JP2014117677A - Transfer apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transfer apparatus capable of preventing excessive supply of a coating immediately after initiation of transfer of a coating and immediately before completion of the transfer without stopping a coating roll.SOLUTION: A stripping portion 41 of a production apparatus 40 has a movable roll 42, and the movable roll 42 is arranged at a position in the upstream of the position where an active material paste 32 added to the surface of a coating roll 33b is transferred to metal foil 22A and 25A. The movable roll 42 is movable between a contact position where another metal foil 22B and 25B are brought into contact with the active material paste 32 adhered to the surface of the coating roll 33b and a separation position where the metal foil 22B and 25B are separated from the active material paste 32 adhered to the surface of the coating roll 33b. In a transfer apparatus 33, the active material paste 32 adhered to the coating roll 33b is stripped at intervals by moving the movable roll 42 repeatedly between the contact position and the separation position.

Description

  The present invention relates to a transfer device that transfers a paint onto a base sheet by rotating a transport roll in the same direction as a coating roll.

  Power storage devices such as secondary batteries and capacitors are widely used as power sources because they can be recharged and can be used repeatedly. Some secondary batteries include a stacked electrode assembly in which a positive electrode sheet electrode and a negative electrode sheet electrode are stacked with a separator interposed therebetween.

  When forming a sheet-like electrode or a belt-like electrode, an active material layer is generally formed by intermittently applying (transferring) an active material paste (paint) onto a long belt-like metal foil (base sheet). After that, a treatment such as a roll press is performed, and then the electrode is manufactured by cutting the strip-shaped metal foil into a target shape. In the manufacture of the electrode, when the active material paste is intermittently applied to the metal foil, the active material paste tends to be excessively supplied to the metal foil immediately after the start of the application of the active material paste and immediately before the end of the application. As a method for suppressing excessive supply immediately after the start of application of the active material paste and immediately before the end of application, for example, Patent Document 1 can be cited.

  As shown in FIG. 8A, in the intermittent coating method disclosed in Patent Document 1, the paint 86 in the paint reservoir 85 is discharged from the slit with a constant gap by the adjuster 84 disposed on the coating roll 81. As a result, a paint layer 86 a having a constant thickness is formed on the coating roll 81. On the other hand, on the backing roll 82, a base material 83 such as a metal foil is conveyed at a constant speed.

  Then, by bringing the backing roll 82 close to the coating roll 81 and bringing the base material 83 into contact with the paint layer 86a on the coating roll 81, the paint layer 86a is transferred onto the base material 83, and A coating film 89 is formed.

  As shown in FIG. 8B, the non-application part 90 is intermittently formed on the base material 83 by intermittently separating the backing roll 82 from the coating roll 81. In this intermittent coating, the rotation of the coating roll 81 is stopped when the backing roll 82 and the coating roll 81 are separated. The rotation of the coating roll 81 is stopped before the backing roll 82 is detached from the coating roll 81, and the rotation of the coating roll 81 is started after the backing roll 82 approaches the coating roll 81. Thereby, the excessive supply of the paint 86 immediately after the start of application of the paint 86 and immediately before the end of application is suppressed, and the swell at the application start end and application end of the coating film 89 is reduced.

JP-A-9-99269

  However, in the intermittent coating method of Patent Document 1, the coating roll 81 is stopped and the coating roll 81 is stopped in order to suppress excessive supply immediately after the start of application of the paint 86 and immediately before the end of application. In the meantime, the production of electrodes has stopped, and the productivity of electrodes has declined. In addition, while the coating roll 81 is stopped, the paint 86 leaks from the paint reservoir 85, and the thickness of the paint layer 86a increases at the portion where the leaked paint 86 stays. For this reason, the coating film 89 transferred immediately after the rotation of the coating roll 81 is started partially increases in thickness.

  An object of the present invention is to provide a transfer device capable of preventing an excessive supply of paint immediately after the start of transfer of paint and immediately before the end of transfer without stopping the coating roll.

  In order to solve the above-mentioned problems, the transfer device according to claim 1 includes a coating roll, an adhesion device for attaching a paste-like paint to the coating roll, a substrate sheet, and the substrate sheet. A transport roll provided at a position where the paint adhering to the surface of the coating roll can be brought into contact with the coating roll, and by rotating the transport roll in the same direction as the coating roll, In the transfer device for transferring the paint adhered to the surface to the base sheet, the transfer sheet is transported and at a position upstream from the position where the paint attached to the surface of the coating roll is transferred to the base sheet. A contact position for bringing the transfer sheet into contact with the paint adhered to the surface of the coating roll; A movable roll that is movable between a separation position that separates the transfer sheet from the paint adhered to the coating roll, and repeatedly moving the movable roll between the contact position and the separation position, The gist is to strip off the paint adhering to the coating roll at intervals in the circumferential direction of the peripheral surface of the coating roll.

  According to this, when the movable roll moves to the contact position, the paint adhering to the surface of the coating roll is transferred to the transfer sheet conveyed on the movable roll, and is peeled off from the surface of the coating roll. Thereafter, when the movable roll moves from the contact position to the separated position, the paint is not peeled off from the surface of the coating roll and remains attached to the coating roll. Therefore, the coating material adhering to the surface of the coating roll is transferred to the base material sheet that is transported by the transport roll and passes between the transport roll and the coating roll. Therefore, the paint is intermittently applied to the base sheet by intermittently peeling the paint from the surface of the coating roll.

  In the transfer device having the above-described configuration, it is not necessary to repeatedly move the transport roll to the contact position and the separation position with respect to the paint adhering to the surface of the coating roll for intermittent coating. For this reason, the excessive supply of the paint which arises by making the base material sheet in a distant position contact the paint adhering to the surface of the coating roll, and separating the base material sheet from the paint can be eliminated. .

  In addition, in the paint adhered to the surface of the coating roll, the paint is taken away by the transfer sheet at the timing when it is peeled off by the transfer sheet, so that the thickness of the paint becomes thin at the timing of the start of peeling and the timing of completion of the peeling. . Therefore, when the paint adhering to the surface of the coating roll is transferred to the base sheet, it is possible to prevent the paint from being supplied excessively immediately after the start of transfer and immediately before the end of transfer.

In addition to the movable roll, it is preferable to further include at least one roll for conveying the transfer sheet.
According to this, the transfer sheet can be conveyed without slackening.

The transfer sheet may be the same material as the substrate sheet.
According to this, the paint can be transferred to another base sheet conveyed by the movable roll at the same time as the paint is peeled off from the base sheet and intermittently applied by the transfer device. Therefore, it is possible to manufacture a base sheet on which the paint is transferred at another position at the same time that the paint is intermittently applied to the base sheet to prevent the paint from being excessively supplied.

  In addition, a non-application part of the paint is formed between the paint layers adjacent to each other in the conveyance direction of the base sheet, and the length of the paint layer along the conveyance direction and the non-application part Are preferably the same length.

  According to this, by moving the movable roll between the contact position and the separation position, the paint is intermittently transferred to another base sheet as a transfer sheet. The length of the paint transferred to the other base sheet is the same as the length of the non-application portion. Therefore, the same product can be manufactured with the base sheet transported by the transport roll and another base sheet.

Moreover, you may provide the scraper which scrapes off the said coating material transcribe | transferred by the said transfer sheet from the said transfer sheet.
According to this, the paint stripped off from the coating roll can be reused. In addition, it is preferable that the coating apparatus includes a supply unit that supplies the coating material, the supply unit has an opening for supplying the coating material, and the scraper is disposed above the supply port. .

  According to this, when the paint is scraped off from the transfer sheet by the scraper, the paint falls. Since the supply port is open at the destination, the paint can be returned as it is from the supply port to the supply unit.

The base sheet and the transfer sheet are metal foils, and the paint is an active material paste containing an active material.
According to this, the active material paste can be intermittently applied to the metal foil by the transfer device, and the electrode sheet of the power storage device can be manufactured.

  According to the present invention, it is possible to prevent an excessive supply of paint immediately after the start of transfer of paint and immediately before the end of transfer without stopping the coating roll.

The disassembled perspective view which shows the secondary battery of embodiment. The perspective view which shows the external appearance of a secondary battery. The perspective view which shows the component of an electrode assembly. The figure which shows the manufacturing apparatus of embodiment typically. (A) is a figure which shows the movable roll in a separation position, (b) is a figure which shows the movable roll in a contact position, (c) is a figure which shows the movable roll which returned to the separation position. The top view which shows the layer and non-application | coating part of the active material paste of metal foil. The figure which shows the manufacturing apparatus of another example typically. (A) And (b) is a figure which shows background art.

Hereinafter, an embodiment embodying the present invention will be described with reference to FIGS.
As shown in FIGS. 1 and 2, in a secondary battery 10 as a power storage device, an electrode assembly 14 is accommodated in a case 11. The case 11 has a rectangular parallelepiped main body member 12 and a rectangular flat plate-like lid member 13. The main body member 12 has a housing portion S inside thereof, and an insertion port 13c communicating with the housing portion S is opened. The lid member 13 closes the insertion port 13c. Both the main body member 12 and the lid member 13 constituting the case 11 are made of metal (for example, stainless steel or aluminum). Further, the secondary battery 10 of the present embodiment is a prismatic battery whose appearance is square. Further, the secondary battery 10 of the present embodiment is a lithium ion battery.

  A positive electrode terminal 28 and a negative electrode terminal 29 for taking out electricity from the electrode assembly 14 are electrically connected to the electrode assembly 14. The positive electrode terminal 28 and the negative electrode terminal 29 protrude out of the case 11 through the through hole 13 a of the lid member 13, and the positive electrode terminal 28 and the negative electrode terminal 29 have ring-shaped insulation for insulation from the case 11. Each ring 13b is attached.

  As shown in FIG. 3, the electrode assembly 14 includes a separator 27 in which a plurality of positive electrodes 21 and a plurality of negative electrodes 24 are formed of a porous film through which ions (lithium ions) related to electrical conduction can pass. It is constituted by being alternately laminated via

  The positive electrode 21 includes a rectangular positive metal foil (in the present embodiment, an aluminum foil) 22 and a rectangular positive electrode active material layer 23 provided on both surfaces (surfaces) of the positive metal foil 22. And having. The positive electrode active material layer 23 has the same planar shape on both surfaces of the metal foil 22 and faces each other with the metal foil 22 interposed therebetween. The positive electrode 21 has an uncoated portion 22d along which the positive electrode active material layer 23 is not provided. And in the positive electrode 21, the positive electrode current collection tab 22c is provided in the state which protrudes in a part of one side of the uncoated part 22d.

  The negative electrode 24 includes a rectangular negative electrode metal foil (copper foil in this embodiment) 25 and a rectangular negative electrode active material layer 26 provided on both surfaces (surfaces) of the negative electrode metal foil 25. And having. The active material layers 26 on both surfaces of the negative electrode metal foil 25 have the same planar shape. The negative electrode 24 has an uncoated portion 25d along which the negative electrode active material layer 26 is not provided. And in the negative electrode 24, the negative electrode current collection tab 25c is provided in the state which protrudes in a part of one side of the uncoated part 25d.

  As shown in FIG. 1, the positive electrode 21 and the negative electrode 24 are arranged such that the positive electrode current collecting tabs 22c are arranged in a line along the stacking direction, and the negative electrode current collecting tabs 25c are not overlapped with the positive electrode current collecting tabs 22c. Are stacked in a row along the stacking direction. Each of the positive electrode current collecting tabs 22c is bent in a state of being collected (bundled) within a range from one end to the other end in the stacking direction of the electrode assembly 14. Each positive current collecting tab 22c is electrically connected by welding a portion where each positive current collecting tab 22c overlaps, and a positive terminal 28 is connected to the positive current collecting tab 22c. Further, each negative electrode current collecting tab 25c is electrically connected by welding a portion where each negative electrode current collecting tab 25c overlaps, and the negative electrode terminal 29 is connected to the negative electrode current collecting tab 25c.

Next, a method for manufacturing the positive electrode 21 and the negative electrode 24 will be described.
First, the manufacturing apparatus 40 for the positive electrode 21 and the negative electrode 24 will be described. As shown in FIG. 4, when manufacturing the positive electrode 21, the manufacturing apparatus 40 provides the active material layer 23 on the first surface M <b> 1 as one surface of the metal foil 22 where the positive electrode active material layer 23 is not provided. In the case of manufacturing the negative electrode 24, the active material layer 26 is provided on the first surface M1 of the metal foil 25A where the negative active material layer 26 is not provided.

  The manufacturing apparatus 40 includes a supply mechanism 31 for setting and supplying the strip-shaped metal foils 22 and 25 wound around the supply roll 31a. In the following description, the metal foils 22 and 25 delivered from the supply roll 31a are referred to as metal foils 22A and 25A, and the metal foils 22 and 25 conveyed by the stripping unit 41 described later are separated from the other metal foils 22B and 25A. It is described as 25B.

  A transfer device 33 is provided above the supply mechanism 31 to transfer the active material paste 32 to the first surface M1 of the supplied metal foils 22A and 25A. Therefore, the transfer device 33 is a device that transfers the active material paste 32 as the paint to the metal foils 22A and 25A as the base sheet.

  Here, as the active material paste 32 applied to the positive electrode metal foil 22A, a material obtained by kneading a positive electrode active material, a conductive agent, a binder, and a solvent is used. Further, as the active material paste 32 applied to the negative electrode metal foil 25B, a material obtained by kneading a negative electrode active material, a conductive agent, a binder, and a solvent is used.

  The transfer device 33 stores the active material paste 32 and attaches the active material paste 32 supplied from the tank 36, the coating roll 33b, and the tank 36 as a supply unit for supplying the active material paste 32 to the surface of the coating roll 33b. An attachment device 33c for adjusting the thickness (amount) of the material paste 32 is provided. The tank 36 includes a storage portion 36 a for the active material paste 32, and the storage portion 36 a has an opening for supplying a supply port 36 b for the active material paste 32. The coating roll 33b rotates in the direction indicated by Y2.

  Further, the transfer device 33 includes a transport roll 33d. The transport roll 33d is provided at a position where the metal foils 22A and 25A can pass between the transport roll 33b and the active material paste 32 attached to the surface of the coating roll 33b is brought into contact with the metal foils 22A and 25A. It is provided at a position where it is possible. And the conveyance roll 33d rotates in the conveyance direction Y1 of metal foil 22A, 25A, and conveys metal foil 22A, 25A. The transport roll 33d is always disposed at a position spaced apart from the coating roll 33b.

  The transfer device 33 includes a stripping unit 41 that strips the active material paste 32 attached to the surface of the coating roll 33b from the coating roll 33b. The stripping unit 41 includes a movable roll 42 that can move in the direction of moving toward and away from the coating roll 33b, a support roll 43 on which metal foils 22B and 25B serving as transfer sheets conveyed by the movable roll 42 are stretched, and a metal A tension roll 44 that adjusts the tension of the foils 22 and 25. In addition, another metal foil 22B, 25B conveyed by the peeling part 41 is the same material as metal foil 22A, 25A conveyed by the conveyance roll 33d.

  The movable roll 42 rotates in the same direction Y3 as the coating roll 33b. Moreover, the movable roll 42 is arrange | positioned in the position upstream from the position where the active material paste 32 adhering to the surface of the coating roll 33b is transcribe | transferred to metal foil 22A, 25A. The movable roll 42 can be positioned at a contact position where the active material paste 32 is transferred to the first surface N1 of another metal foil 22B, 25B. Moreover, the movable roll 42 is a position away from the contact position, and can be positioned at a separation position where the active material paste 32 is not transferred to the first surface N1 of the other metal foils 22B and 25B. Therefore, the movable roll 42 can move between the contact position and the separation position.

  The tension roll 44 interlocks with the movement of the movable roll 42 and enables the movable roll 42 to move, while preventing the slack of the other metal foils 22B and 25B accompanying the movement. As shown in FIG. 5A, the tension roll 44 prevents the slack of the other metal foils 22B and 25B at the first position when the movable roll 42 is in the separated position. As shown in FIG. 5 (b), the tension roll 44 moves from the first position to the second position in order to allow the movable roll 42 to move to the contact position and to prevent the other metal foils 22B and 25B from loosening. To do.

  As shown in FIG. 4, a control device 39 is signal-connected to the movable roll 42 and the tension roll 44, and the positions of the movable roll 42 and the tension roll 44 are controlled by the control device 39. A control program for the stripping unit 41 is stored in a storage unit (not shown) of the control device 39. In the control program of the stripping unit 41, the length of time for stripping the active material paste 32 from the coating roll 33b, that is, the length of time for transferring the active material paste 32 from the coating roll 33b to another metal foil 22B, 25B. Is set.

  In the control program, the timing for moving the movable roll 42 from the separated position to the contact position and the timing for moving the tension roll 44 from the first position to the second position are set. Further, in the control program, a timing for moving the movable roll 42 away from the contact position and a timing for moving the tension roll 44 from the second position to the first position are set. Then, the layer of the active material paste 32 transferred to the other metal foils 22B and 25B according to the length of time for which the movable roll 42 is positioned at the contact position (the length of time for which the tension roll 44 is positioned at the second position). And the lengths of the non-coating portions 22a and 25a along the length direction of the metal foils 22A and 25A conveyed by the conveyance roll 33d are determined.

  Further, depending on the length of time during which the movable roll 42 is separated from the contact position (the length of time during which the tension roll 44 is positioned at the first position), the length of the other metal foils 22B, 25B along the length direction is not increased. The lengths of the application parts 22a and 25a are determined. Furthermore, the length of the layer of the active material paste 32 along the length direction of the metal foils 22A and 25A conveyed by the conveyance roll 33d is determined by the length of time that the movable roll 42 is separated from the contact position. The

  As shown in FIG. 6, in this embodiment, the length of the layer of the active material paste 32 along the length direction of the metal foils 22A and 25A is the same as the length of the non-application portions 22a and 25a (one to one). The length at the contact position and the separation position of the movable roll 42 and the tension roll 44 is set so as to be. Then, the control device 39 repeatedly moves the movable roll 42 between the separation position and the contact position, and repeatedly moves the tension roll 44 between the first position and the second position, whereby the metal foil 22A, The active material paste 32 is intermittently applied to 25A, and the active material paste 32 is also intermittently applied to the other metal foils 22B and 25B.

  As shown in FIG. 4, in the manufacturing apparatus 40, a drying furnace 34 for drying the active material paste 32 transferred to the first surface M1 of the metal foils 22A and 25A is provided on the side of the transfer apparatus 33. . Inside the drying furnace 34, a high-temperature heat medium (for example, gas such as air or nitrogen gas) is supplied from the outside to heat the active material paste 32 transferred to the metal foils 22A and 25A, and at the same time, the active material paste 32. The solvent vapor evaporated from the inside is removed from the drying furnace 34.

  On the side of the outlet side of the drying furnace 34, there is a press mechanism unit 38 that compresses the dried active material paste 32 while heating it with a pair of press rollers 38a while transporting the metal foils 22A and 25A in the transport direction Y1. Is provided. The manufacturing apparatus 40 includes a take-up roll 38b that winds the metal foils 22A and 25A behind the press roller 38a in the transport direction Y1 of the metal foils 22A and 25A.

  The manufacturing apparatus 40 includes a dancer roll 49 behind the supply roll 31a and in front of the winding roll 38b in the transport direction Y1 of the metal foils 22A and 25A. The dancer roll 49 adjusts the tension of the metal foils 22A and 25A being conveyed to prevent the metal foils 22A and 25A from slackening.

Next, the manufacturing method of the positive electrode 21 and the negative electrode 24 is demonstrated with the effect | action.
As shown in FIG. 5A, the active material paste 32 adjusted to a predetermined thickness by the attachment device 33c is applied to the surface of the coating roll 33b while the coating roll 33b and the transport roll 33d are rotating in the same direction. Adhere to. At this time, the movable roll 42 is located at the separation position.

  As shown in FIG. 5B, the control device 39 controls the movable roll 42 to move it from the separated position to the contact position, and to move the tension roll 44 from the first position to the second position. Then, the active material paste 32 attached to the surface of the coating roll 33b is transferred to the first surface N1 of the other metal foils 22B and 25B, and the active material paste 32 is spaced apart in the circumferential direction of the peripheral surface of the coating roll 33b. Is stripped off. For this reason, the active material paste 32 supplied from the tank 36 continues to be transferred to the first surface N1 of the other metal foils 22B and 25B being conveyed, and the layer of the active material paste 32 is formed on the other metal foils 22B and 25B. Will be formed.

  When a predetermined time elapses after the movable roll 42 is located at the contact position, the control device 39 controls the movable roll 42 to separate the movable roll 42 from the contact position as shown in FIG. And the tension roll 44 is controlled to move from the second position to the first position.

  As shown in FIG. 5 (b), in the active material paste 32 on the side remaining on the coating roll 33b, the end portion first transferred to the metal foils 22A and 25A is the start end portion 32a, and the end portion transferred last is the end portion. It is set as the termination | terminus part 32b. The terminal portion 32 b of the active material paste 32 is formed at a timing when another metal foil 22 </ b> B, 25 </ b> B comes into contact with the active material paste 32. At a moment when another metal foil 22B, 25B comes into contact with the active material paste 32 and shortly thereafter, the active material paste 32 is taken away by another metal foil 22B, 25B. Further, the other metal foils 22B and 25B peel off the active material paste 32 from the surface of the coating roll 33b while being in sliding contact with the circumferential surface of the movable roll 42. Therefore, the thickness of the terminal portion 32b of the active material paste 32 remaining on the surface of the coating roll 33b is reduced.

  Further, the start end portion 32 a of the active material paste 32 remaining on the surface of the coating roll 33 b is formed at a timing when the separate metal foils 22 </ b> B and 25 </ b> B are separated from the active material paste 32. At a moment before the other metal foils 22B and 25B are separated from the active material paste 32 and shortly before that, the active material paste 32 is taken away by the other metal foils 22B and 25B. Further, the other metal foils 22B and 25B peel off the active material paste 32 from the surface of the coating roll 33b while being in sliding contact with the circumferential surface of the movable roll 42. Therefore, the thickness of the start end portion 32a of the active material paste 32 remaining on the surface of the coating roll 33b is reduced. Further, in the active material paste 32 remaining on the surface of the coating roll 33b, the layer of the active material paste 32 becomes a constant thickness by adjustment by the attachment device 33c except for the start end portion 32a and the end end portion 32b.

  And while the active material paste 32 is peeled off from the surface of the coating roll 33b, the active material paste 32 is not sent between the coating roll 33b and the conveyance roll 33d. Therefore, while the active material paste 32 is peeled off from the surface of the coating roll 33b, the active material paste 32 is not transferred to the metal foils 22A and 25A conveyed by the conveyance roll 33d, and the non-application portions 22a and 25a are not transferred. Is formed.

  When the movable roll 42 is separated from the active material paste 32, the active material paste 32 adhering to the surface of the coating roll 33b is not peeled off by the other metal foils 22B and 25B, and between the coating roll 33b and the transport roll 33d. Sent. As a result, the active material paste 32 sent by the coating roll 33b is transferred to the metal foils 22A and 25A conveyed by the conveyance roll 33d.

  At this time, the active material paste 32 remaining on the surface of the coating roll 33b has a reduced thickness at the start end portion 32a and the end portion 32b. For this reason, in the active material paste 32 transferred to the metal foils 22A and 25A, the thickness of the transfer start position and the transfer end position is thinner than other portions.

  As shown in FIG. 6, the layers of the active material paste 32 formed on the metal foils 22A and 25A conveyed by the conveyance roll 33d and the lengths of the non-application portions 22a and 25a are the same. Further, the length of the active material paste 32 formed on the other metal foils 22B and 25B conveyed by the movable roll 42 and the lengths of the non-application portions 22a and 25a are also the same.

  Next, as shown in FIG. 4, the metal foils 22 </ b> A and 25 </ b> A coated with the active material paste 32 are conveyed to a drying furnace 34, and the active material paste 32 is dried by the drying furnace 34. Next, the pressing mechanism unit 38 performs a pressing step of compressing the dried active material paste 32 while heating. The active material paste 32 is compressed by this pressing process. Next, the metal foils 22A and 25A are wound into a roll shape by the winding roll 38b. Thereafter, the active material layers 32 and 26 are formed through various processes such as baking the active material paste 32.

  Next, similarly to the above, the active material layers 23 and 26 are formed on the second surface M2 opposite to the first surface M1 where the active material layers 23 and 26 have already been formed in the metal foils 22A and 25A. Then, the metal foils 22A and 25A on which the active material layers 23 and 26 are formed on both surfaces are formed into the shape of the positive electrode 21 and the negative electrode 24 including the positive electrode current collecting tab 22c and the negative electrode current collecting tab 25c. 21 and the negative electrode 24 are completed. In addition, uncoated parts 22d and 25d, positive electrode current collecting tab 22c, and negative electrode current collecting tab 25c are formed from uncoated parts 22a and 25a of metal foils 22A and 25A.

  Thereafter, the completed positive electrode 21 and negative electrode 24 are laminated with a separator 27 interposed therebetween, whereby the electrode assembly 14 is formed. Subsequently, the electrode assembly 14 is accommodated in the case 11, and the positive electrode current collecting tab 22 c and the negative electrode current collecting tab 25 c are electrically connected to the positive electrode terminal 28 and the negative electrode terminal 29, respectively. Then, the secondary battery 10 is completed by filling the case 11 with the electrolytic solution.

  In addition, also in the other metal foils 22B and 25B conveyed by the stripping unit 41, after the active material paste 32 is dried and the active material layers 23 and 26 are formed by performing a pressing process or the like, Active material layers 23 and 26 are also formed on the second surface M2. Then, the metal foils 22B and 25B on which the active material layers 23 and 26 are formed on both surfaces are formed into the shape of the positive electrode 21 and the negative electrode 24 including the positive current collecting tab 22c and the negative current collecting tab 25c, and the positive electrode 21 and the negative electrode 24 are completed.

According to the above embodiment, the following effects can be obtained.
(1) The peeling unit 41 is provided in the transfer device 33 of the manufacturing apparatus 40. And the movable roll 42 of the peeling part 41 is intermittently contacted / separated with respect to the coating roll 33b, and the active material paste 32 adhering to the surface of the coating roll 33b is intermittently peeled to another metal foil 22B, 25B. Thus, the active material paste 32 can be intermittently applied to the metal foils 22A and 25A conveyed by the conveyance roll 33d. Therefore, the active material paste 32 can be intermittently applied to the metal foils 22A and 25A without bringing the transport roll 33d into and out of contact with the coating roll 33b. Therefore, it is possible to eliminate the excessive supply of the active material paste 32 at the start end portion 32a and the end portion 32b caused by bringing the metal foils 22A and 25A into contact with and separating from the active material paste 32 attached to the surface of the coating roll 33b. it can.

  Therefore, it is possible to eliminate the excessive supply of the active material paste 32 at the start end portion 32a and the end end portion 32b without stopping the coating roll 33b, and it is possible to eliminate the decrease in productivity of the positive electrode 21 and the negative electrode 24. . In addition, since the coating roll 33b is not stopped, the active material paste 32 stays at the time of the stop, so that the layer of the active material paste 32 can be prevented from being partially thickened.

  (2) In the stripping part 41, the other metal foils 22B and 25B are circulated, and the other metal foils 22B and 25B are intermittently brought into contact with the active material paste 32 attached to the surface of the coating roll 33b. I made it. Therefore, the active material paste 32 can be intermittently transferred to the other metal foils 22B and 25B in the stripping portion 41. Therefore, the active material paste 32 can be intermittently applied to the other metal foils 22B and 25B at the same time as the active material paste 32 is intermittently applied to the metal foils 22 and 25 conveyed by the conveyance roll 33d. . Therefore, the production amount of the positive electrode 21 and the negative electrode 24 can be increased as compared with the case where the active material paste 32 is intermittently applied to the metal foils 22 and 25 transported by the transport roll 33d.

  (3) The time for positioning the movable roll 42 at the contact position is the same as the time for positioning the movable roll 42 at the separation position. And in metal foil 22A, 25A conveyed by the conveyance roll 33d, the length of the layer of the active material paste 32 in the length direction and the length of the non-coating part 22a, 25a were made the same. Therefore, the length of the layer of the active material paste 32 peeled off by the stripping unit 41 is the same as the length of the layer of the active material paste 32 remaining on the coating roll 33b. Therefore, the length of the layer of the active material paste 32 and the length of the non-application parts 22a and 25a are the same in the metal foils 22A and 25A conveyed by the conveyance roll 33d and the other metal foils 22B and 25B. can do. Therefore, the same positive electrode 21 and negative electrode 24 can be manufactured from the metal foils 22A and 25A and the different metal foils 22B and 25B.

  (4) In the obtained active material layers 23 and 26 of the positive electrode and the negative electrode, it is possible to prevent the start end portion 32a and the end portion 32b from becoming thick. As a result, in the electrode assembly 14 formed by laminating the positive electrode 21 and the negative electrode 24, variation in the distance between the active material layers 23 and 26 facing each other can be suppressed.

  (5) The stripping unit 41 includes a support roll 43 and a tension roll 44 in addition to the movable roll 42. For this reason, the tension | tensile_strength of metal foil 22B, 25B can be adjusted with the support roll 43 and the tension roll 44, and it can prevent that metal foil 22B, 25B conveyed is loosened.

In addition, you may change this embodiment as follows.
As shown in FIG. 7, a resin sheet 51 may be used as a transfer sheet in the peeling unit 50. The resin sheet 51 has one end connected to the supply roll 52 and the other end connected to the take-up roll 53, so that the resin sheet 51 fed from the supply roll 52 is taken up by the take-up roll 53. It has become. Therefore, the resin sheet 51 does not circulate through the stripping part 50.

  The winding roll 53 is disposed above the tank 36. A scraper 55 is disposed below the resin sheet 51 and above the tank 36. The scraper 55 scrapes off the active material paste 32 attached to the resin sheet 51 from the resin sheet 51.

  And in the peeling part 50, the active material paste 32 adhering to the surface of the coating roll 33b is transcribe | transferred to the resin sheet 51 by positioning the movable roll 42 in a contact position, and is stripped off from the coating roll 33b. The active material paste 32 attached to the resin sheet 51 is transferred toward the take-up roll 53 as the resin sheet 51 is taken up by the take-up roll 53. Then, the active material paste 32 is scraped off by the scraper 55 above the tank 36. Then, the active material paste 32 falls and is returned as it is into the tank 36 from the supply port 36b opened to the dropping destination.

  Therefore, the active material paste 32 can be reused by scraping the active material paste 32 peeled off from the surface of the coating roll 33 b with the scraper 55 and returning it to the tank 36. Further, it is possible to save the trouble of returning the stripped active material paste 32 to the tank 36 by another means.

  In the form shown in FIG. 7, the winding roll 53 and the scraper 55 may be arranged not at the top of the supply port 36 b in the tank 36 but at a position away from the tank 36, and active at a position away from the tank 36. The material paste 32 may be scraped off.

  In the form shown in FIG. 7, using another metal foil 22B, 25B as a transfer sheet, the active material paste 32 is peeled off from the surface of the coating roll 33b, and at the same time, the active material paste 32 is applied to another metal foil 22B, 25B. May be transferred to produce the positive electrode 21 and the negative electrode 24.

In the embodiment, the length of time that the movable roll 42 is located at the contact position and the length of time that the movable roll 42 is located at the separated position may be appropriately changed.
The active material paste 32 may be transferred only to the first surface M1 of the metal foils 22A and 25A, and the positive and negative electrode active material layers 23 and 26 may be formed only on the first surface M1.

As long as the active material paste 32 can be attached to the coating roll 33b with a predetermined thickness, the attaching device 33c may be omitted.
The supply part of the active material paste 32 may be a syringe or the like instead of the tank 36.

The transfer device 33 is not used to transfer the active material paste 32 to the metal foils 22 and 25, but may be used to transfer other paints to the base sheet.
The present invention may be embodied as a power storage device such as a nickel hydride secondary battery or an electric double layer capacitor, an electrode for the power storage device, and a method for manufacturing the electrode.

  22, 22A, 25, 25A ... metal foil as a base sheet, 22a, 25a ... non-application part, 22B, 25B ... another metal foil as a transfer sheet, 32 ... active material paste as paint, 33 ... transfer device , 33b ... coating roll, 33c ... adhesion device, 33d ... transport roll, 36 ... tank as supply unit, 36b ... supply port, 42 ... movable roll, 55 ... scraper.

Claims (7)

A coating roll;
An attachment device for attaching a paste-like paint to the coating roll;
A transport roll provided at a position where the base sheet is transported, and the base sheet can be brought into contact with the paint adhered to the surface of the coating roll;
In the transfer device that transfers the paint adhered to the surface of the coating roll to the base sheet by rotating the transport roll in the same direction as the coating roll,
The transfer sheet is conveyed, and the transfer sheet is brought into contact with the paint adhered to the surface of the coating roll at a position upstream from the position where the paint adhered to the surface of the coating roll is transferred to the base sheet. A movable roll that is movable between a contact position and a separation position that separates the transfer sheet from the paint adhered to the coating roll;
By repeatedly moving the movable roll between the contact position and the separation position, the paint adhered to the coating roll is peeled off with a gap in the circumferential direction of the peripheral surface of the coating roll. Transfer device.   The transfer device according to claim 1, further comprising at least one roll for conveying the transfer sheet, in addition to the movable roll.   The transfer device according to claim 1, wherein the transfer sheet is made of the same material as the base sheet.   A non-application part of the paint is formed between paint layers adjacent to each other in the conveyance direction of the base sheet, and the length of the paint layer along the conveyance direction and the length of the non-application part The transfer device according to claim 1, wherein the transfer devices are the same in length.   The transfer device according to claim 1, further comprising a scraper that scrapes off the paint transferred to the transfer sheet from the transfer sheet.   6. The supply device according to claim 5, further comprising a supply unit that supplies the coating material to the adhesion device, the supply unit having an opening for supplying the coating material, and the scraper disposed above the supply port. Transfer device.   The transfer device according to any one of claims 1 to 6, wherein the base sheet is a metal foil, and the paint is an active material paste containing an active material.