CN107520549B - Multi-main-grid crystalline silicon solar cell series welding method and series welding machine thereof - Google Patents
Multi-main-grid crystalline silicon solar cell series welding method and series welding machine thereof Download PDFInfo
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- CN107520549B CN107520549B CN201710795050.7A CN201710795050A CN107520549B CN 107520549 B CN107520549 B CN 107520549B CN 201710795050 A CN201710795050 A CN 201710795050A CN 107520549 B CN107520549 B CN 107520549B
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- 238000003466 welding Methods 0.000 title claims abstract description 367
- 229910021419 crystalline silicon Inorganic materials 0.000 title claims abstract description 15
- 238000000034 method Methods 0.000 title claims description 17
- 239000002184 metal Substances 0.000 claims abstract description 117
- 238000001179 sorption measurement Methods 0.000 claims abstract description 74
- 238000003825 pressing Methods 0.000 claims description 22
- 239000011248 coating agent Substances 0.000 claims description 8
- 238000000576 coating method Methods 0.000 claims description 8
- 239000004809 Teflon Substances 0.000 claims description 4
- 229920006362 Teflon® Polymers 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 2
- 239000007769 metal material Substances 0.000 claims description 2
- 229910000679 solder Inorganic materials 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000005476 soldering Methods 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 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
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- 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
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- 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
- H01L31/20—Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof such devices or parts thereof comprising amorphous semiconductor materials
-
- 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
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The invention discloses a multi-main-grid crystalline silicon solar cell string welding machine which comprises a welding platform, a metal net frame, an infrared welding device, a multi-main-grid welding belt laying device and a manipulator, wherein the multi-main-grid welding belt laying device and the manipulator are arranged on the side surface of the vacuum adsorption type cell string welding platform; two welding platforms move along the X-axis direction, the infrared welding device and the multi-main-grid welding strip laying device can move along the Y-axis direction, when one welding platform lays a welding strip, a battery piece and a metal net frame, the other platform carries out battery string welding, the two platforms alternately carry out multi-main-grid battery string laying and welding, and the infrared welding device can move to the position above a platform to be welded to carry out welding according to needs. Due to the adoption of the double-platform design, the productivity and the working efficiency of the series welding machine can be improved, and meanwhile, no relative motion exists among the battery piece, the welding strip and the welding platform, so that the phenomenon that the welding strip cannot be welded on the battery piece due to the offset of the welding strip is avoided.
Description
Technical Field
The invention belongs to the field of solar cell string welding equipment design, and particularly relates to a method for welding a plurality of main grid crystalline silicon solar cell strings and a string welding machine thereof.
Background
The multi-main-grid technology is an important means for reducing cost and increasing efficiency of photovoltaic module suppliers by improving the output power of the photovoltaic module and reducing the manufacturing cost. At present, a plurality of thin metal wires are adopted in the multi-main-grid technology to replace a conventional solder strip to be connected in series with a non-main-grid battery piece, so that the number (10-25) of main grids of the multi-main-grid battery piece is greatly increased compared with that of a conventional 4-grid battery piece. At present, when a multi-main-grid series welding machine is used for welding multi-main-grid battery pieces, because 1 welding platform is adopted, the laying of the battery pieces and welding strips and the welding beat of the series welding machine cannot be completely independent, the productivity is low; on the other hand, relative motion exists between the welding platform and the battery piece and between the welding platform and the welding strip, so that welding offset phenomenon caused by welding strip offset is easy to occur.
Disclosure of Invention
In order to solve the problems, the invention discloses a novel multi-main-gate battery plate string welding method and a string welding machine, which can improve the welding speed of a battery string and reduce poor welding caused by welding strip offset.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the utility model provides a brilliant silicon solar cell cluster series welding machine of many main bars, includes vacuum adsorption formula battery cluster welding platform, metal mesh frame, infrared welding set, the many main bars of vacuum adsorption formula weld and take laying device, manipulator, the many main bars of vacuum adsorption formula weld and take laying device and manipulator setting in the side of vacuum adsorption formula battery cluster welding platform.
The vacuum adsorption type battery string welding machine is characterized in that the number of the vacuum adsorption type battery string welding platforms is two, a transverse moving device is arranged below the two vacuum adsorption type battery string welding platforms, the two platforms alternately lay and weld multiple main grid batteries in series, parallel operation of laying actions of battery pieces and welding strips and welding actions of the battery pieces is achieved, and welding speed of the series welding machine is increased.
The vacuum adsorption type battery string welding platform comprises a welding platform main body, welding strip vacuum adsorption holes, welding strip grooves and metal mesh frame vacuum adsorption holes, wherein the welding platform main body is provided with a plurality of welding strip grooves along the welding strip laying direction, the depth of each welding strip groove is smaller than the thickness of each welding strip, each welding strip groove is internally provided with at least one welding strip vacuum adsorption hole which is used for fixing a plurality of main grid welding strips positioned on the back surface of a battery piece,
the edge of the welding platform main body is provided with a metal mesh frame vacuum adsorption hole for fixing the metal mesh frame.
The welding platform main part is metal material or other high temperature resistant materials, and the surface has plated the teflon coating in order to prevent to bond with the solder strip, and the welding platform main part has heat transfer heat preservation function simultaneously.
The metal net frame mainly comprises a net rack, metal wires, a metal wire fixing shaft and a telescopic pressing block, wherein a plurality of rows of longitudinal grooves are formed in the net rack to fix the metal wires, two ends of each metal wire are fixed on the metal wire fixing shaft, the metal wires are tensioned by adjusting the metal wire fixing shaft, and the telescopic pressing block is arranged at two ends of the net rack; the battery string welding platform is provided with a metal mesh frame vacuum adsorption hole to adsorb the telescopic pressing block on the welding platform main body, the telescopic pressing block drives the metal wire to tightly attach to the front side of the battery piece and weld the belt, and the belt is fixed on the battery piece.
The metal wire is provided with an anticorrosive coating on the surface, and the anticorrosive coating is a Teflon coating.
The infrared welding device is of a double-lamp-box structure and mainly comprises a first welding lamp box, a second welding lamp box and a metal pressing strip; the main function of the first lamp box is cell preheating, the main function of the second lamp box is cell welding, the metal pressing strip is arranged below the second welding lamp box, and an elastic structure is arranged among the first welding lamp box, the second welding lamp box and the metal pressing strip.
The first welding lamp box is used for preheating the battery piece, the second welding lamp box is used for irradiating infrared rays onto the welding strip below the first welding lamp box, the soldering tin on the surface of the welding strip above the first welding lamp box is melted and welded with the battery piece, and the heat of the soldering strip is transferred to the back of the battery piece to enable the welding strip below the battery piece to be welded with the battery piece, so that the number of the infrared lamp tubes inside the first welding lamp box is less than that of the second welding lamp box.
The multi-main-grid welding strip laying device comprises a base, wherein a front vacuum adsorption mould welding strip groove, a front vacuum adsorption mould vacuum adsorption hole, a rear vacuum adsorption mould welding strip groove, a rear vacuum adsorption mould vacuum adsorption hole, a metal mesh frame metal wire groove and a metal mesh frame clamping jaw are arranged on the bottom surface of the base, the rear vacuum adsorption mould welding strip groove is matched with the welding strip groove structure and the position, the rear vacuum adsorption mould vacuum adsorption hole is formed in the rear vacuum adsorption mould welding strip groove, and the metal mesh frame metal wire groove is longitudinally formed in the bottom surface of the base.
The invention relates to a series welding machine, wherein a transverse moving device is arranged below two vacuum adsorption type battery series welding platforms and can only move along the X-axis direction, a longitudinal moving device is arranged below an infrared welding device and a multi-main grid welding strip laying device and can move along the Y-axis direction, the adsorption devices are arranged in a base and a welding platform main body, when the series welding machine works, a welding strip is laid in a welding strip groove of one welding platform main body, a welding strip vacuum adsorption hole is opened to adsorb a plurality of main grid welding strips on the back side of a battery piece, then a battery piece is laid on the welding strip by a manipulator, then the multi-main grid welding strip laying device lays a welding strip on the front side of the battery piece, a metal mesh frame is pressed on the front side welding strip, when the infrared welding device is pressed down integrally, the metal pressing strip is contacted with a metal wire of a metal mesh frame, welding of the battery piece and the welding strip is finished, and the welding strip, the battery piece and the metal mesh frame on the other welding platform are laid completely, the infrared welding device can be moved to continue welding, and the productivity and the series welding machine and the working efficiency are improved.
The invention has the beneficial effects that:
according to the multi-main-grid crystalline silicon solar cell string welding machine, 2 welding platforms independently perform cell string laying and cell string welding procedures, the capacity of the string welding machine can be improved in multiples, and meanwhile, due to the fact that no relative motion exists among the cell pieces, the welding strips and the welding platforms, the phenomenon that the welding strips cannot be placed on the cell pieces due to welding strip deviation is avoided.
Drawings
FIG. 1 is a schematic view of the present invention.
Fig. 2 is a schematic diagram of a vacuum adsorption type battery string welding platform according to the present invention.
Fig. 3 is a schematic view of the metal mesh frame of the present invention.
FIG. 4 is a schematic view of the infrared welding light box of the present invention.
Fig. 5 is a schematic view of the laying device for the multi-main grid solder strip of the invention.
Fig. 6 is a schematic bottom view of the multi-main grid solder strip laying apparatus of the present invention.
List of reference numbers:
the welding platform comprises a welding platform body 101, welding strip vacuum adsorption holes 102, welding strip grooves 103, metal mesh frame vacuum adsorption holes 104, a net rack 201, metal wires 202, a metal wire fixing shaft 203, a telescopic pressing block 204, a first welding lamp box 301, a second welding lamp box 302, an infrared lamp tube 303, a metal pressing strip 304, a metal mesh frame 305, welding strips 306, a battery piece 307, a base 401, a metal mesh frame clamping jaw 402, a rear vacuum adsorption mold welding strip groove 403, a rear vacuum adsorption mold vacuum adsorption hole 404, a metal mesh frame metal wire groove 405, welding platforms 601 and 602, a manipulator 603, an infrared welding lamp box 604 and a multi-main grid welding strip laying device 605.
Detailed Description
The present invention will be further illustrated with reference to the accompanying drawings and specific embodiments, which are to be understood as merely illustrative of the invention and not as limiting the scope of the invention. It should be noted that the terms "front," "back," "left," "right," "upper" and "lower" used in the following description refer to directions in the drawings, and the terms "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.
The invention relates to a multi-main-grid crystalline silicon solar cell series welding machine, which comprises vacuum adsorption type cell series welding platforms 601 and 602, a metal net frame 305, an infrared welding device 604, a vacuum adsorption type multi-main-grid welding strip laying device 605 and a manipulator 603, wherein the vacuum adsorption type multi-main-grid welding strip laying device 605 and the manipulator 603 are arranged on the side surface of the vacuum adsorption type cell series welding platform.
As shown in fig. 2, the welding platform mainly includes a welding platform main body 101, a welding strip vacuum suction hole 102, a welding strip groove 103, and a metal mesh frame vacuum suction hole 104.
A certain number of vacuum adsorption holes 102 are formed in the welding platform 101 along the laying position of the multi-main-grid welding strip, in order to further fix the welding strip on the welding platform 101, a welding strip groove 103 is formed in the laying direction of the welding strip, the depth of the welding strip groove 103 is smaller than the thickness of a welding strip 306, and a metal mesh frame vacuum adsorption hole 104 is formed in the edge of the welding platform 101 and used for fixing a metal mesh frame 305.
When the battery piece, the welding strip and the metal net frame are laid on the welding platform, no relative motion exists between the welding platform and the battery piece, the welding strip and the metal net frame, and the welding platform moves integrally to transport the battery piece laid on the welding platform to a welding station.
As shown in fig. 3, the metal mesh frame 305 mainly includes a rack 201, a metal wire 202, a metal wire fixing shaft 203, and a retractable pressing block 204, wherein a plurality of rows of longitudinal grooves are formed on the rack 201 to fix the metal wire 202, two ends of the metal wire 202 are fixed to the metal wire fixing shaft 203, the metal wire is tensioned by adjusting the metal wire fixing shaft, the metal mesh frame 305 does not directly press on the battery piece 307, but presses the battery piece 307 and the welding strip 306 on the battery piece through the metal wire 202, because the conveying belt is provided with vacuum adsorption holes to adsorb the retractable pressing block on the welding platform, the retractable pressing block 204 drives the metal wire 202 to adhere to the front welding strip of the battery piece, and fixes the welding strip on the battery piece.
As shown in fig. 4, the infrared welding light box 604 includes a first welding light box 301, a second welding light box 302, an infrared lamp 303, a metal bead 304, a metal mesh frame 305 under the welding light box during welding, a plurality of main grid welding strips 306 under the metal mesh frame, and a plurality of main grid cells 307 between the plurality of main grid welding strips.
Because the first welding lamp box 301 is used for preheating the battery pieces, the number of the infrared lamp tubes 303 is less than that of the second welding lamp box 302, the first station welding lamp box is free of the metal pressing strips 304, the metal pressing strips 304 are in elastic connection with the lamp box 604, downward pressure can be buffered, and the probability that the battery pieces are crushed is reduced; during welding, the light box 604 is pressed down, and the metal pressing bar 304 contacts with the metal wire 202 of the metal mesh frame 305, so that the welding of the battery piece 307 and the welding strip 306 is completed.
As shown in fig. 5 and 6, the multi-main-grid welding strip laying device includes a base 401, an adsorption device is arranged inside the base 401 and the welding platform main body 101, a front vacuum adsorption mold welding strip groove, a front vacuum adsorption mold vacuum adsorption hole, a rear vacuum adsorption mold welding strip groove 403, a rear vacuum adsorption mold vacuum adsorption hole 404, a metal mesh frame metal wire groove 405, and a metal mesh frame clamping jaw 402 are arranged on the bottom surface of the base 401, the rear vacuum adsorption mold welding strip groove 403 is matched with the welding strip groove 103 in structure and position, the rear vacuum adsorption mold vacuum adsorption hole 404 is arranged in the rear vacuum adsorption mold welding strip groove 403, and the metal mesh frame metal wire groove 405 is longitudinally arranged on the bottom surface of the base 401.
Taking 16 multi-main-grid welding strip laying devices as examples, circular multi-main-grid welding strips are adopted, the diameter of each welding strip is 0.36mm, the width of a groove 403 of each rear vacuum adsorption module welding strip is 0.4mm, the depth of the groove is 0.25mm, and the width of a metal wire groove 405 of a metal net frame is 3mm and the depth of the metal wire groove is 5mm.
The laying process of the multi-main-grid welding strip and the metal mesh frame is as follows:
(1) Grabbing a metal mesh frame, wherein metal wires 202 of the metal mesh frame are overlapped with metal wire grooves 405 of the metal mesh frame on the bottom surface of the base, and the depth of the metal wires embedded into the base is about 1.5-2mm so as to prevent the metal wires from blocking the laying of a welding strip;
(2) The manipulator 603 stretches the multi-main grid welding strip below the multi-main grid welding strip laying device 605, the stretching direction is overlapped with the welding strip groove, the multi-main grid welding strip laying device 605 is pressed down, the vacuum adsorption hole is opened, and the welding strip is adsorbed in the welding strip groove 103, which is the welding strip below the battery piece;
(3) The multi-main-grid welding strip laying device runs above the welding platform, the multi-main-grid welding strip 306 and the metal mesh frame 305 are placed on the battery piece 307, and laying of the multi-main-grid welding strip and the metal mesh frame is completed.
The welding method of the multi-main grid crystalline silicon solar cell string comprises the following steps:
(1) The method comprises the following steps that a manipulator and a multi-main-grid welding strip laying device are adopted to lay a multi-main-grid battery piece, a multi-main-grid welding strip and a metal net frame on a welding platform I in sequence according to the order of the multi-main-grid welding strip, the multi-main-grid battery piece, the multi-main-grid welding strip and the metal net frame, and the number of battery pieces in a laid battery string is 3-12;
(2) After the laying of the multi-main-grid battery strings on the first welding platform is finished, the first welding platform moves integrally, and the battery piece on the first welding platform is transported to the position below the infrared welding lamp box to be welded; when a plurality of main grid battery strings on a first welding platform are welded, a manipulator and a plurality of main grid welding strip laying device are adopted to lay a plurality of main grid battery pieces, a plurality of main grid welding strips and a metal net frame on a second welding platform in sequence of the plurality of main grid welding strips, the plurality of main grid battery pieces, the plurality of main grid welding strips and the metal net frame, and the number of the battery pieces in the laid battery strings is consistent with that of the battery strings in the first welding platform;
(3) When welding of all battery pieces on the first welding platform is completed, the first welding platform moves integrally to convey the battery strings on the platform to the position of a battery string receiving manipulator, when the first battery string receiving step on the first welding platform is completed by the receiving manipulator, the second welding platform completes battery string laying and starts to weld the second battery string, and battery string laying and welding are respectively performed by arranging 2 welding platforms, so that separation of battery string laying and welding steps is realized, and the welding speed of the multiple main grid battery pieces is increased.
(4) When the second welding platform finishes welding the second string of battery strings, the first welding platform finishes laying the third string of battery strings, when the second welding platform finishes collecting the second string of battery strings, the first welding platform starts welding the third string of battery strings, and the above circulation is repeated, and the first welding platform and the second welding platform independently finish laying, welding and collecting the battery strings in turn.
The two welding platforms 601 and 602 are parallel to each other and can move along the X-axis direction, and the infrared welding light box 604 moves along the Y-axis direction to a position right above the first welding platform 601 and the second welding platform 602.
The time for completing welding of one battery piece is not more than 3.5s in the welding process, and the time for completing laying of one battery piece and the welding strip thereof is not more than 3s.
After the welding of the battery strings is completed, the metal mesh frame for fixing the battery pieces and the welding strips can be grabbed to the circulating position of the metal mesh frame by a manipulator so as to realize the recycling of the metal mesh frame, and the multi-main-grid welding strip laying device can realize the one-time action of placing the multi-main-grid welding strips and the metal mesh frame.
The cross section of the multi-main-grid welding strip can be rectangular or circular.
As shown in fig. 1, the schematic diagram of welding a multi-master grid crystalline silicon solar cell string according to the present invention mainly includes welding platforms 601 and 602, a cell sheet laying device, that is, a manipulator 603, an infrared welding light box 604, and a multi-master grid welding strip laying device 605.
The welding platforms 601 and 602 can only move along the x-axis direction, and the infrared welding lamp box 604 and the multi-main grid welding strip laying device 605 can only move along the y-axis direction. In fig. 1, a welding platform 601 has already finished laying a first battery piece, a welding strip and a metal mesh frame, a welding platform 602 has already finished welding the first battery piece, 2 welding platforms independently perform battery string laying and battery string welding processes, the productivity of a string welding machine can be effectively improved, and meanwhile, because no relative motion exists among the battery piece, the welding strip and the welding platform, the phenomenon that the welding strip cannot be on the battery piece due to welding strip deviation is avoided.
The technical means disclosed in the invention scheme are not limited to the technical means disclosed in the above embodiments, but also include the technical scheme formed by any combination of the above technical features.
Claims (7)
1. The utility model provides a many main bars crystalline silicon solar cell cluster stringer which characterized in that: the device comprises a vacuum adsorption type battery string welding platform, a metal mesh frame, an infrared welding device, a vacuum adsorption type multi-main-grid welding strip laying device and a manipulator, wherein the vacuum adsorption type multi-main-grid welding strip laying device and the manipulator are arranged on the side surface of the vacuum adsorption type battery string welding platform;
the vacuum adsorption type battery string welding platform comprises two vacuum adsorption type battery string welding platforms, wherein a transverse moving device is arranged below the two vacuum adsorption type battery string welding platforms, each vacuum adsorption type battery string welding platform comprises a welding platform main body, welding strip vacuum adsorption holes, welding strip grooves and a metal net frame vacuum adsorption hole, the welding platform main body is provided with a plurality of welding strip grooves along the welding strip laying direction, the depth of each welding strip groove is smaller than the thickness or the diameter of each welding strip, each welding strip groove is internally provided with at least one welding strip vacuum adsorption hole, and the edge of the welding platform main body is provided with the metal net frame vacuum adsorption holes;
the metal net frame comprises a net rack, metal wires, metal wire fixing shafts and telescopic pressing blocks, wherein the net rack is provided with a plurality of rows of longitudinal grooves for fixing the metal wires, two ends of each metal wire are connected with the metal wire fixing shafts, and the telescopic pressing blocks are arranged at two ends of the net rack;
the infrared welding device is of a double-lamp-box structure and comprises a first welding lamp box, a second welding lamp box and a metal pressing strip, wherein the metal pressing strip is arranged below the second welding lamp box, and the number of infrared lamp tubes in the first welding lamp box is less than that of the second welding lamp box;
the multi-main-grid welding strip laying device comprises a base, wherein the bottom surface of the base is provided with a front vacuum adsorption mold welding strip groove, a front vacuum adsorption mold vacuum adsorption hole, a rear vacuum adsorption mold welding strip groove, a rear vacuum adsorption mold vacuum adsorption hole, a metal net frame metal wire groove and a metal net frame clamping jaw;
the welding platform main body is made of metal materials or high-temperature-resistant materials, a Teflon coating is plated on the surface of the welding platform main body, and the temperature adjusting range of the welding platform is 80-170 ℃.
2. The multi-main grid crystalline silicon solar cell string welding machine according to claim 1, characterized in that: the metal wire is provided with an anticorrosive coating on the surface, and the anticorrosive coating is a Teflon coating.
3. The multi-main grid crystalline silicon solar cell string welding machine according to claim 1, characterized in that: an elastic layer is arranged among the first welding lamp box, the second welding lamp box and the metal pressing strip.
4. The multi-main grid crystalline silicon solar cell string welding machine according to claim 1, characterized in that: the two welding platforms are parallel to each other.
5. The multi-main-grid crystalline silicon solar cell string welding machine according to claim 1, characterized in that: the cross section of the multi-main-grid welding strip is rectangular or circular.
6. The welding method by using the multi-main-grid crystalline silicon solar cell string welding machine of claim 1, wherein the welding method comprises the following steps: a transverse moving device is arranged below the two vacuum adsorption type battery string welding platforms and can only move along the X-axis direction, a longitudinal moving device is arranged below the infrared welding device and the multi-main-grid welding strip laying device and can move along the Y-axis direction, an adsorption device is arranged inside the base and the welding platform main body, a welding strip is laid in a welding strip groove of one welding platform main body during working, a welding strip vacuum adsorption hole is opened to adsorb the multi-main-grid welding strips on the back surface of the battery piece, then the battery piece is laid on the welding strip by a mechanical arm, then the multi-main-grid welding strip laying device lays a welding strip on the front surface of the battery piece, a metal mesh frame is pressed on the front surface welding strip, the infrared welding device is pressed down integrally during welding, a metal pressing strip is contacted with metal wires of the metal mesh frame, the welding of the battery piece and the welding strip is completed at the moment, the welding strip, the battery piece and the metal mesh frame on the other welding platform are laid completely, the infrared welding device is moved to continue welding, and the cycle is carried out;
the method specifically comprises the following steps:
(1) The method comprises the following steps that a manipulator and a multi-main-grid welding strip laying device are adopted to lay a multi-main-grid battery piece, a multi-main-grid welding strip and a metal net frame on a welding platform I in sequence according to the order of the multi-main-grid welding strip, the multi-main-grid battery piece, the multi-main-grid welding strip and the metal net frame, and the number of battery pieces in a laid battery string is 3-12;
(2) After the multi-main-grid battery string on the first welding platform is laid, the first welding platform moves integrally, and the battery piece on the first welding platform is conveyed to the lower part of the infrared welding lamp box to be welded; when a plurality of main grid battery strings on a first welding platform are welded, a manipulator and a plurality of main grid welding strip laying device are adopted to lay a plurality of main grid battery pieces, a plurality of main grid welding strips and a metal net frame on a second welding platform in sequence of the plurality of main grid welding strips, the plurality of main grid battery pieces, the plurality of main grid welding strips and the metal net frame, and the number of the battery pieces in the laid battery strings is consistent with that of the battery strings in the first welding platform;
(3) When welding of all the battery pieces on the first welding platform is completed, the first welding platform moves integrally to convey the battery strings on the platform to the position of a battery string receiving manipulator, and when the receiving manipulator completes the step of receiving the first battery string on the first welding platform, the second welding platform completes laying of the battery piece strings and starts to weld the second battery string;
(4) When the second welding platform finishes welding the second string of battery strings, the first welding platform finishes laying the third string of battery strings, when the second welding platform finishes collecting the second string of battery strings, the first welding platform starts welding the third string of battery strings, and the above circulation is repeated, and the first welding platform and the second welding platform independently finish laying, welding and collecting the battery strings in turn.
7. The method for welding the multi-main grid crystalline silicon solar cell string according to claim 6, wherein the method comprises the following steps: the time for completing welding of one battery piece is not more than 3.5s in the welding process, and the time for completing laying of one battery piece and the welding strip thereof is not more than 3s.
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