Patent ID: 7709114
Filing Date: 2010-05-04
Classification: H01M,Y02E,Y02P

Abstract:
1. 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, 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, wherein the flexible covering member is sealed along around the battery element while leaving electrode terminals of the positive and negative electrodes extended to outside the battery element; 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, the second heat-bonding layer being a composite layer including a sealant layer and a bonding layer, the second heat-bonding layer has heat bonding properties with the outer covering layer, and the sealant layer exhibits a cushioning effect so that the first and second laminated films having finely uneven surfaces can be well bonded together; 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 by melting the second heat-bonding layer without melting the first outer covering layer, the first outer covering layer has a melting temperature higher than that of the second heat-bonding layer.