Sealing and packaging method for high-voltage large-current fuse

Abstract

The invention belongs to a fuse sealing method. In order to solve the technical problems that, in the prior art, two ends of a fuse are sealed by sealing rings or pouring glue, the sealing structure is difficult to design and poor in sealing effect, a conventional welding method in welding sealing is adopted, the instantaneous temperature is high during welding, and the damage to the ceramic tubeand the damage to the filler in the ceramic tube are easily caused, the invention provides a sealing and packaging method for a high-voltage large-current fuse. The process steps of metalizing the endsurface of the ceramic tube, plating nickel on the inner cap of the ceramic tube, performing vacuum brazing on the ceramic tube and the inner cap of the ceramic tube, plating gold on a welded body ofthe inner cap of the ceramic tube, plating nickel and gold on the outer cap of the ceramic tube and performing low-temperature brazing on the inner and outer cap of the ceramic tube are adopted, thehigh-voltage large-current fuse formed through sealed packaging is uniform in weld joint welding, and the method has the advantages of being high in mechanical strength, good in environmental tolerance and high in stability and reliability.

Description

technical field [0001] The invention belongs to a fuse sealing method, in particular to a high-voltage and high-current fuse sealing and packaging method. Background technique [0002] High-voltage and high-current fuse is a device that quickly generates heat when the current exceeds the rated value to quickly fuse the melt, thereby providing rapid short-circuit protection for high-voltage circuits or systems. It has been widely used in power systems, charging power supplies, and batteries. , new energy vehicles, electric locomotives, ships, submarines, aerospace and other fields. [0003] A high-voltage high-current fuse is generally composed of a ceramic tube 1, a filled sand body, a melt and a metal end cap. Among them, the ceramic tube is a hollow structure, which is generally formed by isostatic pressing, and has the characteristics of high strength and good sealing; the ceramic tube 1 is filled with electrical structures such as sand bodies and melts. In order to obt...

AI Technical Summary

Problems solved by technology

[0007] The main purpose of the present invention is to solve the problem that both ends of the fuse in the prior art are sealed with sealing rings or potting glue, the design of the sealing structure is difficult, and the sealing effect is not good. , a technical problem that easily leads to damage to the ceramic tube and the filling inside the ceramic tube, and provides a method for sealing and packaging high-voltage and high-current fuses

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