Intermediate inspection of solar cells

Intermediate inspection of solar cells

1. Purpose

Through the intermediate inspection (that is, the mid-term inspection), a comprehensive inspection is carried out before the components are laminated to prevent the problems caused by the previous process from directly affecting the quality of the components. The lamination process after the intermediate inspection is an irreversible process, so the intermediate inspection is very important. CCIC mainly does appearance inspection, and the inspection content is mainly foreign matter inclusions.

2. Equipment and Tools

1) In the test bench.

2) Steel ruler.

3. Process requirements

1) Transfer the components on the transfer car to the intermediate test bench.

2) Check whether the polarity of the components is reversed.

3) Check whether all spacings in the components meet the drawing requirements.

4) After passing the inspection, fill in the “Process Flow Sheet”.

4. Inspection content

1) Whether the serial number in the component is consistent with the serial number on the “Process Flow Sheet”.

2) Whether the current and voltage values on the process sheet have been filled in, whether the operator has signed for confirmation, whether there are errors, etc.

3) Whether the positive and negative poles drawn by the components are consistent with the requirements of the process drawing.

4) Whether the length of the lead wire meets the requirements of the process drawing, and no discount is allowed.

5) Whether the back plate has scratches, scratches, wrinkles, pits, whether it accurately covers the entire glass, and whether the front and back sides are correct.

6) Whether the front and back of the EVA is correct, whether the size is appropriate, whether there is damage or dirt, etc.

7) Whether the front and back sides of the glass are correct, whether the number of bubbles meets the requirements, and whether there are scratches that exceed the standard.

8) Whether there are tin dross, virtual welding, fragments, missing corners, hair, fibers, foreign objects, residues of interconnecting bars and bus bars, etc. in the components.

9) Whether the isolation pads are placed in place or dislocated, and whether the bus bars and interconnecting bars are trimmed.

10) Whether the barcode is oriented correctly.

11) Whether the spacing (cell and cell, cell and glass edge, string and string, cell and busbar, busbar and busbar, busbar and glass edge) meets the requirements of the process drawing.

5. Precautions

1) Note that impurities may be on the reflector, at this time it needs to be clear whether it is inside the component or outside the component.

2) Impurities in the glass are sometimes mistaken as foreign objects in the stack of battery components, and should be identified.