WO2015162746A1

WO2015162746A1 - Rolled sheet-material holding device and battery laminate body manufacturing method

Info

Publication number: WO2015162746A1
Application number: PCT/JP2014/061527
Authority: WO
Inventors: 星野　明; 景祥石橋
Original assignee: 日産自動車株式会社
Priority date: 2014-04-24
Filing date: 2014-04-24
Publication date: 2015-10-29
Also published as: JPWO2015162746A1; JP6451740B2

Abstract

Provided is a holding device (2) that rotatably holds a rolled sheet-material (R1) in which a sheet material (S) is wound in a roll shape and which has in the axial direction a hollow section (R3) including a central axis (CL1), wherein the holding device comprises: a holding shaft (22) which is rotatably supported with respect to a base plate (21), has a diameter (D2) smaller than the diameter (D1) of the hollow section, and is inserted into the hollow section; a fixed chuck part (24) which is disposed so as to be positionally fixed to a lateral surface (230) of the holding shaft; at least two movable chuck parts (25) that are disposed on lateral surfaces of the holding shaft other than the lateral surface on which the fixed chuck part is disposed and that are disposed so as to be able to move forward and backward in the radial direction of the holding shaft; and a driving unit (26) which causes the at least two movable chucks parts to move forward and backward.

Description

Rolled sheet material holding device and battery laminate manufacturing method

The present invention relates to a holding device for a sheet material wound in a roll shape (hereinafter also referred to as a roll-shaped sheet material) and a method for manufacturing a battery laminate.

The separator sheet raw material constituting the battery stack is loaded into the battery stack manufacturing process in a roll-shaped package, and laminated while being pulled out while being held rotatably. To be served. A lathe chuck for gripping and positioning and fixing an object to be cut is related to this type of roll sheet material holding device. For example, at least two of a plurality of claw chucks arranged at equal angles in the circumferential direction of the chuck body and capable of simultaneously moving back and forth in the radial direction by operating the drive handle and at least two claw chucks adjacent in the circumferential direction An adjustment pin that is provided between the claw chucks and that can be individually advanced and retracted in the radial direction and that can adjust the eccentric position of the workpiece by contacting the workpieces held by the claw chucks; A lathe chuck provided is known (Patent Document 1).

JP 2011-110671 A

By the way, in the manufacturing process of handling a thin film, such as a separator constituting a battery laminate of a lithium ion secondary battery, wrinkles are likely to occur in a sheet material drawn out from a roll-shaped package, and this can be suppressed. Although it is required, since the conventional holding structure is a structure for holding a workpiece inside the chuck body, it can be used for a roll sheet material holding device used in the manufacturing process of a battery laminate. Can not.

The problem to be solved by the present invention is to provide a holding device and a method for manufacturing a battery laminate that can suppress wrinkles when a roll-shaped sheet material is pulled out.

According to the present invention, one fixed chuck portion and at least two movable chuck portions that move forward and backward in the radial direction of the holding shaft are provided on the side surface of the holding shaft having an outer diameter smaller than the inner diameter of the hollow portion of the roll-shaped sheet material. By providing, the said subject is solved.

According to the present invention, when the roll-shaped sheet material is mounted on the holding shaft, the at least two movable chuck portions are set to the retracted position, and the fixed chuck portion is set to the upper surface position in the vertical direction of the holding shaft. After the hollow portion of the roll-shaped sheet material is inserted and placed on the holding shaft, the at least two movable chuck portions are moved to the advance position to press the hollow portion, and the roll-shaped sheet material is fixed to the holding shaft. That is, by inserting and placing the hollow portion of the roll-shaped sheet material on the holding shaft in the state where the movable chuck portion is in the retracted position, the holding shaft and the central axis of the roll-shaped sheet material are caused by the weight of the roll-shaped sheet material. In this state, the movable chuck is moved to the forward position and fixed, so the holding shaft and the central axis of the roll-shaped sheet material are parallel even when they are eccentric. In addition, the sheet material is not bent and the generation of wrinkles can be suppressed.

It is sectional drawing which shows one Embodiment of the battery laminated body of this invention. It is process drawing which shows the principal part of the manufacturing process of the battery laminated body of FIG. It is process drawing which shows the separator preparation process of FIG. 2A. It is a perspective view which shows one Embodiment of the holding apparatus of the roll-shaped sheet material of this invention applied to the separator preparation process of FIG. It is a side view (IV view of FIG. 3) which shows the holding | maintenance apparatus of the roll-shaped sheet material of FIG. It is sectional drawing which shows the holding shaft of the holding | maintenance apparatus of FIG.3 and FIG.4. FIG. 5B is an enlarged sectional view taken along line VB-VB in FIG. 5A. It is sectional drawing which shows the procedure which mounts | wears a roll-shaped sheet material with the holding | maintenance apparatus which concerns on the comparative example of this invention. It is a top view for demonstrating the problem at the time of unwinding a sheet material from the roll-shaped sheet material with which the holding | maintenance apparatus which concerns on the comparative example of FIG. 6A was mounted | worn. It is sectional drawing which shows the procedure which mounts | wears with a roll-shaped sheet material with the holding | maintenance apparatus which concerns on embodiment of this invention. It is a top view for demonstrating the state at the time of unwinding a sheet material from the roll-shaped sheet material with which the holding | maintenance apparatus of FIG. 7A was mounted | worn. FIG. 6 is a cross-sectional view (corresponding to the line VB-VB in FIG. 5A) showing a holding shaft of a holding device according to another embodiment of the present invention. FIG. 6 is a cross-sectional view (corresponding to the line VB-VB in FIG. 5A) showing a holding shaft of a holding device according to still another embodiment of the present invention. FIG. 6 is a cross-sectional view (corresponding to the line VB-VB in FIG. 5A) showing a holding shaft of a holding device according to still another embodiment of the present invention.

The roll sheet material holding device and battery laminate manufacturing method of the present invention can be applied to, for example, a power generation element (battery element) of a lithium ion secondary battery, that is, a battery stack manufacturing process. The present invention will be described by way of example. However, the following embodiment is an example for facilitating understanding of the present invention, and is not intended to be limited to this example.

The battery stack 1 of this example is a battery element of a lithium ion thin secondary battery, and has a separator 13 interposed between a positive electrode sheet 11 and a negative electrode sheet 12 as shown in FIG. One unit is used, and one or more of these are stacked. Note that the number of stacked positive electrode sheets 11, negative electrode sheets 12, and separators 13 can be selected as necessary, such as the capacity and output power of the secondary battery.

The positive electrode sheet 11 is made of a positive electrode active material such as a metal oxide, a conductive material such as carbon black, and an adhesive such as an aqueous dispersion of polytetrafluoroethylene in a weight ratio of, for example, 100: 3: 10. The positive electrode active material 111 mixed in (1) is applied to both surfaces of a metal foil such as an aluminum foil as the positive electrode current collector 112, dried, rolled, and then cut into a predetermined size. In addition, the mixing ratio of said aqueous dispersion of polytetrafluoroethylene is the solid content. Examples of the positive electrode active material include lithium composite oxides such as lithium nickelate (LiNiO2), lithium manganate (LiMnO2), and lithium cobaltate (LiCoO2), and chalcogen (S, Se, Te) compounds.

The negative electrode sheet 12 is a precursor of an organic fired body to a negative electrode active material that occludes and releases lithium ions of the positive electrode active material, such as amorphous carbon, non-graphitizable carbon, graphitizable carbon, or graphite. For example, an aqueous dispersion of styrene butadiene rubber resin powder as a material is mixed at a solid content ratio of, for example, 100: 5, dried, and then pulverized to carry carbonized styrene butadiene rubber on the surface of carbon particles. Then, a binder such as an acrylic resin emulsion is mixed at a weight ratio of, for example, 100: 5 to form the negative electrode active material 121. Then, the negative electrode active material 121 is applied to both surfaces of a metal foil such as a nickel foil or a copper foil as the negative electrode current collector 122, dried, rolled, and then cut into a predetermined size. In particular, when amorphous carbon or non-graphitizable carbon is used as the negative electrode active material, the flatness of the potential during charge / discharge is poor and the output voltage decreases with the amount of discharge. However, when used as a power source for an electric vehicle or the like, it is advantageous because there is no sudden drop in output.

The separator 13 has an electrical insulation property that prevents an electrical short circuit between the positive electrode sheet 11 and the negative electrode sheet 12 described above, and may have a function of holding an electrolytic solution. The separator 13 is a microporous film made of polyolefin such as polyethylene (PE) or polypropylene (PP), for example, and when an overcurrent flows, the pores of the film are blocked by the heat generation, thereby blocking the current. It also has. The separator 13 is not limited to a single-layer film such as polyolefin, but a three-layer structure in which a polypropylene layer is sandwiched between polyethylene layers, or a laminate of a polyolefin microporous film and an organic nonwoven fabric can also be used. By forming the separator 13 in multiple layers, various functions such as an overcurrent prevention function, an electrolyte holding function, and a separator shape maintenance (stiffness improvement) function can be provided.

Also, an adhesive layer 14 is formed between the separator 13 and the laminated surface of the positive electrode current collector 112 and between the separator 13 and the laminated surface of the negative electrode current collector 122 by applying an adhesive described later. Is done. The adhesive layer 14 is formed on the surface of the positive electrode current collector 112 at a portion where the positive electrode active material 111 is not formed, and is formed along the side surface of the positive electrode current collector 112. Similarly, on the negative electrode side, the adhesive layer 14 is formed on the surface of the negative electrode current collector 122 in a portion where the negative electrode active material 121 is not formed, and is formed along the side surface of the negative electrode current collector 122. . The material of the adhesive layer 14 is, for example, an epoxy-based or polyurethane-based adhesive, and preferably an epoxy-based resin having a hardness of 50 or higher (Type-D).

The above is the configuration of the battery stack 1 of this example. Although the illustration is omitted in assembling the thin secondary battery, the positive electrode current collector 112 of the positive electrode sheet 11 and the negative electrode current collector 122 of the negative electrode sheet 12 are omitted. One end of each is extended and collected, and a positive electrode tab (positive electrode terminal) and a negative electrode tab (negative electrode terminal) are connected. And this battery laminated body 1 is accommodated in a battery exterior member, and an organic liquid solvent is lithium perchlorate (LiClO ₄ ), lithium borofluoride (LiBF ₄ ), lithium hexafluorophosphate (LiPF ₆ ), hexafluoride. A thin secondary battery is completed by injecting an electrolytic solution in which a lithium salt such as lithium arsenic (LiAsF ₆ ) is dissolved as a solute and then sealing the battery exterior member.

Next, a method for manufacturing the battery stack 1 of this example will be described with reference to FIG. 2A. FIG. 2A shows a manufacturing process until the positive electrode sheet 11, the negative electrode sheet 12, and the separator 13 are respectively produced and laminated, and illustration is omitted, but as a subsequent process, a curing process of the adhesive layer 14 and There are a cutting step of the stacked battery stack 1 and a step of injecting an electrolyte into the cut battery stack 1.

2A, the positive electrode active material 111 is applied to both surfaces of the positive electrode current collector 112 and dried by the dryer M1. In the next adhesive application step, the adhesive constituting the adhesive layer 14 is applied to the laminated surface of the positive electrode sheet 11 using the rotary screen printing machine M2. As described later, since the surface including the adhesive becomes a cut surface, the adhesive is printed in a positioned state using, for example, a mask or the like according to the size of the laminated battery to be manufactured. In this example, since it is a process of making four cell surfaces from one surface, the adhesive is printed on the cross line with respect to the side surface portion excluding the surface including the electrode tab and the center of the laminated surface of the positive electrode sheet 11. To do. The same applies to the negative electrode sheet 12. In the sheet cutting step, the sheet is cut from a roll to a sheet using a rotary cutter M3, for example, in units of four sheets.

Similarly, in the negative electrode preparation process, the negative electrode active material 121 is applied to both surfaces of the negative electrode current collector 122, and the negative electrode sheet 12 is dried by the dryer M1. In the next adhesive application step, the adhesive constituting the adhesive layer 14 is applied to the laminated surface of the negative electrode sheet 12 using the rotary screen printer M2. In the sheet cutting step, the sheet is cut from a roll to a sheet using a rotary cutter (not shown), for example, in units of four sheets.

In the separator manufacturing step, the separator wound in a roll shape is pulled out, and is cut from a roll to a sheet using a rotary cutter (not shown), for example, in units of four faces.

In this example, the adhesive is applied to the laminated surface of the positive electrode sheet 11 and the negative electrode sheet 12, but may be applied to the laminated surface of the separator 13. For the adhesive, for example, a thermoplastic hot melt material is used. In this example, a compression seal or a gasket may be used instead of the adhesive.

In the next lamination process, the positive electrode production line, the negative electrode production line, and the separator production line merge, and the positive electrode sheet 11, the negative electrode sheet 12, and the separator 13 cut in the cutting process are put into the lamination stacker M4 and laminated. . At this time, the respective constituent members may be roughly laminated, for example, with a lamination accuracy of about ± 0.1 to 1.0 mm. By this lamination step, the laminated body including the laminated positive electrode sheet 11, negative electrode sheet 12, and separator layer 30 becomes the battery laminated body 1 of this example.

In addition, although illustration is abbreviate | omitted about this post process, the battery laminated body 1 is thrown into a continuous furnace in a hardening process, is pressed, and is thermoset. As a result, the adhesive becomes the adhesive layer 14 and bonds between the positive electrode sheet 11 and the separator 13 and between the negative electrode sheet 12 and the separator 13. And the battery laminated body 1 is hold | maintained by a clamp at the subsequent cutting process, and is cut | disconnected by the diamond cutter etc. in the lamination direction of the

electrode sheets

11 and 12 and the separator 13. FIG. At this time, the battery stack 1 is cut with the surface including the adhesive layer 14 as a cut surface, and the positive electrode sheet 11, the negative electrode sheet 12, and the separator 13 are cut along the cut surface. Thereby, the battery stack 1 is divided into four battery stacks. And after joining an electrode tab to each of the positive electrode current collector 112 and the negative electrode current collector 122, the electrolytic solution is injected by immersing it in the electrolytic solution tank while suspending and transporting the cut battery laminate. . Finally, a thin battery of this example is completed by laminating a battery exterior member (not shown).

In the separator manufacturing process of FIG. 2A described above, the separator sheet raw material R1 made of a polyolefin resin film or the like is a sheet having a predetermined width (a length corresponding to the width of two unit cells in the above example). Using the rotary cutter, the separator sheet raw material R1 is pulled out (or sent out) in a state where the roll-shaped separator sheet raw material R1 is rotatably held while being wound around the hollow core material R2. Cut to a predetermined length. FIG. 2B is a process diagram showing this separator manufacturing process, and the sheet material S drawn from the roll separator sheet raw material R1 is guided to the cutting process by a plurality of guide rollers GR. The holding device 2 of the present example described below holds the roll separator sheet raw material R1 in a rotatable manner in the separator manufacturing process.

FIG. 3 is a perspective view showing an embodiment of the roll sheet material holding device 2 according to the present invention, in which the sheet material S is wound in a roll shape, and the hollow portion R3 is formed in the axial direction including the central axis CL1. A holding device 2 that rotatably holds the roll-shaped sheet material R1 that has the outer diameter D2 that is rotatably supported by the base 21 and that is smaller than the inner diameter D1 of the hollow portion R3. The holding shaft 22 to be inserted (the rotation center axis of the holding shaft 22 is CL2), the fixed chuck portion 24 provided to fix the position on the side surface 230 of the holding shaft 22, and the fixed chuck portion 24 of the holding shaft 22 are provided. At least two

movable chuck portions

25, 25 provided so as to be movable forward and backward in the radial direction of the holding shaft 22, and at least two

movable chuck portions

25, 25 are moved forward on the side surfaces 230 other than the side surfaces 230. as well as It includes a drive unit 26 for retirement move, the.

FIG. 4 is a side view (IV view of FIG. 3) showing the roll-shaped sheet material holding device 2 of FIG. 3, and the base 21 includes a first base 211 placed on the floor surface or the like in the separator manufacturing process. The second base 212 is provided with the holding shaft 22 and the drive unit 26. The second base 212 includes the second base 212 standing from the first base 211.

5A is a cross-sectional view showing the holding shaft 22 of the holding device 2 of FIGS. 3 and 4, and FIG. 5B is a schematic cross-sectional view taken along the line VB-VB of FIG. 5A. As shown in FIG. 5A, the holding shaft 22 is fixed to the upper portion of the second base 212. The holding shaft 22 of this example is connected to the outer cylinder portion 221 fixed to the second base 212 and the bearing 223. A holding shaft main body 224 is fixed to the right end of the inner cylindrical portion 222. The inner cylindrical portion 222 is rotatably provided with respect to the outer cylindrical portion 221. A gear 225 is fixed to the left end of the inner cylinder part 222 and connected to a drive source such as a motor (not shown), whereby the inner cylinder part 222 and the holding shaft main body 224 rotate at a predetermined rotational speed. The inner cylindrical portion 222 and the holding shaft main body 224 are fixed by

flange joints

226 and 226, and the flange joint 226 also determines a position when the roll sheet material R1 is mounted.

A through-hole 227 is continuously formed at the center of the inner cylindrical portion 222 and the center of the holding shaft main body 224, and a pin 229 is inserted through the bearing 228. Since the left end of the pin 229 is connected to the drive unit 26 described later and is non-rotating, the inner cylindrical portion 222 rotates but the pin 229 does not rotate, and is indicated by a two-dot chain line from the position indicated by the solid line in FIG. 5A. Move to the right. As a result, the movable chuck portion 25 moves forward and backward in the radial direction of the holding shaft 22.

That is, openings 231 are formed at two locations on the side surface 230 of the holding shaft main body 224, and one end of the link member 251 is pivotally supported around the rotation shaft 252 and the other end is a pin 229. A roller 253 that slides with a conical tapered surface 232 formed at the tip of the roller is rotatably provided. Further, the rotating shaft 252 of the link member 251 is provided with a coil spring or the like (not shown) that is elastically biased in the right rotation direction shown by the solid line in FIG. 5A, and the pin 229 has two positions along the solid line shown in the figure. When moving the position of the chain line, the tapered surface 232 and the roller 253 are always in contact with each other. A chuck piece 254 is pivotally supported at the center of the link member 251 so as to be rotatable about a rotation shaft 255 at the center.

As a result, when the pin 229 shown in FIG. 5A moves from the position of the solid line to the position of the two-dot chain line, the roller 253 slides along the tapered surface 232 formed at the tip of the pin 229, thereby causing the link member 251 to move. It rotates counterclockwise around the rotation shaft 252. Along with this, the chuck piece 254 advances (projects) from the opening 231. At this time, the right end of the chuck piece 254 first comes into contact with the inner surface of the hollow portion R3 of the core member R2, but rotates clockwise around the rotation shaft 255, and finally the front surface of the chuck piece 254 is hollow. It will contact | abut to the inner surface of part R3. If the inner diameter D1 of the core material R2 and the outer diameter D2 of the holding shaft main body 224 are set, the advance dimension of the chuck piece 254 is set to a value larger than D1-D2 by a predetermined dimension, and thereby the inner surface of the hollow portion R3 of the core material R2 Will be held.

5A is driven by an actuator 261 and a link mechanism 262 configured by an air cylinder or the like shown in FIG. That is, the actuator 261 is fixed to the second base 212, and one end of a link mechanism 262 that rotates about the rotary shaft 264 is coupled to a rod 263 that moves forward and backward through the second base. The other end of 262 is connected to the base end of the pin 229. As a result, when the actuator 261 is actuated to advance the rod 263, the pin 229 moves to the right via the link mechanism 262 as shown by a two-dot chain line in FIG. 4, and when the rod 263 moves backward, the solid line in FIG. As shown by, the pin 229 moves to the left via the link mechanism 262. The movement distance of the rod 263 by the actuator 261 corresponds to the movement distance of the pin 229 indicated by the solid line and the two-dot chain line in FIG. 5A described above.

In this example, as shown in FIG. 5B, the movable chuck portion 25 described above is provided at two locations in the circumferential direction of the holding shaft main body 224. On the other hand, the fixed chuck portion 24 is provided at one place, and the one fixed chuck portion 24 and the two

movable chuck portions

25, 25 are positioned at an equal angle in the circumferential direction of the holding shaft body 224, that is, adjacent to each other. Are provided at a position where the mutual angle is 120 °. The fixed chuck portion 24 of this example is provided to be fixed to the side surface 230 of the holding shaft main body 224, and from the side surface 230, the inner diameter D1 of the hollow portion R3 of the core member R2 and the outer diameter D2 of the holding shaft main body 224. The height in the axial direction is not particularly limited, but is equal to or longer than the axial length of the chuck piece 254 of the movable chuck portion 25. . The surface of the fixed chuck portion 24 is a surface parallel to the central axis CL <b> 2 of the holding shaft 22.

Next, the operation will be described. Initially, with reference to FIG. 6A and FIG. 6B, the problem at the time of mounting roll-shaped sheet material R1 on the holding shaft 22 using the holding | maintenance apparatus 2 which concerns on the comparative example of this invention is demonstrated. The holding device 2 according to the comparative example shown in FIG. 6A has three movable chuck portions 25 provided at equal angles on the holding shaft main body 224 of the holding shaft 22, and the holding device 2 of this example shown in FIG. On the other hand, there is no fixed chuck portion 24, and instead a movable chuck portion 25 is used. In addition, the dotted line in FIG. 6A has shown the inner surface of hollow part R3 of core material R2.

When the roll-shaped sheet material R1 is mounted on the holding shaft main body 224, the hollow portion R3 of the core material R2 is held in the holding shaft with the chuck pieces 254 of the three movable chuck portions 25 retracted as shown in the upper diagram of FIG. 6A. It is inserted into the main body 224 and placed on the holding shaft main body 224. From this state, as shown in the lower drawing of the figure, the chuck pieces 254 of the three movable chuck portions 25 are advanced to press the inner surface of the hollow portion R3 of the core material R2 with the chuck pieces 254, and thereby the roll sheet material R1. Is held by the holding shaft 22, but when the state of the upper drawing of the drawing is changed to the state of the lower drawing, the chuck piece 254 of the movable chuck portion 25 located on the upper surface of the holding shaft main body 224 has the roll-shaped sheet material R 1. Weight acts. Therefore, if the chuck piece 254 does not advance by the same dimension along the axial direction of the holding shaft 22, the central axis CL2 of the holding shaft 22 and the central axis CL1 of the roll sheet material R1 are parallel as shown in the plan view of FIG. 6B. Otherwise, twisting may occur. Then, when the sheet material S is unwound in a state where twisting occurs, as shown in FIG. 6B, the left and right sides of the sheet material S between the guide roller GR (particularly, the guide roller GR that applies tension) and the roll-shaped sheet material R1. A tension imbalance occurs at the end, which leads to wrinkles.

On the other hand, according to the holding device 2 of this example, when the roll-shaped sheet material R1 is mounted on the holding shaft main body 224, the fixed chuck portion 24 is set to the upper surface position in the vertical direction as shown in the upper view of FIG. 7A. The hollow portion R3 of the core material R2 is inserted into the holding shaft main body 224 with the chuck pieces 254 of the two movable chuck portions 25 retracted, and placed on the fixed chuck portion 24 of the holding shaft main body 224. . As described above, since the surface of the fixed chuck portion 24 is a surface parallel to the central axis CL2 of the holding shaft 22, when it is placed on the holding shaft main body 224 by its own weight, the roll-shaped sheet material R1. Is placed along the upper surface of the fixed chuck portion 24. Thereby, the central axis CL1 of the roll-shaped sheet material R1 becomes parallel to the central axis CL2 of the holding shaft 22. In addition, the upper surface of the fixed chuck portion 24 of the present example protrudes from the side surface 230 of the holding shaft main body 224 by a difference D1-D2 between the inner diameter D1 of the hollow portion R3 of the core member R2 and the outer diameter D2 of the holding shaft main body 224. 7A, the center axis CL1 of the roll-shaped sheet material R1 not only becomes parallel to the center axis CL2 of the holding shaft 22, but also coincides without being eccentric.

7A, the inner surface of the hollow portion R3 of the core member R2 is pressed by the chuck piece 254 by moving the chuck pieces 254 of the two movable chuck portions 25 forward as shown in the lower figure of FIG. 7A. Thereby, the roll-shaped sheet material R <b> 1 is held on the holding shaft 22. As a result, when the sheet material S is unwound, as shown in FIG. 7B, tension is applied at the left and right ends of the sheet material S between the guide roller GR (particularly, the guide roller GR to which tension is applied) and the roll-shaped sheet material R1. Equilibrium and suppression of wrinkles can be suppressed.

In the above-described embodiment, the upper surface of the fixed chuck portion 24 protrudes from the side surface 230 of the holding shaft main body 224 by the difference D1-D2 between the inner diameter D1 of the hollow portion R3 of the core member R2 and the outer diameter D2 of the holding shaft main body 224. Although the height is set, a portion flush with the side surface 230 of the holding shaft main body 224 may be used as the fixed chuck portion 24. FIG. 8A is a cross-sectional view showing this example (a cross-sectional view corresponding to FIG. 5B). When the roll-shaped sheet material R1 is mounted on the holding shaft main body 224, the fixed chuck portion 24 is rotated to the upper surface position in the vertical direction. At the same time, with the chuck pieces 254 of the two movable chuck portions 25 retracted, the hollow portion R3 of the core material R2 is inserted into the holding shaft main body 224 and placed on the fixed chuck portion 24 of the holding shaft main body 224. In the example shown in the figure, the fixed chuck portion 24 is configured by a part of the side surface 230 of the holding shaft main body 224, so that it is not necessary to bury another member, and it may be configured by a part of the holding shaft main body 224. However, when the roll-shaped sheet material R1 is mounted, the portion of the fixed chuck portion 24 is rotated to the upper surface in the vertical direction of the holding shaft main body 224 so that the two

movable chuck portions

25 and 25 are equiangularly arranged on the lower side in the vertical direction. Since it needs to be positioned, it is preferable to provide a mark such as a mark on the fixed chuck portion 24.

8A, the hollow portion R3 of the core material R2 is inserted into the holding shaft main body 224 with the chuck pieces 254 of the two movable chuck portions 25 retracted, and the fixed chuck portion 24 of the holding shaft main body 224 is inserted. , The central axis CL1 of the roll-shaped sheet material R1 becomes parallel to the central axis CL2 of the holding shaft 22. Then, the chuck pieces 254 of the two movable chuck portions 25 are advanced from this state to press the inner surface of the hollow portion R3 of the core material R2 with the chuck pieces 254, thereby holding the roll sheet material R1 on the holding shaft 22. To do. As a result, the central axis CL1 of the roll-shaped sheet material R1 is parallel to the eccentric center axis CL2 of the holding shaft 22, so that when the sheet material S is unwound, the guide roller GR (especially a guide for applying tension). The tension is balanced at the left and right ends of the sheet material S between the roller GR) and the roll-shaped sheet material R1, and the generation of wrinkles can be suppressed.

Further, in the above-described embodiment, one fixed chuck portion 24 and two movable chuck portions 25 are provided for one holding shaft main body 224. However, one fixed chuck portion 24 and three movable chuck portions 25 are provided. Also good. 8B shows another example in which three movable chuck portions 25 are provided in the embodiment of FIG. 5B, and one fixed chuck portion 24 and three movable chuck portions 25 are arranged at an equal angle in the circumferential direction of the holding shaft main body 224. Indicates. 8C has three movable chuck portions 25 with respect to the embodiment of FIG. 8A, and one fixed chuck portion 24 and three movable chuck portions 25 are arranged at equal angles in the circumferential direction of the holding shaft main body 224. Another example is shown.

In any example, when the roll-shaped sheet material R1 is mounted on the holding shaft main body 224, the fixed chuck portion 24 is rotated to the upper surface position in the vertical direction and the chuck pieces 254 of the three movable chuck portions 25 are retracted. In this state, the hollow portion R3 of the core material R2 is inserted into the holding shaft main body 224 and placed on the fixed chuck portion 24 of the holding shaft main body 224, whereby the central axis CL1 of the roll-shaped sheet material R1 is the center of the holding shaft 22. It becomes parallel to the axis CL2. As a result, when the sheet material S is unwound, the tension is balanced at the left and right ends of the sheet material S between the guide roller GR (particularly the guide roller GR to which tension is applied) and the roll-shaped sheet material R1. Can be suppressed.

The tapered surface 232 corresponds to the first cam surface according to the present invention, and the roller 253 corresponds to the second cam surface according to the present invention.

DESCRIPTION OF SYMBOLS 1 ... Battery laminated body 11 ... Positive electrode sheet 111 ... Positive electrode active material 112 ... Positive electrode collector 12 ... Negative electrode sheet 121 ... Negative electrode active material 122 ... Negative electrode collector 13 ... Separator 14 ... Adhesive layer M1 ... Dryer M2 ... Rotary Screen printing machine M3 ... Rotary cutter M4 ... Stacking stacker R1 ... Roll separator sheet raw material R2 ... Core material R3 ... Hollow portion D1 ... Hollow portion inner diameter CL1 ... Central axis S of roll separator raw material ... Sheet material GR ... Guide Roller 2 ... Holding device 21 ... Base 211 ... First base 212 ... Second base 22 ... Holding shaft 221 ... Outer cylindrical portion 222 ... Inner cylindrical portion 223 ... Bearing 224 ... Holding shaft main body 225 ... Gear 226 ... Flange joint 227 ... Through Hole 228 ... Bearing 229 ... Pin 230 ... Side surface of holding shaft 231 ... Opening 232 ... Tapered surface (first cam surface)
D2 ... Outer diameter of holding shaft CL2 ... Center axis of holding shaft 24 ... Fixed chuck portion 25 ... Movable chuck portion 251 ... Link member 252 ... Rotating shaft 253 ... Roller (second cam surface)
254: Chuck piece 255 ... Rotating shaft 26 ... Drive unit 261 ... Actuator 262 ... Link mechanism 263 ... Rod 264 ... Rotating shaft

Claims

In the holding device in which the sheet material is wound in a roll shape and rotatably holds the roll sheet material having a hollow portion in the axial direction including the central axis,
A holding shaft that is rotatably supported with respect to the base, has an outer diameter smaller than the inner diameter of the hollow portion, and is inserted into the hollow portion;
A fixed chuck portion provided at a fixed position on a side surface of the holding shaft;
At least two movable chuck portions provided on the side surface of the holding shaft other than the side surface on which the fixed chuck portion is provided so as to be capable of moving forward and backward in the radial direction of the holding shaft;
A roll-shaped sheet material holding device comprising: a drive unit that moves the at least two movable chuck units forward and backward.
The roll-shaped sheet material holding device according to claim 1, wherein the fixed chuck portion and the at least two movable chuck portions are provided at an equal angle in a circumferential direction of the holding shaft.
The roll sheet material holding device according to claim 2, wherein the fixed chuck portion and the two movable chuck portions are provided at an equal angle in a circumferential direction of the holding shaft.
The roll-shaped sheet material holding device according to any one of claims 1 to 3, wherein the fixed chuck portion is provided so as to protrude in a radial direction from a side surface of the holding shaft.
The roll-shaped sheet according to claim 4, wherein the upper surface of the fixed chuck portion is provided to project radially from the side surface of the holding shaft by a difference between the inner diameter of the hollow portion and the outer diameter of the holding shaft. Material holding device.
The roll sheet material holding device according to any one of claims 1 to 3, wherein the fixed chuck portion is a part of a side surface of the holding shaft.
The drive unit is
A pin provided in the holding shaft so as to be movable in the axial direction and having a first cam surface;
An actuator for moving the pin forward and backward in the axial direction;
A link member that is rotatably attached to the holding shaft and that rotatably supports the movable chuck portion and has a second cam surface that engages with the first cam surface;
The first cam surface and the second cam surface are engaged with each other as the pin moves forward and backward, the link member rotates, and the movable chuck portion moves forward and backward. The holding | maintenance apparatus of the roll-shaped sheet material as described in any one of these.
When mounting the roll-shaped sheet material on the holding shaft,
While the at least two movable chuck portions are in the retracted position and the fixed chuck portion is in the upper surface position in the vertical direction of the holding shaft, the hollow portion of the roll-shaped sheet material is inserted into the holding shaft. After placing
The roll-shaped sheet material according to any one of claims 1 to 7, wherein the roll-shaped sheet material is fixed to the holding shaft by moving the at least two movable chuck portions to an advance position to press the hollow portion. Holding device.
The separator raw material constituting the battery stack of the secondary battery is wound in a roll shape, and the roll separator raw material having a hollow portion in the axial direction including the central axis is made to have an outer diameter smaller than the inner diameter of the hollow portion. A first step of rotatably holding the holding shaft and sequentially pulling it out;
In the method for producing a battery laminate having a second step of laminating a positive electrode sheet and a negative electrode sheet on each of both surfaces of the drawn separator,
The first step includes
When holding the roll separator raw material rotatably on the holding shaft,
After inserting and placing the hollow part of the roll separator raw material on the holding shaft,
Of the gap formed between the outer surface of the holding shaft and the inner surface of the hollow portion, at least two portions of the hollow portion vertically below from the center are pressed, and the roll separator raw material is applied to the holding shaft. The manufacturing method of a battery laminated body including the process to fix.