Method for manufacturing laminated battery and device for manufacturing laminated battery

Abstract

To provide a method and device for manufacturing a laminated battery capable of detecting the presence / absence of cracks in a protective resin layer in a bent part of a fusion part.SOLUTION: There is provided a method for manufacturing a laminated battery comprising an electrode body and a laminated film. The laminated film has a structure in which at least metal layers 44u, 44d and protective resin layers 42u, 42d are stacked. The laminated film includes a fusion part 40 in which inner surfaces are fused by overlapping ends thereof. The method includes a bending step of bringing a bending member 6 into contact with the fusion part 40 and bending it into an angular or arcuate shape at an angle of 90° or less to form one or more bent parts 40a. The bending member 6 is made of a conductive material. The bending step is the step of performing bending while confirming electrical continuity between the bending member 6 and the metal layers 44u, 44d of the laminated film.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to a method and an apparatus for manufacturing a laminated battery. [Background technology]

[0002] In a laminated battery in which an electrode body is covered with a laminate film, a fused portion is formed by fusing a part of the laminate film to enclose the electrode body, and this fused portion is folded to improve the structural efficiency of the battery.

[0003] For example, Patent Document 1 discloses a method for manufacturing a secondary battery having a folded portion at at least one end in an exterior body that has been subjected to a laminated processing, the method comprising the steps of: abutting a pressure plate against a base point for folding the end of the exterior body; and, after the abutting step, sliding the pressure plate and a pressing plate positioned opposite the pressure plate so as to sandwich the end, bending the end around the base point, and forming a folded portion by clamping the end between the pressure plate and the pressing plate, wherein the surface of the pressing plate that slides against the end has an inclined surface that bends the end and a clamping surface that clamps the end, the inclined surface is inclined so that the cross-sectional area of ​​the pressing plate narrows in the sliding direction in a cross section perpendicular to the width direction of the pressing plate, and the inclined surface is inclined in the width direction. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2019-200973 A Summary of the Invention [Problem to be solved by the invention]

[0005] When forming a bent portion by folding the fused portion of the laminate film at an angle of 90° or less, cracks may occur in the protective resin layer of the laminate film. The occurrence of such cracks may occur in the protective resin layer on the mountain fold side of the bent portion, but is particularly noticeable in the protective resin layer on the valley fold side of the bent portion. Therefore, there is a demand for a manufacturing method and manufacturing device for a laminated battery that can detect the occurrence of cracks in the protective resin layer on the valley fold side and mountain fold side of the bent portion, and thus can remove laminated batteries with cracks in the protective resin layer (i.e., defective laminated batteries) before shipping.

[0006] The present disclosure has been made in consideration of the above-mentioned situation, and aims to provide a manufacturing method and a manufacturing apparatus for a laminated battery that are capable of detecting the occurrence of cracks in the protective resin layer at the bend of the fused portion. [Means for solving the problem]

[0007] <1> A method for manufacturing a laminated battery comprising: an electrode body; and a laminate film that covers and encloses the electrode body, the laminate film having a structure in which at least a metal layer and a protective resin layer are laminated on the outside of the metal layer; and the laminate film has ends that are overlapped with each other and have fused inner surfaces to form a fused portion, a bending step of contacting the fused portion with a bending member and bending the fused portion into an angular or arc shape at an angle of 90° or less to form one or more bent portions, The bending member is made of a conductive material, The method for manufacturing a laminated battery, wherein the folding step is a step of performing folding while checking electrical continuity between the folding member and the metal layer of the laminate film. <2> The folding member is a fulcrum member that is brought into contact with the valley fold side of the bent portion of the laminate film as a fulcrum. <1> A method for producing the laminated battery according to claim 1. <3> The folding step is a step in which a folding roll is disposed as the folding member, and the folding roll is brought into contact with the fused portion of the laminate film while moving the laminated-type battery in a direction corresponding to the rotation of the folding roll to form the bent portion. <1> or <2> A method for producing the laminated battery according to claim 1. <4> The folding step is a step in which a plurality of folding rolls are arranged in a moving direction of the laminated battery, the plurality of folding rolls are sequentially brought into contact with the fused portion of the laminate film while moving the laminated battery to form the bent portion, and folding is performed while checking electrical continuity between at least the folding roll that comes into contact with the bent portion last and the metal layer of the laminate film. <3> A method for producing the laminated battery according to claim 1. <5> An apparatus for manufacturing a laminated battery, comprising: an electrode body; and a laminate film that covers and encloses the electrode body, the laminate film having a structure in which at least a metal layer and a protective resin layer are laminated on the outside of the metal layer, and the laminate film has ends that are overlapped with each other and have fused inner surfaces to form a fused portion, A bending member made of a conductive material that comes into contact with the fused portion and bends the fused portion into an angular or arc shape at an angle of 90° or less to form a bent portion; a conductive confirmation means connected to the bending member and the metal layer of the laminate film for confirming the conductive property between the bending member and the metal layer. Effect of the Invention

[0008] According to the present disclosure, it is possible to provide a manufacturing method and a manufacturing apparatus for a laminated battery that are capable of detecting the occurrence of cracks in a protective resin layer at a bent portion of a fused portion. [Brief description of the drawings]

[0009] [Figure 1]1 is a schematic cross-sectional view illustrating a laminated battery manufactured by a manufacturing method and manufacturing apparatus for a laminated battery according to an embodiment of the present invention. [Diagram 2] 4 is a schematic cross-sectional view illustrating a folding step for forming a bent portion in the manufacturing method for a laminated battery according to the present embodiment, and a manufacturing device for a laminated battery for forming the bent portion. FIG. [Diagram 3] 3 is a schematic cross-sectional view illustrating a state in which a crack has occurred in the protective resin layer in FIG. 2. FIG. [Figure 4] FIG. 1 is a schematic cross-sectional view showing an example of a solid-state battery. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] <Laminated battery manufacturing method and manufacturing device> A manufacturing method for a laminated battery according to an embodiment of the present disclosure is a manufacturing method for manufacturing a laminated battery having an electrode body and a laminate film that covers the electrode body and encloses it inside, the laminate film having a structure in which at least a metal layer and a protective resin layer are laminated on the outside of the metal layer, and the laminate film has a fused portion where the ends are overlapped and the inner surfaces are fused together. The manufacturing method of the laminated battery includes a bending step in which a bending member is brought into contact with the fused portion and the fused portion is bent into an angular or arc shape at an angle of 90° or less to form one or more bent portions. The bending member is made of a conductive material. In the bending step, the folding is performed while checking the electrical continuity between the bending member and the metal layer of the laminate film.

[0011] A manufacturing apparatus for a laminated battery according to an embodiment of the present disclosure is an apparatus for manufacturing a laminated battery, the battery having an electrode body and a laminate film that covers the electrode body and encloses it inside, the laminate film having a structure in which at least a metal layer and a protective resin layer are laminated on the outside of the metal layer, and the ends of the laminate film are overlapped and fused on the inner surface to form a fused portion. The laminated battery manufacturing apparatus includes a bending member made of a conductive material that contacts the fused portion and bends it into an angular or arc shape at an angle of 90° or less to form a bent portion, and a continuity confirmation means that is connected to the bending member and the metal layer of the laminate film and confirms the continuity between the bending member and the metal layer.

[0012] Hereinafter, an embodiment of a manufacturing method and manufacturing apparatus for a laminated battery according to the present disclosure will be described with reference to the drawings. The drawings shown below are schematic diagrams, and the size and shape of each part are appropriately exaggerated to make them easier to understand.

[0013] FIG. 1 is a schematic cross-sectional view illustrating a laminated battery manufactured by the manufacturing method and manufacturing apparatus for a laminated battery according to this embodiment. The laminated battery 10 shown in Fig. 1 has an electrode body 2 and a laminate film 4 that covers and encloses the electrode body 2. The laminate film 4 has ends that are overlapped and fused on the inner surface to form a fused portion 40. The fused portion 40 has a bent portion 40a that is bent into an angular or arc shape at an angle of 90° or less.

[0014] Here, the bending step for forming the bent portion 40a and a laminated battery manufacturing apparatus for forming the bent portion 40a will be described with reference to FIG. 2, the ends of the laminate film 4 are overlapped and the inner surfaces are fused, that is, one end 4u and the other end 4d of the laminate film 4 are overlapped. Each of the one end 4u and the other end 4d of the laminate film 4 has a three-layer structure in which metal layers 44u, 44d, protective resin layers 42u, 42d are laminated on the outside of the metal layers 44u, 44d, and fusion resin layers 46u, 46d are laminated on the inside of the metal layers 44u, 44d.

[0015] In FIG. 2, the folding roll 6 as a folding member is in contact with the protective resin layer 42u on one end 4u side of the laminate film 4 in the fusion portion 40, and the folding roll 6 is used as a fulcrum to bend the laminate film 4 at an angle of 90° or less to form the bending portion 40a. That is, the folding roll 6 is a fulcrum member that is brought into contact with the valley fold side of the bending portion 40a as a fulcrum. The folding roll 6 rotates in a direction in which the contact point with the laminate film 4 faces the front side in FIG. 2. The laminated battery having the fusion portion 40 moves in a direction corresponding to the rotation of the folding roll 6, that is, in a direction facing the front side in FIG. 2, and the folding roll 6 is brought into contact with the moving fusion portion 40 to form the bending portion 40a. Although not shown, an opposing member (e.g., an opposing roll) as a folding member may also be brought into contact with the mountain fold side of the bending portion 40a (the lower side of the fusion portion 40 in FIG. 2).

[0016] 2 has an ammeter 8 as a continuity checking means. The ammeter 8 is connected to the folding roll 6 as a folding member and to the metal layer 44u on one end 4u side of the laminate film 4 by conductors 82, 84. Note that the metal layer 44u on one end 4u side of the laminate film 4 is partly exposed in order to be connected to the conductor 82.

[0017] Here, a conventional manufacturing method and manufacturing apparatus for a laminated battery will be described. When the fused portion of the laminate film is folded at an angle of 90° or less to form a bent portion, cracks sometimes occur in the protective resin layer of the laminate film. It is believed that these cracks occur due to stress concentration at the bent portion of the protective resin layer caused by folding. The occurrence of these cracks can occur in the protective resin layer on the mountain fold side of the bent portion, but is particularly noticeable in the protective resin layer on the valley fold side of the bent portion. It is believed that this is because stress is more likely to concentrate on the valley fold side, and because the folding member is pressed against it, cracks are more likely to occur starting from the contact point. Furthermore, if a crack occurs in the protective resin layer on the valley fold side of a bend, it becomes difficult to determine whether or not there is a crack, and the shallower the fold angle in the bend (i.e., the more acute the angle), the more difficult it becomes to determine whether or not there is a crack. However, in laminate films, which are thin films, it is difficult to find cracks using non-destructive testing such as X-ray testing. Therefore, there has been a demand for a manufacturing method and manufacturing apparatus for a laminated battery that is capable of detecting the occurrence of cracks in the protective resin layer on the valley fold side and the mountain fold side of a bent portion.

[0018] In contrast, in this embodiment, as shown in FIG. 2, an ammeter 8 is provided as a continuity confirmation means connected to the folding roll 6 and the metal layer 44u, which are folding members, and confirms the continuity between the folding roll 6 and the metal layer 44u. Then, folding is performed while confirming the continuity between the folding roll 6 and the metal layer 44u with the ammeter 8. In a state where no cracks are generated in the protective resin layer 42u on the first 4u side of the laminate film 4 (i.e., the state shown in FIG. 2), the folding roll 6 and the metal layer 44u are not in contact with each other, and no electrical continuity is confirmed. However, when a crack 420 is generated in the protective resin layer 42u on the first 4u side of the laminate film 4 and the folding roll 6 and the metal layer 44u are in contact with each other as shown in FIG. 3, electrical continuity is confirmed by the ammeter 8. As a result, in this embodiment, electrical continuity is confirmed when a tear is generated in the protective resin layer, so that it is possible to confirm the presence or absence of a tear in the protective resin layer in the laminate film of the laminated type battery to be manufactured. As a result, laminated batteries with cracks in the protective resin layer (that is, defective laminated batteries) can be removed before shipping.

[0019] In FIG. 2, the folding roll 6 as a folding member connected to the ammeter 8 as the continuity checking means is shown as a fulcrum member that is brought into contact with the valley fold side of the bent portion 40a of the fused portion 40 as a fulcrum. However, the present invention is not limited to this, and the folding member (e.g., folding roll) connected to the continuity checking means may be brought into contact with the mountain fold side of the bent portion of the fused portion. In this case, the presence or absence of cracks occurring in the protective resin layer on the mountain fold side of the bent portion of the fused portion can be detected. In addition, the folding member (e.g., folding roll) connected to the continuity checking means may be brought into contact with both the valley fold side and the mountain fold side of the bent portion of the fused portion. In this case, the presence or absence of cracks occurring in the protective resin layer on the mountain fold side and the protective resin layer on the valley fold side of the bent portion of the fused portion can be detected.

[0020] In the embodiment of the present disclosure, a plurality of folding rolls may be arranged in the moving direction of the laminated battery, and a bending portion may be formed by sequentially bringing a plurality of folding rolls into contact with the fused portion of the laminate film while moving the laminated battery. In this case, it is preferable to perform folding while checking the conduction between at least the folding roll that will lastly contact the bending portion and the metal layer of the laminate film. By checking the conduction between the folding roll that will lastly contact the bending portion and the metal layer of the laminate film, it is also possible to detect cracks that have occurred before the folding roll contacts the bending portion.

[0021] The number of bent portions in the fusion portion is one or more, and may be two or more. The angle of the bent portion of the fusion portion may be 90° or less, may be an angle more acute than 90°, or may be 0° (i.e., the fusion portion is bent 180°). The bent portion has an angular or arc-shaped bent shape. An angular shape means a shape having an angle, and an arc-shaped shape means a curved shape having no angle.

[0022] Although a folding roll is shown in FIG. 2 as the folding member, the present invention is not limited thereto. For example, the folding member may be a plate-shaped member that serves as a fulcrum member that is in contact with the valley fold side of the bending portion and a block-shaped pressing member that is in contact with the mountain fold side of the bending portion, thereby folding the bending portion. At least a part of the folding member is made of a conductive material. Specifically, at least a part of the folding member is made of a conductive material so that the part that contacts the protective resin layer of the fusion portion (i.e., the part that contacts the metal layer inside the protective resin layer when a crack occurs in the protective resin layer) and the part that is connected to the conduction confirmation means are electrically connected. The folding member may be made of a conductive material as a whole. An example of the conductive material is metal.

[0023] Although an ammeter is shown in FIG. 2 as the continuity checking means, the means is not limited to this and may be any means capable of checking electrical continuity, such as a voltmeter or a resistance measuring instrument.

[0024] (Battery components) Next, the electrode body and laminate film constituting the laminate battery manufactured by the manufacturing method and manufacturing apparatus for the laminate battery according to this embodiment will be described.

[0025] (1) Laminate film The laminate film has a structure in which at least a metal layer and a protective resin layer are laminated on the outer side of the metal layer. The laminate film may have a three-layer structure further including a fusion resin layer on the inner side of the metal layer.

[0026] Examples of materials for the fusion resin layer include olefin resins such as polypropylene (PP) and polyethylene (PE). Examples of materials for the metal layer include aluminum, aluminum alloys, and stainless steel. Examples of materials for the protective resin layer include polyethylene terephthalate (PET) and nylon. The thickness of the fusion resin layer is, for example, 40 μm or more and 100 μm or less. The thickness of the metal layer is, for example, 30 μm or more and 60 μm or less. The thickness of the protective resin layer is, for example, 20 μm or more and 60 μm or less. The thickness of the entire laminate film is, for example, 70 μm or more and 220 μm or less.

[0027] (2) Electrode body The electrode assembly functions as a power generating element of the battery. The electrode assembly usually has a positive electrode current collector, a positive electrode active material layer, an electrolyte layer, a negative electrode active material layer, and a negative electrode current collector, in this order in the thickness direction.

[0028] The positive electrode active material layer contains at least a positive electrode active material. The positive electrode active material layer may further contain at least one of a conductive material, an electrolyte, and a binder. The positive electrode active material is, for example, in the form of particles. Examples of the positive electrode active material include oxide active materials. Sulfur (S) may also be used as the positive electrode active material.

[0029] The positive electrode active material preferably contains a lithium composite oxide. The lithium composite oxide may contain at least one selected from the group consisting of F, Cl, N, S, Br, and I. The lithium composite oxide may have a crystal structure belonging to at least one space group selected from the space groups R-3m, Immm, and P63-mmc (also called P63mc or P6 / mmc). The lithium composite oxide may have an O2 type structure in which the transition metal, oxygen, and lithium are mainly arranged.

[0030] Examples of lithium composite oxides having a crystal structure belonging to R-3m include Li x Me y O α X β(Me represents at least one selected from the group consisting of Mn, Co, Ni, Fe, Al, Cu, V, Nb, Mo, Ti, Cr, Zr, Zn, Na, K, Ca, Mg, Pt, Au, Ag, Ru, W, B, Si, and P, and X represents at least one selected from the group consisting of F, Cl, N, S, Br, and I, and satisfies 0.5≦x≦1.5, 0.5≦y≦1.0, 1≦α<2, and 0<β≦1.)

[0031] Examples of lithium composite oxides having a crystal structure belonging to Immm include Li x1 M 1 A 1 2(1.5≦x1≦2.3, M 1 contains at least one selected from the group consisting of Ni, Co, Mn, Cu and Fe, and A 1 contains at least oxygen, and A 1 The ratio of oxygen in the oxide is 85 atomic % or more. x1 M 1A 1-x2 M 1B x2 O 2-y A 2 y (0≦x2≦0.5, 0≦y≦0.3, and at least one of x2 and y is not 0; M 1A represents at least one selected from the group consisting of Ni, Co, Mn, Cu and Fe, and M 1B represents at least one selected from the group consisting of Al, Mg, Sc, Ti, Cr, V, Zn, Ga, Zr, Mo, Nb, Ta and W, and A2 represents at least one selected from the group consisting of F, Cl, Br, S and P.

[0032] Examples of lithium composite oxides having a crystal structure belonging to P63-mmc include M1 x M2 yO2 (where M1 represents an alkali metal (preferably at least one of Na and K), M2 represents a transition metal (preferably at least one selected from the group consisting of Mn, Ni, Co, and Fe), and 0 < x + y ≦ 2). Examples of the composite oxide represented thereby include those.)

[0033] Examples of the lithium composite oxide having an O2-type structure include, for example, Li x [Li α (Mn a Co b M c ) 1-α O2 (0.5 < x < 1.1, 0.1 < α < 0.33, 0.17 < a < 0.93, 0.03 < b < 0.50, 0.04 < c < 0.33, and M represents at least one selected from the group consisting of Ni, Mg, Ti, Fe, Sn, Zr, Nb, Mo, W, and Bi). Examples of the composite oxide represented thereby include, specifically, Li 0.744 [Li 0.145 Mn 0.625 Co 0.115 Ni 0.115 O2 and the like.)

[0034] In addition, the positive electrode preferably contains a solid electrolyte selected from the group of solid electrolytes consisting of a sulfide solid electrolyte, an oxide solid electrolyte, and a halide solid electrolyte in addition to the positive electrode active material, and a mode in which at least a part of the surface of the positive electrode active material is coated with a sulfide solid electrolyte, an oxide solid electrolyte, or a halide solid electrolyte is more preferable. Examples of the halide solid electrolyte for coating at least a part of the surface of the positive electrode active material include Li 6-(4-x)b (Ti 1-x Al x ) b F6 (0 < x < 1, 0 < b ≦ 1.5) [LTAF electrolyte] is preferable.)

[0035] Examples of the conductive material include carbon materials. The electrolyte may be a solid electrolyte or a liquid electrolyte. The solid electrolyte may be an organic solid electrolyte such as a gel electrolyte, or an inorganic solid electrolyte such as an oxide solid electrolyte or a sulfide solid electrolyte. The liquid electrolyte (electrolytic solution) contains, for example, a supporting salt such as LiPF6 and a solvent such as a carbonate-based solvent. Examples of the binder include a rubber-based binder and a fluoride-based binder.

[0036] The negative electrode active material layer contains at least a negative electrode active material. The negative electrode active material layer may further contain at least one of a conductive material, an electrolyte, and a binder. Examples of the negative electrode active material include metal active materials such as Li and Si, carbon active materials such as graphite, Li4Ti5O 12 The oxide active material may be, for example, a foil or mesh. The conductive material, electrolyte, and binder are the same as those described above.

[0037] The electrolyte layer is disposed between the positive electrode active material layer and the negative electrode active material layer and contains at least an electrolyte. The electrolyte may be a solid electrolyte or a liquid electrolyte. The electrolyte layer is preferably a solid electrolyte layer. The electrolyte layer may have a separator.

[0038] The solid electrolyte preferably contains at least one solid electrolyte species selected from the group of solid electrolytes consisting of sulfide solid electrolytes, oxide solid electrolytes, and halide solid electrolytes.

[0039] As a sulfide solid electrolyte, it is preferably contained sulfur (S) as a main component of the anion element, and further preferably contains, for example, Li element, A element, and S element. The A element is at least one selected from the group consisting of P, As, Sb, Si, Ge, Sn, B, Al, Ga, and In. The sulfide solid electrolyte may further contain at least one of O and a halogen element. Examples of the halogen element (X) include F, Cl, Br, I, etc. The composition of the sulfide solid electrolyte is not particularly limited, and examples thereof include xLi2S·(100-x)P2S5 (70≦x≦80), yLiI·zLiBr·(100-y-z)(xLi2S·(1-x)P2S5) (0.7≦x≦0.8, 0≦y≦30, 0≦z≦30). The sulfide solid electrolyte may have a composition represented by the following general formula (1). Li 4-x Ge 1-x P x S4(0<x<1) ··· Formula (1) In Formula (1), at least a part of Ge may be substituted with at least one selected from the group consisting of Sb, Si, Sn, B, Al, Ga, In, Ti, Zr, V, and Nb. Also, at least a part of P may be substituted with at least one selected from the group consisting of Sb, Si, Sn, B, Al, Ga, In, Ti, Zr, V, and Nb. A part of Li may be substituted with at least one selected from the group consisting of Na, K, Mg, Ca, and Zn. A part of S may be substituted with a halogen. The halogen is at least one of F, Cl, Br, and I.

[0040] As an oxide solid electrolyte, it is preferably contained oxygen (O) as a main component of the anion element, and for example, it may contain Li, Q element (Q represents at least one of Nb, B, Al, Si, P, Ti, Zr, Mo, W, and S), and O. Examples of the oxide solid electrolyte include garnet-type solid electrolytes, perovskite-type solid electrolytes, NASICON-type solid electrolytes, Li-P-O-based solid electrolytes, Li-B-O-based solid electrolytes, etc. Examples of the garnet-type solid electrolyte include, for example, Li7La3Zr2O 12 、Li 7-x La3(Zr2-x Nb x )O 12 (0 ≦ x ≦ 2), Li5La3Nb2O 12 and the like. Examples of perovskite-type solid electrolytes include (Li, La)TiO3, (Li, La)NbO3, (Li, Sr)(Ta, Zr)O3, etc. Examples of NASICON-type solid electrolytes include Li(Al, Ti)(PO4)3, Li(Al, Ga)(PO4)3, etc. Examples of Li-P-O-based solid electrolytes include Li3PO4, LIPON (a compound in which a part of O in Li3PO4 is replaced by N), and examples of Li-B-O-based solid electrolytes include Li3BO3, a compound in which a part of O in Li3BO3 is replaced by C, etc.

[0041] As the halide solid electrolyte, a solid electrolyte containing Li, M, and X (M represents at least one of Ti, Al, and Y, and X represents F, Cl, or Br) is suitable. Specifically, Li 6-3z Y z X6 (X represents Cl or Br, and z satisfies 0 < z < 2), Li 6-(4-x)b (Ti 1-x Al x ) b F6 (0 < x < 1, 0 < b ≦ 1.5) is preferred. Among Li 6-3z Y z X6, Li3YX6 (X represents Cl or Br) is more preferred in terms of excellent lithium ion conductivity, and further Li3YCl6 is preferred. Also, Li 6-(4-x)b (Ti 1-x Al x ) b F6 (0 < x < 1, 0 < b ≦ 1.5) is preferably included together with a solid electrolyte such as a sulfide solid electrolyte from the viewpoint of suppressing oxidative decomposition of the sulfide solid electrolyte, etc.

[0042] The positive electrode current collector collects the current of the positive electrode active material layer. Examples of the positive electrode current collector include stainless steel, aluminum, nickel, iron, titanium, and carbon, and aluminum alloy foil or aluminum foil is preferable. The aluminum alloy foil and aluminum foil may be manufactured using powder. The shape of the positive electrode current collector is, for example, a foil shape or a mesh shape.

[0043] The negative electrode current collector collects current from the negative electrode active material layer. Examples of the material for the negative electrode current collector include metals such as copper, SUS, and nickel. Examples of the shape of the negative electrode current collector include a foil shape and a mesh shape.

[0044] ·Battery structure The structure of the solid-state battery is a laminated structure of a positive electrode / anode / solid electrolyte layer. The solid-state battery includes a so-called all-solid-state battery using a solid electrolyte as an electrolyte, and the solid electrolyte may contain an electrolytic solution of less than 10 mass% with respect to the total amount of the electrolyte. The solid electrolyte may be a composite solid electrolyte containing an inorganic solid electrolyte and a polymer electrolyte.

[0045] The positive electrode has a positive electrode active material layer and a current collector, and the negative electrode has a negative electrode active material layer and a current collector. The solid electrolyte layer may have a single-layer structure or a multi-layer structure having two or more layers. The solid-state battery may have a cross-sectional structure shown in FIG. 4, for example, and the solid electrolyte layer B may have a two-layer structure as shown in FIG. 4. FIG. 4 is a schematic cross-sectional view showing an example of a solid-state battery. The solid-state battery shown in FIG. 4 has a negative electrode including a negative electrode current collector 113 and a negative electrode active material layer A, a solid electrolyte layer B, and a positive electrode including a positive electrode current collector 115 and a positive electrode active material layer C. The negative electrode active material layer A includes a negative electrode active material 101, a conductive assistant 105, and a binder 109. The positive electrode active material layer C includes a coated positive electrode active material 103, a conductive assistant 107, and a binder 111, and the coated positive electrode active material 103 has a surface of a positive electrode active material coated with a LTAF electrolyte or a LiNbO3 electrolyte. The solid-state battery may be configured by sealing the end faces (side faces) of the laminated structure of the positive electrode / solid electrolyte layer / negative electrode with resin. The electrode current collector may have a buffer layer, an elastic layer, or a PTC (Positive Temperature Coefficient) thermistor layer disposed on the surface.

[0046] ·battery The laminated battery in the present disclosure is typically a lithium-ion secondary battery. Examples of uses of the battery include power sources for vehicles such as hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs), electric vehicles (BEVs), gasoline-powered vehicles, and diesel-powered vehicles. In particular, the battery is preferably used as a driving power source for hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs), or electric vehicles (BEVs). The battery in the present disclosure may also be used as a power source for moving objects other than vehicles (e.g., railways, ships, and aircraft), and may also be used as a power source for electrical appliances such as information processing devices.

[0047] The present disclosure is not limited to the above-described embodiments. The above-described embodiments are merely examples, and anything that has substantially the same configuration as the technical idea described in the claims of the present disclosure and exhibits similar effects is included in the technical scope of the present disclosure. [Explanation of symbols]

[0048] 2 electrode body, 4 laminate film, 4a one end, 4d other end, 10 laminate type battery, 40 fusion part, 40a bent part, 42u, 42d protective resin layer, 44u, 44d metal layer, 46u, 46d fusion resin layer, 6 folding roll, 8 ammeter, 84, 86 conductor, 101 negative electrode active material, 103 coated positive electrode active material, 105, 107 conductive assistant, 109, 111 binder, 113 negative electrode current collector, 115 positive electrode current collector, A negative electrode active material layer, B solid electrolyte layer, C positive electrode active material layer

Claims

1. A method for manufacturing a laminated battery comprising: an electrode body; and a laminate film that covers and encloses the electrode body, the laminate film having a structure in which at least a metal layer and a protective resin layer are laminated on the outside of the metal layer; and the laminate film has ends that are overlapped with each other and have fused inner surfaces to form a fused portion, a bending step of contacting the fused portion with a bending member and bending the fused portion into an angular or arc shape at an angle of 90° or less to form one or more bent portions, The bending member is made of a conductive material, The method for manufacturing a laminated battery, wherein the folding step is a step of performing folding while checking electrical continuity between the folding member and the metal layer of the laminate film.

2. 2. The method for manufacturing a laminated battery according to claim 1, wherein the bending member is a fulcrum member that is brought into contact with a valley fold side of the bent portion of the laminate film as a fulcrum.

3. 2. The method for manufacturing a laminated battery according to claim 1, wherein the folding process is a process in which a folding roll is disposed as the folding member, and the folding roll is brought into contact with the fused portion of the laminate film while moving the laminated battery in a direction corresponding to the rotation of the folding roll to form the bent portion.

4. 4. The method for manufacturing a laminated battery according to claim 3, wherein the folding process is a process in which a plurality of folding rolls are arranged in the direction of movement of the laminated battery, the plurality of folding rolls are sequentially brought into contact with the fused portion of the laminate film while moving the laminated battery to form the bent portion, and folding is performed while confirming electrical continuity between at least the folding roll that finally contacts the bent portion and the metal layer of the laminate film.

5. An apparatus for manufacturing a laminated battery, comprising: an electrode body; and a laminate film that covers and encloses the electrode body, the laminate film having a structure in which at least a metal layer and a protective resin layer are laminated on the outside of the metal layer, and the laminate film has ends that are overlapped with each other and have fused inner surfaces to form a fused portion, A bending member made of a conductive material that comes into contact with the fused portion and bends the fused portion into an angular or arc shape at an angle of 90° or less to form a bent portion; a conductive confirmation means connected to the bending member and the metal layer of the laminate film for confirming the conductive property between the bending member and the metal layer.

Images