| 摘要 |
PROBLEM TO BE SOLVED: To easily control the operating pressure of a safety valve with a simple structure by integrating a safety mechanism with a current interrupting mechanism and providing fixing means whose caulking is detached to release gas therein when the pressure in a battery exceeds a predetermined value. SOLUTION: During charging, current passes an outer positive electrode 1, one lead 4, a conductive path 56 of an element 5, other lead 4, a rivet 3, a terminal 12, a wire 21 and a positive electrode, in sequence. When the pressure in a secondary battery increases, it is transmitted to a safety device 100 of the secondary battery as the pressure in the battery. A diaphragm 7 is then deformed and the inner surface thereof moves upwards the movable plate 6c of an actuator 6, whereby the projection 6d of the actuator 6 abuts on the base plate 5a of the element 5. When the pressure in the battery reaches a predetermined value, the element 5 is pressed into the recess of a case 2 and is broken, thereby breaking the conductive path 56. If the pressure in the battery increases more, a claw 9e of the diaphragm 7 engaging with a negative electrode 10 is disengaged and then a gap is produced between the diaphragm and the perimeter of the opening 10, thereby discharging the gas in the battery. |
