Photovoltaic modules, crystalline silicon solar cells and crystalline silicon solar cell screens

Abstract

The present application discloses a photovoltaic module, a crystalline silicon solar cell, and a crystalline silicon solar cell screen. The photovoltaic module includes a plurality of cell strings, the plurality of cell strings form a parallelogram structure, and each cell string is a parallelogram structure; each cell string includes a plurality of crystalline silicon cell units in a parallelogram structure or a trapezoidal structure, and the crystalline silicon cell units are formed by connecting crystalline silicon cells; the crystalline silicon cell is a triangular structure, and its light-receiving surface includes a main grid line and a fine grid line, and its backlight surface includes a back electrode. The above technical solution disclosed in the present application arranges the crystalline silicon cells into a triangular structure and connects them to obtain crystalline silicon cell units in a parallelogram structure or a trapezoidal structure, and obtains a cell string in a parallelogram structure, and splices the plurality of cell strings into a parallelogram structure to avoid the existence of blank areas in the photovoltaic module as much as possible, so that the photovoltaic module can be better applied in BIPV photovoltaic curtain walls.

Description

Technical Field

[0001] The present application relates to the technical field of integrated photovoltaic construction, and more specifically, to a photovoltaic module, a crystalline silicon solar cell, and a crystalline silicon solar cell screen. Background Art

[0002] Building Integrated Photovoltaic (BIPV) is the process of integrating photovoltaic products into buildings so that they can not only meet construction requirements but also have the characteristics of power generation and aesthetics.

[0003] Considering that BIPV photovoltaic curtain walls are mostly polygonal in shape, parallelogram-shaped photovoltaic modules are often used in BIPV photovoltaic curtain walls. Currently, conventional rectangular-shaped crystalline silicon cells are commonly used to prepare parallelogram-shaped photovoltaic modules. However, since the photovoltaic cell strings in the photovoltaic modules need to meet current matching (the area of ​​each crystalline silicon cell must be the same, and the number of crystalline silicon cells contained in each photovoltaic cell string must be the same), the arrangement of the crystalline silicon cells will result in blank spaces near the two acute angles of the parallelogram. For details, see Figure 1 and Figure 2 ,in, Figure 1 shows a schematic diagram of an existing parallelogram photovoltaic module, Figure 2 The schematic diagram of the structure of the existing crystalline silicon cell is shown. Currently, the blank areas of the parallelogram photovoltaic module are generally left blank or filled with a color and image similar to the crystalline silicon cell, which cannot be used to generate electricity.

[0004] In summary, how to avoid blank areas in photovoltaic modules as much as possible so that the photovoltaic modules can better match the BIPV photovoltaic curtain wall is a technical problem that needs to be urgently solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the purpose of this application is to provide a photovoltaic module, a crystalline silicon solar cell and a crystalline silicon solar cell screen, which are used to avoid the existence of blank areas in the photovoltaic module as much as possible, so that the photovoltaic module can be better matched with the BIPV photovoltaic curtain wall.

[0006] In order to achieve the above objectives, this application provides the following technical solutions:

[0007] A photovoltaic module comprises a plurality of battery strings, wherein:

[0008] The plurality of battery strings form a parallelogram structure and each of the battery strings has a parallelogram structure;

[0009] Each of the battery strings includes a plurality of crystalline silicon battery units in a parallelogram structure or a trapezoidal structure, and the crystalline silicon battery unit is formed by connecting a preset number of crystalline silicon batteries;

[0010] The crystalline silicon cell has a triangular structure, wherein the light-receiving surface of the crystalline silicon cell includes main grid lines located on the three sides of the triangular structure and multiple fine grid lines intersecting with the main grid lines; the backlight surface of the crystalline silicon cell includes back electrodes located on the three sides of the triangular structure.

[0011] Preferably, the fine gate lines include a plurality of first fine gate lines parallel to one of the main gate lines and a plurality of second fine gate lines perpendicular to the first fine gate lines.

[0012] Preferably, the crystalline silicon cells in the crystalline silicon cell unit are connected in a shingled form.

[0013] Preferably, the crystalline silicon cells in the crystalline silicon cell unit are connected to each other via conductive glue.

[0014] Preferably, the crystalline silicon cell is a double-sided crystalline silicon cell capable of generating electricity on both the light-receiving side and the backlight side.

[0015] Preferably, the crystalline silicon cell is an isosceles right triangle structure.

[0016] A crystalline silicon solar cell, wherein the crystalline silicon solar cell has a rectangular structure, wherein:

[0017] The surface of the crystalline silicon solar cell comprises a plurality of triangular regions of the same shape, and the triangular regions are used to obtain the crystalline silicon cells included in any one of the photovoltaic modules described above by cutting along their edges.

[0018] Preferably, the crystalline silicon solar cell has a square structure.

[0019] A crystalline silicon solar cell mesh is used to prepare the crystalline silicon solar cell as described above. The crystalline silicon solar cell mesh includes multiple triangular mesh areas of the same shape and is used to prepare the crystalline silicon cells included in the photovoltaic module as described above.

[0020] The present application provides a photovoltaic module, a crystalline silicon solar cell and a crystalline silicon solar cell screen, wherein the photovoltaic module includes multiple cell strings, wherein: the multiple cell strings form a parallelogram structure and each cell string has a parallelogram structure; each cell string includes multiple crystalline silicon cell units in a parallelogram structure or a trapezoidal structure, and the crystalline silicon cell unit is formed by connecting a preset number of crystalline silicon cells; the crystalline silicon cell has a triangular structure, wherein the light-receiving surface of the crystalline silicon cell includes main grid lines located on three sides of the triangular structure and multiple fine grid lines intersecting with the main grid lines; the backlight surface of the crystalline silicon cell includes back electrodes located on three sides of the triangular structure.

[0021] The above-mentioned technical solution disclosed in the present application sets the crystalline silicon cells in the photovoltaic module into a triangular structure, and connects the crystalline silicon cells in the triangular structure using the main grid lines and back electrodes located at the edge positions to obtain crystalline silicon cell units with a parallelogram structure or a trapezoidal structure, and splices the crystalline silicon cell units into a cell string with a parallelogram structure, and splices multiple cell strings into a parallelogram structure to avoid as much as possible the existence of blank areas in the photovoltaic module with a parallelogram structure, so that the photovoltaic module with a parallelogram structure can be better used in the BIPV photovoltaic curtain wall to increase the power generation of the BIPV photovoltaic curtain wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without any creative work.

[0023] Figure 1 is a schematic diagram of an existing parallelogram photovoltaic module;

[0024] Figure 2 It is a structural diagram of an existing crystalline silicon battery;

[0025] Figure 3 A schematic structural diagram of a photovoltaic module provided in an embodiment of the present application;

[0026] Figure 4 A schematic structural diagram of a crystalline silicon battery cell provided in an embodiment of the present application;

[0027] Figure 5 A schematic diagram of the structure of a crystalline silicon cell provided in an embodiment of the present application;

[0028] Figure 6 A schematic diagram of a pattern formed by splicing the photovoltaic modules provided in this application, provided in an embodiment of this application;

[0029] Figure 7 A schematic structural diagram of a crystalline silicon solar cell provided in an embodiment of the present application;

[0030] Figure 8 A framework diagram of a crystalline silicon solar cell screen provided in an embodiment of the present application. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0032] See also Figures 3 to 5 ,in, Figure 3 A schematic structural diagram of a photovoltaic module provided in an embodiment of the present application is shown. Figure 4 The structure diagram of a crystalline silicon battery cell provided in an embodiment of the present application is shown. Figure 5 A photovoltaic module provided by an embodiment of the present application may include a plurality of cell strings 1, wherein:

[0033] The plurality of battery strings 1 form a parallelogram structure and each battery string 1 has a parallelogram structure;

[0034] Each battery string 1 may include a plurality of crystalline silicon battery units 11 in a parallelogram structure or a trapezoidal structure, and the crystalline silicon battery unit 11 is formed by connecting a preset number of crystalline silicon cells 111;

[0035] The crystalline silicon cell 111 has a triangular structure, wherein the light-receiving surface of the crystalline silicon cell 111 may include the main grid lines 10 located on the three sides of the triangular structure and multiple fine grid lines 20 intersecting with the main grid lines 10; the backlight surface of the crystalline silicon cell 111 may include the back electrodes located on the three sides of the triangular structure.

[0036] Taking into account the existing use of conventional crystalline silicon cells to prepare parallelogram-structured photovoltaic modules, when the photovoltaic modules are applied to polygonal BIPC photovoltaic curtain walls, blank areas that are not filled with crystalline silicon cells will be left inside the parallelogram-structured photovoltaic modules, and the existence of these blank areas will not only reduce the power generation of the BIPV photovoltaic curtain wall, but also reduce the visual effect of the BIPV photovoltaic curtain wall. For this reason, the present application provides a photovoltaic module, wherein the crystalline silicon cells 111 contained in the photovoltaic module adopt a triangular structure, so that a preset number of triangular-structured crystalline silicon cells 111 are spliced ​​together to obtain a photovoltaic module. The crystalline silicon battery unit 11 with a parallelogram structure or a trapezoidal structure is obtained by splicing the crystalline silicon battery unit 11 with a parallelogram structure or a trapezoidal structure to obtain a battery string 1 with a parallelogram structure, and multiple battery strings 1 with a parallelogram structure are arranged and connected in parallel to make these battery strings 1 have a parallelogram structure, thereby avoiding the existence of blank areas in the photovoltaic module as much as possible, so that the photovoltaic module with a parallelogram structure can be better used in the BIPV photovoltaic curtain wall, thereby increasing the power generation of the BIPV photovoltaic curtain wall, and improving the aesthetics and visual effects of the BIPV photovoltaic curtain wall. It should be noted that Figure 4 The description is made by taking the crystalline silicon battery unit 11 having a parallelogram structure and including two triangular crystalline silicon batteries 111 as an example. Of course, other numbers of triangular crystalline silicon batteries 111 can also be used to form a parallelogram structure or a trapezoidal structure crystalline silicon battery unit 11.

[0037] Since the parallelogram-shaped photovoltaic modules can form more patterns, the application of the photovoltaic modules provided by this application in the BIPV photovoltaic curtain wall can not only improve the power generation of the BIPV photovoltaic curtain wall, but also make the BIPV photovoltaic curtain wall have richer patterns, thereby improving the aesthetics of the BIPV photovoltaic curtain wall. For details, please refer to Figure 6 , which shows a schematic diagram of a pattern spliced ​​together using the photovoltaic components provided in the present application, provided in an embodiment of the present application, wherein (a)-(g) respectively represent different patterns obtained by splicing. Of course, more patterns can be spliced ​​together, and the present application does not impose any limitation on this.

[0038] In the photovoltaic module provided in the present application, the area and shape of each crystalline silicon battery unit 11 contained in each battery string 1 are equal, the area and number of crystalline silicon batteries 111 contained in each crystalline silicon battery unit 11 are equal, and the number of crystalline silicon battery units 11 contained in each battery string 1 is the same, so as to achieve current matching of the photovoltaic module.

[0039] In addition, in the photovoltaic module provided by the present application, the light-receiving surface (i.e., the side that directly receives sunlight) of the triangular-structured crystalline silicon cell 111 contained therein includes main grid lines 10 located on the three sides of the triangular structure, and its light-receiving surface also includes fine grid lines 20 intersecting with the main grid lines 10, and its backlight surface includes back electrodes located on the three sides of the triangular structure, wherein a plurality of fine grid lines 20 are used to collect carriers generated at various positions inside the crystalline silicon cell 111 when illuminated, and transfer the collected carriers to the main grid lines 10 connected thereto, so as to facilitate the transfer of the carriers through the main grid lines 10 and the back electrode. At the same time, the main grid lines 10 contained in the light-receiving surface of the crystalline silicon cell 111 and the back electrode contained on the back surface are also convenient for connection with the crystalline silicon cell 111 of the same shape, thereby facilitating the acquisition of a crystalline silicon cell unit 11 with a parallelogram structure or a crystalline silicon cell unit 11 with a trapezoidal structure, and facilitating the acquisition of a photovoltaic module with a parallelogram structure.

[0040] It should be noted that the crystalline silicon cell 111 in the photovoltaic module provided in the present application can be obtained by cutting the crystalline silicon solar cell wafer mentioned later, or can be obtained from a crystalline silicon wafer with a triangular structure through a conventional crystalline silicon cell preparation process.

[0041] The above-mentioned technical solution disclosed in the present application sets the crystalline silicon cells in the photovoltaic module into a triangular structure, and connects the crystalline silicon cells in the triangular structure using the main grid lines and back electrodes located at the edge positions to obtain crystalline silicon cell units with a parallelogram structure or a trapezoidal structure, and splices the crystalline silicon cell units into a cell string with a parallelogram structure, and splices multiple cell strings into a parallelogram structure to avoid as much as possible the existence of blank areas in the photovoltaic module with a parallelogram structure, so that the photovoltaic module with a parallelogram structure can be better used in the BIPV photovoltaic curtain wall to increase the power generation of the BIPV photovoltaic curtain wall.

[0042] In a photovoltaic module provided by an embodiment of the present application, the fine grid lines 20 may include a plurality of first fine grid lines 201 parallel to one of the main grid lines 10 and a plurality of second fine grid lines 202 perpendicular to the first fine grid lines 201 .

[0043] In the photovoltaic module provided in the present application, the fine grid lines 20 included in the light-receiving surface of the crystalline silicon cell 111 may include multiple first fine grid lines 201 parallel to one of the main grid lines 10 included therein and multiple second fine grid lines 202 perpendicular to the first fine grid lines 201, so that even when a problem occurs with a certain fine grid line 20, the fine grid lines 20 intersecting with it can collect the carriers generated at that position, that is, the first fine grid lines 201 and the second fine grid lines 202 can play a better role in the carriers generated inside the crystalline silicon cell 111, so as to improve the reliability and performance of the power generation of the crystalline silicon cell 111.

[0044] In a photovoltaic module provided by an embodiment of the present application, the crystalline silicon cells 111 within a crystalline silicon cell unit 11 are connected in a shingled form.

[0045] In the photovoltaic module provided in the present application, the crystalline silicon cells 111 in the crystalline silicon cell unit 11 can be connected in a shingled form (i.e., a shingled cell string can be formed) to reduce the gap between two adjacent crystalline silicon cells 111, thereby increasing the effective light-receiving area of ​​the photovoltaic module.

[0046] In a photovoltaic module provided by an embodiment of the present application, the crystalline silicon cells 111 in the crystalline silicon cell unit 11 are connected to each other by conductive glue.

[0047] Two adjacent crystalline silicon cells 111 in the crystalline silicon cell unit 11 may be connected by conductive adhesive to achieve shingled connection between the crystalline silicon cells 111 , thereby improving the reliability of the connection between the crystalline silicon cells 111 .

[0048] In a photovoltaic module provided by an embodiment of the present application, the crystalline silicon cell 111 is a bifacial crystalline silicon cell capable of generating electricity on both the light-receiving side and the backlight side.

[0049] The crystalline silicon cell 111 in the photovoltaic module provided in the present application can specifically be a double-sided crystalline silicon cell that can generate electricity on both the light-receiving side and the backlight side, so as to increase the power generation of the photovoltaic module and the BIPV photovoltaic curtain wall.

[0050] In addition, the crystalline silicon cell 111 mentioned in this application may specifically be a polycrystalline silicon cell or a monocrystalline silicon cell, and may specifically be an N-type crystalline silicon cell or a P-type crystalline silicon cell. This application does not impose any limitation on the specific type of the crystalline silicon cell 111 .

[0051] In a photovoltaic module provided by an embodiment of the present application, the crystalline silicon cell 111 is an isosceles right triangle structure.

[0052] The crystalline silicon cell 111 provided in the present application may specifically be an isosceles right triangle structure, so as to facilitate the preparation and acquisition of the crystalline silicon cell 111 and facilitate splicing thereof to obtain a photovoltaic module with a parallelogram structure.

[0053] Among them, when the crystalline silicon cell 111 is obtained by cutting the crystalline silicon solar cell with a square structure mentioned later, setting the crystalline silicon cell 111 to an isosceles right triangle structure can fully utilize the area of ​​the crystalline silicon solar cell with a square structure, that is, it will not cause waste of the crystalline silicon solar cell.

[0054] The present application also provides a crystalline silicon solar cell. Figure 7 , which shows a schematic structural diagram of a crystalline silicon solar cell provided in an embodiment of the present application. The crystalline silicon solar cell is a rectangular structure, wherein:

[0055] The surface of the crystalline silicon solar cell may include a plurality of triangular regions 3 of the same shape. The triangular regions 3 are used to obtain the crystalline silicon cells 111 included in any of the above-mentioned photovoltaic modules by cutting along their edges.

[0056] The crystalline silicon solar cell provided in the embodiment of the present application can be specifically a rectangular structure, and its size can be specifically the same as the size of an existing conventional crystalline silicon cell. Among them, the surface of the crystalline silicon solar cell can include a plurality of triangular areas 3 of the same shape, the area and shape of these triangular areas 3 are the same, and each triangular area 3 can correspond to the crystalline silicon cell 111 in the photovoltaic module mentioned above, that is, each triangular area 3 includes a main grid line 10 and a fine grid line 20 located on the light-receiving surface and includes a back electrode located on the backlight surface. By cutting along the edge of the triangular area 3 using a process such as laser slicing, a plurality of crystalline silicon cells 111 contained in any of the above-mentioned photovoltaic modules can be obtained, so that the cut crystalline silicon cells 111 can be better used in the photovoltaic module with a parallelogram structure.

[0057] Compared with traditional cells, the crystalline silicon solar cell provided in this application is fully compatible with existing processes, and laser slicing does not cause waste of crystalline silicon solar cell cells, does not burden the manufacturing cost of photovoltaic modules, and can be fully implemented in existing processes.

[0058] An embodiment of the present application provides a crystalline silicon solar cell, which has a square structure.

[0059] The crystalline silicon solar cell included in the embodiment of the present application may specifically be a square structure to facilitate the preparation and acquisition of the crystalline silicon solar cell.

[0060] in, Figure 7The description is made by taking a crystalline silicon solar cell having a square structure and including 8 triangular areas 3 as an example, that is, a crystalline silicon solar cell having a square structure can be cut to obtain 8 crystalline silicon cells 111. Of course, a crystalline silicon solar cell having a square structure can also include 2 or 4 triangular areas 3. The present application does not impose any limitation on the number of triangular areas 3 contained in the crystalline silicon solar cell.

[0061] The present application also provides a crystalline silicon solar cell screen. Figure 8 , which shows a framework diagram of a crystalline silicon solar cell mesh provided in an embodiment of the present application. The crystalline silicon solar cell mesh is used to prepare any of the above-mentioned crystalline silicon solar cells. The crystalline silicon solar cell mesh may include multiple triangular mesh areas 4 of the same shape and used to prepare the crystalline silicon cells 111 included in any of the above-mentioned photovoltaic modules.

[0062] The crystalline silicon solar cell screen can be prepared on a silicon wafer by a screen printing process to obtain the above-mentioned crystalline silicon solar cell, wherein the crystalline silicon solar cell screen can include a plurality of triangular screen areas 4 of the same shape for preparing the above-mentioned crystalline silicon cell 111, the triangular screen area 4 corresponding to the triangular area 3 in the crystalline silicon solar cell, and each triangular screen area 4 can include a main grid line pattern corresponding to the main grid line 10 and used to prepare the main grid line 10 of the crystalline silicon cell 111, and a fine grid line pattern corresponding to the fine grid line 20 and used to prepare the fine grid line 20 of the crystalline silicon cell 111 (both the main grid line pattern and the fine grid line pattern are not shown in FIG. Figure 8 As shown in the figure), so as to prepare the above-mentioned crystalline silicon solar cell with the help of the crystalline silicon solar cell screen, and then to obtain the crystalline silicon cell 111.

[0063] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device comprising a series of elements are inherent to the elements. In the absence of further restrictions, the elements limited by the statement "comprise one..." do not exclude the presence of other identical elements in the process, method, article or device comprising the elements. In addition, the above-mentioned technical solutions provided in the embodiments of the present application are not described in detail in accordance with the corresponding technical solutions in the prior art to achieve the same principle, so as to avoid excessive elaboration.

[0064] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present application. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A photovoltaic module, characterized in that: Includes multiple battery strings, including: The plurality of battery strings form a parallelogram structure and each battery string has a parallelogram structure, which is used for splicing photovoltaic modules to facilitate application in BIPV photovoltaic curtain walls; Each of the battery strings includes a plurality of crystalline silicon battery units in a parallelogram structure or a trapezoidal structure, and the crystalline silicon battery unit is formed by connecting a preset number of crystalline silicon batteries; The crystalline silicon cell has a triangular structure, wherein the light-receiving surface of the crystalline silicon cell includes busbars located on three sides of the triangular structure and a plurality of fine grid lines intersecting the busbars; the backlight surface of the crystalline silicon cell includes back electrodes located on three sides of the triangular structure; the busbars included on the light-receiving surface of the crystalline silicon cell and the back electrode included on the backlight surface are convenient for connection with crystalline silicon cells of the same shape; The fine gate lines include a plurality of first fine gate lines parallel to one of the main gate lines and a plurality of second fine gate lines perpendicular to the first fine gate lines, so that even if a fine gate line has a problem, the fine gate lines intersecting with it can still collect carriers generated at that position; The crystalline silicon cell is obtained by cutting a crystalline silicon solar cell prepared from a crystalline silicon solar cell screen. The surface of the crystalline silicon solar cell includes multiple triangular areas of the same shape, and the triangular areas are used to obtain crystalline silicon cells by cutting along their edges.

2. The photovoltaic module according to claim 1, characterized in that The crystalline silicon cells in the crystalline silicon cell unit are connected in a shingled form.

3. The photovoltaic module according to claim 2, characterized in that The crystalline silicon cells in the crystalline silicon cell unit are connected to each other via conductive glue.

4. The photovoltaic module according to claim 1, characterized in that The crystalline silicon cell is a double-sided crystalline silicon cell capable of generating electricity on both the light-receiving side and the backlight side.

5. The photovoltaic module according to claim 1, characterized in that The crystalline silicon cell is an isosceles right triangle structure.

6. A crystalline silicon solar cell, characterized in that: The crystalline silicon solar cell has a rectangular structure, wherein: The surface of the crystalline silicon solar cell comprises a plurality of triangular regions of the same shape, and the triangular regions are used to obtain the crystalline silicon cells included in the photovoltaic module according to any one of claims 1 to 5 by cutting along their edges.

7. The crystalline silicon solar cell according to claim 6, characterized in that: The crystalline silicon solar cell has a square structure.

8. A crystalline silicon solar cell screen, characterized in that: The crystalline silicon solar cell mesh is used to prepare the crystalline silicon solar cell as claimed in claim 6 or 7, and the crystalline silicon solar cell mesh includes multiple triangular mesh areas of the same shape and is used to prepare the crystalline silicon cells included in the photovoltaic module as claimed in any one of claims 1 to 5.

Images