Junction box for photovoltaic systems

Abstract

The invention relates to a junction box for photovoltaic systems, which includes a box body, a box cover and a diode component. The box body is internally provided with wiring terminals. The diode component includes a plastic part, plug inside metal conductors provided with plugs, and diodes. After being welded to the plug inside metal conductors, the diodes are wrapped inside the plastic part during injection molding of the plastic part. The plugs extend out of the plastic part. Sockets matching the plugs are arranged in a side of the box body. Each socket is internally provided with a socketinside metal wire connected between adjacent wiring terminals. A sealing ring is arranged at the joint of each plug and the corresponding socket. The diode component and the box body are connected ina plugging mode, so that the diodes are connected with two adjacent wiring terminals to offer bypass protection to a photovoltaic system. Once the diodes are damaged, there is only need to directly remove the damaged diode component and replace the damaged diode component with a new diode component, and then, the junction box can work normally. The purposes of quick replacement and maintenance cost reduction are achieved.

Description

technical field [0001] The invention relates to the technical field of photovoltaic systems, in particular to a junction box used in photovoltaic systems. Background technique [0002] In existing photovoltaic systems, a traditional junction box containing single or multiple diodes is usually used as a bypass protection device for photovoltaic modules to protect photovoltaic modules from overheating or even fire in some cases. The diodes are generally fixed on the internal circuit board of the junction box by welding. Therefore, to replace the failed diode, it is necessary to cut the welding point of the diode again, remove the failed diode, and re-solder the normal diode. The operation process It is relatively cumbersome. Although diodes account for a very low proportion of the cost of photovoltaic modules, generally not higher than 1%, a considerable part of the failure of photovoltaic systems is caused by the failure of diodes. In addition, because the photovoltaic syste...

AI Technical Summary

Problems solved by technology

The diodes are generally fixed on the internal circuit board of the junction box by welding. Therefore, to replace the failed diodes, it is necessary to re-cut the welding points of the diodes, remove the failed diodes, and re-solder the normal diodes. The operation process It is more cumbersome. Although diodes account for a very low proportion of the cost of photovoltaic modules, generally not higher than 1%, a considerable part of the failure of photovoltaic systems is caused by the failure of diodes.

In addition, because the photovoltaic system is generally installed in the field, it is not easy to construct on site, and the cost of directly replacing the diode inside the junction box is very high

Moreover, most junction boxes currently use potting technology, and the diodes are completely covered by silica gel. The actual situation is that it is difficult to replace the diodes.

[0003] At present, if the junction box with a diode failure in the photovoltaic module is directly replaced with a normal photovoltaic module, and considering the transportation cost of the module, this will cause the maintenance cost of the photovoltaic system to be far greater than the value of the failed diode

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