Dielectric Oleaginous Coolant for EV Power System Immersion Cooling
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Solution Overview
Problem
Existing heat transfer fluids used in electrical systems, such as those in electric vehicles, exhibit high electrical conductivity, leading to corrosion and short-circuiting risks, and are prone to freezing, posing safety concerns and inefficiencies in thermal management.
Innovation Solution
Employing a dielectric oleaginous heat transfer fluid, such as isoparaffins or esters, with low electrical conductivity and freeze point, to immerse electrical components, ensuring effective heat dissipation without increasing flammability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If traditional heat transfer fluids (water and glycol) are used, then heat transfer efficiency is improved, but electrical conductivity increases leading to corrosion and short-circuiting risks
Solution Approach 1:
The patent changes the fundamental parameter of electrical conductivity by replacing conventional aqueous heat transfer fluids with dielectric oleaginous fluids. This parameter change transforms the fluid from electrically conductive to electrically insulating, thereby eliminating corrosion and short-circuiting risks while maintaining heat transfer functionality through the dielectric fluid's thermal properties.
Solution Approach 2:
The dielectric oleaginous fluid acts as an intermediary substance that bridges the thermal management needs and electrical safety requirements. It mediates between the power source requiring cooling and the electrical system requiring protection, providing both heat transfer and electrical insulation functions simultaneously.
2Temperature
If conventional heat transfer fluids are used, then cooling performance is achieved, but freeze point issues arise in cold environments
Solution Approach 1:
The patent changes the chemical composition parameter of the heat transfer fluid from water-glycol mixtures to dielectric oleaginous fluids. This parameter change fundamentally alters the freeze point characteristic, enabling the fluid to remain liquid and functional in cold environments where conventional fluids would freeze, thereby improving reliability in varying temperature conditions.
3Productivity
If high conductivity fluids are used for heat transfer, then thermal management efficiency is improved, but corrosion of metal parts increases
Solution Approach 1:
The patent changes the electrical conductivity parameter from high (conventional fluids) to low (dielectric fluids). This parameter change eliminates the electrochemical corrosion mechanism that occurs with conductive fluids, protecting metal components while maintaining effective thermal management through the dielectric fluid's heat transfer capabilities.
4Temperature
If coolant systems with electrical conductivity are used, then heat dissipation is achieved, but electrolysis and boiling occur when coolant contacts electrical terminals
Solution Approach 1:
The patent changes the electrical conductivity parameter to eliminate electrolysis. By using dielectric oleaginous fluids with low electrical conductivity, the fluid cannot undergo electrolysis even when contacting electrical terminals, preventing the harmful boiling and gas generation that occurs with conductive coolants, while maintaining heat dissipation function.
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 dielectric oleaginous fluids provide safe and efficient heat transfer, reducing the risk of electrical hazards and enabling rapid thermal management, allowing for high-speed battery charging and stable operation of electrical components.
Implementation Method 1
a heat transfer fluid that facilitates absorbing and dissipating the heat from the power source
Implementation Method 2
dielectric oleaginous heat transfer fluid with low electrical conductivity
Data Source
AI summary
The disclosed technology relates to a heat transfer system and heat transfer method employing a dielectric oleaginous heat transfer fluid. In particular, the technology relates to a dielectric oleaginous heat transfer fluid with low electrical conductivity, low flammability, and low freeze point that provides excellent peak temperature reduction in a heat transfer system, such as that for cooling a power system of an electric vehicles.