JP2012009281A - Battery production method and device production method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery production method and production apparatus that can execute a foil-joining work suppressing reduction of a production quantity to the maximum.SOLUTION: Supply of collector sheets 50 to a coating step in a foil-joining work for joining collector sheets 50 is performed in a supply process including: a pressure-reduction releasing step (S101) for changing the pressure-reduced state in the coating step to a normal pressure state; a tension reducing step (steps S102, S103) for reducing a tension applied to a collector sheet 50 in the coating step to a tension applied in a reversing step after the pressure-reduction releasing step (S101) is completed; and a foil joint step (step S104) for joining the front end portion of a newly supplied second collector sheet 50 to the rear end portion of a current collector sheet 50 after the tension reducing step (steps S102, S103) is completed, and feeding the joined collector sheets 50 to the coating step.

Description

  The present invention relates to a method for manufacturing a battery having an electrode foil in which a paste material is coated on a flat surface of a belt-shaped current collector sheet, and a technology of a manufacturing apparatus, and more specifically, when the current collector sheet is added. The present invention relates to a foil splicing technique.

Conventionally, as an electrode of a battery, an electrode foil formed by forming an active material layer made of a paste material on the front and back surfaces of a current collector sheet of metal foil is used, and the electrode foil is mainly manufactured by a coating apparatus. (For example, refer to “Patent Document 1”.)
The coating device includes a feeding device, a discharge device, a drying furnace, a winding device, and the like.
And in order to manufacture electrode foil with the coating apparatus which consists of such a structure, first, the collector sheet which is metal foil wound up by roll shape is drawn out with a feeding apparatus, The surface of this collector sheet The paste material is discharged and applied by a discharge device. Thereafter, the applied paste material is dried by a drying furnace, and then the paste material is discharged and applied to the back surface of the current collector sheet by a discharge device. And after drying the apply | coated paste material again with a drying furnace, it winds up in roll shape with a winding device.

Here, for example, an electrode foil used for a lithium ion secondary battery has an extremely thin active material layer, and in order to form such an active material layer efficiently and reliably, a paste on a current collector sheet The material is applied under reduced pressure (see, for example, “Patent Document 2”).
That is, the discharge device includes a die for discharging a paste material, a backup roll disposed to face the die, a current collector sheet between the die and the backup roll, and a paste material application portion. And a decompression chamber covering the upstream side in the transport direction.
Then, while the current collector sheet is wound around the backup roll, the current collector sheet is conveyed between the backup roll and the die, and the paste material discharged from the die is applied in the decompression chamber whose pressure is reduced in the room. It is.

Moreover, in the said coating apparatus, since the paste material is applied to the front and back of a collector sheet, it is necessary to reverse the collector sheet in the middle of conveyance. Accordingly, a reversing device is often provided in order to smoothly perform the reversing operation of the current collector sheet (see, for example, “Patent Document 3”).
The reversing device includes, for example, a plurality of air turn rollers disposed along the axial direction along each side of a polygon such as a triangle in plan view, and a conveying surface (current collector) of each air turn roller. An infinite number of fine holes are perforated on the outer peripheral surface around which the body sheet is wound, and compressed air is ejected from the fine holes.
The current collector sheet is wound around each air turn roller in a state of being floated from the transport surface by the compressed air, and is smoothly transported while sliding sideways in the axial direction of the air turn roller. And finally, it is carried out from the reversing device in a state where the front surface and the back surface are reversed.

In the coating apparatus having the above-described configuration, in order to prevent the current collector sheet from floating from the backup roll due to the reduced pressure in the reduced pressure chamber, a high load is applied to the current collector sheet in the vicinity of the discharge device. It is necessary to add tension.
On the other hand, in the vicinity of the reversing device, the current collector sheet is wound around each air turn roller, and the current collector sheet has a low load so as to be smoothly conveyed while sliding sideways in the axial direction of the air turn roller. It is necessary to add tension.
For this reason, a nip roller device is disposed between the discharge device and the reversing device (more specifically, near the downstream side of the drying furnace), and the two nip rollers provided in the nip roller device are used. By sandwiching the current collector sheet being conveyed, the tension applied to the current collector sheet on the discharge device side and the reversing device side is divided.

By the way, when replacing the remaining current collector sheet with a new current collector sheet, the ends of these current collector sheets are joined to each other with an adhesive tape to connect them (foil joint). "Foil splicing work" is performed.
Moreover, when performing the said foil splicing operation | work, in order to maintain the production amount of the electrode foil which satisfies predetermined quality as much as possible, a coating device is continuously operated without stopping.

JP 2000-353514 A Japanese Patent Laid-Open No. 10-188962 JP 2005-298129 A

Here, in the current collector sheet transported through the coating apparatus, the location where the foil splicing was performed (hereinafter referred to as “foil splicing location”) is a portion of the adhesive tape that was applied. Only the thickness is increasing. And the thickness of the foil joint location of a collector sheet has a larger value than the gap between the die and the backup roll.
Therefore, when the foil joint portion of the current collector sheet passes through the part of the discharge device, first, the discharge of the paste material by the die is stopped, and further, after the die is moved in the separation direction with respect to the backup roller, It is necessary to configure such that the foil joint portion passes through the portion of the discharge device.

In addition, the nip roller device is disposed near the downstream side of the drying furnace, and is thicker than other parts, and the foil joining point of the current collector sheet to which the adhesive tape having adhesive force is attached Reaches the nip roller device part while being heated by the drying furnace, but when the foil spliced part is heated and sandwiched by two nip rollers, a large number of wrinkles are formed on the current collector sheet. appear.
Therefore, when the foil joining location of the current collector sheet passes between the two nip rollers, it is necessary to pass the foil joining location with the two nip rollers separated and opened.

On the other hand, if the two nip rollers are opened, the tension applied to the current collector sheet on the discharge device side and the reversing device side is connected.
As a result, the tension applied to the current collector sheet is unified with the high-load tension on the discharge device side, and rubbing occurs between the current collector sheet and each air turn roller in the reversing device.
Therefore, it is necessary to open the two nip rollers after the tension on the discharge device side is reduced to the tension on the reversing device side.

However, as described above, when the tension on the discharge device side is reduced to the tension on the reversing device side, the current collector sheet conveyed near the discharge device is lifted from the backup roll because the decompression chamber is decompressed. Become.
In addition, the paste material discharged under reduced pressure spreads in the width direction (in the direction perpendicular to the conveying direction of the current collector sheet in a plan view) as compared with the case of discharging under normal pressure. When the tension on the discharge device side is reduced to the tension on the reversing device side while the pressure is reduced, an electrode foil with a narrow coating width (dimension in the width direction of the active material layer) is produced. There is a risk of becoming a defective product.

From the above, when carrying out the foil splicing operation in the conventional coating apparatus, first, the discharge of the paste material in the discharge device is stopped, the pressure in the decompression chamber is returned to normal pressure, and then the die is removed. While moving in the separation direction with respect to the backup roller, the tension on the discharge device side was reduced to the tension on the reversing device side, and the two nip rollers were opened. And after the foil splicing operation of the current collector sheet is completed and the foil splicing location of the current collector sheet passes through the nip roller device, the discharge device and the nip roller device are in the original state (the foil splicing operation is performed) It was supposed to return to the state before.
As described above, in the conventional coating apparatus, when performing the foil splicing operation, the paste material can be applied to the current collector sheet until the foil spliced portion that has been foil spliced passes through the nip roller device. However, the yield of the electrode foils to be produced and the production volume were reduced.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a battery manufacturing method and a manufacturing apparatus capable of performing a foil splicing operation that prevents a decrease in production as much as possible. .

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

  That is, according to the first aspect of the present invention, a coating process for applying the paste material while applying a high load tension to the strip-shaped current collector sheet under reduced pressure, and after the coating process is completed, the coating process is performed. The front and back surfaces of the current collector sheet are reversed while sliding the current collector sheet on the outer peripheral surface of the air turn roller while applying a low load tension to the current collector sheet as compared with the tension applied in the construction process. A battery manufacturing method for manufacturing an electrode foil by a manufacturing process comprising a reversing process, and to the coating process of the current collector sheet during a foil splicing operation for joining the current collector sheets Supply of the reduced pressure state in the coating step to normal pressure state, and after the completion of the reduced pressure release step, the tension applied to the current collector sheet in the coating step, the reversal step Reduce to tension at After completion of the force reduction step and the tension reduction step, the front end portion of the second current collector sheet to be newly supplied is connected to the rear end portion of the first current collector sheet, and the connected current collector is connected. And a foil joining step for conveying the electric sheet to the coating step.

  In Claim 2, it is the manufacturing method of the battery of Claim 1, Comprising: In the said decompression release process, the gap | interval dimension of the said die | dye and the said collector sheet is predetermined for every decompression value, The gap size is changed in accordance with the change in the reduced pressure value.

  In claim 3, a backup roll around which a belt-like current collector sheet conveyed in a state where a high load tension is applied is wound on the backup roll with the current collector sheet sandwiched therebetween. A coating portion having a die provided oppositely and arranged to be movable in the proximity and separation direction with respect to the backup roll; and a decompression means for decompressing a gap between the backup roll and the die, the coating The current collector sheet is provided on the downstream side in the current collector sheet conveying direction, and the current collector sheet of the current collector sheet is slid on the outer peripheral surface while sliding the current collector sheet to which a low load tension is applied as compared with the coated portion. An electrode by a coating apparatus comprising a reversing unit having an air turn roller for reversing the front and back surfaces, and a foil splicing unit that is provided upstream of the coating unit and joins and connects the two current collector sheets. A battery manufacturing apparatus for supplying the current collector sheet to the coating section during a seam joining operation for joining the current collector sheets. The pressure reduction state of the gap between the die and the die is changed to a normal pressure state, and after the gap between the backup roll and the die reaches a normal pressure, the tension applied to the current collector sheet at the coating portion is reduced. After the tension becomes equal to the tension applied to the current collector sheet at the reversing portion, the foil joint portion newly supplies the first current collector sheet to the rear end portion of the first current collector sheet. It is performed by joining the front end portions of the second current collector sheets together and transporting the connected current collector sheets to the coating portion.

  In Claim 4, It is a battery manufacturing apparatus of Claim 3, Comprising: In the said coating part, the gap | interval dimension of the said die | dye and the said collector sheet is predetermined for every pressure reduction value of a pressure reduction means. When the pressure reducing means of the coating unit is gradually released, the die is moved in the proximity / separation direction with respect to the backup roll as the pressure reduction value changes.

As effects of the present invention, the following effects can be obtained.
That is, according to the battery manufacturing method and the battery manufacturing apparatus of the present invention, it is possible to perform a foil splicing operation that prevents a decrease in the production amount as much as possible.

BRIEF DESCRIPTION OF THE DRAWINGS The structure schematic which showed the whole structure of the coating apparatus which concerns on one Example of this invention. The figure which showed an example of the decompression map. It is the figure which showed operation | movement of the coating apparatus at the time of foil joining operation | work, and is the flowchart which showed operation | movement from the adjustment start of the die gap based on a decompression map to passing through the joint part of foil, and restoring the position of die | dye. Similarly, it is the figure which showed the operation | movement of the coating apparatus at the time of foil joining operation | work, and the flowchart which showed the operation | movement from returning the application of the paste material to foil to returning a die gap to the original state based on a decompression map.

  Next, embodiments of the invention will be described.

[Coating device 1]
First, an overall configuration of a coating apparatus 1 that embodies a battery manufacturing apparatus according to the present invention will be described with reference to FIGS. 1 and 2.
In addition, the following description is given on the assumption that the direction of the arrow a in FIG. 1 indicates the conveyance direction of the electrode foil (more specifically, the current collector sheet 50).

The coating apparatus 1 is an apparatus for manufacturing an electrode foil used as an electrode of, for example, a lithium ion secondary battery.
The coating apparatus 1 is mainly configured by a first coating unit 2, a reversing unit 3, a second coating unit 4, a control device 5 that controls the operation of the entire coating apparatus 1, and the like.

First, the first coating part 2 will be described.
The first coating unit 2 is a mechanism for applying the paste material 52 to the “surface” of the strip-shaped current collector sheet 50.
The first coating unit 2 includes a feeding device 21, a foil splicing device 22, a first discharge device 23, a first drying furnace 24, and the like.

The current collector sheet 50 is a member that becomes a substrate of an electrode foil, and is formed from a sheet-like metal foil that is arbitrarily used depending on the type and application of the electrode foil to be manufactured, such as an aluminum foil and a copper foil. Is done.
The paste material 52 is formed from a slurry-like fluid in which an electrode active material (positive electrode active material or negative electrode active material) to which a solvent is added and a binder are mixed.

  The feeding device 21 has a current collector sheet 50 wound in a roll shape (hereinafter, the current collector sheet 50 wound in a roll shape is referred to as a “current collector roll 50 a”) as a first discharge device 23. This is a device for feeding and applying tension to the fed current collector sheet 50.

The feeding device 21 is provided with a drive motor 21a, a rotating shaft 21b that is inserted into the shaft center of the current collector roll 50a and supports the current collector roll 50a, and the like.
The output shaft of the drive motor 21a is drivingly connected to the rotating shaft 21b via a connection mechanism (not shown).
The driving force of the drive motor 21a is transmitted to the rotating shaft 21b, and the current collector roll 50a is driven to rotate about the axis, whereby the current collector sheet 50 is fed out to the coating apparatus 1.

The speed at which the current collector sheet 50 is fed from the feeding device 21 (first feeding speed V1 shown in FIG. 1) is the speed at which the current collector sheet 50 is fed from the nip roller device 32 described later (FIG. 1). The drive motor 21a is controlled so as to be slower than the second feeding speed V2) shown.
That is, by controlling the rotational speed of the drive motor 21a in this way, in the region extending from the feeding device 21 to the nip roller device 32, the current collector sheet 50 has a high load tension acting in the conveying direction. It has come to be added.

Next, the foil splicing device 22 will be described.
The foil splicing device 22 uses the remaining current collector roll 50a (hereinafter referred to as “old current collector roll 50a”) as a new current collector roll 50a (hereinafter referred to as “new current collector roll 50a”). When exchanging them, the end portions of the current collector sheets 50 and 50 wound around the old and new current collector rolls 50a and 50a are joined to each other by the adhesive tape 51 and connected (foiled). It is an apparatus for performing a splicing operation.

The foil splicing device 22 includes a foil splicing portion 22a, a drive motor 22b for driving the foil splicing portion 22a, and the like.
The foil splicing portion 22a is configured to be openable and closable, and is normally held in an “open state” when the foil splicing operation is not performed. The current collector sheet 50 fed out from the feeding device 21 is the foil splicing portion 22a. And is sent to a first discharge device 23 to be described later.

  Then, when replacing the remaining old collector roll 50a with a new new collector roll 50a, the end portion of the collector sheet 50 wound around the old collector roll 50a and the new collector roll 50a The sheet is fed into the foil splicing device 22 in a state in which the current collector sheet 50 wound around the electric roll 50a is combined with the starting end.

  And when the part which match | combined the terminal part of the collector sheet 50 by the side of the old collector roll 50a and the start end part of the collector sheet 50 by the side of the new collector roll 50a passes through the foil splicing part 22a In addition, the drive motor 22b is activated and the foil splicing portion 22a is in the “closed state”. As a result, the combined portion of the end portion and the start end portion is sandwiched by the foil joint portion 22 a together with the adhesive tape 51 and joined by the adhesive tape 51. The current collector sheet 50 on the side of the old current collector roll 50a and the start end portion of the current collector sheet 50 on the side of the new current collector roll 50a are joined to each other by the adhesive tape 51. 50 is connected (foil spliced).

Next, the first discharge device 23 will be described.
The first discharge device 23 is a device for applying the paste material 52 to the current collector sheet 50.
The first discharge device 23 includes a discharge unit 25, a supply unit 26, a decompression unit 27, a backup roll 28, and the like.

  The discharge unit 25 is a part that discharges the paste material 52 supplied from the supply unit 26 toward the current collector sheet 50, and includes a die 25A, a decompression chamber 25B, a movable unit 25C, and the like.

The die 25A is made of a substantially rectangular parallelepiped member, and is arranged to face the backup roll 28 so that the longitudinal direction thereof is parallel to the axial direction of the backup roll 28.
On the other hand, the backup roll 28 is disposed such that the axial direction is the width direction of the current collector sheet 50 (a direction orthogonal to the conveyance direction of the current collector sheet 50 in plan view), and is rotatably supported. The

  Then, the current collector sheet 50 that has passed through the foil splicing device 22 is guided to the backup roll 28 via the guide roller 29 and then wound around the backup roll 28 while the backup roll 28 and the die 25A are The first drying furnace 24, which will be described later, is guided through the guide roller 30.

  A lip portion 25a protruding toward the backup roll 28 is formed on the side surface portion of the die 25A on the backup roll 28 side so as to extend along the longitudinal direction. And the slit 25b is formed in the protrusion side end surface part of the said lip | rip part 25a along a longitudinal direction.

The dimension in the longitudinal direction of the slit 25b is substantially the same as the width dimension of the paste material 52 applied to the current collector sheet 50 (the dimension in the direction perpendicular to the transport direction of the current collector sheet 50). Formed.
The slit 25b communicates with a space (hereinafter referred to as “material reservoir 25c”) formed inside the die 25A, and the paste material 52 stored in the material reservoir 25c passes through the slit 25b. Then, the ink is discharged toward the current collector sheet 50 wound around the backup roll 28.

The decompression chamber 25B is formed in a substantially box shape covering the space on the upstream side of the lip portion 25a (upstream side with respect to the conveying direction of the current collector sheet 50; the same applies hereinafter) between the die 25A and the backup roll 28. .
That is, when the paste material 52 is applied to the current collector sheet 50 that is wound around the backup roll 28 and conveyed between the die 25A and the backup roll 28, the entire lip portion 25a in the longitudinal direction is applied. The upstream space across the region is isolated from the surrounding atmosphere by the lip portion 25a, the discharged paste material 52, the current collector sheet 50 wound around the backup roll 28, and the decompression chamber 25B. It has become.

  A decompression unit 27 described later communicates with the decompression chamber 25B via a suction hose 27b. When the paste material 52 is discharged to the current collector sheet 50, the decompression unit 27 causes the interior of the decompression chamber 25B to be discharged. The pressure is always reduced.

  The movable portion 25C supports the die 25A and moves the die 25A in the forward direction (the direction approaching the backup roll 28) and the backward direction (the direction separating from the backup roll 28). And a drive motor 25e for driving the guide mechanism portion 25d.

  Then, by driving the drive motor 25e and moving the die 25A via the guide mechanism portion 25d, a gap between the protruding end surface portion of the lip portion 25a and the current collector sheet 50 wound around the backup roll 28 is obtained. The dimension (hereinafter referred to as “die gap”) can be freely changed by the movable portion 25C.

The supply unit 26 is a mechanism for supplying the paste material 52 to the die 25A and applying a discharge pressure when the paste material 52 is discharged from the lip portion 25a to the die 25A.
The supply unit 26 includes a pump 26b that communicates with the die 25A via a piping member 26a, an input tank 26c that is connected to an input port of the pump 26b, a drive motor 26d that operates the pump 26b, and the like. .

  When the drive motor 26d is driven in the supply unit 26 having such a configuration, the paste material 52 charged into the charging tank 26c is discharged by the pump 26b and sent to the die 25A through the piping member 26a.

  Then, the paste material 52 that has reached the die 25A is temporarily stored in the material reservoir 25c inside the die 25A, and then discharged to the current collector sheet 50 through the slit 25b of the lip portion 25a.

The decompression unit 27 is a mechanism for decompressing the interior of the decompression chamber 25 </ b> B when the paste material 52 is applied to the current collector sheet 50.
The decompression unit 27 includes a known blower device 27a, a suction hose 27b that communicates the blower device 27a and the decompression chamber 25B, and the like, and an electromagnetic decompression adjustment valve 27c is arranged in the middle of the suction hose 27b. Established.

  When the paste material 52 is discharged from the lip portion 25a of the die 25A, the blower device 27a is operated to forcibly discharge the air in the decompression chamber 25B to the outside, and the decompression adjustment valve 27c is controlled to control the air. By adjusting the discharge amount, the pressure in the decompression chamber 25B is maintained in an appropriate decompressed state.

Next, the first drying furnace 24 will be described.
The first drying furnace 24 is an apparatus for drying the paste material 52 applied by the first discharge device 23 and fixing the paste material 52 to the surface of the current collector sheet 50.
The first drying furnace 24 is composed of a substantially box-shaped room extending along the conveying direction of the current collector sheet 50, and a plurality of known heaters are provided therein.
Then, while the current collector sheet 50 is conveyed in the first drying furnace 24, the paste material 52 applied to the current collector sheet 50 is heated and gradually dried, and the solvent is evaporated and dried. The paste material 52 is fixed to the surface of the current collector sheet 50.

Subsequently, the reversing unit 3 will be described.
The reversing unit 3 is a mechanism that reverses the front and back surfaces of the current collector sheet 50 being conveyed.
The reversing unit 3 includes an air turn device 31, nip roller devices 32 and 32, and the like.

The air turn device 31 is a device for inverting the front surface and the back surface of the current collector sheet 50 while winding the current collector sheet 50.
The air turn device 31 includes a plurality of air turn rollers 31a, 31a (only one air turn roller 31a is schematically shown in FIG. 1), a known blower device 31b, and these air turn rollers 31a, 31a,. And a blower device 31b. The electromagnetic pressure regulating valve 31d is disposed in the middle of the communication pipe 31c.

The air turn rollers 31a, 31a,... Are arranged along the sides of a polygon such as a triangle or a quadrangle in a plan view, for example.
The current collector sheet 50 fed into the air turn device 31 is slid in the axial direction of the air turn roller 31a while being wound around each air turn roller 31a between the air turn rollers 31a, 31a. The air turn device 31 is finally carried out from the air turn device 31 in a state where the front surface and the back surface are reversed.

In addition, innumerable fine holes are perforated on the conveying surfaces of the air turn rollers 31a, 31a... (The outer circumferential surface around which the current collector sheet 50 is wound). The compressed air blown from the device 31b is ejected from the conveying surfaces of these air turn rollers 31a, 31a, ... through the fine holes.
By having such a configuration, the current collector sheet 50 wound around each air turn roller 31a floats from the conveying surface of the air turn roller 31a by the compressed air, and the frictional resistance is reduced and smoothly. It is designed to be transported.

  The pressure of the compressed air ejected from the conveying surfaces of the air turn rollers 31a, 31a,... Is always maintained at a predetermined appropriate pressure by the pressure adjusting valve 31d.

Next, the nip roller device 32 will be described.
The nip roller device 32 divides the tension applied to the current collector sheet 50 in the reversing unit 3 and other processes (specifically, the first coating unit 2 and the second coating unit 4). It is a device.

  That is, in the first coating unit 2 and the second coating unit 4 to be described later, the current collector sheet 50 is not peeled off from the outer peripheral surface of the backup roll 28 due to the decompression in the decompression chamber 25B by the decompression unit 27. Therefore, it is necessary to apply a high load tension to the current collector sheet 50.

  On the other hand, in the reversing unit 3, the current collector sheet 50 put into the air turn device 31 is slid in the axial direction of the air turn roller 31a while being wound around each air turn roller 31a in a state of being lifted from the conveyance surface. Therefore, it is necessary to apply a low load tension to the current collector sheet 50.

  For this reason, in the coating apparatus 1 according to the present embodiment, two nip roller devices 32 and 32 are disposed on the upstream side and the downstream side of the air turn device 31, respectively. The tension applied to the current collector sheet 50 is isolated between the reversing unit 3 and other processes.

The nip roller device 32 includes a pair of driving rollers 32a and a driven roller 32b, and a lifting device 32c that moves the driving roller 32a up and down.
The driving roller 32a and the driven roller 32b are arranged in such a manner that the axial direction is the width direction of the current collector sheet 50 (a direction perpendicular to the conveyance direction of the current collector sheet 50). The shafts are rotatably supported and are disposed to face each other with the current collector sheet 50 interposed therebetween.
The drive roller 32a is provided with a first drive motor 32d that rotationally drives the drive roller 32a around the axis.

  Further, the driving roller 32a is provided with an elevating device 32c, and the driving roller 32a is moved toward and away from the driven roller 32b by the elevating device 32c (the conveying direction of the current collector sheet 50 and the axial direction of the driving roller 32a). In the orthogonal direction).

  That is, when the driving roller 32a is moved in the descending direction (direction approaching the driven roller 32b) by the lifting device 32c, the nip roller device 32 is in the “closed state” and the driving roller 32a is in the ascending direction ( The nip roller device 32 is in the “open state” by being moved in a direction away from the driven roller 32b.

  The lifting device 32c is provided with a second drive motor 32e, and the lifting device 32c is operated by driving the second drive motor 32e.

  When the nip roller device 32 is in the “closed state”, the current collector sheet 50 is sandwiched between the drive roller 32a and the driven roller 32b. Moreover, the current collector sheet 50 is fed out to the downstream side in the transport direction by rotationally driving the drive roller 32a by the first drive motor 32d.

  Here, as described above, in the nip roller device 32 (the nip roller device 32A in FIG. 1) disposed on the upstream side of the air turn device 31, the speed at which the current collector sheet 50 is fed from the nip roller device 32A ( The first drive is performed such that the second feeding speed V2) shown in FIG. 1 is faster than the speed at which the current collector sheet 50 is fed from the feeding device 21 (first feeding speed V1 shown in FIG. 1). The motor 32d is controlled.

  Further, in the nip roller device 32 (nip roller device 32B in FIG. 1) disposed on the downstream side of the air turn device 31, the speed at which the current collector sheet 50 is fed from the nip roller device 32B (the first shown in FIG. 1). The first driving motor 32d is controlled so that the three feeding speed V3) is slower than the speed (fourth feeding speed V4 shown in FIG. 1) at which the current collector sheet 50 is wound by the winding device 43 described later. Has been.

  It should be noted that the speed at which the current collector sheet 50 is fed from both the nip roller devices 32A and 32B (second feeding speed V2 and third feeding speed V3 shown in FIG. 1) is substantially the same. One drive motor 32d is controlled.

  Thus, the tension applied to the current collector sheet 50 is controlled by controlling the rotational speeds of the first drive motors 32d and 32d provided in the drive rollers 32a and 32a of the nip roller devices 32A and 32B, respectively. It can be reliably divided into a high load state in the first coating part 2 and the second coating part 4 and a low load state in the reversing part 3.

Then, the 2nd coating part 4 is demonstrated.
The second coating unit 4 is a mechanism for coating the paste material 52 on the “back surface” of the strip-shaped current collector sheet 50.
The second coating unit 4 includes a second discharge device 41, a second drying furnace 42, a winding device 43, and the like.

The second discharge device 41 is a device for discharging the paste material 52 to the back surface of the current collector sheet 50 whose surface and back surface are reversed by the air turn device 31.
Further, the second drying furnace 42 dries the paste material 52 applied to the back surface of the current collector sheet 50 by the second discharge device 41, and fixes the paste material 52 to the back surface of the current collector sheet 50. Mechanism.

  The second discharge device 41 and the second drying furnace 42 have the same main structure as that of the first discharge device 23 and the first drying furnace 24 described above, and thus detailed description thereof is omitted.

  The winding device 43 winds up the current collector sheet 50 coated with the paste material 52 on the front surface and the back surface in a roll shape, and is fed from a nip roller device 32B disposed on the downstream side of the air turn device 31. This is a device for applying tension to the current collector sheet 50.

The winding device 43 is provided with a drive motor 43a, a bobbin 43b that winds up the current collector sheet 50, and a rotary shaft 43c that is inserted into the shaft center of the bobbin 43b to support the bobbin 43b. The
An output shaft of the drive motor 43a is drivingly connected to the rotating shaft 43c through a connection mechanism (not shown).
And the drive force of the drive motor 43a is transmitted to the rotating shaft 43c, and the bobbin 43b is rotationally driven centering | focusing on an axial center, Therefore The collector sheet 50 is wound up by the bobbin 43b at roll shape.

As described above, the speed at which the current collector sheet 50 is wound around the bobbin 43b by the winding device 43 (fourth feeding speed V4 shown in FIG. 1) is the nip roller disposed on the downstream side of the air turn device 31. The drive motor 43a is controlled so as to be faster than the speed at which the current collector sheet 50 is fed out from the device 32B (third feeding speed V3 shown in FIG. 1).
That is, by controlling the rotational speed of the drive motor 43a in this manner, the current collector sheet 50 is directed upstream and downstream in the conveying direction in the region from the nip roller device 32B to the winding device 43. A high-load tension acting as described above is applied.

Next, the control device 5 will be described.
The control device 5 is electrically connected to each device group constituting the first coating unit 2, the reversing unit 3, and the second coating unit 4, and controls the overall operation of the coating device 1. .
The control device 5 is mainly configured by an input unit, a storage unit, and the like (not shown).

A touch panel for inputting manufacturing conditions (for example, a conveyance speed of the current collector sheet 50 and temperature conditions of the first drying furnace 24 and the second drying furnace 42) for manufacturing the electrode foil to the control device 5. Various detectors such as encoders (not shown) disposed in the drive motors 21a and 43a of the feeding device 21 and the winding device 43 are connected as input means.
In addition, the control device 5 is connected to a drive motor of each device group constituting the first coating unit 2, the reversing unit 3, and the second coating unit 4 as output means.

The control device 5 includes a storage unit mainly including a RAM and a ROM, an arithmetic processing unit including a CPU, and the like.
Various programs relating to the operation of the coating apparatus 1 are stored in the storage unit. In addition, information input from the input unit in response to an instruction from the arithmetic processing unit is temporarily stored in the storage unit.

And if the manufacturing conditions of electrode foil are input into the control apparatus 5 via an input means, the input information will be once stored in a memory | storage part.
Thereafter, when an electrode foil manufacturing start command is given to the control device 5 via the input means, the control device 5 receives information on manufacturing conditions from the storage unit, the first coating unit 2, the reversing unit 3 and the second. Production of electrode foil is performed by reading out a program necessary for operation of each device group constituting the coating unit 4 and executing arithmetic processing by the arithmetic processing unit, and sending a command to each output means based on the arithmetic result. Is done.

Incidentally, the storage unit of the control device 5 stores in advance map information 10 relating to the operation of the discharge units 25 and 25 of the first coating unit 2 and the second coating unit 4 during the foil splicing operation.
As shown in FIG. 2, the map information 10 is configured such that an appropriate die gap value is selected in relation to the degree of reduced pressure and the coating width.
That is, in the map information 10, the degree of pressure reduction and the coating width are defined as variables that can be selected, and an appropriate die gap is determined with respect to the arbitrarily selected relationship between the degree of pressure reduction and the coating width. It is configured by displaying the values a1, a2,.

Here, the “decompression degree” is the pressure difference between the pressure in the decompression chamber 25B and the normal pressure, that is, the pressure of the air in the decompression chamber 25B that is forcibly exhausted to the outside by the blower device 27a of the decompression unit 27. Indicates.
The “coating width” indicates a width dimension of the paste material 52 applied to the current collector sheet 50 (a dimension in a direction orthogonal to the current collector sheet 50 in a plan view).

  Then, as will be described later, by using the map information 10 having such a configuration, in the coating apparatus 1 in the present embodiment, the coating material 52 is poorly applied to the current collector sheet 50 at the time of the foil splicing operation. The period (specifically, the period during which the discharge of the paste material 52 to the current collector sheet 50 is stopped) can be reduced as much as possible.

[Operation during foil splicing]
Next, the operation | movement in the foil splicing operation | work of the coating apparatus 1 which embodies the manufacturing apparatus of the battery which concerns on this invention is demonstrated using FIG. 3 and FIG.
First, when a foil splicing command is input to the control device 5 via the input means, the control device 5 uses the map information 10 to control the decompression adjustment valve 27c of the decompression unit 27 and the drive motor 25e of the discharge unit 25. An output signal is transmitted to, and the reduced pressure state in the reduced pressure chamber 25B is gradually released (changed to the normal pressure state), and the value of the die gap is adjusted (step S101).

Specifically, as shown in FIG. 2, for example, when an electrode foil having a coating width of X1 [mm] is manufactured by the coating apparatus 1, the control apparatus 5 changes the atmospheric pressure in the decompression chamber 25 </ b> B. Y5 [kPa], Y4 [kPa], Y3 [kPa]... (However, Y5>Y4>Y3>...) Are gradually increased and gradually reduced so that the reduced pressure state is released. An output signal is transmitted to the regulating valve 27c.
On the other hand, the control device 5 determines that the die gap values are a5 [mm], a4 [mm], a3 [mm]... (However, a5 >A4>a3>) and an output signal is transmitted to the drive motor 25e so as to gradually change stepwise.

  The pressure reducing adjustment valve 27c and the drive motor 25e that have received these electric signals gradually change the pressure inside the pressure reducing chamber 25B and the value of the die gap step by step, and the pressure becomes the normal pressure. At this point, the output of electric signals to the pressure reducing adjustment valve 27c and the drive motor 25e is temporarily stopped.

When the atmospheric pressure in the decompression chamber becomes a normal pressure, the control device 5 transmits an output signal to the drive motor 21 a of the feeding device 21.
The drive motor 21a that has received the output signal gradually increases the rotational speed, and gradually reduces the tension applied to the current collector sheet 50 in the first coating unit 2 (step S102).

Thereafter, the control device 5 sets the speed of the current collector sheet 50 fed from the feeding device 21 (the first feeding speed V1 shown in FIG. 1) to the speed of the current collector sheet 50 fed from the nip roller device 32A ( It is determined whether or not the second feeding speed V2) shown in FIG.
That is, the control device 5 determines whether or not the tension applied to the current collector sheet 50 in the first coating unit 2 is equal to the tension applied to the current collector sheet 50 in the reversing unit 3. (Step S103).

  When it is determined that the tension applied to the current collector sheet 50 in the first coating unit 2 and the reversing unit 3 is the same value, the control device 5 temporarily holds the rotational speed of the drive motor 21a in this state. To do.

On the other hand, when it is determined that the tension applied to the current collector sheet 50 in the first coating unit 2 and the reversing unit 3 is not yet the same value, the control device 5 further increases the rotational speed of the drive motor 21a. The tension applied to the current collector sheet 50 in the first coating unit 2 is lowered (step S102).
And the control apparatus 5 increases the rotational speed of the drive motor 21a until it judges that the tension | tensile_strength added to the electrical power collector sheet 50 in the 1st coating part 2 and the inversion part 3 is the same value mutually.

When the rotational speed of the drive motor 21 a of the feeding device 21 is maintained, the control device 5 transmits an output signal to the drive motor 22 b of the foil splicing device 22.
The drive motor 22b that has received the output signal starts driving, and operates the foil splicing portion 22a to perform the foil splicing operation (step S104).
The rear end portion of the current collector sheet 50 wound around the old current collector roll 50a and the start end portion of the current collector sheet 50 wound around the new current collector roll 50a are adhesive tape. By being spliced together by 51, both current collector sheets 50 and 50 are connected (foil spliced), and a foil spliced portion is formed.

When the foil splicing operation by the foil splicing device 22 is completed, the drive motor 22b stops, and then the control device 5 transmits an output signal to the drive motor 26d of the supply unit 26.
The drive motor 26d that has received the output signal stops driving, stops the operation of the pump 26b, and temporarily stops the discharge of the paste material 52 by the die 25A (step S105).

Once the discharge of the paste material 52 by the die 25 </ b> A is stopped, the control device 5 transmits an output signal to the drive motor 25 e of the movable unit 25 </ b> C in the discharge unit 25.
The drive motor 25e that has received the output signal starts driving and moves the position of the die 25A to the rear end portion (the end portion in the direction away from the backup roll 28) via the guide mechanism portion 25d. (Step S106) and stop.

  Thereafter, the control device 5 determines whether or not the foil joint location in the current collector sheet 50 has passed through a position between the die 25A and the backup roll 28 (hereinafter referred to as “first passing position”). (Step S107) When it is determined that the foil joint has passed the first passage position, the control device 5 transmits an output signal to the drive motor 25e of the discharge unit 25 again.

  The drive motor 25e that has received the output signal starts driving again, and restores the position of the die 25A to the position before moving to the rear end in step S106 via the guide mechanism 25d. Stop (by moving forward) (step S108).

  On the other hand, if it is determined that the foil joining location in the current collector sheet 50 has not yet passed through the first passage position, the control device 5 does not transmit an output signal to the drive motor 25e, and the foil joining location is again. The determination as to whether or not the first passage position has passed is repeated.

  In step S107, whether or not the foil joint has passed the first passage position is determined by directly detecting the foil joint using a detector such as an optical sensor or a magnet sensor. Alternatively, a timer circuit may be provided in the program stored in the control device 5, and the time from when the current collector sheet 50 leaves the foil splicing device 22 until it reaches the first passage position (hereinafter, (Denoted as “arrival time T1”) may be input to the timer circuit in advance, and it may be determined that the foil joint has passed the first passage position as the arrival time T1 elapses.

When the position of the die 25A is restored (advanced) to the position before moving to the rear end in step S106, the control device 5 transmits an output signal to the drive motor 26d of the supply unit 26.
Then, the drive motor 26d that has received the output signal restarts driving to start the operation of the pump 26b, and starts to discharge the paste material 52 by the die 25A (step S109).

Thus, when performing the foil splicing operation by the coating apparatus 1 in the present embodiment, the period during which the discharge of the paste material 52 to the current collector sheet 50 is stopped (hereinafter referred to as “coating failure period”). ) Is limited to a certain time from step S105 to step S108.
That is, the discharge of the paste material 52 to the current collector sheet 50 is stopped from the start of the foil splicing operation until the foil splicing operation is completely completed as in the foil splicing operation in the conventional coating apparatus. It is never done.
Therefore, in the coating apparatus 1 in a present Example, the yield of the electrode foil manufactured can be improved and the production amount can be improved.

  When the discharge of the paste material 52 by the die 25A is started, the control device 5 determines that the foil joint location in the current collector sheet 50 is a position near the upstream side of the nip roller device 32A (hereinafter referred to as “second passage position”). It is determined whether or not (step S110). When it is determined that the foil joint has reached the second passage position, the control device 5 transmits an output signal to the second drive motor 32e of the nip roller device 32A.

  The second drive motor 32e that has received the output signal starts to drive, raises the drive roller 32a via the lifting device 32c, and sets the nip roller device 32A to the “open state” (step S111).

  On the other hand, if it is determined that the foil joint location in the current collector sheet 50 has not yet reached the second passage position, the control device 5 does not transmit an output signal to the second drive motor 32e, and again the foil. The determination as to whether or not the joint has reached the second passage position is repeated.

  In step S110, whether or not the foil joint location has reached the second passage position is determined by directly detecting the foil joint location using a detector such as an optical sensor or a magnet sensor. Alternatively, a timer circuit may be provided in the program stored in the control device 5, and the time from when the current collector sheet 50 leaves the foil splicing device 22 until it reaches the second passage position (hereinafter, (Denoted as “arrival time T2”) may be input to the timer circuit in advance, and it may be determined that the foil joint has reached the second passage position as the arrival time T2 elapses.

  When the nip roller device 32A is in the “open state”, the control device 5 determines whether or not the foil joint portion in the current collector sheet 50 has passed through the nip roller device 32A (step S112). And if it judges that the foil joint location passed the nip roller apparatus 32A, the control apparatus 5 will again transmit an output signal to the 2nd drive motor 32e of the nip roller apparatus 32A.

  The second drive motor 32e that has received the output signal starts to drive, lowers the drive roller 32a via the lifting device 32c, and sets the nip roller device 32A to the “closed state” again (step S113).

  On the other hand, if it is determined that the foil joining portion in the current collector sheet 50 has not yet passed through the nip roller device 32A, the control device 5 does not transmit the output signal to the second drive motor 32e, and again the foil. The determination as to whether or not the joint portion has passed through the nip roller device 32A is repeated.

  In step S112, the determination as to whether or not the foil joint location has passed through the nip roller device 32A is made, for example, by directly detecting the foil joint location using a detector such as an optical sensor or a magnet sensor. Alternatively, a timer circuit is provided in the program stored in the control device 5, and the time from when the current collector sheet 50 exits the foil splicing device 22 until it passes through the nip roller device 32A (hereinafter, “Denoted as“ passing time T3 ”) may be input to the timer circuit in advance, and it may be determined that the foil splicing point has passed through the nip roller device 32A as the passing time T3 elapses.

When the nip roller device 32A is in the “closed state”, the control device 5 transmits an output signal to the drive motor 21a of the feeding device 21 again.
Then, the drive motor 21a that has received the output signal gradually reduces the rotational speed, and the tension applied to the current collector sheet 50 in the first coating unit 2 increases the rotational speed in step S102. It returns to the previous tension (step S114).

  When the tension applied to the current collector sheet 50 in the first coating unit 2 is restored, the control device 5 determines, based on the map information 10, the decompression adjustment valve 27c of the decompression unit 27, the drive motor 25e of the discharge unit 25, and the like. The pressure signal in the decompression chamber 25B is gradually restarted (decompression is advanced), and the die gap value is adjusted (step S115).

  When the decompressed state in the decompression chamber 25B is restored to the state before the decompressed state in the decompression chamber 25B is released in step S101, the foil splicing operation in the first coating unit 2 is completed.

  In addition, if the foil splicing operation in the first coating unit 2 is completed, the foil splicing portion of the current collector sheet 50 passes through the reversing unit 3 and is conveyed to the second coating unit 4. Even in this case, the nip roller device 32B, the second discharge device 41, and the winding device 43 are based on the above-described steps S101 to S115 (more specifically, step S104 is excluded). The nip roller device 32A, the first discharge device 23, and the feeding device 21 are respectively moved correspondingly.

  As described above, the battery manufacturing method embodying the present invention includes a coating step of applying the paste material 52 while applying a high load tension to the belt-like current collector sheet 50 under reduced pressure. After completion of the coating process, the current collector sheet 50 is applied to the outer peripheral surface of the air turn roller 31a while applying a low load tension to the current collector sheet 50 compared to the tension applied in the coating process. And a reversing step of reversing the front and back surfaces of the current collector sheet 50 while sliding the electrode foil by a manufacturing process comprising: foil for joining the current collector sheet 50 together Supplying the current collector sheet 50 to the coating process during the splicing operation includes a decompression release process (step S101) for changing the reduced pressure state in the coating process to a normal pressure state, and the reduced pressure release process (step). S101 Is completed, the tension applied to the current collector sheet 50 in the coating process is reduced to the tension in the reversing process (steps S102 and S103), and the tension reducing process (steps S102 and S103). ) Is completed, the front end portion of the second current collector sheet 50 to be newly supplied is connected to the rear end portion of the first current collector sheet 50, and the connected current collector sheet 50 is applied. It is supposed to be performed by a supply process including a foil splicing process (step S104) to be conveyed to the construction process.

  The battery manufacturing apparatus embodying the present invention includes a backup roll 28 around which a belt-like current collector sheet 50 conveyed in a state where a high load tension is applied, and the current collector sheet 50. Between the backup roll 28 and the die 25A, and a die 25A that is provided opposite to the backup roll 28 with a gap therebetween and is disposed so as to be movable toward and away from the backup roll 28. A first coating part 2 (second coating part 4) having a decompression part (decompression means) 27 for decompressing the current collector, and a current collector sheet 50 of the first coating part 2 (second coating part 4) Provided on the downstream side in the transport direction, while sliding the current collector sheet 50 to which a low load tension is applied compared to the first coating part 2 (second coating part 4) on the outer peripheral surface, An electric current that reverses the front and back surfaces of the current collector sheet 50 A reversing unit 3 having a turn roller 31a, and a foil splicing device that is provided on the upstream side of the first coating unit 2 (second coating unit 4) and joins and connects the two current collector sheets 50 together (Foil splicing part) 22 is a battery manufacturing apparatus that manufactures an electrode foil with the coating apparatus 1, and the current collector sheet at the time of a foil splicing operation for splicing the current collector sheet 50 50 is supplied to the first coating unit 2 (second coating unit 4) by changing the pressure reduction state of the gap between the backup roll 28 and the die 25A by the pressure reduction unit (pressure reduction means) 27 to a normal pressure state. After the gap between the backup roll 28 and the die 25A reaches normal pressure, the tension applied to the current collector sheet 50 in the first coating part 2 (second coating part 4) is reduced. The tension is applied to the current collector sheet 5 at the reversing unit 3. Of the second current collector sheet 50 to be newly supplied to the rear end portion of the first current collector sheet 50 by the foil splicing device (foil splicing portion) 22. The front end portions are joined and connected, and the connected current collector sheet 50 is conveyed to the first coating portion 2 (second coating portion 4).

  By having such a configuration, according to the battery manufacturing method and the battery manufacturing apparatus of the present embodiment, the battery manufacturing method by the coating apparatus capable of performing the foil splicing operation that prevents the decrease in the production amount as much as possible. Further, it is possible to provide a technique related to a manufacturing apparatus.

  That is, in the coating apparatus 1 in the present embodiment, when performing a foil splicing operation in order to supply a new current collector sheet 50, first, the first coating unit 2 (or the second coating unit 4). The decompression state in the decompression chamber 25B is gradually released to the normal pressure state, and the tension applied to the current collector sheet 50 is reduced to the tension in the reversing unit 3. Foil splicing work is to be carried out.

Therefore, even when the decompressed state in the decompression chamber 25 </ b> B is being released, the ejection unit 25 can continue ejecting the paste material 52 onto the current collector sheet 50.
In addition, before the foil splicing operation is performed, the tension applied to the current collector sheet 50 in each of the first coating unit 2 (or the second coating unit 4) and the reversing unit 3 is already Therefore, even if the nip roller device 32 is set to the “open state”, rubbing does not occur between the current collector sheet 50 and the air turn roller 31a.

For this reason, in the discharge unit 25, only while the foil joint portion of the current collector sheet 50 passes (specifically, only during steps S105 to S108 in FIG. 3), the current collector sheet 50 is moved to the current collector sheet 50. It is only necessary to stop the discharge of the paste material 52, and from the start of the foil splicing operation to the current collector sheet 50 until the foil splicing operation is completely completed as in the case of the foil splicing operation in the conventional coating apparatus. Compared with the fact that the discharge of the paste material 52 is stopped, the paint failure period can be greatly shortened.
Therefore, according to the coating apparatus 1 in the present embodiment, the yield of the manufactured electrode foil can be greatly improved, and the production amount of the electrode foil can be improved.

  In the battery manufacturing method embodying the present invention, in the decompression release step (step S101), the gap size between the die 25A and the current collector sheet 50 is determined for each decompression value by the map information 10. It is determined in advance, and the gap size is changed in accordance with the change in the reduced pressure value.

  In the battery manufacturing apparatus embodying the present invention, in the first coating unit 2 (second coating unit 4), the gap size between the die 25A and the current collector sheet 50 is map information. 10 is determined in advance for each decompression value of the decompression unit (decompression unit) 27, and when the decompression unit (decompression unit) 27 of the first coating unit 2 (second coating unit 4) is gradually released. With the change in the reduced pressure value, the die 25A is moved toward and away from the backup roll 28.

  By having such a configuration, according to the battery manufacturing method and the battery manufacturing apparatus in the present embodiment, even in the middle of releasing the decompressed state in the decompression chamber 25B, the discharge unit 25 The paste material 52 can be discharged to the current collector sheet 50 while maintaining a high-quality coating state.

DESCRIPTION OF SYMBOLS 1 Coating apparatus 2 1st coating part 3 Inversion part 4 2nd coating part 10 Map information 22 Foil joining apparatus (foil joining part)
25A die 25B decompression chamber 27 decompression part (decompression means)
28 Backup Roll 31a Air Turn Roller 50 Current Collector Sheet 52 Paste Material S101 Depressurization Release Process S102 Tension Reduction Process S103 Tension Reduction Process S104 Foil Splicing Process

Claims (4)

A coating process for applying a paste material while applying a high load tension to the belt-shaped current collector sheet under reduced pressure;
After completion of the coating process, while applying a low load tension to the current collector sheet compared to the tension applied in the coating process, while sliding the current collector sheet on the outer peripheral surface of the air turn roller, A reversing step of reversing the front and back surfaces of the current collector sheet;
A battery manufacturing method for manufacturing an electrode foil by a manufacturing process comprising:
Supplying the current collector sheet to the coating process at the time of foil joining work for joining the current collector sheet,
A reduced pressure release step for changing the reduced pressure state in the coating step to a normal pressure state;
After the completion of the decompression release step, a tension reduction step for reducing the tension applied to the current collector sheet in the coating step to the tension in the reversing step;
After completion of the tension reducing step, the front end portion of the second current collector sheet to be newly supplied is connected to the rear end portion of the first current collector sheet, and the connected current collector sheet is applied. Foil splicing process to transport to the construction process,
Performed by a supply process comprising:
A battery manufacturing method characterized by the above. In the decompression release step,
The gap dimension between the die and the current collector sheet is predetermined for each reduced pressure value,
The gap size is changed in accordance with the change in the reduced pressure value.
The method for producing a battery according to claim 1, wherein: A backup roll around which a belt-shaped current collector sheet conveyed with high load tension is wound;
A die provided opposite to the backup roll with the current collector sheet sandwiched therebetween, and disposed so as to be movable toward and away from the backup roll;
Decompression means for decompressing the gap between the backup roll and the die;
A coating part having
Provided on the downstream side in the current collector sheet conveying direction of the coating part,
A reversing portion having an air turn roller for reversing the front and back surfaces of the current collector sheet while sliding the current collector sheet to which a low load tension is applied compared to the coating portion on the outer peripheral surface, and the coating Foil joint that is provided on the upstream side of the construction part and joins and connects the two current collector sheets,
A battery manufacturing apparatus for manufacturing an electrode foil by a coating apparatus comprising:
The supply of the current collector sheet to the coating part at the time of the foil joining operation for joining the current collector sheet,
Change the reduced pressure state of the gap between the backup roll and the die by the pressure reducing means to a normal pressure state,
After the gap between the backup roll and the die reaches normal pressure, the tension applied to the current collector sheet at the coating part is reduced,
After the tension becomes equal to the tension applied to the current collector sheet at the reversing part, the foil joint part newly supplies the second current to the rear end part of the first current collector sheet. The front end of the current collector sheet is connected and connected, and the connected current collector sheet is conveyed to the coating part,
A battery manufacturing apparatus. In the coating part,
The gap dimension between the die and the current collector sheet is predetermined for each reduced pressure value of the decompression means,
When gradually releasing the pressure reducing means of the coating part,
With the change in the reduced pressure value,
Moving the die in the proximity and separation direction with respect to the backup roll;
The battery manufacturing apparatus according to claim 3, wherein:

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