Solar cell

Abstract

The utility model discloses a solar cell sheet, at least one surface of the cell sheet is provided with a grid line pattern, and the grid line pattern comprises a plurality of main grid lines which extend along a first direction and are arranged at intervals in a second direction vertical to the first direction; the auxiliary grid lines extend in the second direction perpendicular to the first direction and are arranged in the first direction at intervals, and the auxiliary grid lines intersect with the main grid lines; the plurality of bonding pads are arranged at intervals along the main grid lines; the auxiliary grid antennas are arranged at the joints of the main grid lines and the auxiliary grid lines and extend along the auxiliary grid lines on the two sides of the main grid lines, the auxiliary grid antennas comprise first parts which are connected with the main grid lines and are equal in width, and the distance between the far ends of the first parts on the two sides of the main grid lines is 0.8 + / -0.05 mm. According to the utility model, the equal-width first parts of the auxiliary grid antennas are set to be reasonable in length, so that the error-tolerant rate of the alignment deviation of the welding strip can be improved, and the proportion of grid breakage and pseudo soldering of the battery piece in industrial production can be reduced.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic cell technology, specifically to a solar cell. Background Technology

[0002] Among clean and renewable energy sources, solar energy is one of the most important. As the most important equipment in the utilization of solar energy, solar panels require strict quality control of their various components in order to improve the utilization rate of solar energy and extend the service life of solar panels.

[0003] Ideally, when connecting solar cells in series with solder ribbons, the ribbons should be perfectly aligned with the main grid lines. However, in actual production, misalignment is inevitable. When the solder ribbons overlap the fine grids on both sides of the main grid, the fine grids are very thin, which can easily lead to problems such as broken grids and poor soldering. Utility Model Content

[0004] To address at least one technical problem in the prior art, this utility model provides a solar cell.

[0005] To achieve the aforementioned utility model objective, the present utility model adopts the following technical solution: a solar cell, wherein at least one side of the solar cell has a grid pattern, the grid pattern comprising:

[0006] Multiple main grid lines extend along a first direction and are spaced apart in a second direction perpendicular to the first direction;

[0007] Multiple sub-gate lines extend along a second direction perpendicular to the first direction and are spaced apart in the first direction, and the sub-gate lines intersect the main gate lines;

[0008] Multiple pads are spaced apart along the main gate line;

[0009] Multiple sub-gate antennas are disposed at the junction of the main gate line and the sub-gate line, and extend along the sub-gate line on both sides of the main gate line. Each sub-gate antenna includes a first portion of equal width connected to the main gate line, and the distance between the distal ends of the first portion on both sides of the main gate line is 0.8±0.05mm.

[0010] Another technical solution adopted by this utility model is: a solar cell, wherein at least one side of the solar cell has a grid pattern, the grid pattern including:

[0011] Multiple main grid lines extend along a first direction and are spaced apart in a second direction perpendicular to the first direction;

[0012] Multiple sub-gate lines extend along a second direction perpendicular to the first direction and are spaced apart in the first direction, and the sub-gate lines intersect the main gate lines;

[0013] Multiple pads are spaced apart along the main gate line;

[0014] The secondary gate antenna is disposed at the junction of the main gate line and the secondary gate line, and extends along the secondary gate line on both sides of the main gate line. The secondary gate antenna includes a first part of equal width connected to the main gate line. The extension length of the first part is greater than or equal to (0.8-d) / 2, where d is the width of the main gate line in millimeters.

[0015] In some embodiments, the width d of the main grid line is 0.01-0.03 mm.

[0016] In some embodiments, one end of the first portion contacts the main grid line, and the other end has a second portion, the width of which gradually decreases in a direction away from the first portion along the second direction.

[0017] In some embodiments, the distance between the distal ends of the sub-grid antennas on both sides of the main grid line is 1.12 ± 0.05 mm.

[0018] In some embodiments, the sub-gate contact is located at the intersection of the main gate line and the sub-gate line where no pads are provided.

[0019] In some embodiments, the width of the first portion is 40±4μm.

[0020] Compared to existing technologies, the advantages of this invention include: the first portion of the equal-width sub-grid contact is set to a reasonable length, which can improve the tolerance rate of welding strip alignment deviation and reduce the proportion of broken grids and poor soldering in battery cells during industrial production. Without increasing or significantly increasing the total length of the sub-grid contact, the proportion of broken grids and poor soldering is reduced by increasing the length of the equal-width first portion, while also taking into account the amount of grid line material used. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the surface of the solar cell of this utility model;

[0022] Figure 2 This is a schematic diagram of the structure of the sub-grid antenna of this utility model. Detailed Implementation

[0023] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0024] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0025] Reference Figure 1 and Figure 2 This utility model provides a solar cell 1, wherein at least one side of the cell 1 has a grid pattern 2. The grid pattern 2 includes multiple main grid lines 21, multiple sub-grid lines 22, multiple pads 23, and multiple sub-grid antennas 24. The multiple main grid lines 21 extend along a first direction D1 and are spaced apart in a second direction D2 perpendicular to the first direction D1. The multiple sub-grid lines 22 extend along the second direction D2 perpendicular to the first direction D1 and are spaced apart in the first direction D1. The sub-grid lines 22 intersect with the main grid lines 21. The multiple pads 23 are spaced apart along the main grid lines 21. The multiple sub-grid antennas 24 are disposed at the junction of the main grid lines 21 and the sub-grid lines 24 and extend along the sub-grid lines 22 on both sides of the main grid lines 21. The sub-grid antennas 24 include a first portion 241 of equal width connected to the main grid lines 21. The distance between the far ends of the first portions 241 on both sides of the main grid lines 21 is 0.8 ± 0.05 mm.

[0026] For example, the distance between the far ends of the first portions 241 on both sides of the main grid line 21 can be 0.75mm, 0.76mm, 0.77mm, 0.78mm, 0.79mm, 0.8mm, 0.81mm, 0.82mm, 0.83mm, 0.84mm or 0.85mm.

[0027] In some examples, at least one side of the solar cell 1 has a grid pattern 2, which includes multiple main grid lines 21, multiple sub-grid lines 22, multiple pads 23, and multiple sub-grid antennas 24. The multiple main grid lines 21 extend along a first direction D1 and are spaced apart in a second direction D2 perpendicular to the first direction D1. The multiple sub-grid lines 22 extend along the second direction D2 perpendicular to the first direction D1 and are spaced apart in the first direction D1. The sub-grid lines 22 and the main grid lines 21 are spaced apart. Multiple pads 23 are spaced apart along the main gate line 21, and multiple sub-gate antennas 24 are located at the intersection of the main gate line 21 and the sub-gate line 24, extending along the sub-gate line 22 on both sides of the main gate line 21. The total length of the sub-gate antennas 24 is 1.12 mm. The sub-gate antennas 24 include a first part 241 of equal width connected to the main gate line 21. The extension length L of the first part 241 is greater than or equal to (0.8-d) / 2, where d is the width of the main gate line 21 in millimeters.

[0028] Optionally, the width d of the main grid line 21 is 0.01-0.03 mm. Specifically, the width d of the main grid line 21 can be 0.01 mm, 0.011 mm, 0.012 mm, 0.013 mm, 0.014 mm, 0.015 mm, 0.016 mm, 0.017 mm, 0.018 mm, 0.019 mm, 0.02 mm, 0.021 mm, 0.022 mm, 0.023 mm, 0.024 mm, 0.025 mm, 0.026 mm, 0.027 mm, 0.028 mm, 0.029 mm, or 0.03 mm.

[0029] The first part 241 of the equal width of the sub-grid antenna 24 is set to a reasonable length, which can improve the fault tolerance rate of the welding strip alignment deviation and reduce the proportion of broken grids and poor welding of battery cells in industrial production.

[0030] In some examples, one end of the first portion 241 contacts the main gate line 21, and the other end is connected to the second portion 242. The width of the second portion 242 gradually decreases in the direction away from the first portion 241 along the second direction D2, and the maximum width of the second portion 242 is equal to the width of the first portion 241, which has a width H of 40 ± 4 μm. For example, the second portion 242 may be triangular.

[0031] In some examples, the distance between the distal ends of the sub-gate antennas 24 on both sides of the main gate line 21 is 1.12 ± 0.05 mm. That is, the distance between the distal ends of the second portions 242 on both sides of the main gate line 21 is 1.12 ± 0.05 mm. For example, this distance can be 1.07 mm, 1.08 mm, 1.09 mm, 1.1 mm, 1.11 mm, 1.12 mm, 1.13 mm, 1.14 mm, 1.15 mm, 1.16 mm, or 1.17 mm. Without increasing or significantly increasing the total length of the sub-gate antennas, by increasing the length of the equal-width first portion 241 and shortening the length of the gradient second portion 242, the proportion of broken gates and poor solder joints is reduced, while also taking into account the amount of gate line material used.

[0032] In some examples, the sub-grid antenna 24, sub-grid line 22, and main grid line 21 are integrated into one unit. When screen printing the grid lines, the sub-grid antenna 24, sub-grid line 22, and main grid line 21 can be printed simultaneously.

[0033] In some examples, the sub-gate antenna 24 is located at the intersection of the main gate line 21 and the sub-gate line 22, which do not have pads 23.

[0034] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to the above embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A solar cell, characterized in that, At least one side of the battery cell has a grid pattern, the grid pattern including: Multiple main grid lines extend along a first direction and are spaced apart in a second direction perpendicular to the first direction; Multiple sub-gate lines extend along a second direction perpendicular to the first direction and are spaced apart in the first direction, and the sub-gate lines intersect the main gate lines; Multiple pads are spaced apart along the main gate line; Multiple sub-gate antennas are disposed at the junction of the main gate line and the sub-gate line, and extend along the sub-gate line on both sides of the main gate line. Each sub-gate antenna includes a first portion of equal width connected to the main gate line, and the distance between the distal ends of the first portion on both sides of the main gate line is 0.8±0.05mm.

2. A solar cell, characterized in that, At least one side of the battery cell has a grid pattern, the grid pattern including: Multiple main grid lines extend along a first direction and are spaced apart in a second direction perpendicular to the first direction; Multiple sub-gate lines extend along a second direction perpendicular to the first direction and are spaced apart in the first direction, and the sub-gate lines intersect the main gate lines; Multiple pads are spaced apart along the main gate line; The secondary gate antenna is disposed at the junction of the main gate line and the secondary gate line, and extends along the secondary gate line on both sides of the main gate line. The secondary gate antenna includes a first part of equal width connected to the main gate line. The extension length of the first part is greater than or equal to (0.8-d) / 2, where d is the width of the main gate line in millimeters.

3. The solar cell according to claim 2, characterized in that, The width d of the main grid line is 0.01-0.03 mm.

4. The solar cell according to any one of claims 1-3, characterized in that, One end of the first portion is in contact with the main grid line, and the other end has a second portion, the width of which gradually decreases in a direction away from the first portion along the second direction.

5. The solar cell according to claim 4, characterized in that, The distance between the distal ends of the sub-grid antennas on both sides of the main grid line is 1.12±0.05mm.

6. The solar cell according to any one of claims 1-3, characterized in that, The sub-gate antenna is located at the intersection of the main gate line and the sub-gate line where no pads are provided.

7. The solar cell according to any one of claims 1-3, characterized in that, The width of the first part is 40±4μm.

Images