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WO2018150700A1 - Module de stockage d'énergie et procédé de fabrication de module de stockage d'énergie - Google Patents

Module de stockage d'énergie et procédé de fabrication de module de stockage d'énergie Download PDF

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Publication number
WO2018150700A1
WO2018150700A1 PCT/JP2017/044191 JP2017044191W WO2018150700A1 WO 2018150700 A1 WO2018150700 A1 WO 2018150700A1 JP 2017044191 W JP2017044191 W JP 2017044191W WO 2018150700 A1 WO2018150700 A1 WO 2018150700A1
Authority
WO
WIPO (PCT)
Prior art keywords
thickness
electrode plate
stacking direction
peripheral portion
outer peripheral
Prior art date
Application number
PCT/JP2017/044191
Other languages
English (en)
Japanese (ja)
Inventor
田丸耕二郎
Original Assignee
株式会社豊田自動織機
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社豊田自動織機 filed Critical 株式会社豊田自動織機
Publication of WO2018150700A1 publication Critical patent/WO2018150700A1/fr

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/183—Sealing members
    • H01M50/186—Sealing members characterised by the disposition of the sealing members
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/10—Multiple hybrid or EDL capacitors, e.g. arrays or modules
    • H01G11/12—Stacked hybrid or EDL capacitors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/78—Cases; Housings; Encapsulations; Mountings
    • H01G11/80—Gaskets; Sealings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/84—Processes for the manufacture of hybrid or EDL capacitors, or components thereof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/24—Alkaline accumulators
    • H01M10/30—Nickel accumulators
    • 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
    • H01M4/64—Carriers or collectors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/183—Sealing members
    • H01M50/184—Sealing members characterised by their shape or structure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/183—Sealing members
    • H01M50/19—Sealing members characterised by the material
    • H01M50/193—Organic material
    • 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 power storage module and a method for manufacturing the power storage module.
  • a bipolar battery having a bipolar electrode in which a positive electrode is formed on one surface of a current collector and a negative electrode is formed on the other surface is known.
  • a plurality of bipolar electrodes are stacked in series across an electrolyte layer.
  • the electrolyte layer is held by the separator.
  • a sealing resin member is disposed on the outer peripheral portion of the separator where the electrolyte is held.
  • a sealing member is provided in order to prevent electrolyte solution, gas, and the like from flowing into adjacent cells.
  • the sealing performance of the sealing member in the bipolar battery is important. For example, if a sealing failure occurs, productivity may be reduced.
  • a power storage module in which a first seal portion that holds the peripheral portion of the electrode plate is formed and a second seal portion is formed outside the first seal portion in a direction perpendicular to the stacking direction in which the bipolar electrodes are stacked is conceivable.
  • a frame body 70 serving as a first seal portion is formed on an inner peripheral portion 71 formed on a peripheral portion 34 a of the electrode plate 34, and on the outer side of the inner peripheral portion 71.
  • a gap G can be formed between the outer peripheral portions 72 that are adjacent in the stacking direction.
  • the resin material is injected into the mold, and the second seal The part is injection molded.
  • the outer peripheral portion 72 of the frame body 70 may be deformed (for example, rolled up). Such deformation of the frame body 70 may lead to a state in which the second seal portion is not properly joined to the first seal portion, which may cause a seal failure.
  • An object of the present invention is to provide a power storage module and a method for manufacturing the power storage module that can reduce a sealing failure.
  • One embodiment of the present invention is an electricity storage in which a plurality of bipolar electrodes each including a positive electrode provided on an electrode plate and a first surface of the electrode plate and a negative electrode provided on a second surface of the electrode plate are stacked via a separator.
  • the module includes a cylindrical resin portion that extends in the stacking direction of the plurality of bipolar electrodes and accommodates the plurality of bipolar electrodes, and the resin portion is a cylindrical first member joined to the peripheral portion of the electrode plate.
  • a seal portion, and a cylindrical second seal portion provided in a sealed state with the first seal portion on the outside of the first seal portion in a direction intersecting the stacking direction.
  • the frame body joined to the peripheral portion of the electrode plate has a structure in which the frame body is laminated in the laminating direction, and the frame body is disposed on at least one surface side of the first surface or the second surface of the electrode plate, Continuously connected to the inner periphery joined to one surface and the outer periphery Vignetting, wherein an outer peripheral portion abutting on another frame adjacent to the stacking direction, the thickness of the outer peripheral portion in the stacking direction is greater than the thickness of the inner peripheral portion in the stacking direction.
  • the frame of the first seal portion has an inner peripheral portion joined to the electrode plate and an outer peripheral portion outside the inner peripheral portion.
  • the outer peripheral portion of the frame body is in contact with another frame body adjacent in the stacking direction. Since the thickness of the outer peripheral portion in the stacking direction is larger than the thickness of the inner peripheral portion in the stacking direction, the outer peripheral portions adjacent to each other in the stacking direction are in contact with each other in the stacked state, and a gap is formed between them. Hateful. Therefore, when the second seal portion is formed after the frames are stacked, the resin material of the second seal portion is suppressed from entering between the frames of the first seal portion. Thereby, it is prevented that the outer peripheral part of a frame deform
  • the thickness of the outer peripheral portion in the stacking direction may be substantially equal to the sum of the thickness of the inner peripheral portion in the stacking direction and the thickness of the electrode plate.
  • the end surface in the stacking direction of the outer peripheral portion and the end surface in the stacking direction of the inner peripheral portion tend to be flush with each other. Therefore, the outer peripheral parts and inner peripheral parts which adjoin in the lamination direction contact
  • the frames can be brought into close contact with each other, and deformation of the outer periphery of the frame is reliably prevented when the second seal portion is formed.
  • the separator is disposed between a plurality of bipolar electrodes and is compressed in the stacking direction with the positive electrode and the negative electrode being in contact with both sides in the stacking direction, and the thickness of the outer peripheral portion in the stacking direction is: It may be smaller than the sum of the thickness of the electrode plate, the thickness of the positive electrode, the thickness of the negative electrode, and the thickness of the separator before compression in the stacking direction. In this case, when a plurality of bipolar electrodes are stacked via the separator, the separator is compressed. The amount of compression of this separator can be determined by the thickness of the outer periphery of the frame.
  • the thickness of the outer peripheral portion of the frame can approximate the sum of the thickness of the electrode plate, the thickness of the positive electrode, the thickness of the negative electrode, and the thickness of the separator after compression. Thereby, a gap is not formed between the outer peripheral portions adjacent to each other in the stacking direction, and the second seal portion is appropriately joined to the first seal portion.
  • a method of manufacturing a power storage module comprising: a plurality of bipolar electrodes each including an electrode plate, a positive electrode provided on the first surface of the electrode plate, and a negative electrode provided on the second surface of the electrode plate.
  • each inner peripheral portion of the frame body is joined to at least one surface of the electrode plate, and each outer peripheral portion of the frame body protrudes outward from the peripheral portion of the electrode plate in a direction crossing the stacking direction.
  • the thickness of the outer peripheral portion forms a frame body so as to be larger than the thickness of the inner peripheral portion in the stacking direction in the stacking direction, in the laminating step, is brought into contact with the outer peripheral portion of the frame adjacent in the stacking direction.
  • sealing failure can be reduced.
  • FIG. 3A is a cross-sectional view showing a state before the bipolar battery is stacked
  • FIG. 3B is a cross-sectional view showing the peripheral structure of the resin portion in the power storage module.
  • 4 (a) to 4 (c) are diagrams showing a manufacturing procedure of the bipolar battery with a frame shown in FIG. 3 (a).
  • FIG. 5A is a cross-sectional view showing the structure of a bipolar battery with a frame in a power storage module according to a reference embodiment
  • FIG. 5B is an example of a molded state of the second seal portion in the module of FIG. It is sectional drawing shown.
  • the power storage device 10 shown in FIG. 1 is used as a battery for various vehicles such as forklifts, hybrid vehicles, and electric vehicles.
  • the power storage device 10 includes a plurality (three in the present embodiment) of power storage modules 12, but may include a single power storage module 12.
  • the power storage module 12 is a bipolar battery.
  • the power storage module 12 is a secondary battery such as a nickel hydride secondary battery or a lithium ion secondary battery, but may be an electric double layer capacitor. In the following description, a nickel metal hydride secondary battery is illustrated.
  • the plurality of power storage modules 12 can be stacked via a conductive plate 14 such as a metal plate, for example.
  • a conductive plate 14 such as a metal plate, for example.
  • the conductive plates 14 are also arranged outside the power storage modules 12 positioned at both ends in the stacking direction (Z direction) of the power storage modules 12.
  • the conductive plate 14 is electrically connected to the adjacent power storage module 12. Thereby, the some electrical storage module 12 is connected in series in the lamination direction.
  • a positive electrode terminal 24 is connected to the conductive plate 14 located at one end
  • a negative electrode terminal 26 is connected to the conductive plate 14 located at the other end.
  • the positive terminal 24 may be integrated with the conductive plate 14 to be connected.
  • the negative electrode terminal 26 may be integrated with the conductive plate 14 to be connected.
  • the positive electrode terminal 24 and the negative electrode terminal 26 extend in a direction (X direction) intersecting the stacking direction.
  • the positive and negative terminals 24 and 26 can charge and discharge the power storage device 10.
  • the conductive plate 14 can also function as a heat radiating plate for releasing heat generated in the power storage module 12.
  • a refrigerant such as air or liquid passes through the plurality of gaps 14a provided inside the conductive plate 14, heat from the power storage module 12 can be efficiently released to the outside.
  • Each gap 14a extends, for example, in a direction (Y direction) intersecting the stacking direction.
  • the conductive plate 14 is smaller than the power storage module 12, but may be the same as or larger than the power storage module 12.
  • the power storage device 10 may include a restraining member 16 that restrains the alternately stacked power storage modules 12 and conductive plates 14 in the stacking direction.
  • the restraining member 16 includes a pair of restraining plates 16A and 16B and a connecting member (bolt 18 and nut 20) for joining the restraining plates 16A and 16B to each other.
  • An insulating film 22 such as a resin film is disposed between the restraining plates 16A and 16B and the conductive plate.
  • Each restraint plate 16A, 16B is comprised, for example with metals, such as iron.
  • each of the restraining plates 16A and 16B and the insulating film 22 has, for example, a rectangular shape.
  • the insulating film 22 is larger than the conductive plate 14, and the restraining plates 16 ⁇ / b> A and 16 ⁇ / b> B are larger than the power storage module 12.
  • an insertion hole 16A1 through which the shaft portion of the bolt 18 is inserted is provided at a position on the outer side of the power storage module 12 at the edge portion of the restraint plate 16A.
  • an insertion hole 16 ⁇ / b> B ⁇ b> 1 through which the shaft part of the bolt 18 is inserted is provided at a position on the outer side of the power storage module 12 at the edge of the restraint plate 16 ⁇ / b> B when viewed from the stacking direction.
  • the insertion hole 16A1 and the insertion hole 16B1 are located at the corners of the restraint plates 16A, 16B.
  • One constraining plate 16A is abutted against the conductive plate 14 connected to the negative terminal 26 via the insulating film 22, and the other constraining plate 16B has the insulating film 22 applied to the conductive plate 14 connected to the positive terminal 24.
  • the bolt 18 is passed through the insertion hole 16A1 and the insertion hole 16B1 from the one restraint plate 16A side toward the other restraint plate 16B side.
  • a nut 20 is screwed onto the tip of the bolt 18 protruding from the other restraining plate 16B. Accordingly, the insulating film 22, the conductive plate 14, and the power storage module 12 are sandwiched and unitized, and a restraining load is applied in the stacking direction.
  • the power storage module 12 illustrated in FIG. 2 includes a stacked body 30 in which a plurality of bipolar electrodes 32 are stacked. When viewed from the stacking direction of the bipolar electrode 32, the stacked body 30 has, for example, a rectangular shape. A separator 40 may be disposed between the adjacent bipolar electrodes 32.
  • Each bipolar electrode 32 includes an electrode plate 34, a positive electrode 36 provided on the first surface 34 c of the electrode plate 34, and a negative electrode 38 provided on the second surface 34 d of the electrode plate 34.
  • the positive electrode 36 of one bipolar electrode 32 faces the negative electrode 38 of one bipolar electrode 32 adjacent in the stacking direction across the separator 40, and the negative electrode 38 of one bipolar electrode 32 connects the separator 40. It faces the positive electrode 36 of the other bipolar electrode 32 that is adjacent in the stacking direction.
  • an electrode plate 34 having a negative electrode 38 disposed on the inner surface (the lower surface in the drawing) is disposed at one end of the stacked body 30.
  • the electrode plate 34 corresponds to a negative terminal electrode.
  • an electrode plate 34 having a positive electrode 36 disposed on the inner surface (the upper surface in the drawing) is disposed at the other end of the stacked body 30.
  • This electrode plate 34 corresponds to a positive terminal electrode.
  • the negative electrode 38 of the negative electrode-side termination electrode faces the positive electrode 36 of the uppermost bipolar electrode 32 with the separator 40 interposed therebetween.
  • the positive electrode 36 of the positive terminal electrode is opposed to the negative electrode 38 of the lowermost bipolar electrode 32 with the separator 40 interposed therebetween.
  • the electrode plates 34 of these termination electrodes are connected to the adjacent conductive plates 14 (see FIG. 1).
  • the power storage module 12 includes a cylindrical resin portion 50 that extends in the stacking direction of the bipolar electrodes 32 and accommodates the stacked body 30.
  • the resin part 50 holds the peripheral edge part 34 a of the plurality of electrode plates 34.
  • the resin part 50 is configured to surround the laminated body 30.
  • the resin portion 50 has, for example, a rectangular shape when viewed from the lamination direction of the bipolar electrode 32. That is, the resin part 50 is, for example, a rectangular tube shape.
  • the resin part 50 is joined to the peripheral part 34a of the electrode plate 34, and the first seal part 52 that holds the peripheral part 34a and the first seal part 52 in the direction (X direction and Y direction) intersecting the stacking direction.
  • 2nd seal part 54 provided in the outside.
  • the second seal portion 54 is provided in a state of being sealed with the first seal portion 52.
  • the 1st seal part 52 which constitutes the inner wall of resin part 50 is provided over the perimeter of peripheral part 34a of electrode board 34 in a plurality of bipolar electrodes 32 (namely, layered product 30).
  • the first seal portion 52 is welded, for example, to the peripheral portion 34a of the electrode plate 34, and seals the peripheral portion 34a. That is, the first seal part 52 is joined to the peripheral edge part 34 a of the electrode plate 34.
  • the peripheral edge 34 a of the electrode plate 34 of each bipolar electrode 32 is held in a state of being buried in the first seal portion 52.
  • the peripheral portions 34 a of the electrode plates 34 disposed at both ends of the stacked body 30 are also held in a state of being buried in the first seal portion 52.
  • an internal space that is airtightly partitioned by the electrode plates 34 and 34 and the first seal portion 52 is formed between the electrode plates 34 and 34 adjacent in the stacking direction.
  • An electrolytic solution (not shown) made of an alkaline solution such as an aqueous potassium hydroxide solution is accommodated in the internal space.
  • the second seal part 54 constituting the outer wall of the resin part 50 covers the outer peripheral surface 52a of the first seal part 52 extending in the stacking direction of the bipolar electrodes 32.
  • the inner peripheral surface 54a of the second seal portion 54 is welded, for example, to the outer peripheral surface 52a of the first seal portion 52, and seals the outer peripheral surface 52a. That is, the second seal portion 54 is joined to the outer peripheral surface 52 a of the first seal portion 52.
  • the welding surface (joint surface) of the second seal portion 54 with respect to the first seal portion 52 forms, for example, four rectangular planes.
  • the electrode plate 34 is a rectangular metal foil made of nickel, for example.
  • the peripheral edge 34a of the electrode plate 34 is an uncoated region where the positive electrode active material and the negative electrode active material are not coated. In the uncoated region, the electrode plate 34 is exposed. The uncoated region is buried and held in the first seal portion 52 constituting the inner wall of the resin portion 50.
  • An example of the positive electrode active material constituting the positive electrode 36 is nickel hydroxide.
  • Examples of the negative electrode active material constituting the negative electrode 38 include a hydrogen storage alloy.
  • the formation region of the negative electrode 38 on the second surface 34 d of the electrode plate 34 may be slightly larger than the formation region of the positive electrode 36 on the first surface 34 c of the electrode plate 34.
  • the separator 40 is formed in a sheet shape, for example.
  • the separator 40 has a rectangular shape, for example.
  • Examples of the material forming the separator 40 include a porous film made of a polyolefin resin such as polyethylene (PE) and polypropylene (PP), and a woven fabric or a nonwoven fabric made of polypropylene.
  • the separator 40 may be reinforced with a vinylidene fluoride resin compound or the like.
  • the resin part 50 (the first seal part 52 and the second seal part 54) is formed in a rectangular cylindrical shape by, for example, injection molding using an insulating resin.
  • the resin material constituting the resin portion 50 include polypropylene (PP), polyphenylene sulfide (PPS), and modified polyphenylene ether (modified PPE).
  • the first seal portion 52 has a structure in which frame bodies 60 joined to the peripheral edge portion 34a of the electrode plate 34 are stacked in the stacking direction.
  • the frame body 60 that is a sealing component is, for example, provided on the first surface 34 c side of the electrode plate 34 and joined to the first surface 34 c and continuously provided on the outer side of the inner peripheral portion 61.
  • the outer peripheral part 62 is included.
  • the inner peripheral portion 61 and the outer peripheral portion 62 are integrated.
  • the second end surface 61 b of the inner peripheral portion 61 is joined to the first surface 34 c in the peripheral portion 34 a of the electrode plate 34.
  • the inner peripheral portion 61 forms an inner peripheral end 52c (see FIG. 2) of the first seal portion 52.
  • the outer peripheral part 62 contacts the outer peripheral part 62 of another frame 60 adjacent in the stacking direction.
  • the outer peripheral portion 62 forms the outer peripheral end 52d (that is, the outer peripheral surface 52a) of the first seal portion 52.
  • the frame 60 defines the height (thickness) in the stacking direction of the bipolar electrode 32 and the separator 40 to be stacked.
  • the first end surface 60a of the frame body 60 is in contact with the second end surface 62b of the outer peripheral portion 62 of another frame body 60 and the second surface 34d side of the peripheral edge portion 34a.
  • the first end surface 61a of the inner peripheral portion 61 and the first end surface 62a of the outer peripheral portion 62 are, for example, flush with each other.
  • the second end surface 62b of the outer peripheral portion 62 and the second surface 34d side of the peripheral edge portion 34a are, for example, flush with each other.
  • the separator 40 is disposed between the plurality of bipolar electrodes 32 and is compressed in the stacking direction with the positive electrode 36 and the negative electrode 38 being in contact with both sides in the stacking direction.
  • the thickness t2 of the outer peripheral portion 62 in the stacking direction is larger than the thickness t1 of the inner peripheral portion 61 in the stacking direction. That is, the length between the first end surface 62a and the second end surface 62b of the outer peripheral portion 62 is larger than the length of the first end surface 61a and the second end surface 61b of the inner peripheral portion 61.
  • the thickness t2 of the outer peripheral portion 62 in the stacking direction is substantially equal to the sum of the thickness t1 of the inner peripheral portion 61 and the thickness of the electrode plate 34 in the stacking direction.
  • the thickness of the outer peripheral portion 62 in the stacking direction is smaller than the sum of the thickness of the electrode plate 34, the thickness of the positive electrode 36, the thickness of the negative electrode 38, and the thickness of the separator 40 before compression in the stacking direction.
  • the second seal portion 54 is joined to the outer peripheral surface 52 a of the first seal portion 52 without entering between the frame bodies 60.
  • the positive electrode 36 is formed on the first surface 34c of the electrode plate 34, and the negative electrode 38 is formed on the second surface 34d of the electrode plate 34 to obtain the bipolar electrode 32 ( Preparation step).
  • the frame body 60 is joined to the peripheral edge 34a of the electrode plate 34 of the bipolar electrode 32 (first sealing step).
  • the frame body 60 may be welded to the peripheral edge 34 a by performing hot pressing from the upper and lower surfaces of the bipolar electrode 32.
  • the frame body 60 When the frame body 60 is welded to the peripheral edge 34a by hot pressing, the frame body 60 may be formed using a hot pressing mold.
  • the first type M1 and the second type M2 are used.
  • the inner peripheral portion 61 of the frame body 60 is pressed so as to be joined to the first surface 34c of the electrode plate 34 by the flat surface portion M1b of the first mold M1.
  • the outer peripheral portion 62 projects outward from the peripheral edge portion 34 a of the electrode plate 34, and further enters the outer peripheral side of the peripheral edge portion 34 a of the electrode plate 34.
  • the mating surface M1a of the first mold M1 and the mating surface M2a of the second mold M2 are combined, the second end surface 62b of the outer peripheral portion 62 is flush with the second surface 34d of the peripheral portion 34a.
  • the mold for hot pressing may be made of resin, for example.
  • a fluororesin mold made of PTFE (polytetrafluoroethylene), PFA (tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer), or the like may be used. In that case, mixing of the conductive foreign matter into the frame 60 can be prevented.
  • the frame body 60 is formed in which the thickness t2 of the outer peripheral portion 62 in the stacking direction is larger than the thickness t1 of the inner peripheral portion 61 in the stacking direction.
  • a plurality of bipolar electrodes 32 to which the frame body 60 is bonded are stacked via the separator 40 (see FIG. 3B) to obtain the stacked body 30 (stacking step).
  • the outer peripheral part 62 of the frame 60 abuts on the outer peripheral part 62 of another frame 60 adjacent in the stacking direction.
  • the separator 40 is more compressed in the state of the laminated body 30 (a state in which the positive electrode 36 and the negative electrode 38 are in contact with each other) than in the state before the lamination.
  • a gap is not formed between the outer peripheral portions 62 of the frame body 60 due to the relationship between the thicknesses of the respective members described above.
  • the second seal portion 54 is formed by, for example, injection molding (second seal step).
  • the second seal portion 54 can be formed by pouring a resin material of the second seal portion 54 having fluidity into the mold.
  • an electrolytic solution is injected into the resin part 50 through an injection port or the like.
  • the storage module 12 is manufactured by sealing the injection port.
  • a plurality of power storage modules 12 are stacked via the conductive plate 14.
  • a positive electrode terminal 24 and a negative electrode terminal 26 are connected in advance to the conductive plates 14 located at both ends in the stacking direction.
  • a pair of restraint plates 16A and 16B are respectively disposed at both ends in the stacking direction via the insulating film 22, and the restraint plates 16A and 16B are connected to each other using the bolt 18 and the nut 20. In this way, the power storage device 10 shown in FIG. 1 is manufactured.
  • the frame body 60 of the first seal portion 52 includes the inner peripheral portion 61 joined to the electrode plate 34 and the outer periphery outside the inner peripheral portion 61. Part 62.
  • the outer peripheral part 62 of the frame body 60 contacts another frame body 60 adjacent in the stacking direction. Since the thickness t2 of the outer peripheral portion 62 in the stacking direction is larger than the thickness t1 of the inner peripheral portion 61 in the stacking direction, the outer peripheral portions 62 adjacent to each other in the stacking direction are in contact with each other in a state where the frame bodies 60 are stacked. It is difficult to form a gap between them.
  • the resin material of the second seal portion 54 is suppressed from entering between the frame bodies 60 of the first seal portion 52.
  • the outer peripheral portion 62 of the frame body 60 is prevented from being deformed, and the second seal portion 54 is appropriately joined to the first seal portion 52. Therefore, the sealing failure can be reduced.
  • the outer peripheral portion 72 in the outermost layer can be prevented from rolling up.
  • the thickness t2 of the outer peripheral portion 62 in the stacking direction is substantially equal to the sum of the thickness of the inner peripheral portion 61 and the thickness of the electrode plate 34 in the stacking direction.
  • the first end surface 62a in the stacking direction of the outer peripheral portion 62 and the first end surface 61a in the stacking direction of the inner peripheral portion 61 are likely to be flush with each other. Therefore, the outer peripheral portions 62 and the inner peripheral portions 61 that are adjacent to each other in the stacking direction come into contact with each other in a state where the frame bodies 60 are stacked.
  • the frame bodies 60 can be brought into close contact with each other, and deformation of the outer peripheral portion 62 of the frame body 60 is reliably prevented when the second seal portion 54 is formed.
  • the thickness of the outer peripheral portion 62 in the stacking direction is smaller than the sum of the thickness of the electrode plate 34, the thickness of the positive electrode 36, the thickness of the negative electrode 38, and the thickness of the separator 40 before compression in the stacking direction.
  • the amount of compression of the separator 40 can be determined by the thickness of the outer peripheral portion 62 of the frame body 60.
  • the thickness of the outer peripheral portion 62 of the frame 60 can be approximated to the sum of the thickness of the electrode plate 34, the thickness of the positive electrode 36, the thickness of the negative electrode 38, and the thickness of the separator 40 after compression. Accordingly, no gap is formed between the outer peripheral portions 62 adjacent in the stacking direction, and the second seal portion 54 is appropriately joined to the first seal portion 52.
  • one frame body 60 is provided only on the first surface 34c side of the electrode plate 34.
  • One frame 60 may be provided only on the second surface 34 d side of the electrode plate 34.
  • one frame 60 may be welded (joined) to the second surface 34d side of the electrode plate 34 by hot pressing or the like.
  • One frame 60 may be provided on the first surface 34 c side of the electrode plate 34, and another one frame 60 may be provided on the second surface 34 d side of the electrode plate 34.
  • each frame 60 may be welded (joined) to the first surface 34c and the second surface 34d side of the electrode plate 34 by hot pressing or the like.
  • the thickness of the frame 60 satisfies the same relationship as in the above embodiment.
  • the frame body 60 is provided on each of the first surface 34c side and the second surface 34d side of one electrode plate 34, the total thickness of the two outer peripheral portions 62 and the total thickness of the two inner peripheral portions 61 are thus, the same relationship as in the above embodiment is satisfied.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Secondary Cells (AREA)
  • Electric Double-Layer Capacitors Or The Like (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
  • Cell Electrode Carriers And Collectors (AREA)
  • Cell Separators (AREA)

Abstract

L'invention concerne un module de stockage d'énergie muni d'une partie en résine cylindrique logeant une pluralité d'électrodes bipolaires. La partie en résine comprend : une première partie d'étanchéité qui a une forme cylindrique et est liée à une partie de bord périphérique d'une plaque d'électrode ; et une seconde partie d'étanchéité qui a une forme cylindrique et est disposée dans un état d'étanchéité avec la première partie d'étanchéité. La première partie d'étanchéité a une structure dans laquelle un corps de cadre lié à la partie de bord périphérique de la plaque d'électrode est stratifié dans une direction de stratification. Le corps de cadre est disposé sur au moins une surface parmi une première surface et une seconde surface de la plaque d'électrode et comprend une partie périphérique interne liée à la au moins une surface et une partie périphérique externe qui fait contact avec un autre corps de cadre qui est adjacent dans la direction de stratification. L'épaisseur de la partie périphérique externe dans la direction de stratification est plus grande que celle de la partie périphérique interne dans la direction de stratification.
PCT/JP2017/044191 2017-02-16 2017-12-08 Module de stockage d'énergie et procédé de fabrication de module de stockage d'énergie WO2018150700A1 (fr)

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JP2017-027129 2017-02-16
JP2017027129A JP2018133251A (ja) 2017-02-16 2017-02-16 蓄電モジュール及び蓄電モジュールの製造方法

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JP2020082512A (ja) * 2018-11-26 2020-06-04 株式会社豊田自動織機 蓄電モジュールの製造方法及び蓄電モジュール
CN112448074A (zh) * 2019-08-28 2021-03-05 北京好风光储能技术有限公司 一种双极性电池堆
CN113632190A (zh) * 2019-03-29 2021-11-09 株式会社丰田自动织机 蓄电模块
WO2023285553A1 (fr) * 2021-07-14 2023-01-19 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Réacteur électrochimique soudé et son procédé de fabrication

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JP7161356B2 (ja) * 2018-09-25 2022-10-26 株式会社豊田自動織機 蓄電モジュールの製造方法
JP7468233B2 (ja) * 2020-07-31 2024-04-16 株式会社豊田自動織機 蓄電モジュール

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JP2020082512A (ja) * 2018-11-26 2020-06-04 株式会社豊田自動織機 蓄電モジュールの製造方法及び蓄電モジュール
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CN113632190A (zh) * 2019-03-29 2021-11-09 株式会社丰田自动织机 蓄电模块
CN113632190B (zh) * 2019-03-29 2023-11-28 株式会社丰田自动织机 蓄电模块
CN112448074A (zh) * 2019-08-28 2021-03-05 北京好风光储能技术有限公司 一种双极性电池堆
CN112448074B (zh) * 2019-08-28 2022-10-25 北京好风光储能技术有限公司 一种双极性电池堆
WO2023285553A1 (fr) * 2021-07-14 2023-01-19 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Réacteur électrochimique soudé et son procédé de fabrication

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