Special circular photovoltaic welding strip for HJT photovoltaic module

Abstract

The invention relates to a special circular photovoltaic solder strip for an HJT photovoltaic module, which comprises a conductive substrate and a solder layer, the solder layer is attached to the outer surface of the conductive substrate, the conductive substrate is a copper wire, a groove is pressed on the surface of the copper wire, the inner surface of the solder layer permeates into the groove, and the solder layer comprises 60%-63% of tin and 37%-40% of lead. The subfissure rate and the fragment rate of the assembly are effectively reduced, the battery power loss is reduced, the welding effect is improved, the safety performance in the production process is enhanced, the welding strip forming rate is increased, the melting point of a welding strip welding flux layer is reduced, the conductivity is improved, the production efficiency is improved, and the energy consumption is reduced.

Description

Technical Field

[0001] The invention relates to a photovoltaic welding ribbon, in particular to a circular photovoltaic welding ribbon dedicated to a HJT photovoltaic module. Background Art

[0002] In recent years, with my country vigorously promoting the photovoltaic power generation industry, HJT batteries have shown great application prospects due to their low energy consumption, small temperature coefficient, and simple process flow. HJT batteries, or amorphous silicon thin-film heterojunction batteries, have higher conversion efficiency, stronger power generation capacity, and greater room for efficiency improvement compared to other technologies. They are one of the battery technologies with great development potential in the photovoltaic industry. In recent years, thanks to technological breakthroughs and cost reductions, large-scale production and application of HJT batteries have gradually become a reality. In 2022, companies including Aikon Technology, Risen Energy, and Baoxin Technology have all released HJT battery-related projects, with an expansion scale of about 25GW. With the further improvement of technology and production capacity, the price of HJT batteries will continue to decline, making them more competitive in the market. With the large-scale application of HJT batteries, related product research and development and manufacturing chains will continue to improve, thereby further promoting the development of the industry.

[0003] The welding temperature of HJT cells is generally between 150-190℃. Conventional welding ribbons have high welding temperatures and are difficult to meet the packaging requirements of HJT cell modules. They are prone to warping, deformation, and breakage, resulting in reduced module yield or increased rework rates. Therefore, the development of circular photovoltaic welding ribbons specifically for HJT photovoltaic modules meets the requirements of industry development. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a circular photovoltaic welding ribbon dedicated to a HJT photovoltaic module.

[0005] The technical solution adopted in the present invention is: A circular photovoltaic welding strip specially used for HJT photovoltaic modules comprises a conductive substrate and a solder layer, wherein the solder layer is attached to the outer surface of the conductive substrate, the conductive substrate is a copper wire, a groove is pressed on the surface of the copper wire, the inner surface of the solder layer penetrates into the groove, and the solder layer comprises 60% to 63% tin and 37% to 40% lead.

[0006] As a further improvement of the above technical solution, the diameter of the welding strip is 0.255 mm to 0.275 mm.

[0007] As a further improvement of the above technical solution, the diameter of the copper wire is 0.225 mm to 0.235 mm.

[0008] As a further improvement of the above technical solution, the resistivity of the welding strip is less than or equal to 2.25×10-8Ω•m.

[0009] As a further improvement of the above technical solution, the tensile strength of the welding strip is greater than or equal to 150 MPa, and the yield strength is 58-70 MPa.

[0010] As a further improvement of the above technical solution, the elongation of the welding strip is less than or equal to 20%.

[0011] The advantages of the present invention are: By adopting the circular photovoltaic welding strip specially used for HJT photovoltaic modules of the present invention, the hidden crack and fragmentation rate of the modules can be effectively reduced, the battery power loss can be reduced, the welding effect can be improved, the safety performance of the production process can be enhanced, the welding strip forming rate can be improved, the melting point of the welding strip solder layer can be reduced, the conductivity can be improved, the production efficiency can be improved, and the energy consumption can be reduced. DETAILED DESCRIPTION

[0012] The embodiments described in the present invention are only a part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Example 1

[0013] A circular photovoltaic welding strip specially used for HJT photovoltaic modules comprises a conductive substrate and a solder layer, wherein the solder layer is attached to the outer surface of the conductive substrate, the conductive substrate is a copper wire, a groove is pressed on the surface of the copper wire, the inner surface of the solder layer penetrates into the groove, and the solder layer comprises 60% tin and 40% lead.

[0014] As a further improvement of the above technical solution, the diameter of the welding strip is 0.255 mm.

[0015] As a further improvement of the above technical solution, the diameter of the copper wire is 0.225 mm.

[0016] As a further improvement of the above technical solution, the resistivity of the welding strip is less than or equal to 2.25×10-8Ω•m.

[0017] As a further improvement of the above technical solution, the tensile strength of the welding strip is greater than or equal to 150 MPa, and the yield strength is 58-70 MPa.

[0018] As a further improvement of the above technical solution, the elongation of the welding strip is less than or equal to 20%. Example 2

[0019] A circular photovoltaic welding ribbon specially used for HJT photovoltaic modules comprises a conductive substrate and a solder layer, wherein the solder layer is attached to the outer surface of the conductive substrate, the conductive substrate is a copper wire, a groove is pressed on the surface of the copper wire, the inner surface of the solder layer penetrates into the groove, and the solder layer comprises 63% tin and 37% lead.

[0020] As a further improvement of the above technical solution, the diameter of the welding strip is 0.275 mm.

[0021] As a further improvement of the above technical solution, the diameter of the copper wire is 0.235 mm.

[0022] As a further improvement of the above technical solution, the resistivity of the welding strip is less than or equal to 2.25×10-8Ω•m.

[0023] As a further improvement of the above technical solution, the tensile strength of the welding strip is greater than or equal to 150 MPa, and the yield strength is 58-70 MPa.

[0024] As a further improvement of the above technical solution, the elongation of the welding strip is less than or equal to 20%. Example 3

[0025] A circular photovoltaic welding strip specially used for HJT photovoltaic modules comprises a conductive substrate and a solder layer, wherein the solder layer is attached to the outer surface of the conductive substrate, the conductive substrate is a copper wire, a groove is pressed on the surface of the copper wire, the inner surface of the solder layer penetrates into the groove, and the solder layer comprises 61% tin and 39% lead.

[0026] As a further improvement of the above technical solution, the diameter of the welding strip is 0.26 mm.

[0027] As a further improvement of the above technical solution, the diameter of the copper wire is 0.23 mm.

[0028] As a further improvement of the above technical solution, the resistivity of the welding strip is less than or equal to 2.25×10-8Ω•m.

[0029] As a further improvement of the above technical solution, the tensile strength of the welding strip is greater than or equal to 150 MPa, and the yield strength is 58-70 MPa.

[0030] As a further improvement of the above technical solution, the elongation of the welding strip is less than or equal to 20%.

[0031] A circular photovoltaic welding ribbon specially used for HJT photovoltaic modules is used to effectively reduce the hidden cracks and fragmentation rate of the modules, reduce battery power loss, improve welding effect, enhance the safety performance of the production process, increase the welding ribbon forming rate, reduce the melting point of the welding ribbon solder layer, improve the conductivity, improve production efficiency and reduce energy consumption.

[0032] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A circular photovoltaic welding ribbon for HJT photovoltaic modules, characterized in that: It includes a conductive substrate and a solder layer, wherein the solder layer is attached to the outer surface of the conductive substrate, the conductive substrate is a copper wire, a groove is pressed on the surface of the copper wire, the inner surface of the solder layer penetrates into the groove, and the solder layer includes 60% to 63% tin and 37% to 40% lead.

2. The circular photovoltaic welding ribbon for HJT photovoltaic modules according to claim 1, characterized in that: The diameter of the welding strip is 0.255 mm to 0.275 mm.

3. The circular photovoltaic welding ribbon for HJT photovoltaic modules according to claim 1, characterized in that: The diameter of the copper wire is 0.225 mm to 0.235 mm.

4. The circular photovoltaic welding ribbon for HJT photovoltaic modules according to claim 1, characterized in that: The resistivity of the welding strip is less than or equal to 2.25×10-8Ω•m.

5. The circular photovoltaic welding ribbon for HJT photovoltaic modules according to claim 1, characterized in that: The tensile strength of the welding strip is greater than or equal to 150 MPa, and the yield strength is 58-70 MPa.

6. The circular photovoltaic welding ribbon for HJT photovoltaic modules according to claim 1, characterized in that: The elongation of the welding strip is less than or equal to 20%.