CN115302120A - Welding method of battery piece and photovoltaic prefabricated part - Google Patents
Welding method of battery piece and photovoltaic prefabricated part Download PDFInfo
- Publication number
- CN115302120A CN115302120A CN202211128313.6A CN202211128313A CN115302120A CN 115302120 A CN115302120 A CN 115302120A CN 202211128313 A CN202211128313 A CN 202211128313A CN 115302120 A CN115302120 A CN 115302120A
- Authority
- CN
- China
- Prior art keywords
- alloy
- welding
- cell
- grid line
- photovoltaic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 41
- 238000003466 welding Methods 0.000 title claims abstract description 24
- 239000000956 alloy Substances 0.000 claims abstract description 98
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 98
- 239000002184 metal Substances 0.000 claims abstract description 68
- 238000010438 heat treatment Methods 0.000 claims abstract description 12
- 239000007788 liquid Substances 0.000 claims description 67
- 239000011248 coating agent Substances 0.000 claims description 40
- 238000000576 coating method Methods 0.000 claims description 40
- 239000000463 material Substances 0.000 claims description 21
- 239000002313 adhesive film Substances 0.000 claims description 19
- 239000011521 glass Substances 0.000 claims description 5
- 238000007654 immersion Methods 0.000 claims description 5
- 238000007747 plating Methods 0.000 claims description 5
- 238000007650 screen-printing Methods 0.000 claims description 5
- 238000005507 spraying Methods 0.000 claims description 5
- 238000005266 casting Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 230000003068 static effect Effects 0.000 claims description 2
- 230000004907 flux Effects 0.000 claims 2
- 238000007711 solidification Methods 0.000 claims 1
- 230000008023 solidification Effects 0.000 claims 1
- 238000003475 lamination Methods 0.000 description 5
- 238000002360 preparation method Methods 0.000 description 5
- 239000012528 membrane Substances 0.000 description 4
- 239000005002 finish coating Substances 0.000 description 3
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 3
- 229920006124 polyolefin elastomer Polymers 0.000 description 3
- DQXBYHZEEUGOBF-UHFFFAOYSA-N but-3-enoic acid;ethene Chemical compound C=C.OC(=O)CC=C DQXBYHZEEUGOBF-UHFFFAOYSA-N 0.000 description 2
- 239000005038 ethylene vinyl acetate Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
Classifications
-
- 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
-
- 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
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
-
- 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
Abstract
The invention discloses a welding method of a battery piece and a photovoltaic prefabricated part, which comprises the following steps: covering a layer of alloy on the surface of the grid line of the cell and/or the surface of the metal line of the photovoltaic prefabricated part; the method comprises the following steps of (1) stacking and fixing a battery piece on a photovoltaic prefabricated part, and enabling a grid line of the battery piece to be correspondingly contacted with a metal line of the photovoltaic prefabricated part through an alloy; and (3) pressurizing and heating the alloy to complete the welding of the alloy and the corresponding grid line and the corresponding metal line. The invention can ensure that the grid line of the cell and the metal line of the photovoltaic prefabricated part form stable ohmic contact, and reduce the contact resistance between the cell and the metal line, thereby improving the overall FF and power of the photovoltaic module.
Description
Technical Field
The invention relates to the field of photovoltaics, in particular to a method for welding a battery piece and a photovoltaic prefabricated part.
Background
The preparation of traditional photovoltaic module is generally with glass, first glued membrane (highly pass through EVA or POE glued membrane), through battery piece, second glued membrane (high resistant glued membrane), the backplate of metal wire series connection stack in proper order and lay the back and carry out the lamination.
In order to improve the preparation efficiency of the assembly, a photovoltaic prefabricated member made of glass, a first adhesive film and a metal wire is currently available, and during assembly preparation, a battery piece is fixed on the photovoltaic prefabricated member in a stacking mode (grid lines of the battery piece are correspondingly contacted with the metal wire of the photovoltaic prefabricated member), a second adhesive film and a back plate are sequentially stacked on the battery piece, then lamination is carried out, and the grid lines of the battery piece are electrically connected with the metal wire of the photovoltaic prefabricated member through lamination.
However, it is difficult to form a stable electrical connection between the grid lines of the cell and the metal lines of the photovoltaic prefabricated member only by lamination, and even if the electrical connection is stable, the contact resistance between the grid lines and the metal lines is high, which may result in that the overall FF (fill factor) of the assembly cannot be improved, and the power gain is not significant.
Disclosure of Invention
In order to solve the defects of the prior art, the invention provides a welding method of a battery piece and a photovoltaic prefabricated part, wherein grid lines are arranged on the surface of the battery piece; the photovoltaic prefabricated part comprises glass, a first adhesive film and a metal wire which are sequentially laminated and fixed; the welding method comprises the following steps:
covering a layer of alloy on the surface of the grid line of the cell piece and/or the surface of the metal line of the photovoltaic prefabricated part;
the method comprises the following steps of (1) stacking and fixing a battery piece on a photovoltaic prefabricated part, and enabling a grid line of the battery piece to be correspondingly contacted with a metal line of the photovoltaic prefabricated part through an alloy;
and (3) pressurizing and heating the alloy to weld the alloy with the corresponding grid line and the corresponding metal line, so that the corresponding grid line and the corresponding metal line form ohmic contact.
The specific steps of coating a layer of alloy on the surface of a grid line of a cell piece and coating a layer of alloy on the surface of a metal line of a photovoltaic prefabricated member are shown in an example.
The invention has the advantages and beneficial effects that: the welding method of the cell and the photovoltaic prefabricated member is provided, the grid line of the cell and the metal line of the photovoltaic prefabricated member can form stable ohmic contact, the contact resistance between the cell and the metal line is reduced, and therefore the overall FF and the power of a photovoltaic assembly are improved.
The method can avoid the liquid alloy from polluting other areas of the cell in the process of covering the surface of the grid line of the cell with the layer of alloy.
The method can avoid the liquid alloy from polluting other areas of the photovoltaic prefabricated member in the process of covering the surface of the metal wire of the photovoltaic prefabricated member with the layer of alloy.
The invention can combine the metal wire embedding step and the metal wire alloy coating step of the photovoltaic prefabricated part in the same procedure for synchronous operation, can improve the coating efficiency and can meet the speed requirement of mass production.
Detailed Description
The following examples are provided to further illustrate embodiments of the present invention. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
The invention provides a preparation method of a photovoltaic module, which comprises the following steps:
taking a cell and a photovoltaic prefabricated part; grid lines are arranged on the surface of the battery piece and protrude out of the surface of the battery piece (the height of the grid lines protruding out of the surface of the battery piece is 2-20 microns, preferably 10-20 microns); the photovoltaic prefabricated part comprises glass, a first adhesive film (high-transmittance EVA (ethylene vinyl acetate) or POE (polyolefin elastomer) adhesive film) and a metal wire which are sequentially laminated and fixed, and the preparation process of the photovoltaic prefabricated part comprises the step of embedding the metal wire into the first adhesive film; covering a layer of alloy on the surface of the grid line of the cell piece and/or the surface of the metal line of the photovoltaic prefabricated part; then, the cell pieces are stacked and fixed on the photovoltaic prefabricated part (the grid lines of the cell pieces face downwards, and the metal lines of the photovoltaic prefabricated part face upwards), so that the grid lines of the cell pieces are correspondingly contacted with the metal lines of the photovoltaic prefabricated part through the alloy; then, the alloy is subjected to pressure heating (infrared heating can be adopted for heating) to complete the welding of the alloy and the corresponding grid line and the corresponding metal line, so that the corresponding grid line and the corresponding metal line form stable ohmic contact;
then, sequentially laminating a second adhesive film (high-resistance adhesive film) and a back plate on the battery piece;
and then carrying out component lamination on the photovoltaic prefabricated part, the battery piece, the second adhesive film and the back plate which are sequentially stacked, so that the photovoltaic prefabricated part, the battery piece, the second adhesive film and the back plate are bonded into a whole.
The method comprises the following steps of coating a layer of alloy on the surface of a grid line of a cell and coating a layer of alloy on the surface of a metal line of a photovoltaic prefabricated part, wherein the specific steps are as follows:
a) The method for coating the alloy on the surface of the grid line of the cell comprises the following steps:
a1 Heating the alloy to a liquid state, coating the liquid alloy on the grid line surface of the cell to finish coating a layer of alloy on the grid line surface of the cell;
more specifically:
coating liquid alloy on the surface of the grid line of the cell piece in a spraying, roll coating, spot plating or screen printing mode; and the liquid alloy is coated along the extending direction of the grid lines, and the coating width of the liquid alloy is not larger than the width of the grid lines, so that the pollution of other areas of the battery piece caused by the overflow of the coated liquid alloy is avoided.
A2 Heating the alloy to be in a liquid state, coating a welding-assistant material on the grid line surface of the battery piece, so that the liquid alloy is attached to the grid line surface coated with the welding-assistant material, and finishing coating a layer of alloy on the grid line surface of the battery piece;
more specifically, the method for finishing the attachment of the liquid alloy on the surface of the grid line coated with the welding assistant material comprises the following steps:
a21 After the surface of the grid line of the cell is coated with the welding-assistant material, the liquid level of the liquid alloy is in a static state, the cell is horizontally arranged (the grid line of the cell is downward) and then moves downward (the downward movement distance precision of the cell is micron-sized, and in the downward movement process, the contact of the grid line and the liquid level of the liquid alloy is observed through a microscope), only the grid line protruding out of the surface of the cell is in contact with the liquid level of the liquid alloy, and the attachment of the liquid alloy on the surface of the grid line coated with the welding-assistant material is completed;
a22 After the surface of the grid line of the cell is coated with the welding-assistant material, the cell is completely immersed into the liquid alloy and the immersion time is controlled, so that the liquid alloy is only adhered to the surface of the grid line coated with the welding-assistant material and is not adhered to other areas of the cell, and the liquid alloy is adhered to the surface of the grid line coated with the welding-assistant material; more specifically, the immersion time is controlled to be 1-2 seconds, so that the phenomenon that the liquid alloy is adhered to other areas of the cell to form pollution due to overlong immersion time is avoided;
a23 After the surface of the grid line of the cell is coated with the welding-assistant material, pouring the liquid alloy on the surface of the cell (the grid line of the cell is upward) so that the liquid alloy is only adhered to the surface of the grid line coated with the welding-assistant material and is not adhered to other areas of the cell, and finishing the adhesion of the liquid alloy on the surface of the grid line coated with the welding-assistant material; more specifically, the liquid alloy is kept in a high-temperature state during casting, and the alloy is prevented from solidifying.
B) Finishing the covering of the metal wire surface of the photovoltaic prefabricated member with a layer of alloy, comprising the following steps:
b1 Heating the alloy to a liquid state, and coating the liquid alloy on the surface of the metal wire in the process of embedding the metal wire into the first adhesive film to finish coating the metal wire surface of the photovoltaic prefabricated member with a layer of alloy;
more specifically:
coating the liquid alloy on the surface of the metal wire in a spraying, roll coating, spot plating or screen printing mode; coating the liquid alloy along the extending direction of the metal wire, and enabling the coating width of the liquid alloy to be not larger than the width of the metal wire, so that the phenomenon that the coated liquid alloy overflows to cause pollution to other areas of the photovoltaic prefabricated part is avoided;
and when the metal wire is embedded into the first adhesive film, the coating device coats the liquid alloy along with the metal wire, when the metal wire is embedded, the surface of the metal wire is covered with a layer of alloy along with the metal wire, the embedding and the coating are combined in the same procedure and are synchronously carried out, and the coating efficiency is high.
B2 Heating the alloy to a liquid state, and after finishing embedding the metal wire into the first adhesive film, coating the liquid alloy on the surface of the metal wire to finish coating the metal wire surface of the photovoltaic prefabricated member with a layer of alloy;
more specifically:
coating the liquid alloy on the surface of the metal wire in a spraying, roll coating, spot plating or screen printing mode; and the liquid alloy is coated along the extending direction of the metal wire, and the coating width of the liquid alloy is not larger than that of the metal wire, so that the phenomenon that the coated liquid alloy overflows to cause pollution to other areas of the photovoltaic prefabricated member is avoided.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, it is possible to make various improvements and modifications without departing from the technical principle of the present invention, and these improvements and modifications should also be considered as the protection scope of the present invention.
Claims (16)
1. According to the welding method of the cell and the photovoltaic prefabricated part, grid lines are arranged on the surface of the cell; the photovoltaic prefabricated part comprises glass, a first adhesive film and a metal wire which are sequentially laminated and fixed; the welding method is characterized by comprising the following steps:
covering a layer of alloy on the surface of the grid line of the cell and/or the surface of the metal line of the photovoltaic prefabricated part;
the method comprises the following steps of (1) stacking and fixing a battery piece on a photovoltaic prefabricated part, and enabling a grid line of the battery piece to be correspondingly contacted with a metal line of the photovoltaic prefabricated part through an alloy;
and (3) pressurizing and heating the alloy to weld the alloy with the corresponding grid line and the corresponding metal line, so that the corresponding grid line and the corresponding metal line form ohmic contact.
2. The method for welding the cell slice and the photovoltaic prefabricated component as claimed in claim 1, wherein the alloy is heated to a liquid state, the liquid alloy is coated on the surface of the grid line of the cell slice, and the coating of the alloy on the surface of the grid line of the cell slice is completed.
3. The welding method of the battery piece and the photovoltaic prefabricated member as claimed in claim 2, wherein the step of coating the surface of the grid line of the battery piece with the liquid alloy is performed by spraying, roll coating, dot plating or screen printing; and coating the liquid alloy along the extending direction of the grid lines, wherein the coating width of the liquid alloy is not more than the width of the grid lines.
4. The method as claimed in claim 1, wherein the alloy is heated to a liquid state, the flux material is coated on the surface of the grid line of the cell, the liquid alloy is attached to the surface of the grid line coated with the flux material, and the coating of the alloy on the surface of the grid line of the cell is completed.
5. The method for welding the cell slice and the photovoltaic prefabricated component as claimed in claim 4, wherein the grid lines protrude out of the surface of the cell slice; and after the surface of the grid line of the cell is coated with the welding-assistant material, the liquid level of the liquid alloy is in a static state, the cell is horizontally placed and then moves downwards, only the grid line protruding out of the surface of the cell is in contact with the liquid level of the liquid alloy, and the liquid alloy is attached to the surface of the grid line coated with the welding-assistant material.
6. The method for welding a cell to a photovoltaic preform as claimed in claim 5, wherein the distance precision of the downward movement of the cell is in the order of micrometers.
7. The method as claimed in claim 5, wherein the height of the grid line protruding from the surface of the cell is 2-20 μm.
8. The method for welding the cell and the photovoltaic prefabricated member according to claim 5, wherein the contact between the grid line and the liquid level of the liquid alloy is observed through a microscope during the downward movement of the cell.
9. The method for welding the battery piece and the photovoltaic prefabricated member as claimed in claim 4, wherein after the surface of the grid line of the battery piece is coated with the welding-assistant material, the battery piece is completely immersed in the liquid alloy, and the immersion time is controlled, so that the liquid alloy is only adhered to the surface of the grid line coated with the welding-assistant material and is not adhered to other areas of the battery piece, and the adhesion of the liquid alloy to the surface of the grid line coated with the welding-assistant material is completed.
10. The method for welding a cell plate to a photovoltaic preform according to claim 9, wherein the immersion time is controlled to be 1 to 2 seconds.
11. The method for welding the battery piece and the photovoltaic prefabricated part as claimed in claim 4, wherein after the surface of the grid line of the battery piece is coated with the welding-assistant material, the liquid alloy is poured on the surface of the battery piece, so that the liquid alloy is only adhered to the surface of the grid line coated with the welding-assistant material and is not adhered to other areas of the battery piece, and the liquid alloy is attached to the surface of the grid line coated with the welding-assistant material.
12. The method of claim 11, wherein the liquid alloy is maintained at a high temperature during casting to prevent solidification of the alloy.
13. The method for welding a cell slice to a photovoltaic preform according to claim 1, wherein the process for manufacturing the photovoltaic preform comprises: embedding the metal wire into the first adhesive film; heating the alloy to be in a liquid state, coating the liquid alloy on the surface of the metal wire in the process of embedding the metal wire into the first adhesive film or after the metal wire is embedded into the first adhesive film, and finishing coating the alloy on the surface of the metal wire of the photovoltaic prefabricated part.
14. The method for welding the battery plate and the photovoltaic prefabricated member according to claim 13, wherein the coating of the liquid alloy on the surface of the metal wire is performed by spraying, roll coating, spot plating or screen printing; and coating the liquid alloy along the extending direction of the metal wire, wherein the coating width of the liquid alloy is not more than the width of the metal wire.
15. The method for welding a battery piece and a photovoltaic prefabricated member according to claim 13, wherein the step of coating the surface of the metal wire with the liquid alloy is completed in the process of embedding the metal wire into the first adhesive film; and when the metal wire is embedded into the first adhesive film, the coating device is used for coating the liquid alloy along with the metal wire, and when the metal wire is embedded, the surface of the metal wire is also covered with a layer of alloy along with the metal wire.
16. The method for welding the cell slice and the photovoltaic prefabricated member as claimed in claim 1, wherein the alloy is heated by infrared heating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211128313.6A CN115302120A (en) | 2022-09-16 | 2022-09-16 | Welding method of battery piece and photovoltaic prefabricated part |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211128313.6A CN115302120A (en) | 2022-09-16 | 2022-09-16 | Welding method of battery piece and photovoltaic prefabricated part |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115302120A true CN115302120A (en) | 2022-11-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211128313.6A Pending CN115302120A (en) | 2022-09-16 | 2022-09-16 | Welding method of battery piece and photovoltaic prefabricated part |
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| CN (1) | CN115302120A (en) |
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