along the width direction.

[0016] In this document, the width of the first discharge port may be referred to as the first width, and the width of the second discharge port may be referred to as the second width.

[0017] In addition, the die body comprises 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 and an insulating liquid toward a substrate.

[0018] In the space between the first die and the second die, a plurality of first cores arranged apart along the width direction may be provided, each having an insulating flow path that guides the movement of the insulating liquid and a first discharge port that discharges the insulating liquid.

[0019] In addition, 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.

[0020] Additionally, the first core may have a first surface in contact with the first die and a second surface in contact with the second die. For example, the insulating flow path may include a first flow path groove formed on the first surface.

[0021] In addition, the height of the insulating channel may be smaller than the height of the lip portion, and the height of the first discharge port may be smaller than the height of the lip portion.

[0022] In addition, the discharge area of ​​the second discharge port may be larger than the discharge area of ​​the first discharge port, and the thickness of the second discharge port may be larger than the thickness of the first discharge port.

[0023] In addition, the first core may be provided such that the first discharge port is located on the same line as the lip portion.

[0024] In addition, the first core may be configured such that the first discharge port is spaced apart from the lip portion by a predetermined distance along the flow direction of the insulating liquid, and the first discharge port is located inside the die body.

[0025] The coating device may include a coating roll spaced apart from the lip portion by a predetermined distance.

[0026] In addition, a slurry and an insulating liquid can be applied to the substrate on the coating roll through the lip portion, respectively.

[0027] For example, 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.

[0028] As another example, 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.

[0029] In addition, the above die body can be determined such that the first width (k) of the first discharge port satisfies the following general formula 2.

[0030] [General Formula 2]

[0031] C+AB-2d -k = α

[0032] In the above general formula 2, 0mm < α < 2.0mm, where α is greater than 0 and less than 2mm.

[0033] Additionally, the coating device may 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.

[0034] For example, the first core and the second core can be formed integrally.

[0035] In addition, according to another embodiment of the present invention, a method for manufacturing a coating device for coating a slurry layer and an insulating layer on the edge of the slurry layer along the width direction on a substrate is provided, wherein the coating device comprises a first discharge port for discharging an insulating liquid and a second discharge port for discharging a slurry, and a die body in which the first discharge port and the second discharge port are arranged apart by a predetermined distance in the width direction, and wherein the width of the first discharge port of the die body is determined to satisfy the following general formula 1.

[0036] [General Formula 1]

[0037] k < C+AB-2d

[0038] In the above general formula 1, k is the width of the first discharge port, C is the width of the insulating layer on the substrate, A is the width of the slurry layer on the substrate, B is the width of the second discharge port, and d is the distance between the first discharge port and the second discharge port along the width direction.

[0039] As described above, the coating device and the method for manufacturing the coating device related to one embodiment of the present invention have the following effects.

[0040] A slurry and an insulating liquid can be applied simultaneously on a substrate, and when the slurry and insulating liquid are coated simultaneously, the phenomenon of the insulating layer applied on the substrate and the adjacent slurry layer falling off can be prevented.

[0041] In addition, a slurry and an insulating liquid can be applied simultaneously to a substrate that is continuously transported by a coating roll, and a gap can be prevented between the slurry layer and the insulating layer applied to the substrate.

[0042] FIG. 1 is a perspective view schematically showing a coating device related to one embodiment of the present invention.

[0043] Figure 2 is an exploded perspective view of the coating device shown in Figure 1.

[0044] Figure 3 is a front view of the coating device shown in Figure 2.

[0045] Figure 4 is a perspective view of the first trial.

[0046] Figure 5 is a schematic diagram illustrating one operating state of the coating device shown in Figure 2.

[0047] Figure 6 is an enlarged view of part E of Figure 5.

[0048] FIG. 7 is a schematic diagram illustrating a method for determining the width of the first discharge port.

[0049] Figure 8 is an enlarged view of part F of Figure 7.

[0050] FIG. 9 is a schematic diagram illustrating one operating state of a coating device related to another embodiment of the present invention.

[0051] FIG. 10 is a plan view of the first core and the second core formed integrally.

[0052] Hereinafter, a coating apparatus and a method for manufacturing the coating apparatus related to an embodiment of the present invention will be described with reference to the attached drawings.

[0053] 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.

[0054] 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.

[0055] A coating device (100) related to one embodiment of the present invention is a coating device for coating an insulating layer on a substrate and along the width direction of the slurry layer, and includes a die body (110). The die body (110) has a first discharge port (214) through which an insulating liquid is discharged and a second discharge port (243) through which a slurry is discharged. Additionally, the first discharge port (214) and the second discharge port (243) are arranged apart by a predetermined distance (d) in the width direction (y-axis direction) of the moving substrate.

[0056] FIG. 4 is a perspective view of the first core (210), and FIG. 5 is a schematic diagram for explaining one operating state of the coating device shown in FIG. 2.

[0057] In this document, the X-axis direction represents a direction parallel to the discharge direction (O) of the electrode slurry (S), the Y-axis direction represents a direction perpendicular to the discharge direction (O) of the electrode slurry, and the Z-axis direction represents a direction perpendicular to the X-axis direction and the Y-axis direction. Additionally, in this document, the width direction (y-axis 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 moving substrate (10). Additionally, the z-axis direction may represent the height direction or thickness direction of the lip portion (140) and the first and second discharge ports (214, 243).

[0058] In addition, 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.

[0059] The above die body (110) may include a first die (120), a second die (130) mounted on the first die (120), and a lip portion (140) provided at the end of the space between the first die (120) and the second die (130) for discharging a slurry toward a substrate (10).

[0060] FIG. 6 is an enlarged view of section E of FIG. 5, FIG. 7 is a schematic diagram for explaining a method for determining the width of the first discharge port, and FIG. 8 is an enlarged view of section F of FIG. 7.

[0061] The coating device (100) can discharge a slurry (S) and an insulating liquid (I) respectively toward a substrate (10) conveyed by a coating roll (300). The slurry (S) may be an electrode slurry, and the slurry (S) applied on the substrate (10) becomes a slurry layer (11), and the insulating liquid applied on the substrate (10) becomes an insulating layer (12) covering the edge portion of the slurry layer (11). For example, the insulating layer (12) may be provided on one edge or both edges of the slurry layer (11) along the width direction (Y-axis direction) of the substrate (10). At this time, the insulating layer (12) must be applied in a state where it is in contact with the edge portion of the slurry layer (11). If a gap occurs between the edge portion of the slurry layer (11) and the insulating layer (12) along the width direction of the substrate (10), insulation is not achieved and a short circuit may occur.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] In one embodiment, the coating device (100) may be configured to simultaneously apply an electrode slurry (S) and an insulating liquid (I) on one surface of a substrate (10).

[0066] In this document, the terms electrode slurry and insulating liquid refer to a coating liquid that flows within the die body (110) and is discharged toward the substrate (10), and the electrode slurry and insulating liquid coated on the substrate (10) are referred to as the slurry layer (11) and the insulating layer (12).

[0067] The insulating liquid (I) may be applied to the substrate (10) to cover one or both sides of the electrode slurry layer applied to the substrate (10) along the width direction (y-axis direction) of the substrate. The insulating liquid (I) is applied to the substrate (10) to cover one or both sides of the slurry layer (11) to form an insulating layer (12). Along with insulating the slurry layer (11), the insulating layer (12) may suppress or prevent a sliding phenomenon in which the thickness of the slurry layer (11) gradually decreases at the edge portion of the slurry layer (11), and may also reduce the thickness variation of the slurry layer (11) applied to the substrate (10).

[0068] In one embodiment, the coating device (100) may include a die body (110), one or more first cores (210), and a coating roll (300) spaced apart from the lip portion (140) by a predetermined distance. In addition, in one embodiment, the coating device (100) may include a die body (110), a plurality of first cores (210), and a coating roll (300).

[0069] 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 area (140) configured to discharge electrode slurry (S) and insulating liquid (I), respectively, and the discharge area (140) may be referred to as a lip portion (140).

[0070] The lip portion (140) of the die body (110) may have a slit shape extending in the width direction (Y-axis direction). The length of the lip portion (140) of the die body (110) in the width direction (Y-direction) may be greater than the length of the lip portion (140) of the die body (110) in the thickness direction (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). Additionally, the lip portion (140) may provide an ejection area of ​​the die body (110).

[0071] 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 the 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 are the ends 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 area formed between the end (121) of the first die (120) and the end (131) of the second die (130). The lip portion (140) may be a boundary separating the inside and outside of the die body (110).

[0072] 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).

[0073] The first die (120) can be mounted on the second die (130) to cover the manifold (133).

[0074] The coating device (100) may include a plurality of first cores (210) that are disposed in the space between the first die (120) and the second die (130) and have an insulating channel (213) that guides the movement of the insulating liquid (I) and a first discharge port (214) that discharges the insulating liquid (I). The plurality of first cores (210) may be disposed apart along the width direction of the lip portion (140) (or the width direction of the substrate).

[0075] Each first core (210) can be inserted into the space between the first die (120) and the second die (130). The first core (210) can be mounted to at least one of the first die (120) and the second die (130) through a fastening means such as a bolt. The first core (210) may have one or more fastening holes (217) through which the fastening means passes.

[0076] 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 (O) of the insulating liquid within the insulating channel (213). In this document, the flow direction of the insulating liquid within the insulating channel (213) may be a direction parallel to the discharge direction (O) of the slurry at the lip portion (140). The insulating liquid (I) flowing through the insulating channel (213) is discharged to the outside of the first core (210) through the first discharge port (214).

[0077] Additionally, the first core (210) may include an insulating fluid supply unit (215) that is fluidly movably connected to an insulating fluid path (213).

[0078] For 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 (123). The insulating liquid supply pipes (123) 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 (123) 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 flow path (213) is discharged to the outside of the first core (210) through the first discharge port (214).

[0079] In another embodiment, the second die (130) may receive insulating liquid from an external source. The second die (130) 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 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).

[0080] For example, 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. In this case, the insulating flow path (213) may include a first flow path groove formed on the first surface (211). The depth of the first 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 (140) may be smaller than the height of the lip portion (140).

[0081] In another embodiment, 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. In this case, the insulating channel (213) may be formed by penetrating the first surface (211) and the second surface (21). The insulating channel (213) may have a height (length in the Z-axis direction) equal to the height of the lip portion (140), and the first discharge port (214) may have a height equal to the height of the lip portion (140).

[0082] Additionally, two adjacent first cores (210) along the width direction of the lip portion (140) 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).

[0083] Referring to FIGS. 5 and 6, each first core (210) may be provided such that the first discharge port (214) is located on the same line as the lip portion (140).

[0084] 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 (d) along the width direction (y-axis direction) of the lip portion (140).

[0085] Additionally, the insulating channel (213) may include a first channel groove formed on the first surface (211), and if the depth of the first channel groove is smaller than the thickness (t, length in the Z-axis direction) of the first core (210), the height of the second discharge port (243) may be greater than the height of the first discharge port (214).

[0086] 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 the substrate (100) on the coating roll (300) through the lip portion (140), respectively.

[0087] The number of first cores (210) can 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 from which the insulating liquid is discharged.

[0088] 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 (I). In one example, one first core (210) may have two first discharge ports (214).

[0089] Referring to FIGS. 2 and FIGS. 5, in one embodiment, the coating device (100) may include two first cores (210) positioned at both edges of the manifold (133) and one first core (210) positioned at both sides of the manifold (133). At this time, the first core (210) positioned at the center of the manifold (133) along the width direction of the lip portion (140) 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).

[0090] 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.

[0091] 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.

[0092] FIG. 10 is a plan view of the first core and the second core formed integrally.

[0093] 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) extending toward the lip portion (140) from both ends of the base member (231). At this time, the first and second side members (233, 235) may each be provided with an insulating liquid supply portion (215), an insulating flow path (213) connected to the insulating liquid supply portion (215), and a first discharge port connected to the insulating flow path (213) for discharging an insulating liquid (I). Additionally, a central side member (237) located between the first and second side members (233, 235) may be provided with an insulating liquid supply unit (215), a plurality of insulating fluid passages (213) connected to the insulating liquid supply unit (215), and a plurality (e.g., 2) of first discharge ports connected to each insulating fluid passage and discharging insulating liquid (I).

[0094] Additionally, 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 first flow path groove formed on the first surface (211). The depth of the first flow path groove may be smaller than the thickness (t, length in the Z-axis direction) of the first core (210). For example, the depth of the first flow path groove may be set to 30% to 70% of 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 (depth of the first channel groove) of the first discharge port (140) may be smaller than the height of the lip portion (140).

[0095] 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 first flow path groove formed on the first surface (211). The depth of the first 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 (depth of the first channel groove) of the first discharge port (140) may be smaller than the height of the lip portion (140).

[0096] Referring to FIGS. 6 to 8, the insulating layer (12) may be provided on one or both edges of the slurry layer (11) along the width direction (Y-axis direction) of the substrate (10). At this time, the insulating layer (12) must be applied in a manner that wraps around the edge portion of the slurry layer (11). In this way, it is important to determine the width (k) of the first discharge port to prevent a gap that may occur between the slurry layer (11) and the insulating layer (12).

[0097] The above die body (110) is determined such that the width of the first discharge port (214) (also called the first width) satisfies the following general formula 1.

[0098] [General Formula 1]

[0099] k < C+AB-2d

[0100] In the above general formula 1, k is the width (unit, mm) of the first discharge port (214), C is the width (mm) of the insulating layer (12) on the substrate (10), A is the width (mm) of the slurry layer (11) on the substrate, B is the width (mm) of the second discharge port (243), and d is the gap (mm) between the first discharge port (214) and the second discharge port (243) along the width direction.

[0101] Additionally, the die body (110) can be determined such that the first width (k) of the first discharge port (214) satisfies the following general formula 2.

[0102] [General Formula 2]

[0103] C+AB-2d -k = α

[0104] In the above general formula 2, 0mm < α < 2.0mm, where α is greater than 0 and less than 2mm.

[0105] The slurry (S) and insulating liquid (I) discharged outside the lip portion (140) spread out to both sides along the width direction of the substrate (10). At this time, the insulating liquid (I) passing through the lip portion (140) spreads out to both sides along the width direction of the substrate (10), and the spreading width (f) of the insulating liquid on both sides may be the same. Additionally, the slurry (S) passing through the lip portion (140) spreads out to both sides along the width direction of the substrate (10), and the spreading width (g) of the slurry on both sides may be the same.

[0106] Referring to FIG. 7, the gap (d) between the first discharge port (214) and the second discharge port (243) may be equal to the sum of the spreading width (f) of the insulating liquid and the spreading width (g) of the slurry. At this time, the gap (d) between the first discharge port (214) and the second discharge port (243) can be determined through the first core (210).

[0107] The sum of the spreading width (f) of the insulating liquid and the spreading width (g) of the slurry spreading out in front of the first core (210) can be equal to the gap (d, mm) between the first discharge port (214) and the second discharge port (243), as shown in the general formula 3 below.

[0108] [General Formula 3]

[0109] d = f+g

[0110] In this relationship, the width (C) of the insulating layer (12) applied on the substrate (10) can satisfy the following general formula 4.

[0111] [General Formula 4]

[0112] C = k + 2*f

[0113] In addition, the slurry spreading width (g) can satisfy the following general formula 5.

[0114] [General Formula 5]

[0115] g = (AB) / 2

[0116] By combining general formulas 3 to 5, the following general formula 6 can be derived.

[0117] [General Formula 6]

[0118] k = C + AB - 2d

[0119] The above general formula 6 is based on the premise that the sum of the spreading width (f) of the insulating liquid and the spreading width (g) of the slurry is equal to the distance (d, mm) between the first discharge port (214) and the second discharge port (243).

[0120] The present invention is based on the premise that the boundary region (F) of the slurry layer (11) and the insulating layer (12) has a width that overlaps by approximately α (unit, mm), and the width (k) of the first discharge port (214) can be determined to satisfy the general formula 1. By determining the width of the first discharge port (k) in this manner, when the slurry and insulating liquid are coated simultaneously on the substrate (10), it is possible to prevent a gap from occurring between the insulating layer (12) and the slurry layer (11) applied on the substrate (10).

[0121] FIG. 9 is a schematic diagram illustrating one operating state of a coating device related to another embodiment of the present invention.

[0122] Referring to FIG. 9, the first core (210) may be configured such that the first discharge port (214) is spaced apart from the lip portion (140) by a predetermined distance (d1) along the flow direction of the insulating liquid, and the first discharge port (214) is located inside the die body (110).

[0123] Additionally, according to another embodiment of the present invention, a method for manufacturing a coating device (100) for coating an insulating layer (120) on a substrate (10) along the width direction and on the edge of the slurry layer (11) is provided, wherein the coating device (100) comprises a first discharge port (214) for discharging an insulating liquid and a second discharge port (243) for discharging a slurry, and a die body (110) wherein the first discharge port (214) and the second discharge port (243) are arranged apart at a predetermined distance in the width direction, and wherein the width of the first discharge port (214) of the die body (100) is determined to satisfy the following general formula 1.

[0124] [General Formula 1]

[0125] k < C+AB-2d

[0126] In the above general formula 1, k is the width of the first discharge port, C is the width of the insulating layer on the substrate, A is the width of the slurry layer on the substrate, B is the width of the second discharge port, and d is the distance between the first discharge port and the second discharge port along the width direction.

[0127] Additionally, the die body (110) can be determined such that the first width (k) of the first discharge port satisfies the following general formula 2.

[0128] [General Formula 2]

[0129] C+AB-2d -k = α

[0130] In the above general formula 2, 0mm < α < 2.0mm, where α is greater than 0 and less than 2mm.

[0131] 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.

[0132] According to a coating device and a method for manufacturing a coating device related to one embodiment of the present invention, it is possible to prevent a gap from occurring between a slurry layer and an insulating layer applied on a substrate.

Claims

1. A coating apparatus for coating a slurry layer and an insulating layer on the edge of the slurry layer along the width direction on a substrate, It includes a die body having a first discharge port for discharging an insulating liquid and a second discharge port for discharging a slurry, wherein the first discharge port and the second discharge port are arranged apart at a predetermined distance in the width direction. The above die body is a coating device determined such that the width of the first discharge port satisfies the following general formula 1: [General Formula 1] k < C+AB-2d In the above general formula 1, k is the width of the first discharge port, C is the width of the insulating layer on the substrate, A is the width of the slurry layer on the substrate, B is the width of the second discharge port, and d is the distance between the first discharge port and the second discharge port along the width direction.

2. In Paragraph 1, The above die body comprises 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 and an insulating liquid toward a substrate. In the space between the first die and the second die, a plurality of first cores are provided spaced apart along the width direction, each having an insulating flow path that guides the movement of the insulating liquid and a first discharge port that discharges the insulating liquid. 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.

3. In Paragraph 2, 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 comprising a first channel groove formed on a first surface.

4. In Paragraph 3, The above insulating channel has a height smaller than the height of the lip, and A coating device in which the height of the first discharge port is smaller than the height of the lip portion.

5. In Paragraph 1, The discharge area of ​​the second discharge port is larger than the discharge area of ​​the first discharge port, and A coating device in which the thickness of the second discharge port is greater than the thickness of the first discharge port.

6. In Paragraph 2, The above-mentioned first core is a coating device configured such that the first discharge port is located on the same line as the lip portion.

7. In Paragraph 2, The above-described first core is a coating device in which a first discharge port is spaced apart from a lip portion by a predetermined distance along the flow direction of the insulating liquid, and the first discharge port is positioned inside the die body.

8. In Paragraph 3, 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.

9. In Paragraph 8, 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.

10. In Paragraph 8, 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.

11. In Paragraph 1, The above die body is a coating device in which the first width (k) of the first discharge port is determined to satisfy the following general formula 2: [General Formula 2] C+AB-2d -k = α In the above general formula 2, α can be greater than 0 and less than 2 mm.

12. In Paragraph 3, 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.

13. In Paragraph 12, The above first core and second core are integrally formed coating devices.

14. A method for manufacturing a coating apparatus for coating a slurry layer and an insulating layer on the edge of the slurry layer along the width direction on a substrate, The coating device comprises a die body having a first discharge port for discharging an insulating liquid and a second discharge port for discharging a slurry, wherein the first discharge port and the second discharge port are arranged apart at a predetermined distance in the width direction. A method for manufacturing a coating device in which the width of the first discharge port of the above die body is determined to satisfy the following general formula 1: [General Formula 1] k < C+AB-2d In the above general formula 1, k is the width of the first discharge port, C is the width of the insulating layer on the substrate, A is the width of the slurry layer on the substrate, B is the width of the second discharge port, and d is the distance between the first discharge port and the second discharge port along the width direction.

15. In Paragraph 14, A method for manufacturing a coating device in which the above die body is determined such that the first width (k) of the first discharge port satisfies the following general formula 2: [General Formula 2] C+AB-2d -k = α In the above general formula 2, α can be greater than 0 and less than 2 mm.

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