WO2018155157A1 - Power storage sheet and battery - Google Patents

Power storage sheet and battery Download PDF

Info

Publication number
WO2018155157A1
WO2018155157A1 PCT/JP2018/003923 JP2018003923W WO2018155157A1 WO 2018155157 A1 WO2018155157 A1 WO 2018155157A1 JP 2018003923 W JP2018003923 W JP 2018003923W WO 2018155157 A1 WO2018155157 A1 WO 2018155157A1
Authority
WO
WIPO (PCT)
Prior art keywords
solid
electricity storage
sheet
state
power storage
Prior art date
Application number
PCT/JP2018/003923
Other languages
French (fr)
Japanese (ja)
Inventor
充 吉岡
雅彦 近藤
康次 服部
孝則 中村
Original Assignee
株式会社村田製作所
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社村田製作所 filed Critical 株式会社村田製作所
Publication of WO2018155157A1 publication Critical patent/WO2018155157A1/en

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/528—Fixed electrical connections, i.e. not intended for disconnection
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present invention relates to a power storage sheet and a battery including the same.
  • Patent Document 1 describes a power storage device having flexibility.
  • the power storage device described in Patent Document 1 describes a power storage device including a flexible substrate, a positive electrode lead and a negative electrode lead provided on the substrate, and a plurality of power storage elements mounted on the substrate. Yes.
  • the power storage device described in Patent Document 1 when the substrate is bent, the lead may be peeled off from the power storage element. For this reason, the power storage device described in Patent Document 1 has a problem of low reliability.
  • the main object of the present invention is to provide an electricity storage sheet having excellent reliability.
  • the electricity storage sheet according to the present invention includes a plurality of all solid state electricity storage elements, an insulating sheet, and a flexible connecting member.
  • the plurality of all-solid power storage elements are arranged at intervals. At least a part of the plurality of all solid state power storage elements is embedded in the insulating sheet.
  • the insulating sheet has flexibility.
  • the flexible connecting member is disposed in the insulating sheet. The flexible connecting member electrically connects a plurality of all solid state power storage elements.
  • the electricity storage sheet according to the present invention at least some of the plurality of all solid electricity storage elements are embedded in the insulating sheet, and the flexible connection member is arranged in the insulating sheet. That is, the all-solid-state electricity storage element and the flexible connection member are connected in the insulating sheet. For this reason, for example, even when the electricity storage sheet is flexible, the flexible connecting member is unlikely to peel from the all-solid electricity storage element. Therefore, the electricity storage sheet according to the present invention has excellent reliability.
  • At least one of the ridge line portion and the corner portion of the all solid electricity storage element has a rectangular parallelepiped shape having a chamfered shape or a rounded shape.
  • the length of the longest side of the all-solid electricity storage element is preferably 10 mm or less.
  • the plurality of all solid state power storage elements may include three or more all solid state power storage elements arranged along one direction.
  • one all-solid-state electricity storage element of three or more all-solid-state electricity storage elements is connected to the all-solid-state electricity storage element located on one side in one direction with respect to one all-solid-state electricity storage element.
  • the flexible connection member and the flexible connection member that connects the all-solid-state electricity storage element located on the other side in one direction with respect to one all-solid-state electricity storage element are provided separately. Is preferred.
  • the battery according to the present invention includes the electricity storage sheet according to the present invention.
  • the battery according to the present invention may further include an exterior body that houses a wound power storage sheet.
  • an electricity storage sheet having excellent reliability can be provided.
  • FIG. 1 is a schematic plan view of the electricity storage sheet according to the first embodiment.
  • FIG. 2 is a schematic plan view of the electricity storage sheet according to the first embodiment.
  • 3 is a schematic cross-sectional view taken along line III-III in FIG.
  • FIG. 4 is a schematic perspective view of the all-solid-state electricity storage element in the first embodiment.
  • FIG. 5 is a schematic cross-sectional view taken along line VV in FIG.
  • FIG. 6 is a schematic perspective view of the battery according to the first embodiment.
  • FIG. 7 is a schematic exploded perspective view of the battery according to the first embodiment.
  • FIG. 8 is a schematic plan view of the electricity storage sheet according to the second embodiment.
  • FIG. 9 is a schematic cross-sectional view taken along line IX-IX in FIG. FIG.
  • FIG. 10 is a schematic plan view of the electricity storage sheet according to the third embodiment.
  • FIG. 11 is a schematic plan view of a power storage sheet according to the fourth embodiment.
  • FIG. 12 is a schematic side view of the all-solid-state electricity storage element in the fifth and sixth embodiments.
  • FIG. 13 is a schematic cross-sectional view of a power storage sheet according to the fifth embodiment.
  • FIG. 14 is a schematic cross-sectional view of a power storage sheet according to the sixth embodiment.
  • FIG. 1 is a schematic plan view of the electricity storage sheet according to the first embodiment.
  • FIG. 2 is a schematic plan view of the electricity storage sheet according to the first embodiment.
  • 3 is a schematic cross-sectional view taken along line III-III in FIG.
  • the drawing of the first flexible connection member 31 is omitted.
  • the drawing of the second flexible connection member 32 is omitted.
  • the electricity storage sheet 1 includes a plurality of all solid electricity storage elements 10, an insulating sheet 20, and a flexible connection member 30.
  • the plurality of all solid state power storage elements 10 are arranged at intervals.
  • the plurality of all solid state power storage elements 10 are arranged in a matrix along one direction (x-axis direction) and another direction (y-axis direction) different from the one direction. They are spaced apart from each other.
  • x-axis direction x-axis direction
  • y-axis direction another direction
  • the arrangement of the plurality of all solid state power storage elements 10 is not particularly limited.
  • the plurality of all solid state power storage elements may be arranged in a matrix along one direction and another direction inclined with respect to the one direction.
  • the plurality of all-solid-state power storage elements may be arranged linearly along one direction.
  • a plurality of all-solid-state electricity storage elements included in the electricity-storage sheet may include all-solid-state electricity storage elements having shapes different from those of other all-solid-state electricity storage elements, or all-solid-state electricity storage elements having different sizes. Good. Further, for example, the plurality of all-solid power storage elements may have different shapes or different sizes.
  • the all-solid-state electricity storage element 10 has a rectangular parallelepiped shape. Specifically, in the present embodiment, the all-solid-state electricity storage element 10 has a rectangular parallelepiped shape in which the dimension in the length direction L is longer than the dimension in the width direction W.
  • the “cuboid” includes a rectangular parallelepiped shape in which at least one of the ridge line portion and the corner portion is chamfered or rounded, and a shape in which at least one of the ridge line portion and the corner portion is chamfered or rounded. It is assumed that a rectangular parallelepiped shape is included.
  • the ridge line portion and the corner portion of the all-solid-state electricity storage element 10 have a rounded shape.
  • the dimensions of the all-solid-state electricity storage element 10 are not particularly limited, but the length of the longest side is preferably 10 mm or less, more preferably 1 mm or less, and even more preferably 0.6 mm or less.
  • the all-solid power storage element 10 is not particularly limited as long as it is a power storage element in which all the constituent elements are solid.
  • the all-solid-state electricity storage element 10 includes a solid electrolyte layer 11 made of a solid electrolyte layer, a first electrode 12, and a second electrode 13.
  • the first electrode 12 is disposed on one main surface (first main surface) of the solid electrolyte layer 11, while the second electrode 13 is disposed on the other main surface (second surface) of the solid electrolyte layer 11. It is arranged on the main surface.
  • the solid electrolyte layer 11 is sandwiched between the first electrode 12 and the second electrode 13 facing each other.
  • One of the first and second electrodes 12 and 13 constitutes a positive electrode, and the other constitutes a negative electrode.
  • the first electrode 12 constitutes a negative electrode
  • the second electrode 13 constitutes a positive electrode
  • the first electrode 12 has a negative electrode current collector and a negative electrode active material layer.
  • the negative electrode current collector can be made of, for example, Pt, Au, Ag, Al, Cu, stainless steel, ITO (indium tin oxide), or the like.
  • the negative electrode active material layer is provided on the negative electrode current collector.
  • the negative electrode active material layer is composed of a sintered body including negative electrode active material particles, solid electrolyte particles, and conductive particles.
  • MO X Mo is at least one selected from the group consisting of Ti, Si, Sn, Cr, Fe, Nb, and Mo. 0.9 ⁇ x ⁇ 3.0
  • graphite-lithium compound lithium alloy, lithium-containing phosphate compound having NASICON type structure, lithium-containing phosphate compound having olivine type structure, lithium-containing oxide having spinel type structure Etc.
  • a portion of the oxygen of the compound represented by MO X may be substituted with P or Si.
  • Li Y MO X (M is at least one selected from the group consisting of Ti, Si, Sn, Cr, Fe, Nb, V, and Mo. 0.9 ⁇ X ⁇ 3.0, 2.0 A compound represented by ⁇ Y ⁇ 4.0) can also be suitably used.
  • Specific examples of lithium alloys preferably used include Li—Al.
  • Specific examples of the lithium-containing phosphoric acid compound having a NASICON structure that is preferably used include Li 3 V 2 (PO 4 ) 3 and the like.
  • Specific examples of the lithium-containing phosphate compound having an olivine structure that is preferably used include LiCu (PO 4 ) and the like.
  • Specific examples of lithium-containing oxides having a spinel structure that are preferably used include Li 4 Ti 5 O 12 . Only one kind of these negative electrode active materials may be used, or a plurality of kinds may be mixed and used.
  • What is preferably used as the conductive particles contained in the negative electrode active material layer is composed of, for example, a metal such as Ag, Au, Pt, or Pd, carbon, a compound having electronic conductivity, or a mixture thereof. be able to. These conductive materials may be included in a state where the surfaces of the negative electrode active material particles and the like are coated.
  • the solid electrolyte preferably used include a lithium-containing phosphate compound having a NASICON structure, an oxide solid electrolyte having a perovskite structure, and an oxide solid electrolyte having a garnet-type or garnet-like structure.
  • a lithium-containing phosphate compound having preferably NASICON structure used Li x M y (PO 4 ) 3 (0.9 ⁇ x ⁇ 1.9,1.9 ⁇ y ⁇ 2.1, M is, Ti, And at least one selected from the group consisting of Ge, Al, Ga and Zr).
  • lithium-containing phosphoric acid compounds having a NASICON structure that are preferably used include, for example, Li 1.4 Al 0.4 Ti 1.6 (PO 4 ) 3 , Li 1.2 Al 0.2 Ti 1.8 (PO 4 ) 3 and the like.
  • oxide solid electrolyte having a perovskite structure preferably used include La 0.55 Li 0.35 TiO 3 and the like.
  • oxide solid electrolyte having a garnet-type or garnet-type similar structure preferably used include Li 7 La 3 Zr 2 O 12 . Only one of these solid electrolytes may be used, or a plurality of types may be mixed and used.
  • the first electrode may be composed of a negative electrode active material layer.
  • the first electrode may be made of metallic lithium.
  • the second electrode 13 is opposed to the first electrode 12 through the solid electrolyte layer 11.
  • the second electrode 13 has a positive electrode current collector and a positive electrode active material layer.
  • the positive electrode active material layer is provided on the positive electrode current collector.
  • the second electrode 13 is arranged so that the positive electrode active material layer faces the negative electrode active material layer.
  • the positive electrode current collector can be made of, for example, Pt, Au, Ag, Al, Cu, stainless steel, ITO (indium tin oxide), or the like.
  • the positive electrode active material layer is composed of a sintered body including positive electrode active material particles, solid electrolyte particles, and conductive particles.
  • the positive electrode active material preferably used include, for example, a lithium-containing phosphate compound having a NASICON structure, a lithium-containing phosphate compound having an olivine structure, a lithium-containing layered oxide, and a lithium-containing oxide having a spinel structure. Thing etc. are mentioned.
  • Specific examples of the lithium-containing phosphoric acid compound having a NASICON structure that is preferably used include Li 3 V 2 (PO 4 ) 3 and the like.
  • lithium-containing phosphate compound having an olivine structure that is preferably used include LiFePO 4 , LiMnPO 4 , LiCoPO 4, and the like.
  • lithium-containing layered oxide preferably used include LiCoO 2 and LiCo 1/3 Ni 1/3 Mn 1/3 O 2 .
  • Specific examples of the lithium-containing oxide having a spinel structure preferably used include LiMn 2 O 4 , LiNi 0.5 Mn 1.5 O 4 , Li 4 Ti 5 O 12 and the like. Only one kind of these positive electrode active materials may be used, or a plurality of kinds may be mixed and used.
  • What is preferably used as the conductive particles contained in the positive electrode active material layer is composed of, for example, a metal such as Ag, Au, Pt, and Pd, carbon, a compound having electron conductivity, or a mixture thereof. be able to. These conductive materials may be included in a state where the surfaces of the positive electrode active material particles and the like are coated.
  • Examples of those preferably used as the solid electrolyte contained in the positive electrode active material layer include those similar to those preferably used as the solid electrolyte contained in the negative electrode active material layer.
  • the second electrode may be composed of a positive electrode active material layer.
  • the solid electrolyte layer 11 is disposed between the first electrode 12 and the second electrode 13.
  • each of the first and second electrodes 12 and 13 is directly joined to the solid electrolyte layer 11.
  • the first electrode 12, the solid electrolyte layer 11, and the second electrode 13 are integrally sintered.
  • the all-solid-state electricity storage element 10 is an integrally sintered body of the first electrode 12, the solid electrolyte layer 11, and the second electrode 13.
  • the solid electrolyte layer 11 is composed of a sintered body of solid electrolyte particles.
  • the solid electrolyte preferably used include a lithium-containing phosphate compound having a NASICON structure, an oxide solid electrolyte having a perovskite structure, and an oxide solid electrolyte having a garnet-type or garnet-like structure.
  • the lithium-containing phosphate compound having preferably NASICON structure Li x M y (PO 4) 3 (0.9 ⁇ x ⁇ 1.9,1.9 ⁇ y ⁇ 2.1, M is, Ti, Ge , Al, Ga, and Zr).
  • lithium-containing phosphate compound having a NASICON structure that is preferably used include, for example, Li 1.4 Al 0.4 Ge 1.6 (PO 4 ) 3 , Li 1.2 Al 0.2 Ti 1.8 (PO 4 ) 3 and the like.
  • oxide solid electrolyte having a perovskite structure preferably used include La 0.55 Li 0.35 TiO 3 and the like.
  • oxide solid electrolyte having a garnet-type or garnet-type similar structure preferably used include Li 7 La 3 Zr 2 O 12 . Only one of these solid electrolytes may be used, or a plurality of types may be mixed and used.
  • At least a part of the plurality of all-solid-state electricity storage elements 10 is embedded in an insulating sheet 20 having flexibility.
  • the entirety of the plurality of all solid state power storage elements 10 is embedded in the insulating sheet 20.
  • the insulating sheet 20 is not particularly limited as long as it is a flexible and insulating sheet.
  • the insulating sheet 20 can be made of, for example, a resin, an elastomer, or the like. From the viewpoint of realizing flexibility, a sheet made of a high molecular weight elastomer that is a rubber-like elastic body at room temperature is more preferable.
  • a thermosetting elastomer such as rubber, a rubber-like elastic body, a thermoplastic elastomer, etc. Can be configured.
  • the rubber includes natural rubber and synthetic rubber, but synthetic rubber with stable quality is more preferably used.
  • Synthetic rubbers include silicone rubber, acrylic rubber, isoprene rubber, urethane rubber, ethylene / vinyl acetate rubber, ethylene propylene diene rubber, styrene / butadiene rubber, nitrile butadiene rubber, butadiene rubber, butyl rubber, fluorine rubber and viton.
  • Thermoplastic elastomers include styrene, styrene / butadiene, styrene / isoprene, olefin, polybutadiene, alkene, vinyl chloride, urethane, and amide materials. There is no limitation to these, and two or more of these may be used in combination.
  • each of the plurality of all-solid-state electricity storage elements 10 includes a first electrode 12 on one side and a second side on the other side in the thickness direction (z-axis direction) of the insulating sheet 20. It arrange
  • the plurality of all-solid-state electricity storage elements 10 are connected by a flexible connecting member 30.
  • the flexible connection member 30 includes a first flexible connection member 31 (see FIG. 1) connecting the first electrodes 12 of the plurality of all-solid-state electricity storage elements 10 and a second electrode. 13 and a second flexible connecting member 32 (see FIG. 2).
  • the first and second flexible connection members 31 and 32 electrically connect a plurality of all-solid-state power storage elements 10 arranged along the x-axis direction in parallel. ing.
  • the first and second flexible connection members 31 and 32 are connected in parallel, and a plurality of rows of the all-solid-state power storage elements 10 arranged along the x-axis direction are provided.
  • a plurality of rows of all solid state power storage elements 10 connected in parallel are connected in parallel by first and second flexible connection members 31 and 32.
  • the first and second flexible connecting members 31 and 32 are not particularly limited as long as they are members having flexibility and conductivity.
  • the 1st and 2nd flexible connection members 31 and 32 can be comprised with the material which has the electroconductivity which consists of metals etc., for example.
  • the first and second flexible connecting members 31 and 32 may be, for example, a wire shape or a belt shape.
  • the electricity storage sheet 1 At least a part of the plurality of all solid state electricity storage elements 10 is embedded in the insulating sheet 20, and the flexible connection member 30 electrically connecting the plurality of all solid state electricity storage elements 10 is insulated.
  • the sheet 20 is disposed in the adhesive sheet 20. That is, the all-solid-state electricity storage element 10 and the flexible connection member 30 are connected in the insulating sheet 20. For this reason, for example, even when the electricity storage sheet 1 is flexible, the flexible connection member 30 is unlikely to peel from the all-solid electricity storage element 10. Therefore, the electricity storage sheet 1 has excellent reliability despite having flexibility.
  • At least one of the ridge line portion and the corner portion of the all solid electricity storage element 10 has a rectangular parallelepiped shape having a chamfered shape or a rounded shape. It is more preferable that both of the ridge line part and the corner part of the slab have a rectangular parallelepiped shape having a chamfered shape or a rounded shape.
  • the length of the longest side of the all-solid-state electricity storage element 10 is preferably 10 mm or less, more preferably 1 mm or less, and further preferably 0.6 mm or less. However, if the all-solid-state electricity storage element 10 is too small, the capacity and energy density of the electricity storage sheet 1 may be too low. Accordingly, the length of the longest side of the all-solid-state electricity storage element 10 is preferably 0.1 mm or more, and more preferably 0.4 mm or more.
  • the capacity of the electricity storage sheet 1 can be freely changed by changing the number of all solid electricity storage elements 10 to be arranged or changing the capacity of the all solid electricity storage elements 10.
  • the electricity storage sheet 1 may have, for example, a polygonal shape other than a rectangular shape, a circular shape, an elliptical shape, an oval shape, or the like.
  • the battery 2 includes an exterior body 3.
  • a power storage sheet 1 is accommodated in the exterior body 3.
  • the electricity storage sheet 1 may be accommodated in the exterior body 3 in any form. Since the electricity storage sheet 1 has flexibility, it can be accommodated in the exterior body 3 as a wound body, for example, or it can be accommodated in the exterior body 3 in a folded state, for example. You can also. Further, a laminate of a plurality of power storage sheets 1 may be accommodated in the exterior body 3.
  • the exterior body 3 includes a positive electrode terminal 3 a connected to the second flexible connection member 32 and a negative electrode terminal 3 b connected to the first flexible connection member 31.
  • the exterior body 3 is filled with resin.
  • the exterior body 3 and the electricity storage sheet 1 are fixed by this resin. For this reason, for example, even if an impact or vibration is applied to the battery 2, the all-solid power storage element 10 is prevented from being damaged due to collision between the all-solid power storage elements 10 included in the power storage sheet 1.
  • the electricity storage sheet 1 has excellent reliability. For this reason, the battery 2 is also less likely to have a reduced capacity even when an impact or vibration is applied, and has excellent reliability.
  • the exterior body 3 has a cylindrical shape with both ends closed has been described.
  • the exterior body 3 is not limited to this shape.
  • the exterior body 3 may have a rectangular parallelepiped shape.
  • the battery according to the present invention may be a cylindrical battery, a button-type battery, a rectangular parallelepiped battery, or the like.
  • the battery according to the present invention may be constituted by, for example, a power storage sheet that is not housed in the exterior body.
  • the electricity storage sheet may be housed in a flexible exterior body. In these cases, a flexible battery can be realized.
  • the battery according to the present invention may be a primary battery or a secondary battery.
  • FIG. 8 is a schematic plan view of a power storage sheet 1a according to the second embodiment.
  • FIG. 9 is a schematic cross-sectional view taken along line IX-IX in FIG.
  • FIG. 10 is a schematic cross-sectional view of a power storage sheet 1b according to the second embodiment.
  • FIG. 11 is a schematic cross-sectional view of a power storage sheet 1c according to the second embodiment.
  • FIG. 9 is also a schematic cross-sectional view taken along line IX-IX in FIG.
  • the plurality of all solid electricity storage elements arranged along the x-axis direction are first on one side in the thickness direction (z-axis direction) of the electricity storage sheet 1a.
  • the all-solid-state electricity storage elements 10 arranged so as to be located are arranged so as to be alternately located along the x-axis direction.
  • a plurality of all-solid-state electricity storage elements 10 arranged along the x-axis direction are electrically connected in series by a flexible connection member 30.
  • a plurality of all-solid-state electricity storage element rows each including a plurality of all-solid-state electricity storage elements 10 connected in series are provided.
  • the plurality of all solid state power storage element rows are electrically connected in parallel by the flexible connection member 30.
  • one all solid electricity storage element 10 is connected to the all solid electricity storage element 10 located on one side in the x-axis direction with respect to the one all solid electricity storage element 10.
  • a connecting member and a flexible connecting member that connects the all solid state electricity storage element 10 located on the other side in the x-axis direction to the one all solid state electricity storage element 10 are provided separately. Yes. For this reason, the electricity storage sheet 1a is more flexible than the electricity storage sheet 1 in the x-axis direction.
  • all the all-solid-state electricity storage elements 10 may be electrically connected in parallel by the flexible connection member 30 as in the electricity storage sheet 1b shown in FIG. Moreover, all the all-solid-state electrical storage elements contained in the electrical storage sheet may be connected in series by the flexible connection member.
  • all the all-solid-state electricity storage elements included in the electricity storage sheet 1c may not be electrically connected.
  • a plurality of all solid state electricity storage element groups including a plurality of all solid state electricity storage elements 10 electrically connected by the flexible connecting member 30 may be provided.
  • FIG. 12 is a schematic side view of the all-solid-state electricity storage element 10a in the fifth and sixth embodiments.
  • FIG. 13 is a schematic cross-sectional view of a power storage sheet 1d according to the fifth embodiment.
  • FIG. 14 is a schematic cross-sectional view of an electricity storage sheet 1e according to the sixth embodiment.
  • the first electrode 12 and the second electrode 13 are provided on the same main surface of the solid electrolyte layer 11.
  • at least a pair of first and second internal electrodes (not shown) facing each other are provided in the solid electrolyte layer 11.
  • the first internal electrode is connected to the first electrode 12.
  • the second internal electrode is connected to the second electrode 13.
  • the first and second electrodes 12 and 13 are on one side of the solid electrolyte layer 11 in the thickness direction (z-axis direction) of the electricity storage sheets 1 d and 1 e.
  • a plurality of all-solid-state electricity storage elements 10a are arranged so as to be located on the (z1 side). For this reason, the flexible connection member 30 is located on the z1 side of the all-solid-state electricity storage element 10a.
  • the z1 side portion of the all-solid electricity storage element 10a and the flexible connecting member 30 are located in the insulating sheet 20, and the surface on the z2 side of the all-solid electricity storage element 10a is separated from the insulation sheet 20. Exposed.
  • the z1 side portion of the all-solid electricity storage element 10a and the flexible connecting member 30 are located in the insulating sheet 20, and the z2 side portion of the all-solid electricity storage element 10a is separated from the insulating sheet 20. Exposed.
  • the electricity storage sheets 1d and 1e since the connection portion between the all-solid electricity storage element 10 and the flexible connection member 30 is located in the insulating sheet 20, even when the electricity storage sheets 1d and 1e are flexible, The all-solid-state electricity storage element 10 and the flexible connection member 30 are difficult to peel off. Therefore, the electricity storage sheets 1d and 1e from which a part of the all-solid electricity storage element 10 is exposed also have excellent reliability.

Abstract

Provided is a power storage sheet having excellent reliability. This power storage sheet 1 comprises: a plurality of all-solid-state power storage elements 10; an insulating sheet 20; and a flexible connection member 30. The plurality of all-solid-state power storage elements 10 are arranged with spacings therebetween. At least a portion of the plurality of all-solid-state power storage elements 10 is embedded in the insulating sheet 20. The insulating sheet 20 is flexible. The flexible connection member 30 is arranged within the insulating sheet 20. The flexible connection member 30 electrically connects the plurality of all-solid-state power storage elements 10.

Description

蓄電シート及び電池Electric storage sheet and battery
　本発明は、蓄電シート及びそれを備える電池に関する。 The present invention relates to a power storage sheet and a battery including the same.
　例えば、特許文献１には、可撓性を有する蓄電装置が記載されている。特許文献１に記載の蓄電装置は、可撓性を有する基板と、基板上に設けられた正極リード及び負極リードと、基板上に実装された複数の蓄電素子とを有する蓄電装置が記載されている。 For example, Patent Document 1 describes a power storage device having flexibility. The power storage device described in Patent Document 1 describes a power storage device including a flexible substrate, a positive electrode lead and a negative electrode lead provided on the substrate, and a plurality of power storage elements mounted on the substrate. Yes.
特開２０１３－２３９４３５号公報JP 2013-239435 A
　特許文献１に記載の蓄電装置では、基板が曲がった際に蓄電素子からリードが剥離したりする場合がある。このため、特許文献１に記載の蓄電装置には、信頼性が低いという問題がある。 In the power storage device described in Patent Document 1, when the substrate is bent, the lead may be peeled off from the power storage element. For this reason, the power storage device described in Patent Document 1 has a problem of low reliability.
　本発明の主な目的は、優れた信頼性を有する蓄電シートを提供することにある。 The main object of the present invention is to provide an electricity storage sheet having excellent reliability.
　本発明に係る蓄電シートは、複数の全固体蓄電エレメントと、絶縁性シートと、可撓性接続部材とを備えている。複数の全固体蓄電エレメントは、相互に間隔をおいて配されている。絶縁性シートには、複数の全固体蓄電エレメントの少なくとも一部が埋め込まれている。絶縁性シートは、可撓性を有する。可撓性接続部材は、絶縁性シート内に配されている。可撓性接続部材は、複数の全固体蓄電エレメントを電気的に接続している。 The electricity storage sheet according to the present invention includes a plurality of all solid state electricity storage elements, an insulating sheet, and a flexible connecting member. The plurality of all-solid power storage elements are arranged at intervals. At least a part of the plurality of all solid state power storage elements is embedded in the insulating sheet. The insulating sheet has flexibility. The flexible connecting member is disposed in the insulating sheet. The flexible connecting member electrically connects a plurality of all solid state power storage elements.
　本発明に係る蓄電シートでは、複数の全固体蓄電エレメントの少なくとも一部が絶縁性シートに埋め込まれており、可撓性接続部材が絶縁性シート内に配されている。すなわち、全固体蓄電エレメントと可撓性接続部材とが絶縁性シート内において接続されている。このため、例えば、蓄電シートが可撓したときにおいても、可撓性接続部材が全固体蓄電エレメントから剥離しにくい。従って、本発明に係る蓄電シートは、優れた信頼性を有している。 In the electricity storage sheet according to the present invention, at least some of the plurality of all solid electricity storage elements are embedded in the insulating sheet, and the flexible connection member is arranged in the insulating sheet. That is, the all-solid-state electricity storage element and the flexible connection member are connected in the insulating sheet. For this reason, for example, even when the electricity storage sheet is flexible, the flexible connecting member is unlikely to peel from the all-solid electricity storage element. Therefore, the electricity storage sheet according to the present invention has excellent reliability.
　本発明に係る蓄電シートでは、全固体蓄電エレメントの稜線部及び角部の少なくとも一方が面取り状又は丸められた形状を有する直方体状であることが好ましい。 In the electricity storage sheet according to the present invention, it is preferable that at least one of the ridge line portion and the corner portion of the all solid electricity storage element has a rectangular parallelepiped shape having a chamfered shape or a rounded shape.
　本発明に係る蓄電シートでは、全固体蓄電エレメントの最長辺の長さが１０ｍｍ以下であることが好ましい。 In the electricity storage sheet according to the present invention, the length of the longest side of the all-solid electricity storage element is preferably 10 mm or less.
　本発明に係る蓄電シートでは、複数の全固体蓄電エレメントが、複数の全固体蓄電エレメントは、一の方向に沿って配列された３つ以上の全固体蓄電エレメントを含んでいてもよい。その場合、３つ以上の全固体蓄電エレメントのうちの一の全固体蓄電エレメントと、一の全固体蓄電エレメントに対して一の方向の一方側に位置する全固体蓄電エレメントとを接続している可撓性接続部材と、一の全固体蓄電エレメントに対して一の方向の他方側に位置する全固体蓄電エレメントとを接続している可撓性接続部材とが別体に設けられていることが好ましい。 In the power storage sheet according to the present invention, the plurality of all solid state power storage elements may include three or more all solid state power storage elements arranged along one direction. In that case, one all-solid-state electricity storage element of three or more all-solid-state electricity storage elements is connected to the all-solid-state electricity storage element located on one side in one direction with respect to one all-solid-state electricity storage element. The flexible connection member and the flexible connection member that connects the all-solid-state electricity storage element located on the other side in one direction with respect to one all-solid-state electricity storage element are provided separately. Is preferred.
　本発明に係る電池は、本発明に係る蓄電シートを備えている。 The battery according to the present invention includes the electricity storage sheet according to the present invention.
　本発明に係る電池は、巻回された蓄電シートを収容している外装体をさらに備えていてもよい。 The battery according to the present invention may further include an exterior body that houses a wound power storage sheet.
　本発明によれば、優れた信頼性を有する蓄電シートを提供することができる。 According to the present invention, an electricity storage sheet having excellent reliability can be provided.
図１は、第１の実施形態に係る蓄電シートの模式的平面図である。FIG. 1 is a schematic plan view of the electricity storage sheet according to the first embodiment. 図２は、第１の実施形態に係る蓄電シートの模式的平面図である。FIG. 2 is a schematic plan view of the electricity storage sheet according to the first embodiment. 図３は、図１の線ＩＩＩ－ＩＩＩにおける模式的断面図である。3 is a schematic cross-sectional view taken along line III-III in FIG. 図４は、第１の実施形態における全固体蓄電エレメントの模式的斜視図である。FIG. 4 is a schematic perspective view of the all-solid-state electricity storage element in the first embodiment. 図５は、図４の線Ｖ－Ｖにおける模式的断面図である。FIG. 5 is a schematic cross-sectional view taken along line VV in FIG. 図６は、第１の実施形態に係る電池の模式的斜視図である。FIG. 6 is a schematic perspective view of the battery according to the first embodiment. 図７は、第１の実施形態に係る電池の模式的分解斜視図である。FIG. 7 is a schematic exploded perspective view of the battery according to the first embodiment. 図８は、第２の実施形態に係る蓄電シートの模式的平面図である。FIG. 8 is a schematic plan view of the electricity storage sheet according to the second embodiment. 図９は、図８の線ＩＸ－ＩＸにおける模式的断面図である。FIG. 9 is a schematic cross-sectional view taken along line IX-IX in FIG. 図１０は、第３の実施形態に係る蓄電シートの模式的平面図である。FIG. 10 is a schematic plan view of the electricity storage sheet according to the third embodiment. 図１１は、第４の実施形態に係る蓄電シートの模式的平面図である。FIG. 11 is a schematic plan view of a power storage sheet according to the fourth embodiment. 図１２は、第５及び第６の実施形態における全固体蓄電エレメントの模式的側面図である。FIG. 12 is a schematic side view of the all-solid-state electricity storage element in the fifth and sixth embodiments. 図１３は、第５の実施形態に係る蓄電シートの模式的断面図である。FIG. 13 is a schematic cross-sectional view of a power storage sheet according to the fifth embodiment. 図１４は、第６の実施形態に係る蓄電シートの模式的断面図である。FIG. 14 is a schematic cross-sectional view of a power storage sheet according to the sixth embodiment.
　以下、本発明を実施した好ましい形態の一例について説明する。但し、下記の実施形態は、単なる例示である。本発明は、下記の実施形態に何ら限定されない。 Hereinafter, an example of a preferable embodiment in which the present invention is implemented will be described. However, the following embodiment is merely an example. The present invention is not limited to the following embodiments.
　また、実施形態等において参照する各図面において、実質的に同一の機能を有する部材は同一の符号で参照することとする。また、実施形態等において参照する図面は、模式的に記載されたものである。図面に描画された物体の寸法の比率などは、現実の物体の寸法の比率などとは異なる場合がある。図面相互間においても、物体の寸法比率等が異なる場合がある。具体的な物体の寸法比率等は、以下の説明を参酌して判断されるべきである。 In each drawing referred to in the embodiment and the like, members having substantially the same function are referred to by the same reference numerals. The drawings referred to in the embodiments and the like are schematically described. A ratio of dimensions of an object drawn in a drawing may be different from a ratio of dimensions of an actual object. The dimensional ratio of the object may be different between the drawings. The specific dimensional ratio of the object should be determined in consideration of the following description.
　（第１の実施形態）
　図１は、第１の実施形態に係る蓄電シートの模式的平面図である。図２は、第１の実施形態に係る蓄電シートの模式的平面図である。図３は、図１の線ＩＩＩ－ＩＩＩにおける模式的断面図である。なお、図１では、第１の可撓性接続部材３１の描画を省略している。図２では、第２の可撓性接続部材３２の描画を省略している。 (First embodiment)
FIG. 1 is a schematic plan view of the electricity storage sheet according to the first embodiment. FIG. 2 is a schematic plan view of the electricity storage sheet according to the first embodiment. 3 is a schematic cross-sectional view taken along line III-III in FIG. In FIG. 1, the drawing of the first flexible connection member 31 is omitted. In FIG. 2, the drawing of the second flexible connection member 32 is omitted.
　蓄電シート１は、複数の全固体蓄電エレメント１０と、絶縁性シート２０と、可撓性接続部材３０とを備えている。 The electricity storage sheet 1 includes a plurality of all solid electricity storage elements 10, an insulating sheet 20, and a flexible connection member 30.
　図１に示すように、複数の全固体蓄電エレメント１０は、相互に間隔をおいて配されている。本実施形態では、具体的には、複数の全固体蓄電エレメント１０は、一の方向（ｘ軸方向）と、一の方向とは異なる他の方向（ｙ軸方向）とに沿ってマトリクス状に相互に間隔をおいて配されている。なお、本実施形態では、ｘ軸方向とｙ軸方向とが直交している例について説明する。但し、本発明において、複数の全固体蓄電エレメント１０の配列は、特に限定されない。複数の全固体蓄電エレメントは、例えば、一の方向と、一の方向に対して傾斜した他の方向とに沿ってマトリクス状に配されていてもよい。複数の全固体蓄電エレメントは、例えば、一の方向に沿って直線状に配されていてもよい。 As shown in FIG. 1, the plurality of all solid state power storage elements 10 are arranged at intervals. In the present embodiment, specifically, the plurality of all solid state power storage elements 10 are arranged in a matrix along one direction (x-axis direction) and another direction (y-axis direction) different from the one direction. They are spaced apart from each other. In the present embodiment, an example in which the x-axis direction and the y-axis direction are orthogonal to each other will be described. However, in the present invention, the arrangement of the plurality of all solid state power storage elements 10 is not particularly limited. For example, the plurality of all solid state power storage elements may be arranged in a matrix along one direction and another direction inclined with respect to the one direction. For example, the plurality of all-solid-state power storage elements may be arranged linearly along one direction.
　尚、本実施形態では、同一の形状及び同一の大きさの複数の全固体蓄電エレメント１０が配されている例について説明する。但し、本発明はこの構成に限定されない。本発明においては、蓄電シートに含まれる複数の全固体蓄電エレメントに、他の全固体蓄電エレメントとは異なる形状を有する全固体蓄電エレメントや、異なる大きさの全固体蓄電エレメントが含まれていてもよい。また、例えば、複数の全固体蓄電エレメントは、互いに異なる形状であったり、異なる大きさであってもよい。 In the present embodiment, an example in which a plurality of all solid state power storage elements 10 having the same shape and the same size are arranged will be described. However, the present invention is not limited to this configuration. In the present invention, a plurality of all-solid-state electricity storage elements included in the electricity-storage sheet may include all-solid-state electricity storage elements having shapes different from those of other all-solid-state electricity storage elements, or all-solid-state electricity storage elements having different sizes. Good. Further, for example, the plurality of all-solid power storage elements may have different shapes or different sizes.
　図４及び図５に示すように、全固体蓄電エレメント１０は、直方体状である。具体的には、本実施形態では、全固体蓄電エレメント１０は、長さ方向Ｌにおける寸法が、幅方向Ｗにおける寸法よりも長い直方体状である。 As shown in FIGS. 4 and 5, the all-solid-state electricity storage element 10 has a rectangular parallelepiped shape. Specifically, in the present embodiment, the all-solid-state electricity storage element 10 has a rectangular parallelepiped shape in which the dimension in the length direction L is longer than the dimension in the width direction W.
　なお、本発明において、「直方体状」には、稜線部及び角部の少なくとも一方が面取り状又は丸められた形状である直方体状、稜線部及び角部の少なくとも一方が面取り状又は丸められた形状である直方体状が含まれるものとする。 In the present invention, the “cuboid” includes a rectangular parallelepiped shape in which at least one of the ridge line portion and the corner portion is chamfered or rounded, and a shape in which at least one of the ridge line portion and the corner portion is chamfered or rounded. It is assumed that a rectangular parallelepiped shape is included.
　本実施形態では、具体的には、全固体蓄電エレメント１０の稜線部及び角部が丸められた形状を有している。 In the present embodiment, specifically, the ridge line portion and the corner portion of the all-solid-state electricity storage element 10 have a rounded shape.
　全固体蓄電エレメント１０の寸法は、特に限定されないが、最長辺の長さが１０ｍｍ以下であることが好ましく、１ｍｍ以下であることがより好ましく０．６ｍｍ以下であることがさらに好ましい。 The dimensions of the all-solid-state electricity storage element 10 are not particularly limited, but the length of the longest side is preferably 10 mm or less, more preferably 1 mm or less, and even more preferably 0.6 mm or less.
　全固体蓄電エレメント１０は、全ての構成要素が固体である蓄電エレメントであれば特に限定されない。 The all-solid power storage element 10 is not particularly limited as long as it is a power storage element in which all the constituent elements are solid.
　図４に示すように、本実施形態では、全固体蓄電エレメント１０は、固体電解質層からなる固体電解質層１１と、第１の電極１２と、第２の電極１３とを有している。第１の電極１２が固体電解質層１１の一方の主面（第１の主面）の上に配されている一方、第２の電極１３が固体電解質層１１の他方の主面（第２の主面）の上に配されている。換言すれば、固体電解質層１１は、互いに対向している第１の電極１２と第２の電極１３とにより挟持されている。 As shown in FIG. 4, in the present embodiment, the all-solid-state electricity storage element 10 includes a solid electrolyte layer 11 made of a solid electrolyte layer, a first electrode 12, and a second electrode 13. The first electrode 12 is disposed on one main surface (first main surface) of the solid electrolyte layer 11, while the second electrode 13 is disposed on the other main surface (second surface) of the solid electrolyte layer 11. It is arranged on the main surface. In other words, the solid electrolyte layer 11 is sandwiched between the first electrode 12 and the second electrode 13 facing each other.
　なお、第１及び第２の電極１２，１３のうちの一方が正極を構成しており、他方が負極を構成している。以下、本実施形態では、第１の電極１２が負極を構成しており、第２の電極１３が正極を構成している例について説明する。 One of the first and second electrodes 12 and 13 constitutes a positive electrode, and the other constitutes a negative electrode. Hereinafter, in the present embodiment, an example in which the first electrode 12 constitutes a negative electrode and the second electrode 13 constitutes a positive electrode will be described.
　第１の電極１２は、負極集電体と、負極活物質層とを有する。負極集電体は、例えば、Ｐｔ、Ａｕ、Ａｇ、Ａｌ、Ｃｕ、ステンレス、ＩＴＯ（酸化インジウムスズ）等により構成することができる。 The first electrode 12 has a negative electrode current collector and a negative electrode active material layer. The negative electrode current collector can be made of, for example, Pt, Au, Ag, Al, Cu, stainless steel, ITO (indium tin oxide), or the like.
　負極活物質層は、負極集電体の上に設けられている。本実施形態では、負極活物質層は、負極活物質粒子と固体電解質粒子と、導電性粒子とを含む焼結体により構成されている。好ましく用いられる負極活物質の具体例としては、例えば、ＭＯＸ（Ｍは、Ｔｉ，Ｓｉ，Ｓｎ，Ｃｒ，Ｆｅ，Ｎｂ及びＭｏからなる群より選ばれた少なくとも一種である。０．９≦ｘ≦３．０）で表される化合物、黒鉛－リチウム化合物、リチウム合金、ナシコン型構造を有するリチウム含有リン酸化合物、オリビン型構造を有するリチウム含有リン酸化合物、スピネル型構造を有するリチウム含有酸化物等が挙げられる。尚、ＭＯＸで表される化合物の酸素の一部が、ＰやＳｉで置換されていてもよい。また、ＬｉＹＭＯＸ（Ｍは、Ｔｉ，Ｓｉ，Ｓｎ，Ｃｒ，Ｆｅ，Ｎｂ，Ｖ及びＭｏからなる群より選ばれた少なくとも一種である。０．９≦Ｘ≦３．０、２．０≦Ｙ≦４．０）で表される化合物も好適に用いることができる。好ましく用いられるリチウム合金の具体例としては、Ｌｉ－Ａｌ等が挙げられる。好ましく用いられるナシコン型構造を有するリチウム含有リン酸化合物の具体例としては、Ｌｉ３Ｖ２（ＰＯ４）３等が挙げられる。好ましく用いられるオリビン型構造を有するリチウム含有リン酸化合物の具体例としては、ＬｉＣｕ（ＰＯ４）等が挙げられる。好ましく用いられるスピネル型構造を有するリチウム含有酸化物の具体例としては、Ｌｉ４Ｔｉ５Ｏ１２等が挙げられる。これらの負極活物質のうちの１種のみを用いてもよいし、複数種類を混合して用いてもよい。 The negative electrode active material layer is provided on the negative electrode current collector. In the present embodiment, the negative electrode active material layer is composed of a sintered body including negative electrode active material particles, solid electrolyte particles, and conductive particles. As a specific example of the negative electrode active material preferably used, for example, MO X (M is at least one selected from the group consisting of Ti, Si, Sn, Cr, Fe, Nb, and Mo. 0.9 ≦ x ≦ 3.0), graphite-lithium compound, lithium alloy, lithium-containing phosphate compound having NASICON type structure, lithium-containing phosphate compound having olivine type structure, lithium-containing oxide having spinel type structure Etc. A portion of the oxygen of the compound represented by MO X may be substituted with P or Si. Li Y MO X (M is at least one selected from the group consisting of Ti, Si, Sn, Cr, Fe, Nb, V, and Mo. 0.9 ≦ X ≦ 3.0, 2.0 A compound represented by ≦ Y ≦ 4.0) can also be suitably used. Specific examples of lithium alloys preferably used include Li—Al. Specific examples of the lithium-containing phosphoric acid compound having a NASICON structure that is preferably used include Li 3 V 2 (PO 4 ) 3 and the like. Specific examples of the lithium-containing phosphate compound having an olivine structure that is preferably used include LiCu (PO 4 ) and the like. Specific examples of lithium-containing oxides having a spinel structure that are preferably used include Li 4 Ti 5 O 12 . Only one kind of these negative electrode active materials may be used, or a plurality of kinds may be mixed and used.
　負極活物質層に含まれる導電性粒子として好ましく用いられるものとしては、例えば、Ａｇ，Ａｕ，Ｐｔ，Ｐｄなどの金属、炭素、電子伝導性を有する化合物、またはそれらを組み合わせた混合物等により構成することができる。またこれらの導電性を有した物質が負極活物質粒子などの表面に被覆された状態で含まれてもよい。 What is preferably used as the conductive particles contained in the negative electrode active material layer is composed of, for example, a metal such as Ag, Au, Pt, or Pd, carbon, a compound having electronic conductivity, or a mixture thereof. be able to. These conductive materials may be included in a state where the surfaces of the negative electrode active material particles and the like are coated.
　好ましく用いられる固体電解質の具体例としては、例えば、ナシコン構造を有するリチウム含有リン酸化合物、ペロブスカイト構造を有する酸化物固体電解質、ガーネット型若しくはガーネット型類似構造を有する酸化物固体電解質等が挙げられる。好ましく用いられるナシコン構造を有するリチウム含有リン酸化合物としては、ＬｉｘＭｙ（ＰＯ４）３（０．９≦ｘ≦１．９、１．９≦ｙ≦２．１、Ｍは、Ｔｉ，Ｇｅ，Ａｌ，Ｇａ及びＺｒからなる群より選ばれた少なくとも一種）が挙げられる。好ましく用いられるナシコン構造を有するリチウム含有リン酸化合物の具体例としては、例えば、Ｌｉ１．４Ａｌ０．４Ｔｉ１．６（ＰＯ４）３、Ｌｉ１．２Ａｌ０．２Ｔｉ１．８（ＰＯ４）３等が挙げられる。好ましく用いられるペロブスカイト構造を有する酸化物固体電解質の具体例としては、Ｌａ０．５５Ｌｉ０．３５ＴｉＯ３等が挙げられる。好ましく用いられるガーネット型若しくはガーネット型類似構造を有する酸化物固体電解質の具体例としては、Ｌｉ７Ｌａ３Ｚｒ２Ｏ１２等が挙げられる。これらの固体電解質のうちの１種のみを用いてもよいし、複数種類を混合して用いてもよい。 Specific examples of the solid electrolyte preferably used include a lithium-containing phosphate compound having a NASICON structure, an oxide solid electrolyte having a perovskite structure, and an oxide solid electrolyte having a garnet-type or garnet-like structure. As the lithium-containing phosphate compound having preferably NASICON structure used, Li x M y (PO 4 ) 3 (0.9 ≦ x ≦ 1.9,1.9 ≦ y ≦ 2.1, M is, Ti, And at least one selected from the group consisting of Ge, Al, Ga and Zr). Specific examples of lithium-containing phosphoric acid compounds having a NASICON structure that are preferably used include, for example, Li 1.4 Al 0.4 Ti 1.6 (PO 4 ) 3 , Li 1.2 Al 0.2 Ti 1.8 (PO 4 ) 3 and the like. Specific examples of the oxide solid electrolyte having a perovskite structure preferably used include La 0.55 Li 0.35 TiO 3 and the like. Specific examples of the oxide solid electrolyte having a garnet-type or garnet-type similar structure preferably used include Li 7 La 3 Zr 2 O 12 . Only one of these solid electrolytes may be used, or a plurality of types may be mixed and used.
　なお、第１の電極において負極集電体を設ける必要は必ずしもない。例えば、負極活物質層により第１の電極を構成してもよい。例えば、金属リチウムにより第１の電極を構成してもよい。 Note that it is not always necessary to provide the negative electrode current collector in the first electrode. For example, the first electrode may be composed of a negative electrode active material layer. For example, the first electrode may be made of metallic lithium.
　第２の電極１３は、固体電解質層１１を介して、第１の電極１２と対向している。第２の電極１３は、正極集電体と、正極活物質層とを有する。正極活物質層は、正極集電体の上に設けられている。第２の電極１３は、正極活物質層が、負極活物質層と対向するように配されている。正極集電体は、例えば、Ｐｔ、Ａｕ、Ａｇ、Ａｌ、Ｃｕ、ステンレス、ＩＴＯ（酸化インジウムスズ）等により構成することができる。 The second electrode 13 is opposed to the first electrode 12 through the solid electrolyte layer 11. The second electrode 13 has a positive electrode current collector and a positive electrode active material layer. The positive electrode active material layer is provided on the positive electrode current collector. The second electrode 13 is arranged so that the positive electrode active material layer faces the negative electrode active material layer. The positive electrode current collector can be made of, for example, Pt, Au, Ag, Al, Cu, stainless steel, ITO (indium tin oxide), or the like.
　正極活物質層は、正極活物質粒子と、固体電解質粒子と、導電性粒子とを含む焼結体により構成されている。好ましく用いられる正極活物質の具体例としては、例えば、ナシコン型構造を有するリチウム含有リン酸化合物、オリビン型構造を有するリチウム含有リン酸化合物、リチウム含有層状酸化物、スピネル型構造を有するリチウム含有酸化物等が挙げられる。好ましく用いられるナシコン型構造を有するリチウム含有リン酸化合物の具体例としては、Ｌｉ３Ｖ２（ＰＯ４）３等が挙げられる。好ましく用いられるオリビン型構造を有するリチウム含有リン酸化合物の具体例としては、ＬｉＦｅＰＯ４、ＬｉＭｎＰＯ４、ＬｉＣｏＰＯ４等が挙げられる。好ましく用いられるリチウム含有層状酸化物の具体例としては、ＬｉＣｏＯ２，ＬｉＣｏ１／３Ｎｉ１／３Ｍｎ１／３Ｏ２等が挙げられる。好ましく用いられるスピネル型構造を有するリチウム含有酸化物の具体例としては、ＬｉＭｎ２Ｏ４，ＬｉＮｉ０．５Ｍｎ１．５Ｏ４、Ｌｉ４Ｔｉ５Ｏ１２等が挙げられる。これらの正極活物質のうちの１種のみを用いてもよいし、複数種類を混合して用いてもよい。正極活物質層に含まれる導電性粒子として好ましく用いられるものとしては、例えば、Ａｇ，Ａｕ，Ｐｔ，Ｐｄなどの金属、炭素、電子伝導性を有する化合物、またはそれらを組み合わせた混合物等により構成することができる。またこれらの導電性を有した物質が正極活物質粒子などの表面に被覆された状態で含まれてもよい。 The positive electrode active material layer is composed of a sintered body including positive electrode active material particles, solid electrolyte particles, and conductive particles. Specific examples of the positive electrode active material preferably used include, for example, a lithium-containing phosphate compound having a NASICON structure, a lithium-containing phosphate compound having an olivine structure, a lithium-containing layered oxide, and a lithium-containing oxide having a spinel structure. Thing etc. are mentioned. Specific examples of the lithium-containing phosphoric acid compound having a NASICON structure that is preferably used include Li 3 V 2 (PO 4 ) 3 and the like. Specific examples of the lithium-containing phosphate compound having an olivine structure that is preferably used include LiFePO 4 , LiMnPO 4 , LiCoPO 4, and the like. Specific examples of the lithium-containing layered oxide preferably used include LiCoO 2 and LiCo 1/3 Ni 1/3 Mn 1/3 O 2 . Specific examples of the lithium-containing oxide having a spinel structure preferably used include LiMn 2 O 4 , LiNi 0.5 Mn 1.5 O 4 , Li 4 Ti 5 O 12 and the like. Only one kind of these positive electrode active materials may be used, or a plurality of kinds may be mixed and used. What is preferably used as the conductive particles contained in the positive electrode active material layer is composed of, for example, a metal such as Ag, Au, Pt, and Pd, carbon, a compound having electron conductivity, or a mixture thereof. be able to. These conductive materials may be included in a state where the surfaces of the positive electrode active material particles and the like are coated.
　正極活物質層に含まれる固体電解質として好ましく用いられるものとしては、上述の負極活物質層に含まれる固体電解質として好ましく用いられるものと同様のものを例示することができる。 Examples of those preferably used as the solid electrolyte contained in the positive electrode active material layer include those similar to those preferably used as the solid electrolyte contained in the negative electrode active material layer.
　なお、第２の電極において正極集電体を設ける必要は必ずしもない。例えば、正極活物質層により第２の電極を構成してもよい。 Note that it is not always necessary to provide a positive electrode current collector in the second electrode. For example, the second electrode may be composed of a positive electrode active material layer.
　第１の電極１２と第２の電極１３との間には、固体電解質層１１が配されている。本実施形態では、第１及び第２の電極１２，１３のそれぞれは、固体電解質層１１と直接接合されている。詳細には、第１の電極１２、固体電解質層１１及び第２の電極１３は、一体焼結されたものである。換言すれば、全固体蓄電エレメント１０は、第１の電極１２と、固体電解質層１１と、第２の電極１３との一体焼結体である。 The solid electrolyte layer 11 is disposed between the first electrode 12 and the second electrode 13. In the present embodiment, each of the first and second electrodes 12 and 13 is directly joined to the solid electrolyte layer 11. Specifically, the first electrode 12, the solid electrolyte layer 11, and the second electrode 13 are integrally sintered. In other words, the all-solid-state electricity storage element 10 is an integrally sintered body of the first electrode 12, the solid electrolyte layer 11, and the second electrode 13.
　固体電解質層１１は、固体電解質粒子の焼結体により構成されている。好ましく用いられる固体電解質の具体例としては、例えば、ナシコン構造を有するリチウム含有リン酸化合物、ペロブスカイト構造を有する酸化物固体電解質、ガーネット型若しくはガーネット型類似構造を有する酸化物固体電解質等が挙げられる。好ましく用いられるナシコン構造を有するリチウム含有リン酸化合物としてはＬｉｘＭｙ（ＰＯ４）３（０．９≦ｘ≦１．９、１．９≦ｙ≦２．１、Ｍは、Ｔｉ，Ｇｅ，Ａｌ，Ｇａ及びＺｒからなる群より選ばれた少なくとも一種）が挙げられる。好ましく用いられるナシコン構造を有するリチウム含有リン酸化合物の具体例としては、例えば、Ｌｉ１．４Ａｌ０．４Ｇｅ１．６（ＰＯ４）３、Ｌｉ１．２Ａｌ０．２Ｔｉ１．８（ＰＯ４）３等が挙げられる。好ましく用いられるペロブスカイト構造を有する酸化物固体電解質の具体例としては、Ｌａ０．５５Ｌｉ０．３５ＴｉＯ３等が挙げられる。好ましく用いられるガーネット型若しくはガーネット型類似構造を有する酸化物固体電解質の具体例としては、Ｌｉ７Ｌａ３Ｚｒ２Ｏ１２等が挙げられる。これらの固体電解質のうちの１種のみを用いてもよいし、複数種類を混合して用いてもよい。 The solid electrolyte layer 11 is composed of a sintered body of solid electrolyte particles. Specific examples of the solid electrolyte preferably used include a lithium-containing phosphate compound having a NASICON structure, an oxide solid electrolyte having a perovskite structure, and an oxide solid electrolyte having a garnet-type or garnet-like structure. As the lithium-containing phosphate compound having preferably NASICON structure used Li x M y (PO 4) 3 (0.9 ≦ x ≦ 1.9,1.9 ≦ y ≦ 2.1, M is, Ti, Ge , Al, Ga, and Zr). Specific examples of the lithium-containing phosphate compound having a NASICON structure that is preferably used include, for example, Li 1.4 Al 0.4 Ge 1.6 (PO 4 ) 3 , Li 1.2 Al 0.2 Ti 1.8 (PO 4 ) 3 and the like. Specific examples of the oxide solid electrolyte having a perovskite structure preferably used include La 0.55 Li 0.35 TiO 3 and the like. Specific examples of the oxide solid electrolyte having a garnet-type or garnet-type similar structure preferably used include Li 7 La 3 Zr 2 O 12 . Only one of these solid electrolytes may be used, or a plurality of types may be mixed and used.
　図３に示すように、複数の全固体蓄電エレメント１０の少なくとも一部は、可撓性を有する絶縁性シート２０に埋め込まれている。本実施形態では、具体的には、複数の全固体蓄電エレメント１０の全体が、絶縁性シート２０に埋め込まれている。 As shown in FIG. 3, at least a part of the plurality of all-solid-state electricity storage elements 10 is embedded in an insulating sheet 20 having flexibility. In the present embodiment, specifically, the entirety of the plurality of all solid state power storage elements 10 is embedded in the insulating sheet 20.
　絶縁性シート２０は、可撓性及び絶縁性を有するシートであれば特に限定されない。絶縁性シート２０は、例えば、樹脂、エラストマー等により構成することができる。可撓性を実現する観点からは、常温でゴム状弾性体である高分子物質のエラストマーから構成されたシートがより好ましく、例えばゴムなどの熱硬化性エラストマー、ゴム状弾性体、熱可塑性エラストマー等により構成することができる。ゴムには、天然ゴムと合成ゴムがあるが、品質が安定する合成ゴムがより好ましく用いられる。合成ゴムとしては、シリコーンゴム、アクリルゴム、イソプレンゴム、ウレタンゴム、エチレン・酢酸ビニルゴム、エチレンプロピレンジエンゴム、スチレン・ブタジエンゴム、二トリルブタジエンラバー、ブタジエンラバー、ブチルゴム、フッ素ゴム・バイトンなどがあるが、これらに限定されることはなく、これらを二つ以上組み合わせて使用してもよい。熱可塑性エラストマーとしては、スチレン系、スチレン・ブタジエン系、スチレン・イソプレン系、オレフィン系、ポリブタジエン系、アルケン系、塩ビ系、ウレタン系、アミド系の物質がある。これらに限定されることはなく、これらを二つ以上組み合わせて使用してもよい。 The insulating sheet 20 is not particularly limited as long as it is a flexible and insulating sheet. The insulating sheet 20 can be made of, for example, a resin, an elastomer, or the like. From the viewpoint of realizing flexibility, a sheet made of a high molecular weight elastomer that is a rubber-like elastic body at room temperature is more preferable. For example, a thermosetting elastomer such as rubber, a rubber-like elastic body, a thermoplastic elastomer, etc. Can be configured. The rubber includes natural rubber and synthetic rubber, but synthetic rubber with stable quality is more preferably used. Synthetic rubbers include silicone rubber, acrylic rubber, isoprene rubber, urethane rubber, ethylene / vinyl acetate rubber, ethylene propylene diene rubber, styrene / butadiene rubber, nitrile butadiene rubber, butadiene rubber, butyl rubber, fluorine rubber and viton. However, the present invention is not limited to these, and two or more of these may be used in combination. Thermoplastic elastomers include styrene, styrene / butadiene, styrene / isoprene, olefin, polybutadiene, alkene, vinyl chloride, urethane, and amide materials. There is no limitation to these, and two or more of these may be used in combination.
　図３に示すように、複数の全固体蓄電エレメント１０は、それぞれ、絶縁性シート２０の厚み方向（ｚ軸方向）において、一方側に第１の電極１２が位置し、他方側に第２の電極１３が位置するように配されている。図１～図３に示すように、複数の全固体蓄電エレメント１０は、可撓性接続部材３０によって接続されている。可撓性接続部材３０は、複数の全固体蓄電エレメント１０のそれぞれの第１の電極１２を接続している第１の可撓性接続部材３１（図１を参照。）と、第２の電極１３を接続している第２の可撓性接続部材３２（図２を参照。）とを含む。 As shown in FIG. 3, each of the plurality of all-solid-state electricity storage elements 10 includes a first electrode 12 on one side and a second side on the other side in the thickness direction (z-axis direction) of the insulating sheet 20. It arrange | positions so that the electrode 13 may be located. As shown in FIGS. 1 to 3, the plurality of all-solid-state electricity storage elements 10 are connected by a flexible connecting member 30. The flexible connection member 30 includes a first flexible connection member 31 (see FIG. 1) connecting the first electrodes 12 of the plurality of all-solid-state electricity storage elements 10 and a second electrode. 13 and a second flexible connecting member 32 (see FIG. 2).
　具体的には、本実施形態では、第１及び第２の可撓性接続部材３１，３２は、ｘ軸方向に沿って配された複数の全固体蓄電エレメント１０を並列に電気的に接続している。その第１及び第２の可撓性接続部材３１，３２により並列に接続されており、ｘ軸方向に沿って配列された複数の全固体蓄電エレメント１０の行が複数設けられている。並列に接続された複数の全固体蓄電エレメント１０の行が、第１及び第２の可撓性接続部材３１，３２により並列に接続されている。 Specifically, in the present embodiment, the first and second flexible connection members 31 and 32 electrically connect a plurality of all-solid-state power storage elements 10 arranged along the x-axis direction in parallel. ing. The first and second flexible connection members 31 and 32 are connected in parallel, and a plurality of rows of the all-solid-state power storage elements 10 arranged along the x-axis direction are provided. A plurality of rows of all solid state power storage elements 10 connected in parallel are connected in parallel by first and second flexible connection members 31 and 32.
　なお、第１及び第２の可撓性接続部材３１，３２は、可撓性及び導電性を有する部材であれば特に限定されない。第１及び第２の可撓性接続部材３１，３２は、例えば、金属等からなる導電性を有する材料により構成することができる。第１及び第２の可撓性接続部材３１，３２は、例えば、ワイヤー状であってもよいし、帯状であってもよい。 The first and second flexible connecting members 31 and 32 are not particularly limited as long as they are members having flexibility and conductivity. The 1st and 2nd flexible connection members 31 and 32 can be comprised with the material which has the electroconductivity which consists of metals etc., for example. The first and second flexible connecting members 31 and 32 may be, for example, a wire shape or a belt shape.
　蓄電シート１では、複数の全固体蓄電エレメント１０の少なくとも一部が絶縁性シート２０に埋め込まれており、複数の全固体蓄電エレメント１０を電気的に接続している可撓性接続部材３０が絶縁性シート２０内に配されている。すなわち、全固体蓄電エレメント１０と可撓性接続部材３０とが絶縁性シート２０内において接続されている。このため、例えば、蓄電シート１が可撓したときにおいても、可撓性接続部材３０が全固体蓄電エレメント１０から剥離しにくい。従って、蓄電シート１は、可撓性を有するにも関わらず、優れた信頼性を有している。 In the electricity storage sheet 1, at least a part of the plurality of all solid state electricity storage elements 10 is embedded in the insulating sheet 20, and the flexible connection member 30 electrically connecting the plurality of all solid state electricity storage elements 10 is insulated. The sheet 20 is disposed in the adhesive sheet 20. That is, the all-solid-state electricity storage element 10 and the flexible connection member 30 are connected in the insulating sheet 20. For this reason, for example, even when the electricity storage sheet 1 is flexible, the flexible connection member 30 is unlikely to peel from the all-solid electricity storage element 10. Therefore, the electricity storage sheet 1 has excellent reliability despite having flexibility.
　蓄電シート１の可撓性を向上する観点から、全固体蓄電エレメント１０の稜線部及び角部の少なくとも一方が面取り状又は丸められた形状を有する直方体状であることが好ましく、全固体蓄電エレメント１０の稜線部及び角部の両方が面取り状又は丸められた形状を有する直方体状であることがより好ましい。 From the viewpoint of improving the flexibility of the electricity storage sheet 1, it is preferable that at least one of the ridge line portion and the corner portion of the all solid electricity storage element 10 has a rectangular parallelepiped shape having a chamfered shape or a rounded shape. It is more preferable that both of the ridge line part and the corner part of the slab have a rectangular parallelepiped shape having a chamfered shape or a rounded shape.
　同様の観点から、全固体蓄電エレメント１０の最長辺の長さが１０ｍｍ以下であることが好ましく、１ｍｍ以下であることがより好ましく、０．６ｍｍ以下であることがさらに好ましい。但し、全固体蓄電エレメント１０が小さすぎると、蓄電シート１の容量やエネルギー密度が低くなりすぎる場合がある。従って、全固体蓄電エレメント１０の最長辺の長さは、０．１ｍｍ以上であることが好ましく、０．４ｍｍ以上であることがより好ましい。 From the same viewpoint, the length of the longest side of the all-solid-state electricity storage element 10 is preferably 10 mm or less, more preferably 1 mm or less, and further preferably 0.6 mm or less. However, if the all-solid-state electricity storage element 10 is too small, the capacity and energy density of the electricity storage sheet 1 may be too low. Accordingly, the length of the longest side of the all-solid-state electricity storage element 10 is preferably 0.1 mm or more, and more preferably 0.4 mm or more.
　また、蓄電シート１では、配置する全固体蓄電エレメント１０の個数を異ならせたり、全固体蓄電エレメント１０の容量を変化させることにより、蓄電シート１の容量を自由に変化させることができる。 Further, in the electricity storage sheet 1, the capacity of the electricity storage sheet 1 can be freely changed by changing the number of all solid electricity storage elements 10 to be arranged or changing the capacity of the all solid electricity storage elements 10.
　本実施形態では、蓄電シート１が矩形状である例について説明したが、本発明はこれに限定されない。蓄電シート１は、例えば、矩形状以外の多角形状であってもよいし、円形状、楕円形、長円形等であってもよい。 In the present embodiment, the example in which the power storage sheet 1 is rectangular has been described, but the present invention is not limited to this. The electricity storage sheet 1 may have, for example, a polygonal shape other than a rectangular shape, a circular shape, an elliptical shape, an oval shape, or the like.
　次に、本実施形態において説明した蓄電シート１を用いた電池２について、図６及び図７を参照しながら説明する。 Next, the battery 2 using the electricity storage sheet 1 described in the present embodiment will be described with reference to FIGS.
　電池２は、外装体３を備えている。外装体３には、蓄電シート１が収容されている。蓄電シート１は、どのような形態で外装体３内に収容されていてもよい。蓄電シート１は、可撓性を有するため、例えば、巻回体として外装体３内に収容することもできるし、例えば、九十九折状にされた状態で外装体３内に収容することもできる。また、複数枚の蓄電シート１の積層体を外装体３内に収容してもよい。 The battery 2 includes an exterior body 3. A power storage sheet 1 is accommodated in the exterior body 3. The electricity storage sheet 1 may be accommodated in the exterior body 3 in any form. Since the electricity storage sheet 1 has flexibility, it can be accommodated in the exterior body 3 as a wound body, for example, or it can be accommodated in the exterior body 3 in a folded state, for example. You can also. Further, a laminate of a plurality of power storage sheets 1 may be accommodated in the exterior body 3.
　なお、全固体蓄電エレメント１０の一部が絶縁性シート２０から露出している場合には、蓄電シート１とセパレータとを積層した状態で巻回することが好ましい。そうすることにより短絡不良が発生することを抑制することができる。 In addition, when a part of all the solid electrical storage element 10 is exposed from the insulating sheet 20, it is preferable to wind in the state which accumulated the electrical storage sheet 1 and the separator. By doing so, it is possible to suppress occurrence of a short circuit failure.
　外装体３は、第２の可撓性接続部材３２と接続された正極端子３ａと、第１の可撓性接続部材３１と接続された負極端子３ｂとを備えている。 The exterior body 3 includes a positive electrode terminal 3 a connected to the second flexible connection member 32 and a negative electrode terminal 3 b connected to the first flexible connection member 31.
　外装体３内には、樹脂が充填されている。この樹脂によって外装体３と蓄電シート１とが固定されている。このため、例えば、電池２に衝撃や振動が加わったとしても蓄電シート１に含まれる全固体蓄電エレメント１０同士が衝突等することにより全固体蓄電エレメント１０が破損することが抑制されている。 The exterior body 3 is filled with resin. The exterior body 3 and the electricity storage sheet 1 are fixed by this resin. For this reason, for example, even if an impact or vibration is applied to the battery 2, the all-solid power storage element 10 is prevented from being damaged due to collision between the all-solid power storage elements 10 included in the power storage sheet 1.
　上述のように、蓄電シート１は、優れた信頼性を有している。このため、電池２も、衝撃や振動が加わった際にも容量が低下しにくく、優れた信頼性を有している。 As described above, the electricity storage sheet 1 has excellent reliability. For this reason, the battery 2 is also less likely to have a reduced capacity even when an impact or vibration is applied, and has excellent reliability.
　なお、本実施形態では、外装体３が両端が閉口された円筒状である例について説明した。但し、本発明において、外装体３は、この形状に限定されない。例えば、外装体３は、直方体状であってもよい。すなわち、本発明に係る電池は、円柱状の電池、ボタン型の電池、直方体状の電池等であってもよい。 In the present embodiment, an example in which the exterior body 3 has a cylindrical shape with both ends closed has been described. However, in the present invention, the exterior body 3 is not limited to this shape. For example, the exterior body 3 may have a rectangular parallelepiped shape. That is, the battery according to the present invention may be a cylindrical battery, a button-type battery, a rectangular parallelepiped battery, or the like.
　また、本発明に係る電池は、例えば、外装体に収納されていない蓄電シートにより構成されていてもよい。本発明に係る電池では、例えば、蓄電シートが可撓性を有する外装体に収納されていてもよい。これらの場合、可撓性を有する電池を実現することができる。 Moreover, the battery according to the present invention may be constituted by, for example, a power storage sheet that is not housed in the exterior body. In the battery according to the present invention, for example, the electricity storage sheet may be housed in a flexible exterior body. In these cases, a flexible battery can be realized.
　本発明に係る電池は、一次電池であってもよいし、二次電池であってもよい。 The battery according to the present invention may be a primary battery or a secondary battery.
　以下、本発明の好ましい実施形態の他の例について説明する。以下の説明において、上記第１の実施形態と実質的に共通の機能を有する部材を共通の符号で参照し、説明を省略する。 Hereinafter, another example of the preferred embodiment of the present invention will be described. In the following description, members having substantially the same functions as those of the first embodiment are referred to by the same reference numerals, and description thereof is omitted.
　（第２～第４の実施形態）
　図８は、第２の実施形態に係る蓄電シート１ａの模式的平面図である。図９は、図８の線ＩＸ－ＩＸにおける模式的断面図である。図１０は、第２の実施形態に係る蓄電シート１ｂの模式的断面図である。図１１は、第２の実施形態に係る蓄電シート１ｃの模式的断面図である。なお、図９は、図１０の線ＩＸ－ＩＸにおける模式的断面図でもある。 (Second to fourth embodiments)
FIG. 8 is a schematic plan view of a power storage sheet 1a according to the second embodiment. FIG. 9 is a schematic cross-sectional view taken along line IX-IX in FIG. FIG. 10 is a schematic cross-sectional view of a power storage sheet 1b according to the second embodiment. FIG. 11 is a schematic cross-sectional view of a power storage sheet 1c according to the second embodiment. FIG. 9 is also a schematic cross-sectional view taken along line IX-IX in FIG.
　上記第１の実施形態では、蓄電シート１において、ｘ軸方向に配された複数の全固体蓄電エレメント１０が並列に接続されている例について説明した。但し、本発明において、蓄電シートに含まれる複数の全固体蓄電エレメントの接続態様は特に限定されない。 In the first embodiment, the example in which a plurality of all-solid power storage elements 10 arranged in the x-axis direction are connected in parallel in the power storage sheet 1 has been described. However, in this invention, the connection aspect of the some all-solid-state electrical storage element contained in an electrical storage sheet is not specifically limited.
　例えば、図８及び図９に示す蓄電シート１ａでは、ｘ軸方向に沿って配列された複数の全固体蓄電エレメントは、蓄電シート１ａの厚み方向（ｚ軸方向）において、一方側に第１の電極１２が位置し、他方側に第２の電極１３が位置するように配された全固体蓄電エレメント１０と、一方側に第２の電極１３が位置し、他方側に第１の電極１２が位置するように配された全固体蓄電エレメント１０とがｘ軸方向に沿って交互に位置するように配されている。ｘ軸方向に沿って配された複数の全固体蓄電エレメント１０は、可撓性接続部材３０によって直列に電気的に接続されている。その直列に接続された複数の全固体蓄電エレメント１０により構成された全固体蓄電エレメント行が複数設けられている。複数の全固体蓄電エレメント行は、可撓性接続部材３０によって並列に電気的に接続されている。 For example, in the electricity storage sheet 1a shown in FIG. 8 and FIG. 9, the plurality of all solid electricity storage elements arranged along the x-axis direction are first on one side in the thickness direction (z-axis direction) of the electricity storage sheet 1a. The all-solid-state electricity storage element 10 arranged so that the electrode 12 is located and the second electrode 13 is located on the other side, the second electrode 13 is located on one side, and the first electrode 12 is located on the other side The all-solid-state electricity storage elements 10 arranged so as to be located are arranged so as to be alternately located along the x-axis direction. A plurality of all-solid-state electricity storage elements 10 arranged along the x-axis direction are electrically connected in series by a flexible connection member 30. A plurality of all-solid-state electricity storage element rows each including a plurality of all-solid-state electricity storage elements 10 connected in series are provided. The plurality of all solid state power storage element rows are electrically connected in parallel by the flexible connection member 30.
　蓄電シート１ａでは、一の全固体蓄電エレメント１０と、その一の全固体蓄電エレメント１０に対してｘ軸方向の一方側に位置している全固体蓄電エレメント１０とを接続している可撓性接続部材と、上記一の全固体蓄電エレメント１０に対してｘ軸方向の他方側に位置している全固体蓄電エレメント１０とを接続している可撓性接続部材とが別体に設けられている。このため、蓄電シート１ａは、蓄電シート１よりも、ｘ軸方向において、高い可撓性を有している。 In the electricity storage sheet 1a, one all solid electricity storage element 10 is connected to the all solid electricity storage element 10 located on one side in the x-axis direction with respect to the one all solid electricity storage element 10. A connecting member and a flexible connecting member that connects the all solid state electricity storage element 10 located on the other side in the x-axis direction to the one all solid state electricity storage element 10 are provided separately. Yes. For this reason, the electricity storage sheet 1a is more flexible than the electricity storage sheet 1 in the x-axis direction.
　例えば、図１０に示す蓄電シート１ｂのように、全ての全固体蓄電エレメント１０が、可撓性接続部材３０によって並列に電気的に接続されていてもよい。また、蓄電シートに含まれる全ての全固体蓄電エレメントが可撓性接続部材によって直列に接続されていてもよい。 For example, all the all-solid-state electricity storage elements 10 may be electrically connected in parallel by the flexible connection member 30 as in the electricity storage sheet 1b shown in FIG. Moreover, all the all-solid-state electrical storage elements contained in the electrical storage sheet may be connected in series by the flexible connection member.
　例えば、図１１に示す蓄電シート１ｃのように、蓄電シート１ｃに含まれる全ての全固体蓄電エレメントが電気的に接続されていなくてもよい。蓄電シート１ｃでは、可撓性接続部材３０によって電気的に接続された複数の全固体蓄電エレメント１０からなる全固体蓄電エレメント群が複数設けられていてもよい。 For example, like the electricity storage sheet 1c shown in FIG. 11, all the all-solid-state electricity storage elements included in the electricity storage sheet 1c may not be electrically connected. In the electricity storage sheet 1 c, a plurality of all solid state electricity storage element groups including a plurality of all solid state electricity storage elements 10 electrically connected by the flexible connecting member 30 may be provided.
　（第５及び第６の実施形態）
　図１２は、第５及び第６の実施形態における全固体蓄電エレメント１０ａの模式的側面図である。図１３は、第５の実施形態に係る蓄電シート１ｄの模式的断面図である。図１４は、第６の実施形態に係る蓄電シート１ｅの模式的断面図である。 (Fifth and sixth embodiments)
FIG. 12 is a schematic side view of the all-solid-state electricity storage element 10a in the fifth and sixth embodiments. FIG. 13 is a schematic cross-sectional view of a power storage sheet 1d according to the fifth embodiment. FIG. 14 is a schematic cross-sectional view of an electricity storage sheet 1e according to the sixth embodiment.
　第５及び第６の実施形態における全固体蓄電エレメント１０ａでは、第１の電極１２と第２の電極１３とが固体電解質層１１の同じ主面上に設けられている。全固体蓄電エレメント１０ａでは、固体電解質層１１内に、相互に対向する第１及び第２の内部電極（図示せず）が少なくとも一対設けられている。第１の内部電極が第１の電極１２に接続されている。第２の内部電極が第２の電極１３に接続されている。 In the all-solid-state electricity storage element 10 a in the fifth and sixth embodiments, the first electrode 12 and the second electrode 13 are provided on the same main surface of the solid electrolyte layer 11. In the all-solid-state electricity storage element 10a, at least a pair of first and second internal electrodes (not shown) facing each other are provided in the solid electrolyte layer 11. The first internal electrode is connected to the first electrode 12. The second internal electrode is connected to the second electrode 13.
　図１３及び図１４に示すように、蓄電シート１ｄ、１ｅでは、蓄電シート１ｄ、１ｅの厚み方向（ｚ軸方向）において、第１及び第２の電極１２，１３が固体電解質層１１の一方側（ｚ１側）に位置するように複数の全固体蓄電エレメント１０ａが配されている。このため、可撓性接続部材３０は、全固体蓄電エレメント１０ａのｚ１側に位置している。 As shown in FIGS. 13 and 14, in the electricity storage sheets 1 d and 1 e, the first and second electrodes 12 and 13 are on one side of the solid electrolyte layer 11 in the thickness direction (z-axis direction) of the electricity storage sheets 1 d and 1 e. A plurality of all-solid-state electricity storage elements 10a are arranged so as to be located on the (z1 side). For this reason, the flexible connection member 30 is located on the z1 side of the all-solid-state electricity storage element 10a.
　蓄電シート１ｄでは、全固体蓄電エレメント１０ａのｚ１側部分と可撓性接続部材３０とが絶縁性シート２０内に位置しており、全固体蓄電エレメント１０ａのｚ２側の表面が絶縁性シート２０から露出している。 In the electricity storage sheet 1d, the z1 side portion of the all-solid electricity storage element 10a and the flexible connecting member 30 are located in the insulating sheet 20, and the surface on the z2 side of the all-solid electricity storage element 10a is separated from the insulation sheet 20. Exposed.
　蓄電シート１ｅでは、全固体蓄電エレメント１０ａのｚ１側部分と可撓性接続部材３０とが絶縁性シート２０内に位置しており、全固体蓄電エレメント１０ａのｚ２側の部分が絶縁性シート２０から露出している。 In the electricity storage sheet 1e, the z1 side portion of the all-solid electricity storage element 10a and the flexible connecting member 30 are located in the insulating sheet 20, and the z2 side portion of the all-solid electricity storage element 10a is separated from the insulating sheet 20. Exposed.
　蓄電シート１ｄ、１ｅにおいても、全固体蓄電エレメント１０と可撓性接続部材３０との接続部分が絶縁性シート２０内に位置しているため、蓄電シート１ｄ、１ｅが可撓した場合においても、全固体蓄電エレメント１０と可撓性接続部材３０とが剥離しにくい。従って、全固体蓄電エレメント１０の一部が露出している蓄電シート１ｄ、１ｅも、優れた信頼性を有している。 Even in the electricity storage sheets 1d and 1e, since the connection portion between the all-solid electricity storage element 10 and the flexible connection member 30 is located in the insulating sheet 20, even when the electricity storage sheets 1d and 1e are flexible, The all-solid-state electricity storage element 10 and the flexible connection member 30 are difficult to peel off. Therefore, the electricity storage sheets 1d and 1e from which a part of the all-solid electricity storage element 10 is exposed also have excellent reliability.
１、１ａ、１ｂ、１ｃ、１ｄ、１ｅ　　　：蓄電シート
２　　　：電池
３　　　：外装体
３ａ　　：正極端子
３ｂ　　：負極端子
１０、１０ａ　　：全固体蓄電エレメント
１１　　：固体電解質層
１２　　：第１の電極
１３　　：第２の電極
２０　　：絶縁性シート
３０　　：可撓性接続部材
３１　　：第１の可撓性接続部材
３２　　：第２の可撓性接続部材 1, 1a, 1b, 1c, 1d, 1e: power storage sheet 2: battery 3: exterior body 3a: positive electrode terminal 3b: negative electrode terminal 10, 10a: all solid power storage element 11: solid electrolyte layer 12: first electrode 13: Second electrode 20: Insulating sheet 30: Flexible connection member 31: First flexible connection member 32: Second flexible connection member

Claims (6)

  1. 　相互に間隔をおいて配された複数の全固体蓄電エレメントと、
    　前記複数の全固体蓄電エレメントの少なくとも一部が埋め込まれた、可撓性を有する絶縁性シートと、
    　前記絶縁性シート内に配されており、前記複数の全固体蓄電エレメントを電気的に接続している可撓性接続部材と、
    　を備える、蓄電シート。     A plurality of all-solid-state electricity storage elements spaced apart from each other;
    A flexible insulating sheet in which at least a part of the plurality of all-solid-state electricity storage elements is embedded;
    A flexible connecting member disposed in the insulating sheet and electrically connecting the plurality of all-solid-state electricity storage elements;
    A power storage sheet.
  2. 　前記全固体蓄電エレメントの稜線部及び角部の少なくとも一方が面取り状又は丸められた形状を有する直方体状である、請求項１に記載の蓄電シート。 2. The electricity storage sheet according to claim 1, wherein at least one of a ridge line portion and a corner portion of the all solid electricity storage element is a rectangular parallelepiped shape having a chamfered shape or a rounded shape.
  3. 　前記全固体蓄電エレメントの最長辺の長さが１０ｍｍ以下である、請求項１又は２に記載の蓄電シート。 The electric storage sheet according to claim 1 or 2, wherein the length of the longest side of the all solid electric storage element is 10 mm or less.
  4. 　前記複数の全固体蓄電エレメントは、一の方向に沿って配列された３つ以上の全固体蓄電エレメントを含み、
    　前記３つ以上の全固体蓄電エレメントのうちの一の全固体蓄電エレメントと、前記一の全固体蓄電エレメントに対して前記一の方向の一方側に位置する全固体蓄電エレメントとを接続している可撓性接続部材と、前記一の全固体蓄電エレメントに対して前記一の方向の他方側に位置する全固体蓄電エレメントとを接続している可撓性接続部材とが別体に設けられている、請求項１～３のいずれか一項に記載の蓄電シート。     The plurality of all-solid-state electricity storage elements include three or more all-solid-state electricity storage elements arranged along one direction,
    One all-solid-state electricity storage element of the three or more all-solid-state electricity storage elements is connected to the all-solid-state electricity storage element located on one side in the one direction with respect to the one all-solid-state electricity storage element. A flexible connection member and a flexible connection member that connects the all solid state electricity storage element located on the other side in the one direction to the one all solid state electricity storage element are provided separately. The electricity storage sheet according to any one of claims 1 to 3, wherein:
  5. 　請求項１～４のいずれか一項に記載の蓄電シートを備える、電池。 A battery comprising the electricity storage sheet according to any one of claims 1 to 4.
  6. 　巻回された前記蓄電シートを収容している外装体をさらに備える、請求項５に記載の電池。 The battery according to claim 5, further comprising an exterior body that accommodates the wound power storage sheet.
PCT/JP2018/003923 2017-02-23 2018-02-06 Power storage sheet and battery WO2018155157A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2017031848 2017-02-23
JP2017-031848 2017-02-23

Publications (1)

Publication Number Publication Date
WO2018155157A1 true WO2018155157A1 (en) 2018-08-30

Family

ID=63253208

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2018/003923 WO2018155157A1 (en) 2017-02-23 2018-02-06 Power storage sheet and battery

Country Status (1)

Country Link
WO (1) WO2018155157A1 (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007080812A (en) * 2005-08-18 2007-03-29 Matsushita Electric Ind Co Ltd Full solid lithium secondary battery and method of manufacturing same
JP2011513895A (en) * 2008-02-25 2011-04-28 アライアンス フォー サステイナブル エナジー リミテッド ライアビリティ カンパニー Flexible thin film lithium ion battery
WO2012147412A1 (en) * 2011-04-26 2012-11-01 日本メクトロン株式会社 Flexible circuit and method for manufacturing same
JP2013239435A (en) * 2012-04-17 2013-11-28 Semiconductor Energy Lab Co Ltd Power storage device and method of manufacturing the same
JP2015220103A (en) * 2014-05-19 2015-12-07 Tdk株式会社 Power storage device, electronic equipment using the same and power storage unit
JP2015220110A (en) * 2014-05-19 2015-12-07 Tdk株式会社 Power storage device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007080812A (en) * 2005-08-18 2007-03-29 Matsushita Electric Ind Co Ltd Full solid lithium secondary battery and method of manufacturing same
JP2011513895A (en) * 2008-02-25 2011-04-28 アライアンス フォー サステイナブル エナジー リミテッド ライアビリティ カンパニー Flexible thin film lithium ion battery
WO2012147412A1 (en) * 2011-04-26 2012-11-01 日本メクトロン株式会社 Flexible circuit and method for manufacturing same
JP2013239435A (en) * 2012-04-17 2013-11-28 Semiconductor Energy Lab Co Ltd Power storage device and method of manufacturing the same
JP2015220103A (en) * 2014-05-19 2015-12-07 Tdk株式会社 Power storage device, electronic equipment using the same and power storage unit
JP2015220110A (en) * 2014-05-19 2015-12-07 Tdk株式会社 Power storage device

Similar Documents

Publication Publication Date Title
CN105990598B (en) Electric storage element
KR102508381B1 (en) All-solid-state secondary battery and its manufacturing method
US20190326647A1 (en) Secondary battery and method of manufacturing the same
KR102303678B1 (en) All-solid-state battery stack
JP6780765B2 (en) Storage sheet and battery
US20190165413A1 (en) Lithium-ion secondary battery
WO2020256023A1 (en) Secondary battery
KR102165786B1 (en) Battery pack
KR20160085624A (en) Secondary battery having high rate capability and high energy density
JP2020136261A (en) All solid-state battery laminate
JP2011082039A (en) Nonaqueous electrolyte battery, and battery pack
EP3905416A1 (en) Battery
JP2004119043A (en) Battery pack
JP2015018670A (en) Bipolar battery
CN113767497A (en) Secondary battery
CN113711406A (en) Secondary battery
WO2018154927A1 (en) String-like battery
WO2018154926A1 (en) Power storage sheet and battery
WO2018155157A1 (en) Power storage sheet and battery
US11594762B2 (en) All solid storage element laminate and battery
WO2021106481A1 (en) Battery
JP7115559B2 (en) solid state battery
JP2010135154A (en) Nonaqueous electrolyte battery
JP5093666B2 (en) Lithium battery
KR20220169402A (en) Battery

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 18756720

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 18756720

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: JP