JP6497948B2 - All solid-state lithium ion secondary battery - Google Patents

Description

  The present invention relates to an all solid-state lithium ion secondary battery.

  The all solid-state lithium ion secondary battery has a power generation element configured by laminating a positive electrode layer, a solid electrolyte layer, and a negative electrode layer in this order. An all solid-state lithium ion secondary battery has a structure in which a power generation element is enclosed in an outer package made of a laminate film.

In Patent Document 1, a power generation element is sandwiched between a pair of front and back laminate films, and the peripheral portions of the pair of laminate films are sealed to form a seal portion. Describes a lithium-ion secondary battery having a structure enclosed in FIG.
The lithium ion secondary battery of Patent Document 1 includes an external terminal (positive electrode current collector plate) electrically connected to the positive electrode layer of the power generation element and an external terminal electrically connected to the negative electrode layer of the power generation element. And a terminal (negative electrode current collector plate).
Each of these external terminals is disposed from the inside of the lithium ion secondary battery to the outside through the gap between the pair of laminate films in the seal portion, and protrudes outward.
For this reason, in the seal part of a pair of laminate films, the thickness of the region where the external terminals are provided is a thickness obtained by adding the thickness of the external terminals to the thickness of the two laminate films.

JP 2014-203651 A

  Many types of communication terminal devices having an all-solid-state lithium ion secondary battery have been developed. Such a communication terminal device is required to be thin and lightweight. For this reason, all solid-state lithium ion secondary batteries used in these communication terminal devices are naturally required to be thin and lightweight.

  In addition, it is conceivable that an extremely thin communication terminal device such as a smart key or an IC card incorporates an all-solid-state lithium ion secondary battery as a power source. The all-solid-state type used in these communication terminal devices Lithium ion secondary batteries are required to be thinner and lighter.

By the way, according to the knowledge of the present inventor, in the case of a structure in which an external terminal protrudes through a gap between a pair of laminate films in a seal portion as in the lithium ion secondary battery described in Patent Document 1, an external The terminal thickness is at least about 0.3 mm.
For this reason, even if the thickness of the battery is reduced, the thickness of the external terminal is restricted, and it is difficult to reduce the thickness of the entire battery (total thickness of the battery) to a certain extent.

  The present invention has been made in view of the above problems, and provides an all solid-state lithium ion secondary battery having a structure that can be easily formed thin.

The present invention
A battery body including one or more power generating elements configured by laminating a positive electrode layer, a solid electrolyte layer having lithium ion conductivity, and a negative electrode layer in this order;
It is composed of a laminate film having a metal layer as an intermediate layer, and an exterior body in which the battery body is enclosed,
A positive electrode external terminal electrically connected to a positive electrode terminal formed of an outer surface of the positive electrode layer on one end side of the battery body;
A negative electrode external terminal electrically connected to a negative electrode terminal formed of the outer surface of the negative electrode layer on the other end side of the battery body;
With
At least one of the positive external terminal and the negative external terminal is an embedded terminal in which at least a part thereof is embedded in the laminate film,
The all-solid-state lithium including the embedded metal foil exposed to the outer surface side of the exterior body through the opening through which the embedded terminal penetrates the laminate film in the thickness direction and disposed in the opening along the laminate film An ion secondary battery is provided.
The present invention
A battery body including one or more power generating elements configured by laminating a positive electrode layer, a solid electrolyte layer having lithium ion conductivity, and a negative electrode layer in this order;
It is composed of a laminate film having a metal layer as an intermediate layer, and an exterior body in which the battery body is enclosed,
A positive electrode external terminal electrically connected to a positive electrode terminal formed of an outer surface of the positive electrode layer on one end side of the battery body;
A negative electrode external terminal electrically connected to a negative electrode terminal formed of the outer surface of the negative electrode layer on the other end side of the battery body;
With
At least one of the positive external terminal and the negative external terminal is an embedded terminal in which at least a part thereof is embedded in the laminate film,
The embedded terminal is exposed to the outer surface side of the exterior body through an opening penetrating the laminate film in the thickness direction, and is formed on one surface of the terminal configuration metal foil and the terminal configuration metal foil. Including a terminal configuration sheet having a conductive adhesive layer for configuration;
The terminal component sheet is electrically connected to the positive electrode terminal or the negative electrode terminal through the opening, and the first portion attached to the peripheral edge of the opening on the outer surface of the laminate film. And an all-solid-state lithium ion secondary battery.

  According to the present invention, it is possible to provide an all solid-state lithium ion secondary battery having a structure that can be easily formed thin.

It is a figure which shows the all-solid-state type lithium ion secondary battery which concerns on 1st Embodiment, (a) is sectional drawing, (b) is a top view among these. It is sectional drawing which shows the structure of the vicinity of the external terminal of the all-solid-state lithium ion secondary battery which concerns on 1st Embodiment, (a) shows the vicinity of a positive electrode external terminal, (b) is a negative electrode external terminal. The vicinity of is shown. It is sectional drawing which shows the structure of the vicinity of the external terminal of the all-solid-state lithium ion secondary battery which concerns on 2nd Embodiment, (a) shows the vicinity of a positive electrode external terminal, (b) is a negative electrode external terminal. The vicinity of is shown. It is sectional drawing which shows the structure of the vicinity of the external terminal of the all-solid-state lithium ion secondary battery which concerns on 3rd Embodiment, (a) shows the vicinity of a positive electrode external terminal, (b) is a negative electrode external terminal. The vicinity of is shown. It is sectional drawing which shows the structure of the vicinity of the external terminal of the all-solid-state lithium ion secondary battery which concerns on 4th Embodiment, (a) shows the vicinity of a positive electrode external terminal, (b) is a negative electrode external terminal. The vicinity of is shown. It is sectional drawing which shows the structure of the vicinity of the external terminal of the all-solid-state lithium ion secondary battery which concerns on 5th Embodiment, (a) shows the vicinity of a positive electrode external terminal, (b) is a negative electrode external terminal. The vicinity of is shown. It is sectional drawing which shows the structure of the vicinity of the external terminal of the all-solid-state lithium ion secondary battery which concerns on 6th Embodiment, (a) shows the vicinity of a positive electrode external terminal, (b) is a negative electrode external terminal. The vicinity of is shown. It is sectional drawing which shows the structure of the vicinity of the external terminal of the all-solid-state lithium ion secondary battery which concerns on 7th Embodiment, (a) shows the vicinity of a positive electrode external terminal, (b) is a negative electrode external terminal. The vicinity of is shown. It is sectional drawing which shows the structure of the vicinity of the external terminal of the all-solid-state lithium ion secondary battery which concerns on 8th Embodiment, (a) shows the vicinity of a positive electrode external terminal, (b) is a negative electrode external terminal. The vicinity of is shown. It is sectional drawing which shows the structure of the vicinity of the external terminal of the all-solid-state lithium ion secondary battery which concerns on 9th Embodiment, (a) shows the vicinity of a positive electrode external terminal, (b) is a negative electrode external terminal. The vicinity of is shown. It is a figure which shows the all-solid-state lithium ion secondary battery which concerns on 10th Embodiment, (a) is sectional drawing, (b) is a top view among these. It is sectional drawing which shows the structure of the vicinity of the negative electrode external terminal of the all-solid-state lithium ion secondary battery which concerns on 11th Embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In all the drawings, the same components are denoted by the same reference numerals, and description thereof will be omitted as appropriate.

[First Embodiment]
FIG. 1 is a diagram showing an all solid-state lithium ion secondary battery 100 according to the first embodiment, in which FIG. 1 (b) is a plan view, and FIG. 1 (a) is an A- It is sectional drawing along the A line.
FIG. 2 is a cross-sectional view showing the structure in the vicinity of the external terminal of the all solid-state lithium ion secondary battery 100 according to the first embodiment, in which (a) shows the vicinity of the positive electrode external terminal 50, ) Indicates the vicinity of the negative electrode external terminal 60.

The all-solid-state lithium ion secondary battery 100 according to this embodiment includes a positive electrode layer 11, a solid electrolyte layer 12 having lithium ion conductivity, and a negative electrode layer 13 stacked in this order. The battery body 1 includes one or more elements 10 and a laminate film (for example, the first laminate film 30 and the second laminate film 40) having metal layers 31 and 41 as intermediate layers. The battery body 1 is enclosed. The outer body 20 that is formed, the positive electrode external terminal 50 that is electrically connected to the positive electrode terminal 1 a formed from the outer surface of the positive electrode layer 11 on one end side of the battery body 1, and the negative electrode layer 13 on the other end side of the battery body 1. And a negative electrode external terminal 60 electrically connected to the negative electrode terminal 1b formed from the outer surface of the negative electrode terminal 1b.
At least one of the positive electrode external terminal 50 and the negative electrode external terminal 60 is an embedded terminal in which at least a part thereof is embedded in the laminate film, and the embedded terminal is exposed on the outer surface side of the exterior body 20.

  In the case of this embodiment, the battery body 1 has only one power generation element 10. In the case of this embodiment, the battery main body 1 is comprised only by the electric power generation element 10, for example.

The positive electrode layer 11, the solid electrolyte layer 12, and the negative electrode layer 13 constituting the power generating element 10 are each formed into a thin plate shape by press molding a powder material.
The power generation element 10 is formed in a thin plate shape by laminating a positive electrode layer 11, a solid electrolyte layer 12, and a negative electrode layer 13 in this order and integrating them with each other by press molding or the like.
The planar shape of the power generation element 10 can be any shape. For example, the shape may be a circle or another shape (for example, a rectangular shape). As an example, FIG. 1B shows an example in which the planar shape of the power generation element 10 is circular.

The battery body 1 has a positive electrode terminal 1a and a negative electrode terminal 1b.
The positive electrode terminal 1 a is configured by the outer surface of the positive electrode layer 11 on one end side of the battery main body 1, and the negative electrode terminal 1 b is configured by the outer surface of 13 on the other end side of the battery main body 1.
When the battery body 1 is configured by one power generation element 10 as in the present embodiment, the positive electrode terminal 1 a is configured by one surface of the power generation element 10, and the negative electrode terminal 1 b is the other power generation element 10. It is composed of surfaces.

The exterior body 20 is configured by a laminate film having a metal layer as an intermediate layer. In the case of the present embodiment, the exterior body 20 is constituted by two laminate films, a first laminate film 30 and a second laminate film 40. The exterior body 20 is, for example, one in which the battery body 1 is vacuum packed inside, and the interior of the exterior body 20 has a negative pressure.
The first laminate film 30 includes a metal layer 31 that is an intermediate layer, a first resin layer 33 that covers one surface of the metal layer 31, and a second resin layer 32 that covers the other surface of the metal layer 31. Have.
Similarly, the second laminate film 40 includes a metal layer 41 that is an intermediate layer, a first resin layer 43 that covers one surface of the metal layer 41, and a second resin layer 42 that covers the other surface of the metal layer 41. And having.

The first laminate film 30 and the second laminate film 40 are, for example, formed in the same planar shape, and are arranged so as to overlap each other so that their outlines coincide in plan view.
In a state where the battery body 1 is disposed between the first laminate film 30 and the second laminate film 40, the peripheral portions of the first laminate film 30 and the second laminate film 40 are sealed (heat seal). Etc.), the battery body 1 is sealed between the first laminate film 30 and the second laminate film 40.
A portion where the first laminate film 30 and the second laminate film 40 are sealed with each other is referred to as a seal portion 2. In the seal portion 2, the first laminate film 30 and the second laminate film 40 are bonded to each other.

The first laminate film 30 has an opening 30a that penetrates the first laminate film 30 in the thickness direction. The opening 30a is formed in a portion of the first laminate film 30 that faces the positive electrode terminal 1a.
Similarly, the second laminate film 40 has an opening 40a penetrating the second laminate film 40 in the thickness direction. The opening 40a is formed in a portion of the second laminate film 40 that faces the negative electrode terminal 1b.

A part of the positive electrode external terminal 50 is electrically connected to the positive electrode terminal 1 a and the other part is exposed to the outer surface side of the all solid-state lithium ion secondary battery 100.
Similarly, a part of the negative electrode external terminal 60 is electrically connected to the negative electrode terminal 1 b, and the other part is exposed on the outer surface side of the all solid-state lithium ion secondary battery 100.

In the case of this embodiment, the positive external terminal 50 and the negative external terminal 60 are embedded terminals.
That is, a part of the positive electrode external terminal 50 is embedded in the first laminate film 30. The positive external terminal 50 is exposed on the outer surface side of the first laminate film 30, that is, on the outer surface side of the exterior body 20.
Similarly, a part of the negative electrode external terminal 60 is embedded in the second laminate film 40 and is exposed on the outer surface side of the second laminate film 40, that is, on the outer surface side of the exterior body 20.

More specifically, the positive electrode external terminal 50 is exposed to the outer surface side of the exterior body 20 through an opening 30a that penetrates the first laminate film 30 in the thickness direction.
Similarly, the negative electrode external terminal 60 is exposed to the outer surface side of the exterior body 20 through the opening 40a penetrating the second laminate film 40 in the thickness direction.

  In the case of the present embodiment, the positive electrode external terminal 50 includes an embedded metal foil 51, a sealing conductive adhesive layer 52, and a sealing metal foil 53.

The embedded metal foil 51 is disposed in the opening 30 a along the first laminate film 30.
The thickness of the embedded metal foil 51 is preferably equal to or less than the thickness of the first laminate film 30. However, if necessary, an embedded metal foil 51 thicker than the first laminate film 30 may be used.

In the case of this embodiment, both surfaces of the embedded metal foil 51 are flush with both surfaces of the first laminate film 30.
That is, the upper surface of the embedded metal foil 51 is disposed flush with the upper surface of the peripheral edge of the opening 30 a in the first laminate film 30, and the lower surface of the embedded metal foil 51 is the same as the opening 30 a in the first laminate film 30. It is arranged flush with the lower surface of the peripheral edge.

The outer peripheral end surface of the embedded metal foil 51 is preferably in contact with the inner peripheral wall of the opening 30a, but there is a slight gap between the outer peripheral end surface of the embedded metal foil 51 and the inner peripheral wall of the opening 30a. Also good.
The planar shape of the opening 30a and the embedded metal foil 51 is not particularly limited. FIG. 1B shows an example in which the opening 30a and the embedded metal foil 51 are each rectangular, but the opening 30a and the embedded metal foil 51 may have other shapes such as a circle.

The metal foil 53 for sealing has an opening 30a on the inner surface of the embedded metal foil 51 (lower surface in FIG. 1A) and the inner surface of the first laminate film 30 (lower surface in FIG. 1A). It is affixed through the sealing conductive adhesive layer 52 over the peripheral edge. Thereby, the inner side edge part (lower end part in Fig.1 (a)) of the opening 30a is sealed. Therefore, the inside of the exterior body 20 can be easily maintained at a negative pressure.
In a plan view, the outline of the embedded metal foil 51 is accommodated inside the outline of the metal foil 53 for sealing and the conductive adhesive layer 52 for sealing.

  The surface of the sealing metal foil 53 opposite to the buried metal foil 51 side, that is, the lower surface in FIG. 1A is in contact with the positive electrode terminal 1a (specifically, pressure contact). Thereby, the embedded metal foil 51 is electrically connected to the positive electrode terminal 1 a via the sealing conductive adhesive layer 52 and the sealing metal foil 53.

The planar shapes of the sealing metal foil 53 and the sealing conductive adhesive layer 52 are, for example, equal to each other, and have the same outline in plan view.
The planar shapes of the metal foil 53 for sealing and the conductive adhesive layer 52 for sealing are not particularly limited. FIG. 1B shows an example in which the planar shape of the sealing metal foil 53 and the sealing conductive adhesive layer 52 is circular.
The planar dimensions of the sealing metal foil 53 and the sealing conductive adhesive layer 52 are preferably the same as the planar dimension of the power generation element 10 or slightly larger than the planar dimension of the power generation element 10. Then, in a plan view, the outline of the sealing metal foil 53 and the conductive adhesive layer 52 for sealing and the outline of the power generation element 10 match each other, or the metal foil 53 for sealing and the sealing It is preferable that the outline of the power generating element 10 is contained inside the outline of the conductive adhesive layer 52 for use.

The negative external terminal 60 is configured in the same manner as the positive external terminal 50.
That is, the negative electrode external terminal 60 includes an embedded metal foil 61, a sealing conductive adhesive layer 62, and a sealing metal foil 63.

The embedded metal foil 61 is disposed in the opening 40 a along the second laminate film 40.
The thickness of the embedded metal foil 61 is preferably equal to or less than the thickness of the second laminate film 40. However, an embedded metal foil 61 thicker than the second laminate film 40 may be used as necessary.

In the present embodiment, both surfaces of the embedded metal foil 61 are flush with both surfaces of the second laminate film 40.
That is, the lower surface of the embedded metal foil 61 is arranged flush with the lower surface of the peripheral edge of the opening 40 a in the second laminate film 40, and the upper surface of the embedded metal foil 61 is the same as the opening 40 a in the second laminate film 40. It is arranged flush with the upper surface of the peripheral edge.

The outer peripheral end surface of the embedded metal foil 61 is preferably in contact with the inner peripheral wall of the opening 40a, but there is a slight gap between the outer peripheral end surface of the embedded metal foil 61 and the inner peripheral wall of the opening 40a. Also good.
The planar shape of the opening 40a and the embedded metal foil 61 is not particularly limited. For example, the opening 40a and the embedded metal foil 61 may be rectangular, but may be other shapes such as a circle.

The metal foil 63 for sealing has an opening 40a on the inner surface of the embedded metal foil 61 (upper surface in FIG. 1A) and the inner surface of the second laminate film 40 (upper surface in FIG. 1A). It is affixed through the sealing conductive adhesive layer 62 over the peripheral edge. Thereby, the inner side edge part (upper end part in Fig.1 (a)) of the opening 40a is sealed. Therefore, the inside of the exterior body 20 can be easily maintained at a negative pressure.
In a plan view, the outline of the embedded metal foil 61 is accommodated inside the outline of the metal foil 63 for sealing and the conductive adhesive layer 62 for sealing.

  The surface of the sealing metal foil 63 opposite to the buried metal foil 61 side, that is, the upper surface in FIG. 1A is in contact with the negative electrode terminal 1b (specifically, pressure contact). Thereby, the embedded metal foil 61 is electrically connected to the negative electrode terminal 1b via the sealing conductive adhesive layer 62 and the sealing metal foil 63.

The planar shapes of the sealing metal foil 63 and the sealing conductive adhesive layer 62 are, for example, equal to each other, and have the same outline in plan view.
Although the planar shape of the metal foil 63 for sealing and the electroconductive adhesive layer 62 for sealing is not specifically limited, For example, it can be made circular.
The planar dimensions of the sealing metal foil 63 and the sealing conductive adhesive layer 62 are preferably the same as the planar dimension of the power generation element 10 or slightly larger than the planar dimension of the power generation element 10. Then, in a plan view, the outline of the sealing metal foil 63 and the conductive adhesive layer 62 for sealing and the outline of the power generation element 10 match each other, or the metal foil 63 for sealing and the sealing It is preferable that the outline of the power generating element 10 is contained inside the outline of the conductive adhesive layer 62 for use.

  In the all-solid-state lithium ion secondary battery 100, the thickness of the portion with the largest thickness is preferably 1.0 mm or less, and more preferably 0.5 mm or less.

Here, the preferable thickness dimension of each part of the all solid-state lithium ion secondary battery 100 will be described.
The thickness of the first laminate film 30 is preferably 30 μm or more and 150 μm or less.
The thickness of the metal layer 31 is preferably 10 μm or more and 40 μm or less.
The thickness of the first resin layer 33 is preferably 10 μm or more and 55 μm or less.
The thickness of the second resin layer 32 is preferably 10 μm or more and 55 μm or less.
The preferred thickness of the second laminate film 40 is the same as that of the first laminate film 30, and the preferred thicknesses of the metal layer 41, the first resin layer 43, and the second resin layer 42 are the metal layer 31, The same as the first resin layer 33 and the second resin layer 32.
The thickness of the buried metal foil 51 is preferably 30 μm or more and 150 μm or less.
The preferred thickness of the buried metal foil 61 is the same as that of the buried metal foil 51.
The thickness of the sealing conductive adhesive layer 52 is preferably 10 μm or more and 35 μm or less.
The thickness of the metal foil 53 for sealing is preferably 5 μm or more and 20 μm or less.
The preferred thicknesses of the sealing conductive adhesive layer 62 and the sealing metal foil 63 are the same as those of the sealing conductive adhesive layer 52 and the sealing metal foil 53, respectively.
The thickness of the power generation element 10 is preferably 50 μm or more and 410 μm or less.
The thickness of the positive electrode layer 11 is preferably 10 μm or more and 190 μm or less.
The thickness of the solid electrolyte layer 12 is preferably 30 μm or more and 390 μm or less.
The thickness of the negative electrode layer 13 is preferably 10 μm or more and 190 μm or less.

  Next, an example of the material of each component of the all solid-state lithium ion secondary battery 100 will be described.

The positive electrode layer 11 includes a positive electrode active material, and includes a conductive additive, a solid electrolyte, and the like as necessary. The positive electrode active material is not particularly limited, and generally known materials can be used. As an example, the positive electrode layer 11 can be composed of a mixture of amorphous Li ₆ MoS ₆ powder, acetylene black (AB) powder, and Li ₁₁ P ₃ S ₁₂ powder.

The negative electrode layer 13 is configured to include a negative electrode active material, and includes a conductive additive, a solid electrolyte, and the like as necessary. The negative electrode active material is not particularly limited, and generally known materials can be used. For example, the negative electrode layer 13 can be made of amorphous Li—Si—P sulfide powder. Examples of the powder include a mixture of a Li ₂₂ Si ₅ powder, a graphite powder, and a Li ₁₁ P ₃ S ₁₂ powder.

The solid electrolyte constituting the solid electrolyte layer 12 is not particularly limited as long as it has lithium ion conductivity, and generally known ones can be used. As an example, the solid electrolyte layer 12 can be composed of powder of Li ₁₁ P ₃ S ₁₂ glass.

  The metal which comprises the embedded metal foils 51 and 61 is not specifically limited. As the metal constituting the embedded metal foils 51 and 61, for example, stainless steel (SUS), aluminum, copper, or the like can be used. Among these, stainless steel is preferable from the viewpoint of ensuring sufficient strength, and aluminum or copper is preferable from the viewpoint of ensuring good electrical conductivity.

  The metal which comprises the metal foils 53 and 63 for sealing is not specifically limited. As the metal constituting the metal foils 53 and 63 for sealing, for example, stainless steel (SUS), aluminum, copper, or the like can be used. Among these, aluminum or copper is preferable from the viewpoint of ensuring sufficient electrical conductivity.

The sealing conductive adhesive layers 52 and 62 are made of, for example, an adhesive film formed by dispersing conductive fine particles in an adhesive resin.
Examples of the conductive fine particles include metal particles such as Ni, particles obtained by coating a metal on nonconductive particles, and carbon particles.
The adhesive resin is a resin (adhesive) that can disperse conductive fine particles and exhibits adhesiveness. Examples of such adhesive resins include (meth) acrylic thermoplastic resins (acrylic adhesives). In this specification, “(meth) acryl” is a generic term for acrylic and methacrylic.

  The metal which comprises the metal layer 31 and the metal layer 41 which are intermediate | middle layers of the 1st laminate film 30 and the 2nd laminate film 40 is not specifically limited. As a metal which comprises the metal layer 31 and the metal layer 41, stainless steel (SUS), aluminum, copper etc. can be used, for example. Among these, stainless steel is preferable from the viewpoint of ensuring sufficient strength, and aluminum or copper is preferable from the viewpoint of ensuring good electrical conductivity.

  As a resin material constituting the first resin layer 33 and the first resin layer 43 constituting the inner surface side (sealant layer) in the first laminate film 30 and the second laminate film 40, for example, nylon or polyethylene terephthalate ( PET) can be used.

  Although the resin material which comprises the 2nd resin layer 32 which comprises the outer surface side in the 1st laminate film 30 and the 2nd laminate film 40, and the 2nd resin layer 42 is not specifically limited, For example, PET, polyethylene, nylon, Alternatively, polypropylene can be used.

  It is assumed that the embedded metal foil 51 is electrically connected to the metal layer 31 and the embedded metal foil 61 is electrically connected to the metal layer 41. For this reason, in order to suppress the short circuit between the metal layer 31 and the metal layer 41 (short circuit through another conductor etc.) occurring in the peripheral portion of the all solid-state lithium ion secondary battery 100, It is also preferable that an insulating covering member such as an insulating film is provided (for example, pasted) on the peripheral edge of the lithium ion secondary battery 100.

  Next, an example of a method for manufacturing the all solid state lithium ion secondary battery 100 according to the present embodiment will be described.

  The all-solid-state lithium ion secondary battery 100 includes a power generation element 10, a first laminate film 30, a second laminate film 40, an embedded metal foil 51, an embedded metal foil 61, a conductive adhesive layer 52 for sealing, and sealing. The metal foil 53 for sealing, the conductive adhesive layer 62 for sealing, and the metal foil 63 for sealing are manufactured.

The power generating element 10 (in the case of the present embodiment, the battery main body 1) is manufactured as follows, for example.
First, the solid electrolyte layer 12 is produced by press-molding the powder material of the solid electrolyte layer 12.
Next, the powder material of the negative electrode layer 13 is laminated on the previously produced solid electrolyte layer 12, and the powder material is press-molded. Thereby, the negative electrode layer 13 is integrally formed with the solid electrolyte layer 12.
On the other hand, the positive electrode layer 11 is produced by press-molding the powder material of the positive electrode layer 11.
Next, the positive electrode layer 11 is stacked on the solid electrolyte layer 12 integrated with the negative electrode layer 13, and the negative electrode layer 13, the solid electrolyte layer 12, and the positive electrode layer 11 are pressed. Thereby, the positive electrode layer 11 is integrated with the solid electrolyte layer 12. In this way, the power generating element 10 (battery body 1) in which the positive electrode layer 11, the solid electrolyte layer 12, and the negative electrode layer 13 are laminated in this order is obtained.

On the other hand, after the opening 30a is formed in the first laminate film 30 by punching using a press or the like, the embedded metal foil 51 is disposed in the opening 30a, and one surface of the embedded metal foil 51 and the first laminate are disposed. A metal foil 53 for sealing is attached to the peripheral edge of the opening 30a on one surface of the film 30 via the conductive adhesive layer 52 for sealing.
Similarly, after forming the opening 40 a in the second laminate film 40, the embedded metal foil 61 is disposed in the opening 40 a, and one surface of the embedded metal foil 61 and one surface of the second laminate film 40 are arranged. A metal foil 63 for sealing is pasted via the conductive adhesive layer 62 for sealing over the peripheral edge of the opening 40a.

Next, between the surface of the first laminate film 30 on which the sealing metal foil 53 is attached and the surface of the second laminate film 40 on which the sealing metal foil 63 is attached. In addition, the battery body 1 is disposed. At this time, the sealing metal foil 53 and the positive electrode terminal 1a are opposed to each other, and the sealing metal foil 63 and the negative electrode terminal 1b are opposed to each other. Then, while evacuating the gap between the first laminate film 30 and the second laminate film 40, the peripheral portions of the first laminate film 30 and the second laminate film 40 are sealed, and the seal portion 2 is Form. As a result, the battery body 1 is sealed between the first laminate film 30 and the second laminate film 40.
Thus, an all solid-state lithium ion secondary battery 100 having the structure shown in FIG. 1 is obtained.

  Here, since the gap between the first laminate film 30 and the second laminate film 40 is evacuated, the battery body 1 is in a state of being vacuum-packed in the exterior body 20. Therefore, the sealing metal foil 53 is pressed against the positive electrode terminal 1a, and the sealing metal foil 63 is pressed against the negative electrode terminal 1b.

According to the first embodiment as described above, at least one (for example, both) of the positive electrode external terminal 50 and the negative electrode external terminal 60 of the all-solid-state lithium ion secondary battery 100 is at least a part thereof. It is an embedded terminal embedded in the laminate film (the first laminate film 30 and the second laminate film 40).
Therefore, for at least one of the positive external terminal 50 and the negative external terminal 60, an increase in the thickness dimension of the all-solid-state lithium ion secondary battery 100 due to the overlap between the external terminal and the laminate film is suppressed. it can.
Specifically, an increase in the thickness of the all-solid-state lithium ion secondary battery 100 due to the overlap between the first laminate film 30 and the positive electrode external terminal 50 can be suppressed, and the second laminate film 40 and the negative electrode external terminal 60 can be suppressed. The increase in the thickness dimension of the all-solid-state lithium ion secondary battery 100 due to the overlap can be suppressed.
Therefore, it can be said that the all-solid-state lithium ion secondary battery 100 has a structure that can be easily formed thin.

Here, the thin all-solid-state lithium ion secondary battery 100 as in this embodiment can be easily mounted on various communication terminal devices such as a smart phone, a tablet, and a home appliance remote controller, as well as a smart key or an IC card. It can be expected that it can be mounted on extremely thin communication terminal devices.
The size of the smart key or IC card is based on the JIS standard card size, and the size according to the standard is 75.6 mm (width) × 54 mm (length) × 0.76 mm (thickness). For this reason, if the thickness of the all-solid-state lithium ion secondary battery 100 is, for example, 0.5 mm or less, it can be mounted on an extremely thin communication terminal device such as a smart key or an IC card. I can expect.

The embedded terminal is exposed to the outer surface side of the exterior body 20 through the openings 30a and 40a penetrating the laminate films (the first laminate film 30 and the second laminate film 40) in the thickness direction. Therefore, the embedded terminal can be easily formed by performing a process of inserting a part of the embedded terminal (for example, the embedded metal foils 51 and 61) into the openings 30a and 40a.
In particular, when the embedded terminal includes embedded metal foils 51 and 61 disposed in the openings 30a and 40a, the all solid-state lithium ion secondary battery 100 can be easily manufactured.

[Second Embodiment]
Next, the all solid-state lithium ion secondary battery 100 according to the second embodiment will be described with reference to FIG.
The all solid state lithium ion secondary battery 100 according to the present embodiment is different from the all solid state lithium ion secondary battery 100 according to the first embodiment in the structure of the positive electrode external terminal 50 and the negative electrode external terminal 60. However, other structures are the same as those of the all solid-state lithium ion secondary battery 100 according to the first embodiment.

As shown in FIG. 3A, in the case of this embodiment, the positive electrode external terminal 50 includes a second sealing conductive adhesive layer 54 and a second sealing metal foil 55. Yes.
And the peripheral edge of the opening 30a in the outer surface (upper surface in FIG. 3 (a)) of the embedded metal foil 51 and the outer surface (upper surface in FIG. 3 (a)) of the first laminate film 30 The second sealing metal foil 55 is attached to the portion through the second sealing conductive adhesive layer 54. Thereby, the outer side edge part (upper end part in Fig.3 (a)) of the opening 30a is sealed.
The second sealing conductive adhesive layer 54 and the second sealing metal foil 55 are respectively the same as the sealing conductive adhesive layer 52 and the sealing metal foil 53 in the first embodiment. . In a plan view, the outline of the embedded metal foil 51 is contained inside the outlines of the second sealing metal foil 55 and the second sealing conductive adhesive layer 54.
In the case of this embodiment, the all-solid-state lithium ion secondary battery 100 does not have the sealing conductive adhesive layer 52 and the sealing metal foil 53 in the first embodiment, for example, and is embedded. The metal foil 51 is in pressure contact with the positive electrode terminal 1 a of the power generation element 10.

As shown in FIG. 3B, in the case of this embodiment, the negative electrode external terminal 60 includes a second sealing conductive adhesive layer 64 and a second sealing metal foil 65. Has been.
And the opening 40a in the outer surface (the lower surface in FIG. 3B) of the embedded metal foil 61 and the outer surface of the second laminated film 40 (the lower surface in FIG. 3B). A second sealing metal foil 65 is attached to the peripheral edge via a second sealing conductive adhesive layer 64. Thereby, the outer side edge part (lower end part in Drawing 3 (b)) of opening 40a is sealed.
The second sealing conductive adhesive layer 64 and the second sealing metal foil 65 are respectively the same as the sealing conductive adhesive layer 62 and the sealing metal foil 63 in the first embodiment. . In a plan view, the outline of the embedded metal foil 51 is contained inside the outlines of the second sealing metal foil 55 and the second sealing conductive adhesive layer 54.
In the case of this embodiment, the all-solid-state lithium ion secondary battery 100 does not have the sealing conductive adhesive layer 62 and the sealing metal foil 63 in the first embodiment, for example, and is embedded. The metal foil 61 is in pressure contact with the negative electrode terminal 1 b of the power generation element 10.

  According to the second embodiment as described above, the same effect as the first embodiment can be obtained.

[Third Embodiment]
Next, an all solid-state lithium ion secondary battery 100 according to the third embodiment will be described with reference to FIG.
The all-solid-state lithium ion secondary battery 100 according to the present embodiment is different from the all-solid-state lithium ion secondary battery 100 according to the first embodiment in the points described below. The configuration is the same as that of the all solid-state lithium ion secondary battery 100 according to the first embodiment.

As shown in FIG. 4A, in the case of this embodiment, the positive electrode external terminal 50 further includes a constraining conductive adhesive layer 56 and a constraining metal foil 57.
By attaching a constraining metal foil 57 to the positive electrode terminal 1a (the upper surface of the positive electrode layer 11 in FIG. 4A) via a constraining conductive adhesive layer 56, the positive electrode terminal 1a and thus the positive electrode layer 11 is restrained by the restraining metal foil 57.
The constraining conductive adhesive layer 56 and the constraining metal foil 57 function as a support that suppresses the collapse of the positive electrode layer 11 made of a powder material. For this reason, the collapse of the positive electrode layer 11 is suppressed.
The restraining metal foil 57 is in contact with the sealing metal foil 53. That is, in FIG. 4A, the upper surface of the restraining metal foil 57 and the lower surface of the sealing metal foil 53 are in contact with each other (for example, pressure contact).

  In the present embodiment, a constraining conductive adhesive layer 56 and a constraining metal foil 57 are interposed between the positive electrode terminal 1 a and the sealing metal foil 53. Therefore, the buried metal foil 51 is connected to the positive electrode terminal 1a through the sealing conductive adhesive layer 52, the sealing metal foil 53, the restraining metal foil 57, and the restraining conductive adhesive layer 56 in this order. Electrically connected.

The constraining conductive adhesive layer 56 and the constraining metal foil 57 are respectively the same as the sealing conductive adhesive layer 52 and the sealing metal foil 53 in the first embodiment.
In a plan view, the contour lines of the constraining conductive adhesive layer 56 and the constraining metal foil 57 may be within the contour lines of the sealing conductive adhesive layer 52 and the sealing metal foil 53. And it may overlap with the outline of the conductive adhesive layer 52 for sealing and the metal foil 53 for sealing.

As shown in FIG. 4B, in the present embodiment, the negative electrode external terminal 60 further includes a constraining conductive adhesive layer 66 and a constraining metal foil 67.
By attaching a constraining metal foil 67 to the negative electrode terminal 1b (the lower surface of the negative electrode layer 13 in FIG. 4B) via a constraining conductive adhesive layer 66, the negative electrode terminal 1b and thus the negative electrode layer 13 is restrained by the restraining metal foil 67.
That is, the constraining conductive adhesive layer 66 and the constraining metal foil 67 function as a support that suppresses the collapse of the negative electrode layer 13 made of a powder material. For this reason, the collapse of the negative electrode layer 13 is suppressed.
The restraining metal foil 67 is in contact with the sealing metal foil 63. That is, in FIG. 4B, the upper surface of the restraining metal foil 67 and the lower surface of the sealing metal foil 63 are in contact with each other (for example, pressure contact).

  In the present embodiment, a constraining conductive adhesive layer 66 and a constraining metal foil 67 are interposed between the negative electrode terminal 1 b and the sealing metal foil 63. Therefore, the embedded metal foil 61 is connected to the negative electrode terminal 1b through the sealing conductive adhesive layer 62, the sealing metal foil 63, the constraining metal foil 67, and the constraining conductive adhesive layer 66 in this order. Electrically connected.

The constraining conductive adhesive layer 66 and the constraining metal foil 67 are the same as the sealing conductive adhesive layer 62 and the sealing metal foil 63 in the first embodiment, respectively.
In a plan view, the contour lines of the constraining conductive adhesive layer 66 and the constraining metal foil 67 may be within the contour lines of the sealing conductive adhesive layer 62 and the sealing metal foil 63. And it may overlap with the outline of the conductive adhesive layer 62 for sealing and the metal foil 63 for sealing.

  According to the third embodiment as described above, in addition to the same effects as those of the first embodiment, it is possible to obtain the effect that the collapse of the positive electrode layer 11 and the negative electrode layer 13 can be suppressed. .

[Fourth Embodiment]
Next, an all solid-state lithium ion secondary battery 100 according to the fourth embodiment will be described with reference to FIG.
The all-solid-state lithium ion secondary battery 100 according to the present embodiment is different from the all-solid-state lithium ion secondary battery 100 according to the first embodiment in the points described below. The configuration is the same as that of the all solid-state lithium ion secondary battery 100 according to the first embodiment.

As shown in FIG. 5A, in the present embodiment, the positive electrode external terminal 50 includes a terminal configuration sheet 58 instead of including the embedded metal foil 51.
The terminal configuration sheet 58 includes a terminal configuration metal foil 581 and a terminal configuration conductive adhesive layer 582 formed on one surface of the terminal configuration metal foil 581.
The terminal component sheet 58 includes a first portion 58a attached to the peripheral edge of the opening 30a on the outer surface (the upper surface in FIG. 5A) of the first laminate film 30, and a positive electrode terminal through the opening 30a. And a second portion 58b electrically connected to 1a.
The outer end portion of the opening 30a is sealed by the terminal configuration sheet 58.
The second portion 58 b is configured by the center portion of the terminal configuration sheet 58. The 1st part 58a is comprised by the peripheral part of the terminal structure sheet 58, and has enclosed the circumference | surroundings of the 2nd part 58b.

Over the inner surface of the second portion 58b (the lower surface in FIG. 5A) and the peripheral edge of the opening 30a in the inner surface of the first laminate film 30 (the lower surface in FIG. 5A), A metal foil 53 for sealing is attached via the conductive adhesive layer 52 for sealing. Thereby, the inner side edge part of the opening 30a is sealed.
The second portion 58 b is electrically connected to the positive electrode terminal 1 a via the sealing conductive adhesive layer 52 and the sealing metal foil 53.

  The thickness of the terminal component sheet 58 is preferably thinner than the thickness of the first laminate film 30, whereby the all solid-state lithium ion secondary battery 100 can be made thinner.

  The terminal configuration sheet 58 may further include a third portion 58 c attached to the inner peripheral surface of the opening 30 a in the first laminate film 30. In this case, the third portion 58c surrounds the second portion 58b, and the first portion 58a surrounds the third portion 58c.

The terminal constituent conductive adhesive layer 582 and the terminal constituent metal foil 581 are the same as the sealing conductive adhesive layer 52 and the sealing metal foil 53 in the first embodiment, respectively.
In addition, it is preferable that the metal foil 581 for terminal structure is comprised with the stainless steel foil from a viewpoint of obtaining sufficient intensity | strength.

As shown in FIG. 5B, in the case of this embodiment, the negative electrode external terminal 60 includes a terminal configuration sheet 68 instead of the embedded metal foil 61.
The terminal configuration sheet 68 includes a terminal configuration metal foil 681 and a terminal configuration conductive adhesive layer 682 formed on one surface of the terminal configuration metal foil 681.
The terminal configuration sheet 68 includes a first portion 68a attached to the peripheral edge of the opening 40a on the outer surface (the lower surface in FIG. 5B) of the second laminate film 40, and a negative terminal via the opening 40a. And a second portion 68b electrically connected to 1b.
The terminal configuration sheet 68 seals the outer end of the opening 40a.
The second portion 68 b is configured by the center portion of the terminal configuration sheet 68. The first portion 68a is configured by the peripheral edge portion of the terminal configuration sheet 68, and surrounds the second portion 68b.

Over the inner surface of the second portion 68b (upper surface in FIG. 5B) and the peripheral edge of the opening 40a in the inner surface of the second laminate film 40 (upper surface in FIG. 5B), A metal foil 63 for sealing is attached via a conductive adhesive layer 62 for sealing. Thereby, the inner side edge part of the opening 40a is sealed.
The second portion 68 b is electrically connected to the negative electrode terminal 1 b through the sealing conductive adhesive layer 62 and the sealing metal foil 63.

  The thickness of the terminal configuration sheet 68 is preferably thinner than the thickness of the second laminate film 40, whereby the all solid-state lithium ion secondary battery 100 can be made thinner.

  The terminal configuration sheet 68 may further include a third portion 68 c attached to the inner peripheral surface of the opening 40 a in the second laminate film 40. In this case, the third portion 68c surrounds the second portion 68b, and the first portion 68a surrounds the third portion 68c.

The terminal-constituting conductive adhesive layer 682 and the terminal-constituting metal foil 681 are the same as the sealing conductive adhesive layer 62 and the sealing metal foil 63 in the first embodiment, respectively.
In addition, it is preferable that the metal foil 681 for a terminal structure is comprised with the stainless steel foil from a viewpoint of obtaining sufficient intensity | strength.

  According to the fourth embodiment as described above, the same effects as those of the first embodiment can be obtained.

[Fifth Embodiment]
Next, an all solid-state lithium ion secondary battery 100 according to the fifth embodiment will be described with reference to FIG.
The all-solid-state lithium ion secondary battery 100 according to the present embodiment is different from the all-solid-state lithium ion secondary battery 100 according to the above-described fourth embodiment in the points described below. This is configured in the same manner as the all solid-state lithium ion secondary battery 100 according to the fourth embodiment.

As shown in FIG. 6A, in the present embodiment, the positive electrode external terminal 50 further includes a constraining conductive adhesive layer 56 and a constraining metal foil 57. By binding the constraining metal foil 57 to the positive electrode terminal 1 a via the constraining conductive adhesive layer 56, the positive electrode terminal 1 a and, consequently, the positive electrode layer 11 are constrained by the constraining metal foil 57.
Further, as shown in FIG. 6B, the negative electrode external terminal 60 further includes a constraining conductive adhesive layer 66 and a constraining metal foil 67. By attaching the constraining metal foil 67 to the negative electrode terminal 1 b via the constraining conductive adhesive layer 66, the negative electrode terminal 1 b and consequently the negative electrode layer 13 are constrained by the constraining metal foil 67.
The constraining conductive adhesive layer 56, the constraining metal foil 57, the constraining conductive adhesive layer 66, and the constraining metal foil 67 are as described in the third embodiment.

  According to the fifth embodiment as described above, the same effect as that of the fourth embodiment can be obtained, and the effect that the positive electrode layer 11 and the negative electrode layer 13 can be prevented from collapsing can be obtained. .

[Sixth Embodiment]
Next, an all solid-state lithium ion secondary battery 100 according to the sixth embodiment will be described with reference to FIG.
The all-solid-state lithium ion secondary battery 100 according to the present embodiment is different from the all-solid-state lithium ion secondary battery 100 according to the first embodiment in the points described below. The configuration is the same as that of the all solid-state lithium ion secondary battery 100 according to the first embodiment.

In the first embodiment, the example in which the thickness of the embedded metal foil 51 is equal to the thickness of the first laminate film 30 has been described. However, in the present embodiment, the thickness of the embedded metal foil 51 is the first. It is thinner than the thickness of the laminate film 30. And both surfaces of the embedded metal foil 51 are accommodated in the opening 30a.
Along with this, in the conductive adhesive layer 52 for sealing and the metal foil 53 for sealing, a portion corresponding to the opening 30a enters the opening 30a.
A gap 70 is formed between the positive electrode terminal 1 a and the sealing metal foil 53.

In the case of this embodiment, the positive electrode external terminal 50 also includes the second sealing conductive adhesive layer 54 and the second sealing metal foil 55 described in the second embodiment.
In the second sealing conductive adhesive layer 54 and the second sealing metal foil 55, the portion corresponding to the opening 30 a enters the opening 30 a.

Similarly, the thickness of the embedded metal foil 61 is thinner than the thickness of the second laminate film 40. And both surfaces of the embedded metal foil 61 are accommodated in the opening 40a.
Accordingly, in the conductive adhesive layer 62 for sealing and the metal foil 63 for sealing, a portion corresponding to the opening 40a enters the opening 40a.
A gap 70 is formed between the negative electrode terminal 1 b and the sealing metal foil 63.

In the case of this embodiment, the negative electrode external terminal 60 also includes the second sealing conductive adhesive layer 64 and the second sealing metal foil 65 described in the second embodiment.
In the second sealing conductive adhesive layer 64 and the second sealing metal foil 65, a portion corresponding to the opening 40a enters the opening 40a.

  According to the sixth embodiment as described above, the same effects as those of the first embodiment can be obtained.

[Seventh Embodiment]
Next, an all solid-state lithium ion secondary battery 100 according to the seventh embodiment will be described with reference to FIG.
The all-solid-state lithium ion secondary battery 100 according to this embodiment is different from the all-solid-state lithium ion secondary battery 100 according to the seventh embodiment in the points described below. This is configured in the same manner as the all solid-state lithium ion secondary battery 100 according to the seventh embodiment.

In the case of this embodiment, the positive electrode external terminal 50 further includes a constraining conductive adhesive layer 56 and a constraining metal foil 57.
A gap 70 is formed between the constraining metal foil 57 and the sealing metal foil 53.

Similarly, the negative electrode external terminal 60 further includes a constraining conductive adhesive layer 66 and a constraining metal foil 67.
A gap 70 is formed between the constraining metal foil 67 and the sealing metal foil 63.

  The constraining conductive adhesive layer 56, the constraining metal foil 57, the constraining conductive adhesive layer 66, and the constraining metal foil 67 are as described in the third embodiment.

  According to the seventh embodiment as described above, the same effect as in the sixth embodiment can be obtained, and the effect that the positive electrode layer 11 and the negative electrode layer 13 can be prevented from collapsing can be obtained. .

[Eighth Embodiment]
Next, an all solid-state lithium ion secondary battery 100 according to an eighth embodiment will be described with reference to FIG.
The all-solid-state lithium ion secondary battery 100 according to the present embodiment is different from the all-solid-state lithium ion secondary battery 100 according to the first embodiment in the points described below. The configuration is the same as that of the all solid-state lithium ion secondary battery 100 according to the first embodiment.

In the case of this embodiment, the positive electrode external terminal 50 is configured by the metal layer 31 of the first laminate film 30, the sealing conductive adhesive layer 52, and the sealing metal foil 53.
That is, a part of the metal layer 31 constitutes the positive external terminal 50 that is an embedded terminal.

A first opening 33 a is formed in the first resin layer 33 of the first laminate film 30. A part of the metal layer 31 is electrically connected to the positive electrode terminal 1a through the first opening 33a.
As described above, since the inside of the exterior body 20 is set to a negative pressure, the metal layer 31 is drawn toward the positive electrode terminal 1a side as shown in FIG. It is closely attached to.

  A second opening 32 a is formed in the second resin layer 32 of the first laminate film 30. Thereby, a part of the metal layer 31 is exposed to the outer surface side of the exterior body 20 through the second opening 32a.

  In the case of this embodiment, the first opening 33a and the second opening 32a are arranged at positions that overlap each other in plan view. More specifically, for example, in a plan view, the outline of the first opening 33a and the outline of the second opening 32a coincide with each other.

  The metal layer 31 is preferably made of a stainless steel foil. By doing so, sufficient strength of the metal layer 31 can be obtained.

In the case of this embodiment, the positive electrode external terminal 50 includes a sealing conductive adhesive layer 52 and a sealing metal foil 53 as in the first embodiment.
And the conductive adhesive for sealing over the inner surface of the portion located in the first opening 33 a in the metal layer 31 and the peripheral edge of the first opening 33 a in the inner surface of the first laminate film 30. By sealing the metal foil 53 for sealing through the layer 52, the inner end of the first opening 33a is sealed.
And the part located in the 1st opening 33a in the metal layer 31 is electrically connected with respect to the positive electrode terminal 1a through the electroconductive adhesion layer 52 for sealing, and the metal foil 53 for sealing.

In the case of this embodiment, the negative electrode external terminal 60 is configured by the metal layer 41 of the second laminate film 40, the sealing conductive adhesive layer 62, and the sealing metal foil 63.
That is, a part of the metal layer 41 constitutes the negative external terminal 60 that is a buried terminal.

A first opening 43 a is formed in the first resin layer 43 of the second laminate film 40. A part of the metal layer 41 is electrically connected to the negative electrode terminal 1b through the first opening 43a.
As described above, since the inside of the exterior body 20 is set to a negative pressure, the metal layer 41 is drawn toward the negative electrode terminal 1b side as shown in FIG. It is closely attached to.

  A second opening 42 a is formed in the second resin layer 42 of the second laminate film 40. Thereby, a part of the metal layer 41 is exposed to the outer surface side of the exterior body 20 through the second opening 42a.

  In the case of this embodiment, the first opening 43a and the second opening 42a are arranged at positions that overlap each other in plan view. More specifically, for example, in a plan view, the outline of the first opening 43a and the outline of the second opening 42a coincide with each other.

  The metal layer 41 is preferably made of a stainless steel foil. By doing so, sufficient strength of the metal layer 41 can be obtained.

In the case of this embodiment, the negative electrode external terminal 60 includes a sealing conductive adhesive layer 62 and a sealing metal foil 63 as in the first embodiment.
And the conductive adhesive for sealing over the inner surface of the portion located in the first opening 43a in the metal layer 41 and the peripheral edge of the first opening 43a in the inner surface of the second laminate film 40. By sealing metal foil 63 through layer 62, the inner end of first opening 43a is sealed.
And the part located in the 1st opening 43a in the metal layer 41 is electrically connected with respect to the negative electrode terminal 1b through the electroconductive adhesive layer 62 for sealing, and the metal foil 63 for sealing.

The method for forming the first opening 33a and the second opening 32a in the first laminate film 30 is not particularly limited. For example, the first resin layer 33 in which the first opening 33 a is formed in advance and the second resin layer 32 in which the second opening 32 a is formed in advance are stacked and attached to the metal layer 31, thereby The first laminate film 30 having the opening 33a and the second opening 32a can be obtained. Alternatively, the first opening 33a and the second opening 32a may be formed by performing dry etching on the first laminate film 30.
The same applies to the method of obtaining the second laminate film 40 having the first opening 43a and the second opening 42a.

According to the eighth embodiment as described above, in addition to the same effects as those of the first embodiment, the following effects can be obtained.
That is, since a part of the first laminate film 30 and the second laminate film 40 constitutes the positive electrode external terminal 50 and the negative electrode external terminal 60, the number of parts of the all solid-state lithium ion secondary battery 100 can be reduced. Can do.

[Ninth Embodiment]
Next, an all solid-state lithium ion secondary battery 100 according to a ninth embodiment will be described with reference to FIG.
The all-solid-state lithium ion secondary battery 100 according to this embodiment is different from the all-solid-state lithium ion secondary battery 100 according to the eighth embodiment in the points described below. This is configured in the same manner as the all solid-state lithium ion secondary battery 100 according to the eighth embodiment.

In the case of this embodiment, the positive electrode external terminal 50 does not include the sealing conductive adhesive layer 52 and the sealing metal foil 53.
A part of the metal layer 31 is electrically connected to the positive electrode terminal 1a through the first opening 33a.

Similarly, the negative electrode external terminal 60 does not have the sealing conductive adhesive layer 62 and the sealing metal foil 63.
A part of the metal layer 41 is electrically connected to the negative electrode terminal 1b through the first opening 43a.

  The metal layers 31 and 41 are the second sealing metal foil 55 and the second sealing conductive adhesive layer 54 in the second embodiment, and the second sealing metal foil 65 and the second sealing metal. Like the conductive adhesive layer 64, it has a function of sealing the opening of the laminate film.

According to the ninth embodiment as described above, in addition to the same effects as in the eighth embodiment, the following effects can be obtained.
That is, the positive electrode external terminal 50 does not have the sealing conductive adhesive layer 52 and the sealing metal foil 53, and the negative electrode external terminal 60 has the sealing conductive adhesive layer 62 and the sealing metal foil 63. Since it does not have, the all-solid-state lithium ion secondary battery 100 can be further reduced in thickness.

[Tenth embodiment]
Next, the all solid-state lithium ion secondary battery 100 according to the tenth embodiment will be described with reference to FIG.
The all-solid-state lithium ion secondary battery 100 according to the present embodiment is different from the all-solid-state lithium ion secondary battery 100 according to the first embodiment in the points described below. The configuration is the same as that of the all solid-state lithium ion secondary battery 100 according to the first embodiment.

In the above description, the example in which the positive electrode external terminal 50 and the negative electrode external terminal 60 are exposed on the opposite surfaces of the all solid-state lithium ion secondary battery 100 has been described.
On the other hand, in the present embodiment, the positive external terminal 50 and the negative external terminal 60 are exposed on the same surface (for example, the lower surface in FIG. 11A) of the all solid-state lithium ion secondary battery 100. Yes.
That is, for example, the second laminate film 40 is formed with two openings 40b and 40c spaced apart from each other, and the negative external terminal 60 is exposed to the outer surface side of the exterior body 20 through the one opening 40b. In addition, the positive external terminal 50 is exposed to the outer surface side of the exterior body 20 through the other opening 40c.
A buried metal foil 61 constituting the negative electrode external terminal 60 is disposed in one opening 40b, and a buried metal foil 51 constituting the positive electrode external terminal 50 is disposed in the other opening 40c.

In the case of this embodiment, the all-solid-state lithium ion secondary battery 100 includes two power generation elements 10, and these power generation elements 10 are vertically inverted and arranged on the same plane. The two power generating elements 10 are connected in series to constitute the battery body 1.
For example, the two power generating elements 10 are connected in series by attaching the connecting metal foil 81 between the two power generating elements 10 via the connecting conductive adhesive layer 82.

The positive electrode terminal 1a of the battery body 1 is configured by the outer surface (the lower surface in FIG. 11) of the positive electrode layer 11 of one power generation element 10 (the right side in FIG. 11). The negative electrode terminal 1b of the battery body 1 is constituted by the outer surface (the lower surface in FIG. 11A) of the negative electrode layer 13 of the other power generation element 10 (left side in FIG. 11).
A buried metal foil 51 is electrically connected to the positive electrode terminal 1a via a sealing metal foil 53 and a conductive adhesive layer 52 for sealing, and a sealing metal foil 63 and a sealing material are connected to the negative electrode terminal 1b. The embedded metal foil 61 is electrically connected through the conductive adhesive layer 62 for use.

  In the case of this embodiment, in order to suppress contact (short circuit) between the two power generation elements 10, it is also preferable to dispose an insulating partition member (not shown) between the power generation elements 10.

  According to this embodiment, the same effect as that of the first embodiment can be obtained.

The inventor actually fabricated the all-solid-state lithium ion secondary battery 100 according to the present embodiment and evaluated its performance. The voltage was 3 V, the capacity was 1.8 mAh, the flat area was 7.6 cm ² , and the thickness was 0. The energy density was 15 Wh / L.

In addition, the battery main body 1 can be configured by three or more power generation elements 10 by alternately inverting a plurality of power generation elements 10 connected in series with each other and arranging them on the same plane.
In addition, a plurality of power generation elements 10 are arranged in the same direction and on the same plane without being inverted upside down, and a positive current collector that is commonly connected to the positive electrode layer 11 of the plurality of power generation elements 10 is provided. It is also possible to connect a plurality of power generating elements 10 in parallel by providing a negative electrode current collector that is commonly connected to the negative electrode layer 13.

[Eleventh embodiment]
Next, an all solid-state lithium ion secondary battery 100 according to the eleventh embodiment will be described with reference to FIG.
The all-solid-state lithium ion secondary battery 100 according to this embodiment is different from the all-solid-state lithium ion secondary battery 100 according to the ninth embodiment in the points described below. This is configured in the same manner as the all-solid-state lithium ion secondary battery 100 according to the ninth embodiment.

In the ninth embodiment, the metal layer 41 constituting the negative electrode external terminal 60 is exposed to the outer surface side of the exterior body 20 through the second opening 42a disposed at a position overlapping the first opening 43a in plan view. Explained the example.
On the other hand, in the present embodiment, the second opening 42 a is filled with the covering layer 90. And the metal layer 41 which comprises the negative electrode external terminal 60 is exposed to the outer surface side of the exterior body 20 through the 3rd opening 42b formed in the 2nd resin layer 42 in the position away from the 2nd opening 42a. .
By setting it as such a structure, arrangement | positioning of the part exposed to the outer surface side of the exterior body 20 in the negative electrode external terminal 60 can be set freely, for example, can also be arrange | positioned in the seal part 2. FIG.

  Moreover, although illustration is abbreviate | omitted, similarly, arrangement | positioning of the part exposed to the outer surface side of the exterior body 20 in the positive electrode external terminal 50 can also be freely set.

The configuration of the positive external terminal 50 described in each of the above embodiments can be arbitrarily combined (added) with the configuration of the positive external terminal 50 described in the other embodiments. Similarly, the configuration of the negative electrode external terminal 60 described in each of the above embodiments can be arbitrarily combined (added) with the configuration of the negative electrode external terminal 60 described in the other embodiments.
In each of the above embodiments, the example in which the positive external terminal 50 and the negative external terminal 60 have the same structure has been described. However, the structure of the positive external terminal 50 and the structure of the negative external terminal 60 are different from each other. May be. For example, the positive electrode external terminal 50 may have the structure of any one of the above embodiments, and the negative electrode external terminal 60 may have the structure of another embodiment.
Hereinafter, examples of the reference form will be added.
1. A battery body including one or more power generating elements configured by laminating a positive electrode layer, a solid electrolyte layer having lithium ion conductivity, and a negative electrode layer in this order;
It is composed of a laminate film having a metal layer as an intermediate layer, and an exterior body in which the battery body is enclosed,
A positive electrode external terminal electrically connected to a positive electrode terminal formed of an outer surface of the positive electrode layer on one end side of the battery body;
A negative electrode external terminal electrically connected to a negative electrode terminal formed of the outer surface of the negative electrode layer on the other end side of the battery body;
With
At least one of the positive external terminal and the negative external terminal is an embedded terminal in which at least a part thereof is embedded in the laminate film,
An all-solid-state lithium ion secondary battery in which the embedded terminal is exposed on the outer surface side of the exterior body.
2. The embedded terminal is exposed to the outer surface side of the exterior body through an opening penetrating the laminate film in the thickness direction. All-solid-state lithium ion secondary battery described in 1.
3. The embedded terminal includes an embedded metal foil disposed in the opening along the laminate film. All-solid-state lithium ion secondary battery described in 1.
4). The embedded terminal includes a conductive adhesive layer for sealing, and a metal foil for sealing,
The metal foil for sealing is attached via the conductive adhesive layer for sealing across the inner surface of the embedded metal foil and the peripheral edge of the opening on the inner surface of the laminate film. The inner end of the opening is sealed,
2. The embedded metal foil is electrically connected to the positive electrode terminal or the negative electrode terminal via the sealing conductive adhesive layer and the sealing metal foil. All-solid-state lithium ion secondary battery described in 1.
5. The buried terminal includes a constraining conductive adhesive layer and a constraining metal foil,
The restraining metal foil is attached to the positive electrode terminal or the negative electrode terminal via the restraining conductive adhesive layer, so that the positive electrode terminal or the negative electrode terminal is restrained by the restraining metal foil. ,
3. The restraining metal foil is in contact with the sealing metal foil. All-solid-state lithium ion secondary battery described in 1.
6). The buried terminal includes a second sealing conductive adhesive layer and a second sealing metal foil,
The second sealing metal foil through the second sealing conductive adhesive layer across the outer surface of the embedded metal foil and the peripheral edge of the opening on the outer surface of the laminate film 2. The outer end portion of the opening is sealed by being attached. To 5. The all-solid-state lithium ion secondary battery as described in any one of these.
7). The buried terminal includes a terminal configuration sheet having a terminal configuration metal foil and a terminal configuration conductive adhesive layer formed on one surface of the terminal configuration metal foil,
The terminal component sheet is electrically connected to the positive electrode terminal or the negative electrode terminal through the opening, and the first portion attached to the peripheral edge of the opening on the outer surface of the laminate film. And a second part. All-solid-state lithium ion secondary battery described in 1.
8). The embedded terminal includes a conductive adhesive layer for sealing, and a metal foil for sealing,
The metal foil for sealing is affixed through the conductive adhesive layer for sealing across the inner surface of the second part and the peripheral edge of the opening on the inner surface of the laminate film. The inner end of the opening is sealed,
The second portion is electrically connected to the positive electrode terminal or the negative electrode terminal via the sealing conductive adhesive layer and the sealing metal foil. All-solid-state lithium ion secondary battery described in 1.
9. The buried terminal includes a constraining conductive adhesive layer and a constraining metal foil,
When the constraining metal foil is attached to the positive electrode terminal or the negative electrode terminal via the constraining conductive adhesive layer, the positive electrode terminal or the negative electrode terminal is constrained by the constraining metal foil. 8. All-solid-state lithium ion secondary battery described in 1.
10. The laminate film has a first resin layer that covers one surface of the metal layer, and a second resin layer that covers the other surface of the metal layer,
A part of the metal layer constitutes the buried terminal, and is electrically connected to the positive terminal or the negative terminal through a first opening formed in the first resin layer, and 1. Exposed to the outer surface side of the exterior body through a second opening formed in the second resin layer. All-solid-state lithium ion secondary battery described in 1.
11. The exterior body includes the first laminate film and the second laminate film,
The battery body is sealed between the first laminate film and the second laminate film by sealing the peripheral edges of the first laminate film and the second laminate film. ,
Each of the first laminate film and the second laminate film has a first resin layer that covers one surface of the metal layer, and a second resin layer that covers the other surface of the metal layer. ,
A part of the metal layer of the first laminate film constitutes the buried terminal, and is connected to the positive electrode terminal through a first opening formed in the first resin layer of the first laminate film. Electrically exposed to and exposed to the outer surface of the exterior body through a second opening formed in the second resin layer of the first laminate film,
A part of the metal layer of the second laminate film constitutes the buried terminal, and is connected to the negative electrode terminal through a first opening formed in the first resin layer of the second laminate film. 1 and is exposed to the outer surface side of the exterior body through a second opening formed in the second resin layer of the second laminate film. All-solid-state lithium ion secondary battery described in 1.
12 The embedded terminal includes a conductive adhesive layer for sealing, and a metal foil for sealing,
Through the conductive adhesive layer for sealing, across the inner surface of the portion located in the first opening in the metal layer and the peripheral edge of the first opening in the inner surface of the laminate film By sticking the metal foil for sealing, the inner end of the first opening is sealed,
A portion of the metal layer located in the first opening is electrically connected to the positive electrode terminal or the negative electrode terminal via the sealing conductive adhesive layer and the sealing metal foil. 10. Or 11. All-solid-state lithium ion secondary battery described in 1.
13. The metal layer is made of stainless steel foil10. To 12. The all-solid-state lithium ion secondary battery as described in any one of these.
14 1. The thickness of the maximum thickness portion in the all solid-state lithium ion secondary battery is 1.0 mm or less. Thru 13. The all-solid-state lithium ion secondary battery as described in any one of these.

DESCRIPTION OF SYMBOLS 1 Battery main body 1a Positive electrode terminal 1b Negative electrode terminal 2 Seal part 10 Power generation element 11 Positive electrode layer 12 Solid electrolyte layer 13 Negative electrode layer 20 Exterior body 30 1st laminate film (laminate film)
30a opening 31 metal layer 32 second resin layer 32a second opening 33 first resin layer 33a first opening 40 second laminate film (laminate film)
40a opening 41 metal layer 42 second resin layer 42a second opening 42b third opening 43 first resin layer 43a first opening 50 positive electrode external terminal 51 metal foil 52 sealing conductive adhesive layer 53 sealing metal foil 54 first 2 Sealing conductive adhesive layer 55 Second sealing metal foil 56 Restraining conductive adhesive layer 57 Restraining metal foil 58 Terminal configuration sheet 58a First portion 58b Second portion 58c Third portion 581 Terminal configuration metal foil 582 Electroconductive adhesive layer 60 for terminal configuration Negative electrode external terminal 61 Metal foil 62 Conductive adhesive layer 63 for sealing Metal foil 64 for sealing Second conductive adhesive layer 65 for sealing Second metal foil 66 for sealing Conductive adhesive layer 67 Restraining metal foil 68 Terminal configuration sheet 68a First portion 68b Second portion 68c Third portion 681 Terminal configuration metal foil 682 Terminal configuration conductive adhesive layer 70 Air gap 81 Connection metal foil 82 For connection Conductive adhesive layer 90 covering layer 100 all-solid-state lithium ion secondary battery

Claims (8)

A battery body including one or more power generating elements configured by laminating a positive electrode layer, a solid electrolyte layer having lithium ion conductivity, and a negative electrode layer in this order;
It is composed of a laminate film having a metal layer as an intermediate layer, and an exterior body in which the battery body is enclosed,
A positive electrode external terminal electrically connected to a positive electrode terminal formed of an outer surface of the positive electrode layer on one end side of the battery body;
A negative electrode external terminal electrically connected to a negative electrode terminal formed of the outer surface of the negative electrode layer on the other end side of the battery body;
With
At least one of the positive external terminal and the negative external terminal is an embedded terminal in which at least a part thereof is embedded in the laminate film,
The all-solid-state lithium including the embedded metal foil exposed to the outer surface side of the exterior body through the opening through which the embedded terminal penetrates the laminate film in the thickness direction and disposed in the opening along the laminate film Ion secondary battery. The embedded terminal includes a conductive adhesive layer for sealing, and a metal foil for sealing,
The metal foil for sealing is attached via the conductive adhesive layer for sealing across the inner surface of the embedded metal foil and the peripheral edge of the opening on the inner surface of the laminate film. The inner end of the opening is sealed,
The all-solid-state of Claim 1 with which the said embedded metal foil is electrically connected with respect to the said positive electrode terminal or the said negative electrode terminal via the said electroconductive adhesion layer for sealing, and the said metal foil for sealing. Type lithium ion secondary battery. The buried terminal includes a constraining conductive adhesive layer and a constraining metal foil,
The restraining metal foil is attached to the positive electrode terminal or the negative electrode terminal via the restraining conductive adhesive layer, so that the positive electrode terminal or the negative electrode terminal is restrained by the restraining metal foil. ,
The all-solid-state lithium ion secondary battery according to claim 2 , wherein the constraining metal foil is in contact with the sealing metal foil. The buried terminal includes a second sealing conductive adhesive layer and a second sealing metal foil,
The second sealing metal foil through the second sealing conductive adhesive layer across the outer surface of the embedded metal foil and the peripheral edge of the opening on the outer surface of the laminate film The all-solid-state lithium ion secondary battery as described in any one of Claims 1 thru | or 3 by which the outer side edge part of the said opening is sealed by affixing. A battery body including one or more power generating elements configured by laminating a positive electrode layer, a solid electrolyte layer having lithium ion conductivity, and a negative electrode layer in this order;
It is composed of a laminate film having a metal layer as an intermediate layer, and an exterior body in which the battery body is enclosed,
A positive electrode external terminal electrically connected to a positive electrode terminal formed of an outer surface of the positive electrode layer on one end side of the battery body;
A negative electrode external terminal electrically connected to a negative electrode terminal formed of the outer surface of the negative electrode layer on the other end side of the battery body;
With
At least one of the positive external terminal and the negative external terminal is an embedded terminal in which at least a part thereof is embedded in the laminate film,
The embedded terminal is exposed to the outer surface side of the exterior body through an opening penetrating the laminate film in the thickness direction, and is formed on one surface of the terminal configuration metal foil and the terminal configuration metal foil. Including a terminal configuration sheet having a conductive adhesive layer for configuration;
The terminal component sheet is electrically connected to the positive electrode terminal or the negative electrode terminal through the opening, and the first portion attached to the peripheral edge of the opening on the outer surface of the laminate film. And an all-solid-state lithium ion secondary battery. The embedded terminal includes a conductive adhesive layer for sealing, and a metal foil for sealing,
The metal foil for sealing is affixed through the conductive adhesive layer for sealing across the inner surface of the second part and the peripheral edge of the opening on the inner surface of the laminate film. The inner end of the opening is sealed,
The all-solid-state of Claim 5 with which the said 2nd part is electrically connected with respect to the said positive electrode terminal or the said negative electrode terminal via the said electroconductive adhesive layer for sealing, and the said metal foil for sealing. Type lithium ion secondary battery. The buried terminal includes a constraining conductive adhesive layer and a constraining metal foil,
When the constraining metal foil is attached to the positive electrode terminal or the negative electrode terminal via the constraining conductive adhesive layer, the positive electrode terminal or the negative electrode terminal is constrained by the constraining metal foil. The all-solid-state lithium ion secondary battery according to claim 6 . The all-solid-state lithium ion secondary battery according to any one of claims 1 to 7 , wherein the thickness of the maximum thickness portion in the all-solid-state lithium ion secondary battery is 1.0 mm or less.

Images