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Novel PTC thermosensitive element

A thermal element, a new type of technology, applied in the direction of resistors with positive temperature coefficients, etc., can solve the problems of small electrode resistance, low protection switch temperature, etc., and achieve the effect of small electrode resistance, low protection switch temperature, and large operating current

Inactive Publication Date: 2015-06-03
SHANGHAI CHANGYUAN WAYON CIRCUIT PROTECTION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the conductive part of the present invention selects unalloyed Cu or alloyed Cu with a mass content of Cu not less than 50%, the electrode resistance is small, which overcomes the defect that the electrode resistance of the existing PTC thermistor exceeds its body resistance, and can be used in large currents. While working in the circuit, there is a lower protection switch temperature

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] like figure 2 Shown in the structural representation of this embodiment:

[0034] Press the conductive composite base layer 2 respectively figure 1 As shown, it is placed between the upper metal foil 11 and the lower metal foil 12, and they are closely combined by thermocompression. The temperature of hot pressing is 180 degrees centigrade, and the pressure is 12 MPa, and the time is 10 minutes, and finally cold pressing on the cold press for 10 minutes to obtain figure 1 A conductive composite chip with positive temperature coefficient of resistance effect shown. Then, through the punching process, the conductive composite material chip is punched into a small chip of 3mm*4mm, and then the small chip is welded with the upper and lower conductive parts 31 and 32 with a copper content of more than 99.9% through a reflow soldering process to form a PTC heat sink. Sensitive components, such as figure 2 .

Embodiment 2

[0036] This embodiment has the same structure and manufacturing process as Embodiment 1, except that the areas of the upper and lower conductive parts 31', 32' are the same size as the area of ​​the chiplets.

Embodiment 3

[0038] This embodiment and embodiment 1 have the same structure and manufacturing process, except that the area of ​​the upper conductive part 31'' is the same size as that of the small chip, and the lower conductive part 32'' is longer than the small chip, which is convenient for circuit connection.

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Abstract

The invention discloses a novel PTC thermosensitive element which is widely applied to protection circuits of a mobile phone battery and a tablet computer battery. The novel PTC thermosensitive element consists of a conducting part, a conducting composite material layer with a resistance positive temperature coefficient effect and metal foils which are tightly combined to the upper surface and the lower surface of the conducting composite material layer with the resistance positive temperature coefficient effect, wherein the conducting composite material consists of a polymer and conducting filler, a base material of the conducting part is non-alloy Cu or alloy Cu, and the mass content of the Cu is less than 50 percent. The novel PTC thermosensitive element has advantages that when the novel PTC thermosensitive element works in the large-current circuit, the temperature of a protection switch is relatively low, and the large working current still can be maintained under the high temperature.

Description

technical field [0001] The invention relates to a novel PTC heat-sensitive element, which can work in a circuit with a large current and has a lower protection switch temperature, and can still maintain a relatively large operating current at a relatively high temperature. Background technique [0002] Thermistors with positive temperature coefficient of resistance can maintain a very low resistance value at normal temperature, and have the characteristics of sensitive response to temperature changes, that is, when an over-current or over-temperature phenomenon occurs in the circuit, its resistance will instantly increase to A high resistance value makes the circuit in an open circuit state to achieve the purpose of protecting circuit components. Therefore, a thermal element with a positive temperature coefficient of resistance can be connected to the circuit as a current sensing element. Such components have been widely used in electronic circuit protection components. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01C7/02
Inventor 杨铨铨方勇高道华温伟
Owner SHANGHAI CHANGYUAN WAYON CIRCUIT PROTECTION CO LTD
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