WO2016030918A1 - リチウムイオン二次電池用ケース及びその製造方法 - Google Patents
リチウムイオン二次電池用ケース及びその製造方法 Download PDFInfo
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- WO2016030918A1 WO2016030918A1 PCT/JP2014/004368 JP2014004368W WO2016030918A1 WO 2016030918 A1 WO2016030918 A1 WO 2016030918A1 JP 2014004368 W JP2014004368 W JP 2014004368W WO 2016030918 A1 WO2016030918 A1 WO 2016030918A1
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- Prior art keywords
- phase
- stainless steel
- ion secondary
- steel foil
- temperature
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 31
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 31
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 10
- 239000011888 foil Substances 0.000 claims abstract description 34
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 29
- 238000009792 diffusion process Methods 0.000 claims abstract description 26
- 239000010935 stainless steel Substances 0.000 claims abstract description 22
- 229910001566 austenite Inorganic materials 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 13
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 9
- 229910000963 austenitic stainless steel Inorganic materials 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 5
- 230000009466 transformation Effects 0.000 claims description 5
- 229910001039 duplex stainless steel Inorganic materials 0.000 claims description 4
- 230000000630 rising effect Effects 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 abstract description 3
- 239000010959 steel Substances 0.000 abstract description 3
- 230000005012 migration Effects 0.000 abstract 1
- 238000013508 migration Methods 0.000 abstract 1
- 238000003466 welding Methods 0.000 description 20
- 239000000463 material Substances 0.000 description 19
- 229910052782 aluminium Inorganic materials 0.000 description 13
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 12
- 239000002648 laminated material Substances 0.000 description 6
- 238000005304 joining Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000008151 electrolyte solution Substances 0.000 description 4
- -1 polypropylene Polymers 0.000 description 4
- 239000004743 Polypropylene Substances 0.000 description 3
- 230000009977 dual effect Effects 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 229920001155 polypropylene Polymers 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229910021642 ultra pure water Inorganic materials 0.000 description 3
- 239000012498 ultrapure water Substances 0.000 description 3
- 239000011800 void material Substances 0.000 description 3
- 239000003792 electrolyte Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229910000734 martensite Inorganic materials 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000004544 sputter deposition Methods 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000000550 scanning electron microscopy energy dispersive X-ray spectroscopy Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
- 238000002604 ultrasonography Methods 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
-
- 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
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/002—Resistance welding; Severing by resistance heating specially adapted for particular articles or work
- B23K11/0026—Welding of thin articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- 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
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/06—Resistance welding; Severing by resistance heating using roller electrodes
- B23K11/061—Resistance welding; Severing by resistance heating using roller electrodes for welding rectilinear seams
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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
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/16—Resistance welding; Severing by resistance heating taking account of the properties of the material to be welded
- B23K11/20—Resistance welding; Severing by resistance heating taking account of the properties of the material to be welded of different metals
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- 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
- B23K20/02—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating by means of a press ; Diffusion bonding
- B23K20/023—Thermo-compression bonding
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- 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
- B23K20/22—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating taking account of the properties of the materials to be welded
- B23K20/227—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating taking account of the properties of the materials to be welded with ferrous layer
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- 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
- B23K20/24—Preliminary treatment
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
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- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
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- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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- H—ELECTRICITY
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- 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
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
- H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular
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- H—ELECTRICITY
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- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/116—Primary casings; Jackets or wrappings characterised by the material
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- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/131—Primary casings; Jackets or wrappings characterised by physical properties, e.g. gas permeability, size or heat resistance
- H01M50/133—Thickness
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- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/138—Primary casings; Jackets or wrappings adapted for specific cells, e.g. electrochemical cells operating at high temperature
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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
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/147—Lids or covers
- H01M50/148—Lids or covers characterised by their shape
- H01M50/15—Lids or covers characterised by their shape for prismatic or rectangular cells
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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
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- H01M50/148—Lids or covers characterised by their shape
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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
- H01M50/10—Primary casings; Jackets or wrappings
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- 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
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/147—Lids or covers
- H01M50/166—Lids or covers characterised by the methods of assembling casings with lids
- H01M50/169—Lids or covers characterised by the methods of assembling casings with lids by welding, brazing or soldering
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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
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/02—Iron or ferrous alloys
- B23K2103/04—Steel or steel alloys
- B23K2103/05—Stainless steel
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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
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/18—Dissimilar materials
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/001—Austenite
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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- 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
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- 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
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- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
Definitions
- the present invention relates to a case for a lithium ion secondary battery using stainless steel foil as a material of the case and a method of manufacturing the same.
- lithium ion secondary batteries Since lithium ion secondary batteries have high energy, they are used as power sources for mobile communication devices and power sources for portable information terminals. Moreover, in recent years, it is beginning to be used as a driving power source for hybrid vehicles and electric vehicles, which are widely used as measures against global warming.
- the material plate thickness in this case is 0.5 to 0.8 mm.
- a lithium ion secondary using an aluminum laminate having a thickness of 0.1 mm or less as a base material and an aluminum laminate material in which a resin film such as polypropylene is laminated on the surface of the base is used as a case material Batteries have come to be used.
- an example of the manufacturing method (process) of a lithium ion secondary battery will be explained.
- an aluminum laminate material is drawn and formed into a flanged cup product, and the positive and negative electrode electrodes sandwiching the separator in the cup And the positive and negative electrode terminals are led out from the flange portion of the cup product.
- a cup-like or flat lid component is prepared, and after the cup product and lid component are superimposed, the resin film of aluminum laminate is pressure-heated and melted at the flange portion It is joined by heat seal. After the bonding is completed, an electrolytic solution is injected into the case to complete the lithium ion secondary battery.
- the battery case using such an aluminum laminate material can be reduced in weight, the strength against external force is low because the base material is aluminum, so it is necessary to separately provide a reinforcing plate for protecting the battery case. There is. Moreover, the electrolyte solution leaks from the junction part obtained by heat sealing, and it also has the subject that battery performance falls.
- Patent Document 1 describes a method of using austenitic stainless steel foil as a material and using seam welding for joining a cup product and a lid part Has been proposed.
- the material is austenitic stainless steel foil, which is stronger than aluminum laminate material, and seam welding is used for joining. Therefore, insufficient strength against external force such as battery case using aluminum laminate material as a material and heat Electrolyte leakage from the seal portion can be eliminated.
- welding spatter occurs inside and outside the cup during seam welding, internal short circuit of the battery may occur.
- the lithium ion secondary battery case disclosed in Patent Document 1 uses austenitic stainless steel foil as a raw material and joins using seam welding, thereby achieving weight reduction, strength against external force, and electrolyte leakage. Although the problem can be solved, there is a problem that the joint can not be completed without welding spatter at the time of seam welding.
- the lithium ion secondary battery case 1 of the present invention uses stainless steel foil as a material of the cup component 2 and the lid component 3 to achieve the purpose, and welds are not performed by joining the junctions by diffusion bonding. Realize the bonding of
- the cup component 2 is made of austenitic stainless steel foil and has the flange 8 formed on the periphery of the opening, and the austenite transformation start temperature Ac 1 point in the temperature raising process at 650 to 950 ° C.
- a two-phase stainless steel foil having a phase temperature range in the range of 880 ° C. or higher, and a lid part 3 covering the opening of the cup part 2;
- the vertical wall 7 of the cup part 2 is provided with a hole 6 for leading out the electrode terminal, and the flange 8 of the cup part 2 and the lid part 3 are brought into direct contact and integrated by diffusion bonding.
- 1 is a case 1 for a lithium ion secondary battery.
- the material of the stainless steel foil cup product 2 to be brought into contact is drawn. because it involves processing, using the austenitic stainless steel foil, also, the lid part 3 material, the austenite transformation start temperature Ac 1 point in the Atsushi Nobori process has to 650 ⁇ 950 ° C., the austenite + ferrite two-phase temperature region A duplex stainless steel foil having a range of 880 ° C. or higher is applied. And, it is characterized in that the diffusion bonding is progressed with grain boundary movement when the ferrite phase of the dual phase stainless steel foil is transformed to the austenite phase at a heating temperature of 880 to 1080 ° C.
- the duplex stainless steel foil used for the lid part 3 has the following chemical composition and has an austenite + ferrite duplex phase range in the range of 880 ° C. or higher. It is preferred to apply a foil.
- the X value is 650 to 950.
- X value 35 (Cr + 1.72 Mo + 2.09 Si + 4.86 Nb + 8.29 V + 1.
- the above-mentioned X value is an index which can accurately estimate the austenite transformation start temperature Ac 1 point in the temperature rising process in a dual phase stainless steel foil having an austenite + ferrite dual phase temperature range in a range of 880 ° C. or higher. is there.
- stainless steels are classified into austenitic stainless steels, ferritic stainless steels, martensitic stainless steels, etc. based on the metallographic structure at normal temperature, but "two-phase stainless steel" as referred to in the present specification is Ac 1 point It is a steel that forms an austenite + ferrite two-phase structure in the above temperature range.
- duplex stainless steels include ferritic stainless steels and martensitic stainless steels.
- the heating temperature at the time of diffusion bonding is set to a temperature range of 880 to 1080 ° C. This is because if the heating temperature is less than 880 ° C., sufficient bonding strength can not be obtained, and conversely, if the heating temperature exceeds 1080 ° C., the bonding strength is sufficient, but This is because there is a possibility that welding spatter may occur due to the current applied to the part to be joined to raise the temperature to a temperature.
- the strength of the material itself is higher than in the case using the conventional aluminum laminate material with aluminum as the base material.
- the strength against external force is also increased, which makes it difficult to deform the battery itself.
- the electrode terminals are derived from the holes provided in the vertical wall portion of the cup part, it is not necessary to laminate a resin film for giving a heat seal or insulation function to the bonding area between the cup part and the lid part. It becomes. Therefore, the bonding between the cup part housing the electrode and the separator and the lid part can be performed only by diffusion bonding in which welding spatter does not occur. Furthermore, when forming the cup parts, small flanges may be generated due to the use of stainless steel foil having a higher strength than aluminum etc., but diffusion bonding may be performed even if the flanges are also smaller. At the same time, since bonding is performed while being pressurized by the upper and lower electrodes, reliable bonding can be performed. That is, according to the present invention, it is possible to provide a case for a lithium ion secondary battery capable of joining without welding sputtering and having strength against an external force, and a method of manufacturing the same.
- FIG. 1 is a schematic view of an apparatus according to an embodiment of the present invention. It is a schematic diagram which shows the case components which investigated the spatter scattering condition. It is a schematic diagram of the investigation method of a sputter
- FIG. 1 is a schematic view of a lithium ion secondary battery case 1 according to an embodiment of the present invention
- FIG. 2 is a cup part 2 constituting the lithium ion secondary battery case 1.
- This cup part 2 is drawn from austenitic stainless steel foil as a raw material to form a cup-like part, and holes 6 for leading out the electrode terminals 4 and 5 are drilled. By diffusion bonding this and the lid part 3, it becomes a case 1 for a lithium ion secondary battery.
- the above-described air holes 6 are provided in the vertical wall portion 7 of the cup part 2.
- the cup part 2 and the lid part 3 use stainless steel foil as a material. Since stainless steel foil used for the cup part 2 is accompanied by drawing processing, austenitic stainless steel foil is used. On the other hand, as stainless steel foil used for the lid part 3, in order to perform diffusion bonding without welding spatter, duplex stainless steel foil is used. The thickness of both stainless steel foils is not particularly limited, but is usually 0.1 mm or less.
- the cup part 2 is a stainless steel foil drawn into a cup shape with a flange 8 and on one surface of the vertical wall 7 on the short side, the positive electrode terminal 4 and the negative electrode terminal 5 are formed. A pair of left and right holes 6 are formed.
- hole 6 can be performed by stamping, for example.
- hole 6 has shown the rectangular thing, the shape of the void
- the cup part 2 although not shown, a pair of electrodes serving as a positive electrode and a negative electrode are accommodated with a separator interposed therebetween, and the electrode terminals 4 and 5 connected to the respective electrodes are led out from the holes 6.
- the size of the hole 6 is formed to be slightly larger than the electrode terminals 4 and 5, and in the gap between the electrode terminals 4 and 5 and the hole 6, the cup component 2 and the electrode terminal 4 are In order to insulate from and 5, the insulating part 9 is attached.
- the material of the insulating component 9 is not particularly limited, but a synthetic resin product such as polypropylene is preferably used.
- the insulating component 9 may be welded and fixed as necessary to improve the degree of sealing of the holes 6 from which the electrode terminals 4 and 5 are led out.
- a lithium ion secondary battery A as shown in FIG. 1 using the lithium ion secondary battery case 1 first, the electrode terminals 4 and 5 are voided as described above. After the sheet 6 is taken out, a thin plate-like lid part 3 having substantially the same size as the outer edge of the flange 8 is superposed on the opening of the cup part 2 and the cup part 2 and the lid part 3 Diffusion bonding to join and integrate.
- a seam welding machine 11 as shown in FIG. 3 is used.
- a rod-like electrode 11a having a square cross-sectional shape is used as an electrode disposed on the cup part 2 side.
- a disk-shaped electrode wheel 11 b is used as an electrode disposed on the lid part 3 side.
- the rod-like electrode 11a on the cup part 2 side is fixed, and the electrode ring 11b on the other lid part 3 side is rotated and joined.
- the insulating component 9 is melted and fixed so as to fill the gaps between the electrode terminals 4 and 5 and the holes 6 which are led out, and after the electrolytic solution is injected from an injection port not shown, the injection port is sealed to The ion secondary battery A is completed.
- the foil (plate thickness 0.1 mm) of SUS304 which is austenitic stainless steel was used as a raw material of the cup part 2.
- a foil of two-phase stainless steel having a thickness of 0.1 mm was used as a raw material of the cup part 3.
- the respective alloy components are shown in Table 1. Note that "-" in the table means "no analysis value”.
- the dimensions of the cup part 2 were 150 mm in width of the cup part, 100 mm in depth, 20 mm in height, and 10 mm in width of the flange 8.
- the cup part 2 was manufactured in four steps of blank punching, drawing, hole punching and flange trimming.
- the electrode sandwiching the separator was housed in the cup part 2 manufactured in such a process, and the electrode terminals 4 and 5 were led out from the holes 6. Thereafter, the cup part 2 and the lid part 3 were superposed and diffusion bonding was performed using the seam welding machine 11 to form the diffusion bonding part 10.
- the electrode on the cup component 2 side is a rod-like electrode 11a having a square cross section and having a length of 8 mm on one side, and the electrode on the lid component 3 has a diameter of 100 mm and a width of 5 mm Electrode wheel 11b.
- the diffusion bonding conditions were such that the applied pressure was 150 N, the welding speed was 1.0 m / min, and the welding current was continuous conduction of (A) 0.5 kA, (B) 1.0 kA, (C) 2.0 kA. . Under this condition, the junction temperature is estimated to be (A) 850 ° C., (B) 1050 ° C., (C) 1250 ° C.
- a film made of polypropylene as the insulating component 9 is filled in the gap between the electrode terminals 4 and 5 and the holes 6, and the film is heated and melted at 120 ° C. to insulate the electrode terminals 4 and 5 from the cup component 2.
- the case parts were manufactured by fixing in the state.
- an electrolyte solution based on lithium hexafluorophosphate was injected into the inside of the case component from an injection hole (not shown) to produce a lithium ion secondary battery A.
- the manufactured lithium ion secondary battery A was repeatedly charged and discharged for one month to evaluate the condition of the battery such as the presence or absence of liquid leakage. As a result of the evaluation, no liquid leakage from the diffusion bonding portion 10 or a short circuit caused by welding spatter occurred.
- the lithium ion secondary battery according to the present invention is suitable for use as a polymer type lithium ion secondary battery.
- a ... lithium ion secondary battery 1 ... case for lithium ion secondary battery 2 ... cup part 3 ... lid part 4 ... (positive electrode) electrode terminal 5 ... (negative electrode) electrode terminal 6 ... hole 7 ... vertical wall portion 8 ... Flange 9 ... Insulating part 10 ... Diffusion joint 11 ... Seam welding machine 11 a ... Rod electrode 11 b ... Electrode wheel 12 ... Container 13 ... Ultra pure water
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Abstract
Description
このようなアルミラミネート材を用いた電池ケースは、軽量化を図れるものの、基材がアルミニウムであるために外力に対する強度が低いため、その電池ケースを保護する補強板を別に設ける必要があるという課題がある。
また、ヒートシールにより得られた接合部から電解液が漏れ、電池性能が低下するという課題も有している。
前記カップ部品2の縦壁部7に電極端子導出用の空孔6が設けられると共に、前記カップ部品2のフランジ8と蓋部品3とを直接接触させて拡散接合により一体化したことを特徴とするリチウムイオン二次電池用ケース1である。
質量%で、C:0.0001~0.15%、Si:0.001~1.0%、Mn:0.001~1.0%、Ni:0.05~2.5%、Cr:13.0~18.5%、Cu:0~0.2%、Mo:0~0.5%、Al:0~0.05%、Ti:0~0.2%、Nb:0~0.2%、V:0~0.2%、B:0~0.01%、N:0.005~0.1%、残部Feおよび不可避的不純物からなり、下記(1)式で示されるX値が650~950である。
X値=35(Cr+1.72Mo+2.09Si+4.86Nb+8.29V+1.77Ti+21.4Al+40.0B-7.14C-8.0N-3.28Ni-1.89Mn-0.51Cu)+310 …(1)
上記X値は、オーステナイト+フェライト2相温度域を880℃以上の範囲に持つ2相系ステンレス鋼箔において、昇温過程でのオーステナイト変態開始温度Ac1点を精度よく推定することができる指標である。
さらに、カップ部品を成形した際に、アルミニウムなどより強度の高いステンレス鋼箔を素材とするためフランジ部に小さなうねりが生じる可能性があるが、フランジ部に小さなうねりが生じたとしても、拡散接合時に上下電極により加圧しながら接合するため、信頼性の高い接合を行うことが出来る。
つまり、本発明によれば、溶接スパッタなしでの接合ができ、外力に対する強度を有することができるリチウムイオン二次電池用ケースとその製造方法とを提供することができる。
(実施形態)
図1は、本発明の実施形態に係るリチウムイオン二次電池用ケース1の模式図であり、図2は前記リチウムイオン二次電池用ケース1を構成するカップ部品2である。このカップ部品2は、オーステナイト系ステンレス鋼箔を素材として絞り加工してカップ状の部品とし、更に電極端子4,5を導出するための空孔6を穿設したものである。これと、蓋部品3とを拡散接合することにより、リチウムイオン二次電池用ケース1となる。なお、詳しくは後述するが、図示実施形態では、上記の空孔6がカップ部品2の縦壁部7に設けられている。
一方、蓋部品3に用いるステンレス鋼箔は、溶接スパッタなしの拡散接合を行うために2相系ステンレス鋼箔を用いる。両ステンレス鋼箔の板厚は特に限定されないが、通常0.1mm以下である。
このカップ部品2内には、図示しないが、正極及び負極となる一対の電極がセパレータを挟んで収納され、空孔6から前記の各電極に接続された電極端子4及び5が導出される。このため、空孔6の大きさは電極端子4及び5よりも多少大きい寸法に形成されており、電極端子4及び5と空孔6との間の隙間には、カップ部品2と電極端子4及び5との絶縁を図るために絶縁部品9が装着されている。この絶縁部品9の材質は、特に限定されないが、ポリプロピレンなどの合成樹脂製品が好適に用いられる。なお、この絶縁部品9は、必要に応じて溶着・固着させて、電極端子4及び5を導出させた空孔6の密閉度を向上させるようにしても良い。
その後、導出した電極端子4および5と空孔6との隙間を埋めるように絶縁部品9を溶融・固着させ、図示しない注入口から電解液を注入した後、当該注入口を封止してリチウムイオン二次電池Aが完成となる。
このような工程で製造したカップ部品2の中に、セパレータを挟んだ電極を収納し、空孔6から電極端子4,5を導出した。その後、カップ部品2と蓋部品3を重ね合わせてシーム溶接機11を用いた拡散接合を行い、拡散接合部10を形成した。
拡散接合のための電極として、カップ部品2側の電極は、断面形状が正四角形で、1辺の長さが8mmの棒状電極11aとし、蓋部品3側の電極は直径100mm、幅5mmの円盤状の電極輪11bとした。そして、拡散接合条件は、加圧力を150N、溶接速度を1.0m/minとし、溶接電流を(A)0.5kA、(B)1.0kA、(C)2.0kAの連続通電とした。この条件では、接合部の温度は、(A)850℃、(B)1050℃、(C)1250℃と推定される。
その結果、接合条件(A)、(B)は金属元素が確認されず、接合条件(C)は金属元素が確認された。
また、拡散接合部の断面を顕微鏡観察し、蓋部品3側の金属組織を調査した結果、接合条件(A)、(B)は接合部の界面が溶接ナゲットなしの拡散接合となっており、(C)は接合部界面が溶融し溶接ナゲットが形成されていた。
1…リチウムイオン二次電池用ケース
2…カップ部品
3…蓋部品
4…(正極の)電極端子
5…(負極の)電極端子
6…空孔
7…縦壁部
8…フランジ
9…絶縁部品
10…拡散接合部
11…シーム溶接機
11a…棒状電極
11b…電極輪
12…容器
13…超純水
Claims (2)
- オーステナイト系ステンレス鋼箔からなり、開口部の周縁にフランジ(8)が形成されたカップ部品(2)と、
昇温過程でのオーステナイト変態開始温度Ac1点を650~950℃に持ち、オーステナイト+フェライト2相温度域を880℃以上の範囲に持つ2相系ステンレス鋼箔からなり、前記カップ部品(2)の開口部を覆う蓋部品(3)とを備え、
前記カップ部品(2)の縦壁部(7)に電極端子導出用の空孔(6)が設けられると共に、
前記カップ部品(2)におけるフランジ(8)の全周と蓋部品(3)とを直接接触させて拡散接合により一体化した、
ことを特徴とするリチウムイオン二次電池用ケース(1)。 - ステンレス鋼箔から成形されたカップ部品(2)と蓋部品(3)を直接接触させ、拡散接合により一体化するリチウムイオン二次電池用ケース(1)の製造方法であって、
前記カップ部品(2)はオーステナイト系ステンレス鋼箔を用い、
前記蓋部品(3)は昇温過程でのオーステナイト変態開始温度Ac1点を650~950℃に持ち、オーステナイト+フェライト2相温度域を880℃以上の範囲に持つ2相系ステンレス鋼箔を用い、
前記拡散接合の際には、加熱温度880~1080℃の温度範囲で、前記2相系ステンレス鋼箔のフェライト相がオーステナイト相へ変態するときの粒界移動を伴いながら拡散接合を進行させる、
ことを特徴とするリチウムイオン二次電池用ケース(1)の製造方法。
Priority Applications (11)
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ES14900810.4T ES2689352T3 (es) | 2014-08-25 | 2014-08-25 | Cubierta para batería secundaria de ion litio y método de fabricación de la misma |
EP14900810.4A EP3174125B1 (en) | 2014-08-25 | 2014-08-25 | Lithium-ion secondary-battery case and manufacturing method therefor |
CN201480081474.1A CN107078230B (zh) | 2014-08-25 | 2014-08-25 | 锂离子二次电池用外壳的制造方法 |
KR1020177005094A KR101918010B1 (ko) | 2014-08-25 | 2014-08-25 | 리튬 이온 2차 전지용 케이스의 제조 방법 |
PCT/JP2014/004368 WO2016030918A1 (ja) | 2014-08-25 | 2014-08-25 | リチウムイオン二次電池用ケース及びその製造方法 |
AU2014404621A AU2014404621B2 (en) | 2014-08-25 | 2014-08-25 | Lithium-ion secondary-battery case and manufacturing method therefor |
MYPI2017700625A MY170689A (en) | 2014-08-25 | 2014-08-25 | Lithium-ion secondary-battery case and manufacturing method therefor |
HUE14900810A HUE040588T2 (hu) | 2014-08-25 | 2014-08-25 | Lítiumionos akkumulátor doboz és az elõállítására szolgáló eljárás |
US15/506,157 US10790480B2 (en) | 2014-08-25 | 2014-08-25 | Lithium-ion secondary-battery case and manufacturing method therefor |
SG11201701358PA SG11201701358PA (en) | 2014-08-25 | 2014-08-25 | Lithium-ion secondary-battery case and manufacturing method therefor |
PL14900810T PL3174125T3 (pl) | 2014-08-25 | 2014-08-25 | Obudowa litowo-jonowej baterii akumulatorowej i sposób jej wytwarzania |
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EP (1) | EP3174125B1 (ja) |
KR (1) | KR101918010B1 (ja) |
CN (1) | CN107078230B (ja) |
AU (1) | AU2014404621B2 (ja) |
ES (1) | ES2689352T3 (ja) |
HU (1) | HUE040588T2 (ja) |
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ES2689352T3 (es) * | 2014-08-25 | 2018-11-13 | Nisshin Steel Co., Ltd. | Cubierta para batería secundaria de ion litio y método de fabricación de la misma |
CN108767157A (zh) * | 2018-05-31 | 2018-11-06 | 浙江智造热成型科技有限公司 | 一种高强度电池箱 |
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EP2709128B1 (en) | 2011-05-12 | 2019-11-20 | Seiko Instruments Inc. | Electrochemical cell |
ES2689352T3 (es) * | 2014-08-25 | 2018-11-13 | Nisshin Steel Co., Ltd. | Cubierta para batería secundaria de ion litio y método de fabricación de la misma |
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JP2013041788A (ja) * | 2011-08-19 | 2013-02-28 | Nisshin Steel Co Ltd | リチウムイオン二次電池 |
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KR20170057242A (ko) | 2017-05-24 |
CN107078230B (zh) | 2020-01-21 |
EP3174125A4 (en) | 2017-08-23 |
US10790480B2 (en) | 2020-09-29 |
HUE040588T2 (hu) | 2019-03-28 |
ES2689352T3 (es) | 2018-11-13 |
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EP3174125A1 (en) | 2017-05-31 |
PL3174125T3 (pl) | 2019-03-29 |
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US20170271627A1 (en) | 2017-09-21 |
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