Junction box

Abstract

The utility model discloses a junction box, which comprises a box body, a positive terminal, a negative terminal and a shielding piece, the positive terminal and the negative terminal are arranged in the box body at an interval and are respectively connected with a wiring harness assembly, the shielding piece is embedded in the box body, and the shielding piece comprises two shielding rings, a grounding part and a connection part, the two shielding rings are arranged at the connecting position of the positive terminal and the wire harness assembly and the connecting position of the negative terminal and the wire harness assembly in a surrounding mode respectively, the box body is provided with an annular embedding groove allowing the grounding part to be embedded therein, and the connecting part is connected with the shielding rings and the grounding part. And the shielding ring, the grounding part and the connection part are integrally formed parts. The shielding piece adopts an integrated design, the dual functions of electromagnetic shielding and grounding conduction are realized at the same time, and the reliability of electrical connection is ensured through an optimized contact structure.

Description

Technical Field

[0001] This application relates to the technical field of junction boxes, and more particularly to a junction box. Background Technology

[0002] In the traditional design of industrial control and electronic equipment, the integration of control panels and functional modules often adopts a separate component structure. Each module (such as the display screen, user interface, and circuit unit) is assembled with an independent housing and shielding layer, resulting in a complex overall structure, low assembly efficiency, and the physical seams between multiple components easily forming electromagnetic leakage paths, weakening shielding effectiveness. Furthermore, the separate shielding structure relies on a metal frame and multiple layers of shielding, increasing material costs and processing steps. The complex assembly nodes are also prone to contact failure due to vibration or thermal stress during long-term use, further reducing system reliability. Utility Model Content

[0003] The purpose of this application is to provide a junction box with an integrated shielding design that simultaneously achieves electromagnetic shielding and grounding conduction functions, and ensures the reliability of electrical connections through an optimized contact structure.

[0004] To achieve the above objectives, this application adopts the following technical solution:

[0005] On one hand, a junction box is provided, comprising: a box body, a positive terminal, a negative terminal, and a shielding component. The positive terminal and the negative terminal are spaced apart within the box body and are respectively connected to a wiring harness assembly. The shielding component is fitted into the box body and includes two shielding rings, a grounding portion, and a connecting portion. The two shielding rings are respectively positioned around the connection points of the positive terminal and the wiring harness assembly, and the connection points of the negative terminal and the wiring harness assembly. The box body has an annular embedding groove for embedding the grounding portion. The connecting portion connects the shielding rings and the grounding portion, and the shielding rings, the grounding portion, and the connecting portion are integrally formed.

[0006] Furthermore, the housing includes a base and a top cover. The base is provided with a metal connector connecting the positive terminal and the negative terminal, and the top cover is provided with a fusible component connected to the metal connector.

[0007] Furthermore, the base is provided with a receiving cavity, and a partition is provided in the receiving cavity. The partition divides the receiving cavity into a first region and a second region. The first region is used to accommodate the connecting end of the metal connector, and the second region is used to accommodate the connecting ends of the positive terminal and the negative terminal.

[0008] Furthermore, a baffle is movably provided at the top of the second region, which, after sliding, is used to cover either the connection end of the positive terminal or the connection end of the negative terminal.

[0009] Furthermore, the top surface of the baffle is provided with auxiliary protrusions for assisting pushing and pulling.

[0010] Furthermore, a sealing ring is provided at the connection point between the base and the top cover.

[0011] Furthermore, the outer wall of the accommodating cavity is provided with a plurality of reinforcing ribs, and the reinforcing ribs are provided with threaded holes. The upper cover is provided with a through hole corresponding to the threaded hole. After the upper cover is matched and connected with the base, it is locked in the threaded hole by fasteners passing through the through hole.

[0012] Furthermore, the non-connecting areas of the metal connector are wrapped with insulating adhesive.

[0013] Furthermore, the grounding part is ring-shaped, and its inner side is provided with connecting threads.

[0014] Furthermore, the outer peripheral wall of the grounding part is integrally formed with a stepped portion that connects to the connecting portion.

[0015] The beneficial effects of this application are as follows: The junction box adopts an integrated shielding design, with the shielding ring tightly wrapping the connection points of the positive and negative terminals and the wiring harness, forming a local electromagnetic enclosure that blocks the radiation or intrusion path of electromagnetic interference. The shielding component is integrally formed from the shielding ring, grounding part, and connecting part, eliminating the seams of traditional split structures and reducing electromagnetic leakage paths. After the grounding part is embedded in the box, it forms a conductive path with the external grounding terminal through the grounding structure on the box, ensuring effective discharge of interference current; the connecting part maintains the electrical continuity between the shielding ring and the grounding part, avoiding poor contact problems. The integrally formed structure physically enhances rigidity, reduces the risk of deformation caused by vibration or thermal stress, and ensures the long-term stability of shielding and grounding functions. Attached Figure Description

[0016] The present application will now be described in further detail with reference to the accompanying drawings and embodiments.

[0017] Figure 1 This is a perspective view of the junction box described in the embodiment of this application;

[0018] Figure 2 This is an exploded view of the junction box described in the embodiment of this application;

[0019] Figure 3 This is a perspective view of the shielding component described in the embodiments of this application;

[0020] Figure 4 This is a perspective view of the base described in the embodiment of this application;

[0021] Figure 5 The three-dimensional form of the baffle described in the embodiments of this application Figure 1 ;

[0022] Figure 6 The three-dimensional form of the baffle described in the embodiments of this application Figure 2 ;

[0023] Figure 7 This is an assembly diagram of the shielding component and the elastic fixing component described in the embodiments of this application.

[0024] In the diagram: 1. Box body; 101. Base; 102. Top cover; 103. Receiving cavity; 104. Isolation component; 105. Reinforcing rib; 1031. First area; 1032. Second area; 1041. Limiting rib; 1051. Threaded hole; 2. Positive terminal; 3. Negative terminal; 4. Shielding component; 401. Shielding ring; 402. Grounding part; 403. Connecting part; 404. Stepped part; 5. Wiring harness assembly; 6. Metal connector; 7. Fusible assembly; 8. Baffle; 801. Limiting protrusion; 802. Auxiliary protrusion; 9. Sealing ring; 10. Fastener; 11. Elastic wire fixing component; 1101. Hollowed-out groove; 1102. Spring. Detailed Implementation

[0025] To make the technical problems solved by this application, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the embodiments of this application are further described in detail below. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0026] In the description of this application, unless otherwise expressly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0027] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0028] like Figures 1 to 6 As shown, this embodiment provides a junction box, including: a box body 1, a positive terminal 2, a negative terminal 3, and a shielding component 4. The positive terminal 2 and the negative terminal 3 are spaced apart within the box body 1 and are respectively connected to a wiring harness assembly 5. The shielding component 4 is fitted into the box body 1. The shielding component 4 includes two shielding rings 401, a grounding portion 402, and a connecting portion 403. The two shielding rings 401 are respectively arranged around the connection position between the positive terminal 2 and the wiring harness assembly 5, and the connection position between the negative terminal 3 and the wiring harness assembly 5. The box body 1 has an annular embedding groove for the grounding portion 402 to be embedded. The connecting portion 403 connects the shielding rings 401 and the grounding portion 402, and the shielding rings 401, the grounding portion 402, and the connecting portion 403 are integrally formed parts.

[0029] Based on the above scheme, the electromagnetic shielding and grounding functions are deeply integrated through the structural design of the integrated shielding component 4. The two shielding rings 401 of the shielding component 4 respectively wrap around the connection points of the positive and negative terminals 3 and the wiring harness assembly 5, forming a closed electromagnetic isolation space to block internal and external electromagnetic interference. The grounding part 402 is embedded in the pre-set annular groove of the housing 1, and is connected to the external grounding system through the grounding interface integrated in the housing 1, constructing a low-impedance discharge channel. The connecting part 403 ensures the electrical continuity from the shielding layer to the grounding end. The shielding component 4 adopts an integrated molding process, eliminating the seams and mechanical connection nodes of traditional split structures, fundamentally avoiding the risk of electromagnetic leakage and contact failure, while enhancing structural rigidity to withstand vibration and temperature stress. Based on the above working principle, this design simultaneously achieves multiple optimizations: functionally, it integrates shielding and grounding, simplifying the complex architecture of multi-layer component stacking; in terms of electrical performance, it reduces contact impedance and improves reliability through seamless conduction paths; in terms of manufacturing process, it reduces the number of parts and assembly steps, lowering costs; in terms of environmental adaptability, the rigid structure without loose nodes extends service life; and its modular form is suitable for high-density integration scenarios, making it widely applicable in fields with stringent electromagnetic compatibility and reliability requirements, such as industrial control and new energy vehicles.

[0030] Furthermore, the housing 1 includes a base 101 and a top cover 102. The base 101 is provided with a metal connector 6 connecting the positive terminal 2 and the negative terminal 3. The top cover 102 is provided with a fuse assembly 7 connected to the metal connector 6. The housing 1 adopts a separate design for the base 101 and the top cover 102. The metal connector 6 inside the base 101 is directly connected to the positive terminal 2 and the negative terminal 3, forming a stable electrical transmission path. The top cover 102 integrates the fuse assembly 7, whose input end connects to the metal connector 6 of the base 101 via contacts or a plug-in structure, and whose output end connects to an external load circuit. When an overload or short circuit occurs in the circuit, the fuse assembly 7 triggers a fusing mechanism based on the current signal transmitted by the metal connector 6, quickly cutting off the abnormal current path to prevent equipment damage; alternatively, when the top cover 102 detaches from the base 101, the current path can be switched. The split structure allows the fuse component 7 to be independent of the circuit layout of the base 101, which ensures the timeliness of overcurrent protection and avoids the physical impact of the fuse action on the shielding structure of the main circuit (such as the shielding ring 401). At the same time, the fitting design of the base 101 and the top cover 102 maintains the continuity of the overall shielding layer and prevents the fuse area from becoming an electromagnetic leakage point.

[0031] In some embodiments, the base 101 is provided with a receiving cavity 103, and a partition is provided within the receiving cavity 103. The partition divides the receiving cavity 103 into a first region 1031 and a second region 1032. The first region 1031 is used to accommodate the connection end of the metal connector 6, and the second region 1032 is used to accommodate the connection ends of the positive terminal 2 and the negative terminal 3. The partition forms independent spatial partitions through physical isolation. On the one hand, it blocks direct contact between the metal connector 6 and the terminals, avoiding electrical faults caused by metal debris, liquid intrusion, or accidental short circuits. On the other hand, the partition can be made of insulating or magnetically conductive materials to optimize the different electromagnetic characteristics of the first region 1031 (high current transmission region) and the second region 1032 (terminal connection region). For example, the first region 1031 uses a metal partition to enhance electromagnetic shielding and suppress the conduction of high-frequency interference from the power supply side to the terminal side, while the second region 1032 uses an insulating partition to isolate the risk of contamination of the terminal connection by the external environment.

[0032] In this design, a baffle 8 is movably mounted on the top of the second region 1032. This baffle 8, when slidable, covers either the connection end of the positive terminal 2 or the connection end of the negative terminal 3. The sliding baffle 8 on the top of the second region 1032 achieves physical isolation between the positive terminal 2 and the negative terminal 3 through a mechanical interlock design: when the baffle 8 slides along a preset track, its structural dimensions match the terminal layout, ensuring that only one terminal connection port (e.g., positive or negative) is exposed at any given time, while the other terminal remains covered by the baffle 8. The sliding stroke of the baffle 8 is limited by the track limiting structure. During operation, the baffle 8 must be pushed to the target position (e.g., the positive terminal 2 side) by external force, at which point the baffle 8 completely covers the negative terminal 3, and vice versa. This forced coverage mechanism forms a physical barrier during wiring, preventing simultaneous contact with two terminals of opposite polarity even if the operating tool or wiring harness is accidentally deviated, thus completely blocking short-circuit paths. In addition, the baffle 8 is made of insulating material or has an insulating layer on its surface to further reduce the risk of leakage. At the same time, its sliding trajectory is designed to be offset from the terminal wiring direction, so that wiring can be completed without removing the baffle 8 during operation, taking into account both safety and convenience.

[0033] Specifically, the second region 1032 is provided with an isolating member 104 for isolating the positive terminal 2 and the negative terminal 3. The isolating member 104 has limiting ribs 1041 at both ends of its top surface relative to the baffle 8. The bottom surface of the baffle 8 has limiting protrusions 801 that slide and limit the limiting ribs 1041. The limiting protrusions 801 are arranged in an array. This limiting mechanism, through the rigid engagement of the protrusions and ribs, forcibly constrains the movement range of the baffle 8, ensuring that at least one terminal connection port is always covered during operation. Simultaneously, the arrayed protrusions evenly distribute sliding friction, avoiding jamming caused by single-point wear. Furthermore, the engagement depth and gap between the limiting ribs 1041 and the protrusions are precisely designed to ensure smooth sliding of the baffle 8 while preventing the baffle 8 from accidentally derailing under vibration or external impact.

[0034] Meanwhile, the top surface of the baffle 8 is provided with an auxiliary protrusion 802 for assisting in pushing and pulling. The auxiliary protrusion 802 on the top surface of the baffle 8 optimizes the operating experience through ergonomic design: the surface of the auxiliary protrusion 802 is made of anti-slip texture or soft coating to increase the friction of finger contact, making it easier to apply force to push the baffle 8 in narrow spaces; the shape of the auxiliary protrusion 802 (such as arc or wave shape) is adapted to the contour of the finger, reducing fatigue during long-term operation. The position of the auxiliary protrusion 802 avoids the interference area between the baffle 8 and the upper cover 102 and the wiring harness assembly 5, ensuring that the pushing and pulling action only moves unidirectionally along the preset track, preventing the baffle 8 from shifting due to accidental touch.

[0035] Preferably, a sealing ring 9 is provided at the connection position between the base 101 and the upper cover 102. The sealing ring 9 at the connection position of the base 101 and the upper cover 102 fills the assembly gap between them through the compression deformation of the elastic material, forming a physical sealing barrier. Specifically, the sealing ring 9 is embedded in a pre-set annular groove in the base 101 or the upper cover 102. When the base 101 and the upper cover 102 are fixed by a buckle or bolt, the sealing ring 9 is compressed and expands, tightly fitting the contact surface, effectively preventing external liquids (such as rainwater, oil), dust, and other contaminants from intruding into the box 1. Furthermore, if the sealing ring 9 is made of a conductive material (such as conductive rubber), it not only achieves environmental sealing but also cooperates with the conductive shells of the base 101 and the upper cover 102 to maintain the electrical continuity of the shielding layer at the connection point, blocking the path of electromagnetic waves leakage through the assembly gap. The cross-sectional shape of the sealing ring 9 (such as O-ring or irregular shape) is designed to match the groove, ensuring uniform force after compression and avoiding sealing failure caused by local deformation.

[0036] It is worth mentioning that the outer wall of the accommodating cavity 103 is provided with multiple reinforcing ribs 105, and each reinforcing rib 105 is provided with a threaded hole 1051. The upper cover 102 is provided with a through hole corresponding to the threaded hole 1051. After the upper cover 102 is matched and connected to the base 101, it is locked in place by a fastener 10 through the through hole and into the threaded hole 1051. The multiple reinforcing ribs 105 provided on the outer wall of the accommodating cavity 103 improve the overall structural strength of the base 101 through geometric topology optimization. Their distribution direction is consistent with the force direction of the cavity (such as vertical bearing pressure or horizontal bending resistance), effectively dispersing external mechanical loads. The pre-made threaded hole 1051 on the reinforcing rib 105 is coaxially aligned with the through hole of the upper cover 102. When the base 101 and the upper cover 102 are assembled, the fastener 10 (such as a bolt) passes through the through hole and screws into the threaded hole 1051, achieving rigid locking through the thread engagement force. This connection method transforms the traditional single-point fixing of snap-fit ​​or adhesive bonding into multi-point distributed mechanical locking. Combined with the supporting effect of the reinforcing rib 105, it significantly reduces the risk of deformation at the connection point caused by vibration, impact, or thermal stress. At the same time, the mating depth between the threaded hole 1051 and the fastener 10 is adjustable, allowing for fine-tuning of the locking force according to the compression of the sealing ring 9 or the alignment requirements of the shielding component 4, ensuring the stability of the seal and electrical connection.

[0037] In some embodiments, the non-connection areas of the metal connector 6 are wrapped with insulating adhesive. In this design, the metal connector 6 is molded by overmolding, resulting in insulating adhesive in the non-connection areas, exposing only the metal structure at the points where bolt connections and the fuse assembly 7 interlock, thereby connecting the positive or negative electrode to the fuse assembly 7 for conduction. The insulating adhesive layer precisely covers the non-conductive contact areas, completely isolating the risk of accidental short circuits from adjacent metal components or the external environment, significantly improving electrical safety. Furthermore, the integrated overmolding process maximizes the structural integration of insulation protection and the metal conductor, avoiding alignment errors and gap hazards during the assembly of traditional insulating sleeves or insulating sheets, while also enhancing the overall resistance of the metal connector 6 to mechanical stress and vibration.

[0038] Furthermore, the grounding part 402 is ring-shaped, with connecting threads on its inner side. The ring structure increases the effective conductive area through a uniform circumferential contact surface, reduces local current density and contact resistance, and avoids abnormal temperature rise caused by poor contact. The inner threads are directly integrated into the grounding part 402 body, eliminating the need for additional welding or nested threaded components. This simplifies the processing flow, such as integral stamping or precision casting, and avoids the risk of tolerance accumulation and loosening caused by assembling multiple parts, ensuring the coaxiality and engagement strength of the threaded connection.

[0039] Meanwhile, the outer peripheral wall of the grounding part 402 is integrally formed with a stepped part 404 that is connected to the connecting part 403. The design of the stepped part 404 achieves high-precision assembly of the grounding part 402 and the box 1 in the annular embedded groove through geometric adaptation.

[0040] In addition, such as Figure 7 As shown, an elastic wire-fixing member 11 is provided on the side of the shielding ring 401 away from the receiving cavity, which is sleeved on the wire harness assembly 5. The elastic wire-fixing member 11 has a plurality of hollow grooves 1101 along its circumference. A spring piece 1102 is provided in the hollow groove 1101. When the wire harness assembly 5 is inserted, the outer surface of the wire harness assembly 5 will abut against the spring piece 1102 and deform it. The elastic compression force of the spring piece 1102 can effectively fix the wire harness assembly 5. When the wire harness assembly 5 is pulled out, the spring piece 1102 springs back to its original shape, so it can be used multiple times.

[0041] Generally, both the positive terminal 2 and the negative terminal 3 are equipped with self-locking clamping mechanisms at their terminals. These mechanisms include elastic metal flaps, with the free end of each flap forming an inwardly bent guide clip. The self-locking clamping mechanism achieves rapid fixation and reliable connection of the wire harness assembly 5 through the deformation and reset of the elastic metal flaps: when the wire harness assembly 5 is inserted into the terminal terminal, its outer wall presses against the inwardly bent guide clip of the elastic metal flap, forcing the flap to expand elastically outward; when the wire harness assembly 5 is inserted to a preset depth, the flap resets due to its own rebound force, and its guide clip tightens inward, forming a ring-shaped clamping grip with the surface of the wire harness assembly 5. Simultaneously, the bent structure of the clip embeds into the insulation layer or conductor gap of the wire harness assembly 5, forming a mechanical interlock. During this process, the arc-shaped inner wall of the guide clip provides insertion guidance, preventing the wire harness assembly 5 from deflecting, while the continuous clamping force generated by the elastic deformation of the flaps ensures low-impedance contact between the wire harness assembly 5 and the terminal conductor, eliminating the need for additional tools or bolts for tightening. In addition, the self-locking mechanism corresponds to the position of the shielding ring 401 of the shielding component 4. After the wire harness assembly 5 is inserted, its shielding layer can be connected to the grounding part 402 through the shielding ring 401, so as to realize the integration of electrical connection and shielding.

[0042] Specifically, the outer wall of the housing 1 is provided with at least one modular expansion interface, which includes: a dovetail-shaped snap-fit ​​track extending along the edge of the housing 1, an anti-detachment limiting boss located at the end of the snap-fit ​​track, and a conductive plug-in terminal group embedded in the side wall of the housing 1. The dovetail-shaped snap-fit ​​track extends along the edge of the housing 1, providing a standardized sliding installation path for additional modules (such as signal converters, redundant power supply units, etc.). The module slides into the track through the matching dovetail groove until it is blocked and locked by the anti-detachment limiting boss at the end of the track, forming a tool-free quick assembly; the conductive plug-in terminal group is embedded in the side wall of the housing 1 and is connected to the internal main circuit. When the additional module is installed in place, its interface terminals automatically align and contact with the conductive plug-in terminal group of the housing 1, establishing an electrical connection. In this design, the dovetail track and the limiting boss ensure the physical positioning accuracy of the module and prevent displacement caused by vibration, while the elastic contact design of the conductive terminal group compensates for assembly tolerances and ensures the reliability of the electrical connection. In addition, the shielding layer of the housing 1 is connected to the shielding structure of the additional module through conductive plug-in terminal group, maintaining the overall electromagnetic shielding integrity after expansion.

[0043] In the description herein, it should be understood that the terms "upper," "lower," "left," "right," and other orientations or positional relationships are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used merely for descriptive distinction and have no special meaning.

[0044] In the description of this specification, references to terms such as "an embodiment," "example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0045] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment includes only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0046] The technical principles of this application have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of this application and should not be construed as limiting the scope of protection of this application in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of this application without inventive effort, and these embodiments will all fall within the scope of protection of this application.

Claims

1. A junction box, characterized in that, include: The box (1), positive terminal (2), negative terminal (3) and shield (4) are provided. The positive terminal (2) and the negative terminal (3) are spaced apart in the box (1) and are respectively connected to the wire harness assembly (5). The shield (4) is fitted into the box (1). The shield (4) includes two shielding rings (401), a grounding part (402) and a connecting part (403). The two shielding rings (401) are respectively arranged around the connection position of the positive terminal (2) and the wire harness assembly (5) and the connection position of the negative terminal (3) and the wire harness assembly (5). The box (1) has an annular embedding groove for the grounding part (402) to be embedded. The connecting part (403) connects the shielding ring (401) and the grounding part (402). The shielding ring (401), the grounding part (402) and the connecting part (403) are integrally formed.

2. The junction box according to claim 1, characterized in that, The box body (1) includes a base (101) and a top cover (102). The base (101) is provided with a metal connector (6) connecting the positive terminal (2) and the negative terminal (3). The top cover (102) is provided with a fuse assembly (7) connected to the metal connector (6).

3. The junction box according to claim 2, characterized in that, The base (101) is provided with a receiving cavity (103), and a partition is provided in the receiving cavity (103). The partition divides the receiving cavity (103) into a first region (1031) and a second region (1032). The first region (1031) is used to accommodate the connecting end of the metal connector (6), and the second region (1032) is used to accommodate the connecting ends of the positive terminal (2) and the negative terminal (3).

4. The junction box according to claim 3, characterized in that, A baffle (8) is movably provided on the top of the second region (1032). After sliding, the baffle (8) is used to cover either the connection end of the positive terminal (2) or the connection end of the negative terminal (3).

5. The junction box according to claim 4, characterized in that, The top surface of the baffle (8) is provided with an auxiliary protrusion (802) for assisting pushing and pulling.

6. The junction box according to claim 2, characterized in that, A sealing ring (9) is provided at the connection position between the base (101) and the top cover (102).

7. The junction box according to claim 3, characterized in that, The outer wall of the accommodating cavity (103) is provided with a plurality of reinforcing ribs (105), and the reinforcing ribs (105) are provided with threaded holes (1051). The upper cover (102) is provided with a through hole corresponding to the threaded hole (1051). After the upper cover (102) is matched and connected to the base (101), it is locked to the threaded hole (1051) by fasteners (10) passing through the through hole.

8. The junction box according to claim 2, characterized in that, The non-connection areas of the metal connector (6) are covered with insulating adhesive.

9. The junction box according to any one of claims 1-8, characterized in that, The grounding part (402) is ring-shaped, and its inner side is provided with connecting threads.

10. The junction box according to any one of claims 1-8, characterized in that, The outer peripheral wall of the grounding part (402) is integrally formed with a stepped part (404) that is connected to the connecting part (403).

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