Photovoltaic junction box

Abstract

The utility model provides a photovoltaic junction box, relates to the field of photovoltaic technology, and aims to solve the technical problem that a photovoltaic junction box on a photovoltaic assembly is difficult to disassemble when being repaired. The photovoltaic junction box comprises a box body and a box cover, wherein the box body comprises a first part and a second part which are detachably connected; the first part is provided with a first wall plate, and the second part is provided with a second wall plate opposite to the first wall plate; slots are formed in the end surfaces, facing the box cover, of the first wall plate and the second wall plate; the box cover comprises a cover plate and two insertion plates arranged on the cover plate, the cover plate is provided with a via hole, one of the two insertion plates penetrates through the via hole and is inserted into the insertion groove of the first wall plate, and the other insertion plate is inserted into the insertion groove of the second wall plate; the first wall plate is provided with a through hole penetrating through the slot and communicating the inner wall and the outer wall of the first wall plate. The photovoltaic junction box is provided with a detachable structure, so that the photovoltaic junction box is more convenient to disassemble when being repaired after being damaged.

Description

TECHNICAL FIELD

[0001] The utility model relates to photovoltaic technology field especially relates to a photovoltaic junction box. BACKGROUND

[0002] The statements in this section merely provide background information related to the utility model and do not necessarily constitute the prior art.

[0003] The photovoltaic junction box is an indispensable part of the photovoltaic module, which is a protection device and also a device interconnected with the outside world, and can solve the safety problem of the photovoltaic module under hot spot and the output problem of direct current.

[0004] After the photovoltaic module is installed in the power station, the junction box will be damaged due to virtual welding, lightning and other reasons during use and needs to be repaired. In the related art, the junction box needs to be repaired, and the worker uses a blade to disassemble the junction box and the photovoltaic module. During the disassembly process, excessive force or improper operation is easy to break the lead-out wire; at the same time, the longer the curing time of the silica gel filled in the photovoltaic junction box, the more difficult it is to disassemble with the blade. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a photovoltaic junction box to solve the technical problem that the photovoltaic junction box on the photovoltaic module is difficult to disassemble when repaired.

[0006] In order to achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0007] The utility model provides a photovoltaic junction box, including box body and box cover, the box body includes the first part and the second part of detachable connection;

[0008] The first part has a first wallboard, and the second part has a second wallboard opposite to the first wallboard;The end face of the first wallboard and the second wallboard towards the box cover is formed with a slot;

[0009] The box cover includes a cover plate and two plug-in plates provided on the cover plate, the cover plate has a through hole, one of the two plug-in plates is inserted into the slot of the first wallboard through the through hole, and the other is inserted into the slot of the second wallboard;

[0010] The first wallboard has a through hole penetrating through the slot and communicating the inner wall and the outer wall of the first wallboard.

[0011] According to at least one embodiment of the utility model, the photovoltaic junction box further includes a threading part, and recesses are respectively formed in the opposite two side faces of the threading part;

[0012] The first part has a first side wall panel and a second side wall panel disposed at both ends of the first wall panel; the second part has a third side wall panel and a fourth side wall panel disposed at both ends of the second wall panel;

[0013] The second side wall panel and the fourth side wall panel are connected by a snap-fit ​​structure;

[0014] At least a portion of the first sidewall panel and at least a portion of the third sidewall panel are respectively disposed in the two grooves.

[0015] According to at least one embodiment of the present invention, a portion of the snap-fit ​​structure is located on the outer wall of the second side wall panel, and another portion is located on the outer wall of the fourth side wall panel.

[0016] According to at least one embodiment of the present invention, the photovoltaic junction box further includes a diode module, which is detachably disposed within the box body.

[0017] According to at least one embodiment of the present invention, the first part has a first bottom wall plate disposed at the bottom end of the first wall plate, and the second part has a second bottom wall plate disposed at the bottom end of the second wall plate. Stepped grooves are respectively formed on the opposite end faces of the first bottom wall plate and the second bottom wall plate. The diode module includes a substrate, and the two sides of the substrate are respectively engaged in the two stepped grooves.

[0018] According to at least one embodiment of the present invention, the diode module further includes a diode, a plurality of fixing posts and at least one support portion disposed on the substrate;

[0019] The diode is mounted on the fixed post and located above the support.

[0020] According to at least one embodiment of the present invention, the diode module further includes a plurality of hooks disposed on the substrate, the hooks being engaged with the diode on the surface opposite to the substrate;

[0021] At least two of the plurality of hooks are located on opposite sides of the diode.

[0022] According to at least one embodiment of the present invention, the distance between the diode and the cover plate is greater than or equal to the distance between the through hole and the cover plate.

[0023] According to at least one embodiment of the present invention, the cable threading member has a cable threading groove for cable to pass through, and the cable threading member further includes a pressure block, which is embedded in the groove of the cable threading groove.

[0024] According to at least one embodiment of the utility model, the photovoltaic junction box further includes a wire clamping groove, and the wire clamping groove is arranged on the outer wall of the second wall plate.

[0025] In one or more of the technical solutions provided in the exemplary embodiments of the utility model, at least one of the following beneficial effects can be achieved.

[0026] The photovoltaic junction box in the exemplary embodiments of the utility model is composed of a box body and a box cover. The box body is formed by a first part and a second part which can be disassembled. The box cover is formed by a cover plate and two plug-in plates arranged on the cover plate. The two plug-in plates can be inserted into the insertion slots of the first wall plate and the second wall plate, so that the cover plate is arranged on the box body through the two plug-in plates. Specifically, the cover plate has a through hole, and one of the two plug-in plates can pass through the through hole and be inserted into the insertion slot of the first wall plate. Therefore, when the photovoltaic junction box on the photovoltaic module needs to be repaired and disassembled, the plug-in plate in the through hole of the cover plate can be removed from the box body, and the box body can be removed by disassembling the first part and the second part of the box body. Compared with the junction box in the prior art which cannot be disassembled and needs a blade to separate the junction box from the photovoltaic module, the photovoltaic junction box in the exemplary embodiments of the utility model has higher disassembly stability and higher working efficiency, and can also avoid the situation that the middle hole position of the back glass is stressed unevenly and the lead-out cable is broken during the repair process.

[0027] Further, a through hole penetrating through the first wall plate is arranged on the first wall plate, and the through hole is located at the position of the insertion slot of the first wall plate. Therefore, after the repair and disassembly of the junction box are completed, the potting glue can be filled in the box body at the through hole, and the potting glue can be prevented from flowing out after the plug-in plate is inserted into the insertion slot of the first wall plate. BRIEF DESCRIPTION OF DRAWINGS

[0028] The accompanying drawings illustrate exemplary embodiments of the utility model, and together with the description thereof, serve to explain the principle of the utility model. These drawings are included to provide a further understanding of the utility model, and are part of the specification;

[0029] Figure 1 is an axonometric structural schematic view of the photovoltaic junction box according to the embodiment of the utility model;

[0030] Figure 2 is a three-dimensional exploded structural schematic view of the photovoltaic junction box according to the embodiment of the utility model;

[0031] Figure 3 is an axonometric structural schematic view of the box body and the diode module according to the embodiment of the utility model;

[0032] Figure 4 is a three-dimensional exploded structural schematic view of the box body and the diode module according to the embodiment of the utility model;

[0033] Figure 5 This is a three-dimensional exploded view of the box lid according to an embodiment of the present utility model.

[0034] Figure 6 This is an isometric structural diagram of a diode module (without diodes) according to an embodiment of the present invention;

[0035] Figure 7 This is an isometric structural schematic diagram of a photovoltaic junction box according to an embodiment of the present invention from another perspective.

[0036] Figure label:

[0037] 11. First part; 110. First wall panel; 111. First side wall panel; 112. Second side wall panel; 113. Through hole; 12. Second part; 120. Second wall panel; 123. Third side wall panel; 124. Fourth side wall panel; 125. Second bottom wall panel; 126. Stepped groove;

[0038] 21. Substrate; 211. Fixing post; 212. Hook; 213. Support; 22. Diode;

[0039] 31. Cover plate; 311. Through hole; 32. Insert plate; 33. Slot;

[0040] 40. Cable; 41. Cable tray;

[0041] 51. Buckle; 52. Slot;

[0042] 60. Threading component; 61. Threading groove; 62. Pressing block; 63. Groove. Detailed Implementation

[0043] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0044] During the operation of a photovoltaic power station, the photovoltaic junction box of the photovoltaic module may be damaged due to the following reasons: poor soldering during the welding of the photovoltaic junction box, failure of the diode due to lightning strikes, and problems with the junction box itself during the circulation of photovoltaic modules within the factory. In related technologies, when removing the photovoltaic junction box from the photovoltaic module for repair, a blade is used to remove the junction box. However, excessive force or improper operation during the removal process can easily cut the cables leading out of the photovoltaic junction box.

[0045] To solve the above problems, the utility model exemplary embodiments provide photovoltaic junction box uses split type's box cover and box body, when the repair dismantles, need not use blade, can improve work efficiency and dismantling reliability.

[0046] Figure 1 is the axonometric structure schematic diagram of photovoltaic junction box according to the embodiment of the utility model, Figure 4 is the three-dimensional exploded structure schematic diagram of box body and diode module according to the embodiment of the utility model, Figure 5 is the three-dimensional exploded structure schematic diagram of box cover according to the embodiment of the utility model. Figure 1 、 Figure 4 and Figure 5 As shown in the utility model exemplary embodiments provide photovoltaic junction box, including box body and box cover, box body includes the first part 11 and the second part 12 of detachable connection;The first part 11 has first wallboard 110, and the second part 12 has the second wallboard 120 opposite to first wallboard 110;The end face of first wallboard 110, second wallboard 120 towards box cover is formed with slot 33;Box cover includes cover plate 31 and is arranged in the two inserts 32 of cover plate 31, and cover plate 31 has via 311, and one of two inserts 32 is inserted in the slot 33 of first wallboard 110 through via 311, and the other is inserted in the slot 33 of second wallboard 120;First wallboard 110 has through slot 33 and is communicated with the inner wall and outer wall through hole 113 of first wallboard 110.

[0047] In practical application, the box body of photovoltaic junction box is combined together by the first part 11 and the second part 12 through detachable connection, and the first part 11 and the second part 12 are connected and split through snap structure exemplarily.

[0048] Box cover is covered on box body to form a substantially closed accommodating space, specifically, the box cover includes a cover plate 31 and two opposite inserts 32 arranged on the cover plate 31. Correspondingly, the top end of the first wallboard 110 of the first part 11 and the top end of the second wallboard 120 of the second part 12 are both provided with a slot 33 for inserting the insert 32. When the cover plate 31 is covered on the first part 11 and the second part 12, the two inserts 32 are respectively inserted into the two slots 33, and the insert 32 is partially connected to the cover plate 31 and partially connected to the first wallboard 110 or the second wallboard 120, so as to detachably connect the cover plate 31 to the box body.

[0049] In some embodiments, one insert 32 is fixedly arranged on the cover plate 31, and the other insert 32 is detachably arranged on the cover plate 31 through the via 311 on the cover plate 31. When the cover plate 31 is covered on the box body, the detachable insert 32 is penetrated through the via 311 and partially inserted into the slot 33 of the first wallboard 110 to form a connection.

[0050] In some other embodiments, both of the two plug-in plates 32 can be detachably arranged on the cover plate 31, that is, the cover plate 31 has two through holes 311, and when the cover plate 31 is arranged on the box body, the two plug-in plates 32 are respectively inserted from the corresponding through holes 311 and the respective parts are inserted into the insertion slots 33 of the first wall plate 110 and the second wall plate 120 to form the connection.

[0051] The box body of the photovoltaic junction box provided in the exemplary embodiments of the utility model is of a detachable structure, the cover is also of a detachable structure and is arranged on the box body by cooperating with the insertion slot 33 and the plug-in plate 32, so that when the photovoltaic junction box needs to be removed for repair, the photovoltaic junction box can be easily separated from the photovoltaic module without using a blade to cut, the removal stability is improved, and the situation that the back glass is unevenly stressed and the lead-out cable is broken when the photovoltaic junction box is removed at the middle hole position is avoided.

[0052] Considering that the photovoltaic junction box is located at the back of the photovoltaic module, after the photovoltaic module is installed, the cover of the photovoltaic junction box faces the ground, and when the photovoltaic junction box is installed for repair, it is necessary to fill and seal glue, such as silicone, in the box body to improve the heat dissipation capacity of the photovoltaic junction box. However, the filling and sealing glue cannot be filled before the cover plate 31 is installed on the box body.

[0053] Therefore, the photovoltaic junction box provided in the exemplary embodiments of the utility model has the through hole 113 that penetrates the insertion slot 33 and communicates the inner wall and the outer wall of the first wall plate 110.

[0054] When the cover plate 31 is temporarily fixed by being inserted into the insertion slot 33 of the second wall plate 120 through one plug-in plate 32, the through hole 113 can be used to fill the silicone into the box body, and then the plug-in plate 32 is inserted into the insertion slot 33 of the first wall plate 110 through the through hole 311 on the cover plate 31, so that the cover plate 31 is completely fixed on the box body.

[0055] When the cover plate 31 is completely fixed on the box body, the distance between the bottom end of the plug-in plate 32 inserted into the insertion slot 33 of the first wall plate 110 and the top end of the first wall plate 110 is greater than the distance between the through hole 113 and the top end of the first wall plate 110, so that the plug-in plate 32 can completely cover and block the through hole 113, and the outflow of the filling and sealing glue can be avoided. Compared with the photovoltaic junction box that cannot be filled with the filling and sealing glue after repair in the prior art, the photovoltaic junction box according to the exemplary embodiments of the utility model can still be internally filled with the filling and sealing glue through the through hole 113 on the first wall plate 110 after repair, and has better heat conduction and heat dissipation capacity.

[0056] Figure 2 is a perspective exploded structural schematic view of a photovoltaic junction box according to an embodiment of the utility model; Figure 3 is an axonometric structural schematic view of a box body and a diode module according to an embodiment of the utility model. As shown inFigures 2-4 As shown, the photovoltaic junction box provided in the exemplary embodiment of this utility model also includes a wire threading member 60, and grooves 63 are respectively provided on the two opposite sides of the wire threading member 60; the first part 11 has a first side wall plate 111 and a second side wall plate 112 provided at both ends of the first wall plate 110; the second part 12 has a third side wall plate 123 and a fourth side wall plate 124 provided at both ends of the second wall plate 120; the second side wall plate 112 and the fourth side wall plate 124 are connected by a snap-fit ​​structure; at least a portion of the first side wall plate 111 and at least a portion of the third side wall plate 123 are respectively provided in the two grooves 63.

[0057] The diode 22 in the photovoltaic junction box requires cable 40 to conduct current, so cable 40 needs to be led out from the box. Cable 40 can be led out using the cable channel 61 on the cable guide 60. Cable guide 60 can be separated from the first part 11 and the second part 12 of the box to facilitate the overall disassembly of the photovoltaic junction box.

[0058] For example, the photovoltaic junction box is generally rectangular. A first side wall panel 111 and a second side wall panel 112 are formed by bending at both ends of the first wall panel 110; a third side wall panel 123 and a fourth side wall panel 124 are formed by bending at both ends of the second wall panel 120. A wiring member 60 is disposed between the first side wall panel 111 and the third side wall panel 123. The free ends of the first side wall panel 111 and the third side wall panel 123 are respectively inserted into the grooves 63 on opposite sides of the wiring member 60, thereby creating mutual restraint between the first part 11, the second part 12, and the wiring member 60. Simultaneously, the bends between the grooves 63 and the first side wall panel 111 and the third side wall panel 123 improve the creepage distance, thereby enhancing the safety of the junction box.

[0059] Meanwhile, the second side wall panel 112 and the fourth side wall panel 124 can be joined together to form a side wall of the box. The two can be connected together by a snap-fit ​​structure. The snap-fit ​​structure can be formed on the opposite end faces of the two. For example, the slot 52 is a deep groove opened in the second side wall panel 112, and it has an opening on the outer wall of the second side wall panel 112 to expose the hook of the snap-fit ​​51, which is convenient to press and release. The snap-fit ​​structure can also be located on the outer walls of the two.

[0060] For example, a slot 52 is provided on the outer wall of the second side panel 112, and a buckle 51 is provided on the outer wall of the fourth side panel 124. When it is necessary to disassemble the box, it can be disengaged from the slot 52 by pressing the buckle 51.

[0061] like Figures 2-4 As shown, the photovoltaic junction box also includes a diode module, which is detachably housed within the box. The diode module can also be separated and installed from the box body to facilitate the overall disassembly of the junction box.

[0062] Exemplarily, the first part 11 has a first bottom wall plate arranged at the bottom end of the first wall plate 110, and the second part 12 has a second bottom wall plate 125 arranged at the bottom end of the second wall plate 120; opposite end faces of the first bottom wall plate and the second bottom wall plate 125 are respectively provided with stepped grooves 126; and the diode module comprises a substrate 21, two sides of the substrate 21 are respectively clamped in the two stepped grooves 126.

[0063] The first bottom wall plate and the second bottom wall plate 125 can have the same shape and a certain spacing therebetween, and the substrate 21 of the diode module can be arranged in the spacing to form the entire bottom wall of the box with the first bottom wall plate and the second bottom wall plate 125. The inner wall and the end face of the first bottom wall plate are formed with the stepped groove 126, and the inner wall and the end face of the second bottom wall plate 125 are also formed with another stepped groove 126, and the two sides of the substrate 21 can be clamped and fixed in the two stepped grooves 126, and the path of the bending cooperation of the two stepped grooves 126 and the substrate 21 can make the creepage distance longer, increase the water vapor penetration path, and thus improve the safety of the junction box. At the same time, the stepped groove is formed on the inner wall of the bottom wall plate, which can facilitate the extraction of the diode module.

[0064] Exemplarily, the bottom of each side of the substrate 21 is formed with a stepped surface matched with the stepped groove 126 on the first bottom wall plate and the second bottom wall plate 125, and when the substrate 21 is clamped in the two stepped grooves 126, the bottom surface of the substrate 21 is flush with the bottom surface of the first bottom wall plate and the second bottom wall plate 125, as shown in Figure 7 Figure 7 is another perspective view of the photovoltaic junction box according to the embodiment of the present application.

[0065] Figure 6 is a perspective view of the diode module (without diode) according to the embodiment of the present application. As shown in Figure 6 , the diode module further comprises a diode 22 and a plurality of fixing columns 211 and at least one support part 213 arranged on the substrate 21; the diode 22 is fixed on the fixing column 211 and located above the support part 213.

[0066] Exemplarily, the diode 22 is substantially rectangular, the number of the fixing columns 211 is two, three, four or more, for example, four fixing columns 211 are respectively located at four corner positions of the diode 22, and the diode 22 is fixed on the top end of the fixing column 211 by a screw.

[0067] ​When the junction box is installed on the photovoltaic module, the busbar of the photovoltaic module passes through the busbar through hole on the base plate 21, enters the box body and is welded with the pole plate of the diode 22. During the welding process, a force needs to be applied to the diode 22 in the direction of the base plate 21. In order to avoid damage to the diode 22, two opposite support portions 213 are arranged below the diode 22 to prevent the diode 22 from being broken due to large deformation.

[0068] Exemplarily, the support portions 213 are plate-shaped and oppositely arranged, and are respectively located below the two pole plates of the diode 22. The two support portions 213 are located on the periphery of the two busbar through holes and between the four fixing columns 211.

[0069] In order to further ensure that the position of the diode 22 on the fixing column 211 does not shake, as shown in Figure 2 and Figure 6 , a plurality of clamping hooks 212 are further arranged on the base plate 21, for example, two clamping hooks 212 are respectively located on the opposite sides of the diode 22 and can be symmetrically or asymmetrically arranged with respect to the diode 22, and the two clamping hooks 212 are arranged on the surface of the diode 22 away from the base plate 21 to position the diode 22 in the height direction.

[0070] In some embodiments, the distance between the diode 22 and the cover plate 31 is greater than or equal to the distance between the through hole 113 and the cover plate 31.

[0071] In the production process of the photovoltaic module, when the junction box is installed on the photovoltaic module, a glue filling process needs to be performed on the inside of the box body. At this time, the box cover is upward and not toward the ground, and the potting glue needs to immerse the diode 22. In order to prevent the potting glue from overflowing from the through hole 113, the height of the through hole 113 is set to be higher than the height of the diode 22.

[0072] As shown in Figures 3-4 , Figure 7 , the threading member 60 has a threading groove 61 for the cable 40 to pass through. The threading member 60 further includes a pressing block 62 which is embedded in the slot of the threading groove 61.

[0073] When the cable 40 connected to the diode 22 passes through the threading groove 61, the pressing block 62 can be embedded in the slot of the threading groove 61 to form a complete wire hole. The detachable design of the threading member 60 and the pressing block 62 can facilitate the removal of the junction box from the photovoltaic module.

[0074] As shown in Figure 1 , Figure 3 , Figure 7As shown, the photovoltaic junction box further comprises a cable clamping groove 41 arranged on the outer wall of the second wall plate 120. The cross section of the cable clamping groove 41 is generally U-shaped, which is arranged on the outer wall of the second wall plate 120 and extends along the length direction of the second wall plate 120.

[0075] In practical application, the excess cable 40 after being bent or wound is placed in the cable clamping groove 41, which can prevent the cable 40 from falling off. In the process of photovoltaic module production or the process of photovoltaic module splicing, the connector on the cable 40 will be overlapped on the back plate glass after the cable 40 falls off. Since the connector is a hard device, scratches will be generated when it moves on the back plate glass, and then the back plate glass will be broken.

[0076] Those skilled in the art should understand that the above embodiments are only for clearly illustrating the present application, and are not intended to limit the scope of the present application. Based on the above disclosure, other changes or modifications can be made by those skilled in the art, and these changes or modifications are still within the scope of the present application.

Claims

1. A photovoltaic junction box, characterized in that, Includes a box body and a box lid, wherein the box body includes a first part and a second part that are detachably connected; The first part has a first wall panel, and the second part has a second wall panel opposite to the first wall panel; slots are formed on the end faces of the first wall panel and the second wall panel facing the lid; The box cover includes a cover plate and two insert plates disposed on the cover plate. The cover plate has a through hole. One of the two insert plates passes through the through hole and is inserted into the slot of the first wall plate, and the other is inserted into the slot of the second wall plate. The first wall panel has a through hole that penetrates the slot and connects the inner wall and the outer wall of the first wall panel.

2. The photovoltaic junction box according to claim 1, characterized in that, The photovoltaic junction box also includes a wire threading component, and grooves are respectively formed on two opposite sides of the wire threading component; The first part has a first side wall panel and a second side wall panel disposed at both ends of the first wall panel; the second part has a third side wall panel and a fourth side wall panel disposed at both ends of the second wall panel; The second side wall panel and the fourth side wall panel are connected by a snap-fit ​​structure; At least a portion of the first sidewall panel and at least a portion of the third sidewall panel are respectively disposed in the two grooves.

3. The photovoltaic junction box according to claim 2, characterized in that, A portion of the snap-fit ​​structure is located on the outer wall of the second side panel, and another portion is located on the outer wall of the fourth side panel.

4. The photovoltaic junction box according to claim 1, characterized in that, The photovoltaic junction box also includes a diode module, which is detachably housed within the box.

5. The photovoltaic junction box according to claim 4, characterized in that, The first part has a first bottom wall plate disposed at the bottom end of the first wall plate, and the second part has a second bottom wall plate disposed at the bottom end of the second wall plate. Stepped grooves are respectively formed on the opposite end faces of the first bottom wall plate and the second bottom wall plate. The diode module includes a substrate, and the two sides of the substrate are respectively engaged in the two stepped grooves.

6. The photovoltaic junction box according to claim 5, characterized in that, The diode module also includes a diode, a plurality of fixing posts and at least one support portion disposed on the substrate; The diode is mounted on the fixed post and located above the support.

7. The photovoltaic junction box according to claim 6, characterized in that, The diode module also includes a plurality of latches disposed on the substrate, the latches being engaged on the surface of the diode facing away from the substrate; At least two of the plurality of hooks are located on opposite sides of the diode.

8. The photovoltaic junction box according to claim 6, characterized in that, The distance between the diode and the cover plate is greater than or equal to the distance between the through hole and the cover plate.

9. The photovoltaic junction box according to claim 2, characterized in that, The cable threading component has a cable threading groove for the cable to pass through, and the cable threading component also includes a pressure block, which is embedded in the groove of the cable threading groove.

10. The photovoltaic junction box according to any one of claims 1-9, characterized in that, The photovoltaic junction box also includes a wire-holding groove, which is located on the outer wall of the second wall panel.

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