CURRENT CUTOFF DEVICE, SAFETY CIRCUIT, AND SECONDARY BATTERY PACK

To provide a current cutoff device capable of easily handling high current capacity.SOLUTION: A current cutoff device 1 includes: a plate-shaped terminal piece 2 with a contact point 21; a movable piece 4 that includes an elastic portion 44 formed in a plate shape and elastically deformed and a movable contact point 41 at one end of the elastic portion 44 and presses the movable contact 41 to contact it to the contact point; and a thermally actuated element 5 that deforms due to a temperature change to bias the movable piece 4 and shifts the state of the movable piece 4 from a conduction state in which the movable contact point 41 is in contact with the contact point 21 to a cutoff state in which the movable contact point 41 is separated from the contact point 21. When the state of the movable piece 4 shifts from the conduction state to the cutoff state, the movable contact point 41 moves over the contact point 21.SELECTED DRAWING: Figure 1 【課題】高電流容量化に容易に対応できる電流遮断装置を提供する。【解決手段】電流遮断装置１は、接点２１を有する板状の端子片２と、板状に形成され弾性変形する弾性部４４及び弾性部４４の一端部に可動接点４１を有し、可動接点４１を接点に押圧して接触させる可動片４と、温度変化に伴って変形することにより、可動片４を付勢し、可動片４の状態を可動接点４１が接点２１に接触する導通状態から可動接点４１が接点２１から離隔する遮断状態に移行させる熱応動素子５とを備える。可動片４の状態が導通状態から遮断状態に移行する際に、可動接点４１が、接点２１を乗り越えて移動する。【選択図】図１