Laminate manufacturing apparatus and method for manufacturing laminates

Abstract

To provide a device for manufacturing a lamination body for suppressing the generation of a short circuit.SOLUTION: A lamination body excluding a separation type film from a lamination construction, is manufactured. The lamination body contains: a press unit of manufacturing the lamination construction; and a peeling unit for peeling the separation type film from the lamination construction. In the lamination construction, a first sheet formed by providing one of a first layer containing one of a positive electrode layer and a negative electrode layer and a second layer containing the other of the positive electrode layer and the negative electrode layer and an electrolyte layer to one of the separation type film and a collector, and a second sheet formed by providing the other one of the first layer and the second layer to the other one of the separation type film and the collector are supplied onto a die so that the separation type film and the collector are faced to a punch, the first sheet and the second sheet are punched by the punch, the punched first sheet and the punched second sheet are laminated, and one layer of the separation type film, the electrolyte layer, the other layer, and the collector are contained in sequence.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a laminate manufacturing apparatus and a laminate manufacturing method, and more particularly to a laminate manufacturing apparatus and a laminate manufacturing method for a laminate for producing solid-state batteries. BACKGROUND ART

[0002] In the production of a laminate composed of a plurality of sheets, for example, each sheet is processed into a desired shape and size and laminated in order to satisfy the performance required for the laminate. 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 (electrolyte layer) has functions of electrically insulating the positive electrode and the negative electrode and allowing ions to pass therethrough.

[0003] In secondary batteries, the positive electrode sheet, the negative electrode sheet, and the separator sheet may be laminated with misalignment from the design, which may cause generation of dendrites during repeated charge and discharge, resulting in electrical short circuits. For the purpose of reducing such misalignment, for example, Patent Document 1 discloses a method of previously producing a laminate including a positive electrode, a separator, and a negative electrode, and punching the laminate at one time. PRIOR ART DOCUMENTS PATENT DOCUMENTS

[0004] PATENT DOCUMENT 1 Japanese Unexamined Patent Publication No. 2018-113190 SUMMARY OF INVENTION PROBLEMS TO BE SOLVED BY THE INVENTION

[0005] However, in laminates manufactured by the method described in Patent Document 1, short circuits may not be sufficiently suppressed. For example, in laminates manufactured by the method disclosed in Patent Document 1, burrs may be generated near the cut surface of the punched laminate, causing the distance between the positive electrode sheet and the negative electrode sheet to become locally smaller, which can make short circuits more likely to occur. In addition, material flow may occur at the cut surface of the laminate due to the cutting tool, and as a result, short circuits may be more likely to occur due to the active material and conductive additive adhering to the cut surface. Furthermore, in recent years, the development and manufacture of bipolar all-solid-state batteries, in which there is one current collector layer per laminated unit, has progressed. In bipolar all-solid-state batteries, either the positive or negative electrode foil is unnecessary. However, since the positive and negative electrode layers are not solid materials, processing requires coating them onto a sheet, for example. For instance, after forming a cell by forming one of the positive or negative electrode layers on a release film, the release film is unnecessary for the manufacture of bipolar all-solid-state batteries and must be removed. However, the process of peeling off the release film after cell formation can affect battery performance, and there is a concern that short circuits may easily occur between the positive and negative electrode layers.

[0006] This disclosure has been made in view of the above issues. Specifically, the primary purpose of this disclosure is to provide an apparatus for manufacturing a laminate that further suppresses the occurrence of short circuits (laminated laminate manufacturing apparatus) and a method for manufacturing such a laminate (laminated laminate manufacturing method). [Means for solving the problem]

[0007] A laminate manufacturing apparatus according to one embodiment of the present disclosure. A press unit that produces a laminated structure comprising: a first sheet having a first layer including one of a positive electrode layer and a negative electrode layer, and a second sheet having one of the positive electrode layer and the other of the negative electrode layer and an electrolyte layer, provided on one of a release film and a current collector; and a second sheet having the other of the first and second layers provided on the other of a release film and a current collector, supplied onto a die such that the release film and the current collector face a punch, punching out the first sheet and the second sheet respectively with the punch, and laminating the punched first sheet and the punched second sheet to produce a laminated structure comprising the release film, the one layer, the electrolyte layer, the other layer and the current collector in that order, A release unit for separating the release film from the laminated structure, Includes, A laminate is manufactured by removing the release film from the aforementioned laminated structure.

[0008] A method for manufacturing a laminate according to one embodiment of the present disclosure is: A step of preparing a first sheet in which one of the following is provided on one of the release film and current collector: a first layer including one of the positive electrode layer and the negative electrode layer and a second layer including the other of the positive electrode layer and the negative electrode layer and an electrolyte layer; and a second sheet in which the other of the first layer and the second layer is provided on the other of the release film and current collector. A pressing step comprising: supplying the first sheet and the second sheet onto a die so that the release film and the current collector face the punch, punching them out with the punch, and laminating the punched first sheet and the punched second sheet to produce a laminated structure that sequentially includes the release film, one layer, the electrolyte layer, the other layer, and the current collector; The process includes a peeling step of separating the release film from the laminated structure, A laminate is manufactured by removing the release film from the aforementioned laminated structure. [Effects of the Invention]

[0009] This disclosure can provide an apparatus for manufacturing a laminate that further suppresses the occurrence of short circuits, and a method for manufacturing such a laminate. [Brief explanation of the drawing]

[0010] [Figure 1] Figure 1 shows the overall configuration of a manufacturing apparatus for a bipolar all-solid-state battery, which is one embodiment of the apparatus. (a) is a block diagram, and (b) is an illustrative diagram showing the operation of the apparatus or the components made up by the apparatus in each block. [Figure 2] Figure 2 is a schematic diagram showing the configuration of the press unit of the laminate manufacturing apparatus according to the first embodiment. [Figure 3A] Figure 3A is a cross-sectional view showing the first punching section and the second punching section of the press unit in the first embodiment. [Figure 3B] Figure 3B is a cross-sectional view showing the punching process in the first punching section and the second punching section of the press unit in the first embodiment. [Figure 3C] Figure 3C is a cross-sectional view showing the stacking process in the press unit of the first embodiment. [Figure 3D] Figure 3D is a cross-sectional view showing the process of removing a laminate from the press unit of the first embodiment. [Figure 4] Figure 4 is a cross-sectional view of a first punch in one embodiment of the press unit according to the first embodiment. [Figure 5] Figure 5 is a cross-sectional view of the first punch in another embodiment according to the first embodiment. [Figure 6] Figure 6 is a schematic diagram showing the configuration of the peeling unit of the laminate manufacturing apparatus according to the first embodiment. [Figure 7A] Figure 7A shows the state of the peeling unit of the first embodiment when the peeling section and the table are aligned. [Figure 7B] Figure 7B shows the state when the peeling portion and one end of the laminated structure are in contact in the peeling unit of the first embodiment. [Figure 7C] Figure 7C shows the state when the release film is separated from the laminated structure by the release section in the release unit of the first embodiment. [Figure 8A]FIG. 8A is a diagram showing one form of the peeling part in the peeling unit of the first embodiment. [Figure 8B] FIG. 8B is a diagram showing another form of the peeling part in the peeling unit of the first embodiment. [Figure 9A] FIG. 9A is a cross-sectional view showing the first punching part and the second punching part of the press unit in the second embodiment. [Figure 9B] FIG. 9B is a cross-sectional view showing the state during punching at the first punching part and the second punching part of the press unit in the second embodiment. [Figure 9C] FIG. 9C is a cross-sectional view showing the state during lamination in the press unit of the second embodiment. [Figure 9D] FIG. 9D is a cross-sectional view showing the state when taking out the laminate in the press unit of the second embodiment. [Figure 10] FIG. 10 is a cross-sectional view of a laminated structure manufactured by the press unit of the second embodiment, where (a) is a cross-sectional view of a laminated structure manufactured by the press unit of the first embodiment, and (b) is a cross-sectional view of a laminated structure manufactured by the press unit of a comparative example. [Figure 11A] FIG. 11A is a cross-sectional view showing a modified example of the press unit according to the second embodiment. [Figure 11B] FIG. 11B is a cross-sectional view showing a modified example of the press unit according to the second embodiment. [Figure 11C] FIG. 11C is a cross-sectional view showing a modified example of the press unit according to the second embodiment. [Figure 11D] FIG. 11D is a cross-sectional view showing a modified example of the press unit according to the second embodiment. [Figure 12A] FIG. 12A is a cross-sectional view showing another modified example of the press unit according to the second embodiment. [Figure 12B] FIG. 12B is a cross-sectional view showing another modified example of the press unit according to the second embodiment. [Figure 12C] FIG. 12C is a cross-sectional view showing another modified example of the press unit according to the second embodiment. [Figure 12D]Figure 12D is a cross-sectional view showing another modified example of the press unit according to the second embodiment. [Modes for carrying out the invention]

[0011] The manufacturing apparatus for solid-state battery manufacturing according to the embodiments of this disclosure is used, for example, in the manufacture of a bipolar all-solid-state battery and includes a sheet manufacturing apparatus 75, a laminate manufacturing apparatus 80, and a laminate electrode formation cell assembly apparatus 90, as shown in Figure 1(a). Furthermore, the laminate manufacturing apparatus 80 includes a press unit 1 and a peeling unit 8. In the following description, the positive electrode layer is, for example, a positive electrode active material layer for a lithium-ion battery, and the negative electrode layer is, for example, a negative electrode active material layer for a lithium-ion battery. The following describes each device with reference to Figures 1(a) and 1(b).

[0012] [Sheet manufacturing equipment 75] The sheet manufacturing device 75 is (i) A first sheet comprising a first layer including one of the positive electrode layer and the negative electrode layer, and a second layer including the other of the positive electrode layer and the negative electrode layer and an electrolyte layer, provided on one of the release film and the current collector, (ii) A second sheet in which the other of the first and second layers is provided on the other of the release film and current collector, To manufacture. For example, as shown in Figure 1(b), the first sheet 12 includes a release film 12a and a positive electrode layer 124 provided on one main surface of the release film 12a, and the second sheet 14 includes a current collector 142, a negative electrode layer 144 provided on one main surface of the current collector 142 and an electrolyte layer 16 provided on the negative electrode layer 144.

[0013] The thickness of the first sheet 12 and the second sheet 14 is, for example, 1 μm or more, 10 μm or more, 30 μm or more, 50 μm or more, or 100 μm or more, and also 1000 μm or less, 750 μm or less, 500 μm or less, 300 μm or less, or 100 μm or less. The thickness of the current collector 142 is, for example, 1 μm or more, 5 μm or more, 10 μm or more, or 50 μm or more, and also 500 μm or less, 300 μm or less, 100 μm or less, or 50 μm or less.

[0014] [Laminate manufacturing apparatus 80] As shown in Figure 1(a), the laminate manufacturing apparatus 80 includes a press unit 1 and a peeling unit 8. Press unit 1 supplies (i) a first sheet and (ii) a second sheet manufactured by sheet manufacturing apparatus 75 onto a die so that the release film and current collector face the punch, punches out the first sheet and the second sheet respectively, and laminates the punched-out first sheet and the punched-out second sheet to produce a laminated structure that sequentially includes (a) a release film, (b) one of the positive electrode layer and the negative electrode layer, (c) an electrolyte layer, (d) the other of the positive electrode layer and the negative electrode layer, and (e) a current collector. The release unit 8 separates the release film from the laminated structure produced by the press unit 1. In this manner, the laminate manufacturing apparatus 80 produces a laminate from which the release film has been removed from the laminated structure.

[0015] Figure 1(b) shows the first sheet 12 and the second sheet 14 after they have been manufactured and punched out, as shown in Figure 1(b). As shown in Figure 1(b), the first sheet 12 is punched out by supplying it onto the die so that the release film faces the punch. Therefore, if a burr is formed at the edge of the first sheet 12, the burr will be directed upward (in the opposite direction from the negative electrode layer). Although not shown in Figure 1(b), burrs can also be formed at the edge of the positive electrode layer 124. Furthermore, since the second sheet 14 is supplied onto the die so that the current collector faces the punch and punched out, if a burr is formed at the end of the second sheet 14, that burr will be directed downwards (in the opposite direction from the positive electrode layer). Although not shown in Figure 1(b), burrs can also form at the end of the negative electrode layer 144. Therefore, in the press unit 1, the first sheet 12 is supplied onto the die so that the release film faces the punch and punched out, and the second sheet 14 is supplied onto the die so that the current collector faces the punch and punched out. As a result, even if burrs are formed, these burrs do not shorten the distance between the positive electrode layer and the negative electrode layer at the edges, and short circuits between the positive electrode layer and the negative electrode layer can be effectively suppressed. This effect is not limited to the specific example of using Sheet 12 and Sheet 214, (i) A first sheet comprising a first layer including one of the positive electrode layer and the negative electrode layer, and a second layer including the other of the positive electrode layer and the negative electrode layer and an electrolyte layer, provided on one of the release film and the current collector, (ii) A second sheet in which the other of the first and second layers is provided on the other of the release film and current collector, The same effect can be obtained even when using [another method].

[0016] Furthermore, since the first sheet 12 is supplied onto the die so that the release film faces the punch and punched out, a burr pointing upward (in the direction of peeling off the release film) may be formed on the edge of the punched first sheet 12. In other words, a force is applied at the edge of the first sheet 12 in the direction of peeling off the release film, which weakens the adhesive force between the release film and the positive electrode layer. As a result, the release film can be easily peeled off by the peeling unit 8, that is, without applying excessive force, and damage to the edge of the positive electrode layer can be prevented. This effect is not limited to the specific example of Sheet 12, (i) A first sheet comprising a first layer including one of the positive electrode layer and the negative electrode layer, and a second layer including the other of the positive electrode layer and the negative electrode layer and an electrolyte layer, provided on one of the release film and the current collector, The same effect can be obtained even when using [another method]. Then, the release unit 8 separates the release film from the laminated structure produced by the press unit 1.

[0017] [Laminated electrode formation cell system 90] As shown in Figure 1(b), the laminated electrode formation cell assembly apparatus 90 stacks multiple laminates manufactured by the laminate manufacturing apparatus 80 as needed, then, for example, forms an electrode layer on the uppermost positive electrode layer, and seals the entire assembly as needed to form a cell.

[0018] In this specification, the term "laminated body" includes both a unit laminate (a laminate manufactured by the laminate manufacturing apparatus 80) containing one positive electrode layer, one electrolyte layer, and one negative electrode layer, and a multi-layer laminate (a laminate manufactured by the laminate electrode formation cell apparatus 90) which is made up of multiple unit laminates. However, the unit laminate is denoted as laminate U10 and the multi-layer laminate is denoted as laminate M10, and these are distinguished by their respective symbols.

[0019] The laminate manufacturing apparatus and method for manufacturing laminates described herein will be described in detail below with reference to the drawings. Note that the drawings include schematic representations and may not reflect actual dimensions or proportions.

[0020] The various numerical ranges referred to herein are intended to include the lower and upper numerical values ​​themselves (i.e., the upper and lower limits) unless otherwise specified, such as "less than," "greater than," and "less than." For example, the numerical range 1 to 10 is interpreted as a range that includes both the lower limit of "1" and the upper limit of "10" (i.e., 1 or greater and 10 or less), unless otherwise specified. Alternatively, one numerical range (e.g., 1 μm or more) selected from multiple numerical ranges that only specify a lower limit (e.g., 1 μm or more, 10 μm or more) may be combined with one numerical range (e.g., 100 μm or less) selected from multiple numerical ranges that only specify an upper limit (e.g., 300 μm or less, 100 μm or less) (e.g., 1 μm or more, 100 μm or less).

[0021] The positive electrode layer is a positive electrode active material layer for lithium-ion batteries, and the negative electrode layer is, for example, a negative electrode active material layer for lithium-ion batteries. The following provides a more detailed explanation of various forms of laminate manufacturing equipment. In the following description, the first sheet 12 and the second sheet 14 will be used as specific examples, but the present invention is not limited to the first sheet 12 and the second sheet 14.

[0022] <First Embodiment> The press unit 1 and peeling unit 8 of the laminate manufacturing apparatus (hereinafter also simply referred to as "apparatus") according to the first embodiment of this disclosure will be described in detail. [Press Unit 1] As shown in Figure 2, the press unit 1 includes a punching section 100 and a sheet supply section 101, and as shown in Figures 3A to 3D, it punches out a first sheet 12 and a second sheet 14 and then stacks them to manufacture a laminated structure 10. The sheet supply section 101 includes a first sheet roll 101A around which the first sheet 12 is wound and a second sheet roll 101B around which the second sheet 14 is wound. As shown in Figures 3A to 3D, the Z direction is the direction in which the first punching section 20 and the second punching section 30 face each other (directly opposite direction), and corresponds to the up and down direction. The X direction is perpendicular to the Z direction and perpendicular to the YZ plane (for example, the plane of paper). The Y direction is perpendicular to the Z and X directions and corresponds to the lateral direction.

[0023] The punching section 100 includes a first punching section 20 for punching out the first sheet 12 and a second punching section 30 for punching out the second sheet 14. The second punching section 30 is positioned opposite the first punching section 20.

[0024] (1st punching section) As shown in Figure 3A, the first punching unit 20 includes a first die 22 with a first through hole 222 and a first punch 24 facing the first die 22 and configured to be insertable into and removeable from the first through hole 222. The first punching unit 20 further includes a first sheet pressing unit 40, a first connecting unit 27 connected to the first sheet pressing unit 40, a first spring (not shown) provided to wind around the first connecting unit 27, and a first punch holder 26 for fixing the first punch 24, which has a first insertion hole 262 through which the first connecting unit 27 can be inserted. The first sheet pressing unit 40 is positioned facing the first die 22 and is provided with a third through hole 42.

[0025] 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.

[0026] The first punch 24 may have a first suction section (not shown in Figures 3A to 3D) on its tip surface 242 for drawing in the first sheet 12. One embodiment of the first suction section 60 will be described with reference to Figure 4. Figure 4 is an enlarged cross-sectional view of the first punch 24, showing a cross-sectional view of the first suction section. The first suction section 60 has a porous body 64 having communication holes and a depressurization section (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 that it is exposed from the tip surface 242. In this way, by the main surface of the porous body 64 constituting a part of the tip surface 242, air intake through the tip surface 242 is possible by the exposed porous body 64. Air intake by the first suction section 60 is performed, for example, in the lamination process of the manufacturing method of the laminated structure 10 described later. If the first punch 24 has a first suction section 60, it becomes possible to move and stack the punched first sheet 12 while it is further held on the first punch 24. Therefore, the occurrence of misalignment of the first sheet 12 is further suppressed.

[0027] More specifically, the porous body 64 has multiple fine communication holes with openings on its surface. The reduced pressure unit holds the first sheet 12 to the tip surface 242 of the first punch 24 by drawing air through the communication holes of the porous body 64 positioned on the tip surface 242 of the first punch 24 (that is, by creating a reduced pressure atmosphere near the openings of the communication holes in the porous body 64). In this way, the first sheet 12 is held by fine openings, so even if a relatively large pressure such as 50 MPa is applied to the laminated structure 10 in the application process described later, it is unlikely that indentation-like irregularities will 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 with relatively high compressive strength, such as stainless steel and cemented carbide.

[0028] The first suction section 60 may further have a pressurizing section (not shown) that communicates with the first suction passage 62. The pressurizing section pressurizes through the communication holes of the porous body 64 arranged on the tip surface 242 of the first punch 24 (that is, by creating a pressurized atmosphere near the opening of the communication holes of the porous body 64), thereby enabling exhaust through the tip surface 242. Exhaust by the first suction section (or first intake / exhaust section) 60 is performed, for example, in the application step of the manufacturing method of the laminated structure described later. If the first punch 24 has the first intake / exhaust section 60, even if the laminated structure 10 sticks to the tip surface 242, the laminated structure 10 can be easily removed in the subsequent transport step.

[0029] Referring to Figure 5, other embodiments of the suction section will be described. Figure 5 is a cross-sectional view of the first punch in another embodiment. The press unit 1 may include a first suction section 60A and a second suction section. The second suction section is substantially the same as the first suction section 60A and therefore will not be described. The first suction section 60A has an insert 63 fitted such that a slit-shaped opening 66 is formed on its outer edge when the tip surface 242 is viewed from above (i.e., when the tip surface 242 is viewed from the Z direction), and a depressurization section having a first suction passage 62A that communicates 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 of the first punch 24A so that it is exposed from the tip surface 242. In this way, the main surface of the insert 63 constitutes a part of the tip surface 242, thereby forming the slit-shaped opening 66. This enables air intake through the slit-shaped opening 66. The intake by the first suction section 60A is performed, for example, in the lamination process of the manufacturing method of the laminated structure 10 described later. When the first punch 24A has the first suction section 60A, it becomes possible to move and laminate the punched first sheet 12 while it is further held on the first punch 24. Therefore, the occurrence of misalignment of the first sheet 12 is further suppressed.

[0030] Here, the material of the nesting element 63 is, for example, metal. The outer shape of the nesting element 63 in the XY plane is, for example, a roughly circular shape and a roughly polygonal shape (more specifically, a roughly triangular shape, a roughly quadrilateral shape, a roughly pentagonal shape, and a roughly hexagonal shape, etc.). These shapes may be single or in combination. One example of a combination is a shape that forms a double circle with concentric circles.

[0031] More specifically, in the first suction section 60A, the depressurization section holds the first sheet 12 to the tip surface 242 of the first punch 24A by suction through a slit-shaped opening 66 located on the tip surface 242 of the first punch 24A (that is, the depressurization section creates a depressurized atmosphere near the slit-shaped opening 66). 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, the first sheet 12 is held by a slit-shaped opening 66 with a fine width w, so even if a relatively large pressure such as 50 MPa is applied to the laminated structure 10 in the application process, for example, dents and irregularities are less likely to occur on the first sheet 12.

[0032] The first suction section 60A may further have a pressurizing section (not shown) that communicates with the first suction passage 62A. By pressurizing through the slit-shaped opening 66 (i.e., by creating a pressurized atmosphere near the slit-shaped opening 66), exhaust is possible through the tip surface 242. Exhaust by the first suction section (or first intake / exhaust section) 60A is performed, for example, in the application step of the manufacturing method of the laminated structure 10 described later. If the first punch 24 has the first intake / exhaust section 60A, even if the laminated structure 10 sticks to the tip surface 242, the laminated structure 10 can be easily removed in the subsequent transport step.

[0033] (2nd punching section) As shown in Figure 3A, the second punching section 30 includes a second die 32 provided with a second through hole 322, and a second punch 34 facing the second die 32 and configured to be insertable into and remove from the second through hole 322. Here, the cross-sectional shapes perpendicular to the central axis of the second through hole 322 and the second punch 34 are larger and similar in shape to the cross-sectional shapes perpendicular to the central axis of the first through hole 222 and the first punch 24. Furthermore, the positional relationship between the second through-hole 322 and the second punch 34 and the first through-hole 222 and the first punch 24 is set such that the outer circumference of the first sheet 12 after punching is located inside the outer circumference of the second sheet 14 after punching. Preferably, the central axes of the second through-hole 322 and the second punch 34 coincide with the central axes of the first through-hole 222 and the first punch 24. The second punching section 30 further includes a second sheet pressing section 50, a second connecting section 37 connected to the second sheet pressing section 50, a second spring (not shown) provided to wind around the second connecting section 37, and a second punch holder 36 for fixing the second punch 34, through which the second connecting section 37 can be inserted and which has a second insertion hole 362. The second sheet pressing section 50 is positioned opposite the second die 32 and is provided with a fourth through hole 52.

[0034] The second punch 34 may have a second suction portion (not shown in Figures 3A to 3D) on its tip surface 342 for drawing in the second sheet 14. The second suction portion is substantially the same as the first suction portion 60, so its description is omitted.

[0035] The second punch 34 is configured to be insertable into and removeable 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 removeable from the fourth through hole 52 of the second sheet pressing portion 50, and moves up and down within the fourth through hole 52.

[0036] In the press unit 1 according to the first embodiment, a first punching section 20 and a second punching section 30 are arranged facing each other, and after punching out the first sheet 12 and the second sheet 14, the laminate is manufactured by sandwiching them between the first punching section 20 and the second punching section 30. In this way, the first and second sheets 12 and 14 are laminated so that their punching directions are opposite to each other. Therefore, even if burrs are generated near the cut surfaces of the punched first and second sheets 12 and 14, the burrs on the first and second sheets 12 and 14 are formed in opposite directions so as to be away from the bonding surface of the sheets 12 and 14. Thus, short circuits due to burrs are less likely to occur. In other words, as shown in Figure 1(b), the first sheet 12 after punching is supplied onto the die so that the release film faces the punch, so if a burr is formed at the edge of the first sheet 12, that burr will be directed upward (in the opposite direction from the negative electrode layer). Although not shown in Figure 1(b), burrs can also be formed at the edge of the positive electrode layer 124. Furthermore, since the second sheet 14 is supplied onto the die so that the current collector faces the punch and punched out, if a burr is formed at the end of the second sheet 14, that burr will be directed downwards (in the opposite direction from the positive electrode layer). Although not shown in Figure 1(b), burrs can also form at the end of the negative electrode layer 144. Therefore, in the press unit 1, the first sheet 12 is supplied onto the die so that the release film faces the punch and punched out, and the second sheet 14 is supplied onto the die so that the current collector faces the punch and punched out. As a result, even if burrs are formed, these burrs do not shorten the distance between the positive electrode layer and the negative electrode layer at the edges, and short circuits between the positive electrode layer and the negative electrode layer can be effectively suppressed.

[0037] In the press unit 1 according to the first embodiment, as shown in Figures 3A to 3D, the first punch 24 has a different cross-sectional shape and / or cross-sectional size from the second punch 34 in a plane perpendicular to the insertion / removal direction (i.e., a plane parallel to the XY plane). The laminated structure 10 manufactured by the press unit 1 according to the first embodiment includes, for example, a current collector 142, a negative electrode layer 144, an electrolyte layer 16, a positive electrode layer 124, and a release film 12a. In the laminated structure 10, the width (length in the Y direction) of the first sheet 12 is smaller than the width of the second sheet 14. In the laminated structure 10, another layer (more specifically, an insulating layer) can be formed on both sides of the first sheet 12. In this case, the insulation between the first sheet 12 and the second sheet 14 (more specifically, electrical insulation and thermal insulation, etc.) can be further improved.

[0038] Furthermore, in the first embodiment, a laminated structure 10 can be manufactured, which consists of a first sheet 12 and a second sheet 14 having different shapes and / or sizes. Therefore, a laminated structure 10 with a high degree of design freedom can be manufactured, for example, by changing the size and shape of the constituent sheets according to the performance required for the laminate manufactured from the laminated structure 10.

[0039] [Peeling Unit 8] As shown in Figure 6, the peeling unit 8 is (a) A table 84 on which a laminated structure including a release film 12a and a laminate U10 provided on the release film 12a is placed with the release film 12a facing upwards, (b) A tape supply and recovery unit 88 that supplies and recovers a release tape 85 having an adhesive surface onto a table 84, (c) On the table 84, a release section 81 that peels off the release film 12a by bringing the adhesive surface of the release tape 85 into contact with one end of the release film 12a of the laminated structure and then moving the contact section to the other end of the release film 12a of the laminated structure, Includes.

[0040] The tape supply and retrieval unit 88 includes, for example, a tape supply unit 82 and a tape retrieval unit 83. The tape supply unit 82 includes a release tape roll 82b around which the release tape 85 is wound and a supply roller 82a. The tape recovery unit 83 includes a recovery roller 83a and a winding roll 83b for winding up the release tape 85 after it has been peeled off. The peeling unit 81 includes a blade 81a having a curved tip for bringing the adhesive surface of the release tape 85 into contact with one end of the release film 12a of the laminated structure, and then moving the contact portion to the other end of the release film 12a of the laminated structure while it is in contact.

[0041] The table 84 and the release portion 81 are configured such that at least one of them is movable on the table 84, allowing the adhesive surface of the release tape 85 to be brought into contact with one end of the release film 12a of the laminated structure, and then the contact portion to be moved to the other end of the release film 12a of the laminated structure. For example, the table 84 may be fixed and the peeling section 81 may be made movable, the table 84 may be made movable and the peeling section 81 may be fixed, or both the table 84 and the peeling section 81 may be made movable. When both the table 84 and the release section 81 are configured to be movable, for example, the table 84 may be configured to be movable in the vertical direction, and the release section 81 may be configured to be movable in a direction perpendicular to the vertical direction (first direction) (second direction). For example, as shown in Figures 7A to 7C, the release section 81 may be moved forward in the second direction so that the adhesive portion of the release tape 85 aligns with one end of the release film 12a of the laminated structure in a top view (Figure 7A). Then, the table 84 may be raised so that the contact surface of the release tape 85 comes into contact with one end of the release film 12a of the laminated structure (Figure 7B). With the tape in contact, the release section 81 may be moved backward in the second direction to peel off the release film 12a (Figure 7C).

[0042] Furthermore, when moving the peeling unit 81, it is possible to move only the peeling unit 81, or to configure the peeling unit 81 and the tape supply and recovery unit 88 as a single unit and move the peeling unit 81 and the tape supply and recovery unit 88 simultaneously, as shown in Figures 7A to 7C. Furthermore, when moving the peeling unit 81 backward in the second direction with the contact surface of the peeling tape 85 in contact with one end of the release film 12a of the laminated structure, it is preferable that the tape supply and recovery unit 88 supplies and recovers the peeling tape 85 at a speed that is approximately the same as the moving speed of the peeling unit 81.

[0043] The above explanation, as shown in Figures 7A to 7C, describes an example where the release section 81 is equipped with a blade 81a having a curved tip. In this example, as shown in Figure 8A, the release film is peeled off by moving the blade 81a after the adhesive surface of the release tape is brought into contact with one end of the release film by the tip of the blade 81a, thereby moving the contact point toward the other end of the release film. In this case, for example, the tape supply and retrieval unit 88 supplies and retrieves the peeling tape 85 at a speed that is approximately the same as the moving speed of the blade 81a.

[0044] However, instead of the blade 81a, the peeling section 81 may also be equipped with a press roller 81b and a peeling roller 81c, as shown in Figure 8B, each having a central axis parallel to the release film of the laminated structure and perpendicular to the direction of movement. In this case, the release film 12a is peeled off by moving the release roller 81c from one end to the other end after the adhesive surface of the release tape is brought into contact with one end by the press roller 81b, and then the press roller 81b is moved toward the other end.

[0045] Furthermore, in the release section 81 of the laminate manufacturing apparatus for manufacturing a laminate with a substantially rectangular top and bottom surface, as shown in the plan view in Figure 6, it is preferable to position the laminate structure U10 on the table 84 at a 45-degree angle so that the center line of the release tape 85 coincides with the diagonal of the top surface of the laminate structure U10, and then to peel off the release film by bringing the adhesive surface of the release tape into contact with one corner of the release film of the laminate structure and then moving the contact point towards the other corner in the diagonal direction. This method makes it easy to peel off the release film using release tape. Here, the specifications of the release tape, such as its shape (especially its width) and adhesive strength, can be appropriately set considering the structure of the laminated structure U10, particularly the dimensions of the release film such as its width, and the adhesive strength between the release film 12a and the positive electrode layer 124.

[0046] Furthermore, as described above, the punching by the press unit 1 applies force to the edge of the first sheet 12 in a direction that peels off the release film, thereby weakening the adhesive force between the release film and the positive electrode layer. As a result, the release unit 8 can easily peel off the release film, that is, without applying excessive force, thereby preventing damage to the edge of the positive electrode layer.

[0047] [Method for manufacturing laminates] An example of a method for manufacturing the laminate according to the first embodiment will be described below. The method for manufacturing the laminate according to the first embodiment is: (i) A first sheet comprising a first layer including one of the positive electrode layer and the negative electrode layer, and a second layer comprising the other of the positive electrode layer and the negative electrode layer and an electrolyte layer, provided on one of the release film and the current collector; and (ii) a second sheet comprising the other of the first and second layers provided on the other of the release film and the current collector. A pressing process in which a first sheet and a second sheet are supplied onto a die so that the release film and current collector face the punch, punched out by the punch, and the punched first sheet and the punched second sheet are laminated to produce a laminated structure that sequentially includes the release film, the first layer, the electrolyte layer, the other layer, and the current collector, This includes a peeling step for separating the release film from the laminated structure, A laminate is manufactured by removing the release film from the laminated structure. The process of preparing the first and second sheets may be carried out by manufacturing them using the sheet manufacturing apparatus described above, or, for example, by purchasing the first and second sheets.

[0048] The pressing and peeling processes will be explained in more detail below. In the following description, the first sheet 12 and the second sheet 14 will be used as specific examples, but the present invention is not limited to the first sheet 12 and the second sheet 14. Furthermore, the pressing process described below is a specific example using the pressing unit 1 according to the first embodiment, and includes a first sheet punching process, a second sheet punching process, and a lamination process. The pressing process may further include an application process and a conveying process.

[0049] [Pressing process] (First sheet punching process) In the first sheet punching process, the first sheet 12 is punched out by a first punching unit 20, which has a first die 22 provided with a first through hole 222 and a first punch 24 facing the first die 22 and configured to be insertable into and remove from the first through hole 222.

[0050] As shown in Figure 3B, 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 presser 40. When the first punch 24 descends in this way, the first spring compresses in the Z direction, generating a biasing force. Due to this biasing force, the first sheet presser 40 also descends and presses the first sheet 12 against the first die 22. The first sheet presser 40 holds down the first sheet 12 as it is being punched. As a result, the first sheet 12 is held and fixed between the first sheet presser 40 and the first die 22. When the first sheet 12 is punched in this more fixed state by the first sheet presser 40, for example, it is possible to prevent the first sheet 12 from getting caught during punching and to punch out the first sheet 12 while appropriately reflecting the design shape and size. Therefore, the occurrence of misalignment of the first sheet 12 is further suppressed. The first punching section 20 punches out (cuts out) the first sheet 12 toward the bonding surface where the first sheets 12 are joined in the lamination.

[0051] As shown in Figure 3C, the first punch 24 descends further and is inserted through the third through hole 42 and the first through hole 222, so that the first punch 24, together with the first die 22, punches out the first sheet 12 having a predetermined shape. Here, the first sheet 12 is punched out while being held between the first die 22 and the first sheet presser 40 which is positioned opposite the first die 22. In this way, the first punch 24, together with the first die 22, punches out the first sheet 12 which is being transported between its tip surface 242 and the first through hole 222. 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.

[0052] (Second sheet punching process) In the second sheet punching process, the second sheet 14 is punched out by a second punching unit 30, which has a second die 32 provided with a second through hole 322, and a second punch 34 facing the second die 32 and configured to be insertable into and removable from the second through hole 322.

[0053] As shown in Figure 3B, 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 presser 50. When the second punch 34 rises in this way, the second spring compresses in the Z direction, generating a biasing force. Due to this biasing force, the second sheet presser 50 also rises and presses the second sheet 14 against the second die 32. The second sheet presser 50 holds down the second sheet 14 as it is punched out. As a result, the second sheet 14 is sandwiched and fixed between the second sheet presser 50 and the second die 32. When the second sheet 14 is punched out in this more fixed state by the second sheet presser 50, for example, it is possible to prevent the second sheet 14 from getting caught during punching and to punch out the second sheet 14 while appropriately reflecting the design shape and size. Therefore, the occurrence of misalignment of the second sheet 14 is further suppressed. The second punching section 30 punches out the second sheet 14 toward the bonding surface where the first sheet 12 joins in the laminate.

[0054] The second punching section 30 can punch out the second sheet substantially simultaneously with the punching out of the first sheet 12 by the first punching section 20. Therefore, the press unit 1 according to the first embodiment is excellent in terms of mass productivity.

[0055] As shown in Figure 3C, the second punch 34 rises further and is inserted through the fourth through hole 52 and the second through hole 322, thereby punching out the second sheet 14 together with the second die 32. Here, the second sheet 14 is punched out while being held between the second die 32 and the second sheet retaining portion 50 which is positioned opposite the second die 32. In this way, the second punch 34 punches out the second sheet 14, which is being transported 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 rises until its upper surface contacts the lower surface of the first die 22.

[0056] (Lamination process) In the lamination process, the punched-out first sheet 12 is held on the tip surface 242 of the first punch 24, and the first punch 24 is inserted through the first through hole 222, and the punched-out second sheet 14 is held on the tip surface 342 of the second punch 34, and the second punch 34 is inserted through the second through hole 322, thereby laminating the punched-out first sheet 12 and the punched-out second sheet 14.

[0057] The first punch 24 may have a first suction portion 60 on its tip surface 242 for attracting the first sheet 12. When the first punch 24 includes the first suction portion 60, the punched first sheet 12 is held on the tip surface 242 by the first suction portion 60 while being inserted through the first through hole 222. The first punch 24 can further hold the punched first sheet 12 on the tip surface 242 by the first suction portion 60. In this way, when the first punch 24 has the first suction portion 60, it becomes possible to move and laminate the punched first sheet 12 while it is further held 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 laminated structure 10 to be manufactured, the tip surface 242 of the first punch 24 is preferably flush. The tip surface 242 being 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 ends of the tip surface 242 of the first punch 24 are on the same plane.

[0058] The second punch 34 may have a second suction portion on its tip surface 342 for attracting the second sheet 14. When the second punch 34 includes the second suction portion, the punched second sheet 14 is held on the tip surface 342 by the second suction portion (not shown) while being inserted through the second through hole 322. The second punch 34 can further hold the punched second sheet 14 on the tip surface 342 by the second suction portion. In this way, when the second punch 34 has the second suction portion, it becomes possible to move and stack the punched second sheet 14 while it is further held on the second punch 34. Therefore, the occurrence of misalignment of the second sheet 14 is further suppressed.

[0059] Furthermore, after punching out the first sheet 12, the first punch 24 descends through the third through hole 42 of the first sheet holding portion 40 while holding the punched-out first sheet 12 on its tip surface 242. After punching out the second sheet 14, the second punch 34 rises through the fourth through hole 52 of the second sheet holding portion 50 while holding the punched-out second sheet 14 on its tip surface 342. As a result, the first punch 24 and the second punch 34 sandwich the punched-out first and second sheets 12 and 14.

[0060] (Printing process) In the application process, the first punch 24 and the second punch 34 apply heat and / or pressure to the laminated structure 10. Specifically, as shown in Figure 3C, the first die 22 rises and the second die 32 descends so that the first die 22 and the second die 32 are separated (i.e., the laminated structure 10 is detached from the dies 22 and 32), and heat and / or pressure can be applied to the laminated structure 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 laminated structure 10 while the laminated structure 10 is held between the first punch 24 and the second punch 34. In this way, the laminated structure 10 is manufactured. Furthermore, by applying heat and / or pressure (especially by applying pressure) to the laminated structure 10 while it is detached from the first die 22 and the second die 32, even if the laminated structure 10 stretches in the XY plane when the pressure is applied, it is possible to prevent the cut surface of the laminated structure 10 from contacting and deforming the first die 22 and the second die 32. The laminated structure 10 manufactured by the press unit 1 according to the first embodiment is, for example, the laminated structure shown in Figure 1(b). The pressure is, for example, 10 MPa to 100 MPa, or 30 MPa to 70 MPa.

[0061] In the pressure application process, a relatively large pressure, such as 10 MPa to 100 MPa, is applied to the laminated structure 10. Subsequently, as the first punch 24 and the second punch 34 move apart from each other, the laminated structure 10 may stick to the tip surface 242 of the first punch 24 or the tip surface 342 of the second punch 34. To easily remove (discharge) the laminated structure 10 in the subsequent transport process, pressurization can be performed as needed by the first suction section (first intake / exhaust section) 60 and the second suction section (second intake / exhaust section).

[0062] The pressurization process by the first intake / exhaust section 60 will be explained as an example. The second intake / exhaust section is substantially the same as the first intake / exhaust section 60, so its explanation will be omitted. The first intake / exhaust section 60 may further have a pressurizing section (not shown) that communicates with the first suction passage 62. The pressurizing section applies pressure through the communication holes of the porous body 64 placed on the tip surface 242 of the first punch 24 (that is, by creating a pressurized atmosphere near the opening of the communication holes of the porous body 64), thereby peeling the laminated structure 10 that is stuck to the tip surface 242 away from the tip surface 242.

[0063] (Conveying process) In the conveying process, the fabricated laminated structure 10 is conveyed. As shown in Figure 3D, the first punch 24 rises and the second punch 34 descends so as to move away from the laminated structure 10. Here, in order to facilitate the conveying of the fabricated laminated structure 10, the second punch 34 can be positioned so as to protrude from the second sheet holding part 50. The conveying part (not shown) conveys the fabricated laminated structure 10 and removes the scraps of the first and second sheets 12 and 14. The conveying part is, for example, a conveying arm. The first punch 24 and the second punch 34 return to the positions shown in Figure 3A, and new sheets 12 and 14 are conveyed. A new laminated structure 10 is fabricated in the same manner.

[0064] [Peeling process] The peeling process is, The release film is peeled off by first bringing the adhesive side of a release tape, which has an adhesive surface, into contact with one end of the release film of a laminated structure, and then moving the contact portion to the other end of the release film of the laminated structure. For example, as shown in Figures 7A to 7C, the peeling process involves placing the laminated structure 10 on a table 84 with the release film 12a facing upwards, and using the peeling unit 81, bringing the adhesive surface of the peeling tape 85 into contact with one end of the release film 12a of the laminated structure 10, and then moving the contact portion to the other end of the release film 12a of the laminated structure 10 to peel off the release film 12a.

[0065] When peeling off the release film 12a, the alignment of one end of the release film 12a on the laminated structure 10 with the peeling section 81 (left-right alignment), the movement when bringing one end of the release film 12a into contact with the adhesive surface of the release tape 85 (up-down movement), and the movement of the contact area of ​​the laminated structure 10 toward the other end of the release film 12a are performed by moving either or both of the peeling section 81 and the table 84, while appropriately controlling the movement speed, stopping position, and timing. When controlling the movement of either or both of the peeling section 81 and the table 84, it is preferable to simultaneously control the supply speed and the timing of stopping the supply of the release tape 85.

[0066] Furthermore, the pressing force applied when the adhesive surface of the release tape 85 is brought into contact with one end of the release film 12a of the laminated structure 10 by the release section 81, and the pressing force applied when the contact section is moved to the other end of the release film 12a of the laminated structure 10, is preferably set to an optimized pressing force based on the shape and material of the blade 81a and the configuration of the laminated body U10 to be manufactured, so as to suppress the occurrence of damage to the laminated body U10, especially at the edges of the laminated body U10. The optimized pressing force can be set, for example, by referring to a database that stores the optimized pressing force for each type of laminated body U10.

[0067] In a manufacturing method for producing a laminate U10 having a roughly rectangular top and bottom surface, the peeling step preferably involves bringing the adhesive surface of a peeling tape into contact with one corner of the release film of the laminate structure 10 at one end, and then moving the contact point diagonally toward the other corner to peel off the release film. This makes it easy to peel off the release film with the peeling tape.

[0068] The peeling process may involve using a blade to bring its tip into contact with one end of the release film of the laminated structure 10, then moving the blade toward the other end of the release film to peel off the release film. Here, the shape (especially the radius of curvature of the curved surface of the tip) and material of the blade 81a are set to an optimized shape by selecting a preferred material, taking into consideration the shape and material of the release film 12a, the shape and material of the release tape 85, and the adhesive strength between the release film 12a and the release tape 85.

[0069] In the peeling process, the adhesive surface of the release tape may be brought into contact with one end of the release film of the laminated structure 10 using a pressing roller, then the pressing roller is moved toward the other end of the release film of the laminated structure 10, and a separate peeling roller is moved from the one end toward the other end to peel off the release film. Here, the shape (especially the radius of the roller) and material of the pressing roller 81b and the peeling roller 81c are set to an optimized shape by selecting preferred materials, taking into consideration the shape and material of the release film 12a, the shape and material of the release tape 85, and the adhesive strength between the release film 12a and the release tape 85. Furthermore, the height of the peeling roller 81c when peeling off the release film 12a is also set to an optimized height, taking into consideration the shape and material of the release film 12a, the shape and material of the release tape 85, and the adhesive strength between the release film 12a and the release tape 85.

[0070] <Second Embodiment> The laminate manufacturing apparatus according to the second embodiment will be described with reference to Figures 9A to 9D. Figures 9A to 9D are cross-sectional views of the press unit according to the second embodiment. The laminate manufacturing apparatus of the second embodiment differs from that of the first embodiment in the structure of the press unit. Specifically, the cross-sectional shape and / or cross-sectional size of the first punch is the same as that of the second punch. The following will mainly describe the configurations that differ from the first embodiment. Note that in the second embodiment, reference numerals that are the same as those in the first embodiment will not be described because they have the same configuration as in the first embodiment.

[0071] In the press unit 1A according to the second embodiment, as shown in Figures 9A to 9D, the first punch 24A has the same cross-sectional shape and / or cross-sectional size as the second punch 34 in a plane perpendicular to the insertion / removal direction (i.e., a plane parallel to the XY plane). The laminated structure 10A manufactured by the press unit 1A according to the second embodiment is, for example, the laminated structure shown in Figure 10(a). In the laminated structure 10A, the width (length in the Y direction) of the first sheet 12 and the width of the second sheet 14 are the same.

[0072] In the second embodiment, a laminated structure 10A can be manufactured, which consists of a first sheet 12 and a second sheet 14 of the same size. Therefore, for example, a smaller laminate can be manufactured compared to the laminate U10 of the first embodiment. However, compared to the laminate U10 of the first embodiment, the distance between the positive electrode layer 124 and the negative electrode layer 144 on the side becomes shorter, raising concerns that short circuits may occur more easily. However, according to the press unit 1A of the second embodiment, it is possible to manufacture a laminate that can effectively suppress short circuits.

[0073] This point will be explained in detail with reference to Figure 10. Figure 10(a) is an enlarged cross-sectional view of the vicinity of the cut surface of a laminated structure 10A manufactured with the press unit 1A according to the second embodiment. Figure 10(b) is an enlarged cross-sectional view of the vicinity of the cut surface of a laminated structure 10A manufactured with the apparatus of the comparative example. In the press unit 1A according to the second embodiment, the first sheet 12 is punched out from the top to the bottom along the Z direction by the first punching unit 20, which includes a first punch 24 and a first die 22. As a result, burrs facing upward may be generated near the cut surface of the positive electrode layer 124 in the laminated structure 10A manufactured with the press unit 1A according to the second embodiment, as shown in Figure 10(a). In contrast, the second sheet 14 is punched out from the bottom to the top along the Z direction by the second punching unit 30, which includes a second punch 34 and a second die 32. Therefore, in the laminated structure 10A manufactured by the press unit 1A according to the second embodiment, burrs facing downwards may be generated near the cut surfaces of the negative electrode layer 144 and the electrolyte layer 16. Furthermore, since the laminated structure 10A is constructed by laminating the positive electrode layer 124 of the electrolyte layer 16 first sheet 12 on the negative electrode layer 144, the burrs are formed in opposite directions so as to be away from the bonding surface of the sheets.

[0074] In such a laminated structure 10A, the positive electrode layer 124 and the negative electrode layer 144 are separated by a distance L equal to at least the thickness of the electrolyte layer 16, so, for example, short circuits between the positive electrode layer 124 and the negative electrode layer 144 are suppressed.

[0075] In contrast, in a comparative example where, for example, the first and second sheets 12 and 14 are laminated and then punched out all at once, burrs oriented in the same direction may be generated near the cut surface of the manufactured laminated structure, as shown in Figure 10(b). As a result, the distance between the positive electrode layer 124 and the negative electrode layer 144 may be smaller than the distance L corresponding to the thickness of the electrolyte layer 16, resulting in a distance L'. In such a case, the electrical resistance decreases at the location of distance L', which can lead to a short circuit.

[0076] Furthermore, in this second embodiment, the first sheet 12 and the second sheet 14 are not punched out together in a stacked state, but rather the first sheet 12 and the second sheet 14 are punched out individually by the first punching section 20 and the second punching section 30, respectively.

[0077] More specifically, the first punch 24 and the first die 22 punch out the first sheet 12 without contacting 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 of the first sheet 12 (for example, powder material such as active material) adhere to the first punch 24 and the first die 22 as a result of punching out the first sheet 12, these components are unlikely to adhere to the cut surface of the second sheet 14.

[0078] Similarly, the second punch 34 and the second die 32 punch out the second sheet 14 without contacting 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 of the second sheet 14 (for example, powder material such as active material) adhere to the second punch 34 and the second die 32 as a result of punching out the second sheet 14, these components are unlikely to adhere to the cut surface of the first sheet 12.

[0079] Thus, in this embodiment, since the first sheet 12 and the second sheet 14 are punched out individually, material flow by the punching parts 20, 30 (specifically, the punches 24, 34 and dies 22, 32) is less likely to occur at the cut surface of the laminated structure 10, and as a result, the occurrence of short circuits due to components constituting the sheets adhering to the cut surface is suppressed.

[0080] In contrast, in a comparative example where the first and second sheets 12 and 14 are stacked and then punched out all at once, as shown in Figure 10(b), the first sheet 12 is punched out first, followed by the second sheet 14. That is, the punch punches out the first sheet 12 first, and then the second sheet 14. As a result, the components of the first sheet 12 adhere to the punch after the first sheet 12 is punched out, and then the second sheet 14 is punched out. Consequently, the components of the first sheet 12 are likely to adhere to the cut surface of the second sheet 14 after punching. Therefore, material flow by the punch and die is likely to occur, and as a result, short circuits are likely to occur in the comparative example. Furthermore, if the laminate is punched out all at once with a conductive punch, the potential difference between the first sheet 12 and the second sheet 14 can cause the punch to short-circuit.

[0081] Furthermore, if the sheets 12 and 14 within the laminated structure 10 are misaligned, short circuits are more likely to occur. For example, if the misalignment prevents a portion of the negative electrode (more specifically, graphite) from being directly opposite a portion of the positive electrode (more specifically, lithium) at a given position, metal ions (more specifically, lithium ions) that have moved from the positive electrode will have nowhere to go during the charging of the secondary battery. As a result, the metal ions will grow in a dendritic manner at that portion of the negative electrode, making dendrite formation more likely. In this case, the formation of dendrites at the negative electrode will proceed toward the positive electrode, making short circuits more likely to occur.

[0082] Generally, precise alignment requires image processing, which takes a certain amount of time and reduces mass productivity. Considering these factors, the inventors focused on the fact that by performing punching and lamination in a single process, it is possible to manufacture a laminated structure 10A that accurately reflects the design without the need to align the punched sheets 12, 14, and 16. Based on this technical knowledge, after the punches 24 and 34 punch out the sheets 12 and 14, the punched sheets are placed on the leading edges 242 and 342, and the sheets 12, 14, and 16 are laminated by inserting them through the through holes 222 and 322 of the dies 22 and 322.

[0083] Furthermore, for example, the generation of burrs can cause the distance between the first sheet 12 and the second sheet 14 to become uneven, resulting in the material constituting the first sheet 12 being utilized unevenly. As a result, the functionality of the laminate may deteriorate (more specifically, the electrode capacitance may decrease, leading to electrode damage). Furthermore, if the laminate is punched out all at once by smoothing the end face (cut surface) formed by punching, components from sheets 12 and 14 are likely to be mixed into other sheets 12 and 14. Such foreign matter contamination is, for example, the mixing of positive electrode active material into the negative electrode active material layer. As a result, if a laminate is made from the comparative example laminate structure 10, the battery function may be reduced.

[0084] In this second 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 contamination is less likely to occur. Therefore, in addition to the effect of sufficiently suppressing the occurrence of short circuits, this second embodiment may have the secondary effect of making these problems less likely to occur.

[0085] The first and second sheets 12 and 14 may contain 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, polysulfurized rubber, acrylonitrile-butadiene rubber, polyvinyl fluoride, polyvinylidene fluoride (PVDF), fluororubber, and polyalkylene carbonate. Polyalkylene carbonate is, for example, formulated as follows: -(-C(=O)-ORO-)- [In the formula, R represents an alkylene group having 1 to 20 carbon atoms.] It contains repeating units represented by . The alkylene group having 1 to 20 carbon atoms may be linear or branched, and a part of it may be cyclic.

[0086] <Other Embodiments> This disclosure is not limited to the embodiments described above, and design modifications are possible without departing from the gist of this disclosure. For example, the following modifications are possible.

[0087] In the first and second embodiments, the press unit was a sheet-fed device in which the cut first and second sheets 12 and 14 were intermittently conveyed to the first and second punching sections 20 and 30, but it is not limited thereto. For example, the press unit may be a roll-to-roll device in which the first and second sheets 12 and 14 were continuously conveyed to the first and second punching sections 20 and 30.

[0088] In the first and second embodiments, the press unit was equipped with first and second sheet pressing sections 40 and 50, but is not limited thereto. The press unit 1 may be equipped with either the first or second sheet pressing section 40 or 50.

[0089] In the first and second embodiments, the press unit was provided with a first die 22 and a second die 32 in a separate state, but is not limited thereto. The first die 22 and the second die 32 may, for example, be an integrated third die 70. The differences of this modified example from the second embodiment (having a third die 70 in which the first die 22 and the second die 32 are integrated) will be explained with reference to Figures 11A to 11D. Note that in this modified example, reference numerals that are the same as those in the second embodiment have the same configuration as in the second embodiment, so their explanation will be omitted.

[0090] [Press unit related to modification] In the modified press unit 1B, the first punching section 20B and the second punching section 30B have a third die 70 in which the first die 22 and the second die 32 are integrated. The third die 70 has a fifth through hole 72 through which the first punch 24 and the second punch 34 are inserted.

[0091] [Manufacturing method for laminates according to modified examples] (First sheet punching process) The third die 70 is fixed, and as shown in Figures 11A to 11D, the first punch 24 descends so as to approach the fixed third die 70. The first sheet 12 is punched out while being held between the third die 70 and the first sheet retaining portion 40.

[0092] (Second sheet punching process) As shown in Figures 11A to 11D, the second punch 34 rises so as to approach the fixed third die 70. The second sheet 14 is punched out while being held between the third die 70 and the second sheet retaining portion 50.

[0093] (Lamination process) The punched-out first sheet 12 is held by the tip surface 242 of the first punch 24 and is guided to move through the fifth through hole 72 of the third die 70. The punched-out second sheet 14 is held by the tip surface 342 of the second punch 34 and is guided to move through the fifth through hole 72 of the third die 70. The first punch 24 and the second punch 34 stack the punched-out first sheet 12 and the punched-out second sheet 14.

[0094] In the above modified example, the press unit 1B punched out the first sheet 12 and the second sheet 14 substantially simultaneously, but is not limited to this. For example, the first sheet 12 and the second sheet 14 may be punched out at different times. An example of punching out multiple sheets at different times is to punch out the first sheet 12 first, and then the second sheet 14. Of course, the punching order may also be reversed.

[0095] Referring to Figures 12A to 12D, another modification of the second embodiment will be explained, highlighting the differences (non-simultaneous punching of the first sheet 12 and the second sheet 14). Figures 12A to 12D are cross-sectional views of the press unit 1C according to another modification of the second embodiment. Note that in this other modification of the second embodiment, the same reference numerals as those in the above modification of the second embodiment have the same configuration as those in the above modification of the first embodiment, and therefore their explanation will be omitted.

[0096] [Press Unit] The press unit 1C, which is another modified example of the second embodiment, has substantially the same structure as the press unit 1B, which is the modified example of the second embodiment. The only difference is the control unit (not shown) that controls the operation of the first punching section 20B and the second punching section 30B, respectively.

[0097] [Method for manufacturing laminates] (First sheet punching process and second sheet punching process) As shown in Figures 12A to 12D, the first sheet 12 is punched out first by the first punching section 20B, and then the second sheet 14 is punched out by the second punching section 30B. In this way, the laminated structure 10 is manufactured.

[0098] In the first and second embodiments, the first and second punches 24 and 34 of the press unit all had suction sections, but this is not limited to them. Any of the first and second punches 24 and 34 of the press unit 1 may have a suction section.

[0099] In the first and second embodiments, the first die 22 and the second die 32 were movable, but are not limited thereto. For example, the first die 22 and the second die 32 may be fixed.

[0100] In the first and second embodiments, nothing is placed between the first die 22 and the second die 32, but a plate may be further placed between the first die 22 and the second die 32, with the top and bottom being respectively. In this way, the press unit may have a three-tiered structure.

[0101] In the first and second embodiments, the first and second punches 24 and 34 of the press unit all had the same type of suction portion, but this is not limited to them. For example, one of the first and second punches 24 and 34 of the press unit 1 may have the suction portion of the first embodiment, and the other may have the suction portion of the second embodiment.

[0102] The laminate manufacturing apparatus and method for manufacturing a laminate described herein include the following embodiments. Appearance 1. A press unit that produces a laminated structure comprising: a first sheet having a first layer including one of a positive electrode layer and a negative electrode layer, and a second sheet having one of the positive electrode layer and the other of the negative electrode layer and an electrolyte layer, provided on one of a release film and a current collector; and a second sheet having the other of the first and second layers provided on the other of a release film and a current collector, supplied onto a die such that the release film and the current collector face a punch, punching out the first sheet and the second sheet respectively with the punch, and laminating the punched first sheet and the punched second sheet to produce a laminated structure comprising the release film, the one layer, the electrolyte layer, the other layer and the current collector in that order, A release unit for separating the release film from the laminated structure, Includes, A laminate manufacturing apparatus for producing a laminate obtained by removing the release film from the aforementioned laminated structure.

[0103] Appearance 2 The aforementioned press unit is The device comprises a first punching section for punching out the first sheet, and a second punching section positioned opposite the first punching section for punching out the second sheet, The first punching section comprises a first die provided with a first through hole, and a first punch facing the first die and configured to be insertable into and removable from the first through hole. The first punch punches out the first sheet, which is being transported 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 it with the tip surface. The second punching section comprises a second die that can be integrated with the first die and has a second through hole, and a second punch that faces the second die and is configured to be insertable into and removable from the second through hole. The second punch punches out the second sheet, which is being transported between its tip surface and the second through-hole, together with the second die, and inserts the punched-out second sheet through the second through-hole while holding it with the tip surface. The laminate manufacturing apparatus according to embodiment 1, wherein the first punch and the second punch stack and sandwich the punched first sheet and the punched second sheet.

[0104] Appearance 3 The peeling unit is A table on which the laminated structure is placed with the release film facing upwards, A tape supply and collection unit that supplies and collects release tape having an adhesive surface onto the table, On the aforementioned table, a release unit is used to peel off the release film by bringing the adhesive surface of a release tape into contact with one end of the release film of the laminated structure, and then moving the contact portion to the other end of the release film of the laminated structure. A laminate manufacturing apparatus according to embodiment 1 or 2, which includes the following:

[0105] Pattern 4 A laminate manufacturing apparatus for manufacturing a laminate with a substantially rectangular top and bottom surface, The peeled portion is, The release film is peeled off by bringing the adhesive surface of the release tape into contact with one corner of the release film of the laminated structure, which is one end, and then moving the contact portion toward the other end, which is the other corner in the diagonal direction. The laminate manufacturing apparatus according to Embodiment 3.

[0106] Appearance 5 The peeled portion is, The system includes a blade with a curved tip, and the release film is peeled off by bringing the tip of the blade into contact with the adhesive surface of the release tape at one end, and then moving the blade toward the other end. A laminate manufacturing apparatus according to embodiment 3 or 4.

[0107] Appearance 6 The peeled portion is, Each includes a pressing roller and a peeling roller, each having a central axis parallel to the release film of the laminated structure and perpendicular to the direction of movement, A laminate manufacturing apparatus according to embodiment 3 or 4, wherein the release film is peeled off by moving the release roller toward the other end after the adhesive surface of the release tape is brought into contact with one end by the press roller, and then moving the release roller toward the other end.

[0108] Appearance 7 The aforementioned table is configured to be movable in the vertical direction, The peeling portion is configured to be movable in a direction perpendicular to the vertical direction, A laminate manufacturing apparatus according to any one of embodiments 3 to 6, wherein the table is moved upward to bring the adhesive surface of the release tape into contact with one end, and then the release portion is moved toward the other end to peel off the release film of the laminate structure.

[0109] Appearance 8 The first sheet comprises a first layer including the positive electrode layer, which is provided on the release film. The second sheet is provided on the current collector with a second layer including the negative electrode layer and the electrolyte layer. A laminate manufacturing apparatus according to any one of embodiments 3 to 7.

[0110] Appearance 9 The device further comprises a sheet-holding portion located on at least one of the sides facing the first die and the second die, The laminate manufacturing apparatus according to any of embodiments 2 and 3 to 8 that reference embodiment 2, wherein the sheet pressing portion holds down the first sheet or the second sheet that is to be punched out.

[0111] Appearance 10 A laminate manufacturing apparatus according to embodiment 2 and any of embodiments 3 to 8 referencing embodiment 2, further comprising a suction portion for sucking up the first sheet or the second sheet on at least one of the tip surfaces of the first punch and the second punch.

[0112] Appearance 11 The suction section is A porous body having interconnected pores, A depressurizing section having a suction passage that communicates with the communication hole and It has, The laminate manufacturing apparatus according to embodiment 10, wherein the main surface of the porous body constitutes a part of the tip surface.

[0113] Appearance 12 The suction section is When the aforementioned tip surface is viewed from above, an insert is fitted in such a way that a slit-shaped opening is formed on its outer edge, A pressure reducing section having a suction passage communicating with the aforementioned slit-shaped opening It has, The laminate manufacturing apparatus according to embodiment 10 or 11, wherein the main surface of the insert constitutes a part of the tip surface.

[0114] Appearance 13 A laminate manufacturing apparatus according to Embodiment 2 and any of Embodiments 3 to 12 referencing Embodiment 2, wherein in a plane perpendicular to the insertion and removal direction, the first punch has a different cross-sectional shape and / or cross-sectional size from that of the second punch.

[0115] Appearance 14 A laminate manufacturing apparatus according to Embodiment 2 and any of Embodiments 3 to 12 referencing Embodiment 2, wherein a third sheet having a predetermined shape is fixed by the first die, the second die, or the third die which is an integrated first die and second die, and the first sheet and the second sheet are laminated together via the third sheet to manufacture the laminate.

[0116] Appearance 15 A step of preparing a first sheet in which one of the following is provided on one of the release film and current collector: a first layer including one of the positive electrode layer and the negative electrode layer and a second layer including the other of the positive electrode layer and the negative electrode layer and an electrolyte layer; and a second sheet in which the other of the first layer and the second layer is provided on the other of the release film and current collector. A pressing step comprising: supplying the first sheet and the second sheet onto a die so that the release film and the current collector face the punch, punching them out with the punch, and laminating the punched first sheet and the punched second sheet to produce a laminated structure that sequentially includes the release film, one layer, the electrolyte layer, the other layer, and the current collector; The process includes a peeling step of separating the release film from the laminated structure, A method for manufacturing a laminate, wherein a release film is removed from the aforementioned laminated structure.

[0117] Appearance 16 The aforementioned peeling step is The release tape having an adhesive surface is brought into contact with one end of the release film of the laminated structure, and then the contact portion is moved to the other end of the release film of the laminated structure to peel off the release film. A method for manufacturing a laminate according to embodiment 15.

[0118] Appearance 17 A method for manufacturing a laminate in which the top and bottom surfaces are substantially rectangular, The aforementioned peeling step is The release film is peeled off by bringing the adhesive surface of the release tape into contact with one corner of the release film of the laminated structure, which is one end, and then moving the contact portion toward the other end, which is the other corner in the diagonal direction. A method for manufacturing a laminate according to embodiment 15 or 16.

[0119] Appearance 18 The aforementioned peeling step is A method for manufacturing a laminate according to any one of embodiments 15 to 17, wherein the release film is peeled off by bringing the tip of the blade into contact with the adhesive surface of the release tape at one end, and then moving the blade toward the other end.

[0120] Appearance 19 The aforementioned peeling step is A method for manufacturing a laminate according to any one of embodiments 15 to 17, wherein the adhesive surface of the release tape is brought into contact with one end by a pressing roller, the pressing roller is moved toward the other end, and the release film is peeled off by moving the release roller from one end toward the other end.

[0121] Appearance 20 The first sheet comprises a first layer including the positive electrode layer, which is provided on the release film. The second sheet is provided on the current collector with a second layer including the negative electrode layer and the electrolyte layer. A method for manufacturing a laminate according to any one of embodiments 15 to 19.

[0122] Appearance 21 The aforementioned pressing process is A first sheet punching step involves punching out a first sheet using a first punching unit having a first die provided with a first through-hole and a first punch facing the first die and configured to be insertable into and removable from the first through-hole, A second sheet punching step is performed by punching out a second sheet using a second punching section, which is positioned opposite the first punching section, and which includes a second die that can be integrated with the first die and has a second through-hole, and a second punch that faces the second die and is configured to be insertable into and removable from the second through-hole, A lamination step of stacking 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, A method for manufacturing a laminate according to any one of embodiments 15 to 19, comprising the above.

[0123] Appearance 22 In the first sheet punching process, the first sheet is punched out while being held between the first die and the first sheet pressing portion positioned opposite the first die, and / or The method for manufacturing a laminate according to embodiment 21, wherein in the second sheet punching step, the second sheet is punched out while being held between the second die and a second sheet pressing portion positioned opposite the second die.

[0124] Appearance 23 A method for manufacturing a laminate according to embodiment 21 or 22, wherein in the lamination step, the first punch passes through a first through hole while the first suction portion of the first punch holds the first sheet punched out on the tip surface of the first punch, and / or the second punch passes through a second through hole while the second suction portion of the second punch holds the second sheet punched out on the tip surface of the second punch.

[0125] Pattern 24 A method for manufacturing a laminate according to any one of embodiments 21 and embodiments 22 to 23 referencing embodiment 21, wherein in the first sheet punching step and the second sheet punching step, the first sheet and the second sheet are punched out with the third sheet provided on at least one of the first sheet and the second sheet.

[0126] Appearance 25 A method for manufacturing a laminate according to any one of embodiments 21 and embodiments 22 to 24 that reference embodiment 21, wherein in the lamination step, a third sheet that has been formed in advance into a predetermined shape is laminated between the punched-out first sheet and the punched-out second sheet. [Explanation of Symbols]

[0127] 1, 1A, 1B, 1C ··· Press Unit 8 ···Peeling Unit 10,10A ···Laminated structure U10 ···Laminate M10 ···Laminate 12 ···First sheet 12a ···Release film 124 ···Positive electrode layer 14 ···Second sheet 142 ···Current collector 144 ···Negative electrode layer 16...electrolyte layer 20,20A,20B...1st punching section 22,22A ···First die 222 ···First through hole 24,24A ···First punch 242 ···Tip surface of the first punch 30,30B...2nd punching section 32 ···Second Die 322...Second through hole 34 ···Second punch 342 ···Tip surface of the second punch 40, 40A ···First sheet retaining section 42 ···Third through hole of the first sheet retaining section 50 ···Second sheet retaining section 52 ···Fourth through hole in the second sheet retaining section 60,60A...1st suction part 62,62A...1st suction path 63 ...Neriko 64...Porous material 66 ···Slit-shaped opening 70 ···3rd die 72 ···Fifth through hole 74 ···Seat fixing part 81 Peeled section 81a Blade 81b Pressing roller 81c peeling roller 82 ···Tape supply unit 82a ···Supply roller 82b ···Release Tape Roll 83...Tape Retrieval Department 83a Recovery Roller 83b Winding Roll 84 ···Table 75 ···Sheet manufacturing equipment 88...Tape Supply and Retrieval Department 90 ···Laminated electrode formation cell assembly device 100 ···Punching section 101 ···Sheet Supply Unit 101A First Sheet Roll 101B Second Sheet Roll

Claims

1. A press unit that produces a laminated structure comprising: a first sheet having a first layer including one of a positive electrode layer and a negative electrode layer, and a second sheet having one of the positive electrode layer and the other of the negative electrode layer and an electrolyte layer, provided on one of a release film and a current collector; and a second sheet having the other of the first and second layers provided on the other of a release film and a current collector, supplied onto a die so that the release film and the current collector face a punch, punching out the first sheet and the second sheet respectively with the punch, and stacking the punched first sheet and the punched second sheet to produce a laminated structure comprising the release film, the one layer, the electrolyte layer, the other layer, and the current collector in that order, A release unit for separating the release film from the laminated structure, Includes, A laminate manufacturing apparatus for producing a laminate obtained by removing the release film from the aforementioned laminated structure.

2. The aforementioned press unit is The device comprises a first punching section for punching out the first sheet, and a second punching section positioned opposite the first punching section for punching out the second sheet. The first punching section comprises a first die provided with a first through hole, and a first punch facing the first die and configured to be insertable into and removable from the first through hole. The first punch punches out the first sheet, which is being transported between its tip surface and the first through hole, together with the first die, and inserts the punched-out first sheet through the first through hole while holding it with the tip surface. The second punching section comprises a second die provided with a second through hole, and a second punch facing the second die and configured to be insertable into and removable from the second through hole. The second punch punches out the second sheet, which is being transported between its tip surface and the second through hole, together with the second die, and inserts the punched-out second sheet through the second through hole while holding it with its tip surface. The laminate manufacturing apparatus according to claim 1, wherein the first punch and the second punch stack and sandwich the punched first sheet and the punched second sheet.

3. The peeling unit is A table on which the laminated structure is placed with the release film facing upwards, A tape supply and collection unit that supplies and collects release tape having an adhesive surface onto the table, On the aforementioned table, a release unit is used to peel off the release film by bringing the adhesive surface of a release tape into contact with one end of the release film of the laminated structure, and then moving the contact portion to the other end of the release film of the laminated structure. A laminate manufacturing apparatus according to claim 1 or 2, including the following:

4. A laminate manufacturing apparatus for manufacturing a laminate with a substantially rectangular top and bottom surface, The peeled portion is, The release film is peeled off by bringing the adhesive surface of the release tape into contact with one corner of the release film of the laminated structure, which is one end, and then moving the contact portion toward the other end, which is the other corner in the diagonal direction. The laminate manufacturing apparatus according to claim 3.

5. The peeled portion is, The laminate manufacturing apparatus according to claim 3, comprising a blade having a curved tip, wherein the release film is peeled off by bringing the tip of the blade into contact with the adhesive surface of the release tape at one end, and then moving the blade toward the other end.

6. The peeled portion is, Each includes a pressing roller and a peeling roller, each having a central axis parallel to the release film of the laminated structure and perpendicular to the direction of movement, The laminate manufacturing apparatus according to claim 3, wherein the adhesive surface of the release tape is brought into contact with one end by the pressing roller, the pressing roller is moved toward the other end, and the release film is peeled off by moving the release roller from one end toward the other end.

7. The aforementioned table is configured to be movable in the vertical direction, The peeling portion is configured to be movable in a direction perpendicular to the vertical direction, The laminate manufacturing apparatus according to claim 3, wherein the table is moved upward to bring the adhesive surface of the release tape into contact with one end, and then the release portion is moved toward the other end to peel off the release film of the laminate structure.

8. The first sheet comprises a first layer including the positive electrode layer, which is provided on the release film. The second sheet is provided on the current collector with a second layer including the negative electrode layer and the electrolyte layer. The laminate manufacturing apparatus according to claim 1 or 2.

9. The sheet pressing portion is further provided on at least one of the sides facing the first die and the second die, The laminate manufacturing apparatus according to claim 2, wherein the sheet pressing portion holds down the first sheet or the second sheet that is to be punched out.

10. The laminate manufacturing apparatus according to claim 2, further comprising a suction portion for sucking the first sheet or the second sheet onto at least one of the tip surfaces of the first punch and the second punch.

11. The suction section is A porous body having interconnected pores, A depressurizing section having a suction passage that communicates with the communication hole and It has, The laminate manufacturing apparatus according to claim 10, wherein the main surface of the porous body constitutes a part of the tip surface.

12. The suction section is When the aforementioned tip surface is viewed from above, an insert is fitted in such a way that a slit-shaped opening is formed on its outer edge, A pressure reducing section having a suction passage communicating with the aforementioned slit-shaped opening It has, The laminate manufacturing apparatus according to claim 10, wherein the main surface of the insert constitutes a part of the tip surface.

13. The laminate manufacturing apparatus according to claim 2, wherein the cross-sectional shape and / or cross-sectional size of the first punch perpendicular to the direction in which it can be inserted and / or removed is different from the cross-sectional shape and / or cross-sectional size of the second punch perpendicular to the direction in which it can be inserted and / or removed.

14. The laminate manufacturing apparatus according to claim 2, comprising a third die having a through hole in which the first die and the second die are integrated and the first through hole and the second through hole are continuous, wherein a first sheet punched out by lowering the first punch and a second sheet punched out by raising the second punch are laminated in the through hole of the third die to manufacture the laminate.

15. A step of preparing a first sheet in which one of the following is provided on one of the release film and current collector: a first layer containing one of the positive electrode layer and the negative electrode layer, and a second layer containing the other of the positive electrode layer and the negative electrode layer and an electrolyte layer, and the other of the first layer and the second layer is provided on the other of the release film and current collector; A pressing step comprising: supplying the first sheet and the second sheet onto a die so that the release film and the current collector face the punch, punching them out with the punch, and laminating the punched first sheet and the punched second sheet to produce a laminated structure that sequentially includes the release film, one layer, the electrolyte layer, the other layer, and the current collector; The process includes a peeling step of separating the release film from the laminated structure, A method for manufacturing a laminate, wherein the laminate is obtained by removing the release film from the aforementioned laminated structure.

16. The aforementioned peeling step is The release tape having an adhesive surface is brought into contact with one end of the release film of the laminated structure, and then the contact portion is moved to the other end of the release film of the laminated structure to peel off the release film. A method for manufacturing a laminate according to claim 15.

17. A method for manufacturing a laminate in which the top and bottom surfaces are substantially rectangular, The aforementioned peeling step is The release film is peeled off by bringing the adhesive surface of the release tape into contact with one corner of the release film of the laminated structure, which is one end, and then moving the contact portion toward the other end, which is the other corner in the diagonal direction. A method for manufacturing a laminate according to claim 16.

18. The aforementioned peeling step is A method for manufacturing a laminate according to claim 16, wherein the release film is peeled off by bringing the tip of a blade, which has a curved tip, into contact with the adhesive surface of the release tape at one end, and then moving the blade toward the other end.

19. The aforementioned peeling step is A method for manufacturing a laminate according to claim 16, wherein the adhesive surface of the release tape is brought into contact with one end by a pressing roller, the pressing roller is moved toward the other end, and the release film is peeled off by moving the release roller from one end toward the other end.

20. The first sheet comprises a first layer including the positive electrode layer, which is provided on the release film. The second sheet is provided on the current collector with a second layer including the negative electrode layer and the electrolyte layer. A method for manufacturing a laminate according to claim 15.

21. The aforementioned pressing process is A first sheet punching step involves punching out a first sheet using a first punching unit having a first die provided with a first through-hole and a first punch facing the first die and configured to be insertable into and removable from the first through-hole. A second sheet punching step is performed by punching out a second sheet using a second punching section, which has a second die provided with a second through-hole and a second punch facing the second die and configured to be insertable into and removable from the second through-hole, and is positioned opposite the first punching section. A lamination step in which the punched-out first sheet and the punched-out second sheet are laminated by inserting the first punch into the first through hole while holding the punched-out first sheet with the tip surface of the first punch, and inserting the second punch into the second through hole while holding the punched-out second sheet with the tip surface of the second punch, A method for manufacturing a laminate according to claim 15, comprising the above.

22. In the first sheet punching step, the first sheet is punched out while being held between the first die and the first sheet pressing portion positioned opposite the first die, and / or The method for manufacturing a laminate according to claim 21, wherein in the second sheet punching step, the second sheet is punched out while being held between the second die and a second sheet pressing portion positioned opposite the second die.

23. The method for manufacturing a laminate according to claim 21, wherein in the lamination step, the first punch passes through the first through hole while the first suction portion of the first punch holds the first sheet punched out on the tip surface of the first punch, and / or the second punch passes through the second through hole while the second suction portion of the second punch holds the second sheet punched out on the tip surface of the second punch.

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