CN205645831U - Solar photovoltaic module - Google Patents

Abstract

The utility model relates to a can improve solar PV modules of photon utilization ratio and output includes a plurality of battery pieces and the photovoltaic backplate that glass layer, interval array arranged from top to bottom, be in the same place through EVA glued membrane link between a plurality of battery pieces that glass layer, interval array arranged and the photovoltaic backplate, the basal surface of photovoltaic backplate is equipped with one deck reflection insulating layer, the upper surface of reflection insulating layer is equipped with the storage tank to the position that corresponds each battery piece, be equipped with phosphor powder in the storage tank.

Description

A solar photovoltaic module

technical field

The utility model relates to the field of photovoltaic power generation, in particular to a solar photovoltaic module.

Background technique

Solar photovoltaic power generation system (referred to as photovoltaic) is a system that uses the photovoltaic effect to directly convert sunlight energy into electrical energy. The main component of its photoelectric conversion is a crystalline silicon photovoltaic cell. When the sun shines on the crystalline silicon photovoltaic cell, Crystalline silicon photovoltaic cells will convert the sun's light energy into electrical energy and generate electric current. At present, a photovoltaic module mainly includes a glass layer, a front layer of adhesive film, a number of cells arranged in a spaced array, a rear layer of adhesive film, and a photovoltaic backplane. Photovoltaic backsheets are glued together in turn. In order to improve the power generation efficiency of photovoltaic modules, it is necessary to reduce the reflection of sunlight on the surface of the modules, thereby increasing the irradiance of the modules and improving the photoelectric conversion efficiency of solar cells. In the prior art, the following methods are generally adopted: 1. Anti-reflection coated glass: use an anti-reflection coating on the surface of the glass to reduce the reflection of sunlight on the photovoltaic module and increase the absorption of light by the photovoltaic module, thereby increasing the power of the module and power generation; 2. Ultra-thin glass: reduce the thickness of the front glass of the module, thereby increasing the sunlight transmittance, reducing the refractive index of light, and enhancing the radiation intensity; the above method needs to change the structure of the photovoltaic module. Not applicable; changing the structure of photovoltaic modules will increase production costs, and since sunlight is composed of light of different wavelengths, different wavelengths have different photon energies, and only photon energies greater than the band gap of single-junction cell materials can be absorbed Then generate electricity, if the photon energy is less than the band gap of the single-junction cell material, it will pass through the material. For multi-junction series cells, because each cell is not infinitely thick, it is impossible to absorb all photon energy greater than single-junction. Part of the sunlight in the band gap of the battery will still pass through the battery to the backplane, which will affect the power generation efficiency of the photovoltaic module. At the same time, if the solar module is generally installed on the top of the building, it cannot provide good heat insulation. Effect.

Therefore, in order to further improve the power generation efficiency of photovoltaic modules, the utility model of Chinese Patent No. 201220404358.7 discloses a solar photovoltaic module, which includes a glass layer, a front layer of adhesive film, a number of cells arranged in a spaced array, a rear layer of adhesive film and a photovoltaic module. The back plate, the glass layer, the front layer of adhesive film, several battery sheets, the rear layer of adhesive film and the photovoltaic back plate are glued together in sequence. department. The solar photovoltaic module can improve photon utilization rate and output power. The mirror reflection part 51 is galvanized on the photovoltaic backplane 5 covered by the battery sheet 3 , and becomes the mirror reflection part 51 . The photovoltaic backplane of the off-voltage module includes a specular reflection part covered by the cells and a diffuse reflection part located in the gap between the cells. Therefore, the light enters from the glass layer, and the light incident on the cells is utilized and partially penetrates. The light from the battery sheet is reflected by the photovoltaic backplane and reused, thereby improving the power generation efficiency of the photovoltaic module, but the reflection effect of the specular reflection part formed only on the backplane 5 is not good, and it is located between the backplane and the back layer of glue. Between the films, the adhesive film of the rear layer tends to overflow to the front of the mirror reflection part, forming a partial shading, affecting the reflection effect of the mirror reflection part 51 and reducing the power generation efficiency.

Utility model content

In view of the above problems, the utility model proposes a solar photovoltaic module that can improve photon utilization rate and output power.

In order to solve this technical problem, the utility model adopts the following scheme: a solar photovoltaic module, which is characterized in that: from top to bottom, it includes a glass layer, a number of cells arranged in an array of intervals and a photovoltaic backplane, the glass layer, an array of intervals The arranged cells and the photovoltaic backplane are connected together by EVA adhesive film. The bottom surface of the photovoltaic backplane is provided with a layer of reflective heat insulation layer, and the upper surface of the reflective heat insulation layer corresponds to the position of each battery piece. An accommodating tank is provided, and fluorescent powder is arranged in the accommodating tank.

A further improvement is: a triangular reflective layer is provided between the adjacent battery sheets, and stripe grooves are provided on the surface of the triangular reflective layer.

By adopting the aforementioned technical solution, the beneficial effect of the utility model is that: the bottom surface of the photovoltaic backplane is provided with a layer of reflective heat insulation layer, and the bottom is provided with a reflective heat insulation layer, so that part of the light that penetrates the cells is captured by the photovoltaic backplane. The reflective heat insulation layer at the bottom of the board is reflected and reused to improve the photoelectric conversion efficiency, thereby improving the power generation efficiency of the photovoltaic module. The reflective heat insulation layer is directly coated on the bottom surface of the back plate, avoiding the overflow of the rear adhesive film to the mirror surface The front of the reflective layer forms partial shading and affects the reflection of the specular reflection part. The upper surface of the reflective heat insulation layer is provided with accommodating grooves corresponding to the positions of the battery sheets, and phosphor powder is arranged in the accommodating grooves, so that when the battery sheets absorb sunlight, the fluorescent powder can shoot on the surface of the battery sheets. The part of the solar spectrum larger than 1.2 microns on the solar cell is converted into a short-wavelength solar cell spectrum, so that the sunlight incident on the cell is fully utilized, broadening the range in which the cell absorbs sunlight can greatly improve the photoelectric conversion efficiency of the solar cell.

Description of drawings

Fig. 1 is a structural schematic diagram of Embodiment 1 of the utility model.

detailed description

The present invention will be further described in conjunction with the accompanying drawings and specific embodiments.

Embodiment one:

Referring to Fig. 1, this embodiment discloses a solar photovoltaic module, which includes a glass layer 1, several cells 2 arranged in a spaced array and a photovoltaic backplane 3 from top to bottom, the glass layer 1, several cells arranged in a spaced array 2 and the photovoltaic backplane 3 are bonded together by an EVA adhesive film 4. The bottom surface of the photovoltaic backplane 1 is provided with a layer of reflective heat insulation layer 5, and a reflective heat insulation layer is provided at the bottom, so that part of it penetrates the battery The light of the sheet is reflected by the reflective heat insulation layer at the bottom of the photovoltaic backplane and is reused to improve the photoelectric conversion efficiency, thereby improving the power generation efficiency of the photovoltaic module. The reflective heat insulation layer is directly coated on the bottom surface of the backplane, avoiding the back layer The phenomenon that the adhesive film overflows to the front of the specular reflection layer, forming partial occlusion, and affecting the reflection of the specular reflection part. The upper surface of the reflective heat-insulating layer 5 is provided with accommodating grooves corresponding to the positions of the cells 2, and phosphor powder 26 is glued in the accommodating grooves, so that when the cells absorb sunlight, the phosphor powder can The solar spectrum larger than 1.2 microns on the surface of the solar cell is converted into a short-wavelength solar cell spectrum, so that the sunlight incident on the solar cell is fully utilized, broadening the range of the solar cell to absorb sunlight, which can greatly improve the photoelectricity of the solar cell conversion efficiency. A triangular reflective layer is arranged between the adjacent battery sheets, and stripe grooves are arranged on the surface of the triangular reflective layer. The light incident between the gaps of the cells enters the cells through the reflection of the triangular reflective layer and the glass layer. In this way, the utilization of light is maximized, and the utilization rate of photons and the output power of photovoltaic modules are improved. The slots further increase light reflectivity.

The reflective heat insulation layer includes the following raw materials by weight: 20 parts by weight of organic silicon powder, 85 parts by weight of reflective powder, 30 parts by weight of fluorescent powder, 20 parts by weight of acrylic acid powder, and 15 parts by weight of polyvinyl alcohol phenolic modified phenolic resin , 35 parts by weight of borosilicate glass beads, 6 parts by weight of dispersant, 50 parts by weight of water, 150 parts by weight of elastic emulsion, and 10 parts by weight of auxiliary materials.

The reflective powder is composed of the following raw materials in parts by weight: 20 parts by weight of copper oxide powder, 30 parts by weight of silicon rubber, 85 parts by weight of titanium dioxide, 35 parts by weight of far-infrared ceramic powder, and 40 parts by weight of manganese dioxide.

The auxiliary materials include 2 parts by weight of propylene glycol, 5 parts by weight of a defoamer, 5 parts by weight of a thickener, 5 parts by weight of a rheological additive, 5 parts by weight of an antifungal agent, and 5 parts by weight of a film-forming aid.

The reflective heat insulation layer of the utility model adopts a specific formula, and borosilicate glass beads are added in the formula, which improves the heat reflectivity and radiation heat insulation effect, and has the effect of heat conduction barrier, reduces the thermal conductivity of the coating material, thereby To achieve the cooling effect of heat insulation, the solar module is installed on the top of the building, which can have a good heat insulation effect. At the same time, because the bonding effect of borosilicate glass beads and other raw materials is not good, the invention is still in the formula The addition of modified phenolic resin can improve the bonding force of each material and borosilicate glass beads, and improve the use effect. Phosphor powder is added to the formula, and the part larger than 1.2 microns on the surface of the cell can be further sprayed. The solar spectrum is converted into a short-wavelength solar cell spectrum, so that the sunlight incident on the cell is fully utilized, and the photoelectric conversion efficiency of the cell is further improved. Simultaneously, the present invention also adds elastic emulsion into the formula to further improve heat insulation and reflection effects, and enhance the adhesion of raw materials.

Embodiment two:

The structure of the solar photovoltaic module in this embodiment is the same as that of the previous embodiment, except that the reflective heat insulation layer includes the following raw materials in parts by weight: 25 parts by weight of organic silicon powder, 100 parts by weight of reflective powder, and 45 parts by weight of fluorescent powder , 25 parts by weight of acrylic acid powder, 20 parts by weight of modified phenolic resin, 40 parts by weight of borosilicate glass beads, 10 parts by weight of dispersant, 55 parts by weight of water, 200 parts by weight of elastic emulsion, and 15 parts by weight of auxiliary materials.

The reflective powder is composed of the following raw materials by weight: 35 parts by weight of copper oxide powder, 40 parts by weight of silicon rubber, 100 parts by weight of titanium dioxide, 45 parts by weight of far-infrared ceramic powder, and 55 parts by weight of manganese dioxide.

The auxiliary materials include 5 parts by weight of propylene glycol, 8 parts by weight of a defoamer, 8 parts by weight of a thickener, 10 parts by weight of a rheological additive, 10 parts by weight of an antifungal agent, and 10 parts by weight of a film-forming aid.

Embodiment 3: The structure of the solar photovoltaic module in this embodiment is the same as that of the previous embodiment, except that the reflective heat insulation layer includes the following raw materials in parts by weight: 23 parts by weight of organic silicon powder, 95 parts by weight of reflective powder, fluorescent Powder 38 parts by weight, acrylic acid powder 22 parts by weight, polyvinyl alcohol phenolic modified phenolic resin 18 parts, borosilicate glass beads 38 parts by weight, dispersant 8 parts by weight, water 52 parts by weight, elastic emulsion 180 parts, 12 parts by weight of auxiliary materials.

The reflective powder is composed of the following raw materials in parts by weight: 28 parts by weight of copper oxide powder, 35 parts by weight of silicon rubber, 90 parts by weight of titanium dioxide, 40 parts by weight of far-infrared ceramic powder, and 42 parts by weight of manganese dioxide.

The auxiliary materials include 3 parts by weight of propylene glycol, 7 parts by weight of a defoamer, 6 parts by weight of a thickener, 8 parts by weight of a rheological additive, 7 parts by weight of an antifungal agent, and 8 parts by weight of a film-forming aid.

The above records are only examples of using the technical content of this creation. Any modifications and changes made by those who are familiar with this technology using this creation belong to the scope of patents claimed by this creation, and are not limited to those disclosed in the examples.

Claims (2)

1. a solar photovoltaic assembly, it is characterized in that: from top to bottom include some cell pieces and photovoltaic back that glassy layer, spaced array arrange, linked together by EVA adhesive film between some cell pieces and photovoltaic back that described glassy layer, spaced array are arranged, the basal surface of described photovoltaic back is provided with one layer of reflective insulation layer, the position of the corresponding each cell piece of the upper surface of described reflective insulation layer is provided with storage tank, is provided with fluorescent material in described storage tank.

A kind of solar photovoltaic assembly the most according to claim 1, it is characterised in that: being provided with triangle reflecting layer between described adjacent cell sheet, the surface in described triangle reflecting layer is provided with bar groove.