WO2011070918A1 - Dispositif de stockage d'électricité et son procédé de fabrication - Google Patents

Dispositif de stockage d'électricité et son procédé de fabrication Download PDF

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Publication number
WO2011070918A1
WO2011070918A1 PCT/JP2010/071074 JP2010071074W WO2011070918A1 WO 2011070918 A1 WO2011070918 A1 WO 2011070918A1 JP 2010071074 W JP2010071074 W JP 2010071074W WO 2011070918 A1 WO2011070918 A1 WO 2011070918A1
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Prior art keywords
negative electrode
positive electrode
current collector
storage device
overlapping region
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PCT/JP2010/071074
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English (en)
Japanese (ja)
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真治 山本
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株式会社 村田製作所
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Publication of WO2011070918A1 publication Critical patent/WO2011070918A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
    • H01M50/124—Primary casings; Jackets or wrappings characterised by the material having a layered structure
    • H01M50/1243—Primary casings; Jackets or wrappings characterised by the material having a layered structure characterised by the internal coating on the casing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/586—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries inside the batteries, e.g. incorrect connections of electrodes
    • 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
    • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
    • H01M50/117—Inorganic material
    • H01M50/119—Metals
    • 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
    • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
    • H01M50/121—Organic material
    • 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
    • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
    • H01M50/124—Primary casings; Jackets or wrappings characterised by the material having a layered structure
    • H01M50/126—Primary casings; Jackets or wrappings characterised by the material having a layered structure comprising three or more layers
    • H01M50/129—Primary casings; Jackets or wrappings characterised by the material having a layered structure comprising three or more layers with two or more layers of only organic material
    • 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
    • H01M50/131—Primary casings; Jackets or wrappings characterised by physical properties, e.g. gas permeability, size or heat resistance
    • H01M50/133—Thickness
    • 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
    • H01M50/131—Primary casings; Jackets or wrappings characterised by physical properties, e.g. gas permeability, size or heat resistance
    • H01M50/136—Flexibility or foldability
    • 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
    • H01M50/172—Arrangements of electric connectors penetrating the casing
    • H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
    • H01M50/178—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for pouch or flexible bag cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/54—Connection of several leads or tabs of plate-like electrode stacks, e.g. electrode pole straps or bridges
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/547—Terminals characterised by the disposition of the terminals on the cells
    • H01M50/548—Terminals characterised by the disposition of the terminals on the cells on opposite sides of the cell
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/552—Terminals characterised by their shape
    • H01M50/553—Terminals adapted for prismatic, pouch or rectangular cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/564—Terminals characterised by their manufacturing process
    • H01M50/566—Terminals characterised by their manufacturing process by welding, soldering or brazing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/574—Devices or arrangements for the interruption of current
    • H01M50/578—Devices or arrangements for the interruption of current in response to pressure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
    • H01M50/593—Spacers; Insulating plates
    • 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

Definitions

  • the present invention generally relates to an electricity storage device and a method for manufacturing the same, and specifically, a lithium ion secondary battery, a lithium secondary battery, a polymer secondary battery, an organic radical battery, an all-solid battery, an electric double layer capacitor, and the like.
  • the electrical storage element which accommodates this electrical storage element using the outer packaging member which has flexibility, and its manufacturing method are related.
  • a lithium ion secondary battery containing a storage element using a flexible laminate film (also referred to as a laminated sheet) is used.
  • the laminate film is positioned on the inner surface side facing the power storage element, and is positioned on the outer surface of the synthetic resin, the outer surface of the lithium ion secondary battery, the outer surface layer of the synthetic resin, and the inner surface layer and the outer surface layer. It consists of an intermediate layer placed between them.
  • the inner surface layer is made of, for example, a thermoplastic resin excellent in electrolytic solution resistance and heat sealability, such as polyethylene and polypropylene.
  • middle layer consists of a metal layer excellent in flexibility and intensity
  • the outer surface layer is made of, for example, an insulating resin excellent in electrical insulation, such as nylon or polyamide.
  • the power storage element is formed by winding or alternately stacking a positive electrode plate and a negative electrode plate via a separator.
  • Patent Document 1 in Japanese Unexamined Patent Publication No. 2000-58011 (hereinafter referred to as Patent Document 1), an external terminal foil (positive electrode or negative electrode connection terminal) and a current collector It has been proposed that the terminal connection portion is covered with a thermosetting resin to suppress a short circuit between the connection portion and the outer packaging member and deterioration of the sealing reliability of the outer case (outer packaging member).
  • Patent Document 2 Japanese Patent No. 4065915 (hereinafter referred to as Patent Document 2), in a lithium secondary battery, a welded portion of a grid (electrode current collector) and a tab member (positive electrode or negative electrode connection terminal) is covered with an insulating tape. Therefore, it has been proposed to prevent a short circuit caused by damage to the packaging material (outer packaging member) due to the welded portion or the tab member.
  • Patent Document 3 Japanese Patent Application Laid-Open No. 2005-149938 (hereinafter referred to as Patent Document 3), without removing the burrs at the ends of the positive electrode tab (positive electrode connection terminal) and the negative electrode tab (negative electrode connection terminal) in the film-covered battery, In order to prevent defects due to burrs, protective tape is applied to the joints between the positive and negative current collectors and the positive and negative tabs to cover the positive and negative tabs Has been proposed.
  • Patent Document 4 in a flat battery, a current collector and positive electrode lead (positive electrode connection terminal) of a positive electrode plate, and a current collector and negative electrode lead (negative electrode connection) of a negative electrode plate. A terminal), and an electrode group in which the positive electrode plate and the negative electrode plate are insulated via a separator by covering the connection portion with an adhesive resin insoluble in the electrolyte, and an outer case (outer packaging member) It has been proposed to integrate.
  • Patent Document 4 the space surrounded by the seal part of the outer case and the end face of the electrode group facing the seal part is filled with an adhesive resin that is insoluble in the electrolytic solution, and each lead is used as an adhesive resin. It has been proposed to coat them.
  • Patent Documents 1 to 4 have the following problems. That is, since an insulating layer is formed at the ends of the positive electrode current collector and the negative electrode current collector before injecting the electrolytic solution in the manufacturing process, the electrolytic solution is used with the ends of the current collector sealed with the insulating layer. Will be injected. Then, the electrolyte solution cannot be impregnated from the end side of the current collector toward the center portion of the electrode laminate, and the impregnation time of the electrolyte solution deteriorates or the impregnation time becomes insufficient. There is a problem of becoming longer.
  • an object of the present invention is to provide a power storage device using a flexible outer packaging member, which can prevent a short circuit due to damage of the outer packaging member, and can improve productivity by improving the impregnation property of the electrolytic solution. It is to provide a device and its manufacturing method.
  • An electricity storage device includes an electrode laminate formed by alternately laminating a plurality of positive plates and a plurality of negative plates with a separator interposed therebetween, an inner surface layer made of at least a thermoplastic resin, and an outer side thereof And a flexible outer packaging member that accommodates the electrode stack, and ends of the positive electrode current collectors of the plurality of positive electrode plates and the negative electrode current collectors of the plurality of negative electrode plates, respectively. And a positive electrode connection terminal and a negative electrode connection terminal led out from the outer peripheral edge of the outer packaging member. An overlapping region where each end of the positive electrode current collector and the negative electrode current collector overlaps with each of the positive electrode connecting terminal and the negative electrode connecting terminal and a non-overlapping region where they do not overlap are formed.
  • the overlapping region includes a connection portion between each end of the positive electrode current collector and the negative electrode current collector and each of the positive electrode connection terminal and the negative electrode connection terminal.
  • a coating layer is formed on the inner surface layer of the outer packaging member so as to cover at least one of the overlapping region and the non-overlapping region.
  • the coating layer is formed on the inner surface layer of the outer packaging member so as to cover at least one of the overlapping region and the non-overlapping region, at least the positive electrode current collector and the negative electrode current collector A covering layer is formed so as to cover each end of the body. For this reason, it is possible to prevent the covering member from damaging the outer packaging member when the end portion of the current collector or the connection portion between the end portion of the current collector and the positive electrode or the negative electrode connecting terminal contacts the outer packaging member. it can. Thereby, it can prevent that each edge part of a positive electrode collector and a negative electrode collector and the metal layer of an outer packaging member short-circuit (prevention function).
  • the coating layer can be easily formed in advance on the inner surface layer of the outer packaging member. Therefore, the coating layer having the above-described prevention function can be formed without reducing productivity.
  • the coating layer is formed in advance on the inner surface layer of the outer packaging member, and then the electrode laminate is accommodated in the outer packaging member.
  • the electrolyte can be injected from the opening of the outer packaging member. For this reason, when the electrolytic solution is injected, since the coating layer is not disposed so as to seal the end of the current collector, the electrolytic solution can be sufficiently impregnated into the electrode laminate. Therefore, the coating layer having the above-described prevention function can be formed without reducing the impregnation property of the electrolytic solution into the electrode laminate.
  • a coating layer is formed on the inner surface layer of the outer packaging member so as to cover the overlapping region and the non-overlapping region, that is, to cover the entire end of the current collector.
  • the connecting portion is formed by ultrasonic welding.
  • the coating layer preferably contains a tape material.
  • the coating layer is preferably formed by applying a thermoplastic resin.
  • the covering layer may be any of an insulating layer, a conductive layer, and a conductive resin layer as long as the above-described prevention function is achieved.
  • a coating layer can be formed by intermittently applying a thermoplastic resin so as to cover only the resin. Moreover, if the coating layer is remelted at the temperature at which the outer packaging member is thermally welded, the outer packaging member and the electrode laminate can be integrated.
  • the electrode laminate is formed by alternately laminating a plurality of positive plates and a plurality of negative plates with a ninety-fold folded long separator interposed therebetween. Preferably it is.
  • the separator can be handled as a strip-shaped continuous body, so that it is possible to prevent positional deviation between the electrode plate and the separator when the electrode stack is stacked.
  • the bent portion of the separator covers one of the electrode plates, so that the electrolyte impregnation performance is reduced when the electrolyte is injected in the manufacturing process.
  • the coating layer is not disposed so as to seal the end portion of the current collector, the electrode laminate can be impregnated with the electrolyte from the end side. Therefore, the coating layer having the above-described prevention function can be formed without reducing the impregnation property of the electrolytic solution into the electrode laminate.
  • the method for manufacturing an electricity storage device according to the present invention is applied to an electricity storage device having the following preconditions.
  • the electricity storage device is disposed on an outer side of an electrode laminate formed by alternately laminating a plurality of positive plates and a plurality of negative plates with a separator interposed therebetween, at least an inner layer made of a thermoplastic resin.
  • a flexible outer packaging member that accommodates the electrode laminate, and electrically connected to each end of the positive electrode current collector of the plurality of positive electrode plates and the negative electrode current collector of the plurality of negative electrode plates.
  • a positive connection terminal and a negative connection terminal led out from the outer peripheral edge of the outer packaging member are provided.
  • An overlapping region where each end of the positive electrode current collector and the negative electrode current collector overlaps with each of the positive electrode connecting terminal and the negative electrode connecting terminal and a non-overlapping region where they do not overlap are formed.
  • the overlapping region includes a connection portion between each end of the positive electrode current collector and the negative electrode current collector and each of the positive electrode connection terminal and the negative electrode connection terminal.
  • a coating layer is formed in advance on the inner surface layer of the outer packaging member so as to cover at least one of the overlapping region and the non-overlapping region. To do.
  • the coating layer can be easily formed on the inner surface layer of the outer packaging member in advance. Therefore, the coating layer having the above-described prevention function can be formed without reducing productivity.
  • an insulating layer is formed in advance on the inner surface layer of the outer packaging member, and then the electrode stack is accommodated in the outer packaging member.
  • the electrolyte can be injected from the opening of the outer packaging member. For this reason, when the electrolytic solution is injected, since the coating layer is not disposed so as to seal the end of the current collector, the electrolytic solution can be sufficiently impregnated into the electrode laminate. Therefore, the coating layer having the above-described prevention function can be formed without reducing the impregnation property of the electrolytic solution into the electrode laminate.
  • a covering layer may be formed in advance on the inner surface layer of the outer packaging member so as to cover the overlapping region and the non-overlapping region, that is, to cover the entire end of the current collector. preferable.
  • the connecting portion is formed by ultrasonic welding.
  • the coating layer preferably contains a tape material.
  • the coating layer is preferably formed by applying a thermoplastic resin.
  • a coating layer can be formed by intermittently applying a thermoplastic resin so as to cover only the resin. Moreover, if the coating layer is remelted at the temperature at which the outer packaging member is thermally welded, the outer packaging member and the electrode laminate can be integrated.
  • the electrode laminate is formed by alternately laminating a plurality of positive plates and a plurality of negative plates with a ninety-fold long separator interposed therebetween. Preferably it is formed.
  • the separator can be handled as a strip-shaped continuous body, so that it is possible to prevent positional deviation between the electrode plate and the separator when the electrode stack is stacked.
  • the bent portion of the separator covers one of the electrode plates, so that the electrolyte impregnation performance is reduced when the electrolyte is injected in the manufacturing process.
  • the coating layer is not disposed so as to seal the end portion of the current collector, the electrode laminate can be impregnated with the electrolyte from the end side. Therefore, the insulating layer having the above-described prevention function can be formed without reducing the impregnation property of the electrolytic solution into the electrode laminate.
  • an electricity storage device using a flexible outer packaging member it is possible to prevent a short circuit due to damage of the outer packaging member and to improve productivity by improving the impregnation property of the electrolytic solution.
  • FIG. 1 is a schematic plan view showing an example of a laminated lithium ion secondary battery that is an embodiment of an electricity storage device of the present invention.
  • FIG. 2 is a partial cross-sectional view showing, in an enlarged manner, a cross section viewed from a direction along line II-II in FIG. 1 in a laminated lithium ion secondary battery before sealing.
  • FIG. 3 is a partial cross-sectional view showing, in an enlarged manner, a cross section viewed from a direction along line III-III in FIG. 1 in a laminated lithium ion secondary battery before sealing.
  • FIG. 1 is a schematic plan view showing an example of a laminated lithium ion secondary battery that is an embodiment of an electricity storage device of the present invention.
  • FIG. 2 is a partial cross-sectional view showing, in an enlarged manner, a cross section viewed from a direction along line II-II in FIG. 1 in a laminated lithium ion secondary battery before sealing.
  • FIG. 3 is a partial cross-
  • FIG. 4 is a partial cross-sectional view showing, in an enlarged manner, a cross section viewed from a direction along the line IV-IV in FIG. 1 as one embodiment of the electrode laminate in the laminated lithium ion secondary battery of the present invention.
  • FIG. 2 is a partial cross-sectional view showing, in an enlarged manner, a cross section viewed from a direction along line II-II in FIG. 1 in a laminated lithium ion secondary battery after sealing.
  • FIG. 3 is a plan view schematically showing a positional relationship between a negative electrode connection terminal and a current collector in a laminated lithium ion secondary battery as one embodiment of the present invention.
  • a laminate-type lithium ion secondary battery 100 includes an electrode laminate 10 and two upper and lower flexible outer packaging members that have a rectangular shape and accommodate and seal the electrode laminate 10. 20, and a positive electrode connection terminal 30 and a negative electrode connection terminal 40 which are electrically connected to the electrode laminate 10 and led out from the outer peripheral edge of the outer packaging member 20 in a direction facing each other.
  • the sealing part 21 is formed in the outer periphery part of the four directions of the outer packaging member 20 by heat welding (heat sealing).
  • the electrode laminate 10 includes a plurality of positive plates 11, a plurality of negative plates 12, and a separator 13 disposed so as to be interposed between the positive plates 11 and the negative plates 12. And a non-aqueous electrolyte (not shown).
  • the plurality of positive electrode plates 11 and the plurality of negative electrode plates 12 have a strip shape, the separator 13 has a long shape, and the separator 13 is formed into a ninety-nine fold (zigzag shape). 12 are alternately laminated. Further, the outermost periphery of the separator 13 is circulated so as to surround the electrode stack 10. Note that the number of rounds of the outer periphery of the separator 13 is not particularly limited.
  • the negative electrode plate 12 includes a negative electrode current collector 121, and is connected to the negative electrode connection terminal 40 through an end portion where the plurality of negative electrode current collectors 121 of the plurality of negative electrode plates 12 are integrated.
  • the positive electrode plate 11 includes a positive electrode current collector, and is connected to the positive electrode connection terminal 30 (FIG. 1) via an end portion where a plurality of positive electrode current collectors of the plurality of positive electrode plates 11 are integrated. It is connected.
  • the outer packaging member 20 is positioned on the inner surface side facing the electrode laminate 10, and is positioned on the outer surface of the laminated lithium ion secondary battery 100, the inner surface layer made of synthetic resin, It is formed of a single film composed of a metal layer disposed between a layer and an outer surface layer, that is, a laminate film having a three-layer structure (the three-layer structure is omitted in FIGS. 2 and 3).
  • the inner surface layer is made of polypropylene which is a heat-sealable thermoplastic resin and has a thickness of 30 to 120 ⁇ m.
  • the metal layer is made of an aluminum foil or an aluminum alloy foil and has a thickness of 30 to 50 ⁇ m.
  • the outer surface layer is made of nylon (registered trademark) and has a thickness of 20 to 40 ⁇ m.
  • the outer packaging member 20 configured in this manner is a material that is easily deformed and has flexibility.
  • the laminate film should just have an inner surface layer and the metal layer arrange
  • the outer peripheral edge portions of two laminate films are overlapped and heat-welded so that the sealing portion 21 is formed on the outer peripheral edge portions of the four sides.
  • the overlapping region P includes connection portions 121a and non-connection portions 121b between the end portions of the plurality of negative electrode current collectors 121 and the negative electrode connection terminals 40.
  • the connection part 121a is formed by, for example, ultrasonic welding, and is arranged at a plurality of places with the non-connection part 121b interposed therebetween (in FIG. 3, three connection parts 121a and four non-connection parts 121b).
  • the connecting portion 121a may be formed by resistance welding or laser welding.
  • the surface of the inner surface layer of the outer packet member 20 is opposed to at least one of the overlapping region P and the non-overlapping region Q.
  • the covering layer 50 is formed in advance.
  • the covering layer 50 is disposed so as to face the overlapping region P and the non-overlapping region Q, that is, to face the entire end portion R of the negative electrode current collector 121. It is formed in a band shape.
  • the coating layer 50 when forming the coating layer 50 only in the overlapping region P, it is formed intermittently so as not to face the non-overlapping region Q.
  • the coating layer 50 is formed so as to cover the end of the negative electrode current collector 121 on the negative electrode connection terminal 40, but the portion led to the negative electrode connection terminal 40 of the negative electrode current collector 121 (FIG. 2 of the curved negative electrode current collector 121) may be formed.
  • an insulating tape is used in which a silicon-based, acrylic-based, or urethane-based adhesive is adhered to both sides of a base material made of a thermoplastic resin such as polypropylene or polyimide. It is affixed on the surface of the inner surface layer of the outer packaging member 20.
  • the manufacturing process a step of injecting an electrolyte into the outer packaging member 20 in which the electrode laminate 10 is accommodated and a step of vacuum sealing (vacuum sealing) the outer packaging member 20 will be described.
  • the three sides one of the two sides from which the positive electrode connection terminal 30 and the negative electrode connection terminal 40 are led out and the two sides from which the connection terminal is not led out
  • the electrolytic solution is injected into the outer packet member 20 through an opening formed in the other of the outer peripheral edge portions that are not sealed (the other of the two sides from which the connection terminals are not led out).
  • the sides forming the opening may be any of the four sides.
  • the coating layer 50 is disposed on the inner surface layer of the outer packaging member 20 before sealing, and is not disposed so as to seal the ends of both current collectors.
  • the laminate 10 can be sufficiently impregnated.
  • the outer periphery of the outer packaging member 20 is sealed by thermal welding by vacuum-sealing the sides forming the opening.
  • the covering layer 50 formed on the inner surface layer of the outer packaging member 20 is in close contact with the negative electrode current collector 121 so as to cover the entire end of the negative electrode current collector 121. It is formed. In this way, the electrode laminate 10 is vacuum-sealed in the outer packaging member 20 as shown in FIG.
  • the inner layer of the outer packaging member 20 has a coating layer so as to cover at least one of the overlapping region P and the non-overlapping region Q. 50 is formed, the covering layer 50 is formed so as to cover at least the respective ends of the positive electrode current collector and the negative electrode current collector 121.
  • the outer packaging member 20 is damaged when the end portion of the current collector or the connecting portion 121a between the current collector end portion and the positive electrode connection terminal 30 or the negative electrode connection terminal 40 contacts the outer packaging member 20. This can be prevented by the covering layer 50. Thereby, it can prevent that each edge part of the positive electrode collector and the negative electrode collector 121 and the metal layer of the outer packaging member 20 short-circuit (prevention function).
  • the coating layer 50 can be easily formed in advance on the inner surface layer of the outer packaging member 20. Therefore, the coating layer 50 having the above prevention function can be formed without reducing productivity.
  • the coating layer 50 is formed in advance on the inner surface layer of the outer packaging member 20, and then the electrode stack 10 is formed.
  • the electrolytic solution can be injected from the opening of the outer packaging member 20 by being housed in the outer packaging member 20. For this reason, when the electrolytic solution is injected, since the coating layer 50 is not disposed so as to seal the end portion of the current collector, the electrode laminate 10 can be sufficiently impregnated with the electrolytic solution. Therefore, the coating layer 50 having the above-described prevention function can be formed without reducing the impregnation property of the electrolytic solution into the electrode laminate 10.
  • the inner surface layer of the outer packaging member 20 covers the overlapping region P and the non-overlapping region Q, that is, the entire end portion of the current collector.
  • a covering layer 50 is formed so as to cover R.
  • the connecting portion 121a is formed by ultrasonic welding, burrs or the like generated by ultrasonic welding are in contact with the outer packaging member 20.
  • the outer cover member 20 can be prevented from being damaged by the covering layer 50. Thereby, it can prevent that the burr
  • the covering layer 50 includes the tape material, so that the covering layer 50 specifically disposed on the inner surface layer of the outer packaging member 20 can be easily formed. Can be formed (pasted). Therefore, the coating layer 50 having the above prevention function can be formed without reducing productivity.
  • the coating layer 50 is configured to include a tape material, but the coating layer 50 is formed by applying a thermoplastic resin. You may do it. By being configured in this manner, the overlapping is further performed so as to cover only the overlapping region P where the respective ends of the positive electrode current collector and the negative electrode current collector 121 overlap with each of the positive electrode connection terminal 30 and the negative electrode connection terminal 40.
  • the coating layer 50 can be formed by intermittently applying a thermoplastic resin so as to cover only the connection portion 121a in the region P. Moreover, if the coating layer 50 is remelted at the temperature at which the outer packaging member 20 is thermally welded, the outer packaging member 20 and the electrode laminate 10 can be integrated.
  • the covering layer 50 may be any of an insulating layer, a conductive layer, and a conductive resin as long as it performs the above-described prevention function.
  • the electrode laminate 10 includes a plurality of positive electrode plates 11 with the long separator 13 folded in ninety-nine folds. It is formed by alternately laminating a plurality of negative electrode plates 12.
  • the separator 13 can be handled as a belt-like continuous body, so that it is possible to prevent positional deviation between the electrode plate and the separator 13 when the electrode laminate 10 is stacked.
  • the bent portion of the separator 13 covers one of the electrode plates, so that the electrolyte solution is impregnated when the electrolyte solution is injected in the manufacturing process.
  • the coating layer 50 is not disposed so as to seal the end portion of the current collector, the electrode laminate 10 is impregnated with the electrolyte from the end side. Can do. Therefore, the coating layer 50 having the above-described prevention function can be formed without reducing the impregnation property of the electrolytic solution into the electrode laminate 10.
  • the negative electrode connection terminal 40 is connected by ultrasonic welding on the lower surface of the portion where the ends of the current collector are integrated, but the negative electrode connection terminal 40 may be connected by ultrasonic welding on the upper surface of the location where the current collector is integrated, or arranged so as to be inserted into the location where the current collector is integrated, and by ultrasonic welding. They may be connected (the same applies to the positive electrode side).
  • one separator 13 is interposed between the positive electrode plate 11 and the negative electrode plate 12 as a configuration of the electrode laminate 10. May be interposed.
  • the material of the plurality of separators may be the same or different.
  • a strip-shaped separator may be interposed between the positive electrode plate and the negative electrode plate.
  • polyolefin resins such as polypropylene and polyethylene, or a combination thereof, those obtained by adding ceramics such as silica and alumina to polyolefin resins, polyethylene terephthalate, cellulose, nonwoven fabric, and the like are used.
  • the positive electrode plate 11 is configured by forming a positive electrode mixture layer containing a positive electrode active material on both surfaces of the positive electrode current collector, except for an end portion on the side connected to the positive electrode connection terminal 30.
  • the negative electrode plate 12 is configured by forming a negative electrode mixture layer containing a negative electrode active material on both surfaces of the negative electrode current collector, except for an end portion on the side connected to the negative electrode connection terminal 40.
  • the positive electrode plate 11 has a positive electrode slurry obtained by kneading a positive electrode active material, a binder, and optionally a conductive additive in an organic solvent, on both surfaces of a positive electrode current collector made of aluminum foil. It is produced by applying to the substrate and drying to form a positive electrode mixture layer on both surfaces of the positive electrode current collector.
  • the positive electrode active material a metal oxide, a metal sulfide, or a specific polymer can be used depending on the type of the target battery.
  • a metal sulfide or oxide such as TiS 2 , MoS 2 , NbSe 2 , or V 2 O 5 can be used as the positive electrode active material.
  • LiM x O 2 in the chemical formula, M represents one or more transition metals, x varies depending on the charge / discharge state of the battery, and is usually 0.05 or more and 1.10 or less as a positive electrode active material of the lithium ion secondary battery.
  • Lithium composite oxide mainly composed of As the transition metal M constituting this lithium composite oxide, Co, Ni, Mn and the like are preferable.
  • These lithium composite oxides can generate a high voltage and become a positive electrode active material having an excellent energy density.
  • a plurality of these positive electrode active materials may be used in combination.
  • the well-known binder currently normally used for the positive electrode compound material of a lithium ion secondary battery can be used, and said positive electrode compound material is used.
  • the negative electrode plate 12 is made of a negative electrode slurry formed by kneading a negative electrode active material, a binder, and optionally a conductive additive in an organic solvent, on both sides of a negative electrode current collector made of copper foil or aluminum foil. It is produced by coating uniformly on the top and drying to form a negative electrode mixture layer on both sides of the negative electrode current collector.
  • a carbon material such as a non-graphitizable carbon material or a graphite material can be used as the negative electrode active material.
  • carbon materials such as pyrolytic carbons, cokes, graphites, glassy carbon fibers, organic polymer compound fired bodies, carbon fibers, and activated carbon can be used.
  • the cokes include pitch coke, needle coke, and petroleum coke.
  • said organic polymer compound fired body means what carbonized by baking a phenol resin, furan resin, etc. at a suitable temperature.
  • materials that can be doped and dedoped with lithium include polymers such as polyacetylene and polypyrrole, Sn oxides such as SnO 2 , Sn alloys such as Sn 5 Cu 6 , and SiMg 2.
  • Si alloy system such as Li 4 Ti 5 O 12 (lithium titanate) can also be used.
  • the well-known binder currently normally used for the negative electrode compound material of a lithium ion secondary battery can be used, and said negative electrode compound material is used.
  • the nonaqueous electrolytic solution is prepared by dissolving an electrolyte in a nonaqueous solvent.
  • the electrolyte for example, a solution obtained by dissolving LiPF 6 at a concentration of 1.0 mol / L in a non-aqueous solvent is used.
  • an electrolyte other than LiPF 6 lithium salts such as LiBF 4 , LiAsF 6 , LiClO 4 , LiCF 3 SO 3 , LiN (SO 2 CF 3 ) 2 , LiC (SO 2 CF 3 ) 3 , LiAlCl 4 , LiSiF 6 are used. Can be mentioned.
  • LiPF 6 or LiBF 4 is particularly used as the electrolyte.
  • Such an electrolyte is preferably used by being dissolved in a non-aqueous solvent at a concentration of 0.1 mol / L to 3.0 mol / L, and is preferably dissolved at a concentration of 0.5 mol / L to 2.0 mol / L. More preferably, it is used.
  • the non-aqueous solvent for example, a mixture of propylene carbonate, ethylene carbonate and diethyl carbonate in a volume ratio of 5 to 20:20 to 30:60 to 70 is used.
  • non-aqueous solvents include: cyclic carbonates such as propylene carbonate and ethylene carbonate; chain carbonates such as diethyl carbonate and dimethyl carbonate; carboxylic acid esters such as methyl propionate and methyl butyrate; ⁇ -butyllactone, sulfolane, Ethers such as 2-methyltetrahydrofuran and dimethoxyethane can be used.
  • cyclic carbonates such as propylene carbonate and ethylene carbonate
  • chain carbonates such as diethyl carbonate and dimethyl carbonate
  • carboxylic acid esters such as methyl propionate and methyl butyrate
  • ⁇ -butyllactone sulfolane
  • Ethers such as 2-methyltetrahydrofuran and dimethoxyethane can be used.
  • carbonate ester it is preferable from the point of oxidation stability to use carbonate ester as a non-aqueous solvent.
  • the present invention is applied to the lithium ion secondary battery 100 as an example of an electricity storage device.
  • an electricity storage device using a flexible outer packaging member to accommodate at least the electrode stack If so, the present invention can be applied.
  • the present invention can be applied to a lithium secondary battery, a polymer secondary battery, an electric double layer capacitor, and the like.
  • the electricity storage device of the present invention in an electricity storage device that houses an electricity storage element using a flexible outer packaging member, prevents a short circuit due to damage to the outer packaging member, and improves productivity by improving the impregnation property of the electrolytic solution. Therefore, an electricity storage device in which a flexible outer packaging member can be used, for example, a lithium secondary battery, a polymer secondary battery, an organic radical battery, an all solid state battery in addition to a lithium ion secondary battery as an electricity storage element This contributes to improving the productivity of an electricity storage device that accommodates various electricity storage elements such as electric double layer capacitors.
  • SYMBOLS 10 Electrode laminated body, 11: Positive electrode plate, 12: Negative electrode plate, 13: Separator, 20: Outer packaging member, 50: Coating layer, 100: Laminate type lithium ion secondary battery, 121: Negative electrode collector, 121a: Connection Part, 121b: non-connection part, P: overlapping area, Q: non-overlapping area.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Inorganic Chemistry (AREA)
  • Secondary Cells (AREA)

Abstract

L'invention concerne un dispositif de stockage d'électricité utilisant un élément de conditionnement extérieur souple permettant d'éliminer un court-circuit dû à une rupture de l'élément de conditionnement extérieur, et améliorant la conductivité grâce à une amélioration de l'imprégnation d'une solution électrolytique. L'invention concerne également un procédé pour fabriquer le dispositif de stockage d'électricité. On forme dans le dispositif de stockage d'électricité des régions de chevauchement (P) dans lesquelles la partie d'extrémité d'un collecteur à électrode positive et celle d'un collecteur à électrode négative (121) sont respectivement superposées à une borne de connexion à électrode positive (30) et à une borne de connexion à électrode négative (40), et une région (Q) sans chevauchement dans laquelle les parties d'extrémité et les bornes ne se chevauchent pas. Les régions de chevauchement (P) comprennent des sections de connexion (121a) dans lesquelles les parties d'extrémité du collecteur à électrode positive et du collecteur à électrode négative (121) respectifs sont respectivement connectées à la borne de connexion à électrode positive (30) et à la borne de connexion à électrode négative (40). Sur la couche superficielle intérieure de l'élément de conditionnement extérieur (20), une couche de revêtement (50) est formée de telle manière que la couche de revêtement recouvre les régions de chevauchement (P) et/ou la région de non-chevauchement (Q).
PCT/JP2010/071074 2009-12-07 2010-11-26 Dispositif de stockage d'électricité et son procédé de fabrication WO2011070918A1 (fr)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012174438A (ja) * 2011-02-21 2012-09-10 Dainippon Printing Co Ltd 電気化学セル用包装材料およびその製造方法
JP2019179673A (ja) * 2018-03-30 2019-10-17 株式会社エンビジョンＡｅｓｃエナジーデバイス 電気化学デバイスおよびその製造方法
CN112913076A (zh) * 2018-11-21 2021-06-04 深圳市大疆创新科技有限公司 智能电池及其锂电芯
CN113169305A (zh) * 2018-12-18 2021-07-23 日本碍子株式会社 锂二次电池
US11830672B2 (en) 2016-11-23 2023-11-28 KYOCERA AVX Components Corporation Ultracapacitor for use in a solder reflow process

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11120989A (ja) * 1997-10-14 1999-04-30 Dainippon Printing Co Ltd 電池ケースの電極構造
JP2002151159A (ja) * 2000-09-01 2002-05-24 Nisshinbo Ind Inc リチウム系電池
WO2007105541A1 (fr) * 2006-03-13 2007-09-20 Nec Corporation Dispositif electrique avec capot de film exterieur
JP2008243815A (ja) * 2007-03-26 2008-10-09 Enertech Internatl Inc ポーチ型リチウム二次電池
JP2009259739A (ja) * 2008-04-21 2009-11-05 Sumitomo Electric Ind Ltd 電気部品、非水電解質電池、並びに、それらに用いられるリード線及び封入容器

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11120989A (ja) * 1997-10-14 1999-04-30 Dainippon Printing Co Ltd 電池ケースの電極構造
JP2002151159A (ja) * 2000-09-01 2002-05-24 Nisshinbo Ind Inc リチウム系電池
WO2007105541A1 (fr) * 2006-03-13 2007-09-20 Nec Corporation Dispositif electrique avec capot de film exterieur
JP2008243815A (ja) * 2007-03-26 2008-10-09 Enertech Internatl Inc ポーチ型リチウム二次電池
JP2009259739A (ja) * 2008-04-21 2009-11-05 Sumitomo Electric Ind Ltd 電気部品、非水電解質電池、並びに、それらに用いられるリード線及び封入容器

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012174438A (ja) * 2011-02-21 2012-09-10 Dainippon Printing Co Ltd 電気化学セル用包装材料およびその製造方法
US11830672B2 (en) 2016-11-23 2023-11-28 KYOCERA AVX Components Corporation Ultracapacitor for use in a solder reflow process
JP2019179673A (ja) * 2018-03-30 2019-10-17 株式会社エンビジョンＡｅｓｃエナジーデバイス 電気化学デバイスおよびその製造方法
JP7109233B2 (ja) 2018-03-30 2022-07-29 株式会社エンビジョンＡｅｓｃジャパン 電気化学デバイスの製造方法
CN112913076A (zh) * 2018-11-21 2021-06-04 深圳市大疆创新科技有限公司 智能电池及其锂电芯
CN113169305A (zh) * 2018-12-18 2021-07-23 日本碍子株式会社 锂二次电池

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