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WO2019073914A1 - Batterie secondaire et procédé de fabrication de batterie secondaire - Google Patents

Batterie secondaire et procédé de fabrication de batterie secondaire Download PDF

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Publication number
WO2019073914A1
WO2019073914A1 PCT/JP2018/037312 JP2018037312W WO2019073914A1 WO 2019073914 A1 WO2019073914 A1 WO 2019073914A1 JP 2018037312 W JP2018037312 W JP 2018037312W WO 2019073914 A1 WO2019073914 A1 WO 2019073914A1
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Prior art keywords
electrode
separator
curved portion
material layer
current collector
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PCT/JP2018/037312
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English (en)
Japanese (ja)
Inventor
英高 柴田
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Murata Manufacturing Co Ltd
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Murata Manufacturing Co Ltd
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Publication of WO2019073914A1 publication Critical patent/WO2019073914A1/fr
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0583—Construction or manufacture of accumulators with folded construction elements except wound ones, i.e. folded positive or negative electrodes or separators, e.g. with "Z"-shaped electrodes or separators
    • 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
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound 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
    • H01M4/04—Processes of 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
    • 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
    • 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 of manufacturing a secondary battery.
  • secondary batteries capable of repeating charge and discharge have been used for various applications.
  • secondary batteries are used as power sources of electronic devices such as smartphones and notebook computers.
  • Patent Document 1 and Patent Document 2 disclose a single separator-attached electrode in which one electrode and a separator form an integral structure, and at least two other electrodes having different polarities from the one electrode.
  • the secondary battery which combined the is shown.
  • the separator-attached electrode has a generally continuous meandering structure (that is, a zigzag structure) (see Patent Document 1).
  • the separator-attached electrode has a continuous winding structure with respect to at least two other electrodes as a whole (see Patent Document 2).
  • the separator electrode has a generally continuous serpentine structure (i.e., a zigzag structure) and / or has a continuous wound structure with respect to at least two other electrodes as a whole. It has been found that the following problems can occur (see FIG. 10).
  • the separator-equipped electrode 100 ′ has a continuous meandering structure as a whole is taken as an example.
  • the separatored electrode 100 ' due to the separatored electrode 100 'having a serpentine structure, the separatored electrode 100' can locally have a curved portion 101 '. Since the curved portion 101 ′ is in a curved form, due to it, the separator 50 ′ and the electrode (eg, the negative electrode 10B ′), which are components of the separator-equipped electrode 100 ′ located in the curved portion 101 ′, are in a curved form Will have.
  • the layer 12B ') will have a curved form.
  • the electrode material layer for example, the negative electrode material layer 12B '
  • the electrode material layer located in the curved portion 101' has a curved form
  • tensile stress can be generated in the electrode material layer located in the curved part 101 'due to the form.
  • the occurrence of such stress may lead to the occurrence of cracks in the electrode material layer starting from the point of occurrence and / or the local peeling of the electrode material layer. Therefore, there is a possibility that a short circuit may occur at the time of voltage application starting from the cracked portion ⁇ ′ of the electrode material layer and / or the peeled portion of the electrode material layer. Therefore, the electrode provided with the electrode material layer having the cracked portion ⁇ ′ and / or the peeling portion may not function properly as a component of the secondary battery. As a result, there is a possibility that the secondary battery containing the electrode as a whole can not exhibit desired battery characteristics suitably.
  • the main object of the present invention is to provide a secondary battery capable of preferably suppressing local cracking and / or peeling of an electrode material layer in a separator-attached electrode having a curved portion, and a method of manufacturing the same. .
  • a secondary battery comprising: a single separator-provided electrode in which one electrode and a separator form an integral structure; and at least two other electrodes different in polarity from the one electrode.
  • the electrode with a separator alternately has a non-curved portion and a curved portion continuous to the non-curved portion, the non-curved portion and the other electrode are alternately arranged along the stacking direction, and A secondary battery is provided, wherein the curved portion has only the current collector of the one electrode and the separator each curved.
  • a method of manufacturing a secondary battery comprising: a single separator-provided electrode in which one electrode and a separator form an integral structure; and at least two other electrodes different in polarity from the one electrode, Locally bending the elongated electrode with separator;
  • the manufacturing method is provided in which only the current collector of the one electrode and the separator are positioned at a portion where the elongated electrode with a separator is locally bent.
  • FIG. 1 is a schematic view of an electrode assembly provided with a separator-equipped electrode having a curved portion.
  • FIG. 2 is a schematic view of an electrode assembly provided with a separator-equipped electrode in a serpentine form.
  • FIG. 3 is a schematic view of an electrode assembly provided with a separator-equipped electrode configured to be wound in one direction.
  • FIG. 4 is a schematic view of an electrode assembly provided with a separator-equipped electrode consisting of a combination of a configuration wound in one direction and a serpentine configuration.
  • FIG. 5 is a schematic view of an aspect in which the elongated separator-attached electrode is locally bent.
  • FIG. 6A is a schematic view of an aspect of forming a long separator-attached electrode.
  • FIG. 1 is a schematic view of an electrode assembly provided with a separator-equipped electrode having a curved portion.
  • FIG. 2 is a schematic view of an electrode assembly provided with a separator-equipped electrode in a serpentine form.
  • FIG. 6B is a schematic view of another embodiment for forming a long separator-attached electrode.
  • FIG. 6C is a schematic view of still another embodiment for forming a long separator-attached electrode.
  • FIG. 6D is a schematic view of still another embodiment for forming an elongated separator-equipped electrode.
  • FIG. 7 is a schematic view of an aspect at the start of formation of an electrode assembly provided with a separator-equipped electrode in a serpentine form.
  • FIG. 8 is a schematic view of an aspect during formation of an electrode assembly provided with a separator-equipped electrode in a serpentine form.
  • FIG. 9 is a cross-sectional view schematically showing a basic configuration of the electrode configuration layer.
  • FIG. 10 is a schematic view showing a technical problem found by the inventor of the present invention.
  • a planar view said in this specification is a state when an object is seen from an upper side or lower side along the thickness direction based on the lamination direction of the electrode material which comprises a secondary battery.
  • the “cross-sectional view” as referred to in the present specification is 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 vertical direction and the “horizontal direction” used directly or indirectly in the present specification correspond to the vertical direction and the horizontal direction in the drawings, respectively. Unless otherwise stated, the same reference signs or symbols indicate the same components or parts or the same content.
  • the downward direction in the vertical direction i.e., the direction in which gravity acts
  • the opposite direction corresponds to the "up direction”.
  • the present invention provides a secondary battery.
  • the term "secondary battery” as used herein refers to a battery that can be repeatedly charged and discharged. Therefore, the secondary battery of the present invention is not excessively limited by the name, and for example, "power storage device” and the like may be included in the subject matter of the present invention.
  • the secondary battery has a structure in which an electrode assembly and an electrolyte are housed and sealed inside an outer package.
  • the electrode assembly may have a structure provided with an electrode configuration layer including a positive electrode, a negative electrode and a separator.
  • the outer package may take the form of a conductive hard case or a flexible case (such as a pouch).
  • the positive electrode is connected to the positive electrode external terminal through the positive electrode current collection lead.
  • the positive electrode external terminal is fixed to the exterior body by the seal portion, and the seal portion prevents the electrolyte from leaking.
  • the negative electrode is connected to the negative electrode external terminal through the negative electrode current collection lead.
  • the negative electrode external terminal is fixed to the outer package by the seal portion, and the seal portion prevents the electrolyte from leaking.
  • the present invention is not limited to this, and the positive electrode current collector lead connected to the positive electrode may have the function of the positive electrode external terminal, and the negative electrode current collector lead connected to the negative electrode is the function of the negative electrode external terminal May be provided.
  • the positive electrode is connected to the positive electrode external terminal through the positive electrode current collection lead.
  • the positive electrode external terminal is fixed to the exterior body by the seal portion, and the seal portion prevents the electrolyte from leaking.
  • the positive electrode 10A comprises at least a positive electrode current collector 11A and a positive electrode material layer 12A (see FIG. 9), and the positive electrode material layer 12A is provided on at least one side of the positive electrode current collector 11A.
  • the positive electrode side extraction tab is positioned at a portion where the positive electrode material layer 12A is not provided in the positive electrode current collector 11A, that is, an end portion 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 comprises at least a negative electrode current collector 11B and a negative electrode material layer 12B (see FIG. 9), and the negative electrode material layer 12B is provided on at least one side of the negative electrode current collector 11B.
  • the negative electrode side extraction tab is positioned at a portion where the negative electrode material layer 12B is not provided in the negative electrode current collector 11B, that is, an end portion 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 substances directly involved in the delivery of electrons in the secondary battery, and are mainly responsible for charge and discharge, that is, the battery reaction. It is a substance. More specifically, ions are provided to 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 such ions are the positive electrode 10A and the negative electrode It moves between 10B and transfers electrons to charge and discharge.
  • the positive electrode material layer 12A and the negative electrode material layer 12B are particularly preferably layers capable of inserting and extracting lithium ions.
  • a secondary battery is preferable in which lithium ions move between the positive electrode 10A and the negative electrode 10B through the electrolyte to perform charge and discharge of the battery.
  • 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
  • a binder be contained in the positive electrode material layer 12A for more sufficient contact between particles and shape retention.
  • a conductive support agent may be included in the positive electrode material layer 12A in order to facilitate the transfer of electrons for promoting the cell reaction.
  • the negative electrode active material of the negative electrode material layer 12B is made of, for example, a granular material, it is preferable that a binder be included for more sufficient contact between particles and shape retention, and electron transfer promoting battery reaction is smoothed.
  • a conductive support agent may be contained in the negative electrode material layer 12B to make the As described above, since the plurality of components are contained, the positive electrode material layer 12A and the negative electrode material layer 12B can also be referred to as a "positive electrode mixture layer” and a “negative electrode mixture layer”, respectively.
  • the positive electrode active material is preferably a material that contributes to the storage 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 complex oxide containing lithium and at least one transition metal selected from the group consisting of cobalt, nickel, manganese and iron. That is, in the positive electrode material layer 12A of the secondary battery, such a lithium transition metal composite oxide is preferably contained as a positive electrode active material.
  • the positive electrode active material may be lithium cobaltate, lithium nickelate, lithium manganate, lithium iron phosphate, or some of their transition metals replaced with another metal.
  • Such a positive electrode active material may be contained as a single species but may be contained in combination of two or more.
  • the positive electrode active material contained in the positive electrode material layer 12A is lithium cobaltate.
  • the binder to be included in the positive electrode layer 12A is not particularly limited, but polyvinylidene fluoride, vinylidene fluoride-hexafluoropropylene copolymer, vinylidene fluoride-tetrafluorotyrene copolymer, and polytetrafluoroethylene may be used. At least one member selected from the group consisting of styrene and the like can be mentioned.
  • the conductive aid which may be contained in the positive electrode layer 12A is not particularly limited, but may be thermal black, furnace black, channel black, carbon black such as ketjen black and acetylene black, graphite, carbon nanotubes and gas phase At least one selected from carbon fibers such as grown carbon fibers, metal powders such as copper, nickel, aluminum and silver, and polyphenylene derivatives can be mentioned.
  • the binder of the positive electrode material layer 12A is polyvinylidene fluoride
  • the conductive aid of the positive electrode material layer 12A is carbon black.
  • the binder and the conductive aid of the positive electrode material layer 12A are a combination of polyvinylidene fluoride and carbon black.
  • the negative electrode active material is preferably a material that contributes to the storage and release of lithium ions.
  • the negative electrode active material is preferably, for example, various carbon materials, oxides, lithium alloys, or the like.
  • Examples of various carbon materials of the negative electrode active material include graphite (natural graphite, artificial graphite), soft carbon, hard carbon, diamond-like carbon and the like.
  • graphite is preferable in that 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 as its structural form. This is because deterioration due to nonuniformity such as grain boundaries or defects is less likely to occur.
  • the negative electrode active material of the negative electrode material layer 12B is artificial graphite.
  • the binder which may be contained in the negative electrode material layer 12B is not particularly limited, but at least one selected from the group consisting of styrene butadiene rubber, polyacrylic acid, polyvinylidene fluoride, polyimide resin and polyamideimide resin. I can mention the species.
  • the binder contained in the negative electrode material layer 12B is a styrene butadiene rubber.
  • the conductive aid to be contained in the negative electrode layer 12B is not particularly limited, but may be thermal black, furnace black, channel black, carbon black such as ketjen black and acetylene black, graphite, carbon nanotubes and gas phase At least one selected from carbon fibers such as grown carbon fibers, metal powders such as copper, nickel, aluminum and silver, and polyphenylene derivatives can be mentioned.
  • the component resulting from the thickener component for example, carboxymethylcellulose used at the time of battery manufacture may be contained in the negative electrode material layer 12B.
  • the negative electrode active material and the binder in the negative electrode material layer 12B are 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 or 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 metal foil, punching metal, netting, expanded metal or the like.
  • 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 for 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, copper foil.
  • the separator 50 is a member provided from the viewpoint of short circuit prevention due to contact of positive and negative electrodes and electrolyte retention.
  • the separator 50 is a member that allows ions to pass while preventing the 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 membrane form due to its small thickness.
  • a microporous polyolefin membrane may be used as a 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 may be covered with an inorganic particle coat layer and / or an adhesive layer or the like.
  • the surface of the separator may have adhesiveness.
  • the separator 50 and the electrode (positive electrode 10A / negative electrode 10B) be adhered.
  • the adhesion between the separator 50 and the electrode can be achieved by using an adhesive separator as the separator 50, applying and / or thermocompression bonding an adhesive binder on the electrode material layer (positive electrode material layer 12A / negative electrode material layer 12B), etc. It can be done.
  • the adhesive that provides adhesiveness to the separator 50 or the electrode material layer include polyvinylidene fluoride, an acrylic adhesive, and the like.
  • the electrolyte assists in the movement of metal ions released from the electrodes (positive electrode 10A and negative electrode 10B).
  • the electrolyte may be an electrolyte comprising a "non-aqueous" solvent, such as an organic electrolyte and an organic solvent, and a solute, or an "aqueous" electrolyte comprising water.
  • the secondary battery is preferably a non-aqueous electrolyte secondary battery in which a "non-aqueous" electrolyte is used as the electrolyte.
  • the electrolyte may have a form such as liquid or gel (note that, in the present specification, "liquid” non-aqueous electrolyte is also referred to as "non-aqueous electrolyte").
  • a carbonate As a specific non-aqueous electrolyte solvent, one comprising at least a carbonate is preferable.
  • Such carbonates may be cyclic carbonates and / or linear carbonates.
  • 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.
  • linear carbonates at least one selected from the group consisting of dimethyl carbonate (DMC), diethyl carbonate (DEC), ethyl methyl carbonate (EMC) and dipropyl carbonate (DPC) can be mentioned.
  • DMC dimethyl carbonate
  • DEC diethyl carbonate
  • EMC ethyl methyl carbonate
  • DPC dipropyl carbonate
  • a combination of cyclic carbonates and linear carbonates is used as the non-aqueous electrolyte, for example, a mixture of ethylene carbonate and diethyl carbonate is used.
  • a specific non-aqueous electrolyte solute preferably, for example, a Li salt such as LiPF 6 or LiBF 4 is used.
  • a specific non-aqueous electrolyte solute preferably, for example, a Li salt such as LiPF 6 or LiBF 4 is used.
  • any current collector lead used in the field of secondary batteries can be used.
  • Such current collection lead may be made of a material that can achieve the movement of electrons, for example, a conductive material such as aluminum, nickel, iron, copper, stainless steel and the like.
  • the positive electrode current collector lead is preferably made of aluminum, and the negative electrode current collector lead is preferably made of nickel.
  • the form of the positive electrode current collection lead and the negative electrode current collection 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 that can achieve electron transfer, and is usually made of a conductive material such as aluminum, nickel, iron, copper, stainless steel and the like.
  • the external terminals 5 may be electrically and directly connected to the substrate, or may be electrically and indirectly connected to the substrate through other devices.
  • the current collection lead for positive electrodes connected with each of a plurality of positive electrodes may be provided with the function of the external terminal for positive electrodes, and the current collection for negative electrodes connected with each of a plurality of negative electrodes The lead may have the function of the negative electrode external terminal.
  • the outer package may have the form of a conductive hard case or a flexible case (such as a pouch) as described above.
  • the conductive hard case is composed of a main body and a lid.
  • the main body portion is composed of a bottom portion and a side portion constituting the bottom surface of the outer package.
  • the main body portion and the lid portion are sealed after housing the electrode assembly, the electrolyte, the current collection lead and the external terminal. It does not specifically limit as a sealing method, For example, a laser irradiation method etc. are mentioned.
  • a material which comprises a main-body part and a lid part all materials which can comprise a hard case type
  • Such material may be any material as long as electron transfer can be achieved, and examples thereof include conductive materials such as aluminum, nickel, iron, copper, stainless steel and the like.
  • the dimensions of the main body portion and the lid portion are mainly determined in accordance with the dimensions of the electrode assembly. For example, when the electrode assembly is accommodated, the dimension to such an extent that movement (displacement) of the electrode assembly in the exterior body is prevented It is preferable to have. Preventing the movement of the electrode assembly prevents the breakage of the electrode assembly and improves the safety of the secondary battery.
  • the flexible case is composed of a soft sheet.
  • the soft sheet has only to be soft enough to achieve bending of the seal portion, and is preferably a plastic sheet.
  • the plastic sheet is a sheet having a characteristic that deformation by external force is maintained when it is removed after applying external force, and a so-called laminate film can be used, for example.
  • the flexible pouch made of a laminate film can be produced, for example, by laminating two sheets of laminate film and heat-sealing the peripheral portion.
  • the laminate film a film obtained by laminating a metal foil and a polymer film is generally used, and specifically, one having a three-layer structure consisting of an outer layer polymer film / metal foil / inner layer polymer film is exemplified.
  • the outer layer polymer film is for preventing permeation of moisture and the like and damage to the metal foil due to contact and the like, and polymers such as polyamide and polyester can be suitably used.
  • the metal foil is for preventing permeation of moisture and gas, and foils of copper, aluminum, stainless steel, etc. can be suitably used.
  • the inner layer polymer film is intended to protect the metal foil from the electrolyte contained inside and to melt and seal it at the time of heat sealing, and polyolefin or acid-modified polyolefin can be suitably used.
  • the inventors of the present application have keenly studied measures to preferably suppress local cracking and / or peeling of the electrode material layer in a separator-attached electrode having a curved portion. As a result, it came to devise the secondary battery of the present invention.
  • the “separator-attached electrode” in the present specification refers to one in which the separator is adhered to the main surface of the electrode and the electrode and the separator are integrated.
  • the “separator-equipped electrode having alternating non-curved portions and curved portions” as used herein refers to a separator-equipped electrode having curved portions formed at predetermined intervals, which is a complete product of the electrode assembly. It refers to something that becomes an element.
  • the term "long separator-attached electrode extending in one direction” refers to a separator-attached electrode used in the process of manufacturing the electrode assembly, and extends in one direction along the longitudinal axis. It refers to one with a relatively large linear dimension.
  • non-curved portion of the electrode with separator refers to a component of the electrode with separator and is not curved, and for example, a portion linearly extending in one direction.
  • non-curved portion of the separator-attached electrode referred to in the present specification is configured to be located between one curved portion and the other curved portion of the separator-attached electrode and to be continuous with the end of each curved portion. It refers to what is being done.
  • the "curved portion of the separator-attached electrode” as used herein refers to a component of the separator-attached electrode and forms a curved form, for example, a portion forming a semicircular or semi-elliptical form in a sectional view Point to.
  • the term "one electrode” as used herein refers to an electrode that is a component of a separator-equipped electrode.
  • the “other electrode” as used herein refers to an electrode which is different in polarity from the electrode included in the electrode with a separator, and which is relatively short and extends in only one direction as compared to the electrode with a separator.
  • the “side portion of the other electrode” referred to in the present specification means the exposure of the electrode in the case where the main surface of the positive electrode and the main surface of the negative electrode face each other across the separator along the stacking direction. Point to the end face.
  • non-forming portion of the electrode material layer refers to a portion where the electrode material layer is not formed.
  • the current collector and the separator of only one electrode are entirely wound in one direction as a whole” means, in a broad sense, a component of the electrode with a separator so as to be wound around the other electrode. In this case, only the current collector and the separator of one of the electrodes are wound in the same direction.
  • the current collector and the separator of only one electrode are generally wound in one direction as a whole” means that one electrode has a curved portion and a non-curved portion in a narrow sense.
  • the current collectors and the separators of the present invention are in the form of being wound in one direction as a whole.
  • "bending locally an elongated separator-equipped electrode extending in one direction” means adding a elongated separator extending in one direction during the production of the electrode assembly. It refers to selectively or partially curving a limited portion of the entire electrode.
  • non-coated portion of the electrode material layer refers to a portion where the electrode material layer is not coated on the main surface of a plate-like metal foil serving as a current collector.
  • “only the current collector and the separator of one electrode are continuous as a whole” means that each of the current collector and the separator of the one electrode has the entire portion with the separator including the curved portion. Point from one end to the other end is connected without interruption.
  • the inventor of the present application has proposed that the electrode material layer in which local cracking and / or peeling can occur is removed from the curved portion of the separator-attached electrode as the countermeasure described above. That is, the present invention has a technical idea that the electrode material layer is not present in the curved portion of the separator-attached electrode. According to this technical idea, since the electrode material layer is not present in the curved portion of the separator-attached electrode, it is preferable to cause local cracking and / or peeling of the electrode material layer in the curved portion. It becomes possible to suppress. This can solve the original technical problems found by the inventor. The details including the other technical effects are described below.
  • FIG. 1 is a schematic view of an electrode assembly 200 provided with a separator-equipped electrode 100 having a curved portion 101.
  • a secondary battery according to an embodiment of the present invention comprises an electrode assembly 200 in an outer package.
  • the electrode assembly 200 includes a single separator-equipped electrode 100 in which a plurality of one electrodes (for example, the negative electrode 10B) and the separator 50 form an integral structure, and at least two other electrodes (for example, one) having different polarities (for example, And a positive electrode 10A).
  • the separator-equipped electrode 100 includes one of the electrodes (for example, the negative electrode 10B) and two opposing separators 50 disposed so as to sandwich the electrode.
  • the other electrode includes the current collector (for example, positive electrode current collector 11A) and the electrode material layer (for example, positive electrode material layer 12A) formed on both sides of the current collector except the outermost layer region of the electrode assembly 200. .
  • the other electrode has a current collector (for example, the positive electrode current collector 11A) and an electrode material layer (for example, the positive electrode material layer 12A) formed on one side of the current collector in the outermost layer region of the electrode assembly 200. Have.
  • the electrode with separator 100 is configured to have a non-curved portion 102 and a curved portion 101 continuous to the non-curved portion 102 alternately.
  • the said non-curved part 102 becomes an electrode material layer formation part of one electrode (for example, negative electrode 10B).
  • the non-curved portion 102 includes a current collector of one electrode (for example, the negative electrode current collector 11B) and an electrode material layer (for example, the negative electrode material layer 12B) formed on both sides of the current collector.
  • the curved portion 101 of the separator-equipped electrode 100 may be in a curved form but may not be in direct contact with the other opposing electrode (e.g., the positive electrode 10A).
  • the non-curved portions 102 of the separator-equipped electrode 100 and the other electrode are alternately disposed along the stacking direction. Specifically, the non-curved portions 102 and the other electrode are alternately arranged along the stacking direction so that the main surface region of the non-curved portion 102 and the main surface region of the other electrode are in contact with each other. It is done.
  • the curved portion 101 of the separator-equipped electrode 100 has a structure having only the current collector of one curved electrode and the curved separator. .
  • the structure is a feature of the present invention.
  • the curved portion 101 has a structure in which the electrode material layer (for example, the negative electrode material layer 12B) of one of the electrodes is not formed "an electrode material layer non-formed portion". From another viewpoint, this means that in the curved portion 101, only the negative electrode current collector 11B is positioned between the two separators 50 which are components of the separator-equipped electrode.
  • the curved portion 101, and the side portion 10A 1 and the curved portion 101 of the other electrode positioned in a portion opposed to each other.
  • the separator-equipped electrode 100 when the separator-equipped electrode 100 is viewed as a whole, only the current collector of the one electrode (eg, the negative electrode 10B) included in the separator-equipped electrode 100 and the separator 50 have a continuous form as a whole. Become.
  • the electrode material layer for example, the negative electrode material layer 12B
  • the separator-equipped electrode 100 is viewed as a whole, the electrode material layer (for example, the negative electrode material layer 12B) is positioned at the non-curved portions 102 alternately formed in the separator-equipped electrode 100. It will be in an intermittent form.
  • the curved portion 101 is a portion where tensile stress may occur due to its form
  • the electrode material layer is not formed on the curved portion 101, tensile stress occurs in the electrode material layer. It is possible to suppress that. Therefore, by suppressing the generation of tensile stress on the electrode material layer, it is possible to preferably suppress the generation of local cracking and / or peeling of the electrode material layer in the curved portion 101. Therefore, it becomes possible to preferably suppress the occurrence of a short circuit when a voltage is applied starting from the cracked portion of the electrode material layer and / or the peeled portion of the electrode material layer.
  • the electrode (for example, the negative electrode 10B) included in the separator-equipped electrode 100 can preferably function as a component of the secondary battery as a whole due to the suppression of the occurrence of the short circuit.
  • the secondary battery of the present invention can preferably exhibit desired battery characteristics.
  • the non-curved portions 102 of the separator-equipped electrode 100 and the other electrode are alternately arranged along the stacking direction.
  • the non-curved portion 102 has a structure including one electrode (for example, the negative electrode 10B) and the separators 50 positioned on both main surfaces of the electrode.
  • one electrode for example, the negative electrode 10B
  • one electrode includes a current collector (for example, the negative electrode current collector 11B) and an electrode material layer (for example, a negative electrode) formed on both sides of the current collector.
  • the structure has a material layer 12B).
  • the positive electrode 10A and the negative electrode 10B are configured to face each other via the separator 50. Therefore, it is possible for lithium ions to move between the positive electrode 10A and the negative electrode 10B through the electrolytic solution to preferably carry out the delivery of electrons. That is, in order to transfer electrons preferably, it is sufficient that the positive electrode 10A and the negative electrode 10B face each other through the separator 50.
  • electrons can be suitably delivered even without the electrode material layer (for example, the negative electrode material layer) in the curved portion 101 of the separator-attached electrode 100. That is, even if the curved portion 101 of the separator-attached electrode 100 does not have an electrode material layer (for example, a negative electrode material layer), it is possible to provide a predetermined battery capacity.
  • the volume of the electrode, specifically the electrode material layer is also provided to the curved portion 101 as a whole. It is reduced compared to the case. From another point of view, although not shown in detail in the drawing, since the separator 50 can be said to be a non-rigid material due to its material characteristics, the thickness of the curved portion 101 is not sufficient because the electrode material layer does not exist. Can be relatively reduced.
  • the electrode material layer for example, the negative electrode material layer
  • the curved portion 101 does not have an electrode material layer (for example, a negative electrode material layer), it is possible to provide a predetermined battery capacity, while the volume or thickness of the separator-equipped electrode 100 as a whole is obtained. It is possible to reduce. This means that the battery capacity per unit volume is increased. Thereby, it is possible to further improve the energy density of the battery due to the increase of the battery capacity per unit volume. Further, since it is possible to reduce the thickness of the curved portion 101, it is also possible to reduce the size of the electrode assembly 200 and hence the size of the outer package, ie, the secondary battery.
  • an electrode material layer for example, a negative electrode material layer
  • the current collector for example, the negative electrode current collector 11B of one continuous electrode (for example, the negative electrode 10B) and the separator 50 may have the following forms.
  • the curved portion 101 of the separator-equipped electrode 100 has a structure having only the current collector of one curved electrode and the curved separator.
  • the configuration of the current collector (for example, the negative electrode current collector 11B) of the one continuous electrode (for example, the negative electrode 10B) and the separator 50 is not particularly limited as long as such a structure is obtained.
  • only the negative electrode current collector 11B of the negative electrode 10B and the separator 50 may form a serpentine form as a whole (see FIG. 2). That is, only the negative electrode current collector 11B and the separator 50 can adopt a zigzag structure as a whole.
  • the above-mentioned separator-equipped electrode 100 has a structure in which curved portions 101 and non-curved portions 102 are continuously and alternately formed” and “components of the separator-equipped electrode 100”.
  • the negative electrode current collector 11B and the separator 50 form a meandering form as a whole while alternately forming a curved portion and a non-curved portion. This means that the negative electrode current collector 11B and the separator 50 do not meander as a whole while forming only curved portions alternately and continuously.
  • the negative electrode current collector 11B of the negative electrode 10B and the separator 50 may be in the form of being wound in one direction as a whole (see FIG. 3). More specifically, “the above-mentioned separator-equipped electrode 100 has a structure in which curved portions 101 and non-curved portions 102 are continuously and alternately formed” and “components of the separator-equipped electrode 100”. Taking the form that “only the negative electrode current collector 11B and the separator 50 are wound in one direction as a whole” is taken into consideration, the following form is taken. That is, the negative electrode current collector 11B and the separator 50 are wound in one direction as a whole while alternately forming curved portions and non-curved portions alternately. This means that the negative electrode current collector 11B and the separator 50 do not have a form wound in one direction as a whole while alternately forming only curved portions alternately.
  • the current collector for example, the negative electrode current collector 11B
  • the separator 50 of one continuous electrode for example, the negative electrode 10B
  • the current collector and the separator 50 of one continuous electrode preferably take the following form (see FIG. 4).
  • the other electrode e.g., the positive electrode 10A
  • the non-curved portion 102 ⁇ located on the most terminal side of the separator-equipped electrode 100 is positioned so as to be sandwiched between the other electrodes (for example, the positive electrode 10A).
  • the non-curved portion 102 ⁇ includes the current collector 11B and the electrode material layer 12B formed on both main surfaces of the current collector 11B. That is, a double-sided electrode structure is adopted in the non-curved portion 102 ⁇ located on the most end side of the separator-equipped electrode 100.
  • the non-curved portion 102 ⁇ at least one before the non-curved portion 102 ⁇ located on the most end side of the separator-equipped electrode 100 is positioned in the outermost region of the electrode assembly 200.
  • the non-curved portion 102 ⁇ includes the current collector 11B and the electrode material layer 12B formed only on one main surface of the current collector 11B. That is, in the non-curved portion 102 ⁇ of the separator-equipped electrode 100, the “single-sided electrode structure” is adopted.
  • the electrode in the outermost layer region of the electrode assembly 200 has a single-sided electrode structure extending in one direction (a current collector and a structure including an electrode material layer formed only on one main surface of the current collector) It is generally common to take However, such a structure may cause the following problems.
  • the electrode located in the outermost layer region of the electrode assembly has a desired density after applying and drying the electrode material layer only on one main surface of the current collector extending in one direction.
  • the current collector is mainly composed of a metal foil, ie, a metal member, while the electrode material layer mainly contains an active material and a binder (for example, a polymer compound). That is, the types of constituent materials of the current collector and the electrode material layer are different from each other.
  • the difference in the type of material between the current collector and the electrode material layer is the difference in the degree of elongation between the current collector and the electrode material layer when subjected to pressure treatment for obtaining the outermost layer electrode having a desired density. It can be connected.
  • the electrode material expands relatively larger than the current collector at the time of pressure treatment for obtaining the electrode positioned on the outermost layer (corresponding to the single-sided electrode), and as a result Warpage stress is likely to occur in the electrode positioned in the outer layer.
  • the occurrence of such warpage stress can lead to the warpage of the electrode positioned in the outermost layer.
  • the warping of the electrode positioned in the outermost layer may result in that the electrode positioned in the outermost layer can not be suitably bonded as a whole to the separator positioned between the electrodes in the inner region (corresponding to double-sided electrodes) when configuring the electrode assembly 200 . Therefore, the electrode of the outermost layer may not function properly as a component of the electrode assembly 200. As a result, there is a possibility that the secondary battery including the electrode assembly 200 as a whole can not preferably exhibit desired battery characteristics.
  • the other electrode (for example, the positive electrode 10A) of the single-sided electrode structure extending only in one direction is not positioned as (1) the outermost layer electrode. This means that the above-mentioned warped electrode is not present in the outermost layer area of the electrode assembly 200.
  • the double-sided electrode structure is adopted in the portion to be the non-curved portion 102 ⁇ (the portion located on the most end side of the electrode with separator 100).
  • the “one-sided electrode structure” is adopted in the non-curved portion 102 ⁇ positioned in the region (the portion at least one before the non-curved portion 102 ⁇ located on the most end side of the separator-equipped electrode 100). That is, a single separator-equipped electrode 100 has a plurality of electrodes disposed apart from each other as its constituent elements, and of the plurality of electrodes, a double-sided electrode is disposed at the most terminal part of the separator-equipped electrode 100 On the other hand, the single-sided electrode is disposed in the portion closest to the most end of the separator-equipped electrode 100.
  • the single-sided electrode which is a component of the single separator-equipped electrode 100 is positioned between the double-sided electrode and the other double-sided electrode. Therefore, at the time of the heat treatment at the time of manufacturing of the single electrode with separator 100, the double-sided electrode which is less likely to generate a warpage stress is positioned at least on both sides of the portion to be the single-sided electrode. It is possible to suppress warpage stress that may occur in the electrode. Therefore, even when the portion to be the single-sided electrode of the elongated separator-equipped electrode 100 is positioned in the outermost region of the electrode assembly 200, the portion between the double-sided electrode in the inner region of the electrode assembly 200 is not
  • the single-sided electrode can be suitably bonded as a whole. Therefore, the single-sided electrode as the outermost layer electrode can suitably function as a component of the electrode assembly 200. As a result, the secondary battery including the electrode assembly 200 as a whole can preferably exhibit desired battery characteristics.
  • this aspect is more preferable in the following points. Specifically, even in the case where the separator-equipped electrode 100 as a whole has a meandering shape, or in the case where it is wound in one direction, the non-curved portion of the outermost region of the separator-equipped electrode 100 is a single-sided electrode It is possible to form In this case, it is effective in that the other short electrode extending in one direction, which causes the warpage stress to occur directly, can not be positioned.
  • the single-sided electrode is positioned at the non-curved portion on the most terminal side of the separator-equipped electrode 100, the portion to be the single-sided electrode in the heat treatment at the time of manufacturing the single separator-equipped electrode 100 In both sides of this, the double-sided electrode which is hard to produce a warp stress is not necessarily located.
  • the single-sided electrode is positioned between the one and the other double-sided electrodes of the end of the elongated separator-equipped electrode 100, the single-sided electrode is It is possible to effectively suppress the warpage stress which is likely to occur at the both sides of the single-sided electrode which is difficult to cause the warpage stress.
  • this aspect is advantageous in that the warpage stress which may occur in the single-sided electrode can be more suitably suppressed.
  • the electrode with separator 100 when the single-sided electrode is positioned between the double-sided electrode at one end of the long end of the electrode with separator 100 and the other double-sided electrode of “plural”, warpage stress hardly occurs
  • the warpage stress that may occur in the single-sided electrode can be further preferably suppressed due to the presence of the other double-sided electrode.
  • the “plurality” of the other double-sided electrode is particularly advantageous because the warpage stress that may occur in the single-sided electrode can be further suppressed.
  • the manufacturing method of the present invention includes locally curving the elongated separator-equipped electrode 100 extending in one direction.
  • the current collector for example, the negative electrode current collector 11B
  • the separator 50 are It is characterized by positioning only (see FIG. 5).
  • the electrode material layer for example, the negative electrode material layer 12B
  • the separator-equipped electrode 100 is viewed as a whole, only the negative electrode current collector 11B and the separator 50 contained in the separator-equipped electrode 100 form a continuous form as a whole.
  • the electrode material layer for example, the negative electrode material layer 12B
  • the electrode material layer is not present in the curved portion 101 of the separator-attached electrode 100
  • local cracking of the electrode material layer in the curved portion 101 is caused due to this. It is possible to preferably suppress the occurrence of peeling and / or peeling. This can solve the original technical problems found by the inventor. The details including the other technical effects are described below.
  • the electrode with separator 100 alternately has the non-curved portion 102 and the curved portion 101 continuous to the non-curved portion 102, and (ii) the non-curved portion
  • the elongated separator-equipped electrode 100 is locally curved (see FIG. 5) so that the electrode 102 and the other electrode (for example, the positive electrode 10A) are alternately disposed along the stacking direction. Also, and a portion 101 to the side 10A 1 and the curvature of the other electrode (e.g., cathode 10A) so as to face each other, to locally curved elongated separator with the electrode 100 (see FIG. 5).
  • the non-curved portion 102 of the separator-attached electrode 100 which is formed by such local bending, becomes the electrode material layer forming portion of one electrode (for example, the negative electrode 10B), and the current collector and current collector of one electrode. It will contain the electrode material layer formed on both sides.
  • the electrode material layer (for example, the negative electrode material layer 12B) does not exist in a portion 101 (corresponding to a curved portion) where the elongated separator-equipped electrode 100 is locally curved.
  • the elongated separator-attached electrode 100 can be formed through the following basic steps (FIGS. 6A (a) to 6C (a) and 6A (b) to 6C (b)). reference).
  • the raw material of the electrode material layer 12B is intermittently applied to at least one main surface of the metal foil to be the current collector 11B.
  • one long electrode for example, the negative electrode 10B
  • thermocompression-bonding the separator 50 so as to sandwich the electrode material layer 12B.
  • the elongated separator-equipped electrode 100 can be formed.
  • a portion for example, an electrode tab
  • the metal foil may be cut to form one elongated electrode (without separator) (see FIGS. 6A and 6C).
  • the electrode tab 20B 1 is a moiety capable of connecting the leads are placed in the following locations.
  • the serpentine-shaped separator-attached electrode 100 is formed by locally bending it is taken as an example.
  • each electrode tab 20B 1 is and each electrode tab 20B 1 positioned in non-curved portions of the zigzag separator with the electrode 100 overlap with each other, and one electrode of the curved front of the elongated the electrode tabs 20B 1 is positioned becomes part.
  • the places where the electrode tabs are provided are not limited to the embodiment shown in FIG. 6A.
  • the aspect shown in FIG. 6B and FIG. 6C can be taken.
  • the tab 20B 2 is substantially continuous to all of the longitudinal side of the current collector 11B and located outside the longitudinal side of the separator 50 in plan view. May be provided.
  • the serpentine shaped electrode with separator 100 is an electrode.
  • the electrode tabs 20B 1 is positioned in a portion comprising a curved front of the elongated one electrode.
  • the tab of the electrode with separator for example, in a serpentine shape after bending and the tab of the other short electrode extending only in one direction are from the viewpoint of short circuit prevention. Preferably, they are positioned so as not to overlap each other.
  • the curved portion 101 is a portion where tensile stress may occur due to the curved form
  • the electrode material layer is not formed on the curved portion 101 in the manufacturing method of the present invention. Therefore, it is possible to suppress that a tensile stress is generated in the electrode material layer at the curved portion 101.
  • By suppressing the generation of the tensile stress to the electrode material layer it is possible to preferably suppress the generation of local cracking and / or peeling of the electrode material layer at the curved portion 101. Thereby, it becomes possible to suppress generation
  • the electrode material layer for example, the negative electrode material layer
  • the volume of the electrode is reduced as compared with the case where the electrode material layer is also provided to the curved portion 101 as a whole.
  • the separator 50 is a non-rigid material due to its material properties, so the thickness of the curved portion 101 can be relatively reduced by the absence of the electrode material layer. .
  • the production method of the present invention may adopt the following embodiments.
  • the current collector for example, the negative electrode current collector 11B
  • one electrode for example, the negative electrode 10B
  • the separator 50 are provided in the portion 101 where the elongated separator-attached electrode 100 is locally bent. It is characterized by positioning (see FIG. 5). Based on this feature, for example, the embodiments shown in FIGS. 7 and 8 may be adopted.
  • the non-curved portion 102 is a separator positioned on one of the electrodes (eg, the negative electrode 10B) and both major surfaces of the electrode It has a structure of 50.
  • the one electrode for example, the negative electrode 10B
  • includes a current collector for example, a negative electrode current collector
  • an electrode material layer for example, a negative electrode material layer
  • the long separator-attached electrode 100 substantially directly on the negative electrode layer which is a component of the non-curved portion 102 of the electrode which may be formed by meandering. Place the other electrode in the area.
  • the non-curved portions 102 of the separator-equipped electrode 100 and the other electrode (for example, the positive electrode 10A) can be alternately arranged along the stacking direction.
  • the electrode assembly in which a plurality of electrode configuration layers including the positive electrode 10A, the negative electrode 10B, and the separator 50 between the positive electrode 10A and the negative electrode 10B are stacked.
  • the separator 50 is a porous member. Therefore, the position of the negative electrode material layer located below the separator 50 can be determined through the hole of the separator 50 which is a component of the non-curved portion 102 of the electrode that can be formed after meandering the elongated separator-equipped electrode 100. It is possible to confirm suitably. From the above, also, when the other electrode (for example, the positive electrode 10A) is disposed in the non-curved portion 102, the other electrode can be suitably positioned in a region approximately immediately above the negative electrode layer of the non-curved portion 102. It is. That is, it is possible to preferably suppress the positional deviation of the other electrode.
  • the other electrode for example, the positive electrode 10A
  • the production method of the present invention preferably adopts the following aspect.
  • an electrode assembly 200 having the following features (see FIG. 4). -As the outermost layer electrode which is a component of the obtained electrode assembly 200, the other electrode 10A of the single-sided electrode structure extending only in one direction is not positioned. -On the other hand, as the outermost layer electrode which is a component of the obtained electrode assembly 200, the electrode 10B of the single-sided electrode structure which is a component of the separator-equipped electrode 100 is positioned. Specifically, a portion to be the non-curved portion 102 ⁇ of the separator-equipped electrode 100 (a portion located on the most terminal side of the separator-equipped electrode 100) obtained through the following steps (1) and (2) Do.
  • the raw material of the electrode material layer is intermittently coated on both main surfaces of a sheet-like metal foil to be a current collector to form one electrode of a double-sided electrode structure, and also to be a current collector
  • the raw material of the electrode material layer is locally applied only to one main surface of the sheet-like metal foil to form one electrode of a single-sided electrode structure (see FIG. 6D).
  • the raw material of the electrode material layer is coated on both main surfaces of at least one end region of the sheet-like metal foil to form one electrode of the double-sided electrode structure, One of the electrodes of the electrode structure is formed.
  • a long (or sheet) separator-attached electrode 100 is obtained.
  • “to form one electrode of the single-sided electrode structure adjacent to the portion where one electrode of the double-sided electrode structure is formed” is a component of the obtained elongated separator-equipped electrode 100.
  • it means forming an electrode 10B of a single-sided electrode structure that is disposed in the closest proximity to the electrode 10B of the double-sided electrode structure located on the most end side of the elongated separator-equipped electrode 100.
  • a plurality of non-curved portions of the electrode with separator 100 after bending obtained through the following step (2) as in the embodiment shown in FIG. as the electrode tabs 20B 1 only one is positioned out of the electrode tabs 20B 1 may be positioned in a portion comprising a curved front of the elongated one electrode.
  • the long separator-attached electrode 100 is wound in one direction, and then the separator-attached electrode 100 wound in one direction is meandered (see FIG. 4).
  • one elongated separator-equipped electrode 100 is arranged such that one electrode of the single-sided electrode structure is positioned in the outermost region of the electrode assembly 200 configured of the separator-equipped electrode 100 and the other electrode. Wind in the direction. Subsequently, the winding / meandering of the elongated separator-equipped electrode 100 and the placement of the other electrode on the non-curved portion 102 of the separator-equipped electrode 100 formed at the time of winding / meandering are alternately repeated. Thereby, the non-curved portion 102 of the separator-equipped electrode 100 and the other electrode can form an electrode assembly 200 alternately arranged along the stacking direction.
  • a single separator-equipped electrode 100 has a plurality of electrodes disposed apart from each other as its component, and of the plurality of electrodes, a double-sided electrode is provided at the most terminal part of the separator-equipped electrode 100. Are disposed, while the single-sided electrode is spaced apart at a portion closest to the most end portion of the separator-equipped electrode 100. More specifically, the single-sided electrode which is a component of the single separator-equipped electrode 100 is positioned between at least one double-sided electrode and the other double-sided electrode. Therefore, at the time of the heat treatment at the time of manufacture of the single electrode with separator 100, at least the double-sided electrode which is hard to generate the warp stress is located on both sides of the part to be the single-sided electrode.
  • the portion to be the single-sided electrode of the elongated separator-equipped electrode 100 is positioned in the outermost region of the electrode assembly 200, the portion between the double-sided electrode in the inner region of the electrode assembly 200 is not
  • the single-sided electrode can be suitably bonded as a whole. Therefore, the single-sided electrode as the outermost layer electrode can suitably function as a component of the electrode assembly 200.
  • step (1) “both” of the sheet-like metal foil is used. It is preferable to form one electrode of a single-sided electrode structure adjacent to the place which forms one electrode of a double-sided electrode structure by applying the raw material of an electrode material layer on both main surfaces of an edge part area
  • 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 one embodiment of the present invention, in particular, the non-aqueous electrolyte secondary battery is, by way of example only, in the field of electricity, information and communication in which mobile devices and the like are used (for example, mobile phones, smartphones, notebooks) Mobile devices such as personal computers, digital cameras, activity meters, arm computers, and electronic papers), home and small industrial applications (for example, electric tools, golf carts, fields of home / care and industrial robots), large Industrial applications (eg, fork lifts, elevators, harbor cranes), transportation systems (eg, hybrid vehicles, electric cars, buses, trains, electrically assisted bicycles, electric motorcycles, etc.) Fields such as power generation, road conditioners, smart grids, and general household installed storage systems , Medical applications (medical devices such as earphone hearing aids), medical applications (fields such as dose management systems), IoT fields, and space / deep sea applications (for example, fields such as space
  • Electrode assembly 100 100 'electrode with separator 101, 101' curved portion 102, 102 ⁇ , 102 ⁇ of electrode with separator non-curved portion 50 of electrode with separator 50, 50 'separator 10A, 10A' positive electrode (other electrode) 10A 1 side of positive electrode (side of other electrode) 10B, 10B 'negative electrode (one electrode) 11A, 11A 'Positive electrode current collector 11B, 11B' Negative electrode current collector 12A, 12A 'Positive electrode material layer 12B, 12B' Negative electrode material layer 20B 1 Electrode tab 20B 2 Partially equivalent to electrode tab 20B Curved portion of electrode with separator Crack area X winding area Y meandering area of electrode material layer

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Abstract

L'invention concerne une batterie secondaire qui permet de supprimer de manière appropriée le craquage et/ou le pelage local d'une couche de matériau d'électrode dans une électrode équipée d'un séparateur ayant une partie courbée. Une batterie selon la présente invention est une batterie secondaire comprenant une seule électrode équipée d'un séparateur dans laquelle une électrode et un séparateur forment une structure intégrée, et au moins deux autres électrodes ayant chacune une polarité différente de celle de ladite électrode, l'électrode équipée d'un séparateur ayant une partie non courbée et une partie courbée contiguë à la partie non courbée d'une manière alternée, la partie non courbée et les autres électrodes sont disposées le long de la direction d'empilement d'une manière alternée, et la partie courbée n'a qu'un séparateur et un collecteur de l'électrode qui sont chacune courbées.
PCT/JP2018/037312 2017-10-11 2018-10-05 Batterie secondaire et procédé de fabrication de batterie secondaire Ceased WO2019073914A1 (fr)

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CN113644321A (zh) * 2021-08-30 2021-11-12 蜂巢能源科技有限公司 叠片电池的叠片方法及设备
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WO2023242982A1 (fr) * 2022-06-15 2023-12-21 ＴｅｒａＷａｔｔ Ｔｅｃｈｎｏｌｏｇｙ株式会社 Batterie secondaire et procédé de fabrication de batterie secondaire

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