What are the specific application scenarios of high temperature adhesive tape in photovoltaic module packaging process?

In the process of photovoltaic module packaging, high temperature adhesive tape mainly has the following specific application scenarios:

I. Application before lamination

Positioning and fixing of battery piece

After the cells are placed on the packaging material (such as EVA film), they need to be positioned to ensure their accurate position in the subsequent lamination process. High-temperature adhesive tape can gently fix the battery piece on the EVA adhesive film to prevent the battery piece from shifting during handling or placing the backboard. For example, in the automatic production line, the components may be slightly shaken during transmission, and the high-temperature adhesive tape can ensure that the battery pieces are kept in the designed position, thus ensuring that the spacing between battery strings meets the requirements and avoiding short circuits between battery pieces.

Material pre-bonding

Photovoltaic modules are usually composed of multiple layers of materials, including the battery sheet and EVA film, as well as the back plate and other materials. After the backboard is placed on the battery and EVA film, the high temperature adhesive tape can be used to pre-attach these materials. It can make the backboard, EVA adhesive film and battery sheet initially adhere together before lamination, forming a relatively stable structure, which is convenient for putting the whole assembly into the laminator. This can reduce the air gap between materials and improve the lamination quality.

Second, the application in the lamination process

Prevent material from slipping and spilling.

In the lamination process, the high temperature and high pressure environment will make the packaging materials (such as EVA film) soften and flow. High-temperature adhesive tape can play a blocking role to prevent EVA film from overflowing from the edge of the module. If EVA film overflows, it will not only waste materials, but also pollute the surface of the laminator and affect the normal operation of the equipment. At the same time, the adhesive tape can also prevent the materials such as the battery sheet and the back plate from slipping during the lamination process, ensure the close adhesion between the material layers, and ensure the flatness and structural stability of the assembly.

Pressure uniform distribution assistance

The laminator tightly combines the material layers by applying uniform pressure. High temperature adhesive tape can help to distribute pressure evenly to some extent. Because of the existence of adhesive tape, the material can also be subjected to relatively uniform pressure at the edge, so as to avoid the situation that the local pressure is too large or too small. This is helpful to improve the bonding quality between EVA film and battery sheet and backplane, and reduce the generation of bubbles. For example, if the pressure is uneven, bubbles may be generated in the EVA film, which will affect the light transmittance and reduce the photoelectric conversion efficiency of the module.

Third, the application after lamination

Edge sealing and protection

After lamination, the edges of photovoltaic modules need to be sealed to prevent the invasion of external water vapor, dust and corrosive gases. High-temperature adhesive tape can be used as an edge sealing material and closely attached to the edge of the module to form a barrier. For outdoor photovoltaic modules, this sealing effect is particularly important. For example, in a humid environment, if water vapor enters the module, the EVA film will be hydrolyzed, which will reduce its adhesion performance, and may also lead to electrode corrosion of the battery, which will affect the service life and performance of the module.

Fixed component identification

On the edge or surface of photovoltaic modules, identification labels are usually needed to record the module model, production date, power and other information. High-temperature adhesive tape can be used to fix these labels to ensure that the labels will not fall off during the long-term use of the components (which may experience various environmental conditions such as high temperature, low temperature and humidity). This is very important for the quality traceability and maintenance management of components.