PTC Heating Element Insulation for Heat Dissipation and Moisture Protection
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Solution Overview
Problem
Existing PTC heating elements in electric heating devices for motor vehicles face issues with heat dissipation and insulation, particularly at high voltages, leading to potential leaks and moisture ingress due to the design of the insulating layers and sealing lips, which compromise the electrical components.
Innovation Solution
A PTC heating element with a frame made of electrically non-conductive material encloses the PTC element and conductor tracks, using thin, ceramic insulating layers with a film applied parallel to the main side surfaces, and a metal structure permeable to fluid for improved heat dissipation and insulation, preventing moisture ingress and enhancing structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If insulating layers are made thin to improve heat dissipation, then heat dissipation efficiency is improved, but electrical insulation reliability deteriorates
Solution Approach 1:
The patent uses a composite sealing structure combining a first sealing lip made of elastomeric material and a second sealing lip made of thermoplastic material. This composite approach allows the thin insulating layers to maintain both heat dissipation efficiency and electrical insulation reliability through the complementary properties of different materials working together.
Solution Approach 2:
The patent incorporates redundant sealing lips (both elastomeric and thermoplastic) that provide backup insulation and sealing functions. This prior cushioning ensures that even if one sealing mechanism is compromised by thin insulating layers, the other provides sufficient electrical insulation and sealing protection.
2Object-affected harmful factors
If sealing lips are made bulky to improve moisture protection, then moisture ingress prevention is improved, but device complexity and weight increase
Solution Approach 1:
The patent divides the sealing function into two separate sealing lips with distinct material compositions and functions. The first sealing lip (elastomeric) and second sealing lip (thermoplastic) are segmented to perform different aspects of sealing, reducing the complexity of any single sealing component while maintaining overall effectiveness.
Solution Approach 2:
The patent applies different material properties to different parts of the sealing structure. The elastomeric material provides flexibility and initial sealing, while the thermoplastic material provides structural support and secondary sealing. This local quality differentiation optimizes moisture protection without requiring uniformly bulky sealing components throughout.
3Strength
If frame structure is made robust to improve structural integrity, then structural strength is improved, but heat dissipation efficiency deteriorates
Solution Approach 1:
The patent uses thin film insulating layers (first and second insulating layers) that provide sufficient electrical insulation and structural definition while maintaining excellent heat dissipation characteristics. These thin films allow heat to pass through efficiently while the frame structure provides the necessary mechanical strength and structural integrity.
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 effective heat decoupling and insulation, preventing fouling and moisture ingress while allowing efficient heat dissipation through the main side surfaces, thereby ensuring the reliability and efficiency of the PTC heating element in motor vehicle applications.
Implementation Method 1
insulating layers which bear, in a heat-conductive manner, against oppositely disposed main side surface of the PTC element
Implementation Method 2
frame which is made of an electrically non-conductive material and which encloses at least one PTC element
Data Source
AI summary
A PTC heating element for an electric heating device includes frame which is made of electrically non-conductive material and which encloses at least one PTC element, conductor tracks electrically connected to the PTC element, and insulating layers bearing, in a heat-conductive manner, against an oppositely disposed main side surface of the PTC element. The frame has contact strips which project over itself and which are electrically conductively connected to the conductor tracks for energizing the PTC element with different polarities. In order to provide an electrically well-insulated PTC heating element allows good heat coupling, s a film respectively covers the outer surfaces of the insulating layers. A corresponding PTC heating element may be provided in a circulation chamber of the electric heating device. In this case, the conductor tracks are electrically connected to the PTC element, protrude through a partition wall of the electric heating device, and are exposed and electrically connected in a connection chamber. The connection chamber is separated by the partition wall from the circulation chamber.