JP2017191728A - Method of manufacturing electrode, and rotary die cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of manufacturing an electrode, capable of positioning a cut-out electrode even during transportation, and a rotary die cutter.SOLUTION: In a method of manufacturing an electrode, when an electrode material 20 is allowed to pass through between a die roll 35 and an anvil roll 45 while being transported, the electrode material 20 is cut along the shape of a cutting edge 40 while an exposed portion 23 is raised from a peripheral surface of the anvil roll 45 by a raised portion 46. At this time, a non-cutting portion 23b is formed, by a gap S formed between a second coated portion 22b and the raised portion 46, to the exposed portion 23 corresponding to the gap S.SELECTED DRAWING: Figure 6

Description

  The present invention relates to an electrode manufacturing method and a rotary die cutter including a cutting step of cutting a strip-shaped electrode material into the shape of an individual electrode.

  For example, vehicles such as EV (Electric Vehicle) and PHV (Plug in Hybrid Vehicle) are equipped with a power storage device for storing electric power used by a motor as a drive source. As such a power storage device, for example, a secondary battery such as a lithium ion secondary battery or a nickel hydride secondary battery is known. The secondary battery includes an electrode assembly in which positive and negative electrodes each having an active material layer are layered. As the structure of the electrode assembly, a long positive electrode and a negative electrode of a certain length are wound in a cylindrical shape in an overlapping state, and a large number of positive and negative electrodes having a substantially rectangular shape are alternately arranged. A stacked type is known. For example, in an electrode such as a lithium ion secondary battery, a configuration including a metal foil as a current collector and an active material layer on the surface of the metal foil is frequently used.

  For example, Patent Document 1 discloses an apparatus provided with a rotary die cutter that cuts a predetermined rectangular electrode by cutting a strip-shaped electrode material as an apparatus used in an electrode manufacturing process.

JP 2009-66676 A

  When the stacked electrode assembly is employed, the positive electrode or the negative electrode that has been separated into individual pieces after the above-described cutting step is once laminated individually in a container (magazine) in the manufacturing process of the power storage device. Or directly conveyed to a laminating apparatus and used for forming an electrode assembly. However, when a piece of electrode is cut out from a strip-shaped electrode material, when the electrode cut from the electrode material is transferred from the rotary die cutter to a transport device, for example, a belt conveyor, the posture thereof varies. For example, the electrode that has become a piece is easily rotated or displaced even by a force received when one end in the width direction first comes into contact with the belt conveyor. In this way, when the position and posture of the electrodes that have become individual variations are large, both when accumulating in the container and when laminating in the laminating apparatus, the device / process for adjusting the posture once before that. Is required.

  The present invention has been made paying attention to the problems existing in the above prior art, and an object of the present invention is to provide an electrode manufacturing method and a rotary die cutter capable of positioning the cut-out electrode even during conveyance. There is.

  An electrode manufacturing method for solving the above-described problems is a coating portion formed on the surface of the strip-shaped current collector foil, and is adjacent to the coating portion and along the longitudinal direction of the strip-shaped current collector foil. An exposed portion of the strip-shaped current collector foil, and an electrode manufacturing method comprising a cutting step of cutting an electrode material into the shape of an individual electrode, wherein the cutting step has a peripheral surface A die roll, and a rotary die cutter including an anvil roll disposed to face the peripheral surface of the die roll, and when passing between the die roll and the anvil roll while conveying the electrode material, a raised portion While raising the exposed portion from the peripheral surface of the anvil roll, the electrode material is cut along the shape of the cutting edge, and the gap formed between the coated portion and the raised portion, Against this gap And summarized in that forming the uncut portion in the exposed portion was.

  According to this, when the electrode material passes between the die roll and the anvil roll, it is raised from the anvil roll by the raising portion even if it is an exposed portion located higher than the peripheral surface of the anvil roll due to the thickness of the coating portion. It is supported at the position.

  In a portion corresponding to the gap in the exposed portion, a part of the cutting blade pressed against the exposed portion escapes into the gap, and a non-cut portion where the exposed portion is connected while the cutting blade is pressed is formed. For this reason, the part cut out as an electrode and the part different from an electrode are connected by the non-cut | disconnecting part. Therefore, when the cut electrode is transferred from the rotary die cutter to, for example, the transport device, it is possible to prevent the posture from being varied. Therefore, it is not necessary to adjust the posture of the electrode when the cut-out electrode is accumulated in the container in the subsequent process of the cutting process or when the stacking apparatus performs stacking.

Moreover, about the manufacturing method of an electrode, in the process in which the said electrode material is cut | disconnected, in the said non-cutting part, the said cutting blade may be pressed and a notch may be formed in the said exposed part.
According to this, in a cutting process, a notch is formed simultaneously with a non-cutting part being formed. For this reason, by forming a cut in the exposed portion, the thickness of the uncut portion becomes thinner than the exposed portion, and the portion cut out as an electrode can be easily separated from the portion different from the electrode.

Moreover, about the manufacturing method of an electrode, the said notch | incision is formed by the said exposed part being cut by a part of cutting blade extended along the conveyance direction of the said electrode material.
According to this, the non-cut portion and the cut are formed in a state extending along the transport direction. For this reason, the non-cut portion is cut as the electrode is guided in the transport direction, and the non-cut portion can be easily cut.

  In addition, the electrode manufacturing method includes a step of breaking the non-cut portion, and in the breaking step, a portion of the electrode material cut out as the electrode is moved in a first direction that is a conveyance direction of the electrode material. While guiding, a portion different from the portion cut out as the electrode is guided in a direction different from the first direction.

  According to this, since the guide directions are different, a load is applied to the non-cut portion. The uncut portion is broken by this load. For this reason, an uncut part can be fractured with a simple configuration.

  A rotary die cutter for solving the above-mentioned problems is a coating portion formed on the surface of the strip-shaped current collector foil, and is adjacent to the coating portion and exists along the longitudinal direction of the strip-shaped current collector foil. A rotary die cutter that cuts an electrode material having an exposed exposed portion of a strip-shaped current collector foil into the shape of an individual electrode, the die roll having a cutting edge on the peripheral surface, and facing the peripheral surface of the die roll An anvil roll disposed as a part of the electrode material passing between the die roll and the anvil roll, and having a raised portion that raises the exposed portion from the peripheral surface of the anvil roll, and the coating portion. The gist is that a gap exists between the raised portion and a part of the cutting blade is disposed corresponding to the gap.

  According to this, when the electrode material passes between the die roll and the anvil roll, it is raised from the anvil roll by the raising portion even if it is an exposed portion located higher than the peripheral surface of the anvil roll due to the thickness of the coating portion. It is supported at the position. In the portion corresponding to the gap in the exposed portion, a part of the cutting blade pressed against the exposed portion can be released to the gap, and the exposed portion can be formed with a non-cut portion connected to the exposed portion. it can. For this reason, the part cut out as an electrode can be cut | disconnected by the rotary die cutter in the state connected with the part different from an electrode, and the non-cut | disconnecting part.

  As a result, when the cut electrode is transferred from the rotary die cutter to, for example, the transfer device, it is possible to prevent the posture from being varied. Therefore, it is not necessary to adjust the posture of the electrode when the cut-out electrode is accumulated in the container in the subsequent process of the cutting process or when the stacking apparatus performs stacking.

  According to the present invention, the cut-out electrode can be positioned even during conveyance.

The perspective view which shows a secondary battery typically. The perspective view which shows an electrode assembly typically. (A) is a side view schematically showing an electrode manufacturing facility, and (b) is an enlarged sectional view showing an electrode material. The perspective view which shows a rotary die cutter typically. (A) is a top view which shows the cutting plan line of a positive electrode, (b) is a top view which shows the cutting plan line of a negative electrode. (A) is a figure which shows the state which cut | disconnects the electrode material of a positive electrode with a rotary die cutter, (b) is an expanded sectional view which shows a notch and a non-cutting part. The top view which shows the state which cut | disconnected the electrode material of the positive electrode. (A) is a figure which shows the state which cuts the electrode material of a negative electrode with a rotary die cutter, (b) is an expanded sectional view which shows the blade part vicinity of a tab. The top view which shows the state which cut the negative electrode. The perspective view which shows the state which cut out the positive electrode. The side view which shows typically another example of a rotary die cutter. The side view which shows typically another example of a rotary die cutter. The top view which shows another example of a negative electrode.

Hereinafter, an embodiment of an electrode manufacturing method and a rotary die cutter will be described with reference to FIGS.
As shown in FIG. 1, the secondary battery 10 is, for example, a lithium ion secondary battery. The secondary battery 10 includes an electrode assembly 11, an electrolyte solution (not shown), and a case 12 that houses the electrode assembly 11 and the electrolyte solution.

  As shown in FIG. 2, the electrode assembly 11 includes a plurality of positive electrodes 13 as electrodes, a plurality of negative electrodes 16 as electrodes, and a plurality of separators 24. The positive electrode 13 and the negative electrode 16 overlap each other in a state of being insulated from each other by the separator 24.

  The positive electrode 13 has a rectangular sheet shape. The positive electrode 13 includes a positive electrode current collector foil 14. The positive electrode current collector foil 14 is, for example, an aluminum foil. The positive electrode 13 includes a positive electrode active material layer 15 that covers both surfaces of the positive electrode current collector foil 14. The positive electrode 13 includes a positive electrode tab 14 a having a shape protruding from one side of the positive electrode current collector foil 14.

  The positive electrode 13 includes a first edge 13a along the protruding long side of the positive electrode tab 14a. The positive electrode tab 14a has a shape protruding from the middle of the first edge 13a. The positive electrode 13 includes a second edge 13b on the long side opposite to the first edge 13a. In addition, the positive electrode 13 includes a third edge 13c on a short side connecting one ends of the first edge 13a and the second edge 13b, and the other ends of the first edge 13a and the second edge 13b are connected to each other. A fourth edge 13d is provided on the short side to be connected.

The positive electrode 13 includes a positive electrode uncoated portion 14b along the first edge 13a. The positive electrode uncoated portion 14b is a portion where the positive electrode active material layer 15 is not present and the positive electrode current collector foil 14 is exposed.
The negative electrode 16 has a rectangular sheet shape. The negative electrode 16 includes a negative electrode current collector foil 17. The negative electrode current collector foil 17 is, for example, a copper foil. The negative electrode 16 includes a negative electrode active material layer 18 that covers both surfaces of the negative electrode current collector foil 17. The negative electrode 16 includes a negative electrode tab 17 a that protrudes from one side of the negative electrode current collector foil 17.

  The negative electrode 16 includes a first edge 16a along the protruding long side of the negative electrode tab 17a. The negative electrode tab 17a has a shape protruding from the middle of the first edge 16a. The negative electrode 16 includes a second edge 16b on the long side opposite to the first edge 16a. Further, the negative electrode 16 includes a third edge 16c on a short side connecting one ends of the first edge 16a and the second edge 16b, and the other ends of the first edge 16a and the second edge 16b are connected to each other. A fourth edge 16d is provided on the short side to be connected.

  The length of two adjacent sides (long side and short side) of the negative electrode 16 is longer than the length of two adjacent sides (long side and short side) of the positive electrode 13, and the negative electrode 16 is longer than the positive electrode 13. Around big. Further, the length of two adjacent sides (long side and short side) of the negative electrode active material layer 18 is longer than the length of two adjacent sides (long side and short side) of the positive electrode active material layer 15, and the negative electrode active material layer 18 is slightly larger than the positive electrode active material layer 15. The planar shape of the separator 24 is the same as the planar shape of the negative electrode 16 and is slightly larger than the positive electrode 13.

Next, the electrode manufacturing equipment 30 will be described.
As shown in FIG. 3A and FIG. 4, the electrode manufacturing facility 30 is a facility for performing a cutting process for cutting the strip-shaped electrode material 20 into the shape of the individual positive electrode 13 or negative electrode 16. The electrode material 20 is supplied to the electrode manufacturing facility 30.

  The transport direction D <b> 1 indicates the direction in which the electrode material 20 is transported in the electrode manufacturing facility 30. The transport direction D1 coincides with the longitudinal direction of the electrode material 20. Moreover, the width direction D2 has shown the direction orthogonal to the conveyance direction D1 among the directions along the surface of the electrode material 20. FIG.

Here, the electrode material 20 will be described.
As shown in FIGS. 3B and 4, the strip-shaped electrode material 20 is formed on the strip-shaped current collector foil 21, the first coating portion 22 a existing on one surface of the strip-shaped current collector foil 21, and the other surface. And an existing second coating part 22b. In the electrode material 20 for the positive electrode 13, the strip-shaped current collector foil 21 is a portion to be the positive current collector foil 14. In the electrode material 20 for the negative electrode 16, the strip-shaped current collector foil 21 is the negative electrode current collector foil 17. It is a part to become. Further, in the electrode material 20 for the positive electrode 13, the coating portions 22 a and 22 b are portions to be the positive electrode active material layer 15, and in the electrode material 20 for the negative electrode 16, the coating portions 22 a and 22 b. Is a portion to be the negative electrode active material layer 18.

  Each coating part 22a, 22b is formed by applying a paste-like active material mixture, which is a mixture of an active material, a conductive agent, a solvent and a binder, to the surface of the strip-shaped current collector foil 21, drying, and then pressurizing. Yes. Each coating part 22a, 22b extends along the longitudinal direction of the electrode material 20 in a band shape with a certain width. The electrode material 20 includes an exposed portion 23 that exists along the longitudinal direction of the electrode material 20. In the present embodiment, the electrode material 20 includes an exposed portion 23 that exists along both of the long edge portions E1 and E2. Each exposed portion 23 is exposed with a constant width along the longitudinal direction of the strip-shaped current collector foil 21. The exposed portion 23 is a portion where the coating portions 22a and 22b do not exist in the strip-shaped current collector foil 21, and is a portion where the strip-shaped current collector foil 21 is exposed. The exposed portion 23 is adjacent to the width direction D2 of the electrode material 20 with respect to the first coating portion 22a and the second coating portion 22b. In the present embodiment, one exposed portion 23, the coating portions 22a and 22b, and the other exposed portion 23 are arranged along the width direction D2 of the electrode material 20.

The electrode manufacturing facility 30 will be described in detail.
As shown in FIG. 3A and FIG. 4, the electrode manufacturing facility 30 includes a supply unit 31 that supplies the electrode material 20. The supply unit 31 includes a holder 32 that supports the electrode material 20 wound in a roll shape. The holder 32 delivers the electrode material 20 in accordance with the conveying speed of the electrode material 20. The electrode manufacturing facility 30 includes a pair of cylindrical transport rollers 33 that transport the electrode material 20 with the electrode material 20 interposed therebetween. The axis of the transport roll 33 extends along the width direction D2. The transport roll 33 is rotated around the axis by a driving device (not shown). In addition, the electrode material 20 is conveyed in the state in which the 2nd coating part 22b becomes a lower side.

  The electrode manufacturing facility 30 includes a rotary die cutter 34. The rotary die cutter 34 is a device for cutting the electrode material 20 along a predetermined cutting line 20 a along the outer shape of the positive electrode 13 or the negative electrode 16. The planned cutting line 20a is a part of the electrode material 20 where cutting is planned. In this embodiment, the planned cutting line 20a has the same shape as the contour of the positive electrode 13 or the negative electrode 16 that is a predetermined shape, and is a closed ring.

  As shown in FIG. 5A, the portion corresponding to the first edge 13 a and the positive electrode tab 14 a of the positive electrode 13 in the planned cutting line 20 a of the positive electrode 13 is set on the exposed portion 23, and the first The edge 13a extends in the transport direction D1, and the positive electrode tab 14a extends in the transport direction D1 and the width direction D2. Of the planned cutting line 20a, portions corresponding to the third edge 13c and the fourth edge 13d of the positive electrode 13 are set across the exposed portion 23 and the coating portions 22a and 22b, and the width of the electrode material 20 is set. It extends in the direction D2. Of the planned cutting line 20a, a portion corresponding to the second edge 13b of the positive electrode 13 is set on the coating portions 22a and 22b and extends in the transport direction D1 of the electrode material 20.

  As shown in FIG. 5B, portions of the planned cutting line 20a of the negative electrode 16 corresponding to the first edge 16a of the negative electrode 16 and the base end side of the negative electrode tab 17a are coated portions 22a and 22b. Is set on. Of the planned cutting line 20a, a portion corresponding to the first edge 16a extends in the transport direction D1 of the electrode material 20, and a portion corresponding to the base end side of the negative electrode tab 17a extends in the width direction D2. A portion of the planned cutting line 20 a corresponding to the tip side of the negative electrode tab 17 a is set on the exposed portion 23. Of the planned cutting line 20a, portions corresponding to the third edge 16c and the fourth edge 16d of the negative electrode 16 are set on the coating portions 22a and 22b and extend in the width direction D2 of the electrode material 20. Moreover, the part corresponding to the 2nd edge 16b among the cutting cutting lines 20a is set on the coating parts 22a and 22b, and is extended in the conveyance direction D1 of the electrode material 20. FIG.

  As shown in FIG. 4, the rotary die cutter 34 includes a die roll 35 and an anvil roll 45. The rotary die cutter 34 includes a positive rotary die cutter 34 for cutting out the positive electrode 13 and a negative rotary die cutter 34 for cutting out the negative electrode 16.

  The axis of the die roll 35 and the axis of the anvil roll 45 extend along the width direction D2 and are parallel to each other. The die roll 35 and the anvil roll 45 are supported by a driving device (not shown) so as to be able to rotate around the axis.

  The die roll 35 includes a cylindrical roll body 36 and a cutting blade 40 having a shape protruding outward in the radial direction of the roll body 36, and the cutting blade 40 moves as the roll body 36 rotates. The cutting blade 40 has a closed ring shape that matches the shape of the planned cutting line 20 a of the positive electrode 13 or the negative electrode 16. The cutting blade 40 includes a pair of first blade portions 41 having a shape extending along the circumferential direction of the roll body 36.

  The cutting blade 40 includes a tab blade portion 42 in the middle of one of the first blade portions 41. The tab blade portion 42 includes a pair of long blades 42 a along the axial direction of the roll body 36 and a short blade 42 b that connects the pair of long blades 42 a along the circumferential direction of the roll body 36. The cutting blade 40 includes a pair of second blade portions 43 having a shape protruding from the circumferential surface along the axial direction of the roll body 36. Each 2nd blade part 43 is extended between the both ends of a pair of 1st blade part 41, and has connected 1st blade part 41 comrades.

  In the positive electrode die roll 35, the length of the first blade portion 41 in the longitudinal direction is the same as the lengths of the first edge 13 a and the second edge 13 b of the positive electrode 13. The length of the second blade portion 43 in the longitudinal direction is the same as the lengths of the third edge 13c and the fourth edge 13d of the positive electrode 13. In addition, the shape of the tab blade portion 42 is the same as the shape of the positive electrode tab 14a.

  In the negative electrode die roll 35, the length of the first blade portion 41 in the longitudinal direction is the same as the lengths of the first edge 16 a and the second edge 16 b of the negative electrode 16. The length of the second blade portion 43 in the longitudinal direction is the same as the lengths of the third edge 16c and the fourth edge 16d of the negative electrode 16. In addition, the shape of the tab blade portion 42 is the same as the shape of the negative electrode tab 17a.

  As shown in FIG. 6 (b) or FIG. 8 (b), when the tip of the cutting blade 40 and the peripheral surface of the anvil roll 45 are closest, the gap between the tip of the cutting blade 40 and the peripheral surface of the anvil roll 45 is shown. There is a clearance, and the tip of the cutting edge 40 does not contact the peripheral surface of the anvil roll 45.

  As shown in FIG. 6A or FIG. 8A, the rotary die cutter 34 includes raised portions 46 at both ends of the anvil roll 45 in the axial direction. The raised portion 46 is formed by sticking a resin band to the peripheral surface of the anvil roll 45. The dimension of the raised portion 46 along the radial direction of the anvil roll 45 is the thickness. In the rotary die cutter 34 for the positive electrode, the thickness of the raised portion 46 is set to be the same as the thickness of the coating portions 22a and 22b of the electrode material 20 for the positive electrode, and in the rotary die cutter 34 for the negative electrode, the thickness of the raised portion 46 is set. Is set equal to the thickness of the coating portions 22a and 22b of the negative electrode material 20.

  The electrode material 20 passes between the die roll 35 and the anvil roll 45 in a state where the second coating part 22 b is supported by the anvil roll 45. At this time, each exposed portion 23 passes between the die roll 35 and the anvil roll 45 while being placed on the raised portion 46. Therefore, even if the exposed portion 23 is located higher than the peripheral surface of the anvil roll 45 due to the thickness of the second coating portion 22 b, the exposed portion 23 is raised from the peripheral surface of the anvil roll 45 by the raised portion 46. Further, in the axial direction of the anvil roll 45, the raised portion 46 is located away from the edge along the longitudinal direction of the second coating portion 22 b, and the second coating is performed along the axial direction of the anvil roll 45. A gap S is formed between the portion 22b and the raised portion 46.

  As shown in FIG. 6B, when the positive electrode material 20 is cut, one first blade portion 41 connected to the tab blade portion 42 faces the gap S. On the other hand, as shown in FIG. 8B, when the negative electrode material 20 is cut, the base end sides of the pair of long blades 42 a in the tab blade portion 42 face each other in the gap S.

  As shown in FIG. 3A, the electrode manufacturing facility 30 includes a cutting mechanism 50 that cuts out the positive electrode 13 or the negative electrode 16 from the electrode material 20. The cutting mechanism 50 includes a cylindrical separation roll 51. The axis of the separation roll 51 extends along the width direction D2. The separation roll 51 is supported by a drive device (not shown) so that it can rotate around its axis.

  The separation roll 51 guides the positive electrode 13 or the negative electrode 16 to be cut out in the transport direction D1 as the first direction. The transport direction D1 coincides with the transport direction D1 of the electrode material 20. On the other hand, the separation roll 51 guides the end material 54, which is the remaining part of the electrode material 20 from which the positive electrode 13 or the negative electrode 16 is separated, in a transport direction D3 as a second direction different from the transport direction D1. In this embodiment, the end material 54 is a portion outside the planned cutting line 20 a and is a portion different from the positive electrode 13 or the negative electrode 16. The electrode manufacturing facility 30 includes a transport device 52 that transports the cut out positive electrode 13 or negative electrode 16 in the transport direction D1.

Next, the manufacturing method of the positive electrode 13 or the negative electrode 16 by the electrode manufacturing facility 30 will be described together with the operation.
When performing the cutting process which cuts the electrode material 20 into the shape of the piece positive electrode 13 or the negative electrode 16, as shown to Fig.6 (a), the positive electrode material 20 is the 2nd coating part 22b. Is supported by the anvil roll 45 and the exposed portion 23 is supported by the raised portion 46 and passes between the die roll 35 and the anvil roll 45. In the cutting step, the electrode material 20 is cut along the shape of the cutting blade 40 while the exposed portion 23 is raised from the peripheral surface of the anvil roll 45 by the raised portion 46.

  As shown by a two-dot chain line in FIG. 7, of the cutting blades 40, one first blade portion 41 and the tab blade portion 42 connected to the tab blade portion 42 are pushed into the exposed portion 23, and the other first blade The part 41 and the pair of second blade parts 43 are pushed into the first coating part 22a.

  At this time, the other first blade portion 41 and the pair of second blade portions 43 penetrate the first coating portion 22a and the strip-shaped current collector foil 21, but do not penetrate the second coating portion 22b. However, as the cutting edge 40 enters, the second coating portion 22b breaks, and the portions along the second edge 13b, the third edge 13c, and the fourth edge 13d of the positive electrode 13 are completely cut.

  Further, as shown in FIG. 6B, one first blade portion 41 connected to the tab blade portion 42 escapes into the gap S while being pressed against the exposed portion 23, and the exposed portion 23 faces the gap S. Cut while pushing. At this time, the thickness of the raised portion 46 is larger than the clearance when the cutting edge 40 is closest to the peripheral surface of the anvil roll 45. For this reason, the exposed portion 23 is raised to the position where the cutting edge 40 reaches by the raised portion 46 while being pushed into the gap S, and a cut 23 a is formed in the exposed portion 23.

  As a result, a portion of the exposed portion 23 that is pushed into the gap S is formed with a cut 23a along the longitudinal direction of the electrode material 20, and is not completely cut. Therefore, as shown in FIG. 7, a notch 23 a is formed in the portion along the first edge 13 a of the positive electrode 13, and an uncut portion 23 b formed only of the metal foil is formed. The non-cut portion 23b is a portion that is thinner than the exposed portion 23 before cutting and is more easily broken than before cutting.

In addition, when the tab blade portion 42 is pressed against the exposed portion 23, the exposed portion 23 is pushed toward the raised portion 46 to completely cut the exposed portion 23.
As a result, as shown by the solid line in FIG. 7, portions of the positive electrode 13 along the positive electrode tab 14 a, the second edge 13 b, the third edge 13 c, and the fourth edge 13 d are completely cut. On the other hand, as shown by a two-dot chain line in FIG. 7, only the portion along the first edge 13a is connected to the electrode material 20 by the non-cutting portion 23b.

  As shown in FIG. 8 (a), the negative electrode material 20 has a die roll 35 in a state where the second coating portion 22b is supported by the anvil roll 45 and the exposed portion 23 is supported by the raised portion 46. And anvil roll 45. In the cutting step, the electrode material 20 is cut along the shape of the cutting blade 40 while the exposed portion 23 is raised from the peripheral surface of the anvil roll 45 by the raised portion 46.

  As shown by a two-dot chain line in FIG. 9, among the cutting blades 40, the base end portion of the long blade 42a of the tab blade portion 42, the pair of first blade portions 41, and the pair of second blade portions 43 are the first. It is pushed into the coating part 22a. At this time, the proximal end portion of the long blade 42a, the pair of first blade portions 41, and the pair of second blade portions 43 penetrate the first coating portion 22a and the strip-shaped current collector foil 21, but the second coating portion 21a. The engineering part 22b does not penetrate. However, as the cutting edge 40 enters, the second coating portion 22b breaks, the base end of the negative electrode tab 17a, the first edge 16a, the second edge 16b, the third edge 16c, and the fourth edge. The part along 16d is completely cut.

  Further, as shown in FIG. 8B, when the tip end portion of the pair of long blades 42 a and the short blade 42 b of the tab blade portion 42 are pressed against the exposed portion 23, the exposed portion 23 is raised to the raised portion 46. The exposed portion 23 is completely cut.

  In addition, a part of the pair of long blades 42 a out of the tab blade portion 42 escapes into the gap S while being pressed against the exposed portion 23, and cuts while pushing the exposed portion 23 toward the gap S. At this time, the thickness of the raised portion 46 is larger than the clearance when the cutting edge 40 is closest to the peripheral surface of the anvil roll 45. For this reason, while the exposed portion 23 is pushed into the gap S, the exposed portion 23 is raised to a position where the cutting edge 40 reaches by the raised portion 46, and a cut 23 a can be formed in the exposed portion 23.

  As a result, a portion of the exposed portion 23 that is pushed into the gap S is slightly cut 23a along the width direction D2 of the electrode material 20, and is not completely cut. For this reason, the uncut part 23b formed only with metal foil is formed in the part along the negative electrode tab 17a.

  As a result, as shown by the solid line in FIG. 9, among the negative electrode 16, the leading end and the base end of the negative electrode tab 17 a, the first edge 16 a, the second edge 16 b, the third edge 16 c and the fourth edge The part along the edge 16d is completely cut. On the other hand, as shown by a two-dot chain line in FIG. 9, a part along the negative electrode tab 17a is connected to the electrode material 20 at the non-cut portion 23b.

  As shown in FIG. 3A, when the downstream end of the positive electrode 13 in the transport direction D1 gets on the transport device 52, the positive electrode 13 is pulled by the transport device 52, and the transport device 52 Change. On the other hand, as shown in FIG. 10, the end material 54 left after the positive electrode 13 is cut out from the electrode material 20 is guided in the transport direction D <b> 3 by the separation roll 51.

  When the end material 54 is guided in the conveyance direction D3 different from the conveyance direction of the positive electrode 13, a load is applied to the non-cutting portion 23b, and as the positive electrode 13 is guided in the conveyance direction D1, the non-cutting portion. 23b tears and the non-cut portion 23b is broken. As a result, the positive electrode 13 and the electrode material 20 are separated, and only the positive electrode 13 is transferred to the transport device 52 and transported.

  Further, when the downstream end of the negative electrode 16 in the transport direction D <b> 1 gets on the transport device 52, the negative electrode 16 is pulled by the transport device 52 and is transferred to the transport device 52. On the other hand, the end material 54 is guided in the transport direction D3 by the separation roll 51. When the end material 54 is guided in the conveyance direction D3 different from the conveyance direction of the negative electrode 16, a load is applied to the non-cutting portion 23b, and as the negative electrode 16 is guided in the conveyance direction D1, the non-cutting portion. 23b is broken. As a result, the negative electrode 16 and the electrode material 20 are separated, and only the negative electrode 16 is transferred to the transport device 52 and transported.

According to the above embodiment, the following effects can be obtained.
(1) A raised portion 46 is provided on the anvil roll 45, and when the electrode material 20 passes between the die roll 35 and the anvil roll 45, the exposed portion 23 is supported by the raised portion 46 so as to be raised from the peripheral surface of the anvil roll 45. I tried to do it. Further, a gap S was made between the second coating portion 22 b supported by the anvil roll 45 and the raised portion 46.

  When the positive electrode 13 is cut out from the electrode material 20, the uncut portion 23 b can be formed in the exposed portion 23 by allowing the first blade portion 41 that presses the exposed portion 23 to escape into the gap S. Further, when cutting the negative electrode 16, the non-cut portion 23 b can be formed in the exposed portion 23 by letting a part of the tab blade portion 42 that pushes the exposed portion 23 into the gap S.

  For this reason, when the positive electrode 13 or the negative electrode 16 is transferred to the transport device 52, the positive electrode 13 or the negative electrode 16 receives a force when the end of the positive electrode 13 or the negative electrode 16 comes into contact with the transport device 52. Can also prevent the posture from fluctuating. Therefore, when the cut positive electrode 13 or the negative electrode 16 is accumulated in the container in the subsequent process of the cutting process, or when stacking is performed in the stacking apparatus, the posture of the positive electrode 13 or the negative electrode 16 needs to be adjusted. In addition, there is no need for a device or process for adjusting the posture.

  (2) When the positive electrode 13 or the negative electrode 16 is cut out from the electrode material 20 by the rotary die cutter 34, the first blade portion 41 is allowed to escape into the gap S, so that the cut portion 23a is formed in the exposed portion 23 and is not cut. The part 23b can be formed. By forming the notch 23a, the thickness of the non-cut portion 23b is thinner than the thickness of the exposed portion 23 before cutting, and the positive electrode 13 or the negative electrode 16 and the end material 54 can be easily separated. .

  (3) When the positive electrode material 20 is cut, an uncut portion 23 b is formed in the exposed portion 23 along the transport direction D <b> 1 of the electrode material 20. For this reason, as the positive electrode 13 is transported in the transport direction D1, the uncut portion 23b is broken while being torn. Therefore, the first edge 13a of the positive electrode 13 can be cut out without generating burrs or the like.

  (4) The part cut out as the positive electrode 13 or the negative electrode 16 and the other part (end material 54) are connected only by the uncut part 23b of the exposed part 23. And if the positive electrode 13 or the negative electrode 16 transfers to the conveyance apparatus 52, since the guide direction of the positive electrode 13 or the negative electrode 16 and the end material 54 differs, a load is provided to the non-cut | disconnecting part 23b. Due to this load, the non-cut portion 23b is broken. For this reason, the positive electrode 13 or the negative electrode 16 and the end material 54 can be easily separated with a simple configuration.

  (5) The thickness of the raised portion 46 is larger than the clearance when the cutting edge 40 is closest to the peripheral surface of the anvil roll 45. For this reason, the exposed part 23 can be raised to the position where the cutting blade 40 reaches by the raised part 46, and the notch 23a and the non-cut part 23b can be formed.

  (6) The raised portion 46 is affixed in advance over the entire circumferential direction of the anvil roll 45. For this reason, the exposed portion 23 can be raised at any location in the circumferential direction of the anvil roll 45.

  (7) When cutting the negative electrode 16, the non-cut portion 23 b is formed to be short along the width direction D <b> 2 of the electrode material 20. Unlike the positive electrode 13, the negative electrode 16 has no uncoated portion. For this reason, the part cut out from the exposed part 23 is only a part along the negative electrode tab 17a, and becomes a part along the width direction D2 of the electrode material 20. When the negative electrode 16 is transferred to the transport device 52, the portion along the width direction D2 is not easily broken. Therefore, the negative electrode 16 can be easily separated from the end material 54 by shortening the non-cut portion 23b.

(8) The non-cut portion 23 b is formed on the strip-shaped current collector foil 21. For this reason, even if the non-cut portion 23b is broken, foreign substances such as active material particles are not generated.
(9) The non-cut portion 23b is formed in the exposed portion 23 and not formed in the second coating portion 22b. In order to form the non-cutting part 23b in the second coating part 22b, it is necessary to prevent the second coating part 22b from cracking when the cutting blade 40 enters, and the thickness of the non-cutting part 23b increases. Cheap. Then, when the non-cut portion 23b is broken, foreign substances such as active material particles are easily generated. Therefore, it is preferable to form the uncut portion 23 b in the exposed portion 23.

  (10) Even the exposed portion 23 located higher than the peripheral surface of the anvil roll 45 by the thickness of the second coating portion 22 b is raised by the raising portion 46. For this reason, the exposed portion 23 is prevented from dripping, and the exposed portion 23 is easily cut. Then, when the exposed portion 23 is raised by the raised portion 46, the gap S is formed, so that the non-cut portion 23b is formed at a position corresponding to the gap S in the exposed portion 23. The electrode 13 or the negative electrode 16 can be positioned.

In addition, you may change the said embodiment as follows.
O Although the raised portion 46 was formed by pasting a resin band on the peripheral surface of the anvil roll 45, the raised portion 46 may be separated from the anvil roll 45.

  As shown in FIG. 11, the peripheral portion of the anvil roll 45 is passed in a state where the resin tape 47 as the raised portion is pressed against the exposed portion 23, and the exposed portion 23 is raised from the peripheral surface of the anvil roll 45. Also good. In this case, the electrode manufacturing facility 30 includes a supply roller 48 that sends out the resin tape 47 and a take-up roller 49 that winds up the sent resin tape 47. Further, the electrode manufacturing facility 30 includes a nip roller 55 that presses the resin tape 47 against the exposed portion 23 on the upstream side of the rotary die cutter 34.

  Then, the resin tape 47 may be passed between the die roll 35 and the anvil roll 45 in a state where the resin tape 47 is pressed against the exposed portion 23, and the exposed portion 23 may be raised by the resin tape 47.

O Although the raised portion 46 was formed by pasting a resin band on the peripheral surface of the anvil roll 45, the raised portion 46 may be separated from the anvil roll 45.
As shown in FIG. 12, a supply roller 56 is arranged in a state parallel to the axis of the anvil roll 45, and an endless belt 57 is wound around the supply roller 56 and the anvil roll 45. The endless belt 57 is made of resin and is used as a raised portion. Then, the supply roller 56 is rotated in the same direction as the anvil roll 45 by a driving device (not shown), and the endless belt 57 is rotated in synchronization with the anvil roll 45. Then, the exposed portion 23 is raised by the endless belt 57.

O The raising part may be provided by increasing the diameter of both ends of the anvil roll 45 in the axial direction.
The thickness of the raised portion 46 may be appropriately changed as long as the cutting edge 40 is larger than the clearance when the cutting edge 40 is closest to the peripheral surface of the anvil roll 45. For example, the thickness of the raised portion 46 is the second coating. It may be thinner than the thickness of the portion 22b.

  As shown in FIG. 13, when the negative electrode 16 is cut from the negative electrode material 20, an uncut portion 23b having a shape protruding from the first edge 16a is formed, and the first edge 16a of the negative electrode 16 You may make it connect the exposed part 23 with the non-cut | disconnecting part 23b.

  In the embodiment, in the electrode material 20, the non-cut portion 23 b is formed while forming the cut 23 a at a position corresponding to the gap S, but this is not a limitation. When the 1st blade part 41 which pushes the exposed part 23 is escaped to the clearance gap S, the notch 23a may not be formed in the exposed part 23, but the uncut part 23b may be formed with the exposed part 23 itself which is not cut.

If the conveyance direction of each electrode 13 and 16 in the separation roll 51 and the conveyance direction of the end material 54 differ from each other, the conveyance direction of the end material 54 may differ from the embodiment.
The cut 23a is formed by cutting the first coating portion 22a completely, but the strip-shaped current collector foil 21 is not completely cut, and the non-cut portion 23b is formed by the strip-shaped current collector foil 21 and the second coated portion. 22b may be formed.

O The non-cut portion 23b may be broken by a method different from that of the separation roll 51. For example, a method of breaking the non-cut portion 23b with ultrasonic waves may be employed.
In the rotary die cutter 34, one positive electrode 13 or negative electrode 16 is cut in the width direction D2 of the electrode material 20. However, the present invention is not limited to this. The strip-shaped current collector foil 21 and the coating portions 22a and 22b of the electrode material 20 are expanded in the width direction D2. At this time, an exposed portion along the longitudinal direction of the electrode material 20 is formed between the coating portions adjacent in the width direction D2. And the clearance gap S may be matched with the exposed part between adjacent coating parts, and you may make it form the non-cut | disconnecting part 23b using the clearance gap S. FIG. In this case, two or more cutting edges 40 are arranged in the width direction D2 so that two or more positive electrodes 13 or negative electrodes 16 can be cut in the width direction D2.

  The electrode material 20 may be configured to have a coating portion only on one side of the strip-shaped current collector foil 21. In this case, the electrode material 20 is passed through the rotary die cutter 34 in a state where the coating portion is supported by the peripheral surface of the anvil roll 45. In this case, the positive electrode 13 includes a positive electrode active material layer 15 on one surface of the positive electrode current collector foil 14, and the negative electrode 16 includes a negative electrode active material layer 18 on one surface of the negative electrode current collector foil 17.

○ It can also be applied to power storage devices other than secondary batteries, such as capacitors.
Next, the technical idea that can be grasped from the above embodiment and other examples will be described below.
(1) The above-mentioned raising part is a rotary die cutter which is a resin sheet affixed on the peripheral surface of the anvil roll.

  S ... Gap, 13 ... Positive electrode as electrode, 16 ... Negative electrode as electrode, 20 ... Electrode material, 21 ... Strip current collector foil, 22a ... First coating part, 22b ... Second coating part, 23 ... Exposed part, 23a ... Notch, 23b ... Uncut part, 34 ... Rotary die cutter, 35 ... Die roll, 40 ... Cutting blade, 45 ... Anvil roll, 46 ... Raised part.

Claims (5)

A coated portion formed on the surface of the strip-shaped current collector foil; and an exposed portion adjacent to the coated portion and present along the longitudinal direction of the strip-shaped current collector foil and exposed of the strip-shaped current collector foil. An electrode manufacturing method comprising a cutting step of cutting an electrode material into the shape of an individual electrode,
The cutting step is performed by a rotary die cutter including a die roll having a cutting edge on a peripheral surface, and an anvil roll disposed to face the peripheral surface of the die roll.
When passing between the die roll and the anvil roll while conveying the electrode material,
While raising the exposed portion from the peripheral surface of the anvil roll by the raised portion, cutting the electrode material along the shape of the cutting blade,
A non-cut portion is formed in an exposed portion corresponding to the gap by a gap formed between the coating portion and the raised portion.   2. The method for manufacturing an electrode according to claim 1, wherein in the process of cutting the electrode material, the cutting edge is pressed against the uncut portion to form a cut in the exposed portion.   The method of manufacturing an electrode according to claim 2, wherein the cut is formed by cutting the exposed portion with a part of a cutting blade extending along a conveying direction of the electrode material.   A step of breaking the non-cut portion, and in the step of breaking, the portion of the electrode material cut out as the electrode is guided in a first direction which is a transport direction of the electrode material, The method for manufacturing an electrode according to any one of claims 1 to 3, wherein a portion different from the cut-out portion is guided in a direction different from the first direction. A coated portion formed on the surface of the strip-shaped current collector foil; and an exposed portion adjacent to the coated portion and present along the longitudinal direction of the strip-shaped current collector foil and exposed of the strip-shaped current collector foil. A rotary die cutter that cuts an electrode material into the shape of an individual electrode,
Including a die roll having a cutting edge on the peripheral surface, and an anvil roll disposed to face the peripheral surface of the die roll,
Of the electrode material passing between the die roll and the anvil roll, and having a raised portion that raises the exposed portion from the peripheral surface of the anvil roll,
Having a gap existing between the coating part and the raised part,
A rotary die cutter, wherein a part of the cutting blade is disposed corresponding to the gap.

Images