CN215680700U - Photovoltaic laminated small sheet and laminated cell sheet - Google Patents
Photovoltaic laminated small sheet and laminated cell sheet Download PDFInfo
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- CN215680700U CN215680700U CN202121178442.7U CN202121178442U CN215680700U CN 215680700 U CN215680700 U CN 215680700U CN 202121178442 U CN202121178442 U CN 202121178442U CN 215680700 U CN215680700 U CN 215680700U
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- electrode
- photovoltaic
- aluminum
- silver electrode
- laminated
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 75
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 75
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims abstract description 72
- 229910052709 silver Inorganic materials 0.000 claims abstract description 72
- 239000004332 silver Substances 0.000 claims abstract description 72
- 230000005684 electric field Effects 0.000 claims abstract description 38
- 238000009792 diffusion process Methods 0.000 claims abstract description 27
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 18
- 239000010703 silicon Substances 0.000 claims abstract description 18
- 239000011159 matrix material Substances 0.000 claims abstract description 9
- 239000000758 substrate Substances 0.000 claims abstract description 4
- 238000005245 sintering Methods 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000005540 biological transmission Effects 0.000 abstract description 2
- XUIMIQQOPSSXEZ-NJFSPNSNSA-N silicon-30 atom Chemical compound [30Si] XUIMIQQOPSSXEZ-NJFSPNSNSA-N 0.000 description 15
- 238000000034 method Methods 0.000 description 10
- 238000005516 engineering process Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000013082 photovoltaic technology Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000007650 screen-printing Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- -1 silver-aluminum Chemical compound 0.000 description 1
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Abstract
The utility model discloses a photovoltaic laminated tile small piece which sequentially comprises a front electrode, a doped diffusion layer, matrix silicon and a back electrode from the front to the back; the front electrode is electrically connected with the doped diffusion layer; the diffusion doping layer and the substrate silicon form a PN junction; the back electrode is electrically connected with the base silicon; the back electrode comprises an aluminum back electric field and a silver electrode; an extension gap is arranged between the silver electrode and the aluminum back electric field; the silver electrode includes an extension protrusion that spans the extension gap to electrically connect the silver electrode to the aluminum back field. According to the photovoltaic laminated tile small back electrode, the extension gap is arranged between the silver electrode and the aluminum back electric field, a space is reserved for expansion of aluminum paste during sintering, the lapping width of the photovoltaic laminated tile small back electrode can be effectively guaranteed, and excellent current transmission is guaranteed. The utility model also provides a laminated cell with the beneficial effects.
Description
Technical Field
The utility model relates to the field of photovoltaic power generation, in particular to a photovoltaic laminated small piece and a laminated cell piece.
Background
With the development of photovoltaic technology, in order to further improve the utilization rate of solar energy, in addition to the consideration of improving the photoelectric conversion rate of the cell, how to arrange the cells is further considered, so that the illumination area is maximized, a tiled cell technology is introduced, the tiled cell technology designs the grid lines of the cells into patterns which can be reasonably cut into small pieces, the cells are cut into independent small cell units (namely photovoltaic tiled small pieces) by utilizing a slicing technology, the positive and negative electrodes of each small cell unit are connected into strings through conductive adhesive, the traditional structure of connecting a welding strip in series with a cell is abandoned, gaps in the assembly are fully utilized, more than 13% of the cells of the conventional assembly can be placed in the same area, and the non-welding strip design is adopted, so that the line loss of the assembly is greatly reduced, and the output power of the assembly is greatly improved.
The back structure of the laminated cell is formed by screen printing, the back structure is formed by combining silver and aluminum and printing a silver electrode and an aluminum back electric field twice, but due to the ductility difference of the silver paste and the aluminum paste, the joint of the silver electrode and the aluminum back electric field is printed and sintered to form partial aluminum paste to cover the silver electrode, so that the actual width of the silver electrode on the back of the laminated cell is smaller than the designed width, the lap joint difficulty of the laminated small piece is improved, sufficient positive and negative pole overlapping width is ensured to solve the problem, the design width of the back silver electrode is mostly increased in the current solution, and the production cost of the cell is obviously increased.
Therefore, how to reduce the production cost while ensuring the sufficient overlapping width of the positive electrode and the negative electrode of the photovoltaic shingle small piece is a problem to be solved by those skilled in the art.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a photovoltaic laminated small piece and a laminated cell piece, and aims to solve the problem that the overlapping width of the photovoltaic laminated small piece cannot be guaranteed at low cost in the prior art.
In order to solve the technical problem, the utility model provides a photovoltaic laminated tile small piece which sequentially comprises a front electrode, a doped diffusion layer, matrix silicon and a back electrode from the front to the back;
the front electrode is electrically connected with the doped diffusion layer;
the diffusion doping layer and the substrate silicon form a PN junction;
the back electrode is electrically connected with the base silicon;
the back electrode comprises an aluminum back electric field and a silver electrode;
an extension gap is arranged between the silver electrode and the aluminum back electric field;
the silver electrode includes an extension protrusion that spans the extension gap to electrically connect the silver electrode to the aluminum back field.
Optionally, in the photovoltaic tile stack small pieces, if the photovoltaic tile stack small pieces are double-sided battery pieces, the aluminum back electric field includes an aluminum main grid;
the aluminum main grid is positioned at the edge of the aluminum back electric field close to the silver electrode and is parallel to the silver electrode;
the extension protrusion is in contact connection with the aluminum main grid.
Optionally, in the photovoltaic shingle tab, the width of the extended gap ranges from 50 mm to 100 mm, inclusive.
Optionally, in the photovoltaic shingle tab, the length of the extended protrusion ranges from 300 microns to 500 microns, inclusive.
Optionally, in the photovoltaic shingle tab, the width of the extended protrusion ranges from 300 microns to 500 microns, inclusive.
Optionally, in the photovoltaic shingle tab, the pitch between adjacent ones of the extended protrusions ranges from 300 microns to 500 microns, inclusive.
Optionally, in the photovoltaic shingle tab, the extended protrusions are metallic silver protrusions.
Optionally, in the photovoltaic shingle tab, the extended protrusions are at least one of triangular protrusions, rectangular protrusions, or diamond-shaped protrusions.
A tiled cell comprising a plurality of tiled regions cut to yield a photovoltaic tiled die of any of the above.
Optionally, in the laminated cell, the laminated cell further includes a silicon-exposed region;
the silicon-exposed region is used for separating the adjacent shingle regions.
The photovoltaic tile-stacked small chip provided by the utility model sequentially comprises a front electrode, a doped diffusion layer, matrix silicon and a back electrode from the front to the back; the front electrode is electrically connected with the doped diffusion layer; the diffusion doping layer and the substrate silicon form a PN junction; the back electrode is electrically connected with the base silicon; the back electrode comprises an aluminum back electric field and a silver electrode; an extension gap is arranged between the silver electrode and the aluminum back electric field; the silver electrode includes an extension protrusion that spans the extension gap to electrically connect the silver electrode to the aluminum back field.
In addition, the utility model also arranges extension bulges on the silver electrode, so that the silver electrode is fully combined with the aluminum back electric field to form silver-aluminum alloy, thereby ensuring excellent current transmission. The utility model also provides a laminated cell with the beneficial effects.
Drawings
In order to more clearly illustrate the embodiments or technical solutions of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
Fig. 1 to 3 are schematic structural views of an embodiment of a photovoltaic shingle tab provided by the present invention;
FIG. 4 is a schematic structural view of another embodiment of a photovoltaic shingle tab provided in accordance with the present invention;
fig. 5 and fig. 6 are schematic structural views of an embodiment of a laminated cell provided in the present invention.
Detailed Description
In order that those skilled in the art will better understand the disclosure, the utility model will be described in further detail with reference to the accompanying drawings and specific embodiments. It is to be understood that the described embodiments are merely exemplary of the utility model, and not restrictive of the full scope of the utility model. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The core of the utility model is to provide a photovoltaic laminated tile small chip, the structure schematic diagram of one specific embodiment of which is shown in fig. 1 to 3, the photovoltaic laminated tile small chip sequentially comprises a front electrode 10, a doped diffusion layer 20, a matrix silicon 30 and a back electrode from the front to the back;
the front electrode 10 is electrically connected with the doped diffusion layer 20;
the diffusion doping layer and the base silicon 30 form a PN junction;
the back electrode is electrically connected to the bulk silicon 30;
the back electrode comprises an aluminum back electric field 42 and a silver electrode 41;
an extension gap 31 is arranged between the silver electrode 41 and the aluminum back electric field 42;
the silver electrode 41 includes an extension protrusion 43, and the extension protrusion 43 spans the extension gap 31 to electrically connect the silver electrode 41 and the aluminum back field 42.
Fig. 1 is a short-axis cross-sectional view of the present embodiment, fig. 2 is a schematic view of a back side structure of the solar cell, and fig. 3 is a partial schematic view of the back side of the solar cell after enlargement; it should be noted that fig. 2 only shows the position and connection relationship between the structures, and the dimensional ratio thereof is different from the actual one.
As a specific embodiment, the width of the extension gap 31 ranges from 50 mm to 100 mm, inclusive, such as any of 50.0 mm, 68.9 mm, or 100.0 mm; the length of the extended protrusion 43 ranges from 300 microns to 500 microns, inclusive, such as any of 300.0 microns, 412.3 microns, or 500.0 microns.
Additionally, the width of the extended protrusions 43 ranges from 300 microns to 500 microns, inclusive, such as any of 300.0 microns, 381.2 microns, or 500.0 microns; the spacing between adjacent ones of the extended projections 43 ranges from 300 microns to 500 microns, inclusive, such as any one of 300.0 microns, 456.7 microns, or 500.0 microns. Of course, the above parameters can be adjusted accordingly according to actual conditions.
The extended protrusions 43 are metallic silver protrusions; furthermore, the silver paste of the metallic silver protrusion is printed simultaneously with the silver electrode 41, ensuring low resistance electrical connection between the aluminum back field 42 and the silver electrode 41. Of course, the electrode material of the battery can be selected according to the actual situation.
It should be noted that the aluminum back electric field 42 refers to a mesh electrode structure formed by arranging linear aluminum electrodes transversely and longitudinally on the back surface of the solar cell.
The photovoltaic tile-folded small piece provided by the utility model sequentially comprises a front electrode 10, a doped diffusion layer 20, matrix silicon 30 and a back electrode from the front to the back; the front electrode 10 is electrically connected with the doped diffusion layer 20; the diffusion doping layer and the base silicon 30 form a PN junction; the back electrode is electrically connected to the bulk silicon 30; the back electrode comprises an aluminum back electric field 42 and a silver electrode 41; an extension gap 31 is arranged between the silver electrode 41 and the aluminum back electric field 42; the silver electrode 41 includes an extension protrusion 43, and the extension protrusion 43 spans the extension gap 31 to electrically connect the silver electrode 41 and the aluminum back field 42. In the utility model, the extension gap 31 is arranged between the silver electrode 41 and the aluminum back electric field 42, in other words, the silver electrode 41 and the aluminum back electric field 42 are arranged in a non-contact way, so that a space is reserved for the expansion during the sintering of the aluminum paste, the silver electrode 41 is prevented from being covered by the extension of the sintering of the aluminum paste, and the lapping width of the back electrode of the photovoltaic laminated tile can be effectively ensured.
On the basis of the first embodiment, the aluminum back electric field 42 is further defined to obtain a second embodiment, a partial schematic view of which is shown in fig. 4, and the photovoltaic tile chip sequentially includes a front electrode 10, a doped diffusion layer 20, a matrix silicon 30 and a back electrode from the front to the back;
the front electrode 10 is electrically connected with the doped diffusion layer 20;
the diffusion doping layer and the base silicon 30 form a PN junction;
the back electrode is electrically connected to the bulk silicon 30;
the back electrode comprises an aluminum back electric field 42 and a silver electrode 41;
an extension gap 31 is arranged between the silver electrode 41 and the aluminum back electric field 42;
the silver electrode 41 comprises an extension protrusion 43, and the extension protrusion 43 spans the extension gap 31 to electrically connect the silver electrode 41 with the aluminum back field 42;
if the photovoltaic laminated tile small piece is a double-sided battery piece, the aluminum back electric field 42 comprises an aluminum main grid 44;
the aluminum main grid 44 is positioned at the edge of the aluminum back electric field 42 close to the silver electrode 41 and is arranged in parallel with the silver electrode 41;
the extension protrusion 43 is in contact with the aluminum main grid 44.
In this embodiment, the aluminum back electric field 42 is provided with the aluminum main grid 44, so that the aluminum back electric field 42 is in contact with the silver electrode 41 through a sufficient contact surface, the contact area between the aluminum back electric field 42 and the silver electrode 41 is further increased, and the working stability of the solar cell is improved.
Further, the width of the aluminum main grid 44 is not less than the width of the silver electrode 41, so as to further ensure the contact between the extension protrusion and the aluminum main grid 44.
On the basis of the second embodiment, the extending protrusion 43 is further limited to obtain a third embodiment, the schematic structural diagram of which is the same as that of the above embodiments, and the photovoltaic tile chip sequentially includes a front electrode 10, a doped diffusion layer 20, a matrix silicon 30 and a back electrode from the front to the back;
the front electrode 10 is electrically connected with the doped diffusion layer 20;
the diffusion doping layer and the base silicon 30 form a PN junction;
the back electrode is electrically connected to the bulk silicon 30;
the back electrode comprises an aluminum back electric field 42 and a silver electrode 41;
an extension gap 31 is arranged between the silver electrode 41 and the aluminum back electric field 42;
the silver electrode 41 comprises an extension protrusion 43, and the extension protrusion 43 spans the extension gap 31 to electrically connect the silver electrode 41 with the aluminum back field 42;
if the photovoltaic laminated tile small piece is a double-sided battery piece, the aluminum back electric field 42 comprises an aluminum main grid 44;
the aluminum main grid 44 is positioned at the edge of the aluminum back electric field 42 close to the silver electrode 41 and is arranged in parallel with the silver electrode 41;
the extension protrusion 43 is in contact connection with the aluminum main grid 44;
the extension protrusion 43 is at least one of a triangular protrusion, a rectangular protrusion or a diamond-shaped protrusion.
In this embodiment, the extension protrusions 43 may be defined as triangular protrusions, which are easy to process and can ensure effective electrical connection between the silver electrode 41 and the aluminum back field 42. Of course, the shape of the extended protrusion 43 can be selected according to the actual situation, such as a diamond-shaped protrusion or a rectangular protrusion.
The utility model also provides a laminated cell, which is shown in fig. 5 and 6, wherein the structure of the specific embodiment in odds with the situation is schematically shown in fig. 5 and 6, the laminated cell comprises a plurality of laminated areas 100, and the laminated areas 100 are cut to obtain any one of the photovoltaic laminated small pieces. The photovoltaic tile-folded small piece provided by the utility model sequentially comprises a front electrode 10, a doped diffusion layer 20, matrix silicon 30 and a back electrode from the front to the back; the front electrode 10 is electrically connected with the doped diffusion layer 20; the diffusion doping layer and the base silicon 30 form a PN junction; the back electrode is electrically connected to the bulk silicon 30; the back electrode comprises an aluminum back electric field 42 and a silver electrode 41; an extension gap 31 is arranged between the silver electrode 41 and the aluminum back electric field 42; the silver electrode 41 includes an extension protrusion 43, and the extension protrusion 43 spans the extension gap 31 to electrically connect the silver electrode 41 and the aluminum back field 42. In the utility model, the extension gap 31 is arranged between the silver electrode 41 and the aluminum back electric field 42, in other words, the silver electrode 41 and the aluminum back electric field 42 are arranged in a non-contact way, so that a space is reserved for the expansion during the sintering of the aluminum paste, the silver electrode 41 is prevented from being covered by the extension of the sintering of the aluminum paste, and the lapping width of the back electrode of the photovoltaic laminated tile can be effectively ensured.
Fig. 6 is a partial enlarged view of fig. 5, and fig. 5 is not labeled in the middle because the silicon-exposed region is too narrow.
In a preferred embodiment, the laminated cell further includes a silicon-exposed region 200; the exposed silicon regions 200 are used to separate adjacent shingle regions 100.
The silicon exposure area 200 refers to an area where no silver paste or aluminum paste is arranged, namely no electrode or semiconductor structure is arranged, and the silicon exposure area 200 can be arranged to prevent the back electrode from being damaged by mistake when the tiled cell is cut, so that the structure of the photovoltaic tiled cell is damaged, and the yield of finished products is further improved.
Still further, the width of the exposed silicon regions 200 (i.e., the spacing between adjacent shingle regions 100) may range from 300 microns to 500 microns, inclusive, such as any of 300.0 microns, 485.3 microns, or 500.0 microns. Of course, the adjustment can be carried out according to the actual requirement.
The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same or similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
It is to be noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The photovoltaic laminated small plate and the laminated battery plate provided by the utility model are described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (10)
1. The photovoltaic laminated tile small piece is characterized by comprising a front electrode, a doped diffusion layer, matrix silicon and a back electrode from the front to the back in sequence;
the front electrode is electrically connected with the doped diffusion layer;
the diffusion doping layer and the substrate silicon form a PN junction;
the back electrode is electrically connected with the base silicon;
the back electrode comprises an aluminum back electric field and a silver electrode;
an extension gap is arranged between the silver electrode and the aluminum back electric field;
the silver electrode includes an extension protrusion that spans the extension gap to electrically connect the silver electrode to the aluminum back field.
2. The photovoltaic tile die of claim 1, wherein if the photovoltaic tile die is a bifacial cell, the aluminum back field comprises an aluminum primary grid;
the aluminum main grid is positioned at the edge of the aluminum back electric field close to the silver electrode and is parallel to the silver electrode;
the extension protrusion is in contact connection with the aluminum main grid.
3. The photovoltaic shingle tab of claim 1, wherein the width of the extended gap ranges from 50 mm to 100 mm, inclusive.
4. The photovoltaic shingle tab of claim 1, wherein the length of the extended protrusion ranges from 300 microns to 500 microns, inclusive.
5. The photovoltaic shingle tab of claim 1, wherein the width of the extended protrusion ranges from 300 microns to 500 microns, inclusive.
6. The photovoltaic shingle tab of claim 1, wherein the spacing between adjacent ones of the extended protrusions ranges from 300 microns to 500 microns, inclusive.
7. The photovoltaic shingle tab of claim 1 wherein the extended tabs are metallic silver tabs.
8. The photovoltaic shingle tab of claim 1, wherein the extended tabs are at least one of triangular tabs, rectangular tabs, or diamond-shaped tabs.
9. A laminated cell sheet comprising a plurality of laminated areas, wherein the laminated areas are cut to obtain a photovoltaic laminated tile as defined in any one of claims 1 to 8.
10. The laminated cell sheet of claim 9, further comprising an exposed silicon region;
the silicon-exposed region is used for separating the adjacent shingle regions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121178442.7U CN215680700U (en) | 2021-05-28 | 2021-05-28 | Photovoltaic laminated small sheet and laminated cell sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121178442.7U CN215680700U (en) | 2021-05-28 | 2021-05-28 | Photovoltaic laminated small sheet and laminated cell sheet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215680700U true CN215680700U (en) | 2022-01-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121178442.7U Active CN215680700U (en) | 2021-05-28 | 2021-05-28 | Photovoltaic laminated small sheet and laminated cell sheet |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215680700U (en) |
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2021
- 2021-05-28 CN CN202121178442.7U patent/CN215680700U/en active Active
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Effective date of registration: 20220525 Address after: 314400 No. 1 Jisheng Road, Jiaxing City, Zhejiang Province, Jianshan New District, Haining City Patentee after: Zhengtai Xinneng Technology Co.,Ltd. Address before: No.1335 Bin'an Road, Binjiang District, Hangzhou City, Zhejiang Province Patentee before: CHINT SOLAR (ZHEJIANG) Co.,Ltd. |
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Address after: 314400 No. 1 Jisheng Road, Jiaxing City, Zhejiang Province, Jianshan New District, Haining City Patentee after: Zhengtai Xinneng Technology Co.,Ltd. Address before: 314400 No. 1 Jisheng Road, Jiaxing City, Zhejiang Province, Jianshan New District, Haining City Patentee before: Zhengtai Xinneng Technology Co.,Ltd. |
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Effective date of registration: 20240124 Address after: No. 2211 Jianye Road, Yadahong Enterprise Service Center, Ningjiang District, Songyuan City, Jilin Province, 138000 Patentee after: Songyuan Xinneng Photovoltaic Technology Co.,Ltd. Country or region after: China Address before: 314400 No. 1 Jisheng Road, Jiaxing City, Zhejiang Province, Jianshan New District, Haining City Patentee before: Zhengtai Xinneng Technology Co.,Ltd. Country or region before: China |