JP6944639B2 - Guillotine type cutting machine - Google Patents

Description

The present invention relates to a guillotine type cutting machine.

Japanese Unexamined Patent Publication No. 2006-007404 proposes a slitter device for cutting a sheet-shaped electrode. Here, a slitter device such as a so-called shear method or a gang method is proposed. Here, the shear method is a method in which a thin round blade having a cutting edge angle of 85 to 90 ° and a thickness of less than 1 mm is used as the upper blade. The gang method is a method in which a round blade having a cutting edge angle of 90 ° and a thickness thicker than that of the shear type upper blade is used as the upper blade. Further, Japanese Patent Application Laid-Open No. 2012-024921 relates to a shearing machine for thick-walled steel sheets, and a so-called guillotine type shearing machine is proposed.

Japanese Unexamined Patent Publication No. 2006-007404 Japanese Unexamined Patent Publication No. 2012-024921

By the way, the present inventor considers using a guillotine type cutting machine adopting a guillotine method for cutting an electrode sheet used for a lithium ion secondary battery or the like.
A thin metal foil having a thickness of about 10 μm to 15 μm is used for the electrode sheet used for a lithium ion secondary battery or the like, and layers of active material particles are formed on both sides thereof. In some cases, a resin separator is further laminated on the layer of the active material particles. In particular, in the case where a resin separator is further laminated on the layer of the active material particles, the edge of the separator protrudes from the layer of the active material particles in order to completely cover the layer of the active material particles with the separator. May be present. As described above, the electrode sheets are laminated with materials having different hardness as described above. In particular, when cutting an electrode sheet in which a resin separator is laminated on a layer of active material particles and the edge of the separator protrudes from the layer of active material particles, it is between the blades of a guillotine type cutting machine. In addition, the separator may bite and may not be cut well.

The guillotine type cutting machine proposed here includes a fixed blade having a blade at one end, a moving blade having a blade at one end, and a moving mechanism. The moving mechanism has a holding portion for holding the moving blade, and is a mechanism for directing the moving blade to the fixed blade and moving the moving blade closer to or further from the fixed blade. .. Here, the blade of the moving blade has a serrated blade portion that protrudes from the other blade portions in the blade width direction in a part in the blade width direction.
According to this guillotine type cutting machine, a sheet material such as an electrode sheet is smoothly cut.

FIG. 1 is a front view of the guillotine type cutting machine 10 proposed here. FIG. 2 is a cross-sectional view taken along the line II-II. FIG. 3 is a cross-sectional view of an electrode sheet cut by the guillotine type cutting machine 10. FIG. 4 is a vertical sectional side view of the moving blade and the fixed blade of the guillotine type cutting machine 10. FIG. 5 is an enlarged front view of the serrated blade portion 22a1 provided on the moving blade 22 of the guillotine type cutting machine 10.

Hereinafter, an embodiment of the guillotine type cutting machine proposed here will be described. The embodiments described herein are, of course, not intended to specifically limit the present invention. The present invention is not limited to the embodiments described herein, unless otherwise specified.

FIG. 1 is a front view of the guillotine type cutting machine 10 proposed here. FIG. 2 is a cross-sectional view taken along the line II-II. FIG. 2 shows a state in which the electrode sheet 12 to be cut by the guillotine type cutting machine 10 is placed. FIG. 3 is a cross-sectional view of an electrode sheet cut by the guillotine type cutting machine 10. The directions of up, down, left, right, front, and back in the figure are represented by arrows U, D, L, R, F, and Rr in the figure, respectively.

Here, the electrode sheet 12 to be cut is a so-called separator-integrated electrode sheet as shown in FIGS. 1 to 3. The electrode sheet 12 has a current collecting foil 12a, an electrode active material layer 12b, and a separator 12c. The current collector foil 12a is a long and thin metal foil. The electrode active material layer 12b is formed on both sides of the current collector foil 12a, respectively. The separator 12c is a resin-made porous sheet, and is laminated on the electrode active material layer 12b. The separator 12c completely covers the surface of the electrode active material layer 12b, and the separator 12c protrudes from the electrode active material layer 12b at the widthwise edge of the electrode sheet 12. The electrode sheet 12 is cut along the width direction by a predetermined length.

In the electrode sheet 12 shown in FIGS. 1 and 2, there is a portion where the electrode active material layer 12b is not formed along one edge of the current collector foil 12a in the width direction. At the opposite edge in the width direction, electrode active material layers 12b are formed on both sides of the current collecting foil 12a, and a separator 12c is further attached to the surface of the electrode active material layer 12b. At the opposite edge in the width direction, the separator 12c protrudes from the electrode active material layer 12b. FIG. 3 shows a different form of the electrode sheet 12. In the electrode sheet 12 shown in FIG. 3, a portion where the electrode active material layer 12b is not formed is formed along the edges on both sides of the current collecting foil 12a in the width direction. A separator 12c is attached to the surface of the electrode active material layer 12b. The electrode sheet 12 to be cut has various forms.

For example, in the negative electrode sheet for a lithium ion secondary battery, a copper foil is used for the current collector foil 12a. The electrode active material layer 12b contains graphite particles as active material particles, carboxymethyl cellulose (CMC) as a binder, styrene-butadiene rubber (SBR), and the like. A polyethylene porous membrane (20 μm thickness) is used for the separator 12c. The separator 12c is attached to the electrode active material layer 12b, for example, by applying polytetrafluoroethylene (PTFE) to the surface thereof to impart adhesion and applying pressure by a press. In this embodiment, the thickness of the current collector foil 12a is 10 μm. The thickness of one side of the electrode active material layer 12b is about 60 μm. The thickness of one side of the separator 12c is about 20 μm.

As shown in FIG. 1, the guillotine type cutting machine 10 includes a fixed blade 21, a moving blade 22, and a moving mechanism 23. In this embodiment, the fixed blade 21, the moving blade 22, and the moving mechanism 23 are provided in the housing 30.

The housing 30 is a member having an open lower portion, pillars 31 and 32 on both sides, and a ceiling 33. Guides 31a and 32a for guiding the moving blade 22 are provided on the opposite side surfaces of the pillars 31 and 32 on both sides. In this embodiment, the guides 31a and 32a are formed with grooves along the longitudinal direction of the pillars 31 and 32 on both sides. The pillars 31 and 32 on both sides are provided with mounting portions 31b and 32b for mounting the fixed blade 21. A moving mechanism 23 is attached to the ceiling 33.

The fixed blade 21 is a member provided with a blade at one end. Here, FIG. 4 is a vertical sectional side view of the moving blade and the fixed blade of the guillotine type cutting machine 10. In this embodiment, the fixed blade 21 is a member having a horizontally long rectangular cross section as shown in FIG. The blade 21a of the fixed blade 21 is provided on one edge of the upper portion of the fixed blade 21 along the longitudinal direction. The angle of the cutting edge of the blade 21a of the fixed blade 21 is 90 ° in the illustrated example, but may be, for example, an angle of about 80 °. As shown in FIG. 1, the fixed blade 21 is attached to the lower part of the housing 30 with the blade 21a facing upward. As described above, it is preferable that the cutting edge of the blade 21a of the fixed blade 21 has an appropriate angle.

The moving blade 22 is a member provided with a blade at one end. In this embodiment, the moving blade 22 is a member having a horizontally long substantially rectangular cross section. The blade 22a of the moving blade 22 is provided on one edge of the lower portion of the moving blade 22 along the longitudinal direction. A shear angle α is attached to the blade 22a of the moving blade 22. In this embodiment, as shown in FIG. 1, the left side of the moving blade 22 is in a low position, and the right side is gradually raised. The shear angle α in the blade width direction is 2 °. It hits the electrode sheet 12 first and cuts from the left side to the right side. The angle β of the cutting edge shown in FIG. 2 is 80 °. As described above, it is preferable that the cutting edge of the blade 22a of the moving blade 22 has an appropriate angle. In this embodiment, high-speed steel (SKH) is used for the fixed blade 21 and the moving blade 22, respectively.

The blade 22a of the moving blade 22 has a serrated blade portion 22a1 in a part in the blade width direction. It protrudes more than the other blade portions 22a2 in the blade width direction. In this embodiment, the serrated blade portion 22a1 is provided at the left end portion that first contacts the electrode sheet 12. FIG. 5 is an enlarged front view of the serrated blade portion 22a1 provided on the moving blade 22 of the guillotine type cutting machine 10. The serrated blade portion 22a1 is provided with a continuous chevron blade (knurled blade). The other blade portion 22a2 of the moving blade 22 does not have such a chevron blade. In the other blade portion 22a2 of the moving blade 22, a blade is formed at the edge along the shear angle α. The tip of the chevron blade of the serrated blade portion 22a1 protrudes more than the other blade portions 22a2 in the blade width direction.

In this embodiment, as shown in FIG. 2, the fixed blade 21 and the moving blade 22 are slightly displaced back and forth at positions where the member to be cut is sandwiched, and a clearance C1 is provided. The clearance C1 may be set according to the sheet to be cut. In this embodiment, the clearance C1 is set to approximately 10 μm. The clearance C1 is appropriately determined in consideration of the sheet material to be cut, the cutting edge of the fixed blade 21 and the moving blade 22 and the like.

The moving mechanism 23 has a holding portion 23a for holding the moving blade 22. The moving mechanism 23 is a mechanism that directs the blade 22a of the moving blade 22 with respect to the blade 21a of the fixed blade 21 and brings the blade 22a of the moving blade 22 closer to or further from the blade 21a of the fixed blade 21. In this embodiment, the moving mechanism 23 is a piston cylinder mechanism attached to the ceiling 33 of the housing 30. The cylinder 23b is attached to the lower part of the ceiling 33. The piston 23c projects downward from the lower end of the cylinder 23b. The moving blade 22 is held by a holding portion 23a provided at the lower end of the piston 23c with the blade 22a facing downward.

In this embodiment, the electrode sheet 12 is a long member and is supplied between the fixed blade 21 and the moving blade 22 as shown in FIGS. 1 and 2. Then, it is cut in the width direction for each predetermined length. At this time, the chevron blade of the serrated blade portion 22a1 bites into the electrode sheet 12 and holds the electrode sheet 12. Then, in a state where the chevron blade of the serrated blade portion 22a1 bites into the electrode sheet 12, the electrode sheet is sandwiched between the moving blade 22 and the fixed blade 21 and cut. At this time, since the chevron blade of the serrated blade portion 22a1 bites into the electrode sheet 12, the electrode sheet 12 is difficult to enter into the clearance between the other blade portions 22a2 of the moving blade 22 and the blade 22a of the fixed blade 21, and the electrode. The sheet 12 is cut smoothly.

In this embodiment, the electrode sheet 12 has a portion along the edge on one side of the current collecting foil 12a in the width direction in which the electrode active material layer 12b is not formed. At the opposite edge in the width direction, electrode active material layers 12b are formed on both sides of the current collecting foil 12a, and a separator 12c is further attached to the surface of the electrode active material layer 12b. At the opposite edge in the width direction, the separator 12c protrudes from the electrode active material layer 12b. In this case, the position where the separator 12c protrudes from the electrode active material layer 12b may be aligned with the boundary between the serrated blade portion 22a1 of the moving blade 22 and the other blade portion 22a2. Then, the position of the electrode sheet 12 may be adjusted with respect to the moving blade 22 so that the separator 12c is cut from the electrode active material layer 12b by the serrated blade portion 22a1. Therefore, it is preferable that the transport device for transporting the electrode sheet 12 to the guillotine type cutting machine 10 is provided with an edge adjusting mechanism 50 (see FIG. 2) for positioning the electrode sheet 12. Various edge adjusting mechanisms 50 for the electrode sheet 12 have been proposed, and those having an appropriate function may be appropriately adopted.

As described above, the blade 22a of the moving blade 22 of the guillotine type cutting machine 10 has a serrated blade portion 22a1 protruding from the other blade portions 22a2 in the blade width direction in a part in the blade width direction. The serrated blade portion 22a1 corresponds to a sheet material to be cut prior to the other blade portions 22a2. A chevron-shaped blade is continuously provided on the serrated blade portion 22a1 and bites into the sheet material to be cut. Therefore, the sheet material to be cut is held by the serrated blade portion 22a1. After that, the sheet material is sandwiched between the other blade portion 22a2 and the blade 21a of the fixed blade 21. Since a part of the sheet material is held by the serrated blade portion 22a1, it is difficult for the sheet material to bite between the moving blade 22 and the fixed blade 21, and the sheet material is cut smoothly.

The present inventor has tested even when the moving blade 22 does not have the serrated blade portion 22a1, but the separator 12c protruding from the electrode active material layer 12b flows into the clearance C1 between the moving blade 22 and the fixed blade 21 and cuts. There were some defects. On the other hand, when the moving blade 22 is provided with the serrated blade portion 22a1, the separator 12c protruding from the electrode active material layer 12b does not easily flow into the clearance C1 between the moving blade 22 and the fixed blade 21 and cuts. Defects are greatly reduced.

Here, the protruding amount H1 (see FIG. 5) of the serrated blade portion 22a1 may be adjusted to an appropriate amount with respect to the sheet material to be cut. For example, as described above, when the electrode active material layer 12b is formed on both sides of the current collector foil 12a and the separator 12c is further attached to the surface of the electrode active material layer 12b, the serrated blade portion 22a1 The amount of protrusion of the electrode active material layer 12b is preferably larger than the thickness of the electrode active material layer 12b × 2 + the thickness of the current collector foil. Here, the amount of protrusion of the serrated blade portion 22a1 is the amount of the chevron blade of the serrated blade portion 22a1 protruding from the tip of the other blade portion 22a2 at the boundary between the serrated blade portion 22a1 and the other blade portion 22a2. Is. For example, when the thickness of the electrode active material layer 12b is 60 μm and the thickness of the current collector foil is 10 μm, the protruding amount of the serrated blade portion 22a1 is preferably about 130 μm. In this case, as shown in FIG. 5, the tip of the serrated blade portion 22a1 hits the separator 12c, and the serrated blade portion 22a1 presses the separator 12c protruding from the electrode active material layer 12b. Then, the electrode sheet 12 is cut by being sandwiched between the other blade portion 22a2 and the cutting edge of the fixed blade 21. Here, the width H2 (see FIG. 5) of the chevron blade of the serrated blade portion 22a1 is preferably about 1 mm, for example.

According to the knowledge of the present inventor, in the blade width of the moving blade 22, the serrated blade portion 22a1 is preferably longer than the length at which the separator 12c protrudes from the electrode active material layer 12b. As a result, at the portion where the separator 12c protrudes from the electrode active material layer 12b by the serrated blade portion 22a1, the serrated blade portion 22a1 hits the separator 12c in advance of the others, and the separator 12c is more reliably held by the serrated blade portion 22a1. NS.

Here, an example is illustrated in which a resin separator 12c is laminated on the electrode active material layer 12b, and the electrode sheet 12 whose edge of the separator 12c protrudes from the electrode active material layer 12b is cut. The sheet material cut by the guillotine type cutting machine 10 is not limited to such a form. In the guillotine type cutting machine 10, the serrated blade portion 22a1 hits the sheet material in advance, and while holding the sheet material, the other blade portions 22a2 cut the sheet material. Therefore, it can be widely applied to applications such as cutting an electrode sheet in which materials having different hardness are laminated.

Further, the guillotine type cutting machine 10 proposed here can be used for cutting not only electrode sheets but also various sheets. For example, it can be used in a form in which electrode active material layers 12b are formed on both sides of the current collecting foil 12a, or for cutting a separator which is a soft sheet. As the moving blade 22, it is preferable to use a moving blade 22 having an appropriate protrusion amount of the serrated blade portion 22a1 so that the sheet material to be cut can be cut smoothly. Further, the position where the serrated blade portion 22a1 is provided on the blade 22a of the moving blade 22 can be appropriately changed depending on the sheet material to be cut. In this guillotine type cutting machine 10, the serrated blade portion 22a1 hits the sheet material in advance, and while holding the sheet material, the other blade portions 22a2 cut the sheet material. In order to perform such a function, it is preferable to determine the position where the serrated blade portion 22a1 is provided with respect to the moving blade 22 according to the sheet material to be cut. That is, the position where the serrated blade portion 22a1 is provided does not necessarily have to be one end of the moving blade 22.

The various guillotine-type cutting machines proposed here have been described above. Unless otherwise specified, the embodiments of the guillotine type cutting machine mentioned here do not limit the present invention.

10 Guillotine type cutting machine 12 Electrode sheet 12a Current collecting foil 12b Electrode active material layer 12c Separator 21 Fixed blade 21a Blade 22 Moving blade 22a Blade 22a1 Jagged blade 22a2 Other blade 23 Moving mechanism 23a Holding 23b Cylinder 23c Piston 30 Body 31, 32 Pillar 31a, 32a Guide 31b, 32b Mounting part 33 Ceiling 50 Edge adjustment mechanism C1 Clearance α Shear angle

Claims (3)

A guillotine-type cutting machine that cuts sheet materials.
A fixed blade with a blade at one end and
A moving blade with a blade at one end,
A moving mechanism having a holding portion for holding the moving blade, with the moving blade facing the blade of the fixed blade, and moving the blade of the moving blade closer to or further from the blade of the fixed blade. With and
The blade of the moving blade has a knurled blade portion at one end in the blade width direction of the moving blade that cuts the sheet material, and the knurled blade portion is provided with a continuous chevron blade. The tip of the chevron blade protrudes more than the other part of the moving blade except the serrated blade portion.
A guillotine type cutting machine configured such that the serrated blade portion of the moving blade hits the sheet material ahead of other blade portions. The guillotine type according to claim 1, wherein the moving blade is a blade in which a blade portion other than the serrated blade portion has a shear angle gradually increasing from the side where the serrated blade portion is provided. Cutting machine. The claim that the blade of the moving blade and the blade of the fixed blade are blades along a straight line, respectively, and a clearance along the straight line is provided between the blade of the moving blade and the blade of the fixed blade. The guillotine type cutting machine according to 1 or 2.

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