Wiring terminal box

Abstract

The utility model relates to the technical field of battery wiring, and discloses a wiring terminal box, which comprises a box body, a conductor and a locking bolt, the conductor is arranged in the box body, the upper end of the box body is provided with an operation hole, the side surface of the box body is provided with a first connecting hole, the lower end of the box body is provided with a second connecting hole, the operation hole is provided with an upper cover, and the opening directions of the operation hole and the second connecting hole are the same. The opening direction of the first connecting hole is perpendicular to the opening direction of the second connecting hole, a first conductive hole and a second conductive hole which extend in the axial direction of the conductor are formed in the two ends of the conductor respectively, the locking bolt is in threaded connection with the first conductive hole, and the second conductive hole and the second connecting hole are communicated and coaxially arranged. The terminal stud of the battery electrode can directly extend into the second conductive hole through the second connecting hole to realize connection between the terminal stud of the battery electrode and the second conductive hole, so that direct connection between the battery electrode and a conductor in the terminal box is realized, the cost is reduced, the electric energy conduction efficiency is improved, and the use risk caused by loosening of a connecting point is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of battery wiring, in particular to a wiring terminal box. Background Art

[0002] Currently, liquid-cooled tanks, which utilize circulating coolant for cooling, require terminal boxes that meet high requirements for waterproofing, flame retardancy, and good electrical conductivity when connecting external cables to internal batteries or electronic components. This is because these boxes require connections to high-voltage batteries or electronic components, are primarily used outdoors, and coolant circulates both inside the tank and through the external pump. To prevent coolant leaks in extreme conditions, or the effects of extreme weather such as rain or snow, which could damage the electrodes and cause unnecessary disasters, the waterproof terminal boxes require excellent waterproofing, flame retardancy, and electrical conductivity during use.

[0003] Most commonly used waterproof terminal boxes on the market use screw-mounted terminal blocks, copper conductors, and straight-line external connectors. This structure is unsuitable for applications such as energy storage, where liquid cooling systems require high current and voltage connections. This is because the screw-mounted terminal blocks are prone to loosening, the copper conductors are too thin, creating safety hazards in high-voltage and high-current environments, and the straight-line connection structure creates a poor seal when assembled with the box, limiting assembly space.

[0004] Currently, the industry has developed some waterproof terminal boxes specifically for liquid-cooled enclosures, most commonly used on energy storage packs. These utilize a right-angle connection method, with one set of battery cables inside the box connecting horizontally to the terminal box, and another set of cables outside connecting vertically. The materials used and the sealing structure also utilize high-quality flame-retardant insulation and sealing materials. However, connecting the battery terminals requires connecting the battery electrodes inside the box to copper busbars, which are then connected to the conductors inside the terminal box. A design flaw lies in the flat structure of the conductors inside the terminal box, which requires the copper busbars to serve as a medium for connecting to the cables. Existing terminal boxes feature conductors inside and copper busbars outside. The copper busbars are connected to the internal conductors by welding or other methods, and then to the battery electrodes using bolts. This prior art connection process involves connecting the battery electrodes to the copper busbars via their bolts, which are then connected to the conductors inside the terminal box. Gaps exist between the conductors and the copper busbar surface, and between the copper busbar and the electrode surface. These gaps, accumulated over years of high-power current use and continuous oxidation, can lead to energy efficiency loss, most seriously posing a risk of arcing. During most copper busbar processing processes, small, or even unspecified, burrs remain on the surface. These burrs can pose an arcing risk under long-term, high-power current conditions. The copper busbars used as an intermediate connection between the battery electrodes and the internal conductors of the terminal box also experience energy loss during power transmission, impacting efficiency. Furthermore, copper busbar production requires excellent electrical conductivity, typically using red copper as the raw material, followed by a nickel plating process for surface treatment, and finally requiring plastic coating. This leads to high costs. Utility Model Content

[0005] The purpose of the utility model is to provide a terminal box with better conductive performance and higher stability.

[0006] In order to achieve the above-mentioned purpose, the utility model provides a terminal box, including a box body, a conductor and a locking bolt, the conductor is arranged in the box body, the upper end of the box body is provided with an operation hole, the side is provided with a first connection hole, and the lower end is provided with a second connection hole, the operation hole, the first connection hole and the second connection hole are all communicated with the interior of the box body, and an upper cover is provided at the operation hole, the opening direction of the operation hole and the second connection hole is the same, the opening direction of the first connection hole is perpendicular to the opening direction of the second connection hole, the two ends of the conductor are respectively provided with a first conductive hole and a second conductive hole extending along the axial direction thereof, the locking bolt is threadedly connected to the first conductive hole, and the second conductive hole is communicated with the second connection hole and is coaxially arranged.

[0007] As a preferred solution, the axis of the first conductive hole and the axis of the second conductive hole are located on the same straight line, and a partition is provided between the first conductive hole and the second conductive hole so that the first conductive hole and the second conductive hole are not connected.

[0008] As a preferred solution, the cross section of the conductor is polygonal.

[0009] As a preferred solution, a positioning groove is provided on the outer side surface of the conductor, and the box body is provided with a positioning block for embedding in the positioning groove.

[0010] As a preferred solution, an upper sealing ring is provided between the upper cover and the box body.

[0011] As a preferred solution, a lower sealing groove is provided on the end surface of the lower end of the box body, the second connecting hole is located on the inner side of the lower sealing groove, and a lower sealing ring is installed in the lower sealing groove.

[0012] As a preferred solution, it also includes a cable fastening mechanism, which includes a fastening nut and a port sealing ring. The side of the box body is provided with a connecting tube that communicates with the first connecting hole. The inner diameter of the connecting tube is larger than the aperture of the first connecting hole. The outer side surface of the connecting tube is provided with an external thread. The fastening nut is a cylindrical structure with openings at both ends. The inner wall of the fastening nut is provided with an internal thread that matches the external thread of the connecting tube. The fastening nut is threadedly connected to the connecting tube. The fastening nut is provided with a circle of inwardly extending retaining edge. The port sealing ring is located in the fastening nut, and the two ends of the port sealing ring are respectively against the end of the connecting tube away from the box body and the retaining edge.

[0013] As a preferred solution, the port sealing ring includes a first sealing part, a second sealing part and a third sealing part connected in sequence, the first sealing part is arranged close to the first connecting hole, the third sealing part is far away from the first connecting hole, the outer diameter of the first sealing part is larger than the inner diameter of the connecting pipe, and the outer diameter of the third sealing part is larger than the inner diameter of the fastening nut.

[0014] As a preferred solution, the cable fastening mechanism also includes a clamping ring, which is provided with a notch, and the outer diameter of the clamping ring gradually decreases from one side to the other side, so that the outer side surface of the clamping ring is a slope, the clamping ring is located in the fastening nut, and the clamping ring is located between the port sealing ring and the blocking edge, the side of the clamping ring with a smaller outer diameter is close to the blocking edge, and the inner wall of the fastening nut with an internal thread is a slope with the same slope as the outer side surface of the clamping ring.

[0015] As a preferred solution, the cable fastening mechanism includes a flat washer, and the flat washer is located between the port sealing ring and the clamping ring.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] The present invention provides an operating hole and a first connection hole, allowing the cable to extend into the box body through the first connection hole, and then the locking bolt is threadedly connected to the first conductive hole of the conductor to compress the cable terminal and the conductor, thereby achieving electrical connection between the conductor and the cable. The present invention also provides a second connection hole in the box body, which is in communication with the second conductive hole of the conductor and is coaxially arranged, so that the battery electrode's terminal bolt can be directly extended into the second conductive hole through the second connection hole to achieve connection between the battery electrode's terminal bolt and the second conductive hole, thereby achieving direct connection between the battery electrode and the conductor in the terminal box, eliminating the copper busbar, avoiding the dangers of arc discharge and other hazards caused by the copper busbar connection, and reducing costs. In addition, there is no energy loss caused by the copper busbar during the power conduction process, thereby improving the power conduction efficiency. The present invention directly connects the electrode to the conductor in the terminal box, which can make the connection more stable, reduce the risk of loosening the connection point during vibration or severe external force, and improve stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the wiring terminal box of the embodiment of the utility model without connecting the fastening nut.

[0019] Figure 2 It is an exploded view of the terminal box according to an embodiment of the present invention.

[0020] Figure 3 It is a schematic structural diagram of a conductor cut in an embodiment of the present utility model.

[0021] In the figure, 1-box body; 101-upper sealing groove; 2-conductor; 201-first conductive hole; 202-second conductive hole; 203-partition; 204-positioning groove; 3-locking bolt; 4-upper cover; 401-first mounting hole; 5-upper sealing ring; 6-lower sealing ring; 7-mounting bolt; 8-first mounting nut; 9-second mounting nut; 10-fastening nut; 1001-first fastening part; 1002-second fastening part; 11-port sealing ring; 12-connecting pipe; 13-circlip; 14-flat washer. DETAILED DESCRIPTION

[0022] The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0023] In the description of the present invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0025] In addition, in the description of the present invention, unless otherwise specified, “a plurality of” means two or more.

[0026] Example 1

[0027] like Figures 1 to 3As shown, a terminal box according to a preferred embodiment of the present invention includes a box body 1, a conductor 2 and a locking bolt 3. The conductor 2 is arranged in the box body 1. The upper end of the box body 1 is provided with an operation hole, the side is provided with a first connection hole, and the lower end is provided with a second connection hole. The operation hole, the first connection hole and the second connection hole are all communicated with the interior of the box body 1. An upper cover 4 is provided at the operation hole. The opening directions of the operation hole and the second connection hole are the same, and the opening direction of the first connection hole is perpendicular to the opening direction of the second connection hole. The two ends of the conductor 2 are respectively provided with a first conductive hole 201 and a second conductive hole 202 extending along the axial direction thereof. The locking bolt 3 is threadedly connected to the first conductive hole 201, and the second conductive hole 202 is communicated with the second connection hole and is coaxially arranged. In this embodiment, an operation hole and a first connection hole are provided so that the cable can be inserted into the box body 1 through the first connection hole, and then the locking bolt 3 is threadedly connected to the first conductive hole 201 of the conductor 2 to compress the cable terminal and the conductor 2, thereby realizing the electrical connection between the conductor 2 and the cable. In addition, in this embodiment, a second connection hole is provided in the box body 1, and the second connection hole is communicated with the second conductive hole 202 of the conductor 2 and is coaxially arranged, so that the battery electrode's terminal bolt can be directly inserted into the second conductive hole 202 through the second connection hole to realize the connection between the battery electrode and the second conductive hole 202, thereby realizing the direct connection between the battery electrode and the conductor 2 in the terminal box, eliminating the copper busbar, avoiding the dangers of arc discharge and the like caused by the copper busbar connection, and reducing costs. In addition, there is no energy loss of the copper busbar during the power conduction process, thereby improving the power conduction efficiency. The utility model directly connects the electrode to the conductor 2 in the terminal box, which can make the connection more stable, reduce the use risk caused by the loosening of the connection point during vibration or severe external force, and improve stability.

[0028] In this embodiment, both the first conductive hole 201 and the second conductive hole 202 are provided with internal threads, so that the first conductive hole 201 is threadedly connected to the locking bolt 3 , and the second conductive hole 202 is threadedly connected to the battery electrode connection bolt.

[0029] Example 2

[0030] The difference between this embodiment and the first embodiment is that, based on the first embodiment, this embodiment further illustrates the conductor 2 .

[0031] In this embodiment, the axis of the first conductive hole 201 and the axis of the second conductive hole 202 are colinear. A partition 203 is provided between the first conductive hole 201 and the second conductive hole 202 to prevent communication between the first conductive hole 201 and the second conductive hole 202. The partition 203 provides a waterproof seal, preventing liquid from seeping through the second conductive hole 202 after connecting a cable, or preventing liquid from seeping through the first conductive hole 201 after connecting an electrode, during use.

[0032] In addition, the conductor 2 of this embodiment is treated by copper plating on aluminum alloy and then nickel plating to enhance the conductivity, oxidation resistance and corrosion resistance of the conductor 2. The conductor 2 can also be treated by nickel plating on copper to achieve the same effect.

[0033] In addition, the cross-section of the conductor 2 of this embodiment is polygonal, which can effectively prevent the conductor 2 and the box body 1 from sliding due to torsion during the assembly process. Furthermore, a positioning groove 204 is provided on the outer side of the conductor 2, and the box body 1 is provided with a positioning block for embedding in the positioning groove 204, which can effectively prevent the conductor 2 and the box body 1 from sliding in the direction of the shell inward or outward due to external force. The positioning groove 204 of this embodiment is an annular groove. In addition, during the manufacturing process of the terminal box of this embodiment, the box body 1 is injection molded, and the conductor 2 is embedded in the box body 1 during the injection molding process, so the positioning block is embedded in the positioning groove 204 of the conductor 2 during the injection molding process, so that the conductor 2 and the box body 1 become one.

[0034] Furthermore, in this embodiment, an upper sealing ring 5 is provided between the upper cover 4 and the box body 1 to provide a waterproof seal. Furthermore, a lower sealing groove is provided on the lower end surface of the box body 1. The second connection hole is located inside the lower sealing groove, and a lower sealing ring 6 is installed in the lower sealing groove. When the terminal box is connected to the battery terminal, the lower end of the box body 1 is in close contact with the electrode plate of the battery terminal. The lower sealing ring 6 is located between the lower end of the box body 1 and the electrode plate of the battery terminal, providing a seal. Both the upper sealing ring 5 and the lower sealing ring 6 are annular structures.

[0035] In this embodiment, the upper cover 4 is connected to the box body 1 via mounting bolts 7. A first nut is provided at the upper end of the box body 1, and a first mounting hole 401 is defined in the upper cover 4. The mounting bolt 7 passes through the first mounting hole 401 and connects with the first mounting nut 8. An upper sealing groove 101 is defined at the upper end of the box body 1. The operating hole is located inside the upper sealing groove 101, and the upper sealing ring 5 is embedded in the upper sealing groove 101. A second mounting nut 9 is provided at the lower end of the box body 1 for bolting to the battery case panel.

[0036] Specifically, during the injection molding process of the box body 1, four first mounting nuts 8 are embedded in the upper end and four second mounting nuts 9 are embedded in the lower end, so that the first mounting nuts 8, the second mounting nuts 9 and the shell of the box body 1 are injection molded into one piece and are not easy to loosen.

[0037] In this embodiment, the box body 1 is made of PA66+GF, with a GF content of 30% to 40%, a fire rating of UL90-V0, and a plastic material. The positive terminal is orange and the negative terminal is black.

[0038] The other structures of this embodiment are the same as those of the first embodiment and will not be described again here.

[0039] Example 3

[0040] The difference between this embodiment and the second embodiment is that, based on the second embodiment, this embodiment further illustrates the structure of the side surface of the terminal box.

[0041] The terminal box of this embodiment also includes a cable fastening mechanism, which includes a fastening nut 10 and a port sealing ring 11. A connecting tube 12 communicating with the first connecting hole is provided on the side of the box body 1. The inner diameter of the connecting tube 12 is larger than the aperture of the first connecting hole. The outer side surface of the connecting tube 12 is provided with an external thread. The fastening nut 10 is a cylindrical structure with openings at both ends. The inner wall of the fastening nut 10 is provided with an internal thread matching the external thread of the connecting tube 12. The fastening nut 10 is threadedly connected to the connecting tube 12. The fastening nut 10 is provided with a circle of inwardly extending retaining edge. The port sealing ring 11 is located in the fastening nut 10, and the two ends of the port sealing ring 11 respectively abut against the end of the connecting tube 12 away from the box body 1 and the retaining edge.

[0042] The second connection hole at the bottom of the terminal box body 1 connects to the battery electrode, while the first connection hole on the side connects to the external cable. The cable terminal extends into the box body 1 through the connecting tube 12, and the cable terminal extends above the conductor 2. Then, tighten the locking bolt 3 and the first conductive hole 201, pressing the cable terminal against the top surface of the conductor 2 to achieve an electrical connection between the cable and the conductor 2. Then, the upper cover 4 is connected to the box body 1 using the mounting bolts 7. Finally, tighten the fastening nut 10 to deform the port sealing ring 11, which acts as a waterproof seal. The retaining edge of the fastening nut 10 is used to prevent the port sealing ring 11 from slipping out. In this embodiment, the fastening nut 10 includes a first fastening portion 1001 and a second fastening portion 1002 connected to each other. The diameter of the first fastening portion 1001 is smaller than the diameter of the second fastening portion 1002, so that a retaining edge is formed at the turning point between the first fastening portion 1001 and the second fastening portion 1002, and the inner wall of the second fastening portion 1002 is provided with an internal thread for threaded connection with the connecting pipe 12.

[0043] Furthermore, the port sealing ring 11 of this embodiment includes a first sealing portion, a second sealing portion and a third sealing portion connected in sequence, the first sealing portion is arranged close to the first connecting hole, the third sealing portion is away from the first connecting hole, the outer diameter of the first sealing portion is larger than the inner diameter of the connecting pipe 12, and the outer diameter of the third sealing portion is larger than the inner diameter of the fastening nut 10, thereby improving the sealing performance. In addition, the second sealing portion is a retractable structure, which can further improve the sealing and waterproof performance. Optionally, the port sealing ring 11 is a silicone sealing ring or a fluororubber sealing ring. When the circulating coolant in the liquid cooling box adopts ethylene glycol, the port sealing ring 11 adopts silicone rubber. When the coolant in the liquid cooling box adopts a carbonized fluorine solution, the port sealing ring 11 adopts fluororubber.

[0044] In addition, the cable tightening mechanism of this embodiment also includes a snap ring 13. The snap ring 13 is provided with a notch, and the outer diameter of the snap ring 13 gradually decreases from one side to the other, making the outer surface of the snap ring 13 a bevel. The snap ring 13 is located in the fastening nut 10, and the snap ring 13 is located between the port seal 11 and the retaining edge. The side of the snap ring 13 with a smaller outer diameter is closer to the retaining edge. The inner wall of the fastening nut 10 with an internal thread is a bevel with the same slope as the outer surface of the snap ring 13. The snap ring 13 of this embodiment is shaped like a circular ring with a bevel on the side and has a notch. The notch allows the outer diameter of the snap ring 13 to shrink when it is subjected to external extrusion force. The inner wall of the fastening nut 10 is a bevel. When the fastening nut 10 is tightened on the connecting pipe 12, pressure is applied to the bevel of the snap ring 13, causing the snap ring 13 to shrink and reduce in diameter, thereby tightening the port seal 11 and clamping the cable.

[0045] In addition, the cable securing mechanism of this embodiment includes a flat washer 14, which is located between the port seal 11 and the snap ring 13. The snap ring 13 is in direct contact with the port seal 11. When the snap ring 13 contracts under pressure, the frictional force can squeeze and deform the port seal 11, causing water leakage. Therefore, the flat washer 14 acts as a barrier and buffer between the port seal 11 and the snap ring 13, effectively protecting the port seal 11.

[0046] Snap ring 13 and flat washer 14 are made of PA66+GF (GF content of 30% to 40%), with a fire rating of UL90-V0. Fastening nut 10 is made of metal, such as stainless steel, copper, or aluminum alloy. Depending on the material, various surface treatments can be used for corrosion and rust prevention, such as electrophoresis, powder coating, painting, electroplating, and anodizing. Furthermore, the exterior of fastening nut 10 features polygonal, horizontal, or knurled patterns, allowing for tightening and loosening using tools or friction.

[0047] The other structures of this embodiment are the same as those of the second embodiment and will not be described again here.

[0048] The working process of the present invention is as follows: install the clamping ring 13, flat washer 14, and port sealing ring 11 into the fastening nut 10 in sequence, first lightly screw the fastening nut 10 onto the connecting tube 12, then insert the cable terminal through the fastening nut 10 and the connecting tube 12 into the box body 1 until the cable terminal extends directly above the conductor 2, then tighten the locking bolt 3 into the first conductive hole 201 of the conductor 2, press the cable terminal onto the conductor 2, and connect the cable to the terminal box, then tighten the fastening nut 10, tighten the clamping ring 13, clamp the cable and tighten the port sealing ring 11. Then cover the top of the box body 1 with the upper cover 4, tighten the mounting bolt 7 on the first mounting nut 8, and the upper sealing ring 5 is pressed between the upper cover 4 and the box body 1. Align the lower end of the box body 1 with the battery electrode panel, pass the battery electrode connection bolt through the second connection hole and tighten it into the second conductive hole 202 of the conductor 2, and finally tighten the bolt on the panel into the second mounting nut 9 to achieve electrical connection between the battery electrode and the terminal box.

[0049] In summary, the embodiment of the present invention provides a terminal box, which, by setting an operating hole and a first connection hole, allows the cable to extend into the box body 1 through the first connection hole, and then the locking bolt 3 is threadedly connected to the first conductive hole 201 of the conductor 2 to compress the cable terminal and the conductor 2, thereby realizing the electrical connection between the conductor 2 and the cable, and the present embodiment sets a second connection hole in the box body 1, the second connection hole is connected to the second conductive hole 202 of the conductor 2 and is coaxially arranged, so that the battery electrode's terminal bolt can be directly extended into the second conductive hole 202 through the second connection hole to realize the connection of the battery electrode's terminal bolt with the second conductive hole 202, thereby realizing the direct connection between the battery electrode and the conductor 2 in the terminal box, eliminating the copper busbar, avoiding the dangers of arc discharge and other hazards caused by the copper busbar connection, and reducing costs. In addition, there is no energy loss of the copper busbar during the power conduction process, thereby improving the power conduction efficiency. The utility model directly connects the electrode to the conductor 2 in the terminal box, which can make the connection more stable, reduce the use risk caused by the loosening of the connection point during vibration or severe external force, and has better stability.

[0050] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and replacements can be made without departing from the technical principles of the present invention. These improvements and replacements should also be regarded as the scope of protection of the present invention.

Claims

1. A terminal box, characterized in that: The invention comprises a box body (1), a conductor (2) and a locking bolt (3), wherein the conductor (2) is arranged in the box body (1), an operation hole is provided at the upper end of the box body (1), a first connection hole is provided at the side surface, and a second connection hole is provided at the lower end, wherein the operation hole, the first connection hole and the second connection hole are all communicated with the interior of the box body (1), an upper cover (4) is provided at the operation hole, the operation hole and the second connection hole have the same opening direction, the opening direction of the first connection hole is perpendicular to the opening direction of the second connection hole, a first conductive hole (201) and a second conductive hole (202) extending along the axial direction of the conductor (2) are respectively provided at both ends, the locking bolt (3) is threadedly connected to the first conductive hole (201), and the second conductive hole (202) is communicated with the second connection hole and is coaxially arranged.

2. The terminal box according to claim 1, wherein: The axis of the first conductive hole (201) and the axis of the second conductive hole (202) are located on the same straight line, and a partition (203) is provided between the first conductive hole (201) and the second conductive hole (202), so that the first conductive hole (201) and the second conductive hole (202) are not connected.

3. The terminal box according to claim 1, wherein: The cross section of the conductor (2) is polygonal.

4. The terminal box according to claim 1, wherein: The outer side surface of the conductor (2) is provided with a positioning groove (204), and the box body (1) is provided with a positioning block for embedding in the positioning groove (204).

5. The terminal box according to claim 1, wherein: An upper sealing ring (5) is provided between the upper cover (4) and the box body (1).

6. The terminal box according to claim 1, wherein: A lower sealing groove is provided on the end surface of the lower end of the box body (1), the second connection hole is located inside the lower sealing groove, and a lower sealing ring (6) is installed in the lower sealing groove.

7. The terminal box according to claim 1, wherein: The invention also includes a cable fastening mechanism, which includes a fastening nut (10) and a port sealing ring (11). A connecting tube (12) communicating with the first connecting hole is provided on the side of the box body (1), the inner diameter of the connecting tube (12) is larger than the aperture of the first connecting hole, and the outer side surface of the connecting tube (12) is provided with an external thread. The fastening nut (10) is a cylindrical structure with two ends open. The inner wall of the fastening nut (10) is provided with an internal thread matching the external thread of the connecting tube (12). The fastening nut (10) is threadedly connected to the connecting tube (12), and the fastening nut (10) is provided with a circle of inwardly extending retaining edge. The port sealing ring (11) is located in the fastening nut (10), and the two ends of the port sealing ring (11) respectively abut against the end of the connecting tube (12) away from the box body (1) and the retaining edge.

8. The terminal box according to claim 7, characterized in that: The port sealing ring (11) includes a first sealing portion, a second sealing portion, and a third sealing portion connected in sequence, wherein the first sealing portion is arranged close to the first connecting hole, and the third sealing portion is far away from the first connecting hole. The outer diameter of the first sealing portion is larger than the inner diameter of the connecting pipe (12), and the outer diameter of the third sealing portion is larger than the inner diameter of the fastening nut (10).

9. The terminal box according to claim 7, characterized in that: The cable fastening mechanism further comprises a clamping ring (13), the clamping ring (13) being provided with a notch, and the outer diameter of the clamping ring (13) gradually decreasing from one side to the other side thereof, so that the outer side surface of the clamping ring (13) is an inclined surface, the clamping ring (13) is located in the fastening nut (10), and the clamping ring (13) is located between the port sealing ring (11) and the retaining edge, the side of the clamping ring (13) with a smaller outer diameter is close to the retaining edge, and the inner wall of the fastening nut (10) provided with an internal thread is an inclined surface with the same inclination as the outer side surface of the clamping ring (13).

10. The terminal box according to claim 9, characterized in that: The cable fastening mechanism comprises a flat washer (14), and the flat washer (14) is located between the port sealing ring (11) and the clamping ring (13).

Images