Photovoltaic junction box

Abstract

The utility model discloses a photovoltaic junction box, including box cover and box body, the box cover with the box body mutually supports and forms first accommodating cavity, the box body includes bottom wall and side wall, bottom wall is recessed to the box cover direction of side wall and forms second accommodating cavity, second accommodating cavity with first accommodating cavity set up in the both sides of bottom wall, the bottom of side wall is connected with installation panel, second accommodating cavity is configured as accommodating sealant, the utility model discloses a second accommodating cavity for accommodating sealant is set up in the bottom of photovoltaic junction box, can make photovoltaic junction box more reliable, firmly with photovoltaic module connection, and then improve the reliability and service life of photovoltaic junction box.

Description

Technical Field

[0001] This utility model relates to the field of solar photovoltaic technology, and in particular to a photovoltaic junction box. Background Technology

[0002] With the continuous growth of global energy demand and increasing emphasis on environmental protection, solar energy, as a clean and renewable energy source, has been widely used. Photovoltaic modules, such as solar panels, are the core components of solar power generation systems, and their performance and reliability directly affect the power generation efficiency and lifespan of the entire system. Photovoltaic junction boxes, as an important component of photovoltaic modules, play a crucial role in connecting the photovoltaic modules to external circuits, and their main function is to improve the reliability and efficiency of the photovoltaic system.

[0003] In existing photovoltaic (PV) junction box installation techniques, sealant (such as silicone sealant) is typically used to fix the junction box to the back of the PV module. This fixing method not only securely installs the junction box onto the PV module, but also effectively protects the internal electrical components of the junction box from external environmental influences through the waterproof and dustproof properties of the sealant, thereby extending the lifespan of the PV module. During installation, sealant is usually applied around the bottom of the junction box to ensure a tight seal between it and the PV module, preventing moisture ingress.

[0004] However, the existing method of fixing photovoltaic modules by simply applying sealant around the bottom of the junction box has certain limitations. With long-term use, the sealant may gradually age, crack, or even peel off due to environmental factors (such as temperature changes and ultraviolet radiation). Once the sealant cracks or peels off, it not only compromises its waterproofing performance, allowing moisture to enter the junction box and affect the normal operation of electrical components, but it also poses a risk of the junction box detaching from the photovoltaic module, thus seriously affecting the stability and safety of the photovoltaic system. Therefore, the existing method of fixing photovoltaic junction boxes presents certain safety hazards during long-term use and urgently needs improvement.

[0005] The above background information is provided only to assist in understanding the concept and technical solution of this utility model. It does not necessarily belong to the prior art of this application, nor does it necessarily provide technical guidance. In the absence of clear evidence that the above information was disclosed before the filing date of this application, the above background information should not be used to evaluate the novelty and inventiveness of this application. Utility Model Content

[0006] The purpose of this invention is to provide a photovoltaic junction box that can improve the reliability and service life of the photovoltaic junction box.

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

[0008] A photovoltaic junction box, characterized in that it includes a cover and a body, wherein the cover and the body cooperate with each other to form a first receiving cavity;

[0009] The box body includes a bottom wall and a side wall. The bottom wall is recessed relative to the side wall in the direction of the box cover to form a second receiving cavity. The second receiving cavity and the first receiving cavity are disposed on both sides of the bottom wall.

[0010] The bottom of the sidewall is connected to the mounting panel, and the second receiving cavity is configured to receive sealant.

[0011] Furthermore, following any one or a combination of the aforementioned technical solutions, a partition is provided inside the first receiving cavity, the partition dividing the first receiving cavity into a third receiving cavity and a fourth receiving cavity, the third receiving cavity being configured to receive electrical components and sealant.

[0012] Furthermore, following any one or a combination of the aforementioned technical solutions, the number of partitions is multiple, and the multiple partitions divide the first receiving cavity into a third receiving cavity and multiple fourth receiving cavities, with the multiple fourth receiving cavities disposed outside the third receiving cavity.

[0013] Furthermore, in accordance with any or a combination of the aforementioned technical solutions, the upper end of the partition is provided with a glue-leakage groove, and the third and fourth accommodating cavities are connected through the glue-leakage groove. Preferably, the upper end of the partition is abutted against the lower end of the box cover.

[0014] The fourth receiving cavity is also configured to receive sealant overflowing from the third receiving cavity through the leak groove.

[0015] Furthermore, following any one or a combination of the aforementioned technical solutions, the second accommodating cavity is provided with one or more reinforcing ribs, which are respectively connected to the bottom wall and the side wall.

[0016] Furthermore, following any one or a combination of the aforementioned technical solutions, a first through hole is provided on the bottom wall, the first through hole being configured to accommodate some electrical components inside the photovoltaic junction box.

[0017] Furthermore, following any one or a combination of the aforementioned technical solutions, a second through hole is provided on the bottom wall, and the second through hole is located at the welding position of electrical components and cables inside the photovoltaic junction box.

[0018] Furthermore, following any one or a combination of the aforementioned technical solutions, an extension is provided at the bottom of the sidewall, the extension extending outward along the vertical direction of the sidewall towards the outside of the box body, in order to increase the contact area between the junction box and the photovoltaic module and improve the reliability of their connection.

[0019] Furthermore, in accordance with any or a combination of the aforementioned technical solutions, a support component is provided inside the first accommodating cavity, and the support component is configured to support the electrical components inside the photovoltaic junction box;

[0020] The upper end of the support component is provided with a limiting post, which is configured to pass through the circuit board, the photovoltaic bypass module, or the photovoltaic power semiconductor module.

[0021] Furthermore, following any one or a combination of the aforementioned technical solutions, a cable connection portion is provided on the side of the box body, and a wire-passing hole is provided on the cable connection portion, the wire-passing hole communicating with the first receiving cavity.

[0022] The beneficial effects of the technical solution provided by this utility model are as follows:

[0023] a. This utility model provides a second receiving cavity at the bottom of the photovoltaic junction box to hold the sealant and bond it to the photovoltaic module. This not only increases the area of ​​the photovoltaic junction box and the photovoltaic module bonded by the sealant and makes the bond stronger, but also makes the sealant in the second receiving cavity less prone to aging and cracking due to environmental factors such as sunlight, because of the shielding of the box body. In addition, the sealant in the second receiving cavity can also better protect the electrical components inside the junction box.

[0024] b. This utility model divides the first receiving cavity of the photovoltaic junction box into a third receiving cavity and a fourth receiving cavity by setting a partition. The third receiving cavity is used to accommodate electrical components and potting sealant. The fourth receiving cavity, as an outer cavity, can save the amount of sealant. During the potting process, the sealant overflowing from the third receiving cavity flows into the fourth receiving cavity to achieve the purpose of sufficient potting. In subsequent use, when the photovoltaic junction box is heated, the sealant in the third receiving cavity expands into the fourth receiving cavity, so as not to damage the photovoltaic junction box; when the photovoltaic junction box is cooled, the sealant overflowing from the fourth receiving cavity contracts into the third receiving cavity, so as not to create gaps between the sealant and the cavity wall of the fourth receiving cavity. This can better protect the electrical components inside the photovoltaic junction box and further improve the service life and reliability of the photovoltaic junction box. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 A first-angle perspective view of a photovoltaic junction box provided as an exemplary embodiment of the present invention;

[0027] Figure 2 A second-angle perspective view of a photovoltaic junction box provided as an exemplary embodiment of the present invention;

[0028] Figure 3 This is a top view schematic diagram of a photovoltaic junction box assembly provided as an exemplary embodiment of the present invention.

[0029] The reference numerals in the attached drawings include: 100-box cover, 200-box body, 210-bottom wall, 211-first through hole, 212-second through hole, 220-side wall, 230-partition, 231-adhesive leakage groove, 240-reinforcing rib, 250-supporting component, 260-cable connection part, 310-first receiving cavity, 311-third receiving cavity, 312-fourth receiving cavity, 320-second receiving cavity, and 400-cable. Detailed Implementation

[0030] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0031] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the utility model described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, apparatus, product, or device that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or devices.

[0032] While existing photovoltaic (PV) junction box fixing technologies can meet the installation requirements of PV modules to a certain extent, long-term use can lead to decreased waterproofing and the risk of junction box detachment due to sealant aging, thus failing to fully guarantee the reliability and stability of the PV system. Therefore, this application proposes a PV junction box that can be more reliably and securely installed on PV modules and has a long service life.

[0033] In one embodiment of this utility model, a photovoltaic junction box is provided, such as... Figure 1 and Figure 2 As shown, the photovoltaic junction box includes a cover 100 and a body 200. The cover 100 and the body 200 cooperate to form a first receiving cavity 310. The body 200 includes a bottom wall 210 and a side wall 220. The bottom wall 210 is recessed relative to the side wall 220 in the direction of the cover 100 to form a second receiving cavity 320. The second receiving cavity 320 and the first receiving cavity 310 are disposed on both sides of the bottom wall 210. The bottom of the side wall 220 is connected to a mounting panel. The second receiving cavity 320 is configured to receive sealant. The first receiving cavity 310 is configured as a sealed cavity. Specifically, sealant can be poured into the first receiving cavity 310, or the cover 100 and the body 200 can be sealed together.

[0034] During use, the sealant inside the second receiving cavity 320 adheres to the photovoltaic module. This not only results in a larger bonded area and stronger adhesion between the photovoltaic junction box and the photovoltaic module, but also, due to the shielding effect of the box, the sealant inside the second receiving cavity 320 is less prone to aging and cracking due to environmental factors such as sunlight. Furthermore, the sealant inside the second receiving cavity 320 also provides better protection for the electrical components inside the junction box.

[0035] Preferably, one or more reinforcing ribs 240 are provided in the second receiving cavity 320, and the reinforcing ribs 240 are respectively connected to the bottom wall 210 and the side wall 220, which can improve the structural stability of the photovoltaic junction box. An extension is provided at the bottom of the side wall 220, and the extension extends outward of the box body 200 along the vertical direction of the side wall 220.

[0036] The first receiving cavity 310 has a support member 250 inside, which is configured to support electrical components inside the photovoltaic junction box. These electrical components are typically photovoltaic bypass modules, photovoltaic power semiconductor modules, or other circuit boards. A limiting post is provided at the upper end of the support member 250, configured to pass through the circuit board, photovoltaic bypass module, or photovoltaic power semiconductor module. A cable connection portion 260 is provided on the side of the box body 200, extending outwards from the box body 200. The cable connection portion 260 has a through hole that communicates with the first receiving cavity 310. The cable connection portion 260 can be configured as follows: Figure 1 and Figure 2 As shown, it extends outward from the box 200 along the vertical direction of the side wall 220; the cable connection portion 260 can also be as follows: Figure 3 The cable connection portion 260 extends outward from one corner of the housing 200 at an angle, for example, 45° / 135°, to the side wall 220. It should be noted that the scope of protection of this application is not limited by the specific location of the cable connection portion 260 on the housing 200 or the direction of its extension.

[0037] The bottom wall 210 is provided with a first through hole 211 and a second through hole 212. The first through hole 211 is configured to accommodate some electrical components inside the photovoltaic junction box. The second through hole 212 is located at the welding position of the electrical components and cables inside the photovoltaic junction box, so as to weld the cable 400 to the electrical components inside the photovoltaic junction box.

[0038] In one embodiment of the present invention, the first receiving cavity 310 is configured to receive sealant. In this embodiment, a partition 230 is provided inside the first receiving cavity 310, the partition 230 dividing the first receiving cavity 310 into a third receiving cavity 311 and a fourth receiving cavity 312, the third receiving cavity 311 being configured to receive electrical components and sealant.

[0039] More preferably, there are multiple partitions 230, which divide the first receiving cavity 310 into a third receiving cavity 311 and multiple fourth receiving cavities 312, with the multiple fourth receiving cavities 312 disposed outside the third receiving cavity 311. Figure 2 As shown, two fourth receiving cavities 312 are distributed on one side of the third receiving cavity 311, and two other fourth receiving cavities 312 are distributed at the two corners on the other side of the third receiving cavity 311. In other embodiments, multiple fourth receiving cavities 312 may also be provided around the third receiving cavity 311. It should be noted that the third receiving cavity 311 is configured to accommodate all electrical components within the photovoltaic junction box, including cable portions extending into the box that connect to the internal electrical components.

[0040] In this embodiment, the upper end of the partition 230 abuts against the lower end of the cover 100, and the upper end of the partition 230 is provided with a glue leakage groove 231. The third receiving cavity 311 and the fourth receiving cavity 312 are connected through the glue leakage groove 231. The fourth receiving cavity 312 is also configured to receive sealant overflowing from the third receiving cavity 311 through the glue leakage groove 231.

[0041] By setting the partition 230, the amount of adhesive used in the first receiving cavity can be reduced. During sealing, adhesive only needs to be applied to the space of the third receiving cavity 3111; no other areas require adhesive application. Adhesive overflowing from the third receiving cavity 311 flows into the fourth receiving cavity 312 to achieve sufficient adhesive application. Furthermore, during subsequent use, when the photovoltaic junction box is heated, the adhesive in the third receiving cavity 311 expands into the fourth receiving cavity 312, preventing damage to the photovoltaic junction box. When the photovoltaic junction box is cooled, the adhesive overflowing from the fourth receiving cavity 312 contracts back into the third receiving cavity 311, preventing gaps between the adhesive and the cavity wall of the third receiving cavity 311. This better protects the electrical components inside the photovoltaic junction box, further improving its service life and reliability.

[0042] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0043] The above description is only a specific embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A photovoltaic junction box, characterized in that, It includes a lid (100) and a body (200), the lid (100) and the body (200) cooperating with each other to form a first receiving cavity (310); The box body (200) includes a bottom wall (210) and a side wall (220). The bottom wall (210) is recessed relative to the side wall (220) in the direction of the box cover (100) to form a second receiving cavity (320). The second receiving cavity (320) and the first receiving cavity (310) are disposed on both sides of the bottom wall (210). The bottom of the sidewall (220) is connected to the mounting panel, and the second receiving cavity (320) is configured to receive sealant.

2. The photovoltaic junction box according to claim 1, characterized in that, The first receiving cavity (310) is provided with a partition (230) that divides the first receiving cavity (310) into a third receiving cavity (311) and a fourth receiving cavity (312). The third receiving cavity (311) is configured to receive electrical components and sealant.

3. The photovoltaic junction box according to claim 2, characterized in that, The number of partitions (230) is multiple, and the multiple partitions (230) divide the first receiving cavity (310) into a third receiving cavity (311) and multiple fourth receiving cavities (312), and the multiple fourth receiving cavities (312) are disposed on the outside of the third receiving cavity (311).

4. The photovoltaic junction box according to claim 2, characterized in that, The upper end of the partition (230) is provided with a glue-leaking groove (231), and the third receiving cavity (311) and the fourth receiving cavity (312) are connected through the glue-leaking groove (231); The fourth receiving cavity (312) is also configured to receive sealant overflowing from the third receiving cavity (311) through the sealant drain groove (231).

5. The photovoltaic junction box according to claim 1, characterized in that, The second receiving cavity (320) is provided with one or more reinforcing ribs (240), which are connected to the bottom wall (210) and the side wall (220) respectively.

6. The photovoltaic junction box according to claim 1, characterized in that, The bottom wall (210) is provided with a first through hole (211), which is configured to accommodate some electrical components inside the photovoltaic junction box.

7. The photovoltaic junction box according to claim 1, characterized in that, A second through hole (212) is provided on the bottom wall (210), and the second through hole (212) is located at the welding position of electrical components and cables (400) inside the photovoltaic junction box.

8. The photovoltaic junction box according to claim 1, characterized in that, The bottom of the side wall (220) is provided with an extension, which extends outward of the box body (200) along the vertical direction of the side wall (220).

9. The photovoltaic junction box according to claim 1, characterized in that, The first receiving cavity (310) is provided with a support member (250), which is configured to support electrical components inside the photovoltaic junction box; The upper end of the support component (250) is provided with a limiting post, which is configured to pass through the circuit board, the photovoltaic bypass module, or the photovoltaic power semiconductor module.

10. The photovoltaic junction box according to claim 1, characterized in that, The side of the box (200) is provided with a cable connection part (260), and the cable connection part (260) is provided with a wire hole, which communicates with the first receiving cavity (310).

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