WO1997029217A1 - Tole d'acier pour un boitier de batterie en deux parties d'une excellente aptitude au formage, de resistance a la fragilisation par ecrouissage secondaire et de resistance a la corrosion - Google Patents

Tole d'acier pour un boitier de batterie en deux parties d'une excellente aptitude au formage, de resistance a la fragilisation par ecrouissage secondaire et de resistance a la corrosion Download PDF

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Publication number
WO1997029217A1
WO1997029217A1 PCT/JP1997/000327 JP9700327W WO9729217A1 WO 1997029217 A1 WO1997029217 A1 WO 1997029217A1 JP 9700327 W JP9700327 W JP 9700327W WO 9729217 A1 WO9729217 A1 WO 9729217A1
Authority
WO
WIPO (PCT)
Prior art keywords
steel sheet
corrosion resistance
moldability
resistance
secondary work
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP1997/000327
Other languages
English (en)
French (fr)
Inventor
Yoshihiro Hosoya
Katsumi Tanikawa
Katsumi Kojima
Takashi Awaya
Hirohide Furuya
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JFE Engineering Corp
Original Assignee
NKK Corp
Nippon Kokan Ltd
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=26388373&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO1997029217(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority claimed from JP8048147A external-priority patent/JPH09209083A/ja
Priority claimed from JP04814896A external-priority patent/JP3959753B2/ja
Application filed by NKK Corp, Nippon Kokan Ltd filed Critical NKK Corp
Priority to EP97902627A priority Critical patent/EP0822266B2/en
Priority to AU16706/97A priority patent/AU721071B2/en
Priority to DE69708224T priority patent/DE69708224T3/de
Priority to KR1019970707086A priority patent/KR100293169B1/ko
Priority to US08/913,642 priority patent/US6126759A/en
Publication of WO1997029217A1 publication Critical patent/WO1997029217A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
    • 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
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • 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
    • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
    • H01M50/117—Inorganic material
    • H01M50/119—Metals
    • 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
    • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
    • H01M50/124—Primary casings; Jackets or wrappings characterised by the material having a layered structure
    • 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
    • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
    • H01M50/124—Primary casings; Jackets or wrappings characterised by the material having a layered structure
    • H01M50/1243—Primary casings; Jackets or wrappings characterised by the material having a layered structure characterised by the internal coating on the casing
    • 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
    • H01M50/131—Primary casings; Jackets or wrappings characterised by physical properties, e.g. gas permeability, size or heat resistance
    • H01M50/133—Thickness
    • 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
    • H01M50/14—Primary casings; Jackets or wrappings for protecting against damage caused by external factors
    • H01M50/145—Primary casings; Jackets or wrappings for protecting against damage caused by external factors for protecting against corrosion
    • 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
    • H01M50/545—Terminals formed by the casing of the cells
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12771—Transition metal-base component
    • Y10T428/12861—Group VIII or IB metal-base component
    • Y10T428/12937—Co- or Ni-base component next to Fe-base component
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12771—Transition metal-base component
    • Y10T428/12861—Group VIII or IB metal-base component
    • Y10T428/12951—Fe-base component
    • Y10T428/12958—Next to Fe-base component

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
  • Electroplating Methods And Accessories (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
PCT/JP1997/000327 1996-02-08 1997-02-07 Tole d'acier pour un boitier de batterie en deux parties d'une excellente aptitude au formage, de resistance a la fragilisation par ecrouissage secondaire et de resistance a la corrosion Ceased WO1997029217A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP97902627A EP0822266B2 (en) 1996-02-08 1997-02-07 Steel sheet for two-piece battery can excellent in moldability, secondary work embrittlement resistance, and corrosion resistance
AU16706/97A AU721071B2 (en) 1996-02-08 1997-02-07 Steel sheet for 2 piece battery can having excellent formability, anti secondary work embrittlement and corrosion resistance
DE69708224T DE69708224T3 (de) 1996-02-08 1997-02-07 Stahlblech mit hervorragender formbarkeit, weiterverarbeitungsversprödungswiderstand und rostbeständigkeit für zweiteiliges batteriegehäuse
KR1019970707086A KR100293169B1 (ko) 1996-02-08 1997-02-07 성형가공성,내이차 가공취성 및내식성이 우수한 ２피스 전지캔용강판
US08/913,642 US6126759A (en) 1996-02-08 1997-02-07 Steel sheet for 2-piece battery can having excellent formability, anti secondary work embrittlement and corrosion resistance

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP8048147A JPH09209083A (ja) 1996-02-08 1996-02-08 耐二次加工脆性と耐食性の優れた２ピース電池缶用鋼板
JP8/48147 1996-02-08
JP04814896A JP3959753B2 (ja) 1996-02-08 1996-02-08 耐食性の優れた２ピース電池缶用鋼板
JP8/48148 1996-02-08

Publications (1)

Publication Number Publication Date
WO1997029217A1 true WO1997029217A1 (fr) 1997-08-14

Family

ID=26388373

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP1997/000327 Ceased WO1997029217A1 (fr) 1996-02-08 1997-02-07 Tole d'acier pour un boitier de batterie en deux parties d'une excellente aptitude au formage, de resistance a la fragilisation par ecrouissage secondaire et de resistance a la corrosion

Country Status (7)

Country Link
US (1) US6126759A (ja)
EP (1) EP0822266B2 (ja)
KR (1) KR100293169B1 (ja)
CN (1) CN1089376C (ja)
AU (1) AU721071B2 (ja)
DE (1) DE69708224T3 (ja)
WO (1) WO1997029217A1 (ja)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7502712B1 (ja) * 2023-04-06 2024-06-19 日本製鉄株式会社 鋼板
WO2024209721A1 (ja) * 2023-04-06 2024-10-10 日本製鉄株式会社 鋼板

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW338071B (en) 1996-05-09 1998-08-11 Toyo Koban Kk A battery container and surface treated steel sheet for battery container
BE1011066A3 (fr) * 1997-03-27 1999-04-06 Cockerill Rech & Dev Acier au niobium et procede de fabrication de produits plats a partir de celui-ci.
JP3604879B2 (ja) * 1997-08-05 2004-12-22 松下電器産業株式会社 電池の製造方法
TW502467B (en) 1998-03-18 2002-09-11 Toshiba Battery Battery, lead member for battery connection, and battery pack using the same
CN1147595C (zh) * 1998-12-30 2004-04-28 希勒及穆勒有限公司 具有良好成形性能的钢带及其生产方法
DE10129900C1 (de) * 2001-06-21 2003-02-13 Hille & Mueller Gmbh Verfahren zur Wärmebehandlung eines Kaltbandes mit einer Oberflächenbeschichtung aus Ni und/oder Co, durch das Verfahren herstellbares Blech und durch das Verfahren herstellbarer Batteriebecher
JP4491208B2 (ja) * 2003-08-29 2010-06-30 パナソニック株式会社 電池缶およびその製造方法ならびに電池
JP4765439B2 (ja) * 2004-07-23 2011-09-07 ソニー株式会社 電池パック
KR100982120B1 (ko) * 2005-08-12 2010-09-14 제이에프이 스틸 가부시키가이샤 2피스 캔 및 그 제조방법, 및 2피스 캔용 강판
CN110541123B (zh) * 2019-09-05 2021-06-15 首钢集团有限公司 一种电池壳用冷轧带钢及其制备方法
CN120394628A (zh) * 2024-02-01 2025-08-01 通用汽车环球科技运作有限责任公司 包括淬硬钢的电池组电池的外壳
CN120921012A (zh) * 2024-05-10 2025-11-11 通用汽车环球科技运作有限责任公司 辊轧成形钢部件

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6123786A (ja) * 1984-07-09 1986-02-01 Nippon Steel Corp 耐食性に優れた容器用鋼板の製造法
JPS6384874U (ja) * 1986-11-25 1988-06-03
JPH03199342A (ja) * 1989-12-28 1991-08-30 Kawasaki Steel Corp 溶接部耐久性に優れる加工用薄鋼板
JPH05287449A (ja) * 1992-04-06 1993-11-02 Kawasaki Steel Corp 耐食性に優れた缶用鋼板およびその製造方法
JPH0641683A (ja) * 1992-04-06 1994-02-15 Kawasaki Steel Corp 缶用鋼板およびその製造方法
JPH073395A (ja) * 1993-06-17 1995-01-06 Toyo Kohan Co Ltd 深絞り性、溶接性に優れた薄鋼板およびその製造方法

Family Cites Families (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5144486B2 (ja) † 1971-09-30 1976-11-29
JPS56169727A (en) * 1980-05-29 1981-12-26 Nippon Kokan Kk <Nkk> Manufacture of hot-rolled steel plate for enameled product having excellent antifishscale property
JPS57104627A (en) † 1980-12-19 1982-06-29 Nippon Kokan Kk <Nkk> Manufacture of cold rolled soft steel plate with superior press formability by continuous annealing
JPS6045689B2 (ja) † 1982-02-19 1985-10-11 川崎製鉄株式会社 プレス成形性にすぐれた冷延鋼板の製造方法
JPS6050149A (ja) * 1983-08-26 1985-03-19 Daido Steel Co Ltd 冷間成形加工性にすぐれた構造用鋼
JPS60262918A (ja) † 1984-06-08 1985-12-26 Kawasaki Steel Corp ストレツチヤ−ストレインの発生しない表面処理原板の製造方法
JP2810257B2 (ja) * 1991-07-12 1998-10-15 片山特殊工業株式会社 電池用缶および該缶形成材料
EP0565066B1 (en) * 1992-04-06 1997-07-02 Kawasaki Steel Corporation A tin mill black plate for canmaking, and method of manufacturing
US5356493A (en) * 1992-07-08 1994-10-18 Nkk Corporation Blister-resistant steel sheet and method for producing thereof
JPH0634684A (ja) * 1992-07-15 1994-02-10 Oki Micro Design Miyazaki:Kk 位相差デジタル変換回路
JPH06346282A (ja) * 1993-06-04 1994-12-20 Katayama Tokushu Kogyo Kk 電池用缶の形成材料及び該材料の製造方法
JP2786578B2 (ja) * 1993-06-04 1998-08-13 片山特殊工業株式会社 電池用缶材料の製造方法及び該電池用缶材料
JPH06346150A (ja) * 1993-06-04 1994-12-20 Katayama Tokushu Kogyo Kk 電池用缶の形成材料及びその製造方法
ES2106376T3 (es) * 1993-06-04 1997-11-01 Katayama Tokushu Kogyo Kk Vaso de baterias; chapa para formar un vaso de baterias y metodo para fabricar dicha chapa.
US5476556A (en) * 1993-08-02 1995-12-19 Kawasaki Steel Corporation Method of manufacturing steel for machine structural use exhibiting excellent free cutting characteristic, cold forging characteristic and post-hardening/tempering fatigue resistance
JP2785237B2 (ja) * 1993-09-28 1998-08-13 キヤノン株式会社 無線通信装置
JP3512873B2 (ja) * 1994-11-24 2004-03-31 新日本製鐵株式会社 高寿命高周波焼入れ軸受鋼
US5855696A (en) † 1995-03-27 1999-01-05 Nippon Steel Corporation Ultra low carbon, cold rolled steel sheet and galvanized steel sheet having improved fatigue properties and processes for producing the same

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6123786A (ja) * 1984-07-09 1986-02-01 Nippon Steel Corp 耐食性に優れた容器用鋼板の製造法
JPS6384874U (ja) * 1986-11-25 1988-06-03
JPH03199342A (ja) * 1989-12-28 1991-08-30 Kawasaki Steel Corp 溶接部耐久性に優れる加工用薄鋼板
JPH05287449A (ja) * 1992-04-06 1993-11-02 Kawasaki Steel Corp 耐食性に優れた缶用鋼板およびその製造方法
JPH0641683A (ja) * 1992-04-06 1994-02-15 Kawasaki Steel Corp 缶用鋼板およびその製造方法
JPH073395A (ja) * 1993-06-17 1995-01-06 Toyo Kohan Co Ltd 深絞り性、溶接性に優れた薄鋼板およびその製造方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP0822266A4 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7502712B1 (ja) * 2023-04-06 2024-06-19 日本製鉄株式会社 鋼板
WO2024209721A1 (ja) * 2023-04-06 2024-10-10 日本製鉄株式会社 鋼板

Also Published As

Publication number Publication date
DE69708224T3 (de) 2007-01-18
DE69708224T2 (de) 2003-03-13
CN1188515A (zh) 1998-07-22
DE69708224D1 (de) 2001-12-20
EP0822266A4 (en) 1999-05-19
KR100293169B1 (ko) 2001-06-15
KR19980703686A (ko) 1998-12-05
CN1089376C (zh) 2002-08-21
EP0822266B1 (en) 2001-11-14
AU721071B2 (en) 2000-06-22
EP0822266B2 (en) 2006-08-02
AU1670697A (en) 1997-08-28
US6126759A (en) 2000-10-03
EP0822266A1 (en) 1998-02-04

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