Conductive Polymer Coated Textile Heaters
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Solution Overview
Problem
Conventional electrical heaters using copper-wire heating elements are heavy, inflexible, and unsuitable for integration into textiles, limiting their application in wearable and portable devices due to high electrical resistance requirements.
Innovation Solution
Development of electrically-heatable composite materials by coating textiles or fibers with an electrically-conducting polymer, such as PEDOT, to create lightweight, flexible heating elements with reduced sheet resistance, allowing for efficient Joule heating at lower voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If copper-wire heating elements are used, then heating efficiency is improved, but weight increases and flexibility decreases
Solution Approach 1:
The patent changes the material parameter from copper wire to conductive polymer coating, transforming the heating element from a rigid metal wire to a flexible polymer-based material that can be integrated into textiles while maintaining electrical conductivity and heating capability
Solution Approach 2:
The patent creates a composite structure by coating textile fibers with conductive polymer material, combining the lightweight, flexible properties of textiles with the electrical conductivity and heating properties of the polymer coating
2Power
If copper-wire heating elements are used, then heating efficiency is improved, but flexibility and ease of integration into textiles deteriorates
Solution Approach 1:
The patent changes the physical state and material properties of the heating element from rigid copper wire to flexible polymer-coated textile, enabling it to be cut, sewn, and integrated into garments while maintaining electrical functionality
Solution Approach 2:
The patent replaces the mechanical copper wire heating element with a polymer-based heating element that can be incorporated into textile structures, allowing the heating function to be integrated into fabric rather than requiring separate wire installation
3Reliability
If conductive polymer coating thickness is increased, then electrical resistance decreases, but mass increases
Solution Approach 1:
The patent optimizes the coating thickness parameter to achieve sufficient electrical conductivity without excessive mass, finding the optimal balance point where the polymer coating provides adequate electrical resistance reduction while maintaining lightweight properties
Solution Approach 2:
The patent applies the conductive polymer coating locally to the textile fibers rather than uniformly throughout the entire structure, concentrating the conductive material only where electrical functionality is needed to minimize overall mass while achieving required conductivity
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 enables the creation of lightweight, flexible, and breathable textile-based heaters that can be easily integrated into garments, providing effective local climate control and thermal management with minimal increase in mass and maintaining breathability and tactile feel.
Implementation Method 1
Typical electrical heaters use the concept of joule heating (also referred to as 'resistive heating' or 'ohmic heating') in one or more heating elements. In Joule heating, heat is generated when a voltage is applied across the heating element, where inelastic collisions between accelerated electrons and phonons occur as a current passes through a conductive material that forms the heating element.
Data Source
AI summary
A heating element composite comprises a substrate of one or more fibers or threads and an electrically-conductive polymer coating comprising an electrically-conductive polymer material deposited onto the one or more fibers or threads. A thickness of the electrically-conductive polymer coating is at least about 100 nanometers and the electrically-conductive polymer coating covers at least about 75% of an external surface area of the one or more fibers or threads of the substrate. The resulting heating element composite has a sheet resistance of from about 2Ω/□ to about 200Ω/□.