Diester EV Cooling Fluid for High-Heat Propulsion Lubrication
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Solution Overview
Problem
Conventional cooling and lubrication methods for electric and hybrid vehicle propulsion systems, including electric motors and batteries, are inadequate for managing the high heat generated by these components, especially during quick charging, and there is a need for improved compositions that can effectively cool and lubricate these systems.
Innovation Solution
A composition comprising diesters formed between a diol with 3 to 12 carbon atoms and two monocarboxylic acids with 4 to 10 carbon atoms is used for cooling and lubricating the propulsion system, including the motor reduction gear, batteries, and power electronic components, with optional additives for enhanced performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional cooling methods (air or water with glycol) are used, then cooling is provided for electric motors, but the methods are no longer sufficient for increasingly smaller engines with increasingly higher power and cannot extract heat generated by batteries during quick charging
Solution Approach 1:
The patent changes the chemical composition parameters of the cooling fluid by using diesters with specific carbon chain lengths (4-10 carbons in monocarboxylic acids, 3-12 carbons in diols) instead of conventional glycol-based fluids. This chemical parameter change enables superior heat extraction capability for high power density motors and batteries during quick charging operations.
Solution Approach 2:
The patent employs composite lubricating compositions containing diesters combined with other base oils and additives to create a multi-functional fluid that simultaneously provides cooling, lubrication, and heat extraction. This composite approach allows the fluid to handle the thermal loads of modern high-power electric motors and batteries effectively.
2Adaptability or versatility
If lubricating compositions are used to perform double function of lubrication and cooling, then lubrication performance is improved, but the compositions must be compatible with multiple components (motor reduction gear, battery, power electronic components)
Solution Approach 1:
The patent designs a universal lubricating composition based on diesters that can simultaneously lubricate the motor reduction gear and cool the battery and power electronic components. The diester base provides both lubrication film formation and thermal management properties, eliminating the need for separate fluids for different components.
Solution Approach 2:
The patent adjusts the chemical parameters of the lubricating composition by selecting diesters with specific molecular structures (monocarboxylic acids with 4-10 carbons, diols with 3-12 carbons) to achieve optimal balance between lubrication performance and thermal stability across multiple components including gears, batteries, and power electronics.
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 diester-based composition effectively cools and lubricates the propulsion system, managing heat and reducing the risk of dangerous temperatures, while maintaining compatibility with the system's components and improving lubrication efficiency.
Implementation Method 1
The diester-based composition effectively cools and lubricates the propulsion system, managing heat and reducing the risk of dangerous temperatures
Implementation Method 2
The diester-based composition effectively cools and lubricates the propulsion system, managing heat and reducing the risk of dangerous temperatures
Data Source
AI summary
Use of a diester in a composition for cooling and/or lubrication of an electric or hybrid vehicleThe present invention relates to the use, for cooling and/or lubricating a propulsion system of an electric or hybrid vehicle, of a composition comprising one or a plurality of diesters, each of said diesters being formed between a diol containing from 3 to 12 carbon atoms and two monocarboxylic acids, identical or different, including a linear or branched hydrocarbon chain having from 4 to 10 carbon atoms.