Foreign object removal device

Abstract

To provide a foreign matter removal device that can easily remove foreign matter from electrode composite material without relying on the magnetism of the foreign matter. [Solution] The foreign matter removal device 100 has a conveyor belt 11 on which electrode mixture W1 is placed and which moves in one direction, and a mesh belt 51 which has a mesh opening that allows the electrode mixture W1 to pass through while preventing foreign matter W2 of a predetermined size or larger that has been mixed into the electrode mixture W1 from passing through. The mesh belt 51 moves relative to the conveyor belt 11, thereby applying a shearing force to the electrode mixture W1 sandwiched between the conveyor belt 11 and the mesh, causing the electrode mixture W1 to pass through the mesh.

Description

Technical Field

[0001] The present disclosure relates to a foreign matter removal device, and particularly to a foreign matter removal device for removing foreign matter from an electrode composite material.

Background Art

[0002] When manufacturing an electrode, foreign matter such as metal powder may be mixed into the electrode composite material containing the electrode active material. An electrode manufactured using the electrode composite material containing foreign matter will contain the foreign matter. As a technique for removing such foreign matter, for example, Patent Documents 1 and 2 can be cited.

[0003] Patent Document 1 discloses a method for manufacturing a single-sheet electrode including a metal foil and an active material layer on at least one surface of the metal foil. The method for manufacturing the electrode includes a cutting step of cutting the metal foil having the active material layer into an electrode, and an adsorption step that is performed after the cutting step and adsorbs foreign matter to a magnet by applying a magnetic field using the magnet to at least one of the first surface and the second surface of the electrode. Thereby, the foreign matter in the electrode is reduced.

[0004] Patent Document 2 discloses a foreign matter removal method for removing foreign matter from an electrode composite material sheet formed by making the electrode composite material into a sheet shape. The foreign matter removal method removes a foreign matter-containing composite material portion from the electrode composite material sheet such that the foreign matter-containing composite material portion, which is a portion extending throughout the thickness direction of the electrode composite material sheet and contains foreign matter, becomes a perforation portion penetrating in the thickness direction of the electrode composite material sheet. Thereby, the foreign matter contained in the electrode composite material sheet is removed.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Summary of the Invention

[0006] However, the technologies described in Patent Documents 1 and 2 utilize the magnetism of the foreign object, which is a magnetic material, to remove it. Therefore, if the foreign object to be removed is a non-magnetic material, the effect of removing the foreign object may not be obtained.

[0007] This disclosure was made to solve such problems and aims to provide a foreign matter removal device that can easily remove foreign matter from electrode composite material without relying on the magnetism of the foreign matter. [Means for solving the problem]

[0008] The foreign matter removal device according to this disclosure comprises a conveyor belt on which electrode material is placed and which moves in one direction, and a mesh belt having a mesh opening that allows the electrode material to pass through while preventing foreign matter of a predetermined size or larger that has been mixed into the electrode material from passing through. The mesh belt moves relative to the conveyor belt, thereby applying a shear force to the electrode material sandwiched between the conveyor belt and the mesh, causing the electrode material to pass through the mesh. [Effects of the Invention]

[0009] This disclosure provides a foreign matter removal device that can easily remove foreign matter from electrode composite material without relying on the magnetism of the foreign matter. [Brief explanation of the drawing]

[0010] [Figure 1] This diagram schematically shows the configuration of the foreign matter removal device according to Embodiment 1. [Figure 2] This diagram schematically shows the configuration of the foreign matter removal device according to Embodiment 2. [Figure 3] This is a photographic diagram showing the appearance of the electrode active material powder before and after foreign matter removal in the example. [Modes for carrying out the invention]

[0011] Embodiments of the present disclosure will be described below with reference to the drawings. However, the present disclosure is not limited to the embodiments described below. The figures show only a part of the whole, and there are actually many other components not shown. Also, the following description and drawings have been simplified as appropriate for clarity. In the following description, the same or equivalent elements are denoted by the same reference numerals, and redundant descriptions are omitted.

[0012] Embodiment 1 Figure 1 is a schematic diagram showing the configuration of a foreign matter removal device according to Embodiment 1. The foreign matter removal device 100 shown in Figure 1 is a device that continuously removes foreign matter W2 from electrode mixture W1 while continuously conveying the electrode mixture W1 downstream along a conveying path. As shown in Figure 1, the foreign matter removal device 100 has a conveying unit 10, a supply unit 20, a flattening unit 30, a pressing unit 40, a foreign matter removal unit 50, a peeling unit 60, a recovery unit 70, a cleaning unit 80, and a control unit 90.

[0013] The conveying unit 10 includes guide rollers R1, R2, R3, R4, a drive source such as a motor attached to at least one of the guide rollers R1, R2, R3, R4, and a conveying belt 11. The guide rollers R1, R2, R3, R4 rotatably support the conveying belt 11. The drive source rotates at least one of the guide rollers R1, R2, R3, R4. The drive source is electrically connected to the control unit 90, and the drive is controlled by the control unit 90. In this embodiment, the rotation direction of the guide rollers R1, R2, R3, R4 is the direction in which the conveying belt 11 moves counterclockwise in Figure 1.

[0014] The conveyor belt 11 is an endless belt member wrapped around guide rollers R1, R2, R3, and R4. The conveyor belt 11 is subjected to the required tension. The conveyor belt 11 moves in one direction at a predetermined speed as the guide rollers R1, R2, R3, and R4 rotate. The white arrow in Figure 1 indicates the direction of movement D1 of the conveyor belt 11. The electrode mixture W1 is placed on the surface of the conveyor belt 11. The conveying path of the electrode mixture W1 is set to move along the conveyor belt 11 from guide roller R1 to guide roller R2.

[0015] The electrode mixture W1 supplied onto the conveyor belt 11 is in powder form. The electrode mixture W1 may contain, for example, an electrode active material, a conductive material, and a binder. The electrode mixture W1 supplied onto the conveyor belt 11 contains foreign matter W2, such as metal powder. The foreign matter W2 may be a magnetic material such as iron or magnetic stainless steel, or a non-magnetic material such as copper, aluminum, or non-magnetic stainless steel. If a battery is manufactured using electrode mixture W1 containing such foreign matter W2, the foreign matter W2 may cause a minute short circuit, leading to a decrease in battery voltage. Therefore, it is desirable to remove the foreign matter W2 before manufacturing the battery. The particle size of the foreign matter W2 that may cause a minute short circuit is determined in relation to the required battery performance, and for example, the particle size of the foreign matter W2 is 30 to 80 μm. The particle size may be the average particle size measured using the laser light scattering method.

[0016] The supply unit 20 is located upstream of the transport path. The supply unit 20 has, for example, a hopper 21 located above the transport belt 11 between the guide roller R1 and the flattening processing unit 30. The supply unit 20 supplies the electrode mixture W1 from the hopper 21 onto the transport belt 11. The supply unit 20 can stably supply the electrode mixture W1 onto the transport belt 11 by temporarily storing the electrode mixture W1 in the hopper 21 before supplying it onto the transport belt 11. The electrode mixture W1 supplied onto the transport belt 11 by the supply unit 20 is transported to the flattening processing unit 30 by the moving transport belt 11.

[0017] The flattening processing unit 30 is disposed on the downstream side of the supply unit 20 in the conveyance path and on the upstream side of the press unit 40 in the conveyance path. The flattening processing unit 30 has, for example, a squeegee 31 disposed above the conveyance belt 11 between the supply unit 20 and the press unit 40 with a predetermined distance from the conveyance belt 11. The flattening processing unit 30 flattens the electrode mixture W1 supplied onto the conveyance belt 11 from the hopper 21 by the squeegee 31. That is, the flattening processing unit 30 flattens the electrode mixture W1 before passing through the mesh of the mesh belt 51 described later. By flattening the electrode mixture W1 on the conveyance belt 11, the flattening processing unit 30 suppresses variations in the basis weight of the electrode mixture W1 supplied to the downstream of the conveyance path from the flattening processing unit 30. The electrode mixture W1 flattened by the flattening processing unit 30 is conveyed to the press unit 40 by the moving conveyance belt 11.

[0018] The press unit 40 is disposed on the downstream side of the flattening processing unit 30 in the conveyance path and on the upstream side of the foreign matter removal unit 50 in the conveyance path. The press unit 40 has, for example, a pair of press rollers 41 and a drive source such as a motor attached to at least one of the pair of press rollers 41. The pair of press rollers 41 are arranged to face each other along a direction perpendicular to the front and back surfaces of the conveyance belt 11 so as to sandwich the conveyance belt 11 between the squeegee 31 and the guide roller R2. The drive source rotationally drives at least one of the pair of press rollers 41. The drive source is electrically connected to the control unit 90, and the drive is controlled by the control unit 90.

[0019] The press unit 40 presses the electrode mixture W1 on the conveyance belt 11 by the pair of press rollers 41. That is, the press unit 40 presses the electrode mixture W1 before passing through the mesh of the mesh belt 51 described later. By pressing the electrode mixture W1, the press unit 40 suppresses the occurrence of dropout of the electrode mixture W1 supplied to the downstream of the conveyance path from the press unit 40. The electrode mixture W1 pressed by the press unit 40 is formed in a layer and conveyed to the foreign matter removal unit 50 by the moving conveyance belt 11.

[0020] The foreign object removal unit 50 is disposed on the downstream side of the conveyance path from the press unit 40 and on the upstream side of the peeling unit 60 in the conveyance path. The foreign object removal unit 50 has, for example, guide rollers R5, R6, R7, R8, a drive source such as a motor attached to at least one of the guide rollers R5, R6, R7, R8, and a mesh belt 51. The guide rollers R5, R6, R7, R8 rotatably support the mesh belt 51. The drive source rotationally drives at least one of the guide rollers R5, R6, R7, R8. The drive source is electrically connected to the control unit 90 and its driving is controlled by the control unit 90. In the present embodiment, the rotational direction of the guide rollers R5, R6, R7, R8 is the direction in which the mesh belt 51 is moved counterclockwise in FIG. 1.

[0021] The mesh belt 51 is an endless belt member wound around the guide rollers R5, R6, R7, R8. A required tension is applied to the mesh belt 51. The mesh belt 51 moves in one direction at a predetermined moving speed as the guide rollers R5, R6, R7, R8 rotate. The black arrow in FIG. 1 indicates the moving direction D2 of the mesh belt 51. The portion of the mesh belt 51 facing the conveyance belt 11 moves at a moving speed substantially the same as that of the conveyance belt 11 in a direction opposite to the moving direction D1 of the portion of the conveyance belt 11 facing the mesh belt 51.

[0022] The mesh belt 51 has a mesh with an aperture that blocks the passage of foreign objects W2 having a size greater than a predetermined size mixed in the electrode laminate W1 while allowing the electrode laminate W1 to pass therethrough. By moving relative to the conveyance belt 11, this mesh belt 51 applies a shearing force (shearing stress) to the electrode laminate W1 sandwiched between it and the conveyance belt 11 to cause the electrode laminate W1 to pass through the mesh. In the present embodiment, the mesh belt 51 moves at a moving speed substantially the same as that of the conveyance belt 11 in the moving direction D2, thereby generating a shearing force between itself and the conveyance belt 11. From the viewpoint of enhancing the removal efficiency of the foreign objects W2, it is preferable that the width of the mesh belt 51 is not less than the width of the conveyance belt 11.

[0023] The mesh opening of the mesh belt 51 is preferably less than the lower limit of the particle size of the foreign matter W2. This ensures that the foreign matter W2 is reliably removed from the electrode mixture W1. Alternatively, the mesh opening of the mesh belt 51 is preferably greater than the upper limit of the particle size of the electrode mixture W1. This prevents the electrode mixture W1 from clogging the mesh of the mesh belt 51. The mesh of the mesh belt 51 may be formed, for example, by providing through holes in a flat surface, or by weaving it into a mesh pattern.

[0024] During the transport of the electrode mixture W1, a portion of the mesh belt 51 faces a portion of the transport belt 11 via the electrode mixture W1. In this embodiment, the mesh belt 51 is wrapped around the guide roller R2 together with the transport belt 11. Therefore, the portion of the mesh belt 51 wrapped around the guide roller R2 faces the portion of the transport belt 11 wrapped around the guide roller R2.

[0025] The electrode mixture W1 is sandwiched between the portion of the mesh belt 51 facing the conveyor belt 11 and the portion of the conveyor belt 11 facing the mesh belt 51. The electrode mixture W1 is conveyed while sandwiched between the conveyor belt 11 and the mesh belt 51 as it passes through the guide roller R2. In this embodiment, when the electrode mixture W1 is conveyed, the portion of the mesh belt 51 facing the conveyor belt 11 moves in the opposite direction to the portion of the conveyor belt 11 facing the mesh belt 51 at approximately the same speed as the conveyor belt 11. Therefore, a shear force is generated between the conveyor belt 11 and the mesh belt 51 at the portion where they face each other. The shear force generated between the conveyor belt 11 and the mesh belt 51 is applied to the electrode mixture W1 sandwiched between the conveyor belt 11 and the mesh belt 51.

[0026] Then, the electrode mixture W1, which is smaller than the mesh opening of the mesh belt 51, passes through the mesh from the surface of the mesh belt 51 to the back surface of the mesh belt 51 due to the shear force applied. In this way, the shear force generated between the conveyor belt 11 and the mesh belt 51 facilitates the passage of the electrode mixture W1, which is smaller than the mesh opening of the mesh belt 51, through the mesh. On the other hand, foreign matter W2, which is larger than the mesh opening of the mesh belt 51, does not pass through the mesh of the mesh belt 51 even when a shear force is applied, and is captured on the surface of the mesh belt 51.

[0027] The materials of the conveyor belt 11 and the mesh belt 51 can be appropriately selected according to the properties of the electrode mixture W1. When the electrode mixture W1 is in powder form, the materials of the conveyor belt 11 and the mesh belt 51 can be metals such as stainless steel, resins such as polytetrafluoroethylene (PTFE) and perfluoroalkoxyalkane (PFA), or nonwoven fabrics. When the electrode mixture W1 is in powder form, stainless steel is preferably used as the material for the conveyor belt 11 and the mesh belt 51 because of its excellent durability, rigidity, and abrasion resistance. The conveyor belt 11 and the mesh belt 51 may be made of the same material or different materials.

[0028] In the foreign matter removal section 50, foreign matter W2 captured by the mesh belt 51 is transported to the cleaning section 80 by the moving mesh belt 51. The transport path for foreign matter W2 is set to pass through guide rollers R2, R8, R7, and R6 in that order on the mesh belt 51 and proceed to the cleaning section 80.

[0029] The peeling section 60 is positioned between the foreign matter removal section 50 and the recovery section 70. The peeling section 60 has, for example, a scraper 61 whose tip contacts the back surface of the mesh belt 51 after it has passed through the guide roller R2. The peeling section 60 uses the scraper 61 to peel off the electrode mixture W1 that has passed through the mesh of the mesh belt 51 and adhered to the back surface of the mesh belt 51.

[0030] The recovery unit 70 is located below the guide roller R2 and the peeling unit 60. The recovery unit 70 has, for example, a box-shaped container 71 with an open top. The recovery unit 70 recovers the electrode mixture W1 that has passed through the mesh of the mesh belt 51 into the container 71. The electrode mixture W1 recovered by the recovery unit 70 includes the electrode mixture W1 that has passed through the mesh of the mesh belt 51 and fallen as is, and the electrode mixture W1 that has been peeled off from the mesh belt 51 by the peeling unit 60 and fallen. Since the electrode mixture W1 recovered by the recovery unit 70 does not contain foreign matter W2, the recovered electrode mixture W1 can be used as a good product in the manufacture of electrodes.

[0031] The cleaning unit 80 is positioned above the mesh belt 51 between the guide rollers R5 and R6. The cleaning unit 80 has an air blower 81 that blows compressed air supplied from an air supply source out of an outlet extending in the direction of movement D2 of the mesh belt 51. The air blower 81 is electrically connected to the control unit 90 and its drive is controlled by the control unit 90.

[0032] The cleaning unit 80 uses an air blower 81 to detach foreign matter W2 that has been trapped on the surface of the mesh belt 51 without passing through the mesh. The cleaning unit 80 blows air towards the back surface of the mesh belt 51 as it moves below the air blower 81, and the air pressure of the blown air blows the foreign matter W2 trapped on the surface of the mesh belt 51 downwards. In this way, the cleaning unit 80 cleans the mesh belt 51. The air pressure of the air blown from the air blower 81 is set appropriately according to the size and weight of the foreign matter W2.

[0033] The cleaning unit 80 can remove foreign matter W2 from the moving mesh belt 51 and clean the mesh belt 51, thus eliminating the need for equipment downtime associated with filter replacement, which may occur when removing foreign matter W2 from the electrode mixture W1 by passing it through an in-line filter. However, when removing foreign matter W2 from the electrode mixture W1 by passing it through an in-line filter, there is a risk that the equipment will become larger due to the provision of a bypass route for processing the foreign matter W2. On the other hand, since the cleaning unit 80 can clean the mesh belt 51 while it is circulating, it enables continuous use of the mesh belt 51. Therefore, the mesh belt 51 does not need to be replaced, and there is no need to provide multiple processing lines, thus suppressing the increase in size of the foreign matter removal device 100.

[0034] Furthermore, when cleaning the mesh belt 51 with the cleaning unit 80, vibrations are applied to the mesh belt 51 as it passes below the air blow 81 using a vibrator or the like, making it easy to detach foreign matter W2 captured by the mesh belt 51 from the mesh belt 51.

[0035] The control unit 90 includes, for example, a CPU (Central Processing Unit), RAM (Random-Access Memory), and ROM (Read-Only Memory). The CPU controls the entire foreign matter removal device 100, including the operation of the aforementioned drive sources and the air blower 81, by executing a control program stored in the ROM. The RAM is used as a work area when the CPU is executing its control.

[0036] As described above, the foreign matter removal device 100 according to Embodiment 1 removes the foreign matter W2 by utilizing the size of the foreign matter W2. Therefore, according to the foreign matter removal device 100 according to Embodiment 1, it is possible to easily remove the foreign matter W2 from the electrode mixture W1 without relying on the magnetism of the foreign matter W2.

[0037] Embodiment 2 Embodiment 2 describes a foreign matter removal device 200, which is another form of the foreign matter removal device 100. In the description of Embodiment 2, components that are the same as those described in Embodiment 1 are denoted by the same reference numerals as in Embodiment 1 and their descriptions are omitted.

[0038] Figure 2 is a schematic diagram showing the configuration of the foreign matter removal device according to Embodiment 2. As shown in Figure 2, in the foreign matter removal device 200, the portion of the mesh belt 51 facing the conveyor belt 11 moves in the same direction D1 as the portion of the conveyor belt 11 facing the mesh belt 51, and at a faster speed than the conveyor belt 11. That is, in this embodiment, the rotation direction of the guide rollers R5, R6, R7, and R8 around which the mesh belt 51 is wrapped is the direction that moves the mesh belt 51 clockwise in Figure 2.

[0039] Thus, in this embodiment, when the electrode mixture W1 is being transported, the portion of the mesh belt 51 facing the transport belt 11 moves in the opposite direction at a faster speed than the portion of the transport belt 11 facing the mesh belt 51. Therefore, in the portion where the transport belt 11 and the mesh belt 51 face each other, a shear force is generated between the transport belt 11 and the mesh belt 51. The shear force generated between the transport belt 11 and the mesh belt 51 is applied to the electrode mixture W1 sandwiched between the transport belt 11 and the mesh belt 51.

[0040] As explained above, even if the direction of movement D2 of the mesh belt 51 changes, by creating a speed difference between the movement speed of the conveyor belt 11 and the movement speed of the mesh belt 51, and moving the mesh belt 51 relative to the conveyor belt 11, the foreign matter removal device 200 according to Embodiment 2 can easily remove foreign matter W2 from the electrode mixture W1 without relying on the magnetism of the foreign matter W2, just as the foreign matter removal device 100 according to Embodiment 1.

[0041] Furthermore, the mesh belt 51 should be configured such that the portion of the mesh belt 51 facing the conveyor belt 11 moves in the same direction D1 as the movement direction D1 of the portion of the conveyor belt 11 facing the mesh belt 51, but at a different speed than the movement speed of the conveyor belt 11, thereby generating a shear force between the mesh belt 51 and the conveyor belt 11. Therefore, the portion of the mesh belt 51 facing the conveyor belt 11 may move at a slower speed than the conveyor belt 11, but in the same direction D1 as the movement direction D1 of the portion of the conveyor belt 11 facing the mesh belt 51.

[0042] Furthermore, from the viewpoint of improving the efficiency of removing foreign matter W2, a larger speed difference between the moving speed of the conveyor belt 11 and the moving speed of the moving belt is preferable. On the other hand, it is preferable that the upper limit of this speed difference be within a range in which cracks or other defects occur in the components of the electrode mixture W1 due to the shear force applied to the electrode mixture W1. [Examples]

[0043] The following describes embodiments of this disclosure. However, this disclosure is not limited to these embodiments.

[0044] An example in which iron powder (particle size: 100 μm), which is a foreign matter W2, is removed from electrode active material powder, which is electrode composite material W1, using the foreign matter removal device 100 shown in Figure 1 will be described.

[0045] (Examples) First, a sample was obtained by mixing 10g of iron powder with 200g of electrode active material powder to incorporate the iron powder into the electrode active material powder. Next, the sample was fed from the hopper onto a stainless steel conveyor belt 11 set to a moving speed of 15cm / s and flattened. Furthermore, the sample was conveyed while sandwiched between the portion of a stainless steel mesh belt 51 facing the conveyor belt 11 and the portion of the conveyor belt 11 facing the mesh belt 51, while the portion of the mesh belt 51 facing the conveyor belt 11 was moved in the opposite direction relative to the portion of the conveyor belt 11 facing the mesh belt 51, thereby applying a shear force to the sample. Finally, the electrode active material powder that passed through the mesh of the mesh belt 51 was detached from the mesh belt 51 using a scraper 61 and collected inside a container 71.

[0046] The specifications of the mesh belt 51 used were as follows: Eye size: #400 Pitch: 63.5 μm Wire diameter: 19 μm Aperture size: 44.5 μm Opening ratio: 49.1%

[0047] Subsequently, the appearance of the electrode active material powder before and after foreign matter removal by the foreign matter removal device 100 was visually inspected. Here, Figure 3 is a photographic diagram showing the appearance of the electrode active material powder before and after foreign matter removal in the example.

[0048] As can be seen from photograph P1 in Figure 3, before foreign matter removal, it was confirmed that the electrode active material powder (electrode mixture W1) before foreign matter removal by the foreign matter removal device 100 contained white iron powder (foreign matter W2). On the other hand, as can be seen from photograph P2 in Figure 3, after foreign matter removal, it was confirmed that the electrode active material powder (electrode mixture W1) after foreign matter removal by the foreign matter removal device 100 did not contain white iron powder (foreign matter W2).

[0049] Therefore, it was found that by using the foreign matter removal device 100, foreign matter can be easily removed from the electrode mixture without relying on the magnetism of the foreign matter.

[0050] This disclosure is not limited to the embodiments described above, and can be modified as appropriate without departing from the spirit of the invention. For example, in embodiments 1 and 2 described above, foreign matter removal devices 100 and 200 were described to remove foreign matter W2 from the electrode mixture W1 which is a powder, but the electrode mixture W1 may be a slurry, paste, or wet powder obtained by mixing the powder with a solvent.

[0051] When the electrode mixture W1 contains a solvent, it is preferable that the materials of the conveyor belt 11 and the mesh belt 51 are such that the solvent in the electrode mixture W1 does not penetrate the mesh belt 51. For example, metals, resins, etc., can be used. When the electrode mixture W1 contains an organic solvent, fluororesins such as PTFE and PFA are preferred as materials for the conveyor belt 11 and the mesh belt 51 because they have superior chemical resistance compared to metals and other resins. [Explanation of Symbols]

[0052] 10 Conveyor section 11 Conveyor belt 20 Supply section 21 Hopper 30 Planarization processing unit 31 Squeegee 40 Press section 41 Press roller 50 Foreign object removal section 51 Mesh belt 60 Peeling section 61 Scraper 70 Collection section 71 Container 80 Cleaning section 81 Air blow 90 Control Unit 100, 200 Foreign matter removal device R1~R8 Guide roller W1 Electrode mixture W2 Foreign matter

Claims

1. An electrode mixture is placed on the surface, and a conveyor belt moves in one direction, A mesh belt having a mesh opening that allows the electrode mixture to pass through while preventing the passage of foreign matter of a predetermined size or larger mixed into the electrode mixture, It has, The mesh belt moves relative to the conveyor belt, thereby applying a shear force to the electrode mixture sandwiched between the conveyor belt and the mesh, and is used as a foreign matter removal device to allow the electrode mixture to pass through the mesh.

2. The foreign object removal device according to claim 1, wherein the mesh belt generates the shear force between itself and the conveyor belt by moving in the opposite direction to the direction of movement of the conveyor belt at approximately the same speed as the conveyor belt, or by moving in the same direction as the direction of movement at a different speed than the conveyor belt.

3. The foreign matter removal device according to claim 1, further comprising a flattening section for flattening the electrode mixture on the conveyor belt.

4. The foreign matter removal device according to claim 1, further comprising a pressing section for pressing the electrode mixture on the conveyor belt.

5. The foreign matter removal device according to claim 1, further comprising a peeling section for peeling off the electrode mixture that has passed through the mesh and adhered to the back surface of the mesh belt from the mesh belt.

6. The foreign matter removal device according to claim 1, further comprising a recovery unit for recovering the electrode mixture after it has passed through the mesh.

7. The foreign matter removal device according to claim 1, further comprising a cleaning unit for removing foreign matter that has not passed through the mesh but has been captured on the surface of the mesh belt from the mesh belt.

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