A kind of overcurrent protection device and its manufacturing method

Abstract

The invention belongs to the technical field of electronic devices, and particularly relates to an overcurrent protection device and a manufacturing method thereof. The overcurrent protection device comprises a fuse body and an insulator with a cavity, and is characterized in that the insulator comprises a first cover plate and a second cover plate which arranged in a stacked manner, the first cover plate is provided with a first concave cavity, the second cover plate is provided with a second concave cavity matched with the first concave cavity, and the first concave cavity and the second concave cavity form a cavity in a covering manner; the length of the first cover plate is less than the length of the second cover plate, the first cover plate is tightly laminated at the middle part of the second cover plate, two end parts of the first cover plate are provided with first end electrodes respectively, and two end parts of the second cover plate are respectively provided with second end electrodes which are electrically connected with the first end electrodes; and the fuse body is clamped between the first cover plate and the second cover plate, the middle part of the fuse body is suspended in the cavity, and two end parts of the fuse body extend out of two end faces of the first cover plate respectively and are electrically connected with the second end electrodes. The overcurrent protection device is high in safety breaking capacity and easy to manufacture, and the fuse body is high in reliability of connection with the end electrodes.

Description

technical field [0001] The invention belongs to the technical field of electronic devices, and in particular relates to an overcurrent protection device and a manufacturing method thereof. Background technique [0002] The overcurrent protection device is a device composed of a fuse and an insulator that supports or protects the fuse. It uses a metal material or paste with a lower melting point to make a metal wire / sheet as a fuse, which is connected in series in the protected circuit. When the circuit or the equipment in the circuit is overloaded or fails, the fuse is instantly fused due to heat, thereby cutting off the circuit and achieving the purpose of protecting the circuit or equipment. With the development of miniaturization of overcurrent protection devices, the breaking safety of fuse links has gradually become an important factor to be considered in high voltage and high current applications. At the moment when the fault current is too large or the short circuit ...

AI Technical Summary

Problems solved by technology

[0006] 1) Due to the inconsistency of the thermal expansion coefficient between the metal melt, the end electrodes, and the insulating substrate when they are subjected to cold and heat shocks, the product will loosen after a period of use due to the weakening of the adhesion between the fuse and the end electrodes under the cold and heat shock;

[0007] 2) The two insulating substrates are made of ordinary epoxy resin materials, and because the glass transition temperature (Tg) of epoxy resin is low, it is easy to cause deformation of the insulator shell when the fuse is overloaded by current;

[0008] 3) In the process of bonding the upper and lower insulating substrates with adhesive, too much glue will flow out along the fuse and cover the wire end, which will easily lead to abnormal connection between the fuse and the terminal electrode and cannot work normally

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