Solar cell

Abstract

The utility model discloses a solar cell, the surface of which is provided with a grid line pattern. 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 perpendicular to the first direction, a plurality of auxiliary grid lines which extend along the second direction and are arranged at intervals in the first direction, and a plurality of bonding pads which are arranged at intervals on the main grid lines; the main grid line comprises a first connecting line and a second connecting line which are arranged in parallel at an interval, and the first connecting line and the second connecting line are respectively crossed with the auxiliary grid line. According to the utility model, the main grid line is divided into the two parallel connecting lines which are arranged at intervals, and the two connecting lines are respectively crossed with the auxiliary grid line and are lapped with the bonding pad to form a double-loop design, so that when an assembly is subjected to series welding, even if the grid line is welded to be broken at a place where a welding strip passes, current can be transmitted to the bonding pad through the double-loop, and then is transmitted to the welding strip through the bonding pad; and an open circuit condition is avoided.

Description

A solar cell Technical Field

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

[0002] As the consumption of metallization paste for solar cells continues to decrease, existing printed graphics designs for solar cells have encountered the problem of broken grids in EL welding at the module end. This is mainly caused by the back contact being broken by high temperature. During module string welding, the solder ribbon and the contact paste are fused together, which will adsorb the surrounding paste. As the paste consumption continues to decrease, the height of the contact becomes lower and lower, and the silver content is insufficient. The paste outside the solder ribbon area is adsorbed by the solder ribbon, resulting in an open circuit phenomenon, and the EL shows a broken grid defect. Summary of the Invention

[0003] To address at least one problem in the prior art, this utility model provides a solar cell.

[0004] To achieve the above-mentioned utility model objectives, the present utility model adopts the following technical solution: a solar cell with a grid pattern on its surface. The grid pattern includes multiple main grid lines extending along a first direction and spaced apart in a second direction perpendicular to the first direction, multiple sub-grid lines extending along the second direction and spaced apart in the first direction, and multiple pads spaced apart along the main grid lines. The main grid lines include a first connecting line and a second connecting line arranged in parallel and spaced apart, and the first connecting line and the second connecting line intersect the sub-grid lines respectively.

[0005] Furthermore, the pads include two end pads located at the outermost edge of the gate pattern and a plurality of intermediate pads located between the two end pads, with the same end of the first connecting line and the second connecting line overlapping the two sides of the end pads respectively.

[0006] Furthermore, the intermediate pad includes a pad body, and the upper and lower sides of the two ends of the pad body extend a first contact angle and a second contact angle away from the main gate line along the second direction, respectively. The first connecting line of the main gate line overlaps with the first contact angle and the second contact angle at one end of the intermediate pad in sequence, and the second connecting line of the main gate line overlaps with the first contact angle and the second contact angle at the other end of the intermediate pad in sequence.

[0007] Furthermore, a gap is formed between the first contact angle and the second contact angle, and the sub-gate line is disposed in the gap and overlaps with the pad body.

[0008] Furthermore, the width of the gap, H2, is 0.18 ± 0.05 mm.

[0009] Furthermore, the width of the first contact angle is equal to the width of the second contact angle, and the width H1 of the first contact angle and the second contact angle is 0.15 ± 0.05 mm;

[0010] The length of the first contact angle is equal to the length of the second contact angle, and the length L1 of the first contact angle and the second contact angle is 0.2 ± 0.05 mm.

[0011] Furthermore, the spacing L between the first connecting line and the second connecting line is 1.0 ± 0.1 mm, and the width of the first connecting line and the second connecting line is 15 ± 5 μm.

[0012] Furthermore, the grid pattern has 200 to 240 sub-grid lines.

[0013] Furthermore, the grid pattern also includes multiple secondary grid antennas disposed at the intersection of the main grid line and the secondary grid line;

[0014] When the sub-gate antenna is located at the intersection of the first connecting line and the sub-gate line, the sub-gate antenna extends along the sub-gate line on one side of the first connecting line in a direction away from the second connecting line.

[0015] When the sub-gate antenna is located at the intersection of the second connecting line and the sub-gate line, the sub-gate antenna extends along the sub-gate line on one side of the second connecting line in a direction away from the first connecting line.

[0016] Furthermore, the sub-gate antenna includes a first portion of equal width connected at one end to the main gate line and a second portion connected at the other end of the first portion, wherein the width of the second portion gradually decreases in the direction away from the first portion along the second direction.

[0017] Compared with the prior art, the advantages of this utility model are as follows: This utility model splits the main grid line into two parallel and spaced connecting lines. The two connecting lines cross the sub-grid line and overlap with the pads to form a "dual-loop" design. During component serial soldering, even if the grid line is broken where the solder ribbon passes, the current can still be transmitted to the pads through the "dual loop" and then to the solder ribbon through the pads, without any open circuit. Attached Figure Description

[0018] Figure 1 is a schematic diagram of the structure of a solar cell in some examples of this utility model;

[0019] Figure 2 is an enlarged view of position A in Figure 1;

[0020] Figure 3 is a schematic diagram of the structure of the intermediate pad of the utility model;

[0021] Figure 4 is a schematic diagram of the sub-grid antenna of the utility model. Detailed Implementation

[0022] 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.

[0023] 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.

[0024] Referring to Figures 1 to 4, in some examples, a solar cell 1 has a grid pattern 2 on its surface. The grid pattern 2 includes multiple main grid lines 21 extending along a first direction D1 and spaced apart in a second direction D2 perpendicular to the first direction D1, multiple sub-grid lines 22 extending along the second direction D2 and spaced apart in the first direction D1, and multiple pads 23 spaced apart along the main grid lines 21. The main grid lines 21 include first connecting lines 211 and second connecting lines 212 arranged in parallel and spaced apart. The first connecting lines 211 and the second connecting lines 212 intersect the sub-grid lines 22 respectively.

[0025] This invention splits the main grid line 21 into two parallel and spaced connecting lines, a first connecting line 211 and a second connecting line 212. The first connecting line 211 and the second connecting line 212 intersect with the sub-grid line 22 and overlap with the pad 23, forming a "dual-loop" design. During component serial soldering, even if the grid line is broken where the solder ribbon passes, the current can still be transmitted to the pad through the "dual-loop" and then to the solder ribbon through the pad, without any open circuit.

[0026] Furthermore, the pad 23 includes two end pads 231 located at the outermost edge of the gate pattern 2 and a plurality of intermediate pads 232 located between the two end pads 231, with the same end of the first connecting line 211 and the second connecting line 212 respectively overlapping on both sides of the end pads 231.

[0027] Furthermore, the intermediate pad 232 includes a pad body 2320. The upper and lower sides of the two ends of the pad body 2320 extend a first contact angle 2321 and a second contact angle 2322 respectively along the second direction D2 away from the main gate line 21. The first connecting line 211 of the main gate line 21 overlaps with the first contact angle 2321 and the second contact angle 2322 at one end of the intermediate pad 232, and the second connecting line 212 of the main gate line 21 overlaps with the first contact angle 2321 and the second contact angle 2322 at the other end of the intermediate pad 232, so as to ensure that the pad 23 overlaps well with the first connecting line 211 and the second connecting line 212.

[0028] Furthermore, a gap 2323 is formed between the first contact angle 2321 and the second contact angle 2322, and the sub-gate line 22 is disposed in the gap 2323 and overlaps with the pad body 2320.

[0029] Furthermore, the width H2 of the gap 2323 is 0.18 ± 0.05 mm.

[0030] Furthermore, the width of the first contact angle 2321 is equal to the width of the second contact angle 2322, and the width H1 of the first contact angle 2321 and the second contact angle 2322 is 0.15 ± 0.05 mm. The length of the first contact angle 2321 is equal to the length of the second contact angle 2322, and the length L1 of the first contact angle 2321 and the second contact angle 2322 is 0.2 ± 0.05 mm.

[0031] Furthermore, the distance L between the first connecting line 211 and the second connecting line 212 is 1.0±0.1mm, and the width of the two connecting lines themselves is 15±5um.

[0032] Furthermore, due to the "dual-loop" design of the main grid line 21, some current will bypass to the solder strip through the dual loop, increasing the transmission resistance. This problem of increased resistance due to the "dual-loop" design can be solved by increasing the number of sub-grid lines 22 to enhance contact. A conventional solar cell has 160-200 sub-grid lines 22 in one grid pattern 2, while the grid pattern 2 of this invention has 200-240 sub-grid lines 22.

[0033] Furthermore, as the number of sub-gate lines 22 in the gate pattern 2 increases, the width of each sub-gate line 22 decreases as the number of sub-gate lines 22 increases. Preferably, for every 10 additional sub-gate lines 22 in the gate pattern 2, the width of each sub-gate line 22 decreases by 0.5 μm.

[0034] Furthermore, as the number of sub-gate lines 22 in the gate pattern 2 increases, the height of each sub-gate line 22 decreases as the number of sub-gate lines 22 increases. Preferably, for every 10 additional sub-gate lines 22 in the gate pattern 2, the height of each sub-gate line 22 decreases by 0.2 μm.

[0035] By reducing the width and / or height of the sub-grid line 22, the increase in slurry consumption caused by the increase in the number of sub-grid lines 22 can be reduced.

[0036] Furthermore, the grid pattern 2 also includes a plurality of secondary grid antennas 24 disposed at the junction of the main grid line 21 and the secondary grid line 22. When the secondary grid antenna 24 is disposed at the junction of the first connecting line 211 and the secondary grid line 22, the secondary grid antenna 24 extends along the secondary grid line 22 on one side of the first connecting line 211 in a direction away from the second connecting line 212; when the secondary grid antenna 24 is disposed at the junction of the second connecting line 212 and the secondary grid line 22, the secondary grid antenna 24 extends along the secondary grid line 22 on one side of the second connecting line 212 in a direction away from the first connecting line 211.

[0037] Furthermore, the sub-gate antenna 24 includes a first portion 241 of equal width connected to the main gate line 21 at one end and a second portion 242 connected to the other end of the first portion 241. The width of the second portion 242 gradually decreases in the direction away from the first portion 241 along the second direction D2, so as to ensure good overlap between the first connecting line 211 and the sub-gate line 22, and between the second connecting line 212 and the sub-gate line 22.

[0038] Furthermore, the width of the first part 241 is H3, which is 0.06 ± 0.02 mm, and the width of the second part 242 gradually decreases from 0.06 mm to 0.03 mm.

[0039] Furthermore, the total length of the sub-gate antenna 24 is 0.16±0.03mm, of which the length L2 of the first part 241 is 0.1±0.03mm and the length L3 of the second part 242 is 0.06±0.02mm.

[0040] Of course, the main grid line 21 of this utility model can also be divided into three or more parallel and spaced connecting lines.

[0041] 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, The surface of the battery cell (1) has a grid pattern (2), which includes multiple main grid lines (21) extending along a first direction (D1) and spaced apart in a second direction (D2) perpendicular to the first direction (D1), multiple sub-grid lines (22) extending along the second direction (D2) and spaced apart in the first direction (D1), and multiple pads (23) spaced apart along the main grid lines (21). The main grid lines (21) include a first connecting line (211) and a second connecting line (212) spaced apart in parallel, and the first connecting line (211) and the second connecting line (212) intersect the sub-grid lines (22) respectively. The pads (23) include two end pads (231) located at the outermost edge of the grid pattern (2) and multiple intermediate pads located between the two end pads (231). 232), the same end of the first connecting line (211) and the second connecting line (212) are respectively connected to both sides of the end pad (231); the middle pad (232) includes a pad body (2320), the upper and lower sides of the two ends of the pad body (2320) extend a first contact angle (2321) and a second contact angle (2322) away from the main gate line (21) along the second direction (D2), the first connecting line (211) of the main gate line (21) is connected to the first contact angle (2321) and the second contact angle (2322) at one end of the middle pad (232), and the second connecting line (212) of the main gate line (21) is connected to the first contact angle (2321) and the second contact angle (2322) at the other end of the middle pad (232).

2. The solar cell according to claim 1, characterized in that, A gap (2323) is formed between the first contact angle (2321) and the second contact angle (2322), and the sub-gate line (22) is disposed in the gap (2323) and overlaps with the pad body (2320).

3. The solar cell according to claim 2, characterized in that, The width H2 of the gap (2323) is 0.18 ± 0.05 mm.

4. The solar cell according to claim 1, characterized in that, The width of the first contact angle (2321) is equal to the width of the second contact angle (2322), and the width H1 of the first contact angle (2321) and the second contact angle (2322) is 0.15±0.05mm; the length of the first contact angle (2321) is equal to the length of the second contact angle (2322), and the length L1 of the first contact angle (2321) and the second contact angle (2322) is 0.2±0.05mm.

5. The solar cell according to claim 1, characterized in that, The distance L between the first connecting line (211) and the second connecting line (212) is 1.0 ± 0.1 mm, and the width of the first connecting line (211) and the second connecting line (212) is 15 ± 5 μm.

6. The solar cell according to claim 1, characterized in that, The grid pattern (2) has 200 to 240 sub-grid lines (22).

7. The solar cell according to any one of claims 1 to 6, characterized in that, The grid pattern (2) also includes a plurality of sub-grid antennas (24) disposed at the junction of the main grid line (21) and the sub-grid line (22); when the sub-grid antenna (24) is disposed at the junction of the first connecting line (211) and the sub-grid line (22), the sub-grid antenna (24) extends along the sub-grid line (22) on one side of the first connecting line (211) in a direction away from the second connecting line (212); when the sub-grid antenna (24) is disposed at the junction of the second connecting line (212) and the sub-grid line (22), the sub-grid antenna (24) extends along the sub-grid line (22) on one side of the second connecting line (212) in a direction away from the first connecting line (211).

8. The solar cell according to claim 7, characterized in that, The sub-grid antenna (24) includes a first portion (241) of equal width connected at one end to the main grid line (21) and a second portion (242) connected at the other end of the first portion (241), the width of the second portion (242) gradually decreasing in the direction away from the first portion (241) along the second direction (D2).

Images