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WO2018155210A1 - Batterie secondaire et procédé de production de batterie secondaire - Google Patents

Batterie secondaire et procédé de production de batterie secondaire Download PDF

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Publication number
WO2018155210A1
WO2018155210A1 PCT/JP2018/004397 JP2018004397W WO2018155210A1 WO 2018155210 A1 WO2018155210 A1 WO 2018155210A1 JP 2018004397 W JP2018004397 W JP 2018004397W WO 2018155210 A1 WO2018155210 A1 WO 2018155210A1
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WIPO (PCT)
Prior art keywords
tab
electrode
negative electrode
positive electrode
current collector
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PCT/JP2018/004397
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English (en)
Japanese (ja)
Inventor
徹 川合
大塚　正博
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株式会社村田製作所
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Publication of WO2018155210A1 publication Critical patent/WO2018155210A1/fr

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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
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/528—Fixed electrical connections, i.e. not intended for disconnection
    • 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
    • H01M10/052—Li-accumulators
    • 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
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/139—Processes of manufacture
    • 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
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/534—Electrode connections inside a battery casing characterised by the material of the leads or tabs
    • 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 secondary battery and a method for manufacturing the secondary battery.
  • Secondary batteries that can be repeatedly charged and discharged have been used for various purposes.
  • the secondary battery is used as a power source for electronic devices such as smartphones and notebook computers.
  • Patent Document 1 discloses a secondary battery having a notched region in plan view.
  • Patent Document 1 discloses that an electrode assembly that is a constituent element of a secondary battery has a planar laminated structure in which a plurality of electrode units including a positive electrode, a negative electrode, and a separator are laminated in a planar shape.
  • a substrate or the like may be arranged in the notch region from the viewpoint of efficient installation of the substrate or the like.
  • the external terminal includes, for example, a lead portion and a lead formed by bundling each lead tab of each of a plurality of electrodes (positive electrode and / or negative electrode). Electrically connected.
  • the lead-out tab of each electrode needs to be opposed to the external terminal positioned in the notch region in plan view. That is, it is necessary to position the extraction tab of each electrode in the notch region in plan view.
  • a step of preparing a metal foil 11 ′ (current collector) (see FIG. 12 (i))
  • an electrode material layer 12 ′ is applied over the metal foil 11 ′.
  • a step (see FIG. 12 (ii)), an electrode having an extraction tab precursor 20 ⁇ ′ in the cutout region 30 ′ by punching (see FIG. 12 (iii)), and an extraction tab precursor 20 ⁇ ′ (see FIG.
  • the electrode 10 ′ having the extraction tab 20 ′ is formed in the notch region 30 ′ (see FIG. 12 (v)).
  • the electrode material layer 12 ′ is not formed on the extraction tab 20 ′.
  • the electrode material is provided only at the location where the extraction tab 20 ′ is provided. It is difficult to adjust so that the layer is not applied locally.
  • an object of the present invention is to provide a secondary battery including an electrode assembly having a notched region capable of suppressing a decrease in production efficiency and a method for manufacturing the same.
  • An electrode assembly including a positive electrode, a negative electrode, and a separator disposed between the positive electrode and the negative electrode, and an electrolyte, and a secondary battery in which an electrolyte is housed
  • the electrode assembly has a planar laminated structure in which a plurality of electrode units including a positive electrode, a negative electrode, and a separator are laminated in a planar shape, and has a notch region in plan view, At least one of some positive electrodes of the plurality of positive electrodes and some of the negative electrodes of the plurality of negative electrodes has a drawer tab and a connection tab,
  • the drawer tab is positioned in a notch region in plan view
  • the connection tab is positioned in a region other than the notch region in plan view.
  • the electrode assembly has a planar laminated structure in which a plurality of electrode units including a positive electrode, a negative electrode, and a separator are laminated in a planar shape, Forming at least one of a part of positive electrodes having a lead tab and a connection tab of the plurality of positive electrodes and a part of negative electrodes having a lead tab and a connection tab of the plurality of negative electrodes;
  • a manufacturing method is provided in which the drawer tab is positioned in the cutout region and the connection tab is positioned in a region other than the cutout region.
  • an electrode assembly having a notched region in which a decrease in production efficiency is suppressed.
  • FIG. 1 is a schematic view of an electrode assembly with a notched region that includes an electrode having a drawer tab and a connection tab.
  • FIG. 2 is a schematic view of an electrode assembly including an electrode having a drawer tab and a connection tab, and an electrode having only a connection tab.
  • FIG. 3 is a perspective view schematically showing an electrode including an uncoated part extending in one direction so as to expose the drawer tab and the main part of the current collector in plan view.
  • FIG. 4 is a perspective view schematically showing an electrode including an uncoated portion extending in one direction so that the drawer tab and the connection tab face each other across the main portion of the current collector in a plan view.
  • FIG. 5 is an exploded perspective view schematically showing a positive electrode and a negative electrode each having an uncoated portion facing each other.
  • FIG. 6 is an exploded perspective view schematically showing an aspect in which an uncoated portion of the negative electrode and an insulating member provided for the positive electrode face each other.
  • FIG. 7 is a schematic view showing a method for manufacturing an electrode assembly having a notch region.
  • FIG. 8 is a schematic diagram of a process for forming an electrode having a drawer tab and a connection tab.
  • FIG. 9A is a schematic diagram showing a method for manufacturing an electrode assembly including an electrode including an uncoated portion extending in one direction so as to expose the drawer tab and the main portion of the current collector in a plan view. is there.
  • FIG. 10 shows an electrode assembly including an electrode including an uncoated portion that extends in one direction so that a drawer tab and a connection tab face each other across a main portion of a current collector in a plan view. It is a schematic diagram which shows a manufacturing method.
  • FIG. 10A is a schematic diagram illustrating a method for forming an electrode having an uncoated portion.
  • FIG. 10B is a schematic view showing another method of forming an electrode having an uncoated portion.
  • FIG. 10C is a schematic view showing still another method of forming an electrode having an uncoated portion.
  • FIG. 10D is a schematic view showing still another method of forming an electrode having an uncoated portion.
  • FIG. 11 is a cross-sectional view schematically showing a specific configuration of the electrode assembly.
  • FIG. 12 is a schematic diagram showing the technical problem found by the inventors.
  • the term “secondary battery” in this specification refers to a battery that can be repeatedly charged and discharged.
  • the “secondary battery” is not excessively bound by the name, and may include, for example, “electric storage device”.
  • the “plan view” in the present specification refers to a state when the object is viewed from the upper side or the lower side along the thickness direction based on the stacking direction of the electrode materials constituting the secondary battery.
  • the “cross-sectional view” as used in this specification refers to a state when viewed from a direction substantially perpendicular to the thickness direction based on the stacking direction of the electrode materials constituting the secondary battery.
  • the secondary battery has a structure in which an electrode assembly and an electrolyte are accommodated and enclosed in an exterior body.
  • the electrode assembly includes a positive electrode, a negative electrode, and a separator disposed between the positive electrode and the negative electrode.
  • the electrode assembly has a planar laminated structure in which a plurality of electrode constituent layers including a positive electrode, a negative electrode, and a separator are laminated.
  • the exterior body may take the form of a conductive hard case or a flexible case (such as a pouch). When the form of the exterior body is a flexible case (such as a pouch), each of the plurality of positive electrodes is connected to the positive electrode external terminal via the positive electrode current collecting lead.
  • the external terminal for positive electrode is fixed to the exterior body by a seal portion, and the seal portion prevents electrolyte leakage.
  • each of the plurality of negative electrodes is connected to a negative electrode external terminal via a negative electrode current collecting lead.
  • the external terminal for negative electrode is fixed to the exterior body by a seal portion, and the seal portion prevents electrolyte leakage.
  • the present invention is not limited thereto, and the positive electrode current collector lead connected to each of the plurality of positive electrodes may have the function of a positive electrode external terminal, and the negative electrode current collector connected to each of the plurality of negative electrodes.
  • the lead may have a function of an external terminal for negative electrode.
  • each of the plurality of positive electrodes is connected to a positive electrode external terminal via a positive electrode current collecting lead.
  • the external terminal for positive electrode is fixed to the exterior body by a seal portion, and the seal portion prevents electrolyte leakage.
  • the positive electrode 10A is composed of at least a positive electrode current collector 11A and a positive electrode material layer 12A (see FIG. 11), and a positive electrode material layer 12A is provided on at least one side of the positive electrode current collector 11A.
  • a positive electrode side extraction tab 20A is positioned at a position where the positive electrode material layer 12A is not provided in the positive electrode current collector 11A, that is, at an end of the positive electrode current collector 11A.
  • the positive electrode material layer 12A contains a positive electrode active material as an electrode active material.
  • the negative electrode 10B includes at least a negative electrode current collector 11B and a negative electrode material layer 12B (see FIG. 11), and a negative electrode material layer 12B is provided on at least one surface of the negative electrode current collector 11B.
  • a negative electrode side extraction tab 20B is positioned at a position where the negative electrode material layer 12B is not provided in the negative electrode current collector 11B, that is, at an end of the negative electrode current collector 11B.
  • the negative electrode material layer 12B contains a negative electrode active material as an electrode active material.
  • the positive electrode active material contained in the positive electrode material layer 12A and the negative electrode active material contained in the negative electrode material layer 12B are materials directly involved in the transfer of electrons in the secondary battery, and are the main positive and negative electrodes responsible for charge / discharge, that is, the battery reaction. It is a substance. More specifically, ions are brought into the electrolyte due to “the positive electrode active material contained in the positive electrode material layer 12A” and “the negative electrode active material contained in the negative electrode material layer 12B”, and these ions are converted into the positive electrode 10A and the negative electrode. 10B is transferred to and delivered from 10B, and charging / discharging is performed.
  • the positive electrode material layer 12A and the negative electrode material layer 12B are particularly preferably layers that can occlude and release lithium ions.
  • a secondary battery in which lithium ions move between the positive electrode 10A and the negative electrode 10B through the electrolyte and the battery is charged and discharged is preferable.
  • the secondary battery corresponds to a so-called “lithium ion battery”.
  • the positive electrode active material of the positive electrode material layer 12A is made of, for example, a granular material, and a binder (also referred to as a “binder”) is included in the positive electrode material layer 12A in order to sufficiently contact the particles and maintain the shape. It is preferable. Further, a conductive additive may be included in the positive electrode material layer 12A in order to facilitate the transmission of electrons that promote the battery reaction.
  • the negative electrode active material of the negative electrode material layer 12B is made of, for example, a granular material, and it is preferable that a binder is included for sufficient contact and shape retention between the particles, which facilitates the transfer of electrons that promote the battery reaction.
  • a conductive additive may be included in the negative electrode material layer 12B.
  • the positive electrode material layer 12A and the negative electrode material layer 12B can also be referred to as “positive electrode mixture layer” and “negative electrode mixture layer”, respectively.
  • the positive electrode active material is preferably a material that contributes to occlusion and release of lithium ions.
  • the positive electrode active material is preferably, for example, a lithium-containing composite oxide.
  • the positive electrode active material is preferably 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, such a lithium transition metal composite oxide is preferably included as a positive electrode active material in the positive electrode material layer 12A of the secondary battery.
  • the positive electrode active material may be lithium cobaltate, lithium nickelate, lithium manganate, lithium iron phosphate, or a part of those transition metals replaced with another metal. Although such a positive electrode active material may be included as a single species, two or more types may be included in combination.
  • the positive electrode active material contained in the positive electrode material layer 12A is lithium cobalt oxide.
  • the binder that can be included in the positive electrode material layer 12A is not particularly limited, but poly (vinylidene fluoride), vinylidene fluoride-hexafluoropropylene copolymer, and vinylidene fluoride-tetrafluoroethylene copolymer. And at least one selected from the group consisting of polytetrafluoroethylene and the like.
  • the conductive aid that can be included in the positive electrode material layer 12A is not particularly limited, but carbon black such as thermal black, furnace black, channel black, ketjen black, and acetylene black, graphite, carbon nanotube, and gas phase There may be mentioned at least one selected from carbon fibers such as grown carbon fibers, metal powders such as copper, nickel, aluminum and silver, and polyphenylene derivatives.
  • the binder of the positive electrode material layer 12A may be polyvinylidene fluoride.
  • the conductive support agent of 12 A of positive electrode material layers is carbon black.
  • the binder and conductive additive of the positive electrode material layer 12A may be a combination of polyvinylidene fluoride and carbon black.
  • the negative electrode active material is preferably a material that contributes to occlusion and release of lithium ions. From this point of view, the negative electrode active material is preferably, for example, various carbon materials, oxides, or lithium alloys.
  • Examples of various carbon materials of the negative electrode active material include graphite (natural graphite, artificial graphite), hard carbon, soft carbon, diamond-like carbon, and the like. In particular, graphite is preferable because it has high electron conductivity and excellent adhesion to the negative electrode current collector 11B.
  • Examples of the oxide of the negative electrode active material include at least one selected from the group consisting of silicon oxide, tin oxide, indium oxide, zinc oxide, lithium oxide, and the like.
  • the lithium alloy of the negative electrode active material may be any metal that can be alloyed with lithium.
  • Al, Si, Pb, Sn, In, Bi, Ag, Ba, Ca, Hg, Pd, Pt, Te, Zn It may be a binary, ternary or higher alloy of a metal such as La and lithium.
  • Such an oxide is preferably amorphous in its structural form. This is because deterioration due to non-uniformity such as crystal grain boundaries or defects is less likely to be caused.
  • the negative electrode active material of the negative electrode material layer 12B may be artificial graphite.
  • the binder that can be included in the negative electrode material layer 12B is not particularly limited, but is at least one selected from the group consisting of styrene butadiene rubber, polyacrylic acid, polyvinylidene fluoride, polyimide resin, and polyamideimide resin. Species can be mentioned.
  • the binder contained in the negative electrode material layer 12B may be styrene butadiene rubber.
  • the conductive auxiliary agent that can be included in the negative electrode material layer 12B is not particularly limited, but carbon black such as thermal black, furnace black, channel black, ketjen black, and acetylene black, graphite, carbon nanotube, and gas phase There may be mentioned at least one selected from carbon fibers such as grown carbon fibers, metal powders such as copper, nickel, aluminum and silver, and polyphenylene derivatives.
  • the negative electrode material layer 12B may contain a component resulting from a thickener component (for example, carboxymethyl cellulose) used during battery manufacture.
  • the negative electrode active material and binder in the negative electrode material layer 12B may be a combination of artificial graphite and styrene butadiene rubber.
  • the positive electrode current collector 11A and the negative electrode current collector 11B used for the positive electrode 10A and the negative electrode 10B are members that contribute to collecting and supplying electrons generated in the active material due to the battery reaction.
  • a current collector may be a sheet-like metal member and may have a porous or perforated form.
  • the current collector may be a metal foil, a punching metal, a net or an expanded metal.
  • the positive electrode current collector 11A used for the positive electrode 10A is preferably made of a metal foil containing at least one selected from the group consisting of aluminum, stainless steel, nickel and the like, and may be, for example, an aluminum foil.
  • the negative electrode current collector 11B used in the negative electrode 10B is preferably made of a metal foil containing at least one selected from the group consisting of copper, stainless steel, nickel, and the like, and may be, for example, a copper foil.
  • the separator 50 used for the positive electrode 10 ⁇ / b> A and the negative electrode 10 ⁇ / b> B is a member provided from the viewpoints of preventing a short circuit due to contact between the positive and negative electrodes and holding the electrolyte.
  • the separator 50 can be said to be a member that allows ions to pass through while preventing electronic contact between the positive electrode 10A and the negative electrode 10B.
  • the separator 50 is a porous or microporous insulating member and has a film form due to its small thickness. Although only illustrative, a polyolefin microporous film may be used as the separator.
  • the microporous film used as the separator 50 may include, for example, only polyethylene (PE) or only polypropylene (PP) as the polyolefin.
  • the separator 50 may be a laminate composed of “PE microporous membrane” and “PP microporous membrane”.
  • the surface of the separator 50 may be covered with an inorganic particle coat layer and / or an adhesive layer.
  • the surface of the separator may have adhesiveness.
  • the separator 50 is not particularly restricted by its name, and may be a solid electrolyte, a gel electrolyte, insulating inorganic particles or the like having the same function.
  • the separator 50 and the electrode are bonded from the viewpoint of further improving the handling of the electrode.
  • the separator 50 is bonded to the electrode by using an adhesive separator as the separator 50, applying an adhesive binder on the electrode material layer (positive electrode material layer 12A / negative electrode material layer 12B) and / or thermocompression bonding, or the like. Can be done.
  • the adhesive that provides adhesiveness to the separator 50 or the electrode material layer include polyvinylidene fluoride and an acrylic adhesive.
  • the electrolyte is preferably a “non-aqueous” electrolyte such as an organic electrolyte and / or an organic solvent (that is, the electrolyte is a non-aqueous electrolyte).
  • the electrolyte metal ions released from the electrodes (the positive electrode 10A and the negative electrode 10B) are present, and therefore, the electrolyte assists the movement of the metal ions in the battery reaction.
  • a non-aqueous electrolyte is an electrolyte containing a solvent and a solute.
  • a solvent containing at least carbonate is preferable.
  • Such carbonates may be cyclic carbonates and / or chain 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.
  • chain carbonates include at least one selected from the group consisting of dimethyl carbonate (DMC), diethyl carbonate (DEC), ethyl methyl carbonate (EMC), and dipropyl carbonate (DPC).
  • DMC dimethyl carbonate
  • DEC diethyl carbonate
  • EMC ethyl methyl carbonate
  • DPC dipropyl carbonate
  • the combination of cyclic carbonate and chain carbonate is used as a nonaqueous electrolyte, for example, the mixture of ethylene carbonate and diethyl carbonate may be used.
  • a Li salt such as LiPF 6 or LiBF 4
  • a Li salt such as LiPF 6 and / or LiBF 4 is preferably used.
  • any current collecting lead used in the field of secondary batteries can be used.
  • a current collecting lead may be made of a material that can achieve electron movement, and is made of a conductive material such as aluminum, nickel, iron, copper, and stainless steel.
  • the positive electrode current collector lead is preferably composed of aluminum, and the negative electrode current collector lead is preferably composed of nickel.
  • the form of the positive electrode current collector lead and the negative electrode current collector lead is not particularly limited, and may be, for example, a wire or a plate.
  • any external terminal used in the field of secondary batteries can be used.
  • Such an external terminal may be made of a material capable of achieving electron movement, and is usually made of a conductive material such as aluminum, nickel, iron, copper, and stainless steel.
  • the external terminal 5 may be electrically and directly connected to the substrate, or may be electrically and indirectly connected to the substrate via another device.
  • the present invention is not limited to this, and the positive electrode current collector lead connected to each of the plurality of positive electrodes may have the function of the positive electrode external terminal, and the negative electrode current collector connected to each of the plurality of negative electrodes.
  • the lead may have a function of an external terminal for negative electrode.
  • the exterior body may have the form of a conductive hard case or a flexible case (such as a pouch) as described above.
  • the conductive hard case consists of a main body and a lid.
  • a main-body part consists of the bottom part and side part which comprise the bottom face of the said exterior body.
  • the main body and the lid are sealed after the electrode assembly, the electrolyte, the current collecting lead, and the external terminal are accommodated.
  • the sealing method is not particularly limited, and examples thereof include a laser irradiation method.
  • a material constituting the main body part and the lid part any material capable of constituting a hard case type exterior body in the field of secondary batteries can be used.
  • Such a material may be any material that can achieve electron transfer, and examples thereof include conductive materials such as aluminum, nickel, iron, copper, and stainless steel.
  • the dimensions of the main body and the lid are mainly determined according to the dimensions of the electrode assembly.
  • the dimensions are such that the electrode assembly is prevented from moving (displacement) within the exterior body. It is preferable to have. By preventing the movement of the electrode assembly, the electrode assembly is prevented from being destroyed, and the safety of the secondary battery is improved.
  • the flexible case is composed of a soft sheet.
  • the soft sheet only needs to have a degree of softness that can achieve bending of the seal portion, and is preferably a plastic sheet.
  • the plastic sheet is a sheet having a characteristic that the deformation due to the external force is maintained when the external sheet is applied and then removed.
  • a so-called laminate film can be used.
  • a flexible pouch made of a laminate film can be produced, for example, by laminating two laminate films and heat-sealing the peripheral edge.
  • the laminate film a film obtained by laminating a metal foil and a polymer film is generally used. Specifically, a film having a three-layer structure including an outer layer polymer film / metal foil / inner layer polymer film is exemplified.
  • the outer layer polymer film is for preventing damage to the metal foil due to permeation and contact of moisture and the like, and polymers such as polyamide and polyester can be suitably used.
  • the metal foil is for preventing the permeation of moisture and gas, and a foil of copper, aluminum, stainless steel or the like can be suitably used.
  • the inner layer polymer film is for protecting the metal foil from the electrolyte accommodated therein, and for melting and sealing at the time of heat sealing, and polyolefin or acid-modified polyolefin can be suitably used.
  • connection tab in the present specification refers to a member corresponding to an uncoated portion of the electrode (positive electrode / negative electrode) and not joined to the current collecting lead.
  • the “connecting portion” in the present specification refers to a member formed by bundling a plurality of connecting tabs into one.
  • the “drawer tab” referred to in the present specification is a portion corresponding to an uncoated portion of an electrode (positive electrode / negative electrode) and refers to a member bonded to a current collecting lead.
  • the “drawer portion” in the present specification refers to a member formed by bundling a plurality of drawer tabs into one.
  • the “notch region” in the present specification is a region where a part of the initial shape is intentionally lost.
  • the initial shape before the formation of the notch region is usually a rectangular shape.
  • the shape of the cutout region in plan view is not particularly limited, and examples thereof include a rectangular shape, a triangular shape, a fan shape, a semicircular shape, and a circular shape.
  • the inventors of the present application have the production efficiency of the electrode assembly having a planar laminated structure having the cutout region in plan view.
  • the inventors have intensively studied and came up with a secondary battery according to an embodiment of the present invention.
  • the inventors of the present application do not position all of the extraction tabs 20 ′ of the plurality of electrodes 10 ′ within the cutout region 30 ′, but instead of extraction tabs of some of the plurality of electrodes. It came to devise a new response to position only in the notch area. That is, the inventors of the present application have devised the present invention based on the technical idea of reducing the number of drawer tabs positioned in the cutout region as much as possible.
  • FIG. 1 is a schematic view of an electrode assembly having a notch region including an electrode having a drawer tab and a connection tab.
  • a secondary battery according to an embodiment of the present invention has a structure in which an electrode assembly 100 and an electrolyte are accommodated and enclosed in an exterior body.
  • the electrode assembly 100 has a planar laminated structure in which a plurality of electrode units including a positive electrode 10A, a negative electrode 10B, and a separator 50 are laminated in a planar shape, and has a cutout region 30 in plan view. It consists of
  • some of the electrodes 10X of the plurality of electrodes 10 are provided with the extraction tab 20 and the connection tab 40 in plan view.
  • the drawer tab 20 is positioned in the notch region 30 in plan view, while the connection tab 40 is positioned in a region other than the notch region 30 in plan view.
  • at least one of some of the positive electrodes 10A of the plurality of positive electrodes 10A and some of the negative electrodes 10B of the plurality of negative electrodes 10B is connected to the extraction tab 20 and the connection in a plan view. It has a tab. Note that it is preferable that some of the positive electrodes 10A of the plurality of positive electrodes 10A and some of the negative electrodes 10B of the plurality of negative electrodes 10B have the extraction tab 20 and the connection tab 40 in plan view.
  • the electrode 10 has a current collector 11 and an electrode material layer 12 provided on the current collector 11 as shown in FIG.
  • the electrode 10 used as the positive electrode 10A includes a positive electrode current collector 11A and a positive electrode material layer 12A provided on the positive electrode current collector 11A as shown in FIG.
  • the positive electrode material layer 12A is one of the positive electrode current collectors 11A from the viewpoint of eliminating the positive electrode material layer that does not directly contribute to the battery characteristics. It is preferable to be provided only on this side (one main surface side).
  • the positive electrode material layer 12A is preferably positioned between the positive electrode current collector 11A and the separator 50 from the viewpoint of eliminating the positive electrode material layer that does not directly contribute to the battery characteristics.
  • the negative electrode 10B positioned in the outermost layer region of the electrode assembly 100 the negative electrode material layer 12B is disposed on one side (one main electrode) of the negative electrode current collector 11B from the viewpoint of eliminating a negative electrode material layer that does not directly contribute to battery characteristics. It is preferable to be provided only on the surface side.
  • the negative electrode material layer 12B is preferably positioned between the negative electrode current collector 11B and the separator 50 from the viewpoint of eliminating a negative electrode material layer that does not directly contribute to battery characteristics.
  • a part of the electrodes 10X (the positive electrode 10A and / or the negative electrode 10B) of the plurality of electrodes 10X has the extraction tab 20 and the connection tab 40 in plan view.
  • all the extraction tabs of the plurality of electrodes 10 are not positioned within the cutout region 30, but the extraction tabs 20 of the “partial” electrodes 10X of the plurality of electrodes 10 are cut out. Located in the notch area 30.
  • the electrode material layer 12 is applied over the current collector 11 (metal foil), and the notch region having a predetermined shape is formed by punching.
  • the electrode material layer 12 in the extraction tab precursor (corresponding to the electrode material layer 12 coated on the extraction tab 20 formed later) is removed each time with a light beam or the like. There is no need. That is, when the extraction tabs 20 of the “partial” electrodes 10 ⁇ / b> X among the plurality of electrodes 10 are positioned in the cutout region 30, the “all” extraction tabs 20 of the plurality of electrodes 10 are in the cutout region 30.
  • the number of times the electrode material layer 12 is removed by a light beam or the like in the extraction tab precursor (corresponding to the electrode tab 12 coated on the extraction tab 20 formed later) during the production. Can be reduced.
  • the manufacturing time of the planar stacked structure electrode assembly 100 having the cutout region 30 in a plan view is relatively shortened. can do. That is, it is possible to suppress a reduction in production efficiency of the electrode assembly 100 having a planar stacked structure having the notch region 30. Therefore, it is possible to efficiently obtain a secondary battery finally having a notch region.
  • the drawer tab 20 positioned in the notch region 30 is configured to be electrically connectable to an external terminal.
  • the two or more extraction tabs 20 for each of the “partial” electrodes 10X of the plurality of electrodes 10 are bundled into one.
  • the drawn portion is configured to be electrically connectable to an external terminal through the current collecting lead.
  • the exterior body that houses the electrode assembly also has a cutout area in plan view from the viewpoint of reducing the dimensions of the exterior body as much as possible.
  • the external terminal facing the drawer tab 20 in the cutout region 30 is positioned so as to be exposed from the surface forming the cutout region of the exterior body in plan view.
  • the secondary battery according to an embodiment of the present invention preferably adopts the following aspects.
  • At least one of only one positive electrode 10A and only one negative electrode 10B has the extraction tab 20 in the cutout region 30 and the connection tab 40 in a region other than the cutout region 30 (FIG. 1).
  • only one electrode 10 (positive electrode 10A and / or negative electrode 10B) is connected to a region other than the extraction tab 20 and the notch region 30 in the notch region 30. It is preferable to have a tab 40. In other words, it is preferable that the extraction tab 20 “only” of one of the plurality of electrodes 10 is positioned in the cutout region 30.
  • each extraction tab 20 of the “partial” electrode 10 ⁇ / b> X of the plurality of electrodes 10 is Compared with the case where the electrode material layer 12 is positioned in the notch region 30, the electrode material layer 12 in the extraction tab precursor (corresponding to the electrode material layer 12 coated on the extraction tab 20 formed later) is light-transmitted during the production.
  • the number of times of removal by a beam or the like can be further reduced.
  • the electrode assembly 100 further includes at least one of a positive electrode 10A having only the connection tab 40 and a negative electrode 10B having only the connection tab 40, and the connection tab 40 is positioned in a region other than the notch region 30. Preferably it is.
  • FIG. 2 is a schematic view of an electrode assembly including an electrode having a drawer tab and a connection tab and an electrode having only a connection tab.
  • some of the electrodes 10X (the positive electrode 10A and / or the negative electrode 10B) have the extraction tab 20 and the cut tab 20 in the cutout region 30 in plan view. It is characterized by adopting a configuration having a connection tab 40 in an area other than the notch area 30. That is, the technical idea of the present invention is that only the extraction tabs 20 of some of the electrodes 10X among the plurality of electrodes 10 are positioned in the notch region 30. According to this technical idea, there is an electrode that does not have the extraction tab 20 in the cutout region 30 in plan view.
  • the electrode 10 ⁇ / b> Y that does not have the extraction tab 20 has a connection tab 40 (only), and the connection tab 40 is positioned in a region other than the notch region 30.
  • the electrode 10X having the extraction tab 20 and the connection tab 40 and the electrode 10Y having only the connection tab 40 can be electrically connected to each other by bundling the connection tabs 40 together to form a connection portion. It becomes.
  • the electrode assembly 100 including the electrode 10X including the extraction tab 20 and the electrode 10Y not including the extraction tab 20 can be electrically connected as a whole. That is, in the electrode assembly 100, the electrode 10X having the extraction tab 20 and the connection tab 40 and the electrode 10Y having only the connection tab 40 are bundled together to form a connection portion. Can be electrically connected.
  • the plurality of electrodes 10 that are constituent elements of the electrode assembly 100 are divided into the electrode 10X having the extraction tab 20 and the connection tab 40 and the electrode 10Y having only the connection tab 40 along the stacking direction. It is characterized in that it is composed of combinations.
  • the plurality of positive electrodes 10A includes an electrode 10X (positive electrode) having the extraction tab 20 and the connection tab 40 and an electrode 10Y (positive electrode) having only the connection tab 40 along the stacking direction. )).
  • the plurality of negative electrodes 10B includes an electrode 10X (negative electrode) having the extraction tab 20 and the connection tab 40 and an electrode 10Y (negative electrode) having only the connection tab 40 along the stacking direction. )).
  • the electrode 10X 1 (positive electrode and / or negative electrode) having the extraction tab 20 and the connection tab 40 includes a coating portion 12 ⁇ in which an active material is applied to the current collector 11 in a cross-sectional view and the active material There is an uncoated portion 60 that is not locally applied, and the uncoated portion 60 extends in one direction so as to expose the drawer tab 20 and the main portion 11 ⁇ of the current collector in plan view.
  • the uncoated portion 60 extends in one direction so as to expose the drawer tab 20 and the main portion 11 ⁇ of the current collector in plan view.
  • the uncoated portion 60 Preferably present.
  • the “main part of the current collector” refers to a main part of the current collector in a broad sense, and a part in which an electrode material layer is formed on the upper surface in a narrow sense. It should be noted that the drawer tab 20 and the connection tab 40 form part of the current collector and are provided on the side of the main part of the current collector.
  • the “coating portion” here refers to a portion where an electrode material layer is coated on a current collector.
  • the “uncoated part” here refers to a part where the electrode material layer is not coated on the current collector. Therefore, the “uncoated part” may be referred to as a non-coated part.
  • FIG. 3 is a perspective view schematically showing an electrode including an uncoated portion extending in one direction so as to expose the extraction tab and the main portion of the current collector in plan view.
  • an embodiment of the present invention is characterized in that the extraction tab 20 of the “part” electrode 10X of the plurality of electrodes 10 is positioned in the notch region 30 (FIGS. 1 and 3). 2).
  • the extraction tab 20 is configured not to have an electrode material layer on its upper surface.
  • the electrode material layer in the extraction tab precursor (corresponding to the electrode material layer coated on the extraction tab 20 formed later) is light-transmitted during the production. It can be removed by a beam or the like.
  • the electrode material layer in the extraction tab precursor cannot be suitably removed by irradiation with a light beam or the like so that only the desired extraction tab 20 is exposed.
  • the part where the drawer tab 20 is installed and the main part 11 ⁇ of the current collector are exposed in one direction in plan view.
  • the extending uncoated portion 60 is intentionally formed between one coated portion 12 ⁇ and the other coated portion 12 ⁇ when the electrode material layer is coated on the current collector. That is, it is not necessary to remove the electrode material layer in the extraction tab precursor (corresponding to an electrode material layer coated on the extraction tab 20 to be formed later) during the production with a light beam or the like later. Therefore, it is possible to eliminate the possibility that the electrode material layer in the extraction tab precursor cannot be suitably removed by irradiation with a light beam or the like so that only the desired extraction tab 20 is exposed.
  • the drawer tab 20 and the connection tab 40 are opposed to each other across the main part 11 ⁇ of the current collector 11 in plan view. Is more preferable.
  • FIG. 4 is a perspective view schematically showing an electrode including an uncoated portion extending in one direction so that the drawer tab and the connection tab face each other across the main portion of the current collector in a plan view.
  • the drawer tab 20 and the connection tab 40 are opposed to each other across the main part 11 ⁇ of the current collector 11 in plan view in the uncoated part 60. That is, in the embodiment shown in FIG. 4, in the uncoated portion 60 extending in one direction as compared with the embodiment shown in FIG. 3, the drawer tab 20 is provided on one side of the main portion 11 ⁇ of the current collector 11 in a plan view. And the connection tab 40 is positioned on the other side of the main part 11 ⁇ of the current collector 11. In short, the undrawn portion 60 extending in one direction in a plan view is configured such that the drawer tab 20, the main portion 11 ⁇ of the current collector 11, and the connection tab 40 are exposed.
  • the electrode is composed of a combination of the electrode 10X having the extraction tab 20 and the connection tab 40 and the electrode 10Y having only the connection tab 40 (see FIG. 2). .
  • Both the electrode 10 ⁇ / b> X and the electrode 10 ⁇ / b> Y have a connection tab 40.
  • the connection tab 40 is configured not to have an electrode material layer on its upper surface.
  • the electrode material layer in the connection tab precursor (corresponding to the electrode material layer coated on the connection tab 40 formed later) is light-transmitted during manufacture. It can be removed by a beam or the like.
  • the connection tab 40 is located in a region other than the notch region 30, for example, as shown in FIGS.
  • connection tab 40 is provided at an arbitrary position on the side of the main part 11 ⁇ of the current collector 11 in a region other than the notch region 30, a drawer tab precursor (drawer tab 20 formed later) is manufactured during the manufacturing process.
  • the step of removing the electrode material layer in the electrode material layer coated on the upper surface) and the connection tab precursor (corresponding to the electrode material layer coated on the connection tab 40 formed later) It may be necessary to perform the step of removing the electrode material layer in) in a different time zone. That is, it is necessary to form the connection tab 40 in a process different from the process of forming the drawer tab 20, and it may not be said that the production efficiency of each tab is high.
  • the uncoated portion 60 extending in one direction in a plan view the portion where the drawer tab 20 is installed, the main part of the current collector 11
  • the uncoated portion 60 extending in one direction so as to expose the portion 11 ⁇ and the portion where the connection tab 40 is installed is intentionally placed between one coated portion 12 ⁇ and the other coated portion 12 ⁇ .
  • a step of removing the electrode material layer in the drawer tab precursor (corresponding to an electrode material layer coated on the drawer tab 20 formed later) during the manufacturing process, and a connection tab precursor (formed later) The step of removing the electrode material layer in the case where the electrode material layer is coated on the connection tab 40 is not required to be performed in a different time zone. Therefore, since it is not necessary to form the connection tab 40 in a separate process from the process of forming the drawer tab 20, it is possible to improve the production efficiency of each tab.
  • the uncoated portion 60B of the negative electrode 10B having the extraction tab 20B and the connection tab 40B and the uncoated portion 60A of the positive electrode 10A having the extraction tab 20A and the connection tab 40A are opposed to each other in a cross-sectional view. It is preferable that it is positioned so as to.
  • FIG. 5 is an exploded perspective view schematically showing a positive electrode and a negative electrode each having an uncoated portion facing each other.
  • the positive electrode 10A includes a drawer tab 20A positioned in the notch region 30A and a connection tab 40A positioned in a region other than the notch region 30A.
  • the positive electrode side extraction tab 20A is positioned on the side of the main portion 11A ⁇ of the positive electrode current collector 11A in the notch region 30A, and the positive electrode current collector 11A in the region other than the notch region 30A.
  • the positive electrode side connection tab 40A is positioned on the side portion of the main portion 11A ⁇ .
  • the positive electrode material layer 12A is coated on one side, while on the other side of the positive electrode current collector 11A, the positive electrode material layer 12A (corresponding to a coating portion) in plan view. Is coated on both sides of the uncoated portion 60A.
  • the uncoated part 60A of the positive electrode 10A extends in one direction so as to expose the positive electrode side extraction tab 20A and the main part 11A ⁇ of the positive electrode current collector 11A in plan view.
  • Uncoated portion 60A width W 1 of the on the main unit 11A ⁇ of the exposed positive electrode collector 11A is larger than the width dimension W 2 of the uncoated portion 60A in the cathode-side lead tab 20A on.
  • the difference between the width W 2 of the uncoated portion 60A on the width W 1 and the positive electrode side lead tab 20A of uncoated portion 60A on the main unit 11A ⁇ of the exposed positive electrode collector 11A is, It is substantially equal to the width W 3 of the uncoated portion 60B on the main unit 11B ⁇ of the negative electrode current collector 11B exposed to be described later.
  • the negative electrode 10B includes a negative electrode side extraction tab 20B positioned in the cutout region 30B and a connection tab 40B positioned in a region other than the cutout region 30B.
  • the negative electrode extraction tab 20B is positioned on the side of the main part 11B ⁇ of the negative electrode current collector 11B in the notch region 30B, and the negative electrode current collector 11B in the region other than the notch region 30B.
  • the negative electrode side connection tab 40B is positioned on the side portion of the main portion 11B ⁇ .
  • the negative electrode material layer 12B (corresponding to a coating part) is preferably coated on both sides of the uncoated part 60B in plan view only on one side of the negative electrode current collector 11B. From the viewpoint of preventing lithium from being deposited on the uncoated portion 60B of the negative electrode 10B when the positive electrode 10A and the negative electrode 10B are laminated via the separator 50, the positive electrode 10A is also uncoated with the negative electrode 10B as described above. It is preferable to provide an uncoated portion 60 ⁇ / b> A that is disposed facing the working portion 60 ⁇ / b> B along the stacking direction.
  • the uncoated portion 60A of the positive electrode 10A and the uncoated portion 60B of the negative electrode 10B face each other along the stacking direction. Preferably they are arranged.
  • the positive electrode 10A when the uncoated part 60B is formed on both sides (both main surface sides) of the negative electrode current collector 11B, from the viewpoint of preventing lithium from being deposited on the uncoated part 60B formed on both sides, the positive electrode 10A
  • the uncoated portion 60A needs to be disposed opposite to the uncoated portion 60B formed on both sides of the negative electrode current collector 11B. Therefore, from the viewpoint of reducing the number of formations of the uncoated part 60A of the positive electrode 10A, that is, from the viewpoint of improving the production efficiency of the positive electrode 10A having the uncoated part 60A, the negative electrode material layer 12B having the uncoated part 60B is a negative electrode collector. It is preferably formed only on one side (one main surface side) of the electric body 11B.
  • the positive electrode 10A having the drawer tab 20A and the connection tab 40A preferably includes an insulating member 70A positioned so as to face the uncoated portion 60B of the negative electrode 10B in a cross-sectional view.
  • FIG. 6 is an exploded perspective view schematically showing an aspect in which the uncoated portion of the negative electrode and the insulating member provided for the positive electrode face each other.
  • the positive electrode side extraction tab 20A is positioned on the side of the main part 11A ⁇ of the positive electrode current collector 11A in the notch area 30A as in the aspect shown in FIG. 5, and the areas other than the notch area 30A.
  • the positive electrode side connection tab 40A is positioned on the side of the main part 11A ⁇ of the positive electrode current collector 11A.
  • the positive electrode material layer 12A is coated on one side, while on the other side of the positive electrode current collector 11A, the positive electrode material layer 12A (corresponding to a coating portion) in plan view. Is coated on both sides of the uncoated portion 60A.
  • the uncoated part 60A of the positive electrode 10A extends in one direction so as to expose the positive electrode side extraction tab 20A and the main part 11A ⁇ of the positive electrode current collector 11A in plan view.
  • Uncoated portion 60A width W 1 of the on the main unit 11A ⁇ of the exposed positive electrode collector 11A is larger than the width dimension W 2 of the uncoated portion 60A in the cathode-side lead tab 20A on.
  • the negative electrode 10B is connected to the negative electrode side extraction tab 20B positioned in the cutout region 30B and the connection tab 40B positioned in a region other than the cutout region 30B, as in the embodiment shown in FIG. It has.
  • the negative electrode extraction tab 20B is positioned on the side of the main part 11B ⁇ of the negative electrode current collector 11B in the notch region 30B, and the negative electrode current collector 11B in the region other than the notch region 30B.
  • the negative electrode side connection tab 40B is positioned on the side portion of the main portion 11B ⁇ .
  • the insulating member 70A is provided on the main part 11A ⁇ of the current collector 11A of the positive electrode 10A or on the positive electrode material layer 12A.
  • the insulating member 70A is preferably positioned so as to face the uncoated portion 60B of the negative electrode 10B when the positive electrode 10A and the negative electrode 10B are stacked via the separator 50 as shown in FIG. With this positioning, it is possible to prevent lithium from being deposited on the uncoated portion 60B of the negative electrode 10B when the positive electrode 10A and the negative electrode 10B are stacked via the separator 50.
  • the width dimension (W 3 ) of the insulating member 70A and the uncoated portion 60B of the negative electrode 10B that are opposed to each other along the stacking direction is more substantially the same. preferable.
  • the negative electrode current collector 11B when the uncoated part 60B is formed on both sides (both main surface sides) of the negative electrode current collector 11B, from the viewpoint of preventing lithium from being deposited on the uncoated part 60B formed on both sides, the negative electrode current collector It is necessary to dispose the insulating members 70A so as to face the uncoated portions 60B formed on both sides of the electric body 11B. Therefore, from the viewpoint of reducing the number of times the insulating member 70A is provided, that is, from the viewpoint of improving the installation efficiency of the insulating member 70A, the negative electrode material layer 12B having the uncoated portion 60B is provided on one side (one of the negative electrode current collectors 11B) It is preferably formed only on the main surface side).
  • the inventors of the present application have the production efficiency of the electrode assembly having a planar laminated structure having the cutout region in plan view.
  • the inventors have intensively studied and came up with a method for manufacturing a secondary battery according to an embodiment of the present invention. Specifically, the inventors of the present application do not position all of the extraction tabs 20 ′ of the plurality of electrodes 10 ′ within the cutout region 30 ′, but instead of extraction tabs of some of the plurality of electrodes. It came to devise a new response to position only in the notch area. That is, the inventors of the present application have devised the present invention based on the technical idea of reducing the number of drawer tabs positioned in the cutout region as much as possible.
  • FIG. 7 is a schematic view showing a method for manufacturing an electrode assembly having a notch region.
  • a drawer tab among the plurality of electrodes 10 (the positive electrode 10A and / or the negative electrode 10B). 20 and a part of the electrode 10X having the connection tab 40, and the extraction tab 20 is positioned in the notch region 30 in plan view, and the connection tab 40 is located in a region other than the notch region 30.
  • the biggest feature is positioning.
  • the electrode 10X having the extraction tab 20 and the connection tab 40 is obtained mainly through the following steps (see FIG. 8).
  • a current collector 11 (metal foil) is prepared (see FIG. 8 (i)).
  • the electrode material layer 12 is applied over the current collector 11 (metal foil) (see FIG. 8 (ii)).
  • the punch tab precursor 20 ⁇ (corresponding to the electrode tab coated on the drawer tab 20 formed later) is formed in the notch region 30 by punching.
  • an electrode having a connection tab precursor 40 ⁇ (corresponding to an electrode material layer coated on the connection tab 40 formed later) in the cutout region 30 is formed (see FIG. 8 (iii)).
  • the electrode material layer 12 in the extraction tab precursor 20 ⁇ and the connection tab precursor 40 ⁇ is removed by a light beam or the like (not shown).
  • the electrode 10 having the extraction tab 20 in the cutout region 30 and the connection tab 40 in a region other than the cutout region 30 is obtained (see FIG. 8 (v)).
  • the extraction tabs of “a part” of the plurality of electrodes 10X are not positioned in the notch region 30 instead of all the extraction tabs of the plurality of electrodes.
  • the tab 20 is positioned in the notch area 30.
  • the electrode material layer 12 is applied to the current collector 11 (metal foil) over the entire surface, and predetermined by punching.
  • the electrode material layer 12 in the extraction tab precursor (corresponding to the electrode tab 12 formed on the extraction tab 20 formed later) is applied to the light beam. It is not necessary to remove each time. That is, in order to position the extraction tabs 20 of the “partial” electrodes 10 ⁇ / b> X among the plurality of electrodes 10 in the cutout region 30, the “all” extraction tabs 20 of the plurality of electrodes 10 are placed in the cutout region 30.
  • count of removing the electrode material layer 12 in an extraction tab precursor by a light beam etc. can be reduced in the middle of manufacture.
  • the manufacturing time of the planar stacked structure electrode assembly 100 having the cutout region 30 in a plan view is relatively shortened. can do. That is, it is possible to suppress a reduction in production efficiency of the electrode assembly 100 having a planar stacked structure having the notch region 30. Therefore, it is possible to efficiently obtain a secondary battery finally having a notch region.
  • the method for manufacturing a secondary battery according to an embodiment of the present invention preferably adopts the following aspect.
  • the method further includes a step of forming an electrode (positive electrode 10A and / or negative electrode 10B) having only the connection tab 40, and the connection tab 40 is positioned in a region other than the notch region 30 in a plan view.
  • one embodiment of the present invention is characterized in that only the extraction tabs 20 of some of the electrodes 10X are positioned in the cutout region 30. Therefore, there is an electrode that does not have the extraction tab 20 in the cutout region 30 in plan view.
  • connection tab 40 having no extraction tab 20 is provided.
  • An electrode 10Y having the same is manufactured. Specifically, the electrode 10 ⁇ / b> Y is manufactured so that the connection tab 40 is positioned in an area other than the notch area 30.
  • the electrode 10Y having only the connection tab 40 is obtained mainly through the following steps.
  • the electrode material layer 12 is applied over the current collector (metal foil).
  • the connection tab precursor (corresponding to the electrode material layer coated on the connection tab 40 formed later) is punched in a region other than the notch region 30 The electrode which has is formed.
  • the electrode material layer 12 in the connection tab precursor is removed by a light beam or the like.
  • the electrode 10Y having the connection tab 40 in a region other than the notch region 30 is obtained.
  • the electrode 10X is selected as the “partial” electrode among the desired number of the plurality of electrodes 10
  • the electrode 10Y is selected as the remaining electrode among the desired number of the plurality of electrodes 10; 10X and the electrode 10Y are laminated via the separator 50.
  • the connection tabs 40 are bundled together to form a connection portion, whereby the electrode assembly 100 in which the laminated electrodes are electrically connected is obtained.
  • the electrode assembly 100 After the electrode assembly 100 is manufactured, the electrode assembly 100 and the electrolytic solution are sealed in an exterior body having a cutout region corresponding to the cutout shape of the electrode assembly 100 in plan view. Thus, the manufacture of the secondary battery according to one embodiment of the present invention is finally completed.
  • the current collector is formed with a coated part 12 ⁇ coated with an active material and an uncoated part 60 where the active material is not locally applied. It is preferable to form the uncoated portion 60 in one direction in plan view so as to expose the portion sandwiched between the working portions 12 ⁇ and where the drawer tab 20 is installed and the main portion 11 ⁇ of the current collector 11.
  • FIG. 9A is a schematic diagram showing a method for manufacturing an electrode assembly including an electrode including an uncoated portion extending in one direction so as to expose the drawer tab and the main portion of the current collector in a plan view. is there.
  • one embodiment of the present invention is characterized in that the extraction tab 20 of the “part” electrode 10X among the plurality of electrodes 10 is positioned in the cutout region 30 (see FIG. 7).
  • An example of a method for forming the extraction tab 20 is to remove the electrode material layer in the extraction tab precursor 20 ⁇ (see FIG. 8 (iii)) with a light beam or the like during the production.
  • the electrode material layer in the extraction tab precursor 20 ⁇ may not be suitably removed by irradiation with a light beam or the like so that only the desired extraction tab 20 is exposed.
  • the uncoated portion 60 (not coated with the electrode material layer) extending in one direction so as to expose the portion where the drawer tab 20 is installed and the main portion 11 ⁇ of the current collector in a plan view. Is equivalently formed between one coating portion 12 ⁇ (corresponding to the electrode material layer) and the other coating portion 12 ⁇ when the electrode material layer is applied to the current collector. obtained to the electrode 10X 1 having a non-coated portion 60. Uncoated portions 60 of the electrode 10X 1, when applying the electrode material layer on the current collector, a portion not coating the electrode material layer between intentional coating unit, drawer tabs being manufactured It is not obtained by removing the electrode material layer in the precursor later with a light beam or the like. Therefore, it is possible to eliminate the possibility that the electrode material layer in the extraction tab precursor cannot be suitably removed by irradiation with a light beam or the like so that only the desired extraction tab 20 is exposed.
  • the electrode 10X 1 having the uncoated portion 60 is obtained mainly through the following steps.
  • a current collector 11 metal foil
  • the electrode material layer 12 is applied on the current collector 11 (metal foil) using a coater 80 or the like.
  • a plurality of uncoated portions 60 that is, portions where the electrode material layer 12 is not applied
  • a predetermined interval it is formed between one coating portion 12 ⁇ and the other coating portion 12 ⁇ in plan view.
  • the drawing tab 20 is provided in the cutout region 30 by punching, and the connection tab precursor (the connection tab 40 formed later) An electrode having an electrode material layer coated thereon) corresponding to a region other than the notch region 30 is formed.
  • the electrode material layer 12 in the connection tab precursor is removed by a light beam or the like.
  • the electrode 10X 1 is obtained with the uncoated portions 60.
  • connection tabs 40 are bundled together to form a connection portion, whereby the electrode assembly 100 in which the laminated electrodes are electrically connected is obtained.
  • the uncoated portion in one direction in plan view so that the uncoated portion 60 further exposes the portion where the connection tab 40 is installed.
  • FIG. 10 shows an electrode assembly including an electrode including an uncoated portion that extends in one direction so that a drawer tab and a connection tab face each other across a main portion of a current collector in a plan view. It is a schematic diagram which shows a manufacturing method.
  • a plurality of electrodes of the electrode assembly are constituted by a combination of an electrode having a drawer tab and a connection tab and an electrode having only a connection tab.
  • the electrode material layer in the connection tab precursor (corresponding to the electrode material layer coated on the connection tab formed later) is manufactured by a light beam or the like. Removing.
  • connection tab when manufacturing an electrode having a drawer tab and a connection tab, in the case where a connection tab is provided at an arbitrary position on the side of the main part of the current collector in an area other than the notch area, It may be necessary to perform the step of removing the electrode material layer and the step of removing the electrode material layer in the connection tab precursor in different time zones. That is, it is necessary to form the connection tab in a process different from the process of forming the drawer tab, and it may not be said that the production efficiency of the connection tab is high.
  • the portion where the drawer tab 20 is installed, the main portion 11 ⁇ of the current collector 11, and the portion where the connection tab 40 is installed are uncoated and extend in one direction so as to be exposed.
  • the coated portion 60 and intentionally formed between one of the coated portion 12 α and the other coating unit 12 α, to finally obtain the electrode 10X 2 having a non-coated portion 60.
  • the undrawn portion 60 extending in one direction so as to expose the drawer tab 20, the main part 11 ⁇ of the current collector 11, and the connection tab 40 is formed, the drawer tab precursor is formed during the production.
  • connection tab 40 there is no need to perform the step of removing the electrode material layer in the step and the step of removing the electrode material layer of the connection tab precursor in different time zones. Therefore, since it is not necessary to form the connection tab 40 in a separate process from the process of forming the drawer tab 20, it is possible to improve the production efficiency of each tab.
  • the electrode 10X 2 having a non-coated portion 60 is obtained mainly through the following steps.
  • a current collector 11 metal foil
  • the electrode material layer 12 is applied on the current collector 11 (metal foil).
  • a plurality of uncoated portions 60 that is, electrode materials
  • a portion where the layer 12 is not applied) is formed at a predetermined interval between the one coating portion 12 ⁇ and the other coating portion 12 ⁇ in plan view.
  • the drawing tab 20 is provided in the cutout region 30 by punching, and the connection tab 40 is provided in a region other than the cutout region 30.
  • the electrode which has is formed.
  • the electrode 10X 2 having a non-coated portion 60 is obtained.
  • connection tabs 40 are bundled together to form a connection portion, whereby the electrode assembly 100 in which the laminated electrodes are electrically connected is obtained.
  • this embodiment is characterized in that the drawer tab and the connection tab are formed without using, for example, a light beam from the viewpoint of improving the production efficiency of the tab, and is not limited to the embodiment shown in FIG. 10A.
  • the following coating modes may be adopted.
  • a coating mode shown in FIG. 10B may be adopted.
  • the coating mode unlike the mode shown in FIG. 10A (vertical direction in plan view), the part 20 ⁇ where the drawer tab 20 is installed, the main part 11 ⁇ of the current collector, and the part 40 ⁇ where the connection tab 40 is installed are exposed.
  • a plurality of uncoated portions 60 that is, portions where the electrode material layer 12 is not applied are formed between one coated portion 12 ⁇ and the other coated portion 12 ⁇ in the lateral direction in plan view. . That is, it means that the coating direction of the uncoated portion 60 is not limited.
  • a coating mode shown in FIG. 10C may be adopted.
  • the said application aspect has the characteristics in the method of punching performed after applying the electrode material layer 12 so that the uncoated part 60 may be formed. Specifically, the notch regions 30 of the respective electrodes are used effectively, and punching is performed so that a portion that is not used as an electrode having the notch region 30 is reduced as much as possible.
  • the coating mode shown in FIG. 10D may be adopted.
  • the portion 20 ⁇ where the drawer tab 20 is installed, the main portion 11 ⁇ of the current collector, and the portion 40 ⁇ where the connection tab 40 is installed are exposed.
  • a plurality of uncoated portions 60 (that is, portions where the electrode material layer 12 is not applied) are formed between the coated portions 12 ⁇ in the vertical and horizontal directions in plan view.
  • the positive electrode and the negative electrode are preferably positioned along the stacking direction so that the uncoated portion of the negative electrode and the uncoated portion of the positive electrode face each other in a cross-sectional view (see FIG. 5).
  • the positive electrode 10A and the negative electrode 10B are stacked via the separator 50, the positive electrode is prevented from preventing lithium from being deposited on the uncoated portion 60B of the negative electrode 10B.
  • 10A is preferably provided with an uncoated portion 60A that is disposed opposite to the uncoated portion 60B of the negative electrode 10B along the stacking direction.
  • the positive electrode 10A it is necessary to dispose the uncoated portion 60A so as to face the uncoated portion 60B formed on both sides (both main surface sides) of the negative electrode current collector 11B. Therefore, from the viewpoint of reducing the number of formations of the uncoated portion 60A of the positive electrode 10A, that is, from the viewpoint of improving the production efficiency of the positive electrode 10A having the uncoated portion 60A, the negative electrode material layer 12B having the uncoated portion 60B is removed from the negative electrode collection. It is preferable to form only on one side (one main surface side) of the electric body 11B.
  • a positive electrode that further includes an insulating member, and to position the insulating member at a portion facing the uncoated portion of the negative electrode in a cross-sectional view (see FIG. 6).
  • the insulating member 70A is provided on the main part 11A ⁇ of the current collector 11A of the positive electrode 10A or on the positive electrode material layer 12A. Specifically, the insulating member 70A is preferably positioned so as to face the uncoated portion 60B of the negative electrode 10B when the positive electrode 10A and the negative electrode 10B are stacked via the separator 50 as shown in FIG. . With this positioning, it is possible to prevent lithium from being deposited on the uncoated portion 60B of the negative electrode 10B when the positive electrode 10A and the negative electrode 10B are stacked via the separator 50.
  • a negative electrode current collector It is necessary to dispose the insulating members 70A so as to face the uncoated portions 60B formed on both sides (both main surface sides) of the body 11B. Therefore, from the viewpoint of reducing the number of times the insulating member 70A is provided, that is, from the viewpoint of improving the installation efficiency of the insulating member 70A, the negative electrode material layer 12B having the uncoated portion 60B is placed on one side of the negative electrode current collector 11B (one side It is preferable to form only on the main surface side).
  • an electrode material layer made of an active material is formed on the entire main portion of the current collector in a cross-sectional view by screen printing, whereby a drawer tab and a connection tab are formed. You may form the electrode which has.
  • This aspect is characterized in that the electrode material layer is formed over the entire main part of the current collector by screen printing except for the drawer tab and the connection tab.
  • the electrode material layer is formed only on the main part of the current collector, it is advantageous in that an unnecessary electrode material layer is less likely to be generated than in the case where the above-described continuous coating is performed.
  • the secondary battery according to an embodiment of the present invention can be used in various fields where power storage is assumed.
  • the secondary battery according to an embodiment of the present invention particularly the non-aqueous electrolyte secondary battery, is merely an example, and the electric / information / communication field (for example, a mobile phone, a smart phone, a notebook)
  • Mobile devices such as personal computers and digital cameras, activity meters, arm computers, and electronic paper
  • home and small industrial applications eg, power tools, golf carts, home, nursing and industrial robots
  • large industries Applications eg, forklifts, elevators, bay harbor cranes
  • transportation systems eg, hybrid vehicles, electric vehicles, buses, trains, electric assist bicycles, electric motorcycles
  • power system applications eg, various power generation
  • IoT field space and deep sea applications (for example, spacecraft, areas such as submersible research vessel) and the like.
  • Electrode assembly 10 electrode, 10X, 10X 1 , electrode with 10X 2 extraction tab and connection tab, electrode with 10Y connection tab only, 10A positive electrode, 10B negative electrode, 11 current collector, 11A positive electrode current collector, 11B Negative electrode current collector, 11 ⁇ , 11A ⁇ , 11B ⁇ Main part of current collector, 12 electrode material layer (active material layer), 12A positive electrode material layer, 12B negative electrode material layer, 12 ⁇ coating portion, 20, 20A, 20B Drawer tab, 20 ⁇ drawer tab precursor, 20 ⁇ drawer tab installation portion, 30, 30A, 30B cutout region, 40, 40A, 40B connection tab, 40 ⁇ connection tab precursor, 40 ⁇ connection tab installation portion, 50 separator, 60, 60A, 60B uncoated portion, 70A insulating member, 80 coater, the width of uncoated portion of the W 1 exposed cathode current collector of the main part on, W 2 positive The width of uncoated portion in the non width of the coating unit, W 3 exposed anode current collector of the main part on the on side drawer tabs 10 '

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Secondary Cells (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

Un mode de réalisation de la présente invention concerne une batterie secondaire dans laquelle un électrolyte et un ensemble d'électrodes 100 comprenant des électrodes positives 10A, des électrodes négatives 10B et des séparateurs 50 agencés entre les électrodes positives 10A et les électrodes négatives 10B sont logés dans un corps extérieur, l'ensemble d'électrodes 100 a une structure stratifiée plane dans laquelle une pluralité d'unités d'électrode comprenant une électrode positive 10A, une électrode négative 10B, et un séparateur 50 sont disposées en couches de manière plane, l'ensemble d'électrodes 100 comprend une zone d'encoche 30 dans une vue en plan, certaines des électrodes positives 10A parmi la pluralité d'électrodes positives 10A et/ou certaines des électrodes négatives 10B parmi la pluralité d'électrodes négatives 10B comprennent une languette de sortie 20 et une languette de connexion 40, les languettes de sortie 20 sont positionnées dans la zone d'encoche 30 dans une vue en plan, et les languettes de connexion 40 sont positionnées dans une zone autre que la zone d'encoche 30 dans une vue en plan.
PCT/JP2018/004397 2017-02-24 2018-02-08 Batterie secondaire et procédé de production de batterie secondaire WO2018155210A1 (fr)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2020145052A (ja) * 2019-03-05 2020-09-10 株式会社リコー 積層型電池、積層型電池の製造方法
JP2022542123A (ja) * 2019-07-30 2022-09-29 エルジー エナジー ソリューション リミテッド 二次電池用電極及び電極の製造方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002141055A (ja) * 2000-11-06 2002-05-17 Mitsubishi Chemicals Corp 平板積層型電池
WO2016006420A1 (fr) * 2014-07-10 2016-01-14 株式会社村田製作所 Procédé de fabrication d'un dispositif de stockage d'énergie et procédé de fabrication d'électrode
JP2016506606A (ja) * 2013-03-04 2016-03-03 エルジー・ケム・リミテッド 欠落部が形成された電池セル及びそれを含む電池パック

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002141055A (ja) * 2000-11-06 2002-05-17 Mitsubishi Chemicals Corp 平板積層型電池
JP2016506606A (ja) * 2013-03-04 2016-03-03 エルジー・ケム・リミテッド 欠落部が形成された電池セル及びそれを含む電池パック
WO2016006420A1 (fr) * 2014-07-10 2016-01-14 株式会社村田製作所 Procédé de fabrication d'un dispositif de stockage d'énergie et procédé de fabrication d'électrode

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2020145052A (ja) * 2019-03-05 2020-09-10 株式会社リコー 積層型電池、積層型電池の製造方法
JP7334427B2 (ja) 2019-03-05 2023-08-29 株式会社リコー 積層型電池、積層型電池の製造方法
JP2022542123A (ja) * 2019-07-30 2022-09-29 エルジー エナジー ソリューション リミテッド 二次電池用電極及び電極の製造方法
JP7250404B2 (ja) 2019-07-30 2023-04-03 エルジー エナジー ソリューション リミテッド 二次電池用電極及び電極の製造方法

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