CN103144300A - Photovoltaic module and welding method of photovoltaic module - Google Patents
Photovoltaic module and welding method of photovoltaic module Download PDFInfo
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- CN103144300A CN103144300A CN2013100859006A CN201310085900A CN103144300A CN 103144300 A CN103144300 A CN 103144300A CN 2013100859006 A CN2013100859006 A CN 2013100859006A CN 201310085900 A CN201310085900 A CN 201310085900A CN 103144300 A CN103144300 A CN 103144300A
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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
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Abstract
The invention discloses a welding method of a photovoltaic module. The welding method comprises the steps of: placing a conductive tape between a welding strip and a main grid line of a battery piece, wherein the conductive tape is a metal foil or a piece of conductive cloth with two sides being provided with conductive back adhesive, and the melting temperature of the conductive back adhesive is below 400 DEG C; heating to enable the conductive back adhesive to be melted so as to bond the welding strip with the main grid line of the battery piece; and cooling to complete the welding process. During the welding process, the welding strip and the battery piece are bonded with each other by using the conductive tape, the temperature during the process is below 400 DEG C which is the welding temperature of the welding strip and the battery piece in the prior art, and the welding temperature in the welding process is lower than the welding temperature in the prior art to realize low-temperature bonding so as to relieve the phenomenon of uneven expansion and shrinkage between the welding strip and the battery piece, thus reducing stress generated in the welding process, and reducing the battery fragmentation rate in the welding process of the photovoltaic module. The invention also provides the photovoltaic module produced by using the welding method.
Description
Technical field
The present invention relates to the photovoltaic technology field, particularly relate to a kind of photovoltaic module and welding method thereof.
Background technology
Photovoltaic module can become electric energy with transform light energy, and the cell piece that is encapsulated in photovoltaic module is the photoelectric conversion unit of photovoltaic module.
When making photovoltaic module, first with welding, welding of battery film is become battery strings, then battery strings is laid between glass and backboard and connects with convergent belt, then carry out lamination, frame up.The making of photovoltaic module roughly comprises welding, lays, lamination, four operations frame up.
In welding sequence, the monolithic battery sheet is connected into battery strings with welding according to the both positive and negative polarity order.During welding, need high temperature with the tin melting layer on welding surface, bonding cell piece.Because material is different, the difference of the coefficient of thermal expansion and contraction of welding and cell piece is larger, and the coefficient of thermal expansion and contraction of welding is about 5 times of cell piece.
In welding process, need be heated to 400 degrees centigrade of left and right and melt the tin layer on welding surface, in high-temperature heating process, welding extends, and is bonding with cell piece during the tin melting layer on welding surface, cooling rear welding contraction, and in whole process, the change in size of cell piece is less, breathing between welding and cell piece is inhomogeneous, produces stress between making both, is easy to cause cell piece broken.The temperature of high-temperature heating is higher, and the inhomogeneous phenomenon of breathing is more serious, and the battery fragment rate of photovoltaic module is higher.
The cost of photovoltaic module is derived from cell piece more than 70%, the battery fragment rate is high, is unfavorable for cost control, and the battery fragment rate that therefore reduces photovoltaic module is that those skilled in the art are badly in need of the technical problem that solves at present.
Summary of the invention
The welding method that the purpose of this invention is to provide a kind of photovoltaic module, the battery fragment rate of the photovoltaic module of this welding method welding is lower.The present invention also provides a kind of photovoltaic module of being made by above-mentioned welding method.
In order to realize above-mentioned technical purpose, the invention provides a kind of welding method of photovoltaic module, comprise the following steps:
1) place conductive tape between the main grid line of welding and cell piece, conductive tape is metal forming or the conductive fabric that both sides all have the conduction gum, and the melt temperature of its conduction gum is lower than 400 degrees centigrade;
2) heating is melted the conduction gum of conductive tape;
3) cooling.
Preferably, step 2), the width of conductive tape equals the width of described welding.
Preferably, the melt temperature of the conduction gum of described conductive tape is 160 degrees centigrade.
Preferably, step 3) is the cooling or quenching of nature.
Preferably, described welding is the welding that base copper adds tin.
The present invention also provides a kind of photovoltaic module, comprise cell piece and welding, also comprise conductive tape, the main grid line of the bonding described welding of described conductive tape and described cell piece, described conductive tape is metal forming or the conductive fabric that both sides all have the conduction gum, and the melt temperature of described conduction gum is lower than 400 degrees centigrade.
Preferably, the width of described conductive tape equals the width of described welding.
Preferably, the melt temperature of the conduction gum of described conductive tape is 160 degrees centigrade.
Preferably, described welding is the welding that base copper adds tin.
At first the welding method of photovoltaic module provided by the invention, places conductive tape between the main grid line of welding and cell piece, conductive tape is metal forming or the conductive fabric that both sides all have the conduction gum, and the melt temperature of its conduction gum is lower than 400 degrees centigrade; Then, heating melts the conduction gum of conductive tape, the main grid line of bonding welding and cell piece; At last, cooling, namely completed welding process.
in welding process, with bonding with conductive tape between welding and cell piece, the melt temperature of the conduction gum of conductive tape is lower than 400 degrees centigrade, 400 degrees centigrade is the welding temperature of welding and cell piece in prior art, the gum that is heated in welding process conduct electricity melts, can realize being connected of welding and cell piece, welding temperature in this welding process is lower than welding temperature of the prior art, can realize low-temperature adhesion, alleviate the breathing non-uniform phenomenon between welding and cell piece, the stress that reduces to produce in welding process, reduce the battery fragment rate in the welding photovoltaic component process.
The present invention also provides a kind of photovoltaic module of being made by above-mentioned welding method, comprise cell piece, welding and conductive tape, the main grid line of the bonding welding of conductive tape and cell piece, conductive tape is metal forming or the conductive fabric that both sides all have the conduction gum, the melt temperature of conduction gum is lower than 400 degrees centigrade, and the battery fragment rate of this photovoltaic module is lower.
Description of drawings
Fig. 1 is the flow chart of a kind of specific embodiment of welding method of photovoltaic module provided by the present invention;
Fig. 2 is the side view of a kind of specific embodiment of cell piece of photovoltaic module provided by the present invention.
Wherein, the Reference numeral in Fig. 2 is as follows:
The specific embodiment
Core of the present invention is to provide a kind of welding method of photovoltaic module, and the battery fragment rate of the photovoltaic module of this welding method welding is lower.The present invention also provides a kind of photovoltaic module of being made by above-mentioned welding method.
In order to make those skilled in the art person understand better the solution of the present invention, the present invention is described in further detail below in conjunction with the drawings and specific embodiments.
Please refer to Fig. 1, Fig. 1 is the flow chart of a kind of specific embodiment of welding method of photovoltaic module provided by the present invention.
In a kind of concrete embodiment, the invention provides a kind of welding method of photovoltaic module, comprise the following steps:
Step S1 places conductive tape between the main grid line of welding and cell piece, conductive tape is metal forming or the conductive fabric that both sides all have the conduction gum, and the melt temperature of its conduction gum is lower than 400 degrees centigrade;
Step S2, heating is melted the conduction gum of conductive tape;
Step S3, cooling.
In this welding method, at first, place a slice cell piece, conductive tape is placed on the main grid line of cell piece, then welding is placed on conductive tape; Then, heating melts the conduction gum of conductive tape, the main grid line of bonding welding and cell piece; At last, cooling, namely completed the welding of welding and cell piece.
In welding process, with bonding with conductive tape between welding and cell piece, the melt temperature of the conduction gum of conductive tape is lower than 400 degrees centigrade, in prior art, the welding temperature of welding and cell piece is 400 degrees centigrade, the gum that is heated to conduct electricity in this welding process melts, and can realize being connected of welding and cell piece.Welding temperature in this welding method is lower than welding temperature of the prior art, can realize low-temperature adhesion, alleviate the breathing non-uniform phenomenon between welding and cell piece, the stress that reduces to produce in welding process reduces the battery fragment rate in the welding photovoltaic component process.
Welding process can be completed in the series welding machine, and cell piece, conductive tape and welding are placed in the series welding machine, and the series welding machine can heat it, and guarantees that in heating process the main grid line of welding and cell piece accurately locates.
A kind of preferred embodiment in, the width of conductive tape equals the width of welding, during the main grid line of the bonding welding of conductive tape and cell piece, can not be wider than welding and main grid line, also can be not narrow and affect current delivery between main grid line and welding.
Concrete, conductive tape can be metal forming or the conductive fabric that a kind of both sides all have high conduction gum, its conduction gum and conductive base form complete electric conductor, can form the electricity overlap joint in bonding mode with smooth surface.
Wherein, the polymer that comprises nickel, (methyl ethylidene) biphenol and (chloromethyl) oxirane in a kind of conduction gum.
The melt temperature of the conduction gum of conductive tape is lower than 400 degrees centigrade, and for example, melt temperature can be 160 degrees centigrade.When in prior art, welding and cell piece are bonding, need be heated to 400 degrees centigrade of left and right, the tin layer on welding surface could with the main grid line bonding of cell piece.Because material is different, the coefficient of thermal expansion and contraction of welding is about 5 times of cell piece, and temperature is higher, and the phenomenon of expanding with heat and contract with cold is more serious.Welding method provided by the invention only need be heated to 160 degrees centigrade and melt the conduction gum, can realize welding, has alleviated the phenomenon of expanding with heat and contract with cold in the welding process, has reduced the battery fragment rate of photovoltaic module.
In concrete embodiment, step S3 can adopt nature cooling, also can accelerate cooling velocity to the cell piece blowing of bonding welding.
In another preferred embodiment, can select base copper to add the welding of tin.In prior art, usually contain lead in the tin layer of the welding that photovoltaic module uses, plumbous effect is the fusing point that reduces welding, increases the mobility of tin layer, and welding can better be contacted with cell piece.Adopt low temperature to make the conductive tape fusing in the present invention, need not melt the tin layer of welding, need not in welding increases the alloys such as plumbous, silver-colored, can select base copper to add the welding of tin, effectively reduces the cost of welding.
Please refer to Fig. 2, Fig. 2 is the side view of a kind of specific embodiment of cell piece of photovoltaic module provided by the present invention.
The present invention also provides a kind of photovoltaic module, comprise cell piece 1, welding 2 and conductive tape 3, the main grid line 11 of the bonding welding 2 of conductive tape 3 and cell piece 1, conductive tape 3 all have metal forming or the conductive fabric of conduction gum for both sides, the melt temperature of conduction gum is lower than 400 degrees centigrade.
When the bonding welding 2 of conductive tape 3 and cell piece 1, compared with prior art, lower temperature can realize, low-temperature adhesion has been alleviated the breathing non-uniform phenomenon between welding 2 and cell piece 1, has reduced the battery fragment rate of photovoltaic module.
When making photovoltaic module, utilize the bonding welding 2 of conductive tape 3 and cell piece 1, cell piece 1 is connected into battery strings, then battery strings is laid between glass and backboard and connects with convergent belt, then carry out lamination, frame up.During cell piece 1 work, transform light energy is become electric energy, the electric energy that cell piece 1 produces passes to welding 2 by main grid line 11 through conductive tape 3, passes to convergent belt by welding 2, and is derived by convergent belt.
Concrete, the width of conductive tape 3 equals the width of welding 2, equal the width of the main grid line 11 of cell piece 1 due to the width of welding 2, the optimum width of conductive tape 3 equals the width of welding 2, can not be wider or narrower than welding 2 and main grid line 11, and affect the current delivery between main grid line 11 and welding 2.
Further in concrete embodiment, conductive tape 3 can be metal forming or the conductive fabric that a kind of both sides all have high conduction gum, and its conduction gum and conductive base form complete electric conductor, can form the electricity overlap joint in bonding mode with smooth surface.
The melt temperature of the conduction gum of conductive tape 3 can be 160 degrees centigrade lower than 400 degrees centigrade.When in prior art, welding 2 is bonding with cell piece 1, need be heated to 400 degrees centigrade of tin layers that melt welding 2 surfaces.The coefficient of thermal expansion and contraction of welding 2 is about 5 times of cell piece 1, and the temperature of heating is higher, and the phenomenon of expanding with heat and contract with cold is more serious.Photovoltaic module provided by the invention during welding, only need be heated to 160 degrees centigrade and melt the conduction gum, has alleviated the phenomenon of expanding with heat and contract with cold in the welding process, and the battery fragment rate of this photovoltaic module is lower.
In another kind of concrete embodiment, this photovoltaic module can select base copper to add the welding 2 of tin, and welding 2 need not to increase the fusing point that lead reduces the surperficial tin layer of welding 2.
In prior art, leaded in the tin layer of welding 2, in the process of using welding 2, because fusion temperature is higher, there is a large amount of plumbous boil-off gas to overflow, directly affect the healthy of operating personnel.The scolder waste residue that produces in work and scrap or service life overdue battery component all contain lead, very big to the pollution of environment.Compared with prior art, the welding 2 that uses in this photovoltaic module need not to increase the alloys such as plumbous, silver-colored, can effectively reduce on the one hand the cost of welding 2, can reduce again on the other hand the pollution to environment.
Above photovoltaic module provided by the present invention and welding method thereof are described in detail.Used specific case herein principle of the present invention and embodiment are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof.Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention, can also carry out some improvement and modification to the present invention, these improvement and modification also fall in the protection domain of claim of the present invention.
Claims (9)
1. the welding method of a photovoltaic module comprises the following steps:
1) place conductive tape between the main grid line of welding and cell piece, conductive tape is metal forming or the conductive fabric that both sides all have the conduction gum, and the melt temperature of its conduction gum is lower than 400 degrees centigrade;
2) heating is melted the conduction gum of conductive tape;
3) cooling.
2. the welding method of photovoltaic module as claimed in claim 1, is characterized in that step 2) described in the width of conductive tape equal the width of described welding.
3. the welding method of photovoltaic module as claimed in claim 2, is characterized in that, the melt temperature of the conduction gum of described conductive tape is 160 degrees centigrade.
4. the welding method of photovoltaic module as claimed in claim 3, is characterized in that, step 3) is the cooling or quenching of nature.
5. the welding method of photovoltaic module as claimed in claim 4, is characterized in that, described welding is the welding that base copper adds tin.
6. photovoltaic module, comprise cell piece (1) and welding (2), it is characterized in that, also comprise conductive tape (3), the main grid line (11) of the bonding described welding of described conductive tape (3) (2) and described cell piece (1), described conductive tape (3) all has metal forming or the conductive fabric of conduction gum for both sides, the melt temperature of described conduction gum is lower than 400 degrees centigrade.
7. photovoltaic module as claimed in claim 6, is characterized in that, the width of described conductive tape (3) equals the width of described welding (2).
8. photovoltaic module as claimed in claim 7, is characterized in that, the melt temperature of the conduction gum of described conductive tape (3) is 160 degrees centigrade.
9. photovoltaic module as claimed in claim 8, is characterized in that, described welding (2) adds the welding of tin for base copper.
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| CN2013100859006A CN103144300A (en) | 2013-03-18 | 2013-03-18 | Photovoltaic module and welding method of photovoltaic module |
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Cited By (8)
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| CN104600158A (en) * | 2015-01-13 | 2015-05-06 | 福建铂阳精工设备有限公司 | Interconnection method of crystalline silicon battery assembly |
| WO2016131222A1 (en) * | 2015-02-16 | 2016-08-25 | 保定市易通光伏科技有限公司 | Photovoltaic component and manufacturing method thereof |
| CN106252435A (en) * | 2015-06-11 | 2016-12-21 | 3M创新有限公司 | Solar module |
| CN107768473A (en) * | 2017-09-27 | 2018-03-06 | 江阴艾能赛瑞能源科技有限公司 | Solar energy laminated batteries and its welding method |
| CN107887477A (en) * | 2017-12-11 | 2018-04-06 | 无锡奥特维科技股份有限公司 | A kind of cell piece string welding machine and cell piece series welding method |
| CN114078983A (en) * | 2020-08-10 | 2022-02-22 | 苏州阿特斯阳光电力科技有限公司 | Photovoltaic module |
| CN116673645A (en) * | 2023-06-12 | 2023-09-01 | 无锡市斯威克科技有限公司 | Photovoltaic module welding mode |
| CN108365043B (en) * | 2018-04-24 | 2023-09-22 | 通威太阳能（合肥）有限公司 | Interconnection structure of photovoltaic cell piece subassembly |
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| CN116673645A (en) * | 2023-06-12 | 2023-09-01 | 无锡市斯威克科技有限公司 | Photovoltaic module welding mode |
| CN116673645B (en) * | 2023-06-12 | 2023-12-12 | 无锡市斯威克科技有限公司 | Photovoltaic module welding method |
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Application publication date: 20130612 |