Battery

Abstract

This battery comprises: a power generation element including a positive electrode layer, a negative electrode layer, and a solid electrolyte layer located between the positive electrode layer and the negative electrode layer; a structure located above a first main surface of the power generation element and having an insulating property; and a laminated film accommodating the power generation element and the structure, wherein a void is located between the first main surface and the laminated film so as to be in contact with the structure.

Description

[Technical Field]

[0001] The present disclosure relates to batteries. [Background technology]

[0002] Batteries such as lithium-ion secondary batteries are used as in-vehicle batteries, and in-vehicle batteries are required to have high capacity, improved safety, lighter weight, and smaller size.

[0003] Conventional batteries, such as lithium-ion secondary batteries, that use organic electrolyte solutions have the risk of fire, explosion, and ignition due to leakage. Therefore, in order to improve safety, all-solid-state secondary batteries (hereinafter referred to as all-solid-state batteries), which use solid electrolytes instead of organic electrolyte solutions, have been attracting attention.

[0004] While conventional automotive batteries are generally housed in a metal can with a metal plate as the exterior, there has been ongoing research into the use of laminated films made of metal foil and resin as the exterior to reduce weight and size.

[0005] Patent Document 1 discloses an all-solid-state battery in which a power generating element is housed in a laminate film. Patent Document 2 discloses a battery in which a power generating element and a pair of housings having side walls extending in the thickness direction of the power generating element are housed in a laminate film. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent No. 5648747 [Patent Document 2] Japanese Patent Application Publication No. 2019-57436 Summary of the Invention [Problem to be solved by the invention]

[0007] In conventional batteries, it has been difficult to peel off the laminate film safely and efficiently. Therefore, an object of the present disclosure is to provide a battery from which the laminate film can be peeled off safely and efficiently. [Means for solving the problem]

[0008] A battery according to a positional aspect of the present disclosure includes a power generating element including a positive electrode layer, a negative electrode layer, and a solid electrolyte layer located between the positive electrode layer and the negative electrode layer, an insulating structure located above a first main surface of the power generating element, and a laminate film that houses the power generating element and the structure, and a gap is located between the first main surface and the laminate film so as to contact the structure. [Effects of the Invention]

[0009] According to the present disclosure, it is possible to provide a battery from which a laminate film can be peeled off safely and efficiently. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a plan view of a battery according to a first embodiment. [Figure 2] FIG. 2 is a cross-sectional view showing a cross section of the battery taken along line II-II in FIG. [Figure 3] FIG. 3 is a cross-sectional view illustrating the relationship between the power generating element and the plurality of structures of the battery according to the first embodiment and the tensile elongation of the laminate film. [Figure 4] FIG. 4 is a cross-sectional view showing a cross section of the battery taken along line IV-IV in FIG. [Figure 5] FIG. 5 is a cross-sectional view illustrating an example of the relationship between the power generating element and a plurality of structures of the battery according to the first modification of the first embodiment and the tensile elongation of the laminate film. [Figure 6] FIG. 6 is a cross-sectional view illustrating another example of the relationship between the power generating element and the plurality of structures of the battery according to the first modification of the first embodiment and the tensile elongation of the laminate film. [Figure 7]FIG. 7 is a plan view of a battery according to Modification 2 of Embodiment 1. FIG. [Figure 8] FIG. 8 is a cross-sectional view of the battery according to the second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0011] (Findings that led to one aspect of the present disclosure) The present inventors have found that when a battery, particularly an all-solid-state battery, is sealed with an exterior body such as a laminate film, the following problems arise.

[0012] In the sealing process of conventional battery manufacturing methods, it is necessary to remove moisture and other substances from the laminate film as much as possible, to minimize the volume of the battery, and to ensure that the exterior body adheres closely to the power-generating element. To achieve this, in the sealing process, the power-generating element is enclosed in the laminate film under reduced pressure, and the laminate film on which the power-generating element is placed is sealed by thermocompression or the like. After the laminate film is sealed, if the laminate film containing the power-generating element is placed under atmospheric pressure, the laminate film adheres closely to the power-generating element due to the difference between the pressure inside the laminate film and the atmospheric pressure.

[0013] Conventional batteries are used by repeatedly charging and discharging the laminate film in close contact with the power generating element. When the battery is no longer capable of sufficient charging and discharging during use, it is discarded. When discarded, the laminate film must be peeled off from the power generating element.

[0014] However, because the laminate film adheres to the power generating element due to the difference between the pressure inside the laminate film and the atmospheric pressure, electric sparks may occur due to peeling electrification or frictional electrification that occurs when the laminate film is peeled off, which may cause delays in the separation work, injury to workers during the separation work, or fires in dry conditions.

[0015] In other words, in conventional batteries, after undergoing a laminate film sealing process under reduced pressure, when the battery is placed under atmospheric pressure, the laminate film becomes tightly attached to the power generating element, which poses a problem of low safety when peeling off the laminate film, for example, when disposing of the battery.

[0016] Furthermore, in conventional batteries, the laminate film is in close contact with the power generating element, which makes it difficult to peel the laminate film from the power generating element, and this has been a problem in that this is difficult to do efficiently.

[0017] In view of the above problems, an object of the present disclosure is to provide a battery from which a laminate film can be peeled off safely and efficiently.

[0018] An outline of one aspect of the present disclosure is as follows.

[0019] A battery according to one embodiment of the present disclosure includes a power generating element including a positive electrode layer, a negative electrode layer, and a solid electrolyte layer located between the positive electrode layer and the negative electrode layer; an insulating structure located above a first main surface of the power generating element; and a laminate film that houses the power generating element and the structure, and a gap is located between the first main surface and the laminate film so as to contact the structure.

[0020] As a result, in the region where the voids are located, the laminate film and the power generating element are not in close contact with each other, so peeling electrification or frictional electrification is unlikely to occur when the laminate film is peeled off, thereby realizing a battery in which the laminate film can be safely peeled off.

[0021] Furthermore, when the laminate film is peeled off from the power-generating element, if a portion of the void is opened to the atmosphere and air enters the void, the entire void will be at the same pressure as atmospheric pressure. The atmospheric pressure of the air that has entered the void presses the laminate film, making it easier for the laminate film and the power-generating element to be released from their tight contact state due to atmospheric pressure. As a result, a battery is realized in which the laminate film can be efficiently peeled off from the power-generating element.

[0022] In summary, it is possible to provide a battery from which the laminate film can be peeled off safely and efficiently.

[0023] Furthermore, for example, a battery according to an embodiment of the present disclosure may include a plurality of the structures, and the gap may be located between two adjacent structures among the plurality of structures.

[0024] This results in a larger area where the voids are located. In other words, in the larger area where the voids are located, the laminate film and the power-generating element are not in close contact with each other, making it less likely that peel electrification or frictional electrification will occur when the laminate film is peeled off. This results in a battery in which the laminate film can be peeled off more safely.

[0025] Furthermore, for example, each of the plurality of structures may have a rectangular parallelepiped shape.

[0026] As a result, the laminate film contacts the multiple structures, for example, on one side of each rectangular parallelepiped of the multiple structures. Therefore, when the laminate film is sealed, excessive pressure is unlikely to be applied to the contact points between the laminate film and the multiple structures, and damage to the laminate film is suppressed. In other words, a highly reliable battery is realized.

[0027] Furthermore, for example, the plurality of structures may have convex curved surfaces that protrude toward the laminate film.

[0028] As a result, the laminate film contacts, for example, the convex curved surfaces of the plurality of structures. Therefore, when the laminate film is sealed, excessive pressure is unlikely to be applied to the contact points between the laminate film and the plurality of structures, and damage to the laminate film is suppressed. In other words, a highly reliable battery is realized.

[0029] Furthermore, for example, the plurality of structures may be arranged in a matrix when the power generating element is viewed from above.

[0030] As a result, the gaps between two adjacent structures are connected in a lattice pattern in plan view. Therefore, when the laminate film is peeled off from the power-generating element, if some of the gaps are exposed to the atmosphere, a wider area of the lattice pattern will be exposed to atmospheric pressure, resulting in more efficient peeling of the laminate film from the power-generating element.

[0031] Furthermore, for example, the plurality of structures may be arranged in a stripe pattern and spaced apart from one another.

[0032] As a result, the plurality of structures are arranged in a stripe pattern, and the voids are also arranged in a stripe pattern. Therefore, when the laminate film is peeled off from the power-generating element, if some of the voids are exposed to the atmosphere, the pressure in a wider stripe pattern becomes the same as atmospheric pressure, and as a result, the laminate film is peeled off from the power-generating element more efficiently.

[0033] Furthermore, for example, in a battery according to one embodiment of the present disclosure, when a creepage distance, which is a length along the first main surface and the surfaces of the plurality of structures in a direction parallel to the first main surface, is denoted by X, a length of the power-generating element in the direction is denoted by L, and a tensile elongation of the laminate film is denoted by Elf,

number

[0034] As a result, even when the laminate film is placed under atmospheric pressure after being sealed, the laminate film adheres to the multiple structures, but a gap is formed between the first main surface and the laminate film, making it difficult for part of the laminate film to adhere to the power-generating element. In other words, for a battery in which the power-generating element is enclosed in the laminate film, forming a gap between two adjacent structures allows the laminate film to be peeled off more safely and efficiently.

[0035] Furthermore, for example, the solid electrolyte layer may be a solid electrolyte layer containing a solid electrolyte having lithium ion conductivity.

[0036] This allows the laminate film to be peeled off safely and efficiently in a battery containing a solid electrolyte having lithium ion conductivity.

[0037] Furthermore, for example, the battery according to one aspect of the present disclosure may further include a plurality of structures located on a second main surface of the power generating element that faces away from the first main surface.

[0038] This provides a gap on both the first and second main surfaces, thereby providing a battery from which the laminate film can be peeled off more safely and efficiently.

[0039] Hereinafter, embodiments will be described with reference to the drawings.

[0040] The embodiments described below are all comprehensive or specific examples. The numerical values, shapes, materials, components, component placement and connection configurations, manufacturing processes, and the order of manufacturing processes shown in the following embodiments are merely examples and are not intended to limit the present disclosure. Furthermore, among the components in the following embodiments, components not described in the independent claims are described as optional components.

[0041] Furthermore, each figure is a schematic diagram and is not necessarily an exact illustration. Therefore, for example, the scales of the figures do not necessarily match. Furthermore, in each figure, substantially the same components are given the same reference numerals, and redundant explanations are omitted or simplified.

[0042] Furthermore, in this specification, terms indicating the relationship between elements, such as parallel or perpendicular, terms indicating the shape of elements, such as rectangular or circular, and numerical ranges are not expressions that only express a strict meaning, but are expressions that also include a substantially equivalent range, for example, a difference of about a few percent.

[0043] In addition, in this specification, "plan view" means a plan view of the power generating element, that is, a view of the battery along the stacking direction of the battery, and this view is referred to as a plan view.

[0044] Furthermore, in this specification, the terms "upper" and "lower" in the battery configuration do not refer to the upper direction (vertically upper) and lower direction (vertically lower) in absolute spatial recognition, but are used as terms defined by a relative positional relationship based on the stacking order in the stacked structure. Furthermore, the terms "upper" and "lower" are used not only when two components are arranged with a gap between them and another component is present between them, but also when two components are arranged closely together and the two components are in contact with each other.

[0045] In the present specification and drawings, the x-axis, y-axis, and z-axis represent the three axes of a three-dimensional Cartesian coordinate system. In each embodiment, the first main surface of the power generating element is parallel to the xy plane, and the direction perpendicular to the xy plane is the z-axis direction. In each embodiment described below, the positive direction of the z-axis may be referred to as the upward direction, and the negative direction of the z-axis may be referred to as the downward direction.

[0046] (Embodiment 1) [1. Battery Overview] First, an overview of the battery according to embodiment 1 will be described with reference to Fig. 1 and Fig. 2. Fig. 1 is a plan view of the battery 1 according to embodiment 1. Fig. 2 is a cross-sectional view showing the cut surface of the battery 1 taken along line II-II in Fig. 1.

[0047] 1 and 2, the battery 1 includes a power generating element 2, a laminate film 3, and a plurality of structures 7. In the battery 1, the power generating element 2 and the plurality of structures 7 are housed and sealed by the laminate film 3. The laminate film 3 includes a first laminate film 31, a second laminate film 32, and a sealing portion 5.

[0048] The plurality of structures 7 are located above the first main surface 201 of the power generating element 2, more specifically, between the first laminate film 31 and the power generating element 2. The plurality of structures 7 are indicated by dots in FIG. 1. The plurality of structures 7 are in contact with the first laminate film 31 above the plurality of structures 7. The void 8 is located between the first main surface 201 and the first laminate film 31 so as to be in contact with the plurality of structures 7. In this embodiment, the void 8 is provided between each of the plurality of structures 7.

[0049] In the region where the gap 8 is located, the first laminate film 31 is not in close contact with the power generating element 2, and therefore peel electrification or frictional electrification is unlikely to occur when the first laminate film 31 is peeled off. This achieves a battery 1 in which the first laminate film 31 can be safely peeled off.

[0050] Furthermore, when the first laminate film 31 is peeled off from the power-generating element 2, a portion of the void 8 is opened to the atmosphere, and air enters the void 8, causing the entire void 8 to have the same pressure as atmospheric pressure. The atmospheric pressure of the air that has entered the void 8 presses the first laminate film 31 in a direction away from the power-generating element 2, making it easier for the first laminate film 31 and the power-generating element 2 to be released from the state in which they are in close contact due to atmospheric pressure. As a result, the first laminate film 31 is efficiently peeled off from the power-generating element 2.

[0051] In summary, a battery 1 is realized in which the first laminate film 31 can be peeled off safely and efficiently.

[0052] [2. Configuration] Next, a more detailed configuration of the battery 1 according to this embodiment will be described. As shown in Fig. 2, the battery 1 according to this embodiment includes a power generating element 2 including a laminate including a positive electrode layer, a negative electrode layer, and a solid electrolyte layer, and a protective plate 6, a laminate film 3, and a plurality of structures 7. The battery 1 is, for example, an all-solid-state battery.

[0053] First, the power generating element 2 will be described.

[0054] The power generating element 2 has at least one battery cell 20 and a protective plate 6 .

[0055] The battery cell 20 has a structure in which a positive electrode layer, a solid electrolyte layer, and a negative electrode layer are stacked in this order. In this embodiment, the power generating element 2 includes only one battery cell. The battery cell 20 includes a first electrode layer 21, a second electrode layer 23, and a solid electrolyte layer 22. The first electrode layer 21 includes a first current collector 211 and a first active material layer 212. The first active material layer 212 is located between the first current collector 211 and the solid electrolyte layer 22. The second electrode layer 23 includes a second current collector 231 and a second active material layer 232. The second active material layer 232 is located between the second current collector 231 and the solid electrolyte layer 22.

[0056] In the following, an example will be described in which the first electrode layer 21 is a positive electrode layer and the second electrode layer 23 is a negative electrode layer. That is, the first current collector 211 is a positive electrode current collector, and the first active material layer 212 is a positive electrode active material layer. The second current collector 231 is a negative electrode current collector, and the second active material layer 232 is a negative electrode active material layer. That is, in this embodiment, the battery cell 20 has a structure in which a positive electrode current collector, a positive electrode active material layer, a solid electrolyte layer, a negative electrode active material layer, and a negative electrode current collector are stacked in this order.

[0057] The first electrode layer 21 may be a negative electrode layer, and the second electrode layer 23 may be a positive electrode layer. That is, the first current collector 211 may be a negative electrode current collector, and the first active material layer 212 may contain a negative electrode active material. The second current collector 231 may be a positive electrode current collector, and the second active material layer 232 may contain a positive electrode active material.

[0058] The first current collector 211, the first active material layer 212, the solid electrolyte layer 22, the second active material layer 232, and the second current collector 231 each have a rectangular shape in a plan view. The plan view shapes of the first current collector 211, the first active material layer 212, the solid electrolyte layer 22, the second active material layer 232, and the second current collector 231 are not particularly limited and may be square, or may be a shape other than a rectangle, such as a circle, an ellipse, or a polygon. In other words, the battery cell 20 in which the first current collector 211, the first active material layer 212, the solid electrolyte layer 22, the second active material layer 232, and the second current collector 231 are stacked will have the same shape as described above.

[0059] In this embodiment, the size of the rectangular battery cell 20 is, for example, 10 mm or more and 1000 mm or less in length in the x-axis direction, 10 mm or more and 1000 mm or less in length in the y-axis direction, and 1 mm or more and 100 mm or less in thickness (length in the z-axis direction). However, the size of the battery cell 20 is not limited to the above.

[0060] In the present embodiment, the first current collector 211, the first active material layer 212, the solid electrolyte layer 22, the second active material layer 232, and the second current collector 231 are all the same size and have the same outline in a plan view, but this is not limiting. For example, the first active material layer 212 may be smaller than the second active material layer 232. The first active material layer 212 and the second active material layer 232 may be smaller than the solid electrolyte layer 22.

[0061] Known conductive materials can be used as the material for the first current collector 211 and the second current collector 231. For the first current collector 211 and the second current collector 231, for example, a foil, plate, or mesh-like material made of copper, aluminum, nickel, iron, stainless steel, platinum, gold, or an alloy of two or more of these metals can be used.

[0062] The first active material layer 212, which is a positive electrode active material layer, contains at least a positive electrode active material. The first active material layer 212 may contain at least one of a solid electrolyte, a conductive additive, and a binding agent (i.e., a binder) as necessary.

[0063] The positive electrode active material may be a known material capable of absorbing and releasing (inserting and desorbing, or dissolving and depositing) lithium ions, sodium ions, or magnesium ions. Examples of the positive electrode active material capable of extracting and inserting lithium ions include lithium cobalt oxide composite oxide (LCO), lithium nickel oxide composite oxide (LNO), lithium manganese oxide composite oxide (LMO), lithium-manganese-nickel composite oxide (LMNO), lithium-manganese-cobalt composite oxide (LMCO), lithium-nickel-cobalt composite oxide (LNCO), and lithium-nickel-manganese-cobalt composite oxide (LNMCO).

[0064] As the solid electrolyte, known materials such as lithium ion conductors, sodium ion conductors, or magnesium ion conductors can be used. As the solid electrolyte, both inorganic solid electrolytes and polymer solid electrolytes (including gel-like solid electrolytes) can be used. As the inorganic solid electrolyte, for example, a sulfide solid electrolyte or an oxide solid electrolyte can be used.

[0065] As the sulfide solid electrolyte, for example, a composite of lithium sulfide (LiS) and diphosphorus pentasulfide (P5S5) is used in the case of a material capable of conducting lithium ions. Alternatively, sulfides such as LiS-SiS, LiS-B5S, or LiS-GeS may be used as the sulfide solid electrolyte. Alternatively, sulfides obtained by adding at least one of LiN, LiCl, LiBr, LiPO4, and LiSiO4 as an additive to the above sulfides may be used as the sulfide solid electrolyte.

[0066] As an oxide solid electrolyte, materials that can conduct lithium ions include, for example, Li7La3Zr2O 12 (LLZ), Li 1.3 Al 0.3 Ti 1.7 (PO4)3(LATP) or (La,Li)TiO3(LLTO) are used.

[0067] The conductive additive may be, for example, a conductive material such as acetylene black, carbon black, graphite, or carbon fiber, and the binder may be, for example, a bonding binder such as polyvinylidene fluoride.

[0068] The second active material layer 232, which is a negative electrode active material layer, contains at least a negative electrode active material. The second active material layer 232 may contain at least one of a solid electrolyte, a conductive additive, and a binder, as in the positive electrode active material layer, if necessary.

[0069] The negative electrode active material may be a known material capable of occluding and releasing (inserting and desorbing, or dissolving and precipitating) lithium ions, sodium ions, or magnesium ions. Examples of materials capable of occluding and inserting lithium ions include carbon materials such as natural graphite, artificial graphite, graphite carbon fiber, and resin-baked carbon, metallic lithium, lithium alloys, and oxides of lithium and transition metal elements.

[0070] The solid electrolyte layer 22 includes at least a solid electrolyte. The solid electrolyte layer 22 may include a binder, if necessary. The solid electrolyte layer 22 may include a solid electrolyte having lithium ion conductivity. The solid electrolyte and binder included in the solid electrolyte layer 22 may be the same as those described above.

[0071] The protective plate 6 is a protective member that prevents the battery cells 20 from being deformed and damaged. The protective plate 6 is preferably made of a member that is more rigid than the battery cells 20. The protective plate 6 is made of, for example, a conductive material such as metal, or an insulating material such as ceramic or resin. From the perspective of ease of processing into a shape, the protective plate 6 may be made of a conductive material such as metal. When the protective plate 6 is made of a conductive material such as metal, the protective plate 6 and the battery cells 20 are electrically insulated from each other by isolating them with an insulating member, or by coating the protective plate 6 or the battery cells 20 with an insulating layer.

[0072] The protective plate 6 is positioned so as to cover the entire upper surface of the battery cell 20. More specifically, the upper surface of the battery cell 20 is one surface of the second current collector 231, which is the surface opposite to the surface in contact with the second active material layer 232. As shown in FIG. 1 , the protective plate 6 has a rectangular shape in a plan view. The shape of the protective plate 6 in a plan view is not particularly limited, and may be a square, or a shape other than a rectangle, such as a circle, an ellipse, or a polygon, corresponding to the shape of the battery cell 20. The size of the protective plate 6 may be approximately the same as that of the battery cell 20, but is not limited to this. The protective plate 6 may also be smaller or larger than the battery cell 20.

[0073] The shape of the protective plate 6 is not limited to the above. The protective plate 6 may be shaped to cover two or more of the six faces of the rectangular parallelepiped battery cell 20. For example, if the protective plate 6 covers all six faces of the battery cell 20, the protective plate 6 functions as a housing that protects the battery cell 20.

[0074] In this embodiment, the first main surface 201 of the power generating element 2 is the upper surface of the protective plate 6. More specifically, the first main surface 201 is one surface of the protective plate 6, and is the surface opposite to the surface in contact with the second current collector 231. The second main surface 202 of the power generating element 2 is the surface facing away from the first main surface 201, and is one surface of the first current collector 211. More specifically, the second main surface 202 is one surface of the first current collector 211, and is the surface opposite to the surface in contact with the first active material layer 212.

[0075] Furthermore, the power generating element 2 does not need to have the protective plate 6. In this case, by increasing the thickness of the first current collector 211 and the thickness of the second current collector 231, it is possible to prevent the battery cell 20 from being damaged. In this case, the first main surface 201 is one surface of the second current collector 231, and is the surface opposite to the surface in contact with the second active material layer 232.

[0076] The power generating element 2 may have a plurality of stacked battery cells 20. The plurality of battery cells 20 may be stacked in any manner as long as they function as a battery, and may be stacked, for example, so as to be electrically connected in series or in parallel. The number of battery cells 20 included in the power generating element 2 may be two, or may be three or more, and is not particularly limited.

[0077] The plurality of battery cells 20 may have a structure in which adjacent battery cells 20 share a positive electrode current collector or a negative electrode current collector. In other words, the positive electrode layer or negative electrode layer included in one battery cell 20 does not need to include a current collector, and may include a positive electrode active material layer or negative electrode active material layer provided on the current collector of an adjacent battery cell 20. In the plurality of battery cells 20, the side surfaces of each layer may be covered with a sealing member made of a sealing resin or the like.

[0078] Next, the laminate film 3 composed of the first and second laminate films 31 and 32 will be described.

[0079] The laminate film 3 is a flexible film-shaped exterior body that houses the power generating element 2 and the plurality of structures 7. The laminate film 3 is provided to cover the surfaces of the power generating element 2 and the plurality of structures 7 and to protect the power generating element 2 from moisture, air, and the like. The laminate film 3 has a first laminate film 31, a second laminate film 32, and a sealing portion 5 where the first laminate film 31 and the second laminate film 32 are bonded together.

[0080] For example, after the laminate film 3 covers and houses the power generating element 2 and the plurality of structures 7 under reduced pressure, the pressure in the space outside the laminate film 3 increases to atmospheric pressure, causing the laminate film 3 to be stretched and adhere to the second main surface 202 and two side surfaces of the power generating element 2. However, when the plurality of structures 7 described below are located on the first main surface 201, the laminate film 3 (more specifically, the first laminate film 31) adheres to the top surfaces of the plurality of structures 7, but does not adhere to the entire surface of the first main surface 201, forming voids 8.

[0081] The laminate film 3 is a film having a laminated structure of a resin layer made of a resin such as a polyethylene resin or a polypropylene resin and a metal layer made of a metal such as aluminum, and a known laminate film can be used. The laminate film 3 has, for example, a three-layer structure in which a resin layer, a metal layer, and a resin layer are laminated in this order. As an example, the laminate film 3 has a three-layer structure of a 50 μm polyester layer, a 25 μm aluminum layer, and a 50 μm polyester layer, and has a thickness of 125 μm. The number of layers of the laminate film 3 is not limited to three, and a laminate film 3 with a number of layers depending on the specification and purpose can be used.

[0082] The sealing portion 5 is a portion where the respective ends of the first laminate film 31 and the second laminate film 32 are bonded together. In the present embodiment, the respective outer peripheral ends of the first laminate film 31 and the second laminate film 32 are tightly attached and sealed to form the sealing portion 5. The sealing portion 5 is provided, for example, in a ring shape surrounding the power generating element 2 in a plan view.

[0083] The laminate film 3 may be formed by folding a single laminate film. That is, a part of the single laminate film may be the first laminate film 31, and another part may be the second laminate film 32.

[0084] The thickness of each of the laminate films 3 is preferably 100 μm or more and 1000 μm or less. The tensile elongation of the laminate film 3 is measured in accordance with JIS-C-2151 and ASTM-D-882. The tensile elongation of the laminate film 3 is preferably 20% or more and 200% or less.

[0085] The laminate film 3 configured as described above serves as an exterior body that is highly flexible and has excellent barrier properties against air and moisture.

[0086] The multiple structures 7 are members located above the first main surface 201 of the power generating element 2. More specifically, the multiple structures 7 are located between the first main surface 201 and the first laminate film 31, and in contact with the first main surface 201 and the first laminate film 31. In other words, the multiple structures 7 are in contact with the second current collector 231 via the protection plate 6.

[0087] The shape of each of the multiple structures 7 is preferably such that they can be in contact with each other along the first main surface 201. As shown in FIG. 1 , the shape of each of the multiple structures 7 in a plan view is rectangular. Here, the shape of each of the multiple structures 7 is, for example, a rectangular parallelepiped, but other shapes are also possible. When each of the multiple structures 7 is a rectangular parallelepiped, the first laminate film 31 contacts the multiple structures 7 on one surface (here, the top surface) of each of the multiple structures 7. Therefore, when the laminate film 3 is sealed, excessive pressure is unlikely to be applied to the contact points between the first laminate film 31 and the multiple structures 7, and damage to the first laminate film 31 is suppressed. In other words, a highly reliable battery 1 is realized.

[0088] The size of the plurality of structures 7 is preferably, for example, but not limited to, 1 mm to 30 mm on a side. In addition, the length of the plurality of structures 7 in the height direction (z-axis direction) is preferably greater than the thickness of the laminate film 3.

[0089] Furthermore, the plurality of structures 7 may be fixed in close contact with the first laminate film 31 and the protective plate 6. For example, an adhesive layer (not shown) may be located between the plurality of structures 7 and the first laminate film 31 and the protective plate 6. In this way, the plurality of structures 7 may have sufficient adhesion to the protective plate 6 and the first laminate film 31, adhesive strength, and the like.

[0090] The plurality of structures 7 are arranged in a matrix in plan view, but are not limited to this. For example, the plurality of structures 7 may be arranged randomly in plan view. The spacing between the plurality of structures 7 is constant, but may also be random. The plurality of structures 7 are preferably arranged over the entire area of the first main surface 201 in plan view, but may also be arranged in a partial area of the first main surface 201.

[0091] In this embodiment, four structures 7 are arranged in the x-axis direction and three in the y-axis direction, and a total of 12 structures 7 are arranged in a matrix.

[0092] The plurality of structures 7 are insulating. The material of the plurality of structures 7 may be made of an insulating material. The plurality of structures 7 may be made of, for example, a resin, such as a polyimide resin. However, the material of the plurality of structures 7 is not limited to the above. For example, the material of the plurality of structures 7 may be a metal material. In this case, the periphery of the plurality of structures 7 may be insulated or coated with an insulating material. In this way, when the plurality of structures 7 have insulating properties, electrical defects (such as leaks or short circuits) of the battery 1 can be suppressed.

[0093] Furthermore, when the pressure is returned to atmospheric pressure after the laminate film 3 is sealed, an external force (i.e., a force in the direction toward the power generating element 2) is generated by the atmospheric pressure on the power generating element 2. For this reason, the multiple structures 7 should be made of a material that has sufficient hardness, strength, and elasticity to suppress deformation due to this external force.

[0094] In the present embodiment, the protective plate 6 and the plurality of structures 7 are different members, but this is not limiting. The protective plate 6 and the plurality of structures 7 may be a single member made of the same material and integrally molded using a mold or the like.

[0095] The void 8 is a space located between the first main surface 201 and the first laminate film 31 so as to contact the plurality of structures 7. In the present embodiment, the void 8 is a space surrounded by the plurality of structures 7, the first main surface 201, and the first laminate film 31. The position of the void 8 is not limited to the above. For example, the void 8 may be located above or below the plurality of structures 7. In this case, each of the plurality of structures 7 does not have to be a rectangular parallelepiped.

[0096] Although the detailed manufacturing method of the battery 1 will be described later, in the manufacturing method of the battery 1, after the laminate film 3 on which the power-generating element 2 is placed is sealed, the laminate film 3 is placed under atmospheric pressure. Because the multiple structures 7 are located above the first main surface 201, even when the laminate film 3 is placed under atmospheric pressure, the first laminate film 31 and the power-generating element 2 (more specifically, the first main surface 201 of the power-generating element 2) do not come into complete contact. In other words, peel electrification or frictional electrification is unlikely to occur in the area where the voids 8 are located. This realizes a battery 1 in which the first laminate film 31 can be safely peeled off. Furthermore, when the first laminate film 31 is peeled off from the power-generating element 2, a portion of the voids 8 is exposed to the atmosphere, allowing air to enter the voids 8, making it easier for the first laminate film 31 and the power-generating element 2 to be released from their close contact due to atmospheric pressure. As a result, the first laminate film 31 is efficiently peeled off from the power-generating element 2. In this embodiment, the battery 1 includes a plurality of structures 7, but similar effects can be expected even when a single structure 7 is included.

[0097] 1 and 2, a gap 8 is located between two adjacent structures 7 among the plurality of structures 7. In the present embodiment, the first laminate film 31 and the first main surface 201 are not in contact with each other between the two adjacent structures 7.

[0098] By providing a plurality of structures 7, the area in which the voids 8 are located becomes larger. In other words, in the larger area in which the voids 8 are located, the first laminate film 31 and the power generating element 2 are not in close contact with each other, so peel electrification or frictional electrification is less likely to occur when the first laminate film 31 is peeled off. This makes it possible to realize a battery 1 in which the first laminate film 31 can be peeled off more safely.

[0099] As described above, the plurality of structures 7 are arranged in a matrix in plan view, and therefore the voids 8 are arranged in a lattice shape in plan view. In other words, the voids 8 are formed by a plurality of spaces extending in the x-axis direction intersecting with a plurality of spaces extending in the y-axis direction.

[0100] As a result, when the first laminate film 31 is peeled off from the power-generating element 2, a portion of the void 8 is opened to the atmosphere, allowing air to enter the void 8, and the entire void 8 becomes pressurized to the same pressure as atmospheric pressure. The atmospheric pressure of the air that has entered the void 8 presses the first laminate film 31 in a direction away from the power-generating element 2, making it easier for the first laminate film 31 and the power-generating element 2 to be released from their tight contact state caused by atmospheric pressure. Because the void 8 is configured in a lattice pattern, when a portion of the void 8 is opened to the atmosphere, a wider area becomes pressurized to the same pressure as atmospheric pressure, and as a result, the first laminate film 31 is peeled off from the power-generating element 2 more efficiently.

[0101] In this embodiment, the first laminate film 31 and the first main surface 201 are not in contact between two adjacent structures 7 among the plurality of structures 7, but this is not limited to this, and a portion of the first laminate film 31 and a portion of the first main surface 201 may be in contact.

[0102] [3. Relationship between power generating elements and structures and tensile elongation of laminated film] Here, the relationship between the power generating element 2 and the plurality of structures 7 and the tensile elongation of the laminate film 3 will be described.

[0103] 3 is a cross-sectional view for explaining the relationship between the power generating element 2 and the plurality of structures 7 of the battery 1 according to embodiment 1 and the tensile elongation of the laminate film 3. More specifically, FIG. 3 is a cross-sectional view in which the laminate film 3 and the like in FIG. 2 are omitted.

[0104] Here, the creepage distance X is the length along the surfaces of the first main surface 201 and the multiple structures 7 in a direction parallel to the first main surface 201. The direction is not particularly limited, but may be along the first main surface 201 (i.e., the xy plane), and in FIG. 3, it is, for example, the positive x-axis direction. That is, the creepage distance X is the length along the surfaces of the first main surface 201 and the multiple structures 7 in the positive x-axis direction. More specifically, in FIG. 3, the creepage distance X is the length along the line indicated by the dashed line, and is the length along the surfaces of the first main surface 201 and the multiple structures 7 between one end p1 of the first main surface 201 and the other end p2 of the first main surface 201.

[0105] Furthermore, if the length of the power generating element 2 in the above direction (here, the positive x-axis direction) is L and the tensile elongation of the laminate film 3 is Elf (%), the creepage distance X, the length L, and the tensile elongation Elf satisfy equation (2).

[0106]

number

[0107] As a result, even when the laminate film 3 is sealed and placed under atmospheric pressure, the first laminate film 31 adheres closely to the multiple structures 7, but because a gap 8 is formed between two adjacent structures 7, a portion of the first laminate film 31 does not adhere easily to the power generating element 2. In other words, for a battery 1 in which the power generating element 2 is sealed in the laminate film 3, by forming a gap 8 between two adjacent structures 7, the first laminate film 31 can be peeled off more safely and efficiently.

[0108] Further, a more specific creepage distance will be described. For the sake of explanation, the creepage distance according to the first example of this embodiment is set to X1, and the creepage distance according to the second example is set to X2.

[0109] First, the creepage distance X1 according to the first example will be described with reference to Fig. 3. The creepage distance X1 is the creepage distance when the direction parallel to the first main surface 201 is the positive x-axis direction, as described above.

[0110] As shown in FIG. 3, the height (length in the z-axis direction) of the plurality of structures 7 is d vn (mm), and width (length in the x-axis direction) is d hn (mm) where the subscript n indicates the order of the structures 7 arranged in the positive direction of the x-axis.

[0111] Furthermore, the width (length in the x-axis direction) of the region above the first main surface 201 where the plurality of structures 7 are not located is defined as d whm The length of the power generating element 2 in the positive x-axis direction according to the first example is defined as L1 (mm). The subscript m indicates the order in which the above-mentioned regions are arranged in the positive x-axis direction. In this case, the creepage distance X1 satisfies the formula (3).

[0112]

number

[0113] For example, the length L1 of the power generating element 2 in the x-axis positive direction is 65 (mm), and hn Each of these is 10 (mm), d vn Each of the widths is 5 (mm), and the widths of the dwm are 5 (mm). As described above, four structures 7 are provided in the x-axis direction, and the tensile elongation of the laminate film 3 is 20%.

[0114] In this case, the creepage distance X1 is d hn The total is 40 (mm), d vn The total is 40 (mm), d whmThe sum of these is 25 (mm), so the total is 105 (mm). Furthermore, in the first example, calculation is performed using formula (2). In formula (2), X corresponds to X1 and L corresponds to L1. In this case, the left side is 105 (mm) and the right side is 78 (mm), so formula (2) is satisfied. As described above, the tensile elongation is between 20 (%) and 200 (%), so the size, shape, number and arrangement of the multiple structures 7 should be determined so as to satisfy formula (2).

[0115] Furthermore, as described above, the direction parallel to first main surface 201 is not limited to the positive x-axis direction, but may be the positive y-axis direction. In the second example, creepage distance X2 is the creepage distance when the direction parallel to first main surface 201 is the positive y-axis direction. Next, creepage distance X2 according to the second example will be described with reference to FIG. 4.

[0116] Fig. 4 is a cross-sectional view showing a cross section of the battery 1 taken along line IV-IV in Fig. 1. In Fig. 4, the creepage distance X2 is the length along the dashed line.

[0117] As shown in FIG. 4, the height (length in the z-axis direction) of the plurality of structures 7 is d vp (mm), and width (length in the y-axis direction) is d dp (mm). The subscript p indicates the order of the structures 7 arranged in the positive direction of the y-axis. The width (length in the y-axis direction) of the region above the first main surface 201 where the plurality of structures 7 are not located is defined as d wdq (mm). The subscript q indicates the order in which the above regions are arranged in the positive y-axis direction. Furthermore, the length of the power generating element 2 in the positive y-axis direction according to the second example is L2. In this case, the creepage distance X2 satisfies the formula (4).

[0118]

number

[0119] For example, the length L2 of the power generating element 2 in the y-axis positive direction is 55 (mm), and dp Each of these is 5 (mm), d vpEach of these is 5 (mm), d wdq As described above, three structures 7 are provided in the y-axis direction, and the tensile elongation of the laminate film 3 is 20%.

[0120] In this case, the creepage distance X2 is d dp The total is 15 (mm), d vp The total is 30 (mm), d wdq The total is 40 (mm), so it is 85 (mm). Furthermore, in the second example, calculation is performed using formula (2). X in formula (2) corresponds to X2, and L corresponds to L2. In this case, the left side is 85 (mm) and the right side is 66 (mm), so that formula (2) is satisfied. Furthermore, it is preferable to determine the size, shape, number, and arrangement of the multiple structures 7 so as to satisfy formula (2).

[0121] The creepage distances X, X1, and X2 were measured with an optical step gauge, but no steps of 2 mm or more were detected, and it was confirmed that a gap 8 was formed between two adjacent structures 7.

[0122] As explained above, the creepage distances X1 and X2 differ depending on the direction parallel to the first main surface 201. As mentioned above, the direction parallel to the first main surface 201 is not particularly limited, so it is sufficient that the creepage distance X1 satisfies formula (2) or the creepage distance X2 satisfies formula (2). Note that even if the direction parallel to the first main surface 201 is not the positive x-axis direction or the positive y-axis direction, it is sufficient that the creepage distance in this case satisfies formula (2).

[0123] As a result, even if the laminate film 3 is sealed and placed under atmospheric pressure, the first laminate film 31 adheres closely to the multiple structures 7, but because a gap 8 is formed between two adjacent structures 7, a portion of the first laminate film 31 does not adhere closely to the power generating element 2. In other words, for a battery 1 in which the power generating element 2 is sealed within the laminate film 3, by forming a gap 8 between two adjacent structures 7, the first laminate film 31 can be peeled off more safely and efficiently.

[0124] [4. Manufacturing method] Next, a method for manufacturing the battery 1 according to this embodiment will be described. Note that the method for manufacturing the battery 1 described below is an example, and the method for manufacturing the battery 1 is not limited to the following example.

[0125] First, the power generating element 2 is prepared. The power generating element 2 includes one or more battery cells 20. The battery cells 20 can be produced by a known method, such as by layering a positive electrode active material, a solid electrolyte, and a negative electrode active material on a current collector by coating them. The power generating element 2 including the multiple battery cells 20 may be formed by layering the multiple battery cells 20 so that they are connected in series or in parallel.

[0126] A protective plate 6 on which a plurality of structures 7 are located is fixed above the battery cells 20 included in the power generating element 2. In this case, as described above, a protective plate 6 on which a plurality of structures 7 are formed using a mold may be used, or a protective plate 6 on which a plurality of structures 7 are attached may be used.

[0127] Next, for example, a second laminate film 32 having a three-layer structure in which a resin layer, an aluminum layer and another resin layer are laminated in this order is prepared in a decompression chamber.

[0128] Furthermore, the power generating element 2 is placed above the second laminate film 32, and the first laminate film 31 is placed above the second laminate film 32, the power generating element 2, and the plurality of structures 7. In other words, the power generating element 2 and the plurality of structures 7 are sandwiched and covered by the two laminate films (the first and second laminate films 31 and 32).

[0129] Next, the ends of the first laminate film 31 and the second laminate film 32 are bonded together by thermocompression, with the exception of a portion, to form the sealing portion 5. In this way, the two laminate films are formed into a bag-shaped laminate film. In a decompression chamber, the external space of the bag-shaped laminate film containing the power generating element 2 is reduced in pressure, and in this reduced pressure state, the unbonded portions are thermocompression-bonded, thereby sealing the laminate film 3 containing the power generating element 2.

[0130] After sealing, the pressure inside the reduced pressure chamber is increased to atmospheric pressure, and the laminate film 3 is subjected to external forces such as airflow or atmospheric pressure, thereby adhering to the power generating element 2. In this way, the battery 1 shown in FIG. 1 is produced.

[0131] (First Modification of First Embodiment) Next, a battery according to Modification 1 of Embodiment 1 will be described.

[0132] FIG. 5 is a cross-sectional view illustrating an example of the relationship between the power generating element 2 and the plurality of structures 7a of the battery 1a according to the first modification of the first embodiment and the tensile elongation of the laminate film.

[0133] In this modification, the shapes of the plurality of structures 7a are different from those in the first embodiment.

[0134] Specifically, the battery 1a has the same configuration as the battery 1 according to the first embodiment, except that the plurality of structures 7a have convex curved surfaces that protrude toward the first laminate film (not shown). More specifically, the shape of each of the plurality of structures 7a is hemispherical. As a result, the first laminate film contacts the first laminate film, for example, at the convex curved surfaces of each of the plurality of structures 7a. Therefore, when the laminate film is sealed, excessive pressure is unlikely to be applied to the contact points between the first laminate film and the plurality of structures 7a, and damage to the first laminate film is suppressed. In other words, a highly reliable battery 1a is realized.

[0135] The shape of each of the plurality of structures 7a is not limited to the above, and may be a spherical notch or the like.

[0136] Here, the relationship between the power generating element 2 and the plurality of structures 7a and the tensile elongation of the laminate film will be explained using a third and fourth example of this modification. The creepage distance in the third example is designated X3, and the creepage distance in the fourth example is designated X4.

[0137] First, the creepage distance X3 according to the third example will be described with reference to Fig. 5. The creepage distance X3 is the creepage distance when the direction parallel to the first main surface 201 is the positive x-axis direction, as in the first example. More specifically, in Fig. 5, the creepage distance X3 is the length along the dashed line.

[0138] The length of the arc of the plurality of structures 7a shown in FIG. 5 is d shn (mm). The subscript n indicates the order of the structures 7a arranged in the positive direction of the x-axis. The width (length in the x-axis direction) of the region above the first main surface 201 where the structures 7a are not located is defined as d whm The length of the power generating element 2 in the positive x-axis direction in the third example is defined as L3 (mm). The subscript m indicates the order in which the above regions are arranged in the positive x-axis direction. In this case, the creepage distance X3 satisfies the formula (5).

[0139]

number

[0140] For example, the length L3 of the power generating element 2 in the x-axis positive direction is 65 (mm), the radius of the structure 7a is 5 (mm), and d shn Each of these is 15.7 mm (assuming pi is 3.14), whm Each of these is 5 (mm). As in the first embodiment, a total of 12 structures 7 are provided, 4 in the x-axis direction and 3 in the y-axis direction, totaling 4 × 3, and the tensile elongation of the laminate film is 20%.

[0141] In this case, the creepage distance X1 is d shn The total is 62.8 (mm), d whm The sum of these is 25 (mm), so the total is 87.8 (mm). Furthermore, in the third example, calculation is performed using formula (2). In this case, the left side is 87.8 (mm) and the right side is 78 (mm), so formula (2) is satisfied. Furthermore, the size, shape, number, and arrangement of the multiple structures 7a should be determined so as to satisfy formula (2).

[0142] Furthermore, as described above, the direction parallel to first main surface 201 is not limited to the positive x-axis direction, but may be the positive y-axis direction. In the fourth example, creepage distance X4 is the creepage distance when the direction parallel to first main surface 201 is the positive y-axis direction. Next, creepage distance X4 according to the fourth example will be described with reference to FIG. 6.

[0143] FIG. 6 is a cross-sectional view illustrating another example of the relationship between the power generating element 2 and the plurality of structures 7a of the battery 1a according to the first modification of the first embodiment and the tensile elongation of the laminate film.

[0144] In FIG. 6, the creepage distance X4 is the length along the dashed line.

[0145] The length of the arc of the plurality of structures 7a shown in FIG. 6 is d sdp The subscript p indicates the order of the structures 7a arranged in the positive direction of the y-axis. The width (length in the y-axis direction) of the region above the first main surface 201 where the structures 7a are not located is defined as d wdq (mm). The subscript q indicates the order in which the above regions are arranged in the positive direction of the y-axis. Furthermore, the length of the power generating element 2 in the positive direction of the y-axis according to the fourth example is L4. In this case, the creepage distance X4 satisfies the formula (6).

[0146]

number

[0147] For example, the length L4 of the power generating element 2 in the y-axis direction is 70 (mm), the radius of the structure 7a is 5 (mm), and d sdp Each of these is 15.7 mm (assuming pi is 3.14), wdq As described above, three structures 7 are provided in the y-axis direction, and the tensile elongation of the laminate film 3 is 20%.

[0148] In this case, the creepage distance X4 is d sdp The total is 47.1 (mm), dwdq The total is 40 (mm), so it is 87.1 (mm). Furthermore, in the fourth example, calculation is performed using formula (2). X in formula (2) corresponds to X4, and L corresponds to L4. In this case, the left side is 87.1 (mm) and the right side is 84 (mm), so formula (2) is satisfied. Furthermore, it is preferable to determine the size, shape, number, and arrangement of the multiple structures 7a so as to satisfy formula (2).

[0149] (Modification 2 of Embodiment 1) Next, a battery according to a second modification of the first embodiment will be described with reference to Fig. 7. Fig. 7 is a plan view of a battery 1b according to the second modification of the first embodiment.

[0150] In this modification, the shape of the plurality of structures 7b is different from that of embodiment 1. Specifically, battery 1b has the same configuration as battery 1 according to embodiment 1, except that the plurality of structures 7a are arranged in a striped pattern spaced apart from one another.

[0151] The plurality of structures 7b extend linearly in the x-axis direction, but are not limited to this, and may extend linearly in a direction other than the x-axis direction as long as they have a shape that allows contact along the first main surface 201. Furthermore, the plurality of structures 7b extend from one end to the other end of the power generating element 2 in plan view (i.e., from the end on the negative x-axis side to the end on the positive x-axis side of the power generating element 2), but are not limited to this.

[0152] The shape of each of the multiple structures 7b in a plane (yz plane) whose normal direction is the direction in which the multiple structures 7b extend (x-axis direction) is rectangular, as in embodiment 1, but it may also be semicircular, as in variant example 1 of embodiment 1.

[0153] Since the plurality of structures 7b are spaced apart from one another, a void 8b is located between two adjacent structures 7b among the plurality of structures 7b. Since the plurality of structures 7b are arranged in a striped pattern in plan view, the voids 8b are also arranged to extend in a striped pattern in plan view. In other words, in this modification, an elongated void 8b is provided.

[0154] As a result, when the first laminate film 31 is peeled off from the power generating element 2, a portion of this gap 8b is opened to the atmosphere, and air enters the gap 8, causing the entire gap 8b to have the same pressure as atmospheric pressure. The first laminate film 31 is pressed by the atmospheric pressure of the air that has entered the gap 8b, making it easier for the first laminate film 31 and the power generating element 2 to be released from the state in which they are in close contact due to atmospheric pressure.

[0155] By configuring the gap 8b in a long, thin stripe shape, when a portion of the gap 8b is opened to the atmosphere, a wider area is exposed to the same pressure as atmospheric pressure, resulting in more efficient peeling of the first laminate film 31 from the power-generating element 2. In other words, it is possible to provide a battery 1b in which the first laminate film 31 is more efficiently peeled off.

[0156] (Embodiment 2) Next, a battery according to a second embodiment will be described with reference to Fig. 8. Fig. 8 is a cross-sectional view of a battery 1c according to the second embodiment.

[0157] The battery 1c according to this embodiment has the same configuration as the battery 1 according to the first embodiment, except that it includes a plurality of structures 7 located on the second main surface 202 of the power generating element 2.

[0158] The second main surface 202 is the surface of the power generating element 2 facing away from the first main surface 201. In this embodiment, no protective plate 6 is arranged on the second main surface 202 side, but it may be arranged thereon.

[0159] In this embodiment, the plurality of structures 7 are located between the first laminate film 31 and the first main surface 201, and between the second laminate film 32 and the second main surface 202. The voids 8 are located between the first main surface 201 and the first laminate film 31, and between the second main surface 202 and the second laminate film 32 so as to be in contact with the plurality of structures 7. In this embodiment, the voids 8 are provided between each of the plurality of structures 7.

[0160] In this way, by providing the gaps 8 on both the first main surface 201 and the second main surface 202, peel electrification or frictional electrification is unlikely to occur when peeling off the first and second laminate films 31 and 32. This realizes a battery 1c in which the first and second laminate films 31 and 32 can be safely peeled off.

[0161] Furthermore, when the first and second laminate films 31 and 32 are peeled off from the power generating element 2, the first and second laminate films 31 and 32 are pressed by the atmospheric pressure that has entered the gap 8. This makes it easier for the first and second laminate films 31 and 32 to be released from the state in which they are in close contact with the power generating element 2 due to atmospheric pressure. As a result, the first and second laminate films 31 and 32 are efficiently peeled off from the power generating element 2.

[0162] In summary, it is possible to provide a battery 1c in which the first and second laminate films 31 and 32 can be peeled off safely and efficiently.

[0163] (Other embodiments) Although the battery according to one or more aspects has been described above based on the embodiments and modifications, the present disclosure is not limited to these embodiments and modifications. As long as they do not deviate from the gist of the present disclosure, various modifications conceivable by a person skilled in the art to the embodiments and modifications, as well as configurations constructed by combining components of different embodiments and modifications, are also included within the scope of the present disclosure.

[0164] For example, in the battery 1 according to the first embodiment, the structures 7 all have the same shape, but this is not limiting and the structures may have different shapes.

[0165] Furthermore, various modifications, substitutions, additions, omissions, etc. can be made to the above-described embodiments within the scope of the claims or their equivalents. [Industrial Applicability]

[0166] The battery according to the present disclosure can be used, for example, as an in-vehicle battery or a battery included in various electronic devices. [Explanation of symbols]

[0167] 1, 1a, 1b, 1c batteries 2 Power generation elements 3. Laminating film 4 Bottom of laminated film exterior 5 Sealing part 6 Protective plate 7, 7a, 7b structures 8, 8b void 20 battery cells 21 1st electrode layer 22 Solid electrolyte layer 23 Second electrode layer 31 First laminating film 32 Second laminating film 201 First main surface 202 Second main surface 211 First current collector 212 First active material layer 231 Second current collector 232 Second active material layer X, X1, X2, X3, X4 Creepage distance p1 one end p2 other end Elf Tensile Elongation

Claims

1. A battery, a power generating element including a positive electrode layer, a negative electrode layer, and a solid electrolyte layer located between the positive electrode layer and the negative electrode layer; an insulating structure located above a first main surface of the power generating element; a laminate film that houses the power generating element and the structure; Equipped with a gap is located between the first main surface and the laminate film so as to contact the structure, The battery comprises: A plurality of the structures are provided, the void is located between two adjacent structures among the plurality of structures, a creepage distance, which is a length along the first main surface and the surfaces of the plurality of structures in a direction parallel to the first main surface, is defined as X mm; The length of the power generating element in the direction is L mm, When the tensile elongation of the laminate film is Elf%, X>L×(1+(Elf / 100)) fulfill, battery.

2. Each of the plurality of structures has a rectangular parallelepiped shape. The battery of claim 1 .

3. The plurality of structures have convex curved surfaces that protrude toward the laminate film. The battery of claim 1 .

4. the plurality of structures are arranged in a matrix when viewed from above the power generating element; The battery according to any one of claims 1 to 3.

5. The plurality of structures are arranged in a stripe pattern spaced apart from one another. The battery according to any one of claims 1 to 3.

6. The solid electrolyte layer is a solid electrolyte layer containing a solid electrolyte having lithium ion conductivity. The battery of any one of claims 1 to 5.

7. further comprising a plurality of structures located on a second main surface of the power generating element facing away from the first main surface, The battery of any one of claims 1 to 6.

Images