Patent ID: 8092937

Claim:
A battery pack comprising: a non-aqueous electrolyte secondary battery including: a battery element including a positive electrode, a negative electrode, and a separator which are spirally wound or stacked, the separator being disposed between the positive electrode and the negative electrode, the battery element including a non-aqueous electrolyte composition, a tape; and a flexible covering member, formed of a first laminated film, which covers the battery element, the first laminated film being composed of a first heat-bonding layer, a first metal layer, and a first outer covering layer which are laminated successively, said first outer covering layer including a first portion that covers the battery element and a second portion folded over said first portion; wherein the flexible covering member is sealed around the battery element while leaving electrode terminals of the positive and negative electrodes extended outside the battery element, said tape being disposed between said first portion and said second portion of said first outer covering layer; a rigid covering member which covers the non-aqueous electrolyte secondary battery together with the flexible covering member, the rigid covering member being formed of a second laminated film composed of a second heat-bonding layer, a second metal layer, and a second outer covering layer which are laminated successively; and a protection circuit board, housed in the rigid covering member, for controlling a voltage and a current of the non-aqueous electrolyte secondary battery, wherein the battery element and the flexible covering member adhere to each other, and the flexible covering member and the rigid covering member are bonded with an adhesive strength equal to or higher than atmospheric pressure and with a peel strength equal to or lower than a breaking strength of the flexible covering member, wherein the flexible covering member and the rigid covering member are bonded such that the first outer covering layer is not melted and the second heat-bonding layer is melted.