Electric heating device

A positive temperature coefficient (PTC) heating element comprising:

• a heating element casing which fits, as a structural unit, at least one PTC element having two main side surfaces and contact plates that energize said at least one PTC element and form contact strips for an electrical plug connection in order to electrically connect electrodes that are electrically connected to said at least one PTC element, wherein said at least one PTC element is covered with an insulation layer on each of the two main side surfaces, wherein said heating element casing comprises:
• an injection-molded plastic frame which contacts said insulation layers only at edges thereof and which defines oppositely disposed frame openings, behind said frame opening, wherein said at least one PTC element with the two main side surfaces is located, wherein main side surfaces of said insulation layers are exposed by and are provided within the oppositely disposed frame openings, and
• wherein said plastic frame is connected, in one or more of a material-fit and a positive-fit manner, to said insulation layers and the at least one PTC element between the two insulation layers.

A positive temperature coefficient (PTC) heating element comprising:

• a heating element casing which fits, as a structural unit, at least one PTC element having two main face sides and contact plates that energize said at least one PTC element and form contact strips for an electrical plug connection in order to electrically connect electrodes that are electrically connected to said at least one PTC element, wherein said at least one PTC element is covered with an insulation layer on each of the two main side surfaces, wherein each of the insulation layers has rims, and wherein said heating element casing comprises:
• a plastic frame which is made of an elastomeric plastic material and which defines oppositely disposed frame openings, wherein said plastic frame is joined to said insulation layers by injection molding the elastomeric plastic material around only the rims of the insulation layers, wherein the plastic frame provides a watertight seal around the insulation layers, and wherein the frame openings of said plastic frame expose the insulation layers, and
• wherein said plastic frame is connected, in one or more of a material-fit and a positive-fit manner, to said insulation layers and the at least one PTC element between the two insulation layers.