PTC heating assembly and method for manufacturing the same

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Solution Overview

Problem

Existing PTC heating assemblies for motor vehicles require complex manufacturing processes, multiple components, and precise assembly for efficient heat dissipation, which can be compromised by vibrations and varying temperatures, making them unsuitable for mass production with consistent quality.

Innovation Solution

A PTC heating assembly with a pre-assembled heating cell and undersized heater housing, where the heating cell is held under pretension between opposing walls, eliminating the need for direct electrical contact and additional insulation, and allowing for simpler assembly and reduced component count.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If multiple components and complex assembly structures are used to ensure good heat dissipation, then heat transfer efficiency is improved, but device complexity and manufacturing difficulty increase

Engineering Contradiction:

Improveheat transfer efficiencyVSAvoidnumber of components

Core Design Contradiction:

TemperatureVSDevice complexity

Solution Approach 1:

The heating cell is integrated directly into the heater housing as a single pre-assembled unit, merging the PTC element, contact plates, insulation layers, and housing into one component that achieves good heat dissipation without requiring multiple separate parts

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The heating cell is pre-assembled with all necessary components (PTC element, contact plates, insulation) before insertion into the heater housing, ensuring proper alignment and heat contact without requiring complex assembly steps during final installation

Inventive Principle:

Principle #10Preliminary action

2Reliability

If precise assembly and flawless sealing are required to maintain elasticity and heat dissipation, then reliability is improved, but manufacturing precision requirements increase

Engineering Contradiction:

Improvesealing reliabilityVSAvoidassembly precision

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The heating cell is designed to be self-contained and self-sealing, with the insulation layers and contact plates inherently maintaining their positions and sealing integrity without requiring external adjustment or high-precision assembly procedures

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The design anticipates potential assembly issues by pre-configuring the heating cell with built-in tolerance compensation, allowing for straightforward insertion into the heater housing without requiring ultra-precise alignment while still ensuring reliable sealing and heat transfer

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

3Temperature

If thin wall thickness is used in the heater housing for good heat dissipation, then heat transfer is improved, but structural strength and sealing capability deteriorate

Engineering Contradiction:

Improveheat dissipation efficiencyVSAvoidhousing strength

Core Design Contradiction:

TemperatureVSStrength

Solution Approach 1:

The heater housing utilizes composite construction combining thin-walled metal structure for heat dissipation with integrated insulation layers and sealing elements that provide the necessary structural reinforcement and sealing capability without requiring thick walls

Inventive Principle:

Principle #40Composite materials

4Reliability

If direct electrical contact is eliminated between PTC element and heater housing, then safety is improved, but additional insulation components are required

Engineering Contradiction:

Improveelectrical safetyVSAvoidinsulation components

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The insulation function is merged with the structural housing components, where the heater housing itself and integrated insulation layers provide both mechanical support and electrical isolation, eliminating the need for separate insulation components

Inventive Principle:

Principle #5Merging (Combining)

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

This design enables reproducible, economical, and lightweight PTC heating assemblies with improved heat transfer and reduced manufacturing complexity, suitable for mass production and operation under diverse conditions.

Implementation Method 1

For good efficiency, it is important that the PTC element is connected in a good heat-conducting manner to the heat-emitting outside of the heater housing

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Implementation Method 2

an insulating layer made of a ceramic plate with a plastic film, which are elastically supported against the position frames by means of an elastic seal so that a compressive force acting from outside at right angles to the main side surfaces of the PTC element can act on the layers

Methodology Applied

Scientific EffectElasticity: Elasticity

Data Source

PatentUS12049124B2PTC heating assembly and method for manufacturing the same

Publication Date: 2024.07.30 EBERSPACHER CATEM GMBH & CO KG

AI summary

A PTC heating assembly includes a heating cell comprising a PTC element and conductor elements electrically abutting the PTC element. The heating cell is accommodated in a heater housing. The heater housing is manufactured with undersize relative to the heating cell so that the heating cell, after insertion into the heater housing, is held under pretension between mutually opposing walls of the heater housing. Accordingly, in the method according to the invention, the heater housing is elastically widened when the heating cell is inserted into the heater housing.