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CN-116053345-B - Interconnection welding strip

CN116053345BCN 116053345 BCN116053345 BCN 116053345BCN-116053345-B

Abstract

The application belongs to the technical field of photovoltaics. The application discloses an interconnection welding strip which comprises a core layer, a conductive layer and an outer layer. The core layer comprises a polymer material, the conductive layer is arranged on the outer side of the core layer, the outer layer is arranged on the outer side of the conductive layer, and the outer layer comprises at least one of low-temperature metal or low-temperature alloy. The interconnection welding strip takes the polymer material as the core layer of the interconnection welding strip, so that the stress of the interconnection welding strip at the bending position is reduced, and meanwhile, the extrusion stress between the welding strip and the battery piece is reduced. The problem that the battery piece is hidden to crack or break due to overlarge stress and extrusion stress when the interconnection welding strip is bent can be solved, and the reliability of the photovoltaic module is improved.

Inventors

  • CAO MINGJIE
  • YANG CHUFENG
  • ZHOU GUANGDA

Assignees

  • 杭州福斯特应用材料股份有限公司

Dates

Publication Date
20260512
Application Date
20230109

Claims (7)

  1. 1. An interconnect strap, comprising: A core layer comprising a polymeric material comprising at least one of PP, PC, PET or PA; the conductive layer is arranged on the outer side of the core layer and comprises one or an alloy of at least two of copper, silver or aluminum; And the outer layer is arranged on the outer side of the conductive layer and comprises at least one of low-temperature metal or low-temperature alloy, and the melting point of the low-temperature metal or the low-temperature alloy is less than or equal to 180 ℃.
  2. 2. The interconnect strap of claim 1, wherein: The cross section of the core layer is at least one of round, rectangular or triangular.
  3. 3. The interconnect strap of claim 2, wherein: When the cross section of the core layer is circular, the diameter of the conductive layer is D, and the diameter of the core layer is D, wherein 1-delta 4 is less than 0.95, and delta=d/D.
  4. 4. The interconnect strap of claim 2, wherein: when the cross section of the core layer is rectangular or triangular, the rectangular width or the triangular bottom side length of the conductive layer is B, the rectangular height or the triangular height of the conductive layer is H, the rectangular width or the triangular bottom side length of the core layer is B, and the rectangular height or the triangular height of the core layer is H; wherein 1- αβ 3 <0.95, α=b/B, β=h/H.
  5. 5. The interconnect strap of claim 1, wherein: The low-temperature alloy comprises at least one of tin-lead alloy, tin-bismuth-silver alloy, tin-indium alloy or tin-lead-indium alloy.
  6. 6. The interconnect strap of claim 1, wherein: the area of the cross section of the conductive layer is S1, the area of the cross section of the core layer is S2, and the ratio S1/S2 of S1 to S2 is more than or equal to 1.
  7. 7. A photovoltaic module comprising at least one first cell, at least one second cell, and an interconnection strap according to any one of claims 1-6, wherein the interconnection strap is used to connect the first cell and the second cell.

Description

Interconnection welding strip Technical Field The invention belongs to the technical field of photovoltaics, and particularly relates to an interconnection welding strip. Background The interconnection welding strip is a conductive lead strip of the solar cell, and the conductive lead strip is used for leading out and conveying electric energy converted from light energy to a silicon chip to electric equipment, also has the functions of heat dissipation and mechanical manufacturing, and is one of functional important components of the solar photovoltaic cell. Currently, the solar cells of crystalline silicon solar cell modules are basically connected in series in the form of tin-plated brazing tapes, and the brazing tapes are welded and connected with the front surfaces of the solar cells and then extend to the back surfaces of the adjacent solar cells. However, in the process of implementing the technical solution in the embodiment of the present application, the present inventors have found that the above technology has at least the following technical problems: Although the ductility of copper is better, if the gap of the battery piece is shortened, larger stress exists at the bending part, and in the lamination process of the component, the extrusion stress of the welding strip at the bending part to the battery piece is larger, so that the battery piece is easy to be hidden and cracked or even broken. At the non-bending position, the extrusion stress between the welding strip and the battery piece can increase the hidden cracking or piece breaking risk of the battery piece. Disclosure of Invention The embodiment of the application solves the problems of larger stress at the welding belt and larger extrusion stress on the battery in the prior art by providing the interconnection welding belt, ensures that the battery piece cannot be hidden and broken, and improves the reliability of the assembly. The application provides an interconnection welding strip which comprises a core layer, a conductive layer and an outer layer, wherein the core layer comprises a polymer material, the conductive layer is arranged on the outer side of the core layer, the outer layer is arranged on the outer side of the conductive layer, and the outer layer comprises at least one of low-temperature metal or low-temperature alloy. Further, the cross section of the core layer is at least one of circular, rectangular or triangular. Further, when the cross section of the core layer is circular, the diameter of the conductive layer is D and the diameter of the core layer is D, wherein 1- δ 4 <0.95, δ=d/D. Further, when the cross section of the core layer is rectangular or triangular, the rectangular width or the triangular bottom side length of the conductive layer is B, the rectangular height or the triangular height of the conductive layer is H, the rectangular width or the triangular bottom side length of the core layer is B, and the rectangular height or the triangular height of the core layer is H; wherein 1- αβ 3 <0.95, α=b/B, β=h/H. Further, the polymer material has a melting point of 140 ℃ or higher. Further, the polymeric material includes at least one of PP, PC, PET or PA. Further, the melting point of the low-temperature metal or low-temperature alloy is less than or equal to 180 ℃; Preferably, the low temperature alloy comprises at least one of a tin-lead alloy, a tin-bismuth-silver alloy, a tin-indium alloy or a tin-lead-indium alloy. Further, the conductive layer includes one or an alloy of at least two of copper, silver, or aluminum. Further, the area of the cross section of the conductive layer is S1, the area of the cross section of the core layer is S2, and the ratio S1/S2 of S1 to S2 is greater than or equal to 1. The application also provides a photovoltaic module, which comprises at least one first cell piece, at least one second cell piece and the interconnection welding strip, wherein the interconnection welding strip is used for connecting the first cell piece and the second cell piece. In summary, the embodiment of the application has at least the following beneficial effects: according to the application, the polymer is used as the core layer, so that the stress of the interconnection welding strip at the bending position is reduced, meanwhile, the extrusion stress between the strip and the battery piece is reduced, the battery piece is prevented from being hidden or broken in the lamination process, and the reliability of the assembly is improved. Drawings FIG. 1 is a schematic cross-sectional view of one implementation of an interconnect strap of the present application; FIG. 2 is a schematic cross-sectional view of a welding method of the battery plate; FIG. 3 is a schematic cross-sectional view of another implementation of an interconnect strap of the present application; FIG. 4 is a schematic cross-sectional view of another implementation of an interconnect strap of the present application; FIG. 5 is a s