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EP-4739037-A1 - METHOD FOR MANUFACTURING CELL STRING, METHOD FOR MANUFACTURING PHOTOVOLTAIC MODULE, AND PHOTOVOLTAIC MODULE

EP4739037A1EP 4739037 A1EP4739037 A1EP 4739037A1EP-4739037-A1

Abstract

A method for manufacturing a cell string, a method for manufacturing a photovoltaic module are provided. The method includes: providing a plurality of slicing cell sheets to be stacked, the plurality of slicing cell sheets include a first slicing cell sheet and a second slicing cell sheet, at least one surface of the first slicing cell sheet includes a stacking area to be stacked with the second slicing cell sheet, and a first buffer adhesive film is laid in the stacking area; laying first welding strips on the surface of the first slicing cell sheet, the first welding strip passing through the stacking area and covering a part of the first buffer adhesive film; partially stacking the second slicing cell sheet with the first slicing cell sheet; performing welding such that the second slicing cell sheet is electrically interconnected with the first slicing cell sheet via the first welding strips.

Inventors

  • TAO, Wusong
  • WANG, Luchuang
  • WANG, XIN
  • LI, CHUNQIANG
  • HAN, Xiangchao

Assignees

  • JINKO SOLAR CO., LTD
  • Jinko Solar (Haining) Co., Ltd.

Dates

Publication Date
20260506
Application Date
20251029

Claims (15)

  1. A method for manufacturing a cell string, comprising: providing a plurality of slicing cell sheets (101) to be stacked, wherein the plurality of slicing cell sheets (101) include a first slicing cell sheet (1011) and a second slicing cell sheet (1012), at least one surface of the first slicing cell sheet (1011) has a stacking area (30) to be stacked with the second slicing cell sheet (1012), and a first buffer adhesive film (102) is laid in the stacking area (30); laying first welding strips (103) on the at least one surface of the first slicing cell sheet (1011), with the first welding strips (103) passing through the stacking area (30) and covering a part of the first buffer adhesive film (102); partially stacking the second slicing cell sheet (1012) with the first slicing cell sheet (1011); and performing welding such that the second slicing cell sheet (1012) is electrically interconnected with the first slicing cell sheet (1011) via the first welding strips (103).
  2. The manufacturing method according to claim 1, wherein in an arrangement direction of the plurality of slicing cell sheets (101) in the cell string (40), the first buffer adhesive film (102) has a width greater than or equal to a width of the stacking area (30).
  3. The manufacturing method according to any one of claims 1 to 2, wherein in an arrangement direction of the plurality of slicing cell sheets (101) in the cell string (40), the first buffer adhesive film (102) protrudes from an end portion of the first slicing cell sheet (1011).
  4. The manufacturing method according to any one of claims 1 to 3, wherein in an arrangement direction of the plurality of slicing cell sheets (101) in the cell string (40), the first buffer adhesive film (102) has a width ranging from 3 mm to 10 mm; and in a direction perpendicular to the arrangement direction of the plurality of slicing cell sheets (101), the first buffer adhesive film (102) has a length ranging from 6 mm to 13 mm.
  5. The manufacturing method according to any one of claims 1 to 4, further including: before laying the first welding strips (103) on the surface of the first slicing cell sheet (1011), performing a heat fixing treatment on the first buffer adhesive film (102), wherein the heat fixing treatment includes heating the first buffer adhesive film (102) to bond the first buffer adhesive film (102) on the surface of the first slicing cell sheet (1011); optionally, wherein process parameters of the heat fixing treatment include: a heating temperature ranging from 60°C to 70°C and a heating time period ranging from 0.5 s to 1.5 s.
  6. The manufacturing method according to any one of claims 1 to 5, wherein the welding includes laser welding, and the laser welding includes: controlling a laser to irradiate a surface of the first welding strips (103) to weld the first welding strips (103) to surfaces of the slicing cell sheets.
  7. The manufacturing method according to any one of claims 1 to 6, the method further includes: providing a plurality of solder joints (301) on the slicing cell sheets, wherein the first welding strips (103) are in contact with the plurality of solder joints (301), and in an arrangement direction of the slicing cell sheets (101) in the cell string (40), a width of the first buffer adhesive film (102) is less than a distance between the two nearest solder joints (301) of the first and second slicing cell sheets (1012).
  8. The manufacturing method according to any one of claims 1 to 7, wherein a respective first welding strip of the first welding strips (103) includes a main portion (1031) and a connecting portion (1032) connecting the main portion (1031), wherein the main portion (1031) has a thickness greater than a thickness of the connecting portion; the laying of the first welding strips (103) on the at least one surface of the first slicing cell sheet (1011) includes: positioning the connecting portion (1032) to be directly aligned with the first buffer adhesive film (102); optionally, wherein a sum of the thickness of the connecting portion (1032) and a thickness of the first buffer adhesive film (102) is equal to the thickness of the main portion (1031).
  9. The manufacturing method according to any one of claims 1 to 8, wherein the first buffer adhesive film (102) may be made from a pre-crosslinked adhesive film such as Ethylene Vinyl Acetate Copolymer (EVA), Polyolefin Elastomer (POE), or a co-extruded material of EVA-POE-EVA (EPE); optionally, wherein the first buffer adhesive film (102) is made from an Ethylene Vinyl Acetate Copolymer (EVA) material with a crosslinking degree of 5% to 70%, a Polyolefin Elastomer (POE) material with a crosslinking degree of 5% to 70%, or an EVA-POE-EVA (EPE) material with a crosslinking degree of 5% to 70%.
  10. The manufacturing method according to any one of claims 1 to 9, wherein a respective slicing cell sheet of the plurality of slicing cell sheets (101) is a 3-segmented to a 12-segmented cell obtained by cutting an original whole cell sheet into 3 to 12 segments.
  11. The manufacturing method according to any one of claims 1 to 9, wherein a width of a respective of the plurality of slicing cell sheets (101) ranges from 40 to 86 mm, a length of a respective of the plurality of slicing cell sheets ranges from 180 to 260 mm.
  12. The manufacturing method according to any one of claims 1 to 9, wherein the laying of the first buffer adhesive film (102) includes: providing an initial buffer adhesive film; cutting the initial buffer adhesive film to form the first buffer adhesive film (102); and moving the first buffer adhesive film (102) to the stacking area (30).
  13. The manufacturing method according to any one of claims 1 to 9, wherein the first slicing cell sheet (1011) includes a first surface (10) and a second surface (20) opposite to the first surface (10), the laying of the first buffer adhesive film (102) comprises: laying the first buffer adhesive film (102) in the stacking area (30) corresponding to the first surface (10) and the second surface (20).
  14. The manufacturing method according to any one of claims 1 to 9, wherein the first slicing cell sheet (1011) is formed by: providing an initial cell sheet; cutting the initial cell sheet to form at least three cell slices; and laying the first buffer adhesive film (102) in the stacking area (30) of a respective cell slice of the at least three cell slices to form the first slicing cell sheet (1011); or, providing an initial cell sheet; laying the first buffer adhesive film (102) in the stacking area (30) of the initial cell sheet corresponding to each slicing cell sheet; and cutting the initial cell sheet with the first buffer adhesive film (102) laid thereon to form at least three first slicing cell sheets (1011).
  15. A method for manufacturing a photovoltaic module, comprising: providing a plurality of cell strings, wherein a respective cell string of the plurality of cell strings is the cell string (40) manufactured by the method according to any one of claims 1 to 14; laying second buffer adhesive films (104) on surfaces of the slicing cell sheets (101) at both sides of the respective cell string, the second buffer adhesive films (104) being located at end portions of the slicing cell sheets (101); providing second welding strips (105), the second welding strips (105) being electrically connected to the slicing cell sheets (101) at both sides of the respective cell string and covering surfaces of the second buffer adhesive films (104); providing busbars (106), the busbars (106) being electrically connected to the second welding strips (105) and electrically connected to the plurality of cell strings (40) via the second welding strips (105); forming at least one encapsulating adhesive film (41), the at least one encapsulating adhesive film (41) being configured to cover surfaces of the plurality of cell strings (40); and forming a cover plate (42), the cover plate (42) being configured to cover a surface of the at least one encapsulating adhesive film (41) facing away from the plurality of cell strings (40).

Description

TECHNICAL FIELD Embodiments of the present disclosure relate to the photovoltaic field, and in particular to a method for manufacturing a cell string, a method for manufacturing a photovoltaic module, and a photovoltaic module. BACKGROUND Cell string is a structure that connects multiple cell sheets in series to produce more power, preventing situations where a single cell cannot meet the desired voltage and current. Stacked cell strings, as a type of cell strings, are formed by slicing cell sheets and interconnecting front surface edges of preceding slicing cell sheets with back surface edges of subsequent slicing cell sheets. Such a design allows the cell slices to be connected to each other in a more compact manner, and reduces gaps between the cell sheets, which can increase the power of the cell string per unit area, thereby being widely used. However, for the stacked cell strings, there is a problem that overlapping parts of the stacked cell strings are prone to damage. SUMMARY Embodiments of the present disclosure provide a method for manufacturing a cell string, a method for manufacturing a photovoltaic module, and a photovoltaic module. According to some embodiments of the present disclosure, a method for manufacturing a cell string is provided. The method includes: providing a plurality of slicing cell sheets to be stacked, where the plurality of slicing cell sheets include a first slicing cell sheet and a second slicing cell sheet, at least one surface of the first slicing cell sheet has a stacking area to be stacked with the second slicing cell sheet, and a first buffer adhesive film is laid in the stacking area; laying first welding strips on the at least one surface of the first slicing cell sheet, with the first welding strips passing through the stacking area and covering a part of the first buffer adhesive film; partially stacking the second slicing cell sheet with the first slicing cell sheet; and performing welding such that the second slicing cell sheet is electrically interconnected with the first slicing cell sheet via the first welding strips. In some embodiments, in an arrangement direction of the plurality of slicing cell sheets in the cell string, the first buffer adhesive film has a width greater than or equal to a width of the stacking area. In some embodiments, in an arrangement direction of the plurality of slicing cell sheets in the cell string, the first buffer adhesive film protrudes from an end portion of the first slicing sheet. In some embodiments, in an arrangement direction of the plurality of slicing cell sheets in the cell string, the first buffer adhesive film has a width ranging from 3 mm to 10 mm; and in a direction perpendicular to the arrangement direction of the plurality of slicing cell sheets, the first buffer adhesive film has a length ranging from 6 mm to 13 mm. In some embodiments, the method further including: before laying the first welding strips on the surface of the first slicing cell sheet, performing a heat fixing treatment on the first buffer adhesive film, where the heat fixing treatment includes heating the first buffer adhesive film to bond the first buffer adhesive film on the surface of the first slicing cell sheet. In some embodiments, process parameters of the heat fixing treatment include: a heating temperature ranging from 60°C to 70°C and a heating time period ranging from 0.5 s to 1.5 s. In some embodiments, the welding includes laser welding, and the laser welding includes: controlling a laser to irradiate a surface of the first welding strips to weld the first welding strips to surfaces of the slicing cell sheets. In some embodiments, the method further includes providing a plurality of solder joints on the slicing cell sheets, the first welding strips are in contact with the plurality of solder joints, and in an arrangement direction of the slicing cell sheets in the cell string, a width of the first buffer adhesive film is less than a distance between the two nearest solder joints of the first and second slicing cell sheets. In some embodiments, a respective first welding strip of the first welding strips includes a main portion and a connecting portion connecting the main portions, where the main portion has a thickness greater than a thickness of the connecting portion; the laying of the first welding strips on the at least one surface of the first slicing cell sheet includes: positioning the connecting portion to be directly aligned with the first buffer adhesive film. In some embodiments, a sum of the thickness of the connecting portion and a thickness of the first buffer adhesive film is equal to the thickness of the main portion. In some embodiments, the first buffer adhesive film may be made from a pre-crosslinked adhesive film such as Ethylene Vinyl Acetate Copolymer (EVA), Polyolefin Elastomer (POE), or a co-extruded material of EVA-POE-EVA (EPE). In some embodiments, the first buffer adhesive film is made from an Ethylene Vi