High voltage photovoltaic modules

Abstract

A high-voltage photovoltaic module relates to the field of photovoltaic technology. The structure of the high-voltage photovoltaic module includes a backplane, a first packaging material, a solar cell, a second packaging material, and a front glass in sequence; or, the structure of the high-voltage photovoltaic module includes a backplane, a first packaging material, a solar cell, a first packaging material, and a front glass in sequence. In this way, by designing a high-voltage photovoltaic module including the first packaging material, the anti-puncture capability of the photovoltaic module when used in high-altitude areas can be improved. The two different interlayer structure designs of the high-voltage photovoltaic module can meet different production needs, further reduce the thickness of the module, and reduce production costs.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaics, and more specifically, to a high-voltage photovoltaic component. Background Art

[0002] Based on climate and environmental protection requirements and the country's support for new energy, solar photovoltaic power generation has become the main way of generating electricity in the field of new energy power generation. The use of photovoltaic modules can effectively convert solar energy that cannot be collected into electrical energy. The structural design of photovoltaic modules with a current voltage level of 1500V and the film packaging used can only pass the conventional test standards of 20KV and below pulse voltage. With the development of science and technology, the application of photovoltaic modules is becoming more and more extensive, and high-altitude areas are gradually using photovoltaic modules to achieve solar power generation in high-altitude areas. Combined with the current International Electrotechnical Commission (IEC) Rhine and South German certification standards, the development of 2000V high-voltage photovoltaic modules needs to pass the 30KV pulse voltage standard test. Ordinary photovoltaic modules with a voltage level of 1500V cannot withstand the breakdown voltage capability of atmospheric overvoltage above 20Kv (24kv, or even 30Kv) in high-altitude areas. Ordinary photovoltaic modules with a voltage level of 1500V have low insulation performance and weak voltage breakdown resistance when used in high-altitude areas, especially when overvoltage is 24kv, they are prone to breakdown or flash explosion on the surface.

[0003] Therefore, how to design a photovoltaic module that can be used in high-altitude areas has become one of the technical problems that need to be solved urgently at this stage. Utility Model Content

[0004] In view of this, the utility model provides a high-voltage photovoltaic module, which increases the breakdown voltage of the high-voltage photovoltaic module film by changing the packaging material, so as to improve the anti-breakdown capability of the photovoltaic module in high-altitude areas.

[0005] In a first aspect, the present application provides a high-voltage photovoltaic module, wherein the structure of the high-voltage photovoltaic module includes, from bottom to top, a back sheet, a first packaging material, a solar cell, a second packaging material, and a front glass; or, the structure of the high-voltage photovoltaic module includes, from bottom to top, a back sheet, a first packaging material, a solar cell, a first packaging material, and a front glass;

[0006] The first packaging material comprises a PET layer, and a single EVA layer is coated on both the upper and lower surfaces of the PET layer, wherein a coating layer exists between the PET layer and the EVA layer; the structure of the first packaging material from top to bottom is EVA layer, coating layer, PET layer, coating layer, and EVA layer in sequence;

[0007] The second packaging material is a polyolefin elastomer material.

[0008] Optionally, the thickness of the first packaging material is 330 μm-900 μm.

[0009] Optionally, the thickness of the PET layer in the first packaging material is 65 μm-160 μm.

[0010] Optionally, the EVA layers located on the upper and lower sides of the PET layer have the same thickness.

[0011] Optionally, the thickness of the EVA layer in the first packaging material is 70 μm-430 μm.

[0012] Optionally, the coating material is one of fluorine-containing polyurethane, fluorine-containing acrylic or silicone.

[0013] Optionally, the coating has a thickness of 10±5 μm.

[0014] Optionally, the high voltage photovoltaic module is an N-type photovoltaic module.

[0015] Optionally, the creepage distance of the long side of the backboard in the high-voltage photovoltaic module is a+4mm, and the creepage distance of the short side of the backboard in the high-voltage photovoltaic module is b+4mm, where a is the creepage distance of the long side of the backboard in the photovoltaic module below 1500V, and b is the creepage distance of the short side of the backboard in the photovoltaic module below 1500V.

[0016] Optionally, the creepage distance of the long side of the front glass in the high-voltage photovoltaic module is c+4mm, and the creepage distance of the short side of the front glass in the high-voltage photovoltaic module is d+4mm, where c is the creepage distance of the long side of the front glass in the photovoltaic module below 1500V, and d is the creepage distance of the short side of the front glass in the photovoltaic module below 1500V.

[0017] Compared with the prior art, the high voltage photovoltaic module provided by the utility model achieves at least the following beneficial effects:

[0018] 1. By designing a high-voltage photovoltaic module containing the first packaging material, the anti-puncture capability of the high-voltage photovoltaic module when used in high-altitude areas can be improved; by designing two different interlayer structures of the high-voltage photovoltaic module, the thickness of the module can be further reduced on the basis of improving the anti-puncture capability of the high-voltage photovoltaic module in high-altitude areas, thereby reducing the production cost;

[0019] 2. By setting the thickness range of the first packaging material, the anti-puncture capability in high altitude areas is further improved by layer thickness control;

[0020] 3. Increase the creepage distance between the back panel and the front glass in high-voltage photovoltaic modules so that they can be connected to a 2000V junction box to meet actual application needs.

[0021] Of course, any product implementing the present utility model does not necessarily need to achieve all of the above-mentioned technical effects at the same time.

[0022] Other features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present invention and, together with the description, serve to explain the principles of the present invention.

[0024] Figure 1 The figure shows a schematic diagram of the interlayer structure of a high voltage photovoltaic module structure provided in an embodiment of the present application;

[0025] Figure 2 Shown is a schematic diagram of another interlayer structure of a high voltage photovoltaic module structure provided in an embodiment of the present application;

[0026] Figure 3 The figure shows a schematic diagram of the interlayer structure of a first packaging material in a high voltage photovoltaic module provided in an embodiment of the present application;

[0027] Figure 4 The figure shows a schematic diagram of the creepage distance between the back plate and the front glass of a high-voltage photovoltaic module provided in an embodiment of the present application;

[0028] Figure 5 The figure shows the creepage distance between the back panel and the front glass of photovoltaic modules below 1500V. DETAILED DESCRIPTION

[0029] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention.

[0030] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0031] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0032] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0033] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0034] The utility model provides a high-voltage photovoltaic component, which is used for improving the anti-breakdown capability of the photovoltaic component in high-altitude areas.

[0035] The following is a detailed description with reference to the accompanying drawings and specific embodiments.

[0036] Figure 1 The figure shows a schematic diagram of the interlayer structure of a high voltage photovoltaic module structure provided in an embodiment of the present application. Figure 2 FIG. 1 is a schematic diagram of another interlayer structure of a high voltage photovoltaic module provided in an embodiment of the present application. Figure 3 FIG. 1 is a schematic diagram of the interlayer structure of a first packaging material in a high voltage photovoltaic module provided in an embodiment of the present application. Please refer to FIG. Figures 1 to 3 , the present application provides a high-voltage photovoltaic module 10, the structure of the high-voltage photovoltaic module 10 includes, from bottom to top: a back sheet 03, a first packaging material 01, a solar cell 00, a second packaging material 02, and a front glass 04; or, the structure of the high-voltage photovoltaic module 10 includes, from bottom to top: a back sheet 03, a first packaging material 01, a solar cell 00, a first packaging material 01, and a front glass 04;

[0037] The first packaging material 01 includes a PET layer 05, and the upper and lower surfaces of the PET layer 05 are coated with a single layer of EVA layer 06, wherein a coating layer 07 is present between the PET layer 05 and the EVA layer 06; the structure of the first packaging material 01 from top to bottom is EVA layer 06, coating layer 07, PET layer 05, coating layer 07, and EVA layer 06;

[0038] The second packaging material 02 is a polyolefin elastomer material.

[0039] Specifically, a high-voltage photovoltaic module 10 provided in the present application includes two structures, one of which is: along the direction of the back plate 03 of the high-voltage photovoltaic module 10 pointing to the front glass 04, the structure of the high-voltage photovoltaic module 10 includes the back plate 03, the first packaging material 01, the solar cell 00, the second packaging material 02, and the front glass 04 in sequence, that is, the first packaging material 01 is located between the back plate 03 and the solar cell 00, the second packaging material 02 is located on the side of the solar cell 00 away from the first packaging material 01, and the second packaging material 02 is located between the solar cell 00 and the front glass 04; wherein the first packaging material 01 is a composite structure, the first packaging material 01 includes a PET (Polyethylene terephthalate) layer 05, and the front of the PET layer 05 is coated with a single layer of EVA (Ethylene-vinyl AcetateCopolymer, ethylene-vinyl acetate copolymer) layer 06, a coating layer 07 exists between the PET layer 05 and the front single-layer EVA layer 06; the back of the PET layer 05 is coated with a single-layer EVA layer 06, and a coating layer 07 exists between the PET layer 05 and the back single-layer EVA, that is, the structure of the first packaging material 01 from top to bottom is EVA layer 06, coating 07, PET layer 05, coating 07, EVA layer 06; the second packaging material 02 is a polyolefin elastomer material (Polyolefin elastomer, referred to as POE), that is to say, the structure of the high-voltage photovoltaic module 10 along the direction from the back plate 03 of the high-voltage photovoltaic module 10 to the front glass 04 is back plate 03, EVA layer 06, coating 07, PET layer 05, coating 07, EVA layer 06, solar cell 00, POE polyolefin elastomer material, front glass 04;

[0040] Along the direction from the back plate 03 of the high voltage photovoltaic module 10 to the front glass 04, another structure of the high voltage photovoltaic module 10 is: back plate 03, first packaging material 01, solar cell 00, first packaging material 01, front glass 04; that is, a layer of first packaging material 01 is located between the back plate 03 and the solar cell 00, and a layer of first packaging material 01 is located between the solar cell 00 and the front glass 04, that is, the front and back sides of the solar cell 00 are both pasted with the first packaging material 01, the side of the first packaging material 01 on the front side of the solar cell 00 that is not in contact with the solar cell 00 is also covered with the front glass 04, and the side of the first packaging material 01 on the back side of the solar cell 00 that is not in contact with the solar cell 00 is also covered with the back plate 03; wherein, the first packaging material 01 is a composite structure, and the first packaging material 01 includes a PET (Polyethylene terephthalate) layer 05, and the front side of the PET layer 05 is coated with a single layer of EVA (Ethylene-vinyl Acetate Copolymer, ethylene-vinyl acetate copolymer) layer 06, a coating layer 07 exists between the PET layer 05 and the front single-layer EVA layer 06; the back of the PET layer 05 is coated with a single-layer EVA layer 06, and a coating layer 07 exists between the PET layer 05 and the back single-layer EVA layer 06, that is, the structure of the first packaging material 01 from top to bottom is EVA layer 06, coating layer 07, PET layer 05, coating layer 07, EVA layer 06; that is, the structure of the high-voltage photovoltaic module 10 along the direction from the back panel 03 of the high-voltage photovoltaic module 10 to the front glass 04 is Back panel 03, EVA layer 06, coating 07, PET layer 05, coating 07, EVA layer 06, solar cell 00, EVA layer 06, coating 07, PET layer 05, coating 07, EVA layer 06, front glass 04; In this way, by designing a high-voltage photovoltaic module 10 including the first packaging material 01, the anti-puncture capability of the high-voltage photovoltaic module 10 when used in high-altitude areas can be improved. Through two different structural designs, on the basis of improving the anti-puncture capability of the high-voltage photovoltaic module 10 in high-altitude areas, the thickness of the module can be further reduced to reduce the production cost.

[0041] Please continue to refer to Figures 1 to 3 In a high voltage photovoltaic module 10 provided in an embodiment of the present application, the thickness of the first packaging material 01 is 330 μm-900 μm.

[0042] Specifically, the thickness of the first packaging material 01 in the high voltage photovoltaic module 10 is in the range of 330 μm-900 μm, that is, the total thickness of the five-layer structure of the first packaging material 01, including the PET layer 05, the EVA layer 06 on both sides of the PET layer 05, the coating layer 07 between the PET layer 05 and the EVA layer 06 on one side, and the coating layer 07 between the PET layer 05 and the EVA layer 06 on the other side, is in the range of 330 μm-900 μm. The thickness of the encapsulation layer can range from 330μm to 600μm, 400μm to 800μm, 350μm to 750μm, 350μm to 550μm, 390μm to 560μm, 400μm to 570μm, 450μm to 580μm, 480μm to 600μm, 500μm to 650μm, 550μm to 700μm, 600μm to 750μm, 650μm to 800μm, 700μm to 850μm, 750μm-900μm, etc., further, the thickness of the first packaging layer can be 340μm, 380μm, 420μm, 460μm, 500μm, 540μm, 580μm, 620μm, 660μm, 700μm, 740μm, 780μm, 820μm, 860μm, 900μm, etc., which are not listed here one by one, and it is only necessary to satisfy that the thickness range of the first packaging material 01 is within the range of 330μm-900μm, such as Therefore, by setting the thickness range of the first packaging material 01, each of the five-layer structure, namely, the PET layer 05 in the first packaging material 01, the EVA layer 06 on both sides of the PET layer 05, the coating 07 between the PET layer 05 and the EVA layer 06 on one side, and the coating 07 between the PET layer 05 and the EVA layer 06 on the other side, has a certain thickness, and the anti-puncture capability in high altitude areas is further improved by controlling the layer thickness in the structural setting of the high-voltage photovoltaic module 10.

[0043] Please refer to Figures 1 to 3 In a high voltage photovoltaic module 10 provided in an embodiment of the present application, the thickness of the PET layer 05 in the first packaging material 01 is 65 μm-160 μm.

[0044] Specifically, the first packaging material 01 includes a PET layer 05, an EVA layer 06 located on both sides of the PET layer 05, a coating layer 07 located between the PET layer 05 and the EVA layer 06 on one side, and a coating layer 07 located between the PET layer 05 and the EVA layer 06 on the other side, wherein the thickness of the PET layer 05 in the first packaging material 01 ranges from 65 μm to 160 μm; further, the thickness of the PET layer 05 in the first packaging layer can range from 100 μm to 200 μm. For 65μm-100μm, 70μm-120μm, 80μm-140μm, 65μm-110μm, 70μm-115μm, 75μm-120μm, 80μm-125 μm, 85μm-130μm, 90μm-135μm, 95μm-140μm, 100μm-145μm, 105μm-150μm, 110μm-155μm, 115μm m-160μm, etc., and further, the thickness of the PET layer 05 in the first packaging layer can be 65μm, 70μm, 75μm, 80μm, 85μm, 90μm, 95μm, 100μm, 105μm, 110μm, 115μm, 120μm, 125μm, 130μm, 135μm, 140μm, 145μm, 150μm, 155μm, 160μm, etc., which are not listed one by one here, and it is only necessary to satisfy that the thickness range of the PET layer 05 in the first packaging material 01 is within the interval range of 65μm-160μm. In this way, by setting the thickness range of the PET layer 05 in the first packaging material 01, the PET layer 05 in the first packaging material 01 can be controlled to a certain thickness, and on the basis of the material characteristics of the PET layer 05, the anti-puncture capability of the high-voltage photovoltaic module 10 in high altitude areas is further improved by layer thickness control.

[0045] It should be noted that PET material has good transparency, gloss, good air tightness, excellent mechanical properties, its toughness is the best among all thermoplastics, and its tensile strength and impact strength are much higher than ordinary films; PET material also has excellent heat resistance, cold resistance and good chemical resistance and oil resistance, and can be widely used in plastics, hardware, display panels, polarizers, pulse dampers, brightening films, external diffusers, photovoltaics and other industries.

[0046] Please continue to refer to Figures 1 to 3 In a high voltage photovoltaic module 10 provided in an embodiment of the present application, the thickness of the EVA layers 06 located on the upper and lower sides of the PET layer 05 is the same.

[0047] Specifically, the first packaging material 01 includes a PET layer 05, an EVA layer 06 located on both sides of the PET layer 05, a coating layer 07 located between the PET layer 05 and the EVA layer 06 on one side, and a coating layer 07 located between the PET layer 05 and the EVA layer 06 on the other side, wherein the thickness of the EVA layer 06 located on one side of the PET layer 05 is the same as the thickness of the EVA layer 06 located on the other side of the PET layer 05, that is, the EVA layers 06 located on both sides of the PET layer 05 have the same thickness, and EVA is an ethylene-vinyl acetate copolymer material. EVA is composed of Vinyl acetate monomer is introduced into the molecular chain, thereby reducing the high crystallinity and improving toughness and impact resistance. The light weight, wear resistance and good waterproofness of the EVA material itself enable it to be evenly coated on both sides of the PET layer 05 with the same thickness, which can further improve the waterproofness and impact resistance of the first packaging material 01. In this way, the uniformity, waterproofness and impact resistance of the first packaging material 01 can be improved by setting the thickness of the EVA layer 06 on both sides of the PET layer 05 to be the same, which can further improve the anti-puncture capability of the high-voltage photovoltaic module 10 in high-altitude areas.

[0048] Please continue to refer to Figures 1 to 3 In a high voltage photovoltaic module 10 provided in an embodiment of the present application, the thickness of the EVA layer 06 in the first packaging material 01 is 70 μm-430 μm.

[0049] Specifically, the first packaging material 01 includes a PET layer 05, an EVA layer 06 located on both sides of the PET layer 05, a coating layer 07 located between the PET layer 05 and the EVA layer 06 on one side, and a coating layer 07 located between the PET layer 05 and the EVA layer 06 on the other side, wherein the thickness of the EVA layer 06 in the first packaging material 01 ranges from 70 μm to 430 μm, and the thickness of the EVA layer 06 located on one side of the PET layer 05 is the same as the thickness of the EVA layer 06 located on the other side of the PET layer 05. The same, that is, the EVA layers 06 located on both sides of the PET layer 05 have the same thickness; further, the thickness range of the EVA layers 06 located on both sides of the PET layer 05 in the first encapsulation layer can be 80μm-400μm, 90μm-420μm, 100μm-430μm, 75μm-250μm, 80μm-260μm, 85μm-270μm, 90μm-280μm, 95μm-290μm, 100μm-300μm, 105μm-310μm, 110μm-320μm, 115μm-330μm, 120μm-340μm, 125μm-350μm, etc. Further, the thickness of the EVA layer 06 located on both sides of the PET layer 05 in the first encapsulation layer can be 70μm, 100μm, 130μm, 160μm, 190μm, 210μm, 240μm, 270μm, 300μm, 330μm, 360μm, 390μm, 420μm etc., which are not listed one by one here. It is only necessary to satisfy that the thickness range of the EVA layer 06 in the first packaging material 01 is within the interval range of 70μm-430μm. In this way, the thickness of the EVA layer 06 on both sides of the PET layer 05 in the first packaging material 01 is set to be equal and within the thickness range of 70μm-430μm. On the basis of improving the uniformity of the first packaging material 01, the thickness range of the EVA layer 06 can be further controlled to improve the anti-puncture capability of the high-voltage photovoltaic module 10 in high-altitude areas.

[0050] Please continue to refer to Figures 1 to 3 In a high voltage photovoltaic module 10 provided in an embodiment of the present application, the coating 07 material is one of fluorine-containing polyurethane, fluorine-containing acrylic acid or silicone.

[0051] Specifically, the first packaging material 01 includes a PET layer 05, an EVA layer 06 located on both sides of the PET layer 05, a coating 07 located between the PET layer 05 and the EVA layer 06 on one side, and a coating 07 located between the PET layer 05 and the EVA layer 06 on the other side, wherein the coating 07 is used to improve the adhesion between the PET layer 05 and the EVA, wherein the coating 07 material may be one of fluorinated polyurethane, fluorinated acrylic, and silicone, that is, the coating 07 material may be one of fluorinated polyurethane, fluorinated acrylic, and silicone, that is, the coating 07 between the PET layer 05 and the EVA layer 06 on one side and the coating 07 between the EVA layer 06 on the other side may be the same or different in material, as long as the material used for the coating 07 can improve the adhesion between the PET layer 05 and the EVA layer 06. In this way, through the multiple optional materials of the coating 07, the material composition diversity of the first packaging material 01 can be enriched while satisfying the adhesion strength between the PET layer 05 and the EVA layer 06.

[0052] Please continue to refer to Figures 1 to 3 In a high voltage photovoltaic module 10 provided in an embodiment of the present application, the thickness of the coating 07 is 10±5 μm.

[0053] Specifically, the first packaging material 01 includes a PET layer 05, an EVA layer 06 located on both sides of the PET layer 05, a coating 07 located between the PET layer 05 and the EVA layer 06 on one side, and a coating 07 located between the PET layer 05 and the EVA layer 06 on the other side, wherein the thickness range of the coating 07 in the first packaging material 01 is 10±5μm. In an optional embodiment provided in the present application, the thickness range of the coating 07 in the first packaging material 01 is 10±2μm; in another optional embodiment provided in the present application, the thickness range of the coating 07 in the first packaging material 01 is 10±3μm; in yet another optional embodiment provided in the present application, the thickness range of the coating 07 in the first packaging material 01 is 10±4μm; further The thickness of the coating 07 can be 5μm, 6μm, 7μm, 8μm, 9μm, 10μm, 11μm, 12μm, 13μm, 14μm, 15μm, etc. When the thickness of the coating 07 in the first packaging material 01 is less than 5μm, the coating 07 is too thin and cannot protect the PET layer 05 in the first packaging material 01. When the thickness of the coating 07 in the first packaging material 01 is greater than 15μm, the coating 07 is too thick, which affects the internal uniformity and flatness of the coating 07. In this way, by controlling the thickness of the coating 07 in the first packaging material 01 within a certain range, the uniformity and flatness of the coating 07 can be maintained on the basis of protecting the PET layer 05 from damage, thereby improving the adhesion to the EVA layer 06.

[0054] Please continue to refer to Figures 1 to 3, an embodiment of the present application provides a high voltage photovoltaic module 10, and the high voltage photovoltaic module 10 is an N-type photovoltaic module.

[0055] In some examples, the solar cell provided in the embodiments of the present application can be any type of solar cell currently available, including but not limited to crystalline silicon cells, perovskite cells, dye-sensitized solar cells, quantum dot-sensitized solar cells, organic solar cells, stacked solar cells, etc., wherein crystalline silicon cells include but are not limited to PERC cells (Passivated Emitter and Rear Cell, referred to as emitter and back passivation cells), TopCon cells (Tunnel Oxide Passivating Contacts, referred to as tunnel oxide passivating contact cells), HJT cells (Hetero Junction with Intrinsic Thin-film, referred to as intrinsic thin film heterojunction cells), IBC cells (Interdigitated Back Contact, referred to as interdigitated back contact cells), etc., which are only used as examples here and are not specifically limited. Solar cells can be divided into P-type cells and N-type cells according to the different substrate silicon wafers. A photovoltaic module assembled from P-type cells is called a P-type photovoltaic module, and a photovoltaic module assembled from N-type cells is called an N-type photovoltaic module. According to different preparation processes, N-type cells have the advantages of high conversion efficiency, low temperature coefficient, high bifaciality and high carrier lifetime compared with P-type cells. The temperature difference between day and night in high-altitude areas is large, and the temperature changes are obvious. The smaller the temperature coefficient of the battery, the smaller the degree of change of the internal resistance of the battery with temperature, and the better the stability of the battery with temperature changes. As mentioned above, the temperature coefficient of the N-type battery is lower than that of the P-type battery, and the stability of the N-type battery with temperature changes is better than that of the P-type battery with temperature changes. Therefore, the high-voltage photovoltaic module 10 used in high-altitude areas uses an N-type photovoltaic module assembled from N-type cells. In this way, selecting an N-type photovoltaic module as the high-voltage photovoltaic module 10 can reduce the amplitude of the change in the internal resistance of the photovoltaic module caused by temperature changes, reduce the loss of the photovoltaic module in the photoelectric conversion process in high-altitude areas, and improve the stability of photoelectric conversion in high-altitude areas.

[0056] Figure 4 The figure shows a schematic diagram of the creepage distance between the back plate and the front glass of a high voltage photovoltaic module provided in an embodiment of the present application. Figure 5 The figure shows the creepage distance between the back panel and the front glass of photovoltaic modules below 1500V. Please refer to Figures 1 to 5A high voltage photovoltaic module 10 is provided in an embodiment of the present application. The high voltage photovoltaic module 10 includes battery strings 11 arranged in an array and a bus bar 12 located between two adjacent rows of battery strings 11. A photovoltaic module 10' below 1500V includes battery strings 11' arranged in an array and a bus bar 12' located between two adjacent rows of battery strings 11'. The creepage distance of the long side L1 of the backboard 03 in the high voltage photovoltaic module 10 is a+4mm, and the creepage distance of the short side L2 of the backboard 03 in the high voltage photovoltaic module 10 is b+4mm, wherein a is the creepage distance of the long side L1' of the backboard 03' in the photovoltaic module 10' below 1500V, and b is the creepage distance of the short side L2' of the backboard 03' in the photovoltaic module 10' below 1500V.

[0057] Specifically, in a high-voltage photovoltaic module 10 used in high-altitude areas provided in an embodiment of the present application, the voltage level of the high-voltage photovoltaic module 10 is 2000V. Compared with a 1500V photovoltaic module, the high-voltage photovoltaic module 10 needs to be connected to a 2000V junction box, and the corresponding creepage distance of the back panel 03 in the high-voltage photovoltaic module 10 should also be increased. When the creepage distance of the long side L1' of the back panel 03' in the photovoltaic module 10' below 1500V is a, and the creepage distance of the short side L2' of the back panel 03' is b, the creepage distance of the long side L1 of the back panel 03 in the high-voltage photovoltaic module 10 is a+4mm, and the creepage distance of the short side L2 of the back panel 03 in the high-voltage photovoltaic module 10 is b. +4mm, that is, the creepage distance of the long side L1 of the backsheet 03 of the high-voltage photovoltaic module 10 is increased by 4mm relative to the creepage distance of the long side L1' of the backsheet 03' of the photovoltaic module 10' below 1500V, and the creepage distance of the short side L2 of the backsheet 03 of the high-voltage photovoltaic module 10 is increased by 4mm relative to the creepage distance of the short side L2' of the backsheet 03' of the photovoltaic module 10' below 1500V. In this way, by increasing the creepage distance of the long side L1 of the backsheet 03 and the creepage distance of the short side L2 of the backsheet 03 in the high-voltage photovoltaic module 10, the need for the high-voltage photovoltaic module 10 to connect to a 2000V junction box can be met, so that the high-voltage photovoltaic module 10 can pass the 30KV pulse voltage test.

[0058] Please continue to refer to Figures 1 to 5 In an embodiment of the present application, a high voltage photovoltaic module 10 is provided, in which the creepage distance of the long side L1 of the front glass 04 in the high voltage photovoltaic module 10 is c+4mm, and the creepage distance of the short side L2 of the front glass 04 in the high voltage photovoltaic module 10 is d+4mm, wherein c is the creepage distance of the long side L1' of the front glass 04' in the photovoltaic module 10' below 1500V, and d is the creepage distance of the short side L2' of the front glass 04' in the photovoltaic module 10' below 1500V.

[0059] Specifically, the embodiment of the present application provides a high-voltage photovoltaic module 10 for use in high-altitude areas. The voltage level of the high-voltage photovoltaic module 10 is 2000V. Compared with the 1500V photovoltaic module, the high-voltage photovoltaic module 10 needs to be connected to a 2000V junction box. When the creepage distance of the back panel 03 in the high-voltage photovoltaic module 10 increases, the creepage distance of the front glass 04 in the corresponding high-voltage photovoltaic module 10 also needs to increase. When the creepage distance of the long side L1' of the front glass 04' in the photovoltaic module 10' below 1500V is c, and the creepage distance of the short side L2' of the front glass 04' is d, the creepage distance of the long side L1 of the front glass 04 in the high-voltage photovoltaic module 10 is c+4mm, and the creepage distance of the short side L2 of the front glass 04 in the high-voltage photovoltaic module 10 is d+4mm. That is to say, the creepage distance of the long side L1 of the front glass 04 of the high-voltage photovoltaic module 10 is relatively The creepage distance of the long side L1' of the front glass 04' of the photovoltaic module 10' below 1500V is increased by 4mm, and the creepage distance of the short side L2 of the front glass 04 of the high-voltage photovoltaic module 10 is increased by 4mm relative to the creepage distance of the short side L2' of the front glass 04' of the photovoltaic module 10' below 1500V. In this way, by increasing the creepage distance of the long side L1 and the creepage distance of the short side L2 of the front glass 04 in the high-voltage photovoltaic module 10, the increase in the creepage distance of the long side L1 and the increase in the creepage distance of the short side L2 of the front glass 04 in the high-voltage photovoltaic module 10 can be made to correspond to the increase in the creepage distance of the long side L1 and the increase in the creepage distance of the short side L2 of the back panel 03, thereby improving the integrity of the high-voltage photovoltaic module 10 and enabling the high-voltage photovoltaic module 10 to be connected to a 2000V junction box, so that the high-voltage photovoltaic module 10 can pass the 30KV pulse voltage test.

[0060] In summary, the high-voltage photovoltaic module provided by the utility model achieves at least the following beneficial effects: by designing a high-voltage photovoltaic module including a first packaging material, the anti-puncture capability of the high-voltage photovoltaic module when used in high-altitude areas can be improved; the two different interlayer structure designs of the high-voltage photovoltaic module can further reduce the thickness of the module and reduce the production cost on the basis of improving the anti-puncture capability of the high-voltage photovoltaic module in high-altitude areas; by setting the thickness range of the first packaging material, each of the five-layer structure of the PET layer in the first packaging material, the EVA layer on both sides of the PET layer, the coating between the PET layer and the EVA layer on one side, and the coating between the PET layer and the EVA layer on the other side has a certain thickness, and the anti-puncture capability in high-altitude areas is further improved by layer thickness control; by setting the thickness range of the PET layer in the first packaging material, the PET layer is controlled to a certain thickness, and the anti-puncture capability of the high-voltage photovoltaic module in high-altitude areas is further improved by layer thickness control based on the material characteristics of the PET layer; by setting the thickness of the EVA layer on both sides of the PET layer to be the same and controlled at 70μ m-430μm in thickness, so as to improve the uniformity, waterproofness and impact resistance of the first packaging material; through the multiple selectivity of the coating material, the material composition diversity of the first packaging material can be enriched while satisfying the bonding strength between the PET layer and the EVA layer; by controlling the thickness of the coating within a certain range, the uniformity and flatness of the coating can be maintained on the basis of protecting the PET layer from damage, and the adhesion to the EVA layer can be improved; the use of N-type photovoltaic modules as high-voltage photovoltaic modules can reduce the degree of change in the internal resistance of the photovoltaic modules caused by temperature changes, reduce the loss of the photovoltaic modules in the photoelectric conversion process in high-altitude areas, and improve the stability of photoelectric conversion in high-altitude areas; increase the creepage distance of the long and short sides of the backboard in the high-voltage photovoltaic module, and increase the creepage distance of the long and short sides of the front glass in the high-voltage photovoltaic module, so that the increase in the creepage distance of the long and short sides of the front glass in the high-voltage photovoltaic module corresponds to the increase in the creepage distance of the long and short sides of the backboard, improve the integrity of the high-voltage photovoltaic module, and enable the high-voltage photovoltaic module to be connected to the 2000V junction box, so that the high-voltage photovoltaic module passes the 30KV pulse voltage test.

[0061] Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A high voltage photovoltaic module, characterized in that: The structure of the high voltage photovoltaic module includes, from bottom to top, a back sheet, a first packaging material, a solar cell, a second packaging material, and a front glass; or, the structure of the high voltage photovoltaic module includes, from bottom to top, a back sheet, a first packaging material, a solar cell, a first packaging material, and a front glass; The first packaging material comprises a PET layer, and a single EVA layer is coated on both the upper and lower surfaces of the PET layer, wherein a coating layer exists between the PET layer and the EVA layer; the structure of the first packaging material from top to bottom is EVA layer, coating layer, PET layer, coating layer, and EVA layer in sequence; The second packaging material is a polyolefin elastomer material.

2. The high voltage photovoltaic module according to claim 1, characterized in that: The thickness of the first packaging material is 330 μm-900 μm.

3. The high voltage photovoltaic module according to claim 1, characterized in that: The thickness of the PET layer in the first packaging material is 65 μm-160 μm.

4. The high voltage photovoltaic module according to claim 1, characterized in that: The EVA layers located above and below the PET layer have the same thickness.

5. The high voltage photovoltaic module according to claim 4, characterized in that: The thickness of the EVA layer in the first packaging material is 70 μm-430 μm.

6. The high voltage photovoltaic module according to claim 1, characterized in that: The coating material is one of fluorine-containing polyurethane, fluorine-containing acrylic acid or silicone.

7. The high voltage photovoltaic module according to claim 6, characterized in that: The coating thickness is 10±5 μm.

8. The high voltage photovoltaic module according to claim 1, characterized in that: The high voltage photovoltaic module is an N-type photovoltaic module.

9. The high voltage photovoltaic module according to claim 1, characterized in that: The creepage distance of the long side of the backboard in the high-voltage photovoltaic module is a+4mm, and the creepage distance of the short side of the backboard in the high-voltage photovoltaic module is b+4mm, where a is the creepage distance of the long side of the backboard in the photovoltaic module below 1500V, and b is the creepage distance of the short side of the backboard in the photovoltaic module below 1500V.

10. The high voltage photovoltaic module according to claim 1, characterized in that: The creepage distance of the long side of the front glass in the high-voltage photovoltaic module is c+4mm, and the creepage distance of the short side of the front glass in the high-voltage photovoltaic module is d+4mm, wherein c is the creepage distance of the long side of the front glass in the photovoltaic module below 1500V, and d is the creepage distance of the short side of the front glass in the photovoltaic module below 1500V.

Images