Monolithic Graphite Thermal Management for Stacked Motherboards
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Solution Overview
Problem
Existing electronic devices face challenges in thermal management, particularly in portable devices where active cooling methods are inefficient and passive cooling solutions lack effective heat dissipation without using cooling mediums or forced convection systems.
Innovation Solution
A thermal management system utilizing a monolithic flexible graphite element with a thickness of at least 150 microns and thermal conductivity of at least 700 W/mK, devoid of internal adhesives, is used in operative contact with a heat source comprising multiple electronic components on a stacked motherboard, providing efficient heat dissipation without additional heat dissipation elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If active cooling methods (heat pipe, vapor chamber, fan) are used, then heat dissipation capability is improved, but device complexity and energy consumption increase
Solution Approach 1:
The patent extracts and eliminates the cooling medium (fluid) from the heat pipe system, using only solid graphite material to conduct heat. This removes the need for sealed chambers, working fluids, and phase change mechanisms while maintaining heat dissipation functionality through pure thermal conduction in the graphite element.
Solution Approach 2:
The patent changes the physical state parameters by using solid graphite with high thermal conductivity (≥700 W/mK) instead of relying on phase change mechanisms. The graphite element's exceptional in-plane thermal conductivity allows efficient heat spread without requiring the complex phase transition cycles of traditional heat pipes.
2Device complexity
If passive cooling without cooling medium is used, then device simplicity is improved, but heat dissipation effectiveness deteriorates
Solution Approach 1:
The patent employs composite material strategy by using highly oriented pyrolytic graphite (HOPG) with exceptional thermal conductivity properties. The graphite's layered crystalline structure provides superior in-plane heat conduction (≥700 W/mK), enabling passive cooling to achieve effectiveness previously only attainable with active cooling systems.
Solution Approach 2:
The patent applies local quality by creating a graphite element with highly anisotropic thermal conductivity - extremely high in-plane conductivity (≥700 W/mK) for efficient lateral heat spread, while maintaining lower through-plane conductivity. This directional thermal management optimizes heat dissipation from specific hot spots on the motherboard.
3Temperature
If multiple layers of synthetic graphite with internal adhesives are used, then thermal management is improved, but manufacturing complexity and potential thermal resistance increase
Solution Approach 1:
The patent merges multiple graphite layers into a single monolithic graphite element without internal adhesives or binders. This integration eliminates the complexity of layer-by-layer assembly, removes potential thermal resistance at adhesive interfaces, and simplifies manufacturing while maintaining effective thermal management through the unified graphite structure.
4Length of moving object
If thin device design is pursued, then portability is improved, but thermal management capability deteriorates
Solution Approach 1:
The patent uses a thin graphite element (≥150 microns thickness) that functions as a flexible thermal management film. Despite its thin profile, the graphite's exceptional in-plane thermal conductivity enables effective heat dissipation, allowing the device to maintain both thin design for portability and adequate thermal management capability.
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 minimizes surface temperatures below the pain threshold, maintaining device performance during normal operation and charging, outperforming conventional synthetic graphite stack-ups and vapor chamber controls in reducing screen temperatures and dissipating heat from CPUs and GPUs.
Implementation Method 1
The graphite element has a thermal conductivity of at least about 700 W/mK. The thermal management system is in operative contact with a heat source which comprises more than one electronic component.
Data Source
AI summary
An electronic device having a thermal management system is provided. The thermal management system has a monolithic graphite element having a thickness of at least 150 microns. The graphite element has a thermal conductivity of at least about 700 W/mK. The graphite element is devoid of an internal adhesive, i.e., the graphite element is monolithic. The thermal management system is in operative contact with a heat source which comprises more than one electronic component. Preferably, the more than one electronic component is disposed on a stacked motherboard.