Liquid Ejection Dismantling of PV Modules Without Cell Damage
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Solution Overview
Problem
Existing methods for dismantling waste photovoltaic modules, such as the wet process using organic solvents and the dry process with blade cuts, are inefficient and cause damage to the cells, with the wet process being too slow and the dry process risking further cell damage.
Innovation Solution
A dismantling device for waste photovoltaic modules by liquid ejection, utilizing a table top with lifting trays, suction cups, and ejection mechanisms to evenly introduce solvent into the EVA layer, minimizing cell damage and reducing reaction time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If organic solvent is used to dissolve EVA in the wet process, then the cells can be separated from EVA, glass and backsheet, but the reaction cycle takes about 7 days which is too long for actual production
Solution Approach 1:
The patent divides the liquid ejection process into multiple stages with different ejection positions. The ejection mechanism moves from the edge of the photovoltaic module toward the center, ejecting liquid at different locations sequentially. This segmentation allows the solvent to penetrate the EVA layer systematically from outer to inner regions, significantly reducing the reaction cycle while ensuring complete separation.
Solution Approach 2:
The patent introduces a spatial dimension to the liquid ejection process by using a movable ejection mechanism that travels along the photovoltaic module. Instead of static ejection from one position, the mechanism dynamically changes ejection positions from edge to center, creating a dimensional approach that accelerates dissolution while maintaining separation quality.
2Ease of manufacture
If organic solvent permeates from outside to inside to dissolve EVA, then the separation process can proceed, but the cells are not evenly stressed and easily break
Solution Approach 1:
The liquid ejection is segmented into multiple positions along the photovoltaic module, progressing from edge to center. This segmented approach distributes the solvent penetration stress evenly across different regions, preventing concentrated stress on cells and reducing breakage while maintaining effective EVA dissolution.
Solution Approach 2:
The ejection mechanism dynamically adjusts its position during the process, moving from the edge toward the center of the module. This dynamic positioning allows the solvent to progressively penetrate the EVA layer in a controlled manner, distributing stress uniformly and preventing cell damage while ensuring complete separation.
3Productivity
If a blade is used to make longitudinal cuts on the backsheet to enable liquid ejection, then the reaction cycle is shortened, but the cut itself damages the cells and the dissolution process may further damage them
Solution Approach 1:
The patent extracts the need for mechanical cutting by implementing liquid ejection through the intact backsheet. The movable ejection mechanism delivers solvent through the original structure without requiring blade cuts, thereby eliminating cutting-induced cell damage while maintaining effective liquid penetration and fast reaction cycle.
Solution Approach 2:
The patent introduces a movable ejection mechanism as an intermediary between the liquid source and the EVA layer. This mechanism enables controlled liquid delivery through the backsheet without mechanical contact or cutting, serving as a mediator that achieves both fast reaction and cell protection.
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 device ensures even dissolution of the EVA layer, shortening the reaction cycle and reducing cell damage by using a controlled liquid ejection process with suction cups for stability and branch tubes for uniform solvent distribution.
Implementation Method 1
The bottom suction cup and the top suction cup are respectively provided with an air tube coupling, and each air tube coupling is connected to one air suction tube
Implementation Method 2
an organic solvent is typically used to dissolve EVA so as to separate the cells, EVA, glass and backsheet
Data Source
AI summary
A dismantling device for a waste photovoltaic module by liquid ejection includes a table top, a lifting tray, a bottom suction cup, a top suction cup and a chassis fixedly arranged on a lower side of the table top. A middle part of the table top is provided with a tray hole. The lifting tray corresponds to the tray hole up and down. A tray lifting motor is mounted in the chassis, and an upper end of an output shaft of the tray lifting motor is fixedly connected to the lifting tray. Left and right sides of the tray hole are respectively provided with an ejection mechanism X-direction sliding table, and a slider of the ejection mechanism X-direction sliding table is fixedly provided with an ejection mechanism.