CN204834651U - Solar module that low temperature concatenated - Google Patents
Solar module that low temperature concatenated Download PDFInfo
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- CN204834651U CN204834651U CN201520482529.1U CN201520482529U CN204834651U CN 204834651 U CN204834651 U CN 204834651U CN 201520482529 U CN201520482529 U CN 201520482529U CN 204834651 U CN204834651 U CN 204834651U
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- welding
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- grid line
- low temperature
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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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Abstract
The utility model discloses a solar module that low temperature concatenated, it includes a plurality of two -sided heterojunction solar wafer that weld the area and be printed on thin grid line, still includes a plurality of ECA electrocondution slurry layers, the ECA electrocondution slurry layer sets up on the thin grid line, and it is perpendicular with thin grid line, it sets up to weld the area ECA electrocondution slurry layer top is connected through welding the area between two adjacent two -sided heterojunction solar wafer. This battery pack can effectively guarantee the amorphous silicon layer on battery piece two sides and the damage that transparent conducting film did not receive high temperature so that whole battery piece all goes on under the lower technology temperature to the encapsulation process of module.
Description
Technical field
The utility model belongs to solar module field, is specifically related to the solar module of a kind of low temperature serial connection.
Background technology
Need to be printed on the superfine grid line of metal electric (being called for short thin grid line 11) and metal electrode main gate line (being called for short main gate line 10) vertical with it using crystalline silicon as the sensitive surface of the solar cell of substrate or sensitive surface with the back side, to collect the electric current that cell piece produces as metal electrode (abbreviation electrode), the also conducting crossing with main gate line of thin grid line.Conduction welding is soldered in main gate line to collect electric current and at operation afterwards and other cell piece series and parallels.
Traditional solar cell needs to be welded on cell piece by high-temperature technologies such as electric iron welding by conduction welding after cell piece manufacture completes, solder technology welding temperature generally more than 300 degrees Celsius even nearly 400 degrees Celsius now, and are greatly subject to welding temperature and weld time the impact that operating personnel weld technical ability.
Emerging heterojunction solar battery sheet (HJT), as shown in Figure 6, uses through the surface-treated such as making herbs into wool, cleaning crystalline silicon silicon as substrate 8.By the amorphous silicon layer that existing coating technique successively plates intrinsic amorphous silicon layer 7 at silicon chip surface and is doped with, doped amorphous silicon layer comprises the P-type non-crystalline silicon layer 5 and N-type non-crystalline silicon layer 6 that are in upper and lower surface respectively.After more than completing, at sensitive surface doped amorphous silicon layer plated surface last layer including transparent conducting oxide layer 12(and TCO, TransparentConductingOxide).
Because heterojunction (being called for short HJT:Hetero-JunctionTechnology) solar cell surface exists amorphous silicon layer and including transparent conducting oxide layer, its amorphous silicon layer thickness only 5-30nm is even thinner, amorphous silicon layer manufacturing process is generally 180 ~ 220 degrees Celsius, too high elargol sintering temperature and welding temperature can cause increasing of amorphous silicon layer and conductive oxide layer heated portion defect, and then have a strong impact on cell piece transformation efficiency.And high temperature easily causes cell piece to bend fragment, be unfavorable for manufacturing thinner solar battery sheet.In order to make full use of the advantage of this type of emerging solar cell manufacturing technology, we need to reduce battery as far as possible to assembly CTM(celltomodule) technological temperature of each operation in encapsulation process; The manufacture of the whole battery of heterojunction solar battery General Requirements now and packaging technology control within 200 degrees Celsius.
There is a kind of conductive tape CF(ConductiveFilm using macromolecular materials such as PET as base material in recent years, be different from conducting resinl) technology of bonding welding.Be characterized in pasting several conductive tapes at the position of main grid mark, connected by welding between two adjacent cell pieces.This kind of adhesive technology defect is: when 1, pasting conductive tape and welding, all parts all need accurate calibration, and the higher and yields of production equipment manufacture, maintenance cost is restricted, and high tack time makes production capacity limited; 2, be limited by the manufacturing technology of conductive tape, conductive tape cannot be accomplished narrower, can accomplish 1mm at present but has been almost also limiting value; 3, because conductive tape CF itself is by macromolecular material as base material, its coefficient of expansion and welding metal group material coefficient of expansion difference are comparatively large, bring the problems such as power attenuation after environmental reliability test is serious.Therefore conductive tape adhesive technology is not well developed at present.
In addition, the textured welding of surface band of new technique is adopted to improve conversion efficiency, as shown in Figure 8, sunlight incides the effect due to its surface pattern behind LCR (LightCapturingRibbon) surface, and sunlight can by be larger angle with header board glass normal direction, direction reflexes to header board glass surface.Due to the difference of front glass sheet and air refraction, light in the generation total reflection of header board glass surface and then can reflex to solar cell surface again, is absorbed by silicon chip.Thus the negative effect brought after reducing welding shading, improve solar conversion efficiency.But because this kind of welding surface exists lines, traditional solder technology cannot not destroy light trapping structure under the prerequisite ensureing its welding effect, this makes this application of welding in power boosting scheme with LCR structure restricted greatly.
Therefore, how to find and be a kind ofly applicable to hetero-junction solar cell to be together in series make the method for assembly, can with lower than hetero-junction solar cell manufacture craft temperature welding or serial connection temperature, cell piece is connected in series well, make again by cell piece minimum to the power loss of assembly (CTM:celltomodule), and possessing reliable environmental testing stability, the compatible all welding LCR if any light trapping structure of energy, to promote conversion efficiency, become a problem of current industrial circle gradually.
Utility model content
The purpose of this utility model is a kind of battery component being suitable for hetero-junction solar cell of research, can with lower than hetero-junction solar cell manufacture craft temperature welding or serial connection temperature, cell piece is connected in series well, make by cell piece minimum to the power loss of assembly (CTM:celltomodule), and possess reliable environmental testing stability.
For solving the problems of the technologies described above, the technical scheme that the utility model adopts is:
A kind of solar module of low temperature serial connection, comprise some weldings and be printed on the some two-sided heterojunction solar battery sheet of thin grid line, also comprise some ECA conductive paste bed of materials, the described ECA conductive paste bed of material is arranged on described thin grid line, and vertical with thin grid line; Described welding is arranged on above the described ECA conductive paste bed of material, is connected between adjacent two two-sided heterojunction solar battery sheets by welding.
Described ECA electrocondution slurry (ECA:ElectricallyConductiveAdhesion) adopts rope nation (SoltaBondGmbH) company model to be PartA and the PartB two component of SB1242.
Preferred version, described welding is the welding with light trapping structure.
Preferred version, the phototropic face of described welding has triangular sawtooth shape reflecting section.
Further preferred version, described welding is the sunken flush weld band that LCR welding (LCR:LightCapturingRibbon) adopts Ulbrich company of the U.S..
Preferred version, described thin grid line quantity is 70 ~ 80, and thin grid line amount width is 75 ~ 85 microns, and thin grid line depth-width ratio is between 0.4 ~ 0.6.
Preferred version, described welding width is 0.7 ~ 0.8mm, and thickness is 0.5-0.7mm.
Preferred version, described two-sided heterojunction solar battery sheet is also printed on main gate line, and described main gate line is printed on described thin grid line, and vertical with thin grid line; The described ECA conductive paste bed of material is arranged in described main gate line.
Further preferred version, described main gate line quantity is 5-8 bar; Width≤welding the width of main gate line amount, main gate line thickness is 0.5-0.7mm.
Use the conduction welding (LCR:LightCapturingRibbon) with light trapping structure to be connected in series between the two panels cell piece of battery component of the present utility model, between cell piece with conduction welding, use the ECA conductive paste bed of material (ECA:ElectricallyConductiveAdhesion) bonding.This battery component can make whole cell piece all carry out under lower technological temperature to the packaging process of module, effectively ensure that the amorphous silicon layer on cell piece two sides and transparency conducting layer are not subject to the damage of high temperature.
Accompanying drawing explanation
Fig. 1 is the vertical section figure (not containing main gate line) formed after three battery welding serial connections, the positive pole of first piece of cell piece and the negative pole UNICOM of second piece of cell piece in Fig. 1, and the positive pole of second piece of battery is connected with the negative pole of the 3rd piece of battery;
Fig. 2 is the vertical view of Fig. 1;
Fig. 3 is the vertical section figure (containing main gate line) formed after three battery welding serial connections, the positive pole of first piece of cell piece and the negative pole UNICOM of second piece of cell piece in Fig. 1, and the positive pole of second piece of battery is connected with the negative pole of the 3rd piece of battery;
Fig. 4 is the vertical view of Fig. 3;
The Structure of cross section schematic diagram (not containing main gate line) of the monoblock battery of Fig. 5 after to be that welding is bonding complete;
The Structure of cross section schematic diagram (containing main gate line) of the monoblock battery of Fig. 6 after to be that welding is bonding complete;
The vertical view of the monoblock battery of Fig. 7 after to be that welding is bonding complete, what this legend adopted is 3 weldings/main gate line design.
Fig. 8 is that welding is bonding front, the vertical view of the monoblock battery that band main gate line 10 designs.
Fig. 9 is that welding is bonding front, the vertical view of the monoblock battery not with main gate line 10 design.
Figure 10 is the schematic diagram that LCR (welding of band light trapping effect) works.
Wherein, 1 is the ECA conductive paste bed of material, and 2 is front glass sheets, and 3 is weldings, 4 is heterojunction solar battery sheets, and 5 is P-type non-crystalline silicon layers, and 6 is N-type non-crystalline silicon layer, and 7 is intrinsic amorphous silicon layer, 8 is substrates, and 10 is main gate line, and 11 is thin grid lines, and 12 is including transparent conducting oxide layers.
Embodiment
Below in conjunction with embodiment, the utility model is described further.
A kind of solar module of low temperature serial connection, comprise some weldings 3 and be printed on the some two-sided heterojunction solar battery sheet 4 of thin grid line 11, also comprise some ECA conductive paste bed of materials 1, the described ECA conductive paste bed of material 1 is arranged on described thin grid line 11, and vertical with thin grid line; Described welding 3 is arranged on the described ECA conductive paste bed of material 1, is connected between adjacent two two-sided heterojunction solar battery sheets 4 by welding 3.
As shown in Figure 8, described welding 3 is the welding with light trapping structure, and the phototropic face of described welding 3 has triangular sawtooth shape reflecting section.Described welding 3 more preferably LCR welding.
The overall difference of the solar cell manufacturing process such as HJT is little in the industry for this kind of solar cell manufacturing process and current line, can make full use of prior art resource.
After solar battery sheet completes all front-end-of-line, the technology of silk screen printing need be adopted to print metal electrode at battery surface, and use the ECA conductive paste bed of material 1 welding to be adhered to battery surface to be connected in series two pieces of cell pieces.Specifically there are two kinds of execution modes:
1. the thin grid line 11 of type metal electrode, makes metal electrode main gate line 10 in the direction vertical with thin grid line, and main gate line selects the material of two component conductive silver slurry; After main gate line surface is coated with the print ECA conductive paste bed of material 1, welding 3 is attached in main gate line so that the both positive and negative polarity of the two pieces of cell pieces completing metal electrode operation is connected in series, mutually through lamination curing molding.Thin grid line quantity is 70 ~ 80, and main gate line quantity is 5; It is 75 ~ 85um that thin grid line measures width, and depth-width ratio is between 0.4 ~ 0.6, and it is 0.6 ~ 0.8mm that main gate line measures width; Welding width is 0.8mm, and thickness is 0.5mm; Lamination curing molding temperature is 140 ~ 160 degrees Celsius, and the time is between 10 ~ 60 minutes.
2. the thin grid line 11 of type metal electrode, do not print main gate line 10, only be coated with the print ECA conductive paste bed of material 1 in main gate line position, after welding 3 is attached to main gate line 10 position to be connected in series, the both positive and negative polarity of the two pieces of cell pieces completing metal electrode operation through lamination curing molding mutually.Thin grid line quantity is 70 ~ 80, and ECA electrocondution slurry number of plies amount is 5; It is 75 ~ 85um that thin grid line measures width, and depth-width ratio is between 0.4 ~ 0.6, and it is 0.6 ~ 0.8mm that the ECA conductive paste bed of material measures width; Welding width is 0.8mm, and thickness is 0.5mm; Lamination curing molding temperature is 140 ~ 160 degrees Celsius, and the time is between 10 ~ 60 minutes.
Claims (8)
1. the solar module of a low temperature serial connection, comprise some weldings and be printed on the some two-sided heterojunction solar battery sheet of thin grid line, it is characterized in that, also comprise some ECA conductive paste bed of materials, the described ECA conductive paste bed of material is arranged on described thin grid line, and vertical with thin grid line; Described welding is arranged on the described ECA conductive paste bed of material, is connected between adjacent two two-sided heterojunction solar battery sheets by welding.
2. according to claim 1 low temperature serial connection solar module, it is characterized in that, described welding is the welding with light trapping structure.
3. the solar module that low temperature is connected in series according to claim 1 or 2, it is characterized in that, the phototropic face of described welding has triangular sawtooth shape reflecting section.
4. the solar module that low temperature is connected in series according to claim 1 or 2, it is characterized in that, described welding is LCR welding.
5. the solar module that low temperature is connected in series according to claim 1 or 2, it is characterized in that, described thin grid line quantity is 70 ~ 80, and thin grid line amount width is 75 ~ 85 microns, and thin grid line depth-width ratio is between 0.4 ~ 0.6.
6. the solar module that low temperature is connected in series according to claim 1 or 2, it is characterized in that, described welding width is 0.7 ~ 0.8mm, and thickness is 0.5-0.7mm.
7. the solar module that low temperature is connected in series according to claim 1 or 2, it is characterized in that, described two-sided heterojunction solar battery sheet is also printed on main gate line, and described main gate line is printed on described thin grid line, and vertical with thin grid line; The described ECA conductive paste bed of material is arranged in described main gate line.
8. according to claim 7 low temperature serial connection solar module, it is characterized in that, described main gate line quantity is 5-8 bar; Width≤welding the width of main gate line amount, main gate line thickness is 0.5-0.7mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520482529.1U CN204834651U (en) | 2015-07-07 | 2015-07-07 | Solar module that low temperature concatenated |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520482529.1U CN204834651U (en) | 2015-07-07 | 2015-07-07 | Solar module that low temperature concatenated |
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| CN204834651U true CN204834651U (en) | 2015-12-02 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111540801A (en) * | 2020-05-14 | 2020-08-14 | 中威新能源(成都)有限公司 | Manufacturing and repairing method of low-temperature silicon heterojunction battery assembly |
| US20220216357A1 (en) * | 2019-05-23 | 2022-07-07 | Alpha Assembly Solutions Inc. | Solder paste for module fabrication of solar cells |
| WO2023005913A1 (en) * | 2021-07-28 | 2023-02-02 | 天合光能股份有限公司 | Solar cell string and manufacturing method therefor and application thereof |
-
2015
- 2015-07-07 CN CN201520482529.1U patent/CN204834651U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20220216357A1 (en) * | 2019-05-23 | 2022-07-07 | Alpha Assembly Solutions Inc. | Solder paste for module fabrication of solar cells |
| CN111540801A (en) * | 2020-05-14 | 2020-08-14 | 中威新能源(成都)有限公司 | Manufacturing and repairing method of low-temperature silicon heterojunction battery assembly |
| WO2023005913A1 (en) * | 2021-07-28 | 2023-02-02 | 天合光能股份有限公司 | Solar cell string and manufacturing method therefor and application thereof |
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