CN201323202Y

CN201323202Y - Device for improving photoelectric conversion efficiency of silicon photocell

Info

Publication number: CN201323202Y
Application number: CNU2008201611002U
Authority: CN
Inventors: 李庆明; 赵石林
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-11-17
Filing date: 2008-11-17
Publication date: 2009-10-07
Anticipated expiration: 2018-11-17

Abstract

Disclosed is a device for improving photoelectric conversion efficiency of a silicon photocell, which comprises a silicon photocell, a sunlight reflector and a bracket. The work surface of the silicon photocell and the sunlight reflector are oppositely fixed on the bracket, a light filter plate is mounted between the work surface of the silicon photocell and the sunlight reflector, and the sunlight reflector and the non-work surface of the silicon photocell face the sun. Only ultraviolet lights and visible lights of the sunlight can pass through the light filter plate to enter the sunlight reflector and to be reflected to the work surface of the silicon photocell, thereby generating photoelectric reaction. Infrared lights incapable of generating the photoelectric reaction on the work surface of the silicon photocell mostly stopped by the light filter plate can not enter the sunlight reflector and are directly reflected to the atmospheric environment, thereby decreasing the work temperature of the work surface of the silicon photocell, effectively changing the sunlight distribution of the work surface of the silicon photocell, being capable of exponentially improving the photoelectric conversion efficiency and the output power of existing silicon photocells and greatly reducing one-time investment costs.

Description

Improve the device of photoelectric conversion efficiency of silicon photovoltaic cell

Technical field:

The utility model relates to the photocell field, particularly improves the device of photoelectric conversion efficiency of silicon photovoltaic cell.

Background technology:

The energy is that human society exists and the important substance basis of developing.Along with the in short supply and price of fossil energies such as oil, coal, natural gas raises up, people competitively carry out exploitation, the research of regenerative resource.Solar energy power generating is the important component part of regenerative resource.China began to develop photocell from 1958, mainly contained monocrystalline, polysilicon photocell product.

At present,, influenced its practical application because there are many drawbacks in silicon photocell: the one, solar energy density is low, and silicon photocell utilizes the cost height.Solar energy is the regenerative resource of cleaning, cheapness, and inexhaustible, nexhaustible, energy is huge, is radiated the energy about 8.1 * 10 of earth surface ¹³Kw, the hundreds of thousands that is equivalent to the energy production world amount doubly.But the earth surface energy density is lower relatively, and average of the whole year has only 600kcat/m ²H, about 0.7kw/m ²H; Be subjected to all multifactor impacts such as meteorology, geographic latitude, solar azimuth, elevation angle when utilizing in addition.Therefore, silicon photocell utilizes device area big, disposable input cost height.Build a 25kw photovoltaic plant as Tibet Ka Maxiang, annual energy output 53750kw/h, 2,630,000 yuan of gross investments, system invests about 100,000 yuan/kw, is 10 times of current wind power generation investment.The 2nd, the photoelectric conversion efficiency of silicon photocell assembly is low.At present, the silicon photocell assembly can commercial product based on list, polysilicon series of products, the photoelectric conversion efficiency of silicon photocell is low, generally has only 12-15%, photoelectric conversion efficiency is high reaches 18-25% at most.Because the silicon photocell square formation that the photovoltaic plant large tracts of land is installed is fixed installation, the angle of inclination is near local geographic latitude, therefore, throughout the year, influenced by the high angle of the sun and azimuth in one day, effective illuminating area of sunlight is accepted all less than 1 in silicon photocell square formation plane, is generally about 0.5-0.7.Therefore, the actual light photoelectric transformation efficiency of silicon photocell is also much lower.The 3rd, the photoelectric conversion efficiency that improves silicon photocell itself is very difficult.The major technique obstacle that the restriction photoelectric conversion efficiency of silicon photovoltaic cell improves is: battery surface grid line shading influence, the reflective loss of battery surface, photoconduction loss, inner recombination losses and surface recombination loss etc.In view of above all multifactor impacts, though the theoretical value of the photoelectric conversion efficiency of silicon photocell is 33%, the actual light photoelectric transformation efficiency of the silicon photocell product on the international market is: monocrystalline is the highest to have only 24%, and polycrystalline is the highest to have only 21%.Therefore, the photoelectric conversion efficiency that improve silicon photocell is difficult to.

In sum, the photoelectric conversion efficiency of silicon photocell is low, and the photovoltaic plant floor space is big, the one-time investment height, and deficiency in economic performance has influenced applying of silicon photocell.

The utility model content:

The purpose of this utility model is to overcome the deficiencies in the prior art, a kind of device that improves photoelectric conversion efficiency of silicon photovoltaic cell is provided, by increasing the photoirradiation intensity on the silicon photocell working face, the sunlight that changes on the silicon photocell working face distributes, minimizing improves the rising that causes the silicon photocell working temperature because of sunlight to silicon photocell working face irradiance, thereby improve the photoelectric conversion efficiency of silicon photocell, reduce the application cost of silicon photocell, in order to applying of silicon photocell.

Solution of the present utility model: contain silicon photocell, sunlight reflector, support, the working face of silicon photocell and sunlight reflector are fixed on the support in opposite directions, lay to stop infrared light to enter sunlight reflector filter between the working face of silicon photocell and sunlight reflector.

The sunlight reflector is a face of cylinder condenser, and the minute surface of face of cylinder condenser is a base material by smooth smooth thin plate, posts reflectorized material on the base material, and reflectorized material is pasted at the silicon photocell back side, or adds one deck shadow shield.

The base material of face of cylinder condenser minute surface is the plastics sunlight board of thickness 1-2mm, or corrosion resistant plate, or glass epoxy, and reflectorized material is the stainless sheet steel of polishing, or the polyester vacuum plated aluminum film; The thickness of shadow shield is the opaque white color sheet plastic of 1-1.5mm.

The filter of laying between the working face of silicon photocell and sunlight reflector is a clear plate glass, and clear plate glass is sealed on the opening of face of cylinder condenser.

Support is divided into upper bracket and lower carriage two parts, upper bracket is fixed on the lower carriage, silicon photocell is placed on the upper bracket, face of cylinder condenser is fixed on the lower carriage, lower carriage contains two pairs of legs that relative altitude is adjustable, be convenient to adjust the angle of inclination of face of cylinder condenser, to adapt to the different needs of different latitude area angle of incidence of sunlight.

The center line of silicon photocell working face stray circle cylinder condenser lens, and the clear plate glass as filter suitable for reading with being fixed on face of cylinder condenser is parallel, the dual-side of silicon photocell working face lays respectively on the midship section of face of cylinder condenser, and two midship sections overlap with the center line of face of cylinder condenser and face of cylinder condenser sideline, both sides suitable for reading respectively.

Advantage of the present utility model:

1, adopt face of cylinder condenser optically focused reflection, sunray focuses on the center line, or formation and face of cylinder condenser parallel caustic surface suitable for reading.Face of cylinder optical collector structure is simple, need not tracking means, and easy to operate, with low cost.

2, changed the distribution of solar spectrum, for silicon photocell, have only visible light that silicon photocell is had photovoltaic reaction, and ultraviolet light, infrared light do not have photovoltaic reaction to silicon photocell, the ultraviolet light energy is little, and infrared energy is big, account for 43% of solar radiation total amount, adopt clear plate glass to be sealed on the opening of face of cylinder condenser, energy 100% is by ultraviolet light, visible light, infrared light can not see through clear plate glass, and 100% is reflected.Reflex on the working face of silicon photocell assembly after the visible light that sees through clear plate glass is focused on by face of cylinder condenser again, improved the photoirradiation intensity of battery significantly, the battery short circuit electric current also is multiplied.

3, reduced the working temperature of silicon photocell.Infrared radiation is thermal radiation, can improve by the surface temperature of radiant body, and along with the raising of silicon photocell photoirradiation intensity, the silicon photocell working temperature also improves thereupon usually.The utility model adopts clear plate glass to be sealed on face of cylinder condenser suitable for reading, reflect most of infrared light, the silicon photocell working face down, reflection or shading measure are taked in the back side, obviously reduced the thermal radiation of sunlight, reduce photronic working temperature, improved the photoelectric conversion rate of silicon photocell significantly.

4, adopt the utility model that existing photoelectric conversion efficiency of silicon photovoltaic cell, power output are significantly improved, building the silicon photocell square formation area that the photovoltaic plant of same power need be equipped with will reduce at double, greatly reduce the one-time investment cost, reduced construction area, improve the economic benefit of solar photovoltaic utilization, helped applying of silicon photocell.

Description of drawings:

Fig. 1 is the structural representation of the utility model embodiment;

Fig. 2 is the A A cutaway view of the utility model embodiment.

Among the figure: the 1-lower carriage; The 2-upper bracket; The 3-shadow shield; 4-silicon photocell assembly flat board; The 5-clear plate glass; The 6-leg; The 7-adjustable pipe; The 8-leg; 9-face of cylinder condenser; The 10-base material; The 11-reflective membrane; The 12-corrosion resistant plate.

Embodiment:

Improve the device of photoelectric conversion efficiency of silicon photovoltaic cell, encapsulate silicon photocell assembly flat board 4 by the applied power requirement by silicon photocell manufacturer, present embodiment is by 8 monomer silicon photocell series, parallel, and be packaged into silicon photocell assembly flat board 4, length and width size and the catoptrical multiple of acceptance according to dull and stereotyped 4 working faces of silicon photocell assembly determine to focus on ratio, set face of cylinder condenser 9 daylighting face length and width sizes.Silicon photocell assembly flat board 4 is fixed on the upper bracket 2, upper bracket 2 is fixed on the lower carriage 1, lower carriage 1 has two pairs of legs 6,8, wherein, on a pair of leg 6 adjustable pipe 7 is housed, make the relative altitude of two pairs of legs 6,8 adjustable, be convenient to adjust the angle of inclination of face of cylinder condenser 9, the Northern Hemisphere is towards south, the Southern Hemisphere is towards north, the center line of face of cylinder condenser 9 and ground level inclination angle to adapt to the different needs of different latitude area angle of incidence of sunlight, guarantee that face of cylinder condenser 9 had preferable daylighting effect near local geographic latitude in 1 year.Face of cylinder condenser 9 is fixed on the lower carriage 1, keeps the working face and the face of cylinder condenser 9 of silicon photocell assembly flat board 4 to be provided with in opposite directions, guarantees that the working face of silicon photocell assembly flat board 4 overlaps with the focusing surface of the face of cylinder condenser 9 of setting.Sunray becomes a focusing surface by reflective membrane 11 reflect focalizations of face of cylinder condenser 9, if focusing surface is positioned on the center line of face of cylinder condenser 9, then focusing surface just is a line; If focusing surface disalignment, then focusing surface is just for being parallel to face of cylinder condenser 9 focusing surface suitable for reading, focusing surface is near more apart from center line, focusing surface is more little, focus on bigger than more, the irradiance of the sunlight of face of cylinder condenser 9 reflections of accepting on the focusing surface is big more, otherwise the irradiance of the sunlight of acceptance is just low.According to this characteristic, the face of cylinder condenser 9 that the working face of silicon photocell assembly flat board 4 is arranged on setting focuses on the focusing surface of ratios, and silicon photocell assembly dull and stereotyped 4 just can receive the irradiation that is several times as much as sunlight.Laying the thickness that can stop infrared light to enter face of cylinder condenser between the working face of silicon photocell assembly flat board 4 and face of cylinder condenser 9 is the clear plate glass 5 of the low iron-holder of 3mm, and clear plate glass 5 is sealed on the suitable for reading of face of cylinder condenser 9.Silicon photocell assembly dull and stereotyped 4 and clear plate glass 5 be arranged in parallel.The base material 10 of the minute surface of face of cylinder condenser 9 is the corrosion resistant plate of thickness 1.5mm; post the polyester vacuum plated aluminum film on the corrosion resistant plate as reflective membrane 11; the both ends of the surface thickness of face of cylinder condenser 5 is corrosion resistant plate 12 sealings of 1mm; enter face of cylinder condenser 9 with dust protection, rainwater; protection polyester vacuum plated aluminum film leaves venthole at a low end during sealing.Be that opaque white color sheet plastic that to have laid a thickness be 1mm is as shadow shield 3 at 2cm place, dull and stereotyped 4 back side of distance silicon photocell assembly.The center line of the dull and stereotyped 4 working face stray circle cylinder condenser lens 9 of silicon photocell assembly, and the clear plate glass 5 suitable for reading with being fixed on face of cylinder condenser 9 is parallel, the dual-side of dull and stereotyped 4 working faces of silicon photocell assembly lays respectively on the midship section of face of cylinder condenser 9, and two midship sections overlap with the center line of face of cylinder condenser 9 and face of cylinder condenser 9 sideline, both sides suitable for reading respectively.

This embodiment can also can form photovoltaic plant with some present embodiment series and parallels directly as applied power source.

Improve the method for photoelectric conversion efficiency of silicon photovoltaic cell, by 8 monomer silicon photocell series connection, in parallel, and be packaged into silicon photocell assembly flat board 4, silicon photocell assembly flat board 4 is fixed on the upper bracket 2, upper bracket 2 is fixed on the lower carriage 1, face of cylinder condenser 9 is fixed on the lower carriage 1, keep the working face and the face of cylinder condenser 9 of silicon photocell assembly flat board 4 to be provided with in opposite directions, the non-working surface of face of cylinder condenser 9 and silicon photocell assembly flat board 4 is towards the sun, between the working face of silicon photocell assembly flat board 4 and face of cylinder condenser 9, lay clear plate glass 5, only make the visible light of sunlight and ultraviolet luminous energy pass clear plate glass 5 and enter face of cylinder condenser 9, and reflex on the working face of silicon photocell assembly flat board 4, photovoltaic reaction takes place, and the infrared light of photovoltaic reaction can not take place on the working face of silicon photocell assembly flat board 4, most of being stopped by clear plate glass 5 can not enter face of cylinder condenser 9, directly be reflected in the atmospheric environment, reduced the working temperature of dull and stereotyped 4 working faces of silicon photocell assembly, effectively change the distribution of sunlight of the working face of silicon photocell assembly flat board 4, improved the photoelectric conversion efficiency of silicon photocell assembly flat board 4 significantly.

Claims

1, improves the device of photoelectric conversion efficiency of silicon photovoltaic cell, it is characterized in that containing silicon photocell, sunlight reflector, support, the working face of silicon photocell and sunlight reflector are fixed on the support in opposite directions, lay to stop infrared light to enter sunlight reflector filter between the working face of silicon photocell and sunlight reflector.

2, the device of raising photoelectric conversion efficiency of silicon photovoltaic cell according to claim 1, it is characterized in that the sunlight reflector is a face of cylinder condenser, the minute surface of face of cylinder condenser is a base material by smooth smooth thin plate, post reflectorized material on the base material, reflectorized material is pasted at the silicon photocell back side, or adds one deck shadow shield.

3, the device of raising photoelectric conversion efficiency of silicon photovoltaic cell according to claim 2, the base material that it is characterized in that face of cylinder condenser minute surface is the plastics sunlight board of thickness 1-2mm, or corrosion resistant plate, or glass epoxy, reflectorized material is the stainless sheet steel of polishing, or the polyester vacuum plated aluminum film; The thickness of shadow shield is the opaque white color sheet plastic of 1-1.5mm.

4, the device of raising photoelectric conversion efficiency of silicon photovoltaic cell according to claim 3, it is characterized in that the filter of laying between the working face of silicon photocell and sunlight reflector is a clear plate glass, clear plate glass is sealed on the opening of face of cylinder condenser.

5, the device of raising photoelectric conversion efficiency of silicon photovoltaic cell according to claim 4, it is characterized in that support is divided into upper bracket and lower carriage two parts, upper bracket is fixed on the lower carriage, silicon photocell is placed on the upper bracket, face of cylinder condenser is fixed on the lower carriage, lower carriage contains two pairs of legs that relative altitude is adjustable, is convenient to adjust the angle of inclination of face of cylinder condenser, to adapt to the different needs of different latitude area angle of incidence of sunlight.

6, the device of raising photoelectric conversion efficiency of silicon photovoltaic cell according to claim 5, the center line that it is characterized in that silicon photocell working face stray circle cylinder condenser lens, and the clear plate glass as filter suitable for reading with being fixed on face of cylinder condenser is parallel, the dual-side of silicon photocell working face lays respectively on the midship section of face of cylinder condenser, and two midship sections overlap with the center line of face of cylinder condenser and face of cylinder condenser sideline, both sides suitable for reading respectively.