Hydrogen energy vehicle pre-charging and discharging system and pre-charging and high-voltage discharging method thereof

Abstract

The present invention discloses a pre-charging and discharging system for hydrogen energy vehicles and a method for charging and reducing high voltage. The high-voltage auxiliary power supply, the first pre-charging circuit and the motor controller of the present invention are connected in series to form a closed circuit, the fuel-electric boost FCDC is connected in parallel at both ends of the high-voltage auxiliary power supply, and the voltage reduction DCL is connected in parallel at both ends of the motor controller; the second pre-charging circuit, the fuel-electric air compressor controller and the high-voltage components are connected in series in sequence to form a branch circuit, and the branch circuit is connected in parallel at both ends of the high-voltage auxiliary power supply; the warm air PTC is connected in parallel at both ends of the high-voltage auxiliary power supply; the fuel-electric PTC is connected in parallel at both ends of the high-voltage auxiliary power supply. In the present invention, when the fuel-electric air compressor controller and the high-voltage components do not have an active discharge function, the warm air PTC or the fuel-electric PTC of the whole vehicle is used for discharge, shortening the high-voltage discharge time of the supporting capacitor, allowing the whole vehicle drive motor to first perform high-voltage power reduction without waiting for the purge process of the fuel cell system, and pre-charging is performed separately.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogen energy vehicles, and in particular to a hydrogen energy vehicle precharging and discharging system and a precharging and high voltage discharging method thereof. Background Art

[0002] my country's fuel cell buses have completed commercial demonstration operations, and fuel cell passenger cars are also developing rapidly. Various performance indicators have basically met the operational requirements and are beginning to move towards large-scale industrialization. However, for a new energy system to be promoted and applied, its safety should be the first concern. In the existing technology, the vehicle drive motor and the fuel-electric air compressor are pre-charged at the same time, which poses certain safety risks during the charging and power-off process, and the power-off time is long. Summary of the invention

[0003] The purpose of the present invention is to address the above-mentioned deficiencies in the prior art and to provide a hydrogen energy vehicle pre-charging and discharging system with high safety and short charging and discharging time and a pre-charging and high-voltage power-down method thereof.

[0004] A hydrogen energy vehicle pre-charging and discharging system of the present invention comprises a high-voltage auxiliary power supply, a fuel-electric boost FCDC, a motor controller, a voltage reduction DCL, a fuel-electric air compressor controller, a high-voltage component, a first pre-charging circuit, a second pre-charging circuit, a warm air PTC and a fuel-electric PTC;

[0005] The motor controller is electrically connected to the vehicle drive motor, and the fuel-electric air compressor controller is electrically connected to the air compressor motor;

[0006] The high-voltage auxiliary power supply, the first pre-charging circuit and the motor controller are connected in series to form a closed circuit, the fuel-electric boost FCDC is connected in parallel at both ends of the high-voltage auxiliary power supply, and the step-down DCL is connected in parallel at both ends of the motor controller;

[0007] The second pre-charging circuit, the fuel-electric air compressor controller and the high-voltage component are sequentially connected in series to form a branch circuit, and the branch circuit is connected in parallel at both ends of the high-voltage auxiliary power supply;

[0008] The first pre-charging circuit includes a switch K0, a switch K1 and a first pre-charging resistor R1, the switch K1 and the first pre-charging resistor R1 are connected in series in the closed circuit, and the switch K0 is connected in parallel to both ends of the switch K1 and the first pre-charging resistor R1; the second pre-charging circuit includes a switch K2, a switch K3 and a second pre-charging resistor R2, the switch K3 and the second pre-charging resistor R2 are connected in series in the branch, and the switch K2 is connected in parallel to both ends of the switch K3 and the second pre-charging resistor R2;

[0009] The heating PTC is connected in parallel to both ends of the high-voltage auxiliary power supply through a switch K4;

[0010] The fuel-electric PTC is connected in parallel to both ends of the high-voltage auxiliary power supply through a switch K5;

[0011] A switch K6 is provided at the output end of the high voltage auxiliary power supply.

[0012] As mentioned above, in the high-voltage power-down method of the pre-charging and discharging system of a hydrogen energy vehicle, when the fuel-electric air compressor and the high-voltage components do not have an active discharge function, the heater PTC or the fuel-electric PTC is used to discharge, so that the supporting capacitors of the fuel-electric air compressor controller and the high-voltage components can be discharged as quickly as possible.

[0013] Furthermore, the specific implementation method of discharging by the warm air PTC is as follows:

[0014] When the high voltage of the whole vehicle is powered off, the switch K6, switch K0 and switch K1 are disconnected, and the motor controller starts to discharge the motor by the active discharge function, and the whole vehicle drive motor is powered off after the discharge is completed; then the switch K2 is closed in sequence, the switch K3 is disconnected, and the switch K4 is closed, the fuel-electric air compressor controller and the warm air PTC are connected, and the heat generated by the warm air PTC is used up to consume the power of the fuel-electric air compressor controller and the supporting capacitor of the high-voltage component, and the active discharge of the fuel-electric air compressor controller and the high-voltage component is completed;

[0015] Furthermore, the specific implementation method of discharging by the fuel-electric PTC is as follows:

[0016] When the high voltage of the whole vehicle is powered off, the switch K6, switch K0 and switch K1 are disconnected, and the motor controller starts to discharge by its active discharge function, and the drive motor of the whole vehicle is powered off after the discharge is completed; then the switch K2 is closed in sequence, the switch K3 is disconnected, and the switch K5 is closed, the fuel-electric air compressor controller, the fuel-electric PTC and the high-voltage components are connected, and the heat generated by the operation of the fuel-electric PTC consumes the electricity of the support capacitors of the fuel-electric air compressor controller and the high-voltage components, completing the active discharge of the fuel-electric air compressor controller and the high-voltage components.

[0017] As mentioned above, in a high-voltage power-off method for a pre-charging and discharging system of a hydrogen energy vehicle, when the fuel-electric air compressor and the high-voltage components have an active discharge function, during the high-voltage power-off process, the switch K6, the switch K0 and the switch K1 are disconnected, and the motor controller starts the active discharge function to discharge it, and after the discharge is completed, the vehicle drive motor is powered off; then the switch K2 and the switch K3 are disconnected, and the fuel-electric air compressor controller uses the active discharge function to discharge it and the high-voltage components, and after the discharge is completed, the branch circuit is powered off.

[0018] As mentioned above, a precharging method for a precharging and discharging system of a hydrogen energy vehicle has the following specific process: when the whole vehicle is powered on at high voltage, the switch K6 is closed, and then the switch K1 is closed first, and the current is limited through the first precharging resistor R1. The high voltage from the high-voltage auxiliary power supply and the fuel-electric boost FCDC is first used to precharge the motor controller and the step-down DCL. After the precharging is completed, the switch K0 is first closed and then the switch K1 is disconnected to complete the precharging of the motor controller and the step-down DCL; then the switch K3 is closed to precharge the fuel-electric air compressor controller and the high-voltage components. After the precharging is completed, the switch K2 is first closed and then the switch K3 is disconnected to complete the precharging of the fuel-electric air compressor controller and the high-voltage components.

[0019] As mentioned above, a precharging method for a precharging and discharging system of a hydrogen energy vehicle has the following specific process: when the whole vehicle is powered on at high voltage, the switch K6 is closed, and then the switch K3 is closed first, and the current is limited through the second precharging resistor R2, and the fuel-electric air compressor controller and the high-voltage components are precharged. After the precharging is completed, the switch K2 is closed first and then the switch K3 is opened to complete the precharging of the fuel-electric air compressor controller and the high-voltage components; then the switch K1 is closed, and the high voltage from the high-voltage auxiliary power supply and the fuel-electric boost FCDC will first precharge the motor controller and the step-down DCL. After the precharging is completed, the switch K0 is closed and then the switch K1 is opened to complete the precharging of the motor controller and the step-down DCL.

[0020] As mentioned above, a precharging method for a precharging and discharging system of a hydrogen energy vehicle has the following specific process: when the high voltage of the whole vehicle is powered on, the switch K6 is closed, and then the switch K1 and the switch K3 are closed at the same time, and the fuel-electric air compressor controller and the high-voltage components are pre-charged through the first pre-charging resistor R1 and the second pre-charging resistor R2 for current limiting. After the pre-charging is completed, the switch K2 or the switch K0 corresponding to the corresponding pre-charged circuit is closed first, and then the corresponding switch K1 and the switch K3 are disconnected to complete the pre-charging of the fuel-electric air compressor controller and the high-voltage components, the motor controller and the step-down DCL.

[0021] A hydrogen energy vehicle pre-charging and discharging system of the present invention can discharge by the heater PTC or the fuel-electric PTC of the whole vehicle when the fuel-electric air compressor controller and other high-voltage components of the hydrogen energy vehicle do not have an active discharge function, so that the supporting capacitors of the fuel-electric air compressor controller and other high-voltage components can be discharged as soon as possible, shortening the high-voltage discharge time of the supporting capacitors and improving the safety of the fuel-electric air compressor controller.

[0022] A hydrogen energy vehicle precharging and discharging system of the present invention performs precharging of the vehicle drive motor and the fuel-electric air compressor separately during the high-voltage power-on process of the hydrogen fuel cell vehicle. During the high-voltage power-off process of the hydrogen fuel cell vehicle, due to the characteristics of the fuel cell, the vehicle needs to be purged before the high-voltage power-off before it can be shut down. At this time, the design based on the dual precharging circuit allows the vehicle drive motor to be powered off at high voltage first without waiting for the purging process of the fuel cell system, thereby improving the safety of powering off the vehicle drive motor and preventing the vehicle drive motor from still carrying high voltage when the hydrogen fuel cell vehicle is purged before powering off, posing a safety risk. The dual precharging circuit of the hydrogen fuel cell vehicle of the present invention can also prevent the motor from still carrying high voltage when the vehicle is shut down for charging, thereby reducing the existing safety risks. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of a hydrogen energy vehicle pre-charging and discharging system of the present invention.

[0024] 1. High-voltage auxiliary power supply; 2. Fuel-electric boost FCDC; 3. Motor controller; 4. Step-down DCL; 5. Fuel-electric air compressor controller; 6. High-voltage components; 7. First pre-charging circuit; 8. Second pre-charging circuit; 9. Warm air PTC; 10. Fuel-electric PTC; 11. Vehicle drive motor; 12. Air compressor motor. DETAILED DESCRIPTION

[0025] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0026] like Figure 1 As shown, a hydrogen energy vehicle pre-charging and discharging system of the present invention includes a high-voltage auxiliary power supply 1, a fuel-electric boost FCDC2, a motor controller 3, a step-down DCL4, a fuel-electric air compressor controller 5, a high-voltage component 6, a first pre-charging circuit 7, a second pre-charging circuit 8, a warm air PTC 9 and a fuel-electric PTC 10;

[0027] The motor controller 3 is electrically connected to the vehicle drive motor 11, and the fuel-electric air compressor controller 5 is electrically connected to the air compressor motor 12;

[0028] The high-voltage auxiliary power supply 1, the first pre-charging circuit 7 and the motor controller 3 are connected in series to form a closed circuit, the fuel-electric boost FCDC2 is connected in parallel to both ends of the high-voltage auxiliary power supply 1, and the step-down DCL4 is connected in parallel to both ends of the motor controller 3;

[0029] The second pre-charging circuit 8, the gas-electric air compressor controller 5 and the high-voltage component 6 are sequentially connected in series to form a branch circuit, and the branch circuit is connected in parallel to both ends of the high-voltage auxiliary power supply 1;

[0030] The heating air PTC 9 is connected in parallel to both ends of the high voltage auxiliary power supply 1 through the switch K4;

[0031] The fuel-electric PTC 10 is connected in parallel to both ends of the high-voltage auxiliary power supply 1 through the switch K5;

[0032] A switch K6 is provided at the output end of the high voltage auxiliary power supply 1 .

[0033] Furthermore, the first pre-charging circuit 7 includes a switch K0, a switch K1 and a first pre-charging resistor R1, the switch K1 and the first pre-charging resistor R1 are connected in series in a closed circuit, and the switch K0 is connected in parallel at both ends of the switch K1 and the first pre-charging resistor R1; the second pre-charging circuit 8 includes a switch K2, a switch K3 and a second pre-charging resistor R2, the switch K3 and the second pre-charging resistor R2 are connected in series on a branch, and the switch K2 is connected in parallel at both ends of the switch K3 and the second pre-charging resistor R2.

[0034] As mentioned above, in the high-voltage power-down method of the pre-charging and discharging system of a hydrogen energy vehicle, when the fuel-electric air compressor and the high-voltage component 6 do not have the active discharge function, the heater PTC 9 or the fuel-electric PTC 10 is used to discharge, so that the supporting capacitors of the fuel-electric air compressor controller 5 and the high-voltage component 6 can be discharged as soon as possible.

[0035] The switch K0 may include a first high voltage positive main positive relay or contactor.

[0036] The switch K1 may include a first high voltage pre-charge relay or contactor.

[0037] The switch K2 may include a second high voltage positive main positive relay or contactor.

[0038] Switch K3 may include a second high voltage pre-charge relay or contactor.

[0039] The function of switch K4 is to control the high voltage input of the heater PTC to be turned on or off.

[0040] The function of switch K5 is to control the high voltage input of the fuel-electric PTC to be turned on or off.

[0041] The function of the step-down DCL4 is to convert the vehicle's DC high voltage into DC low voltage;

[0042] The function of the motor controller 3 is to control the speed and torque of the vehicle drive motor 11;

[0043] The function of the vehicle drive motor 11 is to drive the vehicle to travel;

[0044] The function of the air compressor motor 12 is to increase the pressure of the fuel cell air path and input it to the fuel cell stack;

[0045] The function of the gas-electric air compressor controller 5 is to control the speed, start and stop of the air compressor motor 12;

[0046] The function of the fuel-electric boost FCDC19 is to boost the output voltage of the fuel cell and provide it to the vehicle. It has a directional diode inside so no pre-charging is required at its output end.

[0047] High voltage component 6 refers to a high voltage component 6 or accessory having a supporting capacitor or other capacitor inside;

[0048] The function of the warm air PTC is to provide warm air to users by generating heat by heating the air;

[0049] The function of the fuel cell PTC is to heat the circulating water of the air compressor, boost FCDC, etc. of the fuel cell system, thereby realizing the heating function of the cooling water.

[0050] The specific implementation method of discharging by the warm air PTC9 is as follows:

[0051] When the high voltage of the whole vehicle is powered off, the switch K6, the switch K0 and the switch K1 are disconnected, and the motor controller 3 starts to discharge the motor by the active discharge function, and the whole vehicle drive motor 11 is powered off after the discharge is completed; then the switch K2 is closed in sequence, the switch K3 is disconnected, and the switch K4 is closed, the fuel-electric air compressor controller 5 and the heater PTC9 are connected, and the heat generated by the operation of the heater PTC9 consumes the power of the fuel-electric air compressor controller 5 and the support capacitor of the high-voltage component 6, completing the active discharge of the fuel-electric air compressor controller 5 and the high-voltage component 6;

[0052] The specific method of discharging by the fuel-electric PTC10 is as follows:

[0053] When the high voltage of the whole vehicle is powered off, the switches K6, K0 and K1 are disconnected, and the motor controller 3 starts to discharge by its active discharge function. After the discharge is completed, the drive motor 11 of the whole vehicle is powered off; then the switches K2 are closed in sequence, the switch K3 is disconnected, and the switch K5 is closed, the fuel-electric air compressor controller 5, the fuel-electric PTC 10 and the high-voltage component 6 are connected, and the fuel-electric PTC 10 generates heat to consume the electricity of the support capacitors of the fuel-electric air compressor controller 5 and the high-voltage component 6, thereby completing the active discharge of the fuel-electric air compressor controller 5 and the high-voltage component 6.

[0054] A pre-charging and discharging system for a hydrogen energy vehicle of the present invention can discharge by the heater PTC 9 or the fuel-electric PTC 10 of the whole vehicle when the fuel-electric air compressor controller 5 and other high-voltage components 6 of the hydrogen energy vehicle do not have an active discharge function, so that the supporting capacitors of the fuel-electric air compressor controller 5 and other high-voltage components 6 can be discharged as soon as possible, shortening the high-voltage discharge time of the supporting capacitors and improving the safety of the fuel-electric air compressor controller 5.

[0055] As mentioned above, in a high-voltage power-off method for a pre-charging and discharging system of a hydrogen energy vehicle, when the fuel-electric air compressor and the high-voltage component 6 have an active discharge function, during the high-voltage power-off process, the switch K6, the switch K0 and the switch K1 are disconnected, and the motor controller 3 starts the active discharge function to discharge it, and after the discharge is completed, the vehicle drive motor 11 is powered off; then the switch K2 and the switch K3 are disconnected, and the fuel-electric air compressor controller 5 starts the active discharge function to discharge it and the high-voltage component 6, and after the discharge is completed, the branch circuit is powered off.

[0056] As mentioned above, a precharging method for a precharging and discharging system of a hydrogen energy vehicle has the following specific process: when the whole vehicle is powered on at high voltage, the switch K6 is closed, and then the switch K1 is closed first, and the current is limited through the first pre-charging resistor R1. The high voltage from the high-voltage auxiliary power supply 1 and the fuel-electric boost FCDC2 is first used to pre-charge the motor controller 3 and the step-down DCL4. After the pre-charging is completed, the switch K0 is closed first and then the switch K1 is disconnected to complete the pre-charging of the motor controller 3 and the step-down DCL4; then the switch K3 is closed to pre-charge the fuel-electric air compressor controller 5 and the high-voltage component 6. After the pre-charging is completed, the switch K2 is closed first and then the switch K3 is disconnected to complete the pre-charging of the fuel-electric air compressor controller 5 and the high-voltage component 6.

[0057] As mentioned above, a precharging method for a precharging and discharging system of a hydrogen energy vehicle has the following specific process: when the whole vehicle is powered on at high voltage, the switch K6 is closed, and then the switch K3 is closed first, and the current is limited through the second precharging resistor R2, and the fuel-electric air compressor controller 5 and the high-voltage component 6 are pre-charged. After the pre-charging is completed, the switch K2 is closed first and then the switch K3 is opened to complete the pre-charging of the fuel-electric air compressor controller 5 and the high-voltage component 6; then the switch K1 is closed, and the high voltage from the high-voltage auxiliary power supply 1 and the fuel-electric boost FCDC2 will first pre-charge the motor controller 3 and the step-down DCL4. After the pre-charging is completed, the switch K0 is closed and then the switch K1 is opened to complete the pre-charging of the motor controller 3 and the step-down DCL4.

[0058] As mentioned above, a precharging method for a precharging and discharging system of a hydrogen energy vehicle has the following specific process: when the high voltage of the whole vehicle is powered on, the switch K6 is closed, and then the switch K1 and the switch K3 are closed at the same time, and the fuel-electric air compressor controller 5 and the high-voltage component 6 are pre-charged through the first pre-charging resistor R1 and the second pre-charging resistor R2 for current limiting. After the pre-charging is completed, the corresponding switch K2 or switch K0 corresponding to the pre-charged circuit is closed first, and then the corresponding switch K1 and switch K3 are opened to complete the pre-charging of the fuel-electric air compressor controller 5 and the high-voltage component 6, the motor controller 3 and the step-down DCL4.

[0059] A hydrogen energy vehicle precharging and discharging system of the present invention performs precharging of the vehicle drive motor 11 and the fuel-electric air compressor separately during the high-voltage power-on process of the hydrogen fuel cell vehicle. During the high-voltage power-off process of the hydrogen fuel cell vehicle, due to the characteristics of the fuel cell, the vehicle needs to be purged before the high-voltage power-off before it can be shut down. At this time, the design based on the dual precharging circuit allows the vehicle drive motor 11 to be powered off at high voltage first without waiting for the purging process of the fuel cell system, thereby improving the safety of powering off the vehicle drive motor 11 and preventing the vehicle drive motor 11 from still carrying high voltage when the hydrogen fuel cell vehicle is purged before powering off, posing a safety risk. The dual precharging circuit of the hydrogen fuel cell vehicle of the present invention can also prevent the motor from still carrying high voltage when the vehicle is shut down for charging, posing a safety risk.

[0060] For matters not mentioned above, the prior art applies.

[0061] Although some specific embodiments of the present invention have been described in detail through examples, those skilled in the art should understand that the above examples are for illustration only and are not intended to limit the scope of the present invention. Those skilled in the art to which the present invention belongs may make various modifications or supplements to the specific embodiments described or replace them in a similar manner, but they will not deviate from the direction of the present invention or exceed the scope defined by the attached claims. Those skilled in the art should understand that any modifications, equivalent substitutions, improvements, etc. made to the above embodiments based on the technical essence of the present invention should be included in the protection scope of the present invention.

Claims

1. A hydrogen energy vehicle pre-charging and discharging system, characterized in that: It comprises a high-voltage auxiliary power supply (1), a fuel-electric boost FCDC (2), a motor controller (3), a voltage reduction DCL (4), a fuel-electric air compressor controller (5), a high-voltage component (6), a first pre-charging circuit (7), a second pre-charging circuit (8), a heating PTC (9) and a fuel-electric PTC (10); The motor controller (3) is electrically connected to the vehicle drive motor (11), and the fuel-electric air compressor controller (5) is electrically connected to the air compressor motor (12); The high-voltage auxiliary power supply (1), the first pre-charging circuit (7) and the motor controller (3) are connected in series to form a closed circuit, the fuel-electric boost FCDC (2) is connected in parallel to both ends of the high-voltage auxiliary power supply (1), and the step-down DCL (4) is connected in parallel to both ends of the motor controller (3); The second pre-charging circuit (8), the fuel-electric air compressor controller (5) and the high-voltage component (6) are sequentially connected in series to form a branch circuit, and the branch circuit is connected in parallel to both ends of the high-voltage auxiliary power supply (1); The first pre-charging circuit (7) comprises a switch K0, a switch K1 and a first pre-charging resistor R1, wherein the switch K1 and the first pre-charging resistor R1 are connected in series on the closed circuit, and the switch K0 is connected in parallel at both ends of the switch K1 and the first pre-charging resistor R1; the second pre-charging circuit (8) comprises a switch K2, a switch K3 and a second pre-charging resistor R2, wherein the switch K3 and the second pre-charging resistor R2 are connected in series on the branch circuit, and the switch K2 is connected in parallel at both ends of the switch K3 and the second pre-charging resistor R2; The heating PTC (9) is connected in parallel to both ends of the high-voltage auxiliary power supply (1) via a switch K4; The fuel-electric PTC (10) is connected in parallel to both ends of the high-voltage auxiliary power supply (1) via a switch K5; A switch K6 is provided at the output end of the high-voltage auxiliary power supply (1).

2. A high voltage power-down method for a hydrogen energy vehicle pre-charging and discharging system as claimed in claim 1, characterized in that: When the gas-electric air compressor controller (5) and the high-voltage component (6) do not have an active discharge function, the heating PTC (9) or the gas-electric PTC (10) is used to discharge, so that the support capacitors of the gas-electric air compressor controller (5) and the high-voltage component (6) are discharged as quickly as possible.

3. A high voltage power-down method for a hydrogen energy vehicle pre-charging and discharging system as claimed in claim 2, characterized in that: The specific implementation method of discharging by the warm air PTC (9) is as follows: When the high voltage of the whole vehicle is powered off, the switch K6, the switch K0 and the switch K1 are disconnected, and the motor controller (3) starts to discharge the motor by its active discharge function, and after the discharge is completed, the whole vehicle drive motor (11) is powered off; then the switch K2 is closed in sequence, the switch K3 is disconnected, and the switch K4 is closed, and the gas-electric air compressor controller (5) and the heater PTC (9) are connected, and the heat generated by the operation of the heater PTC (9) consumes the electricity of the support capacitor of the gas-electric air compressor controller (5) and the high voltage component (6), completing the active discharge of the gas-electric air compressor controller (5) and the high voltage component (6).

4. A high voltage power-down method for a hydrogen energy vehicle pre-charging and discharging system as claimed in claim 2, characterized in that: The specific method of discharging by the fuel-electric PTC (10) is as follows: When the high voltage of the whole vehicle is powered off, the switch K6, the switch K0 and the switch K1 are disconnected, and the motor controller (3) starts to discharge the motor by its active discharge function, and after the discharge is completed, the whole vehicle drive motor (11) is powered off; then the switch K2 is closed, the switch K3 is disconnected, and the switch K5 is closed, and the gas-electric air compressor controller (5), the gas-electric PTC (10) and the high voltage component (6) are connected, and the heat generated by the gas-electric PTC (10) is used up to complete the active discharge of the gas-electric air compressor controller (5) and the high voltage component (6).

5. A high voltage power-down method for a hydrogen energy vehicle pre-charging and discharging system as claimed in claim 3 or 4, characterized in that: In the case where the gas-electric air compressor and the high-voltage component (6) have an active discharge function, during the high-voltage power-off process, the switch K6, the switch K0 and the switch K1 are disconnected, and the motor controller (3) starts the active discharge function to discharge the motor, and after the discharge is completed, the vehicle drive motor (11) is powered off; then the switch K2 and the switch K3 are disconnected, and the gas-electric air compressor controller (5) starts the active discharge function to discharge the motor and the high-voltage component (6), and after the discharge is completed, the branch circuit is powered off.

6. A precharging method for a hydrogen energy vehicle precharging and discharging system as claimed in claim 1, characterized in that: The specific process is as follows: when the vehicle is powered on at high voltage, the switch K6 is closed, and then the switch K1 is closed first, and the current is limited through the first pre-charging resistor R1. The high voltage from the high-voltage auxiliary power supply (1) and the fuel-electric boost FCDC (2) is first used to pre-charge the motor controller (3) and the step-down DCL (4). After the pre-charging is completed, the switch K0 is first closed and then the switch K1 is opened to complete the pre-charging of the motor controller (3) and the step-down DCL (4); then the switch K3 is closed to pre-charge the fuel-electric air compressor controller (5) and the high-voltage component (6). After the pre-charging is completed, the switch K2 is first closed and then the switch K3 is opened to complete the pre-charging of the fuel-electric air compressor controller (5) and the high-voltage component (6).

7. A precharging method for a hydrogen energy vehicle precharging and discharging system as claimed in claim 1, characterized in that: The specific process is as follows: when the vehicle is powered on at high voltage, the switch K6 is closed, and then the switch K3 is closed first, and the current is limited through the second pre-charging resistor R2, and the fuel-electric air compressor controller (5) and the high-voltage component (6) are pre-charged. After the pre-charging is completed, the switch K2 is closed first and then the switch K3 is opened to complete the pre-charging of the fuel-electric air compressor controller (5) and the high-voltage component (6); then the switch K1 is closed, and the high voltage from the high-voltage auxiliary power supply (1) and the fuel-electric boost FCDC (2) will first pre-charge the motor controller (3) and the step-down DCL (4). After the pre-charging is completed, the switch K0 is closed and then the switch K1 is opened to complete the pre-charging of the motor controller (3) and the step-down DCL (4).

8. A precharging method for a hydrogen energy vehicle precharging and discharging system as claimed in claim 1, characterized in that: The specific process is as follows: when the vehicle is powered on at high voltage, the switch K6 is closed, and then the switch K1 and the switch K3 are closed at the same time, and the fuel-electric air compressor controller (5) and the high-voltage component (6) are pre-charged through the first pre-charging resistor R1 and the second pre-charging resistor R2 for current limiting. After the pre-charging is completed, the switch K2 or the switch K0 corresponding to the corresponding pre-charged circuit is closed first, and then the corresponding switch K1 and the switch K3 are opened to complete the pre-charging of the fuel-electric air compressor controller (5) and the high-voltage component (6), the motor controller (3) and the step-down DCL (4).

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