Photovoltaic Module Edge Sealing and Polyolefin Encapsulation
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Solution Overview
Problem
Existing photovoltaic cell modules face issues with water vapor ingress, degradation of encapsulation materials, and vulnerability at edges and corners due to lack of frame protection, leading to reduced service life and efficiency.
Innovation Solution
A photovoltaic cell module design featuring a transparent upper cover plate, first and second polyolefin encapsulation layers, and a backplane with an end part sealing block, which enhances weather resistance, prevents water vapor entry, and provides edge protection using a frame and reflecting coating to improve adhesive strength and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If tempered glass is used as backplane with airtight effect, then water vapor entry is prevented, but water vapor can still enter through encapsulation film at glass edges and acetic acid erosion occurs
Solution Approach 1:
The module is divided into distinct functional zones: the glass edges form a first sealing layer, the end part sealing block forms a second sealing layer at peripheral regions, and the encapsulation film forms a third sealing layer. This multi-layer segmentation creates redundant protection against water vapor and acetic acid erosion at the vulnerable glass edge regions.
Solution Approach 2:
The end part sealing block acts as an intermediary element positioned between the glass edges and the encapsulation film. It provides additional protection by sealing the gap between glass pieces and preventing acetic acid from reaching the encapsulation film, while also reinforcing the fragile glass edges.
2Reliability
If white EVA or PVB layer is used in back surface, then encapsulation is provided, but white part spreads to front surface over time blocking cells and causing hot spots
Solution Approach 1:
The invention changes the material parameter of the encapsulation film from conventional EVA or PVB to polyolefin material. This material substitution prevents the whitening and degradation issues that cause white part spreading to the front surface, while maintaining adequate encapsulation protection for the cells.
3Device complexity
If no frame is used at module edges, then structure is simplified, but edges and corners of tempered glass are vulnerable to cracking
Solution Approach 1:
The end part sealing block functions as a protective shell or frameless border that reinforces the glass edges and corners without requiring a traditional rigid frame structure. This provides mechanical strength to prevent cracking while maintaining the frameless aesthetic and simplicity of the module design.
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 design significantly prolongs the service life of the module by preventing water vapor ingress, reducing degradation, and enhancing structural integrity and efficiency through improved adhesive strength and edge protection.
Implementation Method 1
have an advantage of being capable of letting an ultraviolet light absorbed by an EVA ultraviolet absorber run through, and then the run through ultraviolet light may be converted into electrical energy
Implementation Method 2
an end part sealing block is further disposed between the transparent upper cover plate and the backplane, and the end part sealing block is located at peripheries of the first polyolefin encapsulation layer, the cell group layer, and the second polyolefin encapsulation layer
Implementation Method 3
a transparent upper cover plate, a first polyolefin encapsulation layer, a cell group layer, a second polyolefin encapsulation layer, and a backplane that are sequentially disposed in a laminated manner
Data Source
AI summary
A photovoltaic cell module includes: a transparent upper cover plate, a first polyolefin encapsulation layer, a cell group layer, a second polyolefin encapsulation layer, and a backplane that are sequentially disposed in a laminated manner, where outer edges of the transparent upper cover plate and the backplane exceed outer edges of the first polyolefin encapsulation layer, the cell group layer, and the second polyolefin encapsulation layer, an end part sealing block is further disposed between the transparent upper cover plate and the backplane, and the end part sealing block is located at peripheries of the first polyolefin encapsulation layer, the cell group layer, and the second polyolefin encapsulation layer.