Laminated solid battery

Abstract

To provide a laminated solid-state battery that can preferably accommodate an electrode laminated body.SOLUTION: The laminated solid-state battery has an electrode laminate and an outer body composed of laminated film and accommodating the electrode laminate. An insulating member is arranged inside the outer body in contact with at least one of the stacked end faces of the electrode laminate. The insulating member has an inclined surface that slopes toward the outside from the electrode laminate in a cross-sectional view along the stacking direction. The angle between the inclined surface and the stacking surface of the electrode laminate is greater than 90° and less than 180°.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] This invention relates to a laminate-type solid-state battery. [Background technology]

[0002] In recent years, research and development has been conducted on secondary batteries that contribute to energy efficiency, in order to ensure that more people have access to affordable, reliable, sustainable, and advanced energy. Among secondary batteries, solid-state batteries, which use a solid electrolyte, are attracting attention.

[0003] Solid-state batteries have an electrode laminate in which a positive electrode, a solid electrolyte, and a negative electrode are stacked. A technique has been disclosed in which the stacked end faces of the electrode laminate are covered with an insulating resin for the purpose of preventing damage and providing insulation (see, for example, Patent Document 1).

[0004] As an outer casing for housing the above-mentioned electrode stack, a laminated outer casing made by welding one or two laminate films together is known. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2020-004697 [Overview of the project] [Problems that the invention aims to solve]

[0006] In conventional technologies, including the technology disclosed in Patent Document 1, as shown in Figure 9, rectangular insulating members 31g and 32g are arranged at the ends of the electrode stack in cross-sectional view. Therefore, when the electrode stack 2 and insulating members 31g and 32g are housed in the outer casings 41g and 42g, wrinkles or cracks may occur at the corners c6. In addition, the welding of the welded parts j1 and j2 may be insufficient during manufacturing, and the sealing performance may be impaired due to the expansion of the electrode stack accompanying the charging and discharging of the laminate-type solid battery 1g.

[0007] The present invention has been made in view of the above, and aims to provide a laminate-type solid battery that can preferably accommodate an electrode stack. [Means for solving the problem]

[0008] (1) The present disclosure relates to a laminate-type solid battery having an electrode stack and an outer casing made of a laminate film that houses the electrode stack, wherein an insulating member is disposed inside the outer casing that abuts against at least one of the stacked end faces of the electrode stack, and the insulating member has an inclined surface that slopes outward from the electrode stack in a cross-sectional view along the stacking direction, and the angle between the inclined surface and the stacked surface of the electrode stack is greater than 90° and less than 180°.

[0009] According to (1), a laminate-type solid battery that can preferably accommodate an electrode stack can be provided.

[0010] (2) The laminate-type solid battery described in (1), wherein the inclined surface consists of a plurality of inclined surfaces.

[0011] According to (2), a laminate-type solid battery that can more preferably accommodate the electrode stack can be provided.

[0012] (3) The laminate-type solid battery according to (1) or (2), wherein the inclined surface has a curved surface.

[0013] According to (3), a laminate-type solid battery that can more preferably accommodate the electrode stack can be provided.

[0014] (4) The laminate-type solid battery according to (1) or (2), wherein the outer casing has a welded portion, and an H2S absorbent and / or H2O absorbent is disposed between the insulating member and the welded portion inside the outer casing.

[0015] (4) According to this, it is possible to prevent water from entering the interior of the exterior body, the generation of hydrogen sulfide causing the exterior body to expand, and the welded portion of the exterior body from being damaged.

[0016] (5) The exterior body is composed of a single laminated film, and the insulating member that abuts on the laminated end face of the electrode laminate on the side where the welded portion of the exterior body is not formed has a flat portion along the lamination direction of the electrode laminate. The laminated solid battery according to (1) or (2).

[0017] (5) According to this, a plurality of laminated solid batteries can be easily modularized.

Brief Description of the Drawings

[0018] [Figure 1] It is a cross-sectional view showing the configuration of the laminated solid battery according to the first embodiment. [Figure 2] It is a top view showing the configuration of the laminated solid battery according to the first embodiment. [Figure 3] It is a schematic cross-sectional view of an enlarged main part of FIG. 1. [Figure 4] It is a cross-sectional view showing the configuration of the laminated solid battery according to the second embodiment. [Figure 5] It is a cross-sectional view showing the configuration of the laminated solid battery according to the third embodiment. [Figure 6] It is a cross-sectional view showing the configuration of the laminated solid battery according to the fourth embodiment. [Figure 7] It is a cross-sectional view showing the configuration of the laminated solid battery according to the fifth embodiment. [Figure 8] It is a cross-sectional view showing the configuration of the laminated solid battery according to the sixth embodiment. [Figure 9] It is a cross-sectional view showing the configuration of the laminated solid battery according to the prior art. [Figure 10] It is a cross-sectional view showing the configuration of a battery module composed of the laminated solid battery according to the embodiment.

Embodiments for Carrying Out the Invention

[0019] <First Embodiment> As shown in Figure 1, the laminate-type solid battery 1 according to this embodiment is constructed by housing an electrode stack 2, which uses a solid electrolyte as the electrolyte, in outer casings 41 and 42 made of laminate film. Inside the outer casings 41 and 42, insulating members 31 and 32 are arranged so as to abut the stacked end faces of the electrode stack 2.

[0020] [Electrode Stack] Figure 3 is a schematic diagram showing the configuration of the electrode stack 2 according to this embodiment. As shown in Figure 3, the electrode stack 2 has a stacked structure in which a negative electrode layer consisting of a negative electrode current collector 211 and a negative electrode active material layer 212, an intermediate layer 213, a solid electrolyte layer 23, and a positive electrode layer consisting of a positive electrode active material layer 222 and a positive electrode current collector 221 are stacked in this order. The stacked end faces of the positive electrode active material layer 222 are covered with an insulating layer 24. A stacked unit 2a is formed by stacking the above stacked structures so that identical electrodes (positive electrode layers in Figure 3) are in contact with each other. In detail, the stacked unit 2a is formed by stacking a double-sided coated positive electrode layer, in which a positive electrode active material layer 222 is formed on both sides of a single positive electrode current collector 221, sandwiched between two negative electrode layers via an intermediate layer 213 and a solid electrolyte layer 23. In Figure 3, three stacked units, 2a, 2b, and 2c, are shown, but the number of stacked units is not particularly limited.

[0021] (Negative electrode layer) The negative electrode current collector 211 is not particularly limited as long as it has the function of collecting current from the negative electrode layer, and examples of materials for the negative electrode current collector include nickel, copper, and stainless steel. Examples of shapes for the negative electrode current collector include foil-like and plate-like forms. The negative electrode current collector 211 is electrically connected to the negative electrode terminal 21 in Figure 2.

[0022] The negative electrode active material layer 212 is a layer that essentially contains a negative electrode active material. The negative electrode active material is not particularly limited as long as it is capable of intercalating and releasing a charge transfer medium. For example, in the case of a lithium-ion battery, lithium titanate (Li4Ti5O) is used. 12 Examples of negative electrode active materials include lithium transition metal oxides such as ), transition metal oxides such as TiO2, Nb2O3, and WO3, metal sulfides, metal nitrides, and carbon materials such as graphite, soft carbon, and hard carbon, as well as metallic lithium, metallic indium, and lithium alloys. The negative electrode active material may be in powder form or thin film form. The negative electrode active material layer 212 may contain a conductive additive and a binder to improve conductivity in addition to the negative electrode active material. For the conductive additive and binder, materials generally used in solid-state batteries can be used.

[0023] (Middle class) The intermediate layer 213 is a layer laminated between the negative electrode active material layer 212 and the solid electrolyte layer 23. By providing the intermediate layer 213, it is possible to suppress the non-uniform deposition of metal between the negative electrode active material layer 212 and the solid electrolyte layer 23. The intermediate layer 213 is not particularly limited as long as it is a layer that has both electronic and ionic conductivity, and materials generally used in solid-state batteries can be used.

[0024] (solid electrolyte layer) The solid electrolyte layer 23 is a layer containing at least a solid electrolyte material. Charge transfer between the positive electrode active material and the negative electrode active material can be conducted via the solid electrolyte material contained in the solid electrolyte layer.

[0025] The solid electrolyte material is not particularly limited as long as it has charge transfer medium conductivity, i.e., ionic conductivity, but examples include sulfide solid electrolyte materials, oxide solid electrolyte materials, nitride solid electrolyte materials, and halide solid electrolyte materials.

[0026] Examples of sulfide solid electrolyte materials include Li2S-P2S5 and Li2S-P2S5-LiI in lithium-ion batteries. The term "Li2S-P2S5" above refers to a sulfide solid electrolyte material made using a raw material composition containing Li2S and P2S5.

[0027] Examples of oxide solid electrolyte materials include NASICON-type oxides, garnet-type oxides, and perovskite-type oxides in lithium-ion batteries. Examples of NASICON-type oxides include oxides containing Li, Al, Ti, P, and O (e.g., Li 1.5 Al 0.5 Ti 1.5 Examples of garnet-type oxides include those containing Li, La, Zr, and O (e.g., Li7La3Zr2O). 12 Examples of perovskite-type oxides include those containing Li, La, Ti, and O (e.g., LiLaTiO3).

[0028] (Positive electrode layer) The positive electrode current collector 221 is not particularly limited as long as it has the function of collecting current from the positive electrode layer, and examples include aluminum, aluminum alloy, stainless steel, nickel, iron, and titanium, with aluminum, aluminum alloy, and stainless steel being preferred. The shape of the positive electrode current collector can be, for example, foil-shaped or plate-shaped. The positive electrode current collector 221 is electrically connected to the positive electrode terminal 22 in Figure 2.

[0029] The positive electrode active material layer 222 is a layer containing at least a positive electrode active material. The positive electrode active material contained in the positive electrode active material layer 222 can be the same as that used in the positive electrode layer of a general solid-state battery, and is not particularly limited. For example, in the case of a lithium-ion battery, examples include lithium-containing layered active material, spinel-type active material, olivine-type active material, etc. Specific examples of positive electrode active materials include lithium cobalt oxide (LiCoO2), lithium nickel oxide (LiNiO2), LiNi p Mnq Co r O2 (p + q + r = 1), LiNi p Al q Co r O2 (p + q + r = 1), lithium manganate (LiMn2O4), heteroatom-substituted Li-Mn spinel represented by Li1+xMn2-x-yMyO4 (x + y = 2, M is at least one selected from Al, Mg, Co, Fe, Ni, and Zn), lithium titanate (oxide containing Li and Ti), lithium metal phosphate (LiMPO4, M is at least one selected from Fe, Mn, Co, and Ni), etc.

[0030] From the viewpoint of improving the charge transfer medium conductivity, the positive electrode active material layer 222 may optionally contain a solid electrolyte. Further, it may contain a binder, a conductive aid, etc. As these materials, those generally used in solid batteries can be used.

[0031] [Outer package] The outer packages 41 and 42 are composed of a laminate film and house the electrode laminate 2. The laminate film has, for example, a multilayer structure in which a heat-sealable resin layer such as polyolefin is laminated on the surface of a metal layer made of aluminum, stainless steel (SUS), etc. In addition to the above, the laminate cell may have a layer made of a polyamide such as nylon, a polyester such as polyethylene terephthalate, an adhesive layer made of an arbitrary laminate adhesive, etc.

[0032] In the present embodiment, the outer package consists of outer packages 41 and 42 which are two laminate films. The electrode laminate 2 is disposed between the two outer packages 41 and 42, and the electrode laminate 2 and the insulating members 31 and 32 are sealed by welding portions j1 and j2 formed by welding the outer packages 41 and 42.

[0033] [Insulating member] As shown in Figures 1 and 2, the insulating members 31 and 32 are positioned inside the outer casings 41 and 42, in contact with the laminated end faces of the electrode laminate 2. By covering the laminated end faces of the electrode laminate 2 with the insulating members 31 and 32, damage to the electrode laminate 2 can be prevented, and the insulation of the laminated end faces of the electrode laminate 2 can be ensured. Furthermore, the insulating members 31 and 32 according to this embodiment suppress the occurrence of wrinkles and cracks in the outer casings 41 and 42. In addition, it becomes possible to weld the welded parts j1 and j2 more reliably.

[0034] The materials constituting the insulating members 31 and 32 are not particularly limited as long as they are insulating materials, but from the viewpoint of ease of processing and arrangement, it is preferable to use insulating resin as the material. Examples of insulating resins include fluororubber, silicone rubber, styrene-butadiene rubber, and acrylic resin.

[0035] The insulating members 31 and 32 are provided so as to be in contact with at least one of the laminated end faces of the electrode laminate 2. Here, Figure 1 shows a cross-sectional view AA of Figure 2. In this embodiment, the insulating members 31 and 32 are arranged so as to be in contact with the four laminated end faces of the electrode laminate 2, which is substantially rectangular in shape from the viewpoint of Figure 2 (viewpoint from the lamination direction), excluding the laminated end faces from which the negative electrode terminal 21 and positive electrode terminal 22 extend. The laminated end faces of the electrode laminate 2 covered by the insulating members are not limited to the above, but it is preferable that at least two of the two laminated end faces other than the laminated end faces from which the negative electrode terminal 21 and positive electrode terminal 22 extend are the faces that mainly require ensuring welding strength and insulation, and also because the arrangement of the insulating members is easy.

[0036] The insulating members 31 and 32 have inclined surfaces that, in addition to the surfaces that abut the laminated end faces of the electrode laminate 2, are inclined in a cross-sectional view along the lamination direction L toward the welded portions j1 and j2, which are on the outside of the electrode laminate 2. These inclined surfaces are inclined toward the welded portions j1 and j2 from one end and the other end of the surface that abuts the laminated end faces of the electrode laminate 2 in Figure 1, respectively. Because the insulating members 31 and 32 have such inclined surfaces, the laminate-type solid battery 1 can be constructed without forming any corners of 90° or less in a cross-sectional view along the lamination direction L at the laminated end faces. That is, the angle r1 between the inclined surface and the laminated surface of the electrode laminate 2 is greater than 90° and less than 180°.

[0037] Here, the configuration of a conventional laminate-type solid battery 1g will be described with reference to Figure 9. As shown in Figure 9, the laminated end faces of the electrode laminate 2 of the laminate-type solid battery 1g are in contact with and covered by insulating members 31g and 32g. Unlike the insulating members 31 and 32 according to this embodiment, the insulating members 31g and 32g do not have inclined surfaces that slope toward the welded portions j1 and j2, and an angle r6 of approximately 90° is formed at the laminated end face in a cross-sectional view along the lamination direction L. That is, the insulating members 31g and 32g have a roughly rectangular prism shape in three dimensions, and corners c6 are formed on the insulating members 31g and 32g. Stress is concentrated at the above corners c6 when the laminate film is sealed, so wrinkles and cracks may occur at the corners c6 of the outer casing 41g and 42g, or between the corners c6 and the welded portion j1.

[0038] The insulating members 31 and 32 according to this embodiment can reduce the stress applied to the corners formed on the laminated end faces when sealing the laminate film. Therefore, the occurrence of wrinkles and cracks in the outer casings 41 and 42 during the manufacturing of the laminate-type solid battery 1 is suppressed. In addition, the stress applied to the welded parts j1 and j2 during sealing can also be reduced, thereby reducing welding defects in the welded parts j1 and j2.

[0039] In Figure 1, the angle between the inclined surface and the stacked surface of the electrode stack 2 is all shown as r1. However, r1 only needs to be greater than 90° and less than 180°, and multiple r1s may have different angles from each other.

[0040] In this embodiment, the insulating members 31 and 32 have a triangular shape in cross-sectional view along the stacking direction L, consisting of an edge that abuts the electrode stack 2 and two other edges. Therefore, the insulating members 31 and 32 have a roughly triangular prism shape in three dimensions, and corners c1 are formed at both ends of the surfaces of the insulating members 31 and 32 that abut the electrode stack 2.

[0041] [Manufacturing method for laminated solid-state batteries] The manufacturing method of the laminate-type solid battery 1 according to this embodiment includes the steps of forming an electrode stack 2, forming insulating members 31 and 32, arranging the electrode stack 2 and insulating members 31 and 32 between outer casings 41 and 42, welding the outer casings together at welding portions j1 and j2, and sealing the electrode stack 2 and insulating members 31 and 32 inside the outer casings 41 and 42.

[0042] The process of forming the electrode laminate 2 may include the steps of: forming a laminate unit (laminated units 2a, 2b, 2c in Figure 3) by laminating a set of laminated structures, as shown in Figure 3, in which a negative electrode layer, an intermediate layer 213, a solid electrolyte layer 23, and a positive electrode layer are laminated in this order, with a double-sided coated positive electrode layer having positive electrode active material layers 222 formed on both sides of a single positive electrode current collector 221, sandwiched between two negative electrode layers via the intermediate layer 213 and the solid electrolyte layer 23; cutting the laminate unit to a predetermined size; and laminating a plurality of laminate units having the predetermined size. This makes it possible to suppress lamination misalignment compared to the case where each layer constituting the electrode laminate 2 is formed and laminated separately. As a result, lamination misalignment can be easily suppressed within the area where the insulating members 31 and 32 are placed.

[0043] The process of forming the insulating members 31 and 32 may, for example, involve placing the electrode laminate 2 inside a frame that corresponds to the shape of the electrode laminate 2 and the insulating members 31 and 32, filling the gaps with insulating resin or other materials that constitute the insulating members 31 and 32, allowing them to harden, and then removing the frame.

[0044] The process of placing the electrode laminate 2 and insulating members 31 and 32 between the outer casings 41 and 42 and sealing the outer casings together by welding at the welding portions j1 and j2 is not particularly limited, but a known method such as a heat sealing method can be used.

[0045] Next, a laminate-type solid battery according to another embodiment of the present invention will be described. Hereinafter, components similar to those in the first embodiment will be denoted by the same reference numerals in the drawings, and their descriptions may be omitted.

[0046] <Second Embodiment> As shown in Figure 4, the laminate-type solid battery 1a according to this embodiment has inclined surfaces that slope toward the welded portions j1 and j2, which are the external sides of the electrode stack 2. The inclined surfaces consist of two inclined surfaces formed between the electrode stack 2 and the welded portions j1 and j2, respectively. Of the two inclined surfaces, the angle r2 between the inclined surface on the electrode stack 2 side and the stacked surface of the electrode stack 2 is greater than 90° and less than 180°. The angle r3 between the two inclined surfaces is greater than 90° and less than 180°. By providing the two inclined surfaces, the angle between the inclined surface and the stacked surface of the electrode stack 2 can be further increased without changing the distance between the electrode stack 2 and the welded portions j1 and j2. Therefore, the same effects as the laminate-type solid battery 1 according to the first embodiment can be preferably obtained with the above configuration. The number of inclined surfaces formed between the electrode stack 2 and the welded portions j1 and j2 may be three or more.

[0047] The insulating members 31a and 32a according to the second embodiment have a pentagonal shape in a cross-sectional view along the stacking direction L, consisting of an edge that abuts the electrode stack 2 and four other edges. Therefore, the insulating members 31a and 32a have a roughly pentagonal prism shape in three dimensions, and corners c2 are formed at both ends of the surface of the insulating members 31a and 32a that abuts the electrode stack 2. Corners c3 are formed between the inclined surfaces of the insulating members 31a and 32a.

[0048] <Third Embodiment> As shown in Figure 5, the laminate-type solid battery 1b according to this embodiment has inclined surfaces that slope toward the welded portions j1 and j2 on the outside side from the electrode stack 2. Similar to the laminate-type solid battery 1a according to the second embodiment, these inclined surfaces consist of two inclined surfaces formed between the electrode stack 2 and the welded portions j1 and j2, respectively. Of the two inclined surfaces, the angle r4 between the inclined surface on the electrode stack 2 side and the stacked surface of the electrode stack 2 is greater than 90° and less than 180°. The angle r5 between the two inclined surfaces is greater than 180°. The same effects as the laminate-type solid battery 1 according to the first embodiment can be obtained with the above configuration.

[0049] The insulating members 31b and 32b according to the third embodiment have a substantially concave pentagonal shape in a cross-sectional view along the stacking direction L, consisting of an edge that abuts the electrode stack 2 and four other edges. Therefore, the insulating members 31b and 32b have a substantially concave pentagonal prism shape in three dimensions, and corners c4 are formed at both ends of the surfaces of the insulating members 31b and 32b that abut the electrode stack 2. Corners c5 are formed between the inclined surfaces of the insulating members 31b and 32b.

[0050] <Fourth Embodiment> As shown in Figure 6, the laminate-type solid battery 1c according to this embodiment has an inclined surface that slopes toward the welded portions j1 and j2 on the outside side from the electrode stack 2. In this embodiment, the inclined surface is entirely composed of curved surfaces. Only a part of the inclined surface may be formed as a curved surface. The angle between the inclined surface and the stack surface of the electrode stack 2 is defined by the angle r6 between the stack surface T1 and the contact surface T2 at an arbitrary contact position of the curved surface that is the inclined surface, as shown in Figure 6. Regardless of where the contact position is on the curved surface, r6 is greater than 90° and less than 180°. The same effects as the laminate-type solid battery 1 according to the first embodiment can be obtained with the above configuration.

[0051] The insulating members 31c and 32c according to the fourth embodiment have a substantially semicircular shape in a cross-sectional view along the stacking direction L, consisting of an edge that abuts the electrode stack 2 and a curved surface other than the above. Therefore, the insulating members 31c and 32c have a substantially semi-cylindrical shape in three dimensions.

[0052] <Fifth Embodiment> As shown in Figure 6, the laminate-type solid battery 1d according to this embodiment has an inclined surface that slopes toward the welded portions j1 and j2 on the outside side from the electrode stack 2. The inclined surface is the same as that of the laminate-type solid battery 1 according to the first embodiment.

[0053] The laminate-type solid battery 1d according to this embodiment has insulating members 31d and 32d. Inside the outer casings 41 and 42, an absorbent material 5 is placed between the insulating members 31d and 32d and the welded parts j1 and j2. The absorbent material 5 is an H2S absorbent and / or an H2O absorbent. If a sulfide-based solid electrolyte material were used as the solid electrolyte material, and water were to penetrate into the outer casings 41 and 42, the sulfide-based solid electrolyte material would react with the water to generate hydrogen sulfide, which could cause the outer casings 41 and 42 to expand and break. The absorbent material 5 can absorb water that has entered from the outside or hydrogen sulfide that has been generated, thus preventing the above situation.

[0054] <Sixth Embodiment> As shown in Figure 8, the outer casing of the laminate-type solid battery 1e according to this embodiment consists of a single outer casing 41e. One end face of the electrode stack 2 is covered with an insulating member 32 and welded at the welding portion j1. The other end face of the electrode stack 2 is covered with an insulating member 31e. The laminate-type solid battery 1e has an inclined surface that slopes outward from the electrode stack 2, similar to the above embodiment. The above configuration also provides the same effects as the laminate-type solid battery 1 according to the first embodiment.

[0055] In the sixth embodiment, the insulating member 31e that abuts the laminated end face on the side where the welded portion j1 ​​is not formed has an edge that abuts the electrode laminate 2, two inclined surfaces that slope outward from the electrode laminate 2, and a flat portion formed between the two inclined surfaces. The flat portion is a plane along the lamination direction L. Because the insulating member 31e has a plane along the lamination direction L, it becomes possible to form the outer casing with a single outer casing 41e. Furthermore, since the outer casing 41e also has a plane 41f along the flat portion, as shown in Figure 8, the plane 41f can be placed in contact with the module component 61, so that a solid battery module can be easily constructed using the laminate-type solid battery 1e.

[0056] <Seventh Embodiment> [Solid-state battery module] Next, the configuration of the solid battery module 10 formed by stacking multiple laminate-type solid batteries 1f according to this embodiment will be described with reference to Figure 10. As shown in Figure 10, the solid battery module 10 includes multiple laminate-type solid batteries 1f arranged along the stacking direction, separators 7 placed between the laminate-type solid batteries 1f, a heat transfer material 61 as a module component, and a lower plate 62. The configuration of the laminate-type solid battery 1f is the same as that of the laminate-type solid battery 1b, except that the outer casing consists of a single outer casing 41h. The separator 7 has an insulating function that electrically and physically separates the laminate-type solid batteries 1f from each other. In addition to the insulating function, the separator 7 may also have a buffering function or a heat transfer function.

[0057] Holes 61a and 62a are formed in the heat transfer material 61 and the lower plate 62, corresponding to the shape of the insulating member 32b of the laminate-type solid battery 1f. Since the outer casing 41h does not have a welded portion on the side where the insulating member 32b is placed, multiple laminate-type solid batteries 1f can be easily fixed by inserting the end faces of the laminate-type solid batteries 1f on the side where the insulating member 32b is placed into the holes 61a and 62a, which are shaped to match the insulating member 32b.

[0058] Although preferred embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and any modifications or improvements that can achieve the objectives of the present invention are included in the present invention. [Explanation of symbols]

[0059] 1, 1a, 1b, 1c, 1d, 1e, 1f Laminated Solid-State Battery 2-electrode stack 31, 31a, 31b, 31e, 32, 32a, 32b Insulating material 41, 41a, 41b, 41c, 41e, 41f, 41h Exterior 42, 42a, 42b, 42c Outer casing

Claims

1. A laminate-type solid battery comprising an electrode stack and an outer casing made of a laminate film that houses the electrode stack, An insulating member is placed inside the outer casing that contacts at least one of the laminated end faces of the electrode laminate. The insulating member has an inclined surface that slopes outward from the electrode stack when viewed in cross-section along the stacking direction, The angle between the inclined surface and the laminated surface of the electrode laminate is greater than 90° and less than 180°. The aforementioned exterior is made of a single laminate film, A laminate-type solid battery, wherein the insulating member that abuts the laminate end face of the electrode stack on the side where the welding portion of the outer casing is not formed has a flat portion on the end face opposite to the side that abuts the electrode stack, along the lamination direction of the electrode stack.

2. A laminate-type solid battery comprising an electrode stack and an outer casing made of a laminate film that houses the electrode stack, An insulating member is placed inside the outer casing that contacts at least one of the laminated end faces of the electrode laminate. The insulating member has an inclined surface that slopes outward from the electrode stack when viewed in cross-section along the stacking direction, The angle between the inclined surface and the laminated surface of the electrode laminate is greater than 90° and less than 180°. The exterior body has a welded portion, A laminate-type solid battery in which an H₂O absorbent is placed between the insulating member and the welded portion inside the outer casing.

3. The laminate-type solid battery according to claim 1 or 2, wherein the inclined surface consists of a plurality of inclined surfaces.

4. The laminate-type solid battery according to claim 1 or 2, wherein the inclined surface has a curved surface.

5. The exterior body has a welded portion, Inside the outer casing, between the insulating member and the welded portion, H ２ S absorbent material and / or H ２ A laminate-type solid battery according to claim 1, wherein an oxygen-absorbing material is arranged.

6. The aforementioned exterior is made of a single laminate film, The laminate-type solid battery according to claim 2, wherein the insulating member that abuts the laminate end face of the electrode laminate on the side of the outer casing where the welded portion is not formed has a flat portion along the lamination direction of the electrode laminate.

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