CN102983195B - A kind of welding for back contact solar cell - Google Patents
A kind of welding for back contact solar cell Download PDFInfo
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- CN102983195B CN102983195B CN201210484506.5A CN201210484506A CN102983195B CN 102983195 B CN102983195 B CN 102983195B CN 201210484506 A CN201210484506 A CN 201210484506A CN 102983195 B CN102983195 B CN 102983195B
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- welding
- solar cell
- back contact
- contact solar
- insulating barrier
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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 invention discloses a kind of welding for back contact solar cell, comprise a conduction welding body, the obverse and reverse of described conduction welding body is equipped with insulating barrier, the insulating barrier in conduction welding body front is also provided with the conductive hole coordinated with the mesoporous metal electrode district of back contact solar cell, and the insulating barrier at the described conduction welding body back side is provided with and described conductive hole thermal hole one to one; Metal solder coating is provided with in described conductive hole.This invention exploits a kind of welding being specifically designed to back contact solar cell newly, it directly can carry out welding operation on back contact battery sheet, and do not need extra technique to isolate to make the both positive and negative polarity of cell piece, thus simplify production technology, be particularly suitable for the automatic welding of streamline.
Description
Technical field
The present invention relates to a kind of welding for back contact solar cell, belong to technical field of solar.
Background technology
Along with solar module extensive use, photovoltaic generation more and more occupies important proportion in new forms of energy, obtains develop rapidly.But relative to traditional energy, the cost of electricity-generating of photovoltaic generation is still higher.In order to reduce costs further, a kind of important mode adopts high-efficiency battery, high-efficiency battery can produce more electric power in unit are, thus reduce expensive silicon material use, and the erection space decreased shared by system component, thus improve income on the whole, reduce the cost of photovoltaic generation.
Back contact solar cell is at present can one of the most important high-efficiency battery of large-scale production.Compared with common crystal silicon solar cell, the positive pole of back contact solar cell and negative pole are all located at the back side of cell piece, and both positive and negative polarity is connected by welding, and welding affects without shading cell piece, thus the shading of cell piece can be reduced, improve the conversion efficiency of cell piece.
The back side of back contact solar cell comprises plurality of holes metal electrode bonding pad (mesoporous metal electrode is generally in array distribution) and non-mesoporous metal electrode district, i.e. back surface field area, because mesoporous metal electrode connecting region and back surface field area are electrically contrary, and when adopting traditional welding to carry out interconnected, because traditional welding is a common metal tape (copper strips as with tin coating), its two sides is all conduction, the surface in the non-solder district of welding can be caused to contact with non-mesoporous metal electrode district and be short-circuited after therefore directly welding.
For the problems referred to above, existing method uses insulation strip to isolate between welding and non-mesoporous metal electrode district, the insulation strip used is (as EPE dielectric film, be made up of EVA/PET/EVA trilamellar membrane) need to be cut in advance the shape of applicable mesoporous metal electrodes series and welding, need perforate in the insulation strip of the position relative to mesoporous metal electrode district, so that the welding of welding and mesoporous metal electrode district simultaneously.Obviously, this method can only manual operation, and waste time and energy, cost is higher.
Summary of the invention
The object of the invention is to provide a kind of welding for back contact solar cell.
For achieving the above object, the technical solution used in the present invention is: a kind of welding for back contact solar cell, comprise a conduction welding body, the obverse and reverse of described conduction welding body is equipped with insulating barrier, the insulating barrier in conduction welding body front is also provided with the conductive hole coordinated with the mesoporous metal electrode district of back contact solar cell
The insulating barrier at the described conduction welding body back side is provided with and described conductive hole thermal hole one to one;
Metal solder coating is provided with in described conductive hole.
Above, described conduction welding body can adopt prior art, such as oxygen-free copper stripe.
The effect of described conductive hole is used to connection welding belt and mesoporous metal electrode district, and therefore, the distribution of conductive hole must be identical with the difference of mesoporous metal electrode.
The effect of described thermal hole carries out heat conduction in welding process, to make the overcoat fusing welding of the metal solder in the conductive hole of welding another side.
In technique scheme, be full of in described thermal hole and be provided with metal solder coating.
In technique scheme, described metal solder coating is the plumbous silver coating of tin lead finish or tin.
Preferred technical scheme, described conductive hole and thermal hole one_to_one corresponding and center superposition.
In technique scheme, the both sides of described conduction welding body are provided with insulating barrier.Two sides on the thickness direction of i.e. welding are also provided with insulating barrier, to wrap up conduction welding body further, prevent it from causing electrical property to decline because of oxidation.
Preferred technical scheme, described insulating barrier is insulating lacquer layer.Insulating varnish can be one or more in polyester, polyurethane, nylon, polyimides.
The material of described insulating barrier can, only containing organic and/or inorganic materials or organic material, also can be mixing or the compound of two kinds.Such as, when adopting inorganic material, can adopt mica, asbestos, when adopting organic material, can be one or more in insulating varnish, insulating cement, dielectric film, insulating paper, glass fiber, rubber; Dielectric film can be one or more in polyester film, polyacrylic film, polyamide, polyimides, nylon.
Described insulating barrier can be one deck, also can be multilayer.
The preparation method of above-mentioned welding can adopt following steps:
1) by dip-coating, spraying, printing, wrapped in one or more methods form insulating barrier in conduction welding body (as flat copper band), insulating barrier can apply and be bonded on conduction welding body;
2) in the conduction conductive hole in welding body front and the thermal hole at the back side, metal solder coating is formed by one or more methods in spraying, brushing, immersion plating, wicking, spray tin, tin brush plating, pressure tin, paste solder printing, tin cream spray printing.
Certainly, conduction welding body first can form insulating barrier, rear formation metal solder coating; Also can first form metal solder coating, then form insulating barrier.
Due to the employing of technique scheme, compared with prior art, tool of the present invention has the following advantages:
1. this invention exploits a kind of welding being specifically designed to back contact solar cell newly, it directly can carry out welding operation on back contact battery sheet, and do not need extra technique to isolate to make the both positive and negative polarity of cell piece, thus simplify production technology, be particularly suitable for the automatic welding of streamline, substantially increase production efficiency, achieve significant effect, there is positive realistic meaning.
2. the present invention is equipped with insulating barrier at the obverse and reverse of conduction welding body, adds the pliability of welding; For existing welding, welding of the present invention utilizes insulating barrier to instead of part metals coating, thus relatively can reduce the use of metal coating, reduce the manufacturing cost of component integration.
3. welding of the present invention is easy to preparation, and cost is lower, is suitable for applying.
Accompanying drawing explanation
Fig. 1 is the partial top view of the embodiment of the present invention one;
Fig. 2 is the partial sectional view of the embodiment of the present invention one; (metal solder coating does not draw)
Fig. 3 is the partial sectional view of the embodiment of the present invention one.
Wherein: 1, conduction welding body; 2, insulating barrier; 3, conductive hole; 4, thermal hole; 5, metal solder coating.
Embodiment
Below in conjunction with embodiment, the invention will be further described:
Embodiment one
Shown in Fig. 1 ~ 3, a kind of welding for back contact solar cell, comprise a conduction welding body 1, the obverse and reverse of described conduction welding body is equipped with insulating barrier 2, the insulating barrier in conduction welding body front is also provided with the conductive hole 3 coordinated with the mesoporous metal electrode district of back contact solar cell
The insulating barrier at the described conduction welding body back side is provided with and described conductive hole thermal hole 4 one to one; Described conductive hole and thermal hole one_to_one corresponding and center superposition;
Metal solder coating 5 is provided with in described conductive hole.Be full of in described thermal hole and be provided with metal solder coating.Described metal solder coating is tin lead finish.
The both sides of described conduction welding body are provided with insulating barrier.Described insulating barrier is insulating lacquer layer.
The concrete preparation method of above-mentioned welding is as follows:
Take wide cut as 36mm, thickness is that the oxygen-free copper stripe of 0.2 micron is as conduction welding body; R-831-S epoxy resin enamel is adopted to be insulating varnish, wherein, epoxy glue: curing agent: diluent fully mixes by the mass ratio of 3:1:1;
Then epoxy resin enamel is printed on conduction welding body by the pattern of MWT battery mesoporous metal distribution of electrodes, and conduction welding body solidifies about 10min by curing oven at 70 ~ 80 DEG C;
Republish the another side of Copper Foil after epoxy resin enamel surface cure on conduction welding body, during printing, guarantee conductive hole and the alignment of thermal hole center of two-side graph on Copper Foil; After the epoxy resin enamel surface cure of conduction welding body another side,
Conduction welding body cuts into flat copper band by the wide cut of 4mm, more fully solidifies after epoxy resin enamel on the both sides of flat copper band apply simultaneously;
Then by above-mentioned flat copper band with the tin stove of wicking mode by the plumbous liquid of tin that fusing is housed, flat copper band is about 20s by the time of tin stove, after tin stove, the position (i.e. conductive hole and thermal hole interior) flat copper band not having print upper epoxy resin enamel defines the metal solder coating (tin layers) of one deck about 20 ~ 50 microns, and the speed that the concrete thickness of tin layers can cross tin stove by flat copper band regulates; The welding of above-mentioned formation is cut rear just can welding by certain length and is directly employed.
Embodiment two
For a welding for back contact solar cell, using wide cut be 3 millimeters, thickness is that the oxygen-free copper stripe of 0.2 millimeter is as conduction welding body; Adopt wide cut be the polyimides high temperature bond film of 7 millimeters as insulating barrier, this adhesive film temperature resistant grade is 300 degree, thickness about 50 microns; Pb-Sn paste is had as welding paste using FLY801-T3;
By the pattern perforate of the mesoporous metal distribution of electrodes of back contact solar cell on the center line prolonging polyimides high temperature membrane, then center, the hole alignment of two membranes up and down, is fitted on conduction welding body simultaneously, and makes it bond by suitable pressure to be adjacent to;
On conduction welding body two sides, dielectric film opening area central point all coats tin cream, then about 10mg is 220 DEG C of reflow solderings by temperature, continues 60 seconds, in uniform spreading welding bulk copper, metal solder coating is formed because of its good wetting and spreading after tin cream is heated and melts.
Claims (6)
1. the welding for back contact solar cell, comprise a conduction welding body (1), it is characterized in that: the obverse and reverse of described conduction welding body is all directly provided with insulating barrier (2), the insulating barrier in conduction welding body front is also provided with the conductive hole (3) coordinated with the mesoporous metal electrode district of back contact solar cell
The insulating barrier at the described conduction welding body back side is provided with and described conductive hole thermal hole (4) one to one;
Metal solder coating (5) is provided with in described conductive hole.
2. the welding for back contact solar cell according to claim 1, is characterized in that: be full of in described thermal hole and be provided with metal solder coating.
3. the welding for back contact solar cell according to claim 1 and 2, is characterized in that: described metal solder coating is the plumbous silver coating of tin lead finish or tin.
4. the welding for back contact solar cell according to claim 1, is characterized in that: described conductive hole and thermal hole one_to_one corresponding and center superposition.
5. the welding for back contact solar cell according to claim 1, is characterized in that: the both sides of described conduction welding body are provided with insulating barrier.
6. the welding for back contact solar cell according to claim 1, is characterized in that: described insulating barrier is insulating lacquer layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210484506.5A CN102983195B (en) | 2012-11-23 | 2012-11-23 | A kind of welding for back contact solar cell |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210484506.5A CN102983195B (en) | 2012-11-23 | 2012-11-23 | A kind of welding for back contact solar cell |
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| CN102983195A CN102983195A (en) | 2013-03-20 |
| CN102983195B true CN102983195B (en) | 2015-12-23 |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103346186A (en) * | 2013-07-09 | 2013-10-09 | 无锡市斯威克科技有限公司 | L-type plane bending solder strip for solar module |
| CN103456843A (en) * | 2013-09-17 | 2013-12-18 | 连云港神舟新能源有限公司 | Method for manufacturing back contact type crystalline silicon solar cell component |
| CN106328746A (en) * | 2015-06-30 | 2017-01-11 | 上海比亚迪有限公司 | Photovoltaic welding tape and preparation method |
| CN105826407B (en) * | 2016-03-21 | 2017-10-17 | 无锡携创新能源科技有限公司 | A kind of back contacts technique battery component and preparation method thereof |
| CN106653910B (en) * | 2016-12-23 | 2019-03-29 | 苏州腾晖光伏技术有限公司 | A kind of photovoltaic welding belt and preparation method thereof |
| CN107369735A (en) * | 2017-07-31 | 2017-11-21 | 善仁（浙江）新材料科技有限公司 | A kind of reflective membrane on photovoltaic module welding strip |
| CN107579132A (en) * | 2017-08-28 | 2018-01-12 | 善仁（浙江）新材料科技有限公司 | A kind of reflective membrane on photovoltaic module welding strip |
| CN108254248A (en) * | 2017-12-28 | 2018-07-06 | 南京日托光伏科技股份有限公司 | A kind of MWT battery electrode pull force test method and welding, welding fixture |
| CN116314365A (en) * | 2022-11-25 | 2023-06-23 | 青海黄河上游水电开发有限责任公司西宁太阳能电力分公司 | Segmented low-temperature welding strip, IBC battery string without main grid, battery assembly and packaging method of battery assembly |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN202332869U (en) * | 2011-08-30 | 2012-07-11 | 捷策节能科技（苏州）有限公司 | Back contact type solar cell piece and solar cell component |
| CN102592702A (en) * | 2012-02-28 | 2012-07-18 | 无锡市斯威克科技有限公司 | Dead-soft tin-coated copper belt for solar cell |
| CN202534655U (en) * | 2012-04-06 | 2012-11-14 | 深圳市华光达科技有限公司 | Novel solar battery photovoltaic solder strip device |
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