WO2023176311A1 - 二次電池 - Google Patents

二次電池 Download PDF

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Publication number
WO2023176311A1
WO2023176311A1 PCT/JP2023/005726 JP2023005726W WO2023176311A1 WO 2023176311 A1 WO2023176311 A1 WO 2023176311A1 JP 2023005726 W JP2023005726 W JP 2023005726W WO 2023176311 A1 WO2023176311 A1 WO 2023176311A1
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Prior art keywords
insulator
additional member
secondary battery
battery
additional
Prior art date
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Ceased
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PCT/JP2023/005726
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English (en)
French (fr)
Japanese (ja)
Inventor
直人 秋月
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Murata Manufacturing Co Ltd
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Murata Manufacturing Co Ltd
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Priority to JP2024507628A priority Critical patent/JP7740512B2/ja
Publication of WO2023176311A1 publication Critical patent/WO2023176311A1/ja
Priority to US18/762,226 priority patent/US20240356126A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • 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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/147—Lids or covers
    • H01M50/148—Lids or covers characterised by their shape
    • H01M50/152—Lids or covers characterised by their shape for cells having curved cross-section, e.g. round or elliptic
    • 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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/107—Primary casings; Jackets or wrappings characterised by their shape or physical structure having curved cross-section, e.g. round or elliptic
    • 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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/147—Lids or covers
    • H01M50/166—Lids or covers characterised by the methods of assembling casings with lids
    • H01M50/171—Lids or covers characterised by the methods of assembling casings with lids using adhesives or sealing agents
    • 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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/183—Sealing members
    • H01M50/184—Sealing members characterised by their shape or structure
    • 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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/183—Sealing members
    • H01M50/186—Sealing members characterised by the disposition of the sealing members
    • 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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/183—Sealing members
    • H01M50/19—Sealing members characterised by the material
    • H01M50/191—Inorganic material
    • 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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/183—Sealing members
    • H01M50/19—Sealing members characterised by the material
    • H01M50/193—Organic material
    • 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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/183—Sealing members
    • H01M50/19—Sealing members characterised by the material
    • H01M50/195—Composite material consisting of a mixture of organic and inorganic materials
    • 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
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/471—Spacing elements inside cells other than separators, membranes or diaphragms; Manufacturing processes thereof
    • H01M50/474—Spacing elements inside cells other than separators, membranes or diaphragms; Manufacturing processes thereof characterised by their position inside the cells
    • 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
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/471—Spacing elements inside cells other than separators, membranes or diaphragms; Manufacturing processes thereof
    • H01M50/477—Spacing elements inside cells other than separators, membranes or diaphragms; Manufacturing processes thereof characterised by their shape
    • 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
    • H01M50/543—Terminals
    • H01M50/545—Terminals formed by the casing of the cells
    • 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
    • H01M50/543—Terminals
    • H01M50/547—Terminals characterised by the disposition of the terminals on the cells
    • H01M50/548—Terminals characterised by the disposition of the terminals on the cells on opposite sides of the cell
    • 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

Definitions

  • the present invention relates to secondary batteries.
  • the present invention relates to a secondary battery equipped with an electrode assembly including a positive electrode, a negative electrode, and a separator.
  • secondary batteries are so-called storage batteries, they can be repeatedly charged and discharged, and are used for a variety of purposes.
  • secondary batteries are used in mobile devices such as mobile phones, smartphones, and notebook computers.
  • a secondary battery includes an electrode assembly in which electrode constituent layers including a positive electrode, a negative electrode, and a separator are laminated therebetween, and an exterior body that houses the electrode assembly.
  • an exterior part that houses an electrode assembly and an exterior part that covers the exterior part that houses the electrode assembly are sometimes used as the exterior body.
  • an insulator may be placed to seal between both exterior parts.
  • fillers may be arranged radially within the insulator. That is, the filler may be disposed to be distributed throughout the insulator.
  • fluid such as gas generated inside the battery and/or outside the battery may flow into the secondary battery or leak to the outside of the secondary battery. It has been found that there is still a possibility that the battery characteristics may deteriorate.
  • an object of the present invention is to provide a secondary battery that can suitably suppress the inflow of fluid such as gas into the battery and the leakage to the outside of the battery.
  • an electrode assembly In the present invention, an electrode assembly; a first exterior part that houses the electrode assembly and has an opening; a second exterior part that covers the opening and an outer surface of the first exterior part that forms the opening; an insulator disposed between the outer surface of the first exterior part and the second exterior part and surrounding the opening, A secondary battery is provided in the insulator, in which additional members are arranged circumferentially and intermittently around the opening.
  • a secondary battery that can suitably suppress the inflow of fluid such as gas into the battery and the leakage to the outside of the battery.
  • FIG. 1 is a cross-sectional view schematically showing an electrode assembly (FIG. 1(A): flat layered structure, FIG. 1(B): wound structure).
  • FIG. 2 is a perspective view schematically showing the configuration of a secondary battery of the present invention according to one embodiment.
  • FIG. 3 is an exploded perspective view schematically showing the configuration of a secondary battery of the present invention according to one embodiment.
  • FIG. 4 is a schematic diagram for explaining the arrangement of additional members according to one embodiment.
  • FIG. 5 is a schematic cross-sectional view for explaining the characteristics of the secondary battery of the present invention according to one embodiment.
  • FIG. 6 is a schematic diagram for explaining the arrangement of additional members according to one embodiment.
  • FIG. 7 is a schematic diagram for explaining the arrangement of additional members according to one embodiment.
  • FIG. 8 is a schematic diagram for explaining the arrangement of additional members according to one embodiment.
  • FIG. 9 is a schematic cross-sectional view for explaining the arrangement of additional members according to one embodiment.
  • FIG. 10 is a schematic cross-sectional view for explaining the arrangement of additional members according to one embodiment.
  • FIG. 11 is a schematic diagram for explaining the arrangement of additional members according to one embodiment based on the cross-sectional direction of the circumferential portion.
  • FIG. 12 is a schematic cross-sectional view for explaining how fluid moves from the outside of the battery to the inside of the battery in a conventional secondary battery.
  • FIG. 13 is a schematic cross-sectional view for explaining how fluid moves from inside the battery to outside the battery in a conventional secondary battery.
  • the "cross-sectional view” described directly or indirectly in this specification is based on a virtual cross-section of the secondary battery cut along the height direction.
  • the "vertical direction” and “horizontal direction” used directly or indirectly in this specification correspond to the vertical direction and the horizontal direction in the drawings, respectively. Unless otherwise specified, the same reference numerals or symbols indicate the same members/parts or the same meanings.
  • the stacking direction of the electrode assembly may correspond to the up-down direction, but the vertical downward direction (i.e., the direction in which gravity acts) corresponds to the "downward direction”, and the opposite direction corresponds to the "upward direction”. It can be considered to be equivalent.
  • Secondary battery refers to a battery that can be repeatedly charged and discharged. Therefore, the secondary battery according to the present invention is not excessively limited by its name, and may also include, for example, an electricity storage device.
  • a secondary battery includes an electrode assembly in which electrode constituent layers including a positive electrode, a negative electrode, and a separator are laminated.
  • An electrode assembly 10 is illustrated in FIGS. 1(A) and 1(B). As shown in FIGS. 1(A) and 1(B), a positive electrode 1 and a negative electrode 2 are stacked with a separator 3 in between to form an electrode constituent layer 5, and at least one electrode constituent layer 5 is formed.
  • the electrode assembly is constructed by laminating the above layers.
  • the electrode constituent layer 5 has a planar layered structure in which it is not wound but is stacked in a planar manner.
  • FIG. 1A the electrode constituent layer 5 has a planar layered structure in which it is not wound but is stacked in a planar manner.
  • FIG. 1A the electrode constituent layer 5 has a planar layered structure in which it is not wound but is stacked in a planar manner.
  • FIG. 1A the electrode constituent layer 5 has a planar layered structure in which it is not wound but is
  • the electrode constituent layer 5 has a wound laminated structure wound in a spiral shape. That is, in FIG. 1(B), the electrode constituent layer including a positive electrode, a negative electrode, and a separator disposed between the positive electrode and the negative electrode has a wound structure in which it is wound into a roll shape. In a secondary battery, such an electrode assembly is enclosed in an outer case together with an electrolyte (for example, a non-aqueous electrolyte).
  • an electrolyte for example, a non-aqueous electrolyte.
  • the structure of the electrode assembly is not necessarily limited to a flat layered structure or a wound structure.
  • the electrode assembly may be a so-called stack-and-layer structure in which a positive electrode, a separator, and a negative electrode are laminated on a long film and then folded. It may have a folding structure.
  • the positive electrode is composed of at least a positive electrode material layer and a positive electrode current collector.
  • a positive electrode material layer is provided on at least one side of the positive electrode current collector.
  • the positive electrode material layer contains a positive electrode active material as an electrode active material.
  • each of the plurality of positive electrodes in the electrode assembly may have a positive electrode material layer provided on both sides of a positive electrode current collector, or may have a positive electrode material layer provided only on one side of the positive electrode current collector. It may be something that exists.
  • the negative electrode is composed of at least a negative electrode material layer and a negative electrode current collector.
  • a negative electrode material layer is provided on at least one side of the negative electrode current collector.
  • the negative electrode material layer contains a negative electrode active material as an electrode active material.
  • the plurality of negative electrodes in the electrode assembly may each have a negative electrode material layer provided on both sides of a negative electrode current collector, or may have a negative electrode material layer provided only on one side of the negative electrode current collector. It may be something that exists.
  • the electrode active materials contained in the positive and negative electrodes are substances that are directly involved in the transfer of electrons in secondary batteries, and are the main materials of the positive and negative electrodes that are responsible for charging and discharging, that is, battery reactions. be. More specifically, ions are brought into the electrolyte due to "the positive electrode active material contained in the positive electrode material layer" and "the negative electrode active material contained in the negative electrode material layer", and these ions are brought into contact between the positive electrode and the negative electrode. The battery moves and exchanges electrons to perform charging and discharging.
  • the positive electrode material layer and the negative electrode material layer may be layers capable of intercalating and deintercalating lithium ions.
  • the secondary battery according to the present invention may be a non-aqueous electrolyte secondary battery in which lithium ions move between the positive electrode and the negative electrode via the non-aqueous electrolyte to charge and discharge the battery.
  • the secondary battery according to the present invention corresponds to a so-called "lithium ion battery", and the positive electrode and the negative electrode have a layer capable of inserting and extracting lithium ions.
  • the positive electrode active material of the positive electrode material layer is composed of, for example, granules, and a binder may be included in the positive electrode material layer for more sufficient contact between the particles and shape retention. Furthermore, a conductive additive may be included in the positive electrode material layer in order to facilitate the transmission of electrons that promote battery reactions. Similarly, when the negative electrode active material of the negative electrode material layer is composed of, for example, granules, a binder may be included for more sufficient contact between the particles and shape retention, and for the transfer of electrons that promote battery reactions. A conductive additive may be included in the negative electrode material layer to facilitate this. As described above, since a plurality of components are contained, the positive electrode material layer and the negative electrode material layer can also be referred to as a "positive electrode composite material layer" and a "negative electrode composite material layer,” respectively.
  • the positive electrode active material may be a material that contributes to intercalation and desorption of lithium ions.
  • the positive electrode active material may be, for example, a lithium-containing composite oxide.
  • the positive electrode active material may be a lithium transition metal composite oxide containing lithium and at least one transition metal selected from the group consisting of cobalt, nickel, manganese, and iron. That is, in the positive electrode material layer of the secondary battery according to the present invention, such a lithium transition metal composite oxide is preferably contained as a positive electrode active material.
  • the positive electrode active material may be lithium cobalt oxide, lithium nickel oxide, lithium manganate, lithium iron phosphate, or a material in which some of the transition metals thereof are replaced with another metal.
  • such positive electrode active materials may be contained as a single species, they may be contained in a combination of two or more types.
  • the binder that can be contained in the positive electrode material layer is not particularly limited, but includes polyvinylidene fluoride, vinylidene fluoride-hexafluoropropylene copolymer, vinylidene fluoride-tetrafluoroethylene copolymer, and polytetrafluoroethylene. At least one selected from the group consisting of:
  • the conductive additive that can be included in the positive electrode material layer is not particularly limited, but includes carbon black such as thermal black, furnace black, channel black, Ketjen black, and acetylene black, graphite, carbon nanotubes, and vapor-phase growth. Examples include at least one selected from carbon fibers such as carbon fibers, metal powders such as copper, nickel, aluminum and silver, and polyphenylene derivatives.
  • the thickness of the positive electrode material layer is not particularly limited, but may be 1 ⁇ m or more and 300 ⁇ m or less, for example, 5 ⁇ m or more and 200 ⁇ m or less.
  • the thickness dimension of the positive electrode material layer is the thickness inside the secondary battery, and the average value of the measured values at ten arbitrary points may be adopted.
  • the negative electrode active material may be a material that contributes to intercalation and desorption of lithium ions. From this point of view, the negative electrode active material may be, for example, various carbon materials, oxides, and/or lithium alloys.
  • Examples of various carbon materials for the negative electrode active material include graphite (natural graphite and/or artificial graphite), hard carbon, soft carbon, and/or diamond-like carbon.
  • graphite has high electronic conductivity and excellent adhesion to the negative electrode current collector.
  • the negative electrode active material is at least selected from the group consisting of silicon, silicon oxide, tin oxide, tin alloy, titanium oxide such as lithium titanate, metallic lithium, indium oxide, zinc oxide and lithium alloy, silicon alloy, etc. One type can be mentioned.
  • the lithium alloy of the negative electrode active material may be any metal that can be alloyed with lithium, such as Al, Si, Pb, Sn, In, Bi, Ag, Ba, Ca, Hg, Pd, Pt, Te, Zn, It may be a binary, ternary or higher alloy of metal such as La and lithium. Such an active material may have an amorphous structure. This is because deterioration caused by non-uniformity such as grain boundaries or defects is less likely to occur.
  • the binder included in the negative electrode material layer is not particularly limited, but at least one selected from the group consisting of styrene-butadiene rubber, polyacrylic acid, polyvinylidene fluoride, polyimide resin, and polyamideimide resin. can be mentioned.
  • the binder contained in the negative electrode material layer may be styrene-butadiene rubber.
  • the conductive additive included in the negative electrode material layer is not particularly limited, but includes carbon black such as thermal black, furnace black, channel black, Ketjen black, and acetylene black, graphite, carbon nanotubes, and vapor phase growth. Examples include at least one selected from carbon fibers such as carbon fibers, metal powders such as copper, nickel, aluminum and silver, and polyphenylene derivatives.
  • the negative electrode material layer may contain a component resulting from a thickener component (for example, carboxymethylcellulose) used during battery manufacture.
  • the thickness of the negative electrode material layer is not particularly limited, but may be 1 ⁇ m or more and 300 ⁇ m or less, for example, 5 ⁇ m or more and 200 ⁇ m or less.
  • the thickness dimension of the negative electrode material layer is the thickness inside the secondary battery, and the average value of the measured values at ten arbitrary locations may be adopted.
  • the positive electrode current collector and negative electrode current collector used in the positive electrode and negative electrode are members that help collect and supply electrons generated in the electrode active material due to battery reactions.
  • Such an electrode current collector may be a sheet-like metal member. Further, the electrode current collector may have a porous or perforated form.
  • the current collector may be metal foil, punched metal, mesh, expanded metal, or the like.
  • the positive electrode current collector used in the positive electrode is preferably made of a metal foil containing at least one selected from the group consisting of aluminum, stainless steel, nickel, etc., and may be, for example, an aluminum foil.
  • the negative electrode current collector used in the negative electrode is preferably made of a metal foil containing at least one selected from the group consisting of copper, stainless steel, nickel, etc., and may be a copper foil, for example.
  • the thickness dimensions of the positive electrode current collector and the negative electrode current collector are not particularly limited, but may be 1 ⁇ m or more and 100 ⁇ m or less, for example, 10 ⁇ m or more and 70 ⁇ m or less.
  • the thickness dimension of the positive electrode current collector and the negative electrode current collector is the thickness inside the secondary battery, and the average value of the measured values at arbitrary 10 points may be adopted.
  • the separator used for the positive and negative electrodes is a member provided from the viewpoint of preventing short circuits due to contact between the positive and negative electrodes and retaining electrolyte.
  • the separator can be said to be a member that allows ions to pass through while preventing electronic contact between the positive electrode and the negative electrode.
  • separators are porous or microporous insulators that have a membrane morphology due to their small thickness.
  • a microporous membrane made of polyolefin may be used as the separator.
  • the microporous membrane used as the separator may contain, for example, only polyethylene (PE) or polypropylene (PP) as the polyolefin.
  • the separator may be a laminate composed of a "microporous membrane made of PE" and a "microporous membrane made of PP.”
  • the surface of the separator may be covered with an inorganic particle coating layer and/or an adhesive layer.
  • the surface of the separator may have adhesive properties.
  • the separator is not particularly limited by its name, and may be a solid electrolyte, a gel electrolyte, and/or insulating inorganic particles having similar functions.
  • Each thickness dimension of the separator is not particularly limited, but may be 1 ⁇ m or more and 100 ⁇ m or less, for example, 2 ⁇ m or more and 20 ⁇ m or less.
  • the thickness of the separator is the thickness inside the secondary battery (particularly the thickness between the positive electrode and the negative electrode), and the average value of the measured values at ten arbitrary points may be used.
  • an electrode assembly consisting of electrode constituent layers including a positive electrode, a negative electrode, and a separator may be enclosed in an exterior body together with an electrolyte.
  • the electrolyte may be a "non-aqueous" electrolyte that includes an organic electrolyte and an organic solvent, or it may be an "aqueous” electrolyte that includes water.
  • the electrolyte is preferably a "non-aqueous" electrolyte such as an organic electrolyte or an organic solvent. That is, it is preferable that the electrolyte is a non-aqueous electrolyte.
  • the electrolyte In the electrolyte there will be metal ions released from the electrodes (positive and/or negative), and therefore the electrolyte can assist in the movement of metal ions in battery reactions.
  • the electrolyte may have a liquid or gel form.
  • a non-aqueous electrolyte is an electrolyte containing a solvent and a solute.
  • the solvent may be an organic solvent.
  • a specific organic solvent for the non-aqueous electrolyte may contain at least carbonate.
  • Such carbonates may be cyclic carbonates and/or linear carbonates.
  • examples of the cyclic carbonates include at least one selected from the group consisting of propylene carbonate (PC), ethylene carbonate (EC), butylene carbonate (BC), and vinylene carbonate (VC). be able to.
  • Examples of chain carbonates include at least one selected from the group consisting of dimethyl carbonate (DMC), diethyl carbonate (DEC), ethylmethyl carbonate (EMC), and dipropyl carbonate (DPC).
  • non-aqueous electrolyte a combination of cyclic carbonates and chain carbonates may be used as the non-aqueous electrolyte, for example a mixture of ethylene carbonate and diethyl carbonate may be used.
  • Li salt such as LiPF 6 and/or LiBF 4 may be used as a specific solute of the non-aqueous electrolyte.
  • FIG. 2 is a perspective view schematically showing the configuration of a secondary battery of the present invention according to one embodiment.
  • FIG. 3 is an exploded perspective view schematically showing the configuration of a secondary battery of the present invention according to one embodiment.
  • a secondary battery includes a first exterior section 40, a second exterior section 50, and a first exterior section 40 and a second exterior section. 50 and an insulator 70 provided therebetween.
  • the first exterior part 40 has an opening 45 and can accommodate the electrode assembly.
  • the outer surface 41 of the first sheath 40 defines an opening 45 .
  • Insulator 70 surrounds opening 45 and is disposed between outer surface 41 of first exterior portion 40 and second exterior portion 50 .
  • the second exterior portion 50 is provided to cover the opening 45 of the first exterior portion 40 and the outer surface 41 of the first exterior portion 40 that forms the opening 45 .
  • the insulator 70 is sandwiched between the first exterior part 40 and the second exterior part 50.
  • the first exterior part 40 and the second exterior part 50 are bonded and insulated by an insulator 70 to constitute the exterior body of the secondary battery.
  • the exterior body encloses and protects the electrode assembly 10, electrolyte 20, etc. inside the battery. Because of the "sealing” and “protection", it is possible for gas such as gas to flow in from outside the battery or from inside the battery through the first exterior part 40 and the second exterior part 50 themselves. It cannot leak.
  • the insulator 70 serves to bond and insulate the first exterior part 40 and the second exterior part 50.
  • a fluid such as a gas can more easily penetrate and permeate therein than in the first exterior part 40 and the second exterior part 50. Therefore, fluid such as gas can flow into the battery and/or leak out of the battery through the insulator 70. That is, the insulator 70 can serve as a passageway for fluid movement, such as gas, between the inside of the battery and the outside of the battery.
  • the secondary battery according to one embodiment of the present invention is characterized by the configuration of the insulator 70 described above (see FIG. 4).
  • additional members 80 are disposed in the insulator 70 in a circumferential manner around the opening 45, and are disposed intermittently. Due to the arrangement of the additional member 80, the insulator 70 is roughly divided into a region where the additional member 80 is provided and a region where the additional member 80 is not provided. This arrangement of the additional member 80 is different from the arrangement in which the filler is arranged radially in the radial direction of the insulator 70. In other words, they are not distributed throughout the insulator.
  • the "additional member” in this specification means a member that is additionally provided to the insulator.
  • “circular shape” means a shape and/or appearance that goes around a predetermined range.
  • the “circular” arrangement of the additional members in this specification means an arrangement in which the area where the additional members are placed completely surrounds the area where no additional members are placed. .
  • “intermittent” in this specification refers to a state that is interrupted or continues. In other words, “intermittent” refers to a state in which there are interrupted parts between consecutive parts.
  • the “intermittent” arrangement of the additional member in this specification may refer to an arrangement where there are locations where the additional member is present and locations where the additional member is not present.
  • the "intermittent" arrangement of the additional members may mean that the additional members are continuously arranged at intervals.
  • the “intermittent” arrangement of the additional members may be continuously arranged at regular intervals, or may be continuously arranged at irregular intervals.
  • “the additional members are disposed circularly and intermittently” means that the additional members are disposed continuously at intervals so as to go around a predetermined range, as shown in FIG. means that it has been
  • the secondary battery of the present invention can achieve the effects described below.
  • FIGS. 12 and 13 show schematic plan views of an insulator of a conventional secondary battery.
  • fillers may be arranged radially within an insulator 70'. That is, the filler may be disposed to be distributed throughout the insulator.
  • the filler is sparsely arranged as a whole, so that the fluid between the inside of the secondary battery and the outside of the secondary battery within the insulator 70' is cannot sufficiently reduce the number of paths that can be traveled by. That is, in the distributed configuration, fluid such as gas easily moves between the inside of the secondary battery and the outside of the secondary battery via the insulator 70'.
  • moisture 90' from the external environment may enter the electrode assembly 10' inside the secondary battery through the insulator 70' (see FIG. 12).
  • the volatilized electrolyte 91' and the like inside the secondary battery may leak to the outside of the secondary battery through the insulator 70' (see FIG. 13). If such fluid movement occurs, there is a possibility that the battery characteristics of the secondary battery will deteriorate.
  • the additional member 80 in the insulator 70 of the secondary battery according to an embodiment of the present invention, as shown in FIG. has been done.
  • the additional member 80 can be more suitably provided.
  • the additional members 80 are "arranged in a circumferential manner with respect to the opening, and The "intermittent" arrangement allows for a relatively dense arrangement of the additional members 80 in localized portions of the insulator 70.
  • a region located inside the circumferential shape of the additional member 80 arranged in a circumferential manner for example, one region of the insulator 70, for example, a region proximal to the center side of the insulator 70
  • the additional member is arranged (e.g., a region that is located outside the circumferential shape of the additional member 80 arranged in a circumferential manner) and a region located outside the circumferential shape of the additional member 80 (e.g., the other region of the insulator 70, for example, a region proximal to the outer circumferential side of the insulator 70) ) (corresponding to the area where no additional member is arranged)
  • the circular shape of the additional members 80 arranged in a circular manner means a shape formed by the additional members 80 arranged in a circular manner.
  • the circumferential shape of the additional member 80 shown in FIGS. 4 and 6 can be considered to be annular or circular.
  • the arrangement of the additional members needs to be both “circular” and “intermittent”.
  • the additional member may be arranged in such a way that it goes around a predetermined range (for example, the opening of the first exterior part).
  • a relatively dense arrangement cannot be achieved in localized portions of the insulator.
  • the additional members tend to be sparsely arranged in the insulator, and it is difficult to prevent fluid such as gas from flowing into the battery and leaking to the outside of the battery.
  • the additional member may be arranged in such a manner that it goes around a predetermined range of the insulator (for example, the opening of the first exterior part). (for example, a semicircular arrangement).
  • a predetermined range of the insulator for example, the opening of the first exterior part.
  • Such an arrangement may suppress movement of fluid such as gas from one direction of the insulator, but may not suppress movement of fluid such as gas from another direction of the insulator. Therefore, it is difficult to prevent fluids such as gas from flowing into the battery and leaking to the outside of the battery.
  • the additional member 80 is "circularly arranged around the opening and intermittently arranged" in the insulator 70, so that the additional member 80 is As shown in FIG. 4, an arrangement configuration in which the insulator 70 is provided at a local portion may be adopted. That is, in the present invention, the secondary battery 100 can also have a predetermined area of the insulator 70 where the additional member 80 is not provided. As described above, the insulator 70 may have the function of maintaining adhesion between the first exterior portion 40 and the second exterior portion 50. The predetermined region of the insulator 70 where the additional member 80 is not provided can better retain the adhesive function inherent to the insulator 70. Therefore, in the present invention, the adhesion between the first exterior part 40 and the second exterior part 50 can be suitably maintained.
  • the secondary battery 100 of the present invention can maintain adhesion between the first exterior part 40 and the second exterior part 50 while further suppressing fluid movement in the insulator 70. In other words, it is possible to both suppress fluid movement and ensure the adhesion retention function of the insulator.
  • the additional member 80 is "arranged circumferentially and intermittently with respect to the opening" in the insulator 70, so that the additional member 80 is provided at a local portion of the insulator 70. It is possible to adopt a different arrangement form. In other words, in the secondary battery 100 of the present invention, the additional member 80 may not be disposed over the entire insulator 70. In this regard, the amount of additional members 80 provided on the insulator 70 can be relatively smaller than that provided on the entire insulator 70. Even if the amount of the additional member 80 is relatively small, since the additional member 80 is "arranged in a circumferential manner and intermittently around the opening" of the insulator 70, as described above, the insulator Fluid movement within 70 may be more restrained. In other words, the present invention effectively suppresses fluid movement in the insulator 70 by ⁇ arranging the additional member 80 in the insulator 70 in a circumferential manner and intermittently with respect to the opening.'' It is possible.
  • Fluid in this specification means liquid and/or gas.
  • the liquid that moves between the inside of the battery and the outside of the battery include moisture in the external environment and/or electrolyte within the battery.
  • gases that move between the inside of the battery and the outside of the battery include volatilized electrolyte inside the battery (that is, gaseous electrolyte) and/or water vapor and gas that are the result of evaporation of moisture in the external environment.
  • the electrolyte includes the electrolytes listed above in this specification.
  • the first sheath and/or the second sheath may be a metal sheath having a non-laminated configuration.
  • the exterior part is not a laminate member consisting of a metal sheet/fusion layer/protective layer.
  • the exterior part in the present invention may be different from the exterior part of a soft case type battery, which corresponds to a pouch made of a so-called laminate film.
  • a metal sheath having a non-laminated construction preferably has a single piece metal construction.
  • such a metal sheath may be a single member made of metal such as stainless steel (SUS) and/or aluminum.
  • the term “single metal member” here means that the exterior part does not have a so-called laminate structure, and in a narrow sense, it means that the exterior part is substantially made only of metal. It means that. Therefore, as long as the member is made substantially only of metal, the surface of the metal exterior portion may be subjected to an appropriate surface treatment. For example, in a cut surface obtained by cutting such a metal exterior part in its thickness direction, a single metal layer can be seen except for areas where surface treatment has been performed.
  • stainless steel in this specification refers to, for example, stainless steel defined in “JIS G 0203 Steel Terminology", and may be chromium or an alloy steel containing chromium and nickel.
  • the first exterior part and the second exterior part become an "exterior body" by being integrated with each other (for example, integrated by adhesion, welding, etc.).
  • the first exterior part in this specification may be a cup-shaped exterior part.
  • the "cup-shaped exterior part” has a side wall or side part corresponding to the body part and a main surface (in a typical embodiment, for example, a bottom part) that is continuous with the side wall or side part, and has a hollow part inside. It means a member in which .
  • An electrode assembly in which electrode constituent layers including a positive electrode, a negative electrode, and a separator are laminated can be housed or wrapped in the hollow portion.
  • the second exterior part in this specification may be a lid-like exterior part.
  • the "lid-shaped exterior part” in this specification means an exterior part provided on the cup-shaped exterior part.
  • the lid-shaped exterior part means a member provided to cover the opening of the cup-shaped exterior part.
  • the lid-shaped exterior portion may be, for example, a single member (typically a flat member) extending in the same plane.
  • the first exterior part and/or the second exterior part may also function as a terminal part.
  • terminal section refers to an output terminal of a secondary battery that is used for connection with an external device.
  • the term "insulator” refers to a member that is interposed between the first exterior part and the second exterior part and contributes to "insulation" between them. There are no particular restrictions on the type of insulator as long as it exhibits “insulating properties.” Preferably, the insulator has not only "insulating properties" but also "fusion properties".
  • the insulator may comprise a thermoplastic resin.
  • the insulator may comprise a polyolefin such as polyethylene and/or polypropylene. Viewed from another perspective, the insulator may include an adhesive component that exhibits insulation properties.
  • adhesives examples include acrylic adhesives such as acrylic ester copolymers, rubber adhesives such as natural rubber, silicone adhesives such as silicone rubber, urethane adhesives such as urethane resins, ⁇ - Olefin adhesive, ether adhesive, ethylene-vinyl acetate resin adhesive, epoxy resin adhesive, vinyl chloride resin adhesive, chloroprene rubber adhesive, cyanoacrylate adhesive, water-based polymer-isocyanate adhesive Adhesives, styrene-butadiene rubber adhesives, nitrile rubber adhesives, nitrocellulose adhesives, reactive hot melt adhesives, phenolic resin adhesives, modified silicone adhesives, polyamide resin adhesives, polyimide adhesives, polyurethane resin adhesives, polyolefin resin adhesives, polyvinyl acetate resin adhesives, polystyrene resin solvent adhesives, polyvinyl alcohol adhesives, polyvinylpyrrolidone resin adhesives, polyvinyl butyral resin adhesives , polybenzimidazole adhesive,
  • the insulator 70 may be provided so as to extend to the outer edge of the second exterior portion 50. That is, the outer edge of the second exterior portion 50 and the outer edge of the insulator 70 may be provided in a straight line. In other words, the outer surface of the insulator 70 and the outer surface of the second exterior part 50 may be flush with each other. Further, as shown in FIG. 3, the insulator 70 may be provided so as to extend to the edge of the opening 45 of the first exterior part 40. In other words, the inner surface forming the through hole 75 of the insulator 70 and the inner surface forming the opening 45 of the first exterior part 40 may be flush with each other. Note that, as can be seen from the form shown in FIG.
  • the insulator 70 may have a shape that follows each of the second exterior portion 50 and the first exterior portion 40. That is, the main surface of the insulator 70 and the main surface of the second exterior part 50 may have a mutually parallel arrangement relationship. The main surface of the insulator 70 and the main surface of the first exterior part 40 may have a mutually parallel arrangement relationship. The insulator 70 may have a constant thickness between the exterior part 50 on the lid and the first exterior part 40.
  • the thickness of the insulator may be, for example, 1 ⁇ m or more and 500 ⁇ m or less, preferably 5 ⁇ m or more and 300 ⁇ m or less. When the thickness of the insulator is within the above range, the effects of the present invention become more apparent.
  • the arrangement of the additional members in the insulator will be described in detail below.
  • the arrangement form of the additional member is not particularly limited as long as the additional member is "circularly arranged around the opening and disposed intermittently.”
  • the additional members 80 may be unevenly arranged on the insulator 70.
  • the additional members 80 may be unevenly arranged within the insulator 70.
  • the additional members 80 may be unevenly arranged on the surface of the insulator 70. That is, the additional member 80 may be placed only in a portion of the insulator 70.
  • “the additional member is unevenly distributed on the insulator” means that the additional member 80 is provided only at a predetermined location of the insulator 70, and the insulator 70 is not provided with the additional member 80. It means that there is a part.
  • the additional member being unevenly distributed in the insulator may mean that the additional member is not uniformly distributed throughout the insulator.
  • Examples of arrangement forms in which additional members are unevenly distributed include the following.
  • a region is formed in which the additional member 80 is provided proximal to the inner edge of the insulator 70, while a region other than the region proximal to the inner edge of the insulator 70 is formed.
  • An area where the additional member 80 is not provided may be formed in the area.
  • a region where the additional member 80 is provided on the proximal side with respect to the outer edge of the insulator 70 is formed, while a region other than the proximal side with respect to the outer edge of the insulator 70 is formed.
  • An area where the additional member 80 is not provided may be formed in the area.
  • the additional members 80 disposed on the insulator 70 may be disposed adjacent to each other.
  • the additional members 80 may be arranged close to each other.
  • each of the additional members 80 within the insulator 70 are spaced apart from each other, but in close proximity.
  • Such an arrangement can further reduce the movement of fluids such as gas between the inside of the battery and the outside of the battery.
  • each of the additional members 80 are arranged in contact with each other. Such an arrangement may further reduce the movement of fluids such as gases between the interior of the battery and the exterior of the battery.
  • a region where the additional member 80 is provided may be formed between the inner edge of the insulator 70 and the outer edge of the insulator 70.
  • a region where the additional member 80 is provided may be formed along both the inner edge of the insulator 70 and the outer edge of the insulator 70.
  • the additional members 80 are arranged adjacently so that they touch each other without any gaps, but these are only diagrams schematically illustrating the present invention, and the present invention does not adopt such an arrangement. Not limited.
  • the additional members 80 may be arranged without touching each other. Even in the arrangement shown in FIG. 4, since the additional members are disposed in a circular manner and intermittently, movement of fluid such as gas between the inside of the battery and the outside of the battery can be further reduced.
  • the insulator 70 may have a through hole 75.
  • the additional member 80 may surround the through hole 75 of the insulator 70, as shown in plan view in FIG. That is, the additional member 80 may be arranged to surround the through hole 75.
  • the additional members 80 are arranged relatively densely around the through hole 75 of the insulator 70, thereby further reducing the passage of fluid that can pass between the outside of the battery and the inside of the battery. Therefore, movement of fluid such as gas between the inside of the battery and the outside of the battery can be further reduced.
  • the insulator 70 having the through hole 75 has side surfaces on the inside of the insulator 70 and on the outside of the insulator 70 due to its shape.
  • the insulator 70 having the through hole has an inner surface 71 located on the inner edge side of the insulator 70 and an outer surface 72 located on the outer edge side of the insulator 70.
  • the inner surface 71 is a surface that forms the through hole 75 of the insulator 70 .
  • the outer surface 72 is a surface that defines the outer contour of the insulator 70.
  • the additional member 80 may be arranged along the contour of at least one of the outer surface 72 of the insulator 70 and the inner surface 71 of the insulator 70. In this case, the additional member 80 may be arranged on the contoured surface of at least one of the outer surface 72 of the insulator 70 and the inner surface 71 of the insulator 70 or in the insulator proximal to this contoured surface. It may be located locally.
  • the additional member 80 may be arranged as shown in FIG. In FIG. 6, additional member 80 is arranged along inner surface 71 of insulator 70. In FIG. In FIG. 6, since the shape formed by the inner surface 71 (that is, the shape of the through hole 75) is circular, the arrangement form of the additional member 80 is circular.
  • the additional member 80 can be arranged in accordance with the shape of the through hole 75.
  • the additional member 80 is provided along the inner surface 71, fluids such as the electrolyte and/or gas generated from the electrolyte are prevented from leaking from the inside of the battery to the outside of the battery via the insulator 70. It becomes easier to reduce. Therefore, the amount of electrolyte and the like inside the battery is less likely to decrease, making it easier to maintain battery performance.
  • the additional member 80 is provided along the contour of the inner surface 71, it becomes difficult for the insulator 70 to come into contact with a fluid such as an electrolyte and/or a gas generated from the electrolyte, resulting in deterioration of the insulator 70. It becomes easier to suppress things. Such suppression of deterioration makes it easier to maintain the adhesive function of the insulator 70 between the first exterior part 40 and the second exterior part 50. Thereby, separation of the first exterior part 40 and the second exterior part 50 can be suitably suppressed.
  • the additional member 80 may be arranged as shown in FIG. In FIG. 7, an additional member 80 is disposed along the outer surface 72 of the insulator 70. In FIG. In FIG. 7, since the shape formed by the outer surface 72 (that is, the outer contour of the insulator 70) is circular, the arrangement form of the additional member 80 is circular.
  • the additional member 80 can be arranged in a manner that corresponds to the shape of the outer contour of the insulator 70.
  • the additional member 80 is provided along the contour of the outer surface 72, it becomes difficult for the insulator 70 to come into contact with a fluid such as a gas (e.g. water vapor) from the outside. It becomes easier to suppress deterioration caused by gas.
  • a fluid such as a gas (e.g. water vapor) from the outside.
  • gas e.g. water vapor
  • Such suppression of deterioration makes it easier for the insulator 70 to maintain the function of bonding the first exterior part 40 and the second exterior part 50, and the first exterior part 40 and the second exterior part 50 are bonded together. Separation can be suitably suppressed.
  • the additional member 80 may be provided at a predetermined distance from the outer surface 72 of the insulator 70 in order to prevent fluid such as gas from entering the battery from the outside through the insulator 70. Specifically, the explanation will be made using the cross-sectional view of FIG. 5 and the distance L from the inner surface 71 to the outer surface 72 of the insulator 70. They may be arranged at a distance of 0.3L, preferably at a distance of 0.3L.
  • the additional member 80 may be provided at a location a predetermined distance away from the inner surface 71 of the insulator 70. Specifically, when explaining using the cross-sectional view of FIG. 5 and the distance L from the inner surface 71 to the outer surface 72 of the insulator 70, the additional member 80 is separated from the inner surface 71 of the insulator 70 by a distance of 0.5L. They may be arranged at a distance of 0.3L, preferably at a distance of 0.3L.
  • the sealing length w of the additional member is smaller than the distance L from the inner surface 71 to the outer surface 72 of the insulator 70.
  • the sealing length w of the additional member is , 0.001L ⁇ W ⁇ 0.5L, preferably about 0.001L ⁇ W ⁇ 0.3L, or 0.001L ⁇ W ⁇ 0.1L.
  • the additional members can take various configurations in the insulator.
  • one of the additional members arranged on the insulator is taken as a starting point, and the additional member is arranged so as to go around a predetermined part (for example, a through hole) of the insulator from that starting point, and finally It suffices if the arrangement is such that it returns to the additional member taken as the starting point.
  • the arrangement of the additional members may be circular or annular as shown in FIGS. 6 to 8.
  • the arrangement structure may be rectangular, polygonal, elliptical, or irregular. In one embodiment of the present invention, a plurality of these arrangement forms may be provided.
  • the area occupied by the additional member with respect to the entire insulator provided with the additional member is, for example, 0.05% by volume or more and 30% by volume or less, more preferably 0.05% by volume with respect to the entire insulator provided with the additional member. It may be more than 10% by volume. If the area occupied by the additional member with respect to the entire insulator provided with the additional member is within the above range, fluid movement between the inside of the battery and the outside of the battery via the insulator can be further suppressed, and the adhesiveness of the insulator can be further improved. It becomes easier to play properly. In other words, performance with a better balance between the two can be achieved.
  • the additional member may reduce fluid movement between the exterior of the battery and the interior of the battery via the insulation.
  • the additional member may block a passage through which a fluid, such as a gas, may travel through the insulation.
  • the additional member may seal or block a path through which a fluid, such as a gas, may travel through the insulation.
  • the additional member may also be referred to as a fluid movement suppressing member, a fluid movement sealing member, or a fluid movement blocking member between the outside of the battery and the inside of the battery.
  • the additional member is a gas for suppressing the gas movement between the inside of the battery and the outside of the battery. It may be a sealing member.
  • the second exterior portion 50 can function as an external terminal (terminal portion) that takes out electricity to the outside.
  • the additional member may be included in the insulator or disposed on the insulator. These will be explained in detail below.
  • an additional member is provided within the insulator. That is, an additional member exists inside the insulator.
  • the additional member 80 can be arranged to partition the insulator 70 into an inner region and an outer region of the circumferential shape of the additional member 80. That is, as shown in the plan view of FIG. 8, a region located relatively inside (that is, on the inner edge side) of the insulator 70 and a region located relatively outside (that is, on the inner edge side) with the circumferential shape formed by the arrangement of the additional member 80 as a boundary.
  • the insulator 70 can be divided into a region located on the outer edge side).
  • the additional member can maintain the function of bonding the first exterior part and the second exterior part made of an insulator while suppressing the movement of fluid such as gas. In other words, it is possible to balance suppression of fluid movement such as gas and adhesive function.
  • the additional member may be composed of a filler.
  • the additional member may be made of filler alone, or may contain other members other than filler.
  • an organic material and/or an inorganic material described in detail below may be used as the filler, and a filler having both electrical insulation and gas sealing properties may be used.
  • the additional member may be composed of a plurality of fillers arranged densely.
  • “Multiple fillers arranged densely” means, for example, fillers arranged intensively at a predetermined location. In other words, it means a filler region formed by arranging a plurality of fillers at a predetermined location so as to be close to each other or adjacent to each other and in contact with each other.
  • the shape of the filler may be, for example, spherical, granular, acicular, plate-like, fibrous, and/or amorphous.
  • the shape of the additional member may be spherical in view of reducing the movement of fluid between the inside and outside of the cell.
  • the shape of the additional member is spherical, it becomes easier to make the thickness of the insulator including the additional member after crimping more uniform.
  • the insulating material including the spherical additional member has a point contact at the adhesive interface, it is easy to improve the fluid sealing property while maintaining the adhesive strength.
  • the additional member may be placed and formed during the production of the insulator. For example, this may be achieved by embedding the additional member in an insulator raw material (for example, softened resin, liquid resin, etc.) molded into a predetermined shape.
  • an insulator raw material for example, softened resin, liquid resin, etc.
  • an additional member is provided on the insulator. That is, the additional member is provided on the surface of the insulator, and the additional member is exposed to the outside of the insulator.
  • the surface of the insulator on which the additional member is provided may be, for example, at least one of the inner and outer surfaces of the insulator.
  • "Providing an additional member on at least one of the inner and outer surfaces of the insulator” may mean covering the inner and/or outer surfaces of the insulator with the additional member.
  • a covering member such as a tape-shaped member or a coating member may be used as the additional member.
  • the additional members may be disposed at least intermittently, and may also be disposed continuously.
  • the additional member 80 may be applied to cover the outer surface 72 of the insulator 70.
  • the outer surface 72 of the insulator 70 can be shielded from gases such as moisture present outside. In other words, it becomes easier to prevent gas such as moisture from entering the insulator 70 from the outside. Furthermore, by making it easier to prevent gas such as moisture from entering the insulator 70 from outside, it also becomes easier to reduce the possibility that the insulator 70 will come into contact with gas such as moisture and deteriorate. Therefore, problems such as the adhesive force of the insulator 70 being reduced due to deterioration of the insulator 70 and the insulator 70 being peeled off from the first and second exterior parts can be easily reduced.
  • an additional member 80 may be applied to cover the inner surface 71 of the insulator 70.
  • the inner surface 71 of the insulator 70 is present inside the battery. It can be isolated from gases such as electrolytes. In other words, it is easy to prevent gas such as the volatilized electrolyte inside the battery from entering the insulator 70. Therefore, it is easy to reduce problems such as gas such as the volatilized electrolyte invading the insulator 70, resulting in a decrease in the amount of the electrolyte 20 and deterioration of battery performance.
  • the possibility that the insulator 70 will deteriorate due to gas such as a volatilized electrolytic solution entering the insulator 70 can be easily reduced. Therefore, the adhesive force of the insulator 70 is reduced due to deterioration of the insulator 70, and problems such as the insulator 70 being peeled off from the first and second exterior parts are easily reduced.
  • the additional member may be coated on the insulator after the first exterior part is covered with the second exterior part.
  • an insulator may be coated with an additional member in advance.
  • One embodiment of the present invention can provide a secondary battery that copes with the movement of fluid such as gas between the inside of the battery and the outside of the battery by having the features described above.
  • movement of fluid between the inside of the battery and the outside of the battery is reduced.
  • the additional members are laid out in a circular manner to form a ring with an outer diameter of 5.00 mm and an inner diameter of 4.95 mm (see the plan view and partially enlarged view of Fig. 11), the cross-sectional area of the circumferential portion is 79 mm. % can be sealed with the additional member, and the gas sealing property is improved by 79%.
  • the thickness of the additional member may be, for example, 1 ⁇ m or more and 500 ⁇ m or less, preferably 5 ⁇ m or more and 300 ⁇ m or less.
  • the thickness of the additional member is within the above range, the effects of the present invention become more apparent.
  • the "thickness of the additional member” refers to the thickness of the main surface of the first exterior part 40 sandwiching the insulator 70 and the second exterior part in a cross-sectional view, as shown in FIG. It means the maximum length of the additional member 80 in a straight line direction perpendicular to the main surface of the portion 50.
  • the width of the additional member may be, for example, 1 ⁇ m or more and 500 ⁇ m or less, preferably 5 ⁇ m or more. It may be 300 ⁇ m or less.
  • the width of the additional member is within the above range, the effects of the present invention become more apparent.
  • the “width of the additional member” refers to the width between the main surface of the first exterior portion 40 holding the insulator 70 and the second It means the maximum length of the additional member 80 in a straight line direction perpendicular to the main surface of the exterior part 50.
  • the thickness or width of the additional member and the thickness of the insulator may be substantially the same.
  • the thickness T 1 of the additional member and the thickness T 2 of the insulator may be substantially the same as shown in FIG. 5 .
  • the width T 3 of the additional member and the width T 2 of the insulator may be substantially the same.
  • the thickness of the additional member and the thickness of the insulator are approximately the same, which is also a result of the manufacturing method of the secondary battery.
  • crimping using a press or the like is used to further increase the adhesive strength. It can be done.
  • the "thickness of the additional member" and the “thickness of the insulator” in the insulator provided with the additional member may be significantly different.
  • the insulator is also the "base material" of the additional member, the insulator, which is present in a larger amount than the additional member, is relatively more likely to be expanded and compressed. That is, during the crimping process, the insulator can be crushed more than the additional member. In other words, the thickness of the insulator can be reduced relatively more than the additional member. As the crimping of the insulator provided with the additional member progresses, the thickness of the insulator in the “base material portion” approaches the thickness of the additional member, and eventually the “thickness of the additional member” and the “insulator thickness” after crimping progress. The thickness of "thickness" can be substantially the same.
  • the additional member has relatively higher rigidity than the insulator, the thickness of the insulator after crimping can be approximated to the "thickness of the additional member".
  • the additional member by providing the additional member on the insulator, it becomes easier to control the degree to which the "thickness of the insulator" is reduced (that is, the amount of crushing of the insulator) during the crimping process.
  • the "thickness of the additional member” may be the thickness of an aggregate formed by a plurality of additional members, or may be the thickness of the member itself forming the aggregate.
  • the "thickness of the additional member” may be the diameter of one particle constituting the filler, or may be the thickness of an aggregate formed by a plurality of particles constituting the filler.
  • the additional member may be arranged perpendicular to the width direction of the insulator.
  • the width direction of the insulator means the direction in which the main surface of the insulator extends.
  • the additional member may be arranged parallel to the thickness direction of the insulator.
  • Thiickness direction of the insulator means a direction indicating the vertical distance between one main surface of the insulator and the other main surface of the insulator.
  • the additional member may be made of a material with low fluid permeability.
  • the additional member may be made of a material with low gas permeability and/or a material with low liquid permeability.
  • a material with low gas permeability means, for example, a material through which gas (that is, gas) is difficult to permeate.
  • a material with low liquid permeability means, for example, a material into which liquid is difficult to penetrate.
  • a material with low fluid permeability means that fluids such as gases from the external environment may flow into the battery, or fluids such as gases inside the battery may leak to the outside of the battery, resulting in deterioration of characteristics that are disadvantageous to the battery. It means a material that has a degree of permeability that does not cause
  • the additional member has lower fluid permeability than the insulator.
  • the gas permeability is lower than that of the insulator.
  • the amount of gas permeation is smaller than that of the insulator.
  • the additional member may be made of a material that is difficult to transmit water vapor.
  • a material that is difficult to permeate water vapor means a material that has a water vapor permeability of less than 1.0 g/(m 2 ⁇ Day).
  • the additional member may preferably have a water vapor permeability of 0 or more and less than 5 ⁇ 10 ⁇ 3 g/(m 2 ⁇ Day).
  • the "water vapor permeability" referred to in this specification refers to the transmittance obtained by the MA method using a gas permeability measuring device manufactured by MORESCO, model WG-15S, under measurement conditions of 85° C. and 85% RH. is pointing to.
  • the additional member has insulation properties (that is, electrical insulation properties).
  • insulation properties that is, electrical insulation properties.
  • degree of insulation that the additional member has, as long as it exhibits general "insulation”.
  • the additional member provided on the insulator suppresses the movement of fluid within the insulator and insulates the first and second exterior parts
  • the additional member has a structure that has both a small amount of fluid permeation and an insulating property. It is preferable to have.
  • the material used for the additional member is not particularly limited as long as it has low fluid permeability and/or insulation properties.
  • the additional member may be comprised of inorganic materials, organic materials, and mixtures thereof.
  • the inorganic material used for the additional member for example, metal oxides, silicon oxides, inorganic salts, and/or metal nitrides may be used.
  • the additional member may be made of titanium oxide, alumina, ferrite, ceramics, silica, or the like.
  • the organic material used for the additional member may be, for example, a material containing a resin component.
  • the additional member may include a thermoplastic resin component and/or a thermosetting resin component. That is, the organic material may be a thermoplastic resin and/or a thermosetting resin.
  • thermoplastic resin component is selected from the group consisting of, for example, polyphenylene sulfide, polyamide, polyamideimide, polyarylate, polysulfone, polyethersulfone, polyetheretherketone, polyetherimide, liquid crystal polymer, and thermoplastic polyimide. At least one kind may be used.
  • thermosetting resin component for example, at least one selected from the group consisting of epoxy resin, silicone resin, fluororesin, urea resin, melamine resin, polyimide, polyurethane resin, and diallyl phthalate resin may be used. .
  • a secondary battery according to an embodiment of the present invention can be used in various fields where power storage is expected. Although this is just an example, the secondary battery of the present invention can be used in the electrical, information, and communication fields where electrical and electronic devices are used (e.g., mobile phones, smartphones, notebook computers, digital cameras, activity meters, arm computers, etc.).
  • electrical and electronic devices e.g., mobile phones, smartphones, notebook computers, digital cameras, activity meters, arm computers, etc.
  • household and small industrial applications e.g., power tools, golf carts, household/nursing care/industrial robots), large industrial applications (e.g., forklifts, elevators, harbor cranes), transportation systems (e.g., hybrid vehicles, electric vehicles, buses, trains, electric assist) Bicycles, electric motorcycles, etc.), power system applications (e.g., various power generation, road conditioners, smart grids, home-installed power storage systems, etc.), medical applications (medical equipment such as earphones and hearing aids), and pharmaceutical applications. (in the field of medication management systems, etc.), as well as in the IoT field, and space/deep sea applications (for example, in the fields of space probes, underwater research vessels, etc.).
  • household and small industrial applications e.g., power tools, golf carts, household/nursing care/industrial robots
  • large industrial applications e.g., forklifts, elevators, harbor cranes
  • transportation systems e.g., hybrid vehicles, electric vehicles, buses, trains
  • Electrode composition layer 10 10' Electrode assembly 20 Electrolyte 40, 40' First exterior part 41 Outer surface of first exterior part 45, 45' Opening of first exterior part 50, 50' Second exterior part 60, 60' Terminal part 70, 70' Insulator 71 Inner surface of insulator 72 Outer surface of insulator 75 Through hole of insulator 80 Additional member 90 Fluid flow 100, 100' Secondary battery T 1 Thickness of additional member T 2 Thickness of insulator T 3 Width of insulator w Sealing length of additional member L Distance from outer surface to inner surface

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Composite Materials (AREA)
  • Materials Engineering (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
PCT/JP2023/005726 2022-03-17 2023-02-17 二次電池 Ceased WO2023176311A1 (ja)

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Citations (4)

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Publication number Priority date Publication date Assignee Title
JP2007095653A (ja) * 2005-09-05 2007-04-12 Nissan Motor Co Ltd バイポーラ電池、およびバイポーラ電池の製造方法
JP2007227366A (ja) * 2006-01-26 2007-09-06 Matsushita Electric Ind Co Ltd コイン形電気化学セル
WO2021221018A1 (ja) * 2020-04-30 2021-11-04 株式会社村田製作所 二次電池
WO2021229846A1 (ja) * 2020-05-14 2021-11-18 株式会社村田製作所 二次電池

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Publication number Priority date Publication date Assignee Title
JPS58131560U (ja) * 1982-03-02 1983-09-05 シチズン時計株式会社 扁平形電池のシ−ル構造

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007095653A (ja) * 2005-09-05 2007-04-12 Nissan Motor Co Ltd バイポーラ電池、およびバイポーラ電池の製造方法
JP2007227366A (ja) * 2006-01-26 2007-09-06 Matsushita Electric Ind Co Ltd コイン形電気化学セル
WO2021221018A1 (ja) * 2020-04-30 2021-11-04 株式会社村田製作所 二次電池
WO2021229846A1 (ja) * 2020-05-14 2021-11-18 株式会社村田製作所 二次電池

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