Vehicle-mounted high-voltage distribution box and power distribution system

Abstract

The utility model discloses a vehicle-mounted high-voltage distribution box and power distribution system, wherein the vehicle-mounted high-voltage distribution box comprises a main positive power supply unit, a pre-charging unit, a battery pack interface, a controller interface, a motor control interface and an electronic control interface. The main positive power supply unit is connected with the battery pack interface and the motor control interface to supply power to the motor control module based on its own on-off control. The pre-charging unit is connected with the battery pack interface and the motor control interface to supply power to the motor control module based on its own on-off control. The main positive power supply unit and the pre-charging unit are connected with the electronic control interface to control the on or off based on the electronic control module. The vehicle-mounted high-voltage distribution box and power distribution system can effectively separate the motor control module and the power distribution controller for assisting other high-voltage components, thereby being able to adapt to most vehicle models and reducing the procurement difficulty and cost of the vehicle model project requiring a single machine.

Description

Technical Field

[0001] This utility model belongs to the field of new energy vehicle technology, specifically relating to a vehicle-mounted high-voltage junction box and power distribution system. Background Technology

[0002] The core electric vehicle components, especially the drive motor, high-voltage components, and on-board power supply, are all protected by a PDU (Power Distribution Unit) for high-voltage power distribution and safety protection.

[0003] like Figure 1 As shown, mainstream high-voltage power distribution units are typically integrated, encompassing not only high-voltage power distribution to the drive motor but also auxiliary components such as on-board chargers (OBC) and DC-DC converters. The main functions of common high-voltage power distribution units include:

[0004] ① Power Distribution: Distributes the high-voltage DC power output from the power battery to various high-voltage electrical devices such as the drive motor, air conditioning compressor, DC-DC converter, and on-board charger; ② Circuit Protection: Equipped with multiple protection functions such as overcurrent, overvoltage, and short circuit. When a circuit fault occurs, protective devices such as fuses and relays will quickly activate and disconnect the circuit; ③ Status Monitoring and Fault Diagnosis: Monitors parameters such as current, voltage, and temperature of the high-voltage circuit in real time and feeds them back to the vehicle's electronic control unit (ECU) or battery management system (BMS); When a fault occurs in the high-voltage system, it can prompt fault information through fault codes or indicator lights, facilitating rapid fault location and troubleshooting.

[0005] Currently, due to the design and development trends of high-voltage power distribution units, independent PDU hardware is rarely found on the market. Most PDUs require customization based on the vehicle's high-voltage topology and tend towards modularity and high integration. This makes it difficult for many vehicle projects with single-sample requirements to find suitable products, sometimes forcing them to spend significant sums developing new machines, resulting in high costs, lack of flexibility, and procurement difficulties.

[0006] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0007] The purpose of this utility model is to provide an on-board high-voltage junction box and power distribution system, which can realize separate power distribution for motor control module and power distribution controller, and can be applied to high-voltage topology architecture of various new energy vehicles.

[0008] To achieve the above objectives, the technical solution provided by a specific embodiment of this utility model is as follows:

[0009] A vehicle-mounted high-voltage junction box includes a box body, a main positive power supply unit, a pre-charging unit, a battery pack interface, a controller interface, a motor control interface, and an electronic control interface. The main positive power supply unit and the pre-charging unit are disposed inside the box body, while the battery pack interface, controller interface, motor control interface, and electronic control interface are mounted on the box body. The battery pack interface is used to connect to an external battery pack, and the controller interface is connected to the battery pack interface to connect to an external power distribution controller for power supply. The motor control interface is used to connect to an external motor control module. The main positive power supply unit is connected to the battery pack interface and the motor control interface to supply power to the motor control module based on its own on / off control. The pre-charging unit is connected to the battery pack interface and the motor control interface to supply power to the motor control module based on its own on / off control. The electronic control interface is used to connect to an external electronic control module, and the main positive power supply unit and the pre-charging unit are connected to the electronic control interface to enable or disable the electronic control module based on its control.

[0010] In one or more embodiments of this utility model, the main positive power supply unit includes a main positive relay, the first end of the switch of the main positive relay is connected to the battery pack interface, the second end of the switch of the main positive relay is connected to the motor control interface, and the two ends of the coil of the main positive relay are connected to the electronic control interface.

[0011] In one or more embodiments of this utility model, the pre-charging unit includes a pre-charging relay, a pre-charging fuse, and a pre-charging resistor. The switch of the pre-charging relay, the pre-charging fuse, and the pre-charging resistor are connected in series between the battery pack interface and the motor control interface. The two ends of the coil of the pre-charging relay are connected to the electronic control interface.

[0012] In one or more embodiments of this utility model, the vehicle-mounted high-voltage junction box further includes a main positive fuse disposed inside the box. The first end of the main positive fuse is connected to the motor control interface, and the second end of the main positive fuse is connected to the main positive power supply unit and the pre-charging unit.

[0013] In one or more embodiments of this utility model, the vehicle-mounted high-voltage junction box further includes mounting feet, which are mounted on the outside of the box body and electrically contact the box body. The mounting feet are used for fixed installation with the vehicle frame and are electrically contacted with the vehicle frame; and / or the vehicle-mounted high-voltage junction box further includes a grounding terminal, which is fixedly installed on the box body and electrically contacted with the box body.

[0014] In one or more embodiments of the present invention, the outer surface of the box is at least partially covered with an insulating layer and / or the inner surface of the box is at least partially covered with an insulating layer.

[0015] In one or more embodiments of this utility model, the box body includes a fixedly installed bottom box and a top cover, and a sealing ring is provided between the bottom box and the top cover.

[0016] In one or more embodiments of this utility model, the vehicle-mounted high-voltage junction box further includes a copper busbar assembly disposed within the box body. The copper busbar assembly is used for the connection between the battery pack interface and the controller interface, as well as the connection between the main positive power supply unit and the pre-charging unit and the battery pack interface.

[0017] In one or more embodiments of this utility model, the vehicle-mounted high-voltage junction box further includes an insulating column, and the copper busbar assembly is fixedly installed to the box body through the insulating column.

[0018] A specific embodiment of this utility model also provides a power distribution system, including a power distribution controller and the aforementioned vehicle-mounted high-voltage junction box, wherein the controller interface is connected to the power distribution controller.

[0019] Compared with existing technologies, the vehicle-mounted high-voltage junction box and power distribution system of this utility model can effectively separate the motor control module and the power distribution controller for other high-voltage components, thus adapting to most vehicle models. This reduces the procurement difficulty and cost of high-voltage power distribution modules for vehicle models with single-sample requirements. At the same time, it eliminates the need to find suppliers to modify molds, and features a simple structure, fast cycle, and low cost. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of 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 only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of a high-voltage power distribution system in the existing technology.

[0022] Figure 2 This is a structural diagram of the vehicle-mounted high-voltage junction box in one embodiment of the present invention.

[0023] Figure 3 This is a circuit diagram of the vehicle-mounted high-voltage junction box in one embodiment of the present invention. Detailed Implementation

[0024] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of the embodiments 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, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0025] The terms "coupled," "connected," or "linked" in this specification include both direct and indirect connections. Indirect connections are those made through an intermediate medium, such as those made through an electrically conductive medium, which may have parasitic inductance or capacitance. Indirect connections may also include connections made through other active or passive devices to achieve the same or similar functional purpose, such as connections through switches, follower circuits, or other circuits or components. Furthermore, in this specification, terms such as "first" and "second" are primarily used to distinguish one technical feature from another, and do not necessarily require or imply any actual relationship, quantity, or order between these technical features.

[0026] In the detailed description of this specification, reference is made to the accompanying drawings, which form a part thereof, wherein like reference numerals always denote like parts, and wherein exemplary embodiments are shown by way of example that may be implemented. It should be understood that other embodiments may be utilized, and structural or logical changes may be made, without departing from the scope of this application. Therefore, the following detailed description should not be considered limiting.

[0027] The various operations in the specification may be described sequentially as multiple discrete actions or operations in a manner most conducive to understanding the claimed subject matter. However, the order of description should not be construed as implying that these operations must be sequentially related. Specifically, these operations may not be performed in the order presented. The described operations may be performed in a different order than in the described embodiments. Various additional operations may be performed in additional embodiments and / or the described operations may be omitted.

[0028] For the purposes of this application, the phrase "A and / or B" means (A), (B), or (A and B). For the purposes of this application, the phrase "A, B and / or C" means (A), (B), (C), (A and B), (A and C), (B and C), or (A, B and C).

[0029] Various components and devices may be mentioned or shown in the singular form herein, but only for the convenience of discussion, and any element mentioned in the singular form may include multiple such elements as taught herein.

[0030] The description uses the phrases "in one embodiment," "in other embodiments," or "in some embodiments," each of which may refer to one or more of the same or different embodiments. Furthermore, the terms "comprising," "including," "having," etc., used in relation to embodiments of this application are synonymous.

[0031] like Figure 2 As shown, in one embodiment of this utility model, the vehicle-mounted high-voltage junction box includes a box body 10, a main positive power supply unit 20, a main positive fuse 30, a pre-charging unit 40, a battery pack interface 51, a controller interface 52, a motor control interface 53, an electronic control interface 54, mounting feet 60, a grounding terminal 70, a copper busbar assembly, and insulating posts. The main positive power supply unit 20, the main positive fuse 30, the pre-charging unit 40, the copper busbar assembly, and the insulating posts are disposed inside the box body 10, while the battery pack interface 51, the controller interface 52, the motor control interface 53, and the electronic control interface 54 are mounted on the box body 10.

[0032] like Figure 3 As shown, the battery pack interface 51 is used to connect to an external battery pack, and the controller interface 52 is connected to the battery pack interface 51. The controller interface 52 is used to connect to an external power distribution controller to supply power to the power distribution controller. Specifically, the positive terminal B+ of the battery pack interface is connected to the positive terminal of the battery pack, and the negative terminal B- of the battery pack interface is connected to the negative terminal of the battery pack. The positive terminal Xin1+ of the controller interface is connected to the positive terminal B+ of the battery pack interface, and the negative terminal Xin1- of the controller interface is connected to the negative terminal B- of the battery pack interface.

[0033] In one embodiment, the power distribution controller can be an auxiliary PDU that integrates the power distribution functions of various high-voltage electrical equipment such as on-board chargers, DC-DC converters, and air conditioning compressors, but does not directly distribute power to the motor control module.

[0034] In other embodiments, the power distribution controller can also be the assembly PDU of the new energy vehicle. The assembly PDU can be an existing vehicle unit, which usually integrates the power distribution functions of various high-voltage electrical equipment, including the motor control module. It should be noted that when using the assembly PDU, the assembly PDU is not connected to the motor controller or does not perform power distribution control on the motor controller. The power distribution control of the motor controller is achieved by the on-board high-voltage junction box in this solution.

[0035] like Figure 3 As shown, the motor control interface 53 is used to connect to an external motor control unit (MCU). Specifically, the positive terminal MCU+ of the motor control interface is connected to the positive power supply terminal of the motor control module, and the negative terminal MCU- of the motor control interface is connected to the negative power supply terminal of the motor control module. The negative terminal MCU- of the motor control interface is also connected to the negative terminal B- of the battery pack interface.

[0036] The first end of the main positive fuse 30 is connected to the positive MCU+ of the motor control interface, and the second end of the main positive fuse 30 is connected to the main positive power supply unit 20 and the pre-charge unit 40.

[0037] The main positive power supply unit 20 is connected to the positive terminal B+ of the battery pack interface to supply power to the motor control module based on its own on / off control. The pre-charge unit 40 is connected to the positive terminal B+ of the battery pack interface to supply power to the motor control module based on its own on / off control.

[0038] The electronic control interface 54 is used to connect an external electronic control module. The main positive power supply unit 20 and the pre-charge unit 40 are connected to the electronic control interface 54 to turn on or off based on the control of the electronic control module.

[0039] In one embodiment, the electronic control module is the vehicle control unit (VCU) of the new energy vehicle. In other embodiments, the electronic control module may also be other control modules of the vehicle.

[0040] In other embodiments, the main positive fuse 30 may be omitted, in which case the main positive power supply unit 20 and the pre-charge unit 40 are directly connected to the positive MCU+ of the motor control interface.

[0041] Preferably, the battery pack interface 51, controller interface 52, motor control interface 53, and the explosion-proof gland are automotive-grade, and their model can be: JAR-L-REMC-HTR-M25-18-XA. The controller interface 52 can also be selected according to the actual power distribution controller requirements, and the motor control interface 53 can also be selected according to the actual motor control module requirements.

[0042] Preferably, the electronic control interface 54 is an Amphenol automotive-grade connector, model number AT04-4PA-PM11.

[0043] like Figure 3 As shown, the main positive power supply unit 20 may include a main positive relay 21. The first terminal of the main positive relay 21 is connected to the positive B+ of the battery pack interface, the second terminal of the main positive relay 21 is connected to the second terminal of the main positive fuse 30, and the two ends of the coil of the main positive relay 21 are connected to the electronic control interface 54.

[0044] like Figure 3 As shown, the pre-charge unit 40 includes a pre-charge relay 42, a pre-charge fuse 43, and a pre-charge resistor 41. The switch of the pre-charge relay 42, the pre-charge fuse 43, and the pre-charge resistor 41 are connected in series between the positive terminal B+ of the battery pack interface and the second terminal of the main positive fuse 30. The two ends of the coil of the pre-charge relay 42 are connected to the electronic control interface 54.

[0045] In one embodiment, the first end of the pre-charge resistor 41 is connected to the positive terminal B+ of the battery pack interface, the second end of the pre-charge resistor 41 is connected to the first end of the switch of the pre-charge relay 42, the second end of the switch of the pre-charge relay 42 is connected to the first end of the pre-charge fuse 43, and the second end of the pre-charge fuse 43 is connected to the second end of the main positive fuse 30.

[0046] In one embodiment, the main positive control terminal K1+ of the electronic control interface is connected to the corresponding terminal of the electronic control module to receive control signals for controlling the main positive relay 21. The precharge control terminal K2+ of the electronic control interface is connected to the corresponding terminal of the electronic control module to receive control signals for controlling the precharge relay 42. The main positive control ground terminal K1- and the precharge control ground terminal K2- of the electronic control interface are connected to the vehicle ground through the electronic control module. The two ends of the coil of the main positive relay 21 are connected to the main positive control terminal K1+ and the main positive control ground terminal K1- of the electronic control interface, respectively. The two ends of the coil of the precharge relay 42 are connected to the precharge control terminal K2+ and the precharge control ground terminal K2- of the electronic control interface, respectively.

[0047] Preferably, the main positive relay 21 is a high-side drive relay with a breaking capacity of 200A and controlled by 24V. The main positive fuse 30 is a fuse rated at 800VDC and 400A. The pre-charge resistor 41 is a 40W / 100Ω resistor, specifically model RX24-40W-100RJ. The pre-charge relay 42 is a high-side drive relay with a breaking capacity of 30A and controlled by 24V. The pre-charge fuse 43 is a fuse rated at 750VDC and 50A.

[0048] In actual operation, the electronic control module can first control the pre-charging unit 40 to conduct, so as to pre-charge the bus capacitor in the motor control module. Then, the main positive power supply unit 20 is controlled to conduct, so as to perform high-voltage power-on operation on the motor control module. The power distribution of other high-voltage devices in the vehicle is still completed by the power distribution controller.

[0049] Specifically, during the power-on process, the electronic control module first controls the pre-charge relay 42 to close, pre-charging the bus capacitor in the motor control module. After pre-charging, the current and voltage can be detected. If there are no abnormalities, the main positive relay 21 is then controlled to close, followed by the pre-charge relay 42 being controlled to open. Finally, the voltage is checked to ensure it is sufficient, thus completing the power-on process.

[0050] When power is off, the main positive relay 21 is disconnected by the electronic control module, and then the voltage can be detected to see if it has dropped to the preset range, thus completing the power-off process.

[0051] When an abnormality is detected in the current or voltage at any time, the electronic control module will control the main positive relay 21 and the pre-charge relay 42 to disconnect and report the relevant fault.

[0052] like Figure 2 As shown, the box body 10 includes a fixedly installed bottom box 11 and a top cover 12. The top cover 12 is fixedly installed on the top of the bottom box 11. Only a portion of the top cover 12 is shown in the figure. A sealing ring (not shown in the figure) is provided between the bottom box 11 and the top cover 12.

[0053] In one embodiment, both the bottom box 11 and the top cover 12 are made of sheet metal bending parts, and the sealing ring is preferably a foamed sponge ring. The aforementioned main positive power supply unit 20, main positive fuse 30, pre-charge unit 40, copper busbar group and insulating column are all fixedly installed on the bottom box 11, and the battery pack interface 51, controller interface 52, motor control interface 53 and electronic control interface 54 are all installed on the bottom box 11.

[0054] like Figure 2 As shown, the copper busbar assembly is used for the connection between the battery pack interface 51 and the controller interface 52, as well as the connection between the main positive power supply unit 20 and the pre-charge unit 40 and the battery pack interface 51. The copper busbar assembly is fixedly installed to the base box 11 via insulating posts.

[0055] In one embodiment, the copper busbar group includes a first copper busbar 81 and a second copper busbar 82. The first copper busbar 81 is connected to the negative terminal B- of the battery pack interface and the negative terminal Xin1- of the controller interface. Preferably, the first copper busbar 81 is also connected to the negative terminal MCU- of the motor control interface.

[0056] The second copper busbar 82 is connected to the positive terminal B+ of the battery pack interface, the positive terminal Xin1+ of the controller interface, the first terminal of the main positive relay 21 switch, and the first terminal of the pre-charge resistor 41.

[0057] Preferably, the copper busbar group may further include a third copper busbar 83, which is connected to the second terminal of the main positive relay 21 switch, the second terminal of the precharge fuse 43 and the second terminal of the main positive fuse 30.

[0058] In one embodiment, seven insulating posts are provided, respectively located at the connection points of the first copper busbar 81 with the negative terminal B- of the battery pack interface, the negative terminal Xin1- of the controller interface, and the negative terminal MCU- of the motor control interface; at the connection points of the second copper busbar 82 with the positive terminal B+ of the battery pack interface and the positive terminal Xin1+ of the controller interface; and at the connection points of the third copper busbar 83 with the second end of the main positive fuse 30 and the first end of the main positive fuse 30 with the positive terminal MCU+ of the motor control interface.

[0059] like Figure 2As shown, the mounting feet 60 are installed on the outside of the chassis 11 and make electrical contact with the chassis 11. The mounting feet 60 are used for fixed installation with the frame and make electrical contact with the frame. The mounting feet 60 can connect the chassis 11 to the ground of the vehicle.

[0060] The grounding terminal 70 is fixedly installed on the housing 10 and makes electrical contact with the housing 10. The grounding terminal 70 is used to connect to the vehicle ground.

[0061] Preferably, the grounding terminal 70 can be an M5 threaded nut post, which is riveted to the base box 11. The grounding terminal 70 can be connected via a 4mm thread. 2 The PE line is connected to the vehicle chassis.

[0062] In one embodiment, the outer surface of the housing 10 is at least partially covered with an insulating layer. Preferably, the outer surface of the top cover 12 is entirely covered with an insulating layer, and the outer surface of the bottom box 11, except for the portion in contact with the mounting feet 60, is also covered with an insulating layer.

[0063] In one embodiment, the inner surface of the housing 10 is at least partially covered with an insulating layer. Preferably, the inner surface of the top cover 12 is covered with an insulating layer, and the inner surface of the bottom box 11 is also covered with an insulating layer.

[0064] Preferably, the above-mentioned insulating layer is a black paint powder coating layer.

[0065] This embodiment also provides a power distribution system, including a power distribution controller and the aforementioned vehicle-mounted high-voltage junction box, wherein the controller interface 52 of the vehicle-mounted high-voltage junction box is connected to the power distribution controller.

[0066] In one embodiment, the power distribution controller can be an auxiliary PDU (Power Distribution Unit, high-voltage power distribution unit) for new energy vehicles. The auxiliary PDU typically integrates the power distribution functions of various high-voltage electrical equipment such as on-board chargers, DC-DC converters, and air conditioning compressors, but does not directly supply power to the motor control module.

[0067] In other embodiments, the power distribution controller can also be the assembly PDU of the new energy vehicle. The assembly PDU usually integrates the power distribution functions of various high-voltage electrical equipment, including the motor control module. It should be noted that when using the assembly PDU, the assembly PDU is not connected to the motor controller or does not perform power distribution control on the motor controller. The power distribution control of the motor controller is achieved by the on-board high-voltage junction box in this solution.

[0068] This solution's on-board high-voltage junction box and power distribution system feature a dual PDU architecture, effectively separating the motor control module from the power distribution controllers of other high-voltage components for independent power distribution control, thus adapting to most vehicle models. For projects with single-machine requirements, especially modified vehicle projects, purchasing existing PDU products often necessitates modifying existing products or even developing entirely new structures to meet vehicle modification needs. This is not only time-consuming and labor-intensive but also significantly increases modification costs. However, the on-board high-voltage junction box using this solution, due to its greater versatility, can directly and completely replace the MCU power distribution section in the original PDU. This cleverly avoids the risks of finding suppliers and their products upfront and achieves most of the original PDU functions at a lower cost.

[0069] This significantly reduces the difficulty of customizing the PDU architecture for modified vehicles, not only saving costs and reducing procurement difficulties and sample production cycles, but also basically meeting the basic functional and simple protection measures required for a single sample of a modified vehicle. This plays an extremely important foundational role in the advancement and cost control of the entire modified vehicle project.

[0070] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0071] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains 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.

Claims

1. A vehicle-mounted high-voltage junction box, characterized in that, It includes a housing, a main positive power supply unit, a pre-charging unit, a battery pack interface, a controller interface, a motor control interface, and an electronic control interface. The main positive power supply unit and the pre-charging unit are located inside the housing, while the battery pack interface, the controller interface, the motor control interface, and the electronic control interface are mounted on the housing. The battery pack interface is used to connect to an external battery pack, and the controller interface is used to connect to an external power distribution controller to supply power to the power distribution controller. The motor control interface is used to connect to an external motor control module. The main positive power supply unit is connected to the battery pack interface and the motor control interface to supply power to the motor control module based on its own on / off control. The pre-charging unit is connected to the battery pack interface and the motor control interface to supply power to the motor control module based on its own on / off control. The electronic control interface is used to connect to an external electronic control module. The main positive power supply unit and the pre-charging unit are connected to the electronic control interface to turn on or off based on the control of the electronic control module.

2. The vehicle-mounted high-voltage junction box according to claim 1, characterized in that, The main positive power supply unit includes a main positive relay. The first terminal of the main positive relay switch is connected to the battery pack interface, the second terminal of the main positive relay switch is connected to the motor control interface, and the two ends of the main positive relay coil are connected to the electronic control interface.

3. The vehicle-mounted high-voltage junction box according to claim 1, characterized in that, The pre-charge unit includes a pre-charge relay, a pre-charge fuse, and a pre-charge resistor. The switch of the pre-charge relay, the pre-charge fuse, and the pre-charge resistor are connected in series between the battery pack interface and the motor control interface. The two ends of the coil of the pre-charge relay are connected to the electronic control interface.

4. The vehicle-mounted high-voltage junction box according to claim 1, characterized in that, The vehicle-mounted high-voltage junction box also includes a main positive fuse disposed inside the box. The first end of the main positive fuse is connected to the motor control interface, and the second end of the main positive fuse is connected to the main positive power supply unit and the pre-charging unit.

5. The vehicle-mounted high-voltage junction box according to claim 1, characterized in that, The vehicle-mounted high-voltage junction box also includes mounting feet, which are installed on the outside of the box and make electrical contact with the box. The mounting feet are used for fixed installation to the vehicle frame and make electrical contact with the vehicle frame; and / or The vehicle-mounted high-voltage junction box also includes a grounding terminal, which is fixedly installed on the box body and makes electrical contact with the box body.

6. The vehicle-mounted high-voltage junction box according to claim 1, characterized in that, The outer surface of the box is at least partially covered with an insulating layer and / or the inner surface of the box is at least partially covered with an insulating layer.

7. The vehicle-mounted high-voltage junction box according to claim 1, characterized in that, The box body includes a fixedly installed base box and a top cover, and a sealing ring is provided between the base box and the top cover.

8. The vehicle-mounted high-voltage junction box according to claim 1, characterized in that, The vehicle-mounted high-voltage junction box also includes a copper busbar assembly disposed within the box body. The copper busbar assembly is used for the connection between the battery pack interface and the controller interface, as well as the connection between the main positive power supply unit and the pre-charge unit and the battery pack interface.

9. The vehicle-mounted high-voltage junction box according to claim 8, characterized in that, The vehicle-mounted high-voltage junction box also includes an insulating column, and the copper busbar assembly is fixedly installed to the box body through the insulating column.

10. A power distribution system, characterized in that, It includes a power distribution controller and a vehicle-mounted high-voltage junction box as described in any one of claims 1 to 9, wherein the controller interface is connected to the power distribution controller.

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