Instantaneous breaker

Abstract

The present invention discloses an instantaneous breaker. The instantaneous breaker comprises: a lower shell, wherein an arc extinguishing narrow slit is formed in the lower shell in the first direction; a metal fuse which is arranged in the lower shell and penetrates through the arc extinguishing narrow slit in the second direction, wherein the metal fuse is bent into a set shape, opening parts are formed at the two ends of the metal fuse, and the opening parts correspond to the arc extinguishing narrow slit; a conductive part which is arranged on the lower shell, wherein the middle part of the conductive part is provided with an easy-to-break metal sheet, and the easy-to-break metal sheet corresponds to the arc extinguishing narrow slit; the upper shell which covers the conductive part and is connected with the lower shell, wherein the upper shell is sequentially provided with a gas generation device and a piston firing pin from top to bottom, the piston firing pin corresponds to theeasy-to-break metal sheet, and the gas generation device can push the piston firing pin to cut off the easy-to-break metal sheet, insert the easy-to-break metal sheet into the arc extinguishing narrow slit and cut off the metal fuse; and a bottom cover which is arranged at one end, far away from the upper shell, of the lower shell to form a pressure relief cavity, wherein the pressure relief cavity is communicated with the arc extinguishing narrow slit. According to the instantaneous breaker, arc extinguishing is carried out through cooperation of the narrow slits and the metal fuse wires, and the overall arc extinguishing effect is improved.

Description

technical field [0001] The invention relates to the fields of electric power control and electric vehicles, in particular to an instantaneous breaker which utilizes narrow slits and metal fuses for arc extinguishing. Background technique [0002] When an electric vehicle has an internal cable short circuit or a car crash, it is necessary to quickly cut off the line to avoid battery pack fire and electric shock; when a branch of the data center power supply is short-circuited, it is necessary to cut off the branch within ms-level time to avoid the entire network. collapse; where power electronic devices are used to achieve power conversion, the use of instantaneous breakers can minimize damage to power electronic devices. [0003] The working principle of the momentary breaker is divided into two parts: 1. Use the gas generating device to break the main conductor, and an arc will be generated after the main conductor is disconnected; 2. Try to extinguish the arc on the main c...

AI Technical Summary

Problems solved by technology

However, the disadvantages of this method are: (1) The arc extinguishing melt is always connected in parallel with the main conductor, and it will share part of the current during normal operation, which may cause premature aging and failure of the arc extinguishing melt; (2) In the line current When it is cut off when it is zero or very small, the arc extinguishing melt cannot be fused to keep the electrical connection, and there is a safety hazard of electric shock

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