Aluminium alloy foil with reduced cracking during molding, battery packaging material, and battery

Patent metadata

Field	Value
Publication number	US-2024051267-A1
Application number	US-202318378836-A
Country	US
Kind code	A1
Filing date	Oct 11, 2023
Priority date	Dec 28, 2016
Publication date	Feb 15, 2024
Grant date	—

Abstract

Aluminum alloy foil that, when used for battery packaging material, unlikely to develop pinholes or cracks even during molding of battery packaging material, and can exhibit excellent moldability. Aluminum alloy foil, which is for use in battery packaging material, wherein, with respect to cross section obtained by cutting aluminum alloy foil in vertical direction to rolling direction of aluminum alloy foil, which is a vertical direction to surface of aluminum alloy foil, proportion of total area of a {111} plane in total area of crystal planes of face-centered cubic structure, obtained by performing crystal analysis using EBSD method, is 10% or more; and with respect to cross section, a number average grain diameter R (μm) of crystals in face-centered cubic structure, obtained by performing crystal analysis using EBSD method, satisfies following equation: number average grain diameter R≤0.056X+2.0, where X=thickness (μm) of aluminum alloy foil.

First claim

1 . An aluminum alloy foil for a battery packaging material, the aluminum alloy foil being for use in the battery packaging material, wherein
with respect to a cross section obtained by cutting the aluminum alloy foil in a vertical direction to a rolling direction of the aluminum alloy foil, which is a vertical direction to a surface of the aluminum alloy foil, a proportion of a total area of a {111} plane in a total area of crystal planes of a face-centered cubic structure, obtained by performing crystal analysis using an EBSD method, is 10% or more; and with respect to the cross section, a number average grain diameter R (μm) of crystals in the face-centered cubic structure, obtained by performing crystal analysis using the EBSD method, satisfies the following equation:
number average grain diameter R≤ 0.056 X+ 2.0,

where X=thickness (μm) of the aluminum alloy foil.

2 . The aluminum alloy foil for a battery packaging material according to claim 1 , wherein the proportion (%) of the total area of the {111} plane in the total area of crystal planes of the face-centered cubic structure satisfies the following equation:
proportion (%) of the total area of the {111} plane in the total area of crystal planes of the face-centered cubic structure≥−1.1 X+ 66,
where X=thickness (μm) of the aluminum alloy foil.

3 . The aluminum alloy foil for a battery packaging material according to claim 1 , wherein a standard deviation St of the grain diameter satisfies the following equation:
standard deviation St of the grain diameter≤0.09 X+ 0.5,

where X=thickness (μm) of the aluminum alloy foil.

4 . The aluminum alloy foil for a battery packaging material according to claim 1 , comprising iron.

5 . The aluminum alloy foil for a battery packaging material according to claim 1 , comprising, on a surface thereof, an acid resistance film containing at least one element selected from the group consisting of phosphorus, chromium, and cerium.

6 . The aluminum alloy foil for a battery packaging material according to claim 1 , comprising, on a surface thereof, an acid resistance film, wherein when analysis of the acid resistance film is performed using time-of-flight secondary ion mass spectrometry, a peak derived from at least one of Ce + and Cr + is detected.

7 . The aluminum alloy foil for a battery packaging material according to claim 1 , comprising, on a surface thereof, an acid resistance film containing at least one selected from the group consisting of a phosphorus compound salt, a chromium compound, a fluorine compound, and a triazine-thiol compound.

8 . The aluminum alloy foil for a battery packaging material according to claim 1 , comprising, on a surface thereof, an acid resistance film containing a cerium compound.

9 . A battery packaging material comprising a laminate comprising at least a base material layer, the aluminum alloy foil for a battery packaging material according to claim 1 , and a heat-sealable resin layer in this order.

10 . A battery comprising a battery element comprising at least a positive electrode, a negative electrode, and an electrolyte, the battery element being housed in a packaging material formed of the battery packaging material according to claim 9 .

Assignees

• Dainippon Printing Co Ltd

Inventors

• Takahagi Atsuko
• Ishitobi Tatsuro
• Hatsuta Chiaki
• Komukai Makoto
• Sugano Mayo

Classifications

• B32B15/08 Primary

  of synthetic resin · CPC title

• B32B15/20

  comprising aluminium or copper {(B32B15/016 and B32B15/017 take precedence)} · CPC title

• H01M4/662

  Alloys (collectors of lead alloys H01M4/685) · CPC title

• H01M50/145

  for protecting against corrosion · CPC title

• H01M50/119

  Metals · CPC title