Photovoltaic Backsheet Stack With Moisture Barrier Layer
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Solution Overview
Problem
Conventional backsheet stacks for photovoltaic modules provide inadequate moisture protection, leading to damage from penetrating moisture, especially through microcracks caused by environmental influences and UV radiation.
Innovation Solution
A backsheet stack comprising an outer protective layer, an inner adhesion layer, and at least one barrier layer, with the barrier layer positioned between the outer protective and inner adhesion layers to form a sealing layer for moisture penetration, along with a reinforcing layer for mechanical stability, using materials like PET, PVDF, and EVA to effectively block moisture and UV radiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional multilayer stack with reinforcing layer, adhesion layer, and protective layer is used, then mechanical stability and UV protection are provided, but moisture protection is inadequate
Solution Approach 1:
The backsheet stack is segmented into functionally distinct layers: outer protective layer for UV protection, barrier layer for moisture protection, reinforcing layer for mechanical stability, and inner adhesion layer for bonding. Each layer is optimized for its specific function, allowing the system to achieve comprehensive protection without excessive complexity.
Solution Approach 2:
The invention uses composite material structure combining different polymer layers with distinct properties. The outer protective layer uses UV-resistant materials, the barrier layer uses moisture-resistant materials, and the reinforcing layer provides mechanical strength. This composite approach enables simultaneous achievement of multiple protection functions.
2Stability of the object's composition
If the backsheet stack uses multiple adhesive coatings to bond layers, then layer adhesion is improved, but moisture penetration risk increases due to additional bonding interfaces
Solution Approach 1:
Adhesive coatings are applied selectively only where bonding is required between specific layers, rather than uniformly across all surfaces. The barrier layer is designed with local moisture-blocking properties at critical interfaces, reducing moisture penetration risk while maintaining necessary adhesion through targeted adhesive application.
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 additional barrier layer significantly reduces moisture penetration and diffusion, ensuring long-term reliability and increased lifetime of photovoltaic modules by equalizing moisture gradients and blocking further moisture entry.
Implementation Method 1
The outer protective layer is configured to provide protection from ultraviolet (UV) radiation
Implementation Method 2
The at least one barrier layer is/are formed between the outer protective layer and the inner adhesion layer and forms a sealing layer for moisture penetration
Data Source
AI summary
A backsheet stack for a photovoltaic module is disclosed. The photovoltaic module includes a laminate with embedded solar cells. The backsheet stack includes: an outer protective layer, an inner adhesion layer, at least one barrier layer, and at least one reinforcing layer. The outer protective layer is configured to provide protection from ultra-violet radiation. The inner adhesion layer is configured to provide adhesion to a laminate with embedded solar cells. The at least one barrier layer is formed between the outer protective layer and the inner adhesion layer and forms a sealing layer to moisture penetration. The at least one reinforcement layer is formed between the outer protective layer and the inner adhesion layer and provides mechanical stability for the backsheet stack.