A photovoltaic junction box

Abstract

The present invention discloses a photovoltaic junction box, comprising a junction box body, at least two connecting wires electrically connected to a diode device of the junction box body, and a busbar extension device connected to the other end of the connecting wire. The busbar extension device comprises a busbar sealing device and a busbar fixing device arranged in the busbar sealing device and connected to the connecting wire. The space between the busbar sealing device and the busbar fixing device constitutes an insertion interface. The busbar of the photovoltaic module is inserted into the insertion interface. The busbar sealing device is fixed to the photovoltaic module by a sealant. The contact area between the busbar sealing device and the photovoltaic module is 15-70mm. 2 The junction box body is located outside the photovoltaic module. This changes the situation where the junction box blocks the photovoltaic module, facilitates the maintenance and replacement of the junction box, and is beneficial to the heat dissipation of the photovoltaic module and the junction box, thereby increasing the power of the photovoltaic module.

Description

Technical Field

[0001] The present invention relates to the technical field of photovoltaic components, and in particular to a photovoltaic junction box. Background Art

[0002] Solar photovoltaic power generation is a renewable energy technology with the most promising sustainable development potential and is increasingly being utilized in everyday life. Currently, many high-power bifacial photovoltaic modules have emerged. These modules utilize junction boxes similar to those used for monofacial modules. Both integrated and split junction boxes are bonded to the module using silicone. The large size of the box not only obstructs the module, reducing its efficiency, but also limits the number of cells in shingled modules with narrower cells, wastes packaging material, and reduces the utilization of backsheets and glass. Furthermore, the large base area of ​​the currently used junction boxes significantly impacts module heat dissipation. Furthermore, the junction boxes contain diodes, which generate temperatures of around 150°C during startup, with some diodes reaching temperatures of up to 200°C. In severe cases, these diodes can burn out and damage the module. Current junction boxes typically use soldering to connect the busbars leading from the module to the junction box. Once the junction box is damaged, it cannot be replaced, rendering the entire module unusable, resulting in significant waste. This is inconsistent with the current development trend of increasingly sophisticated and convenient technological products. Photovoltaic modules are in urgent need of a convenient, practical and easy-to-operate junction box. Summary of the Invention

[0003] The purpose of the present invention is to provide a photovoltaic junction box, which is located outside the photovoltaic module, changing the current situation where the junction box blocks the photovoltaic module, facilitating the maintenance and replacement of the junction box, and at the same time facilitating the heat dissipation of the photovoltaic module and the junction box, thereby increasing the power of the photovoltaic module.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0005] A photovoltaic junction box comprises a junction box body, at least two connecting wires electrically connected to a diode device of the junction box body, and a busbar extension device connected to the other end of the connecting wire, the busbar extension device comprising a busbar sealing device and a busbar fixing device disposed within the busbar sealing device and connected to the connecting wire, the space between the busbar sealing device and the busbar fixing device constituting an insertion interface, the busbar of a photovoltaic module being inserted into the insertion interface, the busbar sealing device being fixed to the photovoltaic module by a sealant, and the contact area between the busbar sealing device and the photovoltaic module being 15-70 mm 2 , the junction box body is located outside the photovoltaic assembly.

[0006] Preferably, the contact surface between the busbar sealing device and the photovoltaic module is a rectangle with a side length of 8-12 mm.

[0007] Preferably, the busbar sealing device includes a box and a cover matching the box, the box and the busbar fixing device are cast, the cover and the end of the connecting wire are cast, and the connecting wire is in contact and connected with the busbar fixing device.

[0008] Preferably, the edge of the box has a first sealing ring, and the box and the lid are sealed via the first sealing ring.

[0009] Preferably, the side surface of the busbar fixing device is an arc surface capable of contacting and cooperating with the busbar.

[0010] Preferably, the number of the busbars is equal to the number of the busbar fixing devices, a plurality of the busbar fixing devices are arranged in one busbar sealing device, and adjacent busbar fixing devices are separated by insulating plastic.

[0011] Preferably, the number of the bus bars is equal to the number of the bus bar fixing devices, and each of the bus bar fixing devices is provided in one of the bus bar sealing devices.

[0012] Preferably, the junction box body comprises a box body and a box cover matched with the box body, the edge of the box body has a second sealing ring, and the box cover is sealed and connected to the box body through the second sealing ring.

[0013] Preferably, the diode device in the box body includes a metal sheet and a diode, and the metal sheet is a copper sheet or a copper alloy.

[0014] The photovoltaic junction box provided by the present invention includes a junction box body, a connecting wire and a busbar extension device. The junction box body includes a box body, a box cover, male and female plugs and a diode device arranged in the box body. The junction box body is a common component on the market. The number of connecting wires is at least two, and the specific number is greater than or equal to the number of busbars. One end of the connecting wire is electrically connected to the diode device in the junction box body, and the other end of the connecting wire is electrically connected to the busbar extension device. The connecting wire electrically connects the junction box body and the busbar extension device. The busbar extension device includes a busbar sealing device and a busbar fixing device. The busbar fixing device is arranged in the busbar sealing device. There is a space between the busbar sealing device and the busbar fixing device, forming an insertion port, and the insertion port extends to the bottom of the busbar sealing device. The busbar fixing device is a conductive part, the busbar fixing device is connected to the connecting wire, the busbar of the photovoltaic module is inserted into the insertion port and pinched with a clamp to complete the fixation of the busbar. The busbar of the photovoltaic module is connected to the busbar fixing device, so that the busbar of the photovoltaic module and the junction box body are connected through the busbar extension device, which facilitates the maintenance and replacement of the junction box body and will not cause damage to the photovoltaic module when the junction box body is disassembled.

[0015] While the busbar of the photovoltaic module is connected to the busbar fixing device, the busbar sealing device is fixed to the photovoltaic module and fixed with sealant, which is relatively firm. The busbar sealing device is bonded to the photovoltaic module with sealant to prevent moisture from intruding. The junction box body is located outside the photovoltaic module. The junction box body is not fixed thereto with sealant. The junction box body does not contact the photovoltaic module and does not block the photovoltaic module, thereby increasing the power of the photovoltaic module. It is beneficial to the heat dissipation of the photovoltaic module and increases the life of the photovoltaic module. It will not affect the photovoltaic module and is convenient for the heat dissipation of the junction box body. The busbar sealing device is much smaller than the junction box body. In other words, the contact area between the busbar sealing device and the photovoltaic module is very small. The contact area between the busbar sealing device and the photovoltaic module is approximately 15-70mm. 2 Compared with traditional junction boxes, the amount of sealant required for bonding to photovoltaic modules is greatly reduced, reducing the overall cost of photovoltaic modules; the busbar sealing device is basically the same size as the busbar and will not block the photovoltaic modules.

[0016] By applying the technical solution provided in the embodiment of the present invention, the junction box body is located outside the photovoltaic module, and the junction box body will not block the back of the double-sided photovoltaic module, eliminating the hot spot effect on the back of the photovoltaic module, changing the current situation of the junction box blocking the photovoltaic module, facilitating the maintenance and replacement of the junction box, and at the same time benefiting the heat dissipation of the photovoltaic module and the junction box, thereby increasing the power of the photovoltaic module. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 This is a schematic structural diagram of a photovoltaic junction box provided in a specific embodiment of the present invention;

[0019] Figure 2 It is a structural diagram of the junction box body;

[0020] Figure 3 This is a structural diagram of the busbar extension device.

[0021] The following are marked in the accompanying drawings:

[0022] Junction box body 1, connecting wire 2, busbar extension device 3, box body 11, diode device 12, second sealing ring 13, male and female plugs 14, box 31, busbar fixing device 32, first sealing ring 33, diode 121, metal sheet 122. DETAILED DESCRIPTION

[0023] The core of the present invention is to provide a photovoltaic junction box, which is located outside the photovoltaic module, changing the current situation where the junction box blocks the photovoltaic module, facilitating the maintenance and replacement of the junction box, and at the same time facilitating the heat dissipation of the photovoltaic module and the junction box, thereby increasing the power of the photovoltaic module.

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] Please refer to Figures 1 to 3 , Figure 1 This is a schematic structural diagram of a photovoltaic junction box provided in a specific embodiment of the present invention; Figure 2 It is a structural diagram of the junction box body; Figure 3 This is a structural diagram of the busbar extension device.

[0026] In a specific embodiment, the photovoltaic junction box provided by the present invention includes a junction box body 1, at least two connecting wires 2 electrically connected to the diode device 12 of the junction box body 1, and a busbar extension device 3 connected to the other end of the connecting wire 2. The busbar extension device 3 includes a busbar sealing device and a busbar fixing device 32 arranged in the busbar sealing device and connected to the connecting wire 2. The space between the busbar sealing device and the busbar fixing device 32 constitutes an insertion interface. The busbar of the photovoltaic module is inserted into the insertion interface. The busbar sealing device is fixed to the photovoltaic module by a sealant. The contact area between the busbar sealing device and the photovoltaic module is 15-70mm. 2 , the junction box body 1 is located outside the photovoltaic module.

[0027] In the above structure, the photovoltaic junction box includes a junction box body 1, a connecting wire 2 and a busbar extension device 3. The junction box body 1 includes a box body 11, a box cover, male and female plugs 14 and a diode device 12 arranged in the box body 11. The junction box body 1 is a common component on the market.

[0028] There are at least two connecting wires 2, and the specific number is greater than or equal to the number of busbars. One end of the connecting wire 2 is electrically connected to the diode device 12 in the junction box body 1, and the other end of the connecting wire 2 is electrically connected to the busbar extension device 3. The connecting wire 2 electrically connects the junction box body 1 and the busbar extension device 3.

[0029] The busbar extension device 3 includes a busbar sealing device and a busbar fixing device 32. The busbar fixing device 32 is disposed within the busbar sealing device. A space is defined between the busbar sealing device and the busbar fixing device 32, forming a plug-in interface. The plug-in interface extends to the bottom of the busbar sealing device. The busbar fixing device 32 is a conductive member that is connected to the connecting wire 2. The busbar of the photovoltaic module is inserted into the plug-in interface and clamped with a clamp to secure the busbar. The busbar of the photovoltaic module is electrically connected to the busbar fixing device 32, thereby connecting the busbar of the photovoltaic module to the junction box body 1 through the busbar extension device 3. This facilitates the maintenance and replacement of the junction box body 1 and prevents damage to the photovoltaic module when the junction box body 1 is disassembled.

[0030] The above-mentioned busbar sealing device is fixed to the photovoltaic module by sealant, which means that while the busbar of the photovoltaic module is connected and conductive to the busbar fixing device 32, the busbar sealing device is fixed to the photovoltaic module and fixed by sealant, which is relatively firm; and the busbar sealing device is bonded to the photovoltaic module by sealant to prevent moisture intrusion.

[0031] At the same time, the junction box body 1 is located outside the photovoltaic module, the junction box body 1 is not fixed thereto by sealant, the junction box body 1 does not contact the photovoltaic module, does not block the photovoltaic module, thereby increasing the power of the photovoltaic module; is beneficial to the heat dissipation of the photovoltaic module and increases the life of the photovoltaic module; does not affect the photovoltaic module and facilitates the heat dissipation of the junction box body 1.

[0032] It should be noted that the busbar sealing device is much smaller than the junction box body 1. In other words, the contact area between the busbar sealing device and the photovoltaic module is very small, and the contact area between the busbar sealing device and the photovoltaic module is about 15-70mm. 2 For split junction boxes, each busbar sealing device corresponds to 2 busbars, and the required area is approximately 15mm 2 For integrated junction boxes, each sealing device corresponds to 4 busbars, with an area of ​​approximately 60-70mm 2 .

[0033] Compared with traditional junction boxes, the amount of sealant required for bonding to photovoltaic modules is greatly reduced, reducing the overall cost of photovoltaic modules; the busbar sealing device is basically the same size as the busbar and will not block the photovoltaic modules.

[0034] By applying the technical solution provided in the embodiment of the present invention, the junction box body 1 is located outside the photovoltaic module. The junction box body 1 will not block the back of the double-sided photovoltaic module, eliminating the hot spot effect on the back of the photovoltaic module, changing the current situation of the junction box blocking the photovoltaic module, facilitating the maintenance and replacement of the junction box, and at the same time benefiting the heat dissipation of the photovoltaic module and the junction box, thereby increasing the power of the photovoltaic module.

[0035] Based on the above specific implementation methods, the contact surface between the busbar sealing device and the photovoltaic module is a rectangle with a side length of 8-12mm. For example, the size of the busbar sealing device box 11 is about 10*8mm, and the contact surface is relatively flat, which is convenient for bonding; the busbar sealing device is small in size, that is, the contact surface with the photovoltaic module is small, and the amount of sealant required for bonding to the photovoltaic module is greatly reduced, thereby reducing the overall cost, facilitating heat dissipation of the photovoltaic module and the junction box, and increasing the power of the photovoltaic module.

[0036] In the photovoltaic junction box provided by the present invention, with other components unchanged, the busbar sealing device includes a box 31 and a lid. The lid cooperates with the box 31. The box 31 and the busbar fixture 32 are cast and formed, leaving only the insertion interface. This ensures a reliable connection, a relatively secure fixation of the busbar fixture 32, and a resistance to loosening of the busbar fixture 32. The lid and the end of the connecting wire 2 are cast and formed, and the end of the connecting wire 2 extends out of the lid. When the lid is placed on the box 31, the connecting wire 2 and the busbar fixture 32 are in contact and connected, eliminating the need to separately connect the connecting wire 2 and the busbar fixture 32. This not only simplifies the connection process, but also ensures a stable and reliable connection between the connecting wire 2 and the busbar fixture 32.

[0037] To further optimize the above technical solution, the edge of the box 31 is provided with a first sealing ring 33 , and the box 31 and the lid are sealed via the first sealing ring 33 , which has good sealing performance, does not require glue filling, and saves costs.

[0038] For the photovoltaic junction boxes in each of the above embodiments, the side of the busbar fixing device 32 is an arc surface, which is consistent with the arc surface of the busbar. The side of the busbar fixing device 32 is in contact with the side of the busbar. The connection between the busbar fixing device 32 and the busbar is more reliable and not prone to poor contact or disconnection.

[0039] In the photovoltaic junction box provided by the present invention, when other components remain unchanged, the number of busbars is equal to the number of busbar fixing devices 32, and multiple busbar fixing devices 32 are arranged in a busbar sealing device, and adjacent busbar fixing devices 32 are separated by insulating plastic. In other words, the busbar sealing device contains multiple busbar fixing devices 32, and the multiple busbar fixing devices 32 are separated by insulating plastic. Each busbar fixing device 32 is independent, and each busbar fixing device 32 is connected to a busbar. In this case, multiple busbar fixing devices 32 share a busbar sealing device, which does not affect the normal use of each busbar fixing device 32. It is sufficient to fix a busbar sealing device to the photovoltaic module, which not only simplifies the overall structure of the busbar extension device 3, but also simplifies the connection process and saves time.

[0040] In another more reliable embodiment, the number of bus bars is equal to the number of bus bar fixing devices 32, each bus bar fixing device 32 is arranged in a bus bar sealing device, the bus bar fixing device 32 corresponds to the bus bar sealing device one by one, and the bus bar fixing device 32 and the bus bar sealing device constitute a set of bus bar extension devices 3. When one of the multiple bus bar extension devices 3 fails, only the faulty bus bar extension device 3 needs to be replaced, which facilitates maintenance and replacement and reduces costs.

[0041] The photovoltaic junction box provided by the present invention, when other components remain unchanged, the junction box body 1 includes a box body 11 and a box cover that cooperates with the box body 11, the edge of the box body 11 has a second sealing ring 13, and the box cover and the box body 11 are sealed and connected through the second sealing ring 13, with good sealing performance, no need for glue filling, and cost saving.

[0042] To further optimize the above technical solution, the diode device 12 in the box body 11 includes a metal sheet 122 and a diode 121. The metal sheet 122 is a copper sheet or a copper alloy with good conductivity.

[0043] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0044] The photovoltaic junction box provided by the present invention is introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core ideas of the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A photovoltaic junction box, characterized in that: The invention comprises a junction box body (1), at least two connecting wires (2) electrically connected to a diode device (12) of the junction box body (1), and a busbar extension device (3) connected to the other end of the connecting wire (2), wherein the busbar extension device (3) comprises a busbar sealing device and a busbar fixing device (32) arranged in the busbar sealing device and connected to the connecting wire (2), wherein the busbar fixing device (32) is a conductive member, the busbar fixing device (32) is connected to the connecting wire (2), and the space between the busbar sealing device and the busbar fixing device (32) constitutes an insertion interface, wherein the busbar of the photovoltaic module is inserted into the insertion interface, and the busbar of the photovoltaic module is electrically connected to the busbar fixing device (32), thereby connecting the busbar of the photovoltaic module and the junction box body (1) through the busbar extension device (3). The busbar sealing device is fixed to the photovoltaic module by sealant, and the contact area between the busbar sealing device and the photovoltaic module is 15-70mm 2 , the junction box body (1) is located outside the photovoltaic assembly.

2. The photovoltaic junction box according to claim 1, characterized in that: The contact surface between the busbar sealing device and the photovoltaic module is a rectangle with a side length of 8-12 mm.

3. The photovoltaic junction box according to claim 1, characterized in that: The busbar sealing device comprises a box (31) and a cover matched with the box (31); the box (31) and the busbar fixing device (32) are cast and formed; the cover and the end of the connecting wire (2) are cast and formed; the connecting wire (2) is in contact and connected with the busbar fixing device (32).

4. The photovoltaic junction box according to claim 3, characterized in that: The edge of the box (31) is provided with a first sealing ring (33), and the box (31) and the cover are sealed via the first sealing ring (33).

5. The photovoltaic junction box according to claim 1, characterized in that: The side surface of the busbar fixing device (32) is an arc surface capable of contacting and cooperating with the busbar.

6. The photovoltaic junction box according to claim 1, characterized in that: The number of the busbars is equal to the number of the busbar fixing devices (32); a plurality of the busbar fixing devices (32) are arranged in one busbar sealing device; adjacent busbar fixing devices (32) are separated by insulating plastic.

7. The photovoltaic junction box according to claim 1, characterized in that: The number of the bus bars is equal to the number of the bus bar fixing devices (32), and each of the bus bar fixing devices (32) is arranged in one of the bus bar sealing devices.

8. The photovoltaic junction box according to claim 1, characterized in that: The junction box body (1) comprises a box body (11) and a box cover matched with the box body (11); the edge of the box body (11) has a second sealing ring (13); the box cover and the box body (11) are sealed via the second sealing ring (13).

9. The photovoltaic junction box according to claim 8, characterized in that: The diode device (12) in the box body (11) comprises a metal sheet (122) and a diode (121), wherein the metal sheet (122) is a copper sheet.

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