Laminate battery and method for manufacturing laminate battery

Abstract

To provide a laminate battery which can increase the structural efficiency of a fusion part and also can suppress generation of breakage of a laminate film at the same time.SOLUTION: The laminate battery includes: an electrode body; and a laminate film for sealing the electrode body by covering the electrode body. The laminate film has a fusion part in which end parts are overlapped with each other and the inner surface is fused. The fusion part includes: two bending parts bent to form an angle of 90 degrees at a maximum or to form an arc; and a roll part arranged closer to the end of the fusion part than the two bending parts, the roll part being rolled.SELECTED DRAWING: Figure 1

Description

[Technical field]

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

[0002] In a laminate type 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 in order to encapsulate the electrode body.

[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] Conventionally, in laminated batteries, there has been a demand for improving structural efficiency by saving space at the fused portion of the laminate film, and for this purpose, a bent portion is formed by folding a part of the fused portion, but stress may be concentrated at the bent portion, causing the laminate film to tear.

[0006] The present disclosure has been made in consideration of the above-described situation, and aims to provide a laminated battery that can improve the structural efficiency of the fused parts while suppressing the occurrence of tears in the laminate film, and a method for manufacturing such a laminated battery. [Means for solving the problem]

[0007] <1> An electrode body; A laminate film that covers and encapsulates the electrode body, The laminate film has a fused portion where the ends are overlapped and fused to each other at the inner surface, The fused portion is a laminated battery having two bent portions bent into an angular or arc shape at an angle of 90° or less, and a roll portion that is positioned closer to the tip of the fused portion than the two bent portions and is rolled up into a roll. <2> The angle of the bent portion is 60° or more. <1> 2. The laminated battery according to claim 1 . <3> The height of the fusion portion in the thickness direction of the electrode body is equal to or less than the thickness of a portion of the laminated battery having the electrode body. <1> or <2> 2. The laminated battery according to claim 1 . <4> An electrode body; A laminate film that covers and encapsulates the electrode body, A method for manufacturing a laminated battery having a fused portion in which ends of the laminate film are overlapped and fused on the inner surface, comprising: a rolling step of rolling the fused portion into a roll shape from the tip side; a pressing step in which press members are pressed against the rolled fused portion from at least two directions to press it and bend it into an angular or arc shape at an angle of 90° or less to form two bent portions. <5> The pressing step is a step of pressing the press members from three directions. <4> A method for producing the laminated battery according to claim 1. Effect of the Invention

[0008] According to the present disclosure, it is possible to provide a laminated battery that can improve the structural efficiency of the fused parts while suppressing the occurrence of tears in the laminate film, and a method for manufacturing the laminated battery. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a schematic cross-sectional view illustrating a laminated battery according to an embodiment of the present disclosure. [Diagram 2] 1 is a schematic cross-sectional view illustrating a step of a manufacturing method for a laminated battery according to an embodiment of the present disclosure. [Diagram 3] 1 is a schematic cross-sectional view illustrating a step of a manufacturing method for a laminated battery according to an embodiment of the present disclosure. [Figure 4] 3A and 3B are a schematic top view and a schematic cross-sectional view illustrating a rolling step in a manufacturing method for a laminated battery according to an embodiment of the present disclosure. [Diagram 5] 1 is a schematic cross-sectional view illustrating a step of a manufacturing method for a laminated battery according to an embodiment of the present disclosure. [Figure 6] 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> A laminated battery according to an embodiment of the present disclosure includes an electrode assembly and a laminate film that covers and encapsulates the electrode assembly. The laminate film has a fused portion where the ends are overlapped and the inner surfaces are fused. The fused portion has two bent portions that are bent into an angular or arc shape at an angle of 90° or less, and a roll portion that is disposed on the tip side of the fused portion relative to the two bent portions and is rolled into a roll.

[0011] Hereinafter, one embodiment of a laminate type battery according to an embodiment of 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.

[0012] FIG. 1 is a schematic cross-sectional view illustrating a laminate-type battery according to an embodiment of the present disclosure. 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 a fused portion 40 in which the ends are overlapped and the inner surface is fused. The fused portion 40 has two bent portions 40A, 40B that are bent into an angular or arc shape at an angle of 90° or less, and a roll portion 40C that is disposed on the tip side 40D of the fused portion 40 from the two bent portions 40A, 40B and rolled into a roll. The roll portion 40C is rolled into a roll toward the inside of the fused portion 40 having the two bent portions 40A, 40B (i.e., toward the side where the angle is 90° or less at the two bent portions 40A, 40B). The roll portion refers to a portion in which a curved shape is continuous.

[0013] The laminated battery according to the embodiment of the present disclosure has the above-described configuration, and thus can improve the structural efficiency of the fused portion while suppressing the occurrence of tears in the laminate film.

[0014] First, the laminated battery according to the embodiment of the present disclosure has a rolled-up portion at the tip side of the fused portion, thereby saving space and improving the structural efficiency of the fused portion. Furthermore, since the laminated battery has a roll portion closer to the tip of the fused portion than the two bent portions, the structural efficiency can be improved as described above even if the bending angles at the two bent portions are not extremely acute (e.g., bent portions with an angle of 0°). In a bent portion with an extremely acute angle (e.g., an angle of 0°), stress may concentrate at the acute corner, causing tears in the laminated film. However, in the embodiment of the present disclosure, the structural efficiency can be improved even if the bending angles at the two bent portions are not extremely acute, so that stress concentration at the corners can be alleviated and the occurrence of tears in the laminated film can be suppressed.

[0015] From the above, it is presumed that the laminated battery according to the embodiment of the present disclosure can improve the structural efficiency of the fused portion while suppressing the occurrence of tears in the laminate film.

[0016] Bend angle The two bent portions are bent into an angular or arc shape such that the angles (for example, in the laminate-type battery 10 shown in FIG. 1, bent portion 40A is angle a, and bent portion 40B is angle b) are both 90° or less. Having an angle of 90° or less can increase the structural efficiency of the fused portion. The angles of the two bent portions are preferably less than 90°, and more preferably 80° or less. In addition, from the viewpoint of preventing the occurrence of tearing of the laminate film due to stress concentration, the angles of the two bent portions are preferably both 50° or more, more preferably 60° or more, and even more preferably 70° or more.

[0017] Height of fusion part The height of the fused portion, that is, the height of the fused portion in the thickness direction of the electrode body (for example, the direction of arrow Y in FIG. 1) (for example, in laminate-type battery 10 shown in FIG. 1, it is height d1 at fused portion 40) is preferably equal to or less than the thickness of the portion of the laminate-type battery having the electrode body (for example, height d2 in laminate-type battery 10 shown in FIG. 1). Having the height of the fused portion equal to or less than the thickness of the portion having the electrode body can increase the structural efficiency of the battery.

[0018] Width of fusion part The width of the fused portion will be described. The width of the fused portion refers to the length from the end of the portion having the electrode body in the laminated battery to the end of the fused portion of the laminated film in the direction of the side where the fused portion of the laminated film is formed as viewed from the electrode body side in the laminated battery (for example, the direction of the arrow X in FIG. 1) (for example, in the laminated battery 10 shown in FIG. 1, it is the width c of the fused portion 40). From the viewpoint of increasing the structural efficiency of the battery, the width of the fused portion is preferably 0.5 mm or more and 2.0 mm or less, and more preferably 0.8 mm or more and 1.5 mm or less.

[0019] <Laminated battery manufacturing method> Next, a method for manufacturing a laminated battery according to an embodiment of the present disclosure will be described. A manufacturing method for a laminated battery according to an embodiment of the present disclosure is a method for manufacturing a laminated battery having an electrode body and a laminate film that covers and encapsulates the electrode body, and having a fused portion where the ends of the laminate film are overlapped and fused to each other on the inner surface. The manufacturing method for this laminated battery includes a rolling process in which the fused portion is rolled into a roll from the tip side, and a pressing process in which press members are pressed against the rolled fused portion from at least two directions to press it and bend it into an angular or arc shape at an angle of 90° or less to form two bent portions.

[0020] Hereinafter, one embodiment of a method for manufacturing a laminated battery according to an embodiment of the present disclosure will be described with reference to the drawings.

[0021] 2, 3, and 5 are schematic cross-sectional views illustrating a step of a manufacturing method for a laminated battery according to an embodiment of the present disclosure, and FIG. 4 is a schematic top view and a schematic cross-sectional view illustrating a rolling step in the manufacturing method for a laminated battery according to an embodiment of the present disclosure. First, as shown in FIG. 2, a laminated battery 10a is prepared, which has an electrode body 2, a laminate film 4 that covers and encapsulates the electrode body 2, and has a fused portion 40a where the ends of the laminate film 4 are overlapped and fused on the inner surface, and where no bent portion or rolled portion is formed in this fused portion 40a.

[0022] ·Roll process Next, the fused portion 40a of the laminated battery 10a is subjected to a rolling process to produce a laminated battery 10b having a fused portion 40cc rolled into a roll from the tip side as shown in FIG.

[0023] Here, an example of the rolling process will be described in detail with reference to FIG. 4. FIG. 4 is a schematic top view (left side of FIG. 4) and a schematic cross-sectional view (right side of FIG. 4) illustrating the rolling process in the manufacturing method of a laminated battery according to an embodiment of the present disclosure. In the schematic cross-sectional view (right side of FIG. 4), FIG. A is a cross-sectional view showing the AA cross-section in the schematic top view (left side of FIG. 4). Similarly, in the schematic cross-sectional view, FIG. B is a cross-sectional view showing the BB cross-section in the schematic top view, FIG. C is a cross-sectional view showing the CC cross-section in the schematic top view, FIG. D is a cross-sectional view showing the DD cross-section in the schematic top view, FIG. E is a cross-sectional view showing the EE cross-section in the schematic top view, and FIG. F is a cross-sectional view showing the FF cross-section in the schematic top view.

[0024] In the method of forming the rolled portion shown in FIG. 4, a laminated-type battery 10a without bent portions or rolled portions is moved in the direction of arrow e while a rolled-portion forming member 64, which is arranged at an angle with respect to the direction of arrow e, is pressed against the fused portion 40a to form a rolled-up fused portion 40cc. The roll-part forming member 64 is disposed with an inclination with respect to the direction of the arrow e, and the inner surface 64a is circular. In the roll-part forming member 64, the end 64in on the side (i.e., the inlet side) into which the fused part 40a of the laminated battery 10a moving in the direction of the arrow e enters is disposed at a position where the tip 40ad of the fused part 40a does not come into contact, as shown in the position AA in the schematic top view (left side of FIG. 4) of FIG. 4 and the figure A in the schematic cross-sectional view (right side of FIG. 4). As the laminated battery 10a moves in the direction of the arrow e, the tip 40ad of the fused part 40a comes into contact with the inner surface 64a of the roll-part forming member 64, and the fused part 40a begins to deform into a roll shape, as shown in the position BB in the schematic top view (left side of FIG. 4) of FIG. 4 and the figure B in the schematic cross-sectional view (right side of FIG. 4). In addition, a shaft center 62 is disposed at a position facing the inner surface 64a of the roll-part forming member 64 across the fused portion 40a to assist the fused portion 40a in starting to deform into a roll shape. By providing the shaft center 62, the fused portion 40a is guided into a gap between the shaft center 62 and the inner surface 64a of the roll-part forming member 64, and the fused portion 40a becomes easier to deform into a roll shape. The shaft center 62 may be provided at a position where the fused portion 40a starts to deform into a roll shape, and is provided at the positions AA and BB in the schematic top view (left side of FIG. 4) and the positions A and B in the schematic cross-sectional view (right side of FIG. 4) in FIG. 4. On the other hand, the shaft center 62 is not provided at the positions thereafter, that is, the positions CC, DD, EE, and FF in the schematic top view (left side of FIG. 4) and the positions C, D, E, and F in the schematic cross-sectional view (right side of FIG. 4).

[0025] The fused portion 40a that has begun to deform into a roll shape is then deformed into a shape closer to a circle along the circular inner side surface 64a of the roll portion-forming member 64 as the laminated battery 10a moves in the direction of the arrow e, as shown in positions CC, DD, EE, and FF in the schematic top view (left side of FIG. 4) of FIG. 4 and in figures C, D, E, and F in the schematic cross-sectional views (right side of FIG. 4). Then, as the laminated battery 10a moves in the direction of the arrow e, all of the fused portion 40a passes through the end 64out on the outlet side of the roll portion-forming member 64, resulting in a laminated battery 10b having the fused portion 40cc rolled into a roll shape from the tip side, as shown in FIG. 3.

[0026] 4 shows a method of forming a rolled fused portion 40cc by pressing a roll-shaped rolled member 64 arranged at an angle against the fused portion 40a while moving the laminated battery 10a in the direction of the arrow e. However, the rolling process in the embodiment of the present disclosure is not particularly limited as long as it is a process that can roll the fused portion from the tip side into a roll. For example, the fused portion can be rolled from the tip side into a roll by wrapping the shaft around the tip of the fused portion and rolling the fused portion around the shaft center toward the base side of the fused portion (i.e., the end of the fused portion on the side where the electrodes are arranged).

[0027] Pressing process Next, a pressing process is carried out on the laminated battery 10b having a fused portion of 40 cc rolled into a roll shape from the tip side in the rolling process, thereby producing the laminated battery 10 shown in FIG.

[0028] FIG. 5 is a schematic cross-sectional view illustrating a pressing step in the manufacturing method for a laminate-type battery according to an embodiment of the present disclosure. In the pressing process shown in FIG. 5, pressing members 82, 84, and 86 are pressed from three directions against the fused portion 40cc rolled into a roll shape from the tip side to press (preferably heat press). Specifically, pressing member 82 from below in FIG. 5, pressing member 84 from the right side, and pressing member 86 from above to press (preferably heat press) form two bent portions 40A and 40B bent into an angular or arc shape at an angle of 90° or less. Note that the surface of the pressing member 84 pressed against the fused portion 40cc from the right side in FIG. 5 has an inclination so that the angle of the bent portion 40A is less than 90° (more preferably 80° or less). In addition, the surface of the pressing member 86 pressed against the fused portion 40cc from above in FIG. 5 also has an inclination so that the angle of the bent portion 40B is less than 90° (more preferably 80° or less).

[0029] In FIG. 5, a pressing process is described in which press members are pressed against the rounded fused portion from three directions to form two bent portions. However, the pressing process in the embodiment of the present disclosure is not particularly limited as long as it is a process that can form two bent portions bent into an angular or arc shape at an angle of 90° or less. For example, two bent portions can be formed by pressing press members against the portion from two directions. Specifically, two bent portions may be formed by pressing the portion using press member 84 pressed from the right side in FIG. 5 and press member 86 pressed from above, without using press member 82 pressed from below.

[0030] According to the manufacturing method of the laminated battery according to the embodiment of the present disclosure, which includes the rolling step and the pressing step, it is possible to improve the structural efficiency of the fused portion while suppressing the occurrence of tears in the laminate film.

[0031] Conventionally, when forming two bent portions in the fused portion of a laminate film, a folding member (e.g., a roll member) is pressed against both sides of the laminate film, and the folding member pressed against the inside serves as a fulcrum to form the bent portions. However, stress is concentrated at this fulcrum, which can cause the laminate film to tear. In contrast, in the manufacturing method of the laminated battery according to the embodiment of the present disclosure, the fusion part is rolled from the tip side in a rolling process, and then the rolled fusion part is pressed with press members from at least two directions to form two bent parts bent into an angular or arc shape at an angle of 90° or less. Therefore, as shown in FIG. 5, two bent parts can be formed without pressing a folding member (e.g., a roll member) that serves as a fulcrum against the inside of the laminate film. Therefore, stress does not concentrate on the fulcrum, and tearing of the laminate film can be suppressed. In addition, the structural efficiency of the fusion part can be improved by rolling the tip side of the fusion part into a roll shape. It is therefore presumed that, according to the embodiment of the present disclosure, it is possible to improve the structural efficiency of the fused portion while suppressing the occurrence of tears in the laminate film.

[0032] (Battery components) Next, the electrode body and laminate film constituting the laminate type battery according to this embodiment will be described.

[0033] (1) Laminate film The laminate film may have a structure including, for example, a metal layer and a protective resin layer on the outside of the metal layer. The laminate film may also have a three-layer structure including a fusion resin layer on the inside of the metal layer.

[0034] 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.

[0035] (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.

[0036] 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.

[0037] 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.

[0038] 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, satisfying 0.5≦x≦1.5, 0.5≦y≦1.0, 1≦α<2, and 0<β≦1.)

[0039] 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 is satisfied, 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. 2 NiO 2 ), Li 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.

[0040] Examples of lithium composite oxides having a crystal structure belonging to P63-mmc include M1 x M2 y O 2(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 x + y satisfies 0 < x + y ≤ 2.) Examples thereof include composite oxides represented by the formula.

[0041] 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 O 2 (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 represented by the formula include, specifically, Li 0.744 [Li 0.145 Mn 0.625 Co 0.115 Ni 0.115 O 2 and the like.

[0042] 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. Examples of the halide solid electrolyte that coats 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 F 6 (0 < x < 1, 0 < b ≤ 1.5) [LTAF electrolyte] is preferable.

[0043] The conductive material may be, for example, a carbon material. 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) may be, for example, LiPF 6 and a solvent such as a carbonate-based solvent. Examples of the binder include a rubber-based binder and a fluoride-based binder.

[0044] 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 Li 4 Ti 5 O 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.

[0045] 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.

[0046] 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.

[0047] As a sulfide solid electrolyte, it is preferably contained sulfur (S) as a main component of anionic elements, 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 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. For example, xLi 2 S·(100-x)P 2 S 5 (70≦x≦80), yLiI·zLiBr·(100-y-z)(xLi 2 S·(1-x)P 2 S 5 )(0.7≦x≦0.8, 0≦y≦30, 0≦z≦30) may be mentioned. The sulfide solid electrolyte may have a composition represented by the following general formula (1). Li 4-x Ge 1-x P x S 4 (0<x<1) ··· Formula (1) In formula (1), at least a part of Ge may be substituted by 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 by 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 by at least one selected from the group consisting of Na, K, Mg, Ca, and Zn. A part of S may be substituted by a halogen. The halogen is at least one of F, Cl, Br, and I.

[0048] The oxide solid electrolyte preferably contains oxygen (O) as a main component of an anion element, and may contain, for example, 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-PO-based solid electrolytes, and Li-BO-based solid electrolytes. Examples of the garnet-type solid electrolyte include Li 7 La 3 Zr 2 O 12 , Li 7-x La 3 (Zr 2-x Nb x )O 12 (0≦x≦2), Li 5 La 3 Nb 2 O 12 Examples of perovskite-type solid electrolytes include (Li, La)TiO 3 , (Li, La)NbO 3 , (Li,Sr)(Ta,Zr)O 3 Examples of Nasicon-type solid electrolytes include Li(Al,Ti)(PO 4 ) 3 , Li(Al,Ga)(PO 4 ) 3 Li-PO solid electrolytes include Li 3 PO 4 , LIPON (Li 3 PO 4 In Li-BO solid electrolytes, some of the O in the Li-BO system is replaced with N. 3 BO 3 , Li 3 BO 3 Examples of such compounds include those in which some of the O's are replaced by C.

[0049] 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. 6-3z Y z X 6(X represents Cl or Br, and 0 < z < 2 is satisfied.), Li 6-(4-x)b (Ti 1-x Al x ) b F 6 (0 < x < 1, 0 < b ≤ 1.5) is preferred. Li 6-3z Y z X 6 Among them, in terms of excellent lithium ion conductivity, Li 3 YX 6 (X represents Cl or Br.) is more preferred, and further Li 3 YCl 6 is preferred. Also, Li 6-(4-x)b (Ti 1-x Al x ) b F 6 (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.

[0050] The positive electrode current collector conducts current collection for the positive electrode active material layer. Examples of the positive electrode current collector include stainless steel, aluminum, nickel, iron, titanium, carbon, etc., and an aluminum alloy foil or an aluminum foil is preferred. The aluminum alloy foil and the aluminum foil may be manufactured using powder. The shape of the positive electrode current collector is, for example, foil-shaped or mesh-shaped.

[0051] The negative electrode current collector conducts current collection for the negative electrode active material layer. Examples of the material of 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-shaped and mesh-shaped.

[0052] · Battery structure The structure of the solid battery has a laminated structure of positive electrode / solid electrolyte layer / negative electrode. The solid battery includes so-called all-solid batteries using a solid electrolyte as the electrolyte, and the solid electrolyte may contain an electrolytic solution of less than 10% by mass based on the total amount of the electrolyte. Note that the solid electrolyte may be a composite solid electrolyte including an inorganic solid electrolyte and a polymer electrolyte.

[0053] 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, for example, a cross-sectional structure shown in FIG. 6, and the solid electrolyte layer B may have a two-layer structure as shown in FIG. 6. FIG. 6 is a schematic cross-sectional view showing an example of a solid-state battery. The solid-state battery shown in FIG. 6 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 is a positive electrode active material having a surface coated with an LTAF electrolyte or LiNbO 3 It is coated with an 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.

[0054] ·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.

[0055] 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]

[0056] 2 electrode body, 4 laminate film, 10, 10a, 10b laminate type battery, 40, 40a, 40cc fusion part, 40A, 40B bent part, 40C roll part, 40D, 40ad tip, 62 shaft center, 64 roll part forming member, 82, 84, 86 press member, 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. An electrode body; A laminate film that covers and encapsulates the electrode body, The laminate film has a fused portion where the ends are overlapped and fused to each other at the inner surface, The fused portion has two bent portions bent into an angular or arc shape at an angle of 90° or less, and a roll portion that is positioned closer to the tip of the fused portion than the two bent portions and is rolled up into a roll. This is a laminated battery.

2. 2. The laminated battery according to claim 1, wherein the angle of the bent portion is 60 degrees or more.

3. 3. The laminated battery according to claim 1, wherein a height of the fused portion in a thickness direction of the electrode body is equal to or less than a thickness of a portion of the laminated battery having the electrode body.

4. An electrode body; A laminate film that covers and encapsulates the electrode body, A method for manufacturing a laminated battery having a fused portion in which ends of the laminate film are overlapped and fused on the inner surface, comprising: a rolling step of rolling the fused portion into a roll shape from the tip side; a pressing step of pressing the rolled fused portion against a press member from at least two directions to bend it into an angular or arc shape at an angle of 90° or less, thereby forming two bent portions.

5. 5. The method for producing a laminated battery according to claim 4, wherein the pressing step is a step of pressing the pressing members from three directions.

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