Batteries and stacked batteries

Abstract

This battery comprises: a power generation element having at least one battery cell including an electrode layer, a counter electrode layer, and a solid electrolyte layer positioned between the electrode layer and the counter electrode layer; an electrode insulating film; a counter electrode insulating film; an electrode terminal that is electrically connected to the electrode layer; and a counter electrode terminal that is electrically connected to the counter electrode layer. The power generation element has: an electrode main surface that is the main surface constituted by the surface of the electrode layer; a counter electrode main surface facing the electrode main surface, that is the main surface constituted by the surface of the counter electrode layer; and a side surface. The electrode insulating film has: a first side surface covering part that covers a portion of the side surface; and an electrode main surface covering part that covers the electrode main surface. The counter electrode insulating film has: a second side surface covering part that covers another portion of the side surface; and a counter electrode main surface covering part that covers the counter electrode main surface. The electrode terminal has: a counter electrode insulating film covering part that covers the second side surface covering part; and an electrode contact part that contacts the electrode main surface. The counter electrode terminal has: an electrode insulating film covering part that covers the first side surface covering part; and a counter electrode contact part that is in contact with the counter electrode main surface.

Description

[Technical Field]

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

[0002] By extracting current from the power generating element of the battery using lead wires and connecting the batteries in series and / or parallel, it is possible to increase the voltage, output, and battery capacity. As technologies related to such battery structures and battery connections, for example, Patent Document 1 discloses an all-solid-state battery structure in which an insulating material is used on the side walls of the power generating element and current is extracted using tab leads. Patent Document 2 discloses a battery pack in which multiple batteries are connected with tab leads. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-335294 [Patent Document 2] Japanese Patent Application Laid-Open No. 2005-216631 Summary of the Invention [Problem to be solved by the invention]

[0004] In the prior art, there is a need to improve the reliability of batteries.

[0005] The present disclosure provides highly reliable batteries and the like. [Means for solving the problem]

[0006] A battery according to one aspect of the present disclosure includes a power generating element having at least one battery cell including an electrode layer, a counter electrode layer, and a solid electrolyte layer located between the electrode layer and the counter electrode layer, an electrode insulating film, a counter electrode insulating film, an electrode terminal electrically connected to the electrode layer, and a counter electrode terminal electrically connected to the counter electrode layer, and the power generating element has an electrode main surface which is a main surface formed by the surface of the electrode layer, a counter electrode main surface which faces the electrode main surface and is a main surface formed by the surface of the counter electrode layer, and a side surface. the electrode insulating film has a first side surface covering portion covering a part of the side surface and an electrode main surface covering portion covering the electrode main surface; the counter electrode insulating film has a second side surface covering portion covering another part of the side surface and a counter electrode main surface covering portion covering the counter electrode main surface; the electrode terminal has a counter electrode insulating film covering portion covering the second side surface covering portion and an electrode contact portion in contact with the electrode main surface; and the counter electrode terminal has an electrode insulating film covering portion covering the first side surface covering portion and a counter electrode contact portion in contact with the counter electrode main surface.

[0007] A stacked battery according to one aspect of the present disclosure includes a plurality of the above-described batteries, which are electrically connected in parallel and stacked. [Effects of the Invention]

[0008] According to the present disclosure, a highly reliable battery or the like can be realized. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a cross-sectional view and a top view showing a schematic configuration of a battery according to a first embodiment. [Figure 2] FIG. 2 is a cross-sectional view and a top view showing a schematic configuration of a battery according to Modification 1 of Embodiment 1. FIG. [Figure 3] FIG. 3 is a cross-sectional view showing a schematic configuration of another battery according to Modification 1 of Embodiment 1. In FIG. [Figure 4A] FIG. 4A is a top view showing a schematic configuration of a battery according to a second modification of the embodiment. [Figure 4B] FIG. 4B is a bottom view showing a schematic configuration of a battery according to Modification 2 of the embodiment. [Figure 5] FIG. 5 is a top view showing a schematic configuration of another battery according to Modification 2 of Embodiment 1. In FIG. [Figure 6A] FIG. 6A is a top view showing a schematic configuration of a battery according to a third modification of the embodiment. [Figure 6B] FIG. 6B is a bottom view showing a schematic configuration of a battery according to a third modification of the embodiment. [Figure 7] FIG. 7 is a top view showing a schematic configuration of another battery according to Modification 3 of Embodiment 1. In FIG. [Figure 8] FIG. 8 is a cross-sectional view and a top view showing a schematic configuration of a stacked battery according to the second embodiment. [Figure 9] FIG. 9 is a cross-sectional view showing a schematic configuration of a battery according to Modification 1 of Embodiment 2. As shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0010] (Summary of the Disclosure) A battery according to one aspect of the present disclosure includes a power generating element having at least one battery cell including an electrode layer, a counter electrode layer, and a solid electrolyte layer located between the electrode layer and the counter electrode layer, an electrode insulating film, a counter electrode insulating film, an electrode terminal electrically connected to the electrode layer, and a counter electrode terminal electrically connected to the counter electrode layer, and the power generating element has an electrode main surface which is a main surface formed by the surface of the electrode layer, a counter electrode main surface which faces the electrode main surface and is a main surface formed by the surface of the counter electrode layer, and a side surface. the electrode insulating film has a first side surface covering portion covering a part of the side surface and an electrode main surface covering portion covering the electrode main surface; the counter electrode insulating film has a second side surface covering portion covering another part of the side surface and a counter electrode main surface covering portion covering the counter electrode main surface; the electrode terminal has a counter electrode insulating film covering portion covering the second side surface covering portion and an electrode contact portion in contact with the electrode main surface; and the counter electrode terminal has an electrode insulating film covering portion covering the first side surface covering portion and a counter electrode contact portion in contact with the counter electrode main surface.

[0011] This configuration allows for the realization of a highly reliable battery. Conventional batteries have a structure in which terminals are drawn out using lead wires or the like, and are used by connecting to other batteries or loads using the lead wires. However, the lead wires are prone to short-circuiting when they come into contact with the power generating element, and miniaturization is also difficult due to the lead wires' protruding structure. Furthermore, the lead wires are prone to short-circuiting and breakage at the lead wire routing section, which poses reliability issues. These problems become even more pronounced as batteries become smaller and more multi-layered.

[0012] In this embodiment, the electrode insulating film and counter electrode insulating film cover part of the side surface and main surface of the power-generating element. By covering at least part of the end surfaces of the electrode layer and counter electrode layer of the battery with an insulating film, the end surfaces of each layer are bound together, thereby preventing peeling of each layer of the power-generating element. Furthermore, the presence of the insulating film improves isolation between the two electrodes. Furthermore, since the electrode terminal and counter electrode terminal cover the electrode insulating film and counter electrode insulating film and are connected to the electrode main surface and counter electrode main surface to extract current, short circuits and damage to the terminals are less likely to occur compared to when the power-generating element, insulating film, and terminal are integrated and lead wires are drawn out. These effects enable the realization of a highly reliable battery that prevents short circuits between the electrode and counter electrode and damage to the terminals.

[0013] Furthermore, for example, the electrode principal surface may have an electrode exposed region that is not covered by the electrode insulating film and the counter electrode insulating film at a position overlapping with the counter electrode principal surface covering portion in a plan view, the counter electrode principal surface may have a counter electrode exposed region that is not covered by the electrode insulating film and the counter electrode insulating film at a position overlapping with the electrode principal surface covering portion in a plan view, the electrode contact portion may be in contact with the electrode exposed region, and the counter electrode contact portion may be in contact with the counter electrode exposed region.

[0014] With this configuration, the electrode contact portion and the counter electrode contact portion are located on the terminal sides of the electrode principal surface and the counter electrode principal surface, and are in contact with the electrode exposed region and the counter electrode exposed region near the ends of the electrode principal surface and the counter electrode principal surface, respectively. Therefore, the electrode terminal and the counter electrode terminal can be electrically connected to the electrode layer and the counter electrode layer without extending significantly inside the electrode principal surface and the counter electrode principal surface.

[0015] Furthermore, for example, the counter electrode insulating film covering portion may cover the counter electrode main surface covering portion, and the electrode insulating film covering portion may cover the electrode main surface covering portion.

[0016] With this configuration, the electrode terminal and the counter electrode terminal sandwich the end of the power-generating element from both sides in the stacking direction, further suppressing peeling of each layer of the power-generating element. Furthermore, when using stacked batteries, the terminals come into contact and are electrically connected simply by stacking them, making it easy to construct a stacked battery.

[0017] Furthermore, for example, at least one of the electrode insulating film and the counter electrode insulating film may contain a resin.

[0018] With this configuration, the buffering properties of the resin contained in the insulating film improve the battery's shock resistance and durability against thermal shock and stress caused by thermal cycles, etc. Furthermore, the buffering properties of the resin can prevent the terminals covering the insulating film from peeling off even after thermal cycles.

[0019] Also, for example, the side surface may include a first side surface and a second side surface opposite the first side surface, and the first side surface covering portion may cover the first side surface, and the second side surface covering portion may cover the second side surface.

[0020] With this configuration, the electrode insulating film and the counter electrode insulating film sandwich and bind each layer in the power generating element from both ends in a plan view, thereby effectively suppressing peeling of each layer and realizing a battery with high reliability.

[0021] Furthermore, for example, at least one of the electrode terminal and the counter electrode terminal may be made of a conductive material containing resin.

[0022] With this configuration, the cushioning properties of the resin contained in the terminals make it possible to absorb external shocks as well as thermal shocks and stresses caused by thermal cycles, etc., thereby achieving a highly reliable battery.

[0023] Furthermore, for example, the electrode insulating film and the counter electrode insulating film may each contain a first thermosetting resin, the electrode terminal and the counter electrode terminal may each contain a second thermosetting resin, and the curing temperature of the first thermosetting resin may be equal to or higher than the curing temperature of the second thermosetting resin.

[0024] With this configuration, the curing temperature when forming the electrode terminal and the counter electrode terminal can be set to be equal to or lower than the curing temperature of the first thermosetting resin, so that the electrode terminal and the counter electrode terminal can be formed while ensuring the insulation and adhesion of the electrode insulating film and the counter electrode insulating film.

[0025] Furthermore, for example, at least one of the electrode insulating film and the counter electrode insulating film may have a laminated structure of a plurality of insulating layers.

[0026] This configuration reduces the occurrence of defects such as thin areas due to voids and uneven thickness in the insulating film, thereby improving the insulating properties and density of the insulating film. Therefore, when terminals are formed, the conductive material of the terminals is less likely to penetrate into the insulating film, suppressing short circuits. Furthermore, even when a thick insulating film is formed, peeling due to stress caused by curing during insulating film formation is less likely to occur, thereby improving the insulating properties and shock absorption performance of the insulating film.

[0027] Furthermore, for example, the electrode insulating film and the counter electrode insulating film may be in contact with each other between the electrode terminal and the counter electrode terminal.

[0028] This configuration can improve the insulation between the two terminals.

[0029] Furthermore, for example, the at least one battery cell may be a plurality of battery cells, and the plurality of battery cells may be electrically connected in series and stacked.

[0030] This configuration allows for a high voltage to be achieved, resulting in a highly reliable, high-energy battery.

[0031] Furthermore, for example, the solid electrolyte layer may contain a solid electrolyte having lithium ion conductivity.

[0032] This configuration makes it possible to realize a highly reliable lithium ion battery containing a solid electrolyte.

[0033] Furthermore, in one aspect of the present disclosure, each stacked battery includes a plurality of the above-described batteries, and the plurality of batteries are electrically connected in parallel and stacked.

[0034] With this configuration, since the stacked battery is provided with a plurality of the above-described batteries, a highly reliable, large-capacity stacked battery can be realized.

[0035] Furthermore, for example, the plurality of batteries may be stacked such that the electrode principal surfaces or the counter electrode principal surfaces of adjacent batteries among the plurality of batteries are adjacent to each other.

[0036] With this configuration, by stacking identical batteries one above the other, a highly reliable, large-capacity stacked battery can be realized that is suitable for mass production.

[0037] Hereinafter, the embodiments will be specifically described with reference to the drawings.

[0038] The embodiments described below are all comprehensive or specific examples. The numerical values, shapes, materials, components, arrangement positions and connection forms of the components, etc. 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 that are not described in the independent claims that represent the highest concepts are described as optional components.

[0039] Furthermore, in this specification, terms indicating the relationship between elements, such as parallelism, terms indicating the shape of elements, such as rectangular parallelepiped, and numerical ranges are not expressions that only express a strict meaning, but are expressions that also include a substantially equivalent range, for example, a difference of about a few percent.

[0040] In addition, the drawings are not necessarily strict illustrations, and the same reference numerals are used to designate substantially the same components in the drawings, and redundant explanations are omitted or simplified.

[0041] In this specification and drawings, the x-axis, y-axis, and z-axis represent the three axes of a three-dimensional Cartesian coordinate system. In each embodiment, the z-axis direction is the thickness direction of the battery. In this specification, the "thickness direction" refers to the direction perpendicular to the plane on which each layer is stacked.

[0042] In addition, in this specification, "plan view" means when the battery is viewed along the stacking direction of the battery cell, and "thickness" in this specification refers to the length of the battery and each layer in the stacking direction.

[0043] In addition, in this specification, the terms "inside" and "outside" refer to the inside and outside when the battery is viewed along the stacking direction of the battery.

[0044] Furthermore, in this specification, the terms "upper" and "lower" in the battery configuration do not refer to the upper direction (vertically upper) and lower direction (vertically lower) in absolute spatial recognition, but are used as terms defined by a relative positional relationship based on the stacking order in the stacking configuration. Furthermore, the terms "upper" and "lower" 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.

[0045] (Embodiment 1) First, the battery according to the present embodiment will be described.

[0046] Fig. 1 is a cross-sectional view and a top view showing a schematic configuration of a battery according to embodiment 1. Specifically, Fig. 1(a) is a cross-sectional view of a battery 100 according to this embodiment, and Fig. 1(b) is a plan view of the battery 100 as seen from above in the z-axis direction. Fig. 1(a) shows a cross section taken along line Ia-Ia in Fig. 1(b).

[0047] As shown in FIG. 1 , the battery 100 has a thin rectangular parallelepiped structure. The battery 100 includes a power generating element 1 having at least one battery cell 50 including an electrode layer 10, a counter electrode layer 20, and a solid electrolyte layer 30, an electrode insulating film 60, a counter electrode insulating film 70, an electrode terminal 80, and a counter electrode terminal 90. The battery 100 is, for example, an all-solid-state battery. Hereinafter, the electrode insulating film 60 and the counter electrode insulating film 70 may be collectively referred to simply as "insulating films." Furthermore, the electrode terminal 80 and the counter electrode terminal 90 may be collectively referred to simply as "terminals."

[0048] In this embodiment, the power generating element 1 is composed of one battery cell 50. The shape of the power generating element 1 is, for example, a rectangular parallelepiped. The shape of the power generating element 1 is not limited to a rectangular parallelepiped, and may be other shapes such as a cylinder or a polygonal prism. The power generating element 1 has an electrode principal surface 2 which is a main surface formed by the surface of the electrode layer 10, a counter electrode principal surface 3 which is a main surface formed by the surface of the counter electrode layer 20 and faces opposite the electrode principal surface 2, and side surfaces. In this embodiment, the side surfaces of the power generating element 1 are composed of four surfaces, which are two pairs of opposing surfaces, and include a first side surface 6 and a second side surface 7 which are surfaces on the shorter sides of the power generating element 1 in a plan view.

[0049] The electrode principal surface 2 and the counter electrode principal surface 3 are surfaces perpendicular to the stacking direction of the power-generating element 1. The electrode principal surface 2 is formed by the principal surface of the electrode layer 10 opposite to the solid electrolyte layer 30 side. The electrode principal surface 2 has an electrode exposed region 4 that is not covered by the electrode insulating film 60 and the counter electrode insulating film 70 at a position overlapping with a counter electrode principal surface covering portion 72 described later in a plan view. The counter electrode principal surface 3 is formed by the principal surface of the counter electrode layer 20 opposite to the solid electrolyte layer 30 side. The counter electrode principal surface 3 has a counter electrode exposed region 5 that is not covered by the electrode insulating film 60 and the counter electrode insulating film 70 at a position overlapping with an electrode principal surface covering portion 62 described later in a plan view.

[0050] The first side surface 6 and the second side surface 7 extend from the ends of the electrode principal surface 2 and the counter electrode principal surface 3 in a direction intersecting the electrode principal surface 2 and the counter electrode principal surface 3, and are surfaces that connect the electrode principal surface 2 and the counter electrode principal surface 3. In this embodiment, the first side surface 6 and the second side surface 7 are surfaces parallel to the stacking direction of the power generating element 1. The first side surface 6 and the second side surface 7 are positioned opposite each other. Furthermore, the first side surface 6 and the second side surface 7 are parallel to each other.

[0051] At least a portion of the main surface and side surface of the power generating element 1 may be processed into an uneven, rough surface to improve adhesion with the electrode insulating film 60 and the counter electrode insulating film 70. For example, at least a portion of the main surface and side surface of the power generating element 1 may be polished with abrasive paper of #800 to #1000 to obtain an uneven, rough surface, after which the electrode insulating film 60 and the counter electrode insulating film 70 are applied. In this case, the surface roughness may be, for example, a maximum height Rz of 10 μm or more and 20 μm or less. This allows the surface energy of the power generating element 1 to be dispersed, reducing the effects of surface tension, improving wettability during application of the insulating film and increasing shape accuracy. This improves the positional accuracy between the insulating film and the terminals formed on the insulating film, thereby suppressing short circuits. Furthermore, the increased surface roughness increases the surface area of ​​the power generating element 1, which improves adhesion between the surface of the power generating element 1 and the insulating film.

[0052] The battery cell 50 includes an electrode layer 10, a counter electrode layer 20, and a solid electrolyte layer 30 located between the electrode layer 10 and the counter electrode layer 20. The electrode layer 10 includes an electrode current collector 11 and an electrode active material layer 12 located between the electrode current collector 11 and the solid electrolyte layer 30. The counter electrode layer 20 includes a counter electrode current collector 21 and a counter electrode active material layer 22 located between the counter electrode current collector 21 and the solid electrolyte layer 30. In other words, the battery cell 50 includes the electrode current collector 11, the electrode active material layer 12 arranged in contact with the electrode current collector 11, the counter electrode current collector 21, the counter electrode active material layer 22 arranged in contact with the counter electrode current collector 21, and the solid electrolyte layer 30 located between the electrode active material layer 12 and the counter electrode active material layer 22 and including a solid electrolyte. The electrode active material layer 12 and the counter electrode active material layer 22 are disposed between the electrode current collector 11 and the counter electrode current collector 21. The battery cell 50 has a structure in which the electrode layer 10, the solid electrolyte layer 30, and the counter electrode layer 20 are stacked in this order. More specifically, the battery cell 50 has a structure in which the electrode current collector 11, the electrode active material layer 12, the solid electrolyte layer 30, the counter electrode active material layer 22, and the counter electrode current collector 21 are stacked in this order.

[0053] The electrode current collector 11, the electrode active material layer 12, the solid electrolyte layer 30, the counter electrode active material layer 22, and the counter electrode current collector 21 are each rectangular in plan view. The shapes of the electrode current collector 11, the electrode active material layer 12, the solid electrolyte layer 30, the counter electrode active material layer 22, and the counter electrode current collector 21 in plan view are not particularly limited, and may be shapes other than rectangular, such as circular, elliptical, or polygonal.

[0054] The electrode current collector 11, the electrode active material layer 12, the solid electrolyte layer 30, the electrode active material layer 12, and the counter electrode active material layer 22 have the same shape, position, and size in a planar view. The electrode current collector 11, the electrode active material layer 12, the solid electrolyte layer 30, the electrode active material layer 12, and the counter electrode active material layer 22 may have different shapes, positions, and sizes in a planar view. For example, the counter electrode active material layer 22 may be larger than the electrode active material layer 12 in a planar view. Furthermore, the solid electrolyte layer 30 may be larger than the electrode active material layer 12 and the counter electrode active material layer 22, cover the side surfaces of the electrode active material layer 12 and the counter electrode active material layer 22, and be in contact with the electrode current collector 11 and the electrode active material layer 12.

[0055] In this embodiment, the main surface of the electrode current collector 11 opposite to the electrode active material layer 12 side constitutes the electrode main surface 2.

[0056] The electrode active material layer 12 is laminated in contact with one main surface of the electrode current collector 11. Note that another layer, such as a bonding layer made of a conductive material, may be provided between the electrode current collector 11 and the electrode active material layer 12. The electrode layer 10 does not need to include the electrode current collector 11. For example, a current collector of another electrode layer 10 or counter electrode layer 20, a terminal for extraction, or a substrate supporting the battery 100 may function as a current collector for the electrode active material layer 12. In other words, the electrode layer 10 may include only the electrode active material layer 12 of the electrode current collector 11 and the electrode active material layer 12.

[0057] In this embodiment, the main surface of counter electrode current collector 21 opposite to counter electrode active material layer 22 constitutes counter electrode main surface 3.

[0058] The counter electrode active material layer 22 is laminated in contact with one main surface of the counter electrode current collector 21. Note that another layer, such as a bonding layer made of a conductive material, may be provided between the counter electrode current collector 21 and the counter electrode active material layer 22. The counter electrode layer 20 does not need to include the counter electrode current collector 21. For example, a current collector of another electrode layer 10 or the counter electrode layer 20, a terminal for taking out, or a substrate supporting the battery 100 may function as a current collector for the counter electrode active material layer 22. In other words, the counter electrode layer 20 may include only the counter electrode active material layer 22 out of the counter electrode current collector 21 and the counter electrode active material layer 22.

[0059] In the present disclosure, one of the electrode layer 10 and the counter electrode layer 20 is, for example, a positive electrode layer having a positive electrode active material layer and a positive electrode current collector as the electrode active material layer 12 and the electrode current collector 11, and the other is a negative electrode layer having a negative electrode active material layer and a negative electrode current collector as the counter electrode active material layer 22 and the counter electrode current collector 21. Hereinafter, the positive electrode active material layer and the negative electrode active material layer may be collectively referred to simply as "active material layer." Furthermore, the positive electrode current collector and the negative electrode current collector may be collectively referred to simply as "current collector."

[0060] The current collector may be made of any conductive material, and the material is not particularly limited. For example, a foil, plate, or mesh-like material made of stainless steel, nickel, aluminum, iron, titanium, copper, palladium, gold, platinum, or an alloy of two or more of these metals may be used. The current collector material may be appropriately selected taking into consideration the manufacturing process, the operating temperature, and the operating pressure, and the battery operating potential and conductivity applied to the current collector. The current collector material may also be selected according to the required tensile strength and heat resistance. For example, the current collector may be a high-strength electrolytic copper foil or a clad material in which different metal foils are laminated.

[0061] The thickness of the current collector is, for example, in the range of 10 μm or more and 100 μm or less, but even if it is less than 10 μm, it is set within a range that satisfies characteristics such as handling in the manufacturing process, current amount, and reliability.

[0062] The positive electrode active material layer contains at least a positive electrode active material. The positive electrode active material layer is a layer mainly composed of a positive electrode material such as a positive electrode active material. The positive electrode active material is a material in which metal ions such as lithium (Li) ions or magnesium (Mg) ions are inserted or extracted into or from the crystal structure at a potential higher than that of the negative electrode, and oxidation or reduction occurs accordingly. The type of positive electrode active material can be appropriately selected depending on the type of battery, and known positive electrode active materials can be used.

[0063] The positive electrode active material may be a compound containing lithium and a transition metal element, more specifically, an oxide containing lithium and a transition metal element, a phosphate compound containing lithium and a transition metal element, etc. Examples of the oxide containing lithium and a transition metal element include LiNi x M 1-xLithium nickel composite oxides such as O2 (where M is at least one element selected from Co, Al, Mn, V, Cr, Mg, Ca, Ti, Zr, Nb, Mo, and W, and x satisfies 0 < x ≤ 1), lithium cobalt oxide (LiCoO2), lithium nickel oxide (LiNiO2), layered oxides such as lithium manganese oxide (LiMn2O4), and lithium manganese oxides having a spinel structure (LiMn2O4, Li2MnO3, LiMnO2) are used. As the phosphate compound containing lithium and a transition metal element, for example, lithium iron phosphate (LiFePO4) having an olivine structure is used. Further, sulfides such as sulfur (S) and lithium sulfide (Li2S) can also be used as the positive electrode active material. In that case, a material obtained by coating or adding lithium niobate (LiNbO3) or the like to the positive electrode active material particles can be used as the positive electrode active material. Note that only one of these materials may be used as the positive electrode active material, or two or more of these materials may be combined and used.

[0064] As described above, the positive electrode active material layer only needs to contain at least a positive electrode active material. The positive electrode active material layer may be a mixture layer composed of a mixture of a positive electrode active material and other additive materials. As the other additive materials, for example, solid electrolytes such as inorganic solid electrolytes or sulfide solid electrolytes, conductive aids such as acetylene black, and binders such as polyethylene oxide or polyvinylidene fluoride can be used. By mixing the positive electrode active material and other additive materials such as a solid electrolyte at a predetermined ratio, the lithium ion conductivity in the positive electrode active material layer can be improved, and the electron conductivity can also be improved. As the solid electrolyte, for example, the solid electrolyte exemplified as the solid electrolyte of the solid electrolyte layer 30 described later can be used.

[0065] Note that the thickness of the positive electrode active material layer is, for example, 5 μm or more and 300 μm or less. <>

[0066] [[ID=><11]] The negative electrode active material layer contains at least a negative electrode active material. The negative electrode active material layer is a layer mainly composed of a negative electrode material such as a negative electrode active material. The negative electrode active material is a material in which metal ions such as lithium (Li) ions or magnesium (Mg) ions are inserted or extracted into or from the crystal structure at a potential lower than that of the positive electrode, and oxidation or reduction occurs accordingly. The type of negative electrode active material can be appropriately selected depending on the type of battery, and known negative electrode active materials can be used.

[0067] Examples of the negative electrode active material include carbon materials such as natural graphite, artificial graphite, graphite carbon fiber, and resin-baked carbon, as well as alloy materials that are mixed with a solid electrolyte. Examples of alloy materials include LiAl, LiZn, LiBi, LiCd, LiSb, LiSi, and Li. 4.4 Pb, Li 4.4 Sn, Li 0.17 C, lithium alloys such as LiC6, lithium titanate (Li4Ti5O 12 ), oxides of lithium and transition metal elements such as zinc oxide (ZnO) and silicon oxide (SiO x ) and other metal oxides can be used. The negative electrode active material may be made of only one of these materials, or a combination of two or more of these materials.

[0068] As described above, the negative electrode active material layer may contain at least a negative electrode active material. The negative electrode active material layer may be a mixture layer composed of a mixture of a negative electrode active material and other additive materials. Examples of other additive materials include solid electrolytes such as inorganic solid electrolytes or sulfide-based solid electrolytes, conductive additives such as acetylene black, and adhesive binders such as polyethylene oxide or polyvinylidene fluoride. By mixing the negative electrode active material with other additive materials, such as a solid electrolyte, in a predetermined ratio, the negative electrode active material layer can improve both lithium ion conductivity and electronic conductivity. Examples of solid electrolytes that can be used include those exemplified as the solid electrolyte of the solid electrolyte layer 30 described below.

[0069] The thickness of the negative electrode active material layer is, for example, 5 μm or more and 300 μm or less.

[0070] The solid electrolyte layer 30 is disposed between the electrode active material layer 12 and the counter electrode active material layer 22 and is in contact with the electrode active material layer 12 and the counter electrode active material layer 22 .

[0071] The solid electrolyte layer 30 includes at least a solid electrolyte. The solid electrolyte layer 30 includes, for example, a solid electrolyte as a main component. The solid electrolyte may be any known solid electrolyte for batteries that does not have electronic conductivity but has ionic conductivity. For example, a solid electrolyte that conducts metal ions such as lithium ions or magnesium ions may be used. The type of solid electrolyte may be selected appropriately depending on the type of conductive ions. For example, an inorganic solid electrolyte such as a sulfide-based solid electrolyte or an oxide-based solid electrolyte may be used. For example, a lithium-containing sulfide such as a Li2S-P2S5-based, Li2S-SiS2-based, Li2S-B2S3-based, Li2S-GeS2-based, Li2S-SiS2-LiI-based, Li2S-SiS2-Li3PO4-based, Li2S-Ge2S2-based, Li2S-GeS2-P2S5-based, or Li2S-GeS2-ZnS-based solid electrolyte may be used as the sulfide-based solid electrolyte. Examples of oxide-based solid electrolytes include lithium-containing metal oxides such as Li2O-SiO2 and Li2O-SiO2-P2O5; x P y O 1-z N z Lithium-containing metal nitrides such as lithium phosphate (LiPO), lithium-containing transition metal oxides such as lithium titanium oxide, etc. As the solid electrolyte, only one of these materials may be used, or two or more of these materials may be used in combination.

[0072] In addition to the solid electrolyte, the solid electrolyte layer 30 may contain an adhesive binder such as polyethylene oxide or polyvinylidene fluoride.

[0073] The thickness of the solid electrolyte layer 30 is, for example, not less than 5 μm and not more than 150 μm.

[0074] The solid electrolyte material may be composed of an aggregate of particles or a sintered structure.

[0075] As described above, the battery 100 includes the electrode insulating film 60, the counter electrode insulating film 70, the electrode terminal 80, and the counter electrode terminal 90. The electrode insulating film 60 and the counter electrode insulating film 70 cover the first side surface 6 and the second side surface 7, which are both short side surfaces of the power generating element 1 in a planar view. The electrode terminal 80 and the counter electrode terminal 90 contact the electrode insulating film 60 and the counter electrode insulating film 70, respectively. The electrode terminal 80 and the counter electrode terminal 90 are disposed opposite each other. By covering the first side surface 6 and the second side surface 7, which are both ends of the power generating element 1 in a planar view, with an insulating film in this way, the layers in the power generating element 1 can be bound from both ends in a planar view, effectively preventing peeling of the layers. Note that the electrode insulating film 60 and the counter electrode insulating film 70 may cover adjacent sides of the side surfaces of the power generating element 1, rather than opposing sides.

[0076] The electrode insulating film 60 has a first side surface covering portion 61 that covers a part of the side surface of the power generating element 1, and an electrode main surface covering portion 62 that covers the electrode main surface 2. In this embodiment, the electrode insulating film 60 does not cover the counter electrode main surface 3. This makes it possible to widen the counter electrode exposed region 5. The electrode insulating film 60 may also cover a part of the counter electrode main surface 3.

[0077] The first side surface covering portion 61, for example, contacts the first side surface 6 to cover the first side surface 6 and is joined to the first side surface 6. The first side surface covering portion 61 continuously covers, for example, the first side surface 6 from the end of the first side surface 6 on the electrode principal surface 2 side to the end of the first side surface 6 on the counter electrode principal surface 3 side. In the example shown in FIG. 1 , the first side surface covering portion 61 covers the entire first side surface 6. The first side surface covering portion 61 also covers a portion of the side surface on the long side of the power generating element 1 in a plan view (i.e., the XZ plane of the power generating element 1), which is a surface adjacent to the first side surface 6. The first side surface covering portion 61 may cover the entire side surface on the long side of the power generating element 1 in a plan view. The first side surface covering portion 61 may also cover a portion of the counter electrode principal surface 3.

[0078] The electrode principal surface covering portion 62 is, for example, in contact with the electrode principal surface 2 and is bonded to the electrode principal surface 2. The electrode principal surface covering portion 62 covers the end portion of the electrode principal surface 2. The electrode principal surface covering portion 62 covers, for example, the surface of the electrode current collector 11.

[0079] The first side surface covering portion 61 and the electrode main surface covering portion 62 are continuous and connected. In other words, the electrode insulating film 60 wraps around from the first side surface 6 onto the electrode main surface 2, which is formed by the main surface of the electrode current collector 11, and continuously covers the ridge line between the first side surface 6 and the electrode main surface 2.

[0080] The counter electrode insulating film 70 has a second side surface covering portion 71 that covers another portion of the side surface of the power generating element 1, and a counter electrode main surface covering portion 72 that covers the counter electrode main surface 3. In this embodiment, the counter electrode insulating film 70 does not cover the electrode main surface 2. This makes it possible to widen the electrode exposed region 4. Note that the counter electrode insulating film 70 may cover a portion of the electrode main surface 2.

[0081] The second side surface covering portion 71, for example, contacts the second side surface 7, covers the second side surface 7, and is joined to the second side surface 7. The second side surface covering portion 71 continuously covers, for example, the second side surface 7 from the end of the second side surface 7 on the electrode principal surface 2 side to the end of the second side surface 7 on the counter electrode principal surface 3 side. In the example shown in FIG. 1 , the second side surface covering portion 71 covers the entire second side surface 7. The second side surface covering portion 71 also covers a portion of the side surface on the long side of the power generating element 1 in a planar view (i.e., the XZ plane of the power generating element 1), which is a surface adjacent to the second side surface 7. The second side surface covering portion 71 may cover the entire side surface on the long side of the power generating element 1 in a planar view. The second side surface covering portion 71 may also cover a portion of the electrode principal surface 2.

[0082] The counter electrode main surface covering portion 72 is in contact with, for example, the counter electrode main surface 3 and is bonded to the counter electrode main surface 3. The counter electrode main surface covering portion 72 covers the end portion of the counter electrode main surface 3. The counter electrode main surface covering portion 72 covers, for example, the surface of the counter electrode current collector 21.

[0083] The second side surface covering portion 71 and the counter electrode main surface covering portion 72 are continuous and connected. That is, the counter electrode insulating film 70 wraps around from the second side surface 7 onto the counter electrode main surface 3 which is formed by the main surface of the counter electrode current collector 21, and continuously covers the ridge line between the second side surface 7 and the counter electrode main surface 3.

[0084] As described above, in this embodiment, the insulating film continuously covers the corners and ridges located at the ends of the first side surface 6 and the second side surface 7 of the power generating element 1, including part of the side surface end portions on the long sides in a plan view. This insulating film configuration that covers the corners and ridges provides stronger protection for the power generating element 1 while also providing the effect of fixing the corners of the power generating element 1, which are prone to peeling, thereby further improving the reliability of the battery 100.

[0085] The insulating film may be any electrical insulator. The insulating film may include, for example, a resin. The insulating film may include, for example, an insulating resin as a main component. Examples of resins include epoxy resins, acrylic resins, polyimide resins, and silsesquioxane. Specifically, the insulating film may include a coatable thermosetting resin, such as a liquid or powder thermosetting epoxy resin. By applying such a coatable thermosetting resin in liquid or powder form to the side surfaces and main surfaces of the power generating element 1 and thermally curing it, the side surfaces and main surfaces of the power generating element 1 can be covered with the insulating film, bonded, and fixed. The insulating film may also have a laminated structure of multiple insulating layers made of the same or different materials.

[0086] The insulating film may be made of a material softer than the components of the power generating element 1 (e.g., the current collector, the active material, and the solid electrolyte). The Young's modulus of the insulating film is, for example, 10 GPa or more and 40 GPa or less. Specifically, an epoxy resin with a Young's modulus in this range may be used for the insulating film. This makes it possible to absorb impacts on the areas covered with the insulating film and protect the battery 100. Furthermore, even in a thermal cycle environment, the relatively soft insulating film absorbs stress acting on the interface between the insulating film and the side surface of the power generating element 1, etc., due to the difference in the thermal expansion coefficient between the insulating film and the power generating element 1. This makes it possible to suppress adverse effects on the structure of each component of the battery 100, such as the occurrence of cracks or peeling.

[0087] The softness of the constituent material of the power generating element 1 and the insulating film (for example, elastic modulus such as Young's modulus) can be measured by applying a rigid indenter in the same way as in measuring Vickers hardness, and comparing the size of the traces left behind to compare the relative softness of the constituent material of the power generating element 1 and the insulating film. For example, when the indenter is pressed with the same force against each part of the cross section of the power generating element 1, if the insulating film is in a state where it is more deeply indented than the constituent material of the power generating element 1, it can be determined that the insulating film is softer than the constituent material of the power generating element 1.

[0088] Furthermore, in order to alleviate stress on the power generating element 1 caused by expansion or contraction due to temperature changes, alleviate thermal stress, and ensure reliability of the bond with the side wall, the insulating film may be made of a material that is softer than the current collector and contains various resin materials.

[0089] For example, the Young's modulus of the insulating film is lower than the Young's modulus of the metals constituting the electrode current collector 11 and the counter electrode current collector 21. As a result, the stress on the power generating element 1 caused by temperature changes of the current collectors is alleviated by deformation of the insulating film.

[0090] Furthermore, from the viewpoint of alleviating stress on the power generating element 1 caused by expansion or contraction of the solid electrolyte layer 30 due to temperature changes and repeated charging and discharging, and improving the reliability of the battery 100, the Young's modulus of the insulating film may be lower than that of the solid electrolyte layer 30.

[0091] Furthermore, from the viewpoint of alleviating stress on the power generating element 1 caused by expansion or contraction of the electrode active material layer 12 and the counter electrode active material layer 22 due to temperature changes and improving the reliability of the battery 100, the Young's modulus of the insulating film may be lower than the Young's modulus of the electrode active material layer 12 and the counter electrode active material layer 22. The relative relationship between these Young's moduli can be compared, for example, from the displacement characteristics with respect to pressure when a probe is pressed into them, the size relationship of the depressions, or the like.

[0092] The electrode insulating film 60 and the counter electrode insulating film 70 may be made of the same material or different materials. When the electrode insulating film 60 and the counter electrode insulating film 70 are made of different materials, the material, physical properties, etc. of the insulating film described above may be satisfied by at least one of the electrode insulating film 60 and the counter electrode insulating film 70.

[0093] The thickness of the insulating film may be uniform or non-uniform. From the viewpoint of electrical insulation, the thickness of the thinnest part of the insulating film may be 10 μm or more. From the viewpoint of shock absorption, the thickness of the thinnest part of the insulating film may be 100 μm or more. From the viewpoint of blocking air and moisture, the thickness of the thinnest part of the insulating film may be 1 mm or more. There is no particular upper limit to the thickness of the insulating film. The insulating film may be set to an appropriate thickness that satisfies both the weight energy density and volume energy density of the battery and the protective effect of the insulating film. From the viewpoint of reducing the thickness of the battery 100, which has a significant impact on the volume energy density, and protecting the side surfaces of the power generating element 1, which are easily damaged by impact, the thickness of the electrode principal surface covering portion 62 may be smaller than the thickness of the first side surface covering portion 61. Similarly, the thickness of the counter electrode principal surface covering portion 72 may be smaller than the thickness of the second side surface covering portion 71.

[0094] The electrode terminal 80 is a film-like member that covers the counter electrode insulating film 70 from the outside and is electrically connected to the electrode layer 10. In detail, the electrode terminal 80 extends from the outer surface of the counter electrode insulating film 70 around to the electrode main surface 2 that is the main surface of the electrode current collector 11, and continuously covers the counter electrode insulating film 70 and at least a part of the electrode main surface 2. The electrode terminal 80 covers both sides in the stacking direction and the ends of the power generating element 1 from the outside of the power generating element 1. The electrode terminal 80 does not contact the side surface of the power generating element 1 or the counter electrode main surface 3. The electrode terminal 80 may contact the side surface of the power generating element 1 as long as it does not contact the counter electrode layer 20.

[0095] The electrode terminal 80 has a counter electrode insulating film covering portion 81 that covers the second side surface covering portion 71 of the counter electrode insulating film 70, and an electrode contact portion 82 that contacts the electrode main surface 2. The counter electrode insulating film covering portion 81 and the electrode contact portion 82 are continuous and connected to each other.

[0096] The counter electrode insulating film covering portion 81 covers the outside of the counter electrode insulating film 70, in other words, the surface of the counter electrode insulating film 70 opposite to the power-generating element 1 side. The counter electrode insulating film covering portion 81 is, for example, in contact with the outside surface of the counter electrode insulating film 70 and is joined to the counter electrode insulating film 70. The counter electrode insulating film covering portion 81 covers at least the second side surface covering portion 71. In the present embodiment, the counter electrode insulating film covering portion 81 covers the second side surface covering portion 71 and the counter electrode main surface covering portion 72 of the counter electrode insulating film 70 from the outside and is in contact with the second side surface covering portion 71 and the counter electrode main surface covering portion 72. In other words, the counter electrode insulating film covering portion 81 wraps around from the outer surface of the second side surface covering portion 71 of the counter electrode insulating film 70 to the outer surface of the counter electrode main surface covering portion 72, covering the counter electrode insulating film 70. The counter electrode insulating film covering portion 81 covers a portion of the counter electrode main surface covering portion 72. In plan view, the inner end of the counter electrode insulating film covering portion 81 is located outward from the inner end of the counter electrode main surface covering portion 72. In this way, the counter electrode insulating film covering portion 81 covers the counter electrode main surface covering portion 72, thereby forming a structure in which the electrode terminal 80 sandwiches the end of the power generating element 1 in the stacking direction, thereby suppressing peeling of the layers of the power generating element 1. Note that the counter electrode insulating film covering portion 81 does not have to cover the counter electrode main surface covering portion 72.

[0097] The electrode contact portion 82 covers at least a portion of the electrode principal surface 2 and is bonded to the electrode principal surface 2. The electrode contact portion 82 is electrically connected to, for example, the electrode current collector 11. The electrode contact portion 82 is in contact with the electrode exposed region 4 on the electrode principal surface 2. As a result, the electrode contact portion 82 is in contact with the electrode exposed region 4 located near the end of the electrode principal surface 2 on the electrode terminal 80 side, so that the electrode terminal 80 does not need to extend significantly inside the electrode principal surface 2, and the electrode terminal 80 and the electrode layer 10 can be easily electrically connected. In a plan view, the inner end of the portion where the counter electrode insulating film covering portion 81 covers the counter electrode principal surface covering portion 72 and the inner end of the portion where the electrode contact portion 82 covers the electrode principal surface 2 are, for example, at the same position.

[0098] The counter electrode terminal 90 is a film-like member that covers the electrode insulating film 60 from the outside and is electrically connected to the counter electrode layer 20. In detail, the counter electrode terminal 90 wraps around from the outer surface of the electrode insulating film 60 to the counter electrode main surface 3, which is the main surface of the counter electrode current collector 21, and continuously covers the electrode insulating film 60 and at least a portion of the counter electrode main surface 3. The counter electrode terminal 90 covers both sides in the stacking direction and the ends of the power generating element 1 from the outside of the power generating element 1. The counter electrode terminal 90 is not in contact with the side surfaces of the power generating element 1 or the electrode main surfaces 2. The counter electrode terminal 90 may be in contact with the side surfaces of the power generating element 1 as long as it is not in contact with the electrode layer 10.

[0099] The counter electrode terminal 90 has an electrode insulating film covering portion 91 that covers the first side surface covering portion 61 of the electrode insulating film 60, and a counter electrode contact portion 92 that contacts the counter electrode main surface 3. The electrode insulating film covering portion 91 and the counter electrode contact portion 92 are continuous and connected to each other.

[0100] The electrode insulating film covering portion 91 covers the outside of the electrode insulating film 60, in other words, the surface of the electrode insulating film 60 opposite to the power-generating element 1 side. The electrode insulating film covering portion 91 is, for example, in contact with the outer surface of the electrode insulating film 60 and is bonded to the electrode insulating film 60. The electrode insulating film covering portion 91 covers at least the first side surface covering portion 61. In this embodiment, the electrode insulating film covering portion 91 covers the first side surface covering portion 61 and the electrode principal surface covering portion 62 of the electrode insulating film 60 from the outside and is in contact with the first side surface covering portion 61 and the electrode principal surface covering portion 62. In other words, the electrode insulating film covering portion 91 wraps around from the outer surface of the first side surface covering portion 61 of the electrode insulating film 60 to the outer surface of the electrode principal surface covering portion 62, covering the electrode insulating film 60. The electrode insulating film covering portion 91 covers a portion of the electrode principal surface covering portion 62. In a plan view, the inner end of the electrode insulating film covering portion 91 is located outward of the inner end of the electrode principal surface covering portion 62. In this way, the electrode insulating film covering portion 91 covers the electrode main surface covering portion 62, thereby forming a structure in which the counter electrode terminal 90 sandwiches the end portion of the power generating element 1 in the stacking direction, thereby suppressing peeling of the layers of the power generating element 1. Note that the electrode insulating film covering portion 91 does not have to cover the electrode main surface covering portion 62.

[0101] The counter electrode contact portion 92 covers at least a portion of the counter electrode main surface 3 and is bonded to the counter electrode main surface 3. The counter electrode contact portion 92 is electrically connected to, for example, the counter electrode current collector 21. The counter electrode contact portion 92 is in contact with the counter electrode exposed region 5 on the counter electrode main surface 3. This allows the counter electrode contact portion 92 to be in contact with the counter electrode exposed region 5 located near the end of the counter electrode main surface 3 on the counter electrode terminal 90 side. This eliminates the need for the counter electrode terminal 90 to extend significantly inside the counter electrode main surface 3, and allows the counter electrode terminal 90 and the counter electrode layer 20 to be easily electrically connected. In a plan view, the inner end of the portion where the electrode insulating film covering portion 91 covers the electrode main surface covering portion 62 and the inner end of the portion where the counter electrode contact portion 92 covers the counter electrode main surface 3 are, for example, at the same position.

[0102] The terminals are made of a conductive material having electronic conductivity. From the viewpoint of alleviating stress on the power generating element 1 caused by expansion or contraction of each layer of the power generating element 1 due to temperature changes, the terminals are made of a conductive material containing, for example, a resin. For example, the Young's modulus of the terminals is lower than that of the metals constituting the electrode current collector 11 and the counter electrode current collector 21. As a result, stress on the terminals caused by temperature changes is alleviated by deformation of the terminals themselves and deformation of the insulating film underlying the terminals. Because the terminals can deform together with the insulating film, they can follow deformation of the power generating element 1 caused by thermal shock and charge / discharge cycles, thereby suppressing peeling and damage to the power generating element 1. Furthermore, from the viewpoint of alleviating stress on the power generating element 1 and improving the reliability of the battery 100, the Young's modulus of the terminals may be lower than that of the solid electrolyte layer 30. Furthermore, from the viewpoint of alleviating stress on the power generating element 1 caused by expansion or contraction of the electrode active material layer 12 and the counter electrode active material layer 22 due to temperature changes and improving the reliability of the battery 100, the Young's modulus of the terminal may be lower than the Young's modulus of the electrode active material layer 12 and the counter electrode active material layer 22. The relative relationship between these Young's moduli can be compared, for example, from the displacement characteristics with respect to pressure when a probe is pressed into it, the size of the depression, or the like.

[0103] The conductive material constituting the terminals may include, for example, at least one of silver, copper, nickel, zinc, aluminum, palladium, gold, platinum, and alloys of these metals. The terminals may also be made of a material in which conductive particles or particles of a semiconductor material are contained in a solid electrolyte. This reduces the resistance component while mitigating the stress caused by the expansion or contraction of the current collector due to temperature changes, as described above, thereby achieving a high-capacity battery with low loss.

[0104] Furthermore, the terminals may be made of a material in which a solid electrolyte or the like is contained in a conductive resin paste, from the viewpoint of being able to adjust the coefficient of thermal expansion and softness (Young's modulus).

[0105] The resin contained in the conductive material constituting the terminal may be a thermoplastic resin or a thermosetting resin, and among these, from the viewpoint of easily forming the terminal, the terminal may contain a thermosetting resin.

[0106] When both the terminal and the insulating film contain resin, the processing temperature of the resin contained in the terminal is lower than the processing temperature of the resin contained in the insulating film. In the case of a thermosetting resin, the processing temperature is, for example, a curing temperature for accelerating the thermosetting of the resin. In the case of a thermoplastic resin, the processing temperature is, for example, a phase transition temperature (e.g., glass transition point or melting point) for the resin to flow. When the insulating film contains a first thermosetting resin and the terminal contains a second thermosetting resin, for example, the curing temperature of the first thermosetting resin is equal to or higher than the curing temperature of the second thermosetting resin. This allows the curing temperature during the formation of the terminal to be equal to or lower than the curing temperature of the first thermosetting resin contained in the insulating film. Therefore, it is possible to form the terminal while suppressing deterioration of the insulating film properties and suppressing peeling and cracking of the insulating film.

[0107] Examples of thermoplastic resins include polyethylene resins, polypropylene resins, acrylic resins, polystyrene resins, vinyl chloride resins, silicone resins, polyamide resins, polyimide resins, fluorinated hydrocarbon resins, polyether resins, butadiene rubber, isoprene rubber, styrene-butadiene rubber (SBR), styrene-butadiene-styrene copolymer (SBS), styrene-ethylene-butadiene-styrene copolymer (SEBS), ethylene-propylene rubber, butyl rubber, chloroprene rubber, and acrylonitrile-butadiene rubber.

[0108] Examples of thermosetting resins include (i) amino-based resins such as urea-based resins, melamine-based resins, and guanamine-based resins; (ii) epoxy-based resins such as bisphenol A-type, bisphenol F-type, phenol novolac-type, and alicyclic-type; (iii) oxetane-based resins; (iv) phenol-based resins such as resol-type and novolac-type; and (v) silicone-modified organic resins such as silicone epoxy and silicone polyester.

[0109] The terminals may be made of a material having pores or bubbles containing air, etc. Such a structure allows the softness (e.g., Young's modulus) to be controlled over a wide range, thereby further reducing stress on the power generating element 1 caused by expansion or contraction of each layer of the power generating element 1 due to temperature changes.

[0110] The terminals may also contain non-flammable materials such as metals, ceramics, solid electrolytes, etc. When the terminals contain a non-flammable material, it also has the effect of acting as a layer wall that prevents the battery from spreading when it generates abnormal heat.

[0111] The terminal may also have a laminated structure of multiple conductive layers each made of a conductive material, and the conductive materials of the multiple conductive layers may be the same or different.

[0112] The electrode terminal 80 and the counter electrode terminal 90 may be made of the same material or different materials. When the electrode terminal 80 and the counter electrode terminal 90 are made of different materials, at least one of the electrode terminal 80 and the counter electrode terminal 90 may satisfy the material, physical properties, etc. of the terminals described above.

[0113] Furthermore, the thickness of the terminal is not particularly limited. From the viewpoint of the volumetric energy density of the battery 100, the thickness of the terminal, particularly the thickness of at least one of the electrode contact portion 82 and the counter electrode contact portion 92, may be thinner than the thickness of the current collector. The thickness of the terminal, particularly the thickness of the electrode contact portion 82 and the counter electrode contact portion 92, may each be, for example, 1 μm or more and 50 μm or less, or 2 μm or more and 40 μm or less. When the thickness of the terminal is within the above range, stress caused by expansion or contraction of the current collector due to temperature changes can be easily alleviated while suppressing a decrease in volumetric energy density, and the characteristics of the battery 100 can be stably obtained.

[0114] With the above configuration, a highly reliable battery 100 can be realized.

[0115] When the configuration of battery 100 according to this embodiment is compared with the configurations of the batteries described in Patent Documents 1 and 2, the following differences are found.

[0116] Patent Document 1 discloses an all-solid-state battery with a structure in which insulating material is used on the side walls of the power generating element and tab leads are used to maximize its performance. However, the current collector end faces are exposed between the insulating materials, and the processed surface of the current collector generally has a high activity with little oxide film after cutting. Therefore, when a terminal such as a tab lead is used to extract a terminal, contact with the lead terminal is likely to cause a short circuit. Furthermore, tab leads are prone to initiation of reaction product generation during exposure to trace amounts of gas and repeated charge / discharge cycles. Furthermore, burrs (dust) that fall off during tab lead processing can adhere to the current collector and cause a short circuit. Furthermore, the structure is prone to peeling from the exposed current collector end. Furthermore, because the tab lead is not integrally bonded to the side of the power generating element, it is prone to breakage when subjected to impacts and localized stress. As such, conventional configurations pose reliability issues. These problems become even more pronounced as batteries become smaller and more multilayered.

[0117] Furthermore, Patent Document 2 discloses a battery pack in which multiple batteries are connected with tab leads. However, the multiple batteries are connected with lead terminals such as tab leads. Furthermore, the battery has a structure in which each layer of the power generating element is exposed on the side walls. Therefore, like Patent Document 1, the battery in Patent Document 2 is prone to breakage, peeling of each layer from the exposed side wall edges, and short circuits. Furthermore, these problems become more pronounced as the battery becomes smaller and the number of connected batteries increases.

[0118] In contrast, in the configuration of the battery 100 including the insulating film according to the present embodiment, at least a portion of the side surfaces of the electrode layer 10 and the counter electrode layer 20 of the power generating element 1 are covered with the insulating film. This configuration reduces, for example, exposure of the current collectors of the electrode layer 10 and the counter electrode layer 20. Furthermore, the insulating film binds each layer of the power generating element 1 from the end of the power generating element 1, thereby suppressing peeling of each layer of the power generating element 1 and the falling off of burrs during processing. Furthermore, the insulating film improves electrical isolation between the two electrodes. These effects make it possible to realize a highly reliable battery 100 that suppresses short circuits between the electrode layer 10 and the counter electrode layer 20 even when miniaturized.

[0119] Furthermore, the battery 100 according to this embodiment has an integrated structure in which the insulating film covering the side surface of the power generating element 1 is covered from the outside by the terminals. Therefore, when an impact or local stress is applied to the terminals, the terminals are less likely to break, and the problems described above are less likely to occur. This makes it possible to realize a highly reliable battery 100. Furthermore, Patent Documents 1 and 2 do not disclose or suggest a battery having an insulating film and terminals as described in this embodiment, or a stacked battery in which batteries are stacked.

[0120] [Variation 1] The following describes Modification 1 of Embodiment 1. In the following description of Modification 1, differences from Embodiment 1 will be mainly described, and descriptions of commonalities will be omitted or simplified.

[0121] Figure 2 is a cross-sectional view and a top view showing a schematic configuration of a battery according to Modification 1 of Embodiment 1. Specifically, Figure 2(a) is a cross-sectional view of a battery 200 according to this modification, and Figure 2(b) is a plan view of the battery 200 as seen from above in the z-axis direction. Figure 2(a) shows a cross section taken along line IIa-IIa in Figure 2(b).

[0122] 2, the battery 200 according to the first modification of the first embodiment is different from the battery 100 according to the first embodiment mainly in that the power generating element 1a is not a single cell constituted by one battery cell 50, but is a battery in which a plurality of battery cells 50 are connected in series. Instead of the power generating element 1, electrode insulating film 60, counter electrode insulating film 70, electrode terminal 80, and counter electrode terminal 90 of the battery 100, the battery 200 includes a power generating element 1a, an electrode insulating film 60a, a counter electrode insulating film 70a, an electrode terminal 80a, and a counter electrode terminal 90a.

[0123] The power generating element 1a has a plurality of battery cells 50, specifically two battery cells 50. The number of battery cells 50 included in the power generating element 1a is not limited to two, and may be three or more. The power generating element 1a also has a conductive connection layer 40 between adjacent battery cells 50 among the plurality of battery cells 50.

[0124] The power-generating element 1a has an electrode principal surface 2a, which is a principal surface formed by the surface of the electrode layer 10 of the uppermost battery cell 50; a counter electrode principal surface 3a, which is a principal surface formed by the surface of the counter electrode layer 20 of the lowermost battery cell 50; and side surfaces. The electrode principal surface 2a has an electrode exposed region 4a that is not covered by the electrode insulating film 60a and the counter electrode insulating film 70a at a position overlapping a counter electrode principal surface covering portion 72, which will be described later, in a plan view. The counter electrode principal surface 3a has a counter electrode exposed region 5a that is not covered by the electrode insulating film 60a and the counter electrode insulating film 70a at a position overlapping an electrode principal surface covering portion 62a, which will be described later, in a plan view. The side surfaces include a first side surface 6a and a second side surface 7a, which are both side surfaces on the shorter sides of the power-generating element 1a in a plan view.

[0125] The plurality of battery cells 50 are electrically connected in series and stacked. The plurality of battery cells 50 are stacked such that the electrode layer 10 of one of the plurality of adjacent battery cells 50 and the counter electrode layer 20 of the other are adjacent to each other via the connection layer 40, without the solid electrolyte layer 30 sandwiched therebetween. In other words, the plurality of battery cells 50 are stacked such that the electrode layer 10 and the counter electrode layer 20 of each battery cell 50 are in the same up-down position. In this modification, the electrode layer 10 (specifically, the electrode current collector 11) of one of the adjacent battery cells 50 and the counter electrode layer 20 (specifically, the counter electrode current collector 21) are electrically connected by the connection layer 40, thereby stacking the plurality of battery cells 50 in an electrically connected series manner. In other words, the power generating element 1a has a bipolar electrode in which the electrode layer 10 and the counter electrode layer 20 are connected without the solid electrolyte layer 30 interposed therebetween.

[0126] The power-generating element 1a may not include the connection layer 40, and the plurality of battery cells 50 may be stacked such that one electrode layer 10 and the other counter electrode layer 20 of adjacent battery cells 50 are adjacent to each other without the connection layer 40 interposed therebetween. For example, the plurality of battery cells 50 may be stacked while electrically connected in series such that one electrode layer 10 and the other counter electrode layer 20 of adjacent battery cells 50 are in direct contact with each other and electrically connected to each other.

[0127] The connection layer 40 is made of, for example, a conductive material having electronic conductivity. The conductive material that constitutes the connection layer 40 is not particularly limited, but the conductive materials exemplified above as the conductive material that constitutes the terminals can be used as the conductive material.

[0128] The electrode insulating film 60a and the counter electrode insulating film 70a respectively cover the first side surface 6a and the second side surface 7a, which are both side surfaces on the shorter sides of the power generating element 1a in a plan view. The electrode terminal 80a and the counter electrode terminal 90a are in contact with the electrode insulating film 60a and the counter electrode insulating film 70a, respectively. The electrode terminal 80a and the counter electrode terminal 90a are arranged opposite each other.

[0129] The electrode insulating film 60a has a first side surface covering portion 61a that covers a portion of the side surface of the power generating element 1a and an electrode main surface covering portion 62a that covers the electrode main surface 2a. In this embodiment, the electrode insulating film 60a does not cover the counter electrode main surface 3a. The electrode insulating film 60a may cover a portion of the counter electrode main surface 3a.

[0130] The first side surface covering portion 61a continuously covers, for example, the first side surface 6a from the end on the electrode principal surface 2a side to the end on the counter electrode principal surface 3a side. In other words, the first side surface covering portion 61a continuously covers the side surfaces of the multiple battery cells 50 and the connection layer 40 in the power generating element 1a.

[0131] The counter electrode insulating film 70a has a second side surface covering portion 71a that covers another portion of the side surface of the power generating element 1a, and a counter electrode main surface covering portion 72a that covers the counter electrode main surface 3a. In this embodiment, the counter electrode insulating film 70a does not cover the electrode main surface 2a. The counter electrode insulating film 70a may cover a portion of the electrode main surface 2a.

[0132] The second side surface covering portion 71a continuously covers, for example, the second side surface 7a from the end on the electrode principal surface 2a side to the end on the counter electrode principal surface 3a side. In other words, the second side surface covering portion 71a continuously covers the side surfaces of the multiple battery cells 50 and the connection layer 40 in the power generating element 1a.

[0133] The electrode terminal 80a is a film-like member that covers the counter electrode insulating film 70a from the outside and is electrically connected to the uppermost electrode layer 10 in the power generating element 1a. In detail, the electrode terminal 80a extends from the outer surface of the counter electrode insulating film 70a around to the electrode main surface 2a, which is the main surface of the electrode current collector 11 that is the uppermost electrode in the power generating element 1a, and continuously covers the counter electrode insulating film 70a and at least a portion of the electrode main surface 2a. The electrode terminal 80a has a counter electrode insulating film covering portion 81a that covers the counter electrode insulating film 70a and an electrode contact portion 82a that contacts the electrode main surface 2a.

[0134] The counter electrode terminal 90a is a film-like member that covers the electrode insulating film 60a from the outside and is electrically connected to the counter electrode layer 20 located at the lowest position in the power generating element 1a. In detail, the counter electrode terminal 90a extends from the outer surface of the electrode insulating film 60a around to the counter electrode main surface 3a, which is the main surface of the counter electrode current collector 21 located at the lowest position in the power generating element 1a, and continuously covers at least a portion of the electrode insulating film 60a and the counter electrode main surface 3a. The counter electrode terminal 90a has an electrode insulating film covering portion 91a that covers the electrode insulating film 60a and a counter electrode contact portion 92a that contacts the counter electrode main surface 3a.

[0135] The structure that integrates the insulating film, the terminals, and the power generating element 1a in which the multiple battery cells 50 are electrically connected in series makes it possible to generate a high voltage and suppress short circuits and peeling of the layers of the power generating element 1a, thereby realizing a high-energy, highly reliable battery 200.

[0136] In the battery 200, the insulating film may have a laminated structure of multiple insulating layers. Fig. 3 is a cross-sectional view showing a schematic configuration of another battery according to Modification 1 of Embodiment 1. As shown in Fig. 3, the battery 200a includes an electrode insulating film 60b and a counter electrode insulating film 70b having a laminated structure of multiple insulating layers, instead of the electrode insulating film 60a and the counter electrode insulating film 70a of the battery 200.

[0137] The electrode insulating film 60b has a first side surface covering portion 61b that covers a portion of the side surface of the power-generating element 1a and an electrode main surface covering portion 62b that covers the electrode main surface 2a. The electrode insulating film 60b also has a layered structure of multiple insulating layers 65b and 66b. In FIG. 3, the layered structure of multiple insulating layers 65b and 66b is provided across the entire region of the electrode insulating film 60b, but the layered structure of multiple insulating layers 65b and 66b may be provided only in part of the electrode insulating film 60b. For example, only one of the first side surface covering portion 61b and the electrode main surface covering portion 62b may have the layered structure of multiple insulating layers 65b and 66b.

[0138] The counter electrode insulating film 70b has a second side surface covering portion 71b covering the second side surface 7a and a counter electrode main surface covering portion 72b covering the counter electrode main surface 3a. The counter electrode insulating film 70b has a layered structure of multiple insulating layers 75b and 76b. In FIG. 3, the layered structure of multiple insulating layers 75b and 76b is provided over the entire region of the counter electrode insulating film 70b, but the layered structure of multiple insulating layers 75b and 76b may be provided only in part of the counter electrode insulating film 70b. For example, only one of the second side surface covering portion 71b and the counter electrode main surface covering portion 72b may have the layered structure of multiple insulating layers 75b and 76b.

[0139] Hereinafter, the plurality of insulating layers 65b and 66b and the plurality of insulating layers 75b and 76b may be collectively referred to simply as "insulating layers."

[0140] 3, the number of insulating layers included in the electrode insulating film 60b and the counter electrode insulating film 70b is two each, but may be three or more each. Note that one of the electrode insulating film 60b and the counter electrode insulating film 70b does not have to have a stacked structure of multiple insulating layers.

[0141] The thickness of each of the insulating layers is, for example, 30 μm or less. From the viewpoint of forming denser electrode insulating film 60b and counter electrode insulating film 70b, the thickness of each of the insulating layers may be 10 μm or less.

[0142] The electrode insulating film 60b and the counter electrode insulating film 70b are formed by applying and curing an insulating resin, such as an epoxy resin, multiple times. For example, by applying and curing an additional epoxy resin on top of a cured epoxy resin, defects such as voids and thin areas due to thickness variations can be reduced, resulting in a dense and strong insulating film. Forming terminals on an insulating film with reduced defects reduces the risk of conductive material penetrating the insulating film and causing short circuits. Furthermore, if a thick insulating film is formed by applying and curing an insulating resin all at once, it may peel off due to stress during curing. In particular, if there are bent portions between the first side surface covering portion 61b and the electrode principal surface covering portion 62b and between the second side surface covering portion 71b and the counter electrode principal surface covering portion 72b, contraction stress during resin curing acts on the end opposite the bent portion, easily leading to peeling from the end. Therefore, if a thin insulating film is applied and cured multiple times to form a laminate, even if the insulating film is formed to a thickness of, for example, 100 μm, strong curing stress is unlikely to act, and peeling is suppressed. This makes it possible to form an insulating film with a laminated structure of multiple insulating layers while suppressing cracking and peeling. Of course, it is also possible to form an insulating film with a thickness of 1 mm. Such a laminated structure of multiple insulating layers can be observed as a laminated structure that has been repeatedly applied and cured multiple times through general observation of a polished cross section using an optical microscope or SEM (Scanning Electron Microscope).

[0143] The insulating layers constituting the multiple insulating layers may be composed of the same material or different materials. In other words, when forming insulating layers multiple times, different insulating materials may be used for each layer. For example, by repeatedly applying and curing insulating resins so that the curing temperature, melting point, or glass transition point of the insulating resins changes from high to low, a dense and thick insulating film can be formed without deteriorating the properties of the previously formed insulating layer due to the heat during curing. In this case, the outermost insulating layer has a higher curing temperature, melting point, or glass transition point of the resin contained therein. The thermal curing conditions may be set to a temperature and time within a range that does not adversely affect the battery characteristics.

[0144] [Variation 2] Next, a description will be given of Modification 2 of Embodiment 1. In the following description of Modification 2, differences from Embodiment 1 will be mainly described, and descriptions of commonalities will be omitted or simplified.

[0145] Fig. 4A is a top view showing a schematic configuration of a battery according to Modification 2 of Embodiment 1. Fig. 4B is a bottom view showing a schematic configuration of a battery according to Modification 2 of Embodiment 1. Fig. 4A is a plan view of battery 300 according to this modification when viewed from above in the z-axis direction, and Fig. 4B is a plan view of battery 300 when viewed from below in the z-axis direction.

[0146] 4A and 4B, the battery 300 according to the second modification of the first embodiment is different from the battery 100 according to the first embodiment mainly in that the insulating film and the terminal cover one of the long sides of the side surfaces of the power generating element 1 in a plan view. The battery 300 includes an electrode insulating film 60c, a counter electrode insulating film 70c, an electrode terminal 80c, and a counter electrode terminal 90c, instead of the electrode insulating film 60, counter electrode insulating film 70, electrode terminal 80, and counter electrode terminal 90 of the battery 100.

[0147] The electrode insulating film 60c has a first side surface covering portion 61c that covers a part of the side surface of the power generating element 1, and an electrode main surface covering portion 62c that covers the electrode main surface 2. The counter electrode insulating film 70c has a second side surface covering portion 71c that covers another part of the side surface of the power generating element 1, and a counter electrode main surface covering portion 72c that covers the counter electrode main surface 3.

[0148] The first side surface covering portion 61c and the second side surface covering portion 71c both cover the third side surface 8, which is the longer side surface in a plan view of the side surfaces of the power generating element 1. The first side surface covering portion 61c and the second side surface covering portion 71c are in contact with and joined to the third side surface 8, for example. In addition, the electrode insulating film 60c and the counter electrode insulating film 70c are spaced apart from each other.

[0149] The first side surface covering portion 61c also extends onto the counter electrode principal surface 3, covering a portion of the counter electrode principal surface 3. The second side surface covering portion 71c also extends onto the electrode principal surface 2, covering a portion of the electrode principal surface 2. In this way, the first side surface covering portion 61c and the second side surface covering portion 71c extend up to the principal surfaces of the power generating element 1, so that the power generating element 1 can be sandwiched from both principal surfaces by the insulating films, which further prevents the layers of the power generating element 1 from peeling off and burrs from falling off during processing.

[0150] The electrode terminal 80c has a counter electrode insulating film covering portion 81c that covers the counter electrode insulating film 70c, and an electrode contact portion 82c that contacts the electrode main surface 2. The counter electrode terminal 90c has an electrode insulating film covering portion 91c that covers the electrode insulating film 60c, and a counter electrode contact portion 92c that contacts the counter electrode main surface 3. Both the electrode terminal 80c and the counter electrode terminal 90c cover the third side surface 8 via an insulating film.

[0151] In plan view, the electrode contact portion 82c of the electrode terminal 80c contacts the electrode main surface 2 on the inside of the inner end portion of the second side surface covering portion 71c that wraps around to the electrode main surface 2, and the counter electrode contact portion 92c of the counter electrode terminal 90c contacts the counter electrode main surface 3 on the inside of the inner end portion of the first side surface covering portion 61c that wraps around to the electrode main surface 2.

[0152] As described above, by configuring the electrode insulating film 60c and the counter electrode insulating film 70c covered by the terminal to cover the same third side surface 8, it is possible to realize a battery 300 that is compatible with a small installation form in which current is drawn from only one of the long sides of the power generating element 1 in a planar view.

[0153] In the battery 300, the electrode insulating film 60c and the counter electrode insulating film 70c are spaced apart, but this is not limited thereto. The electrode insulating film 60c and the counter electrode insulating film 70c may be in contact with each other. FIG. 5 is a top view showing a schematic configuration of another battery according to Modification 2 of Embodiment 1. As shown in FIG. 5, in the battery 300a, the electrode insulating film 60c and the counter electrode insulating film 70c are in contact with each other between the electrode terminal 80c and the counter electrode terminal 90c in plan view. This improves the insulation between the electrode terminal 80c and the counter electrode terminal 90c, and can suppress short-circuiting between the two terminals and between the terminal and the power generating element 1.

[0154] [Variation 3] Next, a description will be given of Modification 3 of Embodiment 1. In the following description of Modification 3, differences from Embodiment 1 will be mainly described, and descriptions of commonalities will be omitted or simplified.

[0155] Fig. 6A is a top view showing a schematic configuration of a battery according to Modification 3 of Embodiment 1. Fig. 6B is a bottom view showing a schematic configuration of a battery according to Modification 3 of Embodiment 1. Fig. 6A is a plan view of battery 400 according to this modification when viewed from above in the z-axis direction, and Fig. 6B is a plan view of battery 400 when viewed from below in the z-axis direction.

[0156] 6A and 6B, the battery 400 according to the third modification of the first embodiment is different from the battery 100 according to the first embodiment mainly in that the insulating film and the terminal cover one of the short sides of the side surfaces of the power generating element 1 in a plan view. The battery 400 includes an electrode insulating film 60d, a counter electrode insulating film 70d, an electrode terminal 80d, and a counter electrode terminal 90d, instead of the electrode insulating film 60, the counter electrode insulating film 70, the electrode terminal 80, and the counter electrode terminal 90 of the battery 100.

[0157] The electrode insulating film 60d has a first side surface covering portion 61d that covers a part of the side surface of the power generating element 1, and an electrode main surface covering portion 62d that covers the electrode main surface 2. The counter electrode insulating film 70d has a second side surface covering portion 71d that covers another part of the side surface of the power generating element 1, and a counter electrode main surface covering portion 72d that covers the counter electrode main surface 3.

[0158] The first side surface covering portion 61d and the second side surface covering portion 71d both cover the second side surface 7, which is the surface on the shorter side in a plan view of the side surfaces of the power generating element 1. The first side surface covering portion 61d and the second side surface covering portion 71d are in contact with and joined to the second side surface 7, for example. In addition, the electrode insulating film 60d and the counter electrode insulating film 70d are spaced apart from each other.

[0159] The electrode terminal 80d has a counter electrode insulating film covering portion 81d that covers the counter electrode insulating film 70d, and an electrode contact portion 82d that contacts the electrode main surface 2. The counter electrode terminal 90d has an electrode insulating film covering portion 91d that covers the electrode insulating film 60d, and a counter electrode contact portion 92d that contacts the counter electrode main surface 3. Both the electrode terminal 80d and the counter electrode terminal 90d cover the second side surface 7 via an insulating film.

[0160] As described above, by configuring the electrode insulating film 60d and the counter electrode insulating film 70d covered by the terminal to cover the same second side surface 7, it is possible to realize a battery 400 that is compatible with a small installation form in which current is drawn from only one of the short sides of the power generating element 1 in a planar view.

[0161] In the battery 400, the electrode insulating film 60d and the counter electrode insulating film 70d are spaced apart, but this is not limited thereto. The electrode insulating film 60d and the counter electrode insulating film 70d may be in contact with each other. FIG. 7 is a top view showing a schematic configuration of another battery according to Modification 3 of Embodiment 1. As shown in FIG. 7, in the battery 400a, the electrode insulating film 60d and the counter electrode insulating film 70d are in contact with each other between the electrode terminal 80d and the counter electrode terminal 90d in plan view. This improves the insulation between the electrode terminal 80d and the counter electrode terminal 90d, and can suppress short-circuiting between the two terminals and between the terminal and the power-generating element 1.

[0162] [Battery manufacturing method] Next, an example of a method for manufacturing the battery according to the present embodiment will be described. Below, a method for manufacturing the battery 200a described in Modification 1 of Embodiment 1 above will be described. In addition, in the following description of the manufacturing method, the electrode layer 10 is a positive electrode layer having an electrode active material layer 12 and a positive electrode active material layer and a positive electrode current collector as the electrode current collector 11, and the counter electrode layer 20 is a negative electrode layer having a counter electrode active material layer 22 and a negative electrode active material layer and a negative electrode current collector as the counter electrode current collector 21.

[0163] First, pastes to be used for printing the positive electrode active material layer and the negative electrode active material layer are prepared. As the solid electrolyte raw material used for the mixture of the positive electrode active material layer and the negative electrode active material layer, for example, a glass powder of Li2S-P2S5-based sulfide having an average particle size of about 10 μm and mainly composed of triclinic crystals is prepared. This glass powder may have a particle size of, for example, 2 to 3 × 10 -3 A glass powder having a high ionic conductivity of about 1000 s / cm can be used as the positive electrode active material. For example, a Li·Ni·Co·Al composite oxide (LiNi 0.8 Co 0.15 Al 0.05 A powder of O2) is used. A paste for a positive electrode active material layer is prepared by dispersing a mixture containing the above-mentioned positive electrode active material and the above-mentioned glass powder in an organic solvent or the like. In addition, as the negative electrode active material, for example, a powder of natural graphite having an average particle size of about 10 μm is used. Similarly, a paste for a negative electrode active material layer is prepared by dispersing a mixture containing the above-mentioned negative electrode active material and the above-mentioned glass powder in an organic solvent or the like.

[0164] Next, copper foil with a thickness of, for example, approximately 30 μm is prepared as the material to be used as the positive electrode current collector and the negative electrode current collector. A paste for a positive electrode active material layer and a paste for a negative electrode active material layer are printed on one surface of each copper foil by screen printing, each in a predetermined shape and with a thickness of 50 μm to 100 μm. The paste for a positive electrode active material layer and the paste for a negative electrode active material layer are dried, for example, at 80°C to 130°C, to a thickness of 30 μm to 60 μm. This results in current collectors (copper foils) on which the positive electrode active material layer and the negative electrode active material layer are formed, i.e., the positive electrode layer and the negative electrode layer (i.e., the electrode layer 10 and the counter electrode layer 20), respectively.

[0165] Next, a paste for a solid electrolyte layer is prepared by dispersing the mixture containing the glass powder in an organic solvent or the like. The paste for a solid electrolyte layer is printed on the surfaces of the active material layers of the positive electrode layer and the negative electrode layer using a metal mask, for example, to a thickness of about 100 μm. Thereafter, the positive electrode layer and the negative electrode layer on which the paste for a solid electrolyte layer is printed are dried at a temperature of 80° C. or higher and 130° C. or lower.

[0166] Next, the solid electrolyte printed on the positive electrode active material layer of the positive electrode layer and the solid electrolyte printed on the negative electrode active material layer of the negative electrode layer are laminated so as to be in contact with and face each other.

[0167] Next, the laminated body is pressed with a pressing mold. Specifically, a 70 μm thick, 5×10 elastic modulus, or the like, is placed between the laminate and a pressing mold plate, i.e., on the top surface of the current collector. 6 An elastic sheet of about 300 MPa is inserted. With this configuration, pressure is applied to the laminate via the elastic sheet. After that, for example, the pressure mold is pressed at a pressure of 300 MPa for 90 seconds while being heated to 50°C. This results in a battery cell 50. The same number of battery cells 50 fabricated in this way as the number to be included in the power generating element 1a are prepared.

[0168] Next, a thermosetting conductive paste containing silver particles with an average particle size of 0.5 μm is applied by screen printing to a thickness of approximately 5 μm as the connection layer 40 onto one of the current collectors of the positive electrode layer and the negative electrode layer of the battery cell 50. The battery cell 50 and another battery cell 50 are then stacked so as to be connected in series via the applied conductive paste. In other words, the battery cell 50 and another battery cell 50 are stacked so that the current collector that serves as the counter electrode of the current collector to which the conductive paste is applied is placed on the applied conductive paste, and the battery cell 50 and another battery cell 50 are pressure-bonded together. To increase the number of series connections, this process is repeated for the number of battery cells to be multi-layered. After this, the battery cell 50 and another battery cell 50 are pressed together at a pressure of, for example, approximately 1 kg / cm. 2 While the electrode is held immobile under the applied pressure, it is subjected to a heat curing treatment at 100°C to 130°C for 40 minutes to 100 minutes, and then cooled to room temperature, thereby obtaining the power generating element 1a.

[0169] Next, a thermosetting epoxy resin is applied by screen printing to a thickness of approximately 20 μm to 40 μm to form the first side surface covering portion 61b and the second side surface covering portion 71b on the first side surface 6a and the second side surface 7a, which are the short side surfaces of the power generating element 1a in a plan view. The thermosetting epoxy resin is also applied to the portions of the long side surfaces of the power generating element 1a. The applied thermosetting epoxy resin is then cured at a temperature of 120°C to 150°C for 1 hour to 3 hours. Next, a thermosetting epoxy resin is applied by screen printing to a thickness of 10 μm to 40 μm to form the electrode main surface covering portion 62b and the counter electrode main surface covering portion 72b on portions of the electrode main surface 2a and the counter electrode main surface 3a. The applied thermosetting epoxy resin is then cured at a temperature of 120°C to 150°C for 1 hour to 3 hours. These coating and curing steps are repeated the number of times corresponding to the number of insulating layers, to form a laminate of insulating films, for example, having a thickness of 20 μm or more and 120 μm or less.

[0170] Next, a thermosetting conductive paste containing silver particles with an average particle size of 0.5 μm is screen-printed to a thickness of approximately 30 μm on a portion of the electrode principal surface 2 and the counter electrode principal surface 3 to form a pattern. Next, the thermosetting conductive paste containing silver particles is applied by printing onto the surface of the insulating film. The power generating element 1a to which the conductive paste has been applied is then cured at a temperature equal to or lower than the curing temperature used to form the insulating film, for example, at a temperature of 100°C to 130°C for 0.5 hours to 3 hours, thereby forming a terminal. If necessary, the terminal may be formed by laminating the same material as the insulating film so that the terminal has the desired thickness.

[0171] In this way, the battery 200a is obtained. The same conductive paste may be used for the connection layer 40 and the terminals, or different conductive pastes with different curing temperatures or conductive particles may be used. For example, when a thin coating film is to be formed, finer conductive particles such as silver particles or scale-like particles may be used as the conductive particles. Furthermore, a material containing a low-melting point metal may be used for the connection layer 40 or the terminals, with the aim of forming an alloy between the connection layer 40 or the terminals and the current collector due to the heat generated during curing.

[0172] The battery manufacturing method and the order of the steps described above are not limited to the above example. For example, the battery 200a may be manufactured by forming an insulating film and terminals on each of the multiple battery cells 50, and then stacking the multiple battery cells with the insulating film and terminals formed thereon.

[0173] In the above-described manufacturing method, the positive electrode active material layer paste, the negative electrode active material layer paste, the solid electrolyte layer paste, and the conductive paste are applied by printing, but the present invention is not limited to this. Examples of printing methods that may be used include doctor blade printing, calendar printing, spin coating, dip coating, inkjet printing, offset printing, die coating, and spray printing.

[0174] Furthermore, the first side surface covering portion 61b and the electrode principal surface covering portion 62b, and the second side surface covering portion 71b and the counter electrode principal surface covering portion 72b may be formed by applying a thermosetting epoxy resin or the like all at once.

[0175] Alternatively, the insulating film may be formed by immersing the side surface of the power generating element 1a in a liquid thermosetting resin, covering the side surface of the power generating element 1a with the liquid thermosetting resin, and then thermally curing the resin.

[0176] In the above-described manufacturing method, a thermosetting conductive paste containing silver metal particles is used as an example of the conductive paste, but this is not limiting. The conductive paste may be a thermosetting conductive paste containing highly conductive metal particles with a high melting point (e.g., 400°C or higher), low melting point metal particles (preferably below the hardening temperature of the conductive paste, e.g., 300°C or lower), and a resin. Examples of materials for the high-melting-point highly conductive metal particles include silver, copper, nickel, zinc, aluminum, palladium, gold, platinum, and alloys of these metals. Examples of materials for the low-melting-point metal particles with a melting point of 300°C or lower include tin, tin-zinc alloy, tin-silver alloy, tin-copper alloy, tin-aluminum alloy, tin-lead alloy, indium, indium-silver alloy, indium-zinc alloy, indium-tin alloy, bismuth, bismuth-silver alloy, bismuth-nickel alloy, bismuth-tin alloy, bismuth-zinc alloy, and bismuth-lead alloy. By using a conductive paste containing such low-melting-point metal particles, solid-phase and liquid-phase reactions proceed at the contact points between the metal particles in the conductive paste and the metal constituting the current collector, even at curing temperatures lower than the melting point of the high-melting-point, highly conductive metal particles. As a result, a diffusion region formed by solid-phase and liquid-phase reactions is formed around the contact points at the interface between the conductive paste and the surface of the current collector. Examples of the alloy formed include a highly conductive silver-copper alloy when silver or a silver alloy is used for the conductive metal particles and copper is used for the current collector. Furthermore, a silver-nickel alloy or a silver-palladium alloy can also be formed by combining the conductive metal particles with the current collector. This configuration provides a stronger bond between the conductive paste and the current collector, thereby preventing the bonded portion between the conductive paste and the current collector from peeling due to, for example, thermal cycling or impact.

[0177] The shapes of the high-melting-point highly conductive metal particles and the low-melting-point metal particles may be any shape, such as spherical, scaly, or needle-like. The particle sizes of the high-melting-point highly conductive metal particles and the low-melting-point metal particles are not particularly limited. For example, the smaller the particle size, the more the alloy reaction and diffusion proceed at low temperatures. Therefore, the particle size and shape are appropriately selected taking into account the process design and the influence of thermal history on battery characteristics.

[0178] The resin used in the thermosetting conductive paste may be any resin that functions as a binder for bonding, and may be selected appropriately depending on the manufacturing process to be employed, such as printability and applicability. Examples of resins used in the thermosetting conductive paste include thermosetting resins. Examples of thermosetting resins include the thermosetting resins exemplified above as materials for the terminals. Only one of these materials may be used as the thermosetting resin, or two or more of these materials may be used in combination.

[0179] The batteries 100, 200, 300, 300a, 400, and 400a can also be formed by applying the same method as above depending on the shape and number of components of each battery.

[0180] (Embodiment 2) Next, a second embodiment will be described. In the second embodiment, a stacked battery in which batteries according to the present disclosure are stacked will be described. In the following description of the second embodiment, differences from the first embodiment and the modifications of the first embodiment will be mainly described, and descriptions of commonalities between the first embodiment and the second embodiment will be omitted or simplified.

[0181] Fig. 8 is a cross-sectional view and a top view showing a schematic configuration of a stacked battery according to embodiment 2. Specifically, Fig. 8(a) is a cross-sectional view of a stacked battery 1000 according to this embodiment, and Fig. 8(b) is a plan view of the stacked battery 1000 as seen from above in the z-axis direction. Fig. 8(a) shows a cross section taken along line VIIIa-VIIIa in Fig. 8(b).

[0182] As shown in FIG. 8, the stacked battery 1000 according to the second embodiment includes a plurality of batteries 500 each including a power generating element 1 similar to that of the battery 100 according to the first embodiment. The number of batteries 500 included in the stacked battery 1000 is two in the example shown in FIG. 8, but may be three or more. The stacked battery 1000 also includes a connection layer 41 between adjacent batteries 500 among the plurality of batteries 500. The stacked battery 1000 does not necessarily need to include the connection layer 41. In this case, for example, a gap may be formed between adjacent batteries 500.

[0183] Each of the plurality of batteries 500 includes a power generating element 1, an electrode insulating film 60, a counter electrode insulating film 70e, an electrode terminal 80e, and a counter electrode terminal 90e. The plurality of batteries 500 are electrically connected in parallel and stacked. Specifically, the electrode terminals 80e and the counter electrode terminals 90e of the plurality of batteries 500 are in contact with each other and electrically connected, thereby electrically connecting the plurality of batteries 500 in parallel.

[0184] The plurality of batteries 500 are stacked such that the counter electrode principal surfaces 3 of adjacent batteries 500 are adjacent to each other with the connection layer 41 interposed therebetween, without the power-generating element 1 sandwiched between them. In other words, the adjacent batteries 500 are stacked such that the electrode principal surface 2 and the counter electrode principal surface 3 of each battery 500 are inverted in up-down relationship. The plurality of batteries 500 may also be stacked such that the counter electrode principal surfaces 3 of adjacent batteries 500 are adjacent to each other with the connection layer 41 interposed therebetween.

[0185] The connection layer 41 is made of, for example, a conductive material having electronic conductivity. This electrically connects current collectors of the same polarity, making it easier to extract current from the power generating element 1. The conductive material that makes up the connection layer 41 is not particularly limited, but the conductive materials exemplified in the description of the terminals above can be used as the conductive material. The connection layer 41 may also be an electrical insulator. The connection layer 41 may also be made of, for example, a resin or the like exemplified in the description of the insulating film above.

[0186] The counter electrode insulating film 70e has a second side surface covering portion 71e that covers the second side surface 7 and a counter electrode main surface covering portion 72e that covers the counter electrode main surface 3. The counter electrode main surface covering portion 72e is located between adjacent batteries 500. The two counter electrode insulating films 70e provided on each of the adjacent batteries 500 are continuous and connected. This allows the adjacent batteries 500 to be covered by the connected insulating film, thereby stabilizing the stacked structure of the stacked battery 1000. Note that when adjacent batteries 500 are stacked so that the electrode main surfaces 2 of the adjacent batteries 500 are adjacent to each other, the two electrode insulating films 60 provided on each of the adjacent batteries 500 may be connected.

[0187] The electrode terminal 80e has a counter electrode insulating film covering portion 81e that covers the counter electrode insulating film 70e, and an electrode contact portion 82e that contacts the electrode main surface 2. The two electrode terminals 80e provided on each of the adjacent batteries 500 are continuous and connected.

[0188] The counter electrode terminal 90e has an electrode insulating film covering portion 91e that covers the electrode insulating film 60, and a counter electrode contact portion 92e that contacts the counter electrode main surface 3. The two counter electrode terminals 90e provided on each of adjacent batteries 500 are continuous and connected. The counter electrode contact portion 92e is located between the adjacent batteries 500.

[0189] Adjacent batteries 500 are covered and electrically connected by the electrode terminal 80e and counter electrode terminal 90e, and this stabilizes the stacked structure of the battery stack 1000 and current extraction.

[0190] The stacked battery 1000 can be manufactured, for example, by producing a plurality of power generating elements 1 each made up of battery cells 50 using a method similar to the manufacturing method of the battery 200a described above, stacking the plurality of power generating elements 1 so that they can be connected in parallel, and collectively forming insulating films and terminals on the plurality of power generating elements 1. Alternatively, the stacked battery 1000 may be manufactured by forming insulating films and terminals individually on each of the plurality of power generating elements 1 to form a plurality of batteries 500, and then stacking the plurality of batteries 500.

[0191] The stacked battery 1000 can be constructed by connecting multiple identical cells 500 in parallel, which allows for excellent production control and mass production. The structure in which the cells 500 are connected together using insulating films and terminals allows for a highly reliable and large-capacity stacked battery 1000 to be realized.

[0192] [Variation 1] The following describes Modification 1 of Embodiment 2. In the following description of Modification 1, differences from Embodiment 1, each modification of Embodiment 1, and Embodiment 2 will be mainly described, and descriptions of commonalities will be omitted or simplified.

[0193] Fig. 9 is a cross-sectional view showing a schematic configuration of a stacked battery according to Variation 1 of Embodiment 2. As shown in Fig. 9, a stacked battery 2000 according to Variation 1 of Embodiment 2 includes a plurality of the batteries 200 according to Variation 1 of Embodiment 1. Note that the thicknesses of the electrode insulating film 60a, counter electrode insulating film 70a, electrode terminal 80a, and counter electrode terminal 90a of the batteries 200 included in the stacked battery 2000 are adjusted from those of the battery 200 shown in Fig. 2 so that the thickness of the stacked battery 2000 is uniform when stacked. Note that the thicknesses do not have to be adjusted.

[0194] The number of batteries 200 included in the stacked battery 2000 is three in the example shown in Fig. 9, but may be two, four, or more. The stacked battery 2000 also includes a connection layer 42 between adjacent batteries 200 among the plurality of batteries 200. The stacked battery 2000 does not necessarily have to include the connection layer 42. In this case, for example, a gap may be formed between adjacent batteries 200.

[0195] The plurality of batteries 200 are electrically connected in parallel and stacked. Specifically, the electrode terminals 80a and counter terminals 90a of adjacent batteries 200 are in contact with each other and electrically connected to each other, thereby electrically connecting the plurality of batteries 200. In the battery 200, the counter electrode insulating film coating portion 81a of the electrode terminal 80a covers the counter electrode main surface coating portion 72a, and the electrode insulating film coating portion 91a of the counter electrode terminal 90a covers the electrode main surface coating portion 62a, so that the top and bottom ends of the power-generating element 1a are also covered with terminals. Therefore, simply by stacking the plurality of batteries 200, the electrode terminals 80a and counter electrode terminals 90a of adjacent batteries 200 are in contact with each other, so that the plurality of batteries 200 can be easily electrically connected in parallel.

[0196] The plurality of batteries 200 are stacked such that the electrode principal surfaces 2a or the counter electrode principal surfaces 3 of adjacent batteries 200 are adjacent to each other with the connection layer 42 interposed therebetween, without any power-generating element 1a sandwiched between them. In other words, the adjacent batteries 200 are stacked such that the electrode principal surfaces 2a and the counter electrode principal surfaces 3a of each battery 200 are inverted in up-down relationship. By stacking the plurality of batteries 200 in this manner, even if the electrode principal surfaces 2a or the counter electrode principal surfaces 3 of adjacent batteries 200 come into contact with each other, no short circuit occurs, thereby improving reliability.

[0197] Note that, as long as the plurality of batteries 200 are stacked such that the electrode terminals 80a and counter electrode terminals 90a of adjacent batteries 200 are in contact with each other, the batteries 200 may be stacked such that one electrode principal surface 2a and the other counter electrode principal surface 3 of adjacent batteries 200 are adjacent to each other. In other words, as long as the electrode terminals 80a and counter electrode terminals 90a of adjacent batteries 200 are in contact with each other, the plurality of batteries 200 can be electrically connected in parallel even when stacked without regard to the up-down relationship between the electrode principal surface 2a and the counter electrode principal surface 3a.

[0198] The connection layer 42 is, for example, an electrical insulator. The connection layer 42 is made of, for example, the resin exemplified in the description of the insulating film above. The connection layer 42 may also be made of a conductive material having electronic conductivity. In this case, to prevent a short circuit, an insulating member is disposed or a gap is provided to insulate the terminals of opposite polarities from each other so that they are not electrically connected to each other.

[0199] The stacked battery 2000 can be formed, for example, by applying the material of the connection layer 42 to the battery 200 as needed, and then stacking the batteries 200 so that the electrode principal surfaces 2a or counter electrode principal surfaces 3 of adjacent batteries 200 are adjacent to each other.

[0200] Furthermore, by forming the patterns of the electrode principal surface covering portion 62a and the counter electrode principal surface covering portion 72a formed on the electrode principal surface 2a and the counter electrode principal surface 3a so as to also be used for alignment of positional references when stacking the batteries 200, there is no need to provide alignment marks.

[0201] As described above, the stacked battery 2000 has a structure in which a plurality of batteries 200 are electrically connected in parallel and stacked, thereby realizing a highly reliable and large-capacity stacked battery 2000. Furthermore, stacking a plurality of identical batteries 200 makes it possible to realize a highly reliable and large-capacity stacked battery 2000 that is suitable for mass production.

[0202] Note that multiple batteries 200 may be electrically connected in series to realize a highly reliable and high-energy stacked battery.

[0203] (Other embodiments) While the battery and stacked battery according to the present disclosure have been described above based on embodiments and modifications, the present disclosure is not limited to these embodiments and modifications. As long as they do not deviate from the gist of the present disclosure, various modifications that would occur to a person skilled in the art and other forms constructed by combining some of the components of the embodiments are also included within the scope of the present disclosure.

[0204] For example, in the above-described embodiments and modifications, the electrode principal surface and the counter electrode principal surface have an electrode exposed region and a counter electrode exposed region, respectively. At least one of the electrode insulating film and the counter electrode insulating film may cover both the electrode principal surface and the counter electrode principal surface, and the regions covered by the insulating film on each of the electrode principal surface and the counter electrode principal surface may be in the same position and size in a plan view. In this case, for example, an insulating film having such a structure can be formed simply by immersing the side surface of the power generating element in a coating solution of the insulating film material to the desired depth of coverage, thereby facilitating the manufacture of a battery.

[0205] Furthermore, for example, in the above-described embodiment and modified examples, the battery includes an electrode terminal and a counter terminal, but this is not limiting. The battery does not necessarily have to include an electrode terminal and a counter terminal, and the electrode terminal and the counter terminal may be provided when the battery is mounted in an electronic device, an automobile, or the like.

[0206] Furthermore, the above-described embodiments and modifications can be subject to various changes, substitutions, additions, omissions, and the like within the scope of the claims or their equivalents. [Industrial Applicability]

[0207] The battery and stacked battery according to the present disclosure can be used, for example, as a secondary battery such as an all-solid-state battery used in various electronic devices or automobiles. [Explanation of symbols]

[0208] 1, 1a Power generation element 2, 2a Main surface of electrode 3, 3a Opposite electrode principal surface 4, 4a Electrode exposed area 5, 5a Counter electrode exposure area 6, 6a 1st side 7, 7a 2nd side 8 Third aspect 10 electrode layer 11 Electrode current collector 12 Electrode active material layer 20 Counterpole Layer 21 Counter electrode current collector 22 Counter electrode active material layer 30 Solid electrolyte layer 40, 41, 42 Connection layer 50 battery cells 60, 60a, 60b, 60c, 60d Electrode insulating film 61, 61a, 61b, 61c, 61d First side surface covering portion 62, 62a, 62b, 62c, 62d Electrode main surface covering portion 65b, 66b, 75b, 76b Insulation layer 70, 70a, 70b, 70c, 70d, 70e Counter electrode insulating film 71, 71a, 71b, 71c, 71d, 71e Second side covering portion 72, 72a, 72b, 72c, 72d, 72e Counter electrode principal surface coating portion 80, 80a, 80c, 80d, 80e electrode terminal 81, 81a, 81c, 81d, 81e Counter electrode insulating film coating portion 82, 82a, 82c, 82d, 82e Electrode contact parts 90, 90a, 90c, 90d, 90e Counter electrode terminal 91, 91a, 91c, 91d, 91e Electrode insulating film covering portion 92, 92a, 92c, 92d, 92e Counter electrode contact parts 100, 200, 200a, 300, 300a, 400, 400a, 500 batteries 1000, 2000 stacked battery

Claims

1. a power generating element having at least one battery cell including an electrode layer, a counter electrode layer, and a solid electrolyte layer located between the electrode layer and the counter electrode layer; an electrode insulating film; a counter electrode insulating film; an electrode terminal electrically connected to the electrode layer; a counter electrode terminal electrically connected to the counter electrode layer; Equipped with the power-generating element has an electrode principal surface which is a principal surface formed by the surface of the electrode layer, a counter electrode principal surface which faces the electrode principal surface and is a principal surface formed by the surface of the counter electrode layer, and a side surface; the electrode insulating film has a first side surface covering portion that covers a part of the side surface and an electrode main surface covering portion that covers the electrode main surface, the counter electrode insulating film has a second side surface covering portion that covers another part of the side surface, and a counter electrode main surface covering portion that covers the counter electrode main surface, the electrode terminal has a counter electrode insulating film covering portion that covers the second side surface covering portion and an electrode contact portion that contacts the electrode main surface, the counter electrode terminal has an electrode insulating film covering portion that covers the first side surface covering portion and a counter electrode contact portion that contacts the counter electrode main surface, the electrode insulating film and the counter electrode insulating film each contain a first thermosetting resin; the electrode terminal and the counter electrode terminal each contain a second thermosetting resin; The curing temperature of the first thermosetting resin is equal to or higher than the curing temperature of the second thermosetting resin. battery.

2. the electrode principal surface has an electrode exposed region that is not covered by the electrode insulating film and the counter electrode insulating film at a position that overlaps with the counter electrode principal surface covering portion in a plan view, the counter electrode principal surface has a counter electrode exposed region that is not covered by the electrode insulating film and the counter electrode insulating film at a position that overlaps with the electrode principal surface covering portion in a plan view, the electrode contact portion is in contact with the electrode exposed region, the counter electrode contact portion is in contact with the counter electrode exposed region; The battery of claim 1 .

3. the counter electrode insulating film-coated portion covers the counter electrode principal surface-coated portion, the electrode insulating film covering portion covers the electrode main surface covering portion, The battery according to claim 1 or 2.

4. At least one of the electrode insulating film and the counter electrode insulating film contains a resin. The battery according to any one of claims 1 to 3.

5. The side surface includes a first side surface and a second side surface opposite to the first side surface, the first side surface covering portion covers the first side surface, The second side surface covering portion covers the second side surface. The battery of any one of claims 1 to 4.

6. At least one of the electrode terminal and the counter electrode terminal is made of a conductive material containing resin. The battery of any one of claims 1 to 5.

7. At least one of the electrode insulating film and the counter electrode insulating film has a laminated structure of a plurality of insulating layers. The battery of any one of claims 1 to 6.

8. the electrode insulating film and the counter electrode insulating film are in contact with each other between the electrode terminal and the counter electrode terminal; The battery of any one of claims 1 to 7.

9. the at least one battery cell is a plurality of battery cells; The plurality of battery cells are electrically connected in series and stacked. The battery of any one of claims 1 to 8.

10. The solid electrolyte layer contains a solid electrolyte having lithium ion conductivity.

10. The battery of claim 1.

11. A battery comprising a plurality of batteries according to any one of claims 1 to 10; The plurality of batteries are electrically connected in parallel and stacked. Stacked battery.

12. The plurality of batteries are stacked such that the electrode principal surfaces or the counter electrode principal surfaces of adjacent batteries are adjacent to each other. The stacked battery according to claim 11.

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