Electrical resistors – Resistance value responsive to a condition – Current and/or voltage
Patent
1999-09-29
2000-09-26
Easthom, Karl D.
Electrical resistors
Resistance value responsive to a condition
Current and/or voltage
338328, 338331, 429 7, 429 9, H01C 710
Patent
active
061247812
ABSTRACT:
A battery protection device includes an upper foil electrode laminated to the upper surface of a conductive polymer PTC layer, and a lower foil electrode laminated to the lower surface of the PTC layer. An isolated portion of the lower electrode is formed by creating an annular isolation gap in the lower electrode. A first via is formed through the upper electrode, the PTC layer, and the isolated portion of the lower electrode. The diameter of the first via is smaller than the diameter of the isolated electrode portion, so that an annular area of the isolated electrode portion is left between the opening and the isolation gap. The internal wall surface of the first via and the annular electrode area are plated with a conductive metallization layer, which forms a first contact seat that is conductively connected by the metallized surface of the first via with the upper electrode. A first contact element is fixed to the first contact seat. An area of the lower electrode, spaced from the isolated portion, is metal-plated. A second via is formed through the upper electrode, the PTC layer, and the metal-plated area of the lower electrode, with an opening in the metal-plated area. The diameter of the second via is smaller than that of the metal-plated area, so that a second contact seat is defined around the opening of the second via in the metal-plated area, to which a second contact element is fixed.
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Barrett Andrew Brian
Hogge Steven D.
Bourns Inc.
Easthom Karl D.
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