WO2006095579A1 - Électrode multicouche, dispositif électrique utilisant l’électrode multicouche et méthode pour les fabriquer - Google Patents

Électrode multicouche, dispositif électrique utilisant l’électrode multicouche et méthode pour les fabriquer Download PDF

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Publication number
WO2006095579A1
WO2006095579A1 PCT/JP2006/303387 JP2006303387W WO2006095579A1 WO 2006095579 A1 WO2006095579 A1 WO 2006095579A1 JP 2006303387 W JP2006303387 W JP 2006303387W WO 2006095579 A1 WO2006095579 A1 WO 2006095579A1
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WIPO (PCT)
Prior art keywords
electrode
electrode plate
separator
cut portion
negative electrode
Prior art date
Application number
PCT/JP2006/303387
Other languages
English (en)
Japanese (ja)
Inventor
Kiyokazu Oikawa
Masatomo Mizuta
Original Assignee
Nec Corporation
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 Nec Corporation filed Critical Nec Corporation
Priority to JP2007507041A priority Critical patent/JP5045434B2/ja
Publication of WO2006095579A1 publication Critical patent/WO2006095579A1/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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0413—Large-sized flat cells or batteries for motive or stationary systems with plate-like 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
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/463—Separators, membranes or diaphragms characterised by their shape
    • H01M50/466—U-shaped, bag-shaped or folded
    • 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
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/4235—Safety or regulating additives or arrangements in electrodes, separators or electrolyte
    • 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
    • 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
    • H01M2004/024—Insertable 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
    • H01M50/50—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
    • 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 an electrode laminate used for a chemical battery element, a capacitor element, and the like, an electric device typified by a battery and a capacitor using the electrode laminate, and a method for producing them.
  • an electrode laminate in which a plurality of positive plates and a plurality of negative plates are alternately stacked via separators is hermetically sealed with an electrolyte and an exterior material such as metal or film.
  • the configuration is simply referred to as “sealing”.
  • a positive electrode plate and a negative electrode plate (hereinafter simply referred to as an electrode plate when the positive electrode and the negative electrode are not distinguished from each other) are configured by applying an electrode material on both surfaces of a metal foil. From the electrode plate, a metal foil portion to which no electrode material is applied extends to connect to the lead portion for external lead-out.
  • the separator has a bag shape.
  • the electrode plate is accommodated in a state where the non-coated portion of the electrode material is extended, and the positive electrode plate and the negative electrode plate are alternately laminated.
  • Patent Document 1 JP-A-8-96829
  • Patent Document 2 JP-A-8-96829
  • a separator is formed into a bag shape by heat-sealing at a position including its four corners and being axially symmetric with respect to the center line of the electrode plate. Therefore, it is disclosed that wrinkle generation on the separator is prevented.
  • Patent Document 3 JP 2002-324571 (hereinafter referred to as Patent Document 3), the entire circumference of the separator is heat-sealed along the four sides of the electrode plate to prevent foreign matter from entering the bag-like separator. In addition to preventing, scattering of the electrode material is prevented.
  • the separator is reliably positioned between the negative electrode plate and the positive electrode plate so as not to cause a short circuit between the positive electrode plate and the negative electrode plate.
  • forming the separator in a bag shape and accommodating the electrode plate therein is effective in preventing the displacement of the electrode plate.
  • those described in Patent Documents 1 and 2 can regulate the position of the electrode plate in the separator by heat-sealing the four corners of the separator.
  • the electrode plate When the position of the electrode plate is regulated by heat-sealing the four corners of the separator, the electrode plate must project the non-coated portion of the electrode material, so at least the electrode It is necessary to form the non-coated part of the material narrower than the part where the electrode material is applied. However, when the non-coated portion of the electrode material is formed narrow, the current path is narrowed, leading to an increase in battery resistance. In view of such battery resistance and the ease of manufacturing the electrode plate, the electrode plate is preferably a simple rectangle including the non-coated portion of the electrode material. However, with a simple rectangular electrode plate, it is not possible to create a catching force as when the non-coated portion of the electrode material is made narrow. For this reason, when the non-coated part protrudes from the separator, the electrode plate can easily be removed in the protruding direction.
  • the relative positional relationship between the electrode plates that is, the positive electrode plate and the negative electrode plate, which is not only the positional relationship between the separator and the electrode plate, is also important. If the relative positions of the positive and negative plates shift, they are applied to the respective electrode plates! The facing area between the electrode materials varies. This causes variations in charge / discharge characteristics of the electrode laminate as a battery.
  • the main object of the present invention is to make it possible to manufacture an electrode laminate more easily while preventing the positional deviation between the separator and the electrode plate, and as a result, between the positive electrode plate and the negative electrode plate. It is to obtain an electrical device that is highly reliable without any shortage.
  • the second object of the present invention is to easily perform relative positioning of the positive electrode plate and the negative electrode plate, and as a result, to obtain an electrode laminate and an electric device having stable characteristics. It is.
  • the electrode laminate of the present invention comprises a plurality of positive electrode plates and a plurality of positive electrode plates.
  • the electrode plate for the negative electrode and the force separator are stacked on each other.
  • the electrode plate is partitioned into a rectangular region where the electrode material is applied on both sides and a region extending from one side of the region where the electrode material is not applied, and is substantially rectangular.
  • the separator is disposed on both sides of the electrode plate by extending the side of the electrode plate where the electrode material is not applied and at least one of the positive electrode plate and the negative electrode plate in between. Yes, when at least one side is heat-sealed continuously or intermittently to accommodate the electrode plate, folded into two to accommodate the electrode plate, and two sheet-like separators There is.
  • the electrode plate disposed between the separators has a cut portion formed at a portion at least partially covered by the separator, and regions facing each other through the cut portion of the separator are heat-sealed! .
  • the cut portion is formed on the electrode plate, and the separator is disposed opposite to the electrode plate on which the cut portion is formed. Then, the separator plates disposed opposite to each other with the electrode plate interposed therebetween are thermally fused to each other in a region facing each other through the cut portion of the electrode plate, whereby the electrode plate on which the cut portion is formed and the separator are positioned relative to each other. And the positional deviation between the electrode plate on which the cut portion is formed and the separator is suppressed.
  • the opposing region of the separator is preferably heat-sealed inside the cut portion, which is preferably concave, so that the electrode material is applied! The separator electrode plate is prevented from coming off in both directions. Thus, the positional deviation between the separator and the electrode plate in all directions is restricted with a small number of heat-sealing portions.
  • the other electrode plate When the cut portion is formed on only one of the positive electrode plate and the negative electrode plate, the other electrode plate has an edge on the side opposite to the side where one electrode of the separator extends. A second excision may be formed at a position corresponding to. Using this second excision part, the other electrode plate can be positioned with respect to the separator. In particular, if the dimension of the separator in the direction along the side where the separator force of one electrode plate extends is larger than the dimension of the other electrode plate, the positioning plate is used instead of the second cutout portion. Marks may be formed.
  • the electric device of the present invention includes the electrode laminate of the present invention and a positive electrode of the electrode laminate.
  • the electrode material for the electrode plate for the negative electrode and the negative electrode is applied, and the tabs for the positive electrode and the negative electrode are connected to the current collecting portions where the regions are collectively bonded to the positive electrode and the negative electrode, respectively, and the tabs are extended.
  • an exterior material that seals the electrode stack is applied, and the tabs for the positive electrode and the negative electrode are connected to the current collecting portions where the regions are collectively bonded to the positive electrode and the negative electrode, respectively, and the tabs are extended.
  • an exterior material that seals the electrode stack is an exterior material that seals the electrode stack.
  • the electrical device of the present invention has the electrode laminate of the present invention described above, the positional accuracy of each electrode plate and the separator is improved, and an electrical device having stable characteristics is achieved. Is done.
  • the method for producing an electrode laminate of the present invention is divided into a rectangular region in which an electrode material is applied on both sides and a region in which the electrode material extending from one side of this region is not applied. Forming a plurality of positive and negative electrode plates that are rectangular in shape, and forming a cut portion in at least one of the positive and negative electrode plates. Furthermore, in the method for manufacturing an electrode laminate according to the present invention, the electrode plate on which the cut portion is formed is divided into a first portion located on one surface side of the electrode plate and a second portion located on the other surface side.
  • At least one part of the cut portion is covered with the separator that is heat-sealed at least one side continuously or intermittently, or is folded in two, and the electrode plate
  • the electrode material is applied, the step of accommodating the region side by extending the separator side, the step of thermally fusing the regions facing each other through the cut portion of the separator containing the electrode plate, and the separator A step of alternately laminating a positive electrode plate and a negative electrode plate after the heat fusion.
  • each of the electrode plates on which the cut portions are formed is covered with two sheet-like separators, at least part of the cut portions are covered with the separators, and the electrode material of the electrode plates is applied.
  • the step of sandwiching the separator so that the side of the region extends also, the step of heat-sealing the regions facing each other through the cut portion of the separator sandwiching the electrode plate, and after the heat-sealing of the separator, And alternately laminating the electrode plate and the electrode plate for the negative electrode.
  • an electrode laminate of the present invention In the method for producing an electrode laminate of the present invention, a substantially rectangular electrode plate is used, so that no special processing or process is required for the electrode plate. It is not necessary to position the formed electrode plate and separator, and the above-described electrode laminate of the present invention can be easily manufactured.
  • the cut portion may be formed only on one of the positive electrode plate and the negative electrode plate. Good.
  • the second cut portion is formed on the other electrode plate at a position corresponding to the edge on the opposite side to the side on which the one electrode of the separator extends, the second cut portion is used to make a set.
  • the other electrode plate can be easily positioned with respect to the palator.
  • the positioning plate is used instead of the second cutout portion. A mark is formed, and the other electrode can be easily positioned with respect to the separator using the mark.
  • the method for producing an electrical device of the present invention comprises a step of producing an electrode laminate using the above-described method for producing an electrode laminate of the present invention, and electrode plates for positive and negative electrodes of the electrode laminate.
  • the electrode material is applied, and the region is collectively bonded to the positive electrode and the negative electrode.
  • the step of connecting the tab for the positive electrode and the negative electrode to the current collector, respectively, the tab is extended, and the exterior material Sealing the electrode laminate inside.
  • FIG. 1 is an exploded perspective view of a film-clad battery that is an electrical device according to an embodiment of the present invention.
  • FIG. 2 is an exploded perspective view of the electrode laminate shown in FIG.
  • FIG. 3 is an enlarged plan view in the vicinity of a cut portion of the positive electrode plate shown in FIG.
  • FIG. 4 is an enlarged plan view in the vicinity of a cut portion of the negative electrode plate shown in FIG.
  • FIG. 5A is a diagram for explaining an example of a method for producing the positive electrode plate and the negative electrode plate shown in FIG.
  • FIG. 5B is a diagram for explaining an example of a method for producing the positive electrode plate and the negative electrode plate shown in FIG.
  • FIG. 5C is a plan view of the positive electrode plate manufactured through the steps of FIGS. 5A and 5B and accommodated in the separator.
  • FIG. 6 is an enlarged plan view in the vicinity of a cut portion showing another form of the positive electrode plate.
  • FIG. 7 is an enlarged plan view in the vicinity of a cut portion showing still another embodiment of the positive electrode plate.
  • FIG. 8A A positive electrode plate and a separator showing other forms of the separator held by the positive electrode plate
  • FIG. 8B is an exploded perspective view of the positive electrode plate and the separator showing still another embodiment of the separator held by the positive electrode plate.
  • FIG. 9 is an enlarged plan view in the vicinity of a cut portion showing another form of the negative electrode plate.
  • FIG. 10 is an enlarged plan view in the vicinity of a non-coated portion showing another form of the negative electrode plate.
  • a film-clad battery 1 which is an electrical device according to an embodiment of the present invention is shown.
  • the film-clad battery 1 has a plurality of positive plates and a plurality of negative plates separated.
  • Electrode laminate 2 having a structure laminated via a sensor, two exterior films 4 and 5 that seal electrode laminate 2 together with the electrolyte, and the leading end portion extending from exterior films 4 and 5 And a positive electrode tab 3a and a negative electrode tab 3b respectively connected to the positive electrode plate and the negative electrode plate of the electrode laminate 2 in the extended state.
  • the exterior films 4 and 5 have a plane dimension larger than the plane dimension of the electrode laminate 2 so that the electrode laminate 2 can be sandwiched and enclosed from both sides in the thickness direction (laminate direction). Have.
  • the electrode laminate 2 is sealed by heat-sealing the facing surfaces of the exterior films 4 and 5 that overlap each other around the electrode laminate 2.
  • the heat-sealed region of the exterior films 4 and 5 is indicated by hatching as the heat-sealed portion 6.
  • Each exterior film 4, 5 has cup portions 4 a, 5 a in the central region in order to form a space surrounding the electrode laminate 2.
  • the heat-sealing portion 6 is formed over the entire circumference of the cup portions 4a and 5a.
  • the calorie of the cup parts 4a and 5a can be performed by deep drawing.
  • the force that forms the cup portions 4a, 5a on each of the exterior films 4, 5 may be formed only on one of the exterior films, or the exterior film 4 may be formed without forming the cup portion. , 5 may be used to surround the
  • a laminate film can be preferably used.
  • the laminate film a film having flexibility and capable of sealing the electrode laminate 2 by heat fusion so that the electrolyte does not leak can be used.
  • a heat-sealing resin layer made of heat-fusible resin
  • a non-breathable layer made of metal, such as a metal thin film
  • a protective layer that also has film strength, such as polyester or nylon, such as polyethylene terephthalate.
  • the exterior films 4 and 5 may be provided with a protective layer as needed as long as they have at least a heat-sealing resin layer and a non-air-permeable layer.
  • the metal thin film constituting the non-breathable layer for example, a foil of Al, Ti, Ti alloy, Fe, stainless steel, Mg alloy or the like having a thickness of 10 to: LOO / zm can be used.
  • the resin constituting the heat-bonded resin layer include polypropylene, polyethylene, these acid-modified products, polyester such as polyethylene sulfide and polyethylene terephthalate, polyamide, and ethylene vinyl acetate copolymer. Can be used.
  • the thickness of the heat-fusible resin layer is 10 ⁇ m m-200 ⁇ m force is preferred, more preferably 30 ⁇ m-100 ⁇ m.
  • FIG. 2 shows an exploded perspective view of the electrode laminate 2.
  • the electrode laminate 2 has a structure in which a plurality of positive electrode plates 11 and a plurality of negative electrode plates 16 are alternately laminated so that the negative electrode plates 16 are located on the uppermost surface and the lowermost surface.
  • the positive electrode plate 11 is a substantially rectangular member in which a positive electrode active material is applied to both surfaces of a metal foil constituting the positive electrode.
  • the positive electrode active material is applied in a rectangular shape to a region excluding one end of the metal foil, whereby the positive electrode plate 11 has a rectangular positive electrode material application portion 1 la coated with the positive electrode active material, and One side force of the positive electrode material application part 1 la is applied as it is, and is divided into a non-application part l ib.
  • the negative electrode plate 16 is also a substantially rectangular member in which a negative electrode active material is applied to both surfaces of the metal foil constituting the negative electrode.
  • the negative electrode active material is applied in a rectangular shape to a region excluding one end of the metal foil, whereby the negative electrode plate 16 has a rectangular negative electrode material application portion 16a coated with the negative electrode active material and a negative electrode.
  • the material application part 16a is divided into a non-application part 16b which is coated with anything extending as it is.
  • the positive electrode plate 11 and the negative electrode plate 16 are laminated with the non-coated portions l ib and 16b facing away from each other and the non-coated portions l ib and 16b protruding.
  • the non-coated portions l ib and 16b of the positive electrode plate 11 and the negative electrode plate 16 are ultrasonically welded together to form a current collecting portion.
  • the current collector of the positive electrode plate 11 and the current collector of the negative electrode plate 16 are connected to the positive electrode tab 3a and the negative electrode tab 3b, respectively.
  • the positive electrode plate 11, the negative electrode plate 16, and the electrolytic solution are appropriately selected according to the use of the electrode laminate 2, that is, the type of the film-coated battery 1.
  • Various types of chemical batteries such as lithium ion secondary batteries, nickel metal hydride batteries, nickel cadmium batteries, lithium metal primary or secondary batteries, lithium polymer batteries, etc. are not particularly limited. Can be mentioned.
  • the positive electrode plate 11 is made of a positive electrode active material such as lithium 'manganese composite oxide or lithium cobaltate having a thickness of 3 to 50 m.
  • An aluminum foil coated on both sides can be used.
  • the negative electrode plate 16 a carbon material that can be doped / undoped with lithium and coated on both surfaces of a copper foil having a thickness of 3 to 50 m can be used.
  • the electrolyte For example, an electrolytic solution containing a lithium salt can be used.
  • an aluminum foil is used for the positive electrode metal foil
  • an aluminum plate can be used for the positive electrode tab 3a.
  • a copper foil is used for the negative electrode metal foil
  • a nickel plate or a copper plate is used for the negative electrode tab 3b.
  • the negative electrode tab 3b is made of a copper plate, the surface thereof may be nickel-plated. Since these materials are used for general lithium ion secondary batteries, detailed description thereof is omitted.
  • the separator 15 is constructed by intermittently or continuously heat-welding the peripheral three-side force of two sheets stacked on each other along those sides. Accordingly, the separator 15 is formed in a bag shape in which the remaining one side which is not heat-sealed is opened.
  • the positive electrode plate 11 includes a positive electrode material application part 1 la and a part of the non-application part l ib formed in a bag shape so that the side on the non-application part l ib side extends from the separator 15.
  • the positive electrode plate 11 and the negative electrode plate 16 are stacked with the separator 15 interposed therebetween.
  • a member that can be impregnated with an electrolytic solution such as a microporous film (microporous film), a nonwoven fabric, or a woven fabric made of thermoplastic resin such as polyolefin can be used.
  • the non-coated portion l ib of the positive electrode plate 11 has two sides facing each other along the insertion direction of the positive electrode plate 11 into the separator 15, that is, two sides adjacent to the side extending from the separator 15.
  • a concave cut portion 12 is formed by partially cutting away the non-application portion l ib at an intermediate position in the length direction. As shown in FIG. 3, the cut portion 12 is formed at a position completely covered by the separator 15. Then, in a region including the portion covering the cut portion 12, the surfaces facing each other with the cut portion 12 of the bag-like separator 15 sandwiched are heat-sealed to form a heat-welded portion 15a.
  • the positive electrode plate 11 is provided with a cutout portion 12, and in the region including the cutout portion 12, the separator plates 15 facing each other with the positive electrode plate 11 interposed therebetween are heat-sealed, whereby the positive electrode plate 11 is attached to the separator 15. The position of is maintained. Thereby, in the step of laminating the positive electrode plate 11 and the negative electrode plate 16, it is possible to prevent the positional deviation between the positive electrode plate 11 and the separator 15. As a result, it is possible to prevent a short circuit from occurring between the positive electrode plate 11 and the negative electrode plate 16. Further, since the cut portion 12 is formed on the non-applied portion 1 lb, the area of the positive electrode material applied portion 1 la is not any. There is no effect.
  • the cut portion 12 is formed in a concave shape, and the separators 15 facing each other inside the cut portion 12 are heat-sealed to each other, whereby the positive electrode plate 11 and the separator in both directions in the X direction shown in FIG. Misalignment with 15 is prevented.
  • the effect of preventing misalignment in the X direction is the same even if there is only one excision 12, and a configuration that can regulate the degree of freedom of misalignment of the separator 15 so much at one heat-sealed point has been proposed in the past. It has not been.
  • the separator 15 is not open on the side opposite to the side where the excision 12 is provided, that is, it is continuously or intermittently heat-sealed.
  • the positive electrode plate 11 is sandwiched between the heat-sealed portion of the separator 15 and the heat-fused portion in the cut-out portion 12, and misalignment in the Y direction shown in FIG. 2 is also regulated. As a result, misalignment in all directions is regulated.
  • the X direction shown in FIG. 2 is the direction in which the non-application part l ib extends from the positive electrode material application part 1 la of the positive electrode plate 11 in the electrode laminate 2 (non-application from the negative electrode material application part 16a of the negative electrode plate 16).
  • Y direction means a direction perpendicular to the X direction. Note that the sides of the positive electrode plate 11 and the negative electrode plate 16 extending from the separator 15 are parallel to the Y direction.
  • the positive electrode plate 11 is substantially rectangular except for the portion where the cut portion 12 is formed, the positive electrode plate 11 can be easily manufactured using a strip-shaped material.
  • the width of the non-coated portion l ib connected to the positive electrode tab 3a is equal to the width of the positive electrode material coated portion 11a. Since it can be lowered, it can be made into a film battery 1 (see Fig. 1) that can handle large currents.
  • “width” means the Y direction shown in FIG.
  • the cut portion 12 of the positive electrode plate 11 is used to hold the separator 15 as described above. Therefore, the shape of the cut portion 12 is arbitrary as long as the opposing surfaces of the separators 15 arranged to face each other across the positive electrode plate 11 have a size sufficient to be heat-sealed by the cut portion 12. It is.
  • the negative electrode plate 16 is also formed with a pair of cut portions 17. Similarly to the cutout part 12 of the positive electrode plate 11, the cutout part 17 of the negative electrode plate 16 also partially removes the non-application part 16b at the intermediate position in the longitudinal direction of the two opposite sides of the negative electrode plate 16. It is formed by excision. Further, the position where the cut portion 17 is formed is a position corresponding to the edge of the separator 15 on the side opposite to the side where the non-coated portion rib of the positive electrode plate 11 is extended, specifically, the separator 15. When the negative electrode plate 16 is overlaid on a regular position on the accommodated positive electrode plate 11, the separator 15 overlaps with the edge of the positive electrode plate 11 opposite to the non-coated portion ib side. .
  • the positive electrode plate 11 and the negative electrode plate 16 are stacked so that the non-applied portion l ib of the positive electrode plate 11 and the non-applied portion 16b of the negative electrode plate 16 extend on opposite sides, for example, the positive electrode plate 11
  • the size force of the separator 15 containing the negative electrode plate 16 is difficult to align with the positive electrode plate 11 if the size of the separator 15 is hidden under the negative electrode plate 16 superimposed thereon. Therefore, by forming the cutout portion 17 in the negative electrode plate 16 as described above, the edge of the separator 15 can be recognized through the cutout portion 17, and the negative electrode plate 16 can be easily positioned with respect to the separator 15. Can do. Since the position of the positive electrode plate 11 with respect to the separator 15 is fixed by the heat fusion part 15a, the negative electrode plate 16 and the separator 15 are positioned, whereby the positive electrode plate 11 and the negative electrode plate 16 are positioned. .
  • the shape and size of the cut portion 17 of the negative electrode plate 16 are arbitrary as long as the lower separator 15 can be confirmed through the cut portion 17.
  • the cut portions 17 of the negative electrode plate 16 are provided on two sides facing each other.
  • the cut portion 17 may be provided only on one side.
  • One of the factors that determine the output characteristics (discharge characteristics) of the film-clad battery 1 is the facing area between the positive electrode material application part 11a and the negative electrode material application part 16a.
  • the facing area between the positive electrode material application portion 11a and the negative electrode material application portion 16a is also stable with little variation, and as a result, the output A film-clad battery 1 with little variation in characteristics can be obtained.
  • the positive electrode plate 11 and the negative electrode plate 16 have different specific dimensions. However, since they have substantially the same shape and configuration, they can be manufactured through similar steps. In the following description, unless otherwise specified, the description will be made assuming that the positive electrode plate 11 and the negative electrode plate 16 are common, and the positive electrode and the negative electrode are collectively referred to as electrodes.
  • an electrode material application portion 21a is applied to the metal foil 20 by intermittently applying an active material to both surfaces of the strip-shaped metal foil 20 with a constant pitch in the longitudinal direction of the metal foil 20. And non-coated portions 21b are alternately formed.
  • the length of the electrode material application part 21a and the non-application part 21b in the longitudinal direction of the metal foil 20 is longer than the length of the electrode material application part 2la and the non-application part 21b in the finally obtained electrode plate. Make it a few mm longer.
  • the metal foil 20 coated with the active material is cut along the width direction of the metal foil 20 at the portion where the electrode material coating portion 2 la is formed.
  • the cutting of the metal foil 20 is performed by applying the electrode material on the electrode plate in which the length of the electrode material coating part 21a is finally obtained with reference to the edge of the electrode material application part 21a in the longitudinal direction of the metal foil 20.
  • the length is equal to the length of part 21a.
  • the size of the electrode material application portion 21a greatly affects the performance of the obtained battery.
  • the variation in coating length tends to be relatively large in the electrode material coating portion 21a where it is difficult to strictly control the variation in dimensions of the coating film. Therefore, by cutting the metal foil 20 on the electrode material application part 21a to have a predetermined size as described above, the dimensions of the electrode material application part 21a can be managed more accurately.
  • the cut portions 22 are formed by punching both sides in the width direction of the metal foil 20 in the non-application portion 21b of the metal foil 20. Thereby, the electrode plate 21 is produced. If the positive electrode material is used as the active material applied to the metal foil 20 and both surfaces thereof, the obtained material becomes a positive electrode plate, and if the negative electrode material is used as the active material applied to the metal foil 20 and both surfaces thereof, What was obtained becomes a negative electrode plate.
  • the cut portion 22 is a portion to which a separator that covers the electrode material application portion 21a is heat-sealed, and the separator is also used for positioning the negative electrode plate. Is done.
  • the cut portion 22 is used for positioning with the separator. Therefore, the position of the cut portion 22 relative to the electrode material application portion 21a is important. Therefore, the position of the cut portion 22 is preferably determined with reference to the edge of the electrode material application portion 21a that has been cut to a predetermined size.
  • the positive electrode plate 11 and the negative electrode plate 16 cut the strip-shaped metal foil 20 coated with the electrode material in the width direction at regular intervals, and form the cut portions 22 at predetermined locations. It can be produced simply by The metal foil 20 can be cut with a general cutting machine, and the cut portion 22 can also be formed with a punch cache. Therefore, the production of the positive electrode plate 11 and the negative electrode plate 16 is very simple.
  • the positive electrode plate 11 produced as described above is inserted into a separator 15 formed in a bag shape.
  • the bag-shaped separator 15 is formed by superimposing two separator sheets on each other and heat-sealing the three surrounding sides so that only the side where the non-coated portion ib of the positive electrode plate 11 opens is opened. can do.
  • the separator 15 may be formed by folding one sheet in half and heat-sealing the remaining two open sides so that only the side where the non-coated portion ib of the positive electrode plate 11 opens is opened. it can.
  • the separator 15 that is opposed to the positive electrode plate 11 is heat-sealed at the position of the cut portion 12. Thereby, the positive electrode plate 11 and the separator 15 are fixed.
  • the negative electrode plate 16 and the positive electrode plate 11 accommodated and held in the separator 15 are alternately stacked.
  • the facing area between the positive electrode material application portion 11a of the positive electrode plate 11 and the negative electrode material application portion 16a of the negative electrode plate 16 greatly affects the characteristics of the battery, the lamination of the positive electrode plate 11 and the negative electrode plate 16 is , While aligning with each other.
  • the alignment in the X direction is performed so that the position of the edge 15 b of the separator 15 in the X direction coincides with the cut portion 17 of the negative electrode plate 16. More specifically, when the positive electrode plate 11 is overlaid on the negative electrode plate 16, the positive electrode plate 11 is overlaid so that the edge 15 b of the separator 15 is positioned on the cut portion 17, and the negative electrode plate 16 is overlaid on the positive electrode plate 11. When stacking, the negative electrode plate 16 is stacked so that the edge 15c of the separator 15 can be seen through the cut portion 17.
  • the positive electrode plate 11 and the negative electrode plate 16 can be aligned based on the positional relationship between the cut portion 17 of the negative electrode plate 16 and the side edge 15c of the separator 15. These alignments can be performed by visual inspection by an operator or using an optical detection device. [0053] After a predetermined number of positive electrode plates 11 and negative electrode plates 16 are stacked, the stacked state of positive electrode plates 11 and negative electrode plates 16 is held using a fixture such as a clip or a tape.
  • the leading end portions of the non-applied portions l ib and 16b extending from the positive electrode plate 11 and the negative electrode plate 16 are trimmed so that no portion to which the electrode material is applied remains, and collectively,
  • the non-coated portion l ib of the positive electrode plate 11 is ultrasonically welded together with the positive electrode tab 3a (see FIG. 1)
  • the non-coated portion 16b of the negative electrode plate 16 is ultrasonically welded together with the negative electrode tab 3b (see FIG. 1).
  • the electrode laminate 2 (see Fig. 1) is produced.
  • the produced electrode laminate 2 is sealed together with the electrolytic solution with an exterior film 4, 5 (see FIG. 1).
  • the electrode stack 2 can be sealed as follows, for example.
  • the electrode laminate 2 is sandwiched between two exterior films 4 and 5 so that the positive electrode tab 3a and the negative electrode tab 3b extend the exterior films 4 and 5 as well.
  • the three sides around the outer films 4 and 5 are heat-sealed.
  • the clip is removed before heat-sealing the exterior films 4 and 5.
  • the tape may be left attached. Thereafter, the electrolyte solution is injected from the remaining one side not heat-sealed to impregnate the electrode laminate 2.
  • the assembly in which the electrode stack 2 is impregnated with the electrolyte is placed in a vacuum chamber, and the remaining one side of the outer films 4 and 5 is heat-sealed in a reduced-pressure atmosphere. As a result, the electrode laminate 2 is sealed.
  • the positive electrode plate 11 and the negative electrode plate 16 are substantially rectangular, a strip-shaped material can be used for the manufacture thereof, and the force is also added as a post process. Since only the cutting of the strip-shaped material and the formation of the cut-out portion, no special processing or process is required to manufacture the positive electrode plate 11 and the negative electrode plate 16. Further, when the positive electrode plate 11 and the negative electrode plate 16 are laminated, the positioning of the positive electrode plate 11 and the separator 15 is not necessary. Further, the positive electrode plate 11 and the negative electrode plate 16 can be easily positioned by using the cut portion 17 formed in the negative electrode plate 16. Guess. As described above, according to the present embodiment, it is possible to easily perform the electrode laminate 2 and thus the film outer battery 1.
  • the electrode laminate 2 is sealed in a reduced-pressure atmosphere, but this step may be performed in an atmospheric pressure.
  • the electrode laminate 2 may be sandwiched by folding one exterior film in half.
  • a container with rigidity such as a metal container and a plastic container, may be sufficient.
  • FIG. 6 shows another form of the positive electrode plate.
  • the separator 15 may be heat-sealed so that a region where the separator 15 does not exist is formed in the cut portion 17.
  • the holding force of the separator 15 on the positive electrode plate 11 becomes weaker than that in the example shown in FIG.
  • the separator 15 it is sufficient if the separator 15 can be held against the positive electrode plate 11.
  • the force that can be applied not only to the form shown in FIG. 6 but also to the form shown in FIG. Since the position of the positive electrode plate 11 is regulated to some extent, the cut portion 12 may be provided only on one side of the positive electrode plate 11.
  • FIG. 7 shows still another form of the positive electrode plate.
  • the position of the cut portion 42 is the same as the example shown in FIG. 6 in the X direction corresponding to FIG. 2, and in the intermediate part of the positive electrode plate 41 in the Y direction. Yes.
  • the separator 45 covers only a part of the cut portion 42 and is heat-sealed in a region including the portion covering the cut portion 42. As a result, a heat fusion part 45 a is formed in the separator 45, and the separator 45 is held by the positive electrode plate 41.
  • a plurality of cut portions 42 may be provided along the force Y direction showing one cut portion 42, and the heat fusion portion 45a may be formed for each cut portion.
  • excision part 42 shown in FIG. 7 can be combined with the excision part 12 shown in FIG. Furthermore, the configuration shown in FIG. 7 can be applied not only to the positive electrode side but also to the negative electrode side. In that case, the heat fusion part 45a is unnecessary.
  • FIG. 8 shows another embodiment of the separator that sandwiches the positive electrode plate.
  • the separator does not have to be in a bag-like shape.
  • the separator for example, one formed by continuously or intermittently heat-sealing at least one side of two sheets superposed on each other can be cited. Further, as shown in FIG. 8A, the sheet-like separator 53 is folded in half, the positive electrode plate 11 is accommodated therebetween, and the opposing regions of the separator 53 are heat-sealed with each other at the cutout portion 12. Accordingly, the separator 53 may be held on the positive electrode plate 11. In this case as well, as in the case where the bag-shaped separator is accommodated, the cut portion 12 may be provided at one location.
  • the cut portion 12 at a position corresponding to the opened side of the separator 53.
  • Each of these, including the bag-shaped separator described above, has a first portion located on one surface side of the electrode plate to be accommodated and a second portion located on the other surface side. Construct a separator that holds plates one by one.
  • two sheet-like separators 55 are arranged opposite to each other with the positive electrode plate 11 interposed therebetween, and the separators 55 are heat-sealed at the cut portion 12 to thereby positive electrode plate 11 may hold a separator.
  • the heat-sealed portion of the separator 55 is indicated by a shaded area.
  • the cut portion 12 provided in the positive electrode plate 11 may be one place, but in the case of the sheet-shaped separator 55 as in this embodiment, the positive electrode plate 11 In order to hold the separator 55 so that it is difficult to cause displacement, at least two cutouts 12 are required.
  • FIG. 9 shows another form of the negative electrode plate.
  • the negative electrode plate 66 shown in FIG. 9 is different from the above-described embodiment in that the shape of the cut portion 67 is a triangle.
  • the cut portion 6 Both can be aligned so that the edge 65b of the separator 65 matches the position of the apex of 7. Thereby, the alignment accuracy between the separator 65 and the negative electrode plate 66 is improved.
  • FIG. 10 shows still another form of the negative electrode plate.
  • the mark 77 may be used as the configuration provided on the negative electrode plate 76 in order to confirm the mutual position of the separator 75 and the negative electrode plate 76.
  • the mark 77 has a triangular shape in FIG. 10, but the shape is arbitrary as long as it can indicate the position of the edge 75b of the separator 75, and the line drawn in parallel to the Y direction is also used. It may be.
  • These marks can be formed by printing or the like.
  • a pair of cut portions or marks can also be formed on the positive electrode plate, and the cut portions or marks can be used for alignment between the separator and the positive electrode plate.
  • each of the positive electrode plate and the negative electrode plate holds a separator on both front and back surfaces, and in a state where the positive electrode plate and the negative electrode plate are laminated, there are two separators between the positive electrode plate and the negative electrode plate. Also good.
  • the present invention is configured so that electric energy is internally contained in a capacitor element such as an electrolytic capacitor or the like such as an electric double layer capacitor. It can be applied to an electrical device in which the accumulated electrode stack is sealed with an exterior material.

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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)
  • Secondary Cells (AREA)

Abstract

Electrode multicouche (2) formée en empilant une pluralité de plaques positives (11) et une pluralité de plaques négatives (16) alternativement avec des séparateurs (15) interposés entre elles. Chacune des plaques positives (11) et des plaques négatives (16) est rectangulaire et sectionnée en une région rectangulaire enduite d’un matériau pour électrode sur les côtés opposés et en une région s’étendant d’un côté de la région rectangulaire et non enduite du matériau pour électrode. Chaque séparateur (15) a la forme d’un sac, et le côté correspondant à la région de l’électrode positive (11) non enduite du matériau pour électrode est étendu afin de maintenir la plaque positive (11). Une coupure (12) est effectuée dans une partie de la plaque positive (11) au moins partiellement couverte par le séparateur, et les régions opposées des séparateurs (15) sont fusionnées thermiquement via la coupure (12).
PCT/JP2006/303387 2005-03-07 2006-02-24 Électrode multicouche, dispositif électrique utilisant l’électrode multicouche et méthode pour les fabriquer WO2006095579A1 (fr)

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JP2009123582A (ja) * 2007-11-16 2009-06-04 Nec Tokin Corp 積層型二次電池
JP2009283141A (ja) * 2008-05-19 2009-12-03 Nissan Motor Co Ltd 積層型電池の製造方法
JP2010232145A (ja) * 2009-03-30 2010-10-14 Sanyo Electric Co Ltd 積層式電池およびその製造方法
JP2012014935A (ja) * 2010-06-30 2012-01-19 Mitsubishi Heavy Ind Ltd 電池
JP2012054194A (ja) * 2010-09-03 2012-03-15 Nec Energy Devices Ltd 積層型二次電池
WO2012081331A1 (fr) * 2010-12-16 2012-06-21 東レエンジニアリング株式会社 Procédé de fabrication d'un accumulateur secondaire et dispositif de fabrication
WO2012137926A1 (fr) * 2011-04-07 2012-10-11 日産自動車株式会社 Dispositif et procédé de stratification d'électrodes
JP2012221713A (ja) * 2011-04-07 2012-11-12 Kyoto Seisakusho Co Ltd 電極位置検出装置および電極位置検出方法
JP2012227129A (ja) * 2011-04-07 2012-11-15 Nissan Motor Co Ltd 電極積層装置および電極積層方法
WO2013031889A1 (fr) * 2011-08-31 2013-03-07 Ｎｅｃエナジーデバイス株式会社 Procédé de fabrication d'une électrode de cellule
WO2013146513A1 (fr) * 2012-03-30 2013-10-03 三洋電機株式会社 Batterie stratifiée
JP2013229173A (ja) * 2012-04-25 2013-11-07 Toyota Industries Corp 蓄電装置
JP2014049193A (ja) * 2012-08-29 2014-03-17 Toyota Industries Corp 蓄電装置及び積層ずれ検査方法
EP2750240A1 (fr) * 2012-05-29 2014-07-02 LG Chem, Ltd. Ensemble électrode, élément de batterie, procédé de fabrication pour un ensemble électrode et procédé de fabrication pour un élément de batterie
JP2014232591A (ja) * 2013-05-28 2014-12-11 株式会社デンソー 二次電池の電池要素及びその製造方法
CN113637995A (zh) * 2021-08-17 2021-11-12 周康 一种循环电解水制造用叠片式电解槽及其叠片工艺
JP2022105897A (ja) * 2021-01-05 2022-07-15 プライムプラネットエナジー＆ソリューションズ株式会社 非水電解液二次電池

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JP2009123582A (ja) * 2007-11-16 2009-06-04 Nec Tokin Corp 積層型二次電池
JP2009283141A (ja) * 2008-05-19 2009-12-03 Nissan Motor Co Ltd 積層型電池の製造方法
JP2010232145A (ja) * 2009-03-30 2010-10-14 Sanyo Electric Co Ltd 積層式電池およびその製造方法
JP2012014935A (ja) * 2010-06-30 2012-01-19 Mitsubishi Heavy Ind Ltd 電池
JP2012054194A (ja) * 2010-09-03 2012-03-15 Nec Energy Devices Ltd 積層型二次電池
WO2012081331A1 (fr) * 2010-12-16 2012-06-21 東レエンジニアリング株式会社 Procédé de fabrication d'un accumulateur secondaire et dispositif de fabrication
CN103460497A (zh) * 2011-04-07 2013-12-18 日产自动车株式会社 电极层叠装置以及电极层叠方法
WO2012137926A1 (fr) * 2011-04-07 2012-10-11 日産自動車株式会社 Dispositif et procédé de stratification d'électrodes
JP2012221713A (ja) * 2011-04-07 2012-11-12 Kyoto Seisakusho Co Ltd 電極位置検出装置および電極位置検出方法
JP2012227129A (ja) * 2011-04-07 2012-11-15 Nissan Motor Co Ltd 電極積層装置および電極積層方法
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TWI478425B (zh) * 2011-04-07 2015-03-21 Nissan Motor Electrode Layers and Electrode Layers
CN103782419A (zh) * 2011-08-31 2014-05-07 Nec能源元器件株式会社 制造电池电极的方法
JPWO2013031889A1 (ja) * 2011-08-31 2015-03-23 Ｎｅｃエナジーデバイス株式会社 電池用電極の製造方法
WO2013031889A1 (fr) * 2011-08-31 2013-03-07 Ｎｅｃエナジーデバイス株式会社 Procédé de fabrication d'une électrode de cellule
US9502712B2 (en) 2011-08-31 2016-11-22 Nec Energy Devices, Ltd. Method of manufacturing battery electrode
CN104205464A (zh) * 2012-03-30 2014-12-10 三洋电机株式会社 层叠式电池
JPWO2013146513A1 (ja) * 2012-03-30 2015-12-14 三洋電機株式会社 積層式電池
WO2013146513A1 (fr) * 2012-03-30 2013-10-03 三洋電機株式会社 Batterie stratifiée
JP2013229173A (ja) * 2012-04-25 2013-11-07 Toyota Industries Corp 蓄電装置
US9048510B2 (en) 2012-05-29 2015-06-02 Lg Chem, Ltd. Electrode assembly, battery cell, manufacturing method of electrode assembly, and manufacturing method of battery cell
EP2750240A4 (fr) * 2012-05-29 2015-01-07 Lg Chemical Ltd Ensemble électrode, élément de batterie, procédé de fabrication pour un ensemble électrode et procédé de fabrication pour un élément de batterie
US9728758B2 (en) 2012-05-29 2017-08-08 Lg Chem, Ltd. Electrode assembly, battery cell, manufacturing method of electrode assembly, and manufacturing method of battery cell
EP2750240A1 (fr) * 2012-05-29 2014-07-02 LG Chem, Ltd. Ensemble électrode, élément de batterie, procédé de fabrication pour un ensemble électrode et procédé de fabrication pour un élément de batterie
JP2014049193A (ja) * 2012-08-29 2014-03-17 Toyota Industries Corp 蓄電装置及び積層ずれ検査方法
JP2014232591A (ja) * 2013-05-28 2014-12-11 株式会社デンソー 二次電池の電池要素及びその製造方法
JP2022105897A (ja) * 2021-01-05 2022-07-15 プライムプラネットエナジー＆ソリューションズ株式会社 非水電解液二次電池
JP7304369B2 (ja) 2021-01-05 2023-07-06 プライムプラネットエナジー＆ソリューションズ株式会社 非水電解液二次電池
CN113637995A (zh) * 2021-08-17 2021-11-12 周康 一种循环电解水制造用叠片式电解槽及其叠片工艺

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