WO2011118589A1 - 電極板製造装置 - Google Patents
電極板製造装置 Download PDFInfo
- Publication number
- WO2011118589A1 WO2011118589A1 PCT/JP2011/056858 JP2011056858W WO2011118589A1 WO 2011118589 A1 WO2011118589 A1 WO 2011118589A1 JP 2011056858 W JP2011056858 W JP 2011056858W WO 2011118589 A1 WO2011118589 A1 WO 2011118589A1
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- WIPO (PCT)
- Prior art keywords
- original plate
- electrode
- punching
- electrode plate
- support
- Prior art date
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
- B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
- B26F1/38—Cutting-out; Stamping-out
- B26F1/384—Cutting-out; Stamping-out using rotating drums
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
- B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
- B26F1/38—Cutting-out; Stamping-out
- B26F1/40—Cutting-out; Stamping-out using a press, e.g. of the ram type
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/0404—Machines for assembling batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/049—Processes for forming or storing electrodes in the battery container
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
- B26D5/00—Arrangements for operating and controlling machines or devices for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
- B26D5/20—Arrangements for operating and controlling machines or devices for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting with interrelated action between the cutting member and work feed
- B26D5/30—Arrangements for operating and controlling machines or devices for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting with interrelated action between the cutting member and work feed having the cutting member controlled by scanning a record carrier
- B26D5/32—Arrangements for operating and controlling machines or devices for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting with interrelated action between the cutting member and work feed having the cutting member controlled by scanning a record carrier with the record carrier formed by the work itself
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
- B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
- B26F1/38—Cutting-out; Stamping-out
- B26F1/40—Cutting-out; Stamping-out using a press, e.g. of the ram type
- B26F2001/407—Cutting-out; Stamping-out using a press, e.g. of the ram type stepwise sequential punching processes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/131—Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T83/00—Cutting
- Y10T83/465—Cutting motion of tool has component in direction of moving work
- Y10T83/4766—Orbital motion of cutting blade
- Y10T83/4795—Rotary tool
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T83/00—Cutting
- Y10T83/647—With means to convey work relative to tool station
- Y10T83/6476—Including means to move work from one tool station to another
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T83/00—Cutting
- Y10T83/869—Means to drive or to guide tool
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T83/00—Cutting
- Y10T83/869—Means to drive or to guide tool
- Y10T83/8789—With simple revolving motion only
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T83/00—Cutting
- Y10T83/869—Means to drive or to guide tool
- Y10T83/8821—With simple rectilinear reciprocating motion only
Definitions
- the present invention relates to an electrode plate manufacturing apparatus.
- This application claims priority on March 26, 2010 based on Japanese Patent Application No. 2010-073169 filed in Japan, the contents of which are incorporated herein by reference.
- a battery cell has been used as a power source for various electric devices.
- a secondary battery which is a battery cell that can be repeatedly charged and discharged, may be used as a power buffer for a power generator or the like in addition to a power source.
- a stacked type in which a plurality of positive plates and negative plates are laminated via a separator, and a winding in which one positive plate and one negative plate are wound via a separator.
- an electrode active material is coated on the surface of the current collector of the electrode plate (positive electrode plate or negative electrode plate).
- a method for producing a laminated electrode plate a method disclosed in Patent Document 1 can be cited.
- Patent Document 1 an electrode active material is applied to the surface of a sheet-like current collector to form an original plate, and then the original plate is die-cut using a punching die (Thomson die).
- the board is manufactured.
- the punching die is obtained by fixing a strip-shaped punching blade (Thomson cutter) to a support substrate vertically and attaching a pressing member made of an elastic material while covering the punching blade.
- the pressing member protrudes from the support substrate rather than the punching blade. That is, since the punching blade is embedded in the pressing member, the cutting edge of the punching blade is hidden by the pressing member, and it does not appear that the punching blade is inside the pressing member.
- the present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide an electrode plate manufacturing apparatus that prevents detachment of an electrode active material as much as possible during die cutting of an electrode plate and improves manufacturing yield.
- an object of the present invention is to provide an electrode plate manufacturing apparatus that prevents detachment of an electrode active material as much as possible during die cutting of an electrode plate and improves manufacturing yield.
- An electrode plate manufacturing apparatus includes: an original plate support portion that can support an original plate of an electrode plate coated with an electrode active material; and a first cut portion that forms a linear first cut portion on the original plate.
- a first support substrate that is disposed opposite to the original plate support portion and to which the first extraction blade is fixed; a second extraction blade that forms a linear second cutting portion on the original plate And a second support substrate that is disposed opposite to the original plate support portion and to which the second punching blade is fixed; and a drive unit that drives the first and second support substrates.
- the first cutting portion is formed by the first punching blade; when the second support substrate is driven by the drive portion, the first cutting is performed.
- the second cutting edge causes the second cutting portion to be the first cutting portion with the second punching blade. It is formed so as Waru.
- the first punching blade forms the first cutting portion
- the second punching blade forms the second cutting portion with respect to the original plate on which the first cutting portion is formed.
- a portion where the first cut portion and the second cut portion intersect is a portion constituting a corner in the die-cut electrode plate. In this way, the two sides constituting the corners of the electrode plate are cut at different timings. Therefore, unlike the case where two sides continuous with the corner are cut simultaneously, it is avoided that the original plate is compressed simultaneously from the two sides, so that the detachment of the electrode active material is reduced and prevented.
- the electrode active material can be prevented from being detached at the corners of the electrode plate, and the manufacturing yield can be improved.
- FIG. 2B is a cross-sectional view taken along line A-A ′ of FIG. 2A. It is a perspective view which shows schematic structure of the electrode plate manufacturing apparatus of 1st Embodiment. It is a top view of the electrode manufacturing apparatus of 1st Embodiment. It is a side view of the electrode manufacturing apparatus of 1st Embodiment. It is a top view of a cutting die.
- FIG. 5B is a sectional view taken along line B-B ′ of FIG. 5A. It is a top view which shows the original plate and cutting part in a die cutting process.
- FIG. 1 is an exploded perspective view showing a configuration example of a battery cell
- FIG. 2A is a plan view showing an example of an electrode plate
- FIG. 2B is a cross-sectional view taken along the line A-A ′ of FIG. 2A.
- the battery cell 1 is equipped with the battery container 10 which stores electrolyte solution inside.
- the battery cell 1 is, for example, a lithium ion secondary battery. Since the electrode plate manufacturing apparatus of this embodiment can be applied to any battery cell that is manufactured by punching out an electrode plate, it is not limited to the shape and material of the battery container.
- the battery container 10 of this example is a hollow container made of aluminum and has an outer shape of a substantially prismatic shape (substantially rectangular parallelepiped shape).
- the battery container 10 includes a container body 11 having an opening and a lid 12 that closes the opening and is joined to the container body 11.
- the lid 12 is provided with electrode terminals 13 and 14.
- the electrode terminal 13 is a positive terminal and the electrode terminal 14 is a negative terminal.
- a plurality of electrode plates 15 and 16 and a plurality of separators 17 are accommodated inside the battery container 10.
- the electrode plate 15 is a positive electrode plate, and the electrode plate 16 is a negative electrode plate.
- the plurality of electrode plates 15 and 16 are repeatedly arranged so that the positive electrode plates and the negative electrode plates are alternately arranged.
- the separator 17 is disposed between the pair of electrode plates 15 and 16 so that the electrode plates 15 and 16 are not in direct contact with each other.
- the separator 17 is made of a porous insulating material or the like, and allows electrolytic components such as lithium ions to pass through. Actually, a plurality of positive plates, a plurality of negative plates, and a plurality of separators are laminated to form a laminate.
- the battery cell 1 has a structure in which the stacked body is accommodated in a battery container 10. The electrolytic solution is stored inside the battery container 10 so as to be in contact with the electrode plates 15 and 16.
- the electrode plate 15 has an electrode main body 150 and an electrode tab 151.
- the electrode body 150 has, for example, a substantially rectangular planar shape, and has a pair of long sides 152 and 153 and a pair of short sides 154 and 155.
- the electrode tab 151 is formed so as to protrude outside the electrode main body 150 with the short side 155 of the electrode main body 150 as a base end.
- the direction in which the electrode tab 151 protrudes is a direction substantially orthogonal to the short side 155 and along the main surface of the electrode main body 150.
- the electrode tab 151 is formed so as to be biased to one of the short sides 155.
- the electrode tabs 151 of the plurality of electrode plates 15 are collectively connected to the electrode terminals 13.
- the electrode plate 15 has a current collector 156 and an electrode active material 157.
- the current collector 156 is made of, for example, aluminum or copper, and has a sheet shape with a thickness of, for example, about several tens of ⁇ m.
- the electrode active material 157 is made of a forming material corresponding to the type of the electrolytic solution, and is provided on both surfaces of the current collector 156.
- the thickness of the electrode active material 157 is, for example, about several tens of ⁇ m to several hundreds of ⁇ m.
- the electrode plate 15 has an electrode main body 150 to which the electrode active material 157 is applied and an electrode tab 151 to which the electrode active material 157 is not applied.
- the electrode tab 151 is obtained by punching the current collector 152 as will be described later.
- the electrode plate 16 is formed of a different material for the electrode active material as described above, and the electrode body portion is formed to have a size larger than that of the electrode plate 15, but the structure and shape are the same as those of the electrode plate 15. As shown in FIG. 1, the electrode tab 161 of the electrode plate 16 is disposed so as not to overlap the electrode tab 151 of the electrode plate 15.
- the electrode tabs 161 of the plurality of electrode plates 16 are collectively connected to the electrode terminals 14.
- the electrode plate manufacturing apparatus according to the present invention can be used for manufacturing either a positive electrode plate or a negative electrode plate.
- an example in which the electrode plate manufacturing apparatus is applied to an electrode plate 15 that is a positive electrode plate will be described.
- FIG. 3 is a perspective view illustrating a schematic configuration of the electrode plate manufacturing apparatus according to the first embodiment
- FIG. 4A is a top view of the electrode plate manufacturing apparatus
- FIG. 4B is a side view of the electrode plate manufacturing apparatus
- FIG. FIG. 5B is a cross-sectional view taken along the line BB ′ in FIG. 5A
- FIG. 5B is a plan view of the first punching blade and the second punching blade in plan view of the first and second punching dies from the surface opposite to FIG.
- the electrode plate manufacturing apparatus 2 of this embodiment includes an original plate support unit 20, a drive system 3, a first punching die 4, and a second punching die 5.
- the first punching die 4 has a first support substrate 40, a set of first punching blades 41 and a set of second punching blades 42 fixed to the first support substrate 40. .
- These two punching blades are aligned in the same position in the Y direction, which is the transport direction, and do not overlap in the X direction.
- these two punching blades are provided at positions symmetrical with respect to an imaginary line drawn from the center in the X direction of the formation region 92 in the Y direction as the transport direction.
- the second punching die 5 includes a second support substrate 50, a set of third punching blades 51 corresponding to the first punching blade 41 fixed to the second support substrate 50, and the second punching die 51. And a set of fourth punching blades 52 corresponding to the punching blades. These two punching blades are aligned and arranged at the same position in the Y direction and corresponding to the punching blades of the first punching die 4 corresponding in the X direction. Specifically, these two punching blades are provided at positions symmetrical with respect to an imaginary line drawn from the center in the X direction of the formation region 92 in the Y direction as the transport direction.
- the first to fourth punching blades are constituted by, for example, Thomson blades.
- the first punching die 4 is provided with a first pressing portion 43 so as to cover the periphery of the first and second punching blades
- the second punching die 5 has a third and a third pressing portion.
- a second pressing portion 53 is provided so as to cover the periphery of the four punching blades.
- the drive system 3 includes transport rollers 21 to 24 as a transport unit, a control unit 30, a drive unit 31, and holding units 32 and 33.
- the components of the electrode plate manufacturing apparatus 2 are arranged as follows.
- the conveyance rollers 21 and 22 are provided so as to sandwich the original plate support portion 20 in the Y direction so as to convey the protective sheet 90 along the planar upper surface 20a of the original plate support portion 20.
- the conveyance rollers 23 and 24 sandwich the original plate support unit 20 and the conveyance rollers 21 and 22 in the Y direction so as to convey the original plate 91 disposed on the protective sheet 90 on the upper surface 20a in the Y direction in the same manner as the protective sheet 90.
- the Y direction is the transport direction of the original plate 91 or the stamped electrode plate by the transport rollers 21 to 24. As shown in FIG.
- the transport rollers 23 and 24 for transporting the original plate 91 are disposed below ( ⁇ Z direction) than the transport rollers 21 and 22 for transport of the protective sheet 90.
- Such an arrangement of the transport rollers can generate tension on the original plate 91 and prevent the original plate 91 from wrinkling, so that the electrode plate can be appropriately punched.
- the protective sheet 90 is, for example, a resin sheet, and is used to prevent the punching blades from coming into contact with the upper surface 20a of the master plate support portion 20 when the punching blades are cut through the master plate 91. This is to prevent blade damage.
- the drive unit 31 is provided above (+ Z direction) the original plate support unit 20. One end of each drive unit 31 is disposed on the same surface, and supports 34 to 37 that move up and down by the drive unit 31 are connected. Further, the holding portion 32 is connected to the other ends of the columns 34 and 35, and the holding portion 33 is connected to the other ends of the columns 36 and 37. The first punching die 4 is attached to the lower surface side of the holding portion 32, and the second punching die 5 is attached to the lower surface side of the holding portion 33. In addition, although the holding
- the electrode plate manufacturing apparatus 2 generally operates as follows.
- the control unit 30 controls the operations of the transport rollers 21 to 24 and the drive unit 31.
- the control unit 30 stops the transport rollers 21 to 24 after transporting the original plate 91 and the protective sheet 90 in synchronization with each other at a predetermined interval. That is, the control unit 30 controls the transport rollers 21 to 24 to perform an intermittent operation.
- This predetermined interval is a distance from the midpoint of each blade of the first punching blade 41 in the Y direction to the midpoint of the third punch blade 51 in the Y direction.
- the control unit 30 controls the driving unit 31 to move the holding units 32 and 33 downward ( ⁇ Z direction). Then, the first punching die 4 and the second punching die 5 move toward the upper surface 20a of the original plate support part 20, and are pressed against the original plate 91 conveyed to the upper surface 20a.
- the first to fourth cutting blades 41, 42, 51, 52 cut the original plate 91, and the first cutting portion by the first punching die 4 and the second cutting portion by the second punching die 5 on the original plate 91. Is formed. At this time, the die cutting of the electrode plate 15 is completed when the second cut portion is formed.
- the holding portions 32 and 33 move upward (+ Z direction), so that the first punching die 4 and the second punching die 5 are removed from the original plate 91. Pull out, that is, retreat upward.
- the control unit 30 controls the transport rollers 21 to 24 to transport the original plate 91 and the protective sheet 90 by the predetermined distance, and stops the transport rollers 21 to 24. After the stop, the control unit 30 controls the drive unit 31 to move the first punching die 4 and the second punching die 5 again toward the upper surface 20a of the original plate support 20.
- the first cutting part is located immediately below the second punching die, the first cutting part and the second cutting part are brought together by the movement of the original plate support part 20 again, A portion surrounded by the first cut portion and the second cut portion is die-cut from the original plate 91 as two electrode plates 15.
- the electrode plate manufacturing apparatus 2 repeats the above operation to repeatedly mold the original plate 91.
- the original plate 91 is provided with a formation region 91 in which an electrode active material is provided on both surfaces of a current collector, and a non-formation region 93 in which no electrode active material is provided.
- the non-formation region 93 is formed at both ends in the width direction (X direction) of the original plate 91.
- the electrode tab of one electrode plate is die-cut from the non-formation region 93 at one end of the original plate 91, and the electrode tab of the other electrode plate is die-cut from the non-formation region 93 at the other end.
- a third punching blade 51 and a fourth punching blade 52 are arranged so that the electrode plates with electrode tabs can be simultaneously punched.
- the first punching blade 41 has a first blade element 44 and a second blade element 45.
- the first blade element 44 is a part that forms the long side 152 of the electrode plate 15 shown in FIG. 2A by cutting the original plate 91.
- the second blade element 45 is a part that forms the long side 153.
- the first pressing portion 43 is in contact with the one surface 441 and the other surface 442 of the first blade element 44 and the one surface and the other surface of the second blade element 45, and the first support substrate 40.
- the first blade element 44 and the second blade element 45 are surrounded by the arrangement surface 40a.
- the second punching blade 42 has the same configuration.
- the third punching blade 51 has a third blade element 54 and a fourth blade element 55.
- the third blade element 54 is a part that forms the short side 154.
- the fourth blade element 55 is a part that forms the short side 155 and the electrode tab 151.
- the second pressing portion 53 is in contact with one surface and the other surface of the third blade element 54 and one surface and the other surface of the fourth blade element 55, and is disposed on the second support substrate 50. And surrounds the third blade element 54 and the fourth blade element 55.
- the fourth punching blade 52 has the same configuration.
- the first to fourth blade elements 44, 45, 54, and 55 are independent of each other, and each is formed of a single-edged strip.
- the thickness of the strip is about 0.5 mm to 2.0 mm, for example.
- the band-shaped body is provided with a cutting edge along one side in the width direction.
- the belt-like body is attached to the first support substrate 40 and the second support substrate 50 so that the width direction thereof is substantially perpendicular to the facing surface.
- the first pressing portion 43 and the second pressing portion 53 are members that press the original plate 91 toward the original plate support portion 20 when the original plate 91 is die-cut.
- the 1st press part 43 and the 2nd press part 53 consist of elastic bodies, such as rubber
- the dimension (thickness) of the normal direction of the opposing surface 40a is set so that the surface 43a of the 1st press part 43 may protrude toward the original plate support part 20 rather than the blade edge
- the pressing unit may be any member that can press the original plate 91 toward the original plate support unit 20.
- a member having a pressing surface may be urged toward the original plate support unit 20 by a spring or the like.
- the pressing part may be supported by a member different from the supporting members of the first and second punching blades. The same applies to the second pressing portion 53.
- the first punching blade 41 and the third punching blade 51 are arranged so as to satisfy the following conditions.
- a virtual first blade element 44a is obtained by virtually translating the first blade element 44 by a predetermined distance ⁇ Y in the transport direction (Y direction).
- a virtual second blade element 45a is obtained by virtually translating the second blade element 45 by a predetermined distance ⁇ Y in the transport direction.
- the virtual first blade element 44a intersects with the third and fourth blade elements 54 and 55 in a state where the opposing surface of the second support substrate 50 is viewed in plan, and the virtual second blade element 45a. Intersects with the third and fourth blade elements 54 and 55.
- the virtual first blade element 44a and the second blade element 45a may intersect with the third blade element 54 and the fourth blade element 55 so that the ends thereof overlap each other, or inside the ends. You may cross each other.
- the virtual first blade element 44 a and the second blade element 45 a both intersect the third blade element 54 and the fourth blade element 55.
- a portion surrounded by the virtual first blade element 44 a, second blade element 45 a, third blade element 54, and fourth blade element 55 has an electrode plate shape P.
- the electrode plate shape P has first extending portions P1, P2, second extending portions P3, P4, a tab forming portion P5, and first to fourth corner portions P6 to P9.
- a first extending portion P1 extends in the first direction (X direction) from the first corner portion P6, and the first extending portion P1 intersects the first extending portion P1 at the first corner portion P6.
- a second extending portion P4 extends in the direction 2 (Y direction). From the second corner portion P7, the first extension portion P1 extends in the first direction, and the second corner portion P7 is second in the second direction intersecting the first extension portion P1.
- the extending portion P3 extends. From the third corner P8, the first extension P2 extends in the first direction, and the second corner in the second direction intersecting the first extension P2 at the third corner P8.
- the extending portion P3 extends. From the fourth corner P9, the first extending portion P2 extends in the first direction, and the second corner in the second direction intersecting the first extending portion P2 at the fourth corner P9.
- the extending portion P4 extends.
- FIGS. 7A to 7C are cross-sectional views showing the process of cutting the original plate.
- 6A to 6D show one side with respect to the center line virtually drawn in the Y direction from the midpoint in the X direction of the formation region 92 of the original plate 91, but with respect to the other side not shown. The same die cutting is performed almost simultaneously.
- 7A to 7C illustrate a state in which the original plate 91 is cut by the first punching die 4, but the cutting state by the second punching die 5 is the same.
- the first die 4 is pressed against the original plate 91 in a state where the transport rollers 21 to 24 are stopped.
- the second punching die 5 is also pressed against the original plate 91 in parallel with the first punching die 4.
- a first cutting portion 94 n is formed in a first pattern corresponding to the first punching blade 41.
- the first pressing portion 43 first comes into contact with the surface of the original plate 91 (electrode active material 912). At this stage, the cutting edge is not in contact with the electrode active material 912 located on one surface of the original plate 91.
- the first punching die 4 is further moved downward, as shown in FIG. 7B, the first pressing portion 43 is pressed toward the original plate support portion 20 and is compressed and deformed, and the cutting edge comes into contact with the original plate 91. Due to the pressing force of the first pressing portion 43, the original plate 91 is pressed toward the original plate support portion 20, and the positional deviation between the original plate 91 and the first punching blade 41 is prevented.
- the cutting edge protrudes from the first pressing portion 43 toward the original plate support portion 20 and enters the original plate 91 as shown in FIG. 7C.
- the cutting edge penetrates through the electrode active material 912, the current collector 911, and the electrode active material 913 located on the other surface layer of the original plate 91, thereby cutting the original plate 91.
- the first punching die 4 is moved upward after the original plate 91 is cut, the original plate 91 is separated from the first punching blade 41 while maintaining the pressing force of the first pressing portion 43. Moving with the first punching blade 41 is avoided.
- the original plate 91 in which the first cutting portion 94 n is formed is conveyed to the downstream of a predetermined distance ⁇ Y as shown in FIG. 6B (see FIG. 5A) by the conveying direction (Y direction).
- the portion where the first cutting portion 94 n is formed faces the second punching die 5.
- first punching die 4 and the second punching die 5 are pressed against the original plate 91 again.
- a new first cut portion 94 n + 1 is formed on the original plate 91 below the first punching die 4.
- a second cutting portion 95 is formed on the original plate below the second punching die 5 in a second pattern corresponding to the second punching blade 51.
- the second cutting portion 95, the first cut portion is formed so as to cross the 94 n, the first cutting portion 94 n and the original plate 91 is a portion surrounded by the second cutting unit 95 as the electrode plate 15 Die cut.
- the original plate 91 is transported downstream in the transport direction (Y direction) by a predetermined distance ⁇ Y (see FIG. 5A).
- the new first cutting portion 94 n + 1 formed in parallel with the second cutting portion 95 is conveyed to the lower side of the second punching die 5.
- the electrode plate die-cutting device 2 repeatedly punches the original plate 91.
- the die-cut electrode plate 15 is separated from the original plate 91 by separation means (not shown) after the first die 4 and the second die 5 are separated from the original plate 91.
- a gap 96 is formed in the separated original plate.
- the original plate is cut almost simultaneously on the entire circumference of the punching blade, and the corners (also referred to as corners) of the electrode plate are from two sides that are continuous with the corners. It receives compressive force almost simultaneously.
- this compressive force exceeds a certain level, the current collector and the electrode active material are different in material and have different mechanical characteristics, so that the current collector and the electrode active material cannot be deformed following each other.
- a shearing force acts in a direction along the interface between the current collector and the electrode active material (hereinafter simply referred to as the interface), and the adhesion between the current collector and the electrode active material is reduced.
- the first pattern by the first die 4 and the second pattern by the second die 5 are formed at different timings. A portion where the pattern and the second pattern intersect becomes a corner portion of the electrode plate 15. Therefore, the maximum value of the compressive force acting on the corners of the electrode plate 15 at a time is reduced, and the decrease in the adhesion between the current collector 911 and the electrode active materials 912 and 913 is avoided at the corners of the electrode plate 15. . Therefore, it is difficult for the electrode active material to be detached from the current collector at the corners of the electrode plate 15 during the die cutting process or after die cutting.
- first punching blade 41 and the third punching blade 51 are arranged so that the first pattern and the second pattern intersect, even if the original plate 91 is misaligned, The disadvantage that the first pattern and the second pattern are not connected is avoided. Further, both end portions in the extending direction of the first punching blade 41 and the third punching blade 51 are positioned outside the portion to be the electrode plate 15. Therefore, even if the first cut blade 41 and the second cut blade 51 are cut at both ends, distortion does not adversely affect the electrode plate 15. This also applies to the relationship between the second punching blade 42 and the fourth punching blade 52.
- the first punching blade 41 and the third punching blade 51 are constituted by a single blade whose cutting edge is biased toward the surface forming the contour of the electrode plate shape P. Therefore, the portion surrounded by the first pattern and the second pattern, that is, the portion that becomes the electrode plate 15 has a smaller displacement of the cut surface than the outside of this portion. Therefore, the compressive force acting on the portion that becomes the electrode plate 15 is reduced, and the detachment of the electrode active material in the electrode plate 15 is reduced.
- the electrode plate manufacturing apparatus 2 of the first embodiment desorption of the electrode active material can be reduced. Therefore, a decrease in battery performance due to a decrease in the amount of electrode active material per electrode plate is avoided, and a high-performance battery cell can be configured. Further, exposure of the current collector due to peeling of the electrode active material is avoided, and a short circuit due to exposure of the current collector is avoided, so that it is possible to configure a battery cell that is less prone to malfunction.
- the technical scope of the present invention is not limited to the above-described embodiment. Various modifications can be made without departing from the gist of the present invention. For example, modifications described below are also conceivable.
- FIG. 8A is a plan view showing an example of an electrode plate that is die-cut by the electrode plate manufacturing apparatus of the first modification
- FIG. 8B is a plan view showing first and second punching dies in the first modification.
- the electrode plate 15B has an electrode main body 150B and an electrode tab 151.
- the planar shape of the electrode main body 150B is a substantially octagon with a rectangular corner dropped, and the inner angles are all obtuse.
- the electrode main body 150B has sides 152B to 159B.
- the sides 152B and 153B extend in the first direction (Y direction).
- the sides 154B and 155B extend in a second direction (X direction) substantially orthogonal to the first direction.
- the side 156B is continuous with the side 155B and the side 152B in the vicinity of the base end of the electrode tab 151.
- the side 157B is continuous with the side 152B and the side 154B.
- the side 158B is continuous with the side 153B and the side 154B.
- the side 159B is continuous with the side 153B and the side 155B.
- the first cutting edge is distributed so that the cutting edges are distributed in portions corresponding to the sides 156B to 159B in the electrode plate shape Q corresponding to the contour of the electrode plate 15.
- a cutting blade 41B is provided.
- the second punching die 5B is provided with a second punching blade 51B so that the cutting edge is distributed in the electrode plate shape Q in the portion corresponding to the outer periphery of the electrode tab 151 and the sides 152B to 155B.
- the electrode plate manufacturing apparatus of Modification 1 is the same as that of the first embodiment except for the first punching die 4B and the second punching die 5B.
- the die-cut electrode plate 15B has an obtuse angle at the corner of the electrode body 150B, so that the electrode active material is less likely to be detached at the corner. .
- Such an electrode plate 15B can be die-cut by an electrode plate manufacturing apparatus according to a second modification described below.
- FIG. 9 is a plan view showing a punching die in the electrode plate manufacturing apparatus according to the second modification.
- the four punching blades 51B in the second punching mold 5B of the first modification are divided into two to form the punching dies 5C and 5D. That is, here, first to third punching dies 4B, 5C, and 5D are provided.
- the second punching die 5C is provided with a third punching blade 51C so as to correspond to the sides 152B and 153B in the electrode plate shape Q.
- the third punching die 5D is provided with a fourth punching blade 51D so as to correspond to the outer sides of the sides 154B, 155B and the electrode tab 151 in the electrode plate shape Q.
- the second punching blade 51C is virtually translated by a predetermined distance in the transport direction
- the first punching blade 41B is virtually translated by twice the predetermined distance in the transport direction
- the cutting edges are distributed along the electrode plate shape Q. 9 is not limited to the pattern of the three punching dies and punching blades, but the corners of the electrode plate shape Q (the corners formed by the sides 152B and 156B, the sides 152B and 157B) by multi-stage punching as described above.
- any number of punching dies and punching blade patterns can be used as long as the corners are sequentially punched.
- the outer periphery of the electrode tab and the side 155B are connected to each other, but when the electrode plate with higher accuracy is manufactured by preventing the detachment of the electrode active material in the portion concerned In this case, it is preferable to form punching blades corresponding to punching dies different from the outer periphery of the electrode tab and the side 155B.
- FIG. 10A is a plan view showing a punching die in the electrode manufacturing apparatus of Modification 3
- FIG. 10B is an explanatory view showing the force acting on the original plate during cutting.
- the third modification is different from the first embodiment in that notches are provided in the first pressing portion and the second pressing portion, and each of the first to fourth blade elements is provided.
- a gap is provided between a portion forming part of the electrode plate shape P, the first pressing portion, and the second pressing portion.
- the first punching die 4E in the modified example 3 includes the first blade element 44 and the second blade element 45 constituting the first punching blade on the opposing surface of the first support substrate 40, and a first pressing force.
- the portion 43E is provided.
- the notch 46E is provided in a portion along the one surface 441 of the first blade element 44 on the side facing the second blade element 45.
- the one surface 441 is separated from the first pressing portion 43E by providing the notch 46E.
- the other surface 442 which is the back surface of the one surface 441 is in contact with the first pressing portion 43E in this example.
- the notch 47E is provided at a portion along one surface of the second blade element 45 facing the first blade element 44, and this one surface is separated from the first pressing portion 43E.
- the second punching die 5E is provided with third and fourth blade elements 54 and 55 constituting a second punching blade and a second pressing portion 53E on one surface of the second support substrate 50. It has a structured.
- the notch 56E is provided in a portion along one surface of the third blade element 54 on the side facing the fourth blade element 55, and this one surface is separated from the second pressing portion 53E.
- the notch 57E is provided in a portion along one surface of the fourth blade element 55 on the side facing the third blade element 54, and this one surface is separated from the second pressing portion 53E.
- the electrode plate 15 is die-cut from the original plate 91 by the electrode plate manufacturing apparatus including the first punching die 4E and the second punching die 5E configured as described above, the electrode active material is detached as described below. The effect of reducing is enhanced.
- the vicinity of the cutting portion by the first blade element 44 will be described, but the same applies to the vicinity of the cutting portions of the second to fourth blade elements 45, 54, and 55.
- the portion of the original plate 91 that is in contact with the first pressing portion 43E is pressed by the pressing force F0 of the first pressing portion 43E and the position thereof is regulated.
- the end portion 94 b including the cut surface that comes into contact with the other surface 442 receives the compression force F ⁇ b> 4 toward the outside of the first blade element 44 due to the entry of the blade edge 443 of the first blade element 44. It receives from the surface 442 and is compressed in the direction along the main surface of the original plate 91.
- the end portion 94b is limited in the range in which the end portion 94b can be deformed in the direction along the main surface of the original plate 91 by restricting the position of the portion in contact with the first pressing portion 43E. Since the distortion of the end portion 94b is difficult to be alleviated, the compressive force F4 acts on the end portion 94b in a concentrated manner. Since the end portion 94b has a limited deformable range, it is difficult to bend and deform. Therefore, the compressive force F4 acts in a direction substantially along the interface, and most of the compressive force F4 contributes to the shear force that causes the current collector 911 and the electrode active materials 912 and 913 to shift. However, since the end portion 94b is a portion that does not become an electrode plate, even if the electrode active material is peeled off from the end portion 94b, there is almost no inconvenience.
- an end portion 94c including a cut surface on the side in contact with the one surface 441 is a portion that becomes an electrode plate.
- the end portion 94c receives a compression force F3 opposite to the compression force F4 from the one surface 441, and is compressed in the normal direction of the one surface 441.
- the end portion 94c has a portion that is not pressed by the first pressing portion 43E between the portion pressed by the first pressing portion 43E and the portion that contacts the one surface 441. is doing. Since the end portion 94c has a wider displaceable range than the end portion 94b, the acting compressive stress is reduced, and the end portion 94c is easily bent and deformed.
- the tangent L of the interface at the portion where the end portion 94c contacts the one surface 441 is inclined with respect to the normal direction of the one surface 441 as the bending deformation (deflection angle) of the end portion 94c increases.
- the compressive force F3 can be decomposed into a component force F5 parallel to the tangent L and a component force F6 perpendicular to the tangent L.
- the component force F5 is a force for shifting the current collector 911 and the electrode active materials 912 and 913 in the same manner as the shearing force.
- the component force F6 is a force that causes the current collector 911 and the electrode active materials 912 and 913 to approach each other in a portion that contacts the one surface 441. That is, the component force F6 acts so that the current collector 911 and the electrode active materials 912 and 913 are in close contact with each other.
- the ratio of the component force F6 to the component force F5 increases. That is, as the inclination of the tangent L increases, the shearing force that causes the current collector 911 and the electrode active materials 912 and 913 to peel off decreases, whereas the current collector 911 and the electrode active materials 912 and 913 Increases the force of contact.
- the slope of the tangent L equal to or greater than a predetermined value, the effect of increasing the contact force due to the component force F6 is made superior to the effect of reducing the contact force due to the component force F5. Can do.
- the one surface 441 and the first pressing portion 43E are bent so that the end portion 94c is bent so that the adhesion force is secured to such an extent that the current collector 911 and the electrode active materials 912 and 913 are not peeled off.
- the interval, that is, the dimension of the notch 46E is set.
- the dimension of the notch is preferably set so that the distance between the pressing portion and the punching blade is 1 mm or more, and if it is 2 mm or more, the effect of reducing peeling of the electrode active material is enhanced. Further, from the viewpoint of reducing the positional deviation between the original plate and the punching blade in the process of die cutting, the distance is preferably 10 mm or less, and if it is 5 mm or less, the effect of reducing the positional deviation is enhanced. Thus, the interval is preferably 1 mm or more and 10 mm or less, and more preferably 2 mm or more and 5 mm or less.
- FIG. 11A is a top view showing an electrode plate manufacturing apparatus according to Modification 4 and FIG. 11B is a side view of the electrode plate apparatus according to Modification 4.
- the punching die 4F in the electrode plate manufacturing apparatus according to the modified example 4 is held by the holding portion 32F.
- the holding part 32F is supported by the columns 34 to 37.
- the punching die 4F has a structure in which first and second punching blades 41 and 51 and a pressing portion 43F are provided on the opposing surface of the support substrate 40F.
- the first punching blade 41 and the second punching blade 51 are provided on the same support substrate.
- the punching die 4F having such a structure unlike the configuration in which the first punching blade 41 and the second punching blade 51 are provided on different support substrates, a clearance between a plurality of support substrates is ensured. Therefore, the first and second punching blades 41 and 42 and the third and fourth punching blades 51 and 52 can be arranged close to each other. Therefore, the apparatus size can be reduced.
- FIG. 12A is a top view showing the electrode plate manufacturing apparatus according to the fifth modification
- FIG. 12B is a side view showing the electrode plate manufacturing apparatus according to the fifth modification.
- Modification 5 is different from the first embodiment in that it includes detection means for detecting a relative position between the first and second punching blades and a portion of the original plate to be die-cut.
- the original plate mold manufacturing apparatus of Modification 5 includes a mark forming unit 46 and a mark detection unit 25 as detection means.
- the mark forming unit 46 is disposed upstream of the mark detection unit 25 in the transport direction.
- the mark forming unit 46 forms an alignment mark that can be detected by the mark detection unit 25 on the original plate 91.
- the mark forming part 46 is provided in the first die 4G.
- the mark forming portion 46 is provided so as to come into contact with the non-forming region 93 in the original plate 91 when the first punching die 4G is pressed against the original plate 91.
- the mark forming unit 46 contacts the original plate 91 and forms a through hole as an alignment mark at the contact position. Thereby, alignment marks are formed at positions associated with the positions of the first cutting portions 94 n and 94 n + 1 shown in FIG. 6A.
- the mark detection unit 25 is provided on the original plate support unit 20.
- the mark detection unit 25 includes a light receiving element and the like, and detects the position of the through hole by detecting light passing through the through hole formed by the mark forming unit 46. Since the mark detection unit 25 is disposed in the vicinity of the original plate 91, the position of the through hole can be detected with high accuracy.
- the mark detection unit 25 is electrically connected to the control unit 30 and outputs a detection result to the control unit 30. Based on the detection result of the mark detection unit 25, the control unit 30 controls the transport rollers 21 to 24 so that the first cutting unit is transported to a predetermined position. As a result, the relative position of the first cutting portion with respect to the second punching blades 51 and 52 can be controlled with high accuracy, and the electrode plate 15 with high accuracy can be punched out.
- a coating material may be attached to the original plate 91 in the position linked
- alignment marks may be provided in advance on the original plate 91 at regular intervals, for example.
- the first punching blade can be brought into contact with the original plate at a position associated with the position of the alignment mark.
- the contact position between the original plate and the first punching blade is known, and the contact position between the original plate and the first punching blade is substantially detected.
- the mark detection unit 25 may be provided above the original plate support unit 20.
- the second embodiment is different from the first embodiment in that a cylindrical punching die is provided instead of the flat punching die.
- FIG. 13 is a perspective view showing a schematic configuration of the electrode plate manufacturing apparatus according to the second embodiment
- FIG. 14A is a plan development view of the first and second punching blades
- FIG. 14B is an explanatory view showing a die cutting process.
- the electrode plate manufacturing apparatus 7 of the present embodiment includes an original plate support unit 20, a drive system 8, a first rotating body 83, and a second rotating body 84.
- the drive system 8 includes transport rollers 21 to 24 as a transport unit, a control unit 80, and a drive unit 81.
- the first and second rotating bodies 83 and 84 are provided with a punching blade, for example, a rolling die cutter, fixed to a support substrate that is deformed into a cylindrical shape.
- the first and second rotating bodies 83 and 84 are rotationally controlled by the control unit 80.
- the control unit 80 controls the rotation of the transport rollers 21 to 24 and displaces the original plate 91 and the protective sheet 90 in the transport direction at a predetermined displacement speed.
- the drive unit 81 is controlled by the control unit 80 to rotate the first rotating body 83 and the second rotating body 84 at the same peripheral speed as the displacement speed. Thereby, the 1st rotary body 83 and the 2nd rotary body 84 are rotated so that it may contact with respect to the original plate 91, without slipping.
- the first rotating body 83 is provided with first punching blades 85a and 85b on the outer peripheral surface of a columnar support portion.
- the first rotating body 83 is supported so as to be rotatable around the central axis C1.
- the central axis C1 is parallel to the upper surface 20a of the original plate support part 20 and orthogonal to the transport direction.
- two sets of first punching blades 85a and 85b are provided at positions symmetrical with respect to an imaginary line drawn in the Y direction as the transport direction from the center in the X direction of the formation region 92 of the original plate 91. ing.
- the first rotating body 83 As the first rotating body 83 rotates, the first rotating body 83 is arranged so that the first punching blades 85a and 85b come into contact with the original plate 91 supported by the upper surface 20a.
- the second rotating body 84 is provided with second punching blades 86a and 86b on the outer peripheral surface of a columnar support portion.
- the diameter of the support portion of the second rotating body 84 is set to the same diameter as that of the first rotating body 83. Thereby, it becomes easy to make the circumferential speed of the 1st rotary body 83 and the 2nd rotary body 84 uniform.
- the second rotating body 84 is supported so as to be rotatable around a central axis C2 substantially parallel to the central axis C1.
- two sets of second punching blades 86a and 86b are provided at positions symmetrical with respect to an imaginary line drawn in the Y direction as the transport direction from the center in the X direction of the formation region 92 of the original plate 91. ing. With the rotation of the second rotating body 84, the second rotating body 84 is arranged so that the second punching blades 86a and 86b are in contact with the original plate 91 supported by the upper surface 20a.
- the planar shape of the first punching blades 85a and 85b is the same pattern as that of the first embodiment in a state in which the outer peripheral surface of the support portion constituting the first rotating body 83 is flattened. (See FIG. 5A).
- the electrode plate to be punched has a symmetrical shape with respect to a virtual line in the X-axis direction drawn at the midpoint in the Y-axis direction.
- the first punching blades 85a and 85b extend in the axial direction of the support portion.
- Reference sign L1 in FIGS. 13 and 14A is a reference line indicating a position of the first punching blades 85a and 85b that first contacts the original plate 91 of the part to be punched.
- Reference numeral L2 is a reference line indicating a position of the second punching blades 86a and 86b that first contacts the original plate 91 of the part to be punched.
- the first rotating body 83, the second rotating body 84, and the transport rollers 21 to 24 rotate without stopping in the process of punching the electrode plate.
- the first punching blade 85a forms a first cutting section 97a in contact with the original plate 91 to the time t 0.
- the first cut portion 97a is a portion corresponding to the long side 152 of the electrode plate 15 (refer to FIG. 2A below).
- the original plate 91 is conveyed in parallel with the rotation of the first rotating body 83 and the second rotating body 84, and the first cutting portion 97 a comes into contact with the second rotating body 84 at time t 1 .
- the first cutting portion 97a is closest to the second rotating body 84, the vicinity of the reference line L2 of the second rotating body 84 comes into contact with the original plate 91.
- the second cut portions 98 a and 98 b are portions corresponding to a part of the short sides 154 and 155 of the electrode plate 15 and a part of the electrode tab 151.
- Time t 2 the first punching blade 85b to form a first cutting portion 97b in contact with the original plate 91.
- the first cutting part 97 b is a part corresponding to the long side 153 of the electrode plate 15.
- the time t 3 the first punching blade 85a forms a first cutting portion 97c in contact with the original plate 91.
- the first cut portion 97c is a portion corresponding to the long side 152 of the electrode plate to be punched out next.
- die cutting of the electrode plate is completed. In the same manner, the electrode plate is continuously die-cut.
- the first cutting portion and the second cutting portion corresponding to the two sides that are continuous with the corners of the electrode plate 15 are formed at different timings.
- the electrode active material is less likely to be detached from the current collector at the corners of the electrode plate 15.
- the surface of the original plate 91 is compared with the flat punching die. It is possible to reduce the size of the device in the direction along the line. Since the original plate 91 can be removed while being conveyed, the original plate 91 can be efficiently removed as much as the conveyance is not stopped.
- the above electrode plate manufacturing apparatus it is possible to prevent the electrode active material from being detached as much as possible when the electrode plate is die-cut, and to improve the manufacturing yield.
- First support substrate, 40F ... Support substrate, 40a ... ⁇ An opposing surface, 41, 41B, 42 ... 1st punching blade, 43, 43E ... 1st press part, 43F ... Press part, 43a ... 44, first blade element, 44a ... virtual first blade element, 45 ... second blade element, 45a ... virtual second blade element, .. Mark formation part (detection means), 46E, 47E ... notch, 50 ... second support substrate, 51, 51B, 51C, 51D, 52 ... second punch blade, 53, 53E .. second pressing portion, 54... Third blade element, 55... Fourth blade element, 56E, 57E. 83... First rotating body, 84... Second rotating body, 85 a, 85 b...
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Abstract
Description
本願は、2010年3月26日に、日本に出願された特願2010-073169号に基づき優先権を主張し、その内容をここに援用する。
このうち、積層型の電極板の製造方法の一例としては、特許文献1に開示されている方法が挙げられる。
支持台に支持されている原板に抜き型を押し付けると、押さえ部材が圧縮変形して、抜き刃が押さえ部材よりも支持基板から突出するようになる。原板が、押さえ部材の押圧力により支持台に向かって押圧されるとともに、抜き刃により切断され、この結果、電極板が形成される。
特許文献1では、抜き刃の形状が片刃であると、電極板の切断面の負荷をかけないので、バリや電極活物質のクラックが生じるおそれはほとんどないとしている。
本発明の一態様に係る電極板製造装置は、電極活物質が塗工された電極板の原板を支持可能な原板支持部と;前記原板に直線状の第1の切断部を形成する第1の抜き刃と;前記原板支持部に対向配置され、前記第1の抜き刃が固定された第1の支持基板と;前記原板に直線状の第2の切断部を形成する第2の抜き刃と;前記原板支持部に対向配置され、前記第2の抜き刃が固定された第2の支持基板;、前記第1および第2の支持基板を駆動する駆動部と;を有し、前記駆動部により前記第1の支持基板が駆動した際、前記第1の抜き刃により前記第1の切断部が形成され;前記駆動部により前記第2の支持基板が駆動した際、前記第1の切断部が形成された前記原板に対し、前記第2の抜き刃により前記第2の切断部が前記第1の切断部と交わるように形成される。
したがって、上記角に連続する2辺を同時に切断する場合と異なり、当該2辺から同時に原板が圧縮されることが回避されるので、電極活物質の脱離が低減、防止される。
本例の電池容器10は、アルミニウム製の中空容器であり、外形が略角柱状(略直方体状)である。電池容器10は、開口を有する容器本体11と、この開口を塞いで容器本体11に接合された蓋12とを有している。
電極タブ151が突出する方向は、短辺155に略直交し、かつ電極本体部150の主面に沿う方向である。電極タブ151は、短辺155の片方に偏らせて形成されている。複数の電極板15の電極タブ151が一括して、電極端子13と電気的に接続されている。
電極板16は、上述のように電極活物質の形成材料が異なり、また、電極本体部の寸法が電極板15よりも大きく形成されるが、構造や形状については電極板15と同様である。図1に示したように電極板16の電極タブ161は、電極板15の電極タブ151と重ならないように配置されている。複数の電極板16の電極タブ161を一括して、電極端子14と電気的に接続している。
次に、第1実施形態の電極板製造装置について説明する。本発明に係る電極板製造装置は、正極板、負極板のいずれの製造に用いることも可能であるが、ここでは正極板である電極板15に適用した例を説明する。
第1の抜き型4は、第1の支持基板40と、第1の支持基板40に固定される1組の第1の抜き刃41および1組の第2の抜き刃42を有している。これら2つの抜き刃は、搬送方向であるY方向の同一位置であって且つX方向に重ならないよう整列配置されている。具体的には、これら2つの抜き刃は、形成領域92のX方向の中心から搬送方向であるY方向に引いた仮想の線に対して線対称の位置に設けられている。
第2の抜き型5は、第2の支持基板50と、第2の支持基板50に固定される上記第1の抜き刃41に対応する1組の第3の抜き刃51および上記第2の抜き刃に対応する1組の第4の抜き刃52とを有している。これら2つの抜き刃は、Y方向の同一位置であって且つX方向でそれぞれ対応する第1の抜き型4の抜き刃に対応する位置に整列配置されている。具体的には、これら2つの抜き刃は、形成領域92のX方向の中心から搬送方向であるY方向に引いた仮想の線に対して線対称の位置に設けられている。
第1の抜き刃41とそれに対応する第3の抜き刃51との形状を組み合わせると電極板形状となる。同様に、第2の抜き刃42とそれに対応する第4の抜き刃52との形状を組み合わせると電極板形状となる。
すなわち、第1の抜き型4と第2の抜き型5により、同時に同形状の2つの電極板15を形成できるよう構成される。
後述のように、第1の抜き型4には、第1及び第2の抜き刃の周囲を覆って第1の押圧部43が設けられ、第2の抜き型5には、第3及び第4の抜き刃の周囲を覆って第2の押圧部53が設けられている。
駆動系3は、搬送部としての搬送ローラー21乃至24、制御部30、駆動部31および保持部32、33により構成されている。
搬送ローラー21、22は、原板支持部20の平面状の上面20aを沿わせるように保護シート90を搬送すべく、Y方向において原板支持部20を挟むように設けられている。搬送ローラー23、24は、上面20a上の保護シート90の上に配置される原板91を保護シート90と同じくY方向に搬送すべく、原板支持部20及び搬送ローラー21、22をY方向において挟んで設けられている。ここで、Y方向が、搬送ローラー21乃至24による原板91または型抜きされた電極板の搬送方向になっている。
図4Bに示すように、原板91の搬送用である搬送ローラー23、24は、保護シート90の搬送用である搬送ローラー21、22よりも下方(-Z方向)に配置されている。各搬送ローラーのこのような配置により原板91に張力を発生させ、原板91にしわが寄ることを防止できるので、適切に電極板の型抜きを行うことができる。
保護シート90は例えば樹脂シートであり、上記各抜き刃が原板91を貫通して切断した際に、これら各抜き刃が原板支持部20の上面20aに当たらないようにするためのもの、すなわち抜き刃の損傷防止のためのものである。
第1の抜き型4は保持部32の下面側に取付けられており、第2の抜き型5は保持部33の下面側に取付けられている。
なお、ここでは、保持部32と保持部33とを別構成としているが、これらをまとめて1つの保持部として構成してもよい。
制御部30は、搬送ローラー21乃至24および駆動部31の動作を制御する。まず、制御部30は、所定の間隔だけ原板91及び保護シート90を同期させて搬送した後に、搬送ローラー21乃至24を停止させる。すなわち、制御部30は、間欠動作をするよう搬送ローラー21乃至24を制御する。
この所定の間隔は、1組からなる第1の抜き刃41のそれぞれの刃のY方向の中点から第3の抜き刃51の刃のY方向の中点までの距離である。
なお、このとき、第2の切断部の形成時に電極板15の型抜きが完成する。
当該停止の後、制御部30が駆動部31を制御して第1の抜き型4および第2の抜き型5を再度、原板支持部20の上面20aに向けて移動させる。上記搬送の結果、第1の切断部が第2の抜き型の直下に位置しているので、原板支持部20の再度の移動により第1の切断部と第2の切断部とが合わさり、第1の切断部および第2の切断部に囲まれる部分が、2つの電極板15として原板91から型抜される。
電極板製造装置2は、上記の動作を繰り返して、原板91を繰返し型抜する。
原板91の一端の非形成領域93から1つの電極板の電極タブを型抜きし、他端の非形成領域93からもう1つの電極板の電極タブを型抜きし、先述のとおり、合計2つの電極タブ付の電極板を同時に型抜きできるように第3の抜き刃51および第4の抜き刃52が配置されている。
第2の抜き刃42も同様の構成である。
第4の抜き刃52も同様の構成である。
第1の押圧部43は、その表面43aが刃先443よりも原板支持部20に向かって突出するように、対向面40aの法線方向の寸法(厚み)が設定されている。押圧部は、原板91を原板支持部20に向けて押圧可能なものであればよく、例えば押圧面を有する部材がバネ等により原板支持部20に向けて付勢されているものでもよい。また、押圧部が、第1、第2の抜き刃の支持部材とは別の部材に支持されていてもよい。第2の押圧部53も同様である。
仮想的な第1の刃要素44aおよび第2の刃要素45aは、第3の刃要素54および第4の刃要素55と互いの端部が重なるように交わってもよいし、端部より内側で互いに交差して交わってもよい。ここでは、仮想的な第1の刃要素44aおよび第2の刃要素45aが、いずれも第3の刃要素54および第4の刃要素55と交差するようになっている。
仮想的な第1の刃要素44a、第2の刃要素45a、および第3の刃要素54、第4の刃要素55に囲まれる部分は、電極板形状Pをなしている。原板が電極板形状Pで型抜きされることにより、図2Aの電極板15が形成される。
従って、図2Aに示した電極板15の輪郭は、電極板形状Pと略一致する。電極板形状Pは、第1の延在部P1、P2、第2の延在部P3、P4、タブ形成部P5、および第1~第4の角部P6~P9を有している。
第2の角部P7から、第1の方向に第1の延在部P1が延在し、第2の角部P7で第1の延在部P1と互いに交差する第2の方向に第2の延在部P3が延在している。
第3の角部P8から、第1の方向に第1の延在部P2が延在し、第3の角部P8で第1の延在部P2と互いに交差する第2の方向に第2の延在部P3が延在している。
第4の角部P9から、第1の方向に第1の延在部P2が延在し、第4の角部P9で第1の延在部P2と互いに交差する第2の方向に第2の延在部P4が延在している。
第1の抜き型4をさらに下方に移動させると、図7Bに示すように、第1の押圧部43が原板支持部20に向かって押圧されて圧縮変形し、刃先が原板91に接触する。第1の押圧部43の押圧力により、原板91が原板支持部20に向かって押圧され、原板91と第1の抜き刃41との位置ずれが防止される。
なお、型抜きされた電極板15は、第1の抜き型4および第2の抜き型5が原板91から離れた後に、図示略の分離手段により原板91から分離される。当該分離された後の原板には、空隙部96が生じることとなる。
この点は、第2の抜き刃42と第4の抜き刃52との関係においても、同様である。
なお、本発明の技術範囲は上述の実施形態に限定されるものではない。本発明の主旨を逸脱しない範囲内で多様な変形が可能であり、例えば次に説明するような変形例も考えられる。
電極本体部150Bの平面形状は、矩形の角を落とした略8角形になっており、内角がいずれも鈍角になっている。
変形例1の電極板製造装置によれば、型抜された電極板15Bは、電極本体部150Bの角部の内角が鈍角になるので、角部での電極活物質の脱離が生じにくくなる。このような電極板15Bは、次に説明する変形例2の電極板製造装置により型抜することもできる。
第2の抜き型5Cには、電極板形状Qのうちで辺152B、153Bに対応するように、第3の抜き刃51Cが設けられている。第3の抜き型5Dには、電極板形状Qのうちで辺154B、155Bおよび電極タブ151の外周に対応するように、第4の抜き刃51Dが設けられている。
第2の抜き刃51Cを搬送方向に所定の距離だけ仮想的に平行移動させ、さらに第1の抜き刃41Bを搬送方向に所定の距離の2倍だけ仮想的に平行移動させると、これらを合わせた刃先が電極板形状Qに沿って分布するようになっている。
なお、図9のような3つの抜き型および抜き刃のパターンに限られず、上述のように多段階での打ち抜きで電極板形状Qの角部(辺152Bと156Bからなる角、辺152Bと157Bからなる角、辺154Bと157Bからなる角、辺154Bと158Bからなる角、辺153Bと158Bからなる角、辺153Bと159Bからなる角、辺155Bと159Bからなる角、辺155Bと156Bからなる角)を順次打ち抜く構成であれば、抜き型の数、抜き刃のパターンはいかようなものでもよい。
また、電極板形状Qのうち電極タブの外周と辺155Bとは接続されている抜き刃としているが、当該部分の電極活物質の脱離を防止してより精度の高い電極板を製造する場合には、電極タブの外周と辺155Bとは別の抜き型にそれぞれ対応する抜き刃を構成するのがよい。
端部94bは、第1の押圧部43Eに当接している部分の位置が規制されていることにより、原板91の主面に沿う方向で変形可能な範囲が限定される。端部94bの歪が緩和されにくいので、端部94bに圧縮力F4が集中的に作用する。端部94bは、変形可能な範囲が限定されているので、曲げ変形しにくい。したがって、界面に略沿う方向に圧縮力F4が作用し、圧縮力F4のほとんどが、集電体911と電極活物質912、913とにずれを生じさせるせん断力に寄与してしまう。ただし、端部94bは、電極板にならない部分であるので、端部94bに電極活物質の剥離を生じたとしても不都合を生じることはほとんどない。
変形例3では、集電材911と電極活物質912、913とが剥離しない程度に密着力が確保されるように、端部94cをたわませるべく、一面441と第1の押圧部43Eとの間隔すなわち切欠46Eの寸法が設定されている。
このような構造の抜き型4Fにあっては、第1の抜き刃41と第2の抜き刃51とが、互いに異なる支持基板に設けられる構成と異なり、複数の支持基板の間のクリアランスを確保する必要がなくなるので、第1及び第2の抜き刃41、42と第3及び第4の抜き刃51、52とを接近させて配置することが可能になる。従って、装置サイズを小型にすることができる。
なお、マーク形成部としては、例えば第1の切断部の位置と関連付けられる位置にて原板91に塗料を付着されるものであってもよい。また、マーク形成部46を設ける代わりに、アライメントマークが例えば等間隔で原板91に予め設けられていてもよい。この場合には、アライメントマークを検出した結果に基づいて、アライメントマークの位置と関連付けられる位置にて原板に第1の抜き刃を接触させることができる。結果として、原板と第1の抜き刃との接触位置が既知となり、原板と第1の抜き刃との接触位置が実質的に検出されていることになる。原板91を通してアライメントマークを検出することが難しい場合には、マーク検出部25を原板支持部20の上方に設けるとよい。
次に、第2実施形態の電極板製造装置について説明する。第2実施形態が第1実施形態と異なる点は、平板状の抜き型に代えて円柱状の抜き型を備えている点である。
これにより、第1の回転体83、および第2の回転体84は、原板91に対して滑ることなく接触するように、回転させられる。
第1の抜き刃85a、85bは、支持部の軸方向に延在している。図13、図14Aにおける符号L1は、第1の抜き刃85a、85bのうちで、型抜対象部分の原板91に最初に接触する位置を示す基準線である。符号L2は、第2の抜き刃86a、86bのうちで、型抜対象部分の原板91に最初に接触する位置を示す基準線である。
時間t4で、電極板の型抜きが完了する。以下同様にして連続的に電極板を型抜するようになっている。
Claims (6)
- 電極活物質が塗工された電極板の原板を支持可能な原板支持部と;
前記原板に直線状の第1の切断部を形成する第1の抜き刃と;
前記原板支持部に対向配置され、前記第1の抜き刃が固定された第1の支持基板と;
前記原板に直線状の第2の切断部を形成する第2の抜き刃と;
前記原板支持部に対向配置され、前記第2の抜き刃が固定された第2の支持基板と;
前記第1および第2の支持基板を駆動する駆動部と;
を有し、
前記駆動部により前記第1の支持基板が駆動した際、前記第1の抜き刃により前記第1の切断部が形成され;
前記駆動部により前記第2の支持基板が駆動した際、前記第1の切断部が形成された前記原板に対し、前記第2の抜き刃により前記第2の切断部が前記第1の切断部と交わるように形成される;
電極板製造装置。 - 前記駆動部は、前記第1および第2の支持基板を前記原板支持部に向かって進退可能に駆動する;
請求項1に記載の電極板製造装置。 - 制御部と;
前記原板支持部を介して前記原板を搬送する搬送ローラーと;
をさらに有し、
前記制御部は、前記搬送ローラーを間欠動作させ;前記原板が前記原板支持部上の第1の位置に配置された際、前記搬送ローラーを停止させて前記第1の支持基板を前記原板支持部に向かって進出させることで前記第1の切断部を形成し;前記第1の切断部が形成された前記原板が第2の位置に配置された際、前記搬送ローラーを停止させて前記第2の支持基板を前記原板支持部に向かって進出させることで前記第2の切断部を形成する;
請求項2に記載の電極板製造装置。 - 前記第1の支持基板は第1の回転体に固定され;
前記第2の支持基板は前記第1の回転体に並べて配置された第2の回転体に固定され;
前記駆動部は、前記第1及び第2の回転体を回転駆動することで、前記第1の切断部と前記第2の切断部とを異なるタイミングで形成する;
請求項1に記載の電極板製造装置。 - 制御部と;
前記原板支持部を介して前記原板を搬送する搬送ローラーと;
をさらに有し、
前記制御部は、前記搬送ローラーと前記第1及び第2の回転体とを同一速度で回転させる;
請求項4に記載の電極板製造装置。 - 前記第1の支持基板に固定され、前記第1の抜き刃と所定間隔を空けて配置された第1の押圧部と;
前記第2の支持基板に固定され、前記第2の抜き刃と所定間隔を空けて配置された第2の押圧部と;
をさらに有する
請求項3または請求項5に記載の電極板製造装置。
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JP2017132019A (ja) * | 2016-01-29 | 2017-08-03 | 株式会社豊田自動織機 | 電極製造装置 |
Also Published As
Publication number | Publication date |
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JP2011204613A (ja) | 2011-10-13 |
JP5383571B2 (ja) | 2014-01-08 |
US20130019732A1 (en) | 2013-01-24 |
CN202917576U (zh) | 2013-05-01 |
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