Non-water Coolant Composition for EV Thermal Management
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Solution Overview
Problem
Existing coolants for vehicle travel motors, such as hybrid and electric vehicles, face challenges in achieving excellent insulation properties, cooling capability, and flame resistance simultaneously, with aqueous coolants like ethylene glycol offering good cooling but poor insulation, and non-aqueous coolants like mineral oil excelling in insulation but lacking in flame resistance.
Innovation Solution
A non-water coolant composition comprising a halogen-based flame retardant, such as fluorine-based oil or chlorinated paraffin, combined with a base oil like mineral or synthetic oil, providing excellent insulation, cooling capability, and flame resistance, with a halogen-based flame retardant content of 1-80% and base oil content of 20-99%, and a conductivity of 0.1 µS/cm or less at 20°C.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If aqueous coolant (ethylene glycol mixture) is used, then cooling capability is improved, but insulation property deteriorates due to high conductivity
Solution Approach 1:
The patent changes the fundamental parameter of coolant composition from aqueous-based to non-aqueous-based (ester oil with specific additives), which fundamentally alters the electrical conductivity from high to low levels, thereby improving insulation property while maintaining cooling capability through optimized chemical composition
Solution Approach 2:
The patent creates a composite coolant system by combining ester base oil with specific additives including viscosity modifiers and corrosion inhibitors, forming a multi-component composition that achieves both excellent insulation properties and effective cooling performance simultaneously
2Reliability
If non-aqueous coolant (mineral oil) is used, then insulation property is improved, but flame resistance deteriorates
Solution Approach 1:
The patent modifies the chemical composition parameters by selecting ester oils with specific molecular structures and incorporating flame-retardant additives, changing the flash point and combustion characteristics to achieve high flame resistance while preserving the low conductivity and insulation properties of non-aqueous formulations
3Reliability
If insulating plates are used between power card and cooler, then insulation property is improved, but cooling capability deteriorates due to thermal resistance
Solution Approach 1:
The patent extracts and eliminates the insulating plate component from the cooling system by using a non-aqueous coolant with inherently low conductivity that provides both insulation and cooling functions, thereby removing the thermal resistance barrier while maintaining electrical insulation through the coolant's intrinsic 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 non-water coolant composition effectively suppresses short circuits, maintains excellent insulation over time, enhances cooling performance by eliminating the need for insulating plates, and provides high flame resistance, making it suitable for direct contact with electronic components in vehicle cooling systems.
Implementation Method 1
a conductivity of 0.1 µS/cm or less at 20°C
Implementation Method 2
high flame resistance
Implementation Method 3
enhances cooling performance
Data Source
Figure 1
AI summary
An object of the present disclosure is to provide a non-aqueous coolant composition having all of excellent insulation property, cooling capability, and flame resistance. This embodiment is a non-water coolant composition that comprises at least one halogen-based flame retardant selected from a fluorine-based oil and a chlorinated paraffin.