A new type of solar cell for combined heat and power generation

Abstract

The present invention discloses a novel cogeneration solar cell, comprising a cell body, a plurality of fine grids are evenly spaced on the front of the cell body, an ultra-thin oxygen-free copper heat pipe is arranged perpendicularly to the fine grid as the main grid of the solar cell, one end of the ultra-thin oxygen-free copper heat pipe is flush with the edge of the cell, and the other end extends out of the edge of the cell to form an extension section, the edge of the solar cell on the extension section side is bonded with a heat-conducting insulating material, the extension section is fixed on the heat-conducting insulating material, and the free end of the extension section is welded with a welding strip. The present invention adopts an ultra-thin oxygen-free copper heat pipe to replace the main grid line of the existing solar cell and the welding strip welded on the main grid line, effectively reducing the comprehensive cost of the solar cell, and the ultra-thin oxygen-free copper heat pipe is used as the main conductive grid line and phase change heat transfer channel of the solar cell, which can realize current transmission and heat conduction at the same time, effectively improve the comprehensive energy output of the solar cell, and realize the cogeneration function of the solar cell.

Description

Technical Field

[0001] The invention belongs to the technical field of solar cell structure, and in particular relates to a novel cogeneration solar cell. Background Art

[0002] Solar energy has been widely used as a clean energy source. The application of solar photovoltaic power generation technology is mainly realized in the form of ground photovoltaic power stations, distributed photovoltaic power generation systems and photovoltaic building integration. Solar photovoltaic modules use photoelectric conversion to convert solar energy irradiated on solar cells into electrical energy. The performance of solar cells is an important factor affecting the efficiency of photoelectric conversion. The higher the photoelectric conversion efficiency, the more current the solar cell collects.

[0003] The common structure of solar cells at present is: a number of thin grids are evenly distributed on the front of the solar cell, and a plurality of main grids are also arranged on the front. The main grids are vertically intersected and connected with the thin grids, and welding strips are welded on the main grids. The main grids can collect the currents on the thin grids and transmit them through the welding strips welded on the main grids. However, the cost is relatively high, and the solar cell can only realize the function of solar photovoltaic power generation. The grid lines of the cell are all screen-printed with silver paste. When the solar cell is working, the increase of ambient temperature and irradiation temperature and uneven temperature distribution will cause the increase of short-circuit current of the cell, which will reduce the open-circuit voltage and battery filling factor of the cell, and reduce the peak power of the solar cell, which ultimately reduces the power generation efficiency and power generation of the cell. In addition, the heat generated in the power generation process of the solar cell cannot be directly used, and the heat energy is wasted greatly. Summary of the invention

[0004] In view of the deficiencies pointed out in the above background technology, the present invention provides a novel cogeneration solar cell, which aims to solve the problem that the existing solar cells in the above background technology realize current transmission by welding welding strips on the main grid, which has a high cost, and the solar cell can only realize the function of solar photovoltaic power generation. The grid lines of the cell are all screen-printed with silver paste. When the solar cell is working, the open circuit voltage of the single solar cell is reduced, the short circuit current is increased, and the peak power of the solar cell is reduced due to the increase of ambient temperature and irradiation temperature and uneven temperature distribution, which ultimately reduces the power generation efficiency and power generation of the cell and wastes heat energy.

[0005] To achieve the above object, the technical solution adopted by the present invention is:

[0006] A novel cogeneration solar cell comprises a cell body, a plurality of fine grids are evenly spaced on the front of the cell body, an ultra-thin oxygen-free copper heat pipe is arranged perpendicularly to the fine grids, one end of the ultra-thin oxygen-free copper heat pipe is flush with the edge of the solar cell, and the other end of the ultra-thin oxygen-free copper heat pipe extends out of the edge of the solar cell to form an extension section, a heat-conducting insulating material is bonded to the edge of the solar cell on the extension section side, the extension section is fixed on the heat-conducting insulating material, and a welding strip is welded to the free end of the extension section.

[0007] The present invention utilizes an ultra-thin oxygen-free copper heat pipe as the conductive main grid of the solar cell and also serves as a phase change heat transfer channel. The ultra-thin oxygen-free copper heat pipe is vertically intersected and connected with the fine grids. The current on each fine grid is collected together and transmitted through the ultra-thin oxygen-free copper heat pipe and the welding belt connected to the extension section to realize the function of power generation; the ultra-thin oxygen-free copper heat pipe part on the solar cell serves as the heat pipe evaporation section, and the extension section of the ultra-thin oxygen-free copper heat pipe fixed on the thermally conductive insulating material serves as the heat pipe condensation section. The heat generated during the power generation process of the solar cell is transferred from the heat pipe evaporation section to the heat pipe condensation section and heat conduction is realized through the thermally conductive insulating material, thereby conducting the collected heat energy, improving the power generation efficiency of the battery, and realizing the cogeneration function of the solar cell.

[0008] Preferably, the thermally conductive insulating material is thermally conductive insulating fiberglass cloth.

[0009] Preferably, the welding strip is a tin-coated copper welding strip.

[0010] Preferably, a plurality of ultra-thin oxygen-free copper heat pipes are evenly spaced and arranged in parallel, the width of the ultra-thin oxygen-free copper heat pipe is 2.9±0.05 mm, and the length of the extension section is 15% of the length of the solar cell.

[0011] Preferably, the width of the fine grid is 0.06±0.01 mm, and the spacing between adjacent fine grids is 1±0.5 mm.

[0012] Compared with the shortcomings and deficiencies of the prior art, the present invention has the following beneficial effects:

[0013] The novel cogeneration solar cell provided by the present invention does not need to print silver paste screen on the main grid line on the front side, and no welding strip is used at the main grid line position. Ultra-thin oxygen-free copper heat pipes are used to replace the silver paste screen main grid lines of existing solar cells and the welding strips welded on the main grid lines of the solar cells, which effectively reduces the comprehensive cost of the solar cell. The ultra-thin copper heat pipe is used as the main conductive grid line and phase change heat transfer channel of the solar cell to ensure efficient output of the working power of the solar cell. The part where the ultra-thin copper heat pipe is combined with the solar cell is the evaporation end of the heat pipe. Heat is transferred to the condensation end of the heat pipe and heat conduction is achieved through the horizontally bonded thermally conductive insulating glass fiber cloth, so that the heat generated during the working process of the solar cell can be efficiently utilized, the comprehensive energy output capacity of the solar cell is improved, and the maximum utilization of solar energy is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of a novel cogeneration solar cell provided by an embodiment of the present invention.

[0015] In the figure: 1-battery body; 2-fine grid; 3-ultra-thin oxygen-free copper heat pipe; 4-extension section; 5-thermal conductive insulating material; 6-soldering strip. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0017] Example

[0018] Reference Figure 1A novel cogeneration solar cell comprises a cell body 1, the size of the solar cell used in the cell body 1 is 156mm×156mm, a plurality of fine grids 2 are evenly spaced on the front of the cell body 1, the width of the fine grids 2 is 0.06±0.01mm, and the spacing between adjacent fine grids 2 is 1±0.5mm. Two ultra-thin oxygen-free copper heat pipes 3 are arranged perpendicularly to the fine grids 2 as the main grid of the cell, and the width of the ultra-thin oxygen-free copper heat pipes 3 is 2.9±0.05mm. As shown in the figure, one end of the two ultra-thin oxygen-free copper heat pipes 3 in the same direction is flush with the edge of the solar cell, and the other end extends 20mm from the edge of the solar cell to form an extension section 4 for serial welding connection. The length of the extension section 4 is 15% of the length of the solar cell, which is the best. The length direction of the solar cell here is the same as the length direction of the ultra-thin oxygen-free copper heat pipe 3. A thermally conductive insulating material is bonded to the edge of the solar cell on one side of the extension section 4. The thermally conductive insulating material 5 can be made of thermally conductive insulating fiberglass cloth. The extension section 4 is fixed on the thermally conductive insulating material 5. A welding strip 6 is welded to the free end of the extension section 4. The welding strip 6 is made of a tin-coated copper welding strip with a copper content greater than 99.96%, and its yield strength is 40 to 60 MPa.

[0019] The ultra-thin oxygen-free copper heat pipe in the present invention serves as the main conductive grid line and phase change heat transfer channel of the solar cell, which can not only collect the current on each thin grid and transmit it through the welding belt, but also conduct the heat generated in the power generation process of the solar cell through the thermal conductive insulating material, so as to achieve efficient output of electric energy of the solar cell and efficient utilization of the heat of the cell, improve the comprehensive energy output of the solar cell, and realize the cogeneration function of the solar cell. In addition, the use of ultra-thin oxygen-free copper heat pipes to replace the main grid lines of traditional solar cells and the welding belts on the surface of solar cells can effectively reduce the comprehensive cost of solar cells.

[0020] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A cogeneration solar cell, It is characterized in that It comprises a battery cell body, a plurality of fine grids are evenly distributed on the front side of the battery cell body, an ultra-thin oxygen-free copper heat pipe is arranged to intersect the fine grids perpendicularly, one end of the ultra-thin oxygen-free copper heat pipe is flush with the edge of the solar cell, the other end of the ultra-thin oxygen-free copper heat pipe extends out of the edge of the solar cell to form an extension section, the edge of the solar cell on the side of the extension section is bonded with a thermally conductive insulating material, the extension section is fixed on the thermally conductive insulating material, a welding strip is welded on the free end of the extension section, the part where the ultra-thin oxygen-free copper heat pipe and the battery cell body are combined is an evaporation section, the extension section is a condensation section, heat is transferred to the condensation section of the ultra-thin oxygen-free copper heat pipe and heat conduction is achieved through the thermally conductive insulating material bonded horizontally to the edge of the battery cell; the thermally conductive insulating material adopts a thermally conductive insulating glass fiber cloth, and the welding strip is a tin-coated copper welding strip.

2. The cogeneration solar cell according to claim 1, It is characterized in that A plurality of ultra-thin oxygen-free copper heat pipes are evenly arranged in parallel, the width of the ultra-thin oxygen-free copper heat pipe is 2.9±0.05 mm, and the length of the extension section is 15% of the length of the solar cell.

3. The cogeneration solar cell according to claim 1, It is characterized in that The width of the fine grid is 0.06±0.01 mm, and the spacing between adjacent fine grids is 1±0.5 mm.

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