Patent ID: 8687336

Claim:
An over-current protection device having a top surface, a bottom surface and four lateral surfaces interconnecting the top and bottom surfaces, the four lateral surfaces defining four corners in which each of two adjacent lateral surfaces defines a corner therebetween, the over-current protection device comprising: a resistive device comprising a first electrode foil, a second electrode foil and a PTC material layer laminated therebetween, the PTC material layer, the first electrode layer and the second electrode layer extending along a first direction to form a laminated structure; a first insulation layer having a thickness of at least 0.03 mm and being disposed on a surface of the first electrode foil; a weld electrode layer having a thickness of at least 0.03 mm and being disposed on a surface of the first insulation layer; and at least one first conductive connecting member extending along a second direction substantially perpendicular to the first direction and electrically connecting the weld electrode layer and the first electrode foil, the first conductive connecting member being insulated from the second electrode foil, the first conductive connecting member comprising a through hole plated with a conductive film and penetrating through the resistive device and the first insulation layer and ending at an upper surface of the weld electrode layer; wherein the second electrode foil is configured to electrically coupled to a circuit board, the first electrode foil is configured to electrically couple to an electrode of a battery by a strip interconnect member welded to the weld electrode layer; wherein the association of the first insulation layer and the weld electrode layer has a thermal mass capable of withstanding welding the strip interconnect member without significant damage to the over-current protection device.