BATTERY PACK

PROBLEM TO BE SOLVED: To provide a battery pack with superior safety and shock resistance, while preventing an internal short-circuit and maintaining proper voltage characteristics even when shocked. SOLUTION: The battery pack comprises a power generation element 1, lead wires for positive and negative electrodes electrically connected to the power generation element 1, a sheath material 4 of a metal lamination resin film; wherein metal lamination resin films of at least three sides around the power generation element 1 are sealed by thermal fusion, and then a battery where the lead wires for positive and negative electrodes are drawn to the outside through a portion thermally fused to the metal lamination resin film of the sheath material 4, a protective circuit element of the battery connected to the lead wires, and external connecting terminals connected to the protective circuit element are integrally formed by a molded resin. In the battery pack, buffering spaces 11 not filled by the molded resin in a part around the battery are formed. COPYRIGHT: (C)2006,JPO&NCIPI