CN203071070U - Composite power supply of solar cell-thermoelectric cell - Google Patents

Abstract

The utility model relates to a composite power supply of a solar battery-thermoelectric battery, which includes a solar battery and a thermoelectric battery, and is characterized in that: the hot end substrate of the thermoelectric battery and the backlight substrate surface of the solar battery are seamlessly coupled as one, and the The surface of the cold terminal substrate of the thermoelectric battery is made of emission coating. The utility model seamlessly couples the hot end of the thermoelectric cell to the substrate surface of the solar cell, utilizes sunlight for photovoltaic power generation, and effectively utilizes the waste heat on the backlight surface of the solar cell for thermoelectric power generation. While fully utilizing the heat, the utility model realizes The overall conversion efficiency of the composite power supply is improved.

Description

A Composite Power Source of Solar Cell-Temperature Difference Cell

technical field

The utility model belongs to the technical field of photoelectricity and temperature difference power supply, in particular to a composite power supply of a solar cell and a temperature difference battery.

Background technique

The demand for solar cells in the space field is strong. Whether it is gallium arsenide solar cells or flexible thin-film solar cells, they all face the problem of how to further improve the photoelectric conversion efficiency of cells. People are concentrating on how to further optimize the battery structure, ignoring the fact that there is still a huge amount of heat energy in the back of the solar cell that is not utilized. If the existing energy conversion technology is used to convert this part of heat energy into electrical energy, the improvement of the energy conversion efficiency of the space power system will be just around the corner.

The thermoelectric battery is a solid-state energy conversion device that can directly convert thermal energy into electrical energy. It has the characteristics of small size, quietness, long life, and good radiation resistance. It is an ideal choice for the power supply system of space vehicles. However, due to the relatively low thermoelectric conversion efficiency of the power supply (less than 10%), its application is limited.

Both solar cells and thermoelectric cells are physical power sources, and both perform energy conversion through physical processes. If the thermoelectric cell is coupled to the backlight surface of the solar cell, and the heat from the back of the solar cell is fully utilized to generate electricity, the energy of the overall power system can be superimposed, and the efficiency of the power system can be improved as a whole.

Currently known solar cell-thermocell composite power generation systems are all implemented using spectroscopic technology, that is, to collect sunlight of different wavelengths to provide heat sources for solar cells and thermocells for power generation respectively. This kind of power generation system organically combines photoelectric thermoelectric technology to improve the utilization rate of solar light energy, so that the light energy that could not be absorbed by solar cells can generate electric energy through thermoelectric technology. The current popularity of this technology is not high, mainly due to the high production cost; in addition, in a sense, the two batteries supply power separately, which is not a real composite power supply, nor can it realize the superposition of the overall conversion efficiency of the power supply.

After searching, it is found that the application number is 201110373913.4, the publication number is CN102437212A, and the patent name is: an invention patent for a photoelectric-thermoelectric integrated battery component. In the honeycomb core in the substrate, the temperature difference between the upper and lower surfaces of the substrate is used to generate electricity. The disadvantage of this invention is that the heat on the lower surface of the solar cell is conducted to the hot end of the thermoelectric cell through layers, and the heat loss is obvious, and the integration of conventional thermoelectric devices and solar cells has no weight advantage, and it is not easy to establish a temperature difference.

Contents of the invention

In order to solve the technical problems in the known technology, the utility model provides a solar cell-thermocell composite power supply with small heat loss, large working temperature difference and high energy conversion efficiency.

The technical scheme adopted in the utility model is:

A composite power supply of a solar cell-thermocell, comprising a solar cell and a thermocell, characterized in that: the hot end substrate of the thermocell and the backlight substrate surface of the solar cell are seamlessly coupled as one, and the cold side of the thermocell The surface of the end substrate is coated with an emissive coating.

The utility model can also adopt the following technical solutions:

The solar cell is a monolithic three-section GaInP ₂ /GaAs/Ge solar cell, and the thermoelectric cell is a BiTe-based thin film thermoelectric cell.

The seamless coupling is that the hot end substrate of the thermoelectric cell is adhered to the surface of the backlight substrate of the solar cell through a coupling agent.

The seamless coupling is a thermoelectric cell formed by directly growing a thermoelectric thin film and a conductive layer on a solar cell backlight substrate.

The coupling agent is organic thermal conductive silicone grease.

The substrates of the thermoelectric cell and the solar cell are both polyimide films.

The advantages and positive effects that the utility model has are:

1. The utility model seamlessly couples the hot end of the thermoelectric cell to the substrate surface of the solar cell. While using sunlight for photovoltaic power generation, it effectively utilizes the waste heat of the backlight surface of the solar cell for thermoelectric power generation. While fully utilizing the heat, Realized the improvement of the overall conversion efficiency of the composite power supply;

2. The utility model adopts thin-film thermoelectric battery and gallium arsenide solar battery for compounding, and makes them use the same substrate material, not only the overall weight of the composite power supply is light, but also the heat conduction and weight of solar battery and thermoelectric battery are improved. aspects of compatibility;

3. The utility model makes an emission coating made of organic silicon with high emissivity on the surface of the cold end substrate of the thermoelectric battery, which effectively improves the heat dissipation of the cold end of the thermoelectric battery, increases the working temperature difference of the composite power supply system, and further improves The energy conversion efficiency of the hybrid power system is improved.

Description of drawings

Fig. 1 is a structural schematic diagram of a solar cell-thermocell composite power supply of the present invention.

In the figure, 1-solar cell, 2-P-type thermoelectric element, 3-N-type thermoelectric element, 4-cold end conductive layer, 5-substrate.

Detailed ways

In order to further understand the invention content, characteristics and effects of the present utility model, the following examples are given, and detailed descriptions are as follows in conjunction with the accompanying drawings:

A solar battery-thermoelectric composite power supply comprises solar batteries and thermoelectric batteries.

The innovations of the utility model include:

The hot end substrate of the thermoelectric cell is seamlessly coupled with the backlight substrate surface of the solar cell, and the cold end substrate surface of the thermoelectric cell is provided with an emission coating.

The innovation of the utility model also includes:

The solar cell is a monolithic three-section GaInP ₂ /GaAs/Ge solar cell, and the thermoelectric cell is a BiTe-based thin film thermoelectric cell.

The seamless coupling is that the hot end substrate of the thermoelectric cell is adhered to the surface of the backlight substrate of the solar cell through a coupling agent.

The seamless coupling is a thermoelectric cell formed by directly growing a thermoelectric thin film and a conductive layer on a solar cell backlight substrate.

The coupling agent is organic thermal conductive silicone grease.

The substrates of the thermoelectric cell and the solar cell are both polyimide films.

A kind of manufacture process of the present utility model:

Referring to attached drawing 1:

(1) Single-chip three-section GaInP ₂ /GaAs/Ge solar cell 1 is selected. The substrate material of the solar cell is a flexible polyimide film, and the thickness of the solar cell is about 140 μm;

(2) Using the method of magnetron sputtering, directly make Ni on the flexible polyimide film cold-end substrate 5 as the cold-end conductive layer 4, and use spraying technology to make an organic silicon coating with high emissivity on the surface of the cold-end substrate. The material and manufacturing method of the hot end conductive layer are exactly the same as the cold end conductive layer, but the hot end substrate of the flexible polyimide film does not need to be made of an emission coating; the method of magnetron sputtering is used to conduct electricity at the cold and hot ends N-type thermoelectric element 3 and P-type thermoelectric element 2 are grown between the layers. All thermoelectric elements are integrated and connected in series. The positive and negative wires are drawn from the output terminal of the cold end to make a BiTe-based thin film with a thickness of about 140 μm. thermoelectric battery;

(3) Coating the organic heat-conducting silicone grease as a coupling agent between the surface of the backlight substrate of the solar cell and the hot end substrate of the thin-film thermoelectric cell to perform direct coupling between the thermoelectric cell and the solar cell. , drive and get rid of the air bubbles between the two, and complete ^the solar battery-thermobattery composite power supply of the utility model shown in Figure 1.

The above-mentioned solar cell-thermocell composite power supply directly couples the thin-film thermoelectric cell and the gallium arsenide solar cell. The two use the same substrate material to achieve mutual weight matching; in addition, the thin-film thermoelectric cell can integrate hundreds of Even with thousands of pairs of thermoelectric elements, even at a temperature difference of 1°C, there will be an obvious electrical output, which can effectively use the temperature of the backlight of the solar cell to generate electricity. The solar battery-thermoelectric battery composite power supply simulates the working condition of space AM _0. Under this condition, the temperature of the back and bottom of the solar battery is 80°C. Based on the heat input of 10W and the working temperature difference of 10°C, the electric power output of the thermoelectric battery is 323mW, which can make the composite The power supply has a conversion efficiency improvement of 3 percentage points.

Another manufacturing process of the present utility model:

On the backlight substrate of the solar cell, the method of magnetron sputtering is used to directly grow the conductive layer of the hot end, the N-type thermoelectric element, and the P-type thermoelectric element in sequence. The hot end substrate of the solar cell and the backlight substrate of the solar cell are the same substrate, and a solar cell-thermocell composite power supply is produced.

Although the preferred embodiment of the utility model has been described above in conjunction with the accompanying drawings, the utility model is not limited to the above-mentioned specific implementation, and the above-mentioned specific implementation is only illustrative and not restrictive. Under the enlightenment of the utility model, those of ordinary skill can also make many forms without departing from the purpose of the utility model and the scope protected by the claims. These structures all belong to the protection scope of the present utility model.

Claims (6)

1. A composite power supply of a solar cell-thermocell, comprising a solar cell and a thermocell, characterized in that: the hot end substrate of the thermocell and the backlight substrate surface of the solar cell are seamlessly coupled as one, and the thermocell The surface of the cold end substrate is made of emissive coating. 2. The composite power supply of a solar cell-thermocell according to claim 1, characterized in that: the solar cell is a monolithic three-section _GaInP2 /GaAs/Ge solar cell, and the thermocell is a BiTe-based thin film thermocell . 3. A solar cell-thermocell composite power supply according to claim 1 or 2, characterized in that: the seamless coupling is that the hot end substrate of the thermocell is adhered to the surface of the backlight substrate of the solar cell via a coupling agent. 4. A solar battery-thermoelectric composite power supply according to claim 1 or 2, characterized in that: the seamless coupling is a thermoelectric battery formed by directly growing a thermoelectric thin film and a conductive layer on the backlight substrate of the solar battery. 5. A solar cell-thermocell composite power supply according to claim 3, characterized in that: the coupling agent is an organic heat-conducting silicone grease. 6. A solar cell-thermocell composite power supply according to claim 1 or 2, characterized in that: the substrates of the thermocell and the solar cell are both polyimide films.

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