Bifacial Solar Module Backsheet Layout for Front and Rear Light Capture
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional solar cell modules are inefficient in collecting solar radiation from both the front and back sides, leading to wasted energy due to the design of the backsheet and packaging components which do not effectively allow light to be reflected or transmitted through.
Innovation Solution
A bifacial solar cell module design that incorporates a transparent top cover and a backsheet with integrated reflective and transparent portions, allowing light from both sides to be collected by the solar cells, with the reflective portion either printed on the backsheet or provided as a separate component, enhancing light scattering and absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional backsheet is used, then the module structure is simple, but solar radiation collection is inefficient
Solution Approach 1:
The backsheet is segmented into multiple functional zones: transparent portions that allow light transmission and reflective portions that reflect light. This segmentation enables different regions to perform different optical functions, improving overall solar radiation collection efficiency without significantly complicating the manufacturing process.
Solution Approach 2:
Different regions of the backsheet are assigned different optical properties (transparent vs. reflective) based on local requirements. The transparent portions are positioned to allow direct light transmission to solar cells, while reflective portions are positioned to capture and redirect otherwise wasted light, creating localized optimization of light management.
2Productivity
If light transmission from back side is blocked, then the backsheet provides better protection, but energy harvesting is reduced
Solution Approach 1:
The backsheet incorporates different optical properties in different regions, including transparent areas that allow light transmission for energy harvesting and potentially colored or opaque areas that provide protection. This optical property variation enables simultaneous achievement of energy harvesting and protection functions.
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 bifacial design significantly increases solar radiation collection by reflecting light that would otherwise be wasted from the front side and allowing transmission of light from the back side, resulting in improved energy harvesting efficiency.
Implementation Method 1
a reflective portion that reflects light coming from the front portion of the solar cell module
Implementation Method 2
a transparent portion that allows light coming from a back portion of the solar cell module to reach the solar cells
Implementation Method 3
Solar cells are well known devices for converting solar radiation to electrical energy
Data Source
AI summary
A bifacial solar cell module includes solar cells that are protected by front side packaging components and backside packaging components. The front side packaging components include a transparent top cover on a front portion of the solar cell module. The backside packaging components have a transparent portion that allows light coming from a back portion of the solar cell module to reach the solar cells, and a reflective portion that reflects light coming from the front portion of the solar cell module. The transparent and reflective portions may be integrated with a backsheet, e.g., by printing colored pigments on the backsheet. The reflective portion may also be on a reflective component that is separate from the backsheet. In that case, the reflective component may be placed over a clear backsheet before or after packaging.