Heat Conductive Sheet With Edge Insulation For Short Circuit Prevention
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Solution Overview
Problem
High-performance electronic apparatuses generate excessive heat, which can adversely affect heat-generating and other electronic components, leading to operational issues, and existing heat conductive sheets either fail to efficiently dissipate heat or pose risks of short circuits and heat-related problems.
Innovation Solution
A heat conductive sheet structure comprising a graphite heat dissipating sheet, a first heat insulating layer with lower thermal conductivity, a first sheet with a protruding portion for hermetic sealing, and a second sheet with a protruding portion for thermal insulation, where the heat insulating layers are designed to surround the graphite sheet and prevent heat transmission along its edges, using materials like polyimide resin, acrylic or silicone adhesive tapes, and air-filled gaps for enhanced insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a heat conductive sheet uses graphite with high thermal conductivity to dissipate heat, then heat dissipation efficiency is improved, but heat may be transmitted to other components causing short circuits or heat-related problems
Solution Approach 1:
The patent applies local quality by creating directional thermal conductivity in the graphite sheet, where the in-plane thermal conductivity is high for heat dissipation, while the through-thickness thermal conductivity is low to prevent heat transmission to other components. This is achieved through the specific graphite crystal orientation and the layered structure with heat insulating layers at the edges.
Solution Approach 2:
The patent segments the heat conductive sheet into distinct functional layers: a graphite heat dissipating sheet for primary heat conduction, heat insulating layers at the edges to block heat transmission paths, and protective layers for sealing. This segmentation allows each layer to perform its specific function optimally.
2Object-affected harmful factors
If heat insulating layers are added around the graphite sheet to prevent heat transmission, then heat isolation is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple functions into the heat insulating layers: they provide thermal insulation to block heat transmission paths, structural support to maintain the sheet configuration, and when combined with protective layers, hermetic sealing to prevent moisture ingress. This integration reduces the need for separate components.
Solution Approach 2:
The heat insulating layers serve multiple purposes: thermal insulation, structural support, and when combined with protective layers, hermetic sealing. This multi-functionality reduces overall device complexity by eliminating the need for separate components for each function.
3Reliability
If the heat conductive sheet is hermetically sealed to prevent moisture ingress, then reliability is improved, but manufacturing complexity increases
Solution Approach 1:
The patent uses flexible protective layers made of thin film materials that conform to the graphite sheet and heat insulating layers. These thin films provide hermetic sealing to prevent moisture ingress while maintaining flexibility for manufacturing processes such as lamination and bonding.
Solution Approach 2:
The patent implements a nested structure where the protective layers completely enclose the graphite heat dissipating sheet and heat insulating layers, creating a hermetically sealed sandwich structure. This nested configuration ensures protection against moisture while maintaining a compact form factor suitable for integration into electronic devices.
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
The proposed heat conductive sheet effectively dissipates heat from heat-generating components, reducing adverse effects on nearby components, preventing heat transmission, and minimizing the risk of short circuits by hermetically sealing the graphite sheet, thus ensuring efficient and reliable operation of electronic apparatuses.
Implementation Method 1
a heat conductive sheet for transmitting the heat generated from the heat generating component
Implementation Method 2
a first heat insulating layer provided above the heat dissipating sheet
Data Source
AI summary
A heat conductive sheet includes a heat dissipating sheet, a first heat insulating layer provided above the heat dissipating sheet, a first sheet provided above the first heat insulating layer, and a second sheet provided below the heat dissipating sheet. The first sheet includes a first protruding portion protruding from the heat dissipating sheet viewing from above. The second sheet includes a second protruding portion protruding from the heat dissipating sheet viewing from above. A thermal conductivity of the first heat insulating layer is lower than any of a thermal conductivity of the first sheet, a thermal conductivity of the second sheet, and a thermal conductivity of the heat dissipating sheet. The first protruding portion overlaps and the second protruding portion viewing from above.