Dielectric Battery Cooling Fluid Balancing Flash Point and Heat Transfer
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Solution Overview
Problem
Current dielectric thermal management fluids for lithium-ion batteries have poor thermal properties and are prone to ignition, limiting their effectiveness in direct cooling applications, especially in electric vehicles where high heat management is crucial.
Innovation Solution
Development of thermal management fluids with a flash point of at least 100°C and a dielectric constant of 1.5 at 25°C, composed of specific dielectric compounds that offer high heat conductivity, low viscosity, and a reduced risk of ignition, enabling efficient heat transfer and safe operation in high-temperature environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If dielectric thermal management fluids with high flash point are used, then ignition risk is reduced, but thermal conductivity and heat transfer efficiency deteriorate
Solution Approach 1:
The patent optimizes the molecular structure and composition parameters of dielectric compounds to achieve flash point ≥100°C while maintaining thermal conductivity ≥0.05 W/m·K through careful selection of fluorinated chains and ester groups that balance electrical insulation, thermal transport, and combustion resistance
2Reliability
If water-based cooling fluids are used for direct cooling, then thermal conductivity is high, but electrical conductivity causes safety issues
Solution Approach 1:
The patent introduces fluorinated dielectric compounds as intermediary substances that replace water in direct contact with electrical components, providing comparable thermal conductivity while maintaining electrical insulation properties, thus mediating between heat transfer requirements and electrical safety constraints
3Reliability
If conventional thermal management fluids are used, then cooling performance is adequate, but viscosity is high increasing pumping power requirements
Solution Approach 1:
The patent modifies the viscosity parameter of dielectric thermal management fluids by selecting compounds with lower molecular weight and optimized chain structures, achieving viscosity ≤10 cSt at 40°C while maintaining adequate thermal conductivity and dielectric properties, thereby reducing pumping power requirements
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 thermal management fluids effectively absorb and dissipate heat from lithium-ion batteries, reducing the risk of thermal runaway and extending battery lifespan while ensuring safety by preventing ignition, thus enhancing the performance and reliability of electric vehicles.
Implementation Method 1
The thermal management fluids effectively absorb and dissipate heat from lithium-ion batteries
Implementation Method 2
dielectric thermal management fluid suitable for use managing heat in battery systems through direct cooling
Data Source
AI summary
This disclosure relates generally to thermal management fluids. More particularly, this disclosure relates to a dielectric thermal management fluid suitable for use managing heat in battery systems through direct cooling, such as lithium-ion batteries used in electric vehicles, electric motors, and power electronics, methods of using such thermal management fluids, and systems including such thermal management systems.