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CN-121985596-A - Photovoltaic module and preparation method thereof

CN121985596ACN 121985596 ACN121985596 ACN 121985596ACN-121985596-A

Abstract

The application discloses a photovoltaic module and a preparation method of the photovoltaic module, and belongs to the technical field of photovoltaic modules. The photovoltaic module comprises a battery piece, wherein an electrode is arranged on the surface of the battery piece and comprises a first slurry curing layer, the first slurry curing layer is at least positioned at the joint of the electrode and the electric connecting piece, the electric connecting piece is electrically connected with the electrode and comprises a substrate, a bonding layer and a second slurry curing layer, the bonding layer is coated on the surface of the substrate, and the second slurry curing layer is arranged on one side, close to the first slurry curing layer, of the bonding layer.

Inventors

  • HE BO
  • LIU YIKUN
  • Luo Pengdong
  • DUAN JUN
  • FANG LIANG

Assignees

  • 隆基绿能科技股份有限公司西咸新区分公司

Dates

Publication Date
20260505
Application Date
20251229

Claims (11)

  1. 1. A photovoltaic module, comprising: A battery piece (10), wherein an electrode is arranged on the surface of the battery piece (10); an electrical connection (20), the electrical connection (20) being electrically connected to the electrode; The electrode comprises a first slurry curing layer, and the first slurry curing layer is at least positioned at the joint of the electrode and the electric connecting piece; The electric connecting piece (20) comprises a base body (21), a bonding layer (22) and a second slurry curing layer (23), wherein the bonding layer (22) is coated on the surface of the base body (21), and the second slurry curing layer (23) is arranged on one side, close to the first slurry curing layer, of the bonding layer (22).
  2. 2. The photovoltaic module according to claim 1, characterized in that the material of the first paste solidified layer is the same as the material of the second paste solidified layer (23); or the organic matter content in the second slurry solidified layer (23) is smaller than the organic matter content in the first slurry solidified layer.
  3. 3. The photovoltaic module according to claim 1, characterized in that the bonding layer (22) comprises a layer of lead-tin alloy, the average width of the aggregates of lead atoms in the layer of lead-tin alloy being less than or equal to 3 microns.
  4. 4. The photovoltaic module according to claim 1, characterized in that the electrode comprises a collector grid line (11), the collector grid line (11) extending along a first direction (X), the first paste cured layer being provided at the junction of the collector grid line (11) and the electrical connection (20); Or the electrode comprises a collector grid line (11) and a collector grid line (12), wherein the collector grid line (11) extends along the first direction (X), the collector grid line (12) extends along the second direction (Y), the first slurry curing layer is arranged at the joint of the collector grid line (12) and the electric connector (20), and the second direction (Y) is intersected with the first direction (X).
  5. 5. The photovoltaic module according to claim 1, characterized in that the second paste solidified layer (23) comprises a number of second paste solidified sub-blocks intermittently distributed on the joining layer (22) along the extension direction of the electrical connection (20).
  6. 6. The photovoltaic module according to claim 4, characterized in that, in the first direction (X), the electrical connection (20) has a width L1, the second paste solidified layer (23) has a width L2, satisfying L2 being equal to or greater than 1/2X L1; and/or, in the first direction (X), the width of the bus gate line (12) is L3, so that L2 is greater than or equal to 2×l3; and/or L3 is more than or equal to 100 mu m, and L2 is more than or equal to 200 mu m.
  7. 7. The photovoltaic module according to claim 4, wherein in a thickness direction of the photovoltaic module, a thickness of the bus bar line (12) is H1, satisfying 5 μm and H1 and 30 μm; and/or the thickness of the second slurry solidified layer (23) is H2, and H2 is more than or equal to 2 microns and less than or equal to 20 microns; and/or the thickness of the bonding layer (22) is H3, and H3 is more than or equal to 10 mu m and less than or equal to 30 mu m; And/or, H1> H2 is satisfied; And/or H1/H2 is more than or equal to 0.5 and less than or equal to 20.
  8. 8. The photovoltaic module of any of claims 1-7, further comprising: the fixing layer is arranged on one side, far away from the battery piece (10), of the electric connecting piece (20), and is at least partially connected with the battery piece (10) so as to fix the electric connecting piece (20) on the surface of the battery piece (10).
  9. 9. A method of manufacturing a photovoltaic module, the method comprising: providing a battery piece (10), wherein an electrode is arranged on the surface of the battery piece (10), and comprises a first slurry curing layer; providing an electrical connector (20), wherein the electrical connector (20) comprises a substrate (21), a bonding layer (22) coated on the surface of the substrate (21), and a second slurry curing layer (23) positioned on one side of the bonding layer (22); And stacking the electric connector (20) on the surface of the battery piece (10), and stacking the second slurry curing layer (23) on one side of the first slurry curing layer away from the battery piece (10).
  10. 10. The method of manufacturing a photovoltaic module according to claim 9, wherein the second slurry cured layer is formed by: And coating slurry on one surface of the bonding layer (22), and performing annealing treatment to form a second slurry curing layer (23), wherein the annealing temperature is T1, the annealing time is T, and the T1 is 150 ℃ or less and 250 ℃ or less and the T is 15min or less and 25min or less.
  11. 11. The method of manufacturing a photovoltaic module according to claim 9 or 10, further comprising: Laminating the stacked battery pieces (10) and the electrical connector (20), wherein the temperature in the lamination process is T2, and T2 is less than or equal to 120 ℃.

Description

Photovoltaic module and preparation method thereof Technical Field The application relates to the technical field of photovoltaic modules, in particular to a photovoltaic module and a preparation method of the photovoltaic module. Background The photovoltaic module can convert solar energy into electric energy for electric equipment to use or store in the storage battery. The battery piece is used as a core component of the photovoltaic module, and the variety of the battery piece is large. The low-temperature battery piece is used as one of the battery pieces, has the advantages of high photoelectric conversion efficiency and the like, and cannot bear higher processing temperature. In the related art, a fine grid extending in a first direction and a main grid extending in a second direction are provided on the surface of a low-temperature battery sheet, so that carriers generated by the battery sheet are collected through the fine grid, and the carriers collected by the fine grid are collected through the main grid. The welding strip extends along the second direction and is arranged on one side of the main grid far away from the battery piece. And a glue film is arranged on one side of the welding strip, which is far away from the battery piece, and the welding strip is fixed on the surface of the battery piece through the glue film, so that the welding strip is contacted with the main grid and is conducted, and carriers collected by the main grid are transmitted to an external circuit through the welding strip. However, in the related art, the melting point of the surface coating of the welding strip is higher, and tin and lead elements in the coating are difficult to fully diffuse and uniformly distribute under the low-temperature welding process, so that the electric connectivity between the welding strip and the electrode is poor, the contact resistance is increased, the photoelectric conversion efficiency of the photovoltaic module is affected, the mechanical strength between the welding strip and the electrode is insufficient, and the welding strip and the electrode are cracked and fail in the subsequent production, installation and operation of the photovoltaic module, so that the reliability of the photovoltaic module is reduced. Disclosure of Invention The application discloses a photovoltaic module and a preparation method of the photovoltaic module, which aim to solve or at least partially solve the problems of poor electrical connectivity of a welding strip and an electrode, influence on the photovoltaic conversion efficiency of the photovoltaic module and insufficient mechanical strength between the welding strip and the electrode in the prior art. In order to solve the technical problems, the application is realized as follows: The application discloses a photovoltaic module, which comprises a battery piece, an electric connecting piece and a second slurry curing layer, wherein an electrode is arranged on the surface of the battery piece, the electric connecting piece is electrically connected with the electrode, the electrode comprises a first slurry curing layer, the first slurry curing layer is at least positioned at the joint of the electrode and the electric connecting piece, the electric connecting piece comprises a substrate, a bonding layer and the second slurry curing layer, the bonding layer is coated on the surface of the substrate, and the second slurry curing layer is arranged on one side, close to the first slurry curing layer, of the bonding layer. In some embodiments, the first slurry cured layer is the same material as the second slurry cured layer, or the second slurry cured layer has a lower organic content than the first slurry cured layer. In some embodiments, the bonding layer comprises a layer of lead-tin alloy having an average width of the aggregate of lead atoms of less than or equal to 3 microns. In some embodiments, the electrode includes a collector grid line extending in a first direction, the first slurry cured layer is disposed at a junction of the collector grid line and the electrical connector, or the electrode includes a collector grid line extending in the first direction and a collector grid line extending in a second direction, the first slurry cured layer is disposed at a junction of the collector grid line and the electrical connector, and the second direction intersects the first direction. In some embodiments, the second paste solidified layer includes a plurality of second paste solidified sub-blocks intermittently distributed on the bonding layer along an extension direction of the electrical connection. In some embodiments, the width of the electrical connection is L1, the width of the second paste cured layer is L2, L2 is greater than or equal to 1/2L 1, and/or the width of the bus bar line is L3, L2 is greater than or equal to 2L 3, and/or L3 is greater than or equal to 100 μm, and L2 is greater than or equal to 200 μm. In some embodiments, the