Electrode manufacturing method

Abstract

To provide an electrode manufacturing method that can simplify a configuration of a coating device, and shorten a working time that is required to operate the coating device, and reduce mixing of coating liquid.SOLUTION: A coating device 2 comprises a die head 3A that can coat a base material 100 to be coated being continuously conveyed with a plurality of coating liquid 111 and 112 at the same time. The die head 3A comprises a pair of die blocks 4A and 4B, and a shim plate 5A forming a plurality of passages 53 and 55 through which the plurality of coating liquid 111 and 112 flow and a plurality of discharge ports 54 and 56 between the pair of die blocks 4A and 4B. The plurality of discharge ports 54 and 56 are arranged separately by a predetermined distance L1 with respect to a width direction W of the base material 100 to be coated. The electrode manufacturing method includes a step of coating the base material with the coating liquid at the same time using the die head 3A, in which the base material is coated with the coating liquid so that at least portion of second coating liquid discharged from the second discharge port 56 is arranged above or below the first coating liquid discharged from the first discharge port 54.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a method for producing an electrode. [Background technology]

[0002] Conventionally, a battery electrode in which an active material layer and an insulating layer are formed on the surface of a current collector has been used for lithium ion secondary batteries, etc. Such a battery electrode is manufactured by applying a coating liquid containing an active material, etc. and a coating liquid containing an insulating material, etc., to the surface of a current collector using a coating device so that the two coating liquids partially overlap each other, and then drying the coating liquid.

[0003] For example, Patent Document 1 discloses a manufacturing apparatus including a first die coater that applies a slurry electrode material, and a second die coater that applies a slurry insulating material. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2015-69833 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, the manufacturing apparatus disclosed in Patent Document 1 has a first die coater and a second die coater, which complicates the configuration of the manufacturing apparatus and increases the work time required to operate the manufacturing apparatus (for example, setup work time, maintenance work time, etc.).In addition, the manufacturing apparatus disclosed in Patent Document 1 applies a slurry electrode material, and then applies a slurry insulating material on top of the slurry electrode material, which causes a problem that the electrode material and the insulating material are easily mixed together.

[0006] The present invention has been made in consideration of the above circumstances, and aims to provide a method for manufacturing an electrode that simplifies the configuration of a coating device, shortens the working time required to operate the coating device, and reduces mixing of the coating liquid. [Means for solving the problem]

[0007] The present invention is intended to solve the above-mentioned problems, and a method for producing an electrode according to one embodiment of the present invention includes the steps of: A method for manufacturing an electrode, comprising a step of simultaneously applying a plurality of coating liquids to a continuously conveyed substrate using a die head, The die head is A pair of die blocks arranged opposite to each other along a transport direction of the substrate to be coated; a shim plate that is sandwiched between the pair of die blocks and that forms, between the pair of die blocks, a plurality of flow paths through which the respective coating liquids flow, and a plurality of discharge ports that are in communication with the respective flow paths, The plurality of outlets include a first discharge outlet and a second discharge outlet arranged on one side or both sides of the first discharge outlet in a width direction of the substrate to be coated, The shim plate is a first contact surface and a second contact surface that respectively contact the pair of die blocks; a flow path hole formed to penetrate between the first contact surface and the second contact surface as the first discharge port and the flow path communicating with the first discharge port; a flow channel formed in at least one of the first contact surface and the second contact surface as the second discharge port and the flow channel communicating with the second discharge port; The first outlet and the second outlet are are arranged at a predetermined distance in the width direction, the first coating fluid discharged from the first discharge port contains an active material, is applied to the substrate through the first discharge port, and is dried to form an active material layer; the second coating liquid discharged from the second discharge port contains an insulating material, is applied to the substrate through the second discharge port, and is dried to form an insulating layer; The second coating fluid is applied so that at least a portion of the second coating fluid is disposed above or below the first coating fluid. Effect of the Invention

[0008] According to a method for manufacturing an electrode according to an embodiment of the present invention, a process for simultaneously applying a plurality of coating liquids using a die head having a plurality of outlets for applying each of the plurality of coating liquids is included. Therefore, since a plurality of coating liquids are applied by a single die head, the configuration of the coating device can be simplified and the operation time required for operating the coating device can be shortened.

[0009] In addition, the multiple discharge ports are arranged at a predetermined distance apart. Therefore, gaps are generated between the multiple coating liquids immediately after coating, but the multiple coating liquids spread in the width direction of the substrate over time, so that one coating liquid is disposed above or below the other coating liquid. Therefore, the multiple coating liquids are laminated in layers, and mixing of the multiple coating liquids can be reduced. [Brief description of the drawings]

[0010] [Figure 1] 1 is a schematic configuration diagram showing an entire manufacturing system 1 according to a first embodiment of the present invention. [Diagram 2] 1A and 1B show a die head 3A according to a first embodiment of the present invention, where (a) is an overall perspective view and (b) is an exploded perspective view. [Diagram 3] 1 shows a die head 3A according to a first embodiment of the present invention, where (a) is a front view, (b) is a cross-sectional view taken along line AA, and (c) is a bottom view. [Figure 4] FIG. 2 is an explanatory diagram for explaining the operation of a coating device 2 according to the first embodiment of the present invention, where (a) is a front view and (b) is a top view. [Diagram 5]1 shows a first slurry 111 and a second slurry 112 applied to an electrode sheet 100, where (a) is a cross-sectional view taken along line BB, and (b) is a cross-sectional view taken along line CC. [Figure 6] 5 shows a die head 3B according to a second embodiment of the present invention, where (a) is a front view, (b) is a cross-sectional view taken along line DD, and (c) is a bottom view. [Figure 7] 10A and 10B show a die head 3C according to a third embodiment of the present invention, in which (a) is an overall perspective view and (b) is an exploded perspective view. [Figure 8] 10A and 10B show a die head 3D according to a fourth embodiment of the present invention, where FIG. 10A is an overall perspective view and FIG. [Figure 9] 10A and 10B show a shim plate 5E according to a fifth embodiment of the present invention, where (a) is an overall perspective view and (b) is an exploded perspective view. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

[0012] (First embodiment) FIG. 1 is a schematic diagram showing the overall configuration of a manufacturing system 1 according to a first embodiment of the present invention.

[0013] (Configuration of manufacturing system 1) The battery electrode manufacturing system 1 is a system for manufacturing a battery electrode to be used, for example, as an electrode of a lithium ion secondary battery, by forming an active material layer 121 and an insulating layer 122 on the surface of an electrode sheet 100. In this embodiment, a case where a coating device 2 is applied to the battery electrode manufacturing system 1 will be described.

[0014] The electrode sheet 100 is a substrate to be coated that functions as a sheet-like current collector. The electrode sheet 100 is, for example, a long strip of metal foil having a thickness of about 5 to 20 μm. The electrode sheet 100 is made of a metal material such as aluminum, copper, iron, nickel, stainless steel, or titanium.

[0015] The active material layer 121 is formed by applying a first slurry 111 (first coating liquid) containing an active material to the surface of the electrode sheet 100 and drying it. The thickness of the active material layer 121 is appropriately set in the range of, for example, 30 to 300 μm.

[0016] The first slurry 111 is prepared by mixing, in addition to the active material, for example, a binder and other additives, and dissolving them in a solvent. The viscosity of the first slurry 111 is measured by a Brookfield viscometer at 20° C. and a shear rate of 3.4 s -1 The paste viscosity at 1000° C. is, for example, in the range of 1 to 15 Pa·s. Examples of the active material for the positive electrode include composite oxides of lithium and transition metals, such as lithium-nickel composite oxide, lithium-cobalt composite oxide, lithium-manganese composite oxide, and lithium-manganese-nickel composite oxide. Examples of the active material for the negative electrode include carbon materials, such as natural graphite, artificial graphite, hard carbon, and soft carbon; metals capable of absorbing lithium, such as silicon and tin, and their alloys or oxides; lithium-based metals, such as lithium metal and lithium alloy; and conductive polymers, such as polyacene and polyacetylene.

[0017] The insulating layer 122 is formed by applying a second slurry 112 (second coating liquid) containing an insulating material onto the surface of the electrode sheet 100 and drying it. The thickness of the insulating layer 122 is appropriately set within the range of, for example, 5 to 30 μm.

[0018] The second slurry 112 is prepared by mixing, in addition to the insulating material, for example, a binder and other additives, and dissolving them in a solvent. The viscosity of the second slurry 112 is measured using a Brookfield viscometer at 20° C. and a shear rate of 3.4 s -1 The paste viscosity in this case is, for example, in the range of 0.5 to 3.0 Pa·s, and is, for example, in the range of 0.05 to 50% with respect to the viscosity of the first slurry 111. The insulating material is, for example, an inorganic oxide such as alumina (Al2O3), silica (SiO2), magnesia (MgO), or zirconia (ZrO2).

[0019] The mixing ratio of the materials of the first slurry 111 and the second slurry 112 is appropriately changed depending on the specifications and applications of the battery.

[0020] The manufacturing system 1 includes an unwinding device 10 that unwinds an electrode sheet 100 wound in a roll, a coating device 2 that applies a first slurry 111 and a second slurry 112 to the electrode sheet 100 unwound from the unwinding device 10, a drying furnace 11 that dries and removes the solvent components of the first slurry 111 and the second slurry 112 to form an active material layer 121 and an insulating layer 122 on the surface of the electrode sheet 100, a winding device 12 that winds up the electrode sheet 100 in a roll, a plurality of transport rolls 13 that are arranged between the unwinding device 10 and the winding device 12, and a control device 14 that is composed of a calculation processing circuit such as a CPU and controls the operation of each part of the manufacturing system 1 including the coating device 2.

[0021] In this specification, the direction in which the electrode sheet 100 is continuously transported, i.e., the long dimension direction of the electrode sheet 100, is referred to as the "transport direction R", and the short dimension direction of the electrode sheet 100 is referred to as the "width direction W".

[0022] The electrode sheet 100 is continuously transported in a transport direction R by a plurality of transport rolls 13, with the unwinding device 10 on the upstream side and the winding device 12 on the downstream side.

[0023] The control device 14 applies a predetermined tension to the electrode sheet 100 and controls the rotation speed of the multiple transport rolls 13 so that the transport speed of the electrode sheet 100 is in the range of, for example, 5 to 100 m / min. The arrangement and number of the transport rolls 13 may be changed as appropriate.

[0024] (Configuration of Coating Device 2) The coating device 2 includes a die head 3A capable of simultaneously coating a first slurry 111 and a second slurry 112 onto an electrode sheet 100, a first slurry supply section 21 that supplies the first slurry 111 to the die head 3A, and a second slurry supply section 22 that supplies the second slurry 112 to the die head 3A.

[0025] The tip of the die head 3A is disposed at a predetermined distance G from the electrode sheet 100.

[0026] The first slurry supply section 21 includes a first slurry tank 210 for storing the first slurry 111, a first slurry piping 211 for connecting the first slurry tank 210 and the die head 3A, and a first pump 212 and a first opening / closing valve 213 provided in the first slurry piping 211 for adjusting the supply amount and on / off of the supply when supplying the first slurry 111.

[0027] The second slurry supply section 22 is configured in the same manner as the first slurry supply section 21, and includes a second slurry tank 220 for storing the second slurry 112, a second slurry piping 221 connecting the second slurry tank 220 and the die head 3A, and a second pump 222 and a second opening / closing valve 223 provided in the second slurry piping 221 for adjusting the supply amount and on / off of the supply when supplying the second slurry 112.

[0028] (Die head 3A configuration) Fig. 2 shows a die head 3A according to a first embodiment of the present invention, (a) being an overall perspective view, (b) being an exploded perspective view, and Fig. 3 shows a die head 3A according to a first embodiment of the present invention, (a) being a front view, (b) being a cross-sectional view taken along line AA, and (c) being a bottom view.

[0029] The die head 3A includes a pair of die blocks 4A, 4B disposed opposite each other along the transport direction R of the electrode sheet 100, and a shim plate 5A sandwiched between the pair of die blocks 4A, 4B.

[0030] Each of the pair of die blocks 4A, 4B has a plurality of bolt holes 40 through which bolts (not shown) for clamping and fixing the shim plate 5A are inserted. Of the pair of die blocks 4A, 4B, the first die block 4A is disposed on the upstream side in the conveying direction R, and the second die block 4B is disposed on the downstream side in the conveying direction R.

[0031] One of the pair of die blocks 4A, 4B has a first inlet 41 connected to the first slurry piping 211 through which the first slurry 111 flows in, and a second inlet 42 connected to the second slurry piping 221 through which the second slurry 112 flows in. In this embodiment, the first die block 4A has the first inlet 41, and a recess 43 is formed on the outlet side of the first inlet 41. In addition, the second die block 4B has the second inlet 42.

[0032] The shim plate 5A is composed of a flat plate-shaped member. The shim plate 5A has a first contact surface 50A and a second contact surface 50B that contact the pair of die blocks 4A and 4B, respectively, a coating surface 50C that is arranged with a predetermined gap G from the electrode sheet 100, a flow path hole 51 formed to penetrate between the first contact surface 50A and the second contact surface 50B, a flow path groove 52 formed in at least one of the first contact surface 50A and the second contact surface 50B, and a plurality of bolt holes 57. In this embodiment, the flow path groove 52 is formed in the second contact surface 50B.

[0033] The shim plate 5A is sandwiched between the pair of die blocks 4A and 4B with the first contact surface 50A and the second contact surface 50B in contact with the pair of die blocks 4A and 4B, respectively. At this time, the flow path hole 51 forms, between the pair of die blocks 4A and 4B, a first flow path 53 through which the first slurry 111 flows and a first discharge port 54 communicating with the first flow path 53. In addition, the flow path groove 52 forms, between the pair of die blocks 4A and 4B, a second flow path 55 through which the second slurry 112 flows and a second discharge port 56 communicating with the second flow path 55.

[0034] The first flow passage 53 communicates at both ends with the first inlet 41, the recess 43, and the first outlet port 54, respectively.

[0035] The second flow passage 55 communicates at both ends with the second inlet 42 and the second outlet 56, respectively. The second flow passage 55 is disposed so as to pass inside the bolt holes 57 (toward the center line O1 in the width direction W of the shim plate 5A) without intersecting with the first flow passage 53. The shorter the path length of the second flow passage 55, the lower the discharge pressure of the second pump 222 is set. Note that the bolt hole 40 may be used as the second inlet 42.

[0036] The second flow path 55 is formed to form a predetermined angle θ (e.g., 90°) with respect to the coating surface 50C. As the angle θ increases, the first slurry 111 and the second slurry 112 immediately after being applied to the electrode sheet 100 from the first discharge port 54 and the second discharge port 56 are more likely to be prevented from mixing.

[0037] The first discharge port 54 is disposed at a position including a center line O1 of the width direction W of the shim plate 5A. The second discharge port 56 is disposed on one side of the first discharge port 54 in the width direction W. The first discharge port 54 and the second discharge port 56 are disposed at a predetermined distance (hereinafter referred to as "separation distance") L1 in the width direction W.

[0038] The separation distance L1 is set so that when the first slurry 111 applied to the electrode sheet 100 from the first discharge port 54 spreads in the width direction W and the second slurry 112 applied to the electrode sheet 100 from the second discharge port 56 spreads in the width direction W, the second slurry 112 is disposed to overlap the upper or lower part of the first slurry 111. Specifically, the separation distance L1 is, for example, 0.5 to 2.0 mm. In this embodiment, the separation distance L1 is set so that when the first slurry 111 and the second slurry 112 each spread in the width direction W, at least a part of the second slurry 112 in the width direction W is disposed to overlap the lower part of the first slurry 111.

[0039] The opening area of ​​the first outlet 54 is set to be larger than the opening area of ​​the second outlet 56 .

[0040] The width W1 of the first outlet 54 in the width direction W is set to be wider than the width W2 of the second outlet 56 in the width direction W. The width W1 is, for example, 550 mm to 560 mm, while the width W2 is, for example, 3 mm to 4 mm. The width W2 of the second outlet 56 is, for example, in the range of 0.35 to 0.80% of the width W1 of the first outlet 54. Moreover, the width W2 of the second outlet 56 is, for example, in the range of 150 to 800% of the separation distance L1.

[0041] A height T1 of the first discharge port 54 in the thickness direction T of the shim plate 5A is set to be higher than a height T2 of the second discharge port 56 in the thickness direction T. The height T1 is, for example, 1.0 mm to 1.5 mm, while the height T2 is, for example, 0.3 mm to 1.0 mm. The height T2 of the second discharge port 56 is, for example, in the range of 10 to 100% of the height T1 of the first discharge port 54.

[0042] In this embodiment, the height T1 is equal to the depth of the flow passage hole 51, i.e., the thickness of the shim plate 5A, and the height T2 is equal to the depth of the flow passage groove 52. The shapes and sizes of the flow passage hole 51 and the flow passage groove 52 are not limited to those shown in Fig. 2 and Fig. 3 and may be changed as appropriate. The cross-sectional shape of the flow passage groove 52 is not limited to a quadrangle and may be, for example, a triangular shape or a semicircular shape.

[0043] (Operation of manufacturing system 1) Next, the operation of the manufacturing system 1 having the above configuration will be described with reference to FIGS.

[0044] Fig. 4 is an explanatory diagram for explaining the operation of the coating device 2 according to the first embodiment of the present invention, (a) being a front view and (b) being a top view. Fig. 5 shows the first slurry 111 and the second slurry 112 coated on the electrode sheet 100, (a) being a cross-sectional view taken along line BB and (b) being a cross-sectional view taken along line CC. Note that in Figs. 4 and 5, the electrode sheet 100 is depicted as being linear, not curved.

[0045] First, when a roll-shaped electrode sheet 100 is prepared in an unwinding device 10, the control device 14 controls a plurality of transport rolls 13 so that the electrode sheet 100 is continuously transported along the transport direction R.

[0046] At this time, the control device 14 controls the first pump 212 and the first opening / closing valve 213 to supply the first slurry 111 to the die head 3A. In addition, the control device 14 controls the second pump 222 and the second opening / closing valve 223 to supply the second slurry 112 to the die head 3A.

[0047] The first slurry 111 flows through the first inlet 41 and the first flow path 53, and is discharged from the first discharge port 54. The second slurry 112 flows through the second inlet 42 and the second flow path 55, and is discharged from the second discharge port 56.

[0048] In this manner, the first slurry 111 is applied to the electrode sheet 100 through the first discharge outlet 54, and the second slurry 112 is applied to the electrode sheet 100 through the second discharge outlet 56, thereby performing a coating process.

[0049] Immediately after the first slurry 111 and the second slurry 112 are applied, as shown in Fig. 5(a), a gap S is generated between the first and second slurry 111 and 112 in the width direction W. The gap S is generated because the first discharge port 54 and the second discharge port 56 are disposed at a distance L1 from each other.

[0050] Since the first slurry 111 and the second slurry 112 are in a paste form, with the passage of time from when the first slurry 111 and the second slurry 112 are applied to the electrode sheet 100 until the applied portion of the electrode sheet 100 reaches the drying furnace 11, the first slurry 111 gradually spreads in the width direction W, and the second slurry 112 gradually spreads in the width direction W.

[0051] 5(b), the arrangement step is performed by filling the gap S with the first slurry 111 and the second slurry 112, and arranging the second slurry 112 so that a part of the second slurry 112 in the width direction W overlaps with the lower part of the first slurry 111. That is, when the first slurry 111 and the second slurry 112 each spread in the width direction W, a part of the second slurry 112 including one end 112a located on the first slurry 111 side is arranged in a state of overlapping with the second slurry 112, and a part of the second slurry 112 including the other end 112b not located on the first slurry 111 side is arranged without overlapping with the second slurry 112.

[0052] Here, assuming that the width of the overlapped portion where the first slurry 111 and the second slurry 112 overlap is the overlap width W3, the overlap width W3 is set to, for example, 1 mm or less. The overlap width W3 is adjusted by parameters such as the size of the first discharge port 54 (width W1, height T1), the size of the second discharge port 56 (width W2, height T2), the separation distance L1 between the first discharge port 54 and the second discharge port 56, the viscosity of the first slurry 111 and the second slurry 112, the gap G between the electrode sheet 100 and the coating surface 10C, the conveying speed of the electrode sheet 100, the rotation speed of the first pump 212 and the second pump 222, and the opening degree of the first opening / closing valve 213 and the second opening / closing valve 223.

[0053] Next, a drying step is performed by passing the electrode sheet 100 through a drying furnace 11 while the first slurry 111 and the second slurry 112 are arranged as shown in Fig. 5(b) . As a result, the surface of the electrode sheet 100 is provided with a portion where only the active material layer 121 is formed, a lap portion where the active material layer 121 and the insulating layer 122 are overlapped, and a portion where only the insulating layer 122 is formed, in the width direction W of the electrode sheet 100.

[0054] Then, the electrode sheet 100 on which the active material layer 121 and the insulating layer 122 are formed is sequentially wound up by a winding device 12. The manufacturing system 1 manufactures a battery electrode by continuously performing each process.

[0055] As described above, according to the coating device 2 according to the first embodiment, the die head 3A includes the first discharge port 54 and the second discharge port 56 for respectively applying the first slurry 111 and the second slurry 112. Therefore, since a plurality of coating fluids are applied by the single die head 3A, the configuration of the coating device 2 can be simplified and the working time required to operate the coating device 2 can be shortened.

[0056] Moreover, the first discharge port 54 and the second discharge port 56 are disposed at a distance L1 from each other. Therefore, a gap S is generated between the first slurry 111 and the second slurry 112 immediately after application, but the first slurry 111 and the second slurry 112 each spread in the width direction W with the passage of time, so that a part of the second slurry 112 in the width direction W overlaps with the lower part of the first slurry 111. Therefore, the first slurry 111 and the second slurry 112 are laminated in layers, so that mixing of the first slurry 111 and the second slurry 112 can be reduced.

[0057] Second embodiment FIG. 6 shows a die head 3B according to a second embodiment of the present invention, where (a) is a front view, (b) is a cross-sectional view taken along line DD, and (c) is a bottom view.

[0058] In the coating device 2 according to the first embodiment, the second discharge port 56 is disposed on one side in the width direction W with respect to the first discharge port 54. In contrast, in the coating device 2 according to the second embodiment, the configuration of the die head 3B is changed so that the second discharge ports 56A, 56B are disposed on both sides in the width direction W with respect to the first discharge port 54. Since the basic configuration is the same as in the first embodiment, a description will be omitted, focusing mainly on the different configurations.

[0059] The die block 4A has two second inlet holes 42A, 42B. As a configuration for supplying the second slurry 112 to each of the two second inlet holes 42A, 42B, for example, the second slurry pipe 221 may be branched midway, or the coating device 2 may be provided with two second slurry supply units 22.

[0060] The shim plate 5B has two flow passage grooves 52A, 52B formed in the second contact surface 50B. Each of the two flow passage grooves 52A, 52B forms, between the pair of die blocks 4A, 4B, second flow passages 55A, 55B through which the second slurry 112 flows, and second discharge ports 56A, 56B communicating with the second flow passages 55A, 55B.

[0061] The two second outlets 56A, 56 are disposed on both sides of the first outlet 54 in the width direction W. The first outlet 54 and each of the two second outlets 56A are disposed to be spaced apart from each other in the width direction W by a separation distance L1.

[0062] As described above, according to the coating device 2 of the second embodiment, the second discharge ports 56A, 56B are disposed on both sides in the width direction W of the first discharge port 54. Therefore, the insulating layers 122 can be formed on both sides in the width direction W of the active material layer 121 by using one die head 3B.

[0063] (Third embodiment) FIG. 7 shows a die head 3C according to a third embodiment of the present invention, where (a) is an overall perspective view and (b) is an exploded perspective view.

[0064] In the coating device 2 according to the first embodiment, the shim plate 5A has a flow passage hole 51 and a flow passage groove 52. In contrast, in the coating device 2 according to the third embodiment, the configuration of the die head 3C is modified so that the shim plate 5C has a first flow passage groove 52A that replaces the flow passage hole 51 and a second flow passage groove 52B similar to the flow passage groove 52. Since the basic configuration is the same as in the first embodiment, a description will be omitted, focusing on the different configuration parts.

[0065] The first flow path groove 52A and the second flow path groove 52B are formed in the second contact surface 50B. At least one of the first flow path groove 52A and the second flow path groove 52B may be formed in the first contact surface 50A.

[0066] The first flow channel 52A forms a first flow channel 53 through which the first slurry 111 flows, and a first discharge port 54 communicating with the first flow channel 53. The second flow channel 52B forms a second flow channel 55 through which the second slurry 112 flows, and a second discharge port 56 communicating with the second flow channel 55.

[0067] As described above, according to the coating device 2 of the third embodiment, the shim plate 5C has multiple flow path grooves 52A, 52B which form flow paths 53, 55 and discharge ports 54, 56 for coating the first slurry 111 and the second slurry 112, respectively, so that the shim plate 5C can be easily manufactured.

[0068] (Fourth embodiment) FIG. 8 shows a die head 3D according to a fourth embodiment of the present invention, where (a) is an overall perspective view and (b) is an exploded perspective view.

[0069] In the coating device 2 according to the first embodiment, the shim plate 5A has a flow path hole 51 and a flow path groove 52. In contrast, in the coating device 2 according to the fourth embodiment, the configuration of the die head 3D is changed so that a shim plate 5D has a first flow path hole 51A similar to the flow path hole 51 and a second flow path hole 51B that replaces the flow path groove 52. Since the basic configuration is the same as in the first embodiment, a description will be omitted, focusing on the different configuration parts.

[0070] The first flow path hole 51A forms a first flow path 53 through which the first slurry 111 flows and a first discharge port 54 communicating with the first flow path 53. The second flow path hole 51B forms a second flow path 55 through which the second slurry 112 flows and a second discharge port 56 communicating with the second flow path 55.

[0071] As described above, according to the coating device 2 of the fourth embodiment, the shim plate 5D has a plurality of flow path holes 51A, 51B which form the flow paths 53, 55 and the discharge ports 54, 56 for coating the first slurry 111 and the second slurry 112, respectively, so that the shim plate 5D can be easily manufactured.

[0072] Fifth embodiment FIG. 9 shows a shim plate 5E according to a fifth embodiment of the present invention, where (a) is an overall perspective view and (b) is an exploded perspective view.

[0073] In the coating device 2 according to the first embodiment, the shim plate 5A is formed of a flat plate-shaped member. In contrast, in the fifth embodiment, the method of manufacturing the shim plate 5E is changed so that the shim plate 5E is formed by stacking a plurality of shims 6A and 6B. Since the basic configuration is the same as in the first embodiment, a description will be omitted, focusing on the different configurations.

[0074] The first shim 6A is disposed on the side of the first die block 4A. The first shim 6A has a first opening 61 formed in a T-shape at a position including the center line O1.

[0075] The second shim 6B is disposed on the second die block 4B side. The second shim 6B has a second opening 62 formed in the same position as the first opening 61 and with the same shape and size as the first opening 61, and a third opening 63 formed in an elongated shape on one side in the width direction W with respect to the second opening 60B.

[0076] In the shim plate 5E, a first shim 6A and a second shim 6B are stacked in the thickness direction T, so that the first opening 61 and the second opening 62 function as the flow path hole 51, and the third opening 63 functions as the flow path groove 52. The number of stacked shims 6A and 6B is not limited to two, and may be three or more. The thicknesses of the shims 6A and 6B may be different from each other.

[0077] As described above, according to the coating device 2 according to the fifth embodiment, the shim plate 5E is formed by stacking a plurality of shims 6A and 6B. Therefore, even if the flow path holes 51 and the flow path grooves 52 have complex shapes, the shim plate 5E can be easily manufactured.

[0078] (Other embodiments) Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and can be modified as appropriate without departing from the technical concept of the present invention.

[0079] For example, the first to fifth embodiments may be appropriately combined, and the shim plates 5B to 5D according to the second to fourth embodiments may be manufactured by stacking a plurality of shims, as in the case of the shim plate 5E according to the fifth embodiment. In that case, the number of stacked shims, the thickness of each shim, and the shape and size of the opening may be appropriately changed.

[0080] Moreover, the shim plates 5A to 5E according to the first to fifth embodiments may be configured to be replaceable with respect to the coating device 2. In this case, one coating device 2 may use a plurality of shim plates 5A to 5E by replacing them, or a plurality of coating devices 2 may share one shim plate 5A.

[0081] In the first to fifth embodiments, the coating device 2 has been described as having two or three outlets as the multiple outlets, but may have four or more outlets. The coating fluids applied from the multiple outlets may be the same type or different types.

[0082] In the above embodiment, the second slurry 112 is arranged so that a part of the second slurry 112 in the width direction W overlaps with a lower part of the first slurry 111 in the arranging step. However, the second slurry 112 may be arranged so that a part of the second slurry 112 in the width direction W overlaps with an upper part of the first slurry 111 in the arranging step. In this case, the size of the first discharge outlet 54 and the second discharge outlet 56, the separation distance L1 between the first discharge outlet 54 and the second discharge outlet 56, the viscosity of the first slurry 111 and the second slurry 112, the distance G between the electrode sheet 100 and the coating surface 10C, the conveying speed of the electrode sheet 100, the rotation speed of the first pump 212 and the second pump 222, and the opening degree of the first opening / closing valve 213 and the second opening / closing valve 223, etc., can be changed to adjust the coating amount when the first slurry 111 and the second slurry 112 are applied to the electrode sheet 100 and the speed at which the first slurry 111 and the second slurry 112 spread in the width direction W.

[0083] In the above embodiment, the electrode sheet 100 is described as being wound up by the winding device 12 after the drying step. However, another step may be added after the drying step, and for example, a rolling step of rolling the electrode sheet 100 on which the active material layer 121 and the insulating layer 122 have been formed, or a cutting step of cutting the electrode sheet 100 to a predetermined size may be added. [Explanation of symbols]

[0084] 1... Manufacturing system, 2... Coating device, 3A~3D…Die head, 4A,4B…Die block, 5A~5D…shim plate, 6…shim, 10...unwinding device, 11...drying furnace, 12...winding device, 13...conveyor roll, 14...control device, 21: first slurry supply unit; 22: second slurry supply unit; 40...bolt hole, 41...first inlet hole, 42, 42A, 42B... second inlet holes, 43... recessed portion, 50A: first contact surface; 50B: second contact surface; 50C: coated surface; 51, 51A, 51B...flow path hole, 52, 52A, 52B...flow path groove, 53: first flow path; 54: first discharge port; 55, 55A, 55B...second flow path, 56, 56A, 56B...second outlet, 61: first opening; 62: second opening; 63: third opening; 100: electrode sheet; 111: first slurry; 112: second slurry; 112a...one end, 112b...other end, 121...active material layer, 122...insulating layer, 210: first slurry tank; 211: first slurry piping; 212: first pump; 213: first opening / closing valve; 220: second slurry tank; 221: second slurry piping; 222: second pump; 223: second opening / closing valve; R: conveying direction, T: thickness direction, W: width direction

Claims

1. A method for manufacturing an electrode, comprising a step of simultaneously applying a plurality of coating liquids to a continuously conveyed substrate using a die head, The die head is A pair of die blocks arranged opposite to each other along a transport direction of the substrate to be coated; a shim plate that is sandwiched between the pair of die blocks and that forms, between the pair of die blocks, a plurality of flow paths through which the respective coating liquids flow, and a plurality of discharge ports that are in communication with the respective flow paths, The plurality of outlets include a first discharge outlet; and a second discharge outlet arranged on one side or both sides of the first discharge outlet in a width direction of the substrate to be coated, The shim plate is a first contact surface and a second contact surface that respectively contact the pair of die blocks; a flow path hole formed to penetrate between the first contact surface and the second contact surface as the first discharge port and the flow path communicating with the first discharge port; a flow channel formed in at least one of the first contact surface and the second contact surface as the second discharge port and the flow channel communicating with the second discharge port; The first outlet and the second outlet are are arranged at a predetermined distance in the width direction, The opening area of ​​the first outlet is larger than the opening area of ​​the second outlet, a height of the first outlet port in a thickness direction of the shim plate is greater than a height of the second outlet port in the thickness direction; the first coating fluid discharged from the first discharge port contains an active material, is applied to the substrate via the first discharge port, and is dried to form an active material layer; the second coating liquid discharged from the second discharge port contains an insulating material, is applied to the substrate through the second discharge port, and is dried to form an insulating layer; The second coating liquid is applied so that at least a part of the second coating liquid in the width direction is disposed below the first coating liquid. A method for manufacturing an electrode.

2. one end of the second coating fluid in the width direction is disposed below the first coating fluid, The second coating liquid is applied so that the other end portion in the width direction is arranged without overlapping with the first coating liquid. A method for producing the electrode according to claim 1 .

3. The viscosity of the second coating liquid is 0.05 to 50% of the viscosity of the first coating liquid. A method for producing the electrode according to claim 1 or 2.

4. a width of the first outlet in the width direction is wider than a width of the second outlet in the width direction; A method for producing the electrode according to any one of claims 1 to 3.

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