Photovoltaic junction box and photovoltaic power generation system with same

Abstract

The utility model discloses a photovoltaic junction box and a photovoltaic power generation system with the same, the photovoltaic junction box comprises a shell, the shell is internally provided with an installation space, the edge of one side of a bottom plate of the shell facing the installation space is provided with at least one convex rib, the convex rib extends along the circumferential direction of the bottom plate, and the convex rib is provided with a plurality of convex ribs. An access port is formed in the shell, one end of a cable is suitable for extending into the installation space through the access port, and a sealing piece is arranged between the inner wall face of the access port and the cable. According to the photovoltaic junction box provided by the utility model, the waterproof performance of the photovoltaic junction box is improved due to the arrangement of the sealing element.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaics, in particular to a photovoltaic junction box and a photovoltaic power generation system having the same. Background Art

[0002] Traditional photovoltaic junction boxes are generally used in Gobi, mountains, plains, water (ponds, inland rivers), commercial roofs, residential roofs, etc. As policies become stricter, the land resources available for photovoltaic projects are becoming less and less. However, China has a long and narrow coastline with rich and suitable resources. At the same time, the demand for electricity in coastal areas is strong. Offshore photovoltaics can solve these problems. However, the offshore environment is more severe, with high temperature and humidity, which requires higher waterproof performance for photovoltaic junction boxes. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to provide a photovoltaic junction box, wherein the setting of the sealing member improves the waterproof performance of the photovoltaic junction box.

[0004] Another object of the present invention is to provide a photovoltaic power generation system using the photovoltaic junction box.

[0005] According to the photovoltaic junction box of the first embodiment of the utility model, it includes: a shell, the shell has an installation space, the bottom plate of the shell is provided with at least one rib on one side edge facing the installation space, the rib extends along the circumference of the bottom plate, an access port is formed on the shell, one end of the cable is suitable for extending into the installation space through the access port, and a sealing member is provided between the inner wall surface of the access port and the cable.

[0006] According to the photovoltaic junction box of the first embodiment of the utility model, by providing a seal, the seal fills the gap between the outer peripheral surface of the cable and the inner wall surface of the access port, thereby reducing the probability of water vapor penetrating into the installation space from the access port, and improving the waterproof performance of the photovoltaic junction box. In addition, the seal is easy to use, which is conducive to the assembly of the photovoltaic junction box and has low cost. In addition, by providing the ribs, the distance from the water vapor to the components in the installation space is increased, thereby increasing the creepage distance, and further improving the waterproof performance of the photovoltaic junction box.

[0007] According to some embodiments of the present invention, an installation groove is formed on the inner wall surface of the access port, the sealing member is disposed in the installation groove, and the side of the sealing member facing the cable is in contact with the cable.

[0008] According to some embodiments of the present invention, the sealing member extends along the circumference of the inner wall surface of the access port.

[0009] According to some embodiments of the present invention, there are multiple convex ribs, and the multiple convex ribs are arranged at intervals along the edge of the bottom plate toward the center of the bottom plate.

[0010] According to some embodiments of the present invention, one end of the convex rib is adjacent to the access port, and the other end of the convex rib first extends along the length direction of the shell toward a side away from the access port, and then extends along the width direction of the shell.

[0011] According to some embodiments of the utility model, the photovoltaic junction box further includes: a conductor, which is arranged in the installation space, and the one end of the cable is electrically connected to the conductor; a plurality of diodes, which are arranged in the installation space, one end of the diode is connected to the base plate, and the other end of the diode passes through the conductor and extends along the height direction of the shell.

[0012] According to some embodiments of the utility model, the minimum distance between the lower surface of the conductor and the bottom plate is d1, wherein d1 satisfies: 4.8mm≤d1≤5.2mm; and / or, the minimum distance between the other end of the diode and the side of the top wall of the shell facing the installation space is d2, wherein d2 satisfies: 3.0mm≤d2≤3.9mm.

[0013] According to some embodiments of the present invention, a minimum distance between a side surface of the conductor facing the access port and the access port is d3, wherein d3 satisfies: 11 mm≤d3≤15 mm.

[0014] According to some embodiments of the present invention, a plurality of grooves are formed at the edge of a side surface of the base plate away from the installation space, the grooves extend along the circumference of the base plate, and the plurality of grooves are arranged at intervals along the edge of the base plate toward the center of the base plate.

[0015] According to some embodiments of the present invention, a first opening is formed on the bottom plate, and a minimum distance between an edge of the first opening and an edge of the shell along a width direction of the shell is d4, wherein d4 satisfies: 6.25mm≤d4≤7.5mm.

[0016] A photovoltaic power generation system according to an embodiment of the second aspect of the utility model comprises the photovoltaic junction box according to the embodiment of the first aspect.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1 is a schematic diagram of a photovoltaic junction box according to an embodiment of the utility model;

[0020] Figure 2 is a cross-sectional view of a photovoltaic junction box according to an embodiment of the utility model;

[0021] Figure 3 is an internal schematic diagram of a photovoltaic junction box according to an embodiment of the utility model;

[0022] Figure 4 is a partial schematic diagram of the interior of a photovoltaic junction box according to an embodiment of the utility model, wherein the conductor is not shown;

[0023] Figure 5 is a schematic diagram of a photovoltaic junction box from another angle according to an embodiment of the utility model;

[0024] Figure 6 is a bottom view of a photovoltaic junction box according to an embodiment of the utility model;

[0025] Figure 7 It is a cross-sectional view of the photovoltaic junction box according to another embodiment of the utility model.

[0026] Reference numerals:

[0027] 100. Photovoltaic junction box; 200. Cable;

[0028] 1. Shell; 11. Installation space; 12. Bottom plate; 121. Raised rib;

[0029] 122. groove; 123. first opening; 124. second opening;

[0030] 13. Access port; 131. Mounting slot; 14. Matching portion;

[0031] 2. Seal; 3. Conductor; 4. Diode. DETAILED DESCRIPTION

[0032] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Figure 1-Figure 7 A photovoltaic junction box 100 according to an embodiment of the present invention is described.

[0033] like Figure 1-Figure 3 As shown, the photovoltaic junction box 100 according to the first embodiment of the utility model includes a shell 1.

[0034] Specifically, the shell 1 has an installation space 11, and at least one rib 121 is provided on the edge of the side of the bottom plate 12 of the shell 1 facing the installation space 11, and the rib 121 extends along the circumference of the bottom plate 12. An access port 13 is formed on the shell 1, and one end of the cable 200 is suitable for extending into the installation space 11 through the access port 13. A seal 2 is provided between the inner wall surface of the access port 13 and the cable 200.

[0035] For example, in Figure 1-Figure 4 In the example, a convex rib 121 protruding upward is provided on the bottom wall of the housing 1. Therefore, when water vapor or liquid penetrates from the top of the housing 1 along the side wall of the housing 1 into the installation space 11, the convex rib 121 increases the distance for the water vapor to flow to the components in the installation space 11, thereby increasing the creepage distance and improving the waterproof performance of the photovoltaic junction box 100. Figure 1-Figure 4 , the access port 13 can be formed on the side wall of the shell 1, and the access port 13 is connected to the installation space 11. When the photovoltaic junction box 100 is connected to the cable 200, the above-mentioned one end of the cable 200 can extend from the access port 13 into the installation space 11 and connect with the conductor 3, so as to facilitate the electrical connection of the photovoltaic junction box 100. In addition, by providing the seal 2, the seal 2 fills the gap between the outer peripheral surface of the cable 200 and the inner wall surface of the access port 13, thereby reducing the probability of water vapor penetrating into the installation space 11 from the access port 13, and further improving the waterproof performance of the photovoltaic junction box 100. In addition, the seal 2 is easy to use, which is conducive to the assembly of the photovoltaic junction box 100 and has low cost of use.

[0036] It should be noted that when the photovoltaic junction box 100 is in use, after the photovoltaic junction box 100 is connected to the cable 200, the installation space 11 is filled with potting glue, that is, the potting glue is filled in the installation space 11. After a certain period of time, the potting glue solidifies to improve the waterproof insulation performance of the photovoltaic junction box 100.

[0037] According to the photovoltaic junction box 100 of the first embodiment of the utility model, by providing a seal 2, the seal 2 fills the gap between the outer peripheral surface of the cable 200 and the inner wall surface of the access port 13, thereby reducing the probability of water vapor penetrating into the installation space 11 from the access port 13, and improving the waterproof performance of the photovoltaic junction box 100. In addition, the seal 2 is easy to use, which is conducive to the assembly of the photovoltaic junction box 100 and has low use cost. In addition, by providing the rib 121, the distance for water vapor to flow to the components in the installation space 11 is increased, thereby increasing the creepage distance and further improving the waterproof performance of the photovoltaic junction box 100.

[0038] According to some embodiments of the present invention, Figure 2The inner wall surface of the access port 13 is formed with an installation groove 131, the sealing member 2 is arranged in the installation groove 131, and the side of the sealing member 2 facing the cable 200 is in contact with the cable 200. Figure 2 In the example, the housing 1 has a mating portion 14, which extends from the housing 1 toward a direction away from the center of the installation space 11, and an access port 13 is formed on the mating portion 14. The access port 13 is formed along the length direction of the housing 1 (for example, Figure 1 The mounting groove 131 (in the direction indicated by the arrow A) penetrates the inner wall of the shell 1 and the free end surface of the matching part 14, and a mounting groove 131 is formed on the inner peripheral wall of the matching part 14, and the sealing member 2 is clamped between the inner wall surface of the mounting groove 131 and the outer peripheral surface of the cable 200. The side of the sealing member 2 facing the cable 200 can be in a contact, fit or squeezed and pressed state with the cable 200. For example, the sealing member 2 can be interference fit between the cable 200 and the access port 13. Therefore, the provision of the mounting groove 131 is conducive to the installation and positioning of the sealing member 2, and improves the installation efficiency. In addition, it also has a limiting effect on the sealing member 2, avoiding the movement of the sealing member 2 relative to the cable 200 or the shell 1, so as to ensure the sealing and waterproof performance of the sealing member 2, thereby improving the performance of the photovoltaic junction box 100.

[0039] According to some embodiments of the present invention, the seal 2 extends along the circumference of the inner wall of the access port 13. For example, the circumferential extension includes the seal 2 being an annular seal ring, the seal 2 being sleeved on the outer circumference of the cable 200, or the seal 2 being an arc-shaped structure, so as to improve the sealing performance of a part of the access port 13. For example, in Figure 2 In the example, the seal 2 is annular to improve the circumferential sealing performance of the access port 13, thereby preventing water vapor from penetrating from the access port 13 to a large extent, and extending the service life of the photovoltaic junction box 100.

[0040] According to some embodiments of the present invention, Figure 3 and Figure 4 There are multiple ribs 121, and the multiple ribs 121 are arranged at intervals along the edge of the bottom plate 12 toward the center of the bottom plate 12. In the description of the utility model, the meaning of "multiple" is two or more. For example, in Figure 3 and Figure 4 In the example of FIG. 1 , the width direction of the bottom plate 12 (eg, Figure 1 There are two convex ribs 121 on one side (in the direction indicated by the arrow B in the middle), and both convex ribs 121 are arranged near the edge of the bottom plate 12. When water vapor penetrates into the installation space 11 from between the potting glue and the inner wall surface of the shell 1, the penetration path of the water vapor is roughly as follows: Figure 7As shown by the dashed line in the middle. Thus, by providing a plurality of ribs 121, when there is one rib 121, the creepage distance is approximately 18.5 mm. After adding one rib 121, the creepage distance increases to 23 mm, an increase of 24%, further improving the waterproof performance of the photovoltaic junction box 100. Moreover, when there are two ribs 121, the ribs 121 occupy a smaller space in the installation space 11, which is conducive to the arrangement of components such as conductive parts in the installation space 11. In addition, the ribs 121 have a simple structure and low processing cost, and the production cost of the photovoltaic junction box 100 is also low.

[0041] Optionally, a plurality of ribs 121 are provided on both sides of the bottom plate 12 in the width direction. Figure 3 and Figure 4 In the example, two convex ribs 121 are respectively provided on both sides of the width direction of the bottom plate 12, and the convex ribs 121 on both sides are arranged symmetrically about the axis of the length direction of the housing 1. Therefore, when water vapor penetrates from either side of the width direction of the housing 1, the creepage distance is increased, so as to further improve the waterproof performance of the photovoltaic junction box 100.

[0042] According to some embodiments of the present invention, referring to Figure 3 and Figure 4 One end of the rib 121 is adjacent to the access port 13, and the other end of the rib 121 first extends along the length direction of the housing 1 toward a side away from the access port 13, and then extends along the width direction of the housing 1. Figure 3 and Figure 4 In the example, each rib 121 is roughly L-shaped. As a result, the contact area between the rib 121 and the bottom plate 12 is increased, so that the water vapor that penetrates into the installation space 11 from various circumferential locations of the top of the shell 1 is not easy to flow to the conductive parts and other components. The rib 121 can block the flow of water vapor from various circumferential locations of the shell 1, and the creepage distance at various locations is increased. In addition, the rib 121 has a simple structure and low production difficulty, which reduces the production difficulty of the photovoltaic junction box 100.

[0043] According to some embodiments of the present invention, Figure 2 and Figure 3 The photovoltaic junction box 100 further includes a conductor 3 and a plurality of diodes 4. The conductor 3 is disposed in the installation space 11. The above-mentioned one end of the cable 200 is electrically connected to the conductor 3. The diode 4 is disposed in the installation space 11. One end of the diode 4 is connected to the bottom plate 12. The other end of the diode 4 passes through the conductor 3 along the height direction of the housing 1 (for example, Figure 1 The inner surface of the housing extends in the direction indicated by the arrow C).

[0044] For example, in Figure 3 and Figure 4In the example, four diodes 4 are provided, and the four diodes 4 are respectively close to the four corners in the housing 1. The lower end of each diode 4 is connected to the bottom plate 12, and the upper end of the diode 4 extends through the conductor 3 toward the top of the housing 1, and the conductor 3 is provided on the four diodes 4. The right end of the cable 200 is electrically connected to the conductor 3, and the left end of the cable 200 extends from the access port 13 to the outside of the housing 1. Thus, the conductor 3 can be connected to external components through the cable 200 to realize the connection between the photovoltaic junction box 100 and other components. In addition, the diode 4 also has a supporting effect on the conductor 3, so that the conductor 3 can be stably installed in the housing 1, thereby improving the stability of the use and installation of the conductor 3.

[0045] According to some embodiments of the present invention, Figure 7 , the minimum distance between the lower surface of the conductor 3 and the bottom plate 12 is d1, where d1 satisfies: 4.8 mm ≤ d1 ≤ 5.2 mm. And / or, the minimum distance between the other end of the diode 4 and the side of the top wall of the housing 1 facing the installation space 11 is d2, where d2 satisfies: 3.0 mm ≤ d2 ≤ 3.9 mm.

[0046] The lower surface of the conductor 3 mentioned above refers to the lower side surface where the conductor 3 and the diode 4 cooperate. For example, when the vertical distance between the lower surface of the conductor 3 and the upper surface of the bottom plate 12 is less than 4.8 mm, the distance is small, and there is no rush to fill the potting glue at the position between the bottom plate 12 and the conductor 3, and the creepage distance is reduced, which reduces the waterproof performance of the photovoltaic junction box 100. When the vertical distance between the lower surface of the conductor 3 and the upper surface of the bottom plate 12 is greater than 5.2 mm, the distance between the conductor 3 and the bottom plate 12 is large, thereby increasing the height of the shell 1 and increasing the volume of the photovoltaic junction box 100. Therefore, the minimum distance d1 between the lower surface of the conductor 3 and the bottom plate 12 is set to meet 4.8 mm ≤ d1 ≤ 5.2 mm, and the distance between the lower surface of the conductor 3 and the upper surface of the bottom plate 12 is moderate. While increasing the creepage distance, the photovoltaic junction box 100 can also be made more compact.

[0047] For example, when the vertical distance between the upper end of the diode 4 and the lower surface of the top wall of the housing 1 is less than 3.0 mm, the gap between the upper end face of the diode 4 and the top wall of the housing 1 is small, and the potting glue is not easy to cover the upper end of the diode 4 after filling the installation space 11, which is not conducive to the insulation of the photovoltaic junction box 100. When the vertical distance between the upper end of the diode 4 and the lower surface of the top wall of the housing 1 is greater than 3.9 mm, the upper space of the upper end of the diode 4 is large, the height of the housing 1 is large, the volume of the housing 1 is increased, and it is not convenient to install the photovoltaic junction box 100. Therefore, it is set to make the minimum distance d2 between the other end of the diode 4 and the side of the top wall of the housing 1 facing the installation space 11 meet 3.0 mm ≤ d2 ≤ 3.9 mm, the height of the space above the diode 4 is moderate, and the potting glue can cover the upper end of the diode 4. At the same time, the volume of the housing 1 is also moderate, which is conducive to the installation and use of the photovoltaic junction box 100. For example, the height of the photovoltaic junction box 100 of the present application is increased from the conventional 17.1 mm to 18 mm. Figure 7 The creepage distance shown by the dotted line in the middle increases from 18.5mm to 23mm, with significant effects.

[0048] According to some embodiments of the present invention, Figure 2 , the minimum distance between the side surface of the conductor 3 facing the access port 13 and the access port 13 is d3, wherein d3 satisfies: 11mm≤d3≤15mm. The above-mentioned d3 also refers to the length of the cable 200 penetrating into the installation space 11. The length of the conventional cable 200 extending into the housing 1 is 11mm. By increasing the length of the cable 200 extending into the housing 1, the creepage distance at the position of the cable 200 is increased, which is 36% longer when increased to 15mm, further improving the waterproof performance at the access port 13 and improving the performance of the photovoltaic junction box 100. At the same time, it can also ensure that the volume of the photovoltaic junction box 100 is moderate and avoid being too large, which is conducive to the installation and use of the photovoltaic junction box 100.

[0049] According to some embodiments of the present invention, Figure 5 and Figure 6 A plurality of grooves 122 are formed at an edge of a side surface of the bottom plate 12 away from the installation space 11 . The grooves 122 extend along the circumference of the bottom plate 12 . The plurality of grooves 122 are arranged at intervals along the edge of the bottom plate 12 toward the center of the bottom plate 12 .

[0050] For example, in Figure 5 and Figure 6In the example, a groove 122 is formed on the lower surface of the base plate 12, and two grooves 122 are formed, and the two grooves 122 are arranged inwardly along the edge of the base plate 12. Each groove 122 extends along the circumference of the base plate 12, and the shape of the groove 122 is adapted to the shape of the base plate 12. Except for the side adjacent to the access port 13, grooves 122 are formed on the edges of the other sides of the base plate 12. When installing the photovoltaic junction box 100, the adhesive can be first applied to the groove 122, and then the photovoltaic junction box 100 is installed at the designated position. Therefore, by providing a plurality of grooves 122, the contact area between the base plate 12 and the bonding position is increased, thereby increasing the bonding stability of the photovoltaic junction box 100, which is conducive to the long-term and stable use of the photovoltaic junction box 100. In addition, when water vapor penetrates inward from the edge of the base plate 12, the provision of the groove 122 also increases the infiltration flow path of the water vapor, lengthens the creepage distance, and reduces the probability of water vapor penetration. For example, the creepage distance (for example, water vapor from Figure 6 The distance from the edge of one side of the width to the second opening 124 is increased from the traditional 10.4mm to 15mm, which is 44% longer.

[0051] According to some embodiments of the present invention, Figure 5 and Figure 6 , a first opening 123 and a second opening 124 are formed on the bottom plate 12, the first opening 123 is located between the second opening 124 and the access port 13, and the minimum distance between the edge of the first opening 123 and the edge of the shell 1 along the width direction of the shell 1 is d4, wherein d4 satisfies: 6.25mm≤d4≤7.5mm. It should be noted that d4 can also be expressed as the minimum glue retention width. When d4 is less than 6.25mm, the distance between the first opening 123 and the edge of the bottom plate 12 is small, so that the width of the shell 1 is small, and the position for applying the adhesive can also be reduced, which reduces the bonding stability of the photovoltaic junction box 100. When d4 is greater than 7.5mm, the width of the shell 1 increases, which increases the volume of the shell 1, which is not conducive to the installation and use of the photovoltaic junction box 100. Therefore, by setting d4 to satisfy 6.25mm≤d4≤7.5mm, the width of the shell 1 is moderate (for example, the width is increased to 36mm), which is conducive to the application of the adhesive and the installation of the photovoltaic junction box 100. In addition, the moving distance of water vapor from the edge of the housing 1 along the width direction of the housing 1 to the first opening 123 is increased, further improving the waterproof performance of the photovoltaic junction box 100.

[0052] A photovoltaic power generation system (not shown) according to an embodiment of the second aspect of the utility model comprises a photovoltaic junction box 100 according to the embodiment of the first aspect.

[0053] According to the photovoltaic power generation system of the embodiment of the utility model, by adopting the photovoltaic junction box 100, the waterproof performance of the photovoltaic power generation system is improved, the use performance is improved, and the service life is extended.

[0054] Other structures and operations of the photovoltaic junction box 100 and the photovoltaic power generation system according to the embodiment of the utility model are known to those skilled in the art and will not be described in detail here.

[0055] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0056] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example.

[0057] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A photovoltaic junction box, characterized in that: include: A shell having an installation space therein, at least one rib is provided on one side edge of a bottom plate of the shell facing the installation space, the rib extends along the circumference of the bottom plate, an access port is formed on the shell, one end of the cable is suitable for extending into the installation space through the access port, and a sealing member is provided between the inner wall surface of the access port and the cable.

2. The photovoltaic junction box according to claim 1, characterized in that: An installation groove is formed on the inner wall surface of the access port, the sealing member is arranged in the installation groove, and the side surface of the sealing member facing the cable contacts the cable.

3. The photovoltaic junction box according to claim 1, characterized in that: The sealing member extends along a circumferential direction of an inner wall surface of the access port.

4. The photovoltaic junction box according to claim 1, characterized in that: There are multiple convex ribs, and the multiple convex ribs are arranged at intervals along the edge of the bottom plate toward the center of the bottom plate.

5. The photovoltaic junction box according to claim 4, characterized in that: One end of the convex rib is adjacent to the access port, and the other end of the convex rib first extends along the length direction of the shell toward a side away from the access port, and then extends along the width direction of the shell.

6. The photovoltaic junction box according to claim 1, characterized in that: Further including: A conductor, the conductor being disposed in the installation space, and the one end of the cable being electrically connected to the conductor; A plurality of diodes are arranged in the installation space, one end of the diode is connected to the bottom plate, and the other end of the diode passes through the conductor and extends along the height direction of the shell.

7. The photovoltaic junction box according to claim 6, characterized in that: The minimum distance between the lower surface of the conductor and the bottom plate is d1, wherein d1 satisfies: 4.8 mm ≤ d1 ≤ 5.2 mm; and / or A minimum distance between the other end of the diode and a side of the top wall of the housing facing the installation space is d2, wherein d2 satisfies: 3.0 mm≤d2≤3.9 mm.

8. The photovoltaic junction box according to claim 6, characterized in that: The minimum distance between the side surface of the conductor facing the access port and the access port is d3, wherein d3 satisfies: 11 mm≤d3≤15 mm.

9. The photovoltaic junction box according to claim 1, characterized in that: A plurality of grooves are formed at an edge of a side surface of the bottom plate away from the installation space. The grooves extend along the circumference of the bottom plate. The plurality of grooves are arranged at intervals along the edge of the bottom plate toward the center of the bottom plate.

10. The photovoltaic junction box according to any one of claims 1 to 9, characterized in that: A first opening is formed on the bottom plate, and a minimum distance between an edge of the first opening and an edge of the shell along a width direction of the shell is d4, wherein d4 satisfies: 6.25 mm≤d4≤7.5 mm.

11. A photovoltaic power generation system, characterized in that: It comprises the photovoltaic junction box according to any one of claims 1-10.

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