JP2017224568A - Electrode manufacturing facility - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrode manufacturing facility capable of stably breaking a non-cut portion when passing through a separation roller.SOLUTION: A guide device 50 of an electrode manufacturing facility comprises a separation roller 51 around which an end member 54 is wound so as to guide the end member 54 in a conveying direction D3 while guiding a portion cut out as a positive electrode 13 in a conveying direction D1. The separation roller 51 includes a first support portion 55 for supporting an exposed portion 23 of the end member 54 and a second support portion 56 for supporting a coated portion 22.SELECTED DRAWING: Figure 8

Description

  The present invention includes a cutting device that cuts an electrode material into the shape of an individual electrode, and a guide device that guides a portion cut out as an electrode in a first direction while guiding an end material in a second direction. The present invention relates to an electrode manufacturing facility.

  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. In addition, an electrode material is provided with the coating part formed by apply | coating an active material mixture to strip | belt-shaped metal foil. Then, by passing the electrode material through the rotary die cutter, the electrode is cut from the electrode material. The electrode material from which the electrode has been cut is wound around a separation roller to separate the electrode from the end material that is the remaining part of the electrode material.

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.

  Therefore, when cutting out individual electrodes from the electrode material, it is conceivable that a part of the electrode is kept connected to a portion serving as an end material to suppress variations in the posture of the electrode. In order to connect the electrode and the end material, it is conceivable that when the individual electrode is cut out from the electrode material, a part along the shape of the electrode is not completely cut, but the other part is completely cut. .

  By the way, as an electrode material, it is provided with a coating portion formed by applying an active material mixture to a strip-shaped metal foil as described above, and the exposed metal foil is exposed on a portion where no active material mixture is applied. Some have parts. When this electrode material is used, an active material layer of the electrode is formed from the coated part, and an uncoated part such as an electrode tab is formed from the exposed part.

  In such an electrode material, the coated portion is easily broken when a blade is inserted for cutting, and it is difficult to form a non-cut portion. Therefore, it is conceivable that the non-cut portion is formed in the exposed portion. Then, as in Patent Document 1, when the end material is wound around the separation roller and the end material is conveyed in a direction different from the conveyance direction of the electrode, the uncut portion is broken and separated into the electrode and the end material. .

  However, when the end material passes through the separation roller, if the non-cutting part is in the coating part, it is wound around the separation roller with tension applied to the coating part, and it is cut off well, while it is not cut. When the portion is in the exposed portion, the periphery of the uncut portion is lifted from the separation roller, and no tension is applied to the exposed portion. As a result, when the end material passes through the separation roller, there is a possibility that slack occurs around the non-cut portion, and there is a possibility that the breakage may not be performed in a good state due to the slack. There may be wrinkles.

  An object of the present invention is to provide an electrode manufacturing facility capable of stably breaking a non-cut portion when passing a separation roller.

  An electrode manufacturing facility for solving the above-mentioned problems exists in a coating part formed on the surface of the strip-shaped current collector foil, adjacent to the coating section, and along the longitudinal direction of the strip-shaped current collector foil. A cutting device that cuts an electrode material having an exposed portion of the strip-shaped current collector foil into the shape of an individual electrode, and one of the electrode materials that guides a portion cut out as the electrode in a first direction An electrode manufacturing facility comprising a guide device that guides an end material, which is a portion different from the portion cut out as the electrode, in a second direction different from the first direction, wherein the cutting device includes: The electrode material is cut in a state where a portion cut out as an electrode and the end material are connected by a non-cutting portion, and the guide device is wound around the end material to guide the end material in the second direction. A separating roller, wherein the separating roller is A first support portion for supporting the exposed portion of said end member, and summarized in that and a second support portion for supporting the coating section.

  According to this, in the guide device, when the end material passes through the separation roller, the exposed portion of the end material raised by the coating portion contacts the first support portion, and the exposed portion of the end material is first supported. It can be directly supported by the part. At the same time, the coating part can be supported by the second support part. Therefore, the exposed portion of the end material passes through the separation roller while being supported by the first support portion, and the periphery of the non-cutting portion does not float from the separation roller, and tension is applied around the non-cutting portion. Can be wound in the state. For this reason, when the circumference | surroundings of a non-cutting part pass a separation roller, it can suppress that slack generate | occur | produces around the non-cutting part, and can break a non-cutting part stably.

  In the electrode manufacturing facility, the guide device may include a guide roller downstream of the separation roller in the second direction, and the guide roller may include the first support portion and the second support portion.

  According to this, the end material that has passed the separation roller is guided so as to be conveyed in the second direction by the guide roller. For this reason, even if the end material has a coating part and an exposed part, when the end material passes through the guide roller, the first support part of the guide roller contacts the end material and the exposed part, like the separation roller. Can be directly supported by the first support portion. Therefore, the end material does not float from the guide roller, and the end material can be wound in a tensioned state. For this reason, when the end material passes through the guide roller, it is possible to suppress the occurrence of slack in the end material.

In the electrode manufacturing facility, the cutting device forms the non-cut portion in the exposed portion.
According to this, when guiding the end material in the second direction while guiding the portion to be cut out as an electrode by the separation roller, a load is applied to the non-cut portion because the guide direction is different, By this load, the non-cut portion is broken. Even when the end material passes through the separation roller, even if it is a non-cut portion formed in the exposed portion, the non-cut portion can be stably broken, so that generation of wrinkles around the non-cut portion can be suppressed.

  In the electrode manufacturing facility, the separation roller is a stepped roller having a different diameter, and includes the first support portion at a large diameter portion, and the second support portion at a smaller diameter portion than the first support portion. Prepare.

According to this, the diameter of a 1st support part cannot change easily with time, and can support the exposed part in an end material in the stable state.
Moreover, about an electrode manufacturing equipment, the said 1st support part may be formed of the raising member provided in the surrounding surface of the roller main body.

According to this, although the height of the exposed portion varies depending on the type of thickness of the coating portion, the exposed portion is supported in a stable state by the first support portion by matching the thickness of the raising member to the thickness of the coating portion. it can.
In the electrode manufacturing facility, the raising member may be a sheet-like member attached to the peripheral surface of the roller body.

  According to this, a 1st support part can be provided easily.

  According to the present invention, the non-cut portion can be stably broken when passing through the separation roller.

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. The top view which shows the state which cut | disconnected the electrode material of the positive electrode. The top view which shows the state which cut | disconnected the electrode material of the negative electrode. The perspective view which shows the state which cut out the positive electrode. Sectional drawing which shows the separation roller of the state by which the end material was wound. Sectional drawing which shows a guide roller. Sectional drawing which shows the separation roller of the state by which the end material was wound. Sectional drawing which shows another example of a separation roller. The side view which shows typically the electrode manufacturing equipment of another example. (A) is a top view which shows the cutting planned line of another example, (b) is sectional drawing which shows the separation roller of the state by which the end material was wound.

Hereinafter, an embodiment of an electrode manufacturing facility 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 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 includes a strip-shaped current collector foil 21 and a coating portion 22 that exists on both surfaces of the strip-shaped current collector foil 21. 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 part 22 is a part that becomes the positive electrode active material layer 15. In the electrode material 20 for the negative electrode 16, the coating part 22 is the negative electrode active material layer 18. It is a part to become.

  The coating part 22 is formed by applying a paste-like active material mixture in which an active material, a conductive agent, a solvent and a binder are mixed to the surface of the strip-shaped current collector foil 21, drying, and then pressurizing. The coating part 22 extends in a band shape with a certain width along the longitudinal direction of the electrode material 20. 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 portion 22 does 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 coating portion 22 in the width direction D2 of the electrode material 20. In the present embodiment, one exposed portion 23, the coating portion 22, and the other exposed portion 23 are arranged along the width direction D <b> 2 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).

  The electrode manufacturing facility 30 includes a rotary die cutter 34 as a cutting device. 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 planned cutting line 20a along the edge 13a extends in the transport direction D1, and the planned cutting line 20a along 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 portion 22, and the width direction D2 of the electrode material 20 is set. It extends to. Of the planned cutting line 20a, a portion corresponding to the second edge 13b of the positive electrode 13 is set on the coating part 22 and extends in the transport direction D1 of the electrode material 20.

  As shown in FIG. 5 (b), the portion corresponding to the first edge 16 a of the negative electrode 16 and the base end side of the negative electrode tab 17 a of the planned cutting line 20 a of the negative electrode 16 is on the coating portion 22. Is set. 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 part 22 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 part 22, and is extended in the conveyance direction D1 of the electrode material 20. As shown in 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.

  In the state where the tip of the cutting blade 40 and the peripheral surface of the anvil roll 45 are closest, there is a clearance between the tip of the cutting blade 40 and the peripheral surface of the anvil roll 45, and the tip of the cutting blade 40 is located at the anvil roll 45. Do not touch the surrounding surface.

  The rotary die cutter 34 includes raised portions 46 at both axial ends of the anvil roll 45. 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 portion 22 of the electrode material 20 for the positive electrode. In the rotary die cutter 34 for the negative electrode, the thickness of the raised portion 46 is The thickness is set to be the same as the thickness of the coating portion 22 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 one coating part 22 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 coating portion 22, the exposed portion 23 is raised from the peripheral surface of the anvil roll 45 by the raised portion 46. Further, as shown in FIG. 5A or 5B, 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 coating portion 22, and the anvil roll 45 A gap S is formed between the coating portion 22 and the raised portion 46 along the axial direction.

  As shown in FIG. 3A, the electrode manufacturing facility 30 includes a guide device 50. The guide device 50 guides the end material 54, which is a part different from the part cut out as the positive electrode 13 or the negative electrode 16, while guiding the positive electrode 13 or the negative electrode 16 in the transport direction D1 as the first direction. Guide in the transport direction D3 as a second direction different from the one direction.

  The guide device 50 includes a columnar separation roller 51, a guide roller 52, and a take-up reel 53. The axis of the separation roller 51 and the guide roller 52 extends along the width direction D2. The separation roller 51 is supported by a driving device (not shown) so as to be able to rotate around an axis, and the guide roller 52 is supported by a driving device (not shown) so as to be able to rotate around an axis. Further, the take-up reel 53 is supported by a drive device (not shown) so as to be able to rotate around the axis.

  The separation roller 51 guides the positive electrode 13 or the negative electrode 16 to be cut out in the transport direction D1. The transport direction D1 coincides with the transport direction D1 of the electrode material 20. On the other hand, the separation roller 51 and the guide roller 52 guide the end material 54 from which the positive electrode 13 or the negative electrode 16 is separated in the transport direction D3. Further, the guide roller 52 applies tension to the end material 54 guided in the transport direction D3. The take-up reel 53 takes up the end material 54 guided in the transport direction D3.

  As shown in FIGS. 5A and 5B, 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. In the end material 54, a part on one end side in the width direction D2 of the electrode material 20 is defined as a first part 54a, and a part on the other end side in the width direction D2 is defined as a second part 54b.

  As shown in FIG. 5A, when the positive electrode 13 is cut, the first portion 54 a of the end material 54 includes only the exposed portion 23, and the second portion 54 b includes the coating portion 22 and the exposed portion 23. 5B, when the negative electrode 16 is cut, the first portion 54a of the end material 54 includes the coating portion 22 and the exposed portion 23, and the second portion 54b is also connected to the coating portion 22. An exposed portion 23 is included.

  As shown in FIG. 9 or FIG. 10, the separation roller 51 and the guide roller 52 are stepped rollers having different diameters in the axial direction. The separation roller 51 and the guide roller 52 include first support portions 55 that are large-diameter portions at both end portions in the axial direction. In addition, the separation roller 51 and the guide roller 52 include a second support portion 56 that is smaller in diameter than the first support portion 55 at a portion sandwiched between both first support portions 55. The first support portion 55 has a larger diameter than the second support portion 56. The difference between the diameter of the first support part 55 and the diameter of the second support part 56 is the same as or substantially the same as the thickness of the coating part 22.

  The dimension of the second support part 56 along the axial direction of the separation roller 51 and the guide roller 52 is longer than the dimension of the coating part 22 along the width direction D2 of the electrode material 20. The coating part 22 is supported by the second support part 56. Further, the exposed portion 23 that is raised by the coating portion 22 and is higher than the peripheral surface of the second support portion 56 is supported by the first support portion 55.

The electrode manufacturing facility 30 includes a transport device 57 that transports the cut out positive electrode 13 or negative electrode 16 in the transport direction D1.
Next, a method for manufacturing the positive electrode 13 or the negative electrode 16 by the electrode manufacturing facility 30 will be described.

  When the electrode material 20 supplied from the supply unit 31 is cut into the shape of the individual positive electrode 13 or negative electrode 16, the lower electrode coating unit 22 is supported by the anvil roll 45 on the positive electrode material 20. The

  At the same time, as shown in FIG. 5A or FIG. 5B, the exposed portion 23 passes between the die roll 35 and the anvil roll 45 while being supported by the raised portion 46. The electrode material 20 is cut along the shape of the cutting edge 40 while raising the exposed portion 23 from the peripheral surface of the anvil roll 45 by the raised portion 46.

  As shown in FIG. 5A or 6, in the positive electrode material 20, of the cutting blade 40, one of the first blade portion 41 and the tab blade portion 42 connected to the tab blade portion 42 is the exposed portion 23. The other first blade part 41 and the pair of second blade parts 43 are pushed into the coating part 22. At this time, the other first blade portion 41 and the pair of second blade portions 43 penetrate the upper coating portion and the strip-shaped current collector foil 21, but do not penetrate the lower coating portion 22. However, as the cutting edge 40 enters, the lower coating portion 22 is broken, 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.

  One of the first blade parts 41 connected to the tab blade part 42 escapes into the gap S between the raising member 61 and the coating part 22 while being pressed against the exposed part 23, and the exposed part 23 faces the gap S. Press and cut. 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, in the portion along the first edge 13a of the positive electrode 13, a cut 23a is formed, and an uncut portion 23b formed of only 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. 6, the portions along the positive electrode tab 14a, the second edge 13b, the third edge 13c, and the fourth edge 13d of the positive electrode 13 are completely cut. On the other hand, as shown by the two-dot chain line in FIG. 6, 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. 5 (b), the electrode material 20 of the negative electrode has the die roll 35 and the anvil roll 45 in a state where the coating part is supported by the anvil roll 45 and the exposed part 23 is supported by the raised part 46. Pass between. The electrode material 20 is cut along the shape of the cutting edge 40 while raising the exposed portion 23 from the peripheral surface of the anvil roll 45 by the raised portion 46.

  Of the cutting blade 40, the base end portion of the long blade 42 a of the tab blade portion 42, the pair of first blade portions 41, and the pair of second blade portions 43 are pushed into the upper coating portion 22. At this time, the base end portion of the long blade 42a, the pair of first blade portions 41 and the pair of second blade portions 43 penetrate the upper coating portion 22 and the strip-shaped current collector foil 21, but the lower coating portion The part 22 does not penetrate. However, as the cutting edge 40 enters, the lower coating portion 22 is cracked, 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, of the tab blade portion 42, when the tip portion of the pair of long blades 42a and the short blade 42b are pressed against the exposed portion 23, the exposed portion 23 is pushed toward the raised portion 46, and the exposed portion 23 is entirely moved. Disconnect. 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.

  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 shown by the solid line in FIG. 7, the negative electrode 16 includes a distal end portion and a proximal end portion of the negative electrode tab 17 a, a first edge 16 a, a second edge 16 b, a third edge 16 c, and a fourth edge 16 d. The part along is cut off. On the other hand, as shown by a two-dot chain line in FIG. 7, a part along the negative electrode tab 17a is connected to the electrode material 20 at the non-cut portion 23b.

  3A, the positive electrode 13 or the negative electrode 16 is placed on the transport device 57 when the downstream end in the transport direction D1 is on the transport device 57. Pulled and transferred to the transfer device 57. On the other hand, the end material 54 left after the positive electrode 13 or the negative electrode 16 is cut out from the electrode material 20 is guided in the transport direction D3 by the separation roller 51 and the guide roller 52.

  As shown in FIG. 9 or FIG. 10, when the positive electrode 13 is cut out, one first support portion 55 comes into contact with the first portion 54a on the one long edge portion E1 side including only the exposed portion 23. The first portion 54 a is directly supported by the first support portion 55. For this reason, even if the end portion 54 is the first portion 54 a including only the exposed portion 23, it is in contact with the separation roller 51 and the guide roller 52 and is wound around the separation roller 51 and the guide roller 52 while being directly supported. It is done.

  Further, in the second portion 54b on the other long edge portion E2 side including the exposed portion 23 and the coating portion 22, the other first support portion 55 comes into contact with the exposed portion 23, and the coating portion 22 2 directly supported by the support 56. Thereafter, the end material 54 is taken up on the take-up reel 53.

  As shown in FIG. 11, when the negative electrode 16 is cut out, the first part 54a including the exposed part 23 and the coating part 22 and the second part 54b including the exposed part 23 and the coating part 22 are separated from each other. 51 is in contact with 51 and the guide roller 52 and is wound around the separation roller 51 and the guide roller 52 while being directly supported.

  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 end material 54 are separated.

  Further, when the end material 54 is guided in the transport direction D3 that is different from the transport direction of the negative electrode 16, a load is applied to the non-cutting portion 23b, and the non-cutting portion 54 becomes non-conductive as the negative electrode 16 is guided in the transport direction D1. The cutting part 23b is broken. As a result, the negative electrode 16 and the electrode material 20 are separated.

According to the above embodiment, the following operational effects can be obtained.
(1) When the positive electrode 13 is cut from the electrode material 20 and the end material 54 is wound around the separation roller 51 and the guide roller 52 and conveyed, the first support portion 55 is brought into contact with the first portion 54a of the exposed portion 23 only. Can be made. For this reason, it is possible to directly support the first portion 54a in a state where it is in contact with the separation roller 51. Therefore, when the first part 54a passes the separation roller 51, tension is applied to the first part 54a, and the exposed portion 23 of the first part 54a is prevented from being loosened, and the uncut portion 23b is stabilized. Can be broken.

  Therefore, when the non-cutting portion 23b is broken, it is possible to prevent wrinkles from occurring in the first portion 54a around the non-cutting portion 23b. As a result, it is possible to suppress the first portion 54a from being cut due to wrinkles. Moreover, when the positive electrode 13 or the negative electrode 16 is separated from the end material 54 due to wrinkles generated in the first portion 54a, it is possible to suppress the posture of the positive electrode 13 or the negative electrode 16 from being shifted. . In addition, the occurrence of wrinkles on the positive electrode tab 14a and the negative electrode tab 17a cut out from the exposed portion 23 can be suppressed.

  (2) The first support portion 55 is provided at the end portion of the guide roller 52 in the axial direction. Then, after cutting the positive electrode 13 from the electrode material 20, when the end material 54 is wound around the guide roller 52 and conveyed, the first support portion 55 can be brought into contact with the first portion 54 a including only the exposed portion 23. it can. For this reason, even if it is the 1st site | part 54a only of the exposed part 23, it can support in the state made to contact the guide roller 52 directly. For this reason, when the 1st site | part 54a passes the guide roller 52, the tension | tensile_strength has acted on the 1st site | part 54a, it suppresses that the exposed part 23 of the end material 54 loosens, and a wrinkle arises due to the slackness. This can be suppressed.

  (3) When the rotary die cutter 34 cuts the positive electrode material 20, the uncut portion 23b is formed in the exposed portion 23 along the transport direction D1 of the electrode material 20. Then, as the positive electrode 13 is transported in the transport direction D1 and the end material 54 is transported in the transport direction D3 by the separation roller 51, a load acts on the non-cutting portion 23b, and the non-cutting portion 23b It breaks while tearing. When the end material 54 passes through the separation roller 51, it is possible to suppress the generation of wrinkles in the exposed portion 23 of the end material 54, thereby suppressing the load from being hardly applied to the non-cut portion 23 b due to the wrinkles. As a result, the uncut portion 23b can be prevented from being broken.

  (4) The first support portion 55 is a stepped roller in which both end portions in the axial direction of the separation roller 51 have a large diameter. For this reason, the diameter of the 1st support part 55 cannot change easily with time, and can contact the 1st support part 55 with respect to the exposed part 23 stably.

In addition, you may change the said embodiment as follows.
The configuration including the first support portion 55 and the second support portion 56 may be only the separation roller 51, and the guide roller 52 does not include the first support portion 55 and has a configuration with a constant diameter along the axial direction. May be.

The diameters of the separation roller 51 and the guide roller 52 are made different in the axial direction to form the first support part 55 and the second support part 56, but the method of making the diameters different is not limited to this.
For example, as shown in FIG. 12, the separation roller 51 and the guide roller 52 include a roller body 60 having a constant diameter in the axial direction, and a raising member 61 that is a sheet-like member at both ends of the roller body 60 in the axial direction. To expand the diameter. Then, a first support portion 55 that is a large-diameter portion is formed on the portion to which the raising member 61 is attached, and a second support portion 56 that is a smaller-diameter portion than the first support portion 55 is formed on the roller main body 60 portion. .

  When configured in this way, the exposed portion 23 is attached to the first support portion 55 even if the thickness of the coating portion 22 changes by sticking the raising member 61 that matches the thickness of the coating portion 22 to the roller body 60. Can be supported.

The diameters of the separation roller 51 and the guide roller 52 are made different in the axial direction to form the first support part 55 and the second support part 56, but the method of making the diameters different is not limited to this.
For example, as shown in FIG. 13, the separation roller 51 includes a roller body 60 having a constant diameter in the axial direction. A supply roller 62 is arranged in parallel with the roller body 60, and an endless belt 63 is wound around the supply roller 62 and the roller body 60. The endless belt 63 is made of resin and is used as a raising member. Then, the supply roller 62 is rotated in the same direction as the roller body 60 by a driving device (not shown), and the endless belt 63 is rotated in synchronization with the roller body 60. Then, the diameter of the roller body 60 is increased by the endless belt 63. Then, the first support portion 55 is formed in the endless belt 63 portion, and the second support portion 56 is formed in the roller body 60 portion.

  In the rotary die cutter 34 of the embodiment, the single positive electrode 13 or the negative electrode 16 is cut out in the width direction D2 of the electrode material 20, but the present invention is not limited to this, and two pieces in the width direction D2 of the electrode material 20 The positive electrode 13 or the negative electrode 16 may be cut out.

  As shown to Fig.14 (a), the strip | belt-shaped collector foil 21 and the coating part 22 are expanded to the width direction D2. In FIG. 14A and FIG. 14B, the electrode material 20 for the positive electrode 13 is illustrated. Further, the cutting edge 40 is expanded in the width direction D2 so that the two positive electrodes 13 or the negative electrodes 16 can be cut in the width direction D2 of the electrode material 20. The cutting blade 40 includes a first blade portion 41 that is not connected to the tab blade portion 42 in common, and two positive electrodes 13 or negative electrodes in the width direction D2 with respect to the common first blade portion 41. It becomes the shape where the 2nd blade part 43 for cut | disconnecting the electrode 16 is connected. Further, tab blade portions 42 are connected to the first blade portions 41 located on both sides in the width direction D2. The positions of the tab blade portions 42 on both sides in the width direction D <b> 2 are shifted in the circumferential direction of the die roll 35.

  Then, in order to cut out the two positive electrodes 13 or the negative electrodes 16 in the width direction D2 of the electrode material 20, the position of the electrode material 20 that bisects in the width direction D2 in the coating portion 22 is in the tab blade portion 42. All are cut by the common 1st blade part 41 which is not connected. Moreover, in order to cut out the positive electrode 13 or the negative electrode 16 continuously in the longitudinal direction of the electrode material 20, the electrode material 20 is completely cut between the adjacent positive electrodes 13 or between the negative electrodes 16 by the second blade portion 43. Is done.

  As shown in FIG. 14 (b), the first support portion 55 of the separation roller 51 supports the exposed portions 23 on both sides in the width direction D2, and the uncut portions along the first edges 13a and 16a on the exposed portions 23. 23b is formed. On the other hand, portions along the second edges 13b and 16b, the third edges 13c and 16c, and the fourth edges 13d and 16d are completely cut.

  In this embodiment, the first part 54 a and the second part 54 b of the end material 54 are each formed by only the exposed portion 23. When the end material 54 is wound around the separation roller 51 and conveyed, the first support portion 55 can be brought into contact with the first portion 54a and the second portion 54b of only the exposed portion 23. For this reason, the first part 54 a and the second part 54 b can be directly supported in a state where they are in contact with the separation roller 51. Therefore, when the first part 54a and the second part 54b pass the separation roller 51, tension is applied to the first part 54a and the second part 54b, and exposed portions of the first part 54a and the second part 54b. 23 can be prevented from loosening, and the non-cut portion 23b can be stably broken.

  Therefore, even when the two positive electrodes 13 or the negative electrodes 16 are cut in the width direction D2 of the electrode material 20, wrinkles are generated around the non-cut portion 23b when the non-cut portion 23b is broken. This can be suppressed.

  In the embodiment, the positive electrode 13 or the negative electrode 16 is cut out at intervals in the longitudinal direction of the electrode material 20, but the positive electrode 13 or the negative electrode 16 may be cut out continuously in the longitudinal direction of the electrode material 20. . In this case, as for the electrode material 20, the part between adjacent positive electrode 13 or negative electrodes 16 is completely cut | disconnected.

  In the rotary die cutter 34 of the embodiment, the single positive electrode 13 or the negative electrode 16 is cut in the width direction D2 of the electrode material 20, but the present invention is not limited to this. The strip-shaped current collector foil 21 and the coating part 22 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. 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.

  In the embodiment, the non-cut portion 23b is a portion where the cut portion 23a is formed in the exposed portion 23 to reduce the thickness of the metal foil, but is not limited thereto. The cut portion 23a may not be formed in the exposed portion 23, and the uncut portion 23b may be formed by the uncut portion 23 itself.

  If the conveyance direction D1 of each electrode 13 and 16 in the separation roller 51 and the conveyance direction D3 of the end material 54 are different from each other, the conveyance direction D3 of the end material 54 may be different from the embodiment.

Although the rotary die cutter 34 is embodied as a cutting device that cuts into the shape of an electrode while forming the non-cutting portion 23b, the cutting device may be changed to a laser irradiation device.
The uncut portion 23 b is formed in the exposed portion 23 of the electrode material 20, but may be formed in the coating portion 22.

  The cut 23 a is formed by cutting one coating part 22 completely, but the strip-shaped current collector foil 21 is not completely cut, and the non-cut part 23 b is formed by the strip-shaped current collector foil 21 and the other coating part 22. It may be formed.

O The non-cut portion 23b may be broken by a method different from that of the separation roller 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 part 22 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. 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 positive electrode 13 includes the positive electrode active material layer 15 on one surface of the positive electrode current collector foil 14, and the negative electrode 16 includes the 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.

  D1 ... transport direction as the first direction, D3 ... transport direction as the second direction, 13 ... positive electrode as the electrode, 16 ... negative electrode as the electrode, 20 ... electrode material, 21 ... strip current collector foil, 22 ... Coating part, 23 ... exposed part, 23b ... non-cutting part, 30 ... electrode manufacturing equipment, 34 ... rotary die cutter as cutting device, 50 ... guide device, 51 ... separating roller, 52 ... guide roller, 54 ... end material 55 ... 1st support part, 56 ... 2nd support part, 60 ... Roller main body, 61 ... Raising member.

Claims (6)

A coated portion formed on the surface of the strip-shaped current collector foil, and an exposed portion adjacent to the coated portion and exposed along the longitudinal direction of the strip-shaped current collector foil and exposed of the strip-shaped current collector foil. A cutting device for cutting the electrode material comprising into the shape of an individual electrode;
Of the electrode material, the portion cut out as the electrode is guided in the first direction, while the end material that is different from the portion cut out as the electrode is guided in the second direction different from the first direction. An electrode manufacturing facility comprising:
The cutting device cuts the electrode material in a state where the portion cut out as the electrode and the end material are connected by a non-cutting portion,
The guide device includes a separation roller around which the end material is wound to guide the end material in the second direction,
The said separation roller is provided with the 1st support part which supports the said exposed part in the said end material, and the 2nd support part which supports the said coating part, The electrode manufacturing equipment characterized by the above-mentioned.   The electrode manufacturing equipment according to claim 1, wherein the guide device includes a guide roller downstream of the separation roller in the second direction, and the guide roller includes the first support portion and the second support portion.   The electrode cutting facility according to claim 1, wherein the cutting device forms the non-cut portion in the exposed portion.   The separation roller is a stepped roller having a different diameter, the first support portion is provided in a large diameter portion, and the second support portion is provided in a smaller diameter portion than the first support portion. 3. The electrode manufacturing facility according to claim 1.   The said 1st support part is an electrode manufacturing equipment as described in any one of Claims 1-4 currently formed of the raising member provided in the surrounding surface of the roller main body.   The electrode manufacturing facility according to claim 5, wherein the raising member is a sheet-like member attached to a peripheral surface of the roller body.

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