High-efficiency photovoltaic module

Abstract

The utility model discloses a high-efficiency photovoltaic module which comprises a first battery string, a second battery string, a third battery string, a fourth battery string, a fifth battery string, a sixth battery string, a seventh battery string, an eighth battery string, a ninth battery string, a tenth battery string, an eleventh battery string and a twelfth battery string which are formed by welding a plurality of battery pieces together through a plurality of welding strips. A first bus bar is welded to one side of the first battery string, one side of the third battery string, one side of the fifth battery string, one side of the seventh battery string, one side of the ninth battery string and one side of the eleventh battery string, a second bus bar is welded between the first battery string and the seventh battery string, a second bus bar is welded between the sixth battery string and the seventh battery string, and a third bus bar is welded between the second battery string and the eighth battery string. And a bus bar 3 is welded between the battery string 4 and the battery string 10, and the bus bar is overlapped with the battery pieces, so that the area occupied by the bus bar is reduced, and the conversion efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of photovoltaic module technology, and particularly to a high-efficiency photovoltaic module. Background Technology

[0002] Currently, photovoltaic modules have busbars and cells arranged in parallel, with a spacing of three to ten millimeters between them. This increases the module area, requiring more materials and raising costs. Furthermore, the increased module area also reduces the photovoltaic module's power generation efficiency (module conversion efficiency = module power divided by module area). Therefore, a high-efficiency photovoltaic module is needed. Utility Model Content

[0003] The purpose of this invention is to solve the problem that existing technologies inadvertently reduce the power generation efficiency of photovoltaic modules.

[0004] Therefore, this utility model addresses the aforementioned problem by proposing a high-efficiency photovoltaic module, comprising battery strings 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, and 12, formed by welding multiple battery cells together with multiple solder strips. Battery strings 1, 2, 3, 4, 5, and 6 form one row, which is opposite to the row formed by battery strings 7, 8, 9, 10, 11, and 12, with a spacing of 0mm-4mm between them. A busbar 1 is welded to one side of battery strings 1, 3, 5, 7, 9, and 11; a busbar 2 is welded between battery strings 1 and 7; a busbar 2 is welded between battery strings 6 and 7; a busbar 3 is welded between battery strings 2 and 8; and a busbar 3 is welded between battery strings 4 and 10.

[0005] Preferably, the busbar is divided into two ends. One end of the busbar is located in the middle of the back of the first battery string, and the busbar is welded to the solder strip on the surface of the battery cell. The other end is located in the middle of the front of the second battery string, and the busbar is welded to the solder strip on the front surface of the battery cell. The busbars 1 of the first, third, fifth, seventh, ninth and eleventh battery strings are all of the same type. Therefore, the arrangement of the busbars 1 in the third, fifth, seventh, ninth and eleventh battery strings is the same as that of the busbar 1 in the first battery string, thereby realizing the series welding of two adjacent battery strings.

[0006] Preferably, half of the width of busbar 2 is welded to the solder strip on the front surface of the end cell of battery string 1, and the other half is welded to the solder strip on the front surface of the cell of battery string 7. One end of the busbar in the length direction is bent and extended outside the module, eventually connecting to an external junction box, thus achieving parallel welding of battery strings 1 and 7. Similarly, half of the width of busbar 2 is welded to the solder strip on the front surface of the end cell of battery string 6, and the other half is welded to the solder strip on the front surface of the cell of battery string 12. One end of the busbar in the length direction is bent and extended outside the module, eventually connecting to an external junction box, thus achieving parallel welding of battery strings 1 and 7.

[0007] Preferably, the busbar is divided into two ends. One end of the busbar is located on the back of battery string 2 and battery string 8, and the other end is located on the front of battery string 3 and battery string 9. The busbar is welded together with battery string 2, battery string 8, battery string 3 and battery string 9. The busbar 3 welded between battery string 2 and battery string 8 is the same type of component as the busbar 3 welded between battery string 4 and battery string 10. Therefore, the arrangement of the busbar 3 welded between battery string 4 and battery string 10 is the same as the arrangement of the busbar 3 welded between battery string 2 and battery string 8.

[0008] Beneficial effects: 1. By designing the busbars at both ends of the module to be located in the middle of the solar cells, the distance that the current at both ends of a single solar cell is transmitted to the busbar is shortened, reducing the power loss caused by transmission and effectively improving the output power of the module.

[0009] 2. The busbars of the module are all located on the front or back of the solar cells and overlap with the solar cells. This reduces the area occupied by the busbars and the area occupied by the busbars to the solar cells, ultimately reducing the amount of material used in module production and improving the module's conversion efficiency. Attached Figure Description

[0010] Figure 1 This is a bottom view of the overall structure of this utility model;

[0011] Figure 2 This is a schematic diagram of the existing technology structure;

[0012] Figures 1 to 2 The reference numerals in the attached drawings are as follows: inner shell 1, lead wire 101, outer shell 2, limiting protrusion 201, thin plate 202, chamber 203, conical groove 204, and air inlet 205. Detailed Implementation

[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0014] Reference Figures 1 to 2 A high-efficiency photovoltaic module includes a series of battery strings 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, and 12, formed by welding multiple solar cells together with multiple solder strips. Strings 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, and 12 are arranged in a row with strings 7, 8, 9, 10, and 11. A row of battery strings 1 and 12 is arranged opposite each other with a spacing of 0mm-4mm. One side of battery strings 1, 3, 5, 7, 9 and 11 has a busbar 1 01 welded on it. A busbar 2 02 is welded between battery strings 1 and 7. A busbar 2 02 is welded between battery strings 6 and 7. A busbar 3 03 is welded between battery strings 2 and 8. A busbar 3 03 is welded between battery strings 4 and 10.

[0015] Preferably, the busbar 01 is divided into two ends. One end of the busbar 01 is located in the middle of the back of the battery string 1, and the busbar 01 is welded to the solder strip on the surface of the battery cell. The other end is located in the middle of the front of the battery string 2, and the busbar 01 is welded to the solder strip on the front surface of the battery cell, thus realizing the series welding of two adjacent battery strings. The busbars 01 of battery string 1, battery string 3, battery string 5, battery string 7, battery string 9, and battery string 11 are all homogeneous components. Therefore, the configuration of the busbars 01 in battery string 3, battery string 5, battery string 7, battery string 9, and battery string 11 is also consistent with the configuration of the busbar 01 in battery string 11.

[0016] Preferably, half of the width of busbar 202 is welded to the solder strip on the front surface of the end cell of battery string 1, and the other half is welded to the solder strip on the front surface of the cell of battery string 7, achieving parallel welding of battery string 1 and battery string 7. One end of busbar 202 in the length direction is bent and led out of the module, eventually connecting to an external junction box. Similarly, half of the width of another busbar 202 is welded to the solder strip on the front surface of the end cell of battery string 6, and the other half is welded to the solder strip on the front surface of the cell of battery string 12, achieving parallel welding of battery string 6 and battery string 12. One end of busbar 202 in the length direction is bent and led out of the module, eventually connecting to an external junction box.

[0017] Preferably, the busbar 303 is divided into two ends. One end of the busbar 303 is located on the back of battery string 2 and battery string 8, and the other end is located on the front of battery string 3 and battery string 9. The busbar 303 is welded together with battery string 2, battery string 8, battery string 3, and battery string 9. The busbar 303 welded between battery string 2 and battery string 8 is the same type of component as the busbar 303 welded between battery string 4 and battery string 10. Therefore, the arrangement of the busbar 303 welded between battery string 4 and battery string 10 is the same as the arrangement of the busbar 303 welded between battery string 2 and battery string 8.

[0018] In specific implementation, one end of busbar 01 is located in the middle of the back of battery string 1, and the busbar is welded to the solder strip on the surface of the battery cell; the other end is located in the middle of the front of battery string 2, and the busbar is welded to the solder strip on the front surface of the battery cell. This achieves series welding of two adjacent battery strings. Other busbars 01 are also welded to adjacent battery strings in series according to the above scheme.

[0019] In practice, busbar 202 is located in the middle of the module and is mainly used for parallel welding of the upper and lower battery strings. The distance between the upper and lower battery strings 1 and 7 is 0~4mm. Half of the width of busbar 202 is welded to the welding strip on the front surface of the end cell of battery string 1, and the other half of the width is welded to the welding strip on the front surface of the cell of battery string 7, so as to realize the parallel welding of battery string 1 and battery string 7. One end of the length of busbar 202 is bent out of the module and finally connected to the external junction box.

[0020] In practice, one end of busbar 202 is bent to a height of 150-250 micrometers, and this end is positioned at the center of the front of cell strings 1 and 7. The busbar is then welded to the solder strip on the surface of the cell. The other end extends out from the gap between cell strings 1 and 2 and is bent upwards to a height of 150-250 micrometers. This bent portion is subsequently used for internal and external wiring of the photovoltaic module.

[0021] In practice, busbar 303 is positioned in the center of the module, and its welding to battery strings 2 and 8 is the same as that of busbar 202. After being bent in the middle, busbar 303 is welded to battery strings 3 and 9. One end is bent at a 90-degree angle and then passes through the gap between battery strings 4 and 10, serving as an electrode of the module. The other end is welded to battery strings 2 and 8, and then bent at a 90-degree angle to serve as an electrode. The 90-degree bend height at both ends is 150 micrometers to 250 micrometers.

[0022] In practice, after the busbars and battery strings are welded together, EVA is laid, backsheet is laid, laminated, framed, and junction boxes are installed to complete the assembly.

[0023] Working principle: By designing the busbars at both ends of the module in the middle of the solar cells, the distance that the current from both ends of a single solar cell is transmitted to the busbars is shortened, reducing the power loss caused by transmission and effectively improving the output power of the module.

[0024] Meanwhile, the busbars in the module are all set on the front or back of the solar cells, allowing the busbars to overlap with the solar cells. This reduces the area occupied by the busbars and the area occupied by the busbars to the solar cells, ultimately reducing the amount of material used in module production and improving module conversion efficiency.

[0025] The current mainstream module size in the industry is 2279*1134mm, but this technology can reduce the module size to 2249*1134mm. Due to the reduction in module area, the material cost per module is reduced by 3.2264 yuan, and the module power is 550W. The module efficiency also increases from 21.28% to 21.57% due to the smaller module size. This reduction in module size can also reduce land costs, support structure costs, maintenance costs, and other expenses associated with building a power plant of the same scale.

[0026] The following is a comparison table of the beneficial effects of this utility model and the prior art after use:

[0027]

[0028] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A high-efficiency photovoltaic module, comprising a battery string 1 (1), battery string 2 (2), battery string 3 (3), battery string 4 (4), battery string 5 (5), battery string 6 (6), battery string 7 (7), battery string 8 (8), battery string 9 (9), battery string 10 (10), battery string 11 (11), and battery string 12 (12) formed by welding multiple battery cells together with multiple solder strips, wherein the battery strings 1 (1), 2 (2), 3 (3), 4 (4), 5 (5), and 6 (6) form one row, which is opposite to the row formed by the battery strings 7 (7), 8 (8), 9 (9), 10 (10), 11 (11), and 12 (12), and the spacing between them is 0mm-4mm, characterized in that: Busbar 1 (01) is welded to one side of battery string 1 (1), battery string 3 (3), battery string 5 (5), battery string 7 (7), battery string 9 (9) and battery string 11 (11). Busbar 2 (02) is welded between battery string 1 (1) and battery string 7 (7). Busbar 2 (02) is welded between battery string 6 (6) and battery string 7 (7). Busbar 3 (03) is welded between battery string 2 (2) and battery string 8 (8). Busbar 3 (03) is welded between battery string 4 (4) and battery string 10 (10).

2. The high-efficiency photovoltaic module according to claim 1, characterized in that, The busbar 1 (01) is divided into two ends. One end of the busbar 1 (01) is located in the middle of the back of the battery string 1 (1), and the busbar 1 (01) is welded to the solder strip on the surface of the battery cell. The other end is located in the middle of the front of the battery string 2 (2), and the busbar 1 (01) is welded to the solder strip on the front surface of the battery cell, thus realizing the series welding of two adjacent battery strings. The busbar 1 (01) of the battery string 1 (1), battery string 3 (3), battery string 5 (5), battery string 7 (7), battery string 9 (9) and battery string 11 (11) are all homogeneous components. Therefore, the setting method of the busbar 1 (01) in the battery string 3 (3), battery string 5 (5), battery string 7 (7), battery string 9 (9) and battery string 11 (11) is also consistent with the setting method of the busbar 1 (01) in the battery string 1 (1).

3. The high-efficiency photovoltaic module according to claim 2, characterized in that, Half of the width of the busbar 2 (02) is welded to the solder strip on the front surface of the end cell of the battery string 1 (1), and the other half of the width is welded to the solder strip on the front surface of the battery string 7 (7), so as to realize the parallel welding of the battery string 1 (1) and the battery string 7 (7). One end of the length of the busbar 2 (02) is bent out of the component and finally connected to the external junction box.

4. The high-efficiency photovoltaic module according to claim 2, characterized in that, As described above, half of the width of the busbar 2 (02) is welded to the solder strip on the front surface of the end battery cell of the battery string 6 (6), and the other half of the width is welded to the solder strip on the front surface of the battery cell of the battery string 12 (12), thereby realizing the parallel welding of the battery string 6 (6) and the battery string 12 (12). One end of the length of the busbar 2 (02) is bent out of the component and finally connected to the external junction box.

5. The high-efficiency photovoltaic module according to claim 2, characterized in that, The busbar three (03) is divided into two ends. One end of the busbar three (03) is set on the back of the battery string two (2) and the battery string eight (8), and the other end is set on the front of the battery string three (3) and the battery string nine (9). The busbar three (03) is welded together with the battery string two (2), the battery string eight (8), the battery string three (3), and the battery string nine (9). The busbar three (03) welded between the battery string two (2) and the battery string eight (8) is the same type of component as the busbar three (03) welded between the battery string four (4) and the battery string ten (10). Therefore, the setting method of the busbar three (03) welded between the battery string four (4) and the battery string ten (10) is the same as the setting method of the busbar three (03) welded between the battery string two (2) and the battery string eight (8).

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