JP2016115578A - Electrode manufacturing method and electrode manufacturing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrode manufacturing method and an electrode manufacturing device capable of enhancing the deposition accuracy at a coating end.SOLUTION: A coating roll 2 coats a collector 80 with wet granules 90. A pull-in roll 4 faces the coating roll 2. A pair of blades 10 are provided oppositely to each other between the coating roll 2 and pull-in roll 4. A reservoir 20 is formed of the coating roll 2, pull-in roll 4, and the pair of blades 10. A pressure reduction unit 30 reduces the pressure on the outside of the blades 10. The coating roll 2 holds wet granules 90 pushed out from a clearance 22 between the coating roll 2 and pull-in roll 4, before being applied to the collector 80. The blade 10 has a through hole 14, and the ratio of the diameter of the through hole 14 to the interval of the clearance 22 is 1/20 or more.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an electrode manufacturing method and an electrode manufacturing apparatus.

  An electrode (electrode plate) such as a lithium ion battery is formed by applying a mixed material of an active material and a solvent to a current collector made of a metal foil or the like. In relation to such a technique, Patent Document 1 discloses a method for producing a coating film that can improve the uniformity of the thickness of the coating film.

  In Patent Document 1, at least one of the rolls is a coating roll having a paste holding groove, and a doctor blade pressed against the coating roll, and a measurement for measuring the pushing amount of the doctor blade during driving. A coating device is used that includes at least one means on each of the one side and the other side from the center in the roll width direction, and includes an adjusting means for adjusting the pushing amount of the doctor blade. A step of adjusting the pushing amount of the doctor blade by the adjusting means so as to cancel the imbalance of the pushing amount of the doctor blade measured by each measuring means when the paste-like composition is transferred to the substrate by the coating roll. After that, a coating film is formed. Thereby, the uniformity of the thickness of the paste film for forming a catalyst layer in the width direction of the base material (width direction of the coating roll) can be enhanced.

JP 2008-300160 A

  In the drying step of drying the mixed material applied to the current collector after the coating step, it is required to increase the solid content ratio of the mixed material in order to shorten the drying time. Therefore, a wet granulated material having a high solid content is used as the mixed material. On the other hand, a highly granulated wet granulated product has a high viscosity, and therefore its fluidity deteriorates. Therefore, it becomes difficult to control the film forming accuracy in the coating part, and the film forming accuracy may be deteriorated. In particular, the fluidity is deteriorated by using the wet granulated body, so that the wet granulated body hardly reaches the vicinity of both ends (coating end portions) in the longitudinal direction of the coated portion. Therefore, it becomes difficult to control the film formation accuracy at the coating end, and the film formation accuracy at the coating end may be deteriorated.

  In patent document 1, the uniformity of the thickness of a coating film is improved by adjusting the pushing amount of a doctor blade. However, when the pushing amount of the doctor blade is adjusted, there is a possibility that the clearance between the doctor blade and the application roll may be reduced, which may make it difficult to supply the paste from the paste reservoir to the application roll. Therefore, even if the technique of Patent Document 1 is used, it is difficult to control the film forming accuracy at the coating end, and it is difficult to improve the film forming accuracy at the coating end.

  An object of the present invention is to provide an electrode manufacturing method and an electrode manufacturing apparatus capable of improving the film forming accuracy of a coating end portion.

  An electrode manufacturing method according to the present invention is an electrode manufacturing method for manufacturing an electrode by applying a wet granulated material to a current collector, the first roll for applying the wet granulated material to the current collector, The wet granulation in a reservoir formed by a second roll facing the first roll and a pair of plate members provided opposite to each other between the first roll and the second roll The body is stored, the side opposite to the storage part of each of the pair of plate members is decompressed, and the first roll and the second roll are rotated to rotate the first roll and the second roll. The wet granule pushed out from the gap between the first granule and the wet granule is held by the first roll, and the first roll rotates while holding the wet granule and thereby the wet granule. Is applied to the current collector, and the plate member has one or more through holes, The ratio of the diameter of the through hole with respect to spacing of the gap is 1/20 or more.

  An electrode manufacturing apparatus according to the present invention is an electrode manufacturing apparatus that manufactures an electrode by applying a wet granulated material to a current collector, wherein the wet granulated material is applied to the current collector. A roll, a second roll facing the first roll, a pair of plate members provided opposite to each other between the first roll and the second roll, the first roll and the first roll Formed by the two rolls and the pair of plate members, and having a storage portion for storing the wet granulated body, and a decompression means for reducing the pressure of each of the pair of plate members opposite to the storage portion, The first roll holds the wet granulated body pushed out from the gap between the first roll and the second roll as the first roll and the second roll rotate. The first roll rotates while holding the wet granulated body. The wet granulation body is applied to the current collector, and the plate member has one or more through holes, and the ratio of the diameter of the through holes to the gap interval is 1/20 or more. .

  In the present invention, a through hole is provided in each plate material that forms the storage portion for storing the wet granulated body, and the outside of each of the pair of plate materials (opposite the storage portion) is decompressed. Yes. Thereby, the wet granulation body stored by the storage part approaches each of a pair of board | plate material. Therefore, the width of the wet granulated body extruded from the gap between the first roll and the second roll is substantially the same as the distance between the pair of plate members. Furthermore, the suction effect by the decompression means can be enhanced by setting the ratio of the diameter of the through hole to the gap interval to be 1/20 or more. Thereby, the inner side (reservation part side) of each pair of board | plate materials is pressure-reduced appropriately, and the wet granule stored by the storage part can reach | attain a board | plate material. Therefore, it is possible to improve the film forming accuracy at the coating end.

Preferably, a ratio of the diameter of the through hole to the gap is 1/20 to 1.
By setting the ratio of the diameter of the through hole to the gap interval from 1/20 to 1, it is possible to suppress drying of the wet granulated body or clogging of the wet granulated body into the through hole.

Preferably, the degree of decompression by the decompression means is -5 kPa to -50 kPa.
By setting the degree of vacuum to -5 kPa to -50 kPa, drying of the wet granulated body can be suppressed.

  ADVANTAGE OF THE INVENTION According to this invention, the electrode manufacturing method and electrode manufacturing apparatus which can improve the film-forming precision of a coating edge part can be provided.

1 is a diagram illustrating an electrode manufacturing apparatus according to a first embodiment. 1 is a diagram illustrating an electrode manufacturing apparatus according to a first embodiment. FIG. 2 is an enlarged view showing a blade according to the first exemplary embodiment. It is a figure which shows the electrode manufacturing apparatus concerning a comparative example. It is the figure which compared the film-forming precision of the coating edge part by the comparative example and Embodiment 1. FIG. It is a figure which shows the experimental result at the time of using the electrode manufacturing apparatus concerning Embodiment 1. FIG. FIG. 3 is a process diagram illustrating an electrode manufacturing method according to the first embodiment;

(Embodiment 1)
Embodiments of the present invention will be described below with reference to the drawings. Note that, in each drawing, the same element is denoted by the same reference numeral, and redundant description is omitted as necessary.

  1 and 2 are diagrams illustrating an electrode manufacturing apparatus 1 according to the first embodiment. The electrode manufacturing apparatus 1 includes a coating roll 2 (first roll), a drawing roll 4 (second roll), a transfer roll 6, and a storage unit 20 that stores the wet granulated body 90. The coating roll 2 is provided between the drawing roll 4 and the transfer roll 6. The storage unit 20 is provided between the coating roll 2 and the drawing roll 4. The pull-in roll 4 and the transfer roll 6 are opposed to each other, and a clearance 22 (gap) is provided between the pull-in roll 4 and the transfer roll 6. Thereby, it is comprised so that the clearance 22 may be provided under the storage part 20. FIG.

  The coating roll 2 rotates in the direction of arrow A (counterclockwise in FIG. 1). The drawing roll 4 rotates in the direction of arrow B (clockwise in FIG. 1). That is, the rotation direction of the drawing roll 4 is opposite to the rotation direction of the coating roll 2. Further, the transfer roll 6 rotates in the direction of arrow C (clockwise in FIG. 1). That is, the rotation direction of the transfer roll 6 is opposite to the rotation direction of the coating roll 2.

  The drawing roll 4 draws the wet granulated body 90 stored in the storage unit 20 downward in cooperation with the coating roll 2. That is, when the application roll 2 and the drawing roll 4 rotate, the wet granulated body 90 stored in the storage unit 20 is pushed downward from the clearance 22. At this time, the extruded wet granulated body 90 adheres to the surface of the coating roll 2. The coating roll 2 holds the wet granulated body 90 (wet granulated body 90a) attached to the roll surface 2a. The coating roll 2 conveys the wet granulated body 90a to the transfer roll 6 side by rotating in the arrow A direction while holding the wet granulated body 90a.

  On the other hand, the transfer roll 6 rotates in the direction of arrow C, thereby conveying the current collector 80, which is a metal foil, in the direction of arrow D, for example. When the wet granulated body 90 a is conveyed by the application roll 2 to the gap G between the application roll 2 and the transfer roll 6, the application roll 2 cooperates with the transfer roll 6 to collect the current collector in the gap G. A wet granulated body 90 a is applied (transferred) to 80. The current collector 80 to which the wet granulated body 90 (wet granulated body 90b) is applied is conveyed to the drying step, and the wet granulated body 90b applied to the current collector 80 is subjected to a drying process.

  A pair of blades 10 that are plate members are provided at both ends of the storage unit 20. The pair of blades 10 are provided opposite to each other between the coating roll 2 and the drawing roll 4. With such a configuration, the storage unit 20 is formed by the coating roll 2, the drawing roll 4, and the pair of blades 10. The storage unit 20 stores the wet granulated body 90 supplied from the outside.

  The pair of blades 10 defines the coating width of the wet granulated body 90 applied to the current collector 80. Specifically, the width of the wet granulated body 90 a attached to the application roll 2 is defined according to the distance between the pair of blades 10. That is, the width of the wet granulated body 90 a attached to the application roll 2 is equal to or less than the distance between the pair of blades 10. Then, the coating roll 2 holds the wet granulated body 90 a while maintaining its width, and applies it to the current collector 80. Accordingly, the width (coating width) of the wet granulated body 90b applied to the current collector 80 is defined according to the width of the pair of blades 10.

  In other words, the coating width is defined at the position of the clearance 22. Further, the thickness of the wet granulated body 90 attached to the coating roll 2 is defined according to the interval C1 of the clearance 22. Thus, the basis weight (mass per area) of the wet granulated body 90 is defined. Furthermore, the film thickness and density of the wet granulated body 90 applied to the current collector 80 are defined according to the gap G between the application roll 2 and the transfer roll 6. In this way, the electrode manufacturing apparatus 1 defines the film forming conditions (coating width, film thickness, density, etc.) of the wet granulated body 90 applied to the current collector 80.

  Moreover, the electrode manufacturing apparatus 1 has the pressure reduction part 30 (pressure reduction means). The decompression unit 30 is, for example, a vacuum pump. The decompression unit 30 is configured to decompress the outside of the blade 10 (the side opposite to the storage unit 20 of the blade 10). The blade 10 is provided with one or more through holes 14 as will be described later. When the decompression unit 30 decompresses the outside of the blade 10, the wet granulated body 90 stored in the storage unit 20 is pulled in the direction indicated by the arrows P <b> 1 and P <b> 2 through the through hole 14. As a result, the wet granulated body 90 approaches the blade 10. Accordingly, when the wet granulated body 90 is pushed down from the clearance 22, the width of the wet granulated body 90 is substantially the same as the distance between the pair of blades 10. Therefore, since the coating width becomes more uniform, the film forming accuracy is improved.

  FIG. 3 is an enlarged view showing the blade 10 according to the first embodiment. 3 shows the blade 10 on the front side (left side in FIG. 2) of FIG. 1, the blade 10 on the back side (right side in FIG. 2) of FIG. 1 has the same configuration. That is, the blade 10 on the back side (right side in FIG. 2) in FIG. 1 can be illustrated by turning FIG. 3 upside down.

  The lower right portion 10 a on the application roll 2 side of the blade 10 is formed to be recessed in a substantially arc shape in accordance with the shape of the curved surface (rotation surface) of the application roll 2. The coating roll 2 is in contact with the lower right portion 10a of the blade 10, and rotates in the direction of arrow A while sliding on the lower right portion 10a. Similarly, the lower left portion 10b on the pulling roll 4 side of the blade 10 is formed to be recessed in a substantially arc shape in accordance with the curved surface (rotating surface) of the pulling roll 4. The drawing roll 4 is in contact with the lower left portion 10b of the blade 10, and rotates in the direction of arrow B while sliding on the lower left portion 10b.

  As shown in FIG. 3, the blade 10 is provided with one or more through holes 14. Preferably, the through hole 14 is provided below the blade 10 (clearance 22 side). The reservoir 20 and the outer side of the blade 10 communicate with each other through the through hole 14. A plurality of through holes 14 may be provided in each blade 10. The number of through holes 14 may be determined according to the hole diameter (diameter) of the through hole 14. For example, when the diameter of the through hole 14 is large, the number of the through holes 14 may be small. On the other hand, when the hole diameter of the through hole 14 is small, the number of the through holes 14 may be large.

  As described above, the decompression unit 30 decompresses the outside of the blade 10. The reservoir 20 and the outside of the blade 10 communicate with each other through the through hole 14. As a result, the vicinity of the blade 10 of the reservoir 20 is depressurized. Therefore, the wet granulated body 90 stored in the storage unit 20 moves so as to approach the blade 10. Therefore, the wet granulated body 90 stored in the storage unit 20 extends to the blades 10 on both sides. Thereby, the width of the wet granulated body 90 in the vicinity of the clearance 22 is substantially the same as the interval between the pair of blades 10.

  Here, when the hole diameter of the through hole 14 is d, the through hole 14 is preferably formed so that the ratio (d / C1) of the hole diameter d to the interval C1 of the clearance 22 is 1/20 or more. Yes. Furthermore, the through hole 14 is formed so that d / C1 is 1 or less. Further, preferably, the decompression unit 30 decompresses the outside of the blade 10 so that the degree of decompression (indicating how much the decompression is performed with respect to the atmospheric pressure) is −5 kPa to −50 kPa. “Decompression degree: −50 kPa” indicates that the pressure is reduced from atmospheric pressure to 50 kPa. That is, “the degree of decompression is −50 kPa or less” indicates that the pressure at which the pressure is reduced from the atmospheric pressure is 50 kPa or less. The range of the hole diameter d and the range of the degree of reduced pressure will be described later.

(Comparative example)
FIG. 4 is a diagram illustrating an electrode manufacturing apparatus 100 according to a comparative example. FIG. 4 shows the application roll 2, the drawing roll 4, and a pair of blades 110. Although not shown in FIG. 4, the electrode manufacturing apparatus 100 also includes a transfer roll 6 in the same manner as the electrode manufacturing apparatus 1 according to the first embodiment. Similarly to the first embodiment, the application roll 2, the drawing roll 4, and the pair of blades 110 form a storage portion 20 that stores the wet granulated body 90. As in the first embodiment, a clearance 22 (gap) is provided between the drawing roll 4 and the transfer roll 6. By rotating the coating roll 2 and the drawing roll 4, the wet granulated body 90 stored in the storage unit 20 is pushed downward from the clearance 22. Similarly to the first embodiment, the pair of blades 110 defines the coating width of the wet granulated body 90 applied to the current collector 80.

  In addition, the electrode manufacturing apparatus 100 according to the comparative example includes a pushing means (not shown) for pushing the wet granulated body 90 stored in the storage unit 20 from above. In the comparative example, the coating accuracy (film formation accuracy) is adjusted by controlling the amount of pushing by this pushing means. That is, by increasing the pushing amount, the amount of the wet granulated body 90 attached to the coating roll 2 from the clearance 22 increases. Further, when the pushing amount is increased, the width (coating width) of the wet granulated body 90 attached to the coating roll 2 is increased. On the other hand, in the comparative example, unlike the first embodiment, the blade 110 is not provided with a through hole. The outside of the blade 110 is not decompressed.

  Here, when adjusting the film forming accuracy of the highly granulated wet granulated body 90, the fluidity of the wet granulated body 90 is poor. Therefore, the method of controlling the indentation amount improves the coating accuracy. Is difficult. That is, even when the amount of pushing is increased, the wet granulated body 90 may not reach the vicinity of the blade 110. Therefore, the film formation accuracy (particularly, the film formation accuracy at the coating end) may not be improved. Further, the film forming accuracy may be deteriorated depending on the material characteristics of the wet granulated body. That is, the fluidity of the powder deteriorates due to the specific surface area and the TAP density of the active material contained in the wet granulated body, which may deteriorate the film forming accuracy.

  FIG. 5 is a diagram in which the film forming accuracy at the coating end is compared between the comparative example and the first embodiment. FIG. 5A is a diagram in which the wet granulation 90 is applied to the current collector 80 in the comparative example. (B) shows the state in which the wet granulated body 90 was applied to the current collector 80 in the first embodiment.

  As shown to Fig.5 (a), in the comparative example, the coating end part 90c becomes uneven, and the coating width is not constant. The reason why the coating width is not constant in the comparative example is that the width of the wet granulated body 90 that is pushed out from the clearance 22 and adheres to the coating roll 2 is not constant. On the other hand, as shown in FIG. 5B, in the first embodiment, the coating end 90c is substantially straight, and the coating width is substantially constant. That is, in the first embodiment, the wet granulated body 90 reaches the blade 10 in the vicinity of the clearance 22 of the reservoir 20 by reducing the pressure outside the blade 10. As a result, the width of the wet granulated body 90 that is pushed out from the clearance 22 and adheres to the coating roll 2 substantially matches the distance between the pair of blades 10. Therefore, the width (coating width) of the coating end portion 90c in the current collector 80 is substantially constant.

  Therefore, in the first embodiment, even when the wet granulated body 90 is used, it is possible to improve the film forming accuracy of the coating end portion. Thereby, even when the wet granulated body 90 is used, the defect rate can be reduced. Furthermore, since the highly granulated wet granulated body 90 can be applied to the current collector 80, the drying time in the drying process can be shortened. This also makes it possible to shorten the drying furnace. In addition, since the wet granulated body 90 that is highly solid-differentiated can be applied to the current collector 80, the amount of the solvent can be reduced.

(Experimental result)
FIG. 6 is a diagram illustrating experimental results when the electrode manufacturing apparatus 1 according to the first embodiment is used. “◯” shown in FIG. 6 indicates that the pass / fail judgment is “good”, and that the film formation accuracy is improved as compared with the case where the electrode manufacturing apparatus 100 according to the comparative example is used. On the other hand, “x” shown in FIG. 6 indicates a case where the pass / fail judgment is “No”, and indicates that the film formation accuracy is equal to or lower than that of the comparative example.

  Experimental conditions are shown below. The clearance C1 is set to 100 [μm]. Moreover, the hole diameter d is 3, 5, 50, 100, or 150 [μm] as shown in FIG. Moreover, as shown in FIG. 6, the pressure reduction degree is −5, −10, −30, −50, or −75 [kPa]. Moreover, the compounding ratio (weight%) of the wet granulation body 90 (mixed material) is active material: CMC (thickening agent): binder = 98-98.5: 0.5-1.0: 1. 0. Further, for example, a graphite material is used as the active material. As binders, polyvinylidene fluoride (PVdF), methyl cellulose (MC), carboxymethyl cellulose (CMC: Carboxymethyl Cellulose), hydroxypropyl cellulose (HPC: Hydroxypropyl Cellulose), polyvinyl butyral (PVB: PolyVinyl) Butylal, polyethylene (PE: PolyEthylene), polyvinyl alcohol (PVA: PolyVinyl Alcohol), polytetrafluoroethylene (PTFE: PolyTetraFluoroEthylene), or styrene butadiene rubber (SBR) is used.

  As shown in FIG. 6, when the degree of decompression is −10 kPa and the hole diameter d is 3 μm, that is, when the ratio (d / C1) of the hole diameter d to the clearance C1 of the clearance 22 is 3/100, the suction effect is obtained. No, the pass / fail judgment is negative. This is because when d = 3 [μm], the hole diameter d is too small compared to the interval C1 of the clearance 22, and because of pressure loss or the like, the inside of the blade 10 (near the blade 10 of the reservoir 20). ) Is not properly decompressed. When the hole diameter d is 3 μm, even if the degree of vacuum is increased from −10 kPa (for example, even if the degree of vacuum is −30 kPa), the suction effect is hardly improved due to pressure loss or the like.

  On the other hand, when the degree of decompression is −10 kPa and the hole diameter d is 5 μm, that is, when the ratio (d / C1) of the hole diameter d to the clearance C1 of the clearance 22 is 5/100 (= 1/20) Judgment is good. That is, when d / C1 = 1/20, the inside of the blade 10 is appropriately depressurized, so that the wet granulated body 90 stored in the storage unit 20 reaches the blade 10 in the storage unit 20. Therefore, when d / C1 = 1/20, the film formation accuracy (particularly the film formation accuracy at the coating end) is improved. Similarly, when the degree of decompression is −10 kPa and the hole diameter d is 50 μm (d / C1 = 50/100 = 1/2), the pass / fail judgment is good. Further, when the degree of decompression is −10 kPa and the hole diameter d is 100 μm (d / C1 = 100/100 = 1), the pass / fail judgment is also good.

  On the other hand, when the degree of decompression is −10 kPa and the hole diameter d is 150 μm (d / C1 = 150/100 = 30/20), the pass / fail judgment is negative. In this case, when d = 150 [μm], the hole diameter d is too large compared to the clearance C1 of the clearance 22, and the liquid such as the medium contained in the wet granulated body 90 is excessively sucked. As a result, the wet granulated body 90 is dried to such an extent that the film formation accuracy cannot be maintained. In this case, the hole diameter d is too large compared to the clearance C1, and the wet granulated body 90 enters the through hole 14 and the through hole 14 is clogged. Therefore, in this case, the pass / fail determination is negative. When the hole diameter d is 150 μm, even if the degree of vacuum is lowered from −10 kPa (for example, even if the degree of vacuum is −5 kPa), drying of the wet granulated body 90 or clogging of the through holes 14 may occur. There is almost no improvement effect.

  In addition, when the degree of decompression is −5 kPa and the hole diameter d is 5 μm, 50 μm, and 100 μm, the pass / fail judgment is good. Similarly, when the degree of decompression is −30 kPa and the hole diameter d is 5 μm, 50 μm, and 100 μm, the pass / fail judgment is good. Similarly, when the degree of decompression is −50 kPa and the hole diameter d is 5 μm, 50 μm, and 100 μm, the pass / fail judgment is good.

  Therefore, when d / C1 ≧ 1/20, the inside of the blade 10 is appropriately depressurized, and the wet granulated body 90 stored in the storage unit 20 reaches the blade 10, so that the film formation accuracy (particularly the coating end) is reached. The film forming accuracy of the portion is improved. Furthermore, when 1/20 ≦ d / C1 ≦ 1, it is possible to suppress drying of the wet granulated body 90 or clogging of the wet granulated body 90 into the through hole 14.

  Further, when the degree of decompression is −75 kPa and the hole diameter d is 50 μm, the pass / fail judgment is negative. This is because the degree of vacuum is too high, so that the liquid contained in the wet granulated body 90 is excessively sucked, and the wet granulated body 90 is dried to such an extent that the film forming accuracy cannot be maintained. Therefore, when the degree of vacuum is −5 kPa to −50 kPa, drying of the wet granulated body 90 can be suppressed.

(Electrode manufacturing method)
FIG. 7 is a process diagram illustrating the electrode manufacturing method according to the first embodiment. In step S102, the wet granulated body 90 is supplied from a previous step (for example, a kneading step) of the coating step by a conveying means (not shown). As a result, the wet granulated body 90 is stored in the storage unit 20. In step S <b> 104, as described above, the decompression unit 30 decompresses the outside of the blade 10. Here, preferably, the decompression unit 30 decompresses the outside of the blade 10 so that the degree of decompression is -5 kPa to -50 kPa.

  In step S106, as described above, the coating roll 2 and the drawing roll 4 rotate. As a result, the wet granulated body 90 stored in the storage unit 20 is pushed downward from the clearance 22. In step S <b> 108, as described above, the coating roll 2 holds the wet granulated body 90 pushed downward from the clearance 22. In step S110, as described above, the coating roll 2 rotates while holding the wet granulated body 90 (wet granulated body 90a). Thereby, the coating roll 2 applies the wet granulated body 90 a to the current collector 80. In step S112, as described above, the transfer roll 6 transports the current collector 80 coated with the wet granulated body 90 (wet granulated body 90b) to the drying process. Thus, a drying means (not shown) such as a drying furnace dries the wet granulated body 90b applied to the current collector 80.

(Modification)
Note that the present invention is not limited to the above-described embodiment, and can be changed as appropriate without departing from the spirit of the present invention. For example, the order of the steps shown in FIG. 7 can be arbitrarily changed, and one or more of the steps may be performed simultaneously. For example, step S104 and step S106 may be exchanged in order or may be performed simultaneously.

  Further, although the push amount control is performed in the comparative example, the push amount control may be performed also in the present embodiment. In the above-described embodiment, the interval C1 of the clearance 22 is set to 100 μm, but is not limited thereto. The hole diameter d of the through hole 14 can be determined according to the interval C1 of the clearance 22. Moreover, the hole diameter d of the through hole 14 may not be the same for all of the plurality of through holes 14 provided in the blade 10.

DESCRIPTION OF SYMBOLS 1 Electrode manufacturing apparatus 2 Application | coating roll 4 Pull-in roll 6 Transfer roll 10 Blade 14 Through-hole 20 Storage part 22 Clearance 30 Decompression part 80 Current collector 90 Wet granulation body

Claims (4)

An electrode manufacturing method for manufacturing an electrode by applying a wet granulated material to a current collector,
A first roll for applying the wet granulation body to the current collector, a second roll facing the first roll, and a gap between the first roll and the second roll. Storing the wet granulated material in a storage part formed by a pair of provided plate members,
Each of the pair of plate members is depressurized on the side opposite to the storage portion,
The first roll holds the wet granulated body pushed out from the gap between the first roll and the second roll by the rotation of the first roll and the second roll. And
The first roll applies the wet granulation to the current collector by rotating while holding the wet granulation,
The said board | plate material has one or more through-holes, The ratio of the diameter of the said through-hole with respect to the space | interval of the said clearance gap is 1/20 or more. Electrode manufacturing method. The electrode manufacturing method according to claim 1, wherein a ratio of a diameter of the through hole to an interval of the gap is 1/20 to 1. The electrode manufacturing method according to claim 1, wherein a degree of pressure reduction by the pressure reducing unit is −5 kPa to −50 kPa. An electrode manufacturing apparatus for manufacturing an electrode by applying a wet granulated material to a current collector,
A first roll for applying the wet granulated body to the current collector;
A second roll facing the first roll;
A pair of plate members provided opposite to each other between the first roll and the second roll;
A storage section that is formed by the first roll, the second roll, and the pair of plate members, and stores the wet granulated body;
Each of the pair of plate members, and a decompression means for decompressing the opposite side of the storage portion,
The first roll holds the wet granulated body pushed out from the gap between the first roll and the second roll by the rotation of the first roll and the second roll. And
The first roll applies the wet granulation to the current collector by rotating while holding the wet granulation,
The said board | plate material has one or more through-holes, The ratio of the diameter of the said through-hole with respect to the space | interval of the said clearance gap is 1/20 or more. Electrode manufacturing apparatus.

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