Polyurethane Foam Composition for Fast-Curing Battery Potting
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Solution Overview
Problem
Current potting technologies for battery packs fail to provide satisfactory physical properties and electrical stability while meeting stringent flammability standards, often requiring high levels of flame retardants and resulting in inefficient processes.
Innovation Solution
A two-component polyurethane foam composition with a balanced reactivity profile, comprising a polyol component and an isocyanate component, which includes minimal flame retardants and blowing agents, allowing for improved flowability and rapid curing to achieve enhanced physical properties and compliance with V0 flammability standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional potting technologies are used to meet V0 flammability standards, then flammability requirements are satisfied, but flame retardant content must be elevated and physical properties deteriorate
Solution Approach 1:
The patent changes the chemical parameters of the polyol component by specifying hydroxyl group functionality (3-7) and hydroxyl group number (300-1000 mg KOH/g), which fundamentally alters the reaction characteristics and foam structure formation, enabling V0 flammability rating with only 1-15 wt% flame retardant while achieving tensile strength >3.5 MPa
Solution Approach 2:
The patent creates a composite material system combining specific polyols (polyester or polyether with defined functionality), isocyanate compounds, blowing agents, and flame retardants (1-15 wt%), where the synergistic interaction of components achieves both flammability resistance and mechanical strength without relying on high flame retardant content
2Productivity
If fast curing is achieved to reduce molding cycle time, then productivity improves, but viscosity increase becomes too rapid allowing sufficient flow to fill gaps
Solution Approach 1:
The patent creates a dynamic viscosity profile through the specific polyol-isocyanate system where viscosity remains low initially (enabling flow into gaps) then increases rapidly during curing (enabling quick demolding), with the NCO/OH ratio (0.5:1 to 5:1) controlling the kinetics of this dynamic transition
Solution Approach 2:
The patent incorporates blowing agents that generate gas bubbles during the reaction, creating foam expansion that occurs simultaneously with curing, ensuring gap filling before the material fully sets and cures
3Quantity of substance
If multi-layer cylinder batteries are piled with small gaps to increase energy density, then battery energy density improves, but potting material must flow into small gaps while maintaining physical properties
Solution Approach 1:
The patent adjusts the polyol hydroxyl group number (300-1000 mg KOH/g) and functionality (3-7) to optimize the initial viscosity and reactivity, enabling the material to flow into small gaps between battery layers while maintaining sufficient strength after curing
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 polyurethane foam composition achieves high tensile strength, low thermal conductivity, and meets V0 flammability requirements with reduced flame retardant usage, enabling efficient and cost-effective potting processes for battery packs.
Implementation Method 1
a polyurethane foam composition, comprising: (A) a polyol component, comprising one or more polyols selected from the group consisting of a polyester polyol, a polyether polyol, and the combination thereof
Implementation Method 2
one or more blowing agents; wherein the NCO/OH ratio of the isocyanate component to the polyol component is within the range of from 0.5:1 to 5:1
Data Source
AI summary
The present disclosure relates to a polyurethane foam composition, comprising (A) a polyol component, comprising one or more polyols selected from the group consisting of a polyester polyol, a polyether polyol, and the combination thereof, wherein the one or more polyols have an average hydroxyl group functionality of from 3 to 7 and an average hydroxyl group number of from 300 to 1000 mg KOH/g; and (B) an isocyanate component, comprising one or more isocyanate compounds; wherein in either or both of the (A) polyol component and the (B) isocyanate component, the polyurethane foam composition further comprises one or more flame retardants in an amount of no more than 15 percent by weight based on the total weight of the polyurethane foam composition, and, one or more blowing agents; and wherein the NCO/OH ratio of the isocyanate component to the polyol component is within the range of from 0.5:1 to 5:1. The present disclosure further relates to a method for potting a battery by using the polyurethane foam composition.