WO2013024542A1 - Accumulateur cylindrique - Google Patents

Accumulateur cylindrique Download PDF

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Publication number
WO2013024542A1
WO2013024542A1 PCT/JP2011/068691 JP2011068691W WO2013024542A1 WO 2013024542 A1 WO2013024542 A1 WO 2013024542A1 JP 2011068691 W JP2011068691 W JP 2011068691W WO 2013024542 A1 WO2013024542 A1 WO 2013024542A1
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WO
WIPO (PCT)
Prior art keywords
metal
secondary battery
negative electrode
battery
current collecting
Prior art date
Application number
PCT/JP2011/068691
Other languages
English (en)
Japanese (ja)
Inventor
右一 江幡
勇人 小口
磯野　栄一
Original Assignee
日立ビークルエナジー株式会社
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 日立ビークルエナジー株式会社 filed Critical 日立ビークルエナジー株式会社
Priority to PCT/JP2011/068691 priority Critical patent/WO2013024542A1/fr
Priority to PCT/JP2012/070248 priority patent/WO2013024774A1/fr
Priority to JP2013528985A priority patent/JP5747082B2/ja
Publication of WO2013024542A1 publication Critical patent/WO2013024542A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/64—Carriers or collectors
    • H01M4/66—Selection of materials
    • H01M4/665—Composites
    • H01M4/667—Composites in the form of layers, e.g. coatings
    • 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
    • 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
    • H01M50/534—Electrode connections inside a battery casing characterised by the material 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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0422—Cells or battery with cylindrical casing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0431—Cells with wound or folded electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present invention relates to a cylindrical secondary battery, and more particularly to a cylindrical secondary battery in which a current collecting member connected to one of positive and negative electrodes and a battery can are joined by welding or the like.
  • a cylindrical secondary battery typified by a lithium secondary battery or the like contains an electrode group in which a positive electrode and a negative electrode are wound around a shaft core via a separator in a cylindrical battery can, An electrolyte is injected and configured.
  • the positive and negative electrodes have positive and negative active materials coated on both sides of the positive and negative metal foils, respectively.
  • Each of the positive and negative metal foils has a number of positive and negative electrode tabs (hereinafter referred to as “electrode tabs”) arranged at a predetermined pitch along one side edge in the longitudinal direction.
  • the positive and negative electrode tabs are respectively wound around the outer periphery of a substantially ring-shaped positive and negative current collecting member, and are joined to each current collecting member by ultrasonic welding or the like with the electrode tabs superimposed. .
  • One of the positive and negative current collecting members is joined to a battery lid disposed on the top of the battery can, and the other is joined to the bottom of the battery can by, for example, resistance welding.
  • the battery can is made of iron and the current collecting member is made of copper
  • the connecting force formed by nickel is usually interposed between the battery can and the current collecting member because the joining force by welding is insufficient. By doing so, a sufficient bonding force is obtained.
  • an opening through which the shaft core is inserted is provided in the center of the current collecting member, and connection leads extending on both sides of the opening are closed on the bottom surface side of the current collecting member.
  • a cylindrical secondary battery to be joined is known. In such a cylindrical secondary battery, a portion corresponding to the opening of the axial center of the connection lead is pressed and welded to the bottom of the battery can with an electrode rod for resistance welding (see, for example, Patent Document 1). .
  • a cylindrical secondary battery has an electrode group in which a positive electrode and a negative electrode are wound with a separator interposed around a cylindrical shaft core and an opening on the upper side.
  • the battery can in which the electrode group is accommodated and the electrolyte is injected, the battery lid disposed on the upper side of the battery can, and the bottom of the battery can and the lower end of the shaft core, And a current collecting member connected to the battery can and connected to one electrode tab of the positive electrode and the negative electrode, wherein the current collecting member is a first electrode to which one of the positive electrode tab and the negative electrode is connected.
  • the first metal is formed of a metal material including one of the connected positive electrode and negative electrode, and the second metal This metal is preferably formed of a metal material having a larger bonding force with the bottom of the battery can than the first metal.
  • the second metal is diffusion-fused over the entire surface on the one surface side of the first metal.
  • the second metal in the cylindrical secondary battery according to any one of the first to third aspects, preferably has a thickness of 0.2 to 0.7 mm. .
  • the first metal in the cylindrical secondary battery according to any one of the first to fourth aspects, is formed of copper or a copper alloy, and the second metal is nickel. Preferably it is formed.
  • the current collecting member in the cylindrical secondary battery according to any one of the first to fifth aspects, has a cylindrical recess into which the tip end side of the shaft core is inserted at the center. It is preferably formed and joined to the bottom of the battery can in the cylindrical recess.
  • the cylindrical recess of the current collecting member is formed with a plurality of protrusions that contact the outer periphery of the shaft core.
  • a gap that is spaced from the outer periphery of the shaft core is formed between the protrusions of the cylindrical recess, and the cylindrical recess. It is preferable that an opening penetrating from the inside to the outside of the cylindrical recess is formed between the protrusions.
  • the current collecting member has a substantially disk-shaped peripheral edge, and the electrode tab has a disk shape. It is preferable that it is joined to the 2nd metal in the peripheral part.
  • the current collecting member has a substantially disc-shaped peripheral portion where the second metal is not formed. The electrode tab is preferably joined to the first metal at the peripheral edge of the disk shape.
  • the current collecting member is formed of a clad material in which the first metal and the second metal diffused and fused to the first metal are integrated.
  • the contact area between the first metal and the second metal can be increased. Therefore, the contact resistance value of the joint portion of the first and second metals can be reduced. Thereby, the thickness of the expensive second metal can be reduced, and the cost can be reduced.
  • FIG. 1 is a cross-sectional view of an embodiment of a cylindrical secondary battery according to the present invention.
  • FIG. 2 is an exploded perspective view of the cylindrical secondary battery shown in FIG. 1.
  • FIG. 2 is an enlarged cross-sectional view of a periphery of a negative electrode current collecting member illustrated in FIG. 1.
  • A) is sectional drawing of the negative electrode current collection member illustrated in FIG. 3
  • B) is the bottom view. Sectional drawing for demonstrating the method of welding a negative electrode current collection member to the can bottom of a battery can.
  • FIG. 8 is a characteristic diagram showing the rate of change in resistance value with respect to the thickness of a nickel material, which is a first-order differentiation of FIG. 7.
  • (A) is sectional drawing of the negative electrode current collection member illustrated by FIG. 9,
  • (B) is the bottom view.
  • (A) is sectional drawing of the negative electrode current collection member illustrated in FIG. 11, (B) is the bottom view.
  • (A) is sectional drawing of the negative electrode current collection member illustrated by FIG. 13, (B) is the bottom view.
  • FIG. 1 is an enlarged cross-sectional view showing an embodiment of a cylindrical secondary battery of the present invention.
  • the cylindrical secondary battery 1 is, for example, a lithium ion secondary battery.
  • the cylindrical secondary battery 1 includes a cylindrical battery can 2 and a battery container 3 formed of a hat-type battery lid 3 that seals the upper portion of the battery can 2. It is accommodated and infused with a non-aqueous electrolyte 5.
  • the cylindrical battery can 2 is made of, for example, iron (SPCC), and nickel plating is applied to both the inner and outer surfaces.
  • SPCC iron
  • a groove 2 a protruding to the inside of the battery can 2 is formed on the opening 2 b provided on the upper end side.
  • An electrode group 10 is disposed inside the battery can 2.
  • the electrode group 10 includes a cylindrical shaft core 15 having a hollow portion along the axial direction, and a positive electrode and a negative electrode wound around the shaft core 15 via a separator.
  • FIG. 2 is an exploded perspective view of the cylindrical secondary battery 1 shown in FIG.
  • the electrode group 10 has a structure in which a positive electrode 11, a negative electrode 12, and a separator 13 are wound around an axis 15.
  • the outermost periphery of the electrode group 10 is wound so as to be the negative electrode 12 and the separator 13 on the outer periphery thereof.
  • a side edge of the outermost separator 13 is fixed to the inner separator 13 by an adhesive tape 19.
  • the positive electrode 11 includes a positive electrode metal foil that is formed of an aluminum foil and has a long shape, and a positive electrode mixture treatment portion 11a in which a positive electrode mixture is applied to both surfaces of the positive electrode metal foil.
  • the upper side edge extending in the longitudinal direction of the positive electrode metal foil is a positive electrode mixture untreated portion where the positive electrode mixture is not applied and the aluminum foil is exposed.
  • a number of positive electrode tabs 16 protruding in parallel with the axial direction of the shaft core 15 are integrally formed at equal intervals in the positive electrode mixture untreated portion.
  • the positive electrode mixture is composed of a positive electrode active material, a positive electrode conductive material, and a positive electrode binder.
  • the positive electrode active material is preferably lithium oxide. Examples include lithium cobaltate, lithium manganate, lithium nickelate, lithium composite oxide (lithium oxide containing two or more selected from cobalt, nickel, and manganese).
  • the positive electrode binder can bind the positive electrode active material and the positive electrode conductive material, and can bind the positive electrode mixture and the positive electrode current collector, and must be significantly deteriorated by contact with the non-aqueous electrolyte 5.
  • the positive electrode binder include polyvinylidene fluoride (PVDF) and fluororubber.
  • PVDF polyvinylidene fluoride
  • fluororubber An example of the coating thickness of the positive electrode mixture is about 40 ⁇ m on one side.
  • the negative electrode 12 includes a negative electrode metal foil that is formed of a copper foil and has a long shape, and a negative electrode mixture treatment portion 12a in which a negative electrode mixture is applied to both surfaces of the negative electrode metal foil.
  • the lower side edge extending in the longitudinal direction of the negative electrode metal foil is a negative electrode mixture untreated portion where the negative electrode mixture is not applied and the copper foil is exposed.
  • a large number of negative electrode tabs 17 extending in parallel to the axial direction of the shaft core 15 and in the direction opposite to the positive electrode tab 16 are integrally formed at equal intervals. Yes.
  • the negative electrode mixture includes a negative electrode active material, a negative electrode binder, and a thickener.
  • the negative electrode mixture may have a negative electrode conductive material such as acetylene black.
  • As the negative electrode active material it is preferable to use graphitic carbon, particularly artificial graphite.
  • An example of the coating thickness of the negative electrode mixture is about 40 ⁇ m on one side.
  • the separator 13 is formed of, for example, a porous film made of a composite material of polypropylene (PP) and polyethylene (PE) having a thickness of 40 ⁇ m.
  • PP polypropylene
  • PE polyethylene
  • a substantially ring-shaped positive electrode current collecting member 31 is press-fitted on the inner peripheral side of the upper end portion of the hollow cylindrical shaft core 15.
  • the positive electrode current collecting member 31 is made of, for example, aluminum. All of the positive electrode tabs 16 of the positive electrode 11 are joined to the ring-shaped peripheral side surface of the positive electrode current collecting member 31 by ultrasonic welding or the like. When laser welding the positive electrode tab 16 to the positive electrode current collecting member 31, the positive electrode tab 16 is disposed on the ring-shaped peripheral side surface of the positive electrode current collecting member 31, and the ribbon 41 is wound around the positive electrode tab 16 on the ribbon 41. Irradiating with laser.
  • a substantially ring-shaped negative electrode current collecting member 20 is press-fitted and attached to the lower end portion of the shaft core 15.
  • the negative electrode current collecting member 20 is made of, for example, copper.
  • the negative electrode tabs 17 of the negative electrode 12 are all joined to the ring-shaped peripheral side surface of the negative electrode current collecting member 20 by ultrasonic welding or the like. When the negative electrode tab 17 is laser-welded to the negative electrode current collector member 20, the negative electrode tab 17 is disposed on the ring-shaped peripheral side surface of the negative electrode current collector member 20, and the ribbon 42 is wound on the negative electrode tab 17 on the ribbon 42. Irradiating with laser.
  • the lower surface of the negative electrode current collecting member 20 is joined to the can bottom 2 c of the battery can 2. Details of the structure of the negative electrode current collecting member 20 and the method of joining the battery can 2 to the can bottom 2c will be described later.
  • a flexible positive electrode conductive lead 32 formed by laminating a plurality of aluminum foils is joined to the upper surface of the positive electrode current collecting member 31 by ultrasonic welding or the like.
  • the positive electrode conductive lead 32 can flow a large current by laminating and integrating a plurality of aluminum foils, and is provided with flexibility.
  • a conductive connection plate 33 is disposed on the upper part of the positive electrode current collecting member 31.
  • the battery lid 3 is fixed to the peripheral edge of the conductive connection plate 33 by caulking.
  • the conductive connection plate 33 is made of aluminum or an aluminum alloy and has a substantially disk shape.
  • a substantially circular safety valve is formed in the substantially central portion of the conductive connection plate 33 to release a gas generated in the cylindrical secondary battery 1 in the case of overcharge or the like.
  • the safety valve is formed by a portion that is crushed so as to form a substantially V-shaped groove by pressing and is formed into a thin portion.
  • the other end of the positive electrode conductive lead 32 having one end bonded to the positive electrode current collecting member 31 is bonded to the lower surface of the conductive connection plate 33 by laser welding or the like.
  • a gasket 34 is provided to cover the peripheral edge of the conductive connection plate 33.
  • the gasket 34 is made of, for example, a pull fluoroalkoxy fluororesin (PFA).
  • PFA pull fluoroalkoxy fluororesin
  • the battery lid 3 caulked to the peripheral edge of the conductive connecting plate 33 is fixed to the battery can 2 together with the gasket 34 by caulking.
  • the conductive connecting plate 33 with the battery lid 3 crimped therein is accommodated in the opening of the gasket 34 and the gasket 34 is crimped together with the peripheral edge of the opening 2b of the battery can 2 by pressing, as shown in FIG. Then, a battery container in which the battery cover 3, the conductive connection plate 33, the gasket 34, and the battery cover 3 are integrated by caulking is produced.
  • a predetermined amount of non-aqueous electrolyte 5 is injected into the battery can 2.
  • the nonaqueous electrolytic solution 5 it is preferable to use a solution in which a lithium salt is dissolved in a carbonate solvent.
  • the lithium salt include lithium fluorophosphate (LiPF 6 ), lithium fluoroborate (LiBF 6 ), and the like.
  • carbonate solvents include ethylene carbonate (EC), dimethyl carbonate (DMC), propylene carbonate (PC), methyl ethyl carbonate (MEC), or a mixture of solvents selected from one or more of the above solvents. Can be mentioned.
  • a plurality of openings 15 a are formed to allow the nonaqueous electrolyte solution to flow out from the hollow portion of the shaft core 15 to the outside of the shaft core 15 when the nonaqueous electrolyte solution 5 is injected.
  • the electrode group 10 in which the negative electrode current collecting member 20 is press-fitted into the lower end portion of the shaft core 15 and the positive electrode current collecting member 31 is press-fitted into the upper end portion of the shaft core 15 is accommodated in the battery can 2, and the negative electrode current collecting member 20 is The battery can 2 is joined to the bottom 2 c of the battery can 2, and the non-aqueous electrolyte 5 is injected into the battery can 2.
  • the positive electrode current collecting member 31 and the conductive connecting plate 33 on which the battery lid 3 is caulked are connected by the positive electrode conductive lead 32.
  • the cylindrical secondary battery 1 shown in FIG. 1 is manufactured by caulking the conductive connection plate 33 and the battery lid 3 to the peripheral edge of the opening 2b on the upper side of the battery can 2 via the gasket 34. Is done.
  • FIG. 3 is an enlarged cross-sectional view of the negative electrode current collecting member 20 and the periphery of the can bottom 2c of the battery can 2 shown in FIG. 4A is a cross-sectional view of the negative electrode current collecting member 20 shown in FIG. 3, and FIG. 4B is a bottom view thereof.
  • the negative electrode current collecting member 20 has a ring-shaped peripheral wall on the outer peripheral side and the inner peripheral side, and is formed in a substantially cylindrical shape as a whole. That is, a cylindrical recess 29 having a ring-shaped inner peripheral side wall 20a is formed at the center, and a structure having a ring-shaped outer peripheral side wall 20b on the outer peripheral side.
  • a substantially disk-shaped intermediate flat portion 20c is formed between the inner peripheral side wall 20a and the outer peripheral side wall 20b.
  • the inner peripheral side wall 20a is formed to rise substantially vertically from the bottom 29a of the cylindrical recess 29 toward the intermediate flat part 20c
  • the outer peripheral side wall 20b is formed to fall substantially vertically on the outer peripheral edge of the intermediate flat part 20c.
  • a projection 20d that protrudes toward the can bottom 2c is formed at the center of the cylindrical recess 29 of the negative electrode current collecting member 20.
  • the negative electrode current collecting member 20 includes the first metal layer 21 having the inner peripheral side wall 20a, the outer peripheral side wall 20b, and the intermediate flat portion 20c, and the second metal diffused and fused to the first metal layer 21.
  • the metal layer 22 is formed of an integrated clad material.
  • the second metal layer 22 is formed on one surface of the first metal layer 21 over the entire surface of the first metal layer 21.
  • the first metal layer 21 is formed of, for example, copper or a copper alloy copper-based metal
  • the second metal layer is formed of, for example, nickel. Nickel has a resistance value larger than that of copper, but the bonding force by resistance welding with iron which is a material of the battery can 2 is larger than that of copper.
  • the second metal layer 22 is disposed on the inner surface side of the can bottom 2c of the battery can 2, and resistance welding is performed on the can bottom 2c of the battery can 2.
  • the second metal layer 22 is formed on the outer surface side of the bottom 29 a of the cylindrical recess 29 of the first metal layer 21, and the lower end portion of the shaft core 15 is placed in the cylindrical recess 29 of the negative electrode current collector 20. In the inserted state, the second metal layer 22 faces the inner surface of the can bottom 2 c of the battery can 2.
  • the inner peripheral side wall 20a is formed with a plurality of protruding portions 25 protruding toward the inner surface side in the radial direction of the cylindrical recess 29.
  • a circular space is formed by the tip of the protruding portion 25, and the outer peripheral surface of the shaft core 15 is fitted into the circular space by press-fitting. Accordingly, a gap 26 is formed between the adjacent projecting portions 25 of the inner peripheral side wall 20 a and the shaft core 15.
  • the shaft core 15 fitted in the cylindrical recess 29 is shown by a two-dot chain line.
  • the fitting portion becomes a bag shape and the fluidity of the non-aqueous electrolyte 5 is interrupted. Is done.
  • the fluidity of the non-aqueous electrolyte 5 can be ensured by providing a plurality of protrusions 25 on the inner peripheral side wall 20a and forming the gaps 26 between the protrusions 25. it can.
  • the inner peripheral side wall 20a is formed with an opening 27 penetrating from the inside to the outside of the cylindrical recess 29 of the negative electrode current collecting member 20 corresponding to each gap portion 26.
  • eight circular openings 28 are formed in the intermediate flat portion 20 c of the negative electrode current collecting member 20.
  • the openings 27 and 28 are for ensuring the fluidity of the non-aqueous electrolyte 5 and for degassing the gas generated inside the battery when overcharged.
  • the gas generated in the non-aqueous electrolyte 5 and the battery can flow on the inner side of the shaft core 15 and on the electrode group 10 side without flowing on the negative electrode tab 17 side. Is considered.
  • the opening 27 formed in the inner peripheral side wall 20a of the negative electrode current collecting member 20 is exemplified as a structure formed corresponding to each gap portion 26, the present invention is not limited to this, and the gap portions 26 are not limited thereto.
  • a plurality of openings 27 may be formed, or portions where the openings 27 are not formed at a predetermined interval may be provided.
  • the total thickness of the negative electrode current collecting member 20 is about 1.0 mm.
  • the thickness of the nickel material that is the second metal layer 22 is recommended to be about 0.2 to 0.7 mm.
  • FIG. 6 is a characteristic diagram showing the relationship between the thickness of the nickel material and the bonding force of the battery can 2.
  • the joining force required for joining the bottom 2 c of the battery can 2 and the negative electrode current collecting member 20 is set to 1.
  • the thickness of the nickel material was 0.1 mm, the required joining force could not be obtained, and the average was about 25% insufficient.
  • the thickness of the nickel material was 0.3 mm, a joining force exceeding the required joining force was obtained, and the average value was about 150%. From the above experimental results, if the thickness of the nickel material is 0.2 mm, it becomes 110% or more of the required bonding force, and a sufficient bonding force can be obtained.
  • FIG. 7 is a characteristic diagram showing the resistance value with respect to the thickness of the nickel material.
  • the resistance value characteristic up to a thickness of 1 mm is shown with the resistance value being 1 when the thickness of the nickel material is 0.2 mm.
  • FIG. 8 is a first-order differentiation of FIG. 7, and is a characteristic diagram showing the rate of change in resistance value with respect to the thickness of the nickel material.
  • the nickel material has a changing point in the vicinity of 0.7 mm. That is, when the thickness of the nickel material exceeds about 0.7 mm, the resistance value increases rapidly. This means that the internal resistance of the battery suddenly rises and the battery output is greatly reduced. From the above, it is recommended that the thickness of the nickel material be about 0.2 to 0.7 mm.
  • the electrode group 10 is produced.
  • the positive electrode mixture processing part 11a is formed on both surfaces of the positive electrode metal foil, and the positive electrode 11 in which a number of positive electrode tabs 16 are formed along one side edge in the longitudinal direction of the positive electrode metal foil is produced.
  • the negative electrode mixture processing part 12a is formed in both surfaces of negative electrode metal foil, and the negative electrode 12 in which many negative electrode tabs 17 were formed along the other side edge of the longitudinal direction of negative electrode metal foil is produced.
  • the separator 13, the positive electrode 11, the separator 13, and the negative electrode 12 are wound around the shaft core 15 to produce the electrode group 10.
  • the positive electrode tab 16 of the positive electrode 11 and the negative electrode tab 17 of the negative electrode 12 are laminated so as to be located on opposite sides.
  • the separator 13 on the outermost periphery of the electrode group 10 is bonded with an adhesive tape 19.
  • the negative electrode current collecting member 20 is produced.
  • the negative electrode current collecting member 20 made of the clad material in which the first metal layer 21 and the second metal layer 22 diffused and fused to the first metal layer 21 are integrated is manufactured.
  • the clad material is obtained by hot-rolling the first metal thin plate formed on the first metal layer 21 and the second metal thin plate formed on the second metal layer 22 to obtain the first and second metals.
  • the thin plate is fabricated by metal diffusion bonding at the joining region.
  • the clad material is pressed to form the negative electrode current collecting member 20 shown in FIGS. 4A and 4B having the inner peripheral side wall 20a, the outer peripheral side wall 20b, the intermediate flat portion 20c, and the protrusion 20d. .
  • the lower end portion of the shaft core 15 is press-fitted into the cylindrical recess 29 of the negative electrode current collecting member 20, and the lower end surface of the shaft core 15 is brought into contact with the bottom surface of the cylindrical recess 29.
  • the position of the negative electrode current collecting member 20 in the vertical direction, in other words, the axial direction is determined.
  • the negative electrode tab 17 is almost uniformly distributed and adhered to the outer peripheral surface of the outer peripheral side wall 20b of the negative electrode current collecting member 20, and the negative electrode tab 17 is joined to the negative electrode current collecting member 20 by laser welding by ultrasonic welding or the like.
  • the ribbon 42 is wound on the negative electrode tab 17, and the laser is irradiated from the ribbon 42.
  • the lower portion of the positive electrode current collecting member 31 is press-fitted inside the upper end portion of the shaft core 15.
  • the positive electrode tab 16 of the positive electrode 11 is closely_contact
  • the ribbon 41 is wound around the positive electrode tab 16 and the laser is irradiated from the ribbon 41.
  • one end of the positive electrode conductive lead 32 is joined to one surface of the positive electrode current collecting member 31 by ultrasonic welding or the like.
  • the positive electrode conductive lead 32 is removed from the position corresponding to the hollow portion of the shaft core 15 so as not to obstruct the injection of the non-aqueous electrolyte 5. In this way, the power generation unit is configured.
  • a cylindrical battery can 2 that can accommodate the power generation unit is formed by drawing or the like. Then, the power generation unit manufactured as described above is accommodated in the battery can 2.
  • the can bottom 2c of the battery can 2 corresponding to the periphery of the protrusion 20d of the negative electrode current collecting member 20 accommodated in the battery can 2 is supported by a welding jig 91.
  • the electrode rod 92 is inserted into the hollow portion of the shaft core 15.
  • a cross-sectional view of this state is shown in FIG.
  • the lower end surface of the electrode bar 92 is pressed against the upper surface of the bottom 29 a of the cylindrical recess 29 of the negative electrode current collector member 20, that is, the upper surface of the first metal layer 21.
  • the second metal layer 22 of the negative electrode current collecting member 20 comes into contact with the inner surface of the can bottom 2 c of the battery can 2.
  • the electrode rod 92 and the welding jig 91 are energized, and the negative electrode current collecting member 20 is joined to the can bottom 2c of the battery can 2 by resistance welding or the like.
  • the protrusion 20d of the negative electrode current collecting member 20 is melted and flattened. Accordingly, the entire bottom portion 29 a of the cylindrical recess 29 of the negative electrode current collecting member 20, that is, the bottom portion of the second metal layer 22 is joined to the can bottom 2 c of the battery can 2.
  • the second metal layer 22 is formed over the entire surface of the first metal layer 21 and has a large contact area. For this reason, the contact resistance between the first metal layer 21 and the second metal layer 22 can be reduced.
  • the negative electrode current collecting member 20 is formed with a cylindrical concave portion 29 corresponding to the hollow portion of the shaft core 15, and the cylindrical concave portion 29 includes the first metal layer 21, the second metal layer 22, and the like. Are laminated and formed by metal diffusion bonding. Therefore, the resistance value can be greatly reduced as compared with the conventional structure in which the connection can made of the nickel material alone is joined to the bottom of the battery can 2.
  • a part on the upper end side of the battery can 2 protrudes inward of the diaphragm by grooving, and a substantially U-shaped groove 2a is formed on the outer surface.
  • injection of electrolyte a predetermined amount of the non-aqueous electrolyte 5 is injected into the battery can 2.
  • the non-aqueous electrolyte 5 is injected from the upper part of the hollow portion of the shaft core 15. As described above, the non-aqueous electrolyte 5 injected from the upper part of the hollow part of the shaft core 15 flows from the upper part toward the lower part of the shaft core 15, and the opening 15 a of the shaft core 15.
  • the negative electrode current collecting member 20 flows out from the inner side of the shaft core 15 through the path of the gap 26 and the opening 27.
  • the positive electrode conductive lead 32 is folded back as shown by a dotted line in FIG.
  • the battery cover 3 is caulked and integrated with the periphery of the conductive connection plate 33.
  • a gasket 34 is accommodated in the upper part of the groove 2 a of the battery can 2.
  • a conductive connection plate 33 to which the battery cover 3 is fixed is disposed above the gasket 34.
  • the conductive connection plate 33 is inclined, and the other end of the positive electrode conductive lead 32 whose one end is welded to the positive electrode current collecting member 31 is joined to the conductive connection plate 33 by laser welding or the like.
  • FIG. 10 (Embodiment 2) 9 is a cross-sectional view showing Embodiment 2 of the cylindrical secondary battery of the present invention
  • FIG. 10 (A) is a cross-sectional view of the negative electrode current collector shown in FIG. 9, and FIG. ) Is a bottom view thereof.
  • the negative electrode current collecting member 20A does not have a ring-shaped outer peripheral side wall 20b (see FIG. 4A). That is, the negative electrode current collecting member 20A has a ring-shaped inner peripheral side wall 20a that rises substantially perpendicularly from the bottom 29a of the cylindrical recess 29, and a flat disk-shaped part 20c1 that is bent substantially perpendicularly from the inner peripheral side wall 20a. It is formed into a shape.
  • the configuration in which the negative electrode current collecting member 20A is formed of a clad material in which a first metal layer 21 and a second metal layer 22 diffused and fused to the first metal layer are integrated is an embodiment. Same as 1.
  • the negative electrode current collecting member 20A in Embodiment 2 has a structure in which the second metal layer 22 is formed on the entire lower surface of the flat disk-shaped portion 20c1. For this reason, the negative electrode tab 17 of the negative electrode 12 is joined to the second metal layer 22 at the peripheral edge of the disc-like portion 20c1 of the negative electrode current collecting member 20A.
  • the copper-based metal that is the material of the negative electrode tab 17 and the nickel that is the material of the second metal layer 22 of the negative electrode current collector 20A are difficult to join by ultrasonic welding. For this reason, in Embodiment 2, joining by the negative electrode tab 17 and the 2nd metal layer 22 of 20 A of negative electrode current collection members is recommended by laser welding.
  • the area can be reduced by eliminating the outer peripheral side wall 20b, and the weight can be reduced and the cost can be reduced.
  • Other configurations in the second embodiment are the same as those in the first embodiment, and the corresponding members are denoted by the same reference numerals and description thereof is omitted.
  • FIG. 11 is a cross-sectional view showing Embodiment 3 of the cylindrical secondary battery of the present invention
  • FIG. 12 (A) is a cross-sectional view of the negative electrode current collecting member shown in FIG. ) Is a bottom view thereof.
  • the third embodiment is different from the first embodiment in that the second metal layer 22 is formed only in a partial region of the first metal layer 21 in the negative electrode current collecting member 20B. That is, as illustrated in FIGS. 12A and 12B, in the negative electrode current collector 20 ⁇ / b> B according to the third embodiment, the second metal layer 22 has a width smaller than the diameter of the bottom 29 a of the cylindrical recess 29. Thus, it is formed on one surface side of the first metal layer 21 in a straight line passing through the center of the negative electrode current collecting member 20B.
  • this negative electrode current collecting member 20B In order to produce this negative electrode current collecting member 20B, the second metal thin plate formed on the second metal layer 22 is fitted in advance to the first metal thin plate formed on the first metal layer 21. A groove is formed. Then, the first metal thin plate and the second metal thin plate are hot-rolled in a state where the second metal thin plate is fitted in the groove of the first metal thin plate, and the first and second metal thin plates are joined. A clad material is produced by metal diffusion bonding in the region. Thereafter, similarly to the first embodiment, the negative electrode current collecting member 20B is formed by pressing the clad material.
  • the cost can be reduced.
  • Other configurations in the third embodiment are the same as those in the first embodiment, and the corresponding members are denoted by the same reference numerals and description thereof is omitted.
  • FIG. 14 (Embodiment 4) 13 is a cross-sectional view showing Embodiment 4 of the cylindrical secondary battery of the present invention
  • FIG. 14 (A) is a cross-sectional view of the negative electrode current collector shown in FIG. 13, and FIG. ) Is a bottom view thereof.
  • the negative electrode current collecting member 20C does not have a ring-shaped outer peripheral side wall 20b (see FIG. 12A). That is, the negative electrode current collecting member 20C includes a ring-shaped inner peripheral side wall 20a that rises substantially vertically from the bottom 29a of the cylindrical recess 29, and a flat disk-shaped portion 20c2 that is bent substantially vertically from the inner peripheral side wall 20a. It is formed in the shape to have.
  • the negative electrode current collecting member 20C in Embodiment 4 has a structure in which the second metal layer 22 is formed on a part of the lower surface of the flat disk-shaped portion 20c2. That is, the flat disk-shaped part 20c2 is formed of only the first metal layer 21 except for a part thereof. For this reason, the negative electrode tab 17 of the negative electrode 12 is disposed close to the region where the first metal layer 21 is exposed, avoiding the portion where the second metal layer 22 is formed, and thus the negative electrode tab 17 and the negative electrode current collecting member 20C can be joined by ultrasonic welding.
  • the outer peripheral side wall 20 b is not provided as compared with the first embodiment, and the second metal layer 22 is formed only on a part of the first metal layer 21. Therefore, the area of the second metal layer 22 can be made smaller than those in the second and third embodiments.
  • Other configurations in the fourth embodiment are the same as those in the first embodiment, and the corresponding members are denoted by the same reference numerals and description thereof is omitted.
  • the negative electrode current collector members 20 and 20A to 20C are connected to the first metal layer 21 to which one of the positive and negative electrode tabs 16 and 17 is connected,
  • the clad material was formed by diffusion fusion with the metal layer 21 and the second metal layer 22 joined to the can bottom 2 c of the battery can 2. For this reason, the contact area of the 1st metal layer 21 and the 2nd metal layer 22 becomes a whole surface contact, and the contact resistance of the 1st, 2nd metal layers 21 and 22 can be reduced. Since the contact resistance of the first and second metals is reduced, the thickness of the expensive second metal can be reduced, and the cost can be reduced.
  • the area of the expensive second metal layer 22 can be made smaller by eliminating the outer peripheral side wall 20b and making it flat.
  • the area of the expensive second metal layer 22 can be made smaller.
  • a plurality of protrusions 25 that come into contact with the outer periphery of the shaft core 15 are provided in the cylindrical recesses 29 of the negative electrode current collecting members 20 and 20A to 20C to which the shaft core 15 is fitted. Since 26 is formed, the fluidity of the non-aqueous electrolyte 5 can be ensured.
  • the opening 27 is provided at a position corresponding to each gap portion 26 of the inner peripheral side wall 20a of the negative electrode current collecting member 20, 20A to 20C, the fluidity of the non-aqueous electrolyte 5 is ensured, and overcharge or the like is performed. Degassing of the generated gas can be improved.
  • the plate thickness is set to about 0.2 mm to 0.7 mm, so that the joining force with the battery can 2 is satisfied and the resistance value is A small characteristic part is efficiently utilized, and the cylindrical secondary battery 1 having good characteristics can be formed.
  • the first metal layer 21 is made of copper or a copper alloy
  • the second metal layer 22 is made of nickel.
  • the first metal layer 21 and the second metal layer 22 are not limited to this.
  • the second metal layer 22 is made of stainless steel.
  • the second metal layer 22 is made of aluminum or an aluminum alloy. can do.
  • the metal material constituting the second metal layer 22 a material having a larger bonding force with the battery can 2 than the first metal layer 21 may be used.
  • the present invention can also be applied to a cylindrical secondary battery using a water-soluble electrolyte such as a nickel metal hydride battery, a nickel cadmium battery, or a lead storage battery.
  • a water-soluble electrolyte such as a nickel metal hydride battery, a nickel cadmium battery, or a lead storage battery.
  • the case where the negative electrode current collecting member 20 is joined to the battery can 2 is the negative electrode.
  • the present invention can also be applied to the case where the battery can side that joins the positive electrode current collecting member 31 to the battery can 2 is the positive electrode because the connection structure between the battery can and the current collecting member is the same.
  • the cylindrical secondary battery of the present invention can be applied with various modifications within the scope of the invention.
  • the negative electrode current collecting members 20, 20A to 20C are connected to the positive and negative electrodes.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

Selon l'invention, un élément collecteur de courant est formé d'un matériau de gaine dans lequel sont solidarisés : un premier métal qui connecte une électrode positive et une électrode négative; et un second métal qui est fusionné sous forme de dispersion au premier métal, et qui est lié à un fond appartenant à un boîtier de batterie.
PCT/JP2011/068691 2011-08-18 2011-08-18 Accumulateur cylindrique WO2013024542A1 (fr)

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PCT/JP2011/068691 WO2013024542A1 (fr) 2011-08-18 2011-08-18 Accumulateur cylindrique
PCT/JP2012/070248 WO2013024774A1 (fr) 2011-08-18 2012-08-08 Accumulateur cylindrique
JP2013528985A JP5747082B2 (ja) 2011-08-18 2012-08-08 円筒形二次電池

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WO2024161961A1 (fr) * 2023-01-31 2024-08-08 パナソニックエナジー株式会社 Procédé de fabrication de batterie cylindrique et batterie cylindrique

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US20230327299A1 (en) 2020-09-21 2023-10-12 Panasonic Intellectual Property Management Co., Ltd. Electricity storage device, and method for manufacturing same
CN116569392A (zh) * 2021-09-30 2023-08-08 宁德时代新能源科技股份有限公司 电池单体及其制造方法和制造系统、电池以及用电装置
EP4391197A1 (fr) * 2022-01-27 2024-06-26 Contemporary Amperex Technology Co., Limited Élément de batterie et son procédé de fabrication et son dispositif de fabrication, batterie et appareil électrique
WO2023145680A1 (fr) * 2022-01-28 2023-08-03 パナソニックエナジー株式会社 Batterie et collecteur de courant
CN114628854B (zh) * 2022-03-28 2024-01-30 远景动力技术(江苏)有限公司 圆柱电池及其制造方法

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JP2006107808A (ja) * 2004-10-01 2006-04-20 Matsushita Electric Ind Co Ltd 電池用接続部材
JP2007042526A (ja) * 2005-08-05 2007-02-15 Hitachi Vehicle Energy Ltd リチウム二次電池
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