Laminated battery manufacturing method and laminated battery manufacturing device

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 for manufacturing a laminated battery 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 portion 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 a laminated outer casing, the method comprising the steps of: abutting a pressure plate against the base point of the fold at the end of the outer casing; 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 clamping the end between the pressure plate and the pressing plate to form the folded portion. 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, and 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] Japanese Patent Application Publication No. 2019-200973 Summary of the Invention [Problem to be solved by the invention]

[0005] When forming a bent portion by folding the fused portion of a laminate film at an angle of 90° or less, cracks sometimes occur in the protective resin layer of the laminate film. While these cracks can occur in the protective resin layer on the mountain fold side of the bent portion, they are particularly noticeable in the protective resin layer on the valley fold side of the bent portion. Therefore, there is a need for a manufacturing method and manufacturing apparatus 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, thereby enabling laminated batteries with cracks in the protective resin layer (i.e., defective laminated batteries) to be removed 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 device for a laminated battery that can detect whether or not cracks have occurred in the protective resin layer at the bend of the fused part. [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 films have end portions that are overlapped with each other and fused at their inner surfaces to form a fused portion, a bending step of bringing a bending member into contact with the fused portion and bending it 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 contacts the valley fold side of the bent portion of the laminate film as a fulcrum. <1> A method for manufacturing 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 battery in a direction corresponding to the rotation of the folding roll to form the bent portion. <1> or <2> A method for manufacturing the laminated battery according to claim 1. <4> The folding step is a step in which a plurality of folding rolls are arranged in the moving direction of the laminated battery, the folding rolls are sequentially brought into contact with the fused portion of the laminate film while the laminated battery is being moved, thereby forming the bent portion, and the folding is performed while confirming electrical continuity between at least the folding roll that comes into contact with the bent portion last and the metal layer of the laminated film. <3> A method for manufacturing 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 a fused portion where ends of the laminate film are overlapped and inner surfaces are fused, a bending member made of a conductive material that comes into contact with the fused portion and bends it into an angular or arc shape at an angle of 90° or less to form a bent portion; a continuity checking means connected to the bending member and the metal layer of the laminate film, for checking the continuity between the bending member and the metal layer. [Effects of the Invention]

[0008] According to the present disclosure, it is possible to provide a laminated battery manufacturing method and a laminated battery manufacturing device that are capable of detecting the occurrence of cracks in the protective resin layer at the bend in the fused portion. [Brief explanation 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. [Figure 2] 3 is a schematic cross-sectional view illustrating a folding step for forming a bent portion in the manufacturing method of a laminated battery according to the present embodiment, and a manufacturing apparatus for a laminated battery for forming the bent portion. FIG. [Figure 3] FIG. 3 is a schematic cross-sectional view illustrating a state in which a crack has occurred in the protective resin layer in FIG. 2. [Figure 4] FIG. 1 is a schematic cross-sectional view showing an example of a solid-state battery. DETAILED DESCRIPTION OF THE INVENTION

[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 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. The bending step 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 a manufacturing apparatus for manufacturing a laminated battery, which has 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 to form a fused portion where the inner surfaces are fused. The laminated battery manufacturing device 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 illustrations, and the size and shape of each part are appropriately exaggerated to facilitate understanding.

[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 assembly 2 and a laminate film 4 that covers and encloses the electrode assembly 2. The laminate film 4 has its edges overlapped and its inner surface fused 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 fused together at their inner surfaces, i.e., 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 including metal layers 44u and 44d, protective resin layers 42u and 42d on the outside of the metal layers 44u and 44d, and fused resin layers 46u and 46d on the inside of the metal layers 44u and 44d.

[0015] In FIG. 2, a 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 at the fused portion 40. The folding roll 6 is used as a fulcrum to fold the laminate film 4 at an angle of 90° or less, forming the bent portion 40a. In other words, the folding roll 6 is a fulcrum member that contacts the valley fold side of the bent 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 fused portion 40 moves in a direction corresponding to the rotation of the folding roll 6, i.e., in a direction facing the front side in FIG. 2. The bent portion 40a is formed by bringing the folding roll 6 into contact with the moving fused portion 40. Although not shown, an opposing member (e.g., an opposing roll) as a folding member may also be in contact with the mountain fold side of the bent portion 40a (below the fused portion 40 in FIG. 2).

[0016] The laminated battery manufacturing apparatus shown in Fig. 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 partially 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 forming a bent portion by folding the fused portion of a laminate film at an angle of 90° or less, 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 the folding. While these cracks can occur in the protective resin layer on the mountain fold side of the bent portion, they are 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 the pressing of the folding member makes it easier for cracks to occur 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 bend angle (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 detect 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 can detect the occurrence of cracks in the protective resin layer on the valley fold side and 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 the folding members, to confirm the continuity between the folding roll 6 and the metal layer 44u. The folding is performed while checking the continuity between the folding roll 6 and the metal layer 44u using the ammeter 8. When no cracks have occurred in the protective resin layer 42u on the temporary 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, and no electrical continuity is confirmed. However, when a crack 420 occurs in the protective resin layer 42u on the temporary 4u side of the laminate film 4, as shown in FIG. 3, and the folding roll 6 and the metal layer 44u come into contact, electrical continuity is confirmed by the ammeter 8. As a result, in this embodiment, electrical continuity is confirmed when a tear has occurred in the protective resin layer, and therefore, the presence or absence of a tear in the protective resin layer of the laminate film in the laminated battery to be manufactured can be confirmed. As a result, laminated batteries with cracks in the protective resin layer (i.e., defective laminated batteries) can be removed before shipping.

[0019] In FIG. 2, the bending roll 6 serving as the bending 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, this is not limiting, and the bending member (e.g., bending 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, it is possible to detect the occurrence of cracks in the protective resin layer on the mountain fold side of the bent portion of the fused portion. Furthermore, the bending member (e.g., bending 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, it is possible to detect the occurrence of cracks in the protective resin layer on the mountain fold side and the valley fold side of the bent portion of the fused portion.

[0020] In an embodiment of the present disclosure, multiple folding rolls may be arranged in the direction of movement of the laminated battery, or multiple folding rolls may be sequentially brought into contact with the fused portion of the laminate film while the laminated battery is being moved to form the bent portion. In this case, it is preferable to perform the folding while checking the electrical continuity between at least the folding roll that will last contact the bent portion and the metal layer of the laminate film. By checking the electrical continuity between the folding roll that will last contact the bent portion and the metal layer of the laminate film, it is possible to detect cracks that occurred before the folding roll contacted the bent portion.

[0021] The number of bent portions in the fused portion is one or more, and may be two or more. The angle of the bent portion in the fused portion may be 90° or less, may be an angle more acute than 90°, or may be 0° (i.e., a bent portion in a shape in which the fused portion is bent 180°). The bent portion has a shape that is bent into an angular or arc. "Angular" means a shape with corners, and "arc" means a curved shape without corners.

[0022] Although a bending roll is shown as the bending member in FIG. 2, the bending member is not limited to this. For example, the bending member may be configured such that a plate-shaped member serving as a fulcrum member is in contact with the valley fold side of the bent portion and a block-shaped pressing member is in contact with the mountain fold side of the bent portion to perform bending. At least a portion of the bending member is made of a conductive material. Specifically, at least a portion of the bending member is made of a conductive material so that the portion of the fused portion that contacts the protective resin layer (i.e., the portion that contacts the metal layer inside the protective resin layer when a crack occurs in the protective resin layer) and the portion connected to the continuity check means are electrically conductive. The entire bending member may be made of a conductive material. An example of a 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 assembly and laminate film that constitute 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 outside of the metal layer. It may also be a three-layer film having an additional fusion resin layer on the inside 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 typically 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 element 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 referred to as P63mc or P6 / mmc). The lithium composite oxide may have an O2-type structure in which the transition metal, oxygen, and lithium are primarily 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 satisfy the conditions 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 include those represented by this formula.

[0033] As the lithium composite oxide having an O2-type structure, for example, Li x [Li α (Mn a Co b M c ) 1-α O2 (where 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 include those represented by this formula, and specific examples include 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 sulfide solid electrolytes, oxide solid electrolytes, and halide solid electrolytes 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. As the halide solid electrolyte for coating at least a part of the surface of the positive electrode active material, Li 6-(4-x)b (Ti 1-x Al x ) b F6 (where 0 < x < 1, 0 < b ≦ 1.5) [LTAF electrolyte] is preferable.

[0035] Examples of conductive materials 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 binders include rubber-based binders and fluoride-based binders.

[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, and Li4Ti5O 12 The negative electrode current collector may be in the form of, for example, a foil or a 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 consisting of sulfide solid electrolytes, oxide solid electrolytes, and halide solid electrolytes.

[0039] As a sulfide solid electrolyte, it is preferable to contain sulfur (S) as the main component of the anion element, and further, for example, it is preferable to contain 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 halogen elements. 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 preferable to contain oxygen (O) as the 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 electrolyte, perovskite-type solid electrolyte, NASICON-type solid electrolyte, Li-P-O-based solid electrolyte, Li-B-O-based solid electrolyte, 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 the perovskite-type solid electrolyte include (Li, La)TiO3, (Li, La)NbO3, (Li, Sr)(Ta, Zr)O3, etc. Examples of the NASICON-type solid electrolyte include Li(Al, Ti)(PO4)3, Li(Al, Ga)(PO4)3, etc. Examples of the Li-P-O-based solid electrolyte include Li3PO4, LIPON (a compound in which a part of O in Li3PO4 is substituted with N), and examples of the Li-B-O-based solid electrolyte include Li3BO3, a compound in which a part of O in Li3BO3 is substituted with 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 the oxidative decomposition of the sulfide solid electrolyte, etc.

[0042] The positive electrode current collector collects current from 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 preferred. Aluminum alloy foil and aluminum foil may be manufactured using powder. The positive electrode current collector may have a foil or mesh shape, for example.

[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 foil and mesh.

[0044] ·Battery structure The structure of a solid-state battery is a laminated structure of a positive electrode, a solid electrolyte layer, and a negative electrode. The solid-state battery includes so-called all-solid-state batteries that use a solid electrolyte as the electrolyte, and the solid electrolyte may contain an electrolytic solution in an amount of less than 10 mass % relative to the total amount of the electrolyte. The solid electrolyte may also 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 of two or more layers. The solid-state battery may have, for example, a cross-sectional structure shown in FIG. 4, 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 an anode including an anode current collector 113 and an anode active material layer A, a solid electrolyte layer B, and a cathode including a cathode current collector 115 and a cathode active material layer C. The anode active material layer A includes an anode active material 101, a conductive additive 105, and a binder 109. The cathode active material layer C includes a coated cathode active material 103, a conductive additive 107, and a binder 111, and the surface of the coated cathode active material 103 is coated with an LTAF electrolyte or a LiNbO 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 a resin. The current collector of the electrode 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 automobiles, and diesel-powered automobiles. It is particularly preferred that the battery be 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 mobile objects other than vehicles (e.g., trains, ships, and aircraft), or 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 any configuration that is substantially identical to the technical idea described in the claims of the present disclosure and that provides similar effects is included within the technical scope of the present disclosure. [Explanation of symbols]

[0048] 2 electrode body, 4 laminate film, 4a one end, 4d other end, 10 laminated battery, 40 fused portion, 40a bent portion, 42u, 42d protective resin layer, 44u, 44d metal layer, 46u, 46d fused resin layer, 6 folding roll, 8 ammeter, 84, 86 conducting wire, 101 negative electrode active material, 103 coated positive electrode active material, 105, 107 conductive additive, 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 having a fused portion where end portions of the laminate film are overlapped and fused together at their inner surfaces, a bending step of bringing a bending member into contact with the fused portion and bending it 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 bending step is a step in which a bending roll is disposed as the bending member, and the bending 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 bending roll to form the bent portion.

4. 4. The method for manufacturing a laminated battery according to claim 3, wherein the bending process is a process in which a plurality of bending rolls are arranged in the direction of movement of the laminated battery, the plurality of bending 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 the bending is performed while confirming electrical continuity between at least the folding roll that comes into contact with the bent portion last and the metal layer of the laminated 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 having a fused portion where end portions are overlapped and inner surfaces are fused together, a bending member made of a conductive material that comes into contact with the fused portion and bends it into an angular or arc shape at an angle of 90° or less to form a bent portion; a continuity checking means connected to the bending member and the metal layer of the laminate film, for checking the continuity between the bending member and the metal layer.

Images