Photovoltaic cell assembly with two glass layers

Abstract

A dual-glass photovoltaic cell module, comprising: a body (1), said body (1) comprising a first glass layer (11), a first encapsulation layer (12), a cell group layer (13), a second encapsulation layer (14), and a second glass layer (15) arranged in a sequential stack, the outer edges of the first glass layer (11) and the second glass layer (15) extending past the outer edges of the cell group layer (13); a layer of reflective coating being disposed on the second glass layer (15); an end sealing block, said end sealing block being arranged between the first glass layer (11) and the second glass layer (15) at the outer periphery of the first encapsulation layer (12), the cell group layer (13), and the second encapsulation layer (14); a rim (6) encapsulating the outer perimeter of the body (1), said rim (6) having a notch (60); and a junction box (4) being disposed at the notch (60).

Description

technical field [0001] The invention relates to the field of solar cells, in particular to a double-glass photovoltaic cell assembly. Background technique [0002] Existing double-glass modules use tempered glass as the back sheet, high UV transmittance EVA or PVB on the front, and white EVA or PVB on the back layer of EVA. The disadvantages of this component are as follows: [0003] First, the back of the double-glass module uses air-tight and water-impermeable glass, which can prevent water vapor from entering the module, but the gap between the edges of the two pieces of glass is still a weak link, and water vapor can still enter the module through the packaging film, and Due to the sealing effect of glass, it is difficult to diffuse out. Under the action of ultraviolet rays, the small molecules of acetic acid produced by the decomposition of the EVA packaging film will still corrode the battery sheet and reduce the life of the component. If it is PVB encapsulation, th...

AI Technical Summary

Problems solved by technology

If it is PVB package, the problem will be more serious due to the high water absorption of PVB

[0004] Second, the problem with using white EVA or PVB on the back is that the white part is likely to spread to the front of the cell after long-term use, forming a shield on the cell, causing hot spots, and affecting the efficiency of the module

[0005] Third, there is a safety hazard in the absence of a frame on the edge of the module, because the most vulnerable part of the tempered glass is the edge and four corners, if not properly protected, it is easy to cause the module to break

However, since the structure of the reflective layer is isosceles trapezoidal, when the upper bottom surface is irradiated by sunlight, the light will be directly reflected, and this part of the light will not be utilized, thus affecting the photoelectric conversion efficiency.

On the other hand, since the reflective layer has a trapezoidal structure, during the lamination process, the corners of the trapezoid will inevitably cause damage to the encapsulation film and the edge of the cell, thereby reducing the life of the entire solar cell module.

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