Photovoltaic junction box for offshore photovoltaic modules

Abstract

The present application relates to the technical field of photovoltaic junction box, especially to a photovoltaic junction box for offshore photovoltaic module, which comprises a junction casing, a cover plate and a circuit board, the junction casing is internally provided with a crimping assembly for quick disassembly and assembly; the crimping assembly comprises an inner support casing, two conductive sheets, two extrusion pieces and two unlocking blocks, the inner support casing is in abutment with the circuit board, the two conductive sheets are fixedly connected with the circuit board, and the inner support casing is provided with four sliding grooves. By pressing the unlocking block, the hard connection between the lead-out wire and the conductive sheet can be released by one key, without cleaning the silicone at the welding point and melting the solder, the junction casing can be directly scraped off, and during the disassembly process, the problem of lead-out wire breakage or back plate damage due to incomplete melting of solder can be avoided, the fine operation steps are reduced, the replacement operation efficiency is improved, the replacement operation time is shortened, and the safety risk is reduced.

Description

Technical Field

[0001] This invention relates to the field of photovoltaic junction box technology, and more particularly to a photovoltaic junction box for offshore photovoltaic modules. Background Technology

[0002] As a key electrical component connecting solar cell arrays to external wiring, the reliability of photovoltaic junction boxes directly affects the operating efficiency and system safety of photovoltaic power plants. Traditional junction boxes use soldering to connect the leads from the back of the photovoltaic panel to the internal circuit board, and use silicone to seal the solder joints and assist in heat dissipation. When the system experiences overload, short circuit, or bypass diode breakdown, the junction box needs to be replaced. The existing replacement process requires first removing the silicone sealant from the solder joints, melting the solder, and disconnecting the leads from the circuit board before the failed junction box can be removed. This disassembly and assembly process is time-consuming and complex. In offshore photovoltaic power plant applications, the bracket-type array structure is usually fixed in near-shore areas, and the replacement of junction boxes faces special challenges: the operators need to approach the target array by boat and move to the bottom of the photovoltaic junction box to be replaced via a lifting platform. However, due to the influence of waves and gusts of wind, the hull will sway, and the hull will sway, which will cause the lifting platform to sway, thus greatly increasing the difficulty of precise operation, making it difficult to position the welding gun, and easily causing the solder to be forcibly disassembled before it is completely melted, resulting in broken lead wires or damage to the back plate. This leads to prominent problems such as low efficiency and high safety risks in offshore junction box replacement operations. Summary of the Invention

[0003] This invention provides a photovoltaic junction box for offshore photovoltaic modules, which overcomes the disadvantages of increased difficulty in precise operation, low replacement efficiency, and high safety risks when replacing junction boxes of offshore photovoltaic modules due to the influence of waves and gusts.

[0004] The technical solution is as follows: A photovoltaic junction box for offshore photovoltaic modules, comprising:

[0005] The wiring housing, cover plate, and circuit board are provided. The cover plate and the circuit board slide within the wiring housing. The circuit board has two lead-out holes. The wiring housing is provided with a crimping assembly for quick assembly and disassembly.

[0006] The crimping assembly includes: an inner support shell, two conductive sheets, two pressing members, and two unlocking blocks. The inner support shell is slidably connected to the wiring housing and abuts against the circuit board. Both conductive sheets are fixedly connected to the circuit board. The inner support shell is provided with four sliding grooves. The pressing members slide within two adjacent sliding grooves on different sides of the inner support shell. The sliding grooves are provided with protrusions for limiting the pressing members. The two conductive sheets and the two pressing members are located on the facing and opposite sides of the two lead-out holes, respectively. The pressing members are used to press the lead-out wires and make them fit with the conductive sheets to achieve electrical connection. The wiring housing is provided with two mounting grooves. The unlocking blocks slide within adjacent mounting grooves and are used to press the pressing members.

[0007] Furthermore, the inner support shell is provided with two symmetrically distributed limiting grooves. The two adjacent sliding grooves and the mounting groove on the same side are all connected to the adjacent limiting grooves. The unlocking block slides in the adjacent limiting grooves to limit the inner support shell.

[0008] Furthermore, the inner support shell is fixedly connected to two symmetrically distributed traction plates, and the two traction plates are respectively fixedly connected to the side of the adjacent conductive sheet away from the lead-out hole. The extrusion member is cylindrical in shape.

[0009] Furthermore, the two traction plates are located on opposite sides of the two conductive sheets.

[0010] Furthermore, the traction plate is provided with a working square hole.

[0011] Furthermore, there is a distance between the extruder and the circuit board, and a guide is fixed to each of the two conductive sheets near the circuit board. The guide contacts the adjacent conductive sheet and is used to guide the deformation of the adjacent conductive sheet.

[0012] Furthermore, each of the two extrusion members has an extrusion groove on its opposite side and a protrusion on its opposite side. When the protrusion moves into an adjacent limiting groove, the protrusion limits the extrusion member.

[0013] Furthermore, each of the two extrusion members is fixedly connected to the circuit board with a shielding plate, and the two shielding plates are located on opposite sides of the two lead-out holes.

[0014] Furthermore, the wiring housing is provided with two plug holes, and the two lead-out holes are respectively connected to the adjacent plug holes. A rectangular frame groove is provided on the lower side of the wiring housing, and the two plug holes are located inside the rectangular frame groove.

[0015] Furthermore, the lower side of the plug hole is provided with symmetrically distributed guide slopes, which are used to guide the lead wire into the plug hole.

[0016] Compared with the prior art, the present invention has the following advantages: The present invention uses an extruder to extrude the lead wire and the conductive sheet to achieve electrical connection between the lead wire and the conductive sheet. When it is necessary to remove and replace, the rigid connection between the lead wire and the conductive sheet can be released with one click by pressing the unlocking block. There is no need to clean the silicone at the solder joint and melt the solder. The wire can be directly removed from the housing. At the same time, the problem of lead wire breakage or back plate damage due to incomplete solder melting will not occur during the disassembly process. It reduces the number of delicate operation steps, improves the efficiency of replacement operation, shortens the replacement operation time, and thus reduces safety risks.

[0017] By utilizing the extrusion of the extruder and the traction of the traction plate, the conductive sheet causes the lead wire to bend and wrap around the periphery of the extruder. This increases the contact area between the conductive sheet and the lead wire. Furthermore, as the lead wire bends and deforms with the conductive sheet, the friction between the conductive sheet and the extruder hinders the movement of the lead wire, keeping it taut. The lead wire assists in traction to fix the wiring housing to the back plate, thus maintaining the position of the wiring housing relative to the back plate during the silicone curing process. This reduces the probability of the wiring housing shifting due to sea breezes or other factors during silicone curing. It eliminates the need for on-site personnel to wait for silicone curing, shortens replacement time, and reduces safety risks.

[0018] The flat part of the guide is used to press and fix the lower part of the conductive sheet onto the circuit board. When the extruder causes the lead wire to bend and deform, the arc-shaped part of the guide guides the deformation at the position where the lead wire contacts the lead hole, causing the lead wire to bend and deform at a large angle, which makes it easier to pull and tighten the lead wire.

[0019] By using shielding plates and conductive plates to shield the lead wires, the probability of silicone sticking to the lead wires is reduced. This reduces the pulling force of the lead wires on the lead wires when they are removed from the wiring housing, thereby reducing the probability of the lead wires being pulled and breaking or even being damaged by the backplate. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0021] Figure 2 This is a three-dimensional structural diagram of the wiring housing and inner support housing of the present invention;

[0022] Figure 3 This is an exploded view of the wiring housing, inner support housing, and extrusion member of the present invention;

[0023] Figure 4 This is a three-dimensional structural diagram of the extrusion component and the unlocking block of the present invention;

[0024] Figure 5 This is a three-dimensional sectional view of the conductive sheet and extrusion before installation of the present invention;

[0025] Figure 6 This is a three-dimensional sectional view of the conductive sheet and extrusion component after installation according to the present invention;

[0026] Figure 7 This is a three-dimensional structural diagram of the wiring housing and rectangular frame groove of the present invention.

[0027] The markings in the diagram are as follows: 100-lead wire, 1-connection housing, 101-plug hole, 102-guide slope, 2-cover plate, 3-inner support shell, 4-circuit board, 401-lead hole, 5-conductive sheet, 6-extruded part, 601-sliding groove, 602-protrusion, 7-protruding ridge, 8-unlocking block, 801-installation groove, 802-limiting groove, 9-traction plate, 901-working square hole, 10-guide part, 11-extruded groove, 12-shielding piece, 13-rectangular frame groove. Detailed Implementation

[0028] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0029] Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the invention, and should not be construed as limiting the invention.

[0030] Example 1:

[0031] This embodiment discloses a photovoltaic junction box for offshore photovoltaic modules, which reduces the delicate operation steps in junction box replacement, improves replacement efficiency, and reduces safety risks.

[0032] See Figures 1-5 A photovoltaic junction box for offshore photovoltaic modules includes: a junction housing 1, a cover plate 2, and a circuit board 4. Both the cover plate 2 and the circuit board 4 slide within the junction housing 1. The cover plate 2 is used to seal the upper opening of the junction housing 1 (hereinafter referred to as...). Figure 1(Taking a perspective example for illustration), silicone sealant is placed inside the wiring housing 1; the circuit board 4 and the output cable are electrically connected by soldering, and the output cable passes through the wiring housing 1 and is sealed by potting compound; the circuit board 4 is provided with two lead holes 401, the length and width of which are greater than the length and width of the horizontal projection of the lead wire 100, respectively, so as to facilitate the insertion of the lead wire 100 into the lead hole 401; a surface-mount diode is mounted on the circuit board 4; a crimping assembly for quick assembly and disassembly is provided inside the wiring housing 1.

[0033] See Figures 3-5 The crimping assembly includes: an inner support shell 3, two conductive sheets 5, two pressing members 6, and two unlocking blocks 8. The inner support shell 3 is slidably connected to the wiring housing 1. The inner support shell 3 and the wiring housing 1 cooperate to clamp and fix the circuit board 4 at the bottom inside the wiring housing 1. The conductive sheets 5 are fixedly connected to the circuit board 4 near the lead-out hole 401 and electrically connected. Two symmetrically distributed sliding grooves 601 are provided on each of the left and right sides of the inner support shell 3. The pressing members 6 are limited and slid within the two sliding grooves 601 on the same side of the inner support shell 3. Two conductive sheets 5 and two extrusion pieces 6 are located on the opposite and back sides of the two lead-out holes 401, respectively, so that the two lead-out wires 100 are located between adjacent extrusion pieces 6 and adjacent conductive sheets 5. Two symmetrically distributed protrusions 7 are provided in the sliding groove 601. Both the inner support shell 3 and the protrusions 7 are made of polyethylene, allowing the protrusions 7 to deform after being extruded by the extrusion pieces 6. When the extrusion piece 6 passes over the protrusions 7, both the inner support shell 3 and the protrusions 7 adhere to and fix the extrusion piece 6; wiring shell. The body 1 is provided with two symmetrically distributed mounting grooves 801. The two unlocking blocks 8 are located on the opposite sides of the two extrusion parts 6. The unlocking blocks 8 slide in the adjacent mounting grooves 801. The unlocking blocks 8 are provided with two symmetrically distributed extrusion slopes. The distance between the two extrusion slopes on the same unlocking block 8 gradually decreases from the outside towards the inside of the wiring housing 1. The width of the extrusion slope of the unlocking block 8 in the left-right direction is greater than the distance between the midpoint of the end face of the extrusion part 6 and the adjacent protrusion 7 in the left-right direction when the conductive sheet 5 is electrically connected to the lead wire 100. This allows the extrusion part 6 to completely pass over the adjacent protrusion 7 after being extruded by the unlocking block 8. The unlocking block 8 is interference-fitted with the adjacent mounting groove 801. After installation on the back plate, the operator uses a glue gun to apply silicone to the part of the unlocking block 8 that protrudes from the wiring housing 1. The silicone completely wraps the part of the unlocking block 8 that protrudes from the wiring housing 1. This improves the stability of the connection between the unlocking block 8 and the wiring housing 1 and maintains the sealing of the wiring housing 1.

[0034] The above setup enables the lead wire 100 and conductive sheet 5 to be electrically connected by pressing the extruder 6. When it is necessary to remove or replace the lead wire 100, the rigid connection between the lead wire 100 and conductive sheet 5 can be released with one click by pressing the unlocking block 8. There is no need to clean the silicone at the solder joint and melt the solder. The lead wire 1 can be directly removed from the wiring housing 1. At the same time, the lead wire 100 will not break or the back plate will not be damaged due to the solder not being completely melted during the disassembly process. This reduces the number of delicate operation steps, improves the efficiency of replacement operation, shortens the replacement operation time, and thus reduces safety risks.

[0035] The steps for replacing the photovoltaic junction box are as follows: The operator approaches the target array by boat, and then moves to the bottom of the junction box to be replaced via a lifting platform to carry out the replacement operation; The operator uses tools to press the two unlocking blocks 8 into the junction box housing 1 simultaneously (the silicone originally adhered to the unlocking blocks 8 is squeezed and cracks appear and the adhesive surface fails, so the operator peels off the silicone). The operator uses the squeezing slope of the two unlocking blocks 8 to squeeze the two squeezing pieces 6 in a direction away from each other, so that the squeezing pieces 6 pass over the adjacent protrusions 7 and lose the squeezing of the lead wire 100 and the adjacent conductive piece 5. In this way, the rigid connection between the lead wire 100 and the adjacent conductive piece 5 is released. Then the operator uses tools to scrape the junction box housing 1 off the photovoltaic panel back plate. During the scraping process, the lead wire 100 gradually moves out of the lead hole 401 and loses contact with the adjacent conductive piece 5.

[0036] After removing the wiring housing 1, the operator cleans the silicone residue on the back plate and straightens the lead wires 100 using tools. Then, silicone is applied along the outer periphery of the lower side of the new wiring housing 1 using a glue gun. The cover plate 2 is removed, and the two lead wires 100 are aligned with the two lead holes 401 respectively. The new wiring housing 1 is then adhered to the back plate, at which point the lead wires 100 are inserted into the lead holes 401. The operator uses tools to simultaneously clamp the two extrusion pieces 6, causing the two extrusion pieces 6 to slide along the two adjacent sliding grooves 601 respectively. The distance between the two extrusion pieces 6 continues to decrease, and the distance between the extrusion pieces 6 and the adjacent lead wires 100 gradually decreases until they finally come into contact. As the extrusion pieces 6 move, they squeeze the adjacent lead wires 100 to the position where they contact the adjacent conductive sheet 5. At this point, the lead wires 100 and the adjacent conductive sheet 5 are electrically connected, and the operator stops clamping the extrusion pieces 6.

[0037] During the movement of the extruder 6, the extruder 6 slides along two adjacent sliding grooves 601 and the distance between it and the adjacent protrusion 7 decreases. Eventually, the two come into contact. After the extruder 6 deforms by pressing the adjacent protrusion 7, it passes over the adjacent protrusion 7. The protrusion 7 limits the extruder 6. At this time, the lead wire 100 comes into contact with the conductive sheet 5 and achieves electrical connection.

[0038] After the lead wire 100 is electrically connected to the conductive sheet 5, the operator pours silicone into the junction box 1 so that the silicone comes into contact with the conductive sheet 5 and seals the upper opening of the junction box 1. Then the operator uses a tool to scrape the silicone inside the junction box 1 flat and places the cover plate 2 on the upper opening of the junction box 1, thus completing the replacement of the photovoltaic junction box.

[0039] Example 2:

[0040] This embodiment discloses a photovoltaic junction box for offshore photovoltaic modules, which is further optimized based on Embodiment 1.

[0041] See Figure 2 and Figure 3 The inner support shell 3 is provided with two symmetrically distributed limiting grooves 802. The two adjacent sliding grooves 601 and mounting grooves 801 on the same side of the circuit board 4 are connected to the adjacent limiting grooves 802. Initially, one side of the unlocking block 8 is located in the adjacent limiting groove 802, and the side of the unlocking block 8 located in the adjacent limiting groove 802 is on the same plane as the side of the two extrusion parts 6, which does not affect the movement of the two extrusion parts 6.

[0042] The above settings can achieve the following: by using the unlocking block 8 to limit the inner support shell 3, the inner support shell 3 is fixed inside the wiring shell 1. On the one hand, this maintains the function of free disassembly between the inner support shell 3 and the wiring shell 1, which is convenient for the maintenance and replacement of the circuit board 4. On the other hand, it improves the stability of the inner support shell 3 inside the wiring shell 1.

[0043] Example 3:

[0044] This embodiment discloses a photovoltaic junction box for marine photovoltaic modules, which, based on embodiment 1, provides the function of using lead wire 100 to pull and fix the junction box housing 1.

[0045] See Figures 3-6 The inner support shell 3 is fixedly connected to two symmetrically distributed traction plates 9. The traction plates 9 are made of metal with excellent toughness, and copper alloy is selected here. The thickness of the root of the traction plate 9 is less than the thickness of the rest, so that the traction plate 9 can bend and deform at its root position. The two traction plates 9 are located on the opposite sides of the two conductive sheets 5, so they will not block the opposite sides of the two conductive sheets 5, which facilitates the contact between the silicone and the conductive sheets 5 and heat dissipation of the conductive sheets 5. A working square hole 901 is provided in the middle of the traction plate 9. The two traction plates 9 are fixedly connected to the side of the adjacent conductive sheet 5 away from the lead-out hole 401. The traction plate 9 and the conductive sheet 5 can be integrally formed. The thickness of the conductive sheet 5 is less than the thickness of the traction plate 9. The conductive sheet 5 as a whole can bend and deform. The extrusion part 6 is cylindrical in shape.

[0046] The above setup enables the following: when the extruder 6 extrudes the conductive sheet 5, the traction plate 9 pulls the conductive sheet 5, causing the lead wire 100 to bend and wrap around the periphery of the extruder 6. This increases the contact area between the conductive sheet 5 and the lead wire 100. Furthermore, as the lead wire 100 bends and deforms with the conductive sheet 5, the friction between the conductive sheet 5 and the extruder 6 hinders its movement, keeping the lead wire 100 taut. The lead wire 100 assists in pulling the wiring housing 1 to the back plate, thus maintaining the position of the wiring housing 1 relative to the back plate during the silicone curing process. This reduces the probability of the wiring housing 1 shifting due to sea breezes or other factors during silicone curing, eliminating the need for on-site personnel to wait for silicone curing, shortening replacement time, and reducing safety risks.

[0047] See Figure 5 and Figure 6 The length of the part of the conductive sheet 5 in a free state (i.e. the part of the conductive sheet 5 not fixed to the circuit board 4) is equal to half the circumference of the circle corresponding to the sum of the radius of the extrusion piece 6 and the thickness of the lead wire 100.

[0048] The above settings enable that when the conductive sheet 5 is squeezed by the extruder 6 and wrapped around its periphery, the upper part of the conductive sheet 5 can drive the lead wire 100 to wrap around the upper side of the extruder 6, and the connection between the traction plate 9 and the conductive sheet 5 is placed on the upper side of the extruder 6, so that the lead wire 100 and the conductive sheet 5 are in full contact.

[0049] The working principle of the above setup is as follows: The operator uses a tool to insert into the two working square holes 901 and contact the two extrusion pieces 6, causing the two extrusion pieces 6 to move closer to each other (the following explanation will take the lead wire 100 on the left as an example). The extrusion piece 6 first contacts the lead wire 100 and pushes it to the right. The lead wire 100 contacts the conductive sheet 5 and undergoes bending deformation. During the bending deformation, the conductive sheet 5 pulls the traction plate 9, causing the root of the traction plate 9 to bend. The elasticity of the traction plate 9 itself hinders the bending of the conductive sheet 5, so that the conductive sheet 5 exerts a leftward extrusion force on the lead wire 100. The upper part of the lead wire 100 overcomes the frictional force of the conductive sheet 5 and the extrusion piece 6 and slides downward along the periphery of the extrusion piece 6. The reaction force of the above frictional force on the lead wire 100 causes the lead wire 100 to be in a taut state, so that the lead wire 100 has a tendency to pull the wiring housing 1 closer to the back plate, which helps to keep the wiring housing 1 and the back plate relatively stationary before the silicone cures.

[0050] After the extrusion piece 6 passes the protrusion 7, the upper part of the extrusion piece 6 is wrapped around the periphery of the extrusion piece 6 by the conductive sheet 5. At the same time, the right side of the traction plate 9 is placed on the upper side of the extrusion piece 6, thus realizing the electrical connection between the lead wire 100 and the conductive sheet 5. Then, the operator uses a glue gun to inject silicone into the wiring housing 1, so that the silicone fills the space formed by the two conductive sheets 5, the inner support shell 3 and the circuit board 4. Then, silicone is applied to the upper side of the two traction plates 9 as a frame (due to the low fluidity of silicone, and the fact that the opening of the wiring housing 1 faces diagonally downwards during actual replacement, the silicone on the traction plate 9 will not enter between the traction plate 9 and the circuit board 4, that is, the silicone will not affect the movement of the extrusion piece 6). The upper part of the wiring housing 1 is filled with silicone to ensure the sealing of the wiring housing 1.

[0051] Example 4:

[0052] This embodiment discloses a photovoltaic junction box for offshore photovoltaic modules, which is further optimized based on embodiment 3.

[0053] See Figure 5 and Figure 6 There is a distance between the extruder 6 and the circuit board 4. The circuit board 4 is fixed with guides 10 near the two conductive sheets 5. The guides 10 are in contact with the conductive sheets 5. The guides 10 are composed of a straight part and an arc-shaped part.

[0054] The above settings enable the flat portion of the guide 10 to press and fix the lower part of the conductive sheet 5 onto the circuit board 4. When the extruder 6 causes the lead wire 100 to bend and deform, the arc-shaped portion of the guide 10 guides the lead wire 100 to deform at the contact point with the lead hole 401, preventing the lead wire 100 from bending at too small an angle, which would make it difficult to pull and tighten the lead wire 100.

[0055] Example 5:

[0056] This embodiment discloses a photovoltaic junction box for marine photovoltaic modules, which, based on embodiment 4, provides a function to reduce the probability of adhesion between the silicone inside the junction box 1 and the lead wire 100.

[0057] See Figure 5 and Figure 6 Each of the two extrusion pieces 6 is fixedly connected to a shielding plate 12 between itself and the circuit board 4. The shielding plate 12 is made of flexible polyethylene. The two shielding plates 12 are located on opposite sides of the two lead-out holes 401. The lengths of the shielding plate 12 and the conductive plate 5 in the front-back direction are both greater than the lengths of the lead-out holes 401 in the front-back direction. Each of the opposite sides of the two extrusion pieces 6 is provided with an extrusion groove 11. Each of the opposite sides of the two extrusion pieces 6 is provided with a protrusion 602. The protrusion 602 only serves to restrict the rotation of the extrusion piece 6 when it moves into the adjacent limiting groove 802. The protrusion 602 can be a solder joint.

[0058] The above settings achieve the following: the shielding plate 12 and conductive plate 5 are used to shield the lead wire 100, reducing the probability of silicone sticking to the lead wire 100, thereby reducing the pulling force of the wiring housing 1 on the lead wire 100 when it is removed from the wiring housing 1, and thus reducing the probability of the lead wire 100 being pulled and broken or even damaged by the back plate; the extrusion groove 11 guides the extrusion piece 6 to rotate at a small angle during movement, which facilitates tool clamping and guides the lead wire 100 upward by the rotation of the extrusion piece 6 and the friction between it and the lead wire 100, which helps to make the lead wire 100 reach a taut state; the protrusion 602 is used to limit the rotation of the extrusion piece 6.

[0059] When the operator uses a tool to clamp the two extrusion parts 6, the tool (e.g., needle-nose pliers) comes into contact with the extrusion groove 11. As the two extrusion parts 6 approach each other, the included angle of the tool gradually decreases. At the same time, the tool will squeeze the extrusion groove 11 and cause the extrusion parts 6 to rotate (the extrusion part 6 on the left rotates counterclockwise, and the extrusion part 6 on the right rotates clockwise; this article uses...). Figure 1 (The main view is from a rotating perspective). The extruder 6 drives the protrusion 602 on it to rotate. After the extruder 6 passes the protrusion 7, the center point of the protrusion 602 and the central axis of the extruder 6 are on the same horizontal plane. At the same time, the protrusion 602 moves into the adjacent limiting groove 802, thus restricting the rotation of the extruder 6.

[0060] After the lead wire 100 is electrically connected to the conductive sheet 5, the conductive sheet 5 and the extruder 6 respectively block the left and right sides of the lead wire 100, and the shielding sheet 12 and the conductive sheet 5 block the lead hole 401. At the same time, the silicone has poor fluidity, so the probability of the silicone sticking to the lead wire 100 can be reduced.

[0061] Example 6:

[0062] This embodiment discloses a photovoltaic junction box for marine photovoltaic modules, which, based on embodiment 5, provides a function to reduce the probability of adhesion between the silicone on the bottom side of the junction box 1 and the lead wire 100.

[0063] See Figure 5 and Figure 7 The lower side of the wiring housing 1 is provided with two plug holes 101, and the two lead holes 401 are respectively connected to the adjacent plug holes 101. The lower side of the wiring housing 1 is provided with a rectangular frame groove 13, and the two plug holes 101 are located inside the rectangular frame groove 13. Symmetrically distributed guide slopes 102 are provided on the lower side of the plug holes 101.

[0064] The above settings can reduce the probability of the silicone on the lower side of the wiring housing 1 sticking to the lead wire 100 by using the rectangular frame groove 13, thereby reducing the pulling force of the wiring housing 1 on the lead wire 100 when it is removed from the wiring housing 1, protecting the lead wire 100 and the back plate; and guide the lead wire 100 into the plug hole 101 by using the guide slope 102, improving the convenience of replacement operation.

[0065] After applying silicone to the outer periphery of the lower side of the wiring housing 1, the operator presses the wiring housing 1 against the back plate. At this time, the silicone on the lower side of the wiring housing 1 is squeezed and flows outwards. Part of the silicone flows out of the gap between the wiring housing 1 and the back plate, while another part flows towards the center of the gap. This part of the silicone, when flowing through the rectangular groove 13, enters the rectangular groove 13 and accumulates there, similar to setting up a "moat" around the two plug holes 101, reducing the probability of silicone entering the two plug holes 101 and sticking to the lead wire 100. Finally, it should be noted that the above embodiments are obviously just examples for clearly illustrating this application, and are not intended to limit the implementation. For those skilled in the art, other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all embodiments here. However, obvious variations or modifications derived therefrom are still within the protection scope of this application.

Claims

1. A photovoltaic junction box for a marine photovoltaic assembly, comprising: a junction housing (1), a cover plate (2) and a circuit board (4), the cover plate (2) and the circuit board (4) are both sliding in the junction housing (1), the circuit board (4) is provided with two lead-out holes (401), characterized in that a crimping assembly for quick disassembly is arranged in the junction housing (1); the crimping assembly comprises an inner support shell (3), two conductive sheets (5), two extrusion pieces (6) and two unlocking blocks (8), the inner support shell (3) is slidingly connected with the junction housing (1) and abuts against the circuit board (4), the two conductive sheets (5) are both fixedly connected with the circuit board (4), the inner support shell (3) is provided with four sliding grooves (601), the extrusion pieces (6) are slidingly limited in two adjacent sliding grooves (601) on different sides of the inner support shell (3), the sliding grooves (601) are provided with protrusions (7) for limiting the extrusion pieces (6), the two conductive sheets (5) and the two extrusion pieces (6) are respectively located on the opposite side and the back side of the two lead-out holes (401), the extrusion pieces (6) are used for extruding the lead-out wire (100) and making it adhere to the conductive sheets (5) to realize electrical connection, the junction housing (1) is provided with two mounting grooves (801), the unlocking blocks (8) are slidingly arranged in the adjacent mounting grooves (801) and used for extruding the extrusion pieces (6); the inner support shell (3) is provided with two limiting grooves (802) symmetrically distributed, the two adjacent sliding grooves (601) and the mounting grooves (801) on the same side are all communicated with the adjacent limiting grooves (802), the unlocking blocks (8) are slidingly arranged in the adjacent limiting grooves (802) and used for limiting the inner support shell (3); the inner support shell (3) is fixedly connected with two traction plates (9) symmetrically distributed, the two traction plates (9) are respectively fixedly connected with the sides of the adjacent conductive sheets (5) away from the lead-out holes (401), the extrusion pieces (6) are in the shape of a cylinder as a whole; the two traction plates (9) are located on the back side of the two conductive sheets (5).

2. A photovoltaic junction box for a photovoltaic assembly at sea according to claim 1, characterized in that the traction plate (9) is provided with a work side hole (901).

3. A photovoltaic junction box for a marine photovoltaic assembly according to claim 1, characterized in that, there is a distance between the extrusion pieces (6) and the circuit board (4), the circuit board (4) is fixedly connected with a guide piece (10) near the position of the two conductive sheets (5), the guide piece (10) is in contact with the adjacent conductive sheet (5), and the guide piece (10) is used for guiding the deformation of the adjacent conductive sheet (5).

4. A photovoltaic junction box for a photovoltaic assembly at sea according to claim 3, characterized in that the back side of each of the two extrusion pieces (6) is provided with an extrusion groove (11), the front side of each of the two extrusion pieces (6) is provided with a protrusion (602), when the protrusion (602) moves into the adjacent limiting groove (802), the protrusion (602) limits the extrusion piece (6).

5. A photovoltaic junction box for a photovoltaic assembly at sea according to claim 4, characterized in that each of the two extrusion pieces (6) is fixedly connected with a shielding sheet (12) between the extrusion piece (6) and the circuit board (4), and the two shielding sheets (12) are located on the back side of the two lead-out holes (401).

6. A photovoltaic junction box for a marine photovoltaic assembly according to claim 1, characterized in that, The wiring shell (1) is provided with two plug holes (101), two said lead-out holes (401) are communicated with adjacent said plug holes (101) respectively, the lower side of the wiring shell (1) is provided with a rectangular frame slot (13), and two said plug holes (101) are located on the inner side of the rectangular frame slot (13).

7. A photovoltaic junction box for a photovoltaic assembly at sea according to claim 6, characterized in that The lower side of the plug hole (101) is provided with symmetrically distributed guide inclined surfaces (102), and the guide inclined surfaces (102) are used for guiding the lead-out wire (100) into the plug hole (101).

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