PTC Heating Element Insulation Structure for Heat Transfer and Isolation
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Solution Overview
Problem
Existing electric heating devices for automotive vehicles face issues with electrical insulation of PTC elements, leading to potential short-circuiting and failure due to irregularities and impurities bridging the insulation layer, which can be life-threatening.
Innovation Solution
A PTC heating element with an electrical insulation layer comprising a film and an electrically insulating mass of good thermal conductivity, applied as a prefabricated hybrid film on the outside of strip conductors, which compensates for irregularities and maintains effective insulation while allowing for heat transfer, using a cross-linked silicone mass with filler particles for enhanced thermal conductivity and electrical insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a standard insulation film is used, then electrical insulation is provided, but irregularities and impurities can bridge the insulation layer causing short-circuiting
Solution Approach 1:
The patent applies a composite insulation structure consisting of a film layer and an electrically insulating mass layer with good thermal conductivity. This composite structure prevents bridging by irregularities and impurities while maintaining electrical insulation reliability and preventing short-circuiting in high-voltage applications.
Solution Approach 2:
The patent applies different materials with specific properties to different locations: a film provides base insulation, while an electrically insulating mass with good thermal conductivity is applied to specific areas to prevent bridging by irregularities and maintain both electrical insulation and heat transfer efficiency.
2Reliability
If an insulation layer is applied, then electrical insulation is improved, but heat transfer from PTC element to heat-emitting surface is reduced
Solution Approach 1:
The patent uses a composite insulation structure where the electrically insulating mass layer has good thermal conductivity properties. This allows the layer to provide necessary electrical insulation while maintaining efficient heat transfer from the PTC element to the heat-emitting surface, resolving the contradiction between insulation and heat transfer.
Solution Approach 2:
The patent specifies that the electrically insulating mass should have good thermal conductivity, changing the material parameter selection to simultaneously achieve electrical insulation and maintain heat transfer efficiency, rather than using traditional insulators with poor thermal conductivity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides reliable electrical insulation and efficient heat transfer, ensuring safe operation of PTC elements with improved thermal conductivity and mechanical properties, achieving specific dielectric strength, volume resistivity, and creep resistance, suitable for high-voltage applications in automotive vehicles.
Implementation Method 1
an electrically insulating mass of good thermal conductivity applied thereto
Implementation Method 2
a heat-generating element in an electric heating device consists of at least one PTC element
Data Source
AI summary
A PTC heating element is provided that includes including a PTC heating element strip conductors via which the PTC element is powered and at least one of which is insulated on an outer surface with an electrical insulation layer. In order to provide improved insulation while maintaining adequate heat transfer from the PTC element to the heat-emitting surface through the electrical insulation layer, the electrical insulation layer comprises a film and an electrically insulating mass of good thermal conductivity applied to the film. Also provided is an electric heating device for an automotive vehicle that is provided with at least one PTC heating element of such a type.