WO2016088505A1 - Rectangular secondary cell - Google Patents

Rectangular secondary cell Download PDF

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Publication number
WO2016088505A1
WO2016088505A1 PCT/JP2015/081243 JP2015081243W WO2016088505A1 WO 2016088505 A1 WO2016088505 A1 WO 2016088505A1 JP 2015081243 W JP2015081243 W JP 2015081243W WO 2016088505 A1 WO2016088505 A1 WO 2016088505A1
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WO
WIPO (PCT)
Prior art keywords
electrode group
plate
battery
secondary battery
electrode
Prior art date
Application number
PCT/JP2015/081243
Other languages
French (fr)
Japanese (ja)
Inventor
修 久保田
貴宏 相馬
明秀 田中
Original Assignee
日立オートモティブシステムズ株式会社
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Application filed by 日立オートモティブシステムズ株式会社 filed Critical 日立オートモティブシステムズ株式会社
Publication of WO2016088505A1 publication Critical patent/WO2016088505A1/en

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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
    • H01M50/40—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
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present invention relates to a prismatic secondary battery used for, for example, in-vehicle use.
  • an in-vehicle power source that supplies power to an electric motor or the like mounted on a vehicle such as an electric vehicle or a hybrid electric vehicle, or a square shape such as a lithium ion secondary battery having a high energy density as a power source for other devices. Secondary batteries are used.
  • a nonaqueous electrolyte battery includes, for example, a container, an electrode group housed in the container, and spirally wound via a separator between a positive electrode and a negative electrode, and a non-aqueous electrolyte housed in the container.
  • a water electrolyte is provided (see Patent Document 1 below).
  • the non-aqueous electrolyte battery described in Patent Document 1 has a problem in that the porosity of the positive and negative electrodes and the separator is lowered to ensure the discharge capacity, and the impregnation of the non-aqueous electrolyte into the positive and negative electrodes and the separator is deteriorated.
  • the nonaqueous electrolyte battery includes a tab electrically connected to a positive electrode or a negative electrode of an electrode group, and the electrode group so as to include an end surface opposite to an end surface to which the tab is connected, and the opposite side
  • the insulator which has an adhesive layer other than the location which opposes the end surface of this is comprised.
  • an insulating spacer and an insulating tape are attached to the flat wound electrode body, the positive electrode tab and the negative electrode tab are bent into predetermined shapes, respectively, and then the flat wound electrode body. Is inserted into a rectangular metal battery outer body whose one end surface in the longitudinal direction is open and whose peripheral surface is closed (see Patent Document 2 below).
  • JP 2010-73580 A International Publication No. 2012/090726
  • the nonaqueous electrolyte battery described in Patent Document 1 is coated with an insulator so as to include an end surface opposite to the end surface to which the tab of the electrode group is connected, so that insulation between the electrode group and the container is provided.
  • an insulator so as to include an end surface opposite to the end surface to which the tab of the electrode group is connected, so that insulation between the electrode group and the container is provided.
  • the insertion direction of the electrode group when the spirally wound electrode group is inserted into the opening of the battery exterior body is a direction along the winding center axis. Therefore, when the electrode group is inserted into the battery outer package, or after the electrode group is inserted into the battery outer package, the positive and negative electrodes and the separator are unwound along the winding central axis, and the end surface in the winding central axis direction is There is a risk of protruding in a so-called bowl shape. Such winding deviation cannot be prevented even if the end face of the electrode group is covered with a thin and flexible sheet-like insulator having no rigidity.
  • the nonaqueous electrolyte secondary battery described in Patent Document 2 has insulating spacers attached to both ends of the flat wound electrode group in the direction of the central axis of the winding, but the nonaqueous electrolyte secondary battery has both ends of the nonaqueous electrolyte secondary battery. The whole is covered with an insulating spacer. Therefore, the volume increase in the thickness direction of the battery is caused.
  • the present invention has been made in view of the above problems, and an object of the present invention is to provide a prismatic secondary battery that prevents an electrode group from being unwound and does not cause an increase in volume in the thickness direction of the battery. .
  • a prismatic secondary battery comprises a flat rectangular battery container, and positive and negative electrodes wound around a winding axis that is accommodated in the battery container and perpendicular to the bottom surface of the battery container. And a flat electrode group, wherein the electrode group is disposed between the bottom surface of the battery container and an end portion of the electrode group facing the bottom surface in the winding axis direction.
  • a plate-like member having rigidity whose dimension in the thickness direction is smaller than the thickness is disposed.
  • the displacement of the electrode group is prevented by the rigidity of the plate-like member between the bottom surface of the battery container and the end portion of the electrode group facing the bottom surface in the winding axis direction. be able to. Moreover, since the dimension of the plate-shaped member in the thickness direction of the electrode group is smaller than the thickness of the electrode group, the volume in the thickness direction of the battery is not increased.
  • FIG. 1 is an external perspective view showing Embodiment 1 of a prismatic secondary battery of the present invention.
  • the disassembled perspective view of the electrode group shown in FIG. FIG. 3 is a perspective view of an electrode group and a plate member shown in FIG. 2.
  • the enlarged side view which shows an example of the fixing method of the electrode group and plate-shaped member which are shown in FIG.
  • the enlarged side view which shows an example of the fixing method of the electrode group and plate-shaped member which are shown in FIG.
  • Sectional drawing which follows the longitudinal direction which shows the modification 1 of the plate-shaped member shown in FIG. It is sectional drawing which shows the modification 2 of the plate-shaped member shown in FIG.
  • FIG. 4 (a) is sectional drawing which follows a longitudinal direction, (b) is sectional drawing which follows a transversal direction.
  • the perspective view which shows the modification 3 of the plate-shaped member shown in FIG. FIG. 6 is a cross-sectional view taken along the line XX shown in FIG. 1 showing Embodiment 2 of the prismatic secondary battery of the present invention.
  • FIG. 1 is an external perspective view of a prismatic secondary battery 100 of the present embodiment.
  • FIG. 2 is an exploded perspective view of the prismatic secondary battery 100 shown in FIG.
  • the prismatic secondary battery 100 of the present embodiment is, for example, a prismatic lithium ion secondary battery including a flat rectangular battery container 10.
  • the battery container 10 includes a bottomed rectangular tube-shaped battery can 11 having an opening 11d at the top, and a rectangular plate-shaped battery lid 12 that seals the opening 11d of the battery can 11.
  • the battery can 11 has a wide side wall 11a having a maximum area along the width direction, a narrow side wall 11b having a small area along the thickness direction, and a bottom wall 11c facing the upper opening 11d.
  • the battery can 11 and the battery lid 12 are made of a metal material such as aluminum or an aluminum alloy, for example.
  • positive and negative external terminals 20A and 20B are arranged outside the battery lid 12.
  • the positive external terminal 20A is made of, for example, aluminum or an aluminum alloy
  • the negative external terminal 20B is made of, for example, copper or a copper alloy.
  • the external terminals 20A and 20B of the positive electrode and the negative electrode are collectively referred to as the external terminal 20.
  • the battery lid 12 has through holes 12a at both ends where the external terminals 20 are disposed.
  • the gasket 2 is disposed between the external terminal 20 and the battery lid 12 around the through hole 12a.
  • the gasket 2 electrically insulates the external terminal 20 and the battery cover 12 and is compressed between the external terminal 20 and the battery cover 12 so as to be in close contact therewith, thereby sealing the through hole 12a of the battery cover 12. ing.
  • the gasket 2 is made of an insulating resin material such as polybutylene terephthalate, polyphenylene sulfide, or perfluoroalkoxy fluororesin.
  • the gas discharge valve 13 is provided, for example, by thinning the battery lid 12 to form a groove 13a, and is cleaved to release the internal gas when the internal pressure of the battery container 10 exceeds a predetermined value. As a result, the pressure inside the battery container 10 is reduced.
  • the liquid injection port 14 is used for injecting an electrolytic solution into the battery container 10, and the liquid injection plug 15 is welded and sealed by laser welding, for example.
  • the external terminal 20 has a weld joint 21 that is welded to a bus bar or the like.
  • the welded joint portion 21 is formed in a block shape having a substantially rectangular parallelepiped shape, the lower end surface faces the upper surface of the battery lid 12, and the upper end surface is parallel to the upper surface of the battery lid 12.
  • a columnar connection portion 22 extending in a direction perpendicular to the upper surface of the battery lid 12 is provided on the lower end surface of the weld joint portion 21.
  • the positive and negative current collecting plates 30 ⁇ / b> A and 30 ⁇ / b> B are respectively bent at the rectangular plate-like base portion 31 disposed opposite to the lower surface of the battery lid 12 and the side end of the base portion 31, and are formed on the wide side wall 11 a of the battery can 11. And a terminal portion 32 extending toward the bottom wall 11c.
  • the positive and negative current collecting plates 30A and 30B are electrically connected to the electrode group 40 by joining the terminal portions 32 to the tab portions 41c and 42c of the electrode group 40 by, for example, ultrasonic welding or resistance welding.
  • the electrode group 40 is supported in the battery container 10 while being connected.
  • the positive current collecting plate 30A is made of, for example, aluminum or an aluminum alloy
  • the negative current collecting plate 30B is made of, for example, copper or a copper alloy.
  • the positive and negative current collecting plates 30A and 30B are collectively referred to as the current collecting plate 30.
  • the insulating plate 3 is disposed between the base 31 of the current collecting plate 30 and the battery lid 12, and the battery lid 12 and the current collecting plate 30 are electrically insulated.
  • the insulating plate 3 is made of, for example, a resin material having insulation similar to that of the gasket 2.
  • External terminal 20, gasket 2, insulating plate 3, and current collector plate 30 are caulked and fixed to battery lid 12.
  • the connecting portion 22 of the external terminal 20 is inserted into the through hole 2 a of the gasket 2, the through hole 12 a of the battery cover 12, the through hole 3 a of the insulating plate 3, and the through hole 31 a of the base 31 of the current collector plate 30.
  • the tip of the connecting portion 22 is plastically deformed to expand the diameter, thereby forming the caulking portion 22c.
  • the external terminal 20, the gasket 2, the insulating plate 3, and the current collecting plate 30 are caulked and fixed to the battery lid 12, and the positive and negative external terminals 20A and 20B are connected to the positive and negative current collecting plates 30A and 30B, respectively.
  • FIG. 3 is an exploded perspective view in which a part of the electrode group 40 shown in FIG. 2 is developed.
  • the electrode group 40 is a flat wound electrode group in which positive and negative electrodes 41 and 42 are wound around a central axis of winding, that is, a winding axis A. More specifically, the electrode group 40 is formed into a flat shape by winding the positive and negative electrodes 41 and 42 laminated with the separators 43 and 44 interposed therebetween around an axis parallel to the winding axis A. This is a wound electrode group.
  • the separators 43 and 44 are, for example, porous resin sheets manufactured by stretching a polyethylene resin or a polypropylene resin, and insulate the positive electrode 41 and the negative electrode 42 from each other.
  • the electrode group 40 can be manufactured by the following procedure, for example. First, the winding start ends of the separators 43 and 44 are welded to a shaft core (not shown), and the separators 43 and 44 and the positive and negative electrodes 41 and 42 are alternately overlapped and wound. At this time, the starting end portion of the positive electrode 41 is arranged closer to the axial center side than the starting end portion of the negative electrode 42 and wound. Thereby, in the electrode group 40 after winding, the winding start end portion of the positive electrode 41 is positioned closer to the axial center side than the winding start end portion of the negative electrode 42.
  • the separator 44 is wound around the electrode group 40 more than once around the electrode group 40 after the negative electrode 42 has been wound.
  • the wound end is fixed by, for example, an adhesive tape for preventing winding looseness.
  • the width, length, and thickness of the adhesive tape are not particularly limited, and for example, the entire outer periphery of the electrode group may be covered.
  • the positive electrode 41 has a positive electrode foil 41a that is a positive electrode current collector, and a positive electrode mixture layer 41b made of a positive electrode active material mixture applied to both surfaces of the positive electrode foil 41a.
  • One side in the width direction of the elongated positive electrode 41 is a current collector exposed portion where the positive electrode mixture layer 41b is not formed and the positive foil 41a is exposed, and the current collector exposed portion is cut out to form a plurality.
  • the tab portion 41c is formed.
  • the tab portion 41 c protrudes in the width direction of the positive electrode 41 and protrudes from end portions in the width direction of the separators 43 and 44.
  • the spacing between the tab portions 41c is adjusted so that the plurality of tab portions 41c of the positive electrode 41 are bundled together at a position corresponding to the terminal portion 32 of the positive current collector plate 30A after the electrode group 40 is wound. ing.
  • the positive electrode 41 for example, a positive electrode active material mixture kneaded by adding a conductive material, a binder and a dispersion solvent to the positive electrode active material, is applied to both surfaces of the positive electrode foil 41a except for one side in the width direction, It can be produced by drying, pressing and cutting.
  • As the positive electrode foil 41a for example, an aluminum foil having a thickness of about 15 ⁇ m can be used.
  • the thickness of the positive electrode mixture layer 41b not including the thickness of the positive electrode foil 41a is, for example, about 70 ⁇ m.
  • the positive electrode active material mixture for example, 100 parts by weight of lithium manganate (chemical formula LiMn 2 O 4 ) is used as the positive electrode active material, 10 parts by weight of flaky graphite as the conductive material, and 10% by weight as the binder.
  • Part of polyvinylidene fluoride (hereinafter referred to as PVDF) and N-methylpyrrolidone (hereinafter referred to as NMP) can be used as a dispersion solvent.
  • the positive electrode active material is not limited to the above-described lithium manganate.
  • another lithium manganate having a spinel crystal structure, or a lithium manganese composite oxide partially substituted or doped with a metal element may be used.
  • lithium cobalt oxide or lithium titanate having a layered crystal structure, or a lithium-metal composite oxide in which a part thereof is substituted or doped with a metal element may be used.
  • the negative electrode 42 has a negative electrode foil 42a which is a negative electrode current collector, and a negative electrode mixture layer 42b made of a negative electrode active material mixture coated on both surfaces of the negative electrode foil 42a.
  • the negative electrode mixture layer 42b is not formed on one side in the width direction of the negative electrode 42, and a current collector exposed portion where the negative electrode foil 42a is exposed is formed, and the current collector exposed portion is cut away to form a tab portion 42c.
  • the tab portion 42 c protrudes in the width direction of the negative electrode 42 and protrudes from the end portions in the width direction of the separators 43 and 44.
  • the spacing between the tab portions 42c is adjusted so that the plurality of tab portions 42c of the negative electrode 42 are bundled together at a position corresponding to the terminal portion 32 of the negative electrode current collector plate 30B after the electrode group 40 is wound. ing.
  • the negative electrode 42 is prepared by applying a negative electrode active material mixture kneaded by adding a binder and a dispersion solvent to the negative electrode active material on both sides of the negative electrode foil 42a except for one side in the width direction, drying, pressing, It can be produced by cutting.
  • a negative electrode foil 42a for example, a copper foil having a thickness of about 10 ⁇ m can be used.
  • the thickness of the negative electrode mixture layer 42b not including the thickness of the negative electrode foil 42a is, for example, about 40 ⁇ m.
  • the negative electrode active material mixture for example, 100 parts by weight of amorphous carbon powder as the negative electrode active material, 10 parts by weight of PVDF as the binder, and NMP as the dispersion solvent can be used.
  • the negative electrode active material is not limited to the above-mentioned amorphous carbon, and natural graphite capable of inserting and removing lithium ions, various artificial graphite materials, carbonaceous materials such as coke, and compounds such as Si and Sn (for example, , SiO, TiSi 2 or the like), or a composite material thereof.
  • the particle shape of the negative electrode active material is not particularly limited, and a particle shape such as a scale shape, a spherical shape, a fiber shape, or a lump shape can be appropriately selected.
  • the binder used for the positive electrode and negative electrode mixture layers 41b and 42b is not limited to PVDF.
  • the binder include polytetrafluoroethylene (PTFE), polyethylene, polystyrene, polybutadiene, butyl rubber, nitrile rubber, styrene butadiene rubber, polysulfide rubber, nitrocellulose, cyanoethyl cellulose, various latexes, acrylonitrile, and vinyl fluoride.
  • Polymers such as vinylidene fluoride, propylene fluoride, chloroprene fluoride, and acrylic resins, and mixtures thereof may be used.
  • the axial core when winding the positive electrode 41 and the negative electrode 42 with the separators 43 and 44 interposed therebetween is, for example, more flexible than the positive foil 41a, the negative foil 42a, and the separators 43 and 44.
  • a roll of a high resin sheet can be used.
  • the width of the negative electrode mixture layer 42b of the negative electrode 42 is wider than the width of the positive electrode mixture layer 41b of the positive electrode 41.
  • a negative electrode 42 is wound around the innermost and outermost circumferences of the electrode group 40.
  • the positive electrode mixture layer 41b is sandwiched between the negative electrode mixture layer 42b from the innermost periphery to the outermost periphery of the electrode group 40.
  • the end portion of the negative electrode 42 is at the end portion 40d facing the bottom wall 11c of the battery can 11 opposite to the end portion 40c where the tab portions 41c and 42c are formed. Is arranged on the outermost side. Furthermore, in the winding axis A direction of the electrode group 40, the end portions of the separators 43 and 44 are arranged inside the end portion of the negative electrode 42 with an interval of 2 mm or less, for example. The end of the positive electrode 41 is disposed on the inner side with an interval of, for example, 2 mm or more and 4 mm or less.
  • the end wall of the negative electrode 42 wound on the end portion 40 d facing the bottom wall 11 c of the battery can 11 has the bottom wall of the battery can 11. An end surface facing 11c is formed.
  • FIG. 4 is a perspective view of the electrode group 40 and the plate-like member 50 shown in FIG.
  • the plate-like member 50 is an insulating plate-like member made of, for example, a resin material such as polyethylene, PTFE, or vinyl chloride, or a fiber reinforced plastic resin such as FRP or GFRP.
  • the plate-like member 50 has rigidity capable of supporting or pressing the end face formed by the end portion 40 d of the electrode group 40, that is, the end portion of the negative electrode 42.
  • the plate-like member 50 of the present embodiment has an end of the electrode group 40 when the electrode group 40 is inserted into the battery can 11 or when the electrode group 40 repeatedly expands and contracts in the battery container 10. Resisting against the force acting from the portion 40d, the shape of the end portion 40d of the electrode group 40 can be maintained to prevent the loosening of the winding.
  • the rigidity of the plate-like member 50 described above can be obtained by setting the thickness T 50 of the plate-like member 50 made of the above material to, for example, 0.8 mm or more. Note that the deflection of the plate-like member 50 varies depending on the Young's modulus, the secondary moment of section, and the load acting from the end 40 d of the electrode group 40. Therefore, the thickness T 50 of the plate-like member 50 can be appropriately changed within the range having the above-described rigidity in consideration of the deflection of the plate-like member 50.
  • the plate-like member 50 is disposed between the bottom wall 11c of the battery can 11, that is, the bottom surface of the battery case 10, and the end 40d in the winding axis A direction of the electrode group 40 facing the bottom surface.
  • the plate-like member 50 has a flat upper surface 50 a that contacts the end portion 40 d of the electrode group 40 and a flat lower surface 50 b that faces the bottom wall 11 c of the battery can 11.
  • Dimension W 50 of the plate-like member 50 in the width W 40 direction of the electrode group 40 is the width W 40 of the electrode assembly 40 or less, it is preferably smaller than the width W 40 of the electrode assembly 40.
  • Both end portions in the longitudinal direction of the plate-like member 50 are formed in curved shapes corresponding to the shapes of the curved portions 40 b formed at both end portions in the width W 40 direction of the electrode group 40.
  • the dimensional D 50 of the plate-like member 50 in the thickness T 40 direction of the flat electrode group 40 is smaller than the thickness T 40 of the electrode group 40.
  • the thickness T40 of the electrode group 40 is the distance between the surfaces P1 and P2 when the electrode group 40 is compressed between a pair of parallel surfaces P1 and P2, for example, with a compressive force of 50N or more and 100N or less. Can be defined.
  • the areas of the surfaces P1 and P2 are assumed to be larger than the area of the flat portion 40a of the electrode group 40.
  • FIG. 5 and 6 are enlarged side views showing an example of a method for fixing the plate-like member 50 to the end portion 40d of the electrode group 40.
  • FIG. 5 and 6 are enlarged side views showing an example of a method for fixing the plate-like member 50 to the end portion 40d of the electrode group 40.
  • the plate-like member 50 can be fixed to the end portion 40 d of the electrode group 40 via the adhesive layer 60.
  • the adhesive layer 60 for example, an epoxy resin or an acrylic resin can be used.
  • the plate-like member 50 can be fixed to the end portion 40 d of the electrode group 40 using an adhesive tape 70.
  • the adhesive tape 70 protrudes in the direction of the thickness T 40 of the electrode group 40, but the thickness of the adhesive tape 70 is very thin compared to the thickness T 50 of the plate-like member 50, so There is almost no effect on capacity reduction.
  • the tab portions 41c and 42c of the positive and negative electrodes 41 and 42 are connected to the terminal portions of the positive and negative current collector plates 30A and 30B, respectively, by ultrasonic welding or resistance welding, for example. 32.
  • the electrode group 40 is electrically connected to the external terminal 20 via the current collector plate 30 and is fixed to the battery lid 12 via the insulating plate 3.
  • the width of the separators 43 and 44 is wider than the width of the negative electrode mixture layer 42b, but the tab portions 41c and 42c of the positive electrode 41 and the negative electrode 42 are respectively separated from the separator 43. , 44 protrudes outward in the width direction from the end in the width direction. Therefore, the separators 43 and 44 do not hinder the tab portions 41c and 42c from being bundled and welded.
  • the electrode group 40 and the plate-like member 50 are covered and covered with an insulating protective film 4 made of synthetic resin such as polypropylene, for example, in a state where the electrode group 40 and the plate-like member 50 are joined and supported by a current collector plate 30 that is caulked and fixed to the battery lid 12.
  • the battery can 11 is electrically insulated from the battery can 11 and inserted into the battery can 11 through the opening 11 d of the battery can 11.
  • the lower surface 50 b of the plate-like member 50 may not be covered with the insulating protective film 4.
  • the battery lid 12 is welded over the entire circumference of the opening 11d of the battery can 11 by laser welding, and the opening 11d of the battery can 11 is sealed with the battery lid 12, so that the battery container 10 is Composed.
  • a non-aqueous electrolyte is injected into the battery container 10 through the liquid injection port 14 of the battery lid 12 and, for example, the liquid injection plug 15 is joined to the liquid injection port 14 by laser welding and sealed.
  • the battery container 10 is sealed.
  • the non-aqueous electrolyte to be injected into the electrolyte for example, lithium hexafluorophosphate (LiPF 6 ) is mixed in a mixed solution in which ethylene carbonate and dimethyl carbonate are mixed at a volume ratio of 1: 2. Those dissolved at a concentration of 1 mol / liter can be used.
  • the prismatic secondary battery 100 of the present embodiment accumulates the power supplied from the generator or the like in the electrode group 40 via the external terminal 20 and the current collector plate 30 and accumulates in the electrode group 40. Electric power is supplied to an external motor or the like via the current collector plate 30 and the external terminal 20.
  • the prismatic secondary battery 100 of the present embodiment has rigidity between the bottom wall 11c of the battery can 11, that is, the bottom surface of the battery container 10, and the end portion 40d of the electrode group 40 facing the bottom surface in the winding axis A direction.
  • a plate-like member 50 is disposed.
  • the electrode group 40 when the electrode group 40 is inserted into the opening 11 d of the battery can 11, the end 40 d of the electrode group 40 is supported by the plate-like member 50, thereby preventing the electrode group 40 from being unwound. be able to.
  • the electrode group 40 repeatedly expands and contracts as the prismatic secondary battery 100 is charged and discharged, the end portion 40d of the electrode group 40 is supported by the plate-like member 50, and the electrode group 40 is unwound. It can be prevented from occurring.
  • the plate-like member 50 has a dimension D 50 in the thickness T 40 direction smaller than the thickness T 40 of the electrode group 40. Thereby, the volume increase in the thickness direction of the prismatic secondary battery 100 is not caused. Accordingly, it is possible to prevent a useless space from being generated between the wide side wall 11a of the battery can 11 and the flat portion 40a of the electrode group 40, and to increase the number and thickness of the positive and negative electrodes 41 and 42 of the electrode group 40. The capacity of the square secondary battery 100 can be increased.
  • the plate member 50 When the plate member 50 is fixed to the end portion 40 d of the electrode group 40 via the adhesive layer 60, the plate member 50 is inserted when the electrode group 40 is inserted into the opening portion 11 d of the battery can 11. And displacement of the electrode group 40 can be prevented. In addition, the impact between the plate-like member 50 and the end portion of the electrode group 40 can be reduced by the adhesive layer 60.
  • the plate-like member 50 when the plate-like member 50 is fixed to the end 40 d of the electrode group 40 by the adhesive tape 70, the plate-like member is similarly inserted when the electrode group 40 is inserted into the opening 11 d of the battery can 11. 50 and the electrode group 40 can be prevented from being displaced.
  • the flow of the electrolytic solution between the plate member 50 and the electrode group 40 is not hindered, and the electrolytic solution can be easily impregnated from the end portion 40 d of the electrode group 40.
  • the prismatic secondary battery 100 of the present embodiment it is possible to prevent winding deviation of the electrode group 40 and to prevent an increase in volume in the thickness direction.
  • the structure of the plate-shaped member 50 is the structure demonstrated by this embodiment. It is not limited.
  • Modification 1 to Modification 3 of the plate-like member 50 of the present embodiment will be described.
  • FIG. 7 is a cross-sectional view along the longitudinal direction showing Modification 1 of the plate-like member 50 of Embodiment 1 shown in FIG.
  • the plate-like member 50 ⁇ / b> A of the present modification includes a porous layer 51 that faces the end 40 d of the electrode group 40.
  • the porous layer 51 can impregnate the electrolytic solution in the battery container 10 and impregnate the electrolytic solution from the end portion 40 d of the electrode group 40. Therefore, according to the prismatic secondary battery including the plate-like member 50A of the present modification, not only the same effects as those of the prismatic secondary battery 100 of the first embodiment can be obtained, but also the electrolyte solution impregnation with respect to the electrode group 40. Can be improved.
  • (Modification 2) 8 is a cross-sectional view showing a second modification of the plate-like member 50 of the first embodiment shown in FIG. 4, where FIG. 8 (a) is a cross-sectional view in the longitudinal direction, and FIG. 8 (b) is a cross-section in the short direction.
  • FIG. The plate-like member 50B of this modification has an area of the upper surface 50a facing the end portion 40d of the electrode group 40 larger than the area of the bottom wall 11c of the battery can 11, that is, the lower surface 50b facing the bottom surface of the battery container 10, The surface 50 c is inclined with respect to the winding axis A of the electrode group 40.
  • the plate-like member fixed to the end portion 40 d of the electrode group 40 when the electrode group 40 is inserted into the opening 11 d of the battery can 11.
  • the electrode group 40 can be easily inserted by the outer peripheral surface 50c of the 50.
  • FIG. 9 is a perspective view showing a third modification of the plate-like member 50 of the first embodiment shown in FIG.
  • the plate-like member 50C of this modification is formed in a mesh shape with the same material as the plate-like member 50 of the first embodiment.
  • the electrolytic solution in the battery container 10 reaches the end 40d of the electrode group 40 by the mesh of the plate-like member 50C, and electrolysis with respect to the electrode group 40 is performed. Impregnation of the liquid can be further improved.
  • FIG. 10 is a cross-sectional view of the rectangular secondary battery 100A of the present embodiment corresponding to the XX cross section shown in FIG.
  • the rectangular secondary battery 100 ⁇ / b> A of the present embodiment is attached between the plate member 50 and the bottom wall 11 c of the battery can 11, that is, the bottom surface of the battery container 10, with the plate member 50 facing the end 40 d of the electrode group 40.
  • This is different from the prismatic secondary battery 100 of the first embodiment described above in that the elastic member 80 is provided. Since the other points of the prismatic secondary battery 100 of the present embodiment are the same as those of the prismatic secondary battery 100 of the first embodiment described above, the same portions are denoted by the same reference numerals and description thereof is omitted.
  • the elastic member 80 for example, a spring member such as a leaf spring, a coil spring, and a disc spring, or an elastic body such as styrene butadiene rubber, ethylene propylene rubber, polyethylene sponge, and rubber sponge can be used.
  • the plate-like member 50 is attached to the end 40d of the electrode group 40 by the elastic member 80.
  • the end 40d of the electrode group 40 can be pressed by the plate-like member 50 by being biased toward the plate. Accordingly, it is possible to effectively prevent the winding deviation of the electrode group 40 when the prismatic secondary battery 100A is repeatedly charged and discharged.
  • the prismatic secondary battery of the present invention can be used not only for an in-vehicle battery system applied to a hybrid vehicle using a motor as a drive source, a zero emission electric vehicle, etc., but also for a wider range of uses.
  • a battery system equipped with the prismatic secondary battery of the present invention is a power storage system that charges and stores a battery with electric power generated by solar power generation, wind power generation, etc. regardless of whether it is for home use, business use, or industrial use.
  • the battery system equipped with the rectangular secondary battery of the present invention is used as a power storage system for charging and storing a battery by using nighttime midnight power, or other than on the ground such as a space station, a spacecraft, a space base, etc. It can also be used as a possible power storage system.
  • the battery system equipped with the square secondary battery of the present invention is used for industrial purposes such as medical equipment, construction machinery, power storage systems, elevators, unmanned mobile vehicles, and for mobile objects such as golf carts and turret cars. can do.

Abstract

Provided is a rectangular secondary cell in which winding displacement of an electrode group is prevented without increasing the volume of the cell in the thickness direction. A rectangular secondary cell provided with a flat rectangular cell container and a flat electrode group accommodated in the cell container, the flat electrode group having positive and negative electrodes wound around a winding shaft that is perpendicular to the bottom surface of the cell container. A rigid plate-shaped member having a thickness-direction dimension that is less than the thickness of the electrode group is disposed between the bottom surface of the cell container, and the end part in the winding shaft direction of the electrode group facing the bottom surface.

Description

角形二次電池Prismatic secondary battery
　本発明は、例えば、車載用途等に使用される角形二次電池に関する。 The present invention relates to a prismatic secondary battery used for, for example, in-vehicle use.
　従来から、例えば、電気自動車やハイブリッド電気自動車等の車両に搭載された電気モーター等に電力を供給する車載用電源又はその他の機器の電源として、高エネルギー密度を有するリチウムイオン二次電池等の角形二次電池が用いられている。このような非水電解質電池は、例えば、容器と、該容器内に収容され、正極及び負極の間にセパレータを介して渦巻き状に捲回された電極群と、該容器内に収容された非水電解液を備えている（下記特許文献１を参照）。 Conventionally, for example, an in-vehicle power source that supplies power to an electric motor or the like mounted on a vehicle such as an electric vehicle or a hybrid electric vehicle, or a square shape such as a lithium ion secondary battery having a high energy density as a power source for other devices. Secondary batteries are used. Such a nonaqueous electrolyte battery includes, for example, a container, an electrode group housed in the container, and spirally wound via a separator between a positive electrode and a negative electrode, and a non-aqueous electrolyte housed in the container. A water electrolyte is provided (see Patent Document 1 below).
　特許文献１に記載された非水電解質電池は、放電容量を確保するために正負極及びセパレータの空隙率が低くなり、非水電解液の正負極及びセパレータへの含浸が悪くなることを問題とし、放電容量の向上を目的として以下構成を採用している。非水電解質電池は、電極群の正極又は負極と電気的に接続されたタブと、該電極群を前記タブが接続されている端面と反対側の端面を含むように被覆し、かつ該反対側の端面と対向する箇所以外に粘着剤層を有する絶縁体とを具備している。 The non-aqueous electrolyte battery described in Patent Document 1 has a problem in that the porosity of the positive and negative electrodes and the separator is lowered to ensure the discharge capacity, and the impregnation of the non-aqueous electrolyte into the positive and negative electrodes and the separator is deteriorated. In order to improve the discharge capacity, the following configuration is adopted. The nonaqueous electrolyte battery includes a tab electrically connected to a positive electrode or a negative electrode of an electrode group, and the electrode group so as to include an end surface opposite to an end surface to which the tab is connected, and the opposite side The insulator which has an adhesive layer other than the location which opposes the end surface of this is comprised.
　また、非水電解質二次電池を製造する際に、偏平状捲回電極体に絶縁スペーサ及び絶縁テープを取り付け、正極タブ及び負極タブをそれぞれ所定の形状に曲げた後、偏平状捲回電極体を、長手方向の一端面が開口し、周囲面が閉鎖した角形の金属製の電池外装体内に挿入することが開示されている（下記特許文献２を参照）。 Further, when manufacturing a non-aqueous electrolyte secondary battery, an insulating spacer and an insulating tape are attached to the flat wound electrode body, the positive electrode tab and the negative electrode tab are bent into predetermined shapes, respectively, and then the flat wound electrode body. Is inserted into a rectangular metal battery outer body whose one end surface in the longitudinal direction is open and whose peripheral surface is closed (see Patent Document 2 below).
特開２０１０－７３５８０号公報JP 2010-73580 A 国際公開第２０１２／０９０７２６号International Publication No. 2012/090726
　特許文献１に記載された非水電解質電池は、絶縁体によって電極群のタブが接続されている端面と反対側の端面を含むように被覆することで、電極群と容器との間の絶縁性を確保しつつ、該反対側の端面と対向する箇所以外に粘着剤層を有することで、非水電解液の含浸性を向上させている。しかし、絶縁体によって電極群のタブが接続されている端面と反対側の端面を含むように被覆するには、例えば特許文献１の段落００７３及び００７４に記載されているように、剛性を有しない薄く柔軟なシート状の絶縁体を用いる必要がある。 The nonaqueous electrolyte battery described in Patent Document 1 is coated with an insulator so as to include an end surface opposite to the end surface to which the tab of the electrode group is connected, so that insulation between the electrode group and the container is provided. By ensuring that the adhesive layer is provided in a portion other than the portion facing the opposite end surface, the impregnation property of the non-aqueous electrolyte is improved. However, in order to cover with an insulator so as to include the end face opposite to the end face to which the tab of the electrode group is connected, it does not have rigidity as described in paragraphs 0073 and 0074 of Patent Document 1, for example. It is necessary to use a thin and flexible sheet-like insulator.
　特許文献１に記載された非水電解質電池は、渦巻き状に捲回された電極群を電池外装体の開口に挿入する際の電極群の挿入方向が捲回中心軸に沿う方向である。そのため、電極群を電池外装体に挿入する際や、電極群を電池外装体に挿入した後に、正負極及びセパレータが捲回中心軸に沿って巻きずれを生じ、捲回中心軸方向の端面が所謂筍状に突出する虞がある。このような巻きずれは、剛性を有しない薄く柔軟なシート状の絶縁体によって電極群の端面を含むように被覆しても、防止することができない。 In the nonaqueous electrolyte battery described in Patent Document 1, the insertion direction of the electrode group when the spirally wound electrode group is inserted into the opening of the battery exterior body is a direction along the winding center axis. Therefore, when the electrode group is inserted into the battery outer package, or after the electrode group is inserted into the battery outer package, the positive and negative electrodes and the separator are unwound along the winding central axis, and the end surface in the winding central axis direction is There is a risk of protruding in a so-called bowl shape. Such winding deviation cannot be prevented even if the end face of the electrode group is covered with a thin and flexible sheet-like insulator having no rigidity.
　また、特許文献２に記載された非水電解質二次電池は、偏平捲回電極群の捲回中心軸方向の両端部に絶縁スペーサを取り付けているが、非水電解質二次電池の両端部の全体を絶縁スペーサによって覆っている。そのため、電池の厚さ方向の体積増加を招く。 In addition, the nonaqueous electrolyte secondary battery described in Patent Document 2 has insulating spacers attached to both ends of the flat wound electrode group in the direction of the central axis of the winding, but the nonaqueous electrolyte secondary battery has both ends of the nonaqueous electrolyte secondary battery. The whole is covered with an insulating spacer. Therefore, the volume increase in the thickness direction of the battery is caused.
　本発明は、前記課題に鑑みてなされたものであり、電極群の巻きずれを防止するとともに、電池の厚さ方向の体積増加を招くことのない角形二次電池を提供することを目的とする。 The present invention has been made in view of the above problems, and an object of the present invention is to provide a prismatic secondary battery that prevents an electrode group from being unwound and does not cause an increase in volume in the thickness direction of the battery. .
　前記目的を達成すべく、本発明の角形二次電池は、偏平角形の電池容器と、該電池容器に収容され該電池容器の底面に垂直な捲回軸を中心に正負の電極が捲回された偏平な電極群と、を備えた角形二次電池であって、前記電池容器の前記底面と該底面に対向する前記電極群の前記捲回軸方向の端部との間に前記電極群の厚さよりも該厚さ方向の寸法が小さい剛性を有する板状部材が配置されていることを特徴とする。 In order to achieve the above object, a prismatic secondary battery according to the present invention comprises a flat rectangular battery container, and positive and negative electrodes wound around a winding axis that is accommodated in the battery container and perpendicular to the bottom surface of the battery container. And a flat electrode group, wherein the electrode group is disposed between the bottom surface of the battery container and an end portion of the electrode group facing the bottom surface in the winding axis direction. A plate-like member having rigidity whose dimension in the thickness direction is smaller than the thickness is disposed.
　本発明の角形二次電池によれば、電池容器の底面と該底面に対向する電極群の捲回軸方向の端部との間の板状部材の剛性によって、電極群の巻きずれを防止することができる。また、電極群の厚さ方向の板状部材の寸法が電極群の厚さよりも小さいので、電池の厚さ方向の体積増加を招くことがない。 According to the prismatic secondary battery of the present invention, the displacement of the electrode group is prevented by the rigidity of the plate-like member between the bottom surface of the battery container and the end portion of the electrode group facing the bottom surface in the winding axis direction. be able to. Moreover, since the dimension of the plate-shaped member in the thickness direction of the electrode group is smaller than the thickness of the electrode group, the volume in the thickness direction of the battery is not increased.
本発明の角形二次電池の実施形態１を示す外観斜視図。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an external perspective view showing Embodiment 1 of a prismatic secondary battery of the present invention. 図１に示す角形二次電池の分解斜視図。The disassembled perspective view of the square secondary battery shown in FIG. 図２に示す電極群の分解斜視図。The disassembled perspective view of the electrode group shown in FIG. 図２に示す電極群と板状部材の斜視図。FIG. 3 is a perspective view of an electrode group and a plate member shown in FIG. 2. 図４に示す電極群と板状部材の固定方法の一例を示す拡大側面図。The enlarged side view which shows an example of the fixing method of the electrode group and plate-shaped member which are shown in FIG. 図４に示す電極群と板状部材の固定方法の一例を示す拡大側面図。The enlarged side view which shows an example of the fixing method of the electrode group and plate-shaped member which are shown in FIG. 図４に示す板状部材の変形例１を示す長手方向に沿う断面図。Sectional drawing which follows the longitudinal direction which shows the modification 1 of the plate-shaped member shown in FIG. 図４に示す板状部材の変形例２を示す断面図であり、（ａ）は長手方向に沿う断面図、（ｂ）は短手方向に沿う断面図。It is sectional drawing which shows the modification 2 of the plate-shaped member shown in FIG. 4, (a) is sectional drawing which follows a longitudinal direction, (b) is sectional drawing which follows a transversal direction. 図４に示す板状部材の変形例３を示す斜視図。The perspective view which shows the modification 3 of the plate-shaped member shown in FIG. 本発明の角形二次電池の実施形態２を示す図１に示すＸ－Ｘ断面に相当する矢視断面図。FIG. 6 is a cross-sectional view taken along the line XX shown in FIG. 1 showing Embodiment 2 of the prismatic secondary battery of the present invention.
（実施形態１）
　以下、図面を参照して本発明の角形二次電池の実施形態１を説明する。図１は、本実施形態の角形二次電池１００の外観斜視図である。図２は、図１に示す角形二次電池１００の分解斜視図である。 (Embodiment 1)
Hereinafter, Embodiment 1 of the prismatic secondary battery of the present invention will be described with reference to the drawings. FIG. 1 is an external perspective view of a prismatic secondary battery 100 of the present embodiment. FIG. 2 is an exploded perspective view of the prismatic secondary battery 100 shown in FIG.
　本実施形態の角形二次電池１００は、例えば、偏平角形の電池容器１０を備える角形リチウムイオン二次電池である。電池容器１０は、上部に開口部１１ｄを有する有底角筒状の電池缶１１と、該電池缶１１の開口部１１ｄを封止する長方形板状の電池蓋１２とを有している。電池缶１１は、幅方向に沿う最大面積の広側壁１１ａと、厚さ方向に沿う面積の小さい狭側壁１１ｂと、上部の開口部１１ｄに対向する底壁１１ｃとを有している。電池缶１１及び電池蓋１２は、例えば、アルミニウム又はアルミニウム合金等の金属材料によって製作されている。 The prismatic secondary battery 100 of the present embodiment is, for example, a prismatic lithium ion secondary battery including a flat rectangular battery container 10. The battery container 10 includes a bottomed rectangular tube-shaped battery can 11 having an opening 11d at the top, and a rectangular plate-shaped battery lid 12 that seals the opening 11d of the battery can 11. The battery can 11 has a wide side wall 11a having a maximum area along the width direction, a narrow side wall 11b having a small area along the thickness direction, and a bottom wall 11c facing the upper opening 11d. The battery can 11 and the battery lid 12 are made of a metal material such as aluminum or an aluminum alloy, for example.
　電池蓋１２の長手方向の両端には、電池蓋１２の外側に、正極及び負極の外部端子２０Ａ，２０Ｂが配置されている。正極の外部端子２０Ａは、例えば、アルミニウム又はアルミニウム合金によって製作され、負極の外部端子２０Ｂは、例えば、銅又は銅合金によって製作されている。以下、正極側と負極側を特に区別する必要がない場合には、正極及び負極の外部端子２０Ａ，２０Ｂを一括して外部端子２０と表記する。 At both ends of the battery lid 12 in the longitudinal direction, positive and negative external terminals 20A and 20B are arranged outside the battery lid 12. The positive external terminal 20A is made of, for example, aluminum or an aluminum alloy, and the negative external terminal 20B is made of, for example, copper or a copper alloy. Hereinafter, when there is no need to particularly distinguish the positive electrode side and the negative electrode side, the external terminals 20A and 20B of the positive electrode and the negative electrode are collectively referred to as the external terminal 20.
　電池蓋１２は、外部端子２０が配置される両端部に貫通孔１２ａを有している。貫通孔１２ａの周囲で、外部端子２０と電池蓋１２との間には、ガスケット２が配置されている。ガスケット２は、外部端子２０と電池蓋１２とを電気的に絶縁するとともに、外部端子２０と電池蓋１２との間で圧縮されてこれらに密着し、電池蓋１２の貫通孔１２ａを封止している。ガスケット２は、例えばポリブチレンテレフタレートやポリフェニレンサルファイド、ペルフルオロアルコキシフッ素樹脂等の絶縁性を有する樹脂材料によって製作されている。 The battery lid 12 has through holes 12a at both ends where the external terminals 20 are disposed. The gasket 2 is disposed between the external terminal 20 and the battery lid 12 around the through hole 12a. The gasket 2 electrically insulates the external terminal 20 and the battery cover 12 and is compressed between the external terminal 20 and the battery cover 12 so as to be in close contact therewith, thereby sealing the through hole 12a of the battery cover 12. ing. The gasket 2 is made of an insulating resin material such as polybutylene terephthalate, polyphenylene sulfide, or perfluoroalkoxy fluororesin.
　電池蓋１２の貫通孔１２ａの間には、ガス排出弁１３と注液口１４とが設けられている。ガス排出弁１３は、例えば、電池蓋１２を薄肉化して溝部１３ａを形成することによって設けられ、電池容器１０の内部の圧力が所定値を超えて上昇した時に開裂して内部のガスを放出することで、電池容器１０の内部の圧力を低下させる。注液口１４は、電池容器１０の内部に電解液を注入するのに用いられ、例えばレーザ溶接によって注液栓１５が溶接されて封止されている。 Between the through hole 12a of the battery lid 12, a gas discharge valve 13 and a liquid injection port 14 are provided. The gas discharge valve 13 is provided, for example, by thinning the battery lid 12 to form a groove 13a, and is cleaved to release the internal gas when the internal pressure of the battery container 10 exceeds a predetermined value. As a result, the pressure inside the battery container 10 is reduced. The liquid injection port 14 is used for injecting an electrolytic solution into the battery container 10, and the liquid injection plug 15 is welded and sealed by laser welding, for example.
　外部端子２０は、バスバー等に溶接接合される溶接接合部２１を有している。溶接接合部２１は、概ね直方体形状を有するブロック状に形成され、下端面が電池蓋１２の上面に対向し、上端面が電池蓋１２の上面と平行になっている。溶接接合部２１の下端面には、電池蓋１２の上面に垂直な方向に延びる柱状の接続部２２が設けられている。 The external terminal 20 has a weld joint 21 that is welded to a bus bar or the like. The welded joint portion 21 is formed in a block shape having a substantially rectangular parallelepiped shape, the lower end surface faces the upper surface of the battery lid 12, and the upper end surface is parallel to the upper surface of the battery lid 12. A columnar connection portion 22 extending in a direction perpendicular to the upper surface of the battery lid 12 is provided on the lower end surface of the weld joint portion 21.
　正負の集電板３０Ａ，３０Ｂは、それぞれ、電池蓋１２の下面に対向して配置される矩形板状の基部３１と、基部３１の側端で折曲されて電池缶１１の広側壁１１ａに沿って底壁１１ｃに向かって延びる端子部３２とを有している。正負の集電板３０Ａ，３０Ｂは、それぞれの端子部３２が、例えば、超音波圧接又は抵抗溶接等によって電極群４０のタブ部４１ｃ，４２ｃに接合されることで、電極群４０に電気的に接続されるとともに、電池容器１０内で電極群４０を支持している。 The positive and negative current collecting plates 30 </ b> A and 30 </ b> B are respectively bent at the rectangular plate-like base portion 31 disposed opposite to the lower surface of the battery lid 12 and the side end of the base portion 31, and are formed on the wide side wall 11 a of the battery can 11. And a terminal portion 32 extending toward the bottom wall 11c. The positive and negative current collecting plates 30A and 30B are electrically connected to the electrode group 40 by joining the terminal portions 32 to the tab portions 41c and 42c of the electrode group 40 by, for example, ultrasonic welding or resistance welding. The electrode group 40 is supported in the battery container 10 while being connected.
　正極の集電板３０Ａは、例えば、アルミニウム又はアルミニウム合金によって製作され、負極の集電板３０Ｂは、例えば銅又は銅合金によって製作されている。以下、正極及び負極の集電板３０Ａ，３０Ｂを特に区別する必要がない場合には、正負の集電板３０Ａ，３０Ｂを一括して集電板３０と表記する。集電板３０の基部３１と電池蓋１２との間には絶縁板３が配置され、電池蓋１２と集電板３０とが電気的に絶縁されている。絶縁板３は、例えば、ガスケット２と同様の絶縁性を有する樹脂材料によって製作されている。 The positive current collecting plate 30A is made of, for example, aluminum or an aluminum alloy, and the negative current collecting plate 30B is made of, for example, copper or a copper alloy. Hereinafter, when there is no need to particularly distinguish the positive and negative current collecting plates 30A and 30B, the positive and negative current collecting plates 30A and 30B are collectively referred to as the current collecting plate 30. The insulating plate 3 is disposed between the base 31 of the current collecting plate 30 and the battery lid 12, and the battery lid 12 and the current collecting plate 30 are electrically insulated. The insulating plate 3 is made of, for example, a resin material having insulation similar to that of the gasket 2.
　外部端子２０、ガスケット２、絶縁板３及び集電板３０は、電池蓋１２にかしめ固定されている。具体的には、ガスケット２の貫通孔２ａ、電池蓋１２の貫通孔１２ａ、絶縁板３の貫通孔３ａ、及び集電板３０の基部３１の貫通孔３１ａに、外部端子２０の接続部２２を挿通させた後、接続部２２の先端を塑性変形させて拡径し、かしめ部２２ｃを形成する。これにより、外部端子２０、ガスケット２、絶縁板３及び集電板３０が電池蓋１２にかしめ固定され、正負の外部端子２０Ａ，２０Ｂがそれぞれ正負の集電板３０Ａ，３０Ｂに接続される。 External terminal 20, gasket 2, insulating plate 3, and current collector plate 30 are caulked and fixed to battery lid 12. Specifically, the connecting portion 22 of the external terminal 20 is inserted into the through hole 2 a of the gasket 2, the through hole 12 a of the battery cover 12, the through hole 3 a of the insulating plate 3, and the through hole 31 a of the base 31 of the current collector plate 30. After the insertion, the tip of the connecting portion 22 is plastically deformed to expand the diameter, thereby forming the caulking portion 22c. Thereby, the external terminal 20, the gasket 2, the insulating plate 3, and the current collecting plate 30 are caulked and fixed to the battery lid 12, and the positive and negative external terminals 20A and 20B are connected to the positive and negative current collecting plates 30A and 30B, respectively.
　図３は、図２に示す電極群４０の一部を展開した分解斜視図である。電極群４０は、正負の電極４１，４２が捲回の中心軸すなわち捲回軸Ａを中心に捲回された偏平な捲回電極群である。より詳細には、電極群４０は、セパレータ４３，４４を介在させて積層させた正負の電極４１，４２を、捲回軸Ａに平行な軸芯の周りに捲回して偏平な形状に成形した捲回電極群である。セパレータ４３，４４は、例えば、ポリエチレン樹脂やポリプロピレン樹脂を引き延ばして製作された多孔質の樹脂シートであり、正極電極４１と負極電極４２との間を絶縁している。 FIG. 3 is an exploded perspective view in which a part of the electrode group 40 shown in FIG. 2 is developed. The electrode group 40 is a flat wound electrode group in which positive and negative electrodes 41 and 42 are wound around a central axis of winding, that is, a winding axis A. More specifically, the electrode group 40 is formed into a flat shape by winding the positive and negative electrodes 41 and 42 laminated with the separators 43 and 44 interposed therebetween around an axis parallel to the winding axis A. This is a wound electrode group. The separators 43 and 44 are, for example, porous resin sheets manufactured by stretching a polyethylene resin or a polypropylene resin, and insulate the positive electrode 41 and the negative electrode 42 from each other.
　電極群４０は、例えば、以下の手順で製作することができる。まず、図示しない軸芯に、セパレータ４３，４４の各々の捲回の始端部を溶着し、セパレータ４３，４４と正負の電極４１，４２とを交互に重ねて捲回する。このとき、正極電極４１の始端部を負極電極４２の始端部よりも軸芯側に配置して捲回する。これにより、捲回後の電極群４０において、正極電極４１の捲回の始端部は、負極電極４２の捲回の始端部よりも軸芯側に位置している。 The electrode group 40 can be manufactured by the following procedure, for example. First, the winding start ends of the separators 43 and 44 are welded to a shaft core (not shown), and the separators 43 and 44 and the positive and negative electrodes 41 and 42 are alternately overlapped and wound. At this time, the starting end portion of the positive electrode 41 is arranged closer to the axial center side than the starting end portion of the negative electrode 42 and wound. Thereby, in the electrode group 40 after winding, the winding start end portion of the positive electrode 41 is positioned closer to the axial center side than the winding start end portion of the negative electrode 42.
　セパレータ４４は、電極群４０と電池容器１０等との絶縁を考慮して、負極電極４２の捲回終了後に電極群４０の周囲に一周以上多く捲回されることで電極群４０の最外周に捲回され、捲回の終端部が、例えば、巻緩み防止用の粘着テープ等によって固定される。粘着テープの幅、長さ、厚さは特に限定されず、例えば、電極群の外周全体を覆ってもよい。 In consideration of insulation between the electrode group 40 and the battery case 10, the separator 44 is wound around the electrode group 40 more than once around the electrode group 40 after the negative electrode 42 has been wound. The wound end is fixed by, for example, an adhesive tape for preventing winding looseness. The width, length, and thickness of the adhesive tape are not particularly limited, and for example, the entire outer periphery of the electrode group may be covered.
　正極電極４１は、正極集電体である正極箔４１ａと、正極箔４１ａの両面に塗布された正極活物質合剤からなる正極合剤層４１ｂとを有している。長尺帯状の正極電極４１の幅方向の一側は、正極合剤層４１ｂが形成されず、正極箔４１ａが露出した集電体露出部とされ、集電体露出部が切り欠かれて複数のタブ部４１ｃが形成されている。タブ部４１ｃは、正極電極４１の幅方向に突出し、セパレータ４３，４４の幅方向の端部から突出している。正極電極４１の複数のタブ部４１ｃは、電極群４０の捲回後に、正極集電板３０Ａの端子部３２に対応する位置で一括して束ねられるように、タブ部４１ｃ同士の間隔が調整されている。 The positive electrode 41 has a positive electrode foil 41a that is a positive electrode current collector, and a positive electrode mixture layer 41b made of a positive electrode active material mixture applied to both surfaces of the positive electrode foil 41a. One side in the width direction of the elongated positive electrode 41 is a current collector exposed portion where the positive electrode mixture layer 41b is not formed and the positive foil 41a is exposed, and the current collector exposed portion is cut out to form a plurality. The tab portion 41c is formed. The tab portion 41 c protrudes in the width direction of the positive electrode 41 and protrudes from end portions in the width direction of the separators 43 and 44. The spacing between the tab portions 41c is adjusted so that the plurality of tab portions 41c of the positive electrode 41 are bundled together at a position corresponding to the terminal portion 32 of the positive current collector plate 30A after the electrode group 40 is wound. ing.
　正極電極４１は、例えば、正極活物質に導電材、結着剤及び分散溶媒を添加して混練した正極活物質合剤を、幅方向の一側を除いて正極箔４１ａの両面に塗布し、乾燥、プレス、裁断することによって製作することができる。正極箔４１ａとしては、例えば、厚さ約１５μｍのアルミニウム箔を用いることができる。正極箔４１ａの厚みを含まない正極合剤層４１ｂの厚さは、例えば、約７０μｍである。 The positive electrode 41, for example, a positive electrode active material mixture kneaded by adding a conductive material, a binder and a dispersion solvent to the positive electrode active material, is applied to both surfaces of the positive electrode foil 41a except for one side in the width direction, It can be produced by drying, pressing and cutting. As the positive electrode foil 41a, for example, an aluminum foil having a thickness of about 15 μm can be used. The thickness of the positive electrode mixture layer 41b not including the thickness of the positive electrode foil 41a is, for example, about 70 μm.
　正極活物質合剤の材料としては、例えば、正極活物質として１００重量部のマンガン酸リチウム（化学式ＬｉＭｎ２Ｏ４）を、導電材として１０重量部の鱗片状黒鉛を、結着剤として１０重量部のポリフッ化ビニリデン（以下、ＰＶＤＦという。）を、分散溶媒としてＮ－メチルピロリドン（以下、ＮＭＰという。）を、それぞれ用いることができる。正極活物質は、前記したマンガン酸リチウムに限定されず、例えば、スピネル結晶構造を有する他のマンガン酸リチウム、一部を金属元素で置換又はドープしたリチウムマンガン複合酸化物を用いてもよい。また、正極活物質として、層状結晶構造を有するコバルト酸リチウムやチタン酸リチウム、及びこれらの一部を金属元素で置換又はドープしたリチウム－金属複合酸化物を用いてもよい。 As a material of the positive electrode active material mixture, for example, 100 parts by weight of lithium manganate (chemical formula LiMn 2 O 4 ) is used as the positive electrode active material, 10 parts by weight of flaky graphite as the conductive material, and 10% by weight as the binder. Part of polyvinylidene fluoride (hereinafter referred to as PVDF) and N-methylpyrrolidone (hereinafter referred to as NMP) can be used as a dispersion solvent. The positive electrode active material is not limited to the above-described lithium manganate. For example, another lithium manganate having a spinel crystal structure, or a lithium manganese composite oxide partially substituted or doped with a metal element may be used. Further, as the positive electrode active material, lithium cobalt oxide or lithium titanate having a layered crystal structure, or a lithium-metal composite oxide in which a part thereof is substituted or doped with a metal element may be used.
　負極電極４２は、負極集電体である負極箔４２ａと、負極箔４２ａの両面に塗布された負極活物質合剤からなる負極合剤層４２ｂとを有している。負極電極４２の幅方向の一側は、負極合剤層４２ｂが形成されず、負極箔４２ａが露出した集電体露出部とされ、集電体露出部が切り欠かれてタブ部４２ｃが形成されている。タブ部４２ｃは、負極電極４２の幅方向に突出し、セパレータ４３，４４の幅方向の端部から突出している。負極電極４２の複数のタブ部４２ｃは、電極群４０の捲回後に、負極集電板３０Ｂの端子部３２に対応する位置で一括して束ねられるように、タブ部４２ｃ同士の間隔が調整されている。 The negative electrode 42 has a negative electrode foil 42a which is a negative electrode current collector, and a negative electrode mixture layer 42b made of a negative electrode active material mixture coated on both surfaces of the negative electrode foil 42a. The negative electrode mixture layer 42b is not formed on one side in the width direction of the negative electrode 42, and a current collector exposed portion where the negative electrode foil 42a is exposed is formed, and the current collector exposed portion is cut away to form a tab portion 42c. Has been. The tab portion 42 c protrudes in the width direction of the negative electrode 42 and protrudes from the end portions in the width direction of the separators 43 and 44. The spacing between the tab portions 42c is adjusted so that the plurality of tab portions 42c of the negative electrode 42 are bundled together at a position corresponding to the terminal portion 32 of the negative electrode current collector plate 30B after the electrode group 40 is wound. ing.
　負極電極４２は、例えば、負極活物質に結着剤及び分散溶媒を添加して混練した負極活物質合剤を、幅方向の一側を除く負極箔４２ａの両面に塗布し、乾燥、プレス、裁断することによって製作することができる。負極箔４２ａとしては、例えば、厚さ約１０μｍの銅箔を用いることができる。負極箔４２ａの厚みを含まない負極合剤層４２ｂの厚さは、例えば、約４０μｍである。 For example, the negative electrode 42 is prepared by applying a negative electrode active material mixture kneaded by adding a binder and a dispersion solvent to the negative electrode active material on both sides of the negative electrode foil 42a except for one side in the width direction, drying, pressing, It can be produced by cutting. As the negative electrode foil 42a, for example, a copper foil having a thickness of about 10 μm can be used. The thickness of the negative electrode mixture layer 42b not including the thickness of the negative electrode foil 42a is, for example, about 40 μm.
　負極活物質合剤の材料としては、例えば、負極活物質として１００重量部の非晶質炭素粉末を、結着剤として１０重量部のＰＶＤＦを、分散溶媒としてＮＭＰをそれぞれ用いることができる。負極活物質は、前記した非晶質炭素に限定されず、リチウムイオンを挿入、脱離可能な天然黒鉛や、人造の各種黒鉛材、コークスなどの炭素質材料やＳｉやＳｎなどの化合物（例えば、ＳｉＯ、ＴｉＳｉ２等）、又はそれらの複合材料を用いてもよい。負極活物質の粒子形状についても特に限定されず、鱗片状、球状、繊維状又は塊状等の粒子形状を適宜選択することができる。 As a material for the negative electrode active material mixture, for example, 100 parts by weight of amorphous carbon powder as the negative electrode active material, 10 parts by weight of PVDF as the binder, and NMP as the dispersion solvent can be used. The negative electrode active material is not limited to the above-mentioned amorphous carbon, and natural graphite capable of inserting and removing lithium ions, various artificial graphite materials, carbonaceous materials such as coke, and compounds such as Si and Sn (for example, , SiO, TiSi 2 or the like), or a composite material thereof. The particle shape of the negative electrode active material is not particularly limited, and a particle shape such as a scale shape, a spherical shape, a fiber shape, or a lump shape can be appropriately selected.
　なお、前記した正極及び負極の合剤層４１ｂ，４２ｂに用いる結着材は、ＰＶＤＦに限定されない。前記した結着材として、例えば、ポリテトラフルオロエチレン（ＰＴＦＥ）、ポリエチレン、ポリスチレン、ポリブタジエン、ブチルゴム、ニトリルゴム、スチレンブタジエンゴム、多硫化ゴム、ニトロセルロース、シアノエチルセルロース、各種ラテックス、アクリロニトリル、フッ化ビニル、フッ化ビニリデン、フッ化プロピレン、フッ化クロロプレン、アクリル系樹脂などの重合体及びこれらの混合体などを用いてもよい。 The binder used for the positive electrode and negative electrode mixture layers 41b and 42b is not limited to PVDF. Examples of the binder include polytetrafluoroethylene (PTFE), polyethylene, polystyrene, polybutadiene, butyl rubber, nitrile rubber, styrene butadiene rubber, polysulfide rubber, nitrocellulose, cyanoethyl cellulose, various latexes, acrylonitrile, and vinyl fluoride. Polymers such as vinylidene fluoride, propylene fluoride, chloroprene fluoride, and acrylic resins, and mixtures thereof may be used.
　また、セパレータ４３，４４を介在させて正極電極４１及び負極電極４２を重ねて捲回する際の軸芯は、例えば、正極箔４１ａ、負極箔４２ａ、セパレータ４３，４４のいずれよりも曲げ剛性の高い樹脂シートを捲回したものを用いることができる。 In addition, the axial core when winding the positive electrode 41 and the negative electrode 42 with the separators 43 and 44 interposed therebetween is, for example, more flexible than the positive foil 41a, the negative foil 42a, and the separators 43 and 44. A roll of a high resin sheet can be used.
　電極群４０の捲回軸Ａ方向において、負極電極４２の負極合剤層４２ｂの幅は、正極電極４１の正極合剤層４１ｂの幅よりも広くなっている。また、電極群４０の最内周と最外周には負極電極４２が捲回されている。これにより、正極合剤層４１ｂは、電極群４０の最内周から最外周まで負極合剤層４２ｂの間に挟まれている。 In the winding axis A direction of the electrode group 40, the width of the negative electrode mixture layer 42b of the negative electrode 42 is wider than the width of the positive electrode mixture layer 41b of the positive electrode 41. A negative electrode 42 is wound around the innermost and outermost circumferences of the electrode group 40. Thus, the positive electrode mixture layer 41b is sandwiched between the negative electrode mixture layer 42b from the innermost periphery to the outermost periphery of the electrode group 40.
　また、電極群４０の捲回軸Ａ方向において、タブ部４１ｃ，４２ｃが形成された端部４０ｃと反対側の電池缶１１の底壁１１ｃに対向する端部４０ｄでは、負極電極４２の端部が最も外側に配置されている。さらに、電極群４０の捲回軸Ａ方向において、負極電極４２の端部の内側に、例えば２ｍｍ以下の間隔をあけてセパレータ４３，４４の端部が配置され、セパレータ４３，４４の端部の内側に、例えば２ｍｍ以上かつ４ｍｍ以下の間隔をあけて正極電極４１の端部が配置されている。したがって、本実施形態では、電極群４０の捲回軸Ａ方向において、電池缶１１の底壁１１ｃに対向する端部４０ｄに、捲回された負極電極４２の端部によって電池缶１１の底壁１１ｃに対向する端面が形成されている。 Further, in the winding axis A direction of the electrode group 40, the end portion of the negative electrode 42 is at the end portion 40d facing the bottom wall 11c of the battery can 11 opposite to the end portion 40c where the tab portions 41c and 42c are formed. Is arranged on the outermost side. Furthermore, in the winding axis A direction of the electrode group 40, the end portions of the separators 43 and 44 are arranged inside the end portion of the negative electrode 42 with an interval of 2 mm or less, for example. The end of the positive electrode 41 is disposed on the inner side with an interval of, for example, 2 mm or more and 4 mm or less. Therefore, in the present embodiment, in the winding axis A direction of the electrode group 40, the end wall of the negative electrode 42 wound on the end portion 40 d facing the bottom wall 11 c of the battery can 11 has the bottom wall of the battery can 11. An end surface facing 11c is formed.
　図４は、図２に示す電極群４０と板状部材５０の斜視図である。板状部材５０は、例えば、ポリエチレン、ＰＴＦＥ、塩化ビニル等の樹脂材料、又は、ＦＲＰ、ＧＦＲＰ等の繊維強化プラスチック樹脂によって製作された絶縁性を有する板状の部材である。板状部材５０は、電極群４０の端部４０ｄすなわち負極電極４２の端部によって形成された端面を支持又は押圧することが可能な剛性を有している。換言すると、本実施形態の板状部材５０は、電極群４０を電池缶１１に挿入する際、又は、電極群４０が電池容器１０内で膨張及び収縮を繰り返した際に、電極群４０の端部４０ｄから作用する力に抗して、電極群４０の端部４０ｄの形状を維持して巻緩みを防止することが可能な剛性を有している。 FIG. 4 is a perspective view of the electrode group 40 and the plate-like member 50 shown in FIG. The plate-like member 50 is an insulating plate-like member made of, for example, a resin material such as polyethylene, PTFE, or vinyl chloride, or a fiber reinforced plastic resin such as FRP or GFRP. The plate-like member 50 has rigidity capable of supporting or pressing the end face formed by the end portion 40 d of the electrode group 40, that is, the end portion of the negative electrode 42. In other words, the plate-like member 50 of the present embodiment has an end of the electrode group 40 when the electrode group 40 is inserted into the battery can 11 or when the electrode group 40 repeatedly expands and contracts in the battery container 10. Resisting against the force acting from the portion 40d, the shape of the end portion 40d of the electrode group 40 can be maintained to prevent the loosening of the winding.
　前記した板状部材５０の剛性は、前記の材料によって製作した板状部材５０の厚さＴ５０を、例えば、０．８ｍｍ以上にすることで得ることができる。なお、板状部材５０のたわみは、ヤング率、断面二次モーメント、電極群４０の端部４０ｄから作用する荷重によって変化する。したがって、板状部材５０の厚さＴ５０は、板状部材５０のたわみを考慮して、前記した剛性を有する範囲で適宜変更することができる。 The rigidity of the plate-like member 50 described above can be obtained by setting the thickness T 50 of the plate-like member 50 made of the above material to, for example, 0.8 mm or more. Note that the deflection of the plate-like member 50 varies depending on the Young's modulus, the secondary moment of section, and the load acting from the end 40 d of the electrode group 40. Therefore, the thickness T 50 of the plate-like member 50 can be appropriately changed within the range having the above-described rigidity in consideration of the deflection of the plate-like member 50.
　板状部材５０は、電池缶１１の底壁１１ｃすなわち電池容器１０の底面と、該底面に対向する電極群４０の捲回軸Ａ方向の端部４０ｄとの間に配置される。板状部材５０は、電極群４０の端部４０ｄに当接する平坦な上面５０ａと、電池缶１１の底壁１１ｃと対向する平坦な下面５０ｂとを有している。電極群４０の幅Ｗ４０方向における板状部材５０の寸法Ｗ５０は、電極群４０の幅Ｗ４０以下であり、電極群４０の幅Ｗ４０よりも小さいことが好ましい。板状部材５０の長手方向の両端部は、電極群４０の幅Ｗ４０方向の両端部に形成された湾曲部４０ｂの形状に対応する曲面状に形成されている。 The plate-like member 50 is disposed between the bottom wall 11c of the battery can 11, that is, the bottom surface of the battery case 10, and the end 40d in the winding axis A direction of the electrode group 40 facing the bottom surface. The plate-like member 50 has a flat upper surface 50 a that contacts the end portion 40 d of the electrode group 40 and a flat lower surface 50 b that faces the bottom wall 11 c of the battery can 11. Dimension W 50 of the plate-like member 50 in the width W 40 direction of the electrode group 40 is the width W 40 of the electrode assembly 40 or less, it is preferably smaller than the width W 40 of the electrode assembly 40. Both end portions in the longitudinal direction of the plate-like member 50 are formed in curved shapes corresponding to the shapes of the curved portions 40 b formed at both end portions in the width W 40 direction of the electrode group 40.
　また、偏平な電極群４０の厚さＴ４０方向における板状部材５０の寸法Ｄ５０は、電極群４０の厚さＴ４０よりも小さくなっている。ここで、電極群４０の厚さＴ４０は、電極群４０を一対の平行な面Ｐ１，Ｐ２の間で、例えば５０Ｎ以上１００Ｎ以下の圧縮力で圧縮したときの面Ｐ１，Ｐ２間の間隔と定義することができる。なお、面Ｐ１，Ｐ２の面積は、電極群４０の平坦部４０ａの面積よりも大きいものとする。 The dimensional D 50 of the plate-like member 50 in the thickness T 40 direction of the flat electrode group 40 is smaller than the thickness T 40 of the electrode group 40. Here, the thickness T40 of the electrode group 40 is the distance between the surfaces P1 and P2 when the electrode group 40 is compressed between a pair of parallel surfaces P1 and P2, for example, with a compressive force of 50N or more and 100N or less. Can be defined. The areas of the surfaces P1 and P2 are assumed to be larger than the area of the flat portion 40a of the electrode group 40.
　図５及び図６は、電極群４０の端部４０ｄに対する板状部材５０の固定方法の例を示す拡大側面図である。 5 and 6 are enlarged side views showing an example of a method for fixing the plate-like member 50 to the end portion 40d of the electrode group 40. FIG.
　図５に示すように、板状部材５０は、接着層６０を介して電極群４０の端部４０ｄに固定することができる。接着層６０としては、例えば、エポキシ系樹脂やアクリル系樹脂を使用することができる。また、図６に示すように、板状部材５０は、粘着テープ７０を用いて電極群４０の端部４０ｄに固定することができる。なお、粘着テープ７０は、電極群４０の厚さＴ４０方向に突出するが、粘着テープ７０の厚さは板状部材５０の厚さＴ５０と比較して非常に薄いため、電極群４０の容量低下に対する影響は殆どない。 As shown in FIG. 5, the plate-like member 50 can be fixed to the end portion 40 d of the electrode group 40 via the adhesive layer 60. As the adhesive layer 60, for example, an epoxy resin or an acrylic resin can be used. Further, as shown in FIG. 6, the plate-like member 50 can be fixed to the end portion 40 d of the electrode group 40 using an adhesive tape 70. The adhesive tape 70 protrudes in the direction of the thickness T 40 of the electrode group 40, but the thickness of the adhesive tape 70 is very thin compared to the thickness T 50 of the plate-like member 50, so There is almost no effect on capacity reduction.
　電極群４０は、図２に示すように、正負の電極４１，４２のタブ部４１ｃ，４２ｃが、例えば、超音波圧接又は抵抗溶接等によって、それぞれ、正負の集電板３０Ａ，３０Ｂの端子部３２に接合される。これにより、電極群４０は、集電板３０を介して外部端子２０と電気的に接続されるとともに、絶縁板３を介して電池蓋１２に固定される。なお、電極群４０の捲回軸Ａ方向において、セパレータ４３，４４の幅は負極合剤層４２ｂの幅よりも広いが、正極電極４１及び負極電極４２のタブ部４１ｃ，４２ｃは、それぞれセパレータ４３，４４の幅方向端部よりも幅方向外側に突出している。したがって、セパレータ４３，４４は、タブ部４１ｃ，４２ｃを束ねて溶接する際の支障にはならない。 As shown in FIG. 2, in the electrode group 40, the tab portions 41c and 42c of the positive and negative electrodes 41 and 42 are connected to the terminal portions of the positive and negative current collector plates 30A and 30B, respectively, by ultrasonic welding or resistance welding, for example. 32. Thus, the electrode group 40 is electrically connected to the external terminal 20 via the current collector plate 30 and is fixed to the battery lid 12 via the insulating plate 3. In addition, in the winding axis A direction of the electrode group 40, the width of the separators 43 and 44 is wider than the width of the negative electrode mixture layer 42b, but the tab portions 41c and 42c of the positive electrode 41 and the negative electrode 42 are respectively separated from the separator 43. , 44 protrudes outward in the width direction from the end in the width direction. Therefore, the separators 43 and 44 do not hinder the tab portions 41c and 42c from being bundled and welded.
　電極群４０及び板状部材５０は、電池蓋１２にかしめ固定された集電板３０に接合されて支持された状態で、例えば、ポリプロピレン等の合成樹脂製の絶縁保護フィルム４によって覆われて、電池缶１１と電気的に絶縁され、電池缶１１の開口部１１ｄから電池缶１１内部に挿入される。なお、板状部材５０の下面５０ｂは、絶縁保護フィルム４によって覆われていなくてもよい。その後、例えば、レーザ溶接によって、電池蓋１２を電池缶１１の開口部１１ｄの全周に亘って溶接し、電池缶１１の開口部１１ｄを電池蓋１２によって封止することで、電池容器１０が構成される。 The electrode group 40 and the plate-like member 50 are covered and covered with an insulating protective film 4 made of synthetic resin such as polypropylene, for example, in a state where the electrode group 40 and the plate-like member 50 are joined and supported by a current collector plate 30 that is caulked and fixed to the battery lid 12. The battery can 11 is electrically insulated from the battery can 11 and inserted into the battery can 11 through the opening 11 d of the battery can 11. Note that the lower surface 50 b of the plate-like member 50 may not be covered with the insulating protective film 4. Thereafter, for example, the battery lid 12 is welded over the entire circumference of the opening 11d of the battery can 11 by laser welding, and the opening 11d of the battery can 11 is sealed with the battery lid 12, so that the battery container 10 is Composed.
　その後、電池蓋１２の注液口１４を介して電池容器１０の内部に非水電解液を注入し、例えば、レーザ溶接によって注液栓１５を注液口１４に接合して封止することで、電池容器１０が密閉される。電解液の内部に注入する非水電解液としては、例えば、エチレンカーボネートとジメチルカーボネートとを体積比で１：２の割合で混合した混合溶液中に、六フッ化リン酸リチウム（ＬｉＰＦ６）を１モル／リットルの濃度で溶解したものを用いることができる。 Thereafter, a non-aqueous electrolyte is injected into the battery container 10 through the liquid injection port 14 of the battery lid 12 and, for example, the liquid injection plug 15 is joined to the liquid injection port 14 by laser welding and sealed. The battery container 10 is sealed. As the non-aqueous electrolyte to be injected into the electrolyte, for example, lithium hexafluorophosphate (LiPF 6 ) is mixed in a mixed solution in which ethylene carbonate and dimethyl carbonate are mixed at a volume ratio of 1: 2. Those dissolved at a concentration of 1 mol / liter can be used.
　以上の構成により、本実施形態の角形二次電池１００は、発電機等から供給された電力を、外部端子２０及び集電板３０を介して電極群４０に蓄積し、電極群４０に蓄積した電力を、集電板３０及び外部端子２０を介して外部のモーター等に供給する。 With the above configuration, the prismatic secondary battery 100 of the present embodiment accumulates the power supplied from the generator or the like in the electrode group 40 via the external terminal 20 and the current collector plate 30 and accumulates in the electrode group 40. Electric power is supplied to an external motor or the like via the current collector plate 30 and the external terminal 20.
　以下、本実施形態の角形二次電池１００の作用について説明する。 Hereinafter, the operation of the prismatic secondary battery 100 of the present embodiment will be described.
　本実施形態の角形二次電池１００は、電池缶１１の底壁１１ｃすなわち電池容器１０の底面と、該底面に対向する電極群４０の捲回軸Ａ方向の端部４０ｄとの間に剛性を有する板状部材５０が配置されている。これにより、例えば、電極群４０を電池缶１１の開口部１１ｄに挿入する際に、電極群４０の端部４０ｄを板状部材５０によって支持し、電極群４０に巻きずれが生じるのを防止することができる。また、角形二次電池１００の充放電に伴って、電極群４０が膨張及び収縮を繰り返した際に、電極群４０の端部４０ｄを板状部材５０によって支持し、電極群４０に巻きずれが生じるのを防止することができる。 The prismatic secondary battery 100 of the present embodiment has rigidity between the bottom wall 11c of the battery can 11, that is, the bottom surface of the battery container 10, and the end portion 40d of the electrode group 40 facing the bottom surface in the winding axis A direction. A plate-like member 50 is disposed. Thereby, for example, when the electrode group 40 is inserted into the opening 11 d of the battery can 11, the end 40 d of the electrode group 40 is supported by the plate-like member 50, thereby preventing the electrode group 40 from being unwound. be able to. Further, when the electrode group 40 repeatedly expands and contracts as the prismatic secondary battery 100 is charged and discharged, the end portion 40d of the electrode group 40 is supported by the plate-like member 50, and the electrode group 40 is unwound. It can be prevented from occurring.
　また、板状部材５０は、電極群４０の厚さＴ４０よりも該厚さＴ４０方向の寸法Ｄ５０が小さい。これにより、角形二次電池１００の厚さ方向の体積増加を招くことがない。したがって、電池缶１１の広側壁１１ａと電極群４０の平坦部４０ａとの間に無駄な空間が生じるのを防止して、電極群４０の正負の電極４１，４２の捲回数及び厚みを増加させ、角形二次電池１００の容量を増加させることが可能になる。 Further, the plate-like member 50 has a dimension D 50 in the thickness T 40 direction smaller than the thickness T 40 of the electrode group 40. Thereby, the volume increase in the thickness direction of the prismatic secondary battery 100 is not caused. Accordingly, it is possible to prevent a useless space from being generated between the wide side wall 11a of the battery can 11 and the flat portion 40a of the electrode group 40, and to increase the number and thickness of the positive and negative electrodes 41 and 42 of the electrode group 40. The capacity of the square secondary battery 100 can be increased.
　また、板状部材５０が接着層６０を介して電極群４０の端部４０ｄに固定されている場合には、電極群４０を電池缶１１の開口部１１ｄに挿入する際に、板状部材５０と電極群４０との位置ずれを防止することができる。また、接着層６０によって板状部材５０と電極群４０の端部との間の衝撃を緩和することができる。 When the plate member 50 is fixed to the end portion 40 d of the electrode group 40 via the adhesive layer 60, the plate member 50 is inserted when the electrode group 40 is inserted into the opening portion 11 d of the battery can 11. And displacement of the electrode group 40 can be prevented. In addition, the impact between the plate-like member 50 and the end portion of the electrode group 40 can be reduced by the adhesive layer 60.
　また、板状部材５０が粘着テープ７０によって電極群４０の端部４０ｄに固定されている場合にも、同様に、電極群４０を電池缶１１の開口部１１ｄに挿入する際に、板状部材５０と電極群４０との位置ずれを防止することができる。また、板状部材５０と電極群４０との間の電解液の流通が阻害されず、電極群４０の端部４０ｄから電解液を含浸させやすくすることができる。 Similarly, when the plate-like member 50 is fixed to the end 40 d of the electrode group 40 by the adhesive tape 70, the plate-like member is similarly inserted when the electrode group 40 is inserted into the opening 11 d of the battery can 11. 50 and the electrode group 40 can be prevented from being displaced. In addition, the flow of the electrolytic solution between the plate member 50 and the electrode group 40 is not hindered, and the electrolytic solution can be easily impregnated from the end portion 40 d of the electrode group 40.
　以上説明したように、本実施形態の角形二次電池１００によれば、電極群４０の巻きずれを防止するとともに、厚さ方向の体積増加を防止できる。 As described above, according to the prismatic secondary battery 100 of the present embodiment, it is possible to prevent winding deviation of the electrode group 40 and to prevent an increase in volume in the thickness direction.
　なお、本実施形態では、板状部材５０が絶縁性を有する樹脂材料によって製作された板状の部材である場合について説明したが、板状部材５０の構成は、本実施形態で説明した構成に限定されない。以下、本実施形態の板状部材５０の変形例１から変形例３について説明する。 In addition, although this embodiment demonstrated the case where the plate-shaped member 50 was a plate-shaped member manufactured with the resin material which has insulation, the structure of the plate-shaped member 50 is the structure demonstrated by this embodiment. It is not limited. Hereinafter, Modification 1 to Modification 3 of the plate-like member 50 of the present embodiment will be described.
（変形例１）
　図７は、図４に示す実施形態１の板状部材５０の変形例１を示す長手方向に沿う断面図である。本変形例の板状部材５０Ａは、電極群４０の端部４０ｄに対向する多孔質層５１を備えている。多孔質層５１は、電池容器１０内の電解液を浸透させて電極群４０の端部４０ｄから電解液を含浸させることができる。したがって、本変形例の板状部材５０Ａを備えた角形二次電池によれば、実施形態１の角形二次電池１００と同様の効果を得られるだけでなく、電極群４０に対する電解液の含浸性を向上させることができる。 (Modification 1)
FIG. 7 is a cross-sectional view along the longitudinal direction showing Modification 1 of the plate-like member 50 of Embodiment 1 shown in FIG. The plate-like member 50 </ b> A of the present modification includes a porous layer 51 that faces the end 40 d of the electrode group 40. The porous layer 51 can impregnate the electrolytic solution in the battery container 10 and impregnate the electrolytic solution from the end portion 40 d of the electrode group 40. Therefore, according to the prismatic secondary battery including the plate-like member 50A of the present modification, not only the same effects as those of the prismatic secondary battery 100 of the first embodiment can be obtained, but also the electrolyte solution impregnation with respect to the electrode group 40. Can be improved.
（変形例２）
　図８は、図４に示す実施形態１の板状部材５０の変形例２を示す断面図であり、図８（ａ）は長手方向の断面図、図８（ｂ）は短手方向の断面図である。本変形例の板状部材５０Ｂは、電極群４０の端部４０ｄに対向する上面５０ａの面積が電池缶１１の底壁１１ｃすなわち電池容器１０の底面に対向する下面５０ｂの面積よりも大きく、外周面５０ｃが電極群４０の捲回軸Ａに対して傾斜している。本変形例の板状部材５０Ｂを備えた角形二次電池によれば、電極群４０を電池缶１１の開口部１１ｄに挿入する際に、電極群４０の端部４０ｄに固定された板状部材５０の外周面５０ｃによって、電極群４０の挿入を容易にすることができる。 (Modification 2)
8 is a cross-sectional view showing a second modification of the plate-like member 50 of the first embodiment shown in FIG. 4, where FIG. 8 (a) is a cross-sectional view in the longitudinal direction, and FIG. 8 (b) is a cross-section in the short direction. FIG. The plate-like member 50B of this modification has an area of the upper surface 50a facing the end portion 40d of the electrode group 40 larger than the area of the bottom wall 11c of the battery can 11, that is, the lower surface 50b facing the bottom surface of the battery container 10, The surface 50 c is inclined with respect to the winding axis A of the electrode group 40. According to the prismatic secondary battery including the plate-like member 50 </ b> B of the present modification, the plate-like member fixed to the end portion 40 d of the electrode group 40 when the electrode group 40 is inserted into the opening 11 d of the battery can 11. The electrode group 40 can be easily inserted by the outer peripheral surface 50c of the 50.
（変形例３）
　図９は、図４に示す実施形態１の板状部材５０の変形例３を示す斜視図である。本変形例の板状部材５０Ｃは、実施形態１の板状部材５０と同様の材料によって網目状に形成されている。本変形例の板状部材５０Ｂを備えた角形二次電池によれば、板状部材５０Ｃの網目によって電池容器１０内の電解液を電極群４０の端部４０ｄに到達させ、電極群４０に対する電解液の含浸性をより向上させることができる。 (Modification 3)
FIG. 9 is a perspective view showing a third modification of the plate-like member 50 of the first embodiment shown in FIG. The plate-like member 50C of this modification is formed in a mesh shape with the same material as the plate-like member 50 of the first embodiment. According to the prismatic secondary battery including the plate-like member 50B of the present modification, the electrolytic solution in the battery container 10 reaches the end 40d of the electrode group 40 by the mesh of the plate-like member 50C, and electrolysis with respect to the electrode group 40 is performed. Impregnation of the liquid can be further improved.
（実施形態２）
　以下、本発明の角形二次電池の実施形態２について、図１から図６までを援用し、図１０を用いて説明する。図１０は、図１に示すＸ－Ｘ断面に相当する本実施形態の角形二次電池１００Ａの矢視断面図である。 (Embodiment 2)
Hereinafter, Embodiment 2 of the prismatic secondary battery of the present invention will be described with reference to FIG. 10 with reference to FIGS. FIG. 10 is a cross-sectional view of the rectangular secondary battery 100A of the present embodiment corresponding to the XX cross section shown in FIG.
　本実施形態の角形二次電池１００Ａは、板状部材５０と電池缶１１の底壁１１ｃすなわち電池容器１０の底面との間に、板状部材５０を電極群４０の端部４０ｄに向けて付勢する弾性部材８０を備える点で、前述の実施形態１の角形二次電池１００と異なっている。本実施形態の角形二次電池１００のその他の点は、前述の実施形態１の角形二次電池１００と同一であるので、同一の部分には同一の符号を付して説明を省略する。 The rectangular secondary battery 100 </ b> A of the present embodiment is attached between the plate member 50 and the bottom wall 11 c of the battery can 11, that is, the bottom surface of the battery container 10, with the plate member 50 facing the end 40 d of the electrode group 40. This is different from the prismatic secondary battery 100 of the first embodiment described above in that the elastic member 80 is provided. Since the other points of the prismatic secondary battery 100 of the present embodiment are the same as those of the prismatic secondary battery 100 of the first embodiment described above, the same portions are denoted by the same reference numerals and description thereof is omitted.
　弾性部材８０としては、例えば、板バネ、コイルバネ、及び皿バネ等のバネ部材、又は、スチレンブタジエン系ゴム、エチレンプロピレン系ゴム、ポリエチレン系スポンジ、及びゴム系スポンジ等の弾性体を用いることができる。本実施形態の角形二次電池１００Ａによれば、実施形態１の角形二次電池１００と同様の効果が得られるだけでなく、弾性部材８０によって板状部材５０を電極群４０の端部４０ｄに向けて付勢して、電極群４０の端部４０ｄを板状部材５０によって押圧することができる。したがって、角形二次電池１００Ａが充放電を繰り返した際の電極群４０の巻きずれを効果的に防止することができる。 As the elastic member 80, for example, a spring member such as a leaf spring, a coil spring, and a disc spring, or an elastic body such as styrene butadiene rubber, ethylene propylene rubber, polyethylene sponge, and rubber sponge can be used. . According to the prismatic secondary battery 100A of the present embodiment, not only the same effects as those of the prismatic secondary battery 100 of the first embodiment can be obtained, but the plate-like member 50 is attached to the end 40d of the electrode group 40 by the elastic member 80. The end 40d of the electrode group 40 can be pressed by the plate-like member 50 by being biased toward the plate. Accordingly, it is possible to effectively prevent the winding deviation of the electrode group 40 when the prismatic secondary battery 100A is repeatedly charged and discharged.
　以上、図面を用いて本発明の実施の形態を詳述してきたが、具体的な構成はこの実施形態に限定されるものではなく、本発明の要旨を逸脱しない範囲における設計変更等があっても、それらは本発明に含まれるものである。 The embodiment of the present invention has been described in detail with reference to the drawings, but the specific configuration is not limited to this embodiment, and there are design changes and the like without departing from the gist of the present invention. They are also included in the present invention.
　例えば、本発明の角形二次電池は、モーターを駆動源としたハイブリッド自動車やゼロエミッション電気自動車等に適用される車載用の電池システムだけでなく、より広範な用途に利用することができる。例えば、本発明の角形二次電池を搭載した電池システムは、家庭用、業務用、産業用を問わず、太陽光発電や風力発電等で発電された電力で電池を充電して蓄電する蓄電システムとして使用することができる。また、本発明の角形二次電池を搭載した電池システムは、夜間の深夜電力を利用して電池を充電して蓄電する蓄電システムとして、あるいは宇宙ステーション、宇宙船、宇宙基地などの地上以外で利用可能な蓄電システムとして使用することもできる。さらに、本発明の角形二次電池を搭載した電池システムは、医療機器、建設機械、電力貯蔵システム、エレベータ、無人移動車両などの産業用として、またゴルフカート、ターレット車などの移動体用として利用することができる。 For example, the prismatic secondary battery of the present invention can be used not only for an in-vehicle battery system applied to a hybrid vehicle using a motor as a drive source, a zero emission electric vehicle, etc., but also for a wider range of uses. For example, a battery system equipped with the prismatic secondary battery of the present invention is a power storage system that charges and stores a battery with electric power generated by solar power generation, wind power generation, etc. regardless of whether it is for home use, business use, or industrial use. Can be used as In addition, the battery system equipped with the rectangular secondary battery of the present invention is used as a power storage system for charging and storing a battery by using nighttime midnight power, or other than on the ground such as a space station, a spacecraft, a space base, etc. It can also be used as a possible power storage system. Furthermore, the battery system equipped with the square secondary battery of the present invention is used for industrial purposes such as medical equipment, construction machinery, power storage systems, elevators, unmanned mobile vehicles, and for mobile objects such as golf carts and turret cars. can do.
１０　電池容器、１１　電池缶（電池容器）、１１ｃ　底壁（電池容器の底面）、１２　電池蓋（電池容器）、４０　電極群、４０ｄ　端部、４１　正極電極（電極）、４２　負極電極（電極）、５０　板状部材、５０ａ　電極群の端部に対向する面、５０ｂ　電池容器の底面に対向する面、５０ｃ　外周面、５１　多孔質層、６０　接着層、７０　粘着テープ、８０　弾性部材、１００，１００Ａ　角形二次電池、Ａ　捲回軸、Ｄ５０　板状部材の寸法、Ｔ４０　電極群の厚さ DESCRIPTION OF SYMBOLS 10 Battery container, 11 Battery can (battery container), 11c Bottom wall (bottom surface of battery container), 12 Battery cover (battery container), 40 Electrode group, 40d End part, 41 Positive electrode (electrode), 42 Negative electrode (electrode) ), 50 plate-like member, 50a surface facing the end of the electrode group, 50b surface facing the bottom of the battery container, 50c outer peripheral surface, 51 porous layer, 60 adhesive layer, 70 adhesive tape, 80 elastic member, 100 , 100A prismatic secondary battery, A winding axis, D 50 plate-like member dimensions, T 40 electrode group thickness

Claims (7)

  1. 　偏平角形の電池容器と、該電池容器に収容され該電池容器の底面に垂直な捲回軸を中心に正負の電極が捲回された偏平な電極群と、を備えた角形二次電池であって、
    　前記電池容器の前記底面と該底面に対向する前記電極群の前記捲回軸方向の端部との間に前記電極群の厚さよりも該厚さ方向の寸法が小さい剛性を有する板状部材が配置されていることを特徴とする角形二次電池。     A rectangular secondary battery comprising: a flat rectangular battery container; and a flat electrode group in which positive and negative electrodes are wound around a winding axis that is accommodated in the battery container and is perpendicular to the bottom surface of the battery container. And
    A plate-like member having a rigidity having a dimension in the thickness direction smaller than the thickness of the electrode group between the bottom surface of the battery container and an end portion of the electrode group facing the bottom surface in the winding axis direction. A prismatic secondary battery characterized by being arranged.
  2. 　前記板状部材は、前記電極群の前記端部に対向する多孔質層を備えることを特徴とする請求項１に記載の角形二次電池。 The prismatic secondary battery according to claim 1, wherein the plate-like member includes a porous layer facing the end of the electrode group.
  3. 　前記板状部材は、前記電極群の前記端部に対向する面の面積が前記電池容器の前記底面に対向する面の面積よりも大きく、外周面が前記電極群の捲回軸に対して傾斜していることを特徴とする請求項１に記載の角形二次電池。 The plate-like member has an area of a surface facing the end of the electrode group larger than an area of a surface facing the bottom surface of the battery container, and an outer peripheral surface is inclined with respect to a winding axis of the electrode group. The prismatic secondary battery according to claim 1, wherein:
  4. 　前記板状部材は、網目状に形成されていることを特徴とする請求項１に記載の角形二次電池。 The prismatic secondary battery according to claim 1, wherein the plate-like member is formed in a mesh shape.
  5. 　前記板状部材は、接着層を介して前記電極群の前記端部に固定されていることを特徴とする請求項１に記載の角形二次電池。 The prismatic secondary battery according to claim 1, wherein the plate-like member is fixed to the end portion of the electrode group through an adhesive layer.
  6. 　前記板状部材は、粘着テープによって前記電極群の前記端部に固定されていることを特徴とする請求項１に記載の角形二次電池。 The prismatic secondary battery according to claim 1, wherein the plate-like member is fixed to the end portion of the electrode group by an adhesive tape.
  7. 　前記板状部材と前記電池容器の前記底面との間に、前記板状部材を前記電極群の前記端部に向けて付勢する弾性部材を備えることを特徴とする請求項１に記載の角形二次電池。 2. The square according to claim 1, further comprising: an elastic member that urges the plate member toward the end of the electrode group between the plate member and the bottom surface of the battery case. Secondary battery.
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