CN113690329B - Battery piece, photovoltaic module and welding frock - Google Patents
Battery piece, photovoltaic module and welding frock Download PDFInfo
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- CN113690329B CN113690329B CN202110998217.6A CN202110998217A CN113690329B CN 113690329 B CN113690329 B CN 113690329B CN 202110998217 A CN202110998217 A CN 202110998217A CN 113690329 B CN113690329 B CN 113690329B
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- grid lines
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- main grid
- mounting
- battery piece
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- 238000003466 welding Methods 0.000 title claims abstract description 69
- 239000004065 semiconductor Substances 0.000 claims abstract description 10
- 239000000758 substrate Substances 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 abstract description 6
- 238000004806 packaging method and process Methods 0.000 description 10
- 239000011521 glass Substances 0.000 description 7
- 230000005540 biological transmission Effects 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 239000002313 adhesive film Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 229910000679 solder Inorganic materials 0.000 description 3
- 241000251468 Actinopterygii Species 0.000 description 2
- 229910021419 crystalline silicon Inorganic materials 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
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 230000009191 jumping Effects 0.000 description 1
- 230000031700 light absorption Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000013082 photovoltaic technology Methods 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K3/00—Tools, devices, or special appurtenances for soldering, e.g. brazing, or unsoldering, not specially adapted for particular methods
- B23K3/08—Auxiliary devices therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K3/00—Tools, devices, or special appurtenances for soldering, e.g. brazing, or unsoldering, not specially adapted for particular methods
- B23K3/08—Auxiliary devices therefor
- B23K3/087—Soldering or brazing jigs, fixtures or clamping means
-
- 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
-
- 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
-
- 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
- H01L31/04—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 adapted as photovoltaic [PV] conversion devices
- H01L31/042—PV modules or arrays of single PV cells
- H01L31/048—Encapsulation of modules
-
- 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
- H01L31/04—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 adapted as photovoltaic [PV] conversion devices
- H01L31/042—PV modules or arrays of single PV cells
- H01L31/05—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells
- H01L31/0504—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells specially adapted for series or parallel connection of solar cells in a module
-
- 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
- H01L31/18—Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof
-
- 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
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Landscapes
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- General Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Computer Hardware Design (AREA)
- Physics & Mathematics (AREA)
- Power Engineering (AREA)
- Electromagnetism (AREA)
- Sustainable Development (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mechanical Engineering (AREA)
- Sustainable Energy (AREA)
- Manufacturing & Machinery (AREA)
- Battery Mounting, Suspending (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The invention discloses a battery piece, a photovoltaic module and a welding tool, wherein the battery piece comprises a semiconductor substrate and a grid line electrode, the grid line electrode comprises a plurality of main grid lines and a plurality of thin grid lines, the main grid lines are distributed at intervals along a first direction, the thin grid lines are distributed at intervals along a second direction, the grid line electrode at least comprises a first area and a second area, the first area is distributed along the first direction, the distance between two adjacent main grid lines in the first area is larger than the distance between two adjacent main grid lines in the second area, and the distance between two adjacent thin grid lines in the second area is larger than the distance between two adjacent thin grid lines in the first area. Compared with the prior art, the welding fixture is used for welding the corresponding fixture of the large-size battery piece in the assembly welding process, and the welding fixture is not required to be replaced because the main grid line spacing is unchanged when the small-size battery piece is replaced, and only the redundant main grid line welding position is required to be shielded, so that the compatibility of the welding fixture is realized.
Description
Technical Field
The invention relates to the technical field of solar cells, in particular to a cell, a photovoltaic module and a welding tool.
Background
In recent years, photovoltaic technology has been rapidly developed, high-power components are increasingly demanded, corresponding battery piece size components are increased, 158, 163, 166, 182 and 210 and larger battery pieces are arranged in a hundred flowers and are placed down, corresponding large-size component items are taken down, and finished products of photovoltaic power generation are further lowered. The diversification of the cell size is in one-to-one correspondence with the welding tool, so that the tool equipment and the workload in the process of replacing products with different sizes at the assembly end are increased. In the cell designs of different sizes, the main grid spacing is designed to be equal in the cell pattern design, and as the cell size increases and the demand of lower cost is pursued, the number of the main grids of the cell needs to be further increased for better current collection. The equidistant graphic design of battery pieces all need to be changed to weld the frock setting to the battery piece of equidimension in the subassembly welding process, can't realize the compatibility of subassembly frock.
Disclosure of Invention
The invention aims to provide a battery piece, a photovoltaic module and a welding tool, which are used for solving the technical problems in the prior art.
The invention provides a battery piece, which comprises a semiconductor substrate and a grid line electrode arranged on the semiconductor substrate, wherein the grid line electrode comprises a plurality of main grid lines and a plurality of thin grid lines, the main grid lines are distributed at intervals along a first direction, the thin grid lines are distributed at intervals along a second direction, each main grid line is electrically connected with the thin grid lines, the grid line electrode at least comprises a first area and a second area which are distributed along the first direction, the distance between two adjacent main grid lines in the first area is larger than the distance between two adjacent main grid lines in the second area, and the distance between two adjacent thin grid lines in the second area is larger than the distance between two adjacent thin grid lines in the first area.
In the battery sheet described above, it is preferable that the first region and the second region are disposed in sequence, or the first region is located between the two second regions.
A battery sheet as described above, wherein preferably the first region is located directly between the two second regions.
In the above battery sheet, preferably, the first region has a plurality of adjacent main grid lines, and the adjacent main grid lines are spaced apart from each other at equal intervals.
In the battery sheet described above, preferably, a distance between two adjacent main grid lines in the first region is 8.5-13mm.
In the battery sheet, preferably, in the first region, a distance between two adjacent main grid lines is 10-12mm; in the second region, the distance between two adjacent main grid lines is 9-11mm.
In the battery sheet, preferably, the number of the fine grid lines in the first area is 70-75, and the number of the fine grid lines in the second area is 65-70.
In the above battery sheet, it is preferable that the gate line electrode further includes a third region provided on a side of the second region remote from the first region.
In the battery sheet described above, preferably, a pitch between two adjacent main grid lines in the third region is smaller than a pitch between two adjacent main grid lines in the second region, and a pitch between adjacent thin grid lines in the third region is larger than a pitch between adjacent thin grid lines in the second region.
In the above battery cell, it is preferable that the number of thin grid lines existing between the main grid line on the most side and the edge of the battery cell is greater than the number of thin grid lines between two adjacent main grid lines.
The invention also provides a photovoltaic module, which comprises a back plate, packaging glass and the battery pieces, wherein adjacent battery pieces are electrically connected through welding belts, the back plate is arranged below the battery pieces, the packaging glass is arranged above the battery pieces, and packaging adhesive films are filled between the back plate and the battery pieces and between the packaging glass and the battery pieces.
The invention also provides a welding tool which is used for welding two adjacent battery pieces, wherein the battery pieces are the battery pieces, the welding tool comprises an installation seat, a plurality of first pressing needle groups which are arranged at intervals along a first direction are arranged in a first space range of the installation seat, a plurality of second pressing needle groups which are arranged at intervals along the first direction are arranged in a second space range of the installation seat, a plurality of first pressing needle groups are in one-to-one correspondence with a plurality of main grid lines in a first area, the first pressing needle groups comprise a plurality of first pressing needles which are arranged at intervals along the second direction, a plurality of second pressing needle groups are in one-to-one correspondence with a plurality of main grid lines in a second area, and a plurality of second pressing needle groups are arranged along the second direction.
The welding fixture as described above, preferably, the mounting base includes a mounting frame and a plurality of mounting ribs disposed on the mounting frame, the plurality of mounting ribs are disposed at intervals along the second direction, each of the mounting ribs is provided with a plurality of mounting holes along the first direction, the first pressing pin or the second pressing pin is elastically and reciprocally mounted in the mounting holes, and the number of mounting holes on a single mounting rib in the first space range corresponds to the number of main grid lines on the battery piece in the first area; the number of mounting holes on a single mounting rib in the second space range corresponds to the number of main grid lines on the battery piece in the second area.
The welding fixture as described above, preferably, the mounting base includes a mounting frame and a plurality of mounting ribs disposed on the mounting frame, the plurality of mounting ribs are disposed at intervals along a first direction, a plurality of mounting holes are disposed on the mounting ribs at intervals along a second direction, a first pressing pin or a second pressing pin is disposed in each mounting hole in a corresponding manner, and the number of the mounting ribs in the first space range corresponds to the number of main grid lines on the battery piece in the first area; the number of the mounting ribs in the second space range corresponds to the number of the main grid lines on the battery piece in the second area.
The welding tool according to the above aspect, preferably, the first space range and the second space range are sequentially arranged, or the first space range is located between the two second space ranges.
A welding fixture as described above, wherein preferably said first spatial extent is located directly in between said two second spatial extents.
In the welding tool, preferably, the grid line electrode further includes a third space range, and the third space range is disposed on one side of the second space range away from the first space range.
Compared with the prior art, in the design of the battery piece patterns of different sizes, multiple main grid lines and super-multiple main grid lines (SMBB), the main grid line spacing in the design of the battery piece patterns of larger sizes is designed to be non-equidistant based on the design of the main grid line spacing of the battery piece patterns of relatively smaller sizes, the main grid line spacing positions in the middle are in one-to-one correspondence with the main grid line spacing of the corresponding small battery piece patterns, and the redundant main grid lines corresponding to the large sizes are increased at the sides of the corresponding main grid lines according to the design; through this kind of design, use the frock welding that the jumbo size battery piece corresponds in the subassembly welding process, because main grid line interval is unchangeable when changing the jumbo size battery piece, need not change welding frock, only need the unnecessary main grid line welding position of shielding can, realize that welding frock is compatible.
Drawings
FIG. 1 is a schematic view of a battery plate according to the present invention;
FIG. 2 is an enlarged partial schematic view of a battery cell;
FIG. 3 is a schematic structural view of a photovoltaic module;
fig. 4 is a schematic structural view of the welding tool of the present invention.
Reference numerals illustrate:
1-battery piece, 2-main grid line, 3-fine grid line, 4-shunt line, 5-backboard, 6-packaging glass, 7-welding strip, 8-packaging adhesive film, 9-mounting seat, 10-first space range, 11-second space range, 12-first needle pressing group, 13-second needle pressing group, 14-first needle pressing, 15-second needle pressing, 16-mounting frame, 17-mounting rib, 18-bifurcation, 19-blank space;
100-a first region;
200-second region.
Detailed Description
The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
As shown in fig. 1, an embodiment of the present invention provides a battery piece 1, which includes a semiconductor substrate and a grid line electrode disposed on the semiconductor substrate, wherein the semiconductor substrate is made of a silicon wafer material, the grid line electrode is at least disposed on the front surface of the semiconductor substrate, and may also be disposed on the back surface of the semiconductor substrate, the grid line electrode includes a plurality of main grid lines 2 distributed at intervals along a first direction and a plurality of thin grid lines 3 distributed at intervals along a second direction, each main grid line 2 is electrically connected with a plurality of thin grid lines 3, the thin grid lines 3 are used for collecting photo-generated current generated by a solar cell, and the main grid lines 2 are used for collecting current on the thin grid lines 3 and leading the collected current out of the solar cell through a bonding pad on a bonding tape 7.
The grid line electrode at least comprises a first region 100 and a second region 200 distributed along the first direction, the size of the first region 100 can be 161.75 ±5mm, 163.75 ±5mm, 166±5mm, 182±5mm, 188±5mm, 210±5mm, and those skilled in the art can know that the corresponding sizes of the first region 100 and the second region 200 can correspond to the size of a conventional battery plate in the prior art, the interval between two adjacent main grid lines 2 in the first region 100 is larger than the interval between two adjacent main grid lines 2 in the second region 200, and the interval between two adjacent thin grid lines 3 in the second region 200 is larger than the interval between two adjacent thin grid lines 3 in the first region 100.
On the same battery piece 1, the smaller the distance between two adjacent main grid lines 2 is, the closer the path for collecting photo-generated current is, the lower the electrical loss is, the transmission distance of current on a silicon wafer is effectively shortened, the loss is reduced, and the conversion efficiency of the crystalline silicon battery can be greatly improved; after the pitch of the main grid lines 2 is reduced, the number of the thin grid lines 3 can be reduced, and the pitch between two adjacent thin grid lines 3 is larger. The number of the fine grid lines 3 is reduced, the space is increased, the light receiving area of the battery piece 1 body can be increased, and the battery efficiency is improved while the unit consumption is reduced.
In this embodiment, the first area 100 and the second area 200 are sequentially disposed, or the first area 100 is located between two second areas 200. More preferably, the two second areas 200 are symmetrically disposed on both sides of the first area 100, that is, the first area 100 is located at the middle of the two second areas 200. Therefore, the arrangement can be convenient for printing plate making and forming, aiming at the multi-main grid battery piece 1 with different sizes, in the graphic design of the battery piece 1 with the adjacent size, the main grid spacing design of the battery piece 1 with the relatively small size is taken as the basis, the main grid line 2 spacing design in the graphic design of the battery piece 1 with the larger size is designed into unequal spacing, the spacing positions of the main grid lines 2 in the first area 100 are in one-to-one correspondence with the main grid line 2 spacing of the corresponding small-size battery piece 1, and the redundant main grid lines 2 corresponding to the large size (namely the main grid lines 2 of the second area 200) are increased at two sides of the corresponding first area 100 according to the design; the design can solve the problem of tool compatibility in the welding process of the battery pieces 1 with different sizes.
When the distance between the main grid lines 2 is reduced, the number of the main grid lines 2 on the battery piece is more, the shielding on the surface of the battery piece is larger, and the light absorption is influenced. In this embodiment, the spacing between two adjacent main gate lines 2 in the first region 100 is preferably 10-12mm, more preferably 11.87mm, and the spacing between two adjacent main gate lines 2 in the second region 200 is preferably 9-11mm, more preferably 10.87mm. The distance between the two main grid lines 2 is kept to be the above value, which is the optimal value obtained by the comprehensive consideration, on one hand, the distance between the two adjacent main grid lines 2 is small, the transmission distance of current on a silicon wafer can be effectively shortened, the loss is reduced, the conversion efficiency of a crystalline silicon battery can be greatly improved, on the other hand, the increase of the number of the main grid lines and the shielding of the surface of a battery piece caused by the too small distance are avoided as much as possible, and the power generation efficiency is ensured.
Those skilled in the art will appreciate that there may be further areas, such as a third area and a fourth area, for example, a third area is further included, and the third area is disposed on a side of the second area 200 away from the first area 100. The distance between two adjacent main grid lines 2 in the third area is smaller than the distance between two adjacent main grid lines 2 in the second area 200, and the distance between two adjacent thin grid lines 3 in the third area is larger than the distance between two adjacent thin grid lines 3 in the second area 200. Therefore, the application range of the battery piece 1 is wider, and one battery piece 1 with a larger size can adapt to a plurality of battery pieces 1 with small sizes without frequent replacement of welding tools.
Preferably, the number of the thin gate lines 3 in the first area 100 is 70-75, the spacing between the adjacent thin gate lines 3 is 5-5.5um, the number of the thin gate lines 3 in the second area 200 is 65-70, the spacing between the adjacent thin gate lines 3 is 6-6.5um, the number of the thin gate lines 3 in the third area is 60-65, and the spacing between the adjacent thin gate lines 3 is 7-7.5um. With the increase of the distance between the two thin grid lines 3, the light receiving area of the battery piece 1 body can be increased, and the battery efficiency is basically kept unchanged while the unit consumption is reduced.
Further, in the area of the entire battery plate 1, no matter which area is the most edge, the number of the thin grid lines 3 existing between the main grid lines 2 at the most edge and the edge of the battery plate 1 is greater than the number of the thin grid lines 3 between two adjacent main grid lines 2 in the area. The encryption processing of the thin grid lines 3 is performed at the peripheral edge of the battery piece 1 mainly because the first main grid line 2 at the edge of the battery piece 1 needs to avoid the chamfering of the battery piece 1, so that the most edge main grid line 2 is far away from the edge of the battery piece 1, and an EL dark area at the edge of the battery piece 1 appears, therefore, the encryption processing is performed on the thin grid lines 3 at the edge of the battery piece 1 on the basis of multiple main grids, the density of the thin grid lines 3 at the edge of the battery piece 1 is increased, and the current collection capacity is improved.
A plurality of shunt lines 4 distributed at intervals along a third direction are arranged between the two adjacent main grid lines 2, the shunt lines 4 are electrically connected with the two adjacent thin grid lines 3, and the shunt lines 4 are designed on the two adjacent thin grid lines 3, so that under the condition of broken lines, photo-generated current can be equivalently and effectively collected by the main grid lines 2 along the thin grid lines 3, the influence of the broken grid of the battery piece 1 is prevented, and the degradation risk of the component product due to the broken grid of the battery piece 1 is greatly reduced.
Preferably, the shunt lines 4 may be disposed at a middle position between two adjacent main grid lines 2, and a plurality of thin grid lines 3 may be spaced between two shunt lines 4, so as to reduce shielding of the thin grid lines 3, improve working efficiency of the thin grid lines 3, and if two or more broken lines are disposed on the thin grid lines 3, photo-generated current collected by the thin grid lines 3 may flow away on the shunt lines 4 connected with the thin grid lines 3, so that the photo-generated current having two or more broken lines on the thin grid lines 3 still can collect the photo-generated current to form current flowing to the main grid lines 2, so that a part of the state that may possibly fail originally becomes effective, and improve working efficiency of the battery piece 1.
Further, the width of the shunt line 4 is 0.02-0.2mm, preferably the width of the shunt line 4 is 0.022mm, so that the shading area is effectively reduced, the battery efficiency is improved (by 0.05% -0.15%), the attenuation of the battery piece 1 is reduced, and the low EL blackening of the battery is reduced. The absorption rate of the battery piece 1 can be effectively increased, the short-circuit current of the battery piece 1 is improved, and the quality of the battery piece 1 is improved.
Meanwhile, no shunt line 4 exists between the main grid line 2 at the most side and the edge of the battery piece 1, so that the influence of shading is reduced, and the current collection capacity is improved.
In this embodiment, the first direction is perpendicular to the second direction, the second direction is parallel to the third direction, that is, the extending direction of the shunt line 4 is parallel to the extending direction of the main grid line 2, the extending direction of the main grid line 2 is perpendicular to the extending direction of the thin grid line 3, and the extending direction of the main grid line 2 is consistent with the length direction of the battery piece 1, so that when typesetting and connection with the solder strip 7 are performed, the lengths of the solder strip 7 and the main grid line 2 are shortest, thereby achieving the purpose of saving the silver paste consumption and the solder strip 7 consumption of the main grid line 2. Those skilled in the art will appreciate that the first direction, the second direction, and the third direction may be offset or curved, and are not limited herein.
Further, as shown in fig. 2, the main gate line 2 includes a main body section, and a start section and an end section located at two ends of the main body section, where the start section and the end section are both in a harpoon or U-shaped structure. Two ends of each main grid line 2 are respectively provided with a fish fork or U-shaped structure, the fish fork or U-shaped structure is in the shape of two branches 18, a blank area 19 is formed between the two branches 18 and is used for forming a welded buffer area, so that the end part of the welding strip 7 is far away from the edge of the battery piece 1 when the welding strip 7 is welded with the main grid lines 2, and fragments caused by edge stress concentration are avoided. The corresponding main grid line 2 can assist in collecting current after being welded in the blank area 19, and can shorten a current path, and by arranging the branches 18 at two ends of the main grid line 2, the current can be effectively collected, meanwhile, the light receiving area of part is increased, meanwhile, the starting welding point of the main grid line 2 during welding is avoided, the thermal stress is effectively released during welding, and the hidden crack of the starting welding point is reduced. In this embodiment, the distance between the branches 18 in the direction perpendicular to the main grid line 2 may be set to be between 0.4mm and 2mm, and more preferably between 1mm and 2mm, to thereby increase the probability that the main grid line 2 collects current in the end regions, that is, to increase the energy conversion efficiency in the end regions of the main grid line 2.
Based on the above-mentioned battery piece 1, the invention also provides a photovoltaic module, as shown in fig. 3, the photovoltaic module comprises a back plate 5, packaging glass 6 and a battery piece 1, wherein adjacent battery pieces 1 are electrically connected through a welding strip 7, the back plate 5 is arranged below the battery piece 1, the packaging glass 6 is arranged above the battery piece 1, and packaging adhesive films 8 are filled between the back plate 5 and the battery piece 1 and between the packaging glass 6 and the battery piece 1.
The embodiment also provides a welding tool, which comprises a mounting seat 9, wherein the mounting seat 9 can be arranged on a transmission device for transmitting the battery piece 1, the transmission device is preferably a conveyor belt, and the mounting seat 9 is arranged at a preset position of the conveyor belt in a straddling manner.
As shown in fig. 4, the welding fixture includes a mounting seat 9, a first press pin set 12 is disposed in a first space range 10 of the mounting seat 9, a second press pin set 13 is disposed in a second space range 11 of the mounting seat 9, the first space range 10 and the second space range 11 respectively correspond to a first area 100 and a second area 200 on the battery piece 1, a plurality of the first press pin sets 12 are in one-to-one correspondence with a plurality of main grid lines 2 in the first area 100, a plurality of the first press pin sets 12 are in one-to-one correspondence with a plurality of the main grid lines 2 in the first area 100, a distance between adjacent first press pin sets 12 is equal to a distance between a plurality of main grid lines 2 in the first area 100, the first press pin sets 12 include a plurality of first press pins 14 which are disposed at intervals along a second direction, each first press pin 14 is respectively used for contacting with a welding strip 7 in the first area 100, each first press pin 14 and each welding strip 7 disposed on the battery piece 1 along each welding strip 7 in each second direction are disposed in order to prevent the welding strip 7 from being in the first area 1 from being in a close contact with the welding strip 1.
Further, the first spatial range 10 and the second spatial range 11 are sequentially arranged, or the first spatial range 10 is located between the two second spatial ranges 11. More preferably, the first space 10 is located in the middle of the two second space 11, so as to strictly correspond to the first area 100 and the second area 200 on the battery piece 1, and ensure welding accuracy.
Still further, the gate line electrode further includes a third spatial range, where the third spatial range is disposed on a side of the second spatial range 11 away from the first spatial range, and the third spatial range corresponds to a third area, and those skilled in the art can know that the corresponding spatial range can be increased or decreased according to the area setting on the battery plate 1, which is not limited herein.
The second pressing pin groups 13 are in one-to-one correspondence with the main grid lines 2 in the second area 200, the distance between every two adjacent second pressing pin groups 13 is equal to the distance between the main grid lines 2 in the second area 200, each second pressing pin group 13 comprises a plurality of second pressing pins 15 arranged along a second direction, each second pressing pin 15 is respectively used for being in contact with a welding strip 7 in the second area 200, and each welding spot arranged along the second direction on each second pressing pin 15 and the battery piece 1 is arranged in a staggered mode so as to press the welding strip 7 in the second area 200 on the battery piece 1, so that the welding strip 7 is tightly attached to the main grid lines 2 on the battery piece 1 in the second area 200, and the welding strip 7 is prevented from jumping in the welding process of the second area 200.
Further, the mounting base 9 includes a mounting frame 16 and a plurality of mounting ribs 17 disposed on the mounting frame 16, the plurality of mounting ribs 17 are disposed at intervals along the second direction, a plurality of mounting holes are disposed on each mounting rib 17 along the first direction, a first presser pin 14 or a second presser pin 15 is elastically and reciprocally mounted in the mounting holes, the number of mounting holes on a single mounting rib 17 in the first space range 10 corresponds to the number of main grid lines 2 on the battery cells 1 in the first area 100, the interval between adjacent mounting holes on a single mounting rib 17 in the first space range 10 is equal to the interval between the main grid lines 2 on the battery cells 1 in the first area 100, and one first presser pin set 12 is composed of a plurality of first presser pins 14 extending along the second direction on the plurality of mounting ribs 17 in the first space range 10; the number of mounting holes on the single mounting rib 17 in the second space range 11 corresponds to the number of main grid lines 2 on the battery piece 1 in the second area 200, the spacing between adjacent mounting holes on the single mounting rib 17 in the second space range 11 is equal to the spacing between the main grid lines 2 on the battery piece 1 in the second area 200, and one second presser group 13 is composed of a plurality of second pressers 15 extending along the second direction on a plurality of mounting ribs 17 in the second space range 11.
As will be appreciated by those skilled in the art, there may be other embodiments, the mounting base 9 includes a mounting frame 16 and a plurality of mounting ribs 17 disposed on the mounting frame 16, the plurality of mounting ribs 17 are disposed at intervals along a first direction, a plurality of mounting holes are disposed on the mounting ribs 17 at intervals along a second direction, a first presser pin 14 or a second presser pin 15 is disposed in each mounting hole in a corresponding manner and capable of being reciprocally lifted, the number of the mounting ribs 17 in the first space range 10 corresponds to the number of the main grid lines 2 on the battery cells 1 in the first area 100, the interval between adjacent mounting ribs 17 in the first space range 10 is the same as the interval between the main grid lines 2 on the battery cells 1 in the first area 100, and one first presser pin set 12 is composed of a plurality of first presser pins 14 on one mounting rib 17 in the first space range 10; the number of the mounting ribs 17 in the second space range 11 corresponds to the number of the main grid lines 2 on the battery cells 1 in the second area 200, the spacing between the adjacent mounting ribs 17 in the second space range 11 is the same as the spacing between the main grid lines 2 on the battery cells 1 in the second area 200, and one second presser group 13 is composed of a plurality of second presser pins 15 on one mounting rib 17 in the second space range 11.
The spacing between adjacent mounting holes of the mounting ribs 17 in the first space region 10 is equal to the spacing between adjacent main grid lines in the first region 100, and preferably, the spacing between adjacent mounting holes of the mounting ribs 17 in the first space region 10 is 10-12mm. The spacing between adjacent mounting holes of the mounting ribs 17 in the second spatial range 11 is equal to the spacing between adjacent main grid lines in the second region 200, and preferably, the spacing between adjacent mounting holes of the mounting ribs 17 in the second spatial range 11 is 9-11mm.
While the foregoing is directed to embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.
Claims (15)
1. The utility model provides a welding frock, its characterized in that is used for welding two adjacent battery pieces, wherein:
the battery piece comprises a semiconductor substrate and a grid line electrode arranged on the semiconductor substrate, wherein the grid line electrode comprises a plurality of main grid lines and a plurality of thin grid lines, the main grid lines are distributed at intervals along a first direction, and the thin grid lines are distributed at intervals along a second direction, and each main grid line is electrically connected with the plurality of thin grid lines.
The welding fixture comprises a mounting seat, a plurality of first pressing needle groups which are arranged at intervals along a first direction are arranged in a first space range of the mounting seat, a plurality of second pressing needle groups which are arranged at intervals along the first direction are arranged in a second space range of the mounting seat, the first pressing needle groups are in one-to-one correspondence with the main grid lines in the first area, the first pressing needle groups comprise a plurality of first pressing needles which are arranged at intervals along the second direction, the second pressing needle groups are in one-to-one correspondence with the main grid lines in the second area, and the second pressing needle groups comprise a plurality of second pressing needles which are arranged along the second direction.
2. The welding fixture of claim 1, wherein the mounting base comprises a mounting frame and a plurality of mounting ribs arranged on the mounting frame, the plurality of mounting ribs are arranged at intervals along a second direction, a plurality of mounting holes are formed in each mounting rib along a first direction, a first pressing needle or a second pressing needle is elastically and reciprocally mounted in the mounting holes, and the number of the mounting holes on a single mounting rib in the first space range corresponds to the number of main grid lines on the battery piece in the first area; the number of mounting holes on a single mounting rib in the second space range corresponds to the number of main grid lines on the battery piece in the second area.
3. The welding fixture of claim 2, wherein the mounting base comprises a mounting frame and a plurality of mounting ribs arranged on the mounting frame, the plurality of mounting ribs are arranged at intervals along a first direction, a plurality of mounting holes are arranged on the mounting ribs at intervals along a second direction, a first pressing needle or a second pressing needle is correspondingly arranged in each mounting hole in a reciprocating lifting manner, and the number of the mounting ribs in the first space range corresponds to the number of main grid lines on the battery piece in the first area; the number of the mounting ribs in the second space range corresponds to the number of the main grid lines on the battery piece in the second area.
4. The welding fixture of claim 2, wherein: the first space range and the second space range are sequentially arranged, or the first space range is positioned between the two second space ranges.
5. The welding fixture of claim 2, wherein: the first spatial range is located directly in between the two second spatial ranges.
6. The welding fixture of claim 2, wherein: the gate line electrode further includes a third spatial range, and the third spatial range is disposed on a side of the second spatial range away from the first spatial range.
7. The welding fixture of claim 1, wherein: the first area and the second area are sequentially arranged, or the first area is positioned between the two second areas.
8. The welding fixture of claim 7, wherein: the first region is located directly between the two second regions.
9. The welding fixture of claim 1, wherein: the distance between every two adjacent main grid lines in the first area is equal.
10. The welding fixture of claim 1, wherein: the distance between two adjacent main grid lines in the first area is 8.5-13mm.
11. The welding fixture of claim 10, wherein: in the first region, the distance between two adjacent main grid lines is 10-12mm; in the second region, the distance between two adjacent main grid lines is 9-11mm.
12. The welding fixture of claim 1, wherein: the number of the fine grid lines in the first area is 70-75, and the number of the fine grid lines in the second area is 65-70.
13. The welding fixture of claim 1, wherein: the gate line electrode further comprises a third region, and the third region is arranged on one side, away from the first region, of the second region.
14. The welding fixture of claim 13, wherein: the distance between two adjacent main grid lines in the third area is smaller than the distance between two adjacent main grid lines in the second area, and the distance between two adjacent thin grid lines in the third area is larger than the distance between two adjacent thin grid lines in the second area.
15. The welding fixture of claim 1, wherein: the number of the thin grid lines existing between the main grid line at the most side and the edge of the battery piece is more than that of the thin grid lines between two adjacent main grid lines.
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| CN202110998217.6A CN113690329B (en) | 2021-08-27 | 2021-08-27 | Battery piece, photovoltaic module and welding frock |
| CN202310993682.XA CN116845118A (en) | 2021-08-27 | 2021-08-27 | Battery piece, photovoltaic module and welding frock |
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| CN202110998217.6A CN113690329B (en) | 2021-08-27 | 2021-08-27 | Battery piece, photovoltaic module and welding frock |
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| CN116845118A (en) | 2023-10-03 |
| CN113690329A (en) | 2021-11-23 |
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