Plug-in outer-lead photovoltaic module junction box and solar photovoltaic module string

Abstract

A plug-in outer-lead photovoltaic assembly junction box and a solar photovoltaic assembly string. The junction box comprises a junction box body (2) with a built-in wiring line (1), and a connection wire (3). Each of two ends of the connection wire (3) is separately provided with a plug (4). The junction box body (2) is provided with a negative electrode socket (5) connected to the negative electrode of the wiring line (1) and a positive electrode socket (6) connected to the positive electrode of the wiring line (1). The connection wire (3) is detachably plugged in the negative electrode socket (5) or the positive electrode socket (6) by means of the plugs (4). The solar photovoltaic assembly string comprises a plurality of photovoltaic assemblies (7), and each of the photovoltaic assemblies (7) is provided with a junction box, and the junction box is the foregoing plug-in outer-lead photovoltaic assembly junction box. The length of the wire can be effectively reduced, electric energy loss due to the excessive length of the wire is reduced, the system efficiency of the photovoltaic power station is improved, connection among assemblies is simplified, wire connection points can be reduced, contact resistance is reduced, and hidden fault points can be reduced.

Description

Technical field [0001] The invention relates to the technical field of electrical component design, in particular to a plug-in type outer lead photovoltaic component junction box and a solar photovoltaic component string. Background technique [0002] At present, the existing photovoltaic module junction boxes all use outer leads to lead directly from the inside of the junction box, and a wire plug is installed at the other end of the outer leads to facilitate connection with another photovoltaic module to form a solar photovoltaic module string. Such as figure 1 As shown, the existing photovoltaic module junction box is mainly integrated by the following components: a junction box body with a built-in wiring line 1, two outer leads 30, two about 1 m long that are respectively connected to the positive and negative poles of the wiring line. There are two positive and negative wire connection plugs 40, two sealed fastening caps 50 wrapped around the lead outlet of the junction box...

AI Technical Summary

Problems solved by technology

[0004] (1) Question 1: In large-scale photovoltaic power plants, photovoltaic modules are connected in series, that is, the negative pole of the junction box of one module is connected with the positive pole of the junction box of another module in turn, usually 20 to 22 modules form a photovoltaic string unit

Based on the calculation of a 10MW photovoltaic power station, a total of 40,000 modules are installed, and the total length of the external leads of the existing junction box is about 80km. The required lead length is relatively long, and it also causes power loss on the line

[0005] (2) Question 2: Each photovoltaic module has two positive and negative wire connectors 40. Taking a 10MW photovoltaic power station as an example, 40,000 modules are installed, and there are a total of 80,000 wire connectors (40,000 pairs)

Each mating plug has 3 connection points (between the wire and the female plug, between the wire and the male plug, and between the male and female plugs) to form contact resistance to generate power loss and hidden trouble points

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