CN220914247U - Photovoltaic cell front screen pattern - Google Patents
Photovoltaic cell front screen pattern Download PDFInfo
- Publication number
- CN220914247U CN220914247U CN202322663886.5U CN202322663886U CN220914247U CN 220914247 U CN220914247 U CN 220914247U CN 202322663886 U CN202322663886 U CN 202322663886U CN 220914247 U CN220914247 U CN 220914247U
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- Prior art keywords
- printed
- grids
- bonding pads
- battery
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- 229910052709 silver Inorganic materials 0.000 claims abstract description 15
- 239000004332 silver Substances 0.000 claims abstract description 15
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims abstract description 14
- 230000008859 change Effects 0.000 claims abstract description 13
- 239000000463 material Substances 0.000 claims description 7
- 238000007639 printing Methods 0.000 abstract description 33
- 238000003466 welding Methods 0.000 abstract description 12
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 abstract description 4
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 abstract description 4
- 239000007788 liquid Substances 0.000 abstract description 2
- 238000007649 pad printing Methods 0.000 abstract description 2
- 210000004027 cell Anatomy 0.000 description 29
- 229910052581 Si3N4 Inorganic materials 0.000 description 16
- 239000013078 crystal Substances 0.000 description 16
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 16
- 101001073212 Arabidopsis thaliana Peroxidase 33 Proteins 0.000 description 8
- 101001123325 Homo sapiens Peroxisome proliferator-activated receptor gamma coactivator 1-beta Proteins 0.000 description 8
- 102100028961 Peroxisome proliferator-activated receptor gamma coactivator 1-beta Human genes 0.000 description 8
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 8
- 229910052751 metal Inorganic materials 0.000 description 8
- 239000002184 metal Substances 0.000 description 8
- 229910052710 silicon Inorganic materials 0.000 description 8
- 239000010703 silicon Substances 0.000 description 8
- 210000005056 cell body Anatomy 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 238000009826 distribution Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000007650 screen-printing Methods 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 229910021419 crystalline silicon Inorganic materials 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
Landscapes
- Photovoltaic Devices (AREA)
Abstract
The utility model relates to a front-side screen pattern of a photovoltaic cell, and belongs to the technical field of photovoltaic cell manufacturing. The battery comprises a battery body, a plurality of main grids and a plurality of fine grids, wherein the upper part and the lower part of the battery body are divided into two half-piece battery packs, the main grids are vertically printed on the front surface of each half-piece battery pack, the fine grids are horizontally printed on the front surface of each half-piece battery pack, two first bonding pads and a plurality of second bonding pads are distributed on each main grid, and a plurality of gradual change lines are printed on each main grid; the area of each first bonding pad is larger than that of each second bonding pad. Through increasing the printing area of first pad, can increase the head and tail pad printing area under the circumstances that the silver thick liquid total amount that guarantees to use does not increase, increase local main bars area of contact, add a plurality of gradual change lines again, increase the welding strength between a plurality of half group battery, reduce the head and tail rosin joint, the condition emergence of intermediate position skew rosin joint, improve photovoltaic module's power and yield.
Description
Technical Field
The utility model relates to the technical field of photovoltaic cell manufacturing, in particular to a photovoltaic cell front-side screen pattern.
Background
At present, crystalline silicon photovoltaic cells are continuously pursued for high efficiency and low cost, so that the traditional distribution printing patterns are adopted in the screen printing process of the battery piece, main grid bonding pads are independently printed in the screen printing process, the printing materials of the main grid bonding pads are low-solid-content non-burnt-through silver paste, the welding resistance value is higher, the power of the welded assembly is influenced, the main grid wires are required to be narrowed along with the increase of the number of the main grids to ensure that the consumption of the total silver paste is not increased, and phenomena such as welding offset and the like are easy to occur when the photovoltaic assembly end is welded; after the printed finished battery piece is manufactured into a photovoltaic module through the procedures of series welding, lamination and the like, the situations of head-tail cold joint, middle position offset cold joint and the like are easy to exist, and the power and the yield of the photovoltaic module are affected.
Disclosure of utility model
In order to solve the technical problems, the utility model provides a photovoltaic cell front screen pattern for improving welding strength and preventing cold joint. The technical scheme of the utility model is as follows:
The utility model provides a photovoltaic cell front screen pattern, which comprises a cell body, a plurality of main grids and a plurality of thin grids, wherein the upper part and the lower part of the cell body are divided into two half-piece cell groups, the main grids are vertically printed on the front surface of each half-piece cell group, the thin grids are horizontally printed on the front surface of each half-piece cell group, the main grids are vertically connected with the thin grids, two first bonding pads and a plurality of second bonding pads are distributed on each main grid, the two first bonding pads are respectively printed on the top end and the bottom end of the main grid, and the plurality of second bonding pads are vertically and alternately printed between the two first bonding pads; a plurality of gradient lines are printed on the intervals between the first bonding pad and the second bonding pad on each main grid and between the adjacent two second bonding pads, and the gradient lines are positioned on the main grid; the area of each first bonding pad is larger than that of each second bonding pad.
Optionally, each of the main grids printed on the two half-cell battery packs is located in the same vertical direction.
Optionally, the first pad has a size of 1.2x1.2 mm, the second pad has a size of 0.6x0.8 mm, and the gradation line has a size of 1.2x0.02 mm.
Optionally, the printing materials of the main grids are non-burnt-through silver paste, and the printing materials of the fine grids are burnt-through silver paste.
All the above optional technical solutions can be arbitrarily combined, and the detailed description of the structures after one-to-one combination is omitted.
By means of the scheme, the beneficial effects of the utility model are as follows:
Printing a first bonding pad on the top end and the bottom end of each main grid, printing a plurality of second bonding pads between the two first bonding pads, printing a plurality of gradual change lines between the first bonding pads and the second bonding pads and between the two second bonding pads, welding a plurality of bonding pads on the first bonding pads, the second bonding pads and the gradual change lines which are positioned in the same vertical direction, and connecting with other half-cell battery; through increasing the printing area of first pad, can increase the head and tail pad printing area under the circumstances that the silver thick liquid total amount that guarantees to use does not increase, increase local main bars area of contact, add a plurality of gradual change lines again, can increase the welding strength between a plurality of half group battery, reduce the head and tail rosin joint, the condition emergence of intermediate position skew rosin joint, improve photovoltaic module's power and yield.
The foregoing description is only an overview of the present utility model, and is intended to provide a better understanding of the present utility model, as it is embodied in the following description, with reference to the preferred embodiments of the present utility model and the accompanying drawings.
Drawings
Fig. 1 is a front view of a battery body of the present utility model;
FIG. 2 is a graph showing first pad, second pad and graded wire distribution in the present utility model;
fig. 3 is a front view of a prior art battery body;
FIG. 4 is a prior art first and second bond pad profile;
FIG. 5 is a graph comparing the pull force of the present utility model after printing with the prior art;
Fig. 6 is a graph comparing the power of the finished photovoltaic module printed according to the present utility model with the prior art.
Reference numerals illustrate:
1. A battery body; 2. a first bonding pad; 3. a second bonding pad; 4. a gradual change line.
Detailed Description
The following describes in further detail the embodiments of the present utility model with reference to the drawings and examples. The following examples are illustrative of the utility model and are not intended to limit the scope of the utility model.
As shown in fig. 1 to 4, the front-side screen pattern of a photovoltaic cell provided by the utility model comprises a cell body 1, a plurality of main grids and a plurality of fine grids, wherein the upper part and the lower part of the cell body 1 are divided into two half-piece cell groups, the main grids are vertically printed on the front side of each half-piece cell group, the fine grids are horizontally printed on the front side of each half-piece cell group, the main grids are vertically connected with the fine grids, two first bonding pads 2 and a plurality of second bonding pads 3 are distributed on each main grid, the two first bonding pads 2 are respectively printed on the top end and the bottom end of the main grid, and the plurality of second bonding pads 3 are vertically and alternately printed between the two first bonding pads 2; a plurality of gradual change lines 4 are printed on the intervals between the first bonding pad 2 and the second bonding pad 3 on each main grid and between the adjacent two second bonding pads 3, and the gradual change lines 4 are positioned on the main grid; the area of each of the first pads 2 is larger than the area of each of the second pads 3.
In particular embodiments, during actual welding, the two half-cell battery packs are welded as separate finished cell batteries, so that the areas of the first bonding pads 2 at the top and bottom ends of the main grids of each half-cell battery pack are larger than the areas of the second bonding pads 3.
The top and bottom of each main grid are printed with a first bonding pad 2, a plurality of second bonding pads 3 are printed between the two first bonding pads 2, a plurality of gradual change lines 4 are printed between the first bonding pads 2 and the second bonding pads 3 and between the two second bonding pads 3, and a plurality of bonding straps are used for welding on the first bonding pads 2, the second bonding pads 3 and the gradual change lines 4 which are positioned in the same vertical direction and then are connected with other half-piece battery packs.
Through increasing the printing area of the first bonding pad 2, the printing area of the head and tail bonding pads can be increased under the condition that the total amount of silver paste used is not increased, the contact area of a local main grid is increased, a plurality of gradual change lines 4 are additionally arranged, the welding strength among a plurality of half-piece battery packs can be increased, the occurrence of head and tail cold joint and middle position offset cold joint is reduced, and the power and the yield of the photovoltaic module are improved.
Optionally, each of the main grids printed on the two half-cell battery packs is located in the same vertical direction.
In the specific embodiment, in the actual processing process of the battery body 1, the two half-piece battery packs are processed and printed as a whole, so that the main grids of the two half-piece battery packs are all located in the same vertical direction.
Alternatively, the first pad 2 has a size of 1.2x1.2 mm, the second pad 3 has a size of 0.6x0.8 mm, and the gradation line 4 has a size of 1.2x0.02 mm.
The size of the first bonding pad 2 in the prior art is 1×1.2mm, and compared with the first bonding pad 2 in the prior art, the area of the first bonding pad 2 in the utility model is enlarged, the contact area of the local main grid is increased, and the head-tail welding strength between the photovoltaic cells is increased.
Optionally, the printing materials of the main grids are non-burnt-through silver paste, and the printing materials of the fine grids are burnt-through silver paste.
By utilizing the characteristics of non-burn-through silver paste and burn-through silver paste, the printing area of the head and tail bonding pads is increased, the contact area of a local main grid is increased, the high-silver paste is adopted, the contact resistance is reduced, and the welding resistance of the photovoltaic module is improved.
To demonstrate the feasibility of the utility model, the following control and experimental examples were performed:
Control group: selecting a PERC+SE battery comprising a central crystal silicon wafer, a silicon nitride film layer overlapped on the crystal layer, and a back metal electrode overlapped on the silicon nitride film layer, and printing by adopting a conventional photovoltaic cell front screen pattern;
Experimental group: selecting a PERC+SE battery comprising a central crystal silicon wafer, a silicon nitride film layer overlapped on the crystal layer and a back metal electrode overlapped on the silicon nitride film layer, printing the front screen pattern of the photovoltaic cell by adopting the utility model, and the efficiency after printing is as shown in the following table one:
table one:
As shown in the table I, compared with the finished battery piece printed by the conventional photovoltaic cell front screen pattern, the finished battery piece printed by the photovoltaic cell front screen pattern provided by the utility model has improved performance.
Control group: selecting a PERC+SE battery comprising a central crystal silicon wafer, a silicon nitride film layer overlapped on the crystal layer, and a back metal electrode overlapped on the silicon nitride film layer, and printing by adopting a conventional photovoltaic cell front screen pattern;
Experimental group: selecting a PERC+SE battery comprising a central crystal silicon wafer, a silicon nitride film layer overlapped on the crystal layer and a back metal electrode overlapped on the silicon nitride film layer, and printing the front screen pattern of the photovoltaic cell by adopting the utility model; the wet weight of the finished battery piece after the front-side screen pattern printing of the photovoltaic cell is obviously higher than that of the finished battery piece after the front-side screen pattern printing of the conventional photovoltaic cell.
Control group: selecting a PERC+SE battery comprising a central crystal silicon wafer, a silicon nitride film layer overlapped on the crystal layer, and a back metal electrode overlapped on the silicon nitride film layer, and printing by adopting a conventional photovoltaic cell front screen pattern;
Experimental group: selecting a PERC+SE battery comprising a central crystal silicon wafer, a silicon nitride film layer overlapped on the crystal layer and a back metal electrode overlapped on the silicon nitride film layer, printing the front screen pattern of the photovoltaic cell by adopting the utility model, and drawing the printed screen pattern after printing, wherein the drawing is as shown in figure 5: the tension of the finished battery piece after the front-side screen pattern printing of the photovoltaic battery provided by the utility model is obviously stronger than that of the finished battery piece after the front-side screen pattern printing of the conventional photovoltaic battery is adopted.
Control group: selecting a PERC+SE battery comprising a central crystal silicon wafer, a silicon nitride film layer overlapped on the crystal layer, and a back metal electrode overlapped on the silicon nitride film layer, printing a conventional photovoltaic cell front screen pattern, screening the printed finished battery piece by color, efficiency and open pressure, and selecting the battery piece with the same color, efficiency and open pressure to manufacture a photovoltaic module;
Experimental group: selecting a PERC+SE battery comprising a central crystal silicon wafer, a silicon nitride film layer overlapped on the crystal layer and a back metal electrode overlapped on the silicon nitride film layer, printing the front screen pattern of the photovoltaic cell, screening the printed finished battery piece by color, efficiency and open pressure, selecting the battery piece with the same color, efficiency and open pressure for manufacturing a photovoltaic module, wherein the power pair of the finished photovoltaic module is as shown in figure 6: the power of the finished battery piece manufactured into the photovoltaic module after the front-side screen pattern printing of the photovoltaic cell is obviously higher than the power of the finished battery piece manufactured into the photovoltaic module after the front-side screen pattern printing of the conventional photovoltaic cell.
In summary, compared with a finished battery piece obtained by printing a conventional photovoltaic battery front-side screen pattern, the finished battery piece obtained by printing the photovoltaic battery front-side screen pattern provided by the utility model has the advantages that the battery performance, the tensile force, the wet weight and the photovoltaic module power are all improved, the unit consumption of silver paste is reduced, and the conversion efficiency of the finished battery piece is improved.
The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, and it should be noted that it is possible for those skilled in the art to make several improvements and modifications without departing from the technical principle of the present utility model, and these improvements and modifications should also be regarded as the protection scope of the present utility model.
Claims (4)
1. A photovoltaic cell front side web pattern comprising: the battery comprises a battery body (1), a plurality of main grids and a plurality of fine grids, wherein the upper part and the lower part of the battery body (1) are divided into two half-piece battery packs, the main grids are vertically printed on the front surface of each half-piece battery pack, the fine grids are horizontally printed on the front surface of each half-piece battery pack, the main grids are vertically connected with the fine grids, two first bonding pads (2) and a plurality of second bonding pads (3) are distributed on each main grid, the two first bonding pads (2) are respectively printed on the top end and the bottom end of the main grid, and the second bonding pads (3) are vertically and alternately printed between the two first bonding pads (2);
A plurality of gradual change lines (4) are printed at intervals between the first bonding pad (2) and the second bonding pad (3) on each main grid and intervals between two adjacent second bonding pads (3), and the gradual change lines (4) are positioned on the main grid;
The area of each first bonding pad (2) is larger than the area of each second bonding pad (3).
2. The photovoltaic cell front side web pattern of claim 1 wherein each of said primary grids printed on both of said half-cell stacks is in the same vertical orientation.
3. A photovoltaic cell front-side screen pattern according to claim 1, characterized in that the first pads (2) have a size of 1.2 x 1.2mm, the second pads (3) have a size of 0.6 x 0.8mm, and the grading lines (4) have a size of 1.2 x 0.02mm.
4. The photovoltaic cell front side screen pattern of claim 1, wherein the printed materials of the plurality of main grids are non-burn-through silver paste, and the printed materials of the plurality of fine grids are burn-through silver paste.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322663886.5U CN220914247U (en) | 2023-09-28 | 2023-09-28 | Photovoltaic cell front screen pattern |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322663886.5U CN220914247U (en) | 2023-09-28 | 2023-09-28 | Photovoltaic cell front screen pattern |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220914247U true CN220914247U (en) | 2024-05-07 |
Family
ID=90910949
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322663886.5U Active CN220914247U (en) | 2023-09-28 | 2023-09-28 | Photovoltaic cell front screen pattern |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220914247U (en) |
-
2023
- 2023-09-28 CN CN202322663886.5U patent/CN220914247U/en active Active
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