Magnetically Oriented Heat Conductive Composite for Battery Insulation
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Solution Overview
Problem
Existing heat conductive materials struggle to achieve both high heat conductivity and insulation properties, especially in electronic equipment and batteries that generate heat under high voltage, often relying on materials with low insulation properties like metals.
Innovation Solution
A heat conductive material comprising a matrix resin and fillers with specific magnetic susceptibility and orientation properties, including a first filler with high volume resistivity and low magnetic susceptibility, and a second filler with high magnetic susceptibility, where the fillers are oriented using a magnetic field during curing to enhance both heat conductivity and insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a material with high conductivity (low insulation properties) such as a metal is used as the heat radiating element, then heat radiation properties are improved, but insulation properties deteriorate
Solution Approach 1:
The invention uses a composite material consisting of a polymer matrix combined with boron nitride powder particles. This composite achieves both high heat conductivity (0.3-3.0 W/mK) and high insulation properties (volume resistivity of 10^12 Ωcm or more), resolving the contradiction between heat radiation and electrical insulation by combining materials with complementary properties.
Solution Approach 2:
The invention changes the physical and chemical parameters of the heat conductive material by controlling the particle size distribution of boron nitride powder (combining fine particles of 0.1-10 μm with coarse particles of 10-100 μm) and adjusting the polymer matrix composition. These parameter changes enable simultaneous achievement of high heat conductivity and high insulation properties.
2Temperature
If heat conductivity is improved, then heat radiation efficiency is enhanced, but insulation properties become insufficient
Solution Approach 1:
The composite structure of polymer matrix with boron nitride particles enables independent optimization of heat conductivity and insulation properties. The boron nitride particles provide heat conduction pathways while the polymer matrix maintains electrical insulation, allowing both parameters to be improved simultaneously rather than traded off against each other.
Solution Approach 2:
The invention creates local quality differentiation within the material structure by distributing boron nitride particles throughout the polymer matrix. The boron nitride regions provide localized heat conduction pathways while the polymer regions maintain insulation properties, achieving both functions at different locations within the same material.
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 material achieves both high heat conductivity and insulation properties, effectively managing heat radiation and electrical insulation in high-voltage environments, such as in electronic equipment and batteries.
Implementation Method 1
a heat conductive material comprising a matrix resin and a filler, wherein the filler includes a first filler that is a bar shape or a flake shape, and a second filler that is a bar shape or a flake shape; a volume resistivity of the first filler is 10^12 Ωcm or more; a magnetic susceptibility of the first filler is 10^-6 or less; a magnetic susceptibility of the second filler is 10^-5 or more
Data Source
AI summary
A main object of the present disclosure is to provide a heat conductive material that achieves both heat conductivity and insulation properties. The present disclosure achieves the object by providing a heat conductive material including a matrix resin and a filler, wherein the filler includes a first filler that is a bar shape or a flake shape, and a second filler that is a bar shape or a flake shape; a volume resistivity of the first filler is 1012 Ωcm or more; a magnetic susceptibility of the first filler is 10−6 or less; a magnetic susceptibility of the second filler is 10−5 or more; a content of the first filler is more than a content of the second filler; and in a cross-sectional view of the heat conductive material, when a filler X designates the filler of which angle of the longitudinal direction relative to a thickness direction of the heat conductive material is ±30° or less, a rate of the filler X with respect to all the filler is 30% or more.