Convergence box and unmanned aerial vehicle

Abstract

The utility model relates to the technical field of unmanned aerial vehicles, in particular to a confluence box and an unmanned aerial vehicle, the confluence box provided by the embodiment of the utility model comprises a shell, a heavy current confluence board, a pre-charging circuit and a control circuit, the heavy current confluence board is arranged in the shell, and the heavy current confluence board is provided with an input terminal and an output terminal; the input terminal is electrically connected with a power supply loop; the pre-charging circuit is arranged in the shell and used for being connected with a power supply loop in parallel, and the pre-charging circuit is electrically connected with the strong current bus board; the control circuit is arranged in the shell, electrically connected with the pre-charging circuit and used for controlling on-off of the pre-charging circuit according to signals of external equipment, and the confluence box provided by the embodiment of the utility model is simple in structure and can effectively solve the problem of large current impact when the unmanned aerial vehicle is started.

Description

Technical Field

[0001] This utility model relates to the field of unmanned aerial vehicle (UAV) technology, and in particular to a junction box and a UAV. Background Technology

[0002] With the rapid development of drone technology, its application areas are constantly expanding, ranging from military reconnaissance and agricultural plant protection to emergency rescue and logistics transportation. The power system of a drone typically includes components such as batteries, motor controllers, and motors. The electrical connections and power supply management between these components are one of the key factors ensuring the safe and reliable operation of the drone.

[0003] Currently, common drone power supply systems typically connect batteries directly to the power system. During operation, when the battery is connected to the power system via a main relay, a large instantaneous charging current is generated because the capacitors in the power system are in a discharging state. This large instantaneous current not only causes electrical damage to the contacts of the main relay, shortening its lifespan, but may also trigger the overcurrent protection of the battery protection board, affecting the normal start-up of the drone. Simultaneously, the current surge can also adversely affect downstream equipment such as the motor controller, reducing system reliability.

[0004] Some solutions have been proposed in related technologies, such as using soft-start circuits or adding buffer capacitors. However, these solutions are either structurally complex, increasing system cost and potential failure points; or bulky, hindering the compact design of the overall UAV structure; or lack sufficient reliability, making it difficult to meet the working requirements of UAVs in complex environments. Utility Model Content

[0005] This utility model provides a junction box and a drone. The junction box has a simple structure and can effectively solve the problem of high current surge when the drone starts up.

[0006] In a first aspect, this utility model provides a combiner box, comprising: a housing; a high-voltage combiner board disposed within the housing, the high-voltage combiner board having an input terminal and an output terminal, the input terminal being used for electrical connection with a power supply circuit; a pre-charging circuit disposed within the housing, used for parallel connection with the power supply circuit, the pre-charging circuit being electrically connected to the high-voltage combiner board; and a control circuit disposed within the housing, electrically connected to the pre-charging circuit, used for controlling the on / off state of the pre-charging circuit according to signals from external devices.

[0007] In one possible implementation, the pre-charge circuit is connected in parallel with the battery's main relay.

[0008] In one possible implementation, the pre-charge circuit includes a pre-charge relay and a current-limiting resistor connected in series.

[0009] In one possible implementation, the control circuit includes: a low-voltage control board; and a communication terminal electrically connected to the low-voltage control board for receiving signals from external devices.

[0010] In one possible implementation, the input terminals include a positive terminal and a negative terminal; the output terminals include multiple pluggable terminals.

[0011] In one possible implementation, the housing has mounting steps, and the high-voltage busbar is fixed to the mounting steps.

[0012] In one possible implementation, a top cover is also included, with a wiring hole between the top cover and the housing, and a sealing material is provided inside the wiring hole.

[0013] Secondly, this utility model embodiment also provides a drone, including: a power system; a battery having a main relay; and the aforementioned combiner box, the input terminal of which is electrically connected to the battery, and the output terminal of which is electrically connected to the power system.

[0014] In one possible implementation, the control circuit detects the voltage of the power system, and when the voltage reaches a preset value, it controls the pre-charging circuit to disconnect.

[0015] In one possible implementation, the main relay of the battery is in the opposite state to the on / off state of the pre-charge circuit.

[0016] The combiner box provided by this utility model adopts a design scheme with a built-in high-voltage combiner board, a pre-charging circuit and a power supply circuit connected in parallel, and an intelligent control system. This effectively solves the technical problem of large current surges that easily occur during drone startup in existing technologies. By setting up the pre-charging circuit, the power system is pre-charged first during system startup, avoiding the instantaneous large current generated when directly connecting the main circuit in traditional solutions. This protects the main relay contacts from electrical damage, prevents the battery protection board from falsely triggering overcurrent protection, and also provides effective protection for downstream equipment such as motor controllers. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a three-dimensional structural diagram of a junction box provided by this utility model.

[0019] Figure 2 This is a schematic diagram of the structure of a junction box after removing the top cover, as provided by this utility model.

[0020] Figure 3 This is a schematic diagram of the structure of a high-voltage busbar, a pre-charging circuit, and a control circuit provided by this utility model.

[0021] Figure 4 This is a structural schematic diagram of a shell provided by this utility model.

[0022] Figure 5 This utility model provides a circuit control diagram.

[0023] Figure label:

[0024] 1. Housing; 11. Mounting step; 12. Wiring hole; 13. Terminal hole;

[0025] 2. High-voltage busbar; 21. Positive terminal; 22. Negative terminal; 23. Pluggable terminal;

[0026] 3. Pre-charge circuit; 31. Pre-charge relay; 32. Current limiting resistor;

[0027] 4. Control circuit; 41. Low-voltage control board; 42. Communication terminals;

[0028] 5. Battery; 51. Main relay;

[0029] 6. Top cover;

[0030] 7. Power system. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0032] The following is combined Figures 1-5 This utility model provides a combiner box, comprising: a housing 1, a high-voltage combiner board 2, a pre-charging circuit 3, and a control circuit 4, wherein:

[0033] The high-voltage busbar 2 is housed within the housing 1. The high-voltage busbar 2 has input terminals and output terminals. The input terminals are used for electrical connection to the power supply circuit. Specifically, the input terminals of the high-voltage busbar 2 are connected to the power supply circuit, and the output terminals are used for electrical connection to external devices, thereby connecting the power supply circuit to the external devices for power supply.

[0034] The pre-charging circuit 3 is located inside the housing 1 and is used to connect in parallel with the power supply circuit. The pre-charging circuit 3 is electrically connected to the high-voltage busbar 2.

[0035] The control circuit 4 is located inside the housing 1 and is electrically connected to the pre-charging circuit 3. It is used to control the on / off state of the pre-charging circuit 3 according to the signal from the external device.

[0036] In this invention, the combiner box adopts a design scheme in which a high-voltage combiner board 2 is built into the housing 1, a pre-charging circuit 3 is connected in parallel with the power supply circuit, and an intelligent control system is implemented. This effectively solves the technical problem of large current surges that easily occur when drones start up in the prior art. By setting up the pre-charging circuit 3, the power system 7 is pre-charged first when the system starts up, avoiding the instantaneous large current generated when directly connecting the main circuit in the traditional scheme. This protects the contacts of the main relay 51 from electrical damage, prevents the battery 5 protection board from falsely triggering the overcurrent protection, and also provides effective protection for downstream equipment such as the motor controller.

[0037] Specifically, the parallel design of the pre-charging circuit 3 and the power supply circuit provides effective pre-charging protection for the UAV power system 7. For example, during the UAV takeoff phase, the simultaneous starting of multiple motors generates a large instantaneous current. At this time, the pre-charging circuit 3, through its current-limiting function, can control the starting current within a safe range, significantly reducing the impact of the starting shock on the system. This protection is of great significance for extending the service life of key components such as motors and batteries 5. The control circuit 4 intelligently controls the on / off state of the pre-charging circuit 3 based on external device signals, requiring no manual intervention and greatly improving the system's automation level and reliability. During actual flight, the control circuit 4 can automatically adjust the operating state of the pre-charging circuit 3 according to factors such as flight status and load changes, ensuring that the system is always in optimal operating condition. The overall modular design concept makes maintenance more convenient. If a module malfunctions, maintenance personnel can quickly locate and replace the corresponding component, effectively reducing the UAV's downtime for maintenance. This modular design also facilitates product upgrades and improvements, allowing for flexible adjustments to the configuration of each module according to market demands.

[0038] The housing 1 is made of die-cast aluminum alloy with an anodized surface, providing excellent mechanical strength and heat dissipation performance. The surface of housing 1 is designed with heat dissipation fins to increase heat dissipation area and improve efficiency. Housing 1 has an IP67 protection rating, effectively preventing dust and water intrusion and adapting to various harsh environments.

[0039] The high-voltage busbar 2 is housed within the casing 1 and employs a multi-layer PCB design, with separate power and signal layers to effectively reduce electromagnetic interference. The surface of the high-voltage busbar 2 is covered with an insulating coating, enhancing safety. The high-voltage busbar 2 includes input terminals and output terminals. The input terminals are used for electrical connection to the power supply circuit; in this embodiment, the power supply circuit is the UAV's battery system 5. For ease of fault detection, test points are provided on the high-voltage busbar 2, allowing maintenance personnel to conveniently measure electrical parameters.

[0040] The pre-charge circuit 3 is also located within the housing 1, connected in parallel with the power supply circuit, and electrically connected to the high-voltage busbar 2. The pre-charge circuit 3 includes a pre-charge relay 31 and a current-limiting resistor 32 connected in series. The pre-charge relay 31 adopts a normally open contact design, with the following technical parameters: rated current 100A, coil voltage 12V, and response time: closing time not exceeding 10ms and opening time not exceeding 5ms, exhibiting high switching speed. The mechanical life of the pre-charge relay 31 is no less than 1 million cycles, and its electrical life is no less than 100,000 cycles, meeting the requirements for frequent starts.

[0041] In some embodiments, the pre-charging circuit 3 is used in parallel with the main relay 51 of the battery 5.

[0042] This embodiment of the invention further defines the parallel connection between the pre-charging circuit 3 and the main relay 51 of the battery 5. This design enables the pre-charging circuit 3 and the main relay 51 to form a complementary working mode. In practical applications, when the UAV needs to start, the pre-charging circuit 3 is turned on first, pre-charging the power system 7 through the current-limiting resistor 32. After the voltage balances, the main relay 51 is turned on and the pre-charging circuit 3 is turned off, achieving a smooth transition during power switching. This working mode not only reduces voltage fluctuations during power switching, but is also particularly important when the UAV is performing precision tasks. For example, during aerial surveying, the stability of the power supply directly affects image quality; during precision instrument carrying tasks, power fluctuations may cause instrument data distortion. The design of the pre-charging circuit 3 effectively solves these problems. At the same time, this design also significantly extends the service life of the main relay 51. Through the buffering effect of the pre-charging circuit 3, the direct switching of the main relay 51 under high current conditions is avoided, effectively reducing electrical wear of the contacts and improving the overall service life of the equipment. During long-term use, this protective function can significantly reduce the replacement frequency of the main relay 51, reducing maintenance costs.

[0043] In some embodiments, the pre-charge circuit 3 includes a pre-charge relay 31 and a current-limiting resistor 32 connected in series.

[0044] This embodiment of the invention specifically defines the pre-charging circuit 3 as employing a pre-charging relay 31 and a current-limiting resistor 32 connected in series. This simple and reliable design demonstrates unique advantages in practical applications. Compared to complex electronic current-limiting circuits, this solution offers better reliability and heat dissipation performance.

[0045] Specifically, for example, when operating in high-temperature environments for extended periods, electronic components are susceptible to performance degradation due to temperature variations, while the current-limiting resistor 32 offers better temperature adaptability. By limiting the charging current within a safe range using the current-limiting resistor 32, downstream devices can be effectively protected from impacts.

[0046] In practical applications, this protection is particularly important when the drone needs to start and stop frequently (such as in multi-point sampling missions). The pre-charge relay 31 can switch its operating mode in a timely manner according to the system status. When it detects that the voltage of the power system 7 has reached a preset value, it quickly disconnects, preventing the current-limiting resistor 32 from overheating due to carrying a large current for a long time. This automatic switching function not only improves system efficiency but also reduces energy loss.

[0047] The current-limiting resistor 32 is a high-power 100Ω / 50W resistor with heat dissipation fins on its surface, which can effectively dissipate the heat generated during operation. The resistance value of the current-limiting resistor 32 is selected with consideration of the system operating voltage and the maximum allowable charging current, which can limit the charging current at startup to a safe range. This simple and reliable structural design not only ensures the realization of the pre-charging function, but also reduces the possibility of failure.

[0048] In some embodiments, the control circuit 4 includes: a low-voltage control board 41; and a communication terminal 42, electrically connected to the low-voltage control board 41, for receiving signals from external devices.

[0049] This embodiment of the invention refines the structure of the control circuit 4, including two key components: a low-voltage control board 41 and a communication terminal 42. This design achieves separation of control and power, exhibiting good anti-interference performance in practical applications.

[0050] Specifically, when the drone operates near high-voltage lines or in environments with strong electromagnetic interference, the control signal is not affected by the large current, ensuring the stability of the system. Communication terminal 42 enables real-time data interaction with external devices, allowing for real-time monitoring of the power system 7's operating status and providing a data foundation for intelligent system control.

[0051] In practical applications, this data interaction function can support advanced features such as fault prediction and performance optimization, improving the system's intelligence level. For example, by analyzing historical operating data, the maintenance cycle of components can be predicted, enabling preventative maintenance.

[0052] The control circuit 4 includes a low-voltage control board 41 and a communication terminal 42. The low-voltage control board 41 employs a 12-bit microcontroller design, featuring abundant peripheral interfaces and powerful data processing capabilities. The control circuit 4 not only implements basic pre-charge control functions but also includes functions such as fault diagnosis, data logging, and temperature protection. The communication terminal 42 is electrically connected to the low-voltage control board 41, using a standard CAN interface for easy communication with the UAV's flight control system. The communication terminal 42 supports multiple communication protocols and has good expandability. Terminal holes 13 are provided on the housing 1, through which the communication terminal 42 is installed.

[0053] The input terminals include a positive terminal 21 and a negative terminal 22 for connection to the positive and negative terminals of the battery 5. The output terminals include multiple pluggable terminals 23, each with a positive and a negative connector. In this embodiment, six sets of output terminals are provided, which can simultaneously power a power unit, specifically, a motor on a drone. The pluggable design facilitates quick connection and replacement of the various units of the power system 7, improving maintenance efficiency.

[0054] In some embodiments, the input terminal includes a positive terminal 21 and a negative terminal 22; the output terminal includes a plurality of pluggable terminals 23, each pluggable terminal 23 including a male plug and a female plug that are mated together, one of the male plug or the female plug being fixed to the housing, and the other being used to connect to the power unit of the power system.

[0055] In this embodiment of the invention, the design of the positive terminal 21 and the negative terminal 22 ensures the reliability of the electrical connection, while the design of multiple pluggable terminals 23 provides greater flexibility. In practical applications, when multiple power units need to be powered, an appropriate number of output terminals can be selected for connection as needed. This modular design concept not only facilitates on-site installation and commissioning but also reserves space for system expansion. For example, when performing different load tasks, the number of power supply units can be flexibly configured as needed. The pluggable design also facilitates troubleshooting and maintenance; when a problem occurs in an output circuit, it can be quickly replaced or reconfigured.

[0056] Specifically, by installing the high-voltage busbar 2 inside the housing 1, the safety hazards that may be caused by traditional exposed copper busbars are avoided. In practical applications, when the drone operates under complex weather conditions, there is no risk of exposed live wires even if there is severe shaking. Especially when performing tasks such as agricultural plant protection and emergency rescue, severe weather such as heavy rain and strong winds are frequently encountered, making the enclosed high-voltage busbar 2 design particularly important.

[0057] In some embodiments, the housing 1 has a mounting step 11, and the high-voltage busbar 2 is fixed on the mounting step 11.

[0058] In this invention, the mounting steps 11 on the housing 1 provide a stable mounting base for the high-voltage busbar 2, ensuring the stability of the components under severe vibration. This design is particularly important during high-speed flight or rapid turns, as it prevents components from loosening or shifting.

[0059] The housing 1 has a mounting step 11, and the high-voltage busbar 2 is fixed to the mounting step 11 by bolts. The mounting bolts are designed to prevent loosening, so they can remain stable even under severe vibration. The design of the mounting step 11 not only provides a stable mounting base, but also facilitates the control of the precision of the installation process.

[0060] In some embodiments, the system further includes an upper cover 6, which has a wiring hole 12 between the upper cover 6 and the housing 1, and the wiring hole 12 is provided with a sealing material.

[0061] In this invention, the wiring hole 12 between the top cover 6 and the housing 1 is filled with a sealing material, effectively preventing the intrusion of external environmental factors such as dust and moisture. These design details are particularly important in practical applications. For example, they prevent salt spray corrosion when operating in marine environments; they block sand and dust intrusion when working in desert areas; and they keep the interior dry during rainy or snowy weather. This comprehensive protective design greatly improves the environmental adaptability and reliability of the equipment.

[0062] Specifically, the wiring hole 12 is equipped with a sealing material made of high-temperature resistant silicone. The sealing structure adopts a labyrinth design, which improves the reliability of the seal. A waterproof ring is also provided at the connection between the housing 1 and the top cover 6 to ensure overall sealing. In order to balance the internal and external pressure, a one-way vent valve is also provided on the housing 1 to prevent the pressure difference from affecting the sealing performance.

[0063] This utility model embodiment also provides a drone, including: a power system 7; a battery 5, the battery 5 having a main relay 51; and the aforementioned combiner box, the input terminal of the combiner box being electrically connected to the battery 5, and the output terminal being electrically connected to the power system 7.

[0064] In this invention, by integrating the combiner box into the drone's power system 7, safe power supply from the battery 5 to the power system 7 is achieved. This integrated design not only improves the system's reliability but also simplifies the overall wiring structure and reduces the overall weight of the drone.

[0065] The power system 7 includes multiple motors and motor controllers. Each motor controller is independently powered through a set of output terminals, achieving modular power supply management. This design ensures that a failure in a single power unit will not affect the normal operation of other units, improving system reliability. The control circuit 4 monitors the voltage of the power system 7 in real time through the communication terminal 42. When the voltage reaches a preset value (e.g., 90% of the battery 5 voltage), the control circuit 4 controls the pre-charge circuit 330 to disconnect and simultaneously notifies the battery 5 management system to activate the main relay 51.

[0066] In practical applications, the weight reduction directly translates into increased flight time and payload capacity. For example, when performing long-distance inspection missions, more equipment can be carried or flight time can be extended. Simultaneously, the simplified wiring structure reduces potential points of failure, improving the overall reliability of the system.

[0067] In some embodiments, the control circuit 4 detects the voltage of the power system 7, and when the voltage reaches a preset value, controls the pre-charging circuit 3 to disconnect.

[0068] In this embodiment of the invention, the specific control strategy of the control circuit 4 is further defined. By real-time detection of the voltage of the power system 7, the pre-charging circuit 3 is automatically disconnected when a preset value is reached, achieving intelligent pre-charging control. This adaptive control method can automatically adjust the working state according to different operating conditions, improving the system's adaptability. For example, under different temperature conditions, the voltage characteristics of the battery 5 will change, and adaptive control can ensure that the system always operates in the optimal state. At the same time, this control method can also automatically adjust the pre-charging time according to load changes, ensuring both safety and improving efficiency.

[0069] In some embodiments, the main relay 51 of battery 5 has the opposite on / off state to the pre-charging circuit 3.

[0070] In this invention, during the drone startup process, the pre-charging circuit 3 is turned on while the main relay 51 is turned off. After pre-charging is complete, the pre-charging circuit 3 is turned off while the main relay 51 is turned on. This alternating working mode ensures the safety and reliability of power switching. Hardware logic ensures that the two circuits will not be turned on simultaneously, avoiding the risks that may arise from control failure. This design is particularly important in harsh environments, ensuring that even if the control system is interfered with, the dangerous situation of both circuits being turned on simultaneously will not occur.

[0071] The main relay 51 of battery 5 has the opposite on / off state to the pre-charge circuit 3; that is, when the pre-charge circuit 3 is on, the main relay 51 is off; when the pre-charge circuit 3 is off, the main relay 51 is on. This interlocking design effectively prevents both circuits from being on simultaneously, avoiding loop current. The control circuit 4 monitors the states of the two relays in real time to ensure that they always maintain an interlocking relationship.

[0072] In actual operation, when a drone needs to be started, the control process is as follows:

[0073] 1) First, control circuit 4 receives the start command;

[0074] 2) Control circuit 4 checks the system status and confirms that all parameters are normal;

[0075] 3) The control circuit 4 controls the pre-charge relay 31 in the pre-charge circuit 3 to close, while the main relay 51 remains open.

[0076] 4) The power system 7 is pre-charged through the current-limiting resistor 32;

[0077] 5) Control circuit 4 monitors the voltage and pre-charge current of power system 7 in real time;

[0078] 6) When the voltage reaches the preset value, the control circuit 4 controls the pre-charge relay 31 to disconnect;

[0079] 7) At the same time, the battery management system controls the main relay 51 to close, and normal power supply begins;

[0080] 8) Control circuit 4 continues to monitor the system status to ensure that the switching process is completed smoothly.

[0081] In the above control process, the pre-charging time of pre-charging circuit 3 is typically between 100ms and 500ms, with the specific time automatically adjusted based on the system capacity and the magnitude of the pre-charging current. Control circuit 4 dynamically adjusts the pre-charging time based on the real-time monitored voltage rise rate, ensuring sufficient charging while avoiding unnecessary waiting time. If an abnormality is detected during pre-charging, such as an abnormal voltage rise rate or excessive current, control circuit 4 will immediately interrupt the pre-charging process and issue a warning signal.

[0082] During daily use, control circuit 4 records key parameters for each pre-charge, including pre-charge time, voltage curve, and current value. This data can be exported via communication terminal 42 for system optimization and fault analysis. Simultaneously, control circuit 4 monitors the temperature of current-limiting resistor 32. When the temperature exceeds a set threshold, it extends the interval between two pre-charges to prevent overheating of current-limiting resistor 32.

[0083] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0084] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A busbar box characterized by, The application relates to a power supply box. The power supply box comprises a shell (1), a strong-current busbar (2) arranged in the shell (1), an input terminal of the strong-current busbar (2) being used for electrically connecting with a power supply circuit, a pre-charging circuit (3) arranged in the shell (1) and used for being connected in parallel with the power supply circuit, the pre-charging circuit (3) being electrically connected with the strong-current busbar (2), and a control circuit (4) arranged in the shell (1) and electrically connected with the pre-charging circuit (3) and used for controlling on-off of the pre-charging circuit (3) according to a signal of an external device. The pre-charging circuit (3) is used for being connected in parallel with a main relay (51) of a battery (5). The pre-charging circuit (3) comprises a pre-charging relay (31) and a current-limiting resistor (32) connected in series. The control circuit (4) comprises a weak-current control board (41) and a communication terminal (42) electrically connected with the weak-current control board (41) and used for receiving the signal of the external device.

2. The busbar box according to claim 1, characterized in that The input terminal comprises a positive terminal (21) and a negative terminal (22), and the output terminal comprises a plurality of pluggable terminals (23).

3. The busbar box according to claim 1, characterized in that The shell (1) has a mounting step (11), and the strong-current busbar (2) is fixed on the mounting step (11).

4. The busbar box of claim 1, wherein, The power supply box further comprises an upper cover (6), the upper cover (6) and the shell (1) have a wiring hole (12) therebetween, and sealing material is arranged in the wiring hole (12). The application further relates to a power supply box. The power supply box comprises a power system (7) and a battery (5) having a main relay (51).

5. The busbar box of claim 1, wherein, The input terminal of the power supply box is electrically connected with the battery (5), and the output terminal is electrically connected with the power system (7).

6. The busbar box according to any one of claims 1-5, characterized in that The control circuit (4) detects a voltage of the power system (7), and when the voltage reaches a preset value, the pre-charging circuit (3) is controlled to be turned off.

7. The busbar box according to claim 6, characterized in that The main relay (51) of the battery (5) is opposite to the on-off state of the pre-charging circuit (3).

8. A drone, characterized in that, ​ ​ ​ ​ 9. The drone of claim 8, wherein, ​ 10. The drone of claim 8 or 9, wherein, ​

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