How the recycled PV modules are made and the detailed production process
Created date: 2019/12/10
Category: Reclaim News

PV module manufacturing process by battery sorting - single welding - series welding - splicing (ie battery series, splicing together) - intermediate test (intermediate test point: infrared test and visual inspection) - lamination - trimming - after appearance Layer - Layer Rear Infrared - Frame (General Aluminum Frame) - Assembly Junction Box - Cleaning - Test (this link is also divided into infrared) test and visual inspection. Determine the level of the component) - packaging.

(1) Recycled PV module battery test

Due to the randomness of manufacturing conditions, the performance of the produced batteries is not the same, so in order to effectively combine batteries having the same or similar performance, it is necessary to classify them according to their performance parameters. Battery testing classifies the battery by testing its output parameters (current and voltage). . In order to improve the battery utilization, please make a qualified battery module.

(2) Front side welding of recycled photovoltaic modules

The tape is soldered to the main grid of the positive (negative) side of the battery. The tape is tinned copper strip. The welding machine we use can spot weld the tape to the main grid in a multi-point manner. The welding heat source is an infrared lamp (the thermal effect of infrared rays). The length of the electrode is approximately twice the length of the battery side. The additional electrode is attached to the back electrode of the panel after soldering on the back side.

(3) Recycled PV module rear serial connection

Backside soldering is a series of cells that are joined together to form a group of components. The current process is manual. The positioning of the battery is primarily dependent on the diaphragm. There are grooves on the board. The size of the groove corresponds to the size of the battery. The position of the groove has been designed. Different sizes of components use different templates. The operator uses a soldering iron and a wire to weld the positive electrode (negative electrode) of the "front battery" to the rear electrode (positive electrode) of the "post battery", thereby "welding" the positive and negative electrodes of the "positive electrode". The rear battery is "connected in series and the leads are soldered to the assembly line.

(4) Laminated laminated photovoltaic modules

After the back surface is connected in series and passed through inspection, the assembly line, glass and cut EVA, fiberglass and backsheet are laid in certain layers and ready for lamination. A layer of reagent (primer) is applied to the glass in advance to increase the bond strength between the glass and the EVA. When laying, ensure the relative position of the battery string and the glass, adjust the distance between the batteries, and lay a good foundation for lamination. (Pavement level: bottom to top: tempered glass, EVA, battery, EVA, fiberglass, backboard).

(5) Recycling of photovoltaic module components

The battery was placed in a laminator, air was drawn out of the assembly, and the EVA was heated to fuse the battery, glass, and backsheet together; the assembly was finally cooled. The lamination process is a key step in the production of components. The lamination temperature and lamination time are determined according to the nature of the EVA. When we use fast curing EVA, the lamination cycle time is about 25 minutes. The curing temperature was 150 °C.

(6) Recycled PV module trimming

During the lamination process, the EVA melts and stretches to form an edge due to pressure, so it should be removed after lamination.

(7) Recycled photovoltaic module frame

Similar to installing a glass frame; mounting an aluminum frame on the glass module increases the strength of the module, further sealing the battery module and extending battery life. The gap between the frame and the glass member is filled with silicone. The corners are connected to each other.

(8) Recycled PV module soldering junction box

A box is soldered to the back of the component to facilitate connection between the battery and other devices or batteries.

(9) High-voltage test of recycled photovoltaic modules

The high voltage test is to apply a certain voltage between the component frame and the electrode lead to test the withstand voltage and dielectric strength of the component to ensure that the component is not damaged under adverse natural conditions (lightning, etc.).

(10) Recovered PV module testing

The purpose of the test is to calibrate the output power of the battery, test its output characteristics, and determine the quality level of the component. Currently, standard test conditions (STC) are primarily used to simulate sunlight. In general, the test time of the panel is about 7-8 seconds

Next:No More