PV Encapsulant Polymer Composition for Storage Stability and PID Resistance
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Solution Overview
Problem
Existing encapsulant materials for solar cells lack adequate storage and transport stability, and they do not provide sufficient resistance against Potential Induced Degradation (PID), which can significantly degrade the power output of photovoltaic modules over time.
Innovation Solution
A polymer composition comprising 87.00 to 99.79 wt.% of a polymer selected from ethylene-vinylacetate copolymer, polyolefin elastomer, or a specific ethylene polymer, combined with 0.20 to 10.00 wt.% of a copolymer bearing functional groups from unsaturated carboxylic acid, and 0.01 to 3.00 wt.% of a specific compound according to Formula (a), which enhances storage and transport stability while improving PID resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If existing encapsulant materials are used for solar cells, then the basic encapsulation function is provided, but the storage and transport stability is insufficient
Solution Approach 1:
The patent uses a composite material system consisting of polymer (A) combined with copolymer (B) containing functional groups from unsaturated carboxylic acid and compound (C). This composite approach improves storage and transport stability by combining the base polymer with functionalized copolymer and specific compounds, achieving enhanced stability performance that neither component could provide alone.
2Object-affected harmful factors
If existing encapsulant materials are used, then the encapsulation function is provided, but the resistance against Potential Induced Degradation (PID) is insufficient
Solution Approach 1:
The patent employs a composite material formulation where polymer (A) is combined with copolymer (B) containing functional groups from unsaturated carboxylic acid and compound (C). This composite system specifically addresses PID resistance by incorporating the functionalized copolymer and compound (C) in controlled amounts, enabling the material to resist potential-induced degradation while maintaining power output retention above 95% after 96 hours of PID testing.
3Reliability
If the polymer composition is optimized for PID resistance, then the long-term power output is improved, but the formulation complexity increases
Solution Approach 1:
The patent optimizes the formulation by precisely controlling the weight percentage ranges of each component: polymer (A) at 87.00-99.79 wt.-%, copolymer (B) at 0.20-10.00 wt.-%, and compound (C) at 0.01-3.00 wt.-%. This parameter optimization approach achieves the desired long-term power output retention while managing formulation complexity through defined compositional ranges rather than exact specifications.
Data Source
AI summary
The present invention relates to a polymer composition (I) comprising at least the following components: (A) 87.00 to 99.79 wt.-% based on the overall weight of the polymer composition (I) of a specific polymer, (B) 0.20 to 10 wt.-% based on the overall weight of the polymer composition (I) of a specific copolymer of ethylene and (C) 0.01 to 3.00 wt.-% based on the overall weight of the polymer composition (I) of a compound according to Formula (a), whereby components (A), (B) and (C) add up to 100 wt.-%. In addition, the present invention refers to a photovoltaic module comprising at least one layer comprising polymer composition (I), to a method for improving the storage stability and/or transport stability of polymer (A) and to the use of components (B) and (C) for improving the storage stability and/or transport stability of a polymer (A).