Alternating current charging pile extension branch box and branch power supply method thereof

Abstract

This invention relates to an AC charging pile expansion branch box and its branch power supply method. The box includes an insulated enclosure housing a main disconnect switch, an inlet interface, an insulating support plate, a horizontal conductive busbar, a protective grounding conductor, mounting rails, and multiple branch disconnect switches. The inlet terminal of the main disconnect switch forms an inlet interface for connecting to an external single-circuit power supply. The main disconnect switch, the insulating support plate, and the multiple branch disconnect switches are respectively connected to the mounting rails. The insulating support plate is vertically arranged, and the horizontal conductive busbar is fixed to the insulating support plate and parallel to each other. The horizontal conductive busbar includes a phase busbar and a neutral busbar, with the phase busbar electrically connected to the outlet terminal of the main disconnect switch. The multiple branch disconnect switches are arranged side-by-side below the horizontal conductive busbar, with their inlet terminals electrically connected to the corresponding phase busbar and / or neutral busbar, and their outlet terminals connected to the corresponding charging pile cables. This invention improves the safety of capacity expansion.

Description

Technical Field

[0001] This invention belongs to the technical field of AC charging pile power distribution expansion devices, and in particular relates to an AC charging pile expansion branch box and its branch power supply method. Background Technology

[0002] Currently, with the continuous increase in the number of electric vehicles in residential communities, especially older communities, the demand for AC charging piles is constantly rising. However, existing low-voltage power distribution facilities are usually limited by the original power distribution capacity, the number of spare switches, the installation space of the enclosure, and the on-site wiring conditions. In the scenario of centralized addition, AC charging piles are easily constrained by the number of connections and installation conditions.

[0003] The existing AC charging pile access method usually involves branching the existing low-voltage outgoing line to enable power supply access for multiple charging loads. However, with the increase in the number of branches, problems such as a larger maintenance impact range, increased risk of overheating at the wiring location, poor wiring regularity inside the box, and inconvenience for subsequent expansion are likely to occur. Summary of the Invention

[0004] The purpose of this invention is to provide an AC charging pile extension branch box and its branch power supply method to solve the technical problem that the existing AC charging pile access method has poor expansion flexibility and operational reliability due to the concentrated access of multiple branch loads to the same power distribution node.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: In a first aspect, the present invention provides an AC charging pile extension branch box, comprising an insulating box, a main disconnect switch disposed within the insulating box, an incoming line interface, an insulating support plate, a horizontal conductive busbar, a protective grounding conductor, a mounting rail, and multiple branch disconnect switches; The incoming terminal of the main disconnect switch forms an incoming interface, which is used to connect to an external single power supply. The mounting rail is disposed inside the insulating box, and the main disconnect switch, the insulating support plate, and the multiple branch disconnect switches are respectively connected to the mounting rail; The insulating support plate is vertically installed inside the insulating box. The horizontal conductive busbar is fixed on the insulating support plate, and multiple horizontal conductive busbars are arranged parallel to each other. The horizontal conductive busbar includes a phase busbar and a neutral busbar. The phase busbar is electrically connected to the outgoing terminal of the main disconnect switch. Multiple branch disconnect switches are arranged side by side below the horizontal conductive busbar. The incoming terminal of each branch disconnect switch is electrically connected to the corresponding phase busbar and / or the neutral busbar, and the outgoing terminal of each branch disconnect switch is used to connect to the corresponding charging pile cable. The protective grounding conductor is installed inside the insulating box and connected to the protective grounding wire of each charging pile cable.

[0006] By adopting the above technical solution, and by setting up an insulating enclosure, a main disconnect switch, and an inlet interface consisting of the inlet terminal of the main disconnect switch, the access point of the external single power supply and the overall control and isolation point of the power supply in the whole box can be unified into the same device system. This makes the main path of the power supply after entering the branch box clearer, thereby facilitating unified management of the power supply status of the whole box during installation, power supply, power outage, and maintenance, and reducing the operational complexity caused by multiple access points and multiple disconnect points. By setting up mounting rails and connecting the main disconnect switch, insulating support plate, and multiple branch disconnect switches to the mounting rails, different functional components inside the box can form a stable installation foundation and a clear hierarchical layout relationship. This gives each component a relatively fixed position and assembly benchmark inside the box, thereby improving the regularity of the internal structure of the whole box and facilitating batch assembly, on-site maintenance, and subsequent branch circuit adjustments. By vertically setting the insulating support plate inside the insulating enclosure and fixing the parallel phase busbars on it, the overall structure is more organized. The system integrates a neutral busbar and a phase busbar, electrically connecting the phase busbars to the outgoing terminals of the main disconnect switch. This creates a main power supply framework within the box, distributing power from the main disconnect switch to multiple branch circuits. This ensures that the phase distribution paths, neutral distribution paths, and insulation support relationships correspond, reducing disorderly conductor crossings, improving the clarity of the busbar layout, and enhancing power supply stability under multi-branch distribution conditions. Furthermore, by arranging multiple branch disconnect switches parallel below the horizontal conductive busbar and electrically connecting them to their respective phase busbars and / or neutral busbars, and by connecting protective grounding conductors to the protective grounding wires of each charging pile cable, each charging pile branch can form a relatively independent on / off control path and a unified protective grounding convergence path. This prevents any branch from directly affecting the basic power supply structure of other branches during connection, disconnection, or maintenance, thereby reducing the impact of local faults or maintenance on the overall usage range and improving operational reliability and maintenance convenience in centralized AC charging pile access scenarios.

[0007] In one example, the present invention can be further configured such that: the mounting rails include multiple mounting rails spaced apart in a horizontal direction, and the main disconnect switch, the insulating support plate, and the multiple branch disconnect switches are respectively connected to the corresponding mounting rails.

[0008] By adopting the above technical solution, and by setting multiple horizontally spaced mounting rails, and connecting the main disconnect switch, the insulating support plate, and multiple branch disconnect switches to their respective mounting rails, the main disconnect switch, the insulating support plate, and multiple branch disconnect switches can form distinct installation layers and load-bearing relationships within the insulating enclosure. This avoids space encroachment and assembly interference caused by the concentrated installation of different functional components in a single location, thus making the internal structural layout of the enclosure clearer. This not only improves the stability of the components after installation but also helps maintain the orderly arrangement of the entire enclosure when increasing the number of branch disconnect switches, further enhancing the assembly flexibility and expansion adaptability of the branch enclosure.

[0009] In one example, the present invention can be further configured as follows: the horizontal conductive busbar includes three phase busbars and one neutral busbar, the three phase busbars and the neutral busbar are arranged at intervals in the vertical direction and fixed on the insulating support plate, and the three phase busbars and the neutral busbar are arranged parallel to each other.

[0010] By adopting the above technical solution, and by setting up multiple phase busbars and one neutral busbar, and arranging the multiple phase busbars and the neutral busbar vertically at intervals and fixed on the insulating support plate, the phase path and the neutral path can form a layered, separated, and orderly arrangement in the same power distribution area. This makes the correspondence between different conductive paths clearer, which is beneficial for accurately distinguishing the access positions of different branches when multiple branch disconnect switches draw power separately, reducing wiring confusion and connection identification difficulties, and improving the standardization and consistency of the busbar power distribution structure inside the box. By limiting the multiple phase busbars to three phase busbars and setting the three phase busbars and the one neutral busbar parallel to each other, the branch box can form a basic power distribution structure corresponding to the three-phase AC power supply scenario. This allows each branch circuit to be orderly distributed around the three phase busbars and the one neutral busbar, thereby better adapting to the power supply access requirements of AC charging piles, avoiding the limitation of branch layout caused by unclear phase configuration, and helping to maintain the uniformity and identifiability of the power distribution structure when multiple charging pile branches are connected at the same time.

[0011] In one example, the present invention can be further configured such that: a plurality of branch disconnect switches are arranged side by side at intervals along the length direction of the horizontal conductive busbar, and each branch disconnect switch is located below the horizontal conductive busbar.

[0012] By adopting the above technical solution, and by arranging multiple branch disconnect switches in parallel at intervals along the length of the horizontal conductive busbar, with each branch disconnect switch located below the horizontal conductive busbar, a clear spatial correspondence can be formed between each branch disconnect switch and its corresponding busbar position above it. This makes it easier to distinguish the incoming connection position and outgoing control position of the branch disconnect switch, thereby facilitating branch-by-branch wiring, branch-by-branch inspection, and branch-by-branch maintenance. Furthermore, it allows multiple branches to be arranged in a regular manner within the box, further improving the internal layout order when there are many branch circuits, and enhancing the convenience of subsequent maintenance, capacity expansion, and fault location.

[0013] In one example, the present invention can be further configured such that each branch disconnect switch is a single-pole disconnect switch or a two-pole disconnect switch.

[0014] By adopting the above technical solution and setting each branch disconnect switch as a single-pole disconnect switch or a two-pole disconnect switch, the branch box can have a certain structural adaptability when facing different branch wiring conditions and different charging pile power distribution requirements. This makes the branch isolation control method not limited to a single form, thus enabling more flexible matching of wiring requirements in actual installation scenarios, reducing the adaptation limitations caused by fixed branch control forms, and improving the compatibility and application scope of the branch box for different AC charging pile access methods.

[0015] In one example, the present invention can be further configured such that: a high-current crimping terminal and a plurality of low-current crimping terminals are provided on the protective grounding conductor, the high-current crimping terminal is used to connect to the main grounding wire, and the plurality of low-current crimping terminals are used to connect to the protective grounding wires of each charging pile cable.

[0016] By adopting the above technical solution, and by setting high-current crimp terminals and multiple low-current crimp terminals on the protective grounding conductor, with the high-current crimp terminals used to connect the main grounding wire and the multiple low-current crimp terminals used to connect the protective grounding wires of each charging pile cable, the main grounding path and multiple branch protective grounding paths can be centralized on the same protective grounding conductor for hierarchical connection. This makes the connection relationship between the main grounding wire and each branch protective grounding wire clearer, thereby improving the clarity of the grounding loop organization, reducing the confusion caused by the scattered connection of multiple protective grounding wires, and facilitating unified management and circuit-by-circuit inspection of the protective grounding status of each charging pile branch, further improving the reliability of the overall grounding connection.

[0017] In one example, the present invention can be further configured such that: the protective grounding conductor is located below the insulating support plate, the high-current crimping terminal and a plurality of the low-current crimping terminals are disposed on the protective grounding conductor, and the plurality of the low-current crimping terminals are spaced apart along the length direction of the protective grounding conductor.

[0018] By adopting the above technical solution, and by placing the protective grounding conductor below the insulating support plate, and placing the high-current crimping terminal and multiple low-current crimping terminals on the protective grounding conductor, with the multiple low-current crimping terminals spaced apart along the length of the protective grounding conductor, the protective grounding connection area can form a vertically separated layout from the main power distribution area where the phase busbar and neutral busbar are located. This allows the introduction, crimping, and arrangement of the protective grounding wire to have relatively independent spatial positions, thereby reducing the situation where different types of conductors are intertwined in the same area, improving the orderliness of grounding wiring, and facilitating the identification, tightening, and inspection of the main grounding wire and the protective grounding wires of each branch in subsequent maintenance, further improving the maintenance convenience and connection stability of the protective grounding structure.

[0019] In one example, the present invention can be further configured such that: a cable fixing frame is provided inside the insulating box, and a plurality of snap-fit ​​cable fixing clips are provided on the cable fixing frame, the plurality of snap-fit ​​cable fixing clips being used to fix the cables entering and exiting the insulating box.

[0020] By adopting the above technical solution, and by setting a cable fixing frame inside the insulating box, and installing multiple snap-on cable fixing clips on the cable fixing frame to fix the cables entering and exiting the insulating box, continuous mechanical constraints can be provided for the external single power cables entering the branch box and the branch cables output to each charging pile. This keeps the cables in a relatively stable state near the transition position inside and outside the box and near the wiring position, thereby reducing the adverse effects of cable shaking, dragging, or long-term stress on the connection parts such as the main disconnect switch, branch disconnect switches, and protective grounding conductor. It also reduces the possibility of loosening or offset of the connection parts and improves the wiring stability and structural reliability of the entire box under long-term operating conditions.

[0021] In one example, the present invention can be further configured such that: the outer side of the insulating box is provided with a hanging ear type mounting structure, the hanging ear type mounting structure being used to mount the insulating box to an external support surface.

[0022] By adopting the above technical solution, and by setting a hanging ear-type installation structure on the outside of the insulating box, and using the hanging ear-type installation structure to install the insulating box on the external support surface, the branch box can form a more direct and clear external installation connection method. This allows the insulating box and its internal main disconnect switch, insulating support plate, horizontal conductive busbar, multiple branch disconnect switches and protective grounding conductor to obtain stable overall support after installation. This facilitates the quick completion of the entire box fixing on site, reduces the complexity caused by additional installation and conversion processes, and improves the installation convenience and overall stability of the branch box in actual application environments.

[0023] In a second aspect, the present invention provides a method for branch power supply to an AC charging pile extension box, the method comprising: Obtain the incoming line connection information of an external single power supply; The main disconnect switch is turned on according to the incoming line access information, and a power supply distribution relationship consisting of phase busbars and neutral busbars is established. Based on the power supply distribution relationship, configure the connection status of multiple branch disconnect switches with the corresponding phase busbars and / or neutral busbars to obtain multiple branch power supply paths corresponding to the charging pile cables; Based on the connectivity of each branch power supply path and the grounding connection of the protective grounding conductor, power is output to the corresponding charging pile cable.

[0024] By adopting the above technical solution, and by acquiring the incoming line access information of an external single power supply, the access status of the external power supply entering the AC charging pile expansion box can be identified and confirmed. This provides a clear input basis for the subsequent connection control of the main disconnect switch and the establishment of the power supply path within the box, avoiding direct branch power supply configuration when the incoming line status is unclear. By controlling the connection of the main disconnect switch according to the incoming line access information and constructing a power distribution relationship composed of phase busbars and neutral busbars, a main power supply path can be formed from the main input terminal to the busbar distribution terminal after the power supply is connected. This ensures that each branch circuit within the box is established on a unified and clear power supply framework, and improves the orderliness of power distribution when multiple charging pile branches are powered in parallel. By configuring multiple branch disconnect switches and corresponding phase busbars according to the power distribution relationship, the system can effectively address the power supply issues. By determining the connection status of the busbar and / or neutral busbar, multiple branch power supply paths corresponding to the charging pile cables are obtained. This allows different charging pile cables to correspond to independent power supply control paths, facilitating individual connection, disconnection, and management of different charging pile branches. It also reduces the possibility of adjustments to a single branch affecting the power supply status of other branches. By outputting power to the corresponding charging pile cables based on the connection status of each branch power supply path and the grounding connection status of the protective grounding conductor, the connection control of the branch can be completed while simultaneously establishing the protective grounding path. This ensures that each charging pile branch has a relatively complete power supply connection relationship and protective grounding relationship during power output, and improves the operational reliability and safety of the AC charging pile expansion box in multi-branch power supply scenarios. Attached Figure Description

[0025] The accompanying drawings, which form part of this specification, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a front view of the external structure of the AC charging pile extension branch box according to an embodiment of the present invention; Figure 2 This is a front view of the internal structure of the AC charging pile extension branch box (1 inlet, 10 outlets) according to an embodiment of the present invention. Figure 3 This is a power distribution system diagram of an AC charging pile expansion branch box with 1 inlet and 10 outlets according to an embodiment of the present invention; Figure 4 This is a front view of the internal structure of the AC charging pile extension branch box (1 inlet, 7 outlets) according to an embodiment of the present invention. Figure 5 This is a power distribution system diagram of an AC charging pile expansion branch box with 1 inlet and 7 outlets, according to an embodiment of the present invention. Figure 6 This is a comparison chart of simulated experimental data of the isolating switch and wiring terminals of the AC charging pile extension branch box according to an embodiment of the present invention; Figure 7 This is a flowchart of a branch power supply method for an AC charging pile extension branch box according to an embodiment of the present invention.

[0026] In the diagram, 1-insulating enclosure, 2-main disconnect switch, 3-incoming line interface, 4-insulating support plate, 5-horizontal conductive busbar, 51-phase busbar, 52-neutral busbar, 6-protective grounding conductor, 7-mounting rail, 81-high current crimp terminal, 82-low current crimp terminal, 9-cable fixing bracket, 91-snap-type cable fixing clip, 10-hanging ear type mounting structure, 11-branch disconnect switch. Detailed Implementation

[0027] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0028] The following detailed description is exemplary and intended to provide further detailed explanation of the invention. Unless otherwise specified, all technical terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this invention is for describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention.

[0029] Example 1 In one embodiment, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5As shown, this invention discloses an AC charging pile extension branch box, including an insulating box 1, a main disconnect switch 2 disposed within the insulating box 1, an inlet interface 3, an insulating support plate 4, a horizontal conductive busbar 5, a protective grounding conductor 6, mounting rails 7, and multiple branch disconnect switches 11. The inlet end of the main disconnect switch 2 forms the inlet interface 3, which is used to connect to an external single-circuit power supply. The mounting rails 7 are disposed within the insulating box 1 and are used to install the main disconnect switch 2, the insulating support plate 4, and the multiple branch disconnect switches 11. The insulating support plate 4 is vertically disposed within the insulating box 1. The horizontal conductive busbar 5 is fixed to the insulating support plate 4, and multiple horizontal conductive busbars 5 are arranged parallel to each other. The horizontal conductive busbar 5 includes a phase busbar 51 and a neutral busbar 52. The phase busbar 51 is electrically connected to the outlet end of the main disconnect switch 2. The multiple branch disconnect switches 11 are arranged side-by-side below the horizontal conductive busbar 5, and the inlet ends of each branch disconnect switch 11 are respectively... The circuit is electrically connected to the corresponding phase busbar 51 and / or neutral busbar 52. The outgoing terminals of each branch disconnect switch 11 are used to connect to the corresponding charging pile cable. The protective grounding conductor 6 is set inside the insulating box 1 and connected to the protective grounding wire of each charging pile cable. During assembly, the main disconnect switch 2, the insulating support plate 4 and multiple branch disconnect switches 11 are first fixed to the mounting rail 7. Then, the electrical connection between the phase busbar 51, the neutral busbar 52 and the main disconnect switch 2 and multiple branch disconnect switches 11 is completed. The protective grounding conductor 6 is connected to the protective grounding wire of each charging pile cable. During operation, the external single power supply is input to the main disconnect switch 2 through the input interface 3, distributed to the phase busbar 51 through the main disconnect switch 2, and then output to the corresponding charging pile cable by multiple branch disconnect switches 11. The neutral line is distributed through the neutral busbar 52, and the protective grounding wire is connected through the protective grounding conductor 6, thus forming a box power supply structure with single input, multiple distribution and separate control.

[0030] Furthermore, such as Figure 2 and Figure 4As shown, the mounting rails 7 include multiple mounting rails 7 spaced horizontally. These mounting rails 7 are arranged in layers from top to bottom within the insulating housing 1 to provide corresponding installation positions for the main disconnect switch 2, the insulating support plate 4, and multiple branch disconnect switches 11. During assembly, the main disconnect switch 2 is fixed to the upper mounting rail 7, the insulating support plate 4 is fixed to the middle mounting rail 7, and the multiple branch disconnect switches 11 are fixed to one or more lower mounting rails 7, creating a clear front-to-back, layered arrangement of the main disconnect switch 2, the insulating support plate 4, and the multiple branch disconnect switches 11 in the vertical direction. During operation, the mounting rails 7 provide stable support for the main disconnect switch 2, the insulating support plate 4, and the multiple branch disconnect switches 11, ensuring that the corresponding components do not loosen or shift during the transmission of the external single-circuit power supply introduced from the inlet interface 3 within the housing. This facilitates the overall assembly of the housing and the subsequent addition of multiple branch disconnect switches 11, improving assembly stability.

[0031] Furthermore, such as Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the horizontal conductive busbar 5 includes three phase busbars 51 and one neutral busbar 52. The three phase busbars 51 and the neutral busbar 52 are arranged vertically at intervals and fixed on the insulating support plate 4. The three phase busbars 51 and the neutral busbar 52 are arranged parallel to each other. The insulating support plate 4 provides insulation and position holding for the three phase busbars 51 and the neutral busbar 52, ensuring that the three phase busbars 51 and the neutral busbar 52 are arranged in an orderly manner within the same vertical power distribution area. During assembly, the three phase busbars 51 and the neutral busbar 52 are first fixed sequentially on the insulating support plate 4, and then the three phase busbars 51 are respectively connected to the main disconnect switch 2. The outgoing terminals should be electrically connected, and the incoming terminals of multiple branch disconnect switches 11 should be connected to the corresponding phase busbars 51 and / or neutral busbars 52 respectively, so as to form a power supply connection relationship corresponding to multiple charging pile cables. During operation, the external single power supply enters through the main disconnect switch 2 and is distributed to the three phase busbars 51 respectively. The neutral busbar 52 undertakes the unified distribution of the neutral line, so that multiple branch disconnect switches 11 can draw power from the corresponding phase busbars 51 and neutral busbars 52 respectively, and output power to the corresponding charging pile cables. This allows multiple charging pile cables to complete the three-phase branch access and neutral line distribution in the same insulating box 1, ensuring a clear power supply path in the box and improving the neatness of the wiring.

[0032] Furthermore, such as Figure 2 , Figure 3 , Figure 4 and Figure 5As shown, multiple branch disconnect switches 11 are arranged side-by-side at intervals along the length of the horizontal conductive busbar 5. Each branch disconnect switch 11 is located below the horizontal conductive busbar 5, and the multiple branch disconnect switches 11 and the upper horizontal conductive busbar 5 form a vertically corresponding connection. Each branch disconnect switch 11 is located below the phase busbar 51 and / or neutral busbar 52 to which it draws power. During assembly, the multiple branch disconnect switches 11 are sequentially fixed on the mounting rail 7 and unfolded horizontally to form a short-path connection between the incoming end of each branch disconnect switch 11 and the corresponding upper horizontal conductive busbar 5. During operation, each branch disconnect switch 11 controls the on / off of the corresponding charging pile cable in a spaced-side arrangement, ensuring that different charging pile cables are not confused during maintenance, disconnection, or connection. Figure 2 and Figure 3 As shown, this can create a parallel arrangement with a large number of paths, combined with Figure 4 and Figure 5 As shown, a smaller number of parallel routes can be formed, thus accommodating different numbers of charging pile cable connections and improving the convenience of expansion.

[0033] Furthermore, such as Figure 3 and Figure 5 Each branch disconnect switch 11 is either a single-pole disconnect switch or a double-pole disconnect switch. A single-pole disconnect switch corresponds to a control method where the phase line is introduced through the phase busbar 51, while a double-pole disconnect switch corresponds to a control method where both the phase busbar 51 and the neutral busbar 52 are introduced. During assembly, the corresponding branch disconnect switch 11 is selected according to the connection requirements of each charging pile cable. When a single-pole disconnect switch is used, the branch disconnect switch 11 is mainly connected to the corresponding phase busbar 51. When a double-pole disconnect switch is used, the branch disconnect switch 11 is connected to both the corresponding phase busbar 51 and the neutral busbar 52. During operation, the single-pole or double-pole disconnect switch independently controls the on / off state of the corresponding charging pile cable, allowing multiple charging pile cables to be connected, disconnected, and maintained separately. Figure 6 The diagram showing the comparison of simulation test data between the isolating switch and the terminal block of the AC charging pile extension branch box demonstrates that the connection method using the branch isolating switch 11 exhibits better connection stability and temperature rise performance under long-term power-on conditions, which is beneficial for the long-term operation of the AC charging pile and improves its operational reliability.

[0034] Furthermore, such as Figure 2 and Figure 4As shown, the protective grounding conductor 6 is equipped with a high-current crimp terminal 81 and multiple low-current crimp terminals 82. The high-current crimp terminal 81 is used to connect to the main grounding wire, and the multiple low-current crimp terminals 82 are used to connect to the protective grounding wires of each charging pile cable. The protective grounding conductor 6 thus forms a centralized connection point between the main grounding wire and the protective grounding wires of multiple charging pile cables. During assembly, the main grounding wire is crimped to the high-current crimp terminal 81, and the protective grounding wires of each charging pile cable are crimped to the multiple low-current crimp terminals 82 respectively. During operation, the protective grounding wires of multiple charging pile cables converge into the protective grounding conductor 6 through the corresponding low-current crimp terminals 82, and then connect to the main grounding wire through the high-current crimp terminal 81, thereby forming a unified protective grounding path.

[0035] Furthermore, such as Figure 2 and Figure 4 As shown, the protective grounding conductor 6 is located below the insulating support plate 4. A high-current crimp terminal 81 and multiple low-current crimp terminals 82 are installed on the protective grounding conductor 6. The multiple low-current crimp terminals 82 are spaced apart along the length of the protective grounding conductor 6, forming an independent grounding area below the insulating support plate 4, separate from the horizontal conductive busbar 5. During assembly, the protective grounding conductor 6 is first installed below the insulating support plate 4, and then the high-current crimp terminal 81 and multiple low-current crimp terminals 82 are arranged on the protective grounding conductor 6, with the multiple low-current crimp terminals 82 spaced apart to correspond to the protective grounding wires of multiple charging pile cables. During operation, the protective grounding wires of each charging pile cable enter the protective grounding conductor 6 from the corresponding low-current crimp terminal 82 and are uniformly grounded, thus separating the grounding connection from the phase and neutral line connections, making subsequent maintenance more convenient.

[0036] Furthermore, such as Figure 1 , Figure 2 and Figure 4 As shown, a cable fixing frame 9 is provided inside the insulating box 1. The cable fixing frame 9 is equipped with multiple snap-on cable fixing clips 91, which are used to fix the cables entering and exiting the insulating box 1. The cables entering and exiting the insulating box 1 include external single-circuit power cables connected through the inlet interface 3 and charging pile cables output from multiple branch disconnect switches 11 and connected to each charging pile. During assembly, the cables entering and exiting the insulating box 1 are guided to the cable fixing frame 9 and clamped and fixed one by one by the multiple snap-on cable fixing clips 91. During operation, the multiple snap-on cable fixing clips 91 play a position holding role for the cables entering and exiting the insulating box 1, so that the connection state of the cables at the main disconnect switch 2, horizontal conductive busbar 5, branch disconnect switch 11 and protective grounding conductor 6 remains stable, thereby reducing the impact of cable swing on the connection.

[0037] Furthermore, such as Figure 1 As shown, an ear-type mounting structure 10 is provided on the outside of the insulating enclosure 1. The ear-type mounting structure 10 is used to install the insulating enclosure 1 on the external support surface. The ear-type mounting structure 10 and the insulating enclosure 1 form the external mounting connection part of the whole enclosure. During assembly, the insulating enclosure 1 is first fixed to the external support surface by the ear-type mounting structure 10. Then, the main disconnect switch 2, insulating support plate 4, horizontal conductive busbar 5, protective grounding conductor 6, mounting rail 7, multiple branch disconnect switches 11, cable fixing frame 9 and multiple snap-on cable fixing clips 91 are installed and wired in sequence inside the insulating enclosure 1. During operation, the ear-type mounting structure 10 continuously bears the overall weight of the insulating enclosure 1 and its internal components, so that the external single power supply connected to the inlet interface 3 and the multiple charging pile cables output by the multiple branch disconnect switches 11 can work stably in the fixed installation state, thereby facilitating the arrangement of the whole enclosure on the external support surface.

[0038] Example 2 like Figure 7 As shown, based on the same inventive concept as the above embodiments, the present invention also provides a branch power supply method for an AC charging pile extension box, comprising: S10: Obtain the incoming line access information of an external single power supply.

[0039] Specifically, the incoming line access status is identified based on the connection status of the external single power supply and the incoming line interface. The incoming line interface consists of the incoming end of the main disconnect switch. The incoming line access information is used to at least indicate whether the external single power supply has been connected to the main disconnect switch, whether the current connection position corresponds to the incoming side of the main disconnect switch, and whether the prerequisite for subsequent power distribution within the box is met. After obtaining the incoming line access information, the incoming line access information is used as the input basis for controlling the main disconnect switch to turn on and establishing the power distribution relationship, so that the establishment of the subsequent power supply path is based on the fact that the external single power supply has been effectively connected.

[0040] S20: Control the main disconnect switch to be turned on according to the incoming line access information, and establish a power supply distribution relationship consisting of phase busbars and neutral busbars.

[0041] Specifically, when the incoming line access information indicates that the external single power supply has been successfully connected, the main disconnect switch is switched from the open state to the closed state. This allows the external single power supply that enters the main disconnect switch through the incoming line interface to be led out from the outgoing side of the main disconnect switch and transmitted to the phase busbar within the insulation box. At the same time, the neutral busbar is used as the neutral distribution path to establish the corresponding power supply connection relationship between the main disconnect switch, the phase busbar, and the neutral busbar. This results in the main power supply distribution relationship extending from the main input terminal to the busbar distribution terminal. The power supply distribution relationship is used to characterize the distribution status of the external single power supply entering the phase busbar and the neutral busbar respectively after passing through the main disconnect switch, and serves as the basis for configuring the connection status of multiple branch disconnect switches in the future.

[0042] S30: Configure the connection status of multiple branch disconnect switches with the corresponding phase busbars and / or neutral busbars according to the power supply distribution relationship, so as to obtain multiple branch power supply paths corresponding to the charging pile cables.

[0043] Specifically, based on the power supply distribution relationship, the connection relationship between multiple branch disconnect switches and their corresponding phase busbars and / or neutral busbars is determined, so that the incoming side of each branch disconnect switch matches the power take-off position of its corresponding busbar, and the outgoing side of each branch disconnect switch corresponds to a charging pile cable, thereby forming multiple distinct branch power supply paths. Each branch power supply path is used to characterize the power supply path from the main disconnect switch, which is distributed through the phase busbars and / or neutral busbars, and then output to the corresponding charging pile cable through the corresponding branch disconnect switch, so that multiple charging pile cables form a multi-parallel and separately controllable branch power supply relationship within the same insulating box.

[0044] S40: Based on the connection status of each branch power supply path and the grounding connection status of the protective grounding conductor, output electrical energy to the corresponding charging pile cable.

[0045] Specifically, based on the established power supply paths of each branch, and considering the grounding connection status between the protective grounding conductor and the protective grounding wire of each charging pile cable, power is output to the corresponding charging pile cable. This ensures that the power supply path of each branch disconnecting switch is in the connected state, continuously transmitting power to the corresponding charging pile cable. At the same time, the protective grounding wire of the charging pile cable is grounded to the protective grounding conductor. This forms a one-to-one power supply output relationship and protective grounding relationship with each charging pile cable, allowing the external single power supply to complete the entire process from total input, busbar distribution, branch connection to the output of the corresponding charging pile cable within the insulating box.

[0046] In the description of this specification, references to terms such as "an embodiment," "example," "specific 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 the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. An alternating current charging post extension branch box, characterized in that, It includes an insulating enclosure (1), a main disconnect switch (2) installed inside the insulating enclosure (1), an incoming line interface (3), an insulating support plate (4), a horizontal conductive busbar (5), a protective grounding conductor (6), a mounting rail (7), and multiple branch disconnect switches (11); The incoming terminal of the main disconnect switch (2) forms an incoming interface (3), which is used to connect an external single power supply. The mounting rail (7) is installed inside the insulating box (1), and the main disconnect switch (2), the insulating support plate (4) and the multiple branch disconnect switches (11) are respectively connected to the mounting rail (7); The insulating support plate (4) is vertically arranged inside the insulating box (1). The horizontal conductive busbar (5) is fixed on the insulating support plate (4), and multiple horizontal conductive busbars (5) are arranged parallel to each other. The horizontal conductive busbar (5) includes a phase busbar (51) and a neutral busbar (52). The phase busbar (51) is electrically connected to the outgoing terminal of the main disconnect switch (2). Multiple branch disconnect switches (11) are arranged side by side below the horizontal conductive busbar (5). The incoming terminal of each branch disconnect switch (11) is electrically connected to the corresponding phase busbar (51) and / or the neutral busbar (52). The outgoing terminal of each branch disconnect switch (11) is used to connect to the corresponding charging pile cable. The protective grounding conductor (6) is installed inside the insulating box (1) and connected to the protective grounding wire of each charging pile cable.

2. The alternating current charging post extension branch box of claim 1, wherein, The mounting rail (7) includes multiple mounting rails (7) spaced apart in the horizontal direction. The main disconnect switch (2), the insulating support plate (4) and the multiple branch disconnect switches (11) are respectively connected to the corresponding mounting rails (7).

3. The AC charging post extension branch box of claim 1, wherein, The horizontal conductive busbar (5) includes three phase busbars (51) and one neutral busbar (52). The three phase busbars (51) and the neutral busbar (52) are arranged at intervals in the vertical direction and fixed on the insulating support plate (4). The three phase busbars (51) and the neutral busbar (52) are arranged parallel to each other.

4. The alternating current charging post extension branch box of claim 1, wherein, Multiple branch disconnect switches (11) are arranged side by side at intervals along the length of the horizontal conductive busbar (5), and each branch disconnect switch (11) is located below the horizontal conductive busbar (5).

5. The alternating current charging post extension branch box of claim 1, wherein, Each of the branch disconnect switches (11) is a single-pole disconnect switch or a two-pole disconnect switch.

6. The alternating current charging post extension junction box of claim 1, wherein, The protective grounding conductor (6) is provided with a high current crimping terminal (81) and a plurality of low current crimping terminals (82). The high current crimping terminal (81) is used to connect the main grounding wire, and the plurality of low current crimping terminals (82) are used to connect the protective grounding wires of each charging pile cable.

7. The alternating current charging post extension branch box of claim 6, wherein, The protective grounding conductor (6) is located below the insulating support plate (4). The high current crimping terminal (81) and a plurality of the low current crimping terminals (82) are disposed on the protective grounding conductor (6). The plurality of low current crimping terminals (82) are spaced apart along the length direction of the protective grounding conductor (6).

8. The alternating current charging post expansion branch box of claim 1, wherein, The insulating box (1) is provided with a cable fixing frame (9), and the cable fixing frame (9) is provided with a plurality of snap-on cable fixing clips (91). The plurality of snap-on cable fixing clips (91) are used to fix the cables entering and leaving the insulating box (1).

9. The alternating current charging post expansion branch box of claim 1, wherein, The outer side of the insulating box (1) is provided with a hanging ear type mounting structure (10), which is used to install the insulating box (1) on the external support surface.

10. A method of branch power supply based on the AC charging pile extension box of any one of claims 1-9, characterized in that, The method includes: Obtain the incoming line connection information of an external single power supply; The main disconnect switch is turned on according to the incoming line access information, and a power supply distribution relationship consisting of phase busbars and neutral busbars is established. Based on the power supply distribution relationship, configure the connection status of multiple branch disconnect switches with the corresponding phase busbars and / or neutral busbars to obtain multiple branch power supply paths corresponding to the charging pile cables; Based on the connectivity of each branch power supply path and the grounding connection of the protective grounding conductor, power is output to the corresponding charging pile cable.

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