CN107146822B - Solar cell capable of being connected at will without broken grid - Google Patents
Solar cell capable of being connected at will without broken grid Download PDFInfo
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- CN107146822B CN107146822B CN201710502609.2A CN201710502609A CN107146822B CN 107146822 B CN107146822 B CN 107146822B CN 201710502609 A CN201710502609 A CN 201710502609A CN 107146822 B CN107146822 B CN 107146822B
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 18
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 18
- 239000010703 silicon Substances 0.000 claims abstract description 18
- 238000010248 power generation Methods 0.000 abstract description 12
- 238000003466 welding Methods 0.000 abstract description 10
- 238000001514 detection method Methods 0.000 abstract description 8
- 238000013461 design Methods 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 238000004806 packaging method and process Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 description 5
- 238000007639 printing Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000002503 electroluminescence detection Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/02—Details
- H01L31/0224—Electrodes
- H01L31/022408—Electrodes for devices characterised by at least one potential jump barrier or surface barrier
- H01L31/022425—Electrodes for devices characterised by at least one potential jump barrier or surface barrier for solar cells
- H01L31/022433—Particular geometry of the grid contacts
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
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- Engineering & Computer Science (AREA)
- Electromagnetism (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Photovoltaic Devices (AREA)
- Cell Electrode Carriers And Collectors (AREA)
Abstract
The invention discloses a solar cell which is free of broken grids and can be connected at will, and belongs to the technical field of solar cells. The grid line comprises a fine grid line and a wide grid line, wherein the fine grid line is a honeycomb grid line and is uniformly distributed on the front surface of the silicon wafer; the electrodes are arranged at the edge of the silicon wafer and consist of polygonal electrodes and wide grid lines, and the wide grid lines are connected with the outer corners of the polygonal electrodes and distributed radially. The invention has simple structure, reasonable design and attractive appearance, avoids the influence caused by broken grids, reduces the shielding area of the battery, improves the battery efficiency, improves the aesthetic degree of products, simultaneously facilitates the welding and packaging of the battery, reduces the bus-strap, increases the power generation efficiency of the photovoltaic module in unit area, and reduces the manufacturing cost and the detection cost.
Description
Technical Field
The invention relates to the technical field of solar cells.
Background
The solar cell needs sunlight irradiation for power generation, and the larger the surface irradiation area is, the higher the power generation efficiency is. However, in order to extract the generated charges, the electrodes are required to collect the charges, and the electrodes are metal and shield the sunlight, so that the area of the electrodes is required to be as small as possible, and the charges can be uniformly collected and extracted.
At present, the solar cell produced at home and abroad is characterized in that: 1) The solar cell electrodes are one or more main grid lines and a plurality of auxiliary grid lines, wherein the plurality of thin grid lines are parallel straight lines, and the main grid lines and the thin grid lines are mutually perpendicular; because the solar cell is provided with parallel straight wire grid lines, the surface electrode inevitably has the phenomenon of grid breakage or false printing of a printing circuit in the printing and sintering process; the phenomenon can lead the whole thin grid line not to form an effective loop, seriously affect the collection of current and lead the internal consumption of the battery to be increased; 2) The width of the main grid electrode of the solar cell is wider and is 20-40 times that of a thin grid line, for example, the widths of the main grid lines of the two-grid, three-grid and four-grid line cells are 2mm, 1.5mm and 1mm, so that the total occupied area is larger and the power generation efficiency is influenced; meanwhile, a large amount of silver paste is needed for the wide main grid and the linear auxiliary grid, so that the cost is high; 3) The battery main grid line penetrates through the surface of the battery in one direction and spans the middle of the battery, when the battery in the photovoltaic module is welded, the battery string can be formed only by welding in one direction, and after the battery string is formed, the battery string can be connected only through the bus strap, so that a large number of bus straps are needed when the battery strings are connected, the area of the module is increased, the cost is increased, the utilization rate of the area of the module is reduced, and the power of the unit area of the photovoltaic module is reduced; 4) Monitoring broken grids, testing the battery by adopting an EL tester, and selecting the broken grids as second grade products or scrapping after finding out the broken grids, so that the qualification rate of the finished product of the battery is affected; in order to avoid leaving the factory of the battery with broken grids, EL detection is also required to be carried out on the battery, so that the detection cost is greatly increased; 5) In addition, the surface of the solar cell also needs a certain aesthetic appearance.
In view of the above, there is a need for a novel solar cell that can be arbitrarily connected without breaking the gate, and that has low production cost.
Disclosure of Invention
The invention aims to solve the technical problems of the prior art, and provides the solar cell which is free of broken grids and capable of being connected at will, and the solar cell has the advantages of simple structure, reasonable design, attractive appearance, capability of avoiding the influence caused by broken grids, reducing the shielding area of the cell, improving the efficiency of the cell, improving the aesthetic degree of the product, convenience in welding and packaging the cell, reduction of a bus bar, increase of the power generation efficiency of a photovoltaic module in unit area and reduction of the manufacturing cost and the detection cost.
At present, the solar cell produced at home and abroad has the technical defects that: 1) The pattern of the parallel thin grid lines, for each generating unit point between two parallel grid lines, the extracted current is uneven, and the middle part can only flow out to two sides; the area is not minimal for uniformly distributing the collected charge; 2) If the grid breakage phenomenon occurs at one or more parallel thin grid lines, current cannot be led out at the parallel thin grid lines, so that local heating is caused, and the power generation efficiency of the battery is affected; 3) The width of the main gate electrode of the solar cell is wider, the total occupied area is larger, and the power generation efficiency is affected; meanwhile, a large amount of silver paste is needed for the wide main grid and the linear auxiliary grid, so that the cost is high; 4) The electrode on the surface of the battery spans the middle of the battery, and only one direction can be provided when the battery is welded, so that a large number of bus bars are needed when the battery strings are connected, the cost is increased, and the power of the photovoltaic module in unit area is reduced.
In the known prior art, some fine grid lines are provided with break points, and the break points are connected through loop lines; the length of a single thin grid line is shortened by half, so that the influence degree of the grid breakage phenomenon is reduced, but the grid breakage phenomenon cannot be avoided fundamentally; meanwhile, another problem is added, namely the battery is manually divided into a plurality of parts by a breakpoint, the requirements on the application welding technology are greatly increased, each main grid is required to be well welded, otherwise, the battery current with a plurality of parts of areas cannot be led out, and the welding difficulty and the detection cost are increased; and the grid line width is wider than that of the conventional thin grid line at present, and meanwhile, the main grid line or two or three parallel lines penetrate through the surface of the battery, so that the total area of the grid line is not greatly changed, the cost of slurry is reduced less, and the problem that the welding can only be carried out in the same direction cannot be solved.
In a word, the current technology of parallel thin grid lines and mutually perpendicular main grid lines has larger shielding on the surface of the battery, has higher printing requirement, cannot avoid grid breakage phenomenon, and affects the power generation efficiency of the battery; meanwhile, the battery has certain limitation on application, has higher welding requirements and can be limited in one direction only.
In order to solve the technical problems, the invention adopts the following technical scheme: the solar cell comprises grid lines and electrodes, wherein the grid lines comprise fine grid lines and wide grid lines, and the fine grid lines are honeycomb grid lines and are uniformly distributed on the front surface of a silicon wafer; the electrodes are arranged at the edge of the silicon wafer and consist of polygonal electrodes and wide grid lines, and the wide grid lines are connected with the outer corners of the polygonal electrodes and distributed radially.
Preferably, the electrode is composed of a quadrilateral electrode and four wide grid lines, wherein the wide grid lines are connected with four outer corners of the quadrilateral electrode and are distributed radially towards the inside of the silicon wafer.
Preferably, the electrode is composed of a pentagonal electrode and three or five wide grid lines, wherein the wide grid lines are connected with three external corners or five external corners of the pentagonal electrode and are radially distributed towards the inside of the silicon wafer.
Preferably, the electrode is arranged on each side of the silicon wafer.
Preferably, the honeycomb network grid lines are hexagonal with the fine grid lines connected with each other, and each connection point is intersected by three fine grid lines in the 120-degree angle direction.
Preferably, the hexagonal side length is not more than 3mm.
Preferably, the thin gate line has a width of 20 μm to 50 μm.
Preferably, the width of the wide gate line is 100 μm to 200 μm.
Preferably, the electrode may be one or a combination of two or more of a quadrangular electrode, a pentagonal electrode, or a hexagonal electrode.
The beneficial effects of adopting above-mentioned technical scheme to produce lie in: the invention has simple structure, reasonable design and attractive appearance, avoids the influence caused by broken grids, reduces the shielding area of the electrode, improves the battery efficiency, improves the attractiveness of the product, simultaneously facilitates the welding and packaging of the battery, reduces the bus-strap, uniformly collects current, avoids the occurrence of long grid lines, increases the power generation efficiency of the unit area of the photovoltaic module, and reduces the manufacturing cost and the detection cost.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic view of the structure of a quadrilateral electrode of the present invention;
FIG. 3 is a schematic view of the structure of the pentagonal electrode of the present invention;
in the figure: 1. a thin gate line; 2. a wide gate line; 3. a silicon wafer; 4. quadrilateral electrodes; 5. pentagonal electrodes.
Detailed Description
The present invention will now be described in further detail with reference to the drawings and detailed description, wherein it is to be understood that the examples described below are merely some, but not all embodiments of the invention. Based on the embodiments of the present invention, any modification, equivalent replacement, improvement, etc. made by those skilled in the art on the basis of the technical scheme of the present invention should be included in the scope of the present invention without making any creative effort, and all such modifications, equivalent replacement, improvement, etc. are included in the scope of the present invention.
Example 1
The solar cell comprises grid lines and electrodes, wherein the grid lines comprise thin grid lines 1 and wide grid lines 2, the width of the thin grid lines 1 is 20 mu m, the width of the wide grid lines 2 is 100 mu m, the thin grid lines 1 are honeycomb grid lines and are uniformly distributed on the front surface of a silicon wafer, the thin grid lines 1 are connected with each other in a hexagonal shape, each connecting point is intersected by three thin grid lines 1 in the 120-degree angle direction, a 156mm multiplied by 156mm cell is taken as an example, the side length of the hexagonal shape is 3mm, and the length interval between two opposite sides is 5.18mm; the electrodes are arranged at the edge of the silicon wafer 3 and consist of polygonal electrodes and wide grid lines 2, and the wide grid lines 2 are connected with the outer corners of the polygonal electrodes and are radially arranged; the electrodes on two opposite sides of the silicon wafer are respectively composed of four quadrilateral electrodes 4 and four wide grid lines 2, wherein the wide grid lines are connected with four corners of the quadrilateral electrodes and are distributed radially towards the inside of the silicon wafer 3; the other two corresponding edge electrodes are respectively composed of four pentagonal electrodes 5 and 3 wide grid lines 2, and the wide grid lines 2 are connected with three outer corners of the pentagonal electrodes and are distributed radially towards the inside of the silicon wafer 3.
The technical scheme of the invention adopts honeycomb network and palm electrode scheme, namely a method of collecting current by a single-point three-direction and six-side net-shaped structure and welding single-point edges, and uniformly collecting the current, thereby reducing the shielding area of the electrode and avoiding the occurrence of long grid lines; the honeycomb network grid lines, namely the fine grid lines 1 are connected with each other in a hexagonal shape, each connecting point is intersected by three grid lines in the 120-degree angle direction, the side length of each hexagon is 3mm, the length interval between the two opposite sides is 5.18mm, and the width of each grid line is 20 mu m; the beneficial effects of the invention are as follows:
in the aspect of current collection effect, the electrode structure of the patent is superior to the existing traditional structure, and the effect is improved by 3 times; the number of the conventional parallel fine grid lines is 80 to 100, the distance between two adjacent center points and the fine grid line is 0.78mm according to 100 calculation, the power-on current can only flow out to the nearest positions of the grid lines on two sides, the hexagonal center points in the honeycomb network grid lines can flow out to six directions around, according to the parallel characteristic of the current, under the condition of the same collecting current effect, the distance between the opposite sides of the hexagonal can be 3 times of parallel lines, compared with the effect of the conventional 100 parallel fine grid lines 1, the hexagonal shape in the honeycomb grid line network can be reduced to about 30, the embodiment is 30 multiplied by 34, thus each fine grid line 1 has only 3mm, and meanwhile, the collecting effect of each node is increased by 3 lines.
In terms of preventing gate breakage, the electrode structure of the technical scheme has no gate breakage phenomenon; according to the technical scheme, the electrode structure has the advantages that each thin grid line 1 is only 3mm, each node is provided with 3 lines, and particularly each line is connected with each other, so that the phenomenon that the current collection of a battery is influenced by grid breakage due to the fact that the traditional longer parallel lines exist at present is avoided, and grid breakage is avoided completely.
The electrode structure of the technical scheme reduces the original 50% on the shielding area, and can improve the generating capacity of the battery by more than 2%; according to the thin grid line 50 μm, the current traditional battery with 2mm two grid lines is taken as an example, and the structural shielding area is 1400 mm 2 Wherein the main gate line area 620 mm 2 Thin gate line area 780 mm 2 5.8% of the total area; the structural shielding area of the technical proposal is 620 mm 2 Wherein the area of the network gate line is 460 mm 2 Electrode area 160 mm 2 This is 2.5% of the total area, and thus the power generation amount can be increased by 3.3%.
In terms of current transmission, the battery of the technical scheme is superior to the traditional battery at present; taking 156mm multiplied by 156mm batteries as an example, the maximum current of power generation is generally about 8A, and the current distribution of the grid lines of the honeycomb network is uniform; the structural design of the wide grid line on the palm electrode greatly increases the bearing capacity of the final collecting point of the weakest link electrode of the battery, and avoids the current non-uniformity caused by the cold joint of a certain main grid line of the traditional battery; in particular, when a break point is set in a thin gate line, a phenomenon that a battery current of a fraction of an area cannot be led out is caused, and when the phenomenon is detected by an EL tester, a phenomenon of one third and one fourth of black occurs.
In the aspect of battery use, the palm electrode is superior to the traditional battery at present, and because the battery electrode is designed at the edge or the periphery of the battery, the electrode can be welded in any direction, and the application of the photovoltaic module is facilitated.
In terms of battery detection, the detection cost can be reduced. The current distribution is uniform, the length of the grid line is 3mm, the grid breakage is completely avoided, and the EL detection can be avoided.
In a word, the invention has simple structure, reasonable design and attractive appearance, avoids the influence caused by broken grids, reduces the shielding area of the electrode, improves the battery efficiency, improves the aesthetic degree of products, simultaneously facilitates the welding and packaging of the battery, reduces the bus-strap, uniformly collects current, avoids the occurrence of long grid lines, increases the power generation efficiency of the unit area of the photovoltaic module, and reduces the manufacturing cost and the detection cost.
The foregoing description of the disclosed embodiments will so enable one skilled in the art to make or use the invention, and many modifications of this embodiment will be readily apparent to those skilled in the art from the description, to devise other arrangements of the products which, although still within the spirit and scope of this invention, are not intended to be limited to the embodiments shown herein but are to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. The solar cell free of broken grid and capable of being connected at will comprises a grid line and an electrode, wherein the grid line comprises a thin grid line (1) and a wide grid line (2), and is characterized in that: the fine grid lines (1) are honeycomb grid lines and are uniformly distributed on the front surface of the silicon wafer; the electrodes are arranged at the edge of the silicon wafer (3) and consist of polygonal electrodes and wide grid lines (2), and the wide grid lines (2) are connected with the outer corners of the polygonal electrodes and are distributed radially.
2. The grid-disconnection free solar cell of claim 1, wherein: the electrode is composed of a quadrilateral electrode (4) and four wide grid lines (2), wherein the wide grid lines (2) are connected with four outer corners of the quadrilateral electrode (4) and are distributed radially towards the inside of the silicon wafer (3).
3. The grid-disconnection free solar cell of claim 1, wherein: the electrode is composed of a pentagonal electrode (5) and three or five wide grid lines (2), wherein the wide grid lines (2) are connected with three outer corners or five outer corners of the pentagonal electrode (5) and are distributed radially towards the inside of the silicon wafer (3).
4. The grid-disconnection free solar cell of claim 1, wherein: the electrode is arranged on each side of the silicon wafer (3).
5. The grid-disconnection free solar cell of claim 1, wherein: the honeycomb network grid lines are hexagonal mutually connected with the fine grid lines (1), and each connecting point is intersected by three fine grid lines (1) in the 120-degree angle direction.
6. The grid-disconnection free solar cell of claim 5, wherein: the side length of the hexagon is not more than 3mm.
7. The grid-disconnection free solar cell of claim 1, wherein: the width of the thin grid line (1) is 20-50 mu m.
8. The grid-disconnection free solar cell of claim 1, wherein: the width of the wide grid line (2) is 100-200 mu m.
9. The grid-disconnection free solar cell of claim 1, wherein: the electrodes may be one or a combination of two or more of quadrilateral electrodes (4), pentagonal electrodes (5) or hexagonal electrodes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710502609.2A CN107146822B (en) | 2017-06-27 | 2017-06-27 | Solar cell capable of being connected at will without broken grid |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710502609.2A CN107146822B (en) | 2017-06-27 | 2017-06-27 | Solar cell capable of being connected at will without broken grid |
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| CN107146822A CN107146822A (en) | 2017-09-08 |
| CN107146822B true CN107146822B (en) | 2023-08-15 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108183127A (en) * | 2017-12-27 | 2018-06-19 | 英利能源（中国）有限公司 | Solar monocrystalline silicon slice, processing method and its application |
| CN110518078A (en) * | 2019-09-27 | 2019-11-29 | 扬州乾照光电有限公司 | A kind of solar cell and preparation method thereof with novel grid line structure |
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| CN102130194A (en) * | 2010-12-31 | 2011-07-20 | 常州天合光能有限公司 | High-transmission-rate low-shading-area solar cell |
| CN202633327U (en) * | 2012-07-05 | 2012-12-26 | 宁波尤利卡太阳能科技发展有限公司 | Facade grid line electrode of crystalline silicon solar cell |
| CN203895470U (en) * | 2014-04-23 | 2014-10-22 | 保利协鑫（苏州）新能源运营管理有限公司 | Solar energy cell front side electrode structure |
| CN105552142A (en) * | 2016-02-01 | 2016-05-04 | 江苏辉伦太阳能科技有限公司 | Novel micro-scattering structure and photovoltaic assembly employing same |
| CN206163498U (en) * | 2016-10-17 | 2017-05-10 | 阿特斯阳光电力集团有限公司 | Solar cell and solar cell module |
| CN206976360U (en) * | 2017-06-27 | 2018-02-06 | 英利能源（中国）有限公司 | The solar cell that a kind of disconnected grid of nothing can be connected arbitrarily |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8895192B2 (en) * | 2008-12-22 | 2014-11-25 | Shin-Kobe Electric Machinery Co., Ltd. | Grid plate for lead acid storage battery, plate, and lead acid storage battery provided with same plate |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102130194A (en) * | 2010-12-31 | 2011-07-20 | 常州天合光能有限公司 | High-transmission-rate low-shading-area solar cell |
| CN202633327U (en) * | 2012-07-05 | 2012-12-26 | 宁波尤利卡太阳能科技发展有限公司 | Facade grid line electrode of crystalline silicon solar cell |
| CN203895470U (en) * | 2014-04-23 | 2014-10-22 | 保利协鑫（苏州）新能源运营管理有限公司 | Solar energy cell front side electrode structure |
| CN105552142A (en) * | 2016-02-01 | 2016-05-04 | 江苏辉伦太阳能科技有限公司 | Novel micro-scattering structure and photovoltaic assembly employing same |
| CN206163498U (en) * | 2016-10-17 | 2017-05-10 | 阿特斯阳光电力集团有限公司 | Solar cell and solar cell module |
| CN206976360U (en) * | 2017-06-27 | 2018-02-06 | 英利能源（中国）有限公司 | The solar cell that a kind of disconnected grid of nothing can be connected arbitrarily |
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