NOVELTY - The secondary battery has an electrode assembly of anode/separation membrane/cathode provided in a battery case. Case has laminated sheet (100) containing inner resin layer (130), barrier metal layer (120) and outer resin layer (110). The inner resin layer is mutually coupled by heat sealing in sealing portion. The metal layer is mutually coupled by welding to form structure which covers coupling portion of inner resin layer. The outer resin layer is coupled by heat sealing or other resin with structure which carries out clothing of coupling portion of metal layer.    USE - Secondary battery is used as power supply for electric vehicles and hybrid electric vehicles (claimed).    ADVANTAGE - The secondary battery is prevented from permeation of moisture content, leakage of electrolyte solution, and corrosion, and has high safety, durability, output characteristics and capacitance. The laminated sheet has improved water resistance and durability.    DETAILED DESCRIPTION - The secondary battery has an electrode assembly of anode/separation membrane/cathode provided in a battery case. Case has laminated sheet (100) containing inner resin layer (130), barrier metal layer (120) and outer resin layer (110). The inner resin layer is mutually coupled by heat sealing in sealing portion. The metal layer is mutually coupled by welding to form structure which covers coupling portion of inner resin layer. The outer resin layer is coupled by heat sealing or other resin with structure which carries out clothing of coupling portion of metal layer. The outer resin layer contains polymeric resin having mechanical strength and weather resistance. The inner resin layer contains polymeric resin having heat fusibility. The polymeric resin of outer resin layer contains extended nylon. The polymeric acid of inner resin layer contains unextended nylon.    DESCRIPTION OF DRAWING(S) - The drawing shows the cross sectional view of sealing portion of laminated sheet. (Drawing includes non-English language text)    Laminated sheet (100)    Outer resin layer (110)    Barrier metal layer (120)    Inner resin layer (130)