Electric Vehicle Lubricant Boron Nitrogen Balance
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Solution Overview
Problem
Existing lubricating compositions for electric and hybrid vehicles struggle to balance lubrication and cooling requirements, as these properties impose opposite constraints, and they often fail to provide adequate electrical resistivity and durability.
Innovation Solution
A lubricating composition comprising at least one base oil and specific additives such as antiwear, extreme pressure, antioxidants, anti-corrosion, metal deactivator, anti-foam agents, and dispersants, with carefully controlled boron and nitrogen concentrations, is developed to enhance durability and electrical resistivity while meeting lubrication and cooling needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the lubricant is made more conductive to improve cooling efficiency, then heat dissipation improves, but electrical current leakage risk increases
Solution Approach 1:
The patent changes the electrical conductivity parameter of the lubricant by controlling the concentration of conductive additives (metal particles, carbon nanotubes, or graphite) within specific ranges (0.01-5% by weight). This optimization allows the lubricant to achieve sufficient thermal conductivity for effective cooling while maintaining electrical resistivity above 10^9 ohm.cm to prevent current leakage in electric motor environments.
2Force
If friction modifier additives are increased to improve lubrication, then friction reduction improves, but electrical resistivity decreases
Solution Approach 1:
The patent uses composite lubricant formulations combining multiple additive types in specific proportions: friction modifiers (0.1-5% by weight) for lubrication, electrical resistivity additives (0.01-5% by weight) such as metal particles or carbon nanotubes to maintain electrical insulation, and wear protection additives (0.1-5% by weight). This composite approach balances friction reduction with electrical resistivity maintenance.
3Temperature
If cooling efficiency is enhanced by increasing lubricant flow, then heat dissipation improves, but lubrication film stability deteriorates
Solution Approach 1:
The patent optimizes the viscosity parameter of the lubricant by selecting base oils with appropriate viscosity grades and adding viscosity modifiers (0.1-5% by weight) to maintain stable viscosity across temperature ranges. This allows the lubricant to flow efficiently for cooling while maintaining sufficient viscosity to form stable lubrication films under varying operating conditions.
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 composition achieves improved resistivity and durability, maintaining high electrical resistivity over time, and effectively lubricates and cools propulsion systems in electric and hybrid vehicles, thereby extending the service life and efficiency of these systems.
Implementation Method 1
lubricating compositions, also known as 'lubricants', for the main purpose of reducing the friction forces between the different parts of the vehicle propulsion system, in particular between moving metal parts in motors
Implementation Method 2
Electric motors generate heat during operation. If the amount of heat generated is greater than the amount of heat normally dissipated into the environment, the engine requires cooling
Implementation Method 3
the lubricating fluid of the transmission part will be further used for cooling the hot parts of the electric motor
Data Source
AI summary
The present invention relates to a lubricating composition comprising at least one base oil and at least one additive chosen from anti-wear additives, extreme pressure additives, antioxidants, anti-corrosion additives, metal deactivator additives, anti-foam agents, dispersants and mixtures thereof,said composition having a boron concentration less than or equal to 100 ppm by weight and a nitrogen concentration strictly greater than 100 ppm by weight and less than or equal to 500 ppm by weight, with respect to the total weight of the lubricating composition.