The quality of the PV ribbon directly affects the efficiency of photovoltaic modules. The PV ribbon is an important raw material in the welding process of photovoltaic modules. The quality of the PV ribbon will directly affect the collection efficiency of the current of photovoltaic modules, and greatly affect the power of photovoltaic modules.

The PV ribbon must be welded firmly in the process of connecting battery pieces in series to avoid false welding. When choosing the PV ribbon, the manufacturer must decide the state of the PV ribbon according to the characteristics of the selected battery. Generally, the selection standard is to determine the thickness of the PV ribbon according to the thickness of the battery chip and the number of short-circuit current. The width of the PV ribbon shall be consistent with the width of the main cutting line of the battery. The hardness and softness of the PV ribbon generally depend on the thickness of the battery chip and the welding tools. Manual welding requires that the softer the PV ribbon is, the better it will be. After the soldering iron passes by, the soft PV ribbon will be in good contact with the battery piece. The stress produced in the welding process is very small, which can reduce the fragment rate. But the tensile strength of too soft welding tape will be reduced, and it is easy to break. For the automatic welding process, the PV ribbon can be slightly hard, which is conducive to the straightening and pressure welding of the PV ribbon by the welding machine. For the too soft PV ribbon, it is easy to be deformed by the machine welding, so as to reduce the yield of the product.

The electric soldering iron used for welding band has different choices according to different components. Generally speaking, the requirements for soldering iron of small photovoltaic modules such as welding lamps and lanterns are low, the area of small modules is small, and the requirements for heat of soldering iron are not high. Generally, 35W electric soldering iron can meet the requirements for welding lead-containing soldering band. However, when welding lead-free soldering band, the manufacturer is recommended to use 50W electric soldering iron as much as possible, and use it as much as possible Lead free long life soldering iron head, because lead-free soldering tin oxidizes fast, the damage to the soldering iron head is quite big.

It is relatively easy to weld with lead welding tape. Generally, as long as the appropriate flux is selected, the temperature compensation of soldering iron is sufficient. However, there are many troubles in the welding of lead-free welding tape, which many manufacturers feel headache about. First of all, a proper soldering iron should be selected for lead-free welding. For manufacturers, it is a good choice to choose a lead-free soldering station with adjustable power. Generally, the lead-free soldering station has DC power supply and adjustable voltage. The advantage of DC electric soldering iron is fast temperature compensation, which is incomparable to AC temperature regulating electric soldering iron. According to the thickness and area of the battery, the soldering iron of 70-100w should be selected for the welding of lead-free soldering tape. Generally, the soldering iron of less than 70W will have problems in lead-free welding. In addition, many kinds of lead-free adjustable temperature alternating current soldering iron (controlled by hot magnet) on the market are not suitable for welding large-area battery chips, because the silicon thermal conductivity of the battery chips is very good, the heat of the soldering iron head will quickly transfer to the silicon chip, which instantly reduces the temperature of the soldering iron head to below 300 degrees, and the temperature compensation of the soldering iron is not enough to ensure that the temperature of the soldering iron rises to 400 degrees, which is not enough to ensure lead-free welding For the firmness of the connection, the phenomenon is that the battery chip crackles during the welding process, which seriously causes the battery chip to crack immediately, which is caused by the shrinkage stress caused by the low solder temperature. The iron head of lead-free welding oxidizes very fast. To keep the iron head clean, it is better to embed the iron head in the soldering tin under the heating state. Before use, the excess soldering tin of the iron head should be removed. The contact end of the iron head and the PV ribbon shall be repaired to be consistent with the width of the PV ribbon as far as possible, and the contact surface shall be flat. The soldering flux shall be lead-free and residue free.

In the process of soldering the lead-free soldering tape, the manufacturer should pay attention to adjusting the welding habits of the workers. The fluidity of the lead-free soldering tin is not good, and the welding speed is much slower. When soldering, it is necessary to wait until the solder is completely melted before walking the soldering iron. The soldering iron should walk slowly. If the solder solidifies in the process of walking the soldering iron, it means that the temperature of the soldering iron head is low, and the temperature of the soldering iron head should be adjusted to rise to the soldering iron The head moves smoothly until the solder flows smoothly.