Ester Blend Cooling Fluids With Low Conductivity and Thermal Stability
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Solution Overview
Problem
There is a need for improved base oil compositions and cooling fluid compositions that exhibit low viscosity, high thermal stability, and low electrical conductivity, particularly for use in electric vehicles to prevent charge build-up and enhance battery thermal management.
Innovation Solution
A blend of alkenylene diester and a compound of Formula I, or a blend of dialkyl fumarate and alkyl ricinoleate, is used to create an oil composition suitable for electric drive and cooling applications, which includes a process of combining these components and mixing for at least 5 minutes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If heavy hydrofluoroether products are used for cooling, then thermal stability is improved, but weight increases and density exceeds 1.5 g/cm³
Solution Approach 1:
The patent changes the chemical composition parameters by using esters with specific molecular structures (Formula I with controlled alkyl groups and chain lengths) to achieve lower density while maintaining thermal stability. The ester composition is designed to have density below 1.0 g/cm³ while preserving high-temperature performance characteristics.
Solution Approach 2:
The patent creates a composite cooling fluid by blending ester base oils with specific additives and modifiers. This composite approach combines the low density of esters with thermal stability properties, achieving a balanced formulation that neither pure hydrofluoroether nor simple esters could provide alone.
2Productivity
If oil composition is designed for low viscosity to increase system efficiency, then system efficiency is improved, but thermal stability and electrical conductivity control become more difficult
Solution Approach 1:
The patent optimizes the viscosity parameters of the ester composition by adjusting molecular weight distribution and chain structure. The ester blend achieves low viscosity at operating temperatures to improve system efficiency while maintaining appropriate viscosity at other temperatures to ensure thermal stability and proper lubrication characteristics.
Data Source
AI summary
This disclosure relates to oil compositions of ester blends that are useful in the chemical arts, such as in the manufacture of products, such as base oils and battery immersive cooling fluids. In particular, the present disclosure pertains to blends of an alkenylene diester, such as a dialkyl fumarate or a dialkyl maleate, and a compound of Formula I.