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

A battery packaging material comprising a laminate comprising at least a base material layer, an aluminum alloy foil, a resin layer, and a heat-sealable layer in this order, wherein:

• the heat-sealable layer is composed of a resin comprising a polyolefin backbone,
• the resin layer is a cured product of a resin composition comprising an acid-modified polyolefin and a curing agent,
• the base material layer is a laminate of a polyester film and a polyamide film,
• a thickness of the base material layer is more than 35 μm and 50 μm or less,
• a thickness X of the aluminum alloy foil is more than 40 μm and 80 μm 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≤0.056X+2.0,
• where R and X are measured in μm.

A battery packaging material comprising a laminate comprising at least a base material layer, an aluminum alloy foil, a resin layer, and a heat-sealable layer in this order, wherein:

• the heat-sealable layer is composed of a resin comprising a polyolefin backbone,
• the resin layer is a cured product of a resin composition comprising an acid-modified polyolefin and a curing agent,
• the curing agent is an epoxy-based curing agent, a polyfunctional isocyanate-based curing agent, a carbodiimide-based curing agent, or an oxazoline-based curing agent,
• the base material layer is a laminate of a polyester film and a polyamide film,
• a thickness of the base material layer is more than 35 μm and 50 μm or less,
• a thickness X of the aluminum alloy foil is more than 40 μm and 80 μm 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≤0.056X+2.0,
• where R and X are measured in μm.