Photovoltaic module

Abstract

The utility model provides a photovoltaic assembly, which comprises front plate glass, a photovoltaic cell layer, middle layer glass and back plate glass which are laminated, a hollow layer is formed between the middle layer glass and the back plate glass, the photovoltaic assembly further comprises at least one junction box group, the junction box group comprises a first junction box and a second junction box, and the first junction box is connected with the second junction box. The first junction box corresponds to the second junction box, the first junction box is fixed on one side, adjacent to the hollow layer, of the middle layer glass, and the first junction box is electrically connected with a bus bar; the second junction box is fixed to the side, away from the hollow layer, of the backboard glass, the second junction box is electrically connected with the first junction box, and the second junction box is further used for being electrically connected with a load.

Description

Technical Field

[0001] The utility model relates to the field of building integrated photovoltaics, and particularly to a photovoltaic module. Background Art

[0002] There are two types of junction boxes used in building photovoltaic insulating glass curtain walls, one is a back-connected junction box and the other is a side-connected junction box.

[0003] The volume of the side-connected junction box is restricted by the installation spacing of the building photovoltaic insulating glass curtain wall, and its rated current is small, which cannot meet the requirements of the current building photovoltaic insulating glass curtain wall with a current exceeding 15A for the junction box.

[0004] The back-connected junction box can carry large currents, but the structural design of the building photovoltaic insulating glass curtain wall is unreasonable. One installation method is that in the building photovoltaic insulating glass curtain wall, the back-connected junction box is installed on the outermost glass on the back of the building photovoltaic insulating glass curtain wall and is electrically connected to the bus bar of the photovoltaic cell layer of the building photovoltaic insulating glass curtain wall. However, this will cause the bus bar to have a long lead-out distance and is prone to bus bar breakage. Another installation method is to install the back-connected junction box on the edge of the glass on the side of the insulating layer close to the photovoltaic cell layer, and bury the junction box with the second sealant of the insulating layer. Although the lead-out distance of the bus bar is shortened in this way, reducing the risk of breakage, burying the junction box with the sealant will result in poor heat dissipation of the junction box. Another installation method is to install the back-connected junction box on the side of the inflatable layer of the insulating layer close to the photovoltaic cell layer, and the connecting cable led out from the junction box passes through the insulating layer and the back panel glass to be connected to the load, which will reduce the stability and sealing performance of the photovoltaic curtain wall. The above installation methods of the back-connected junction box have risks such as bus bar breakage, poor heat dissipation of the junction box, and poor sealing and stability, bringing risks to the later use of the building photovoltaic insulating glass curtain wall in the building. Summary of the Utility Model

[0005] The utility model aims to solve one of the technical problems in the related art to a certain extent. For this purpose, the utility model provides a photovoltaic module.

[0006] To achieve the above object, as the first aspect of the utility model, there is provided a photovoltaic module, including: a front panel glass, a photovoltaic cell layer, an intermediate layer glass, and a back panel glass which are stacked, a hollow layer is formed between the intermediate layer glass and the back panel glass, the photovoltaic module further includes at least one junction box group, the junction box group includes a first junction box and a second junction box, the first junction box corresponds to the second junction box, the first junction box is fixed on the side of the intermediate layer glass adjacent to the hollow layer, and the second junction box is fixed on the side of the back panel glass facing away from the hollow layer; the first junction box is electrically connected to the bus bar, the second junction box is electrically connected to the first junction box, and the second junction box is further used for being electrically connected to a load.

[0007] Furthermore, at least one first through-hole and at least one second through-hole are provided on the photovoltaic module. The first through-hole is located in the intermediate layer glass and penetrates the intermediate layer glass. The second through-hole is located in the backplane glass and penetrates the backplane glass. The first through-holes and the second through-holes correspond to each other one by one, and the junction box group corresponds to the first through-holes. The first junction box is electrically connected to the bus bar through the corresponding first through-hole; the second junction box is electrically connected to the first junction box through the corresponding second through-hole.

[0008] Furthermore, the first junction box covers the first through-hole, and the opening of the first through-hole is closed by the first junction box. The second junction box covers the second through-hole, and the opening of the second through-hole is closed by the second junction box.

[0009] Furthermore, the photovoltaic module further includes at least one group of first support bars. At least one of the junction box groups corresponds to the first support bars. The first support bars are arranged in the hollow layer and are connected between the intermediate layer glass and the backplane glass. There is a set distance between the first support bars and the junction box group, and the set distance is greater than 5 mm.

[0010] Furthermore, the photovoltaic module further includes at least one group of second support bars. The first support bars are correspondingly arranged inside the second support bars. The second support bars are arranged at the edge of the hollow layer and connect the intermediate layer glass and the backplane glass.

[0011] Furthermore, there is a gap between the first support bar and the adjacent second support bar, and a first sealing cavity is formed between the first support bar and the adjacent second support bar; the intermediate layer glass, the first support bar adjacent to the first junction box, and the backplane glass enclose a second sealing cavity, and the first junction box is located in the second sealing cavity.

[0012] Furthermore, both the first support bar and the second support bar respectively include a support spacer bar, a first sealant and a second sealant provided at both ends of the support spacer bar. The support spacer bar is connected to the intermediate layer glass and the backplane glass through the first sealant at both ends, and the second sealant is provided on the outer side of the support spacer bar.

[0013] Furthermore, the first sealing cavity and / or the second sealing cavity is filled with a barrier gas.

[0014] Furthermore, the photovoltaic module includes a plurality of junction box groups, and the plurality of junction box groups are arranged inside the corresponding first support bars.

[0015] Further, the first junction box includes a split-type junction box and / or an integral junction box; and / or the second junction box includes a split-type junction box and / or an integral junction box.

[0016] The present utility model uses the method of connecting with a back-connected junction box group, which can meet the demand for large current of photovoltaic modules in a photovoltaic insulating glass curtain wall. The first junction box is arranged on one side of the middle glass layer close to the insulating layer, and the bus bar led out from the photovoltaic cell layer is electrically connected to the first junction box, shortening the length of the bus bar led out and reducing the risk of bus bar breakage. At the same time, the first junction box is located inside the insulating layer, solving the problem of poor heat dissipation caused by burying the junction box with sealant; on the other hand, the second junction box is arranged on the side of the back plate glass facing away from the insulating layer, facilitating heat dissipation and replacement and maintenance. At the same time, the second junction box is also connected to other components, reducing the stress on the connecting wires from the outside, thereby protecting the entire photovoltaic module. In addition, the setting of the second junction box reduces the external force on the inside of the photovoltaic module, thereby protecting the entire photovoltaic module and further improving the stability and sealing performance of the photovoltaic module.

[0017] The first junction box and the second junction box are electrically connected through a wire, ensuring that the current first flows into the first junction box and then flows into the second junction box through the first junction box. The second junction box is connected to other components to form a complete current path, improving the reliability of the entire current channel.

[0018] These features and advantages of the present utility model will be disclosed in detail in the following specific embodiments and the drawings. The best embodiments or means of the present utility model will be shown in detail in combination with the drawings, but it is not a limitation to the technical solution of the present utility model. In addition, these features, elements, and components appear in multiple numbers in each of the following texts and drawings, and different symbols or numbers are marked for convenience of representation, but they all represent components with the same or similar structures or functions. Description of the Drawings

[0019] The present utility model will be further described below with reference to the drawings:

[0020] Figure 1 It is a schematic structural diagram of an embodiment of the photovoltaic module provided by the present utility model.

[0021] Description of the Reference Numerals in the Drawings

[0022] 1: Photovoltaic module 11: Front plate glass

[0023] 12: First adhesive film 13: Photovoltaic cell layer

[0024] 131: Bus bar 14: Second adhesive film

[0025] 15: Intermediate layer glass 151: First through hole

[0026] 16: Hollow layer 161: First support bar

[0027] 161’: Second support bar 161a: First sealant

[0028] 161b: Second sealant 161c: Support spacer

[0029] 162: First seal cavity 163: Second seal cavity

[0030] 17: Backplate glass 171: Second through-hole

[0031] 18: Junction box group 181: First junction box

[0032] 182: Second junction box 19: Conductor Detailed implementation mode

[0033] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. Based on the embodiments in the implementation mode, it is intended to explain the present invention and should not be construed as a limitation to the present invention.

[0034] As used herein, the phrase "one embodiment" or "example" or "instance" means that a particular feature, structure, or characteristic described in connection with the embodiment itself can be included in at least one embodiment provided in the present application. The appearances of the phrase "in one embodiment" in various positions in the specification do not necessarily refer to the same embodiment.

[0035] As a first aspect of the present invention, a photovoltaic module 1 is provided, as Figure 1 shown, comprising: a front plate glass 11, a photovoltaic cell layer 13, an intermediate layer glass 15, and a backplate glass 17 which are stacked. A hollow layer 16 is formed between the intermediate layer glass 15 and the backplate glass 17. The photovoltaic module 1 further comprises at least one junction box group 18, and the junction box group 18 comprises a first junction box 181 and a second junction box 182. The first junction box 181 corresponds to the second junction box 182. The first junction box 181 is fixed on one side of the intermediate layer glass 15 adjacent to the hollow layer 16, and the second junction box 182 is fixed on the side of the backplate glass 17 facing away from the hollow layer 16. The first junction box 181 is electrically connected to the bus bar 131, the second junction box 182 is electrically connected to the first junction box 181, and the second junction box 182 is further used for electrically connecting to a load.

[0036] The utility model adopts the back-connected junction box group for connection, and the back-connected junction box can meet the photovoltaic hollow curtain wall's demand for large current of photovoltaic components. The first junction box 181 is arranged on the side of the middle glass layer 15 close to the hollow layer 16. The bus bar 131 led out from the photovoltaic cell layer 13 only needs to pass through the first through hole 151 and be electrically connected to the first junction box 181, which shortens the length of the bus bar 131 and reduces the risk of bus bar 131 breaking. On the other hand, the bus bar 131 does not pass through the hollow layer 16, avoiding the air in the hollow layer 16 from oxidizing the bus bar 131 for a long time. The bus bar 131 is preferably a tinned copper strip of tin-clad copper. At the same time, the first junction box 181 is located in the hollow layer 16, which solves the problem of poor heat dissipation caused by burying the junction box with sealant in the traditional technology.

[0037] On the other hand, the second junction box 182 is arranged on the side of the back panel glass 17 away from the hollow layer 16, which is convenient for releasing heat and replacing and repairing. At the same time, the second junction box 182 is also connected to other components, reducing the external force on the inside of the photovoltaic module, thereby protecting the entire photovoltaic module.

[0038] Preferably, the first junction box is disposed and fixed on the middle layer glass by means of sealant, and the second junction box is disposed and fixed on the back panel glass by means of sealant.

[0039] The photovoltaic module is provided with at least one first through hole 151 and at least one second through hole 171. The first through hole 151 is located in the middle layer glass 15 and penetrates the middle layer glass 15. The second through hole 171 is located in the back plate glass 17 and penetrates the back plate glass 17. The first through hole 151 corresponds to the second through hole 171. The first junction box 181 is electrically connected to the bus bar 131 through the corresponding first through hole 151; the second junction box 182 is electrically connected to the first junction box 181 through the corresponding second through hole 171. The first junction box 181 covers the first through hole 151, and the opening of the first through hole 151 is closed by the first junction box 181. The second junction box 182 covers the second through hole 171, and the opening of the second through hole 171 is closed by the second junction box 182.

[0040] In some embodiments, the first junction box 181 closes the opening of the first through hole 151 close to the hollow layer, and the second junction box group 182 closes the opening of the second through hole 171 away from the hollow layer. The purpose of this arrangement is to isolate and seal the hollow layer 16 from the outside and other layers, maintain the sealing effect of the hollow layer 16, and the setting of the junction box changes the point contact between the wire and the back plate glass into the surface contact between the second junction box and the back plate glass, further improving the stability and sealing of the photovoltaic module. Preferably, the sealing method can be a sealant plus a rubber ring.

[0041] Preferably, an electrical connection is formed between the first junction box 181 and the second junction box 182 through a wire 19, ensuring that the current first flows into the first junction box 181 and then from the first junction box 181 into the second junction box 182 through the wire 19. The second junction box 182 is connected to other components to form a complete current path, improving the reliability of the entire current channel.

[0042] In some embodiments, an electrical connection is formed between the first junction box and the second junction box through a cable wrapped with an insulating layer. The cable not only has the function of electrical connection but also provides a certain connection strength. When the photovoltaic module is connected to an external load, the photovoltaic module inevitably receives some external pulling and other stress effects. The connection strength provided by the cable can effectively relieve the pulling force from the outside, thereby protecting the internal photovoltaic devices from being affected by external forces.

[0043] The present utility model does not make special limitations on the type of the junction box. The first junction box and the second junction box are preferably but not limited to a split-type junction box and an integrated junction box. In some embodiments, the first junction box adopts an integrated junction box, and the second junction box adopts an integrated junction box. The positive bus bar and the negative bus bar led out from the photovoltaic cell layer 13 both pass through the first through hole 151 and are connected to the first junction box 181. The positive output connection cable led out from the first junction box 181 is connected to the positive input terminal of the second junction box, and the negative output connection cable led out from the first junction box 181 is connected to the negative input terminal of the second junction box. Then, the positive and negative connection cables respectively led out from the second junction box are connected to other loads to form a complete current path.

[0044] In other embodiments, the first junction box adopts a split-type junction box, and the second junction box adopts an integrated junction box. The positive bus bar led out from the photovoltaic cell layer is connected to the positive junction box of the first junction box, and the negative bus bar is connected to the negative junction box of the first junction box. The positive and negative output cables led out from the positive junction box and the negative junction box of the first junction box are respectively connected to the second junction box. Then, the positive and negative connection cables led out from the second junction box are connected to other loads to form a complete current path.

[0045] The photovoltaic module further includes at least one group of second support bars 161'. The second support bars are arranged in the hollow layer, located at the edge of the intermediate layer glass, and connect the intermediate layer glass 15 and the backplane glass 17. The photovoltaic module further includes at least one group of first support bars 161. At least one junction box group 18 corresponds to a first support bar 161. The first support bars 161 are arranged in the hollow layer 16. The first support bars 161 and the second support bars 161' are in one-to-one correspondence. The second support bars 161' are arranged outside the first support bars 161. The first support bars 161 connect the intermediate layer glass 15 and the backplane glass 17. The set distance between the first support bars 161 and the junction box group 18 is greater than 5 mm.

[0046] The position of the junction box group of the present utility model is not specially limited. The junction box group can be flexibly changed according to needs to improve applicability. The junction box group can be located at any position in the hollow layer, but there is a gap with the first support bar. Preferably, the gap size is greater than 5 mm. The purpose of setting the gap is to prevent the first support bar from contacting the first junction box and causing poor heat dissipation of the first junction box. The first support bar is arranged around the junction box to play an additional supporting role in the area around the junction box. This enables the photovoltaic module of the present utility model to have an additional supporting effect of the first support bar under the supporting effect of the conventional edge support bar. The supporting force at the central position of the conventional photovoltaic hollow glass is small, resulting in instability and easy deformation of the intermediate layer glass 15 and the backboard glass 17 at the central position. After adding the first support bar 161, the supporting force between the intermediate layer glass 15 and the backboard glass 17 can be strengthened, further improving the stability.

[0047] It should be noted that in the present invention, "outer side" refers to the direction of the first support bar or the second support bar close to the external environment in the plane where the hollow layer is located.

[0048] In some embodiments, a junction box group 18 is located at the central position of the photovoltaic module 1, corresponding to a group of first support bars 161. The first support bars 161 are arranged around the junction box group 181 and support the intermediate layer glass 15 and the backboard glass 17. The second support bars 161' are arranged at the positions of the support bars of the conventional photovoltaic module.

[0049] The intermediate layer glass 15, the first support bar 161 adjacent to the first junction box 181, and the backboard glass 17 enclose a second sealing cavity 163. The first junction box 181 is located in the second sealing cavity 163. There is a gap between the first support bar 161 and the adjacent second support bar 161'. A first sealing cavity 162 is formed between the first support bar 161 and the adjacent second support bar 161'.

[0050] The present utility model adopts a structure with two sets of sealing cavities. The second sealing cavity 163 isolates the first junction box 181 from the first sealing cavity 162, ensuring that the heat generated during the use of the first junction box 181 will not be transferred and diffused into the first sealing cavity 162, will not affect the temperature in the first sealing cavity 162, and will not damage the heat preservation performance of the photovoltaic module. The first sealing cavity, as a conventional hollow layer sealing cavity, plays roles such as isolation and heat preservation. The temperature in the first sealing cavity 162 will not affect the first junction box 181 in the second sealing cavity 163. The structure of the two sets of sealing cavities makes the heat insulation performance of the photovoltaic module better, and at the same time, the noise reduction, anti-condensation, anti-ultraviolet, and energy-saving effects are also better, and the safety is higher.

[0051] The first sealed cavity 162 and / or the second sealed cavity 163 are filled with a barrier gas. Optionally, the first sealed cavity 162 and / or the second sealed cavity 163 may include air, nitrogen, argon, vacuum, etc., which have lower heat conductivity to achieve better insulation effect.

[0052] The first support bar 161 and the second support bar 161' both include a support spacer bar 161c, a first sealant 161a and a second sealant 161b arranged at both ends of the support spacer bar 161c. The support spacer bar 161c is connected to the middle layer glass 15 and the back panel glass 17 via the first sealant 161a, and the second sealant 161b is arranged on the outside of the support spacer bar 161c.

[0053] The first sealant 161a is used to bond the upper and lower ends of the support spacer 161c to the middle layer glass 15 and the back panel glass 17 respectively, mainly to fix the support spacer 161c and ensure the low water vapor permeability of the hollow layer 16. Optionally, the first sealant uses butyl glue.

[0054] The second sealant 161b mainly seals the hollow layer 16 and isolates it from the outside. Optionally, the second sealant 161b can be made of silicone sealant, polyurethane sealant, polysulfide sealant, etc.

[0055] The support spacer 161c has a supporting function. The support spacer is preferably, but not limited to, an aluminum spacer with a built-in molecular sieve, a stainless steel spacer or a warm edge bar, etc., which mainly plays the role of isolating water vapor, absorbing water vapor in the sealed cavity in the hollow layer, and supporting the middle layer glass and the back plate glass.

[0056] The utility model does not specifically limit the number of junction box groups in the photovoltaic module, and the photovoltaic module 1 may include multiple junction box groups 18. The photovoltaic module 1 is provided with multiple first through holes 151 and multiple second through holes 171 corresponding to the multiple junction box groups 18, and the multiple junction box groups are arranged on the inner side of the corresponding first support bar 161. Usually, each photovoltaic module is equipped with a junction box group, and two adjacent photovoltaic modules are electrically connected by docking the junction box groups, or the second junction box corresponding to the photovoltaic module located at the edge is electrically connected to other loads such as an inverter and a battery.

[0057] The utility model does not have any special requirements on the shape of the through hole. The first through hole only needs to pass the bus bar led out through the first through hole to connect with the first junction box, and the cable led out of the first junction box passes through the second through hole to be electrically connected with the second junction box.

[0058] The front panel glass 15 of the photovoltaic module 1 has high transparency or certain colors. In addition to having good light transmittance and ultraviolet resistance, it also needs to provide certain mechanical strength, weather resistance such as wind resistance and hail impact resistance, and a thermal expansion coefficient that matches other encapsulation materials. Preferably, the front panel glass is made of ultra-white tempered glass.

[0059] The intermediate layer glass 15 can be made of flat glass, tempered glass, heat-strengthened glass, semi-tempered glass, enameled tempered and enameled semi-tempered glass, curved glass, laminated glass, fireproof glass, etc. Preferably, the intermediate layer glass can be made of ultra-white tempered glass or ultra-white tempered low-emissivity glass.

[0060] The backsheet material 17 of the photovoltaic module 1 is mainly glass and organic polymer materials, and its main functions include blocking air, blocking water vapor, blocking ultraviolet rays, providing electrical insulation performance, providing mechanical support performance, sand abrasion resistance, and ensuring bonding strength with encapsulation materials. The backsheet glass can be composed of a uniform material that completely increases transparency (for example, glass, transparent ethylene-vinyl acetate copolymer (EVA), etc.). The types of glass used can include tempered glass, borosilicate glass, Corning aluminosilicate glass, anti-reflection coated glass, etc. Preferably, the backsheet glass can be made of ultra-white tempered glass, ultra-white tempered low-emissivity glass, etc.

[0061] Between the front panel glass 11 and the photovoltaic cell layer 13 of the photovoltaic module 1, there is also a first adhesive film 12, and between the photovoltaic cell layer 13 and the intermediate layer glass 16, there are also a second adhesive film 14 and a third adhesive film 15.

[0062] The first adhesive film 12 and the second adhesive film 14 are respectively used to protect the fragile photovoltaic cell layer 13 from impact and for interlayer bonding. Optionally, the first adhesive film can be made of a transparent polyvinyl butyral (PVB) adhesive film, an ionomer interlayer (SGP) adhesive film, etc., and the second adhesive film is made of a transparent PVB adhesive film, an SGP adhesive film, etc. The color of the PVB adhesive film is preferably but not limited to transparent, black and other colors; as long as it is a material with electrical insulation, bonding function and light transmittance, it can be used as the first adhesive film 12 and the second adhesive film 14 of the present utility model. The first adhesive film 12 and the second adhesive film 14 are attached to the upper and lower sides of the photovoltaic cell layer 13, which not only protects the photovoltaic cell layer 13 from the influence of the external environment such as moisture penetration, but also has a buffering function to prevent damage. That is to say, the first adhesive film 12 is laminated on the upper part of the photovoltaic cell layer 13 to protect the photovoltaic cell layer 13, and the second adhesive film 14 is laminated on the lower part of the photovoltaic cell layer 13 to protect the photovoltaic cell layer 13.

[0063] The following specifically introduces the assembly process of the photovoltaic module of the present utility model, which includes the following specific steps:

[0064] Lay the front panel glass 11 flat, and lay the first adhesive film 12 on the front panel glass 11. The length and width of the first adhesive film are 1 mm to 10 mm longer than those of the front panel glass;

[0065] Place the photovoltaic cell layer 13 in the center on the first adhesive film 12;

[0066] Place the perforated second adhesive film 14 on the photovoltaic cell layer 13, and the bus bar 131 passes through the hole in the second adhesive film 14. The hole diameter is 8 to 15 mm;

[0067] Place the intermediate layer glass 15 with the first through hole 151 on the second adhesive film 14. The bus bar 131 passes through the first through hole 151 to obtain the first component. The diameter of the first through hole is equivalent to the hole diameter of the second adhesive film 14;

[0068] Put the first component into a laminator for lamination. Among them, a double-sided heating laminator is used. The temperature of the upper and lower chambers is set at 125 to 160 °C, the vacuum pumping time is set at 20 to 40 min, the pressure in the first stage is set at -90 to -75 KPa, the time is set at 5 to 300 s, the pressure in the second stage is set at -85 to -55 Kpa, the time is set at 10 to 500 s, and the pressure in the third stage is set at -75 to -20 KPa, and the time is set at 20 to 800 s;

[0069] Cool the laminated first component to room temperature and then put it into an autoclave for secondary encapsulation to obtain the second component. Among them, the temperature in the autoclave is set at 130 to 150 °C, the pressure is set at 0.2 to 1.3 MPa, and the heat preservation and pressure holding time is set at 30 to 100 min;

[0070] Trim the four sides of the second component, install the first junction box 181, fill with glue and cure, and test the electrical performance. Among them, the first junction box 181 is installed at the first through hole 151 on the intermediate layer glass 15 and connected to the bus bar 131, and the first through hole 151 is sealed;

[0071] Clean the second component installed with the first junction box to keep the exposed surface of the intermediate layer glass clean;

[0072] Place the support spacer 161c (filled with molecular sieve) with the first layer of sealant 161a applied to both ends on the intermediate layer glass 15 of the component after the eighth step of cleaning. Among them, a second sealant 161b is also applied to the side of the support spacer 161c adjacent to the first junction box 181 facing away from the first junction box 181;

[0073] Stack the back panel glass 17 with the second through hole 171 on the support spacer 161c of the component completed in the ninth step, and then assemble the pieces to obtain the initial photovoltaic module. The air pressure is set at 0.5 to 0.8 MPa, and the lamination difference is not more than 3 mm;

[0074] The periphery of the initial photovoltaic module is potted with the second sealant, the curing temperature is set at 20-30 °C, the humidity is not less than 50%, and the time is set at 4-24 h;

[0075] The second junction box 182 is installed on the cured initial photovoltaic module, potted and cured, and the electrical performance is tested for the second time. Among them, the second junction box 182 is connected to the first junction box 181 through a cable, and the second junction box 182 is installed at the second through hole 171 on the backplane glass 17, and the second through hole 171 is sealed to obtain the photovoltaic module.

[0076] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that the present invention includes but is not limited to the content described in the drawings and the above specific implementation manner. Any modification that does not deviate from the functional and structural principles of the present invention will be included in the scope of the claims.

Claims

1. A photovoltaic module, comprising: A front glass panel (11), a photovoltaic cell layer (13), an intermediate glass layer (15) and a back glass panel (17) are stacked, a hollow layer (16) is formed between the intermediate glass layer (15) and the back glass panel (17), characterized in that the photovoltaic module (1) also includes at least one junction box group (18), the junction box group (18) includes a first junction box (181) and a second junction box (182), the first junction box (181) corresponds to the second junction box (182), the first junction box (181) is fixed to a side of the intermediate glass layer (15) adjacent to the hollow layer (16), the first junction box (181) is electrically connected to a bus bar (131); the second junction box (182) is fixed to a side of the back glass panel (17) away from the hollow layer (16), the second junction box (182) is electrically connected to the first junction box (181), and the second junction box (182) is also used to be electrically connected to a load.

2. The photovoltaic module according to claim 1, characterized in that: The photovoltaic module is provided with at least one first through hole (151) and at least one second through hole (171); the first through hole (151) is located on the middle layer glass (15) and penetrates the middle layer glass (15); the second through hole (171) is located on the back plate glass (17) and penetrates the back plate glass (17); the first through hole (151) corresponds to the second through hole (171) one by one, and the junction box group (18) corresponds to the first through hole (151); the first junction box (181) is electrically connected to the bus bar (131) through the corresponding first through hole (151); and the second junction box (182) is electrically connected to the first junction box (181) through the corresponding second through hole (171).

3. The photovoltaic module according to claim 2, characterized in that: The first junction box (181) covers the first through hole (151), and the opening of the first through hole (151) is closed by the first junction box (181); the second junction box (182) covers the second through hole (171), and the opening of the second through hole (171) is closed by the second junction box (182).

4. The photovoltaic module according to claim 3, characterized in that: The photovoltaic assembly (1) further comprises at least one group of first support bars (161), at least one of the junction box groups corresponds to the first support bar (161), the first support bar (161) is arranged in the hollow layer (16), and is connected between the middle layer glass (15) and the back plate glass (17), and there is a set distance between the first support bar (161) and the junction box group (18), and the set distance is greater than 5 mm.

5. The photovoltaic module according to claim 4, characterized in that: The photovoltaic module (1) further comprises at least one group of second support bars (161'), wherein the first support bars (161) are correspondingly arranged on the inner side of the second support bars (161'), and the second support bars (161') are arranged at the edge of the hollow layer (16) and connect the intermediate layer glass (15) and the back panel glass (17).

6. The photovoltaic module according to claim 5, characterized in that: There is a gap between the first support bar (161) and the adjacent second support bar (161'), and a first sealed cavity (162) is formed between the first support bar (161) and the adjacent second support bar (161'); the intermediate layer glass (15), the first support bar (161) adjacent to the first junction box (181), and the back panel glass form a second sealed cavity (163), and the first junction box (181) is located in the second sealed cavity (163).

7. The photovoltaic module according to claim 5, characterized in that: The first support bar (161) and the second support bar (161') respectively include a support spacer bar (161c), a first sealant (161a) and a second sealant (161b) arranged at both ends of the support spacer bar (161c); the support spacer bar (161c) is connected to the intermediate layer glass and the back panel glass via the first sealant (161a) at both ends; the second sealant (161b) is arranged on the outer side of the support spacer bar (161c).

8. The photovoltaic module according to claim 6, characterized in that: The first sealed cavity (162) and / or the second sealed cavity (163) is filled with a barrier gas.

9. The photovoltaic module according to claim 5, characterized in that: The photovoltaic assembly comprises a plurality of junction box groups, and the plurality of junction box groups are arranged on the inner side of the corresponding first support bar (161).

10. The photovoltaic module according to any one of claims 1 to 9, characterized in that: The first junction box includes a split junction box and / or an integrated junction box; and / or the second junction box includes a split junction box and / or an integrated junction box.

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