Photovoltaic module
By using a whole cell and a half cell in a dislocation in the photovoltaic module to form a series structure, the problem of increasing the module area in the bus bar area is solved and the photoelectric conversion efficiency is improved.
Patent Information
- Application Number
- CN202422625173.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-30
- Publication Date
- 2025-09-02
- Estimated Expiration
- 2034-10-30
Smart Images
Figure CN223297966U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of solar photovoltaic cells, and in particular relates to a photovoltaic component. Background Art
[0002] Photovoltaic modules are devices that encapsulate photovoltaic cells through certain electrical connections. The industry mainstream is half-cell modules, which are modules that cut the entire cell in half and then connect the half-cells in series to form a cell string. The adjacent cell strings are connected by busbars. The busbars of conventional photovoltaic modules are located between the half-cell cells, so the busbar area where the module is installed is not the cell area, which increases the module area. Since the photoelectric conversion efficiency of a photovoltaic module is the ratio of module power to module area, when the module power is constant, the smaller the module area, the higher the module efficiency. Therefore, the busbar area of conventional photovoltaic modules is not the cell area, which affects the photoelectric conversion efficiency of the photovoltaic module. Utility Model Content
[0003] The embodiment of the present invention provides a photovoltaic module, which aims to reduce the area of the non-cell region of the module, thereby reducing the module area, thereby improving the photoelectric conversion efficiency of the module.
[0004] To achieve the above object, the technical solution adopted by the present invention is as follows: providing a photovoltaic module, comprising: a plurality of series-connected sub-units, each of the series-connected sub-units comprising a first battery string and a second battery string, the second battery string comprising a plurality of second half-cells connected in series;
[0005] The first battery string includes a central full-sheet battery cell and a plurality of first half-sheet battery cells connected in series symmetrically on both sides of the central full-sheet battery cell. After the first half-sheet battery cells and the central full-sheet battery cell are connected in series, the first half-sheet battery cells symmetrically on both sides of the central full-sheet battery cell are sequentially moved closer to the center and staggered with the second half-sheet battery cells, so that the length of the first battery string is shorter than the length of the second battery string.
[0006] The front welding strips at both ends of the first battery string are respectively led out from the front to the blank areas at the ends formed after the misalignment, and the two ends of the first battery string are connected in series with the two ends of the second battery string through end bus bars, and the end bus bars directly connect the front welding strip led out from the front of the first battery string with the back welding strip of the second battery string; adjacent series sub-units are connected through a middle bus bar, and the middle bus bar connects the front welding strip led out from the front of the first battery string with the back welding strip of the adjacent second battery string.
[0007] In one achievable manner, a plurality of the series-connected sub-units are arranged side by side, so that the first battery string and the second battery string are alternately arranged in sequence.
[0008] In one achievable manner, the length of the front welding strips at both ends of the first battery string is flush with the end bus bar.
[0009] In one achievable manner, in the first battery string, the front welding ribbon of the middle full battery cell is connected to the back welding ribbon of the first half battery cell.
[0010] In one feasible manner, in the second battery string, a central blank area is formed between the two central second half battery cells to avoid the central bus bar, and the front welding strips of the two central second half battery cells are led out to the central blank area.
[0011] In one achievable manner, a width W of the middle blank area along the length direction of the second battery string is 10-30 mm.
[0012] In one achievable manner, the central bus bar is located in the middle of the central blank area.
[0013] In one achievable manner, the middle blank area is formed between the two non-cut edges of the second half battery cells in the middle.
[0014] Compared with the prior art, the photovoltaic module provided by the present invention has the following beneficial effects: the middle cell in a string of cells uses a whole cell without slices, and there will be gaps between the sliced half-cells. Therefore, the length of the complete whole cell is shorter than the length of the two half-cells in series after slices, so that the length of the first cell string with whole cells is shorter than the length of the second cell string with all sliced cells, thereby reducing the module area and thus improving the module efficiency; when multiple series sub-units are connected in series, the module area is reduced more accordingly, so that the module efficiency is improved more significantly. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 A schematic diagram of the exploded structure of a photovoltaic module provided by an embodiment of the present utility model;
[0016] Figure 2 for Figure 1 Schematic diagram of the local enlarged structure at A in the middle;
[0017] Figure 3 for Figure 1 Schematic diagram of the local enlarged structure at B in the middle;
[0018] Description of reference numerals:
[0019] 1. Series sub-units; 11. First battery string; 111. End blank area; 112. First half battery cell; 113. Middle whole battery cell; 12. Second battery string; 121. Second half battery cell; 122. Middle blank area; 2. End bus bars; 3. Front glass; 4. Middle bus bar. DETAILED DESCRIPTION
[0020] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to 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.
[0021] In this application, terms such as "first" and "second" are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship of quantity, priority or sequence between these entities or operations.
[0022] Consistent with the understanding in the Examination Guidelines, in this application, expressions such as "greater than," "less than," and "exceed" are understood to exclude the number itself; expressions such as "above," "below," and "within" are understood to include the number itself. Furthermore, in the description of the embodiments of this application, "multiple" means more than two (including two), and similar expressions related to "multiple" are also understood in this manner, such as "multiple groups," "multiple times," etc., unless otherwise specifically defined.
[0023] Please also refer to Figures 1 to 3The photovoltaic module provided by the present invention is now described. The photovoltaic module includes a plurality of series-connected sub-units 1, each of which includes a first battery string 11 and a second battery string 12, wherein the second battery string 12 includes a plurality of second half-cells 121 connected in series; the first battery string 11 includes a central full-cell 113 in the middle and a plurality of first half-cells 112 connected in series symmetrically on both sides of the central full-cell 113; after the first half-cells 112 and the central full-cell 113 are connected in series, the first half-cells 112 symmetrically on both sides of the central full-cell 113 move closer to the middle in sequence and are staggered with the second half-cells 121 to form the first half-cell. The length of the cell string 11 is shorter than the length of the second cell string 12; the front welding strips at both ends of the first cell string 11 are respectively led out from the front to the end blank area 111 formed after the misalignment, and the two ends of the first cell string 11 and the two ends of the second cell string 12 are connected in series through the end bus bar 2, and the end bus bar 2 directly connects the front welding strip led out from the front of the first cell string 11 with the back welding strip of the second cell string 12 to form an electrical connection; the adjacent series sub-units 1 are connected through the middle bus bar 4, and the middle bus bar 4 connects the front welding strip led out from the front of the first cell string 11 with the back welding strip of the adjacent second cell string 12 to form an electrical connection.
[0024] Compared with the prior art, the photovoltaic module provided by the present invention has the following beneficial effects: the middle cell in a string of cells uses a whole cell without slices, and there will be gaps between the sliced half-cells. Therefore, the length of the complete whole cell is shorter than the length of the two half-cells in series after slices, so that the length of the first cell string 11 with whole cells is shorter than the length of the second cell string 12 with all sliced cells, thereby reducing the module area and thus improving the module efficiency; when multiple series sub-units 1 are connected in series, the module area is reduced more accordingly, so that the module efficiency is improved more significantly.
[0025] Since the middle portion of the first battery string 11 uses a whole battery cell, the battery cell corresponding to the middle portion of the second battery string 12 is two half-battery cells. Therefore, starting from the middle portions of the first battery string 11 and the second battery string 12, the first half-battery cell 112 and the second half-battery cell 121 are sequentially offset, thereby forming end blank areas 111 at both ends of the first battery string 11, i.e., the reduced area of the component.
[0026] The first half of the cells 112 in the first cell string 11 are connected in series in a conventional manner, and the second half of the cells 121 in the second cell string 12 are also connected in series in a conventional manner. Each series sub-unit 1 is applied to the front glass 3 with an adhesive film.
[0027] It should be explained that the length referred to in this article is the length in the direction of series connection of the battery string, and the middle refers to the middle position of the length.
[0028] In some embodiments, see Figure 1 As shown, multiple series subunits 1 are arranged side by side, such that multiple first battery strings 11 and multiple second battery strings 12 are alternately arranged. End blank areas 111 are also formed at both ends of the battery strings in an alternating arrangement. The illustration provided in this application includes three series subunits 1, each of which includes two battery strings, for a total of six battery strings. In other embodiments, four or five series subunits 1 can be connected in series, depending on design requirements.
[0029] In some embodiments, see Figure 1 and Figure 2 As shown, the front welding strips at both ends of the first battery string 11 are extended to a length flush with the end bus bar 2 , so that the front welding strips and the end bus bar 2 are reliably welded.
[0030] In some embodiments, see Figure 1 As shown, in the first battery string 11, the front-side solder ribbon of the middle full-cell 113 is connected to the back-side solder ribbon of the first half-cell 112. The edges of the middle full-cell 113 are all raw edges, while the first half-cell 112 has a notch. When connected in series, both the full-cell and half-cell are arranged with the raw edges adjacent to the notched edges, and the front-side solder ribbon is connected to the back-side solder ribbon.
[0031] In some embodiments, see Figure 1 and Figure 3 As shown, in the second battery string 12 , a central blank area 122 for avoiding the central bus bar 4 is formed between the two central second half-cells 121 , and the front welding strips of the two central second half-cells 121 are led out to the central blank area 122 .
[0032] In some embodiments, see Figure 1 and Figure 3 As shown, the width W of the middle blank area 122 along the length direction of the second battery string 12 is 10-30 mm. This application is for a busbar for a photovoltaic module. The size of the busbar varies according to the application. For example, the common sizes of photovoltaic module busbars include 4 mm. 2 , 6mm 2 , 10mm 2 ; When producing split photovoltaic modules, bus bars of two sizes (for example, 6mm-8mm width and 3mm-4mm width) are required.
[0033] In some embodiments, see Figure 1 and Figure 3 As shown, the middle bus bar 4 is located in the middle of the middle blank area 122 so that the connection lengths between the welding strips of the two half-cells and the middle bus bar 4 are consistent, thereby improving the reliability of the connection.
[0034] In some embodiments, see Figure 1 and Figure 3 As shown, a central blank area 122 is formed between the non-cut edges (i.e., original edges) of the two second half-cells 121 in the middle. From the two second half-cells 121 in the middle to both sides, each half-cell is arranged in series with the original edges and the cut edges adjacent.
[0035] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant description of other embodiments.
[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.
Claims
1. A photovoltaic module, characterized in that: include: A plurality of series-connected subunits (1), each of the series-connected subunits (1) comprising a first battery string (11) and a second battery string (12), the second battery string (12) comprising a plurality of second half-cell battery cells (121) connected in series; The first battery string (11) comprises a middle full-piece battery cell (113) in a middle position and a plurality of first half-piece battery cells (112) connected in series symmetrically on both sides of the middle full-piece battery cell (113); after the first half-piece battery cell (112) and the middle full-piece battery cell (113) are connected in series, the first half-piece battery cells (112) symmetrically on both sides of the middle full-piece battery cell (113) are successively moved closer to the middle and are staggered with the second half-piece battery cells (121), so that the length of the first battery string (11) is shorter than the length of the second battery string (12); The front welding strips at both ends of the first battery string (11) are respectively led out from the front to the end blank area (111) formed after the misalignment, and the two ends of the first battery string (11) and the two ends of the second battery string (12) are connected in series through an end bus bar (2), and the end bus bar (2) directly connects the front welding strip led out from the front of the first battery string (11) with the back welding strip of the second battery string (12); adjacent series subunits (1) are connected through a middle bus bar (4), and the middle bus bar (4) connects the front welding strip led out from the front of the first battery string (11) with the back welding strip of the adjacent second battery string (12).
2. The photovoltaic module according to claim 1, wherein The plurality of series-connected subunits (1) are arranged side by side so that the first battery strings (11) and the second battery strings (12) are arranged alternately in sequence.
3. The photovoltaic module according to claim 1, wherein: The length of the front welding strips at both ends of the first battery string (11) is flush with the end bus bar (2).
4. The photovoltaic module according to claim 1, wherein: In the first battery string (11), the front welding strip of the middle full battery cell (113) is connected to the back welding strip of the first half battery cell (112).
5. The photovoltaic module according to claim 1, wherein: In the second battery string (12), a central blank area (122) is formed between the two central second half battery cells (121) to avoid the central bus bar (4), and the front welding strips of the two central second half battery cells (121) are led out to the central blank area (122).
6. The photovoltaic module according to claim 5, wherein: The width W of the middle blank area (122) along the length direction of the second battery string (12) is 10-30 mm.
7. The photovoltaic module according to claim 5, wherein: The central bus bar (4) is located in the middle of the central blank area (122).
8. The photovoltaic module according to claim 5, wherein: The middle blank area (122) is formed between the non-cut edges of the two second half battery slices (121) in the middle.