CN209071360U - A kind of novel more main grid solar batteries - Google Patents
A kind of novel more main grid solar batteries Download PDFInfo
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- CN209071360U CN209071360U CN201821938286.8U CN201821938286U CN209071360U CN 209071360 U CN209071360 U CN 209071360U CN 201821938286 U CN201821938286 U CN 201821938286U CN 209071360 U CN209071360 U CN 209071360U
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- 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
Abstract
The utility model discloses a kind of novel more main grid solar batteries, it is related to crystal silicon solar batteries field, front side of silicon wafer is equipped with 10-20 main gate line and several thin grid lines, by several length ellipses, with both ends, overlap mode is formed main gate line two-by-two, and two neighboring long oval both ends crossover region is printed with silver paste and the crossover region to reinforce pad；Thin grid line is straight line and is equally distributed on silicon wafer in parallel that straight line where the reinforcing pad in same main gate line is vertical with thin grid line, and thin grid line includes odd lines and even lines.The utility model provides a kind of novel more main grid solar battery sheets, it is advantageous that higher fill factor, silver paste consumption is significantly reduced, lesser active region shading-area effectively increases the photoelectric conversion efficiency of cell piece, therefore has vast potential for future development.
Description
Technical field
The utility model relates to crystal silicon solar batteries technical fields, more particularly to a kind of novel more main grid solar-electricities
Pond.
Background technique
Solar battery is the semiconductor devices for converting solar energy into electric energy, and grid line is the important component of battery,
It is responsible for the intracorporal photogenerated current of battery to guide to outside batteries.Sunlight enters battery, positive metal electricity from battery front side
Pole can block a part of silicon wafer, this part also can not just be transformed into electric energy, from this view, grid line according to luminous energy on the electrode
The thinner that does is the better.And the responsibility of grid line is to conduct electric current, from the angle analysis of resistivity, grid line gets over detailed rules and regulations conduction cross section
Product is smaller, and ohmic loss is bigger.Therefore main grid and the core of secondary grid design are that balance is obtained between shading and conduction.In addition,
Since the slurry main component of production grid line is the higher noble silver of price, and needed during battery is connected as component
The main grid of a piece of battery is welded by the back side of welding and adjacent cell, therefore the design of battery front side electrode also involves cost
The complicated aspect with welding procedure etc..In the case where 5 cun of silicon wafers account for the market mainstream, the electrode design of crystal silicon battery is all remain
Thin grid in people's impression cooperate the structure of 2 main grids.With becoming larger for die size in recent years, thin gate length is forced to lengthen；
And with the improvement of fabrography, wire mark grid line becomes thin；After silicon wafer cost substantially glides in recent years, for front electrode
Share of the silver paste material in battery production cost is gradually promoted.These factors all propose newly the design of battery front side electrode
Requirement.
In order to solve this contradiction, the solution that kyocera searches out is to increase the quantity of main grid.Can not only it subtract in this way
The distance that few electric current passes through in thin grid, also reduces the electric current of every main grid itself carrying.3 main grid structures can in battery level
To cooperate thinner grid line without significantly affecting fill factor, the quantity for increasing main grid is same to the resistance after reducing battery pack string
Sample is effective.Kyocera claim 3 main grid batteries " not only increase effective area of shining light, compared to traditional 2 main grid batteries, after optimization
3 main grid cell resistances loss it is smaller, it is more efficient." since 2009 in the industry gradually import three main grids, opened from this
The road of more main grid designs of industry, this volume production that takes the lead in of Aunar imports the design of four main grids comprehensively from 2013, and current some producers exist
Promote five main grid solar cell modules.The battery and establishment of component technique of three main grids, four main grids and five main grids substantially and pass
The two main grid batteries and establishment of component process variations of system are simultaneously little, are the processes of a gradual change.
But under the frame of the production in traditional wire mark battery, the increase of main grid quantity can reduce the loss of resistance really,
But its restricted place has lost a part of power, it is necessary to existing because main grid increases shading loss while increase
So-called more main grid batteries improve.
Utility model content
In order to solve the above technical problems, the utility model provides a kind of novel more main grid solar batteries, including silicon wafer,
Back electrode is adhered on silicon chip back side attachment back electric field, back electric field surface, and front side of silicon wafer is equipped with 10-20 main gate line and several thin grid
Line, by several length ellipses, with both ends, overlap mode is formed main gate line two-by-two, and two neighboring long oval both ends crossover region is printed with
Silver paste and the crossover region are to reinforce pad, and the reinforcing welding point uniform in same main gate line is distributed on same straight line；Thin grid
Line is straight line and is equally distributed on silicon wafer in parallel that straight line and thin grid line hang down where the reinforcing pad in same main gate line
Directly, thin grid line includes odd lines and even lines, and position of the odd lines between adjacent two main gate lines has interruption gap, even number
Line is through the positive continuous uninterrupted straight line of silicon wafer.
Technical effect: the utility model provides a kind of novel more main grid solar battery sheets, it is advantageous that higher
Fill factor, significantly reduces silver paste consumption, and the photoelectricity that lesser active region shading-area effectively increases cell piece turns
Efficiency is changed, therefore there is vast potential for future development.
The technical solution that the utility model further limits is:
The preceding novel more main grid solar batteries of one kind, the long ellipse of main gate line is composed of two single lines,
The area of crossover region is 0.25-1mm2。
The preceding novel more main grid solar batteries of one kind, the width of single line is 40 μm.
The number of the preceding novel more main grid solar batteries of one kind, the crossover region in every main gate line is 10-20.
The preceding novel more main grid solar batteries of one kind, main gate line both ends and silicon chip edge distance 0.5-1mm.
The preceding novel more main grid solar batteries of one kind, thin grid line quantity is 90-120.
The preceding novel more main grid solar batteries of one kind, the interruption gap of odd lines is 0.25-2mm.
The preceding novel more main grid solar batteries of one kind, main gate line welding are rod-shaped, including arc end and straight-bar end,
Arc end is above straight-bar end and the two end face is overlapped, and the diameter of arc end is 0.25-1mm, and straight-bar end height is arc end
Radius length.
The preceding novel more main grid solar batteries of one kind, front side of silicon wafer are equipped with the overlapping region of oblong, overlapping
Print Precious Metal in region.
The beneficial effects of the utility model are:
(1) main gate line is intersected Overlap design using curve in the utility model, and crossover region is printed with silver paste, while this
Assembly end is in reinforce pad, and the silver paste of crossover region is easier to connect with welding, reduces and make in thinner main grid welding process
At rosin joint probability and fragment rate；
(2) the utility model allows light beam to be directly reflected into cell piece surface or is reflected back glass and Air Interface
On, cell piece surface is returned to after interface forms total reflection, effective shaded area is reduced to the 50- of practical welding shielded area
70%；
(3) the utility model uses oblong recombination line, and two sides single line can effectively collect thin grid line electric current, multiple simultaneously
The crossover region at zygonema both ends prints stanniferous silver paste as pad is reinforced, so that grid line is when component section is welded, residual stress has
Effect reduces, and the probability that crack occurs in battery substantially reduces, and since grid line interval is small, even if there is crack, fragment in cell piece,
Such more main grid design battery function loss rates reduce, and can continue to keep the performance that preferably generates electricity；
(4) the utility model can more be embodied advantage optically compared to flat conventional welding, be reduced using cylindrical welding
Effective shielded area of cell piece, while the double absorption of incident light is increased, make cell piece improved efficiency 0.3-0.5%, group
Part power can promote 5-8w.
Detailed description of the invention
Fig. 1 is the cell piece overall schematic of the utility model；
Fig. 2 is the enlarged diagram of main gate line and thin grid line in the utility model；
Fig. 3 is the schematic cross-section of more main grid weldings in the utility model；
Wherein: 1, silicon wafer；2, overlapping region；3, pad is reinforced；4, main gate line；5, odd lines；6, even lines；7, glass
Glass；8, welding.
Specific embodiment
The novel more main grid solar batteries of one kind provided in this embodiment, structure as shown in Figure 1-3, include silicon wafer 1, silicon wafer
Back electrode is adhered on 1 back side attachment back electric field, back electric field surface.
1 front of silicon wafer is equipped with 14 thin grid lines of main gate line 4 and 108.Main gate line 4 by several length ellipse with both ends two-by-two
Overlap mode is formed, and the area of crossover region is 0.25-1mm2, silver paste and the crossover region are printed with to reinforce pad 3, same master
There are 16 reinforcing pads 3 on grid line 4 and is uniformly distributed on same straight line.The long ellipse of main gate line 4 is by two single line groups
It closes, the width of single line is 40 μm, 4 both ends of main gate line and 1 Edge Distance 0.5-1mm of silicon wafer.
Thin grid line is straight line and is equally distributed on silicon wafer 1 in parallel, where the reinforcing pad 3 in same main gate line 4
Straight line is vertical with thin grid line.The width of thin grid line is 20-50 μm, including 54 odd lines 5 and 54 even lines 6, and odd lines 5 exist
There is 0.5mm to be interrupted gap for position between adjacent two main gate lines 4, and even lines 6 are positive continuous uninterrupted through silicon wafer 1
Straight line.
The welding 8 of main gate line 4 be rod-shaped, the straight-bar end including arc end and cuboid, arc end above straight-bar end and
The two end face is overlapped, and the diameter of arc end is 0.4mm, and straight-bar end width 0.4mm is highly 0.2mm.
More main grid cell pieces can be conventional cell piece, or hetero-junction solar cell piece or half cell piece.Pass through
Silkscreen process printing back electrode silver paste, back field aluminum paste, more common silver pastes of main grid front electrode, front electrode oblong
Special Precious Metal is printed in overlapping region 2, and cell piece is made by drying and high-sintering process.Rear electrode quantity with just
Face main grid quantity is identical, and is parallel to each other.
The utility model uses oblong recombination line, and two sides single line can effectively collect thin grid line electric current, while compound
The crossover region at line both ends prints stanniferous silver paste as pad 3 is reinforced, so that grid line is when component section is welded, residual stress is effective
It reducing, the probability that crack occurs in battery substantially reduces, and since grid line interval is small, even if there is crack, fragment in cell piece, this
The more main grids design battery function loss rates of kind reduce, and can continue to keep preferably generating electricity to show.Using cylindrical welding 8, compared to flat
Conventional welding can more embody advantage optically, reduce effective shielded area of cell piece, while increase the two of incident light
Secondary absorption, makes cell piece improved efficiency 0.3-0.5%, and component power can promote 5-8w.
In addition to the implementation, the utility model can also have other embodiments；It is all to use equivalent replacement or equivalent change
The technical solution to be formed is changed, the protection scope of the requires of the utility model is all fallen within.
Claims (9)
1. a kind of novel more main grid solar batteries, including silicon wafer (1), silicon wafer (1) back side attachment back electric field, the back electricity
Back electrode is adhered on field surface, it is characterised in that: silicon wafer (1) front is equipped with 10-20 main gate line (4) and several thin grid
Line, by several length ellipses, with both ends, overlap mode is formed the main gate line (4) two-by-two, and the two neighboring long oval both ends are handed over
Folded area is printed with the reinforcing pad of silver paste and the crossover region to reinforce pad (3), on the same main gate line (4)
(3) it is uniformly distributed on same straight line；The thin grid line is straight line and is equally distributed on the silicon wafer (1) in parallel, same
Straight line where the reinforcing pad (3) on the main gate line (4) is vertical with the thin grid line, and the thin grid line includes odd number
Line (5) and even lines (6), position of the odd lines (5) between adjacent two main gate lines (4) have interruption gap,
The even lines (6) are through the positive continuous uninterrupted straight line of the silicon wafer (1).
2. the novel more main grid solar batteries of one kind according to claim 1, it is characterised in that: the main gate line (4)
Long ellipse is composed of two single lines, and the area of the crossover region is 0.25-1mm2.
3. the novel more main grid solar batteries of one kind according to claim 2, it is characterised in that: the width of the single line is
40μm。
4. the novel more main grid solar batteries of one kind according to claim 3, it is characterised in that: every main gate line
(4) number of the crossover region on is 10-20.
5. the novel more main grid solar batteries of one kind according to claim 4, it is characterised in that: the main gate line (4) two
End and the silicon wafer (1) Edge Distance 0.5-1mm.
6. the novel more main grid solar batteries of one kind according to claim 1, it is characterised in that: the thin grid line quantity is
90-120。
7. the novel more main grid solar batteries of one kind according to claim 6, it is characterised in that: the odd lines (5)
Interruption gap is 0.25-2mm.
8. the novel more main grid solar batteries of one kind according to claim 1, it is characterised in that: the main gate line (4)
Welding (8) is rod-shaped, including arc end and straight-bar end, and the arc end is above the straight-bar end and the two end face is overlapped, institute
The diameter for stating arc end is 0.25-1mm, and straight-bar end height is the radius length of the arc end.
9. the novel more main grid solar batteries of one kind according to claim 1, it is characterised in that: silicon wafer (1) front
Overlapping region (2) equipped with oblong, the overlapping region (2) print Precious Metal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821938286.8U CN209071360U (en) | 2018-11-23 | 2018-11-23 | A kind of novel more main grid solar batteries |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821938286.8U CN209071360U (en) | 2018-11-23 | 2018-11-23 | A kind of novel more main grid solar batteries |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209071360U true CN209071360U (en) | 2019-07-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821938286.8U Expired - Fee Related CN209071360U (en) | 2018-11-23 | 2018-11-23 | A kind of novel more main grid solar batteries |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110957379A (en) * | 2019-11-29 | 2020-04-03 | 晋能光伏技术有限责任公司 | Multi-grid electrode structure, heterojunction solar cell with same and preparation method of heterojunction solar cell |
| CN112331733A (en) * | 2020-11-17 | 2021-02-05 | 通威太阳能（成都）有限公司 | MBB main grid battery structure adopting semicircular welding wires |
-
2018
- 2018-11-23 CN CN201821938286.8U patent/CN209071360U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110957379A (en) * | 2019-11-29 | 2020-04-03 | 晋能光伏技术有限责任公司 | Multi-grid electrode structure, heterojunction solar cell with same and preparation method of heterojunction solar cell |
| CN112331733A (en) * | 2020-11-17 | 2021-02-05 | 通威太阳能（成都）有限公司 | MBB main grid battery structure adopting semicircular welding wires |
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190705 Termination date: 20201123 |