WO2018155210A1 - Secondary battery and method for producing secondary battery - Google Patents

Secondary battery and method for producing secondary battery Download PDF

Info

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
Authority
WO
WIPO (PCT)
Prior art keywords
tab
electrode
negative electrode
positive electrode
current collector
Prior art date
Application number
PCT/JP2018/004397
Other languages
French (fr)
Japanese (ja)
Inventor
徹 川合
大塚　正博
Original Assignee
株式会社村田製作所
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社村田製作所 filed Critical 株式会社村田製作所
Publication of WO2018155210A1 publication Critical patent/WO2018155210A1/en

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • 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 '

Landscapes

  • 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

One embodiment of the present invention provides a secondary battery in which an electrolyte and an electrode assembly 100 including positive electrodes 10A, negative electrodes 10B, and separators 50 arranged between the positive electrodes 10A and the negative electrodes 10B are accommodated in an exterior body, the electrode assembly 100 has a planar layered structure in which a plurality of electrode units including a positive electrode 10A, a negative electrode 10B, and a separator 50 are layered in a planar manner, the electrode assembly 100 comprises a notch area 30 in a planar view, some of the positive electrodes 10A among the plurality of positive electrodes 10A and/or some of the negative electrodes 10B among the plurality of negative electrodes 10B comprise a lead-out tab 20 and a connection tab 40, the lead-out tabs 20 are positioned in the notch area 30 in a planar view, and the connection tabs 40 are positioned in an area other than the notch area 30 in a planar view.

Description

二次電池および二次電池の製造方法Secondary battery and method for manufacturing secondary battery
　本発明は、二次電池および二次電池の製造方法に関する。 The present invention relates to a secondary battery and a method for manufacturing the secondary battery.
　従前より充放電が繰り返し可能な二次電池が様々な用途に用いられている。例えば、二次電池は、スマートフォン、ノートパソコン等の電子機器の電源として用いられている。 Secondary batteries that can be repeatedly charged and discharged have been used for various purposes. For example, the secondary battery is used as a power source for electronic devices such as smartphones and notebook computers.
　近年、電子機器の薄型化・小型化の要求が一層高まっており、それに伴い、電子機器内にて二次電池に基板等を効率的に設けることが要求されている。これにつき、特許文献１には、平面視で切欠き領域を有する二次電池が開示されている。当該特許文献１では、二次電池の構成要素である電極組立体が、正極、負極およびセパレータを含む複数の電極ユニットを平面状に積層した平面積層構造を有する旨が開示されている。 In recent years, there has been an increasing demand for thinner and smaller electronic devices, and accordingly, it is required to efficiently provide a substrate or the like on a secondary battery in the electronic device. In this regard, 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.
特表２０１６－５０６６０６号公報Special table 2016-506606
　切欠き領域を有する二次電池では、基板等の効率的な設置の観点から当該切欠き領域に基板等を配置する場合があり得る。この場合、基板等と二次電池とを電気的に接続するために切欠き領域内に外部端子を位置付ける必要がある。電極組立体が上述のように平面積層構造を有する場合、外部端子は、例えば複数の電極（正極および/または負極）の各々の引出しタブを１つに束ねることで形成された引出し部とリードを介して電気的に接続される。この場合、各電極の引出しタブは、平面視で切欠き領域内に位置付けた外部端子と対向させる必要がある。つまり、平面視で各電極の引出しタブを切欠き領域内に位置付ける必要がある。 In a secondary battery having a notch region, a substrate or the like may be arranged in the notch region from the viewpoint of efficient installation of the substrate or the like. In this case, it is necessary to position the external terminal in the notch region in order to electrically connect the substrate and the secondary battery. When the electrode assembly has a planar laminated structure as described above, 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. In this case, 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.
　本願発明者らは、切欠き領域内に引出しタブをそれぞれ有する複数の電極を形成する場合、以下の問題が生じ得ることを見出した。具体的には、図１２に示すように、金属箔１１’（集電体）を準備する工程（図１２（ｉ）参照）、金属箔１１’上に電極材層１２’を一面に塗工する工程（図１２（ｉｉ）参照）、パンチングにより引出しタブ前駆体２０α’を切欠き領域３０’内に有する電極を形成する工程（図１２（ｉｉｉ）参照）、および引出しタブ前駆体２０α’（後刻に形成される引出しタブ２０’上に電極材層が塗工されたものに相当）における電極材層１２’を光ビームＬ等により除去する工程（図１２（ｉｖ）参照）を経て、切欠き領域３０’内に引出しタブ２０’を有する電極１０’を形成する（図１２（ｖ）参照）。しかしながら、引出しタブ２０’上には電極材層１２’は形成されないところ、金属箔１１’上に電極材層１２’を一面に塗工する際に、引出しタブ２０’を設ける箇所にのみ電極材層を局所的に塗工しないよう調整することは困難である。そのため、複数の電極１０’を形成するために、パンチング後に引出しタブ前駆体２０α’における電極材層１２’を光ビームＬ等によりその都度除去する必要がある。その結果、平面視にて切欠き領域を有する平面積層構造の電極組立体の製造に時間を要し、当該電極組立体の生産効率が低下することになる。以上の事から、最終的に切欠き領域を有する二次電池を効率的に得ることができない虞がある。 The inventors of the present application have found that the following problems may occur when forming a plurality of electrodes each having a lead-out tab in a notch region. Specifically, as shown in FIG. 12, 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 20α ′ in the cutout region 30 ′ by punching (see FIG. 12 (iii)), and an extraction tab precursor 20α ′ (see FIG. After the step of removing the electrode material layer 12 ′ with the light beam L or the like (corresponding to the electrode material layer coated on the drawer tab 20 ′ formed later) (see FIG. 12 (iv)) The electrode 10 ′ having the extraction tab 20 ′ is formed in the notch region 30 ′ (see FIG. 12 (v)). However, the electrode material layer 12 ′ is not formed on the extraction tab 20 ′. However, when the electrode material layer 12 ′ is coated on the metal foil 11 ′ on one side, 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. Therefore, in order to form a plurality of electrodes 10 ′, it is necessary to remove the electrode material layer 12 ′ in the extraction tab precursor 20 α ′ after punching with the light beam L or the like after punching. As a result, it takes time to manufacture an electrode assembly having a planar laminated structure having a notched region in plan view, and the production efficiency of the electrode assembly is reduced. From the above, there is a possibility that a secondary battery having a notch region cannot be obtained efficiently.
　本発明は、かかる事情に鑑みて案出されたものである。具体的には、本発明は、生産効率の低下が抑制可能な切欠き領域を有する電極組立体を備えた二次電池およびその製造方法を提供することを目的とする。 The present invention has been devised in view of such circumstances. Specifically, 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.
　上記目的を達成するために、本発明の一実施形態では、
　正極、負極および正極と負極との間に配置されたセパレータを含む電極組立体と、電解質とが外装体に収容された二次電池であって、
　電極組立体が、正極、負極およびセパレータを含む複数の電極ユニットを平面状に積層した平面積層構造を有し、かつ、平面視にて切欠き領域を有して成り、
　複数の正極のうちの一部の正極および複数の負極のうちの一部の負極の少なくとも一方が、引出しタブおよび接続タブを有し、
　引出しタブが平面視にて切欠き領域に位置付けられており、および接続タブが平面視にて切欠き領域以外の領域に位置付けられている、二次電池が提供される。 In order to achieve the above object, in one embodiment of the present invention,
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,
There is provided a secondary battery in which the drawer tab is positioned in a notch region in plan view, and the connection tab is positioned in a region other than the notch region in plan view.
　上記目的を達成するために、本発明の一実施形態では、
　正極、負極および正極と負極との間に配置されたセパレータを含み、かつ平面視にて切欠き領域を有して成る電極組立体と、電解質とが外装体に収容された二次電池の製造方法であって、
　電極組立体は、正極、負極およびセパレータを含む複数の電極ユニットを平面状に積層した平面積層構造を有し、
　複数の正極のうちの引出しタブと接続タブとを有する一部の正極、および複数の負極のうちの引出しタブと接続タブとを有する一部の負極の少なくとも一方を形成する工程を含み、並びに
　平面視にて、引出しタブを切欠き領域に位置付け、および接続タブを切欠き領域以外の領域に位置付ける、製造方法が提供される。 In order to achieve the above object, in one embodiment of the present invention,
Production of secondary battery including positive electrode, negative electrode and electrode assembly including separator disposed between positive electrode and negative electrode, and having notched region in plan view, and electrolyte accommodated in outer package A method,
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.
　本発明の一実施形態によれば、生産効率の低下が抑制された切欠き領域を有する電極組立体を供することができる。 According to an embodiment of the present invention, it is possible to provide an electrode assembly having a notched region in which a decrease in production efficiency is suppressed.
図１は、引出しタブおよび接続タブを有する電極を含む切欠き領域を備えた電極組立体の模式図である。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. 図２は、引出しタブおよび接続タブを有する電極と、接続タブのみを有する電極とを含む電極組立体の模式図である。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. 図３は、平面視にて引出しタブと集電体の主要部とを露出させるように一方向に延在する未塗工部を含む電極を模式的に示した斜視図である。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. 図４は、平面視にて引出しタブと接続タブとを集電体の主要部を挟んで相互に対向させるように一方向に延在する未塗工部を含む電極を模式的に示した斜視図である。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. 図５は、相互に対向する未塗工部をそれぞれ有する正極と負極とを模式的に示した分解斜視図である。FIG. 5 is an exploded perspective view schematically showing a positive electrode and a negative electrode each having an uncoated portion facing each other. 図６は、負極の未塗工部と正極に供した絶縁部材とが相互に対向する態様を模式的に示した分解斜視図である。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. 図７は、切欠き領域を備えた電極組立体の製造方法を示す模式図である。FIG. 7 is a schematic view showing a method for manufacturing an electrode assembly having a notch region. 図８は、引出しタブと接続タブとを有する電極の形成プロセスの模式図である。FIG. 8 is a schematic diagram of a process for forming an electrode having a drawer tab and a connection tab. 図９Ａは、平面視にて引出しタブと集電体の主要部とを露出させるように一方向に延在する未塗工部を含む電極を備えた電極組立体の製造方法を示す模式図である。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. 図９Ｂは、未塗工部を備えた電極の形成方法を示した模式図である。FIG. 9B is a schematic view showing a method for forming an electrode having an uncoated portion. 図１０は、平面視にて引出しタブと接続タブとを集電体の主要部を挟んで相互に対向させるように一方向に延在する未塗工部を含む電極を備えた電極組立体の製造方法を示す模式図である。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. 図１０Ａは、未塗工部を備えた電極の形成方法を示した模式図である。FIG. 10A is a schematic diagram illustrating a method for forming an electrode having an uncoated portion. 図１０Ｂは、未塗工部を備えた電極の別の形成方法を示した模式図である。FIG. 10B is a schematic view showing another method of forming an electrode having an uncoated portion. 図１０Ｃは、未塗工部を備えた電極の更に別の形成方法を示した模式図である。FIG. 10C is a schematic view showing still another method of forming an electrode having an uncoated portion. 図１０Ｄは、未塗工部を備えた電極の更に別の形成方法を示した模式図である。FIG. 10D is a schematic view showing still another method of forming an electrode having an uncoated portion. 図１１は、電極組立体の具体的構成を模式的に示した断面図である。FIG. 11 is a cross-sectional view schematically showing a specific configuration of the electrode assembly. 図１２は、本願発明者らが見出した技術的課題を示す模式図である。FIG. 12 is a schematic diagram showing the technical problem found by the inventors.
　以下、本発明の一実施形態に係る二次電池について説明する前に、二次電池の基本的構成について説明しておく。なお、本明細書でいう「二次電池」という用語は充電・放電の繰り返しが可能な電池のことを指す。「二次電池」は、その名称に過度に拘泥されるものではなく、例えば、「蓄電デバイス」なども包含し得る。本明細書でいう「平面視」とは、二次電池を構成する電極材の積層方向に基づく厚み方向に沿って対象物を上側または下側からみたときの状態のことである。本明細書でいう「断面視」とは、二次電池を構成する電極材の積層方向に基づく厚み方向に対して略垂直な方向からみたときの状態のことである。 Hereinafter, before describing a secondary battery according to an embodiment of the present invention, a basic configuration of the secondary battery will be described. 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.
［二次電池の基本的構成］
　二次電池は、外装体の内部に電極組立体と電解質とが収容および封入された構造を有して成る。電極組立体は、正極、負極、および正極と負極との間に配置されたセパレータを含んでいる。本発明では、電極組立体は、正極、負極およびセパレータを含む電極構成層が複数積層された平面積層構造を有することを前提とする。また、外装体は、導電性ハードケース又はフレキシブルケース（パウチ等）の形態を採ってよい。外装体の形態がフレキシブルケース（パウチ等）である場合、複数の正極の各々は、正極用集電リードを介して、正極用外部端子に連結されている。正極用外部端子はシール部により外装体に固定され、当該シール部は電解質の液漏れを防止する。同様に、複数の負極の各々は、負極用集電リードを介して負極用外部端子に連結されている。負極用外部端子はシール部により外装体に固定され、シール部が電解質の液漏れを防止する。なお、これに限定されず、複数の正極の各々と接続される正極用集電リードは正極用外部端子の機能を備えていてよく、また、複数の負極の各々と接続される負極用集電リードは負極用外部端子の機能を備えていてよい。外装体の形態が導電性ハードケースの場合、複数の正極の各々は、正極用集電リードを介して、正極用外部端子に連結されている。正極用外部端子はシール部により外装体に固定され、当該シール部は電解質の液漏れを防止する。 [Basic configuration of 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. In the present invention, it is assumed that 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. Further, 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. Similarly, 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. However, 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. When the form of the exterior body is a conductive hard case, 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.
　正極１０Ａは、少なくとも正極集電体１１Ａおよび正極材層１２Ａから構成されており（図１１参照）、正極集電体１１Ａの少なくとも片面に正極材層１２Ａが設けられている。当該正極集電体１１Ａのうち正極材層１２Ａが設けられていない箇所、すなわち正極集電体１１Ａの端部には正極側引出しタブ２０Ａが位置付けられている。正極材層１２Ａには電極活物質として正極活物質が含まれている。負極１０Ｂは少なくとも負極集電体１１Ｂおよび負極材層１２Ｂから構成されており（図１１参照）、負極集電体１１Ｂの少なくとも片面に負極材層１２Ｂが設けられている。当該負極集電体１１Ｂのうち負極材層１２Ｂが設けられていない箇所、すなわち負極集電体１１Ｂの端部には負極側引出しタブ２０Ｂが位置付けられている。負極材層１２Ｂには電極活物質として負極活物質が含まれている。 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.
　正極材層１２Ａに含まれる正極活物質および負極材層１２Ｂに含まれる負極活物質は、二次電池において電子の受け渡しに直接関与する物質であり、充放電、すなわち電池反応を担う正負極の主物質である。より具体的には、「正極材層１２Ａに含まれる正極活物質」および「負極材層１２Ｂに含まれる負極活物質」に起因して電解質にイオンがもたらされ、かかるイオンが正極１０Ａと負極１０Ｂとの間で移動して電子の受け渡しが行われて充放電がなされる。正極材層１２Ａおよび負極材層１２Ｂは特にリチウムイオンを吸蔵放出可能な層であることが好ましい。つまり、電解質を介してリチウムイオンが正極１０Ａと負極１０Ｂとの間で移動して電池の充放電が行われる二次電池が好ましい。充放電にリチウムイオンが関与する場合、二次電池は、いわゆる“リチウムイオン電池”に相当する。 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. That is, 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. When lithium ions are involved in charging / discharging, the secondary battery corresponds to a so-called “lithium ion battery”.
　正極材層１２Ａの正極活物質は例えば粒状体から成るところ、粒子同士の十分な接触と形状保持のためにバインダー（“結着材”とも称される）が正極材層１２Ａに含まれていることが好ましい。更には、電池反応を推進する電子の伝達を円滑にするために導電助剤が正極材層１２Ａに含まれていてよい。同様に、負極材層１２Ｂの負極活物質は例えば粒状体から成るところ、粒子同士の十分な接触と形状保持のためにバインダーが含まれることが好ましく、電池反応を推進する電子の伝達を円滑にするために導電助剤が負極材層１２Ｂに含まれていてよい。このように、複数の成分が含有されて成る形態ゆえ、正極材層１２Ａおよび負極材層１２Ｂはそれぞれ“正極合材層”および“負極合材層”などと称すこともできる。 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. Similarly, 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. In order to do so, a conductive additive may be included in the negative electrode material layer 12B. Thus, because of the form in which a plurality of components are contained, 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.
　正極活物質は、リチウムイオンの吸蔵放出に資する物質であることが好ましい。かかる観点でいえば、正極活物質は例えばリチウム含有複合酸化物であることが好ましい。より具体的には、正極活物質は、リチウムと、コバルト、ニッケル、マンガンおよび鉄から成る群から選択される少なくとも１種の遷移金属とを含むリチウム遷移金属複合酸化物であることが好ましい。つまり、二次電池の正極材層１２Ａにおいては、そのようなリチウム遷移金属複合酸化物が正極活物質として好ましくは含まれている。例えば、正極活物質はコバルト酸リチウム、ニッケル酸リチウム、マンガン酸リチウム、リン酸鉄リチウム、または、それらの遷移金属の一部を別の金属で置き換えたものであってよい。このような正極活物質は、単独種として含まれてよいものの、二種以上が組み合わされて含まれていてもよい。より好適な態様では正極材層１２Ａに含まれる正極活物質がコバルト酸リチウムとなっている。 The positive electrode active material is preferably a material that contributes to occlusion and release of lithium ions. From this point of view, the positive electrode active material is preferably, for example, a lithium-containing composite oxide. More specifically, 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. For example, 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. In a more preferred embodiment, the positive electrode active material contained in the positive electrode material layer 12A is lithium cobalt oxide.
　正極材層１２Ａに含まれる得るバインダーとしては、特に制限されるわけではないが、ポリフッ化ビリニデン、ビリニデンフルオライド－ヘキサフルオロプロピレン共重合体、ビリニデンフルオライド－テトラフルオロチレン共重合体およびポリテトラフルオロチレンなどから成る群から選択される少なくとも１種を挙げることができる。正極材層１２Ａに含まれ得る導電助剤としては、特に制限されるわけではないが、サーマルブラック、ファーネスブラック、チャンネルブラック、ケッチェンブラックおよびアセチレンブラック等のカーボンブラック、黒鉛、カーボンナノチューブおよび気相成長炭素繊維等の炭素繊維、銅、ニッケル、アルミニウムおよび銀等の金属粉末、ならびに、ポリフェニレン誘導体などから選択される少なくとも１種を挙げることができる。例えば、正極材層１２Ａのバインダーはポリフッ化ビニリデンであってよい。あくまでも例示にすぎないが、正極材層１２Ａの導電助剤はカーボンブラックである。さらに、正極材層１２Ａのバインダーおよび導電助剤が、ポリフッ化ビニリデンとカーボンブラックとの組合せとなっていてよい。 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. For example, the binder of the positive electrode material layer 12A may be polyvinylidene fluoride. Although it is only an example to the last, the conductive support agent of 12 A of positive electrode material layers is carbon black. Furthermore, the binder and conductive additive of the positive electrode material layer 12A may be a combination of polyvinylidene fluoride and carbon black.
　負極活物質は、リチウムイオンの吸蔵放出に資する物質であることが好ましい。かかる観点でいえば、負極活物質は例えば各種の炭素材料、酸化物、または、リチウム合金などであることが好ましい。 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.
　負極活物質の各種の炭素材料としては、黒鉛（天然黒鉛、人造黒鉛）、ハードカーボン、ソフトカーボン、ダイヤモンド状炭素などを挙げることができる。特に、黒鉛は電子伝導性が高く、負極集電体１１Ｂとの接着性が優れる点などで好ましい。負極活物質の酸化物としては、酸化シリコン、酸化スズ、酸化インジウム、酸化亜鉛および酸化リチウムなどから成る群から選択される少なくとも１種を挙げることができる。負極活物質のリチウム合金は、リチウムと合金形成され得る金属であればよく、例えば、Ａｌ、Ｓｉ、Ｐｂ、Ｓｎ、Ｉｎ、Ｂｉ、Ａｇ、Ｂａ、Ｃａ、Ｈｇ、Ｐｄ、Ｐｔ、Ｔｅ、Ｚｎ、Ｌａなどの金属とリチウムとの２元、３元またはそれ以上の合金であってよい。このような酸化物は、その構造形態としてアモルファスとなっていることが好ましい。結晶粒界または欠陥といった不均一性に起因する劣化が引き起こされにくくなるからである。あくまでも例示にすぎないが、負極材層１２Ｂの負極活物質が人造黒鉛となっていてよい。 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. For example, 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. Although it is only an illustration to the last, the negative electrode active material of the negative electrode material layer 12B may be artificial graphite.
　負極材層１２Ｂに含まれ得るバインダーとしては、特に制限されるわけではないが、スチレンブタジエンゴム、ポリアクリル酸、ポリフッ化ビニリデン、ポリイミド系樹脂およびポリアミドイミド系樹脂から成る群から選択される少なくとも１種を挙げることができる。例えば負極材層１２Ｂに含まれるバインダーはスチレンブタジエンゴムとなっていてよい。負極材層１２Ｂに含まれる得る導電助剤としては、特に制限されるわけではないが、サーマルブラック、ファーネスブラック、チャンネルブラック、ケッチェンブラックおよびアセチレンブラック等のカーボンブラック、黒鉛、カーボンナノチューブおよび気相成長炭素繊維等の炭素繊維、銅、ニッケル、アルミニウムおよび銀等の金属粉末、ならびに、ポリフェニレン誘導体などから選択される少なくとも１種を挙げることができる。なお、負極材層１２Ｂには、電池製造時に使用された増粘剤成分（例えばカルボキシルメチルセルロース）に起因する成分が含まれていてもよい。 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. For example, 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.
　あくまでも例示にすぎないが、負極材層１２Ｂにおける負極活物質およびバインダーが人造黒鉛とスチレンブタジエンゴムとの組合せとなっていてよい。 Although it is only an example to the last, 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.
　正極１０Ａおよび負極１０Ｂに用いられる正極集電体１１Ａおよび負極集電体１１Ｂは電池反応に起因して活物質で発生した電子を集めたり供給したりするのに資する部材である。このような集電体は、シート状の金属部材であってよく、多孔または穿孔の形態を有していてよい。例えば、集電体は金属箔、パンチングメタル、網またはエキスパンドメタル等であってよい。正極１０Ａに用いられる正極集電体１１Ａは、アルミニウム、ステンレスおよびニッケル等から成る群から選択される少なくとも１種を含んだ金属箔から成るものが好ましく、例えばアルミニウム箔であってよい。一方、負極１０Ｂに用いられる負極集電体１１Ｂは、銅、ステンレスおよびニッケル等から成る群から選択される少なくとも１種を含んだ金属箔から成るものが好ましく、例えば銅箔であってよい。 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. Such a current collector may be a sheet-like metal member and may have a porous or perforated form. For example, 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. On the other hand, 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.
　正極１０Ａおよび負極１０Ｂに用いられるセパレータ５０は、正負極の接触による短絡防止および電解質保持などの観点から設けられる部材である。換言すれば、セパレータ５０は、正極１０Ａと負極１０Ｂとの間の電子的接触を防止しつつイオンを通過させる部材であるといえる。好ましくは、セパレータ５０は多孔性または微多孔性の絶縁性部材であり、その小さい厚みに起因して膜形態を有している。あくまでも例示にすぎないが、ポリオレフィン製の微多孔膜がセパレータとして用いられてよい。この点、セパレータ５０として用いられる微多孔膜は、例えば、ポリオレフィンとしてポリエチレン（ＰＥ）のみ又はポリプロピレン（ＰＰ）のみを含んだものであってよい。更にいえば、セパレータ５０は、“ＰＥ製の微多孔膜”と“ＰＰ製の微多孔膜”とから構成される積層体であってもよい。セパレータ５０の表面は無機粒子コート層および／または接着層等により覆われていてもよい。セパレータの表面は接着性を有していてもよい。なお、セパレータ５０は、その名称によって特に拘泥されるべきでなく、同様の機能を有する固体電解質、ゲル状電解質、絶縁性の無機粒子などであってもよい。なお、電極の取扱いの更なる向上の観点から、セパレータ５０と電極（正極１０Ａ／負極１０Ｂ）は接着されていることが好ましい。セパレータ５０と電極との接着は、セパレータ５０として接着性セパレータを用いること、電極材層（正極材層１２Ａ／負極材層１２Ｂ）の上に接着性バインダーを塗布および／または熱圧着すること等によって為され得る。セパレータ５０または電極材層に接着性を供する接着剤としては、ポリフッ化ビニリデン、アクリル系接着剤等が挙げられる。 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. In other words, 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. Preferably, 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. In this regard, the microporous film used as the separator 50 may include, for example, only polyethylene (PE) or only polypropylene (PP) as the polyolefin. Furthermore, 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. In addition, it is preferable that the separator 50 and the electrode (positive electrode 10A / negative electrode 10B) 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. Examples of the adhesive that provides adhesiveness to the separator 50 or the electrode material layer include polyvinylidene fluoride and an acrylic adhesive.
　正極１０Ａおよび負極１０Ｂがリチウムイオンを吸蔵放出可能な層を有する場合、電解質は有機電解質および／または有機溶媒などの“非水系”の電解質であることが好ましい（すなわち、電解質が非水電解質となっていることが好ましい）。電解質では電極（正極１０Ａ・負極１０Ｂ）から放出された金属イオンが存在することになり、それゆえ、電解質は電池反応における金属イオンの移動を助力することになる。 When positive electrode 10A and negative electrode 10B have layers capable of occluding and releasing lithium ions, 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). Preferably). In 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.
　非水電解質は、溶媒と溶質とを含む電解質である。具体的な非水電解質の溶媒としては、少なくともカーボネートを含んで成るものが好ましい。かかるカーボネートは、環状カーボネート類および／または鎖状カーボネート類であってもよい。特に制限されるわけではないが、環状カーボネート類としては、プロピレンカーボネート（ＰＣ）、エチレンカーボネート（ＥＣ）、ブチレンカーボネート（ＢＣ）およびビニレンカーボネート（ＶＣ）から成る群から選択される少なくとも１種を挙げることができる。鎖状カーボネート類としては、ジメチルカーボネート（ＤＭＣ）、ジエチルカーボネート（ＤＥＣ）、エチルメチルカーボネート（ＥＭＣ）およびジプロピルカーボネート（ＤＰＣ）から成る群から選択される少なくも１種を挙げることができる。あくまでも例示にすぎないが、非水電解質として環状カーボネート類と鎖状カーボネート類との組合せが用いられ、例えばエチレンカーボネートとジエチルカーボネートとの混合物が用いられてよい。また、具体的な非水電解質の溶質としては、例えばＬｉＰＦ６、ＬｉＢＦ４等のＬｉ塩が用いられる。また、具体的な非水電解質の溶質としては、好ましくは例えばＬｉＰＦ６および／またはＬｉＢＦ４等のＬｉ塩が用いられる。 A non-aqueous electrolyte is an electrolyte containing a solvent and a solute. As a specific non-aqueous electrolyte solvent, a solvent containing at least carbonate is preferable. Such carbonates may be cyclic carbonates and / or chain carbonates. Although not particularly limited, 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 the 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). Although it is only an illustration to the last, 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. Moreover, as a specific solute of the nonaqueous electrolyte, for example, a Li salt such as LiPF 6 or LiBF 4 is used. In addition, as a specific nonaqueous electrolyte solute, for example, a Li salt such as LiPF 6 and / or LiBF 4 is preferably used.
　正極用集電リードおよび負極用集電リードとしては、二次電池の分野で使用されているあらゆる集電リードが使用可能である。そのような集電リードは、電子の移動が達成され得る材料から構成されればよく、例えばアルミニウム、ニッケル、鉄、銅、ステンレスなどの導電性材料から構成される。正極用集電リードはアルミニウムから構成されることが好ましく、負極用集電リードはニッケルから構成されることが好ましい。正極用集電リードおよび負極用集電リードの形態は特に限定されず、例えば、線又はプレート状であってよい。 As the positive electrode current collecting lead and the negative electrode current collecting lead, any current collecting lead used in the field of secondary batteries can be used. Such 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.
　外部端子としては、二次電池の分野で使用されているあらゆる外部端子が使用可能である。そのような外部端子は、電子の移動が達成され得る材料から構成されればよく、通常はアルミニウム、ニッケル、鉄、銅、ステンレスなどの導電性材料から構成される。外部端子５は、基板と電気的かつ直接的に接続されてもよいし、または他のデバイスを介して基板と電気的かつ間接的に接続されてもよい。なお、これに限定されず、複数の正極の各々と接続される正極用集電リードが正極用外部端子の機能を備えていてよく、また、複数の負極の各々と接続される負極用集電リードは負極用外部端子の機能を備えていてよい。 As the external terminal, 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. However, 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.
　外装体は、上述のように導電性ハードケース又はフレキシブルケース（パウチ等）の形態を有していてよい。 The exterior body may have the form of a conductive hard case or a flexible case (such as a pouch) as described above.
　導電性ハードケースは、本体部および蓋部からなっている。本体部は当該外装体の底面を構成する底部および側面部から成る。本体部と蓋部とは、電極組立体、電解質、集電リードおよび外部端子の収容後に密封される。密封方法としては、特に限定されるものではなく、例えばレーザー照射法等が挙げられる。本体部および蓋部を構成する材料としては、二次電池の分野でハードケース型外装体を構成し得るあらゆる材料が使用可能である。そのような材料は電子の移動が達成され得る材料であればよく、例えばアルミニウム、ニッケル、鉄、銅、ステンレスなどの導電性材料が挙げられる。本体部および蓋部の寸法は、主として電極組立体の寸法に応じて決定され、例えば電極組立体を収容したとき、外装体内での電極組立体の移動（ズレ）が防止される程度の寸法を有することが好ましい。電極組立体の移動を防止することにより、電極組立体の破壊が防止され、二次電池の安全性が向上する。 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. As 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. For example, when the electrode assembly is accommodated, 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.
　フレキシブルケースは、軟質シートから構成される。軟質シートは、シール部の折り曲げを達成できる程度の軟質性を有していればよく、好ましくは可塑性シートである。可塑性シートは、外力を付与した後、除去したとき、外力による変形が維持される特性を有するシートのことであり、例えば、いわゆるラミネートフィルムが使用できる。ラミネートフィルムからなるフレキシブルパウチは例えば、２枚のラミネートフィルムを重ね合わせ、その周縁部をヒートシールすることにより製造できる。ラミネートフィルムとしては、金属箔とポリマーフィルムを積層したフィルムが一般的であり、具体的には、外層ポリマーフィルム／金属箔／内層ポリマーフィルムから成る３層構成のものが例示される。外層ポリマーフィルムは水分等の透過および接触等による金属箔の損傷を防止するためのものであり、ポリアミドおよびポリエステル等のポリマーが好適に使用できる。金属箔は水分およびガスの透過を防止するためのものであり、銅、アルミニウム、ステンレス等の箔が好適に使用できる。内層ポリマーフィルムは、内部に収納する電解質から金属箔を保護するとともに、ヒートシール時に溶融封口させるためのものであり、ポリオレフィンまたは酸変性ポリオレフィンが好適に使用できる。 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. For example, 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. As 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.
［本発明の二次電池］
　上記二次電池の基本的構成を考慮した上で、以下、本発明の一実施形態に係る二次電池について説明する。なお、本発明の一実施形態に係る二次電池は、平面視で切欠き領域を有することを前提とする。より具体的には、当該二次電池の外装体に収容される電極組立体が平面視で切欠き領域を有することを前提とする。なお、以下、本明細書でいう「接続タブ」とは、電極（正極／負極）の未塗工部に相当する部分であって、集電リードに接合されていない部材を指す。本明細書でいう「接続部」とは、複数の接続タブを１つに束ねることで形成される部材を指す。本明細書でいう「引出しタブ」とは、電極（正極／負極）の未塗工部に相当する部分であって、集電リードに接合される部材を指す。本明細書でいう「引出し部」とは、複数の引出しタブを１つに束ねることで形成される部材を指す。又、本明細書でいう「切欠き領域」とは、初期の形状からその一部を意図的に欠損させた領域のことである。切欠き領域形成前の初期の形状は通常、矩形状である。切欠き領域の平面視形状は特に限定されず、例えば、矩形状、三角形状、扇形形状、半円形状、円形状等が挙げられる。 [Secondary battery of the present invention]
A secondary battery according to an embodiment of the present invention will be described below in consideration of the basic configuration of the secondary battery. In addition, the secondary battery which concerns on one Embodiment of this invention presupposes having a notch area | region by planar view. More specifically, it is assumed that the electrode assembly accommodated in the exterior body of the secondary battery has a notch region in plan view. Hereinafter, the “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. In addition, 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.
　本願発明者らは、複数の電極１０’の各々の引出しタブ２０’を切欠き領域３０’内に全て位置付ける態様では、平面視にて切欠き領域を有する平面積層構造の電極組立体の生産効率が低下するという技術的課題を解決するため、鋭意検討し、本発明の一実施形態に係る二次電池を案出するに至った。具体的には、本願発明者らは、複数の電極１０’の各々の引出しタブ２０’を切欠き領域３０’内に全て位置付けるのではなく、複数の電極のうちの一部の電極の引出しタブのみを切欠き領域に位置付けるという新たな対応を案出するに至った。すなわち、本願発明者らは、切欠き領域内に位置付ける引出しタブの数を可能な限り減じるという技術的思想に基づき、本発明を案出するに至った。 In the embodiment in which the respective extraction tabs 20 ′ of the plurality of electrodes 10 ′ are all positioned in the cutout region 30 ′, 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. In order to solve the technical problem of lowering, the inventors have intensively studied and came up with 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.
　図１は、引出しタブおよび接続タブを有する電極を含む切欠き領域を備えた電極組立体の模式図である。 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.
　本発明の一実施形態に係る二次電池は、外装体の内部に電極組立体１００と電解質とが収容および封入された構造を有して成る。図１に示すように、電極組立体１００は、正極１０Ａ、負極１０Ｂおよびセパレータ５０を含む複数の電極ユニットを平面状に積層した平面積層構造を有し、かつ平面視で切欠き領域３０を有して成る。 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. As shown in FIG. 1, 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
　本発明の一実施形態では、電極組立体１００の構成要素である複数の電極１０（正極１０Ａおよび/または負極１０Ｂ）のうちの一部の電極１０Ｘが平面視で引出しタブ２０および接続タブ４０を有して成り、かつ当該引出しタブ２０が平面視で切欠き領域３０内に位置付けられている一方、接続タブ４０が平面視で切欠き領域３０以外の領域に位置付けられている。この点が本発明の主たる特徴である。具体的には、本発明の一実施形態では、複数の正極１０Ａのうちの一部の正極１０Ａおよび複数の負極１０Ｂのうちの一部の負極１０Ｂの少なくとも一方が平面視で引出しタブ２０および接続タブを有して成る。なお、複数の正極１０Ａのうちの一部の正極１０Ａおよび複数の負極１０Ｂのうちの一部の負極１０Ｂのいずれもが平面視で引出しタブ２０および接続タブ４０を有して成ることが好ましい。 In one embodiment of the present invention, some of the electrodes 10X of the plurality of electrodes 10 (the positive electrode 10A and / or the negative electrode 10B) that are components of the electrode assembly 100 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. This is the main feature of the present invention. Specifically, in one embodiment of the present invention, 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.
　電極１０は、図１に示すように集電体１１および当該集電体１１上に設けられた電極材層１２を有して成る。詳細には、正極１０Ａとして用いられる電極１０は、図１に示すように正極集電体１１Ａおよび当該正極集電体１１Ａ上に設けられた正極材層１２Ａを有して成る。なお、図１に示すように、電極組立体１００の最外層領域に位置付けられる正極１０Ａでは、電池特性に直接寄与しない正極材層を排除する観点から正極材層１２Ａは正極集電体１１Ａの一方の側（一方の主面側）にのみ設けられることが好ましい。具体的には、当該正極材層１２Ａは、電池特性に直接寄与しない正極材層を排除する観点から正極集電体１１Ａとセパレータ５０との間に位置付けられることが好ましい。同様に、電極組立体１００の最外層領域に位置付けられる負極１０Ｂでは、電池特性に直接寄与しない負極材層を排除する観点から負極材層１２Ｂは負極集電体１１Ｂの一方の側（一方の主面側）にのみ設けられることが好ましい。具体的には、当該負極材層１２Ｂは、電池特性に直接寄与しない負極材層を排除する観点から負極集電体１１Ｂとセパレータ５０との間に位置付けられることが好ましい。 The electrode 10 has a current collector 11 and an electrode material layer 12 provided on the current collector 11 as shown in FIG. Specifically, 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. As shown in FIG. 1, in the positive electrode 10A positioned in the outermost layer region of the electrode assembly 100, 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). Specifically, 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. Similarly, in 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. Specifically, 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.
　上述のように、複数の電極１０（正極１０Ａおよび/または負極１０Ｂ）のうちの一部の電極１０Ｘが、平面視で引出しタブ２０および接続タブ４０を有して成る構成を採っている。かかる構成を採ることにより、複数の電極１０の各々の引出しタブが全て切欠き領域３０内に位置付けられるのではなく、複数の電極１０のうちの「一部」の電極１０Ｘの引出しタブ２０が切欠き領域３０内に位置付けられる。 As described above, 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. By adopting such a configuration, 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.
　そのため、切欠き領域３０内に引出しタブ２０を含む電極１０を形成するために、集電体１１（金属箔）に電極材層１２を一面に塗工し、パンチングにより所定形状の切欠き領域を有する電極１０を形成した後、引出しタブ前駆体（後刻に形成される引出しタブ２０上に電極材層１２が塗工されたものに相当）における電極材層１２を光ビーム等によりその都度除去する必要がない。つまり、複数の電極１０のうちの「一部」の電極１０Ｘの引出しタブ２０を切欠き領域３０内に位置付ける場合、複数の電極１０の「全て」の各引出しタブ２０を切欠き領域３０内に位置付ける場合と比べて、製造途中で引出しタブ前駆体（後刻に形成される引出しタブ２０上に電極材層１２が塗工されたものに相当）における電極材層１２を光ビーム等により除去する回数を減じることができる。当該切欠き領域３０内における引出しタブ前駆体からの電極材層１２の除去回数の低減により、平面視にて切欠き領域３０を有する平面積層構造の電極組立体１００の製造時間を相対的に短縮することができる。つまり、切欠き領域３０を有する平面積層構造の電極組立体１００の生産効率の低減を抑制することができる。従って、最終的に切欠き領域を有する二次電池を効率的に得ることができる。 Therefore, in order to form the electrode 10 including the extraction tab 20 in the notch region 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. After the electrode 10 is formed, 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. Compared to the case of positioning, 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. By reducing the number of removals of the electrode material layer 12 from the extraction tab precursor in the cutout region 30, 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.
　なお、切欠き領域３０内に位置付けられた引出しタブ２０は、外部端子と電気的に接続可能に構成されている。具体的には、複数の電極１０のうちの「一部」の電極１０Ｘの各々の引出しタブ２０が全体として２つ以上存在する場合、２つ以上の引出しタブ２０を１つに束ねることで形成した引出し部が、集電リードを介して外部端子と電気的に接続可能に構成される。平面視にて切欠き領域を有する電極組立体を用いる場合、外装体の寸法を可能な限り減じる観点から当該電極組立体を収容する外装体も平面視にて切欠き領域を有する。この場合、平面視にて、切欠き領域３０内の引出しタブ２０に対向する外部端子が、外装体の切欠き領域を形成する面から露出するように位置付けられる。これにより、外装体の切欠き領域内に、当該外部端子と電気的に接続可能に基板等を配置することが可能となる。つまり、基板等を効率的に配置することが可能となる。 Note that the drawer tab 20 positioned in the notch region 30 is configured to be electrically connectable to an external terminal. Specifically, when there are two or more extraction tabs 20 for each of the “partial” electrodes 10X of the plurality of electrodes 10, the two or more extraction tabs 20 are bundled into one. The drawn portion is configured to be electrically connectable to an external terminal through the current collecting lead. In the case of using an electrode assembly having a cutout area in plan view, 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. In this case, 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. Thereby, it becomes possible to arrange | position a board | substrate etc. in the notch area | region of an exterior body so that electrical connection with the said external terminal is possible. That is, it becomes possible to arrange a board | substrate etc. efficiently.
　本発明の一実施形態に係る二次電池は、下記態様を採ることが好ましい。 The secondary battery according to an embodiment of the present invention preferably adopts the following aspects.
　一態様では、１つのみの正極１０Ａおよび１つのみの負極１０Ｂの少なくとも一方が、切欠き領域３０内に引出しタブ２０および切欠き領域３０以外の領域に接続タブ４０を有することが好ましい（図１参照）。 In one aspect, it is preferable that 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).
　上記態様では、複数の電極１０のうちの「一部」の電極１０Ｘの引出しタブ２０が切欠き領域３０内に位置付けられる態様について説明した。この点につき、平面視にて切欠き領域３０を有する平面積層構造の電極組立体１００の製造時間を相対的により短縮する観点から製造途中での引出しタブ前駆体（後刻に形成される引出しタブ２０上に電極材層１２が塗工されたものに相当）における電極材層１２の除去回数をより減じることが好ましい。そこで、本態様では、当該除去回数をより減じる観点から１つのみの電極１０（正極１０Ａおよび/または負極１０Ｂ）は、切欠き領域３０内に引出しタブ２０および切欠き領域３０以外の領域に接続タブ４０を有することが好ましい。換言すれば、複数の電極１０のうちの１つの電極１０の引出しタブ２０「のみ」を切欠き領域３０内に位置付けることが好ましい。 In the above aspect, the aspect in which the extraction tab 20 of the “partial” electrode 10 </ b> X among the plurality of electrodes 10 is positioned in the notch region 30 has been described. With respect to this point, a drawing tab precursor (drawing tab 20 formed later) in the middle of manufacturing from the viewpoint of relatively shortening the manufacturing time of the electrode assembly 100 having a planar laminated structure having the cutout region 30 in plan view. It is preferable to further reduce the number of removals of the electrode material layer 12 in the case where the electrode material layer 12 is coated thereon. Therefore, in this embodiment, from the viewpoint of further reducing the number of removals, 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.
　複数の電極１０のうちの１つの電極１０の引出しタブ２０「のみ」を切欠き領域３０内に位置付ける場合、上記の複数の電極１０のうちの「一部」の電極１０Ｘの各引出しタブ２０を切欠き領域３０内に位置付ける場合と比べて、製造途中で引出しタブ前駆体（後刻に形成される引出しタブ２０上に電極材層１２が塗工されたものに相当）における電極材層１２を光ビーム等により除去する回数をより減じることができる。当該電極材層１２の除去回数の更なる低減により、平面視にて切欠き領域３０を有する平面積層構造の電極組立体１００の製造時間を相対的により短縮することができる。つまり、切欠き領域３０を有する平面積層構造の電極組立体１００の生産効率の低減をより抑制することができる。従って、最終的に切欠き領域を有する二次電池をより効率的に得ることができる。 When 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. By further reducing the number of removals of the electrode material layer 12, it is possible to relatively shorten the manufacturing time of the electrode assembly 100 having a planar laminated structure having the notched region 30 in plan view. That is, it is possible to further suppress a reduction in production efficiency of the electrode assembly 100 having a planar stacked structure having the cutout region 30. Therefore, it is possible to obtain a secondary battery that finally has a cutout region more efficiently.
　一態様では、電極組立体１００は、接続タブ４０のみを有する正極１０Ａおよび接続タブ４０のみを有する負極１０Ｂの少なくとも一方を更に有し、接続タブ４０が切欠き領域３０以外の領域に位置付けられていることが好ましい。 In one aspect, 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.
　図２は、引出しタブおよび接続タブを有する電極と、接続タブのみを有する電極とを含む電極組立体の模式図である。 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.
　上述のように、本発明の一実施形態は、複数の電極１０（正極１０Ａおよび/または負極１０Ｂ）のうちの一部の電極１０Ｘが、平面視で切欠き領域３０内に引出しタブ２０および切欠き領域３０以外の領域内に接続タブ４０を有して成る構成を採ることを特徴としている。つまり、本発明の技術的思想は、複数の電極１０のうちの一部の電極１０Ｘの引出しタブ２０のみを切欠き領域３０内に位置付けるということである。かかる技術的思想によれば、平面視で切欠き領域３０内に引出しタブ２０を有しない電極が存在することになる。 As described above, according to one embodiment of the present invention, 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.
　そこで、当該引出しタブ２０を含む電極と、当該引出しタブ２０を有しない電極とを含む電極組立体１００を全体として電気的に接続可能とするために、本態様では、図１に示すように、引出しタブ２０を有しない電極１０Ｙは、接続タブ４０（のみ）を有し、当該接続タブ４０が切欠き領域３０以外の領域に位置付けられる。そして、引出しタブ２０および接続タブ４０を有する電極１０Ｘと、接続タブ４０のみを有する電極１０Ｙとが、各接続タブ４０を１つに束ねて接続部を形成することによって相互に電気的に接続可能となる。これにより、引出しタブ２０を含む電極１０Ｘと、引出しタブ２０を有しない電極１０Ｙとを含む電極組立体１００が全体として電気的に接続可能となる。つまり、電極組立体１００は、引出しタブ２０および接続タブ４０を有する電極１０Ｘと、接続タブ４０のみを有する電極１０Ｙとが、各接続タブ４０を１つに束ねて接続部を形成することによって相互に電気的に接続可能となる。 Therefore, in order to enable the electrode assembly 100 including the electrode including the extraction tab 20 and the electrode not including the extraction tab 20 to be electrically connected as a whole, in this aspect, as illustrated in FIG. 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. Thereby, 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.
　以上の事からも、電極組立体１００の構成要素である複数の電極１０は、積層方向に沿って、引出しタブ２０および接続タブ４０を有する電極１０Ｘと、接続タブ４０のみを有する電極１０Ｙとの組合せから構成されている点に特徴を有する。なお、電極１０として正極１０Ａが用いられる場合、複数の正極１０Ａは、積層方向に沿って、引出しタブ２０および接続タブ４０を有する電極１０Ｘ（正極）と、接続タブ４０のみを有する電極１０Ｙ（正極）との組合せから構成されている。一方、電極１０として負極１０Ｂが用いられる場合、複数の負極１０Ｂは、積層方向に沿って、引出しタブ２０および接続タブ４０を有する電極１０Ｘ（負極）と、接続タブ４０のみを有する電極１０Ｙ（負極）との組合せから構成されている。 Also from the above, 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. When the positive electrode 10A is used as the electrode 10, 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. )). On the other hand, when the negative electrode 10B is used as the electrode 10, 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. )).
　一態様では、引出しタブ２０および接続タブ４０を有する電極１０Ｘ１（正極および/または負極）は、断面視にて集電体１１に活物質が塗工された塗工部１２αおよび当該活物質が局所的に塗工されていない未塗工部６０を有し、未塗工部６０が、平面視にて引出しタブ２０と集電体の主要部１１αとを露出させるように、一方向に延在していることが好ましい。 In one embodiment, the electrode 10X 1 (positive electrode and / or negative electrode) having the extraction tab 20 and the connection tab 40 includes a coating portion 12α 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 11α of the current collector in plan view. Preferably present.
　ここでいう「集電体の主要部」とは、広義には集電体の主たる部分を指し、狭義にはその上面に電極材層が形成される部分を指す。なお、引出しタブ２０および接続タブ４０は、集電体の一部を成し、当該集電体の主要部の側部に設けられるものであることを確認的に述べておく。ここでいう「塗工部」とは、集電体上に電極材層が塗工されている部分を指す。ここでいう「未塗工部」とは、集電体上に電極材層が塗工されていない部分を指す。そのため、当該「未塗工部」は非塗工部と称してもよい。 As used herein, 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.
　図３は、平面視にて引出しタブと集電体の主要部とを露出させるように一方向に延在する未塗工部を含む電極を模式的に示した斜視図である。 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.
　上述のように、本発明の一実施形態は、複数の電極１０のうちの「一部」の電極１０Ｘの引出しタブ２０が切欠き領域３０内に位置付けられることを特徴とする（図１および図２参照）。当該引出しタブ２０は、その上面に電極材層を有していない構成となっている。上述のように、引出しタブ２０の形成のために、製造途中で引出しタブ前駆体（後刻に形成される引出しタブ２０上に電極材層が塗工されたものに相当）における電極材層を光ビーム等により除去することが挙げられる。しかしながら、引出しタブ前駆体における電極材層を、所望の引出しタブ２０のみが露出するように光ビーム等の照射により好適に除去できない可能性があり得る。 As described above, 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. As described above, in order to form the extraction tab 20, 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. However, there is a 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.
　そこで、本態様では、下記の本発明の一実施形態に係る製造方法でも述べるが、平面視にて引出しタブ２０を設置する部分と集電体の主要部１１αとを露出させるように一方向に延在する未塗工部６０を、集電体に電極材層を塗工する際に一方の塗工部１２αと他方の塗工部１２αとの間に意図的に形成する。つまり、製造途中で引出しタブ前駆体（後刻に形成される引出しタブ２０上に電極材層が塗工されたものに相当）における電極材層を光ビーム等により後刻に除去する必要がない。そのため、引出しタブ前駆体における電極材層を、所望の引出しタブ２０のみが露出するように光ビーム等の照射により好適に除去できない可能性を排除することができる。 Therefore, in this aspect, as described in the manufacturing method according to one embodiment of the present invention described below, the part where the drawer tab 20 is installed and the main part 11α of the current collector are exposed in one direction in plan view. The extending uncoated portion 60 is intentionally formed between one coated portion 12α and the other coated portion 12α 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.
　一態様では、一方向に延在している未塗工部６０において、平面視にて引出しタブ２０と接続タブ４０とが集電体１１の主要部１１αを挟んで相互に対向していることが更に好ましい。 In one aspect, in the uncoated part 60 extending in one direction, the drawer tab 20 and the connection tab 40 are opposed to each other across the main part 11α of the current collector 11 in plan view. Is more preferable.
　図４は、平面視にて引出しタブと接続タブとを集電体の主要部を挟んで相互に対向させるように一方向に延在する未塗工部を含む電極を模式的に示した斜視図である。 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.
　図４に示す態様は、未塗工部６０において平面視にて引出しタブ２０と接続タブ４０とが集電体１１の主要部１１αを挟んで相互に対向していることを特徴とする。つまり、図４に示す態様は、図３に示す態様と比べて一方向に延在する未塗工部６０において、平面視にて集電体１１の主要部１１αの一方の側に引出しタブ２０が位置付けられ、かつ集電体１１の主要部１１αの他方の側に接続タブ４０が位置付けられていることを特徴とする。端的に言うと、平面視で、一方向に延在する未塗工部６０において、引出しタブ２０、集電体１１の主要部１１α、および接続タブ４０が露出するように構成されている。 4 is characterized in that the drawer tab 20 and the connection tab 40 are opposed to each other across the main part 11α 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 11α of the current collector 11 in a plan view. And the connection tab 40 is positioned on the other side of the main part 11α 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 11α of the current collector 11, and the connection tab 40 are exposed.
　上述のように、本発明の一実施形態では、電極は、引出しタブ２０および接続タブ４０を有する電極１０Ｘと、接続タブ４０のみを有する電極１０Ｙとの組合せから構成されている（図２参照）。電極１０Ｘおよび電極１０Ｙは共に接続タブ４０を有する。当該接続タブ４０は、その上面に電極材層を有していない構成となっている。上述のように、接続タブ４０の形成のために、製造途中で接続タブ前駆体（後刻に形成される接続タブ４０上に電極材層が塗工されたものに相当）における電極材層を光ビーム等により除去することが挙げられる。本実施形態では、接続タブ４０は切欠き領域３０内以外の領域に位置付けられる、例えば図１～図３に示すように集電体１１の主要部１１αの側部に設けられる。しかしながら、接続タブ４０が切欠き領域３０以外の領域の集電体１１の主要部１１αの側部の任意の箇所に設けられる場合、製造途中で引出しタブ前駆体（後刻に形成される引出しタブ２０上に電極材層が塗工されたものに相当）における電極材層を除去する工程と、接続タブ前駆体（後刻に形成される接続タブ４０上に電極材層が塗工されたものに相当）における電極材層を除去する工程とを異なる時間帯で行う必要があり得る。つまり、引出しタブ２０の形成工程とは別工程で接続タブ４０を形成する必要があり、各タブの生産効率が高いとは言えない可能性があり得る。 As described above, in one embodiment of the present invention, 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. As described above, in order to form the connection tab 40, 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. In the present embodiment, the connection tab 40 is located in a region other than the notch region 30, for example, as shown in FIGS. 1 to 3, provided on the side portion of the main portion 11 α of the current collector 11. However, when the connection tab 40 is provided at an arbitrary position on the side of the main part 11α 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.
　そこで、下記の本発明の一実施形態に係る製造方法でも述べるが、平面視にて、一方向に延在する未塗工部６０において、引出しタブ２０を設置する部分、集電体１１の主要部１１α、および接続タブ４０を設置する部分をそれぞれ露出させるように一方向に延在する未塗工部６０を、一方の塗工部１２αと他方の塗工部１２αとの間に意図的に形成する。つまり、製造途中で引出しタブ前駆体（後刻に形成される引出しタブ２０上に電極材層が塗工されたものに相当）における電極材層を除去する工程と、接続タブ前駆体（後刻に形成される接続タブ４０上に電極材層が塗工されたものに相当）における電極材層を除去する工程とを異なる時間帯で行う必要がない。従って、引出しタブ２０の形成工程とは別工程で接続タブ４０を形成する必要がないため、各タブの生産効率を向上させることが可能となる。 Therefore, as will be described in the manufacturing method according to an embodiment of the present invention described below, in 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 11α and the portion where the connection tab 40 is installed is intentionally placed between one coated portion 12α and the other coated portion 12α. Form. That is, 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.
　一態様では、引出しタブ２０Ｂおよび接続タブ４０Ｂを有する負極１０Ｂの未塗工部６０Ｂと、引出しタブ２０Ａおよび接続タブ４０Ａを有する正極１０Ａの未塗工部６０Ａとが、断面視にて相互に対向するように位置付けられていることが好ましい。 In one aspect, 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.
　図５は、相互に対向する未塗工部をそれぞれ有する正極と負極とを模式的に示した分解斜視図である。 FIG. 5 is an exploded perspective view schematically showing a positive electrode and a negative electrode each having an uncoated portion facing each other.
　図５に示す態様では、正極１０Ａは、切欠き領域３０Ａ内に位置付けられた引出しタブ２０Ａおよび切欠き領域３０Ａ以外の領域に位置付けられた接続タブ４０Ａを備えている。具体的には、本態様では、切欠き領域３０Ａ内における正極集電体１１Ａの主要部１１Ａαの側部に正極側引出しタブ２０Ａが位置付けられ、切欠き領域３０Ａ以外の領域における正極集電体１１Ａの主要部１１Ａαの側部に正極側接続タブ４０Ａが位置付けられている。正極集電体１１Ａの一方の側には正極材層１２Ａが一面に塗工されている一方、正極集電体１１Ａの他方の側には平面視で正極材層１２Ａ（塗工部に相当）が未塗工部６０Ａを挟んで両側に塗工されている。 5, 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. Specifically, in this embodiment, the positive electrode side extraction tab 20A is positioned on the side of the main portion 11Aα 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 11Aα. On one side 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.
　正極１０Ａの未塗工部６０Ａは、平面視にて正極側引出しタブ２０Ａと正極集電体１１Ａの主要部１１Ａαとを露出させるように一方向に延在している。当該露出した正極集電体１１Ａの主要部１１Ａα上における未塗工部６０Ａの幅寸法Ｗ１は、正極側引出しタブ２０Ａ上における未塗工部６０Ａの幅寸法Ｗ２より大きい。詳細には、露出した正極集電体１１Ａの主要部１１Ａα上における未塗工部６０Ａの幅寸法Ｗ１と正極側引出しタブ２０Ａ上における未塗工部６０Ａの幅寸法Ｗ２との差が、後述する露出した負極集電体１１Ｂの主要部１１Ｂα上における未塗工部６０Ｂの幅寸法Ｗ３と略等しくなっている。 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 11Aα of the positive electrode current collector 11A in plan view. Uncoated portion 60A width W 1 of the on the main unit 11Aα 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. In particular, 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 11Aα 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 11Bα of the negative electrode current collector 11B exposed to be described later.
　一方、図５に示す態様では、負極１０Ｂは、切欠き領域３０Ｂ内に位置付けられた負極側引出しタブ２０Ｂおよび切欠き領域３０Ｂ以外の領域に位置付けられた接続タブ４０Ｂを備えている。具体的には、本態様では、切欠き領域３０Ｂ内における負極集電体１１Ｂの主要部１１Ｂαの側部に負極側引出しタブ２０Ｂが位置付けられ、切欠き領域３０Ｂ以外の領域における負極集電体１１Ｂの主要部１１Ｂαの側部に負極側接続タブ４０Ｂが位置付けられている。 On the other hand, in the embodiment shown in FIG. 5, 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. Specifically, in this embodiment, the negative electrode extraction tab 20B is positioned on the side of the main part 11Bα 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 11Bα.
　負極材層１２Ｂ（塗工部に相当）は、負極集電体１１Ｂの一方の側にのみ平面視で未塗工部６０Ｂを挟んで両側に塗工されていることが好ましい。セパレータ５０を介して正極１０Ａと負極１０Ｂとを積層した際に、負極１０Ｂの未塗工部６０Ｂにリチウムが析出することを防止する観点から、上述するように正極１０Ａにも負極１０Ｂの未塗工部６０Ｂに積層方向に沿って対向配置される未塗工部６０Ａを設けることが好ましい。端的に言うと、負極１０Ｂの未塗工部６０Ｂにリチウムが析出することを防止する観点から、積層方向に沿って正極１０Ａの未塗工部６０Ａと負極１０Ｂの未塗工部６０Ｂとが対向配置されることが好ましい。 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. In short, from the viewpoint of preventing lithium from precipitating on the uncoated portion 60B of the negative electrode 10B, 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.
　ここで、未塗工部６０Ｂを負極集電体１１Ｂの両側（両主面側）に形成する場合、両側に形成した未塗工部６０Ｂにリチウムが析出することを防止する観点から、正極１０Ａの未塗工部６０Ａを、負極集電体１１Ｂの両側に形成した未塗工部６０Ｂにそれぞれ対向配置する必要がある。従って、正極１０Ａの未塗工部６０Ａの形成回数を減じる観点、すなわち未塗工部６０Ａを有する正極１０Ａの生産効率を向上させる観点から、未塗工部６０Ｂを有する負極材層１２Ｂは負極集電体１１Ｂの一方の側（一方の主面側）にのみ形成されることが好ましい。 Here, 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.
　一態様では、引出しタブ２０Ａおよび接続タブ４０Ａを有する正極１０Ａは、断面視にて負極１０Ｂの未塗工部６０Ｂに対向するように位置付けられた絶縁部材７０Ａを有して成ることが好ましい。 In one aspect, 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.
　図６は、負極の未塗工部と正極に供した絶縁部材とが相互に対向する態様を模式的に示した分解斜視図である。 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.
　図６に示す態様では、図５に示す態様と同様に切欠き領域３０Ａ内における正極集電体１１Ａの主要部１１Ａαの側部に正極側引出しタブ２０Ａが位置付けられ、切欠き領域３０Ａ以外の領域における正極集電体１１Ａの主要部１１Ａαの側部に正極側接続タブ４０Ａが位置付けられている。正極集電体１１Ａの一方の側には正極材層１２Ａが一面に塗工されている一方、正極集電体１１Ａの他方の側には平面視で正極材層１２Ａ（塗工部に相当）が未塗工部６０Ａを挟んで両側に塗工されている。正極１０Ａの未塗工部６０Ａは、平面視にて正極側引出しタブ２０Ａと正極集電体１１Ａの主要部１１Ａαとを露出させるように一方向に延在している。当該露出した正極集電体１１Ａの主要部１１Ａα上における未塗工部６０Ａの幅寸法Ｗ１は、正極側引出しタブ２０Ａ上における未塗工部６０Ａの幅寸法Ｗ２より大きい。又、図６に示す態様では、図５に示す態様と同様に負極１０Ｂは、切欠き領域３０Ｂ内に位置付けられた負極側引出しタブ２０Ｂおよび切欠き領域３０Ｂ以外の領域に位置付けられた接続タブ４０Ｂを備えている。具体的には、本態様では、切欠き領域３０Ｂ内における負極集電体１１Ｂの主要部１１Ｂαの側部に負極側引出しタブ２０Ｂが位置付けられ、切欠き領域３０Ｂ以外の領域における負極集電体１１Ｂの主要部１１Ｂαの側部に負極側接続タブ４０Ｂが位置付けられている。 In the aspect shown in FIG. 6, the positive electrode side extraction tab 20A is positioned on the side of the main part 11Aα 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 11Aα of the positive electrode current collector 11A. On one side 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 11Aα of the positive electrode current collector 11A in plan view. Uncoated portion 60A width W 1 of the on the main unit 11Aα 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. In the embodiment shown in FIG. 6, 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. Specifically, in this embodiment, the negative electrode extraction tab 20B is positioned on the side of the main part 11Bα 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 11Bα.
　一方、図６に示す態様では、図５に示す態様と異なり、絶縁部材７０Ａが正極１０Ａの集電体１１Ａの主要部１１Ａα上又は正極材層１２Ａ上に供されている。当該絶縁部材７０Ａは、図６に示すようにセパレータ５０を介して正極１０Ａと負極１０Ｂとを積層した際に負極１０Ｂの未塗工部６０Ｂと対向するように位置付けられることが好ましい。かかる位置付けにより、セパレータ５０を介して正極１０Ａと負極１０Ｂとを積層した際に、負極１０Ｂの未塗工部６０Ｂにリチウムが析出することを防止することが可能となる。なお、当該リチウム析出を好適に防止する観点から、積層方向に沿って対向配置される絶縁部材７０Ａと負極１０Ｂの未塗工部６０Ｂとの幅寸法（Ｗ３）は略同一であることがより好ましい。 On the other hand, in the embodiment shown in FIG. 6, unlike the embodiment shown in FIG. 5, the insulating member 70A is provided on the main part 11Aα 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. In addition, from the viewpoint of suitably preventing the lithium deposition, 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.
　ここで、未塗工部６０Ｂを負極集電体１１Ｂの両側（両主面側）に形成する場合、両側に形成した未塗工部６０Ｂにリチウムが析出することを防止する観点から、負極集電体１１Ｂの両側に形成した未塗工部６０Ｂに絶縁部材７０Ａをそれぞれ対向配置する必要がある。従って、絶縁部材７０Ａを設ける回数を減じる観点、すなわち、絶縁部材７０Ａの設置効率を向上させる観点から、未塗工部６０Ｂを有する負極材層１２Ｂは負極集電体１１Ｂの一方の側（一方の主面側）にのみ形成されることが好ましい。 Here, 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).
［本発明の二次電池の製造方法］ [Method for Manufacturing Secondary Battery of the Present Invention]
　以下、本発明の一実施形態に係る二次電池の製造方法について説明する。 Hereinafter, a method for manufacturing a secondary battery according to an embodiment of the present invention will be described.
　本願発明者らは、複数の電極１０’の各々の引出しタブ２０’を切欠き領域３０’内に全て位置付ける態様では、平面視にて切欠き領域を有する平面積層構造の電極組立体の生産効率が低下するという技術的課題を解決するため、鋭意検討し、本発明の一実施形態に係る二次電池の製造方法を案出するに至った。具体的には、本願発明者らは、複数の電極１０’の各々の引出しタブ２０’を切欠き領域３０’内に全て位置付けるのではなく、複数の電極のうちの一部の電極の引出しタブのみを切欠き領域に位置付けるという新たな対応を案出するに至った。すなわち、本願発明者らは、切欠き領域内に位置付ける引出しタブの数を可能な限り減じるという技術的思想に基づき、本発明を案出するに至った。 In the embodiment in which the respective extraction tabs 20 ′ of the plurality of electrodes 10 ′ are all positioned in the cutout region 30 ′, 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. In order to solve the technical problem of lowering, 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.
　図７は、切欠き領域を備えた電極組立体の製造方法を示す模式図である。 FIG. 7 is a schematic view showing a method for manufacturing an electrode assembly having a notch region.
　本発明の一実施形態は、平面積層構造を有しかつ平面視で切欠き領域３０を有する電極組立体１００を製造するに際して、複数の電極１０（正極１０Ａおよび/または負極１０Ｂ）のうち引出しタブ２０と接続タブ４０とを有する一部の電極１０Ｘを形成する工程を含み、および、平面視にて当該引出しタブ２０を切欠き領域３０に位置付け、接続タブ４０を切欠き領域３０以外の領域に位置付けることを最大の特徴とする。 In one embodiment of the present invention, when manufacturing the electrode assembly 100 having a planar laminated structure and having the cutout region 30 in plan view, 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.
　引出しタブ２０と接続タブ４０とを有する電極１０Ｘは、主として以下の工程を経て得られる（図８参照）。 The electrode 10X having the extraction tab 20 and the connection tab 40 is obtained mainly through the following steps (see FIG. 8).
　まず、集電体１１（金属箔）を準備する（図８（ｉ）参照）。集電体１１を準備した後、集電体１１（金属箔）上に電極材層１２を一面に塗工する（図８（ｉｉ）参照）。電極材層１２を一面に塗工した後、パンチングにより引出しタブ前駆体２０α（後刻に形成される引出しタブ２０上に電極材層が塗工されたものに相当）を切欠き領域３０内に有し、かつ接続タブ前駆体４０α（後刻に形成される接続タブ４０上に電極材層が塗工されたものに相当）を切欠き領域３０内に有する電極を形成する（図８（ｉｉｉ）参照）。次いで、引出しタブ前駆体２０αおよび接続タブ前駆体４０αにおける電極材層１２を光ビーム等により除去する（図示せず）。以上により、切欠き領域３０内に引出しタブ２０を有し、切欠き領域３０以外の領域内に接続タブ４０を有する電極１０が得られる（図８（ｖ）参照）。 First, a current collector 11 (metal foil) is prepared (see FIG. 8 (i)). After the current collector 11 is prepared, the electrode material layer 12 is applied over the current collector 11 (metal foil) (see FIG. 8 (ii)). After coating the electrode material layer 12 over the entire surface, the punch tab precursor 20α (corresponding to the electrode tab coated on the drawer tab 20 formed later) is formed in the notch region 30 by punching. In addition, an electrode having a connection tab precursor 40α (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)). ). Next, the electrode material layer 12 in the extraction tab precursor 20α and the connection tab precursor 40α is removed by a light beam or the like (not shown). Thus, 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)).
　上述のように、本発明の一実施形態では、複数の電極の各々の引出しタブを全て切欠き領域３０内に位置付けるのではなく、複数の電極１０のうちの「一部」の電極１０Ｘの引出しタブ２０を切欠き領域３０内に位置付ける。 As described above, in one embodiment of the present invention, 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.
　かかる特徴を有することにより、切欠き領域３０内に引出しタブ２０を含む複数の電極１０を形成するに際して、集電体１１（金属箔）に電極材層１２を一面に塗工し、パンチングにより所定形状の切欠き領域を有する電極１０を形成した後、引出しタブ前駆体（後刻に形成される引出しタブ２０上に電極材層１２が塗工されたものに相当）における電極材層１２を光ビーム等によりその都度除去する必要がない。つまり、複数の電極１０のうちの「一部」の電極１０Ｘの引出しタブ２０を切欠き領域３０内に位置付けるため、複数の電極１０の「全て」の各引出しタブ２０を切欠き領域３０内に位置付ける場合と比べて、製造途中で引出しタブ前駆体における電極材層１２を光ビーム等により除去する回数を減じることができる。当該切欠き領域３０内における引出しタブ前駆体からの電極材層１２の除去回数の低減により、平面視にて切欠き領域３０を有する平面積層構造の電極組立体１００の製造時間を相対的に短縮することができる。つまり、切欠き領域３０を有する平面積層構造の電極組立体１００の生産効率の低減を抑制することができる。従って、最終的に切欠き領域を有する二次電池を効率的に得ることができる。 With this feature, when forming the plurality of electrodes 10 including the extraction tabs 20 in the notch region 30, the electrode material layer 12 is applied to the current collector 11 (metal foil) over the entire surface, and predetermined by punching. After forming the electrode 10 having a cut-out region of the shape, 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. Compared with the case where it positions, the frequency | 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. By reducing the number of removals of the electrode material layer 12 from the extraction tab precursor in the cutout region 30, 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.
　本発明の一実施形態に係る二次電池の製造方法は、下記態様を採ることが好ましい。 The method for manufacturing a secondary battery according to an embodiment of the present invention preferably adopts the following aspect.
　一態様では、接続タブ４０のみを有する電極（正極１０Ａおよび/または負極１０Ｂ）を形成する工程を更に含み、平面視にて接続タブ４０を切欠き領域３０以外の領域に位置付けることが好ましい。 In one aspect, it is preferable that 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.
　上述のように、本発明の一実施形態は、複数の電極１０のうちの一部の電極１０Ｘの引出しタブ２０のみを切欠き領域３０内に位置付けることを特徴とする。そのため、平面視で切欠き領域３０内に引出しタブ２０を有しない電極が存在する。 As described above, 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.
　そこで、当該引出しタブ２０を含む電極と、当該引出しタブ２０を有しない電極とを含む電極組立体１００を全体として電気的に接続可能とするために、引出しタブ２０を有しないものの接続タブ４０を有する電極１０Ｙを製造する。具体的には、切欠き領域３０以外の領域に接続タブ４０が位置付けられるように電極１０Ｙを製造する。 Therefore, in order to electrically connect the electrode assembly 100 including the electrode including the extraction tab 20 and the electrode not including the extraction tab 20 as a whole, the 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.
　接続タブ４０のみを有する電極１０Ｙは、主として以下の工程を経て得られる。 The electrode 10Y having only the connection tab 40 is obtained mainly through the following steps.
　まず、集電体（金属箔）を準備する。集電体を準備した後、集電体（金属箔）上に電極材層１２を一面に塗工する。電極材層１２を一面に塗工した後、パンチングにより接続タブ前駆体（後刻に形成される接続タブ４０上に電極材層が塗工されたものに相当）を切欠き領域３０以外の領域内に有する電極を形成する。次いで、接続タブ前駆体における電極材層１２を光ビーム等により除去する。以上により、切欠き領域３０以外の領域内に接続タブ４０を有する電極１０Ｙが得られる。 First, prepare a current collector (metal foil). After preparing the current collector, the electrode material layer 12 is applied over the current collector (metal foil). After coating the electrode material layer 12 over the entire surface, 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. Next, the electrode material layer 12 in the connection tab precursor is removed by a light beam or the like. Thus, the electrode 10Y having the connection tab 40 in a region other than the notch region 30 is obtained.
　そして、所望の数の複数の電極１０のうちの「一部」の電極として電極１０Ｘを選択し、所望の枚数の複数の電極１０のうちの残りの電極として電極１０Ｙを選択した後、当該電極１０Ｘと電極１０Ｙとをセパレータ５０を介して積層させる。積層後、各接続タブ４０を１つに束ねて接続部を形成することによって、積層した電極同士が電気的に接続された電極組立体１００が得られる。 Then, the electrode 10X is selected as the “partial” electrode among the desired number of the plurality of electrodes 10, and 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. After lamination, 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.
　当該電極組立体１００を製造した後、平面視で電極組立体１００の切欠き形状に対応した切欠き領域を有する外装体内に、電極組立体１００と電解液を封入する。以上により、最終的に本発明の一実施形態に係る二次電池の製造が完了する。 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.
　一態様では、集電体に、活物質が塗工された塗工部１２αと、活物質が局所的に塗工されていない未塗工部６０とを形成し、未塗工部６０が塗工部１２α間に挟み込まれかつ引出しタブ２０を設置する部分および集電体１１の主要部１１αを露出させるように、平面視にて未塗工部６０を一方向に形成することが好ましい。 In one embodiment, the current collector is formed with a coated part 12α 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 12α and where the drawer tab 20 is installed and the main portion 11α of the current collector 11.
　図９Ａは、平面視にて引出しタブと集電体の主要部とを露出させるように一方向に延在する未塗工部を含む電極を備えた電極組立体の製造方法を示す模式図である。 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.
　上述のように、本発明の一実施形態は、複数の電極１０のうちの「一部」の電極１０Ｘの引出しタブ２０を切欠き領域３０内に位置付けることを特徴とする（図７参照）。当該引出しタブ２０を形成する方法としては、製造途中で引出しタブ前駆体２０α（図８（ｉｉｉ）参照）における電極材層を光ビーム等により除去することが一例として挙げられる。しかしながら、引出しタブ前駆体２０αにおける電極材層を、所望の引出しタブ２０のみが露出するように光ビーム等の照射により好適に除去できない可能性があり得る。 As described above, 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 20α (see FIG. 8 (iii)) with a light beam or the like during the production. However, the electrode material layer in the extraction tab precursor 20α may not be suitably removed by irradiation with a light beam or the like so that only the desired extraction tab 20 is exposed.
　そこで、本態様では、平面視にて引出しタブ２０を設置する部分と集電体の主要部１１αとを露出させるように一方向に延在する未塗工部６０（電極材層を塗工しない部分に相当）を、集電体に電極材層を塗工する際に一方の塗工部１２α（電極材層に相当）と他方の塗工部１２αとの間に意図的に形成し、最終的に未塗工部６０を備えた電極１０Ｘ１を得る。電極１０Ｘ１の未塗工部６０は、集電体に電極材層を塗工する際に、意図的に塗工部間に電極材層を塗工しない部分であって、製造途中で引出しタブ前駆体における電極材層を光ビーム等により後刻に除去して得るものではない。そのため、引出しタブ前駆体における電極材層を、所望の引出しタブ２０のみが露出するように光ビーム等の照射により好適に除去できない可能性を排除することができる。 Therefore, in this aspect, 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 11α of the current collector in a plan view. Is equivalently formed between one coating portion 12α (corresponding to the electrode material layer) and the other coating portion 12α 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.
　詳細には、未塗工部６０を備えた電極１０Ｘ１は、主として以下の工程を経て得られる。 Specifically, the electrode 10X 1 having the uncoated portion 60 is obtained mainly through the following steps.
　図９Ｂに示すように、まず、集電体１１（金属箔）を準備する。集電体１１を準備した後、コーター８０等を用いて集電体１１（金属箔）上に電極材層１２を塗工する。具体的には、引出しタブ２０を設置する部分２０βと集電体の主要部１１αとが露出されるように、複数の未塗工部６０（すなわち、電極材層１２を塗工しない部分）を所定の間隔で、平面視で一方の塗工部１２αと他方の塗工部１２αとの間に形成する。未塗工部６０が形成されるように電極材層１２を塗工した後、パンチングにより切欠き領域３０内に引出しタブ２０を有し、かつ接続タブ前駆体（後刻に形成される接続タブ４０上に電極材層が塗工されたものに相当）を切欠き領域３０以外の領域内に有する電極を形成する。次いで、接続タブ前駆体における電極材層１２を光ビーム等により除去する。以上により、未塗工部６０を備えた電極１０Ｘ１が得られる。 As shown in FIG. 9B, first, a current collector 11 (metal foil) is prepared. After the current collector 11 is prepared, the electrode material layer 12 is applied on the current collector 11 (metal foil) using a coater 80 or the like. Specifically, a plurality of uncoated portions 60 (that is, portions where the electrode material layer 12 is not applied) are provided so that the portion 20β where the drawer tab 20 is installed and the main portion 11α of the current collector are exposed. At a predetermined interval, it is formed between one coating portion 12α and the other coating portion 12α in plan view. After the electrode material layer 12 is applied so that the uncoated portion 60 is formed, 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. Next, the electrode material layer 12 in the connection tab precursor is removed by a light beam or the like. Thus, the electrode 10X 1 is obtained with the uncoated portions 60.
　そして、所望の数の複数の電極１０のうちの「一部」の電極として電極１０Ｘ１を選択し、所望の枚数の複数の電極１０のうちの残りの電極として接続タブ４０のみを有する電極１０Ｙを選択した後、当該電極１０Ｘ１と電極１０Ｙとをセパレータ５０を介して積層させる。積層後、各接続タブ４０を１つに束ねて接続部を形成することによって、積層した電極同士が電気的に接続された電極組立体１００が得られる。 Then, select the electrodes 10X 1 as an electrode of the "portion", the electrode 10Y having only connection tab 40 as the remaining of the plurality of electrodes 10 of a desired number of the plurality of electrodes 10 a desired number after selecting, to stack and the electrode 10X 1 and the electrode 10Y via the separator 50. After lamination, 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.
　一態様では、未塗工部６０が接続タブ４０を設置する部分を更に露出させるように、平面視にて未塗工部を一方向に形成することが好ましい。 In one aspect, it is preferable to form 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.
　図１０は、平面視にて引出しタブと接続タブとを集電体の主要部を挟んで相互に対向させるように一方向に延在する未塗工部を含む電極を備えた電極組立体の製造方法を示す模式図である。 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.
　上述のように、本発明の一実施形態では、引出しタブおよび接続タブを有する電極と、接続タブのみを有する電極との組合せから電極組立体の複数の電極を構成している。接続タブの形成方法としては、上述のように製造途中で接続タブ前駆体（後刻に形成される接続タブ上に電極材層が塗工されたものに相当）における電極材層を光ビーム等により除去することが挙げられる。しかしながら、引出しタブおよび接続タブを有する電極を製造するに際して、切欠き領域以外の領域の集電体の主要部の側部の任意の箇所に接続タブを設ける場合、製造途中で引出しタブ前駆体における電極材層を除去する工程と、接続タブ前駆体における電極材層を除去する工程とを異なる時間帯で行う必要があり得る。つまり、引出しタブの形成工程とは別工程で接続タブを形成する必要があり、接続タブの生産効率が高いとは言えない可能性があり得る。 As described above, in one embodiment of the present invention, 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. As a method of forming the connection tab, as described above, 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. However, 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.
　そこで、本態様では、平面視にて、引出しタブ２０を設置する部分、集電体１１の主要部１１α、および接続タブ４０を設置する部分をそれぞれ露出させるように一方向に延在する未塗工部６０を、一方の塗工部１２αと他方の塗工部１２αとの間に意図的に形成して、最終的に未塗工部６０を備えた電極１０Ｘ２を得る。本態様では、引出しタブ２０、集電体１１の主要部１１α、および接続タブ４０をそれぞれ露出させるように一方向に延在する未塗工部６０を形成するため、製造途中で引出しタブ前駆体における電極材層を除去する工程と、接続タブ前駆体における電極材層を除去する工程とを異なる時間帯で行う必要がない。従って、引出しタブ２０の形成工程とは別工程で接続タブ４０を形成する必要がないため、各タブの生産効率を向上させることが可能となる。 Therefore, in this aspect, in a plan view, the portion where the drawer tab 20 is installed, the main portion 11α 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 &alpha; and the other coating unit 12 &alpha;, to finally obtain the electrode 10X 2 having a non-coated portion 60. In this embodiment, since the undrawn portion 60 extending in one direction so as to expose the drawer tab 20, the main part 11α of the current collector 11, and the connection tab 40 is formed, the drawer tab precursor is formed during the production. 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.
　詳細には、未塗工部６０を備えた電極１０Ｘ２は、主として以下の工程を経て得られる。 Specifically, the electrode 10X 2 having a non-coated portion 60 is obtained mainly through the following steps.
　図１０Ａに示すように、まず、集電体１１（金属箔）を準備する。集電体１１を準備した後、集電体１１（金属箔）上に電極材層１２を塗工する。具体的には、引出しタブ２０を設置する部分２０βと集電体の主要部１１αと接続タブ４０を設置する部分４０βとが露出されるように、複数の未塗工部６０（すなわち、電極材層１２を塗工しない部分）を所定の間隔で、平面視で一方の塗工部１２αと他方の塗工部１２αとの間に形成する。未塗工部６０が形成されるように電極材層１２を塗工した後、パンチングにより切欠き領域３０内に引出しタブ２０を有し、かつ接続タブ４０を切欠き領域３０以外の領域内に有する電極を形成する。これにより、未塗工部６０を備えた電極１０Ｘ２が得られる。 As shown in FIG. 10A, first, a current collector 11 (metal foil) is prepared. After the current collector 11 is prepared, the electrode material layer 12 is applied on the current collector 11 (metal foil). Specifically, a plurality of uncoated portions 60 (that is, electrode materials) are exposed so that the portion 20β where the drawer tab 20 is installed, the main portion 11α of the current collector, and the portion 40β where the connection tab 40 is installed are exposed. A portion where the layer 12 is not applied) is formed at a predetermined interval between the one coating portion 12α and the other coating portion 12α in plan view. After the electrode material layer 12 is applied so that the uncoated portion 60 is formed, 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. Thus, the electrode 10X 2 having a non-coated portion 60 is obtained.
　そして、所望の数の複数の電極１０のうちの「一部」の電極として電極１０Ｘ２を選択し、所望の枚数の複数の電極１０のうちの残りの電極として接続タブ４０のみを有する電極１０Ｙを選択した後、当該電極１０Ｘ２と電極１０Ｙとをセパレータ５０を介して積層させる。積層後、各接続タブ４０を１つに束ねて接続部を形成することによって、積層した電極同士が電気的に接続された電極組立体１００が得られる。 Then, select the electrodes 10X 2 as electrodes for "portion", the electrode 10Y having only connection tab 40 as the remaining of the plurality of electrodes 10 of a desired number of the plurality of electrodes 10 a desired number after selecting, to stack and the electrode 10X 2 and the electrode 10Y via the separator 50. After lamination, 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.
　なお、本態様は、タブの生産効率の向上の観点から引出しタブおよび接続タブを例えば光ビーム等を用いること無しに形成することを特徴とするため、図１０Ａに示す態様に限定されることなく、以下に示す塗工態様を採ってもよい。 Note that 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.
　特に限定されるものではないが、例えば図１０Ｂに示す塗工態様を採ってよい。当該塗工態様では、図１０Ａに示す態様（平面視で縦方向）と異なり、引出しタブ２０を設置する部分２０βと集電体の主要部１１αと接続タブ４０を設置する部分４０βとが露出されるように、平面視で横方向に複数の未塗工部６０（すなわち、電極材層１２を塗工しない部分）を一方の塗工部１２αと他方の塗工部１２αとの間に形成する。つまり、未塗工部６０の塗工方向が限定されないことを意味する。 Although not particularly limited, for example, a coating mode shown in FIG. 10B may be adopted. In the coating mode, unlike the mode shown in FIG. 10A (vertical direction in plan view), the part 20β where the drawer tab 20 is installed, the main part 11α of the current collector, and the part 40β where the connection tab 40 is installed are exposed. As shown, a plurality of uncoated portions 60 (that is, portions where the electrode material layer 12 is not applied) are formed between one coated portion 12α and the other coated portion 12α in the lateral direction in plan view. . That is, it means that the coating direction of the uncoated portion 60 is not limited.
　特に限定されるものではないが、例えば図１０Ｃに示す塗工態様を採ってよい。当該塗工態様では、図１０Ａおよび図１０Ｂに示す態様と異なり、未塗工部６０が形成されるように電極材層１２を塗工した後に行うパンチングの方法に特徴を有する。具体的には、各電極の切欠き領域３０を相互に有効活用して、切欠き領域３０を有する電極として用いられない部分が可能な限り減じられるようにパンチングを行うことを特徴とする。 Although not particularly limited, for example, a coating mode shown in FIG. 10C may be adopted. Unlike the aspect shown to FIG. 10A and FIG. 10B, 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.
　特に限定されるものではないが、例えば図１０Ｄに示す塗工態様を採ってよい。当該塗工態様では、図１０Ａ～図１０Ｃに示す態様と異なり、引出しタブ２０を設置する部分２０βと集電体の主要部１１αと接続タブ４０を設置する部分４０βとが露出されるように、平面視で縦横方向に複数の未塗工部６０（すなわち、電極材層１２を塗工しない部分）を塗工部１２α間に形成する。かかる塗工態様を採れば、平面視で縦横方向に複数の未塗工部６０が形成されることに起因して光ビーム等を用いること無しに形成可能な接続タブの配置可能な箇所を増やすことができる。 Although not particularly limited, for example, the coating mode shown in FIG. 10D may be adopted. In the coating mode, unlike the mode shown in FIGS. 10A to 10C, the portion 20β where the drawer tab 20 is installed, the main portion 11α of the current collector, and the portion 40β 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 12α in the vertical and horizontal directions in plan view. By adopting such a coating mode, the number of places where connection tabs that can be formed without using a light beam or the like due to the formation of a plurality of uncoated portions 60 in the vertical and horizontal directions in plan view is increased. be able to.
　一態様では、負極の未塗工部と正極の未塗工部とが断面視にて相互に対向するように、正極および負極を積層方向に沿ってそれぞれ位置付けることが好ましい（図５参照）。 In one embodiment, 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).
　具体的には、図５に示すように、セパレータ５０を介して正極１０Ａと負極１０Ｂとを積層した際に、負極１０Ｂの未塗工部６０Ｂにリチウムが析出することを防止する観点から、正極１０Ａにも負極１０Ｂの未塗工部６０Ｂに積層方向に沿って対向配置される未塗工部６０Ａを設けることが好ましい。 Specifically, as shown in FIG. 5, when 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.
　なお、未塗工部６０Ｂを負極集電体１１Ｂの両側（両主面側）に形成する場合、両側に形成した未塗工部６０Ｂにリチウムが析出することを防止する観点から、正極１０Ａの未塗工部６０Ａを、負極集電体１１Ｂの両側（両主面側）に形成した未塗工部６０Ｂにそれぞれ対向配置する必要がある。従って、正極１０Ａの未塗工部６０Ａの形成回数を減じる観点、すなわち未塗工部６０Ａを有する正極１０Ａの生産効率を向上させる観点から、未塗工部６０Ｂを有する負極材層１２Ｂを負極集電体１１Ｂの一方の側（一方の主面側）にのみ形成することが好ましい。 In addition, when forming the uncoated part 60B 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 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.
　一態様では、絶縁部材を更に有して成る正極を形成し、断面視にて負極の未塗工部に対向する部分に絶縁部材を位置付けることが好ましい（図６参照）。 In one embodiment, it is preferable to form 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).
　図６に示す態様では、図５に示す態様と異なり、絶縁部材７０Ａを正極１０Ａの集電体１１Ａの主要部１１Ａα上又は正極材層１２Ａ上に供する。具体的には、当該絶縁部材７０Ａを、図６に示すようにセパレータ５０を介して正極１０Ａと負極１０Ｂとを積層した際に負極１０Ｂの未塗工部６０Ｂと対向するように位置付けることが好ましい。かかる位置付けにより、セパレータ５０を介して正極１０Ａと負極１０Ｂとを積層した際に、負極１０Ｂの未塗工部６０Ｂにリチウムが析出することを防止することが可能となる。 In the embodiment shown in FIG. 6, unlike the embodiment shown in FIG. 5, the insulating member 70A is provided on the main part 11Aα 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.
　なお、未塗工部６０Ｂを負極集電体１１Ｂの両側（両主面側）に形成する場合、両側に形成した未塗工部６０Ｂにリチウムが析出することを防止する観点から、負極集電体１１Ｂの両側（両主面側）に形成した未塗工部６０Ｂに絶縁部材７０Ａをそれぞれ対向配置する必要がある。従って、絶縁部材７０Ａを設ける回数を減じる観点、すなわち、絶縁部材７０Ａの設置効率を向上させる観点から、未塗工部６０Ｂを有する負極材層１２Ｂを負極集電体１１Ｂの一方の側（一方の主面側）にのみ形成することが好ましい。 In addition, when forming the uncoated part 60B in the both sides (both main surface side) of the negative electrode collector 11B, from a viewpoint of preventing that lithium precipitates in the uncoated part 60B formed in both sides, 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).
　上記では、好ましい態様として未塗工部を形成する態様に基づき主として説明してきた。しかしながら、これに限定されることなく、一態様では、スクリーン印刷により、断面視にて集電体の主要部上の全体に活物質から成る電極材層を形成し、それによって引出しタブおよび接続タブを有する電極を形成してよい。 In the above description, the preferred embodiment has been mainly described based on an embodiment in which an uncoated portion is formed. However, the present invention is not limited thereto, and in one aspect, 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.
　本態様は、スクリーン印刷により、引出しタブおよび接続タブを除いて集電体の主要部上にのみ全体にわたって電極材層を形成することを特徴とする。本態様では、電極材層を集電体の主要部上にのみ形成するため、上述の連続塗工を行う場合と比べて、不必要な電極材層が発生しにくい点で有利である。 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. In this aspect, since 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.
　本発明の一実施形態に係る二次電池は、蓄電が想定される様々な分野に利用することができる。あくまでも例示にすぎないが、本発明の一実施形態に係る二次電池、特に非水電解質二次電池は、モバイル機器などが使用される電気・情報・通信分野（例えば、携帯電話、スマートフォン、ノートパソコンおよびデジタルカメラ、活動量計、アームコンピューター、電子ペーパーなどのモバイル機器分野）、家庭・小型産業用途（例えば、電動工具、ゴルフカート、家庭用・介護用・産業用ロボットの分野）、大型産業用途（例えば、フォークリフト、エレベーター、湾港クレーンの分野）、交通システム分野（例えば、ハイブリッド車、電気自動車、バス、電車、電動アシスト自転車、電動二輪車などの分野）、電力系統用途（例えば、各種発電、ロードコンディショナー、スマートグリッド、一般家庭設置型蓄電システムなどの分野）、ならびに、ＩｏＴ分野、宇宙・深海用途（例えば、宇宙探査機、潜水調査船などの分野）などに利用することができる。 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) , Road conditioners, smart grids, general home storage systems, etc.) As well as, it is possible to use IoT field, space and deep sea applications (for example, spacecraft, areas such as submersible research vessel) and the like.
１００　電極組立体，１０　電極，１０Ｘ、１０Ｘ１、１０Ｘ２　引出しタブおよび接続タブを有する電極，１０Ｙ　接続タブのみを有する電極，１０Ａ　正極，１０Ｂ　負極，１１　集電体，１１Ａ　正極集電体，１１Ｂ　負極集電体，１１α、１１Ａα、１１Ｂα　集電体の主要部，１２　電極材層（活物質層），１２Ａ　正極材層，１２Ｂ　負極材層，１２α　塗工部，２０、２０Ａ、２０Ｂ　引出しタブ，２０α　引出しタブ前駆体，２０β　引出しタブを設置する部分，３０、３０Ａ、３０Ｂ　切欠き領域，４０、４０Ａ、４０Ｂ　接続タブ，４０α　接続タブ前駆体，４０β　接続タブを設置する部分，５０　セパレータ，６０、６０Ａ、６０Ｂ　未塗工部，７０Ａ　絶縁部材，８０　コーター，Ｗ１　露出した正極集電体の主要部上における未塗工部の幅寸法，Ｗ２　正極側引出しタブ上における未塗工部の幅寸法，Ｗ３　露出した負極集電体の主要部上における未塗工部の幅寸法，１０’　電極，１１’　集電体（金属箔），１２’　電極材層，２０’　引出しタブ，２０α’　引出しタブ前駆体，Ｌ　光ビーム，３０’　切欠き領域，４０α’　接続タブ前駆体 100 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, 11α, 11Aα, 11Bα Main part of current collector, 12 electrode material layer (active material layer), 12A positive electrode material layer, 12B negative electrode material layer, 12α coating portion, 20, 20A, 20B Drawer tab, 20α drawer tab precursor, 20β drawer tab installation portion, 30, 30A, 30B cutout region, 40, 40A, 40B connection tab, 40α connection tab precursor, 40β 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 'electrodes, 11' collector (metal foil), 12 ' Electrode material layer, 20 'extraction tab, 20α' extraction tab precursor, L light beam, 30 'notch region, 40α' connection tab precursor

Claims (21)

  1. 　正極、負極および該正極と該負極との間に配置されたセパレータを含む電極組立体と、電解質とが外装体に収容された二次電池であって、
    　前記電極組立体が、前記正極、前記負極および前記セパレータを含む複数の電極ユニットを平面状に積層した平面積層構造を有し、かつ、平面視にて切欠き領域を有して成り、
    　複数の前記正極のうちの一部の該正極および複数の前記負極のうちの一部の該負極の少なくとも一方が、引出しタブおよび接続タブを有し、
    　前記引出しタブが平面視にて前記切欠き領域に位置付けられており、および前記接続タブが平面視にて該切欠き領域以外の領域に位置付けられている、二次電池。     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 the positive electrode, the negative electrode, and the separator are laminated in a planar shape, and has a notch region in plan view,
    At least one of a part of the positive electrodes of the plurality of positive electrodes and a part of the negative electrodes of the plurality of negative electrodes has an extraction tab and a connection tab,
    The secondary battery, wherein the drawer tab is positioned in the cutout region in plan view, and the connection tab is positioned in a region other than the cutout region in plan view.
  2. 　１つのみの前記正極および１つのみの前記負極の少なくとも一方が、前記引出しタブおよび前記接続タブを有する、請求項１に記載の二次電池。 2. The secondary battery according to claim 1, wherein at least one of only one of the positive electrodes and only one of the negative electrodes has the extraction tab and the connection tab.
  3. 　前記接続タブのみを有する前記正極および前記接続タブのみを有する前記負極の少なくとも一方を更に有し、該接続タブが前記切欠き領域以外の前記領域に位置付けられている、請求項１又は２に記載の二次電池。 3. The apparatus according to claim 1, further comprising at least one of the positive electrode having only the connection tab and the negative electrode having only the connection tab, wherein the connection tab is positioned in the region other than the notch region. Secondary battery.
  4. 　前記切欠き領域に位置付けられた前記引出しタブが外部端子と電気的に接続されている、請求項１～３のいずれかに記載の二次電池。 The secondary battery according to any one of claims 1 to 3, wherein the drawer tab positioned in the notch region is electrically connected to an external terminal.
  5. 　前記引出しタブおよび前記接続タブを有する前記正極と前記引出しタブおよび前記接続タブを有する前記負極の少なくとも一方は、断面視にて集電体に活物質が塗工された塗工部および該活物質が局所的に塗工されていない未塗工部を有し、並びに
    　前記未塗工部が、平面視にて前記引出しタブと前記集電体の主要部とを露出させるように、一方向に延在している、請求項１～４のいずれかに記載の二次電池。     At least one of the positive electrode having the extraction tab and the connection tab and the negative electrode having the extraction tab and the connection tab is a coated portion in which an active material is coated on the current collector in a cross-sectional view, and the active material Has an uncoated portion that is not locally coated, and the uncoated portion is unidirectionally exposed so as to expose the drawer tab and the main portion of the current collector in plan view. The secondary battery according to any one of claims 1 to 4, wherein the secondary battery is extended.
  6. 　前記一方向に延在している前記未塗工部において、平面視にて前記引出しタブと前記接続タブとが前記集電体の前記主要部を挟んで相互に対向している、請求項５に記載の二次電池。 The uncoated portion extending in the one direction has the drawer tab and the connection tab facing each other across the main portion of the current collector in a plan view. Secondary battery described in 1.
  7. 　前記引出しタブおよび前記接続タブを有する前記負極の前記未塗工部と、前記引出しタブおよび前記接続タブを有する前記正極の前記未塗工部とが、断面視にて相互に対向するように位置付けられている、請求項５又は６に記載の二次電池。 The uncoated portion of the negative electrode having the extraction tab and the connection tab and the uncoated portion of the positive electrode having the extraction tab and the connection tab are positioned so as to face each other in a cross-sectional view. The secondary battery according to claim 5 or 6, wherein
  8. 　前記引出しタブおよび前記接続タブを有する前記正極は、断面視にて前記負極の前記未塗工部に対向するように位置付けられた絶縁部材を有して成る、請求項５又は６に記載の二次電池。 The said positive electrode which has the said drawer | drawing-out tab and the said connection tab has an insulating member located so that the said uncoated part of the said negative electrode may be opposed in a cross sectional view, The two of Claim 5 or 6 Next battery.
  9. 　前記引出しタブおよび前記接続タブを有する前記負極は、前記集電体の一方の側にのみ前記未塗工部を有する、請求項７又は８に記載の二次電池。 The secondary battery according to claim 7 or 8, wherein the negative electrode having the drawer tab and the connection tab has the uncoated portion only on one side of the current collector.
  10. 　前記正極と前記負極の少なくとも一方が、前記電極組立体の最外層領域に位置付けられ、かつ前記集電体の一方の側にのみ前記塗工部を有する、請求項５～９のいずれかに記載の二次電池。 The at least one of the positive electrode and the negative electrode is positioned in an outermost layer region of the electrode assembly and has the coating portion only on one side of the current collector. Secondary battery.
  11. 　前記引出しタブおよび前記接続タブが前記集電体の一部を成し、かつ該集電体の前記主要部の側部に位置付けられている、請求項５～１０のいずれかに記載の二次電池。 The secondary according to any one of claims 5 to 10, wherein the drawer tab and the connection tab form part of the current collector and are positioned on a side portion of the main portion of the current collector. battery.
  12. 　正極、負極および該正極と該負極との間に配置されたセパレータを含み、かつ平面視にて切欠き領域を有して成る電極組立体と、電解質とが外装体に収容された二次電池の製造方法であって、
    　前記電極組立体は、前記正極、前記負極および前記セパレータを含む複数の電極ユニットを平面状に積層した平面積層構造を有し、
    　複数の前記正極のうちの引出しタブと接続タブとを有する一部の該正極、および複数の前記負極のうち該引出しタブと該接続タブとを有する一部の該負極の少なくとも一方を形成する工程を含み、並びに
    　平面視にて、前記引出しタブを切欠き領域に位置付け、および前記接続タブを該切欠き領域以外の領域に位置付ける、製造方法。     A secondary battery including an electrode assembly including a positive electrode, a negative electrode, and a separator disposed between the positive electrode and the negative electrode, and having a notch region in plan view, and an electrolyte A manufacturing method of
    The electrode assembly has a planar laminated structure in which a plurality of electrode units including the positive electrode, the negative electrode, and the separator are laminated in a planar shape,
    Forming a part of the positive electrode having a lead tab and a connection tab among the plurality of positive electrodes and a part of the negative electrode having the lead tab and the connection tab among the plurality of negative electrodes. And in a plan view, the drawer tab is positioned in a notch region, and the connection tab is positioned in a region other than the notch region.
  13. 　集電体に、活物質が塗工された塗工部と、該活物質が局所的に塗工されていない未塗工部とを形成し、
    　前記未塗工部が塗工部間に挟み込まれ、かつ前記引出しタブを設置する部分および前記集電体の主要部を露出させるように、平面視にて該未塗工部を一方向に形成する、請求項１２に記載の製造方法。     On the current collector, a coated part coated with an active material and an uncoated part where the active material is not locally coated are formed,
    The uncoated part is sandwiched between the coated parts, and the uncoated part is formed in one direction in plan view so as to expose the part where the drawer tab is installed and the main part of the current collector. The manufacturing method according to claim 12.
  14. 　前記未塗工部が前記接続タブを設置する部分を更に露出させるように、平面視にて該未塗工部を前記一方向に形成する、請求項１３に記載の製造方法。　 The manufacturing method according to claim 13, wherein the uncoated portion is formed in the one direction in a plan view so that the uncoated portion further exposes a portion where the connection tab is installed. *
  15. 　前記負極の前記未塗工部と前記正極の前記未塗工部とが断面視にて相互に対向するように、該正極および該負極を積層方向に沿ってそれぞれ位置付ける、請求項１２～１４のいずれかに記載の製造方法。 The positive electrode and the negative electrode are respectively positioned along the laminating 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. The manufacturing method in any one.
  16. 　絶縁部材を更に有して成る前記正極を形成し、
    　断面視にて前記負極の前記未塗工部に対向する部分に前記絶縁部材を位置付ける、請求項１２～１４のいずれかに記載の製造方法。     Forming the positive electrode further comprising an insulating member;
    The manufacturing method according to any one of claims 12 to 14, wherein the insulating member is positioned at a portion of the negative electrode facing the uncoated portion in a cross-sectional view.
  17. 　前記集電体の一方の側にのみ前記未塗工部が形成されるように前記引出しタブおよび前記接続タブを備えた前記負極を形成する、請求項１５又は１６に記載の製造方法。 The manufacturing method according to claim 15 or 16, wherein the negative electrode including the extraction tab and the connection tab is formed so that the uncoated portion is formed only on one side of the current collector.
  18. 　前記集電体の一方の側にのみ前記塗工部を有する前記正極と前記負極の少なくとも一方を、前記電極組立体の最外層領域に位置付ける、請求項１３～１７のいずれかに記載の製造方法。 The manufacturing method according to any one of claims 13 to 17, wherein at least one of the positive electrode and the negative electrode having the coating portion only on one side of the current collector is positioned in an outermost layer region of the electrode assembly. .
  19. 　前記接続タブのみを有する前記正極および前記接続タブのみを有する前記負極の少なくとも一方を形成する工程を更に含み、
    　平面視にて前記接続タブを前記切欠き領域以外の領域に位置付ける、請求項１２～１８のいずれかに記載の製造方法。     Further comprising forming at least one of the positive electrode having only the connection tab and the negative electrode having only the connection tab,
    The manufacturing method according to any one of claims 12 to 18, wherein the connection tab is positioned in a region other than the notch region in a plan view.
  20. 　スクリーン印刷により、断面視にて集電体の主要部上の全体に活物質を含む電極材層を形成し、それによって前記引出しタブおよび前記接続タブを有する前記正極および前記負極の少なくとも一方を形成する、請求項１２に記載の製造方法。 By screen printing, an electrode material layer including an active material is formed on the entire main portion of the current collector in a cross-sectional view, thereby forming at least one of the positive electrode and the negative electrode having the extraction tab and the connection tab. The manufacturing method according to claim 12.
  21. 　前記正極および前記負極がリチウムイオンを吸蔵放出可能な層を有する、請求項１～１１のいずれかに記載の二次電池。 The secondary battery according to any one of claims 1 to 11, wherein the positive electrode and the negative electrode have a layer capable of inserting and extracting lithium ions.
PCT/JP2018/004397 2017-02-24 2018-02-08 Secondary battery and method for producing secondary battery WO2018155210A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2017-033953 2017-02-24
JP2017033953 2017-02-24

Publications (1)

Publication Number Publication Date
WO2018155210A1 true WO2018155210A1 (en) 2018-08-30

Family

ID=63253240

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2018/004397 WO2018155210A1 (en) 2017-02-24 2018-02-08 Secondary battery and method for producing secondary battery

Country Status (1)

Country Link
WO (1) WO2018155210A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2020145052A (en) * 2019-03-05 2020-09-10 株式会社リコー Stacked battery and method for manufacturing stacked battery
JP2022542123A (en) * 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 SECONDARY BATTERY ELECTRODE AND METHOD FOR MANUFACTURING ELECTRODE

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002141055A (en) * 2000-11-06 2002-05-17 Mitsubishi Chemicals Corp Tabular layered battery
WO2016006420A1 (en) * 2014-07-10 2016-01-14 株式会社村田製作所 Method of manufacturing power storage device and method of manufacturing electrode
JP2016506606A (en) * 2013-03-04 2016-03-03 エルジー・ケム・リミテッド Battery cell with missing portion and battery pack including the same

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002141055A (en) * 2000-11-06 2002-05-17 Mitsubishi Chemicals Corp Tabular layered battery
JP2016506606A (en) * 2013-03-04 2016-03-03 エルジー・ケム・リミテッド Battery cell with missing portion and battery pack including the same
WO2016006420A1 (en) * 2014-07-10 2016-01-14 株式会社村田製作所 Method of manufacturing power storage device and method of manufacturing electrode

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2020145052A (en) * 2019-03-05 2020-09-10 株式会社リコー Stacked battery and method for manufacturing stacked battery
JP7334427B2 (en) 2019-03-05 2023-08-29 株式会社リコー LAMINATED BATTERY, METHOD FOR MANUFACTURING LAMINATED BATTERY
JP2022542123A (en) * 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 SECONDARY BATTERY ELECTRODE AND METHOD FOR MANUFACTURING ELECTRODE
JP7250404B2 (en) 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 SECONDARY BATTERY ELECTRODE AND METHOD FOR MANUFACTURING ELECTRODE

Similar Documents

Publication Publication Date Title
US11437653B2 (en) Laminated secondary battery and manufacturing method of the same, and device
US10998600B2 (en) Laminated secondary battery and manufacturing method of the same, and device
JP6879358B2 (en) Secondary battery
WO2018180599A1 (en) Secondary battery
WO2018155210A1 (en) Secondary battery and method for producing secondary battery
JP6841323B2 (en) Secondary battery and its manufacturing method
US11417868B2 (en) Manufacturing method for secondary battery
JPWO2018131346A1 (en) Secondary battery
US11387493B2 (en) Secondary battery
US11411241B2 (en) Secondary battery
WO2018163775A1 (en) Secondary battery production method
JP6885410B2 (en) Secondary battery
WO2017208534A1 (en) Secondary battery
WO2021020212A1 (en) Secondary battery and method for manufacturing same
JPWO2018221318A1 (en) Manufacturing method of secondary battery
JP2018181705A (en) Secondary battery and manufacturing method thereof
JP2018206490A (en) Secondary battery and manufacturing method thereof
WO2018105277A1 (en) Secondary battery
WO2018105278A1 (en) Secondary battery
WO2018100846A1 (en) Secondary battery and device
WO2017208532A1 (en) Secondary battery
JP2018174102A (en) Secondary battery

Legal Events

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

Ref document number: 18756766

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 18756766

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: JP