WO2018163775A1 - Procédé de production de batterie secondaire - Google Patents

Procédé de production de batterie secondaire Download PDF

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Publication number
WO2018163775A1
WO2018163775A1 PCT/JP2018/005751 JP2018005751W WO2018163775A1 WO 2018163775 A1 WO2018163775 A1 WO 2018163775A1 JP 2018005751 W JP2018005751 W JP 2018005751W WO 2018163775 A1 WO2018163775 A1 WO 2018163775A1
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Prior art keywords
electrode
negative electrode
separator
positive electrode
layer precursor
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PCT/JP2018/005751
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English (en)
Japanese (ja)
Inventor
泰拓 松▲崎▼
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株式会社村田製作所
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Publication of WO2018163775A1 publication Critical patent/WO2018163775A1/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
    • H01M10/04—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
    • 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
    • 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
    • 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 method for manufacturing a secondary battery.
  • Patent Document 1 discloses a planar laminated structure in which an electrode assembly, which is a component of a secondary battery, has a plurality of electrode constituent layers including a positive electrode, a negative electrode, and a separator in a planar view. It is disclosed.
  • a planar laminated structure type electrode assembly is obtained by alternately bonding and laminating positive electrodes 10A ′ and negative electrodes 10B ′ via separators 50 ′ along the laminating direction (see FIG. 5). .
  • the positive electrode 10A ′, the negative electrode 10B ′, and the separator 50 ′ are individually cut due to different sizes and materials. ing. However, the individual cutting of the positive electrode 10A ', the negative electrode 10B', and the separator 50 'is not desirable from the viewpoint of production efficiency.
  • FIG. 1A is a plan view schematically showing an electrode constituent layer precursor before cutting.
  • FIG. 1B is a cross-sectional view schematically showing the electrode constituent layer precursor before cutting.
  • FIG. 1C is a cross-sectional view schematically showing the electrode constituent layer precursor after cutting.
  • FIG. 2 is a schematic diagram of a manufacturing flow of the electrode assembly.
  • FIG. 3A is a plan view schematically showing a form of forming a rectangular electrode constituent layer precursor.
  • FIG. 3B is a plan view schematically showing a formation mode of a non-rectangular electrode constituent layer precursor.
  • FIG. 4 is a cross-sectional view schematically showing the basic configuration of the electrode constituent layer.
  • FIG. 5 is a schematic diagram showing a technical problem found by the inventors.
  • vertical direction and horizontal direction used directly or indirectly in the present specification correspond to the vertical direction and horizontal direction in the drawing, respectively. Unless otherwise specified, the same symbols or symbols indicate the same members / parts or the same meaning. In a preferable aspect, it can be understood that the downward direction in the vertical direction (that is, the direction in which gravity works) corresponds to the “down direction” and the reverse direction corresponds to the “up direction”.
  • a secondary battery In the present invention, a secondary battery is provided.
  • the “secondary battery” in the present specification refers to a battery that can be repeatedly charged and discharged. Therefore, the secondary battery of the present invention is not excessively bound by its name, and for example, “electric storage device” can also be included in the subject of the present invention.
  • 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 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).
  • 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 includes at least a positive electrode current collector 11A and a positive electrode material layer 12A (see FIG. 4), and a positive electrode material layer 12A is provided on at least one surface of the positive electrode current collector 11A.
  • a positive electrode side extraction tab is positioned at a position where the positive electrode material layer 12A is not provided, 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 is composed of at least a negative electrode current collector 11B and a negative electrode material layer 12B (see FIG. 4), and the negative electrode material layer 12B is provided on at least one surface of the negative electrode current collector 11B.
  • 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
  • a binder is contained in the positive electrode material layer 12A in order to more sufficiently contact the particles and maintain the shape.
  • 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 more sufficient contact between the particles and shape retention, facilitating the transfer of electrons that promote the battery reaction.
  • the conductive support agent may be contained 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 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), soft carbon, hard 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.
  • 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 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 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 binder material that provides adhesiveness to the separator 50 or the electrode material layer include polyvinylidene fluoride, a vinylidene fluoride-hexafluoropropylene polymer, and an acrylic resin.
  • the thickness of the adhesive layer by applying an adhesive binder or the like may be 0.5 ⁇ m or more and 5 ⁇ m or less.
  • 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.
  • 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.
  • the “electrode constituent layer precursor” in the present specification refers to a product in the process of manufacturing an electrode constituent layer (including a positive electrode, a negative electrode, and a separator) that is a constituent element of the electrode assembly.
  • the “electrode constituent layer precursor” is, in a narrow sense, provided with one electrode (corresponding to a negative electrode) and a separator, which are constituent elements of an electrode assembly, and the other electrode (positive electrode). Equivalent) is not included.
  • adhereing the separator to the main surface (one main surface or both main surfaces) of the negative electrode specifically refers to adhering the separator to the main surface of the negative electrode material layer that is a component of the negative electrode.
  • adheredhering a positive electrode to a separator of a cut electrode constituent layer precursor specifically refers to the separator of the cut electrode constituent layer precursor, the main surface of the separator and the positive electrode material layer of the positive electrode Indicates that the positive electrodes are bonded so that they face each other.
  • the inventors of the present invention perform positive electrode 10A ′, negative electrode, which are performed prior to alternately bonding and laminating positive electrode 10A ′ and negative electrode 10B ′ via separator 50 ′ along the stacking direction.
  • positive electrode 10A ′ negative electrode
  • separator 50 ′ separator 50 ′ along the stacking direction.
  • intensive studies were made and the present invention was devised.
  • the inventors cut the positive electrode 10A ′, the negative electrode 10B ′, and the separator 50 ′ individually before alternately laminating the positive electrode 10A ′ and the negative electrode 10B ′ through the separator 50 ′ along the stacking direction.
  • the present invention was devised contrary to the technical common sense of those skilled in the art. That is, the present invention is characterized in that it is devised contrary to the technical common sense of those skilled in the art.
  • an electrode assembly 500 having a planar stacked structure in which a plurality of electrode constituent layers including the positive electrode 10A, the negative electrode 10B, and the separator 50 are stacked in a planar view is manufactured.
  • the separator 50 when manufacturing the electrode assembly 500, (i) the separator 50 is bonded to at least one main surface of the negative electrode 10B along the stacking direction, and the negative electrode 10B and the separator 50 are provided. It includes at least a step of forming the electrode constituent layer precursor 100 ⁇ (see FIGS. 1A and 1B) and (ii) a step of cutting the electrode constituent layer precursor 100 ⁇ along the stacking direction (see FIG. 1C).
  • At least one principal surface of the anode current collector 11B in the stacking direction to form a negative electrode 10B 1 and subjected to the negative electrode material layer 12B on both main surfaces as an example.
  • bonding the separator 50 on both main surfaces of the negative electrode 10B 1 to form an electrode structure layer precursor 100A researchera (see FIGS. 1A and 1B).
  • the positive electrode 10A ′, the negative electrode 10B ′, and the separator 50 ′ had to be individually cut, whereas in one embodiment of the present invention, the electrode constituent layer precursor was After forming 100 ⁇ , the electrode constituent layer precursor 100 ⁇ is cut along the stacking direction. By this cutting, the side surface of the cut electrode constituent layer precursor 100 ⁇ can be made substantially flush (see FIG. 1C).
  • the number of cuts is two due to the individual cutting (see FIG. 5).
  • the number of cuttings is caused by cutting after the integral formation. Is once.
  • the negative electrode 10B and the separator 50 are integrated to form the electrode constituent layer precursor, the negative electrode 10B cut along the stacking direction is aligned along the stacking direction. There is no need to align, that is, handle, the separator 50 that has been cut.
  • the number of cuts is relatively small compared to the conventional technical knowledge of those skilled in the art, and the separator 50 cut along the stacking direction with respect to the negative electrode cut along the stacking direction. No alignment is required. Therefore, due to this, it is possible to suitably shorten the manufacturing time of the electrode constituent layer obtained by further bonding the positive electrode to the separator 50 of the cut electrode constituent layer precursor 100 ⁇ .
  • the manufacturing time of the electrode constituent layer obtained by stacking a plurality of the electrode constituent layers along the stacking direction can be suitably shortened. By suitably shortening the manufacturing time of such an electrode assembly, it becomes possible to suitably improve the manufacturing efficiency of the secondary battery having the electrode assembly finally obtained.
  • the separator 50 in the step (i), it is preferable to adhere the separator 50 to both the main surfaces 10B 11 and 10B 12 of the negative electrode 10B 1 prior to forming the electrode constituent layer precursor 100 ⁇ 1 (FIG. 2). See upper left area).
  • the negative electrode 10B 1 is composed of a negative electrode current collector 11B 1 and a negative electrode material layer 12B 1 provided on both main surfaces of the negative electrode current collector 11B 1
  • the positive electrode laminated via a separator 50 due to the negative electrode material layer 12B 1 is subjected to both main surfaces of the anode current collector 11B 1, the separator on both main surfaces 10B 11, 10B 12 of the negative electrode 10B 1 50 need to be glued.
  • the separator 50 is bonded (hot press or the like) to both the main surfaces 10B 11 and 10B 12 of the negative electrode 10B 1 to form the electrode constituent layer precursor 100 ⁇ 1 (see FIG. 2).
  • the electrode structure layer precursor 100A researchera 1 after forming the electrode structure layer precursor 100A researchera 1, the electrode structure layer precursor 100Arufa 1 cut along the stacking direction. Such cutting, the sides of disconnected electrode configurations layer precursor 100Beta 1 can be substantially flush shape (see FIG. 2 the central region).
  • the separator 50 in the step of the above (i), prior to forming the electrode structure layer precursor 100A researchera 2, it is preferable to adhere the separator 50 only on one main surface 10B 21 of the negative electrode 10B 2 (FIG. 2 upper right Area reference).
  • this aspect can be used for outermost layer area
  • the number of times of cutting is one less than the conventional technical knowledge of those skilled in the art, and the alignment of the separator 50 cut along the stacking direction with respect to the negative electrode cut along the stacking direction is not necessary.
  • production time of the electrode structure layer 300 obtained by further bonding the positive electrode 10A 2 on the separator 50 of the disconnected electrode configurations layer precursor 100Beta 2 due to this can be suitably reduced.
  • the manufacturing time of the electrode assembly 500 obtained by stacking a plurality of the electrode constituent layers 300 along the stacking direction can be suitably shortened.
  • the positive electrode 10A (10A 1 , 10A 2 ) is further added to the separator 50 of the cut electrode constituent layer precursor 100 ⁇ (100 ⁇ 1 , 100 ⁇ 2 ) along the stacking direction. It is preferable to adhere (see FIG. 2).
  • the positive electrode 10A of the handling of the separator 50 is cut into a predetermined shape to be omitted It is possible to relatively shorten the time required for adhering to the separator 50 (hot pressing or the like). That is, the manufacturing time of the electrode constituent layer 300 obtained by further bonding the positive electrode 10 on the separator 50 of the cut electrode constituent layer precursor 100 ⁇ can be suitably shortened.
  • the number of times of cutting can be reduced as compared with the case where the separator provided for each is individually cut. As a result, the manufacturing time of the electrode constituent layer obtained by further bonding the positive electrode onto the cut electrode constituent layer precursor separator 50 can be suitably shortened.
  • the electrode constituent layer precursor 100 ⁇ is formed by bonding (hot pressing or the like) of the separator 50 to at least one main surface of the negative electrode 10B and the negative electrode 10B along the stacking direction
  • the electrode constituent layer precursor is formed.
  • 100 ⁇ is cut along the stacking direction.
  • the electrode constituent layer precursor 100 ⁇ is cut along the stacking direction so that a non-rectangular electrode constituent layer precursor is obtained in plan view after cutting.
  • non-rectangular shape refers to a shape in which the shape of the electrode / electrode constituent layer precursor in a plan view is not normally included in the concept of a rectangular shape such as a square and a rectangle.
  • non-rectangular shape refers to a shape in which the shape of the electrode / electrode constituent layer precursor in a plan view as viewed from above in the thickness direction is not a square or a rectangle.
  • the electrode / electrode constituent layer precursor has a square / rectangular base shape, but is partially cut away from it (preferably a square / rectangular corner portion of the base is cut out). It points to that.
  • the case where the negative electrode and the separator are individually cut into a rectangular shape in plan view is more attributable to the shape. Cutting with high accuracy can be relatively difficult. Further, alignment between the non-rectangular negative electrode and the non-rectangular separator in a plan view after cutting may be relatively difficult due to the shape as compared with the rectangular shape.
  • the electrode constituent layer precursor 100 ⁇ integrally formed by bonding the negative electrode 10B and the separator 50 provided on at least one main surface of the negative electrode 10B is cut, it becomes relatively difficult.
  • the number of cutting operations with high accuracy can be reduced, and alignment between the non-rectangular negative electrode and the non-rectangular separator can be avoided. This is an advantageous effect of this embodiment.
  • the non-rectangular negative electrode, the separator, and the positive electrode are individually formed in a plan view according to the common general knowledge of those skilled in the art.
  • the above-described high-precision cutting and the relative difficulty that can be relatively difficult are formed.
  • Each possible alignment of each layer is required.
  • cutting with high accuracy, which can be relatively difficult is non-rectangular in plan view as compared with the case where the non-rectangular negative electrode, separator, and positive electrode are individually formed in plan view. It is required only when forming a shaped electrode constituent layer precursor and when forming a non-rectangular positive electrode in plan view.
  • this aspect is relatively different from the previous aspect in which the non-rectangular negative electrode, the non-rectangular separator, and the non-rectangular positive electrode are individually formed and aligned in plan view. Therefore, it is possible to reduce the number of times of cutting with high accuracy that can be difficult in general and the number of times of alignment of layers that can be relatively difficult. As a result of the reduction in the number of times, the manufacturing time of the electrode constituent layer obtained by further bonding the positive electrode on the separator 50 of the cut electrode constituent layer precursor can be shortened more suitably than before.
  • the production time of the electrode assembly 500 obtained by laminating a plurality of the electrode construction layers 300 along the laminating direction can be more suitably shortened by more suitable shortening of the production time of the electrode construction layer 300.
  • 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 300 Electrode constituent layer 100 ⁇ , 100 ⁇ 1 , 100 ⁇ 2 Electrode constituent layer precursor (before cutting) 100 ⁇ , 100 ⁇ 1 , 100 ⁇ 2 electrode constituent layer precursor (after cutting) 50, 50 'separator 10A, 10A 1, 10A 2, 10A' positive 10B, 10B 1, 10B 2, 10B ' negative 10B 11, 10B 12, 10B 21 negative electrode of the main surface 11A, 11A' cathode current collector 11B, 11B 1 , 11B 2 , 11B ′ Negative electrode current collector 12A, 12A ′ Positive electrode material layer 12B, 12B 1 , 12B 2 , 12B ′ Negative electrode material layer 20B Tab

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  • Manufacturing & Machinery (AREA)
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  • General Chemical & Material Sciences (AREA)
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Abstract

Un mode de réalisation de la présente invention concerne un procédé de production d'une batterie secondaire comprenant un corps assemblé d'électrode (500) ayant une structure stratifiée plane, une pluralité de couches constitutives d'électrode (300) étant empilées sous une forme plane, chacune contenant une électrode positive (10A), une électrode négative (10B) et un séparateur (50), comme le montre une vue en coupe transversale. En particulier, le mode de réalisation de la présente invention comprend au moins (i) une étape d'adhérence, suivant une direction de stratification, d'un séparateur (50) sur au moins l'une des surfaces principales de l'électrode négative (10B), pour former un précurseur de couche constitutive d'électrode (100α) ayant l'électrode négative (10B) et le séparateur (50), et (ii) une étape de découpe du précurseur de couche constitutive d'électrode (100α) suivant la direction de stratification.
PCT/JP2018/005751 2017-03-07 2018-02-19 Procédé de production de batterie secondaire WO2018163775A1 (fr)

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JP2017043000 2017-03-07
JP2017-043000 2017-03-07

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WO2022264406A1 (fr) * 2021-06-18 2022-12-22 ＴｅｒａＷａｔｔ Ｔｅｃｈｎｏｌｏｇｙ株式会社 Batterie secondaire au lithium

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JPH10275628A (ja) * 1997-03-28 1998-10-13 Japan Storage Battery Co Ltd 電池の製造方法
WO2012081331A1 (fr) * 2010-12-16 2012-06-21 東レエンジニアリング株式会社 Procédé de fabrication d'un accumulateur secondaire et dispositif de fabrication
WO2018021263A1 (fr) * 2016-07-28 2018-02-01 三洋電機株式会社 Procédé de fabrication de batterie rechargeable

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10275628A (ja) * 1997-03-28 1998-10-13 Japan Storage Battery Co Ltd 電池の製造方法
WO2012081331A1 (fr) * 2010-12-16 2012-06-21 東レエンジニアリング株式会社 Procédé de fabrication d'un accumulateur secondaire et dispositif de fabrication
WO2018021263A1 (fr) * 2016-07-28 2018-02-01 三洋電機株式会社 Procédé de fabrication de batterie rechargeable

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022264406A1 (fr) * 2021-06-18 2022-12-22 ＴｅｒａＷａｔｔ Ｔｅｃｈｎｏｌｏｇｙ株式会社 Batterie secondaire au lithium

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