JP6699488B2 - Electrode stacking device - Google Patents

Description

  The present invention relates to an electrode stacking device.

  As a conventional electrode stacking device, for example, the device described in Patent Document 1 is known. The electrode stacking device described in Patent Document 1 includes a stacking device having a stacking part that stacks positive electrode plate sheets and negative electrode plates alternately, a negative electrode plate transport belt disposed on one side of the stacking part, and a negative electrode plate. A negative electrode plate supply device, which is arranged near the base end side of the conveyor belt and supplies the negative electrode plate to the negative electrode plate conveyor belt, and a positive electrode plate sheet conveyor belt arranged above the base end side of the negative electrode plate conveyor belt. ing. The accumulating unit rises in a direction perpendicular to the upper surface of the supporting substrate, the first side plate standing in a direction perpendicular to the upper surface of the supporting substrate, and the upper surface of the supporting substrate, and forms an angle with the first side plate at a right angle. And a second side plate that has become The negative electrode plate supplied from the negative electrode plate supply device is placed on the negative electrode plate transport belt, and the positive electrode plate sheet supplied by the positive electrode plate sheet transport belt falls and overlaps with the negative electrode plate. Then, the negative electrode plate and the positive electrode plate sheet in a state of being overlapped with each other jump out from the tip of the negative electrode plate transport belt and are stacked on the supporting substrate of the accumulating unit in a state of abutting against the first side plate of the accumulating unit.

JP, 2014-179304, A

  However, the above-mentioned conventional techniques have the following problems. That is, if the transport speed of the electrode to the stacking unit is increased in order to speed up the stacking of the negative electrode plate and the positive electrode plate sheet that are the electrodes, the impact when the electrode hits the first side plate of the stacking unit increases. , The electrodes are easily damaged. As a result, the powder of the active material provided on the surface of the electrode may fall off.

  An object of the present invention is to provide an electrode stacking device that can reduce electrode damage.

  An electrode stacking device of one embodiment of the present invention includes a stacking part in which positive electrodes and negative electrodes as electrodes are stacked alternately, and two pushers which are arranged so as to sandwich the stacking part and which respectively push out the positive electrode and the negative electrode toward the stacking part. And a control unit for controlling the pusher, the control unit is configured such that the acceleration of the pusher after the pusher contacts the electrode is greater than the acceleration of the pusher before the pusher contacts the electrode, and the pusher contacts the electrode. It is characterized by having a speed control unit for controlling the speed of the pusher so that the deceleration of the pusher when the electrode is separated from the pusher becomes smaller than the acceleration of the pusher after the operation.

  In such an electrode stacking device, the acceleration of the pusher after the pusher contacts the electrode is larger than the acceleration of the pusher before the pusher contacts the electrode, so that the pusher contacts the electrode at a low pusher speed. It will be. Therefore, the impact when the pusher contacts the electrode is small. Further, since the deceleration of the pusher when separating the electrode from the pusher is smaller than the acceleration of the pusher after the pusher comes into contact with the electrode, the electrode separates from the pusher while the pusher slowly decelerates. Therefore, the impact when the electrodes are stacked on the stacked portion is small. As described above, damage to the electrodes is reduced.

  The pusher has a pressing member that presses the electrode, and a contact portion that comes into contact with the electrode is provided at the tip of the pressing member, and the stacking portion stands on the base on which the electrode is placed and on the base. A first side wall that is provided to position the bottom edge of the electrode, and a pair of second side walls that stand upright on the base so as to face each other and that positions the side edges of the electrode. It may have a first slit through which the electrode pushed out by the pusher passes, and a second slit provided so as to intersect with the first slit and into which the contact portion enters. In such a configuration, when the pusher pushes the electrode toward the laminated portion, the electrode passes through the first slit of the second side wall and is laminated on the base. Therefore, the electrode can be stacked on the stacked portion without pushing the electrode toward the stacked portion so that the electrode passes above the second side wall. Therefore, the drop distance of the electrode in the laminated portion is shortened, and the impact when the electrode is laminated in the laminated portion is further reduced. This further reduces damage to the electrodes.

  The control unit stops one of the two pushers with the contact portion entering the second slit when one of the positive electrode and the negative electrode is extruded toward the laminated portion by one of the two pushers, and in that state, A timing control unit that controls the push-out timing of the pushers may be provided so that the other of the two pushers pushes the other of the positive electrode and the negative electrode toward the laminated portion. In this case, the contact portion functions as a receiving portion for the electrode when the electrode is pushed out toward the laminated portion by the pusher on the opposite side.

  The contact portion may be made of a cushioning material. In this case, the contact portion reduces the impact when the pusher pressing member presses the electrode. This further reduces the damage to the electrodes.

  When the one of the positive electrode and the negative electrode is pushed out toward the laminated portion by one of the two pushers, the timing control portion causes the contact portion to enter the second slit and the tip end surface of the contact portion to be more than the inner wall surface of the second side wall. The pusher push-out timing may be controlled so that one of the two pushers is stopped in the state of being located inside. In this case, when the electrode is pushed out toward the laminated portion by the pusher on the opposite side, the electrode does not hit the second side wall but hits the contact portion and is stacked on the base. This further reduces the damage to the electrodes.

  According to the present invention, damage to the electrodes can be reduced.

It is sectional drawing which shows the inside of the electrical storage apparatus manufactured by applying the electrode lamination apparatus which concerns on embodiment of this invention. It is the II-II sectional view taken on the line of FIG. It is a side view (a partial cross section is included) which shows the electrode lamination device which concerns on one Embodiment of this invention. It is a perspective view which shows the external appearance of the lamination|stacking part shown by FIG. It is a schematic plan view which shows a mode that an electrode is pushed toward a laminated part by the positive electrode pusher and the negative electrode pusher shown in FIG. FIG. 6 is a cross-sectional view showing how the pressing member shown in FIG. 5 stacks electrodes on a stacking portion. It is the VII-VII sectional view taken on the line of FIG. It is a graph which shows the speed pattern of the pusher in this embodiment. It is a graph which shows the speed pattern of the pusher as a comparative example. FIG. 9 is a schematic plan view showing a modified example of the movement path of the pressing member of the positive electrode pusher shown in FIG. 5.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or equivalent elements will be denoted by the same reference symbols, without redundant description.

  FIG. 1 is a cross-sectional view showing the inside of a power storage device manufactured by applying an electrode stacking device according to an embodiment of the present invention. 2 is a sectional view taken along the line II-II in FIG. 1 and 2, the power storage device 1 is a lithium-ion secondary battery having a laminated electrode assembly.

  The power storage device 1 includes a case 2 having a substantially rectangular parallelepiped shape, for example, and an electrode assembly 3 housed in the case 2. The case 2 is made of metal such as aluminum. Although not shown, for example, a nonaqueous (organic solvent) electrolytic solution is injected into the case 2. The case 2 is composed of a case body 2a having an opening at the top and a lid 2b fixed to the case body 2a by welding so as to close the opening. On the lid 2b, the positive electrode terminal 4 and the negative electrode terminal 5 are arranged separately from each other. The positive electrode terminal 4 is fixed to the lid 2b via an insulating ring 6, and the negative electrode terminal 5 is fixed to the lid 2b via an insulating ring 7. Although not shown, for example, an insulating film is disposed between the electrode assembly 3 and the inner side surface and bottom surface of the case 2, and the insulating film insulates the case 2 and the electrode assembly 3 from each other. ing.

  The electrode assembly 3 has a structure in which a plurality of positive electrodes 8 and a plurality of negative electrodes 9 are alternately stacked with a bag-shaped separator 10 interposed therebetween. The positive electrode 8 is wrapped in a bag-shaped separator 10. The positive electrode 8 wrapped in the bag-shaped separator 10 is configured as a positive electrode 11 with a separator. Therefore, the electrode assembly 3 has a structure in which the positive electrodes 11 with separators and the negative electrodes 9 are alternately stacked. The electrodes located at both ends of the electrode assembly 3 are the negative electrodes 9.

  The positive electrode 8 has a metal foil 14 made of, for example, an aluminum foil, and a positive electrode active material layer 15 formed on both surfaces of the metal foil 14. The metal foil 14 has a foil main body 14a having a rectangular shape in a plan view and a tab 14b integrated with the foil main body 14a. The tab 14b projects from the edge of the foil body 14a in the vicinity of one end in the longitudinal direction and penetrates the separator 10. The tab 14b is connected to the positive electrode terminal 4 via the conductive member 12. In FIG. 2, the tab 14b is omitted for convenience.

  The positive electrode active material layer 15 is formed on both surfaces of the foil body 14a. The positive electrode active material layer 15 is a porous layer including a positive electrode active material and a binder. Examples of the positive electrode active material include complex oxides, metallic lithium, sulfur and the like. The composite oxide contains, for example, at least one of manganese, nickel, cobalt, and aluminum and lithium.

  The negative electrode 9 has a metal foil 16 made of, for example, a copper foil, and a negative electrode active material layer 17 formed on both surfaces of the metal foil 16. The metal foil 16 has a foil main body 16a having a rectangular shape in plan view and a tab 16b integrated with the foil main body 16a. The tab 16b projects from an edge near one end of the foil body 16a in the longitudinal direction. The tab 16b is connected to the negative electrode terminal 5 via the conductive member 13. Note that the tab 16b is omitted in FIG. 2 for convenience.

  The negative electrode active material layer 17 is formed on both surfaces of the foil body 16a. The negative electrode active material layer 17 is a porous layer formed containing a negative electrode active material and a binder. Examples of the negative electrode active material include graphite, highly oriented graphite, carbon such as mesocarbon microbeads, hard carbon and soft carbon, alkali metals such as lithium and sodium, metal compounds, SiOx (0.5≦x≦1.5). ) And other metal oxides or boron-added carbon.

  The separator 10 has a rectangular shape in plan view. Examples of the material of the separator 10 include a porous film made of a polyolefin resin such as polyethylene (PE) and polypropylene (PP), or a woven or non-woven fabric made of polypropylene, polyethylene terephthalate (PET), methyl cellulose and the like.

  When manufacturing the electricity storage device 1 configured as described above, first, the positive electrode 11 with a separator and the negative electrode 9 are first manufactured, and then the positive electrode 11 with a separator and the negative electrode 9 are alternately stacked to form the positive electrode 11 with a separator and the negative electrode 9 Is fixed with a tape or the like to obtain the electrode assembly 3. Then, in a state where the lid 2b of the case 2, the conductive members 12 and 13, the positive electrode terminal 4 and the negative electrode terminal 5 are assembled and integrated in advance, the tab 14b of the positive electrode 11 with a separator is connected to the positive electrode terminal 4 via the conductive member 12. At the same time, the tab 16b of the negative electrode 9 is connected to the negative electrode terminal 5 via the conductive member 13. Then, the electrode assembly 3 is housed in the case body 2a, and the case body 2a and the lid 2b are welded together.

  FIG. 3 is a side view (including a partial cross section) showing an electrode stacking device according to an embodiment of the present invention. The electrode stacking device 20 of the present embodiment is a device that stacks positive electrodes 11 with separators and negative electrodes 9 alternately.

  The electrode stacking device 20 includes a positive electrode transport unit 21, a negative electrode transport unit 22, a positive electrode supply conveyor 23, a negative electrode supply conveyor 24, and a stacking unit 25. The positive electrode transport unit 21 and the negative electrode transport unit 22 are arranged side by side in the X direction.

  The positive electrode transport unit 21 is a unit that sequentially transports while storing the positive electrode 11 with the separator. The positive electrode transport unit 21 has a loop-shaped circulating member 26 extending in the up-down direction (Z direction), and a plurality of U-shaped support portions 27 attached to the outer peripheral surface of the circulating member 26 and supporting the positive electrode 11 with a separator. And a drive unit 28 that drives the circulation member 26. The Z direction is a direction perpendicular to the X direction.

  The circulation member 26 is composed of, for example, an endless belt. The circulation member 26 is bridged over two pulleys 26a that are arranged apart from each other in the vertical direction, and is rotated along with the rotation of each pulley 26a. By rotating (circulating) the circulation member 26 in this manner, each support portion 27 cyclically moves. Further, the circulation member 26 is movable in the vertical direction.

  The drive unit 28 rotates the circulation member 26 and moves the circulation member 26 in the vertical direction. At this time, the drive unit 28 rotates the circulation member 26 in the clockwise direction (the direction of the arrow in the drawing) when viewed from the front side of the electrode stacking device 20 (the front side of the paper surface of FIG. 3). Therefore, the support portion 27 on the positive electrode supply conveyor 23 side rises with respect to the circulation member 26, and the support portion 27 on the stacking unit 25 side descends with respect to the circulation member 26. The front-back direction of the electrode stacking device 20 is the Y direction perpendicular to the X direction and the Z direction.

  The negative electrode transport unit 22 is a unit that sequentially transports while storing the negative electrode 9. The negative electrode transport unit 22 includes a loop-shaped circulation member 29 extending in the vertical direction (Z direction), a plurality of support portions 30 attached to the outer peripheral surface of the circulation member 29 and having a U-shaped cross section for supporting the negative electrode 9. It has the drive part 31 which drives the circulation member 29.

  The circulation member 29 is composed of, for example, an endless belt like the circulation member 26. The circulation member 29 is bridged over two pulleys 29a that are vertically separated from each other, and is rotated along with the rotation of each pulley 29a. By rotating (circulating) the circulation member 29 in this manner, each support portion 30 cyclically moves. Further, the circulation member 29 is movable in the vertical direction.

  The drive unit 31 rotates the circulation member 29 and moves the circulation member 29 in the vertical direction. At this time, the drive unit 31 rotates the circulation member 29 counterclockwise (in the direction of the arrow in the figure) when viewed from the front side of the electrode stacking device 20 (the front side of the plane of FIG. 3). Therefore, the support portion 30 on the negative electrode supply conveyor 24 side rises with respect to the circulation member 29, and the support portion 30 on the stacking unit 25 side descends with respect to the circulation member 29.

  The positive electrode supply conveyor 23 horizontally conveys the positive electrode 11 with separator toward the positive electrode transport unit 21, and supplies the positive electrode 11 with separator to the support portion 27 of the positive electrode transport unit 21. The positive electrode supply conveyor 23 has a plurality of claw portions 32 provided at equal intervals along the circulation direction of the positive electrode supply conveyor 23. The claw portion 32 comes into contact with the end portion of the separator-attached positive electrode 11 on the rear side in the transport direction. Therefore, the positive electrode 11 with the separator is supplied to the positive electrode transport unit 21 at regular intervals.

  The negative electrode supply conveyor 24 horizontally transfers the negative electrode 9 toward the negative electrode transfer unit 22, and supplies the negative electrode 9 to the support portion 30 of the negative electrode transfer unit 22. The negative electrode supply conveyor 24 has a plurality of claw portions 33 provided at equal intervals along the circulation direction of the negative electrode supply conveyor 24. The claw portion 33 contacts the end portion of the negative electrode 9 on the rear side in the transport direction. Therefore, the negative electrode 9 is supplied to the negative electrode transport unit 22 at regular intervals.

  The stacking unit 25 is arranged between the positive electrode transport unit 21 and the negative electrode transport unit 22. The lamination unit 25 includes a plurality of layers (four layers in this case) of laminated portions 34 in which the separator-attached positive electrodes 11 and the negative electrodes 9 are alternately laminated, and a driving portion 35 that moves the laminated portions 34 in the vertical direction. have. The configuration of the laminated portion 34 will be described in detail later.

  Further, the electrode stacking device 20 includes a positive electrode pusher 36 and a negative electrode pusher 37 which are arranged so as to sandwich each stacking portion 34 of the stacking unit 25.

  The positive electrode pusher 36 simultaneously pushes out a plurality of (four in this case) positive electrodes 11 with separators toward the four-stage stacked portion 34. The positive electrode pusher 36 includes a pair of pressing members 38 (see FIG. 5) that press the four separator-attached positive electrodes 11 together, and a drive unit 39 that moves the pressing members 38 so that they can move back and forth with respect to the stacking unit 34. is doing. The configuration of the positive electrode pusher 36 will be described in detail later.

  The negative electrode pusher 37 simultaneously pushes out a plurality of (four in this case) negative electrodes 9 toward the four-stage stacked portion 34. The negative electrode pusher 37 has a pair of pressing members 40 (see FIG. 5) that press the four negative electrodes 9 together, and a drive unit 41 that moves the pressing members 40 so that they can move back and forth with respect to the stacking unit 34. There is. The configuration of the negative electrode pusher 37 will be described in detail later.

  The positive electrode transport unit 21 and the negative electrode transport unit 22 perform periodical drive, for example, intermittent drive, in synchronization with the interval at which the positive electrode 11 with a separator or the negative electrode 9 is supplied. The normal operation state of the positive electrode transport unit 21 and the negative electrode transport unit 22 includes three states of a circulation operation, a stacking operation, and a return operation. The description of the operating state in the case of an abnormality, for example, when there is a shortage in the electrode supply from the positive electrode supply conveyor 23 and the negative electrode supply conveyor 24 will be omitted here.

  The operation state of the negative electrode transport unit 22 will be described below, but the operation of the positive electrode transport unit 21 is the same. In this example, it is easy to understand that the negative electrode transport unit 22 is driven intermittently, and the support portion 30 is moved during a period in which the negative electrode 9 supplied from the negative electrode supply conveyor 24 is not being transferred. This period is defined as a unit travel time. In addition, the distance that the supporting portion 30 on the negative electrode supply conveyor 24 side moves in a unit moving time, that is, the interval between the supporting portions 30 is defined as a unit distance.

  In the circulation operation, the circulation member 29 only rotates (circulates) by intermittent driving. At this time, the height of the circulation member 29 is constant. The operation performed immediately after the operation (initial operation) is an operation of transporting the negative electrode 9 supported by the supporting portion 30 to a position where the negative electrode 9 supported by the supporting portion 30 can be extruded to the laminating portion 34 from a state where the negative electrode 9 is not present in the electrode stacking device 20. is there.

  The laminating operation is an operation of pushing out the negative electrode 9 supported by the supporting portion 30 to the laminating portion 34 on the side facing the laminating portion 34. On the side facing the laminated portion 34, the support portion 30 is stopped so that the negative electrode 9 can be pushed out. On the other hand, on the side facing the negative electrode supply conveyor 24, the negative electrode 9 is sequentially transferred from the negative electrode supply conveyor 24 to the support part 30 while moving the support part 30. Specifically, the circulation member 29 is circulated by 1/2 of the unit distance within the unit movement time, and at the same time, the circulation member 29 is raised by the same distance. As a result, the support section 30 stops on the side facing the stacking section 34, and the support section 30 rises by a unit distance on the side facing the negative electrode supply conveyor 24.

  In the returning operation, the circulating member 29 that has risen during the stacking operation is lowered, that is, returned to the original position, and the support portion 30 on which the negative electrode 9 is supported faces the stacking portion 34 so as to be stackable. It is an operation to move to. Therefore, the circulation member 29 is lowered within the unit movement time, and the circulation member 29 is circulated by an amount obtained by adding the unit distance to the descending amount of the circulation member 29. The descending amount of the circulation member 29 depends on the number of sheets to be laminated at one time in one lamination, the time required for the lamination, and the like. In this example, on the side facing the stacking unit 34, the supporting unit 30 is lowered by 4 unit distances within the unit moving time, and on the side facing the negative electrode supply conveyor 24, the supporting unit 30 is moved within the unit moving time. It is raised by the unit distance. For this purpose, the circulating member 29 is lowered by 1.5 unit moving distance, and the circulating member 29 is circulated by 2.5 unit moving distance.

  In the above, during the initial operation (during circulation operation), the positive electrode 11 with the separator transferred from the positive electrode supply conveyor 23 to the support portion 27 of the positive electrode transport unit 21 is temporarily raised by the rotation of the circulation member 26. Circularly move to descend. At this time, the front and back of the separator-attached positive electrode 11 are reversed at the upper part of the circulation member 26. Further, the negative electrode 9 transferred from the negative electrode supply conveyer 24 to the support portion 30 of the negative electrode transport unit 22 circulates so as to rise once and then descend by the rotation of the circulation member 29. At this time, the front and back of the negative electrode 9 are reversed at the upper part of the circulation member 29. Then, the positive electrode 11 with the separator and the negative electrode 9 are conveyed to a position where they can be stacked on the four-stage stacking section 34 of the stacking unit 25.

  During the laminating operation, the height position of the supporting portion 27 facing the laminating portion 34 becomes constant. In that state, the positive electrodes 11 with separators are simultaneously extruded by the positive electrode pusher 36 toward the four stacked layers 34, whereby the positive electrodes 11 with separators are stacked simultaneously on the respective stacked parts 34. The separator-attached positive electrode 11 is stacked on the stacking portion 34, and after the positive electrode pusher 36 returns to its original position, the returning operation is performed. In the returning operation, the support portion 27 supporting the positive electrode 11 with the separator is moved to a position facing the laminated portion 34. The same applies to the operation until the negative electrode 9 is laminated on each laminated portion 34.

  FIG. 4 is a perspective view showing the outer appearance of the laminated portion 34 of the laminated unit 25 described above. In FIG. 4, the laminated portion 34 is a base 42 having a rectangular shape in plan view on which the positive electrode 11 with a separator and the negative electrode 9 are mounted, and is erected on the edge of the base 42, and the positive electrode 11 with a separator and the negative electrode 9 are provided. And a positioning side plate 43 having a U-shaped cross section for positioning.

  The positioning side plate 43 is erected on one edge of the base 42 and positions the side wall 44 (the first edge 11a of the separator-attached positive electrode 11 (see FIG. 5) and the bottom edge 9a of the negative electrode 9 (see FIG. 5)). 1 side wall) and two side edges of the base 42 are erected so as to face each other, and the side edge 11b (see FIG. 5) of the positive electrode 11 with a separator and the side edge 9b (see FIG. 5) of the negative electrode 9 are positioned. Side walls 45 and 46 (a pair of second side walls). The bottom edge 11a of the positive electrode 11 with a separator is an edge on the side opposite to the tab 14b in the positive electrode 11 with a separator. The bottom edge 9a of the negative electrode 9 is an edge of the negative electrode 9 opposite to the tab 16b.

  The side wall 45 is provided so as to intersect with a slit 47 (first slit) through which the positive electrode 11 with a separator pushed out by the positive electrode pusher 36 passes, in a direction perpendicular to the slit 47, and a contact portion 54 of the positive electrode pusher 36 ( It has two slits 48 (second slits) into which a later-described portion is inserted. The slit 47 extends in the depth direction (Y direction) of the laminated portion 34. The slit 48 extends in the height direction (Z direction) of the laminated portion 34.

  The side wall 46 is provided so as to intersect with a slit 49 (first slit) through which the negative electrode 9 pushed out by the negative electrode pusher 37 passes in a direction perpendicular to the slit 49, and a contact portion 58 (described later) of the negative electrode pusher 37. Has two slits 50 (second slit). The slit 49 extends in the depth direction (Y direction) of the laminated portion 34. The slit 50 extends in the height direction (Z direction) of the laminated portion 34.

  FIG. 5 is a schematic plan view showing the positive electrode pusher 36 and the negative electrode pusher 37 described above together with the laminated portion 34. In FIG. 5, the positive electrode pusher 36 has the pair of pressing members 38 and the drive unit 39 as described above. The drive unit 39 includes a cylinder 39a, a main rod 51 that can be expanded and contracted by the cylinder 39a, and an L-shaped rod-shaped body 52 connected to the main rod 51. The pressing member 38 is fixed to the tips of the main rod 51 and the rod-shaped body 52, extends in the up-down direction, and is attached to the base portion 53 that corresponds to the four-tier laminated portion 34, and the positive electrode 11 with the separator. It has a plurality of (here, four) contact portions 54 that contact one side edge 11b. That is, the contact portion 54 is provided at the tip of the pressing member 38.

  The contact portion 54 is formed of a cushioning material such as sponge, rubber or resin. The contact portions 54 are arranged at equal intervals in the vertical direction (Z direction) corresponding to the height position of each laminated portion 34. As shown in FIGS. 6 and 7, the contact portion 54 has a quadrangular prism shape so as to extend in the vertical direction. The contact portion 54 enters the slit 48 provided in the side wall 45 of the laminated portion 34. The thickness of the contact portion 54 is larger than the thickness of the side wall 45.

  As described above, the negative electrode pusher 37 has the pair of pressing members 40 and the drive unit 41. The drive unit 41 includes a cylinder 41a, a main rod 55 that can be expanded and contracted by the cylinder 41a, and an L-shaped rod-shaped body 56 connected to the main rod 55. The pressing member 40 is fixed to the tips of the main rod 55 and the rod-shaped body 56, respectively, and extends in the up-down direction. It has a plurality of (here, four) contact portions 58 that come into contact with the side edges 9b. That is, the contact portion 58 is provided at the tip of the pressing member 40.

  The contact portion 58 is formed of the same cushioning material as the contact portion 54. The contact portions 58 are arranged at equal intervals in the vertical direction (Z direction) corresponding to the height position of each laminated portion 34. The shape and dimensions of the contact portion 58 are similar to those of the contact portion 54. The contact portion 58 enters the slit 50 provided on the side wall 46 of the laminated portion 34.

  Returning to FIG. 3, the electrode stacking device 20 further includes a control unit 60. The control unit 60 is composed of a CPU, a RAM, a ROM, an input/output interface and the like. The control unit 60 controls the drive unit 28 of the positive electrode transport unit 21, the drive unit 31 of the negative electrode transport unit 22, the drive unit 35 of the stacking unit 25, the drive unit 39 of the positive electrode pusher 36, and the drive unit 41 of the negative electrode pusher 37. Here, the description of the control of the drive units 28, 31, 35 by the control unit 60 will be omitted.

  The control unit 60 has a speed controller 61 and a timing controller 62. The speed control unit 61 controls the driving units 39 and 41 so as to control the pushing speed of the positive electrode pusher 36 and the negative electrode pusher 37 according to the speed pattern as shown in FIG.

  FIG. 8 is a graph showing a pusher speed pattern in this embodiment. The horizontal axis of the graph represents the stroke of the pusher in the electrode pushing direction, and the vertical axis of the graph represents the pusher speed. S1 in the graph is the position where the pusher contacts the electrode, and S2 in the graph is the position of the push-out end of the electrode by the pusher.

  Specifically, the speed control unit 61 controls the positive electrode after the positive electrode pusher 36 contacts the separator-attached positive electrode 11 rather than the acceleration (see the region P) of the positive electrode pusher 36 before the positive electrode pusher 36 contacts the separator-attached positive electrode 11. When the acceleration of the pusher 36 (see area Q) increases and the positive electrode with separator 11 is separated from the positive electrode pusher 36 after the positive electrode pusher 36 contacts the positive electrode with separator 11 (see area Q). The speed of the positive electrode pusher 36 is controlled so that the deceleration of the positive electrode pusher 36 (see region R) becomes small.

  In addition, the speed controller 61 accelerates the negative electrode pusher 37 after the negative electrode pusher 37 contacts the negative electrode 9 (region Q) more than the acceleration of the negative electrode pusher 37 before the negative electrode pusher 37 contacts the negative electrode 9 (see region P). The acceleration of the negative electrode pusher 37 after the negative electrode pusher 37 contacts the negative electrode 9 (see the area Q) and the deceleration of the negative electrode pusher 37 when the negative electrode 9 is separated from the negative electrode pusher 37 (see the area R). The speed of the negative electrode pusher 37 is controlled so that) becomes small.

  The timing control unit 62 controls the driving units 39 and 41 so as to control the push-out timing of the positive electrode pusher 36 and the negative electrode pusher 37.

  Specifically, as shown in FIGS. 6 and 7, when the positive electrode pusher 36 pushes the separator-attached positive electrode 11 toward the laminated portion 34, the timing controller 62 causes the contact portion 54 to slit the side wall 45. The positive electrode pusher 36 is stopped in a state where the positive electrode pusher 36 enters the position 48, and the pushing timing of the positive electrode pusher 36 and the negative electrode pusher 37 is controlled so that the negative electrode pusher 37 pushes the negative electrode 9 toward the laminated portion 34 in this state.

  At this time, as shown in FIG. 6, when the positive electrode pusher 36 pushes out the separator-attached positive electrode 11 toward the laminated portion 34, the timing control portion 62 causes the contact portion 54 to enter the slit 48 of the side wall 45 and make contact. The push-out timing of the positive electrode pusher 36 is controlled so that the positive electrode pusher 36 is stopped in a state where the front end surface 54a of the portion 54 is located inside the inner wall surface 45a of the side wall 45 (on the side wall 46 side).

  When the negative electrode pusher 37 pushes the negative electrode 9 toward the laminated portion 34, the timing controller 62 stops the negative electrode pusher 37 with the contact portion 58 entering the slit 50 of the side wall 46, and in that state. The extrusion timing of the positive electrode pusher 36 and the negative electrode pusher 37 is controlled so that the positive electrode pusher 36 pushes the positive electrode 11 with the separator toward the laminated portion 34.

  At this time, when the negative electrode pusher 37 pushes the negative electrode 9 toward the laminated portion 34, the timing control portion 62 causes the contact portion 58 to enter the slit 50 of the side wall 46 and the tip surface 58 a of the contact portion 58 to reach the side wall 46. The push-out timing of the negative electrode pusher 37 is controlled so that the negative electrode pusher 37 is stopped in a state of being located inside the inner wall surface 46a (on the side wall 45 side).

  FIG. 9 is a graph showing an example of a pusher speed pattern as a comparative example. The horizontal and vertical axes of the graph and S1 and S2 in the graph are the same as those in the graph of FIG. The velocity pattern shown in FIG. 9 is such that when the pusher rapidly accelerates so that the velocity of the pusher reaches the maximum velocity value immediately before the pusher comes into contact with the electrode, and then the electrode is separated from the pusher, the pusher moves from the maximum velocity value. It is set to suddenly slow down. At this time, the acceleration of the pusher immediately before the pusher comes into contact with the electrode is equal to the deceleration of the pusher when the electrode is separated from the pusher.

  However, if the speeds of the positive electrode pusher 36 and the negative electrode pusher 37 are controlled according to the speed pattern as shown in FIG. 9, the following problems occur. That is, immediately before the positive electrode pusher 36 contacts the positive electrode 11 with the separator, the speed of the positive electrode pusher 36 reaches the maximum value, so that the positive electrode pusher 36 contacts the positive electrode 11 with the separator in the high speed region. Therefore, the impact when the positive electrode pusher 36 comes into contact with the positive electrode 11 with the separator becomes large. Further, when the positive electrode with separator 11 is separated from the positive electrode pusher 36, the positive electrode pusher 36 rapidly decelerates, so that the positive electrode with separator 11 vigorously contacts the laminated portion 34. Therefore, the impact when the positive electrode 11 with the separator comes into contact with the laminated portion 34 becomes large. As a result, the damage on the separator-attached positive electrode 11 increases. The same applies when the negative electrode 9 is pushed out toward the laminated portion 34 by the negative electrode pusher 37.

  On the other hand, in this embodiment, since the acceleration of the positive electrode pusher 36 after the positive electrode pusher 36 contacts the separator-attached positive electrode 11 is larger than the acceleration of the positive electrode pusher 36 before the positive electrode pusher 36 contacts the separator-attached positive electrode 11, While the speed of the positive electrode pusher 36 is low, the positive electrode pusher 36 comes into contact with the positive electrode 11 with the separator. Therefore, the impact when the positive electrode pusher 36 contacts the separator-attached positive electrode 11 is small. Further, the deceleration of the positive electrode pusher 36 when separating the positive electrode 11 with the separator from the positive electrode pusher 36 is smaller than the acceleration of the positive electrode pusher 36 after the positive electrode pusher 36 contacts the positive electrode 11 with the separator. The positive electrode 11 with the separator is separated from the positive electrode pusher 36 in the decelerated state. Therefore, the impact when the separator-attached positive electrode 11 is laminated on the laminated portion 34 is small. The same applies when the negative electrode 9 is pushed out toward the laminated portion 34 by the negative electrode pusher 37. As described above, damage to the separator-attached positive electrode 11 and the negative electrode 9 is reduced. As a result, powder drop of the positive electrode active material of the positive electrode 11 with a separator and the negative electrode active material of the negative electrode 9 is reduced. Therefore, it is possible to increase the capacity of the power storage device 1 and avoid lithium deposition in the power storage device 1.

  Further, in the present embodiment, when the positive electrode with separator 11 is extruded toward the laminated portion 34 by the positive electrode pusher 36, the positive electrode with separator 11 passes through the slit 47 of the side wall 45 and is laminated on the base 42. Therefore, the positive electrode with separator 11 can be stacked on the stacked portion 34 without pushing the positive electrode with separator 11 toward the stacked portion 34 so that the positive electrode 11 with separator passes above the side wall 45. Therefore, the falling distance of the separator-attached positive electrode 11 in the laminated portion 34 becomes short, and the impact when the separator-attached positive electrode 11 is laminated on the laminated portion 34 is further reduced. The same applies when the negative electrode 9 is pushed out toward the laminated portion 34 by the negative electrode pusher 37. This further reduces damage to the positive electrode 11 with the separator and the negative electrode 9.

  Further, in the present embodiment, when the positive electrode 11 with a separator is pushed out toward the laminated portion 34 by the positive electrode pusher 36, the positive electrode pusher 36 is stopped with the contact portion 54 entering the slit 48 of the side wall 45, and the state Then, the negative electrode 9 is pushed out toward the laminated portion 34 by the negative electrode pusher 37. At this time, the contact portion 54 functions as a receiving portion for the negative electrode 9 when the negative electrode 9 is pushed out toward the laminated portion 34 by the negative electrode pusher 37. When the negative electrode pusher 37 pushes the negative electrode 9 toward the laminated portion 34 in the reverse order, the negative electrode pusher 37 is stopped with the contact portion 58 entering the slit 50 of the side wall 46. The positive electrode 11 with a separator may be extruded toward the laminated portion 34 by the positive electrode pusher 36. At this time, the contact portion 58 functions as a receiving portion for the positive electrode with separator 11 when the positive electrode with separator 11 pushes the positive electrode with separator 11 toward the laminated portion 34.

  Further, in the present embodiment, since the contact portions 54 and 58 are formed of the cushioning material, the contact portion 54 absorbs the impact when the pressing member 38 of the positive electrode pusher 36 presses the positive electrode 11 with the separator, and the negative electrode The contact portion 58 absorbs an impact when the pressing member 40 of the pusher 37 presses the negative electrode 9. This further reduces damage to the positive electrode 11 with separator and the negative electrode 9.

  Further, in the present embodiment, when the positive electrode 11 with a separator is pushed out toward the laminated portion 34 by the positive electrode pusher 36, the contact portion 54 enters the slit 48 of the side wall 45 and the tip end surface 54 a of the contact portion 54 becomes the side wall 45. The positive electrode pusher 36 is stopped in a state of being located inside the inner wall surface 45a. At this time, when the negative electrode 9 is pushed out toward the laminated portion 34 by the negative electrode pusher 37, the negative electrode 9 hits the contact portion 54 without hitting the side wall 45 and is stacked on the base 42. As a result, damage to the negative electrode 9 is further reduced. Further, when the negative electrode 9 is pushed out toward the laminated portion 34 by the negative electrode pusher 37, the contact portion 58 enters the slit 50 of the side wall 46, and the tip surface 58 a of the contact portion 58 is located inside the inner wall surface 46 a of the side wall 46. The negative electrode pusher 37 is stopped in the positioned state. At this time, when the positive electrode 11 with a separator is pushed out toward the laminated portion 34 by the positive electrode pusher 36, the positive electrode 11 with a separator hits the contact portion 58 without hitting the side wall 46 and is stacked on the base 42. Thereby, the damage to the positive electrode 11 with the separator is further reduced.

  The present invention is not limited to the above embodiment. For example, in the above-described embodiment, the drive unit 39 of the positive electrode pusher 36 has the cylinder 39a, and the drive unit 41 of the negative electrode pusher 37 has the cylinder 41a. The present invention is not limited to this, and may have a motor, a link mechanism, or the like instead of the cylinder.

  In addition, in the above-described embodiment, the pair of pressing members 38 in the positive electrode pusher 36 are simultaneously driven by the single driving unit 39, but the present invention is not limited to this form, and the positive electrode pusher 36 includes the pair of pressing members 38. You may have two drive parts which each drive independently. In this case, the pair of pressing members 38 are synchronously driven by the two driving units. The same applies to the negative electrode pusher 37.

  At this time, for example, as shown in FIG. 10, the moving paths of the pair of L-shaped pressing members 70 do not have to be particularly parallel, and the moving path K1 of one pressing member 70 is the other pressing member 70. May be inclined with respect to the movement route K2.

  Further, in the above-described embodiment, the positive electrode 11 with separator is extruded by the pair of pressing members 38 and the negative electrode 9 is extruded by the pair of pressing members 40. If it is large, each of the positive electrode 11 with the separator and the negative electrode 9 may be extruded by one pressing member.

  Further, in the above embodiment, the electrode stacking device 20 includes the positive electrode transport unit 21 and the negative electrode transport unit 22, and the positive electrode 11 with the separator transported by the positive electrode transport unit 21 is extruded toward the stacking section 34 by the positive electrode pusher 36. At the same time, the negative electrode 9 transported by the negative electrode transport unit 22 is extruded toward the laminated portion 34 by the negative electrode pusher 37, but the configuration is not particularly limited thereto. The present invention can also be applied to an electrode stacking apparatus that pushes out an electrode, which is conveyed by, for example, a P&P (pick and place) method, toward a stacking section by a pusher.

  Further, in the above-described embodiment, the positive electrode 8 with a separator and the negative electrode 9 in a state where the positive electrode 8 is wrapped in the bag-shaped separator 10 are alternately laminated on the laminated portion 34. It is also applicable to an electrode stacking device in which negative electrodes with a separator in a state of being wrapped in a bag-shaped separator are alternately stacked in a stacking portion.

  Furthermore, although the power storage device 1 is a lithium-ion secondary battery in the above-described embodiment, the present invention is not limited to a lithium-ion secondary battery in particular, and other secondary batteries such as a nickel-hydrogen battery, an electric double layer, for example. It is also applicable to stacking electrodes in a power storage device such as a capacitor or a lithium ion capacitor.

  9... Negative electrode (electrode), 9a... Bottom edge, 9b... Side edge, 11... Separator positive electrode (electrode), 11a... Bottom edge, 11b... Side edge, 20... Electrode laminating device, 34... Laminating part, 36... Positive electrode Pusher, 37... Negative electrode pusher, 38... Pressing member, 40... Pressing member, 42... Base, 44... Side wall (first side wall), 45... Side wall (second side wall), 45a... Inner wall surface, 46... Side wall (first side) 2 side walls), 46a... inner wall surface, 47... slit (first slit), 48... slit (second slit), 49... slit (first slit), 50... slit (second slit), 54... contact portion, 54a... Tip surface, 58... Contact portion, 58a... Tip surface, 60... Control unit, 61... Speed control section, 62... Timing control section.

Claims (5)

A laminated portion in which positive electrodes and negative electrodes as electrodes are alternately laminated,
Two pushers which are arranged so as to sandwich the laminated portion and which push out the positive electrode and the negative electrode respectively toward the laminated portion,
A control unit for controlling the pusher,
The control unit is configured such that the acceleration of the pusher after the pusher contacts the electrode becomes larger than the acceleration of the pusher before the pusher contacts the electrode, and the acceleration of the pusher after the pusher contacts the electrode An electrode stacking device comprising a speed control unit that controls the speed of the pusher so that the deceleration of the pusher when the electrode is separated from the pusher is smaller than the acceleration of the pusher. The pusher has a pressing member for pressing the electrode,
The tip of the pressing member is provided with a contact portion that comes into contact with the electrode,
The laminated portion is a base on which the electrode is placed, a first side wall that is erected on the base and positions the bottom edge of the electrode, and is erected on the base so as to face each other, A pair of second sidewalls for positioning the side edges of the electrodes,
The second side wall has a first slit through which the electrode pushed out by the pusher passes, and a second slit provided so as to intersect with the first slit and into which the contact portion enters. Item 1. The electrode stacking device according to item 1.   When the one of the two pushers pushes out one of the positive electrode and the negative electrode toward the laminated portion, the control unit has one of the two pushers with the contact portion entering the second slit. And a timing control unit for controlling the push-out timing of the pusher so that the other of the positive electrode and the negative electrode is pushed toward the laminated portion by the other of the two pushers in that state. The electrode stacking device according to claim 2.   The electrode stacking device according to claim 3, wherein the contact portion is formed of a cushioning material.   When the one of the two pushers pushes out one of the positive electrode and the negative electrode toward the laminated portion, the timing control portion causes the contact portion to enter the second slit so that the tip surface of the contact portion is The electrode stacking device according to claim 4, wherein the push-out timing of the pusher is controlled so that one of the two pushers is stopped in a state of being located inside the inner wall surface of the second side wall.

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