Solar photovoltaic junction box

Abstract

The invention discloses a solar photovoltaic junction box, which comprises a box body, a bypass diode and a control circuit, wherein the box body is internally provided with a main cavity chamber and an auxiliary cavity chamber sealed and isolated by multiple separators; at least one separator is a heat-conducting plate; the bypass diode is arranged on the heat-conducting plate located at the side of the main cavity chamber and conducts heat to the auxiliary cavity chamber via the heat-conducting plate; the control circuit is located in the main cavity chamber; and the auxiliary cavity chamber is provided with an air inlet and an air outlet passing through the box body and connected with the outer part of the box body, and a cooling air duct is formed. The solar photovoltaic junction box of the invention has the advantages of simple structure, good cooling effects, high protection level and the like.

Description

technical field [0001] The invention mainly relates to the technical field of solar power generation, in particular to a solar photovoltaic junction box. Background technique [0002] As an important part of the solar cell module, the photovoltaic junction box is a connecting part between the solar cell array formed by the solar cell module and the solar cell charge controller. As a connector of solar cell modules, the main function of the solar photovoltaic junction box is to export the electric energy generated by the solar cell module through the cable, and to protect the lead wires of the components from the external environment. [0003] There are copper-based busbars, terminal blocks, bypass diodes and other metal parts in the photovoltaic junction box, and the metal parts will generate heat during operation. In order to prevent the electrical conductors from short circuiting each other, photovoltaic modules are filled with sealant (a kind of room-temperature-cured se...

AI Technical Summary

Problems solved by technology

The photovoltaic junction box is bonded to the back of the solar photovoltaic module. During operation, heat will be generated inside the photovoltaic junction box. The bypass diode is the main heating element. The main heat dissipation structure relies on the metal feet of the bypass diode for heat conduction and heat dissipation. Sealant, air layer, and box body conduct heat dissipation, and the heat dissipation effect is not good. The main reason is that the air layer between the lower surface of the box cover and the potting glue affects heat dissipation, thereby reducing the reliability of circuit operation, and in serious cases, the photovoltaic junction box is burned.

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