Photovoltaic Module Back Panel Embossing for Gap Light Recovery
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Solution Overview
Problem
Existing photovoltaic modules suffer from low power efficiency due to sunlight being wasted through gaps and reflected to the ground, as conventional rolled glass fails to effectively utilize light transmitted through gaps and reflected from the ground.
Innovation Solution
The implementation of first embossing structures on the back panel of the photovoltaic module, angled between 42° to 80°, which reflect incident sunlight through gaps back to the rear surface and refract sunlight reflected from the ground for improved utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If rolled glass is used as the back panel with high light transmittance (90%-94%), then light can pass through effectively, but sunlight transmitted through gaps and reflected from the ground is wasted and cannot be utilized
Solution Approach 1:
The patent applies curved surface geometry by forming embossed structures with specific angles (42°-80°) on the back panel. These curved/reflected surfaces redirect light paths that would otherwise be lost, bending transmitted light back toward the solar cell and reflecting ground light upward, thereby converting wasted light into useful energy without changing the material itself
Solution Approach 2:
The patent converts the harmful effect of light loss through gaps and ground reflection into a beneficial effect. By positioning the back panel at specific angles and creating embossed structures, light that would be wasted is now reflected and redirected back to the solar cell, turning energy loss into energy gain
2Ease of manufacture
If the back panel is positioned horizontally for simple installation, then manufacturing and installation are easy, but light transmitted through gaps cannot be reflected back to the solar cell
Solution Approach 1:
The patent changes the angular parameter of the back panel from horizontal (0°) to specific inclined angles (42°-80°). This parameter change optimizes light reflection geometry while maintaining manufacturing feasibility through standardized angle ranges, balancing optical performance with ease of installation
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
This design enhances the utilization of sunlight, increasing the front and rear power of the photovoltaic module by 1.6% and 4.7% respectively, with a double-sided power gain of 2.7%, without additional cost.
Implementation Method 1
the incident sunlight can be reflected to the rear surface of the photovoltaic module after passing through the first embossing structure
Implementation Method 2
sunlight reflected by the ground can also be reflected to the solar cell string through the first embossing structure
Data Source
AI summary
Provided is a photovoltaic module, including: a plurality of solar cell strings arranged at intervals and each including a front surface and a rear surface arranged opposite to each other; a first encapsulation adhesive film and a back panel located on the rear surface of the solar cell string; and first embossing structures provided on one side of the back panel away from the first encapsulation adhesive film. An angle α between a side surface of the first embossing structure and a plane of the back panel is in a range from 42° to 80°.