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CN-122028517-A - Insulation structure applied to photovoltaic module, photovoltaic module and preparation method

CN122028517ACN 122028517 ACN122028517 ACN 122028517ACN-122028517-A

Abstract

The invention discloses an insulation structure applied to a photovoltaic module, the photovoltaic module and a preparation method. The insulation structure comprises an insulation cementing layer which is adhesive on two sides and comprises a first part and a second part, and an additional insulation layer arranged on one side of at least one part of the second part of the insulation cementing layer, wherein one part of the first part can be folded over the additional insulation layer so that the additional insulation layer is positioned between the second part and the folded first part. The reliability of the first conductive piece can be improved, and the short circuit risk of the photovoltaic module is reduced.

Inventors

  • HUANG CHENG
  • DOU HUI
  • WU LANFENG

Assignees

  • 晶澳（扬州）太阳能科技有限公司

Dates

Publication Date
20260512
Application Date
20260206

Claims (11)

  1. 1. An insulation structure applied to a photovoltaic module, comprising: an insulating cement layer (10) having tackiness on both sides and comprising a first portion (11) and a second portion (13); An additional insulating layer (20) arranged on one side of at least a portion of the second portion (13) of the insulating cement layer (10); Wherein a portion of the first portion (11) is foldable over the additional insulating layer (20) such that the additional insulating layer (20) is located between the second portion (13) and the folded first portion (11).
  2. 2. The insulating structure of claim 1, wherein, The first part (11) is provided with a crease region (12), and the crease region (12) extends along the length direction of the insulating cement layer (10) and corresponds to a crease from a part of the first part (11) to the additional insulating layer (20).
  3. 3. Insulation structure according to claim 1 or 2, characterized in that the additional insulation layer (20) comprises an intermediate insulation layer (21) and a fixation layer (22) arranged in a stack, the intermediate insulation layer (21) being fixedly connected to the fixation layer (22); the intermediate insulating layer (21) is located between the insulating cement layer (10) and the fixing layer (22).
  4. 4. The insulating structure of claim 3, wherein, The fixing layer (22) comprises thermoplastic material, preferably the fixing layer (22) comprises thermoplastic material consistent with the material used for the encapsulation layer of the photovoltaic module; And/or the number of the groups of groups, The thickness of the insulating cementation layer (10) is 50-60 mu m; And/or the number of the groups of groups, The thickness of the intermediate insulating layer (21) is 80-100 mu m; And/or the number of the groups of groups, The thickness of the fixing layer (22) is 120-180 mu m.
  5. 5. The insulating structure of any one of claims 1,2 and 4, In the length direction of the first part (11), the crease region (12) is provided with a through groove; Or alternatively In the length direction of the first part (11), the crease region (12) is provided with grooves which are spaced apart.
  6. 6. A photovoltaic module is characterized by comprising a cover plate (50), an upper packaging adhesive film (71), a battery array, a lower packaging adhesive film (72) and a back plate (60) which are sequentially layered, wherein the battery array comprises a plurality of battery strings (30), an electric isolation structure (20') and a bus bar (40), The battery string (30) comprises an edge battery piece (31) and a plurality of first conductive pieces (32) arranged on the edge battery piece (31), wherein a part of the first conductive pieces (32) are folded to the back edge area of the edge battery piece (31); -said electrical isolation structure (20 ") is formed by an insulating structure according to any one of claims 1-5 by folding a portion of said first portion (11) over said additional insulating layer (20) and between a plurality of said first conductive elements (32) folded over and an edge region of said edge cell (31), wherein said second portion (13) is bonded to said edge cell (31) on the side facing away from said additional insulating layer (20), and said first portion (11) folded over is bonded to said plurality of first conductive elements (32) folded over on the side facing away from said additional insulating layer (20); The bus bar (40) is located on one side, far away from the first folded part (11), of the first folded conductive pieces (32), and the bus bar (40) is connected with the first folded conductive pieces (32) and is adhered to the first folded part (11).
  7. 7. The photovoltaic module according to claim 6, characterized in that in the electrical isolation structure (20 "): the edges of the additional insulating layer (20) adjacent to the creased region (12) of the first portion (11) are aligned with the edges of the edge cells (31).
  8. 8. The photovoltaic module of claim 6, wherein the photovoltaic module comprises, The additional insulating layer (20) is attached to the folded first part (11); Or alternatively An intermediate packaging adhesive film (73) is arranged between the additional insulating layer (20) and the folded first part (11).
  9. 9. The photovoltaic module of claim 6, wherein the photovoltaic module comprises, The battery string (30) further includes a second conductive member (33) provided on the edge battery piece (31), the second conductive member (33) being opposite in conductivity type to the first conductive member (32), Wherein the second conductive member (33) extends at least partially beyond the edge cell (31), and the second conductive member (33) extends beyond the edge cell (31) a distance less than the distance of the creased region (12) of the electrical isolation structure (20 ") from the edge of the edge cell (31).
  10. 10. A method of manufacturing a photovoltaic module, comprising: step 1, sequentially layering and paving a cover plate (50), an upper packaging adhesive film (71) and a plurality of battery strings (30); Step 2, placing a bus bar (40) under a plurality of first conductive members (32) extending out of an edge battery (31) of the battery string (30), and placing the insulating structure according to any one of claims 1 to 5 on a back edge region of the edge battery (31) of the battery string (30), wherein a side of the second portion (13) away from the additional insulating layer (20) is bonded to the back edge region of the edge battery (31), an edge of the additional insulating layer (20) near the crease region (12) is aligned with an edge of the edge battery (31), the first portion (11) covers over the plurality of first conductive members (31) extending out of the edge battery, and the plurality of first conductive members (31) extending out of the edge battery and the bus bar (40) are bonded; Step 3, folding the first part (11) along a crease region (12) arranged on the first part and bonding the first part with the additional insulating layer (20), driving a plurality of first conductive pieces (31) and the bus strips (40) to be folded above the additional insulating layer (20), and welding the first conductive pieces (31) and the bus strips (40); and 4, sequentially layering and paving a lower packaging adhesive film (72) and a back plate (60), and laminating.
  11. 11. The method of manufacturing a photovoltaic module according to claim 10, characterized in that it further comprises, between step 2 and step 3, laying an intermediate packaging film (73), wherein said intermediate packaging film (73) covers at least said additional insulating layer (20) and said intermediate packaging film does not cover the first portion (11) of said insulating cement layer (10).

Description

Insulation structure applied to photovoltaic module, photovoltaic module and preparation method Technical Field The invention relates to an insulation structure applied to a photovoltaic module, the photovoltaic module and a preparation method. Background In order to improve the effective power generation area of the photovoltaic module, a bus bar of the photovoltaic module is arranged on the back surface of an edge battery piece of the battery string, an insulating gasket is arranged between the bus bar and the back surface of the edge battery piece, and a positive electrode welding bar (positive electrode welding wire) or a negative electrode welding bar (negative electrode welding wire) extending out of the edge battery piece is folded, and the folded positive electrode welding bar (positive electrode welding wire) or negative electrode welding bar (negative electrode welding wire) is welded with the bus bar. Because the welding strip width is smaller, the density is big, the material is softer, and especially, the welding wire width is narrower, the density is bigger, the material is softer, leads to anodal welding strip (anodal welding wire) or negative pole welding strip (negative pole welding wire) to take place deformation and contact very easily in folding process, has higher overlap joint risk with the welding strip (welding wire) of opposite polarity, causes photovoltaic module short circuit risk higher. In addition, in the lamination process of the photovoltaic module, the bus bar is easy to shift, the lap joint risk of welding bars (welding wires) with opposite polarities is increased, and the short circuit risk of the photovoltaic module is further increased. Disclosure of Invention In view of the above, the present invention provides an insulation structure applied to a photovoltaic module, a photovoltaic module and a manufacturing method thereof, wherein the insulation structure is helpful to better stabilize a plurality of first conductive members and a bus bar in the process of folding the plurality of first conductive members and the bus bar extending out of the edge battery piece of the battery string, so as to reduce the risk of overlap short circuit between conductive members of opposite polarity, and avoid the problem that the plurality of first conductive members extending out of the edge battery piece are bent, deformed and laterally standing. Specifically, the invention provides the following technical scheme: In a first aspect, the present invention provides an insulation structure applied to a photovoltaic module, comprising: An insulating cement layer having tackiness on both sides and comprising a first portion and a second portion; An additional insulating layer disposed on one side of at least a portion of the second portion of the insulating cement layer; Wherein a portion of the first portion may be folded over the additional insulating layer such that the additional insulating layer is located between the second portion and the folded over first portion. Optionally, the first portion is provided with a crease region extending along a length direction of the insulating cement layer and corresponding to a crease of a portion of the first portion turned over to the additional insulating layer. Optionally, the additional insulating layer comprises an intermediate insulating layer and a fixed layer which are stacked, wherein the intermediate insulating layer is fixedly connected with the fixed layer; The intermediate insulating layer is located between the insulating cement layer and the fixing layer. Optionally, the fixing layer comprises a thermoplastic material, preferably the fixing layer comprises a thermoplastic material that is consistent with the material used for the encapsulation layer of the photovoltaic module. Optionally, the thickness of the insulating cement layer is 50-60 μm. Optionally, the thickness of the intermediate insulating layer is 80-100 μm. Optionally, the thickness of the fixing layer is 120-180 μm. Optionally, in the length direction of the first part, the crease region is provided with a through groove; Optionally, in the length direction of the first portion, the crease region is provided with spaced grooves. In a second aspect, an embodiment of the present invention provides a photovoltaic module, the photovoltaic module including a cover plate, an upper packaging film, a battery array, a lower packaging film, and a back plate sequentially layered, the battery array including a plurality of battery strings, an electrical isolation structure, and a bus bar, wherein, The battery string comprises an edge battery piece and a plurality of first conductive pieces arranged on the edge battery piece, and part of the first conductive pieces are folded to the back edge area of the edge battery piece; The electrical isolation structure is formed by folding a portion of the first portion over the additional insulating layer and between the folded plurality o