Surface-adhered type over-current protection element and manufacturing method

Abstract

The invention discloses a surface-adhered type over-current protection element with a resistance positive temperature coefficient effect, and a manufacturing method. The surface-adhered type over-current protection element comprises conductive composite material chips, a first conductive connecting hole, a second conductive connecting hole and an adhesion layer, wherein the conductive composite material chips are upper-lower structured overlapped layers with the resistance positive temperature coefficient effect; the first conductive connecting hole is electrically connected with a first conductive electrode and a third conductive electrode and is not directly electrically connected with a second conducive electrode and a fourth conductive electrode; the second conductive connecting hole is electrically connected with the second conductive electrode and the fourth conductive electrode and is not directly electrically connected with the first conductive electrode and the third conductive electrode; the adhesion layer is arranged between the upper-layer chip and the lower-layer chip so as to solidly connect the upper-layer chip with the lower-layer chip. Compared with an ordinary surface adhered type over-current protecting element, the surface-adhered type over-current protection element has the characteristics of small thickness and high holding current, has the characteristics that a pin type structure is easy in heat conduction and heat radiation, is convenient to be in lap joint with other protectors, and has the characteristics of convenience to mount.

Description

technical field [0001] The invention relates to an over-current protection element and a manufacturing method thereof, in particular to a surface mount type over-current protection element with resistance positive temperature effect and a manufacturing method thereof. Background technique [0002] Positive temperature coefficient overcurrent protection components (PTC) based on conductive composite materials have been widely used in communication, computer, automobile, industrial control, household appliances and many other fields, and are used in the overcurrent protection setting of circuits. In a normal state, the current in the circuit is relatively small, and the temperature of the thermistor is low, but when a large current caused by a circuit fault passes through this self-resetting fuse, its temperature will suddenly rise to the "off" temperature , causing its resistance value to become very large, so that the circuit is in an approximately "open circuit" state, ther...

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Problems solved by technology

CN201210028641.9 and CN200610000389.5 mentioned a multi-layer stacked structure of the overcurrent element structure, and CN200610000389.5 invented a multi-layer stacked structure, but there is an insulating layer between the conductive composite PTC material layers, which This structure not only increases the thickness of the product, but also reduces the heat transfer of th

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