CN201859886U - Solar battery, screen and solar battery component thereof - Google Patents
Solar battery, screen and solar battery component thereof Download PDFInfo
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- CN201859886U CN201859886U CN201020201844XU CN201020201844U CN201859886U CN 201859886 U CN201859886 U CN 201859886U CN 201020201844X U CN201020201844X U CN 201020201844XU CN 201020201844 U CN201020201844 U CN 201020201844U CN 201859886 U CN201859886 U CN 201859886U
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- 239000000758 substrate Substances 0.000 claims abstract description 28
- 239000000203 mixture Substances 0.000 claims abstract description 9
- 238000007650 screen-printing Methods 0.000 claims abstract description 7
- 239000002002 slurry Substances 0.000 claims description 32
- 238000012360 testing method Methods 0.000 claims description 29
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 230000002265 prevention Effects 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 abstract description 12
- 229910052710 silicon Inorganic materials 0.000 abstract description 10
- 239000010703 silicon Substances 0.000 abstract description 10
- 229910052751 metal Inorganic materials 0.000 abstract description 9
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- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 10
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 9
- 238000007639 printing Methods 0.000 description 9
- 229910052709 silver Inorganic materials 0.000 description 9
- 239000004332 silver Substances 0.000 description 9
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- 229910000648 terne Inorganic materials 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 229910021419 crystalline silicon Inorganic materials 0.000 description 2
- 238000011161 development Methods 0.000 description 2
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- 229910000679 solder Inorganic materials 0.000 description 2
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- 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
- H01L31/04—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 adapted as photovoltaic [PV] conversion devices
- H01L31/042—PV modules or arrays of single PV cells
- H01L31/05—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells
- H01L31/0504—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells specially adapted for series or parallel connection of solar cells in a module
- H01L31/0508—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells specially adapted for series or parallel connection of solar cells in a module the interconnection means having a particular shape
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- 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
- H01L31/022433—Particular geometry of the grid contacts
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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
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- General Physics & Mathematics (AREA)
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Abstract
The utility model discloses a solar battery, a screen and a solar battery component thereof, which belong to the field of photovoltaic technology. The solar battery comprises a battery substrate and an electrode arranged on the substrate; the electrode comprises a main grid line; a line body area of the main grid line adopts a structure comprising at least one fine grid line, so as to reduce the contact area of the main grid line and the substrate; the screen is used for screen printing to manufacture the electrode of the solar battery; meshes used for composition to from the main grid line of the electrode is arranged on the screen; and the solar battery component comprises a plurality of the solar batteries. The solar battery and the solar battery component have the advantages that the costs are low, as a compound area between a metal electrode and silicon in the battery structure is reduced, the conversion efficiency is improved, the output power of the component is increased, and in addition, the reliability is good after an interconnector is welded with a battery plate.
Description
Technical field
The utility model belongs to the photovoltaic technology field, is specifically related to solar cell, relate in particular to a kind of solar cell electrode structure, be used to the solar module making the half tone of this electrode and comprise a plurality of these solar cells.
Background technology
In view of the finiteness of conventional energy resource supply and the increase of environmental protection pressure, many in the world countries have started the upsurge of development and use solar energy and regenerative resource at present, solar utilization technique has obtained fast development, wherein utilizes utilization that semi-conductive photovoltaic effect changes solar energy into electric energy more and more widely.And solar cell is exactly that wherein general to be used to solar energy converting be the device of electric energy.In actual applications, generally be as basic applying unit with the battery component that forms by the series connection of a plurality of solar cells.
Solar cell is as the elementary cell of solar module, and the inside photogenerated current that (as crystalline silicon) produces because of shining upon in its body need be collected and it is compiled and draw by the electrode of battery.Wherein solar cell comprises front electrode and backplate, and wherein front electrode is in the face that is shone by sunlight.With the front electrode is example, front electrode generally includes the main grid line (or being referred to as the main grid electrode) and the secondary grid line that are arranged on the solar cell substrate and (or is referred to as secondary gate electrode, inferior grid line), wherein secondary grid line mainly plays collected current, and the main grid line mainly plays a part the electric current that secondary grid line is collected is compiled, also when being connected to form solar module by interconnector, a plurality of solar cells are used as the connection matrix of interconnector simultaneously, promptly in general, interconnector is by welding or otherwise be connected and then realize with main grid line (the main grid line of positive electrode or the main grid line of backplate) series connection of a plurality of batteries.
At present, it is high that the subject matter that solar power generation is applied is that cost of electricity-generating is compared traditional thermal power generation, so, reducing the production cost of solar cell, the conversion efficiency that improves battery becomes the direction of effort in the industry.
The electrode cost of manufacture that reduces solar cell is to reduce a striving direction of solar cell cost in the industry.In the prior art, the electrode of solar cell is realized by the screen printing technique composition of extensive use usually, that is, be imprinted on the metal paste composition on the monocrystalline silicon piece cell substrate that forms p-n junction, form electrode by sintering again.Usually, adopt the silver slurry to form the slurry of electrode as silk screen printing.Adopt the silver slurry to have strong adhesion, good conductivity, electrode surface even compact, good, the battery conversion efficiency advantages of higher of solderability, still,, increased the cost of solar cell owing to the characteristic that costs an arm and a leg of silver metal.
Figure 1 shows that the structural representation of the solar cell of prior art, Figure 2 shows that the structural representation in the A-A cross section of solar cell shown in Figure 1.As depicted in figs. 1 and 2, main grid line 11 and secondary grid line 13 have been formed at the last composition of the cell substrate 17 (having formed the crystalline silicon of p-n junction) of solar cell 10, secondary grid line 13 generally engages with 11 square crossings of main grid line, the area of main grid line and highly also obvious respectively greater than or be higher than the area of secondary grid line and highly.
For reducing cost, usually consider in the prior art to adopt the live width that reduces the main grid line or the use amount that the silver slurry is reduced in some zones of directly not printing slurry is set on the main grid line, but those skilled in the art also recognize, though the slurry area coverage that reduces front electrode can reduce the slurry use amount of front electrode, can save some costs to a certain extent, but, when main grid line live width and line height reduce, because the sectional area of series resistance and main grid line is the relation of being inversely proportional to, so its series resistance also must increase, this can cause the solar cell conversion efficiency to reduce, finally can cause the power output of solar module to reduce, can lose more than gain on the contrary.
So in some present designs, though consider by some hollow out zones are set on the main grid line and reduce the use of slurry, reduce the compound area between metal electrode and the silicon (as Ag-Si), the bending that also can reduce battery to a certain extent is (because the thermal coefficient of expansion of metal and silicon is different, after the sintering cooling, the battery bending tablet will appear, the slurry use amount is many more, deflection also can be big more), but when design, tending to consider the battery efficiency that the increase of series resistance causes descends, the area in these hollow out zones can be very not big, and the gap between the hollow out zone also can be very little, in the time of so also can be after the slurry printing,, cover the zone of not printing slurry by the flowability of slurry self, to guarantee that series resistance is not subjected to big influence (because slurry is mobile, vacancy section is filled the silver slurry equally, and in fact the cross-sectional area of main grid line does not obviously reduce).So in this design, the contact area of electrode and silicon substrate does not reduce, employed amount of slurry does not have especially significantly yet and reduces.Simultaneously, because the thermal coefficient of expansion of silver electrode main grid line and solar cell substrate silicon is inconsistent, the large tracts of land and the high characteristics of line of comprehensive main grid line are in the follow-up technical process that is welded to connect interconnector, big thermal stress be can produce, thereby fragment and the latent phenomenon of splitting easily produced in the welding process.
In view of this, be necessary to propose a kind of new structure, in the cost of manufacture of the electrode that reduces solar cell significantly, can improve the power output of solar module.
The utility model content
One of the purpose of this utility model is, significantly reduce solar cell electrode cost and avoid front electrode and the welding process of interconnector in easily produce fragment and latent splitting.
Another purpose of the present utility model is to improve the conversion efficiency of solar cell and solar module.
For reaching the purpose of this utility model, according to an aspect of the present utility model, a kind of solar cell is provided, comprise cell substrate and be arranged on electrode on the substrate, described electrode comprises the main grid line, wherein, the line tagma of described main grid line is configured to comprise that the structure of at least one thin grid line is to reduce the contact area of main grid line and substrate.
As the preferred technique scheme, described main grid line comprises the first thin grid line and the second thin grid line on the dual-side edge that lays respectively at the line tagma.
As the preferred technique scheme, the thin grid line in the line tagma of described main grid line is one, and described thin grid line is set to be the lines of broken line type, and it comprises that multistage is arranged in a crossed manner successively in the thin grid line on dual-side edge, line tagma respectively.The line tagma of described main grid line also comprises at least one test point, and the described thin grid line that is broken line type is divided into multistage by described test point, and the two ends of every section described thin grid line are electrically connected with described test point.The two ends of every section described thin grid line can online tagma the same side be electrically connected with described test point; The two ends of every section described thin grid line also can online tagma not homonymy be electrically connected with described test point.
As preferably, the live width of described thin grid line is 0.1 to 0.5 millimeter.
As preferably, the described first thin grid line and the second thin grid line are parallel to each other and the width in described line tagma is 1.2 to 2 millimeters.
According to an embodiment of solar cell provided by the utility model, the line tagma of described main grid line also comprises at least one test point, and described test point is electrically connected with described thin grid line.
Described test point can be configured to rectangle, also can be configured to comprise many lines.
According to an embodiment of solar cell provided by the utility model, described main grid line also comprises at least one the end of a thread district that is positioned at line tagma head.Described the end of a thread district can be configured to similar leg-of-mutton pointed shape.Described the end of a thread district can be provided with the hollow out zone.
As preferably, described hollow out zone is circular, and its diameter is 50 to 400 microns.
As preferably, the width of the main grid line in described the end of a thread district is identical with the width of the main grid line in described line tagma.
According to another aspect of the present utility model, the utility model provides a kind of half tone that the electrode of the above solar cell is made in silk screen printing that is used for, and described half tone is provided with and is used for the pattern main grid line, that make the mesh that slurry passes through that composition forms described electrode; Wherein, the line tagma of described main grid line is configured to comprise that the structure of at least one thin grid line is to reduce the contact area of main grid line and cell substrate.
As the preferred technique scheme, described main grid line comprises the first thin grid line and the second thin grid line on the dual-side edge that lays respectively at the line tagma.
As the preferred technique scheme, it is characterized in that the thin grid line in the line tagma of described main grid line is one, described thin grid line is set to be the lines of broken line type.
As preferably, the live width of described thin grid line is 0.1 to 0.5 millimeter.
As preferably, the width in the line tagma of described main grid line is 1.2 to 2 millimeters.
As the preferred technique scheme, described half tone also comprises pattern the end of a thread district, that make the mesh that slurry passes through that is used for forming corresponding to composition the main grid line, wherein is provided with the zone that a plurality of prevention slurries pass through.
According to one side more of the present utility model, the utility model provides a kind of solar module, it is characterized in that, described solar module comprises a plurality of above-described solar cells, connect by interconnector between the described solar cell, described interconnector is connected on the main grid line of electrode of described solar cell.
Described interconnector is to be connected with the main grid line of the electrode of described solar cell by the mode that bonds or weld, and described interconnector covers on the whole main grid line.
Technique effect of the present utility model is, the utility model is configured to comprise that by the line tagma of main grid line the structure of at least one thin grid line is significantly to reduce the contact area of main grid line and substrate, the sectional area of main grid line is reduced too, therefore broken through the thought that the sectional area of the contact area of original main grid line and substrate and main grid line can not reduce, significantly reduce the area coverage of slurry use amount and slurry, reduced the cost of solar cell.In addition, under the situation that the slurry printing area significantly reduces, can reduce on the one hand compound between metal electrode and the silicon, improve the conversion efficiency of battery and assembly; On the other hand, after the interconnector welding, can reduce the stress (stress be owing to the thermal expansion of silver electrode main grid line and solar cell substrate silicon and constriction coefficient inconsistent causes) of main grid line when the solder interconnections bar, thereby, be easy to fragment phenomenon and the latent phenomenon of splitting of avoiding welding process to produce.
As for because the problem that the battery efficiency that increase caused of the series resistance that the sectional area of main grid line reduces to cause reduces, because one of them effect of main grid line is to be used for being welded to connect interconnector to form solar module, usually the sectional area of interconnector is more much bigger than the sectional area of main grid line, differs usually to surpass more than 10 times; And can prove by sample plot that interconnector is less with contact resistance (for example contacting by the terne metal) resistance of main grid line, very little to the overall electrical resistance influence.Therefore, consider from the whole angle of solar module, even the series resistance of main grid line increases, and the interconnector that is welded to connect on the main grid line is the main current path in the assembly, the series resistance that is welded to connect on the interconnector of back is not significantly increased, therefore, it can't influence the conversion efficiency of solar module, also is that the increase of series resistance of main grid line does not bring apparent in view negative interaction on the whole from solar module.The solar module of this utility model has the advantage that cost is low, conversion efficiency is high, power output increases, reliability is high.
Description of drawings
Fig. 1 is the structural representation of the solar cell of prior art;
Fig. 2 is the structural representation in the A-A cross section of solar cell shown in Figure 1;
Fig. 3 is the planar structure schematic diagram according to the solar cell of the utility model embodiment;
Fig. 4 is the structural representation in the B-B cross section of solar cell shown in Figure 3;
Fig. 5 is the planar structure schematic diagram according to the solar cell of another embodiment provided by the utility model;
Fig. 6 is the planar structure schematic diagram according to the solar cell of an embodiment more provided by the utility model;
Fig. 7 is the structural representation according to the end of a thread district of the main grid line of the utility model solar cell shown in Figure 3;
Fig. 8 is the another kind of structural representation according to the end of a thread district of the main grid line of the utility model solar cell shown in Figure 3.
Embodiment
What introduce below is a plurality of some in may embodiment of the present utility model, aims to provide basic understanding of the present utility model, is not intended to confirm key of the present utility model or conclusive key element or limits claimed scope.In the accompanying drawings, for the sake of clarity, might amplify the thickness of layer or the area in zone, but should not be considered to the proportionate relationship that strictness has reflected physical dimension as schematic diagram.In the accompanying drawing, identical label refers to identical structure division, therefore will omit description of them.
Herein orientation terms such as the upper and lower, left and right of mentioning, centre, level define with respect to the orientation of the solar cell of anticipating shown in the accompanying drawing, they are relative notions, can correspondingly change according to different modes that solar cell used, places.
Figure 3 shows that planar structure schematic diagram according to the solar cell of the utility model embodiment.As shown in Figure 3, on the one side that is subjected to solar light irradiation of the cell substrate 17 of solar cell 30, formed front electrode, front electrode comprises main grid line 31 and secondary grid line 33, substrate 17 is for forming the crystal silicon chip of p-n junction, and the concrete material type of cell substrate 17 and concrete structure are not limited by the utility model.In this was embodiment illustrated in fig. 3, many secondary grid line 33 left and right directions were arranged in parallel and engage with two main grid line 31 square crossings.The concrete quantity of secondary grid line 33 and main grid line 31 and the arrangement mode of main grid line 31 and secondary grid line 33 are not subjected to the restriction of the utility model embodiment.
Figure 4 shows that the structural representation in the B-B cross section of solar cell shown in Figure 3.In conjunction with Fig. 3 and shown in Figure 4, main grid line 31 comprises line tagma 31a, the structure that is configured to comprise some thin grid lines of main grid line 31, in this embodiment, the line tagma 31a of main grid line 31 comprises two thin grid lines, promptly be respectively the first thin grid line 311 and the second thin grid line 312 on the dual-side edge that online tagma 31a is set, and the first thin grid line 311 and the second thin grid line 312 are for be arrangeding in parallel.In addition, the live width scope of the first thin grid line 311 and the second thin grid line 312 is 0.1 to 0.5 millimeter, and the width in line tagma (width in line tagma be the right and left along between distance, being the W shown in Fig. 4) scope is 1.2 to 2 millimeters, therefore, the contact area of line tagma and substrate reduces greatly, and the white space between the first thin grid line 311 and the second thin grid line 312 all is the zone of depositing silver electrode not.Many secondary grid lines 33 on the battery directly are communicated with (conducting) with thin grid line 311 and 312, and therefore, thin grid line 311 and 312 can realize that equally the electric current of secondary grid line compiles.When forming solar module with this solar cell 30, thin grid line 311 and 312 also is used to be welded to connect interconnector in addition, so that a plurality of solar cell series connection are connected to form solar module.Need to prove whether the live width of the first thin grid line 311 and the second thin grid line 312 equates not limited by the utility model embodiment.
Continue as shown in Figure 3, the needs of battery testing also comprise at least one test point 315 in the line tagma of main grid line 31 for convenience, and test point 315 is electrically connected with main grid line 31, in this embodiment, test point 315 is arranged between the first thin grid line 311 and the second thin grid line 312.Wherein test point can or be the test block that comprises many fine rules for the essentially rectangular shape, the width of described fine rule is 0.1 to 1 millimeter, the concrete shape of test point 315 is not limited by the utility model embodiment, it only provides measurement point for detector probe, and its concrete shape can design according to the shape of detector probe.
Figure 5 shows that planar structure schematic diagram according to the solar cell of another embodiment provided by the utility model.As shown in Figure 5, the thin grid line 411 that is configured to a broken line type setting of the line tagma 41a of the main grid line 41 of the front electrode of the solar cell 40 in the present embodiment, test point 415 is arranged at the line tagma 41a of main grid line 41 and is electrically connected with thin grid line 411, thin grid line 411 comprises that multistage is arranged in a crossed manner successively in the thin grid line of line tagma 41a respectively, has formed broken line type structure as shown in Figure 5.The set-up mode of the live width of thin grid line 411 and live width embodiment illustrated in fig. 3 is basic identical.For example, thin grid line 411 live width scopes can be 0.1 to 0.5 millimeter, and many secondary grid lines 43 on the battery directly are communicated with (conducting) in thin grid line 411.Thin grid line 411 also is used to be welded to connect interconnector, and so that a plurality of solar cells series connection are connected to form solar module, during welding, interconnector is that the outermost edge with broken line is welded to connect.Than solar cell embodiment illustrated in fig. 3 30, solar cell 40 can reduce the contact area of main grid line and substrate more.
Figure 6 shows that planar structure schematic diagram according to the solar cell of an embodiment more provided by the utility model.Comparison diagram 5 and shown in Figure 6, the line tagma 41a of the main grid line 41 of the front electrode of the solar cell 50 in the present embodiment is configured to the thin grid line 511 that broken line type is provided with equally, and its main difference is the concrete structure difference to some extent of the thin grid line 511 of broken line type.The same side that every section thin grid line shown in Figure 5 is online tagma is connected on the test point; And as shown in Figure 6, thin grid line 511 is made up of multistage, and every section thin grid line passes through tested points 415 links together, thereby can realize conducting each other, and the not homonymy in the every section thin online tagma of grid line is connected on the test point.Therefore, in this embodiment, the width of line tagma 41a is to determine with the distance between the thin grid line at two edges at test point place.
The line tagma of the main grid line of solar cell of the present utility model only comprises thin grid line and the necessary test point that width is superfine, make the contact area of main grid line and substrate reduce greatly, the slurry printing zone that also is the main grid line also reduces to greatest extent, the main grid cross-sectional area also reduces greatly, therefore the use amount that can save slurry is to greatest extent significantly saved cost of sizing agent.
In addition, under the situation that the slurry printing area significantly reduces, can reduce on the one hand compound between metal and the silicon, improve the conversion efficiency of battery and assembly; On the other hand, after the interconnector welding, can reduce the stress (stress be owing to the thermal expansion of silver electrode main grid line and solar cell substrate silicon and constriction coefficient inconsistent causes) of main grid line when the solder interconnections bar, thereby, be easy to fragment phenomenon and the latent phenomenon of splitting of avoiding welding process to produce.
In the battery main grid line structure of aforesaid embodiment, if only consider from single main grid line, because the cross-sectional area of main grid line also reduces greatly, the series resistance of main grid line increases with respect to the series resistance of the main grid line of former gross area printing, but, because one of them effect of main grid line is to be used for being welded to connect interconnector to form solar module, the sectional area of interconnector is more much bigger than the sectional area of main grid line usually, differs usually to surpass more than 10 times; And can prove by sample plot that interconnector is less with contact resistance (for example contacting by the terne metal) resistance of main grid line, very little to the overall electrical resistance influence.Therefore, consider from the whole angle of solar module, even the series resistance of main grid line increases, and the interconnector that is welded to connect on the main grid line is main current path, series resistance on the interconnector does not increase, therefore, it can't influence the conversion efficiency of solar module, and the increase of the series resistance of main grid line does not bring apparent in view negative interaction on the whole from solar module.
Continue as shown in Figure 3, two head part of the edge of the solar cell of main grid line 31 also are provided with the end of a thread district 32b.This is because the main grid line forms by sintering process after substantially all will printing, if the main grid line of the edge of solar cell also is set to the same width of main grid line (line tagma 31a) with mid portion, when sintering formed the main grid line, two end portions was very easy to warpage.Therefore, the end of a thread district 32b is set to thinner triangle relatively, to avoid the warpage of two end portions.
Figure 7 shows that structural representation according to the end of a thread district of the main grid line of the utility model solar cell shown in Figure 3.As shown in Figure 7, also can comprise the end of a thread district 31b at two of the line tagma of main grid line 31 31a.Two of the first thin grid line 311 and the second thin grid line 312 is connected in the end of a thread district 31b.Wherein, at least one the end of a thread district is roughly leg-of-mutton pointed shape, and the end of a thread district is set to comprise vacancy section 316, thereby can further reduce the use of the slurry in the end of a thread district, and reduces compound, as to reduce battery problems such as flexural deformation, crackle and fragment.Vacancy section 316 can be for comprising a plurality of circular holes, and the aperture of circular hole can be 50 microns to 400 microns, can select according to the concrete area size in the end of a thread district.It is pointed out that vacancy section 316 might not be defined as the circular hole of present embodiment, for example can also be poroid or the like for square hole shape, triangle.
Figure 8 shows that another kind of structural representation according to the end of a thread district of the main grid line of the utility model solar cell shown in Figure 3.As shown in Figure 8, the end of a thread district 31b is roughly leg-of-mutton pointed shape too, the end of a thread district 31b of triangle is surrounded by the line stretcher of thin grid line 311 and 312 to form, therefore, in this embodiment, the end of a thread district 31b is configured to the triangle of thin grid line 311b and 312b formation, and wherein thin grid line 311b is the extension of thin grid line 311, and thin grid line 312b is the extension of thin grid line 312.The live width scope of thin grid line 311b and 312a can be 0.1 to 0.5 millimeter.
Need to prove, more than shown in main grid line and secondary grid line be the shape and structure of the front electrode of solar cell, still, can be applied to the backplate of solar cell equally about the structural design thought of main grid line.
According to another aspect of the present utility model, the utility model provides a kind of half tone that the electrode of above-mentioned solar cell is made in silk screen printing that is used for.The electrode of above-described solar cell is to form by the silk-screen printing technique manufacturing, and slurry (for example silver slurry) passes by the mesh on the half tone and is transferred on the substrate of solar cell, to realize the predetermined pattern shape of electrode.Therefore, the shape (the especially shape of main grid line) of the electrode that the shape of mesh and desire form in the half tone of this utility model is complementary, half tone be provided be used for composition form the above and the pattern main grid line, that slurry is passed through.
Present embodiment provides a kind of solar module more on the one hand according to of the present utility model, it comprise a plurality of the above and solar cells, and comprise and be welded to connect interconnector on the main grid line of a plurality of solar cells, that be used to connect solar cell.Particularly, be connected in series by interconnector between the solar cell, interconnector by the welding the bonding or otherwise be connected on the main grid line of electrode.In conjunction with the embodiment of Fig. 3 or solar cell shown in Figure 5, interconnector can connect with welding in thin grid line 311 and 312 or be welded to connect on thin grid line 411, thereby wholely covers whole main grid line.Usually the sectional area of interconnector is more much bigger than the sectional area of main grid line; generally differ and surpass more than 10 times; and can prove by sample plot that interconnector is less with contact resistance (for example contacting by the terne metal) resistance of main grid line, very little to the overall electrical resistance influence.Therefore, consider from the whole angle of solar module, even the series resistance of main grid line increases, and the interconnector that is welded to connect on the main grid line is main current path, series resistance on the interconnector of welding back is not significantly increased, therefore, it can't influence the conversion efficiency of solar module, and the increase of the series resistance of main grid line does not bring apparent in view negative interaction on the whole from solar module.On the contrary, because the contact area of main grid line and substrate reduces (the slurry printing area significantly reduces), the cost of solar module reduces, conversion efficiency increases and reliability is improved (being easy to avoid the fragment phenomenon that welding process produces and concealing split phenomenon).
Above example is structure, half tone and the solar module that example illustrates solar cell of the present utility model with the front electrode of battery mainly.Although only some of them execution mode of the present utility model is described, those of ordinary skills should understand, and the utility model can be in not departing from its purport and scope be implemented with many other forms.Therefore, example of being showed and execution mode are regarded as illustrative and not restrictive, and under situation about not breaking away from as defined the utility model spirit of appended each claim and scope, the utility model may be contained various modifications and replacement.
Claims (23)
1. solar cell comprises cell substrate and is arranged on electrode on the substrate that described electrode comprises the main grid line, it is characterized in that, the line tagma of described main grid line is configured to comprise that the structure of at least one thin grid line is to reduce the contact area of main grid line and substrate.
2. solar cell as claimed in claim 1 is characterized in that, described main grid line comprises the first thin grid line and the second thin grid line on the dual-side edge that lays respectively at the line tagma.
3. solar cell as claimed in claim 1 is characterized in that, the thin grid line in the line tagma of described main grid line is one, and described thin grid line is set to be the lines of broken line type.
4. solar cell as claimed in claim 3 is characterized in that, the line tagma of described main grid line also comprises at least one test point, and the described thin grid line that is broken line type is divided into multistage by described test point, and the two ends of every section described thin grid line are electrically connected with described test point.
5. solar cell as claimed in claim 4 is characterized in that, the same side in the online tagma, two ends of every section described thin grid line is electrically connected with described test point.
6. solar cell as claimed in claim 4 is characterized in that, the not homonymy in the online tagma, two ends of every section described thin grid line is electrically connected with described test point.
7. as claim 1 or 2 or 3 described solar cells, it is characterized in that the live width of described thin grid line is 0.1 to 0.5 millimeter.
8. solar cell as claimed in claim 2 is characterized in that, the described first thin grid line and the second thin grid line are parallel to each other and the width in the line tagma of described main grid line is 1.2 to 2 millimeters.
9. as claim 2 or 3 described solar cells, it is characterized in that the line tagma of described main grid line also comprises at least one test point, described test point is electrically connected with described thin grid line.
10. solar cell as claimed in claim 9 is characterized in that described test point is configured to rectangle.
11. solar cell as claimed in claim 9 is characterized in that, described test point is configured to comprise many lines.
12. solar cell as claimed in claim 1 is characterized in that, described main grid line also can comprise at least one the end of a thread district that is positioned at line tagma head.
13. solar cell as claimed in claim 12 is characterized in that, described the end of a thread district is configured to leg-of-mutton pointed shape.
14., it is characterized in that described the end of a thread district is provided with the hollow out zone as claim 12 or 13 described solar cells.
15. solar cell as claimed in claim 14 is characterized in that, described hollow out zone is circular, and its diameter is 50 to 400 microns.
16. solar cell as claimed in claim 12 is characterized in that, described the end of a thread district is configured to the triangular shaped of thin grid line formation.
17. one kind is used for the half tone that the electrode of solar cell is made in silk screen printing, it is characterized in that, described half tone is provided with and is used for the pattern main grid line, that make the mesh that slurry passes through that composition forms described electrode; Wherein, the line tagma of described main grid line is configured to comprise that the structure of at least one thin grid line is to reduce the contact area of main grid line and substrate.
18. half tone as claimed in claim 17 is characterized in that, described main grid line comprises the first thin grid line and the second thin grid line on the dual-side edge that lays respectively at the line tagma.
19. half tone as claimed in claim 17 is characterized in that, the thin grid line in the line tagma of described main grid line is one, and described thin grid line is set to be the lines of broken line type.
20., it is characterized in that the live width of described thin grid line is 0.1 to 0.5 millimeter as claim 17 or 18 or 19 described half tones.
21. half tone as claimed in claim 17 is characterized in that, also comprises pattern the end of a thread district, that make the mesh that slurry passes through that is used for forming corresponding to composition the main grid line, wherein is provided with the zone that a plurality of prevention slurries pass through.
22. solar module, it is characterized in that, described solar module comprises a plurality of as each described solar cell in the claim 1 to 16, connects by interconnector between the described solar cell, and described interconnector is connected on the main grid line of electrode of described solar cell.
23. solar module as claimed in claim 22 is characterized in that, described interconnector is to be connected with the main grid line of the electrode of described solar cell by the mode that bonds or weld, and described interconnector covers on the whole main grid line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020201844XU CN201859886U (en) | 2010-05-13 | 2010-05-13 | Solar battery, screen and solar battery component thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201020201844XU CN201859886U (en) | 2010-05-13 | 2010-05-13 | Solar battery, screen and solar battery component thereof |
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| Publication Number | Publication Date |
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| CN201859886U true CN201859886U (en) | 2011-06-08 |
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| CN201020201844XU Expired - Lifetime CN201859886U (en) | 2010-05-13 | 2010-05-13 | Solar battery, screen and solar battery component thereof |
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| CN102543940A (en) * | 2012-01-17 | 2012-07-04 | 南通富士通微电子股份有限公司 | Wafer-level packaging optimized structure |
| CN102555562A (en) * | 2011-12-28 | 2012-07-11 | 晶澳（扬州）太阳能科技有限公司 | Printing process of solar battery plate |
| CN102582220A (en) * | 2012-02-29 | 2012-07-18 | 苏州欧方电子科技有限公司 | Method for manufacturing anode screen plate for improving solar cell silicon sheet conversion rate |
| CN103171261A (en) * | 2011-12-23 | 2013-06-26 | 昆山允升吉光电科技有限公司 | Screen board used for printing of positive electrode of crystalline silicon solar cell |
| CN103171263A (en) * | 2011-12-23 | 2013-06-26 | 昆山允升吉光电科技有限公司 | Screen board used for printing of positive electrode of crystalline silicon solar cell |
| CN103192596A (en) * | 2012-01-06 | 2013-07-10 | 昆山允升吉光电科技有限公司 | Screen mesh |
| CN104411504A (en) * | 2012-06-19 | 2015-03-11 | 株式会社钢臂功科研 | Mesh member for screen printing and screen printing plate |
| CN104428899A (en) * | 2012-06-06 | 2015-03-18 | 日本麦可罗尼克斯股份有限公司 | Electrode structure of solid type rechargeable battery |
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| CN103192596A (en) * | 2012-01-06 | 2013-07-10 | 昆山允升吉光电科技有限公司 | Screen mesh |
| CN102543940A (en) * | 2012-01-17 | 2012-07-04 | 南通富士通微电子股份有限公司 | Wafer-level packaging optimized structure |
| CN102582220A (en) * | 2012-02-29 | 2012-07-18 | 苏州欧方电子科技有限公司 | Method for manufacturing anode screen plate for improving solar cell silicon sheet conversion rate |
| CN104428899A (en) * | 2012-06-06 | 2015-03-18 | 日本麦可罗尼克斯股份有限公司 | Electrode structure of solid type rechargeable battery |
| CN104411504A (en) * | 2012-06-19 | 2015-03-11 | 株式会社钢臂功科研 | Mesh member for screen printing and screen printing plate |
| CN104411504B (en) * | 2012-06-19 | 2016-07-06 | 株式会社钢臂功科研 | Silk screen printing grid mesh part and screen printing plate |
| CN106364140A (en) * | 2016-10-25 | 2017-02-01 | 昆山良品丝印器材有限公司 | Film structure for solar crystalline silicon battery slice and printing screen of film structure |
| CN106364140B (en) * | 2016-10-25 | 2018-06-15 | 昆山良品丝印器材有限公司 | Solar energy crystalline silicon battery plate film structure and its printing screen plate |
| CN107738503A (en) * | 2017-09-15 | 2018-02-27 | 东方环晟光伏（江苏）有限公司 | Solar cell size printing process |
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| WO2021008474A1 (en) * | 2019-07-16 | 2021-01-21 | 苏州携创新能源科技有限公司 | Solar cell and photovoltaic module |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: WUXI DEXIN SOLAR POWER CO., LTD. Assignor: Wuxi Shangde Solar Electric Power Co., Ltd. Contract record no.: 2013990000143 Denomination of utility model: Solar cell, screen printing plate and solar cell module thereof Granted publication date: 20110608 License type: Exclusive License Record date: 20130409 Assignee: WUXI DEXIN SOLAR POWER CO., LTD. Assignor: Wuxi Shangde Solar Electric Power Co., Ltd. Contract record no.: 2013990000143 Denomination of utility model: Solar cell, screen printing plate and solar cell module thereof Granted publication date: 20110608 License type: Exclusive License Record date: 20130409 |
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| LICC | Enforcement, change and cancellation of record of contracts on the licence for exploitation of a patent or utility model | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110608 |