An exterior material for a power storage device, the exterior material being constituted by a laminate including at least a substrate layer, a barrier layer, an adhesive layer, and a thermally adhesive resin layer, in this order, wherein a corrosion-resistant film is provided at least on the surface on the adhesive layer-side of the barrier layer, and when a cross-sectional observation image is acquired using a scanning electron microscope, for the cross section in the thickness direction of the corrosion-resistant film, the corrosion-resistant film is observed in a belt shape in the cross-sectional observation image.

An exterior material for a power storage device, the exterior material being constituted by a laminate including at least a substrate layer, a barrier layer, an adhesive layer, and a thermally adhesive resin layer, in this order, wherein a corrosion-resistant film is provided at least on the surface on the adhesive layer-side of the barrier layer, and when a cross-sectional observation image is acquired using a scanning electron microscope, for the cross section in the thickness direction of the corrosion-resistant film, the corrosion-resistant film is observed in a belt shape in the cross-sectional observation image.

A method of packaging a battery device with a metal shell, comprising: applying a waterborne two-component polyurethane composition to the metal shell of the battery device, and drying the applied polyurethane composition to form a packaging layer; wherein the polyurethane composition comprises, (A) an aqueous dispersion comprising a hydroxyl-functional polymer, wherein the hydroxyl-functional polymer comprises, by weight based on the weight of the hydroxyl-functional polymer, from 20% to 50% of structural units of a hydroxy-functional alkyl (meth)acrylate; from 0.1% to 10% of structural units of an acid monomer, a salt thereof, or mixtures thereof; and structural units of a monoethylenically unsaturated nonionic monomer; and (B) a polyisocyanate.

A method of packaging a battery device with a metal shell, comprising: applying a waterborne two-component polyurethane composition to the metal shell of the battery device, and drying the applied polyurethane composition to form a packaging layer; wherein the polyurethane composition comprises, (A) an aqueous dispersion comprising a hydroxyl-functional polymer, wherein the hydroxyl-functional polymer comprises, by weight based on the weight of the hydroxyl-functional polymer, from 20% to 50% of structural units of a hydroxy-functional alkyl (meth)acrylate; from 0.1% to 10% of structural units of an acid monomer, a salt thereof, or mixtures thereof; and structural units of a monoethylenically unsaturated nonionic monomer; and (B) a polyisocyanate.

A UV curable dielectric coating is described. The curable coating can include one of more acrylate monomers, a urethane prepolymer, a crosslinker, at least one adhesion promoter, a photoinitiator, and optionally one or more fillers and/or additives. The coating can be used to insulate battery cells and battery packs, such as those used in electric vehicles. The coatings can be easily applied and quickly cured. The cured coatings can have high adhesion strength, even after exposure to wet conditions.

A UV curable dielectric coating is described. The curable coating can include one of more acrylate monomers, a urethane prepolymer, a crosslinker, at least one adhesion promoter, a photoinitiator, and optionally one or more fillers and/or additives. The coating can be used to insulate battery cells and battery packs, such as those used in electric vehicles. The coatings can be easily applied and quickly cured. The cured coatings can have high adhesion strength, even after exposure to wet conditions.

A battery cell includes a housing. A dimension of the housing along a length direction of the battery cell is greater than a dimension of the housing along a thickness direction of the battery cell and a dimension of the housing along a width direction of the battery cell. The housing includes a board extending along the length direction and an accommodation space opened from at least one end of the accommodation space. The battery cell further includes an electrode assembly disposed in the accommodation space and a cover configured to cover the opening. A pressure relief mechanism is disposed at the board and configured to be actuated, in response to an internal pressure or temperature of the housing reaching a threshold, to relieve the internal pressure. In the length direction, an extension dimension of the pressure relief mechanism is greater than or equal to ¼ of an extension dimension of the board.

A battery cell includes a housing. A dimension of the housing along a length direction of the battery cell is greater than a dimension of the housing along a thickness direction of the battery cell and a dimension of the housing along a width direction of the battery cell. The housing includes a board extending along the length direction and an accommodation space opened from at least one end of the accommodation space. The battery cell further includes an electrode assembly disposed in the accommodation space and a cover configured to cover the opening. A pressure relief mechanism is disposed at the board and configured to be actuated, in response to an internal pressure or temperature of the housing reaching a threshold, to relieve the internal pressure. In the length direction, an extension dimension of the pressure relief mechanism is greater than or equal to ¼ of an extension dimension of the board.

To provide a laminate which has a heat sealing property, a barrier property and mechanical strength, of which elution of impurities from the surface to be in contact with a chemical solution is suppressed, and of which peeling and the like hardly occur at the sealed portion of a bag and at the interfaces between the layers of the laminate when exposed to high temperature, a bag using it and a lithium ion battery. A laminate 10 comprising a first layer 12 containing a fluororesin, a second layer 14 containing a barrier material, a third layer 16 containing a fluororesin and a fourth layer 18 containing a polyamide in this order, wherein each of the fluororesin in the first layer 12 and the fluororesin in the third layer 16 is a fluororesin having a melting point of from 160 to 230° C. and having adhesive functional groups.

Thin-film batteries having a novel encapsulation system.