Die coater

Abstract

According to exemplary embodiments, a die coater is provided. The die coater comprises: a first die including a land part and a manifold, which has a predetermined depth from the land part and accommodates an electrode slurry; a second die coupled to the first die; and a shim which is interposed between the first die and the second die, and which includes a spacer shim extending in a first direction and a body shim extending in a second direction perpendicular to the first direction, wherein the spacer shim includes: an insulating liquid inlet; first and second insulating flow paths connected to the insulating liquid inlet; and a first adjuster so as to adjust the amount of the insulating liquid discharged by means of the first insulating flow path.

Description

Die coater

[0001] The present invention relates to a die coater.

[0002] This application claims the benefit of priority from Republic of Korea Patent Application No. 10-2024-0051288, filed April 17, 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 polarizing plate, 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 coating performance.

[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 land portion and a manifold configured to receive electrode slurry at a predetermined depth from the land portion; a second die coupled to the first die; a shim including a spacer shim interposed between the first die and the second die and extending in a first direction and a body shim extending in a second direction perpendicular to the first direction, wherein the spacer shim includes an insulating liquid inlet and first and second insulating channels connected to the insulating liquid inlet; and a first regulator for regulating a discharge amount of insulating liquid through the first insulating channel.

[0007] The above first regulator is a bolt.

[0008] The first regulator is configured to move toward the first insulating path.

[0009] The above first regulator is configured to adjust the cross-sectional area of ​​the first insulating passage.

[0010] The above first regulator is coupled to the second die.

[0011] The second die includes a fastening hole overlapping the first insulating filament.

[0012] The above first regulator is configured to adjust the cross-sectional area of ​​the first insulating passage.

[0013] A second regulator configured to regulate the second insulation flow is included.

[0014] According to exemplary embodiments, a method of manufacturing a secondary battery is provided. The method includes the steps of: adjusting a cross-sectional area of ​​a first insulating path of a spacer core interposed between first and second dies; and providing an electrode slurry and an insulating slurry on an electrode sheet.

[0015] The cross-sectional area of ​​the first insulation passage is adjusted so that the discharge amount of the insulation slurry through the first insulation passage and the discharge amount of the insulation slurry through the second insulation passage of the spacer core are the same.

[0016] The first die includes a land portion and a manifold, the second die includes a fastening hole overlapping the first insulating passage, and the cross-sectional area of ​​the first insulating passage is controlled by operation of a regulator coupled to the second die.

[0017] The above regulator is configured to move toward the first insulating filament.

[0018] According to exemplary embodiments of the present invention, the cross-sectional area of ​​the insulating channels of the spacer core can be adjusted. Accordingly, uneven discharge of the insulating liquid caused by unevenness of the insulating channels of the spacer can be prevented, and the yield and reliability of the coating process can be improved.

[0019] 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.

[0020] Figure 1 illustrates a secondary battery manufacturing facility according to exemplary embodiments.

[0021] Figure 2 is an exploded perspective view illustrating a die coater according to exemplary embodiments.

[0022] Figure 3 shows a portion of Figure 2.

[0023] Figure 4 shows a portion of Figure 2.

[0024] Figure 5 shows a portion of Figure 2.

[0025] Figure 6 is a cross-sectional view of a die coater according to exemplary embodiments.

[0026] Figure 7 shows the layout of the spacer cores and regulator.

[0027] FIG. 8 is a flowchart illustrating a method for manufacturing a secondary battery according to exemplary embodiments.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032]

[0033] (Example 1)

[0034] Figure 1 illustrates a secondary battery manufacturing facility (10) according to exemplary embodiments.

[0035] According to exemplary embodiments, the secondary battery manufacturing facility (10) may include a die coater (100) and rolls (200). The die coater (100) may be configured to discharge a coating material. A portion of the die coater (100) from which the coating material is discharged may be referred to as a lip (100L). According to exemplary embodiments, the die coater (100) may be configured to apply a coating material onto a current collector (SB). The coating material may include electrode slurry and insulating slurry. The die coater (100) may be configured to simultaneously provide the electrode slurry and the insulating slurry onto the current collector (SB).

[0036] An electrode slurry can be used in the manufacture of an electrode of a secondary battery. The electrode slurry can include an electrode active material, a conductive material, a binder, and a solvent. The electrode slurry can be manufactured by dissolving the electrode active material, the conductive material, the binder, etc. in a solvent. The solvent can disperse the electrode active material, etc. The solvent can be an aqueous solvent or a non-aqueous solvent. The solvent can include any one of dimethyl sulfoxide (DMSO), isopropyl alcohol, N-methylpyrrolidone (NMP), acetone, water, and mixtures thereof. The amount of the solvent used can 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] The binder can enhance the bonding between the active material and the conductive material and the bonding strength to the electrode plate. 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-diene terpolymer (EPDM), sulfonated EPDM, styrene butylene rubber, fluoroelastomer, various copolymers, etc.

[0041] 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, or the like. 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.

[0042] 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.

[0043]

[0044] (Example 2)

[0045] FIG. 2 is an exploded perspective view illustrating a die coater (100) according to exemplary embodiments.

[0046] Figure 3 shows a portion (POR1) of Figure 2.

[0047] Figure 4 shows a portion (POR2) ​​of Figure 2.

[0048] Figure 5 shows a portion (POR3) of Figure 2.

[0049] FIG. 6 is a cross-sectional view of a die coater (100) according to exemplary embodiments.

[0050] Figure 7 shows the layout of the spacer cores (135, 137) and the regulator (150).

[0051] Referring to FIG. 2, the die coater (100) may include a first die (110), a second die (120), a shim (130), shim fixators (141), shim fixing pins (143), and regulators (150).

[0052] Hereinafter, the technical concept of the present invention will be described based on an embodiment in which the first die (110) and the second die (120) are separate elements, as described above. Those skilled in the art will readily be able to arrive at an embodiment in which the first die (110) and the second die (120) are integrated to form an integrated die, based on the description herein.

[0053] The first die (110) may include a manifold (111) and an electrode slurry supply path connected to the manifold (111). The electrode slurry may flow into the manifold (111) through the electrode slurry supply path. 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 slits defined by the shim (130) and the land portion (113) from the manifold (111).

[0054] 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).

[0055] 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 core (130) may include a body core (131) and spacer cores (133, 135, 137).

[0056] The body core (131) may include a body (131B) and wings (131W). The body (131B) may extend in the Y direction. The body (131B) may be a plate having a width in the X direction that is smaller than a length in the Y direction. 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 body core (131) may be substantially parallel to each of the X direction and the Y direction, and may be substantially perpendicular to the Z direction. The wings (131W) may be connected to an end of the body (131B) in the Y direction. The wings (131W) may protrude from the body (131B) in the X direction.

[0057] The body (131B) may include a plurality of grooves (131G). Each of the plurality of grooves (131G) may be located on a side of the body (131B) parallel to the Y direction, adjacent to the manifold (111) (e.g., overlapping the manifold (111)). Each of the plurality of grooves (131G) may be recessed inward from the sides of the body (131B) parallel to the Y direction.

[0058] A plurality of grooves (131G) may correspond to a plurality of spacer shims (133, 135, 137). The plurality of grooves (131G) may expose a portion of the first die (110). The plurality of spacer shims (133, 135, 137) may be partially inserted into a corresponding one of the plurality of grooves (131G). The plurality of spacer shims (133, 135, 137) may be fixed to the portion of the first die (110) exposed by the plurality of grooves (131G) by a method such as bolting.

[0059] According to exemplary embodiments, the Y-direction width of each of the plurality of grooves (131G) may be different from the Y-direction width of a corresponding one of the spacer shims (133, 135, 137). According to exemplary embodiments, the Y-direction width of each of the plurality of grooves (131G) may be larger than the Y-direction width of a corresponding one of the spacer shims (133, 135, 137). Accordingly, the plurality of grooves (131G) guide the coupling of the spacer shims (133, 135, 137) while providing the spacer shims (133, 135, 137) with a degree of freedom in the Y-direction, so that the positions of the spacer shims (133, 135, 137) can be precisely adjusted in the Y-direction.

[0060] The spacer cores (133, 135, 137) can be interposed between the wings (131W) in the Y direction. The spacer cores (133, 135, 137) can overlap the wings (131W) in the Y direction.

[0061] Referring to FIGS. 2 and 3 , according to exemplary embodiments, the spacer seams (133) may be adjacent to the Y-direction edges of the seam (130). According to exemplary embodiments, the spacer seams (133) may be adjacent to the wings (131W). According to exemplary embodiments, the spacer seams (133) may be in contact with the wings (131W), but are not limited thereto. Each of the spacer seams (133) may be referred to as an edge spacer seam or a first spacer seam.

[0062] Each of the spacer cores (133) may include an inlet (133FI) and an insulating passage (133F). The insulating passage (133F) may be connected to the inlet (133FI). The first die (110) may be connected to an insulating slurry supply line, and the insulating slurry flowing through the passage within the first die (110) may be introduced into the insulating passage (133F) through the inlet (133FI). The inlet (133FI) may have a wider width than the insulating passage (133F) to ensure a stable supply of the insulating slurry. The insulating passage (133F) may provide a passage for the flow of the insulating slurry. Here, the insulating slurry may be a material having insulating properties and fluidity.

[0063] An insulating slurry may be provided on a current collector (SB, see FIG. 1) through an insulating conduit (133F), and thus, an insulating slurry may be provided that covers an edge of electrode slurry discharged from portions of a manifold (111) between spacer shims (133) and spacer shims (137). According to exemplary embodiments, since the insulating slurry covers the edge of the electrode slurry, an edge profile of the electrode slurry may be improved, and yield and reliability of a secondary battery manufacturing process may be enhanced. Each of the spacer shims (133) may be matched with one slit for discharging the electrode slurry, and thus, each of the spacer shims (133) may include one insulating conduit (133F).

[0064] Referring to FIGS. 2 and 4, according to exemplary embodiments, the spacer core (135) may be positioned at the center of the core (130) in the Y direction. According to exemplary embodiments, the spacer core (135) may be interposed between the spacer cores (133). The spacer core (135) may be referred to as a center spacer core or as a second spacer core.

[0065] The spacer core (135) may include an inlet (135FI) and first and second insulating passages (135F1, 135F2). The first and second insulating passages (135F1, 135F2) may be connected to the inlet (135FI). Insulating slurry may be introduced into the first and second insulating passages (135F1, 135F2) through the inlet (135FI). The inlet (135FI) may have a width greater than that of each of the first and second insulating passages (135F1, 135F2) for stable supply of the insulating slurry. The first and second insulating passages (135F1, 135F2) may provide a path for the flow of the insulating slurry.

[0066] Insulating slurry may be provided through first and second insulating passages (135F1, 135F2) on the current collector (SB, see FIG. 1), and thus insulating slurry may be provided to cover the edge of the electrode slurry discharged from portions of the manifold (111) between the spacer shim (135) and the spacer shims (137). The spacer shim (135) may be matched with two slits for discharging the electrode slurry, and thus the spacer shim (135) may include two insulating passages (135F1, 135F2).

[0067] Referring to FIGS. 2 and 5, according to exemplary embodiments, spacer cores (137) may be interposed between spacer cores (133) and spacer cores (135). Each of the spacer cores (137) may be referred to as an intermediate spacer core or a third spacer core.

[0068] Each of the spacer cores (137) may include an inlet (137FI) and first and second insulating passages (137F1, 137F2). The first and second insulating passages (137F1, 137F2) may be connected to the inlet (137FI). Insulating slurry may be introduced into the first and second insulating passages (137F1, 137F2) through the inlet (137FI). The inlet (137FI) may have a width greater than that of each of the first and second insulating passages (137F1, 137F2) for stable supply of the insulating slurry. The first and second insulating passages (137F1, 137F2) may provide a path for the flow of the insulating slurry.

[0069] Insulating slurry may be provided through first and second insulating passages (137F1, 137F2) on the current collector (SB, see FIG. 1), and insulating slurry may be provided to cover the edge of the electrode slurry discharged from a portion of the manifold (111) between the spacer shim (133) and the spacer shim (137) and a portion of the manifold (111) between the spacer shim (135) and the spacer shim (137). Each of the spacer shims (137) may be matched with two slits for discharging the electrode slurry, and thus each of the spacer shims (137) may include two insulating passages (137F1, 137F2).

[0070] The spacer shims (133, 135, 137) can partially cover the manifold (111). The spacer shims (133, 135, 137) can overlap the manifold (111) in the Z direction. In FIG. 3, the spacer shims (133, 135, 137) can divide the manifold (111) into four regions, and accordingly, the die coater (100) can be configured to form four maintenance lanes simultaneously through one coating process.

[0071] One skilled in the art will readily arrive at die coaters configured to form various numbers of retention lanes, such as, for example, 1, 2, 8, 16, and 32, based on the description herein. For example, a die coater configured to form 8 retention lanes may include a shim comprising 2 edge spacer shims, 1 center spacer shim, and 6 middle spacer shims.

[0072] Referring to FIGS. 2 to 5, the core fixing members (141) and the core fixing pins (143) can be partially inserted into the land portion (113) of the first die (110). The core fixing members (141) and the core fixing pins (143) can be configured to fix the spacer cores (133) to the land portion (113) of the first die (110).

[0073] The core fixing members (141) may be, for example, bolts, but are not limited thereto. The core fixing pins (143) may be, for example, bidirectional pins. Accordingly, the core fixing pins (143) may be configured to fix the second die (120) to the core (130) in addition to the first die (110). Each of the spacer cores (133, 135, 137) may include a fastening hole corresponding to the core fixing members (141) and the core fixing pins (143) (i.e., the core fixing members (141) and the core fixing pins (143) are inserted into, and are penetrated by the core fixing members (141) and the core fixing pins (143).

[0074] Referring to FIGS. 2, 6, and 7, the regulators (150) can be coupled to the second die (120). The regulators (150) can be inserted into the second die (120). According to exemplary embodiments, the regulators (150) can be mechanical fastening means such as bolts, and the second die (120) can include fastening holes (120H) for insertion of the regulators (150). The fastening holes (120H) can include screw threads. Each of the fastening holes (120H) can overlap in the Z direction with any one of the first and second insulating passages (135F1, 135F2) and the first and second insulating passages (137F1, 137F2).

[0075] The regulators (150) can be configured to move in the Z direction by means of operations such as bolting. The regulators (150) can be configured to approach or move away from any one of the first and second insulating passages (135F1, 135F2) and the first and second insulating passages (137F1, 137F2). Accordingly, the regulators (150) can be configured to control the flow area of ​​a corresponding one of the first and second insulating passages (135F1, 135F2) and the first and second insulating passages (137F1, 137F2).

[0076] The flow areas of the first and second insulating passages (135F1, 135F2) and the first and second insulating passages (137F1, 137F2) can be defined by the spacer cores (135, 137) and the regulators (155). As the regulators (150) move toward the first and second insulating passages (135F1, 135F2) and the first and second insulating passages (137F1, 137F2), the flow areas of the first and second insulating passages (135F1, 135F2) and the first and second insulating passages (137F1, 137F2) can be reduced. By moving the regulators (150) away from the first and second insulating passages (135F1, 135F2) and the first and second insulating passages (137F1, 137F2), the flow area of ​​the first and second insulating passages (135F1, 135F2) and the first and second insulating passages (137F1, 137F2) can be increased.

[0077] The spacer cores (135, 137) are produced through a precise manufacturing process, but there may still be unavoidable errors in the first and second insulating filaments (135F1, 135F2) and the first and second insulating filaments (137F1, 137F2).

[0078] The difference in the flow area between the first and second insulating passages (135F1, 135F2) and the difference in the flow area between the first and second insulating passages (137F1, 137F2) may cause a deviation in the insulation thickness applied to the edge portion of the electrode slurry, which may lower the reliability of secondary battery manufacturing.

[0079] According to exemplary embodiments, by controlling the flow areas of the first and second insulating channels (135F1, 135F2) and the first and second insulating channels (137F1, 137F2) using the controllers (150), the manufacturing error of the spacer cores (135, 137) can be compensated for, thereby improving the reliability of secondary battery manufacturing.

[0080] One skilled in the art will readily be able to arrive at embodiments that include only some of the regulators (150) based on what is described herein. For example, the regulators (150) may be provided in only one of the first and second insulating passages (135F1, 135F2) of the spacer shim (135), or the regulators (150) may be provided in only one of the first and second insulating passages (137F1, 137F2) of each of the spacer shims (137).

[0081] As in FIG. 2, if the core (130) includes two middle spacer cores and one center spacer core, there are three cases in which at least one regulator (150) corresponds to each of the middle spacer cores, and there are also three cases in which at least one regulator (150) corresponds to the center spacer core, so that an additional 26 modified embodiments are possible in addition to FIG. 2.

[0082]

[0083] (Example 3)

[0084] Figure 8 is a flowchart illustrating a method for manufacturing a secondary battery according to exemplary embodiments.

[0085] Referring to FIGS. 1, 2 and 8, at P110, the controllers (150) can be manipulated. The controllers (150) can be manipulated to move toward the land portion (113) exposed by the first and second insulating passages (135F1, 135F2) and the first and second insulating passages (137F1, 137F2). By manipulating the controllers (150), the passage cross-sectional areas of the first and second insulating passages (135F1, 135F2) and the first and second insulating passages (137F1, 137F2) can be adjusted.

[0086] The cross-sectional areas of the first and second insulating passages (135F1, 135F2) can be adjusted so that the discharge amount of insulating slurry through the first insulating passages (135F1) and the discharge amount of insulating slurry through the second insulating passages (135F2) are the same. Similarly, the cross-sectional areas of the first and second insulating passages (137F1, 137F2) can be adjusted so that the discharge amount of insulating slurry through the first insulating passages (137F1) and the discharge amount of insulating slurry through the second insulating passages (137F2) are the same.

[0087] Next, a coating process can be performed at P120. The coating process is substantially the same as that described with reference to Fig. 1, so a redundant description thereof will be omitted.

[0088] After the coating process, a roll press process, a drying process, a slitting process, and a notching process may be performed. The roll press process may be performed using a roll press device including pressure rolls. The roll press process can strengthen the bonding between the surface of the electrode and the active material. Accordingly, the movement of lithium ions within the electrode can be promoted, and the output and performance of the ultimately manufactured secondary battery can be improved.

[0089] The drying process of the electrode may include supplying dry air into a drying chamber or supplying thermal energy to the electrode within the chamber, such as infrared rays or high-temperature air. The drying process can improve the uniformity and reliability of the electrode by removing moisture from the electrode.

[0090] The slitting process separates an electrode into multiple electrodes with smaller widths in the transverse direction. The electrode can then be cut into a shape including tabs by a notching process.

[0091] 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 land portion and a manifold configured to receive electrode slurry at a predetermined depth from the land portion; A second die coupled to the first die; A core including a spacer core interposed between the first die and the second die and extending in a first direction and a body core extending in a second direction perpendicular to the first direction, wherein the core includes an insulating liquid inlet and first and second insulating channels connected to the insulating liquid inlet; and A die coater including a first regulator to control the discharge amount of insulating liquid through the first insulating passage.

2. In paragraph 1, A die coater, characterized in that the first regulator is a bolt.

3. In paragraph 1, A die coater, characterized in that the first regulator is configured to move toward the first insulating path.

4. In paragraph 1, A die coater, characterized in that the first regulator is configured to adjust the cross-sectional area of ​​the first insulating passage.

5. In paragraph 1, A die coater, characterized in that the first regulator is coupled to the second die.

6. In paragraph 1, A die coater characterized in that the second die includes a fastening hole overlapping the first insulating filament.

7. In paragraph 1, A die coater, characterized in that the first regulator is configured to adjust the cross-sectional area of ​​the first insulating passage.

8. In paragraph 1, A die coater comprising a second regulator configured to regulate the second insulating flow.

9. A step of adjusting the cross-sectional area of ​​the first insulating passage of the spacer core interposed between the first and second dies; and A method for manufacturing a secondary battery, comprising the step of providing an electrode slurry and an insulating slurry on an electrode sheet.

10. In paragraph 9, A method for manufacturing a secondary battery, characterized in that the cross-sectional area of ​​the first insulating passage is adjusted so that the discharge amount of insulating slurry through the first insulating passage and the discharge amount of insulating slurry through the second insulating passage of the spacer core are the same.

11. In paragraph 9, The above first die includes a land portion and a manifold, The second die includes a fastening hole overlapping the first insulating filament, and A method for manufacturing a secondary battery, characterized in that the cross-sectional area of ​​the first insulating path is controlled by the operation of a regulator coupled to the second die.

12. In paragraph 11, A method for manufacturing a secondary battery, wherein the controller is configured to move toward the first insulating path.

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