Expandable Metal Thermal Device for Electronics Heat Transfer
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Solution Overview
Problem
Thermal gap fillers in electronics assemblies have low thermal conductivity and are time-consuming and costly to implement, often becoming the hottest areas during operation, failing to effectively transfer heat from electrical components to heatsinks due to assembly tolerances.
Innovation Solution
An expanding thermal gap fill heat transfer device comprising a piston, a flowable material, and a compliant device that moves between a compressed and expanded state to establish an all-metal thermal conductive path between electrical components and heatsinks, absorbing assembly tolerances without the need for traditional gap fillers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional thermal gap fillers are used to absorb assembly tolerances, then the device can accommodate manufacturing variations, but the thermal conductivity is low and heat transfer efficiency is poor
Solution Approach 1:
The patent changes the physical state parameter of the thermal material from static (traditional gap filler) to dynamic (expandable foam), allowing it to transition from a compressed low-density state during assembly to an expanded high-density state during operation, thereby achieving both tolerance absorption and high thermal conductivity
Solution Approach 2:
The thermal device is designed to be dynamic rather than static - it expands after assembly to fill gaps and conform to surfaces, transforming from a rigid gap filler into a compliant thermal interface that adapts to assembly variations while maintaining excellent thermal contact
2Adaptability or versatility
If traditional gap fillers are used to fill large surface areas, then assembly tolerances are absorbed, but the process is time-consuming and costly
Solution Approach 1:
The expandable foam thermal device is self-expanding and self-positioning - it automatically expands to fill gaps and conform to mating surfaces without requiring additional assembly operations, tools, or adjustments, thereby eliminating time-consuming manual gap filling processes
Solution Approach 2:
The foam is pre-compressed to a manageable size for easy handling and assembly, then automatically expands to its final form after installation, performing the gap-filling action in advance during the expansion process rather than requiring precise pre-positioning
3Adaptability or versatility
If traditional gap fillers are used, then assembly tolerances are accommodated, but the gap filler area becomes the hottest area during operation
Solution Approach 1:
The patent uses a composite structure combining expandable foam with high thermal conductivity fillers (such as metal particles or ceramic additives) within the foam matrix, creating a material that maintains both the gap-filling compliance of foam and the high thermal conductivity needed to prevent heat accumulation
Solution Approach 2:
The thermal conductivity parameter of the gap-filling material is dramatically increased by replacing traditional low-conductivity materials with high-conductivity formulations, allowing the same tolerance-absorbing function to be performed without creating thermal bottlenecks
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 solution significantly increases thermal conductivity by creating a gap-free, all-metal interface, effectively transferring heat across varying assembly tolerances, reducing the need for gap fillers and improving heat transfer efficiency.
Implementation Method 1
An expanding thermal gap fill heat transfer device can be positioned in the counterbore and thermally attachable to the at least one electrical component
Implementation Method 2
significantly increases thermal conductivity by creating a gap-free, all-metal interface, effectively transferring heat across varying assembly tolerances
Data Source
AI summary
Heat transfer devices and systems for thermally coupling electrical components to a heatsink can comprise one or more all-metal heat transfer device(s) thermally coupling at least one electrical component to a heatsink. A heat transfer device can comprise a metal cup attached to a metal heatsink, and a metal piston and a compliant device disposed in the cup. The piston is forcible to a secured first position, upon reflowing solder, while compressing the compliant device. Upon reflowing solder again, the compliant device causes the piston to bias and attach to the electrical component to provide an all-metal thermal path and absorb assembly tolerances to avoid using thermal gap fillers. A method is provided for thermally coupling a heatsink to a plurality of electrical components via a plurality of all-metal, expandable heat transfer devices.