WO2020144904A1 - Corps joint de métaux dissemblables, borne externe d'électrode négative pour batteries secondaires l'utilisant, et batterie secondaire - Google Patents

Corps joint de métaux dissemblables, borne externe d'électrode négative pour batteries secondaires l'utilisant, et batterie secondaire Download PDF

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Publication number
WO2020144904A1
WO2020144904A1 PCT/JP2019/039761 JP2019039761W WO2020144904A1 WO 2020144904 A1 WO2020144904 A1 WO 2020144904A1 JP 2019039761 W JP2019039761 W JP 2019039761W WO 2020144904 A1 WO2020144904 A1 WO 2020144904A1
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WIPO (PCT)
Prior art keywords
negative electrode
external terminal
dissimilar metal
positive electrode
aluminum
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PCT/JP2019/039761
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English (en)
Japanese (ja)
Inventor
洋昭 増田
和昭 浦野
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ビークルエナジージャパン株式会社
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Priority to JP2020565581A priority Critical patent/JP7160947B2/ja
Publication of WO2020144904A1 publication Critical patent/WO2020144904A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/547—Terminals characterised by the disposition of the terminals on the cells
    • H01M50/55—Terminals characterised by the disposition of the terminals on the cells on the same side of the cell
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/552—Terminals characterised by their shape
    • H01M50/553—Terminals adapted for prismatic, pouch or rectangular cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/562—Terminals characterised by the material
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the present invention relates to a dissimilar metal bonded body, a negative electrode external terminal for a secondary battery using the same, and a secondary battery.
  • a secondary battery (hereinafter, also simply referred to as “battery”) has an external terminal (a negative electrode external terminal and a positive electrode external terminal) for charging and discharging.
  • an external terminal a negative electrode external terminal and a positive electrode external terminal
  • the terminals of the batteries are connected by a bus bar or the like.
  • the negative electrode external terminal, the positive electrode external terminal, the bus bar, and the like may be formed of different metal materials.
  • Patent Document 1 discloses a negative electrode terminal for a battery, which includes a clad portion formed by joining a first metal layer of an Al alloy and a second metal layer containing Ni and Cu, and a bus bar. Of the first metal layer and the second metal layer by making it difficult for heat resulting from resistance welding for joining to reach the joint region of the first metal layer and the second metal layer. It is described that the formation of an excessive intermetallic compound in Example 1 is suppressed, and peeling between the first metal layer and the second metal layer is less likely to occur.
  • Patent Document 2 a part of the aluminum material is melted by irradiating a laser beam from the side of the aluminum material having a relatively low melting point in a state where the copper material and the aluminum material are partially overlapped with each other. It is a dissimilar metal joined body having a structure in which a molten mixed part is formed by flowing into the inside of a material, and by forming a welded shape thin and shallow by reducing the input energy amount, the joint strength can be improved. Those that have been increased to strength are described.
  • Patent Document 1 the formation of a metal compound of aluminum and copper is suppressed by using a clad material of aluminum and a copper-nickel alloy.
  • a clad material of aluminum and a copper-nickel alloy there is room for improvement in that the production process is complicated because the clad material is required.
  • Patent Document 2 aluminum and copper are in contact with each other, and a part of aluminum is melted by a laser to flow into copper to form a melting and mixing portion.
  • the clad material as in Patent Document 1 is not used, the amount of the intermetallic compound of aluminum and copper is generated because it is melted and joined. This intermetallic compound is fragile and there is room for improvement in that the bonding strength is not stable.
  • the object of the present invention is to simplify the production process of a dissimilar metal joint, suppress the formation of intermetallic compounds, and stabilize the strength of the joint.
  • the dissimilar metal joined body of the present invention includes a Cu portion formed of pure copper or a copper alloy, an Al portion formed of pure aluminum or an aluminum alloy, and a mixed layer formed between the Cu portion and the Al portion. And the mixed layer has a structure in which copper and aluminum are diffused in a nickel layer.
  • the production process of a dissimilar metal joint can be simplified, the formation of intermetallic compounds can be suppressed, and the strength of the joint can be stabilized.
  • FIG. 2 is an exploded perspective view of the prismatic secondary battery of FIG. 1. It is a perspective view which shows the state which expanded the winding electrode group of FIG. 2 partially.
  • 3 is a perspective view showing a negative electrode external terminal of Example 1.
  • FIG. FIG. 5 is a schematic partial cross-sectional view of the negative electrode external terminal of FIG. 4.
  • FIG. 3 is a schematic enlarged cross-sectional view showing a joint portion of the dissimilar metal joint body of Example 1.
  • 5 is a perspective view showing a negative electrode external terminal of Example 2.
  • FIG. 8 is a schematic partial cross-sectional view of the negative electrode external terminal of FIG. 7. 8 is a perspective view showing a negative electrode external terminal of Example 3.
  • FIG. 10 is a schematic partial cross-sectional view of the negative electrode external terminal of FIG. 9.
  • the present invention relates to a secondary battery.
  • it is suitable for a lithium ion secondary battery.
  • FIG. 1 is an external perspective view of a flat wound secondary battery, which is an example of a prismatic secondary battery.
  • the outer surface of the flat wound secondary battery 100 is composed of a battery can 1, a battery lid 6, a negative electrode external terminal 12 and a positive electrode external terminal 14.
  • the battery lid 6 has a gas discharge valve 10 and a liquid injection plug 11. Further, the negative electrode external terminal 12 and the positive electrode external terminal 14 are arranged at both ends of the battery lid 6.
  • the negative electrode external terminal 12 includes a Cu portion 12b and an Al portion covered with the nickel layer 12d. An end portion (upper end portion in the drawing) of the negative electrode external terminal 12 has a nickel layer 12d.
  • FIG. 2 shows a state in which the flat wound secondary battery of FIG. 1 is disassembled.
  • the wound electrode group 3 is housed in the battery can 1.
  • the wound electrode group 3 is covered with the insulating protective film 2 in order to maintain insulation with the battery can 1.
  • the battery lid 6 has a liquid injection port 9 and a gas discharge valve 10. An injection plug 11 is fitted into the injection port 9. The injection stopper 11 is joined to the battery lid 6 by laser welding after injecting the electrolytic solution into the battery can 1 through the injection port 9. As a result, the liquid injection port 9 is sealed and the flat wound secondary battery 100 is sealed.
  • the battery lid 6 is provided with a negative electrode side through hole 26 and a positive electrode side through hole 46.
  • the battery can 1 has a side surface composed of a pair of opposite wide side surfaces 1b having a relatively large area and a pair of opposite narrow side surfaces 1c having a relatively small area, and a bottom surface 1d, and an opening 1a above it. Have.
  • the opening 1 a of the battery can 1 is sealed by the battery lid 6.
  • the sealing is by welding.
  • the battery lid 6 has a substantially rectangular flat plate shape.
  • the battery can 1 and the battery cover 6 form a battery container.
  • the charging and discharging of the wound electrode group 3 are performed via the positive electrode external terminal 14 and the negative electrode external terminal 12.
  • the gas exhaust valve 10 opens and gas is exhausted from the inside, so that the pressure in the battery container is reduced. As a result, the safety of the flat wound secondary battery 100 is ensured.
  • the wound electrode group 3 Since the wound electrode group 3 is wound in a flat shape, it has a pair of curved portions having a semicircular cross section and facing each other, and a flat surface portion continuously formed between the pair of curved portions. doing.
  • the wound electrode group 3 is inserted into the battery can 1 from one curved portion side so that the winding axis direction is along the lateral width direction of the battery can 1, and the other curved portion side is arranged on the upper opening side.
  • the positive electrode foil exposed portion 34c of the wound electrode group 3 is electrically connected to the positive electrode external terminal 14 provided on the battery lid 6 via the positive electrode current collector plate 44 (current collecting terminal).
  • the negative electrode foil exposed portion 32c of the wound electrode group 3 is electrically connected to the negative electrode external terminal 12 provided on the battery lid 6 via the negative electrode current collector plate 24 (current collecting terminal).
  • the winding electrode group 3 is charged and discharged via the positive electrode current collector plate 44 and the negative electrode current collector plate 24.
  • Each of the positive electrode current collector plate 44 and the negative electrode current collector plate 24 has a rectangular plate-shaped positive electrode current collector plate base 41 and a negative electrode current collector plate base 21 that are arranged to face the lower surface of the battery lid 6. Further, each of the positive electrode current collector plate 44 and the negative electrode current collector plate 24 has a positive electrode side connecting end portion 42 and a negative electrode side connecting end portion 22, respectively. The positive electrode side connection end portion 42 and the negative electrode side connection end portion 22 are bent at the side ends of the positive electrode current collector plate base portion 41 and the negative electrode current collector plate base portion 21, respectively.
  • the positive electrode collector plate base portion 41 and the negative electrode collector plate base portion 21 are respectively formed with a positive electrode side opening portion 43 and a negative electrode side opening portion 23 through which the positive electrode connecting portion 14a and the negative electrode connecting portion 12a are inserted.
  • the gasket 5 is sandwiched between the positive electrode external terminal 14 and the battery lid 6.
  • An insulating plate 7 is sandwiched between the positive electrode collector plate base 41 of the positive electrode collector plate 44 and the battery lid 6.
  • the gasket 5 is sandwiched between the negative electrode external terminal 12 and the battery lid 6.
  • An insulating plate 7 is sandwiched between the negative electrode collector plate base 21 of the negative electrode collector plate 24 and the battery lid 6. Electrical insulation is maintained by these structures.
  • the positive electrode external terminal 14 has a positive electrode connecting portion 14a and a welded joint portion 14f.
  • the negative electrode external terminal 12 has a negative electrode connecting portion 12a and a welded joint portion 12f.
  • the welded joints 14f and 12f are portions to be welded to a bus bar or the like.
  • the welded joints 14f and 12f have a rectangular parallelepiped block shape protruding upward from the battery lid 6, the lower surface thereof faces the surface of the battery lid 6, and the upper surface thereof is parallel to the battery lid 6 at a predetermined height position. It has the following configuration.
  • the positive electrode connecting portion 14a and the negative electrode connecting portion 12a have a cylindrical shape, and are inserted into the positive electrode side through hole 46 and the negative electrode side through hole 26 of the battery lid 6, respectively.
  • the positive electrode connecting portion 14a and the negative electrode connecting portion 12a pass through the battery lid 6 and project to the inner side of the battery can 1 than the positive electrode collector plate base 41 and the negative electrode collector plate base 21, respectively.
  • the tip of the protruding portion is crimped, and the positive electrode external terminal 14, the negative electrode external terminal 12, the positive electrode current collector plate 44, and the negative electrode current collector plate 24 are integrally fixed to the battery lid 6.
  • the positive electrode side connecting end portion 42 and the negative electrode side connecting end portion 22 are arranged so as to extend toward the bottom surface side along the wide surface of the battery can 1.
  • the positive electrode side connecting end portion 42 and the negative electrode side connecting end portion 22 are connected to the positive electrode foil exposed portion 34c and the negative electrode foil exposed portion 32c of the wound electrode group 3 so as to face each other and overlap each other.
  • a material for forming the positive electrode external terminal 14 and the positive electrode current collector plate 44 is, for example, an aluminum alloy.
  • a material for forming the negative electrode external terminal 12 and the negative electrode current collector plate 24 for example, a copper alloy can be used.
  • the material for forming the insulating plate 7 and the gasket 5 include resin materials having an insulating property such as polybutylene terephthalate, polyphenylene sulfide, and perfluoroalkoxy fluororesin.
  • a non-aqueous electrolytic solution in which a lithium salt such as lithium hexafluorophosphate (LiPF 6 ) is dissolved in a carbonate ester organic solvent such as ethylene carbonate is used. it can.
  • the insulating protective film 2 is wound around the wound electrode group 3 with the direction along the flat surface of the wound electrode group 3 and the direction orthogonal to the winding axis direction of the wound electrode group 3 as the central axis direction. ing.
  • the insulating protective film 2 is made of, for example, a single sheet or a plurality of film members made of synthetic resin such as PP (polypropylene), and is parallel to the flat surface of the winding electrode group 3 and orthogonal to the winding axis direction. It has such a length that it can be wound around the direction of winding.
  • FIG. 3 is a perspective view showing a state where the wound electrode group of FIG. 2 is partially developed.
  • the wound electrode group 3 is configured by sandwiching the separators 33 and 35 between the negative electrode 32 (negative electrode) and the positive electrode 34 (positive electrode) and winding them in a flat shape.
  • the outermost electrode of the wound electrode group 3 is the negative electrode 32, and the separator 35 is further wound around the negative electrode 32.
  • the separators 33 and 35 have a role of insulating the positive electrode 34 and the negative electrode 32 from each other.
  • the portion of the negative electrode 32 coated with the negative electrode mixture layer 32b is larger in the width direction than the portion of the positive electrode 34 coated with the positive electrode mixture layer 34b. As a result, the portion coated with the positive electrode mixture layer 34b is always sandwiched between the portions coated with the negative electrode mixture layer 32b.
  • the positive electrode electrode 34 has a positive electrode active material mixture on both surfaces of a positive electrode electrode foil, which is a positive electrode current collector, and a positive electrode active material mixture is not applied to one end in the width direction of the positive electrode electrode foil.
  • the exposed portion 34c is provided.
  • the negative electrode 32 has a negative electrode active material mixture on both sides of a negative electrode electrode foil, which is a negative electrode current collector, and does not apply the negative electrode active material mixture to the other end in the width direction of the positive electrode electrode foil.
  • the exposed portion 32c is provided.
  • the positive electrode foil exposed portion 34c and the negative electrode foil exposed portion 32c are regions where the metal surface of the electrode foil is exposed, and are wound so as to be arranged at positions on one side and the other side in the winding axis direction.
  • the positive electrode foil exposed portion 34c and the negative electrode foil exposed portion 32c are bundled in a plane portion and connected by welding or the like. Although the separators 33 and 35 are wider than the portion coated with the negative electrode mixture layer 32b in the width direction, the separators 33 and 35 are wound at the positions where the metal foil surfaces at the ends are exposed at the positive electrode foil exposed portion 34c and the negative electrode foil exposed portion 32c. Since it is rotated, it does not hinder the bundling and welding.
  • the negative electrode 32 10 parts by mass of polyvinylidene fluoride (hereinafter referred to as PVDF) as a binder was added to 100 parts by mass of the amorphous carbon powder as the negative electrode active material, and N as a dispersion solvent. -Methylpyrrolidone (hereinafter referred to as NMP) was added to prepare a kneaded negative electrode mixture. This negative electrode mixture was applied onto both surfaces of a copper foil (negative electrode foil) having a thickness of 10 ⁇ m, leaving a welded portion (negative electrode uncoated portion). Then, through the steps of drying, pressing, and cutting, a negative electrode 32 having a thickness of 70 ⁇ m (total thickness of both surfaces) of the negative electrode active material coating portion containing no copper foil was obtained.
  • PVDF polyvinylidene fluoride
  • NMP -Methylpyrrolidone
  • amorphous carbon is used as the negative electrode active material
  • the present invention is not limited to this, and natural graphite capable of inserting and releasing lithium ions and various artificial graphites.
  • Materials, carbonaceous materials such as coke, compounds such as Si and Sn (for example, SiO, TiSi 2 etc.), or composite materials thereof may be used, and the particle shape thereof may be scaly, spherical, fibrous, lumpy, etc. It is not particularly limited.
  • the positive electrode 34 10 parts by mass of scaly graphite as a conductive material and 10 parts by mass of PVDF as a binder were added to 100 parts by mass of lithium manganate (chemical formula LiMn 2 O 4 ) as a positive electrode active material. Then, NMP as a dispersion solvent was added thereto and kneaded to prepare a positive electrode mixture.
  • This positive electrode mixture was applied on both surfaces of an aluminum foil (positive electrode foil) having a thickness of 20 ⁇ m, leaving a welded portion (positive electrode uncoated portion). After that, through the steps of drying, pressing, and cutting, a positive electrode 31 having a thickness of 90 ⁇ m (total thickness of both surfaces) of the positive electrode active material coating portion containing no aluminum foil was obtained.
  • lithium manganate as the positive electrode active material
  • PVDF polytetrafluoroethylene
  • polyethylene polyethylene
  • polystyrene polystyrene
  • polybutadiene Polymers such as butyl rubber, nitrile rubber, styrene butadiene rubber, polysulfide rubber, nitrocellulose, cyanoethyl cellulose, various latexes, acrylonitrile, vinyl fluoride, vinylidene fluoride, propylene fluoride, chloroprene fluoride, acrylic resins and the like.
  • PTFE polytetrafluoroethylene
  • Polymers such as butyl rubber, nitrile rubber, styrene butadiene rubber, polysulfide rubber, nitrocellulose, cyanoethyl cellulose, various latexes, acrylonitrile, vinyl fluoride, vinylidene fluoride, propylene fluoride, chloroprene fluoride, acrylic resins and the like.
  • a mixture or the like can be used
  • the shaft core for example, one formed by winding a resin sheet having higher bending rigidity than any of the positive electrode foil 31a, the negative electrode foil 32a, and the separator 33 can be used.
  • FIG. 4 is an external perspective view of a negative electrode external terminal composed of the dissimilar metal bonded body of the present embodiment.
  • FIG. 5 is a cross-sectional view of the negative electrode external terminal of FIG.
  • the negative electrode external terminal 12 has a cylindrical negative electrode connecting portion 12a and a rectangular parallelepiped welded joint portion 12f.
  • the welded joint 12f is composed of a Cu portion 12b and an Al portion 12c.
  • the Cu portion 12b is made of pure copper or a copper alloy.
  • the Al portion 12c is made of pure aluminum or an aluminum alloy.
  • the negative electrode connecting portion 12a is connected to the inside of the battery.
  • the Al portion 12c is a portion welded to a bus bar or the like.
  • the Al part 12c is covered with a nickel layer 12d.
  • the nickel layer 12d is made of pure nickel or a nickel alloy.
  • a mixed layer 12e is formed between the Cu portion 12b and the Al portion 12c.
  • the mixed layer 12e is a region formed by solid phase bonding. In the mixed layer 12e, three atoms of aluminum, copper, and nickel are in a state of atomic diffusion. The nickel layer 12d may remain in the vicinity of the mixed layer 12e.
  • the reason why the Al portion 12c is covered with the nickel layer 12d is that if aluminum and copper are directly joined, they will be corroded by moisture or the like.
  • a method of plating nickel on the copper side is generally used, but in this embodiment, the nickel layer is formed by plating on the aluminum side.
  • the first zincate treatment is performed to obtain a uniform thickness of 0.3 nm.
  • a thin oxide film is formed, and in the second zincate treatment, this thin and uniform oxide film is dissolved in a short time and the zinc substitution reaction proceeds (Surface Technology Vol.64, No. 12, 2013, pp. 645-649 Citations of some documents in).
  • the nickel layer 12d (external nickel layer) located on the upper surface of FIG. 5 has a thickness of 1 ⁇ m or more and 20 ⁇ m or less.
  • the thickness of the outer nickel layer is preferably about 5 ⁇ m, but may be about 1 ⁇ m as long as aluminum is not exposed. That is, the thickness of the outer nickel layer is more preferably 1 ⁇ m or more and 10 ⁇ m or less, and particularly preferably 3 to 7 ⁇ m.
  • the outer nickel layer is formed in a portion of the interface of the Al portion 12c where the mixed layer 12e is not formed.
  • the surface of aluminum is subjected to a zincate treatment, so it is considered that zinc is contained in the interface between the outer surface nickel layer and the Al portion 12c.
  • the nickel-plated aluminum material and copper material are solid-phase bonded by thermocompression bonding.
  • the temperature at which heat is applied is about 600° C. at most, which is lower than the melting point of aluminum.
  • the pressure is as high as not exceeding the shear strength of the base material, but even if the pressure is low, it is possible to join by uniformly pressing the entire surface. Specifically, it is preferable that the pressure is higher than 0 MPa (that is, more than 0 MPa) and is several MPa or less, and more preferably 0.2 MPa or more and 1 MPa or less.
  • thermocompression bonding atoms are diffused near the bonding interface, and the bonding strength is stabilized.
  • FIG. 6 schematically shows an atomic diffusion state in the vicinity of the bonding interface of the dissimilar metal bonded body of this example.
  • a mixed layer 12e is formed at the joint between the Cu portion 12b and the Al portion 12c.
  • the mixed layer 12e is formed by diffusing aluminum atoms 16 and copper atoms 17 in the nickel layer before joining.
  • the Cu portion 12b contains nickel atoms 18.
  • the Cu portion 12b may also contain aluminum atoms 16.
  • the Al portion 12c contains nickel atoms 18.
  • the Al portion 12c may also contain copper atoms 17. Because of solid phase bonding (thermal diffusion), there is no melt mixing part or compound layer.
  • the three atoms including the mixed layer 12e are in a state of atomic diffusion, the concentration of aluminum atoms 16 gradually decreases, and the concentration of copper atoms 17 gradually increases. .. Further, the concentration of the nickel atoms 18 gradually decreases from the central portion of the mixed layer 12e to the Cu portion side and the Al portion side. That is, it is a concentration gradient layer.
  • EDX Energy dispersive X-ray analysis
  • a cross-section sample is prepared by cutting the joined dissimilar metal joint (terminal), and elemental analysis reveals three elements, aluminum, nickel and copper, in the mixed layer near the joint interface.
  • the zinc element replaced by the zincate treatment may remain, and zinc may be detected in addition to the three elements in the highly accurate analysis.
  • zinc may be contained in the interface between the Al portion 12c and the mixed layer 12e. As described above, it is considered that the zinc remaining at the interface may move to the mixed layer 12e or the Al portion 12c due to the diffusion that occurs in the solid phase bonding. Therefore, in this specification, regardless of the distribution of zinc after diffusion, it is assumed that zinc is contained in the region of the mixed layer 12e in a broad sense.
  • the present embodiment is characterized by using a nickel layer formed on the Al portion. Therefore, for example, it is possible to distinguish from other configurations such as forming a nickel layer only on the clad material or the Cu portion.
  • the first feature is that the nickel layer is formed on the Al part other than the joint surface between the Al part and the Cu part. When only the clad material or the Cu portion side is plated, there is no nickel layer in the Al portion other than the joint portion.
  • the formation of the nickel layer on the Al portion other than the bonding surface is one of the points for distinguishing this embodiment from other configurations.
  • the second feature is the removal of the oxide film on the Al part by the zincate treatment.
  • the oxide film remains on the Al portion, it can be distinguished by examining the presence or absence of the oxide film.
  • the oxide film can be examined by X-ray electron spectroscopy (X-Ray Photoelectron Spectroscopy: XPS).
  • the secondary battery is configured by using the terminal, which is the above-mentioned dissimilar metal bonded body, as the negative electrode external terminal 12 of FIG.
  • the negative electrode connecting portion 12a of FIG. 4 is formed and used to connect the negative electrode terminal and the negative electrode current collector plate.
  • the negative electrode connecting portion 12a is fixed by caulking the tip of the rivet, when it is formed of a copper alloy, nickel is peeled off when nickel is plated, and the nickel is mixed into the battery as a foreign substance. From this point as well, it is desirable that the nickel layer is outside the battery as in the present embodiment.
  • the surface of the busbar joint of the negative electrode external terminal and the positive electrode external terminal can be made of the same material. Therefore, if the bus bar material is also made of aluminum alloy, the same material can be welded and the joining becomes easy.
  • the negative electrode external terminal which is a dissimilar metal bonded body, has a structure in which the nickel layer is formed only at the bonded portion with the Cu portion of the Al portion and the bonded portion with the bus bar. Note that, in the following description, description of items that are common to the first embodiment will be omitted.
  • FIG. 7 is an external perspective view of the negative electrode external terminal of this embodiment.
  • FIG. 8 is a partial cross-sectional view of the negative electrode external terminal of FIG.
  • Example 1 As shown in FIG. 5, the plating of the Al portion 12c of the negative electrode external terminal 12 (nickel layer 12d and mixed layer 12e) is applied to the entire surface including the side surface.
  • the nickel layer 12d is not provided on the side surface of the Al portion 12c forming the welded joint 12f. Only the upper surface of the welded joint 12f (joint with the bus bar) and the joint with the Cu portion 12b (mixed layer 12e) are plated.
  • a plate-shaped aluminum roll is first plated and punched with a press or the like to form a terminal shape. As a result, the side surface is exposed to the aluminum.
  • each terminal member is plated to form the nickel layer including the side surface.
  • the process control is less than that of the first embodiment, and the process can be simplified. Since the nickel layer is provided on the joint surface as in the case of the first embodiment, there is no change in the subsequent joining step with the Cu portion.
  • the negative electrode external terminal which is a dissimilar metal bonded body, has a structure in which the nickel layer is also formed on the Cu portion. Note that, in the following description, description of items that are common to the first embodiment will be omitted.
  • FIG. 9 is a perspective view showing the negative electrode external terminal of this embodiment.
  • FIG. 10 is a partial cross-sectional view of the negative electrode external terminal of FIG.
  • a nickel layer 12d is provided on the entire surface of the welded joint 12f except the lower surface.
  • the nickel layer 12d is provided on the Cu portion 12b as well, since the joint surface between the Al portion 12c and the Cu portion 12b is composed of the same nickel layer 12d, the adhesiveness is improved and the joining is facilitated. As a result, the conditions of heat and pressure at the time of joining are relaxed, and the effect of facilitating the process can be expected. As a result, the outer nickel layer is also formed on the side surface of the Cu portion 12b.
  • the nickel layer 12d may be provided on the lower surface of the welded joint 12f, but it is preferable to remove the lower surface from the viewpoint of preventing a short circuit.
  • the nickel layer 12d is provided also on the upper surface portion (joint portion with the bus bar) of the Al portion 12c, but the present invention is not limited to the joint portion formed by solid-state joining of aluminum and copper.
  • the main purpose is to stabilize the strength, and the nickel layer 12d may not be provided on the upper surface of the Al portion 12c.
  • the manufacturing process can be simplified and can be easily made.
  • the surface of the negative electrode external terminal can be made of the same aluminum material as the positive electrode external terminal surface.
  • the same aluminum material can be used for the bus bar for electrically connecting the batteries, which facilitates welding.
  • 1 Battery can, 1a: Opening part, 1b: Wide side face, 1c: Narrow side face, 1d: Bottom face, 2: Insulation protective film, 3: Winding electrode group, 5: Gasket, 6: Battery lid, 7: Insulation Plate, 9: Injection port, 10: Gas discharge valve, 11: Injection plug, 12: Negative electrode external terminal, 12a: Negative electrode connection part, 12b: Cu part, 12c: Al part, 12d: Nickel layer, 12e: Mixing Layer, 14: Positive electrode external terminal, 14a: Positive electrode connecting part, 16: Aluminum atom, 17: Copper atom, 18: Nickel atom, 21: Negative electrode collector plate base part, 22: Negative electrode side connecting end part, 23: Negative electrode side opening Part, 24: negative electrode current collector plate, 26: negative electrode side through hole, 32: negative electrode, 32a: negative electrode foil, 32b: negative electrode mixture layer, 32c: negative electrode foil exposed part, 33, 35: separator, 34: positive electrode , 34a: positive electrode foil, 34b: positive electrode mixture

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)

Abstract

La présente invention simplifie le procédé de production d'un corps joint de métaux dissemblables et supprime la formation d'un composé intermétallique, stabilisant ainsi la solidité d'une partie jointe. Elle concerne un corps joint de métaux dissemblables qui comprend une partie de Cu qui est formée de cuivre pur ou d'un alliage de cuivre, une partie d'Al qui est formée d'aluminium pur ou d'un alliage d'aluminium, et une couche mélangée qui est formée entre la partie de Cu et la partie d'Al, et qui est configurée de sorte que la couche mélangée a une configuration dans laquelle le cuivre et l'aluminium sont diffusés dans une couche de nickel.
PCT/JP2019/039761 2019-01-09 2019-10-09 Corps joint de métaux dissemblables, borne externe d'électrode négative pour batteries secondaires l'utilisant, et batterie secondaire WO2020144904A1 (fr)

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EP4092166A1 (fr) * 2021-05-20 2022-11-23 Prime Planet Energy & Solutions, Inc. Composant de borne, batterie secondaire et procédé de fabrication d'un composant de borne
WO2024016911A1 (fr) * 2022-07-21 2024-01-25 宁德时代新能源科技股份有限公司 Élément de batterie, batterie et dispositif électrique

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JP2012138306A (ja) * 2010-12-27 2012-07-19 Toshiba Corp 接合体、接合体の製造方法および電池パック
WO2012133654A1 (fr) * 2011-03-30 2012-10-04 株式会社Ｎｅｏｍａｘマテリアル Borne d'électrode négative et organe de capot pour batteries à lithium-ion et batterie à lithium-ion
JP2015088443A (ja) * 2013-09-25 2015-05-07 株式会社Ｎｅｏｍａｘマテリアル 電池用端子、電池用端子の製造方法および電池

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WO2012102160A1 (fr) * 2011-01-27 2012-08-02 株式会社Ｎｅｏｍａｘマテリアル Plaque de raccordement pour un terminal cellulaire et procédé de fabrication d'une plaque de raccordement pour un terminal cellulaire
KR102026044B1 (ko) * 2017-03-24 2019-09-26 히타치 긴조쿠 가부시키가이샤 클래드재의 제조 방법

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JP2012138306A (ja) * 2010-12-27 2012-07-19 Toshiba Corp 接合体、接合体の製造方法および電池パック
WO2012133654A1 (fr) * 2011-03-30 2012-10-04 株式会社Ｎｅｏｍａｘマテリアル Borne d'électrode négative et organe de capot pour batteries à lithium-ion et batterie à lithium-ion
JP2015088443A (ja) * 2013-09-25 2015-05-07 株式会社Ｎｅｏｍａｘマテリアル 電池用端子、電池用端子の製造方法および電池

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4092166A1 (fr) * 2021-05-20 2022-11-23 Prime Planet Energy & Solutions, Inc. Composant de borne, batterie secondaire et procédé de fabrication d'un composant de borne
JP2022178618A (ja) * 2021-05-20 2022-12-02 プライムプラネットエナジー＆ソリューションズ株式会社 端子、二次電池および端子の製造方法
JP7373523B2 (ja) 2021-05-20 2023-11-02 プライムプラネットエナジー＆ソリューションズ株式会社 端子、二次電池および端子の製造方法
WO2024016911A1 (fr) * 2022-07-21 2024-01-25 宁德时代新能源科技股份有限公司 Élément de batterie, batterie et dispositif électrique

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