Solar Battery EVA Film Concave Patterns Light Redirection
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Solution Overview
Problem
Conventional solar batteries suffer from reduced light incident efficiency due to a significant portion of light being directed to non-active areas, which decreases their overall performance as the size of the solar battery module increases.
Innovation Solution
Incorporating a polymer resin layer with concave patterns and an upper substrate with protrusions, the optical path of light is redirected from non-active areas to active areas by using an ethylene vinyl acetate (EVA) film with sloped sidewalls, enhancing light absorption and energy conversion efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the size of solar battery module increases, then the power output increases, but the portion of non-active area becomes considerable and light incident efficiency decreases
Solution Approach 1:
The patent introduces a third dimension by creating convex and concave patterns in the polymer resin layer. These three-dimensional structures redirect light paths that would otherwise hit non-active areas, effectively utilizing the vertical dimension to improve light distribution across the solar cell surface.
Solution Approach 2:
The polymer resin layer with convex/concave patterns acts as an intermediary optical element between the upper substrate and the solar cell. This intermediary structure modifies light paths before they reach the solar cell, redirecting light from non-active areas to active areas without requiring changes to the solar cell itself.
2Ease of manufacture
If conventional flat polymer resin layer is used, then the manufacturing process is simple, but light incident on non-active areas cannot be redirected
Solution Approach 1:
The convex and concave patterns are formed in the polymer resin layer before final assembly. This preliminary structuring of the polymer layer enables light redirection functionality to be built into the encapsulation material itself, combining structural and optical functions in a single component.
Solution Approach 2:
The patent modifies the physical structure of the polymer resin layer by introducing convex and concave patterns with specific geometric parameters. These parameter changes transform the flat polymer layer into an optical redirecting element while maintaining the material's fundamental properties and compatibility with existing manufacturing processes.
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 configuration effectively increases the amount of light incident on active solar cell areas, thereby improving the overall efficiency of the solar battery by redirecting light from non-active to active areas, leading to enhanced energy conversion.
Implementation Method 1
an ethylene vinyl acetate (EVA) film including concave patterns the sidewalls of which are sloped is disposed between the solar cell and the upper substrate, so that the optical path of light incident on the concave patterns can be changed
Data Source
AI summary
A solar battery includes a polymer resin layer on a solar cell and an upper substrate on the polymer resin layer. A pattern is formed in the polymer resin layer.