CN203933529U - Holographic optically focused light splitting solar power generation module - Google Patents

Abstract

A holographic condensing and splitting solar power generation module, characterized in that it includes: a holographic condensing lens (1), one or more beam splitters (2), and a combination of photovoltaic cells; wherein: the holographic condensing lens (1) is located The incident end of light; the one or more beam splitters (2) are located on the optical path between the light incident end and the photovoltaic cell combination; the photovoltaic cell combination includes a plurality of photovoltaic cells, and are respectively located on the beam splitter (2) ) on the focal plane of the transmitted and reflected light.

Description

Holographic Concentrating and Splitting Solar Power Module

technical field

The utility model discloses a holographic condensing light-splitting solar power generation module, which belongs to the technical field of photovoltaics.

Background technique

At present, the third-generation photovoltaic power generation technology represented by concentrated photovoltaic power generation (CPV) is experiencing rapid development, and its related technologies have become research and development hotspots of various research institutes and enterprises. Various concentrated photovoltaic demonstration projects and large-scale power stations It is also appearing all over the world. As far as its main principle is concerned, concentrated photovoltaic power generation technology (CPV) refers to the use of lenses or mirrors to focus the received sunlight, so that the focused high-energy-density light spot is aligned with a small-area, high-efficiency silicon or poly Combine compound solar cell chips to obtain energy output. Concentrating photovoltaic technology has the advantages of high conversion efficiency, low battery consumption, environmental friendliness, low system attenuation, long service life, small footprint, convenient maintenance, high reliability, easy to be combined and installed in a large range to form a large-scale photovoltaic power station, etc. advantage.

The main functional modules of existing concentrating photovoltaic systems generally include concentrating lenses, photovoltaic cells, and auxiliary high-precision solar devices. The high-efficiency work of concentrating photovoltaic modules is highly dependent on the expensive day-to-day device and the tracking accuracy of the device, otherwise it will not be able to accurately gather light onto the photovoltaic cells; The difference is also proportional to the size of the photovoltaic cell. In order to increase the acceptance angle to reduce the accuracy requirements for the solar device under the condition of the same lens, it is necessary to increase the cell area, which will greatly increase the cost.

In addition, the cells currently used in concentrated photovoltaic systems are generally silicon cells or multi-junction compound cells. The bandgap width of silicon cells is about 1.12eV, and there is a large waste of energy for the absorption of short-wavelength high-energy light, and the highest cell conversion efficiency is only about 20%. For multi-junction solar cells (the current international mainstream is GaInP/GaAs/Ge triple-junction stack cells), since this type of cell uses multi-junction sub-cell stacks and cascades, each sub-cell is equivalent to a series relationship, and current matching is required. The extra current generated by the long-wave band is wasted because it cannot be matched. Therefore, its cell efficiency is currently around 40% and it is difficult to further improve it. However, when it is applied to light-concentrating conditions, the system conversion efficiency is generally only around 30%.

The above status quo limits the application occasions and further improvement of conversion efficiency of concentrating photovoltaic systems, and constitutes the bottleneck of the development of concentrating photovoltaics.

Utility model content

The purpose of this utility model is to propose a holographic light-concentrating and splitting solar power generation module in order to obtain a photovoltaic power generation device that has a higher photoelectric conversion rate per unit area and does not require high day-to-day precision or even avoids a day-to-day system for wide-angle receiving light.

The purpose of this utility model is achieved by the following technical solutions:

A holographic condensing and splitting solar power generation module, characterized in that it includes:

A holographic condenser lens (1), one or more beam splitters (2), and a combination of photovoltaic cells; where:

The holographic condenser lens (1) is located at the incident end of the light;

The one or more beam splitters (2) are located on the optical path between the light incident end and the photovoltaic cell assembly;

The photovoltaic cell assembly includes a plurality of photovoltaic cells, which are respectively located on the focus planes of the transmitted light and reflected light of the beam splitter (2).

The number of photovoltaic cells and the wavelength of the photovoltaic cell combination correspond to the beam splitter (2), and the number of photovoltaic cells in the photovoltaic cell combination is one more than the number of the beam splitter; The spectral segments correspond to the response wavelength ranges of the photovoltaic cells of the photovoltaic cell array.

The holographic condensing lens (1) is a combined lens structure with holographic diffraction condensing and geometric condensing functions.

The holographic condensing lens is one of: a combination of a plano-convex lens and a holographic film, or a combination of a Fresnel lens and a holographic film.

The plano-convex lens and the Fresnel lens are prepared by molding acrylic engineering plastics and glass and silica gel, and the holographic film is prepared by evaporating dichromate or silver bromide suitable for holographic photosensitive materials or by attaching them In the combined lens structure.

The number of the one or more beam splitters (2) can be selected from 1 to 5.

The dichroic mirror adopts a dichroic prism or a dichroic mirror. The base material of the dichroic mirror is glass or high transmittance engineering plastics. way of preparation.

The number of the plurality of photovoltaic cells in the photovoltaic cell combination is between 2 and 6.

The respective response cut-off wavelengths of the photovoltaic cells have intervals ranging from tens of nanometers to hundreds of nanometers, and the combination methods adopted can include: silicon cells and Ga(In)As/GaInP cells, silicon cells, Ga(In) ) The combination of As/GaInP battery and InGaP battery.

The beneficial effect of the utility model is that: the use of the holographic condenser lens can realize the absorption of wide-angle light, so that the module has a larger range of receiving angles, thereby avoiding the use of high-precision solar devices or directly not using the solar devices, at the same time It can also collect scattered light except for direct light, so that the module has high light energy input; use a beam splitter and a matching multi-cell combination to divide the total incident light into different continuous wave bands and use them separately, avoiding The energy waste of a single type of battery for high-energy short-wave light or the current mismatch in a multi-junction stack battery enables the module to achieve the maximum utilization of light energy. By increasing the total incident energy of the module and reducing the energy loss in the conversion process, this module is expected to obtain a system conversion efficiency much higher than that of ordinary crystalline silicon concentrators and multi-junction cell concentrators.

Description of drawings

Fig. 1 is a schematic diagram of Embodiment 1 of a holographic light-concentrating and light-splitting solar power generation module.

Fig. 2 is a schematic diagram of Embodiment 2 of a holographic light-concentrating and light-splitting solar power generation module.

In Fig. 1, 1. Holographic condenser lens, 2. 880nm dichroic mirror, 3. 520nm dichroic mirror, 4. Silicon cell, 5. Ga(In)As/GaInP cell, 6. InGaN cell, 7. Incident light, 8, focused light, 9, transmitted light after first split, 10, reflected light after first split, 11, transmitted light after second split, 12, reflected light after second split.

In Figure 2, 1. Holographic condenser lens, 2. 880nm dichroic mirror, 4. Silicon cell, 5. Ga(In)As/GaInP cell, 7. Incident light, 8. Focused light, 9. Primary light splitting Rear transmitted light, 10. Reflected light after primary splitting,

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

Embodiment one

Embodiment one sees Fig. 1. In this embodiment, the holographic condenser lens 1 adopts a sandwich structure of glass-holographic film-silica gel pressed Fresnel mirror; two beam splitters are used in the module, both of which are dichroic mirrors, respectively 880nm dichroic mirror 2 and 520nm dichroic mirror 3; there are three photovoltaic cells in total, which are InGaN cells 6 corresponding to absorbing light waves below 520nm in this module, and Ga(In)As/GaInP cells 5 corresponding to absorbing light waves of 520-880nm, And corresponding to the silicon battery 4 that absorbs light waves above 880nm.

In Figure 1, when the holographic concentrating and spectroscopic solar power generation module is working, the incident light 7 of sunlight (including direct and scattered light) enters the module through the holographic concentrating lens 1. Since the holographic concentrating lens 1 contains a holographic film and a wide The Fresnel lens with acceptance angle design can realize the absorption and focusing of light with large incident angle, thus realizing the efficient light concentrating effect. After the condensed light 8 is incident on the 880nm dichroic mirror 2, the light with a wavelength greater than 880nm is selectively transmitted to form a split light and the transmitted light 9 is incident on the silicon cell 4, which is converted into electrical energy output by the silicon cell 4 and the part of the light with a wavelength less than 880nm is reflected by the 880nm dichroic mirror 2 to form a reflected light 10 after a split, and is incident on the mirror surface of the 520nm dichroic mirror 3 . The part with a wavelength greater than 520nm can pass through the 520nm dichroic mirror 3 to form a secondary light splitter and then transmit the light 11 and irradiate the Ga(In)As/GaInP cell 5, and be absorbed by the Ga(In)As/GaInP cell 5 and converted into Electric energy; while the high-energy wavelength with a wavelength of less than 520nm is reflected by the 520nm dichroic mirror 3 to form a secondary spectroscopic reflected light 12, which is irradiated on the InGaN battery 6 to obtain energy output with a higher voltage.

In this embodiment, by introducing the holographic condensing lens 1, the power generation module can have a wide-angle light-gathering capability, which not only reduces the requirements for the day-to-day system, but also collects additional scattered light to maximize the incident light energy. The use of two beamsplitters can split the spectrum of incident light from 520nm and 880nm, and obtain light waves of three bands and irradiate them to the corresponding photovoltaic cells for use. In this process, the light waves of each band The light is subdivided and utilized, the energy loss in the photoelectric conversion is the smallest, and the energy generated by the three bands will be output separately, without considering the current or voltage matching, and avoiding a part of the matching loss. By increasing the overall incident energy of the module and reducing the energy loss in the conversion process, this module is expected to obtain a system conversion efficiency much higher than that of ordinary crystalline silicon concentrators and multi-junction cell concentrators.

Embodiment two

Embodiment 2 is shown in Figure 2. In this embodiment, the holographic condenser lens 1 adopts a sandwich structure of glass-holographic film-silica gel pressed Fresnel mirror; an 880nm dichroic mirror 2 is used as a beam splitter in the module; there are two photovoltaic cells, respectively In this module, they are Ga(In)As/GaInP cells 5 corresponding to absorbing light waves below 880nm, and silicon cells 4 corresponding to absorbing light waves above 880nm.

In Figure 2, when the holographic concentrating and spectroscopic solar power generation module is working, the incident light 7 of sunlight (including direct and scattered light) enters the module through the holographic concentrating lens 1. Since the holographic concentrating lens 1 contains a holographic film and a wide The Fresnel lens with acceptance angle design can realize the absorption and focus of light with large incident angle, thus realizing the high-efficiency light-gathering effect. After the condensed light 8 is incident on the 880nm dichroic mirror 2, the light with a wavelength greater than 880nm is selectively transmitted to form a split light and the transmitted light 9 is incident on the silicon cell 4, which is converted into electrical energy output by the silicon cell 4 ; and the part of the light with a wavelength less than 880nm is reflected by the 880nm dichroic mirror 2 to form a reflected light 10 after light splitting once, and irradiates the Ga(In)As/GaInP battery 5, is absorbed by it, and is converted into a higher voltage output of electric energy.

In this embodiment, a beam splitter and two kinds of photovoltaic cells are used to divide the spectrum of the incident light from 880nm to obtain light waves of two bands and irradiate them to the corresponding photovoltaic cells for use. In this process , the light in each band is subdivided and utilized, and the energy generated by the two bands is output separately, without considering the matching of current or voltage, which avoids a part of matching loss. By increasing the overall incident energy of the module and reducing the energy loss in the conversion process, this module is expected to obtain a system conversion efficiency much higher than that of ordinary crystalline silicon concentrators and multi-junction cell concentrators. However, compared with Example 1, since the light wave band is only divided once, some high-energy light waves still have a large energy loss in the photoelectric conversion, so the overall conversion efficiency is lower than that of Example 1.

But the above-mentioned person is only the preferred embodiment of the present utility model, and all the professionals who are familiar with this skill. After understanding technical means of the utility model, can change under the teaching of the utility model according to actual needs naturally. Therefore all equivalent changes and modifications done according to the patent scope of the utility model should still belong to the scope covered by the utility model patent.

Claims (6)

1. a holographic optically focused light splitting solar power generation module, is characterized in that, comprising:

Holographic collector lens (1), one or more spectroscope (2), photovoltaic cell combination; Wherein:

Described holographic collector lens (1) is positioned at the incident end of light;

Described one or more spectroscope (2) is in the light path between light incident end and photovoltaic cell combination;

Described photovoltaic cell combination comprises a plurality of photovoltaic cells, and lays respectively on the transmitted light and catoptrical focusing surface of described spectroscope (2);

The quantity of the photovoltaic cell of described photovoltaic cell combination and wavelength corresponding with described spectroscope (2), many 1 than described spectroscope quantity of the photovoltaic cell quantity of described photovoltaic cell combination; Each spectrum segment after described spectroscope light splitting is corresponding with the response wave length scope of the photovoltaic cell of described photovoltaic cell group.

2. holographic optically focused light splitting solar power generation module as claimed in claim 1, is characterized in that, described holographic collector lens (1) is the compound lens structure of hologram diffraction optically focused and how much light-focusing functions.

3. holographic optically focused light splitting solar power generation module as claimed in claim 1, is characterized in that, described holographic collector lens is: a kind of among planoconvex spotlight and holographic film combination, Fresnel Lenses and holographic film combination.

4. holographic optically focused light splitting solar power generation module as claimed in claim 1, is characterized in that, described one or more spectroscopes (2), and its quantity can be selected between 1 to 5.

5. holographic optically focused light splitting solar power generation module as claimed in claim 1, is characterized in that, described in described photovoltaic cell combination, the quantity of a plurality of photovoltaic cells is between 2 to 6.

6. holographic optically focused light splitting solar power generation module as claimed in claim 5, it is characterized in that, its of described photovoltaic cell response separately has the tens nanometer interval that extremely hundreds of nanometers do not wait by wavelength, the compound mode adopting has: silion cell and GaInAs and GaInP battery combination, the mode of silion cell, GaInAs and GaInP battery and InGaN battery combination.