Electrical device and assembly
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United States of America Patent
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Mar 26, 2002
Grant Date -
N/A
app pub date -
Aug 31, 1999
filing date -
Aug 31, 1999
priority date (Note) -
Expired
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Abstract
A circuit protection device is formed from a resistive element composed of a PTC conductive polymer composition and two electrodes. The conductive polymer composition contains ethylene/vinyl acetate copolymer having a vinyl acetate component of less than 30% by weight of the copolymer, and a melting point of at most 105.degree. C. Devices of the invention have a resistive element thickness of 0.025 to 0.25 mm; a crosslinking level equivalent to 1 to 20 Mrads; a surface area of at most 120 mm.sup.2 ; a resistance at 20.degree. C., R.sub.20, of at most 0.050 ohm; and a PTC anomaly from 20.degree. C. to (T.sub.m +5.degree. C.) of at least 10.sup.3.5. The devices can be used as part of an assembly in which the device is in contact with a battery, e.g. a rechargeable battery.
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