Battery

Abstract

A battery according to the present disclosure comprises a laminate that includes a first current collector, a first electrode layer, an electrolyte layer, a second electrode layer, and a second current collector, in the given order, and a coating that has electron insulation properties, wherein: at an end of the laminate in a plan view of the laminate, the first current collector is provided with a first region not covered by the first electrode layer, the first electrode layer is provided with a second region not covered by the electrolyte layer, and the electrolyte layer is provided with a third region not covered by the second electrode layer; and the coating is provided to a location, of the main surfaces of the first current collector and the second current collector which face each other, that overlaps in the plan view at least one region selected from the group consisting of the first region, the second region, and the third region.

Description

battery

[0001] The present disclosure relates to batteries.

[0002] Stacked type batteries are disclosed in Patent Documents 1 and 2. In the batteries disclosed in Patent Documents 1 and 2, insulating layers are provided on the ends of current collectors.

[0003] International Publication No. 2022 / 145120 Japanese Patent Application Laid-Open No. 2020-123536

[0004] Compared to conventional batteries, there is room for improvement in terms of reliability.

[0005] Therefore, the present disclosure provides a battery that can improve reliability.

[0006] A battery according to one aspect of the present disclosure comprises a laminate including a first current collector, a first electrode layer, an electrolyte layer, a second electrode layer, and a second current collector, in this order, and a coating having electronic insulation properties, wherein, in a plan view of the laminate, at an end of the laminate, the first current collector has a first region that is not covered by the first electrode layer, the first electrode layer has a second region that is not covered by the electrolyte layer, and the electrolyte layer has a third region that is not covered by the second electrode layer, and the coating is provided at a position that overlaps, in the plan view, with at least one region selected from the group consisting of the first region, the second region, and the third region, of the main surfaces of the first current collector and the second current collector that face each other.

[0007] According to the present disclosure, the reliability of the battery can be improved.

[0008] FIG. 1 is a cross-sectional view of a battery according to embodiment 1. FIG. 2 is a plan view of a battery according to embodiment 1. FIG. 3A is a cross-sectional view of a battery according to modification 1 of embodiment 1. FIG. 3B is a cross-sectional view of a battery according to modification 2 of embodiment 1. FIG. 3C is a cross-sectional view of a battery according to modification 3 of embodiment 1. FIG. 3D is a plan view of a battery according to modification 4 of embodiment 1. FIG. 3E is a plan view of a battery according to modification 5 of embodiment 1. FIG. 4 is a cross-sectional view of a battery according to embodiment 2. FIG. 5 is a cross-sectional view of a battery according to embodiment 3. FIG. 6A is a cross-sectional view of a battery according to modification 1 of embodiment 3. FIG. 6B is a cross-sectional view of a battery according to modification 2 of embodiment 3. FIG. 6C is a cross-sectional view of a battery according to modification 3 of embodiment 3. FIG. 7 is a plan view of a battery according to embodiment 4.

[0009] (Summary of the Present Disclosure) A battery according to a first aspect of the present disclosure comprises a laminate including a first current collector, a first electrode layer, an electrolyte layer, a second electrode layer, and a second current collector in this order, and a coating having electronic insulation properties, wherein, at an end of the laminate in a plan view of the laminate, the first current collector has a first region that is not covered by the first electrode layer, the first electrode layer has a second region that is not covered by the electrolyte layer, and the electrolyte layer has a third region that is not covered by the second electrode layer, and the coating is provided at a position that overlaps, in the plan view, with at least one region selected from the group consisting of the first region, the second region, and the third region, of each of the mutually opposing main surfaces of the first current collector and the second current collector.

[0010] As a result, the second and third regions are provided at the ends of the laminate, and the distance between the first electrode layer and first current collector and the second electrode layer and second current collector, which have a polarity different from those of the first electrode layer and first current collector, can be increased. Therefore, even if misalignment occurs due to coating and pressing during the formation of the first electrode layer, electrolyte layer, and second electrode layer, the electrode layers, which have a polarity different from those of the first electrode layer and first current collector, are less likely to come into contact with each other, the current collectors, or the electrode layer and the current collector, thereby suppressing the occurrence of a short circuit. This improves the reliability of the battery.

[0011] Furthermore, the first region provided at the end of the laminate can be used to connect a lead for taking out the positive electrode or negative electrode, etc. This allows the space at the end of the laminate to be used effectively, and the energy density per unit volume can be increased.

[0012] On the other hand, at the end of the laminate, the application of an external force may cause deformation of at least one of the first current collector and the second current collector, and if the first current collector and the second current collector come into contact with each other, a short circuit may occur.

[0013] In contrast, the battery according to the present embodiment is provided with an electronically insulating coating, so that even if the first current collector and the second current collector are deformed, contact between the current collectors of opposite polarity and between the current collectors and the electrode layers of opposite polarity can be suppressed. This can suppress the occurrence of short circuits. In this way, the battery according to the present embodiment can suppress the occurrence of short circuits and improve reliability.

[0014] Furthermore, if the coating is softer and has cushioning properties than the current collector, even if the current collector deforms and the coating comes into contact with the edge of the electrode layer or electrolyte layer, the edge of the electrode layer or electrolyte layer can be prevented from collapsing, thereby preventing the occurrence of a short circuit due to the collapse of the edge.

[0015] A battery according to a second aspect of the present disclosure is the battery according to the first aspect, wherein the coating is in contact with at least one of the first electrode layer and the second electrode layer.

[0016] This reduces the gap between the coating and the first electrode layer or the second electrode layer, and increases the area of ​​the first current collector or the second current collector that is covered by the coating, thereby further reducing the possibility of short circuit occurrence.

[0017] A battery according to a third aspect of the present disclosure is the battery according to the first aspect, wherein the coating is spaced apart from at least one of the first electrode layer and the second electrode layer.

[0018] This reduces the precision required for forming the coating, facilitating manufacturing, improving productivity, and reducing costs. Furthermore, the gap between the coating and the first or second electrode layer is increased, allowing external forces to escape. The ability to withstand strong impacts further reduces the possibility of short circuits.

[0019] A battery according to a fourth aspect of the present disclosure is the battery according to any one of the first to third aspects, wherein the coating has ion conductivity.

[0020] This increases the degree of freedom in the selection of the material used for the coating and the degree of freedom in the formation method, for example, it becomes possible to form the coating using the same material as the solid electrolyte contained in the electrolyte layer.

[0021] A battery according to a fifth aspect of the present disclosure is a battery according to any one of the first to fourth aspects, further comprising a first resin member disposed between the second current collector and at least one region selected from the group consisting of the first region, the second region, and the third region.

[0022] The provision of the first resin member thereby prevents deformation of the first and second current collectors even when external force is applied. This prevents not only contact between the current collectors but also collapse of the edges due to contact and pressure with the electrode layer and electrolyte layer. This prevents short circuits caused by collapse of the edges, further improving the reliability of the battery.

[0023] A battery according to a sixth aspect of the present disclosure is the battery according to the fifth aspect, wherein the first resin member is in contact with the coating.

[0024] This can increase the resistance to external forces, making it possible to suppress the occurrence of short circuits and improve the reliability of the battery.

[0025] A battery according to a seventh aspect of the present disclosure is the battery according to the fifth or sixth aspect, wherein the thickness of the coating is smaller than the thickness of the first resin member.

[0026] The provision of the thick first resin member thereby suppresses deformation of the first and second current collectors due to external forces, thereby suppressing contact between the current collectors and collapse of the edges due to contact and pressure with the electrode layer and electrolyte layer, thereby suppressing the occurrence of short circuits and improving the reliability of the battery.

[0027] A battery according to an eighth aspect of the present disclosure is the battery according to the fifth or sixth aspect, wherein the thickness of the coating is greater than the thickness of the first resin member.

[0028] This allows for less precision to be required in forming the coating, making manufacturing easier, and achieving improved productivity and lower costs.

[0029] A battery according to a ninth aspect of the present disclosure is a battery according to any one of the fifth to eighth aspects, further comprising a second resin member covering at least one selected from the group consisting of the first electrode layer, the electrolyte layer, and the second electrode layer on a side surface of the laminate.

[0030] This can prevent the side surfaces of the laminate from collapsing, thereby reducing the possibility of short circuits and improving the reliability of the battery.

[0031] A battery according to a tenth aspect of the present disclosure is the battery according to the ninth aspect, wherein the second resin member is in contact with the coating.

[0032] This can increase the resistance to external forces, making it possible to suppress the occurrence of short circuits and improve the reliability of the battery.

[0033] A battery according to an eleventh aspect of the present disclosure is the battery according to the ninth or tenth aspect, wherein the first resin member and the second resin member are partially mixed with each other.

[0034] This can increase the resistance to external forces, making it possible to suppress the occurrence of short circuits and improve the reliability of the battery.

[0035] A battery according to a twelfth aspect of the present disclosure is the battery according to the ninth or tenth aspect, wherein the first resin member and the second resin member are in partial contact with each other.

[0036] This can increase the resistance to external forces, making it possible to suppress the occurrence of short circuits and improve the reliability of the battery.

[0037] A battery according to a thirteenth aspect of the present disclosure is a battery according to any one of the ninth to twelfth aspects, wherein at least one selected from the group consisting of the first electrode layer, the electrolyte layer, and the second electrode layer has a mixed portion with the material constituting the first resin member or the second resin member.

[0038] This increases the strength of the portion where the mixed portion is provided, further reducing the possibility of collapse, thereby further reducing the possibility of short circuiting and improving the reliability of the battery.

[0039] A battery according to a fourteenth aspect of the present disclosure is a battery according to any one of the first to thirteenth aspects, further comprising a second resin member covering at least one selected from the group consisting of the first electrode layer, the electrolyte layer, and the second electrode layer on a side surface of the laminate.

[0040] This can prevent the side surfaces of the laminate from collapsing, thereby reducing the possibility of short circuits and improving the reliability of the battery.

[0041] Hereinafter, embodiments of the present disclosure will be specifically described with reference to the drawings.

[0042] The embodiments described below are all comprehensive or specific examples. The numerical values, shapes, materials, components, component placement and connection configurations, steps, and step sequences 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 independent claims are described as optional components.

[0043] 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.

[0044] Furthermore, in this specification, terms indicating the relationship between elements, such as parallel and perpendicular, terms indicating the shape of elements, such as quadrilateral and trapezoid, and numerical ranges are not expressions that express only the strict meaning, but also expressions that include a substantially equivalent range, for example, a difference of about a few percent. For example, the corners of a polygon such as a quadrilateral or trapezoid may be rounded or may have a chamfered shape.

[0045] In this specification, unless otherwise specified, "planar view" refers to a view from a direction perpendicular to the main surface of a battery or the main surface of a power-generating element (z-axis direction). In the case of a flat member such as a plate, layer, foil, or film, the "main surface" refers to the main surface of the member, for example, the surface with the largest area, or the surface located opposite the surface with the largest area and having an area equivalent to that of the surface with the largest area. The main surface is usually flat, but may include minute irregularities or curvatures.

[0046] In this specification and the drawings, the x-axis, y-axis, and z-axis represent the three axes of a three-dimensional Cartesian coordinate system. The x-axis and y-axis are directions parallel to the main surface of the first current collector or the second current collector, and the z-axis is a direction perpendicular to the main surface of the first current collector or the second current collector. When the shape of the battery in plan view is rectangular, the x-axis and y-axis are directions parallel to a first side of the rectangle and a second side perpendicular to the first side, respectively. In this specification, the positive side of the z-axis may be considered "upward" and the negative side of the z-axis may be considered "downward."

[0047] Furthermore, in this specification, the terms "above" and "below" do not refer to the upward direction (vertically upward) and downward direction (vertically downward) in absolute spatial recognition, but are used as terms defined by a relative positional relationship based on the stacking order in a stacked configuration. Furthermore, the terms "above" and "below" are applied not only to a case where two components are arranged with a gap between them and another component exists between the two components, but also to a case where two components are arranged closely together and the two components are in contact with each other.

[0048] Furthermore, in this specification, ordinal numbers such as "first" and "second" do not refer to the number or order of components unless otherwise specified, but are used for the purpose of avoiding confusion and distinguishing between components of the same type.

[0049] First Embodiment [1. Configuration] First, the configuration of a battery according to a first embodiment will be described with reference to FIGS. 1 and 2. FIG.

[0050] FIG. 1 is a cross-sectional view of a battery 1 according to this embodiment. FIG. 2 is a plan view of the battery 1 according to this embodiment. FIG. 1 shows a cross section taken along line II in FIG. 2. Also, FIG. 2 omits the illustration of the second current collector 150. Note that in the drawings according to this specification, the thickness of each layer and the size of each region are exaggerated to make it easier to understand the layer structure of the unit cell 100 and the structure of the end portion of the laminate 10.

[0051] 1 and 2, the battery 1 includes a laminate 10 and a coating 40. The battery 1 is, for example, an all-solid-state battery.

[0052] The laminate 10 includes, in this order, a first current collector 110, a first electrode layer 120, an electrolyte layer 130, a second electrode layer 140, and a second current collector 150. In the present embodiment, the laminate 10 includes two sets of the first current collector 110, the first electrode layer 120, the electrolyte layer 130, the second electrode layer 140, and the second current collector 150. Specifically, the laminate 10 includes two unit cells 100A and 100B.

[0053] Each of the two unit cells 100A and 100B includes a first current collector 110, a first electrode layer 120, an electrolyte layer 130, a second electrode layer 140, and a second current collector 150, in this order. Specifically, in the unit cell 100A, the first current collector 110, the first electrode layer 120, the electrolyte layer 130, the second electrode layer 140, and the second current collector 150 are stacked in this order toward the positive direction of the z-axis. In the unit cell 100B, the first current collector 110, the first electrode layer 120, the electrolyte layer 130, the second electrode layer 140, and the second current collector 150 are stacked in this order toward the negative direction of the z-axis. That is, the stacking order of the current collectors and layers is reversed between the unit cells 100A and 100B. Furthermore, the unit cells 100A and 100B share the first current collector 110, but may each include a first current collector 110 individually.

[0054] The laminate 10 may include only one of the unit cells 100A and 100B. In the following, when there is no need to distinguish between the unit cells 100A and 100B, such as when describing matters common to the unit cells 100A and 100B, the unit cells 100A and 100B will be described as the unit cell 100.

[0055] The planar shape of the laminate 10 is rectangular, as shown in FIG. 2 . The planar shape of the laminate 10 may be a square, a trapezoid, a parallelogram, or another quadrilateral, or a hexagon, an octagon, or another polygon. The length or maximum width of each side of the planar shape of the laminate 10 is, for example, 10 mm or more and 500 mm or less. Each side of the planar shape of the laminate 10 is a straight line, but may also be a curved line. In this specification, unless otherwise specified, the "end" of the laminate 10 means a portion of a predetermined width along one side of the planar shape.

[0056] At the end of the stack 10 on the negative side of the x-axis, the first electrode layer 120, the electrolyte layer 130, and the second electrode layer 140 are formed in a stepped manner. The specific configuration of the end will be described later.

[0057] The other ends of the laminate 10, specifically, the end on the positive side of the x-axis, the end on the positive side of the y-axis, and the end on the negative side of the y-axis, are flush with the end faces of the first current collector 110, the first electrode layer 120, the electrolyte layer 130, and the second electrode layer 140, respectively, and form the side surfaces of the laminate 10. For example, the end faces of the first current collector 110, the first electrode layer 120, the electrolyte layer 130, and the second electrode layer 140 are cut surfaces formed by cutting them all at once. The cut surfaces are parallel to the z-axis. This reduces portions that do not contribute to the capacity of the battery 1, thereby increasing the energy density per unit volume of the battery 1. The cut surfaces may be inclined at a predetermined angle with respect to the z-axis. The cut surfaces include cut marks such as grooves or ridges extending in a predetermined direction. The end faces of the first current collector 110, the first electrode layer 120, the electrolyte layer 130, and the second electrode layer 140 may be polished surfaces that have been polished after cutting. The first electrode layer 120, the electrolyte layer 130, and the second electrode layer 140 may also be formed in a stepped manner at ends other than the end on the negative side of the x-axis of the laminate 10.

[0058] In this embodiment, the first current collector 110 and the first electrode layer 120 are a negative electrode current collector and a negative electrode layer, respectively. The second current collector 150 and the second electrode layer 140 are a positive electrode current collector and a positive electrode layer, respectively. The first current collector and the second current collector may be referred to as an electrode current collector and a counter electrode current collector, respectively. The first electrode layer and the second electrode layer may be referred to as an electrode layer and a counter electrode layer, respectively. Note that the first current collector 110 and the first electrode layer 120 may be a positive electrode current collector and a positive electrode layer, respectively, and the second current collector 150 and the second electrode layer 140 may be a negative electrode current collector and a negative electrode layer, respectively.

[0059] At least one of the two main surfaces of the first current collector 110 is in contact with the first electrode layer 120. In the present embodiment, the first electrode layer 120 is provided on each of the two main surfaces of the first current collector 110.

[0060] The thickness of the first current collector 110 is, for example, 5 μm or more and 100 μm or less. In this specification, the thickness of the current collector and each layer is the length in the stacking direction (z-axis direction). Unless otherwise specified, the thickness of the current collector and each layer can be considered as the average thickness of the object. The average thickness can be obtained, for example, by averaging thickness measurements at several points on the object.

[0061] Known materials can be used as the material of the first current collector 110. For example, a foil, plate, or mesh-like body made of copper, aluminum, nickel, iron, stainless steel, platinum, gold, or an alloy of two or more of these materials can be used as the first current collector 110. In addition to the foil, plate, or mesh-like body, the first current collector 110 may also include a connection layer that is a layer containing a conductive material and is provided in a portion that contacts the first electrode layer 120.

[0062] The second current collector 150 is in contact with the main surface of the second electrode layer 140 opposite to the electrolyte layer 130 side. The second current collector 150 faces the first current collector 110 via the first electrode layer 120, the electrolyte layer 130, and the second electrode layer 140. The thickness of the second current collector 150 is, for example, 5 μm or more and 100 μm or less.

[0063] Known materials can be used as the material of the second current collector 150. For example, a foil, plate, or mesh-like body made of copper, aluminum, nickel, iron, stainless steel, platinum, gold, or an alloy of two or more of these materials can be used for the second current collector 150. Note that, in addition to the foil, plate, or mesh-like body, the second current collector 150 may also include a connection layer that is a layer containing a conductive material and is provided in a portion that contacts the second electrode layer 140.

[0064] The first electrode layer 120 is in contact with the main surface of the first current collector 110. The main surface of the first electrode layer 120 opposite the first current collector 110 is in contact with the electrolyte layer 130. The first electrode layer 120 and the second electrode layer 140 face each other with the electrolyte layer 130 interposed therebetween. In a plan view, the area of ​​the first electrode layer 120 is larger than the area of ​​the second electrode layer 140 and is also larger than the area of ​​the electrolyte layer 130. The thickness of the first electrode layer 120 is, for example, 5 μm or more and 300 μm or less. The first electrode layer 120 is an active material layer containing an active material (e.g., a negative electrode active material). The materials used for the first electrode layer 120 will be described later.

[0065] The electrolyte layer 130 is provided between the first electrode layer 120 and the second electrode layer 140. The electrolyte layer 130 is in contact with both the first electrode layer 120 and the second electrode layer 140. In a plan view, the area of ​​the electrolyte layer 130 is larger than the area of ​​the second electrode layer 140 and smaller than the area of ​​the first electrode layer 120. For example, the electrolyte layer 130 is provided so as not to protrude beyond the first electrode layer 120 in a plan view. That is, the end face of the electrolyte layer 130 is flush with the end face of the first electrode layer 120 or recessed from the end face of the first electrode layer 120. The thickness of the electrolyte layer 130 is, for example, 5 μm or more and 150 μm or less. The electrolyte layer 130 is a solid electrolyte layer containing a solid electrolyte. The materials used for the electrolyte layer 130 will be described later.

[0066] The second electrode layer 140 is in contact with the main surface of the second current collector 150. The main surface of the second electrode layer 140 opposite the second current collector 150 is in contact with the electrolyte layer 130. In a plan view, the area of ​​the second electrode layer 140 is smaller than the area of ​​the electrolyte layer 130 and smaller than the area of ​​the first electrode layer 120. For example, the second electrode layer 140 is provided so as not to protrude beyond the electrolyte layer 130 in a plan view. That is, the end face of the second electrode layer 140 is flush with or recessed from the end face of the electrolyte layer 130. The thickness of the second electrode layer 140 is, for example, 5 μm or more and 300 μm or less. The second electrode layer 140 is an active material layer containing an active material (e.g., a positive electrode active material). Materials used for the second electrode layer 140 will be described later.

[0067] Here, the materials used for the electrolyte layer 130, the first electrode layer 120, and the second electrode layer 140 will be described.

[0068] The electrolyte layer 130 is an example of an electrolyte layer containing an electrolyte material. The electrolyte layer 130 contains at least a solid electrolyte as the electrolyte material, and may contain a binder material as necessary. The electrolyte layer 130 may contain a solid electrolyte having lithium ion conductivity. The electrolyte material contained in the electrolyte layer 130 is entirely solid electrolyte, except for unavoidable impurities, for example. Note that the electrolyte material used in the electrolyte layer 130 may further contain a nonaqueous electrolyte solution, a gel electrolyte solution, or an ionic liquid, so long as it contains a solid electrolyte as a main component. The following describes a case where all the electrolyte materials contained in the electrolyte layer 130 are solid electrolytes.

[0069] As the solid electrolyte, known materials such as lithium ion conductors, sodium ion conductors, magnesium ion conductors, etc. can be used. As the solid electrolyte, for example, a solid electrolyte material such as a sulfide solid electrolyte, a halide solid electrolyte, an oxide solid electrolyte, a polymer solid electrolyte, or a complex hydride solid electrolyte can be used.

[0070] As the sulfide solid electrolyte, in the case of a material capable of conducting lithium ions, for example, lithium sulfide (Li ２ S) and diphosphorus pentasulfide (P２ S ５ ) is used. As the sulfide solid electrolyte, Li ２ S-SiS ２ , Li ２ S-B ２ S ３ or Li ２ S-GeS ２ Sulfides such as Li may be used as an additive to the sulfides. ３ N, LiCl, LiBr, Li ３ P.O. ４ and Li ４ SiO ４ A sulfide to which at least one of the following is added may be used.

[0071] As the oxide solid electrolyte, in the case of a material that can conduct lithium ions, for example, Li ７ La ３ Zr ２ O １２ (LLZ), Li １．３ Al ０．３ Ti １．７ (P.O. ４ ) ３ (LATP) or (La,Li)TiO ３ (LLTO) and the like are used.

[0072] As the binder material, for example, elastomers such as styrene-based elastomers are used, and organic compounds such as polyvinylidene fluoride, acrylic resin, or cellulose resin may also be used.

[0073] In this embodiment, the first electrode layer 120 and the second electrode layer 140 are a negative electrode active material layer and a positive electrode active material layer, respectively.

[0074] The positive electrode active material layer contains at least a positive electrode active material, and may contain at least one of an electrolyte material such as a solid electrolyte, a conductive additive, and a binder material, as necessary.

[0075] As the positive electrode active material, known materials capable of occluding and releasing (inserting and desorbing, or dissolving and depositing) lithium ions, sodium ions, magnesium ions, etc. can be used. As the positive electrode active material, materials capable of extracting and inserting lithium ions include, for example, transition metal oxides, transition metal fluorides, polyanion materials, fluorinated polyanion materials, transition metal sulfides, transition metal oxysulfides, transition metal oxynitrides, sulfur, and lithium-containing compounds thereof. Examples of lithium-containing transition metal oxides include Li(NiCoAl)O ２ , Li(NiCoMn)O ２ , LiCoO ２ Li(NiCoAl)O ２ means that Ni, Co, and Al are contained in any ratio. Li(NiCoMn)O ２ means that Ni, Co and Mn are contained in any ratio. ０．８ Co ０．１５ Al ０．０５ O ２ ) can be used as the positive electrode active material.

[0076] The solid electrolyte may be any of the solid electrolyte materials exemplified above. The conductive material used in the conductive additive may be, for example, acetylene black, carbon black, graphite, carbon fiber, vapor-grown carbon, or conductive carbon such as carbon nanotubes. The binder may be any of the binder materials exemplified above.

[0077] The negative electrode active material layer contains at least a negative electrode active material, and may contain at least one of an electrolyte material such as a solid electrolyte, a conductive additive, and a binder material, as necessary.

[0078] 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, magnesium ions, etc. Materials capable of occluding and inserting lithium ions include, for example, carbon materials such as natural graphite, artificial graphite, graphite carbon fiber, and resin-baked carbon, metallic lithium, lithium alloys, silicon (Si), tin (Sn), silicon compounds, tin compounds, and oxides of lithium and transition metal elements. For example, graphite may be used as the negative electrode active material.

[0079] The solid electrolyte may be any of the solid electrolyte materials exemplified above. The conductive additive may be any of the conductive materials exemplified above. The binder material may be any of the binder materials exemplified above.

[0080] 2. Configuration of End Portion of Laminate Body Next, the configuration of the end portion of the laminate body 10 according to the first embodiment will be described.

[0081] 1 and 2, in a plan view of the stack 10, a first region 111, a second region 121, and a third region 131 are provided at the end of the unit cell 100A. The first region 111, the second region 121, and the third region 131 are all provided at the same end of the stack 10 (unit cell 100A), specifically, at the end on the negative side of the x-axis. The stack 10 also has a similar configuration in the unit cell 100B, but a description thereof will be omitted.

[0082] The first region 111 is provided at an end of the first current collector 110 in a plan view of the laminate 10, and is a region that is not covered by the first electrode layer 120. Specifically, the first region 111 is a region of the main surface of the first current collector 110 that is not covered by the first electrode layer 120. The first region 111 is not in contact with any of the first electrode layer 120, the electrolyte layer 130, the second electrode layer 140, and the second current collector 150. For example, as shown in FIG. 2 , the first region 111 is a rectangular region that is elongated in the y-axis direction along one side of the laminate 10 in a plan view, at the end of the laminate 10 on the negative side of the x-axis.

[0083] The second region 121 is provided at an end of the first electrode layer 120 in a plan view of the laminate 10, and is a region that is not covered by the electrolyte layer 130. Specifically, the second region 121 is a region of the main surface of the first electrode layer 120 that is not covered by the electrolyte layer 130. The second region 121 is not in contact with any of the electrolyte layer 130, the second electrode layer 140, and the second current collector 150. For example, as shown in FIG. 2 , the second region 121 is a rectangular region that is elongated in the y-axis direction along one side of the laminate 10 in a plan view, at the end of the laminate 10 on the negative side of the x-axis.

[0084] The third region 131 is provided at an end of the electrolyte layer 130 in a plan view of the laminate 10, and is a region that is not covered by the second electrode layer 140. Specifically, the third region 131 is a region of the main surface of the electrolyte layer 130 that is not covered by the second electrode layer 140. The third region 131 is not in contact with either the second electrode layer 140 or the second current collector 150. For example, as shown in FIG. 2 , the third region 131 is a rectangular region that is elongated in the y-axis direction along one side of the laminate 10 in a plan view, at the end of the laminate 10 on the negative side of the x-axis.

[0085] The first region 111, the second region 121, and the third region 131 are arranged in this order in the positive direction of the x-axis. The boundary line between the first region 111 and the second region 121 extends, for example, linearly along the y-axis, but may be inclined with respect to the y-axis or may be a curved line. The boundary line between the second region 121 and the third region 131 extends, for example, linearly along the y-axis, but may be inclined with respect to the y-axis or may be a curved line.

[0086] The first region 111, the second region 121, and the third region 131 may have the same size and shape or may have different sizes and shapes. For example, the width of the first region 111 may be larger than the width of the second region 121 and the width of the third region 131. The width of the second region 121 may be larger than the width of the third region 131. The width of each region is the length along the x-axis direction.

[0087] The width of the first region 111 is, for example, 1 mm or more and 20 mm or less. This makes it possible to increase the energy density of the battery 1 while ensuring an area where a terminal can be easily formed on the first current collector 110. The width of the first region 111 may be 3 mm or more and 5 mm or less.

[0088] The width of each of the second region 121 and the third region 131 is, for example, 0.1 mm or more and 5 mm or less. This makes it possible to increase the above-mentioned distance while increasing the energy density of the battery 1. The width of each of the second region 121 and the third region 131 may be, for example, 3 mm or more and 5 mm or less, or 0.5 mm or more and 2 mm or less.

[0089] If the widths of the regions are not uniform, such as when the shape of each region is not rectangular, the minimum and maximum widths of each region may be within the above ranges. For example, the minimum and maximum widths of the first region 111 may each be 1 mm or more and 20 mm or less. The same applies to the widths of the second region 121 and the third region 131.

[0090] In this way, the second region 121 and the third region 131 are provided at the ends of the laminate 10, thereby increasing the distance between the first electrode layer 120 and the first current collector 110 and the second electrode layer 140 and the second current collector 150, which have opposite polarities. This reduces the likelihood of contact between electrode layers, current collectors, or electrode layers and current collectors with opposite polarities, thereby suppressing the occurrence of short circuits. This improves the reliability of the battery 1. For example, the tolerance for misalignment due to coating and pressing during the formation of the first electrode layer 120, electrolyte layer 130, and second electrode layer 140 is large, which facilitates the manufacture of the battery 1, thereby improving productivity and reducing costs.

[0091] Furthermore, the first region 111 provided at the end of the laminate 10 can be used to extract the positive electrode or negative electrode. This allows for effective use of the space at the end of the laminate 10, thereby increasing the energy density per unit volume of the battery 1.

[0092] In this embodiment, the first electrode layer 120, the electrolyte layer 130, and the second electrode layer 140 are formed in a stepped shape at the end of the laminate 10. Therefore, not only a portion of each of the main surfaces of the first electrode layer 120 and the electrolyte layer 130 but also each of the end faces are uncovered. For example, the electrolyte layer 130 is not covered by the second electrode layer 140 at both a third region 131, which is a portion of the main surface at the end on the negative side of the x-axis, and at the end face on the negative side of the x-axis. Therefore, the creepage distance between the first electrode layer 120 and the second electrode layer 140 is increased, thereby further reducing the possibility of a short circuit occurring.

[0093] In the present embodiment, the first electrode layer 120 is a negative electrode active material layer, and the second electrode layer 140 is a positive electrode active material layer. In this case, because the second region 121 and the third region 131 are provided, the first electrode layer 120, which is a negative electrode active material layer, is relatively larger than the second electrode layer 140, which is a positive electrode active material layer. Therefore, metal ions are easily taken into the first electrode layer 120, which is a negative electrode active material layer, and precipitation of metal derived from the metal ions is suppressed, thereby further improving the reliability of the battery 1.

[0094] 3. Coating Next, the coating 40 provided on the end portion of the laminate 10 will be described.

[0095] In this embodiment, one or more coatings 40 are provided for each unit cell 100. For example, as shown in FIGS. 1 and 2, two coatings 40A are provided at the end of the unit cell 100A. A gap 30A is provided at the end of the unit cell 100A. Similarly, two coatings 40B are provided at the end of the unit cell 100B. A gap 30B is provided at the end of the unit cell 100B.

[0096] The following describes the coating 40A provided on the unit cell 100A. The coating 40B is the same as the coating 40A, and therefore its description will be omitted. When there is no need to distinguish between the coatings 40A and 40B, such as when describing matters common to the coatings 40A and 40B, the coatings will be described as coating 40. Similarly, the voids 30A and 30B will be described as void 30. Similarly, the coatings 41A and 41B and the coatings 42A and 42B shown in modified examples described later will be described as coatings 41 and 42.

[0097] The coating 40 is provided at a position overlapping in plan view with at least one region selected from the group consisting of the first region 111, the second region 121, and the third region 131 on the opposing principal surfaces of the first current collector 110 and the second current collector 150. In the example shown in FIG. 1 , the coating 40 is provided on the principal surface 150a of the second current collector 150. The principal surface 150a faces the principal surface 110a of the first current collector 110 and is the principal surface on which the second electrode layer 140 of the unit cell 100A is provided. The principal surface 110a is the principal surface on which the first electrode layer 120 of the unit cell 100A is provided.

[0098] As shown in FIG. 1 , the coating 40 is provided so as to overlap the first region 111, the second region 121, and the third region 131 in a planar view. In the present embodiment, the coating 40 continuously covers the main surface 150a of the second current collector 150 from the end on the negative side of the x-axis to a position where the coating 40 overlaps the third region 131 in a planar view. The coating 40 is separated from at least one of the first electrode layer 120 and the second electrode layer 140. In the present embodiment, the coating 40 is not in contact with any of the first current collector 110, the first electrode layer 120, the electrolyte layer 130, and the second electrode layer 140. A gap 30 is provided between the coating 40 and the main surface 110a of the first current collector 110.

[0099] The thickness of the coating 40 is smaller than the thickness of at least one selected from the group consisting of the first electrode layer 120, the electrolyte layer 130, and the second electrode layer 140. In the present embodiment, the thickness of the coating 40 is smaller than the thickness of the second electrode layer 140.

[0100] The coating 40 is formed using a resin having electronic and ionic insulating properties. For example, a thermosetting resin, a photo-curable resin such as an ultraviolet ray curable resin, or an electron beam curable resin can be used for the coating 40. Specifically, a silicone resin, an epoxy resin, an acrylic resin, or a polyimide resin can be used for the coating 40. The coating 40 is formed, for example, by applying a liquid resin composition and then curing it by heating or by irradiating it with light or an electron beam. Alternatively, the coating 40 may be formed by applying an insulating resin in the form of an adhesive tape.

[0101] The coating 40 may be a metal oxide film having electronic and ionic insulation properties. Alternatively, the coating 40 may have ion conductivity. For example, the coating 40 may be formed using a solid electrolyte material having ion conductivity, such as LiPON. The coating 40 may be formed using the same material as the electrolyte layer 130.

[0102] In the laminate 10 provided with the first region 111, the second region 121, and the third region 131 as in the present embodiment, a short circuit may occur. For example, when an external force is applied, at least one of the first current collector 110 and the second current collector 150 may be deformed. The deformation may cause the first current collector 110 and the second current collector 150 to come into contact with each other, resulting in a short circuit. Furthermore, the deformed second current collector 150 may come into contact with and press the first region 111, the second region 121, and the third region 131, which may cause the ends of the first electrode layer 120, the electrolyte layer 130, and the second electrode layer 140 to collapse. If the collapse occurs, the first electrode layer 120 and the second electrode layer 140 may come into contact with each other, resulting in a short circuit.

[0103] In contrast, the battery 1 according to the present embodiment is provided with the coating 40 having electronic insulation, so that even if the first current collector 110 or the second current collector 150 is deformed, contact therebetween can be suppressed, thereby suppressing the occurrence of a short circuit. Furthermore, by using a film that is softer and has cushioning properties than the second current collector 150 as the coating 40, even if the first current collector 110 or the second current collector 150 is deformed, it is possible to suppress the collapse of the ends of the first electrode layer 120, the electrolyte layer 130, and the second electrode layer 140. In this way, the battery 1 according to the present embodiment can suppress the occurrence of a short circuit and improve reliability.

[0104] In this embodiment, as shown in Fig. 2 , the coating 40 is provided in the first region 111, one at each end in the y-axis direction. In other words, the two coatings 40 are provided at two corners of each of the first current collector 110 and the second current collector 150 in a plan view. By providing the coatings 40 at the corners that are prone to deformation when an external force is applied, the possibility of a short circuit can be further reduced, and the reliability of the battery 1 can be improved.

[0105] The arrangement, shape, and number of the coatings 40 are not limited to the example shown in Fig. 2. Next, modified examples of the arrangement and shape of the coatings 40 will be described. The following description will focus on differences from the first embodiment, and descriptions of commonalities will be omitted or simplified.

[0106] <Modification 1> Fig. 3A is a cross-sectional view of a battery 1A according to Modification 1 of the present embodiment. The battery 1A shown in Fig. 3A differs from the battery 1 in that it includes a coating 41 instead of the coating 40. The coating 41 is different in size from the coating 40.

[0107] The coating 41 is in contact with at least one of the first electrode layer 120 and the second electrode layer 140. Specifically, the coating 41 is in contact with an end face of the second electrode layer 140. The coating 41 is not in contact with the first electrode layer 120 or the electrolyte layer 130. The coating 41 is in contact with and covers the main surface 150a of the second current collector 150 from the end of the main surface 150a on the negative side of the x axis to the end of the second electrode layer 140 on the negative side of the x axis.

[0108] In the battery 1A according to this modification, the coating 41 can completely cover the exposed portion of the main surface 150a of the second current collector 150 along the x-axis direction, further reducing the possibility of short circuits and improving the reliability of the battery 1A.

[0109] <Modification 2> Fig. 3B is a cross-sectional view of a battery 1B according to Modification 2 of the present embodiment. Battery 1B shown in Fig. 3B differs from battery 1 in that it includes coating 42 instead of coating 40. Coating 42 is different in size from coating 40.

[0110] The coating 42 is in contact with at least one of the first electrode layer 120 and the second electrode layer 140. Specifically, a portion of the coating 42 is provided between the second electrode layer 140 and the main surface 150a of the second current collector 150 and is in contact with each of them. The coating 42 is not in contact with the first electrode layer 120 or the electrolyte layer 130. A portion of the coating 42 overlaps the second electrode layer 140 in a plan view.

[0111] In the battery 1B according to this modification, the coating 42 can completely cover the exposed portion of the main surface 150a of the second current collector 150 along the x-axis direction, further reducing the possibility of a short circuit and improving the reliability of the battery 1B.

[0112] <Modification 3> Figure 3C is a cross-sectional view of a battery 1C according to Modification 3 of the present embodiment. Battery 1C shown in Figure 3C differs from battery 1 in that it includes coating 42A instead of coating 40A. Coating 42A is the same as coating 42A included in battery 1B according to Modification 2, and a portion of coating 42A is provided between second electrode layer 140 and second current collector 150 and is in contact with each other.

[0113] When a battery has multiple unit cells 100A and 100B, as in battery 1C, the size and shape of the coating 40 provided on each unit cell 100 may be different. For example, battery 1C may include coating 40A and coating 41B or 42B, or coating 41A and coating 40B or 42B. Battery 1C may also include coating 42A and coating 41B.

[0114] Strict precision relative to design values ​​is not required for the shapes and arrangement positions of the coatings 40, 41, and 42. This allows for easy manufacture of a highly reliable battery 1C.

[0115] <Modification 4> Fig. 3D is a plan view of a battery 1D according to Modification 4 of the present embodiment. In the battery 1D shown in Fig. 3D, the coating 40 is provided from one end to the other end of the first current collector 110 (or the second current collector 150) along the y-axis direction. Since the size of the coating 40 is increased, the possibility of a short circuit can be further reduced. Note that a portion of the coating 40 may be provided to extend outward from the second current collector 150.

[0116] <Modification 5> Figure 3E is a plan view of a battery 1E according to Modification 5 of the present embodiment. In the battery 1E shown in Figure 3E, the coating 40 is provided at the center of the main surface 110a of the first current collector 110 (or the main surface 150a of the second current collector 150) in the y-axis direction, and is not provided at both ends. For example, the coating 40 extends from the center of the main surface 110a in the y-axis direction by an equal length on both the positive and negative sides of the y-axis. This makes it possible to effectively reduce the possibility of a short circuit by simply providing the coating 40 in one location.

[0117] The lengths of the coating 40 extending from the center of the main surface 110a in the y-axis direction to the positive and negative sides of the y-axis do not have to be the same. For example, the coating 40 may extend to one end of the main surface 110a on the positive or negative side of the y-axis.

[0118] Furthermore, in the first embodiment and each of the modified examples, the coatings 40, 41, and 42 are provided at positions overlapping the first region 111, the second region 121, and the third region 131, respectively, in a planar view, but this is not limited thereto. For example, the coatings 40, 41, and 42 may not overlap the first region 111 in a planar view, but may overlap only the second region 121 and the third region 131. Furthermore, the coatings 40, 41, and 42 may overlap only the third region 131 in a planar view. Furthermore, the coatings 40, 41, and 42 may be provided discretely so as to overlap the first region 111 and the third region 131 in a planar view, but not overlap the second region 121 in a planar view.

[0119] Furthermore, the planar shapes of the coatings 40, 41, and 42 are rectangular, but are not limited to this. The planar shapes of the coatings 40, 41, and 42 may be other quadrilaterals such as squares, trapezoids, or parallelograms, or other polygons such as hexagons or octagons. Alternatively, the shapes of the coatings 40, 41, and 42 may be irregular. Specifically, the coatings 40, 41, and 42 may have a shape in which a plurality of projections and depressions are irregularly arranged.

[0120] Furthermore, in the first embodiment and each of the modified examples, the coatings 40, 41, and 42 are provided on the principal surface 150a, but this is not limiting. The coatings 40, 41, and 42 may be provided on the principal surface 110a. Alternatively, the coatings 40, 41, and 42 may be provided on both the principal surface 110a and the principal surface 150a, respectively. The coatings 40, 41, and 42 are provided, for example, between the principal surface 110a and the first electrode layer 120. Alternatively, the coatings 40, 41, and 42 may cover the surfaces of the first electrode layer 120, the electrolyte layer 130, and the second electrode layer 140 opposite the first current collector 110.

[0121] Furthermore, when the coating 40, 41, or 42 is in contact with at least one of the group consisting of the first electrode layer 120, the electrolyte layer 130, and the second electrode layer 140, a mixed portion containing the material constituting the coating 40, 41, or 42 may be provided in at least one of the group consisting of the first electrode layer 120, the electrolyte layer 130, and the second electrode layer 140. The first electrode layer 120, the electrolyte layer 130, and the second electrode layer 140 are each porous layers. Therefore, when the liquid resin composition before curing comes into contact with at least one of the group consisting of the first electrode layer 120, the electrolyte layer 130, and the second electrode layer 140, it enters the pores from the contact portion by capillary action. A curing treatment is then performed to form the mixed portion. The provision of the mixed portion increases the strength of the end portion, further reducing the possibility of collapse. This improves the reliability of the battery 1, 1A, 1B, 1C, 1D, or 1E.

[0122] 4. Manufacturing Method Next, a method for manufacturing the battery 1 according to this embodiment will be described.

[0123] First, a first current collector 110 having a rectangular shape in a plan view is prepared. Next, a first electrode layer 120 is formed on at least one of the two main surfaces of the prepared first current collector 110. In this embodiment, the first electrode layer 120 is formed on both of the two main surfaces of the first current collector 110.

[0124] For example, the first electrode layer 120 can be formed by applying a slurry made of tetralin in which a negative electrode active material (e.g., graphite), a sulfide solid electrolyte, a binder, and a dispersant are dispersed, followed by drying. Tetralin is an example of a solvent. As the solvent, known solvents used in producing known all-solid-state batteries (e.g., lithium-ion all-solid-state batteries) can be used. The same applies to the solvents of the slurries used to form the electrolyte layer 130 and the second electrode layer 140.

[0125] At this time, the first electrode layer 120 is formed so as to provide the first region 111 without covering a portion of the main surface of the first current collector 110. Specifically, the start position for applying the slurry for the first electrode layer 120 is set to a position a predetermined distance away from the end of the first current collector 110. The predetermined distance is, for example, 1 mm or more and 20 mm or less.

[0126] Next, the electrolyte layer 130 is formed on the first electrode layer 120. For example, the electrolyte layer 130 can be formed by applying a slurry made of tetralin in which a sulfide solid electrolyte, a binder, and a dispersant are dispersed, and then drying the slurry. At this time, the electrolyte layer 130 is formed so as to provide the second region 121 without covering a portion of the main surface of the first electrode layer 120. Specifically, the start position for applying the slurry for the electrolyte layer 130 is set to a position a predetermined distance away from the end of the first electrode layer 120. The predetermined distance is, for example, 3 mm or more and 5 mm or less, but may also be 0.1 mm or more and 5 mm or less.

[0127] Next, the second electrode layer 140 is formed on the electrolyte layer 130. For example, the second electrode layer 140 can be formed by applying and drying a slurry made of tetralin in which a positive electrode active material (e.g., NCA), a sulfide solid electrolyte, a binder, and a dispersant are dispersed. At this time, the second electrode layer 140 is formed so as to provide a third region 131 without covering a portion of the main surface of the electrolyte layer 130. Specifically, the start position of application of the slurry for the second electrode layer 140 is set to a position a predetermined distance away from the end of the electrolyte layer 130. The predetermined distance is, for example, 3 mm or more and 5 mm or less, but may also be 0.1 mm or more and 5 mm or less.

[0128] In this embodiment, the first electrode layer 120, the electrolyte layer 130, and the second electrode layer 140 are formed in this order on each of the two main surfaces of the first current collector 110. At this time, the same types of layers may be formed simultaneously, or the first electrode layer 120, the electrolyte layer 130, and the second electrode layer 140 may be formed on one of the two main surfaces of the first current collector 110, and then the first electrode layer 120, the electrolyte layer 130, and the second electrode layer 140 may be formed on the other of the two main surfaces of the first current collector 110. At this time, pressing may be performed each time each layer is coated and dried. Alternatively, pressing may be performed after all layers have been coated and dried. As the pressing, for example, a high-pressure pressing process such as a roll press, a plate press, or an isostatic press (ISP) is used.

[0129] Next, the second current collector 150 is prepared, on which the coating 40 is formed. For example, the coating 40 is formed by printing a thermosetting resin at a predetermined position on the main surface 150a of the second current collector 150 by screen printing, and then polymerizing and curing the resin by heating.

[0130] When the coating 40 is a metal oxide film, the coating 40 can be formed by oxidizing the surface layer of the second current collector 150. Alternatively, the coating 40 may be formed by applying a metal oxide precursor in the form of a film to the main surface 150a of the second current collector 150 by screen printing, inkjet printing, or the like, and then drying or heating the applied film. When the coating 40 contains an electrolyte such as LiPON, the coating 40 may be formed by applying a solution containing LiPON and drying it, or by forming the film by a vapor phase method.

[0131] Next, the second current collector 150 on which the coating 40 has been formed is positioned and attached so as to cover the second electrode layer 140. In this attached state, the second current collector 150 is pressed while being heated, thereby adhering the second current collector 150 to the second electrode layer 140.

[0132] Through the above steps, the laminate 10 having the coating 40 provided on the end portion is formed.

[0133] The coating 40 may be formed on the main surface 110a of the first current collector 110. In this case, the coating 40 may be formed before the first electrode layer 120 is formed, or after the second electrode layer 140 is formed. The specific method for forming the coating 40 is the same as the method for forming it on the main surface 150a of the second current collector 150.

[0134] After the second current collector 150 is bonded, the laminate 10 may be cut along three sides in plan view other than the end portion on which the coating 40 is provided. By forming cut surfaces parallel to the stacking direction of the three sides of the laminate 10, it is possible to remove portions that do not contribute to the battery capacity, thereby increasing the energy density per unit volume. This allows the manufacture of a small, large-capacity battery 1.

[0135] For cutting, a blade such as a cutter, an ultrasonic cutter, a slitter, a dicer, a cutting machine, or a punching machine incorporating a Thomson blade, or a laser or jet may be used, but the cutting method is not limited to these. In addition, in order to prevent short circuits through the cut surface, the cut surface may be polished after cutting to remove burrs and the like.

[0136] Furthermore, a single large current collector may be used as the first current collector 110 to simultaneously manufacture a plurality of batteries 1. That is, a single current collector is used to form a structure of a plurality of batteries 1, and then the structure is cut into individual pieces, thereby manufacturing a plurality of batteries 1.

[0137] The manufactured battery 1 is enclosed in an exterior body such as a laminate film. For example, a metal lead for extraction is joined to the first region 111 of the battery 1, and the battery 1 is enclosed in a laminate film so that at least a portion of the metal lead is extended to the outside of the exterior body. The exterior body may be a metal can.

[0138] The manufacturing method for batteries 1A, 1B, 1C, 1D, and 1E according to each of the modifications is the same as the manufacturing method for battery 1 described above. By adjusting the formation position and shape of coating 40, coating 40, 41, or 42 shown in modifications 1 to 5 can be formed. For example, coating 40 may be formed so as to overlap at least one region selected from the group consisting of first region 111, second region 121, and third region 131 in a planar view.

[0139] Second Embodiment Next, a second embodiment will be described.

[0140] The main difference between the second embodiment and the first embodiment is that a second resin member is provided to cover the side surface of the laminate. The following description will focus on the differences from the first embodiment, and the description of the commonalities between the first embodiment and the second embodiment will be omitted or simplified.

[0141] 4 is a cross-sectional view of the battery 2 according to the present embodiment. As shown in FIG. 4, the battery 2 differs from the battery 1 according to the first embodiment in that the battery 2 includes a second resin member 50.

[0142] The second resin member 50 covers at least one selected from the group consisting of the first electrode layer 120, the electrolyte layer 130, and the second electrode layer 140 on the side surface of the laminate 10. For example, as shown in FIG. 4 , the second resin member 50 covers each of the first electrode layer 120, the electrolyte layer 130, and the second electrode layer 140. Furthermore, the second resin member 50 covers the end face of the first current collector 110 and the end face and main surface of the second current collector 150. In the present embodiment, the second resin member 50 covers the entire laminate 10. As a result, the void 30 is not in communication with the external space of the battery 2.

[0143] The second resin member 50 is formed using an insulating resin having electronic and ionic insulation properties. For example, a thermosetting resin, a photo-curable resin such as an ultraviolet ray curable resin, or an electron beam curable resin can be used as the second resin member 50. Specifically, a silicone resin, an epoxy resin, an acrylic resin, a polyimide resin, or the like can be used as the second resin member 50.

[0144] The second resin member 50 is formed, for example, by applying a liquid resin composition and then curing it by heating or by irradiating it with light or an electron beam. The formation of the second resin member 50 is performed after the second current collector 150 is joined.

[0145] In the battery 2 according to this embodiment, the second resin member 50 is provided, which can prevent the side surfaces of the stack 10 from collapsing. This can reduce the possibility of a short circuit and improve the reliability of the battery 2.

[0146] In the battery 2, at least one selected from the group consisting of the first electrode layer 120, the electrolyte layer 130, and the second electrode layer 140 may have a mixed portion with the material constituting the second resin member 50. The first electrode layer 120, the electrolyte layer 130, and the second electrode layer 140 are each porous layers. Therefore, when the liquid resin composition before curing comes into contact with at least one of the group consisting of the first electrode layer 120, the electrolyte layer 130, and the second electrode layer 140, it penetrates into the pores from the contact portion by capillary action. A curing process is then performed to form the mixed portion. The provision of the mixed portion increases the strength of the end portion, further reducing the possibility of collapse. This improves the reliability of the battery 2.

[0147] In the present embodiment, the coating 40 and the second resin member 50 may be partially in contact with each other or partially mixed with each other. In other words, the boundary between the coating 40 and the second resin member 50 may be clearly visible, or the materials may be mixed together so that the boundary cannot be seen.

[0148] The position where the second resin member 50 is provided is not limited to the example shown in FIG. 4 . For example, the second resin member 50 may cover only the side surfaces of the laminate 10 without covering the main surfaces of the laminate 10, i.e., the main surfaces of the second current collectors 150. The second resin member 50 also covers all four sides of the laminate 10 in a plan view, but is not limited to this. For example, the second resin member 50 may cover the remaining three sides without covering the end (one side) where the coating 40 is provided. The second resin member 50 may also cover only the corners of the laminate 10 in a plan view.

[0149] The battery 2 is also encapsulated in an exterior body such as a laminate film. At this time, the second resin member 50 and the resin layer of the laminate film may be partially in contact with each other or partially mixed with each other. For example, after a liquid resin composition for forming the second resin member 50 is applied, the battery 2 is encapsulated in a laminate film before being cured. By heat treatment during encapsulation, a portion of the second resin member 50 and a portion of the resin layer of the laminate film may be mixed and bonded to each other.

[0150] Third Embodiment Next, a third embodiment will be described.

[0151] The main difference between the third embodiment and the first embodiment is that the first resin member is provided at an end of the laminate. The following description will focus on the differences from the first embodiment, and the description of the commonalities between the first embodiment and the third embodiment will be omitted or simplified.

[0152] Fig. 5 is a cross-sectional view of a battery 3 according to the present embodiment. As shown in Fig. 5, the battery 3 differs from the battery 1 according to the first embodiment in that it includes a first resin member 20. In addition, a gap 30 is provided at the end of the laminate 10.

[0153] In this embodiment, one or more first resin members 20 and one or more voids 30 are provided for each unit cell 100. For example, as shown in Fig. 5, two first resin members 20A and two voids 30A are provided at the end of the unit cell 100A. Similarly, two first resin members 20B and two voids 30B are provided at the end of the unit cell 100B.

[0154] The following describes the first resin member 20A and the void 30A provided in the unit cell 100A. The first resin member 20B and the void 30B are the same as the first resin member 20A and the void 30A, respectively, and therefore will not be described again. Note that when there is no need to distinguish between the first resin members 20A and 20B, such as when describing matters common to the first resin members 20A and 20B, they will be described as the first resin member 20. Similarly, the voids 30A and 30B will be described as the void 30.

[0155] The first resin member 20 is provided between the second current collector 150 and at least one region selected from the group consisting of the first region 111, the second region 121, and the third region 131. For example, as shown in FIG. 5 , the first resin member 20 is provided between the first region 111 and the second current collector 150. In the present embodiment, the first resin member 20 is not provided in the second region 121 or the third region 131. The first resin member 20 is not in contact with any of the first electrode layer 120, the electrolyte layer 130, and the second electrode layer 140.

[0156] The thickness of the first resin member 20 is greater than the thickness of at least one selected from the group consisting of the first electrode layer 120, the electrolyte layer 130, and the second electrode layer 140. In this embodiment, the thickness of the first resin member 20 is equal to the sum of the thicknesses of the first electrode layer 120, the electrolyte layer 130, and the second electrode layer 140. The thickness of the first resin member 20 is the length in the z-axis direction. Furthermore, when comparing two thicknesses, "equal" does not only mean equal in the strict sense, but also includes cases where the two thicknesses are slightly different. Specifically, in this specification, "equal" also includes cases where the difference between the two thicknesses is 5% or less of the larger of the two thicknesses.

[0157] In the present embodiment, the first resin member 20 is in contact with the coating 40. Specifically, the upper surface of the first resin member 20 is in contact with the lower surface of the coating 40, and the lower surface of the first resin member 20 is in contact with the first region 111, i.e., the main surface of the first current collector 110. The first resin member 20 functions as a pillar that maintains the distance between the first current collector 110 and the second current collector 150. The shape of the first resin member 20 is, for example, a rectangular parallelepiped, but is not limited to this.

[0158] The first resin member 20 is formed using an insulating resin having electronic and ionic insulation properties. For example, a thermosetting resin, a photo-curable resin such as an ultraviolet ray curable resin, or an electron beam curable resin can be used as the first resin member 20. Specifically, a silicone resin, an epoxy resin, an acrylic resin, a polyimide resin, or the like can be used as the first resin member 20.

[0159] The void 30 is provided between the first current collector 110 and the second current collector 150 at an end of the laminate 10. In the present embodiment, the void 30 is provided between the first resin member 20 and each end of the first electrode layer 120, the electrolyte layer 130, and the second electrode layer 140. For example, the void 30 contacts each of a part of the first region 111, the second region 121, and the third region 131. In other words, the part of the first region 111, the second region 121, and the third region 131 are all exposed to the void 30 and are not in contact with any of the other members.

[0160] In this embodiment, the void 30 communicates with the external space of the laminate 10. That is, the void 30 is not a closed space but an open space. Note that, since the battery 3 is usually enclosed in an exterior body such as a laminate film, the void 30 does not communicate with the external space of the exterior body.

[0161] In the laminate 10 provided with the first region 111, the second region 121, and the third region 131 as in the present embodiment, a short circuit may occur. For example, when an external force is applied, at least one of the first current collector 110 and the second current collector 150 may be deformed. The deformation may cause the first current collector 110 and the second current collector 150 to come into contact with each other, resulting in a short circuit. Furthermore, the deformed second current collector 150 may come into contact with and press the first region 111, the second region 121, and the third region 131, which may cause the ends of the first electrode layer 120, the electrolyte layer 130, and the second electrode layer 140 to collapse. If the collapse occurs, the first electrode layer 120 and the second electrode layer 140 may come into contact with each other, resulting in a short circuit.

[0162] In contrast, in the battery 3 according to the present embodiment, the first resin member 20 is provided, which can suppress deformation of the first current collector 110 and the second current collector 150. This can suppress the occurrence of short circuits. Furthermore, the gap 30 is provided, which can release external forces. Since the battery 3 can withstand strong impacts, it can further reduce the possibility of contact between the current collectors and collapse of the first electrode layer 120, the electrolyte layer 130, and the second electrode layer 140. Thus, the battery 3 according to the present embodiment can suppress the occurrence of short circuits and improve reliability.

[0163] In the present embodiment, the first resin members 20 are provided in the first region 111, one at each end in the y-axis direction, similar to the coating 40 shown in Fig. 2. In other words, the two first resin members 20 are provided at two corners of each of the first current collector 110 and the second current collector 150 in a plan view. By providing the first resin members 20 at the corners that are easily deformed when an external force is applied, the possibility of a short circuit can be further reduced, and the reliability of the battery 3 can be improved.

[0164] The first resin member 20 is formed after the first electrode layer 120, the electrolyte layer 130, and the second electrode layer 140 are formed in this order on the first current collector 110, and before the second current collector 150 is joined. For example, the first resin member 20 is formed by printing a thermosetting resin by screen printing at a position a predetermined distance from the end of the first electrode layer 120, and then polymerizing and curing the resin by heating. The predetermined distance is, for example, 3 mm or more and 5 mm or less, but is not limited to this.

[0165] Furthermore, the first resin member 20 may be formed by applying a photocurable resin or an electron beam curable resin and then irradiating it with light such as ultraviolet light or an electron beam. Alternatively, the resin may be disposed at the end portion by inkjet printing or by discharging using a dispenser. Alternatively, the first resin member 20 may be formed after the second current collector 150 has been joined. Resin may be disposed in the gap between the first current collector 110 and the second current collector 150 by inkjet printing or by discharging using a dispenser. Alternatively, the first resin member 20 may be formed by dipping the end portion of the laminate 10.

[0166] The arrangement, shape, and number of the first resin members 20 are not limited to the example shown in FIG. 2 . For example, like the coating 40 of the battery 1D shown in FIG. 3D or the battery 1E shown in FIG. 3E , the first resin members 20 may have an elongated shape extending along the y-axis direction. Alternatively, the first resin members 20 may have an irregular shape. Furthermore, the first resin members 20 may be provided so as to straddle the first region 111 and the second region 121, or so as to straddle the first region 111, the second region 121, and the third region 131. That is, the first resin members 20 may be in contact with at least one layer selected from the group consisting of the first electrode layer 120, the electrolyte layer 130, and the second electrode layer 140.

[0167] Furthermore, the first resin member 20 may not be provided in the first region 111, but may be provided so as to span only the second region 121 and the third region 131. That is, the first resin member 20 may be provided so as to be in contact with the first electrode layer 120 and the electrolyte layer 130, and the second current collector 150, respectively, but may not be in contact with the first current collector 110. The first resin member 20 may also be provided only in the third region 131. That is, the first resin member 20 may be provided so as to be in contact with the electrolyte layer 130 and the second current collector 150, and may not be in contact with either the first current collector 110 or the electrolyte layer 130. The first resin member 20 may not be provided in the second region 121, but may be provided discretely in the first region 111 and the third region 131. That is, the first resin member 20 is arranged so as to be in contact with the first current collector 110 and the electrolyte layer 130, and the second current collector 150, respectively, and does not have to be in contact with the first electrode layer 120.

[0168] Furthermore, when the first resin member 20 is in contact with at least one of the group consisting of the first electrode layer 120, the electrolyte layer 130, and the second electrode layer 140, a mixed portion containing the material constituting the first resin member 20 may be provided in at least one of the group consisting of the first electrode layer 120, the electrolyte layer 130, and the second electrode layer 140. The first electrode layer 120, the electrolyte layer 130, and the second electrode layer 140 are each porous layers. Therefore, when the liquid resin composition before curing comes into contact with at least one of the group consisting of the first electrode layer 120, the electrolyte layer 130, and the second electrode layer 140, it penetrates into the pores from the contact portion by capillary action. A curing process is then performed to form the mixed portion. The provision of the mixed portion increases the strength of the end portion, further reducing the possibility of collapse. This improves the reliability of the battery 3.

[0169] Furthermore, the coating 40 and the first resin member 20 may be partially mixed with each other. In other words, the boundary between the coating 40 and the first resin member 20 may be clearly visible, or the materials may be mixed so that the boundary cannot be seen. For example, the liquid resin composition for forming the coating 40 and the liquid resin composition for forming the first resin member 20 are applied so that they come into contact with each other. Depending on the viscosity of the resin compositions, the liquid resin compositions may mix at the contact area. By curing the resin composition in a partially mixed state, the coating 40 and the first resin member 20 can be partially mixed with each other.

[0170] In the battery 3, the coating 40 and the first resin member 20 are in contact with each other, but this is not limiting. Next, several modified examples of the battery 3 according to the present embodiment will be described. The following description will focus on differences from the third embodiment, and descriptions of commonalities will be omitted or simplified.

[0171] <Modification 1> Fig. 6A is a cross-sectional view of a battery 3A according to Modification 1 of the present embodiment. The battery 3A shown in Fig. 6A differs from the battery 3 in that the coating 40 is not in contact with the first resin member 20. The coating 40 shown in Fig. 6A is provided so as to overlap the second region 121 and the third region 131 in a plan view, but does not overlap the first region 111. A gap 30 is provided between the coating 40 and the first resin member 20 provided in the first region 111. In this modification, the first resin member 20 is in contact with the second current collector 150. The thickness of the coating 40 is smaller than the thickness of the first resin member 20.

[0172] Like the battery 3 according to the third embodiment, the battery 3A according to this modification can suppress the occurrence of short circuits and improve reliability.

[0173] <Modification 2> Fig. 6B is a cross-sectional view of a battery 3B according to Modification 2 of the present embodiment. The battery 3B shown in Fig. 6B differs from the battery 3 in the thickness of the coating 40. Specifically, in this modification, the thickness of the coating 40 is greater than the thickness of the first resin member 20.

[0174] The thickness of the first resin member 20 and the thickness of the coating 40 are both lengths in the z-axis direction. As shown in FIG. 6B , the thickness of the coating 40 is not uniform. In this case, the thickness of the coating 40 is considered to be the maximum thickness of the coating 40. The same applies when the thickness of the first resin member 20 is not uniform. That is, in this modified example, the maximum value of the thickness of the coating 40 is greater than the maximum value of the thickness of the first resin member 20.

[0175] Like the battery 3 according to the third embodiment, the battery 3B according to this modification can suppress the occurrence of short circuits and improve reliability.

[0176] In addition, in this modification, the coating 40 is in contact with the electrolyte layer 130, but the coating 40 and the electrolyte layer 130 may be spaced apart and not in contact with each other. Also, the coating 40 and the first resin member 20 may be spaced apart.

[0177] <Modification 3> Fig. 6C is a cross-sectional view of a battery 3C according to Modification 3 of the present embodiment. The battery 3C shown in Fig. 6C differs from the battery 3 in that it further includes a second resin member 50. The second resin member 50 is the same as the second resin member 50 included in the battery 2 according to the second embodiment.

[0178] In this modification, the second resin member 50 and the first resin member 20 may contain, for example, different main components. Alternatively, the second resin member 50 and the first resin member 20 may contain the same main component. Here, the main component refers to the basic skeleton of the resin. The second resin member 50 and the first resin member 20 may be formed using the same material.

[0179] 6C, the second resin member 50 and the first resin member 20 may be partially in contact with each other or partially mixed with each other. In other words, the boundary between the second resin member 50 and the first resin member 20 may be clearly visible, or the materials may be mixed so that the boundary cannot be seen. For example, the liquid resin composition for forming the first resin member 20 and the liquid resin composition for forming the second resin member 50 are applied so that they come into contact with each other. Depending on the viscosity of the resin compositions, the liquid resin compositions may mix at the contact area. By curing the resin composition in a partially mixed state, the first resin member 20 and the second resin member 50 can be partially mixed with each other.

[0180] (Fourth embodiment) Next, a fourth embodiment will be described.

[0181] The main difference between the fourth embodiment and the first embodiment is that a tab to which a lead for taking out the positive or negative electrode is connected is provided on the current collector. The following description will focus on the differences from the first embodiment, and the description of the commonalities will be omitted or simplified.

[0182] Fig. 7 is a plan view of a battery 4 according to this embodiment. The battery 4 shown in Fig. 7 differs from the battery 1 shown in Fig. 2 in that a first tab 112 is provided on a first current collector 110 and a second tab 152 is provided on a second current collector 150. The battery 4 also includes a first lead 160 and a second lead 162.

[0183] The first tab 112 is a protrusion provided so as to protrude outward (toward the negative x-axis) from the end of the first current collector 110. The first tab 112 is not covered by any of the first electrode layer 120, the electrolyte layer 130, and the second electrode layer 140. In other words, the entire first tab 112 corresponds to the first region 111.

[0184] The second tab 152 is a protrusion provided to protrude outward (toward the negative x-axis) from the end of the second current collector 150. The second tab 152 is not covered by any of the first electrode layer 120, the electrolyte layer 130, and the second electrode layer 140.

[0185] The first tab 112 and the second tab 152 are provided at positions where they do not overlap each other in a plan view. This reduces the possibility of the first tab 112 and the second tab 152 coming into contact with each other and causing a short circuit. Furthermore, the first lead 160 and the second lead 162 can be easily connected.

[0186] In this embodiment, the coatings 40 are disposed near the first tab 112 and the second tab 152. Specifically, one coating 40 is disposed so as to be aligned with the first tab 112 along the x-axis direction (the direction in which the tabs protrude). The other coating 40 is disposed so as to be aligned with the second tab 152 along the x-axis direction.

[0187] The portion where the second tab 152 is provided is a portion where the second current collector 150 extends outward, and is therefore prone to deformation when an external force is applied. Therefore, by disposing the coating 40 near the second tab 152, even if the second current collector 150 is deformed, contact between the second current collector 150 and the first current collector 110 and the first electrode layer 120 can be suppressed, thereby reducing the possibility of a short circuit. Furthermore, by using a film that is softer and more cushioning than the second current collector 150 as the coating 40, even if the first current collector 110 or the second current collector 150 is deformed, collapse of the ends of the first electrode layer 120, the electrolyte layer 130, and the second electrode layer 140 can be suppressed. The same applies to the first tab 112. In this way, disposing the coating 40 near the first tab 112 and the second tab 152 can improve the reliability of the battery 4.

[0188] The first tab 112 and the second tab 152 are formed when the first current collector 110 and the second current collector 150 are molded into a predetermined shape, respectively. For example, the first current collector 110 provided with the first tab 112 can be integrally formed by removing a portion of a rectangular current collector. For the removal process, a cutting tool such as a cutter, a slitter, a cutting machine, or a punching machine with a Thomson blade, a laser, or a jet may be used, but the method is not limited to these. The same applies to the second current collector 150 provided with the second tab 152.

[0189] The first lead 160 and the second lead 162 are terminals for extracting the positive and negative electrodes from the battery 4, respectively. The first lead 160 and the second lead 162 are each a metal plate or metal foil made of copper, aluminum, or the like. The first lead 160 is mechanically and electrically joined to the first tab 112. The second lead 162 is mechanically and electrically joined to the second tab 152. For joining, means such as ultrasonic welding, resistance welding, and crimping are used, but the means are not limited to these.

[0190] When the battery 4 is enclosed in an exterior body such as a laminate film, a portion of each of the first lead 160 and the second lead 162 is extended to the outside of the exterior body. The portions of each of the first lead 160 and the second lead 162 extended to the outside of the exterior body are connected to another substrate or the like, enabling charging and discharging of the battery 4. Each of the first lead 160 and the second lead 162 may have a resin member provided on the surface layer thereof to increase the bonding strength to the laminate film and improve the sealing performance of the battery 4.

[0191] The first tab 112, the second tab 152, the first lead 160 and the second lead 162 provided on the battery 4 may also be provided on the batteries according to the above-mentioned embodiments 1 to 3 and their respective variations.

[0192] While the battery according to one or more aspects has been described above based on the embodiments, the present disclosure is not limited to these embodiments. As long as the modifications do not deviate from the gist of the present disclosure, modifications that would occur to a person skilled in the art to the present embodiments and modifications constructed by combining components of different embodiments are also included within the scope of the present disclosure.

[0193] For example, in each embodiment and each modified example, an example has been shown in which a step-like structure is provided only at the end on the negative side of the x-axis of the stack 10, but this is not limited thereto. A step-like end may also be provided at at least one of the end on the positive side of the x-axis, the end on the positive side of the y-axis, and the end on the negative side of the y-axis of the stack 10. Furthermore, the step-like end provided in the unit cell 100A and the step-like end provided in the unit cell 100B may be provided at different ends of the stack 10.

[0194] For example, in each embodiment and each modified example, the ends of the first electrode layer 120, the electrolyte layer 130, and the second electrode layer 140 do not have to be stepped. For example, the ends of the first electrode layer 120, the electrolyte layer 130, and the second electrode layer 140 may be pressed to form an obliquely inclined surface. That is, at the end of each layer, the main surface and the end surface may not be clearly distinguishable. The inclined surface may be flat, curved, or include fine irregularities. For example, the end of each layer may have irregular projections or depressions. Furthermore, at the end of each layer, one layer may be recessed into the other layer. For example, the end of the electrolyte layer 130 may be recessed into the end of the first electrode layer 120. In other words, at the end of the electrolyte layer 130, a projection protruding toward the first electrode layer 120 may be provided on the lower surface, and at the end of the first electrode layer 120, a depression into which the projection is inserted may be provided on the upper surface.

[0195] Furthermore, the second region 121 and the third region 131 may not be provided at the end where the first region 111 is provided. For example, at the end where the first region 111 is provided, the electrolyte layer 130 may completely cover the end of the first electrode layer 120 and be in contact with a part of the main surface of the first current collector 110. Furthermore, at the end where the first region 111 is provided, the end faces of the first electrode layer 120, the electrolyte layer 130, and the second electrode layer 140 may be flush with each other, forming a flat surface parallel to the z-axis.

[0196] The voids 30 may also be provided inside the first resin member 20. That is, the voids 30 may be air bubbles present inside the first resin member 20. A plurality of air bubbles of various sizes and shapes may be provided inside the first resin member 20.

[0197] The number of unit cells 100 included in the battery according to each embodiment may be three or more. For example, the battery may have a configuration in which a plurality of the stacks 10 shown in FIG. 1 are stacked in the z-axis direction. This makes it easy to connect a plurality of unit cells 100 in parallel, thereby enabling a large capacity battery to be achieved.

[0198] Alternatively, the first electrode layer 120 may be provided on one of the two main surfaces of the first current collector 110, and the second electrode layer 140 may be provided on the other of the two main surfaces. That is, the first current collector 110 may function as a bipolar current collector. In this case, it becomes easy to connect a plurality of unit cells 100 in series, thereby achieving high battery output.

[0199] At least one of the first current collector 110 and the second current collector 150 may be bent or curved at the end of the laminate 10. For example, at the end of the laminate 10, the thickness of the first resin member 20 or the coating 40 may be greater than the total thickness of the first electrode layer 120, the electrolyte layer 130, and the second electrode layer 140. In this case, at least one of the first current collector 110 and the second current collector 150 may be bent or curved.

[0200] Furthermore, various modifications, substitutions, additions, omissions, etc. can be made to the above-described embodiments within the scope of the claims or their equivalents.

[0201] The present disclosure can be used as a secondary battery for use in various electronic devices such as notebook computers, electrical appliances, electric vehicles, and the like.

[0202] 1, 1A, 1B, 1C, 1D, 1E, 2, 3, 3A, 3B, 3C, 4 Battery 10 Laminate 20, 20A, 20B First resin member 30, 30A, 30B Gap 40, 40A, 40B, 41, 41A, 41B, 42, 42A, 42B Coating 50 Second resin member 100, 100A, 100B Unit cell 110 First current collector 110a, 150a Main surface 111 First region 112 First tab 120 First electrode layer 121 Second region 130 Electrolyte layer 131 Third region 140 Second electrode layer 150 Second current collector 152 Second tab 160 First lead 162 Second lead

Claims

1. A battery comprising: a laminate including a first current collector, a first electrode layer, an electrolyte layer, a second electrode layer, and a second current collector in this order; and a coating having electronic insulation properties, wherein, in a plan view of the laminate, at an end of the laminate, the first current collector has a first region that is not covered by the first electrode layer, the first electrode layer has a second region that is not covered by the electrolyte layer, and the electrolyte layer has a third region that is not covered by the second electrode layer, and the coating is provided at a position that overlaps, in the plan view, with at least one region selected from the group consisting of the first region, the second region, and the third region on each of the opposing main surfaces of the first current collector and the second current collector.

2. The battery according to claim 1, wherein the coating is in contact with at least one of the first electrode layer and the second electrode layer.

3. The battery according to claim 1, wherein the coating is spaced apart from at least one of the first electrode layer and the second electrode layer.

4. The battery according to any one of claims 1 to 3, wherein the coating has ion conductivity.

5. The battery according to any one of claims 1 to 3, further comprising a first resin member provided between the second current collector and at least one region selected from the group consisting of the first region, the second region, and the third region.

6. The battery according to claim 5, wherein the first resin member is in contact with the coating.

7. The battery according to claim 5, wherein the thickness of the coating is smaller than the thickness of the first resin member.

8. The battery according to claim 5, wherein the thickness of the coating is greater than the thickness of the first resin member.

9. The battery according to claim 5, further comprising a second resin member covering at least one selected from the group consisting of the first electrode layer, the electrolyte layer and the second electrode layer on a side surface of the laminate.

10. The battery according to claim 9, wherein the second resin member is in contact with the coating.

11. The battery according to claim 9, wherein the first resin member and the second resin member are partially mixed with each other.

12. The battery according to claim 9, wherein the first resin member and the second resin member are in partial contact with each other.

13. The battery according to claim 9, wherein at least one selected from the group consisting of the first electrode layer, the electrolyte layer, and the second electrode layer has a mixed portion with the material constituting the first resin member or the second resin member.

14. The battery according to any one of claims 1 to 3, further comprising a second resin member covering at least one selected from the group consisting of the first electrode layer, the electrolyte layer, and the second electrode layer on a side surface of the laminate.

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