SURFACE-MOUNTED PPTC DEVICE WITH INTEGRAL WELDING PLATE

摘要

PROBLEM TO BE SOLVED: To provide a surface-mounted circuit protection device which includes a layered PTC resistive element.

SOLUTION: A surface-mounted circuit projection device (10) comprises: first and second principal planes; and a layered PTC resistive element (12) with thickness between the principal planes. A first electrode layer with substantially the same width as that of the first principal plane is formed of a first metal material of a type suitable to be soldered to a printed circuit board. A second electrode layer to be formed on the second principal plane includes structure for forming or regulating the welding plate (18). The metal welding plate has thermal mass and thickness capable of withstanding resistance microspot welding of strap interconnection (34) without sharply damaging the device. The device preferably forms a battery protection circuit which is surface-mounted on a printed circuit board assembly (20) and connected to a battery/cell by battery strap interconnection, and microspot welding of one of the battery strap interconnection is performed to the welding plate of the device.

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