Isomeric Branched Paraffin Heat Transfer Fluids for EV Battery Cooling
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Solution Overview
Problem
Current heat transfer fluids used in electric vehicles are unsuitable for direct immersion in batteries and electric motors due to electrical conductivity, leading to potential shorting and failure, and existing fluids have limitations in heat dissipation and environmental safety.
Innovation Solution
Development of heat transfer fluids comprising isomeric branched paraffins formed from hydrogenated linear alpha olefins oligomerized with a BF3 catalyst system, which have high thermal conductivity, elevated flash points, and low electrical conductivity, suitable for direct contact with batteries and electric motors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If aqueous heat transfer fluids are used for direct immersion cooling, then heat transfer efficiency is improved, but electrical conductivity causes shorting and component failure
Solution Approach 1:
The patent changes the fundamental parameter of electrical conductivity by replacing aqueous-based fluids with hydrocarbon-based fluids (isomeric branched paraffins). This parameter change maintains the liquid state and heat transfer capabilities while eliminating electrical conductivity, allowing direct immersion cooling without shorting risks.
Solution Approach 2:
The patent uses composite molecular structures - specifically isomeric branched paraffins with 16-24 carbon atoms - that combine the desirable properties of hydrocarbons (electrical insulation, thermal stability) with adequate heat transfer characteristics, creating a material that satisfies multiple conflicting requirements simultaneously.
2Reliability
If fluorocarbon fluids are used for heat transfer, then flash point requirements are met, but health and environmental effects worsen due to burning fumes
Solution Approach 1:
The patent converts the traditionally harmful hydrocarbon class into a beneficial heat transfer fluid by selecting specific isomeric branched paraffins that possess both the electrical insulation properties needed for safety and acceptable flash points through their molecular structure, while avoiding the toxic fume generation associated with fluorocarbons.
Solution Approach 2:
The patent changes the chemical composition parameter from fluorocarbon to hydrocarbon basis, fundamentally altering the combustion byproducts from toxic fluorinated compounds to relatively benign hydrocarbon combustion products, thereby improving health and environmental safety while maintaining fire safety through appropriate molecular weight selection.
3Temperature
If heat-dissipating fins are used for cooling, then heat dissipation capability is improved, but vehicle weight increases lowering efficiency
Solution Approach 1:
The patent employs a hydraulic cooling system using liquid heat transfer fluid (isomeric branched paraffins) that circulates through compact channels and heat exchangers, replacing the need for large thermal mass components like heat-dissipating fins. The fluid's high specific heat capacity and thermal conductivity enable efficient heat removal in a lightweight, compact configuration.
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 new heat transfer fluids provide effective thermal management, preventing overheating and electrical conductivity issues, ensuring safe and efficient cooling of electric vehicle components while meeting environmental and health standards.
Implementation Method 1
Since fluids may exhibit higher thermal conductivity and heat capacity values than air, fluids may promote more effective heat dissipation from a battery or other heat-generating component
Implementation Method 2
a suitable heat transfer fluid may be jacketed around and/or circulated through a heat-generating component
Implementation Method 3
one or more linear alpha olefins (LAOs) oligomerized with a BF3 catalyst system
Implementation Method 4
The one or more LAOs have about 8 to about 12 carbon atoms. The plurality of isomeric branched paraffins comprising at least about 90 wt. % isomeric branched paraffin dimers
Implementation Method 5
isomeric branched paraffins comprising a hydrogenated reaction product of one or more linear alpha olefins
Data Source
AI summary
Branched paraffins formed as a hydrogenated reaction product of one or more linear alpha olefins (LAOs) oligomerized with a BF3 catalyst system and comprising at least about 90 wt. % branched paraffin dimers may have advantageous heat transfer properties. Heat transfer fluids comprising the branched paraffins may be placed in contact with a heat- generating component, such as those found in electric vehicles, battery systems, and other locations in need of thermal management. Branched paraffin dimers formed from one or more LAOs having about 8 to about 12 carbon atoms may collectively have a Mouromtseff Number ranging from about 10,000 to about 16,000 kg/(s2.2.m0.6.K) at 80° C., a thermal conductivity at 80° C. of about 0.125 W/m.K or higher, and a flash point of about 140° C. or higher.