JP2018085205A - Bonding device for electrode material, bonding method for electrode material, and electrode material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress an active material from falling from an active material mixture layer.SOLUTION: A bonding device for an electrode material includes: a holding part 52 holding both exposed portions 44 of electrode materials 41, 42; a motor 59 rotating the holding part 52; and a pressing part pressing a layered part formed by the rotation of the holding part 52. The holding part 52 holding both exposed portions 44 of electrode materials 41, 42 is wound, so that the exposed portions 44 of the electrode materials 41, 42 are overlapped in layers. The layered part is pressed by the pressing part, so that the electrode materials 41, 42 are bonded.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an electrode material bonding apparatus, an electrode material bonding method, and an electrode material.

  A power storage device such as a lithium ion secondary battery includes positive and negative electrodes. An electrode is manufactured by forming an electrode material having an active material mixture layer on both sides of a long strip-shaped metal foil excellent in heat conduction and electric conduction, and cutting the electrode material according to the shape of the electrode. Done.

  The electrode material is manufactured by applying an active material mixture to the belt-shaped metal foil being conveyed. The active material mixture is a paste in which an active material, a conductive agent, a solvent, and a binder are mixed. After manufacturing the electrode material, the defective portion is inspected. The defective portion is, for example, a portion where the thickness of the active material mixture layer that is a layer of the active material mixture applied to the band-shaped metal foil is insufficient. When a defective portion is detected, the defective portion is removed from the electrode material. For this reason, although electrode material is parted, the other part is not a defective part but a part which can manufacture an electrode. Therefore, after removing the defective part, the divided electrode materials are joined to each other for use in manufacturing the electrode.

  Patent Document 1 describes joining metals together by solid phase bonding. Solid phase bonding is a method in which metals are softened by heating and the metals are joined by pressurizing the softened part. When joining electrode materials by solid-phase joining, the strip | belt-shaped metal foil of each divided electrode material is heated, Furthermore, strip | belt-shaped metal foil is joined by pressurizing a strip | belt-shaped metal foil.

JP-A-6-47406

  By the way, when the strip metal foil is heated to join the electrode materials by solid phase bonding, heat is transferred from the strip metal foil to the active material mixture layer, and the binder contained in the active material mixture layer is decomposed by the influence of the heat. There is a risk of being. When the binder is decomposed, the active material may fall off the active material mixture layer. In the manufactured electrode, the portion where the active material has fallen causes an increase in the electrical resistance of the power storage device, and also causes damage to the separator in the case.

  An object of the present invention is to provide an electrode material bonding apparatus, an electrode material bonding method, and an electrode material that can prevent the active material from falling off the active material mixture layer.

  An electrode material bonding apparatus that solves the above problems is provided at a coating portion having a layer of an active material mixture on at least one side of a strip-shaped metal foil, and at the end in the longitudinal direction of the strip-shaped metal foil, and the strip-shaped metal foil A first electrode material and a second electrode material, each of which is provided with an exposed portion where both surfaces of the first electrode material and the second electrode material are bonded. And a drive unit that rotates the gripping part with the short direction of the strip-shaped metal foil as a direction in which the rotation axis extends, and a press part that presses the layered part where the exposed parts of both electrode materials overlap.

  When the gripping portion in a state where the exposed portion of the first electrode material and the exposed portion of the second electrode material are collectively gripped is rotated by the driving portion, the exposed portion of each electrode material is bent following the outer shape of the gripping portion, and the layered portion Is formed. When the layered portion is pressed by the pressing portion, the overlapping exposed portions are brought into close contact with each other, and the first electrode material and the second electrode material are joined. Since the strip metal foils are mechanically bonded to each other without heating the strip metal foil, the active material mixture layer is not heated to bond the electrode materials to each other. Therefore, dropping off of the active material due to heating of the active material mixture layer is suppressed.

  With respect to the electrode material bonding apparatus, the gripping portion includes a pair of gripping portions gripped by sandwiching both exposed portions, and each gripping portion includes a flat surface and the flatness along the short-side direction of the strip-shaped metal foil. It is a columnar shape that constitutes an outer peripheral surface with a curved surface that connects a pair of edges of the surface, and is held by sandwiching both exposed portions between the flat surfaces of each clamping portion.

  According to this, when the gripping part gripping both exposed parts is rotated, the exposed part bends following the curved surface of the clamping part. When a prismatic holding part is used, the load concentrates on a part of the exposed part when the corner hits the exposed part, but it is possible to suppress the concentration of the load by bending the exposed part following the curved surface.

About the manufacturing apparatus of the said electrode material, you may provide the pressurization part which pressurizes the said holding part.
According to this, it is possible to suppress the gripping force of the gripping part from being loosened, and it is possible to prevent the exposed part from being gripped by the gripping part.

  An electrode material joining method that solves the above problems is provided at a coating portion having an active material mixture layer on at least one surface of a strip-shaped metal foil, and at an end portion in the longitudinal direction of the strip-shaped metal foil, A first electrode material and a second electrode material, both of which are exposed to each other, and each of the exposed portions of each electrode material is gripped together by a gripping portion. The laminar portion where the exposed portions of both electrode materials overlap is pressed by rotating the gripping portion with the short direction of the strip-shaped metal foil as the direction in which the rotation axis extends, and rotating the gripping portion.

  According to this, a 1st electrode material and a 2nd electrode material can be joined by rotating a holding part and pressing a layered part. Since the strip metal foils are mechanically bonded to each other without heating the strip metal foil, the active material mixture layer is not heated to bond the electrode materials to each other. Therefore, dropping off of the active material due to heating of the active material mixture layer is suppressed.

About the joining method of the said electrode material, before holding the said exposed part of each electrode material with the said holding part, you may overlap the said exposed parts of each electrode material.
According to this, the area where the exposed portions overlap is increased, and the bonding strength between the first electrode material and the second electrode material is improved.

  An electrode material that solves the above problems is provided at a coating portion having an active material mixture layer on at least one surface of a strip-shaped metal foil, and at the end in the longitudinal direction of the strip-shaped metal foil, and both surfaces of the strip-shaped metal foil are exposed. The first electrode material and the second electrode material each having the exposed portion are joined at a joint portion, and the joint portion is in close contact with each other in a state where the exposed portions of both electrode materials overlap.

  The joining portion joins the first electrode material and the second electrode material by overlapping the exposed portions to each other. That is, the joining part joins the first electrode material and the second electrode material without being heated. Therefore, dropping off of the active material due to heating of the active material mixture layer is suppressed.

  According to the present invention, it is possible to suppress the falling off of the active material from the active material mixture layer.

(A) is a schematic block diagram of an electrode material manufacturing apparatus, (b) is a figure which shows the electrode material from which the defective part was removed by the cutting device, (c) is the 1st by which the active material mixture layer was removed by the removal apparatus. The figure which shows an electrode material and a 2nd electrode material, (d) is a schematic block diagram which shows the joining apparatus of an electrode material. (A) is a perspective view which shows a winding part, (b) is sectional drawing of a holding part. The side view of a winding part. The schematic block diagram which shows a press part. The side view of the exposed part wound around the winding core. The side view which shows a junction part. (A) is a perspective view which shows the holding part of a modification, (b) is sectional drawing which shows the holding part of a modification. Sectional drawing which shows the holding part of a modification. Sectional drawing which shows the holding part of a modification. Sectional drawing which shows the holding part which hold | gripped each exposed part in the state which does not overlap an exposed part. (A)-(d) The top view which shows the modification of an exposed part.

Hereinafter, an embodiment of an electrode material bonding apparatus, an electrode material bonding method, and an electrode material will be described.
The electrode material is used for producing positive and negative electrodes used in a power storage device such as a lithium ion secondary battery. The electrode material is formed by applying an active material mixture to a long strip-shaped metal foil. An electrode can be obtained by cutting the electrode material according to the shape of the electrode.

  As shown in FIG. 1A, the electrode material manufacturing apparatus 10 includes a supply device 12 that supplies a long strip-shaped metal foil 31, and a coating device 16 that applies an active material mixture to the strip-shaped metal foil 31. And a winding device 14 that winds up the electrode material 33.

  The supply device 12 includes a supply reel 13. A strip-shaped metal foil 31 is wound around the supply reel 13. The supply reel 13 rotates to send out the strip-shaped metal foil 31. The winding device 14 includes a winding reel 15. The take-up reel 15 rotates to take up the electrode material 33. The strip-shaped metal foil 31 is conveyed from the supply reel 13 toward the take-up reel 15 by the rotation of the take-up reel 15 and the supply reel 13.

  Two coating apparatuses 16 are provided with the band-shaped metal foil 31 interposed therebetween. Each coating apparatus 16 forms the active material mixture layer 32 on both surfaces of the strip metal foil 31 by applying the active material mixture continuously in the longitudinal direction of the strip metal foil 31. The active material mixture is a paste in which an active material, a conductive agent, a solvent, and a binder are mixed.

  The electrode material manufacturing apparatus 10 is arranged downstream of the coating apparatus 16 in the transport direction of the strip-shaped metal foil 31, and inspects the defective portion 34 of the electrode material 33, and in the transport direction of the strip-shaped metal foil 31, And a cutting device 18 that is disposed downstream of the inspection device 17 and cuts the defective portion 34. The defective portion 34 of the electrode material 33 is, for example, a portion where the thickness of the active material mixture layer 32 applied to the strip-shaped metal foil 31 is insufficient or a portion where the thickness of the active material mixture layer 32 is excessive. . The inspection device 17 is, for example, a device that performs inspection by image processing or a device that performs inspection by X-rays. When the defective portion 34 is detected by the inspection device 17, the cutting device 18 cuts the two portions sandwiching the defective portion 34 from the longitudinal direction of the electrode material 33 over the entire short direction. The defective portion 34 is removed by cutting with the cutting device 18.

  The electrode material manufacturing apparatus 10 includes a roll press 19 downstream of the cutting device 18 in the transport direction of the strip-shaped metal foil 31. The roll press 19 includes a pair of rollers 20. When the electrode material 33 passes between the rollers 20, the density of the active material mixture layer 32 is increased. The interval between the rollers 20 is set so that the active material mixture layer 32 can have a predetermined thickness.

  The electrode material 33 taken up by the take-up device 14 is then supplied to an electrode manufacturing apparatus that cuts the electrode material 33 into an electrode shape. The electrode manufacturing apparatus manufactures an electrode by cutting the electrode material 33 being conveyed.

  By the way, as shown in FIG.1 (b), when the electrode material 33 is cut | disconnected by the cutting device 18, the electrode material 33 will be divided | segmented into the 1st electrode material 41 and the 2nd electrode material 42 in the cut | disconnected location. In the present embodiment, in the conveying direction of the strip-shaped metal foil 31, the portion upstream of the cut portion is the first electrode material 41, and the portion downstream of the cut portion is the second electrode material 42. And

  When the electrode material 33 is divided, the first electrode material 41 cannot be taken up by the take-up reel 15 and the strip-shaped metal foil 31 cannot be conveyed. For this reason, after removing the defective part 34, the electrode material 33 is comprised by joining the 1st electrode material 41 and the 2nd electrode material 42. FIG. When joining the first electrode material 41 and the second electrode material 42, as shown in FIG. 1C, the electrode material 33 is cut out of the longitudinal ends of the electrode materials 41, 42. The active material mixture layer 32 is removed by the removing device 21 from both sides of the generated strip-shaped metal foil 31 at the end. Thereby, each electrode material 41 and 42 is provided in the coating part 43 which has the active material mixture layer 32 on both surfaces of the strip | belt-shaped metal foil 31, and the longitudinal end of the strip | belt-shaped metal foil 31, and the strip | belt-shaped metal foil 31 is provided. Each of the exposed portions 44 are exposed.

  And as shown in FIG.1 (d), the electrode material 33 is obtained by joining the exposed part 44 of each electrode material 41 and 42 with the joining apparatus 50 of an electrode material. The electrode material bonding apparatus 50 includes a winding unit 51 and a press unit 71. Hereinafter, the electrode material bonding apparatus 50 will be described in detail.

  As shown in FIG. 2A and FIG. 2B, the winding part 51 includes a grip part 52 that grips both the exposed parts 44 of the electrode materials 41 and 42 together. The grip portion 52 includes a pair of winding cores 53 and 54. One of the pair of winding cores 53 and 54 is a first winding core 53 and the other is a second winding core 54. The winding cores 53 and 54 have the same shape. Each of the winding cores 53 and 54 includes a cylindrical base portion 55 and a semi-cylindrical clamping portion 56. The sandwiching portion 56 of each of the winding cores 53 and 54 has a shape protruding in a semi-cylindrical shape from one end surface 55a of both end surfaces of the base portion 55 in the axial direction. The direction in which the central axis L of the base 55 extends is the axial direction. The projecting dimension of the clamping part 56 from the end face 55a is longer than the dimension in the short direction of the strip-shaped metal foil 31 (electrode material 33). The outer peripheral surface of the sandwiching portion 56 of each of the winding cores 53 and 54 includes a rectangular flat surface 57 and a curved surface 58 that connects a pair of long edges of the flat surface 57 facing each other. The curved surface 58 of the clamping part 56 is flush with the outer peripheral surface of the base part 55.

  When the exposed portions 44 of the electrode materials 41 and 42 are joined, the winding cores 53 and 54 are disposed so as to sandwich the exposed portions 44. At this time, the axial direction of the clamping part 56 and the short direction of the strip-shaped metal foil 31 (electrode material 33) are the same direction. Further, the flat surface 57 of the sandwiching portion 56 is disposed so as to face the exposed portion 44. The base portion 55 is positioned so as not to overlap the exposed portion 44 in plan view. That is, in a state where the flat surface 57 of the sandwiching portion 56 is in contact with the exposed portion 44, the base portion 55 is located outside the end portion of the strip-shaped metal foil 31 in the short direction. The base 55 of the first winding core 53 and the base 55 of the second winding core 54 are arranged so as not to overlap in plan view.

  Although illustration is omitted, the winding unit 51 includes an actuator that moves the winding cores 53 and 54 closer to and away from each other and an actuator that moves the winding cores 53 and 54 in the axial direction of the base 55. In a state where the flat surfaces 57 of the winding cores 53 and 54 are close to each other, the distal end surface (end surface opposite to the base portion 55) 56 a of the first winding core 53 is in contact with the base portion 55 of the second winding core 54. It faces the end surface 55a. The front end surface 56 a of the holding portion 56 of the second winding core 54 faces the end surface 55 a of the base portion 55 of the first winding core 53. That is, the first winding core 53 and the second winding core 54 can approach each other in a form in which the both winding cores 53 and 54 form a cylinder.

  The winding unit 51 includes a motor 59 as a drive unit that rotates the grip unit 52. The shaft of the motor 59 is connected to the base 55 of the second winding core 54. The second winding core 54 rotates with the central axis L of the base 55 as a rotation axis.

  As shown in FIG. 3, the winding unit 51 includes a pair of pressurizing units 61 that pressurize the cores 53 and 54. Each pressure unit 61 includes a pressure roller 62 and a roller support unit 63 that supports the pressure roller 62 in a rotatable state. Each pressure unit 61 is disposed such that the pressure roller 62 and the curved surface 58 of each of the winding cores 53 and 54 face each other, and the axial direction of the pressure roller 62 and the axial direction of the clamping unit 56 are the same direction. Is done.

  The winding part 51 includes an actuator 64 connected to the roller support part 63 of each pressure part 61. By driving the actuator 64, the pressure unit 61 moves toward the curved surface 58 and moves away from the curved surface 58.

  As shown in FIG. 4, the press unit 71 included in the electrode material bonding apparatus 50 includes an upper mold 72 and a lower mold 73. The pressing unit 71 presses the joining target by sandwiching the joining target between the upper mold 72 and the lower mold 73.

Next, an electrode material bonding method using the electrode material bonding apparatus 50 will be described together with its operation.
First, at least one of the electrode materials 41 and 42 is slightly unwound from at least one of the supply reel 13 and the take-up reel 15. Then, the exposed portion 44 of the first electrode material 41 and the exposed portion 44 of the second electrode material 42 are overlapped and positioned between the sandwiching portion 56 of the first winding core 53 and the sandwiching portion 56 of the second winding core 54. Let

Next, the first winding core 53 and the second winding core 54 are brought close to each other by the actuator, and the exposed portions 44 of both electrode materials 41 and 42 are sandwiched and held by the flat surfaces 57 of the both holding portions 56.
Next, the pressing unit 61 is brought close to the winding cores 53 and 54, and the curved surface 58 of each clamping unit 56 is pressed toward the exposed unit 44 by each pressing roller 62.

  Next, the second winding core 54 is rotated by the motor 59. When the second winding core 54 rotates, force is applied from the flat surface 57 of the second winding core 54 to the flat surface 57 of the first winding core 53 via the exposed portion 44. With this force, the first winding core 53 and the second winding core 54 rotate together. Since the axial direction of the base 55 and the sandwiching portion 56 of each of the winding cores 53 and 54 and the short direction of the strip-shaped metal foil 31 are the same direction, the gripping portion 52 (the first winding core 53 and the second winding core 54) is The short metal direction of the strip-shaped metal foil 31 is rotated as the direction in which the rotation axis extends (rotation axis direction).

  As shown in FIG. 5, when the gripping portion 52 rotates, the exposed portions 44 of the electrode materials 41 and 42 are wound around the curved surface 58 of each clamping portion 56 that is the outer shape of the gripping portion 52. Thereby, the layered region 45 in which the exposed portions 44 are wound is formed. The layered portion 45 is a portion where the exposed portions 44 of the electrode materials 41 and 42 overlap. In addition, the rotation speed of the holding | gripping part 52 (motor 59) is set to the range which can overlap the exposed part 44 of both electrode materials 41 and 42 in layers. As long as the exposed portions 44 can be stacked in layers, the number of rotations of the grip portion 52 may be set within a range that does not reach one rotation, such as a half circumference.

When the layered portion 45 is configured, the holding portions 56 of the cores 53 and 54 are pulled out from the layered portion 45 by moving the winding cores 53 and 54 in the axial direction.
Next, the layered portion 45 is pressed by the pressing unit 71. As shown in FIG. 6, a layered portion 45 is caulked by pressing, and a bonded portion 46 that is in close contact with each other in a state where the exposed portions 44 overlap in a layered manner is obtained. The exposed portions 44 of both the electrode materials 41 and 42 are firmly fixed by the joint portion 46, and the electrode material 33 in which the first electrode material 41 and the second electrode material 42 are joined by the joint portion 46 can be obtained.

In the electrode material 33, when the dimension in the direction in which the belt-shaped metal foil 31 and the active material mixture layer 32 overlap is defined as the thickness, the thickness of the bonding portion 46 is thinner than the thickness of the coating portion 43 of the electrode material 33.
Therefore, according to the above embodiment, the following effects can be obtained.

  (1) The electrode material joining apparatus 50 grips both the exposed portions 44 of the electrode materials 41 and 42 together with the grip portion 52, and rotates the grip portion 52 with the motor 59. Furthermore, the exposed portions 44 can be joined together by pressing the layered portion 45 obtained by the rotation of the grip portion 52 with the press portion 71. Therefore, in the electrode material 33 bonding method using the electrode material bonding apparatus 50, the electrode materials 41 and 42 are mechanically bonded without heating the exposed portion 44. By transferring heat from the strip-shaped metal foil 31 to the active material mixture layer 32, the binder contained in the active material mixture layer 32 is not decomposed and the active material is prevented from dropping from the active material mixture layer 32. .

  (2) The sandwiching portion 56 that sandwiches the exposed portion 44 of each electrode material 41, 42 includes a flat surface 57 and a curved surface 58, and sandwiches the exposed portion 44 between the flat surfaces 57. When the grip portion 52 is rotated, the exposed portion 44 is wound around the curved surface 58 of each clamping portion 56. When the sandwiching portion 56 has a prismatic shape, the load concentrates on a portion of the exposed portion 44 that contacts the corner, and the strip-shaped metal foil 31 may be broken. By winding the exposed portion 44 around the curved surface 58, it is possible to suppress the concentration of load and prevent the strip-shaped metal foil 31 from being broken.

  In addition, since the pressure roller 62 rotates along the curved surface 58 by setting the surface around which the exposed portion 44 is wound as a curved surface 58, the pressure applied by the pressure roller 62 compared to the case where the sandwiching portion 56 is formed in a prismatic shape. Easy to do.

  (3) The electrode material bonding apparatus 50 includes a pressurizing unit 61 that pressurizes the winding cores 53 and 54 toward the exposed portion 44. By pressurizing the gripping part 52 with the pressurizing part 61, the gripping force of the gripping part 52 is suppressed from being loosened, and the exposed part 44 of each electrode material 41, 42 can be prevented from being gripped.

  When the winding cores 53 and 54 are rotated while pressurizing the winding cores 53 and 54 with the pressurizing unit 61, the exposed portions 44 are exposed to the winding cores 53 and 54 while the exposed portion 44 is sandwiched between the winding cores 53 and 54 and the pressure roller 62. Will be wound. As a result, the exposed portion 44 can be wound around the grip portion 52 while extending the wrinkles by the pressure roller 62, and wrinkles are hardly generated in the exposed portion 44. As a result, it is possible to suppress an increase in the thickness of the joint portion 46 due to wrinkles and breakage.

  (4) After the exposed portions 44 of the electrode materials 41 and 42 are overlapped with each other, both the exposed portions 44 are held by the holding portion 52. When the gripped portion 52 is rotated the same number of times when the overlapped exposed portion 44 is gripped by the gripping portion 52 and when the exposed portion 44 that is not overlapped is gripped by the gripping portion 52, the exposed portion 44 is overlapped. In the case of matching, the area where the exposed portions 44 overlap is larger. For this reason, in the joint part 46, the joint area of the exposed parts 44 also increases, and the strength of the joint part 46 can be improved.

  (5) The thickness of the joint portion 46 is thinner than the thickness of the coating portion 43 of the electrode material 33. If a member thicker than the coating part 43 is pressed, the roller 20 of the roll press 19 may be damaged. By making the joining portion 46 thinner than the coating portion 43, the roller 20 is prevented from being damaged.

In addition, you may change embodiment as follows.
○ As shown in FIGS. 7A and 7B, the pinching portion 56 of each of the winding cores 53 and 54 is inclined and tapered so that the flat surface 57 approaches the apex of the curved surface 58 toward the tip surface 56a. It may be. In this case, when the clamping part 56 is removed from the layered part 45, a gap is formed between the outer peripheral surface of the clamping part 56 and the layered part 45 by slightly moving the clamping part 56 in the axial direction. Since the gap is formed, the layered portion 45 and the outer peripheral surface of the sandwiching portion 56 are hardly in contact with each other, and the sandwiching portion 56 can be easily removed from the layered portion 45.

  ○ As shown in FIG. 8, the grip portion may include three or more winding cores. In FIG. 8, the gripping unit 80 includes three winding cores 81, 82, and 83. Two winding cores 81, 82, 83 are arranged along the exposed portion 44 of the first electrode material 41, and one winding core 81, 82, 83 is arranged along the exposed portion 44 of the second electrode material 42. The winding core 83 disposed along the exposed portion 44 of the second electrode material 42 is disposed so as to face between the two winding cores 81 and 82 disposed along the exposed portion 44 of the first electrode material 41. Has been. That is, the exposed portion 44 is not sandwiched between the winding cores 81, 82, 83. Even in this case, the exposed portion 44 is wound around the grip portion 80 by rotating the grip portion 80.

  As shown in FIG. 9, the grip portion 90 may include flat winding cores 91 and 92. In this case, by rotating the cores 91 and 92, the exposed portion 44 bends following the outer shape of the cores 91 and 92. In this case, it is possible to obtain a joint 46 bent in a square shape.

The winding cores 53 and 54 may not have the base portion 55 but may have a shape having only the clamping portion 56.
As shown in FIG. 10, both the exposed portions 44 of the electrode materials 41 and 42 may be held together by the holding portion 52 without overlapping the exposed portions 44.

  The shapes of the exposed portions 44 of the first electrode material 41 and the second electrode material 42 may be changed as appropriate. For example, as shown in FIGS. 11A and 11B, the exposed portion 44 has a lengthwise dimension of the strip-shaped metal foil 31 that gradually increases from one end to the other end of the strip-shaped metal foil 31 in the short direction. The tip may be inclined so as to be. As shown in FIG. 11A, the first electrode material 41 and the second electrode material 42 may be arranged so that portions of the exposed portion 44 whose longitudinal dimension of the strip-shaped metal foil 31 is long face each other. As shown in FIG. 11 (b), a portion of the exposed portion 44 in which the longitudinal length of the strip-shaped metal foil 31 is long and a portion of the exposed portion 44 in which the longitudinal dimension of the strip-shaped metallic foil 31 is short are opposed to each other. In addition, the first electrode material 41 and the second electrode material 42 may be disposed.

  As shown in FIG. 11C, the exposed portion 44 may have a pointed shape such that the longitudinal dimension of the strip-shaped metal foil 31 gradually increases toward the center in the short-side direction of the strip-shaped metal foil 31. As shown in FIG. 11D, the exposed portion 44 may have a shape in which the edge in the longitudinal direction of the strip-shaped metal foil 31 is wavy.

The gripping unit 52 may be rotated without pressurizing the gripping unit 52 by the pressurizing unit 61.
The pressure unit 61 is not limited to a shape including the pressure roller 62. For example, a member that does not obstruct the rotation of the winding cores 53 and 54 even when contacting, such as a member manufactured from a low friction material, may be used as the pressing unit 61.

-Three or more pressurization parts 61 may be provided. For example, when three pressurizing units 61 are provided, the pressurizing units 61 are arranged at intervals of 120 degrees along the rotation direction of the gripping unit 52.
The coating device 16 may apply an active material mixture (so-called intermittent coating) with a predetermined interval in the longitudinal direction of the strip-shaped metal foil 31. When the active material mixture is intermittently applied, an exposed portion 44 exists between the coating portions 43. When the defective part 34 is detected by the inspection device 17, the entire coating part 43 including the defective part 34 is removed. As a result, the exposed portion 44 is positioned at one end in the longitudinal direction of the first electrode material 41 and the second electrode material 42. In this case, the first electrode material 41 and the second electrode material 42 can be joined without removing the active material mixture layer 32 by the removing device 21.

  The coating device 16 may apply the active material mixture layer 32 only on one side of the strip-shaped metal foil 31. In this case, the removing device 21 removes the active material mixture layer 32 from one surface of the strip-shaped metal foil 31.

  DESCRIPTION OF SYMBOLS 31 ... Strip | belt-shaped metal foil, 32 ... Active material mixture layer, 33 ... Electrode material, 41 ... 1st electrode material, 42 ... 2nd electrode material, 43 ... Coating part, 44 ... Exposed part, 45 ... Layered part, 46 DESCRIPTION OF SYMBOLS ... Joining part, 50 ... Electrode material joining apparatus, 52 ... Holding part, 56 ... Holding part, 57 ... Flat surface, 58 ... Curved surface, 59 ... Motor (drive part), 61 ... Pressurizing part, 71 ... Press part.

Claims (6)

A coating part having an active material mixture layer on at least one surface of the strip-shaped metal foil, and an exposed portion provided at an end portion in the longitudinal direction of the strip-shaped metal foil and exposing both surfaces of the strip-shaped metal foil. An electrode material joining apparatus for joining one electrode material and a second electrode material,
A gripping portion that grips both of the exposed portions of each electrode material together;
A driving unit that rotates the gripping unit with a short direction of the strip-shaped metal foil as a direction in which a rotation axis extends,
An apparatus for joining electrode materials, comprising: a pressing portion that presses a layered portion where the exposed portions of both electrode materials overlap each other. The gripping part includes a pair of gripping parts that grips both the exposed parts,
Each clamping part is a columnar shape that constitutes an outer peripheral surface with a flat surface and a curved surface connecting a pair of edges of the flat surface along the short direction of the strip-shaped metal foil,
The electrode material bonding apparatus according to claim 1, wherein the flat surfaces of each clamping part are held between both exposed parts.   The electrode material bonding apparatus according to claim 1, further comprising a pressurizing unit that pressurizes the gripping unit. A coating part having an active material mixture layer on at least one surface of the strip-shaped metal foil, and an exposed portion provided at an end portion in the longitudinal direction of the strip-shaped metal foil and exposing both surfaces of the strip-shaped metal foil. An electrode material joining method for joining one electrode material and a second electrode material,
Grip both the exposed parts of each electrode material together with the gripping part,
With the short direction of the strip-shaped metal foil as the direction in which the rotation axis extends, the gripping part is rotated,
An electrode material joining method of pressing a layered portion where the exposed portions of both electrode materials overlap each other by rotating the gripping portion.   The method for joining electrode materials according to claim 4, wherein both the exposed portions are overlapped before the both exposed portions are gripped by the grip portion. A coating part having an active material mixture layer on at least one surface of the strip-shaped metal foil, and an exposed portion provided at an end portion in the longitudinal direction of the strip-shaped metal foil and exposing both surfaces of the strip-shaped metal foil. 1 electrode material and 2nd electrode material are joined at a joint,
The joint portion is an electrode material that is in close contact with each other in a state where the exposed portions of both electrode materials overlap.

Images