Solar cell and photovoltaic module

Abstract

The utility model discloses a solar cell and a photovoltaic assembly, which are applied to the field of photovoltaic technology. A cutting surface is formed on at least one side surface of the battery piece; passivation layers are arranged on the edge area, close to the cutting surface, of the surface of the battery piece and the cutting surface; a welding spot is arranged in a region, which is close to the edge of the passivation layer and is not covered by the passivation layer, of the battery piece; a plurality of welding spots are arranged on at least one side surface of the battery piece; the welding spots are sequentially arranged in the direction perpendicular to the cutting face. In the direction perpendicular to the cutting face, the distance H1 between every two adjacent welding spots close to one side of the cutting face is smaller than the distance H2 between every two adjacent welding spots at least partially deviating from one side of the cutting face. The distance between the adjacent welding spots close to one side of the cutting surface is smaller than the distance between the adjacent welding spots away from one side of the cutting surface, so that the distance between the welding spots close to one side of the cutting surface and the edge of the cutting surface is increased, and the welding spots are arranged in an area which is close to the edge of the passivation layer and is not covered by the passivation layer; and the problem of pseudo soldering of the assembly caused by winding plating of the passivation layer is effectively reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to photovoltaic technology field especially relates to a solar cell and photovoltaic module. BACKGROUND

[0002] The ASP technology (Advanced Surface Passivation Technology) first adopts laser to slice the whole cell piece, thereby forming a cutting surface on the side surface of the cell piece, and then adopts a passivation film to passivate the cutting surface. Since it has a good effect on repairing micro-damage and can reduce passivation loss, the conversion efficiency of the cell and the module is improved, and the power of the TOPCon (Tunnel Oxide Passivating Contact) 72 double-glass module can be increased by 4W+. However, in the process of passivating the cutting surface, the passivation layer is easy to be plated around the surface of the cell piece and cover the solder joints on the edge of the surface of the cell piece, thereby causing the problem of false soldering of the module, and further reducing the yield of the module and increasing the rework rate. SUMMARY

[0003] Therefore, the utility model aims at providing a solar cell and photovoltaic module for improving the problem of false soldering of the module caused by side passivation.

[0004] To solve the above technical problems, the utility model provides a solar cell, which comprises: a cell piece; a cutting surface is formed on at least one side surface of the cell piece; a passivation layer is arranged on the edge region of the surface of the cell piece close to the cutting surface and the cutting surface.

[0005] An area of the cell piece close to the edge of the passivation layer and not covered by the passivation layer is provided with a solder joint;

[0006] At least one surface of the cell piece is provided with a plurality of solder joints; the solder joints are arranged in sequence in a direction perpendicular to the cutting surface; in the direction perpendicular to the cutting surface, the interval H1 of adjacent solder joints on the side close to the cutting surface is smaller than the interval H2 of adjacent solder joints on the side away from the cutting surface.

[0007] Optionally, the interval H1 of adjacent solder joints on the side close to the cutting surface is smaller than or equal to 1 / 3 of the interval H2 of adjacent solder joints on the side away from the cutting surface.

[0008] Optionally, the front surface and the back surface of the cell piece are both provided with a plurality of solder joints;

[0009] On the front surface of the cell piece, the distance between the first solder joint on the side close to the cutting surface and the edge of the cutting surface is 8.7mm-10.7mm, and the values at both ends are included.

[0010] And / or, the distance from the first welding point near the cutting surface side to the edge of the cutting surface is 9.6mm-11.6mm, and the value including both ends.

[0011] Optionally, the interval between the first welding point and the second welding point near the cutting surface side in the direction perpendicular to the cutting surface is less than the interval of the remaining adjacent welding points.

[0012] Optionally, the surface of the battery piece is provided with a plurality of main grids and a plurality of fine grids; the extension direction of each main grid is perpendicular to the cutting surface, and the main grids are arranged in sequence in the direction parallel to the cutting surface; the extension direction of each fine grid is parallel to the cutting surface, and the fine grids are arranged in sequence in the direction perpendicular to the cutting surface; the welding point is arranged on the surface at the connection position of the fine grid and the main grid.

[0013] Optionally, the first welding point near the cutting surface side is arranged on the surface at the connection position of the seventh to eleventh fine grid and the main grid.

[0014] Optionally, both ends of the main grid are provided with a fishing rod structure; the first welding point near the cutting surface side is arranged on the surface at the connection position of the fishing rod structure and the main grid.

[0015] Optionally, in the direction perpendicular to the cutting surface, the interval H3 of the adjacent welding points near the side opposite to the cutting surface is less than the interval H2 of the adjacent welding points away from the cutting surface side.

[0016] Optionally, the interval H3 of the adjacent welding points near the side opposite to the cutting surface is equal to the interval H1 of the adjacent welding points near the cutting surface side.

[0017] To solve the above technical problems, the utility model also provides a photovoltaic module, which comprises the solar cell.

[0018] The utility model provides a solar cell, include: cell piece, the cutting surface is formed to at least one side surface of cell piece, the edge region of cell piece surface close to cutting surface and cutting surface are provided with passivation layer, the edge of cell piece close to passivation layer and the region not being covered by passivation layer are provided with solder joint, at least one side surface of cell piece is provided with a plurality of solder joint, the solder joint is sequentially arranged along the direction perpendicular to cutting surface, along the direction perpendicular to cutting surface, the interval H1 of adjacent solder joint on the side close to cutting surface is less than the interval H2 of adjacent solder joint on the side at least partially away from cutting surface, the utility model discloses through make the interval of adjacent solder joint on the side close to cutting surface less than the interval of adjacent solder joint on the side away from cutting surface, increase the distance of solder joint on the side close to cutting surface to cutting surface edge, guarantee the region on the edge close to passivation layer and not being covered by passivation layer to be provided with solder joint, effectively reduce the assembly false soldering problem due to passivation layer plating, thereby increase assembly yield, reduce rework rate, the utility model discloses still provide a photovoltaic module, has above-mentioned beneficial effect. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or prior art, below will to the drawing needed to use in the embodiment or prior art description simple introduction, obviously, the drawing in the following description only is the embodiment of the utility model, for the ordinary skilled person in the art comes, under the premise of not paying the creative labor, can also obtain other drawings according to the provided drawing.

[0020] Figure 1 It is the first kind of solder joint arrangement schematic diagram provided for the embodiment of the utility model;

[0021] Figure 2 It is the second kind of solder joint arrangement schematic diagram provided for the embodiment of the utility model.

[0022] The following is the explanation of the reference signs:

[0023] 1-cell piece;2-solder joint;21-first solder joint;22-second solder joint;23-third solder joint;3-main grid;4-fine grid;5-fish fork structure. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantage of the embodiment of the utility model more clear, below will combine the drawing in the embodiment of the utility model, the technical scheme in the embodiment of the utility model is clearly, completely described, obviously, the described embodiment only is the part embodiment of the utility model, not all the embodiment. Based on the embodiment in the utility model, all other embodiments obtained by the ordinary skilled person in the art without doing the creative labor premise, all belong to the scope of the utility model protection.

[0025] Referring to Figure 1 and Figure 2 , Figure 1 The first kind of arrangement of welding points provided by the embodiment of the utility model; Figure 2 The second kind of arrangement of welding points provided by the embodiment of the utility model. The solar cell provided by the embodiment of the utility model can comprise: a cell piece 1; a cutting surface is formed on at least one side surface of the cell piece 1; a passivation layer is arranged on the edge region of the surface of the cell piece 1 close to the cutting surface and the cutting surface;

[0026] The region of the cell piece 1 close to the edge of the passivation layer and not covered by the passivation layer is provided with a welding point 2;

[0027] The cell piece 1 is provided with a plurality of welding points 2 on at least one side surface; the welding points 2 are arranged in sequence along the direction perpendicular to the cutting surface; along the direction perpendicular to the cutting surface, the interval H1 of the adjacent welding points 2 on the side close to the cutting surface is less than the interval H2 of the adjacent welding points 2 on the side at least partially away from the cutting surface.

[0028] It should be noted that the direction perpendicular to the cutting surface in the embodiment is the Y direction, and the direction parallel to the cutting surface is the X direction.

[0029] It should be noted that the cell piece in the embodiment is a split cell piece, which is formed by cutting a whole cell piece. The embodiment does not limit the specific number of cutting surfaces, and the specific number of cutting surfaces can be determined according to the actual cutting mode, for example, when the cell piece 1 is obtained by one cutting, the cutting surface can be formed on one side surface of the cell piece 1; when the cell piece 1 is obtained by twice cutting, the cutting surfaces can be respectively formed on the opposite two side surfaces of the cell piece 1.

[0030] The embodiment does not limit the specific interval of the adjacent welding points 2 on the side close to the opposite side of the cutting surface, for example, along the direction perpendicular to the cutting surface, the interval H3 of the adjacent welding points 2 on the side close to the opposite side of the cutting surface can be less than the interval H2 of the adjacent welding points 2 on the side at least partially away from the cutting surface. Preferably, in the embodiment, the interval H3 of the adjacent welding points 2 on the side close to the opposite side of the cutting surface is equal to the interval H1 of the adjacent welding points 2 on the side close to the cutting surface.

[0031] It should be noted that the passivation layer arranged on the edge region of the surface of the cell piece 1 close to the cutting surface in the embodiment is the passivation layer plated on the surface of the cell piece 1 in the process of forming the passivation layer on the cutting surface. The passivation layer can also be arranged on the other side surface of the cell piece 1 except the cutting surface and the region close to the edge of the surface.

[0032] The embodiment is not limited to the specific type of the passivation layer, as long as the passivation effect can be ensured. For example, the passivation layer can include an aluminum oxide layer. The thickness of the aluminum oxide layer can be 30-100 nm, including the values at both ends. Further, the surface of the aluminum oxide layer away from the cutting surface can also be superimposed with a silicon nitride layer, and / or a silicon oxynitride layer, and / or a silicon oxide layer. It should be noted that the aluminum oxide layer, the silicon nitride layer, the silicon oxynitride layer, and the silicon oxide layer are all common materials in the prior art. The embodiment is not limited to the internal components of the passivation layer, but directly uses a single-layer film layer or a superimposed multi-layer film layer made of existing materials as the passivation layer.

[0033] The embodiment is not limited to the specific width of the passivation layer provided on the surface of the battery piece (i.e., the width of the passivation layer around the plating). For example, the width of the passivation layer provided on the surface of the battery piece can be less than 10 mm. Typically, the distance around the plating of the passivation layer provided on the front surface of the battery piece is about 7.7 mm, and the distance around the plating of the passivation layer provided on the back surface of the battery piece is about 8.6 mm.

[0034] The embodiment is not limited to the specific type of the battery piece 1. For example, the battery piece 1 can be a TOPCon battery piece. The embodiment is not limited to the specific structure of the TOPCon battery piece, and the specific structure can refer to the existing TOPCon battery piece, which will not be described here.

[0035] The embodiment is not limited to the specific surface on which the solder joint 2 is provided. The specific surface on which the solder joint 2 is provided can be determined according to the specific type of the battery piece 1. For example, when the battery piece 1 is a TOPCon battery piece, the front surface and the back surface of the battery piece 1 can each be provided with a plurality of solder joints 2. In addition, the battery piece 1 in the embodiment can also have a plurality of solder joints 2 provided on one side surface.

[0036] The embodiment does not limit the specific distance of the first welding point 21 to the edge of the cutting surface, for example, on the front surface of the battery sheet 1, the distance of the first welding point 21 near the cutting surface side to the edge of the cutting surface can be 8.7mm-10.7mm, and the values at both ends are included; in order to better improve the virtual welding, the preferred distance of the first welding point 21 near the cutting surface side to the edge of the cutting surface in the embodiment can be 8.7mm, 8.8mm, 8.9mm, 9mm, 9.1mm…10.5mm, 10.6mm or 10.7mm; and / or, on the back surface of the battery sheet 1, the distance of the first welding point 21 near the cutting surface side to the edge of the cutting surface can be 9.6mm-11.6mm, and the values at both ends are included; in order to better improve the virtual welding, the preferred distance of the first welding point 21 near the cutting surface side to the edge of the cutting surface in the embodiment can be 9.6mm, 9.7mm, 9.8mm, 9.9mm, 10mm…11.4mm, 11.5mm or 11.6mm. The edge of the cutting surface in the embodiment represents the connection position of the cutting surface and the surface of the battery sheet 1. It should be noted that, in the case of constant width of the passivation layer, the position of the first welding point 21 in the embodiment is moved 2.5mm-4.5mm away from the cutting surface compared with the position of the first welding point of the traditional solar cell, and the values at both ends are included.

[0037] In order to better improve the virtual welding, the preferred distance of the first welding point 21 near the cutting surface side to the edge of the cutting surface in the embodiment can be 8.7mm, 8.8mm, 8.9mm, 9mm, 9.1mm…10.5mm, 10.6mm or 10.7mm.

[0038] The embodiment does not limit the specific arrangement of the welding points 2, for example, as shown in FIG. 1, along the direction perpendicular to the cutting surface, the distance between the first welding point 21 and the second welding point 22 near the cutting surface side is less than the distance between the remaining adjacent welding points 2. Figure 1

[0039] It should be noted that in the traditional solar cell, a plurality of welding points are arranged on the surface of the battery sheet, and the welding points are arranged in sequence along the direction perpendicular to the cutting surface, and the distance between the adjacent welding points is the same. Among them, the first welding point near the cutting surface side is closer to the edge of the cutting surface (the first welding point on the front surface of the battery sheet is about 7.7mm away from the edge of the cutting surface, and the first welding point on the back surface of the battery sheet is about 8.6mm away from the edge of the cutting surface), which is easily covered by the passivation layer, and although the second welding point near the cutting surface side is not easily covered by the passivation layer, the distance between the second welding point and the edge of the passivation layer is too far, which ultimately leads to the virtual welding problem of the assembly.

[0040] ​Traditional solar cells often experience cold solder joints because the first solder joint near the cut surface is located on the passivation layer. This embodiment essentially addresses this by inwardly contracting the first solder joint 21 near the cut surface. This increases the distance from the first solder joint 21 to the edge of the cut surface while ensuring that this distance is less than the distance from the second solder joint 22 in traditional solar cells. In other words, it ensures that the solder joint 21, which is not covered by the passivation layer, is as close to the edge of the passivation layer as possible, thus improving the cold solder joint problem caused by side passivation.

[0041] This embodiment does not limit the specific structure of the battery cell 1. It may, but is not limited to, having multiple main grids 2 and multiple fine grids 4 on the surface of the battery cell 1. The extension direction of each main grid 2 is perpendicular to the cutting surface, and they are arranged sequentially along a direction parallel to the cutting surface. The extension direction of each fine grid 4 is parallel to the cutting surface, and they are arranged sequentially along a direction perpendicular to the cutting surface. Solder joints 2 are located on the surface where the fine grids 4 and the main grids 2 are connected. Furthermore, in this embodiment, solder joints 2 may also be located on the surface of the main grid 2, between adjacent fine grids 4, i.e., on the surface where the fine grids 4 and the main grids 2 are not connected.

[0042] This embodiment does not limit the specific location of the first solder joint 21 in the fine grid 4. For example, the first solder joint 21 near the cut surface can be located on the surface where any one of the 7th to 11th fine grids 4 connects to the main grid 2. It should be noted that in conventional solar cells, the first solder joint 21 is usually located at the position corresponding to the 6th fine grid 4. In this embodiment, the position of the first solder joint 21 is moved away from the cut surface by 1 to 5 fine grids 4 compared to the position of the first solder joint in conventional solar cells, including the values ​​at both ends.

[0043] Furthermore, in this embodiment, both ends of the main grid 2 can be provided with harpoon structures 5; the first solder point 21 near the cut surface is provided on the surface where the harpoon structure 5 and the main grid 2 are connected. It should be noted that the function of the harpoon structure 5 is to collect current. Compared with traditional solar cells, this embodiment shrinks the harpoon structure inward, which improves the current path.

[0044] Furthermore, in order to improve the problem of cold solder joints, such as Figure 2 As shown, in this embodiment, along the direction perpendicular to the cutting surface, the spacing between adjacent solder points 2 from the first solder point 21 to the third solder point 23 on the side closest to the cutting surface can be smaller than the spacing between the remaining adjacent solder points 2. It should be noted that this embodiment is essentially... Figure 1On the basis of the structure shown, a new soldering point 2 is added between the first soldering point and the second soldering point on the side close to the cutting surface, while the distance from the first soldering point 21 to the edge of the cutting surface is greater than the distance from the first soldering point to the edge of the cutting surface in the traditional solar cell, and the second soldering point 22 is added, and the distance from the second soldering point 22 to the edge of the cutting surface is less than the distance from the second soldering point to the edge of the cutting surface in the traditional solar cell, that is, the soldering point 2 not covered by the passivation layer is ensured to be as close as possible to the edge of the passivation layer, thereby further improving the false welding problem of the assembly caused by side passivation.

[0045] The embodiment does not limit the specific distance of the second soldering point 22 to the edge of the cutting surface, for example, the distance of the second soldering point 22 on the side close to the cutting surface to the edge of the cutting surface can be 8mm-11mm, and the values at both ends are included. It should be noted that the greater the distance of the second soldering point 22 to the edge of the cutting surface, the longer the path required for the current collected at the edge to be discharged, which will cause loss; the smaller the distance of the second soldering point 22 to the edge of the cutting surface, the more likely the false welding problem. Preferably, the distance of the second soldering point 22 on the side close to the cutting surface to the edge of the cutting surface in the embodiment can be 8mm, 9mm, 10mm or 11mm.

[0046] Based on the above embodiment, the utility model discloses by making the interval of the adjacent soldering point on the side close to the cutting surface less than the interval of the adjacent soldering point on the side away from the cutting surface, increase the distance of the soldering point on the side close to the cutting surface to the edge of the cutting surface, guarantee the area close to the edge of the passivation layer and not covered by the passivation layer is provided with the soldering point, effectively reduce the false welding problem of the assembly caused by the passivation layer around the plating, thereby increase the assembly yield, reduce the rework rate.

[0047] The photovoltaic module provided by the embodiment of the utility model can include the solar cell as described above.

[0048] The embodiment does not limit the specific type of solar cell used, and specific reference can be made to the above-mentioned embodiments of the solar cell, which will not be repeated here.

[0049] The photovoltaic module in the embodiment can include other structures in addition to the solar cell, and specific reference can be made to the existing photovoltaic module, which will not be repeated here.

[0050] Based on the above embodiment, the utility model adopts the above-mentioned solar cell, by making the interval of the adjacent soldering point on the side close to the cutting surface less than the interval of the adjacent soldering point on the side away from the cutting surface, increase the distance of the soldering point on the side close to the cutting surface to the edge of the cutting surface, guarantee the area close to the edge of the passivation layer and not covered by the passivation layer is provided with the soldering point, effectively reduce the false welding problem of the assembly caused by the passivation layer around the plating, thereby increase the assembly yield, reduce the rework rate.

[0051] The solar cell and the photovoltaic module are described in detail above, and for the general technical personnel in the field, the specific implementation and application range will be changed according to the idea of the embodiment of the utility model, and the above, the content of the specification should not be understood as the limitation of the utility model.

Claims

1. A solar cell, characterized by, Comprising: a battery piece; a cutting surface is formed on at least one side surface of the battery piece; a passivation layer is arranged on the edge region of the battery piece surface close to the cutting surface and the cutting surface; a welding spot is arranged on the region of the battery piece close to the edge of the passivation layer and not covered by the passivation layer; a plurality of welding spots are arranged on at least one surface of the battery piece; the welding spots are arranged in sequence along the direction perpendicular to the cutting surface; along the direction perpendicular to the cutting surface, the interval H1 of the adjacent welding spots close to the cutting surface side is smaller than the interval H2 of the adjacent welding spots away from the cutting surface side.

2. The solar cell according to claim 1, characterized in that, The interval H1 of the adjacent welding spots close to the cutting surface side is smaller than or equal to 1 / 3 of the interval H2 of the adjacent welding spots away from the cutting surface side.

3. The solar cell according to claim 1, characterized in that, A plurality of welding spots are arranged on both the front surface and the back surface of the battery piece; On the front surface of the battery piece, the distance from the first welding spot close to the cutting surface side to the edge of the cutting surface is 8.7mm-10.7mm, and the values at both ends are included; And / or, on the back surface of the battery piece, the distance from the first welding spot close to the cutting surface side to the edge of the cutting surface is 9.6mm-11.6mm, and the values at both ends are included.

4. The solar cell of claim 1, wherein Along the direction perpendicular to the cutting surface, the interval between the first welding spot and the second welding spot close to the cutting surface side is smaller than the interval of the remaining adjacent welding spots.

5. The solar cell according to any one of claims 1 to 4, wherein A plurality of main grids and a plurality of fine grids are arranged on the surface of the battery piece; the extension direction of each main grid is perpendicular to the cutting surface, and the main grids are arranged in sequence along the direction parallel to the cutting surface; the extension direction of each fine grid is parallel to the cutting surface, and the fine grids are arranged in sequence along the direction perpendicular to the cutting surface; the welding spots are arranged on the surface at the connection position of the fine grid and the main grid.

6. The solar cell according to claim 5, characterized in that, The first welding spot close to the cutting surface side is arranged on the surface at the connection position of any one of the seventh to eleventh fine grids and the main grid.

7. The solar cell of claim 5, wherein, Both ends of the main grid are provided with a fishing rod structure; the first welding spot close to the cutting surface side is arranged on the surface at the connection position of the fishing rod structure and the main grid.

8. The solar cell of claim 1, wherein, Along the direction perpendicular to the cutting surface, the interval H3 of the adjacent welding spots close to the side opposite to the cutting surface is smaller than the interval H2 of the adjacent welding spots away from the cutting surface side.

9. The solar cell of claim 8, wherein, The interval H3 of the adjacent welding spots close to the side opposite to the cutting surface is equal to the interval H1 of the adjacent welding spots close to the cutting surface side.

10. A photovoltaic module, characterized by Comprising: The solar cell of any one of claims 1 to 9.

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