CN102983195A - Solder strip for back-contact solar cell - Google Patents

Solder strip for back-contact solar cell Download PDF

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Publication number
CN102983195A
CN102983195A CN2012104845065A CN201210484506A CN102983195A CN 102983195 A CN102983195 A CN 102983195A CN 2012104845065 A CN2012104845065 A CN 2012104845065A CN 201210484506 A CN201210484506 A CN 201210484506A CN 102983195 A CN102983195 A CN 102983195A
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China
Prior art keywords
welding
solar cell
contact solar
solder strip
insulating barrier
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CN2012104845065A
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Chinese (zh)
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CN102983195B (en
Inventor
戴建方
沈坚
王栩生
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CSI Solar Technologies Inc
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CSI Solar Technologies Inc
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy

Abstract

The invention discloses a solder strip for a back-contact solar cell. The solder strip comprises a conductive solder strip body, insulating layers are arranged on front and back sides of the conductive solder strip body, conductive holes matching with a hole metal electrode area of the back-contact solar cell are arranged on the insulating layer on the front side of the conductive solder strip body, and heat conduction holes corresponding to the conductive holes respectively are arranged on the insulating layer on the back side of the conductive solder strip body; and metal welding coatings are arranged in the conductive holes. The invention further discloses a novel solder strip dedicated for the back-contact solar cell, welding can be performed directly on the back-contact solar cell, and no extra technology is needed to separate a cathode and an anode of a cell piece, so that the production technology is simplified, and the solder strip is particularly applicable to automatic welding of production lines.

Description

A kind of welding for back contact solar cell
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, obtained develop rapidly.Yet with respect to traditional energy, the cost of electricity-generating of photovoltaic generation is still higher.In order further to reduce cost, a kind of important mode is to adopt high-efficiency battery, high-efficiency battery can produce more electric power in unit are, thereby having reduced expensive silicon material uses, and reduced the shared erection space of system component, thereby improved on the whole income, reduced the cost of photovoltaic generation.
Back contact solar cell is one of most important high-efficiency battery that at present can large-scale production.Compare with common crystal silicon solar energy battery, the positive pole of back contact solar cell and negative pole all are located at the back side of cell piece, and both positive and negative polarity connects by welding, and welding affects without shading cell piece, thereby can reduce the shading of cell piece, improve the conversion efficiency of cell piece.
The back side of back contact solar cell comprises plurality of holes metal electrode bonding pad (the mesoporous metal electrode generally is array distribution) and non-mesoporous metal electrode district, it is the back surface field zone, because mesoporous metal electrode bonding pad and back surface field zone are electrically opposite, and adopt traditional welding to carry out when interconnected, because traditional welding is a common metal tape (such as the copper strips with tin coating), therefore directly all conduct electricity on its two sides, can cause the surface of the non-weld zone of welding to contact with non-mesoporous metal electrode district after the welding and be short-circuited.
For the problems referred to above, existing method is to use insulation strip to isolate between welding and non-mesoporous metal electrode district, the insulation strip of using is (such as the EPE dielectric film, consisted of by the EVA/PET/EVA trilamellar membrane) need to be cut in advance the shape that is fit to mesoporous metal electrodes series and welding, simultaneously need to perforate on respect to the insulation strip of the position of mesoporous metal electrode district, so that the welding of welding and mesoporous metal electrode district.Obviously, this method can only manual operation, wastes time and energy, and cost is higher.
Summary of the invention
The object of the invention provides 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, also be provided with the conductive hole that cooperates with the mesoporous metal electrode district of back contact solar cell on the insulating barrier in conduction welding body front
The insulating barrier at the described conduction welding body back side is provided with and described conductive hole thermal hole one to one;
Be provided with the metal solder coating in the described conductive hole.
Above, described conduction welding body can adopt prior art, for example oxygen-free copper stripe.
The effect of described conductive hole is used for 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 is to carry out heat conduction in welding process, so that the metal solder in the conductive hole of welding another side is coated with the melting layer welding.
In the technique scheme, be full of in the described thermal hole and be provided with the metal solder coating.
In the 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 be correspondence and center superposition one by one.
In the technique scheme, the both sides of described conduction welding body are provided with insulating barrier.Be that two sides on the thickness direction of welding also are provided with insulating barrier, with further parcel conduction welding body, prevent that it from descending because oxidation causes electrical property.
Preferred technical scheme, described insulating barrier is the insulation enamelled coating.Insulating varnish can be one or more in polyester, polyurethane, nylon, the polyimides.
The material of described insulating barrier can only contain organic and/or inorganic materials or organic material, also can be two kinds mixing or compound.For example, when adopting inorganic material, can adopt mica, asbestos, when adopting organic material, can in insulating varnish, insulating cement, dielectric film, insulating paper, glass fiber, the rubber one or more; Dielectric film can be one or more in polyester film, polyacrylic acid film, polyamide, polyimides, the nylon.
Described insulating barrier can be one deck, also can be multilayer.
The preparation method of above-mentioned welding can adopt following steps:
1) form insulating barrier by dip-coating, spraying, printing, one or more methods in wrapped at conduction welding body (such as the flat copper band), insulating barrier can apply and be bonded on the conduction welding body;
2) in the thermal hole at the conductive hole in conduction welding body front and the back side, form the metal solder coating by spraying, brushing, immersion plating, wicking, spray tin, tin brush plating, one or more methods in tin, paste solder printing, the tin cream spray printing of pressing.
Certainly, can form first insulating barrier, rear formation metal solder coating on the conduction welding body; Also can form first the metal solder coating, form again insulating barrier.
Because the employing of technique scheme, compared with prior art, the present invention has following advantage:
1. the present invention has developed a kind of new welding that is specifically designed to back contact solar cell, it can directly carry out welding operation at back of the body contact cell piece, and do not need extra technique so that the both positive and negative polarity isolation of cell piece, thereby simplified production technology, be particularly suitable for the automatic welding of streamline, greatly improve production efficiency, obtained significant effect, had positive realistic meaning.
2. the present invention is equipped with insulating barrier at the obverse and reverse of conduction welding body, has increased the pliability of welding; For existing welding, welding of the present invention utilizes insulating barrier to replace the part metals coating, thereby can relatively reduce the use of metal coating, has reduced the manufacturing cost of assembly integral body.
3. welding of the present invention is easy to preparation, and cost is lower, is suitable for applying.
Description of drawings
Fig. 1 is the partial top view of the embodiment of the invention one;
Fig. 2 is the partial sectional view of the embodiment of the invention one; (the metal solder coating does not draw)
Fig. 3 is the partial sectional view of the embodiment of the invention one.
Wherein: 1, conduction welding body; 2, insulating barrier; 3, conductive hole; 4, thermal hole; 5, metal solder coating.
Embodiment
The invention will be further described below in conjunction with embodiment:
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, also be provided with the conductive hole 3 that cooperates with the mesoporous metal electrode district of back contact solar cell on the insulating barrier in conduction welding body front
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 be correspondence and center superposition one by one;
Be provided with metal solder coating 5 in the described conductive hole.Be full of in the described thermal hole and be provided with the metal solder coating.Described metal solder coating is the tin lead finish.
The both sides of described conduction welding body are provided with insulating barrier.Described insulating barrier is the insulation enamelled coating.
The concrete preparation method of above-mentioned welding is as follows:
Take wide cut as 36 mm, thickness as 0.2 micron oxygen-free copper stripe as conduction welding body; Adopting the R-831-S epoxy resin enamel is insulating varnish, and wherein, epoxy glue: curing agent: diluent fully mixes by the mass ratio of 3:1:1;
Then epoxy resin enamel is printed on the conduction welding body by the pattern of MWT battery hole metal electrode distribution, and conduction welding body solidifies about 10min by curing oven under 70 ~ 80 ℃;
Republish the another side of Copper Foil behind the epoxy resin enamel surface cure on the conduction welding body, guarantee conductive hole and the thermal hole center-aligned of two-side graph on the Copper Foil during printing; Behind the epoxy resin enamel surface cure of conduction welding body another side,
Conduction welding body cuts into the flat copper band by the wide cut of 4 mm, fully solidifies after the both sides of flat copper band apply epoxy resin enamel simultaneously again;
Then with above-mentioned flat copper band with the tin stove of wicking mode by the plumbous liquid of the tin that fusing is housed, the flat copper band is by about 20 s of time of tin stove, behind the tin stove, do not have the position (being in conductive hole and the thermal hole) of the upper epoxy resin enamel of printing to form about 20 ~ 50 microns metal solder coating (tin layer) of one deck on the flat copper band, the concrete thickness of tin layer can be regulated by the speed that the flat copper band is crossed the tin stove; Just can weld directly after the welding of above-mentioned formation is cut by certain-length and use.
Embodiment two
A kind of welding for back contact solar cell, take wide cut as 3 millimeters, thickness as 0.2 millimeter oxygen-free copper stripe as conduction welding body; Adopt wide cut be 7 millimeters polyimides high temperature bond film as insulating barrier, this adhesive film temperature resistant grade is 300 degree, about 50 microns of thickness; Pb-Sn paste is arranged as welding paste with FLY801-T3;
Prolong on the center line of polyimides high temperature membrane the pattern perforate by the mesoporous metal distribution of electrodes of back contact solar cell, then the hole center-aligned of two membranes up and down is fitted in simultaneously on the conduction welding body, and makes its bonding being adjacent to by suitable pressure;
Dielectric film opening area central point is all coated tin cream on conduction welding body two sides, then about 10 mg are 220 ℃ of reflow solderings by temperature, continue 60 seconds, after being heated and melting, tin cream because of on its good wetting and spreading uniform spreading welding bulk copper, forms the metal solder coating.

Claims (6)

1. welding that is used 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 equipped with insulating barrier (2), also be provided with the conductive hole (3) that cooperates with the mesoporous metal electrode district of back contact solar cell on the insulating barrier in conduction welding body front
The insulating barrier at the described conduction welding body back side is provided with and described conductive hole thermal hole (4) one to one;
Be provided with metal solder coating (5) in the described conductive hole.
2. the welding for back contact solar cell according to claim 1 is characterized in that: be full of in the described thermal hole and be provided with the 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, it is characterized in that: described conductive hole and thermal hole be correspondence and center superposition one by one.
5. the welding for back contact solar cell according to claim 1, it 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 the insulation enamelled coating.
CN201210484506.5A 2012-11-23 2012-11-23 A kind of welding for back contact solar cell Active CN102983195B (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
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
CN105826407A (en) * 2016-03-21 2016-08-03 无锡携创新能源科技有限公司 Back contact technology battery assembly and manufacturing method thereof
CN106328746A (en) * 2015-06-30 2017-01-11 上海比亚迪有限公司 Photovoltaic welding tape and preparation method
CN106653910A (en) * 2016-12-23 2017-05-10 中利腾晖光伏科技有限公司 Photovoltaic welding strip 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

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Cited By (9)

* Cited by examiner, † Cited by third party
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
CN105826407A (en) * 2016-03-21 2016-08-03 无锡携创新能源科技有限公司 Back contact technology battery assembly and manufacturing method thereof
CN106653910A (en) * 2016-12-23 2017-05-10 中利腾晖光伏科技有限公司 Photovoltaic welding strip 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

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