Back-contact solar cell module and manufacturing method thereof

Abstract

A back-contact solar cell assembly and a manufacturing method therefor. A front side of each solar cell (3) is adhered to an EVA layer (2), and the EVA layer (2) is inversely disposed on the solar cells to make the back side of the EVA layer (2) to face down. Multiple conductive bands (5) are fixed to an insulation film layer (6) according to a preset shape, so that the conductive bands (5) form a whole body, and the conductive bands (5) are soldered to the back sides of the solar cells (3). Because the solar cells (3) are located above the conductive bands (5), solder melted under heat does not drop to gate lines under the effect of the gravity, so that the short circuit of the gate lines is avoided, thereby improving the yield of the solar cell assembly. In addition, in the soldering process, it is only required to melt all of the solder one time by using infrared reflow soldering, that is, it is unnecessary to carry out soldering multiple times, and the displacement of the conductive bands does not occur.

Description

technical field [0001] The invention relates to a back-contact solar battery module and a manufacturing method thereof. Background technique [0002] At present, solar cell components are generally composed of tempered glass, EVA layer, solar cells and conductive tape. The tempered glass provides protection for solar cell components. The EVA layer is used to bond and fix multiple solar cells. Solar cells directly To convert light energy into electrical energy, the conductive strip establishes an electrical connection between any two solar cells. Among them, the power generation principle of solar cells is: sunlight shines on the semiconductor P-N junction to form new hole-electron pairs. Under the action of the built-in electric field of the P-N junction, the photo-generated holes flow to the P region, and the photo-generated electrons flow to the N region. At this time, the photo-generated holes are collected by the positive grid line, and the photo-generated electrons are...

AI Technical Summary

Problems solved by technology

However, in this solution, since the grid lines are all concentrated on the back side of the solar cell, the grid lines on the back side are too dense. When workers weld the conductive strip 5 to the grid lines according to the method, the solder will easily drip onto the grid lines, resulting in The grid wire is short-circuited and the solar cells are damaged

Especially when the number of conductive strips 5 is too large, the risk of solder dripping is higher, which reduces the yield of solar cell modules, and because the conductive strips 5 are discrete from each other, when welding the conductive strips 5, one is needed. Welding one by one, the welding is very troublesome, which makes it difficult to weld the solar cell module as a whole

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