Multi-main-grid solar cell and photovoltaic module

Abstract

A solar cell piece body comprises a packaging frame body, a front panel is horizontally fixed to the upper side of the interior of the packaging frame body, a back panel is horizontally fixed to the lower side of the interior of the packaging frame body, and a photovoltaic cell piece is arranged at the position, between the front panel and the back panel, in the packaging frame body; a solar cell fine grid is arranged on the front face of the photovoltaic cell piece, a front face fixing film is arranged between the front face of the solar cell fine grid and the front face plate, and the front face of the photovoltaic cell piece is fixedly connected with the front face plate through the front face fixing film. The problems that the outer diameter of an existing main grid is large, a bonding pad and a welding point on the main grid can cause the shading phenomenon, the use amount of silver paste is increased, the shading phenomenon of the bonding pad and the welding point reduces the power generation efficiency of a solar cell panel, and the use amount of the silver paste is increased, so that the production cost of a solar cell is increased are solved.

Description

Technical Field

[0001] The invention relates to the technical field of solar cell sheets, and in particular to a multi-busbar solar cell and a photovoltaic module. Background Art

[0002] Solar cells convert sunlight energy directly into electrical energy without producing any pollutants, so solar cells are becoming more and more popular. Metallization is a key step in the production process of solar cells. It is to print electrode paste on the surface of solar cells and dry it to form metallized contact to conduct current. Solar cells include cells. The front of the cell is usually printed with multiple criss-crossing main grids and fine grids. The fine grids can collect the photocurrent converted by the cell. The photocurrent collected by the fine grids is collected on the main grid, and the main grid is then connected to the external solder ribbon component material through the pads on it. There are solder points or pads on the grid, but the pads or solder points on the grid generally occupy a large proportion of the space of the main grid. Therefore, if a main grid with solder points or pads is used, the main grid itself is relatively thick, then the pads and solder points on the main grid will cause shading and increase the cost of silver paste.

[0003] The existing announcement number is CN107170844A, and the name is a main grid-free solar cell, including a substrate with a front and a back side, a front electrode formed on the front side of the substrate, the front electrode is composed of a plurality of fine grids arranged on the front side of the substrate, and the solar cell also includes a plurality of columns of welding strips for collecting and transmitting the current collected by each fine grid, each column of welding strips is connected to the front side of the substrate through a column of welding points arranged on the front side of the substrate, and each fine grid is in contact with at least one column of welding strips to be conductive, the main grid on the traditional front electrode is completely removed, and a plurality of columns of welding points are designed, so that after the welding strips are welded at the component end, a grid-distributed main grid-free front electrode can be formed, which can effectively optimize the current transmission path, increase the effective conduction of current, and avoid the influence of broken grids on current collection.

[0004] However, the above-mentioned main grids are all provided with welding points or welding pads, but the welding pads or welding points on the group grid generally occupy a large proportion of the space of the main grid. Therefore, if a main grid with welding points or welding pads is used, the outer diameter of the main grid itself is large, then the welding pads and welding points on the main grid will cause shading and increase the amount of silver paste used. The shading phenomenon of the welding pads and welding points reduces the power generation efficiency of the solar cell panel, and the increase in the amount of silver paste used increases the production cost of the solar cell. Summary of the invention

[0005] The object of the present invention is to provide a multi-busbar solar cell and a photovoltaic module, aiming to improve the above-mentioned problems.

[0006] The present invention is achieved in that:

[0007] A multi-main-grid solar cell, wherein the solar cell body comprises a packaging frame, a front panel is horizontally fixed to the upper inner side of the packaging frame, and a back panel is horizontally fixed to the lower inner side of the packaging frame, a photovoltaic cell is arranged inside the packaging frame between the front panel and the back panel, a solar cell fine grid is arranged on the front side of the photovoltaic cell, and a front fixing film is arranged between the front side of the solar cell fine grid and the front panel, the front side of the photovoltaic cell is fixedly connected to the front panel via the front fixing film, a back fixing film is arranged between the back side of the solar cell fine grid and the back panel, and the back side of the solar cell fine grid is fixedly connected to the back panel via the back fixing film.

[0008] Furthermore, a busbar is fixed on the inner wall of the packaging frame, and the busbar is electrically connected to the fine grid of the solar cell.

[0009] Furthermore, the solar cell fine grid and the photovoltaic cell sheet are provided with a light-curing adhesive layer, and the solar cell fine grid and the photovoltaic cell sheet are fixedly connected through the light-curing adhesive layer.

[0010] Furthermore, the fine grids of the solar cell include fine grids and interconnecting parts. A plurality of fine grids are printed at intervals on the photovoltaic cell sheet, and interconnecting parts are arranged between the plurality of fine grids on the photovoltaic cell sheet. The plurality of fine grids on the photovoltaic cell sheet are electrically connected through the interconnecting parts, and the fine grids at both ends of the photovoltaic cell sheet are electrically connected to the busbar through the interconnecting parts.

[0011] Furthermore, the interconnection member includes a first interconnection member, the first interconnection member includes a first connection portion, the first connection portion is a spindle cone, and both ends of the first connection portion are respectively connected to adjacent fine grid ends, and both ends of the first connection portion are respectively welded to adjacent fine grid ends to form a first welding point.

[0012] Furthermore, the upper and lower end surfaces of the first connecting portion are vertically electrically connected with first connecting copper wires, and the other end of the first connecting copper wire on the first connecting portion is electrically connected to an adjacent fine grid or busbar, and a narrowing portion is provided in the middle of the first connecting copper wire.

[0013] Furthermore, the interconnection member includes a second interconnection member, the second interconnection member includes a second connecting portion, two second connecting portions are provided, and a second connecting copper wire is vertically electrically connected between the two second connecting portions, and both ends of the two second connecting portions are respectively electrically connected to adjacent fine grid ends or bus strips.

[0014] Furthermore, two ends of the second connection portion are respectively welded to adjacent fine grid ends or busbars to form second welding points.

[0015] Furthermore, the fine grid includes a central portion and side ends, and the outer diameter of the central portion is greater than the outer diameter of the side ends.

[0016] A photovoltaic assembly comprises at least a plurality of multi-main-grid solar cells. The photovoltaic assembly comprises a mounting frame, a plurality of solar cell bodies are mounted inside the mounting frame, and the plurality of solar cell bodies in the mounting frame are connected in series to form a battery pack.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The outer end faces of the front panel and the back panel are fixedly connected to the inner wall of the packaging frame, and the front panel and the back panel are both made of transparent resin plates, and the photovoltaic cells are heterojunction cells, and the thin grids of the solar cells are spaced thin silver grid lines printed by screen printing according to the circuit drawings, and the thin grids of the solar cells arranged at intervals are adhered to form a whole through the front fixing film combined with the light-curing adhesive, so that the solar cell body is made of thin silver grid lines. Since the solar cell body does not have a thick main grid line, the outer diameter of the thin silver grid line is small, and the silver paste used in production is small, which reduces the production cost of the solar cell body. At the same time, since the outer diameter of the thin silver grid line is small, the area blocked by light is small, thereby ensuring the power generation efficiency of the solar cell body;

[0019] 2. During use, the first connection part of the first interconnection member is made of fine grid wires. The spindle cone structure used in the first interconnection member facilitates the electrical welding of the fine grids. At the same time, the two ends of the first connection copper wire are electrically connected to adjacent fine grids or busbars, respectively, ensuring the electrical connection of the fine grids and the first interconnection member, ensuring the collection of the conduction current to the busbar, and the fine grids connected together are all made of fine silver grid wires, which ensures the transmission of current while reducing the shading area of ​​the grid wires, reducing the material cost, and ensuring the power generation efficiency of the solar cell panel body;

[0020] During use, the second connecting portion of the second interconnecting member is made of fine grid wires. The second connecting portion of the second interconnecting member is provided with two respectively used for connecting and assembling fine grids, so as to facilitate electrical welding of the fine grids, adjacent fine grid ends or bus strips. At the same time, the two ends of the second connecting copper wire are respectively electrically connected to the adjacent second connecting portions, thereby ensuring electrical connection between the fine grid and the second interconnecting member, and ensuring collection and conduction current to the bus strip. The fine grids connected together are all made of fine silver grid wires, thereby ensuring current transmission while reducing the shading area of ​​the grid wires, reducing material costs, and ensuring the power generation efficiency of the solar cell panel body. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 is a front view of a photovoltaic module in an embodiment of the present invention;

[0023] Figure 2 is a schematic diagram of the overall exploded structure of a solar cell in an embodiment of the present invention;

[0024] Figure 3 is a front view of a solar cell fine grid in the first embodiment of the present invention;

[0025] Figure 4 is a front view of a first interconnection member in a first embodiment of the present invention;

[0026] Figure 5 is a front view of a solar cell fine grid according to a second embodiment of the present invention;

[0027] Figure 6 is a front view of a second interconnection member in a second embodiment of the present invention;

[0028] Figure 7 is a front view of a fine grid in an embodiment of the present invention;

[0029] Figure 8 is a cross-sectional schematic diagram of a thin grid of a solar cell in an embodiment of the present invention;

[0030] In the figure: 1. mounting frame; 2. solar cell body; 21. packaging frame; 22. front panel; 23. front fixing film; 24. solar cell fine grid; 25. photovoltaic cell; 26. busbar; 27. back fixing film; 28. back panel; 29. ​​photocuring adhesive layer; 3. fine grid; 31. center portion; 32. side end portion; 4. first interconnecting member; 41. first connecting portion; 42. first welding point; 43. first connecting copper wire; 44. narrowing portion; 5. second interconnecting member; 51. second connecting portion; 52. second connecting copper wire; 53. second welding point. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the invention claimed for protection, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0032] Embodiment 1:

[0033] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, a multi-main-grid solar cell includes a solar cell body 2, and the solar cell body 2 includes a packaging frame 21. A front panel 22 is horizontally fixed to the upper side of the interior of the packaging frame 21, and a back panel 28 is horizontally fixed to the lower side of the interior of the packaging frame 21. A photovoltaic cell 25 is arranged inside the packaging frame 21 between the front panel 22 and the back panel 28. A solar cell fine grid 24 is arranged on the front side of the photovoltaic cell 25, and a front fixing film 23 is arranged between the front side of the solar cell fine grid 24 and the front panel 22. The front side of the photovoltaic cell 25 is fixedly connected to the front panel 22 through the front fixing film 23. A back fixing film 27 is arranged between the back side of the solar cell fine grid 24 and the back panel 28, and the back side of the solar cell fine grid 24 is fixed to the back panel 28 through the back fixing film 27. The front panel 22 and the back panel 28 are connected, and the outer end faces of the front panel 22 and the back panel 28 are fixedly connected to the inner wall of the packaging frame 21, and the front panel 22 and the back panel 28 are both made of transparent resin plates, and the photovoltaic cell 25 is a heterojunction cell, and the solar cell fine grid 24 is a spaced fine silver grid line that is screen-printed according to the circuit drawing, and the spaced solar cell fine grid 24 is formed into a whole by the front fixing film 23 combined with the light-curing adhesive, so that the solar cell body 2 is made of fine silver grid lines. Since the solar cell body 2 does not have a thicker main grid line, the outer diameter of the fine silver grid line is small, and the silver paste used in production is small, which reduces the production cost of the solar cell body 2. At the same time, due to the small outer diameter of the fine silver grid line, the area blocked by light is small, thereby ensuring the power generation efficiency of the solar cell panel body 2.

[0034] See also Figure 2 , Figure 3 and Figure 7 A busbar 26 is fixed on the inner wall of the packaging frame 21, and the busbar 26 is electrically connected to the solar cell fine grid 24. The solar cell fine grid 24 and the photovoltaic cell 25 are provided with a photocurable adhesive layer 29, and the solar cell fine grid 24 and the photovoltaic cell 25 are fixedly connected through the photocurable adhesive layer 29. During use, the solar cell fine grid 24 is electrically connected to the busbar 26, which is convenient for collecting the current generated by multiple solar cell body 2, and the solar cell fine grid 24 and the photovoltaic cell 25 are fixedly connected through the photocurable adhesive layer 29, which conveniently ensures the stability of the fixed connection between the solar cell fine grid 24 and the photovoltaic cell 25. At the same time, the transmittance of the photocurable adhesive layer used is greater than or equal to 85%, and the refractive index of the photocurable adhesive layer is greater than or equal to 1.5. Preferably, the transmittance of the photocurable adhesive layer is greater than or equal to 90%, and the refractive index of the photocurable adhesive layer is greater than or equal to 1.6. The transmittance and refractive index of the photocurable adhesive layer are high, which can effectively improve the power of the component.

[0035] See also Figure 3 and Figure 4 The solar cell fine grid 24 includes a fine grid 3 and an interconnection member. A plurality of fine grids 3 are printed at intervals on the photovoltaic cell 25, and an interconnection member is provided between the plurality of fine grids 3 on the photovoltaic cell 25. The plurality of fine grids 3 on the photovoltaic cell 25 are electrically connected through the interconnection member, and the fine grids 3 at both ends of the photovoltaic cell 25 are electrically connected to the busbar 26 through the interconnection member. The interconnection member includes a first interconnection member 4, and the first interconnection member 4 includes a first connecting portion 41. The first connecting portion 41 is a spindle cone, and the two ends of the first connecting portion 41 are respectively connected to the ends of the adjacent fine grids 3. The two ends of the first connecting portion 41 are respectively welded to the ends of the adjacent fine grids 3 to form a first welding point 42. The first connecting portion 41 is The upper and lower end surfaces are both vertically electrically connected with a first connecting copper wire 43, and the other end of the first connecting copper wire 43 on the first connecting portion 41 is electrically connected to an adjacent fine grid 3 or a busbar 26. A narrowing portion 44 is provided in the middle of the first connecting copper wire 43 to reduce the shading area of ​​the first connecting copper wire 43 and ensure the power generation efficiency of the photovoltaic panel. During use, the first connecting portion 41 in the first interconnecting member 4 is made of a fine grid wire, and the spindle cone structure adopted in the first interconnecting member 4 is convenient for electrically welding the fine grid 3. At the same time, the two ends of the first connecting copper wire 43 are electrically connected to the adjacent fine grid 3 or the busbar 26 respectively, ensuring the electrical connection between the fine grid 3 and the first interconnecting member 4, and ensuring the collection of the conduction current to the busbar 26.

[0036] See also Figure 7 The fine grid 3 includes a central portion 31 and side ends 32, and the outer diameter of the central portion 31 is larger than the outer diameter of the side ends 32. The outer diameter of the central portion 31 of the fine grid 3 is larger than the outer diameter of the side ends 32, which is convenient for reducing manufacturing materials and shading area, reducing costs and increasing power generation efficiency.

[0037] Working principle: the front panel 22, the front fixing panel 23, the conductive module 24, the photovoltaic cell 25, the bus bar 26, the back fixing film 27 and the back panel 28 are sequentially arranged from top to bottom in the packaging frame 21 and laminated to form a whole. At the same time, a plurality of spaced fine grids 3 on the conductive module 24 are welded through the end of the first connecting portion 41 on the first interconnecting member 4 to form a first welding point 42, and the upper and lower ends of the first connecting portion 41 are electrically connected to adjacent fine grids 3 or bus bar 26, respectively, so as to ensure that the adjacent fine grids 3 electrically conduct electricity, and the first connecting copper wires 43 on the first connecting portions 41 at both ends of the plurality of fine grids 3 are connected to the bus bar 26 to form a conductive whole.

[0038] Embodiment 2:

[0039] The implementation principle and technical effects of the device provided in the embodiment of the present invention are the same as those of Example 1. For the sake of brief description, for matters not mentioned in this embodiment, reference may be made to the corresponding contents in Example 1.

[0040] See also Figure 5 and Figure 6 The interconnection member includes a second interconnection member 5, and the second interconnection member 5 includes a second connection part 51. Two second connection parts 51 are provided, and a second connection copper wire 52 is vertically electrically connected between the two second connection parts 51. The two ends of the two second connection parts 51 are respectively electrically connected to the adjacent ends of the fine grid 3 or the busbar 26. The two ends of the second connection part 51 are respectively welded to the adjacent ends of the fine grid 3 or the busbar 26 to form a second welding point 53. During use, the second connection part 51 in the second interconnection member 5 is made of fine grid wire. Two second connection parts 51 in the second interconnection member 5 are provided, which are respectively used to connect and assemble the fine grid 3, so as to facilitate electrical welding of the fine grid 3, the adjacent ends of the fine grid 3 or the busbar 26. At the same time, the two ends of the second connection copper wire 52 are respectively electrically connected to the adjacent second connection parts 51, so as to ensure the electrical connection between the fine grid 3 and the second interconnection member 5, and to ensure the collection of the conduction current to the busbar 26.

[0041] Working principle: the front panel 22, the front fixing panel 23, the conductive module 24, the photovoltaic cell 25, the busbar 26, the back fixing film 27 and the back panel 28 are sequentially arranged from top to bottom in the packaging frame 21 and laminated to form a whole. At the same time, a plurality of spaced fine grids 3 on the conductive module 24 are welded through the end of the second connecting portion 51 on the second interconnecting member 5 to form a first welding point 53, and the upper and lower ends of the second connecting portion 51 are electrically connected to adjacent fine grids 3 or busbars 26, respectively, so as to ensure that the adjacent fine grids 3 electrically conduct electricity, and the second connecting copper wires 52 on the second connecting portions 51 at both ends of the plurality of fine grids 3 are connected to the busbar 26 to form a conductive whole.

[0042] See also Figure 1A photovoltaic module, the photovoltaic module comprises at least one of a plurality of multi-main-grid solar cells as claimed in any one of claims 1 to 9, the photovoltaic module comprises a mounting frame 1, a plurality of solar cell bodies 2 are mounted inside the mounting frame 1, and the plurality of solar cell bodies 2 of the mounting frame 1 are connected in series to form a battery pack.

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A multi-busbar solar cell, comprising a solar cell body (2), characterized in that: The solar cell body (2) comprises a packaging frame (21), a front panel (22) is horizontally fixed on the upper side of the interior of the packaging frame (21), and a back panel (28) is horizontally fixed on the lower side of the interior of the packaging frame (21), a photovoltaic cell (25) is arranged inside the packaging frame (21) between the front panel (22) and the back panel (28), a solar cell grid (24) is arranged on the front side of the photovoltaic cell (25), and a front fixing film (23) is arranged between the front side of the solar cell grid (24) and the front panel (22), the front side of the photovoltaic cell (25) is fixedly connected to the front panel (22) via the front fixing film (23), a back fixing film (27) is arranged between the back side of the solar cell grid (24) and the back panel (28), and the back side of the solar cell grid (24) is fixedly connected to the back panel (28) via the back fixing film (27).

2. A multi-busbar solar cell according to claim 1, characterized in that: A busbar (26) is fixed on the inner wall of the packaging frame (21), and the busbar (26) is electrically connected to the solar cell fine grid (24).

3. A multi-busbar solar cell according to claim 2, characterized in that: The solar cell fine grid (24) and the photovoltaic cell sheet (25) are provided with a light-curing adhesive layer (29), and the solar cell fine grid (24) and the photovoltaic cell sheet (25) are fixedly connected via the light-curing adhesive layer (29).

4. A multi-busbar solar cell according to claim 3, characterized in that: The solar cell fine grid (24) comprises a fine grid (3) and an interconnection member, wherein a plurality of the fine grids (3) are printed at intervals on the photovoltaic cell sheet (25), and the interconnection member is provided between the plurality of the fine grids (3) on the photovoltaic cell sheet (25), the plurality of the fine grids (3) on the photovoltaic cell sheet (25) are electrically connected via the interconnection member, and the fine grids (3) at both ends of the photovoltaic cell sheet (25) are electrically connected to a busbar (26) via the interconnection member.

5. A multi-busbar solar cell according to claim 4, characterized in that: The interconnection member comprises a first interconnection member (4), the first interconnection member (4) comprises a first connection portion (41), the first connection portion (41) is a spindle cone, and the two ends of the first connection portion (41) are respectively connected to the adjacent ends of the fine grid (3), and the two ends of the first connection portion (41) are respectively welded to the adjacent ends of the fine grid (3) to form a first welding point (42).

6. A multi-busbar solar cell according to claim 5, characterized in that: The upper and lower end surfaces of the first connecting portion (41) are both vertically electrically connected to a first connecting copper wire (43), and the other end of the first connecting copper wire (43) on the first connecting portion (41) is electrically connected to an adjacent fine grid (3) or a busbar (26), and a narrowing portion (44) is provided in the middle of the first connecting copper wire (43).

7. A multi-busbar solar cell according to claim 6, characterized in that: The interconnection member comprises a second interconnection member (5), the second interconnection member (5) comprises a second connection portion (51), two second connection portions (51) are provided, and a second connection copper wire (52) is vertically electrically connected between the two second connection portions (51), and the two ends of the two second connection portions (51) are respectively electrically connected to the ends of the adjacent fine grids (3) or the busbars (26).

8. A multi-busbar solar cell according to claim 7, characterized in that: Two ends of the second connection portion (51) are respectively welded to adjacent ends of the fine grid (3) or the busbar (26) to form second welding points (53).

9. The multi-busbar solar cell according to claim 6, characterized in that: The fine grid (3) comprises a central portion (31) and a side end portion (32), and the outer diameter of the central portion (31) is greater than the outer diameter of the side end portion (32).

10. A photovoltaic module, characterized in that: The photovoltaic component comprises at least one multi-busbar solar cell according to any one of claims 1 to 9, and the photovoltaic component comprises a mounting frame (1), wherein a plurality of solar cell bodies (2) are mounted inside the mounting frame (1), and the plurality of solar cell bodies (2) in the mounting frame (1) are connected in series to form a battery pack.

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