NOVELTY - A battery pack (40) consists of a battery element comprising an anode, a cathode, a separator, a polymeric support, and a non-aqueous electrolyte composition. A soft cladding material having a structure formed by sequential laminate of a thermobonding layer, a metal layer, and an exterior layer packs the battery element. A hard cladding material (41) having a structure formed by sequential laminate of a thermobonding layer, a metal layer, and an exterior layer packs the non-aqueous electrolyte secondary battery.    USE - Battery pack is used for non-aqueous electrolyte secondary batteries, such as lithium ion secondary cells, used as power supply in portable electronic devices, such as mobile telephones, camcorders, video tape recorders, and laptop computers.    ADVANTAGE - The battery pack has excellent reliability, safety, and volumetric efficiency. The load concentration to soft cladding material is suppressed. Generation of gas-evolution is prevented.    DETAILED DESCRIPTION - A battery pack consists of a battery element comprising an anode and a cathode wound or laminated through a separator, a polymeric support arranged between the separator and anode and/or cathode, and a non-aqueous electrolyte composition. A soft cladding material having a structure formed by sequential laminate of a thermobonding layer, a metal layer, and an exterior layer packs the battery element. The electrode terminal of anode and cathode is blocked by the soft cladding material along the circumference of the battery element. A hard cladding material having a structure formed by sequential laminate of a thermobonding layer, a metal layer, and an exterior layer packs the non-aqueous electrolyte secondary battery. A protective circuit board which controls the voltage and electric current of the battery is accommodated in the hard cladding material. The battery element is adhered to the soft cladding material. The soft and hard cladding materials are joined, and the adhesive strength is more than atmospheric pressure and the peeling strength is below the strength at which the soft cladding material ruptures.    DESCRIPTION OF DRAWING(S) - The drawing shows a perspective view of the battery pack. (Drawing includes non-English language text)    Battery pack (40)    Hard cladding material (41)    Top cover (42)    Rear cover (43)    Product label (46)