ALUMINUM ALLOY SHEET FOR BATTERY LID FOR FORMING INTEGRATED EXPLOSION PREVENTION VALVE, AND METHOD FOR PRODUCING SAME

Title:

ALUMINUM ALLOY SHEET FOR BATTERY LID FOR FORMING INTEGRATED EXPLOSION PREVENTION VALVE, AND METHOD FOR PRODUCING SAME

Document Type and Number:

WIPO Patent Application WO/2020/059268

Kind Code:

A1

Abstract:

Provided are: an aluminum alloy sheet for a battery lid that has suitable strength, excellent deformation resistance and moldability, and little variation in operating pressure and that makes it possible to form an integrated explosion prevention valve having excellent cyclic fatigue resistance properties; and a method for producing the aluminum alloy sheet for a battery lid. The aluminum alloy sheet for a battery lid for forming an integrated explosion prevention valve is characterized by having a component composition that includes 0.85-1.50 mass% of Fe, 0.30-0.70 mass% of Mn, 0.002-0.15 mass% of Ti, less than 0.05 mass% of B, and a remainder of Al and impurities, in which the Fe/Mn ratio is controlled so as to be 1.8-3.5, and in which Si, Cu, Mg, and V present as impurities are controlled such that Si is less 0.40 mass%, Cu is less than 0.03 mass%, Mg is less than 0.05 mass%, and V is less than 0.03 mass%. The aluminum alloy sheet for a battery lid for forming an integrated explosion prevention valve is also characterized in that the tensile strength is 95 MPa or more, the 0.2% proof stress is 40 MPa or more, the elongation value is 40% or more, a recrystallized structure is present, and the elongation value after performing cold rolling at a rolling reduction ratio of 80% is 6.5% or more. In addition, the average crystal grain size of the recrystallized grains of the recrystallized structure is preferably 15-25 µm.

Inventors:

TAMAKI YUUICHI (JP)
KANAMORI KEIJI (JP)
SHIMOSAKA DAISUKE (JP)
ANAMI TOSHIYA (JP)

Application Number:

PCT/JP2019/027792

Publication Date:

March 26, 2020

Filing Date:

July 12, 2019

Export Citation:

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Assignee:

NIPPON LIGHT METAL CO (JP)

International Classes:

C22C21/00; C22F1/04; H01M50/147; C22F1/00

Domestic Patent References:

WO2013008314A1

2013-01-17

Foreign References:

JP2008261008A	2008-10-30
JP2007107048A	2007-04-26
JP2013104072A	2013-05-30
CN107604212A	2018-01-19
CN107502787A	2017-12-22
JP2019102431A	2019-06-24
JP2002134069A	2002-05-10
JP2004197172A	2004-07-15
JP2012177186A	2012-09-13
JPH09199088A	1997-07-31
JPS504007B1	1975-02-13
JP5872256B2	2016-03-01

Other References: