JP7031522B2 - Cutting device - Google Patents

Description

The present invention relates to a cutting device.

Patent Document 1 discloses the following cutting device. Specifically, the metal sheet is provided with an annular first rotary blade arranged on the front surface side of the metal sheet and rotating, and an annular second rotary blade arranged and rotating on the back surface side of the metal sheet. , A cutting device that cuts a metal sheet so as to be sandwiched between a rotating first rotary blade and a rotating second rotary blade. In this cutting device, an annular first rubber member that rotates together with the first rotary blade is provided at a position adjacent to the first rotary blade. Further, an annular second rubber member is provided at a position adjacent to the second rotary blade and facing the first rubber member. The first rubber member has a form in which two types of rubber having different hardness are laminated in the radial direction, and the outer layer rubber constituting the outer peripheral surface is harder than the inner layer rubber located inside in the radial direction.

Japanese Unexamined Patent Publication No. 2002-239831

By the way, by a cutting device having a first rotary blade and a second rotary blade, a current collector foil having a first surface and a second surface and a first electrode mixture layer laminated on the first surface of the current collector foil. On the surface of the first separator laminated on the surface of the first electrode mixture layer, the second electrode mixture layer laminated on the second surface of the current collector foil, and the second electrode mixture layer. The electrode sheet having the laminated second separator and the second separator may be cut. Specifically, an annular first rotary blade that is arranged on the first separator side with respect to the electrode sheet and rotates around the axis of the first rotation axis, and an annular first rotary blade that is arranged on the second separator side with respect to the electrode sheet. Then, using a cutting device provided with an annular second rotary blade that rotates around the axis of the second rotary axis arranged in parallel with the first rotary axis, the electrode sheet is attached to the axis of the first rotary axis. The electrode sheet is cut so as to be sandwiched between the first rotary blade rotating around the shaft and the second rotary blade rotating around the axis of the second rotary shaft.

When the electrode sheet was cut as described above, the portion of the first electrode mixture layer and the second electrode mixture layer close to the cutting position may be peeled off from the current collector foil. Specifically, when the electrode sheet is cut, the first separator is pushed into the inside of the electrode sheet by the cutting edge of the first rotary blade, and the second separator is pushed into the electrode sheet by the cutting edge of the second rotary blade. It transforms so that it is pushed inside. As a result, the first separator and the second separator are deformed so as to be stretched, and the portion of the first electrode mixture layer close to the cutting position and the portion of the second electrode mixture layer close to the cutting position are formed. It sometimes swelled away from the current collector foil (floating from the current collector foil). As a result, the portion of the first electrode mixture layer and the second electrode mixture layer close to the cutting position may be peeled off (fall off) from the current collector foil.

The present invention has been made in view of the present situation, and the portion of the first electrode mixture layer and the second electrode mixture layer close to the cutting position is peeled off (falls off) from the current collecting foil (first). It is an object of the present invention to provide a cutting device capable of reducing the amount of peeling of the 1-electrode mixture layer and the 2nd electrode mixture layer).

One aspect of the present invention is a current collector foil having a first surface and a second surface, a first electrode mixture layer laminated on the first surface of the current collector foil, and the first electrode mixture layer. The first separator laminated on the surface of the collector foil, the second electrode mixture layer laminated on the second surface of the current collector foil, and the second electrode mixture layer laminated on the surface of the second electrode mixture layer. A cutting device that cuts an electrode sheet having a separator at a cutting position , wherein the cutting device is arranged on the first separator side with respect to the electrode sheet and around the axis of the first rotation axis. A rotating annular first rotary blade and a circle that is arranged on the second separator side with respect to the electrode sheet and rotates around the axis of the second rotary axis that is arranged parallel to the first rotary axis. An annular second rotary blade is provided, and the position where the first rotary blade and the second rotary blade do not overlap each other in a direction orthogonal to the axis of the first rotary axis and the axis of the second rotary axis. The electrode sheet is sandwiched between the first rotary blade that rotates around the axis of the first rotary shaft and the second rotary blade that rotates around the axis of the second rotary shaft. , The first rotary blade is configured to cut the electrode sheet, and the first rotary blade is a circle located on the second rotary blade side in the axial direction of the first rotary shaft and orthogonal to the first rotary shaft. The second rotary blade has a first inner surface forming an annular plane and a first outer surface forming a tapered surface that shrinks in diameter as it moves away from the first inner side surface in the axial direction. The second inner side surface, which is located on the first rotary blade side of the rotation axis and forms an annular plane orthogonal to the second rotation axis, and the second inner side surface are shrunk as they move away from the second inner side surface in the axial direction. The cutting device has a second outer surface forming a tapered surface having a diameter, and the cutting device further includes an annular first rubber member covering the first outer surface of the first rotary blade and the first rotation. An annular second rubber member that covers the first inner side surface of the blade, and an annular third rubber member that is provided adjacent to the second rubber member in the axial direction of the first rotation shaft. An annular fourth rubber member that covers the second outer surface of the second rotary blade, an annular fifth rubber member that covers the second inner surface of the second rotary blade, and the first. An annular sixth rubber member provided adjacent to the fifth rubber member in the axial direction of the second rotation shaft is provided, and the first rubber member, the second rubber member, and the third rubber are provided. The members are equal to or more than the outer diameter of the first rotary blade in a natural state. It has an outer diameter and is fixed in the axial position with respect to the first rotary axis together with the first rotary blade so as to rotate around the axis of the first rotary shaft together with the first rotary blade. The fourth rubber member, the fifth rubber member, and the sixth rubber member have an outer diameter equal to or more than the outer diameter of the second rotary blade and equal to each other in a natural state, and the first one. The position in the axial direction with respect to the second rotary shaft is fixed together with the two rotary blades, and the rubber is configured to rotate around the axis of the second rotary shaft together with the second rotary blade. The member, the fifth rubber member, and the sixth rubber member are arranged so as to face each other with the electrode sheet interposed therebetween, and the fourth rubber member, the second rubber member, and the third rubber member are arranged. Are arranged so as to face each other with the electrode sheet sandwiched between them, and when the electrode sheet is cut, the electrode sheet is located on the first outer surface side of the first rotary blade with respect to the first inner side surface. A portion including a portion close to the cutting position is sandwiched between the first rubber member, the fifth rubber member, and the sixth rubber member and pressed inward in the thickness direction, and the electrode sheet is pressed inward. Among the parts, the portion including the portion located closer to the cutting position on the second outer surface side of the second inner side surface of the second rotary blade, the fourth rubber member, the second rubber member, and the said. By sandwiching it between the third rubber member and pressing it inward in the thickness direction, the portion of the first electrode mixture layer close to the cutting position is pressed toward the current collecting foil side, and the above-mentioned The electrode sheet is cut while the portion of the second electrode mixture layer close to the cutting position is pressed toward the current collecting foil side, and the elastic coefficient E1 of the first rubber member and the second rubber member The elastic ratio E2, the elastic ratio E3 of the third rubber member, the elastic ratio E4 of the fourth rubber member, the elastic ratio E5 of the fifth rubber member, and the elastic ratio E6 of the sixth rubber member are E1 = E2 =. It is a cutting device that satisfies the relationship of E4 = E5 <E3 = E6.

The above-mentioned cutting device is on the surface of the current collector foil having the first surface and the second surface, the first electrode mixture layer laminated on the first surface of the current collector foil, and the first electrode mixture layer. An electrode sheet having a laminated first separator, a second electrode mixture layer laminated on the second surface of the current collector foil, and a second separator laminated on the surface of the second electrode mixture layer. It is a cutting device that cuts. The first electrode mixture layer and the second electrode mixture layer are, for example, electrode mixture layers containing an electrode active material and a binder, and are adhered to the current collector foil by the binder.

This cutting device is arranged on the first separator side (first surface side of the current collecting foil) with respect to the electrode sheet, and has an annular first rotary blade that rotates around the axis of the first rotation axis and an electrode. Of the axis of the second rotation axis arranged on the second separator side (the second surface side of the current collector foil, that is, the side opposite to the first rotation blade) with respect to the sheet and arranged in parallel with the first rotation axis. It is equipped with an annular second rotary blade that rotates around it. The first rotary blade and the second rotary blade are arranged at positions that do not overlap each other in a direction orthogonal to the axis of the first rotary axis and the axis of the second rotary axis. For example, the first rotary blade and the second rotary blade are arranged apart from each other (with a small gap) in the axial directions of the first rotary shaft and the second rotary shaft.

This cutting device cuts the electrode sheet by sandwiching the electrode sheet between the first rotary blade rotating around the axis of the first rotary axis and the second rotary blade rotating around the axis of the second rotary axis. .. Specifically, the cutting edge located on the outer peripheral portion of the first rotary blade and the cutting edge located on the outer peripheral portion of the second rotary blade are at a position intermediate between the first rotary shaft and the second rotary shaft, and the first rotary shaft. And, with the electrode sheet overlapping in the axial direction of the second rotation axis, the electrode sheet is rotated around the axis of the first rotation axis (blade edge) and the axis of the second rotation axis. The electrode sheet is cut so as to be sandwiched by the second rotary blade (blade edge).

The first rotary blade is located on the side of the second rotary blade in the axial direction of the first rotary axis and forms an annular plane orthogonal to the first rotary axis. It has a first outer surface that forms a tapered surface that shrinks in diameter as it moves away from the two rotary blades). Further, the second rotary blade has a second inner side surface which is located on the first rotary blade side in the axial direction of the second rotary axis and forms an annular plane orthogonal to the second rotary axis, and an axial direction from the second inner side surface. It has a second outer surface that forms a tapered surface that shrinks in diameter as it moves away from the first rotary blade.

Further, the above-mentioned cutting device covers the annular first rubber member that covers the first outer surface (tapered surface) of the first rotary blade and the first inner side surface of the first rotary blade (first inner surface). An annular second rubber member (arranged adjacent to the axial direction with respect to the axis) and an annular third rubber member provided adjacent to the second rubber member in the axial direction of the first rotation axis. To prepare for. Therefore, the first rubber member, the second rubber member, and the third rubber member are arranged in this order in the axial direction of the first rotation axis.

The first rubber member, the second rubber member, and the third rubber member naturally have an outer diameter equal to or higher than the outer diameter of the first rotary blade and equal to each other. Further, the positions of the first rubber member, the second rubber member, and the third rubber member in the axial direction with respect to the first rotary blade are fixed together with the first rotary blade, and the positions around the axis of the first rotary shaft together with the first rotary blade are fixed. It is configured to rotate to.

The natural state of the first rubber member is a state in which no external force is applied to the first rubber member. Specifically, in the above-mentioned cutting device, the first rubber is applied to the electrode sheet to be cut. A state in which the members are not pressure-welded (specifically, a state in which the members are not elastically compressed and deformed by pressure-welding). The same applies to the natural states of the second rubber member, the third rubber member, the fourth rubber member, the fifth rubber member, and the sixth rubber member.

Therefore, in the above-mentioned cutting device, when the first rubber member and the second rubber member are in a natural state, the cutting edge of the first rotary blade is radially outward from the outer peripheral surfaces of the first rubber member and the second rubber member. Not protruding. Therefore, when the cutting edge of the first rotary blade is brought into the inside of the electrode sheet in order to cut the electrode sheet, the first rubber member and the second rubber member are in pressure contact with the electrode sheet and elastic inward in the radial direction. It becomes a state of being compressed and deformed. In other words, the first rubber member and the second rubber member are pressed against the electrode sheet and elastically compressed and deformed inward in the radial direction, so that the cutting edge of the first rotary blade becomes the first rubber member and the second rubber. The electrode sheet is cut in a state of protruding outward in the radial direction from the outer peripheral surface of the member.

Further, the above-mentioned cutting device covers the annular fourth rubber member that covers the second outer surface (tapered surface) of the second rotary blade and the second inner side surface of the second rotary blade (second inner surface). An annular fifth rubber member (arranged adjacent to the axial direction with respect to the fifth rubber member) and an annular sixth rubber member provided adjacent to the fifth rubber member in the axial direction of the second rotation axis. To prepare for. Therefore, the 4th rubber member, the 5th rubber member, and the 6th rubber member are arranged in this order in the axial direction of the second rotation axis.

The fourth rubber member, the fifth rubber member, and the sixth rubber member naturally have an outer diameter equal to or higher than the outer diameter of the second rotary blade and equal to each other. Further, the positions of the 4th rubber member, the 5th rubber member, and the 6th rubber member in the axial direction with respect to the 2nd rotation axis are fixed together with the 2nd rotary blade, and around the axis of the 2nd rotation axis together with the 2nd rotary blade. It is configured to rotate to.

Therefore, in the above-mentioned cutting device, when the 4th rubber member and the 5th rubber member are in a natural state, the cutting edge of the 2nd rotary blade is radially outward from the outer peripheral surfaces of the 4th rubber member and the 5th rubber member. Not protruding. Therefore, when the cutting edge of the second rotary blade is brought into the inside of the electrode sheet in order to cut the electrode sheet, the fourth rubber member and the fifth rubber member are in pressure contact with the electrode sheet and elastic inward in the radial direction. It becomes a state of being compressed and deformed. In other words, the 4th rubber member and the 5th rubber member are pressed against the electrode sheet and elastically compressed and deformed inward in the radial direction, so that the cutting edge of the 2nd rotary blade becomes the 4th rubber member and the 5th rubber. The electrode sheet is cut in a state of protruding outward in the radial direction from the outer peripheral surface of the member.

Further, in the above-mentioned cutting device, when the electrode sheet is cut, the first rubber member, the fifth rubber member, and the sixth rubber member are arranged so as to face each other with the electrode sheet interposed therebetween. That is, when the electrode sheet is cut, the fifth rubber member and the sixth rubber member face the first rubber member in the thickness direction (lamination direction) of the electrode sheet. Further, when the electrode sheet is cut, the fourth rubber member, the second rubber member, and the third rubber member are arranged so as to face each other with the electrode sheet interposed therebetween. That is, when the electrode sheet is cut, the second rubber member and the third rubber member face the fourth rubber member in the thickness direction (stacking direction) of the electrode sheet.

Therefore, in the above-mentioned cutting device, when the electrode sheet is cut (when the cutting edge of the first rotary blade and the cutting edge of the second rotary blade try to enter the electrode sheet), the first rotary blade of the electrode sheet is the first. A portion located on the first outer surface (tapered surface) side of the inner side surface of 1 is sandwiched between the first rubber member and the fifth and sixth rubber members and pressed inward in the thickness direction (collecting foil side). The parts of the electrode sheet located on the second outer surface (tapered surface) side of the second inner surface of the second rotary blade are the fourth rubber member and the second and third rubber members. It is sandwiched between the two and pressed inward in the thickness direction (collecting foil side).

Therefore, in the above-mentioned cutting device, the electrodes are pressed in a state where the first separator and the first electrode mixture layer are pressed toward the current collector foil side and the second separator and the second electrode mixture layer are also pressed toward the current collector foil side. The sheet (the portion where the first separator, the first electrode mixture layer, the current collector foil, the second electrode mixture layer, and the second separator are laminated) can be cut. As a result, when the electrode sheet is cut, the portion of the first electrode mixture layer and the second electrode mixture layer that is close to the cutting position rises in the direction away from the current collector foil (floats from the current collector foil). It can be suppressed. Therefore, according to the above-mentioned cutting device, the portion of the first electrode mixture layer and the second electrode mixture layer that is close to the cutting position is peeled off (falls off) from the current collector foil (the first electrode mixture layer and the second electrode mixture layer). The amount of peeling of the second electrode mixture layer) can be reduced.

Further, in the above-mentioned cutting device, the elastic modulus E1 of the first rubber member, the elastic modulus E2 of the second rubber member, the elastic modulus E3 of the third rubber member, the elastic modulus E4 of the fourth rubber member, and the elastic modulus of the fifth rubber member. The modulus E5 and the elastic modulus E6 of the sixth rubber member satisfy the relationship of E1 = E2 = E4 = E5 <E3 = E6. That is, the first rubber member, the second rubber member, the fourth rubber member, and the fifth rubber member have the same hardness, and the third rubber member and the sixth rubber member have the same hardness and the first rubber member. Harder than 1 rubber member and 4th rubber member.

Therefore, in order to cut the electrode sheet, when the cutting edge of the first rotary blade is made to enter the inside of the electrode sheet and the cutting edge of the second rotary blade is made to enter the inside of the electrode sheet, it is more elastic than the fourth rubber member. The third rubber member having a high rate has a smaller amount of deformation (amount of compression inward in the radial direction) than a portion of the fourth rubber member that faces the third rubber member across the electrode sheet. Therefore, in the fourth rubber member, the portion facing the third rubber member is significantly compressed and deformed inward in the radial direction as compared with the portion facing the second rubber member (the elastic modulus is equivalent to that of the fourth rubber member). become.

Further, at this time, the sixth rubber member having a higher elastic modulus than the first rubber member is deformed (inward in the radial direction) from the portion of the first rubber member facing the sixth rubber member across the electrode sheet. The amount of compression) becomes smaller. Therefore, in the first rubber member, the portion facing the sixth rubber member is significantly compressed and deformed inward in the radial direction as compared with the portion facing the fifth rubber member (the elastic modulus is equivalent to that of the first rubber member). become.

Therefore, in the electrode sheet, the portion sandwiched between the third rubber member and the fourth rubber member (with respect to the portion sandwiched between the second rubber member and the fourth rubber member, the axial direction is the first. The portion of the 1-rotary blade adjacent to the side away from the cutting edge) moves in the direction away from the cutting edge of the 1st rotary blade and the 2nd rotary blade (the direction closer to the 2nd rotary axis), thereby moving to the 2nd rotary blade side. The cut portion of the electrode sheet located at is also moved away from the cutting edges of the first rotary blade and the second rotary blade immediately after the cut portion is formed (immediately after being sandwiched between the first rotary blade and the second rotary blade). Can be moved in the direction.

Further, in the electrode sheet, the portion sandwiched between the 6th rubber member and the 1st rubber member (with respect to the portion sandwiched between the 5th rubber member and the 1st rubber member, the second in the axial direction. The portion of the 2-rotary blade adjacent to the side away from the cutting edge) moves in the direction away from the cutting edge of the 1st rotary blade and the 2nd rotary blade (the direction closer to the 1st rotary axis), thereby moving to the 1st rotary blade side. The cut portion of the electrode sheet located at is also moved away from the cutting edges of the first rotary blade and the second rotary blade immediately after the cut portion is formed (immediately after being sandwiched between the first rotary blade and the second rotary blade). Can be moved in the direction.

In this way, by moving the cut portion of the electrode sheet away from the cutting edges of the first rotary blade and the second rotary blade immediately after the cut portion is formed, the electrode material located at the cut portion (first electrode combination). It is possible to prevent the first rotary blade and the second rotary blade from coming into contact with the material forming the material layer and the second electrode mixture layer, specifically, the electrode active material and the like). This makes it possible to reduce damage to the electrode material such as the electrode active material and further peeling of the first electrode mixture layer and the second electrode mixture layer.

It is an enlarged view of the plan view part of an electrode sheet. FIG. 3 is a cross-sectional view taken along the line EE of FIG. It is a figure explaining the cutting method of an electrode sheet. It is another figure explaining the cutting method of the electrode sheet. It is a front view sectional view of the cutting apparatus which concerns on embodiment. It is a side view schematic diagram of the cutting device. It is a figure which shows the cutting device at the time of cutting an electrode sheet. It is the F part enlarged view of FIG. It is a figure explaining the amount of peeling of the 1st electrode mixture layer and the 2nd electrode mixture layer.

(Embodiment)
First, before explaining the cutting device 10 according to the present embodiment, the electrode sheet 100 cut by the cutting device 10 will be described. As shown in FIG. 1, the electrode sheet 100 is a strip-shaped member extending in the length direction DA. As shown in FIG. 2, the electrode sheet 100 has a current collector foil 101 having a first surface 101b and a second surface 101c, and a first electrode mixture layer laminated on the first surface 101b of the current collector foil 101. 102, a first separator 103 laminated on the surface 102c of the first electrode mixture layer 102, a second electrode mixture layer 104 laminated on the second surface 101c of the current collector foil 101, and a second electrode. It has a second separator 105 laminated on the surface 104c of the mixture layer 104.

In this embodiment, a copper foil having a thickness of 10 μm is used as the current collector foil 101. Further, the first electrode mixture layer 102 and the second electrode mixture layer 104 are equivalent electrode mixture layers. In the present embodiment, the first electrode mixture layer 102 and the second electrode mixture layer 104 contain an electrode active material (for example, graphite particles) and a binder (for example, SBR and CMC), respectively. The first electrode mixture layer 102 and the second electrode mixture layer 104 are adhered to the current collector foil 101 by a binder. In the present embodiment, the thickness of the first electrode mixture layer 102 and the second electrode mixture layer 104 (dimensions related to DC in the thickness direction) is 120 μm, respectively.

In this embodiment, as shown in FIG. 2, the width of the first electrode mixture layer 102 and the second electrode mixture layer 104 (dimensions related to the width direction DB) is smaller than the width of the current collector foil 101. is doing. Specifically, in the first electrode mixture layer 102 and the second electrode mixture layer 104, one end of the width direction DB (right end in FIG. 2) is one end of the width direction DB of the current collector foil 101 (FIG. 2). It is provided so as to be located inside (on the left side in FIG. 2) in the width direction DB with respect to the right end).

The first separator 103 and the second separator 105 are equivalent separators and are made of a resin film having electrical insulating properties. In this embodiment, a polyethylene porous film having a thickness of 20 μm is used as the first separator 103 and the second separator 105.

In this embodiment, as shown in FIG. 2, the width of the first separator 103 and the second separator 105 (dimensions related to the width direction DB) is set to the first electrode mixture layer 102 and the second electrode mixture layer 104. It is larger than the width of. Specifically, in the first separator 103 and the second separator 105, both ends of the width direction DB thereof are from both ends of the width direction DB of the first electrode mixture layer 102 and the second electrode mixture layer 104 to the width direction DB. It is provided so as to protrude. The first separator 103 and the second separator 105 are adhered to the first electrode mixture layer 102 and the second electrode mixture layer 104 via an adhesive (specifically, an acrylic binder) (not shown). ..

Next, a method of cutting the electrode sheet 100 according to the embodiment will be described. In the present embodiment, the electrode sheet 100 is cut in the width direction DB by the cutting device 10 described later. Specifically, as shown in FIGS. 3 and 4, a strip-shaped electrode sheet 100 extending in the length direction DA is cut at a cutting position C arranged at regular intervals in the length direction DA to form a strip (sheet). A plurality of electrode sheets 100 (leaf type) are produced.

Here, the cutting device 10 of the present embodiment will be described in detail. FIG. 5 is a front view sectional view of the cutting device 10. However, in FIG. 5, the distance between the first rotating shaft 11 and the second rotating shaft 15 is increased as compared with the state when the electrode sheet 100 is cut, not the state when the electrode sheet 100 is cut. It shows a state in which the first cutting unit 50 and the second cutting unit 60 are separated from each other. FIG. 6 is a schematic side view of the cutting device 10. Note that FIG. 6 shows a state when the electrode sheet 100 is cut. However, in FIG. 6, among the members constituting the cutting device 10, the first rotary shaft 11, the second rotary shaft 15, the first cutting member 24 having the first rotary blade 25, and the second rotary blade 35 are shown. Only the second cutting member 34 having is shown, and the other members are not shown. Further, FIG. 7 is a diagram showing a cutting device 10 when the electrode sheet 100 is being cut, and is a front view sectional view of the cutting device 10. FIG. 8 is an enlarged view of the F portion of FIG. 7.

As shown in FIG. 5, the cutting device 10 of the present embodiment is fixed to the first rotation shaft 11, the second rotation shaft 15 arranged in parallel with the first rotation shaft 11, and the first rotation shaft 11. It includes a first cutting member 24, a second cutting member 34 fixed to the second rotation shaft 15, and a rotation drive device 40 for rotating the first rotation shaft 11 and the second rotation shaft 15. Of these, the first cutting member 24 is made of a cemented carbide having an annular plate shape, and is provided with an annular first rotary blade 25 on the outer peripheral portion thereof. The second cutting member 34 is made of a cemented carbide having an annular plate shape, and is provided with an annular second rotary blade 35 on the outer peripheral portion thereof.

The first rotation axis 11 has a cylindrical shape extending in the first axis direction DX1 (the direction in which the first axis line AX1, which is the axis of the first rotation axis 11, extends, the left-right direction in FIG. 5). The first rotation shaft 11 is driven by the rotation drive device 40 to rotate around the first axis line AX1 in the first rotation direction DR1 (clockwise in FIG. 6).

Further, the second rotation axis 15 has a cylindrical shape extending in the second axis direction DX2 (the direction in which the second axis AX2, which is the axis of the second rotation axis 15, extends, the left-right direction in FIG. 5). The second rotation axis is driven by the rotation drive device 40 to rotate around the second axis AX2 in the second rotation direction DR2 (counterclockwise in FIG. 6).

The first rotation shaft 11 and the second rotation shaft 15 rotate so that the rotation directions are opposite to each other, as shown by arrows in FIG. That is, the first rotation direction DR1 is a rotation direction opposite to the second rotation direction DR2. As a result, the first rotary blade 25 and the second rotary blade 35 rotate so that their rotation directions are opposite to each other.

When the electrode sheet 100 is cut, the first rotary blade 25 is arranged on the first separator 103 side (the first surface 101b side of the current collector foil 101, the upper side in FIG. 6) with respect to the electrode sheet 100, and the first rotary blade 25 is arranged. It rotates around the first axis AX1 of the rotating shaft 11. On the other hand, the second rotary blade 35 is arranged on the second separator 105 side (the second surface 101c side of the current collector foil 101, the lower side in FIG. 6) with respect to the electrode sheet 100, and is the second rotation shaft 15. Rotate around the 2-axis line AX2.

The positions of the first rotary blade 25 and the second rotary blade 35 do not overlap each other in the directions orthogonal to the first axis AX1 and the second axis AX2 (vertical direction and axis orthogonal direction DE in FIGS. 5 and 7). Is located in. Specifically, the first rotary blade 25 and the second rotary blade 35 are separated from each other in the first axial direction DX1 and the second axial direction DX2 (left-right direction in FIGS. 5 and 7) (with a small gap). ) Have been placed.

The cutting device 10 has a first rotary blade 25 and a second rotary shaft that rotate the electrode sheet 100 around the first axis AX1 of the first rotary shaft 11 at a cutting position C (cut line) extending in the width direction DB. The electrode sheet 100 is cut so as to be sandwiched by the second rotary blade 35 that rotates around the second axis AX2 of 15. Specifically, the cutting edge 25d located on the outer peripheral portion of the first rotary blade 25 and the cutting edge 35d located on the outer peripheral portion of the second rotary blade 35 are positioned between the first rotary shaft 11 and the second rotary shaft 15. Then, the electrode sheet 100 is rotated around the first axis AX1 of the first rotation axis 11 in a state where the electrode sheet 100 is overlapped with the first axis direction DX1 and the second axis direction DX2 (horizontal direction in FIGS. 7 and 8). The electrode sheet 100 is cut so as to be sandwiched between the first rotary blade 25 (blade tip 25d) and the second rotary blade 35 (blade tip 35d) that rotates around the second axis AX2 of the second rotary shaft 15.

In the present embodiment, the cutting device 10 (see FIG. 6) with the first axis direction DX1 and the second axis direction DX2 aligned with the length direction of the electrode sheet 100 (see FIG. 7). While moving the first cutting unit 50 and the second cutting unit 60), which will be described later, in the moving direction DM (to the right in FIG. 6) along the width direction DB of the electrode sheet 100, the electrode sheet 100 is moved to the first rotation axis 11 It is cut so as to be sandwiched between the first rotary blade 25 that rotates around the second rotary blade 25 and the second rotary blade 35 that rotates around the second rotary shaft 15. Further, in the present embodiment, the electrode sheet 100 is cut with the lap amount of the first rotary blade 25 and the second rotary blade 35 (the radial dimension in which they overlap) is set to 0.5 mm (while maintaining 0.5 mm). do.

The first rotary blade 25 has an annular plane located on the second rotary blade 35 side (right side in FIGS. 5 and 7) with respect to the first axis direction DX1 and orthogonal to the first rotary axis 11 (first axis line AX1). The first inner side surface 25b to form a tapered surface that shrinks in diameter as it moves away from the first inner side surface 25b toward DX1 in the first axis direction (the side away from the second rotary blade 35, the left side in FIGS. 5 and 7). It has an outer side surface 25c. Further, the second rotary blade 35 is located on the first rotary blade 25 side (left side in FIGS. 5 and 7) in the second axis direction DX2 and is an annular shape orthogonal to the second rotary axis 15 (second axis AX2). It forms a flat second inner side surface 35b and a tapered surface that shrinks in diameter as it moves away from the second inner side surface 35b in the second axis direction DX2 (the side away from the first rotary blade 25, the right side in FIGS. 5 and 7). It has a second outer surface 35c.

Further, the cutting device 10 of the present embodiment includes an annular first rubber member 21 that covers the first outer surface 25c (tapered surface) of the first rotary blade 25, and a first inner side surface 25b of the first rotary blade 25. An annular second rubber member 22 (arranged adjacent to the first axial direction DX1 with respect to the first inner side surface 25b) and an annular second rubber member 22 adjacent to the first axial direction DX1 with respect to the second rubber member 22. A third rubber member 23 having an annular shape is provided. Therefore, the first rubber member 21, the second rubber member 22, and the third rubber member 23 are arranged in this order in the first axial direction DX1 (left-right direction in FIGS. 5 and 7).

The first rubber member 21, the second rubber member 22, and the third rubber member 23 naturally have an outer diameter equal to or greater than the outer diameter of the first rotary blade 25 and equal to each other. In the present embodiment, the first rubber member 21, the second rubber member 22, and the third rubber member 23 have an outer diameter slightly larger than the outer diameter of the first rotary blade 25 in a natural state. (See Fig. 5).

Further, in the first rubber member 21, the second rubber member 22, and the third rubber member 23, the position of the first rotary blade 25 is fixed together with the first rotary blade 25 in the direction DX1 in the first axial direction with respect to the first rotary shaft 11. It is configured to rotate around the first axis AX1 of the first rotation axis 11. In the present embodiment, the first cutting member 24 having the first rotary blade 25, the first rubber member 21, the second rubber member 22, and the third rubber member 23 are a pair of fixing members 26, 27 having an annular plate shape. The position of the first axis direction DX1 with respect to the first rotation axis 11 is fixed while being sandwiched between the first axis direction DX1. The fixing members 26 and 27 are fixed to the first rotating shaft 11 with the first rotating shaft 11 inserted in the through holes 26b and 27b (see FIG. 5). In the cutting device 10 of the present embodiment, the first cutting member 24 having the first rotary shaft 11 and the first rotary blade 25, the first rubber member 21, the second rubber member 22, the third rubber member 23, and the fixing member 26, The first cutting unit 50 is configured by 27.

Here, the natural state of the first rubber member 21 is a state in which no external force is applied to the first rubber member 21, and specifically, in the cutting device 10, the electrode sheet 100 to be cut is subjected to. A state in which the first rubber member 21 is not pressure-welded (specifically, a state in which compression deformation is not elastically performed by pressure-welding, a state shown in FIG. 5). The same applies to the natural states of the second rubber member 22, the third rubber member 23, the fourth rubber member 31, the fifth rubber member 32, and the sixth rubber member 33, which will be described later.

Therefore, in the cutting device 10 of the present embodiment, when the first rubber member 21 and the second rubber member 22 are in a natural state, as shown in FIG. 5, the cutting edge 25d of the first rotary blade 25 is the first rubber. It does not project radially outward from the outer peripheral surface 21b of the member 21 material and the outer peripheral surface 22b of the second rubber member 22. Therefore, when the cutting edge 25d of the first rotary blade 25 is brought into the inside of the electrode sheet 100 in order to cut the electrode sheet 100, the first rubber member 21 and the second rubber member 22 are pressed against the electrode sheet 100. Then, it is elastically compressed and deformed inward in the radial direction (see FIG. 7). In other words, the first rubber member 21 and the second rubber member 22 are pressed against the electrode sheet 100 and elastically compressed and deformed inward in the radial direction, so that the cutting edge 25d of the first rotary blade 25 becomes the first rubber. The outer peripheral surface 21b of the member 21 material and the outer peripheral surface 22b of the second rubber member 22 are in a state of protruding outward in the radial direction, and the electrode sheet 100 is cut in this state.

Further, the cutting device 10 of the present embodiment includes an annular fourth rubber member 31 that covers the second outer surface 35c (tapered surface) of the second rotary blade 35, and a second inner side surface 35b of the second rotary blade 35. An annular fifth rubber member 32 (arranged adjacent to the second axial direction DX2 with respect to the second inner side surface 35b) and adjacent to the second axial direction DX2 with respect to the fifth rubber member 32. A sixth rubber member 33 having an annular shape is provided. Therefore, the 4th rubber member 31, the 5th rubber member 32, and the 6th rubber member 33 are arranged in this order in the second axis direction DX2 of the second rotation shaft 15.

The fourth rubber member 31, the fifth rubber member 32, and the sixth rubber member 33 naturally have an outer diameter equal to or greater than the outer diameter of the second rotary blade 35 and equal to each other. In the present embodiment, the fourth rubber member 31, the fifth rubber member 32, and the sixth rubber member 33 have an outer diameter slightly larger than the outer diameter of the second rotary blade 35 in a natural state. (See Fig. 5).

Further, the fourth rubber member 31, the fifth rubber member 32, and the sixth rubber member 33 are fixed together with the second rotary blade 35 in the position of DX2 in the second axis direction with respect to the second rotary shaft 15, so that the second rotary blade 35 It is configured to rotate around the second axis AX2 of the second rotation axis 15. In the present embodiment, the second cutting member 34 having the second rotary blade 35, the fourth rubber member 31, the fifth rubber member 32, and the sixth rubber member 33 are a pair of fixing members 36, 37 having an annular plate shape. The position of the second axis direction DX2 with respect to the second rotation axis 15 is fixed in a state of being sandwiched between the second axis direction DX2. The fixing members 36 and 37 are fixed to the second rotating shaft 15 with the second rotating shaft 15 inserted in the through holes 36b and 37b (see FIG. 5). In the cutting device 10 of the present embodiment, the second cutting member 34 having the second rotary shaft 15 and the second rotary blade 35, the fourth rubber member 31, the fifth rubber member 32, the sixth rubber member 33, and the fixing member 36, The second cutting unit 60 is configured by the 37.

Therefore, in the cutting device 10 of the present embodiment, when the fourth rubber member 31 and the fifth rubber member 32 are in a natural state, the cutting edge 35d of the second rotary blade 35 is the outer peripheral surface 31b of the fourth rubber member 31 and It does not project radially outward from the outer peripheral surface 32b of the fifth rubber member 32 (see FIG. 5). Therefore, when the cutting edge 25d of the second rotary blade 35 is brought into the inside of the electrode sheet 100 in order to cut the electrode sheet 100, the fourth rubber member 31 and the fifth rubber member 32 are pressed against the electrode sheet 100. Then, it is elastically compressed and deformed inward in the radial direction (see FIG. 7). In other words, the 4th rubber member 31 and the 5th rubber member 32 are in pressure contact with the electrode sheet 100 and elastically compressed and deformed inward in the radial direction, so that the cutting edge 35d of the 2nd rotary blade 35 becomes the 4th rubber. The outer peripheral surface 31b of the member 31 and the outer peripheral surface 32b of the fifth rubber member 32 are in a state of protruding radially outward, and the electrode sheet 100 is cut in this state.

Further, in the cutting device 10 of the present embodiment, when the electrode sheet 100 is cut, the first rubber member 21, the fifth rubber member 32, and the sixth rubber member 33 face each other with the electrode sheet 100 interposed therebetween. (See FIG. 7). That is, when the electrode sheet 100 is cut, the fifth rubber member 32 and the sixth rubber member 33 form the first rubber with respect to the thickness direction DC of the electrode sheet 100 (corresponding to the vertical direction and the axis orthogonal direction DE in FIG. 7). It faces the member 21. Further, when the electrode sheet 100 is cut, the fourth rubber member 31, the second rubber member 22, and the third rubber member 23 are arranged so as to face each other with the electrode sheet 100 interposed therebetween. That is, when the electrode sheet 100 is cut, the second rubber member 22 and the third rubber member 23 are in the fourth rubber member in the thickness direction of the electrode sheet 100 (corresponding to the vertical direction and the axis orthogonal direction DE in FIG. 7). It faces 31.

Therefore, in the cutting device 10 of the present embodiment, when the electrode sheet 100 is cut (when the cutting edge 25d of the first rotary blade 25 and the cutting edge 35d of the second rotary blade 35 try to enter the electrode sheet 100), the electrode is used. The portions of the sheet 100 located on the first outer surface 25c side (left side in FIGS. 7 and 8) of the first inner side surface 25b of the first rotary blade 25 are the first rubber member 21 and the fifth and sixth rubbers. It is sandwiched between the members 32 and 33 and pressed toward the inside of the DC in the thickness direction (on the side of the current collecting foil 101), and at the same time, from the second inner side surface 35b of the second rotary blade 35 of the electrode sheet 100. The portion located on the second outer surface 35c side (right side in FIGS. 7 and 8) is sandwiched between the fourth rubber member 31 and the second and third rubber members 22, 23, and is located in the thickness direction DC. It is in a state of being pressed inward (on the side of the current collecting foil 101).

Therefore, in the cutting device 10 of the present embodiment, the first separator 103 and the first electrode mixture layer 102 are pressed toward the collector foil 101 side (lower side in FIGS. 7 and 8), and the second separator 105 and the second separator 105 and the second separator 105 are pressed. With the two-electrode mixture layer 104 pressed toward the collector foil 101 side (upper side in FIGS. 7 and 8), the electrode sheet 100 (first separator 103, first electrode mixture layer 102, current collector foil 101, first The two-electrode mixture layer 104 and the portion where the second separator 105 is laminated) can be cut.

As a result, when the electrode sheet 100 is cut, the portion of the first electrode mixture layer 102 that is close to the cutting position C (referred to as the cutting proximity portion 102b) and the second electrode mixture layer 104 that is at the cutting position C. It is possible to prevent the adjacent portion (referred to as the cut proximity portion 104b) from rising (lifting from the current collector foil 101) so as to be separated from the current collector foil 101 (see FIG. 8). Therefore, according to the cutting apparatus 10 of the present embodiment, the cutting proximity portion 102b of the first electrode mixture layer 102 and the cutting proximity portion 104b of the second electrode mixture layer 104 are peeled off (dropped off) from the current collector foil 101. ) (Amount of peeling of the first electrode mixture layer 102 and the second electrode mixture layer 104) can be reduced.

Further, in the cutting device 10 of the present embodiment, the elastic modulus E1 of the first rubber member 21, the elastic modulus E2 of the second rubber member 22, the elastic modulus E3 of the third rubber member 23, and the elastic modulus E4 of the fourth rubber member 31 And the elastic modulus E5 of the fifth rubber member 32 and the elastic modulus E6 of the sixth rubber member 33 satisfy the relationship of E1 = E2 = E4 = E5 <E3 = E6. That is, the first rubber member 21, the second rubber member 22, the fourth rubber member 31, and the fifth rubber member 32 have the same hardness, and the third rubber member 23 and the sixth rubber member 33 have the same hardness. And is harder than the first rubber member 21 and the fourth rubber member 31.

In this embodiment, the material of the first rubber member 21, the second rubber member 22, the fourth rubber member 31, and the fifth rubber member 32 is silicone rubber having a hardness of Hs50. Further, the material of the third rubber member 23 and the sixth rubber member 33 is silicone rubber having a hardness of Hs80. Therefore, the magnitude relation of the elastic modulus of the present embodiment is as follows: (elastic modulus of the first rotary blade 25 and the second rotary blade)> (elastic modulus of the electrode sheet 100)> (third rubber member 23 and sixth rubber member 33). Elastic modulus)> (elastic modulus of the first rubber member 21, the second rubber member 22, the fourth rubber member 31, and the fifth rubber member 32).

Therefore, in order to cut the electrode sheet 100, when the cutting edge 25d of the first rotary blade 25 is made to enter the inside of the electrode sheet 100 and the cutting edge 35d of the second rotary blade 35 is made to enter the inside of the electrode sheet 100, the first The third rubber member 23, which has a higher elastic modulus than the four rubber members 31, faces the third rubber member 23 in the axial direction DE (vertical direction in FIG. 8) with the electrode sheet 100 sandwiched between the fourth rubber members 31. The amount of deformation (amount of compression inward in the radial direction) is smaller than that of the portion 31c. Therefore, in the fourth rubber member 31, the portion 31c facing the third rubber member 23 is radially inside as compared with the portion 31d facing the second rubber member 22 (the elastic modulus is equivalent to that of the fourth rubber member 31). It will be greatly compressed and deformed (lower side in FIG. 8).

Further, at this time, the sixth rubber member 33 having a higher elastic modulus than the first rubber member 21 is placed in the axial direction DE (vertical direction in FIG. 8) with the electrode sheet 100 sandwiched between the first rubber members 21. 6 The amount of deformation (amount of compression inward in the radial direction) is smaller than that of the portion 21c facing the rubber member 33. Therefore, in the first rubber member 21, the portion 21c facing the sixth rubber member 33 is radially inside as compared with the portion 21d facing the fifth rubber member 32 (the elastic modulus is equivalent to that of the first rubber member 21). It will be greatly compressed and deformed (upper side in FIG. 8).

Therefore, in the electrode sheet 100, the portion 100c sandwiched between the third rubber member 23 and the fourth rubber member 31 (the portion 100d sandwiched between the second rubber member 22 and the fourth rubber member 31). On the other hand, in the first axial direction DX1, the direction (the portion adjacent to the side of the first rotary blade 25 away from the cutting edge 25d) is away from the cutting edge 25d of the first rotary blade 25 and the cutting edge 35d of the second rotary blade 35 (second). The cut portion 100b1 of the electrode sheet 100 located on the side of the second rotary blade 35 is also moved immediately after the cut portion 100b1 is formed (first rotation) by moving in the direction closer to the rotation shaft 15 (downward in FIG. 8). Immediately after being sandwiched between the blade 25 and the second rotary blade 35), it can be moved in a direction away from the blade edge 25d of the first rotary blade 25 and the blade edge 35d of the second rotary blade 35 (to the right in FIG. 8). ..

Further, in the electrode sheet 100, a portion 100f sandwiched between the sixth rubber member 33 and the first rubber member 21 (a portion 100g sandwiched between the fifth rubber member 32 and the first rubber member 21). On the other hand, in the second axial direction DX2, the direction (the portion adjacent to the side of the second rotary blade 35 away from the cutting edge 35d) is away from the cutting edge 25d of the first rotary blade 25 and the cutting edge 35d of the second rotary blade 35 (first). The cut portion 100b2 of the electrode sheet 100 located on the side of the first rotary blade 25 is also moved immediately after the cut portion 100b2 is formed (first rotation) by moving in the direction approaching the rotation shaft 11 (upward in FIG. 8). Immediately after being sandwiched between the blade 25 and the second rotary blade 35), it can be moved in a direction away from the blade edge 25d of the first rotary blade 25 and the blade edge 35d of the second rotary blade 35 (to the left in FIG. 8). ..

In this way, the cutting portions 100b1, 100b2 of the electrode sheet 100 are moved away from the cutting edge 25d of the first rotary blade 25 and the cutting edge 35d of the second rotary blade 35 immediately after the cutting portions 100b1, 100b2 are formed. The first rotary blade 25 and the first rotary blade 25 and the first rotary blade 25 and the second It is possible to prevent the two rotary blades 35 from coming into contact with each other. As a result, damage to the electrode material such as the electrode active material and peeling of the first electrode mixture layer 102 and the second electrode mixture layer 104 can be reduced even in the cut portions 100b1 and 100b2 after cutting (immediately after cutting). Can be done.

(Cut test)
Next, a test for cutting the electrode sheet 100 was performed using the cutting device 10 of the embodiment. Specifically, the electrode sheet 100 was cut using the cutting device 10 at three cutting positions C of the electrode sheet 100 (cutting positions extending in the width direction DB of the electrode sheet 100, see FIG. 3). After that, the maximum value of the peeling amount (dropping amount) of the first electrode mixture layer 102 and the second electrode mixture layer 104 was measured at each of the three cutting positions C, and the average value was obtained.

The "maximum amount of peeling of the first electrode mixture layer 102 and the second electrode mixture layer 104" is defined as the cut proximity portion 102b of the first electrode mixture layer 102 (of the first electrode mixture layer 102). The portion of the second electrode mixture layer 104 that is close to the cut position C) and the cut proximity portion 104b of the second electrode mixture layer 104 (the portion of the second electrode mixture layer 104 that is close to the cut position C) that is peeled off from the current collector foil 101. , The maximum value of the dimension (referred to as the peeling dimension P) from the cutting position C (that is, the cut surface) of the electrode sheet 100 to the length direction DA (left-right direction in FIG. 9) of the electrode sheet 100 (see FIG. 9). ..

In this test, the maximum value of the amount of peeling of the first electrode mixture layer 102 and the second electrode mixture layer 104 is measured as follows. Specifically, first, after cutting the electrode sheet 100, the first separator 103 and the second separator 105 are peeled off from the cut electrode sheet 100. In this state, of the first surface 101b and the second surface 101c of the current collector foil 101, the cut proximity portion 102b of the first electrode mixture layer 102 and the cut proximity portion 104b of the second electrode mixture layer 104 are the current collector foils. The maximum value of the dimension (peeling dimension P) applied to the DA in the length direction was measured for the portion exposed by peeling from 101 (see FIG. 9). In this way, the maximum value of the peeling dimension P was measured for the three cutting positions C, and the average value of these was obtained.

Further, as a comparative embodiment, the first rubber member 21, the second rubber member 22, the third rubber member 23, the fourth rubber member 31, the fifth rubber member 32, and the sixth rubber are compared with the cutting device 10 of the embodiment. We prepared a cutting device that differs only in that it does not have the member 33. Using the cutting device of this comparative form, the cutting test as described above was performed, the maximum value of the peeling dimension P was measured at the three cutting positions C, and the average value thereof was obtained.

In the cutting device of the comparative form, the average value of the maximum values of the peeling dimensions P was 0.65 mm. On the other hand, in the cutting device 10 of the embodiment, the average value of the maximum value of the peeling dimension P is 0.05 mm or less, which is an extremely small value as compared with the comparative embodiment. From this result, according to the cutting apparatus 10 of the present embodiment, the cutting proximity portion 102b of the first electrode mixture layer 102 and the cutting proximity portion 104b of the second electrode mixture layer 104 are separated from the current collector foil 101. It can be said that it is possible to reduce (falling off) (the amount of peeling of the first electrode mixture layer 102 and the second electrode mixture layer 104).

Although the present invention has been described above in accordance with the embodiment, it is needless to say that the present invention is not limited to the above embodiment and can be appropriately modified and applied without departing from the gist thereof.

For example, in the embodiment, an example of cutting the electrode sheet 100 in the width direction DB thereof is shown. Specifically, a strip-shaped electrode sheet 100 extending in the length direction DA is cut at a cutting position C arranged at regular intervals in the length direction DA to produce a plurality of strip-shaped (single-leaf type) electrode sheets 100. (See FIGS. 3 and 4).

However, the cutting device of the present invention is not limited to the one that cuts the electrode sheet in this way, and for example, the electrode sheet 100 may be cut in the length direction DA. Specifically, the strip-shaped electrode sheet 100 extending in the length direction DA is cut at the cutting position extending in the length direction DA at the center position of the width direction DB to prepare two strip-shaped electrode sheets 100. You may do so. Even when cutting in this way, according to the cutting apparatus of the present invention, the cutting proximity portion 102b of the first electrode mixture layer 102 and the cutting proximity portion 104b of the second electrode mixture layer 104 are the current collecting foil 101. It can be said that the peeling from the first electrode mixture layer 102 and the second electrode mixture layer 104 can be reduced.

10 Cutting device 11 1st rotary shaft 15 2nd rotary shaft 21 1st rubber member 22 2nd rubber member 23 3rd rubber member 24 1st cutting member 25 1st rotary blade 25b 1st inner surface 25c 1st outer surface 31 4 Rubber member 32 5th rubber member 33 6th rubber member 34 2nd cutting member 35 2nd rotary blade 35b 2nd inner side surface 35c 2nd outer surface 100 Electrode sheet 101 Current collector foil 101b 1st surface 101c 2nd surface 102 1st 1 Electrode mixture layer 103 1st separator 104 2nd electrode mixture layer 105 2nd separator AX1 1st axis AX2 2nd axis C Cutting position DA Length direction DB Width direction DC Thickness direction DE Axis orthogonal direction DX1 1st axis direction DX2 2nd axis direction

Claims (1)

The current collector foil having the first surface and the second surface, the first electrode mixture layer laminated on the first surface of the current collector foil, and the first electrode mixture layer laminated on the surface of the first electrode mixture layer. An electrode sheet having a first separator, a second electrode mixture layer laminated on the second surface of the current collector foil, and a second separator laminated on the surface of the second electrode mixture layer. Is a cutting device that cuts at the cutting position .
The cutting device is
An annular first rotary blade arranged on the first separator side with respect to the electrode sheet and rotating around the axis of the first rotary axis.
An annular second rotary blade, which is arranged on the second separator side with respect to the electrode sheet and rotates around the axis of the second rotary axis arranged in parallel with the first rotary axis, is provided.
The first rotary blade and the second rotary blade are arranged at positions that do not overlap each other in a direction orthogonal to the axis of the first rotary axis and the axis of the second rotary axis.
The electrode sheet is sandwiched between the first rotary blade that rotates around the axis of the first rotary shaft and the second rotary blade that rotates around the axis of the second rotary shaft. Is configured to disconnect
The first rotary blade has a first inner side surface that is located on the second rotary blade side in the axial direction of the first rotary axis and forms an annular plane orthogonal to the first rotary axis, and the first inner surface. It has a first outer surface that forms a tapered surface that shrinks in diameter as it moves away from the side surface in the axial direction.
The second rotary blade has a second inner side surface that is located on the first rotary blade side in the axial direction of the second rotary axis and forms an annular plane orthogonal to the second rotary axis, and the second inner surface. It has a second outer surface that forms a tapered surface that shrinks in diameter as it moves away from the side surface in the axial direction.
The cutting device further
An annular first rubber member covering the first outer surface of the first rotary blade,
An annular second rubber member that covers the first inner side surface of the first rotary blade, and
An annular third rubber member provided adjacent to the second rubber member in the axial direction of the first rotation shaft, and a third rubber member.
An annular fourth rubber member covering the second outer surface of the second rotary blade,
An annular fifth rubber member covering the second inner side surface of the second rotary blade,
An annular sixth rubber member provided adjacent to the fifth rubber member in the axial direction of the second rotation shaft is provided.
The first rubber member, the second rubber member, and the third rubber member naturally have an outer diameter equal to or higher than the outer diameter of the first rotary blade and equal to each other, and together with the first rotary blade, the said. The position in the axial direction with respect to the first rotation axis is fixed, and it is configured to rotate around the axis of the first rotation axis together with the first rotary blade.
The fourth rubber member, the fifth rubber member, and the sixth rubber member have an outer diameter equal to or more than the outer diameter of the second rotary blade and equal to each other in a natural state, and together with the second rotary blade, the said. The position in the axial direction with respect to the second rotation axis is fixed, and it is configured to rotate around the axis of the second rotation axis together with the second rotation blade.
The first rubber member, the fifth rubber member, and the sixth rubber member are arranged so as to face each other with the electrode sheet interposed therebetween, and the fourth rubber member, the second rubber member, and the third rubber member are arranged so as to face each other. The rubber member is arranged so as to face each other with the electrode sheet interposed therebetween.
At the time of cutting the electrode sheet, the portion of the electrode sheet including a portion of the electrode sheet located closer to the cutting position on the first outer surface side of the first inner side surface of the first rotary blade is referred to as the first portion. It is sandwiched between the 1 rubber member and the 5th rubber member and the 6th rubber member and pressed inward in the thickness direction, and from the second inner side surface of the second rotary blade of the electrode sheet. Also, a portion including a portion located on the second outer surface side and close to the cutting position is sandwiched between the fourth rubber member, the second rubber member, and the third rubber member, and is inward in the thickness direction. By putting it in the pressed state, the portion of the first electrode mixture layer close to the cut position is pressed toward the current collecting foil side, and the portion of the second electrode mixture layer close to the cut position is close to the cut position. With the portion pressed toward the collecting foil side, the electrode sheet was cut.
The elastic modulus E1 of the first rubber member, the elastic modulus E2 of the second rubber member, the elastic modulus E3 of the third rubber member, the elastic modulus E4 of the fourth rubber member, and the elastic modulus E5 of the fifth rubber member. The elastic modulus E6 of the sixth rubber member is a cutting device that satisfies the relationship of E1 = E2 = E4 = E5 <E3 = E6.

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