Solar Cell Encapsulation Film Cross-Linking System
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Solution Overview
Problem
Existing encapsulation films for solar cells have a low specific electrical volume resistance, leading to potential-induced degradation (PID) issues, which reduce the efficiency and lifespan of photovoltaic modules, and current cross-linking systems are costly and negatively impact adhesion properties.
Innovation Solution
A composition comprising triallyl isocyanurate and a urea compound, such as 1,3-diallylurea, is used to create a cross-linking system that significantly increases the specific electrical volume resistance of encapsulation films without increasing costs, while maintaining excellent processability and UV and heat aging properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing cross-linking systems are used to produce encapsulation films, then the films achieve adequate mechanical stability, but the specific electrical volume resistance remains low leading to PID effects
Solution Approach 1:
The patent changes the chemical composition parameters of the cross-linking system by introducing urea compounds with specific molecular structures (divinyl urea, triallyl isocyanurate) to fundamentally alter the electrical resistance properties of the encapsulation film, transforming it from conductive to highly resistive to prevent PID effects
Solution Approach 2:
The patent creates a composite cross-linking system combining urea compounds with polyolefin copolymers, where the urea compound forms a three-dimensional cross-linked network structure that integrates with the polyolefin matrix to achieve both mechanical stability and high electrical resistance
2Reliability
If polyolefin ionomers and polysiloxanes are added to reduce PID effect, then the specific electrical volume resistance increases, but the adhesion properties deteriorate
Solution Approach 1:
The urea compound acts as an intermediary cross-linking agent that forms a three-dimensional network structure, mediating between the polyolefin copolymer chains to achieve high electrical resistance without compromising the interfacial adhesion that would be damaged by adding polyolefin ionomers or polysiloxanes
3Reliability
If complex cross-linking systems with multiple additives are used, then the PID resistance improves, but the manufacturing cost increases
Solution Approach 1:
The patent extracts and eliminates unnecessary additives from the cross-linking system, using only the essential urea compound (divinyl urea or triallyl isocyanurate) combined with polyolefin copolymer to achieve PID resistance, thereby reducing manufacturing complexity and cost while maintaining effectiveness
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 new cross-linking system enhances the specific electrical volume resistance of encapsulation films, reducing the risk of PID and improving the longevity and efficiency of solar cells, while maintaining film transparency and adhesion.
Implementation Method 1
A first composition (A) comprising (i) at least one compound (I) selected from the group consisting of triallyl isocyanurate, triallyl cyanurate... and (ii) at least one urea compound... The present invention relates to a second composition (B) comprising the first composition (A) and at least one polyolefin copolymer
Data Source
AI summary
The present invention relates to a first composition (A) comprising (i) at least one compound (I) selected from the group consisting of triallyl isocyanurate, triallyl cyanurate, wherein compound (I) is preferably triallyl isocyanurate; and (ii) at least one urea compound. The present invention also relates to a second composition (B) comprising the first composition (A) and at least one polyolefin copolymer. Finally, the present invention relates to the use of composition (B) for the production of a film for encapsulating an electronic device, in particular a solar cell.