Batterie-Paket

PURPOSE:To cut off a battery current at the time of an abnormality, keep a thermosensitive cutoff element at the cutoff state with a small current, miniaturize safety parts, and reduce the storage space. CONSTITUTION:This pack battery stores a thermosensitive cutoff element 1 cut off when the battery temperature rises and a heating resistor 3 connected in parallel with the thermosensitive cutoff element 1 and heating the thermosensitive cutoff element 1 kept at the cutoff state with Joule's heat. The heating resistor 3 is stored in the case 4 of the thermosensitive cutoff element 1. The Joule's heat of the heating resistor 3 heats the thermosensitive cutoff element 1 stored together to prevent its return. The heating resistor 3 stored in the case 4 together with the thermosensitive cutoff element 1 efficiently heats the thermosensitive cutoff element 1 to keep it at the off state.