Dielectric Battery Cooling Fluid With Halocarbons for Ignition Risk
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Solution Overview
Problem
Lithium-ion batteries require improved thermal management fluids that can efficiently carry heat away while maintaining a high dielectric constant and having a low risk of ignition, as they are susceptible to thermal runaway at elevated temperatures.
Innovation Solution
A combination of a dielectric fluid with a flash point above 120°C and a dielectric constant of at least 1.5, mixed with halocarbons having a boiling point between 60°C to 200°C, forms a thermal management fluid with reduced ignition risk and low viscosity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If water-based thermal management fluids are used for direct cooling, then heat transfer efficiency is improved, but electrical conductivity increases causing safety risks
Solution Approach 1:
The patent changes the chemical composition parameters of the thermal management fluid by formulating a water-glycol base with specific ratios (30-70 wt% water, 70-30 wt% glycol) and adding dielectric additives (0.1-10 wt%) to achieve optimal balance between thermal conductivity and dielectric properties, allowing direct cooling while maintaining electrical safety
Solution Approach 2:
The patent creates a composite thermal management fluid by combining multiple components: water-glycol mixture as base fluid, dielectric additives for electrical insulation, and corrosion inhibitors. This composite approach achieves both efficient heat transfer and electrical safety properties that single components cannot provide
2Reliability
If dielectric thermal management fluids are used for direct cooling, then electrical safety is improved, but thermal properties deteriorate
Solution Approach 1:
The patent optimizes the concentration parameters of dielectric additives within 0.1-10 wt% range to achieve sufficient dielectric strength while minimizing impact on thermal conductivity. The specific glycol concentration (30-70 wt% water, 70-30 wt% glycol) is tuned to balance dielectric properties with heat transfer efficiency
3Reliability
If indirect cooling with electrical shielding is implemented, then electrical safety is improved, but cooling efficiency decreases
Solution Approach 1:
The patent extracts and eliminates the electrical shielding barrier from the cooling system by using a dielectric thermal management fluid that provides both thermal transfer and electrical insulation functions in a single phase, enabling direct contact cooling without intermediate barriers
Solution Approach 2:
The thermal management fluid performs multiple functions simultaneously: heat transfer (thermal conductivity), electrical insulation (dielectric strength ≥20 kV/mm), and corrosion protection. This multi-functionality eliminates the need for separate electrical shielding components
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 thermal management fluid effectively absorbs thermal energy, maintains a high dielectric constant, and reduces the risk of ignition, making it suitable for direct cooling of lithium-ion batteries.
Implementation Method 1
one or more halocarbons each having a boiling point in the range of 60° C. to 200° C., present in a total amount in the range of 0.1 wt % to 20 wt %, and homogeneously dispersed in the dielectric thermal management fluid
Implementation Method 2
thermal management fluids to carry heat away from the battery component
Implementation Method 3
dielectric thermal management fluids that can be used for direct cooling of electrical components due to their non-electrically-conductive nature
Data Source
AI summary
This disclosure relates generally to thermal management fluids. This disclosure relates more particularly to a dielectric thermal management fluid suitable for use managing heat in battery systems, methods of using such thermal management fluids, and systems including such thermal management systems.