Photovoltaic junction box copper-clad aluminum current-conducting plate and precision rolling compound method thereof

Abstract

The invention discloses a photovoltaic junction box copper-clad aluminum current-conducting plate and a precision rolling compound method thereof. Firstly, a three-layer pure copper-pure aluminum-pure copper composite plate is selected as a rolling base plate, wherein the thickness of the base plate is 2mm, the thickness after rolling is about 0.7mm, and the thickness ratio of a single-sided pure copper surface layer to a pure aluminum middle layer is 1 to 6. A precision rolling compound process comprises two steps of rolling at room temperature and diffusion annealing, and comprises the concrete steps of firstly precision-rolling the base plate to the required thickness at room temperature, wherein the rolling reduction ratio is 65 percent; then carrying out the diffusion-annealing for 1h at the temperature of 300 DEG C. Layers of a copper-clad aluminum sheet obtained through the invention are in metallurgical bonding in a sawtooth shape; the copper-clad aluminum sheet has both excellent electrical conductivity and less proportion of copper, so that the copper-clad aluminum sheet meets the comprehensive performance requirement of the photovoltaic junction box current-conducting plate, furthermore, the bending resistance is high, and the bonding strength between the composite plates is improved. Since the volume percentage of the aluminum replacing the copper reaches up to 75 percent, the cost of the current-conducting plate is remarkably reduced.

Description

technical field [0001] The invention belongs to the technical field of material processing, and in particular relates to a copper-clad aluminum conductive plate of a photovoltaic junction box and a finishing rolling compounding method thereof. Background technique [0002] Since solar energy is a kind of green renewable energy, the solar cell technology that uses the photovoltaic effect to generate electricity has attracted worldwide attention. Photovoltaic junction box, as the most basic electrical energy extraction component, is a key component of photovoltaic modules to build power generation systems. At present, most photovoltaic junction boxes for solar energy in the market use copper plates as conductors. Copper is a precious and rare metal, and the lack of resources leads to high costs. Both aluminum and copper are common conductive materials. Although the electrical and thermal conductivity of aluminum is not as good as that of copper, its density is only 1 / 3 of tha...

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Problems solved by technology

[0004] The traditional copper-aluminum composite panel is mainly produced by explosive composite method. The composite interface is well bonded, but the degree of mechanization is low, the quality is unstable, the yield is low, the production cost is high, and continuous large-area composite cannot be performed.

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