Solid battery package

Abstract

The present disclosure provides a solid battery package which is provided with: a base part that is provided with an external mounting terminal; a solid battery that is disposed so as to face a main surface of the base part; and an exterior body that seals the solid battery. The external mounting terminal and the solid battery are electrically connected via a battery mounting part to which the solid battery is joined, and a circuit pattern that is connected to the battery mounting part and extends to the base part. The solid battery is joined to the battery mounting part in a region other than a region facing the main surface of the base part.

Description

Solid battery package

[0001] This disclosure relates to solid-state battery packages (in particular to solid-state batteries packaged to facilitate substrate mounting).

[0002] Rechargeable batteries, which can be repeatedly charged and discharged, have long been used for a variety of applications. For example, rechargeable batteries are used 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 transfer that contributes to charging and discharging. In other words, so-called electrolyte solutions are used in secondary batteries. However, in such secondary batteries, safety is generally required in terms of preventing electrolyte leakage. Furthermore, since organic solvents used in electrolyte solutions are flammable substances, safety is required in that respect as well.

[0004] Therefore, research is underway on solid-state batteries that use a solid electrolyte instead of a liquid electrolyte. One such embodiment of a solid-state battery is shown in Patent Document 1, which comprises a base, a battery element joined to the base, and an outer casing that houses the battery element and has an internal space.

[0005] International Publication No. 2012 / 081366

[0006] The inventors of the present invention have found that there are areas for improvement in conventional solid-state batteries. Specifically, when a battery is charged and discharged, the battery elements expand and contract, and this expansion and contraction can cause stress to be generated in the base directly bonded to the battery elements, potentially placing a load on the base.

[0007] Therefore, the present disclosure aims to provide a solid-state battery package that can alleviate the stress generated at the base during charging and discharging of the solid-state battery.

[0008] As a result of diligent research to resolve the above-mentioned problems, the inventor has arrived at the invention of a secondary battery that achieves the above-mentioned main objective.

[0009] A solid battery package according to one embodiment of the present disclosure comprises a base portion having external mounting terminals, a solid battery disposed opposite the main surface of the base portion, and an outer casing for sealing the solid battery, wherein the external mounting terminals and the solid battery are electrically connected via a battery mounting portion to which the solid battery is joined, and a circuit pattern connected to the battery mounting portion and extending to the base portion, and the solid battery is joined to the battery mounting portion in a region different from the region of the base portion facing the main surface.

[0010] The solid-state battery package of this disclosure makes it possible to alleviate the stress generated at the base during charging and discharging of the solid-state battery.

[0011] Figure 1 is a schematic perspective view showing a packaged solid battery (solid battery package) according to the first embodiment of this disclosure. Figure 2 is a schematic cross-sectional view showing the A-A section of the solid battery package of Figure 1. Figure 3 is a schematic cross-sectional view showing the B-B section of the solid battery package of Figure 1. Figure 4 is a schematic cross-sectional view showing the A-A section of the solid battery package according to the first embodiment of this disclosure. Figure 5 is a schematic cross-sectional view showing the A-A section of a solid battery package according to a modified example of the first embodiment of this disclosure. Figure 6 is a schematic cross-sectional view showing the A-A section of the solid battery package according to the second embodiment of this disclosure. Figure 7 is a schematic cross-sectional view showing the B-B section of the solid battery package according to the second embodiment of this disclosure. Figure 8 is a schematic cross-sectional view showing the C-C section of the solid battery package according to the second embodiment of this disclosure. Figure 9 is a schematic cross-sectional view showing the A-A section of the solid battery package according to the third embodiment of this disclosure. Figure 10 is a schematic cross-sectional view showing the B-B section of the solid battery package according to the third embodiment of this disclosure. Figure 11A is a schematic diagram illustrating a method for manufacturing a solid battery package according to one embodiment of the present disclosure. Figure 11B is a schematic diagram illustrating a method for manufacturing a solid battery package according to one embodiment of the present disclosure. Figure 11C is a schematic diagram illustrating a method for manufacturing a solid battery package according to one embodiment of the present disclosure. Figure 11D is a schematic diagram illustrating a method for manufacturing a solid battery package according to one embodiment of the present disclosure. Figure 11E is a schematic diagram illustrating a method for manufacturing a solid battery package according to one embodiment of the present disclosure. Figure 11F is a schematic diagram illustrating a method for manufacturing a solid battery package according to one embodiment of the present disclosure.

[0012] The embodiments of this disclosure will be described in detail below. It should be noted that the applicant provides the following descriptions and examples to enable those skilled in the art to fully understand this disclosure, and is not intended to limit the subject matter described in the claims. In other words, this disclosure is not particularly limited to the preferred embodiments described below, and can be modified and implemented as appropriate within the scope of its purpose. For convenience, embodiments and examples may be presented separately to facilitate explanation or understanding of key points, but partial substitution and / or combination of configurations shown in different embodiments is possible. In descriptions of such embodiments, redundant explanations of substantially identical matters may be omitted, and only differences may be described. In particular, similar effects and benefits from similar configurations may not be mentioned sequentially in each embodiment.

[0013] The various numerical ranges referred to herein are intended to include the lower and upper limits themselves, unless otherwise specified. The term "approximately" means that a variation or difference of a few percent, for example, ±10%, may be included.

[0014] In this specification, "cross-sectional view" refers to the shape of a solid battery package viewed from a direction approximately perpendicular to the thickness direction of the base (simply put, it is based on the shape obtained by cutting it with a plane parallel to the thickness direction of the base). In this specification, "plan view" refers to a sketch of the object viewed from above or below along the thickness direction of the base.

[0015] In this specification, "up and down direction" and "left and right direction" as used directly or indirectly correspond to the up and down direction and left and right direction in the figures, respectively. Unless otherwise specified, the same reference numeral or symbol indicates the same component, part, or has the same meaning.

[0016] Furthermore, in this specification, "on top of" the base, etc., includes not only cases where it is in contact with the upper surface of the base, etc., but also cases where it is not in contact with the upper surface of the base, etc. That is, "on top of" the base, etc., includes cases where a new layer, etc., is formed above the base, etc., and / or where another layer, etc., is interposed between it and the base, etc. Also, "on top of" does not necessarily mean the upper side in the vertical direction. "On top of" merely indicates the relative positional relationship of the base, etc.

[0017] As used herein, "approximately perpendicular" does not necessarily mean perfectly perpendicular, but includes configurations that are slightly off from it (for example, within a range of ±20° from perfect perpendicular, or within a range of ±10°).

[0018] Furthermore, the term "approximately parallel" as used herein does not necessarily mean perfectly parallel, but includes configurations that are slightly deviated from perfect parallelism (for example, within a range of ±20° from perfect parallelism, or within a range of ±10°).

[0019] [Solid-state battery package] <First embodiment> Figure 1 is a schematic perspective view showing the configuration of a packaged solid-state battery (solid-state battery package) according to the first embodiment of the present disclosure. Figure 2 is a schematic cross-sectional view showing the A-A section of the solid-state battery package shown in Figure 1. Figure 3 is a schematic cross-sectional view showing the B-B section of the solid-state battery package shown in Figure 1.

[0020] As shown in Figures 1 to 3, the solid battery package 1000 according to the first embodiment comprises, as its main components, a base portion 200, a solid battery 100 disposed on the base portion 200 and having end-face electrodes 120 on its end face, and an outer casing 400 that surrounds at least a part of the base portion 200 and the solid battery 100.

[0021] In this specification, "solid-state battery package" refers to a packaged solid-state battery, broadly speaking, to a solid-state battery device configured to protect the solid-state battery from the external environment. In a narrower sense, it refers to a solid-state battery device that includes a mountable base and is protected from the external environment.

[0022] First, the basic configuration of the solid-state battery package 1000 will be described below. Then, the characteristic features of the first embodiment will be described.

[0023] <Basic Configuration of Solid-State Battery> First, the basic configuration of the solid-state battery package 1000 will be explained. Specifically, each component of the solid-state battery package 1000 will be explained.

[0024] The solid battery 100 is a stacked solid battery configured such that each layer constituting the battery component unit is stacked on top of each other, and preferably each such layer is made of a fired body.

[0025] The solid-state battery 100 comprises a solid-state battery stack 110 and two opposing end-face electrodes 120 positioned on the end faces of the solid-state battery stack 110. The solid-state battery stack 110 may have a substantially rectangular parallelepiped shape. The solid-state battery stack 110 is constructed by alternately stacking multiple positive electrode layers 112 and negative electrode layers 114 via a solid electrolyte layer 116. The positive electrode layer 112, as an electrode layer, is electrically connected to one of the two end-face electrodes 120. The negative electrode layer 114, as an electrode layer, is electrically connected to the other of the two end-face electrodes 120. Thus, the solid-state battery 100 comprises a positive end-face electrode connected to the positive electrode layer 112 and a negative end-face electrode connected to the negative electrode layer 114.

[0026] In this specification, "solid-state battery" broadly refers to a battery whose components are made of solids, and narrowly refers to an all-solid-state battery whose components (particularly preferably all components) are made of solids. Examples of solid-state batteries 100 include so-called secondary batteries (more specifically, rechargeable batteries) that can be repeatedly charged and discharged, and primary batteries that can only be discharged.

[0027] (Electrode layer: 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 also include a positive electrode current collector layer.

[0028] The negative electrode layer 114 contains at least a negative electrode active material, may further contain at least one selected from the group consisting of solid electrolytes, conductive materials and sintering aids, and may further include a negative electrode current collector layer. The material constituting the negative electrode layer 114 may be the same as the material constituting the positive electrode layer 112.

[0029] -Active material- An active material (a positive electrode active material and a negative electrode active material) is a substance that participates in ion transfer in the solid battery 100. Charge and discharge are performed by transfer (conduction) of ions (particularly lithium ions or sodium ions) between the positive electrode layer 112 and the negative electrode layer 114 via the solid electrolyte to achieve ion transfer. Each electrode layer of the positive electrode layer 112 and the negative electrode layer 114 is particularly preferably a layer capable of intercalating and deintercalating lithium ions or sodium ions. That is, the solid battery 100 is preferably an all-solid-state secondary battery in which charge and discharge are performed by movement of lithium ions or sodium ions between the positive electrode layer 112 and the negative electrode layer 114 via the solid electrolyte layer 116.

[0030] =Positive electrode active material= Examples of the positive electrode active material capable of intercalating and deintercalating lithium ions include at least one selected from the group consisting of lithium-containing phosphate compounds having a NASICON-type structure, lithium-containing phosphate compounds having an olivine-type structure, lithium-containing layered oxides, and lithium-containing oxides having a spinel-type structure. As an example of the lithium-containing phosphate compound having a NASICON-type structure, Li ３ V ２ (PO ４ ) ３ and the like. As an example of the lithium-containing phosphate compound having an olivine-type structure, Li ３ Fe ２ (PO ４ ) ３ , LiFePO ４ , and / or LiMnPO ４ and the like. As an example of the lithium-containing layered oxide, LiCoO ２ and / or LiCo １／３ Ni １／３ Mn １／３ O ２Examples include LiMn. ２ O ４ and / or LiNi ０．５ Mn １．５ O ４ Examples include lithium compounds, although they are not particularly limited, such as lithium transition metal composite oxides and lithium transition metal phosphate compounds. Lithium transition metal composite oxides are oxides that contain lithium and one or more transition metal elements as constituent elements. Lithium transition metal phosphate compounds are phosphate compounds that contain lithium and one or more transition metal elements as constituent elements. The types of transition metal elements are not particularly limited, but examples include cobalt (Co), nickel (Ni), manganese (Mn), and iron (Fe).

[0031] Furthermore, examples of positive electrode active materials capable of intercalating and deintercalating sodium ions include at least one selected from the group consisting of sodium-containing phosphate compounds having a nasicone-type structure, sodium-containing phosphate compounds having an olivine-type structure, sodium-containing layered oxides, and sodium-containing oxides having a spinel-type structure. An example of a positive electrode active material is a sodium-containing phosphate compound such as Na ３ V ２ (PO ４ ) ３ NaCoFe ２ (PO ４ ) ３ Na ２ Ni ２ Fe(PO ４ ) ３ Na ３ Fe ２ (PO ４ ) ３ Na ２ FeP ２ O ７ and Na ４ Fe ３ (PO ４ ) ２ (P ２ O ７ ) and NaFeO as a sodium-containing layered oxide ２At least one selected from the group consisting of the following is mentioned.

[0032] Other examples of positive electrode active materials include oxides, disulfides, and conductive polymers. Examples of oxides include titanium dioxide, vanadium oxide, or manganese dioxide. Examples of disulfides include titanium disulfide or molybdenum sulfide. Examples of chalcogenides include niobium selenide. Examples of conductive polymers include disulfides, polypyrrole, polyaniline, polythiophene, polyparastyrene, polyacetylene, or polyacene.

[0033] =Negative Electrode Active Material= Examples of negative electrode active materials capable of intercalating and deintercalating lithium ions include 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 NASCICON-type structure, lithium-containing phosphate compounds having an olivine-type structure, and lithium-containing oxides having a spinel-type structure. An example of a lithium alloy is Li-Al. An example of a lithium-containing phosphate compound having a NASCICON-type structure is Li ３ V ２ (PO ４ ) ３ , and / or LiTi ２ (PO ４ ) ３ Examples include Li ３ Fe ２ (PO ４ ) ３ , and / or LiCuPO ４ Examples include Li ４ Ti ５ O １２ These are some examples.

[0034] Furthermore, examples of negative electrode active materials capable of intercalating and deintercalating sodium ions include at least one selected from the group consisting of sodium-containing phosphate compounds having a nasicone-type structure, sodium-containing phosphate compounds having an olivine-type structure, and sodium-containing oxides having a spinel-type structure.

[0035] -Conductive materials- Examples of conductive materials include at least one conductive material selected from the group consisting of metallic materials such as silver, palladium, gold, platinum, aluminum, copper, and nickel, as well as carbon.

[0036] - Sintering aids - Examples of sintering aids 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.

[0037] - Current Collector Layer - The current collector layers (positive electrode current collector layer and negative electrode current collector layer) may each be in the form of foil. However, if greater emphasis is placed on improving electronic conductivity through integral firing, reducing the manufacturing cost of the solid-state battery 100, and / or reducing the internal resistance of the solid-state battery 100, the current collector layers may be in the form of a fired 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 connection parts for electrically connecting to the outside and may be configured to be electrically connectable to the end face electrode 120. When the current collector layers are in the form of a fired body, they may be made of a fired body containing a conductive material and a sintering aid. The conductive material included in the current collector layer may be selected from materials similar to those that may be included in the electrode layers (positive electrode layer 112 and negative electrode layer 114). The sintering aid included in the positive electrode current collector layer and the negative electrode current collector layer may be selected from materials similar to those that may be included in the positive electrode layer 112 and the negative electrode layer 114, respectively.

[0038] The thickness of the positive electrode layer 112 and the negative electrode layer 114 is not particularly limited, but for example, they may be 2 μm or more and 200 μm or less, and especially 5 μm or more and 100 μm or less, respectively.

[0039] (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 ion conduction between these electrode layers. The solid electrolyte layer 116 may also exist 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.

[0040] 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, and more particularly 1 μm or more and 200 μm or less. In this specification, the thickness of the solid electrolyte layer 116 is the thickness of the solid electrolyte layer 116 disposed between the positive electrode layer 112 and the negative electrode layer 114.

[0041] -Solid Electrolyte- The solid electrolyte layer 116 contains a solid electrolyte and may further contain a sintering aid. The solid electrolyte is made of a material that can conduct ions (for example, lithium ions or sodium ions). In particular, the solid electrolyte layer 116 that forms a battery component unit in the solid battery 100 may form a layer between the positive electrode layer 112 and the negative electrode layer 114 that can conduct lithium ions. Examples of solid electrolytes include at least one selected from the group consisting of crystalline solid electrolytes, glass-based solid electrolytes, and glass-ceramic solid electrolytes.

[0042] This section describes solid electrolytes capable of conducting lithium ions. Examples of crystalline solid electrolytes include oxide-based crystalline materials and sulfide-based crystalline materials. Examples of oxide-based crystalline materials include lithium-containing phosphate compounds having a NASICON structure, oxides having a perovskite structure, oxides having a garnet-type or garnet-type similar structure, and oxide glass ceramic lithium ion conductors. Examples of lithium-containing phosphate compounds having a NASICON structure include Li ｘ M ｙ (PO 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)) can be mentioned. As an example of a lithium-containing phosphate compound having a NASICON structure, for example, Li １．２ Al ０．２ Ti １．８ (PO ４ ) ３ , etc. can be mentioned. As an example of an oxide having a perovskite structure, La ０．５５ Li ０．３５ TiO ３ , etc. can be mentioned. As an example of an oxide having a garnet-type or garnet-type similar structure, Li ７ La ３ Zr ２ O １２ , etc. can be mentioned.

[0043] Further, examples of the sulfide-based crystalline material include thio-LISICON, for example, Li ３．２５ Ge ０．２５ P ０．７５ S ４ and Li １０ GeP ２ S １２ and the like. The crystalline solid electrolyte may contain a polymer material (e.g., polyethylene oxide (PEO), etc.).

[0044] Examples of the glass-based solid electrolyte include an oxide-based glass material and a sulfide-based glass material. As the oxide-based glass material, for example, 50Li ４ SiO ４ ·50Li ３ BO ３ and the like can be mentioned. Further, as the sulfide-based glass material, for example, 30Li ２ S·26B ２ S ３ ·44LiI, 63Li ２ S·36SiS ２ ·1Li ３ PO ４ , 57Li ２ S·38SiS ２ ·5Li ４ SiO ４ , 70Li２ S・30P ２ S ５ and 50Li ２ S-50GeS ２ These are some examples.

[0045] 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 phosphate compounds (LATP) containing lithium, aluminum, and titanium as constituent elements, or phosphate compounds (LAGP) containing lithium, aluminum, and germanium as constituent elements. Examples of LATP include Li １．０７ Al ０．６９ Ti １．４６ (PO ４ ) ３ These are some examples. Also, as for LAGP, for example, Li １．５ Al ０．５ Ge １．５ (PO ４ ) are some examples.

[0046] Furthermore, examples of sulfide-based glass ceramic materials include Li ７ P ３ S １１ and Li ３．２５ P ０．９５ S ４ These are some examples.

[0047] Furthermore, examples of solid electrolytes capable of conducting sodium ions include sodium-containing phosphate compounds having a nasicone structure, oxides having a perovskite structure, and oxides having a garnet-type or garnet-type-like structure. Examples of sodium-containing phosphate compounds having a nasicone structure include Na ｘ M ｙ (PO ４ ) ３ Examples include (1 ≤ x ≤ 2, 1 ≤ y ≤ 2, and M is at least one selected from the group consisting of Ti, Ge, Al, Ga, and Zr).

[0048] -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 layer (positive electrode layer 112 and negative electrode layer 114).

[0049] (End face electrodes) The end face electrodes 120 are arranged on the end face of the solid battery stack 110, which has a substantially rectangular shape. The end face electrodes 120 may also be arranged on a part of the side surface of the solid battery stack 110.

[0050] The end electrode 120 preferably contains a conductive material with high conductivity. The material constituting the end electrode 120 is not particularly limited, but examples include at least one selected from the group consisting of silver, gold, palladium, platinum, aluminum, copper, tin, carbon, and nickel.

[0051] (Base) The base 200 has a first main surface 212 facing the solid battery 100, a second main surface 214 facing the first main surface 212, and a side surface 216 extending in a direction intersecting the first main surface 212 and the second main surface 214, for example, in a perpendicular direction. The side surface 216 can also be understood as a surface connecting the first main surface 212 and the second main surface 214.

[0052] The first main surface 212 of the base 200 is the surface facing the solid-state battery 100. The first main surface 212 may have a larger planar size than the main surface of the solid-state battery 100 facing the first main surface 212. A circuit pattern 730 is arranged on the base 200. The circuit pattern 730 may be arranged on the first main surface 212 of the base 200. The circuit pattern 730 is electrically connected to the solid-state battery by a connection structure described later. The base 200 is also provided with external mounting terminals 780 for mounting the solid-state battery package in an area that is not covered by the outer casing and is exposed to the outside. The external mounting terminals 780 may be located on the second main surface 214 of the base 200. The external mounting terminals 780 enable electrical connection with other electronic components located outside the solid-state battery package 1000. The external mounting terminals 780 are electrically connected to the circuit pattern 730. For example, a circuit pattern 730 arranged on the first main surface 212 and an external mounting terminal 780 located on the second main surface 214 may be electrically connected via a via 750 that penetrates the base 200. This structure allows the solid battery 100 located inside the outer casing 400 and other electronic components located outside the solid battery package 1000 to be electrically connected via the external mounting terminal 780, etc.

[0053] The base portion 200 can also be understood as a substrate equipped with external mounting terminals 780 for the packaged solid battery. In other words, the base portion can be said to be a terminal substrate for the external mounting terminals 780. A solid battery package equipped with such a base portion 200 can be mounted on another secondary substrate, such as a printed circuit board, with the base portion 200 interposed between them. For example, the solid battery can be surface mounted via the substrate through solder reflow. For this reason, the solid battery package of this disclosure is preferably an SMD (Surface Mount Device) type battery package.

[0054] The base portion 200, together with the outer casing 400, surrounds the solid-state battery 100, thereby preventing the solid-state battery 100 from being exposed to the outside. This suppresses the ingress of moisture into the solid-state battery 100. From the viewpoint of suitably suppressing such moisture ingress, the base portion 200 may further include a metal layer that extends in a direction substantially horizontal to the first main surface 212 and is not electrically connected to the circuit pattern 730. As shown in Figure 2, the base portion 200 may have a main surface larger than, for example, the solid-state battery.

[0055] (Insulating Coating Layer) An insulating coating layer 300 may be provided between the solid battery 100 and the casing 400. The insulating coating layer 300 is a layer made of an insulating material. Examples of insulating materials for the insulating coating layer 300 include resin. The thickness of the insulating coating layer 300 is, for example, 0.1 to 50 μm. The insulating coating layer 300 covers the solid battery 100 and is interposed between the outer surface 130 of the solid battery 100 and the inner surface 420 of the casing 400, electrically insulating the two components. Alternatively, as shown in Figure 4, a space may be provided between the casing 400 and the solid battery. With this configuration, electrical insulation between the solid battery 100 and the metal casing 400 can be ensured.

[0056] (Outer casing) The outer casing 400 covers the solid battery 100 and seals the solid battery 100 by joining it to the base 200. The thickness of the outer casing 400 is, for example, 10 μm to 200 μm.

[0057] <First Embodiment> Based on the basic configuration of the solid battery package 1000 described above, the features of the first embodiment will be described below.

[0058] As shown in Figure 3, in the solid battery package 1000 of this disclosure, the solid battery 100 is electrically connected to the external mounting terminals 780 via a battery mounting section 720 on which the solid battery 100 is mounted, and a circuit pattern 730 extending from the battery mounting section 720 to the base 200. The battery mounting section 720 may be a conductive member located in a region different from the first main surface 212 of the base 200, and may also be referred to as a battery mounting electrode. The battery mounting section 720 may be spaced apart from the base 200. The battery mounting section 720 is electrically connected to the end face electrodes 120 of the solid battery 100. The circuit pattern 730 is connected to the battery mounting section 720 and extends to the base 200. The battery mounting section 720 may be positioned between the circuit pattern 730 and the solid battery 100.

[0059] In this connection structure, the solid battery 100 is mounted on the battery mounting section 720 in a region different from the region facing the base 200. In short, the solid battery 100 is mounted within the casing 400 in a region different from the first main surface 212 of the base 200. That is, unlike conventional structures in which the solid battery 100 is directly mounted to a connection element (e.g., a circuit pattern) located on the base 200 (for example, the structure described in Patent Document 1), in this disclosure, the solid battery 100 is mounted in a region different from the base 200. This structure can be considered as a structure in which the solid battery 100 is indirectly connected to the base 200.

[0060] In this structure, the solid battery 100 is electrically connected to the circuit pattern 730 via a battery mounting portion 720 located in a region different from the region between the solid battery 100 and the base 200, without being directly joined to the base 200. Therefore, the base 200 is not constrained by joining to the solid battery 100. As described above, the solid battery 100 can expand and contract during charging and discharging. If the base 200 is joined to the solid battery 100, stress acts on the base 200 as the solid battery 100 expands and contracts, and the load on the base 200 may, in some cases, cause damage to the base 200. In the solid battery package of this disclosure, the base 200 is not constrained by joining (fixing) to the solid battery 100, so the effects of the expansion and contraction of the solid battery 100 can be reduced or avoided. Therefore, the stress caused by expansion and contraction acting on the base 200 can be alleviated. This suppresses damage to the base 200 when the solid battery is repeatedly charged and discharged, and the solid battery package can have a longer lifespan.

[0061] The battery mounting portion 720 may function as a conductive bonding agent that electrically connects the end face electrodes 120 of the solid battery 100 to the circuit pattern 730. For this reason, the battery mounting portion 720 may also be called a battery bonding portion. The battery mounting portion 720 may be a conductive adhesive, for example, an epoxy-based conductive adhesive containing a metal filler such as Ag. The battery mounting portion 720 can be provided by printing a conductive paste that does not require cleaning with flux or the like after formation, such as a conductive paste (for example, Ag conductive paste), nanopaste, alloy-based paste, or brazing material.

[0062] The circuit pattern 730 and the external mounting terminal 780 may be electrically connected via a conductor passing through the inside of the base 200. The solid battery package 1000 may further include vias 750 that electrically connect the circuit pattern 730 and the external mounting terminal 780. In other words, the circuit pattern 730 and the external mounting terminal 780 may be electrically connected via vias 750. The vias 750 may extend so as to pass through the inside of the base 200. In one embodiment, the vias 750 may penetrate the base 200. As described above, according to this disclosure, the stress generated in the base 200 during charging and discharging can be reduced. As a result, the stress generated in the vias 750 passing through the base 200 is also reduced, and thus damage to the vias 750 can be suppressed. Therefore, according to this disclosure, a solid battery package with excellent connection reliability can be obtained even in a structure that includes vias 750.

[0063] The materials of the circuit pattern 730, via 750, and external mounting terminal 780 may be mainly conductive metallic materials. Examples of metallic materials include silver, palladium, gold, platinum, aluminum, copper, and / or nickel. The circuit pattern 730, via 750, and external mounting terminal 780 may be made of the same material, or they may be made of different materials.

[0064] A portion of the circuit pattern 730 may be located on the first main surface 212 of the base 200. The circuit pattern 730 may be connected to the battery mounting section 720 and extend from the battery mounting section to the first main surface 212 of the base 200. A portion of the circuit pattern 730 extending from the battery mounting section 720 may be arranged on the first main surface 212 of the base 200. The circuit pattern 730 located on the first main surface 212 may be electrically connected to the external mounting terminal 780 via vias 750 or the like. With this structure, the impact on the base 200 due to the expansion and contraction of the solid battery 100 can be reduced, while shortening the connection circuit from the solid battery 100 to the external mounting terminal 780 (the distance passing through the battery mounting section 720, the circuit pattern 730, and the vias 750). This makes it possible to suppress power loss by reducing resistance and to miniaturize the solid battery package.

[0065] The circuit pattern 730 may include multiple parts that extend in different directions from each other in a cross-sectional view. For example, as shown in Figure 3, the circuit pattern may include a first part 731 arranged on the first main surface of the base 200 and a second part 733 that extends in a direction intersecting the direction of extension of the first part 731. That is, the second part 733 may extend along a direction intersecting the first main surface 212 of the base 200. In this specification, "direction intersecting a surface" means a direction intersecting the in-plane direction of the surface, and includes both directions perpendicular to the surface and directions oblique to the surface. For example, as shown in Figure 3, if the first main surface 212 is an X-Y plane extending in the X and Y directions (also referred to as the "X-Y direction"), the second part 733 may extend along a direction intersecting the direction of extension of the first main surface 212 (X-Y direction). In one embodiment, the extension direction of the second portion 733 may be perpendicular to the first main surface 212 of the base portion 200. That is, the second portion 733 may extend along the direction normal to the first main surface 212 of the base portion 200.

[0066] The circuit pattern 730 may include a first portion 731 extending along the first main surface 212 of the base portion 200 and a second portion extending along the inner surface 420 of the outer casing 400. The circuit pattern 730 may be connected to the battery mounting portion 720 at the second portion 733. In cross-sectional view, the circuit pattern 730 may include a curved portion that bends from the first portion 731 to the second portion 733. The curved portion may be bent, folded, or curved in cross-sectional view. For example, as shown in Figure 3, the circuit pattern 730 may include a substantially L-shaped portion in cross-sectional view.

[0067] In a plan view, the planar shape of the first portion 731 of the circuit pattern 730 is not particularly limited and may have various shapes. The circuit pattern 730 is not particularly limited, but may have various planar shapes such as linear, curved, folded, grid-like, or annular.

[0068] An insulating layer 500 may be present between the circuit pattern 730 and the outer casing 400. The insulating layer 500 may extend to cover the inner surface 420 of the outer casing 400. The insulating layer 500 may be in contact with the base 200. In such a structure, the circuit pattern 730 may extend from the base 200 to the insulating layer 500. This structure provides insulation between the outer casing 400 and the circuit pattern 730.

[0069] The main material of the insulating layer 500 may be resin, ceramic, or glass. The insulating layer 500 may be made of the same material as the base 200, or it may be made of different materials. For example, the base 200 and the insulating layer 500 may be a continuous, integrated structure.

[0070] The outer casing 400 includes an inner surface 420 that extends to surround the solid battery 100. The battery mounting section 720 may be located on the inner surface 420 side of the outer casing 400. As shown in Figure 3, the battery mounting section 720 may extend along the inner surface 420 of the outer casing 400. The battery mounting section 720 may extend in a direction intersecting the first main surface 212 of the base 200, or it may extend in a direction parallel to the first main surface 212. Specifically, the battery mounting section 720 may be located on the inner surface side of the inner surface 420 of the outer casing 400 that extends in a direction different from the first main surface 212 of the base 200 (for example, the Z direction), or it may extend in a direction substantially parallel to the first main surface 212 and be located on the inner surface side (hereinafter also referred to as the top surface) that is on the opposite side of the base 200 with the solid battery 100 in between.

[0071] The battery mounting section 720 has a main surface 722 facing the solid battery 100. The main surface 722 of the battery mounting section 720 and the end face electrodes of the solid battery 100 may be directly joined. Preferably, the main surface 722 of the battery mounting section 720 may extend in a direction intersecting the first main surface 212 of the base 200. The battery mounting section 720 may extend along the inner surface 420 of the outer casing 400. More preferably, the battery mounting section 720 may extend in a direction perpendicular to the first main surface 212 of the base 200. The solid battery 100 may be mounted on the battery mounting section 720 with a side surface extending in a direction intersecting the first main surface 212 of the base 200. The mounting interface (joint surface) between the solid battery 100 and the battery mounting section 720 may extend in a direction intersecting the first main surface 212 of the base 200.

[0072] The base portion 200 may have a structure that is exposed from the outer casing 400 in at least the region where the external mounting terminals 780 are located, and is therefore susceptible to external environmental influences. In some cases, the base portion 200 may deform due to external influences (e.g., temperature changes). According to the above structure, the battery mounting portion 720 extends in a direction different from the extending direction of the base portion 200. Therefore, even if the base portion 200 deforms, deformation in the battery mounting portion 720 can be suppressed by this deformation. In other words, even if the base portion 200 deforms, the impact of this deformation on the joint between the solid battery 100 and the battery mounting portion 720 can be reduced. This makes it possible to maintain a more favorable connection state between the solid battery 100 and the battery mounting portion 720. That is, a solid battery package with superior connection reliability can be obtained.

[0073] As shown in Figures 2 and 3, the solid battery package 1000 does not need to have a joining member to connect the solid battery 100 and the base 200 in a cross-sectional view. In other words, the first main surface 212 of the base 200 and the main surface of the solid battery 100 facing the first main surface 212 do not need to be fixed by a joining member. For example, the solid battery 100 and the base 200 may be in contact with each other without being fixed, or they may not be in contact at all. Preferably, in a cross-sectional view, the solid battery 100 and the first main surface 212 of the base 200 may be spaced apart from each other. For example, an insulating material may be present between the solid battery 100 and the base 200. Alternatively, as shown in Figure 4, a space may exist between the solid battery 100 and the base 200.

[0074] According to the above-described structure, even when the solid-state battery 100 expands and contracts, the influence that the base portion 200 may experience due to such expansion and contraction can be reduced. For example, even when the solid-state battery 100 expands and contracts, since the solid-state battery 100 and the base portion 200 are not joined, deformation of the base portion 200 that follows the expansion and contraction of the solid-state battery 100 can be suppressed. As a result, the stress on the base portion 200 acting due to the expansion and contraction of the solid-state battery 100 can be suitably relieved.

[0075] The solid-state battery package 1000 comprises a plurality of battery mounting sections 720. Specifically, the solid-state battery package 1000 comprises a positive electrode mounting section joined to the positive electrode end face electrode 120 of the solid-state battery 100, and a negative electrode mounting section joined to the negative electrode end face electrode 120. The positive electrode mounting section 720 is electrically connected to the positive electrode external mounting terminal 780 via a positive electrode circuit pattern 730 and a positive electrode via 750. Similarly, the negative electrode mounting section 720 is electrically connected to the negative electrode external mounting terminal 780 via a negative electrode circuit pattern 730 and a negative electrode via 750.

[0076] Each of these multiple battery mounting sections 720 may be located on one of the multiple inner surfaces 420 of the outer casing 400. For example, each of the multiple battery mounting sections 720 may be located on different inner surfaces 420. As shown in Figure 5, each of two battery mounting sections 720 may be provided on opposite inner surfaces 420. Preferably, each of the multiple battery mounting sections 720 may be located on the same inner surface (see Figure 4). Each of the multiple battery mounting sections 720 may be located on the same plane. With this structure, the joints between the multiple battery mounting sections 720 and the solid battery 100 are located on the same plane of the solid battery 100. Because the joints are located on the same plane of the solid battery 100, the solid battery 100 is not constrained from multiple directions by the joints with the battery mounting sections 720. Therefore, when the solid battery 100 expands and contracts, the stress that can act on the joint between the solid battery 100 and the battery mounting section 720 may be reduced. This can improve the reliability of the connection between the solid battery 100 and the battery mounting section 720.

[0077] As described above, the solid-state battery package 1000 of this disclosure can have a structure in which the base 200 is not constrained by direct bonding with the solid-state battery 100. This can reduce the load on the base 200 caused by the expansion and contraction of the solid-state battery 100. For this reason, a material with relatively lower stress relaxation properties and higher rigidity than resin can be used as the material for the base 200. For example, the main material of the base 200 may be resin, or it may be ceramic or glass. In short, the base 200 may be made of a material similar to those that fall into the category of printed circuit boards, flexible circuit boards, LTCC circuit boards, glass circuit boards, or HTCC circuit boards. According to this disclosure, since the stress on the base 200 caused by the expansion and contraction of the solid-state battery 100 is relieved, even when the above-mentioned materials are used, the occurrence of cracks in the base 200 caused by expansion and contraction can be suitably suppressed.

[0078] If the base portion 200 is made of resin, the base portion 200 may be a plate-like member configured to include resin as a base material, for example, a laminated structure containing a resin layer. The resin material of such a resin layer may be any thermoplastic resin and / or any thermosetting resin. Furthermore, the resin layer may be constructed, for example, by impregnating a glass fiber cloth with a resin material such as epoxy resin.

[0079] The exterior body 400 may be a metal exterior body. Examples of metals that make up the exterior body 400 include metals selected from the group consisting of copper, copper alloys, nickel, nickel alloys, aluminum, aluminum alloys, carbon steel, stainless steel (SUS), alloy tool steel, structural alloy steel, high-tensile steel, and cemented carbide.

[0080] In this specification, copper alloy refers to an alloy with copper as the main component and other metallic elements added (e.g., brass, bronze, cupronickel, beryllium copper, lead brass, lead bronze, etc.). In this specification, nickel alloy refers to an alloy with nickel as the main component and other metallic elements added (e.g., iron, chromium, molybdenum, cobalt, etc.). In this specification, aluminum alloy refers to an alloy with aluminum as the main component and other metallic elements added (e.g., copper, magnesium, silicon, zinc, etc.). In this specification, carbon steel refers to iron-based steel with carbon as the main alloying element. In this specification, SUS refers to stainless steel as defined in, for example, "JIS G 0203 Steel Terminology," and may be an alloy steel containing chromium or chromium and nickel. In this specification, alloy tool steel refers to steel to which alloying elements such as chromium, tungsten, molybdenum, and vanadium have been added to the carbon steel described above. In this specification, structural alloy steel refers to steel to which alloying elements such as chromium, nickel, molybdenum, and manganese have been added to carbon steel. In this specification, high-tensile steel refers to steel with a tensile strength of 490 MPa or higher. In this specification, cemented carbide refers to alloys in which carbides of metals from groups IVa, Va, and VIa of the periodic table have been sintered with iron-based metals such as iron, cobalt, and nickel.

[0081] As described above, the outer casing 400 may seal the solid battery 100 by joining it to the base 200. If the outer casing 400 is made of a metal material, it is possible to enhance the effect of suppressing the intrusion of moisture into the solid battery 100 housed inside, compared to the case where the outer casing 400 is made of a resin material. On the other hand, if the outer casing 400 is made of a metal material, when the base 200 deforms due to the expansion and contraction of the solid battery 100, the outer casing may not be able to adequately follow the deformation of the base 200, and damage may occur due to stress generated at the joint between the outer casing 400 and the base 200, potentially resulting in a sealing failure. According to this disclosure, since the deformation of the base 200 when the solid battery 100 expands and contracts is suppressed, a suitable sealing state can be maintained even when a metal outer casing is used.

[0082] <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 it comprises a plurality of base portions 200.

[0083] Figure 6 is a schematic cross-sectional view showing the A-A section of the solid battery package 1000 according to the second embodiment. Figure 7 is a schematic cross-sectional view showing the B-B section of the solid battery package 1000 according to the second embodiment. Figure 8 is a schematic cross-sectional view showing the C-C section of the solid battery package 1000 shown in Figure 6.

[0084] As shown in Figures 6 to 8, the solid battery package 1000 may have a plurality of bases 200. The plurality of bases 200 may be arranged so as to face different sides of the solid battery 100. Each of the plurality of bases 200 has an external mounting terminal 780. Each of the external mounting terminals 780 may be electrically connected to a different battery mounting section 720. For example, the plurality of bases 200 may include a base 200 having a positive electrode external mounting terminal 780 and a base 200 having a negative electrode external mounting terminal 780. The positive electrode external mounting terminal 780 may be electrically connected to the positive electrode mounting section 720. The negative electrode external mounting terminal 780 may be electrically connected to the negative electrode mounting section 720. In the solid battery package 1000 of this disclosure, the solid battery 100 is mounted on the battery mounting section 720, not on the bases 200. Therefore, the base 200, which is equipped with external mounting terminals 780, can be placed at any position, regardless of where the solid battery 100 is mounted.

[0085] For example, the multiple base portions 200 may extend in different directions from each other, or they may be arranged facing each other with the solid battery 100 in between, as shown in Figures 6 to 8. Specifically, the multiple battery mounting portions 720 may be arranged on the same side of the solid battery 100 and electrically connected to each of the different base portions 200 via the circuit pattern 730. This allows the solid battery package 1000 to be mounted on electronic components with various structures (for example, integrated circuits with a three-dimensional structure).

[0086] <Third Embodiment> The solid-state battery package according to the third embodiment differs from the solid-state battery package 1000 according to the first embodiment in the stacking direction of the electrode layers in the solid-state battery 100.

[0087] Figure 9 is a schematic cross-sectional view showing the A-A section of the solid battery package 1000 according to the third embodiment. Figure 10 is a schematic cross-sectional view showing the B-B section of the solid battery package according to the third embodiment.

[0088] As described above, the solid battery 100 comprises a solid battery laminate 110 in which battery component units, each including a positive electrode layer 112, a negative electrode layer 114, and a solid electrolyte layer 116, are stacked. The stacking direction of the battery component units may be substantially parallel to the first main surface 212 of the base portion 200. The positive electrode layer 112, the negative electrode layer 114, and the solid electrolyte layer 116 may extend substantially perpendicular to the first main surface 212 of the base portion 200. In one embodiment, the stacking direction of the battery component units may be different from the extending direction of the battery mounting portion 720. Specifically, the stacking direction of the battery component units may be in a direction intersecting the main surface of the battery mounting portion 720. In other words, the positive electrode layer 112, the negative electrode layer 114, and the solid electrolyte layer 116 may be stacked along a direction intersecting the main surface of the battery mounting portion 720. For example, the stacking direction of the battery component units may be in a direction perpendicular to the main surface of the battery mounting portion 720.

[0089] Generally, a solid-state battery 100 can expand and contract in the stacking direction of the battery components during charging and discharging. With the above-described structure, since the stacking direction of the battery components and the first main surface 212 of the base 200 are substantially parallel, the expansion and contraction direction of the solid-state battery 100 and the first main surface 212 of the base 200 are substantially parallel. As a result, even when the solid-state battery 100 expands and contracts, deformation of the base 200 that follows the expansion and contraction is suitably suppressed. Therefore, the stress generated in the base 200 due to the expansion and contraction of the solid-state battery 100 can be reduced.

[0090] [Method for Manufacturing a Solid Battery Package] An embodiment of the method for manufacturing a solid battery package according to the first embodiment will be described with reference to Figures 11A to 11F. Figures 11A to 11F are schematic diagrams illustrating the manufacturing process of a solid battery package according to the first embodiment.

[0091] In the following, one manufacturing method is described as an example for better understanding of this disclosure, but this disclosure is not limited to that method. Furthermore, the order of description and other chronological matters below are merely for explanatory purposes and are not necessarily binding.

[0092] The solid battery package 1000 may include a step of preparing a precursor including a base 200 and part of the outer casing (precursor preparation step), preparing a solid battery 100 (battery preparation step), mounting the solid battery 100 (installation) (solid battery mounting step), and sealing the solid battery 100 with the outer casing 400 (sealing step).

[0093] (Precursor Preparation Process) Figure 11A is a schematic plan view showing a precursor including a region corresponding to the base 200 and a region corresponding to the insulating layer 500. Figures 11B to 11F are schematic cross-sectional views showing the A-A cross section in Figure 11A and the corresponding B-B cross section. A plate-shaped insulating material is prepared including a region corresponding to the precursor base 200 and a region corresponding to the insulating layer 500, and the first outer casing 401 is provided in the region corresponding to the insulating layer 500. On the surface opposite to the surface on which the first outer casing 401 is provided, a circuit pattern is formed extending from the base 200 to the insulating layer 500. The planar shape of the circuit pattern is not particularly limited and may have any shape, such as linear, rectangular, polygonal, curved, or irregular.

[0094] While not particularly limited, when resin materials are used for the base 200 and insulating layer 500, their preparation may be carried out by laminating multiple layers and subjecting them to heating and pressurizing treatment. For example, a precursor can be formed using a resin sheet constructed by impregnating a fibrous cloth, which serves as the base material, with a resin raw material. After the formation of the base precursor, this base precursor is subjected to heating and pressurizing in a press machine. On the other hand, when ceramic materials are used for the base 200 and insulating layer 500, their preparation may be carried out, for example, by forming a green sheet laminate by heat-pressing multiple green sheets, and then firing the green sheet laminate after the bending process described later to obtain a ceramic base and insulating layer. The preparation of the ceramic base or insulating layer can be carried out, for example, in accordance with the manufacturing of an LTCC substrate. For example, holes can be formed in a green sheet using a punch press or a carbon dioxide laser, and conductive paste material can be filled into the holes, or precursors for conductive parts such as vias 750, circuit patterns 730, and external mounting terminals 780 can be formed by performing a printing method or the like. Furthermore, the conductive portion can also be formed after the firing of the green sheet laminate.

[0095] Next, the precursor, comprising the base 200 and the insulating layer 500, is folded inward at the boundary between the base 200 and the insulating layer 500 (dashed line V) so that the circuit pattern 730 faces inward (Figure 11C). In other words, the surface comprising the circuit pattern 730 is bent inward at the boundary V between the base 200 and the insulating layer 500. Specifically, it may be folded so that the direction of extension of the insulating layer 500 intersects (for example, is approximately perpendicular to) the direction of extension of the base 200. If the base 200 and the insulating layer 500 include ceramic or glass, they may be fired after folding.

[0096] Subsequently, a battery mounting section 720 may be provided in the circuit pattern 730 located on the insulating layer 500 (Figure 11D). The battery mounting section 720 may also be provided in the circuit pattern 730 before the precursor is folded.

[0097] (Battery preparation process) In the preparation process, for example, a solid-state battery 100 is prepared by manufacturing or purchasing.

[0098] (Solid-state battery mounting process) In the solid-state battery mounting process, as shown in Figure 11E, the solid-state battery 100 is mounted (placed and fixed) on the battery mounting section 720. As a result, the end face electrodes 120 of the solid-state battery 100 are electrically connected to the external mounting terminals 780 located on the second main surface 214 of the base 200 via the battery mounting section 720, the circuit pattern 730, and the vias 750. Note that the solid-state battery mounting process may be performed before the precursor is bent.

[0099] (Sealing Process) In the sealing process, as shown in Figure 11F, a second outer casing 402 is provided so as to cover the mounted solid battery 100 and to be joined to the base 200. The second outer casing 402 is combined with the first outer casing 401, which was provided on the insulating layer 500 in the precursor preparation process, and joined to each other. The joining method is not particularly limited and may be done by welding, for example. The first outer casing 401 and the second outer casing 402 form an outer casing 400 that seals the solid battery 100. In other words, the solid battery 100 may be sealed by an outer casing 400 formed by combining the first outer casing 401 and the second outer casing 402.

[0100] This completes the solid-state battery package described herein.

[0101] The embodiments of this disclosure have been described above, but these are merely typical examples. Those skilled in the art will readily understand that this disclosure is not limited thereto, and various embodiments are conceivable without altering the essence of this disclosure.

[0102] One embodiment of the present disclosure as described above encompasses the following preferred embodiments: <1> A solid battery package comprising a base having external mounting terminals, a solid battery disposed opposite the main surface of the base, and an outer casing for sealing the solid battery, wherein the external mounting terminals and the solid battery are electrically connected via a battery mounting portion on which the solid battery is mounted, and a circuit pattern connected to the battery mounting portion and extending to the base, and the solid battery is joined to the battery mounting portion in a region different from the region of the base facing the main surface. <2> The solid battery package according to <1>, wherein a part of the circuit pattern is located on the main surface of the base, and the external mounting terminals are located on the surface of the base opposite to the main surface. <3> The solid battery package according to <1> or <2>, wherein the circuit pattern and the external mounting terminals are electrically connected via vias passing through the interior of the base. <4> The solid battery package according to any one of <1> to <3>, wherein the battery mounting portion is located between the solid battery and the outer casing. <5> The solid battery package according to any one of <1> to <4>, wherein the main surface of the battery mounting portion extends along a direction intersecting the main surface of the base. <6> The solid battery package according to any one of <1> to <5>, wherein the main surface of the battery mounting portion extends along a direction perpendicular to the main surface of the base. <7> The solid battery package according to any one of <1> to <6>, wherein the circuit pattern includes a first portion extending along the main surface of the base and a second portion extending along a direction intersecting the main surface, and the second portion is connected to the battery mounting portion. <8> The solid battery package according to any one of <1> to <7>, wherein, in cross-sectional view, there is no joining member between the main surface of the base and the solid battery that joins the main surface and the solid battery together. <9> The solid battery package according to any one of <1> to <8>, wherein, in cross-sectional view, the base and the solid battery are separated from each other. <10> The solid battery package according to <9>, wherein a space is provided between the base and the solid battery in a cross-sectional view.<11> The solid battery package according to any one of <1> to <10>, wherein the solid battery comprises a negative end face electrode and a positive end face electrode, the battery mounting portion includes a negative electrode mounting portion electrically connected to the negative end face electrode and a positive electrode mounting portion electrically connected to the positive end face electrode, the solid battery comprises a plurality of sides facing the outer casing, and the negative electrode mounting portion and the positive electrode mounting portion are positioned on the same side. <12> The solid battery package according to any one of <1> to <11>, comprising a plurality of battery mounting portions and a plurality of base portions, each of the plurality of base portions is arranged to face a different side of the solid battery, and each of the plurality of battery mounting portions is electrically connected to the external mounting terminals of different base portions among the plurality of base portions. <13> The solid battery package according to <12>, wherein, in cross-sectional view, the plurality of base portions are arranged facing each other with the solid battery in between. <14> The solid battery package according to any one of <1> to <13>, wherein the solid battery comprises a laminate formed by stacking battery component units, each including a positive electrode layer, a negative electrode layer, and a solid electrolyte layer located between the positive electrode layer and the negative electrode layer, and the stacking direction of the battery component units is in a direction along the main surface of the base. <15> The solid battery package according to <14>, wherein the stacking direction of the battery component units is in a direction intersecting the main surface of the battery mounting portion. <16> The solid battery package according to any one of <1> to <15>, wherein the main material of the base is ceramic, resin, or glass. <17> The solid battery package according to any one of <1> to <16>, wherein the outer casing is made of a metallic material selected from copper, copper alloy, nickel, nickel alloy, aluminum, aluminum alloy, carbon steel, stainless steel (SUS), alloy tool steel, machine structural alloy steel, high-tensile steel, and cemented carbide.

[0103] It should be noted that the effects described above are merely examples. Therefore, this disclosure is not limited to the matters described above, and there may be additional effects.

[0104] The solid-state battery package described herein can be used in applications where the utilization of electrical energy is typically required. For example, the solid-state battery package described herein can be used in various fields where energy storage is anticipated. While these are merely examples, the (secondary) batteries of this disclosure can be used in the electrical, information, and communication fields where electrical and electronic equipment is used (e.g., the electrical and electronic equipment field or mobile device field, including mobile phones, smartphones, laptops and digital cameras, activity trackers, ARM computers, electronic paper, wearable devices, and small electronic devices such as RFID tags, card-type electronic money, and smartwatches), household and small industrial applications (e.g., power tools, golf carts, household, caregiving, and industrial robots), large industrial applications (e.g., forklifts, elevators, and port cranes), transportation systems (e.g., hybrid vehicles, electric vehicles, buses, trains, electric assist bicycles, electric motorcycles, etc.), power grid applications (e.g., various power generation systems, road conditioners, smart grids, and general household energy storage systems), medical applications (medical equipment such as earphones and hearing aids), pharmaceutical applications (medication management systems, etc.), as well as IoT applications and space and deep-sea applications (e.g., space probes, submersible research vessels, etc.).

[0105] 1000 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 Base 212 First main surface 214 Second main surface 216 Side surface 300 Insulating coating layer 400 Outer casing 401 First outer casing 402 Second outer casing 420 Inner surface 430 Outer surface 500 Insulating layer 720 Battery mounting section 730 Circuit pattern 750 Via 780 External mounting terminal

Claims

1. A solid battery package comprising a base portion having external mounting terminals, a solid battery disposed opposite the main surface of the base portion, and an outer casing for sealing the solid battery, wherein the external mounting terminals and the solid battery are electrically connected via a battery mounting portion to which the solid battery is joined, and a circuit pattern connected to the battery mounting portion and extending to the base portion, and the solid battery is joined to the battery mounting portion in a region different from the region of the base portion facing the main surface.

2. The solid battery package according to claim 1, wherein a portion of the circuit pattern is located on the main surface of the base, and the external mounting terminals are located on the surface of the base opposite to the main surface.

3. The solid battery package according to claim 1 or 2, wherein the circuit pattern and the external mounting terminals are electrically connected via vias passing through the interior of the base.

4. The solid battery package according to any one of claims 1 to 3, wherein the battery mounting portion is located between the solid battery and the outer casing.

5. The solid battery package according to any one of claims 1 to 4, wherein the main surface of the battery mounting portion extends along a direction intersecting the main surface of the base portion.

6. The solid battery package according to any one of claims 1 to 5, wherein the main surface of the battery mounting portion extends along a direction perpendicular to the main surface of the base portion.

7. The solid battery package according to any one of claims 1 to 6, wherein the circuit pattern includes a first portion extending along the main surface of the base and a second portion extending in a direction intersecting the main surface, and the second portion is connected to the battery mounting portion.

8. A solid battery package according to any one of claims 1 to 7, wherein, in a cross-sectional view, there is no joining member between the main surface of the base and the solid battery that joins the main surface and the solid battery to each other.

9. The solid battery package according to any one of claims 1 to 8, wherein, in a cross-sectional view, the base and the solid battery are separated from each other.

10. The solid battery package according to claim 9, wherein a space is provided between the base and the solid battery in a cross-sectional view.

11. The solid battery package according to any one of claims 1 to 10, wherein the solid battery comprises a negative end electrode and a positive end electrode, the battery mounting portion includes a negative electrode mounting portion electrically connected to the negative end electrode and a positive electrode mounting portion electrically connected to the positive end electrode, the solid battery comprises a plurality of sides facing the outer casing, and the negative electrode mounting portion and the positive electrode mounting portion are positioned on the same side.

12. A solid battery package according to any one of claims 1 to 11, comprising a plurality of battery mounting sections and a plurality of base sections, each of the plurality of base sections being arranged to face different sides of the solid battery, and each of the plurality of battery mounting sections being electrically connected to the external mounting terminals of different base sections among the plurality of base sections.

13. The solid battery package according to claim 12, wherein, in a cross-sectional view, the plurality of bases are arranged opposite each other with the solid battery in between.

14. The solid battery package according to any one of claims 1 to 13, wherein the solid battery comprises a laminate formed by stacking battery component units, each including a positive electrode layer, a negative electrode layer, and a solid electrolyte layer located between the positive electrode layer and the negative electrode layer, and the stacking direction of the battery component units is in a direction along the main surface of the base.

15. The solid battery package according to claim 14, wherein the stacking direction of the battery component units is in a direction that intersects the main surface of the battery mounting portion.

16. The solid battery package according to any one of claims 1 to 15, wherein the main material of the base is ceramic, resin, or glass.

17. The solid battery package according to any one of claims 1 to 16, wherein the exterior body is made of a metallic material selected from copper, copper alloy, nickel, nickel alloy, aluminum, aluminum alloy, carbon steel, stainless steel (SUS), alloy tool steel, structural alloy steel, high-tensile steel, and cemented carbide.

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