WO2020202928A1 - Solid state battery - Google Patents

Abstract

The object of the present invention is to provide a solid state battery which is mounted on a base board comprising a circuit and elements, for example, and with which failure of a connecting portion between a metal terminal and the base board can be adequately suppressed even if charging and discharging occur repeatedly. The present invention relates to a solid state battery 100A including a solid state battery main body portion 10 and two end surface electrodes 1 (1A, 1B), wherein: the solid state battery includes metal terminals 2 (2A or 2B) electrically connected to each of the two end surface electrodes 1 (1A, 1B); and the metal terminals 2 support the solid state battery main body portion provided with the end surface electrodes, while projecting toward the opposite side to the solid state battery main body portion 10 (in the Za direction or the Zb direction).

Description

Solid state battery

The present invention relates to a solid state battery.

In recent years, the demand for batteries as a power source for portable electronic devices such as mobile phones and portable personal computers has been increasing. In batteries used for such purposes, an electrolyte (electrolyte solution) such as an organic solvent has been conventionally used as a medium for moving ions. However, in the battery having the above configuration, there is a risk that the electrolytic solution may leak out. Further, the organic solvent and the like used in the electrolytic solution are flammable substances. Therefore, it is required to improve the safety of the battery.

Therefore, in order to improve the safety of batteries, research on solid-state batteries using solid electrolytes instead of electrolytes as electrolytes is underway.

The solid-state battery is, for example, a solid-state battery having a laminated structure in which one or more positive electrode layers and one or more negative electrode layers are alternately laminated via a solid electrolyte layer in Patent Documents 1 and 2. A solid-state battery having end face electrodes on its two opposite end faces is disclosed. Such a solid-state battery is mounted by electrically connecting metal terminals to each of the end face electrodes.

JP-A-2009-135834 WO2007 / 086219

However, when the inventor of the present invention repeatedly charges and discharges a solid-state battery after mounting it on a substrate such as a circuit and an element, the connection portion between the metal terminal and the substrate is destroyed, and the connection between the metal terminal and the substrate is broken. I found that defects are likely to occur.

Specifically, the solid-state battery has, for example, as shown in FIG. 14, a laminated structure in which one or more positive electrode layers 51 and one or more negative electrode layers 52 are alternately laminated via a solid electrolyte layer 53. A solid-state battery 500A is known, which has end face electrodes 501 (501A, 501B) on its end face. In the solid-state battery 500A, metal terminals 502 (502A, 502B) are electrically connected to each of the end face electrodes 501 (501A, 501B). The metal terminals 502 (502A, 502B) are provided on the surfaces of the end face electrodes 501A and 501B, and extend directly below (that is, directly below) as they are. At the time of mounting, the solid-state battery 500A is supported on the substrate 503 by such metal terminals 502 (502A, 502B) and electrically connected. In the solid-state battery 500A mounted in this way, when charging and discharging are repeated, the volume of the solid-state battery 500A (particularly the positive electrode layer 51 and the negative electrode layer 52) expands and contracts (particularly in the direction perpendicular to the stacking direction (left-right direction in the figure)). The stress generated by (expansion) is concentrated on the support points G'of the metal terminals 502A and 502B, the connection between the metal terminals 502A and 502B and the substrate 503 is broken relatively early, and the connection between the metal terminals and the substrate is poor. Happened. FIG. 14 is a schematic cross-sectional view of an example of a solid-state battery in the prior art.

In mounting the solid-state battery, more specifically, the metal terminals 502A and 502B are extended along the substrate 503 at the end portion on the substrate side and are electrically connected to the substrate 503. At this time, the metal terminals 502A and 502B may extend to the side opposite to the solid-state battery main body 510 as shown in FIG. 15 with respect to the end face electrodes 501A and 501B in cross-sectional view, or as shown in FIG. Even if it extends to the 510 side of the solid-state battery body, a poor connection between the metal terminal and the substrate still occurs. That is, the stress generated by the expansion and contraction (particularly expansion) of the volume of the solid-state battery (particularly the positive electrode layer and the negative electrode layer) is generated by the support points G'of the metal terminals 502A and 502B, the battery body 510, and the end face electrodes 501 (A, B). ) Concentrated on the interface, the connection part J'between the metal terminals 502A and 502B and the substrate 503 is destroyed relatively early, and the connection failure between the metal terminal and the substrate and the connection failure between the end face electrode and the battery internal electrode occur. It was. FIG. 15 is a simplified view of the solid-state battery shown in FIG. FIG. 16 is a schematic cross-sectional view of another example of a solid state battery in the prior art.

An object of the present invention is to provide a solid-state battery that can be mounted on a substrate such as a circuit and an element, and can more sufficiently suppress the destruction of the connection portion between the metal terminal and the substrate even if charging and discharging are repeated. ..

The present invention
A solid-state battery including a solid-state battery body and two end face electrodes.
The solid-state battery has metal terminals that are electrically connected to each of the two end face electrodes.
The metal terminal relates to a solid-state battery that supports the solid-state battery main body provided with the end face electrode while projecting to the side opposite to the solid-state battery main body.

The solid-state battery of the present invention is mounted on a substrate such as a circuit and an element, and even if charging and discharging are repeated, the destruction of the connection portion between the metal terminal and the substrate can be more sufficiently suppressed.

It is a schematic sectional view of the solid state battery which concerns on 1st Embodiment of this invention. It is a schematic sectional view of the solid state battery which concerns on 2nd Embodiment of this invention. It is a schematic sectional view of the solid state battery which concerns on 3rd Embodiment of this invention. It is a schematic sectional view of the solid-state battery which concerns on 4th Embodiment of this invention. It is a schematic sectional view of the solid-state battery which concerns on 5th Embodiment of this invention. It is a schematic sectional view of the solid-state battery which concerns on 6th Embodiment of this invention. It is a schematic sectional view of the solid state battery which concerns on 7th Embodiment of this invention. It is a schematic sectional view of the solid-state battery which concerns on 8th Embodiment of this invention. It is a schematic sectional view of the solid state battery which concerns on 9th Embodiment of this invention. It is a schematic plan view of the solid-state battery which concerns on 1st Embodiment of this invention. It is a schematic plan view of the modification of the solid-state battery which concerns on 1st Embodiment of this invention. It is a schematic cross-sectional view which shows an example when the solid-state battery of this invention (for example, the solid-state battery which concerns on 1st Embodiment of this invention) is distributed. It is a schematic cross-sectional view which shows an example when the metal terminal of this invention (for example, the metal terminal of the solid-state battery which concerns on 1st Embodiment of this invention) is distributed. It is a schematic cross-sectional view of an example of a solid-state battery in the prior art. It is a figure which showed more simplified the solid-state battery shown in FIG. It is a schematic sectional view of another example of the solid-state battery in the prior art.

[Solid-state battery]
The present invention provides a solid-state battery and metal terminals for mounting the solid-state battery. The term "solid-state battery" as used herein refers to a battery in which its components (particularly the electrolyte layer) are composed of solids in a broad sense, and in a narrow sense, the components (particularly all components) are composed of solids. Refers to the "all-solid-state battery" that is configured. The "solid-state battery" as used herein includes a so-called "secondary battery" capable of repeating charging and discharging, and a "primary battery" capable of only discharging. The "solid-state battery" is preferably a "secondary battery". The "secondary battery" is not overly bound by its name and may also include an electrochemical device such as a "storage device".

The term "plan view" as used herein refers to an object viewed from above or below (particularly above) along the stacking direction L (or the thickness direction of the solid-state battery) of the layers to be described later, which constitute the solid-state battery. It is a state (plan view, top view or bottom view). Further, the "cross-sectional view" referred to in the present specification is a cross-sectional state (cross-sectional view) when viewed from a direction substantially perpendicular to the stacking direction L (or the thickness direction of the solid-state battery) of each layer constituting the solid-state battery. That is. In particular, the cross-sectional view (or cross-sectional view) when explaining the metal terminal is a plane parallel to the stacking direction L and a plane passing through the two end face electrodes (particularly a straight line defining the distance between the two end face electrodes). It is a cross-sectional state (cross-sectional view) when a solid-state battery is cut on a parallel surface). The "vertical direction" and "horizontal direction" used directly or indirectly in the present specification correspond to the vertical direction and the horizontal direction in the drawings, respectively. Unless otherwise specified, the same code or symbol shall indicate the same member / part or the same meaning. In one preferred embodiment, it can be considered that the vertical downward direction (that is, the direction in which gravity acts) corresponds to the "downward direction" and the opposite direction corresponds to the "upward direction".

The solid-state battery 100 (including 100A to 100I) of the present invention includes, for example, the solid-state battery main body 10 and two end face electrodes 1 (including 1A and 1B) as shown in FIGS. 1 to 9. The solid-state battery main body 10 usually has a layered structure (particularly a laminated structure), and has, for example, a laminated direction L as shown in FIG. The solid-state battery main body 10 has one or more positive electrode layers and one or more negative electrode layers alternately laminated via a solid electrolyte layer, and has end face electrodes 1 (1A, 1B) on the end faces of the laminated structure. ing. The end face of the laminated structure is a surface parallel to the stacking direction (so-called side surface) including the end face of each layer to be laminated. The end face electrodes 1 (1A, 1B) are usually formed on two opposing end faces in a laminated structure. The number of layers of the positive electrode layer and the negative electrode layer is arbitrary and is not particularly limited. The solid-state battery of the present invention may have a parallel structure or a series structure. 1 to 9 are schematic cross-sectional views of the solid-state battery according to the first to ninth embodiments according to the present invention, respectively.

First, each basic layer and each member constituting the solid-state battery of the present invention will be described.

(Electrode layer)
The electrode layer includes a positive electrode layer and a negative electrode layer. The electrode layer contains an active material and may further contain an electron conductive material.

The positive electrode layer contains a so-called positive electrode active material, and may further contain an electron conductive material, a solid electrolyte material and / or a bonding material described later. The positive electrode layer is usually composed of a sintered body containing positive electrode active material particles and an electron conductive material, and contains positive electrode active material particles, electron conductive material particles, and optionally contained solid electrolyte particles and / or bondability. It may be composed of a sintered body containing the material.

The negative electrode layer contains a so-called negative electrode active material, and may further contain an electron conductive material, a solid electrolyte material and / or a bonding material described later. The negative electrode layer is usually composed of a sintered body containing negative electrode active material particles and an electron conductive material, and contains negative electrode active material particles, electron conductive material particles, and optionally contained solid electrolyte particles and / or bondability. It may be composed of a sintered body containing the material.

The positive electrode active material contained in the positive electrode layer and the negative electrode active material contained in the negative electrode layer are substances involved in the transfer of electrons in the solid battery, and the ions contained in the solid electrolyte material constituting the solid electrolyte layer are the positive electrode and the negative electrode. Charging and discharging are performed by moving (conducting) between the electrodes and transferring electrons. The positive electrode layer and the negative electrode layer are particularly preferably layers capable of occluding and releasing lithium ions or sodium ions. That is, the solid-state battery of the present invention is preferably a solid-state secondary battery in which lithium ions or sodium ions move between the positive electrode and the negative electrode via the solid electrolyte layer to charge and discharge the battery.

The positive electrode active material contained in the positive electrode layer is not particularly limited, and for example, a lithium-containing phosphoric acid compound having a pearcon-type structure, a lithium-containing phosphoric acid compound having an olivine-type structure, a lithium-containing layered oxide, and a spinel-type structure. At least one selected from the group consisting of lithium-containing oxides and the like having Examples of the lithium-containing phosphoric acid compound having a pear-con type structure include Li ₃ V ₂ (PO ₄ ) ₃ . Examples of the lithium-containing phosphate compound having an olivine _{structure, Li 3 Fe 2 (PO 4} ) 3, LiMnPO 4 , and the like. Examples of lithium-containing layered oxides include LiCoO ₂ , LiCo _1/3 Ni _1/3 Mn _1/3 O _{2, and the} like. Examples of the lithium-containing oxide having a spinel-type structure include LiMn ₂ O ₄ , LiNi _0.5 Mn _1.5 O _{4, and the} like.

Further, as the positive electrode active material capable of occluding and releasing sodium ions, a sodium-containing phosphoric acid compound having a pearcon-type structure, a sodium-containing phosphoric acid compound having an olivine-type structure, a sodium-containing layered oxide, and a sodium-containing material having a spinel-type structure are contained. At least one selected from the group consisting of oxides and the like can be mentioned.

The negative electrode active material contained in the negative electrode layer is not particularly limited, and for example, an oxide containing at least one element selected from the group consisting of Ti, Si, Sn, Cr, Fe, Nb, and Mo, graphite- At least one selected from the group consisting of lithium compounds, lithium alloys, lithium-containing phosphoric acid compounds having a pearcon-type structure, lithium-containing phosphoric acid compounds having an olivine-type structure, lithium-containing oxides having a spinel-type structure, and the like. Be done. An example of a lithium alloy is Li—Al or the like. Examples of the lithium-containing phosphoric acid compound having a pear-con type structure include Li ₃ V ₂ (PO ₄ ) ₃ . Examples of the lithium-containing phosphoric acid compound having an olivine-type structure include Li ₃ Fe ₂ (PO ₄ ) ₃ . Examples of lithium-containing oxides having a spinel-type structure include Li ₄ Ti ₅ O _{12 and the} like.

The negative electrode active material capable of occluding and releasing sodium ions is a group consisting of a sodium-containing phosphoric acid compound having a pearcon-type structure, a sodium-containing phosphoric acid compound having an olivine-type structure, a sodium-containing oxide having a spinel-type structure, and the like. At least one selected from is mentioned.

The electron conductive material contained in the positive electrode layer and the negative electrode layer is not particularly limited, and examples thereof include metal materials such as silver, palladium, gold, platinum, aluminum, copper, and nickel; and carbon materials. In particular, carbon is preferable because it does not easily react with the positive electrode active material, the negative electrode active material, and the solid electrolyte material, and is effective in reducing the internal resistance of the solid battery.

The solid electrolyte material that may be contained in the positive electrode layer and the negative electrode layer may be selected from, for example, the same materials as the solid electrolyte material that can be contained in the solid electrolyte layer described later.

The bonding material that may be contained in the positive electrode layer and the negative electrode layer may be selected from, for example, the same materials as the bonding material that can be contained in the bonding site described later.

The positive electrode layer and the negative electrode layer may each independently further contain a sintering aid. The sintering aid is not particularly limited, and is, for example, at least one selected from the group consisting of lithium oxide, sodium oxide, potassium oxide, boron oxide, silicon oxide, bismuth oxide, and phosphorus oxide. Can be.

The thicknesses of the electrode layers (positive electrode layer and negative electrode layer) are not particularly limited, and are, for example, 2 μm or more and 50 μm or less independently of each other, from the viewpoint of further and sufficiently suppressing poor connection between the electrode layer and the end face electrode. It is preferably 5 μm or more and 30 μm or less, and more preferably 5 μm or more and 20 μm or less.

The total number of layers of the positive electrode layer and the negative electrode layer is not particularly limited, and may be, for example, 2 or more and 200 or less, particularly 2 or more and 100 or less.

In the present invention, the electrode layer (that is, the positive electrode layer and / or the negative electrode layer) may have a current collector layer. The current collector layer may have the form of a foil, but it is preferable to have the form of a sintered body from the viewpoint of reducing the manufacturing cost of the solid-state battery by integral firing and reducing the internal resistance of the solid-state battery.

When the current collector layer has the form of a sintered body, it may be composed of, for example, a sintered body containing electron conductive material particles and a sintering aid. The electron conductive material contained in the current collector layer may be selected from, for example, the same materials as the electron conductive material that can be contained in the electrode layer. The sintering aid contained in the current collector layer may be selected from, for example, the same materials as the sintering aid that can be contained in the electrode layer.

The thickness of the current collector layer is not particularly limited, and may be, for example, 1 μm or more and 5 μm or less, particularly 1 μm or more and 3 μm or less.

(Solid electrolyte layer)
The solid electrolyte layer is composed of a sintered body containing solid electrolyte particles. The solid electrolyte layer is a layer capable of conducting ions (for example, lithium ions). The material of the solid electrolyte particles (that is, the solid electrolyte material) is not particularly limited as long as it can provide ions (for example, lithium ions or sodium ions) that can move (conduct) between the positive electrode layer and the negative electrode layer. Examples of the solid electrolyte material include a lithium-containing phosphoric acid compound having a pearcon structure, an oxide having a perovskite structure, an oxide having a garnet type or a garnet type similar structure, and the like. As the lithium-containing phosphoric acid compound having a NASICON _{structure, Li x M y (PO 4} ) 3 (1 ≦ x ≦ 2,1 ≦ y ≦ 2, M is, Ti, Ge, Al, from the group consisting of Ga and Zr At least one selected). Examples of the lithium-containing phosphoric acid compound having a pear-con structure include Li _1.2 Al _0.2 Ti _1.8 (PO ₄ ) ₃ . As an example of an oxide having a perovskite structure, La _0.55 Li _0.35 TiO _{3 and the} like can be mentioned. Examples of oxides having a garnet type or a garnet type similar structure include Li ₇ La ₃ Zr ₂ O _{12 and the} like.
Examples of the solid electrolyte in which sodium ions can be conducted include sodium-containing phosphoric acid compounds having a pearcon structure, oxides having a perovskite structure, oxides having a garnet type or a garnet type similar structure, and the like. The sodium-containing phosphate compound having a NASICON _{structure, Na x M y (PO 4} ) 3 (1 ≦ x ≦ 2,1 ≦ y ≦ 2, M is, Ti, Ge, Al, from the group consisting of Ga and Zr At least one selected).

The solid electrolyte layer may contain a sintering aid. The sintering aid contained in the solid electrolyte layer may be selected from, for example, the same materials as the sintering aid that can be contained in the electrode layer.

The thickness of the solid electrolyte layer is not particularly limited, and may be, for example, 1 μm or more and 15 μm or less, particularly 1 μm or more and 5 μm or less.

(End face electrode)
The end face electrode 1 is an electrode formed on the end face of the laminated structure, and is usually two end face electrodes (1A, 1B) on the positive electrode side and the negative electrode side formed on the two opposite end faces in the laminated structure. .. The end face electrodes 1A and 1B may be formed on the entire surface or a part of the end face of the laminated structure, respectively. The end face electrodes 1A and 1B are preferably formed on the entire surface of the end face of the laminated structure from the viewpoint of further and sufficiently suppressing poor connection between the electrode layer and the end face electrode. The end face of the laminated structure is a surface parallel to the stacking direction (so-called side surface) including the end face of each layer to be laminated.

The end face electrode 1 is usually composed of a sintered body containing electron conductive material particles and a sintering aid. The electron conductive material contained in the end face electrode 1 may be selected from, for example, the same materials as the electron conductive material that can be contained in the electrode layer. The sintering aid contained in the end face electrode 1 may be selected from, for example, the same materials as the sintering aid that can be contained in the electrode layer.

The thickness of the end face electrode is not particularly limited, and may be, for example, 1 μm or more and 50 μm or less, particularly 5 μm or more and 30 μm or less.

(Protective layer)
A protective layer is usually arranged on the outermost surface of the electrode layer. The outermost surface of the electrode layer is the uppermost surface of the electrode layer arranged at the top and the lowermost surface of the electrode layer arranged at the bottom.

The protective layer is not particularly limited as long as it has electrical insulation and protects the solid-state battery from external impact, and may be made of, for example, a solid electrolyte material.

The protective layer is preferably composed of a sintered body containing a solid electrolyte material, and may further contain a sintering aid.

The solid electrolyte material that may be contained in the protective layer may be selected from, for example, the same materials as the solid electrolyte material that can be contained in the solid electrolyte layer. The sintering aid that may be contained in the protective layer may be selected from, for example, the same materials as the sintering aid that may be contained in the electrode layer.

The thickness of the protective layer is not particularly limited, and may be, for example, 1 μm or more and 100 μm or less, particularly 10 μm or more and 100 μm or less.

The positive electrode layer, negative electrode layer, solid electrolyte layer and end face electrode (and optionally protective layer) are sintered from each other from the viewpoint of further and sufficiently relieving stress due to expansion and contraction (particularly expansion) of the solid-state battery volume. It is preferable that they are integrally sintered with each other. The term "integral sintering of sintered bodies" means that two or more members adjacent to each other or in contact with each other are joined by sintering. Here, it is preferable that the positive electrode layer, the negative electrode layer, the solid electrolyte layer, and the end face electrode (and, if desired, the protective layer) are all sintered, but integrally sintered. This is because, in the present invention, even in the sintered body, the stress due to expansion and contraction (particularly expansion) can be further and sufficiently relaxed.

(More important characteristic structure of the solid-state battery of the present invention)
The solid-state battery 100 (including 100A to 100I) of the present invention includes, for example, the solid-state battery main body 10 and two end face electrodes 1 (1A and 1B) as shown in FIGS. 1 to 9, and the two are included. It has metal terminals 2 (2A, 2B) that are electrically connected to each of the end face electrodes 1 (1A and 1B).

The metal terminals 2A and 2B electrically connect the end face electrodes 1A and 1B of the solid state battery to the substrate 3 such as an external circuit and element, and form the solid state battery (particularly the solid state battery body provided with the end face electrodes) on the substrate 3. It is for supporting the part). The metal terminals 2A and 2B may be made of any metal material having electron conductivity. Examples of such metal materials include silver, palladium, gold, platinum, aluminum, copper, nickel and the like. Further, alloys containing these as main components may be appropriately used. It is preferable to use copper or a copper alloy (tough pitch copper, brass, Corson alloy).

In the present invention, each of the metal terminals 2A and 2B has Za and Zb on the opposite sides of the end face electrodes 1A and 1B from the solid-state battery main body 10 in a cross-sectional view (and a plan view), as shown in FIGS. It supports the solid-state battery 100 (100A to 100I) (particularly the solid-state battery main body portion provided with the end face electrode) while protruding from the surface. In other words, each of the metal terminals 2A and 2B (particularly, the terminal body portions 20A and 20B described later) has end face electrodes (hereinafter, simply referred to as "connection end face electrodes") 1A and 1B to which the metal terminals are electrically connected. As a reference, the solid-state battery 100 (particularly the solid-state battery main body having end face electrodes) is supported on the substrate 3 while extending or projecting to Za, Zb on the opposite side of the solid-state battery main body 10. FIG. 10 is a schematic plan view of the solid-state battery according to the first embodiment of the present invention. FIG. 11 is a schematic plan view of a modified example of the solid-state battery according to the first embodiment of the present invention.

In cross-sectional view (and plan view), each of the metal terminals 2A and 2B projects to Za and Zb on the opposite side of the solid-state battery body 10 from the metal terminals 2A (or 2B) (particularly the terminal body described later). 20A (or 20B)) is located on the opposite side Za (or Zb) of the connection end face electrode 1A (or 1B) to the solid-state battery 10, but at least in part, beyond the thickness of the metal terminal itself. It means that it extends or protrudes in the side Za (or Zb) direction.

The fact that each of the metal terminals 2A and 2B supports the solid-state battery 100 (particularly the solid-state battery main body having the end face electrode) means that each of the metal terminals 2A and 2B supports the solid-state battery 100 (particularly the end face electrode) on the substrate 3. It means that it holds the solid-state battery main body). When each of the metal terminals 2A and 2B supports the solid-state battery 100 (particularly the solid-state battery body having the end face electrodes) on the substrate 3, the solid-state battery 100 (particularly the solid-state battery body having the end face electrodes) is supported. ) And the substrate 3 are achieved, the solid-state battery 100 (particularly, the solid-state battery main body portion provided with the end face electrodes) may be movable by an external force. The metal terminal may support the solid-state battery main body portion via the end face electrode.

By supporting the solid-state battery (particularly the solid-state battery main body having the end face electrode) while each of the metal terminals 2A and 2B projects to the opposite side of the solid-state battery main body 10, the solid-state battery 10 (particularly the electrode layer) The stress generated by the expansion and contraction (particularly expansion) of the volume is relaxed or reduced in the overhanging portion of the metal terminal (particularly the terminal body portions 20A and 20B described later) before being transmitted to the connection portion between the metal terminal and the substrate. To. The stress is relaxed or reduced in this way because the transmission path until the stress is transmitted to the connection portion J between the metal terminal 2 (2A, 2B) and the substrate 3 becomes long, and the metal terminal It is considered that the stress is absorbed by the deformation of the overhanging portion (particularly, the terminal body portions 20A and 20B described later). As a result, the concentration of the stress on the support point G with the substrate 3 at the metal terminals 2A and 2B is suppressed or relaxed, and the destruction of the connection portion between the metal terminal and the substrate can be sufficiently suppressed. Further, it is possible to suppress the destruction and short circuit of the solid-state battery due to the contact between the adjacent solid-state batteries due to the expansion of the solid-state battery.

For example, each of the metal terminals 2A and 2B (particularly the terminal body portions 20A and 20B described later) is one from the end on the connection end face electrode (1A, 1B) side to the end on the substrate (3) side. More than (for example, 1 to 5) bent portions r, 1 or more (for example, 1 to 5) curved portions s, 1 or more (for example, 1 to 5) inclined portions t, or a combination thereof. Supports the solid-state battery 100 (particularly, the solid-state battery main body portion provided with the end face electrodes) on the substrate 3. The inclined portion t is a portion that is inclined with respect to the bottom surface E of the solid-state battery 100 in a cross-sectional view. In the cross-sectional view, the inclined portion t is based on a parallel line with respect to the bottom surface E passing through the starting point, starting from the end on the electrode side of the connecting end face of the metal terminals 2A and 2B (particularly, the terminal body portions 20A and 20B described later). When, it may be inclined upwards or downwards. Each of the metal terminals 2A and 2B (particularly the terminal body portions 20A and 20B) has one or more (for example, 1) from the end on the connection end face electrode (1A, 1B) side to the end on the substrate (3) side. It may further have one to five) parallel portions p and / or one or more (eg, one to five) vertical portions q. The parallel portion p is a portion parallel to the bottom surface E of the solid-state battery 100 in a cross-sectional view. The vertical portion q is a portion perpendicular to the bottom surface E of the solid-state battery 10 in a cross-sectional view.

A specific example will be illustrated.
For example, in FIGS. 1 and 2, each of the metal terminals 2A and 2B (particularly the terminal body portions 20A and 20B) is from the end on the connection end face electrode (1A, 1B) side to the end on the substrate (3) side. By this time, the solid-state battery 10 (particularly the solid-state battery main body having end face electrodes) is supported on the substrate 3 while having one parallel portion p, one bent portion r, and one vertical portion q in this order. are doing.

Further, for example, in FIGS. 3 to 5, each of the metal terminals 2A and 2B (particularly the terminal body portions 20A and 20B) is from the end on the connection end face electrode (1A, 1B) side to the end on the substrate (3) side. The solid-state battery 10 (particularly, the solid-state battery main body portion provided with the end face electrodes) is supported on the substrate 3 while having one inclined portion s as a whole.

Further, for example, in FIG. 6, each of the metal terminals 2A and 2B (particularly the terminal body portions 20A and 20B) extends from the end portion on the connection end face electrode (1A, 1B) side to the end portion on the substrate (3) side. In this order, one parallel portion p, one bent portion r, one inclined portion t, one bent portion r, one inclined portion t, one bent portion r, one inclined portion t, and one bending. The solid-state battery 10 (particularly the solid-state battery main body portion provided with the end face electrodes) is supported on the substrate 3 while having a portion r and one inclined portion t.

Further, for example, in FIG. 7, each of the metal terminals 2A and 2B (particularly the terminal body portions 20A and 20B) extends from the end portion on the connection end face electrode (1A, 1B) side to the end portion on the substrate (3) side. In this order, it has one inclined portion t, one bent portion r, one inclined portion t, one bent portion r, one inclined portion t, one bent portion r, and one vertical portion q. However, the solid-state battery 10 (particularly the solid-state battery main body provided with the end face electrodes) is supported on the substrate 3.

Further, for example, in FIG. 8, each of the metal terminals 2A and 2B (particularly the terminal body portions 20A and 20B) extends from the end portion on the connection end face electrode (1A, 1B) side to the end portion on the substrate (3) side. In this order, the solid-state battery 10 (particularly the solid-state battery main body having end face electrodes) is mounted on the substrate 3 while having two continuous curved portions s, one bent portion r, and one vertical portion q. I support it.

Further, for example, in FIG. 9, each of the metal terminals 2A and 2B (particularly the terminal body portions 20A and 20B) extends from the end portion on the connection end face electrode (1A, 1B) side to the end portion on the substrate (3) side. In this order, the solid-state battery 10 (particularly the solid-state battery main body having the end face electrode) is supported on the substrate 3 while having one inclined portion t, one bent portion r, and one inclined portion t. ing.

Each of the metal terminals 2A and 2B includes at least the terminal body portions 20A and 20B as shown in FIGS. 1 to 9. In the present invention, each of the metal terminals 2A and 2B preferably further includes end face electrode side mounting portions 21A and 21B and / or substrate side mounting portions 22A and 22B in addition to the terminal body portions 20A and 20B. For example, when each of the metal terminals 2A and 2B further includes the end face electrode side mounting portions 21A and 21B, the metal terminal can be more firmly connected to the end face electrode. Further, for example, when each of the metal terminals 2A and 2B further includes a substrate-side mounting portion, the metal terminal can be more firmly connected to the substrate, and as a result, a stronger connection of the solid-state battery to the substrate can be achieved. Can be achieved.

Each of the terminal body portions 20A and 20B of the metal terminals 2A and 2B is electrically connected in contact with the connection end face electrodes 1A and 1B (preferably end face electrode side mounting portions 21A and 21B) at one end, and at the other end. It is a member that comes into contact with the substrate 3 and is electrically connected. Each of the terminal body portions 20A and 20B has both a support function of a solid-state battery (particularly a solid-state battery body portion having an end face electrode) on a substrate by the metal terminal and an electrical conduction function between the substrate and the solid-state battery. It is a member that mainly plays the function of.

Each of the end face electrode side mounting portions 21A and 21B of the metal terminals 2A and 2B is electrically connected to one end of the terminal body portions 20A and 20B in cross-sectional view, and is electrically connected to the end face electrodes 1A and 1B. It is a member for. The end face electrode side mounting portions 21A and 21B extend along the connecting end face electrodes 1A and 1B in cross-sectional view at least in a part thereof (preferably the whole), and the end face electrode side mounting portions 21A and 21B and the end face electrode side mounting portions 21A and 21B. Achieves face-to-face connection with the end face electrodes 1A and 1B. As a result, not only a stronger connection but also a better electrical continuity connection is achieved between the metal terminals 2A, 2B and the end face electrodes 1A, 1B. For example, the end face electrode side mounting portions 21A and 21B are connected to the end face electrodes 1A and 1B by surface contact. The connection of the end face electrode side mounting portion to the end face electrode may be achieved by a reflow method or a flow method as described later.

Each of the board- side mounting portions 22A and 22B of the metal terminals 2A and 2B is electrically connected to the other ends of the terminal body portions 20A and 20B in a cross-sectional view, and is a member for electrical connection with the substrate 3. Is. The board- side mounting portions 22A and 22B extend along the substrate in a cross-sectional view at least in a part thereof (preferably the whole), and achieve a connection between the surfaces of the substrate-side mounting portion and the substrate. .. As a result, not only a stronger connection but also a connection with better electrical conduction is achieved between the metal terminals 2A, 2B and the substrate. For example, the board- side mounting portions 22A and 22B are connected to the board 3 by surface contact. The connection of the board-side mounting portion to the board may be achieved by the reflow method or the flow method as described later.

Each of the board- side mounting portions 22A and 22B extends in the direction of the solid-state battery main body portion 10 side as shown in FIGS. 1 to 4 and 6 to 9 in a cross-sectional view. As shown, it may extend in the direction opposite to that of the solid-state battery main body 10. From the viewpoint of further and sufficiently suppressing the destruction of the connection portion J between the metal terminal and the substrate, each of the substrate side mounting portions 22A and 22B extends in the direction of the solid-state battery main body portion 10 side in a cross-sectional view. It is preferable to have.

One end of the terminal body portions 20A and 20B connected to the end face electrode side mounting portions 21A and 21B may be connected at any height of the end face electrode side mounting portions 21A and 21B. From the viewpoint of further and sufficiently relaxing the stress due to the expansion and contraction (particularly expansion) of the solid-state battery volume, one end of the terminal body portions 20A and 20B connected to the end face electrode side mounting portions 21A and 21B is shown in cross-sectional view. As shown in FIGS. 1 to 9, the height y of the solid-state battery is 0.3 × y or more, particularly 0.5, at the end face electrode side mounting portions 21A and 21B, with reference to the bottom surface E of the solid-state battery 100. It is preferable that they are connected at a height of × y or more. From the same viewpoint, more preferably, one end of the terminal body portions 20A and 20B connected to the end face electrode side mounting portions 21A and 21B has a bottom surface E of the solid-state battery 100 as shown in FIGS. 1 to 9 in a cross-sectional view. As a reference, it is preferable that the height y of the solid-state battery is connected at the height y of the end face electrode side mounting portions 21A and 21B (that is, the upper ends of the end face electrode side mounting portions 21A and 21B). The height y of the solid-state battery is usually 0.5 mm or more and 10 mm or less, particularly 1 mm or more and 5 mm or less.

The support points G on the substrate side in each of the terminal body portions 20A and 20B of the metal terminals 2A and 2B may be arranged at any position on the substrate 3 in a cross-sectional view. For example, the support points G on the substrate side of the terminal bodies 20A and 20B of the metal terminals 2A and 2B are the solid-state battery body 10 with respect to the connection end face electrodes 1A and 1B as shown in FIGS. 1 to 8 in a cross-sectional view. It may be arranged on the side opposite to that of the solid-state battery, or may be arranged on the solid-state battery main body 10 side as shown in FIG. From the viewpoint of further and sufficiently relaxing the stress due to the expansion and contraction (particularly expansion) of the solid-state battery volume, the support points G on the substrate side of the terminal body portions 20A and 20B of the metal terminals 2A and 2B are connected in a cross-sectional view. It is preferable that the end face electrodes 1A and 1B are arranged on the side opposite to the solid-state battery main body 10. The support point G on the substrate side of the terminal body portions 20A and 20B of the metal terminals 2A and 2B is the terminal body when the solid-state battery (particularly the solid-state battery body portion having the end face electrode) is supported on the substrate by the metal terminal. This is the point where the portion comes into contact with the substrate, and corresponds to the other ends of the terminal body portions 20A and 20B described above.

The distance a between the support point G on the substrate side and the connection end face electrodes 1A and 1B at each of the terminal body portions 20A and 20B of the metal terminals 2A and 2B is not particularly limited, but the expansion and contraction (particularly expansion) of the solid-state battery volume ) Is more preferably 0.5% or more and more preferably 2.0% or more with respect to the solid-state battery width dimension b from the viewpoint of further and sufficiently relaxing the stress. The upper limit of the distance a is not particularly limited, and from the viewpoint of improving the energy density (for example, effective use of space), the distance a is preferably 10% or less, and more preferably 5% or less. The distance a is a distance in the linear direction in which the bottom surface E of the solid-state battery is defined in a cross-sectional view. The width dimension b of the solid-state battery is usually 0.1 mm or more and 50 mm or less. The depth dimension of the solid-state battery (dimensions in the front and back directions of the paper surface in FIGS. 1 to 9) is usually 0.1 mm or more and 50 mm or less.

The connection portion between the terminal body portion 20A (or 20B) and the end face electrode side mounting portion 21A (or 21B) preferably has a folded shape in cross-sectional view. Here, the folded shape is a shape and a form formed by folding back one member having dimensions corresponding to the terminal body portion 20A (or 20B) and the end face electrode side mounting portion 21A (or 21B). .. Since the connection portion has a folded shape, the terminal body portion and the end face electrode side mounting portion are formed by simply folding one member without using a connection method such as a reflow method or a flow method. The connections between them are even stronger and the electrical conduction between them is even better. In a cross-sectional view, for example, as shown in FIGS. 2 to 4 and 9, one end of the terminal body portion 20A (or 20B) and the end portion (that is, the upper end) of the end face electrode side mounting portion 21A (or 21B) are connected. When this is done, the connection portion between the terminal body portion 20A (or 20B) and the end face electrode side mounting portion 21A (or 21B) can have a folded shape. In this case, one end (end) of the terminal body 20A (or 20B) is the end face electrode side mounting portion 21A (or 21B) with respect to the height y of the solid-state battery with reference to the bottom surface E of the solid-state battery in cross-sectional view. It is connected at the height of y in.

As shown in FIGS. 1 to 9, the connection portion between the terminal body portion 20A (or 20B) and the substrate side mounting portion 22A (or 22B) preferably has a folded shape in cross-sectional view. Here, the folded shape is a shape and a form formed by folding back one member having dimensions corresponding to the terminal main body portion 20A (or 20B) and the substrate side mounting portion 22A (or 22B). Since the connection portion has a folded shape, the terminal body portion and the substrate side mounting portion are formed by simply folding back one member without using a connection method such as a reflow method or a flow method. The connections between them are even stronger and the electrical continuity between them is even better. When the other end of the terminal body 20A (or 20B) and the end of the board side mounting 22A (or 22B) are connected in a cross-sectional view, the terminal body 20A (or 20B) and the board side mounting 22A ( Alternatively, the connection portion with 22B) can have a folded shape.

In a more preferred embodiment, as shown in FIGS. 2 to 4 and 9, a connection portion between the terminal body portion 20A (or 20B) and the end face electrode side mounting portion 21A (or 21B), and a terminal body portion 20A ( The connection portion between the 20B) and the substrate side mounting portion 22A (or 22B) has a folded shape in a cross-sectional view. Here, the folded shape is obtained by folding back one member having dimensions corresponding to the terminal body portion 20A (or 20B), the end face electrode side mounting portion 21A (or 21B), and the substrate side mounting portion 22A (or 22B). It is the shape and form formed. Since these connecting portions have a folded shape, the terminal body portion, the end face electrode side mounting portion, and the substrate side mounting portion simply fold back one member without using a connection method such as a reflow method or a flow method. The connections between them are even stronger and the electrical conduction between them is even better. In cross-sectional view, one end (end) of the terminal body 20A (or 20B) and the end of the end face electrode side mounting portion 21A (or 21B) are connected to each other and the other end of the terminal body 20A (or 20B). When the end of the board side mounting portion 22A (or 22B) is connected, the terminal body portion 20A (or 20B), the end face electrode side mounting portion 21A (or 21B), and the board side mounting portion 22A (or 22B) It is possible that the connecting portion of the above has a folded shape.

When the solid-state battery 100 (particularly the solid-state battery main body provided with the end face electrodes) is supported by the metal terminals 2A and 2B on the substrate 3, the distance x between the substrate 3 and the solid-state battery 100 becomes 0 in a cross-sectional view. The total length (height) may be large, or the total length (height) may be such that the distance x is 1.0% or more of the height y of the solid-state battery 100. When the solid-state battery 100 (particularly the solid-state battery main body having the end face electrode) is supported on the substrate 3, the metal terminals 2A and 2B show the substrate 3 and the solid-state battery 100 (particularly the solid-state battery having the end face electrode) in a cross-sectional view. It is preferable to have a total length (height) such that the distance x from the main body) is 1.0% or more, preferably 5.0% or more of the height y of the solid-state battery 100. By securing such a distance x, even if the volume of the solid-state battery 100 expands in the stacking direction L, the destruction of the solid-state battery 100 and the substrate 3 due to the abdomen (that is, contact) can be suppressed to ten parts. it can. The upper limit of the distance x is not particularly limited, and from the viewpoint of improving the energy density (for example, effective use of space), the distance x is preferably 20.0% or less of the height y, and 10.0% or less. Is more preferable.

Each of the metal terminals 2A and 2B may be a plate-shaped material or a rod-shaped material. From the viewpoint of further and sufficiently relaxing the stress due to the expansion and contraction (particularly expansion) of the solid-state battery volume, it is preferable that each of the metal terminals 2A and 2B is a plate-like material.

The fact that each of the metal terminals 2A and 2B is a plate-like object means that, for example, as shown in FIG. 10, each of the metal terminals 2A and 2B has substantially the same cross-sectional view shape in the depth direction of the cross-sectional view. Is. FIG. 10 is a schematic plan view of the solid-state battery according to the first embodiment of the present invention.

The fact that each of the metal terminals 2A and 2B is a rod-shaped object means that each of the metal terminals 2A and 2B has a rod shape, for example, as shown in FIG. FIG. 11 is a schematic plan view of a modified example of the solid-state battery according to the first embodiment of the present invention, and is a schematic plan view when the metal terminals 2A and 2B in the solid-state battery according to the first embodiment have a rod shape. It is a figure.

The thickness of the metal terminals 2A and 2B is such that the metal terminals sufficiently support the solid-state battery (particularly the solid-state battery main body provided with the end face electrodes) and sufficiently relax the stress due to the expansion and contraction (particularly expansion) of the solid-state battery volume. As long as it does, it is not particularly limited. The thickness of the metal terminals 2A and 2B is such that the support of the solid-state battery (particularly the solid-state battery main body provided with the end face electrode) and the relaxation of stress due to the expansion and contraction (particularly expansion) of the volume of the solid-state battery (particularly the solid-state battery main body). From the viewpoint, it is preferably 50 μm or more and 500 μm or less, and preferably 100 μm or more and 300 μm or less. When the metal terminal has a rod shape, the diameter (or maximum dimension) of the rod shape in cross-sectional view may be within the range of the above thickness.

[Manufacturing method of solid-state battery]
The solid-state battery 100 of the present invention connects (or fixes) the metal terminals 2 (2A, 2B) to the end face electrodes 1 (1A, 1B) of the solid-state battery main body 10 having the end face electrodes 1 (1A, 1B). , Can be manufactured. The solid-state battery of the present invention is, for example, the solid-state battery 100 as shown in FIG.

The metal terminal 2 can be obtained by cutting out a plate material or a bar material. When the metal terminal 2 includes a terminal body portion, an end face electrode side mounting portion, and a substrate side mounting portion, the metal terminals may be obtained by connecting (or fixing) these portions to each other by welding, or as described above. A metal terminal may be obtained by folding back a member having dimensions corresponding to each portion. The metal terminals may be obtained by combining welding or folding methods.

The reflow method for obtaining the metal terminal 2 is a reflow soldering method, in which the solder previously applied to the parts at room temperature is later heated and melted to achieve solder connection. The method.

The flow method for obtaining the metal terminal 2 is a method in which solder melted by heat is jetted and applied to a component to achieve a connection by solder.

The method of connecting (or fixing) the metal terminal 2 to the solid-state battery body 10 is not particularly limited as long as electrical connection and mutual fixing between the metal terminal 2 and the solid-state battery body 10 can be achieved, for example. A method similar to the reflow method and the flow method for obtaining the metal terminals described above can be adopted.

For example, when the reflow method is adopted to achieve the connection and fixing of the metal terminal 2 to the solid-state battery body 10, specifically, first, a paste-like or cream-like metal paste, for example, a copper paste is applied to the metal terminal 2 or It is applied to at least one of the solid-state battery main body 10. Next, after the paste is dried, the metal terminal 2 and the solid-state battery main body 10 are heated at a temperature at which the sintering of the metal paste proceeds with a metal paste, for example, a copper paste interposed between them. This sinters the metal paste to achieve connection and fixation. As the metal paste, it is preferable to use a paste having the same composition as that of the external terminal.

(Manufacturing method of solid-state battery main body 10 having end face electrodes 1 (1A, 1B))
The solid-state battery main body 10 having the end face electrodes 1 (1A, 1B) can be manufactured by a printing method such as a screen printing method, a green sheet method using a green sheet, or a composite method thereof. Hereinafter, the case where the printing method is adopted will be described in detail, but it is clear that the method is not limited to this method.

The method for manufacturing the solid-state battery main body 10 having the end face electrodes 1 (1A, 1B) is as follows.
The step of forming the unfired laminate by a printing method; and the step of firing the unfired laminate are included.

-Step of forming an unfired laminate In this step, several types of pastes such as a positive electrode layer paste, a negative electrode layer paste, a solid electrolyte layer paste, and an end face electrode paste are used as ink to form a predetermined structure on a substrate. The unfired laminate of No. 1 is formed by a printing method. A protective layer paste may be further used. A laminate in which layers and members other than the end face electrodes are laminated may be formed by a printing method, and an end face electrode may be formed on the end face of the obtained laminate (that is, a laminated structure) by a coating method such as a dip method. .. The end face electrode may be partially or wholly formed by a vapor phase method such as a sputtering method and / or a vapor deposition method.

Each paste contains a predetermined constituent material of each layer (member) selected from the group consisting of the above-mentioned positive electrode active material, negative electrode active material, electron conductive material, solid electrolyte material, bonding material, and sintering aid. It can be produced by wet-mixing an organic vehicle in which an organic material is dissolved in a solvent.

The organic material contained in the paste is not particularly limited, but polymer compounds such as polyvinyl acetal resin, cellulose resin, polyacrylic resin, polyurethane resin, polyvinyl acetate resin, and polyvinyl alcohol resin can be used.
The solvent is not particularly limited as long as the organic material can be dissolved, and for example, toluene, ethanol and the like can be used.

Media can be used in wet mixing, and specifically, a ball mill method, a viscomill method, or the like can be used. On the other hand, a wet mixing method that does not use media may be used, and a sand mill method, a high-pressure homogenizer method, a kneader dispersion method, or the like can be used.

The base material is not particularly limited as long as it can support the unfired laminate, and for example, a polymer material such as polyethylene terephthalate can be used. When the unfired laminate is used in the firing step while being held on the substrate, the substrate used is one having heat resistance to the firing temperature.

At the time of printing, printing layers are sequentially laminated with a predetermined thickness and pattern shape, and an unfired laminate corresponding to a predetermined solid-state battery structure is formed on the base material. Specifically, when manufacturing the solid-state battery main body 10 having a predetermined laminated structure, for example, the solid-state battery main body 10 is divided into a predetermined thickness from the lowest to the highest, and a plurality of print layers are sequentially laminated in a predetermined pattern shape. .. When forming each print layer, a drying treatment (that is, a solvent evaporation treatment) is performed.

After forming the unfired laminate, the unfired laminate may be peeled off from the base material and subjected to a firing step, or the unfired laminate may be subjected to a firing step while being held on the substrate. Good.

-Baking process The unfired laminate is subjected to firing. Firing is carried out by removing the organic material in a nitrogen gas atmosphere containing oxygen gas, for example, at 500 ° C., and then heating in a nitrogen gas atmosphere, for example, at 550 ° C. to 1000 ° C. Firing may usually be performed while pressurizing the unfired laminate in the stacking direction L (in some cases, the stacking direction L and the direction M perpendicular to the stacking direction L). The pressing force is not particularly limited, and may be, for example, 1 kg / cm ² or more and 1000 kg / cm ² or less, particularly 5 kg / cm ² or more and 500 kg / cm ² or less.

[Aspect of solid-state battery]
The solid-state battery of the present invention can be distributed in various modes.

For example, the solid-state battery of the present invention may be distributed as a solid-state battery mounted on the substrate 3 (for example, solid-state batteries 100A to 100I as shown in FIGS. 1 to 9), or the end face before mounting. It may be distributed as a solid-state battery (for example, a solid-state battery 100 as shown in FIG. 12) in which a metal terminal 2 (2A, 2B) is connected (or fixed) to an electrode 1 (1A, 1B). FIG. 12 is a schematic cross-sectional view showing an example when the solid-state battery of the present invention (for example, the solid-state battery according to the first embodiment of the present invention) is distributed.

Further, for example, the solid-state battery of the present invention is a solid-state battery set (for example,) of a solid-state battery to which the metal terminals 2 (2A, 2B) are not yet connected (or fixed) and the metal terminals 2 (2A, 2B) before mounting. , A set of the metal terminals 2 (2A, 2B) as shown in FIG. 13 and the solid-state battery main body 10 having the end face electrodes 1 (1A, 1B)) may be distributed. FIG. 13 is a schematic cross-sectional view showing an example when the metal terminal of the present invention (for example, the metal terminal of the solid-state battery according to the first embodiment of the present invention) is distributed.

The solid-state battery according to the embodiment of the present invention can be used in various fields where storage is expected. Although only an example, the solid-state battery according to the embodiment of the present invention is used in the fields of electricity, information, and communication (for example, mobile phones, smartphones, smart watches, laptop computers, digital cameras, activities, etc. Electric / electronic equipment field or mobile equipment field including small electronic devices such as meter, arm computer, electronic paper, RFID tag, card type electronic money), home / small industrial application (for example, electric tool, golf cart, home) For use / nursing / industrial robots), large industrial applications (eg forklifts, elevators, bay port cranes), transportation systems (eg hybrid cars, electric cars, buses, trains, electrically power assisted bicycles, electric (Fields such as motorcycles), power system applications (for example, various power generation, road conditioners, smart grids, general household installation type power storage systems, etc.), medical applications (medical equipment fields such as earphone hearing aids), pharmaceutical applications (dose management) It can be used in fields such as systems), IoT fields, and space / deep sea applications (for example, fields such as space probes and submersible research vessels).

1: 1A: 1B: End face electrode 2: 2A: 2B: Metal terminal 3: Substrate 10: Solid-state battery body 20: 20A: 20B: Terminal body 21: 21A: 21B: End face electrode side mounting 22: 22A: 22B : Board side mounting part 100: Solid-state battery

Claims (14)

1. A solid-state battery including a solid-state battery body and two end face electrodes.
   The solid-state battery has metal terminals that are electrically connected to each of the two end face electrodes.
   A solid-state battery in which the metal terminal supports the solid-state battery main body provided with the end face electrode while projecting to the side opposite to the solid-state battery main body in a cross-sectional view.
2. The metal terminal is
   A terminal body that supports the solid-state battery body with the end face electrodes;
   Claims include an end face electrode-side mounting portion that is electrically connected to one end of the terminal body in cross-section; and a substrate-side mounting that is electrically connected to the other end of the terminal body in cross-section. Item 1. The solid-state battery according to item 1.
3. The terminal body portion of the metal terminal has one or more bent portions r, one or more curved portions s, one or more inclined portions t, or a combination thereof in a cross-sectional view. Solid-state battery.
4. The support point G on the substrate side of the terminal body of the metal terminal is arranged on the side opposite to the solid-state battery body of the end face electrode to which the metal terminal is electrically connected in a cross-sectional view. The solid-state battery according to claim 2 or 3.
5. The distance a between the support point G on the substrate side of the metal terminal and the end face electrode to which the metal terminal is electrically connected is 0.5% with respect to the solid-state battery width dimension b. The solid-state battery according to claim 4, which is the above.
6. In a cross-sectional view, the one end of the terminal body portion has a height y of the solid-state battery at a height of 0.3 × y or more at the end face electrode side mounting portion with reference to the bottom surface of the solid-state battery. The solid-state battery according to any one of claims 2 to 5, which is connected.
7. The solid-state battery according to any one of claims 2 to 6, wherein the connection portion between the terminal body portion and the end face electrode side mounting portion has a folded shape in a cross-sectional view.
8. The solid-state battery according to any one of claims 2 to 7, wherein the connection portion between the terminal body portion and the substrate side mounting portion has a folded shape in a cross-sectional view.
9. When the solid-state battery main body provided with the end face electrodes of the metal terminal is supported on the substrate, the distance x between the substrate and the solid-state battery main body is the height y of the solid-state battery in a cross-sectional view. The solid-state battery according to any one of claims 1 to 8, wherein the solid-state battery main body provided with the end face electrodes is supported so as to have a content of 1.0% or more.
10. The solid-state battery according to any one of claims 1 to 9, wherein the metal terminal is a plate-like material.
11. The solid-state battery according to any one of claims 1 to 10, wherein the metal terminal has a thickness of 50 μm or more and 500 μm or less in a cross-sectional view.
12. The solid-state battery according to any one of claims 1 to 11, wherein the solid-state battery includes a positive electrode layer, a negative electrode layer, and a solid electrolyte layer interposed between the positive electrode layer and the negative electrode layer.
13. The solid-state battery according to claim 12, wherein the positive electrode layer and the negative electrode layer are layers capable of storing and releasing lithium ions.
14. The solid-state battery according to claim 12 or 13, wherein the positive electrode layer, the negative electrode layer, the solid electrolyte layer, and the end face electrode are integrally sintered with each other.

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