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EP-4485549-B1 - PHOTOVOLTAIC MODULE

EP4485549B1EP 4485549 B1EP4485549 B1EP 4485549B1EP-4485549-B1

Inventors

  • ZHANG, CHUNFENG
  • XIE, YUNFEI
  • GUO, Zhiqiu
  • TAO, Wusong

Dates

Publication Date
20260506
Application Date
20230920

Claims (10)

  1. A photovoltaic module, comprising: a first cover plate (101), a first adhesive film (102), a cell string (103), a second adhesive film (104) and a second cover plate (105) sequentially stacked in the afore-recited order; wherein the cell string (103) has a front side and an opposing rear side, the front side having a light receiving surface, wherein the first cover plate (101) is disposed on the front side of the cell string and has a first surface (111) facing the light receiving surface of the cell string, the first surface including a central area and an edge area surrounding the central area; wherein the first adhesive film (102) includes a first sub-adhesive film (121) and a second sub-adhesive film (122), the first sub-adhesive film is located on at least part of the edge area of the first surface, the second sub-adhesive film is located on a surface of the first sub-adhesive film facing away from the first surface, and an orthographic projection of the second sub-adhesive film on the first surface at least covers the central area and part of the edge area of the first surface; wherein a material of a part of the first sub-adhesive film (121) facing away from the first surface (111) is the same as a material of a part of the second adhesive film (104) facing away from the second cover plate, plate (105), and a material of a part of the second sub-adhesive film (122) facing the cell string is Poly Olefin Elastomer (POE); wherein contact between an interface of the part of the first sub-adhesive film (121) facing away from the first surface and an interface of the part of the second adhesive film (104) facing away from the second cover plate (105) is achieved upon lamination; wherein the first surface is rectangular, and the edge area includes two opposite long edge areas and two opposite short edge areas, an area where one of the two opposite long edge areas and one of the two opposite short edge areas overlap forms a corner area, wherein the first sub-adhesive film covers at least one corner area in the edge area of the first surface; and characterised in that in an extension direction of long sides of the two opposite long edge areas, a width (w3) of an overlapping area of an orthographic projection of the first sub-adhesive film (121) on the first surface and the orthographic projection of the second sub-adhesive film (122) on the first surface is in a range of 5mm to 12 mm.
  2. The photovoltaic module according to claim 1, wherein the first sub-adhesive film (121) at least covers the two opposite short edge areas.
  3. The photovoltaic module according to claim 1 or claim 2, wherein a width of the first sub-adhesive film (121) is in a range of 10mm to 70mm in an extension direction of long sides of the two opposite long edge areas.
  4. The photovoltaic module according to any one of claims 1 to 3, wherein in an extension direction of long sides of the two opposite long edge areas, a distance between an edge of the orthographic projection of the second sub-adhesive film (122) on the first surface and an adjacent edge of the first surface is in a range of 10mm to 20 mm.
  5. The photovoltaic module according to any one of claims 1 to 4, wherein in an extension direction of long sides of the two opposite long edge areas, a distance between an edge of the cell string (103) and an adjacent edge of the second sub-adhesive film (122) is in a range of 10mm to 15mm.
  6. The photovoltaic module according to any one of claims 1 to 5, wherein a material of the part of the first sub-adhesive film (121) facing away from the first surface is one of EVA, PVB and POE.
  7. The photovoltaic module according to any one of claims 1 to 6, wherein the second adhesive film (104) includes a third sub-adhesive film (141) and a fourth sub-adhesive film (142) which are sequentially laminated, the second cover plate (105) is disposed on the rear side of the cell string (103) and has a second surface facing the cell string, the second surface includes a central area and an edge area surrounding the central area, the third sub-adhesive film (141) is located on at least part of the edge area of the second surface, the fourth sub-adhesive film (142) is located on the surface of the third sub-adhesive film facing away from the second surface, and an orthographic projection of the first sub-adhesive film (121) on the first cover plate and an orthographic projection of the third sub-adhesive film (141) on the first cover plate at least partially overlap, a material of the part of the third sub-adhesive film (141) facing away from the second surface is the same as a material of the part of the first sub-adhesive film (121) facing away from the first surface.
  8. The photovoltaic module according to any one of claims 1 to 7, wherein the first sub-adhesive film (121) includes a first adhesive film layer and a second adhesive film layer which are sequentially stacked, the first adhesive film layer faces the second adhesive film, and a material of the first adhesive film layer is the same as the material of the part of the second adhesive film facing the first adhesive film.
  9. The photovoltaic module according to any one of claims 1 to 8, wherein the second adhesive film (104) comprises a third adhesive film layer and a fourth adhesive film layer which are sequentially stacked, the third adhesive film layer faces the first adhesive film, and a material of the third adhesive film layer is the same as the material of the first sub-adhesive film (121) facing the second adhesive film.
  10. The photovoltaic module according to any one of claims 1 to 9, wherein the second sub-adhesive film (122) includes a POE adhesive film, a PE adhesive film including a part of POE facing the cell string or a PEP adhesive film.

Description

TECHNICAL FIELD The various embodiments described in this document relate in general to the technical field of solar cells, and in particular to a photovoltaic module. BACKGROUND Fossil energy may cause atmospheric pollution and has limited reserves, while solar energy has the advantage of clean, pollution-free, and abundant in resources. As a result, solar energy is gradually becoming a core clean energy alternative to fossil fuels. Due to the good photoelectric conversion efficiency, solar cells have become the development focus of clean energy utilization. A photovoltaic module includes a cell string, an encapsulation film and a cover plate. In the process of preparing a photovoltaic module, multiple solar cells are usually connected in turn to form a cell string with a specific output power, and an adhesive film layer and a cover plate are sequentially stacked on both sides of the cell string, and then the photovoltaic module is formed by lamination molding. However, an encapsulation film of current photovoltaic modules is prone to problems such as bubbles and even delamination during use, and the reliability of photovoltaic modules needs to be improved. CN210897310U discloses a photovoltaic assembly and a photovoltaic system, the photovoltaic assembly comprises a cover plate, a back plate and a photovoltaic cell, the cover plate and the back plate are oppositely arranged, the photovoltaic cell is packaged between the cover plate and the back plate by adopting a packaging adhesive film, and the packaging adhesive film comprises a front packaging layer and a back packaging layer. The front packaging layer or the back packaging layer comprises a POE layer covering one side of the photovoltaic cell and an edge EVA layer surrounding the peripheral edge of the POE layer. According to the utility model, the area between the edge of the back plate or the cover plate and the edge of the battery piece is packaged by the packaging material which is made of the same material as the other surface of the photovoltaic battery, so that the stability of the packaged double-sided assembly is ensured. JP2013125778A discloses a solar cell module which achieves high reliability. According to one embodiment, a solar cell module 1000, including a solar cell element 100, an acetic acid block sealing material 200, EVA sealing materials 300 and 320, and a protection material 400, is provided. The solar cell element 100 is a thin film silicon type solar cell element where a power generation region 120 is formed on a light receiving surface 8A that is one of surfaces of a substrate 8. The acetic acid block sealing material 200 is disposed so as to contact with the light receiving surface 8A where the solar cell element 100 is formed and covers the power generation region 120. The EVA sealing materials 300 and 320 sandwich the solar cell element 100 and the acetic acid block sealing material 200 from both surfaces. The protection material 400 is disposed on a surface of the EVA sealing material on the light receiving surface 8A side, i.e., the EVA sealing material 300. CN116200131A discloses a modified polyvinyl butyral adhesive film, a preparation method and a solar cell module. The modified polyvinyl butyral adhesive film comprises a polyvinyl butyral film layer and a grafted modified polyolefin thermoplastic elastomer film layer arranged on the surface of the polyvinyl butyral film layer; the graft modified polyolefin thermoplastic elastomer is prepared from the following raw materials in parts by weight: 90-110 parts of polyolefin thermoplastic elastomer; 0.05 to 1.0 part of a cross-linking agent; and 2.0 to 6.0 parts of maleic anhydride. The modified polyvinyl butyral adhesive film has the advantages of favorable transparency, favorable adhesive property and favorable weather resistance. All layers of the solar cell module are tightly bonded, the sealing performance is good, and the aging performance is good. SUMMARY A photovoltaic module is provided according to some embodiments of the present disclosure, which is at least beneficial to improving the performance and bonding strength of an edge area of an encapsulation film, reducing the probability of bubble generation or delamination of the encapsulation film, and improving the reliability of the photovoltaic module. The invention is set out in the appended sets of claims. A photovoltaic module is provided according to claim 1. The photovoltaic module includes a first cover plate, a first adhesive film, a cell string, a second adhesive film and a second cover plate which are sequentially stacked. The first cover plate is located over a light receiving surface of the cell string. The first adhesive film includes a first sub-adhesive film and a second sub-adhesive film which are sequentially stacked. The first cover plate has a first surface facing the cell string, and the first surface includes a central area and an edge area surrounding the central area. The first sub-adhes