Design of flexible photoelectric module

FIELD: power engineering.

SUBSTANCE: design of a flexible photoelectric module represents the following serially arranged components: a lower bearing film, a lower reinforcing layer, a lower fastening film, electrically connected solar elements, an upper fastening film, an upper reinforcing layer and an upper bearing film. The lower and upper bearing and fastening films are made of material, which is transparent for sun light. Reinforcing layers are perforated films from anti-adhesive material, which are transparent for sun light, or which are coated with a layer of an anti-adhesive material, where perforation is arranged in the form of regularly arranged holes.

EFFECT: provision of reversible deformation of a photoelectric module plane simultaneously in two and more directions.

3 dwg

 

The invention relates to the field of solar energy, in particular to a flexible photovoltaic modules, which, in addition to basic functions (generation photoelectrically), can additionally be used as elements of industrial and construction design, undergoing elastic deformation in the longitudinal and (or) transverse direction (torsion or bending).

Such structural elements, in particular, may include:

- rapidly deployable portable power supply system when the rescue and recovery operations;

- available on the roofs of cars or trains system additional power supply;

modules that serve as the roofs of individual objects (stops vehicles, placards, telephone booths, etc) and provide for Autonomous power supply of the object;

modules in the form of elastic roofing materials and slabs and curtain walls-partitions for facade work.

For the application of photovoltaic modules as such you must ensure on the one hand sufficient design flexibility (in order to fit into the overall structural design), on the other hand - it is necessary to provide sufficient rigidity capable of resisting distributed (vetrovi is) or concentrated loads (for example, kick ice than hailstones or accidental pressing arm)attached to the photovoltaic module. In addition, the PV module should be as light as possible.

Known for the design of flexible photovoltaic module, consisting of a flexible polymeric substrate, on which is formed a layer of amorphous silicon by the method of deposition from the gas phase [1].

This design can have high flexibility (almost up to 100%) when using as the basis of a thin polymer film.

The simplicity and low cost of production makes the modules made of amorphous silicon demand in the widest spheres of human activity, but their efficiency is 8-11%, which is considerably lower than the efficiency for modules based on monocrystalline silicon, which reaches 30%.

In addition, the modules made of amorphous silicon are less durable due to the significant degradation of the electrical properties of amorphous silicon with prolonged exposure to sunlight.

Also known for the design of flexible photovoltaic module, providing for placement on the surface of the flexible mesh membrane frame of the solar cells are switched to each other with metal tires and covered with front and back sides of the protective glass plates [2].

The disadvantage of this design is the construction is the inability to ensure the regularity of the deformable plane module (deform a mesh membrane, while each part of a module of solar cells of strain is not exposed: the only change is the spatial arrangement of the elements relative to each other).

Known for the design of flexible photovoltaic module representing a single structure closely spaced interconnected solar cells on a flexible basis of synthetic material ("Capito"), in which solar cells are connected with the base by curing the polymer adhesive layer, which contains metal particles, providing an effective connection of solar cells in a single electrical circuit [3].

The disadvantage of this design is its lack of rigidity. The flexible photovoltaic module is provided primarily by the possibility of elastic deformation of its Foundation. When small thickness of the base layer of the photovoltaic module has a low rigidity, which in some cases is unacceptable.

Increasing the rigidity of the module is possible only by increasing the thickness of the Foundation, and this leads to an increase in the weight of the PV module, which is an unacceptable solution.

The closest in technical essence and the achieved result is a flexible photovoltaic module comprising a transparent to sunlight the top of the YOYO and the lower carrier film, located between the bearing films of electrically interconnected solar cells, sealed bearing films are transparent to sunlight of the upper and lower fastening tapes containing reinforcing layers in a grid of high-strength synthetic yarn, transparent to sunlight and impregnated substance (or containing such a substance with a low coefficient of absorption and scattering of light [4].

Design flexible photovoltaic module is illustrated by figure 1, where:

1 and 7, the upper and lower carrier films, respectively;

2 and 6 the upper and lower fastening film, respectively;

3 and 5 the upper and lower reinforcing layers (grids of high-strength artificial fibres), respectively;

4 - solar elements.

Maximum compensation of elastic deformation of the plane of the flexible photovoltaic module at the expense put into its design grid 3 and 5 of the transparent high-strength fibers is provided at the location of the threads parallel to the plane of the flexible photovoltaic module.

If high-strength synthetic yarn to Orient in the direction of the vector of the internal voltage of the intended bend flexible photovoltaic module, thereby it is possible to additionally increase the stability of the flexible photovoltaic module to deforming tension is eniam, occur when specific conditions.

If flexible photovoltaic module is used in the form of curved in the longitudinal and transverse direction of the elastically deformed structure (placing it on slozhnoprofilnyh surfaces, such as on the bumper of the vehicle, the elements of rigging boats or yachts and the like), the optimal location of high-strength synthetic yarns in this case is the diagonal-cross.

In order to additionally put into the design of flexible photovoltaic module grid of high-strength artificial fibres, not made its electrophysical parameters of high-strength synthetic yarn impregnated with a substance having a low coefficient of absorption and scattering of light (e.g., silicone fluid which is a mixture of polysiloxane containing dimethyl - or (and) Diethylenetriamine links, platinum catalyst and a crosslinking agent).

One of the variants of a design grid of a high-strength synthetic fibres, impregnated with a substance having a low coefficient of absorption and scattering of light is the net, where as artificial fibres are filaments from a material with a low coefficient of absorption and scattering of light.

The thickness of the upper 1 and lower bearing 7 films ~0, mm. The thickness of the upper 2 and lower 6 binds the film together with put them in grids 3 and 5 of the high-strength synthetic yarn is of ~0.3 mm, the thickness of the silicon monocrystalline solar cells 4 100÷250 μm. The total thickness of the flexible photovoltaic module is ~1,4÷1,5 mm While the maximum possible radius of curvature under the action of bending stresses, which is not yet the destruction of silicon solar cells is ~25÷30 cm

The specified flexible photovoltaic module can be subjected to elastic deformation in only one (longitudinal, transverse or diagonal direction, the radius of curvature of the module is approximately equal respectively to the length or width of the flexible photovoltaic module when the bending stresses applied respectively to opposite edges of the length or width of the module.

The disadvantage of this design is the inability of the elastic deformation of the flexible plane module simultaneously in several directions without mechanical destruction of the solar cell module.

The objective of the invention is the provision of a reversible (elastic) deformation of the plane of the PV module at the same time in two or more directions.

This is due to the fact that in the construction of the photoelectric flexible what about the module, representing successively located lower carrier film, the lower reinforcing layer, the lower fastening tape, electrically interconnected solar cells, the upper fastening tape, the upper reinforcing layer and the upper carrier film, and the upper and lower bearing and fastening tapes are made from transparent to solar light material as a reinforcing layer using transparent to sunlight perforated film of anti-adhesive material or covered with a layer of anti-adhesive material, the perforations in which are made in the form of regularly spaced holes.

The design of the inventive flexible photovoltaic module is explained in figure 2, where:

1 and 7, the upper and lower carrier films, respectively;

2 and 6 the upper and lower fastening film, respectively;

3 and 5 the upper and lower reinforcing layers, respectively;

4 - solar cells;

8 and 9 - holes at the top and bottom reinforcing layers, respectively.

As anti-adhesive reinforcement layer using transparent to sunlight perforated ethylenevinylacetate film "EVA", treated with anti-adhesive composition (for example, silicone antiadhesion "SYL-OFF" company "Dow Corning"). The film thickness is selected based 200-350 μm and due to the typical size of the mi etiennette films, manufactured for use in electronics technology and solar energy.

The clutch bearing and fastening tapes to each other in the inventive design of flexible photovoltaic module is only through the holes in the perforated film in the manufacturing process of the module (operations lamination of solar cells).

This feature of the construction illustrated by figure 3, where:

7 is a bottom carrier film;

2 and 6 the upper and lower fastening film, respectively;

5 - lower reinforcing layer;

4 - solar cells;

9 - holes at the bottom reinforcing layer 5;

10 - the area of the lack of adhesion of the films 7 and 8;

11 - region of the lack of adhesion of the films 6 and 8.

Due to the anti-adhesive properties of the film 5 outside areas clutch 9 film 5 is not rigidly attached to the surfaces of the films 6 and 7 in the seats 10 and 11. Thus, region 9 function as dampers elastic deformation in any direction in the plane of the module.

The holes in the perforated film should have a regular geometric shape (circle, square, regular hexagon, and the like). In this case, the conditions of plastic deformation of the module structure in at least two planes at the same time without causing mechanical damage to solar cells.

The ratio is their space profile holes and square unperforated film surface may vary within wide limits and is determined only by the conditions for future use module: the smaller this ratio, the greater the stiffness has a design and, accordingly, the less plastic deformation may be subjected to the module.

Large square ratio profile holes and square unperforated film surface (90% or more) are unacceptable from the point of view of technology perforations of the film and reduce its mechanical strength, which, in turn, makes it difficult technological operations with the use of this film (in particular, the lamination process module).

The optimal ratio of the areas profile holes and square unperforated film surface is 50%, which is easily accomplished when using the perforation in the water holes of the round shape.

In known science and technology solutions to similar problems not found use in flexible photovoltaic modules as a reinforcing layer additionally introduced a perforated film of anti-adhesive material or coated with anti-adhesive material.

Implementation of the proposed design flexible photovoltaic module material is as follows.

On the timeline splits the first film plastic (transparent ethylene-tetrafluroethylene film "TEFZEL" a given area). It placed the film "EVA", treated with anti-adhesive composition "SYL-OFF" by the DOW CORNING", thickness of 250 μm, which previously by rolling the tape over the spiked rollers made holes the size of 10.0×10.0 mm at a distance of 0.8 mm from each other. On top of this film fits ethylenevinylacetate film "EVA".

On top of this pile is placed soldered chain of solar cells from monocrystalline silicon. The thickness of each of the solar cell is ~200 ám.

On top of solar cells sequentially stacked film "EVA", the above - treated anti-adhesive composition "SYL-OFF perforated film "EVA", and then the film "TEFZEL".

Prepared layered billet is placed in the laminator, where the formation of the PV module at a temperature of ~150°C for 20 minutes

Thus formed flexible photovoltaic module can be subjected to elastic deformation in both longitudinal and transverse directions simultaneously, it is possible that the radius of curvature of the module is approximately equal respectively to the length or width of the flexible photovoltaic module.

The technical result achieved by using the proposed design is to provide elastic deformation of the plane of the flexible photovoltaic module simultaneously in two or more directions.

Sources of information

1. Patent of the Russian Federation, IPC: H01L 31/18 No. 2190901 from September 24, 1997

2. Patent of the Russian Federation, IPC: H01L 31/05, No. 2234166 from April 21, 2003

3. U.S. patent, IPC: H01L 35/04, No. 4043834 of August 23, 1977

4. Patent of the Russian Federation, IPC: F24J 2/42, H01L 31/00, No. 2416056 on December 17, 2009 - prototype.

Design flexible photovoltaic module, representing successively located lower carrier film, the lower reinforcing layer, the lower fastening tape, electrically interconnected solar cells, the upper fastening tape, the upper reinforcing layer and the upper carrier film, and the upper and lower bearing and fastening tapes are made from transparent to solar light material, characterized in that the reinforcing layer is used is transparent to sunlight perforated film of anti-adhesive material or covered with a layer of anti-adhesive material, the perforations in which are made in the form of regularly spaced holes.



 

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