Unveiling the production process of photovoltaic modules

In the current era of vigorous development of green energy, photovoltaic (PV)
modules, as the core components of solar power generation systems, have every
aspect of their production process being of utmost importance. Renjiang
Photovoltaics, as a leader in the industry, adopts advanced production
techniques and a strict quality control system to ensure that every PV module
can efficiently and stably convert sunlight into electrical energy. Below, we
will provide an in-depth introduction to the production process of Renjiang
Photovoltaics’ modules, from raw material preparation to finished product
delivery, with technology and craftsmanship embodied in every step.

1. Glass feeding

Everything begins with the preparation of raw materials. High-quality
tempered glass is carefully selected and uploaded to the production line,
serving as the front panel of photovoltaic modules. It not only requires good
light transmittance but also excellent weather resistance and impact
resistance.

2. An EVA

Next, lay the ethylene-vinyl acetate copolymer (EVA) film on the glass. As an
adhesive, EVA not only connects the glass and the solar cell, but also serves as
a buffer and protector, ensuring the long-term reliability of the module.

3. Battery scribing and string welding

After precise dicing, photovoltaic cells are string-welded by automated
equipment to form cell strings. This process requires extremely high precision
and welding quality to ensure efficient and stable current transmission.

4. Stringing and overlap welding

Place the welded battery strings according to the predetermined layout, and
further connect them using the stacking welding technique to form a complete
battery array. This step has a direct impact on the power output and appearance
of the components.

5. Apply positioning tape

To ensure accurate positioning of materials in subsequent processes, special
positioning tape will be applied to the battery array to provide precise
guidance for the following lamination process.

6. Secondary EVA and backsheet

Lay the second layer of EVA film on the other side of the battery array and
cover it with backsheet material. The backsheet not only serves a protective
function but also needs to possess good insulation and weather resistance.

7. Edge banding

The edges around the components are sealed using specialized equipment to
prevent moisture intrusion and ensure long-term stable operation of the
components.

8. Laminating

The assembled components are fed into a laminator, where EVA is melted and
solidified under high temperature and pressure, tightly bonding all materials
together to form a sturdy overall structure.

9. Edge trimming and flipping inspection

The laminated components need to undergo edge trimming to remove excess
material, and undergo a flipping inspection to check for defects such as bubbles
and cracks inside the components.

10. Framing and junction box installation

Install aluminum alloy frames for the components to enhance their mechanical
strength, and install junction boxes to facilitate subsequent electrical
connections.

11. Junction box welding and potting adhesive

Cable welding is carried out inside the junction box, and potting compound is
used for sealing to ensure the safety and reliability of the electrical
connection.

12. Curing

After the junction box is potted, it needs to undergo a certain period of
curing treatment to ensure that the potting compound is fully hardened.

13. Back and front cleaning

Thoroughly clean both the front and back of the components to remove any
stains and dust left over from the production process, ensuring the
photoelectric conversion efficiency of the components.

14. Power test and safety test

Conduct power testing on components using professional equipment to ensure
that their power generation efficiency meets design requirements.
Simultaneously, perform safety testing to verify the safety and stability of the
components under various extreme conditions.

15. EL test

Using electroluminescence (EL) testing technology, we detect hidden defects
such as cracks and broken grid lines inside the solar cell to ensure product
quality.

16. Nameplate affixing and flipping inspection

Attach a nameplate containing product information to each component, conduct
a final flipping inspection, and proceed to the next step after
confirmation.

17. Automatic gear shifting

Based on the test results, components are automatically categorized to ensure
that products of different performance levels are applied appropriately.

18. Packaging and finished products

Finally, the components are carefully packaged to protect them during
transportation and storage, ultimately becoming finished photovoltaic modules
that can be installed and used.

conclusion

Every process of Renjiang photovoltaic modules embodies the power of
technology and the persistent pursuit of quality. From raw materials to finished
products, every step strictly follows international standards, and we are
committed to providing customers with efficient, reliable, and environmentally
friendly photovoltaic solutions.