OUTER PACKAGE MATERIAL FOR POWER STORAGE DEVICES, METHOD FOR PRODUCING SAME, AND POWER STORAGE DEVICE
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United States of America Patent
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Sep 5, 2024
app pub date -
Jun 29, 2022
filing date -
Jun 29, 2021
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Abstract
An outer package material for power storage devices, the outer package material being composed of a multilayer body which sequentially includes at least a base material layer, a barrier layer and a thermally fusible resin layer in this order, wherein: the barrier layer contains an aluminum alloy foil that has a composition containing 0.2% by mass to 2.0% by mass of Fe and 0.1% by mass to 5.0% by mass of Mg; and with respect to this aluminum alloy foil, the ratio of the length L1 of a high angle grain boundary to the length L2 of a low angle grain boundary per unit area as determined by a back scattering electron diffraction method satisfies the relational expression L1/L2>3.0.
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