CN102130197A - Light-reflecting low-resistance crystalline silicon solar cell assembly and connection welding belt thereof - Google Patents
Light-reflecting low-resistance crystalline silicon solar cell assembly and connection welding belt thereof Download PDFInfo
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- CN102130197A CN102130197A CN 201010620125 CN201010620125A CN102130197A CN 102130197 A CN102130197 A CN 102130197A CN 201010620125 CN201010620125 CN 201010620125 CN 201010620125 A CN201010620125 A CN 201010620125A CN 102130197 A CN102130197 A CN 102130197A
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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 invention relates to a light-reflecting low-resistance crystalline silicon solar cell assembly, which is provided with solar cells; main grid lines of electrodes on the front sides of the solar cells consist of wide grid lines and narrow grid lines, and a prismatic light reflecting layer is arranged on the narrow grid lines; the width of grid lines in a light reflecting section is smaller than that of grid lines in a welding section; and the prismatic light reflecting layer is a copper base material with a prismatic section, a silver coating is covered on the copper base material, and the copper base material is pressed on bottom grid lines at the bottom of the copper base material by conducting elargol. The invention relates to a connection welding belt for serially connecting the solar cells in the light-reflecting low-resistance crystalline silicon solar cell assembly, which comprises more than two front welding sections and more than two back welding sections, wherein the width of the front welding sections is larger than that of the back welding sections. By the light-reflecting low-resistance crystalline silicon solar cell assembly and the connection welding belt thereof, the optical loss and resistance loss of the solar cell assembly can be reduced simultaneously, the optical loss can be reduced by 2 to 4 percent, and the power of the solar cell assembly can be improved by 4 to 6 percent.
Description
Technical field
The present invention relates to the solar module technical field, especially a kind of reflective and low-resistance crystalline silicon solar cell modules and be connected welding.
Background technology
Crystalline silicon solar cell modules is generally formed by the protective material encapsulation by tens of solar cell series connection backs.Improve that solar battery assembly efficiency is main several approach: promote battery efficiency; Reduce the assembly optical loss; Reduce the connection resistance of solar cell.Promote the battery efficiency aspect, numerous scientific research personnel improve the absorption of battery to spectrum itself from aspects such as selective emitter, backplate, heterojunction batteries, reduce the loss of cell resistance to power; On the other hand, comprise the optical property at glass, EVA, high saturating silica gel, the back side etc. from the lifting subassembly material, optimize electric properties such as connecting welding, conductive tape, terminal box, by-pass diode improve the research work of component efficiency also more see in patent and document report.
As shown in Figure 1, common solar cell front electrode grid line generally is made up of 2～4 main grid lines and 40～100 thin grid lines, and linear welding one end is welded on the battery front side main grid line, and an end is welded in another cell backside can realize connection between the battery.If encrypt the series resistance that grid line reduces battery and assembly by widening, but the shielded area increase will bring more optical losss.
The back side contact battery of Sunpower company adopts the back side to bury the grid line technology underground, and reduce the face-up optical loss and reduced series resistance simultaneously, but the technology relative complex, cost is higher; Reduce the optical loss aspect, Asberg Ingma etc. has proposed little V-type groove design, 110～130 ° of angles, outermost reflector uses Ag, Al, Au or reflective polymer material, the effective light-reflecting portion of V-type is positioned on battery sheet gap and the battery main grid line, and reflective welding links to each other with the cell back face by the plane feeler at two ends, the V-type left and right sides, reaches to reduce assembly light loss purpose, but this design makes battery be welded into a difficult problem, is difficult for reducing battery and connects resistance.
Summary of the invention
The technical problem to be solved in the present invention is: overcome the deficiencies in the prior art, a kind of reflective and low-resistance crystalline silicon solar cell modules is provided and is connected welding, reduce solar module light loss and ohmic loss simultaneously.
The technical solution adopted for the present invention to solve the technical problems is: a kind of reflective and low-resistance crystalline silicon solar cell modules, has solar battery sheet, solar battery sheet front electrode main grid line is made up of wide section grid line and narrow section grid line, disposes the prismatic reflector layer on the narrow section grid line.
Further, described wide section grid line is the welding section grid line, and described narrow section grid line is reflective section grid line, and the width of reflective section grid line is less than the width of welding section grid line.
Further, the copper base material that described prismatic reflector layer is the double-wedge section covers silver coating on the copper base material, and the copper base material is pressed together on the bottom gate line of copper base material bottom by conductive silver glue.
Further, described welding section grid line is positioned at solar cell front edge place, and welding section grid line width is 2～5mm, and described reflective section grid line is positioned at the solar cell middle part, and the width of reflective section grid line is 0.1～0.8mm.
Further, the quantity of described front electrode main grid line is 3～10.For example, the quantity of front electrode main grid line is 5.Front electrode main grid line quantity has reduced the series resistance of assembly to a certain extent than the increase of conventional batteries.
Further, described back of solar cell has backplate main grid line, and backplate main grid line and be connected with wide welding section and is extended to the narrow grid section at middle part, the back side by the wide welding section corresponding with wide section grid line.
The width of the narrow grid section of backplate main grid line has increased back of the body field area less than the width of wide welding section, has further improved battery component efficient.
A kind of being used for is connected welding with what described reflective and the solar cell of low-resistance crystalline silicon solar cell modules were connected mutually, have plural front welding section and plural back side welding section, the width of described front welding section is greater than the width of back side welding section, and adjacent front welding section interconnects.Described single front welding section width is 2～5mm, and described single back side welding section width is 0.1～0.8mm.
The front welding section that connects welding interconnects, and a plurality of pads itself interconnect by single welding and are connected in parallel, and have improved connective stability, also makes that welding processing is convenient simultaneously.
A kind of being used for is connected welding with what described a kind of reflective and the solar cell of low-resistance crystalline silicon solar cell modules were connected mutually, have more than one front welding section and more than one back side welding section, the width of described front welding section is greater than the width of back side welding section, and adjacent front welding section is separated from each other.Described single front welding section width is 2～5mm, and described single back side welding section width is 0.1～0.8mm.
The front welding section of the connection welding of battery strings coupling is wide, and it is little to guarantee to connect resistance, and back side welding section is narrow, the use of having saved the welding materials used and having saved battery conductive silver slurry.
The invention has the beneficial effects as follows: after light arrives reflective section grid line surface by solar module glass, EVA encapsulated layer, reflection is through the EVA encapsulated layer, form total reflection at glass and air surface, secondary reflect to battery surface again, absorbed by battery, convert electric energy to, reduced optical loss, improved battery efficiency.The present invention has increased the conductive silver glue process for pressing on the copper base material is pressed together on copper base material bottom by conductive silver glue the bottom gate line.The narrowed width of reflective section grid line of the present invention, the width of welding section grid line broadens, and effectively reduces the series resistance of battery, and the copper base material cross section in reflective section grid line is a prismatic, thereby constitutes big depth-width ratio cross section, has further reduced the series resistance of battery.The present invention can reduce solar module light loss and ohmic loss simultaneously, can reduce optical loss 2～4%, and solar module power can promote 4～6%.
Description of drawings
The present invention is further described below in conjunction with accompanying drawing.
Fig. 1 is the structural representation of solar cell in the prior art;
Fig. 2 is the structural representation of solar cell among the present invention;
Fig. 3 is the schematic cross-section of reflective section grid line among the present invention;
Fig. 4 is that the reflective section grid line in solar module encapsulation back partly reduces the light loss schematic diagram among the present invention;
Fig. 5 is the structural representation that connects the embodiment one of welding among the present invention;
Fig. 6 is the structural representation that connects the embodiment two of welding among the present invention;
Fig. 7 is a schematic rear view of the present invention;
Wherein: 1. reflective section grid line, 2. welding section grid line, 3. copper base material, 4. silver coating, 5. conductive silver glue, 6. bottom gate line.
Embodiment
The invention will be further described in conjunction with specific embodiments now, and following examples are intended to illustrate the present invention rather than limitation of the invention further.
Shown in Figure 3 as Fig. 2, a kind of reflective and low-resistance crystalline silicon solar cell modules, has solar cell, the solar cell front has front electrode main grid line, the quantity of front electrode main grid line is 5, front electrode main grid line is made up of reflective section grid line 1 and welding section grid line 2, the width of reflective section grid line 1 is less than the width of welding section grid line 2, reflective section grid line 1 has the copper base material 3 of double-wedge section, the prismatic reflector layer is the copper base material of double-wedge section, cover silver coating 4 on the copper base material 3, copper base material 3 is pressed together on the bottom gate line 6 of copper base material 3 bottoms by conductive silver glue.
Welding section grid line 2 is positioned at solar cell front edge place, and welding section grid line width is 2～5mm, and reflective section grid line 1 is positioned at the solar cell middle part, and the width of reflective section grid line is 0.1～0.8mm.The narrowed width of reflective section grid line 1, the width of welding section grid line 2 broadens, and effectively reduces the series resistance of battery, and copper base material 3 cross sections in reflective section grid line 1 are prismatic, thereby constitute big depth-width ratio cross section, have further reduced the series resistance of battery.
As shown in Figure 7, back of solar cell has backplate main grid line, and backplate main grid line and be connected with wide welding section and is extended to the narrow grid section at middle part, the back side by the wide welding section corresponding with wide section grid line.
As shown in Figure 4, after light arrives reflective section grid line surface by solar module glass, EVA encapsulated layer, reflection is through the EVA encapsulated layer, form total reflection at glass and air surface, secondary reflect to battery surface again, absorbed, convert electric energy to by battery, reduce optical loss, improved battery efficiency.
As shown in Figure 5, a kind of being used for is connected welding with what reflective and the solar cell of low-resistance crystalline silicon solar cell modules were connected mutually, embodiment one: have 5 front welding sections and 5 back side welding sections, the width of front welding section is greater than the width of back side welding section, and adjacent front welding section interconnects.Single front welding section width is that the described single back side of 2～5mm welding section width is 0.1～0.8mm.The front welding section that connects welding interconnects, and a plurality of pads itself interconnect by single welding and are connected in parallel, and have improved connective stability, also makes that welding processing is convenient simultaneously.
As shown in Figure 6, a kind of being used for is connected welding with what reflective and the solar cell of low-resistance crystalline silicon solar cell modules were connected mutually, embodiment two: have 5 front welding sections and 5 back side welding sections, the width of front welding section is greater than the width of back side welding section, and adjacent front welding section is separated from each other.Single front welding section width is 2～5mm, and single back side welding section width is 0.1～0.8mm.
The production process of the solar module among the present invention is: after P type polysilicon silicon chip plates antireflective film through cleaning, sour making herbs into wool, phosphorous diffusion system PN junction, PECVD, and printing front electrode main grid line and aluminium back of the body field, and sintering forms good electrical contact.Superimposed conductive silver glue 5 on the bottom gate line 6 of reflective section grid line 1 again, the prismatic copper base material 3 that will have a silver coating 4 is pressed together on the conductive silver glue 5 and solidifies, and has the solar cell of reflective section grid line 1 from formation.Adopt and connect welding, the welding section of the front electrode main grid line of solar cell and the middle part section of dwindling of another back of solar cell electrode main grid line are together in series mutually, and the some of connecting the as required solar cells and the back of setting type are made into the solar module that can be used for outdoor generating with encapsulating materials such as EVA, glass.
Eventually the above, the present invention can reduce solar module light loss and ohmic loss simultaneously, can reduce optical loss 2～4%, solar module power can promote 4～6%.
With above-mentioned foundation desirable embodiment of the present invention is enlightenment, and by above-mentioned description, the related work personnel can carry out various change and modification fully in the scope that does not depart from this invention technological thought.The technical scope of this invention is not limited to the content on the specification, must determine its technical scope according to the claim scope.
Claims (10)
1. reflective and low-resistance crystalline silicon solar cell modules, it is characterized in that: have solar battery sheet, solar battery sheet front electrode main grid line is made up of wide section grid line and narrow section grid line, disposes the prismatic reflector layer on the narrow section grid line.
2. a kind of reflective and low-resistance crystalline silicon solar cell modules according to claim 1, it is characterized in that: described wide section grid line is the welding section grid line, described narrow section grid line is reflective section grid line, and the width of reflective section grid line is less than the width of welding section grid line.
3. a kind of reflective and low-resistance crystalline silicon solar cell modules according to claim 1, it is characterized in that: the copper base material that described prismatic reflector layer is the double-wedge section, cover silver coating on the copper base material, the copper base material is pressed together on the bottom gate line of copper base material bottom by conductive silver glue.
4. a kind of reflective and low-resistance crystalline silicon solar cell modules according to claim 2, it is characterized in that: described welding section grid line is positioned at solar cell front edge place, welding section grid line width is 2～5mm, described reflective section grid line is positioned at the solar cell middle part, and the width of reflective section grid line is 0.1～0.8mm.
5. a kind of reflective and low-resistance crystalline silicon solar cell modules according to claim 1, it is characterized in that: the quantity of described front electrode main grid line is 3～10.
6. a kind of reflective and low-resistance crystalline silicon solar cell modules according to claim 1, it is characterized in that: described back of solar cell has backplate main grid line, and backplate main grid line and be connected with wide welding section and is extended to the narrow grid section at middle part, the back side by the wide welding section corresponding with wide section grid line.
7. one kind is used for being connected welding with what claim 1～6 each described a kind of reflective and solar cell of low-resistance crystalline silicon solar cell modules were connected mutually, it is characterized in that: have plural front welding section and plural back side welding section, the width of described front welding section is greater than the width of back side welding section, and adjacent front welding section interconnects.
8. connection welding according to claim 7 is characterized in that: described single front welding section width is 2～5mm, and described single back side welding section width is 0.1～0.8mm.
9. one kind is used for being connected welding with what claim 1～6 each described a kind of reflective and solar cell of low-resistance crystalline silicon solar cell modules were connected mutually, it is characterized in that: have more than one front welding section and more than one back side welding section, the width of described front welding section is greater than the width of back side welding section, and adjacent front welding section is separated from each other.
10. connection welding according to claim 9 is characterized in that: described single front welding section width is 2～5mm, and described single back side welding section width is 0.1～0.8mm.
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| CN 201010620125 CN102130197A (en) | 2010-12-31 | 2010-12-31 | Light-reflecting low-resistance crystalline silicon solar cell assembly and connection welding belt thereof |
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| CN 201010620125 CN102130197A (en) | 2010-12-31 | 2010-12-31 | Light-reflecting low-resistance crystalline silicon solar cell assembly and connection welding belt thereof |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102610668A (en) * | 2012-03-15 | 2012-07-25 | 晶澳（扬州）太阳能科技有限公司 | Improved electrode structure of solar cell |
| CN103000710A (en) * | 2012-12-24 | 2013-03-27 | 英利能源（中国）有限公司 | Solar cell |
| WO2013091476A1 (en) * | 2011-12-21 | 2013-06-27 | 中电电气（南京）光伏有限公司 | Crystalline silicon solar cell |
| CN103208551A (en) * | 2012-01-13 | 2013-07-17 | 比亚迪股份有限公司 | Solar cell module |
| WO2013143480A1 (en) * | 2012-03-28 | 2013-10-03 | Shenzhen Byd Auto R&D Company Limited | Solar battery assembly |
| WO2013143478A1 (en) * | 2012-03-28 | 2013-10-03 | Shenzhen Byd Auto R&D Company Limited | Solar battery assembly |
| CN103382327A (en) * | 2012-05-02 | 2013-11-06 | 比亚迪股份有限公司 | Copper ink for solar cell, preparation method of the copper ink, manufacturing method of solar cell main grid, and solar cell module |
| CN103400870A (en) * | 2013-08-02 | 2013-11-20 | 浙江正泰太阳能科技有限公司 | Solar cell, electrode pattern design thereof and solar cell assembly |
| CN107195564A (en) * | 2017-07-05 | 2017-09-22 | 苏州阿特斯阳光电力科技有限公司 | The assay method of photovoltaic welding belt reflection coefficient and the I for determining different welding componentsSCThe method of difference |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2013091476A1 (en) * | 2011-12-21 | 2013-06-27 | 中电电气（南京）光伏有限公司 | Crystalline silicon solar cell |
| CN103208551A (en) * | 2012-01-13 | 2013-07-17 | 比亚迪股份有限公司 | Solar cell module |
| CN103208551B (en) * | 2012-01-13 | 2017-07-04 | 比亚迪股份有限公司 | A kind of solar cell module |
| CN102610668A (en) * | 2012-03-15 | 2012-07-25 | 晶澳（扬州）太阳能科技有限公司 | Improved electrode structure of solar cell |
| WO2013143480A1 (en) * | 2012-03-28 | 2013-10-03 | Shenzhen Byd Auto R&D Company Limited | Solar battery assembly |
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| CN103382327A (en) * | 2012-05-02 | 2013-11-06 | 比亚迪股份有限公司 | Copper ink for solar cell, preparation method of the copper ink, manufacturing method of solar cell main grid, and solar cell module |
| CN103382327B (en) * | 2012-05-02 | 2015-11-25 | 比亚迪股份有限公司 | The manufacture method of a kind of copper ink used for solar batteries and preparation method thereof, a kind of solar cell main grid and solar module |
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| CN103400870A (en) * | 2013-08-02 | 2013-11-20 | 浙江正泰太阳能科技有限公司 | Solar cell, electrode pattern design thereof and solar cell assembly |
| CN107195564A (en) * | 2017-07-05 | 2017-09-22 | 苏州阿特斯阳光电力科技有限公司 | The assay method of photovoltaic welding belt reflection coefficient and the I for determining different welding componentsSCThe method of difference |
| CN107195564B (en) * | 2017-07-05 | 2019-09-20 | 苏州阿特斯阳光电力科技有限公司 | The measuring method of photovoltaic welding belt reflection coefficient and the I of the different welding components of measurementSCThe method of difference |
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Application publication date: 20110720 |