Cost-Effective Solar Module Back Sheet Design
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Summary
Problems
The high manufacturing cost of solar cell back sheets is primarily due to the expensive Tedlar film, which also requires a multi-step adhesive application process, resulting in increased process complexity and cost.
Innovation solutions
A back sheet for solar cell modules is developed using a polyester film with an adhesive layer formed by an in-line coating method, comprising a modified polyolefin-based resin with a carboxyl group, a wetting agent, and a cross-linking agent, which enhances adhesion with EVA and eliminates the need for a Tedlar film, thereby simplifying the manufacturing process and reducing costs.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If Tedlar film is used in the back sheet, then water resistance and durability are improved, but manufacturing cost increases significantly
Why choose this principle:
The patent replaces expensive Tedlar film with a cheaper alternative structure consisting of PET film combined with adhesive layers that provide equivalent water resistance and durability functions at lower cost
Principle concept:
If Tedlar film is used in the back sheet, then water resistance and durability are improved, but manufacturing cost increases significantly
Why choose this principle:
The invention uses a composite structure of PET film with modified polyolefin-based adhesive layers to achieve the performance previously provided by Tedlar film, combining multiple materials to meet the required water resistance and durability standards
Application Domain
Data Source
AI summary:
A back sheet for solar cell modules is developed using a polyester film with an adhesive layer formed by an in-line coating method, comprising a modified polyolefin-based resin with a carboxyl group, a wetting agent, and a cross-linking agent, which enhances adhesion with EVA and eliminates the need for a Tedlar film, thereby simplifying the manufacturing process and reducing costs.
Abstract
Provided is a back sheet for a solar cell module, and more particularly, a back sheet having a novel multilayer structure substituted for an existing structure in which PVF(Tedlar) film/PET film/PVF (Tedlar) film are sequentially laminated, excellent hydrolysis resistance, and significantly excellent heat adhesion.