JP2018073631A - Taping device of electrode assembly - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrain turning of an electrode at the time of taping.SOLUTION: A taping device 40 of electrode assembly includes an electrode pressing member 41, a first moving member 42 as an electrode pressing member movement mechanism for moving each electrode pressing member 41, and a sticking mechanism 50. The sticking mechanism 50 includes a holding member 51 for holding a tape 30, a second moving member 61 for moving the holding member 51 toward the an electrode assembly 20, a roller 67 for pressing the tape 30 against the first end face 20A of the electrode assembly 20, and a third moving member 70 for moving the roller 67 along the first end face 20A. When sticking the tape 30 to the electrode assembly 20, the roller 67 moves along the first end face 20A from the edge E of the first end face 20A. On this occasion, the electrode pressing member 41 is driven by the first moving member 42 to recede from the roller 67.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a tape attaching apparatus for an electrode assembly.

  A power storage device such as a secondary battery includes a case and an electrode assembly housed in the case. The case includes a bottomed cylindrical case main body and a lid that closes an opening of the case main body. The electrode assembly includes positive and negative electrodes and a separator provided between the positive and negative electrodes. The electrode and the separator are laminated. A tape for restricting variations in electrodes and separators is attached to the electrode assembly. For example, Patent Document 1 discloses a tape attaching device for an electrode assembly that attaches a tape to an electrode assembly.

  As shown in FIG. 11A, an electrode assembly tape attaching apparatus 200 described in Patent Document 1 connects both end surfaces 203 and both end surfaces 203 in the stacking direction of the electrodes 202 in the electrode assembly 201. A tape 205 is affixed over the entire surface 204. The electrode assembly tape attaching apparatus 200 includes a tape pressing member 206 that attaches the tape 205 to the electrode assembly 201 by moving while pressing the tape 205 against the electrode assembly 201. The tape pressing member 206 includes a swinging member 207 that is rotatably provided, and a roller 208 that is attached to the swinging member 207. When the tape 205 is attached to the electrode assembly 201, the roller 208 moves from one surface 204 along one of the two end surfaces 203 in the stacking direction by the swing of the swing member 207, so that the tape 205 is attached. Attached.

JP 2013-71738 A

  By the way, as shown in FIG. 11B, when the roller 208 moves from the one surface 204 to the end surface 203, the edge of the electrode 202 together with the tape 205 is pushed away from the one surface 204 by the roller 208. The edges of the If the edge of the electrode 202 is bent, the bent portion partially protrudes from the end surface 203, and when the electrode assembly is inserted and accommodated in the case body, it may be difficult to accommodate the electrode assembly.

  An object of the present invention is to provide a tape applicator for an electrode assembly that can prevent the electrode from twisting during tape application.

  An electrode assembly tape sticking device that solves the above-described problems is an electrode assembly having a plurality of stacked electrodes, and extends across a first sticking surface and a second sticking surface that are outer surfaces of the electrode assembly. A tape applicator for an electrode assembly that applies a tape in order from the first application surface to the second application surface, and holds the tape in a state where the adhesive surface of the tape faces the first application surface. A member, a holding member moving mechanism for moving the holding member toward the first sticking surface, and sticking the tape to the first sticking surface, and the second sticking surface in the stacking direction of the electrodes. When the tape pressing member that is pressed through and the surface facing the tape among the surfaces connected to the second application surface is the opposing surface, the tape pressing member is the surface of the tape attached to the first application surface. In a state where the second sticking surface is pressed in the stacking direction via the surface opposite to the wearing surface, the tape pressing member is moved along the second sticking surface from the facing surface side of the second sticking surface. A tape pressing member moving mechanism for moving and affixing the tape to the second affixing surface; an electrode pressing member for pressing the second affixing surface in the stacking direction; and the tape pressing member by the tape pressing member movement mechanism An electrode pressing member moving mechanism that moves the electrode pressing member along the moving direction of the tape pressing member on the downstream side in the moving direction of the tape pressing member along with the movement along the second sticking surface.

  According to this, when the tape is applied to the electrode assembly, the holding member holding the tape moves toward the first application surface by the holding member moving mechanism, and the adhesive surface of the tape is pressed against the first application surface. Then, the tape is affixed to the first affixing surface. Furthermore, by the movement of the tape pressing member by the tape pressing member moving mechanism, the adhesive surface of the tape is pressed against the second application surface, and the tape is applied to the second application surface. The tape pressing member moves along the second pasting surface from the opposite surface side of the second pasting surface. At this time, since the second pasting surface is pressed by the electrode pressing member, the tape pressing member is second pasting. Even when the surface is pressed in the laminating direction and moves along the second pasting surface from the opposite surface side of the second pasting surface, the edge of the electrode is suppressed from being rolled. Further, since the electrode pressing member moves along the moving direction of the tape pressing member by the electrode pressing member moving mechanism, the tape is suppressed from sticking to the electrode pressing member.

  An electrode assembly tape sticking device that solves the above-described problems is an electrode assembly having a plurality of stacked electrodes, and extends across a first sticking surface and a second sticking surface that are outer surfaces of the electrode assembly. A tape applicator for an electrode assembly that applies a tape in order from the first application surface to the second application surface, and holds the tape in a state where the adhesive surface of the tape faces the first application surface. A member, an electrode moving mechanism for moving the electrode assembly toward the holding member, and affixing the tape to the first affixing surface, and the second affixing surface in the stacking direction of the electrodes via the tape When the tape pressing member to be pressed and the surface facing the tape among the surfaces connected to the second application surface are opposing surfaces, the tape pressing member is bonded to the first application surface. The tape pressing member is moved along the second pasting surface from the opposite surface side of the second pasting surface in a state where the second pasting surface is pressed in the laminating direction via the surface opposite to the first side. A tape pressing member moving mechanism for sticking the tape to the second sticking surface, an electrode pressing member for pressing the first sticking surface in the stacking direction, and the tape pressing member moving mechanism by the tape pressing member moving mechanism. 2. An electrode pressing member moving mechanism that moves the electrode pressing member along the moving direction of the tape pressing member on the downstream side in the moving direction of the tape pressing member along with the movement along the pasting surface.

  According to this, when affixing the tape to the electrode assembly, the electrode assembly is moved toward the holding member by the electrode moving mechanism, the first affixing surface is pressed against the adhesive surface of the tape, and the tape is 1 Affixed to the affixing surface. Furthermore, by the movement of the tape pressing member by the tape pressing member moving mechanism, the adhesive surface of the tape is pressed against the second application surface, and the tape is applied to the second application surface. The tape pressing member moves along the second pasting surface from the opposite surface side of the second pasting surface. At this time, since the second pasting surface is pressed by the electrode pressing member, the tape pressing member is second pasting. Even when the surface is pressed in the laminating direction and moves along the second pasting surface from the opposite surface side of the second pasting surface, the edge of the electrode is suppressed from being rolled. Further, since the electrode pressing member moves along the moving direction of the tape pressing member by the electrode pressing member moving mechanism, the tape is suppressed from sticking to the electrode pressing member.

  With respect to the tape applicator for the electrode assembly, assuming that the opposing surface is extended in the stacking direction as a virtual surface, the electrode pressing member is in a state where the tape is attached to the opposing surface. And an inclined surface that faces the adhesive surface protruding from the edge of the second application surface of the tape in the laminating method and inclines away from the imaginary surface as it moves away from the second application surface in the lamination direction. Also good.

  The virtual surface is a portion where the tape protruding from the edge is located in a state where the adhesive surface is attached to the opposite surface and the tape protrudes from the edge of the second bonding surface. When one surface of the electrode pressing member is flush with the virtual surface, the adhesive surface comes into contact with the electrode pressing member when the tape is attached to the opposing surface. By providing the electrode pressing member with an inclined surface that is separated from the virtual surface, the tape does not easily contact the electrode pressing member when the tape is applied, and the electrode pressing member does not easily stick.

  About the tape sticking apparatus for the electrode assembly, the electrode pressing member moving mechanism may move the electrode pressing member in a direction intersecting both the direction along the second sticking surface and the stacking direction.

  According to this, when the electrode pressing member is moved while being pressed in the stacking direction with respect to the first end face in order to stick the tape to the second sticking surface, the electrode pressing member slides on the second sticking surface. It can suppress that a 2nd sticking surface is damaged by.

In the tape applicator for the electrode assembly, the holding member may include an adsorbing portion that holds the tape by adsorbing a surface opposite to the adhesive surface.
According to this, the adhesive surface does not contact the holding member, and the tape is easily detached from the holding member.

  ADVANTAGE OF THE INVENTION According to this invention, the bending of the electrode at the time of tape bonding can be suppressed.

The disassembled perspective view of the secondary battery in embodiment. The disassembled perspective view of the electrode assembly in embodiment. The schematic block diagram of the tape sticking apparatus of the electrode assembly in embodiment. The schematic block diagram of the tape sticking apparatus of the electrode assembly in embodiment. Schematic which shows the effect | action at the time of sticking a tape using the tape sticking apparatus of the electrode assembly in embodiment. Schematic which shows the effect | action at the time of sticking a tape using the tape sticking apparatus of the electrode assembly in embodiment. Schematic which shows the effect | action at the time of sticking a tape using the tape sticking apparatus of the electrode assembly in embodiment. The schematic block diagram which shows the tape sticking apparatus of the electrode assembly of a modification. The schematic block diagram which shows the electrode press member of a modification. The schematic block diagram which shows the tape sticking apparatus of the electrode assembly of a modification. (A) is a schematic block diagram which shows the prior art of the tape sticking apparatus of an electrode assembly, (b) is a figure which expands and shows the wound electrode.

Hereinafter, an embodiment of a tape attaching apparatus for an electrode assembly will be described.
As shown in FIG. 1, the secondary battery 10 includes a case 11. The case 11 includes a bottomed cylindrical case body 12 and a lid 13 that closes the opening 12 a of the case body 12. The secondary battery 10 includes an electrode assembly 20 accommodated in a case 11 and an electrolytic solution (not shown).

  As shown in FIG. 2, the electrode assembly 20 includes a plurality of negative electrodes 21 as electrodes and a plurality of storage electrodes 22 as electrodes. Each storage electrode 22 includes a positive electrode 23 and a bag-shaped separator 24 that stores the positive electrode 23. The electrode assembly 20 is configured by laminating a positive electrode 23 and a negative electrode 21 while being insulated from each other by a bag-like separator 24. In the following description, the direction in which the positive electrode 23, the negative electrode 21, and the bag-shaped separator 24 are stacked is referred to as a “stacking direction”.

  The negative electrode 21 and the positive electrode 23 include a metal foil 25. The metal foil 25 includes a rectangular sheet-like main body 26. The metal foil 25 includes a tab 27 on one side of the main body 26 (long side in the present embodiment). The metal foil 25 of the positive electrode 23 is, for example, an aluminum foil. The metal foil 25 of the negative electrode 21 is, for example, a copper foil.

  The longitudinal dimension of the main body 26 in the positive electrode 23 is shorter than the longitudinal dimension of the main body 26 in the negative electrode 21. The dimension in the short direction of the main body 26 in the positive electrode 23 is shorter than the dimension in the short direction of the main body 26 in the negative electrode 21.

  The negative electrode 21 and the positive electrode 23 include active material layers 28 on both surfaces of the metal foil 25. The active material layer 28 contains an active material for each polarity, a binder, a conductive aid, and the like.

  The bag-shaped separator 24 includes a rectangular sheet-shaped first separator piece 24a and a second separator piece 24b. Each separator piece 24a, 24b is the same shape. The longitudinal dimension of each separator piece 24a, 24b is the same as or approximately the same as the longitudinal dimension of the main body 26 of the negative electrode 21. The dimensions in the short direction of the separator pieces 24 a and 24 b are the same as or substantially the same as the dimensions in the short direction of the main body 26 of the negative electrode 21. Each separator piece 24a, 24b is a porous insulator. The tab 27 of the positive electrode 23 protrudes from the edge of the bag separator 24.

  The peripheral edge of the first separator piece 24a that protrudes from the edge of the main body 26 and the peripheral edge of the second separator piece 24b that protrudes from the edge of the main body 26 are thermally welded to each other. Thus, the storage electrode 22 is configured in which the positive electrode 23 is stored in the square bag-shaped bag-shaped separator 24. The longitudinal dimension of the bag-like separator 24 is the same as the longitudinal dimension of each separator piece 24a, 24b. The dimension in the short direction of the bag-like separator 24 is the same as the dimension in the short direction of each separator piece 24a, 24b. Therefore, when the negative electrode 21 and the storage electrode 22 are overlapped, the edges are easily aligned. In the storage electrode 22, the thickness (size in the stacking direction) of the peripheral edge of the bag-shaped separator 24 is thinner than the thickness of the portion where the positive electrode 23 and the bag-shaped separator 24 overlap.

  As shown in FIG. 1, among the outer surfaces of the electrode assembly 20, both surfaces in the stacking direction are first end surfaces 20 </ b> A, and four surfaces (surfaces connecting the first end surfaces 20 </ b> A) are connected to the first end surface 20 </ b> A. It is set as the 2nd end surface 20B, respectively. 20 A of 1st end surfaces are comprised by one surface of the negative electrode 21 or the storage electrode 22 located in the both ends of the lamination direction. Each 2nd end surface 20B is comprised by the edge of the negative electrode 21 and the edge of the storage electrode 22 (bag-like separator 24) continuing.

  The secondary battery 10 includes a tape 30 attached to the electrode assembly 20. In this embodiment, six tapes 30 are attached. Each tape 30 is affixed over both the first end surfaces 20A and one second end surface 20B. The tape 30 restricts the negative electrode 21 and the storage electrode 22 from spreading. The tape 30 is affixed by a tape applicator for the electrode assembly. Hereinafter, the tape applicator for the electrode assembly will be described. For convenience of explanation, the electrode assembly 20 is schematically shown in FIGS.

  As shown in FIG. 3, when the tape 30 is applied by the electrode assembly tape applying device 40, the electrode assembly 20 is held between the pair of holding jigs 31 from the stacking direction. Each holding jig 31 has the same shape. Each holding jig 31 includes projecting portions 32 projecting from the four edges E of the first end surface 20A in the direction along the first end surface 20A with the electrode assembly 20 interposed therebetween. The holding jig 31 includes a notch 33 that exposes the first end face 20A. The notch 33 is provided so as to sandwich each protrusion 32. Due to the notch 33, the edge E of the first end face 20A is exposed. The notch 33 is provided at a position where the tape 30 is attached. Each holding jig 31 includes notches 33 at six locations. The notches 33 of each holding jig 31 face each other in the stacking direction.

  The electrode assembly tape applicator 40 includes six electrode assembly tape applicators 40 corresponding to the six notches 33 of each holding jig 31. The tape applicator 40 of each electrode assembly has the same configuration. The electrode assembly tape attaching apparatus 40 includes a pair of electrode pressing members 41, a first moving member 42 as an electrode pressing member moving mechanism for moving each electrode pressing member 41, and an attaching mechanism 50. The tape applicator 40 of the electrode assembly of this embodiment applies the tape in the order from the second end face 20B to the first end face 20A. Therefore, the second end face 20B becomes the first sticking face, and the first end face 20A becomes the second sticking face.

  As shown in FIG. 4, the attaching mechanism 50 includes a holding member 51 that holds the tape 30 before being attached to the electrode assembly 20. The holding member 51 includes a rectangular parallelepiped suction portion 52. The suction part 52 includes a plurality of holes 53. A suction device (not shown) is connected to the hole 53, and suction force is generated by making the inside of the hole 53 a negative pressure. The holding member 51 includes a rectangular parallelepiped elastic body 54 that is fixed to one surface of the suction portion 52 where the hole 53 opens. The holding member 51 is formed in a rectangular parallelepiped shape by the adsorption portion 52 and the elastic body 54. The elastic body 54 is, for example, a sponge or rubber. The elastic body 54 includes a hole 55 that communicates with the hole 53 of the suction portion 52. The holes 53, 55 communicate with each other, thereby forming the suction hole 56 that penetrates the holding member 51. The holding member 51 includes a suction surface 57 where the suction hole 56 opens on one surface of the elastic body 54.

  In the holding member 51, among the four surfaces connected to the suction surface 57, the distance between the two surfaces 58 facing each other is the same as or approximately the same as the dimension in the stacking direction of the second end surface 20B. In other words, in the suction surface 57, the dimension in the facing direction of the surfaces 58 is the same as or substantially the same as the dimension in the stacking direction of the second end surface 20B.

The holding member 51 is disposed so that the suction surface 57 and the second end surface 20B face each other, and the facing direction of the surfaces 58 coincides with the stacking direction.
The tape 30 sticks to the suction surface 57 by the suction force generated in the suction hole 56. One surface of the tape 30 is an adhesive surface 30a, and the surface opposite to the adhesive surface 30a is a non-adhesive surface 30b. The adhesive surface 30a is a surface having an adhesive or an adhesive. The holding member 51 holds the tape 30 by adsorbing the non-adhesive surface 30b. In addition, the holding member 51 causes the tape 30 to be detached by preventing an adsorption force from being generated.

  The tape 30 is obtained by cutting a long tape that is longer than the tape 30 into a predetermined length. The predetermined length is longer than the dimension of the second end surface 20B in the stacking direction. Therefore, both ends of the tape 30 protrude from the edge of the suction surface 57 in the opposite direction of the surface 58 in a state where the tape 30 is sucked to the suction surface 57. While being held by the holding member 51, the adhesive surface 30a of the tape 30 faces the second end surface 20B.

  The long tape is cut by a tape cutter. The tape 30 may be transported to the holding device by a device that transports the tape 30 cut by the tape cutter. Further, the holding member 51 may be moved to the tape cutter, and the tape 30 cut by the holding member 51 with the tape cutter may be directly held.

  The sticking mechanism 50 includes a second moving member 61 as a holding member moving mechanism. The second moving member 61 is an actuator such as an air cylinder. The second moving member 61 includes a rod 62. The second moving member 61 moves the holding member 51 fixed to the protruding end of the rod 62 by the protrusion and withdrawal of the rod 62 in the cylinder tube. The rod 62 can move linearly in a direction orthogonal to the second end face 20B. Due to the protrusion of the rod 62 by the second moving member 61, the holding member 51 is movable toward the second end surface 20 </ b> B of the electrode assembly 20. In addition, the holding member 51 can move away from the second end face 20 </ b> B of the electrode assembly 20 by the immersion of the rod 62 by the second moving member 61.

  The sticking mechanism 50 includes a pair of sticking members 63. Each sticking member 63 includes a support member 64, a coil spring 66 supported by the support member 64, a shaft member 65 supported by the support member 64, and a roller 67 provided rotatably at the tip of the shaft member 65. Prepare. The shaft member 65 passes through the coil spring 66. The shaft member 65 is supported by the support member 64 so as to be movable in the axial direction. One end of the coil spring 66 is attached to the support member 64, and the other end of the coil spring 66 is attached to the shaft member 65. The coil spring 66 biases the roller 67 away from the support member 64.

  In each sticking mechanism 50, the pair of sticking members 63 are arranged so that the holding member 51 is sandwiched between rollers 67 as tape pressing members. The roller 67 of each sticking member 63 presses the surface 58 of the holding member 51 by the biasing force of the coil spring 66. As a result, the roller 67 faces the non-adhesive surface 30b of the portion protruding from the suction surface 57 (holding member 51) of the tape 30.

  The sticking mechanism 50 includes a third moving member 70 as a tape pressing member moving mechanism. The third moving member 70 is an actuator such as an air cylinder. The third moving member 70 includes a rod 71. The 3rd moving member 70 moves the sticking member 63 fixed to the protrusion end of the rod 71 by the protrusion / projection of the rod 71 to / from the cylinder tube. The rod 71 is linearly movable in a direction orthogonal to the second end surface 20B. The sticking member 63 can be moved in the same direction as the moving direction of the holding member 51 by the protrusion and immersion of the rod 71 by the third moving member 70. The sticking member 63 can be moved along the surface 58 of the holding member 51 by the third moving member 70. Further, the sticking member 63 is movable along the first end face 20 </ b> A of the electrode assembly 20 beyond the surface 58 of the holding member 51.

  As shown in FIGS. 3 and 4, one electrode pressing member 41 is arranged in each notch 33. Each electrode pressing member 41 has the same shape. The electrode pressing member 41 has a hexahedral shape in which a pair of facing surfaces are trapezoidal. A surface connecting the long sides of the two sides parallel to the trapezoidal surface is referred to as a first surface 43, and a surface connecting the short sides is referred to as a second surface 44. The electrode pressing member 41 includes an inclined surface 45 that is inclined from the second surface 44 toward the first surface 43. The electrode pressing member 41 is disposed with the first surface 43 and the first end surface 20A facing each other. The inclined surface 45 is disposed so as to be inclined from the second surface 44 toward the edge E of the first end surface 20A in the notch 33.

  The first moving member 42 is an actuator such as an air cylinder. The first moving member 42 includes a rod 46. The first moving member 42 moves the electrode pressing member 41 fixed to the projecting end of the rod 46 by the protrusion and withdrawal of the rod 46 in the cylinder tube. The rod 46 linearly moves in a direction intersecting both the stacking direction and the direction along the first end surface 20A.

  Due to the protrusion of the rod 46 by the first moving member 42, the electrode pressing member 41 is movable to a position in contact with the first end face 20A. At the position where the electrode pressing member 41 contacts the first end surface 20A, the electrode pressing member 41 is positioned along the edge E of the first end surface 20A. At this time, assuming a virtual surface S obtained by extending the second end surface 20B in the stacking direction, the inclined surface 45 is inclined so as to be separated from the virtual surface S as the distance from the first end surface 20A increases in the stacking direction.

  In addition, the electrode pressing member 41 is movable away from the edge E by the immersion of the rod 46 by the first moving member 42. When the electrode pressing member 41 is separated from the edge E, it is also separated from the first end face 20A. That is, by making the moving direction of the rod 46 a direction that intersects both the direction along the first end surface 20A and the stacking direction, the electrode pressing member 41 does not slide on the first end surface 20A when leaving the edge E.

Next, the operation of the electrode assembly tape attaching apparatus 40 of the present embodiment will be described.
As shown in FIG. 4, when the tape 30 is applied by the electrode assembly tape applying device 40, the tape 30 is first held by the holding member 51 by suction. Further, the edge E of the first end face 20 </ b> A is pressed in the stacking direction by the electrode pressing member 41 by the movement of the electrode pressing member 41 to the edge E by the driving of the first moving member 42.

  As shown in FIG. 5, the holding member 51 and each sticking member 63 approach the second end surface 20 </ b> B of the electrode assembly 20 by driving the second moving member 61 and the third moving member 70. The holding member 51 presses the adhesive surface 30a of the tape 30 against the second end surface 20B. At this time, the elastic surface 54 is elastically deformed, so that the attracting surface 57 follows the shape of the second end surface 20B. Since the second end surface 20B is configured by the peripheral edge of the negative electrode 21 and the peripheral edge of the bag-shaped separator 24 being continuous, there are fine undulations. When the elastic body 54 is elastically deformed following the second end surface 20B, the tape 30 also has a shape corresponding to the undulation, and the tape 30 is likely to stick to the second end surface 20B.

  At the stage where the tape 30 is attached to the second end face 20B, a part of the tape 30 protrudes from the edge E of the first end face 20A. With the adhesive surface 30a attached to the second end surface 20B and the tape 30 protruding from the edge E of the first end surface 20A, the inclined surface 45 of the electrode pressing member 41 is a surface facing the adhesive surface 30a in the protruding portion. Become. The second end surface 20B is a facing surface facing the tape 30 among the surfaces connected to the first end surface 20A.

  As shown in FIG. 6, the second moving member 61 stops when the tape 30 contacts the second end surface 20B, whereas the third moving member 70 further moves the sticking member 63 toward the first end surface 20A. Let When the roller 67 contacts the tape 30, the tape 30 bends in the moving direction of the roller 67.

  When the roller 67 reaches the edge E of the first end surface 20A, the adhesive surface 30a of the tape 30 is pressed against the first end surface 20A by the roller 67. At the stage where the roller 67 reaches the edge E of the first end face 20A, the edge E of the first end face 20A is pressed by the electrode pressing member 41, so that the negative electrode 21 and the storage electrode 22 are bent due to the movement of the roller 67. It is suppressed.

  As shown in FIG. 7, the roller 67 moves along the first end surface 20A from the second end surface 20B side of the first end surface 20A. Therefore, the moving direction of the roller 67 when the tape 30 is attached is the direction in which the roller 67 moves along the first end surface 20A from the second end surface 20B side of the first end surface 20A. By driving the first moving member 42, the electrode pressing member 41 moves along the moving direction of the roller 67 on the downstream side in the moving direction of the roller 67. In the present embodiment, the electrode pressing member 41 moves in a direction that intersects the direction along the first end surface 20A and the stacking direction. The moving direction of the electrode pressing member 41 does not need to be completely coincident with the moving direction of the roller 67, and the moving direction can prevent sticking of the tape 30 to the electrode pressing member 41 due to the movement of the roller 67. If it is. That is, when only the direction along the first end surface 20A is considered without considering the movement in the stacking direction, the movement direction of the electrode pressing member 41 and the movement direction of the roller 67 may be the same.

  Then, when the roller 67 moves along the first end surface 20A, the roller 67 presses the tape 30 against the first end surface 20A. As a result, the tape 30 is attached to the electrode assembly 20.

Thereafter, the suction device is stopped so that no adsorption force is generated in the holding member 51, and the holding member 51 is separated from the second end face 20B.
Therefore, according to the above embodiment, the following effects can be obtained.

  (1) The roller 67 is attached to the first end face 20A by pressing the edge 30 of the first end face 20A in the stacking direction by the electrode pressing member 41 while the tape 30 is attached by the tape attaching device 40 of the electrode assembly. The negative electrode 21 and the storage electrode 22 can be rolled by sliding on the first end surface 20A by the roller 67 when moving along the first end surface 20A from the edge E of the first end surface 20A while pressing in the stacking direction. It is suppressed.

  (2) The electrode pressing member 41 includes an inclined surface 45. The inclined surface 45 is inclined so as to be separated from the virtual surface S as it is separated from the first end surface 20A in the stacking direction. The virtual surface S is a portion where the tape 30 to be attached to the first end surface 20A is located when the tape 30 is attached to the second end surface 20B. For this reason, when one surface of the electrode pressing member 41 is located on the same plane as the virtual surface S, the tape 30 may be attached to the electrode pressing member 41 when the tape 30 is applied to the second end surface 20B. However, since the one surface of the electrode pressing member 41 is the inclined surface 45, the tape 30 can be prevented from sticking to the electrode pressing member 41.

  (3) The first moving member 42 moves the electrode pressing member 41 in a direction that intersects both the direction along the first end surface 20A and the stacking direction. For this reason, when the electrode pressing member 41 is moved toward the edge E and when the electrode pressing member 41 is separated from the edge E, the electrode pressing member 41 hardly slides on the first end surface 20A. For this reason, damage to the first end face 20A due to the electrode pressing member 41 sliding on the first end face 20A is suppressed.

  (4) The holding member 51 holds the tape 30 by adsorbing the non-adhesive surface 30 b of the tape 30. By holding the tape 30 by suction, the tape 30 can be held without adhering the tape 30 to the holding member 51. When the tape 30 is detached from the holding member 51, the tape 30 can be easily detached by preventing the holding member 51 from generating an adsorption force by stopping the suction device or the like.

In addition, you may change embodiment as follows.
The electrode assembly tape attaching device 40 may have a configuration different from that of the embodiment. For example, as shown in FIG. 8, the electrode assembly tape attaching device 40 may be configured to include one electrode pressing member 41. In this case, the holding member 51 is disposed to face one first end face 20A. Further, the electrode pressing member 41 is disposed to face the first end surface 20A opposite to the first end surface 20A facing the holding member 51. The second moving member 61 linearly moves the rod 62 in a direction approaching the first end surface 20A and a direction away from the first end surface 20A. In this case, the tape applicator 40 of the electrode assembly is attached to the second end face 20B through the other second end face that becomes the second sticking face from the first end face 20A that becomes the first sticking face. The tape 30 is affixed to 20B.

  When the tape 30 is attached to the electrode assembly 20, the tape 30 is held by the holding member 51. When the rod 62 is protruded by driving the second moving member 61, the tape 30 is attached to the first end face 20A. The tape 30 is gripped by a gripping member (not shown), and the gripping member moves so as to stick the tape 30 to the second end surface 20B. Further, the gripping member moves so as to stick the tape 30 from the second end surface 20B to the first end surface 20A on the opposite side to the first end surface 20A on the holding member 51 side.

  At this time, the roller 67 and the electrode pressing member 41 move in the same manner as in the embodiment, so that the negative electrode 21 and the storage electrode 22 are prevented from being twisted. The negative electrode 21 and the storage electrode 22 are rolled when the roller 67 moves from the edge E along the first end face 20A, that is, from the outside of the first end face 20A toward the first end face 20A. This is the case. For this reason, the electrode pressing member 41 should just be provided at least on the movement track | orbit of the roller 67 which moves along 20 A of 1st end surfaces from the edge E of 20 A of 1st end surfaces.

  The electrode pressing member 41 may press the electrode assembly 20 in a state of being in contact with only the edge E of the first end surface 20A. In addition, you may make it the electrode press member 41 contact | connect only the edge E of 20 A of 1st end surfaces by making the shape of the electrode press member 41 into a shape different from embodiment. Alternatively, the electrode pressing member 41 may contact only the edge E of the first end surface 20A by adjusting the moving direction of the rod 46 so that the corner of the electrode pressing member 41 contacts the edge E.

  As shown in FIG. 9, in the storage electrode 22, the peripheral portion is thinner than the portion where the positive electrode 23 and the bag-like separator 24 overlap. For this reason, when the storage electrode 22 and the negative electrode 21 are laminated, a gap C is generated between the peripheral portions. The gap C can be easily filled by pressing only the edge E of the first end face 20A. In addition, the edge E here is a part which overlaps the clearance gap C in the lamination direction in the electrode assembly 20.

  As shown in FIG. 10, the electrode assembly tape attaching device 40 is an electrode moving mechanism that moves the electrode assembly 20 toward the holding member 51 instead of the holding member moving mechanism that moves the holding member 51. The fourth moving member 90 may be provided. That is, the electrode assembly tape attaching device 40 only needs to include a moving mechanism that relatively moves the electrode assembly 20 and the holding member 51 (tape 30).

  The fourth moving member 90 is an actuator such as an air cylinder. The fourth moving member 90 includes a rod 91. The fourth moving member 90 moves the holding jig 31 fixed to the projecting end of the rod 91 by the protrusion and withdrawal of the rod 91 in the cylinder tube. The electrode assembly 20 held by the holding jig 31 is movable toward the holding member 51 by the protrusion of the rod 91 by the fourth moving member 90. In addition, the electrode assembly 20 held by the holding jig 31 can move away from the holding member 51 by the immersion of the rod 91 by the fourth moving member 90.

  When affixing the tape 30 to the electrode assembly 20, the tape 30 is affixed to the second end surface 20B of the electrode assembly 20 by driving the fourth moving member 90. Thereafter, the tape 30 is affixed to the electrode assembly 20 by driving the first moving member 42 and the third moving member 70 as in the embodiment.

  The holding member 51 may hold the tape 30 with an adhesive force. In this case, the surface of the holding member 51 that holds the tape 30 is made adhesive. The adhesive force of the adhesive surface is such that the tape 30 is separated from the holding member 51 when the holding member 51 is separated after the tape 30 is attached to the electrode assembly 20.

The holding member 51 may not include the elastic body 54.
The electrode pressing member 41 may have a shape that does not include the inclined surface 45 such as a rectangular parallelepiped shape. In this case, it is preferable to prevent the tape 30 from adhering such that the surface of the electrode pressing member 41 that contacts the tape 30 has low friction.

  The first moving member 42 may move the electrode pressing member 41 along the first end surface 20A. In this case, it is preferable that the contact surface has low friction in order to suppress damage to the first end surface 20A due to the electrode pressing member 41 sliding on the first end surface 20A.

  In the embodiment, the same number of electrode assembly tape attaching devices 40 as the number of tapes 30 are provided, but the present invention is not limited thereto. It is sufficient that at least one tape attaching device 40 for the electrode assembly is provided. In this case, every time one tape 30 is applied, the tape attaching device 40 of the electrode assembly or the electrode assembly 20 is moved to apply the tapes 30 in order.

  A common electrode pressing member 41 may be provided for the plurality of pasting mechanisms 50. For example, when a plurality of tapes 30 are attached to one second end face 20B, a plurality of attaching mechanisms 50 are arranged facing the second end face 20B. In this case, one electrode pressing member 41 is provided on the track of the plurality of rollers 67 such as the electrode pressing member 41 extending over the entire edge of the first end face 20A.

The number of tapes 30 may be changed as appropriate.
The electrode pressing member 41 may press a portion different from the edge E, such as a portion slightly separated from the edge E in the first end surface 20A.

The electrode assembly 20 may include an insulating film for electrically insulating the case 11.
The tape pressing member may be a member other than the roller 67. For example, a member that does not rotate with movement, such as a rectangular parallelepiped member, may be used.

  The tape 30 may be attached without holding the electrode assembly 20 with the holding jig 31. Even in this case, since the electrode assembly 20 is pressed in the stacking direction by the electrode pressing member 41, the electrode assembly 20 is restricted from being separated.

  In the tape 30, the surface opposite to the adhesive surface 30a may be a surface having a lower adhesive strength than the adhesive surface 30a.

  E ... Edge, S ... Virtual surface, 20 ... Electrode assembly, 20A ... First end surface, 20B ... Second end surface, 21 ... Negative electrode (electrode), 22 ... Storage electrode (electrode), 30 ... Tape, 30a ... Adhesion Surface, 40 ... tape attaching device for electrode assembly, 41 ... electrode pressing member, 42 ... first moving member (electrode pressing member moving mechanism), 45 ... inclined surface, 51 ... holding member, 52 ... suction part, 61 ... Second moving member (holding member moving mechanism), 67 ... roller (tape pressing member), 70 ... third moving member (tape pressing member moving mechanism), 90 ... fourth moving member (electrode moving mechanism).

Claims (5)

In the electrode assembly having a plurality of stacked electrodes, the tape is applied in order from the first application surface to the second application surface over the first application surface and the second application surface, which are the outer surfaces of the electrode assembly. A tape attaching device for an electrode assembly to be attached,
A holding member for holding the tape in a state where the adhesive surface of the tape faces the first application surface;
A holding member moving mechanism for moving the holding member toward the first application surface, and attaching the tape to the first application surface;
A tape pressing member that presses the second pasting surface in the stacking direction of the electrodes via the tape;
When the surface facing the tape among the surfaces connected to the second application surface is an opposing surface, the tape pressing member is interposed through the surface opposite to the adhesive surface of the tape attached to the first application surface. The tape pressing member is moved along the second sticking surface from the opposite surface side of the second sticking surface in a state where the second sticking surface is pressed in the stacking direction, and the tape is moved to the second sticking surface. A tape pressing member moving mechanism to be affixed to the affixing surface;
An electrode pressing member for pressing the second sticking surface in the stacking direction;
The electrode pressing member is moved along the moving direction of the tape pressing member on the downstream side in the moving direction of the tape pressing member along with the movement of the tape pressing member along the second sticking surface by the tape pressing member moving mechanism. An electrode pressing member moving mechanism for making an electrode assembly tape affixing device. In the electrode assembly having a plurality of stacked electrodes, the tape is applied in order from the first application surface to the second application surface over the first application surface and the second application surface, which are the outer surfaces of the electrode assembly. A tape attaching device for an electrode assembly to be attached,
A holding member for holding the tape in a state where the adhesive surface of the tape faces the first application surface;
An electrode moving mechanism for moving the electrode assembly toward the holding member and affixing the tape to the first application surface;
A tape pressing member that presses the second pasting surface in the stacking direction of the electrodes via the tape;
When the surface facing the tape among the surfaces connected to the second application surface is an opposing surface, the tape pressing member is interposed through the surface opposite to the adhesive surface of the tape attached to the first application surface. The tape pressing member is moved along the second sticking surface from the opposite surface side of the second sticking surface in a state where the second sticking surface is pressed in the stacking direction, and the tape is moved to the second sticking surface. A tape pressing member moving mechanism to be affixed to the affixing surface;
An electrode pressing member for pressing the first pasting surface in the stacking direction;
The electrode pressing member is moved along the moving direction of the tape pressing member on the downstream side in the moving direction of the tape pressing member along with the movement of the tape pressing member along the second sticking surface by the tape pressing member moving mechanism. An electrode pressing member moving mechanism for making an electrode assembly tape affixing device. When the surface assumed to extend the facing surface in the stacking direction is a virtual surface,
In a state where the tape is attached to the facing surface, the electrode pressing member faces the adhesive surface protruding from the edge of the second application surface of the tape to the lamination method, and the laminate from the second application surface. The tape attaching device for an electrode assembly according to claim 1, further comprising an inclined surface that is inclined so as to be separated from the virtual surface as it is separated in the direction.   4. The electrode pressing member moving mechanism according to claim 1, wherein the electrode pressing member moving mechanism moves the electrode pressing member in a direction intersecting both the direction along the second pasting surface and the stacking direction. 5. Tape applicator for electrode assembly.   The tape attachment of the electrode assembly as described in any one of Claims 1-4 with which the said holding member is provided with the adsorption | suction part which hold | maintains the said tape by adsorb | sucking the surface on the opposite side to the said adhesion surface. Attachment device.

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