Photovoltaic junction box

Abstract

The utility model discloses a photovoltaic junction box, comprising a junction box, a cable, a circuit device and a sealant filled in the junction box, the circuit device is arranged in the junction box; one end of the cable is connected with the circuit device, and the other end of the cable extends to the outside of the junction box; the cable is sleeved with at least one first sealing ring, and the first sealing ring is arranged at the part, which is encapsulated by the sealant, of the cable. The photovoltaic junction box provided by the utility model is good in waterproof performance, and can prevent moisture from permeating into a circuit device through a gap at the joint of the sealant and the cable and affecting the performance of the circuit device in the junction box.

Description

Technical Field

[0001] The utility model relates to the technical field of solar photovoltaics, and particularly relates to a photovoltaic junction box. Background Art

[0002] The photovoltaic disconnect junction box is a specially designed junction box that provides additional safety functions in a solar photovoltaic system. This junction box integrates a quick-disconnect function and can quickly cut off the electrical connection between the photovoltaic array and the inverter or the grid when detecting specific situations (such as grid faults, fires, maintenance, or emergency situations) to ensure personnel safety and system reliability. The photovoltaic disconnect junction box is connected to other components through cables.

[0003] The potting of the photovoltaic junction box is an important link in the manufacturing process of photovoltaic modules. It is to pour a special colloidal material inside the photovoltaic junction box to enhance the protection performance and durability of the junction box. The main purposes of the potting compound are: Sealing protection: The potting compound can completely fill the gaps inside the junction box, forming a closed protective layer, effectively preventing moisture, dust, and other external pollutants from entering the inside of the junction box, protecting the internal electrical components from damage, and extending the service life of the junction box and the entire photovoltaic module. Selecting an appropriate potting compound is crucial for the quality of the photovoltaic junction box, which not only relates to the reliability and safety of the photovoltaic module but also is one of the important factors to ensure the long-term stable operation of the photovoltaic power station.

[0004] Currently, hard glue is mostly potted inside the photovoltaic disconnect junction box, such as the HT-5299W model glue from Huitian. However, due to the large influence of hard glue on thermal expansion and contraction, voids are likely to occur at the cable connection, and water vapor will seep in, affecting the performance of the circuit board inside the junction box.

[0005] The disclosure of the above background art content is only used to assist in understanding the concept and technical solution of the utility model, and it does not necessarily belong to the prior art of this application, nor will it necessarily give technical guidance; without clear evidence indicating that the above content was publicly available before the filing date of this application, the above background art should not be used to evaluate the novelty and creativity of this application. Summary of the Utility Model

[0006] The purpose of the utility model is to provide a photovoltaic junction box that can improve the waterproofness and reliability of the photovoltaic junction box.

[0007] To achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0008] A photovoltaic junction box includes a junction box, cables, circuit components, and a sealant filling the junction box, wherein:

[0009] The circuit components are arranged inside the junction box;

[0010] One end of the cable is connected to the circuit device, and the other end of the cable extends outside the junction box;

[0011] At least one first sealing ring is sleeved on the cable, and the first sealing ring is arranged at the part of the cable that is encapsulated by the sealant.

[0012] Further, based on any one of the foregoing technical solutions or a combination of multiple technical solutions, the first sealing ring does not contact the junction box;

[0013] Further, the minimum distance from the first sealing ring to the connection part of the cable and the junction box is not less than 1 mm.

[0014] Further, based on any one of the foregoing technical solutions or a combination of multiple technical solutions, a second sealing ring is further included. The second sealing ring is sleeved on the cable, and the cable and the junction box are hermetically connected through the second sealing ring.

[0015] Further, based on any one of the foregoing technical solutions or a combination of multiple technical solutions, the number of the second sealing rings is one or more; and / or,

[0016] The number of the cables is multiple, and the first sealing ring and the second sealing ring are arranged on each cable.

[0017] Further, based on any one of the foregoing technical solutions or a combination of multiple technical solutions, the junction box includes a box body and an upper cover. The box body and the upper cover are connected in a matching manner to form an accommodation cavity, and the accommodation cavity is configured to accommodate the circuit device, part of the cable, and encapsulate the sealant;

[0018] A first extension part is arranged on the box body, and a second extension part is arranged on the upper cover. When the box body and the upper cover are connected in a matching manner, the first extension part and the second extension part cooperate with each other and form a through hole for the cable to pass through between the first extension part and the second extension part.

[0019] Further, based on any one of the foregoing technical solutions or a combination of multiple technical solutions, a first cable groove is arranged on the first extension part, and a second cable groove is arranged on the second extension part. The first cable groove and the second cable groove cooperate with each other and form a through hole for the cable to pass through.

[0020] Further, based on any one of the foregoing technical solutions or a combination of multiple technical solutions, a first groove is arranged on the first cable groove, and a second groove is arranged on the second cable groove. The first groove and the second groove cooperate with each other to form an annular groove for accommodating part of the second sealing ring.

[0021] Further, based on any one of the foregoing technical solutions or a combination of multiple technical solutions, the box body and the upper cover are connected by a snap - fit component. The snap - fit component includes a card slot and a catch. The card slot and the catch are two components, one of which is disposed on the box body and the other is disposed on the upper cover. When the box body and the upper cover are cooperatively connected, the catch is snapped into the card slot.

[0022] Further, based on any one of the foregoing technical solutions or a combination of multiple technical solutions, one or more positioning posts are disposed in the box body. The positioning posts are configured to limit the installation position of the circuit device in the box body; and / or,

[0023] One or more support members are disposed in the box body. The upper end surface of the support member is in contact connection with the bottom surface of the circuit device.

[0024] Further, based on any one of the foregoing technical solutions or a combination of multiple technical solutions, a potting hole is provided on the junction box. The sealant is configured to be poured into the junction box from the potting hole; and / or,

[0025] An exhaust hole is provided on the junction box.

[0026] The beneficial effects brought by the technical solutions provided by the present utility model are as follows:

[0027] a. By providing the first sealing ring at the position of the cable inside the junction box and encapsulating the first sealing ring with the sealant, the present utility model can improve the sealing performance between the cable and the sealant. The first sealing ring can prevent water vapor from infiltrating into the circuit device through the gap generated at the connection between the cable and the sealant due to the thermal expansion and contraction of the sealant, thus affecting the performance of the circuit device.

[0028] b. By using the second sealing ring to seal - connect the cable and the junction box, the present utility model can not only further improve the waterproof performance of the junction box but also has a low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0030] Figure 1 A cross - sectional view of the junction box provided for an exemplary embodiment of the present utility model;

[0031] Figure 2An exploded view of a junction box provided for an exemplary embodiment of the present utility model from a first angle;

[0032] Figure 3 An exploded view of a junction box provided for an exemplary embodiment of the present utility model from a second angle;

[0033] Figure 4 An internal structure diagram of a junction box without an upper cover provided for an exemplary embodiment of the present utility model;

[0034] Figure 5 is Figure 2 an enlarged view shown at A in

[0035] Wherein, the reference numerals include: 1 - junction box, 11 - box body, 111 - card slot, 112 - positioning post, 113 - support member, 115 - first extension portion, 118 - first groove, 12 - upper cover, 121 - hook, 122 - potting hole, 123 - exhaust hole, 125 - second extension portion, 128 - second groove, 2 - cable, 3 - circuit device, 31 - positioning hole, 4 - sealant, 5 - first sealing ring, 6 - second sealing ring, 7 - connector. Detailed implementation manners

[0036] In order to enable those skilled in the art to better understand the solution of the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0037] It should be noted that the terms "first", "second", etc. in the description and claims of the present utility model and the above accompanying drawings are used to distinguish similar objects, and do not necessarily need to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present utility model described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, device, product or equipment that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or equipment.

[0038] In an embodiment of the present utility model, a photovoltaic junction box is provided. Refer to Figures 1 to 4, the photovoltaic junction box includes a junction box 1, a cable 2, circuit components 3, and a sealant 4 filling the junction box 1, where:

[0039] The circuit components 3 are arranged inside the junction box 1;

[0040] One end of the cable 2 is connected to the circuit components 3, and the other end of the cable 2 extends outside the junction box 1 and is connected to an external device such as a connector 7;

[0041] At least one first sealing ring 5 is sleeved on the cable 2, and the first sealing ring 5 is arranged at the part of the cable 2 that is encapsulated by the sealant 4.

[0042] In the present utility model, by arranging the first sealing ring 5 at the position where the cable 2 is inside the junction box 1, and the sealant 4 wraps the first sealing ring 5, the sealing performance between the cable 2 and the sealant 4 can be improved. Even if voids are generated at the cable due to the thermal expansion and contraction of the hard glue, water vapor will not penetrate into the circuit components 3 due to the blocking of the first sealing ring 5 and affect the performance of the circuit components 3 inside the junction box.

[0043] The first sealing ring is not in contact with the junction box. Preferably, the minimum distance from the first sealing ring 5 to the connection part of the cable 2 and the junction box 1 is not less than 1 mm, so as to ensure that the first sealing ring 5 is fully wrapped by the sealant 4 and improve the reliability of the sealed connection between the cable and the sealant.

[0044] In an embodiment of the present utility model, one or more second sealing rings 6 are further arranged on the cable 2, and the cable 2 and the junction box 1 are sealed and connected through the second sealing rings 6. Through the second sealing rings 6, the sealing performance of the photovoltaic junction box can be further improved, and the waterproof strength of the junction box can be enhanced.

[0045] See Figures 2 to 4 , the junction box 1 includes a box body 11 and an upper cover 12. The box body 11 and the upper cover 12 are cooperatively connected to form an accommodation cavity, and the accommodation cavity is configured to accommodate the circuit components 3, part of the cable 2, and the sealant 4 for encapsulation.

[0046] As Figure 2 shown, a first extension part 115 is arranged on the box body 11, and a second extension part 125 is arranged on the upper cover 12. When the box body 11 and the upper cover 12 are cooperatively connected, the first extension part 115 and the second extension part 125 cooperate with each other and form a through hole for the cable 2 to pass through between the first extension part 115 and the second extension part 125. The first extension part 115 and the second extension part 125 play a role in positioning and protecting the cable 2.

[0047] Specifically, a first cable groove is provided on the first extension portion 115, and a second cable groove is provided on the second extension portion 125. The first cable groove and the second cable groove cooperate with each other to form a through hole for the cable 2 to pass through. The number of the first cable grooves and the second cable grooves corresponds to the number of the cables 2.

[0048] The second sealing ring 6 is arranged at the position where the first extension portion 115 and the second extension portion 125 cooperate with each other. As Figure 1 shown, a first groove 118 is provided on the first cable groove, and a second groove 128 is provided on the second cable groove. The first groove and the second groove cooperate with each other to form an annular groove for accommodating a part of the second sealing ring 6.

[0049] It should be noted that the number of the cables 2 may be one or more. If the number of the cables 2 is more than one, the first sealing ring 5 and the second sealing ring 6 are arranged on each of the cables 2. The second sealing ring 6 provided in this embodiment is sleeved on the cable 2, which can reduce the cost compared with the annular sealing ring / sealing gasket arranged at the joint of the box body 11 and the upper cover 12. The first sealing ring 5 and the second sealing ring 6 are preferably elastic sealing rings.

[0050] In this embodiment, as Figure 2 shown, the box body 11 and the upper cover 12 are connected by a clamping component. The clamping component includes a clamping groove 111 and a clamping hook 121. One of the two components of the clamping groove 111 and the clamping hook 121 is arranged on the box body 11, and the other component is arranged on the upper cover 12. When the box body 11 and the upper cover 12 are connected in cooperation, the clamping hook 121 is clamped in the clamping groove 111.

[0051] One or more positioning posts 112 are arranged in the box body 11. The positioning posts 112 are configured to limit the installation position of the circuit device 3 in the box body 11. As Figure 2 shown, positioning holes 31 are provided on the circuit device 3, and the positioning posts 112 are inserted into the positioning holes 31 one by one.

[0052] One or more supporting members 113 are further arranged in the box body 11. The upper end surface of the supporting member 113 is in contact connection with the bottom surface of the circuit device 3.

[0053] Preferably, as Figure 5 shown, the positioning posts 112 and the supporting members 113 are of an integral structure, and a part of the upper end of the supporting member 113 extends upward to form the positioning posts 112. More preferably, the supporting member 113 as Figure 5It is arranged on three sides of the positioning post 112, and plays a role of three-point stable support for the circuit device 3.

[0054] As Figure 3 shown, the junction box 1 is provided with a potting hole 122 and an exhaust hole 123. The sealant 4 is configured to be poured into the junction box 1 from the potting hole 122. During the potting process, the air in the junction box 1 is discharged to the outside of the junction box through the exhaust hole 123. After potting is completed, the potting hole 123 is hermetically connected through a sealing plug 134.

[0055] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the element.

[0056] The above description is only the specific implementation manner of the present application. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present application, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present application.

Claims

1. A photovoltaic junction box, characterized in that: The invention comprises a junction box (1), a cable (2), a circuit device (3), and a sealant (4) filling the junction box (1), wherein: The circuit device (3) is arranged inside the junction box (1); One end of the cable (2) is connected to the circuit device (3), and the other end of the cable (2) extends to the outside of the junction box (1); At least one first sealing ring (5) is sleeved on the cable (2), and the first sealing ring (5) is arranged at a position on the cable (2) that is sealed by the sealant (4).

2. The photovoltaic junction box according to claim 1, characterized in that: The first sealing ring (5) does not contact the junction box (1).

3. The photovoltaic junction box according to claim 1, characterized in that: It also comprises a second sealing ring (6), wherein the second sealing ring (6) is sleeved on the cable (2), and the cable (2) and the junction box (1) are sealed and connected via the second sealing ring (6).

4. The photovoltaic junction box according to claim 3, characterized in that: The number of the second sealing ring (6) is one or more; and / or, There are a plurality of cables (2), and each cable (2) is provided with the first sealing ring (5) and the second sealing ring (6).

5. The photovoltaic junction box according to claim 3, characterized in that: The junction box (1) comprises a box body (11) and an upper cover (12), wherein the box body (11) and the upper cover (12) are connected to form a receiving cavity, wherein the receiving cavity is configured to receive the circuit device (3), part of the cable (2) and to pot the sealant (4); The box body (11) is provided with a first extension portion (115), and the upper cover (12) is provided with a second extension portion (125); when the box body (11) and the upper cover (12) are connected in a mating manner, the first extension portion (115) and the second extension portion (125) cooperate with each other and form a through hole for the cable (2) to pass through between the first extension portion (115) and the second extension portion (125).

6. The photovoltaic junction box according to claim 5, characterized in that: The first extension portion (115) is provided with a first cable groove, and the second extension portion (125) is provided with a second cable groove, the first cable groove and the second cable groove cooperate with each other to form a through hole for the cable (2) to pass through.

7. The photovoltaic junction box according to claim 6, characterized in that: The first cable groove is provided with a first groove (118), and the second cable groove is provided with a second groove (128), and the first groove and the second groove cooperate with each other to form an annular groove for accommodating a portion of the second sealing ring (6).

8. The photovoltaic junction box according to claim 5, characterized in that: The box body (11) and the upper cover (12) are connected via a snap-fit ​​assembly, wherein the snap-fit ​​assembly comprises a snap-fit ​​slot (111) and a snap-fit ​​hook (121). The snap-fit ​​slot (111) and the snap-fit ​​hook (121) are two parts, one of which is arranged on the box body (11) and the other is arranged on the upper cover (12). When the box body (11) and the upper cover (12) are connected in a matching manner, the snap-fit ​​hook (121) is arranged in the snap-fit ​​slot (111).

9. The photovoltaic junction box according to claim 5, characterized in that: One or more positioning posts (112) are arranged in the box body (11), and the positioning posts (112) are configured to limit the installation position of the circuit device (3) in the box body (11); and / or, One or more support members (113) are arranged in the box body (11), and the upper end surface of the support member (113) is in contact with the bottom surface of the circuit device (3).

10. The photovoltaic junction box according to claim 1, characterized in that: The junction box (1) is provided with a glue injection hole (122), and the sealant (4) is configured to be injected into the junction box (1) from the glue injection hole (122); and / or, The junction box (1) is provided with an exhaust hole (123).

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