CN205303479U

CN205303479U - Increase photovoltaic backplate of photovoltaic module light absorption rate

Info

Publication number: CN205303479U
Application number: CN201521000154.7U
Authority: CN
Inventors: 李奎; 李陶; 谢伟; 朱生宾; 崔廷
Original assignee: HEFEI JA SOLAR TECHNOLOGY Co Ltd
Current assignee: HEFEI JA SOLAR TECHNOLOGY Co Ltd
Priority date: 2015-12-07
Filing date: 2015-12-07
Publication date: 2016-06-08
Anticipated expiration: 2025-12-07

Abstract

The utility model discloses an increase photovoltaic backplate of photovoltaic module light absorption rate, including upper strata 1, middle level 2 and lower floor 3, upper strata 1 and middle level 2 middle level 2 and lower floor bond its characterized in that through tie coat 4 between 3: upper strata 1 and the upper surface in middle level 2 have protruding structure 5, the cross section of protruding structure 5 be isosceles triangle or approximate isosceles triangle. It can reduce the incident light degree in the air that is reflected this photovoltaic backplate, increases the absorption rate that photovoltaic module set a camera, and then improves photovoltaic module's power.

Description

A kind of photovoltaic back increasing photovoltaic module absorptivity

Technical field

This utility model relates to a kind of photovoltaic module, particularly relates to the photovoltaic back of a kind of photovoltaic module.

Background technology

Photovoltaic back is positioned at the back side of solar panel, cell piece rises protection and supporting role, has reliable insulating properties, water preventing ability and resistance to ag(e)ing. At present, conventional photovoltaic back is as it is shown in figure 1, generally have three-decker. Upper strata more than 1 uses fluorine material, such as PVF, PVDF etc., or uses not fluorine-containing EVA material to make; Middle level 2 uses PET material to make; Lower floor more than 3 uses the fluorine materials such as PVF, PVDF, PTFE to make. It is respectively arranged with one layer of tack coat 4 between upper strata and middle level, middle level and lower floor, each layer is bonded together, form smooth overall structure.

Owing to the surface of photovoltaic back is planar structure, the vertical incident illumination of major part or low-angle incident illumination can be reflexed in air again by backboard, it is impossible to enough well absorbed by cell piece, be unfavorable for the photovoltaic module absorption to light.

Utility model content

The purpose of this utility model is in that to provide a kind of photovoltaic back increasing photovoltaic module absorptivity, and it can reduce the degree that incident illumination is reflected in air, increases the photovoltaic module absorbance to light, and then improves the power of photovoltaic module.

A kind of photovoltaic back increasing photovoltaic module absorptivity, including the upper, middle and lower, described upper strata and middle level, bondd by tack coat between described middle level and lower floor, it is characterized in that: described upper strata and the upper surface in middle level have raised structures, the cross section of described raised structures is isosceles triangle or approximate isosceles triangle.

" approximate isosceles triangle " as herein described means any three summits that have, and equal structure is distinguished to the air line distance between two other summits in one of them summit. In the raised structures that cross section of the present utility model is approximate isosceles triangle, the peak of its projection is equal to the air line distance between two other summit, and line between is two identical camber lines, for instance evagination camber line or indent camber line.

When incident ray is radiated at the surface of isosceles triangular structure or approximate isosceles triangular structure, it can be reflected back component internal at an angle, the light being reflected back component internal can be reflected back component internal again in glass/air interface, and there have part to be again incident on battery to be unilateral, and be converted to electric energy by absorption.

Preferably, the corner angle of described isosceles triangle or approximate isosceles triangle is more than or equal to 90 ��, and less than or equal to 138 ��.

In this utility model, the drift angle of isosceles triangle or approximate isosceles triangle means the angle between two straight line connecting lines between the peak of raised structures and two other point of triangle. Being computed, when drift angle is more than or equal to 90 ��, and during less than or equal to 138 ��, the assimilation effect that backboard is reflected light by cell piece is best.

The beneficial effects of the utility model are: effectively by the inside of incident illumination reflected light photovoltaic assembly again, can reduce incident illumination and be reflected to the degree in air, increase the photovoltaic module absorbance to light, and then increase the power of photovoltaic module.

Accompanying drawing explanation

Fig. 1 is the structure chart of existing photovoltaic back;

Fig. 2 is the light line reflection schematic diagram of existing photovoltaic module

Fig. 3 is the photovoltaic back structure chart of embodiment 1 of the present utility model;

Fig. 4 is the light line reflection schematic diagram of the photovoltaic module of the photovoltaic back using embodiment 1;

Fig. 5 is the photovoltaic back structure chart of second embodiment of the present utility model.

Accompanying drawing labelling: 1-upper strata; 2-middle level; 3-lower floor; 4-tack coat; 5-raised structures; 6-glass; 7-EVA1; 8-EVA2; 9-photovoltaic back; 10-battery.

Detailed description of the invention

Embodiment 1

As shown in Figure 3, the photovoltaic back of the present embodiment includes upper, middle and lower-ranking structure, bondd by tack coat 4 between upper strata 1 and middle level 2, middle level 2 and lower floor 3, the upper strata of this backboard and the upper surface in middle level have raised structures 5, the cross section of this raised structures 5 is isosceles triangle, and the drift angle of this triangle is 138 ��.

When making this photovoltaic back, first the upper surface in middle level 2 is being fabricated to the structure with prominent triangle, then by upper strata 1 by tack coat 2, is holding tightly together with surface, middle level.

Upper strata 1 use fluorine material or not fluorine material make; Middle level 2 uses PET material to make; Lower floor 3 uses fluorine material to make.

Fig. 4 illustrates the light line reflection schematic diagram of the photovoltaic module of the photovoltaic back of application the present embodiment. Being calculated by theoretical modeling, the absorption of light is increased about 0.8% by the new more conventional assembly of back board structure assembly, corresponding component power increase about 0.8%.

Embodiment 2

As shown in Figure 5, the present embodiment photovoltaic back includes upper, middle and lower-ranking structure, bondd by tack coat 4 between upper strata 1 and middle level 2, middle level 2 and lower floor 3, the upper strata of this backboard and the upper surface in middle level have raised structures 5, the cross section of this raised structures 5 is approximate isosceles triangle, and a summit of this approximate isosceles triangle is two identical indent camber lines between two other summit; This subtriangular drift angle is 90 ��.

When making this photovoltaic back, first there is prominent subtriangular structure being fabricated to by the upper surface in middle level 2, then by upper strata 1 by tack coat 2, hold tightly together with surface, middle level.

Claims

1. the photovoltaic back increasing photovoltaic module absorptivity, including upper strata (1), middle level (2) and lower floor (3), described upper strata (1) and middle level (2), between described middle level (2) and lower floor (3) by tack coat (4) bonding, it is characterized in that: described upper strata (1) and the upper surface of middle level (2) have raised structures (5), and the cross section of described raised structures (5) is isosceles triangle or approximate isosceles triangle.

2. the photovoltaic back of increase photovoltaic module absorptivity according to claim 1, it is characterized in that: the raised structures that described cross section is isosceles triangle refers to any three summits that have, and equal structure is distinguished to the air line distance between two other summits in one of them summit.

3. the photovoltaic back of increase photovoltaic module absorptivity according to claim 1, it is characterized in that: the raised structures that described cross section is approximate isosceles triangle refers to that the peak of its projection is equal to the air line distance between two other summit, and line between is two identical camber lines.

4. the photovoltaic back increasing photovoltaic module absorptivity according to Claims 2 or 3, it is characterised in that: the corner angle of described isosceles triangle or approximate isosceles triangle is more than or equal to 90 ��, and less than or equal to 138 ��.

5. the photovoltaic back of increase photovoltaic module absorptivity according to claim 4, it is characterised in that: described upper strata (1) use fluorine material or not fluorine material are made; Middle level (2) uses PET material to make; Lower floor (3) uses fluorine material to make.