US12570073USUSPTO Grant XML

Battery packaging material having aluminium alloy foil with reduced cracking during molding, and battery including the same

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 ( m) 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 ( m) of aluminum alloy foil.

Patent

Brief

Patent brief

Problem

How can battery fires and thermal runaway in EV packs be prevented?

Novelty

Aluminum alloy foil, which is for use in battery packaging material, wherein, with respect to cross section obtained by...

Uses

Patent review

Assignee

DAI NIPPON PRINTING CO., LTD.

Published

Mar 10, 2026

Inventors

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

Domain

Mobility / storage

Plain-English summary

Problem

How can battery fires and thermal runaway in EV packs be prevented?

Solution

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.

Key novelty

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 ( m) 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 ( m) of aluminum alloy foil.

Applications

Patent review

Relevant search intents

8e9a3f8b5ca7

Claims preview

1 . A battery packaging material comprising a laminate comprising at least a base material layer, an aluminum alloy foil, and a heat-sealable layer in this order, wherein: the heat-sealable layer is composed of a resin comprising a polyolefin backbone, a thickness of the base material layer is more than 35 m and 50 m or less, a thickness X of the aluminum alloy foil is more than 40 m and 80 m or less, with respect to a cross section obtained by cutting the aluminum alloy foil in a vertical direction that is perpendicular to both a rolling direction of the aluminum alloy foil and 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 using an EBSD method, is 10% or more, and with respect to the cross section, a number average grain diameter R of crystals in the face-centered cubic structure, obtained using the EBSD method, satisfies the following equation: number average grain diameter R 0.056 X+ 2.0, where R and X are measured in m. 2 . The 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 1.1X+66, where X is measured in m. 3 . The battery packaging material according claim 1 , wherein the aluminum alloy foil comprises iron.

Battery packaging material having aluminium alloy foil with reduced cracking during molding, and battery including the same

Plain-English summary

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