Graphene-Infused Polymer Enclosure for Vehicle EMI Shielding and Heat Sinking
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Solution Overview
Problem
Existing vehicle enclosures for electronic assemblies face challenges in providing lightweight solutions that offer effective electromagnetic interference (EMI) shielding, heat dissipation, and moisture protection without compromising weight or integrity.
Innovation Solution
A plastic enclosure fabricated using a polymer base material infused with graphene and carbon nanostructures, which provides both thermal and electrical conductivity, combined with a waterproof sheathing material, offers EMI shielding and heat sinking capabilities while maintaining structural integrity and reducing weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal enclosures are used to provide EMI shielding and heat dissipation, then EMI shielding effectiveness and heat dissipation capability are improved, but vehicle weight increases
Solution Approach 1:
The patent applies composite materials by integrating conductive polymer matrices with carbon nanotube and graphene reinforcements. This creates a lightweight composite enclosure that provides both EMI shielding and heat dissipation capabilities while significantly reducing weight compared to traditional metal enclosures. The composite structure combines the advantages of polymer materials (low density, corrosion resistance) with the conductive properties of carbon-based nanomaterials.
Solution Approach 2:
The patent changes the material parameters by modifying the polymer base material's electrical and thermal conductivity through the addition of carbon nanotubes and graphene. By controlling the concentration and distribution of these conductive fillers, the enclosure achieves optimal EMI shielding effectiveness and heat dissipation performance while maintaining lightweight characteristics.
2Temperature
If metal enclosures are used to provide EMI shielding and heat sinking, then heat dissipation capability is improved, but vehicle weight increases
Solution Approach 1:
The conductive polymer composite combines low-density polymer matrices with high-aspect-ratio carbon nanotubes and two-dimensional graphene sheets. This composite structure provides efficient thermal conduction pathways while maintaining low overall density, enabling effective heat dissipation without the weight penalty of metal enclosures.
Solution Approach 2:
The patent replaces the traditional metal-based thermal management system with a polymer composite system. The carbon nanotube and graphene networks within the polymer matrix create efficient phonon transport pathways, substituting the metallic thermal conduction mechanism with a nanocomposite-based mechanism that offers superior weight-to-heat-dissipation ratio.
3Weight of moving object
If non-metallic materials are used for enclosures to reduce weight, then vehicle weight is reduced, but EMI shielding capability deteriorates
Solution Approach 1:
The patent transforms a non-conductive polymer material into an EMI-shielding composite by incorporating conductive carbon nanotubes and graphene. The percolating network of these nanomaterials within the polymer matrix provides continuous conductive pathways that effectively shield against electromagnetic interference, enabling the enclosure to achieve metal-level EMI protection with fraction of the weight.
Solution Approach 2:
The patent fundamentally changes the electrical conductivity parameter of the polymer enclosure material by adding carbon-based nanofillers. This parameter transformation converts the material from an electrical insulator to a conductive composite, enabling EMI shielding functionality while retaining the inherent advantages of polymer materials such as low weight and corrosion resistance.
4Weight of moving object
If non-metallic materials are used for enclosures to reduce weight, then vehicle weight is reduced, but heat dissipation capability deteriorates
Solution Approach 1:
The conductive polymer composite uses the high thermal conductivity of carbon nanotubes and graphene to establish efficient heat transfer pathways within the low-density polymer matrix. This composite architecture enables effective heat dissipation from electronic components while maintaining the lightweight advantage of non-metallic materials.
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 solution effectively shields against EMI, dissipates heat, and protects from moisture, achieving a lightweight yet robust enclosure suitable for harsh environments like vehicle engine compartments, while minimizing weight and maintaining performance.
Implementation Method 1
The graphene nanostructures provide a thermal conductivity characteristic to the base material... Heat generated by the electronic assembly is conducted out of the enclosure by the standoff elements, due to the graphene nanostructures contained therein
Implementation Method 2
The carbon nanostructures in the housing portion and the lid provide EMI shielding to the electronic assembly inside the enclosure
Data Source
AI summary
Example embodiments described in this disclosure are generally directed to a plastic enclosure that provides EMI shielding and heat sinking to an electronic assembly. In one embodiment, the enclosure includes a housing portion formed of a base material that includes a polymer containing graphene nanostructures and carbon nanostructures. The graphene nanostructures provide a thermal conductivity characteristic to the base material. A set of standoff elements made of the base material is provided inside the housing for mounting the electronic assembly. Heat generated by the electronic assembly is conducted out of the enclosure by the standoff elements due to the graphene nanostructures. The carbon nanostructures provide an electrical conductivity characteristic to the base material. A lid formed of the base material may be attached to the housing portion. The carbon nanostructures in the housing portion and the lid provide EMI shielding to the electronic assembly inside the enclosure.