Paraffin Wax Composite for Battery Thermal Management
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Solution Overview
Problem
The inefficiency in converting thermal energy into kinetic energy in battery packs due to increased working temperature and reduced energy conversion efficiency, leading to shortened battery life, is exacerbated by the use of multiple batteries connected in series to achieve sufficient voltage.
Innovation Solution
A heat dissipating material comprising paraffin wax, boron nitride, and modified multi-walled carbon nanotubes, with specific weight ratios, that absorbs or releases heat through phase change and enhances thermal conductivity, is developed to manage temperature within battery packs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If several batteries are connected in series to form a battery pack to achieve sufficient voltage, then the voltage requirement is met, but the working temperature increases and energy conversion efficiency decreases
Solution Approach 1:
The patent uses a composite heat dissipating material comprising paraffin wax as the base matrix, boron nitride particles as thermal conductivity enhancers, and modified multi-walled carbon nanotubes as high-performance thermal pathways. This composite structure achieves superior thermal conductivity while maintaining the phase change heat absorption capability of paraffin wax, effectively resolving the temperature increase issue in battery packs
Solution Approach 2:
The patent utilizes the phase change properties of paraffin wax, which absorbs heat during melting and releases heat during solidification. This phase transition mechanism provides passive thermal management in battery packs, absorbing excess heat during discharge operations and maintaining stable working temperatures without requiring active cooling systems
2Power
If several batteries are connected in series to form a battery pack, then the voltage requirement is met, but the battery life is shortened
Solution Approach 1:
The patent converts the harmful thermal energy that would otherwise degrade battery components into a useful resource by using phase change material to absorb and store this heat. The heat that would cause temperature rise and accelerate aging is instead captured during the phase change process, protecting the battery from thermal damage and extending its operational life
Solution Approach 2:
The patent changes the thermal parameters of the battery pack environment by introducing a material with high thermal conductivity and phase change capabilities. This alters the heat transfer dynamics within the battery pack, maintaining more stable temperature conditions that prevent thermal degradation and extend battery lifespan
3Temperature
If paraffin wax is used as heat dissipating material, then heat absorption through phase change is achieved, but thermal conductivity is insufficient
Solution Approach 1:
The patent creates a composite material system where boron nitride particles and modified multi-walled carbon nanotubes are dispersed within the paraffin wax matrix. This combination leverages the phase change heat absorption capability of paraffin wax while the inorganic fillers provide high thermal conductivity pathways, achieving both heat storage and efficient heat transfer functions simultaneously
Solution Approach 2:
The modified multi-walled carbon nanotubes act as intermediary thermal conduits between the paraffin wax regions and the battery components. These nanotubes create efficient thermal pathways that bridge the low-conductivity paraffin wax and the heat-generating battery elements, enhancing overall heat dissipation performance
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 heat dissipating material effectively reduces the working temperature of battery packs during discharge, improving energy conversion efficiency and extending battery life by enhancing thermal conductivity and managing temperature fluctuations.
Implementation Method 1
the paraffin wax absorbs or releases heat through phase change
Implementation Method 2
the boron nitride and the graphite increase the thermal conductivity of the heat dissipating material
Data Source
AI summary
A heat dissipating material and a method for preparing the same, of which the method comprises the following steps: providing paraffin wax, boron nitride, graphite, and a modified multi-walled carbon nanotube; heating the paraffin wax until the paraffin wax is softened; and mixing the boron nitride, the graphite, the modified multi-walled carbon nanotube and the paraffin wax. Wherein, based on the total weight of the heat dissipating material, the content of the paraffin wax is from 50 to 60% by weight; the content of boron nitride is from 20 to 40% by weight; the content of the graphite is from 3 to 15% by weight; and the content of the modified multi-walled carbon nanotube is from 1 to 5% by weight.