Coating device

Abstract

A coating device related to an embodiment of the present invention comprises: a die body including a first die, a second die mounted on the first die, and a lip part provided at an end of a space between the first die and the second die and configured to discharge slurry toward a substrate; and a first shim disposed in the space between the first die and the second die and having an insulating flow channel for guiding the movement of an insulating liquid and a first discharge port for discharging the insulating liquid, wherein the first shim is provided so that the first discharge port is spaced apart from the lip part by a predetermined first distance along a flow direction of the insulating liquid.

Description

coating device

[0001] The present invention relates to a coating device, and more particularly, to a coating device for simultaneously applying slurry and an insulating solution to a continuously conveyed substrate, and more particularly, to a coating device capable of controlling the thickness of a fat edge region of slurry adjacent to an insulating solution applied on a substrate.

[0002] This application claims the benefit of priority to Korean Patent Application No. 10-2024-0121202, filed September 6, 2024, and Korean Patent Application No. 10-2025-0125400, filed September 4, 2025, the entire contents of which are incorporated herein by reference.

[0003] A 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 electrode and the negative electrode are alternately laminated.

[0004] As the positive and negative electrodes, electrodes having an active material layer and an insulating layer formed on the surface of the current collector are used.

[0005] These electrodes are manufactured using a coating device such as a die coater, and are manufactured by applying an electrode slurry containing an active material, etc. and an insulating coating liquid containing an insulating material, etc., to the surface of a current collector so that the boundaries thereof partially overlap.

[0006] A conventional die coater includes an upper die and a lower die, and a shim for the die coater is interposed between the upper die and the lower die, and these are connected to each other by fastening them with a plurality of bolt members.

[0007] The lower die is equipped with a manifold for accommodating a certain volume of electrode slurry, and the manifold is connected to an external electrode slurry supply unit (not shown).

[0008] Here, the die coater core serves to form a discharge slit of an appropriate height between the upper block and the lower block.

[0009] In addition, the insulating coating solution is applied to the upper portion of both edges 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 solution is applied as an additional process using a separate coating device.

[0010] The present invention aims to provide a coating device for simultaneously applying slurry and insulating liquid to a continuously transported substrate.

[0011] In addition, the present invention aims to provide a coating device capable of controlling the thickness of a fat edge region of slurry adjacent to an insulating liquid applied on a substrate when simultaneously coating slurry and an insulating liquid.

[0012] A coating device related to one embodiment of the present invention includes a die body including a first die, a second die mounted on the first die, and a lip portion provided at an end of a space between the first die and the second die and configured to discharge slurry toward a substrate, and a first shim disposed in the space between the first die and the second die and having an insulating path for guiding the movement of an insulating liquid and a first discharge port for discharging the insulating liquid, wherein the first shim is provided such that the second discharge port is spaced apart from the lip portion by a predetermined first interval along a flow direction of the insulating liquid.

[0013] For example, the first core may be arranged so that the insulating liquid passing through the first discharge port flows through the space between the first and second dies and is then discharged through the lip portion.

[0014] For example, the first core may have a first surface contacting the first die and a second surface contacting the second die, and the insulating passage may include a first passage groove formed on the first surface. In this structure, the insulating passage may have a height smaller than the height of the lip portion, and the first discharge port may have a height smaller than the height of the lip portion.

[0015] As another example, the first core may have a first surface contacting the first die and a second surface contacting the second die, and the insulating passage may be formed penetrating the first surface and the second surface. In this structure, the insulating passage may have a height equal to the height of the lip portion, and the first discharge port may have a height equal to the height of the lip portion.

[0016] In addition, the first core may include a plurality of first cores spaced apart along the width direction of the lip portion, and two adjacent first cores may form a slurry path for guiding slurry and a second discharge port for discharging slurry within the slurry path, and the first core may be arranged so that the slurry passing through the second discharge port flows through the space between the first and second dies and is then discharged to the outside through the lip portion.

[0017] Additionally, the slurry passage may have a height equal to the height of the lip portion, and the second discharge port may have a height equal to the height of the lip portion.

[0018] Additionally, in the process of passing between two adjacent first cores, the width of the slurry path can be maintained constant along the flow direction of the slurry.

[0019] Additionally, in the process of passing between two adjacent first cores, the width of the slurry path may be arranged to increase along the flow direction of the slurry.

[0020] Additionally, in the process of passing between two adjacent first cores, the width of the slurry path can increase along the flow direction of the slurry, and then the increased width can be maintained constant.

[0021] In addition, the discharge area of ​​the second discharge port is wider than the discharge area of ​​the first discharge port, the first discharge port and the second discharge port are spaced apart from each other by a predetermined distance in the width direction of the lip portion, and the height of the second discharge port may be greater than the height of the first discharge port.

[0022] Additionally, the coating device is disposed in a space between the first and second dies and includes a second core into which slurry is introduced, and at least one first core can be connected to the second core.

[0023] In addition, the coating device is disposed in a space between the first and second dies and includes a second core into which slurry is introduced, and the first core and the second core can be formed integrally.

[0024] In addition, the coating device includes a coating roll spaced apart from the lip portion by a predetermined distance, and slurry and an insulating liquid are respectively applied to a substrate on the coating roll through the lip portion, and the distance between the coating roll and the lip portion can be determined based on the first distance.

[0025] For example, the first die may be located on the upstream side of the substrate's entry direction toward the coating roll, and the second die may be located on the downstream side of the substrate's entry direction toward the coating roll.

[0026] In addition, a coating device related to another embodiment of the present invention includes a die body including a first die, a second die mounted on the first die, and a lip portion provided at an end of a space between the first die and the second die for discharging slurry toward a substrate, and a plurality of first shims disposed in the space between the first die and the second die, the first shims having an insulating channel for guiding the movement of an insulating liquid and a first discharge port for discharging the insulating liquid, wherein two adjacent first shims form a slurry channel for guiding the slurry and a second discharge port for discharging the slurry within the slurry channel, and the width of the slurry channel is provided to increase along the flow direction of the slurry in the process of passing between the two adjacent first shims.

[0027] Additionally, the first core may be arranged so that the first discharge port is positioned on the same line as the lip portion.

[0028] Additionally, each first core may have a first surface contacting the first die and a second surface contacting the second die, and the insulating passage may include a first passage groove formed on the first surface. In this structure, the insulating passage may have a height smaller than the height of the lip portion, and the first discharge port may have a height smaller than the height of the lip portion.

[0029] In addition, the discharge area of ​​the second discharge port is wider than the discharge area of ​​the first discharge port, the first discharge port and the second discharge port are spaced apart from each other by a predetermined distance in the width direction of the lip portion, and the height of the second discharge port may be greater than the height of the first discharge port.

[0030] In addition, the coating device includes a coating roll spaced apart from the lip portion by a predetermined distance, and slurry and an insulating liquid are respectively applied to a substrate on the coating roll through the lip portion, and the distance between the coating roll and the lip portion can be determined based on the first distance.

[0031] Additionally, the first die may be located on the upstream side in the direction of entry of the substrate toward the coating roll, and the second die may be located on the downstream side in the direction of entry of the substrate toward the coating roll.

[0032] Additionally, the first core forming the second discharge port may have a depression in an area adjacent to the lip portion. For example, the first core may have a depression in an area forming the second discharge port.

[0033] Additionally, the slurry path may be designed to increase in width when entering the recessed portion. Additionally, the slurry path may be designed to maintain the increased width at a constant level when passing through the recessed portion.

[0034] As described above, the coating device according to one embodiment of the present invention has the following effects.

[0035] Slurry and insulating liquid can be applied simultaneously to a continuously transported substrate, and when the slurry and insulating liquid are coated simultaneously, the thickness of the fat edge region of the slurry adjacent to the insulating liquid applied on the substrate can be controlled.

[0036] In particular, by applying the slurry onto the substrate so as to increase the thickness of the fat edge, the shape of the edge area of ​​the slurry in contact with the insulating liquid can be controlled.

[0037] In addition, when drying after coating, the shape of the edge area of ​​the slurry layer on the substrate can be implemented as a roughly right angle.

[0038] FIG. 1 is a perspective view schematically showing a coating device related to one embodiment of the present invention.

[0039] Fig. 2 is an exploded perspective view of the coating device illustrated in Fig. 1.

[0040] Figure 3 is a perspective view schematically showing the first core.

[0041] Fig. 4 is a schematic diagram for explaining the operating state of the coating device in Fig. 2.

[0042] Figure 5 is an enlarged view of part A of Figure 5.

[0043] Figure 6 is a schematic diagram for explaining the shape of the fat edge of the slurry.

[0044] Figure 7 is a plan view of the first core and the second core formed integrally.

[0045] Figure 8 is a schematic diagram for explaining an operating state of a coating device related to another embodiment of the present invention.

[0046] Figure 9 is an enlarged view of part B of Figure 8.

[0047] Hereinafter, a coating device related to one embodiment of the present invention will be described with reference to the attached drawings.

[0048] In addition, regardless of the drawing symbol, identical or corresponding components are given identical or similar reference numbers and redundant descriptions thereof are omitted, and for the convenience of explanation, the size and shape of each component depicted may be exaggerated or reduced.

[0049] FIG. 1 is a perspective view schematically showing a coating device (100) related to one embodiment of the present invention, and FIG. 2 is an exploded perspective view of the coating device (100) shown in FIG. 1.

[0050] A coating device (100) related to one embodiment of the present invention includes a die body (110) including a first die (120), a second die (130) mounted on the first die (120), and a lip portion (140) provided at an end of a space between the first die (120) and the second die (130) and for discharging slurry toward a substrate (10).

[0051] Fig. 3 is a perspective view schematically showing the first core (210), Fig. 4 is a schematic diagram for explaining the operating state of the coating device in Fig. 2, and Fig. 5 is an enlarged view of part A of Fig. 5.

[0052] The above 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 referred to as 'electrode slurry') and an insulating solution.

[0053] The coating device (10) can discharge slurry and insulating liquid, respectively, toward the substrate (10) conveyed by the coating roll (300). The slurry may be 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 an 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).

[0054] The above-described substrate (10) may be a current collector. For example, the current collector may be a positive current collector. For example, the positive current collector may include stainless steel, aluminum, nickel, titanium, calcined carbon, etc. In addition, the current collector may be a negative current collector. For example, the negative current collector may include copper, stainless steel, nickel, titanium, calcined carbon, etc.

[0055] 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 including nickel (Ni), cobalt (Co), and manganese (Mn). In addition, for example, the negative electrode active material may include at least one of a carbon material and a silicon material. The carbon material may refer to a carbon material having carbon atoms as a main component. The silicon material is a particle including silicon (Si) as a metal component as a main component, and may include at least one of silicon (Si) particles and silicon oxide particles.

[0056] 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 the group consisting of boehmite, gibbsite, diaspore, alunite, and nepheline. For example, the phenolic particles may enhance the dispersibility of the inorganic particles included in the insulating solution. These phenolic compounds may include at least one of tannic acid, baicalein, luteolin, taxifolin, myricetin, quercetin, rutin, catechin, epigallocatechin gallate, butein, piceatenol, pyrogallic acid, ellagic acid, amylose, amylopectin, and xanthan gum.

[0057] In one embodiment, the coating device (100) may be configured to simultaneously apply electrode slurry (S) and insulating liquid (I) onto one surface of the substrate (10).

[0058] 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 side, and the electrode slurry and insulating liquid coated on the substrate (10) are referred to as an electrode slurry layer and an insulating layer.

[0059] The above insulating liquid (I) can be applied onto the substrate (10) so as to cover one side or both sides of the electrode slurry layer applied onto the substrate (10). The above insulating liquid is applied onto the substrate (10) so as to cover one side or both sides of the electrode slurry layer, thereby suppressing or preventing a sliding phenomenon in which the thickness of the electrode slurry layer gradually decreases at the outer portion of the electrode slurry layer, and reducing a thickness deviation of the electrode slurry layer applied onto the substrate (10).

[0060] In addition, the insulating layer may perform a function of controlling the shape of the edge region of the electrode slurry layer. The coating device (100) may include a die body (110), one or more first shims (210). In addition, in one embodiment, the coating device (100) may include a die body (110), one or more first shims (210), and a coating roll (300). In addition, in one embodiment, the coating device (100) may include a die body (110), a plurality of first shims (210), and a coating roll (300).

[0061] The above die body (110) can receive electrode slurry and insulating liquid from the outside. The die body (110) can discharge the electrode slurry (S) toward the substrate (10). The die body (110) can include a discharge port configured to discharge the electrode slurry (S), and the discharge port can be designated by a lip portion (140).

[0062] 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).

[0063] The lip portion (140) of the die body (110) may have a slit shape extending in a second direction (e.g., Y direction). The length of the lip portion (140) of the die body (110) along the second direction (e.g., Y direction) may be greater than the length of the lip portion (140) of the die body (110) along the third direction (e.g., Z direction). The lip portion (140) of the die body (110) may be provided to face the substrate (10) supported on the coating roll (300). The lip portion (140) may provide a discharge port of the die body (110). Electrode slurry and insulating liquid may be discharged to the outside of the die body (110) through the lip portion (140), respectively.

[0064] In addition, the lip portion (114) may be configured with an end (121) of the first die (120) and an end (131) of the second die (130) in the first direction toward the coating roll (300). Specifically, the 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), which is the end of the space, and the end (131) of the second die (130), 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 that divides the inside and outside of the die body (110).

[0065] The second die (130) is provided so that electrode slurry is supplied from the outside, and may include a manifold (133) for receiving the electrode slurry. In addition, the first die (130) may include a slurry supply pipe (135) for delivering slurry supplied from the outside of 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 extending in the width direction of the die body (110).

[0066] The above first die (120) can be mounted on the second die (130) to cover the manifold (133).

[0067] The above coating device (100) is disposed in a space between a first die (120) and a second die (130), and includes a first core (210) having an insulating path (213) for guiding the movement of an insulating liquid (I) and a first discharge port (214) for discharging the insulating liquid (I).

[0068] The first shim (210) may be inserted into a space between the first die (120) and the second die (130). The first shim (210) may 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 shim (210) may have one or more fastening holes (217) through which the fastening means passes.

[0069] The above first discharge port (214) is located at the end of the insulating passage (213) and is located at the end according to the flow direction (C) of the insulating liquid within the insulating passage (213). In this document, the flow direction (C) of the insulating liquid within the insulating passage (213) may be a direction parallel to the discharge direction (C) of the slurry from the lip portion (140). The insulating liquid (I) flowing through the insulating passage (213) is discharged to the outside of the first core (210) through the first discharge port (214).

[0070] In addition, the first core (210) may include an insulating liquid supply unit (215) fluidly connected to an insulating passage (213). For example, the first die (120) may receive an insulating liquid from the outside. The first die (120) may be provided with one or more insulating liquid supply pipes (123). The insulating liquid supply pipes (123) may be fluidly connected to the insulating liquid supply unit (215) of the first core (210). Therefore, when insulating liquid is supplied from the outside of the die body (110), the insulating liquid flows to the insulating liquid supply unit (215) of the first core (210) through the insulating liquid supply pipe (123) of the first die (120), and the insulating liquid flowing through the insulating passage (213) is discharged to the outside of the first core (210) through the first discharge port (214).

[0071] In another embodiment, the second die (130) may receive an insulating liquid from the outside. The second die (130) may be provided with one or more insulating liquid supply pipes (not shown). The insulating liquid supply pipes may be fluidly connected to the insulating liquid supply portion (215) of the first core (210). Therefore, when the insulating liquid is supplied from the outside of the die body (110), the insulating liquid flows through the insulating liquid supply pipe of the second die (130) to the insulating liquid supply portion (215) of the first core (210), and the insulating liquid flowing through the insulating passage (213) may be discharged to the outside of the first core (210) through the first discharge port (214). At this time, the insulating liquid supply unit (215) may have a shape that penetrates along the thickness (t) direction of the first core (210), and as an example, the insulating liquid supply unit (215) may be a through hole that penetrates along the thickness (t) direction of the first core (210).

[0072] Referring to FIGS. 4 and 5, the first core (210) is provided such that the first discharge port (214) is spaced apart from the lip portion (140) by a predetermined first distance (d1) along the flow direction of the insulating liquid (I). Specifically, the first discharge port (214) is provided such that the first distance (d1) is spaced apart from the end (131) of the second die (130). In addition, the first discharge port (214) is provided such that the first distance (d1) is spaced apart from the end (121) of the first die (120) along the first direction (x-axis direction). That is, the first core (210) is mounted in the space between the first die and the second die such that the first discharge port (214) faces the lip portion (140), and the first core (210) is provided such that the first distance (d1) is spaced apart from the lip portion (140).

[0073] The first core (210) may have a first surface (211) that contacts the first die (120) and a second surface (212) that contacts the second die (130), and the first core (210) may have a third surface (218) that has a first discharge port (214) provided thereon. In addition, the third surface (218) may be connected to the first surface (211) and the second surface (212), respectively. At this time, the first core (210) may be arranged within the die body (110) such that the third surface (218) and the lip portion (140) are spaced apart from each other by a predetermined first distance (d1).

[0074] In addition, the first core (210) may be arranged so that the insulating liquid (I) passing through the first discharge port (214) flows through the space between the first and second dies (120, 130) and then is discharged toward the substrate (10) on the coating roll (300) through the lip portion (140). That is, the insulating liquid (I) passing through the first discharge port (214) may flow through the space between the first core (210) and the lip portion (140) and then be applied onto the substrate (10) through the lip portion (140). In this structure, the space between the first core (210) and the lip portion (140) may vary in at least one of the width (length in the Y-axis direction) and the height (length in the Z-axis direction) of the first discharge port (214).

[0075] For example, the first core (210) may have a first surface (211) that contacts the first die (120) and a second surface (212) that contacts the second die (130), and may have an approximately rectangular parallelepiped shape. At this time, 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 first flow path groove may form the insulating flow path (214). The insulating flow path (213) may have a height (length in the Z-axis direction) smaller than the height of the lip portion (140), and the first discharge port (140) may have a height (depth of the first flow path groove) smaller than the height of the lip portion (140). In this structure, the space between the first core (210) and the lip portion (140) may be larger than the width (length in the Y-axis direction) of the first discharge port (214), and the height (length in the Z-axis direction) may be larger. That is, in the space between the first core (210) and the lip portion (140), the flow cross-sectional area of ​​the insulating liquid (I) passing through the first discharge port (214) increases along the width direction and the height direction.

[0076] In another embodiment, the first core (210) may have a first surface (211) that contacts the first die (120) and a second surface (212) that contacts the second die (130), and may have an approximately rectangular parallelepiped shape. At this time, the insulating passage (213) may be formed by penetrating the first surface (211) and the second surface (21). The insulating passage (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). In this structure, the space between the first core (210) and the lip portion (140) may be larger than the width (length in the Y-axis direction) of the first discharge port (214), and the height (length in the Z-axis direction) may be maintained constant. That is, in the space between the first core (210) and the lip portion (140), the flow cross-sectional area of ​​the insulating liquid passing through the first discharge port (214) increases along the width direction of the lip portion (140).

[0077] The above 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 path (241) for guiding slurry and a second discharge port (243) for discharging slurry in the slurry path (241). The slurry path (241) may have a height equal to the height of the lip portion (140), and the second discharge port (243) may have a height equal to the height of the lip portion (140). The slurry path (241) may be a space between two adjacent first cores (210), and the second discharge port (243) may be a space between the ends of each first core (210).

[0078] Referring to FIGS. 4 and 5, during the process of passing between two adjacent first cores (210), the width (W1) of the slurry path (241) can be maintained constant along the flow direction of the slurry (S). The first core (210) can have a guide surface (219) forming the slurry path (241). The guide surface (219) can be connected to the third surface (218).

[0079] In another embodiment, the width of the slurry channel (241) may be designed to increase along the flow direction of the slurry during the process of passing between two adjacent first shims (210) (see FIG. 8), and the width of the slurry channel (241) may be designed to increase along the flow direction of the slurry during the process of passing between two adjacent first shims (210) and then maintain the increased width at a constant level. In order to implement such a flow, the first shim (210) forming the second discharge port (243) may have a recessed portion in an area adjacent to the lip portion (140). The recessed portion may have a shape that is recessed inwardly of the first shim (210), thereby widening the width of the slurry channel. At this time, the slurry channel (241) may be designed to increase in width upon entering the recessed portion, and to maintain the increased width at a constant level during the section of passing through the recessed portion.

[0080] At this time, depending on the length and width of the recessed portion, the spreading width of the slurry (S) flowing in the slurry path (241) can be adjusted. In this document, the spreading width of the slurry (S) may refer to the width of the slurry (S) spreading to both sides along the width direction of the lip portion (140). By adjusting the spreading width and / or the first gap (d1) of the slurry (S), the shape of the fat edge region of the slurry layer on the substrate (10) can be adjusted.

[0081] In addition, the first core (210) may be arranged so that the slurry (S) passing through the second discharge port (243) flows through the space between the first and second dies (120, 130) and is then discharged to the outside through the lip portion (140). That is, each first core (210) is mounted in the space between the first die and the second die so that the first discharge port (214) faces the lip portion (140), and the first core (210) is arranged to be spaced apart from the lip portion (140) by a predetermined first distance (d1), and in this structure, the second discharge port (243) connected to the slurry flow path (241) is spaced apart from the lip portion (140) by the first distance (d1). In this structure, the space between the first core (210) and the lip portion (140) in the width direction of the lip portion (140) can be larger than the width (length in the Y-axis direction) of the second discharge port (243), and the height (length in the Z-axis direction) can be maintained constant. That is, in the space between the first core (210) and the lip portion (140), the flow cross-sectional area of ​​the slurry passing through the second discharge port (243) increases along the width direction. At this time, the spreading width of the slurry can be controlled through the width direction flow of the slurry.

[0082] In one embodiment, the discharge area of ​​the second discharge port (243) may be wider than the discharge area of ​​the first discharge port (214). In addition, the first discharge port (214) and the second discharge port (243) may be spaced apart from each other by a predetermined distance along the width direction of the lip portion (140).

[0083] In addition, the insulating passage (213) may include a first passage groove formed on the first surface (211), and when the depth of the first passage 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 larger than the height of the first discharge port (214).

[0084] The coating device (100) includes a coating roll (300) spaced apart from the lip portion (140) by a predetermined distance, and slurry and insulating liquid can be applied to the substrate (10) on the coating roll (300) through the lip portion (140), respectively. At this time, the distance between the coating roll (130) and the lip portion (140) can be determined based on the first distance (d1).

[0085] Figure 6 is a schematic diagram for explaining the shape of the fat edge of the slurry layer applied on the substrate.

[0086] FIG. 6 (a) shows the shape of the edge area (E, fat edge) of the slurry layer (S1) formed with the slurry (S) applied on the substrate (10) when the first and second discharge ports of the lip portion (140) and the first core (210) are positioned on the same line, and FIG. 6 (b) shows the shape of the edge area (E, fat edge) of the slurry layer (S1) formed with the slurry (S) applied on the substrate (10) when the first and second discharge ports of the first core (210) are spaced apart from the lip portion (140) by a first interval (see FIG. 4).

[0087] Referring to FIG. 6, when the first discharge port (214) and the second discharge port (243) of the lip portion (140) and the first core (210) are positioned on the same line, it can be confirmed that the height (h1) of the edge region of the slurry layer (S1) applied on the substrate (10) is smaller than the height (h2) of the edge region of the slurry layer (S1) applied on the substrate (10) when the first discharge port and the second discharge port of the first core (210) are each spaced apart from the lip portion (140) by a first distance (d1). In this way, the height of the edge region (E) of the slurry layer (S1) applied on the substrate (10) can be adjusted through the first distance (d1).

[0088] In particular, when the first discharge port (214) and the second discharge port (243) of the first core (210) are spaced apart from the lip portion (140) by a first gap (d1), the height (h2) of the edge region of the slurry layer (S1) applied on the substrate (10) can be increased, and by increasing the height (h2) of the edge region of the slurry layer (S1), the shape of the edge region of the slurry layer (S1) adjacent to the insulating layer can be controlled, and the shape of the edge region of the slurry layer (S1) can be maintained in an approximately right-angled shape.

[0089] In addition, based on the first gap (d1), the gap between the coating roll (130) and the lip portion (140) can be determined, and when the first gap (d1) is large, the gap between the coating roll (130) and the lip portion (140) becomes large, and when the first gap (d1) is small, the gap between the coating roll (130) and the lip portion (140) can become small.

[0090] In addition, the coating device (100) may include a plurality of first shims (210) spaced apart at a predetermined interval along the width direction (Y-axis direction) of the die body (110). The number of first shims (210) may be determined depending on the number of slurry layers applied on the substrate (10). For example, referring to FIG. 4, in the case where 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) through which the slurry is discharged, and four first discharge ports through which the insulating liquid is discharged.

[0091] In one embodiment, at least one first core (210) may have an insulating liquid supply unit (215), a plurality of insulating passages (213) connected to the insulating liquid supply unit (215), and a plurality of first discharge ports (214) connected to each of the insulating passages (213) and discharging the insulating liquid (I). For example, two first discharge ports (214) may be formed in one first core (210).

[0092] Referring to FIG. 2, in one embodiment, the coating device (100) may include two first shims (210) arranged at opposite edges of the manifold (133), the first shim (210) arranged at the center side of the manifold along the width direction of the lip portion (140) may have two first discharge ports (214), and the two first shims (210) arranged at opposite edges of the manifold may each have one first discharge port (214).

[0093] In addition, the coating device (100) may include a second shim (230) disposed in a space between the first and second dies (120, 130) and into which slurry is introduced. The second shim (230) may surround the manifold (133) and have a shape that is open toward the lip portion (140). For example, the second shim (230) may have a 'ㄷ' shape. The second shim (230) may include a base member (231) arranged in parallel in the width direction of the lip portion, and a first side member (233) and a second side member (235) extending from both ends of the base member toward the lip portion (140).

[0094] 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 at the center side of the manifold (133) may be fastened to the first die (120) or the second die (130), and the two first cores (210) positioned at opposite edges of the manifold (133) may be connected to the first side member (233) and the second side member (235), respectively.

[0095] Figure 7 is a plan view of the first core and the second core formed integrally.

[0096] In one embodiment, the first core and the second core may be formed integrally. In this document, a core in which the first core and the second core are formed integrally may be referred to as a spacer core (200'). The spacer core (200') may include a base member (231) arranged in parallel in the width direction of the lip portion (140), and a first side member (233) and a second side member (235) extending from both ends of the base member (231) toward the lip portion (140). At this time, the first and second side members (233, 235) may be provided with an insulating liquid supply unit (215), an insulating passage (213) connected to the insulating liquid supply unit (215), and a first discharge port connected to the insulating passage (213) and discharging the insulating liquid, respectively. In addition, 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 passages (213) connected to the insulating liquid supply unit (215), and a plurality of first discharge ports connected to each of the insulating passages and for discharging the insulating liquid.

[0097] In addition, as an embodiment, the first die (120) may be positioned on the upstream side of the entry direction of the substrate (10) toward the coating roll (300), and the second die (130) may be positioned on the downstream side 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) that contacts the first die (120) and a second surface (212) that contacts 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 above insulating duct (213) may have a height (length in the Z-axis direction) smaller than the height of the lip portion (140), and the first discharge port (140) may have a height (depth of the first duct groove) smaller than the height of the lip portion (140).

[0098] In another embodiment, the first die (120) may be positioned on the downstream side of the entry direction of the substrate (10) toward the coating roll (300), and the second die (130) may be positioned on the upstream side 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) that contacts the first die (120) and a second surface (212) that contacts 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 above insulating duct (213) may have a height (length in the Z-axis direction) smaller than the height of the lip portion (140), and the first discharge port (140) may have a height (depth of the first duct groove) smaller than the height of the lip portion (140).

[0099] FIG. 8 is a schematic diagram for explaining an operating state of a coating device (100') related to another embodiment of the present invention, and FIG. 9 is an enlarged view of part B of FIG. 8.

[0100] A coating device (100') related to the present embodiment includes a first die (120), a second die (130) mounted on the first die, and a die body provided at an end of a space between the first die and the second die (130) and including a lip portion (140) for discharging slurry (S) toward a substrate, wherein the die body has the same structure as the die body (110) described through FIGS. 1 to 5, and common components are described with reference to FIGS. 1 to 5.

[0101] The above coating device (100') is disposed in a space between a first die (120) and a second die (130), and includes a plurality of first cores (210') having an insulating passage (213) for guiding the movement of an insulating liquid and a first discharge port (214) connected to the insulating passage (213) and for discharging the insulating liquid (I). In addition, two adjacent first cores (210') form a slurry passage (241) for guiding slurry and a second discharge port (243) for discharging slurry (S) within the slurry passage (241).

[0102] Additionally, in the process of passing between two adjacent first cores (210'), the width (W1) of the slurry path (241) is arranged to increase along the flow direction of the slurry.

[0103] Referring to FIGS. 8 and 9, the first core (210') may be arranged so that the first discharge port (214) is positioned on the same line as the lip portion (140).

[0104] In addition, the first core (210') is provided so that the first discharge port (214) is positioned on the same line as the lip portion (140) along the flow direction of the insulating liquid (I). Specifically, the first discharge port (214) is provided so that it is positioned on the same line as the end (131) of the second die (130). That is, in the present embodiment, the first core (210') is mounted in the space between the first die (120) and the second die (130) so that the first discharge port (214) faces the lip portion (140), and the first core (210') is provided so that it is positioned on the same line without being spaced apart from the lip portion (140) by a predetermined distance.

[0105] In this structure, the first core (210') can be arranged so that the insulating liquid passing through the first discharge port (214) is simultaneously discharged toward the substrate (10) on the coating roll (300) through the lip portion (140). That is, the insulating liquid passing through the first discharge port (214) can be applied onto the substrate (10) through the lip portion (140).

[0106] Additionally, each first core (210') may have a first surface contacting the first die and a second surface contacting the second die, and the insulating passage (213) may include a first passage groove formed on the first surface. In this structure, the insulating passage (213) may have a height smaller than the height of the lip portion, and the first discharge port (214) may have a height smaller than the height of the lip portion.

[0107] In addition, the discharge area of ​​the first discharge port (214) is smaller than the discharge area of ​​the second discharge port (243), the first discharge port (214) and the second discharge port (243) are spaced apart from each other by a predetermined distance in the width direction of the lip portion (140), and the height of the second discharge port (243) may be greater than the height of the first discharge port (214).

[0108] In another embodiment, the first core (210') may have a first surface contacting the first die and a second surface contacting the second die (130), and the insulating passage (213) may be formed to penetrate the first surface and the second surface. The insulating passage (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).

[0109] In addition, the first core (210') forming the second discharge port (243) may have a recessed portion (219) in an area adjacent to the lip portion. The slurry path (241) may be provided so that, when entering the recessed portion (219), the width increases (w1->w2), and the increased width (w2) is maintained constant in the section (d2) passing through the recessed portion (219).

[0110] Through this structure, when entering the recessed portion (219), the width of the slurry path (241) can be increased (w1->w2), thereby increasing the height of the edge region of the electrode slurry layer formed by the slurry (S) applied on the substrate (10).

[0111] The above-mentioned recessed portion has a shape that is recessed inwardly of the first core (210'), thereby allowing the width of the slurry path to be widened. At this time, the slurry path (241) may be designed so that its width increases when entering the recessed portion (219), and the increased width is maintained at a constant level in the section passing through the recessed portion (219).

[0112] At this time, the spreading width of the slurry (S) flowing in the slurry channel (241) can be controlled according to the length (d2) and width (k) of the recessed portion (219). The length (d2) represents the recessed length of the recessed portion (219) along the flow direction of the slurry, and the width (k) represents the recessed length of the recessed portion (219) along the width direction of the lip portion (140). In this document, the spreading width of the slurry (S) may mean the width of the slurry (S) spreading to both sides along the width direction of the lip portion (140). The slurry flowing in the slurry channel (241) spreads by the width (k) of the recessed portion (219) in the section passing through the recessed portion (219). By controlling the spreading width and / or the second gap (d2) of the above slurry (S), the shape of the fat edge region of the slurry layer on the substrate (10) can be controlled.

[0113] The preferred embodiments of the present invention described above are disclosed for the purpose of illustration, and those skilled in the art having 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.

[0114] According to a coating device related to one embodiment of the present invention, when coating slurry and insulating liquid simultaneously, the thickness of a fat edge region of the slurry adjacent to the insulating liquid applied on the substrate can be controlled.

Claims

1. A die body including a first die, a second die mounted on the first die, and a lip portion provided at an end of a space between the first die and the second die for discharging slurry toward a substrate; and A first core is disposed in a space between a first die and a second die, and includes an insulating path for guiding the movement of an insulating liquid and a first discharge port for discharging the insulating liquid. The above first core is a coating device in which the first discharge port is spaced apart from the lip portion by a predetermined first interval along the flow direction of the insulating liquid.

2. In paragraph 1, The above first core is a coating device provided so that the insulating liquid passing through the first discharge port flows through the space between the first and second dies and is then discharged through the lip portion.

3. In paragraph 2, The first die has a first surface contacting the first die and a second surface contacting the second die, A coating device in which the insulating euro comprises a first euro groove formed on a first surface.

4. In paragraph 3, The above insulating filament has a height smaller than that of the lip, The first outlet is a coating device whose height is smaller than the height of the lip.

5. In paragraph 2, The first die has a first surface contacting the first die and a second surface contacting the second die, The above insulating euro is a coating device formed by penetrating the first side and the second side.

6. In paragraph 5, The above insulating filament has a height equal to the height of the lip, The first outlet is a coating device whose height is equal to the height of the lip.

7. In paragraph 1, The above first core includes a plurality of first cores spaced apart along the width direction of the lip portion, Two adjacent first cores form a slurry path for guiding slurry and a second discharge port for discharging slurry within the slurry path, A coating device in which the slurry passing through the second discharge port flows through the space between the first and second dies and is then discharged to the outside through the lip portion.

8. In paragraph 7, The above slurry path has a height equal to the height of the lip, The second outlet is a coating device whose height is the same as the height of the lip.

9. In paragraph 7, A coating device in which the width of the slurry path is maintained constant along the flow direction of the slurry during the process of passing between two adjacent first cores.

10. In paragraph 7, A coating device in which the width of the slurry path increases along the flow direction of the slurry during the process of passing between two adjacent first cores.

11. In paragraph 10, A coating device in which, during the process of passing between two adjacent first cores, the width of the slurry path increases along the flow direction of the slurry, and then the increased width is maintained constant.

12. In paragraph 7, The discharge area of ​​the second discharge port is wider than the discharge area of ​​the first discharge port, The first discharge port and the second discharge port are spaced apart from each other by a predetermined distance in the width direction of the lip portion, A coating device wherein the height of the second discharge port is greater than the height of the first discharge port.

13. In paragraph 7, It is arranged in the space between the first and second dies and additionally includes a second core into which slurry is introduced, A coating device having at least one first core connected to a second core.

14. In paragraph 1, It includes a coating roll spaced apart from the above lip portion by a predetermined interval, Slurry and insulating liquid are applied to the substrate on the above coating roll through the lip portion, respectively. A coating device in which the gap between the coating roll and the lip portion is determined based on the first gap.

15. In paragraph 3, The first die is located on the upstream side of the substrate's entry direction toward the coating roll, The second die is a coating device located on the downstream side of the substrate's entry direction toward the coating roll.

16. A die body including a first die, a second die mounted on the first die, and a lip portion provided at an end of a space between the first die and the second die for discharging slurry toward the substrate; and It includes a plurality of first cores arranged in a space between the first die and the second die, and having an insulating path for guiding the movement of the insulating liquid and a first discharge port for discharging the insulating liquid, Two adjacent first cores form a slurry path for guiding slurry and a second discharge port for discharging slurry within the slurry path, A coating device in which the width of the slurry path increases along the flow direction of the slurry during the process of passing between two adjacent first cores.

17. In paragraph 16, The above first core is a coating device in which the first discharge port is positioned on the same line as the lip portion.

18. In paragraph 16, Each first die has a first surface contacting the first die and a second surface contacting the second die, A coating device in which the insulating euro comprises a first euro groove formed on a first surface.

19. In paragraph 16, It includes a coating roll spaced apart from the above lip portion by a predetermined interval, Slurry and insulating liquid are applied to the substrate on the above coating roll through the lip portion, respectively. The first die is located on the upstream side of the substrate's entry direction toward the coating roll, The second die is a coating device located on the downstream side of the substrate's entry direction toward the coating roll.

20. In paragraph 19, The first core has a depression in the area forming the second outlet, A coating device designed so that the slurry euro increases in width when entering the above-mentioned depression.

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