Solar cell modules, also called solar panels and photovoltaic modules, are the core part of the solar power generation system and the most important part of the solar power generation system. Its function is to convert solar energy into electrical energy, or send it to the battery for storage, or promote load work.
Solar cell modules are composed of high-efficiency monocrystalline or polycrystalline solar cells, low-iron ultra-white suede tempered glass, packaging materials (EVA, POE, etc.), functional backplanes, interconnecting bars, bus bars, junction boxes and aluminum alloy frames. .
The principle of solar cells
The energy converter of solar photovoltaic power generation is a solar cell, also known as a photovoltaic cell. The principle of solar cell power generation is the photovoltaic effect. When sunlight shines on the solar cell, the cell absorbs light energy and generates photogenerated electron-hole pairs. Under the action of the built-in electric field of the battery, the photogenerated electrons and holes are separated, and the accumulation of opposite-signal charges occurs at both ends of the battery, that is, a "photogenerated voltage" is generated, which is the "photovoltaic effect". If the electrodes are drawn on both sides of the built-in electric field and the load is connected, the load will have a "photo-generated current" flowing through, thereby obtaining power output. In this way, the light energy of the sun is directly converted into electricity that can be used.
At the same temperature, the effect of light intensity on the solar panel: the greater the light intensity, the greater the open-circuit voltage and short-circuit current of the solar panel, and the greater the maximum output power. At the same time, it can be seen that the open-circuit voltage changes with the irradiation intensity. Not as obvious as the change of short-circuit current with irradiation intensity.
Under the same light intensity, the effect of temperature on the panel: when the temperature of the solar cell increases, the output open-circuit voltage decreases significantly with the temperature, and the short-circuit current increases slightly, and the general trend is that the maximum output power decreases
Features of solar cells
The solar cell module has high photoelectric conversion efficiency and high reliability; advanced diffusion technology ensures the uniformity of conversion efficiency throughout the chip; ensures good electrical conductivity, reliable adhesion and good electrode solderability; high precision The silk-screen printed graphics and high flatness make the battery easy for automatic welding and laser cutting.
According to the different materials used, solar cells can be divided into: silicon solar cells, multi-compound thin film solar cells, polymer multilayer modified electrode solar cells, nanocrystalline solar cells, organic solar cells, plastic solar cells, among which silicon solar cells Batteries are the most mature and dominate the application.
Post time: Dec-30-2022