CN111906467A - Solar cell string welding method, cell module and welding device - Google Patents
Solar cell string welding method, cell module and welding device Download PDFInfo
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- CN111906467A CN111906467A CN202010831987.7A CN202010831987A CN111906467A CN 111906467 A CN111906467 A CN 111906467A CN 202010831987 A CN202010831987 A CN 202010831987A CN 111906467 A CN111906467 A CN 111906467A
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- 238000003466 welding Methods 0.000 title claims abstract description 204
- 238000000034 method Methods 0.000 title claims abstract description 33
- 239000000853 adhesive Substances 0.000 claims abstract description 37
- 230000001070 adhesive effect Effects 0.000 claims abstract description 37
- 238000010438 heat treatment Methods 0.000 claims abstract description 21
- 238000001723 curing Methods 0.000 claims abstract description 15
- 239000011248 coating agent Substances 0.000 claims abstract description 5
- 238000000576 coating method Methods 0.000 claims abstract description 5
- 238000005476 soldering Methods 0.000 claims description 24
- 230000007547 defect Effects 0.000 claims description 20
- 239000000463 material Substances 0.000 claims description 18
- 230000007246 mechanism Effects 0.000 claims description 15
- 229910000679 solder Inorganic materials 0.000 claims description 14
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 11
- 239000003292 glue Substances 0.000 claims description 11
- 229910052709 silver Inorganic materials 0.000 claims description 11
- 239000004332 silver Substances 0.000 claims description 11
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 8
- 229910052802 copper Inorganic materials 0.000 claims description 8
- 239000010949 copper Substances 0.000 claims description 8
- 238000005507 spraying Methods 0.000 claims description 8
- 239000004020 conductor Substances 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 6
- 238000005516 engineering process Methods 0.000 claims description 5
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 3
- 239000011347 resin Substances 0.000 claims description 3
- 229920005989 resin Polymers 0.000 claims description 3
- 239000004593 Epoxy Substances 0.000 claims description 2
- 229920001296 polysiloxane Polymers 0.000 claims description 2
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000004907 flux Effects 0.000 description 10
- 239000012634 fragment Substances 0.000 description 9
- 238000007639 printing Methods 0.000 description 7
- 238000005452 bending Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 229910000597 tin-copper alloy Inorganic materials 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical group [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 230000008602 contraction Effects 0.000 description 2
- 238000002503 electroluminescence detection Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 229910021419 crystalline silicon Inorganic materials 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005401 electroluminescence Methods 0.000 description 1
- 125000003700 epoxy group Chemical group 0.000 description 1
- 238000013007 heat curing Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910021421 monocrystalline silicon Inorganic materials 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000012858 packaging process Methods 0.000 description 1
- 238000013082 photovoltaic technology Methods 0.000 description 1
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000001029 thermal curing Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
-
- 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
- H01L31/18—Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof
- H01L31/1876—Particular processes or apparatus for batch treatment of the devices
-
- 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
- H01L31/18—Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof
- H01L31/1876—Particular processes or apparatus for batch treatment of the devices
- H01L31/188—Apparatus specially adapted for automatic interconnection of solar cells in a module
-
- 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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- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Electromagnetism (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Mechanical Engineering (AREA)
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- Photovoltaic Devices (AREA)
Abstract
The invention discloses a solar cell string welding method, a solar cell module and a welding device, and relates to the technical field of solar cell welding. The welding method comprises the steps of welding and connecting a plurality of battery pieces into a first part of a battery string; welding and connecting a plurality of battery pieces to form a second part of the battery string; coating conductive adhesive on the grid lines and/or the first welding strips on one side of the first part and the second part of the battery string; and heating, curing and welding the first part of the battery string and the second part of the battery string with the first welding strip through conductive adhesive to form a complete battery string. The solar cell string welding method, the solar cell module and the welding device provided by the invention can improve the cell efficiency, are beneficial to realizing the automation of cell welding and reduce the cost.
Description
Technical Field
The invention relates to the technical field of solar cell welding, in particular to a solar cell string welding method, a solar cell module and a welding device.
Background
The development of photovoltaic technology has driven the growth of solar cell-related industries, and the demand for solar cell devices has also increased. In the production process of the solar cell module, the cell pieces need to be welded by welding strips or laminated to form cell strings, and then the cell strings are orderly arranged and connected by welding strips to form the cell module. The solder strip is also called tin-plated copper strip or tin-plated copper strip, and is divided into bus bar and interconnecting bar.
At present, when welding the welding strip to the battery string grid, the traditional welding mode is: a plurality of welding points are prepared on the battery strings through printing, and welding tapes are welded on the welding points through soldering flux so as to realize connection among the plurality of battery strings. However, when such a welding method is adopted, there are the following problems: welding strips on each welding point manually, so that automatic welding cannot be realized, and the efficiency is low; the welding points are usually made of a large amount of silver materials, so that the cost is high; the welding points need to be more in number, and can cover the surface of a cell with a certain area, so that the photoelectric conversion efficiency of the cell is reduced.
Therefore, there is a need for a solar cell string soldering method that can save cost, improve cell efficiency, and facilitate automation.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention mainly aims to provide a solar cell string welding method, a cell module and a welding device, which can improve the cell efficiency, facilitate the automation of cell welding and reduce the cost.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a solar cell string welding method comprises the following steps:
welding and connecting a plurality of battery pieces to form a first part of a battery string;
welding and connecting a plurality of battery pieces to form a second part of the battery string;
coating conductive adhesive on the grid lines and/or the first welding strips on one side of the first part and the second part of the battery string;
and heating, curing and welding the first part of the battery string and the second part of the battery string with the first welding strip through conductive adhesive to form a complete battery string.
Optionally, the plurality of first solder strips are connected by welding through the second solder strips and packaged to form the solar cell module.
Optionally, welding a plurality of battery plates to form a first part of the battery string by using a shingle technology.
Optionally, welding a plurality of battery plates to form a second part of the battery string by using a shingle technology.
Optionally, the conductive paste includes a base material and a conductive material doped in the base material, the base material is cured when heated, the base material includes any one of epoxy, acrylic, silicone or hybrid, and the conductive material is any one of silver, copper and silver-coated copper.
Optionally, when heating, curing and welding are performed, the welding heating temperature of the conductive adhesive is 100-220 ℃, and the welding time is 1-50 s.
Optionally, the distance between two battery pieces connected by the first welding strip is not more than 5 mm.
Optionally, the method further comprises the steps of: detecting whether welding defects and/or battery string defects exist.
The invention also provides a solar cell module which comprises a plurality of cell strings, wherein each cell string comprises a plurality of mutually connected cell sheets, the cell sheets are provided with grid lines, and the grid line on one side of at least one cell sheet and the adjacent cell sheet are welded with the first welding strip through conductive adhesive in a heating, curing and welding mode.
The invention also provides a solar cell string welding device, which comprises
The glue spraying device is used for spraying conductive glue on the grid lines and the welding strips of the battery strings;
the placing device is used for placing the welding strip on a grid line of the battery string;
the conveying device is used for conveying the battery string and the welding strip to the welding mechanism;
the welding mechanism is used for heating the conductive adhesive to solidify the conductive adhesive and welding a welding strip to the grid line of the battery string;
and the detection mechanism is used for detecting whether welding defects and battery string defects exist after welding is finished.
According to the solar cell string welding method provided by the invention, the first part of the cell string and the second part of the cell string are welded with the first welding strips through heating and curing by adopting the conductive adhesive to form a complete cell string, and the first welding strips of the plurality of cell strings are welded and connected through the second welding strips, so that the process steps of printing and preparing welding points on the cell string and manually welding the welding strips on the welding points are avoided, the automatic welding of the cell string is facilitated, and the problems of high cost of silver materials caused by printing and preparing the welding points and reduction of cell efficiency caused by shielding and covering the surfaces of the cell pieces by the welding points are avoided.
The invention provides a solar cell module which comprises a plurality of cell strings, wherein each cell string comprises a plurality of mutually connected cell sheets, grid lines are arranged on the cell sheets, and the grid line on one side of at least one cell sheet and the adjacent cell sheet are welded with a first welding strip through heating, curing and conducting resin. Through conducting resin and the first welding strip heating solidification welding, can avoid the too big fragment problem that leads to of bending rate that longer battery cluster leads to (adopt scaling powder and welding strip welding, because the material that the welding strip adopted is the tin-copper alloy, the material of battery piece is silicon, it is great with battery piece coefficient of thermal expansion difference to weld the strip, during the cooling shrinkage, the battery piece can produce certain bending rate, and because the shrinkage of both is great, easily tear the battery piece, produce the fragment, lead to the fragment rate higher).
The solar cell string welding device provided by the invention can be used for realizing automatic welding of the solar cell string without manually carrying out a welding process of a welding strip and a welding point on the cell string.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a solar cell;
fig. 2 is a schematic structural diagram of a solar cell string in the prior art;
fig. 3 is a schematic structural view of a battery assembly according to the battery string shown in fig. 2 after welding by means of a welding strip;
fig. 4 is a schematic structural diagram of a solar cell string provided by the present invention;
FIG. 5 is a schematic structural view of two battery strings welded by a second welding strip according to FIG. 4;
FIG. 6 is a schematic structural view of the battery string shown in FIG. 4 welded by a second welding strip;
fig. 7 is a schematic view of the structure of the battery string according to fig. 4;
fig. 8 is a schematic flow chart of a solar cell string welding method provided by the present invention;
fig. 9 is a schematic structural diagram of a solar cell string welding apparatus provided by the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The inventors of the present invention found that: as shown in fig. 1 to 3, in the conventional welding between solar cell strings, a plurality of silver welding points 21 are generally prepared on the back surface of the solar cell string 2 by printing, and then a welding strip 3 is manually welded to each welding point 21. It has the disadvantages of low welding efficiency, high cost and low battery efficiency. Meanwhile, when the soldering strip 3 is soldered by the soldering flux, the difference between the thermal expansion coefficients of the soldering strip 3 (usually tin-copper alloy) and the battery piece 1 (monocrystalline silicon or polycrystalline silicon) is large, so that the shrinkage difference between the soldering strip 3 and the battery piece 1 is large during cooling shrinkage, the soldering flux is difficult to deform, and the battery string 2 is easy to pull open. In order to solve the problem, the inventor proposes the technical scheme of the invention, namely, conducting adhesive and solder strips are adopted between the battery strings 2 to carry out heating, curing and welding so as to avoid the problem caused by the welding points 21, thus being beneficial to realizing automatic welding, improving the battery efficiency and reducing the cost; and through improving traditional scaling powder into conductive adhesive, utilize the conductive adhesive to have certain elasticity after the solidification, can take place deformation under the pulling force, compensate and weld the difference of the shrinkage of area and battery piece 1, avoid pulling the battery piece 1 during the welding, reduced the fragment rate.
As shown in fig. 8, a solar cell string soldering method provided by the present invention may generally include the following steps:
welding and connecting a plurality of battery plates 1 into a first battery string part 22;
welding and connecting a plurality of battery pieces 1 into a battery string second part 23;
coating conductive adhesive on the grid lines 11 and/or the first solder strips 4 on one side of the first part 22 and the second part 23 of the battery string;
the first cell string part 22 and the second cell string part 23 are welded with the first welding strip 4 through conductive adhesive in a heating curing mode to form a complete cell string 2.
Specifically, the structure of the battery piece 1 is as shown in fig. 1, silver grid lines are prepared on the surface of the battery piece 1 by printing, and one grid line 11 is prepared on the surface of one side of the battery piece 1 for welding with the adjacent battery piece 1. When welding is carried out through the imbrication technology, the edges of the plurality of battery pieces 1 are overlapped in sequence to be welded, so that the battery string 2 is formed. In the invention, a plurality of battery pieces 1 are welded to form a first part 22 of a battery string, and a plurality of battery pieces 1 are welded to form a second part 23 of the battery string, namely the battery string is welded by adopting a tiling technology, and during welding, conductive adhesive is coated on grid lines 11 of the battery pieces 1, then the battery pieces are stacked on adjacent battery pieces, and are heated and cured, so that the welding connection can be realized.
It should be understood that when the plurality of battery plates 1 are welded to connect the battery string first portion 22 and the plurality of battery plates 1 are welded to connect the battery string second portion 23, other welding methods may be used to achieve the welding connection between the battery plates.
In the present invention, a complete battery string 2 is not limited to only the battery string first part 22 and the battery string second part 23, but may be more. Such as a battery string first portion, a battery string second portion, a battery string third portion, … … battery string nth portion, where N is an integer, and so forth. Optionally, the first part of the battery string, the second part of the battery string, the third part of the battery string and the nth part of the … … battery string are all small battery strings, two adjacent small battery strings are welded by conductive adhesive and a first welding strip through heating and curing, the small battery strings are connected to form a complete battery string 2, and at this time, the complete battery string 2 is a long battery string. As shown in fig. 6 and 7, a complete battery string 2 including 3 parts is formed by heat curing and welding the conductive adhesive and the first welding strip 4.
Conductive paste is coated on the grid lines 11 and/or the first solder strips 4 on one side of the first part 22 and the second part 23 of the battery string. The conductive adhesive comprises a base material and a conductive material doped in the base material. The substrate will cure when heated (100 ℃ C. and 220 ℃ C.). The base material of the conductive adhesive adopted by the invention can be any adhesive material including epoxy group, acrylic group, silicon base or hybrid group. The doped conductive material can be any one of silver, copper and silver-coated copper. According to the invention, the traditional soldering flux is improved into the conductive adhesive, and the conductive adhesive has certain elasticity after being cured and can deform under tension, so that the difference between the shrinkage of the welding strip 4 and the shrinkage of the battery piece 1 is made up, the battery piece 1 is prevented from being broken during welding, and the breakage rate is reduced.
As shown in fig. 5-7, the first part 22 and the second part 23 of the battery string are welded to the first welding strip 4 by thermal curing through conductive adhesive to form a complete battery string 2. When heating, curing and welding are carried out, the welding heating temperature of the conductive adhesive is 100-220 ℃, and the welding time is 1-50 s. Through the low-temperature welding (lower than 220 ℃) of the conductive adhesive, the problems that the battery performance is reduced due to the high temperature of infrared heating in the traditional soldering flux welding process or the preparation process of the solar battery with a partial structure needs to be carried out in a low-temperature state are solved. Optionally, the distance L between two adjacent battery pieces 1 connected by the first solder strips 4 is not greater than 5 mm. When the traditional soldering process is carried out through the soldering flux and the soldering strips 3, the distance L between two adjacent battery pieces 1 at least needs to be larger than 10mm due to the fact that the soldering flux needs to carry out high-temperature soldering, and due to the fact that the thermal expansion coefficients of the soldering strips 3 and the battery pieces 1 are large in difference, when the soldering strips 3 and the battery pieces 1 are cooled and shrunk, the shrinkage difference is large, the battery pieces are prone to being broken, and fragments are generated. In the invention, in order to improve the efficiency of the battery assembly, the size of the L is reduced as much as possible, and the conductive adhesive is adopted to replace soldering flux, so that low-temperature welding is realized, the size of the L is reduced, the gap in the battery assembly is minimized, the problems of fragment and overlarge bending rate caused by large difference of shrinkage are avoided, and the battery efficiency is improved.
As shown in fig. 5 and 6, in the solar cell string soldering method provided by the present invention, after the complete cell string 2 is prepared, the second solder strip 5 can be soldered to the first solder strip 4 of the plurality of cell strings 2, so as to connect the plurality of cell strings to form an array of cell strings 2. And then, packaging the battery string array to form the solar battery assembly.
Further, the solar cell string welding method provided by the invention further comprises the following steps: the presence of a welding defect and/or a battery string defect is detected by an EL detector (electroluminescence detection). The EL detector utilizes the electroluminescence principle of crystalline silicon, utilizes a high-resolution infrared camera to shoot near-infrared images of the components, and obtains and judges the defects of the components.
According to the solar cell string welding method provided by the invention, the first cell string part 22 and the second cell string part 23 are welded with the first welding strips 4 through heating and curing by adopting the conductive adhesive to form the complete cell string 2, and the first welding strips 4 of the plurality of cell strings 2 are welded and connected through the second welding strips 5, so that the process steps of printing and preparing the welding points 21 on the cell strings 2 and manually welding the welding strips 3 on the welding points 21 are avoided, the automatic welding of the cell strings 2 is facilitated, and the problems of expensive silver material cost caused by printing and preparing the welding points 21 and battery efficiency reduction caused by shielding and covering the surface of the cell sheet 1 by the welding points 21 are avoided.
As shown in fig. 5 to 6, the present invention also provides a solar cell module. The solar cell module comprises a plurality of cell strings 2. The battery string 2 comprises a plurality of battery plates 1 which are connected with each other. Grid lines 11 are arranged on the battery piece 1. The grid line of one side of at least one battery piece 1 in the battery string 2 and the adjacent battery piece 1 are welded with the first welding strip 4 through conductive adhesive in a heating curing mode. As shown in fig. 7, which is a schematic structural diagram of one of the battery strings 2. The welding connection of the battery string 2 and the battery string 2 is realized by coating the grid line 11 of one battery piece of the battery string 2 or the first welding strip 4 with conductive adhesive and then heating and curing. The first welding strips 4 of the plurality of battery strings 2 are welded and connected through the second welding strips 5 to form a battery string array, and then the solar battery assembly can be manufactured through a packaging process. The welding between the first welding strip 4 and the second welding strip 5 can be flux welding or direct welding, because the first welding strip 4 and the second welding strip 5 are made of metal materials such as tin-copper alloy and the like, the contraction performance is consistent, the welding is easy, and the contraction performance is not required to be considered during welding.
According to the solar cell module provided by the invention, the conductive adhesive is heated, cured and welded with the first welding strip 4, so that the problem of fragment caused by overlarge bending rate due to a longer cell string 2 can be solved (soldering flux and the welding strip are adopted for welding, the welding strip is made of tin-copper alloy, the cell is made of silicon, the difference between the thermal expansion coefficients of the welding strip and the cell is large, the cell can generate a certain bending rate during cooling shrinkage, and the cell is easy to be pulled to be broken due to large difference between the shrinkage amounts of the welding strip and the cell, so that the fragment rate is high).
As shown in fig. 9, the invention further provides a solar cell string welding device, which includes a glue spraying device 100, a placing device 200, a conveying device 300, a welding mechanism 400, and a detection mechanism 500. The glue spraying device 100 is used for spraying conductive glue on the grid lines 11 and the first solder strips 4 of the battery piece 1. The placement device 200 is used to place the first solder ribbon 4 on the grid of the battery string 2. The conveying device 3 is used for conveying the battery string 2 and the first welding strip 4 to the welding mechanism 400. The welding mechanism 400 is used to heat the conductive adhesive to cure the conductive adhesive, and weld the first welding strip 4 to the grid line of the battery string 2. The detection mechanism 500 is used for detecting whether welding defects and battery string defects exist after welding is completed. According to the solar cell string welding device provided by the invention, the glue spraying device 100 sprays the conductive glue on the grid line of the cell string 2 and the first welding strip 4, then the placing device 200 places the first welding strip 4 on the grid line of the cell string 2, then the cell string 2 and the first welding strip 4 are conveyed to the welding mechanism 400, and the welding mechanism 400 heats the conductive glue to solidify the conductive glue, so that the first welding strip 4 is welded on the grid line of the cell string 2.
The detection mechanism 5 is used for detecting whether welding defects and battery string defects exist. The welding defects comprise missing welding, cold welding and the like, and the battery string defects comprise fragments and hidden cracks. After welding, the welded battery string is moved to the station for EL detection, and the welding defects such as missing welding, insufficient welding and the like are detected, and the defects such as broken pieces, hidden cracks and the like caused by overlarge pressure or uneven pressure of a welding head can also be detected. And after detection, discharging through a string moving mechanism.
The solar cell string welding device provided by the invention can be used for realizing automatic welding of the solar cell string without manually carrying out the welding process of the welding point 21 on the welding strip 3 and the cell string 2.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A solar cell string welding method is characterized by comprising the following steps:
welding and connecting a plurality of battery pieces to form a first part of a battery string;
welding and connecting a plurality of battery pieces to form a second part of the battery string;
coating conductive adhesive on the grid lines and/or the first welding strips on one side of the first part and the second part of the battery string;
and heating, curing and welding the first part of the battery string and the second part of the battery string with the first welding strip through conductive adhesive to form a complete battery string.
2. The method of claim 1, wherein the first solder ribbons are connected by soldering via the second solder ribbons, and packaged to form the solar cell module.
3. The method for welding the solar cell string according to claim 1 or 2, wherein a plurality of cell pieces are welded and connected to form the first part of the cell string by using a shingle technology.
4. The method for welding the solar cell string according to claim 1 or 2, wherein a plurality of cell pieces are welded and connected to form the second part of the cell string by using a shingle technique.
5. The solar cell string welding method according to claim 1 or 2, wherein the conductive paste comprises a base material and a conductive material doped in the base material, the base material is cured when heated, the base material comprises any one of an epoxy-based, an acrylic-based, a silicone-based or a hybrid-based paste material, and the conductive material is any one of silver, copper and silver-coated copper.
6. The method as claimed in claim 5, wherein the soldering temperature of the conductive adhesive is 100-220 ℃ and the soldering time is 1-50 s.
7. The solar cell string welding method according to claim 5, wherein a distance between two cell pieces connected by the first solder ribbon is not more than 5 mm.
8. The solar cell string soldering method according to claim 1 or 2, further comprising the steps of: detecting whether welding defects and/or battery string defects exist.
9. A solar cell module is characterized by comprising a plurality of cell strings, wherein each cell string comprises a plurality of cell pieces which are mutually connected, grid lines are arranged on the cell pieces, and the grid lines on one side of at least one of the cell pieces and the adjacent cell pieces are welded with a first welding strip through heating, curing and conducting resin.
10. A solar cell string welding device is characterized by comprising
The glue spraying device is used for spraying conductive glue on the grid lines and the welding strips of the battery strings;
the placing device is used for placing the welding strip on a grid line of the battery string;
the conveying device is used for conveying the battery string and the welding strip to the welding mechanism;
the welding mechanism is used for heating the conductive adhesive to solidify the conductive adhesive and welding a welding strip to the grid line of the battery string;
and the detection mechanism is used for detecting whether welding defects and battery string defects exist after welding is finished.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010831987.7A CN111906467A (en) | 2020-08-18 | 2020-08-18 | Solar cell string welding method, cell module and welding device |
| CN202011400327.XA CN112404779A (en) | 2020-08-18 | 2020-12-02 | Solar cell string welding method, cell module and welding device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010831987.7A CN111906467A (en) | 2020-08-18 | 2020-08-18 | Solar cell string welding method, cell module and welding device |
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| CN111906467A true CN111906467A (en) | 2020-11-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010831987.7A Pending CN111906467A (en) | 2020-08-18 | 2020-08-18 | Solar cell string welding method, cell module and welding device |
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| CN115207138A (en) * | 2021-04-13 | 2022-10-18 | 苏州阿特斯阳光电力科技有限公司 | Photovoltaic module, battery string and manufacturing method thereof |
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| CN113078230A (en) * | 2021-03-25 | 2021-07-06 | 东方日升新能源股份有限公司 | Battery assembly and packaging method thereof |
| CN113314636B (en) * | 2021-05-28 | 2022-08-09 | 宁夏小牛自动化设备有限公司 | Preparation method of welding strip for single-side welding of dense-grid solar cell string |
| CN114613883A (en) * | 2022-03-16 | 2022-06-10 | 安徽华晟新能源科技有限公司 | Method for interconnecting battery strings and battery string interconnection structure |
| CN114850605B (en) * | 2022-04-29 | 2024-03-15 | 晶澳（邢台）太阳能有限公司 | Method and device for welding bus bars and junction boxes of photovoltaic modules |
| CN116159726A (en) * | 2022-10-11 | 2023-05-26 | 常州市北达机械制造有限公司 | Novel serial welding method for welding strip and battery piece |
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| KR101424716B1 (en) * | 2013-02-04 | 2014-08-04 | 재단법인 녹색에너지연구원 | Solar cell module having high-performance single-crystal silicon thin film and manufacturing method thereof |
| CN203401228U (en) * | 2013-05-06 | 2014-01-22 | 宫昌萌 | Equipment for series welding of crystalline silica solar energy cell |
| CN104701415A (en) * | 2015-02-13 | 2015-06-10 | 晶澳（扬州）太阳能科技有限公司 | Manufacture method for solar cell module via solar cells different in structure |
| CN105097068B (en) * | 2015-06-25 | 2017-03-08 | 英利能源（中国）有限公司 | Conducting resinl, solar cell string and preparation method thereof |
| CN107195719B (en) * | 2017-07-03 | 2024-03-08 | 滁州隆基乐叶光伏科技有限公司 | Production equipment of shingled solar photovoltaic module |
| CN110165007B (en) * | 2019-06-10 | 2021-03-23 | 浙江正泰太阳能科技有限公司 | Connection method of laminated cell string and manufacturing method of laminated assembly |
| CN210123750U (en) * | 2019-07-18 | 2020-03-03 | 苏州阿特斯阳光电力科技有限公司 | Automatic welding device for solar cell |
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| CN115207138B (en) * | 2021-04-13 | 2024-04-26 | 苏州阿特斯阳光电力科技有限公司 | Photovoltaic module, battery string and manufacturing method thereof |
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