Solar cell, photovoltaic module and photovoltaic system
By setting an isolation section on the solar cell busbar with a width greater than that of the solder strip, the problem of microcracks caused by contact between the solder strip and the cell was solved, thus improving the production yield of photovoltaic modules.
Patent Information
- Application Number
- CN202423319591.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2026-01-30
- Estimated Expiration
- 2034-12-31
AI Technical Summary
In existing technologies, the welding of the edge main grid of solar cells to the solder strip can easily cause microcracks in the cells, resulting in low yield in photovoltaic module production.
An isolation section connected to the solder joint is set on the main grid of the solar cell. The isolation section is used to isolate the solder strip from the surface of the cell, preventing the burrs on the edge of the solder strip from contacting the cell. By setting an isolation section on the main grid that is wider than the solder strip, the solder strip is prevented from contacting the four corners of the cell.
This effectively avoids microcracks caused by contact between the solder ribbon and the surface of the solar cell, thus improving the production yield of photovoltaic modules.
Smart Images
Figure CN223859567U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to solar cell technical field, concretely relates to a solar cell, photovoltaic module and photovoltaic system. BACKGROUND
[0002] The back contact (Interdigitated back contact, IBC) solar cell, namely the interdigital back contact battery, the positive / negative electrode grid line is designed on the back of the battery, so that the front surface avoids the shielding of the metal grid line completely, and the optical loss caused by the shielding of the electrode grid line is eliminated, and the electrode grid line can be designed wider than the existing one, so that the series resistance loss is reduced, thereby the conversion efficiency of the battery is greatly improved. In addition, due to the design that the electrode grid line is not on the front surface of the battery, the product appearance is more beautiful, and is suitable for various application scenarios.
[0003] In the related art, when a solar cell is welded into a photovoltaic module by using a welding strip, burrs may exist at the edge of the welding strip after cutting. When the welding strip is arranged on the cell sheet, the burrs at the edge of the welding strip are easy to contact the cell sheet. In particular, when the welding points on the edge main grid of the solar cell are welded with the welding strip, the welding strip is easy to contact the four corner positions of the solar cell, causing the cell sheet to crack, thereby causing the problem of low production yield of the photovoltaic module. UTILITY MODEL CONTENTS
[0004] The utility model provides a solar cell, aims at solving the problem that the welding points of the edge main grid of the prior art solar cell are welded with the welding strip, which is easy to cause the cell sheet to crack, thereby causing the problem of low production yield.
[0005] The utility model provides a solar cell, which comprises:
[0006] A silicon wafer, the silicon wafer comprising a first edge and a second edge arranged opposite along a first direction, and a third edge and a fourth edge arranged opposite along a second direction;
[0007] A first main grid arranged on the first surface of the silicon wafer and close to the first edge, the first main grid being provided with a first welding point close to the third edge, a first isolation part connected with the first welding point and extending towards the third edge along the second direction, a second welding point close to the fourth edge, and a second isolation part connected with the second welding point and extending towards the fourth edge along the second direction, the width of the first isolation part and the second isolation part being greater than the width of the first main grid; and
[0008] A second main grid is arranged on the first surface of the silicon wafer and close to the second edge, the second main grid is provided with a third soldering point close to the third edge, a third isolation part connected with the third soldering point and extending to the third edge along the second direction, a fourth soldering point close to the fourth edge, and a fourth isolation part connected with the fourth soldering point and extending to the fourth edge along the second direction, the width of the third and fourth isolation parts is greater than the width of the second main grid.
[0009] Preferably, the width of the first and second isolation parts is uniformly arranged, and the width of the third and fourth isolation parts is uniformly arranged.
[0010] Preferably, the width of the first and second isolation parts is non-uniformly arranged, and the minimum width of the first and second isolation parts is greater than the width of the first main grid.
[0011] Preferably, the width of the third and fourth isolation parts is non-uniformly arranged, and the minimum width of the third and fourth isolation parts is greater than the width of the second main grid.
[0012] Preferably, the first, second, third and fourth isolation parts each include an end close to the edge position of the silicon wafer and a starting end close to the middle position of the silicon wafer, and the width of the end is greater than the width of the starting end.
[0013] Preferably, the width of the first, second, third and fourth isolation parts gradually increases from the starting end to the end.
[0014] Preferably, the distance from the first isolation part to the third edge is 2-15 mm, and the distance from the second isolation part to the fourth edge is 2-15 mm.
[0015] Preferably, the distance from the third isolation part to the third edge is 2-15 mm, and the distance from the fourth isolation part to the fourth edge is 2-15 mm.
[0016] The utility model also provides a photovoltaic module, including first solder strip, second solder strip and above-mentioned solar cell;
[0017] The first solder strip extends along the second direction, the first solder strip is connected with the first soldering point and the second soldering point, and the width of the first isolation part and the second isolation part is greater than the width of the first solder strip; the second solder strip extends along the second direction, the second solder strip is connected with the third soldering point and the fourth soldering point, and the width of the third isolation part and the fourth isolation part is greater than the width of the second solder strip.
[0018] The utility model also provides a photovoltaic system, including above-mentioned photovoltaic module.
[0019] The solar cell provided by the utility model is provided with a first isolation part connected with the first welding spot and a second isolation part connected with the second welding spot on the first main grid, and a third isolation part connected with the third welding spot and a fourth isolation part connected with the fourth welding spot on the second main grid, so that the first isolation part and the second isolation part are used to isolate the welding belt from the surface of the cell sheet when the welding belt is welded with the first welding spot and the second welding spot, and the third isolation part and the fourth isolation part are used to isolate the welding belt from the surface of the cell sheet when the welding belt is welded with the third welding spot and the fourth welding spot, so that the burrs on the edge of the welding belt are prevented from contacting the surface of the cell sheet and causing the edge of the cell sheet to crack, the first isolation part, the second isolation part, the third isolation part and the fourth isolation part are used to isolate the welding belt from the surface of the cell sheet, the welding belt is prevented from contacting the four corner positions of the cell sheet when the welding belt is welded with the solar cell, the cell sheet breakage rate is reduced, and the production yield of the photovoltaic module is improved. BRIEF DESCRIPTION OF DRAWINGS
[0020] Figure 1 A structure schematic diagram of a solar cell provided by the utility model embodiment is shown in the figure;
[0021] Figure 2 A partial structure schematic diagram of a solar cell provided by the utility model embodiment is shown in the figure;
[0022] Figure 3 A second partial structure schematic diagram of a solar cell provided by the utility model embodiment is shown in the figure;
[0023] Figure 4 A third partial structure schematic diagram of a solar cell provided by the utility model embodiment is shown in the figure;
[0024] Figure 5 A local schematic diagram of a solar cell connected with a first welding belt provided by the utility model embodiment is shown in the figure;
[0025] Figure 6 A local schematic diagram of a solar cell connected with a second welding belt provided by the utility model embodiment is shown in the figure. DETAILED DESCRIPTION
[0026] In order to make the purpose, technical scheme and advantages of the utility model more clearly, the utility model is further described in detail below by combining with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model, and are not used to limit the utility model.
[0027] The utility model discloses an embodiment of a solar cell is through being provided with the first isolation part of connecting with the first welding spot and the second isolation part of connecting with the second welding spot at the first main grid, and is provided with the third isolation part of connecting with the third welding spot and the fourth isolation part of connecting with the fourth welding spot at the second main grid, and when the welding band is welded with the first welding spot and the second welding spot, the first isolation part and the second isolation part are used to isolate the welding band and the surface of cell piece, avoid the burr of welding band edge and the surface contact of cell piece to cause the edge of cell piece to crack, and when the welding band is welded with the third welding spot and the fourth welding spot, the third isolation part and the fourth isolation part are used to isolate the welding band and the surface of cell piece, avoid the burr of welding band edge and the surface contact of cell piece to cause the edge of cell piece to crack, so the first isolation part, the second isolation part, the third isolation part and the fourth isolation part are used to isolate the welding band and the surface of cell piece, avoid the welding band and the four corner positions of cell piece contact when the welding band is welded with solar cell, thereby reduce the cell piece crack rate, thereby improve the production yield of photovoltaic module.
[0028] Please refer to Figures 1-2 The utility model discloses an embodiment of a solar cell 100, comprising:
[0029] The silicon wafer 1 includes the first edge 11 and the second edge 12 oppositely arranged along the first direction X, and the third edge 13 and the fourth edge 14 oppositely arranged along the second direction Y.
[0030] The first main grid 2 is arranged on the first surface of the silicon wafer 1 and close to the first edge 11, and the first main grid 2 is provided with the first welding spot 31 close to the third edge 13, the first isolation part 32 connected with the first welding spot 31 and extending to the third edge 13 along the second direction Y, the second welding spot 33 close to the fourth edge 14, the second isolation part 34 connected with the second welding spot 33 and extending to the fourth edge 14 along the second direction Y, and the width of the first isolation part 32 and the second isolation part 34 is greater than the width of the first main grid 2.
[0031] The second main grid 4 is arranged on the first surface of the silicon wafer 1 and close to the second edge 12, and the second main grid 4 is provided with the third welding spot 51 close to the third edge 13, the third isolation part 52 connected with the third welding spot 51 and extending to the third edge 13 along the second direction Y, the fourth welding spot 53 close to the fourth edge 14, the fourth isolation part 54 connected with the fourth welding spot 53 and extending to the fourth edge 14 along the second direction Y, and the width of the third isolation part 52 and the fourth isolation part 54 is greater than the width of the second main grid 4.
[0032] In the embodiment of the utility model, the first direction X and the second direction Y are perpendicular to each other. The solar cell can be a back contact solar cell or a double-sided contact solar cell. The first surface of the silicon wafer 1 can be the front surface or the back surface of the solar cell. For example, when the silicon wafer 1 is a back contact cell, the first surface is the back surface of the solar cell. The first main grid 2 and the second main grid 4 are edge main grids of the solar cell, the first soldering point 31 and the first isolation part 32 are of an integrated structure, the second soldering point 33 and the second isolation part 34 are of an integrated structure, and the first soldering point 31 and the first isolation part 32 can be printed at one time by using a printing process or can be printed in steps. The second soldering point 33 and the second isolation part 34 can be printed at one time by using a printing process or can be printed in steps. The third soldering point 51 and the third isolation part 52 are of an integrated structure, the fourth soldering point 53 and the fourth isolation part 54 are of an integrated structure, and they can be printed at one time by using a printing process or can be printed in steps.
[0033] The first isolation part 32, the second isolation part 34, the third isolation part 52, and the fourth isolation part 54 are respectively arranged at the four corner positions of the solar cell 100. The first isolation part 32, the second isolation part 34, the third isolation part 52, and the fourth isolation part 54 can print metal paste on the corresponding main grid by means of silk screen printing, and the metal paste can be silver paste, aluminum paste, or the like. In this regard, the specific material of the metal paste is not limited, and in actual use, a technician can select a suitable material according to requirements.
[0034] In the embodiment of the utility model, when the solder strip is welded with the first soldering point 31 and the second soldering point 33 on the first main grid 2, the first isolation part 32 and the second isolation part 34 isolate the solder strip from the first surface of the cell wafer, so that the burrs at the edge of the solder strip can be prevented from contacting the first surface of the cell wafer, and the solder strip can be prevented from contacting the edge of the cell wafer and causing hidden cracks. Similarly, when the solder strip is welded with the third soldering point 51 and the fourth soldering point 53 on the second main grid 4, the third isolation part 52 and the fourth isolation part 54 isolate the solder strip from the first surface of the cell wafer, so that the burrs at the edge of the solder strip can be prevented from contacting the surface of the cell wafer and causing hidden cracks at the edge of the cell wafer. Therefore, the first isolation part 32, the second isolation part 34, the third isolation part 52, and the fourth isolation part 54 isolate the solder strip from the surface of the cell wafer, so that the problem of hidden cracks at the four corner positions of the cell wafer caused by the welding of the solder strip with the soldering points on the edge main grid can be avoided, and the production yield of the photovoltaic module can be improved.
[0035] In the embodiment of the utility model, the width of the first isolation part 32 and the second isolation part 34 is greater than the width of the first main grid 2, and the specific width of the first isolation part 32 and the second isolation part 34 and the width of the first main grid 2 can be flexibly set according to the actual situation. Similarly, the width of the third isolation part 52 and the fourth isolation part 54 is greater than the width of the second main grid 4, and the width of the third isolation part 52 and the fourth isolation part 54 and the width of the second main grid 4 can be flexibly set according to the actual situation. For example, the width of the first isolation part 32 and the second isolation part 34 is 1.1-1.2 times the width of the first main grid 2, and the width of the third isolation part 52 and the fourth isolation part 54 is 1.1-1.2 times the width of the second main grid 4, so that the first isolation part 32, the second isolation part 34, the third isolation part 52 and the fourth isolation part 54 can achieve the effect of good isolation between the solder strip and the surface of the battery piece.
[0036] Preferably, the width of the first isolation part 32, the second isolation part 34, the third isolation part 52 and the fourth isolation part 54 is the same, and the width of the first main grid 2 and the width of the second main grid 4 are the same, which is convenient for printing.
[0037] As an embodiment of the utility model, the first main grid 2 is further provided with a fifth welding point 35 located between the first welding point 31 and the second welding point 33, and the specific number of the fifth welding point is not limited. It can be one, two or more. The second main grid 4 is further provided with a sixth welding point 55 located between the third welding point 51 and the fourth welding point 53, and the specific number of the sixth welding point is not limited. It can be one, two or more.
[0038] As an embodiment of the utility model, the solar cell further comprises a plurality of intermediate main grids 6 located between the first main grid 2 and the second main grid 4, and each intermediate main grid 6 is provided with a plurality of seventh welding points 61. The specific number of the intermediate main grid 6 is not limited, which can be one, two or more. When the solar cell is a back contact cell, each main grid is arranged on the back surface of the silicon wafer 1, and the polarity of the adjacent two main grids is opposite. When the solar cell is a double-sided contact cell, each main grid is arranged on the front surface or the back surface of the silicon wafer 1, and the polarity of the adjacent two main grids is the same.
[0039] As an embodiment of the utility model, the width of the first isolation part 32 and the second isolation part 34 is uniformly set, and the width of the third isolation part 52 and the fourth isolation part 54 is uniformly set. Among them, the width direction of the first isolation part 32, the second isolation part 34, the third isolation part 52 and the fourth isolation part 54 is the first direction X, and the length direction of the first isolation part 32, the second isolation part 34, the third isolation part 52 and the fourth isolation part 54 is the second direction Y.
[0040] As Figure 2As shown, in the embodiment, the widths of the first isolation part 32 and the second isolation part 34 are uniformly set, and the widths of the third isolation part 52 and the fourth isolation part 54 are uniformly set, facilitating the width design and printing preparation of the first isolation part 32, the second isolation part 34, the third isolation part 52 and the fourth isolation part 54. For example, the widths of the first isolation part 32 and the second isolation part 34 are uniformly set, and the third isolation part 52 and the fourth isolation part 54 can be long strip-shaped.
[0041] Please refer to Figure 3 As another embodiment of the utility model, the widths of the first isolation part 32 and the second isolation part 34 are unevenly set, and the minimum widths of the first isolation part 32 and the second isolation part 34 are greater than the width of the first main grid 2, which can locally reduce the widths of the first isolation part 32 and the second isolation part 34 and reduce the printing paste of the first isolation part 32 and the second isolation part 34.
[0042] As an embodiment of the utility model, the widths of the third isolation part 52 and the fourth isolation part 54 are unevenly set, and the minimum widths of the third isolation part 52 and the fourth isolation part 54 are greater than the width of the second main grid 4, which can locally reduce the widths of the third isolation part 52 and the fourth isolation part 54 and reduce the printing paste of the third isolation part 52 and the fourth isolation part 54.
[0043] Please refer to Figure 3 As an embodiment of the utility model, the first isolation part 32, the second isolation part 34, the third isolation part 52 and the fourth isolation part 54 each include an end 321 close to the edge position of the silicon wafer 1 and a starting end 322 close to the middle position of the silicon wafer 1, and the width of the end 321 is greater than the width of the starting end 322.
[0044] Specifically, the first isolation part 32, the second isolation part 34, the third isolation part 52 and the fourth isolation part 54 have the same structure. The width of one end of the first isolation part 32 close to the third edge 13 is greater than the width of one end of the first isolation part 32 close to the first solder joint 31, the width of the second isolation part 34 close to the fourth edge 14 is greater than the width of the second isolation part 34 close to the second solder joint 33, the width of the third isolation part 52 close to the third edge 13 is greater than the width of the third isolation part 52 close to the third solder joint 51, and the width of the fourth isolation part 54 close to the fourth edge 14 is greater than the width of the fourth isolation part 54 close to the fourth solder joint 53.
[0045] In the embodiment, since the end 321 of the first isolation part 32, the second isolation part 34, the third isolation part 52 and the fourth isolation part 54 is closer to the edge of the silicon wafer 1, by widening the width of the end 321 of the first isolation part 32, the second isolation part 34, the third isolation part 52 and the fourth isolation part 54, the isolation effect on the solder strip can be further improved, the contact between the solder strip and the edge of the silicon wafer 1 is further prevented, and the risk of hidden cracking of the silicon wafer 1 is further reduced.
[0046] Please refer to Figure 4 As another embodiment of the present application, the width of the first isolation portion 32, the second isolation portion 34, the third isolation portion 52 and the fourth isolation portion 54 gradually increases from the starting end 322 to the end 321.
[0047] In this embodiment, the width of the first isolation portion 32, the second isolation portion 34, the third isolation portion 52 and the fourth isolation portion 54 gradually increases from the starting end 322 to the end 321, so that the width of the first isolation portion 32, the second isolation portion 34, the third isolation portion 52 and the fourth isolation portion 54 gradually increases from the starting end 322 to the end 321. Since the risk of hidden crack of the silicon wafer 1 gradually increases from the middle to the edge of the silicon wafer 1, the width of the first isolation portion 32, the second isolation portion 34, the third isolation portion 52 and the fourth isolation portion 54 gradually increases from the starting end 322 to the end 321, which can improve the isolation effect of the solder strip, further reduce the risk of hidden crack of the silicon wafer 1, and ensure that the first isolation portion 32, the second isolation portion 34, the third isolation portion 52 and the fourth isolation portion 54 have less printing paste, thereby reducing the production cost and achieving the balance between the low cost of printing paste and the low hidden crack rate of the silicon wafer 1. For example, the cross section of the first isolation portion 32, the second isolation portion 34, the third isolation portion 52 and the fourth isolation portion 54 is trapezoidal.
[0048] As an embodiment of the present application, the distance from the first isolation portion 32 to the third edge 13 is 2mm-15mm, and the distance from the second isolation portion 34 to the fourth edge 14 is 2mm-15mm.
[0049] As an embodiment of the present application, the distance from the third isolation portion 52 to the third edge 13 is 2mm-15mm, and the distance from the fourth isolation portion 54 to the fourth edge 14 is 2mm-15mm.
[0050] In this embodiment, the distance from the first isolation portion 32 to the third edge 13 is 2mm-15mm, and the distance from the second isolation portion 34 to the fourth edge 14 is 2mm-15mm; the distance from the third isolation portion 52 to the third edge 13 is 2mm-15mm, and the distance from the fourth isolation portion 54 to the fourth edge 14 is 2mm-15mm. In such an embodiment, the distance from the first isolation portion 32 to the third edge 13 can be any value in 2mm, 3mm, 5mm, 8mm, 10mm and 15mm, which is not limited specifically herein; similarly, the distance from the second isolation portion 34 to the fourth edge 14 can be any value in 2mm-15mm, the distance from the third isolation portion 52 to the third edge 13 can be any value in 2mm-15mm, and the distance from the fourth isolation portion 54 to the fourth edge 14 can be any value in 2mm-15mm.
[0051] In the embodiment, the distance between the first isolation part 32, the second isolation part 34, the third isolation part 52 and the fourth isolation part 54 and the corresponding edge is controlled to be 2mm-15mm, which is convenient for printing and can better isolate the solder strip from the surface of the battery piece.
[0052] Please refer to Figure 5 and Figure 6 The utility model also provides a photovoltaic module, include: first solder strip 200, second solder strip 300 and solar cell 100 as above-mentioned embodiment, first solder strip 200 extends along second direction Y, first solder strip 200 is connected with first solder joint 31 and second solder joint 33, and the width of first isolation part 32 and second isolation part 34 is greater than the width of first solder strip 200, second solder strip 300 extends along second direction Y, second solder strip 300 is connected with third solder joint 51 and fourth solder joint 53, and the width of third isolation part 52 and fourth isolation part 54 is greater than the width of second solder strip 300.
[0053] When the first solder strip 200 is welded with the first solder joint 31 and the second solder joint 33 on the first main grid 2 of the solar cell 100, since the first isolation part 32 and the second isolation part 34 isolate the first solder strip 200 from the first surface of the solar cell 100, the burr at the edge of the first solder strip 200 can be avoided from contacting the first surface of the battery piece, and the first solder strip 200 can be prevented from contacting the battery piece to cause hidden cracks. Similarly, when the second solder strip 300 is welded with the third solder joint 51 and the fourth solder joint 53 on the second main grid 4, the third isolation part 52 and the fourth isolation part 54 isolate the second solder strip 300 from the first surface of the battery piece, and the burr at the edge of the second solder strip 300 can be avoided from contacting the surface of the battery piece to cause hidden cracks of the battery piece, thereby improving the production yield of the photovoltaic module.
[0054] In the embodiment, the plurality of solar cells in the photovoltaic module are connected together by the solder strip to form a cell string, so that the series connection of the current is realized. It can be understood that in such an embodiment, the photovoltaic module can also include a metal frame, a back plate, photovoltaic glass and a glue film. The glue film can be filled between the front and back surfaces of the solar cell and the photovoltaic glass, adjacent battery pieces and the like, and as a filler, it can be a transparent glue with good light transmission performance and aging resistance, for example, the glue film can use EVA glue film or POE glue film, which can be selected according to actual conditions, and is not limited here.
[0055] The photovoltaic glass can be covered on the adhesive film on the front side of the solar cell, the photovoltaic glass can be super white glass, which has high light transmittance, high transparency, and has superior physical, mechanical and optical properties, for example, the light transmittance of the super white glass can reach more than 92%, which can protect the solar cell without affecting the efficiency of the solar cell as much as possible. At the same time, the adhesive film can bond the photovoltaic glass and the solar cell together, and the presence of the adhesive film can seal and insulate the solar cell and prevent water and moisture.
[0056] The back plate can be attached to the adhesive film on the back side of the solar cell, the back plate can protect and support the solar cell, has reliable insulation, water resistance and aging resistance, the back plate can have multiple choices, usually can be tempered glass, organic glass, aluminum alloy TPT composite adhesive film and the like, which can be set according to the specific circumstances, which is not limited here. The whole composed of the back plate, the solar cell, the adhesive film and the photovoltaic glass can be arranged on the metal frame, the metal frame as the main external support structure of the whole solar photovoltaic module, and can stably support and install the solar photovoltaic module, for example, the solar photovoltaic module can be installed at the position required to be installed through the metal frame.
[0057] The utility model embodiment further provides a photovoltaic system, the photovoltaic system includes the photovoltaic module of above -mentioned embodiment. It needs to be explained that, the photovoltaic system has same or similar beneficial effect with above-mentioned solar cell, and the related place between both can be mutually referred to, in order to avoid repetition, here will not be repeated.
[0058] In the embodiment, the photovoltaic system can be applied in a photovoltaic power station, such as a ground power station, a roof power station, a water surface power station, etc., and can also be applied in a device or apparatus that generates electricity using solar energy, such as a user solar power source, a solar street lamp, a solar car, a solar building, etc. Of course, it can be understood that the application scenarios of the photovoltaic system are not limited to this, that is, the photovoltaic system can be applied in all fields that need to generate electricity using solar energy. Taking a photovoltaic power generation system network as an example, the photovoltaic system can include a photovoltaic array, a combiner box and an inverter, the photovoltaic array can be an array combination of a plurality of solar photovoltaic modules, for example, a plurality of solar photovoltaic modules can form a plurality of photovoltaic arrays, the photovoltaic arrays are connected to the combiner box, the combiner box can combine the currents generated by the photovoltaic arrays, the combined currents flow through the inverter to convert into alternating current required by a power grid, and then the alternating current is connected to the power grid to realize solar power supply.
[0059] The above is only a preferred embodiment of the utility model, and is not used to limit the utility model, and any modification, equivalent replacement and improvement within the spirit and principle of the utility model should be included in the protection scope of the utility model.
Claims
1. A solar cell, characterized by, The solar cell comprises: a silicon wafer, the silicon wafer comprising a first edge and a second edge oppositely arranged along a first direction, and a third edge and a fourth edge oppositely arranged along a second direction; a first main grid arranged on a first surface of the silicon wafer and close to the first edge, the first main grid comprising a first soldering point close to the third edge, a first isolation portion connected to the first soldering point and extending along the second direction towards the third edge, a second soldering point close to the fourth edge, a second isolation portion connected to the second soldering point and extending along the second direction towards the fourth edge, the first isolation portion and the second isolation portion having a width greater than a width of the first main grid; and a second main grid arranged on the first surface of the silicon wafer and close to the second edge, the second main grid comprising a third soldering point close to the third edge, a third isolation portion connected to the third soldering point and extending along the second direction towards the third edge, a fourth soldering point close to the fourth edge, a fourth isolation portion connected to the fourth soldering point and extending along the second direction towards the fourth edge, the third isolation portion and the fourth isolation portion having a width greater than a width of the second main grid. The width of the first isolation portion and the second isolation portion is uniform, and the width of the third isolation portion and the fourth isolation portion is uniform.
2. The solar cell according to claim 1, characterized in that, The width of the first isolation portion and the second isolation portion is non-uniform, and a minimum width of the first isolation portion and the second isolation portion is greater than the width of the first main grid.
3. The solar cell according to claim 1, characterized in that, The width of the third isolation portion and the fourth isolation portion is non-uniform, and a minimum width of the third isolation portion and the fourth isolation portion is greater than the width of the second main grid.
4. The solar cell of claim 1, wherein The first isolation portion, the second isolation portion, the third isolation portion and the fourth isolation portion each comprise an end close to a position of an edge of the silicon wafer and a start close to a position of a middle of the silicon wafer, and the width of the end is greater than the width of the start.
5. The solar cell of claim 1, wherein The width of the first isolation portion, the second isolation portion, the third isolation portion and the fourth isolation portion gradually increases from the start to the end.
6. The solar cell according to claim 5, characterized in that, The distance from the first isolation portion to the third edge is 2mm-15mm, and the distance from the second isolation portion to the fourth edge is 2mm-15mm.
7. The solar cell of claim 1, wherein The distance from the third isolation portion to the third edge is 2mm-15mm, and the distance from the fourth isolation portion to the fourth edge is 2mm-15mm.
8. The solar cell of claim 1, wherein, A first soldering strip, a second soldering strip, and a solar cell as claimed in any one of claims 1-8; 9. A photovoltaic module, characterized by The first soldering strip extends along the second direction, the first soldering strip is connected to the first soldering point and the second soldering point, and the width of the first isolation portion and the second isolation portion is greater than the width of the first soldering strip. The second soldering strip extends along the second direction, the second soldering strip is connected to the third soldering point and the fourth soldering point, and the width of the third isolation portion and the fourth isolation portion is greater than the width of the second soldering strip. The photovoltaic module as claimed in claim 9 is included.
10. A photovoltaic system characterized by,