CN113314637A - Preparation method of single-side welded dense-grid solar cell string - Google Patents
Preparation method of single-side welded dense-grid solar cell string Download PDFInfo
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- CN113314637A CN113314637A CN202110592850.5A CN202110592850A CN113314637A CN 113314637 A CN113314637 A CN 113314637A CN 202110592850 A CN202110592850 A CN 202110592850A CN 113314637 A CN113314637 A CN 113314637A
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- 238000002360 preparation method Methods 0.000 title abstract description 6
- 238000003466 welding Methods 0.000 claims abstract description 97
- 238000000034 method Methods 0.000 claims abstract description 61
- 239000002313 adhesive film Substances 0.000 claims abstract description 22
- 229910000679 solder Inorganic materials 0.000 claims abstract description 21
- 238000004519 manufacturing process Methods 0.000 claims abstract description 12
- 238000005452 bending Methods 0.000 claims abstract description 10
- 238000001514 detection method Methods 0.000 claims abstract description 10
- 230000004907 flux Effects 0.000 claims abstract description 5
- 238000002503 electroluminescence detection Methods 0.000 claims abstract description 4
- 238000010438 heat treatment Methods 0.000 claims description 11
- 238000000926 separation method Methods 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 4
- 230000002457 bidirectional effect Effects 0.000 claims description 2
- 238000007689 inspection Methods 0.000 claims 1
- 239000004744 fabric Substances 0.000 abstract description 19
- 239000011248 coating agent Substances 0.000 abstract description 5
- 238000000576 coating method Methods 0.000 abstract description 5
- 238000005476 soldering Methods 0.000 abstract description 4
- 239000007888 film coating Substances 0.000 description 6
- 238000009501 film coating Methods 0.000 description 6
- 239000004831 Hot glue Substances 0.000 description 4
- FFBHFFJDDLITSX-UHFFFAOYSA-N benzyl N-[2-hydroxy-4-(3-oxomorpholin-4-yl)phenyl]carbamate Chemical compound OC1=C(NC(=O)OCC2=CC=CC=C2)C=CC(=C1)N1CCOCC1=O FFBHFFJDDLITSX-UHFFFAOYSA-N 0.000 description 3
- 238000006748 scratching Methods 0.000 description 3
- 230000002393 scratching effect Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000007664 blowing Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004093 laser heating Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
- H01L31/04—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 adapted as photovoltaic [PV] conversion devices
- H01L31/042—PV modules or arrays of single PV cells
- H01L31/05—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells
- H01L31/0504—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells specially adapted for series or parallel connection of solar cells in a module
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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
- H01L31/1876—Particular processes or apparatus for batch treatment of the devices
- H01L31/188—Apparatus specially adapted for automatic interconnection of solar cells in a module
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
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- 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
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Abstract
The invention provides a preparation method of a single-side welded dense-grid solar cell string, which mainly comprises the following steps: supply piece process, cloth piece coating film process, system area strap process and welding to detect the process, wherein, supply the piece process to include in proper order: detecting a battery piece, scribing by laser, detecting the divided battery piece for the first time, overturning the divided battery piece, dividing the divided battery piece for a certain distance, and detecting the divided battery piece for the second time; the cloth film application process sequentially comprises the following steps: arranging an adhesive film and arranging the partitioned battery pieces; the tape making cloth tape process comprises the following steps: coating the soldering flux on the solder strip, pulling the tape, manufacturing the tape, and bending the sectional solder strip; the welding detection process comprises the following steps: and welding and EL detection, and the method is mainly used for welding the single-side welded dense grid solar cell string.
Description
Technical Field
The invention relates to a preparation method of a solar cell string, in particular to a preparation method of a single-side welded dense-grid solar cell string.
Background
The dense grid single-sided solar cell piece is a technology for uniformly moving metal contacts of a positive electrode and a negative electrode to the back of the cell piece, so that the front of the cell piece facing the sun is free of metal wire shielding, the power generation efficiency of the same area and larger area is brought to a user, and the appearance is more attractive.
When the dense grid single-sided battery pieces are connected in series in a conductive mode, the invention provides a method for welding the back surfaces of the battery pieces by using a traditional welding strip.
Disclosure of Invention
The battery piece used in the method is a single-sided dense-gate battery piece, the front side of the battery piece is not provided with a bonding pad welded with a welding strip, and the bonding pad is completely positioned on the back side of the battery piece.
The invention provides a preparation method of a single-side welded dense-grid solar cell string for solving the problems in the prior art, which comprises the following steps:
the method comprises the following steps: dividing the whole cell into n equal parts of divided cells; because the battery piece used by the invention is of an integral structure and the battery piece on the battery string required by the customer is a 2-piece battery piece, the step uses a single laser to cut the battery piece into 2-piece battery pieces, and the number of the lasers can be increased on the transmission path of the battery piece according to the requirement to cut the battery piece into n equal-part segmented battery pieces.
Step two: in order to realize the integral welding of the battery string, the sliced battery pieces required by the battery string need to be arranged according to the specified piece spacing, so that the whole string of battery pieces is integrally conveyed to a welding station before welding;
step three: in order to realize the integral welding of the battery string, preparing each segmented welding strip required by the welding of the battery string, and arranging the segmented welding strips according to the relative position of each segmented welding strip on the finished battery string so as to integrally convey the welding strips required by the battery cells of the whole string to a welding station before the welding;
step four: the back surfaces of the whole string of the segmented battery pieces distributed in the step two are attached to the segmented welding strips distributed in the step three in a grid line alignment mode;
step five: and heating and cooling each partitioned battery plate and the segmented welding strips, and welding into the single-sided solar battery string.
The process described in the first step to the second step and the process described in the third step are performed simultaneously.
Furthermore, before the first step is implemented, appearance detection and position correction need to be performed on the whole cell, so that the shape and the size of each split cell after the splitting are regular and consistent, and the situation that the hidden split cell enters the splitting process is avoided.
Furthermore, the front surface of the cell is the surface which receives light, in order to reduce the damage of the laser scribing to the front surface of the cell, the laser scribing needs to be carried out from the back surface of the cell, and if the scribing is carried out from the front surface of the cell in the first step, the cell needs to be turned over by 180 degrees and then the second step is carried out.
Further, before the battery piece is turned over, the appearance detection and the distance separation of the battery piece need to be carried out.
Further, before the second step is implemented, the separation, appearance detection and position correction need to be performed on the split battery pieces, so that the accurate positions of the split battery pieces arranged in a string are ensured, the possible offset of the split battery pieces in the transmission process is eliminated, and whether the battery pieces are damaged or subfissure in the processes of scratching, overturning, separation and transportation is detected.
Further, before the second step is implemented, glue films with the same width as the split battery pieces are respectively arranged on two sides of each battery piece in the length direction of the battery string, and a single glue film is arranged between every two adjacent battery pieces;
the film coating among the battery pieces is mainly used for shielding the piece intervals among the battery pieces and bonding the battery pieces into a whole string, so that the battery pieces are prevented from relative displacement in the subsequent transfer process, and the film coating is not needed if the piece intervals among the battery pieces are zero or the battery pieces are arranged in a mutually overlapped mode.
And further, the hot melt adhesive on the adhesive film can generate viscosity at a certain heating temperature, in the third step, after the battery pieces and the adhesive film are alternately arranged, heating operation is carried out on the battery pieces and the adhesive film to enable the adhesive film to be attached to the back of the battery pieces to form a semi-finished battery string, and when the adhesive film is placed, the side, with the hot melt adhesive, of the adhesive film faces upwards and faces the back of the battery pieces.
And further, arranging the segmented welding strips for connecting the battery pieces on the battery string according to a specified strip spacing, wherein the segmented welding strips comprise an axial strip spacing and a radial strip spacing, the segmented welding strips welded on adjacent grid lines need to be arranged in a staggered mode in the axial direction, if the conventional welding mode that the cloth strips and the cloth strips are alternately arranged on the double-sided battery pieces is adopted, the welding mode is not suitable for welding the single-sided dense grid battery string, before the third step is implemented, the welding strips required by the whole string of battery strings are firstly pulled out from the welding strip coil, the total length of the required welding strips is integrally controlled, and the accumulated error caused by multiple times of strip pulling is avoided.
Furthermore, soldering flux is smeared on the welding strip in the strip pulling process, so that firm welding between the welding strip and the cell is facilitated.
Further, for the strap operation of the dense-grid cell, under the condition that the distance between grid lines is small, all the strip supply rolls cannot be installed on the same side due to the limited mechanical structure, when the number of the grid lines on the whole string of cell is more than 10-12, two sets of first welding strip groups and second welding strip groups which are staggered with each other are pulled out from different directions to the middle at least twice in a bidirectional strap mode, and the welding strips on the first welding strip groups or the second welding strip groups are not adjacent to each other.
Furthermore, before the fourth step is implemented, the position of each sliced battery piece arranged according to the specified piece spacing is corrected, so that the correct bonding position of each sliced battery piece and each segmented welding strip is ensured, and the possible deviation in the process of individually conveying the battery pieces is eliminated.
And further, before the fourth step is implemented, segmented bending operation is implemented on each segmented welding strip, the bending position is located on the welding strip section between the welding pads on the finished product battery string, the bending direction is consistent with the direction of the back surface of the battery piece, due to the battery string welded on one surface, the tensile stress generated after the welding strip and the battery piece are welded can aggravate the upward arching of the front surface of the battery piece into an arc surface, and therefore, in order to eliminate the stress before welding, the welding strip needs to be bent in the opposite direction, and the tensile stress generated after welding is eliminated.
Furthermore, the fifth step preferably adopts an infrared lamp tube heating mode, and can also adopt an electromagnetic induction heating mode or a laser heating mode.
Further, after the fifth step is carried out, the welded battery string is subjected to EL detection, and whether the battery string meets the requirements is checked.
The invention has the technical effects that: the battery piece required by welding is obtained by scratching, overturning and transferring the battery piece; through drawing the strips, manufacturing the strips to obtain each sectional welding strip required by welding, and arranging the welding strips according to the specified strip spacing; arranging the battery pieces and the adhesive film required by the whole string of battery strings in the form of finished battery strings by coating the film with cloth pieces; and finally, combining the arranged segmented welding strips and the segmented battery pieces together in a grid line alignment mode, and carrying out heating welding to realize the one-time completion of the series welding of the whole dense-grid battery.
Drawings
FIG. 1 is a flow chart of a welding method of the present invention;
FIG. 2 is a schematic front view of a monolithic cell of the present invention;
FIG. 3 is a schematic view of the back side of a monolithic cell of the present invention;
FIG. 4 is a schematic view of a full cell wafer dicing of the present invention;
FIG. 5 is a schematic view of a cloth sheet filming process of the present invention;
FIG. 6 is a schematic view of a draw tape process of the present invention;
FIG. 7 is a schematic view of a belt making process of the present invention;
fig. 8 is a schematic view of the welding process of the present invention.
In the figure, 1, a sheet supply process, 2, a cloth sheet film coating process, 3, a tape making cloth tape process, 4, a welding detection process, 10, a bonding pad, 20, an adhesive film, 31, a first welding tape group, 32, a second welding tape group and 33, a sectional welding tape.
Detailed Description
The following describes a specific embodiment of the present invention with reference to fig. 1 to 8.
Fig. 1 illustrates the main steps and flow of welding a single-sided dense-gate battery plate, which mainly comprises: supply piece process 1, cloth piece coating film process 2, belting strap process 3 and welding and detect process 4, wherein, supply piece process 1 once to include: detecting a battery piece, scribing by laser, detecting the divided battery piece for the first time, overturning the divided battery piece, dividing the divided battery piece for a certain distance, and detecting the divided battery piece for the second time; the cloth piece filming process 2 includes once: arranging an adhesive film and arranging the partitioned battery pieces; the tape making cloth tape process 3 includes: coating the soldering flux on the solder strip, pulling the tape, manufacturing the tape, and bending the sectional solder strip; the welding detection process 4 includes: welding and EL detection.
Fig. 2 and 3 illustrate the front structure and the back structure of a front-side single-sided power gate battery plate, respectively, wherein a bonding pad 10 is located on the back side of the battery plate.
Fig. 4 illustrates a state that the whole cell is divided into 2 pieces of cell, and the division of the cell is required to be performed along a direction perpendicular to each grid line.
Fig. 5 illustrates a state in which the divided battery pieces and the adhesive film 20 are arranged after the film coating process, the divided battery pieces are arranged according to the piece pitch of each battery piece on the whole string of battery strings, the adhesive film 20 is located on both sides of each divided battery piece, and adjacent battery pieces are simultaneously connected by using one adhesive film 20.
Fig. 6 and 7 illustrate the state of the tape making cloth tape process 3, in the process of pulling out the solder tape, the soldering flux is coated on the surface of the solder tape, when pulling out, the first solder tape group 31 and the second solder tape group 32 are pulled out towards the middle from different directions, and the two groups of solder tapes are alternately arranged in the radial direction and staggered in the axial direction;
and pulling the strip, cutting off the welding strip at each sectional point according to the sectional point position of each sectional welding strip on the battery string, and moving each sectional welding strip according to the requirement of the strip interval on the battery string after cutting off, thereby finishing the separation.
Fig. 8 shows that the cell pieces arranged in the film coating step 2 and the welding strip prepared in the tape making cloth strip step 3 are placed together in a grid line alignment manner, and then heated and cooled, so that the welding strip is welded with the bonding pad on the back surface of the cell piece to form a cell string.
The working principle is as follows: taking a dense-gate battery string composed of 11 pieces of 17 gate battery pieces as an example, the battery pieces and the welding strips which need to be welded are prepared through a piece supplying process 1, a cloth piece film coating process 2 and a strip preparing and cloth tape process 3.
A sheet feeding step 1: carrying out appearance detection and position correction on the whole cell before scribing, rejecting the cells which do not meet the requirements, and scribing the qualified cells by using laser; detecting and correcting the position of the scratched battery piece again, detecting the damage possibly caused by laser scratching to the battery, and spacing after detection to ensure that the battery pieces are not contacted with each other during transportation; turning the qualified sliced battery piece by 180 degrees to enable the back of the sliced battery piece to face downwards, detecting and correcting the position of the sliced battery piece after the separation, wherein the qualified sliced battery piece can flow into a cloth piece film application process 2;
cloth film application process 2: arranging the adhesive film 20 in a mode specified by the battery string, enabling the side, with the hot melt adhesive, of the adhesive film 20 to face upwards, sequentially placing the partitioned battery pieces on the adhesive film 20, keeping the piece spacing between the partitioned battery pieces to meet the requirements of the battery string, and heating the adhesive film 20 and the partitioned battery pieces to enable the hot melt adhesive on the adhesive film 20 to have viscosity and be attached to the back sides of the partitioned battery pieces to finish film laying of the film;
tape making cloth tape process 3: pulling out a first welding strip group 31 and a second welding strip group 32 from two directions to the middle, wherein the first welding strip group 31 and the second welding strip group 32 are placed in a staggered mode in the axial direction of the welding strips, grid lines corresponding to the first welding strip group 31 on the battery piece and grid lines corresponding to the second welding strip group 32 on the battery piece are alternately arranged, the first welding strip group 31 and the second welding strip group 32 are divided into each segmented welding strip needing to be welded on the battery string, the position of each segmented welding strip is adjusted according to the strip spacing on the battery string, each segmented welding strip is subjected to segmented bending, the bending position is located on a welding strip section between each welding pad 10 on the finished battery string, the bending direction is the same as the direction of the back surface of the battery piece, and the bent welding strip can be subjected to a welding process 4;
and a welding process 4: arranging the segmented welding strips below, arranging the segmented battery pieces to be welded above the welding strips in a mode that grid lines are aligned with the segmented welding strips, heating the welding strips and the segmented battery pieces by using an infrared heating pipe, blowing the battery strings by using cooling air, and cooling the battery strings to weld the segmented welding strips and the segmented battery pieces into the battery strings.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (14)
1. A method for preparing a single-side welded dense grid solar cell string is used for preparing the single-side welded dense grid solar cell string, and is characterized by comprising the following steps:
the method comprises the following steps: dividing the whole cell into n equal parts of divided cells;
step two: arranging the partitioned battery pieces required by the battery string according to the specified piece spacing;
step three: preparing each segmented welding strip (33) required by welding the battery string, and arranging the segmented welding strips (33) according to the relative positions of the segmented welding strips (33) on the finished battery string;
step four: the back surfaces of the whole string of the segmented battery pieces distributed in the step two are attached to the segmented welding strips (33) distributed in the step three in a grid line alignment mode;
step five: and heating and cooling each partitioned battery plate and the segmented welding strip (33) to weld into the solar battery string.
The process described in the first step to the second step and the process described in the third step are performed simultaneously.
2. The method for manufacturing a single-side welded dense grid solar cell string as claimed in claim 1, wherein before the first step is performed, appearance detection and position correction are performed on the whole split cell, so as to ensure that the split cell has regular shape.
3. The method for preparing the single-side welded dense grid solar cell string as claimed in claim 1, wherein if the first step is performed by scribing from the front surface of the cell, the cell needs to be turned by 180 ° before the second step is performed.
4. The method for manufacturing a single-sided soldered dense-grid solar cell string according to claim 3, wherein before turning over the cell, the appearance inspection and the separation of the split cells are required.
5. The method for manufacturing a single-side welded dense grid solar cell string according to claim 1, wherein before the second step is performed, appearance detection and position correction are performed on the split cells to ensure that the split cells arranged in the string are accurate in position.
6. The method for manufacturing a single-side welded dense grid solar cell string according to claim 1, wherein before the second step is performed, adhesive films (20) with the same width as that of the split cell pieces are respectively arranged between every two adjacent cell pieces.
7. The method for manufacturing the single-side welded dense grid solar cell string according to claim 6, wherein in the third step, after the split cell pieces and the adhesive film (20) are alternately arranged, the split cell pieces and the adhesive film (20) are heated, so that the adhesive film (20) is attached to the back surfaces of the split cell pieces to form a semi-finished cell string.
8. The method for manufacturing a single-sided soldered dense-grid solar cell string as claimed in claim 1, wherein the solder ribbon required for the entire string of cells is pulled from the solder ribbon roll before the third step is performed.
9. The method of making a single-sided soldered dense grid solar cell string of claim 8, wherein the solder tape is coated with a flux during the tape pulling process.
10. The method for preparing the single-side welded dense grid solar cell string according to claim 9, wherein when the number of grid lines on the whole string of cell sheets is more than 10-12, two groups of first solder strip groups (31) and second solder strip groups (32) which are staggered with each other are pulled out from different directions to the middle at least twice in a bidirectional pull strip mode, and the solder strips on the first solder strip groups (31) or the second solder strip groups (32) are not adjacent to each other.
11. The method for preparing the single-side welded dense grid solar cell string according to claim 1, wherein before the fourth step, the position of each segmented cell arranged according to the specified cell spacing is corrected to ensure that the bonding position of each segmented cell and each segmented solder strip (33) is correct.
12. The method for manufacturing a single-sided soldered dense-grid solar cell string according to claim 1, wherein before the fourth step, a step of bending the respective segmented solder ribbons (33) in sections is performed, the bending being located on the solder ribbon sections between the solder pads (10) on the finished cell string.
13. The method for preparing a single-side welded dense grid solar cell string as claimed in claim 1, wherein the step five adopts an infrared lamp tube heating mode.
14. The method for manufacturing a single-sided soldered dense-grid solar cell string according to claim 1, wherein the soldered cell string is subjected to EL detection after the fifth step.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7490878B1 (en) | 2023-08-09 | 2024-05-27 | 晶科能源股分有限公司 | Cell string welding method and string welding machine |
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