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 first printing pattern, a second printing pattern, a third printing pattern and a fourth printing pattern, comprising a plurality of main grid lines, harpoon-shaped structures connected to the ends of the main grid lines, a plurality of bonding pads arranged along the main grid lines at intervals and a plurality of first antennas arranged along the main grid lines at intervals, and the bonding pads and the first antennas are located between two harpoon-shaped structures; the second printing pattern comprises a plurality of auxiliary grid lines, a plurality of second antennas printed on the first antennas and a frame line, each auxiliary grid line intersects with the main grid lines, and each auxiliary grid line makes contact with the first antennas and the second antennas. According to the utility model, the antenna is printed twice to increase the height and width of the antenna, and the problem of module EL welding grid breakage is solved under the conditions that the efficiency is not lost and the unit consumption of slurry is not increased.

Description

TECHNICAL FIELD

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

[0002] With the increasingly scarce of non-renewable resources, and some non-renewable resources in people's life and industrial production caused various pollution problems, therefore all countries are using various policy or legal means to gradually increase the development and utilization of renewable energy and clean energy, and strive to improve its proportion in the whole energy use. In clean and renewable energy, solar energy is one of the most important energy, and solar cell panel as the most important equipment in solar energy utilization, the quality of each component needs to be strictly controlled to improve the utilization rate of solar energy and prolong the service life of solar cell panel.

[0003] Reducing cost and improving efficiency is an eternal topic for photovoltaic industry to get out of trouble and continuous development, and each photovoltaic cell enterprise is doing cost reduction work, especially reducing the large head of non-silicon cost-silver paste consumption. But with the continuous reduction of the metalization paste consumption of the cell piece, the height and width of the antenna at the main and auxiliary grid overlap are continuously reduced, resulting in the phenomenon that the back of the cell piece is "burned" and welded due to the high temperature effect of welding and the adsorption effect of the welding strip on the silver paste.

[0004] Usually, the back electrode of the cell piece is formed by two times of printing, the first time is to print the fork, pad point and main grid connecting line, and the second time is to print the auxiliary grid line, antenna (gradient) and frame line. By increasing the width or height of the antenna in the second printing through the conventional method, the welding break phenomenon can be improved, but since the antenna and the auxiliary grid are printed together, adjusting the screen parameters for the antenna will also cause the wet weight of the auxiliary grid to increase, and the overall paste printing wet weight will increase significantly. UTILITY MODEL CONTENTS

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

[0006] To achieve the above utility model purposes, a technical scheme adopted by the utility model is as follows: a solar cell piece, at least one side of the cell piece has a grid line pattern, the grid line pattern includes two times of printing on the cell piece:

[0007] The first printed pattern includes a plurality of main grid lines extending along a first direction and arranged at intervals in a second direction perpendicular to the first direction, a fork type structure connected at the end of each main grid line, a plurality of pads arranged at intervals along each main grid line, and a plurality of first antennas arranged at intervals along each main grid line, and the plurality of pads and the plurality of first antennas are located between the two fork type structures; and

[0008] A second printed pattern, comprising a plurality of sub-grid lines extending along the second direction and being arranged at intervals in the first direction, a plurality of second fingers printed on the first fingers, and a frame line, each of the sub-grid lines intersects with the plurality of main grid lines, and each of the sub-grid lines is in contact with the plurality of first fingers and the plurality of second fingers.

[0009] Further, the first fingers extend along the second direction on both sides of the main grid lines, and the first fingers are long strips with equal width.

[0010] Further, the length L1 of the first fingers is 0.6±0.05mm, and the width H1 of the first fingers is 0.06±0.01mm.

[0011] Further, the second fingers comprise a first part with equal width connected to the main grid lines and a second part connected to the other end of the first part, and the width of the second part gradually decreases in the direction away from the first part along the second direction.

[0012] Further, the length L2 of the first part is 0.8±0.05mm, and the width H2 of the first part is 0.04±0.01mm.

[0013] Further, the length L3 of the second part is 0.16±0.02mm, and the maximum width of the second part is 0.04±0.01mm, and the minimum width of the second part is 0.022±0.005mm.

[0014] Further, the height of the first fingers is 2-3um.

[0015] Further, the height of the second fingers is 5-7um.

[0016] Further, the solder pad comprises two end solder pads located at the edges of the grid pattern and a plurality of intermediate solder pads located between the two end solder pads, and the fishhook structure is connected to the end solder pads.

[0017] Further, the fishhook structure comprises a first fishhook line and a second fishhook line, and the first fishhook line and the second fishhook line have a gap therebetween, and the gap gradually decreases as the first fishhook line and the second fishhook line approach the end solder pads.

[0018] Compared with the prior art, the advantages of the utility model include:

[0019] The utility model discrate grid line pattern includes the first printed pattern of printing on the battery piece first and the second printed pattern of printing on the battery piece second, and the first printed pattern and the second printed pattern all include the antenna, and the antenna height and width are increased by printing twice, and the problem of component EL welding broken grid is solved without losing efficiency and without increasing the consumption of slurry. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is the surface schematic view of solar cell piece in an embodiment of the utility model;

[0021] Figure 2 It is Figure 1 The enlarged view of A part in the middle;

[0022] Figure 3 It is the partial surface schematic view of the first printed pattern of the utility model;

[0023] Figure 4 It is the partial surface schematic view of the second printed pattern of the utility model;

[0024] Figure 5 It is the structural schematic view of the antenna of the utility model.

[0025] Wherein: 1, battery piece;2, grid line pattern;21, first printed pattern;211, harpoon type structure;2111, first harpoon line;2112, second harpoon line;212, main grid line;213, solder pad;2131, end solder pad;2132, middle solder pad;214, first antenna;22, second printed pattern;221, auxiliary grid line;222, second antenna;223, frame line;23, battery piece edge line. DETAILED DESCRIPTION

[0026] In order to make the personnel in the technical field better understand the scheme of the application, the technical scheme in the embodiments of the application will be clearly and completely described below in conjunction with the drawings in the embodiments of the application. Obviously, the described embodiments are only a part of the embodiments of the application, not all the embodiments. Based on the embodiments in the application, all other embodiments obtained by the person skilled in the art without creative labor should belong to the scope of protection of the application.

[0027] It should be noted that the embodiments in the application and the features in the embodiments can be combined with each other without conflict. The application will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0028] Reference Figures 1 to 5The present invention provides a solar cell 1, wherein at least one side of the cell 1 has a grid pattern 2, the grid pattern 2 including a first printed pattern 21 and a second printed pattern 22 printed on the cell 1 in two steps, wherein the first printed pattern 21 is printed on the cell 1 first, and then the second printed pattern 22 is printed.

[0029] The first printed pattern 21 includes multiple main grid lines 212 extending along a first direction D1 and spaced apart in a second direction D2 perpendicular to the first direction D1, a harpoon-shaped structure 211 connected to the end of each main grid line 212, multiple pads 213 spaced apart along each main grid line 212, and multiple first tentacles 214 spaced apart along each main grid line 212. The multiple pads 213 and the multiple first tentacles 214 are located between two harpoon-shaped structures 211. The first printed pattern 21 is printed within the edge line 23 of the battery cell 1.

[0030] The second printed pattern 22 includes multiple sub-grid lines 221 extending along the second direction D2 and spaced apart in the first direction D1, multiple second antennas 222 printed on the first antennas 214, and a border line 223. Each sub-grid line 221 intersects with multiple main grid lines 212, and each sub-grid line 221 contacts multiple first antennas 214 and multiple second antennas 222. The second printed pattern 22 is printed within the edge line 23 of the battery cell 1.

[0031] Because the first antenna 214 was printed on the battery cell 1 during the first printing, the wet weight increased. However, the screen parameters for the second printing were adjusted during the second printing, which reduced the wet weight. Ultimately, the total wet weight did not increase after the two printings, and the conversion efficiency was not lost.

[0032] Furthermore, the first antenna 214 extends along the second direction D2 on both sides of the main grid line 212, and the first antenna 214 is an elongated strip of equal width.

[0033] Furthermore, the length L1 of the first antenna 214 is 0.6 ± 0.05 mm, and the width H1 of the first antenna 214 is 0.06 ± 0.01 mm.

[0034] Furthermore, the second antenna 222 includes a first portion 2221 of equal width connected at one end to the main grid line 212 and a second portion 2222 connected at the other end of the first portion 2221. The width of the second portion 2222 gradually decreases in the direction away from the first portion 2221 along the second direction D2.

[0035] Furthermore, the length L2 of the first part 2221 is 0.8 ± 0.05 mm, and the width H2 of the first part 2221 is 0.04 ± 0.01 mm.

[0036] Further, the length L3 of the second portion 2222 is 0.16±0.02mm, the maximum width of the second portion 2222 is 0.04±0.01mm, and the minimum width of the second portion 2222 is 0.022±0.005mm.

[0037] Further, the height of the first antenna 214 is 2-3um.

[0038] Further, the height of the second antenna 222 is 5-7um.

[0039] Since the second antenna 222 is printed on the first antenna 214, the average height of the first antenna 214 and the second antenna 222 after superposition reaches 8um or more, and the width is also increased by about 20um. The height and width of the antenna are both increased, that is, the cross-sectional area of the antenna is obviously increased, and when the solder strip and the battery piece and the paste are co-melted, there is enough silver paste in the cross-sectional direction of the antenna to provide the solder strip with melting or adsorption, and the welding circuit is not broken.

[0040] Further, the pad 213 includes two end pads 2131 located at the edges of the gate line pattern 2 and a plurality of middle pads 2132 located between the two end pads 2131, and the fishhook structure 211 is connected with the end pad 2131.

[0041] Further, the fishhook structure 211 includes a first fishhook line 2111 and a second fishhook line 2112, and the first fishhook line 2111 and the second fishhook line 2112 have a gap therebetween, and the gap gradually decreases as the first fishhook line 2111 and the second fishhook line 2112 approach the end pad 2131.

[0042] The above description of disclosed embodiments enables a person skilled in the art to implement or use the present application. Various modifications to the above-described embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the above-described embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A solar cell, characterized by, At least one side of a battery piece (1) has a grid line pattern (2), the grid line pattern (2) comprises: A first printed pattern (21) comprising a plurality of main grid lines (212) extending along a first direction (D1) and being spaced apart in a second direction (D2) perpendicular to the first direction (D1), a plurality of fish-tail structures (211) connected at the end of each main grid line (212), a plurality of pads (213) spaced apart along each main grid line (212), and a plurality of first antennae (214) spaced apart along each main grid line (212), the plurality of pads (213) and the plurality of first antennae (214) being located between two fish-tail structures (211); and A second printed pattern (22) comprising a plurality of secondary grid lines (221) extending along the second direction (D2) and being spaced apart in the first direction (D1), a plurality of second antennae (222) printed on the first antennae (214), and a frame line (223), each secondary grid line (221) intersects a plurality of main grid lines (212), and each secondary grid line (221) contacts a plurality of first antennae (214) and a plurality of second antennae (222).

2. The solar cell according to claim 1, wherein The first antennae (214) extend along the second direction (D2) on both sides of the main grid line (212), and the first antennae (214) are long strips with equal width.

3. The solar cell according to claim 2, wherein, The length L1 of the first antennae (214) is 0.6±0.05mm, and the width H1 of the first antennae (214) is 0.06±0.01mm.

4. The solar cell of claim 1, wherein, The second antennae (222) comprise a first part (2221) with equal width connected to the main grid line (212) at one end, and a second part (2222) connected to the other end of the first part (2221), the width of the second part (2222) gradually decreases in the direction away from the first part (2221) along the second direction (D2).

5. The solar cell of claim 4, wherein, The length L2 of the first part (2221) is 0.8±0.05mm, and the width H2 of the first part (2221) is 0.04±0.01mm.

6. The solar cell of claim 4, wherein, The length L3 of the second part (2222) is 0.16±0.02mm, and the maximum width of the second part (2222) is 0.04±0.01mm, and the minimum width is 0.022±0.005mm.

7. The solar cell of claim 1, wherein, The height of the first antennae (214) is 2-3um.

8. The solar cell of claim 1, wherein, The height of the second antennae (222) is 5-7um.

9. The solar cell according to any one of claims 1 to 8, wherein, The pads (213) comprise two end pads (2131) located at the edge of the grid line pattern (2), and a plurality of intermediate pads (2132) located between the two end pads (2131), and the fish-tail structures (211) are connected to the end pads (2131).

10. The solar cell of claim 9, wherein, The fish-tail structure (211) comprises a first fish-tail line (2111) and a second fish-tail line (2112) with a gap between the first fish-tail line (2111) and the second fish-tail line (2112), which gradually decreases as the first fish-tail line (2111) and the second fish-tail line (2112) approach the end pad (2131).

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