What is the reasons for solar cell packaging?
In practical applications, solar cells need to be processed into photovoltaic modules that can be used outdoors for a long time through a specific packaging process before they can be used. In addition to ensuring that the solar cell module has a certain mechanical strength, the package also has the functions of insulation, moisture resistance, and weather resistance. The reasons for solar cell packaging are as follows:
(1) From the perspective of mechanics, crystalline silicon cells must be packaged to ensure good mechanical strength. Silicon wafer is a brittle material. The thickness of the wafer used in crystalline silicon solar cell is generally about 180um, which is very easy to break. Through packaging, the solar cell can have good mechanical strength and reduce the impact of ice buds, wind and machinery. The influence of vibration, etc.;
(2) Improve the ability of crystalline silicon solar cell to resist external environmental erosion. The upper surface of the solar cell has metal electrodes, anti-reflection film, and the lower surface also has metal electrodes. These materials are easily exposed to outdoor air for a long time and are easily corroded by the environment, leading to oxidation and damage, and ultimately causing battery failure, so they must be sealed;
(3) Improve the safety of photovoltaic modules. The current generated by monolithic crystalline silicon solar cell is very large, but the voltage is very low, only about 0.6V, which cannot directly meet the requirements of the load. It is necessary to connect multiple cells in series or parallel to achieve the required electrical performance requirements. These series Or if the batteries connected in parallel are put together without packaging, dangerous accidents such as electric leakage and electric shock will easily occur during use;
(4) It is easy to transport, install and maintain, and different packaging structures can also provide diversified applications. In addition, in order to ensure the reliability of long-term use, the packaged photovoltaic modules must undergo a series of strict electrical performance and safety performance tests. International and domestic product standards and testing standards for crystalline silicon solar cell modules have been formulated, including IEC61215-1/2, IEC61730-1/2 and UL1703. In response to some problems in application development, related technical standards are constantly being revised and adjusted.
What is the development history of photovoltaic modules? You can learn more about solar modules.