Photovoltaic module

Abstract

The photovoltaic module comprises a laminated piece and a junction box, the laminated piece comprises a front panel, a battery piece, a first fireproof film, a back panel and a second fireproof film which are sequentially laminated from top to bottom, the first fireproof film is provided with a first through hole, the back panel is provided with a second through hole, and the second fireproof film is provided with a third through hole; the first through hole, the second through hole and the third through hole are correspondingly arranged, the junction box is arranged on the side, away from the back panel, of the second fireproof film and is arranged at the third through hole, the junction box is connected with the battery piece through a bus bar, and the bus bar penetrates through the first through hole, the second through hole and the third through hole; the first fireproof film and the second fireproof film both contain phosphorus elements. The first fireproof film and the second fireproof film can prevent flames from burning through the photovoltaic module, enhance the heat insulation and flame retardation capability of the junction box, and prevent heat transferred by combustion from directly melting and falling off the junction box, thereby ensuring the safety of the photovoltaic module.

Description

Technical Field

[0001] The present application relates to the technical field of new energy, and in particular to a photovoltaic module. Background Art

[0002] In recent years, with the rapid growth of the photovoltaic industry, there have been countless fires caused by the combustion of photovoltaic modules. For example, the fire occurred at an Apple factory in the United States. The fire started from the spontaneous combustion of photovoltaic modules on the roof. This fire brought inevitable property losses and personal safety issues, and sounded the alarm for the photovoltaic industry in various countries.

[0003] The fire protection requirements of photovoltaic modules in various countries are increasing day by day. For example, the UL-790 fire test standard introduced in the North American market stipulates that photovoltaic modules must pass this test standard before they can be widely used. Since photovoltaic modules are directly integrated with buildings and are close to people's production and living places and materials, the fire hazards caused by photovoltaic module failures or construction problems cannot be ignored. The safety of photovoltaic modules has become an issue that needs to be solved urgently. Summary of the invention

[0004] Based on this, it is necessary to provide a photovoltaic module that can prevent being burned through by fire.

[0005] A photovoltaic module includes a laminate and a junction box, the laminate includes: a front panel, a battery cell, a first fireproof film, a back panel and a second fireproof film stacked in sequence from top to bottom, the first fireproof film is provided with a first through hole, the back panel is provided with a second through hole, the second fireproof film is provided with a third through hole, the first through hole, the second through hole and the third through hole are arranged correspondingly, the junction box is arranged on a side of the second fireproof film away from the back panel and is arranged at the third through hole, the junction box is connected to the battery cell through a bus bar, and the bus bar is passed through the first through hole, the second through hole and the third through hole; the first fireproof film and the second fireproof film both contain phosphorus.

[0006] In one embodiment, the front panel and the back panel are of the same size and are arranged correspondingly, and the battery cell is clamped between the front panel and the back panel;

[0007] The area of ​​the first fireproof film is substantially the same as that of the back panel, and they are arranged correspondingly;

[0008] The area of ​​the second fireproof film is smaller than that of the first fireproof film, the orthographic projection of the junction box on the second fireproof film is located inside the second fireproof film, and the junction box does not extend from the edge of the second fireproof film.

[0009] In one embodiment, the laminate further includes a heat insulation layer, which is disposed between the back panel and the second fireproof film, and the bus bar located on the side of the back panel close to the second fireproof film does not extend from the edge of the second fireproof film.

[0010] In one embodiment, the thermal insulation layer is made of ceramic fiber or porous vacuum silicon.

[0011] In one embodiment, a fourth through hole is provided on the thermal insulation layer, and the fourth through hole is arranged corresponding to the first through hole, and the bus bar is sequentially passed through the first through hole, the second through hole, the fourth through hole and the third through hole.

[0012] In one embodiment, the back panel includes a stacked base layer and an aluminum foil layer, the base layer is connected to the first fire retardant film, the aluminum foil layer is connected to the second fire retardant film, and the second through hole includes a first hole passing through the base layer and a second hole passing through the aluminum foil layer.

[0013] In one embodiment, the first hole and the second hole are of the same size and are arranged correspondingly, and the diameter of the second hole is 30 mm to 100 mm;

[0014] The laminate further comprises a gasket, which is sandwiched between the aluminum foil layer and the second fireproof film, and a fifth through hole is provided on the gasket, and the orthographic projection of the edge of the second through hole on the gasket is located between the edge of the gasket and the edge of the fifth through hole;

[0015] The bus bar is sequentially disposed through the first through hole, the second through hole, the fifth through hole and the third through hole.

[0016] In one embodiment, the first hole and the second hole are arranged correspondingly, and the diameter of the second hole is 30 mm to 100 mm.

[0017] The orthographic projection of the edge of the first hole on the aluminum foil layer is located inside the second hole.

[0018] In one embodiment, a weather-resistant coating is provided on a surface of the aluminum foil layer away from the base layer;

[0019] And / or, a weather-resistant coating is provided on a surface of the base layer away from the aluminum foil layer.

[0020] In one embodiment, the back panel is made of glass, and the thickness of the back panel is 2 mm to 6 mm; and / or, the front panel is made of glass, and the thickness of the front panel is 2 mm to 6 mm.

[0021] Compared with the prior art, the photovoltaic module provided by the present application includes a laminate and a junction box, and the laminate includes a front panel, a battery cell, a first fireproof film, a back panel and a second fireproof film which are stacked in sequence from top to bottom, wherein the first fireproof film and the second fireproof film both contain phosphorus element, and when the first fireproof film and the second fireproof film are burned by flames, the compounds containing phosphorus element decompose at high temperature to form compounds such as phosphorus pentoxide, which can isolate oxygen, form an oxide film insulation layer, and inhibit combustion, thereby making it difficult for flames to burn through the photovoltaic module; secondly, the phosphorus element contained in the first fireproof film and the second fireproof film can release non-flammable gases when decomposed, and these gases can dilute the surrounding combustible gases and reduce the spread rate of the flame; the compounds containing phosphorus element in the first fireproof film and the second fireproof film can also absorb a large amount of heat during the decomposition process, which can reduce the temperature of the surrounding environment and slow down the rate of the combustion reaction, thereby preventing the flame from burning through the photovoltaic module. In addition, the second fireproof film located between the back panel and the junction box enhances the heat insulation and flame retardancy of the junction box, preventing the heat transferred by the combustion from directly melting and falling off the junction box, thereby ensuring the safety of the photovoltaic module and making the photovoltaic module fireproof. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 An exploded view of a photovoltaic module according to an embodiment of the present application;

[0024] Figure 2 An exploded view of a photovoltaic module according to another embodiment of the present application;

[0025] Figure 3 A schematic diagram of a second fireproof film and a heat insulation layer according to an embodiment of the present application;

[0026] Figure 4 A schematic diagram of a gasket according to an embodiment of the present application;

[0027] Figure 5 An exploded view of a back panel according to an embodiment of the present application.

[0028] Figure numerals: 10, laminate; 110, front panel; 120, battery cell; 130, first fireproof film; 131, first through hole; 140, back panel; 1401, base layer; 1402, aluminum foil layer; 1403, weather-resistant coating; 141, second through hole; 1411, first hole; 1412, second hole; 150, second fireproof film; 151, third through hole; 160, thermal insulation layer; 161, fourth through hole; 170, gasket; 171, fifth through hole; 20, junction box. DETAILED DESCRIPTION

[0029] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0030] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are for illustrative purposes only and do not represent the only implementation method.

[0031] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0032] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are indirectly in contact through an intermediate medium. Moreover, a first feature being “above”, “above”, or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0033] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more related listed items.

[0034] See also Figures 1 to 5 The present application provides a photovoltaic module, which includes a laminate 10 and a junction box 20. The laminate 10 includes a front panel 110, a battery cell 120, a first fireproof film 130, a back panel 140 and a second fireproof film 150 stacked in sequence from top to bottom, wherein the first fireproof film 130 is provided with a first through hole 131, the back panel 140 is provided with a second through hole 141, and the second fireproof film 150 is provided with a third through hole 151. The first through hole 131, the second through hole 141 and the third through hole 151 are correspondingly arranged. The junction box 20 is arranged on a side of the second fireproof film 150 away from the back panel 140 and is arranged at the third through hole 151. The junction box 20 is connected to the battery cell 120 through a bus bar, and the bus bar (not shown in the figure) is passed through the first through hole 131, the second through hole 141 and the third through hole 151; the first fireproof film 130 and the second fireproof film 150 both contain phosphorus.

[0035] It can be understood that since both the first fireproof film 130 and the second fireproof film 150 contain phosphorus, when the first fireproof film 130 and the second fireproof film 150 are burned by flames, the compounds containing phosphorus decompose at high temperature to form compounds such as phosphorus pentoxide, which can isolate oxygen, form an oxide film protective layer, and inhibit combustion, thereby making it difficult for flames to burn through photovoltaic modules; secondly, the phosphorus contained in the first fireproof film 130 and the second fireproof film 150 can release non-flammable gases when decomposing, and these gases can dilute the surrounding combustible gases and reduce the spread of flames; moreover, the compounds containing phosphorus in the first fireproof film 130 and the second fireproof film 150 will also absorb a large amount of heat during the decomposition process, which can reduce the temperature of the surrounding environment and slow down the rate of combustion reaction, thereby preventing flames from burning through photovoltaic modules.

[0036] In addition, the second fireproof film 150 is sandwiched between the back panel 140 and the junction box 20. On the basis that the first fireproof film 130 can prevent the flame from burning through the laminate 10, that is, the first fireproof film 130 provides the first layer of protection for the junction box 20. The second fireproof film 150 located between the back panel 140 and the junction box 20 enhances the heat insulation and flame retardancy of the junction box 20, preventing the heat transferred by the combustion from directly melting and falling off the junction box 20. The second fireproof film 150 can provide the second layer of protection for the junction box 20, thereby ensuring the safety of the photovoltaic module, and further making the photovoltaic module have fireproof performance.

[0037] It can be understood that the battery cell 120 and the junction box 20 are respectively located on both sides of the back panel 140, the bus bar is provided through the first through hole 131, the second through hole 141 and the third through hole 151, and one end of the bus bar is connected to the battery cell 120 by welding or bonding, and the other end of the bus bar is connected to the junction box 20, that is, the bus bar electrically connects the battery cell 120 and the junction box 20. The first fireproof film 130 and the second fireproof film 150 separate the bus bar into a portion located between the battery cell 120 and the back panel 140, a portion located between the first fireproof film 130 and the second fireproof film 150, and a portion located between the back panel 140 and the junction box 20. When a fire occurs on one side of the cell 120, the first fireproof film 130 and the second fireproof film 150 can prevent the flame and the heat generated by the flame from being transferred along the busbar to the side of the junction box 20; similarly, when a fire occurs on one side of the junction box 20, the first fireproof film 130 and the second fireproof film 150 can prevent the flame and the heat generated by the flame from being transferred along the busbar to the side of the cell 120. In this way, the first fireproof film 130 and the second fireproof film 150 can provide protection for the busbar, prevent the flame from burning the busbar, and prevent the flame and the heat generated by the flame from being transferred between the junction box 20 and the cell 120 through the busbar, thereby preventing the photovoltaic module from being burned through and preventing the photovoltaic module from causing a major fire.

[0038] It should be explained that the first fireproof film 130 and the second fireproof film 150 can be made of the same material, so as to simplify the purchase process and the process of producing the laminate 10. Schematically, the first fireproof film 130 and the second fireproof film 150 can be adhesive films, which have adhesive properties, so that the first fireproof film 130 and the second fireproof film 150 can be connected to the back panel 140 in an adhesive manner. In this way, the production of the laminate 10 is relatively simple, thereby improving production efficiency and reducing production costs.

[0039] Further, the first through hole 131, the second through hole 141, and the third through hole 151 may be circular through holes, or square, oval, or other shaped through holes, and the first through hole 131, the second through hole 141, and the third through hole 151 may be of the same shape or different shapes, and the sizes of the first through hole 131, the second through hole 141, and the third through hole 151 may be the same or different, as long as the busbar can be passed through them. This application does not limit this.

[0040] In one embodiment, the front panel 110 and the back panel 140 are of the same size and are arranged correspondingly, and the cell 120 is clamped between the front panel 110 and the back panel 140; the area of ​​the first fireproof film 130 is substantially the same as the area of ​​the back panel 140, and they are arranged correspondingly. In other words, the back panel 140 is basically covered and protected by the first fireproof film 130. The first fireproof film 130 can prevent the flame on the side of the front panel 110 from being transmitted to the side of the back panel 140, and can also prevent the flame on the side of the back panel 140 from being transmitted to the side of the front panel 110. In this way, the first fireproof film 130 protects the laminate 10 in a larger and more comprehensive range, and can better prevent the laminate 10 from being burned through by flames, thereby improving the fireproof performance of the photovoltaic module.

[0041] Furthermore, the area of ​​the second fireproof film 150 is smaller than the area of ​​the first fireproof film 130, the orthographic projection of the junction box 20 on the second fireproof film 150 is located within the second fireproof film 150, and the junction box 20 does not extend from the edge of the second fireproof film 150. In other words, the side of the junction box 20 close to the back panel 140 is located within the range of the second fireproof film 150, and the second fireproof film 150 can provide a second layer of protection for the junction box 20. In this way, the second fireproof film 150 can be saved, thereby reducing production costs.

[0042] In one embodiment, reference Figure 2 and Figure 3 The photovoltaic module also includes a heat insulation layer 160 (such as Figure 3 As shown by the dotted line in the figure, the heat insulation layer 160 is arranged between the back panel 140 and the second fireproof film 150, so that the heat transmitted by the flame combustion can be further prevented from directly melting and falling off the junction box 20, and the heat insulation and flame retardant ability of the junction box 20 is further enhanced, thereby improving the safety of the photovoltaic module.

[0043] Furthermore, the busbar located on the side of the back panel 140 close to the second fireproof film 150 does not extend from the edge of the second fireproof film 150. In other words, the second fireproof film 150 covers the busbar located on the side of the back panel 140 close to the second fireproof film 150, and affixes it to the side of the back panel 140 away from the battery cell 120. In this way, the second fireproof film 150 can protect the busbar.

[0044] Schematically, the heat insulating layer 160 is provided with an opening corresponding to the second through hole 141, and the busbar is passed through the opening, so as to prevent the busbar from extending from the edge of the second fireproof film 150, so that the heat insulating layer 160 can provide protection for both the junction box 20 and the busbar. Alternatively, the heat insulating layer 160 does not have an opening, and the busbar bypasses the heat insulating layer 160 from one side of the heat insulating layer 160, as long as the busbar does not extend from the edge of the second fireproof film 150, in this way, the heat insulating layer 160 can provide a third level of protection for the junction box 20.

[0045] Further, the material of the heat insulation layer 160 is ceramic fiber. It is understandable that ceramic fiber, also known as refractory fiber paper, is a man-made inorganic non-metallic fiber material. Ceramic fiber is a glass phase or crystalline binary compound composed of aluminum oxide and silicon dioxide as the main components. Therefore, ceramic fiber can withstand high temperatures. And ceramic fiber has poor heat transfer capacity. Since the fibers in the ceramic fiber have no clear directionality when interlaced, and the heat transfer is mainly carried out along the fiber direction, and since the fibers are rarely in vertical contact when in contact with the heat source, it makes it difficult for heat to be transferred quickly. And the contact points of the fibers can reach 80%, which further increases the thermal resistance during heat transfer. Since the ceramic fiber itself is opaque, the heat rays cannot be transmitted in the fibers of the ceramic fiber, and the fiber area is small, and the radiation received is small, so that the heat radiation is basically not transmitted on the fibers of the ceramic fiber. Also, because the ceramic fiber contains a large amount of gas inside, these gases are mainly present in the air chamber formed by the interlacing of the fibers, and the air chamber is filled with still air. The heat transfer capacity of still air is very poor, so it can effectively hinder the invasion of hot air flow. These air chambers not only have poor heat transfer effects, but also further enhance the refractory effect of the ceramic fibers.

[0046] Therefore, ceramic fibers can be used in high-temperature environments, and refractory fibers have low thermal conductivity, which can effectively prevent heat transfer. A porous vacuum silicon material is used as the thermal insulation layer 160 and is arranged at the junction box 20. In this way, the junction box 20 can be isolated from the temperature caused by flame combustion, preventing the temperature of the junction box 20 from rising to the melting point, thereby preventing the junction box 20 from melting and falling off.

[0047] Furthermore, the material of the thermal insulation layer 160 is porous vacuum silicon. Porous vacuum silicon is composed of nano-silicon dioxide, silicate and other additives. The thermal insulation principle of porous vacuum silicon has extremely high porosity and extremely low thermal conductivity due to its unique microstructure and material properties. The pore size of porous vacuum silicon is 10nm~40nm. The pore size of porous vacuum silicon is smaller than that of air molecules with a mean free path of 68nm, which prevents the molecules inside the pores of porous vacuum silicon from colliding, thereby achieving ultra-high thermal insulation performance. The high porosity of porous vacuum silicon can achieve a vacuum-like effect, further enhancing the thermal insulation performance of porous vacuum silicon. At the same time, the thermal conductivity of porous vacuum silicon is 0.012W / m·k, which can effectively prevent the transfer of heat. Using porous vacuum silicon material as the thermal insulation layer 160, it can isolate the transfer of heat during flame combustion, prevent the temperature at the junction box 20 from reaching the melting point, and thus prevent the wiring from melting and falling off.

[0048] In one embodiment, the heat insulating layer 160 is provided with a fourth through hole 161, and the fourth through hole 161 is arranged corresponding to the first through hole 131, and the busbar is sequentially passed through the first through hole 131, the second through hole 141, the fourth through hole 161 and the third through hole 151. In this way, the production of the photovoltaic module is simpler, thereby improving production efficiency and saving costs.

[0049] In one embodiment, the back panel 140 includes a base layer 1401 and an aluminum foil layer 1402 which are stacked, the base layer 1401 is connected to the first fireproof film 130, the aluminum foil layer 1402 is connected to the second fireproof film 150, and the second through hole 141 includes a first hole 1411 which penetrates the base layer 1401 and a second hole 1412 which penetrates the aluminum foil layer 1402. In this way, the production of the back panel 140 and the production of the photovoltaic module are simpler. The back panel 140 composed of the base layer 1401 and the aluminum foil layer 1402 has a greatly improved strength and hardness compared with the traditional back panel, and can better protect the battery cell 120 from the high temperature lamination process. At the same time, the aluminum foil layer 1402 has a high melting point and is not easy to burn. The back panel 140 composed of the base layer 1401 and the aluminum foil layer 1402 can not only play a good flame retardant effect, but also has a lower water vapor permeability, so it is suitable for the fire protection requirements of the photovoltaic module.

[0050] In one embodiment, the first hole 1411 and the second hole 1412 are of the same size and are arranged correspondingly, the second hole 1412 is a circular hole, and the diameter of the second hole 1412 is 30 mm to 100 mm. It can be understood that the bus bar is passed through the second hole 1412, and the aluminum foil layer 1402 is conductive. If the diameter of the second hole 1412 is less than 30 mm, the creepage distance between the bus bar and the edge of the second hole 1412 of the aluminum foil layer 1402 is too small, and the current will break through the aluminum foil layer 1402 and the back panel 140, causing leakage; if the diameter of the second hole 1412 is greater than 100 mm, it will affect the support of the back panel 140 for the battery cell 120 and the fire and heat resistance of the back panel 140. Therefore, in this embodiment, the diameter of the second hole 1412 is 30 mm to 100 mm, which is appropriate. In this way, it can be ensured that the current in the busbar will not break through the foil layer and the back panel 140, and will not affect the fireproof performance of the back panel 140. Illustratively, the diameter of the second hole 1412 can also be 30 mm, 50 mm, 60 mm, or a range consisting of any two of these values. This application is not limited to this.

[0051] Further, refer to Figure 4 The photovoltaic module further includes a gasket 170, which is clamped between the aluminum foil layer 1402 and the second fireproof film 150. The gasket 170 is provided with a fifth through hole 171, and the second through hole 141 (such as Figure 4The orthographic projection of the edge of the first through hole 131 (shown by the dotted line in FIG. 1 ) on the gasket 170 is located between the edge of the gasket 170 and the edge of the fifth through hole 171; the bus bar is sequentially arranged through the first through hole 131, the second through hole 141, the fifth through hole 171 and the third through hole 151. In this way, it is possible to prevent the bus bar from being exposed too much from the second through hole 141, reduce the risk of leakage, and thus improve the safety of the photovoltaic module.

[0052] Further, the fifth through hole 171 is a circular hole, and the diameter of the fifth through hole 171 is 10 mm to 30 mm. In this way, it is possible to prevent the busbar from being exposed too much from the second through hole 141. Illustratively, the diameter of the fifth through hole 171 can also be 15 mm, 20 mm, 25 mm, or a range consisting of any two of these values. This application is not limited to this.

[0053] Furthermore, there are two gaskets 170, one of which is clamped between the aluminum foil layer 1402 and the second fireproof film 150, and the other gasket 170 is clamped between the base layer 1401 and the first fireproof film 130, and the busbar is sequentially inserted through the first through hole 131, a fifth through hole 171, the second through hole 141, another fifth through hole 171 and the third through hole 151. In this way, the current in the busbar can be further prevented from breaking through the foil layer and the back panel 140, thereby improving the safety of the photovoltaic module.

[0054] In one embodiment, the photovoltaic module also includes a frame for fixing the laminate 10, and the material of the frame is a non-conductive polymer. Since the back plate includes an aluminum foil layer 1402, the aluminum foil layer 1402 has conductivity. If the frame uses aluminum or other conductive materials, it will cause current to be conducted to the frame, causing leakage. The frame in the present embodiment uses a non-conductive polymer, which can isolate the current and prevent the photovoltaic module from leaking. Further, the polymer frame is co-extruded and injection-molded by polyurethane and glass fiber materials, and the surface of the frame uses nylon material as a coating, and the surface of the nylon material is combined with an anti-slip design, so that the slippage in the production of photovoltaic modules can be effectively solved, and the laminate 10 damage caused by friction between the frames is avoided. At the same time, the use of paper corner protectors in the packaging process is also omitted, reducing the packaging cost.

[0055] In one embodiment, the first hole 1411 and the second hole 1412 are arranged correspondingly, and the orthographic projection of the edge of the first hole 1411 on the aluminum foil layer 1402 is located inside the second hole 1412. In other words, the first hole 1411 is smaller than the second hole 1412. The second hole 1412 ensures that the creepage distance between the bus bar and the edge of the second hole 1412 is appropriate, so that the aluminum foil layer 1402 will not be broken down. Since the first hole 1411 is smaller than the second hole 1412, the gasket 170 is omitted, and the bus bar can be prevented from being exposed too much from the second hole 1412, thereby reducing the risk of leakage, thereby improving the safety of the photovoltaic module.

[0056] In one embodiment, reference Figure 5 The surface of the aluminum foil layer 1402 on one side away from the base layer 1401 is provided with a weather-resistant coating 1403. It can be understood that the weather-resistant coating 1403 can improve the tolerance of the aluminum foil layer 1402 to temperature, light, wind and rain, bacteria, etc., so that the weather-resistant coating 1403 can not only improve the fireproof performance of the back panel 140, but also extend the service life of the back panel 140 and the service life of the laminate 10.

[0057] In one embodiment, a weather-resistant coating 1403 is provided on the surface of the base layer 1401 away from the aluminum foil layer 1402. As described above, the weather-resistant coating 1403 can improve the tolerance of the aluminum foil layer 1402 to temperature, light, wind, rain, bacteria, etc., so that the weather-resistant coating 1403 can not only improve the fireproof performance of the back panel 140, but also extend the service life of the back panel 140 and the service life of the laminate 10.

[0058] In one embodiment, the front panel 110 is glass, and the thickness of the front panel 110 is 2 mm to 6 mm. It is understandable that if the thickness of the glass as the front panel 110 is less than 2 mm, it is easy to break. If the thickness of the front panel 110 is greater than 6 mm, the deadweight of the laminate 10 will be increased, and the lighting of the battery cell 120 will be affected. Therefore, the thickness of the front panel 110 is 2 mm to 6 mm. It is suitable. By setting the thickness of the front panel 110 to 2 mm to 6 mm, the mechanical strength of the front panel 110 is improved, so that the front panel 110 is not easy to break, thereby increasing the fire resistance of the photovoltaic module. Schematically, the thickness of the front panel 110 can also be 3 mm, 4 mm, 5 mm, or a range consisting of any two of these values. This application is not limited to this.

[0059] In one embodiment, the back panel 140 is glass, and the thickness of the back panel 140 is 2 mm to 6 mm. As described above, setting the thickness of the front panel 110 to 2 mm to 6 mm can not only improve the mechanical strength of the back panel 140, making the back panel 140 less likely to break, increase the fire resistance of the photovoltaic module, but also reduce the production cost of the photovoltaic module. Schematically, the thickness of the back panel 140 can also be 3 mm, 4 mm, 5 mm, or a range consisting of any two of these values. This application is not limited to this.

[0060] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0061] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the scope of patent protection of the present application shall be subject to the attached claims.

Claims

1. A photovoltaic module, characterized in that: The invention comprises a laminate (10) and a junction box (20), wherein the laminate (10) comprises: a front panel (110), a battery cell (120), a first fireproof film (130), a back panel (140) and a second fireproof film (150) stacked in sequence from top to bottom, wherein the first fireproof film (130) is provided with a first through hole (131), the back panel (140) is provided with a second through hole (141), the second fireproof film (150) is provided with a third through hole (151), and the The first through hole (131), the second through hole (141) and the third through hole (151) are arranged correspondingly, the junction box (20) is arranged on a side of the second fireproof film (150) away from the back panel (140), and is arranged at the third through hole (151), the junction box (20) is connected to the battery cell (120) through a bus bar, and the bus bar is passed through the first through hole (131), the second through hole (141) and the third through hole (151); The first fireproof film (130) and the second fireproof film (150) both contain phosphorus.

2. The photovoltaic module according to claim 1, characterized in that: The front panel (110) and the back panel (140) are of the same size and are arranged correspondingly, and the battery cell (120) is clamped between the front panel (110) and the back panel (140); The area of ​​the first fireproof film (130) is substantially the same as the area of ​​the back panel (140), and they are arranged correspondingly; The area of ​​the second fireproof film (150) is smaller than the area of ​​the first fireproof film (130), the orthographic projection of the junction box (20) on the second fireproof film (150) is located within the second fireproof film (150), and the junction box (20) does not extend from the edge of the second fireproof film (150).

3. The photovoltaic module according to claim 1, characterized in that: The laminate (10) further includes a heat insulating layer (160), wherein the heat insulating layer (160) is disposed between the back panel (140) and the second fireproof film (150), and the bus bar located on the side of the back panel (140) close to the second fireproof film (150) does not extend from the edge of the second fireproof film (150).

4. The photovoltaic module according to claim 3, characterized in that: The material of the heat insulation layer (160) is ceramic fiber or porous vacuum silicon.

5. The photovoltaic module according to claim 3, characterized in that: The heat insulation layer (160) is provided with a fourth through hole (161), and the fourth through hole (161) is arranged corresponding to the first through hole (131), and the bus bar is sequentially passed through the first through hole (131), the second through hole (141), the fourth through hole (161) and the third through hole (151).

6. The photovoltaic module according to claim 1, characterized in that: The back panel (140) includes a stacked base layer (1401) and an aluminum foil layer (1402), the base layer (1401) is connected to the first fireproof film (130), the aluminum foil layer (1402) is connected to the second fireproof film (150), and the second through hole (141) includes a first hole (1411) penetrating the base layer (1401) and a second hole (1412) penetrating the aluminum foil layer (1402).

7. The photovoltaic module according to claim 6, characterized in that: The first hole (1411) and the second hole (1412) are of the same size and are arranged correspondingly, and the diameter of the second hole (1412) is 30 mm to 100 mm; The laminate (10) further comprises a gasket (170), wherein the gasket (170) is clamped between the aluminum foil layer (1402) and the second fireproof film (150), and a fifth through hole (171) is provided on the gasket (170), and the orthographic projection of the edge of the second through hole (141) on the gasket (170) is located between the edge of the gasket (170) and the edge of the fifth through hole (171); The bus bar is sequentially inserted into the first through hole (131), the second through hole (141), the fifth through hole (171) and the third through hole (151).

8. The photovoltaic module according to claim 6, characterized in that: The first hole (1411) and the second hole (1412) are arranged correspondingly, and the diameter of the second hole (1412) is 30 mm to 100 mm. The orthographic projection of the edge of the first hole (1411) on the aluminum foil layer (1402) is located inside the second hole (1412).

9. The photovoltaic module according to claim 6, characterized in that: A weather-resistant coating (1403) is provided on the surface of the aluminum foil layer (1402) away from the base layer (1401); And / or, a weather-resistant coating (1403) is provided on a surface of the base layer (1401) away from the aluminum foil layer (1402).

10. The photovoltaic module according to claim 1, characterized in that: The back panel (140) is made of glass, and the thickness of the back panel (140) is 2 mm to 6 mm; and / or the front panel (110) is made of glass, and the thickness of the front panel (110) is 2 mm to 6 mm.

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