CN204991727U - Solar cell back electrode - Google Patents
Solar cell back electrode Download PDFInfo
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- CN204991727U CN204991727U CN201520723585.XU CN201520723585U CN204991727U CN 204991727 U CN204991727 U CN 204991727U CN 201520723585 U CN201520723585 U CN 201520723585U CN 204991727 U CN204991727 U CN 204991727U
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Abstract
The utility model discloses a solar cell back electrode, including back electrode and back of the body electric field, the back electrode is inlayed in back of the body electric field, back of the body electric field includes uniform thickness district and variable thickness district gradually, and gradually the variable thickness district surrounds around the uniform thickness district, gradually the variable thickness district thickness from with uniform thickness district junction to the attenuation gradually of battery edge. Compared with the prior art, the utility model has following beneficial effects: : to carry on the back electric field and solar cell will carry on the back the electric field and divide gradually the variable thickness district into and distinguish with uniform thickness, gradually the variable thickness district surrounds around uniform thickness distinguishes, gradually the thickness in variable thickness district is distinguished to the attenuation gradually of battery edge from uniform thickness, in the time of can guaranteeing the screen printing al thick liquid like this, because marginal portion thickness is little, the al thick liquid hardly extends to solar cell's cross -section, and has the advantages of low cost, the applied technology is simple, and is suitable for wholesale manufacture, can prevent the battery short circuit, the advantage that reduces the electric leakage and promote conversion efficiency.
Description
Technical field
The utility model relates to technical field of solar batteries, particularly relates to a kind of rear surface of solar cell electrode.
Background technology
The electrode primary responsibility collected current of solar cell, utilizes electrode to be derived by electric current, provides load to use.The electrode of solar cell is divided into front electrode and backplate, and front electrode is made up of main gate line and secondary grid line, and the front electrode of industrialization adopts Ag material, and Cu front electrode is also under development, is expected to the replacement material becoming Ag electrode.Backplate is made up of back electrode and back of the body electric field, and the backplate of industrialization carries on the back electric field by Al and Ag back electrode forms, and Ag back electrode is responsible for collected current on the one hand, can form good welding in addition with welding; Al carries on the back the effect that electric field has gettering, transoid and collected current, has a great impact the conversion efficiency tool of battery.Therefore, because Al back surface field is very large on the impact of solar cell electric property, the research for Al back surface field gets more and more, and mainly concentrates on the pattern of Al electrode print slurry and Al electrode.The edge of Al back surface field and the spacing of silicon chip edge are more than 0.5mm, time so mainly in order to prevent Al from starching printing, because the thickness of Al slurry is large, mobility is strong, Al slurry is easy to be extended on the cross section of solar cell, make the front and back short circuit of solar cell, the electric leakage probability of battery is large, affects quality and the conversion efficiency of solar cell; In addition, the edge of Al back surface field and the spacing of silicon chip edge larger, the series resistance of battery is larger, can reduce the conversion efficiency of battery.
Utility model content
Technical problem to be solved in the utility model is, provides a kind of rear surface of solar cell electrode, can prevent the short circuit of solar cell, reduces electric leakage, improves conversion efficiency.
In order to solve the problems of the technologies described above, the utility model provides a kind of rear surface of solar cell electrode, comprise back electrode and back of the body electric field, back electrode is embedded in back of the body electric field, described back of the body electric field comprises uniform thickness district and progressive thickness district, progressive thickness district is enclosed in uniform thickness district surrounding, and the thickness in progressive thickness district is from thinning gradually to battery edge with junction, uniform thickness district.
As the improvement of such scheme, described progressive thickness district is identical with the thickness of junction, uniform thickness district.
As the improvement of such scheme, the thickness y in described progressive thickness district and progressive thickness district to cell piece edge distance x between functional relation be: y=-2.5x+15.
As the improvement of such scheme, the thickness of described progressive thickness district near solar battery edge place is 3-10 μm.
As the improvement of such scheme, the thickness in described uniform thickness district is 20-35 μm.
As the improvement of such scheme, the length of side of described solar cell is 125-156mm, and progressive thickness sector width is 2-6mm, and progressive thickness district and solar battery edge spacing are 0.1-0.5mm.Progressive thickness district and solar battery edge spacing are dropped to below 0.5mm, there is the series resistance that can reduce solar cell, improve the advantage of the conversion efficiency of battery.
As the improvement of such scheme, described back electrode is prepared from by screen-printed metal slurry.
As the improvement of such scheme, described back electrode is Ag material.
As the improvement of such scheme, described back of the body electric field is Al material.
Compared with prior art, the utility model has following beneficial effect: back of the body electric field is divided into progressive thickness district and uniform thickness district by back of the body electric field and solar cell, progressive thickness district is enclosed in uniform thickness district surrounding, the thickness in progressive thickness district is thinning gradually to battery edge from uniform thickness district, when can ensure that silk screen printing Al starches like this, because brim-portion thickness is little, Al slurry is difficult to the cross section being extended to solar cell, have that cost is low, technique is simple, be applicable to producing in enormous quantities, battery short circuit can be prevented, reduce electric leakage and promote the advantage of conversion efficiency.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of rear surface of solar cell electrode of the present utility model.
Fig. 2 is the vertical view of Fig. 1.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearly, below in conjunction with accompanying drawing, the utility model is described in further detail.
As shown in Figure 1 and Figure 2, a kind of rear surface of solar cell electrode of the present utility model, comprise back electrode 1 and back of the body electric field 2, back electrode 1 is embedded in back of the body electric field 2, back of the body electric field 2 comprises uniform thickness district 21 and progressive thickness district 22, progressive thickness district 22 is enclosed in uniform thickness district 21 surrounding, and the thickness in progressive thickness district 22 is from thinning gradually to battery edge with junction, uniform thickness district 21, and progressive thickness district 22 is identical with the thickness of junction, uniform thickness district 21.The thickness y in progressive thickness district 22 and progressive thickness district 22 to cell piece edge distance x between functional relation be: y=-2.5x+15.
The thickness in uniform thickness district 21 is 20-35 μm, and the thickness in concrete uniform thickness district 21 is 20 μm, 23 μm, 25 μm, 27 μm, 30 μm, 32 μm, 35 μm, but is not limited thereto.The thickness of progressive thickness district 22 near solar battery edge place is 3-10 μm, and the thickness of concrete progressive thickness district 22 near solar battery edge place is 3 μm, 5 μm, 7 μm, 10 μm, but is not limited thereto.
The length of side of solar cell is 125-156mm, and the length of side of concrete solar cell is 125mm, 131mm, 136mm, 140mm, 145mm, 149mm, 153mm, 156mm, but is not limited thereto.The width in progressive thickness district 22 is 2-6mm, and the length of side of concrete solar cell is 2mm, 4mm, 6mm, but is not limited thereto.
Progressive thickness district 22 and solar battery edge spacing are 0.1-0.5mm, and concrete progressive thickness district 22 is 0.1mm, 0.3mm, 0.5mm with solar battery edge spacing, but is not limited thereto.Progressive thickness district 22 is dropped to below 0.5mm with solar battery edge spacing, there is the series resistance that can reduce solar cell, improve the advantage of the conversion efficiency of battery.
Back electrode 1 is prepared from by screen-printed metal slurry, and preferably, back electrode 1 is Ag material.Back of the body electric field 2 is Al material.
Compared with prior art, the utility model has following beneficial effect: back of the body electric field 2 is divided into progressive thickness district 22 and uniform thickness district 21, progressive thickness district 22 is enclosed in uniform thickness district 21 surrounding, the thickness in progressive thickness district 22 is thinning gradually to battery edge from uniform thickness district 22, when can ensure that silk screen printing Al starches like this, because brim-portion thickness is little, Al slurry is difficult to the cross section being extended to solar cell, have that cost is low, technique is simple, be applicable to producing in enormous quantities, battery short circuit can be prevented, reduce electric leakage and promote the advantage of conversion efficiency.
The above is preferred implementation of the present utility model; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the utility model principle; can also make some improvements and modifications, these improvements and modifications are also considered as protection range of the present utility model.
Claims (9)
1. a rear surface of solar cell electrode, comprise back electrode and back of the body electric field, back electrode is embedded in back of the body electric field, it is characterized in that, described back of the body electric field comprises uniform thickness district and progressive thickness district, progressive thickness district is enclosed in uniform thickness district surrounding, and the thickness in progressive thickness district is from thinning gradually to battery edge with junction, uniform thickness district.
2. a kind of rear surface of solar cell electrode as claimed in claim 1, is characterized in that, described progressive thickness district is identical with the thickness of junction, uniform thickness district.
3. a kind of rear surface of solar cell electrode as claimed in claim 1, is characterized in that, the thickness y in described progressive thickness district and progressive thickness district to cell piece edge distance x between functional relation be: y=-2.5x+15.
4. a kind of rear surface of solar cell electrode as claimed in claim 1, is characterized in that, the thickness of described progressive thickness district near solar battery edge place is 3-10 μm.
5. a kind of rear surface of solar cell electrode as claimed in claim 1, is characterized in that, the thickness in described uniform thickness district is 20-35 μm.
6. a kind of rear surface of solar cell electrode as claimed in claim 1, is characterized in that, the length of side of described solar cell is 125-156mm, and progressive thickness sector width is 2-6mm, and progressive thickness district and solar battery edge spacing are 0.1-0.5mm.
7. a kind of rear surface of solar cell electrode as claimed in claim 1, it is characterized in that, described back electrode is prepared from by screen-printed metal slurry.
8. a kind of rear surface of solar cell electrode as claimed in claim 7, is characterized in that, described back electrode is Ag material.
9. a kind of rear surface of solar cell electrode as claimed in claim 1, is characterized in that, described back of the body electric field is Al material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520723585.XU CN204991727U (en) | 2015-09-17 | 2015-09-17 | Solar cell back electrode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520723585.XU CN204991727U (en) | 2015-09-17 | 2015-09-17 | Solar cell back electrode |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204991727U true CN204991727U (en) | 2016-01-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520723585.XU Active CN204991727U (en) | 2015-09-17 | 2015-09-17 | Solar cell back electrode |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204991727U (en) |
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2015
- 2015-09-17 CN CN201520723585.XU patent/CN204991727U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 528100, Sanshui District, Guangdong City, Foshan Industrial Park, No. C District, No. 69 Patentee after: GUANGDONG AIKO SOLAR ENERGY TECHNOLOGY Co.,Ltd. Address before: 528100, Sanshui District, Guangdong City, Foshan Industrial Park, No. C District, No. 69 Patentee before: GUANGDONG AIKO SOLAR ENERGY TECHNOLOGY Co.,Ltd. |
|
| CP01 | Change in the name or title of a patent holder | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20180108 Address after: 528100, Sanshui District, Guangdong City, Foshan Industrial Park, No. C District, No. 69 Co-patentee after: ZHEJIANG AIKO SOLAR ENERGY TECHNOLOGY Co.,Ltd. Patentee after: GUANGDONG AIKO SOLAR ENERGY TECHNOLOGY Co.,Ltd. Address before: 528100, Sanshui District, Guangdong City, Foshan Industrial Park, No. C District, No. 69 Patentee before: GUANGDONG AIKO SOLAR ENERGY TECHNOLOGY Co.,Ltd. |
|
| TR01 | Transfer of patent right |