Solid-state battery package

Abstract

To provide solid-state battery packages with better resistance to external mechanical stress.SOLUTION: A solid-state battery package has a substrate, a solid-state battery on the substrate, and an exterior part covering the solid-state battery, and the exterior part has a plurality of corners, and at least the top side corner of the plurality of corners, includes an outwardly curved surface which is outwardly curved.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to solid-state battery packages, and more particularly to solid-state batteries packaged in a manner conducive to substrate mounting. [Background technology]

[0002] Secondary batteries that can be repeatedly charged and discharged have been used for a variety of purposes, including as power sources for electronic devices such as smartphones and laptop computers.

[0003] In secondary batteries, a liquid electrolyte is generally used as a medium for ion migration that contributes to charging and discharging. In other words, a so-called electrolytic solution is used in secondary batteries. However, such secondary batteries generally require safety in terms of preventing leakage of the electrolytic solution. In addition, organic solvents and the like used in the electrolytic solution are flammable, so safety is also required in this respect.

[0004] Therefore, research is being conducted into solid-state batteries that use solid electrolytes instead of liquid electrolytes. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-220107 [Patent Document 2] Japanese Patent Application Laid-Open No. 2010-503957 Summary of the Invention [Problem to be solved by the invention]

[0006] A solid-state battery is covered with a covering member to form a solid-state battery package to prevent the infiltration of water vapor (Patent Documents 1 and 2). Such a solid-state battery package may be exposed to external mechanical stress during the customer's mounting process or during handling in the market. In this case, if the solid-state battery or covering member includes a roughly 90-degree bent portion exposed to the outside, such as at a corner, as in Patent Documents 1 and 2, mechanical stress from external physical contact, etc., may be concentrated at the bent portion, resulting in defects such as chipping. Such defects in the solid-state battery or covering member may reduce the solid-state battery package's overall ability to prevent the infiltration of water vapor.

[0007] The present disclosure has been made in view of the above-mentioned problems, and a main object of the present disclosure is to provide a solid-state battery package with improved resistance to external mechanical stress. [Means for solving the problem]

[0008] In order to achieve the above object, in one embodiment of the present invention, a substrate, a solid-state battery provided on the substrate, and an exterior part covering the solid-state battery; The solid-state battery package includes a plurality of corner portions, and at least a top-side corner portion of the plurality of corner portions includes an outer curved surface that is curved outward. [Effects of the Invention]

[0009] A solid-state battery package according to an embodiment of the present invention has improved resistance to external mechanical stress. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a cross-sectional view schematically showing the internal structure of a solid-state battery according to one embodiment of the present invention. [Figure 2] FIG. 2 is a perspective view schematically showing a solid-state battery package according to one embodiment of the present invention. [Figure 3]FIG. 3 is a cross-sectional view schematically showing the configuration of a solid-state battery package according to one embodiment of the present invention. [Figure 4] FIG. 4 is an enlarged cross-sectional view schematically showing part A of the solid-state battery package shown in FIG. [Figure 5] FIG. 5 is an enlarged cross-sectional view schematically showing part A of a solid-state battery package according to another embodiment of the present invention. [Figure 6] FIG. 6 is an enlarged cross-sectional view schematically showing part A of a solid-state battery package according to another embodiment of the present invention. [Figure 7] FIG. 7 is a cross-sectional view schematically showing the configuration of a solid-state battery package according to one embodiment of the present invention. [Figure 8] FIG. 8 is an enlarged cross-sectional view schematically showing part B of the solid-state battery package shown in FIG. [Figure 9] FIG. 9 is a cross-sectional view schematically showing the configuration of a solid-state battery package according to another embodiment of the present invention. [Figure 10] FIG. 10 is a cross-sectional view schematically showing the configuration of a solid-state battery package according to another embodiment of the present invention. [Figure 11] FIG. 11 is a cross-sectional view schematically showing the configuration of a solid-state battery package according to another embodiment of the present invention. [Figure 12A] FIG. 12A is a cross-sectional view showing a process for manufacturing a solid-state battery package according to one embodiment of the present invention. [Figure 12B] FIG. 12B is a cross-sectional view showing a process for manufacturing a solid-state battery package according to one embodiment of the present invention. [Figure 12C] FIG. 12C is a cross-sectional view illustrating a process for manufacturing a solid-state battery package according to one embodiment of the present invention. [Figure 12D] FIG. 12D is a cross-sectional view showing a process for manufacturing a solid-state battery package according to one embodiment of the present invention. [Figure 12E] FIG. 12E is a cross-sectional view illustrating a process for manufacturing a solid-state battery package according to one embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0011] The solid-state battery package of the present invention will be described in detail below. Although the description will be made with reference to the drawings as necessary, the contents shown in the drawings are merely schematic and illustrative for understanding the present invention, and the appearance and dimensional ratios may differ from the actual product.

[0012] In this specification, the term "solid-state battery package" refers, in a broad sense, to a solid-state battery device configured to protect a solid-state battery from the external environment, and, in a narrow sense, to a solid-state battery device that includes a mountable substrate and protects a solid-state battery from the external environment.

[0013] The term "cross-sectional view" as used herein refers to the shape of a solid-state battery viewed from a direction substantially perpendicular to the stacking direction (in other words, the shape of a solid-state battery cut along a plane parallel to the thickness direction of the layers). The terms "planar view" and "planar shape" as used herein refer to a sketch of an object viewed from above or below along the thickness direction of the layers (i.e., the stacking direction).

[0014] The terms "upper and lower directions" and "left and right directions" used directly or indirectly in this specification correspond to the upper and lower directions and left and right directions in the drawings, respectively. Unless otherwise specified, the same symbols or signs indicate the same members or parts or the same meanings. In a preferred embodiment, the vertical downward direction (i.e., the direction in which gravity acts) can be considered to correspond to the "lower direction" / "bottom side," and the opposite direction can be considered to correspond to the "upper direction" / "top side."

[0015] Furthermore, in this specification, "on" a substrate, film, layer, etc., includes not only cases where it is in contact with the upper surface of the substrate, film, or layer, but also cases where it is not in contact with the upper surface of the substrate, film, or layer. In other words, "on" a substrate, film, or layer includes cases where a new film or layer is formed above the substrate, film, or layer, and / or cases where another film or layer is interposed between the substrate, film, or layer. Furthermore, "on" does not necessarily mean the upper side in the vertical direction. "On" merely indicates the relative positional relationship of the substrate, film, layer, etc.

[0016] [Basic structure of secondary batteries] The term "secondary battery" as used herein refers to a battery that can be repeatedly charged and discharged. Therefore, the secondary battery according to the present invention is not limited to the name, and may also include, for example, an electricity storage device.

[0017] In the present invention, the term "solid-state battery" broadly refers to a battery whose components are made of solids, and in the narrow sense refers to an all-solid-state battery whose components (particularly preferably all components) are made of solids. In a preferred embodiment, the solid-state battery of the present invention is a stacked-type solid-state battery in which each layer constituting a battery unit is stacked on top of each other, and preferably each such layer is made of a sintered body. The term "solid-state battery" encompasses not only so-called "secondary batteries" that can be repeatedly charged and discharged, but also "primary batteries" that can only discharge. According to a preferred embodiment of the present invention, the "solid-state battery" is a secondary battery. The term "secondary battery" should not be overly limited to its name, and can also include, for example, an electricity storage device. In the present invention, a solid-state battery contained in a package can also be referred to as a "solid-state battery element."

[0018] The basic structure of the solid-state battery of the present invention will be described below. The structure of the solid-state battery described here is merely an example for understanding the invention and is not intended to limit the invention.

[0019] [Basic structure of solid-state batteries] A solid-state battery has at least positive and negative electrode layers and a solid electrolyte. Specifically, as shown in Fig. 1, a solid-state battery 100 includes a solid-state battery stack including battery constituent units each consisting of a positive electrode layer 110, a negative electrode layer 120, and a solid electrolyte 130 interposed therebetween.

[0020] The layers constituting the solid-state battery may be formed by firing, and the positive electrode layer, the negative electrode layer, the solid electrolyte, etc. may form fired layers. Preferably, the positive electrode layer, the negative electrode layer, and the solid electrolyte are each fired together, and therefore the solid-state battery laminate forms a fired body.

[0021] The positive electrode layer is an electrode layer containing at least a positive electrode active material. The positive electrode layer may further contain a solid electrolyte. In a preferred embodiment, the positive electrode layer is composed of a sintered body containing at least positive electrode active material particles and solid electrolyte particles. On the other hand, the negative electrode layer is an electrode layer containing at least a negative electrode active material. The negative electrode layer may further contain a solid electrolyte. In a preferred embodiment, the negative electrode layer is composed of a sintered body containing at least a negative electrode active material particles and solid electrolyte particles.

[0022] The positive electrode active material and the negative electrode active material are substances involved in the transfer of electrons in a solid-state battery. Charging and discharging are performed by the transfer of electrons caused by the movement (conduction) of ions between the positive electrode layer and the negative electrode layer via the solid electrolyte. It is preferable that each electrode layer, the positive electrode layer and the negative electrode layer, is a layer capable of absorbing and releasing lithium ions or sodium ions in particular. In other words, the solid-state battery is preferably an all-solid-state secondary battery in which lithium ions or sodium ions move between the positive electrode layer and the negative electrode layer via the solid electrolyte to charge and discharge the battery.

[0023] (Cathode active material) The positive electrode active material contained in the positive electrode layer may be at least one selected from the group consisting of a lithium-containing phosphate compound having a Nasicon structure, a lithium-containing phosphate compound having an olivine structure, a lithium-containing layered oxide, and a lithium-containing oxide having a spinel structure. An example of a lithium-containing phosphate compound having a Nasicon structure is Li3V2(PO4)3. An example of a lithium-containing phosphate compound having an olivine structure is Li3Fe2(PO4)3, LiFePO4, and / or LiMnPO4. An example of a lithium-containing layered oxide is LiCoO2 and / or LiCo 1 / 3 Ni 1 / 3 Mn 1 / 3 Examples of lithium-containing oxides having a spinel structure include LiMn2O4 and / or LiNi 0.5 Mn 1.5 O4, etc. The type of lithium compound is not particularly limited, but may be, for example, a lithium transition metal composite oxide or a lithium transition metal phosphate compound. Lithium transition metal composite oxide is a general term for oxides containing lithium and one or more transition metal elements as constituent elements, and lithium transition metal phosphate compound is a general term for phosphate compounds containing lithium and one or more transition metal elements as constituent elements. The type of transition metal element is not particularly limited, but may be, for example, cobalt (Co), nickel (Ni), manganese (Mn), iron (Fe), etc.

[0024] In addition, the positive electrode active material capable of absorbing and releasing sodium ions may be at least one selected from the group consisting of sodium-containing phosphate compounds having a Nasicon structure, sodium-containing phosphate compounds having an olivine structure, sodium-containing layered oxides, and sodium-containing oxides having a spinel structure. For example, the sodium-containing phosphate compounds may be at least one selected from the group consisting of Na3V2(PO4)3, NaCoFe2(PO4)3, Na2Ni2Fe(PO4)3, Na3Fe2(PO4)3, Na2FeP2O7, Na4Fe3(PO4)2(PO2O7), and the sodium-containing layered oxide may be at least one selected from the group consisting of NaFeO2.

[0025] Alternatively, the positive electrode active material may be, for example, an oxide, a disulfide, a chalcogenide, or a conductive polymer. The oxide may be, for example, titanium oxide, vanadium oxide, or manganese dioxide. The disulfide may be, for example, titanium disulfide or molybdenum sulfide. The chalcogenide may be, for example, niobium selenide. The conductive polymer may be, for example, a disulfide, polypyrrole, polyaniline, polythiophene, polyparastyrene, polyacetylene, or polyacene.

[0026] (Negative electrode active material) Examples of the negative electrode active material contained in the negative electrode layer include at least one selected from the group consisting of oxides containing at least one element selected from the group consisting of titanium (Ti), silicon (Si), tin (Sn), chromium (Cr), iron (Fe), niobium (Nb), and molybdenum (Mo), carbon materials such as graphite, graphite-lithium compounds, lithium alloys, lithium-containing phosphate compounds having a Nasicon structure, lithium-containing phosphate compounds having an olivine structure, and lithium-containing oxides having a spinel structure. An example of a lithium alloy is Li-Al. An example of a lithium-containing phosphate compound having a Nasicon structure is Li3V2(PO4)3 and / or LiTi2(PO4)3. An example of a lithium-containing phosphate compound having an olivine structure is Li3Fe2(PO4)3 and / or LiCuPO4. An example of a lithium-containing oxide having a spinel structure is Li4Ti5O. 12 etc.

[0027] In addition, the negative electrode active material capable of absorbing and releasing sodium ions may be at least one selected from the group consisting of sodium-containing phosphate compounds having a Nasicon structure, sodium-containing phosphate compounds having an olivine structure, and sodium-containing oxides having a spinel structure.

[0028] In the solid-state battery, the positive electrode layer and the negative electrode layer may be made of the same material.

[0029] The positive electrode layer and / or the negative electrode layer may contain a conductive material, which may include at least one of metal materials such as silver, palladium, gold, platinum, aluminum, copper, and nickel, and carbon.

[0030] Furthermore, the positive electrode layer and / or the negative electrode layer may contain a sintering aid, such as at least one selected from the group consisting of lithium oxide, sodium oxide, potassium oxide, boron oxide, silicon oxide, bismuth oxide, and phosphorus oxide.

[0031] There are no particular limitations on the thickness of the positive electrode layer and the negative electrode layer, but for example, they may each independently be 2 μm or more and 50 μm or less, particularly 5 μm or more and 30 μm or less.

[0032] (Positive electrode current collecting layer / Negative electrode current collecting layer) Although not essential elements of the electrode layer, the positive electrode layer and the negative electrode layer may each include a positive electrode current collector layer and a negative electrode current collector layer. The positive electrode current collector layer and the negative electrode current collector layer may each be in the form of a foil. However, if greater emphasis is placed on improving electronic conductivity through co-firing, reducing the manufacturing cost of the solid-state battery, and / or reducing the internal resistance of the solid-state battery, the positive electrode current collector and the negative electrode current collector may each be in the form of a sintered body. The positive electrode current collector constituting the positive electrode current collector and the negative electrode current collector constituting the negative electrode current collector are preferably made of a material with high conductivity, such as silver, palladium, gold, platinum, aluminum, copper, and / or nickel. The positive electrode current collector and the negative electrode current collector may each have an electrical connection portion for electrical connection to the outside and may be configured to be electrically connectable to an end electrode. Note that when the positive electrode current collector and the negative electrode current collector are in the form of a sintered body, they may be composed of a sintered body containing a conductive material and a sintering aid. The conductive materials contained in the positive electrode current collecting layer and the negative electrode current collecting layer may be selected from, for example, the same materials as the conductive materials that may be contained in the positive electrode layer and the negative electrode layer. The sintering aids contained in the positive electrode current collecting layer and the negative electrode current collecting layer may be selected from, for example, the same materials as the sintering aids that may be contained in the positive electrode layer and the negative electrode layer. As described above, the positive electrode current collecting layer and the negative electrode current collecting layer are not essential for a solid-state battery, and a solid-state battery that does not include such a positive electrode current collecting layer and a negative electrode current collecting layer is also conceivable. In other words, the solid-state battery included in the package of the present invention may be a solid-state battery without a current collecting layer.

[0033] (solid electrolyte) The solid electrolyte is a material capable of conducting lithium ions or sodium ions. In particular, the solid electrolyte constituting a battery unit in a solid-state battery may form a layer capable of conducting lithium ions between the positive electrode layer and the negative electrode layer. The solid electrolyte may be provided at least between the positive electrode layer and the negative electrode layer. In other words, the solid electrolyte may be present around the positive electrode layer and / or the negative electrode layer so as to protrude from between the positive electrode layer and the negative electrode layer. Specific solid electrolytes include, for example, one or more of a crystalline solid electrolyte, a glass-based solid electrolyte, and a glass-ceramic-based solid electrolyte.

[0034] The crystalline solid electrolyte may be, for example, an oxide-based crystalline material or a sulfide-based crystalline material, etc. Examples of the oxide-based crystalline material include a lithium-containing phosphate compound having a Nasicon structure, an oxide having a perovskite structure, an oxide having a garnet-type or garnet-like structure, and an oxide glass ceramic-based lithium ion conductor.

[0035] Lithium-containing phosphate compounds with a Nasicon structure include Li x M y (PO4)3 (1≦x≦2, 1≦y≦2, M is at least one selected from the group consisting of titanium (Ti), germanium (Ge), aluminum (Al), gallium (Ga) and zirconium (Zr)). An example of a lithium-containing phosphate compound having a Nasicon structure is, for example, Li 1.2 Al 0.2 Ti 1.8 (PO4)3, etc. An example of an oxide with a perovskite structure is La 0.55 Li 0.35 Examples of oxides with garnet or garnet-like structures include Li7La3Zr2O 12 Examples of sulfide-based crystal materials include thio-LISICON, for example, Li 3.25 Ge 0.25 P 0.75 S4 and Li10 GeP2S 12 The crystalline solid electrolyte may include a polymer material (for example, polyethylene oxide (PEO)).

[0036] Glass-based solid electrolytes include, for example, oxide-based glass materials and sulfide-based glass materials. Examples of oxide-based glass materials include 50Li4SiO4·50Li3BO3. Examples of sulfide-based glass materials include 30Li2S·26B2S3·44LiI, 63Li2S·36SiS2·1Li3PO4, 57Li2S·38SiS2·5Li4SiO4, 70Li2S·30P2S5, and 50Li2S·50GeS2.

[0037] The glass ceramic solid electrolyte is, for example, an oxide-based glass ceramic material or a sulfide-based glass ceramic material. As the oxide-based glass ceramic material, for example, a phosphate compound containing lithium, aluminum, and titanium as constituent elements (LATP) or a phosphate compound containing lithium, aluminum, and germanium as constituent elements (LAGP) can be used. LATP is, for example, Li 1.07 Al 0.69 Ti 1.46 (PO4)3, etc. Also, LAGP is, for example, Li 1.5 Al 0.5 Ge 1.5 (PO4), etc. Examples of sulfide-based glass ceramic materials include Li7P3S 11 and Li 3.25 P 0.95 Examples include S4.

[0038] In addition, examples of solid electrolytes capable of conducting sodium ions include sodium-containing phosphate compounds having a Nasicon structure, oxides having a perovskite structure, and oxides having a garnet or garnet-like structure. Examples of sodium-containing phosphate compounds having a Nasicon structure include Na x M y(PO4)3 (1≦x≦2, 1≦y≦2, M is at least one selected from the group consisting of Ti, Ge, Al, Ga and Zr).

[0039] The solid electrolyte may contain a sintering aid. The sintering aid contained in the solid electrolyte may be selected from the same materials as the sintering aids that may be contained in the positive electrode layer and the negative electrode layer, for example.

[0040] The thickness of the solid electrolyte is not particularly limited. The thickness of the solid electrolyte layer located between the positive electrode layer and the negative electrode layer may be, for example, 1 μm to 15 μm, particularly 1 μm to 5 μm.

[0041] (end face electrode) The solid-state battery 100 is generally provided with end electrodes 140. In particular, the end electrodes are provided on the side surfaces of the solid-state battery 100. More specifically, a positive end electrode 140A connected to the positive electrode layer 110 and a negative end electrode 140B connected to the negative electrode layer 120 are provided (see FIG. 1). Such end electrodes preferably contain a material with high conductivity. Specific materials for the end electrodes are not particularly limited, but may include at least one selected from the group consisting of silver, gold, platinum, aluminum, copper, tin, and nickel.

[0042] [Basic structure of solid-state battery package] The present invention is a packaged solid-state battery, that is, a solid-state battery package having a mountable substrate and a configuration in which the solid-state battery is protected from the external environment.

[0043] Fig. 2 is a perspective view that schematically shows a solid-state battery package according to one embodiment of the present invention. Fig. 3 is a cross-sectional view that schematically shows the configuration of a solid-state battery package according to one embodiment of the present invention. As shown in Fig. 3, a solid-state battery package 1000 according to one embodiment of the present invention includes a substrate 200 that supports a solid-state battery 100. Specifically, the solid-state battery package 1000 includes a mountable substrate 200 and a solid-state battery 100 that is provided on the substrate 200 and protected from the external environment.

[0044] As shown in FIG. 3 , the substrate 200 has a main surface larger than that of, for example, a solid-state battery. The substrate 200 may be a resin substrate or a ceramic substrate. In short, the substrate 200 may be a printed wiring board, a flexible substrate, an LTCC substrate, an HTCC substrate, or the like. When the substrate 200 is a resin substrate, the substrate 200 may be a substrate configured to contain a resin as a base material, for example, a substrate having a laminate structure including a resin layer. The resin material of such a resin layer may be any thermoplastic resin and / or any thermosetting resin. The resin layer may also be configured, for example, by impregnating glass fiber cloth with a resin material such as epoxy resin.

[0045] The substrate is preferably a component for the external terminals of the packaged solid-state battery. In other words, it can be said that the substrate serves as a terminal substrate for the external terminals of the solid-state battery. A solid-state battery package including such a substrate can mount the solid-state battery on another secondary substrate such as a printed wiring board with the substrate interposed therebetween. For example, the solid-state battery can be surface-mounted via the substrate through solder reflow or the like. For these reasons, the solid-state battery package of the present invention is preferably an SMD (Surface Mount Device) type battery package.

[0046] Such a substrate can be configured to support a solid-state battery, and can also be considered a support substrate. Furthermore, since the substrate is a terminal substrate, it preferably has wiring or an electrode layer, and in particular, an electrode layer that electrically connects the upper and lower surfaces or the upper and lower surface layers. That is, as shown in FIG. 3 , the substrate may have a first main surface facing the solid-state battery and a second main surface located opposite the first main surface, and the electrode layer may electrically connect the first main surface and the second main surface. In a preferred embodiment, the substrate has wiring or an electrode layer that electrically connects the first and second main surfaces of the substrate, and serves as a terminal substrate for the external terminals of a packaged solid-state battery. In this embodiment, the wiring of the substrate can be used to connect the solid-state battery to the external terminals, eliminating the need to package the solid-state battery in an exterior part (described later) and then connect the external terminals to the exterior of the exterior part, thereby increasing the design flexibility of the external terminals.

[0047] A substrate 200 according to a preferred embodiment includes electrode layers (an upper principal surface electrode layer 210 and a lower principal surface electrode layer 220) that electrically connect the upper and lower principal surfaces of the substrate, and serves as a component for the external terminals of a packaged solid-state battery (see FIG. 3 ). In a solid-state battery package including such a substrate, the electrode layers of the substrate and the terminal portions of the solid-state battery are connected to each other. Preferably, the electrode layers of the substrate and the end electrodes of the solid-state battery are electrically connected to each other. For example, the end electrode 140A on the positive electrode side of the solid-state battery is electrically connected to the electrode layers (210A, 220A) on the positive electrode side of the substrate. Meanwhile, the end electrode 140B on the negative electrode side of the solid-state battery is electrically connected to the electrode layers (210B, 220B) on the negative electrode side of the substrate. This allows the electrode layers on the positive and negative electrode sides of the substrate (particularly, the electrode layers located on the lower / bottom side of the packaged product, or the lands connected thereto) to serve as the positive and negative terminals of the solid-state battery package, respectively.

[0048] In order to enable electrical connection between the solid-state battery 100 and the substrate electrode layer 210 of the substrate 200, the end surface electrode 140 of the solid-state battery 100 and the substrate electrode layer 210 of the substrate 200 can be connected via a bonding member 600. This bonding member 600 is responsible for at least the electrical connection between the end surface electrode 140 of the solid-state battery 100 and the substrate 200, and may include, for example, a conductive adhesive. As an example, the bonding member 600 may be made of an epoxy-based conductive adhesive containing a metal filler such as Ag.

[0049] Furthermore, in one embodiment of the present invention, not only the substrate 200 but also the solid-state battery package 1000 itself can be configured to prevent water vapor permeation as a whole. For example, the solid-state battery package 1000 according to one embodiment of the present invention can be covered with an exterior part 150 so that the solid-state battery 100 provided on the substrate 200 is entirely enclosed. Specifically, the solid-state battery 100 on the substrate 200 can be packaged so that the main surface 100A and the side surface 100B are enclosed by the exterior part 150. With this configuration, all surfaces constituting the solid-state battery 100 are not exposed to the outside, and therefore, water vapor permeation (i.e., intrusion of water vapor into the solid-state battery) can be suitably prevented.

[0050] In this specification, "water vapor" is not limited to gaseous water, but also includes liquid water. In other words, the term "water vapor" is used to broadly encompass gaseous water, liquid water, and the like, regardless of the physical state. Therefore, "water vapor" can also be referred to as moisture, and liquid water in particular can include condensed water formed by condensation of gaseous water. Since the intrusion of water vapor into a solid-state battery can cause deterioration of battery characteristics, the above-described packaged solid-state battery configuration contributes to extending the battery characteristics and life of the solid-state battery.

[0051] For example, as shown in FIG. 3 , the exterior part 150 may be composed of a coating insulating layer 160 and a coating inorganic layer 170. The solid-state battery 100 may have a configuration in which the exterior part 150 is covered with the coating insulating layer 160 and the coating inorganic layer 170. The coating inorganic layer 170 is provided to cover the coating insulating layer 160. Since the coating inorganic layer 170 is positioned on the coating insulating layer 160, it has a configuration in which, together with the coating insulating layer 160, it largely envelops the solid-state battery 100 on the substrate 200 as a whole. Furthermore, the coating inorganic layer 170 may also cover the side surface 250 of the substrate 200. The coating insulating layer is formed so as to form a suitable water vapor barrier in cooperation with the coating inorganic layer, and the coating inorganic layer is also formed so as to form a suitable water vapor barrier in cooperation with the coating insulating layer. The coating insulating layer may extend onto the side surface of the substrate. In other words, the covering insulating layer covering the top and side regions of the solid-state battery 100 may also cover the side surfaces of the substrate, with the covering inorganic layer being provided on the covering insulating layer (see FIGS. 9 and 11).

[0052] The material of the covering insulating layer may be any type as long as it exhibits insulating properties. For example, the covering insulating layer may contain a resin, which may be either a thermosetting resin or a thermoplastic resin. The covering insulating layer may contain an inorganic filler. As just one example, the covering insulating layer may be made of an epoxy-based resin containing an inorganic filler such as SiC.

[0053] The material of the coated inorganic layer is not particularly limited and may be metal, glass, oxide ceramic, or a mixture thereof. The coated inorganic layer may correspond to an inorganic layer having a thin film form, such as a metal film. By way of example only, the coated inorganic layer may be made of a Cu-based and / or Ni-based material plated to a thickness of 2 μm to 50 μm.

[0054] [Features of the solid-state battery package of the present invention] The inventors of the present application have conducted extensive research into solutions for improving the resistance of the above-described solid-state battery package 1000 to external mechanical stress to which it may be subjected, and as a result have devised the present invention having the following technical idea.

[0055] The present disclosure has a technical idea that "an exterior part covering a solid-state battery has a structure including a curved surface." More specifically, the present disclosure has a technical idea that "an edge bending part of the exterior part has a structure including a curved surface that curves outward."

[0056] Here, the term "edge bend" in this specification refers to an angled portion at the edge of each surface region of the solid-state battery package, and may also be referred to as an "edge corner" or "edge fold." Specifically, the "edge bend" includes corners 151a, 151b and / or ridge 152 (see FIG. 1). The term "corner" refers to a portion where three or more adjacent surface regions that extend in different directions intersect. The term "ridge" refers to a boundary portion where two adjacent surface regions that extend in different directions intersect, and may also be referred to as a "ridge corner" (see FIG. 1).

[0057] To realize the above technical idea, the present disclosure has the following technical features. As shown in FIGS. 1 and 3 , an exterior part 150 provided to cover the solid-state battery 100 includes a plurality of surface regions and a plurality of corner parts. In one embodiment of the present invention, the exterior part 150 may include corner parts 151 having a rounded outer shape including a curved surface. Specifically, of the plurality of corner parts 151 of the exterior part 150, at least a top-side corner part 151a located on the top-side region 1000A side of the solid-state battery package has an outer curved surface 180 that curves outward.

[0058] The "top surface region 1000A" as used herein refers to a principal surface region that is located relatively far from the substrate 200 among the surface regions that constitute the solid-state battery package 1000. In other words, assuming a typical solid-state battery package having two opposing principal surface regions, the "top surface region 1000A" as used herein refers to one of these principal surface regions, and particularly refers to the principal surface region opposite the principal surface region that faces the substrate (i.e., the principal surface region on the mounting surface side in an SMD type, which may also be referred to as the "bottom surface region" or "lower surface region"). The "top surface region 1000A" may also be referred to as the "top surface region" or "upper surface region," for example.

[0059] That is, the exterior part 150 of the present disclosure may include an outer curved surface 180 at least at the top corner part 151a located distal to the substrate 200 (see FIG. 3). Here, the "outer curved surface" in this specification means a surface that is curved so as to be convex outward from the solid-state battery package 1000. In other words, the top corner part 151a of the exterior part 150 may have a rounded surface that is curved so as to be convex outward from the solid-state battery package 1000. For example, the outer curved surface 180 may have an R-chamfered shape in which the top corner part 151a of the exterior part 150 is chamfered in an arc shape.

[0060] For example, in the cross-sectional view shown in FIG. 3, the top-side corner portion 151a including the outer curved surface 180 may include a curve that is curved outward in a substantially arc-like shape (i.e., a convex arc-like shape). Here, the term "substantially arc-like" as used herein does not necessarily refer to a portion of a perfect circle, but also encompasses shapes that follow various smoothly curved curves, such as a portion of an ellipse and curves that can approximate these. In other words, a "substantially arc-like curve" refers to a curve that is arc-like from a macroscopic perspective, and may include straight or bent lines from a microscopic perspective. Therefore, an outer curved surface that includes a substantially arc-like curve in a cross-sectional view does not necessarily need to be a smooth curved surface, but may also include irregular asperities or undulations.

[0061] The top corner 151a, located in the top region 1000A opposite the bottom region 1000B where the solid-state battery package is mounted, is susceptible to mechanical stress due to external physical contact, etc., even after mounting on a substrate (see FIG. 1 ). This configuration effectively prevents unintended external forces from concentrating on the top corner 151a, even when the solid-state battery package is exposed to external mechanical stress, and prevents the top corner 151a from becoming a fracture initiation point of the exterior part 150. Specifically, since the exterior part 150 includes an outer curved surface, external forces applied to the top corner 151a can be dispersed over the entire curved surface without being concentrated locally, thereby more effectively preventing damage and breakage of the exterior part due to external mechanical stress. Therefore, according to the present disclosure, the top corner including the outer curved surface prevents external mechanical stress from concentrating on the bent edge portion of the exterior part, thereby providing a solid-state battery package with improved resistance to mechanical stress.

[0062] As described above, the exterior portion contributes to preventing water vapor from penetrating into the solid-state battery. According to the structure of the present disclosure, damage to the exterior portion due to mechanical stress, such as vibration or physical contact, during transportation, installation, or use of the solid-state battery package is preferably suppressed, thereby improving the reliability of the water vapor penetration prevention function of the solid-state battery package. Furthermore, the structure of the present disclosure can improve resistance to external mechanical stress without increasing the thickness of the exterior portion, thereby preferably contributing to the miniaturization of the solid-state battery package.

[0063] In one embodiment, exterior portion 150 may have a rounded outer shape even at ridge portion 152 (see FIG. 2). In particular, exterior portion 150 may include a surface that curves outward so that top surface side ridge portion 152a located on the top surface region 1000A side is rounded. Specifically, exterior portion 150 may include a plurality of top surface side corner portions 151a, and of the plurality of top surface side corner portions 151a, top surface side ridge portion 152a connecting adjacent top surface side corner portions may include an outward curved surface. This means that ridge portion 152a connecting adjacent first top surface side corner portion and second top surface side corner portion includes an outward curved surface.

[0064] The top ridge 152a extends in different directions and corresponds to the boundary between the adjacent first and second surface regions, and the outer curved surface of the top ridge 152a can also be understood as a surface extending from the first surface region to the second surface region. For example, in an embodiment in which the exterior portion 150 is provided on the top surface region 1000A of the solid-state battery package and on the side surface region 1000C adjacent to the top surface region 1000A as shown in FIG. 2, the outer curved surface of the top ridge 152a may be formed to extend from the top surface region 1000A to the side surface region 1000C.

[0065] In this configuration, the exterior portion 150 may include an outer curved surface so that all of the bent edges located on the top region 1000A side of the solid-state battery package are rounded. That is, the exterior portion 150 may have a structure in which the top-side corners 151a and the top-side ridges 152a located distal to the substrate 200 each include an outer curved surface. With this configuration, external mechanical stress applied to the bent edges located on the top region side can be suitably dispersed by the outer curved surface. Therefore, concentration of external mechanical stress on the bent edges is further suppressed, improving resistance to mechanical stress and suitably preventing damage such as chipping in the exterior portion.

[0066] 7 to 11 are cross-sectional views schematically illustrating solid-state battery packages according to various embodiments of the present invention. FIG. 8 is an enlarged cross-sectional view schematically illustrating portion B of FIG. 7. As illustrated, the exterior portion 150 may extend to cover the side surface 200C connecting the first main surface 200A and the second main surface 200B of the substrate 200. The corner portion 151b of the exterior portion 150 located on the corner portion 200b of the substrate may have a rounded, curved outer shape. Since the corner portion 151b is located on the bottom surface region 1000B side opposite the top surface region 1000A of the solid-state battery package, it can be referred to as a bottom-side corner portion 151b. Therefore, as shown in FIG. 7, the exterior portion 150 may have a structure in which the bottom-side corner portion 151b, where the bottom surface region 1000B and the multiple side surface regions 1000C of the solid-state battery package intersect, includes an outer curved surface. The bottom corner portion 151b is particularly susceptible to mechanical stress due to contact and collision with another secondary substrate such as a printed wiring board during the customer's mounting process of the solid-state battery package. This structure can further prevent external mechanical stress from concentrating on the corner portion, and can effectively prevent damage to the exterior portion and the substrate located inside the exterior portion.

[0067] In one embodiment of the present disclosure, the exterior part 150 may also have a rounded outer shape at the bottom-side ridge 152b located on the bottom region 1000B side of the solid-state battery package (see FIG. 2). Specifically, the bottom-side ridge 152b connecting adjacent bottom-side corners may include an outer curved surface. That is, among the multiple bottom-side corners 151b, the bottom-side ridge 152b connecting the adjacent first and second bottom-side corners may include an outer curved surface. This configuration may particularly prevent external mechanical stress applied to the bottom region of the solid-state battery package during the mounting process from concentrating on the ridge. Therefore, the present disclosure may provide a solid-state battery package with improved resistance to external mechanical stress.

[0068] In another embodiment of the present invention, the side ridge 152c of the exterior part 150 located on the side of the side region 1000C connecting the bottom region 1000B and the top region 1000A of the solid-state battery package 1000 may also have a rounded outer shape (see FIGS. 2 and 3). Specifically, the side ridge 152c connecting the top corner 151a and the bottom corner 151b of the exterior part 150 may include an outer curved surface. This means that the outer curved surface extends from one side region to the other side region at the side ridge 152c, which is the boundary between the two side region 1000B of the adjacent exterior parts 150. This configuration can provide a solid-state battery package that can prevent external mechanical stress on the side region side of the solid-state battery package from concentrating on the ridge.

[0069] As shown in FIG. 3 , in the present disclosure, the exterior portion 150 is provided to cover the end electrode 140 provided on the side surface 100C of the solid-state battery 100. In other words, the end electrode 140 is covered by the exterior portion 150 without being exposed to the outside. Therefore, the exterior portion 150 of the present disclosure effectively protects the end electrode 140 from mechanical stress from the external environment, thereby contributing to preventing water vapor from penetrating into the solid-state battery 100 from the end electrode 140 side. In other words, this structure provides better protection for the end electrode 140 than when the end electrode 140 is exposed to the outside. Furthermore, the solid-state battery 100 can be more effectively protected from water vapor penetration, thereby providing a more reliable solid-state battery package. Furthermore, in the solid-state battery package of the present disclosure, as described above, the exterior portion 150 also includes an outer curved surface at the side edge portion 152c (see FIG. 2 ) covering the end electrode 140. Therefore, the influence of external mechanical stress on the end electrodes 140 is further alleviated, and a solid-state battery package with superior resistance to mechanical stress can be provided.

[0070] Furthermore, the solid-state battery 100 of the present disclosure may have a rectangular cross-sectional shape as shown in FIG. 3 . That is, the solid-state battery 100 covered by the exterior part 150 including the above-described outer curved surface may have a rectangular cross-sectional shape. More specifically, in the solid-state battery package 1000 of the present disclosure, the bent edge portion of the solid-state battery 100 may be angular, bending at approximately 90 degrees, and the exterior part 150 covering the solid-state battery 100 may have a rounded shape including the outer curved surface at the bent edge portion. By having the exterior part 150 have a rounded shape as described above, the solid-state battery 100 having an angular shape can be suitably protected from external mechanical stress. That is, according to the present disclosure, even if the shape of the solid-state battery 100 has an angular shape that is relatively susceptible to the effects of mechanical stress, covering it with a rounded exterior part can improve resistance to external mechanical stress. Furthermore, compared to a solid-state battery 100 having a rounded, chamfered shape, the solid-state battery 100 of the present disclosure having a rectangular cross-sectional shape (i.e., a shape without chamfering) has a larger battery volume and can therefore have a higher capacity. Therefore, the present disclosure can provide a high-capacity solid-state battery package having improved resistance to external mechanical stress.

[0071] 4 is an enlarged cross-sectional view schematically showing portion A, including the outer curved surface, of the solid-state battery package shown in FIG. 3. As described above, the exterior part 150 includes a coated insulating layer 160 that covers the solid-state battery 100 on the substrate, and a coated inorganic layer 170 provided on the coated insulating layer 160. At least the coated inorganic layer 170, which forms the outermost layer of the solid-state battery package, may be rounded at the bent edge part of the exterior part 150, including the outer curved surface 180. That is, the outer curved surface 180 of the bent edge part of the exterior part 150 corresponds to the curved surface of the coated inorganic layer 170, which is the outermost layer of the exterior part 150, and may also be referred to as the curved inorganic surface 170a.

[0072] In other words, the curved inorganic surface 170a may be the outer surface of the coated inorganic layer 170, which is the outermost layer of the exterior package 150. That is, the curved inorganic surface 170a may be a part of the outer surface of the coated inorganic layer 170 that defines the outer contour of the solid-state battery package. When at least the coated inorganic layer 170 located at the outermost portion of the exterior package 150 includes the curved inorganic surface 170a that curves outward, the effects of external mechanical stress can be alleviated. Therefore, the concentration of external mechanical stress at the edge bend portion can be more effectively suppressed. As a result, the solid-state battery package of the present disclosure can contribute to improving the overall resistance of the exterior package to external mechanical stress.

[0073] As shown in FIG. 4 , in a cross-sectional view, the coating insulating layer 160 may include a curved insulating surface 160a that curves outward at the bent edge portion of the exterior part 150 having the outer curved surface. That is, the coating insulating layer 160 located inside the curved inorganic surface 170a may also be curved outward. In other words, the curved inorganic surface 170a may be provided on the curved insulating surface 160a. This means that at the bent edge portion of the exterior part 150 including the outer curved surface 170a, both the coating insulating layer 160 and the coating inorganic layer 170 that constitute the exterior part 150 include surfaces that are curved so as to be convex outward.

[0074] In such an embodiment, the coated inorganic layer 170 may be curved in a band-like shape in a cross-sectional view, and the coated insulating layer 160 may be curved to fit the shape of the inner surface of the coated inorganic layer 170. In other words, the coated inorganic layer 170 may be curved in a band-like shape to fit the outer curved surface of the coated insulating layer 160. Furthermore, as shown in FIGS. 7 and 8 , in an embodiment in which only the coated inorganic layer 170 is provided to cover the side surface of the substrate, the substrate 200 located inside the curved inorganic surface 170b on the bottom region 1000B side may also be curved outward. Specifically, the ridges and corners 200b of the substrate 200 located inside the exterior portion 150 may be curved outward so as to be rounded. In such an embodiment, the substrate may be curved to fit the shape of the inner surface of the outwardly curved coated inorganic layer 170. In other words, in a cross-sectional view, the coated inorganic layer 170 may be curved in a band-like shape to fit the curved surface of the substrate 200. This can also be interpreted as the curved inorganic surface 170 b included in the coated inorganic layer 170 having a curved shape that follows the shape of the curved surface of the substrate 200 .

[0075] According to this configuration, not only the outermost layer but also the coating insulating layer 160 and / or the substrate 200 located further inside include curved surfaces, which can prevent external mechanical stress from concentrating on the bent edge portions of the coating insulating layer 160 and / or the substrate 200. The curved surfaces provided on both the coating inorganic layer 170 constituting the exterior part 150 and the coating insulating layer 160 and / or the substrate 200 can more effectively diffuse mechanical stress applied from the outside to the coating inorganic layer 170. Therefore, concentration of mechanical stress on the bent edge portions is suitably prevented, and a solid-state battery package with improved resistance to external mechanical stress can be provided.

[0076] Furthermore, the above-described configuration can also suppress damage to the exterior portion due to expansion and contraction of the solid-state battery during charging and discharging. Specifically, stress can act from the solid-state battery to the exterior portion due to expansion and contraction. The curved edge portion of the exterior portion is prone to stress concentration and has inferior strength compared to other parts, so it is easily affected by stress due to such expansion and contraction. By having the coating insulating layer and the coating inorganic layer have an outwardly curved shape, it can be possible to alleviate the stress acting on the curved edge portion of the exterior portion from the above-described solid-state battery.

[0077] In one embodiment, the coated inorganic layer 170 may extend from the side surface 200C of the substrate to the second main surface 200B of the substrate located on the bottom region 1000B side of the solid-state battery package (see FIG. 10 ). That is, the coated inorganic layer 170 may extend beyond the side surface 200C of the substrate to the second main surface 200B of the substrate. In such a configuration, the curved inorganic surface 170b located on the bottom region 1000B side of the solid-state battery package may extend around to the second main surface 200B of the substrate to cover the bent edge portion located on the second main surface 200B side of the substrate. In other words, the corner portion 200b and ridge portion located on the second main surface 200B side of the substrate may be covered by the curved inorganic surface 170b. By providing the curved inorganic surface so as to cover the bent edge portion of the substrate, it is possible to more effectively protect the bent edge portion of the substrate from mechanical stress that may be applied from the bottom side of the solid-state battery package.

[0078] 9, the covering insulating layer 160 may extend onto the side surface 200C of the substrate. In such a configuration, the covering insulating layer 160 covering the side surface 200C of the substrate may include a curved surface at the edge bending portion located on the bottom region 1000B side of the solid-state battery package, and a curved inorganic surface 170b may be provided on this curved surface. Furthermore, as shown in FIG. 11, the covering inorganic layer 170 may extend from the covering insulating layer 170 to the second main surface 200B of the substrate. This structure relatively increases the bonding area between the substrate 200 and the exterior part 150, making peeling of the exterior part 150 less likely to occur. Furthermore, covering the boundary between the substrate 200 and the covering insulating layer 160 with the covering inorganic layer 170 may more effectively prevent water vapor from penetrating from the outside into the solid-state battery 100 and may also make it possible to protect the edge bending portion of the substrate.

[0079] 5 and 6, coated inorganic layer 170 included in exterior part 150 may have a structure consisting of two or more layers. In other words, coated inorganic layer 170 provided on coated insulating layer 160 may be a composite inorganic film in which two or more inorganic layers are stacked.

[0080] In one embodiment, the coating inorganic layer 170 may include a dry-plated film 171 and a wet-plated film 172. That is, a composite inorganic film composed of the dry-plated film 171 and the wet-plated film 172 may be provided on the coating insulating layer 160. The dry-plated film 171 may be, for example, a sputtered film. That is, the solid-state battery package of the present invention may be provided with a sputtered thin film as the dry-plated film. A sputtered film is a thin film obtained by sputtering. That is, a film obtained by sputtering ions onto a target to eject the atoms and depositing the film can be used as the dry-plated film.

[0081] The sputtered film has a very thin morphology on the nano- or micro-order, yet is a relatively dense and / or uniform layer, which can contribute to preventing water vapor permeation into solid-state batteries. Furthermore, because the sputtered film is formed by atomic deposition, it can adhere more favorably to the target. Therefore, the sputtered film can be more favorably used as a barrier to prevent water vapor from the external environment from penetrating into solid-state batteries. Therefore, by including a sputtered film as a dry-plated film in the coating inorganic layer, it is possible to further improve the ability to prevent water vapor from permeating into solid-state batteries. The dry-plated film may also be formed by other dry plating methods, such as vacuum deposition or ion plating. In a preferred embodiment, the dry-plated film may include at least one selected from the group consisting of Al (aluminum), Cu (copper), Ti (titanium), and stainless steel (SUS).

[0082] The wet-plated film 172 may be a single layer, or may have a multi-layer structure of two or more layers as shown in FIG. 6 . In a preferred embodiment, the coated inorganic layer 170 includes a dry-plated film 171 and multiple wet-plated films 172 (172a-172c), with the dry-plated film 171 and the multiple wet-plated films 172a-172c stacked on the coated insulating layer 160. While FIG. 6 illustrates an embodiment including three wet-plated films as an example, this is not limiting. For example, two, three, or four wet-plated films may be formed. In other words, the coated inorganic layer 170 may be a composite inorganic film having a multi-layer structure of three or more layers including dry-plated films and wet-plated films. By providing multiple wet-plated films 172 on the dry-plated film 171, the coated inorganic layer 170 can more effectively function as a barrier to prevent water vapor from penetrating from the outside into the solid-state battery.

[0083] By way of example only, the wet-plated film may include, for example, plating of one metal selected from the group consisting of Cu (copper), Ni (nickel), Sn (tin), Pb (lead), Au (gold), Ag (silver), Pd (palladium), Bi (bismuth), Cr (chromium) and Zn (zinc), or an alloy containing at least one metal from said group.

[0084] The wet-plated films 172a-172c may each be a different type of metal plating film. Alternatively, two types of metal plating films may be alternately formed. In one embodiment, the composite inorganic film includes a plating film with relatively high ductility and a plating film with corrosion resistance. By stacking plating films with different properties in this way, the composite inorganic film can be stress-relieved by the highly ductile plating film, and mechanical deterioration of the composite inorganic film due to the influence of the external environment can be suppressed by the corrosion-resistant plating film. For example, the coated inorganic layer may be a multilayer film in which a relatively highly ductile wet-plated film containing Cu as a primary component and a relatively highly corrosion-resistant wet-plated film containing Ni as a primary component are stacked in any order on a dry-plated film.

[0085] As described above, when the coated inorganic layer 170 is a composite inorganic film including two or more inorganic films, each of the inorganic films may be curved outward on the outer curved surface of the exterior part 150. That is, in a cross-sectional view, two or more inorganic films curved outward on the outer curved surface may be stacked. In such a configuration, the cross-sectional shapes of the inorganic films included in the composite inorganic film may be similar to each other. In this way, by providing the solid-state battery package with two or more inorganic films curved outward at the bent edge portion, external mechanical stress is diffused by the curved surfaces of each inorganic film. Therefore, it is possible to more effectively prevent external mechanical stress from concentrating on the bent edge portion, and the mechanical stress resistance of the solid-state battery package may be further improved.

[0086] The larger the radius of curvature of the outer curved surface, the more effectively stress concentration at the bent edge portion can be alleviated. On the other hand, if the radius of curvature is large, the thickness of the exterior part at the bent edge portion becomes relatively thin, which may result in a poorer water vapor barrier function. When prioritizing both alleviation of stress concentration and ensuring water vapor barrier properties, the radius of curvature of the outer curved surface in cross-section is preferably 35 μm to 250 μm, more preferably 40 μm to 200 μm, and even more preferably 50 μm to 175 μm. By setting the radius of curvature within the above range, a solid-state battery package can be obtained in which the concentration of external mechanical stress at the bent edge portion of the exterior part is suitably suppressed.

[0087] In this specification, the term "radius of curvature" refers to the radius of a circle obtained by approximating a portion of a curve included in the outer curved surface of the outermost surface of the exterior part 150 as an arc in a cross-sectional view. In other words, the term "radius of curvature" refers to the radius of the arc in the shape of the outermost edge (i.e., the outermost contour) of the outer curved surface in a cross-sectional view. For example, the radius of curvature can be calculated using a known mathematical method from three points on the curve included in the outermost edge of the outer curved surface in a cross-sectional view shown in FIG. 4: the start point 181 and end point 182 of the curve, and the bending center point 183 located midway between the start point and end point. As shown in FIG. 4, when the exterior part 150 has the coated inorganic film 170 as the outermost layer, the radius of curvature of the outer curved surface corresponds to the radius of curvature R1 (see FIG. 4) of the curved inorganic surface that defines the outermost edge of the exterior part 150.

[0088] The structure of the solid-state battery package in this specification may be observed from an image obtained by cutting a cross section in the cross-sectional viewing direction using an ion milling machine (manufactured by Hitachi High-Tech Corporation, model number SU-8040) and acquiring the image using a microscope (manufactured by Keyence Corporation, model number VHX-6000). Furthermore, the radius of curvature R and thickness dimension, etc., referred to in this specification may refer to values ​​calculated from dimensions measured from the image acquired by the above-mentioned method.

[0089] The radius of curvature of the outer curved surface at the corners may be different from the radius of curvature of the outer curved surface at the ridges. In one embodiment, the radius of curvature of the outer curved surface at the corners is greater than the radius of curvature of the outer curved surface at the ridges. In such an embodiment, the curved inorganic surfaces and curved insulating surfaces located at top-side corners 151a and bottom-side corners 151b may each have a greater radius of curvature than the curved inorganic surfaces and curved insulating surfaces at top-side ridges 152a, bottom-side ridges 152b, and bottom-side ridges 152c (see FIG. 1).

[0090] The corners are more susceptible to stress concentration than the ridges, and are more susceptible to breakage due to external mechanical stress. As described above, by providing the corners with outer curved surfaces having a larger radius of curvature than the ridges, stress concentration at the corners can be more effectively alleviated, and breakage of the exterior part at the corners can be more effectively prevented.

[0091] In one embodiment, the radii of curvature R1 and R2 of the outer curved surfaces of the coated insulating layer 160 and the coated inorganic layer 170 may be the same or different (see FIG. 4). For example, the curved insulating surface 160a of the coated insulating layer and the curved inorganic surface 170a disposed thereon may have different radii of curvature. In a preferred embodiment, the radius of curvature R1 of the curved inorganic surface may be greater than the radius of curvature R2 of the curved insulating surface located inside it. By appropriately setting the outermost curved inorganic surface 170a to have a larger radius of curvature, the coated inorganic layer 170 may have a constant thickness in cross-section. That is, the coated inorganic layer 170 may be disposed on the coated insulating layer 160 with a constant thickness in cross-section. This means that the coated inorganic layer 170 is disposed in a band shape of a constant width on the coated insulating layer 160 at the edge bend portion. This configuration prevents the coated inorganic layer 170 from being partially thin at the edge bend portion. Therefore, a solid-state battery package can be provided that can more suitably prevent damage to the inorganic coating layer due to external mechanical stress.

[0092] In a cross-sectional view, the radius of curvature of the outer curved surface at the corner (corresponding to the radius of curvature Ra of the curved inorganic surface) is preferably 120 μm to 250 μm, more preferably 130 μm to 240 μm, and even more preferably 140 μm to 230 μm. By setting the radius of curvature of the corner within the above range, a solid-state battery package can be obtained in which the concentration of external mechanical stress is suitably suppressed.

[0093] In addition, in a cross-sectional view, the radius of curvature of the outer curved surface at the ridge line portion (corresponding to the radius of curvature Ra of the curved inorganic surface) is preferably 80 μm to 200 μm, more preferably 85 μm to 180 μm, and even more preferably 90 μm to 150 μm. By setting the radius of curvature of the ridge line portion within the above range, a solid-state battery package can be obtained in which the concentration of external mechanical stress is suitably suppressed.

[0094] Furthermore, in a cross-sectional view, the radius of curvature R2 of the curved insulating surface located inside the curved inorganic surface at the corner is preferably 45 μm to 150 μm, more preferably 50 μm to 140 μm, and even more preferably 55 μm to 130 μm. By setting the radius of curvature of the curved insulating surface at the corner within the above range, a solid-state battery package can be obtained in which the concentration of external mechanical stress is suitably suppressed.

[0095] In addition, in a cross-sectional view, the radius of curvature R2 of the curved insulating surface located inside the curved inorganic surface at the ridge line portion is preferably 35 μm to 120 μm, more preferably 40 μm to 100 μm, and even more preferably 45 μm to 80 μm. By setting the radius of curvature of the curved insulating surface at the ridge line portion within the above range, a solid-state battery package can be obtained in which the concentration of external mechanical stress is suitably suppressed.

[0096] In one embodiment, the bent edge portion of the exterior part 150 located on the top region 1000A side of the solid-state battery package may include an outer curved surface having a different radius of curvature from the bent edge portion located on the bottom region 1000B side. For example, the radius of curvature Ra of the outer curved surface at the top corner 151a may be larger than the radius of curvature Rb of the outer curved surface at the bottom corner 151b (see FIGS. 7 and 8 ). The top region 1000A of the solid-state battery package may be exposed to the outside even after the solid-state battery package is mounted, and therefore may be relatively susceptible to mechanical stress such as contact with other components. The bent edge portion located on the top region 1000A side of the solid-state battery package preferably includes an outer curved surface with a larger radius of curvature to prevent concentration of external mechanical stress. On the other hand, by making the radius of curvature of the outer curved surface of the bent edge portion located on the bottom region side smaller than that on the top region side, the contact area between the mounting substrate and the solid-state battery package can be increased, thereby strengthening the connection between the solid-state battery package and the mounting substrate.

[0097] [Solid-state battery package manufacturing method] The object of the present invention can be obtained by preparing a solid-state battery including a battery building block having a positive electrode layer, a negative electrode layer, and a solid electrolyte between the electrodes, and then packaging the solid-state battery.

[0098] The production of the solid state battery of the present invention can be broadly divided into the production of the solid state battery itself (hereinafter also referred to as "pre-packaged battery"), which corresponds to a stage before packaging, the preparation of the substrate, and packaging.

[0099] <Manufacturing method of unpackaged batteries> The pre-packaged battery can be manufactured by a printing method such as screen printing, a green sheet method using a green sheet, or a combination of these methods. That is, the pre-packaged battery itself may be manufactured in accordance with a conventional method for manufacturing solid-state batteries (therefore, raw materials such as the solid electrolyte, organic binder, solvent, optional additives, positive electrode active material, and negative electrode active material described below may be those used in the manufacture of known solid-state batteries).

[0100] In the following, one production method will be described as an example for better understanding of the present invention, but the present invention is not limited to this method. Furthermore, the order of the following description and other chronological matters are merely for the convenience of explanation and are not necessarily binding.

[0101] (Laminated block formation) A solid electrolyte, an organic binder, a solvent, and optional additives are mixed to prepare a slurry, which is then fired to form a sheet containing the solid electrolyte. A paste for a positive electrode is prepared by mixing a positive electrode active material, a solid electrolyte, a conductive material, an organic binder, a solvent, and any additives. Similarly, a paste for a negative electrode is prepared by mixing a negative electrode active material, a solid electrolyte, a conductive material, an organic binder, a solvent, and any additives. Print the positive electrode paste onto the sheet, and if necessary, print the current collecting layer and / or negative layer. Similarly, print the negative electrode paste onto the sheet, and if necessary, print the current collecting layer and / or negative layer. A laminate is obtained by alternately stacking sheets printed with a positive electrode paste and sheets printed with a negative electrode paste. The outermost layer (top layer and / or bottom layer) of the laminate may be an electrolyte layer, an insulating layer, or an electrode layer.

[0102] (Battery firing body formation) After the laminate is pressure-bonded and integrated, it is cut to a predetermined size. The cut laminate is then degreased and fired to obtain a fired laminate. Note that the laminate may be degreased and fired before cutting, and then cut.

[0103] (Edge electrode formation) The positive electrode end electrode can be formed by applying a conductive paste to the exposed positive electrode side of the fired laminate. Similarly, the negative electrode end electrode can be formed by applying a conductive paste to the exposed negative electrode side of the fired laminate. The positive and negative electrode end electrodes may be provided so as to extend to the main surfaces of the fired laminate. The component of the end electrode can be at least one selected from silver, gold, platinum, aluminum, copper, tin, and nickel.

[0104] The end electrodes on the positive and negative electrodes do not necessarily have to be formed after firing of the laminate, but may be formed before firing and then subjected to simultaneous firing.

[0105] By going through the steps described above, a desired pre-packaged battery (corresponding to the solid-state battery 100 shown in FIG. 12A) can finally be obtained.

[0106] <Preparation of substrate> In this step, the substrate is prepared.

[0107] Although not particularly limited, when a resin substrate is used as the substrate, its preparation may be carried out by stacking multiple layers and then heating and pressurizing them. For example, a substrate precursor is formed using a resin sheet composed of a base fiber cloth impregnated with a resin raw material. After the substrate precursor is formed, this substrate precursor is subjected to heating and pressure in a press. On the other hand, when a ceramic substrate is used as the substrate, its preparation may be carried out, for example, by thermocompression bonding multiple green sheets to form a green sheet laminate and then firing the green sheet laminate to obtain a ceramic substrate. The ceramic substrate may be prepared, for example, in accordance with the preparation of an LTCC substrate. A semi-lacquer substrate may have vias and / or lands. In such cases, for example, holes may be formed in the green sheets using a punch press or a carbon dioxide laser, and the holes may be filled with a conductive paste material, or precursors of conductive portions such as vias and lands may be formed by a printing method or the like. Note that lands, etc., may also be formed after firing the green sheet laminate.

[0108] By going through the above steps, the desired substrate 200 can finally be obtained.

[0109] Packaging Next, the battery and substrate obtained above are packaged (see FIGS. 12B to 12E).

[0110] First, the pre-packaged battery 100 is placed on the substrate 200 (see FIG. 12B). In other words, an "unpackaged solid-state battery" is placed on the substrate (hereinafter, a battery used for packaging will also be simply referred to as a "solid-state battery").

[0111] Preferably, the solid-state battery 100 is placed on the substrate so that the conductive portions of the substrate and the end electrodes of the solid-state battery 100 are electrically connected to each other. For example, a conductive paste may be applied to the substrate, thereby electrically connecting the conductive portions of the substrate and the end electrodes of the solid-state battery 100 to each other. More specifically, the conductive portions (particularly the lower land / bottom land) on the positive and negative sides of the main surface of the substrate are aligned with the positive and negative end electrodes of the solid-state battery 100, respectively, and then bonded using a conductive paste (e.g., Ag conductive paste). In other words, a precursor of a bonding member that provides electrical connection between the solid-state battery 100 and the substrate may be provided in advance.

[0112] The precursor of such a joining member can be provided by printing a conductive paste that does not require washing with flux or the like after formation, such as Ag conductive paste, nanopaste, alloy paste, brazing material, etc. Next, the solid-state battery 100 is placed on the substrate so that the end surface electrodes of the solid-state battery and the precursor of the joining member are in contact with each other, and by subjecting the precursor to a heat treatment, a joining member that contributes to electrical connection between the solid-state battery 100 and the substrate is formed from the precursor.

[0113] Next, the exterior part 150 is formed. The exterior part includes a coating insulating layer 160 and a coating inorganic layer 170.

[0114] First, the covering insulating layer 160 is formed to cover the solid-state battery 100 on the substrate 200 (see FIG. 12C ). Therefore, a raw material for the covering insulating layer is provided so as to completely cover the solid-state battery 100 on the substrate. When the covering insulating layer is made of a resin material, a resin precursor is applied to the substrate and cured to form the covering insulating layer. In a preferred embodiment, the covering insulating layer may be formed by applying pressure using a mold. As a mere example, the covering insulating layer that seals the solid-state battery 100 on the substrate may be formed using a compression mold. If the covering insulating layer is made of a resin material commonly used in molding, the raw material for the covering insulating layer may be in the form of granules, and may be thermoplastic. Note that such forming is not limited to mold forming, but may also be performed using polishing, laser processing, and / or chemical treatment.

[0115] After forming the covering insulating layer 160, the corners and / or ridges of the covering insulating layer 160 and / or the substrate 200 are rounded to form the outer curved surface 180 (see FIG. 12D). Specifically, a process for forming the outer curved surface is carried out on the "covering precursor in which the individual solid-state batteries 100 are covered with the covering insulating layer 160 on the substrate 200." While merely exemplary, processing methods include a variety of means, including barrel grinding and sandblasting. Such processing is preferably carried out using an organic solvent. A cleaning step may also be included after processing.

[0116] For example, the coating precursor after forming the insulating layer 160 may be enclosed in a barrel together with grinding media and an organic solvent that are harder than the insulating layer 160 and / or the substrate 200, and polished by rotating the barrel. By way of example only, the grinding media used in such a grinding process may include alumina powder and / or alumina balls. In a preferred embodiment, the coating precursor, along with the grinding media and the organic solvent, may be placed in a barrel container and rotated at approximately 100 RPM for approximately 10 hours. This barrel polishing results in a curved surface in the insulating layer 160 and / or the substrate 200 located at the bent edge of the solid-state battery package. The barrel-polished coating precursor may then be ultrasonically cleaned using an organic cleaning solvent and then dried.

[0117] After the outer curved surface is formed, the coated inorganic layer 170 is formed (see FIG. 12E). The coated inorganic layer 170 may be formed by plating the coated precursor. This allows the coated inorganic layer 170 to be formed to follow the outer shape of the coated insulating layer 160. In other words, the coated inorganic layer 170 formed by plating has a shape that includes a curved surface that follows the outer contour of the curved surface of the coated insulating layer 160 and / or substrate 200 formed by barrel polishing or the like. In one embodiment, a composite inorganic film is formed on the coated precursor by forming multiple wet-plated films on exposed surfaces other than the bottom surface of the coated precursor (i.e., other than the bottom surface of the substrate).

[0118] The wet-plated composite layer may be formed by laminating multiple wet-plated films by performing wet plating processes having different properties in a predetermined order. For example, in one embodiment of the present invention, multiple types of wet plating processes are sequentially performed on the coated precursor, and a first wet-plated film and a second wet-plated film are laminated in this order.

[0119] Wet plating can be performed by, for example, electroplating or electroless plating. When the film formation speed of plating is important, it is more preferable to form a wet plated film by electroplating. Therefore, in one embodiment of the present invention, the wet plated film can be formed by electroplating, and the wet plated film can also be referred to as an electroplated film.

[0120] Furthermore, dry plating and wet plating may be combined to form the coated inorganic layer. For example, a dry-plated film may first be formed by dry plating the coated precursor. More specifically, a dry-plated film may be formed on an exposed surface other than the bottom surface of the coated precursor (i.e., other than the bottom surface of the support substrate) by dry plating. Next, a wet-plated composite layer may be formed on the dry-plated film by performing multiple types of wet plating in a predetermined order on the coated precursor on which the dry-plated film has been formed.

[0121] By going through the above steps, the solid-state battery on the substrate is entirely covered with the insulating coating layer and the inorganic coating layer, and a packaged product having an outer curved surface at the edge bending portion can be obtained, i.e., the "solid-state battery package" according to the present invention can be finally obtained.

[0122] The water vapor barrier layer may be formed on the substrate in advance, that is, before packaging in which the substrate and the solid-state battery are combined.

[0123] There are no particular limitations on the water vapor barrier layer, as long as it can form the desired barrier layer. For example, a "water vapor barrier layer having Si-O bonds and Si-N bonds" is preferably formed by applying a liquid precursor and irradiating it with ultraviolet light. In other words, the water vapor barrier layer is formed under relatively low temperature conditions (for example, a temperature condition of about 100°C) without using a vapor phase deposition method such as CVD or PVD.

[0124] Specifically, a liquid precursor containing, for example, silazane is prepared, and the liquid precursor is applied to a substrate by spin coating or spray coating, and then dried to form a barrier precursor. The barrier precursor is then exposed to UV light in a nitrogen-containing atmosphere, resulting in a water vapor barrier layer having Si-O and Si-N bonds.

[0125] It is preferable to locally remove the water vapor barrier layer at the joining portion between the conductive portion of the substrate and the end electrode of the solid-state battery so that the water vapor barrier layer is not present at that portion. Alternatively, a mask may be used to prevent the water vapor barrier layer from being formed at the joining portion. That is, a mask may be applied to the joining portion, and the water vapor barrier layer may be formed overall, and then the mask may be removed. [Example]

[0126] A demonstration test was carried out in accordance with the present invention. The structure of the solid-state battery package shown in Figure 7 was adopted.

[0127] Specifically, solid-state battery packages of Examples 1 to 4 shown in Table 1 below were manufactured. Specifically, the coated precursor covered with the insulating coating layer was placed in a barrel container and rotated at a predetermined rotation speed for a predetermined time together with grinding media (alumina powder and alumina balls with a diameter of 3 mm) and an organic solvent. After barrel polishing, the coated precursor was ultrasonically cleaned using an organic cleaning solvent and dried. Thereafter, a coating inorganic layer was formed on the coated precursor by plating, thereby obtaining a solid-state battery package having an outer curved surface at the bent edge portion. Note that as a comparative example, a solid-state battery package that was not subjected to a processing step to form an outer curved surface was used. The curvature radii of the insulating coating layer and the inorganic coating layer at the top corner portion and the top ridge portion of the obtained solid-state battery package are shown in Table 1.

[0128] [Table 1]

[0129] The radius of curvature of each coating layer listed in Table 1 was determined from images of a cross section processed using an ion milling device (Hitachi High-Technologies Corporation, Model No. SU-8040) taken with a microscope (Keyence Corporation, Model No. VHX-6000).

[0130] A test simulating mechanical stress was conducted on the solid-state batteries of the Comparative Example and the Example. The test was conducted by placing 100 solid-state battery packages of each Example and Comparative Example in separate barrel containers and rotating them at 10 RPM for 1 hour, causing the solid-state battery packages to collide with each other. The solid-state battery packages were then removed from the barrel container and observed under a 30x microscope to determine whether or not there were cracks in the outermost coating inorganic layer.

[0131] Furthermore, a test was conducted to evaluate the water vapor penetration resistance of the exterior of the solid-state battery package after the mechanical stress test. Specifically, a charge-discharge test was conducted on the solid-state battery package after 500 hours of storage in a high-temperature, high-humidity environment at a temperature of 85°C and a relative humidity of 85%. In the charge-discharge test, the solid-state battery packages of the comparative example and each example were charged at a constant current of 10 mA at 25°C until they reached 4.2 V, and then charged at a constant voltage of 1 mA after reaching 4.2 V. They were then discharged at a constant current of 10 mA and a cutoff voltage of 2 V at 25°C. A total of 30 charge-discharge cycles were performed, with the above cycle counting as one cycle. Based on the above test, a charge-discharge efficiency ((discharge capacity) / (charge capacity) × 100 [%]) of the solid-state battery at the 30th cycle was evaluated as good if it was 90% or higher, and as poor if it was less than 90%. The results of each test are shown in Table 2.

[0132] [Table 2]

[0133] According to the above results, the solid-state battery packages of Examples 1 to 4 have a structure including an outer curved surface at the edge bend, and therefore cracks in the exterior part after the mechanical stress test were reduced. On the other hand, the solid-state battery package of the comparative example does not include an outer curved surface, and cracks were found in about 30% of the solid-state battery packages after the mechanical stress test. In other words, by including an outer curved surface at the edge bend of the exterior part, the occurrence of cracks in the exterior part due to external mechanical stress was reduced.

[0134] Furthermore, according to the results of charge / discharge tests, the solid-state battery packages of Examples 1 to 4 did not show any deterioration in the battery performance of the solid-state batteries even in a high-temperature, high-humidity environment, indicating that the water vapor penetration prevention function of the exterior part was working properly. On the other hand, in the solid-state battery package of Comparative Example, the battery performance was reduced in the solid-state battery package that had developed cracks, confirming that the water vapor penetration prevention function of the exterior part was impaired by mechanical stress. Therefore, the present invention provides a more reliable solid-state battery package with improved resistance to external mechanical stress.

[0135] Although the embodiments of the present invention have been described above, they are merely typical examples. Those skilled in the art will readily understand that the present invention is not limited to these, and that various modifications are possible within the scope of the present invention.

[0136] It should be noted that the embodiment of the present disclosure as described above includes the following preferred aspects. First aspect: a substrate; a solid-state battery provided on the substrate; and an exterior covering the solid-state battery; The exterior part has a plurality of corner parts, and at least a top surface side corner part of the plurality of corner parts includes an outer curved surface that is curved outward. Second aspect: In the first aspect, the top surface side corner portion is provided in plurality, a top ridge portion connecting an adjacent first top corner portion and an adjacent second top corner portion among the plurality of top corner portions includes an outer curved surface. Third aspect: In the second aspect, the top surface side ridge portion extends in different directions from each other and is a boundary portion between adjacent first and second surface regions, The outer curved surface of the top edge extends from a first surface area to a second surface area. Fourth aspect: In any one of the first to third aspects, the exterior portion includes a bottom corner portion that covers the substrate, The solid-state battery package, wherein the bottom corner portion includes an outer curved surface. Fifth aspect: In any one of the first to fourth aspects, the exterior portion includes a plurality of bottom side corner portions that cover the substrate, The solid-state battery package, wherein a bottom edge portion connecting an adjacent first bottom corner portion and a second bottom corner portion among the plurality of bottom corner portions includes an outer curved surface. Sixth aspect: In any one of the first to fifth aspects, the exterior portion includes a bottom corner portion that covers the substrate, a side edge portion connecting the adjacent top corner portion and the adjacent bottom corner portion includes an outer curved surface. Seventh aspect: In any one of the first to seventh aspects, the solid-state battery package has a radius of curvature of the outer curved surface of 35 μm or more and 250 μm or less. Eighth aspect: In any one of the first to seventh aspects, the exterior portion includes a coated insulating layer that covers at least a top surface and a side surface of the solid-state battery provided on the substrate, and a coated inorganic layer provided on the coated insulating layer, At the outer curved surface, at least the coated inorganic layer includes an outwardly curved curved inorganic surface. Ninth aspect: In the eighth aspect, in a cross-sectional view, the covering insulating layer located inside the curved inorganic surface includes a curved insulating surface that is curved outward. Tenth aspect: In the ninth aspect, in a cross-sectional view, the radius of curvature of the curved inorganic surface is larger than the radius of curvature of the curved insulating surface. Eleventh aspect: In any one of the eighth to tenth aspects, the solid-state battery package has a curvature radius of the curved inorganic surface at the top-side corner portion of 120 μm or more and 250 μm or less in cross section. 12th aspect: In the ninth aspect, and in any of the tenth and eleventh aspects based on the ninth aspect, the curved insulating surface at the top corner portion has a radius of curvature of 45 μm or more and 150 μm or less in cross section. Thirteenth aspect: In any one of the eighth to twelfth aspects, a top-side ridge portion connecting the adjacent top-side corner portions includes a curved inorganic surface that is curved outward, A solid-state battery package, wherein a radius of curvature of the curved inorganic surface at the top corner portion is greater than a radius of curvature of the curved inorganic surface at the top edge portion. Fourteenth aspect: In the thirteenth aspect, in the solid-state battery package, the radius of curvature of the curved inorganic surface of the top surface side ridge line portion is 80 μm or more and 200 μm or less. Fifteenth aspect: In the thirteenth or fourteenth aspect, in a cross-sectional view, the covering insulating layer located inside the curved inorganic surface at the top surface side ridge line portion includes a curved insulating surface that is curved outward, a radius of curvature of the curved insulating surface at the top corner portion is greater than a radius of curvature of the curved insulating surface at the top ridge portion. Sixteenth aspect: In any one of the thirteenth to fifteenth aspects, in a cross-sectional view, the covering insulating layer located inside the curved inorganic surface at the top surface side ridge line portion includes a curved insulating surface that is curved outward, The curved insulating surface at the top edge portion has a radius of curvature of 35 μm or more and 120 μm or less. Seventeenth aspect: In any one of the eighth to sixteenth aspects, the substrate has a first main surface facing the solid-state battery and a second main surface located on the opposite side of the first main surface, the coating inorganic layer extends to the second main surface, A solid-state battery package, wherein, in a cross-sectional view, the substrate located inside the curved inorganic surface is curved outward. 18th aspect: In any one of the eighth to seventeenth aspects, the coated inorganic layer is a composite inorganic film in which two or more inorganic films are laminated, A solid-state battery package, wherein, in a cross-sectional view, each of the two or more inorganic films is curved outward at the outer curved surface. 19th aspect: In the fourth aspect and any one of the fifth to eighteenth aspects based on the fourth aspect, the solid-state battery package is characterized in that, in a cross-sectional view, a radius of curvature of the outer curved surface at the top corner portion is different from a radius of curvature of the outer curved surface at the bottom corner portion. 20th aspect: In the fourth aspect and any one of the fifth to nineteenth aspects based on the fourth aspect, the solid-state battery package has, in cross-sectional view, a larger radius of curvature of the outer curved surface at the top corner portion than that of the outer curved surface at the bottom corner portion. 21st aspect: In any one of the first to twentieth aspects, the solid-state battery package has a rectangular cross-sectional shape, and a plurality of corners of an exterior covering the solid-state battery each include an outer curved surface. [Industrial Applicability]

[0137] The solid-state battery package of the present invention can be used in a variety of fields where battery use or power storage is envisioned. By way of example only, the solid-state battery package of the present invention can be used in the fields of electricity, information, and communications where mobile devices are used (e.g., the fields of electrical and electronic equipment or mobile devices including mobile phones, smartphones, laptop computers, digital cameras, activity monitors, arm computers, electronic paper, and small electronic devices such as RFID tags, card-type electronic money, and smart watches), household and small industrial applications (e.g., power tools, golf carts, and household, nursing care, and industrial robots), large industrial applications (e.g., forklifts, elevators, and harbor cranes), transportation systems (e.g., hybrid cars, electric cars, buses, trains, electrically assisted bicycles, and electric motorcycles), power system applications (e.g., various power generation systems, road conditioners, smart grids, and general household-installed power storage systems), medical applications (e.g., medical devices such as earphones and hearing aids), pharmaceutical applications (e.g., medication management systems), IoT, and space and deep-sea applications (e.g., space probes, submersible research vessels, and the like). [Explanation of symbols]

[0138] 100 solid state battery First main surface of 100A solid-state battery 100B Second main surface of solid-state battery 110 Positive electrode layer 120 negative electrode layer 130 Solid electrolyte or solid electrolyte layer 140 End electrode 140A Positive end electrode 140B Negative electrode end surface 150 Exterior part 151 Corner section 151a Top surface corner 151b Bottom corner 152 Ridge 152a Top side ridgeline 152b Bottom ridge 152c Side ridge 160 Insulating coating layer 160a curved insulating surface 170 Inorganic coating layer 170a Curved inorganic surface 171 Dry plating film 172 Wet plating film 180 Outer curved surface 200 boards 200A First main surface of the board 200B Second main surface of substrate 210 Substrate electrode layer (upper side of substrate) 210A Positive side substrate electrode layer 210B Negative electrode layer of substrate 220 Mounting side board electrode layer (bottom side of board) 220A Positive side mounting side board electrode layer 220B Negative side mounting side substrate electrode layer 600 Joint materials 1000 solid state battery packages 1000A top area 1000B Bottom area 1000C side area

Claims

1. a substrate, a solid-state battery provided on the substrate, and an exterior part covering the solid-state battery; the exterior portion has a plurality of corner portions, and at least one of the plurality of corner portions has an outer curved surface that is curved outward, A solid-state battery package, wherein, in a cross-sectional view, the radius of curvature of the outer curved surface at the outermost surface of the exterior part is 120 μm or more and 250 μm or less.

2. The top surface side corner portions are provided in plural, The solid-state battery package according to claim 1 , wherein a top edge connecting a first top corner and a second top corner, among the plurality of top corners, includes an outer curved surface.

3. the top surface side ridge portion extends in different directions from each other and is a boundary portion between adjacent first and second surface regions, 3. The solid-state battery package according to claim 2, wherein the outer curved surface of the top edge portion extends from a first surface area to a second surface area.

4. the exterior portion includes a bottom corner portion that covers the substrate, The solid-state battery package according to claim 1 , wherein the bottom corner portion includes an outer curved surface.

5. the exterior portion includes a plurality of bottom side corner portions that cover the substrate, The solid-state battery package according to claim 1 , wherein a bottom edge portion connecting an adjacent first bottom corner portion and a second bottom corner portion of the plurality of bottom corner portions includes an outer curved surface.

6. the exterior portion includes a bottom corner portion that covers the substrate, The solid-state battery package according to claim 1 , wherein a side edge portion connecting the adjacent top corner portion and bottom corner portion includes an outer curved surface.

7. the exterior portion includes a coating insulating layer that covers at least a top surface and a side surface of the solid-state battery provided on the substrate, and a coating inorganic layer provided on the coating insulating layer, 7. The solid-state battery package according to claim 1, wherein at least the coated inorganic layer includes an inorganic surface that is curved outward on the outer curved surface.

8. The solid-state battery package according to claim 7 , wherein the covering insulating layer located inside the curved inorganic surface in a cross-sectional view includes a curved insulating surface that curves outward.

9. The solid-state battery package according to claim 8 , wherein, in a cross-sectional view, the radius of curvature of the curved inorganic surface is greater than the radius of curvature of the curved insulating surface.

10. The solid-state battery package according to claim 7 , wherein the curved inorganic surface at the top corner portion has a radius of curvature of 120 μm or more and 250 μm or less in a cross-sectional view.

11. 9. The solid-state battery package according to claim 8, wherein the curved insulating surface at the top-side corner portion has a radius of curvature of 45 μm or more and 150 μm or less in a cross-sectional view.

12. a top-side ridge portion connecting the adjacent top-side corner portions includes a curved inorganic surface that is curved outward; The solid-state battery package according to claim 7 , wherein a radius of curvature of the curved inorganic surface at the top corner portion is greater than a radius of curvature of the curved inorganic surface at the top edge portion.

13. The solid-state battery package according to claim 12 , wherein the radius of curvature of the curved inorganic surface of the top-side ridge line portion is 80 μm or more and 200 μm or less.

14. When viewed in cross section, the covering insulating layer located inside the curved inorganic surface at the top surface side ridge line portion includes a curved insulating surface that is curved outward, The solid-state battery package according to claim 12 , wherein a radius of curvature of the curved insulating surface at the top corner portion is greater than a radius of curvature of the curved insulating surface at the top ridge portion.

15. When viewed in cross section, the covering insulating layer located inside the curved inorganic surface at the top surface side ridge line portion includes a curved insulating surface that is curved outward, The solid-state battery package according to claim 12 , wherein the radius of curvature of the curved insulating surface at the top-side ridge line portion is 35 μm or more and 120 μm or less.

16. the substrate has a first main surface facing the solid-state battery and a second main surface located opposite to the first main surface, the coating inorganic layer extends to the second main surface, The solid-state battery package according to claim 7 , wherein the substrate located inside the curved inorganic surface is curved outward in a cross-sectional view.

17. the substrate includes a ridge portion connecting the first main surface and the second main surface, The solid-state battery package according to claim 16 , wherein the ridge portion of the substrate is curved outward in a cross-sectional view.

18. The solid-state battery package according to claim 16 , wherein, in a cross-sectional view, the coated inorganic layer is curved along the curved portion of the substrate.

19. the exterior portion covers the substrate and has a bottom corner portion including an outer curved surface; the substrate includes a first main surface facing the solid-state battery, a second main surface located on the opposite side of the first main surface, and a side surface connecting the first main surface and the second main surface, the covering insulating layer and the covering inorganic layer cover the side surface, The solid-state battery package according to claim 7 , wherein the covering insulating layer and the covering inorganic layer are curved outward at the bottom corner portions.

20. the coating inorganic layer is a composite inorganic film in which two or more inorganic films are laminated, The solid-state battery package according to claim 7 , wherein each of the two or more inorganic films is curved outward at the outer curved surface in a cross-sectional view.

21. a substrate, a solid-state battery provided on the substrate, and an exterior part covering the solid-state battery; the exterior portion includes a top corner portion and a bottom corner portion, each of the top corner portion and the bottom corner portion includes an outer curved surface that is curved outward; In a cross-sectional view, the radius of curvature of the outer curved surface at the outermost surface of the exterior part is 120 μm or more and 250 μm or less, a substrate located inside the outer curved surface at the bottom corner portion, the substrate being curved outward in a cross-sectional view.

22. 22. The solid-state battery package according to claim 4, wherein, in a cross-sectional view, a radius of curvature of the outer curved surface at the top corner portion is different from a radius of curvature of the outer curved surface at the bottom corner portion.

23. 22. The solid-state battery package according to claim 4 or 21, wherein, in a cross-sectional view, the outer curved surface at the top corner portion has a larger radius of curvature than the outer curved surface at the bottom corner portion.

24. The solid-state battery package according to claim 1 , wherein the solid-state battery has a rectangular shape in cross section, and a plurality of corners of an exterior covering the solid-state battery each include an outer curved surface.

Images