Liquid-Metal Mesh Heat Transfer Structure for Stable Die Cooling
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Solution Overview
Problem
Liquid metal used for heat transfer in electronic devices is susceptible to leakage due to fluidity, which can cause short-circuiting and reduce heat transfer performance, especially under vibration and impact.
Innovation Solution
A porous material, such as a mesh impregnated with liquid metal, is used between a heat generation element and a heat radiation element, with a central heat generation element abutting range portion impregnated with liquid metal and non-abutting range portions fixed to the heat radiation element via sheet materials, preventing leakage and displacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If liquid metal is used as heat transfer fluid, then heat transfer performance is improved, but leakage occurs due to fluidity
Solution Approach 1:
The patent uses a porous material as a heat transfer structure that is impregnated with liquid metal. The porous structure retains the liquid metal through capillary action while allowing heat transfer, preventing leakage despite the liquid metal's fluidity. This resolves the contradiction by maintaining both high heat transfer performance and preventing substance loss.
2Loss of substance
If porous material is used to prevent leakage, then liquid metal retention is improved, but displacement occurs under vibration and impact
Solution Approach 1:
The patent introduces a pressing force as an intermediary mechanism that applies compression to the porous material, securing it between the heat generating component and heat radiation element. This prevents displacement under vibration and impact while maintaining the liquid metal retention capability, resolving the stability issue.
3Stability of the object's composition
If pressing force is applied to fix porous material, then displacement is prevented, but heat transfer performance may decrease
Solution Approach 1:
The patent carefully controls the pressing force parameter to achieve optimal fixation without excessive compression. By adjusting this parameter, the system maintains both stable porous material positioning and adequate heat transfer performance, preventing the degradation of thermal conductivity.
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
Prevents leakage of liquid metal and maintains heat transfer performance by securely fixing the porous material, ensuring stable heat transfer without reducing thermal conductivity.
Implementation Method 1
a heat generation element abutting range portion that is provided at a central portion of the porous material, is impregnated with a heat transfer fluid, and abuts on a surface of the electric component to receive heat
Implementation Method 2
The liquid metal impregnated in the mesh is maintained with almost no leakage
Implementation Method 3
the liquid metal having fluidity leaks from a gap between the die and the heat radiation element due to a repetitive force received from the die and the heat radiation element
Data Source
AI summary
A heat radiation structure includes a mesh that abuts on a surface of a die, and a vapor chamber that interposes the mesh between the surface of the die and the vapor chamber. The mesh includes a heat generation element abutting range portion that is provided at a central portion of the mesh, is impregnated with a liquid metal, and abuts on the surface of the die to receive heat, and a pair of heat generation element non-abutting range portions that continuously extends from both sides of the heat generation element abutting range portion and does not abut on the surface of the die. Each of the pair of heat generation element non-abutting range portions is fixed to the vapor chamber via a sheet material. Each of a pair of the heat generation element non-abutting range portions is interposed between a pair of the sheet materials.