Method for separating EVA and battery piece in solar module

Abstract

The invention discloses a method for separating EVA and a battery piece in a solar module. The method comprises the steps of 1) removing an aluminum frame of the solar module through a frame removingmachine; 2) heating the frameless assembly, and manually tearing off a TPT back plate; (3) conducting EVA scratching treatment; 4) carrying out embrittlement of EVA; 5) stripping the EVA and ultra-white glass; 6) stripping the EVA and the battery piece; and 7) detecting and classifying the battery pieces, re-detecting the taken-out battery pieces, re-packaging the qualified battery pieces into anassembly, and extracting metals such as silver and aluminum from the battery pieces with unqualified electrical properties or damaged battery pieces by utilizing a wet metal dissolving and extractingprocess to obtain a high-purity silicon wafer. The invention innovatively provides a method for embrittlement of EVA at a low temperature, EVA is dissociated from the battery piece by utilizing the embrittlement and cracking properties of EVA at a low temperature (glass state temperature) or below, and the complete and lossless battery piece is finally stripped through mechanical force in a low-temperature state.

Description

technical field [0001] The invention relates to a method for separating EVA and battery sheets in a solar module. Background technique [0002] The general structure of a crystalline solar cell module from top to bottom is composed of ultra-clear tempered glass, EVA, solar cells, EVA and TPT backplane. [0003] In the production process of solar cell modules, after lamination, if individual cells are cracked or dark in EL detection, the modules need to be downgraded. The main reason here is that the qualified cells cannot be completely taken out, so that Repackaging; in the recycling process of solar-grade battery components, if there are cells with complete structure, efficiency that meets current needs, and minimal attenuation in the component, it can be considered to take it out completely, which will have relatively large economic value. [0004] Since it is impossible to disassemble solar panels to obtain complete cells by simply using manual and tools, many scholars a...

AI Technical Summary

Problems solved by technology

[0005] The main problem of the wet dismantling method is that the organic solvents are expensive and most of them are poisonous; the dry dismantling method mainly uses high temperature, generally 400-500°C, to pyrolyze and carbonize the EVA, thereby separating the glass and the clean battery slices, but high temperature will destroy the PN junction, metal electrodes and bus bars in the solar cell, etc., and it is impossible to obtain usable solar cells

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