Solar Cell Adhesive Application via Inversion
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Solution Overview
Problem
The application of adhesive on both surfaces of solar cells in solar cell modules can lead to adverse effects such as reduced adhesion strength, increased contact resistance, and degradation of photoelectric conversion characteristics, particularly when electrodes are provided on both surfaces.
Innovation Solution
A method and system for applying adhesive on solar cell modules, where the solar cell is inverted to apply adhesive on both the light receiving and back surfaces sequentially, ensuring precise application and controlled adhesion strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesive is applied on both surfaces of solar cell simultaneously, then adhesion strength is improved, but manufacturing complexity and quality control difficulty increase
Solution Approach 1:
The patent divides the adhesive application process into two separate sequential steps: first applying adhesive on one surface, then inverting the solar cell and applying adhesive on the opposite surface. This segmentation simplifies each individual application step, making quality control easier while still achieving strong adhesion on both surfaces through the inversion mechanism.
Solution Approach 2:
The patent employs inversion of the solar cell between the two adhesive application steps. After applying adhesive on the first surface, the solar cell is inverted and placed on a support member, allowing adhesive to be applied on the opposite surface without disturbing the first application. This inversion technique enables independent control of each application while ensuring both surfaces are properly adhered.
2Strength
If adhesive is applied on light receiving surface, then wiring member adhesion is improved, but contact resistance increases
Solution Approach 1:
The patent applies adhesive selectively only on the electrode regions of the solar cell surfaces, not on the entire surface. This localized application ensures that the wiring member achieves strong adhesion where needed (on the electrodes) while minimizing adhesive contact with the light receiving areas, thereby reducing contact resistance and preserving photoelectric conversion characteristics.
Solution Approach 2:
The patent applies adhesive on the electrodes before placing the wiring member, ensuring proper adhesion preparation. By preliminarily applying adhesive in the correct locations and allowing it to set slightly before wiring placement, the process achieves strong bonding while controlling the amount and distribution of adhesive to minimize negative effects on electrical performance.
3Ease of manufacture
If adhesive application is performed without inversion, then manufacturing simplicity is maintained, but adhesive application quality on both surfaces deteriorates
Solution Approach 1:
The patent uses inversion of the solar cell as a simple yet effective mechanism to access both surfaces for adhesive application. The inversion operation is straightforward - placing the solar cell on a support member and flipping it - which maintains manufacturing simplicity while enabling high-quality adhesive application on both surfaces by allowing each surface to be treated independently in its optimal orientation.
Data Source
AI summary
A solar cell module production method involves applying an adhesive on a light-receiving surface and a rear surface of a solar cell having electrodes on the light-receiving surface and the rear surface, and positioning and attaching a wiring material on the adhesive. Specifically, the solar cell, which is positioned with the light-receiving surface facing upward, is inverted so that the rear surface is facing upward, and the adhesive is applied on the rear surface; and then the solar cell is inverted once again so that the light-receiving surface is facing upward, and the adhesive is applied to the light-receiving surface.