| 摘要 |
PROBLEM TO BE SOLVED: To provide a battery pack which cuts off a current flow at abnormal expansion caused by the abnormal rise of battery internal pressure and can prevent the further abnormal expansion and fracture of a battery, and can be simplified in structure. SOLUTION: The battery pack 100 comprises a plurality of secondary unit cells 110 having terminal members 113, and the terminal members 113 of the adjoining secondary unit cells 110 are connected by a conductive member 120, and each of the secondary unit cells 110 is arranged so that the distance between the terminal members may become longer by the expansion of the secondary unit cells 110. Then, at a part of an electrical connection path 130 constructed of the terminal member 113 and the conductive member 120, a fragile part (jointing part 131) which is not fractured by the expansion of the secondary unit cells 110 at the use of SOC 0%-100% and fractured by the expansion of the secondary unit cells 110 at the start of thermorunaway and cuts off a current flow between the adjoining secondary unit cells 110 is provided. COPYRIGHT: (C)2006,JPO&NCIPI |
