PTC DEVICE AND SECONDARY BATTERY HAVING SAME

In order to increase the compactness of electric devices such as a PTC device, a battery pack comprising a PTC device and a secondary battery, and a dry cell secondary battery, the disclosed PTC device comprises: (1) a PTC element that comprises (A) a layer polymer PTC element comprising (a1) a conductive filler and (a2) a polymer material, and (B) a metal electrode disposed at both surfaces of the polymer PTC element; and (2) a lead that is connected to the metal electrode by a conductive material and of which at least a portion is positioned on the metal electrode of the PTC element. The exposed portion of the above-mentioned conductive material is covered by a protective member comprising a polypropylene resin, a nylon resin, or an epoxy resin.