EV Coolant Composition With Low Conductivity and Corrosion Protection
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Solution Overview
Problem
Coolants for electric vehicles often pose a risk of electrical conductivity and corrosion, leading to potential short circuits and fires, especially when used in power units and batteries, as they lack adequate insulating and antirust properties.
Innovation Solution
A coolant composition containing a specific siloxane compound, antirust agents, and a base of water or glycols, with controlled pH and electrical conductivity, to provide excellent insulating and antirust properties, preventing corrosion and ensuring safe temperature control in electric vehicles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional coolants containing ionic corrosion inhibitors are used, then corrosion protection is improved, but electrical conductivity increases leading to short circuit risk
Solution Approach 1:
The patent removes ionic corrosion inhibitors from the coolant composition entirely. Instead, it uses organic corrosion inhibitors (carboxylic acids and their derivatives) that provide corrosion protection without introducing ions that would increase electrical conductivity. This extraction of the harmful ionic component while retaining the protective function directly resolves the contradiction between corrosion protection and electrical conductivity.
Solution Approach 2:
The patent changes the chemical parameter of the corrosion inhibitor from ionic compounds (traditional inorganic inhibitors) to non-ionic organic compounds (carboxylic acids with specific structures). This parameter change in the chemical nature of the inhibitor maintains corrosion protection capabilities while eliminating the electrical conductivity problem associated with ionic inhibitors.
2Object-affected harmful factors
If coolants with high insulating property are used, then short circuit risk is reduced, but corrosion protection may be compromised
Solution Approach 1:
The patent introduces organic carboxylic acid compounds as intermediary substances that mediate between the requirement for low electrical conductivity and adequate corrosion protection. These organic inhibitors act as a bridge, providing the necessary protective function without the ionic characteristics that would compromise insulating properties.
Solution Approach 2:
The coolant composition uses a composite approach by combining specific organic carboxylic acid inhibitors (with particular structural characteristics) with the base coolant. This composite material strategy creates a synergistic effect where the organic inhibitors provide both the required corrosion protection and maintain low electrical conductivity simultaneously.
3Use of energy by moving object
If coolants are used for direct battery cooling, then temperature control efficiency is improved, but the coolant must simultaneously provide high insulating and antirust properties
Solution Approach 1:
The patent creates a universal coolant composition that simultaneously performs multiple functions: efficient heat transfer (thermal-exchange), electrical insulation (low conductivity), and corrosion protection (antirust properties). The organic carboxylic acid inhibitors enable the coolant to fulfill all these requirements without compromise, making it suitable for direct battery cooling applications.
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 composition effectively maintains low electrical conductivity and prevents corrosion of metals, ensuring safe and efficient temperature control for electric vehicle power units, reducing the risk of short circuits and fires.
Implementation Method 1
a siloxane compound expressed by General Formula 1 below... electrical conductivity is 500 μS/cm or lower
Implementation Method 2
containing one or more types of antirust agents selected from inorganic acids, organic acids, triazoles, thiazoles, and amines
Implementation Method 3
the water-cooling method has an advantage in that it achieves good thermal-exchange efficiency
Implementation Method 4
achieves good thermal-exchange efficiency and thus facilitates temperature control
Data Source
AI summary
A coolant composition for electric vehicles contains a siloxane compound expressed by the following General Formulawherein R1 and R2 are each identical to or different from each other, selected from the groups including C1 to C20 alkyl groups and amino groups as well as C1 to C20 alkylamino groups; X1, X2, X3, and X4 are each identical to or different from one another, selected from the groups including hydroxy groups, alkoxy groups, and alkyl groups; and n is 1 or greater but no greater than 500.