Aluminum alloy foil and method for manufacturing same

Patent metadata

Field	Value
Publication number	US-9732402-B2
Application number	US-201314417039-A
Country	US
Kind code	B2
Filing date	Jul 24, 2013
Priority date	Aug 1, 2012
Publication date	Aug 15, 2017
Grant date	Aug 15, 2017

Abstract

An aluminum alloy foil having superior formability is provided. An aluminum alloy foil, including 0.8 to 2.0 mass % of Fe, 0.05 to 0.2 mass % of Si, and 0.0025 to 0.5 mass % of Cu, with the rest consisting of Al and unavoidable impurities, wherein the aluminum alloy foil has an average crystal grain size of 20 μm or less, and a number of intermetallic compounds existing in the aluminum alloy foil, the intermetallic compounds having a circle equivalent diameter of 1.0 to 5.0 μm, is 1.0×10 4 grains/mm 2 or more, is provided.

First claim

The invention claimed is:

1. An aluminum alloy foil, comprising:
0.8 to 2.0 mass % of Fe, 0.05 to 0.2 mass % of Si, and 0.0025 to 0.5 mass % of Cu, with the rest consisting of Al and unavoidable impurities, wherein
the aluminum alloy foil has an average crystal grain size of 20 μm or less, and
a number of intermetallic compounds existing in the aluminum alloy foil, the intermetallic compounds having a circle equivalent diameter of 1.0 to 5.0 μm, is 1.0×10 4 grains/mm 2 or more.

2. The aluminum alloy foil of claim 1 , wherein an average value of tensile strength of the aluminum alloy foil in 0 degrees, 45 degrees, and 90 degrees with respect to the rolling direction is 100 N/mm 2 or higher.

3. A formed packaging material comprising the aluminum alloy foil of claim 1 .

4. The formed packaging material of claim 3 , further comprising:
a synthetic resin film laminated on one side of the aluminum alloy foil, and
a heat sealing layer laminated on an other side of the aluminum alloy foil.

5. A secondary battery comprising the formed packaging material of claim 4 .

6. A package container for medicine comprising the formed packaging material of claim 4 .

7. A method for manufacturing the aluminum alloy foil of claim 1 , comprising the steps of:
performing a homogeneous retention of an aluminum alloy ingot comprising 0.8 to 2.0 mass % of Fe, 0.05 to 0.2 mass % of Si, and 0.0025 to 0.5 mass % of Cu, with the rest consisting of Al and unavoidable impurities at 430° C. or higher and 540° C. or lower for 1 hour or longer and 6 hours or shorter;
performing a hot rolling immediately after the homogeneous retention, and a cold rolling after the hot rolling;
performing an intermediate annealing by retaining at 350° C. or higher in between the cold rolling;
performing the cold rolling at a cold rolling rate of 95% or higher from after the intermediate annealing until achieving final foil thickness; and
performing final annealing after the cold rolling to obtain the aluminum alloy foil.

Assignees

• Uacj Corp

Inventors

• Seki Masakazu
• Suzuki Satoshi

Classifications

• H01M50/131

  characterised by physical properties, e.g. gas permeability, size or heat resistance · CPC title

• H01M50/119

  Metals · CPC title

• H01M50/121

  Organic material · CPC title

• H01M2/0287

  Electricity · mapped topic

• B65D23/02

  Linings or internal coatings · CPC title