CN210778619U - Solar cell and photovoltaic module with same - Google Patents
Solar cell and photovoltaic module with same Download PDFInfo
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- CN210778619U CN210778619U CN201922095467.XU CN201922095467U CN210778619U CN 210778619 U CN210778619 U CN 210778619U CN 201922095467 U CN201922095467 U CN 201922095467U CN 210778619 U CN210778619 U CN 210778619U
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- 229910000679 solder Inorganic materials 0.000 claims abstract description 17
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 12
- 239000010703 silicon Substances 0.000 claims abstract description 12
- 238000000034 method Methods 0.000 abstract description 10
- 230000008569 process Effects 0.000 abstract description 10
- 238000007639 printing Methods 0.000 abstract description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000003466 welding Methods 0.000 description 14
- 230000000694 effects Effects 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
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Abstract
The utility model discloses a solar cell, which comprises a silicon wafer and a plurality of electrode main grids which are arranged on the illuminated surface of the silicon wafer at intervals and extend along a first direction, wherein the width of each electrode main grid is gradually reduced in the first direction; based on the utility model provides a solar cell's concrete structure, it can be when effectively reducing printing paste unit consumption in the battery manufacture process, reduces bad contact's probability between solder strip and the electrode main grid in the photovoltaic module assembling process.
Description
Technical Field
The utility model relates to a photovoltaic field of making especially relates to a solar cell and have this solar cell's photovoltaic module.
Background
In the photovoltaic industry at a high-speed development stage, new technologies of solar cells emerge endlessly, the power generation efficiency of the cells is improved continuously, the cost of the cells, components and systems is reduced remarkably, and the photovoltaic ionization is brought closer and closer to the internet due to continuous cost reduction and efficiency improvement. In order to output high voltage and high current, a welding strip is generally welded on a silver main grid printed on the surface of a battery piece, a plurality of battery single pieces are connected in series/parallel to form an assembly, and then photo-generated current generated by the battery piece under illumination is gathered together through the grid line and the welding strip to be output outwards for power generation.
In the prior art, the width of a main grid of a 5-main-grid cell piece is generally 0.5-0.8mm, the width of the whole main grid is uniform, and a welding strip is connected with the whole main grid during welding; accordingly, the main grid width of the multi-main-grid battery is narrow, the printing paste consumption of the multi-main-grid battery can be reduced by more than 30% compared with that of a 5-main-grid battery, and the efficiency of the multi-main-grid battery is higher than that of the 5-main-grid battery, so that the multi-main-grid battery sheet has strong popularization potential in recent years. However, since the multi-main-grid battery plate is connected to the welding strip only by the plurality of bonding pads on the electrode main grid during welding, welding deviation, poor contact between the electrode main grid and the welding strip, and the like are easy to occur.
In view of the above, there is a need to provide an improved solution to the above problems.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving one of the technical problem that prior art exists at least, for realizing the utility model purpose of the aforesaid, the utility model provides a solar cell, its concrete design as follows.
A solar cell comprises a silicon wafer and a plurality of electrode main grids which are arranged on a light receiving surface of the silicon wafer at intervals and extend along a first direction, wherein the width of each electrode main grid is gradually reduced in the first direction.
Furthermore, the solar cell also comprises a plurality of welding pads which are arranged on each electrode main grid at intervals.
Further, every a plurality of pads on the electrode main grid include be located the first end pad of rearmost side, be located the second end pad of foremost side and a plurality of being located in the first direction first end pad with the middle pad between the second end pad, in every on the electrode main grid, first end pad with the area of second end pad all is greater than the area of middle pad.
Further, a width of the first end pad in a second direction is greater than a width of the middle pad in the second direction, the second direction being perpendicular to the first direction.
Furthermore, the first end bonding pad is trapezoidal, and the length of one side of the first end bonding pad far away from the middle bonding pad is greater than the length of one side of the first end bonding pad close to the middle bonding pad.
Furthermore, the side length range of one side of the first end bonding pad, which is far away from the middle bonding pad, is 1.5mm-2.5mm, and the side length range of one side of the first end bonding pad, which is close to the middle bonding pad, is 1-2 mm.
Further, a length of the first end pad in the first direction ranges from 0.5 to 1.5 mm.
Furthermore, the middle bonding pad is trapezoidal, and the length of one side of the middle bonding pad close to the first end bonding pad is greater than the length of one side of the middle bonding pad far away from the first end bonding pad.
Furthermore, the side length range of one side of the middle bonding pad close to the first end bonding pad is 1mm-2mm, and the side length range of one side of the middle bonding pad far away from the first end bonding pad is 0.5-1.5 mm.
Further, the length of the middle bonding pad in the first direction ranges from 0.3 mm to 1.2 mm.
Further, a width of the second end pad in a second direction perpendicular to the first direction ranges from 1.5mm to 2.5 mm.
Further, the length of the second end pad in the first direction ranges from 0.5 mm to 1.5 mm.
Further, in the first direction, the width of the rear end of the electrode main grid ranges from 0.05mm to 0.1mm, and the width of the front end of the electrode main grid ranges from 0.03mm to 0.08 mm.
The utility model also provides a photovoltaic module, this photovoltaic module include a plurality of as above solar cell in order to connect adjacent two solar cell's solder strip.
The utility model has the advantages that: based on the utility model provides a solar cell's concrete structure, it can be when effectively reducing printing paste unit consumption in the battery manufacture process, reduces bad contact's probability between solder strip and the electrode main grid in the photovoltaic module assembling process.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural view of a solar cell according to the present invention;
fig. 2 is a schematic diagram of different embodiments of the solar cell electrode main grid according to the present invention;
fig. 3 is a schematic view of the whole solar cell before slicing.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1, the solar cell according to the present invention includes a silicon wafer 100 and a plurality of electrode main grids 200 disposed on a light receiving surface of the silicon wafer 100 at intervals and extending in a first direction. Wherein, in the first direction, the width of each electrode main gate 200 is gradually reduced.
Since the width dimension of the electrode main gate 200 is small, the trend that the width thereof becomes gradually smaller in the first direction is not particularly shown in the drawing. However, as will be readily understood by those skilled in the art, the fact that the width of each electrode main gate 200 is gradually decreased in the first direction means that the two ends of the electrode main gate 200 have different widths and gradually change as a whole.
In the implementation process of the present invention, as shown in fig. 2, in the first direction, the width D1 of the rear end of the electrode main grid 200 ranges from 0.05mm to 0.1mm, and the width D2 of the front end of the electrode main grid 200 ranges from 0.03mm to 0.08 mm. In one embodiment, the width D1 of the rear end of the electrode main grid 200 is set to 0.07mm, and the width D2 of the front end of the electrode main grid 200 is set to 0.05 mm.
It can be understood that the utility model relates to a solar cell still includes a plurality of relatively the perpendicular vice bars 400 that sets up of electrode main grid 200, a plurality of vice bars 400 form electric connection with electrode main grid 200 for collect the electric current that solar cell during operation produced.
The utility model discloses still provide a photovoltaic module on solar cell's the basis that provides, this photovoltaic module includes a plurality of solar cell with the solder strip (not shown in the picture) of connecting two adjacent solar cell.
In the assembly process of a specific photovoltaic module, a section of the solder ribbon connected to the light receiving surface of the silicon wafer is most likely to have a position offset relative to the electrode main grid 200 at the end position, and for this purpose, the end of the section of the solder ribbon connected to the light receiving surface of the silicon wafer is used for being matched with one end of the electrode main grid 200 with a larger end width. Thus, the end of the electrode main grid 200 with a larger width can better adapt to the position offset of the corresponding solder strip relative to the electrode main grid 200, so that the solder strip and the electrode main grid 200 have good electrical connection. In addition, the other end of the electrode main grid 200 is arranged with a smaller width, so that the unit consumption of printing paste in the manufacturing process of the battery can be effectively reduced.
In the present embodiment, the solar cell is a multi-main-grid cell, and as shown in fig. 1, the light receiving surface of the silicon wafer 100 includes 9 electrode main grids 200. In other embodiments of the present invention, the number of the main electrode grids 200 on the light receiving surface of the silicon wafer 100 is generally greater than 5.
In order to ensure that the solder strips can form reliable electrical connection with the electrode main grids 200 during the assembly of the photovoltaic module, the solar cell in the embodiment further includes a plurality of solder pads 300 disposed on each electrode main grid 200 at intervals. The bonding pads 300 are bonded to the bonding areas of the electrode main grid 200 as bonding tapes.
As further shown in fig. 2, in a specific implementation, the plurality of pads 300 on each electrode main gate 200 includes a first end pad 31 located at the rearmost side in the first direction, a second end pad 32 located at the foremost side, and a plurality of middle pads 33 located between the first end pad 31 and the second end pad 32.
In the present invention, on each electrode main gate 200, the areas of the first end pad 31 and the second end pad 32 are all larger than the area of the middle pad 33. In the assembly process of the photovoltaic module, the welding firmness between the end part of the electrode main grid 200 and the welding strip is the most important, the area of the first end bonding pad 31 and the area of the second end bonding pad 32 are larger than that of the middle bonding pad 33, so that the welding strip can be firmly connected to the solar cell, and the consumption of printing paste of the middle bonding pad 33 can be effectively reduced.
As a preferred embodiment of the present invention, referring to fig. 2, the width of the first end pad 31 in the second direction is larger than the width of the middle pad 33 in the second direction, wherein the second direction is perpendicular to the first direction. In a specific photovoltaic module assembling process, the solder strip at the position corresponding to the first end pad 31 generally has a larger position offset relative to the solder strip at the position corresponding to the middle pad 33, and since the width of the first end pad 31 in the second direction is larger than the width of the middle pad 33 in the second direction, the probability of poor welding caused by the position deviation of the solder strip can be reduced to a certain extent.
Referring to fig. 2(a), in this embodiment, the first end pad 31 has a trapezoidal shape, and the side length d1 of the first end pad 31 away from the intermediate pad 33 is greater than the side length d2 of the first end pad 31 close to the intermediate pad 33. In a specific photovoltaic module assembling process, the solder strip at the position corresponding to the side of the first end pad 31 far from the middle pad 33 generally has a larger position offset than the solder strip at the position corresponding to the side of the first end pad 31 near the middle pad 33, and based on the trapezoidal arrangement structure of the first end pad 31 in the embodiment, the printing paste consumption of the first end pad 31 can be reduced while the probability of poor welding caused by the position deviation of the solder strip is reduced.
In some more specific embodiments of the present invention, the side length d1 of the first end pad 31 away from the middle pad 33 is in the range of 1.5mm-2.5mm, and the side length d2 of the first end pad 31 close to the middle pad 33 is in the range of 1-2 mm. In addition, the length h1 of the first end pad 31 in the first direction ranges from 0.5 to 1.5 mm.
As a preferred embodiment of the present invention, the side length d1 of the first end pad 31 far from the middle pad 33 is set to be 2mm, and the side length d2 of the first end pad 31 near the middle pad 33 is set to be 1.5 mm. The length h1 of the first end pad 31 in the first direction is set to 1 mm.
As further shown in fig. 2(a), in this embodiment, the intermediate pad 32 is also provided in a trapezoidal shape, and the side length d3 of the intermediate pad 32 on the side close to the first end pad 31 is larger than the side length d4 of the intermediate pad 32 on the side away from the first end pad 31. The technical effect of the middle pad 32 being set to be trapezoidal can refer to the technical effect of the first end pad 31 being set to be trapezoidal, and is not described herein in detail.
In some more specific embodiments of the present invention, the length of the side d3 of the middle pad 32 near the first end pad 31 ranges from 1mm to 2mm, and the length of the side d4 of the middle pad 32 far away from the first end pad 31 ranges from 0.5 mm to 1.5 mm. In addition, the length h2 of the middle pad 32 in the first direction is in the range of 0.3-1.2 mm.
As a preferred embodiment of the present invention, the length d3 of the side of the middle pad 32 close to the first end pad 31 is set to 1.5mm, and the length d4 of the side of the middle pad 32 far away from the first end pad 31 is set to 1 mm. In addition, the length h2 of the intermediate pad 32 in the first direction is set to 0.6 mm.
Referring to fig. 2(a), in the present embodiment, the width d5 of the second end pad 32 in the second direction perpendicular to the first direction is in the range of 1.5-2.5 mm. Further, the length h3 of the second end pad 32 in the first direction is in the range of 0.5-1.5 mm.
As a preferred embodiment of the present invention, the second end pad 32 is provided in a rectangular shape, and the width d5 of the second end pad 32 in the second direction perpendicular to the first direction is set to 2 mm. Further, the length h3 of the second end pad 32 in the first direction is set to 1 mm. It is understood that in other embodiments of the present invention, the second end pad 32 may be disposed in a trapezoid or other shape with reference to fig. 2(a) and the first end pad 31.
In other embodiments of the present invention, the first end pad 31 and the middle pad 33 may be rectangular or have other shapes as shown in fig. 2 (b). Referring to fig. 2(b), the width d6 of the first end pad 31 in the second direction perpendicular to the first direction is in the range of 1.5-2.5mm, and the length h4 of the first end pad 31 in the first direction is in the range of 0.5-1.5 mm; the width d7 of the intermediate pad 32 in the second direction perpendicular to the first direction is in the range of 1-2mm, and the length h5 of the intermediate pad 32 in the first direction is in the range of 0.3-1.2 mm.
In addition, referring to fig. 1, in the solar cell of the present embodiment, a branch line 500 connecting the first end pad 31 and the second end pad 32 is further respectively disposed at two ends of each electrode main grid 200, and at each end of the electrode main grid 200, the electrode main grid 200 and the branch lines 500 at two sides thereof form a three-fork shape.
In the specific implementation process of the present invention, the solar cell shown in fig. 1 is generally a half-cell, which can be formed by cutting a whole cell. Referring to fig. 3, a monolithic cell structure is shown, which comprises two solar cells shown in fig. 1, wherein the monolithic cell is formed by printing at one time and can be divided into two independent solar cells along a dividing line O-O'.
It should be understood that although the present description refers to embodiments, not every embodiment contains only a single technical solution, and such description is for clarity only, and those skilled in the art should make the description as a whole, and the technical solutions in the embodiments can also be combined appropriately to form other embodiments understood by those skilled in the art.
The above list of details is only for the practical implementation of the present invention, and they are not intended to limit the scope of the present invention, and all equivalent implementations or modifications that do not depart from the technical spirit of the present invention should be included in the scope of the present invention.
Claims (14)
1. The solar cell comprises a silicon wafer and is characterized by further comprising a plurality of electrode main grids which are arranged on the light receiving surface of the silicon wafer at intervals and extend along a first direction, and the width of each electrode main grid is gradually reduced in the first direction.
2. The solar cell of claim 1, further comprising a plurality of bonding pads disposed on each of the electrode main grids at intervals.
3. The solar cell of claim 2, wherein the plurality of pads on each of the electrode main grids comprises a first end pad located at a rearmost side in the first direction, a second end pad located at a foremost side, and a plurality of middle pads located between the first end pad and the second end pad, and an area of each of the first end pad and the second end pad is larger than an area of each of the middle pads on each of the electrode main grids.
4. The solar cell of claim 3, wherein the first end pad has a width in a second direction that is greater than a width of the middle pad in the second direction, the second direction being perpendicular to the first direction.
5. The solar cell according to claim 3 or 4, wherein the first end pad has a trapezoidal shape, and a side of the first end pad away from the middle pad has a longer length than a side of the first end pad close to the middle pad.
6. The solar cell of claim 5, wherein the first end pad is in a range of 1.5mm to 2.5mm on a side away from the middle pad, and in a range of 1mm to 2mm on a side of the first end pad adjacent to the middle pad.
7. The solar cell of claim 6, wherein the length of the first end pad in the first direction is in a range of 0.5-1.5 mm.
8. The solar cell according to claim 3 or 4, wherein the middle bonding pad has a trapezoid shape, and a side of the middle bonding pad close to the first end bonding pad has a longer length than a side of the middle bonding pad far from the first end bonding pad.
9. The solar cell of claim 8, wherein the side of the intermediate bonding pad adjacent to the first end bonding pad has a side length in a range of 1mm to 2mm, and the side of the intermediate bonding pad away from the first end bonding pad has a side length in a range of 0.5 mm to 1.5 mm.
10. The solar cell of claim 9, wherein the length of the intermediate bonding pad in the first direction is in a range of 0.3-1.2 mm.
11. The solar cell of claim 3 or 4, wherein the second end pad has a width in a range of 1.5-2.5mm in a second direction perpendicular to the first direction.
12. The solar cell of claim 3 or 4, wherein the length of the second end pad in the first direction is in the range of 0.5-1.5 mm.
13. The solar cell according to any one of claims 1 to 4, wherein the width of the rear end of the electrode main grid in the first direction is in a range of 0.05mm to 0.1mm, and the width of the front end of the electrode main grid is in a range of 0.03mm to 0.08 mm.
14. A photovoltaic module comprising a plurality of solar cells according to any of claims 1 to 13 connected to solder ribbons of two adjacent solar cells.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922095467.XU CN210778619U (en) | 2019-11-28 | 2019-11-28 | Solar cell and photovoltaic module with same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922095467.XU CN210778619U (en) | 2019-11-28 | 2019-11-28 | Solar cell and photovoltaic module with same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210778619U true CN210778619U (en) | 2020-06-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922095467.XU Active CN210778619U (en) | 2019-11-28 | 2019-11-28 | Solar cell and photovoltaic module with same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210778619U (en) |
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2019
- 2019-11-28 CN CN201922095467.XU patent/CN210778619U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: No. 199, deer mountain road, Suzhou high tech Zone, Jiangsu Province Patentee after: CSI Cells Co.,Ltd. Patentee after: Atlas sunshine Power Group Co.,Ltd. Address before: No. 199, deer mountain road, Suzhou high tech Zone, Jiangsu Province Patentee before: CSI Cells Co.,Ltd. Patentee before: CSI SOLAR POWER GROUP Co.,Ltd. |
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| CP01 | Change in the name or title of a patent holder |