Base plate and die coating machine comprising same

Abstract

According to an example embodiment of the present invention, a backing plate for discharging an electrode slurry in a first direction is provided. The backing plate includes: a base portion extending in a second direction perpendicular to the first direction; a spacer connected to the base and protruding from the base in a first direction; a wing portion connected to an end portion of the base portion in the second direction; and guides connected to the wings and protruding from the wings toward the divider in the second direction, in which a length of each of the guides in the second direction is in a range of 4 mm to 50 mm.

Description

Technical Field

[0001] The present invention relates to a backing plate and a die coater including the backing plate. This application claims the benefit of priority based on Korean Patent Application No. 2023-0039617, filed on Mar. 27, 2023, and the entire content of the Korean patent application is incorporated herein by reference. Background Art

[0002] Unlike primary batteries, secondary batteries can be charged and discharged multiple times. Secondary batteries have been widely used as energy sources for various types of wireless devices (e.g., mobile phones, laptop computers, and cordless vacuum cleaners). Recently, the main use of secondary batteries has evolved from mobile devices to mobility because the manufacturing cost per unit capacity of secondary batteries has decreased significantly due to improved energy density and economies of scale, and the range of battery electric vehicles (BEVs) has increased to the same level as that of fuel vehicles.

[0003] The electrodes of secondary batteries are the most important components of secondary batteries in terms of energy density. The electrodes of secondary batteries can be formed through a coating process, a rolling process, a drying process, a slitting process, and a grooving process. Among these processes, the coating process is a process of applying a slurry containing an active material to an electrode plate, and can be performed by a die coater. Summary of the Invention

[0004] Technical Problem

[0005] The present invention relates to providing a backing plate and a die coater including the backing plate with improved reliability.

[0006] Technical Solution

[0007] An exemplary embodiment of the present invention provides a backing plate configured to discharge an electrode slurry in a first direction. The backing plate includes: a base extending in a second direction perpendicular to the first direction; a separator connected to the base and protruding from the base in the first direction; a wing connected to an end of the base in the second direction; and a guide connected to the wing and protruding from the wing toward the separator in the second direction, wherein each of the guides has a length in the range of 4 mm to 50 mm in the second direction.

[0008] Each of the guides may have a length of 20 mm or less in the second direction.

[0009] Each of the guides may have a length of 10 mm or less in the second direction.

[0010] An exemplary embodiment provides a die coater. The die coater includes: a first die including a manifold to which an electrode paste is supplied; and a backing plate disposed on the first die and including a slit serving as a discharge path for the electrode paste. The backing plate may include: a base portion extending in a second direction perpendicular to a first direction along which the electrode paste is discharged; a wing portion connected to an end portion of the base portion in the second direction; and a guide member connected to the wing portion and protruding from the wing portion toward the center of the base portion in the second direction. The base portion partially covers the manifold.

[0011] The width by which the manifold is exposed from the base portion in the first direction may be in the range of 5 mm to 50 mm.

[0012] The width by which the manifold is exposed from the base portion in the first direction may be 20 mm or less.

[0013] The width by which the manifold is exposed from the base portion in the first direction may be 10 mm or less.

[0014] The length of each of the guide members in the second direction may be in the range of 4 mm to 50 mm.

[0015] The length of each of the guide members in the second direction may be 20 mm or less.

[0016] The length of each of the guide members in the second direction may be 10 mm or less.

[0017] An exemplary embodiment provides a die coater. The die coater includes: a first die including a manifold to which an electrode paste is supplied; and a backing plate disposed on the first die and including a slit serving as a discharge path for the electrode paste, wherein the backing plate includes: a base portion extending in a second direction perpendicular to a first direction along which the electrode paste is discharged; a wing portion connected to an end portion of the base portion in the second direction; and a guide member connected to the wing portion and protruding from the wing portion toward the center of the base portion in the second direction, and the length of each of the guide members in the second direction is in the range of 4 mm to 50 mm.

[0018] The length of each of the guide members in the second direction may be 10 mm or less.

[0019] The length of the base portion in the first direction may be in the range of 25 mm to 100 mm.

[0020] The length of the base portion in the first direction may be 50 mm or greater.

[0021] Advantageous Effects

[0022] According to an exemplary embodiment of the present invention, the length of each guide of the backing plate is in the range of 4 mm to 50 mm, and the width of the base portion of the backing plate is greater than the length of each guide. Accordingly, deformation of the backing plate during its fine alignment can be prevented.

[0023] The effects achievable by the exemplary embodiments of the present invention are not limited to the above effects, and other effects not described herein will be clearly derived and understood by those of ordinary skill in the art from the following description. That is, those of ordinary skill in the art can derive unanticipated effects achieved when implementing the exemplary embodiments of the present invention from the exemplary embodiments of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a perspective view of a die coater according to an exemplary embodiment.

[0025] Figure 2 is an exploded perspective view of a die coater according to an exemplary embodiment.

[0026] Figure 3 is a plan view of a backing plate.

[0027] Figure 4 shows the backing plate on a first mold.

[0028] Figure 5 is a diagram for describing the effect of a backing plate according to an exemplary embodiment.

[0029] Figure 6 is a flowchart of a method of manufacturing a secondary battery according to an exemplary embodiment.

[0030] Figure 7 is a flowchart of a method of manufacturing a secondary battery according to an exemplary embodiment. DETAILED DESCRIPTION

[0031] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Before describing the embodiments of the present invention, terms or expressions used in this specification and the claims should not be construed as being limited to those defined in a commonly understood or commonly used dictionary, and should be understood based on the meanings and concepts corresponding to the present invention in accordance with the meanings and concepts that the inventors of the present application can appropriately define the terms or expressions to best explain the principles of the present invention.

[0032] Accordingly, the embodiments described herein and the configurations shown in the drawings are merely examples of the present invention and do not reflect all the technical concepts of the present invention. Therefore, it should be understood that various equivalents and modifications of alternative configurations have been made as of the filing date of the present application.

[0033] When it is determined that the subject matter of the present invention will be obscured by unnecessary details, well-known configurations or functions related to the description of the present invention will not be described in detail.

[0034] Since the embodiments of the present invention are provided to more comprehensively explain the present invention to those of ordinary skill in the art, for clarity, the shapes, sizes, etc. of the components shown in the drawings may be enlarged, omitted, or schematically shown. Therefore, it should not be understood that the dimensions or ratios of the components completely reflect their actual dimensions or ratios.

[0035] (First Embodiment)

[0036] Figure 1 is a perspective view of a die coater 100 according to an exemplary embodiment.

[0037] Figure 2 is an exploded perspective view of a die coater 100 according to an exemplary embodiment.

[0038] Referring Figure 1 and Figure 2 , the die coater 100 may include a first die 110, a second die 120, and a backing plate 130. According to an exemplary embodiment, the die coater 100 may be configured to discharge an electrode paste. According to an exemplary embodiment, the die coater 100 may be configured to coat an electrode plate with the electrode paste.

[0039] The electrode paste may be used to fabricate an electrode of a secondary battery. The electrode paste may include an electrode active material, a conductive agent, a binder, and a solvent. The electrode paste may be prepared by dissolving the electrode active material, conductive additive, binder, etc. in the solvent. The solvent may disperse the electrode active material, etc. The solvent may be an aqueous solvent or a non-aqueous solvent. The solvent may include dimethyl sulfoxide (DMSO), isopropyl alcohol, N-methylpyrrolidone (NMP), acetone, water, or a mixture thereof. The amount of the solvent to be used may be determined based on the target viscosity of the paste. Parameters for determining the amount of the solvent to be used include the thickness of the paste to be applied, manufacturing yield, and processability.

[0040] The positive electrode active material is a material that can cause an electrochemical reaction. The positive electrode active material may be a lithium transition metal oxide. For example, the positive electrode active material may include: a layered compound substituted with one or more transition metals, for example, lithium cobalt oxide (LiCoO 2 ) or lithium nickel oxide (LiNiO 2);Lithium manganese oxides substituted by one or more transition metals; lithium nickel-based oxides represented by the chemical formula LiNi 1-y M y O 2 (where M is Co, Mn, Al, CU, Fe, Mg, B, Cr, Zn or Ga, and 0.01 ≤ y ≤ 0.7); lithium nickel cobalt manganese composite oxides represented by the chemical formula Li 1+z Ni b Mn c Co 1-(b+c+d) M d O (2-e) A, for example, Li 1+z Ni 1 / 3 Co 1 / 3 Mn 1 / 3 O 2 or Li 1+z Ni 0.4 Mn 0.4 Co 0.2 O 2 (where -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 Al, Mg, Cr, Ti, Si or Y, and A is F, P or Cl); or olivine-based lithium metal phosphates represented by the chemical formula Li 1+ x M 1-y M' y PO 4-z X z (where M is a transition metal, and more specifically Fe, Mn, Co or Ni, M' is Al, Mg or Ti, X is F, S or N, -0.5 ≤ x ≤ +0.5, 0 ≤ y ≤ 0.5, and 0 ≤ z ≤ 0.1).

[0041] The negative electrode active material may include, for example, carbon, such as non-graphitized carbon or graphite-based carbon. The negative electrode active material may include, for example, metal composite oxides, such as Li x Fe 2 O 3 (0 ≤ x ≤ 1), LixWO 2 (0 ≤ x ≤ 1) or Sn x Me 1-x Me' y O z(Here, Me is Mn, Fe, Pb, or Ge, Me' is an element from Group I, Group II, or Group III of the periodic table, Al, B, P, Si, or a halogen, 0 < x ≤ 1, 1 ≤ y ≤ 3, and 1 ≤ z ≤ 8). The negative electrode active material may include, for example, lithium metal, a lithium alloy, a silicon-based alloy, or a tin-based alloy. The negative electrode active material may include, for example, a metal oxide, such as SnO, SnO 2 2 2 2 2 2 3 3 3 4 4 2 2 3 3 4 2 5 4 2 2 3 5 4 2 2 2 3 3 2 2 3 4 4 2 2 5 3

[0042] The conductive material may not cause chemical changes in the finally manufactured secondary battery and may have electrical conductivity. For example, the conductive material may include: graphite, such as natural graphite or artificial graphite; carbon black, such as acetylene black, Ketjen black, channel black, furnace black, lamp black, or thermal black; conductive fibers, such as carbon fibers or metal fibers; metal powders, such as carbon fluoride, aluminum, or nickel powder; conductive whiskers, such as zinc oxide or potassium titanate; conductive metal oxides, such as titanium oxide; polyphenylene derivatives; and so on.

[0043] The binder may enhance the binding force between the active material and the conductive additive and the binding force of the electrode plate. The binder may include, for example, polyvinylidene fluoride, polyvinyl alcohol, carboxymethyl cellulose (CMC), starch, hydroxypropyl cellulose, regenerated cellulose, polyvinylpyrrolidone, tetrafluoroethylene, polyethylene, polypropylene, ethylene-propylene-diene terpolymer (EPDM), sulfonated EPDM, styrene-butene rubber, fluororubber, various copolymers, and so on.

[0044] The sheet-like electrode may be formed by applying an electrode paste containing the electrode active material onto an electrode plate and drying and rolling the electrode paste to form an electrode mixture layer. The electrode paste may be applied onto the electrode plate by a die coater. The die coater may be, for example, a slot die. The electrode plate may be a positive electrode plate or a negative electrode plate, and the electrode active material may be a positive electrode active material or a negative electrode active material.

[0045] The thickness of the positive electrode plate may be in the range of about 3 μm to about 500 μm. The positive electrode plate may not cause chemical changes in the finally manufactured secondary battery and may have high electrical conductivity. The positive electrode plate may include, for example, stainless steel, nickel, titanium, sintered carbon, or aluminum. The positive electrode plate may include stainless steel surface-treated with carbon, nickel, titanium, silver, etc. The surface of the positive electrode plate may include a fine concavo-convex structure to improve the adhesion of the active material. The positive electrode plate may be in the form of a film, sheet, foil, or mesh, a porous form, or a foam or non-woven fabric form.

[0046] The thickness of the negative electrode plate may be in the range of about 3 μm to about 500 μm. The negative electrode plate may not cause chemical changes in the finally manufactured secondary battery and may have high electrical conductivity. The negative electrode plate may include copper, stainless steel, aluminum, nickel, titanium, sintered carbon, or an aluminum-cadmium alloy. The negative electrode plate may include stainless steel surface-treated with carbon, nickel, titanium, silver, etc. The surface of the negative electrode plate may include a fine concavo-convex structure to improve the adhesion of the active material. The negative electrode plate may be in the form of a film, sheet, foil, or mesh, a porous form, or a foam or non-woven fabric form.

[0047] The spacer plate 130 may be interposed between the first mold 110 and the second mold 120. The first mold 110 may be in contact with the lower surface of the spacer plate 130. The second mold 120 may be in contact with the upper surface of the spacer plate 130.

[0048] Hereinafter, the technical concept of the present invention will be described with respect to an embodiment in which the first mold 110 and the second mold 120 are separate elements as described above. Based on the description herein, those of ordinary skill in the art will be able to easily derive an embodiment in which the first mold 110 and the second mold 120 are integrated to form an integral mold.

[0049] According to an exemplary embodiment, the first mold 110 and the second mold 120 may have symmetric shapes with respect to each other. According to an exemplary embodiment, each of the first mold 110 and the second mold 120 may have a substantially four-sided pyramid shape, but is not limited thereto.

[0050] The first mold 110 may include a manifold 111 and holes 110H connected to the manifold 111. The electrode paste may flow into the manifold 111 through the holes 110H. After the manifold 111 is filled with the electrode paste, the electrode paste may be discharged to the outside of the die coater 100. The electrode paste may be discharged from the manifold 111 to the outside through the slits 130S1 and 130S2 in the spacer plate 130.

[0051] The manifold 111 may have a well shape at a certain depth from the upper surface of the first mold 110. The manifold 111 may include a first side 111S1 and a second side 111S2 that are substantially parallel to each other. The first side 111S1 may be in the direction in which the electrode paste is discharged. The second side 111S2 may be opposite to the first side 111S1. The manifold 111 may include an inclined surface connected to the first side 111S1, and thus the electrode paste may be stably discharged from the die coater 100.

[0052] (Second Embodiment)

[0053] Figure 3 is a plan view of the backing plate 130.

[0054] Figure 4 Shows the backing plate 130 on the first mold 110.

[0055] Reference Figure 3 and Figure 4 , the backing plate 130 is placed on the first mold 110.

[0056] Referring to Figure 3 , the backing plate 130 may include a base 131, a separator 133, a wing 135, and a guide 137.

[0057] The X-axis direction may be the direction in which the electrode paste is discharged. The Y-axis direction may be substantially perpendicular to the X-axis direction. The Z-axis direction may be substantially perpendicular to the X-axis direction and the Y-axis direction. The Z-axis direction may be the thickness direction of the backing plate 130.

[0058] According to an exemplary embodiment, the base 131 may extend in the Y-axis direction. The Y-axis direction may be referred to as the longitudinal direction of the base 131. The base 131 may partially overlap the manifold 111 in the Z-axis direction. The base 131 may partially cover the manifold 111 in the Z-axis direction.

[0059] According to an exemplary embodiment, the separator 133 may be connected to the base 131. The separator 133 may protrude from the base 131 in the X-axis direction. As a non-limiting example, the separator 133 may be located at the central portion of the base 131 in the Y-axis direction. The separator 133 may separate the slit 130S1 and the slit 130S2. The area for discharging the paste may be separated by the separator 133.

[0060] According to an exemplary embodiment, the backing plate 130 may include two or more separators and three or more slits resulting from the two or more separators. In this case, the two or more separators may divide the space between the guides 137 into equal parts to provide slits having substantially the same width in the Y-axis direction.

[0061] According to an exemplary embodiment, the wing portion 135 may be connected to opposite ends of the base portion 131 in the Y-axis direction. The length of the wing portion 135 in the X-axis direction may be greater than the length L1 of the base portion 131 in the X-axis direction. The side surface of the wing portion 135 perpendicular to the X-axis direction may form a common surface CS with the side surface of the base portion 131 perpendicular to the X-axis direction. The common surface CS may be opposite to the portion of the backing plate 130 where the slits 130S1 and 130S2 are formed.

[0062] According to an exemplary embodiment, the guide member 137 may protrude from the wing portion 135 in the Y-axis direction. The width of each of the slits 130S1 and 130S2 in the Y-axis direction may be determined by the guide member 137. The width of the entire region of the electrode plate where the electrode paste is applied may be determined by the length L2 of the guide member 137.

[0063] According to an exemplary embodiment, the length L1 of the base portion 131 in the X-axis direction may be in the range of about 25 mm to about 100 mm. According to an exemplary embodiment, the length L1 of the base portion 131 in the X-axis direction may be about 30 mm or greater. According to an exemplary embodiment, the length L1 of the base portion 131 in the X-axis direction may be about 35 mm or greater. According to an exemplary embodiment, the length L1 of the base portion 131 in the X-axis direction may be about 40 mm or greater. According to an exemplary embodiment, the length L1 of the base portion 131 in the X-axis direction may be about 45 mm or greater. According to an exemplary embodiment, the length L1 of the base portion 131 in the X-axis direction may be about 50 mm or greater. According to an exemplary embodiment, the length L1 of the base portion 131 in the X-axis direction may be about 55 mm or greater. According to an exemplary embodiment, the length L1 of the base portion 131 in the X-axis direction may be about 60 mm or greater. According to an exemplary embodiment, the length L1 of the base portion 131 in the X-axis direction may be about 65 mm or greater. According to an exemplary embodiment, the length L1 of the base portion 131 in the X-axis direction may be about 70 mm or greater.

[0064] According to an exemplary embodiment, the length L2 of each guide member 137 in the Y-axis direction may be in the range of about 4 mm to about 50 mm. According to an exemplary embodiment, the length L2 of each guide member 137 in the Y-axis direction may be about 45 mm or less. According to an exemplary embodiment, the length L2 of each guide member 137 in the Y-axis direction may be about 40 mm or less. According to an exemplary embodiment, the length L2 of each guide member 137 in the Y-axis direction may be about 35 mm or less. According to an exemplary embodiment, the length L2 of each guide member 137 in the Y-axis direction may be about 30 mm or less. According to an exemplary embodiment, the length L2 of each guide member 137 in the Y-axis direction may be about 25 mm or less. According to an exemplary embodiment, the length L2 of each guide member 137 in the Y-axis direction may be about 20 mm or less. According to an exemplary embodiment, the length L2 of each guide member 137 in the Y-axis direction may be about 15 mm or less. According to an exemplary embodiment, the length L2 of each guide member 137 in the Y-axis direction may be about 10 mm or less. According to an exemplary embodiment, the length L2 of each guide member 137 in the Y-axis direction may be about 5 mm or less.

[0065] According to an exemplary embodiment, the distance D between the base 131 and the first side 111S1 of the manifold 111 in the X-axis direction may be in the range of 5 mm to 50 mm. Experimental examples reveal that when the distance D between the base 131 and the first side 111S1 of the manifold 111 in the X-axis direction is 5 mm or greater, the discharge performance when using the die coater 100 (see Figure 1 ) is not restricted by the backing plate 130. The experimental examples also reveal that when the distance D between the base 131 and the first side 111S1 of the manifold 111 in the X-axis direction is less than 5 mm, the discharge performance when using the die coater 100 (see Figure 1 ) deteriorates. The distance D between the base 131 and the first side 111S1 of the manifold 111 in the X-axis direction may be equal to the width of the manifold 111 exposed by the base 131 in the X-axis direction.

[0066] According to an exemplary embodiment, the distance D in the X-axis direction between the base 131 and the first side 111S1 of the manifold 111 may be 45 mm or less. According to an exemplary embodiment, the distance D in the X-axis direction between the base 131 and the first side 111S1 of the manifold 111 may be 40 mm or less. According to an exemplary embodiment, the distance D in the X-axis direction between the base 131 and the first side 111S1 of the manifold 111 may be 35 mm or less. According to an exemplary embodiment, the distance D in the X-axis direction between the base 131 and the first side 111S1 of the manifold 111 may be 30 mm or less. According to an exemplary embodiment, the distance D in the X-axis direction between the base 131 and the first side 111S1 of the manifold 111 may be 25 mm or less. According to an exemplary embodiment, the distance D in the X-axis direction between the base 131 and the first side 111S1 of the manifold 111 may be 20 mm or less. According to an exemplary embodiment, the distance D in the X-axis direction between the base 131 and the first side 111S1 of the manifold 111 may be 15 mm or less. According to an exemplary embodiment, the distance D in the X-axis direction between the base 131 and the first side 111S1 of the manifold 111 may be 10 mm or less.

[0067] After the backing plate 130 is disposed on the first mold 110, the backing plate 130 may be finely aligned for precise coating. A backing plate of the related art may be deformed due to a lack of rigidity during fine alignment. Here, the longer each guide in the Y-axis direction and the shorter the base in the X-axis direction, the more easily the backing plate is deformed. Since the backing plate is an expensive product that is precisely manufactured, frequent deformation of the backing plate significantly increases the production cost of the secondary battery.

[0068] According to an exemplary embodiment, deformation of the backing plate 130 can be prevented because the length L2 of each guide 137 in the Y-axis direction is in the range of about 4 mm to about 50 mm, and the distance D in the X-axis direction between the base 131 and the first side 111S1 of the manifold 111 is in the range of 5 mm to 50 mm. Accordingly, the reliability of the die coater 100 and the economic feasibility of the coating process can be improved.

[0069] Figure 5 is a graph for describing the effect of the backing plate according to an exemplary embodiment. In Figure 5 the horizontal axis represents the position along the Y-axis direction on the die coater, and the vertical axis represents the discharge rate. The position and the discharge rate are represented in arbitrary units (a.u.).

[0070] Referring to Figure 3 and Figure 5, it was confirmed that the discharge rate-position distribution in the experimental example where the length L2 of each guide member 137 in the Y-axis direction was 4 mm was substantially the same as the discharge rate-position distribution in the comparative example where the length of each guide member in the Y-axis direction was 150 mm. According to the exemplary embodiment, by sufficiently reducing the length L2 of each guide member 137 in the Y-axis direction, the mechanical reliability of the backing plate 130 can be improved without changing the discharge rate characteristics.

[0071] (Third Embodiment)

[0072] Figure 6 is a flowchart of a method for manufacturing a secondary battery according to an exemplary embodiment.

[0073] Figure 7 is a flowchart of a method for manufacturing a secondary battery according to an exemplary embodiment.

[0074] Refer to Figure 6 and Figure 7 , in P110, the electrode plate EP can be coated with the electrode paste SL. Coating the electrode plate EP with the electrode paste SL can be performed by the die coater 100 described above with reference to Figures 1 to 4 . Coating the electrode plate EP with the electrode paste SL can be performed by a roll-to-roll method as shown in Figure 7 , but the embodiment is not limited thereto. For example, the electrode plate EP moving on a belt can be coated with the electrode paste SL by a stationary die coater 100, or the electrode plate EP on a stationary support can be coated with the electrode paste by a moving die coater 100.

[0075] In the roll-to-roll method, the electrode plate EP transferred and pressed by the roller RL can be coated with the electrode paste SL by the die coater 100. Thus, a sheet-type electrode EL can be provided.

[0076] Next, in P120, a roll pressing process can be performed. The roll pressing process can be performed by a roll pressing device. The roll pressing device can include a plurality of rolls for applying pressure to the sheet-type electrode EL. The sheet-type electrode EL can be thinned and flattened by the plurality of rolls. By performing the roll pressing process, the bonding force between the surface of the electrode plate EP and the active material can be enhanced. Due to the enhancement of the bonding force between the surface of the electrode plate EP and the active material, the movement of lithium ions between the electrode EL and the active material can be promoted, and the power and performance of the finally manufactured secondary battery can be improved.

[0077] Next, in P130, the electrode EL can be dried. The drying process of the electrode EL can be performed in a drying chamber. The drying process of the electrode EL can be carried out by supplying dry air into the drying chamber or by supplying heat energy to the electrode EL in the drying chamber through infrared rays, hot air, etc. In the drying process, the uniformity and reliability of the electrode EL can be improved by removing moisture from the electrode EL.

[0078] Next, in P140, a slitting process can be performed. The slitting process is a process of dividing the electrode EL into multiple electrodes. The slitting process can be performed by a slitting device. The slitting device can include a slitting knife for dividing the electrode EL into multiple electrodes. Thereafter, the electrode EL can be slit into a shape with tabs through a slitting process.

[0079] The present invention has been described in more detail above with reference to the drawings, embodiments, etc. However, the configurations shown in the drawings or embodiments described in this specification are only embodiments of the present invention and do not reflect all the technical concepts of the present invention. Therefore, it should be understood that various equivalents and modifications of alternative configurations have been made as of the filing date of this application.

Claims

1. A backing plate, the backing plate being configured to discharge electrode slurry along a first direction, the backing plate comprising: a base extending in a second direction perpendicular to the first direction; a divider connected to the base and protruding from the base in the first direction; a wing portion connected to an end portion of the base portion in the second direction; as well as a guide connected to the wing and protruding from the wing toward the partition in the second direction, Wherein, a length of each of the guides in the second direction is in a range of 4 mm to 50 mm.

2. The backing plate according to claim 1, wherein: A length of each of the guides in the second direction is 20 mm or less.

3. The backing plate according to claim 1, wherein: A length of each of the guides in the second direction is 10 mm or less.

4. A die coating machine, comprising: a first die, the first die comprising a manifold to which the electrode slurry is supplied; as well as a backing plate disposed on the first mold and including a slit as a discharge path for the electrode slurry, Wherein, the pad includes: a base extending in a second direction, the second direction being perpendicular to the first direction along which the electrode slurry is discharged; a wing portion connected to an end portion of the base portion in the second direction; and a guide connected to the wing and protruding from the wing toward the center of the base in the second direction, and The base partially covers the manifold.

5. The die coating machine according to claim 4, wherein: A width of the manifold exposed from the base in the first direction is in a range of 5 mm to 50 mm.

6. The die coating machine according to claim 5, wherein: The width of the manifold exposed from the base in the first direction is 20 mm or less.

7. The die coating machine according to claim 5, wherein: The width of the manifold exposed from the base in the first direction is 10 mm or less.

8. The die coating machine according to claim 4, wherein: A length of each of the guides in the second direction is in a range of 4 mm to 50 mm.

9. The die coating machine according to claim 8, wherein: A length of each of the guides in the second direction is 20 mm or less.

10. The die coating machine according to claim 8, wherein A length of each of the guides in the second direction is 10 mm or less.

11. A die coating machine, comprising: a first die, the first die comprising a manifold to which the electrode slurry is supplied; as well as a backing plate disposed on the first mold and including a slit as a discharge path for the electrode slurry, Wherein, the pad includes: a base extending in a second direction, the second direction being perpendicular to the first direction along which the electrode slurry is discharged; a wing portion connected to an end portion of the base portion in the second direction; and a guide connected to the wing and protruding from the wing toward the center of the base in the second direction, and A length of each of the guides in the second direction is in a range of 4 mm to 50 mm.

12. The die coating machine according to claim 11, wherein A length of each of the guides in the second direction is 10 mm or less.

13. The die coating machine according to claim 11, wherein A length of the base in the first direction is in a range of 25 mm to 100 mm.

14. The die coating machine according to claim 13, wherein: The length of the base in the first direction is greater than or equal to 50 mm.

Images