JP2019075241A - Electrode sheet cutting device - Google Patents

Abstract

To provide an electrode sheet cutting device capable of deforming an uncoated portions (portions to be uncoated portions) of two sheets of electrodes in an uneven shape while producing two sheets of electrodes of a band shape extending in a lengthwise direction by cutting a band-shaped electrode sheet in the lengthwise direction.SOLUTION: An electrode sheet cutting device 10 is so configured that, when cutting a current collection foil 58 constituting an uncoated portion 56b at a cutting position C by sandwiching the uncoated portion 56b of an electrode sheet 56 moving in a lengthwise direction DA between a first blade 25 of a first cutting roll 20 and a second blade 35 of a second cutting roll 30, while an uneven surface 21d of a first uneven portion 21 is pressed to a first surface 58b of the other end side portion 58f of the current collector foil 58 constituting the uncoated portion 56b, an uneven surface 31d of a second uneven portion 31 is pressed against a second surface 58c of the one end side portion 58g of the current collector foil 58 that constitutes the uncoated portion 56b.SELECTED DRAWING: Figure 11

Description

  The present invention relates to an electrode sheet cutting device.

  Patent Document 1 discloses the following method of manufacturing a secondary battery. First, a terminal-attached lid member in which a lid portion of a battery case, a positive electrode terminal member, and a negative electrode terminal member are assembled and integrated is prepared. Further, an electrode assembly is prepared in which a strip-shaped negative electrode, a strip-shaped separator, a strip-shaped positive electrode, and a strip-shaped separator are wound into a flat shape. In this electrode body, of the positive electrode, a positive electrode mixture layer uncoated portion on which the positive electrode mixture layer is not coated on the first surface and the second surface of the positive electrode current collector foil; A negative electrode mixture layer uncoated portion on which the negative electrode mixture layer is not coated on the first surface and the second surface of the foil is disposed on the opposite side in the width direction.

JP, 2014-127282, A

  More specifically, in the electrode body, a plurality of rectangular metal foil portions which are a part of the positive electrode current collector foil are disposed at one end in the width direction of the electrode body in the lamination direction (thickness direction of the electrode body) A plurality of rectangular metal foil portions, which are a part of the negative electrode current collector foil, have a laminated metal foil laminated portion and at the other end in the width direction of the electrode body. Metal foil laminated portion laminated in the thickness direction).

  Subsequently, the plate-like negative electrode current collection terminal contained in a lid member with a terminal is joined to the metal foil laminated part of the negative electrode compound material layer uncoated part among electrode bodies by resistance welding. Specifically, the metal foil laminated portion and the negative electrode current collector terminal were laminated in the laminating direction (superposed) between the front end surface of the first electrode tip of the resistance welder and the front end surface of the second electrode tip. A load is applied across the laminate. In this state, a current of a fixed magnitude is passed between the first electrode tip and the second electrode tip for a fixed time. The resistance heat (Joule heat) generated by this energization melts the portion sandwiched between the first electrode tip and the second electrode tip in the laminate (the metal foil laminated portion and the negative electrode current collector terminal) And weld the metal foil laminated portion and the negative electrode current collector terminal.

  By the way, when the above-described resistance welding is performed, the welding current may be concentrated on a part of the chip opposing surface facing the tip surface of the first electrode tip in the metal foil laminated portion, and spatter may occur. . On the other hand, in patent document 1, the front end surface which contacts metal foil lamination | stacking part among 1st electrode chips is made into the uneven surface which has uneven | corrugated shape. As a result, concentration of the welding current on a part of the chip-facing surface of the metal foil laminated portion is suppressed, and generation of spatter is suppressed.

  However, in the method of Patent Document 1, with the use of a resistance welding machine (while increasing the number of times of resistance welding), the uneven surface (convex portion) which is the tip surface of the first electrode tip is worn or uneven surface A part of the molten metal foil intrudes into the concave part of the concave part, and the unevenness of the tip surface is reduced, which may make it impossible to suppress the occurrence of sputtering. On the other hand, the inventor of the present invention suppresses the occurrence of spattering at the time of resistance welding by making the uncoated portion constituting the metal foil laminated portion uneven as well, without making the tip surface of the electrode tip uneven. I thought I could.

  Therefore, the inventor of the present invention has a band-like current collector foil having a first surface and a second surface, and a band-like electrode mixture layer coated on the first surface and the second surface of the current collector foil. When the strip-like electrode sheet having the strip is cut in the length direction to produce two strip-like electrodes extending in the length direction, uncoated portions of the two sheets (uncoated at the same time as the cut) I thought about making uneven part the part which becomes a part. In this way, the manufacturing time can be shortened as compared with the case of providing the step (apparatus) of deforming the uncoated portion of the electrode mixture layer into the uneven shape separately from the step (apparatus) of cutting the electrode sheet. Manufacturing cost can also be reduced.

  The present invention has been made in view of the present situation, and by cutting a strip-shaped electrode sheet in the length direction, two strip-shaped electrodes extending in the length direction are produced. An object of the present invention is to provide an electrode sheet cutting device capable of deforming a non-coated portion (a portion to be a non-coated portion) of an electrode into a concavo-convex shape.

  One aspect of the present invention is a strip-shaped current collector foil having a first surface and a second surface, and a strip-shaped electrode mixture layer coated on the first surface and the second surface of the current collector foil. And a strip-shaped electrode sheet having the strip, cut in the longitudinal direction thereof to produce two strip-like electrodes extending in the longitudinal direction, the electrode sheet being the current collector Two coated portions in which the electrode mixture layer is coated on the first surface and the second surface of the foil, and in the form of a strip extending in the longitudinal direction, which is orthogonal to the longitudinal direction Two coated parts located apart from each other in the width direction, and an uncoated part where the electrode mixture layer is not coated on the first surface and the second surface of the current collector foil. A strip extending in the longitudinal direction, and an uncoated portion positioned between the two coated portions; It is a 1st cutting roll arrange | positioned with respect to the said current collection foil which comprises the said uncoated part at the said 1st surface side, Comprising: The 1st axial direction which the 1st axis line which is an axis of the said 1st cutting roll extends And the first cutting roll that rotates around the first axis with the width direction of the electrode sheet aligned, and the second surface side with respect to the current collector foil that constitutes the uncoated portion. A second cutting roll, wherein a second axial direction in which a second axis which is an axis of the second cutting roll extends is made to coincide with the width direction of the electrode sheet, and is rotated about the second axial A second cutting roll, the first cutting roll being positioned on one end side of the first cutting roll with respect to the first axial direction, and extending in the circumferential direction all around the outer peripheral surface of the first cutting roll An annular first blade portion; and the first axis relative to the first blade portion And a first uneven portion whose outer peripheral surface is an uneven surface, and the second cutting roll has the second axial direction. An annular second blade located on the other end side of the second cutting roll and extending in the circumferential direction all around the outer circumferential surface of the second cutting roll, and the second blade in the second axial direction with respect to the second blade The electrode sheet cutting apparatus according to the present invention is provided with a second uneven portion having a cylindrical second uneven portion adjacent to one end side, the outer peripheral surface of which is an uneven surface, and the electrode sheet cutting device moves in the length direction The first blade portion of the first cutting roll that rotates the uncoated portion around the first axis, and the second blade of the second cutting roll that rotates around the second axis. When the current collector foil constituting the uncoated part is cut at a cutting position by being sandwiched by the parts At the same time, on the first surface of the other end side portion of the current collector foil constituting the uncoated portion located on the other end side with respect to the cutting position in the width direction, the first concavo-convex portion The uneven surface is pressed while being rotated about the first axis, and at one end side portion of the current collector foil constituting the uncoated portion, which is located on one end side with respect to the cutting position in the width direction The concavo-convex surface of the second concavo-convex portion is configured to be pressed against the second surface while being rotated about the second axis, and in the electrode sheet moving in the length direction, The current collecting member constituting the uncoated part is sandwiched between the first blade rotating about the first axis and the second blade rotating about the second axis. Before cutting the uncoated part while cutting the foil at the cutting position The uneven surface of the first uneven portion rotating around the first axis is pressed against the first surface of the other end of the current collector foil, whereby the other end of the current collector foil To the second surface of the one end side portion of the current collector foil constituting the uncoated portion, and the second uneven surface of the second uneven portion rotates around the second axis. It is an electrode sheet cutting device which deform | transforms the said one end side site | part of the said current collection foil into uneven | corrugated shape by pressing.

  The above-mentioned electrode sheet cutting device comprises a strip-like current collector foil having a first surface and a second surface, and a strip-shaped electrode mixture layer coated on the first surface and the second surface of the current collector foil, A strip-shaped electrode sheet having the above is cut in the length direction thereof to produce two strip-shaped electrodes extending in the length direction of the electrode sheet. The electrode sheets to be cut are two coated parts in which the electrode mixture layer is coated on the first surface and the second surface of the current collector foil, and a strip extending in the length direction of the electrode sheet The electrode mixture layer is coated on the two coated portions positioned apart from each other in the width direction orthogonal to the length direction of the electrode sheet, and on the first and second surfaces of the current collector foil. There is no uncoated portion, a strip extending in the length direction of the electrode sheet, and an uncoated portion positioned between two coated portions in the width direction.

  Furthermore, the above-mentioned electrode sheet cutting device is the 1st cutting roll arranged on the 1st side to current collection foil which constitutes the uncoated part of an electrode sheet, and the axis of the 1st cutting roll concerned A direction in which a certain first axis extends (referred to as a first axial direction) is arranged to coincide with the width direction of the electrode sheet, and a first cutting roll that rotates about the first axis is provided. Furthermore, the above-mentioned electrode sheet cutting device is a second cutting roll disposed on the second surface side with respect to the current collector foil that constitutes the uncoated portion of the electrode sheet, and the axis line of the second cutting roll A second cutting roll is provided, which is disposed with the direction in which a second axis extends (referred to as the second axis) in the width direction of the electrode sheet, and which rotates about the second axis.

  Among them, the first cutting roll is positioned on one end side of the first cutting roll in the first axial direction, and has an annular first blade portion extending in the circumferential direction all around the outer peripheral surface of the first cutting roll It is a cylindrical 1st uneven part adjacent to the other end side of the 1st axial direction to this 1st blade part, and the 1st uneven part whose outer peripheral surface is an uneven surface is provided. The second cutting roll is located on the other end side of the second cutting roll in the second axial direction, and has an annular second blade that extends in the circumferential direction all around the outer circumferential surface of the second cutting roll. It is a cylindrical second concavo-convex part adjacent to one end side in the second axial direction with respect to the second blade part, and the outer circumferential surface thereof is provided with the second concavo-convex part as a concavo-convex surface.

  The electrode sheet cutting device includes: a first blade portion of a first cutting roll that rotates an uncoated portion of an electrode sheet moving (conveyed) in a length direction around a first axis; and a second axis (The first blade rotating around the first axis and the second blade rotating around the second axis sandwiching the width of the electrode sheet) with the second blade of the second cutting roll rotating around At the overlapping position in the direction), the current collector foil constituting the uncoated portion is configured to be cut at the cutting position.

  Furthermore, when the electrode sheet cutting device cuts the current collector foil constituting the uncoated portion at the cutting position as described above, the cutting position in the width direction of the current collector foil constituting the uncoated portion The current collecting foil constituting the uncoated portion, in which the concavo-convex surface of the first concavo-convex portion is pressed while rotating around the first axis on the first surface of the other end side portion positioned closer to the other end The uneven surface of the second uneven portion is configured to be pressed against the second surface of the one end side portion located at one end side of the cutting position in the width direction, while rotating around the second axis.

  Therefore, in the above-described electrode sheet cutting device, the first blade portion rotating about the first axis and the second blade rotating about the second axis among the uncoated portions of the electrode sheet moving in the length direction And cutting the current collector foil constituting the uncoated portion at the cutting position, with respect to the first surface of the other end side portion of the current collector foil constituting the uncoated portion, around the first axis. By pressing the uneven surface of the rotating first uneven portion, the other end side portion of the current collector foil constituting the uncoated portion is deformed into the uneven shape, and the current collector foil constituting the uncoated portion The uneven surface of the second uneven portion, which rotates around the second axis, is pressed against the second surface of the one end portion of the first portion to deform the first end portion of the current collector foil constituting the uncoated portion into an uneven shape I can do it.

  Here, one end side portion of the current collector foil constituting the uncoated portion of the electrode sheet is the uncoated portion of one of the two electrodes produced by cutting the strip-shaped electrode sheet, and Part of the Moreover, the other end side portion of the current collector foil constituting the uncoated portion of the electrode sheet is the uncoated portion of the other of the two electrodes produced by cutting the strip-shaped electrode sheet Part of the Therefore, according to the above-described electrode sheet cutting apparatus, by cutting the strip-shaped electrode sheet in the length direction, while preparing the strip-like two electrodes extending in the length direction, the uncoated two electrodes are produced. The machined portion (the portion to be an uncoated portion) can be deformed into a concavo-convex shape.

1 is a cross-sectional view of a secondary battery according to an embodiment. It is a perspective view of the electrode body of the secondary battery. It is a top view of the positive electrode which constitutes the electrode body. It is sectional drawing of the same positive electrode, and is equivalent to DD sectional drawing of FIG. It is a figure which shows the negative electrode which comprises the same electrode body. It is sectional drawing of the same negative electrode, and is equivalent to FF sectional drawing of FIG. It is a top view of the electrode sheet (negative electrode sheet) concerning an embodiment. It is sectional drawing of the electrode sheet, and is corresponded to the BB sectional drawing of FIG. It is the front view schematic of the electrode sheet cutting device concerning embodiment. It is the side view schematic of the electrode sheet cutting device. It is a figure explaining the cutting method of the electrode sheet by the electrode sheet cutting device. It is a figure explaining the preparation methods of an electrode body. It is a front view of a lid member with a terminal concerning an embodiment. It is a figure explaining resistance welding concerning an embodiment. It is a front view of an electrode body with a terminal concerning an embodiment.

First, before describing the electrode sheet cutting device 10 according to the present embodiment, a negative electrode 156 manufactured using the electrode sheet cutting device 10 and a secondary battery 100 manufactured using the negative electrode 156 will be described. .
As shown in FIG. 1, the secondary battery 100 is a rectangular sealed lithium ion secondary battery including a battery case 110 having a rectangular parallelepiped shape, a positive electrode external terminal 121, and a negative electrode external terminal 131. Among these, the battery case 110 is a hard case having a metal rectangular housing portion 111 and a metal lid portion 112 which form a rectangular parallelepiped housing space. The electrode body 150 and the like are accommodated in the battery case 110 (the rectangular accommodation portion 111).

  The electrode assembly 150 is a flat wound electrode assembly in which a strip-shaped positive electrode 155 and a strip-shaped negative electrode 156 are wound in a flat shape with the separator 157 interposed between the positive electrode 155 and the negative electrode 156 (see FIG. 2).

  As shown in FIGS. 3 and 4, the positive electrode 155 has a strip shape extending in the length direction DA, and is made of an aluminum foil, a positive electrode current collector foil 151, and both surfaces (a first surface 151b and a second surface) of the positive electrode current collector foil 151. And a positive electrode mixture layer 152 coated on part of the surface 151c). The positive electrode mixture layer 152 contains a positive electrode active material 153, a conductive material (for example, acetylene black), and a binder.

  A portion of the positive electrode 155 to which the positive electrode mixture layer 152 is applied is referred to as a positive electrode mixture layer coated portion 155 c. On the other hand, a portion where the positive electrode mixture layer 152 is not coated (that is, a portion consisting of only the positive electrode current collector foil 151) is referred to as a positive electrode mixture layer uncoated portion 155b. The positive electrode mixture layer uncoated portion 155 b is positioned at an end (left end in FIG. 3) of the positive electrode current collector foil 151 (positive electrode 155) in the width direction DB (left and right direction in FIG. It extends in a strip shape in the length direction DA of the positive electrode current collector foil 151 (positive electrode 155) along one long side of the (positive electrode 155).

  The positive electrode mixture layer uncoated portion 155 b is wound in a flat shape at one end (the right end in FIGS. 1 and 2) of the width direction DB of the electrode body 150. The positive electrode mixture layer uncoated portion 155b is constituted by a plurality of rectangular metal foil portions 155b1, a plurality of arc-shaped upper arc portions 155b2, and a plurality of arc-shaped lower arc portions 155b3. (See Figure 2). The plurality of rectangular metal foil portions 155 b 1 are arranged in the thickness direction (stacking direction DC) of the electrode body 150 to constitute a metal foil laminated portion 155 d. Accordingly, in the electrode body 150, a rectangular metal foil portion 155b1 which is a part of the positive electrode current collector foil 151 is provided at one end (right end in FIGS. 1 and 2) of the width direction DB of the electrode 150. A plurality of metal foil laminated portions 155 d laminated in the lamination direction DC (the thickness direction of the electrode body 150) are provided.

  Further, as shown in FIGS. 5 and 6, the negative electrode 156 (electrode) is a strip-like negative electrode current collector foil 158 made of copper foil extending in the length direction DA, and both surfaces of the negative electrode current collector foil 158 (first surface And the negative electrode mixture layers 159 and 159 applied to a part of the second surface 158c). The negative electrode mixture layer 159 contains a negative electrode active material 154, a binder (for example, SBR), and a thickener (for example, CMC).

  A portion of the negative electrode 156 to which the negative electrode mixture layer 159 is applied is referred to as a negative electrode mixture layer coated portion 156 c. On the other hand, a portion of the negative electrode 156 on which the negative electrode mixture layer 159 is not coated (that is, a portion consisting of only the negative electrode current collector foil 158) is referred to as a negative electrode mixture layer uncoated portion 156b. In the negative electrode mixture layer uncoated portion 156b, along the one long side of the negative electrode current collector foil 158 (negative electrode 156), in the length direction DA (vertical direction in FIG. 5) of the negative electrode current collector foil 158 (negative electrode 156). It extends in a band. In the present embodiment, the surface (the first surface 158 b and the second surface 158 c) of the negative electrode composite material layer uncoated portion 156 b is an uneven surface having an uneven shape.

  The negative electrode composite material layer uncoated portion 156b is wound in a flat shape at the other end (the left end in FIGS. 1 and 2) of the electrode body 150 in the width direction DB. The negative electrode mixture layer uncoated portion 156b is constituted by a plurality of rectangular metal foil portions 156b1, a plurality of arc-shaped upper arc portions 156b2, and a plurality of arc-shaped lower arc portions 156b3. (See Figure 2). The plurality of rectangular metal foil portions 156b1 are arranged in the thickness direction (stacking direction DC) of the electrode body 150 to constitute a metal foil laminated portion 156d. Therefore, in the electrode body 150, a rectangular metal foil portion 156b1 which is a part of the negative electrode current collector foil 158 is provided at the other end (left end in FIGS. 1 and 2) of the electrode body 150 in the width direction DB. A plurality of metal foil laminated portions 156 d laminated in the lamination direction DC (the thickness direction of the electrode body 150) are provided.

  Further, a plate-like positive electrode current collector terminal 122 made of aluminum is joined to the metal foil laminated portion 155 d of the positive electrode mixture material layer uncoated portion 155 b by ultrasonic welding. Thus, the positive electrode mixture layer uncoated portion 155b (positive electrode 155) is electrically connected to the positive electrode external terminal 121 through the positive electrode current collector terminal 122 (see FIG. 1).

  In addition, a plate-like negative electrode current collector terminal 132 made of copper is joined to the metal foil laminated portion 156d of the negative electrode composite material layer uncoated portion 156b by resistance welding. Thus, the negative electrode mixture layer uncoated portion 156b (negative electrode 156) is electrically connected to the negative electrode external terminal 131 through the negative electrode current collector terminal 132 (see FIG. 1).

  In the present embodiment, the positive electrode external terminal 121 and the positive electrode current collecting terminal 122 are integrally formed to constitute the positive electrode terminal member 120. Further, the negative electrode external terminal 131 and the negative electrode current collector terminal 132 are integrally formed to constitute the negative electrode terminal member 130.

  The separator 157 is a separator made of a resin film having electrical insulation. The separator 157 is interposed between the positive electrode 155 and the negative electrode 156 to separate them. The separator 157 is impregnated with a non-aqueous electrolytic solution 140 having lithium ions.

Next, an electrode sheet cutting device 10 according to the present embodiment, a method of manufacturing the negative electrode 156 using the electrode sheet cutting device 10, and a method of manufacturing the secondary battery 100 will be described.
First, the negative electrode sheet 56 (electrode sheet) is prepared. As shown in FIGS. 7 and 8, the negative electrode sheet 56 has a strip-like current collector foil 58 having a first surface 58 b and a second surface 58 c, and the first surface 58 b and the second surface 58 c of the current collector foil 58. And a strip-like negative electrode mixture layer 59, 59 (electrode mixture layer) coated thereon.

  The negative electrode sheet 56 has two coated portions 56 c and 56 c in which the negative electrode mixture layers 59 and 59 are coated on the first surface 58 b and the second surface 58 c of the current collector foil 58. The two coated portions 56c, 56c form a strip extending in the length direction DA (vertical direction in FIG. 7) of the negative electrode sheet 56, and have a width direction DB perpendicular to the length direction DA of the negative electrode sheet 56 (in FIG. In the left-right direction). Further, the negative electrode sheet 56 has an uncoated portion 56 b in which the negative electrode mixture layers 59, 59 are not coated on the first surface 58 b and the second surface 58 c of the current collector foil 58. The uncoated portion 56b has a strip shape extending in the length direction DA of the negative electrode sheet 56, and is located between the two coated portions 56c and 56c in the width direction DB of the negative electrode sheet 56.

Next, the negative electrode sheet 56 is cut in the length direction DA using the electrode sheet cutting device 10, and two strip-shaped negative electrodes 156 extending in the length direction DA are manufactured.
Here, the electrode sheet cutting device 10 of the present embodiment will be described in detail. FIG. 9 is a schematic front view of the electrode sheet cutting device 10. FIG. 10 is a schematic side view of the electrode sheet cutting device 10. In FIG. 10, the conveying direction (moving direction) of the negative electrode sheet 56 when the negative electrode sheet 56 is cut by the electrode sheet cutting device 10 is indicated by an arrow as the conveying direction DM.

  As shown in FIGS. 9 and 10, the electrode sheet cutting device 10 includes a first rotation shaft 11, a first cutting roll 20 fixed to the outer peripheral surface of the first rotation shaft 11, and a second rotation shaft 15. The second cutting roll 30 fixed to the outer peripheral surface of the second rotation shaft 15, the rotation drive device 40 for rotating the first rotation shaft 11 and the second rotation shaft 15, and the negative electrode sheet 56 to be cut And a transport device (not shown). The negative electrode sheet 56 passes between the first cutting roll 20 and the second cutting roll 30 as indicated by the left-pointing arrow in FIG. 10, so that the conveying direction DM (from the right to the left in FIG. Transport direction).

The first rotation shaft 11 has a cylindrical shape extending in the first axial direction DX1 (the direction in which the first axis AX1 which is the axis of the first cutting roll 20 extends), and the first rotation shaft is driven by the drive of the rotational drive device 40. It rotates in a first rotation direction DR1 (clockwise in FIG. 10) around a first axis AX1 which is an axis (central axis) of 11.
The second rotation shaft 15 has a cylindrical shape extending in the second axial direction DX2 (the direction in which the second axis AX2 which is the axis of the second cutting roll 30 extends), and the second rotation shaft 15 is driven by the rotation drive device 40. It rotates in a second rotation direction DR2 (counterclockwise in FIG. 10) around a second axis AX2 which is an axis (central axis) of the rotation shaft 15.

  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 the arrows in FIG. That is, the first rotation direction DR1 is a rotation direction opposite to the second rotation direction DR2. Thereby, the 1st cutting roll 20 and the 2nd cutting roll 30 rotate so that a rotation direction may become mutually reverse direction.

  The first cutting roll 20 is disposed on the first surface 58 b side (upper side in FIG. 10) with respect to the current collector foil 58 constituting the uncoated portion 56 b of the negative electrode sheet 56. The first cutting roll 20 is disposed such that the direction (first axial direction DX1) in which the first axis AX1, which is the axis of the first cutting roll 20, extends is the same as the width direction DB of the negative electrode sheet 56. It rotates around the first axis AX1 together with the rotation axis 11.

  The second cutting roll 30 is disposed on the second surface 58 c side (the lower side in FIG. 10) with respect to the current collector foil 58 constituting the uncoated portion 56 b of the negative electrode sheet 56. The second cutting roll 30 is disposed such that the direction in which the second axis AX2, which is the axis of the first cutting roll 20, extends (second axial direction DX2) coincides with the width direction DB of the negative electrode sheet 56, It rotates around the second axis AX2 together with the two rotation axes 15.

  The first cutting roll 20 and the second cutting roll 30 are a part of the first cutting roll 20 (a portion located below in FIGS. 9 and 10) and a part of the second cutting roll 30 (FIGS. 9 and 10) 10) are arranged to overlap in the width direction DB). And in the position where the 1st cutting roll 20 and the 2nd cutting roll 30 overlap about cross direction DB, the 1st rotation direction DR1 of the 1st cutting roll 20 and the 2nd rotation direction DR2 of the 2nd cutting roll 30 are negative electrode sheets It is set so as to be in the same direction (direction from right to left in FIG. 10) as the transport direction DM of 56.

  In addition, the first cutting roll 20 is positioned on one end side (right end side in FIG. 9) of the first cutting roll 20 in the first axial direction DX1 and is circumferentially extended over the entire circumference of the outer peripheral surface 20d of the first cutting roll 20 It has an annular first blade 25 extending in a direction (direction along the first rotation direction DR1). In the present embodiment, the first blade 25 is located at one end (the right end in FIG. 9) of the first cutting roll 20 in the first axial direction DX1.

  Furthermore, the first cutting roll 20 is a cylindrical first uneven portion 21 adjacent to the other end side (the left end side in FIG. 9) of the first blade portion 25 in the first axial direction DX1, It has a first uneven portion 21 whose surface is the uneven surface 21 d. As shown in FIG. 11, the first uneven portion 21 is constituted by a plurality of convex portions 21b and a plurality of concave portions 21c. FIG. 11 is a view for explaining a method of cutting the negative electrode sheet 56 by the electrode sheet cutting device 10, and shows a state when the negative electrode sheet 56 is cut by the first cutting roll 20 and the second cutting roll 30. As a longitudinal cross-sectional view of a position passing through the first axis AX1 and the second axis AX2, it is shown enlarged at a position corresponding to (corresponding to) part E of FIG.

  Further, in the present embodiment, the first uneven portion 21 is formed of a plurality of convex portions 21b (portions indicated by intersecting lines in FIG. 9) formed in a lattice shape, and a plurality of square shapes in plan view surrounded by the convex portions 21b. The recess 21 c (portion surrounded by the intersecting line in FIG. 9) is formed, and the protrusion 21 b and the recess 21 c are regularly arranged. It is preferable that the height difference (protruding height of the convex portion 21 b) between the convex portion 21 b and the concave portion 21 c be in the range of 15 to 25 μm. In addition, it is preferable that the distance between the convex portions 21b adjacent to each other across the concave portion 21c (the distance between the grids formed by the convex portions 21b) be, for example, about 0.2 mm.

  Further, the second cutting roll 30 is located on the other end side (left end side in FIG. 9) of the second cutting roll 30 in the second axial direction DX2 and extends over the entire circumference of the outer peripheral surface 30d of the second cutting roll 30. It has an annular second blade 35 extending in the circumferential direction (direction along the second rotation direction DR2). In the present embodiment, the second blade portion 35 is located at the other end (left end in FIG. 9) of the second cutting roll 30 in the second axial direction DX2.

  Furthermore, the second cutting roll 30 is a cylindrical second concavo-convex portion 31 adjacent to one end side (right end side in FIG. 9) of the second blade part 35 in the second axial direction DX2, Has a second uneven portion 31 which is the uneven surface 31 d. As shown in FIG. 11, the second uneven portion 31 is constituted by a plurality of convex portions 31b and a plurality of concave portions 31c. In the present embodiment, the second concavo-convex portion 31 is made equal (equivalent in size and shape) to the first concavo-convex portion 21.

  Specifically, the second concavo-convex portion 31 is a plurality of concave portions having a plurality of convex portions 31 b (portions indicated by intersecting lines in FIG. 9) formed in a lattice shape and a plurality of concave portions of a square in plan view surrounded by the convex portions 31 b. It is comprised by 31c (part enclosed by the line which cross | intersects in FIG. 9), and the convex part 31b and the recessed part 31c are arrange | positioned regularly. In addition, it is preferable to make the height difference (protrusion height of the convex part 31b) of the convex part 31b and the recessed part 31c into the range of 15-25 micrometers similarly to the 1st cutting roll 20. As shown in FIG. Further, as in the first cutting roll 20, it is preferable to set the distance between the convex portions 31b adjacent to each other across the concave portion 31c (the distance between the grids formed by the convex portions 31b) to, for example, about 0.2 mm.

  The negative electrode sheet 56 is placed between the first cutting roll 20 and the second cutting roll 30 as shown by a left-pointing arrow in FIG. , And is transported in the transport direction DM (direction from right to left in FIG. 10).

  The electrode sheet cutting device 10 rotates the uncoated portion 56b of the negative electrode sheet 56 moved (carried) in the length direction DA as described above, around the first axis AX1. (The first blade 25 and the second blade rotated around the first axis AX1) so as to be sandwiched by the first blade 25 and the second blade 35 of the second cutting roll 30 rotating around the second axis AX2 At a position where the second blade portion 35, which rotates around the axis AX2, overlaps with the width direction DB of the negative electrode sheet 56, the current-collecting foil 58 constituting the uncoated portion 56b is cut at position C (see FIGS. 7 and 8) Cut with.

  As shown in FIGS. 7 and 8, the cutting position C is a position at the center of the negative electrode sheet 56 in the width direction DB, and at the center (center line) of the uncoated portion 56b in the width direction DB. It is a position. Therefore, in the present embodiment, the negative electrode sheet 56 and the uncoated portion 56b can be cut into two equal parts in the width direction DB by the electrode sheet cutting device 10. In other words, two negative electrodes 156 (both uncoated portion 56 b and coated portion 56 c are equivalent) can be manufactured from one negative electrode sheet 56.

  Furthermore, the electrode sheet cutting device 10 according to the present embodiment collects the uncoated portion 56 b when cutting the current collecting foil 58 that forms the uncoated portion 56 b at the cutting position C as described above. The uneven surface 21d of the first uneven portion 21 is formed on the first surface 58b of the other end portion 58f of the foil 58 located on the other end side (the left end side in FIGS. 7 and 8) with respect to the cutting position C in the width direction DB. (Peripheral surface) is pressed while being rotated about the first axis AX1 and at one end side of the cutting position C in the width direction DB of the current collector foil 58 constituting the uncoated portion 56b (FIG. 7 and FIG. The uneven surface 31d (the outer peripheral surface) of the second uneven portion 31 is configured to be pressed while rotating around the second axis AX2 on the second surface 58c of the one end side portion 58g located on the right end side in 8). (See FIGS. 9 to 11).

  Therefore, in the electrode sheet cutting device 10 of the present embodiment, the uncoated portion 56b of the negative electrode sheet 56 moved (carried) in the length direction DA is, as shown in FIG. 11, around the first axis AX1. The current-collecting foil 58 constituting the uncoated portion 56b is cut by the first blade 25 (upper blade) rotating in the second direction and the second blade 35 (lower blade) rotating around the second axis AX2. The uneven surface 21d of the first uneven portion 21 rotates about the first axis AX1 with respect to the first surface 58b of the other end portion 58f of the current collector foil 58 constituting the uncoated portion 56b while cutting in By pressing the outer peripheral surface, specifically, the convex portion 21b), the other end side portion 58f of the current collector foil 58 constituting the uncoated portion 56b is deformed into a concavo-convex shape, and the uncoated portion 56b is The second surface 58c of the one end side portion 58g of the current collector foil 58 has a second axis By pressing the uneven surface 31d (the outer peripheral surface, specifically, the convex portion 31b) of the second uneven portion 31 which rotates around AX2, one end side portion 58g of the current collector foil 58 constituting the uncoated portion 56b is It can be deformed into an uneven shape.

  Here, one end side portion 58g of the current collector foil 58 constituting the uncoated portion 56b of the negative electrode sheet 56 is one negative electrode 156 (two negative electrodes 156 manufactured by cutting the negative electrode sheet 56 ( It is a site | part used as the negative mix layer layer uncoated part 156b of the negative electrode 156 of the right side in FIG. In addition, the other end portion 58 f of the current collector foil 58 constituting the uncoated portion 56 b of the negative electrode sheet 56 is the other negative electrode 156 (two negative electrodes 156 produced by cutting the negative electrode sheet 56 ( It is a site | part used as the negative mix layer layer uncoated part 156b of the negative electrode 156 of the left side in FIG.

  Therefore, according to the electrode sheet cutting device 10 of the present embodiment, by cutting the strip-shaped negative electrode sheet 56 in the length direction DA, two strip-shaped negative electrodes 156 extending in the length direction DA are produced. The negative electrode mixture layer uncoated portion 156b (the portion to be the negative electrode mixture layer uncoated portion 156b) of the two negative electrodes 156 can be deformed into a concavo-convex shape. Thus, as the negative electrode 156, it is possible to obtain the negative electrode 156 in which the surface (the first surface 158b and the second surface 158c) of the negative electrode composite material layer uncoated portion 156b has an uneven shape.

  In addition, in the electrode sheet cutting device 10 according to the present embodiment, the negative electrode sheet conveyed at a position adjacent to the first cutting roll 20 on the downstream side (left side in FIG. 10) of the negative electrode sheet 56 in the conveyance direction DM. The first surface 58b side (upper side in FIG. 10) of the current collector foil 58 of 56 and the downstream side (left side in FIG. 10) of the second cutting roll 30 in the transport direction DM of the negative electrode sheet 56 A dust collection port (not shown) of a dust collector (not shown) is disposed on the second surface 58c side (lower side in FIG. 10) of the current collector foil 58 of the negative electrode sheet 56 being conveyed.

  As a result, when the uncoated portion 56b of the negative electrode sheet 56 is cut by the first blade portion 25 and the second blade portion 35 of the electrode sheet cutting device 10, even if foreign matter such as metal powder is generated, the foreign matter Can be removed by suction with a dust collector. Furthermore, when the non-coated portion 56b of the negative electrode sheet 56 is deformed into a concavo-convex shape by the first concavo-convex portion 21 and the second concavo-convex portion 31 of the electrode sheet cutting device 10, foreign matter such as metal powder is generated. However, the foreign matter can be sucked and removed by the dust collector.

  As described above, in the electrode sheet cutting device 10 according to the present embodiment, the uncoated portion 56b (after cutting, the negative electrode mixture layer uncoated portion 156b of the two negative electrodes 156 and the negative electrode sheet 56 are simultaneously cut. Can be deformed into a concavo-convex shape. Thus, in addition to the step (device) for cutting the negative electrode sheet 56, the step (device) for deforming the negative electrode material layer uncoated portion 156b (uncoated portion 56b) into a concavo-convex shape is provided, The manufacturing time can be shortened and the manufacturing cost can also be reduced.

  In addition to the cutting step (cutting device) for cutting the negative electrode sheet 56, a deformation step (deforming device) for deforming the negative electrode mixture layer uncoated portion 156b (uncoated portion 56b) into a concavo-convex shape is provided. In addition to the dust collector in the cutting process (cutting device), it is necessary to provide the dust collector in the deformation process (deforming device).

  On the other hand, in the present embodiment, as described above, the cutting of the negative electrode sheet 56 and the deformation of the uncoated portion 56b are performed simultaneously (by one electrode sheet cutting device 10). Foreign matter such as metal powder produced when uncoated portion 56b of negative electrode sheet 56 is deformed into a concavo-convex shape by a dust collector for sucking and removing foreign matter such as metal powder produced when cutting coated portion 56b It can also be removed by suction. That is, in the present embodiment, the dust collector for attracting and removing foreign matter such as metal powder generated when cutting the uncoated portion 56b of the negative electrode sheet 56 is formed into the uneven shape of the uncoated portion 56b of the negative electrode sheet 56 It is also used as a dust collector that sucks and removes foreign substances such as metal powder generated when deformed. For this reason, compared with the case where the dust collector of a deformation | transformation process (deformation apparatus) is provided separately from the dust collector of a cutting process (cutting device), installation cost can be reduced and it becomes low cost.

  Next, an electrode assembly 150 is manufactured using the negative electrode 156 manufactured as described above, the positive electrode 155, and the separator 157. Specifically, as shown in FIG. 12, the negative electrode 156, the separator 157, the positive electrode 155, and the separator 157 are wound so as to overlap in this order. In detail, the positive electrode mixture layer uncoated portion 155b of the positive electrode 155 and the negative electrode mixture layer uncoated portion 156b of the negative electrode 156 are positioned opposite to each other in the width direction DB (left and right direction in FIG. 12) Then, the negative electrode 156, the separator 157, the positive electrode 155, and the separator 157 are wound into a flat shape to form an electrode body 150 (see FIG. 2).

  The electrode body 150 is a part of the positive electrode current collector foil 151 (positive electrode mixture layer uncoated portion 155b) at one end (right end in FIGS. 1 and 2) of the width direction DB of the electrode body 150. A plurality of rectangular metal foil portions 155 b 1 have a plurality of metal foil laminated portions 155 d laminated in the lamination direction DC (the thickness direction of the electrode body 150), and the other end of the width direction DB of the electrode body 150 ( In FIG. 1 and FIG. 2, a plurality of rectangular metal foil portions 156 b 1 which are a part of the negative electrode current collector foil 158 (negative electrode mixture layer uncoated portion 156 b) are shown in FIG. A metal foil laminated portion 156d laminated in the thickness direction 150).

  Further, the terminal-attached lid member 160 (see FIG. 13) is manufactured. Specifically, the lid portion 112, the positive electrode terminal member 120, and the negative electrode terminal member 130 are prepared, and these are assembled and integrated. As a result, as shown in FIG. 13, a terminal-attached lid member 160 having the lid 112, the positive electrode terminal member 120, and the negative electrode terminal member 130 is obtained.

  Next, the metal foil laminated portion 156 d of the negative electrode mixture layer uncoated portion 156 b of the electrode body 150 is resistance-welded to the plate-like negative electrode current collector terminal 132 (metal plate) included in the terminal-attached lid member 160. Join. The resistance welder 60 used in the present embodiment has a first electrode tip 70 and a second electrode tip 80, as shown in FIG.

  The first electrode tip 70 and the second electrode tip 80 are a pair of electrode tips, and a laminate in which the metal foil laminate portion 156 d and the negative electrode current collector terminal 132 are laminated (superposed) in the laminating direction DC between them. It is a member for supplying a welding current to the laminated body 181 in a state where the pressure is applied by sandwiching 181. The first electrode tip 70 is movable in the stacking direction DC (up and down direction in FIG. 14). On the other hand, the second electrode tip 80 is fixed and immobile. Here, the direction (downward in FIG. 14) from the metal foil laminated portion 156d side toward the negative electrode current collector terminal 132 in the lamination direction DC is taken as a first lamination direction DC1.

  In the present embodiment, first, in a state where the laminate 181 is disposed between the first electrode tip 70 and the second electrode tip 80, the first electrode chip 70 causes the metal foil laminate portion 156d to receive the first lamination direction. By applying a predetermined (prescribed) compressive load F1 to DC1 (downward in FIG. 14), the first electrode tip 70 and the second electrode tip 80 form a laminate 181 (metal foil laminate portion 156d and the negative electrode current collector terminal 132). ) In a stacking direction DC with a constant compression load F1. In this state, a current of a fixed magnitude is supplied between the first electrode tip 70 and the second electrode tip 80 for a fixed time (for example, 20 ms), and the metal foil laminated portion 156 d and the negative electrode current collector terminal 132 ( Resistance welding the laminated body 181).

  Conventionally, when resistance welding as described above is performed, only a part (a narrow range of the chip opposing surfaces) of the chip opposing surface facing the tip surface of the first electrode tip 70 in the metal foil laminated portion is selected. The welding current may be concentrated on a part of the chip opposing surface of the metal foil laminated portion (a narrow range of the chip opposing surfaces) to cause spattering.

  On the other hand, in the present embodiment, as described above, the surface (the first surface 158 b and the second surface 158 c) of the negative electrode composite material layer uncoated portion 156 b constituting the metal foil laminated portion 156 d has an uneven shape. It is set as an uneven surface (refer FIG.11 and FIG.14). Therefore, in the chip facing surface 156f of the metal foil laminated portion 156d facing the tip surface 70b of the first electrode tip 70, the convex portion of the negative electrode current collector foil 158 projecting toward the tip surface 70b of the first electrode tip 70 is A plurality (plural) of the chips are disposed in a distributed manner over the entire chip facing surface 156f (see FIG. 14).

  Thereby, at the time of resistance welding, among the chip facing surfaces 156f of the metal foil laminated portion 156d, a large number of (plural) convex portions protruding toward the tip surface 70b of the first electrode tip 70 are at least those of the first electrode tip 70. The end surface 70b can be closely attached. Thereby, the welding current can be dispersed over the entire chip opposing surface 156f of the metal foil laminated portion 156d (that is, the concentration of the welding current in the narrow range of the chip opposing surface 156f can be suppressed). Sputtering can be suppressed.

  Therefore, in the present embodiment, unlike in Patent Document 1, it is possible to suppress the occurrence of spattering at the time of resistance welding without making the tip surface of the first electrode tip in contact with the metal foil laminated portion uneven. . For this reason, in the present embodiment, unlike the patent document 1, "the uneven surface (convex portion) which is the tip surface of the first electrode tip according to the use of the resistance welding machine (while increasing the number of times of resistance welding) May be worn away, or a part of the molten metal foil may be intruded into the concaves and concaves of the uneven surface to reduce the unevenness of the tip surface, and the occurrence of sputtering can not be suppressed. Since it does not exist, it becomes possible to use a 1st electrode tip over a long period of time compared with patent document 1. FIG.

  Next, the plate-like positive electrode current collection terminal 122 included in the terminal-attached lid member 160 is joined to the metal foil laminated portion 155 d of the positive electrode mixture material layer uncoated portion 155 b of the electrode body 150 by ultrasonic welding. Specifically, the metal foil laminated portion 155 d and the positive electrode current collector terminal 122 are pressed against each other by an ultrasonic anvil and an ultrasonic horn not shown. In this state, the ultrasonic horn is ultrasonically vibrated to bond the positive electrode current collector terminal 122 to the metal foil laminated portion 155d. As a result, as shown in FIG. 15, the positive electrode terminal member 120 and the positive electrode 155 are electrically connected, and the negative electrode terminal member 130 and the negative electrode 156 are electrically connected. The terminal-equipped electrode assembly 170 integrated with the electrode assembly 150 is completed.

  Thereafter, the electrode body 150 of the terminal-equipped electrode assembly 170 is accommodated in the rectangular accommodation portion 111, and the opening of the rectangular accommodation portion 111 is closed by the lid portion 112. Next, the lid portion 112 and the rectangular housing portion 111 are welded. In addition, the liquid injection hole 112b which penetrates the cover part 112 is formed in the center of the cover part 112 (refer FIG. 1). Subsequently, the non-aqueous electrolyte solution 140 is injected into the battery case 110 through the injection hole 112 b of the battery case 110, and the non-aqueous electrolyte solution 140 is impregnated into the electrode body 150. Thereafter, the liquid injection hole 112b is sealed by the liquid injection lid 114, whereby the secondary battery 100 is completed (see FIG. 1).

  Although the present invention has been described based on the embodiments, the present invention is not limited to the above embodiments, and it goes without saying that the present invention can be appropriately modified and applied without departing from the scope of the invention.

  For example, in the embodiment, the uneven surface 21d of the first uneven portion 21 of the first cutting roll 20 has a plurality of convex portions 21b formed in a lattice shape and a plurality of rectangular shapes in plan view surrounded by the convex portions 21b. The recesses 21 c are regularly and alternately arranged along the outer peripheral surface of the first cutting roll 20. Further, the concavo-convex surface 31 d of the second concavo-convex portion 31 of the second cutting roll 30 also has the same form as this. However, the form of the concavo-convex surface of the first concavo-convex part and the form of the concavo-convex surface of the second concavo-convex part are not limited to such a form, and any form may be used. However, it is preferable to set it as the form by which the convex part and the recessed part are arrange | positioned regularly (alternately) along the outer peripheral surface of a 1st cutting roll and a 2nd cutting roll.

  In the embodiment, a flat wound electrode body 150 is produced as an electrode body, and a negative electrode current collector foil 158 constituting the flat wound electrode body 150 as a metal foil laminated portion to be subjected to resistance welding. In the end portion of the negative electrode mixture layer uncoated portion 156b, a plurality of rectangular portions (which correspond to metal foil portions) aligned in the stacking direction DC are illustrated as being stacked in the stacking direction DC. . However, the electrode body and the metal foil laminate portion are not limited to these.

  Specifically, for example, a stack-type electrode assembly in which a plurality of strip-like positive electrodes, strip-like negative electrodes, and strip-like separators are used as an electrode body, and the positive electrode and the negative electrode are alternately stacked with the separator interposed therebetween. May be produced. The metal foil laminated portion is an uncoated portion of the electrode layer (positive electrode current collector foil or negative electrode current collector foil) of the current collector foil of the electrode constituting the laminated electrode body (a composite layer uncoated portion made of only metal foil) A plurality of foil portions may be stacked in the stacking direction).

  In this case, the uncoated portion 56b is deformed into a concavo-convex shape simultaneously with the cutting of the negative electrode sheet 56 by the electrode sheet cutting device 10 to produce two negative electrodes 156, and then each negative electrode 156 is cut at a constant interval. Then, a large number of rectangular electrodes in a plan view rectangular shape (strip shape) having a predetermined length may be manufactured.

  Moreover, in the embodiment, an example in which the negative electrode sheet 56 is used as an electrode sheet cut by the electrode sheet cutting device 10 is shown. However, the present invention can also be applied to the case of cutting a positive electrode sheet as an electrode sheet. That is, the uncoated portion of the positive electrode sheet moving in the length direction is the uncoated portion by the first blade portion rotating around the first axis and the second blade portion rotating around the second axis. Of the first uneven portion rotating around the first axis with respect to the first surface of the other end side portion of the current collector foil constituting the uncoated portion while cutting the current collector foil constituting the By pressing the surface, the other end side portion of the current collector foil constituting the uncoated portion is deformed into a concavo-convex shape, and on the second surface of the one end side portion of the current collector foil constituting the uncoated portion, One end side portion of the current collector foil constituting the uncoated portion may be deformed into a concavo-convex shape by pressing the concavo-convex surface of the second concavo-convex portion rotating around the second axis.

DESCRIPTION OF SYMBOLS 10 electrode sheet cutting device 20 1st cutting roll 21 1st uneven part 21b, 31b convex part 21c, 31c recessed part 21d uneven surface 25 1st blade part 30 2nd cutting roll 31 2nd uneven part 31d uneven surface 35 2nd blade part 56 Negative electrode sheet (electrode sheet)
56b uncoated portion 56c coated portion 58b first surface 58c second surface 58 current collector foil 58f other end side portion 58g one end side portion 59 negative electrode mixture layer (electrode mixture layer)
60 resistance welding machine 70 first electrode tip 80 second electrode tip 100 secondary battery 110 battery case 112 lid 130 negative electrode terminal member 132 negative electrode current collector terminal 150 electrode body 155 positive electrode 156 negative electrode (electrode)
156b negative electrode mixture layer uncoated portion 156c negative electrode mixture layer coated portion 156d metal foil laminated portion 157 separator 158 negative electrode current collector foil (metal foil)
159 Negative electrode mixture layer 160 Terminal-attached lid member 170 Terminal-attached electrode body 181 laminated body AX1 first axis AX2 second axis C cut position DA length direction DB width direction DC lamination direction DX1 first axis direction DX2 second axis direction

Claims (1)

A strip-shaped electrode having a strip-shaped current collector foil having a first surface and a second surface, and a strip-shaped electrode mixture layer coated on the first surface and the second surface of the current collector foil An electrode sheet cutting apparatus for cutting a sheet in its length direction to produce two strip-like electrodes extending in the length direction, wherein
The electrode sheet is
Two coated portions in which the electrode mixture layer is coated on the first surface and the second surface of the current collector foil, and in the form of a strip extending in the length direction, the length Two coated parts spaced apart in the width direction orthogonal to the direction;
An uncoated portion in which the electrode mixture layer is not coated on the first surface and the second surface of the current collector foil, and in the form of a strip extending in the length direction, the two coatings And an uncoated part located between the working parts;
The electrode sheet cutting device is
It is a 1st cutting roll arrange | positioned with respect to the said current collection foil which comprises the said uncoated part at the said 1st surface side, Comprising: The 1st axial direction which the 1st axis line which is an axis of the said 1st cutting roll extends A first cutting roll that rotates about the first axis with the second sheet in the width direction of the electrode sheet;
A second cutting roll disposed on the second surface side with respect to the current collector foil constituting the uncoated portion, wherein a second axis line extending the axis of the second cutting roll extends And a second cutting roll that rotates about the second axis with the second sheet in the width direction of the electrode sheet,
The first cutting roll is
An annular first blade portion positioned on one end side of the first cutting roll in the first axial direction and extending in the circumferential direction all around the outer peripheral surface of the first cutting roll;
And a first uneven portion which is a cylindrical first uneven portion adjacent to the other end side in the first axial direction with respect to the first blade portion, and whose outer peripheral surface is an uneven surface,
The second cutting roll is
An annular second blade portion located on the other end side of the second cutting roll in the second axial direction and extending in the circumferential direction all around the outer peripheral surface of the second cutting roll;
A second uneven portion having a cylindrical shape and being adjacent to one end side in the second axial direction with respect to the second blade portion, wherein an outer peripheral surface thereof is an uneven surface;
The electrode sheet cutting device is
The uncoated portion of the electrode sheet moving in the length direction is rotated around the first axis of the first cutting roll, which rotates around the first axis, and the second axis. When the current collector foil constituting the uncoated portion is cut at a cutting position so as to be sandwiched by the second blade portion of the second cutting roll, the current collector foil constituting the uncoated portion The uneven surface of the first uneven portion is pressed against the first surface of the other end side portion located on the other end side than the cutting position in the width direction while rotating around the first axis. At the same time, the uneven surface of the second uneven portion is provided on the second surface of the one end side portion of the current collector foil constituting the uncoated portion, which is located closer to the one end than the cutting position in the width direction. Configured to be pressed while being rotated about the second axis It has been,
Of the electrode sheet moving in the length direction, the uncoated portion is rotated by the first blade rotating around the first axis and the second blade rotating around the second axis. In a manner such that the current collector foil constituting the uncoated portion is cut at the cutting position in a sandwiching manner, the first surface of the other end side portion of the current collector foil constituting the uncoated portion is By pressing the uneven surface of the first uneven portion rotating around a first axis, the other end side portion of the current collector foil is deformed into an uneven shape, and the uncoated portion is configured. The uneven surface of the second uneven portion rotating around the second axis is pressed against the second surface of the one end side portion of the current collector foil, whereby the one end side portion of the current collector foil is roughened An electrode sheet cutting device that deforms into a shape.

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