CN105047731A - Back contact solar cell module - Google Patents
Back contact solar cell module Download PDFInfo
- Publication number
- CN105047731A CN105047731A CN201510381207.2A CN201510381207A CN105047731A CN 105047731 A CN105047731 A CN 105047731A CN 201510381207 A CN201510381207 A CN 201510381207A CN 105047731 A CN105047731 A CN 105047731A
- Authority
- CN
- China
- Prior art keywords
- solar cell
- back contact
- contact solar
- foil layer
- metal foil
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000011888 foil Substances 0.000 claims abstract description 22
- 239000002184 metal Substances 0.000 claims abstract description 20
- 229910052751 metal Inorganic materials 0.000 claims abstract description 20
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000011889 copper foil Substances 0.000 claims abstract description 18
- 238000005520 cutting process Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 description 12
- 239000000853 adhesive Substances 0.000 description 5
- 230000001070 adhesive effect Effects 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- 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
- H01L31/022441—Electrode arrangements specially adapted for back-contact 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
- H01L31/0248—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 characterised by their semiconductor bodies
- H01L31/0352—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 characterised by their semiconductor bodies characterised by their shape or by the shapes, relative sizes or disposition of the semiconductor regions
- H01L31/035272—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 characterised by their semiconductor bodies characterised by their shape or by the shapes, relative sizes or disposition of the semiconductor regions characterised by at least one potential jump barrier or surface barrier
- H01L31/035281—Shape of the body
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Photovoltaic Devices (AREA)
Abstract
The invention discloses a back contact solar cell module, which comprises a conductive back sheet foil and a plurality of back contact solar cells arranged on the conductive back sheet foil, wherein metal foil layers and back sheet layers are overlapped to form the conductive back sheet foil; the length L of the back contact solar cells along the serial column direction is smaller than or equal to 10cm; the thickness H of the metal foil layer is smaller than 10 micrometer; and the ratio of the thickness H of the metal foil layer to the length L of the back contact solar cells is 1 to 5000-1 to 20000. Resistance loss of the module and consumption cost of the copper foil are perfectly coordinated, and maximization of earnings is realized.
Description
Technical field
The present invention relates to area of solar cell, be specifically related to a kind of back contact solar cell assembly.
Background technology
Conventional fossil fuel approach exhaustion day by day, in existing sustainable energy, solar energy is undoubtedly the most clean, the most general and most potential alternative energy source of one.Device of solar generating is also called solar cell or photovoltaic cell, solar energy can be directly changed into electric energy, and its electricity generating principle is the photovoltaic effect of based semiconductor PN junction.High efficiency is the development trend of current solar cell, by improving the passivation of surface-texturing, selective emitter junction, front surface and back surface, laser buries the technology such as grid to improve the transformation efficiency of solar cell, but because it needs special equipment and complicated technological process, industrialization process is restricted.
At present, back contact solar cell (as MWT, EWT solar cell) receives everybody extensive concern, its advantage is: because its front does not have main gate line, positive pole and negative pole are all at the back side of cell piece, decrease the shading of cell piece, improve the conversion efficiency of cell piece, simultaneously due to positive pole and negative pole all overleaf, when making assembly, welding can be reduced affect the shading of cell piece, adopt new packaged type can also reduce the series resistance of cell piece simultaneously, reduce the power loss of cell piece.The assembly obtained by above-mentioned back contact solar cell sheet is also back contact solar cell assembly.Such as, ECN company of Holland recently discloses a kind of back contact solar cell assembly of new construction, see Developmentofcost-competitivesolutionsforMWTcellsandmodu les, SNEC8thInternationalPhotovoltaicPowerGenerationConferenc e & Exhibition, 20-22May2014, Shanghai, China.This article discloses the conductive interconnections that back contact solar cell assembly uses conductive backings paper tinsel (conductiveback-sheetfoil) and conducting resinl to realize between back contact battery sheet.Described conductive backings paper tinsel is by copper foil layer and backsheet layer (can be PET-PVF layer) is stacked forms, and the rear-face contact of copper foil layer and MWT battery, copper foil layer is provided with the electric current derived type structure coordinated with MWT battery, its electric current can be derived.Described conductive backings paper tinsel can place multiple MWT battery sheet, form an assembly.
The preparation process of said modules is as follows: be first fixed on by conductive backings paper tinsel on a vacuum carrier, then on conductive backings paper tinsel, arrange adhesive dots (such as adopting the method for printing), the position of adhesive dots and the back electrode structure of MWT battery to be placed match; Then, place one deck perforation EVA layer (perforation on this EVA layer and described adhesive dots one_to_one corresponding, and the height of adhesive dots is greater than the thickness of perforation EVA layer), then place MWT battery sheet, the positive and negative electrode at the cell piece back side is electrically connected with above-mentioned adhesive dots; Then place upper strata EVA layer and skin glass, form a stacked combination, above-mentioned conducting resinl and EVA are solidified in final step, can obtain back contact solar cell assembly.
For the back contact solar cell assembly of said structure, in order to reduce resistance loss, the thickness of copper foil layer, usually more than 10 microns, causes the cost of this product higher here.Therefore, the how resistance loss of coordination component and the cost of Copper Foil, realizes the maximization of income, is that this assembly is badly in need of one of technical problem solved.
Summary of the invention
The object of this invention is to provide a kind of back contact solar cell assembly.
To achieve the above object of the invention, the technical solution used in the present invention is: a kind of back contact solar cell assembly, comprises a conductive backings paper tinsel and is located at a plurality of back contact solar cell sheets on this conductive backings paper tinsel; Described conductive backings paper tinsel is by metal foil layer and backsheet layer is stacked forms;
Described back contact solar cell sheet is less than or equal to 10cm along the length L on its series connection column direction;
The thickness H of described metal foil layer is less than 10 microns;
And the thickness H of described metal foil layer is 1:5000 ~ 1:20000 with the ratio of the length L of described back contact solar cell sheet.
In technique scheme, solar module is that the mode adopting series connection or series and parallel connections to mix by a plurality of battery is formed by connecting, described series connection column direction refers to and electricity adopts series system to connect, and is arranged in the direction of the battery strings of same row or same row.
Feature of the present invention have employed the back contact solar cell sheet that length L is less than 10cm, this solar battery sheet can be the cell piece that normal full wafer is cut by slice process, also can be normal solar battery sheet remaining after full wafer solar battery sheet defective removes flaw part by slice process.
Preferably, described back contact solar cell sheet is 3 ~ 9cm along the length on its series connection column direction.
Preferably, in assembly, the length of each back contact solar cell sheet is identical.
In technique scheme, described back contact solar cell sheet is formed by the cutting of complete back contact solar cell sheet.
Existing conventional solar battery sheet is generally 156 × 156mm, after cutting into slices, can obtain the cell piece that length is less than or equal to 10cm, and its width can be still 156mm.
Preferably, described back contact solar cell sheet by complete back contact solar cell sheet according to 1/2 section ratio cut half back contact solar cell sheet.For the conventional batteries sheet of 156 × 156mm, according to the section ratio of 1/2, obtain the solar battery sheet of 156 × 78mm.
In technique scheme, described metal foil layer is copper foil layer.
Principle of the present invention is: the resistance power loss in back contact solar cell assembly conductive backings=2*A*A*B* ρ * J
mp/ (m*V
mp* W
b), wherein A is the length of cell piece, B is the half of back contact solar cell punching spacing, the sheet resistance of ρ conductive metal foil, the thickness of its value and conductive metal foil is inversely proportional to, and Jmp is maximum functional point current density, and m gets 3 ~ 4, Vmp be in maximum functional point one, place cell piece unit on voltage, W
bbe directly proportional to B, be about the half of B.
Back contact solar cell assembly conductive backings resistance power loss=[4*J can be obtained after conversion
mp/ (m*V
mp)] * A*A* ρ, be namely directly proportional to the length square of cell piece, be inversely proportional to the thickness of conductive metal foil.
Conventional back contact solar cell assembly, A is more than or equal to 15.6cm usually, in order to reach less conductive backings resistance power loss, must get the namely thicker conductive backings thickness of lower ρ (being usually greater than 10um as 16um).A kind of back contact solar cell assembly of the present invention, adopts A to be less than the design of 10cm, such as uses A=7.8cm, makes the resistance power loss of assembly conductive backings sharply be reduced to 1/4 of original design.Meanwhile, in order to reduce the cost of assembly, we can adopt the half of such as original thickness as the thickness of conductive metal foil of the present invention.By the design, the resistance power loss of conductive metal foil can be reduced to original half, and the thickness of conductive metal foil is also reduced to original half simultaneously, achieves synergy simultaneously and falls this two effects.
Because technique scheme is used, the present invention compared with prior art has following advantages:
1. the present invention devises a kind of new back contact solar cell assembly, by the back contact solar cell sheet adopting length to be less than 10cm, reduce the thickness of metal foil layer simultaneously, and the ratio defined between the thickness of metal foil layer and the length of back contact solar cell sheet, the perfect coordination resistance loss of assembly and the consuming cost of Copper Foil, realize the maximization of income; Experiment proves: compared with existing full wafer back contact solar cell sheet, under the prerequisite that silicon chip consumption is identical, Copper Foil use amount of the present invention and resistance loss reduce all greatly, and the power output of assembly promotes greatly, achieve beyond thought technique effect;
2. present invention achieves the utilization again of solar battery sheet defective, also save the use amount of metal forming, reduce cost, thus there is positive realistic meaning;
3. the present invention can well be applicable to existing technique, and be easy to preparation, cost is lower, is suitable for applying.
Embodiment
Below in conjunction with embodiment, the invention will be further described:
Embodiment one
A kind of back contact solar cell assembly, comprises a conductive backings paper tinsel and is located at 8 back contact solar cell sheets on this conductive backings paper tinsel; Described conductive backings paper tinsel is by copper foil layer and backsheet layer is stacked forms;
The size of the solar battery sheet in described assembly is all identical, by complete back contact solar cell sheet (156 × 156mm) according to 1/2 section ratio cut half solar battery sheet, i.e. 156 × 78mm; (namely its length is 78mm)
The thickness H of described copper foil layer is 8 microns;
And the thickness H of described copper foil layer is 1:9750 with the ratio of the length L of described back contact solar cell sheet.
Comparative example one
A kind of back contact solar cell assembly, comprises a conductive backings paper tinsel and is located at 4 back contact solar cell sheets on this conductive backings paper tinsel; Described conductive backings paper tinsel is by copper foil layer and backsheet layer is stacked forms;
The size of the back contact solar cell sheet in described assembly is all identical, is made up of, i.e. 156 × 156mm complete back contact solar cell sheet (156 × 156mm); (namely its length is 156mm)
The thickness H of described copper foil layer is 12 microns;
And the thickness H of described copper foil layer is 1:13000 with the ratio of the length L of described back contact solar cell sheet.
Above-described embodiment and comparative example are done the test of Copper Foil consumption and power output, and do electric performance test, contrast as follows:
| Copper thickness | Pmax | Voc | Isc | FF | Rs | |
| Comparative example one | 16 microns | 260.0 | 37.77 | 8.97 | 76.76% | 0.455 |
| Embodiment one | 8 microns | 265.0 | 37.86 | 8.97 | 78.02% | 0.394 |
As seen from the above table, compared with existing full wafer solar battery sheet (comparative example one), under the prerequisite that silicon chip consumption is identical, Copper Foil consumption of the present invention and resistance loss reduce all greatly, the power output of assembly promotes greatly, achieves beyond thought technique effect.
Claims (6)
1. a back contact solar cell assembly, comprises a conductive backings paper tinsel and is located at a plurality of back contact solar cell sheets on this conductive backings paper tinsel; Described conductive backings paper tinsel is by metal foil layer and backsheet layer is stacked forms; It is characterized in that:
Described back contact solar cell sheet is less than or equal to 10cm along the length L on its series connection column direction;
The thickness H of described metal foil layer is less than 10 microns;
And the thickness H of described metal foil layer is 1:5000 ~ 1:20000 with the ratio of the length L of described back contact solar cell sheet.
2. back contact solar cell assembly according to claim 1, is characterized in that: described back contact solar cell sheet is 3 ~ 9cm along the length on its series connection column direction.
3. back contact solar cell assembly according to claim 1, is characterized in that: in assembly, the length of each back contact solar cell sheet is identical.
4. back contact solar cell assembly according to claim 1, is characterized in that: described back contact solar cell sheet is formed by the cutting of complete back contact solar cell sheet.
5. back contact solar cell assembly according to claim 4, is characterized in that: described back contact solar cell sheet by complete back contact solar cell sheet according to 1/2 section ratio cut half back contact solar cell sheet.
6. back contact solar cell assembly according to claim 1, is characterized in that: described metal foil layer is copper foil layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510381207.2A CN105047731B (en) | 2015-07-02 | 2015-07-02 | A kind of back contact solar cell component |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510381207.2A CN105047731B (en) | 2015-07-02 | 2015-07-02 | A kind of back contact solar cell component |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105047731A true CN105047731A (en) | 2015-11-11 |
| CN105047731B CN105047731B (en) | 2017-12-22 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510381207.2A Active CN105047731B (en) | 2015-07-02 | 2015-07-02 | A kind of back contact solar cell component |
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| Country | Link |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103646981A (en) * | 2013-12-24 | 2014-03-19 | 苏州阿特斯阳光电力科技有限公司 | Embossing solder strip used for back contact solar cell component and preparation method of component |
| US20140338739A1 (en) * | 2011-10-31 | 2014-11-20 | E I Du Pont De Nemours And Company | Integrated back-sheet for back contact photovoltaic module |
| US20150090314A1 (en) * | 2013-01-11 | 2015-04-02 | Silevo, Inc. | High efficiency solar panel |
| CN104659136A (en) * | 2015-03-09 | 2015-05-27 | 普乐新能源（蚌埠）有限公司 | High-voltage back-contact solar component |
-
2015
- 2015-07-02 CN CN201510381207.2A patent/CN105047731B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140338739A1 (en) * | 2011-10-31 | 2014-11-20 | E I Du Pont De Nemours And Company | Integrated back-sheet for back contact photovoltaic module |
| US20150090314A1 (en) * | 2013-01-11 | 2015-04-02 | Silevo, Inc. | High efficiency solar panel |
| CN103646981A (en) * | 2013-12-24 | 2014-03-19 | 苏州阿特斯阳光电力科技有限公司 | Embossing solder strip used for back contact solar cell component and preparation method of component |
| CN104659136A (en) * | 2015-03-09 | 2015-05-27 | 普乐新能源（蚌埠）有限公司 | High-voltage back-contact solar component |
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| Publication number | Publication date |
|---|---|
| CN105047731B (en) | 2017-12-22 |
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Address after: No. 199, deer mountain road, Suzhou high tech Zone, Jiangsu Province Patentee after: CSI Cells Co.,Ltd. Patentee after: Funing atlas sunshine Power Technology Co., Ltd Address before: No. 199, deer mountain road, Suzhou high tech Zone, Jiangsu Province Patentee before: CSI Cells Co.,Ltd. Patentee before: CSI-GCL SOLAR MANUFACTURING (YANCHENG) Co.,Ltd. |
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