A photovoltaic module having an insulating edge seal

Abstract

The utility model provides a photovoltaic module with insulating edge sealing structure, and the photovoltaic module is the plate body structure with four side walls which is composed of first glass plate, first adhesive film, cell piece, second adhesive film and second glass plate arranged in sequence, four insulating adhesive tapes are bonded on the four side walls one by one, and the photovoltaic module with the insulating adhesive tape is bonded and fixed with the first glass plate and the cell piece through laminating processing, and the second adhesive film is bonded and fixed with the second glass plate and the cell piece through laminating processing. The through hole formed on the insulating adhesive tape meets the normal exhaust requirement of the photovoltaic module during laminating, and the through hole for exhaust during laminating is closed by melting the insulating adhesive tape after laminating, so that the creepage distance of the photovoltaic module is not shortened to the straight line distance of the through hole, and the effect that the creepage distance length of the photovoltaic module is not affected while meeting the exhaust is achieved.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic module technology, specifically to a photovoltaic module with an insulating edge-sealing structure. Background Technology

[0002] In the photovoltaic module manufacturing process, after the front glass, encapsulating film, solar cells, encapsulating film, and back glass are stacked in sequence, the top and bottom glass pieces need to be fixed in place with edge sealing tape before lamination. The edge sealing tape covering the sides of the module serves two purposes: firstly, it seals the edges of the module to prevent moisture and contaminants from penetrating the module and causing backsheet delamination and encapsulating film decomposition; secondly, it prevents conductive components (such as busbars and metal frames) from being directly exposed, ensuring that the creepage distance and electrical clearance between high-voltage parts (such as junction box terminals) and the frame meet safety standards.

[0003] Because air inevitably gets trapped between the layers during the sequential laying of the front glass, encapsulant film, solar cells, encapsulant film, and back glass before lamination, and the decomposition or volatilization of additives in the encapsulant film during lamination also releases a small amount of gas, this gas is squeezed out from between the layers during lamination. Therefore, the edge sealing tape covering the sides of the photovoltaic module before lamination will affect the normal discharge of this gas. While making holes in the edge sealing tape can help discharge this gas, the perforated tape will shorten the creepage distance of the photovoltaic module from along the surface of the edge sealing tape to the straight distance between the perforations, resulting in a shortened creepage distance and creating a safety hazard. Therefore, how to ensure that the edge sealing tape can both expel gas during lamination and maintain a safe creepage distance is a pressing problem to be solved in current photovoltaic module manufacturing. Utility Model Content

[0004] In order to solve the technical problems existing in the background art, this utility model proposes a photovoltaic module with an insulating edge-sealing structure.

[0005] This utility model proposes a photovoltaic module with an insulating edge-sealing structure. Specifically, the photovoltaic module is a plate structure with four side walls, consisting of a first glass plate, a first adhesive film, a solar cell, a second adhesive film, and a second glass plate arranged sequentially. Four pieces of insulating tape are correspondingly and adhesively bonded to the four side walls. The photovoltaic module with the insulating tape is laminated to bond and fix the first glass plate and the solar cell with the first adhesive film, and to bond and fix the second glass plate and the solar cell with the second adhesive film through lamination.

[0006] Preferably, the insulating tape has multiple through holes evenly arranged on it during the lamination process of the photovoltaic module.

[0007] Preferably, the plurality of through holes are closed by processing after the photovoltaic module lamination process is completed.

[0008] Preferably, the insulating tape includes a tape layer and an adhesive layer. The tape layer is made of a hot-melt material. The multiple through holes are closed after the photovoltaic module lamination process is completed. Specifically, all through holes are closed by hot-melting the tape layer.

[0009] Preferably, the seams between adjacent strips are fused simultaneously during the hot-melt treatment of the strip layers.

[0010] Preferably, the through hole is a puncture hole, and the puncture direction is from the adhesive layer to the strip layer.

[0011] Preferably, the insulating tape extends in reverse to form a first extension strip and a second extension strip, the first extension strip being bonded to the first glass plate and the second extension strip being bonded to the second glass plate.

[0012] Preferably, multiple first extension strips are joined together on the first glass plate to form a uniform first annular strip, and multiple second extension strips are joined together on the second glass plate to form a uniform second annular strip.

[0013] Preferably, the seams left when multiple first extension strips are joined together to form a first annular strip are simultaneously heat-fused together during the heat-melting treatment of the strip layer; the seams left when multiple second extension strips are joined together to form a second annular strip are simultaneously heat-fused together during the heat-melting treatment of the strip layer.

[0014] In this invention, through holes are provided on the insulating tape to meet the normal venting requirements of the photovoltaic module during lamination. The insulating tape, made of hot-melt material, can also close the through holes used for venting during lamination by heating and melting the insulating tape after lamination. This avoids the existence of through holes causing a shortening of the creepage distance of the photovoltaic module. Thus, the insulating tape in this invention can meet the venting requirements while ensuring that the creepage distance is not affected, thereby meeting the lamination processing requirements of the photovoltaic module. Attached Figure Description

[0015] Figure 1 This is a cross-sectional schematic diagram of a photovoltaic module with an insulated edge-sealing structure proposed in this utility model;

[0016] Figure 2 This is a schematic diagram showing the unfolded state of the insulating tape of the photovoltaic module with an insulating edge-sealing structure proposed in this utility model.

[0017] Figure 3 This is a schematic diagram of the puncture formation of through holes in the insulating tape of a photovoltaic module with an insulating edge-sealing structure proposed in this utility model.

[0018] Figure 4 This is a schematic diagram of the four first extension strips of the photovoltaic module with an insulating edge-sealing structure proposed in this utility model being assembled into a first annular strip. Detailed Implementation

[0019] Reference Figure 1-4 This utility model proposes a photovoltaic module with an insulated edge-sealing structure. Specifically, the photovoltaic module is a plate structure with four sidewalls, consisting of a first glass plate 101, a first encapsulating film 102, a solar cell 103, a second encapsulating film 104, and a second glass plate 105 arranged sequentially. Before lamination, the first glass plate 101, the first encapsulating film 102, the solar cell 103, the second encapsulating film 104, and the second glass plate 105 are arranged as follows... Figure 1 The photovoltaic modules are stacked together in the order shown. Then, four pieces of insulating tape 2 are attached to the side walls of the four photovoltaic modules one by one. The attached insulating tape 2 can seal the side of the photovoltaic modules to prevent moisture and impurities from entering. At the same time, the attached insulating tape 2 can also force the current to be conducted along the surface path of the insulating tape 2, thereby extending the creepage distance.

[0020] To further extend the creepage distance, such as Figure 2 , Figure 3 and Figure 4 As shown: the insulating tape 2 extends in reverse to form a first extension strip 401 and a second extension strip 402. The first extension strip is bonded to the first glass plate 101, and the second extension strip is bonded to the second glass plate 105. Furthermore, multiple first extension strips 401 are joined together on the first glass plate 101 to form a uniform first annular strip, and multiple second extension strips 402 are joined together on the second glass plate 105 to form a uniform second annular strip. The first extension strips 401 and 402 extending from the insulating tape 2 change the current conduction path from along the surface of the insulating tape 2 to: along the surfaces of the insulating tape 2 and the first extension strip 401, and along the surfaces of the insulating tape 2 and the second extension strip 402. The width of the first extension strip 401 and the second extension strip 402 is the length by which the creepage distance is further extended. Therefore, the first extension strip 401 and the second extension strip 402 provided in this embodiment can not only be used to bond and reinforce the first glass plate 101 and the second glass plate 105, but also further extend the creepage distance, enhancing the safety of the photovoltaic module.

[0021] It is worth noting that: Figure 1As shown, the insulating tape 2 includes a tape layer 201 and an adhesive layer 202. The tape layer 201 is made of a hot-melt material. It is known that the temperature range during lamination is 140℃-150℃. Therefore, the melting point of the hot-melt material selected in this embodiment must be higher than 150℃ to prevent the insulating tape 2 from melting during lamination. Furthermore, the selected hot-melt material must also have good electrical insulation properties. Accordingly, the hot-melt materials that can be selected include, but are not limited to, the following: polyethylene terephthalate (PET), polybutylene terephthalate (PBT), fluorinated ethylene propylene copolymer (FEP), and polypropylene (PP). These hot-melt materials all have good electrical insulation properties, and the melting points of PET and PBT are 250℃-260℃, FEP is 260℃, and PP is 160℃-170℃, all of which meet the melting point requirements of the hot-melt material in this embodiment. In actual production, the choice of which material to use depends on a comprehensive consideration of factors such as the heating temperature range of the hot-melt equipment available to the actual photovoltaic module manufacturer and the production cost of the photovoltaic module (different hot-melt materials have different prices). This embodiment does not make any further limitations here.

[0022] After the insulating tape 2 is bonded, the photovoltaic module with the insulating tape 2 bonded together can be laminated so that the first adhesive film 102 bonds and fixes the first glass plate 101 and the solar cell 103, and the second adhesive film 104 bonds and fixes the second glass plate 105 and the solar cell 103, thereby tightly bonding the multi-layer materials to form a sealed, stable and durable power generation unit.

[0023] In order to expel the gas between the layers during the above-mentioned lamination process, multiple through holes 3 are evenly arranged on the insulating tape 2 before the insulating tape is pasted. This allows the gas squeezed out from between the layers during the lamination process, as well as the gas released from the first adhesive film 102 and the second adhesive film 104 due to the decomposition and volatilization of the additives therein, to be discharged through the through holes 3, thus achieving the effect of normal exhaust.

[0024] Furthermore, because the presence of through-hole 3 shortens the creepage distance to the straight-line distance between the perforations, in order to ensure both venting and that the creepage distance of the photovoltaic module remains unaffected, the multiple through-holes 3 provided in this embodiment can be closed after processing following the lamination of the photovoltaic module. Specifically: Figure 3 As shown, the through hole 3 is set as a puncture hole, and the puncture direction is from the adhesive layer 202 to the strip layer 201. This puncture direction design will form an outward protruding flash 2011 on the side of the strip layer 201 away from the adhesive layer 202. After lamination, the strip layer 201 is heat-melted using a heating and melting technology, so that the flash 2011 can be melted and fused with the hot melt material of the inner wall of the through hole 3 into a whole, so as to achieve the effect of closing the through hole 3, thereby avoiding the problem of shortened creepage distance caused by the presence of the through hole 3.

[0025] In addition, since insulating tape 2 is bonded to all four sidewalls of the photovoltaic module, there will inevitably be a seam between each two adjacent insulating tapes 2. Seams will also be left when multiple first extension tapes 401 and multiple second extension tapes 402 are spliced ​​together. Therefore, in order to avoid the existence of seams affecting the sealing performance and creepage distance, the seams between adjacent tape layers 201 can be fused together simultaneously when the tape layers 201 are heat-melted. The seams left when multiple first extension tapes 401 are spliced ​​together to form the first annular tape and the seams left when multiple second extension tapes 402 are spliced ​​together to form the second annular tape can also be heat-melted simultaneously. This allows the insulating tape 2 and the first extension tapes 401 and second extension tapes 402 to be fused into a whole. This not only improves the sealing effect on the sides of the photovoltaic module, but also allows the current to be conducted along the insulating tape 2, the first extension tapes 401, and the second extension tapes 402, effectively extending the creepage distance and thus meeting the processing requirements of the photovoltaic module.

[0026] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A photovoltaic module with an insulated edge-sealing structure, characterized in that, The photovoltaic module is specifically a plate structure with four sidewalls, consisting of a first glass plate (101), a first encapsulant film (102), a solar cell (103), a second encapsulant film (104), and a second glass plate (105) arranged in sequence. Four pieces of insulating tape (2) are correspondingly and adhesively bonded to the four sidewalls. The photovoltaic module with the insulating tape (2) is laminated to bond and fix the first glass plate (101) and the solar cell (103) with the first encapsulant film (102), and to bond and fix the second glass plate (105) and the solar cell (103) with the second encapsulant film (104) with the second glass plate (105) and the solar cell (103) with the second encapsulant film (104).

2. A photovoltaic module with an insulated edge-sealing structure according to claim 1, characterized in that, Multiple through holes (3) are evenly arranged on the insulating tape (2) during the photovoltaic module lamination process.

3. A photovoltaic module with an insulated edge-sealing structure according to claim 2, characterized in that, The multiple through holes (3) are closed after the photovoltaic module lamination process is completed.

4. A photovoltaic module with an insulated edge-sealing structure according to claim 3, characterized in that, The insulating tape (2) includes a tape layer (201) and an adhesive layer (202). The tape layer (201) is made of hot melt material. The multiple through holes (3) are closed after the photovoltaic module lamination process is completed. Specifically, all through holes (3) are closed by hot melting the tape layer (201).

5. A photovoltaic module with an insulated edge-sealing structure according to claim 4, characterized in that, During the hot-melting process of the strip (201), the seams between adjacent strips (201) are simultaneously fused together.

6. A photovoltaic module with an insulated edge-sealing structure according to claim 4, characterized in that, The through hole (3) is a puncture hole, and the puncture direction is from the adhesive layer (202) to the strip layer (201).

7. A photovoltaic module with an insulated edge-sealing structure according to claim 4, characterized in that, The insulating tape (2) extends in reverse to form a first extension tape (401) and a second extension tape (402). The first extension tape (401) is bonded to the first glass plate (101), and the second extension tape (402) is bonded to the second glass plate (105).

8. A photovoltaic module with an insulated edge-sealing structure according to claim 7, characterized in that, Multiple first extension strips (401) are joined together on the first glass plate (101) to form a uniform first annular strip, and multiple second extension strips (402) are joined together on the second glass plate (105) to form a uniform second annular strip.

9. A photovoltaic module with an insulated edge-sealing structure according to claim 8, characterized in that, When multiple first extension strips (401) are joined together to form a first annular strip, the seams left are simultaneously heat-fused together when the strip layer (201) is heat-fused; when multiple second extension strips (402) are joined together to form a second annular strip, the seams left are simultaneously heat-fused together when the strip layer (201) is heat-fused.

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