NOVELTY - A lithium-ion battery exterior material is obtained by laminating base material layer containing resin film, primary contact bonding layer, metal foil layer, corrosion-prevention process layer, secondary contact bonding layer and sealant layer, in order. The resin film is 10% stretched with respect to length of the film before tension test, has stress value of 110 MPa or less along flow direction or vertical direction, in which at least one of the stress value in the flow direction or vertical direction of the resin film is 70 MPa or more.    USE - Exterior material e.g. aluminum lamination-type material is used for manufacturing lithium-ion battery.    ADVANTAGE - The lithium-ion battery exterior material has excellent moldability.    DETAILED DESCRIPTION - A lithium-ion battery exterior material is obtained by laminating base material layer containing resin film, primary contact bonding layer laminated on one surface of the base material layer, metal foil layer, corrosion-prevention process layer, secondary contact bonding layer and sealant layer, in order. The resin film has water-absorption rate of 0.1-3%, measured based on JIS K 7209:2000. The resin film is 10% stretched with respect to length of the film before tension test, has stress value of 110 MPa or less along flow direction or vertical direction, in which at least one of the stress value in the flow direction or vertical direction of the resin film is 70 MPa or more. The tensile test of the resin film is carried out at tensioning rate of 300 mm/minute on 6 mm width of film which is stored at 23 degrees C for 24 hours in 40% of relative humidity environment, in which the distance between reference point on the resin film is 35 mm.    DESCRIPTION OF DRAWING(S) - The drawing shows a sectional view of the lithium-ion battery exterior material.    Lithium-ion battery exterior material (1)    Base material layer (11)    Primary contact bonding layer (12)    Metal foil layer (13)    Corrosion-prevention process layer (14)    Secondary contact bonding layer (15)    Sealant layer (16)