Adaptive Thermal Interface for ECU Cooling Tolerance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for cooling electronic control units (ECUs) face challenges due to manufacturing tolerances, which lead to unpredictable cooling performance and potential damage from excessive compression of thermal interface materials, and require significant manufacturing efforts for individually dimensioned heat spreaders.
Innovation Solution
A method involving a printed circuit board with electric components, a lower layer of thermal interface material, an integrated heat spreader, and an upper layer of thermal interface material, where the upper layer's thickness is selected based on the distance between the heat spreader and the PCB, allowing for precise adaptation to tolerances and simplifying manufacturing by using commercially available materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a layer of thermal interface material is arranged in a gap between the electric component and the heat spreader, then thermal energy transfer is enabled, but the cooling performance becomes unpredictable due to high tolerances in gap size and material compression
Solution Approach 1:
The patent changes the parameter of heat spreader thickness to compensate for tolerance variations in the assembly. By providing heat spreaders with different thicknesses (e.g., 0.5mm, 1.0mm, 1.5mm), the system can adapt to different gap sizes resulting from manufacturing tolerances of the PCB, electric component, and housing, thereby ensuring consistent thermal interface material compression and predictable cooling performance
Solution Approach 2:
The patent introduces adaptability into the system by selecting heat spreaders dynamically based on the actual gap measurement. Instead of using a fixed-thickness heat spreader for all assemblies, the method allows selection from multiple thickness options to match the specific gap dimensions, making the thermal interface adaptable to manufacturing variations
2Reliability
If individually dimensioned heat spreaders are used to compensate for manufacturing tolerances, then cooling performance becomes predictable, but manufacturing efforts and costs increase significantly
Solution Approach 1:
The patent segments the heat spreader product line into discrete thickness categories (e.g., 0.5mm, 1.0mm, 1.5mm) that can be manufactured using standard processes. This segmentation allows for simplified manufacturing of each variant while providing enough variety to cover typical tolerance ranges, avoiding the need for complex individual customization
Solution Approach 2:
The patent uses multiple copies of heat spreaders with different standard thicknesses rather than creating unique custom pieces. Each thickness variant can be mass-produced using conventional manufacturing methods, and the appropriate copy is selected based on the measured gap, significantly reducing manufacturing complexity compared to individual milling
3Volume of moving object
If the gap between electric component and heat spreader is very small, then assembly is compact, but the thermal interface material is compressed excessively and may damage the electric component
Solution Approach 1:
The patent applies beforehand cushioning by selecting a thinner heat spreader when the gap is small, which prevents excessive compression of the thermal interface material. The heat spreader thickness is chosen in advance based on the measured gap to ensure the compression remains within safe limits, cushioning the electric component from potential damage
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 approach enables predictable and enhanced cooling performance while reducing manufacturing complexity by avoiding the need for individually manufactured heat spreaders, ensuring reliable operation and safety of ECUs.
Implementation Method 1
a layer of thermal interface material, also known as TIM, is arranged in a gap between the electric component and the heat spreader
Implementation Method 2
an integrated heat spreader on a top surface of the electric component
Implementation Method 3
The heat sink may comprise cooling ribs and/or flow channels for guiding a cooling medium such as air, oil, and/or water
Implementation Method 4
a heat sink thermally connected to the electric component
Data Source
AI summary
A method for manufacturing an electronic control unit includes providing a printed circuit board with at least one electric component attached thereon. The method includes arranging a lower layer of thermal interface material on top of the electric component and arranging an integrated heat spreader on top of the lower layer. The method includes determining the distance of the top surface of the integrated heat spreader perpendicular to the printed circuit board and arranging an upper layer of thermal interface material on the top surface of the integrated heat spreader. A layer thickness of the upper layer is selected based on the determined distance. The method includes arranging a heat sink with a contact surface such that the contact surface contacts the upper layer.