Direct current power supply system for vehicle

Abstract

The utility model discloses a direct-current power supply system for a vehicle. The direct-current power supply system comprises an equipment battery, a junction box, a voltage stabilizing module and a boosting module, the equipment battery is a 12V direct current battery, the input end of the junction box is connected with the output end of the equipment battery, and the junction box is used for dividing one path of 12V direct current output by the equipment battery into multiple paths of 12V direct current; the input end of the voltage stabilizing module is connected with the first output end of the junction box; the boosting module comprises a first boosting module and a second boosting module; the input end of the first boosting module is connected with the second output end of the junction box, and the first boosting module is used for boosting the 12V direct current into 24V direct current; the input end of the second boosting module is connected with the third output end of the junction box, and the second boosting module is used for boosting the 12V direct current into 48V direct current; and the output end of the voltage stabilizing module, the output end of the first boosting module and the output end of the second boosting module are respectively connected with electric equipment with different voltage levels on the vehicle.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle power supply, in particular to a direct current power supply system for a vehicle. Background Art

[0002] As vehicle functionality continues to improve, the types and number of electrical devices within the vehicle are rapidly increasing. Traditional power supply systems for modified vehicles typically use a hybrid AC / DC power supply method, converting DC power into AC power through an inverter to power the electrical devices within the vehicle.

[0003] However, because vehicles are mobile devices, the grounding performance of their power supply systems cannot be effectively guaranteed. If the metal casing inside the vehicle becomes charged, it may pose a threat to the safety of the operators inside, resulting in poor safety. In addition, the presence of inverters increases the complexity of the power supply system, resulting in additional power loss during the power conversion process, which is not conducive to efficient energy utilization. Utility Model Content

[0004] To this end, an embodiment of the present invention provides a DC power supply system for a vehicle to solve the problems of poor safety and ineffective energy utilization in existing AC and DC power supply systems for vehicles.

[0005] In order to achieve the above objectives, the present invention provides the following technical solutions:

[0006] A DC power supply system for a vehicle, comprising a device battery, a junction box, a voltage stabilizing module, and a voltage boosting module;

[0007] The device battery is a 12V DC battery, and the device battery is used to output one channel of 12V DC power;

[0008] The input end of the junction box is connected to the output end of the device battery. The junction box is used to divide the 12V DC power output from the device battery into multiple 12V DC power channels. The multiple 12V DC power channels correspond one to one with the multiple output ends of the junction box.

[0009] The input end of the voltage stabilizing module is connected to the first output end of the junction box;

[0010] The boost module includes a first boost module and a second boost module; the input end of the first boost module is connected to the second output end of the junction box, and the first boost module is used to boost the 12V DC power output from the second output end of the junction box to 24V DC power; the input end of the second boost module is connected to the third output end of the junction box, and the second boost module is used to boost the 12V DC power output from the third output end of the junction box to 48V DC power;

[0011] The output end of the voltage stabilizing module, the output end of the first boosting module and the output end of the second boosting module are respectively connected to electrical equipment of different voltage levels on the vehicle.

[0012] Optionally, the number of the first output terminals of the junction box and the number of the voltage stabilizing modules are two respectively, and the first output terminals of the junction box correspond to the voltage stabilizing modules in a one-to-one manner;

[0013] The input end of each voltage stabilizing module is connected to the first output end of the corresponding junction box, the output end of one voltage stabilizing module is connected to the vehicle's computer host and display through a first circuit breaker and a first contactor, and the output end of another voltage stabilizing module is connected to the vehicle's 5G router and encoder through a second circuit breaker and a second contactor.

[0014] Optionally, the number of the second output terminals of the junction box and the number of the first boost modules are two respectively, and the second output terminals of the junction box correspond to the first boost modules in a one-to-one manner;

[0015] The input end of each first boost module is connected to the second output end of the corresponding junction box, the output end of one first boost module is connected to the PLC and industrial control panel of the vehicle through a third circuit breaker and a third contactor, and the output end of another first boost module is connected to the video recorder, switch, contactor and relay of the vehicle through a fourth circuit breaker and a fourth contactor.

[0016] Optionally, the number of the third output terminals of the junction box and the number of the second boost modules are three respectively, and the third output terminals of the junction box correspond to the second boost modules in a one-to-one manner;

[0017] The input end of each second boost module is connected to the third output end of the corresponding junction box, the output end of one second boost module is connected to the first lifting servo module of the vehicle through the fifth circuit breaker and the fifth contactor, the output end of another second boost module is connected to the second lifting servo module of the vehicle through the sixth circuit breaker and the sixth contactor, and the output end of the third second boost module is connected to the left and right and front and rear clamping servo modules of the vehicle through the seventh circuit breaker and the seventh contactor.

[0018] Optionally, the fifth contactor, the sixth contactor and the seventh contactor are all controlled by a relay, and the relay is connected to an emergency stop button on a control panel of the vehicle.

[0019] Optionally, the power supply system further includes a dual power isolator, which connects the device battery and the vehicle starting battery.

[0020] Optionally, the charging interface in the power supply system is a 7-hole national standard charging gun plug.

[0021] Optionally, the junction box, the voltage stabilizing module and the boost module are fixedly mounted on the peripheral side of the device battery via a bracket.

[0022] The utility model has at least the following beneficial effects:

[0023] The utility model provides a DC power supply system for a vehicle, comprising a device battery, a junction box, a voltage stabilizing module and a boost module; the device battery is a 12V DC battery, and the device battery is used to output a 12V DC power path; the input end of the junction box is connected to the output end of the device battery, and the junction box is used to divide the 12V DC power path output by the device battery into multiple 12V DC power paths, and the multiple 12V DC power paths correspond to multiple output ends of the junction box one by one; the input end of the voltage stabilizing module is connected to the first output end of the junction box; the boost module includes a first boost module block and a second boost module; the input end of the first boost module is connected to the second output end of the junction box, and the first boost module is used to boost the 12V DC output from the second output end of the junction box to 24V DC; the input end of the second boost module is connected to the third output end of the junction box, and the second boost module is used to boost the 12V DC output from the third output end of the junction box to 48V DC; the output end of the voltage stabilizing module, the output end of the first boost module and the output end of the second boost module are respectively connected to electrical equipment of different voltage levels on the vehicle. All electrical equipment in this application are powered by a 12V DC battery, which avoids safety hazards caused by poor grounding during vehicle movement. At the same time, through the combined use of the junction box, the voltage stabilizing module and the boost module, a stable DC power supply can be provided for electrical equipment of different voltage levels on the vehicle, which has high safety and no longer requires a complex inverter device, thereby avoiding the additional power loss of the inverter during the power conversion process, thereby improving energy utilization and reducing the overall energy consumption of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the prior art and the present invention, the following briefly introduces the drawings required for describing the prior art and the embodiments of the present invention. Obviously, the drawings described below are merely illustrative, and those skilled in the art can derive other drawings based on the provided drawings without inventive effort.

[0025] The structures, proportions, sizes, etc. illustrated in this specification are intended only to complement the contents disclosed herein and to facilitate understanding and reading by persons familiar with the art. They are not intended to limit the conditions under which the present invention may be implemented. Any structural modifications, changes in proportions, or adjustments in sizes shall remain within the scope of the technical contents disclosed herein without affecting the efficacy and objectives of the present invention.

[0026] Figure 1 A circuit block diagram of a DC power supply system for a vehicle provided by an embodiment of the present utility model;

[0027] Figure 2 A power supply topology diagram of electrical equipment in a DC power supply system for a vehicle provided by an embodiment of the present utility model;

[0028] Figure 3 A circuit schematic diagram of a dual power supply isolator provided in an embodiment of the utility model;

[0029] Figure 4 A circuit diagram of a DC power supply system for a vehicle provided by an embodiment of the present utility model;

[0030] Figure 5 A power supply schematic diagram of a contactor and a relay provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0032] In the description of the present invention, unless otherwise specified, "plurality" means two or more. The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present invention and the above-mentioned drawings are intended to distinguish the objects referred to. For schemes with a sequential flow, this terminology does not necessarily need to be understood as describing a specific order or sequence. For schemes with device structures, this terminology does not distinguish between importance, positional relationships, etc.

[0033] In addition, the terms "including", "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus that includes a series of steps or units is not necessarily limited to those steps or units that have been explicitly listed, but may also include other steps or units that are not explicitly listed but are inherent to these processes, methods, products or apparatuses, or steps or units that are added based on further optimization solutions conceived by the present invention.

[0034] like Figures 1 to 5 As shown, a DC power supply system for a vehicle includes a device battery, a junction box, a voltage stabilizing module, and a boost module;

[0035] The device battery is a 12V DC battery, and the device battery is used to output one channel of 12V DC power;

[0036] The input end of the junction box is connected to the output end of the device battery. The junction box is used to divide the 12V DC power output from the device battery into multiple 12V DC power channels. The multiple 12V DC power channels correspond one to one with the multiple output ends of the junction box.

[0037] The input end of the voltage stabilizing module is connected to the first output end of the junction box;

[0038] The boost module includes a first boost module and a second boost module; the input end of the first boost module is connected to the second output end of the junction box, and the first boost module is used to boost the 12V DC power output from the second output end of the junction box to 24V DC power; the input end of the second boost module is connected to the third output end of the junction box, and the second boost module is used to boost the 12V DC power output from the third output end of the junction box to 48V DC power;

[0039] The output end of the voltage stabilizing module, the output end of the first boosting module and the output end of the second boosting module are respectively connected to electrical equipment of different voltage levels on the vehicle.

[0040] It should be noted that all electrical equipment in the vehicle uses DC power supply, eliminating inverters and AC power supply to ensure the safety of operators to the greatest extent.

[0041] This utility model is based on a modified vehicle and optimizes the original power supply system. The inverter is eliminated and the battery is used to directly supply DC power. The voltage regulator module and the boost module convert the battery's 12V DC into the corresponding 24V and 48V to meet the needs of electrical devices of different voltage levels.

[0042] In the console cabinets, conventional AC-powered equipment, such as computers, video recorders, and switches, was replaced with industrial-grade DC equipment. For example, the rack-mounted computer was replaced with an industrial personal computer, the rack-mounted video recorder was replaced with a vehicle-mounted video recorder, and the rack-mounted switch was replaced with an industrial-grade DIN-rail switch. While maintaining the original functionality, the power supply method was changed.

[0043] The small display in the middle of the driving console was originally powered by DC, and the large display was powered by AC. It was changed to a stand-alone RV TV with a slight adjustment in size to also meet the display requirements.

[0044] The various movements of the work platform were originally driven by AC servo, but were replaced by DC servo of the same power with a voltage of 48V. The 12V was converted into 48V through a DC boost module for power supply.

[0045] Eliminate the power supply air conditioning, modify the vehicle air conditioning, and connect the air outlet to the rear of the platform to meet the environmental control needs of heating and cooling.

[0046] It should be noted that the utility model provides a DC power supply system for vehicles, the hardware of which mainly includes modified vehicles, equipment batteries, dual power isolators, chargers, charging cable reels, etc.

[0047] Connect the 12V positive and negative wires from the device battery to a high-power junction box, which then outputs multiple branches. Classify electrical devices by their rated voltages, and plan those that need to be turned on simultaneously to the same branch.

[0048] The utility model provides a DC power supply system for a vehicle, comprising a device battery, a junction box, a voltage stabilizing module and a boost module; the device battery is a 12V DC battery, and the device battery is used to output a 12V DC power path; the input end of the junction box is connected to the output end of the device battery, and the junction box is used to divide the 12V DC power path output by the device battery into multiple 12V DC power paths, and the multiple 12V DC power paths correspond to multiple output ends of the junction box one by one; the input end of the voltage stabilizing module is connected to the first output end of the junction box; the boost module includes a first boost module block and a second boost module; the input end of the first boost module is connected to the second output end of the junction box, and the first boost module is used to boost the 12V DC output from the second output end of the junction box to 24V DC; the input end of the second boost module is connected to the third output end of the junction box, and the second boost module is used to boost the 12V DC output from the third output end of the junction box to 48V DC; the output end of the voltage stabilizing module, the output end of the first boost module and the output end of the second boost module are respectively connected to electrical equipment of different voltage levels on the vehicle. All electrical equipment in this application are powered by a 12V DC battery, which avoids safety hazards caused by poor grounding during vehicle movement. At the same time, through the combined use of the junction box, the voltage stabilizing module and the boost module, a stable DC power supply can be provided for electrical equipment of different voltage levels on the vehicle, which has high safety and no longer requires a complex inverter device, thereby avoiding the additional power loss of the inverter during the power conversion process, thereby improving energy utilization and reducing the overall energy consumption of the vehicle.

[0049] In one embodiment of the present application, the number of the first output terminals of the junction box and the number of the voltage stabilizing modules are two respectively, and the first output terminals of the junction box correspond to the voltage stabilizing modules one to one;

[0050] The input end of each voltage stabilizing module is connected to the first output end of the corresponding junction box, the output end of one voltage stabilizing module is connected to the vehicle's computer host and display through a first circuit breaker and a first contactor, and the output end of another voltage stabilizing module is connected to the vehicle's 5G router and encoder through a second circuit breaker and a second contactor.

[0051] It should be noted that the 12V power-consuming devices include: 5G router, encoder, computer, and monitor. If the computer and monitor need to be powered on simultaneously, they should be placed on the same branch, and the remaining two power-consuming devices should be placed on a separate branch. Connect the 12V voltage from the splitter to the input of the voltage regulator module. Connect the output of the voltage regulator module to the 12V power supply terminal. Connect the lower end of the power supply terminal to the upper end of each branch circuit breaker. Connect the lower end of the circuit breaker to the upper end of the main contact of the contactor. Connect the lower end of the main contact of the contactor to the power-consuming device.

[0052] In this embodiment, by setting up two voltage stabilizing modules and corresponding them one-to-one with the output ends of the junction box, the stability and flexibility of the system are effectively improved. Each voltage stabilizing module supplies power to a specific device, such as a computer host, a monitor, a 5G router, and an encoder. Through the separate design of the voltage stabilizing modules, the power interference between different devices is reduced, ensuring the independence of power supply for different electrical equipment during operation. The voltage stabilizing module is connected to the electrical equipment through a circuit breaker and a contactor, providing a higher level of safety, so that the power supply system can automatically disconnect the circuit when encountering power anomalies, thereby protecting the normal operation of the equipment. In addition, this independent voltage stabilizing module design can also meet the higher demand for power supply reliability in vehicles, provide stable and continuous power support for different types of equipment, and thus improve the energy efficiency and safety performance of the entire system.

[0053] In one embodiment of the present application, the number of the second output terminals of the junction box and the number of the first boost modules are two, and the second output terminals of the junction box correspond to the first boost modules in a one-to-one manner;

[0054] The input end of each first boost module is connected to the second output end of the corresponding junction box, the output end of one first boost module is connected to the PLC and industrial control panel of the vehicle through a third circuit breaker and a third contactor, and the output end of another first boost module is connected to the video recorder, switch, contactor and relay of the vehicle through a fourth circuit breaker and a fourth contactor.

[0055] It should be noted that 24V power-consuming devices include: PLCs, industrial control panels, video recorders, switches, contactors, and relays. The industrial control panel and PLC need to be powered on simultaneously; these should be routed to the same branch, while the remaining two should be routed to a separate branch. 12V power is drawn from the splitter and connected to the input of a 12V-to-24V step-up module. The output of the step-up module is connected to the 24V power supply terminal. The lower end of the power supply terminal is connected to the upper end of each circuit breaker. The lower end of the circuit breaker is connected to the upper end of the contactor's main contacts. The lower end of the contactor's main contacts is connected to the power-consuming devices.

[0056] In this embodiment, by connecting the second output terminal to the two first boost modules, the efficiency and stability of the system when supplying power to multiple devices at the same time are improved. Each first boost module boosts the 12V voltage to 24V, which is used to power devices such as PLCs and industrial control panels. Through the distribution of the junction box and the boost module, the mutual interference between electrical equipment can be effectively reduced, ensuring the efficient operation of the power supply system. The design of the circuit breaker and contactor further improves the safety of the system, and can cut off the power supply when the circuit is abnormal to prevent equipment damage. The modular design of the system not only simplifies power distribution, but also ensures that the multiple power supplies in the vehicle can work simultaneously, safely and efficiently, reducing energy waste and equipment failure rate, making the system suitable for scenarios that require precise and stable power supply.

[0057] In one embodiment of the present application, the number of the third output terminals of the junction box and the number of the second boost modules are three respectively, and the third output terminals of the junction box correspond one to one to the second boost modules;

[0058] The input end of each second boost module is connected to the third output end of the corresponding junction box, the output end of one second boost module is connected to the first lifting servo module of the vehicle through the fifth circuit breaker and the fifth contactor, the output end of another second boost module is connected to the second lifting servo module of the vehicle through the sixth circuit breaker and the sixth contactor, and the output end of the third second boost module is connected to the left and right and front and rear clamping servo modules of the vehicle through the seventh circuit breaker and the seventh contactor.

[0059] It should be noted that the 48V power-consuming devices include: lift servo 1, lift servo 2, and the left, right, and front and rear clamping servos. Due to the high total power of the servos, no single DC boost module can meet the power requirements of all servos. Therefore, the servos are grouped and powered separately by three boost modules. Three 12V lines are connected from the splitter to the inputs of three 12V-to-48V boost modules. The boost module outputs are connected to the top of the circuit breaker. The bottom of the circuit breaker is connected to the top of the contactor main contacts. The bottom of the contactor main contacts is connected to the servo drive power supply terminals. To power the servos simultaneously, the coils of the three servo power contactors are controlled by the opening point of the same relay. Connect the positive and negative wires from the 24V power supply terminal to the top of the relay opening point. From the bottom of the relay opening point, connect three wires in parallel, each connected to the coils of the three servo power contactors. Connect the positive terminal from the 24V power supply terminal to the common COM point of the PLC output module. Connect the output point of the PLC output module to the upper end of the normally closed contact of the emergency stop switch. Connect the lower end of the normally closed contact of the emergency stop to the positive pole of the relay coil, and the negative pole of the relay coil to the negative pole of the 24V power supply terminal. This connection allows the relay coil to be controlled by the PLC output. In the PLC, the output point is logically controlled to determine whether it is connected. When the output point is connected, the relay coil is energized and the switch is connected. The three contactor coils are energized and the main contacts are connected, achieving synchronous servo power-on control. If an accident occurs during debugging, press the emergency stop button immediately. Regardless of whether the output point of the PLC output module is connected, the relay coil will immediately lose power, the switch will be disconnected, the three servo-powered contactor coils will lose power, the main contacts will be disconnected, and the servo will immediately power on to ensure safety.

[0060] In this embodiment, three second boost modules are connected to different groups of servo devices respectively to ensure that the servo devices can obtain a stable 48V power supply. Through the third output terminal of the junction box, the 12V power is evenly distributed to the second boost module, thereby improving the reliability of the system power supply. This design adapts to the power supply needs of different servo devices in the vehicle, especially for equipment that requires higher power, such as lifting servo, clamping servo, etc., by grouping power supply, it ensures that the power supply of each device is independent and stable. The combination of circuit breakers and contactors further improves the safety of the system. In the event of a power failure or short circuit, the power supply can be quickly disconnected to avoid damage to the equipment. This design effectively solves the problem of power supply stability when multiple devices work in parallel, and is particularly suitable for high-power servo equipment.

[0061] In one embodiment of the present application, the fifth contactor, the sixth contactor, and the seventh contactor are all controlled by a relay, and the relay is connected to an emergency stop button on a control panel of the vehicle.

[0062] In one embodiment of the present application, the power supply system further includes a dual power supply isolator, which connects the device battery and the vehicle starting battery.

[0063] It should be noted that the equipment battery and the vehicle starting battery are the same as before and are still connected to the dual power isolator to borrow power from each other in an emergency.

[0064] In one embodiment of the present application, the charging interface in the power supply system is a 7-hole national standard charging gun plug.

[0065] It should be noted that to ensure a fully DC power supply, the original charging gun was replaced with a motorhome charger. The end connected to the vehicle body still uses a 7-pin national standard charging gun plug, while the AC end connected to the mains power still uses a standard three-phase plug. The 7-pin charging socket on the outside of the vehicle body is connected to the positive and negative poles of the battery according to the corresponding pins of the charger to achieve mains charging.

[0066] In one embodiment of the present application, the junction box, the voltage stabilizing module and the boost module are fixedly mounted on the peripheral side of the device battery via a bracket.

[0067] In this embodiment, the junction box, the voltage stabilizing module, and the boost module are fixed by a bracket to ensure that the power supply system remains stable during vehicle movement or operation, preventing damage to the equipment due to vibration or collision. The module is fixed around the device battery, which not only reduces the length of cables between devices and reduces power loss, but also improves the efficiency of power transmission. This integrated design can effectively utilize the space inside the vehicle while simplifying the installation and maintenance operations of the system. Through this installation method, the power supply system can provide efficient power transmission while maintaining stability, helping to extend the service life of the system and improve the reliability of vehicle operation.

[0068] It's important to note that the positive and negative poles are drawn from the 24V power supply terminal and connected to the upper end of each branch rocker switch. The lower end of the rocker switch is connected to the coil of the branch contactor. In the overall power supply circuit of the equipment, the circuit breaker is usually kept in the on state. When the rocker switch is pressed, the contactor coil is energized and the main contacts are connected, energizing the branch. This allows the power supply of each branch to be controlled by the panel button.

[0069] The above-described embodiments merely represent specific implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the scope of the present invention, all of which fall within the scope of protection of the present invention.

Claims

1. A DC power supply system for a vehicle, characterized in that: Including equipment battery, junction box, voltage regulator module and boost module; The device battery is a 12V DC battery, and the device battery is used to output one channel of 12V DC power; The input end of the junction box is connected to the output end of the device battery. The junction box is used to divide the 12V DC power output from the device battery into multiple 12V DC power channels. The multiple 12V DC power channels correspond one to one with the multiple output ends of the junction box. The input end of the voltage stabilizing module is connected to the first output end of the junction box; The boost module includes a first boost module and a second boost module; the input end of the first boost module is connected to the second output end of the junction box, and the first boost module is used to boost the 12V DC power output from the second output end of the junction box to 24V DC power; the input end of the second boost module is connected to the third output end of the junction box, and the second boost module is used to boost the 12V DC power output from the third output end of the junction box to 48V DC power; The output end of the voltage stabilizing module, the output end of the first boosting module and the output end of the second boosting module are respectively connected to electrical equipment of different voltage levels on the vehicle.

2. A DC power supply system for a vehicle according to claim 1, characterized in that: There are two first output terminals of the junction box and two voltage stabilizing modules, and the first output terminals of the junction box correspond to the voltage stabilizing modules in a one-to-one manner; The input end of each voltage stabilizing module is connected to the first output end of the corresponding junction box, the output end of one voltage stabilizing module is connected to the vehicle's computer host and display through a first circuit breaker and a first contactor, and the output end of another voltage stabilizing module is connected to the vehicle's 5G router and encoder through a second circuit breaker and a second contactor.

3. A DC power supply system for a vehicle according to claim 1, characterized in that: There are two second output terminals of the junction box and two first boost modules, and the second output terminals of the junction box correspond to the first boost modules in a one-to-one manner; The input end of each first boost module is connected to the second output end of the corresponding junction box, the output end of one first boost module is connected to the PLC and industrial control panel of the vehicle through a third circuit breaker and a third contactor, and the output end of another first boost module is connected to the video recorder, switch, contactor and relay of the vehicle through a fourth circuit breaker and a fourth contactor.

4. A DC power supply system for a vehicle according to claim 1, characterized in that: The number of the third output terminals of the junction box and the number of the second boost modules are three respectively, and the third output terminals of the junction box correspond to the second boost modules one to one; The input end of each second boost module is connected to the third output end of the corresponding junction box, the output end of one second boost module is connected to the first lifting servo module of the vehicle through the fifth circuit breaker and the fifth contactor, the output end of another second boost module is connected to the second lifting servo module of the vehicle through the sixth circuit breaker and the sixth contactor, and the output end of the third second boost module is connected to the left and right and front and rear clamping servo modules of the vehicle through the seventh circuit breaker and the seventh contactor.

5. A DC power supply system for a vehicle according to claim 4, characterized in that: The fifth contactor, the sixth contactor, and the seventh contactor are all controlled by a relay, and the relay is connected to an emergency stop button on a control panel of the vehicle.

6. The DC power supply system for a vehicle according to claim 1, characterized in that: The power supply system further includes a dual power supply isolator, which connects the device battery and the vehicle starting battery.

7. The DC power supply system for a vehicle according to claim 1, characterized in that: The charging interface in the power supply system is a 7-hole national standard charging gun plug.

8. The DC power supply system for a vehicle according to claim 1, characterized in that: The junction box, the voltage stabilizing module and the boost module are fixedly mounted on the peripheral side of the device battery through a bracket.

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