A double-sided double-glass photovoltaic module

Abstract

The present invention provides a double-sided double-glass photovoltaic module, belonging to the field of semiconductor technology. It solves the technical problems that the reflective film of the existing double-sided double-glass photovoltaic module will soften under long-term sunlight exposure. The double-sided double-glass photovoltaic module includes two high-transmittance glasses, a plurality of battery strings arranged between the two high-transmittance glasses, and a buffer layer arranged between the plurality of battery strings and the high-transmittance glasses. The upper and lower sides of the battery string are provided with a plurality of reflective welding strips with triangular cross-sections. The upper and lower sides of two adjacent battery cells are overlapped by the bottom surfaces of the corresponding reflective welding strips. The other two sides of the reflective welding strips are both reflective surfaces. The two reflective welding strips are welded together by solder. The high-transmittance glass on the back of the battery string is provided with a plurality of reflective strips, and the plurality of reflective strips are respectively opposite to the gaps between the battery strings and the gaps between the battery cells. The present invention has the advantage of fully utilizing light energy to convert into electrical energy.

Description

Technical Field

[0001] The invention belongs to the technical field of semiconductors and relates to a double-sided double-glass photovoltaic module. Background Art

[0002] At present, it is increasingly difficult to improve the efficiency of photovoltaic modules by improving the efficiency of cells. Huge investments often result in small improvements. Therefore, it is crucial to improve the efficiency of modules in an effective way. Improving the efficiency of modules is of great significance to reducing the cost of electricity and achieving grid parity.

[0003] For example, a double-sided double-glass photovoltaic module disclosed in Chinese patent document [CN207542258U] includes a rolled tempered glass, a first transparent packaging film, a double-sided battery string, a second transparent packaging film and a rolled glass arranged in sequence from top to bottom; the double-sided battery string is composed of a plurality of battery cells connected by a welding ribbon, and a reflective film is affixed to the surface of the welding ribbon; a junction box is installed on the back of the module, and a reflective film is affixed to the surface of the welding ribbon, and the upper surface of the reflective film is a pyramid structure.

[0004] Although the above-mentioned photovoltaic module can refract the sunlight entering the rolled tempered glass to the bottom of the reflective film using the pyramid structure of the reflective film, the reflective film itself is relatively soft in texture. Under long-term exposure to sunlight, the reflective film may soften and lose the function of reflecting sunlight. Summary of the invention

[0005] The purpose of the present invention is to address the above-mentioned problems in the prior art and to propose a double-sided double-glass photovoltaic module. The technical problem solved by the present invention is how to fully utilize the conversion of light energy into electrical energy.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] A double-sided double-glass photovoltaic module, comprising two pieces of high-transmittance glass, a plurality of battery strings arranged between the two pieces of high-transmittance glass, and a buffer layer arranged between the plurality of battery strings and the high-transmittance glass, wherein the plurality of battery strings are each composed of a plurality of battery cells, and there are gaps between adjacent battery cells and between adjacent battery strings, and characterized in that the upper and lower side surfaces of the battery string are each provided with a plurality of reflective welding strips with triangular cross-sections, one side of the reflective welding strips being a bottom surface, the upper and lower side surfaces of two adjacent battery cells are both overlapped by the bottom surfaces of the corresponding reflective welding strips, and the remaining two side surfaces of the reflective welding strips are both reflective surfaces, and the two reflective welding strips located on the front and back sides of the battery cell and opposite to each other are welded together by solder filled in the gap between the two adjacent battery cells, and the high-transmittance glass located on the back side of the battery string is provided with a plurality of reflective strips, and the plurality of reflective strips are respectively opposite to the gaps between the battery strings and the gaps between the battery cells.

[0008] The reflective welding tape itself has a reflective effect, which will reflect the sunlight shining into the high-transmittance glass on the front side to the battery string, so as to make full use of the sunlight shining between the battery strings and improve the power generation efficiency; the solder between the battery cells can weld the reflective welding tape overlapping the front and back sides of the battery cells together, so as to ensure that the reflective welding tape can be firmly fixed on the battery cells, so as to ensure that the two reflective surfaces of the reflective welding tape can always face the sunlight and reflect the sunlight to the battery cells; because there will be gaps between the battery strings, this will cause sunlight to pass through these gaps, and the reflective tape can reflect the sunlight passing through the gaps back to the high-transmittance glass on the front side of the battery panel, and then reflect it onto the battery panel, so as to make full use of the sunlight and improve the power generation efficiency.

[0009] In the above-mentioned double-sided double-glass photovoltaic module, the reflective welding tape is overlapped at the middle position between two adjacent cells, and reflective films are provided on both sides of the reflective welding tape between the two adjacent cells, and the two side surfaces of the reflective films are flush with the two side surfaces of the cells. Since the cells are light in weight, there is no need for too much reflective welding tape to overlap two adjacent cells, so that there is a gap on both sides of the reflective welding tape to allow sunlight to leak to the high-transmittance glass on the back of the cells, and the reflective film can block the gap between the cells, so that the sunlight can be fully utilized and the power generation efficiency can be improved.

[0010] In the above-mentioned double-sided double-glass photovoltaic module, the widths of the two reflective surfaces on the reflective welding tape are the same, and the angle between the two reflective surfaces and the bottom surface ranges from 30° to 60°. This angle can reflect the sunlight directly from the high-transmittance glass above the battery cell to the battery cell through the reflective welding tape at this angle with the greatest efficiency, thereby making full use of the sunlight irradiated between the battery strings and improving the power generation efficiency.

[0011] In the above-mentioned double-sided double-glass photovoltaic module, the cell is provided with a plurality of through holes, which are arranged in an array, and the total area of ​​the plurality of through holes on the cell accounts for half of the surface area of ​​a single cell. Compared with the traditional whole-cell technology, the half-cell technology reduces the area of ​​a single cell by half, and after the module is made, the current is reduced to half of the original, and the resistance loss is reduced from I / O of the whole-cell module to I / O of the whole-cell module. 2 R is reduced to 0.25I 2 R, the overall output power of the component can be increased by 2%, thereby improving power generation efficiency.

[0012] In the above-mentioned double-sided double-glass photovoltaic module, the high-transmittance glass has a plurality of junction boxes arranged in a row in the middle of the plurality of battery strings, the arrangement direction of the junction boxes is the same as the arrangement direction of the battery strings, and the interval between the two battery strings in contact with the junction boxes is greater than the interval between the remaining adjacent battery strings. Placing the junction box in the middle of the module can effectively reduce the resistance of the battery cell when transmitting current, thereby improving the power generation efficiency.

[0013] In the above-mentioned double-sided double-glass photovoltaic module, a plurality of the reflective tapes are cross-distributed in a grid-like manner between the lower glass plate and the battery string, and the mesh size formed by the plurality of grid-like reflective tapes is greater than or equal to the bottom surface area of ​​the battery cell. The above-mentioned structure can prevent the reflective tape from blocking the back of the battery cell and affecting the back power generation efficiency of the battery cell.

[0014] Compared with the prior art, the double-sided double-glass photovoltaic module has the advantage of being able to fully utilize light energy to convert into electrical energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a front view structural schematic diagram of the double-sided double-glass photovoltaic module.

[0016] Figure 2 It is a partial enlarged structural schematic diagram of the double-sided double-glass photovoltaic module.

[0017] Figure 3 It is a schematic diagram of the specific structure of the battery cell in the double-sided double-glass photovoltaic module.

[0018] In the figure, 1. high-transmittance glass; 2. buffer layer; 3. battery string; 30. battery cell; 31. through hole; 4. reflective welding tape; 40. reflective surface; 41. bottom surface; 5. reflective tape; 6. junction box. DETAILED DESCRIPTION

[0019] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0020] like Figure 1 , Figure 2 and Figure 3As shown, the double-sided double-glass photovoltaic module includes two high-transmittance glasses 1, a plurality of battery strings 3 arranged between the two high-transmittance glasses 1, and a buffer layer 2 arranged between the plurality of battery strings 3 and the high-transmittance glass 1. The plurality of battery strings 3 are composed of a plurality of battery cells. The battery cells 30 are provided with a plurality of through holes 31, which are arranged in an array. The total area of ​​the plurality of through holes 31 on the battery cells 30 accounts for half of the upper surface area of ​​a single battery cell 30. The high-transmittance glass 1 is provided with a plurality of junction boxes 6 arranged in a row in the middle of the plurality of battery strings 3. The arrangement direction of the junction boxes 6 is the same as that of the battery strings 3. The interval between the two battery strings 3 in contact with the junction boxes 6 is greater than the interval between the other adjacent battery strings 3. The buffer layer 2 is made of EVA material, POE material or PVB material. In this embodiment, the buffer layer 2 is made of EVA material.

[0021] like Figure 1 and Figure 2 As shown, there are gaps between adjacent battery cells and between adjacent battery strings 3, and the upper and lower sides of the battery string 3 are provided with a plurality of reflective welding strips 4 with triangular cross-sections, one side of the reflective welding strip 4 is a bottom surface 41, and the upper and lower sides of two adjacent battery cells are overlapped by the corresponding bottom surface 41 of the reflective welding strip 4, and the other two sides of the reflective welding strip 4 are reflective surfaces 40, and the two reflective welding strips 4 located on the front and back sides of the battery cell and opposite to each other are welded together through the solder filled in the gap between the two adjacent battery cells, and the reflective welding strip 4 is overlapped at the middle position between the two adjacent battery cells, and reflective films are provided on both sides of the reflective welding strip 4 between the two adjacent battery cells, and the two sides of the reflective film are flush with the two sides of the battery cell, and the two reflective surfaces 40 on the reflective welding strip 4 have the same width, and the angle between the two reflective surfaces 40 and the bottom surface 41 ranges from 30° to 60°. In this embodiment, the angle between the two reflective surfaces 40 and the bottom surface 41 is 60°.

[0022] like Figure 1 and Figure 2 As shown, the high-transmittance glass 1 located on the back side of the battery string 3 has a plurality of reflective tapes 5, and the plurality of reflective tapes 5 are respectively opposite to the gaps between the battery strings 3 and the gaps between the battery cells. The plurality of reflective tapes 5 are cross-distributed in a grid pattern between the lower glass plate and the battery string 3, and the mesh size formed by the plurality of grid-shaped reflective tapes 5 is greater than or equal to the area size of the bottom surface 41 of the battery cell 30.

[0023] The reflective welding tape 4 itself has a reflective effect, and will reflect the sunlight shining into the front high-transmittance glass 1 onto the battery string 3, so as to make full use of the sunlight shining between the battery strings 3 and improve the power generation efficiency; the solder between the battery cells can weld the reflective welding tape 4 overlapped on the front and back of the battery cells together, so as to ensure that the reflective welding tape 4 can be firmly fixed on the battery cells, so as to ensure that the two reflective surfaces 40 of the reflective welding tape 4 can always face the sunlight and reflect the sunlight onto the battery cells; because there will be gaps between the battery strings 3, this will cause sunlight to pass through these gaps, and the reflective tape 5 can reflect the sunlight passing through the gaps back to the high-transmittance glass 1 on the front of the battery panel, and then reflect it onto the battery panel, so as to make full use of the sunlight and improve the power generation efficiency.

[0024] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A double-sided double-glass photovoltaic module, comprising two high-transmittance glasses, a plurality of battery strings arranged between the two high-transmittance glasses, and a buffer layer arranged between the plurality of battery strings and the high-transmittance glasses, wherein the plurality of battery strings are each composed of a plurality of battery cells, and there are gaps between adjacent battery cells and adjacent battery strings, characterized in that: The upper and lower side surfaces of the battery string are provided with a plurality of reflective welding strips with triangular cross-sections, one of the sides of the reflective welding strips is the bottom surface, the upper and lower side surfaces of two adjacent battery cells are overlapped by the bottom surfaces of the corresponding reflective welding strips, and the other two side surfaces of the reflective welding strips are both reflective surfaces, and the two reflective welding strips located on the front and back sides of the battery cell and opposite to each other are welded together by the solder filled in the gap between the two adjacent battery cells, and the high-transmittance glass located on the back side of the battery string is provided with a plurality of reflective strips, and the plurality of reflective strips are respectively opposite to the gap between the battery strings and the gap between the battery cells; the reflective welding strip is overlapped at the middle position between the two adjacent battery cells, and reflective films are provided on both sides of the reflective welding strip between the two adjacent battery cells, and the two side surfaces of the reflective film are flush with the two side surfaces of the battery cell.

2. The double-sided double-glass photovoltaic module according to claim 1, characterized in that: The two reflective surfaces on the reflective welding strip have the same width, and the angle between the two reflective surfaces and the bottom surface is in the range of 30°-60°.

3. The double-sided double-glass photovoltaic module according to claim 1, characterized in that: The battery cell is provided with a plurality of through holes, which are arranged in an array, and the total area of ​​the plurality of through holes on the battery cell accounts for half of the upper surface area of ​​a single battery cell.

4. The double-sided double-glass photovoltaic module according to claim 1, characterized in that: The high-transmittance glass has a plurality of junction boxes arranged in a row in the middle of the plurality of battery strings. The arrangement direction of the junction boxes is the same as that of the battery strings. The interval between two battery strings in contact with the junction boxes is greater than the interval between the remaining adjacent battery strings.

5. The double-sided double-glass photovoltaic module according to claim 1, characterized in that: A plurality of the reflective tapes are cross-distributed in a grid pattern between the lower glass plate and the battery string, and the mesh size formed by the plurality of reflective tapes in a grid pattern is greater than or equal to the bottom surface area of ​​the battery sheet.

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