BREAKER FOR ACTIVELY CUTTING OFF CIRCUIT

摘要

A breaker for actively cutting off a circuit, in particular a breaker used in a lithium battery power supply, the breaker comprising a housing (400), a temperature sensing mechanism (100), a heat generation mechanism (200) and a bridge contact mechanism (300); the temperature sensing mechanism (100) comprises a temperature sensing body (102);the heat generation mechanism (200) comprises a heat generation component; and the bridge contact mechanism (300) comprises a bridge movable reed (305), at least one bridge static reed (307, 313), an insulation bracket (303) and a first resilient piece (314). The temperature sensing body (102), as a support component of one end of the insulation bracket (303), is controlled by the heat generation component; the bridge movable reed (305) is installed on the insulation bracket (303), one surface thereof directed towards the other end of the insulation bracket (303) forms a contact with the bridge static reeds (307, 313). The bridge movable reed (305), the bridge static reeds (307, 313) and the lithium battery or lithium battery assembly form a lithium battery primary loop in series; the first resilient piece (314) is pressed upward between the other end of the insulation bracket (303) and the inner wall of the housing (400). The breaker coordinated with the battery management system cuts the lithium battery primary loop when over-voltage, over-charge or over-discharge occur with the lithium battery, and eliminates potential hazards such as fire or explosion of the lithium battery under abnormal conditions.