CN111331214B - Welding method of cell for photovoltaic power generation - Google Patents
Welding method of cell for photovoltaic power generation Download PDFInfo
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- CN111331214B CN111331214B CN201911354622.3A CN201911354622A CN111331214B CN 111331214 B CN111331214 B CN 111331214B CN 201911354622 A CN201911354622 A CN 201911354622A CN 111331214 B CN111331214 B CN 111331214B
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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
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/0008—Soldering, e.g. brazing, or unsoldering specially adapted for particular articles or work
-
- 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
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/20—Preliminary treatment of work or areas to be soldered, e.g. in respect of a galvanic coating
- B23K1/203—Fluxing, i.e. applying flux onto surfaces
-
- 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
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/20—Preliminary treatment of work or areas to be soldered, e.g. in respect of a galvanic coating
- B23K1/206—Cleaning
-
- 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
- B23K3/00—Tools, devices, or special appurtenances for soldering, e.g. brazing, or unsoldering, not specially adapted for particular methods
- B23K3/02—Soldering irons; Bits
- B23K3/03—Soldering irons; Bits electrically heated
-
- 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
- B23K3/00—Tools, devices, or special appurtenances for soldering, e.g. brazing, or unsoldering, not specially adapted for particular methods
- B23K3/04—Heating appliances
-
- 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
- B23K3/00—Tools, devices, or special appurtenances for soldering, e.g. brazing, or unsoldering, not specially adapted for particular methods
- B23K3/08—Auxiliary devices therefor
-
- 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
- B23K3/00—Tools, devices, or special appurtenances for soldering, e.g. brazing, or unsoldering, not specially adapted for particular methods
- B23K3/08—Auxiliary devices therefor
- B23K3/082—Flux dispensers; Apparatus for applying flux
-
- 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
- B23K3/00—Tools, devices, or special appurtenances for soldering, e.g. brazing, or unsoldering, not specially adapted for particular methods
- B23K3/08—Auxiliary devices therefor
- B23K3/087—Soldering or brazing jigs, fixtures or clamping means
-
- 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
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
- B23K35/3612—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest with organic compounds as principal constituents
- B23K35/3613—Polymers, e.g. resins
-
- 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
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/36—Electric or electronic devices
-
- 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 welding method of a cell for photovoltaic power generation, which comprises the following steps of S1, preparing materials before welding: the equipment tool comprises an electric soldering iron, a soldering iron frame, an electric soldering table and a soldering iron sponge, and the materials mainly comprise a battery piece, a soldering strip and soldering flux; s2, solder strip processing: cleaning the surface of the welding strip, placing the welding strip in a soaking vessel, adding soldering flux for soaking for 6-8 minutes, taking out the welding strip, cleaning the surface of the welding strip to ensure that no soldering flux flows on the surface, and placing the welding strip in cotton cloth for storage after the cleaning is finished; s3, preheating an instrument: preheating the electric soldering iron to ensure that the temperature of the electric soldering iron reaches 360-370 ℃. According to the invention, the three-stage method is adopted in the process of preheating the heating table, so that the temperature of the battery piece placed on the heating table can reach more than 100 ℃, the battery piece is closer to the welding temperature, the damage of the battery piece caused by the overlarge temperature difference between the electric heating piece and the electric soldering iron is avoided, and the protection of the battery piece is facilitated.
Description
Technical Field
The invention relates to the technical field of battery welding, in particular to a welding method of a battery piece for photovoltaic power generation.
Background
The solar photovoltaic cell (photovoltaic cell for short) is used for directly converting solar energy into electric energy. Silicon solar cells with silicon as a substrate are widely used in the ground photovoltaic system at present and can be divided into monocrystalline silicon, polycrystalline silicon and amorphous silicon solar cells. In the aspects of comprehensive performances such as energy conversion efficiency, service life and the like, the monocrystalline silicon and polycrystalline silicon batteries are superior to the amorphous silicon batteries. Polycrystalline silicon has lower conversion efficiency than single crystal silicon, but is cheaper.
In the manufacturing process of the photovoltaic cell, a plurality of groups of cells need to be subjected to series welding after being subjected to single welding, in the whole process, the welding technology is directly connected with the quality of the photovoltaic cell, and in the existing welding process, the phenomenon of cell breakage is often easy to occur, so that the qualification rate is reduced.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides a welding method of a cell for photovoltaic power generation, which adopts a three-stage method in the process of preheating a heating table, so that the temperature of the cell placed on the heating table can reach over 100 ℃, the cell is closer to the welding temperature, the damage of the cell caused by overlarge temperature difference between an electric heating piece and an electric soldering iron is avoided, and the protection of the cell is facilitated.
In order to achieve the purpose, the invention provides the following technical scheme: a welding method of a cell for photovoltaic power generation comprises the following steps:
s1, preparing materials before welding: the equipment tool comprises an electric soldering iron, a soldering iron frame, an electric soldering table and a soldering iron sponge, and the materials mainly comprise a battery piece, a soldering strip and soldering flux;
s2, solder strip processing: cleaning the surface of the welding strip, placing the welding strip in a soaking vessel, adding soldering flux for soaking for 6-8 minutes, taking out the welding strip, cleaning the surface of the welding strip to ensure that no soldering flux flows on the surface, and placing the welding strip in cotton cloth for storage after the cleaning is finished;
s3, preheating an instrument: preheating an electric iron to enable the temperature of the electric iron to reach 360-370 ℃, and then primarily preheating a heating table to enable the temperature of the heating table to reach 40-50 ℃;
s4, preheating the battery piece: placing a battery piece to be welded on a preheating heating table for preheating to enable the temperature of the surface of the battery piece to reach 30-40 ℃, and then heating the heating table in two stages to enable the temperature of the battery piece to exceed 100 ℃;
s5, single welding of the battery piece: laying and welding two groups of welding strips at the main grid line on the front surface of the battery piece;
s6, series welding of battery pieces: arranging the single welded battery pieces on a template according to the installation requirement, and then welding the single battery pieces in series;
s6, cooling: and (4) placing the battery pieces after series welding in a cooling device, and carrying out three-stage cooling.
Preferably, in the step S4, the heating stage is heated in two stages in the battery piece preheating process, including a first stage of heating the heating stage to 70-80 ℃, and a second stage of heating the heating stage to 100-110 ℃.
Preferably, in step S6, the first stage cooling is performed by setting the cooling temperature at 60 ℃ to 70 ℃, the second stage cooling is performed by setting the cooling temperature at 30 ℃ to 40 ℃, and the third stage cooling is performed by setting the cooling temperature at 0 ℃ to 10 ℃.
Preferably, the welding of the battery pieces in steps S5 and S6 is performed by soldering, wherein the length of the solder strip is 2.1-2.5 times the length of the side of the battery parallel to the electrode of the battery plate.
Preferably, the soldering flux consists of the following components in parts by weight:
10-15 parts of rosin glyceride, 4-5 parts of 2-methylimidazole, 1-2 parts of concentrated hydrochloric acid, 6-7 parts of amine chloride, 2-4 parts of fatty acid diethanolamide, 7-15 parts of 70% ethanol, 15-20 parts of thermosetting resin and the balance of water.
Preferably, the soldering flux consists of the following components in parts by weight:
10 parts of rosin glyceride, 5 parts of 2-methylimidazole, 1 part of concentrated hydrochloric acid, 6 parts of amine chloride, 2 parts of fatty acid diethanolamide, 7 parts of 70% ethanol, 15 parts of thermosetting resin and the balance of water.
Preferably, the soldering flux consists of the following components in parts by weight:
15 parts of rosin glyceride, 4 parts of 2-methylimidazole, 2 parts of concentrated hydrochloric acid, 7 parts of amine chloride, 4 parts of fatty acid diethanolamide, 15 parts of 70% ethanol, 20 parts of thermosetting resin and the balance of water.
The invention has the technical effects and advantages that:
1. according to the invention, a three-stage method is adopted in the process of preheating the heating table, the heating table is firstly preliminarily heated to 30-40 ℃, then the battery piece is placed, the second part of heating is carried out to heat the heating table to 70-80 ℃, and finally the heating table is heated to 100-110 ℃, so that the temperature of the battery piece placed on the heating table can reach more than 100 ℃, the battery piece is closer to the welding temperature, the damage of the battery piece caused by overlarge temperature difference between the electric heating piece and the electric soldering iron is avoided, and the protection of the battery piece is facilitated.
2. According to the invention, in the cooling process after welding, sectional cooling is adopted, the cooling temperature is divided into 60-70 ℃, 30-40 ℃ and 0-10 ℃ which are sequentially decreased, the initial cooling adopts the temperature close to that of the battery piece, the internal stress generated by sudden temperature drop is avoided, the battery piece is damaged, the battery piece is better protected, and the welding qualification rate is improved.
3. The soldering flux has the advantages of reasonable formula and low cost, and is beneficial to reducing welding defects and improving welding quality.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A welding method of a cell for photovoltaic power generation comprises the following steps:
s1, preparing soldering flux: weighing 10 parts of rosin glyceride, 5 parts of 2-methylimidazole, 1 part of concentrated hydrochloric acid, 6 parts of amine chloride, 2 parts of fatty acid diethanolamide, 7 parts of 70% ethanol and 15 parts of thermosetting resin, introducing the concentrated hydrochloric acid, the amine chloride, the fatty acid diethanolamide and the 70% ethanol into a reaction kettle, stirring and mixing to fully mix and react, after stirring for 20 minutes, adding the rosin glyceride and the thermosetting resin, continuing stirring, after stirring, obtaining a mixed solution, adding a proper amount of water into the mixed solution to dilute, wherein the ratio of the mixed solution to the water is 1: 1.5, obtaining the soldering flux after the dilution is finished;
s2, preparing materials before welding: the equipment tool comprises an electric soldering iron, a soldering iron frame, an electric soldering table and a soldering iron sponge, and the materials mainly comprise a battery piece, a soldering strip and soldering flux;
s3, solder strip processing: cleaning the surface of the welding strip, placing the welding strip in a soaking vessel, adding soldering flux for soaking for 6-8 minutes, taking out the welding strip, cleaning the surface of the welding strip to ensure that no soldering flux flows on the surface, and placing the welding strip in cotton cloth for storage after the cleaning is finished;
s4, preheating an instrument: preheating an electric iron to enable the temperature of the electric iron to reach 360-370 ℃, and then primarily preheating a heating table to enable the temperature of the heating table to reach 40-50 ℃;
s5, preheating the battery piece: placing a battery piece to be welded on a preheating heating table for preheating to enable the temperature of the surface of the battery piece to reach 30-40 ℃, then heating the heating table in two stages, heating the heating table to 70-80 ℃, keeping the temperature for 8-13 minutes, and then continuing to heat to enable the heating table to heat to 100-110 ℃, wherein the temperature of the battery piece exceeds 100 ℃;
s6, single welding of the battery piece: laying and welding two groups of welding strips at the main grid line on the front surface of the battery piece;
s7, series welding of battery pieces: arranging the single welded battery pieces on a template according to the installation requirement, then welding the single battery pieces in series, and adopting a brazing welding mode, wherein the length of a welding strip is 2.1-2.5 times of the side length of a battery parallel to the electrode of the battery panel;
s8, cooling: placing the battery piece after series welding in a cooling device, carrying out three-stage cooling, wherein the first-stage cooling is carried out, the cooling temperature is set to be 60-70 ℃ so that the temperature of the battery piece is close to the temperature inside the cooling device, then the battery piece is cooled for 5-8 minutes, the second-stage cooling is carried out, the cooling temperature is set to be 30-40 ℃, the battery piece is cooled for 5-8 minutes, and finally the third-stage cooling is carried out, the cooling temperature is set to be 0-10 ℃, so that the temperature of the battery piece is recovered to the normal temperature and can be stopped;
example 2
A welding method of a cell for photovoltaic power generation comprises the following steps:
s1, preparing soldering flux: weighing 12 parts of rosin glyceride, 4.5 parts of 2-methylimidazole, 1.5 parts of concentrated hydrochloric acid, 6.5 parts of amine chloride, 3 parts of fatty acid diethanolamide, 11 parts of 70% ethanol and 18 parts of thermosetting resin, introducing the concentrated hydrochloric acid, the amine chloride, the fatty acid diethanolamide and the 70% ethanol into a reaction kettle, stirring and mixing to fully mix and react, after stirring for 20 minutes, adding the rosin glyceride and the thermosetting resin, continuing stirring, after stirring, obtaining a mixed solution, adding a proper amount of water into the mixed solution for dilution, wherein the ratio of the mixed solution to the water is 1: 1.5, obtaining the soldering flux after the dilution is finished;
s2, preparing materials before welding: the equipment tool comprises an electric soldering iron, a soldering iron frame, an electric soldering table and a soldering iron sponge, and the materials mainly comprise a battery piece, a soldering strip and soldering flux;
s3, solder strip processing: cleaning the surface of the welding strip, placing the welding strip in a soaking vessel, adding soldering flux for soaking for 6-8 minutes, taking out the welding strip, cleaning the surface of the welding strip to ensure that no soldering flux flows on the surface, and placing the welding strip in cotton cloth for storage after the cleaning is finished;
s4, preheating an instrument: preheating an electric iron to enable the temperature of the electric iron to reach 360-370 ℃, and then primarily preheating a heating table to enable the temperature of the heating table to reach 40-50 ℃;
s5, preheating the battery piece: placing a battery piece to be welded on a preheating heating table for preheating to enable the temperature of the surface of the battery piece to reach 30-40 ℃, then heating the heating table in two stages, heating the heating table to 70-80 ℃, keeping the temperature for 8-13 minutes, and then continuing to heat to enable the heating table to heat to 100-110 ℃, wherein the temperature of the battery piece exceeds 100 ℃;
s6, single welding of the battery piece: laying and welding two groups of welding strips at the main grid line on the front surface of the battery piece;
s7, series welding of battery pieces: arranging the single welded battery pieces on a template according to the installation requirement, then welding the single battery pieces in series, and adopting a brazing welding mode, wherein the length of a welding strip is 2.1-2.5 times of the side length of a battery parallel to the electrode of the battery panel;
s8, cooling: placing the battery piece after series welding in a cooling device, carrying out three-stage cooling, wherein the first-stage cooling is carried out, the cooling temperature is set to be 60-70 ℃ so that the temperature of the battery piece is close to the temperature inside the cooling device, then the battery piece is cooled for 5-8 minutes, the second-stage cooling is carried out, the cooling temperature is set to be 30-40 ℃, the battery piece is cooled for 5-8 minutes, and finally the third-stage cooling is carried out, the cooling temperature is set to be 0-10 ℃, so that the temperature of the battery piece is recovered to the normal temperature and can be stopped;
example 3
A welding method of a cell for photovoltaic power generation comprises the following steps:
s1, preparing soldering flux: weighing 15 parts of rosin glyceride, 4 parts of 2-methylimidazole, 2 parts of concentrated hydrochloric acid, 7 parts of amine chloride, 4 parts of fatty acid diethanolamide, 15 parts of 70% ethanol and 20 parts of thermosetting resin, introducing the concentrated hydrochloric acid, the amine chloride, the fatty acid diethanolamide and the 70% ethanol into a reaction kettle, stirring and mixing to fully mix and react, adding the rosin glyceride and the thermosetting resin after stirring for 20 minutes, continuing stirring, obtaining a mixed solution after stirring, adding a proper amount of water into the mixed solution to dilute, wherein the ratio of the mixed solution to the water is 1: 1.5, obtaining the soldering flux after the dilution is finished;
s2, preparing materials before welding: the equipment tool comprises an electric soldering iron, a soldering iron frame, an electric soldering table and a soldering iron sponge, and the materials mainly comprise a battery piece, a soldering strip and soldering flux;
s3, solder strip processing: cleaning the surface of the welding strip, placing the welding strip in a soaking vessel, adding soldering flux for soaking for 6-8 minutes, taking out the welding strip, cleaning the surface of the welding strip to ensure that no soldering flux flows on the surface, and placing the welding strip in cotton cloth for storage after the cleaning is finished;
s4, preheating an instrument: preheating an electric iron to enable the temperature of the electric iron to reach 360-370 ℃, and then primarily preheating a heating table to enable the temperature of the heating table to reach 40-50 ℃;
s5, preheating the battery piece: placing a battery piece to be welded on a preheating heating table for preheating to enable the temperature of the surface of the battery piece to reach 30-40 ℃, then heating the heating table in two stages, heating the heating table to 70-80 ℃, keeping the temperature for 8-13 minutes, and then continuing to heat to enable the heating table to heat to 100-110 ℃, wherein the temperature of the battery piece exceeds 100 ℃;
s6, single welding of the battery piece: laying and welding two groups of welding strips at the main grid line on the front surface of the battery piece;
s7, series welding of battery pieces: arranging the single welded battery pieces on a template according to the installation requirement, then welding the single battery pieces in series, and adopting a brazing welding mode, wherein the length of a welding strip is 2.1-2.5 times of the side length of a battery parallel to the electrode of the battery panel;
s8, cooling: and (2) placing the battery piece after series welding in cooling equipment, carrying out three-stage cooling, wherein the first-stage cooling is carried out, the cooling temperature is set to be 60-70 ℃ so that the temperature of the battery piece is close to the temperature inside the cooling equipment, then the battery piece is cooled for 5-8 minutes, the second-stage cooling is carried out, the cooling temperature is set to be 30-40 ℃, the battery piece is cooled for 5-8 minutes, and finally the third-stage cooling is carried out, the cooling temperature is set to be 0-10 ℃, so that the temperature of the battery piece is recovered to the normal temperature and can be stopped.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (4)
1. A welding method of a cell for photovoltaic power generation is characterized in that: the method comprises the following steps:
s1, preparing materials before welding: the equipment tool comprises an electric soldering iron, a soldering iron frame, an electric soldering table and a soldering iron sponge, and the materials mainly comprise a battery piece, a soldering strip and soldering flux;
s2, solder strip processing: cleaning the surface of the welding strip, placing the welding strip in a soaking vessel, adding soldering flux for soaking for 6-8 minutes, taking out the welding strip, cleaning the surface of the welding strip to ensure that no soldering flux flows on the surface, and placing the welding strip in cotton cloth for storage after the cleaning is finished; in the process, the soldering flux consists of the following components in parts by weight: 10-15 parts of rosin glyceride, 4-5 parts of 2-methylimidazole, 1-2 parts of concentrated hydrochloric acid, 6-7 parts of amine chloride, 2-4 parts of fatty acid diethanolamide, 7-15 parts of 70% ethanol, 15-20 parts of thermosetting resin and the balance of water;
s3, preheating an instrument: preheating an electric iron to enable the temperature of the electric iron to reach 360-370 ℃, and then primarily preheating a heating table to enable the temperature of the heating table to reach 40-50 ℃;
s4, preheating the battery piece: placing a battery piece to be welded on a preheating heating table for preheating to enable the temperature of the surface of the battery piece to reach 30-40 ℃, then heating the heating table in two stages, wherein the heating table is heated to 70-80 ℃ in the first stage, and the heating table is heated to 100-110 ℃ in the second stage to enable the temperature of the battery piece to exceed 100 ℃;
s5, single welding of the battery piece: laying and welding two groups of welding strips at the main grid line on the front surface of the battery piece;
s6, series welding of battery pieces: arranging the single welded battery pieces on a template according to the installation requirement, and then welding the single battery pieces in series;
s7, cooling: placing the battery pieces after series welding in a cooling device, and carrying out three-stage cooling: the first stage cooling is carried out, the cooling temperature is set to be 60-70 ℃, the second stage cooling is carried out, the cooling temperature is set to be 30-40 ℃, and the third stage cooling is carried out, wherein the cooling temperature is set to be 0-10 ℃.
2. The welding method of the cell sheet for photovoltaic power generation according to claim 1, characterized in that: the welding mode of the battery pieces in the steps S5 and S6 adopts brazing, wherein the length of the welding strip is 2.1-2.5 times of the side length of the battery parallel to the electrode of the battery plate.
3. The welding method of the cell sheet for photovoltaic power generation according to claim 1, characterized in that: the soldering flux consists of the following components in parts by weight:
10 parts of rosin glyceride, 5 parts of 2-methylimidazole, 1 part of concentrated hydrochloric acid, 6 parts of amine chloride, 2 parts of fatty acid diethanolamide, 7 parts of 70% ethanol, 15 parts of thermosetting resin and the balance of water.
4. The welding method of the cell sheet for photovoltaic power generation according to claim 1, characterized in that: the soldering flux consists of the following components in parts by weight:
15 parts of rosin glyceride, 4 parts of 2-methylimidazole, 2 parts of concentrated hydrochloric acid, 7 parts of amine chloride, 4 parts of fatty acid diethanolamide, 15 parts of 70% ethanol, 20 parts of thermosetting resin and the balance of water.
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