Controlled fusing current protector

Abstract

The invention provides a controlled fusing current protector. In the controlled fusing current protector, a plurality of temperature fuses are connected in parallel, each of the temperature fuses is of a horizontal ceramic tubular structure, leads at the two ends of each of the temperature fuses are respectively welded or riveted on main electrodes at the two ends to form a main current loop, a resistor alloy wire is further wound around the surface of each of the temperature fuses to form a wire-wound resistor, the two ends of each wire-wound resistor are connected in parallel and outwards extend, the temperature fuses are fused by heating energy of the wire-wound resistor to cut off a circuit, so that a controlled function is fulfilled. Two large-current terminals of the current fusing protector are generally connected to a main circuit in serial to serve as a main fuse; when too large fault current, excessive high temperature or other abnormal phenomena are sensed by an external control circuit, the control circuit controls a contact to be closed, so that a power supply of a wire-wound resistor heating body is connected, and the temperature rise of the heating body facilitates quick fusing of the main fuse.

Description

technical field [0001] The invention relates to a controlled current fuse, in particular to a controlled current fuse for secondary battery safety protection Background technique [0002] In recent years, the technical development of secondary batteries has been increasingly advanced, and power batteries for various purposes have also been developed. Electric bicycles, sightseeing cars, buses, electric vehicles, communications, post and telecommunications, railways, military ships and other fields will drive the vigorous development of the entire power lithium battery industry. Efficient new energy. Generally, the discharge current of these power battery packs is above tens of amperes, and some even reach hundreds of amperes. Due to the widespread use of power batteries, there is a problem of protecting the charging and discharging of power battery packs. For example, there has been a power battery management system composed of electronic circuits, which is a contactor sw...

AI Technical Summary

Problems solved by technology

However, this kind of contactor has a large volume and relatively high cost, and because the contact is used to cut off the current, there will also be hidden dangers caused by the ability of the contact to withstand current and its own contact resistance.

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