| 摘要 |
PROBLEM TO BE SOLVED: To provide a nonaqueous electrolyte secondary battery with high reliability without leaking liquid if exposed to high temperatures in its overcharged state and capable of maintaining its discharging performance. SOLUTION: This battery is equipped with a return-type switch made of a shape memory alloy for cutting off a charging circuit from an external power supply by thermal actuation and simultaneously switching/connecting to a discharging circuit. The switch comprises a temperature sensitive element 1, an insulator 2, a first conductive plate 3a, a second conductive plate 3b, and a resistor R. The sensitive element 1 is electrically connected to the conductive plate 3a in the beginning, When the temperature of the battery rises and exceeds 60 deg.C for example. the memory alloy of the sensitive element 1 is deformed and separated from the conductive plate 3a, thus cutting off the conduction. |
