WO2023152916A1 - 電池及び電池の製造方法 - Google Patents

電池及び電池の製造方法 Download PDF

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Publication number
WO2023152916A1
WO2023152916A1 PCT/JP2022/005478 JP2022005478W WO2023152916A1 WO 2023152916 A1 WO2023152916 A1 WO 2023152916A1 JP 2022005478 W JP2022005478 W JP 2022005478W WO 2023152916 A1 WO2023152916 A1 WO 2023152916A1
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WO
WIPO (PCT)
Prior art keywords
current collector
positive electrode
rigid portion
battery
electrode current
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2022/005478
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English (en)
French (fr)
Japanese (ja)
Inventor
博昭 江川
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Vehicle Energy Japan Inc
Original Assignee
Vehicle Energy Japan Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Vehicle Energy Japan Inc filed Critical Vehicle Energy Japan Inc
Priority to JP2023579993A priority Critical patent/JPWO2023152916A1/ja
Priority to US18/726,485 priority patent/US20250079654A1/en
Priority to PCT/JP2022/005478 priority patent/WO2023152916A1/ja
Priority to EP22925937.9A priority patent/EP4478466A4/en
Priority to CN202280075146.5A priority patent/CN118266130A/zh
Publication of WO2023152916A1 publication Critical patent/WO2023152916A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/538—Connection of several leads or tabs of wound or folded electrode stacks
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the present invention relates to a battery and a method for manufacturing a battery.
  • a current collecting member included in a battery and a current collector of an electrode (so-called current collector foil) are electrically connected by being joined to each other (for example, see Patent Document 1). reference).
  • the current collecting members and the current collectors of the electrodes may have variations in physical properties such as rigidity before they are joined. For this reason, even if the current collector and the current collector of the electrode are joined under the same bonding conditions in the mass production of batteries, if the physical properties of the current collector and the current collector of the electrode are relatively large, , there is a possibility that the current collecting member and the current collector of the electrode are not sufficiently joined.
  • a battery of the present invention includes a charge/discharge body including an electrode having a current collector and an active material, and a current collector joined to the current collector. At least one of the current collecting member and the current collector includes a first rigid portion having a predetermined rigidity and a second rigid portion adjacent to the first rigid portion and having higher rigidity than the first rigid portion. I have. The second rigid portion provided on at least one of the current collecting member and the current collector and the other of the current collecting member and the current collector are joined to each other.
  • the method for manufacturing a battery of the present invention is the method for manufacturing the battery described above.
  • the second rigid portion provided on at least one of the current collecting member and the current collector and the other of the current collecting member and the current collector are laminated to each other. It has a manufacturing process for bonding.
  • the reliability of the battery can be improved by sufficiently bonding the current collecting member and the current collector of the electrode.
  • the battery manufacturing method of the present invention it is possible to suppress poor bonding between the collector member and the collector of the electrode, thereby improving the reliability and productivity of the battery.
  • FIG. 2 is a perspective view showing the battery 1 of the first embodiment;
  • FIG. 2 is an exploded perspective view showing the battery 1;
  • 2 is an exploded perspective view showing constituent members of the battery 1 on the positive electrode 11 side.
  • FIG. 2 is a perspective view showing a charge/discharge body 10 of the battery 1.
  • FIG. 2 is a side view showing a joint portion between a positive current collector foil 11S of a positive electrode 11 and a positive current collector plate 21 in the battery 1.
  • FIG. FIG. 4 is a side view showing a manufacturing process of forming a second rigid portion 21q on a positive electrode current collecting plate 21 by pressing the positive electrode current collecting plate 21 in the manufacturing method of the battery 1;
  • FIG. 7 is a side view showing a manufacturing process in which the positive electrode current collector foil 11S of the positive electrode 11 and the second rigid portion 21q of the positive electrode current collector plate 21 are ultrasonically bonded following the manufacturing process shown in FIG. 6 ;
  • FIG. 11 is a side view showing a joint portion between a positive electrode current collector foil 111S of a positive electrode 111 and a positive electrode current collector plate 121 in a battery 2 of the second embodiment;
  • FIG. 11 is a side view showing a joint portion between a positive electrode current collector foil 111S of a positive electrode 111 and a positive electrode current collector plate 21 in a battery 3 of a third embodiment;
  • FIG. 11 is a side view showing a joint portion between a positive electrode current collector foil 11S of a positive electrode 11 and a positive electrode current collector plate 21 via an adhesive 70 in a battery 4 according to a fourth embodiment;
  • a left-handed XYZ orthogonal coordinate system having X, Y, and Z axes as coordinate axes is used.
  • the arrows on each of the X-axis, Y-axis, and Z-axis indicate the positive direction of the coordinate axes.
  • the X-axis is the coordinate axis in the longitudinal direction of the rectangular parallelepiped battery.
  • the Y-axis is the coordinate axis in the lateral direction of the battery.
  • the Z-axis is the coordinate axis in the height direction of the battery.
  • the positional relationship represented by the XYZ orthogonal coordinate system is merely a relative positional relationship.
  • the battery 1 includes a charge/discharge body 10 for charging and discharging electricity, a current collecting member 20 connected to the charge/discharge body 10, and an external terminal 30 connected to the current collecting member 20. contains.
  • the battery 1 includes an exterior body 40 in which the components of the battery 1 are accommodated or attached, an insulator 50 that insulates the components of the battery 1 from the exterior body 40, and the components of the battery 1 and the exterior body 40 are sealed. It includes a sealed encapsulant 60 .
  • the charge/discharge body 10 charges and discharges electricity.
  • the charge/discharge body 10 shown in FIGS. 2, 4 and 5 includes a positive electrode 11 (electrode), a negative electrode 12 (electrode), a separator 13, and an electrolyte.
  • the charge/discharge body 10 is formed by winding a component member in which a positive electrode 11, a separator 13, a negative electrode 12, and a separator 13 are laminated in this order and wound into a rectangular parallelepiped shape. .
  • a separator 13 is arranged as the outermost layer of the wound charge/discharge body 10 .
  • the positive electrode 11 (electrode) includes a long positive electrode collector foil 11S (collector) and a positive electrode active material layer 11T joined to the positive electrode collector foil 11S.
  • the positive electrode 11 is wound together with the negative electrode 12 and the separator 13 to form a rectangular parallelepiped with four convexly curved corners.
  • a pair of ends (thickness portions) exposed to the outside are positioned at both ends in the longitudinal direction X of the battery 1 .
  • a positive current collecting portion 11a is provided at one end of the positive current collecting foil 11S.
  • the positive current collecting portion 11 a is joined to the positive current collecting plate 21 . As shown in FIGS.
  • the positive electrode current collecting portion 11a is compressed in the lateral direction Y of the battery 1 in a wound and bundled state to remove a gap.
  • the positive current collecting portion 11a is compressed, but need not be plastically deformed.
  • the positive electrode collector portion 11 a extends along the height direction Z of the battery 1 .
  • the positive electrode current collector 11a has a thickness of, for example, 0.1 mm to 1.4 mm along the lateral direction Y of the battery 1 in an unbound state.
  • the positive current collecting portion 11a of the positive electrode 11 is made of, for example, aluminum or an aluminum alloy.
  • the positive electrode active material layer 11T contains a positive electrode active material (active material) composed of a lithium-containing composite oxide, a binder, a conductive aid, and the like. Lithium (Li) and metal elements such as nickel (Ni), cobalt (Co), manganese (Mn), and lithium (Li) are used for lithium-containing composite oxides.
  • the negative electrode 12 (electrode) includes an elongated negative electrode current collector foil 12S (current collector) and a negative electrode active material layer 12T joined to the negative electrode current collector foil 12S.
  • One end of the negative electrode current collector foil 12S is provided with a negative electrode current collector 12a.
  • the negative electrode current collecting portion 12a of the negative electrode current collecting foil 12S faces the positive electrode current collecting portion 11a of the positive electrode current collecting foil 11S along the longitudinal direction X.
  • the negative electrode current collecting portion 12 a is joined to the negative electrode current collecting plate 22 .
  • the negative electrode current collecting portion 12a is compressed in the lateral direction Y of the battery 1 in the wound state to remove the gap.
  • the negative electrode current collector 12a is compressed, but need not be plastically deformed.
  • the negative electrode current collector 12 a extends along the height direction Z of the battery 1 .
  • the thickness of the negative electrode current collecting portion 12a along the lateral direction Y of the battery 1 is, for example, 0.05 mm to 0.7 mm in an unbound state.
  • the negative electrode collector 12a of the negative electrode 12 is made of, for example, copper or a copper alloy.
  • the negative electrode active material layer 12T contains a negative electrode active material (active material) made of a carbon-based material, a binder, a conductive aid, and the like. Graphite, for example, is used as the carbon-based material.
  • the separator 13 insulates the positive electrode 11 and the negative electrode 12, as shown in FIG.
  • the separator 13 is impregnated with an electrolyte.
  • the separator 13 is formed in an elongated shape.
  • the separator 13 is made of a porous material.
  • Polyethylene (pE: polqEthqlene) or polypropylene (pp: polqpropqlene) is used for the separator 13 .
  • a heat-resistant insulating member may be used instead of the separator 13 . Ceramics, for example, is used for the heat-resistant insulating member. Such a configuration is a so-called separatorless configuration.
  • the electrolyte corresponds to the so-called electrolytic solution.
  • the electrolyte is impregnated in separator 13 .
  • the electrolyte contains an organic solvent, a supporting salt, and additives.
  • carbonic acid ester is used as the organic solvent.
  • Lithium salt is used as the supporting salt, for example.
  • the collector member 20 is electrically connected to the charge/discharge body 10 .
  • the collector member 20 is joined to the collector foil of the electrode.
  • the collector 20 shown in FIGS. 2, 3 and 5 includes a positive collector 21 (collector) and a negative collector 22 (collector).
  • the positive electrode current collector plate 21 (collector member) electrically connects the positive electrode current collector foil 11S of the positive electrode 11 and the positive electrode terminal 31 .
  • the positive collector plate 21 includes a base portion 21a, an insertion hole 21b, and a collector portion 21c.
  • the base portion 21 a is formed in a plate shape and joined to the positive electrode terminal 31 .
  • the insertion hole 21b penetrates the base portion 21a.
  • An insertion portion 31b of the positive electrode terminal 31 is inserted into the insertion hole 21b.
  • Current collecting portion 21c is formed in a longer shape than base portion 21a and extends from base portion 21a toward charge/discharge body 10 .
  • Current collecting portion 21 c is bent along the outer shape of positive electrode current collecting portion 11 a of positive electrode 11 .
  • the positive collector plate 21 is made of, for example, aluminum or an aluminum alloy.
  • the positive electrode collector plate 21 includes a collector portion 21c and a first rigid portion 21p and a second rigid portion 21q.
  • the current collecting portion 21c has a thickness along the lateral direction Y of the battery 1 of, for example, 0.5 mm to 3 mm.
  • the first rigid portion 21p has a predetermined rigidity.
  • the second rigid portion 21q is adjacent to the first rigid portion 21p along the height direction Z of the battery 1, and has higher rigidity than the first rigid portion 21p.
  • the second thickness t2 of the second rigid portion 21q is thinner than the first thickness t1 of the first rigid portion 21p.
  • the second rigid portion 21q is formed by plastically deforming a portion adjacent to the first rigid portion 21p of the positive current collecting plate 21 by, for example, cold working.
  • the thickness of the second rigid portion 21q is equivalent to the thickness of the first rigid portion 21p before cold working. That is, the second rigid portion 21q is rolled from the first thickness t1 to the second thickness t2 by cold working.
  • stiffness represents the hardness of an object.
  • Rigidity is defined, for example, by hardness measured by a Vickers hardness test or the like, stress-strain curve measured by a tensile test or the like, or the like.
  • the Vickers hardness test is stipulated in JIS Z 2244, for example.
  • a stress-strain curve represents the hardness of an object based on Young's modulus. The lower the Young's modulus, the higher the hardness of the object.
  • the second rigid portion 21q of the positive electrode current collector plate 21 is joined to the positive electrode current collector foil 11S of the positive electrode 11, as shown in FIG.
  • a joint portion 21r included in the second rigid portion 21q is joined to the positive current collector foil 11S.
  • the joint portion 21r is joined to the positive current collector foil 11S by ultrasonic waves.
  • the second thickness t2 of the second rigid portion 21q is thicker than the third thickness t3 of at least one positive current collector foil 11S.
  • the third thickness t3 is the thickness of at least one positive electrode current collector foil 11S among the bundled plural positive electrode current collector foils 11S.
  • the negative electrode current collector plate 22 (collector member) electrically connects the negative electrode current collector foil 12S of the negative electrode 12 and the negative electrode terminal 32 .
  • the shape of the negative electrode current collector plate 22 corresponds to the shape of the positive electrode current collector plate 21 reversed with the height direction Z as a boundary, with the center in the longitudinal direction X of the battery 1 as a reference.
  • the negative collector plate 22 includes a base portion, an insertion hole, and a collector portion, similarly to the positive collector plate 21 .
  • the base is formed in a plate shape and joined to the negative electrode terminal 32 .
  • the insertion hole penetrates through the base. An insertion portion of the negative electrode terminal 32 is inserted into the insertion hole.
  • the current collector is formed longer than the base and extends from the base toward charge/discharge body 10 .
  • the current collecting portion is bent along the outer shape of the negative electrode current collecting portion 12 a of the negative electrode 12 .
  • the negative electrode current collector plate 22 is made of, for example, copper or a copper alloy.
  • the negative electrode collector plate 22 includes a first rigid portion 22p and a second rigid portion 22q in the collector portion 22c.
  • the first rigid portion 22p has a predetermined rigidity.
  • the second rigid portion 22q is adjacent to the first rigid portion 22p along the height direction Z of the battery 1, and has higher rigidity than the first rigid portion 22p.
  • the second thickness of the second rigid portion 22q is thinner than the first thickness of the first rigid portion 22p.
  • the second rigid portion 22q is formed by plastically deforming a portion of the negative electrode current collecting plate 22 adjacent to the first rigid portion 22p by, for example, cold working.
  • the thickness of the second rigid portion 22q is equal to the thickness of the first rigid portion 22p before cold working. That is, the second rigid portion 22q is rolled from the first thickness to the second thickness by cold working.
  • the second rigid portion 22q of the negative electrode current collector plate 22 is joined to the negative electrode current collector foil 12S of the negative electrode 12.
  • a joint portion 22r included in the second rigid portion 22q is joined to the negative electrode current collector foil 12S.
  • the joint portion 22r is joined to the negative electrode current collector foil 12S by ultrasonic waves.
  • the second thickness of the second rigid portion 22q is greater than the third thickness of at least one or more negative electrode current collector foils 12S.
  • the third thickness is the thickness of at least one or more of the bundled negative electrode current collector foils 12S.
  • the external terminal 30 is connected to the collector member 20 .
  • the external terminals 30 shown in FIGS. 1-3 include a positive terminal 31 and a negative terminal 32 .
  • the positive terminal 31 is connected to the positive collector plate 21 .
  • the positive electrode terminal 31 includes a rectangular parallelepiped base portion 31a, a cylindrical insertion portion 31b protruding downward from the base portion 31a, and a cylindrical joint portion protruding downward from the periphery of the base portion 31a. 31c included.
  • the base portion 31a of the positive electrode terminal 31 is in contact with the base portion 54a of the positive electrode side second insulating plate 54.
  • the insertion portion 31b is inserted into the insertion hole 54b of the positive electrode-side second insulating plate 54, the positive electrode-side insertion hole 42a of the lid 42, the insertion hole 52b of the positive electrode-side first insulating plate 52, and the insertion hole 21b of the positive current collector plate 21.
  • the joint portion 31 c protrudes downward from the insertion hole 21 b of the positive electrode current collector plate 21 , is expanded radially outward, and is joined to the positive electrode current collector plate 21 .
  • the joint portion 31c is crimped to the periphery of the insertion hole 21b of the positive electrode current collecting plate 21 . Furthermore, the joint portion 31 c is welded to the periphery of the insertion hole 21 b of the positive electrode current collector plate 21 .
  • the positive electrode terminal 31 is made of, for example, aluminum or an aluminum alloy.
  • the negative terminal 32 is connected to the negative current collecting plate 22 .
  • the shape of the negative electrode terminal 32 corresponds to the shape of the positive electrode terminal 31 reversed with the height direction Z as a boundary, with the center in the longitudinal direction X of the battery 1 as a reference.
  • the negative terminal 32 includes a rectangular plate-shaped base, a cylindrical insertion section protruding downward from the base, and a cylindrical joint protruding downward from the periphery of the base. .
  • the base of the negative terminal 32 is in contact with the base of the second negative insulating plate 55 .
  • the insertion portion is inserted into the insertion hole of the negative electrode side second insulating plate 55 , the negative electrode side insertion hole of the lid 42 , the negative electrode side first insulating plate insertion hole, and the negative electrode current collector plate 22 .
  • the joint portion protrudes downward from the insertion hole of the negative electrode current collector plate 22 , is expanded radially outward, and is joined to the negative electrode current collector plate 22 . That is, the joint portion is caulked around the periphery of the insertion hole of the negative electrode current collector plate 22 . Furthermore, the joint portion is welded to the periphery of the insertion hole of the negative electrode current collector plate 22 .
  • the negative electrode terminal 32 is made of, for example, copper or a copper alloy.
  • the components of the battery 1 are accommodated or attached to the exterior body 40 .
  • the exterior body 40 shown in FIGS. 1 to 3 includes a container 41 , a lid 42 and a sealing plug 43 .
  • the container 41 accommodates the charge/discharge body 10 and the like covered with an insulating cover 51, as shown in FIG.
  • the container 41 is configured by a rectangular parallelepiped metal can.
  • the container 41 includes an opening 41a that opens in the height direction Z, and a housing portion 41b that is continuous with the opening 41a.
  • the container 41 is made of, for example, aluminum or an aluminum alloy.
  • the lid 42 seals the opening 41a of the container 41, as shown in FIGS.
  • the lid 42 is formed of a long plate-shaped metal plate.
  • the lid 42 is formed with a positive electrode side insertion hole 42a formed by a circular through hole on one end side in the longitudinal direction X.
  • the insertion portion 31b of the positive electrode terminal 31 is inserted into the positive electrode side insertion hole 42a.
  • the lid 42 is formed with a negative electrode side insertion hole configured by a circular through hole on the other end side in the longitudinal direction X.
  • An insertion portion of the negative electrode terminal 32 is inserted into the negative electrode side insertion hole.
  • the lid 42 has an injection hole formed by a circular through hole between the positive electrode side insertion hole 42a and the negative electrode side insertion hole.
  • the electrolyte is injected from the lid 42 toward the container 41 through the injection hole.
  • a sealing plug 43 is inserted into the injection hole.
  • the lid 42 is provided with a split valve 42c in the center in the longitudinal direction X, as shown in FIG.
  • the lid 42 is made of aluminum or an aluminum alloy, for example.
  • the sealing plug 43 seals the injection hole of the lid 42, as shown in FIGS.
  • a sealing plug 43 is welded to the lid 42 .
  • the sealing plug 43 is made of, for example, aluminum or an aluminum alloy.
  • the insulator 50 insulates the constituent members of the battery 1 and the exterior body 40 .
  • the insulator 50 shown in FIGS. 1 to 3 includes an insulating cover 51, a positive electrode-side first insulating plate 52, a negative electrode-side first insulating plate, a positive electrode-side second insulating plate 54, and a negative electrode-side second insulating plate 55. .
  • the insulating cover 51 covers the charge/discharge body 10 and insulates the charge/discharge body 10 from the container 41, as shown in FIG.
  • the insulating cover 51 is formed of a polyhedral sheet.
  • the insulating cover 51 is folded into a box shape to form a pentahedral shape.
  • the insulating cover 51 is open at a portion facing the lid 42 .
  • the insulating cover 51 is made of polypropylene (polqpropqlene), for example.
  • the positive electrode side first insulating plate 52 insulates the positive electrode collector plate 21 and the lid 42 as shown in FIG.
  • the positive electrode-side first insulating plate 52 includes a rectangular plate-like base portion 52a, an insertion hole 52b penetrating the base portion 52a, and a convex portion 52c that surrounds the side edge of the base portion 52a and protrudes in a direction away from the lid . contains.
  • the positive electrode side first insulating plate 52 the positive current collecting plate 21 is accommodated in a space defined by the base portion 52a and the convex portion 52c.
  • the insertion portion 31b of the positive electrode terminal 31 is inserted into the insertion hole 52b.
  • the positive electrode side first insulating plate 52 is made of, for example, an insulating resin.
  • the negative electrode side first insulating plate insulates the negative electrode collector plate 22 and the lid 42 .
  • the shape of the negative electrode-side first insulating plate corresponds to the shape of the positive electrode-side first insulating plate 52 inverted with respect to the height direction Z, with the center in the longitudinal direction X of the battery 1 as a reference.
  • the negative electrode side first insulating plate Similar to the positive electrode side first insulating plate 52 , the negative electrode side first insulating plate has a rectangular plate-like base, an insertion hole penetrating the base, and an annular side edge of the base surrounded in a direction away from the lid 42 . It contains protruding protrusions.
  • the negative electrode current collector plate 22 is housed in a space defined by the base and the projections of the negative electrode side first insulating plate. An insertion portion of the negative electrode terminal 32 is inserted into the insertion hole.
  • the negative electrode side first insulating plate is made of, for example, an insulating resin.
  • the positive electrode side second insulating plate 54 insulates the positive electrode terminal 31 and the lid 42 as shown in FIG.
  • the positive electrode side second insulating plate 54 has a rectangular plate-shaped base portion 54a, an insertion hole 54b passing through the base portion 54a, and a convex portion 54c that surrounds the side edge of the base portion 54a annularly and protrudes in a direction away from the lid 42. contains.
  • the positive electrode terminal 31 is accommodated in a space defined by the base portion 54a and the convex portion 54c.
  • the insertion portion 31b of the positive electrode terminal 31 is inserted into the insertion hole 54b.
  • the positive electrode side second insulating plate 54 is made of, for example, an insulating resin.
  • the negative electrode side second insulating plate 55 insulates the negative electrode terminal 32 and the lid 42 .
  • the shape of the negative electrode-side second insulating plate 55 corresponds to the shape of the positive electrode-side second insulating plate 54 that is reversed with respect to the height direction Z with respect to the center of the battery 1 in the longitudinal direction X. .
  • the negative electrode side second insulating plate 55 has a rectangular plate-shaped base, an insertion hole penetrating the base, and an annular side edge of the base enclosing the lid 42 in a direction away from the lid 42 . contains a protruding protrusion.
  • the negative electrode terminal 32 is accommodated in a space defined by the base portion and the convex portion. An insertion portion of the negative electrode terminal 32 is inserted into the insertion hole.
  • the negative electrode side second insulating plate 55 is made of, for example, an insulating resin.
  • the sealing body 60 seals the constituent members of the battery 1 and the exterior body 40 .
  • the sealing body 60 shown in FIG. 3 includes a positive electrode side gasket 61 and a negative electrode side gasket.
  • the positive electrode side gasket 61 insulates the positive electrode side second insulating plate 54 and the lid 42 as shown in FIG.
  • the positive electrode side gasket 61 is formed in a cylindrical shape.
  • the positive electrode side gasket 61 includes a first insertion portion 61a having a relatively large outer diameter, a second insertion portion 61b continuous with the first insertion portion 61a and having a relatively small outer diameter, and a first insertion portion 61a and a second insertion portion 61b. It includes an insertion hole 61c passing through the portion 61b.
  • the first insertion portion 61 a of the positive electrode side gasket 61 is inserted into the insertion hole 54 b of the positive electrode side second insulating plate 54 .
  • the second insertion portion 61 b of the positive electrode side gasket 61 is inserted into the positive electrode side insertion hole 42 a of the lid 42 .
  • the insertion portion 31b of the positive electrode terminal 31 is inserted into the insertion hole 61c.
  • the positive electrode side gasket 61 is made of, for example, insulating and elastic rubber.
  • the negative electrode side gasket insulates the negative electrode side second insulating plate 55 and the lid 42 .
  • the shape of the negative electrode-side gasket corresponds to the shape of the positive electrode-side gasket 61 reversed with the height direction Z as a boundary, with the center in the longitudinal direction X of the battery 1 as a reference.
  • the negative electrode side gasket includes a first insertion portion having a relatively large outer diameter, a second insertion portion continuous with the first insertion portion and having a relatively small outer diameter, and the first insertion portion. It includes an insertion hole passing through the second insertion portion. The first insertion portion of the negative gasket is inserted into the insertion hole of the second negative insulating plate 55 .
  • the second insertion portion of the negative electrode side gasket is inserted into the negative electrode side insertion hole of the lid 42 .
  • An insertion portion of the negative electrode terminal 32 is inserted into the insertion hole.
  • the negative electrode side gasket is made of, for example, insulating and elastic rubber.
  • FIG. 6 shows a manufacturing process for forming the second rigid portion 21q of the positive electrode current collecting plate 21 by pressing the positive electrode current collecting plate 21.
  • the second rigid portion 21q is formed by pressing a region adjacent to the first rigid portion 21p of the positive current collecting plate 21 .
  • the rigidity of the second rigid portion 21q formed by pressing becomes higher than the rigidity of the first rigid portion 21p due to work hardening.
  • the pressing machine 102 is brought close to the table 101 on which the positive electrode current collecting plate 21 is placed, and the region adjacent to the first rigid portion 21p of the positive electrode current collecting plate 21 is partially pressed by the pressing machine 102. to roll.
  • a second rigid portion 21 q is formed on the positive current collector plate 21 by a pressing force P ⁇ b>1 input from the press machine 102 to the positive current collector plate 21 . That is, the second rigid portion 21q is formed in a region adjacent to the first rigid portion 21p of the positive current collector plate 21 by cold working. In this manufacturing process, the thickness reduction ratio S of the region of the second rigid portion 21q is set to 0% ⁇ S ⁇ 10% by pressing the positive electrode current collecting plate 21. As shown in FIG. As shown in FIG. 5, the second thickness t2 of the second rigid portion 21q is less than the first thickness t1 of the first rigid portion 21p by up to 10%.
  • FIG. 7 shows a manufacturing process in which the positive electrode current collector foil 11S of the positive electrode 11 and the second rigid portion 21q of the positive electrode current collector plate 21 are joined by ultrasonic waves following the manufacturing process of cold working shown in FIG. ing.
  • the horn 103 and the anvil 104 sandwich the positive current collector foil 11S and the second rigid portion 21q.
  • the positive electrode current collector foil 11S and the second rigid portion 21q are ultrasonically bonded by the ultrasonic wave P2 input from the horn 103 to the positive electrode current collector foil 11S.
  • the effect of the battery 1 and the manufacturing method of the battery 1 will be described with respect to the positive electrode 11 side.
  • the effect on the negative electrode 12 side is the same as the effect on the positive electrode 11 side. Therefore, description of the side of the negative electrode 12 is omitted.
  • the positive electrode current collector plate 21 includes, as shown in FIG. A rigid portion 21q is provided.
  • the second rigid portion 21q of the positive electrode current collector plate 21 and the positive electrode current collector foil 11S of the positive electrode 11 are joined to each other.
  • the manufacturing method of the battery 1 includes a manufacturing step of joining the second rigid portion 21q of the positive electrode current collecting plate 21 and the positive electrode current collecting foil 11S of the positive electrode 11 to each other.
  • the rigidity of the positive electrode current collector plate 21 is partially increased to form the second rigid portion 21q before the positive electrode current collector plate 21 and the positive electrode current collector foil 11S are joined together. It is possible to suppress variations in the physical properties of the 2-rigid portion 21q. By suppressing variations in the physical properties of the positive current collector plate 21, it is possible to relatively increase the ratio of the positive current collector plate 21 and the positive current collector foil 11S that meet predetermined bonding conditions in mass production.
  • the bonding conditions are conditions under which the positive current collector plate 21 and the positive current collector foil 11S can be sufficiently bonded.
  • the yield of the charge/discharge body 10 including the positive electrode current collector plate 21 and the positive electrode 11 can be improved. Specifically, after the second rigid portion 21q of the positive electrode current collector plate 21 and the positive electrode current collector foil 11S are joined together, the second rigid portion 21q of the positive electrode current collector plate 21 and the positive electrode current collector foil 11S are peeled off. Conduction failure (circuit open) can be suppressed.
  • the bonding between the second rigid portion 21q of the positive electrode current collector plate 21 and the positive electrode current collector foil 11S becomes insufficient. It is possible to suppress an increase in electrical resistance caused by Insufficient bonding means that the second rigid portion 21q of the positive current collector plate 21 and the positive current collector foil 11S are partially separated.
  • the reliability of the battery 1 can be improved by the sufficiently bonded positive electrode current collector plate 21 and the positive electrode current collector foil 11S of the positive electrode 11. Moreover, according to the manufacturing method of the battery 1, the reliability and productivity of the battery 1 can be improved by suppressing the defective connection between the positive electrode current collector plate 21 and the positive electrode current collector foil 11S of the positive electrode 11. FIG. Furthermore, according to such a configuration, variations in the physical properties of the positive electrode current collector plate 21 can be suppressed, so that inexpensive materials with large variations in physical properties can be used.
  • a joint portion 21r included in the second rigid portion 21q of the positive electrode current collector plate 21 and the positive electrode current collector foil 11S are joined to each other.
  • the joint portion 21r is included in the second rigid portion 21q and constitutes most of the second rigid portion 21q.
  • the joint portion 21r can constitute the entire second rigid portion 21q.
  • the portion excluding the outer edge of the second rigid portion 21q is preferably configured as the joint portion 21r.
  • the portion other than the outer edge of the second rigid portion 21q should be prevented from leaking the laser light around the welded portion. It is desirable to configure it as the joint portion 21r. Further, when the positive electrode current collector plate 21 and the positive electrode current collector foil 11S of the positive electrode 11 are crimped and joined to each other, the portion excluding the outer edge of the second rigid portion 21q is replaced by the joint portion 21r, considering the prevention of excessive distortion of the joint portion.
  • the positive current collector plate 21 and the positive current collector foil 11S are joined by ultrasonic waves.
  • the positive current collector plate 21 and the positive current collector foil 11S are joined by ultrasonic waves.
  • the positive electrode current collector plate 21 and the positive electrode current collector foil 11S are more likely to elongate in the direction intersecting with the stacking direction, as compared with heat welding and laser welding.
  • the rigidity of the second rigid portion 21q is relatively high, the positive electrode current collecting plate 21 can suppress expansion in the direction intersecting with the stacking direction.
  • the positive electrode current collector plate 21 has a second thickness t2 of the second rigid portion 21q that is greater than a first thickness t1 of the first rigid portion 21p in the lateral direction Y of the battery. thin.
  • the second rigid portion 21q is formed by pressing a part of the positive electrode current collecting plate 21 .
  • the rigidity of the second rigid portion 21q becomes higher than that of the first rigid portion 21p by cold working by pressing.
  • 2 rigid portion 21q can be configured. Therefore, while the second rigid portion 21q is easily formed, the rigidity of the second rigid portion 21q can be improved more than the rigidity of the first rigid portion 21p.
  • the second rigid portion 21q of the positive electrode current collecting plate 21 is formed by plastically deforming the positive electrode current collecting plate 21, as shown in FIG. That is, the second rigid portion 21q can be formed by cold working. With such a configuration, the second rigid portion 21q can be easily formed.
  • the plastic deformation of the second rigid portion 21q is performed, for example, by general-purpose press molding. Since the cold working by press molding can easily reduce variations in working, the rigidity of the second rigid portion 21q can be improved with high accuracy.
  • the second thickness t2 of the second rigid portion 21q of the positive electrode current collector plate 21 is thicker than the third thickness t3 of the positive electrode current collector foil 11S joined to the second rigid portion 21q, as shown in FIG.
  • the third thickness t3 is the thickness of at least one of the bundled positive electrode current collector foils 11S.
  • the second rigid portion 21q that is plastically deformed to increase the rigidity is formed in the positive electrode current collector plate 21 that is thicker than the positive electrode current collector foil 11S. Since the positive electrode current collector plate 21 is thicker than the positive electrode current collector foil 11S, it is possible to sufficiently suppress the occurrence of wrinkles and distortions more than the positive electrode current collector foil 11S. Therefore, press molding of the positive electrode current collector plate 21 is easier than press molding of the positive electrode current collector foil 11S. Therefore, the positive current collector plate 21 can form the second rigid portion 21q more easily than the positive current collector foil 11S.
  • the first rigid portion and the second rigid portion may be provided on at least one of the positive electrode 11 and the negative electrode 12 among the electrodes. Only the positive electrode 11 may be provided with the second rigid portion 21q.
  • aluminum has a higher rate of rigidity improvement due to work hardening. Therefore, the positive electrode current collector plate 21 containing aluminum is more effective in improving rigidity due to work hardening than the negative electrode current collector foil 12S of the negative electrode 12 containing copper. Therefore, by providing the second rigid portion 21q only on the side of the positive electrode 11 where work hardening has a relatively large effect of improving rigidity, it is possible to suppress separation between the positive electrode current collector plate 21 and the positive electrode current collector foil 11S.
  • the rigidity is determined by Vickers hardness or Young's modulus.
  • stiffness can be defined by a universal modulus such as Vickers hardness or Young's modulus. Therefore, the rigidity of the second rigid portion 21q of the positive electrode current collecting plate 21 can be determined with high accuracy.
  • the reduction rate S of the thickness of the second rigid portion 21q is set to 0% ⁇ S ⁇ 10%.
  • the rigidity of the second rigid portion 21q of the positive electrode current collecting plate 21 can be sufficiently increased.
  • the hardness (rigidity) defined by the Vickers hardness is relatively reduced to It can be increased by about 25%.
  • aluminum can reduce the Young's modulus by about 5% when the thickness is reduced by 3%.
  • aluminum can provide a relative increase in Vickers hardness of about 35% when the thickness is reduced by 5%.
  • aluminum can provide a relative increase in Vickers hardness of about 50% when the thickness is reduced by 10%.
  • the positive electrode 111 side will be described.
  • the configuration and effect on the negative electrode side are the same as the configuration and effect on the positive electrode 111 side. Therefore, description of the negative electrode side is omitted.
  • the battery 2 of the second embodiment differs from the battery 1 of the first embodiment in that the positive current collector foil 111S of the positive electrode 111 is provided with the first rigid portion 111p and the second rigid portion 111q.
  • the positive electrode 111 has the same configuration as the positive electrode 11, except that the positive electrode collector foil 111S is provided with the second rigid portion 111q and the joint portion 111r.
  • the positive electrode current collector plate 121 has the same configuration as the positive electrode current collector plate 21 except that the second rigid portion is not provided.
  • the same components as those of the battery 1 of the first embodiment are denoted by the same reference numerals, and description thereof is omitted.
  • the positive current collector foil 111S includes a first rigid portion 111p and a second rigid portion 111q.
  • the first rigid portion 111p has a predetermined rigidity.
  • the second rigid portion 111q is adjacent to the first rigid portion 111p along the height direction Z of the battery 2, and has higher rigidity than the first rigid portion 111p.
  • second thickness t5 of second rigid portion 111q is thinner than first thickness t4 of first rigid portion 111p.
  • the second rigid portion 111q is formed by plastically deforming a portion adjacent to the positive current collecting plate 121 by, for example, cold working.
  • the thickness of the second rigid portion 111q is equivalent to the thickness of the first rigid portion 111p before cold working. That is, the second rigid portion 111q is rolled from the first thickness t4 to the second thickness t5 by cold working.
  • the second rigid portion 111q of the positive electrode current collector foil 111S is joined to the current collector portion 121c of the positive electrode current collector plate 121.
  • a joint portion 111r included in the second rigid portion 111q is joined to the collector portion 121c of the positive collector plate 121 .
  • the joint portion 111r is joined to the positive collector plate 121 by ultrasonic waves.
  • the bundled positive electrode current collector 111a is compressed in the lateral direction Y of the battery 1 in a state in which the positive electrode 111, the separator 13, and the negative electrode 12 are wound, and the gap is removed. ing.
  • the second rigid portion 111q can be formed in the positive electrode current collector foil 111S by pressing the positive electrode current collector portion 111a so as to partially plastically deform it. A portion that does not plastically deform the positive current collecting portion 111a corresponds to the first rigid portion 111p.
  • the protrusion is formed in two steps.
  • the second rigid portion 111q is formed by compressing and plastically deforming the positive current collecting portion 111a by the relatively protruding portion of the convex portion.
  • the relatively non-protruding portion of the convex portion only compresses the positive current collecting portion 111a to form the first rigid portion 111p.
  • the positive electrode collector portion 111a is processed from the wound and bundled state shown in FIG.
  • a second rigid portion 111q is formed on the positive current collecting portion 111a by the relatively projecting portion of the convex portion of the mold.
  • a first rigid portion 111p is formed on the positive current collecting portion 111a by a relatively non-protruding portion of the convex portion of the mold.
  • the wound and bundled positive electrode current collecting portion 111a may be compressed. good.
  • the joint portion 111r of the positive current collector foil 111S and the positive current collector plate 121 are joined by ultrasonic waves.
  • the manufacturing method of the battery 2 other than the above is the same as the manufacturing method of the battery 1 of the first embodiment.
  • the positive collector foil 111S is provided with the second rigid portion 111q.
  • the reliability of the battery 2 can be improved by the sufficiently bonded positive electrode current collector plate 121 and the second rigid portion 111q of the positive electrode current collector foil 111S.
  • the reliability and productivity of the battery 2 can be improved by suppressing the bonding failure between the positive electrode current collecting plate 121 and the positive electrode 111.
  • FIG. Furthermore, according to such a configuration, variations in the physical properties of the positive electrode current collector foil 111S can be suppressed, so that inexpensive materials with large variations in physical properties can be used.
  • the positive electrode 111 side will be described.
  • the configuration and effect on the negative electrode side are the same as the configuration and effect on the positive electrode 111 side. Therefore, description of the negative electrode side is omitted.
  • the positive current collecting plate 21 of the first embodiment and the positive current collecting foil 111S of the positive electrode 111 of the second embodiment are joined.
  • the same components as those of the battery 1 of the first embodiment or the battery 2 of the second embodiment are denoted by the same reference numerals, and description thereof is omitted.
  • the joint portion 111r included in the second rigid portion 111q of the positive electrode current collector foil 111S and the second rigid portion 21q of the positive electrode current collector plate 21 are laminated and joined as shown in FIG.
  • the manufacturing method of the battery 3 other than the above is the same as the manufacturing method of the battery 1 of the first embodiment and the battery 2 of the second embodiment.
  • the positive collector plate 21 is provided with the second rigid portion 21q.
  • the positive collector foil 111S is provided with the second rigid portion 111q.
  • the reliability of the battery 3 can be improved by the sufficiently bonded second rigid portion 111q of the positive electrode current collector plate 21 and the second rigid portion 111q of the positive electrode current collector foil 111S.
  • poor bonding between the positive current collecting plate 21 and the positive electrode 111 can be suppressed, and the reliability and productivity of the battery 3 can be improved.
  • variations in the physical properties of the positive electrode current collector plate 21 and the positive electrode current collector foil 111S can be suppressed, so that inexpensive materials with large variations in physical properties can be used.
  • the positive electrode current collector foil 11S and the positive electrode current collector plate 21 are bonded via a conductive adhesive 70 (adhesive member).
  • a conductive adhesive 70 adheresive member
  • the joint portion 21r of the positive electrode current collector plate 21 and the positive electrode current collector foil 11S are laminated and joined via an adhesive 70, as shown in FIG.
  • the adhesive 70 is electrically conductive.
  • the adhesive 70 is configured by, for example, containing conductive particles in a thermosetting resin.
  • a thermosetting resin for example, epoxy, acrylic, or the like is used as the resin.
  • the particles for example, gold, silver, copper, aluminum, nickel, carbon, or the like is used.
  • the positive current collector foil 11S of the positive electrode 11 and the joint portion 21r of the positive current collector plate 21 are joined together with the adhesive 70 interposed therebetween. Specifically, after laminating the positive electrode current collector foil 11S and the positive electrode current collector plate 21 with the adhesive 70 interposed therebetween, at least one of the positive electrode current collector foil 11S and the positive electrode current collector plate 21 is heated to remove the adhesive 70. Heat harden.
  • the manufacturing method of the battery 4 other than the above is the same as the manufacturing method of the battery 1 of the first embodiment.
  • the method for manufacturing the battery 4 of the fourth embodiment may be applied to the method for manufacturing the battery 2 of the second embodiment and the method for manufacturing the battery 3 of the third embodiment.
  • the positive collector plate 21 is provided with the second rigid portion 21q. Further, in the battery 4, the second rigid portion 21q of the positive electrode current collector plate 21 and the positive electrode current collector foil 11S are bonded via an adhesive 70 having conductivity. That is, the positive electrode current collector plate 21 and the positive electrode current collector foil 11S are indirectly bonded via the adhesive 70 without being limited to the configuration in which the positive electrode current collector plate 21 and the positive electrode current collector foil 11S are directly bonded.
  • the adhesive 70 of the battery 4 of the fourth embodiment may be applied to the battery 2 of the second embodiment or the battery 3 of the third embodiment.
  • the battery of the present invention is not limited to the configurations described in the embodiments, and can be appropriately configured based on the contents described in the claims.
  • the bonding of the current collecting member and the current collector in the present invention is not limited to ultrasonic bonding.
  • the current collecting member and the current collector in the present invention can be joined by laser welding, caulking joining, or heat welding joining.
  • the battery of the present invention is not limited to lithium ion batteries.
  • the battery of the present invention can be applied to, for example, nickel-metal hydride batteries and lead-acid batteries.
  • the battery of the present invention is not limited to secondary batteries.
  • the battery of the present invention can be applied to primary batteries.
  • the battery of the present invention is not limited to the configuration in which the charge/discharge body is sealed with a container and a lid.
  • the battery of the present invention can be applied to a configuration in which a charge/discharge body is sealed with a laminate film.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Cell Electrode Carriers And Collectors (AREA)
PCT/JP2022/005478 2022-02-10 2022-02-10 電池及び電池の製造方法 Ceased WO2023152916A1 (ja)

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JP2023579993A JPWO2023152916A1 (https=) 2022-02-10 2022-02-10
US18/726,485 US20250079654A1 (en) 2022-02-10 2022-02-10 Battery and method for producing battery
PCT/JP2022/005478 WO2023152916A1 (ja) 2022-02-10 2022-02-10 電池及び電池の製造方法
EP22925937.9A EP4478466A4 (en) 2022-02-10 2022-02-10 BATTERY AND METHOD FOR MANUFACTURING BATTERY
CN202280075146.5A CN118266130A (zh) 2022-02-10 2022-02-10 电池和电池的制造方法

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012054024A (ja) * 2010-08-31 2012-03-15 Hitachi Vehicle Energy Ltd 角形二次電池およびその製造方法
JP2012178235A (ja) * 2011-02-25 2012-09-13 Hitachi Vehicle Energy Ltd 二次電池
JP2015041589A (ja) * 2013-08-23 2015-03-02 トヨタ自動車株式会社 非水電解液電池およびその製造方法
JP2021192347A (ja) * 2020-06-05 2021-12-16 株式会社Ｇｓユアサ 蓄電素子の製造方法、及び、蓄電素子

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4491747B2 (ja) * 2007-07-23 2010-06-30 トヨタ自動車株式会社 電池

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012054024A (ja) * 2010-08-31 2012-03-15 Hitachi Vehicle Energy Ltd 角形二次電池およびその製造方法
JP2012178235A (ja) * 2011-02-25 2012-09-13 Hitachi Vehicle Energy Ltd 二次電池
JP2015041589A (ja) * 2013-08-23 2015-03-02 トヨタ自動車株式会社 非水電解液電池およびその製造方法
JP2021192347A (ja) * 2020-06-05 2021-12-16 株式会社Ｇｓユアサ 蓄電素子の製造方法、及び、蓄電素子

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP4478466A4 *

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CN118266130A (zh) 2024-06-28
JPWO2023152916A1 (https=) 2023-08-17

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