WO2018096818A1

WO2018096818A1 - Lithium-ion rechargeable battery, and method for producing lithium-ion rechargeable battery

Info

Publication number: WO2018096818A1
Application number: PCT/JP2017/036837
Authority: WO
Inventors: 坂脇　彰; 安田　剛規; 広治南谷
Original assignee: 昭和電工株式会社; 昭和電工パッケージング株式会社
Priority date: 2016-11-25
Filing date: 2017-10-11
Publication date: 2018-05-31

Abstract

This lithium-ion rechargeable battery 1 comprises a battery part 10 which performs charging and discharging using lithium ions, and a shell 30 for housing the battery part 10 in the interior thereof. The shell 30 is constituted by thermo-adhering a first laminated film 31 which includes a first metal layer 313 and a first thermo-adhesive resin layer 315, a second laminated film 32 which includes a second metal layer 323 and a second thermo-adhesive resin layer 325, by thermo-adhering the first thermo-adhesive resin layer 315 and the second thermo-adhesive layer 325. Moreover, the positive electrode side of the battery part 10 is electrically connected with the first metal layer 313 of the first laminated film 31, and the negative electrode side of the battery part 10 is electrically connected to the second metal layer 323 of the second laminated film 32.

Description

Lithium ion secondary battery and method for producing lithium ion secondary battery

The present invention relates to a lithium ion secondary battery and a method for manufacturing a lithium ion secondary battery.

A battery unit including a positive electrode including a positive electrode active material, a negative electrode including a negative electrode active material, an electrolyte having lithium ion conductivity and interposed between the positive electrode and the negative electrode; 2. Description of the Related Art Lithium ion secondary batteries that include an exterior portion that seals a battery portion from outside air or the like by being housed inside are known.

Here, the exterior portion is required to have a high barrier property against gas, liquid and solid. Patent Document 1 describes that an exterior part is configured by heat-sealing heat-seal films using a laminate exterior material formed by laminating a metal foil layer and a heat-sealable resin layer. Yes.

In addition, organic electrolytes and the like have been conventionally used as the electrolyte constituting the battery part. On the other hand, Patent Document 2 describes that a solid electrolyte made of an inorganic material is used as an electrolyte, and that the negative electrode, the solid electrolyte, and the positive electrode are all formed of a thin film.

Japanese Unexamined Patent Publication No. 2016-129091 JP 2013-73846 A

Here, when a lithium ion secondary battery is configured using a thin-film battery unit and an exterior part that accommodates the battery part, a substrate for stacking the battery part is required separately from the exterior part. It was.
An object of the present invention is to simplify the configuration of a thin-film lithium ion secondary battery including a solid electrolyte.

In the lithium ion secondary battery of the present invention, the first metal layer and the first exposed portion where a part of the first metal layer is exposed are formed on one surface of the first metal layer. A first laminated film comprising a first resin layer laminated on a metal layer, and a first laminated on the first metal layer exposed at the first exposed portion, and occludes and releases lithium ions with a first polarity. An electrode layer, a solid electrolyte layer having an inorganic solid electrolyte exhibiting lithium ion conductivity, stacked on the first electrode layer, and stacked on the solid electrolyte layer, with a second polarity opposite to the first polarity A battery unit including a second electrode layer that occludes and releases lithium ions, a second metal layer, and a second exposed portion where a part of the second metal layer is exposed on one surface of the second metal layer. A second resin layer laminated on the second metal layer so as to be formed, A second laminated film that seals the battery unit between the first laminated film and the second metal layer electrically connected to the second electrode layer at the exposed portion. .
In such a lithium ion secondary battery, the entire periphery of the second laminated film may be located outside or inside the entire periphery of the first laminated film.
The first metal layer constituting the first laminated film may be made of stainless steel, and the second metal layer constituting the second laminated film may be made of aluminum.
Furthermore, the first laminated film is laminated on the first metal layer such that another first exposed portion where a part of the first metal layer is exposed is formed on the other surface of the first metal layer. The second laminated film is formed on the other surface of the second metal layer so that another second exposed portion from which a part of the second metal layer is exposed is formed. The semiconductor device may further include a second insulating layer stacked on the second metal layer.
Furthermore, a plurality of the battery parts may be provided, and the plurality of battery parts may be arranged in a matrix between the first laminated film and the second laminated film.
The second electrode layer provided in the battery part and the second metal layer exposed at the second exposed part of the second laminated film are in direct contact with each other. Can do.
In the method of manufacturing a lithium ion secondary battery according to the present invention, the first metal layer and the first exposed portion where a part of the first metal layer is exposed on one surface of the first metal layer are formed. For the first laminated film including the first resin layer laminated on the first metal layer, lithium ions with the first polarity are formed on the first metal layer exposed in the first exposed portion. Depositing and releasing a first electrode layer; forming a solid electrolyte layer having an inorganic solid electrolyte exhibiting lithium ion conductivity on the first electrode layer; and A step of forming a second electrode layer that occludes and releases lithium ions with a second polarity opposite to the first polarity; a second metal layer; and a second metal layer on one surface of the second metal layer. The second metal layer is stacked so as to form a second exposed portion where a part of the second metal layer is exposed. The first resin layer in a state where the second laminated film provided with the second resin layer is disposed so that the second metal layer exposed to the second exposed portion faces the second electrode layer And a step of fusing the second resin layer.
In such a method of manufacturing a lithium ion secondary battery, the first electrode layer, the solid electrolyte layer, and the second electrode layer may be formed by sputtering, respectively.
Further, in the film formation by the sputtering method, it is possible to repeatedly perform discharge and non-discharge in a short time.

According to the present invention, it is possible to simplify the configuration of a thin film type lithium ion secondary battery including a solid electrolyte.

(A), (b) is a figure for demonstrating the whole structure of the lithium ion secondary battery with which Embodiment 1 is applied. FIG. 2 is a cross-sectional view taken along the line II-II in FIG. (A), (b) is a perspective view of the 1st laminated film seen from the front side and the back side. It is a flowchart for demonstrating the manufacturing method of a lithium ion secondary battery. It is a front view of the lithium ion secondary battery with which Embodiment 2 is applied. FIG. 6 is a sectional view taken along line VI-VI in FIG. 5. It is a figure for demonstrating the modification of Embodiment 1, Comprising: It is II-II sectional drawing of Fig.1 (a). FIG. 6 is a diagram for explaining a modification of the second embodiment, and is a cross-sectional view taken along the line VI-VI in FIG. 5.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Note that the size, thickness, and the like of each part in the drawings referred to in the following description may differ from actual dimensions.

<Embodiment 1>
[Configuration of lithium ion secondary battery]
FIG. 1 is a diagram for explaining the overall configuration of a lithium ion secondary battery 1 to which Embodiment 1 is applied. Here, FIG. 1A is a diagram of the lithium ion secondary battery 1 viewed from the front, and FIG. 1B is a diagram of the lithium ion secondary battery 1 viewed from the back.
FIG. 2 is a cross-sectional view taken along the line II-II in FIG. 1A, that is, a vertical cross section of the lithium ion secondary battery 1. 1A is a diagram when FIG. 2 is viewed from the IA direction, and FIG. 1B is a diagram when FIG. 2 is viewed from the IB direction.

The lithium ion secondary battery 1 of the present embodiment includes a battery unit 10 that performs charging and discharging using lithium ions, and an exterior unit that seals the battery unit 10 from outside air or the like by housing the battery unit 10 therein. 30. The lithium ion secondary battery 1 of the present embodiment has a rectangular parallelepiped shape (actually a card shape) when viewed as a whole.

[Battery configuration]
First, the configuration of the battery unit 10 will be described.
The battery unit 10 includes a positive electrode layer 11, a solid electrolyte layer 12 stacked on the positive electrode layer 11, a negative electrode layer 13 stacked on the solid electrolyte layer 12, and a negative electrode current collector stacked on the negative electrode layer 13. Layer 14. Here, the positive electrode layer 11 located at one end (lower side in FIG. 2) of the battery unit 10 is in contact with a first metal layer 313 provided on a first laminated film 31 described later. On the other hand, the negative electrode current collector layer 14 located at the other end (upper side in FIG. 2) of the battery unit 10 is in contact with a second metal layer 323 provided on the second laminated film 32 described later. Yes.

Next, a more detailed description will be given of each component of the battery unit 10.
(Positive electrode layer)
The positive electrode layer 11 as an example of the first electrode layer is a solid thin film, and is particularly limited as long as it includes a positive electrode active material that occludes and releases lithium ions with positive polarity as an example of the first polarity. For example, an oxide or sulfide containing at least one metal selected from manganese (Mn), cobalt (Co), nickel (Ni), iron (Fe), molybdenum (Mo), and vanadium (V) A material or a material composed of various materials such as phosphorus oxides can be used. In the present embodiment, Li ₂ Mn ₂ O ₄ was used as the positive electrode layer 11.

The thickness of the positive electrode layer 11 can be, for example, 10 nm or more and 40 μm or less. When the thickness of the positive electrode layer 11 is less than 10 nm, the capacity of the obtained battery unit 10 (lithium ion secondary battery 1) becomes too small and becomes impractical. On the other hand, when the thickness of the positive electrode layer 11 exceeds 40 μm, it takes too much time to form the layer, and the productivity is lowered. In the present embodiment, the thickness of the positive electrode layer 11 is 600 nm.

The positive electrode layer 11 may have a crystal structure or an amorphous material having no crystal structure, but the expansion and contraction associated with the insertion and extraction of lithium ions is more isotropic. In terms, it is preferably amorphous.

Furthermore, as a manufacturing method of the positive electrode layer 11, a known film forming method such as various PVD (physical vapor deposition) and various CVD (chemical vapor deposition) may be used, but from the viewpoint of production efficiency, a sputtering method may be used. It is desirable to use (sputtering). In this case, a DC sputtering method or an RF sputtering method may be employed depending on the sputtering target used when forming the positive electrode layer 11. However, when the above Li ₂ Mn ₂ O ₄ is used as the positive electrode layer 11, it is preferable to employ an RF sputtering method.

(Solid electrolyte layer)
The solid electrolyte layer 12 is not particularly limited as long as it is a solid thin film made of an inorganic material and exhibits lithium ion conductivity, and is made of various materials such as oxides, nitrides, and sulfides. The configured one can be used. In the present embodiment, LiPON (Li _x PO _y N _z ) in which a part of oxygen in Li ₃ PO ₄ is replaced with nitrogen is used as the solid electrolyte layer 12.

The thickness of the solid electrolyte layer 12 can be, for example, 10 nm or more and 10 μm or less. When the thickness of the solid electrolyte layer 12 is less than 10 nm, leakage between the positive electrode layer 11 and the negative electrode layer 13 is likely to occur in the obtained lithium ion secondary battery 1. On the other hand, when the thickness of the solid electrolyte layer 12 exceeds 10 μm, the moving distance of lithium ions becomes long and the charge / discharge rate becomes slow. In the present embodiment, the thickness of the solid electrolyte layer 12 is 200 nm.

The solid electrolyte layer 12 may have a crystal structure or an amorphous material having no crystal structure. However, the solid electrolyte layer 12 is amorphous in that the expansion and contraction due to heat becomes more isotropic. Preferably there is.

Furthermore, as a manufacturing method of the solid electrolyte layer 12, a known film forming method such as various PVD (physical vapor deposition) and various CVD (chemical vapor deposition) may be used, but from the viewpoint of production efficiency, sputtering is possible. It is desirable to use the method (sputtering). In this case, since there are many insulators in the sputtering target used when forming the solid electrolyte layer 12, it is preferable to employ the RF sputtering method.

(Negative electrode layer)
The negative electrode layer 13 as an example of the second polarity is particularly limited as long as it is a solid thin film and includes a negative electrode active material that occludes and releases lithium ions with a negative polarity as an example of the second polarity. For example, carbon (C) or silicon (Si) can be used. In the present embodiment, silicon (Si) to which boron (B) is added is used as the negative electrode layer 13.

The thickness of the negative electrode layer 13 can be, for example, 10 nm or more and 40 μm or less. When the thickness of the negative electrode layer 13 is less than 10 nm, the capacity of the obtained battery unit 10 (lithium ion secondary battery 1) becomes too small and becomes impractical. On the other hand, when the thickness of the negative electrode layer 13 exceeds 40 μm, it takes too much time to form the layer, and productivity is lowered. In the present embodiment, the thickness of the negative electrode layer 13 is 100 nm.

Further, the negative electrode layer 13 may have a crystal structure or may be an amorphous material having no crystal structure, but the expansion and contraction associated with insertion and extraction of lithium ions is more isotropic. In terms, it is preferably amorphous.

Furthermore, as a manufacturing method of the negative electrode layer 13, a known film forming method such as various PVD (physical vapor deposition) and various CVD (chemical vapor deposition) may be used, but from the viewpoint of production efficiency, a sputtering method may be used. It is desirable to use (sputtering). In this case, since there are many semiconductors in the sputtering target for forming the negative electrode layer 13, it is preferable to employ the DC sputtering method.

(Negative electrode current collector layer)
The negative electrode current collector layer 14 is not particularly limited as long as it is a solid thin film and has electron conductivity. For example, titanium (Ti), aluminum (Al), copper (Cu), platinum A conductive material containing a metal such as (Pt) or gold (Au) or an alloy thereof can be used. In the present embodiment, titanium (Ti) is used as the negative electrode current collector layer 14.

The thickness of the negative electrode current collector layer 14 can be, for example, 5 nm or more and 50 μm or less. When the thickness of the negative electrode current collector layer 14 is less than 5 nm, the current collecting function is lowered, which is not practical. On the other hand, when the thickness of the negative electrode current collector layer 14 exceeds 50 μm, it takes too much time to form the layer, and productivity is lowered. In the present embodiment, the thickness of the negative electrode current collector layer 14 is 200 nm.

Moreover, as a manufacturing method of the negative electrode collector layer 14, you may use well-known film-forming methods, such as various PVD (physical vapor deposition) and various CVD (chemical vapor deposition), but if it is from a viewpoint of production efficiency. It is desirable to use a sputtering method (sputtering). In this case, since the sputter target for forming the negative electrode current collector layer 14 is metal (Ti), it is preferable to employ a DC sputtering method.

[Configuration of exterior part]
Then, the structure of the exterior part 30 is demonstrated.
The exterior part 30 has a first laminated film 31 and a second laminated film 32. The first laminated film 31 and the second laminated film 32 are arranged to face each other across the battery unit 10, and the first laminated film 31 and the second laminated film 32 are heat-sealed over the entire circumference of the battery unit 10. As a result, the battery unit 10 is sealed. Among these, in the first laminated film 31, each layer (the positive electrode layer 11 to the negative electrode current collector layer 14) constituting the battery unit 10 is laminated on the surface side (the upper side in FIG. 2) which is the inside of the exterior part 30. As a result, the battery unit 10 is integrated. On the other hand, in the second laminated film 32, the negative electrode current collector layer 14 of the battery unit 10 is only in contact with the surface side (lower side in FIG. 2) that is the inside of the exterior unit 30. Therefore, although the battery part 10 is integrated with the second laminated film 32 via the first laminated film 31, the battery part 10 and the first laminated film 31 are in contact with each other and fixed. Although the part 10 and the 2nd laminated | multilayer film 32 contact, they are in the state which is not fixed.

[First laminated film]
First, the first laminated film 31 will be described.
3A and 3B are diagrams for explaining the configuration of the first laminated film 31, wherein FIG. 3A is a perspective view seen from the front side (the upper side in FIG. 2), and FIG. 3B is the rear side (in FIG. 2). The perspective view seen from the lower side is shown respectively. Below, the structure of the 1st laminated | multilayer film 31 is demonstrated, referring FIG. 3 in addition to FIG. 1 and FIG.

The first laminated film 31 includes a first heat-resistant resin layer 311, a first outer adhesive layer 312, a first metal layer 313, a first inner adhesive layer 314, and a first heat-fusible resin layer 315. In this order, they are laminated in the form of a film. That is, the first laminated film 31 includes the first heat-resistant resin layer 311, the first metal layer 313, and the first heat-fusible resin layer 315 via the first outer adhesive layer 312 and the first inner adhesive layer 314. And pasting them together.

Further, the first heat-fusible resin layer 315 and the first inner adhesive layer 314 are not present on the side of the first laminated film 31 where the first heat-fusible resin layer 315 is formed (inside in the exterior part 30). Thus, a first inner exposed portion 316 is provided in which one surface (inner surface) of the first metal layer 313 is partially exposed. Here, the 1st inner side exposed part 316 as an example of a 1st exposed part is provided in the center part side in the surface direction of the 1st laminated | multilayer film 31, The shape is a rectangular shape. A sidewall is formed by the first inner adhesive layer 314 and the first heat-fusible resin layer 315 around the entire periphery of the first inner exposed portion 316.

Furthermore, the first heat-resistant resin layer 311 and the first outer adhesive layer 312 are not present on the surface of the first laminated film 31 where the first heat-resistant resin layer 311 is formed (outside in the exterior portion 30). A first outer exposed portion 317 that exposes the other surface (outer surface) of the metal layer 313 is provided. Here, the 1st outer side exposure part 317 is provided in the one end part side of the longitudinal direction of the 1st laminated | multilayer film 31, and the shape is a rectangular shape. A sidewall is formed by the first outer adhesive layer 312 and the first heat-resistant resin layer 311 around the entire periphery of the first outer exposed portion 317.

Next, more detailed description will be given for each component of the first laminated film 31.
(First heat resistant resin layer)
The first heat-resistant resin layer 311 as an example of the first insulating layer is the outermost layer in the exterior portion 30, has high resistance to external piercing and wear, and has the first heat-fusible resin layer 315. A heat resistant resin that does not melt at the fusing temperature at the time of heat fusing is used. Here, as the first heat-resistant resin layer 311, it is preferable to use a heat-resistant resin having a melting point higher by 10 ° C. or more than the melting point of the heat-fusible resin constituting the first heat-fusible resin layer 315. It is particularly preferable to use a heat resistant resin having a melting point of 20 ° C. or higher than the melting point of the fusible resin. In the present embodiment, as will be described later, since the first metal layer 313 also serves as the positive electrode of the battery unit 10, the first heat-resistant resin layer 311 has a high electrical resistance value from the viewpoint of safety. Insulating resin is used.

The first heat resistant resin layer 311 is not particularly limited, and examples thereof include a polyamide film and a polyester film, and these stretched films are preferably used. Among them, in terms of moldability and strength, a biaxially stretched polyamide film or a biaxially stretched polyester film, or a multilayer film containing these is particularly preferable, and the biaxially stretched polyamide film and the biaxially stretched polyester film are bonded together. It is preferable to use a multilayer film. The polyamide film is not particularly limited, and examples thereof include 6-polyamide film, 6,6-polyamide film, MXD polyamide film and the like. Examples of the biaxially stretched polyester film include a biaxially stretched polybutylene terephthalate (PBT) film and a biaxially stretched polyethylene terephthalate (PET) film. In the present embodiment, a nylon film (melting point: 220 ° C.) is used as the first heat resistant resin layer 311.

The thickness of the first heat resistant resin layer 311 can be 9 μm or more and 50 μm. If the thickness of the first heat-resistant resin layer 311 is less than 9 μm, it is difficult to ensure sufficient strength as the exterior part 30 of the battery part 10. On the other hand, if the thickness of the first heat-resistant resin layer 311 exceeds 50 μm, the battery becomes thick, which is not preferable, and the manufacturing cost increases. In the present embodiment, the thickness of the first heat resistant resin layer 311 is 25 μm.

(First outer adhesive layer)
The first outer adhesive layer 312 is a layer for bonding the first heat-resistant resin layer 311 and the first metal layer 313. As the first outer adhesive layer 312, for example, an adhesive containing a two-component curable polyester-urethane resin or a polyether-urethane resin with a polyester resin as a main agent and a polyfunctional isocyanate compound as a curing agent is used. It is preferable to use it. In the present embodiment, a two-component curable polyester-urethane adhesive is used as the first outer adhesive layer 312.

(First metal layer)
When the exterior part 30 is configured using the first laminated film 31, the first metal layer 313 prevents entry of oxygen, moisture, and the like from the exterior of the exterior part 30 into the battery part 10 disposed therein. It is a layer that plays the role of (barrier). Further, as will be described later, the first metal layer 313 serves as a substrate when the battery unit 10 is formed using a sputtering method, and a positive current collector that is electrically connected to the positive electrode layer 11 of the battery unit 10. It further plays a role as a body layer (positive internal electrode) and a role as a positive external electrode electrically connected to a load (not shown) provided outside. Therefore, a conductive metal foil is used for the first metal layer 313.

Although it does not specifically limit as the 1st metal layer 313, For example, aluminum foil, copper foil, nickel foil, stainless steel foil, or this clad foil, these annealed foil, or unannealed foil etc. are used preferably. . However, considering that the first metal layer 313 is used as a substrate in the formation of the battery unit 10 by sputtering, it is preferable to use a stainless steel foil having high mechanical strength. Alternatively, a metal foil plated with a conductive metal such as nickel, tin, copper, or chromium may be used. In the present embodiment, a stainless steel foil made of SUS304 is used as the first metal layer 313.

The thickness of the first metal layer 313 can be 20 μm or more and 200 μm or less. If the thickness of the first metal layer 313 is less than 20 μm, pinholes and tears are likely to occur during rolling and heat sealing when manufacturing a metal foil, and the electrical resistance value when used as an electrode increases. End up. On the other hand, if the thickness of the first metal layer 313 exceeds 200 μm, the battery becomes thick, which is not preferable, and the manufacturing cost increases. In the present embodiment, the thickness of the first metal layer 313 is 30 μm.

(First inner adhesive layer)
The first inner adhesive layer 314 is a layer for bonding the first metal layer 313 and the first heat-fusible resin layer 315. As the first inner adhesive layer 314, for example, an adhesive formed by a polyurethane adhesive, an acrylic adhesive, an epoxy adhesive, a polyolefin adhesive, an elastomer adhesive, a fluorine adhesive, or the like is used. Is preferred. Among them, it is preferable to use an acrylic adhesive or a polyolefin adhesive. In this case, the barrier property of the first laminated film 31 against water vapor can be improved. In addition, it is preferable to use an acid-modified adhesive such as polypropylene or polyethylene. In the present embodiment, an acid-modified polypropylene adhesive is used as the first inner adhesive layer 314.

(First heat-fusible resin layer)
The first heat-fusible resin layer 315 as an example of the first resin layer is the innermost layer in the exterior part 30, has high resistance to the material constituting each layer of the battery part 10, and melts at the above-mentioned fusion temperature. A thermoplastic resin that is fused with the second heat-fusible resin layer 325 (details will be described later) of the second laminated film 32 is used. Further, in the present embodiment, as described above, since the first metal layer 313 also serves as the positive electrode of the battery unit 10, from the viewpoint of safety, the electrical resistance value is set as the first heat-fusible resin layer 315. High insulating resin is used.

The first heat-fusible resin layer 315 is not particularly limited. For example, polyethylene, polypropylene, olefin copolymers, acid-modified products thereof, ionomers, and the like are preferably used. Examples of the olefin copolymer include EVA (ethylene / vinyl acetate copolymer), EAA (ethylene / acrylic acid copolymer), and EMAA (ethylene / methacrylic acid copolymer). If the melting point relationship with the first heat-resistant resin layer 311 can be satisfied, a polyamide film (for example, 12 nylon) or a polyimide film can also be used. In the present embodiment, a non-axially stretched polypropylene film (melting point: 165 ° C.) is used as the first heat-fusible resin layer 315.

The thickness of the first heat-fusible resin layer 315 can be 20 μm or more and 80 μm or less. If the thickness of the first heat-fusible resin layer 315 is less than 20 μm, pinholes are likely to occur. On the other hand, when the thickness of the first heat-fusible resin layer 315 exceeds 80 μm, the battery becomes thick, which is not preferable, and the manufacturing cost increases. In the present embodiment, the thickness of the first heat-fusible resin layer 315 is 30 μm.

[Second laminated film]
Subsequently, the second laminated film 32 will be described.
The second laminated film 32 includes a second heat resistant resin layer 321, a second outer adhesive layer 322, a second metal layer 323, a second inner adhesive layer 324, and a second heat-fusible resin layer 325. In this order, they are laminated in the form of a film. That is, the second laminated film 32 includes the second heat-resistant resin layer 321, the second metal layer 323, and the second heat-fusible resin layer 325 via the second outer adhesive layer 322 and the second inner adhesive layer 324. And pasting them together.

In addition, the second heat-fusible resin layer 325 and the second inner adhesive layer 324 are not present on the surface of the second laminated film 32 where the second heat-fusible resin layer 325 is formed (inner side in the exterior portion 30). Thus, a second inner exposed portion 326 is provided in which a part of one surface (inner surface) of the second metal layer 323 is exposed. Here, the 2nd inner side exposed part 326 as an example of a 2nd exposed part is provided in the center part side of the 2nd laminated | multilayer film 32, The shape is a rectangular shape. A sidewall is formed by the second inner adhesive layer 324 and the second heat-fusible resin layer 325 around the entire periphery of the second inner exposed portion 326.

Furthermore, the second heat-resistant resin layer 321 and the second outer adhesive layer 322 are not present on the side of the second laminated film 32 where the second heat-resistant resin layer 321 is formed (outside in the exterior part 30). A second outer exposed portion 327 is provided in which the other surface (outer surface) of the metal layer 323 is partially exposed. Here, the 2nd outer side exposure part 327 is provided in the one end part side of the longitudinal direction of the 2nd laminated film 32, and the shape is a rectangular shape. In addition, a sidewall by the second outer adhesive layer 322 and the second heat resistant resin layer 321 is formed around the entire periphery of the second outer exposed portion 327.

Thus, the structure of the second laminated film 32 including each exposed portion is substantially the same as the structure of the first laminated film 31 shown in FIG.

Next, each component of the second laminated film 32 will be described in more detail.
(Second heat resistant resin layer)
The second heat-resistant resin layer 321 as an example of the second insulating layer is the outermost layer in the exterior portion 30, has high resistance to external piercing and wear, and has the second heat-fusible resin layer 325. A heat resistant resin that does not melt at the fusing temperature at the time of heat fusing is used. In the present embodiment, as will be described later, since the second metal layer 323 also serves as the negative electrode of the battery unit 10, the second heat resistant resin layer 321 has a high electric resistance value from the viewpoint of safety. Insulating resin is used.

And, as the second heat resistant resin layer 321, the material described in the first heat resistant resin layer 311 can be used. At this time, the second heat-resistant resin layer 321 and the first heat-resistant resin layer 311 may be made of the same material or different materials. The thickness of the second heat resistant resin layer 321 may be the same as that of the first heat resistant resin layer 311 or may be different. In the present embodiment, a 25 μm thick nylon film (melting point: 220 ° C.) is used as the second heat resistant resin layer 321.

(Second outer adhesive layer)
The second outer adhesive layer 322 is a layer for bonding the second heat resistant resin layer 321 and the second metal layer 323.
As the second outer adhesive layer 322, the material described in the first outer adhesive layer 312 can be used. At this time, the second outer adhesive layer 322 and the first outer adhesive layer 312 may be made of the same material or different materials. In the present embodiment, a two-component curable polyester-urethane adhesive is used as the second outer adhesive layer 322.

(Second metal layer)
When the exterior part 30 is formed using the second laminated film 32, the second metal layer 323 prevents entry of oxygen, moisture, etc. from the exterior of the exterior part 30 into the battery part 10 disposed therein. It is a layer that plays the role of (barrier). In addition, as described later, the second metal layer 323 serves as a negative internal electrode that is electrically connected to the negative electrode current collector layer 14 of the battery unit 10 and a load (not shown) provided outside. ) And a role as a negative external electrode electrically connected. For this reason, a conductive metal foil is used for the second metal layer 323. Note that, unlike the first metal layer 313, the second metal layer 323 does not serve as a substrate when the battery unit 10 is formed using a sputtering method.

For the second metal layer 323, the materials described in the first metal layer 313 can be used. At this time, the second metal layer 323 and the first metal layer 313 may be made of the same material or different materials. The thickness of the second metal layer 323 may be the same as that of the first metal layer 313 or may be different. In this embodiment, as the second metal layer 323, an aluminum foil having a thickness of 40 μm made of an A8021H—O material defined by JIS H4160 was used.

(Second inner adhesive layer)
The second inner adhesive layer 324 is a layer for bonding the second metal layer 323 and the second heat-fusible resin layer 325.
As the second inner adhesive layer 324, the material described in the first inner adhesive layer 314 can be used. At this time, the second inner adhesive layer 324 and the first inner adhesive layer 314 may be made of the same material or different materials. In the present embodiment, an acid-modified polypropylene adhesive is used as the second inner adhesive layer 324.

(Second heat-fusible resin layer)
The second heat-fusible resin layer 325 as an example of the second resin layer is the innermost layer in the exterior part 30, has high resistance to the material constituting each layer of the battery part 10, and melts at the above-mentioned fusion temperature. A thermoplastic resin that is fused with the first heat-fusible resin layer 315 of the first laminated film 31 is used. In the present embodiment, as described above, since the second metal layer 323 also serves as the negative electrode of the battery unit 10, the electrical resistance value as the second heat-fusible resin layer 325 from the viewpoint of safety. High insulating resin is used.

And as the second heat-fusible resin layer 325, the materials described in the first heat-fusible resin layer 315 can be used. At this time, the second heat-fusible resin layer 325 and the first heat-fusible resin layer 315 may be made of the same material, and if the melting points of the two materials are close and dissolve, You may comprise with a different material. The thickness of the second heat-fusible resin layer 325 may be the same as that of the first heat-fusible resin layer 315 or may be different. In the present embodiment, a non-axially stretched polypropylene film (melting point: 165 ° C.) having a thickness of 30 μm is used as the second heat-fusible resin layer 325.

[Dimensions and positional relationship of the first laminated film and the second laminated film]
As shown in FIG. 1, the 1st laminated film 31 and the 2nd laminated film 32 which comprise the exterior part 30 are exhibiting the rectangular shape, respectively, when it sees from the front or the back. The short side of the first laminated film 31 and the short side of the second laminated film 32 are substantially parallel, and the long side of the first laminated film 31 and the second laminated film 32 and the long side are substantially parallel. Thus, the first laminated film 31 and the second laminated film 32 are heat-sealed in a superposed state.

Here, the length of the first laminated film 31 on the short side is larger than the length of the second laminated film 32 on the short side. Further, the length on the long side of the first laminated film 31 is larger than the length on the long side of the second laminated film 32. And in the exterior part 30, the 1st laminated film 31 and the 2nd laminated film 32 are piled up so that the whole periphery of the 2nd laminated film 32 may be located inside the whole periphery of the 1st laminated film 31. It is heat-sealed in the state.

[Electrical connection structure in lithium ion secondary battery]
Next, an electrical connection structure in the above-described lithium ion secondary battery 1 will be described.
First, in the battery part 10, the positive electrode layer 11, the solid electrolyte layer 12, the negative electrode layer 13, and the negative electrode collector layer 14 are electrically connected in this order.

Further, the positive electrode layer 11 of the battery unit 10 is electrically connected to a portion exposed to the first inner exposed portion 316 in one surface (inner surface) of the first metal layer 313 provided in the first laminated film 31. Connected to. In addition, a part of the other surface (outer surface) of the first metal layer 313 provided in the first laminated film 31 is exposed to the outside at the first outer exposed portion 317, and the load provided outside. (Not shown) can be electrically connected.

On the other hand, the negative electrode current collector layer 14 of the battery unit 10 is exposed to the second inner exposed portion 326 of one surface (inner surface) of the second metal layer 323 provided on the second laminated film 32. It is electrically connected to the part that does. In addition, a part of the other surface (outer surface) of the second metal layer 323 provided on the second laminated film 32 is exposed to the outside at the second outer exposed portion 327, and the load provided outside. (Not shown) can be electrically connected.

And the 1st metal layer 313 provided in the 1st lamination film 31 and the 2nd metal layer 323 provided in the 2nd lamination film 32 are the 1st heat fusion nature provided in the 1st lamination film 31. The resin layer 315 and the second heat-fusible resin layer 325 provided on the second laminated film 32 are electrically insulated. At this time, in the exterior part 30, as described above, the first heat fusion of the first laminated film 31 is such that the entire peripheral edge of the second laminated film 32 is located inside the entire peripheral edge of the first laminated film 31. The adhesive resin layer 315 and the second heat-fusible resin layer 325 of the second laminated film 32 are fused. Thereby, the short circuit of the battery part 10 resulting from the contact of the first metal layer 313 and the second metal layer 323 exposed on the side end face of the exterior part 30 is made difficult to occur.

[Method for producing lithium ion secondary battery]
FIG. 4 is a flowchart for explaining a method of manufacturing the lithium ion secondary battery 1 shown in FIG.

(First laminated film exposed portion forming step)
First, a first heat-resistant resin layer 311, a first metal layer 313, and a first heat-fusible resin layer 315 are bonded together via a first outer adhesive layer 312 and a first inner adhesive layer 314. A part of the first heat-fusible resin layer 315 and a part of the first heat-resistant resin layer 311 are removed from the laminated film 31. Thereby, the 1st inner side exposed part 316 and the 1st outer side exposed part 317 are formed in the 1st laminated film 31 (step 10).

(Battery part forming process)
Next, in the first laminated film 31 in which the first inner exposed portion 316 and the first outer exposed portion 317 are formed, the battery portion 10 is formed on the first metal layer 313 exposed to the first inner exposed portion 316 by sputtering. Is formed (step 20). Here, in Step 20, the positive electrode layer 11, the solid electrolyte layer 12, the negative electrode layer 13, and the negative electrode current collector layer 14 are laminated in this order on the first metal layer 313. Details of step 20 will be described later.

(Second laminated film exposed portion forming step)
A second heat-resistant resin layer 321, a second metal layer 323, and a second heat-fusible resin layer 325 are bonded together via a second outer adhesive layer 322 and a second inner adhesive layer 324. A part of the second heat-fusible resin layer 325 and a part of the second heat-resistant resin layer 321 are removed from the laminated film 32. Thereby, the 2nd inner side exposed part 326 and the 2nd outer side exposed part 327 are formed in the 2nd lamination | stacking film 32 (step 30).

(Fusion process)
Then, for example, N in the working box inert gas-filled, such as ₂ gas is introduced to the first laminated film 31 in which the battery unit 10 is formed and a second laminated film 32. In the work box, in the second laminated film 32 and the negative electrode current collector layer 14 of the battery unit 10 formed on the first metal layer 313 exposed to the first inner exposed part 316 in the first laminated film 31. The second metal layer 323 exposed to the second inner exposed portion 326 is opposed. At this time, the first heat-fusible resin layer 315 in the first laminated film 31 and the second heat-fusible resin layer 325 in the second laminated film 32 face each other over the entire outer periphery of the periphery of the battery unit 10. . At this time, the first laminated film 31 and the second laminated film 32 are positioned so that the entire peripheral edge of the second laminated film 32 is located inside the entire peripheral edge of the first laminated film 31.

Thereafter, with the inside of the work box set to a negative pressure, the first heat-fusible resin layer 315 in the first laminated film 31 and the second heat-fusible resin layer 325 in the second laminated film 32 are connected to the battery. The outer periphery of the periphery of the part 10 is fused while being pressurized and heated (step 40). Then, the first heat-fusible resin layer 315 and the second heat-fusible resin layer 325 are heat-fused, so that lithium including the battery part 10 and the exterior part 30 that seals the battery part 10 is obtained. An ion secondary battery 1 is obtained.

At this time, the first metal layer 313 of the first laminated film 31 and the positive electrode layer 11 of the battery unit 10 are joined (integrated) by film formation by a sputtering method. In addition, the second metal layer 323 of the second laminated film 32 and the negative electrode current collector layer 14 of the battery unit 10 are formed of the first heat-fusible resin layer 315 of the first laminated film 31 and the second laminated film 32. The second heat-fusible resin layer 325 is in close contact with the second heat-fusible resin layer 325 by heat fusing with a negative pressure.

[Battery part manufacturing method]
Now, the manufacturing procedure of the battery unit 10 in step 20 will be described with a specific example.
(Formation of positive electrode layer)
First, the 1st laminated film 31 in which the 1st inner side exposed part 316 and the 1st outer side exposed part 317 were formed was installed in the film-forming chamber (chamber) of the sputtering device which is not shown in figure. At this time, the first inner exposed portion 316 of the first laminated film 31 faces the sputtering target, and a portion other than the first inner exposed portion 316 (a portion where the first heat-fusible resin layer 315 exists). Was fitted with a mask. After the first laminated film 31 was installed in the chamber, Ar gas containing 5% O ₂ gas was introduced to adjust the pressure in the chamber to 0.8 Pa. Then, the positive electrode layer 11 was formed (film formation) on the first metal layer 313 by RF sputtering using a sputtering target having a composition of Li ₂ Mn ₂ O ₄ .

The temperature at the time of film formation is limited by the melting point of the material used for the first laminated film 31. For this reason, the temperature of the first laminated film 31 during film formation is preferably 300 ° C. or less, and more preferably 200 ° C. or less. In the present embodiment, the temperature of the substrate, that is, the first metal layer 313 is prevented from exceeding 150 ° C. by repeating discharge in a short time and standby (non-discharge). The film composition of the positive electrode layer 11 thus obtained was Li ₂ Mn ₂ O ₄ , its thickness was 600 nm, and its crystal structure was amorphous.

(Formation of solid electrolyte layer)
Next, N ₂ gas was introduced to adjust the pressure in the chamber to 0.8 Pa. Then, the solid electrolyte layer 12 was formed (film formation) on the positive electrode layer 11 by RF sputtering using a sputtering target having a composition of Li ₃ PO ₄ . At this time, similarly to the formation of the positive electrode layer 11, the temperature of the substrate, that is, the first metal layer 313 was prevented from exceeding 150 ° C. by repeating discharge in a short time and standby (non-discharge). The film composition of the solid electrolyte layer 12 thus obtained was LiPON, its thickness was 200 nm, and its crystal structure was amorphous.

(Formation of negative electrode layer)
Subsequently, Ar gas was introduced to adjust the pressure in the chamber to 0.8 Pa. Then, the negative electrode layer 13 was formed (film formation) on the solid electrolyte layer 12 by DC sputtering using a sputtering target (P-type Si target) made of silicon (Si) doped with boron (B). . At this time, as in the case of the positive electrode layer 11, the temperature of the substrate, that is, the first metal layer 313 was prevented from exceeding 150 ° C. by repeating discharge in a short time and standby (non-discharge). The film composition of the negative electrode layer 13 thus obtained was Si doped with B, its thickness was 100 nm, and its crystal structure was amorphous.

(Formation of negative electrode current collector layer)
Further, the negative electrode current collector layer 14 is formed on the negative electrode layer 13 by DC sputtering using a sputtering target made of titanium (Ti) in a state where Ar gas is introduced and the pressure in the chamber is 0.8 Pa. (Film formation) was performed. At this time, as in the case of the positive electrode layer 11, the temperature of the substrate, that is, the first metal layer 313 was prevented from exceeding 150 ° C. by repeating discharge in a short time and standby (non-discharge). The negative electrode current collector layer 14 thus obtained had a film composition of Ti and a thickness of 200 nm.

The battery part 10 was formed on the first metal layer 313 exposed on the first inner exposed part 316 of the first laminated film 31 by the above procedure. Then, the first laminated film 31 on which the battery unit 10 was formed was taken out from the chamber. Here, in the present embodiment, since each layer constituting the battery unit 10 is formed by sputtering on the first metal layer 313 of the first laminated film 31, the first laminated film 31 and the battery unit 10 are The first metal layer 313 and the positive electrode layer 11 are integrated.

[Summary of Embodiment 1]
As described above, according to the present embodiment, the function of sealing the battery unit 10 on the first metal layer 313 of the first laminated film 31 constituting the exterior unit 30 and the function of the battery unit 10 as the positive electrode. And the second metal layer 323 of the second laminated film 32 constituting the exterior part 30 has a function of sealing the battery part 10 and a function as a negative electrode of the battery part 10, The configuration of the thin-film lithium ion secondary battery 1 including the solid electrolyte layer 12 can be simplified. Here, in this Embodiment, since the 1st laminated | multilayer film 31 and the battery part 10 are integrated, the position shift with the exterior part 30 and the battery part 10 in the lithium ion secondary battery 1 can be suppressed. .

<Embodiment 2>
In the first embodiment, the lithium ion secondary battery 1 is configured by housing a single battery unit 10 in the exterior unit 30. On the other hand, in the present embodiment, a plurality of battery units 10 are accommodated in the exterior unit 30 and the plurality of battery units 10 are connected in parallel using the exterior unit 30, so that lithium ions having a larger capacity can be obtained. The secondary battery 1 is configured. In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

[Configuration of lithium ion secondary battery]
FIG. 5 is a diagram for explaining the overall configuration of the lithium ion secondary battery 1 to which the second embodiment is applied. Here, FIG. 5 is a view of the lithium ion secondary battery 1 as seen from the front.
FIG. 6 is a cross-sectional view taken along the line VI-VI in FIG. 5, that is, a vertical cross section of the lithium ion secondary battery 1. FIG. 5 is a view of FIG. 6 viewed from the V direction.

The lithium ion secondary battery 1 according to the present embodiment includes a plurality (six in this case) of battery units 10 that perform charging and discharging using lithium ions, and a plurality of battery units 10 accommodated therein. And an exterior part 30 that seals the battery part 10 from outside air or the like. The lithium ion secondary battery 1 of the present embodiment also has a rectangular parallelepiped shape (actually a card shape) when viewed as a whole.

As shown in FIG. 5, the six battery units 10 have the long sides of the exterior unit 30 as the long sides of the individual battery units 10, and the short sides of the exterior unit 30 as the short sides of the individual battery units 10. In a matrix, the outer portion 30 is arranged in three rows on the short side and in two rows on the long side.

[Battery configuration]
The configuration of the six battery units 10 is the same as that described in the first embodiment. That is, each battery unit 10 is stacked on the positive electrode layer 11, the solid electrolyte layer 12 stacked on the positive electrode layer 11, the negative electrode layer 13 stacked on the solid electrolyte layer 12, and the negative electrode layer 13. And a negative electrode current collector layer 14.

[Configuration of exterior part]
Then, the structure of the exterior part 30 is demonstrated.
The exterior part 30 has a first laminated film 31 and a second laminated film 32. The first laminated film 31 and the second laminated film 32 are arranged to face each other across the six battery units 10, and the first laminated film 31 and the second laminated film 32 are arranged around the six battery units 10. The battery part 10 is sealed by heat-sealing over the entire circumference. Therefore, the basic configuration of the exterior part 30 is the same as that of the first embodiment.

However, the first heat-fusible resin layer 315 and the first inner adhesive layer 314 are not present on the surface of the first laminated film 31 on which the first heat-fusible resin layer 315 is formed (inner side in the exterior portion 30). Thus, the first inner exposed portion 316 in which one surface (inner surface) of the first metal layer 313 is partially exposed is provided at six locations (3 × 2) corresponding to the six battery portions 10. This is different from the first embodiment. Further, the second heat-fusible resin layer 325 and the second inner adhesive layer 324 are not present on the surface of the second laminated film 32 where the second heat-fusible resin layer 325 is formed (inner side in the exterior portion 30). In the second metal layer 323, one surface (inner surface) is partially exposed, and second inner exposed portions 326 are provided at six locations (3 × 2) corresponding to the six battery portions 10. This is different from the first embodiment.

[Electrical connection structure in lithium ion secondary battery]
In the present embodiment, each of the positive electrode layers 11 of the six battery units 10 has a first inner side of one surface (inner surface) of the first metal layer 313 provided in the first laminated film 31. It is electrically connected to a portion exposed to the exposed portion 316. In addition, a part of the other surface (outer surface) of the first metal layer 313 provided in the first laminated film 31 is exposed to the outside at the first outer exposed portion 317, and an external electrode (positive electrode) , Not shown).

On the other hand, each of the negative electrode current collector layers 14 of the six battery units 10 is the second of the two surfaces (inner surfaces) of the second metal layer 323 provided on the second laminated film 32. It is electrically connected to a portion exposed to the inner exposed portion 326. In addition, a part of the other surface (outer surface) of the second metal layer 323 provided on the second laminated film 32 is exposed to the outside at the second outer exposed portion 327, and an external negative electrode ( It is possible to make an electrical connection.

[Summary of Embodiment 2]
As described above, in the present embodiment, in addition to the effects described in the first embodiment, the plurality of battery units 10 are formed using the first metal layer 313 of the first laminated film 31 and the second laminated film 32. By connecting in parallel using the second metal layer 323, the capacity can be increased.

<Modification of Embodiment 1>
In the lithium ion secondary battery 1 of Embodiment 1, the battery unit 10 has the negative electrode current collector layer 14, but the negative electrode current collector layer 14 is not essential.
FIG. 7 is a view for explaining a modification of the first embodiment and is a cross-sectional view taken along the line II-II in FIG.

In the modification of Embodiment 1, the battery unit 10 is stacked on the positive electrode layer 11 and the positive electrode layer 11 stacked on the first metal layer 313 exposed on the first inner exposed portion 316 of the first laminated film 31. A solid electrolyte layer 12 and a negative electrode layer 13 laminated on the solid electrolyte layer 12 are provided. The negative electrode layer 13 located at the other end (upper side in FIG. 7) of the battery unit 10 is in direct contact with the second metal layer 323 exposed at the second inner exposed portion 326 of the second laminated film 32. is doing.

By adopting such a configuration, the structure of the lithium ion secondary battery 1 can be simplified as compared with the configuration described in the first embodiment.

<Modification of Embodiment 2>
In the lithium ion secondary battery 1 of Embodiment 2, each of the plurality of battery units 10 has the negative electrode current collector layer 14, but in these, the negative electrode current collector layer 14 is not essential.
FIG. 8 is a view for explaining a modification of the second embodiment, and is a cross-sectional view taken along the line VI-VI in FIG.

In the modification of the second embodiment, each battery unit 10 is laminated on the positive electrode layer 11 and the positive electrode layer 11 laminated on the first metal layer 313 exposed on the first inner exposed part 316 of the first laminated film 31. A solid electrolyte layer 12 and a negative electrode layer 13 laminated on the solid electrolyte layer 12. And each negative electrode layer 13 located in the other edge part (upper side in FIG. 8) of each battery part 10 is directly connected to the second metal layer 323 exposed to the second inner exposed part 326 of the second laminated film 32. Touching.

By adopting such a configuration, the structure of the lithium ion secondary battery 1 can be simplified as compared with the configuration described in the second embodiment.

<Others>
In the first and second embodiments, the positive electrode layer 11, the solid electrolyte layer 12, the negative electrode layer 13, and the negative electrode current collector layer 14 are laminated on the first metal layer 313 of the first laminated film 31 in this order. However, the stacking order is not limited to this. For example, the battery unit 10 may be formed by laminating the negative electrode layer 13, the solid electrolyte layer 12, and the positive electrode layer 11 in this order on the first metal layer 313 of the first laminated film 31. In this case, a positive electrode current collector layer in contact with the second metal layer 323 of the second laminated film 32 may be provided on the positive electrode layer 11, but it is not essential.

In the first and second embodiments, the first laminated film 31 constituting the exterior portion 30 includes the first heat-resistant resin layer 311, but at least the first metal layer 313 and the first heat-fusible resin layer. 315, and the first heat-resistant resin layer 311 is not essential. In the first and second embodiments, the second laminated film 32 constituting the exterior portion 30 includes the second heat-resistant resin layer 321, but at least the second metal layer 323 and the second heat-fusible resin layer. 325 and the second heat resistant resin layer 321 is not essential.

Further, in the first and second embodiments, the first laminated film 31 and the second laminated film 32 are arranged so that the entire peripheral edge of the second laminated film 32 is located inside the entire peripheral edge of the first laminated film 31. Although they are superposed, it is not limited to this. That is, the first laminated film 31 and the second laminated film 32 may be overlapped so that the entire peripheral edge of the second laminated film 32 is positioned outside the entire peripheral edge of the first laminated film 31. .

Furthermore, in the first and second embodiments and the modifications thereof, the battery unit 10 (the negative electrode current collector layer 14 or the negative electrode layer 13) and the second laminated film 32 (second metal layer 323) are not fixed. However, the present invention is not limited to this. For example, a conductive adhesive or the like may be used to fix the positional relationship between the two.

DESCRIPTION OF SYMBOLS 1 ... Lithium ion secondary battery, 10 ... Battery part, 11 ... Positive electrode layer, 12 ... Solid electrolyte layer, 13 ... Negative electrode layer, 14 ... Negative electrode collector layer, 30 ... Exterior part, 31 ... 1st laminated film, 32 2nd laminated film, 311 ... 1st heat resistant resin layer, 312 ... 1st outside adhesive layer, 313 ... 1st metal layer, 314 ... 1st inside adhesive layer, 315 ... 1st heat-fusible resin layer, 316 ... first inner exposed portion, 317 ... first outer exposed portion, 321 ... second heat resistant resin layer, 322 ... second outer adhesive layer, 323 ... second metal layer, 324 ... second inner adhesive layer, 325 ... first 2 heat-fusible resin layers, 326... Second inner exposed portion, 327... Second outer exposed portion

Claims

The first metal layer and the first resin layer laminated on the first metal layer such that a first exposed portion where a part of the first metal layer is exposed is formed on one surface of the first metal layer. A first laminated film comprising:
A first electrode layer that is stacked on the first metal layer exposed at the first exposed portion and that absorbs and releases lithium ions with a first polarity, and is stacked on the first electrode layer and exhibits lithium ion conductivity. A battery unit comprising: a solid electrolyte layer having an inorganic solid electrolyte; and a second electrode layer laminated on the solid electrolyte layer and having a second polarity opposite to the first polarity to occlude and release lithium ions;
A second metal layer and a second resin layer laminated on the second metal layer such that a second exposed portion where a part of the second metal layer is exposed is formed on one surface of the second metal layer. And the second exposed metal is sealed between the first laminated film and the second metal layer in a state where the second metal layer is electrically connected to the second electrode layer. A lithium ion secondary battery comprising a laminated film.
2. The lithium ion secondary battery according to claim 1, wherein the entire peripheral edge of the second laminated film is located outside or inside the entire peripheral edge of the first laminated film.
The first metal layer constituting the first laminated film is made of stainless steel, and the second metal layer constituting the second laminated film is made of aluminum. Lithium ion secondary battery.
The first laminated film is laminated on the first metal layer such that another first exposed portion where a part of the first metal layer is exposed is formed on the other surface of the first metal layer. 1 further comprising an insulating layer;
The second laminated film is laminated on the second metal layer such that another second exposed portion where a part of the second metal layer is exposed is formed on the other surface of the second metal layer. The lithium ion secondary battery according to any one of claims 1 to 3, further comprising two insulating layers.
5. The battery unit according to claim 1, wherein the battery unit includes a plurality of battery units, and the plurality of battery units are arranged in a matrix between the first laminated film and the second laminated film. The lithium ion secondary battery as described.
2. The second electrode layer provided in the battery part and the second metal layer exposed at the second exposed part of the second laminated film are in direct contact with each other. The lithium ion secondary battery of any one of thru | or 5.
The first metal layer and the first resin layer laminated on the first metal layer such that a first exposed portion where a part of the first metal layer is exposed is formed on one surface of the first metal layer. Forming a first polar layer that occludes and releases lithium ions with a first polarity on the first metal layer exposed at the first exposed portion, for the first laminated film comprising:
Forming a solid electrolyte layer having an inorganic solid electrolyte exhibiting lithium ion conductivity on the first electrode layer;
Forming a second electrode layer on the solid electrolyte layer that occludes and releases lithium ions with a second polarity opposite to the first polarity;
A second metal layer and a second resin layer laminated on the second metal layer such that a second exposed portion where a part of the second metal layer is exposed is formed on one surface of the second metal layer. The first resin layer and the second resin layer in a state where the second metal film exposed to the second exposed portion is disposed so that the second metal layer is opposed to the second electrode layer. A method of manufacturing a lithium ion secondary battery.
The method for manufacturing a lithium ion secondary battery according to claim 7, wherein the first electrode layer, the solid electrolyte layer, and the second electrode layer are formed by sputtering.
9. The method of manufacturing a lithium ion secondary battery according to claim 8, wherein in the film formation by the sputtering method, discharge and non-discharge are repeatedly performed in a short time.