Photovoltaic junction box

Abstract

The utility model discloses a photovoltaic junction box which comprises a box body, the box body comprises a box body bottom and box body side portions located on the periphery of the box body bottom, the box body bottom and the box body side portions jointly form a containing space, and a bypass protection module is arranged in the containing space. The bottom of the box body comprises extension parts located on the two sides and a sunken part which is located between the extension parts on the two sides and is sunken towards the direction of the containing space, and the sunken part is provided with one or more bus bar penetrating holes. The filling amount of the sealant at the bus bar through hole is increased, and the sealing effect is ensured.

Description

Technical Field

[0001] The utility model relates to the photovoltaic field, in particular to a photovoltaic junction box. Background Art

[0002] A photovoltaic junction box is a component specifically designed for use in solar photovoltaic (PV) power generation systems, playing a critical role in both connection and protection. It is responsible for transmitting the electricity generated by the solar panels to other components of the system, such as the inverter or battery, ensuring that the current can be efficiently drawn from the PV array and put into use. The PV junction box must be well sealed and weather-resistant to protect the internal circuitry from environmental factors such as rain, dust, and extreme temperatures.

[0003] Junction boxes typically incorporate bypass diodes or reverse charge protection diodes to prevent the "hot spot effect" and protect solar panels from damage. Furthermore, the PV junction box requires potting compound to insulate and protect the electrical components within. Therefore, the design of the junction box must not only ensure the stable and reliable operation of the electrical components within, but also ensure that the potting compound adequately encapsulates the components, effectively preventing moisture and dust intrusion and protecting the internal circuitry of the PV panels, thereby preventing moisture-induced performance degradation or equipment damage.

[0004] The photovoltaic junction box is an indispensable part of the solar photovoltaic power generation system. The design of the photovoltaic junction box not only needs to ensure the effective transmission of electricity, but also needs to improve the overall reliability and life of the system through various protection mechanisms.

[0005] Currently, during the glue filling and packaging process, there are problems such as slow glue filling and packaging speed and insufficient glue filling and packaging. Utility Model Content

[0006] The technical problem solved by the utility model is to provide a photovoltaic junction box in which a potting adhesive can quickly and fully wrap the electrical components in the junction box.

[0007] The technical solution adopted by the present invention to solve its technical problems is: a photovoltaic junction box, including a box body, the box body including a box body bottom and a box body side located around the box body bottom, the box body bottom and the box body side together constitute a accommodating space, a bypass protection module is arranged in the accommodating space, the box body bottom includes outer edge portions located on both sides and a recessed portion located between the outer edge portions on both sides and recessed toward the accommodating space, the recessed portion is provided with one or more busbar perforations.

[0008] Furthermore, a guide portion is provided between the busbar through-hole and the end surface of the recessed portion, and the guide portion extends obliquely from the end surface of the recessed portion toward the accommodating space to the edge of the busbar through-hole.

[0009] Furthermore, guide portions are provided on both sides of the busbar through-hole, and the horizontal distances between the guide portions on both sides and the busbar through-hole gradually decrease from bottom to top.

[0010] Furthermore, a glue leakage hole is provided on a side of the guide portion away from the busbar perforation, and the length of the glue leakage hole along the Y-axis direction is greater than the width of the bypass protection module.

[0011] Furthermore, the glue leakage hole is the second glue leakage hole located between the guide portion and the outer edge portion, or is the third glue leakage hole located between the guide portion and the side portion of the box body.

[0012] Furthermore, a third guide surface is provided between the end surface of the third glue leakage hole close to one end of the guide portion and the guide portion, and is in transition with the guide portion.

[0013] Furthermore, at least two busbar perforations are provided, and a first glue leakage hole is provided between two adjacent busbar perforations.

[0014] Furthermore, a first connecting rib is provided in the first glue leakage hole, the first connecting rib is provided along the X-axis direction, both ends of the first connecting rib are respectively connected to the guide part, and a first guide surface transitioning to the guide part is provided on the first connecting rib.

[0015] Furthermore, a second connecting rib is provided in the second glue leakage hole along the X-axis direction, the side of the second connecting rib away from the guide part is fixedly connected to the bottom of the box body, and the side of the second connecting rib close to the guide part is fixedly connected to the guide part, and a second guide surface that transitions with the guide part is provided on the second connecting rib.

[0016] Furthermore, a gap or perforation is provided in the guide portion along the Y-axis direction, the length of the gap along the Y-axis direction is smaller than the length of the busbar perforation along the Y-axis direction, and the second connecting rib is suspended in the gap on one side close to the guide portion.

[0017] Furthermore, one end of the guide portion facing the accommodating space forms a supporting surface in the accommodating space for supporting the bypass protection module.

[0018] The beneficial effects of the utility model are:

[0019] 1. In this structure, the provision of the recessed portion can accelerate the flow rate of the sealant, and at the same time, increase the filling amount of the sealant at the perforation of the busbar, thereby ensuring the sealing effect.

[0020] 2. In this structure, the provision of the guide portion makes it easier for the busbar to penetrate into the accommodation space, thereby improving the installation convenience of the junction box.

[0021] 3. In this structure, the setting of the glue leakage hole can achieve better glue flow.

[0022] 4. In this structure, the first connecting rib and the second connecting rib are provided to prevent the busbar from penetrating into the first glue leakage hole or the second glue leakage hole when penetrating into the junction box.

[0023] 5. In this structure, a gap or through hole is opened in the guide part to facilitate the colloid to flow into the bottom of the box body faster. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic structural diagram of a photovoltaic junction box according to an embodiment of the present application.

[0025] Figure 2 This is a schematic structural diagram of a photovoltaic junction box assembly according to an embodiment of the present application.

[0026] Figure 3 This is a schematic diagram of the structure of the left junction box, middle junction box and right junction box in this application.

[0027] Figure 4 This is a schematic structural diagram of the second connecting rib and the recessed portion when connected in this application.

[0028] Figure 5 This is a schematic diagram of the bypass protection module in this application when it is installed in the box body.

[0029] Figure 6 This is a comparison diagram when the length of the glue leakage hole along the Y-axis direction is greater than the width of the bypass protection module in this application.

[0030] Figure 7 Schematic diagram of the position of gap C when the bypass protection module is installed in the box body in this application.

[0031] Marked in the figure are: box body 1, box body bottom 21, box body side 22, accommodating space 3, bypass protection module 4, outer edge 5, recessed portion 6, busbar perforation 61, guide portion 62, gap 621, perforation 622, first glue leakage hole 63, first connecting rib 631, first guide surface 631a, second glue leakage hole 64, second connecting rib 641, second guide surface 641a, third glue leakage hole 65, third guide surface 65a. DETAILED DESCRIPTION

[0032] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0033] like Figure 1As shown, an embodiment of the present application discloses a photovoltaic junction box, including a box body 1, wherein the box body 1 includes a box body bottom 21 and a box body side 22 located around the box body bottom 21, the box body bottom 21 and the box body side 22 together constitute a accommodating space 3, a bypass protection module 4 is arranged in the accommodating space 3, the box body bottom 21 includes an outer edge 5 located on both sides and a recessed portion 6 located in the middle of the outer edge 5 on both sides and recessed toward the accommodating space 3, the recessed portion 6 is provided with one or more busbar perforations 61.

[0034] Specifically, when installing the photovoltaic junction box, first fix the photovoltaic junction box on the photovoltaic panel, and then inject sealant. The sealant will fully cover the bypass protection module 4.

[0035] Specifically, the number of busbar through-holes 61 needs to be designed according to the actual number of busbars, and can be 1, 2, 3, etc.

[0036] In this structure, since the recessed portion 6 is recessed from the outer edge portions 5 on both sides toward the accommodating space 3, when the sealant is poured into the accommodating space 3, the sealant flows quickly through the recessed portion 6. At the same time, the inclination of the recessed portion 6 increases the filling amount of the sealant at the busbar perforation 61.

[0037] In this embodiment, a guide portion 62 is provided between the busbar through-hole 61 and the end surface of the recessed portion 6 , and the guide portion 62 extends obliquely from the end surface of the recessed portion 6 toward the accommodating space 3 to the edge of the busbar through-hole 61 .

[0038] That is, the guide portion 62 may be located on one side or both sides of the busbar through-hole 61 .

[0039] In this structure, since the guide portion 62 extends obliquely from the end surface of the recessed portion 6 toward the accommodating space 3 to the edge of the busbar perforation 61, that is, when the busbar perforation 61 is performed, the inclined surface of the recessed portion 6 can play a guiding role, so that the busbar can be quickly and accurately extended into the busbar perforation 61 under the guidance of the inclined surface of the guide portion 62, thereby improving the installation convenience of the junction box from the beginning.

[0040] In this embodiment, guide portions 62 are provided on both sides of the busbar perforation 61, and the horizontal distance between the guide portions 62 on both sides and the busbar perforation 61 gradually decreases from bottom to top. That is, when guide portions 62 are provided on both sides of the busbar perforation 61, the guide portions 62 on both sides appear to be trumpet-shaped when viewed from the bottom of the recessed portion 6 upward.

[0041] In the above structure, by providing guide portions 62 on both sides of the busbar through-hole 61, the guide portions 62 on both sides are in a trumpet-shaped structure, so that when the busbar is inserted, the busbar can be inserted into the busbar through-hole 61 from the trumpet-shaped structure, thereby increasing the speed and accuracy of inserting the busbar.

[0042] In this embodiment, a glue leakage hole is provided on a side of the guide portion 62 away from the busbar through-hole 61 , and the length of the glue leakage hole along the Y-axis direction is greater than the width of the bypass protection module 4 .

[0043] Specifically, such as Figure 6 and Figure 7 As shown, when the bypass protection module 4 is placed in the accommodating space 3, since the length of the glue leakage hole along the Y-axis direction is greater than the width of the bypass protection module 4, that is, a>b, the bypass protection module 4 will not completely block the glue leakage hole. After the sealant is poured in, the sealant can flow vertically into the recessed portion 6 directly from the gap c between the bypass protection module 4 and the box body 1, thereby achieving better glue flow.

[0044] In this embodiment, the glue leakage hole is a second glue leakage hole 64 located between the guide portion 62 and the outer edge portion 5 or a third glue leakage hole 65 located between the guide portion 62 and the side portion 22 of the box body. A third guide surface 65a that transitions with the guide portion 62 is provided between the end surface of the third glue leakage hole 65 close to one end of the guide portion 62 and the guide portion 62.

[0045] Specifically, when the photovoltaic junction box is an intermediate junction box, the glue leakage hole is the second glue leakage hole 64, and the second glue leakage hole 64 is respectively located between the left and right guide parts 62 and the left and right outer edges 5; when the photovoltaic junction box is a left junction box, the second glue leakage hole 64 is located between the right guide part 62 and the right outer edge 5, and the third glue leakage hole 65 is located between the left guide part 62 and the left side wall; when the photovoltaic junction box is a right junction box, the second glue leakage hole 64 is located between the left guide part 62 and the left outer edge 5, and the third glue leakage hole 65 is located between the right guide part 62 and the right side wall.

[0046] Since the left side of the left junction box and the right side of the right junction box need to be connected to cables, a third glue leakage hole 65 with a larger area needs to be opened so that after the cables pass through the accommodating space 3 and are connected to the bypass protection module 4, the sealant can fully wrap the electrical components in the junction box to ensure the sealing of the entire photovoltaic junction box.

[0047] In this embodiment, at least two busbar perforations 61 are provided. A first glue leakage hole 63 is provided between two adjacent busbar perforations 61. The length of the first glue leakage hole along the Y-axis is greater than the width of the bypass protection module 4. A first connecting rib 631 is provided in the first glue leakage hole 63. The first connecting rib 631 is provided along the X-axis, and both ends of the first connecting rib 631 are connected to the guide portion 62.

[0048] In this structure, the provision of the first glue leakage hole 63 can achieve a better glue flow effect. At the same time, due to the provision of the first connecting rib 631, when the busbar passes through the photovoltaic junction box, the busbar will slide into the guide portion 62 along the first connecting rib 631, and then pass through the busbar through-hole 61.

[0049] Therefore, the provision of the first connecting rib 631 can prevent the busbar from mistakenly passing through the first leaking hole 63 , thereby reducing the probability of mistaken passing.

[0050] In this embodiment, a first guide surface 631 a transitioning to the guide portion 62 is provided on the first connecting rib 631 .

[0051] In this structure, the setting of the first guide surface 631a can guide the busbar to slide quickly into the guide portion 62, and at the same time it is equivalent to increasing the length of the guide portion 62 in the X-axis direction, thereby increasing the probability of the busbar accurately sliding into the busbar through-hole 61.

[0052] In this embodiment, a second connecting rib 641 is provided in the second glue leakage hole 64 along the X-axis direction. The side of the second connecting rib 641 away from the guide portion 62 is fixedly connected to the bottom 21 of the box body, and the side of the second connecting rib 641 close to the guide portion 62 is fixedly connected to the guide portion 62. A second guide surface 641a that transitions to the guide portion 62 is provided on the second connecting rib 641.

[0053] Specifically, the second connecting rib 641 can be connected to the outer surface of the outer edge portion 5 or the second connecting rib 641 can be connected to the outer surface of the recessed portion 6. Figure 3 and Figure 4 As shown, the design of the second connecting rib 641 allows the busbar to slide into the guide portion 62 along the second connecting rib 641 when the busbar is inserted into the photovoltaic junction box, thereby passing through the busbar through-hole 61, while preventing the busbar from being directly inserted into the second glue leakage hole 64.

[0054] In this embodiment, a gap 621 or a perforation 622 is provided in the guide portion 62 along the Y-axis direction, the length of the gap 621 along the Y-axis direction is smaller than the length of the busbar perforation 61 along the Y-axis direction, and the second connecting rib 641 is suspended in the gap 621 on one side close to the guide portion 62.

[0055] In the above structure, the setting of the gap 621 or the perforation 622 can facilitate the rapid flow of the sealant into the recessed portion 6, thereby realizing a quick glue filling operation. If there is no gap 621 or the perforation 622, the colloid will be affected by the bus strip during flow and blocked by the bus strip, thus being unable to flow. When the gap 621 is set in the guide portion 62, there is a risk of the bus strip penetrating into the gap 621. Therefore, one end of the second connecting rib 641 is suspended in the gap 621 to block the bus strip, thereby allowing the bus strip to accurately penetrate into the bus strip perforation 61.

[0056] In this embodiment, one end of the guide portion 62 facing the accommodating space 3 forms a supporting surface in the accommodating space 3 for supporting the bypass protection module 4 .

[0057] Specifically, this structural arrangement can support the bypass protection module 4 while preventing the bypass protection module 4 from contacting the bottom 21 of the box body, thereby facilitating the flow of the sealant.

[0058] Specifically, the photovoltaic junction box in this structure includes a middle junction box, a left junction box, and a right junction box. The following are specific embodiments of the above three junction boxes:

[0059] Example 1: Intermediate junction box

[0060] like Figure 1 As shown, the intermediate junction box includes a box body 1, which includes a box body bottom 21 and a box body side 22 located around the box body bottom 21, and the box body bottom 21 and the box body side 22 together constitute an accommodating space 3, and the second glue leakage hole 64 is respectively located between the left and right guide parts 62 and the left and right outer edges 5, and a second connecting rib 641 is provided in the second glue leakage hole 64 along the X-axis direction. The side of the second connecting rib 641 away from the guide part 62 is fixedly connected to the box body bottom 21, and the side of the second connecting rib 641 close to the guide part 62 is fixedly connected to the guide part 62, and the second connecting rib 641 is provided with a second guide surface 641a that transitions to the guide part 62.

[0061] Example 2: Left junction box

[0062] like Figure 3 As shown, the left junction box includes a box body 1, which includes a box body bottom 21 and a box body side 22 located around the box body bottom 21, and the box body bottom 21 and the box body side 22 together constitute an accommodating space 3, a second glue leakage hole 64 is located between the right guide portion 62 and the right outer edge portion 5, and a second connecting rib 641 is provided in the second glue leakage hole 64 along the X-axis direction, and the side of the second connecting rib 641 away from the guide portion 62 is fixedly connected to the box body bottom 21, and the side of the second connecting rib 641 close to the guide portion 62 is fixedly connected to the guide portion 62, and a second guide surface 641a that transitions to the guide portion 62 is provided on the second connecting rib 641, and a third glue leakage hole 65 is located between the left guide portion 62 and the left side wall, and a third guide surface 65a that transitions to the left guide portion 62 is provided between the third glue leakage hole 65 and the left guide portion 62.

[0063] Example 3: Right junction box

[0064] like Figure 3As shown, the right junction box includes a box body 1, which includes a box body bottom 21 and a box body side portion 22 located around the box body bottom 21. The box body bottom 21 and the box body side portion 22 together form a receiving space 3. A second glue leakage hole 64 is located between the left guide portion 62 and the left outer edge portion 5. A second connecting rib 641 is provided in the second glue leakage hole 64 along the X-axis direction. The side of the second connecting rib 641 away from the guide portion 62 is fixedly connected to the box body bottom 21, and the side of the second connecting rib 641 close to the guide portion 62 is fixedly connected to the guide portion 62. A second guide surface 641a is provided on the second connecting rib 641 to transition to the guide portion 62. A third glue leakage hole 65 is located between the right guide portion 62 and the right sidewall. A third guide surface 65a is provided between the third glue leakage hole 65 and the right guide portion 62 to transition to the right guide portion 62.

[0065] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A photovoltaic junction box, characterized in that: The invention comprises a box body (1), wherein the box body (1) comprises a box body bottom (21) and a box body side portion (22) located around the box body bottom (21), wherein the box body bottom (21) and the box body side portion (22) together constitute an accommodating space (3), wherein a bypass protection module (4) is arranged in the accommodating space (3), and wherein the box body bottom (21) comprises an outer edge portion (5) located on both sides and a recessed portion (6) located between the outer edge portions (5) on both sides and recessed toward the accommodating space (3), wherein the recessed portion (6) is provided with one or more busbar perforations (61).

2. A photovoltaic junction box according to claim 1, characterized in that: A guide portion (62) is provided between the busbar through-hole (61) and the end surface of the recessed portion (6), and the guide portion (62) extends obliquely from the end surface of the recessed portion (6) toward the accommodating space (3) to the edge of the busbar through-hole (61).

3. A photovoltaic junction box according to claim 2, characterized in that: Guide portions (62) are provided on both sides of the busbar through-hole (61), and the horizontal distances between the guide portions (62) on both sides and the busbar through-hole (61) gradually decrease from bottom to top.

4. The photovoltaic junction box according to claim 2, wherein: A glue leakage hole is provided on the side of the guide portion (62) away from the busbar perforation (61), and the length of the glue leakage hole along the Y-axis direction is greater than the width of the bypass protection module (4).

5. The photovoltaic junction box according to claim 4, characterized in that: The glue leakage hole is a second glue leakage hole (64) located between the guide portion (62) and the outer edge portion (5) or a third glue leakage hole (65) located between the guide portion (62) and the side portion (22) of the box body.

6. The photovoltaic junction box according to claim 5, characterized in that: A third guide surface (65a) transitioning to the guide portion (62) is provided between the end surface of the third glue leakage hole (65) close to one end of the guide portion (62) and the guide portion (62).

7. The photovoltaic junction box according to claim 4, characterized in that: At least two busbar perforations (61) are provided, and a first glue leakage hole (63) is provided between two adjacent busbar perforations (61).

8. The photovoltaic junction box according to claim 7, characterized in that: A first connecting rib (631) is provided in the first glue leakage hole (63), the first connecting rib (631) is provided along the X-axis direction, both ends of the first connecting rib (631) are respectively connected to the guide portion (62), and a first guiding surface (631a) is provided on the first connecting rib (631) for transition to the guide portion (62).

9. The photovoltaic junction box according to claim 5, characterized in that: A second connecting rib (641) is provided in the second glue leakage hole (64) along the X-axis direction. The side of the second connecting rib (641) away from the guide portion (62) is fixedly connected to the bottom (21) of the box body, and the side of the second connecting rib (641) close to the guide portion (62) is fixedly connected to the guide portion (62). A second guiding surface (641a) transitioning to the guiding portion (62) is provided on the second connecting rib (641).

10. The photovoltaic junction box according to claim 9, characterized in that: A gap (621) or a through-hole (622) is provided in the guide portion (62) along the Y-axis direction, the length of the gap (621) along the Y-axis direction is smaller than the length of the busbar through-hole (61) along the Y-axis direction, and the second connecting rib (641) is suspended in the gap (621) on one side close to the guide portion (62).

Images