What are the functions of the application of high temperature adhesive tape in photovoltaic field?
The special high-temperature adhesive tape for photovoltaic field is the core auxiliary material in the whole process of photovoltaic module production, installation and operation and maintenance, which meets the core requirements of high-temperature processing, outdoor weather resistance, insulation protection and stable adhesive force in photovoltaic industry. It has been applied from battery packaging to module installation and power station operation and maintenance, and its core function revolves around protection, fixation, insulation, sealing and positioning, and it needs to meet the supporting requirements of photovoltaic module's 25-year outdoor service life. The following are the specific applications and functions of each link.
First, the production process of photovoltaic modules (core application determines the quality and life of modules)
This is the main application scenario of high-temperature adhesive tape, which is suitable for high-temperature processing procedures (150~200℃) such as assembly lamination, welding and packaging. The adhesive tape should be resistant to high temperature, free of residual adhesive and release harmful substances, so as to avoid affecting the photoelectric conversion efficiency and reliability of the assembly.
Battery welding/typesetting positioning
Use high-temperature resistant polyimide (PI) high-temperature adhesive tape to stick the edge and grid line of the battery. Firstly, fix the position of the battery on the bus bar/backplane to prevent it from shifting during welding and typesetting. The second is to protect the grid line and silicon wafer on the surface of the battery, so as to avoid solder splashing and high temperature scalding the silicon wafer during welding and prevent the battery from cracking; The third is to insulate the battery piece from the metal parts to avoid short circuit.
Protection and sealing of lamination process
When the module is laminated (high temperature and high pressure environment, 130~180℃), use high temperature adhesive tape to stick the inside of the module frame and the glass edge, seal the lamination area, prevent the EVA/POE adhesive film from overflowing, avoid overflowing the laminating machine and polluting the module surface, and at the same time, the adhesive tape can protect the glass edge from being damaged by the laminating machine; It can also be used to shield the non-encapsulated area of the component and accurately limit the adhesive film bonding range.
Backplane/junction box fixing and insulation
Before the junction box is pasted, it is temporarily fixed on the designated position of the component back plate with high-temperature adhesive tape to ensure the accurate positioning of the junction box after lamination; At the same time, the adhesive tape can insulate and isolate the metal terminal of the junction box from the backboard, so as to prevent short circuit caused by moisture when used outdoors, and the adhesive force of the adhesive tape is stable at high laminating temperature, without shedding or residual glue.
Edge wrapping protection of components
In the production of some thin photovoltaic modules, the edge of the module is wrapped with high-temperature resistant cloth-based high-temperature adhesive tape, which prevents the glass and back plate from delaminating during lamination, and at the same time improves the impact resistance and aging resistance of the edge of the module. The adhesive tape can be retained or peeled off later, and there is no residual adhesive after peeling.
Second, the photovoltaic module detection/packaging link
The core functions of electrical performance testing, storage and transportation of adapter components before leaving the factory are temporary fixation, protection against scratching and identification isolation.
Temporary fixation of detection link
When testing the electrical properties of components, the test electrodes and wires are temporarily fixed with high-temperature adhesive tape to ensure good contact during testing, and the adhesive tape is resistant to high temperature and insulating, and will not fall off due to slight temperature rise during testing, so it is convenient to peel off after testing, and there is no residual adhesive to pollute the surface of components.
Packaging, transportation, protection and scratch prevention
When the components are stored and transported, the glass surface, junction box, plug and other parts that are easy to be scratched are pasted with high-temperature adhesive tape to prevent scratches caused by friction during handling and stacking and prevent the plug from being oxidized by moisture; It can also be used to isolate adjacent components and prevent them from colliding with each other. The adhesive tape has good outdoor weather resistance and will not stick to the surface of components even after long-term storage.
Factory identification and isolation
Use writable high-temperature adhesive tape to mark the module model, power, production date and other information, and stick it on the back plate of the module, which is clear, temperature-resistant and sun-resistant, and it is not easy to fall off outdoors; It can also be used to isolate the metal frame of the assembly from the packaging material to prevent the frame from oxidation and rust.
Third, the installation of photovoltaic power plants
Adapting to the field installation of roof and ground photovoltaic power stations, the core functions are auxiliary fixation, sealing and waterproofing, insulation and isolation, wind resistance and anti-detachment, and the adhesive tape needs to meet the harsh working conditions of outdoor high sun, high humidity and alternating high and low temperatures.
Support and assembly fixing assistance
When the ground power station is installed, the photovoltaic module is temporarily fixed on the aluminum alloy bracket with high-temperature resistant and pressure-sensitive high-temperature adhesive tape, which is convenient for the installer to punch holes and screw, and ensures the levelness and accurate spacing of the module installation. After the fixing is completed, the adhesive tape can be retained to enhance the fit between the module and the bracket and prevent the module from slightly shaking due to strong outdoor wind.
Roof power station sealing waterproof
When the photovoltaic power station with colored steel tile and glazed tile roof is installed, the high-temperature resistant butyl high-temperature adhesive tape (both high-temperature and waterproof) is stuck on the contact part between the bracket base and the roof to fill the gap, realize secondary sealing and waterproof, and prevent rainwater from infiltrating into the roof from the installation gap. The adhesive tape is resistant to high temperature and aging, closely adheres to the roof substrate (colored steel, tiles and cement), and has long outdoor service life.
Cable laying insulation and fixing
When laying cables in power stations, use high-temperature adhesive tape to wind and fix the cables on the brackets to prevent the cables from swinging with the wind and being damaged by friction. At the same time, the adhesive tape has excellent insulation performance, which can isolate the metal joints of cables from brackets and components and avoid short circuit and leakage. Under outdoor high temperature (the surface temperature of photovoltaic module can reach 70~80℃ in summer), the adhesive tape does not soften or fall off, and the adhesive force is stable.
Installation gap filling and sand prevention
In the photovoltaic power station in the windy and sandy areas such as northwest and desert, high-temperature adhesive tape is used to fill the gaps between modules and between modules and brackets, so as to prevent wind and sand from entering the gaps and accumulating, and avoid affecting the heat dissipation and power generation efficiency of modules. At the same time, the adhesive tape is resistant to high temperature and ultraviolet rays, and will not be worn and aged by wind and sand.
IV. Operation and Maintenance/Repair of Photovoltaic Power Station
The core functions of routine maintenance and component repair of distribution stations are temporary sealing, local protection and repair positioning.
Component local repair protection
When photovoltaic modules are repaired outdoors (such as replacing junction box and repairing damaged backboard), the surface and glass of modules around the repaired area are covered with high-temperature adhesive tape to prevent the glue and solder from polluting the modules during repair. At the same time, the adhesive tape is resistant to high temperature, suitable for the local heating process during repair, and there is no deformation or residual glue after heating.
Temporary sealing of damaged components
When the back panel of the module is slightly damaged and the glass is slightly cracked, the high-temperature and waterproof high-temperature adhesive tape is used for temporary sealing repair, so as to prevent the damaged part from getting wet and entering dust, avoid the oxidation failure of the battery piece inside the module, and buy time for the subsequent professional repair. The adhesive tape can be temporarily used outdoors for 1-3 years, and the adhesive force and waterproof property are stable.
Repair insulation of operation and maintenance cable
During the operation and maintenance of the power station, if the cable skin is slightly damaged, high-temperature adhesive tape is used to wrap the damaged parts in layers to realize rapid insulation repair. The adhesive tape is resistant to high temperature and ultraviolet rays, and will not fall off due to high temperature and strong sunlight after outdoor repair. It can replace the traditional insulation tape and adapt to the high-temperature working conditions of photovoltaic power stations.
V. Production links of photovoltaic auxiliary materials
Adapting to the production of auxiliary materials such as photovoltaic supports, junction boxes and confluence boxes, the core functions are high-temperature processing protection, insulation sealing and positioning molding.
Spraying shielding of photovoltaic support
During the production of aluminum alloy photovoltaic bracket, high-temperature adhesive tape is used to cover the non-spraying areas such as threaded holes and connecting terminals of the bracket. The adhesive tape does not fall off or shrink when sprayed at high temperature (180~220℃), and the shielding edge is neat. After spraying, it is convenient to peel off and there is no residual adhesive, which ensures the normal use of threaded holes.
Insulation seal of junction box/junction box
During the production of photovoltaic junction box and junction box, the internal metal parts and terminals are pasted with high-temperature adhesive tape to realize insulation isolation and prevent short circuit in the box; At the same time, the adhesive tape can seal the gap in the box, prevent dust and water vapor from entering during production, and improve the protection level of auxiliary materials. The insulation performance of the adhesive tape is stable at high temperature, without aging and cracking.
Core adaptation requirements of high temperature adhesive tape in photovoltaic field (with extension)
The high-temperature adhesive tape for photovoltaic is not an ordinary industrial high-temperature adhesive tape, and it needs to meet the special standards for photovoltaic, and its characteristics directly determine the realization effect of the above functions:
High temperature resistance: long-term temperature resistance ≥150℃, short-term temperature resistance ≥200℃, suitable for component lamination and outdoor high temperature conditions;
No adhesive residue: no adhesive layer remains on the surface of the component and the bracket after peeling, so as to avoid affecting the photoelectric conversion efficiency of the component and the anticorrosion of the bracket;
Weather resistance: UV resistance, high humidity resistance, alternating high and low temperature resistance (-40℃~85℃), outdoor service life ≥10 years, matching the 25-year service life requirement of photovoltaic modules;
Insulation: volume resistivity ≥ 10Ω cm, dielectric strength ≥20kV/mm to avoid short circuit and leakage;
Environmental protection: halogen-free, formaldehyde-free, volatile organic compounds (VOC)-free, no harmful substances are released during lamination, so as to avoid polluting EVA film and preventing components from yellowing.
Core summary
High-temperature adhesive tape in photovoltaic field is the key auxiliary material of * * "ensuring production accuracy, firm installation and reliable operation and maintenance". From high-temperature processing of module production to outdoor weather resistance of power station installation, to rapid repair of later operation and maintenance, the whole process plays the core role of protection, fixation, insulation and sealing, and its performance needs to be highly matched with the requirements of high-temperature working conditions, outdoor weather resistance and long-term life of photovoltaic industry, which is to ensure the quality of photovoltaic modules and the stability of photovoltaic power stations.
