Die coater and secondary battery manufacturing equipment comprising die coater

Abstract

According to exemplary embodiments, a die coater is provided. The die coater comprises: a first die including a manifold; a shim on the first die; coating gap measurement devices coupled to the first die; and a second die coupled to the first die, wherein each of the coating gap measurement devices measures the distance to a coating roll from the lip which is a discharge part for slurry from the first die, the shim and the second die.

Description

Secondary battery manufacturing equipment including die coaters and die coaters

[0001] The present invention relates to a die coater and a secondary battery manufacturing facility including the die coater.

[0002] This application claims the benefit of priority from Republic of Korea Patent Application No. 10-2024-0067893, filed May 24, 2024, and all contents of the document in that Republic of Korea Patent Application are incorporated herein by reference.

[0003] Unlike primary batteries, secondary batteries can be charged and discharged multiple times. They are widely used as a power source for various wireless devices, including handsets, laptops, and cordless vacuum cleaners. Recently, improved energy density and economies of scale have dramatically reduced the per-unit manufacturing cost of secondary batteries. Furthermore, as the range of battery electric vehicles (BEVs) has increased to match that of fuel-powered vehicles, the primary use of secondary batteries is shifting from mobile devices to mobility.

[0004] The electrodes of secondary batteries are the most important components in terms of energy density. Secondary battery electrodes can be formed through coating, roll pressing, drying, slitting, and notching processes. Among these, the coating process, which involves applying a coating material containing an active material onto a current collector, can be performed using a die coater.

[0005] The technical problem to be achieved by the present invention is to provide a die coater with improved reliability and a secondary battery manufacturing facility including the die coater.

[0006] According to exemplary embodiments of the present invention for solving the above-described problem, a die coater is provided. The die coater comprises: a first die including a manifold; a shim on the first die; coating gap measuring devices coupled to the first die; and a second die coupled to the first die, wherein each of the coating gap measuring devices is configured to measure a distance from a lip, which is a slurry discharge portion of the first die, the shim, and the second die, to a coating roll.

[0007] The above coating gap gauges are spaced apart from each other with the core between them.

[0008] Each of the above coating gap gauges includes a dial gauge, and the dial gauge includes a bezel and a rod-shaped spindle connected to the bezel.

[0009] The thickness of the above core is smaller than the thickness of the above spindle.

[0010] The first die coater includes a groove into which the spindle is inserted.

[0011] Each of the above coating gap gauges includes a clamp for securing the dial gauge to the first die.

[0012] The clamp is fixed to the first die, the clamp includes a groove into which the stem of the dial gauge is inserted, and the stem is interposed between the bezel and the spindle.

[0013] The above core overlaps the clamp and the spindle in the extension direction of each of the above coating gap measuring devices.

[0014] Each of the above coating gap gauges further includes a tip connected to the spindle.

[0015] The width of the above tip is different from the width of the above spindle.

[0016] A die coater characterized in that the width of the tip is smaller than the width of the spindle.

[0017] The width of the above tip is greater than the thickness of the above core.

[0018] Each of the above coating gap gauges includes a tip cover overlapping the tip in a first direction, which is the extension direction of the tip.

[0019] The above tip cover includes a hole extending in the first direction.

[0020] Each of the above coating gap gauges further includes a cover adjuster configured to adjust the position of the hole of the tip cover.

[0021] The second die includes grooves that overlap the coating gap gauges.

[0022] Each of the above coating gap gauges includes a clamp for securing a dial gauge to the first die, and each of the grooves includes a first portion overlapping the clamp.

[0023] Each of the above grooves includes a second portion overlapping the spindle.

[0024] Each of the above grooves includes a third portion overlapping the tip.

[0025] Each of the above grooves includes a fourth portion overlapping the tip cover.

[0026] According to exemplary embodiments of the present invention, a die coater and a coating equipment including the same can be provided, each including coating gap measuring devices configured to measure a coating gap, which is the distance between a coating roll and a lip of the die coater. Accordingly, the coating gap distance can be accurately managed, and the reliability of secondary battery manufacturing can be improved.

[0027] The effects that can be obtained from the exemplary embodiments of the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly derived and understood by those skilled in the art to which the exemplary embodiments of the present disclosure pertain from the following description. In other words, unintended effects resulting from practicing the exemplary embodiments of the present disclosure can also be derived by those skilled in the art from the exemplary embodiments of the present disclosure.

[0028] Figure 1 illustrates a secondary battery manufacturing facility according to exemplary embodiments.

[0029] Figures 2 and 3 are perspective views illustrating a die coater according to exemplary embodiments.

[0030] Figures 4 to 6 are exploded perspective views illustrating a die coater according to exemplary embodiments.

[0031] Figure 7 shows a portion of Figure 4.

[0032] Figure 8 shows a portion of Figure 6.

[0033] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. Prior to this, it should be noted that the terms and words used in this specification and claims should not be construed as limited to their conventional or dictionary meanings. Based on the principle that the inventor can appropriately define the concepts of terms to best explain his or her invention, they should be interpreted in a way that aligns with the technical spirit of the present invention.

[0034] Accordingly, the embodiments described in this specification and the configurations illustrated in the drawings are merely the most preferred embodiments of the present invention and do not represent all of the technical ideas of the present invention. Therefore, it should be understood that there may be various equivalents and modified examples that can replace them at the time of filing this application.

[0035] In addition, when describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description is omitted.

[0036] Since the embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art, the shapes and sizes of components in the drawings may be exaggerated, omitted, or schematically illustrated for clearer explanation. Accordingly, the sizes and proportions of each component do not fully reflect the actual sizes or proportions.

[0037]

[0038] (Example 1)

[0039] Figure 1 illustrates a secondary battery manufacturing facility (10) according to exemplary embodiments.

[0040] According to exemplary embodiments, a secondary battery manufacturing facility (10) may include a die coater (100) and a coating roll (200). The die coater (100) may be configured to discharge a coating material. The portion of the die coater (100) through which the coating material is discharged may be referred to as a lip (100L).

[0041] According to exemplary embodiments, a die coater (100) may be configured to apply a coating material onto a current collector (SB). A coating roll (200) and a lip (100L) may face each other. The coating roll (200) and the lip (100L) may overlap each other in the discharge direction of the electrode slurry. The gap between the coating roll (200) and the lip (100L) is defined as a coating gap (CG). Depending on the coating gap (CG), the distribution and / or shape (e.g., profile) of the coating layer on the current collector (SB) may vary. Accordingly, the coating gap (CG) is one of the key process parameters for the reliability of the coating process.

[0042] The coating material may include an electrode slurry. The electrode slurry may be used in the manufacture of an electrode of a secondary battery. The electrode slurry may include an electrode active material, a conductive material, a binder, and a solvent. The electrode slurry may be manufactured by dissolving the electrode active material, the conductive material, the binder, and the like in a solvent. The solvent may disperse the electrode active material and the like. The solvent may be an aqueous solvent or a non-aqueous solvent. The solvent may include any one of dimethyl sulfoxide (DMSO), isopropyl alcohol, N-methylpyrrolidone (NMP), acetone, water, and mixtures thereof. The amount of the solvent used may be determined based on the target viscosity of the electrode slurry. Parameters determining the amount of the solvent used include the coating thickness of the electrode slurry, the manufacturing yield, and the workability.

[0043] A cathode active material is a material capable of causing an electrochemical reaction. The cathode active material may be a lithium transition metal oxide. Examples of the cathode active material include layered compounds such as lithium cobalt oxide (LiCoO2) and lithium nickel oxide (LiNiO2) substituted with one or more transition metals; lithium manganese oxide substituted with one or more transition metals; chemical formula LiNi 1-y M y Lithium nickel oxide expressed as O2 (wherein, M is any one of Co, Mn, Al, Cu, Fe, Mg, B, Cr, Zn, and Ga, and 0.01≤y≤0.7); Li 1+z Ni 1 / 3 Co 1 / 3 Mn 1 / 3 O2, Li 1+zN i 0.4 Mn 0.4 Co 0.2 Li like O2 1+z Ni b Mn c Co 1-(b+c+d) M d O (2-e) A e(wherein, -0.5≤z≤0.5, 0.1≤b≤0.8, 0.1≤c≤0.8, 0≤d≤0.2, 0≤e≤0.2, b+c+d<1, M is any one of Al, Mg, Cr, Ti, Si, and Y, and A is any one of F, P, and Cl) lithium nickel cobalt manganese composite oxide; and chemical formula Li 1+x M 1-y M' y PO 4-z X z (wherein, M is a transition metal, more specifically, one of Fe, Mn, Co, and Ni, M' is one of Al, Mg, and Ti, X is one of F, S, and N, -0.5≤x≤+0.5, 0≤y≤0.5, and 0≤z≤0.1) and may include one of the olivine-based lithium metal phosphates.

[0044] The negative active material may include carbon, such as non-graphitizable carbon, graphitic carbon, etc. The negative active material may include, for example, Li x Fe2O3(0≤x≤1), LixWO2(0≤x≤1), Sn x Me 1-x Me' y O z(wherein Me is any one of Mn, Fe, Pb and Ge, and Me' is any one of Al, B, P, Si, elements of group 1, 2 and 3 of the periodic table and halogens; 0 <x≤1 이고; 1≤y≤3 이며; 1≤z≤8) 등의 금속 복합 산화물을 포함할 수 있다. 음극 활물질은, 예컨대, 리튬 금속; 리튬 합금; 규소계 합금; 및 주석계 합금 중 어느 하나를 포함할 수 있다. 음극 활물질은, 예컨대, SnO, SnO2, PbO, PbO2, Pb2O3, Pb3O4, Sb2O3, Sb2O4, Sb2O5, GeO, GeO2, Bi2O3, Bi2O4및 Bi2O5등의 금속 산화물을 포함할 수 있다. 음극 활물질은, 예컨대, 폴리아세틸렌 등의 도전성 고분자; Li-Co-Ni 계 재료 등을 포함할 수도 있다.

[0045] The conductive material can have conductivity without causing a chemical change in the secondary battery ultimately manufactured. The conductive material may include, for example, graphite such as natural graphite or artificial graphite; carbon black such as acetylene black, Ketjen black, channel black, furnace black, lamp black, and thermal black; conductive fibers such as carbon fiber or metal fiber; metal powders such as fluorocarbon, aluminum, and nickel powder; conductive whiskey such as zinc oxide or potassium titanate; conductive metal oxides such as titanium oxide; and polyphenylene derivatives.

[0046] The binder can enhance the bonding between the active material and the conductive material and the bonding strength to the current collector. The binder can include, for example, polyvinylidene fluoride, polyvinyl alcohol, carboxymethyl cellulose (CMC), starch, hydroxypropyl cellulose, regenerated cellulose, polyvinyl pyrrolidone, tetrafluoroethylene, polyethylene, polypropylene, ethylene-propylene-dienther polymer (EPDM), sulfonated EPDM, styrene butylene rubber, fluoroelastomer, various copolymers, and the like.

[0047] The thickness of the positive electrode current collector may be in the range of about 3 μm to about 500 μm. The positive electrode current collector may not cause chemical changes in the secondary battery to be ultimately manufactured and may have high conductivity. The positive electrode current collector may include, for example, any one of stainless steel, aluminum, nickel, titanium, calcined carbon, and aluminum. The positive electrode current collector may also include stainless steel surface-treated with carbon, nickel, titanium, silver, etc. The surface of the positive electrode current collector may include a micro-roughened structure to increase the adhesion of the active material. The shape of the positive electrode current collector may include any one of a film, a sheet, a foil, a net, a porous material, a foam, and a non-woven fabric.

[0048] The thickness of the negative electrode current collector may be in the range of about 3 μm to about 500 μm. The negative electrode current collector may not cause chemical changes in the secondary battery to be ultimately manufactured and may have high conductivity. The negative electrode current collector may include any one of copper, stainless steel, aluminum, nickel, titanium, sintered carbon, and an aluminum-cadmium alloy. The negative electrode current collector may also include stainless steel surface-treated with carbon, nickel, titanium, silver, etc. The surface of the negative electrode current collector may include a micro-roughened structure to increase the adhesion of the active material. The shape of the negative electrode current collector may include any one of a film, a sheet, a foil, a net, a porous material, a foam, and a non-woven fabric.

[0049]

[0050] (Example 2)

[0051] Figures 2 and 3 are perspective views illustrating a die coater (100) according to exemplary embodiments. Figures 2 and 3 show the die coater (100) viewed from different directions.

[0052] Figures 4 to 6 are exploded perspective views illustrating a die coater (100) according to exemplary embodiments. Figures 4 to 6 show exploded perspective views of the die coater (100) viewed from different directions.

[0053] Figure 7 shows a portion (POR4) of Figure 4.

[0054] Figure 8 shows a portion (POR6) of Figure 6.

[0055] Referring to FIGS. 2 to 8, the die coater (100) may include a first die (110), a second die (120), a shim (130), and coating gap gauges (140).

[0056] The first die (110) may include a manifold (111) and an electrode slurry supply passage connected to the manifold (111). The electrode slurry may flow into the manifold (111) through the electrode slurry supply passage. The manifold (111) may be a hollow space configured to receive the electrode slurry. After the electrode slurry fills the manifold (111), the electrode slurry may be discharged to the outside of the die coater (100). The electrode slurry may be discharged to the outside through one or more slits defined by the first die (110), the second die (120), and the shim (130) from the manifold (111).

[0057] The number of slits defined by the first die (110), the second die (120), and the shim (130) can be determined by the number of retention lanes formed simultaneously by the die coater. For example, when the die coater (100) forms a single retention lane on the current collector (SB, see FIG. 1), the first die (110), the second die (120), and the shim (130) can define a single slit. As another example, when the die coater (100) forms two retention lanes on the current collector (SB, see FIG. 1) simultaneously, the first die (110), the second die (120), and the shim (130) can define two slits.

[0058] The manifold (111) may have a well shape having a predetermined depth from the land portion (113). The manifold (111) may include an inclined surface, and thus, the electrode slurry may be stably discharged from the die coater (100).

[0059] The first die (110) may include grooves (110G). The grooves (110G) may be spaced apart from each other in the Y direction. The coating gap gauges (140) may overlap the grooves (110G) in the Z direction. The coating gap gauges (140) may be at least partially inserted into the grooves (110G). The stem (141ST) and the spindle (141SP) of each of the coating gap gauges (140) may be partially inserted into a corresponding one of the grooves (110G). The tip (141T) and the tip cover (147) of each of the coating gap gauges (140) may also be inserted into a corresponding one of the grooves (110G).

[0060] The grooves (110G) of the first die (110) may have substantially the same shape as the second to fourth portions (120G2, 120G3, 120G4) of the grooves (120G) of the second die (120) described later, but are not limited thereto.

[0061] The core (130) may be interposed between the first die (110) and the second die (120). The first die (110) may be in contact with the lower surface of the core (130). The second die (120) may be in contact with the upper surface of the core (130). The upper surface of the core (130) and the lower surface of the core (130) may be opposite.

[0062] The core (130) may have a generally plate shape. The core (130) may be substantially parallel to each of the X and Y directions, and may be substantially perpendicular to the Z direction. The core (130) may include a base (130B) and wings (130W).

[0063] The base (130B) may extend in the Y direction. The base (130B) may be a plate having an X-direction width that is smaller than the Y-direction length. Here, the X-direction is a direction in which the electrode slurry is discharged, and the Y-direction may be substantially perpendicular to the X-direction. The wings (130W) may be connected to the base (130B). The wings (130W) may protrude in the X-direction from the Y-direction ends of the base (130B). The core (130) may further include gates that are connected to each of the wings (130W) and protrude in the Y-direction from the wings (130W).

[0064] The coating gap gauges (140) can be coupled to the first die (110). The coating gap gauges (140) can be fixed to the first die (110). The coating gap gauges (140) can be spaced apart from each other with a core (130) therebetween.

[0065] The coating gap gauges (140) may be substantially identical to each other. The coating gap gauges (140) may be arranged symmetrically. Each of the coating gap gauges (140) may include a gauge (141), a regulator (143), a clamp (145), a tip cover (147), and a cover regulator (149). In exemplary embodiments, each of the coating gap gauges (140) may include a dial gauge.

[0066] The gauge (141) may include a bezel (141B), a stem (141ST), a spindle (141SP), a tip (141T), a display (141D), and operating buttons (141C). The gauge (141) may also be referred to as an amplitude gauge. The coating gap (CG, see FIG. 1) measured by the gauge (141) may be displayed by the display (141D). Here, the display (141D) may include an analog display device including a scale and a needle in addition to an electronic display. The gauge (141) may be connected to a controller and / or processor via a wired / wireless communication channel, and thus, machine control (i.e., movement and alignment of the die coater (100)) may be performed so that the coating gap (CG, see FIG. 1) measured by the gauge (141) is within a target range.

[0067] The bezel (141B) may be configured to protect internal elements, such as the circuitry of the gauge (141). Each element of the gauge (141) may be assembled around the bezel (141B). For example, a capacitive absolute encoder may be built into the bezel (141B), but is not limited thereto. An analog component for detecting displacement, such as a dial, may also be built into the bezel (141B).

[0068] The spindle (141SP) can extend in the X direction. The longitudinal direction of the spindle (141SP) can be the X direction. The spindle (141SP) is a part that contacts a measurement object and detects the position of the measurement object. The spindle (141SP) can have an approximate rod shape. The position of the spindle (141SP) determined based on the position of the surface of the measurement object can be transmitted to an encoder and / or a dial. The end (i.e., the contact portion) of the spindle (141SP) can be any one of a shell type having a round end shape, a flat type having a flat end shape, and a needle type having a pointed end shape.

[0069] The tip (141T) may extend in the X direction. The longitudinal direction of the tip (141T) may be the X direction. The tip (141T) may be coupled to an end of the spindle (141SP) in the extension direction (i.e., the X direction). The tip (141T) may be a contact portion additionally provided to the spindle (141SP) of the gauge (141). Accordingly, the tip (141T) may be spaced apart from the bezel (141B) with the spindle (141SP) interposed therebetween. The width (or diameter) of the tip (141T) may be different from the width (or diameter) of the spindle (141SP). The width (or diameter) of the tip (141T) may be smaller than the width (or diameter) of the spindle (141SP). The width (or diameter) of the tip (141T) may be greater than the thickness of the shim (130), but is not limited thereto. The width (or diameter) of the tip (141T) may be smaller than the thickness of the core (130). The width (or diameter) of the tip (141T) may be equal to the thickness of the core (130).

[0070] The stem (141ST) can extend in the X direction. The longitudinal direction of the stem (141ST) can be the X direction. The stem (141ST) can connect the bezel (141B) and the spindle (141SP). The stem (141ST) can have an approximately rod shape. The stem (141ST) can be interposed between the bezel (141B) and the spindle (141SP). The width (or diameter) of the stem (141ST) can be greater than the width (or diameter) of the spindle (141SP), but is not limited thereto. The width (or diameter) of the stem (141ST) can be the same as the width (or diameter) of the spindle (141SP). In addition, the stem (141ST) and the spindle (141SP) can be integrated into a single element.

[0071] The operation buttons (141C) can be used to turn the gauge (141) on / off and adjust the zero point.

[0072] The regulator (143) may be configured to adjust the gauge (141). The regulator (143) may be configured to adjust the gauge (141) such that the gauge (141) is in an alignment mode or a coating mode. The regulator (143) may include, but is not limited to, any one of a lever, a handle, and a dial.

[0073] In the alignment mode, the tip (141T) of the gauge (141) can advance, and thus, the tip (141T) of the gauge (141) can protrude in the X direction with respect to the lip (100L, see FIG. 1). In the alignment mode, the tip (141T) of the gauge (141) can protrude in the X direction with respect to the first die (110), the second die (120) and the shim (130), and thus, the tip (141T) of the gauge (141) can contact the coating roll (200, see FIG. 1) to measure the coating gap (CG, see FIG. 1).

[0074] In the coating mode, the tip of the gauge (141) can be moved backward, and thus, the tip (141T) of the gauge (141) may not protrude relative to the lip (100L, see FIG. 1). In the alignment mode, the tip (141T) of the gauge (141) may be at a position spaced apart from the coating roll (200, see FIG. 1), and thus, damage to the collector (SB, see FIG. 1) and interference with the coating process by the tip (141T) can be prevented.

[0075] The clamp (145) may be coupled to the first die (110) by a method such as bolting. The clamp (145) may be configured to fix the gauge (141). The clamp (145) may be coupled to the stem (141ST) of the gauge (141), but is not limited thereto. For example, the clamp (145) may be coupled to the spindle (141SP) of the gauge (141), or may be coupled to the bezel (141B) of the gauge (141). The clamp (145) may include a groove (145G) into which a portion of the gauge (141), such as the stem (141ST), is inserted. The clamp (145) of each of the coating gap gauges (140) may overlap with the shim (130) in the X direction.

[0076] The tip cover (147) can overlap the stem (141ST), the spindle (141SP), and the tip (141T) in the X direction. The tip cover (147) can include a hole (147H). The tip cover (147) can allow or prevent the tip (141T) from protruding outside the die coater (100). In the alignment mode, the tip (141T) can be aligned with the hole (147H) in the X direction, thereby allowing the tip (141T) to advance toward the coating roll (200, see FIG. 1). In the coating mode, the hole (147H) can be out of alignment with the tip (141T), and the tip cover (147) can prevent the tip (141T) from protruding outside the die coater (100).

[0077] The cover adjuster (149) may be configured to adjust the position of the tip cover (147). By operating the cover adjuster (149), the hole (147H) of the tip cover (147) and the tip (141T) may be aligned so that the tip (141T) may protrude out of the die coater (100). By operating the cover adjuster (149), the hole (147H) and the tip (141T) may be spaced apart in the Y direction so that the tip cover (147) blocks the tip (141T) from protruding outward. The cover adjuster (149) may include, but is not limited to, any one of a lever, a handle, and a dial.

[0078] The second die (120) may include grooves (120G). The grooves (120G) may be spaced apart from each other in the Y direction. The coating gap gauges (140) may overlap the grooves (120G) in the Z direction. The coating gap gauges (140) may be at least partially inserted into the grooves (120G).

[0079] According to exemplary embodiments, the width (or diameter) of the spindle (141SP) and the stem (141ST) may be different from the thickness of the shim (130). According to exemplary embodiments, the width (or diameter) of the spindle (141SP) and the stem (141ST) may be greater than the thickness of the shim (130).

[0080] Each of the grooves (120G) may include a first portion (120G1), a second portion (120G2), a third portion (120G3), and a fourth portion (120G4). The first portion (120G1) may be connected to the second portion (120G2), the second portion (120G2) may be connected to the third portion (120G3), and the third portion (120G3) may be connected to the fourth portion (120G4).

[0081] The first part (120G1) can overlap with the clamp (145) in the Z direction. The clamp (145) can be inserted into the first part (120G1). The second part (120G2) can overlap with the spindle (141SP) in the Z direction. The spindle (141SP) can be inserted into the second part (120G2). The third part (120G3) can overlap with the tip (141T) in the Z direction. The tip (141T) can be inserted into the third part (120G3). The fourth part (120G4) can overlap with the tip cover (147) in the Z direction. The tip cover (147) can be inserted into the fourth part (120G4).

[0082] According to exemplary embodiments, each of the grooves (120G) may have a variable width in the Y direction. The width of the first portion (120G1) of each of the grooves (120G) in the Y direction may be different from the width of the second portion (120G2) of each of the grooves (120G) in the Y direction. The width of the first portion (120G1) of each of the grooves (120G) may be greater than the width of the second portion (120G2) of each of the grooves (120G) in the Y direction.

[0083] The width of the second portion (120G2) of each of the grooves (120G) in the Y direction may be different from the width of the third portion (120G3) of each of the grooves (120G) in the Y direction. The width of the second portion (120G2) of each of the grooves (120G) may be greater than the width of the third portion (120G3) of each of the grooves (120G) in the Y direction.

[0084] The width of the third portion (120G3) of each of the grooves (120G) in the Y direction may be different from the width of the fourth portion (120G4) of each of the grooves (120G) in the Y direction. The width of the third portion (120G3) of each of the grooves (120G) may be smaller than the width of the fourth portion (120G4) of each of the grooves (120G) in the Y direction.

[0085] According to exemplary embodiments, the clamp (145), the spindle (141SP), the tip (141T), and the tip cover (141T) may overlap with the second die (120) in the Z direction. According to exemplary embodiments, the display (141D) may not overlap with the second die (120) in the Z direction. According to exemplary embodiments, the display (141D) may be spaced apart from the second die (120) in the Y direction. According to exemplary embodiments, the display (141D) may also be spaced apart from the second die (120) in the X direction.

[0086]

[0087] The present invention has been described in more detail through drawings and examples. However, the configurations described in the drawings or examples described in this specification are merely embodiments of the present invention and do not represent all of the technical ideas of the present invention. Therefore, it should be understood that various equivalents and modified examples may exist as of the time of this application.

Claims

1. A first die including a manifold; The core on the first die; Coating gap gauges coupled to the first die; and Including a second die coupled to the first die, A die coater, characterized in that each of the coating gap measuring devices is configured to measure the distance from the lip, which is the slurry discharge portion of the first die, the shim, and the second die, to the coating roll.

2. In paragraph 1, A die coater characterized in that the above coating gap measuring devices are spaced apart from each other with the core therebetween.

3. In paragraph 1, Each of the above coating gap gauges comprises a dial gauge, and A die coater characterized in that the above dial gauge includes a bezel and a rod-shaped spindle connected to the bezel.

4. In paragraph 3, A die coater characterized in that the thickness of the core is smaller than the thickness of the spindle.

5. In paragraph 3, A die coater characterized in that the first die coater includes a groove into which the spindle is inserted.

6. In paragraph 3, A die coater, wherein each of the above coating gap gauges comprises a clamp for fixing a dial gauge to the first die.

7. In paragraph 6, The above clamp is fixed to the first die, The above clamp includes a groove, The stem of the dial gauge is inserted into the groove, and A die coater characterized in that the stem is interposed between the bezel and the spindle.

8. In paragraph 6, A die coater characterized in that the above core overlaps the clamp and the spindle in the extension direction of each of the above coating gap measuring devices.

9. In paragraph 3, A die coater, wherein each of the above coating gap gauges further comprises a tip connected to the spindle.

10. In paragraph 9, A die coater characterized in that the width of the tip is different from the width of the spindle.

11. In paragraph 9, A die coater characterized in that the width of the tip is smaller than the width of the spindle.

12. In paragraph 9, A die coater characterized in that the width of the tip is greater than the thickness of the core.

13. In paragraph 9, A die coater, wherein each of the coating gap gauges comprises a tip cover overlapping the tip in a first direction, which is an extension direction of the tip.

14. In paragraph 13, A die coater, characterized in that the tip cover includes a hole extending in the first direction.

15. In paragraph 14, A die coater, wherein each of the coating gap gauges further comprises a cover adjuster configured to adjust the position of the hole of the tip cover.

16. In paragraph 13, A die coater, wherein the second die comprises grooves overlapping the coating gap measuring devices.

17. In paragraph 16, Each of the above coating gap gauges includes a clamp for fixing a dial gauge to the first die, and A die coater, wherein each of the grooves includes a first portion overlapping the clamp.

18. In paragraph 16, A die coater, wherein each of the grooves includes a second portion overlapping the spindle.

19. In paragraph 16, A die coater, wherein each of the grooves includes a third portion overlapping the tip.

20. In paragraph 16, A die coater, wherein each of the grooves includes a fourth portion overlapping the tip cover.

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