CN-121985593-A - Photovoltaic module and photovoltaic system

Abstract

The invention discloses a photovoltaic module and a photovoltaic system, wherein the photovoltaic module comprises a laminated piece, the laminated piece comprises a bus piece, a second packaging adhesive film and a back plate, the second packaging adhesive film and the back plate are provided with lead-out holes, the bus piece comprises a bending part, the bending part penetrates through the lead-out holes, a water blocking structure is sleeved on the bending part penetrating through the same lead-out hole and comprises a first metal water blocking layer and two insulating layers which are arranged in a stacked mode, the first metal water blocking layer is positioned between the two insulating layers, a first through hole for the bending part to penetrate through is formed in the first metal water blocking layer, a second through hole for the bending part to penetrate through is formed in the two insulating layers, a distance D1 is formed between the bending part and the inner wall of the first through hole in the same direction, and a distance D2 and D1> D2 are formed between the bending part and the inner wall of the second through hole. In the embodiment of the invention, the water blocking effect at the position of the leading-out hole can be improved through the arrangement of the first water blocking structure.

Inventors

• GAO YUN
• ZHANG JING
• CHEN WEIQIANG
• YANG DONGSHENG
• HU GUOBO

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

20251219

Claims (20)

1. 1. The photovoltaic module is characterized by comprising a laminated piece, wherein the laminated piece comprises a laminated cover plate, a first packaging adhesive film, a battery layer, a second packaging adhesive film and a back plate, wherein the second packaging adhesive film and the back plate are provided with lead-out holes, and the bus piece of the battery layer comprises a bending part which penetrates through the lead-out holes; The bending part penetrating through the same extraction hole is sleeved with a first water blocking structure, the first water blocking structure comprises a first metal water blocking layer and two insulating layers which are arranged in a stacked mode, and the first metal water blocking layer is positioned between the two insulating layers; A first through hole for the bending part to pass through is formed in the first metal waterproof layer, and a second through hole for the bending part to pass through is formed in each of the two insulating layers; In the same direction, a distance D1 is formed between the bending part and the inner wall of the first through hole, and a distance D2 is formed between the bending part and the inner wall of the second through hole, wherein D1 is larger than D2.
2. 2. The photovoltaic module according to claim 1, wherein a distance D1 between the bent portion and an inner wall of the first through hole is 0.5mm to 8mm, and/or, The number of the first through holes is 1, and the number of the second through holes is equal to the number of the bending parts.
3. 3. The photovoltaic module of claim 1, wherein a portion of the insulating layer fills between the bend and an inner wall of the first via; Or the part of the second packaging adhesive film is filled between the bending part and the inner wall of the first through hole.
4. 4. The photovoltaic module of claim 1, wherein an inner wall of at least one of the second through holes abuts the bent portion.
5. 5. The photovoltaic module according to claim 1, wherein the plurality of bent portions penetrate through the same extraction hole, a first region of at least one layer of the insulating layer is located between adjacent bent portions, and the first metal water-blocking layer is only surrounded by the plurality of bent portions; And/or, the first metal water-blocking layer is not arranged between the adjacent bending parts.
6. 6. The photovoltaic module of claim 5, wherein the first regions of the two insulating layers are each located between adjacent ones of the folds, and wherein a gap is provided at least in part between the first regions of the two insulating layers.
7. 7. The photovoltaic assembly of claim 1, wherein the bus bar further comprises a straight portion connected to the bent portion; The second packaging adhesive film covering the straight part and a monolithic insulating layer are arranged between the first metal waterproof layer and the straight part.
8. 8. The photovoltaic module according to claim 1, wherein at least one of the insulating layers is provided with only one second through hole, and the plurality of bent portions penetrate through the same second through hole.
9. 9. The photovoltaic module of claim 8, wherein, in a thickness direction of the photovoltaic module, orthographic projections of the second through holes are all located within orthographic projections of the first through holes; And/or the first through hole and the second through hole are both round through holes, and the diameter of the second through hole is smaller than that of the first through hole, or the first through hole and the second through hole are both rectangular through holes, and the area of the second through hole is smaller than that of the first through hole.
10. 10. The photovoltaic module according to claim 1, wherein the second through holes formed in at least one of the insulating layers are in one-to-one correspondence with the bending portions, the second through holes are bar-shaped through holes, and each second through hole is provided for the corresponding bending portion to pass through; and the orthographic projections of the second through holes are all positioned in the orthographic projections of the first through holes along the thickness direction of the photovoltaic module.
11. 11. The photovoltaic module of claim 1, wherein in an orthographic projection of the first water blocking structure along a thickness direction of the photovoltaic module, an outer contour of the first metal water blocking layer is located within an outer contour of the insulating layer.
12. 12. The photovoltaic module according to claim 11, wherein the outer side of the first metal water blocking layer has a portion of an insulating layer in a horizontal direction; Or in the horizontal direction, the distance between the outer contour of the first metal water-resistant layer and the outer contour of the insulating layer is 0.5mm-10mm.
13. 13. The photovoltaic module of claim 1, wherein the first metallic water-resistant layer is bonded to the insulating layer.
14. 14. The photovoltaic module of claim 1, wherein the bus bar further comprises a straight portion connected to the bent portion by a rounded corner, Along the thickness direction of the photovoltaic module, the straight part is provided with a first part close to the round angle and a second part far away from the round angle than the first part, the distance between the first part and the cover plate is D3, and the distance between the second part and the cover plate is D4, wherein D3< D4.
15. 15. The photovoltaic module of claim 1, wherein at least one surface of the insulating layer has an undulating structure.
16. 16. The photovoltaic module of claim 1, wherein the first metal water-resistant layer has a moisture vapor transmission rate of 0.1 g/(m2·day) or less; and/or the water vapor transmittance of the insulating layer is greater than the water vapor transmittance of the first metal water-resistant layer and less than or equal to 0.5 g/(m2.day).
17. 17. The photovoltaic module according to claim 1, wherein the insulating layer is made of at least one of butyl rubber and acrylic acid, and wherein one of the insulating layers is bonded to the back sheet; And/or the material of the first metal water-resistant layer comprises at least one of aluminum foil and copper foil; And/or the thickness of the insulating layer is 10 μm to 20 μm; And/or the thickness of the first metal water-resistant layer is 10-20 μm.
18. 18. The photovoltaic module of any of claims 1-17, further comprising a junction box, wherein the bend extends beyond the laminate to electrically connect with the junction box; A portion of the first water blocking structure arches toward the junction box.
19. 19. The photovoltaic module of any of claims 1-17, wherein a first exit hole on the backsheet has a first orthographic projection, a first through hole has a second orthographic projection, and a plurality of second through holes on the insulating layer have a third orthographic projection along a thickness direction of the photovoltaic module; the area of the first orthographic projection is smaller than or equal to that of the second orthographic projection, and the third orthographic projection is in the range of the first orthographic projection.
20. 20. The photovoltaic module of any of claims 1-17, wherein the laminate further comprises a cell, the orthographic projection of the first water blocking structure not overlapping the orthographic projection of the cell in the thickness direction of the photovoltaic module; or a gap is formed between the orthographic projection of the first metal water-blocking layer and the orthographic projection of the battery piece along the thickness direction of the photovoltaic module.

Description

Photovoltaic module and photovoltaic system Technical Field The invention relates to the technical field of photovoltaics, in particular to a photovoltaic module and a photovoltaic system. Background The photovoltaic module comprises a bus bar, a back adhesive film, a back plate or back glass, wherein an extraction hole is formed in the back plate or back glass, the bus bar is extracted from the extraction hole and is connected with a junction box, and sealing silica gel is filled and sealed in the junction box and at the position of the extraction hole so as to prevent water vapor from penetrating. In addition, micro shrinkage generated in the curing process of the silica gel can form capillary channels at the interface, the water molecules can easily permeate into the assembly through the capillary channels, and the elastic modulus of the silica gel can be attenuated and the interface bonding strength is reduced along with long-term use, so that the water blocking performance of the position of a leading-out hole of the assembly can be weakened. Disclosure of Invention The invention provides a photovoltaic module and a photovoltaic system, and aims to improve water blocking performance of a module leading-out hole part. The embodiment of the invention provides a photovoltaic module, which comprises a laminated piece, wherein the laminated piece comprises a bus piece and a back plate, the second packaging adhesive film and the back plate are provided with lead-out holes, the bus piece comprises a bending part, and the bending part penetrates through the lead-out holes; The bending part penetrating through the same extraction hole is sleeved with a first water blocking structure, the first water blocking structure comprises a first metal water blocking layer and two insulating layers which are arranged in a stacked mode, and the first metal water blocking layer is positioned between the two insulating layers; A first through hole for the bending part to pass through is formed in the first metal waterproof layer, and a second through hole for the bending part to pass through is formed in each of the two insulating layers; In the same direction, a distance D1 is formed between the bending part and the inner wall of the first through hole, and a distance D2 is formed between the bending part and the inner wall of the second through hole, wherein D1 is larger than D2. In the embodiment of the invention, the metal structure is compact, the water blocking performance is good, and the water blocking structure comprises the first metal water blocking layer, so that the water vapor can be effectively prevented from penetrating into the assembly from the extraction hole, the water blocking effect at the extraction hole is improved, the water vapor permeation rate at the extraction hole is reduced, and the long-term operation reliability of the assembly is further improved. Simultaneously, the insulating layer is arranged between the first metal water-resisting layer and the backboard, so that the first metal water-resisting layer can be prevented from being contacted with the hard backboard, and scratches and hidden cracks are reduced. The distance D1 is arranged between the bending part and the inner wall of the first through hole at the outer side of the bending part, D1 is larger than D2, namely the inner wall of the first through hole is relatively farther away from the bending part, and the distance between the first metal water-resisting layer and the bending part is larger than that between the first metal water-resisting layer and the insulating layer. In practical application, when the bending part passes through the first through hole and the second through hole, because the insulating layer is closer to the bending part, and the insulating layer, the first metal water-resisting layer and the position of the bending part are relatively fixed after lamination, no matter the bending part is fixed or sways, the bending part is always in contact with the outer side of the bending part and is the insulating layer, but not the first metal water-resisting layer farther away, so that the short circuit and electric leakage of the bending part can be avoided, and the electric risk is reduced. Through the two-layer insulating layer that stacks the setting with first metal water-blocking layer, the first metal water-blocking layer of upper and lower both sides interval and the portion of bending can be followed to the insulating layer of two-layer, and the effectual insulation that plays first metal water-blocking layer and the portion of bending guarantees insulating properties to reduce electrical risk. The foregoing description is only an overview of the present invention, and is intended to provide a better understanding of the technical means of the present invention, as it is embodied in the present specification, and is intended to provide a better understanding of the above and other objects, features and advan