Device for manufacturing a laminate and method for manufacturing a laminate

Abstract

To provide a device for manufacturing a laminate which further suppresses occurrence of short-circuiting.SOLUTION: A laminate manufacturing device comprises a first punching part and a second punching part which is disposed oppositely with the first punching part. The first punching part includes a first die and a first punch which is opposed to the first die and configured to be inserted / ejected to / from a first penetration hole. The first punch punches a first sheet together with the first die and penetrates the first penetration hole while holding the punched first sheet on a distal end face. The second punching part includes a second die and a second punch which is opposed to the second die and configured to be inserted / ejected to / from a second penetration hole. The second punch punches a second sheet together with the second die and penetrates the second penetration hole while holding the punched second sheet on a distal end face, and the first and second punches laminate and hold the punched first and second sheets.SELECTED DRAWING: Figure 2A

Description

Technical Field

[0001] The present disclosure relates to an apparatus for manufacturing a laminate and a method for manufacturing a laminate, and particularly to an apparatus for manufacturing an all-solid-state battery and a method for manufacturing an all-solid-state battery.

Background Art

[0002] In the manufacture of a laminate composed of a plurality of sheets, in order to satisfy the performance required for the laminate, each sheet is processed into a desired shape and size and laminated. For example, when the laminate is a secondary battery, the secondary battery includes a positive electrode, a negative electrode, and a separator disposed between the positive electrode and the negative electrode. The separator has a function of electrically insulating the positive electrode and the negative electrode and allowing ions to pass through.

[0003] In a secondary battery, when the positive electrode sheet, the negative electrode sheet, and the separator sheet are laminated with a deviation from the design, dendrites may be generated when charge and discharge are repeated, resulting in an electrical short circuit. For the purpose of reducing such misalignment, for example, in Patent Document 1, a method of preparing a laminate including a positive electrode, a separator, and a negative electrode in advance and punching out the laminate all at once is disclosed.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] By the way, in the laminate as described above, as a result of the inventors' intensive studies, it was found that short circuits cannot be sufficiently suppressed. Specifically, in Patent Document 1, burrs are generated in the vicinity of the cut surface of the punched laminate, so that the distance between the positive electrode sheet and the negative electrode sheet becomes locally small, and as a result, it was found that short circuits are likely to occur. Also, on the cut surface of the laminate, a material flow is generated by a cutting tool or the like, and as a result, it was also found that short circuits are likely to occur due to the active material and the conductive assistant adhering to the cut surface.

[0006] This disclosure has been made in view of such problems. That is, the main object of this disclosure is to provide an apparatus (apparatus for manufacturing a laminate) for manufacturing a laminate that further suppresses the occurrence of short circuits and a method (method for manufacturing a laminate) for manufacturing such a laminate.

Means for Solving the Problems

[0007] The laminate manufacturing apparatus according to an embodiment of the present disclosure is an apparatus for manufacturing a laminate in which a first sheet and a second sheet are laminated, comprising a first punching part that punches the first sheet, and a second punching part that is disposed opposite to the first punching part and punches the second sheet, the first punching part having a first die provided with a first through hole and a first punch configured to be insertable into and removable from the first through hole and facing the first die, the first punch punching the first sheet conveyed between its tip surface and the first through hole together with the first die, and inserting the punched first sheet through the first through hole while holding it on the tip surface, the second punching part being integratable with the first die and having a second die provided with a second through hole and a second punch configured to be insertable into and removable from the second through hole and facing the second die, the second punch punching the second sheet conveyed between its tip surface and the second through hole together with the second die, and inserting the punched second sheet through the second through hole while holding it on the tip surface, The first punch and the second punch laminate and sandwich the punched first sheet and the punched second sheet.

[0008] A method for manufacturing a laminate according to an embodiment of the present disclosure is a method for manufacturing a laminate in which a first sheet and a second sheet are laminated, a first sheet punching step of punching a first sheet with a first punching portion having a first die provided with a first through hole and a first punch configured to be insertable into and removable from the first through hole and facing the first die; a second sheet punching step of punching a second sheet with a second punching portion having a second die that can be integrated with the first die and is provided with a second through hole and a second punch configured to be insertable into and removable from the second through hole and facing the second die, the second punching portion being disposed opposite to the first punching portion; a laminating step of laminating the punched first sheet and the punched second sheet by inserting the first punch into the first through hole while holding the punched first sheet on the tip surface of the first punch and inserting the second punch into the second through hole while holding the punched second sheet on the tip surface of the second punch; comprising.

Advantages of the Invention

[0009] The present disclosure can provide an apparatus for manufacturing a laminate that further suppresses the occurrence of short circuits and a method for manufacturing the laminate.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2A

Figure 2B

Figure 2C

Figure 2D

Figure 3

Figure 4

Figure 5

Figure 6A

Figure 6B

Figure 6C

Figure 6D

Figure 7A

Figure 7B

Figure 7C

Figure 7D

Figure 8A

Figure 8B

Figure 8C

Figure 8D

Figure 9A

Figure 9B

Figure 9C

Figure 9D

Mode for Carrying Out the Invention

[0011] Hereinafter, an apparatus for manufacturing a laminate and a method for manufacturing a laminate, which are aspects of the present disclosure, will be described in detail with reference to the illustrated embodiments. Note that the drawings include some schematic ones and may not reflect actual dimensions and ratios.

[0012] All kinds of numerical ranges mentioned in this specification are intended to include the numerical values of the lower limit and the upper limit (i.e., the upper limit value and the lower limit value) themselves, unless special terms such as "less than", "greater than", and "smaller than" are attached. For example, taking the numerical range of 1 to 10 as an example, unless special terms are attached, it is interpreted as a numerical range including the lower limit value "1" and also including the upper limit value "10" (i.e., 1 or more and 10 or less). In addition, one numerical range (for example, 1 μm or more) selected from a plurality of numerical ranges described only by the lower limit value (for example, 1 μm or more, 10 μm or more) and one numerical range (for example, 100 μm or less) selected from a plurality of numerical ranges described only by the upper limit value (for example, 300 μm or less, 100 μm or less) may be combined (for example, 1 μm or more and 100 μm or less).

[0013] In this specification, the "laminated body" refers to a structure in which a first sheet and a second sheet are laminated. The first sheet and the second sheet may be laminated directly or indirectly via any layer. Referring to FIG. 1, an example of the laminated body is shown. FIGS. 1(a) to (c) are cross-sectional views showing an example of the laminated body. In the laminated bodies 10, 10B, and 10C, the first sheet 12 and the second sheet 14 are laminated via a third sheet 16.

[0014] The laminated bodies 10, 10B, and 10C are, for example, batteries (more specifically, solid-state batteries, particularly, all-solid-state batteries), capacitors, and thermistors. When the laminated body 10 is a solid-state battery, for example, the first sheet 12 is composed of one or more layers including a positive electrode current collector, and the second sheet 14 is composed of one or more layers including a negative electrode current collector. The first sheet 12 is, for example, composed of a layer 122 of a positive electrode current collector (more specifically, Al or the like) and a layer 124 of a positive electrode active material (more specifically, a positive electrode active material for a lithium-ion battery such as lithium ions) disposed on the layer 122 of the positive electrode current collector. The second sheet 14 is, for example, composed of a layer 142 of a negative electrode current collector (more specifically, Cu or the like) and a layer 144 of a negative electrode active material (more specifically, a negative electrode active material for a lithium-ion battery such as graphite) disposed on the layer 142 of the negative electrode current collector. The third sheet 16 is, for example, an electrolyte layer. The laminated bodies 10, 10B, and 10C may adopt a configuration in which layers containing conductive components (more specifically, electrical conductive components and thermal conductive components, etc.) are laminated via insulating layers (more specifically, electrical insulating layers and thermal insulating layers, etc.).

[0015] <First Embodiment> Figs. 2A to 2D are cross-sectional views showing an apparatus for manufacturing a laminate (hereinafter, also simply referred to as "apparatus") according to the first embodiment of the present disclosure. Figs. 2A to 2D are also cross-sectional views for explaining a method of manufacturing the laminate 10. With reference to Figs. 2A to 2D, the apparatus for manufacturing a laminate and the method of manufacturing a laminate will be described. As shown in Figs. 2A to 2D, the Z direction is the direction in which the first punching portion 20 and the second punching portion 30 face each other (the directly facing direction), and corresponds to the vertical direction. The X direction is perpendicular to the Z direction and perpendicular to the YZ plane (for example, the plane of the paper). The Y direction is perpendicular to the Z direction and the X direction, and corresponds to the lateral direction.

[0016] The apparatus 1 according to the first embodiment is an apparatus for manufacturing a laminate 10 in which a first sheet 12, a third sheet 16, and a second sheet 14 are laminated.

[0017] [Apparatus] The apparatus 1 according to the first embodiment includes a first punching portion 20 that punches the first sheet 12, and a second punching portion 30 that punches the second sheet 14 and the third sheet 16. The second punching portion 30 is disposed to face the first punching portion 20.

[0018] (First Punching Portion) The first punching portion 20 has a first die 22 provided with a first through hole 222, and a first punch 24 configured to be insertable into and removable from the first through hole 222 and facing the first die 22. The first punching portion 20 further includes a first sheet pressing portion 40, a first connecting portion 27 connected to the first sheet pressing portion 40, a first spring (not shown) provided to wind around the first connecting portion 27, and a first punch holder 26 provided with a first insertion hole 262 through which the first connecting portion 27 can be inserted and fixing the first punch 24. The first sheet pressing portion 40 is disposed to face the first die 22 and is provided with a third through hole 42.

[0019] The first punch 24 is configured to be insertable into and removable from the first through hole 222 of the first die 22 and moves up and down within the first through hole 222. The first punch 24 is configured to be insertable into and removable from the third through hole 42 of the first sheet pressing portion 40 and moves up and down within the third through hole 42.

[0020] The first punch 24 can have a first suction portion (not shown in FIGS. 2A to 2D) that sucks the first sheet 12 on its tip surface 242. The first suction portion 60 will be described with reference to FIG. 4. FIG. 4 is an enlarged cross-sectional view of the first punch 24 and shows a cross-sectional view of the first suction portion. The first suction portion 60 includes a porous body (porous body) 64 having communication holes and a decompression portion (not shown) having a first suction passage 62 communicating with the communication holes. The main surface of the porous body 64 constitutes a part of the tip surface 242. That is, the porous body 64 constitutes a part of the tip surface 242 so as to be exposed from the tip surface 242. In this way, since the main surface of the porous body 64 constitutes a part of the tip surface 242, intake through the tip surface 242 by the exposed porous body 64 becomes possible. The intake by the first suction portion 60 is performed, for example, in the lamination step of the method for manufacturing the laminate 10 described later. When the first punch 24 has the first suction portion 60, it becomes possible to move and laminate the punched first sheet 12 while further holding it on the first punch 24. Therefore, the occurrence of misalignment of the first sheet 12 is further suppressed.

[0021] More specifically, the porous body 64 has a plurality of fine communication holes having openings on its surface. The decompression portion sucks through the communication holes of the porous body 64 disposed on the tip surface 242 of the first punch 24 (that is, by making the vicinity of the openings of the communication holes of the porous body 64 a decompressed atmosphere), and holds the first sheet 12 on the tip surface 242 of the first punch 24. In this way, since the first sheet 12 is held by the fine openings, for example, even if a relatively large pressure such as 50 MPa is applied to the laminate 10 in the application step described later, indentation-like irregularities are less likely to occur on the first sheet 12. The openings of the communication holes are, for example, 1 to 150 μm. The material of the porous body 64 is preferably a material having a relatively high compressive strength, for example, stainless steel and super steel.

[0022] The first suction part 60 can further have a pressurizing part (not shown) communicating with the first suction path 62. By pressurizing through the communication holes of the porous body 64 disposed on the tip surface 242 of the first punch 24 (that is, by making the vicinity of the openings of the communication holes of the porous body 64 the pressurized atmosphere), exhaust through the tip surface 242 becomes possible. Exhaust by the first suction part (or the first suction and exhaust part) 60 is performed, for example, in the application step of the manufacturing method of the laminate 10 described later. When the first punch 24 has the first suction and exhaust part 60, even if the laminate 10 adheres to the tip surface 242, the laminate 10 can be easily taken out in the subsequent conveyance step.

[0023] (Second punching part) The second punching part 30 has a second die 32 provided with a second through hole 322 and a second punch 34 configured to be insertable into and removable from the second through hole 322 and facing the second die 32. The second punching part 30 further has a second sheet pressing part 50, a second connecting part 37 connected to the second sheet pressing part 50, a second spring (not shown) provided to wind around the second connecting part 37, and a second punch holder 36 provided with a second insertion hole 362 through which the second connecting part 37 can be inserted and fixing the second punch 34. The second sheet pressing part 50 is disposed to face the second die 32 and is provided with a fourth through hole 52.

[0024] The second punch 34 can have a second suction part (not shown in FIGS. 2A to 2D) that sucks the second sheet 14 and the third sheet 16 at its tip surface 342. Since the second suction part is substantially the same as the first suction part 60, the description thereof is omitted.

[0025] The second punch 34 is configured to be insertable into and removable from the second through hole 322 of the second die 32 and moves up and down within the second through hole 322. The second punch 34 is configured to be insertable into and removable from the fourth through hole 52 of the second sheet pressing part 50 and moves up and down within the fourth through hole 52.

[0026] In the apparatus 1 according to the first embodiment, the first punching part 20 and the second punching part 30 are arranged to face each other. After punching the first sheet 12 and the second sheet 14, a laminate is manufactured by sandwiching them between the first punching part 20 and the second punching part 30. In this way, since the first and second sheets 12 and 14 are laminated such that their punching directions face each other, even when burrs are generated near the cut surfaces of the punched first and second sheets 12 and 14, the burrs of the first and second sheets 12 and 14 are formed in opposite directions away from the bonding surfaces of the sheets 12 and 14. Therefore, a short circuit due to burrs is less likely to occur.

[0027] This will be described in detail with reference to FIG. 3. FIG. 3(a) is an enlarged cross-sectional view near the cut surface of the laminate 10 manufactured by the apparatus 1 according to the first embodiment. FIG. 3(b) is an enlarged cross-sectional view near the cut surface of the laminate 10 manufactured by a conventional apparatus. In the apparatus 1 according to the first embodiment, the first sheet 12 is punched from above downward along the Z direction by the first punching part 20 including the first punch 24 and the first die 22. Therefore, near the cut surface of the first sheet 12 in the laminate 10 manufactured by the apparatus 1 according to the first embodiment, as shown in FIG. 3(a), burrs that face upward may occur. On the other hand, the second sheet 14 and the third sheet 16 are punched from below upward along the Z direction by the second punching part 30 including the second punch 34 and the second die 32. Therefore, near the cut surfaces of the second sheet 14 and the third sheet 16 in the laminate 10 manufactured by the apparatus 1 according to the first embodiment, burrs that face downward may occur. And since the laminate 10 is configured by laminating the first sheet 12 on the second sheet 14 via the third sheet 16, the burrs are formed in opposite directions away from the bonding surfaces of the sheets (more specifically, the bonding surface between the first sheet 12 and the third sheet 16).

[0028] In such a laminate 10, since the first sheet 12 and the second sheet 14 are separated by at least the distance L corresponding to the thickness of the third sheet 16, for example, a short circuit between the first sheet 12 and the second sheet 14 is suppressed.

[0029] On the other hand, in the prior art where, for example, the first to third sheets 12, 14, and 16 are laminated and then punched out collectively, as shown in FIG. 3(b), burrs facing the same direction may occur near the cut surface of the laminate 10 to be manufactured. For this reason, in the distance between the first sheet 12 and the second sheet 14, a distance L' smaller than the distance L corresponding to the thickness of the third sheet 16 may occur. In such a case, since the electrical resistance decreases at the location of the distance L', a short circuit may occur.

[0030] Also, in the present embodiment, the first sheet 12 and the second sheet 14 are not punched out collectively in the laminated state, but the first sheet 12 and the second sheet 14 are individually punched out by the first punching portion 20 and the second punching portion 30, respectively.

[0031] Specifically, the first punch 24 and the first die 22 punch out the first sheet 12 so as not to contact the second sheet 14. In this way, since the first punch 24 and the first die 22 do not contact the second sheet 14, even if components (for example, powder materials such as active materials) constituting the first sheet 12 adhere to the first punch 24 and the first die 22 due to the punching of the first sheet 12, this component is less likely to adhere to the cut surface of the second sheet 14.

[0032] Similarly, the second punch 34 and the second die 32 punch out the second sheet 14 so as not to contact the first sheet 12. In this way, since the second punch 34 and the second die 32 do not contact the first sheet 12, even if components (for example, powder materials such as active materials) constituting the second sheet 14 adhere to the second punch 34 and the second die 32 due to the punching of the second sheet 14, this component is less likely to adhere to the cut surface of the first sheet 12.

[0033] In this way, in the present embodiment, since the first sheet 12 and the second sheet 14 are individually punched out, material flow by the punching portions 20, 30 (specifically, the punches 24, 34 and the dies 22, 32) is less likely to occur at the cut surface of the laminate 10, and as a result, the occurrence of a short circuit due to the components constituting the sheet adhering to the cut surface is suppressed.

[0034] On the other hand, in the prior art where, for example, the first to third sheets 12, 14, 16 are laminated and then punched out all at once, as shown in FIG. 3(b), the punching is performed in the order of the first sheet 12, the third sheet 16, and the second sheet 14. That is, after the punch punches out the first sheet 12, the third sheet 16 and the second sheet 14 are punched out. For this reason, with the components constituting the first sheet 12 adhering to the punch due to the punching of the first sheet 12, the third sheet 16 and the second sheet 14 are punched out. Therefore, the components constituting the first sheet 12 are likely to adhere to the cut surfaces of the formed third sheet 16 and second sheet 14. Thus, material flow due to the punch and die is likely to occur, and as a result, a short circuit is likely to occur in the above prior art. Furthermore, when the laminate is punched out all at once with a conductive punch, a short circuit may occur in the punch due to the potential difference between the first sheet 12 and the second sheet 14.

[0035] The present disclosure has been completed based on the following technical findings as a result of intensive studies by the present inventors. The present inventors intensively studied the reason why the prior art cannot sufficiently suppress a short circuit caused by burrs. For example, in the prior art where punching is performed all at once after lamination, attention was paid to the fact that burrs are formed in the same direction near the cut surface of the laminate 10. Then, as shown in FIG. 3(b), in the plurality of sheets 12, 14, 16 constituting the laminate 10, it was found that the distance between the first sheet 12 and the second sheet 14 becomes less than the thickness of the third sheet 16 due to the formation of burrs in the same direction. As a result, for example, it was derived that a short circuit is likely to occur due to a decrease in the electrical resistance at that location.

[0036] Based on the above technical findings, the inventors have intensively studied means for solving the problems. First, the inventors have obtained a conviction that it is difficult to completely suppress the generation of burrs when processing the sheets 12, 14, and 16 in the punching portions 20, 30 having the punches 24, 34 and the dies 22, 32. Therefore, on the premise that burrs are generated when adopting the punching portions 20, 30 having the punches 24, 34 and the dies 22, 32, the above means for suppressing the occurrence of short circuits have been studied. As a result, it has been found that if burrs are formed in the reverse direction away from the bonding surface of the sheets, it is possible to prevent the distance between the first sheet 12 and the second sheet 14 from locally becoming small.

[0037] On the other hand, the inventors separately studied the reason why the above prior art cannot sufficiently suppress short circuits caused by material flow. In the above prior art, attention was paid to laminating the first sheet 12 and the second sheet 14 and punching them with the same punching portion. Then, in order to punch one of the first sheet 12 and the second sheet 14 and then continuously punch the other sheet, the other sheet is punched in a state where the components constituting one sheet adhere to the punching portion. As a result, it has been found that the components constituting one sheet adhere to the cut surface of the other sheet. As a result, it has been derived that a short circuit is likely to occur due to a decrease in electrical resistance at the portion where the components adhere.

[0038] As a result of further intensive study on means for solving the problems based on the above technical findings, the inventors have found that if the first sheet 12 and the second sheet 14 are not laminated and are individually punched at different punching portions, it is possible to prevent the components constituting one sheet from adhering to the cut surface of the other sheet.

[0039] Taking these matters into comprehensive consideration, the inventors have derived the feature that the two punching portions 20, 30 having the punches 24, 34 and the dies 22, 32 face each other.

[0040] The inventors further intensively studied from the perspective of further suppressing short circuits. As a result, they focused on the fact that when a plurality of sheets 12, 14, and 16 in the laminate 10 are displaced, short circuits are likely to occur. For example, if there is no portion of the negative electrode (more specifically, graphite) at a position (opposite position) facing an arbitrary portion of the positive electrode (more specifically, lithium) due to the above-described misalignment, during charging of the secondary battery, metal ions (more specifically, lithium ions) that have moved from the positive electrode lose their way, and dendrites are likely to be formed by the dendritic growth of metal ions at the portion of the negative electrode. In this case, short circuits are likely to occur as the generation of dendrites at the negative electrode proceeds toward the positive electrode side.

[0041] Generally, when performing alignment with high precision, image processing is performed, which requires a predetermined time and reduces mass productivity. Considering these factors, the inventors found that by performing punching and lamination in a series, it is not necessary to align the punched sheets 12, 14, and 16, and a laminate 10 that accurately reflects the design can be manufactured. Based on such technical knowledge, after the punches 24 and 34 punch the sheets 12, 14, and 16, while placing the punched sheets on the tip surfaces 242 and 342, the sheets 12, 14, and 16 are laminated by inserting them through the through holes 222 and 322 of the dies 22 and 32.

[0042] The inventors also found that in the above prior art, other problems can occur in addition to the occurrence of short circuits. For example, the distance between the first sheet 12 and the second sheet 14 becomes non-uniform due to the generation of burrs, so that the material constituting the first sheet 12 is utilized non-uniformly, and as a result, the function of the laminate may deteriorate (more specifically, the electrode capacity decreases and the electrode may be damaged). In the above prior art, the laminate is punched out collectively while smoothing the end surfaces (cut surfaces) formed by punching. For this reason, the components of the sheets 12, 14, and 16 are likely to mix into other sheets 12, 14, and 16. Such foreign matter mixing is, for example, the mixing of the positive electrode active material into the layer of the negative electrode active material. As a result, the function of the laminate 10 may deteriorate.

[0043] In this embodiment, the distance between the first sheet 12 and the second sheet 14 is less likely to be uneven due to burrs, and foreign matter intrusion is less likely to occur. Therefore, in this embodiment, in addition to the effect of sufficiently suppressing the occurrence of short circuits, a secondary effect that these problems are less likely to occur can occur.

[0044] The first to third sheets 12, 14, and 16 may include a binder. Examples of such binders include polytetrafluoroethylene, polytrifluoroethylene, polyolefin, polyethylene, polypropylene, cellulose resin, acrylic resin, vinyl resin, nitrile rubber, polybutadiene rubber, butyl rubber, polystyrene, styrene-butadiene rubber, styrene-butadiene latex, polysulfide rubber, acrylonitrile-butadiene rubber, polyvinyl fluoride, polyvinylidene fluoride (PVDF), fluororubber, and polyalkylene carbonate. Polyalkylene carbonate has, for example, the formula -(-C(=O)-O-R-O-)- [wherein, R represents an alkylene group having 1 to 20 carbon atoms] and includes a repeating unit represented by. The alkylene group having 1 to 20 carbon atoms may be linear or branched, and a part thereof may be cyclic.

[0045] The thicknesses of the first to third sheets 12, 14, and 16 are each independently, for example, 1 μm or more, 10 μm or more, 30 μm or more, 50 μm or more, or 100 μm or more, and 1000 μm or less, 750 μm or less, 500 μm or less, 300 μm or less, or 100 μm or less. The thicknesses of the layer 122 of the positive electrode current collector and the layer 142 of the negative electrode current collector are each independently, for example, 1 μm or more, 5 μm or more, 10 μm or more, or 50 μm or more, and 500 μm or less, 300 μm or less, 100 μm or less, or 50 μm or less.

[0046] [Manufacturing method of laminate] Hereinafter, an example of a method for manufacturing the laminate 10 according to the first embodiment will be described. The manufacturing method of the laminate 10 is a method for manufacturing the laminate 10 in which the first sheet 12 and the second sheet 14 are laminated, and the apparatus 1 according to the first embodiment is used. The manufacturing method of the laminate 10 includes a first sheet punching step, a second sheet punching step, and a lamination step. The manufacturing method of the laminate 10 may further include an application step and a conveyance step.

[0047] (First sheet punching step) In the first sheet punching step, the first sheet 12 is punched by a first punching portion 20 having a first die 22 provided with a first through hole 222 and a first punch 24 configured to be insertable into and removable from the first through hole 222 and facing the first die 22.

[0048] As shown in FIGS. 2A and 2B, when the first punch holder 26 is pushed down, the first punch 24 descends so as to pass through the third through hole 42 of the first sheet pressing portion 40. When the first punch 24 descends in this way, the first spring contracts in the Z direction and a biasing force is generated. Due to this biasing force, the first sheet pressing portion 40 also descends to press the first sheet 12 against the first die 22. The first sheet pressing portion 40 presses the first sheet 12 to be punched. As a result, the first sheet 12 is sandwiched and fixed between the first sheet pressing portion 40 and the first die 22. In this way, when the first sheet 12 is punched in a more fixed state by the first sheet pressing portion 40, for example, it is possible to prevent the first sheet 12 from being caught during punching and to punch the first sheet 12 while appropriately reflecting the designed shape and size. Therefore, the occurrence of misalignment of the first sheet 12 is further suppressed. The first punching portion 20 punches (cuts out) the first sheet 12 toward the bonding surface where the first sheet 12 is laminated.

[0049] As shown in FIG. 2C, the first punch 24 further descends and is inserted into the third through hole 42 and the first through hole 222, so that the first punch 24 punches out the first sheet 12 having a predetermined shape from the first sheet 12 together with the first die 22. Here, the first sheet 12 is punched while being sandwiched between the first die 22 and the first sheet pressing portion 40 disposed opposite to the first die 22. In this way, the first punch 24 punches out the first sheet 12 conveyed between its tip surface 242 and the first through hole 222 together with the first die 22. In this case, the first die 22 is movable in the vertical direction and descends until its lower surface contacts the upper surface of the second die 32.

[0050] (Second Sheet Punching Step) In the second sheet punching step, the second punching portion 30 having the second die 32 provided with the second through hole 322 and the second punch 34 disposed opposite to the second die 32 and configured to be insertable into and removable from the second through hole 322 punches out the second sheet 14 and the third sheet 16.

[0051] As shown in FIGS. 2A and 2B, when the second punch holder 36 is pushed up, the second punch 34 rises so as to be inserted into the fourth through hole 52 of the second sheet pressing portion 50. When the second punch 34 rises in this way, the second spring contracts in the Z direction and a biasing force is generated. Due to this biasing force, the second sheet pressing portion 50 also rises and presses the second sheet 14 and the third sheet 16 against the second die 32. The second sheet pressing portion 50 presses the second sheet 14 and the third sheet 16 to be punched. As a result, the second sheet 14 and the third sheet 16 are sandwiched and fixed between the second sheet pressing portion 50 and the second die 32. In this way, when the second sheet 14 and the third sheet 16 are punched in a more fixed state by the second sheet pressing portion 50, for example, it is possible to prevent the second sheet 14 and the third sheet 16 from being caught during punching, and to punch the second sheet 14 and the third sheet 16 while appropriately reflecting the designed shape and size. Therefore, the occurrence of misalignment of the second sheet 14 and the third sheet 16 is further suppressed. The second punching portion 30 punches the second sheet 14 and the third sheet 16 toward the bonding surface where the third sheet 16 is laminated.

[0052] The second punching portion 30 punches the second sheet and the third sheet 16 substantially simultaneously with the punching of the first sheet 12 by the first punching portion 20. Therefore, the apparatus 1 according to the first embodiment is excellent in mass productivity.

[0053] As shown in FIG. 2C, the second punch 34 further ascends and, by further inserting into the fourth through-hole 52 and the second through-hole 322, the second punch 34 punches out the second sheet 14 together with the second die 32 and the third sheet 16 on the second sheet 14. That is, the second sheet 14 is punched out with the third sheet 16 provided on the second sheet 14. Here, the second sheet 14 and the third sheet 16 are punched out while being sandwiched between the second die 32 and the second sheet pressing portion 50 disposed opposite to the second die 32. In this way, the second punch 34 punches out the second sheet 14 and the third sheet 16 conveyed between its tip surface 342 and the second through-hole 322 together with the second die 32. In this case, the second die 32 is movable in the vertical direction and ascends until its upper surface contacts the lower surface of the first die 22.

[0054] (Laminating Process) In the laminating process, while holding the punched first sheet 12 on the tip surface 242 of the first punch 24, the first punch 24 is inserted into the first through-hole 222, and while holding the punched second sheet 14 and the third sheet 16 on the tip surface 342 of the second punch 34, the second punch 34 is inserted into the second through-hole 322 to laminate the punched first sheet 12 and the punched second sheet 14 and the third sheet 16.

[0055] The first punch 24 inserts the first through hole 222 while holding the punched first sheet 12 on the tip surface 242 by the first suction portion 60. The first punch 24 can have the first suction portion 60 that sucks the first sheet 12 on its tip surface 242. The first punch 24 can further hold the first sheet 12 punched on the tip surface 242 by the first suction portion 60. Thus, when the first punch 24 has the first suction portion 60, it becomes possible to move and stack the punched first sheet 12 while further holding it on the first punch 24. Therefore, the occurrence of misalignment of the first sheet 12 is further suppressed. From the viewpoint of preventing the formation of indentation-like irregularities on the surface of the laminate 10 to be manufactured, the tip surface 242 of the first punch 24 is preferably flush. That the tip surface 242 is flush means, for example, that the lower surface of the first suction portion 60 (i.e., the lower surface of the porous body 64) and the surfaces on both end sides of the tip surface 242 of the first punch 24 are in the same plane.

[0056] The second punch 34 inserts the second through hole 322 while holding the punched second sheet 14 and third sheet 16 on the tip surface 342 by a second suction portion (not shown). The second punch 34 can have the second suction portion that sucks the second sheet 14 and third sheet 16 on its tip surface 342. The second punch 34 can further hold the second sheet 14 and third sheet 16 punched on the tip surface 342 by the second suction portion. Thus, when the second punch 34 has the second suction portion, it becomes possible to move and stack the punched second sheet 14 and third sheet 16 while further holding them on the second punch 34. Therefore, the occurrence of misalignment of the second sheet 14 and third sheet 16 is further suppressed.

[0057] Further, after punching out the first sheet 12, the first punch 24 descends within the third through-hole 42 of the first sheet presser portion 40 while holding the punched-out first sheet 12 on its tip surface 242. After punching out the second sheet 14 and the third sheet 16, the second punch 34 ascends within the fourth through-hole 52 of the second sheet presser portion 50 while holding the punched-out second sheet 14 and third sheet 16 on its tip surface 342. As a result, the first punch 24 and the second punch 34 sandwich the punched-out first to third sheets 12, 14, 16.

[0058] (Imprinting process) In the imprinting process, the first punch 24 and the second punch 34 apply heat and / or pressure to the laminate 10. Specifically, with the first die 22 ascending and the second die 32 descending so that the first die 22 and the second die 32 are separated from each other (that is, with the laminate 10 removed from the dies 22, 32) as shown in FIG. 2C, heat and / or pressure can be applied to the laminate 10 by the first punch 24 and the second punch 34. The application is performed from both sides of the first punch 24 and the second punch 34 toward the laminate 10 while the laminate 10 is held by the first punch 24 and the second punch 34. In this way, the laminate 10 is manufactured. Further, by applying heat and / or pressure (particularly, pressure) with the laminate 10 removed from the first die 22 and the second die 32, even if the laminate 10 expands in the XY plane direction during application, it is possible to prevent the cut surface of the laminate 10 from coming into contact with the first die 22 and the second die 32 and being deformed. The laminate 10 manufactured by the apparatus 1 according to the first embodiment is, for example, the laminate shown in FIG. 1(a). The pressure is, for example, 10 MPa to 100 MPa, or 30 MPa to 70 MPa.

[0059] In Inca engineering, for example, a relatively large pressure such as 10 MPa to 100 MPa is applied to the laminate 10. Thereafter, when the first punch 24 and the second punch 34 move away from each other, the laminate 10 may stick to the tip surface 242 of the first punch 24 or the tip surface 342 of the second punch 34. In order to easily take out (pay out) the laminate 10 in a subsequent conveying process, if necessary, a pressurizing process can be performed by the first suction part (first suction and exhaust part) 60 and the second suction part (second suction and exhaust part).

[0060] Taking the pressurizing process by the first suction and exhaust part 60 as an example for explanation. Since the second suction and exhaust part is substantially the same as the first suction and exhaust part 60, the explanation thereof is omitted. The first suction and exhaust part 60 can further have a pressurizing part (not shown) communicating with the first suction path 62. By pressurizing through the communication holes of the porous body 64 arranged on the tip surface 242 of the first punch 24 (that is, by making the vicinity of the openings of the communication holes of the porous body 64 a pressurized atmosphere), the laminate 10 stuck to the tip surface 242 is peeled off from the tip surface 242.

[0061] (Conveying process) In the conveying process, the produced laminate 10 is conveyed. As shown in FIG. 2D, the first punch 24 rises and the second punch 34 descends so as to be away from the laminate 10. Here, in order to facilitate the conveyance of the produced laminate 10, the second punch 34 can be arranged so as to protrude from the second sheet pressing part 50. The laminate 10 produced by a conveying part (not shown) is conveyed, and the cut ends of the first to third sheets 12, 14, 16 are removed. The conveying part is, for example, a conveying arm. The first punch 24 and the second punch 34 return to the arrangement shown in FIG. 2A, and new sheets 12, 14, 16 are conveyed. A new laminate 10 is produced in the same manner.

[0062] <Second Embodiment> Referring to FIG. 5, the apparatus according to the second embodiment will be described. FIG. 5 is a cross-sectional view of the first punch in the apparatus according to the second embodiment. The second embodiment differs from the first embodiment in that the configurations of the first and second suction portions are different. This different configuration will be described below. In the second embodiment, the same reference numerals as those in the first embodiment denote the same configurations as those in the first embodiment, and thus the description thereof will be omitted.

[0063] (Apparatus) The apparatus 1 according to the second embodiment includes a first suction portion 60A and a second suction portion. Since the second suction portion is substantially the same as the first suction portion 60A, the description thereof will be omitted. The first suction portion 60A includes an insert 63 fitted so that a slit-shaped opening 66 is formed at its outer edge when the tip surface 242 is viewed in plan (that is, when the tip surface 242 is viewed from the Z direction), and a decompression portion having a first suction passage 62A communicating with the slit-shaped opening 66. The main surface of the insert 63 constitutes a part of the tip surface 242. That is, the insert 63 constitutes a part of the tip surface 242 so as to be exposed from the tip surface 242 of the first punch 24A. Thus, by the main surface of the insert 63 constituting a part of the tip surface 242, the slit-shaped opening 66 is formed. Thereby, intake through the slit-shaped opening 66 becomes possible. The intake by the first suction portion 60A is performed, for example, in the lamination step of the method for manufacturing the laminate 10 described later. When the first punch 24A has the first suction portion 60A, it becomes possible to move and laminate the punched first sheet 12 while further holding it on the first punch 24. Therefore, the occurrence of misalignment of the first sheet 12 is further suppressed.

[0064] More specifically, in the first suction portion 60A, the reduced-pressure portion sucks through the slit-shaped opening 66 disposed on the tip surface 242 of the first punch 24A (that is, by making the vicinity of the slit-shaped opening 66 into a reduced-pressure atmosphere), and holds the first sheet 12 on the tip surface 242 of the first punch 24A. The width w of the slit-shaped opening 66 is, for example, 0.1 to 100 μm, or 1 μm to 30 μm. In this way, since the first sheet 12 is held by the slit-shaped opening 66 having a fine width w, for example, even if a relatively large pressure such as 50 MPa is applied to the laminate 10 in the applying step, indentation-like irregularities are less likely to occur on the first sheet 12.

[0065] The first suction portion 60A can further have a pressurizing portion (not shown) communicating with the first suction passage 62A. By the pressurizing portion pressurizing through the slit-shaped opening 66 (that is, by making the vicinity of the slit-shaped opening 66 into a pressurized atmosphere), exhaust through the tip surface 242 becomes possible. The exhaust by the first suction portion (or the first suction and exhaust portion) 60A is performed, for example, in the applying step of the method for manufacturing the laminate 10 described later. When the first punch 24 has the first suction and exhaust portion 60A, even if the laminate 10 adheres to the tip surface 242, the laminate 10 can be easily taken out in the subsequent conveying step.

[0066] The material of the insert 63 is, for example, metal. The outer edge shape of the insert 63 in the XY plane is, for example, a substantially circle and a substantially polygon (more specifically, a substantially triangle, a substantially quadrilateral, a substantially pentagon, a substantially hexagon, etc.). These shapes may be single or a plurality of them may be combined. As a plurality of combinations, for example, a shape that becomes a double circle of concentric circles.

[0067] <Third Embodiment> Referring to FIGS. 6A to 6D, the apparatus according to the third embodiment will be described. FIGS. 6A to 6D are cross-sectional views of the apparatus according to the third embodiment. The third embodiment is different from the first embodiment in that the cross-sectional shape and / or cross-sectional size of the first punch are different from the cross-sectional shape and / or cross-sectional size of the second punch, respectively. This different configuration will be described below. In the third embodiment, the same reference numerals as those in the first embodiment are omitted from the description because they have the same configuration as the first embodiment.

[0068] In the apparatus 1B according to the third embodiment, as shown in FIGS. 6A to 6D, the first punch 24B has a different cross-sectional shape and / or cross-sectional size from the second punch 34 in a plane perpendicular to the insertion / extraction direction (i.e., a plane parallel to the XY plane). The laminate 10B manufactured by the apparatus 1B according to the third embodiment is, for example, the laminate shown in FIG. 1(b). In the laminate 10B, the width (length in the Y direction) of the first sheet 12 is smaller than the widths of the second and third sheets 14 and 16. In the laminate 10B, another layer (more specifically, an insulating layer) can be formed on both side surfaces of the first sheet 12. In this case, the insulation (more specifically, electrical insulation, thermal insulation, etc.) between the first sheet 12 and the second sheet 14 can be further improved.

[0069] In the third embodiment, a laminate 10B composed of the first sheet 12 having different shapes and / or sizes, the second sheet 14, and the third sheet 16 can be manufactured. Therefore, for example, a laminate 10B with a high degree of design freedom can be manufactured, such as changing the size and shape of the constituent sheets according to the performance required for the laminate 10B.

[0070] <Fourth Embodiment> Referring to FIGS. 7A to 7D, the apparatus according to the fourth embodiment will be described. FIGS. 7A to 7D are cross-sectional views of the apparatus according to the fourth embodiment. The fourth embodiment is different from the first embodiment in that it has a third die in which the first die and the second die are integrated, punches the first sheet and the second sheet non-simultaneously, and is provided with a third sheet 16 formed in a predetermined shape in advance in the third die. Since the first difference (integrated third die) and the second difference (non-simultaneous punching) will be described later as modifications of the first embodiment, the description thereof will be omitted. Therefore, in the fourth embodiment, the third difference will be mainly described. In the fourth embodiment, the same reference numerals as those in the first embodiment are used for the same components as in the first embodiment, and the description thereof will be omitted.

[0071] [Apparatus] In the apparatus 1C according to the fourth embodiment, a third sheet 16 having a predetermined shape is fixed by a third die 70. In the fourth embodiment, the third sheet 16 can have a different shape and / or a different size from at least one of the first sheet 12 and the second sheet 14. Therefore, for example, depending on the performance required for the laminate 10C, a laminate 10C with a high degree of design freedom can be manufactured, such as changing the size and shape of the third sheet 16 that constitutes it.

[0072] The third die 70C has a sheet fixing portion 74. The third die 70C fixes the third sheet 6 by fitting the end portion of the third sheet 16 into the sheet fixing portion 74. The sheet fixing portion 74 is a recess formed in the fifth through hole 72 of the third die 70C. The sheet fixing portion 74 is not limited to the sheet fixing portion shown in FIGS. 7A to 7D, and can take various shapes, materials, and structures according to the shape and size of the third sheet 16, without impairing the effects of the present disclosure and without inhibiting the fixing of the third sheet 16 and the removal of the manufactured laminate 10C.

[0073] The laminate 10C manufactured by the apparatus 1C according to the fourth embodiment is, for example, the laminate shown in FIG. 1(c). In the laminate 10C, the width of the third sheet 16 (the length in the Y direction) is larger than the widths of the first and second sheets 12 and 14. Therefore, the insulation between the first sheet 12 and the second sheet 14 (more specifically, electrical insulation, thermal insulation, etc.) can be further improved.

[0074] [Method of manufacturing a laminate] (Third sheet placement step) The method of manufacturing the laminate 10C according to the fourth embodiment further includes a third sheet placement step before the first sheet punching step and the second sheet punching step. In the third sheet placement step, the third sheet 16 that has been pre-processed into a predetermined shape is placed in the apparatus 1C. In the third sheet placement step, for example, the third sheet 16 can be placed in the third die 70C by moving it in the X direction.

[0075] (Second sheet punching step) In the second sheet punching step after the first sheet punching step, only the second sheet 14 is punched.

[0076] (Lamination step) In the lamination step, the third sheet 16 that has been pre-formed into a predetermined shape is laminated between the punched first sheet 12 and the punched second sheet 14.

[0077] (Conveying step) The manufactured laminate 10C is removed from the apparatus 1C and conveyed. In the conveying step, for example, the laminate 10C can be taken out from the third die 70C by moving it in the X direction.

[0078] <Other embodiments> Note that the present disclosure is not limited to the above-described embodiments, and design changes can be made without departing from the gist of the present disclosure. Also, the features of the first to fourth embodiments may be combined in various ways. For example, the following modification examples can be cited.

[0079] In the first embodiment, the apparatus 1 was a sheet-fed apparatus in which the cut first to third sheets 12, 14, 16 were intermittently conveyed to the first and second punching portions 20, 30, but is not limited thereto. For example, the apparatus 1 may be a roll-to-roll apparatus in which the first to third sheets 12, 14, 16 are continuously conveyed to the first and second punching portions 20, 30.

[0080] In the first embodiment, the apparatus 1 included the first and second sheet pressing portions 40, 50, but is not limited thereto. The apparatus 1 may include either the first or second sheet pressing portion 40, 50.

[0081] In the first embodiment, the apparatus 1 included the first die 22 and the second die 32 in a separated state, but is not limited thereto. The first die 22 and the second die 32 may be, for example, an integrated third die 70. With reference to FIGS. 8A to 8D, a modification of this first embodiment will be described with the difference (having the third die 70 in which the first die 22 and the second die 32 are integrated). FIGS. 8A to 8D are cross-sectional views of the apparatus 1D according to a modification of the first embodiment. In the modification of the first embodiment, the same reference numerals as those in the first embodiment denote the same configurations as those in the first embodiment, and thus the description thereof will be omitted.

[0082] [Apparatus] In the apparatus 1D according to the modification of the first embodiment, the first punching portion 20D and the second punching portion 30D have a third die 70 in which the first die 22 and the second die 32 are integrated. In the third die 70, the fifth through hole 72 is for the first punch 24 and the second punch 34 to pass through.

[0083] [Method for manufacturing a laminate] (First sheet punching step) The third die 70 is fixed, and as shown in FIGS. 8A to 8D, the first punch 24 descends so as to approach the fixed third die 70. The first sheet 12 is punched while being sandwiched between the third die 70 and the first sheet pressing portion 40.

[0084] (Second sheet punching step) As shown in FIGS. 8A to 8D, the second punch 34 rises so as to approach the fixed third die 70. The second sheet 14 and the third sheet 16 are punched while being sandwiched between the third die 70 and the second sheet presser portion 50.

[0085] (Lamination process) The punched first sheet 12 is guided and moved to the fifth through hole 72 of the third die 70 while being held on the tip surface 242 of the first punch 24. The punched second sheet 14 and third sheet 16 are guided and moved to the fifth through hole 72 of the third die 70 while being held on the tip surface 342 of the second punch 34. The first punch 24 and the second punch 34 laminate the punched first sheet 12, the punched second sheet 14, and the third sheet 16.

[0086] In the above modification of the first embodiment, the apparatus 1D punches the first sheet 12, the second sheet 14, and the third sheet substantially simultaneously, but is not limited thereto. For example, the first sheet 12, the second sheet 14, and the third sheet may be punched non-simultaneously. As an example of punching a plurality of sheets non-simultaneously, an example is given in which the first sheet 12 is punched first, and then the second sheet 14 and the third sheet 16 are punched. Of course, the punching order may be reversed.

[0087] Referring to FIGS. 9A to 9D, another modification of the first embodiment will be described with differences (punching the first sheet 12, the second sheet 14, and the third sheet non-simultaneously). FIGS. 9A to 9D are cross-sectional views of an apparatus 1E according to another modification of the first embodiment. In another modification of the first embodiment, the same reference numerals as those in the above modification of the first embodiment have the same configuration as those in the above modification of the first embodiment, and thus the description thereof is omitted.

[0088] [Apparatus] An apparatus 1E according to another modification of the first embodiment is substantially the same as the structure of the apparatus 1D according to the above modification of the first embodiment. A control unit (not shown) that controls the operations of the first punching unit 20D and the second punching unit 30D is different.

[0089] [Method for manufacturing a laminate] (First sheet punching step and second sheet punching step) As shown in FIGS. 9A to 9D, first, the first sheet 12 is punched by the first punching portion 20D, and then the second sheet 14 and the third sheet 16 are punched by the second punching portion 30D. In this way, the laminate 10 is manufactured.

[0090] In the first embodiment, both the first and second punches 24 and 34 of the apparatus 1 had a suction portion, but the present invention is not limited thereto. Either the first or second punch 24 or 34 of the apparatus 1 may have a suction portion.

[0091] In the first embodiment, in the second sheet punching step, the second sheet 14 was punched in a state where the third sheet 16 was provided on the second sheet 14, but the present invention is not limited thereto. For example, in the first sheet punching step, the first sheet 12 may be punched in a state where the third sheet 16 is provided on the first sheet 12 (more specifically, in a state where the third sheet 16 and the first sheet 12 provided on the third sheet 16 overlap). In this case, the obtained laminate 10 has substantially the same layer configuration as the laminate 10 manufactured in the first embodiment. Alternatively, in the first sheet punching step, the first sheet 12 may be punched in a state where the third sheet 16 is provided on the first sheet 12, and in the second sheet punching step, the second sheet 14 may be punched in a state where the third sheet 16 is provided on the second sheet 14. In this case, the obtained laminate 10 has a layer configuration in which two third sheets 16 are laminated on the second sheet 14, and further, the first sheet 12 is laminated on the third sheet 16.

[0092] In the first embodiment, the first die 22 and the second die 32 were movable, but the present invention is not limited thereto. For example, the first die 22 and the second die 32 may be fixed.

[0093] In the first embodiment, nothing is arranged between the first die 22 and the second die 32, but a plate may be further arranged while the first die 22 and the second die 32 are respectively positioned one above the other. In this way, the device 1 may have a three-stage structure.

[0094] In the first and second embodiments, the first and second punches 24 and 34 of the device 1 both had the same type of suction portion, but the present invention is not limited to this. For example, one of the first and second punches 24 and 34 of the device 1 may have the suction portion of the first embodiment, and the other may have the suction portion of the second embodiment.

[0095] In the device 1E according to the modification of the first embodiment and the device 1C according to the fourth embodiment, the laminate 10 and 10C were manufactured such that the first punch 24 and the second punch 34 approached the fixed third dies 70 and 70C, but the present invention is not limited to this. For example, the second punch 34 and the second punch holder 36 may be fixed, and the third dies 70 and 70C may be movable in the vertical direction. In this case, the first punch 24 and the third dies 70 and 70C descend so as to approach the second punch 34. Also, a modification of the first embodiment in which the dies 22 and 32 are not integrated may be used. In this modification, for example, the second punch holder 36 is fixed. First, the first punching portion 20 excluding the first die 22 descends first. Thereby, the first sheet 12 is sandwiched and fixed between the first die 22 and the first sheet pressing portion 40. In this state, the first punch 24 punches the first sheet 12 together with the first die 22. Then, the first die 22 and the second die 32 descend. Thereby, the second sheet 14 and the third sheet 16 are sandwiched and fixed between the second die 32 and the second sheet pressing portion 50. In this state, when the second die 32 and the second sheet pressing portion 50 descend, the second punch 34 punches the second sheet 14 and the third sheet 16 together with the second die 32.

[0096] In the fourth embodiment, the third sheet 16 having a predetermined shape was fixed to the third die 70, but the present invention is not limited to this. For example, the third sheet 16 having a predetermined shape may be fixed to the first die 22 or the second die 32.

Explanation of Reference Numerals

[0097] 1, 1B, 1C, 1D, 1E ··· Apparatus for manufacturing a laminate 10, 10B, 10C ··· Laminate 12 ··· First sheet 122 ··· Layer of the positive current collector 124 ··· Layer of the positive active material 14 ··· Second sheet 142 ··· Layer of the negative current collector 144 ··· Layer of the negative active material 16 ··· Third sheet 20, 20C, 20D ··· First punched portion 22, 22B ··· First die 222 ··· First through-hole 24, 24A, 24B ··· First punch 242 ··· Tip surface of the first punch 30, 30C, 30D ··· Second punched portion 32 ··· Second die 322 ··· Second through-hole 34 ··· Second punch 342 ··· Tip surface of the second punch 40, 40B ··· First sheet pressing portion 42 ··· Third through-hole of the first sheet pressing portion 50 ··· Second sheet pressing portion 52 ··· Fourth through-hole of the second sheet pressing portion 60, 60A ··· First suction portion 62, 62A ··· First suction path 63 ··· Insert 64 ··· Porous body 66 ··· Slit-shaped opening 70, 70C ··· Third die 72 ··· Fifth through-hole 74 ··· Sheet fixing portion

Claims

1. An apparatus for manufacturing a laminate in which a first sheet, a second sheet, and a third sheet are laminated, comprising: a first punching part for punching the first sheet, and a second punching part which is arranged opposite to the first punching part and punches the second sheet; the first punching part has a first die provided with a first through-hole, and a first punch which is arranged opposite to the first die and is configured to be insertable into and removable from the first through-hole; the first punch punches the first sheet conveyed between its tip surface and the first through-hole together with the first die, and inserts the punched first sheet through the first through-hole while holding the punched first sheet on the tip surface; the second punching part can be integrated with the first die, and has a second die provided with a second through-hole, and a second punch which is arranged opposite to the second die and is configured to be insertable into and removable from the second through-hole; the second punch punches the second sheet conveyed between its tip surface and the second through-hole together with the second die, and inserts the punched second sheet through the second through-hole while holding the punched second sheet on the tip surface; the first punch and the second punch laminate and sandwich the punched first sheet and the punched second sheet; the first sheet is composed of one or more layers including a positive electrode current collector; the second sheet is composed of one or more layers including a negative electrode current collector; the third sheet is an electrolyte layer; An apparatus for manufacturing a laminate, in which the first sheet and the second sheet are laminated via the third sheet.

2. The apparatus further comprises a sheet pressing part arranged on at least one side opposite to the first die and the second die, wherein the sheet pressing part presses the first sheet to be punched or the second sheet to be punched. The apparatus for manufacturing a laminate according to claim 1.

3. The apparatus for manufacturing a laminate according to claim 1 or 2, further comprising a suction part for sucking the first sheet or the second sheet on at least one tip surface of the first punch and the second punch.

4. The suction part comprises: a porous body having communication holes; a decompression part having a suction path communicating with the communication holes; and has; The apparatus for manufacturing a laminate according to claim 3, wherein a main surface of the porous body constitutes a part of the tip surface.

5. The suction part comprises: a fitting fitted so that a slit-shaped opening is formed at an outer edge thereof when the tip surface is viewed in a plan view; a decompression part having a suction path communicating with the slit-shaped opening; and has; The main surface of the insert forms part of the tip surface, and the apparatus for manufacturing a laminate according to claim 3.

6. In a plane perpendicular to the insertion / removal direction, the first punch has a different cross-sectional shape and / or cross-sectional size from the second punch, and the apparatus for manufacturing a laminate according to any one of claims 1 to 5.

7. A third sheet having a predetermined shape is fixed by the first die, the second die, or a third die formed by integrating the first die and the second die, and the laminate is manufactured by laminating the first sheet and the second sheet via the third sheet, and the apparatus for manufacturing a laminate according to any one of claims 1 to 6.

8. The apparatus for manufacturing a laminate according to claim 7, wherein the laminate is a battery.

9. A method for manufacturing a laminate in which a first sheet, a second sheet, and a third sheet are laminated, A first sheet punching step of punching a first sheet by a first punching portion having a first die provided with a first through hole and a first punch configured to be insertable into and removable from the first through hole and opposed to the first die, A second punching portion having a second die that can be integrated with the first die and is provided with a second through hole, and a second punch configured to be insertable into and removable from the second through hole and opposed to the second die, and the second punching portion is disposed opposite to the first punching portion, and a second sheet punching step of punching a second sheet, While holding the punched first sheet on the tip surface of the first punch, inserting the first punch through the first through hole, and while holding the punched second sheet on the tip surface of the second punch, inserting the second punch through the second through hole, and a laminating step of laminating the punched first sheet and the punched second sheet Comprising: The first sheet is composed of one or more layers including a positive electrode current collector, The second sheet is composed of one or more layers including a negative electrode current collector, The third sheet is an electrolyte layer, A method for manufacturing a laminate in which the first sheet and the second sheet are laminated via the third sheet.

10. In the first sheet punching step, the first sheet is punched while being sandwiched between the first die and a first sheet pressing portion disposed opposite to the first die, and / or In the second sheet punching step, the second sheet is punched in a state of being sandwiched between the second die and a second sheet pressing portion disposed opposite to the second die, the method for manufacturing a laminate according to claim 9.

11. In the laminating step, the first punch passes through the first through-hole while holding the first sheet punched on the tip surface of the first punch by the first suction portion of the first punch, and / or the second punch passes through the second through-hole while holding the second sheet punched on the tip surface of the second punch by the second suction portion of the second punch, the method for manufacturing a laminate according to claim 9 or 10.

12. In the first sheet punching step and the second sheet punching step, the first sheet and the second sheet are punched in a state where a third sheet is provided on at least one of the first sheet and the second sheet, the method for manufacturing a laminate according to any one of claims 9 to 11.

13. In the laminating step, a third sheet pre-formed into a predetermined shape is laminated between the punched first sheet and the punched second sheet, the method for manufacturing a laminate according to any one of claims 9 to 11.

Images