Dielectric Cooling Fluid Composition for Direct Li-Ion Battery Heat Control
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Solution Overview
Problem
Lithium-ion batteries require effective thermal management due to their susceptibility to temperature variations, with direct cooling methods limited by the use of water-based fluids and indirect cooling being inefficient, necessitating an improved system for efficient heat dissipation in electric vehicles.
Innovation Solution
A thermal management system utilizing a dielectric fluid with halocarbons dispersed within, allowing for direct cooling while maintaining a high dielectric constant and flash point, combined with a phase change material emulsion for enhanced heat absorption and dissipation across multiple thermal circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If water-based cooling fluids are used for direct cooling, then heat dissipation efficiency is improved, but electrical safety deteriorates due to conductivity
Solution Approach 1:
The patent modifies the chemical composition parameters of the cooling fluid by formulating a dielectric fluid with specific properties: dielectric constant of at least 1.5, flash point above the boiling point of halocarbons, and controlled thermal conductivity. This parameter optimization allows the fluid to maintain electrical insulation while achieving effective heat dissipation for battery cooling
Solution Approach 2:
The patent creates a composite thermal management fluid by dispersing halocarbons (0.1-35 wt%) in a dielectric fluid base (65-99.9 wt%). This composite structure combines the electrical insulation properties of dielectric fluids with the heat transfer enhancement provided by halocarbon components, achieving both electrical safety and cooling efficiency
2Object-affected harmful factors
If dielectric coolants are used for direct cooling, then electrical safety is improved, but thermal performance deteriorates due to poor thermal properties
Solution Approach 1:
The patent formulates a composite dielectric fluid containing halocarbons dispersed in a dielectric base fluid. The halocarbon component (0.1-35 wt%) provides enhanced thermal properties while the dielectric base (65-99.9 wt%) maintains electrical insulation. This composite approach overcomes the limitation of poor thermal performance in conventional dielectric coolants
Solution Approach 2:
The patent optimizes the dielectric constant parameter to be at least 1.5 and controls the flash point to be above the boiling point of halocarbons. These parameter adjustments ensure that the fluid maintains sufficient electrical insulation properties while achieving improved thermal performance through the halocarbon enhancement
3Object-affected harmful factors
If indirect cooling with water-based coolants is used, then electrical safety is improved, but cooling efficiency deteriorates due to thermal barrier
Solution Approach 1:
The patent extracts the electrical insulation property from the cooling system design by using dielectric fluids that inherently provide both cooling and electrical protection. This eliminates the need for separate thermal barriers or insulation layers required in indirect cooling systems, allowing direct contact between the cooling fluid and battery components while maintaining electrical safety
Solution Approach 2:
The dielectric cooling fluid performs multiple functions simultaneously: it provides heat dissipation through direct thermal contact, maintains electrical insulation to prevent conductivity issues, and offers fire safety through controlled flash point. This multi-functionality replaces the need for separate cooling and insulation systems required in traditional indirect cooling approaches
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 system provides efficient heat management for lithium-ion batteries by leveraging the dielectric properties and phase change materials to maintain optimal temperatures, preventing thermal runaway and improving battery performance and safety.
Implementation Method 1
one or more halocarbons each having a boiling point in the range of 30° C. to 150° C.
Implementation Method 2
configured such that the first thermal management fluid can absorb heat from the heat source
Implementation Method 3
dissipate heat in the first heat exchanger
Implementation Method 4
each micelle comprises a solid hydrophobic core particle comprising a phase change material having a melting point in the range of 30° C. to 100° C.
Implementation Method 5
absorb heat therefrom
Data Source
AI summary
This disclosure relates generally to thermal management fluid systems. This disclosure relates more particularly to dielectric thermal management fluid systems useful in cooling electronic devices such as lithium-ion batteries, and methods of using such thermal management fluids.