Metal Encased Graphite Heat Pipe for Wearable Thermal Management
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Solution Overview
Problem
Head-mounted displays and other wearable devices face challenges in efficiently managing heat generated by high-powered electronic components, as traditional thermal management methods are often bulky and inefficient, particularly in wearable form factors where thermal dissipation is critical for user comfort and device longevity.
Innovation Solution
A metal-encased multilayer stack of graphite sheets is used as a passive thermal conductor, with each sheet having high thermal conductivity along one axis and lower conductivity along another, aligned parallel to the length of the stack, and thermally bonded to heat-producing components and the exterior surface of the optical mounting structure, enhancing heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If traditional thermal management methods are used, then heat dissipation is achieved, but the device becomes bulky and inefficient
Solution Approach 1:
The patent employs a composite structure consisting of multiple graphite sheets stacked together and enclosed within a metal housing. The graphite sheets provide high thermal conductivity for efficient heat dissipation, while the metal enclosure provides structural support and additional thermal management. This composite approach enables effective heat dissipation in a compact form factor suitable for wearable devices.
Solution Approach 2:
The patent utilizes thin graphite sheets as the primary thermal management component. These thin-film structures provide high thermal conductivity while occupying minimal volume. The multiple thin sheets are stacked to create an effective thermal management solution that does not increase device bulk significantly.
2Loss of energy
If thermal management components are added to wearable devices, then heat dissipation improves, but device weight increases
Solution Approach 1:
The patent uses thin graphite sheets as the core thermal management component. These sheets provide high thermal conductivity while maintaining extremely low weight due to their thin profile. The thin-film approach allows effective heat dissipation without significantly increasing wearable device weight.
Solution Approach 2:
The combination of lightweight graphite sheets with a thin metal enclosure creates a composite structure that optimizes the weight-to-thermal-performance ratio. The graphite provides superior thermal management per unit weight, while the minimal metal housing provides necessary structural support without adding excessive weight.
3Power
If high-powered electronic components are used, then device functionality improves, but heat generation increases
Solution Approach 1:
The patent converts the harmful heat generated by high-powered electronic components into a manageable thermal flow. The graphite sheets and metal enclosure work together to channel and redirect the heat away from sensitive components and toward areas where it can be safely dissipated, effectively converting the problem of heat generation into a controlled thermal management process.
Solution Approach 2:
The graphite sheets and metal enclosure serve as thermal intermediaries between the heat-generating electronic components and the external environment. These materials facilitate controlled heat transfer, acting as a mediator that manages the thermal interface between the high-powered components and the wearable device structure.
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 effectively directs heat away from sensitive components, improving device performance and user comfort by providing efficient thermal management in wearable devices, even in compact and lightweight designs.
Implementation Method 1
each sheet has a plane high thermal conductivity along a first axis and a plane of lower thermal conductivity along a second axis
Implementation Method 2
The metal encased multilayer stack of graphite sheets is thermally bonded to the heat producing electrical components and to an exterior surface of the optical mounting structure
Data Source
AI summary
A metal encased multilayer stack of graphite sheets used as a passive thermal conductor. In the stack, each sheet has a plane high thermal conductivity along a first axis and a plane of lower thermal conductivity along a second axis. The stack is created to have a three-dimensional shape including a length and a width, and the first axis is aligned parallel to said length, the multilayer stack having a height less than the width. A first metal structure surrounds the multilayer stack of graphite sheets, with the metal structure encasing the multilayer stack along the length, width and height of the multilayer stack.