CN207338393U - The backplate and battery of p-type PERC double-sided solar batteries - Google Patents
The backplate and battery of p-type PERC double-sided solar batteries Download PDFInfo
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- CN207338393U CN207338393U CN201720202771.8U CN201720202771U CN207338393U CN 207338393 U CN207338393 U CN 207338393U CN 201720202771 U CN201720202771 U CN 201720202771U CN 207338393 U CN207338393 U CN 207338393U
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- silver
- gate line
- alum gate
- main grid
- colored main
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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
- Y02E10/547—Monocrystalline silicon PV cells
Abstract
The utility model discloses a kind of backplate of p-type PERC double-sided solar batteries, including at least 2 silver-colored main grids of the back of the body and 25 500 alum gate lines being parallel to each other being parallel to each other, the alum gate line and the silver-colored main grid vertical connection of the back of the body；Alum gate line forms overlapping region with the silver-colored main grid junction of the back of the body, and the silver-colored main grid of the back of the body of overlapping region is located at the lower section of alum gate line.It is simple in structure using the utility model the invention also discloses a kind of p-type PERC double-sided solar batteries, easy industrialization, while improve the photoelectric conversion efficiency of battery.
Description
Technical field
It the utility model is related to area of solar cell, more particularly to a kind of back side of p-type PERC double-sided solar batteries
Electrode, correspondingly, the utility model further relate to a kind of p-type PERC double-sided solar batteries.
Background technology
Solar cell power generation is that solar energy is converted into electric energy using solar cell, since it is green ring
Product is protected, environmental pollution will not be caused, and is renewable resource, so in the case of current energy shortage, solar-electricity
Pond is a kind of novel energy for having broad based growth future.
The production process of p-type PERC double-sided solar batteries includes：Making herbs into wool, diffusion, etching, backside passivation layer deposition,
PECVD back side coating films, front PECVD plated films, silk-screen printing, sintering, anti-LID annealing.Solar battery sheet is changed by luminous energy
During electric energy, its internal photo-generated carrier produced needs the electrode by exterior printing to collect and draw, Ran Houyu
External circuit connects, so that electric current be transported out.Above-mentioned silkscreen process is further subdivided into solar cell
Carry on the back primary gate electrode printing, the secondary gate electrode printing of the back of the body and positive electrode printing.Positive electrode slurry and back electrode slurry are printed on crystal silicon too
On positive battery front side, through oversintering, play the role of collected current.In the encapsulation link of battery, by being welded in positive backplate
Cell piece, is connected into battery strings by upper welding, then forms one piece of big component by processes such as laminations.Backplate figure is set
Meter not only determines the passivating back effect and electric current collection effect of back of the body passivation cell, so as to influence the opto-electronic conversion effect of battery
Rate, also determines the complexity of scale production process.Therefore need to propose a kind of new backplate, it is simple in structure, easily
Industrialization, while improve the photoelectric conversion efficiency of battery.
The content of the invention
The technical problem to be solved by the utility model is to, there is provided a kind of back side of p-type PERC double-sided solar batteries
Electrode, simple in structure, easy industrialization, while improve the photoelectric conversion efficiency of battery.
The technical problem to be solved by the utility model is to, there is provided a kind of p-type PERC double-sided solar batteries, can be two-sided
Sunlight, simple in structure, easy industrialization are absorbed, while improves the photoelectric conversion efficiency of component,
In order to solve the above-mentioned technical problem, the utility model provides a kind of back side of p-type PERC double-sided solar batteries
Electrode, including the alum gate line that the silver-colored main grid of at least 2 back ofs the body being parallel to each other and 25-500 bars are parallel to each other, the alum gate line and back of the body silver
Main grid vertical connection；
Alum gate line forms overlapping region with the silver-colored main grid junction of the back of the body, and the silver-colored main grid of the back of the body of overlapping region is located under alum gate line
Side.
As the optimal technical scheme of aforementioned p-type PERC double-sided solar battery backplates, silver-colored main grid both sides and number are carried on the back
Equal alum gate line overlap is measured to intersect；Or the silver-colored main grid both sides of every back of the body are intersected with alum gate line overlap in varying numbers.
As the optimal technical scheme of aforementioned p-type PERC double-sided solar battery backplates, positioned at the silver-colored main grid both sides of the back of the body
Alum gate line on the same line；Or the alum gate line positioned at the silver-colored main grid both sides of the back of the body is interspersed.
As the optimal technical scheme of aforementioned p-type PERC double-sided solar battery backplates, the spacing between alum gate line
It is equal or unequal.
As the optimal technical scheme of aforementioned p-type PERC double-sided solar battery backplates, the back of the body silver main grid and aluminium
The pattern for the overlapping region that grid line is formed is triangle, quadrangle, semicircle or pentagon.
As the optimal technical scheme of aforementioned p-type PERC double-sided solar battery backplates, the width of the alum gate line
For 30-550 μm.
As the optimal technical scheme of aforementioned p-type PERC double-sided solar battery backplates, the width of the silver-colored main grid of the back of the body
Spend for 0.5-5mm.
As the optimal technical scheme of aforementioned p-type PERC double-sided solar battery backplates, every section of alum gate line and back of the body silver
The length in part along alum gate direction that main grid overlaps is 0.05-2mm.
Correspondingly, the utility model also provides a kind of p-type PERC double-sided solar batteries, including the backplate, the back of the body
Face silicon nitride film, backside oxide aluminium film, P-type silicon, N-type emitter, front side silicon nitride film and positive silver electrode；The backplate,
Back side silicon nitride, backside oxide aluminium film, P-type silicon, N-type emitter, front side silicon nitride film and positive silver electrode are from bottom to up successively
Stacking connection.
The backplate includes the alum gate line that the silver-colored main grid of at least 2 back ofs the body being parallel to each other and 25-500 bars are parallel to each other,
The alum gate line and the silver-colored main grid vertical connection of the back of the body；
Alum gate line forms overlapping region with the silver-colored main grid junction of the back of the body, and the silver-colored main grid of the back of the body of overlapping region is located under alum gate line
Side；
The silver-colored main grid of the back of the body is arranged under back side silicon nitride, and the back side silicon nitride and backside oxide aluminium film are through too drastic
The laser slotting area formed after light fluting；The alum gate line is connected by laser slotting area with P-type silicon.
Implement the utility model embodiment, have the advantages that：
The backplate of p-type PERC double-sided solar batteries described in the utility model, can both substitute the existing single side sun
The effect of full aluminum back electric field, also has the function of current－carrying conductor, suitable for being installed in the two-sided sun of p-type PERC in energy battery structure
The back side of energy battery is as backplate.It is simple in structure, easy industrialization, while improve the photoelectric conversion efficiency of battery.Using
The p-type PERC double-sided solar batteries of backplate described in the utility model can save silver paste and the dosage of aluminium paste, reduce production
Cost, and realize two-sided absorption luminous energy, it is significantly expanded the application range of solar cell and improves photoelectric conversion efficiency.
Brief description of the drawings
Fig. 1 is a kind of structure diagram of p-type PERC double-sided solar battery backplates of the utility model；
Fig. 2 is enlarged drawing at Figure 1A；
Fig. 3 is a kind of structure diagram of p-type PERC double-sided solar batteries of the utility model.
Embodiment
It is new to this practicality below in conjunction with attached drawing to make the purpose of this utility model, technical solution and advantage clearer
Type is described in further detail.
In recent years, with the further investigation of scientist and technical staff, it was found that a kind of PERC solar energy of passivating back
Battery can further improve the photoelectric conversion efficiency of battery.But the pellumina conductivity in backside passivation film is extremely low, it is difficult to
By electric transmission to backplate, therefore conventional way is slotted below grid line, and when printing grid line, silver paste can be filled into out
Ohmic contact is formed with P-type silicon in groove area, so as to fulfill conducting function.
Existing PERC single sides solar cell is equipped with the whole back of the body that full aluminum back electric field is covered in silicon chip at the back side of battery
Face, the effect of full aluminum back electric field are to improve open-circuit voltage Voc and short circuit current flow Jsc, force minority carrier away from surface, few
Number Carrier recombination rate reduces, so as to improve battery efficiency on the whole.However, since full aluminum back electric field is light tight, have
The rear surface of solar cell of full aluminum back electric field can not absorb luminous energy, positive can only absorb luminous energy, its photoelectric conversion efficiency is difficult to greatly
The raising of amplitude.
For this reason, the utility model proposes a kind of new backplate, existing single side solar battery structure can have both been substituted
In full aluminum back electric field effect, also there is current－carrying conductor, the back of the body suitable for being installed in p-type PERC double-sided solar batteries
Face is as backplate.
As illustrated in fig. 1 and 2, the utility model provides a kind of backplate of p-type PERC double-sided solar batteries, including extremely
The alum gate line 2 that the silver-colored main grid 1 of few 2 back ofs the body being parallel to each other and 25-500 bars are parallel to each other, the alum gate line 2 hang down with the silver-colored main grid 1 of the back of the body
It is direct-connected to connect；
Alum gate line 2 forms overlapping region with silver-colored 1 junction of main grid of the back of the body, and the silver-colored main grid 1 of the back of the body of overlapping region is located at alum gate line 2
Lower section.Backplate described in the utility model is arranged on the lower section of back side silicon nitride 3, and can absorb the sun to adapt to the back side
Light, no longer sets full aluminum back electric field, but is changed to set the alum gate line 2 of many bars, is overleaf nitrogenized using laser slotting technology
Laser slotting area 9 is opened up in silicon fiml 3 and backside oxide aluminium film 4, and alum gate line 2 is printed on the laser slotting area that these are arranged in parallel
On 9, so as to form localized contact with P-type silicon 5, the alum gate line 2 of intensive parallel arrangement, which can not only play, improves open-circuit voltage Voc
With short circuit current flow Jsc, minority carrier recombination rate is reduced, improves the effect of cell photoelectric transfer efficiency, alternative existing single side
The full aluminum back electric field of battery structure, and alum gate line 2 does not cover the back side of silicon chip comprehensively, and sunlight can be between alum gate line 2
Sensitive area be projected in silicon chip, absorb luminous energy so as to fulfill silicon chip back side, greatly improve the photoelectric conversion efficiency of battery.
Preferably, the radical of the alum gate line 2 is 30-350 bars, and more preferably, the radical of the alum gate line 2 is 50-300
Bar；The width of the alum gate line 2 is 30-550 μm.
As can be known from Fig. 2, inventor is had found when overlapping region 10 is in 0.05-2mm scopes, the electric conductivity of backplate
It is good, as 10 length of overlapping region is less than 0.05mm, then easily it is in contact bad, is more than 5mm such as 10 length of overlapping region, then
Aluminium paste is wasted, and since the area of overlapping region 10 is excessive, molding back of the body silver main grid 1 and alum gate line 2 are because of physics such as the coefficients of expansion
Performance differs, and alum gate line 2 easily occurs during battery use and is peeled off from the silver-colored main grid 1 of the back of the body, or alum gate line 2 and the silver-colored main grid 1 of the back of the body
Intersection is broken, so as to influence the stability of battery quality and performance.The utility model people passes through prolonged and repeated contrast
Experiment finds that, when 10 length of overlapping region of the silver-colored main grid 1 of the back of the body and alum gate line 2 is in 0.05-2mm scopes, battery performance is optimal.
It should be noted that the pattern for the overlapping region 10 that the silver-colored main grid 1 of the back of the body described in the utility model is formed with alum gate line 2 is
Triangle, quadrangle, semicircle or pentagon.Specifically, 10 pattern of overlapping region is identical on the silver-colored main grid 1 of the same back of the body；It is or same
10 pattern of overlapping region differs on the silver-colored main grid 1 of one back of the body.
Preferably, the silver-colored main grid both sides alum gate line overlap equal with quantity is carried on the back to intersect；Or the silver-colored main grid both sides of every back of the body and number
The alum gate line overlap that amount does not wait intersects.
Positioned at the silver-colored main grid both sides of the back of the body alum gate line on the same line；Or positioned at the silver-colored main grid both sides of the back of the body alum gate line not same
On one straight line, it is interspersed.
Spacing between alum gate line is equal or unequal.
Example in Fig. 1 is equipped with the equal alum gate line of quantity for the silver-colored main grid both sides of the back of the body, and positioned at the aluminium on the silver-colored main grid both sides of the back of the body
On the same line, overlapping region is square to grid line.
Correspondingly, as shown in figure 3, the utility model also provides a kind of p-type PERC double-sided solar batteries, the p-type
PERC double-sided solar batteries include the backplate, back side silicon nitride 3, backside oxide aluminium film 4, P-type silicon 5, N-type transmitting
Pole 6, front side silicon nitride film 7 and positive silver electrode 8；The backplate, back side silicon nitride 3, backside oxide aluminium film 4, P-type silicon 5,
N-type emitter 6, front side silicon nitride film 7 and positive silver electrode 8 stack gradually connection from bottom to up.
The backplate includes the alum gate line that the silver-colored main grid 1 of at least 2 back ofs the body being parallel to each other and 25-500 bars are parallel to each other
2, the alum gate line 2 is with carrying on the back 1 vertical connection of silver-colored main grid；
Alum gate line 2 forms overlapping region 10 with silver-colored 1 junction of main grid of the back of the body, and the back of the body silver main grid 1 of overlapping region 10 is located at alum gate
The lower section of line 2；
The silver-colored main grid 1 of the back of the body is arranged under back side silicon nitride 3, and the back side silicon nitride 3 and backside oxide aluminium film 4 pass through
The laser slotting area formed is crossed after laser slotting；The alum gate line 2 is connected by laser slotting area with P-type silicon 5.
The existing whole backplate of single side solar cell is all made of silver paste, with existing single side solar cell phase
Than p-type PERC double-sided solar batteries described in the utility model are using the silver-colored main grid 1 of some back ofs the body and a plurality of alum gate being arranged in parallel
Line 2 forms, and alum gate line 2 not only substitutes full aluminum back electric field in existing single side solar cell and realizes back side extinction, is additionally operable to conduct
Electronics.
Finally, using the p-type PERC double-sided solar batteries of backplate described in the utility model, silver paste can be saved
With the dosage of aluminium paste, reduce production cost, and realize two-sided absorption luminous energy, be significantly expanded solar cell application range and
Improve photoelectric conversion efficiency.
It should be noted that above example is only illustrating the technical solution of the utility model rather than to the utility model
The limitation of protection domain, although being explained in detail with reference to preferred embodiment to the utility model, the ordinary skill people of this area
Member is it should be appreciated that can be to the technical solution of the utility model technical scheme is modified or replaced equivalently, without departing from the utility model
The spirit and scope of technical solution.
Claims (9)
1. a kind of backplate of p-type PERC double-sided solar batteries, it is characterised in that including at least 2 back ofs the body being parallel to each other
The alum gate line that silver-colored main grid and 25-500 bar is parallel to each other, the alum gate line and the silver-colored main grid vertical connection of the back of the body；
Alum gate line forms overlapping region with the silver-colored main grid junction of the back of the body, and the silver-colored main grid of the back of the body of overlapping region is located at the lower section of alum gate line.
2. the backplate of p-type PERC double-sided solar batteries as claimed in claim 1, it is characterised in that the silver-colored main grid both sides of the back of the body
The alum gate line overlap equal with quantity intersects；Or the silver-colored main grid both sides of every back of the body are intersected with alum gate line overlap in varying numbers.
3. the backplate of p-type PERC double-sided solar batteries as claimed in claim 1, it is characterised in that positioned at the silver-colored main grid of the back of the body
The alum gate line on both sides is on the same line；Or the alum gate line positioned at the silver-colored main grid both sides of the back of the body is interspersed.
4. the backplate of p-type PERC double-sided solar batteries as claimed in claim 1, it is characterised in that between alum gate line
Spacing is equal or unequal.
5. the backplate of p-type PERC double-sided solar batteries as claimed in claim 1, it is characterised in that the silver-colored main grid of the back of the body
The pattern of the overlapping region formed with alum gate line is triangle, quadrangle, semicircle or pentagon.
6. the backplate of p-type PERC double-sided solar batteries as claimed in claim 1, it is characterised in that the alum gate line
Width is 30-550 μm.
7. the backplate of p-type PERC double-sided solar batteries as claimed in claim 1, it is characterised in that the silver-colored main grid of the back of the body
Width be 0.5-5mm.
8. the backplate of p-type PERC double-sided solar batteries as claimed in claim 1, it is characterised in that every section of alum gate line with
The length in part along alum gate direction that the silver-colored main grid of the back of the body overlaps is 0.05-2mm.
9. a kind of p-type PERC double-sided solar batteries, it is characterised in that including backplate, back side silicon nitride, backside oxide
Aluminium film, P-type silicon, N-type emitter, front side silicon nitride film and positive silver electrode；The backplate, back side silicon nitride, back side oxygen
Change aluminium film, P-type silicon, N-type emitter, front side silicon nitride film and positive silver electrode and stack gradually connection from bottom to up；
The backplate includes the alum gate line that the silver-colored main grid of at least 2 back ofs the body being parallel to each other and 25-500 bars are parallel to each other, described
Alum gate line and the silver-colored main grid vertical connection of the back of the body；
Alum gate line forms overlapping region with the silver-colored main grid junction of the back of the body, and the silver-colored main grid of the back of the body of overlapping region is located at the lower section of alum gate line；
The silver-colored main grid of the back of the body is arranged under back side silicon nitride, and the back side silicon nitride and backside oxide aluminium film are opened by laser
The laser slotting area formed after groove；The alum gate line is connected by laser slotting area with P-type silicon.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720202771.8U CN207338393U (en) | 2017-03-03 | 2017-03-03 | The backplate and battery of p-type PERC double-sided solar batteries |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720202771.8U CN207338393U (en) | 2017-03-03 | 2017-03-03 | The backplate and battery of p-type PERC double-sided solar batteries |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207338393U true CN207338393U (en) | 2018-05-08 |
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ID=62374632
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720202771.8U Active CN207338393U (en) | 2017-03-03 | 2017-03-03 | The backplate and battery of p-type PERC double-sided solar batteries |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207338393U (en) |
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2017
- 2017-03-03 CN CN201720202771.8U patent/CN207338393U/en active Active
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