Photovoltaic power generation assembly junction box, junction box system and photovoltaic power generation system

Abstract

The utility model relates to a photovoltaic power generation assembly junction box, a junction box system and a photovoltaic power generation system, a rapid turn-off device is fixedly installed on a box cover, and two ends of the rapid turn-off device are provided with a first positive electrode interface, a second positive electrode interface, a first negative electrode interface and a second negative electrode interface; the diode, the third positive electrode interface, the third negative electrode interface and the load interface are fixedly arranged on the box base; and the box cover and the box base are detachably mounted into a whole. The junction box is designed into the box cover and the box body, the electronic element with long service life is fixedly arranged on the box base, and the electronic element with short service life is fixed on the box cover, so that when the electronic element with short service life is damaged, only the electronic element with short service life and the box cover need to be replaced, and the box base is kept immobile; therefore, the waste is reduced, the workload of replacing the junction box is saved, the use cost of the photovoltaic power generation system is reduced, and the power generation efficiency of the photovoltaic power generation assembly is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaic power generation, and particularly relates to a wiring box for a photovoltaic power generation component, a wiring box system and a photovoltaic power generation system. Background Art

[0002] Photovoltaic power generation is to convert solar energy into electric energy by using photovoltaic power generation components. During the power generation process, no pollution is emitted, which is green and environmentally friendly. Therefore, the popularity rate of photovoltaic power generation systems composed of photovoltaic power generation components is getting higher and higher. In a photovoltaic power generation system, a wiring box is used to transmit the electric energy generated by the photovoltaic power generation components to an external power grid or a load. The wiring box includes components such as a box body, a diode and positive / negative connection interfaces, and is usually an integrated structure. Among them, components such as a quick shutdown device, a diode and positive and negative connection interfaces are all fixedly installed on the box body. In the prior art, the service life of photovoltaic power generation components is usually more than 25 years, and the service life of components such as diodes and positive and negative interfaces in the wiring box is usually also more than 25 years, while the service life of the quick shutdown device is generally relatively short, about 10 years. Therefore, during the life cycle of the photovoltaic power generation system, due to the short service life of the quick shutdown device, the wiring box needs to be replaced multiple times to enable the photovoltaic power generation system to generate electricity normally and safely.

[0003] In the prior art, since the wiring box is usually an integrated structure, when the quick shutdown device is damaged and the wiring box needs to be replaced, components such as diodes and positive and negative interfaces in the wiring box that can be used normally have to be replaced together with the box body, which increases the processes such as drilling and gluing required when replacing the box body, increases the engineering quantity and material consumption cost, and reduces the power generation efficiency of the photovoltaic power generation system. Summary of the Utility Model

[0004] To solve the above technical problems, the utility model provides a wiring box for a photovoltaic power generation component, which solves the problems of waste of electronic components, high use cost of photovoltaic power generation and low power generation efficiency of the photovoltaic power generation system when replacing the wiring box.

[0005] In a first aspect, to achieve the above object, the utility model provides a wiring box for a photovoltaic power generation component, including a box cover, a box base, a quick shutdown device, a diode and a load interface. Among them, the quick shutdown device is fixedly installed on the box cover, and first positive interface, second positive interface, first negative interface and second negative interface are arranged at both ends of the quick shutdown device;

[0006] The diode and the load interface are fixedly installed on the box base. A third positive interface and a third negative interface are further arranged on the box base. First pad and second pad are fixedly connected to both ends of the diode;

[0007] The load interface includes a fourth positive interface and a fourth negative interface;

[0008] The lid and the base of the box are detachably connected. The first positive interface is electrically connected to the third positive interface, the first negative interface is electrically connected to the third negative interface, the second positive interface is electrically connected to the fourth positive interface, and the second negative interface is electrically connected to the fourth negative interface.

[0009] Preferably, a groove is provided at the opening edge of the lid, and a convex block matching the groove on the lid is provided on the opening edge of the base of the box.

[0010] The lid is snap-fitted to the convex block at the opening edge of the base of the box through the groove.

[0011] Preferably, a number of clamping posts are fixedly provided on the lid, and a number of clamping grooves matching the clamping posts are fixedly provided on the base of the box.

[0012] The number of clamping posts on the lid is snap-fitted to the number of clamping grooves on the base of the box in one-to-one correspondence.

[0013] Preferably, an alarm lamp is provided on the lid, and the alarm lamp is electrically connected to the fast shutdown device.

[0014] Preferably, a reflective heat-insulating coating is provided on the outer surface of the lid and / or the base of the box.

[0015] Preferably, the connection ends of the first positive interface, the second positive interface, the first negative interface, and the second negative interface are provided in a convex arc shape, a corrugated shape, or a curved surface shape.

[0016] In a second aspect, to achieve the above object, the present application further provides: including a first wire box, a second wire box, a first output terminal, a second output terminal, and a junction box, and the junction box is the junction box described in any one of the above technical solutions.

[0017] The first wire box is connected to the third positive interface, and the second wire box is connected to the third negative interface.

[0018] The fourth positive interface is connected to the first output terminal, and the fourth negative interface is connected to the second output terminal.

[0019] In a third aspect, to achieve the above object, the present application further provides a photovoltaic power generation system, including a photovoltaic power generation component and the junction box described in any one of the above technical solutions, and the photovoltaic power generation component is connected to the junction box.

[0020] The junction box provided by the present utility model fixes and installs electronic components with a long service life on the box base, and fixes electronic components with a short service life to the box cover. When the electronic components with a short service life are damaged, only the electronic components with a short service life and the box cover need to be replaced, and the box base is kept fixed, thereby reducing waste, saving the workload of replacing the junction box, reducing the use cost of the photovoltaic power generation system, and improving the power generation efficiency of the photovoltaic power generation system. Description of the Drawings

[0021] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0022] Figure 1 It is a schematic diagram of the overall structure of the photovoltaic power generation component junction box in the embodiment of the present utility model;

[0023] Figure 2 It is a schematic diagram of the box base structure of the photovoltaic power generation component junction box in the embodiment of the present utility model;

[0024] Figure 3 It is a schematic diagram of the box cover structure of the photovoltaic power generation component junction box in the embodiment of the present utility model;

[0025] Description of the reference numerals:

[0026] 10. Junction box; 101. Box cover; 102. Box base; 103. Quick shutdown device; 201. Third positive interface; 202. First pad; 203. Diode; 204. Second pad; 205. Third negative interface; 206. Fourth negative interface; 207. Fourth positive interface; 208. First positive interface; 209. First negative interface; 210. Second negative interface; 211. Second positive interface. Detailed Embodiments

[0027] The following will clearly and completely describe the technical solutions of the present utility model in conjunction with the drawings. Obviously, the described embodiments are some embodiments of the present utility model, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts belong to the scope of protection of the present utility model.

[0028] In addition, the technical features involved in different embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0029] In view of the drawback that in the process of replacing the junction box of the current photovoltaic power generation system, the normally usable electronic components in the junction box and the damaged electronic components are replaced together, the present utility model provides a photovoltaic power generation component junction box. By designing the junction box into a matching box cover and a box base, the box cover and the box base can be detachably installed together, and the box body of the junction box is fixedly installed on the photovoltaic power generation component. In the embodiment of the present utility model, the electronic components with a long service life are fixedly installed on the box base, and the electronic components with a short service life are fixedly installed on the box cover. When the electronic components with a short service life are damaged, only the electronic components with a short service life and the box cover need to be replaced, and the box base is kept stationary, thereby reducing waste, saving the workload of replacing the junction box, reducing the use cost of the photovoltaic power generation system, and improving the power generation efficiency of the photovoltaic power generation system.

[0030] In various embodiments of the present utility model, the photovoltaic power generation component is composed of one or several photovoltaic power generation cells.

[0031] Figure 1 It is a schematic diagram of the overall structure of the photovoltaic power generation component junction box in Embodiment 1 of the present utility model. As Figure 1 shown, the photovoltaic power generation component junction box 10 of the present utility model includes a box cover 101, a box base 102, a quick shutdown device 103, a diode 203, and a load interface. The box cover 101 and the box base 102 are snap-fitted together in a detachable manner. In practical applications, the box base 102 can be fixed on the photovoltaic power generation component. The electronic components with a short service life in the junction box are fixedly installed on the box cover 101. When the electronic components with a short service life are damaged, only the box cover and the electronic components with a short service life need to be replaced, and there is no need to replace the box base 102 and other normally usable electronic components on the box base 102 together, thereby avoiding processes such as drilling and gluing required for replacing the box base, greatly reducing the engineering quantity and material consumption, reducing the replacement cost of the junction box, and improving the power generation efficiency of the photovoltaic power generation component.

[0032] In practical applications, the service life of the quick shutdown device 103 is short. The quick shutdown device 103 can be fixedly installed on the box cover 101. When the quick shutdown device 103 is damaged, only the box cover 101 with a new quick shutdown device 103 needs to be replaced, and the box base 102 installed in the fixed position can remain stationary, and other electronic components fixedly installed on the box base 102 are also retained together. Therefore, there is no need to reinstall the box base 102, reducing the engineering quantity and material loss when replacing the box base. The load interface includes a fourth negative interface 206 and a fourth positive interface 207. The fourth negative interface 206 and the fourth positive interface 207 are fixedly installed on the box base 102. When the photovoltaic power generation component generates electricity under sunlight irradiation, the generated current is output to an external load or an external power grid through the load interface.

[0033] In this embodiment, the fast shutdown device with a short service life is installed on the box cover. When the fast shutdown device is damaged, only the box cover with a new fast shutdown device needs to be replaced, thus avoiding waste, reducing the workload of repairing the junction box, and lowering the usage cost of the photovoltaic power generation system.

[0034] Figure 2 It is a schematic structural diagram of the box base of the photovoltaic power generation component junction box in Embodiment 1 of the present utility model. As Figure 2 shown and in combination with Figure 1 , the diode 203 is fixedly installed on the box base 102. The two ends of the diode 203 are connected with a first solder pad 202 and a second solder pad 204. The first solder pad 202 and the second solder pad 204 are connected in parallel with the external photovoltaic power generation component through a bus bar. When a fault occurs in the photovoltaic power generation component or it is partially blocked or other abnormalities occur, the current generated by the abnormal photovoltaic power generation component will decrease or even stop generating electricity. The external current passes through the diode 203, thereby bypassing the photovoltaic power generation component with abnormal power generation, reducing the hot spot risk caused by factors such as shading or faults of the photovoltaic power generation component, and improving the overall power generation efficiency of the photovoltaic power generation system.

[0035] When a certain part of the photovoltaic power generation component generates little power due to being blocked or stops generating electricity due to a fault, the voltage of the photovoltaic power generation component with abnormal power generation is lower than the external voltage. The external current may enter this photovoltaic power generation component, resulting in this photovoltaic power generation component not only consuming part of the external power, but even causing this photovoltaic power generation component to be burned out due to a large external current, that is, the hot spot effect occurs.

[0036] Figure 3 It is a schematic structural diagram of the box cover of the photovoltaic power generation component junction box in Embodiment 1 of the present utility model. As Figure 3 shown, in combination with Figure 1 and Figure 2 , the fast shutdown device 103 is fixedly installed on the box cover 101. The two ends of the fast shutdown device 103 are provided with a first positive electrode interface 208, a first negative electrode interface 209, a second positive electrode interface 211 and a second negative electrode interface 210.

[0037] When the box cover 101 and the box base 102 are installed together in a detachable manner, the first positive electrode interface 208 is electrically connected to the third positive electrode interface 201; the first negative electrode interface 209 is electrically connected to the third negative electrode interface 205; the second positive electrode interface 211 is electrically connected to the fourth positive electrode interface 207; the second negative electrode interface 210 is electrically connected to the fourth negative electrode interface 206. For example, the electrical connection in this embodiment can be achieved by setting wires, metal solder joints, etc. on the box cover 101 or the box base 102.

[0038] In this embodiment, the cover 101 and the base 102 of the photovoltaic power generation component junction box are designed as two independent individuals that can be mutually matched and installed, and are assembled into a junction box in a detachable manner. In practical applications, the detachable methods include: the cover 101 and the base 102 are fastened together by screws; there are grooves on the opening edge of the cover 101, and the thickness of the opening edge of the base 102 matches the grooves, so as to fasten the cover 101 and the base 102 together, etc. After the cover 101 and the base 102 are assembled into a junction box in a detachable manner and connected to the photovoltaic power generation component, when the fast shutdown device in the cover 101 fails, only the cover 101 with the fast shutdown device 103 needs to be replaced, without the need to replace the base 102, thus avoiding waste and reducing the use cost of the photovoltaic power generation system. Similarly, if only the electronic components in the base 102 fail, only the base 102 can be replaced without the need to replace the cover 101, so as to reduce the use cost of the photovoltaic power generation system and improve the power generation efficiency.

[0039] In specific applications, bumps or ridges can be provided at the opening edge position of the cover 101, and the bumps or ridges on the opening edge of the base 102 match the grooves on the cover 101; the junction box and the base are connected through the formation of a snap connection by the grooves on the cover 101 and the bumps or ridges on the opening edge of the base 102, preventing external moisture or dust from entering the interior of the junction box and ensuring a dry and clean environment inside the junction box.

[0040] In specific applications, 1-6 clamping posts can be fixedly provided on the cover 101, and 1-6 clamping grooves matching the clamping posts are fixedly provided on the base 102; the clamping posts of the cover 101 are snap-connected with the clamping grooves on the base 102.

[0041] Specifically, an alarm lamp can also be provided on the cover. The alarm lamp is connected to the fast shutdown device 103. When the photovoltaic power generation component generates electricity normally, it can emit a certain color of light, such as green light; when an abnormal current passes through the diode in the photovoltaic power generation component, it can emit another color of light, such as blue light; when the photovoltaic power generation component does not generate electricity or the fast shutdown device 103 is damaged, the alarm lamp does not emit light, so that users can more clearly understand the power generation situation of the photovoltaic power generation component.

[0042] In specific applications, a layer of reflective heat-insulating material can also be coated on the outer surface of the cover 101 and / or the base 102 to avoid the situation that the internal temperature of the junction box is too high under sunlight irradiation and extend the service life of each electronic component inside the junction box.

[0043] In a specific application, the four electrode interfaces fixedly installed on the box cover 101 are the first positive electrode interface 208, the first negative electrode interface 209, the second negative electrode interface 210, and the second positive electrode interface 211. The connection ends of the above four electrodes can be non-planar shapes such as convex arc-shaped, corrugated, or curved surface-shaped. When the box cover 101 is buckled with the box base 102, the non-planar shapes at the connection ends of the four electrode interfaces on the box cover can achieve closer and firmer contact when respectively connected to the corresponding electrode interfaces on the box base 102, so as to obtain a stable electrical connection in the junction box.

[0044] In a specific application, the second negative electrode interface 210 and the second positive electrode interface 211 can be used to connect an external load or an external power grid, so that the fourth negative electrode interface 206 and the fourth positive electrode interface 207 on the box base 102 can be removed, thereby further reducing the manufacturing cost of the box base 102.

[0045] The present utility model further provides a photovoltaic power generation component junction box system, including a first side junction box, a second side junction box, a first output terminal, a second output terminal, and a junction box (10). The junction box (10) is set as the junction box (10) described in any one of the above embodiments; the first side junction box is connected to the third positive electrode interface (201), and the second side junction box is connected to the third negative electrode interface (205); the fourth positive electrode interface (207) is connected to the first output terminal, and the fourth negative electrode interface (206) is connected to the second output terminal.

[0046] Compared with the prior art where there are often 6 or more output terminals, the photovoltaic power generation component junction box system in this embodiment only has two output terminals: the first output terminal and the second output terminal; this not only reduces the probability of failures of the output terminals, improves the safety and stability of the circuit, but also reduces the manufacturing cost of the photovoltaic power generation component junction box system and improves the efficiency of the photovoltaic power generation component during the power generation process.

[0047] The present utility model further provides a photovoltaic power generation system, including a photovoltaic power generation component and any one of the junction boxes in the above embodiments. The box base 102 of the junction box can be fixedly installed on the photovoltaic power generation component. For example, the box base 102 can be fixedly installed on the photovoltaic power generation component by means of pasting, clamping, etc.

[0048] Furthermore, the junction box in this embodiment can also be disposed in a junction box system, and the junction box system is then connected to the photovoltaic power generation component.

[0049] Obviously, the above embodiments are merely examples for clear illustration and not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. And the obvious changes or variations derived therefrom still fall within the protection scope of the creation of the present utility model.

Claims

1. A photovoltaic power generation assembly junction box, characterized in that: It comprises a box cover (101), a box base (102), a fast shut-off device (103), a diode (203), and a load interface, wherein: The quick shut-off device (103) is fixedly mounted on the box cover (101), and two ends of the quick shut-off device (103) are provided with a first positive electrode interface (208), a second positive electrode interface, a first negative electrode interface (209), and a second negative electrode interface (210); The diode (203) and the load interface are fixedly mounted on the box base (102); a third positive electrode interface (201) and a third negative electrode interface (205) are also provided on the box base (102); and a first welding pad (202) and a second welding pad (204) are fixedly connected at both ends of the diode (203); The load interface comprises a fourth positive electrode interface (207) and a fourth negative electrode interface (206); The box cover (101) and the box base (102) are configured to be detachably connected, the first positive electrode interface (208) is electrically connected to the third positive electrode interface (201), the first negative electrode interface (209) is electrically connected to the third negative electrode interface (205), the second positive electrode interface is electrically connected to the fourth positive electrode interface (207), and the second negative electrode interface (210) is electrically connected to the fourth negative electrode interface (206).

2. The junction box according to claim 1, characterized in that: The opening edge of the box cover (101) is provided with a groove, and the opening edge of the box base (102) is provided with a protrusion that matches the groove on the box cover (101); The box cover (101) is snap-connected with the protrusion on the opening edge of the box base (102) via the groove.

3. The junction box according to claim 1, characterized in that: The box cover (101) is fixedly provided with a plurality of clamping columns, and the box base (102) is fixedly provided with a plurality of clamping slots matching the clamping columns; The plurality of clamping posts of the box cover (101) are connected in a one-to-one corresponding clamping manner with the plurality of clamping slots on the box base (102).

4. The junction box according to claim 1, characterized in that: The box cover (101) is provided with a warning light, and the warning light is electrically connected to the rapid shut-off device (103).

5. The junction box according to claim 1, characterized in that: A reflective heat-insulating coating is provided on the outer surface of the box cover (101) and / or the box base (102).

6. The junction box according to claim 1, characterized in that: The connection ends of the first positive electrode interface (208), the second positive electrode interface, the first negative electrode interface (209) and the second negative electrode interface (210) are arranged in a convex arc shape, a corrugated shape or a curved surface shape.

7. A photovoltaic power generation assembly junction box system, characterized in that: It comprises a first side wire box, a second side wire box, a first output terminal, a second output terminal and a junction box (10), wherein the junction box (10) is set as the junction box (10) according to any one of claims 1 to 6; The first side wire box is connected to the third positive electrode interface (201), and the second side wire box is connected to the third negative electrode interface (205); The fourth positive electrode interface (207) is connected to the first output end, and the fourth negative electrode interface (206) is connected to the second output end.

8. A photovoltaic power generation system, characterized in that: It comprises a photovoltaic power generation component and a junction box (10) according to any one of claims 1 to 6, wherein the photovoltaic power generation component is connected to the junction box (10).

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