Junction boxes for solar systems

Abstract

The invention discloses a junction box for a solar energy system, comprising a shell and an upper cover, at least two wiring devices are arranged in the shell, and the adjacent wiring devices are electrically connected by a diode, the inner surface of an upper cover is provided with an inner arc surface which is attached to the outer surface of the upper side of the diode after the upper cover is buckled to the shell, the wiring device comprises a wiring base, and a metal connecting piece, a folding spring and a rolling spring which are arranged on the wiring base, an electric conduction tin belt of a solar panel is arranged between the metal connecting piece and the folding spring and can be compressed by elastic force of the folding spring, the side surface of the metal connecting piece is provided with an external-convex arc surface which leads a diode foot to be inserted, and can be compressed by the rolling spring, and the metal connecting piece is arranged at the output end of the wiring device and is provided with a cylinder hole which leads an external wiring contact pin to be inserted. The junction box has good heat radiation performance, high electric conductivity and reliable work, heat generated by the diode can be directly transmitted to an aluminium alloy upper cover with good thermal conductivity, and conductors are contacted by planes or cylindrical surfaces, so as to improve the contact area.

Description

technical field [0001] The invention relates to a junction assembly for a solar power generation system, in particular to a junction box for a solar power system. Background technique [0002] At present, the shell materials of junction boxes used in solar power generation systems on the market are generally made of engineering plastics, and the connection between conductors is mainly fixed by contacts. The junction boxes with this structure generally have the following defects: First, the junction box In the working state, the diode inside the shell will generate a lot of heat energy, the heat will be transferred to the shell through the air conduction and convection in the shell, and then the shell will release the heat through conduction, but due to the poor thermal conductivity of air and plastic, the inside of the shell The heat cannot be released in time, which causes the temperature inside the housing to rise continuously, which makes the diode work at high temperatur...

AI Technical Summary

Problems solved by technology

[0002] At present, the shell materials of junction boxes used in solar power generation systems on the market are generally made of engineering plastics, and the connection between conductors is mainly fixed by contacts. The junction boxes with this structure generally have the following defects: First, the junction box In the working state, the diode inside the shell will generate a lot of heat energy, the heat will be transferred to the shell through the air conduction and convection in the shell, and then the shell will release the heat through conduction, but due to the poor thermal conductivity of air and plastic, the inside of the shell The heat cannot be released in time, which causes the temperature inside the housing to rise continuously, which makes the diode work at high temperature for a long time and reduces the service life. service life; secondly, shrapnel and protruding point contact are commonly used in the contact parts between conductor connections. This structure makes the contact form between conductors point contact, and the contact area is too small, which increases the resistance and reduces the product's power consumption. The transmission efficiency; finally, for high-power junction boxes, the metal parts used for conducting electricity in the shell are exposed and the distance between the metal parts is small, which is easy to cause discharge between components, damage the diode and reduce the reliability of the product

Images