| This time, we want to introduce
a photovoltaic module manufacturing process we have learnt from
a training at Showa Solar Energy Corporation. Some details
of the processes which we were not taught in the training have
been ommited. |
Main Process Flow
2. Solder
Paste
At first, solder paste is mounted
on the negative electrode (surface) of the solar cell securely.
Soldering securely will prevent trouble
in the next steps.
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3. Ribbon
Electrode
Ribbon electrode should be
attached as straight as possible on the electrode of the solar
cell. If it is not attached in a straight
line, there will be problems in the strings process.
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4. Soldering
The solar cell with ribbon
electrodes is left on a hot plate for a few seconds until
soldered securely. The solar cell is removed from the hot
plate after checking if there is no gap between the solar
cell and the ribbon electrode. Characteristics
of the solar cell can be affected by leaving it on the hot
plate for too long.
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5. Solder
Paste
Solder paste is mounted on
the positive electrode (back side) of the solar cell. It's
needed when solar cells are connected in series by ribbon
electrodes.
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6. Strings
The solar cells are connected
in series with appropriate space between them. Inappropriate
space can cause fractures on the solar cell in the laminating
process. Firstly, ribbon electrodes are soldered on
the first solar cell in the string. Next, Four or five solar
cells are aligned in a string, and the positive electrode
of the first solar cell is connected to the negative electrode
of the next solar cell by soldering.
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7. Cleaning
& Taping
Strings are connected in series
to each other by tape temporarily. The chloric component of
the soldering flux has to be removed by cleaning because it
causes changes in color and corrosion over long-term use.
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8. Cell Circuit
Each electrode of strings is
connected to each other by ribbon electrodes. Be
careful not to break the solar cells at this time.
Moreover, a copper electrode is connected to the electrode
of the last solar cell in the string.
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