PTC devices and their preparation

Details PTC devices and their preparation PTC devices and their preparation

1988-09-29

1991-08-13

Reynolds, Bruce A.

Electric heating

Heating devices

With heating unit structure

219505, 219 93, 219 94, 338 22R, H05B 312

Patent

active

050398440

ABSTRACT:
A process for producing a PTC device comprising the steps of forming a laminate comprising a PTC composition and at least two electrode plates having the PTC composition sandwiched therebetween, opposing the surface of a lead plate to be electrically connected to each of the electrodes, to the surface of each of the electrode plates of the laminate while contacting at a narrow area, and then passing a current between the electrode and the lead via the narrow contact surface to weld them. By this process, there is obtained a PTC device having, at a portion of the joining interface between each electrode plate and each lead plate, a nugget formed by melting both the plates. This PTC device has a low contact resistance between the PTC composition and the electrode plates.

REFERENCES:
patent: 3231710 (1966-01-01), Barnet
patent: 4650951 (1987-03-01), Koga
patent: 4787135 (1988-11-01), Nagahori

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