Solar cell and cell string

Abstract

The utility model discloses a solar cell and a solar cell string. The solar cell comprises a plurality of main grid lines which are arranged on the surface of a silicon wafer, extend along a first direction and are distributed at intervals along a second direction, a plurality of fine grid lines which extend along the second direction and are distributed at intervals along the first direction, and a plurality of bonding pads which are distributed on the main grid lines at intervals along the first direction, the number of the bonding pads located on the same main grid line is larger than or equal to 7, in the first direction, the distance between the bonding pads located at the two ends of the same main grid line and the edge of the silicon wafer is not larger than 9 mm, and the first direction is perpendicular to the second direction. The utility model also discloses a battery piece. According to the utility model, the number of welding spots of each main grid line and the welding strip is increased, the current collection capability is improved, and the EL blackening problem is relieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to photovoltaic cell technical field, concretely relates to a solar cell piece and cell string. BACKGROUND

[0002] Among clean and renewable energy, solar energy is one of the most important energy, solar cell panel as the most important equipment in solar energy utilization, needs strict control its each component quality, to improve the utilization rate of solar energy and prolong the service life of solar cell panel.

[0003] Solar cell surface has grid line, is used for collecting and leading out photoelectric current. Through the conductor such as solder strip, the grid line of solar cell is interconnected into cell string, and then the cell string is packaged into solar cell module. In the production process of solar cell module, EL (electroluminescence) detection is an important quality control process. Through the EL detection of each solar cell module, the defects in the production process can be found in time, such as the design and manufacturing process problems of cell piece.

[0004] The grid line pattern design of the existing solar cell will cause the edge of the cell piece to have a black edge problem during EL testing. SUMMARY

[0005] To solve at least one problem of the prior art, the utility model provides a solar cell piece.

[0006] To achieve the above-mentioned utility model purposes, a technical scheme adopted by the utility model is as follows: a solar cell piece, the surface of the cell piece has a grid line pattern, and the grid line pattern comprises:

[0007] A plurality of main grid lines extend along a first direction and are arranged at intervals in a second direction;

[0008] A plurality of auxiliary grid lines extend along a second direction perpendicular to the first direction and are arranged at intervals in the first direction, and the auxiliary grid lines intersect with the main grid lines;

[0009] A plurality of solder pads are arranged at intervals along the main grid lines, and the number of solder pads on each main grid line is greater than or equal to 7.

[0010] In some embodiments, the front and back surfaces of the cell piece each have two groups of grid line patterns arranged at intervals in the first direction, and the two groups of grid line patterns have a splitting area therebetween, the solder pads include a first end portion pad closest to the edge of the cell piece and a second end portion pad closest to the splitting area, and the distance from the center of the first end portion pad to the edge of the cell piece and the distance from the center of the second end portion pad to the central axis of the splitting area are both not greater than 9 mm.

[0011] In some embodiments, the size of the cell sheet is (182±2) mm x (182±2) mm,

[0012] The number of pads on the main grid line is 7,

[0013] On the front side of the cell sheet, the distance from the center of the first end pad to the edge of the cell sheet is 7.7±0.1 mm;

[0014] On the back side of the cell sheet, the distance from the center of the first end pad to the edge of the cell sheet is 8.69±0.1 mm.

[0015] In some embodiments, on the front side of the cell sheet, the pitch of the centers of the second end pads of the two groups of grid line patterns along the first direction is 15.35±0.1 mm; on the back side of the cell sheet, the pitch of the centers of the second end pads of the two groups of grid line patterns along the first direction is 17.17±0.1 mm.

[0016] In some embodiments, the size of the cell sheet is (182±2) mm x (210±2) mm, the long side of the cell sheet extends along the first direction,

[0017] The number of pads on the main grid line is 8,

[0018] On the front side of the cell sheet, the distance from the center of the first end pad to the edge of the cell sheet is 7.69±0.1 mm;

[0019] On the back side of the cell sheet, the distance from the center of the first end pad to the edge of the cell sheet is 8.8±0.1 mm.

[0020] In some embodiments, on the front side of the cell sheet, the pitch of the centers of the second end pads of the two groups of grid line patterns along the first direction is 15.12±0.1 mm; on the back side of the cell sheet, the pitch of the centers of the second end pads of the two groups of grid line patterns along the first direction is 17.11±0.1 mm.

[0021] In some embodiments, the first end pad and the second end pad are respectively further connected to a flow guide part, the flow guide part comprises a first flow guide segment and a second flow guide segment, the first flow guide segment and the second flow guide segment have a gap therebetween, and the gap gradually increases away from the pad.

[0022] In some embodiments, there is an intermediate pad between the first end pad and the second end pad, and the size of the first end pad and the second end pad is greater than the size of the intermediate pad.

[0023] In some embodiments, the first end pad, the second end pad and the middle pad are a rectangle with four corners rounded.

[0024] In some embodiments, for a battery piece with a size of (182±2) mm x (182±2) mm, the maximum length of the first end pad and the second end pad is 1.2±0.05 mm, the maximum width is 0.75±0.05 mm, and the diameter of the rounded corner of the first end pad and the second end pad is 0.46±0.03 mm; the maximum length of the middle pad is 0.8±0.05 mm, the maximum width is 0.55±0.05 mm, and the diameter of the rounded corner of the middle pad is 0.37±0.03 mm.

[0025] In some embodiments, for a battery piece with a size of (182±2) mm x (210±2) mm, the maximum length of the first end pad and the second end pad is 1.2±0.05 mm, the maximum width is 0.75±0.05 mm, and the diameter of the rounded corner of the first end pad and the second end pad is 0.3±0.03 mm; the maximum length of the middle pad is 0.8±0.05 mm, the maximum width is 0.55±0.05 mm, and the diameter of the rounded corner of the middle pad is 0.3±0.03 mm.

[0026] Another technical solution adopted by the utility model is: a solar cell piece, the front and back of the cell piece each has two groups of grid line patterns arranged at intervals in the first direction, the two groups of grid line patterns have a piece separation area therebetween, the grid line pattern comprises a plurality of main grid lines extending along the first direction and arranged at intervals in the second direction, a plurality of auxiliary grid lines extending along the second direction perpendicular to the first direction and arranged at intervals in the first direction and intersecting the main grid lines, a pad arranged at intervals along the main grid line, the pad comprises a first end pad closest to the edge of the cell piece and a second end pad closest to the piece separation area, the distance from the center of the first end pad to the edge of the cell piece and the distance from the center of the second end pad to the central axis of the piece separation area are both not greater than 9 mm.

[0027] In some embodiments, for a battery piece with a size of (182±2) mm x (182±2) mm, on the front of the battery piece, the distance from the center of the first end pad to the edge of the battery piece is 7.7±0.1 mm, and the interval of the centers of the second end pads of the two groups of grid line patterns along the first direction is 15.35±0.1 mm; on the back of the battery piece, the distance from the center of the first end pad to the edge of the battery piece is 8.69±0.1 mm, and the interval of the centers of the second end pads of the two groups of grid line patterns along the first direction is 17.17±01. mm;

[0028] For a battery cell with a specification of (182±2)mm×(210±2)mm, the long side of the battery cell extends along the first direction. On the front of the battery cell, the distance from the center of the first end pad to the edge of the battery cell is 7.69±0.1mm, and the spacing between the centers of the second end pads of the two groups of the grid line patterns along the first direction is 15.12±0.1mm. On the back of the battery cell, the distance from the center of the first end pad to the edge of the battery cell is 8.8±0.1mm, and the spacing between the centers of the second end pads of the two groups of the grid line patterns along the first direction is 17.11±01.mm.

[0029] The solar cell string includes a plurality of half-cells obtained by dividing the cell along the cell segmentation area, and the half-cells are connected in series.

[0030] Compared with the prior art, the advantages of the present invention are:

[0031] (1) Compared with the existing 6-pad design, the present invention increases the number of pads and the number of solder joints between each main grid line and the solder strip, thereby improving the current collection capacity and alleviating the EL blackening problem;

[0032] (2) The distance from the end pad of the main grid line to the edge of the cell and the segmentation area is shortened, the current transmission distance in the edge area of ​​the solar cell is shortened, the current collection efficiency in the edge area of ​​the cell is improved, and the EL blackening problem of the cell is alleviated. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 Schematic diagram of the front side of a solar cell in some examples of the present invention;

[0034] Figure 2 for Figure 1 A magnified view of position A in the middle;

[0035] Figure 3 for Figure 1 Enlarged view of position B in the middle. DETAILED DESCRIPTION

[0036] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0037] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0038] Referring to Figures 1 to 3 In some examples, the surface of the cell sheet 1 has a grid line pattern 2, the grid line pattern 2 includes a plurality of main grid lines 21, a plurality of auxiliary grid lines 22, and a plurality of pads, the plurality of main grid lines 21 extend along a first direction D1 and are arranged at intervals in a second direction D2, the plurality of auxiliary grid lines 22 extend along a second direction D2 perpendicular to the first direction D1 and are arranged at intervals in the first direction D1, the auxiliary grid lines 22 intersect the main grid lines 21, and the plurality of pads are arranged at intervals along the main grid lines 21, the number of pads on each main grid line 21 is greater than or equal to 7.

[0039] Compared with the prior art, the present disclosure increases the number of pads, increases the number of solder joints between each main grid line and the solder strip, improves the current collection capability, and alleviates the EL blackening problem.

[0040] In some examples, the front and back of the cell sheet 1 each has two groups of grid line patterns 2 arranged at intervals in the first direction D1, and the two groups of grid line patterns 2 have a splitting area 3 therebetween. The pads include a first end pad 231 closest to the edge of the cell sheet 1 and a second end pad 232 closest to the splitting area 3, the distance L1 from the center of the first end pad 231 to the edge of the cell sheet 1, and the distance L2 from the center of the second end pad 232 to the center axis 30 of the splitting area 3 are both not greater than 9 mm.

[0041] By shortening the distance from the first end pad 231 to the edge of the cell sheet 1, the distance from the second end pad 232 to the center axis 30 of the splitting area 3, and the distance from the end pad of the main grid line to the edge of the cell sheet and the splitting area 3, the current transmission distance of the edge area of the half-cell in the solar cell module is shortened, the current collection efficiency of the edge area of the half-cell sheet is improved, and the EL blackening problem of the cell is alleviated.

[0042] In some examples, when the size of the battery sheet 1 is (182±2) mm x (182±2) mm, the number of pads on the main grid line 21 is 7. That is, there are also 5 intermediate pads 233 between the first end pad 231 and the second end pad 232. On the front surface of the battery sheet 1, the distance L1 from the center of the first end pad 231 to the edge of the battery sheet 1 is 7.7±0.1 mm, and the pitch of the centers of the second end pads 232 of the two sets of grid line patterns 2 along the first direction D1 is 15.35±0.1 mm; on the back surface of the battery sheet 1, the distance L1 from the center of the first end pad 231 to the edge of the battery sheet is 8.69±0.1 mm, and the pitch of the centers of the second end pads 232 of the two sets of grid line patterns 2 along the first direction D1 is 17.17±0.1 mm.

[0043] For example, the distance L1 from the center of the first end pad 231 to the edge of the cell tab 1 can be 7.6 mm, 7.61 mm, 7.62 mm, 7.63 mm, 7.64 mm, 7.65 m, 7.66 mm, 7.67 mm, 7.68 mm, 7.69 mm, 7.7 mm, 7.71 mm, 7.72 mm, 7.73 mm, 7.74 mm, 7.75 mm, 7.76 mm, 7.77 mm, 7.78 mm, 7.79 mm, or 7.8 mm. On the front side of the cell tab 1, the pitch of the centers of the second end pads 232 of the two sets of grid line patterns 2 along the first direction D1 can be 15.25 mm, 15.26 mm, 15.27 mm, 15.28 mm, 15.29 mm, 15.30 mm, 15.31 mm, 15.32 mm, 15.33 mm, 15.34 mm, 15.35 mm, 15.36 mm, 15.37 mm, 15.38 mm, 15.39 mm, 15.4 mm, 15.41 mm, 15.42 mm, 15.43 mm, 15.44 mm, or 15.45 mm. On the back side of the cell tab 1, the distance L1 from the center of the first end pad 231 to the edge of the cell tab can be 8.59 mm, 8.6 mm, 8.61 mm, 8.62 mm, 8.63 mm, 8.64 mm, 8.65 mm, 8.66 mm, 8.67 mm, 8.68 mm, 8.69 mm, 8.7 mm, 8.71 mm, 8.72 mm, 8.73 mm, 8.74 mm, 8.75 mm, 8.76 mm, 8.77 mm, 8.78 mm, or 8.79 mm, and the pitch of the centers of the second end pads 232 of the two sets of grid line patterns 2 along the first direction D1 can be 17.07 mm, 17.08 mm, 17.09 mm, 17.1 mm, 17.11 mm, 17.12 mm, 17.13 mm, 17.14 mm, 17.15 mm, 17.16 mm, 17.17 mm, 17.18 mm, 17.19 mm, 17.2 mm, 17.21 mm, 17.22 mm, 17.23 mm, 17.24 mm, 17.25 mm, 17.26 mm, or 17.27 mm.

[0044] In some examples, when the size of the battery sheet 1 is (182±2) mm x (210±2) mm, the long side of the battery sheet 1 extends along the first direction, and the number of pads on the main grid line 21 is 8. That is, there are 6 intermediate pads 233 between the first end pad 231 and the second end pad 232. On the front surface of the battery sheet 1, the distance L1 from the center of the first end pad 231 to the edge of the battery sheet 1 is 7.69±0.1 mm, and the pitch of the centers of the second end pads 232 of the two sets of grid line patterns 2 along the first direction D1 is 15.12±0.1 mm; on the back surface of the battery sheet 1, the distance L1 from the center of the first end pad 231 to the edge of the battery sheet is 8.8±0.1 mm, and the pitch of the centers of the second end pads 232 of the two sets of grid line patterns 2 along the first direction D1 is 17.11±0.1 mm.

[0045] For example, on the front side of the cell sheet 1, the distance L1 from the center of the first end pad 231 to the edge of the cell sheet 1 can be 7.59 mm, 7.6 mm, 7.61 mm, 7.62 mm, 7.63 mm, 7.64 mm, 7.65 mm, 7.66 mm, 7.67 mm, 7.68 mm, 7.69 mm, 7.7 mm, 7.71 mm, 7.72 mm, 7.73 mm, 7.74 mm, 7.75 mm, 7.76 mm, 7.77 mm, 7.78 mm, or 7.79 mm, and the pitch of the centers of the second end pads 232 of the two sets of grid line patterns 2 along the first direction D1 can be 15.02 mm, 15.03 mm, 15.04 mm, 15.05 mm, 15.06 mm, 15.07 mm, 15.08 mm, 15.09 mm, 15.1 mm, 15.11 mm, 15.12 mm, 15.13 mm, 15.14 mm, 15.15 mm, 15.16 mm, 15.17 mm, 15.18 mm, 15.19 mm, 15.2 mm, 15.21 mm, or 15.22 mm. On the back side of the cell sheet 1, the distance L1 from the center of the first end pad 231 to the edge of the cell sheet can be 8.7 mm, 8.71 mm, 8.72 mm, 8.73 mm, 8.74 mm, 8.75 mm, 8.76 mm, 8.77 mm, 8.78 mm, 8.79 mm, 8.8 mm, 8.81 mm, 8.82 mm, 8.83 mm, 8.84 mm, 8.85 mm, 8.86 mm, 8.87 mm, 8.88 mm, 8.89 mm, or 8.9 mm, and the pitch of the centers of the second end pads 232 of the two sets of grid line patterns 2 along the first direction D1 can be 17.01 mm, 17.02 mm, 17.03 mm, 17.04 mm, 17.05 mm, 17.06 mm, 17.07 mm, 17.08 mm, 17.09 mm, 17.1 mm, 17.11 mm, 17.12 mm, 17.13 mm, 17.14 mm, 17.15 mm, 17.16 mm, 17.17 mm, 17.18 mm, 17.19 mm, 17.2 mm, or 17.21 mm.

[0046] In some examples, the first end pad 231 and the second end pad 232 have an intermediate pad 233 therebetween, and the size of the first end pad 231 and the second end pad 232 is greater than the size of the intermediate pad 233.

[0047] In some examples, the first end pad 231, the second end pad 232, and the intermediate pad 233 are rectangular with rounded corners at the four corners.

[0048] In some examples, for the battery piece 1 with a size of (182±2) mm x (182±2) mm, the maximum length of the first end pad 231 and the second end pad 232 is 1.2±0.05 mm, the maximum width is 0.75±0.05 mm, and the round corner diameter of the first end pad 231 and the second end pad 232 is 0.46±0.03 mm; the maximum length of the middle pad 233 is 0.8±0.05 mm, the maximum width is 0.55±0.05 mm, and the round corner diameter of the middle pad 233 is 0.37±0.03 mm.

[0049] For example, the maximum length of the first end pad 231 and the second end pad 232 can be 1.15 mm, 1.16 mm, 1.17 mm, 1.18 mm, 1.19 mm, 1.2 mm, 1.21 mm, 1.22 mm, 1.23 mm, 1.24 mm, or 1.25 mm, the maximum width can be 0.7 mm, 0.71 mm, 0.72 mm, 0.73 mm, 0.74 mm, 0.75 mm, 0.76 mm, 0.77 mm, 0.78 mm, 0.79 mm, or 0.8 mm, and the round corner diameter of the first end pad 231 and the second end pad 232 can be 0.43 mm, 0.44 mm, 0.45 mm, 0.46 mm, 0.47 mm, 0.48 mm, or 0.49 mm. The maximum length of the middle pad 233 can be 0.75 mm, 0.76 mm, 0.77 mm, 0.78 mm, 0.79 mm, 0.8 mm, 0.81 mm, 0.82 mm, 0.83 mm, 0.84 mm, or 0.85 mm, the maximum width can be 0.5 mm, 0.51 mm, 0.52 mm, 0.53 mm, 0.54 mm, 0.55 mm, 0.56 mm, 0.57 mm, 0.58 mm, 0.59 mm, or 0.6 mm, and the round corner diameter of the middle pad 233 can be 0.34 mm, 0.35 mm, 0.36 mm, 0.37 mm, 0.38 mm, 0.39 mm, or 0.4 mm.

[0050] In some examples, for the battery piece 1 with a size of (182±2) mm x (210±2) mm, the maximum length of the first end pad 231 and the second end pad 232 is 1.2±0.05 mm, the maximum width is 0.75±0.05 mm, and the round corner diameter of the first end pad 231 and the second end pad 232 is 0.3±0.03 mm; the maximum length of the middle pad 233 is 0.8±0.05 mm, the maximum width is 0.55±0.05 mm, and the round corner diameter of the middle pad 233 is 0.3±0.03 mm.

[0051] For example, the first end pad 231 and the second end pad 232 can have a maximum length of 1.15 mm, 1.16 mm, 1.17 mm, 1.18 mm, 1.19 mm, 1.2 mm, 1.21 mm, 1.22 mm, 1.23 mm, 1.24 mm, or 1.25 mm, a maximum width of 0.7 mm, 0.71 mm, 0.72 mm, 0.73 mm, 0.74 mm, 0.75 mm, 0.76 mm, 0.77 mm, 0.78 mm, 0.79 mm, or 0.8 mm, and a fillet diameter of 0.27 mm, 0.28 mm, 0.29 mm, 0.3 mm, 0.31 mm, 0.32 mm, or 0.33 mm. The intermediate pad 233 can have a maximum length of 0.75 mm, 0.76 mm, 0.77 mm, 0.78 mm, 0.79 mm, 0.8 mm, 0.81 mm, 0.82 mm, 0.83 mm, 0.84 mm, or 0.85 mm, a maximum width of 0.5 mm, 0.51 mm, 0.52 mm, 0.53 mm, 0.54 mm, 0.55 mm, 0.56 mm, 0.57 mm, 0.58 mm, 0.59 mm, or 0.6 mm, and a fillet diameter of 0.27 mm, 0.28 mm, 0.29 mm, 0.3 mm, 0.31 mm, 0.32 mm, or 0.33 mm.

[0052] In some examples, the first end pad 231 and the second end pad 232 are also connected to a flow guide 25, which includes a first flow guide segment 251 and a second flow guide segment 252 with a gap between the first flow guide segment 251 and the second flow guide segment 252 that increases as it moves away from the pads.

[0053] The utility model discloses further provide a kind of battery string, including multiple half battery piece obtained by dividing the slice area of preceding battery piece, these half battery piece are connected in series.

[0054] The above description of the disclosed embodiments enables one of ordinary skill in the art to make or use the application. Various modifications to the above-described embodiments will be apparent to those with ordinary skill in the art, and the general principles defined herein can be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended 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: The surface of the cell has a grid line pattern, and the grid line pattern includes: A plurality of main grid lines extending along a first direction and spaced apart in a second direction; a plurality of auxiliary grid lines extending along a second direction perpendicular to the first direction and spaced apart in the first direction, the auxiliary grid lines intersecting the main grid lines; The pads are arranged at intervals along the main grid lines, and the number of pads on each main grid line is greater than or equal to 7.

2. A solar cell according to claim 1, characterized in that: The front and back sides of the battery cell each have two groups of grid line patterns arranged at intervals in the first direction, and a segmentation area is provided between the two groups of grid line patterns. The welding pads include a first end welding pad closest to the edge of the battery cell and a second end welding pad closest to the segmentation area. The distance from the center of the first end welding pad to the edge of the battery cell and the distance from the center of the second end welding pad to the central axis of the segmentation area are both no more than 9 mm.

3. A solar cell according to claim 2, characterized in that: The specifications of the battery cell are (182±2) mm×(182±2) mm. The number of pads on the main grid line is 7. On the front side of the cell, the distance from the center of the first end pad to the edge of the cell is 7.7±0.1 mm; On the back side of the solar cell, the distance from the center of the first end pad to the edge of the solar cell is 8.69±0.1 mm.

4. A solar cell according to claim 3, characterized in that: The specifications of the battery cell are (182±2) mm×(182±2) mm. The number of pads on the main grid line is 7. On the front side of the cell, the spacing between the centers of the second end pads of the two groups of the grid line patterns along the first direction is 15.35±0.1 mm; On the back side of the solar cell, the spacing between the centers of the second end pads of the two groups of the grid line patterns along the first direction is 17.17±0.1 mm.

5. The solar cell according to claim 2, characterized in that: The size of the battery cell is (182±2) mm×(210±2) mm, and the long side of the battery cell extends along the first direction. The number of pads on the main grid line is 8. On the front side of the cell, the distance from the center of the first end pad to the edge of the cell is 7.69±0.1 mm; On the back side of the cell, the distance from the center of the first end pad to the edge of the cell is 8.8±0.1 mm.

6. The solar cell according to claim 5, characterized in that: The size of the battery cell is (182±2) mm×(210±2) mm, and the long side of the battery cell extends along the first direction. The number of pads on the main grid line is 8. On the front side of the cell, the spacing between the centers of the second end pads of the two groups of the grid line patterns along the first direction is 15.12±0.1 mm; On the back side of the solar cell, the spacing between the centers of the second end pads of the two groups of the grid line patterns along the first direction is 17.11±0.1 mm.

7. The solar cell according to claim 2, characterized in that: The first end pad and the second end pad are also connected to a guide portion respectively. The guide portion includes a first guide segment and a second guide segment. There is a gap between the first guide segment and the second guide segment. The gap gradually increases as it moves away from the pad.

8. A solar cell according to any one of claims 2 to 7, characterized in that: An intermediate pad is provided between the first end pad and the second end pad, and sizes of the first end pad and the second end pad are larger than that of the intermediate pad.

9. The solar cell according to claim 8, characterized in that: The first end pad, the second end pad and the middle pad are rectangular with four rounded corners.

10. The solar cell according to claim 9, characterized in that: For a battery cell with a specification of (182±2)mm×(182±2)mm, the maximum length of the first end pad and the second end pad is 1.2±0.05mm, the maximum width is 0.75±0.05mm, and the fillet diameter of the first end pad and the second end pad is 0.46±0.03mm; the maximum length of the middle pad is 0.8±0.05mm, the maximum width is 0.55±0.05mm, and the fillet diameter of the middle pad is 0.37±0.03mm.

11. The solar cell according to claim 9, characterized in that: For a battery cell with a specification of (182±2)mm×(210±2)mm, the maximum length of the first end pad and the second end pad is 1.2±0.05mm, the maximum width is 0.75±0.05mm, and the fillet diameter of the first end pad and the second end pad is 0.3±0.03mm; the maximum length of the middle pad is 0.8±0.05mm, the maximum width is 0.55±0.05mm, and the fillet diameter of the middle pad is 0.3±0.03mm.

12. A solar cell, characterized in that: The front and back sides of the battery cell each have two groups of grid line patterns arranged at intervals in the first direction, and a segmentation area is provided between the two groups of grid line patterns. The grid line pattern includes a plurality of main grid lines extending along the first direction and spaced apart in the second direction, a plurality of secondary grid lines extending along a second direction perpendicular to the first direction and spaced apart in the first direction and crossing the main grid lines, and welding pads spaced apart along the main grid lines. The welding pads include a first end welding pad closest to the edge of the battery cell and a second end welding pad closest to the segmentation area. The distance from the center of the first end welding pad to the edge of the battery cell and the distance from the center of the second end welding pad to the central axis of the segmentation area are both no more than 9 mm.

13. The solar cell according to claim 12, wherein: For a cell with a specification of (182±2) mm×(182±2) mm, on the front side of the cell, the distance from the center of the first end pad to the edge of the cell is 7.7±0.1 mm, and the spacing between the centers of the second end pads of the two groups of the grid line patterns along the first direction is 15.35±0.1 mm. On the back side of the cell, the distance from the center of the first end pad to the edge of the cell is 8.69±0.1 mm, and the spacing between the centers of the second end pads of the two groups of the grid line patterns along the first direction is 17.17±01.mm. For a battery cell with a specification of (182±2)mm×(210±2)mm, the long side of the battery cell extends along the first direction. On the front of the battery cell, the distance from the center of the first end pad to the edge of the battery cell is 7.69±0.1mm, and the spacing between the centers of the second end pads of the two groups of the grid line patterns along the first direction is 15.12±0.1mm. On the back of the battery cell, the distance from the center of the first end pad to the edge of the battery cell is 8.8±0.1mm, and the spacing between the centers of the second end pads of the two groups of the grid line patterns along the first direction is 17.11±01.mm.

14. A solar cell string, characterized in that The invention comprises a plurality of half-cells obtained by dividing the cell along the dividing area of ​​the cell according to any one of claims 1 to 7 or 12 to 13, wherein the half-cells are connected in series.

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