Battery

Abstract

A battery according to the present disclosure comprises: a multilayer body that includes 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 first resin member. At an end of the multilayer body in a plan view of the multilayer body, the first current collector is provided with a first region that is not covered by the first electrode layer, the first electrode layer is provided with a second region that is not covered by the electrolyte layer, and the electrolyte layer is provided with a third region that is not covered by the second electrode layer. The first resin member is provided between the second current collector and at least one region that is selected from the group consisting of the first region, the second region, and the third region. At the end of the multilayer body, a gap is provided between the first current collector and the second current collector.

Description

battery

[0001] The present disclosure relates to batteries.

[0002] Stacked-type batteries are disclosed in Patent Documents 1 to 3. In the batteries disclosed in Patent Documents 1 to 3, a resin member is provided on an end of a current collector, and a gap is provided between the resin member and an active material layer.

[0003] International Publication No. 2021 / 210287 Japanese Patent Application Laid-Open No. 2007-273349 Japanese Patent Application Laid-Open No. 2021-177478

[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 first resin member, 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, the first resin member is 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, and a gap is provided between the first current collector and the second current collector at the end of the laminate.

[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 plan view of a battery according to modification 1 of embodiment 1. FIG. 3B is a plan view of a battery according to modification 2 of embodiment 1. FIG. 3C is a plan 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. 6 is a cross-sectional view of a battery according to embodiment 4. FIG. 7A is a cross-sectional view of a battery according to modification 1 of embodiment 4. FIG. 7B is a cross-sectional view of a battery according to modification 2 of embodiment 4. FIG. 7C is a cross-sectional view of a battery according to modification 3 of embodiment 4. FIG. 8 is a plan view of a battery according to embodiment 5.

[0009] (Summary of the Present Disclosure) A battery according to a first aspect of the present disclosure includes 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 first resin member, 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, the first resin member is 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, and a gap is provided between the first current collector and the second current collector at the end of the laminate.

[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 for effective use of the space at the end of the laminate, thereby increasing the energy density per unit volume.

[0012] On the other hand, at the end of the laminate, at least one of the first current collector and the second current collector may be deformed by the application of an external force. If the first current collector and the second current collector come into contact with each other, a short circuit may occur. Furthermore, contact with the first current collector or the second current collector may cause parts of the first electrode layer, the electrolyte layer, and the second electrode layer to collapse, which may cause the first electrode layer and the second electrode layer to come into contact with each other, resulting in a short circuit.

[0013] In contrast, the battery according to this embodiment includes a first resin member, which prevents contact between the current collectors and collapse of the ends due to contact and pressure with the electrode layer and electrolyte layer, even if the first and second current collectors are deformed. This prevents short circuits from occurring. Furthermore, the gap allows external forces to escape. The battery can withstand strong impacts, further reducing the likelihood of contact between the current collectors and collapse of the first electrode layer, electrolyte layer, and second electrode layer. Thus, the battery according to this embodiment prevents short circuits and improves reliability.

[0014] A battery according to a second aspect of the present disclosure is the battery according to the first aspect, wherein the thickness of the first resin member is greater than the thickness of at least one selected from the group consisting of the first electrode layer, the electrolyte layer, and the second electrode layer.

[0015] This prevents the current collectors from coming into contact with each other and the edges from collapsing due to contact and pressure with the electrode layer and electrolyte layer, even if the first current collector and the second current collector are deformed by the application of an external force, thereby preventing short circuits and improving the reliability of the battery.

[0016] A battery according to a third aspect of the present disclosure is the battery according to the first or second aspect, wherein the thickness of the first resin member is equal to the sum of the thicknesses of the first electrode layer, the electrolyte layer, and the second electrode layer.

[0017] This makes it possible to suppress deformation of the first current collector and the second current collector due to external forces, thereby suppressing contact between the current collectors and collapse of the edges due to contact with and pressure on the electrode layer and the electrolyte layer, thereby suppressing the occurrence of short circuits and improving the reliability of the battery.

[0018] A battery according to a fourth aspect of the present disclosure is the battery according to the first or second aspect, wherein the thickness of the first resin member is greater than the sum of the thicknesses of the first electrode layer, the electrolyte layer, and the second electrode layer.

[0019] This makes it possible to suppress deformation of the first current collector and the second current collector due to external forces, thereby suppressing contact between the current collectors and collapse of the edges due to contact with and pressure on the electrode layer and the electrolyte layer, thereby suppressing the occurrence of short circuits and improving the reliability of the battery.

[0020] A battery according to a fifth aspect of the present disclosure is the battery according to the first or second aspect, wherein the thickness of the first resin member is smaller than the sum of the thicknesses of the first electrode layer, the electrolyte layer, and the second electrode layer.

[0021] This prevents the current collectors from coming into contact with each other and the edges from collapsing due to contact and pressure with the electrode layer and electrolyte layer, even if the first current collector and the second current collector are deformed by the application of an external force, thereby preventing short circuits and improving the reliability of the battery.

[0022] A battery according to a sixth aspect of the present disclosure is a battery according to any one of the first to fifth aspects, further comprising an insulating layer covering at least one region selected from the group consisting of the first region, the second region, and the third region.

[0023] This makes it possible to mechanically and electrically protect the ends of the electrode layer or electrolyte layer, thereby suppressing the occurrence of short circuits and improving the reliability of the battery.

[0024] A battery according to a seventh aspect of the present disclosure is the battery according to the sixth aspect, wherein the thickness of the first resin member is equal to the thickness of the insulating layer.

[0025] This allows the first resin member to suppress deformation of the first current collector or the second current collector when an external force is applied, thereby suppressing the occurrence of a short circuit and improving the reliability of the battery.

[0026] A battery according to an eighth aspect of the present disclosure is the battery according to the sixth aspect, wherein the thickness of the first resin member is greater than the thickness of the insulating layer.

[0027] This allows the first resin member to suppress deformation of the first current collector or the second current collector when an external force is applied, making it difficult for the force to be transmitted to the ends of the electrode layer and the electrolyte layer via the insulating layer, thereby suppressing collapse of the ends and preventing short circuits from occurring, thereby improving the reliability of the battery.

[0028] A battery according to a ninth aspect of the present disclosure is the battery according to the sixth aspect, wherein the thickness of the first resin member is smaller than the thickness of the insulating layer.

[0029] This allows the first resin member to prevent the first or second current collector from being significantly deformed when an external force is applied. Furthermore, the insulating layer provides mechanical and electrical protection to the ends of the electrode layer and the electrolyte layer. This prevents short circuits from occurring, improving the reliability of the battery.

[0030] A battery according to a tenth aspect of the present disclosure is a battery according to any one of the first to ninth 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.

[0031] 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.

[0032] A battery according to an eleventh aspect of the present disclosure is the battery according to the tenth aspect, 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 second resin member.

[0033] 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.

[0034] A battery according to a twelfth aspect of the present disclosure is the battery according to the tenth or eleventh aspect, wherein the first resin member and the second resin member contain different main components.

[0035] This allows selection of materials suitable for the respective functions of the first resin member and the second resin member.

[0036] A battery according to a thirteenth aspect of the present disclosure is the battery according to the tenth or eleventh aspect, wherein the first resin member and the second resin member contain the same main component.

[0037] This allows for the use of resins with the same main component, which contributes to improved productivity and reduced costs.

[0038] A battery according to a fourteenth aspect of the present disclosure is a battery according to any one of the tenth to thirteenth aspects, wherein the first resin member and the second resin member are partially in contact with each other or partially mixed with each other.

[0039] This can increase resistance to external forces, making it possible to suppress the occurrence of short circuits and improve the reliability of the battery.

[0040] A battery according to a fifteenth aspect of the present disclosure is a battery according to any one of the first to fourteenth aspects, wherein the first resin member is provided in the first region when viewed in plan, and is not provided in the second region or the third region.

[0041] This allows for a sufficiently large gap to be formed, allowing external forces to escape. Since the battery can withstand strong impacts, it is possible to further reduce the possibility of contact between current collectors and the collapse of the first electrode layer, electrolyte layer, and second electrode layer. This reduces the occurrence of short circuits, thereby improving the reliability of the battery.

[0042] A battery according to a sixteenth aspect of the present disclosure is a battery according to any one of the first to fifteenth aspects, wherein the first resin member is not in contact with any of the first electrode layer, the electrolyte layer, and the second electrode layer.

[0043] This allows for a sufficiently large gap to be formed, allowing external forces to escape. Since the battery can withstand strong impacts, it is possible to further reduce the possibility of contact between current collectors and the collapse of the first electrode layer, electrolyte layer, and second electrode layer. This reduces the occurrence of short circuits, thereby improving the reliability of the battery.

[0044] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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."

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 1 and 2 , the battery 1 includes a laminate 10 and a first resin member 20. A gap 30 is provided at an end of the laminate 10. The battery 1 is, for example, an all-solid-state battery.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] Here, the materials used for the electrolyte layer 130, the first electrode layer 120, and the second electrode layer 140 will be described.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] 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.

[0081] 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 extracting 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.

[0082] 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.

[0083] 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.

[0084] 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.

[0085] 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.

[0086] 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.

[0087] 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.

[0088] 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.

[0089] 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.

[0090] 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.

[0091] 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.

[0092] 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.

[0093] 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.

[0094] 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.

[0095] 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.

[0096] 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.

[0097] 3. First Resin Member and Voids Next, the first resin member 20 and the voids 30 provided at the end portions of the laminate 10 will be described.

[0098] 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 Figures 1 and 2, 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.

[0099] 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.

[0100] 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 FIGS. 1 and 2 , 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.

[0101] 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.

[0102] The upper surface of the first resin member 20 is in contact with the lower surface of the second current collector 150, 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.

[0103] 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.

[0104] 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.

[0105] 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 1 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.

[0106] 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.

[0107] In contrast, in the battery 1 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 1 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 1 according to the present embodiment can suppress the occurrence of short circuits and improve reliability.

[0108] In the present embodiment, as shown in Fig. 2 , the first resin members 20 are provided in the first region 111, one at each end in the y-axis direction. 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 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.

[0109] The arrangement, shape, and number of the first resin members 20 are not limited to the example shown in Fig. 2. Modified examples of the arrangement and shape of the first resin members 20 will be described below. The following description will focus on differences from the first embodiment, and explanation of commonalities will be omitted or simplified.

[0110] <Variation 1> Fig. 3A is a plan view of a battery 1A according to Variation 1 of the present embodiment. In the battery 1A shown in Fig. 3A, the first resin member 20 is provided from one end to the other end of the first region 111 along the y-axis direction. The increased size of the first resin member 20 increases its strength. This increases impact resistance and further reduces the possibility of short circuits.

[0111] Note that a part of the first resin member 20 may be provided so as to protrude outward from the first region 111. Furthermore, the first resin member 20 may extend in a direction inclined with respect to the y-axis, or may be provided in a curved shape.

[0112] <Variation 2> Figure 3B is a plan view of a battery 1B according to Variation 2 of the present embodiment. In the battery 1B shown in Figure 3B, the first resin member 20 is provided at the center of the first region 111 in the y-axis direction, and is not provided at either end. For example, the first resin member 20 extends from the center of the first region 111 in the y-axis direction by equal lengths on both the positive and negative sides of the y-axis. This allows the first resin member 20 to effectively withstand external forces and reduce the possibility of short-circuiting.

[0113] The extension lengths of the first resin member 20 from the center of the first region 111 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 first resin member 20 may extend to one end of the first region 111 on the positive or negative sides of the y-axis. The first resin member 20 may extend in a direction inclined with respect to the y-axis, or may be provided in a curved shape.

[0114] <Variation 3> Figure 3C is a plan view of a battery 1C according to Variation 3 of the present embodiment. In the battery 1C shown in Figure 3C, the first resin member 20 has an irregular shape in a plan view. The shapes and sizes of the two first resin members 20 may be different from each other. Not only the plan view shape, but also the side view shape may be irregular. For example, the first resin member 20 has a shape in which multiple protrusions and recesses are irregularly arranged. In other words, the first resin member 20 does not need to be molded into a geometric shape. Since the precision required for forming the first resin member 20 is low, manufacturing is easier, and improved productivity and reduced costs can be achieved.

[0115] The first resin member 20 provided in the batteries 1A and 1B according to the first and second modifications may have an irregular shape, as in this modification.

[0116] <Variation 4> Fig. 3D is a plan view of a battery 1D according to Variation 4 of the present embodiment. In the battery 1D shown in Fig. 3D, the first resin member 20 is provided so as to straddle the first region 111 and the second region 121. For example, the first resin member 20 is in contact with the first electrode layer 120. By having the first resin member 20 in contact with and covering the first electrode layer 120, it is possible to suppress the collapse of the first electrode layer 120 and reduce the possibility of a short circuit.

[0117] In this modification, the first resin member 20 may be provided only in the second region 121, without being provided in the first region 111. In other words, the first resin member 20 may be provided between the first electrode layer 120 and the second current collector 150 so as to be in contact with each other, and may not be in contact with the first current collector 110.

[0118] In addition, in this modified example, an irregularly shaped first resin member 20 is given as an example, but a regularly shaped first resin member 20 may be provided in the second region 121, as in the battery 1 according to embodiment 1 and the batteries 1A and 1B according to modified examples 1 and 2.

[0119] <Modification 5> Fig. 3E is a plan view of a battery 1E according to Modification 5 of the present embodiment. In the battery 1E shown in Fig. 3E, the first resin member 20 is provided so as to straddle the first region 111, the second region 121, and the third region 131. For example, the first resin member 20 is in contact with the first electrode layer 120 and the electrolyte layer 130. By having the first resin member 20 in contact with and covering the first electrode layer 120 and the electrolyte layer 130, it is possible to suppress the collapse of the first electrode layer 120 and the electrolyte layer 130, and to reduce the possibility of a short circuit.

[0120] In this modification, the first resin member 20 may be in contact with the second electrode layer 140. For example, the first resin member 20 may be provided so as to cover the entire third region 131. In this case, the void 30 is provided, for example, inside the first resin member 20.

[0121] 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.

[0122] In addition, in this modified example, an irregularly shaped first resin member 20 is given as an example, but a regularly shaped first resin member 20 may be provided in the second region 121, as in the battery 1 according to embodiment 1 and the batteries 1A and 1B according to modified examples 1 and 2.

[0123] Furthermore, in the present embodiment and each modified example, an example has been shown in which the first resin member 20 is in contact with each of the first current collector 110 and the second current collector 150, but this is not limiting. The first resin member 20 does not have to be in contact with at least one of the first current collector 110 and the second current collector 150. In other words, the void 30 may be present between the first resin member 20 and the first current collector 110, or between the first resin member 20 and the second current collector 150. Since the precision required for forming the first resin member 20 is low, manufacturing is facilitated, and improved productivity and reduced costs can be achieved.

[0124] 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 1.

[0125] 4. Manufacturing Method Next, a method for manufacturing the battery 1 according to this embodiment will be described.

[0126] 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.

[0127] 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.

[0128] 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.

[0129] 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.

[0130] 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.

[0131] 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.

[0132] Next, the first resin member 20 is formed in the first region 111 of the first current collector 110. 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.

[0133] Next, the second current collector 150 is positioned and bonded to the first resin member 20 and the second electrode layer 140 so as to cover them. The bonded members are pressed while being heated, thereby bonding the second current collector 150 to the second electrode layer 140 and the first resin member 20. A gap 30 is formed between the first resin member 20 and each of the second electrode layer 140, the electrolyte layer 130, and the first electrode layer 120. Note that the gap 30 may be provided between the second current collector 150 and the first resin member 20.

[0134] In this embodiment, first resin members 20A and 20B are formed on two main surfaces of first current collector 110, respectively. At this time, after forming first resin member 20A and first resin member 20B, second current collectors 150 of unit cells 100A and 100B may be bonded to each other. Alternatively, first resin member 20A may be formed, and second current collector 150 of unit cell 100A may be bonded to each other, and then first resin member 20B may be formed, and second current collector 150 of unit cell 100B may be bonded to each other.

[0135] Through the above steps, the laminate 10 is formed with the first resin member 20 and the void 30 provided at the end portion.

[0136] After the second current collector 150 is bonded, the laminate 10 may be cut along three sides in a plan view, excluding the ends where the first resin member 20 and the void 30 are 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.

[0137] 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.

[0138] 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.

[0139] 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.

[0140] 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.

[0141] The manufacturing method of batteries 1A, 1B, 1C, 1D, and 1E according to each of the modifications is the same as the manufacturing method of battery 1 described above. The first resin member 20 shown in modifications 1 to 5 can be formed by adjusting the formation position and shape of the first resin member 20. For example, the first resin member 20 may be formed in at least one region selected from the group consisting of the first region 111, the second region 121, and the third region 131.

[0142] Second Embodiment Next, a second embodiment will be described.

[0143] The main difference between the second embodiment and the first embodiment is that an insulating layer is provided at the end of the laminate. The following description will focus on the differences from the first embodiment, and the description of the commonalities will be omitted or simplified.

[0144] 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 an insulating layer 40 is provided.

[0145] In this embodiment, one or more insulating layers 40 are provided for each unit cell 100. For example, as shown in Fig. 4, an insulating layer 40A is provided at an end of a unit cell 100A. Similarly, an insulating layer 40B is provided at an end of a unit cell 100B.

[0146] The following describes the insulating layer 40A provided in the unit cell 100A. The insulating layer 40B is the same as the insulating layer 40A, so a description thereof will be omitted. Note that when there is no need to distinguish between the insulating layers 40A and 40B, such as when describing matters common to the insulating layers 40A and 40B, the insulating layers will be described as the insulating layer 40.

[0147] The insulating layer 40 covers 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. 4, the insulating layer 40 covers each of the first region 111, the second region 121, and the third region 131. In the present embodiment, the insulating layer 40 is provided so as to fill the gaps between the second current collector 150 and a part of the first region 111, the second region 121, and the third region 131.

[0148] In this embodiment, a gap 30 is provided between the insulating layer 40 and the first resin member 20. For example, the insulating layer 40 and the first resin member 20 are not in contact with each other. Alternatively, the insulating layer 40 and the first resin member 20 may be in only partial contact with each other. The gap 30 may be a closed space, or may be a space that communicates with the outside of the battery 2.

[0149] The planar shape and arrangement of the insulating layer 40 are not particularly limited, and for example, one insulating layer 40 is provided at each end on the positive and negative sides in the y-axis direction, as in the first resin member 20 of the battery 1 shown in Figure 2. Alternatively, the insulating layer 40 may have an elongated shape extending along the y-axis direction, as in the first resin member 20 of the battery 1A shown in Figure 3A or the first resin member 20 of the battery 1B shown in Figure 3B. Alternatively, the insulating layer 40 may have an irregular shape.

[0150] The thickness of the insulating layer 40 is equal to the thickness of the first resin member 20. Note that the thickness of the first resin member 20 and the thickness of the insulating layer 40 are both lengths in the z-axis direction. Note that, as shown in FIG. 4 , the thickness of the insulating layer 40 is not uniform. In this case, the thickness of the insulating layer 40 is considered to be the maximum thickness of the insulating layer 40. The same applies when the thickness of the first resin member 20 is not uniform. That is, in this embodiment, the maximum value of the thickness of the insulating layer 40 is equal to the maximum value of the thickness of the first resin member 20.

[0151] The insulating layer 40 is formed using an insulating 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 insulating layer 40. Specifically, a silicone resin, an epoxy resin, an acrylic resin, a polyimide resin, or the like can be used for the insulating layer 40.

[0152] The insulating layer 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 insulating layer 40 may be formed by attaching an insulating resin in the form of an adhesive tape. The insulating layer 40 is formed after the first electrode layer 120, the electrolyte layer 130, and the second electrode layer 140 are formed and before the first resin member 20 is formed.

[0153] In the battery 2 according to this embodiment, the insulating layer 40 is provided, which can mechanically and electrically protect the ends of the first electrode layer 120, the electrolyte layer 130, and the second electrode layer 140. This can prevent the ends from collapsing and the occurrence of short circuits. Therefore, the reliability of the battery 2 can be further improved.

[0154] The insulating layer 40 and the first resin member 20 may be partially in contact with each other. Alternatively, the insulating layer 40 and the first resin member 20 may be partially mixed with each other. In other words, the boundary between the insulating layer 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 insulating layer 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 insulating layer 40 and the first resin member 20 can be partially mixed with each other.

[0155] The insulating layer 40 may not be in contact with the second current collector 150. That is, the void 30 may be provided between the insulating layer 40 and the second current collector 150. The insulating layer 40 may not cover 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, the insulating layer 40 may cover the first region 111 and the second region 121 so as to straddle the third region 131 without covering at least a portion of the third region 131. In this case, the void 30 is provided between the insulating layer 40 and the second electrode layer 140. The insulating layer 40 may cover the second region 121 and the third region 131 so as to straddle the first region 111 without covering at least a portion of the first region 111. The insulating layer 40 may discretely cover each of the first region 111 and the third region 131 without covering at least a portion of the second region 121.

[0156] Third Embodiment Next, a third embodiment will be described.

[0157] The main difference between the third 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 third embodiment will be omitted or simplified.

[0158] 5 is a cross-sectional view of the 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 the battery 3 includes a second resin member 50.

[0159] 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. 5 , 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 3.

[0160] 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.

[0161] 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.

[0162] 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 second resin member 50 is formed after the first resin member 20 is formed and after the second current collector 150 is joined.

[0163] In the battery 3 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 3.

[0164] In the battery 3, 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 enters 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.

[0165] Furthermore, 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.

[0166] The position where the second resin member 50 is provided is not limited to the example shown in FIG. 5 . 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 first resin member 20 is provided. The second resin member 50 may also cover only the corners of the laminate 10 in a plan view.

[0167] The second resin member 50 may be provided so as to fill a part of the gap 30. Specifically, in FIG. 5 , the second resin member 50 may be 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.

[0168] Furthermore, the battery 3 may be provided with an insulating layer 40, similar to the battery 2 according to embodiment 2. In this case, the insulating layer 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 insulating layer 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.

[0169] The battery 3 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 3 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.

[0170] (Fourth embodiment) Next, a fourth embodiment will be described.

[0171] The main difference between embodiment 4 and embodiment 1 is the thickness of the first resin member. The following description will focus on the differences from embodiment 1, and the description of the commonalities will be omitted or simplified.

[0172] Fig. 6 is a cross-sectional view of a battery 4 according to the present embodiment. The battery 4 shown in Fig. 6 differs from the battery 1 according to the first embodiment in that it includes a first resin member 21 instead of the first resin member 20.

[0173] One or more first resin members 21 are provided for each unit cell 100. For example, as shown in Fig. 6, a first resin member 21A is provided at an end of a unit cell 100A. Similarly, a first resin member 21B is provided at an end of a unit cell 100B.

[0174] The following describes the first resin member 21A provided in the unit cell 100A. The first resin member 21B is the same as the first resin member 21A, so its description will be omitted. Note that when there is no need to distinguish between the first resin members 21A and 21B, such as when describing matters common to the first resin members 21A and 21B, the first resin member 21A will be described as the first resin member 21.

[0175] The first resin member 21 has a different thickness from the first resin member 20 according to embodiment 1. Specifically, the thickness of the first resin member 21 is smaller than the sum of the thicknesses of the first electrode layer 120, the electrolyte layer 130, and the second electrode layer 140. For example, the thickness of the first resin member 21 is equal to or greater than the sum of the thicknesses of the first electrode layer 120 and the electrolyte layer 130.

[0176] Because the thickness of the first resin member 21 is small, the end of the second current collector 150 is bent as shown in Fig. 6. The bent shape of the second current collector 150 is formed, for example, by pressing after the second current collector 150 is bonded. In the example shown in Fig. 6, the second current collector 150 is bent in a stepped shape with a slope, but the second current collector 150 may be bent so that the slope reaches the end. Furthermore, the end of the second current collector 150 may be curved.

[0177] Furthermore, second current collector 150 does not have to be bent or curved. That is, second current collector 150 may be a flat plate, as in the first embodiment. In this case, gap 30 is provided between first resin member 21, which has a small thickness, and second current collector 150. Alternatively, first resin member 21 may be in contact with second current collector 150, and gap 30 may be provided between first current collector 110 and first resin member 21.

[0178] In this way, even when the first resin member 21 has a small thickness, deformation of the second current collector 150 due to an external force can be suppressed. Therefore, according to the battery 4 of the present embodiment, the occurrence of a short circuit can be suppressed, similar to the battery 1 of the first embodiment.

[0179] The thickness of the first resin member 21 included in the battery 4 does not have to be uniform. Specifically, when the battery 4 is cut in the xz plane, the thickness may vary depending on the cut position. For example, the thickness of the first resin member 21 may be small at one cut position as shown in FIG. 6 , but may be equal to the thickness of the first resin member 20 shown in FIG. 1 at another cut position. At yet another cut position, the thickness may be equal to the thickness of the first resin member 22 as shown in FIG. 7A (described later). That is, the thickness of the first resin member 21 may be smaller, larger, or equal to the sum of the thicknesses of the first electrode layer 120, the electrolyte layer 130, and the second electrode layer 140, depending on the position.

[0180] Next, a modified example of this embodiment will be described. The following description will focus on the differences from the fourth embodiment, and the description of the commonalities will be omitted or simplified.

[0181] <Modification 1> Fig. 7A is a cross-sectional view of a battery 4A according to Modification 1 of the present embodiment. The battery 4A shown in Fig. 7A differs from the battery 4 shown in Fig. 6 in that it includes a first resin member 22 instead of the first resin member 21.

[0182] One or more first resin members 22 are provided for each unit cell 100. For example, as shown in Fig. 7A, a first resin member 22A is provided at an end of a unit cell 100A. Similarly, a first resin member 22B is provided at an end of a unit cell 100B.

[0183] The following describes the first resin member 22A provided in the unit cell 100A. The first resin member 22B is the same as the first resin member 22A, and therefore its description is omitted. Note that when there is no need to distinguish between the first resin members 22A and 22B, such as when describing matters common to the first resin members 22A and 22B, the first resin members 22A and 22B will be described as the first resin member 22.

[0184] The first resin member 22 has a different thickness from the first resin member 20 according to embodiment 1. Specifically, the thickness of the first resin member 22 is greater than the sum of the thicknesses of the first electrode layer 120, the electrolyte layer 130, and the second electrode layer 140. For example, the thickness of the first resin member 22 is equal to or greater than the sum of the thicknesses of the first electrode layer 120, the electrolyte layer 130, the second electrode layer 140, and the second current collector 150.

[0185] Because the thickness of the first resin member 22 is large, the end of the second current collector 150 is bent as shown in Fig. 7A. The bent shape of the second current collector 150 is formed, for example, by pressing the second current collector 150 after bonding. In the example shown in Fig. 7A, the second current collector 150 is bent in a stepped shape with a slope, but the second current collector 150 may be bent so that the slope reaches the end. Furthermore, the end of the second current collector 150 may be curved.

[0186] In this way, even when a thick first resin member 22 is provided, deformation of the second current collector 150 due to an external force can be suppressed. Therefore, according to the battery 4A of this modification, the occurrence of a short circuit can be suppressed, similar to the battery 1 of embodiment 1.

[0187] <Modification 2> Fig. 7B is a cross-sectional view of a battery 4B according to Modification 2 of the present embodiment. The battery 4B shown in Fig. 7B differs from the battery 4 shown in Fig. 6 in that it further includes an insulating layer 40.

[0188] In this modification, the thickness of the first resin member 21 is smaller than the thickness of the insulating layer 40. Note that, as shown in FIG. 7B , the thickness of the insulating layer 40 is not uniform. In this case, the thickness of the insulating layer 40 is regarded as the maximum thickness of the insulating layer 40. The same applies when the thickness of the first resin member 21 is not uniform. That is, in this modification, the maximum value of the thickness of the first resin member 21 is smaller than the maximum value of the thickness of the insulating layer 40.

[0189] In battery 4B, the insulating layer 40 provides mechanical and electrical protection to the ends of the first electrode layer 120, the electrolyte layer 130, and the second electrode layer 140. This prevents the ends from collapsing and short circuits from occurring, further improving the reliability of battery 4B.

[0190] <Modification 3> Fig. 7C is a cross-sectional view of a battery 4C according to Modification 3 of the present embodiment. The battery 4C shown in Fig. 7C differs from the battery 4 shown in Fig. 6 in that it further includes an insulating layer 40.

[0191] In this modification, the thickness of the first resin member 22 is greater than the thickness of the insulating layer 40. Note that, as shown in FIG. 7C , the thickness of the insulating layer 40 is not uniform. In this case, the thickness of the insulating layer 40 is regarded as the maximum thickness of the insulating layer 40. The same applies when the thickness of the first resin member 22 is not uniform. That is, in this modification, the maximum value of the thickness of the first resin member 22 is greater than the maximum value of the thickness of the insulating layer 40.

[0192] In battery 4C, the insulating layer 40 provides mechanical and electrical protection to the ends of the first electrode layer 120, the electrolyte layer 130, and the second electrode layer 140. This prevents the ends from collapsing and short circuits from occurring, further improving the reliability of battery 4C.

[0193] The batteries 4, 4A, 4B, and 4C according to this embodiment and each of the modifications may include a second resin member 50, similar to the battery 3 according to the third embodiment.

[0194] Fifth Embodiment Next, a fifth embodiment will be described.

[0195] The main difference between embodiment 5 and embodiment 1 is that a tab to which a lead for taking out the positive electrode or negative electrode is connected is provided on the current collector. The following description will focus on the differences from embodiment 1, and the description of the commonalities will be omitted or simplified.

[0196] Fig. 8 is a plan view of a battery 5 according to this embodiment. The battery 5 shown in Fig. 8 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 5 also includes a first lead 160 and a second lead 162.

[0197] 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.

[0198] 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.

[0199] 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.

[0200] In this embodiment, the first resin members 20 are disposed near the first tab 112 and the second tab 152. Specifically, one first resin member 20 is disposed so as to be aligned with the first tab 112 along the x-axis direction (the direction in which the tab protrudes). The other first resin member 20 is disposed so as to be aligned with the second tab 152 along the x-axis direction.

[0201] The portion where the second tab 152 is provided is a portion where the second current collector 150 extends outward, and is a portion that is easily deformed when an external force is applied. Therefore, by arranging the first resin member 20 near the second tab 152, deformation of the second current collector 150 can be suppressed, and the possibility of a short circuit can be reduced. The same applies to the first tab 112. In this way, by arranging the first resin member 20 near the first tab 112 and the second tab 152, the reliability of the battery 5 can be improved.

[0202] 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.

[0203] The first lead 160 and the second lead 162 are terminals for extracting the positive and negative electrodes from the battery 5, 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.

[0204] When the battery 5 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 drawn out to the outside of the exterior body. The portions of the first lead 160 and the second lead 162 drawn out to the outside of the exterior body are connected to other substrates or the like, enabling charging and discharging of the battery 5. 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 5.

[0205] The first tab 112, the second tab 152, the first lead 160 and the second lead 162 provided on the battery 5 may also be provided on the batteries according to the above-mentioned embodiments 1 to 4 and their respective modifications.

[0206] 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.

[0207] 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.

[0208] Furthermore, 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 may 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 convex portion protruding toward the first electrode layer 120 may be provided on the underside, and at the end of the first electrode layer 120, a concave portion into which the convex portion is inserted may be provided on the upper surface.

[0209] 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.

[0210] 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.

[0211] 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.

[0212] 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.

[0213] The insulating layer 40 may be formed using the same material as the electrolyte layer 130, as long as it has electronic insulating properties.

[0214] Furthermore, various modifications, substitutions, additions, omissions, etc. can be made to the above-described embodiments within the scope of the claims or their equivalents.

[0215] 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.

[0216] 1, 1A, 1B, 1C, 1D, 1E, 2, 3, 4, 4A, 4B, 4C, 5 Battery 10 Laminate 20, 20A, 20B, 21, 21A, 21B, 22, 22A, 22B First resin member 30, 30A, 30B Void 40, 40A, 40B Insulating layer 50 Second resin member 100, 100A, 100B Unit cell 110 First current collector 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 first resin member, 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, the first resin member is 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, and a gap is provided between the first current collector and the second current collector at the end of the laminate.

2. The battery according to claim 1, wherein the thickness of the first resin member is greater than the thickness of at least one selected from the group consisting of the first electrode layer, the electrolyte layer, and the second electrode layer.

3. The battery according to claim 1, wherein the thickness of the first resin member is equal to the sum of the thicknesses of the first electrode layer, the electrolyte layer, and the second electrode layer.

4. The battery according to claim 1, wherein the thickness of the first resin member is greater than the total thickness of the first electrode layer, the electrolyte layer, and the second electrode layer.

5. The battery according to claim 1, wherein the thickness of the first resin member is smaller than the total thickness of the first electrode layer, the electrolyte layer, and the second electrode layer.

6. The battery according to any one of claims 1 to 5, further comprising an insulating layer covering at least one region selected from the group consisting of the first region, the second region, and the third region.

7. The battery according to claim 6, wherein the thickness of the first resin member is equal to the thickness of the insulating layer.

8. The battery according to claim 6, wherein the thickness of the first resin member is greater than the thickness of the insulating layer.

9. The battery according to claim 6, wherein the thickness of the first resin member is smaller than the thickness of the insulating layer.

10. The battery according to any one of claims 1 to 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.

11. The battery according to claim 10, 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 second resin member.

12. The battery according to claim 10, wherein the first resin member and the second resin member contain different main components.

13. The battery according to claim 10, wherein the first resin member and the second resin member contain the same main component.

14. The battery according to claim 10, wherein the first resin member and the second resin member are in partial contact with each other or partially mixed with each other.

15. The battery according to any one of claims 1 to 5, wherein the first resin member is provided in the first region in the plan view, but is not provided in the second region or the third region.

16. The battery according to any one of claims 1 to 5, wherein the first resin member is not in contact with any of the first electrode layer, the electrolyte layer, and the second electrode layer.

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