Solid-state battery package and manufacturing method therefor

Abstract

A solid-state battery package comprising a substrate, a solid-state battery provided on the substrate, and a metal exterior body extending from the substrate and covering the solid-state battery with an insulation layer therebetween, wherein the metal exterior body has a joining section where prescribed sections of the metal exterior body are joined together, and the solid-state battery is sealed using the metal exterior body having the joining section.

Description

Solid-state battery package and method of manufacturing same

[0001] The present disclosure relates to solid-state battery packages, particularly solid-state batteries packaged to be conducive to substrate mounting, and methods for manufacturing the same.

[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 on solid-state batteries that use solid electrolytes instead of liquid electrolytes. For example, one example of such a solid-state battery is a solid-state battery that includes a battery element and a laminated exterior body that encapsulates the battery element (Patent Document 1). In the solid-state battery described in Patent Document 1, the laminated exterior body is composed of a laminated core material and a laminated sealing material, and the sealed portion of the laminated exterior body forms a folded portion, and the end face of the folded portion and the laminated exterior body are bonded with a thermosetting resin.

[0005] Another example of a solid-state battery is a solid-state battery that includes a battery stack in which a positive electrode layer, a solid electrolyte layer, and a negative electrode layer are stacked, and a case that houses the battery stack (Patent Document 2). The solid-state battery described in Patent Document 2 has a base that supports the battery stack and a lid that covers the battery stack.

[0006] JP 2015-79719 A International Publication No. 2012 / 081366

[0007] However, as a result of intensive research, the present inventors have found that the solid state batteries described in Patent Documents 1 and 2 still have room for improvement in terms of both sufficiently suppressing the penetration of moisture through the exterior body and improving the battery energy density.

[0008] The present disclosure has been made in view of the above-mentioned problems. That is, a primary object of the present disclosure is to provide a solid-state battery package that can sufficiently suppress moisture penetration and improve battery energy density. Another object of the present disclosure is to provide a method for manufacturing such a solid-state battery package.

[0009] In order to solve the above problems, a solid-state battery package according to one embodiment of the present disclosure includes: a substrate; a solid-state battery provided on the substrate; and a metal exterior body extending from the substrate and covering the solid-state battery via the insulating layer, wherein the metal exterior body has joints that are connected to each other at predetermined locations, and the solid-state battery is sealed by the metal exterior body having the joints.

[0010] Furthermore, a manufacturing method of a solid-state battery package according to another embodiment of the present disclosure is a manufacturing method of the above-mentioned solid-state battery package, in which the metal exterior body has a first exterior body region extending from the substrate and a second exterior body region covering the solid-state battery, and includes overlaying the second exterior body region on the solid-state battery that is mounted on the substrate to which the first exterior body region extends so as to be surrounded by the first exterior body region in a planar view and is covered with the insulating layer, and metal-bonding the interface between the first exterior body region and the second exterior body region to form a joint that seals the solid-state battery.

[0011] A solid-state battery package according to an embodiment of the present disclosure can sufficiently suppress the intrusion of moisture and improve the battery energy density.

[0012] FIG. 1A is a perspective view schematically showing the configuration of a packaged solid-state battery (solid-state battery package) according to the first embodiment of the present disclosure. FIG. 1B is a cross-sectional view (cross-sectional view A-A in FIG. 1 ) schematically showing the configuration of the solid-state battery package according to the first embodiment of the present disclosure. FIG. 1C is a cross-sectional view (cross-sectional view B-B in FIG. 1 ) schematically showing the configuration of the solid-state battery package according to the first embodiment of the present disclosure. FIG. 2 is a cross-sectional view schematically showing the configuration of the solid-state battery package according to the second embodiment of the present disclosure. FIG. 3 is a cross-sectional view schematically showing the configuration of the solid-state battery package according to the third embodiment of the present disclosure. FIG. 4 is a cross-sectional view schematically showing the configuration of the solid-state battery package according to the fourth embodiment of the present disclosure. FIG. 5 is a cross-sectional view schematically showing the configuration of the solid-state battery package according to the sixth embodiment of the present disclosure. FIG. 6 is a cross-sectional view schematically showing the configuration of a solid-state battery package according to another embodiment of the present disclosure. FIG. 7A is a process plan view schematically showing a manufacturing process for the solid-state battery package according to the first embodiment of the present disclosure. FIG. 7B is a process plan view schematically showing a manufacturing process for the solid-state battery package according to the first embodiment of the present disclosure. FIG. 7C is a process plan view schematically showing a manufacturing process of the solid battery package according to the first embodiment of the present disclosure. FIG. 7D is a process plan view schematically showing a manufacturing process of the solid battery package according to the first embodiment of the present disclosure. FIG. 7E is a process plan view schematically showing a manufacturing process of the solid battery package according to the first embodiment of the present disclosure. FIG. 7F is a process plan view schematically showing a manufacturing process of the solid battery package according to the first embodiment of the present disclosure. FIG. 8A is a process plan view schematically showing another aspect of the manufacturing process of the solid battery package according to the modified example of the first embodiment of the present disclosure. FIG. 8B is a process plan view schematically showing another aspect of the manufacturing process of the solid battery package according to the modified example of the first embodiment of the present disclosure. FIG. 8C is a process plan view schematically showing another aspect of the manufacturing process of the solid battery package according to the modified example of the first embodiment of the present disclosure. FIG. 8D is a process plan view schematically showing another aspect of the manufacturing process of the solid battery package according to the modified example of the first embodiment of the present disclosure. FIG. 8E is a process plan view schematically showing another aspect of the manufacturing process of the solid battery package according to the modified example of the first embodiment of the present disclosure.Fig. 8F is a process plan view schematically showing another aspect of the manufacturing process of a solid-state battery package according to a modified example of the first embodiment of the present disclosure. Fig. 9A is a process plan view schematically showing the manufacturing process of a solid-state battery package according to a second embodiment of the present disclosure. Fig. 9B is a process plan view schematically showing the manufacturing process of a solid-state battery package according to the second embodiment of the present disclosure. Fig. 10 is a process plan view schematically showing the manufacturing process of a solid-state battery package according to a third embodiment of the present disclosure.

[0013] Hereinafter, a solid-state battery package according to one aspect of the present disclosure will be described in detail with reference to the drawings as necessary. The drawings include schematic illustrations in part to facilitate understanding of the present disclosure, and may not reflect actual dimensions or proportions.

[0014] The term "cross-sectional view" as used herein refers to a shape viewed from a direction perpendicular to the main surface of the substrate in the solid-state battery package, while the terms "plan view" and "plan view shape" as used herein refer to a sketch of the object viewed from above or below in a direction parallel to the main surface of the substrate.

[0015] The "upper and lower directions" and "lower and upper directions" used directly or indirectly in this specification correspond to the upper and lower directions and the left and right directions in the drawings, respectively. Unless otherwise specified, the same symbols or signs indicate the same members, parts, or the same meanings. In a preferred embodiment, the vertically downward direction (i.e., the direction in which gravity acts) can be considered to correspond to the "lower direction" / "bottom side (lower surface side)," and the opposite direction can be considered to correspond to the "upper direction" / "top side (upper surface side, top surface side)."

[0016] Furthermore, in this specification, "on" a substrate, layer, etc., includes not only cases where it is in contact with the upper surface of the substrate, layer, etc., but also cases where it is not in contact with the upper surface of the substrate, layer, etc. In other words, "on" a substrate, layer, etc., includes cases where a new film or layer is formed above the substrate or layer, and / or cases where another film or layer is interposed between the substrate 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, layer, etc.

[0017] First Embodiment The first embodiment relates to a solid-state battery package. The solid-state battery package according to the first embodiment will be described with reference to FIGS. 1A, 1B, and 1C. FIG. 1A is a perspective view schematically showing the configuration of the solid-state battery package according to the first embodiment. FIG. 1B is a cross-sectional view (cross-sectional view taken along A-A in FIG. 1) schematically showing the configuration of the solid-state battery package according to the first embodiment. FIG. 1C is a cross-sectional view (cross-sectional view taken along B-B in FIG. 1) schematically showing the configuration of the solid-state battery package according to the first embodiment.

[0018] 1A to 1C, the Z direction is the direction in which the solid-state battery 100 is mounted (implemented) on the substrate 200. The X direction is perpendicular to the Z direction and is the long axis direction of the substantially rectangular parallelepiped-shaped solid-state battery 100. The Y direction is perpendicular to the Z direction and the X direction and is the short axis direction of the substantially rectangular parallelepiped-shaped solid-state battery 100. The reverse Z direction is the vertically downward direction, and the forward Z direction is the vertically upward direction. The same applies to the other figures below.

[0019] As shown in FIGS. 1A to 1C, the solid-state battery package 1000 according to the first embodiment includes a substrate 200, a solid-state battery 100 provided on the substrate 200, and a metal exterior body 400 extending from the substrate 200 and covering the solid-state battery 100 via an insulating layer 300, the metal exterior body 400 having joints 430 joined to each other at predetermined locations, and the solid-state battery 100 is sealed by the metal exterior body 400 having the joints 430.

[0020] In this specification, the term "solid-state battery package" refers to a packaged solid-state battery, and in a broad sense, refers to a solid-state battery device configured to protect the solid-state battery from the external environment (outside), and in a narrow sense, refers to a solid-state battery device that includes a mountable substrate and protects the solid-state battery from the outside.

[0021] The solid-state battery package 1000 according to the first embodiment can sufficiently suppress moisture penetration and improve battery energy density. The reason for this is presumed to be as follows, without being bound by any particular theory. In the solid-state battery package 1000, the metal exterior body 400 covers the solid-state battery 100 provided on the substrate 200, and the metal exterior body 400 has a joint 430 where the solid-state battery 100 is joined to the substrate 200 at a predetermined location. The metal exterior body 400 having such a joint 430 seals the solid-state battery 100. In this manner, the solid-state battery 100 is sealed by the metal exterior body 400 without using a joint formed by bonding together resins that are relatively permeable to moisture. This allows for sufficient suppression of moisture penetration. Furthermore, the metal exterior body 400 is flexible, and can therefore follow volumetric changes due to expansion and contraction (expansion and / or contraction) of the solid-state battery 100 during operation. This makes it less likely that damage (e.g., fracture or pinholes) will occur in the metal exterior body 400 due to volumetric changes in the solid-state battery 100, thereby preventing moisture penetration due to damage to the metal exterior body 400. Furthermore, because the metal exterior body 400 covers the solid-state battery 100 via the insulating layer 300, there is no need to provide a space for insulation between the inner surface of the metal exterior body 400 and the outer surface of the solid-state battery 100, and the thickness of the insulating layer 300 can be reduced compared to the space. This makes it possible to improve the battery energy density. From the above, it is believed that the solid-state battery package 1000 according to the first embodiment can sufficiently suppress the penetration of moisture and improve the battery energy density.

[0022] In this specification, "moisture" is not limited to gaseous water (more specifically, water vapor in the atmosphere) but also includes liquid water, such as minute droplets formed by condensation of gaseous water.

[0023] [Motivation for Proposing the Solid-State Battery Package According to the First Embodiment] Moisture penetration into the solid-state battery package 1000 can cause deterioration of battery characteristics. Therefore, effectively suppressing moisture penetration contributes to extending the battery characteristics and life of the solid-state battery 100. The present inventors thoroughly investigated why the solid-state battery described in Patent Document 1 is unable to sufficiently suppress moisture penetration and discovered that the battery uses a joint formed by bonding resins that are relatively permeable to moisture. Furthermore, the present inventors discovered that the solid-state battery expands and contracts during operation, and stress caused by such volumetric changes is applied to the exterior body, which may result in damage to the exterior body. Based on the above technical findings, the present inventors have adopted a metal exterior body 400 made of metal that is both moisture-resistant and flexible (stretchable) enough to accommodate volumetric changes due to expansion and contraction of the solid-state battery 100 during operation.

[0024] On the other hand, improving the battery energy density can improve the volumetric energy density of the solid-state battery. After extensive research, the present inventors discovered that the solid-state battery described in Patent Document 2 has room for improvement in the integration density per unit volume. Specifically, a space is provided to insulate the outer surface of the electrode from the inner surface of the metal exterior body. Based on this technical knowledge, the inventors realized that the space occupied by the insulating layer 300 is smaller than the space, and came to adopt a metal exterior body 400 that covers the solid-state battery 100 via the insulating layer 300 instead of the space.

[0025] The solid-state battery package 1000 has terminals on a first surface 212 and a second surface 214 of the substrate 200. The terminal on the first surface 212 is electrically connected to the solid-state battery 100, and the terminal on the second surface 214 is electrically connected to other components connected to the solid-state battery package 1000. This electrically connects the solid-state battery 100 to the other components.

[0026] Each component of the solid-state battery package 1000 will be described below.

[0027] [Solid-State Battery] The solid-state battery 100 is covered with an insulating layer 300 and further sealed by a metal exterior body 400 having a joint 430 joined (metallicly bonded) at a predetermined location. More specifically, the solid-state battery 100 is sealed by such a metal exterior body 400 and the substrate 200 on which the metal exterior body 400 extends. This prevents the solid-state battery 100 from being exposed to the outside and protects it from the outside. In this way, in the solid-state battery package 1000, the solid-state battery 100 is sealed by the joining of the metal exterior bodies 400 to each other (more specifically, the joining of metal members to each other).

[0028] The solid-state battery 100 is a stacked-type solid-state battery configured such that each layer constituting a battery unit is stacked on top of another, and preferably each such layer is made of a fired body. The solid-state battery 100 has a substantially rectangular parallelepiped-shaped solid-state battery stack 110 and two opposing end electrodes 120 disposed on end faces of the solid-state battery stack 110.

[0029] In this specification, the term "solid-state battery" refers in a broad sense to a battery whose components are made of solids, and in a narrow sense to an all-solid-state battery whose components (particularly preferably all components) are made of solids. Examples of the solid-state battery 100 include so-called secondary batteries (more specifically, storage batteries) that can be repeatedly charged and discharged, and primary batteries that can only be discharged.

[0030] (Solid Electrolyte Layer) The solid battery stack 110 is configured by alternately stacking multiple positive electrode layers 112 and negative electrode layers 114 with solid electrolyte layers 116 interposed therebetween. The positive electrode layer 112, which serves as an electrode layer, is electrically connected to one of the two end surface electrodes 120. The negative electrode layer 114, which serves as an electrode layer, is electrically connected to the other of the two end surface electrodes 120. The solid battery 100 is placed on the substrate 200 so that the stacking direction of the positive electrode layers 112 and the negative electrode layers 114 coincides with the mounting direction of the solid battery 100 on the substrate 200.

[0031] - Electrode Layers: Positive Electrode Layer and Negative Electrode Layer - The positive electrode layer 112 contains at least a positive electrode active material, and may further contain at least one selected from the group consisting of a solid electrolyte, a conductive material, and a sintering aid, and may further include a positive electrode current collecting layer. The negative electrode layer 114 contains at least a negative electrode active material, and may further contain at least one selected from the group consisting of a solid electrolyte, a conductive material, and a sintering aid, and may further include a negative electrode current collecting layer. The material constituting the negative electrode layer 114 may be the same as the material constituting the positive electrode layer 112.

[0032] Active Materials The active materials (positive electrode active material and negative electrode active material) are materials involved in the transfer of electrons in the solid-state battery 100. Carriers (ions, particularly lithium ions or sodium ions) move (conduct) between the positive electrode layer 112 and the negative electrode layer 114 via the solid electrolyte, transferring electrons to charge and discharge the battery. The positive electrode layer 112 and the negative electrode layer 114 (positive electrode layer 112 and negative electrode layer 114) are preferably layers capable of absorbing and releasing lithium ions or sodium ions, in particular. In other words, the solid-state battery 100 is preferably an all-solid-state secondary battery in which lithium ions or sodium ions move between the positive electrode layer 112 and the negative electrode layer 114 via the solid electrolyte layer 116 to charge and discharge the battery.

[0033] Positive Electrode Active Material Positive electrode active materials capable of absorbing and releasing lithium ions include, for example, at least one selected from the group consisting of lithium-containing phosphate compounds having a Nasicon structure, lithium-containing phosphate compounds having an olivine structure, lithium-containing layered oxides, and lithium-containing oxides 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 / 3Examples of lithium-containing oxides having a spinel structure include LiMnO and / or LiNi. 0.5 Mn 1.5 O4, etc. Examples of lithium compounds include, but are not limited to, lithium transition metal composite oxides and lithium transition metal phosphate compounds. Lithium transition metal composite oxides are oxides containing lithium and one or more transition metal elements as constituent elements. Lithium transition metal phosphate compounds are 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 examples include cobalt (Co), nickel (Ni), manganese (Mn), and iron (Fe).

[0034] In addition, as the positive electrode active material capable of absorbing and releasing sodium ions, for example, 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 can be mentioned. ３ V ２ (P.O. ４ ) ３ , NaCoFe ２ (P.O. ４ ) ３ , Na ２ Ni ２ Fe(PO ４ ) ３ , Na ３ Fe ２ (P.O. ４ ) ３ , Na ２ FeP ２ O ７ and Na ４ Fe ３ (P.O. ４ ) ２ (P ２ O ７ ) and NaFeO as a sodium-containing layered oxide ２ At least one selected from the group consisting of:

[0035] Other examples of the positive electrode active material include oxides, disulfides, and conductive polymers. Examples of oxides include titanium oxide, vanadium oxide, and manganese dioxide. Examples of disulfides include titanium disulfide and molybdenum sulfide. Examples of conductive polymers include disulfides, polypyrrole, polyaniline, polythiophene, polyparastyrene, polyacetylene, and polyacene.

[0036] Negative Electrode Active Material Examples of negative electrode active materials capable of absorbing and releasing lithium ions 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.

[0037] In addition, examples of negative electrode active materials capable of absorbing and releasing sodium ions include 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.

[0038] Solid Electrolyte The solid electrolyte that can be included in the electrode layer may be made of the same material as the solid electrolyte included in the solid electrolyte layer 116 described below.

[0039] Conductive Material The conductive material may include at least one conductive material selected from the group consisting of metallic materials such as silver, palladium, gold, platinum, aluminum, copper, and nickel, and carbon.

[0040] Sintering Aid Examples of the sintering aid include at least one selected from the group consisting of lithium oxide, sodium oxide, potassium oxide, boron oxide, silicon oxide, bismuth oxide, and phosphorus oxide.

[0041] Current Collector Layers The current collector layers (positive electrode current collector layer and negative electrode current collector layer) may each have the form of a foil. Here, if it is more important to improve electronic conductivity through co-firing, reduce the manufacturing cost of the solid-state battery 100, and / or reduce the internal resistance of the solid-state battery 100, the current collector layers may have the form of a sintered body. The positive electrode current collector constituting the positive electrode current collector layer and the negative electrode current collector constituting the negative electrode current collector layer are preferably made of a conductive material with high conductivity. Examples of such conductive materials include at least one selected from the group consisting of silver, palladium, gold, platinum, aluminum, copper, and nickel. The current collectors (positive electrode current collector and negative electrode current collector) may have electrical connectors for electrical connection to the outside and may be configured to be electrically connectable to the end electrode 120. When the current collector layers have the form of a sintered body, they may be made of a sintered body containing a conductive material and a sintering aid. The conductive material contained in the current collector layers may be selected from, for example, the same conductive materials that may be contained in the electrode layers. 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 112 and the negative electrode layer 114, respectively.

[0042] The thickness of the positive electrode layer 112 and the negative electrode layer 114 is not particularly limited, but may be, for example, each independently from 2 μm to 200 μm, particularly from 5 μm to 100 μm.

[0043] -Solid Electrolyte Layer- The solid electrolyte layer 116 is interposed between the positive electrode layer 112 and the negative electrode layer 114 and is responsible for carrier conduction between these electrode layers. The solid electrolyte layer 116 may be present around the positive electrode layer 112 and / or the negative electrode layer 114 so as to protrude from between the positive electrode layer 112 and the negative electrode layer 114. The thickness of the solid electrolyte layer 116 is not particularly limited, but is, for example, 1 μm or more and 500 μm or less, particularly 1 μm or more and 200 μm or less. In this specification, the thickness of the solid electrolyte layer 116 refers to the thickness of the solid electrolyte layer 116 disposed between the positive electrode layer 112 and the negative electrode layer 114.

[0044] Solid Electrolyte The solid electrolyte layer 116 includes a solid electrolyte and may further include a sintering aid. The solid electrolyte is a material capable of conducting carriers (e.g., lithium ions or sodium ions). In particular, the solid electrolyte layer 116 constituting a battery structural unit in the solid-state battery 100 may form a layer capable of conducting lithium ions between the positive electrode layer 112 and the negative electrode layer 114. Examples of the solid electrolyte include at least one selected from the group consisting of crystalline solid electrolytes, glass-based solid electrolytes, and glass-ceramic-based solid electrolytes.

[0045] The solid electrolyte capable of conducting lithium ions will be described. Examples of the crystalline solid electrolyte include oxide-based crystalline materials and sulfide-based crystalline materials. Examples of the oxide-based crystalline materials include lithium-containing phosphate compounds having a Nasicon structure, oxides having a perovskite structure, oxides having a garnet structure or a garnet-like structure, and oxide glass ceramic-based lithium ion conductors. Examples of the lithium-containing phosphate compounds having a Nasicon structure include Li ｘ M ｙ (P.O. ４ ) 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)). More specifically, Li １．２ Al ０．２ Ti １．８ (P.O. ４ ) ３Examples of oxides having a perovskite structure include La ０．５５ Li ０．３５ TiO ３ Examples of oxides having a garnet-type or garnet-like structure include Li ７ La ３ Zr ２ O １２ etc.

[0046] In addition, sulfide-based crystal materials include thio-LISICON, for example, Li ３．２５ Ge ０．２５ P ０．７５ S ４ and Li １０ GeP ２ S １２ The crystalline solid electrolyte may include a polymer material (for example, polyethylene oxide (PEO)).

[0047] Examples of glass-based solid electrolytes include oxide-based glass materials and sulfide-based glass materials. Examples of oxide-based glass materials include 50Li ４ SiO ４ ・50Li ３ BO ３ Examples of sulfide-based glass materials include 30Li ２ S・26B ２ S ３ ・44LiI, 63Li ２ S・36SiS ２ ・1Li ３ P.O. ４ , 57Li ２ S・38SiS ２ ・5Li ４ SiO ４ , 70Li ２ S・30P ２ S ５ and 50Li ２ S・50GeS ２ Examples include:

[0048] Examples of glass ceramic solid electrolytes include oxide-based glass ceramic materials and sulfide-based glass ceramic materials. Examples of oxide-based glass ceramic materials include a phosphate compound containing lithium, aluminum, and titanium as constituent elements (LATP) and a phosphate compound containing lithium, aluminum, and germanium as constituent elements (LAGP). Examples of LATP include Li, １．０７ Al ０．６９ Ti １．４６ (P.O. ４ ) ３ Examples of LAGP include Li １．５ Al ０．５ Ge １．５ (P.O. ４ ) and the like. Examples of sulfide-based glass ceramic materials include Li ７ P ３ S １１ and Li ３．２５ P ０．９５ S ４ Examples include:

[0049] 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).

[0050] Sintering Aid The sintering aid contained in the solid electrolyte layer 116 may be, for example, a material similar to the sintering aid that may be contained in the electrode layers (positive electrode layer 112 and negative electrode layer 114).

[0051] (End Electrodes) The end electrodes 120 are arranged on end surfaces of the substantially rectangular parallelepiped solid battery stack 110. The end electrodes 120 may also be arranged on part of the side surfaces of the solid battery stack 110. One of the two end electrodes 120 is connected to the positive electrode layer 112 of the solid battery stack 110, and the other of the two end electrodes 120 is connected to the negative electrode layer 114 of the solid battery stack 110. The end electrodes 120 preferably contain a conductive material with high conductivity. The material constituting the end electrodes 120 is not particularly limited, but may be at least one selected from the group consisting of silver, gold, platinum, aluminum, copper, tin, carbon, and nickel, for example.

[0052] [Substrate] The substrate 200 has a first surface 212 on which the solid-state battery 100 is provided, a second surface 214 opposite the first surface 212, and a first end surface 216 and a second end surface 217 that are connected to the first surface 212 and the second surface 214 at right angles and that face each other.

[0053] The substrate 200 also has a circuit 700 and terminals (terminals on the first surface 212 side are not shown, terminals on the second surface 214 side: external terminals 600) electrically connected to the circuit 700. The terminals are exposed on the first surface 212 and the second surface 214, respectively. The terminal exposed on the first surface 212 is electrically connected to (the end surface electrode 120 of) the solid-state battery 100, and the external terminal 600 exposed on the second surface 214 is electrically connected to other external components. This allows the solid-state battery 100 to be electrically connected to other components connected to the solid-state battery package 1000. The external terminal 600 may protrude in a convex shape from the second surface 214 of the substrate 200, as shown in FIG. 1B , or may be flush with the second surface 214 of the substrate 200.

[0054] The substrate 200 mounts the solid-state battery 100 (i.e., supports and fixes the solid-state battery 100). The substrate 200 covers the bottom surface of the solid-state battery 100 and, together with the metal exterior body 400 having the first exterior body region 410 and the second exterior body region 420, prevents the solid-state battery 100 from being exposed to the outside. This suppresses moisture penetration into the solid-state battery 100.

[0055] The substrate 200 may be integrated with the first exterior body region 410 so that the metal exterior body 400 extends (so that a portion of the first exterior body region 410 is located inside the substrate 200). More specifically, as shown in FIGS. 1B and 1C , the substrate 200 is integrated with the first exterior body region 410 so that the first exterior body region 410 extends from end faces 216, 218. Note that although FIGS. 1B and 1C are cross-sectional views, in a plan view, the metal exterior body 400 (first exterior body region 410) extends from all of the end faces 216, 217, 218, 219 of the substrate 200, as shown in, for example, FIG. 7A (a diagram illustrating a manufacturing method) described below. In other words, the first exterior body region 410 extends from the substrate 200 so that the substrate 200 is surrounded by the first exterior body region 410 in a plan view.

[0056] The area of ​​the main surface of the substrate 200 can be made larger than the mounting surface (side surface, bottom surface) of the solid-state battery 100 in plan view.

[0057] The substrate 200 has conductive layers that constitute the circuit 700 and insulating layers that insulate the conductive layers from each other, and may be a laminate in which multiple conductive layers and multiple insulating layers are stacked in the Z direction. The substrate 200 is, for example, a resin substrate (a substrate made of resin). The insulating layer (resin layer) in a resin substrate contains resin as a base material. The resin layer may be made of resin or may contain resin in part. A resin layer containing resin in part (composite resin layer) may be, for example, inorganic fiber (glass fiber cloth) impregnated with resin. The resin that constitutes the resin layer may be a thermoplastic resin or a thermosetting resin. Examples of such resin substrates include printed wiring boards and flexible substrates.

[0058] The circuit 700 in the substrate 200 also functions as a moisture barrier layer, so that the circuit 700 can also prevent moisture from penetrating through the substrate 200.

[0059] [Insulating Layer] The insulating layer 300 is a layer made of an insulating material. The insulating layer 300 covers the solid-state battery 100 and is interposed between the outer surface of the solid-state battery 100 and the inner surface of the metal exterior body 400, electrically insulating the two components. By employing the insulating layer 300, the solid-state battery package 1000 can reduce the space required for insulation between the metal exterior body 400 and the end electrode 120 compared to an air gap. The volume occupied by the solid-state battery 100 can be increased by the volume equivalent to this reduced space. This can improve the integration density per unit volume. The thickness of the insulating layer 300 is, for example, 0.1 to 30 μm.

[0060] The insulating material of the insulating layer 300 may be, for example, a resin.

[0061] [Metal Exterior Body] The metal exterior body 400 extends from the substrate 200 and covers the solid state battery 100 via the insulating layer 300. The metal exterior body 400 can have a first exterior body region 410 extending from the substrate 200, a second exterior body region 420 covering the solid state battery 100 via the insulating layer 300, and a joint 430 at which the first exterior body region 410 and the second exterior body region 420 are joined to each other at a predetermined location.

[0062] In the solid-state battery package 1000, the solid-state battery 100 inside is protected from the outside not by resin bonding but by metal-to-metal bonding between the first exterior body region 410 and the second exterior body region 420 in the metal exterior body 400. Therefore, moisture penetration can be more effectively suppressed than in conventional solid-state battery packages having resin-to-resin bonding portions.

[0063] In the metal exterior body 400, the first exterior body region 410 and the second exterior body region 420 may be partially joined. As shown in FIG. 1A , on the right side surface (the YZ side surface on the forward X-direction side) of the solid-state battery package 1000, the first exterior body region 410 and the second exterior body region 420 are adjacent to each other via a dashed line (i.e., the first exterior body region 410 and the second exterior body region 420 are continuously integrated). Furthermore, the metal exterior body 400 has a front side surface (the ZX side surface on the reverse Y-direction side), a left side surface (the YZ side surface on the reverse X-direction side: not shown), and a rear side surface (the ZX side surface on the forward Y-direction side: not shown) joined via a joint 430. In this way, one of the four side surfaces of the solid-state battery package 1000 does not have a joint 430. Therefore, such partial joining is preferable because it further suppresses moisture penetration compared to when joints 430 are provided on all four sides. The partial joining of first exterior body region 410 and second exterior body region 420 in metal exterior body 400 will be described in detail in the manufacturing method described below, but can be achieved by folding one continuous sheet of metal exterior body 400 so that first exterior body region 410 and second exterior body region 420 are not separated.

[0064] The thickness of the metal exterior body 400 is, for example, 1 μm to 100 μm.

[0065] The metal exterior body 400 is an exterior body made of metal (e.g., metal foil). That is, the metal exterior body 400 contains a metal, and is preferably made of metal. Metals have lower moisture permeability and superior elasticity compared to resins. Examples of metals that make up the metal foil include Al, Cu, Ni, and alloys (more specifically, SUS (stainless steel)).

[0066] [Method for manufacturing solid-state battery package] A method for manufacturing a solid-state battery package 1000 according to the first embodiment is a method for manufacturing a solid-state battery package in which the metal exterior body 400 has a first exterior body region 410 extending from the substrate 200 and a second exterior body region 420 covering the solid-state battery 100, and includes: overlaying the second exterior body region 420 on the solid-state battery 100 that is mounted on the substrate 200 from which the first exterior body region 410 extends so as to be surrounded by the first exterior body region 410 in a planar view, and that is covered with an insulating layer 300; and metal-bonding the interface between the first exterior body region 410 and the second exterior body region 420 to form a joint 430.

[0067] 7A to 7F, one aspect of a method for manufacturing a solid-state battery package according to the first embodiment will be described. Figures 7A to 7F are plan views schematically illustrating steps in a manufacturing process for a solid-state battery package according to the first embodiment. The manufacturing of the solid-state battery package 1000 was carried out at room temperature (25°C), atmospheric pressure (1 atm), and in an open system, unless otherwise noted.

[0068] As shown in FIGS. 7A to 7F , the manufacturing method of the solid-state battery package 1000 includes: preparing the solid-state battery 100 (preparation process); mounting (providing) the solid-state battery 100 on the substrate 200 on which the first exterior body region 410 extends (solid-state battery mounting process); covering the solid-state battery 100 mounted on the substrate 200 with an insulating layer 300 (insulating layer covering process); folding the metal exterior body 400 so as to cover the solid-state battery 100 covered with the insulating layer 300, and overlapping the first exterior body region 410 and the second exterior body region 420 (exterior overlapping process); joining the first exterior body region 410 and the second exterior body region 420 to form a joint 430 (joint forming process); and cutting and removing excess metal exterior body (cutting process).

[0069] (Preparation Step) In the preparation step, the solid state battery 100 is prepared by, for example, manufacturing or purchasing.

[0070] 7A , in the solid-state battery mounting process, the solid-state battery 100 is mounted (placed and fixed) on the substrate 200 to which the first exterior body region 410 extends. This electrically connects the end surface electrodes 120 of the solid-state battery 100 to the terminals arranged on the first surface 212 of the substrate 200.

[0071] A first exterior body region 410 of the metal exterior body 400 extends from end faces 216-219 of the substrate 200, and the first exterior body region 410 is adjacent to and integrated with the second exterior body region 420 along the dashed line. The substrate 200 from which the first exterior body region 410 extends is, for example, a substrate 200 in which the first exterior body region 410 is sandwiched and integrated within the substrate 200, and as shown in FIG. 7A , a substrate in which the first exterior body region 410 extends from all of the end faces 216, 217, 218, and 219 of the substrate 200. In other words, the first exterior body region 410 extends from (the end faces 216, 217, 218, and 219 of the substrate 200) so as to be surrounded by the first exterior body region 410 in a planar view. When such a substrate is a resin substrate, it can be manufactured integrally with the first exterior body region 410 by, for example, injection molding.

[0072] In the substrate 200 on which the first exterior body region 410 extends, the metal exterior body 400 is a single metal exterior body in which the first exterior body region 410 and the second exterior body region 420 are continuous.

[0073] 7B , in the insulating layer coating step, the solid-state battery 100 mounted on the substrate 200 is coated with an insulating layer 300. This prevents the solid-state battery 100 from being exposed to the outside (e.g., the atmosphere), is isolated from the outside, and is electrically insulated from all parts other than the terminals provided on the first surface 212 of the substrate 200. Specifically, when the insulating layer 300 is made of a resin material, the insulating layer 300 can be formed by a dipping method.

[0074] (Exterior Lamination Process) In the exterior lamination process, as shown in FIG. 7C , the metal exterior body 400 is folded (along the dashed lines) (by a valley fold) to overlap the first exterior body region 410 and the second exterior body region 420 so as to cover the solid state battery 100 coated with the insulating layer 300. In plan view (XY plan view), the second exterior body region 420 has a portion 420a that covers the solid state battery 100 coated with the insulating layer 300 and a portion 420b that contacts the first exterior body region 410. Of these, the portion 420b is in direct contact with the first exterior body region 410 and the second exterior body region 420, and a joint 430 will be formed in the subsequent joint formation process. However, the boundary between the portion 420a and the portion 420b corresponds to the side surface of the solid state battery 100. In reality, the joint 430 may also be formed near the connection between the portion 420a and the portion 420b.

[0075] In the exterior kneading step, if the thickness (length in the Z direction) of the solid-state battery 100 is relatively large, for example, 1000 μm to 5000 μm, the second exterior body region 420 may be embossed in advance to form a recessed shape that conforms to the shape of the solid-state battery 100. This makes it difficult for stress to be applied locally to a predetermined location of the second exterior body region 420 in the exterior kneading step, making it less likely for damage to occur in the second exterior body region 420. Furthermore, the second exterior body region 420 and the solid-state battery 100 can be more closely attached to each other.

[0076] (Joint Forming Process) In the joint forming process, the first exterior body region 410 and the second exterior body region 420 are joined to form the joint 430. Specifically, in the joint forming process, the metal exterior body 400 is joined in two stages. First, as shown in FIG. 7D , in the first stage, two of the four sections (excluding the fold between the first exterior body region 410 and the second exterior body region 420) surrounding the solid-state battery 100 in a planar view are joined (e.g., joined in an L-shape in a planar view) by, for example, welding (more specifically, laser welding or resistance welding) or soldering. In the subsequent second stage, a reduced pressure or vacuum is applied to remove air present between the second exterior body region 420 and the insulating layer 300 to the outside. This allows the metal exterior body 400 and the insulating layer 300 to adhere to each other, increasing the integration density and improving energy density. 7E, the unjoined portions surrounding the solid-state battery 100 in plan view are joined by, for example, welding or soldering, thereby forming a joint that is U-shaped in plan view.

[0077] 7F , the excess metal exterior body 400 is cut and removed. Specifically, the excess metal exterior body 400 is cut from the U-shaped joint portion in plan view. In this manner, the solid-state battery package 1000 according to the first embodiment is manufactured.

[0078] <Modification of First Embodiment> In the solid-state battery package 1000 according to the first embodiment, as shown in FIG. 1A , joints 430 are provided on three of the four side surfaces of the solid-state battery package 1000. The modification of the first embodiment differs from the first embodiment in that joints 430 are provided on all four side surfaces. This different configuration will be mainly described below. Note that in the modification of the first embodiment, the same reference numerals as those in the first embodiment have the same configuration as those in the first embodiment, and therefore, in principle, description thereof will be omitted.

[0079] [Method for manufacturing a solid-state battery package] In a method for manufacturing a solid-state battery package according to a modification of the first embodiment, the raw material is separated into a first exterior body region 410 and a second exterior body region 420. One aspect of the method for manufacturing a solid-state battery package according to a modification of the first embodiment will be described with reference to Figures 8A to 8F. Figures 8A to 8F are plan views illustrating steps in the manufacturing process of a solid-state battery package according to a modification of the first embodiment.

[0080] As shown in FIGS. 8A to 8F , the method for manufacturing a solid-state battery package includes: preparing a solid-state battery 100 (preparation process); mounting (providing) the solid-state battery 100 on a substrate 200 on which a first exterior body region 410 extends (solid-state battery mounting process); covering the solid-state battery 100 mounted on the substrate 200 with an insulating layer 300 (insulating layer covering process); overlapping the second exterior body region 420 on the first exterior body region 410 so as to cover the solid-state battery 100 covered with the insulating layer 300 (exterior overlap process); joining the first exterior body region 410 and the second exterior body region 420 to form a joint 430 (joint forming process); and cutting and removing excess metal exterior body 400 (cutting process).

[0081] 8A and 8B , the solid state battery preparation process to the insulating layer coating process are the same as those in the first embodiment, except that on the substrate 200 on which the first exterior body region 410 extends, the first exterior body region 410 is not continuously integrated with the second exterior body region 420 but is separate from it. In these processes, on the substrate 200 on which the first exterior body region 410 extends, the metal exterior body 400 has only the first exterior body region 410.

[0082] 8C , in the exterior lamination process, the second exterior body region 420 is laminated on the first exterior body region 410 so as to cover the solid state battery 100 coated with the insulating layer 300. Here, the second exterior body region 420 is laminated on the first exterior body region 410 so as to minimize a predetermined space between the second exterior body region 420 and the solid state battery 100 as much as possible.

[0083] (Joint Forming Process) In the joint forming process, the first exterior body region 410 and the second exterior body region 420 are joined to form the joint 430. Specifically, in the joint forming process, the metal exterior body 400 is joined in two stages. First, in the first stage, as shown in FIG. 8D , three of the four sections surrounding the solid-state battery 100 in plan view are joined by, for example, welding or soldering (e.g., joining in a U-shape in plan view). In the subsequent second stage, a reduced pressure or vacuum is applied, and air present between the second exterior body region 420 and the insulating layer 300 is removed to the outside. In this state, as shown in FIG. 8E , the unjoined sections surrounding the solid-state battery 100 in plan view are joined by, for example, welding or soldering. This forms a square-shaped joint in plan view.

[0084] (Cutting Step) In the cutting step, excess metal exterior body 400 is cut and removed, as shown in Fig. 8F. In this manner, the solid-state battery package 1000 according to the modified example of the first embodiment is manufactured.

[0085] In the above-described manufacturing method, a method for manufacturing one solid-state battery package 1000 has been described, but the present invention is not limited to this. For example, two or more solid-state battery packages 1000 may be manufactured in parallel. Specifically, the solid-state battery package 1000 may be manufactured using a mother assembly in which a plurality of solid-state battery packages 1000 are connected together. For example, one first exterior body region 410 bonded to two or more substrates 200 may be prepared, and two or more solid-state battery packages may be manufactured in parallel.

[0086] Second Embodiment The solid-state battery package according to the second embodiment differs from the solid-state battery package 1000 according to the first embodiment in that a non-bonded portion is provided at the interface between the first exterior body region and the second exterior body region. This different configuration will be mainly described below. In the second embodiment, the same reference numerals as those in the first embodiment represent the same configuration as in the first embodiment, and therefore, description thereof will be omitted in principle.

[0087] [Configuration of Solid-State Battery Package] (Metal Exterior Body) The configuration of the solid-state battery package according to the second embodiment will be described with reference to Fig. 2. Fig. 2 is a cross-sectional view schematically showing the configuration of the solid-state battery package according to the second embodiment. As shown in Fig. 2, the interface between the first exterior body region 410A and the second exterior body region 420A is drawn out from the second end surface 217 of the substrate 200, and has a bonded portion 430A and a non-bonded portion 440A.

[0088] The interface between the first exterior body region 410A and the second exterior body region 420A includes a bonded portion 430A and a non-bonded portion 440A. The non-bonded portion 440A is where the first exterior body region 410A and the second exterior body region 420A are in direct contact but not bonded. Note that in FIG. 2 , the non-bonded portion 440A is shown as a white space for ease of explanation. However, in reality, the solid-state battery 100 is housed in the metal exterior body 400 so that substantially no gas is present, and the first exterior body region 410A and the second exterior body region 420A are simply in direct contact without being bonded. However, for example, if gas remains inside the solid-state battery package 1000A during the bond forming process, the gas may accumulate in the non-bonded portion 440A.

[0089] The solid-state battery package 1000A according to the second embodiment can further suppress moisture penetration. The reason for this is presumed, without being bound by any particular theory, to be as follows. In the solid-state battery package 1000A according to the second embodiment, the non-bonded portion 440A is present at the interface between the first exterior body region 410A and the second exterior body region 420A. This allows the first exterior body region 410A and the second exterior body region 420A to shift relative to each other at the non-bonded portion 440A (in FIG. 2 , shift in the X direction, which are opposite each other) even if the solid-state battery 100 expands or contracts during operation. This reduces stress caused by volumetric changes due to expansion or contraction of the solid-state battery 100, thereby suppressing damage to the metal exterior body 400A. Because the metal exterior body 400A can deform in accordance with volumetric changes due to expansion or contraction of the solid-state battery 100, it is believed that the creation of a moisture penetration path due to damage to the metal exterior body 400A can be suppressed.

[0090] Furthermore, because the interface between the first exterior body region 410A and the second exterior body region 420A is drawn out from the second end surface 217 of the substrate 200, the joint 430A between the first exterior body and the second exterior body, which can be a path for moisture penetration, is longer, thereby further suppressing moisture penetration. From the above, it is considered that the solid-state battery package 1000A according to the second embodiment can further suppress moisture penetration.

[0091] The non-bonded portion 440A is in contact with the second end surface 217 of the substrate 200 in a plan view (in an XY plan view), and the bonded portion 430A exists outside the non-bonded portion 440A.

[0092] The joint portion 430A of the metal exterior body 400A may be pulled out from the second end surface 217 of the substrate 200 and may be rolled up as shown in Fig. 2. In addition, although the joint portion 430A pulled out from the second end surface 217 is provided in the reverse X direction of the solid-state battery package 1000A in Fig. 2, it may also be provided in a location other than this (for example, in the forward X direction and forward Y direction of the solid-state battery package 1000A).

[0093] [Method for Manufacturing a Solid-State Battery Package] (Joint Forming Step) In the first step of the joint forming step, as shown in FIGS. 9A and 9B , two of the four sections (excluding the fold between the first exterior body region 410 and the second exterior body region 420) surrounding the solid-state battery 100 in a planar view are joined by, for example, welding or soldering, so as to provide a fixed gap from the solid-state battery 100 covered with the insulating layer 300 toward the outside in a planar view. This fixed gap will later become the non-jointed section 440A. In the subsequent second step, the remaining section surrounding the solid-state battery 100 in a planar view is joined. In this manner, the joint section 430A and the non-jointed section 440A are formed at the interface between the first exterior body region 410 and the second exterior body region 420. In other words, the non-jointed section 440A is formed at a portion of the interface. Note that the joint section 430A may be folded.

[0094] (Cutting Step) In the cutting step, cutting may or may not be performed.

[0095] <Third Embodiment> A solid-state battery package according to a third embodiment differs from the solid-state battery package 1000 according to the first embodiment in that the metal exterior body has wrinkles. This different configuration will be mainly described below. In the third embodiment, the same reference numerals as those in the first embodiment represent the same configuration as in the first embodiment, and therefore, in principle, description thereof will be omitted.

[0096] [Configuration of Solid-State Battery Package] (Metal Exterior Body) The configuration of the solid-state battery package according to the third embodiment will be described with reference to Fig. 3. Fig. 3 is a cross-sectional view schematically showing the configuration of the solid-state battery package according to the third embodiment. As shown in Fig. 3, the metal exterior body 400B has wrinkles in the second exterior body region 420B that covers the solid-state battery 100.

[0097] The solid-state battery package 1000B according to the third embodiment can further suppress moisture penetration. The reason for this is presumed to be as follows, without being bound by any particular theory. In the solid-state battery package 1000B according to the third embodiment, the metal exterior body 400B has wrinkles in the second exterior body region 420B that covers the solid-state battery 100. Therefore, even if the solid-state battery 100 expands or contracts during operation of the solid-state battery 100, the metal exterior body 400B can deform in response to the volumetric change caused by the expansion and contraction of the solid-state battery 100. This reduces stress caused by the volumetric change of the solid-state battery 100, thereby preventing damage to the metal exterior body 400B. Because the metal exterior body 400B can deform in response to the volumetric change caused by the expansion and contraction of the solid-state battery 100, it is believed that the creation of a moisture penetration path due to damage to the metal exterior body 400B can be further prevented.

[0098] In a cross-sectional view, the wrinkles have a structure that protrudes inward or outward (taking the second exterior body region 420B on the left side of FIG. 3 as an example, the inner side is the forward X direction and the outer side is the reverse X direction) based on an imaginary plane (the YZ plane in FIG. 3) parallel to the side surface of the solid-state battery 100 on which the metal exterior body 400B is provided.

[0099] The second exterior body region 420B of the metal exterior body 400B has wrinkles, but more specifically, it may have a bellows structure. In this specification, the bellows structure refers to a structure in which, in a cross-sectional view, the second exterior body region 420B alternately protrudes inward and outward (in the case of the second exterior body region 420B on the left side of FIG. 2 , the inner side is the forward X direction and the outer side is the reverse X direction) based on a virtual surface (the YZ plane in FIG. 3 ) parallel to the surface of the solid-state battery 100 on which the metal exterior body 400B is provided; in other words, a structure in which mountain folds and valley folds are alternately repeated. Note that, for convenience of explanation, the second exterior body region 420B in FIG. 3 forms a hollow, closed space. However, in reality, the solid-state battery 100 is housed within the metal exterior body 400B in a manner that is substantially free of gas, and the folded second exterior body regions 420B are simply in direct contact within this space without being bonded to each other. However, for example, if gas is generated inside the solid-state battery package 1000B in the joint forming step, the gas may accumulate in the areas where the second exterior body regions 420B are in contact with each other.

[0100] 3, the wrinkles are provided over the entire end faces (YZ plane) of the solid-state battery 100 via the insulating layer 300, but are not limited to this. The wrinkles may be arranged, for example, on the top surface (XY plane), on one of the end faces, or on a part of one of the end faces.

[0101] [Manufacturing Method of Solid-State Battery Package] (Exterior Lamination Step) The first exterior body region 410B and the second exterior body region 420B are laminated so as to cover the solid-state battery 100 coated with the insulating layer 300. Here, the second exterior body region 420B is laminated so as to leave a predetermined space between the second exterior body region 420B and the solid-state battery 100.

[0102] (Joint Forming Process) As shown below, the wrinkles are formed by joining the first exterior body region 410B and the second exterior body region 420B under reduced pressure or vacuum. Specifically, compared to the manufacturing method of the solid-state battery package according to the first embodiment, the pressure in the second stage is suddenly reduced from atmospheric pressure to vacuum, forming wrinkles in the second exterior body region 420B. In this state, the first exterior body region 410B and the second exterior body region 420B are joined in the second stage. Note that by forming alternating mountain folds and valley folds in a predetermined region of the second exterior body region 420B and then forming the joint 430B, the metal exterior body 400B can have a bellows structure.

[0103] <Fourth Embodiment> A solid-state battery package according to a fourth embodiment differs from the solid-state battery package 1000 according to the first embodiment in that a metal exterior body further covers the main surface of the substrate. This different configuration will be mainly described below. In the fourth embodiment, the same reference numerals as those in the first embodiment represent the same configuration as in the first embodiment, and therefore, description thereof will be omitted in principle.

[0104] [Configuration of Solid-State Battery Package] (Metal Exterior Body) The configuration of a solid-state battery package according to the fourth embodiment will be described with reference to Fig. 4. Fig. 4 is a cross-sectional view schematically showing the configuration of the solid-state battery package according to the fourth embodiment. As shown in Fig. 4, in the metal exterior body 400C, the first exterior body region 410C extends from the second surface 214 of the substrate 200 and covers a portion of the second surface 214 and the end surfaces 216 and 217 of the substrate 200.

[0105] The solid-state battery package 1000C according to the fourth embodiment can further suppress moisture penetration. The reason for this is presumed to be as follows, without being bound by any particular theory. In the solid-state battery package 1000C according to the fourth embodiment, routes through which moisture can easily penetrate from the outside include the substrate 200 and the joint between the substrate 200 and the metal exterior body 400C. In the solid-state battery package 1000C, the metal exterior body 400C covers the second surface 214 opposite the first surface 212 on which the solid-state battery 100 is provided. This reduces the exposed area (of the second surface 214) of the substrate 200, which can be a route through which moisture can easily penetrate from the outside, and increases the joint area between the substrate 200 and the metal exterior body 400C (i.e., increases the length of the penetration route). This is believed to further suppress moisture penetration from the outside.

[0106] In the fourth embodiment, the area of ​​the covered portion 214b of the second surface 214 of the substrate 200 is smaller than that of the exposed portion 214a of the second surface 214. However, this is not limiting. For example, the area of ​​the covered portion 214b may be equal to or larger than the area of ​​the exposed portion 214a.

[0107] [Method of Manufacturing Solid-State Battery Package] (Solid-State Battery Arrangement Step) In the solid-state battery arrangement step, a first exterior body region 410C extending from the second surface 214 of the substrate 200 is employed, instead of the first exterior body region 410 extending from the end surfaces 216, 217 of the substrate 200 of the first embodiment. The first exterior body region 410C extending from the second surface 214 of the substrate 200 is, for example, a resin substrate in which the first exterior body region 410C is sandwiched and integrated within the substrate 200, and as shown in Fig. 4, the first exterior body region 410C extends near the outer edge of the second surface 214 of the substrate 200. When the substrate 200 is a resin substrate, the resin substrate can be manufactured integrally with the first exterior body region 410C by, for example, injection molding.

[0108] Fifth Embodiment A solid-state battery package according to a fifth embodiment differs from the solid-state battery package 1000 according to the first embodiment in the material of the substrate. This different configuration will be mainly described below.

[0109] [Configuration of Solid State Battery Package] (Metallic Exterior Body) In the solid state battery package according to the fifth embodiment, the substrate is a ceramic substrate.

[0110] The solid-state battery package according to the fifth embodiment can further suppress the penetration of moisture. The reason for this is presumed to be as follows, without being bound by any particular theory. In the solid-state battery package according to the fifth embodiment, the substrate can be cited as a route through which moisture can penetrate relatively easily from the outside. It is believed that the solid-state battery package according to the fifth embodiment can further suppress the penetration of moisture from the outside by using a ceramic substrate (i.e., a substrate made of ceramic) with a relatively low moisture permeability.

[0111] Examples of materials that can be used to form the ceramic substrate include alumina, alumina zirconia, aluminum nitride, and silicon nitride.

[0112] [Method for Manufacturing Solid-State Battery Package] The method for manufacturing a solid-state battery package can be the same as the manufacturing method of the first embodiment, except that a ceramic substrate is used as the substrate instead of a resin substrate.

[0113] Sixth Embodiment The solid-state battery package according to the sixth embodiment differs from the solid-state battery package 1000 according to the first embodiment in that it further includes a resin sealing layer. This different configuration will be mainly described below. In the sixth embodiment, the same reference numerals as those in the first embodiment represent the same configuration as in the first embodiment, and therefore, in principle, description thereof will be omitted.

[0114] [Configuration of Solid-State Battery Package] (Metal Exterior Body) The configuration of the solid-state battery package according to the sixth embodiment will be described with reference to Fig. 5. Fig. 5 is a cross-sectional view schematically showing the configuration of the solid-state battery package according to the sixth embodiment. As shown in Fig. 5, the solid-state battery package 1000D includes a resin sealing layer 500 that seals the metal exterior body 400.

[0115] The solid-state battery package 1000D according to the sixth embodiment can further suppress moisture penetration. The reason for this is presumed to be as follows, without being bound by any particular theory. The solid-state battery package 1000D according to the sixth embodiment further includes a resin sealing layer 500 that seals the metal exterior body 400, thereby improving the impact resistance of the metal exterior body 400. For this reason, even when external stress caused by, for example, dropping the solid-state battery package 1000D or an external impact during transportation is applied to the solid-state battery package 1000D, the metal exterior body 400 is less likely to break, and it is believed that this can further suppress moisture penetration due to breakage.

[0116] The resin that constitutes the resin sealing layer is, for example, epoxy resin, silicone resin, urethane resin, phenol resin, etc. The thickness of the resin sealing layer 500 is, for example, 10 μm to 1000 μm.

[0117] [Method for manufacturing a solid-state battery package] The method for manufacturing a solid-state battery package includes further sealing the metal exterior body 400 with a resin sealing layer (resin sealing layer forming step) after joining the first exterior body region 410 and the second exterior body region 420 (i.e., after the joint forming step).

[0118] (Resin sealing layer forming process) In the resin sealing layer forming process, for example, a resin dispersion liquid in which resin particles are dispersed is applied to the top surface and side surface of the solid battery package 1000 obtained after the cutting process of the first embodiment to form a coating film. Then, the coating film can be formed by drying and heating.

[0119] Other Embodiments Although the embodiments of the present disclosure have been described above, the above-described embodiments are merely exemplary examples. Therefore, it will be readily understood by those skilled in the art that the present disclosure is not limited to the above-described embodiments, and that various aspects, such as design modifications and combinations of embodiments, are possible within the scope of the gist of the present disclosure.

[0120] For example, in the first to sixth embodiments, the metal exterior housings 400, 400A, 400B, and 400C are insulated from either of the two external terminals 600, but this is not limiting. For example, the metal exterior housings 400, 400A, 400B, and 400C may be electrically connected to either of the two external terminals 600 (with the other external terminal 600 being electrically insulated from the metal exterior housing). This will be described as a modified example of the fourth embodiment. In this modified example of the fourth embodiment, the first exterior housing region 410C shown in FIG. 4 is connected to one of the external terminals 600 arranged on the second surface 214 of the substrate 200. Therefore, a positive or negative voltage is applied to the first exterior housing region 410C. Therefore, in this modified example, the top or side surface of the first exterior housing region 410C can be electrically connected to other electronic components. Since there is no need to provide a new circuit for electrical connection, the degree of integration can be further improved.

[0121] The configurations of the above-described embodiments may also be combined. Fig. 6 is a cross-sectional view schematically showing the configuration of a solid-state battery package according to another embodiment. As shown in Fig. 6, a solid-state battery package 1000E according to another embodiment includes a resin sealing layer 500E that seals a metal exterior body 400C, and a first exterior body region 410C extends from the second surface 214 of the substrate 200 on which the solid-state battery 100 is provided, and covers a portion of the second surface 214 and end surfaces 216, 217 of the substrate 200.

[0122] The resin sealing layer 500E covers the entire second surface 214 of the substrate 200. The solid-state battery package 1000E further has an extension portion 800 that is joined to an external terminal 600. By having the extension portion 800, the solid-state battery package 1000E can be further electrically connected to other external members.

[0123] Aspects of a solid ionization package according to the present disclosure are as follows. <1> A solid-state battery package comprising: a substrate; a solid-state battery provided on the substrate; and a metal exterior body extending from the substrate and covering the solid-state battery via an insulating layer, the metal exterior body having a joint joined to each other at a predetermined location, and the solid-state battery being sealed by the metal exterior body having the joint. <2> The solid-state battery package according to <1>, wherein the substrate is integrated with the metal exterior body so as to have a portion of the metal exterior body therein, and the joint is formed by bonding metal to metal. <3> The solid-state battery package according to <1> or <2>, wherein the metal exterior body has a first exterior body region extending from the substrate, a second exterior body region covering the solid-state battery, and the joint where the first exterior body region and the second exterior body region are joined to each other at a predetermined location, and the first exterior body region and the second exterior body region are at least partially joined. <4> The solid-state battery package according to <3>, wherein the interface between the first exterior body region and the second exterior body region is drawn out from an end face of the substrate and has the joint portion and the non-joint portion. <5> The solid-state battery package according to <3> or <4>, wherein the metal exterior body has wrinkles in the second exterior body region covering the solid-state battery. <6> The solid-state battery package according to any one of <3> to <5>, wherein the substrate has a first surface on which the solid-state battery is provided and a second surface opposite the first surface, and the first exterior body region extends from the second surface of the substrate and covers a part of the second surface and an end face of the substrate. <7> The solid-state battery package according to <6>, wherein the second surface has two external terminals electrically connected to two end face electrodes of the substantially rectangular solid-state battery, respectively, via a circuit inside the substrate, and one of the two external terminals is joined to the first exterior body region. <8> The solid-state battery package according to any one of <1> to <7>, wherein the substrate is a ceramic substrate. <9> The solid-state battery package according to any one of <1> to <8>, further comprising a resin sealing layer that seals the metal exterior body.<10> A method for manufacturing a solid-state battery package according to any one of <1> to <9>, wherein the metal exterior body has a first exterior body region extending from the substrate and a second exterior body region covering the solid-state battery, comprising: overlapping the second exterior body region on the solid-state battery mounted on the substrate along which the first exterior body region extends so as to be surrounded by the first exterior body region in a planar view and covered with the insulating layer, and metal-bonding an interface between the first exterior body region and the second exterior body region to form a joint that seals the solid-state battery. <11> The method for manufacturing a solid-state battery package according to <10>, wherein, in forming the joint, on the substrate along which the first exterior body region extends, the metal exterior body is a single metal exterior body in which the first exterior body region and the second exterior body region are continuous, or has only the first exterior body region. <12> The method for manufacturing a solid-state battery package according to <10> or <11>, wherein, in forming the joint, a non-jointed portion is formed at a part of the interface between the first exterior body region and the second exterior body region. <13> The method for manufacturing a solid-state battery package according to any one of <10> to <12>, wherein, in forming the joint, the first exterior body region and the second exterior body region are joined under reduced pressure or vacuum conditions. <14> The method for manufacturing a solid-state battery package according to any one of <10> to <13>, wherein, in forming the joint, the first exterior body region extends from an end face or a second surface of the substrate. <15> The method for manufacturing a solid-state battery package according to any one of <10> to <14>, further comprising, after metal joining of the first exterior body region and the second exterior body region, sealing the metal exterior body with a resin sealing layer.

[0124] The solid-state battery package according to the present disclosure can be used in applications that typically require the use of electrical energy. For example, the solid-state battery package according to the present disclosure can be used in various fields where power storage is required. Although merely illustrative, the (secondary) battery of the present disclosure can be used in the electrical, information, and communications fields where electrical and electronic devices are used (for example, the electrical and electronic device fields or mobile device fields including mobile phones, smartphones, laptop computers, digital cameras, activity monitors, arm computers, electronic paper, wearable devices, and small electronic devices such as RFID tags, card-type electronic money, and smart watches), household and small industrial applications (for example, power tools, golf carts, and household, nursing care, and industrial robots), large industrial applications (for example, forklifts, elevators, and port cranes), transportation systems (for example, hybrid cars, electric cars, buses, trains, electrically assisted bicycles, and electric motorcycles), power system applications (for example, various power generation systems, road conditioners, smart grids, and general household installation-type power storage systems), medical applications (medical devices such as earphone hearing aids), pharmaceutical applications (dose management systems), as well as the IoT field, and space and deep-sea applications (for example, space probes, submersible research vessels, and the like).

[0125] 1000, 1000A, 1000B, 1000C, 1000D, 1000E, Solid-state battery package 100 Solid-state battery 110 Solid-state battery stack 112 Positive electrode layer 114 Negative electrode layer 116 Solid electrolyte layer 120 End electrode 200 Substrate 212 First surface 214 Second surface 214a (Second surface) exposed surface 214b (Second surface) covered surface 216 First end surface 217 Second end surface 218 Third end surface 219 Fourth end surface 300 Insulating layer 400, 400A, 400B, 400C, Metal outer casing 410, 410A, 410B, 410C, First outer casing region 420, 420A, 420B, Second outer casing region 430, 430A, 430B, joint part 440A non-joint part 500, 500E resin sealing layer 600 external terminal 700 circuit 800 extension part

Claims

1. A solid-state battery package comprising: a substrate; a solid-state battery provided on the substrate; and a metal exterior body extending from the substrate and covering the solid-state battery with an insulating layer interposed therebetween, the metal exterior body having a joint where the metal exterior bodies are joined together at predetermined locations, and the solid-state battery is sealed by the metal exterior body having the joint.

2. The solid-state battery package according to claim 1, wherein the substrate is integrated with the metal exterior body so as to have a portion of the metal exterior body inside the substrate, and the joint is formed by bonding metal to metal.

3. The solid-state battery package according to claim 1 or 2, wherein the metal exterior body has a first exterior body region extending from the substrate, a second exterior body region covering the solid-state battery, and a joint where the first exterior body region and the second exterior body region are joined to each other at a predetermined location, and the first exterior body region and the second exterior body region are at least partially joined.

4. The solid-state battery package according to claim 3, wherein the interface between the first exterior body region and the second exterior body region is drawn out from the end face of the substrate and has the joint portion and the non-joint portion.

5. The solid-state battery package according to claim 3 or 4, wherein the metal exterior body has wrinkles in the second exterior body region covering the solid-state battery.

6. A solid-state battery package according to any one of claims 3 to 5, wherein the substrate has a first surface on which the solid-state battery is provided and a second surface opposite the first surface, and the first exterior body region extends from the second surface of the substrate and covers a portion of the second surface and an end surface of the substrate.

7. The solid-state battery package according to claim 6, further comprising two external terminals on the second surface that are electrically connected to two end surface electrodes of the substantially rectangular solid-state battery via a circuit inside the substrate, one of the two external terminals being joined to the first exterior body region.

8. The solid-state battery package according to any one of claims 1 to 7, wherein the substrate is a ceramic substrate.

9. The solid-state battery package according to any one of claims 1 to 8, further comprising a resin sealing layer that seals the metal exterior body.

10. A method for manufacturing a solid-state battery package according to any one of claims 1 to 9, wherein the metal exterior body has a first exterior body region extending from the substrate and a second exterior body region covering the solid-state battery, the method comprising: overlapping the second exterior body region on the solid-state battery that is mounted on the substrate to which the first exterior body region extends so as to be surrounded by the first exterior body region in a plan view and that is covered with the insulating layer, and metal-bonding the interface between the first exterior body region and the second exterior body region to form a joint that seals the solid-state battery.

11. The method for manufacturing a solid-state battery package according to claim 10, wherein, in forming the joint, on the substrate on which the first exterior body region extends, the metal exterior body is a single metal exterior body in which the first exterior body region and the second exterior body region are continuous, or has only the first exterior body region.

12. The method for manufacturing a solid-state battery package according to claim 10 or 11, wherein in forming the joint portion, a non-joint portion is formed at a part of the interface between the first exterior body region and the second exterior body region.

13. The method for manufacturing a solid-state battery package according to any one of claims 10 to 12, wherein the first exterior body region and the second exterior body region are joined together under reduced pressure or vacuum conditions to form the joint.

14. The method for manufacturing a solid-state battery package according to any one of claims 10 to 13, wherein in forming the joint, the first exterior body region extends from an end face or a second face of the substrate.

15. A method for manufacturing a solid-state battery package according to any one of claims 10 to 14, further comprising sealing the metal exterior body with a resin sealing layer after metal bonding of the first exterior body region and the second exterior body region.

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