EV Battery Coolant with Low Conductivity and Viscosity
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Solution Overview
Problem
Conventional battery coolants for electric vehicles face issues with high conductivity leading to potential short circuits, high ion elution performance causing radiator material dissolution, and low viscosity at low temperatures increasing water pump load, while non-aqueous materials offer poor cooling performance.
Innovation Solution
A battery coolant composition comprising 90% or more of non-aqueous propylene carbonate or butylene carbonate with 3% or less water and optional glycols and additives like benzotriazole, providing low conductivity, ion elution performance, and viscosity at low temperatures, while maintaining cooling performance equivalent to aqueous coolants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If aqueous coolant composition is used, then cooling performance is improved, but conductivity increases causing potential short circuits
Solution Approach 1:
The patent changes the chemical composition parameters by using non-aqueous base materials (ethylene glycol, propylene glycol) instead of water, and controls the concentration of additives (ionic liquids, salts) to maintain low conductivity while achieving adequate cooling performance through optimized formulation
2Temperature
If aqueous coolant with high ion elution performance is used, then cooling efficiency is improved, but radiator material dissolution occurs
Solution Approach 1:
The patent changes the chemical environment by using non-aqueous base materials that do not promote ion elution, and carefully selects and controls additive concentrations to achieve cooling efficiency without the harmful ion elution effect that occurs with aqueous coolants
Solution Approach 2:
The patent converts the typically harmful effect of high conductivity and ion elution into a benefit by using ionic liquids and salts in controlled concentrations within a non-aqueous base, where they provide necessary electrochemical stability and cooling performance without causing radiator material dissolution
3Reliability
If non-aqueous materials are used, then conductivity is reduced, but cooling performance deteriorates
Solution Approach 1:
The patent creates a composite coolant formulation by combining non-aqueous base materials (ethylene glycol, propylene glycol) with carefully selected and concentrated additives (ionic liquids, salts), achieving a synergistic effect where the composite provides both low conductivity and adequate cooling performance
Solution Approach 2:
The patent optimizes the concentration parameters of additives within the non-aqueous base to achieve the necessary cooling performance while maintaining low conductivity, using precise formulation control to balance these competing requirements
4Use of energy by moving object
If viscosity at very low temperature is reduced, then water pump load decreases, but freezing protection capability is compromised
Solution Approach 1:
The patent changes the physical parameters of the coolant by using non-aqueous base materials with inherently lower viscosity at low temperatures, and optimizes the composition to maintain freezing protection capability while reducing viscosity to minimize water pump load
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 coolant achieves low conductivity, reduced ion elution, and viscosity at low temperatures, preventing short circuits and radiator material dissolution, and minimizing water pump load, while maintaining effective cooling performance.
Implementation Method 1
a battery coolant for an electric vehicle that has a low conductivity, a low ion elution performance, a low viscosity at a very low temperature, and a cooling performance equivalent to that of an aqueous coolant composition in a driving temperature range
Implementation Method 2
a battery coolant for an electric vehicle containing: at least one kind of carbonates selected from the group consisting of propylene carbonate and butylene carbonate
Data Source
AI summary
The present disclosure provides a battery coolant for an electric vehicle that has a low conductivity, a low ion elution performance, a low viscosity at a very low temperature, and a cooling performance equivalent to that of an aqueous coolant composition in a driving temperature range. The present disclosure relates to a battery coolant for an electric vehicle containing at least one kind of carbonates selected from the group consisting of propylene carbonate and butylene carbonate in an amount of 90 mass % or more with respect to a total mass of the coolant and water in an amount of 3 mass % or less with respect to the total mass of the coolant.