JP6182925B2 - Cutting device - Google Patents

Description

  The present invention relates to a cutting device for cutting a strip including a metal foil for an electrode of a power storage device.

  An electrode used in a power storage device such as a lithium ion secondary battery or an electric double layer capacitor is usually coated with a paste of an electrode active material on a long metal foil, dried, processed by rolling, etc. It is manufactured by producing a long belt-like body in which an active material layer is laminated and then cutting it into a desired dimension by a cutting device.

  As a cutting device for cutting the strip-like body, for example, a cutting device that transports the strip-like body intermittently in a certain direction and cuts it with a mold or the like is known (for example, see Patent Document 1). In addition, a cutting device that sequentially cuts with a roller cutter while conveying a belt-like body is also known (see, for example, Patent Document 2).

JP 2001-297754 A Japanese Patent Laid-Open No. 10-032001

  However, the cutting apparatus as described in Patent Document 1 cuts the strip by running it intermittently and cannot cut continuously while running, so the machine cycle time becomes longer. On the other hand, the cutting device as described in Patent Document 2 can cut the band-like body continuously, but cuts the width direction of the band-like body at a time while being transported. Since sufficient tension cannot be applied to the body, problems such as occurrence of burrs on the cut surface and wrinkles due to the strips are likely to occur.

  This invention is made | formed in view of the subject which the said prior art has, and cuts the strip | belt-shaped body containing the metal foil for electrodes of an electrical storage apparatus which can reduce a machine cycle time and can suppress generation | occurrence | production of a burr | flash and a wrinkle. An object of the present invention is to provide a cutting device.

  In order to achieve the above object, the present invention is a cutting device for cutting a strip including a metal foil for an electrode of a power storage device, a roller cutter, and a receptacle disposed to face the roller cutter, The roller cutter has a drum-shaped roller body rotatable around a rotation axis, and a cutting blade formed in a spiral shape on the outer peripheral surface of the roller body, and the roller body is cut by the cutting There is provided a cutting device having a cam shape in which a root portion of a blade is raised, and cutting the belt-like body with the roller cutter and the receiving tool.

  In the above-described cutting device, instead of cutting the belt-like body at once in the width direction, one end side of the spirally formed cutting blade comes into contact with the belt-like body to start cutting, and the cutting proceeds in accordance with the rotation of the roller cutter. The cutting is completed on the other end side of the cutting blade. In this way, in the above cutting apparatus, the strip is gradually cut from one end to the other in the width direction, so that the occurrence of burrs on the cut surface is sufficiently suppressed and the strip is continuously conveyed while being transported. Cutting can be performed and machine cycle time can be reduced. Moreover, in the said cutting device, since a roller cutter has a cam shape, a strip | belt-shaped body moves up and down following a cam, and is cut | disconnected in the state which applied moderate tension. Therefore, it can suppress that a strip | belt shaped object twists and wrinkles arise. Furthermore, since the cam-shaped roller cutter comes into contact with the strip only at the time of cutting, particularly when the strip has an active material layer, it is possible to prevent foreign matter from being mixed into the active material layer due to contact. it can. In addition, the roller cutter does not come into contact with the belt when not cut, and the belt can be easily conveyed.

  In the cutting apparatus, the roller cutter may be arranged such that the rotation shaft is inclined with respect to the transport direction of the strip. In the above-described cutting device, the belt is gradually cut by the spirally formed cutting blade while transporting the belt-like body, and therefore, when the rotation axis of the roller cutter is perpendicular to the transport direction of the belt-like body, the cutting surface is in the transport direction The rectangular or square sheet (cut) cannot be cut out. On the other hand, the roller cutter can be adjusted so that the cutting surface is perpendicular to the transport direction by arranging the rotation axis thereof to be oblique to the transport direction of the belt-like body, The sheet can be cut out.

  In the cutting apparatus, the cutting blade has an angle formed between the surface of the band-like body and the surface on the traveling direction side of the cutting blade when the cutting edge contacts the band-like body. It may be formed to be 45 ° or more and less than 90 ° on the opposite side. By providing the cutting blade so as to satisfy the above conditions, it is possible to apply the cutting blade without countering the flow of the belt-like body being conveyed, so that the occurrence of burrs on the cut surface of the belt-like body is more sufficiently suppressed. be able to. Moreover, it becomes difficult to produce stress in a cutting blade, and the lifetime of a cutting blade can be lengthened.

  In the cutting apparatus, the receiver may have a receiving blade that meshes with the cutting blade. Thereby, a strip | belt-shaped body can be cut | disconnected more smoothly and generation | occurrence | production of the burr | flash on the cut surface of a strip | belt-shaped body can be suppressed more fully.

  ADVANTAGE OF THE INVENTION According to this invention, while being able to reduce machine cycle time, the cutting | disconnection apparatus of the strip | belt-shaped body for electrical storage apparatuses which can suppress generation | occurrence | production of a burr | flash and a wrinkle can be provided.

It is a perspective view which shows one Embodiment of the cutting unit in the cutting device of this invention. It is a perspective view which shows other one Embodiment of the cutting unit in the cutting device of this invention. It is explanatory drawing explaining a series of movement at the time of cut | disconnecting a strip | belt shaped object with a cutting | disconnection unit. It is a side view which shows one Embodiment of the cutting device of this invention. It is a top view which shows an example of the arrangement | positioning relationship between a roller cutter and a strip | belt shaped object. It is an end elevation which shows the state which the blade edge | tip of the cutting blade of a roller cutter contacted the strip | belt-shaped body.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals, and redundant description is omitted. Further, the positional relationship such as up, down, left and right is based on the positional relationship shown in the drawings unless otherwise specified. Further, the dimensional ratios in the drawings are not limited to the illustrated ratios.

  FIG. 1 is a perspective view showing an embodiment of a cutting unit in the cutting apparatus of the present invention. As shown in FIG. 1, the cutting unit 100 includes a roller cutter 10 and a plate-shaped receiving device 20 that is fixedly disposed so as to face the roller cutter 10. The roller cutter 10 includes a drum-shaped roller body 12 that can rotate around the rotation axis A, and a cutting blade 14 that is formed in a spiral shape on the outer peripheral surface of the roller body 12. Further, the roller body 12 has a cam shape in which the root portion of the cutting blade 14 is raised. The roller cutter 10 is connected to a driving device (not shown) that performs the rotational driving. On the other hand, the receiving device 20 includes a plate-like support member 22 and a receiving blade 24 that is formed in a groove shape on the surface of the support member 22 and meshes with the cutting blade 14.

  The belt-like body 40 is conveyed in the direction of arrow B in FIG. 1 and is cut between the roller cutter 10 and the receiving tool 20 by the engagement of the cutting blade 14 and the receiving blade 24. At this time, the belt-like body 40 is gradually cut according to the rotation of the roller cutter 10. That is, one end side (the right back side in FIG. 1) of the cutting blade 14 formed in a spiral shape comes into contact with the belt-like body 40, and the cutting starts. As the roller cutter 10 rotates, the cutting proceeds. Cutting is completed on the end side (the left front side in FIG. 1). In addition, the width | variety (length of the rotating shaft A direction) of the roller cutter 10 and the holder 20 is normally designed so that it may become larger than the width | variety of the strip | belt shaped object 40. FIG.

  FIG. 2 is a perspective view showing another embodiment of the cutting unit in the cutting apparatus of the present invention. A cutting unit 200 shown in FIG. 2 includes a roller cutter 10 similar to that shown in FIG. 1, and a drum-shaped receiving tool 30 disposed to face the roller cutter 10. The receiving tool 30 includes a drum-shaped support member 32 and a receiving blade 34 that is formed in a groove shape on the surface of the support member 32 and meshes with the cutting blade 14. The receiving blade 34 is spirally formed on the outer peripheral surface of the support member 32. The receiver 30 is connected to a drive device (not shown) that performs the rotational drive, and rotates in synchronization with the rotation of the roller cutter 10. In the cutting unit 200, as in the case of the cutting unit 100, the belt-like body 40 is cut between the roller cutter 10 and the receiving tool 30 by the engagement of the cutting blade 14 and the receiving blade 34.

  The material of the roller body 12 and the support members 22 and 32 is not particularly limited, and examples thereof include metal and hard rubber. Further, the material of the cutting blade 14 and the receiving blades 24 and 34 is not particularly limited, and examples thereof include metals.

  The cam shape of the roller body 12 is not particularly limited, and protrudes so that the distance from the rotation axis A of the root portion of the cutting blade 14 on the surface of the roller body 12 is longer than the distance from the rotation axis A of other parts. It only has to be. The greater the protrusion of the base portion of the cutting blade 14, the greater the tension that can be applied to the strip 40 during cutting. From the viewpoint of sufficiently suppressing the generation of wrinkles by applying an appropriate tension to the belt-like body 40, the distance from the rotation axis A of the base portion of the cutting blade 14 is from the rotation axis A of the other non-projecting portion. The distance is preferably 1.2 times or more, more preferably 1.5 times or more, and particularly preferably 2.0 times or more. On the other hand, from the viewpoint of suppressing excessive tension on the belt-like body 40, the distance from the rotation axis A of the base portion of the cutting blade 14 is 4.0, which is the distance from the rotation axis A of the other non-projecting portion. It is preferably less than or equal to twice, and more preferably less than or equal to 3.0 times.

  The spiral pitch of the cutting blade 14 is not particularly limited. However, if the cutting blade 14 makes one or more rounds on the outer peripheral surface of the roller body 12, it is not preferable because the cutting blade 14 is always in contact with the strip 40. From the viewpoint of enabling the belt-like body 40 having a desired length to be conveyed in a state where the cutting blade 14 is not in contact with the belt-like body 40, one end to the other end of the cutting blade 14 are formed in the circumferential direction of the roller body 12. The area is preferably 2/3 or less of the roller body 12 and more preferably half or less. On the other hand, from the viewpoint of smoothly cutting the belt-shaped body 40, the region where one end to the other end of the cutting blade 14 is formed in the circumferential direction of the roller body 12 is 1/5 or more of the roller body 12. Is preferable, and it is more preferable that it is 1/4 or more.

  The band-shaped body 40 has, for example, a structure in which a long metal foil serving as a current collector and an active material layer including an electrode active material formed on one surface or both of the metal foil are laminated. The active material layer is formed, for example, by applying a paste or gel containing an electrode active material on the surface of the metal foil and then performing a treatment such as drying and rolling. The active material layer may be formed on the entire surface of the metal foil, or may be formed at a predetermined interval by a method such as intermittent coating.

  The strip 40 is used as an electrode of a power storage device. Examples of the power storage device include secondary batteries such as lithium ion secondary batteries and capacitors such as electric double layer capacitors. As the metal foil and the electrode active material constituting the strip 40, materials corresponding to the power storage device to be manufactured are used.

  For example, when the power storage device is a lithium ion secondary battery, examples of the metal foil include copper foil, aluminum foil, stainless steel foil, and nickel foil. Examples of the negative electrode active material include graphite, highly oriented graphite, carbon such as mesocarbon microbeads, hard carbon, and soft carbon, alkali metals such as lithium and sodium, metal compounds, SiOx (0.5 ≦ x ≦ 1.5) And metal oxides such as boron and carbon added with boron. Examples of the positive electrode active material include composite oxide, metallic lithium, and sulfur. The composite oxide includes at least one of manganese, nickel, cobalt, and aluminum and lithium. The active material layer may contain a binder in addition to the electrode active material. Examples of the binder include PTFE dispersion, carboxymethyl cellulose, styrene butadiene rubber and PVDF, and a mixture of two or more thereof.

  The thickness of metal foil is 5-30 micrometers normally, Preferably it is 10-20 micrometers. As for the thickness of an active material layer, the single side | surface is 30-100 micrometers normally, Preferably it is 50-80 micrometers.

  In the cutting units 100 and 200, the portion where the metal foil and the active material layer of the belt-like body 40 are laminated may be cut, or when the active material layer is formed at a predetermined interval, You may cut | disconnect only the part of metal foil in which the active material layer is not formed.

  In addition, the strip | belt shaped object 40 may consist only of metal foil. In this case, an active material layer is formed after cutting.

  3A to 3E are explanatory views (end views) for explaining a series of movements when the strip unit 100 is cut by the cutting unit 100. FIG. As shown in FIG. 3A, when the cutting blade 14 of the roller cutter 10 faces upward (in the opposite direction to the belt-like body 40), the roller cutter 10 is not in contact with the belt-like body 40. . When the roller cutter 10 rotates and the cutting blade 14 moves toward the strip 40, the roller cutter 10 comes into contact with the strip 40 and pushes down the strip 40 as shown in FIG. Next, as shown in FIG. 3C, the cutting blade 14 of the roller cutter 10 and the receiving blade 24 of the receiving tool 20 are engaged with each other, and the belt-like body 40 is cut. At this time, since the roller main body 12 has a cam shape, the belt-like body 40 is pushed downward from the state of FIG. 3B to the state of FIG. Therefore, it is suppressed that the band-like body 40 is twisted and wrinkled at the time of cutting. When the cutting is completed as shown in FIG. 3D, the cut sheet (cut object) 42 is pushed out as it is by the rotation of the roller cutter 10 and is collected as a target object. Even during the cutting, the belt-like body 40 is conveyed in the direction of the arrow B without stopping, and the next cutting is performed again as shown in FIG. In this way, the strip 40 is continuously cut.

  In the cutting apparatus of the present invention, the configuration other than the cutting units 100 and 200 is not particularly limited. FIG. 4 is a side view showing an embodiment of the cutting device of the present invention. The cutting device 500 shown in FIG. 4 is cut into a reel 50 on which a long belt-like body 40 is wound, guide rollers 52, 54, 56, 58, 60 that transport the belt-like body 40, and a cutting unit 100. And a collection tray 72 that collects the cut sheet 42. Although not shown, the cutting device 500 includes a driving device that drives the reel 50, the guide rollers 52, 54, 56, 58, and 60 and the roller cutter 10 to rotate. The guide rollers 52, 54, 56, 58, 60 are preferably formed of at least a surface of a steel roller made of chrome plating so as to have wear resistance, but the outer surface is elastic such as hard rubber. It may be covered with a body.

  In the cutting device 500, the belt-like body 40 unwound from the reel 50 is conveyed to the cutting unit 100 by the guide rollers 52, 54, 56, 58 and 60. In the cutting unit 100, the strip 40 is cut as described above, and the cut sheet 42 slides down the inclined table 70 by its own weight and is collected in the collection tray 72. Thus, the sheet | seat 42 cut | disconnected by the desired dimension can be obtained. This sheet 42 is used as an electrode of a power storage device.

  In the above-described cutting units 100 and 200, the belt 40 is gradually cut by the cutting blade 14 formed in a spiral shape while the belt-shaped body 40 is transported, so that the rotation axis A of the roller cutter 10 is in the transport direction B of the belt-shaped body 40. When it is vertical, the cut surface is inclined with respect to the conveyance direction B, and the planar shape of the cut sheet 42 is a parallelogram (other than a rectangle and a square) having no right angle. The planar shape of the cut sheet 42 depends on the rotational speed of the roller cutter 10, the spiral pitch of the cutting blade 14, and the transport speed of the belt 40, and the rotational speed is fast and the spiral pitch is long and transported. By reducing the speed, the planar shape approaches a rectangle or a square. These conditions can be adjusted as appropriate.

  Further, by arranging the roller cutter 10 so that the rotation axis A thereof is inclined with respect to the transport direction B of the belt-like body 40, the cut surface can be adjusted to be perpendicular to the transport direction B. The rectangular or square sheet 42 can be cut out. FIG. 5 is a top view illustrating an example of an arrangement relationship between the roller cutter 10 and the belt-like body 40. As shown in FIG. 5, the roller cutter 10 can be arranged so that the rotation axis A of the roller cutter 10 is inclined with respect to the conveyance direction B of the strip 40. At this time, as shown in FIG. 5, in the roller cutter 10, one end side at which the cutting blade 14 starts to cut the belt-like body 40 becomes the upstream side in the transport direction of the belt-like body 40, and the cutting blade 14 cuts the belt-like body 40. It arrange | positions so that the other end side completed may become the downstream of the conveyance direction of the strip | belt shaped object 40. FIG. Further, the receivers 20 and 30 are also arranged obliquely with respect to the transport direction B of the belt-like body 40 in accordance with the roller cutter 10. The angle (acute angle) θ1 formed between the rotation axis A of the roller cutter 10 and the conveyance direction B of the belt-like body 40 is appropriately adjusted so that the cut sheet 42 has a desired shape such as a rectangle or a square. Although not particularly limited, it is usually 45 ° or more and less than 90 °, preferably 60 ° or more and less than 90 °, from the viewpoint of smoothly cutting. In order to cut out the sheet 42 having a rectangular or square planar shape, the movement distance of the band 40 moving in the direction of arrow B between the start of cutting of the band 40 and the end of cutting is determined by the width W of the band 40. X tan θ1), that is, it may be adjusted so as to coincide with the value of X in the figure. The rotational speed of the roller cutter 10, the helical pitch of the cutting blade 14, the transport speed of the strip 40, and the angle θ1 are adjusted so as to satisfy this condition.

  It is preferable that the rotation speed of the roller cutter 10 and the conveyance speed of the belt-like body 40 coincide with each other when the belt-like body 40 is cut. Both speeds may be different at the time of non-cutting. For example, the conveyance speed of the belt-shaped body 40 may be always constant, and only the rotation speed of the roller cutter 10 may be changed between cutting and non-cutting.

  In the roller cutter 10, the cutting blade 14 may extend in the tangential direction of the surface of the roller body 12 provided with the cutting blade 14 as shown in FIGS. 1 and 2, and is inclined from the normal direction. Also good. FIG. 6 is an end view showing a state where the cutting edge of the cutting blade 14 of the roller cutter 10 is in contact with the belt-like body 40. In the roller cutter 10 shown in FIG. 6, the cutting blade 14 is inclined from the normal direction. The cutting blade 14 has an angle θ2 formed by the surface of the belt-like body 40 and the surface F on the traveling direction side of the cutting blade 14 so that the angle θ2 is 45 ° or more and less than 90 ° on the opposite side of the conveyance direction B of the belt-like body 40. Preferably it is formed. The angle is more preferably 60 ° or more and less than 90 °. By providing the cutting blade 14 so as to satisfy the above conditions, the cutting blade 14 can be applied without opposing the flow of the belt-like body 40 being conveyed. While being able to suppress enough, it is hard to apply excessive stress to the cutting blade 14, Therefore The lifetime of the cutting blade 14 can be lengthened.

  As mentioned above, although this invention was demonstrated in detail based on the suitable embodiment, this invention is not limited to the said embodiment.

  For example, in the above-described embodiment, the case where the receivers 20 and 30 include the receiving blades 24 and 34 has been described, but the receiving blades 24 and 34 are not essential. For example, in FIG. 1, the receiving tool 20 may be a plate-like member composed only of the support member 22 without a groove, or in FIG. 2, the receiving tool 30 is composed only of the support member 32 without a groove. It may be a drum-shaped member. Moreover, when the receiving tool 30 is a member comprised only by the support member 32, the said member may be fixed without rotating.

DESCRIPTION OF SYMBOLS 10 ... Roller cutter, 12 ... Roller main body, 14 ... Cutting blade, 20, 30 ... Receiving tool, 22, 32 ... Support member, 24, 34 ... Receiving blade, 40 ... Band-shaped body, 100, 200 ... Cutting unit, 500 ... Cutting device.

Claims (6)

A cutting device for cutting a strip including a metal foil for an electrode of a power storage device,
A roller cutter, and a receiver disposed opposite the roller cutter,
The roller cutter has a drum-shaped roller body rotatable around a rotation axis, and a cutting blade formed in a spiral shape on the outer peripheral surface of the roller body,
The roller body has a cam shape in which a root portion of the cutting blade is raised,
The roller cutter is disposed above the strip,
The roller cutter is configured such that the roller body has a cam shape so that the belt body comes into contact with the band-like body at the time of cutting and pushes down the band-like body, and is in a non-contact state with the band-like body after cutting. And when the cutting blade of the roller cutter is facing upward , the roller cutter and the belt-like body are configured to be in a non-contact state,
A cutting device that cuts the belt-like body with the roller cutter and the receiver.   The cutting apparatus according to claim 1, wherein the roller cutter is disposed such that the rotation shaft is inclined with respect to the transport direction of the belt-like body.   In the cutting blade, the angle formed between the surface of the band-like body at the time when the blade edge contacts the band-like body and the surface on the rotation direction side of the roller cutter in the cutting blade is in the transport direction of the band-like body. The cutting device according to claim 1, wherein the cutting device is formed to be 45 ° or more and less than 90 ° on the opposite side.   The cutting device according to any one of claims 1 to 3, wherein the receiving member has a receiving blade that meshes with the cutting blade. A cutting device for cutting a strip including a metal foil for an electrode of a power storage device,
A roller cutter, and a receiver disposed opposite the roller cutter,
The roller cutter has a drum-shaped roller body rotatable around a rotation axis, and a cutting blade formed in a spiral shape on the outer peripheral surface of the roller body,
The roller body has a cam shape in which a root portion of the cutting blade is raised,
The roller cutter is disposed above the strip,
The roller cutter is configured such that the roller body has a cam shape so that the belt body comes into contact with the band-like body at the time of cutting and pushes down the band-like body, and is in a non-contact state with the band-like body after cutting. And
In the cutting blade, the angle formed between the surface of the band-like body at the time when the blade edge contacts the band-like body and the surface on the rotation direction side of the roller cutter in the cutting blade is in the transport direction of the band-like body. It is formed to be 45 ° or more and less than 90 ° on the opposite side,
A cutting device that cuts the belt-like body with the roller cutter and the receiver. A cutting device for cutting a strip including a metal foil for an electrode of a power storage device,
A roller cutter, and a receiver disposed opposite the roller cutter,
The roller cutter has a drum-shaped roller body rotatable around a rotation axis, and a cutting blade formed in a spiral shape on the outer peripheral surface of the roller body,
The roller body has a cam shape in which a root portion of the cutting blade is raised,
The cutting blade has an angle formed between the surface of the band-like body at the time when the blade edge contacts the band-like body and the surface of the cutting blade on the rotation direction side of the roller cutter in the transport direction of the band-like body. It is formed to be 45 ° or more and less than 90 ° on the opposite side,
A cutting device that cuts the belt-like body with the roller cutter and the receiver.

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