Macromolecular thermistance element and manufacturing method thereof

Abstract

The invention relates to a macromolecular thermistance element which comprises a PTC chip and two metal foil electrode layers; the PTC chip comprises a conductive composite material layer with positive temperature coefficient characteristics and two conductive dope layers which are respectively coated on two surfaces of the conductive composite material layer; the two metal foil electrode layers are respectively adhered on the two conductive dope layers. More preferably, the conductive dope layers are blending layers which consists of 10%-30% of acrylate polymer and 70%-90% of conductive metal powder and thicknesses of the conductive dope layers are 2 microns-15 microns; the conductive composite material layer is a blending layer which consists of crystalline polymer and conductive fillings; two extraction electrodes are respectively fixed on outer surfaces of the two metal foil electrode layers. The invention also provides a manufacturing method of the macromolecular thermistance element. The macromolecular thermistance element of the invention has smart design, low resistance, excellent resistance reparability and fine PTC effect resilience, thereby improving safety, reliability and service life of the element while having simple process and high efficiency.

Description

technical field [0001] The invention relates to the technical field of resistance components, in particular to the technical field of thermistor components, in particular to a polymer thermistor component and a manufacturing method thereof. Background technique [0002] In recent years, positive temperature coefficient polymer thermistor components have been widely used in communication lines for over-current and over-temperature protection, especially for over-current protection devices used in lithium battery line protection of mobile phones, which need to be used as protective polymers Thermistor components have the characteristics of small resistance and quick recovery to the initial resistance value after action, that is, high resistance repeatability and good recovery of PTC effect. [0003] Under normal conditions, the polymer thermistor components remain in a low-temperature, low-resistance state in the circuit. Once under the condition of overcurrent or overheating...

AI Technical Summary

Problems solved by technology

If the contact between the PTC chip and the metal nickel foil electrode is poor, the initial resistance of the polymer thermistor component will be too large, resulting in unqualified initial resistance; at the same time, because the PTC chip and the metal foil nickel electrode only pass through the organic material and The physical contact between metal materials, if the polymer thermistor components are repeatedly moved, the mechanical stress caused by the difference in thermal expansion between the PTC chip and the metal foil nickel electrode will cause the poor contact to continue to expand, making the polymer thermistor The subsequent resistance of components increases rapidly, resulting in poor resistance recovery of polymer thermistor components and shortening the service life of polymer thermistor components

[0004] By increasing the surface roughness of the metal foil electrode in contact with the PTC chip, the contact resistance can be reduced, but only physical contact is increased between the PTC chip and the metal foil electrode, and there are still more air bubbles; the contact resistance cannot be reduced To meet the ideal requirements, in order to continue to reduce the contact resistance, it is difficult to improve the surface roughness of metal nickel-plated foil electrodes using existing technologies

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