PTC Heating Element Frame Design for Lightweight Heat Decoupling
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Solution Overview
Problem
Existing PTC heating elements are bulky, complex, and inefficient due to inadequate heat decoupling, making them unsuitable for the automotive industry where lightweight and cost-effective solutions are required.
Innovation Solution
A PTC heating element with an injection-molded plastic frame that encloses the insulation layer only at the edge, allowing for efficient heat decoupling and using elastomeric plastic for a fluid-tight seal, where the insulation layer directly abuts the PTC element and energization occurs via sheet metal strips on the main side surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the heating element casing completely covers the PTC element, then mechanical protection is improved, but heat decoupling deteriorates and device complexity increases
Solution Approach 1:
The heating element casing is segmented into a frame structure with openings rather than a complete enclosure. The frame-shaped heating element casing surrounds the insulation layer and narrow edge region of the PTC element but leaves frame openings that expose the main side surfaces, achieving both protection and heat decoupling
Solution Approach 2:
Different regions of the PTC element receive different levels of coverage: the edge region is covered by the plastic frame for mechanical protection, while the main side surfaces remain exposed for efficient heat decoupling. The insulation layer is applied selectively to cover the main side surfaces while leaving edges accessible
2Stability of the object's composition
If the heating element casing is designed as a complete enclosure, then structural stability is improved, but device weight and complexity increase
Solution Approach 1:
The casing is designed as a frame structure rather than a complete enclosure, removing unnecessary material while maintaining structural stability through the frame geometry and strategic positioning of supporting components
Solution Approach 2:
The complete enclosure is extracted to only the essential frame structure, removing the portions that would add weight without providing proportional structural benefit. The frame openings eliminate unnecessary material while the frame itself provides sufficient structural support
3Reliability
If contact plates completely cover the PTC element main side surfaces, then electrical connection is improved, but heat decoupling and manufacturing simplicity deteriorate
Solution Approach 1:
The contact plates cover only the necessary portions of the PTC element main side surfaces for reliable electrical connection, rather than completely covering all surfaces. This partial coverage maintains electrical reliability while allowing heat decoupling from exposed regions
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 results in a lightweight, economically manufactured PTC heating element with improved heat decoupling and sealing, enhancing operational efficiency and manufacturing feasibility for automotive applications.
Implementation Method 1
PTC heating element with a heating element casing which fits at least one PTC element and contact plates that energize the PTC element
Implementation Method 2
good heat decoupling of the heat generated by the PTC element is desired, since the PTC elements have self-regulating properties and can only be operated with poor efficiency if the heat generated by the PTC element is removed only inadequately
Data Source
AI summary
A PTC heating element includes a heating element casing that fits, as a structural unit, at least one PTC element and contact plates that energize the PTC element and that form contact strips for an electrical plug connection in order to electrically connect electrodes that are electrically connected to the PTC element. The PTC element is covered with an insulation layer at least on one of its two main side surfaces. In order to provide such a heating element casing that is inexpensive to produce and of a light-weight configuration, the PTC heating element comprises an injection-molded plastic frame which encloses the insulation layer only at the edge and which defines oppositely disposed frame openings, behind which the PTC element with its main side surfaces is located.