CN109935651B - Photovoltaic solder strip and manufacturing method thereof - Google Patents
Photovoltaic solder strip and manufacturing method thereof Download PDFInfo
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- CN109935651B CN109935651B CN201910276101.4A CN201910276101A CN109935651B CN 109935651 B CN109935651 B CN 109935651B CN 201910276101 A CN201910276101 A CN 201910276101A CN 109935651 B CN109935651 B CN 109935651B
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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 relates to the field of metal processing, in particular to a photovoltaic solder strip and a manufacturing method thereof. The welding strip is made of pure aluminum, is 0.05-0.40 mm in thickness and 2.0-30.0 mm in width, is prepared from an aluminum wire through rolling and annealing treatment, and the annealing treatment comprises short-circuit annealing and rapid cooling. The aluminum strip can meet the requirements of the welding strip on the conductivity, the yield strength and the tensile strength, and can reduce the production cost. The preparation method comprises the following steps: rolling the aluminum wire into an aluminum strip, cleaning and annealing; the annealing treatment comprises short circuit annealing and rapid cooling; the annealing speed of short circuit annealing is 10-90 m/min, the annealing current is 20-52A, and the annealing time is 1.4-12 s. The preparation method can control the annealing temperature of the photovoltaic solder strip by adjusting the annealing current and the annealing speed, so that the obtained aluminum strip has good yield strength and tensile strength, and the preparation method has the advantages of simple production process, short-circuit annealing time and capability of greatly saving time cost.
Description
Technical Field
The invention relates to the field of metal processing, in particular to a photovoltaic solder strip and a manufacturing method thereof.
Background
The photovoltaic welding strip is an important component of a photovoltaic module (a solar panel), and is welded on a cell slice to form a cell string, and then the cell string is connected, so that current generated by the cell slice is collected and output to the outside through a junction box, and the photovoltaic welding strip plays an important role in connecting the cell slice and collecting and transmitting electric energy converted from the cell slice in the photovoltaic module.
The conductivity and tensile resistance of the photovoltaic solder strip directly influence the current collection efficiency and connection condition of the photovoltaic module respectively. Therefore, the base material of the current photovoltaic solder strip is mainly copper, and alloy materials such as tin-silver-copper alloy, tin-lead alloy or tin-copper alloy and the like are used for hot dipping or electroplating around the copper strip for about 15-30 microns in thickness. But the raw materials of copper and tin are relatively high in price, so that the production cost of the photovoltaic solder strip is indirectly increased.
Disclosure of Invention
The invention provides a photovoltaic solder strip, aiming at the problem that the production cost of the photovoltaic solder strip made of copper and tin is relatively high.
The invention also provides a manufacturing method of the photovoltaic solder strip.
In order to achieve the purpose of the invention, the embodiment of the invention adopts the following technical scheme:
a photovoltaic solder strip is made of pure aluminum, the thickness of the solder strip is 0.05-0.40 mm, and the width of the solder strip is 2.0-30.0 mm; the welding strip is prepared by rolling and annealing aluminum wires, wherein the annealing treatment comprises short-circuit annealing and rapid cooling, the annealing speed is 10-90 m/min, the annealing current is 20-52A, and the annealing time is 1.4-12 s.
The conductive capacity of the aluminum material is second to that of copper, and pure aluminum is selected as the material of the welding strip, so that the requirement of the welding strip on the conductive capacity can be met; meanwhile, the raw material cost of the aluminum is relatively low, and the production cost of the welding strip can be reduced. The short circuit annealing parameters defined by the invention can enable the aluminum strip with the specification to reach the annealing temperature of 300-450 ℃ within seconds to tens of seconds, so that on one hand, the condition that the surface of the aluminum material is oxidized due to long-time annealing in the prior art can be avoided, on the other hand, the photovoltaic welding strip which is prepared by rapidly reaching the annealing temperature and rapidly cooling can have good yield strength and tensile strength, and the requirement of the welding strip on tensile force resistance can be met. And the shorter annealing time can obviously shorten the operation time and save the time cost and the production power cost. The annealing duration among the annealing parameters is related to the annealing speed, and the faster the annealing speed, the shorter the annealing duration. Due to the characteristic of easy oxidation of aluminum, the photovoltaic welding strip is more suitable for crystalline silicon photovoltaic modules and film modules.
The embodiment of the invention also provides a manufacturing method of the photovoltaic solder strip, which comprises the following operations: rolling the aluminum wire into an aluminum strip, cleaning and annealing; the annealing treatment comprises short circuit annealing and rapid cooling; the annealing speed of the short circuit annealing is 10-90 m/min, the annealing current is 20-52A, and the annealing time is 1.4-12 s.
The preparation method provided by the invention does not need to plate alloy materials on the welding strip, and the production process is simple; the photovoltaic solder strip can be controlled to reach the optimum annealing temperature range (300-450 ℃) within a short time by adjusting the annealing current and the annealing speed, the operation and the control are easy, and the annealing temperature is possibly too high to cause the aluminum strip to be blown or the temperature is too low to be completely annealed if the annealing current and the annealing speed are out of the range, so that the obtained solder strip is too hard to meet the requirements of yield strength and tensile strength. The short circuit annealing parameters are combined with rapid cooling, so that the prepared aluminum strip has good yield strength and tensile strength. The short-circuit annealing operation time adopted by the invention is short and can be completed within ten seconds, so that the time cost of the traditional aluminum strip annealing is greatly saved.
Preferably, the rapid cooling is rapid cooling in water to 15-50 ℃. This operation utilizes the higher specific heat capacity of water, will weld the area and cool down rapidly through modes such as erodeing or soaking, can make gained aluminium strip have better yield strength and tensile strength. As will be appreciated by those skilled in the art, rapid cooling is the operation of cooling the solder strip with water at the fastest rate, and is not an operation of natural cooling, slow cooling, etc.
Preferably, the annealing treatment further comprises drying the surface of the aluminum strip after cooling with nitrogen or inert air to prevent oxidation of the aluminum strip by oxygen.
Preferably, the manufacturing method further comprises the step of carrying out ultrasonic cleaning or chemical cleaning on the aluminum strip after the annealing treatment. Ultrasonic cleaning or chemical cleaning can get rid of aluminium area surface impurity, avoids impurity to arouse aluminium area surface oxidation.
Preferably, the reagent used for chemical cleaning is a cleaning agent containing an antioxidant and having a pH of 6-8. The antioxidant can prevent the aluminum strip from being oxidized in the cleaning process; the cleaning agent with neutral pH is not easy to chemically change with the aluminum strip, and the problems of surface oxidation and the like which possibly occur in the later storage process are avoided.
Preferably, the cleaning agent also contains benzotriazole and polyhydric alcohol. Benzotriazole has an anti-corrosion effect on aluminum and helps to keep the surface chemistry of the aluminum strip stable. The polyhydric alcohol can be used as a solvent and can improve the anti-corrosion effect of the benzotriazole alcohol.
Preferably, the manufacturing method further comprises drying the surface of the cleaned aluminum strip by using compressed air to remove the water after cleaning and prevent the aluminum strip from rusting.
Preferably, the manufacturing method further comprises the step of plastically packaging the annealed aluminum strip to enhance the stability of the aluminum strip in the storage process.
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.
Example 1
The embodiment provides a photovoltaic solder strip, and a manufacturing method thereof comprises the following steps:
1. rolling: and (3) placing the aluminum wire on a pay-off device, fastening an aluminum wire shaft, automatically threading the device, and introducing the aluminum wire (phi 0.4mm) into the compression roller. Rolling the aluminum wire into an aluminum strip with the thickness of 0.05mm and the width of 2.0mm according to the size of the aluminum wire;
2. cleaning: washing the aluminum powder on the surface of the aluminum strip by water and wiping;
3. annealing: short-circuit annealing is carried out on the aluminum strip, and the technological parameters of the short-circuit annealing are as follows:
rapidly cooling to 15-50 ℃ in purified water after annealing;
4. secondary cleaning: carrying out ultrasonic cleaning on the annealed and cooled aluminum strip;
5. and (3) drying: removing water drops on the surface of the aluminum strip by using compressed nitrogen;
6. packaging: and cutting the welding strip into required length, and then carrying out plastic package.
Example 2
The embodiment provides a photovoltaic solder strip, and a manufacturing method thereof comprises the following steps:
1. rolling: and (3) placing the aluminum wire on a pay-off device, fastening an aluminum wire shaft, automatically threading the device, and introducing the aluminum wire (phi 4.0mm) into the compression roller. Rolling the aluminum wire into an aluminum strip with the thickness of 0.40mm and the width of 30.0mm according to the size of the aluminum wire;
2. cleaning: washing the aluminum powder on the surface of the aluminum strip by water and wiping;
7. annealing: short-circuit annealing is carried out on the aluminum strip, and the technological parameters of the short-circuit annealing are as follows:
rapidly cooling to 15-50 ℃ in purified water after annealing;
3. secondary cleaning: chemically cleaning the annealed and cooled aluminum strip by using a cleaning agent containing an antioxidant (0.5 wt%), benzotriazole (0.3 wt%) and butanol and having a pH of 7;
4. and (3) drying: removing water drops on the surface of the aluminum strip by using compressed nitrogen;
5. packaging: and cutting the welding strip into required length, and then carrying out plastic package.
Example 3
The embodiment provides a photovoltaic solder strip, and a manufacturing method thereof comprises the following steps:
1. rolling: and (3) placing the aluminum wire on a pay-off device, fastening an aluminum wire shaft, automatically threading by the device, and introducing the aluminum wire (phi 1.0mm) into the compression roller. Rolling the aluminum wire into an aluminum strip with the thickness of 0.10mm and the width of 3.0mm according to the size of the aluminum wire;
2. cleaning: washing the aluminum powder on the surface of the aluminum strip by water and wiping;
3. annealing: short-circuit annealing is carried out on the aluminum strip, and the technological parameters of the short-circuit annealing are as follows:
rapidly cooling to 15-50 ℃ in purified water after annealing;
4. secondary cleaning: chemically cleaning the annealed and cooled aluminum strip by using a cleaning agent with the pH of 6, wherein the cleaning agent contains an antioxidant (1 wt%), benzotriazole (0.5 wt%), ethylene glycol;
5. and (3) drying: removing water drops on the surface of the aluminum strip by using compressed nitrogen;
6. packaging: and cutting the welding strip into required length, and then carrying out plastic package.
Examples of effects
The photovoltaic solder strips prepared in the above examples 1-3 were subjected to quality inspection, and the results are shown in table 1.
TABLE 1 quality test results for photovoltaic solder strips obtained in examples 1 to 3
| Inspection item | Example 1 | Example 2 | Example 3 |
| Aluminum content/% of substrate | 99.7 | 99.7 | 99.7 |
| Resistivity (m omega mm)2/m，20℃) | 28.3 | 28.3 | 28.3 |
| Thickness tolerance (mm) | 0.001 | 0.003 | 0.001 |
| Tolerance of width (mm) | 0.01 | 0.03 | 0.01 |
| Elongation (%) | 5.1 | 5.2 | 4.9 |
| Tensile strength (MPa) | 83 | 86 | 84 |
| Yield strength (MPa) | 58 | 59 | 56 |
As can be seen from the results in Table 1, the photovoltaic solder strip prepared by the preparation method provided by the invention has good resistivity and excellent tensile strength and yield strength.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents or improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (9)
1. A photovoltaic solder strip is characterized in that the solder strip is made of pure aluminum, the thickness of the solder strip is 0.05-0.40 mm, and the width of the solder strip is 2.0-30.0 mm; the welding strip is prepared by rolling and annealing aluminum wires, wherein the annealing treatment comprises short circuit annealing and rapid cooling, the annealing speed is 10-90 m/min, the annealing current is 20-52A, the annealing time is 1.4-12 s, and the annealing temperature is 300-450 ℃.
2. A method for manufacturing a photovoltaic solder strip according to claim 1, comprising the following operations: rolling the aluminum wire into an aluminum strip, cleaning and annealing; the annealing treatment comprises short circuit annealing and rapid cooling; the annealing speed of the short circuit annealing is 10-90 m/min, the annealing current is 20-52A, the annealing time is 1.4-12 s, and the annealing temperature is 300-450 ℃.
3. The method for manufacturing a photovoltaic solder strip according to claim 2, wherein the rapid cooling is rapid cooling in water to 15 to 50 ℃.
4. The method for manufacturing a photovoltaic solder strip according to claim 2, wherein the annealing treatment further comprises drying the surface of the aluminum strip after cooling with nitrogen or inert air.
5. The manufacturing method of the photovoltaic solder strip according to claim 2, further comprising subjecting the aluminum strip after the annealing treatment to ultrasonic cleaning or chemical cleaning.
6. The manufacturing method of the photovoltaic solder strip according to claim 5, wherein the chemical cleaning agent is a cleaning agent containing an antioxidant and having a pH of 6 to 7.
7. The method for manufacturing a photovoltaic solder strip according to claim 6, wherein the cleaning agent further contains benzotriazole and a polyhydric alcohol.
8. The manufacturing method of the photovoltaic solder strip according to claim 5, further comprising drying the surface of the aluminum strip after cleaning with compressed air.
9. The manufacturing method of the photovoltaic solder strip according to claim 2, further comprising plastic-sealing the aluminum strip after the annealing treatment.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910276101.4A CN109935651B (en) | 2019-04-08 | 2019-04-08 | Photovoltaic solder strip and manufacturing method thereof |
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