Perfluoropolyether-Alkoxy-Perfluoroalkane Mixture for Battery Cooling
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Solution Overview
Problem
Current heat transfer liquids for batteries and electrical components in electric vehicles face inefficiencies in cooling and longevity due to low heat capacity, high viscosity, and hygroscopicity, as well as the need for separate conduits which decrease cooling efficiency.
Innovation Solution
A liquid heat transfer mixture comprising a mixture of liquid perfluoropolyether and liquid alkoxy-perfluoroalkane, with a volume ratio of 20:80 to 80:20, providing improved electrical insulation, low evaporation, high boiling point, and increased heat capacity, allowing direct contact with electrical components for efficient cooling and heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dielectric oil is used for cooling batteries, then electrical insulation is provided, but heat capacity is low and cooling efficiency is limited
Solution Approach 1:
The patent uses a composite heat transfer fluid comprising perfluoropolyether and alkoxy-perfluoroalkane components. This composite formulation combines the electrical insulation properties of perfluorinated compounds with enhanced heat capacity, resolving the contradiction between insulation reliability and heat transfer quantity.
2Productivity
If liquid coolant in conduit is used, then cooling efficiency is improved, but separate conduit is required which decreases heat flow
Solution Approach 1:
The patent merges the coolant function with direct contact with battery cells by using a battery cooling system where the heat transfer fluid directly contacts the battery cells through cooling plates, eliminating the need for separate conduits and maximizing heat flow while maintaining high cooling efficiency.
3Reliability
If perfluoropolyether is used, then electrical insulation and high boiling point are achieved, but viscosity is high and heat capacity is low
Solution Approach 1:
The patent changes the physical and chemical parameters of the heat transfer fluid by formulating a mixture of perfluoropolyether and alkoxy-perfluoroalkane in specific ratios. This parameter optimization reduces viscosity while maintaining electrical insulation properties and enhances heat capacity through the synergistic combination of components.
4Quantity of substance
If alkoxy-perfluoroalkane is used, then heat capacity is increased, but electrical insulation properties deteriorate and hygroscopicity increases
Solution Approach 1:
The patent formulates a composite heat transfer fluid where perfluoropolyether and alkoxy-perfluoroalkane are combined in specific proportions. The perfluoropolyether component provides electrical insulation and high boiling point, while the alkoxy-perfluoroalkane contributes enhanced heat capacity, creating a synergistic mixture that balances all required properties.
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 mixture offers enhanced electrical insulation, reduced evaporation, and improved heat transfer capabilities, extending the usable life to two to three years while maintaining high cooling efficiency, outperforming individual components in terms of heat capacity and longevity.
Implementation Method 1
a liquid heat transfer mixture comprising a mixture of a liquid perfluoropolyether and a liquid alkoxy-perfluoroalkane... for cooling or heating batteries and other electrical components
Implementation Method 2
passing a coolant fluid through a conduit arranged in the battery along the battery cells
Implementation Method 3
cooling the batteries during charging, prior to use, and during discharging as the electric vehicle is used
Implementation Method 4
providing improved electrical insulation... outperforming individual components in terms of heat capacity and longevity
Data Source
AI summary
A liquid heat transfer mixture comprises a mixture of a liquid perfluoropolyether and a liquid alkoxy-perfluoroalkane, wherein the volume ratio of the liquid perfluoropolyether to the liquid alkoxy-perfluoroalkane is from 20:80 to 80:20. Use of the liquid heat transfer mixture is also disclosed.