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 or higher, composed of specific dielectric compounds that offer low viscosity and high heat conductivity, reducing the risk of ignition and enhancing heat transfer efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional dielectric thermal management fluids are used for direct cooling of lithium-ion batteries, then electrical insulation is provided, but thermal properties are poor and ignition risk increases
Solution Approach 1:
The patent modifies the chemical composition parameters of dielectric fluids by incorporating fluorinated compounds and ester additives to achieve optimal balance between dielectric constant (≥1.5), flash point (≥100°C), viscosity (1-10 cSt), and thermal conductivity (0.05-0.15 W/m·K), resolving the contradiction between electrical insulation and heat transfer efficiency
Solution Approach 2:
The patent creates composite dielectric thermal management fluids by combining multiple components including fluorinated hydrocarbons, esters, and additives in specific ratios, achieving synergistic effects that simultaneously provide electrical insulation, enhanced thermal conductivity, and improved safety margins
2Object-affected harmful factors
If dielectric thermal management fluids with high flash point are used, then safety is improved, but thermal conductivity and heat transfer efficiency deteriorate
Solution Approach 1:
The patent optimizes the flash point parameter to be at least 100°C while simultaneously enhancing thermal conductivity through fluorinated compound incorporation, achieving a breakthrough that resolves the inverse relationship between safety and heat transfer efficiency in dielectric fluids
3Ease of operation
If dielectric thermal management fluids with low viscosity are used, then pumping efficiency is improved, but heat capacity and thermal energy storage deteriorate
Solution Approach 1:
The patent carefully adjusts viscosity parameters to the range of 1-10 cSt at operating temperature to minimize pumping power requirements while incorporating high heat capacity additives and optimizing fluid composition to maintain thermal energy storage capacity, resolving the trade-off between pumping efficiency and thermal energy storage
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 manage heat in lithium-ion batteries by providing a high flash point for safety, low viscosity for efficient pumping, and high dielectric constant for direct cooling, addressing the limitations of existing fluids and improving battery performance and safety.
Implementation Method 1
absorbing thermal energy in the thermal management fluid from the heat source
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.