Beryllium-Free Conductive Busbars for Electrochromic Mirrors
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Solution Overview
Problem
Commercial electrochromic (EC) rearview mirrors contain hazardous materials like beryllium, which pose environmental and health risks during manufacturing, use, and disposal, and existing technologies do not adequately address the need for environmentally friendly and cost-effective solutions for reducing material usage and improving performance.
Innovation Solution
The development of beryllium-free conductive busbars and advanced perimeter sealants using nanoparticles and organic matrices, which enhance conductivity and adhesion while reducing material costs and environmental impact, along with the use of ionic liquids to minimize electrolyte thickness in EC devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If beryllium-containing busbars are used in EC mirrors, then electrical conductivity and mechanical strength are improved, but environmental safety and health risks deteriorate
Solution Approach 1:
The patent removes beryllium from the busbar composition entirely, extracting the harmful element while maintaining the functional requirements through alternative materials and structural designs
Solution Approach 2:
The patent employs alternative materials such as copper, aluminum, or composite materials that are environmentally benign and can be easily disposed of or recycled, replacing the expensive and hazardous beryllium-copper alloy
2Power
If conventional conductive adhesives with large silver particles are used, then electrical connectivity is achieved, but material cost increases
Solution Approach 1:
The patent changes the particle size parameter of conductive fillers from conventional large micrometer-sized particles to nanoscale particles (1-100 nm), which fundamentally alters the conductivity mechanism and reduces material requirements
Solution Approach 2:
The patent develops composite conductive materials combining nanoparticle fillers with polymer matrices, creating adhesives that achieve high electrical connectivity with reduced silver content through optimized composite structure
3Reliability
If traditional perimeter sealants are used, then basic sealing function is provided, but bonding reliability and adhesion deteriorate
Solution Approach 1:
The patent formulates multi-component sealant compositions combining base polymers with silane crosslinkers and coupling agents, creating composite materials that achieve enhanced adhesion and bonding reliability through chemical networking
Solution Approach 2:
The patent modifies sealant properties by adjusting composition parameters including crosslink density, molecular weight distribution, and additive concentrations to optimize both bonding performance and processability
4Reliability
If thicker electrolyte layers are used in EC devices, then device reliability is improved, but device thickness and material consumption increase
Solution Approach 1:
The patent changes the physical state and composition parameters of the electrolyte, using ionic liquids with optimized viscosity and ionic conductivity to achieve reliable ion transport in thinner film configurations
Solution Approach 2:
The patent employs porous electrode structures with controlled porosity (30-70%) that enhance ion transport pathways, allowing reduced electrolyte thickness while maintaining reliable electrochromic operation through improved mass transport efficiency
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 solution results in safer, more environmentally friendly EC devices with reduced material usage and lower production costs, improved performance, and enhanced reliability, while minimizing the risks associated with hazardous materials like beryllium and reducing electrolyte consumption.
Implementation Method 1
conductive busbars, both materials and processes, so that these can be made without beryllium
Implementation Method 2
use of ionic liquids to minimize electrolyte thickness in EC devices
Implementation Method 3
Electrochromic rearview mirrors have long been incorporated into vehicles for providing automatic control of glare (variable transmission)
Data Source
AI summary
This invention discloses conductive busbars and sealants for electrooptic devices including electrochromic mirrors and windows. The conductive busbars are formed from materials comprising nanoparticles, and the sealants comprise of additives that promote a two phase morphology and use of adhesion promotion additives with crosslinkers. Methods to deposit busbars and then to connect these busbars to electrical connectors are also disclosed.