Control method of hydrogen-electricity hybrid power system and hydrogen-electricity hybrid power system

Abstract

The invention provides a control method of a hydrogen-electricity hybrid power system and the hydrogen-electricity hybrid power system, the hydrogen-electricity hybrid power system comprises a hydrogen fuel system, a power battery system, a driving system and a control system, and the power battery system comprises a small power battery and a super capacitor bank. In response to a power-on request instruction, the control system obtains the states of the small power battery and the super capacitor bank and the power condition of the driving system; and according to the state and the power condition, the hydrogen fuel system, the small power battery and the super capacitor bank are controlled to provide electric energy for the driving system or recover the electric energy. According to the control method of the hydrogen-electricity hybrid power system and the hydrogen-electricity hybrid power system, effective control can be conducted according to different working conditions.

Description

Technical Field

[0001] The present application relates to the technical field of vehicles, and particularly to a control method for a hydrogen-electric hybrid system and a hydrogen-electric hybrid system. Background Art

[0002] As an important energy source for future net-zero emissions, hydrogen energy has been increasingly emphasized in various fields. Hydrogen fuel vehicles have obvious advantages such as high energy density and net-zero emissions. The hydrogen-electric hybrid system has two energy sources, namely a hydrogen fuel cell and a high-voltage power battery, which takes into account both environmental protection and convenience. Compared with traditional vehicles, the operation mode of this power system is more diverse, becoming a new market demand. Therefore, it is particularly important to accurately and effectively control the power system mode switching of fuel cell vehicles. The existing hydrogen-electric hybrid system needs to use special-formula high-rate charging battery cells or rely on high-power hydrogen stacks to ensure the high-power charge and discharge requirements of the power system under feeding conditions, resulting in high costs and low scale benefits.

[0003] Therefore, it is necessary to provide an improved control method for a hydrogen-electric hybrid system and a hydrogen-electric hybrid system to solve the above problems. Summary of the Invention

[0004] The present application provides a control method for a hydrogen-electric hybrid system and a hydrogen-electric hybrid system that can effectively control different working conditions.

[0005] The present application discloses a control method for a hydrogen-electric hybrid system. The hydrogen-electric hybrid system includes a hydrogen fuel system, a power battery system, a drive system, and a control system. The power battery system includes a small power battery and a supercapacitor bank;

[0006] In response to a power-on request command, the control system controls the hydrogen fuel system, the small power battery, and the supercapacitor bank to provide electrical energy or recover electrical energy to the drive system by obtaining the states of the small power battery and the supercapacitor bank and the power situation of the drive system, and based on the states and the power situation.

[0007] Further, when the drive system is in a power request situation, obtain the requested power value of the drive system;

[0008] If the requested power value is higher than a preset power value, the control system controls the supercapacitor bank to discharge preferentially.

[0009] Further, if the supercapacitor bank is in a dischargeable state, the control system controls the supercapacitor bank to discharge;

[0010] If the supercapacitor bank is not in a dischargeable state and the small power battery is in a dischargeable state, the control system controls the supercapacitor bank to stop discharging and the small power battery to discharge.

[0011] Further, if neither the supercapacitor bank nor the small power battery is in a dischargeable state, the control system controls the supercapacitor bank and the small power battery to stop discharging, and the hydrogen fuel system discharges.

[0012] Further, the dischargeable state of the supercapacitor bank includes: the discharge SOC value of the supercapacitor bank is higher than the preset discharge SOC value of the supercapacitor bank, or the discharge power value of the supercapacitor bank is higher than the preset discharge power value of the supercapacitor bank;

[0013] The dischargeable state of the small power battery includes: the discharge SOC value of the small power battery is higher than the preset discharge SOC value of the small power battery, or the discharge power value of the small power battery is higher than the preset discharge power value of the small power battery.

[0014] Further, when the drive system is in a power request situation, the requested power value of the drive system is obtained;

[0015] If the requested power value is not higher than the preset power value, the control system controls the hydrogen fuel system to discharge.

[0016] Further, when the drive system is in a power recovery situation, the control system controls the small power battery and the supercapacitor bank to be preferentially charged.

[0017] Further, if the small power battery is in a chargeable state, the control system controls the small power battery to be charged;

[0018] If the small power battery is not in a chargeable state and the supercapacitor bank is in a chargeable state, the control system controls the small power battery to stop charging and the supercapacitor bank to be charged.

[0019] Further, if neither the small power battery nor the supercapacitor bank is in a chargeable state, the control system controls the small power battery and the supercapacitor bank to stop charging, and the braking resistor intervenes.

[0020] Further, the chargeable state of the small power battery includes: the charge SOC value of the small power battery is lower than the preset charge SOC value of the small power battery, or the charge power value of the small power battery is lower than the preset charge power value of the small power battery;

[0021] The rechargeable state of the supercapacitor bank includes: the charging SOC value of the supercapacitor bank is lower than the preset charging SOC value of the supercapacitor bank, or the charging power value of the supercapacitor bank is lower than the preset charging power value of the supercapacitor bank.

[0022] Further, if the hydrogen fuel system, the small power battery, and the supercapacitor bank are all in a fault state, the control system controls the hydrogen-electric hybrid system to power off.

[0023] The present application also discloses a hydrogen-electric hybrid system, including a hydrogen fuel system, a power battery system, a drive system, a main power supply line, and a control system. The hydrogen fuel system, the power battery system, and the drive system are all connected to the main power supply line. The control system is used to execute the control method of the hydrogen-electric hybrid system as described above.

[0024] Further, the hydrogen fuel system includes a hydrogen fuel cell stack and a hydrogen storage device for providing hydrogen fuel to the hydrogen fuel cell stack. The hydrogen storage device is provided with a hydrogen refueling port, and the small power battery is provided with a DC charging port and an AC charging port.

[0025] Further, the power battery system further includes an on-vehicle charger, and the on-vehicle charger is connected to the small power battery and the AC charging port.

[0026] Further, the hydrogen-electric hybrid system further includes a DCF module connected to the hydrogen fuel cell stack and the main power supply line. The DCF module is used to increase the output voltage of the hydrogen fuel cell stack.

[0027] Further, the power of the hydrogen fuel cell stack is less than 60 kW.

[0028] Further, the capacity of the small power battery is less than or equal to 20 kWh, and the power of the supercapacitor bank is greater than or equal to 100 kW.

[0029] The control method of the hydrogen-electric hybrid system and the hydrogen-electric hybrid system of the present application fully consider the switching of the hydrogen-electric hybrid system under different states and different demands according to the states of the small power battery and the supercapacitor bank and the power demand of the drive system, and can effectively control different modes and different working conditions, so as to ensure the stability and reliability of the operation of the hydrogen-electric hybrid system.

[0030] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit this specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings here are incorporated into the specification and form a part of this specification, showing embodiments consistent with this specification, and are used together with the specification to explain the principles of this specification.

[0032] Figure 1 It is a schematic connection diagram of the hydrogen-electric hybrid power system of this application.

[0033] Figure 2 It is a schematic flow diagram of the control method of the hydrogen-electric hybrid power system of this application.

[0034] Figure 3 It is a schematic flow diagram of the control method of the hydrogen-electric hybrid power system of this application under different conditions.

[0035] Figure 4 It is a schematic flow diagram of the control method of the hydrogen-electric hybrid power system of this application under starting and accelerating conditions.

[0036] Figure 5 It is a schematic flow diagram of the control method of the hydrogen-electric hybrid power system of this application under coasting and braking conditions.

[0037] Explanation of reference numerals in the drawings: 10, hydrogen fuel system; 11, hydrogen fuel cell stack; 12, hydrogen storage device; 121, hydrogen refueling port; 20, power battery system; 201, DC charging port; 202, AC charging port; 203, on-vehicle charger; 22, small power battery; 23, super capacitor bank; 30, drive system; 31, front electric drive; 32, rear electric drive; 40, main power supply line; 50, control system; 60, DFC module; 70, front wheel axle. Detailed implementation manners

[0038] Here, the exemplary embodiments will be described in detail, and the examples are shown in the accompanying drawings. When the following description refers to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementation manners described in the following exemplary embodiments do not represent all implementation manners consistent with this specification. On the contrary, they are merely examples of devices and methods consistent with some aspects of this specification as detailed in the appended claims.

[0039] The terms used in this application are for the purpose of describing specific embodiments only and are not intended to limit this application. Unless otherwise defined, the technical terms or scientific terms used in this specification should have the ordinary meanings as understood by those of ordinary skill in the art to which this application pertains. The terms "first", "second" and similar terms used in this specification and the claims do not denote any order, quantity or importance, but are only used to distinguish different components. Similarly, terms such as "a" or "an" do not denote a limitation of quantity, but rather denote the presence of at least one. "Plurality" or "several" means two or more. Unless otherwise indicated, terms such as "front", "rear", "lower" and / or "upper" are for convenience only and are not limited to one position or a spatial orientation. The terms "comprising" or "including" and similar terms are intended to mean that the elements or items appearing before "comprising" or "including" encompass the elements or items listed after "comprising" or "including" and their equivalents, and do not exclude other elements or items. The terms "connected" or "coupled" and similar terms are not limited to physical or mechanical connections, and may include electrical connections, whether direct or indirect.

[0040] The terms used in this specification are for the purpose of describing specific embodiments only and are not intended to limit this application. The singular forms "a", "the" and "said" used in this specification and the appended claims are also intended to include the plural forms unless the context clearly dictates otherwise. It should also be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0041] Next, the embodiments of this application will be described in detail.

[0042] This application provides a control method for a hydrogen-electric hybrid system. As Figure 1 shown, the hydrogen-electric hybrid system includes a hydrogen fuel system 10, a power battery system 20, a drive system 30, and a control system 50.

[0043] The hydrogen fuel system 10 is a chemical device that directly converts the chemical energy of hydrogen fuel into electrical energy and provides power for the operation of the hydrogen-electric hybrid system. The power battery system 20 can store and release electrical energy and is another main power source for the output power of the hydrogen-electric hybrid system. The drive system 30 is used to convert the electrical energy from the hydrogen fuel system 10 and the power battery system 20 into kinetic energy to drive the vehicle to run.

[0044] The power battery system 20 includes a small power battery 22 and a supercapacitor bank 23. The supercapacitor bank 23 has a high power density and a long service life, and can undertake the demand for instantaneous high power. The small power battery can be responsible for providing continuous energy supply and has good energy storage characteristics. The combination form of the small power battery 22 and the supercapacitor bank 23 can reduce the load of a single energy source, reduce the risk of single-point failure, and improve the stability and reliability of the operation of the power battery system 20.

[0045] As Figure 2 shown, the control method of the hydrogen-electric hybrid power system of the present application includes:

[0046] Step S100, obtaining a power-on request instruction of the hydrogen-electric hybrid power system.

[0047] Step S200, in response to the power-on request instruction, the control system 50 obtains the states of the small power battery 22 and the supercapacitor bank 23.

[0048] Specifically, the state of the small power battery 22 can be judged by the discharge SOC value, the charge SOC value, the discharge power value and the charge power value of the small power battery 22. The state of the supercapacitor bank 23 can be judged by the discharge SOC value, the charge SOC value, the discharge power value and the charge power value of the supercapacitor bank 23.

[0049] The SOC value represents the ratio of the remaining power of the battery or capacitor to the capacity of the battery or capacitor. The discharge SOC value represents the SOC value of the battery or capacitor in the discharge state. The charge SOC value represents the SOC value of the battery or capacitor in the charge state. For example: charging can be carried out when the SOC value is 10% - 95%, and discharging can be carried out when the SOC value is 95% - 10%. The discharge power refers to the rate of the energy that the battery or capacitor can output when releasing the stored energy, indicating the output speed of the energy during the discharge process. The charge power refers to the rate of the energy that the battery or capacitor can absorb when receiving charging, indicating the input speed of the energy during the charging process.

[0050] The control system 50 obtains the states of the small power battery 22 and the supercapacitor bank 23 through the BMS (Battery Management System). The charge and discharge SOC values and the charge and discharge power values of the battery or capacitor are detected and estimated in real time based on factors such as its voltage, current, and temperature.

[0051] Step S300, in response to the power-on request instruction, the control system 50 obtains the power condition of the drive system 30.

[0052] The power condition of the drive system 30 refers to the power level required to meet vehicle driving, which can be comprehensively calculated based on various factors such as vehicle weight, accelerator pedal travel, vehicle driving speed, and acceleration.

[0053] In this application, the power condition of the drive system 30 includes a power request condition and a power recovery condition. When the drive system 30 is in the power request condition, the drive system 30 needs to receive electrical energy from the hydrogen fuel system 10 and the power battery system 20. When the drive system 30 is in the power recovery condition, the drive system 30 can convert the kinetic energy from the wheels into electrical energy and charge the power battery system 20.

[0054] Step S400: The control system 50 supplies electrical energy to or recovers electrical energy from the drive system 30 according to the states of the small power battery 22 and the supercapacitor bank 23 and the power condition of the drive system 30.

[0055] Specifically, when the vehicle is in the starting or accelerating working conditions, the required power of the drive system 30 is relatively large. As Figure 3 shown, step S400 includes:

[0056] Step S410: When the drive system 30 is in the power request condition, obtain the requested power value of the drive system 30; if the requested power value is higher than the preset power value, the control system 50 controls the supercapacitor bank 23 to discharge preferentially.

[0057] At this time, if the supercapacitor bank 23 is in a dischargeable state, the control system 50 controls the supercapacitor bank 23 to discharge.

[0058] If the supercapacitor bank 23 is not in a dischargeable state and the small power battery 22 is in a dischargeable state, the control system 50 controls the supercapacitor bank 23 to stop discharging and the small power battery 22 to discharge.

[0059] If neither the supercapacitor bank 23 nor the small power battery 22 is in a dischargeable state, the control system 50 controls the supercapacitor bank 23 and the small power battery 22 to stop discharging, and the hydrogen fuel system 10 discharges.

[0060] Among them, determining whether the supercapacitor bank 23 and the small power battery 22 are in a dischargeable state includes: The control system 50 obtains the discharge SOC value and discharge power value of the supercapacitor bank 23 and compares them with the preset discharge SOC value and preset discharge power value. The control system 50 obtains the discharge SOC value and discharge power value of the small power battery 22 and compares them with the preset discharge SOC value and preset discharge power value.

[0061] The dischargeable state of the supercapacitor bank 23 includes: the discharge SOC value of the supercapacitor bank 23 is higher than the preset discharge SOC value of the supercapacitor bank 23, or the discharge power value of the supercapacitor bank 23 is higher than the preset discharge power value of the supercapacitor bank 23.

[0062] The dischargeable state of the small power battery 22 includes: the discharge SOC value of the small power battery 22 is higher than the preset discharge SOC value of the small power battery 22, or the discharge power value of the small power battery 22 is higher than the preset discharge power value of the small power battery 22.

[0063] Thus, as Figure 4 shown, when the vehicle is in the starting or accelerating working condition, the discharge control process of the hydrogen-electric hybrid power system of the present application is as follows:

[0064] Step S411: Obtain the discharge SOC value and the discharge power value of the supercapacitor bank 23.

[0065] Step S412: Determine whether the supercapacitor bank 23 is in a dischargeable state. If so, the supercapacitor bank 23 discharges, and step S411 is repeatedly executed; if not, the supercapacitor bank 23 stops discharging, and step S413 is executed.

[0066] Step S413: Obtain the discharge SOC value and the discharge power value of the small power battery 22.

[0067] Step S414: Determine whether the small power battery 22 is in a dischargeable state. If so, the small power battery 22 discharges, and step S413 is repeatedly executed; if not, the small power battery 22 stops discharging, and step S415 is executed.

[0068] Step S415: The hydrogen fuel system 10 discharges.

[0069] It can be seen that the discharge priority order of the hydrogen-electric hybrid power system of the present application during high-power output is "supercapacitor bank 23 - small power battery 22 - hydrogen fuel system 10", which can provide sufficient electric energy to make the drive system 30 rotate with instantaneous high torque, and solve the problem of insufficient power caused by the power output of the hydrogen fuel system 10 alone. At the same time, checking the state before the supercapacitor bank 23 and the small power battery 22 discharge can effectively avoid the problems of over-discharge and reduced service life caused by long-term high-power output.

[0070] When the vehicle is in the constant-speed driving working condition, the required power of the drive system 30 is small. As Figure 3 shown, step S400 further includes:

[0071] Step S420: When the drive system 30 is in a power request situation, obtain the requested power value of the drive system 30; if the requested power value is not higher than the preset power value, the control system 50 controls the hydrogen fuel system 10 to discharge.

[0072] When the vehicle is in a constant-speed low-power state, the hydrogen fuel system 10 is preferentially used to provide power for the drive system 30, giving full play to the advantages of the hydrogen fuel system 10 in the low-power state and improving the environmental friendliness, power generation efficiency, and endurance of the hydrogen-electric hybrid system.

[0073] When the vehicle is in a coasting or braking condition, the drive system 30 has a power recovery requirement, and the wheels drive the drive system 30 to be converted into a generator to charge the power battery system 20. As Figure 3 shown, step S400 further includes:

[0074] Step S430: When the drive system 30 is in a power recovery situation, the control system 50 controls the small power battery 22 and the supercapacitor bank 23 to be preferentially charged.

[0075] If the small power battery 22 is in a chargeable state, the control system 50 controls the small power battery 22 to be charged.

[0076] If the small power battery 22 is not in a chargeable state and the supercapacitor bank 23 is in a chargeable state, the control system 50 controls the small power battery 22 to stop charging and the supercapacitor bank 23 to be charged.

[0077] If neither the small power battery 22 nor the supercapacitor bank 23 is in a chargeable state, the control system 50 controls the small power battery 22 and the supercapacitor bank 23 to stop charging, and the braking resistor intervenes.

[0078] Among them, determining whether the supercapacitor bank 23 and the small power battery 22 are in a chargeable state includes: the control system 50 obtains the charging SOC value and charging power value of the supercapacitor bank 23 and compares them with the preset charging SOC value and preset charging power value. The control system 50 obtains the charging SOC value and charging power value of the small power battery 22 and compares them with the preset charging SOC value and preset charging power value.

[0079] The chargeable state of the small power battery 22 includes: the charging SOC value of the small power battery 22 is lower than the preset charging SOC value of the small power battery 22, or the charging power value of the small power battery 22 is lower than the preset charging power value of the small power battery 22.

[0080] The chargeable state of the supercapacitor bank 23 includes: the charging SOC value of the supercapacitor bank 23 is lower than the preset charging SOC value of the supercapacitor bank 23, or the charging power value of the supercapacitor bank 23 is lower than the preset charging power value of the supercapacitor bank 23.

[0081] Thus, as Figure 5 shown, when the vehicle is in the coasting or braking condition, the charging control process of the hydrogen-electric hybrid power system of the present application is as follows:

[0082] Step S431: Obtain the charging SOC value and charging power value of the small power battery 22.

[0083] Step S432: Determine whether the small power battery 22 is in a rechargeable state. If so, the small power battery 22 is charged, and step S431 is repeatedly executed; if not, the small power battery 22 stops charging, and step S432 is executed.

[0084] Step S433: Obtain the charging SOC value and charging power value of the super capacitor bank 23.

[0085] Step S434: Determine whether the super capacitor bank 23 is in a rechargeable state. If so, the super capacitor bank 23 is charged, and step S433 is repeatedly executed; if not, the super capacitor bank 23 stops charging, and step S435 is executed.

[0086] Step S435: The braking resistor intervenes.

[0087] The charging priority order of the hydrogen-electric hybrid power system of the present application under high-power recovery conditions is "small power battery 22 - super capacitor bank 23". Since the small power battery 22 has a relatively high energy density and is suitable for storing a large amount of braking energy. By first converting the braking energy into electrical energy and storing it in the small power battery 22, the braking energy can be recovered to the maximum extent, improving the energy utilization efficiency. Taking the super capacitor bank 23 as the charging object in the second stage can make more effective use of the power characteristics of the super capacitor bank 23 while avoiding its overcharging and damage.

[0088] In addition, when the vehicle brakes, problems such as sudden current changes and voltage fluctuations will occur during the recovery of braking energy. By first charging the small power battery 22, the changes in the charging current and voltage can be gently controlled, reducing the impact on the entire hydrogen-electric hybrid power system and improving the stability and reliability of the system.

[0089] As Figure 3 shown, step S400 further includes:

[0090] Step S440: Obtain the state of the hydrogen fuel system 10. If the hydrogen fuel system 10, the small power battery 22, and the super capacitor bank 23 are all in a fault state, the control system 50 controls the hydrogen-electric hybrid power system to power off.

[0091] The control method of the hydrogen-electric hybrid power system of the present application fully considers the switching of the hydrogen-electric hybrid power system under different states and different demands according to the states of the small power battery 22 and the supercapacitor bank 23 and the power demand of the drive system 30, and can perform effective control for different modes and different working conditions, ensuring the stability and reliability of the operation of the hydrogen-electric hybrid power system.

[0092] The present application also provides a hydrogen-electric hybrid power system, including a hydrogen fuel system 10, a power battery system 20, a drive system 30, a main power supply line 40, and a control system 50. The hydrogen fuel system 10, the power battery system 20, and the drive system 30 are all connected to the main power supply line 40, and the control system 50 is used to execute the control method of the hydrogen-electric hybrid power system as described above.

[0093] The hydrogen fuel system 10 includes a hydrogen fuel cell stack 11 and a hydrogen storage device 12. The hydrogen fuel cell stack 11 is connected in parallel to the main power supply line 40. An electrochemical reaction occurs in the hydrogen fuel cell stack 11 to generate electric energy, and the electric energy can be transmitted to other systems through the main power supply line 40. The hydrogen storage device 12 is connected to the hydrogen fuel cell stack 11 and provides hydrogen fuel for the hydrogen fuel cell stack 11. The hydrogen fuel cell stack 11 is located on one side of the power battery system 20, and the hydrogen storage device 12 is located on the other side of the power battery system 20.

[0094] The hydrogen fuel system 10 has excellent energy utilization rate and thermal efficiency, high overall energy utilization rate, and operates smoothly without noise, has strong low-temperature usability, and has little impact on air quality and the environment. It is one of the main power sources for the output power of the hydrogen-electric hybrid power system.

[0095] The hydrogen storage device 12 is provided with a hydrogen filling port 121, enabling the hydrogen-electric hybrid power system of the present application to have a hydrogen filling function. By providing the hydrogen filling port 121, the hydrogen-electric hybrid power system can more conveniently and efficiently obtain hydrogen energy from the outside and store it in the hydrogen storage device 12. The filling speed of hydrogen is relatively fast, enabling the hydrogen filling process to be completed quickly, improving the efficiency and convenience of user use.

[0096] Specifically, in the present application, the hydrogen storage device 12 is a hydrogen tank, which has a relatively high energy density. The number of hydrogen tanks is multiple, and they have a large storage capacity, which can fully meet the requirements of users for the cruising range. Moreover, by storing hydrogen dispersedly in multiple hydrogen tanks, the overall risk can be reduced, ensuring the safety and usability of the operation of the hydrogen-electric hybrid power system. In the present application, multiple hydrogen tanks are arranged side by side, making the overall structure more compact and reducing the complexity of pipeline connection. In some cases, multiple hydrogen tanks can also be dispersedly arranged according to the overall layout and space requirements to improve the flexibility of system design.

[0097] The power battery system 20 can store and release electrical energy and is another main power source for the output power of the hydrogen-electric hybrid system. In this application, the power battery system 20 is provided with a DC charging port 201 and an AC charging port 202, which can cooperate with external charging devices to supply electrical energy to the power battery system 20. The DC charging port 201 charges by directly transmitting current into the battery at a relatively high current, enabling fast charging of the power battery system 20, which is suitable for long-distance travel or urgent charging situations. The AC charging port 202 needs to convert alternating current into direct current before transmitting it into the battery, enabling slow charging of the power battery system 20, which is suitable for daily use or situations where the parking time is relatively long.

[0098] Specifically, the DC charging port 201 and the AC charging port 202 are arranged on the same side of the power battery system 20, and the hydrogen refueling port 121 is arranged on the side opposite to the DC charging port 201 and the AC charging port 202. Arranging the hydrogen refueling port 121 and the charging ports on both sides of the power battery system 20 can disperse the energy input, contribute to balancing the weight distribution of the hydrogen-electric hybrid system, and effectively improve the handling and stability. At the same time, users can more conveniently access charging devices or hydrogen refueling devices, improving the convenience and flexibility of use.

[0099] By providing the DC charging port 201 and the AC charging port 202, the hydrogen-electric hybrid system of this application has the fast charging and slow charging functions of the power battery system 20, meeting the diverse requirements for charging efficiency and charging devices in different usage scenarios. At the same time, the compatibility with energy replenishment devices is improved, enhancing the overall performance of the hydrogen-electric hybrid system.

[0100] It can be understood that in addition to being charged by connecting to external charging devices through the DC charging port 201 and the AC charging port 202, the power battery system 20 of this application can also be charged by receiving electrical energy from the hydrogen fuel system 10. This setting can ensure that when the hydrogen-electric hybrid system is in a situation where external charging cannot be carried out for a long time, the power battery system 20 can still operate normally and discharge externally through the charging of the hydrogen fuel system 10.

[0101] As Figure 1 shown, the power battery system 20 includes a small power battery 22, a supercapacitor bank 23, and an on-vehicle charger 203. The small power battery 22 and the supercapacitor bank 23 are respectively connected in parallel to the main power supply line 40. The DC charging port 201 is connected to the small power battery 22 to directly deliver direct current to the small power battery 22. The on-vehicle charger 203 is connected to the small power battery 22 and the AC charging port 202 to convert the alternating current from the AC charging port 202 into direct current and deliver it to the small power battery 22.

[0102] In this embodiment, the hydrogen fuel cell stack 11 has a relatively small volume and power, which is convenient for flexible arrangement in the hydrogen-electric hybrid system. While achieving lightweight design, it ensures a relatively high cruising range. The small power battery 22 has a relatively small volume and battery capacity, and cooperates with the supercapacitor bank 23 to meet the high-power output of the hydrogen-electric hybrid system, ensuring the performance requirements, and at the same time reducing the requirements for power following of the hydrogen fuel cell stack 11 and the small power battery 22.

[0103] Specifically, the power of the hydrogen fuel cell stack 11 is less than 60 kW, the capacity of the small power battery 22 is less than or equal to 20 kWh, and the power of the supercapacitor bank 23 is greater than or equal to 100 kW. The parameters of the hydrogen fuel cell stack 11, the small power battery 22, and the supercapacitor bank 23 can also be flexibly designed according to actual needs.

[0104] The drive system 30 includes at least one of the front electric drive 31 and the rear electric drive 32. The front electric drive 31 is arranged close to the hydrogen fuel cell stack 11 and is used to drive the front wheels. The rear electric drive 32 is arranged close to the hydrogen storage device 12 and is used to drive the rear wheels.

[0105] In this application, the control system 50 includes a fuel cell system controller and a vehicle controller. The fuel cell system controller is connected to the hydrogen fuel system 10 and is used to control the hydrogen fuel system 10. The vehicle controller is connected to the power battery system 20 and the drive system 30 and is used to control the power battery system 20 and the drive system 30. In some cases, the fuel cell system controller and the vehicle controller can also be integrated to reduce the development cost of components.

[0106] Furthermore, the hydrogen-electric hybrid system of this application further includes a DCF module 60. The DCF module 60 is connected to the hydrogen fuel cell stack 11 and the main power supply line 40. The hydrogen fuel cell stack 11 is boosted through the DCF module 60, and the DCF module 60 transmits the boosted electrical energy to the main power supply line 40. Specifically, the DCF module 60 is arranged below the hydrogen fuel cell stack 11.

[0107] The hydrogen-electric hybrid system of this application and the vehicle, by simultaneously setting the hydrogen fuel system 10 and the power battery system 20, enable the hydrogen-electric hybrid system to possess the advantages of both power systems, being able to achieve high-power output and having a relatively high cruising range. It can be driven purely electrically for short trips and can be hydrogen-increased for range during long-distance driving.

[0108] By providing a hydrogen refueling port 121 in the hydrogen storage device 12 and a DC charging port 201 and an AC charging port 202 in the power battery system 20, the hydrogen-electric hybrid system is enabled to have the functions of hydrogen refueling of the hydrogen fuel system 10, fast charging and slow charging of the power battery system 20, and at the same time, the compatibility with the energy replenishment equipment is improved to meet the different energy replenishment scenario requirements of users, and the stability and reliability of the operation of the hydrogen-electric hybrid system are improved. At the same time, through different combination forms of the power battery system 20, the requirements for the hydrogen fuel cell stack 11 can be reduced to meet the power following of the vehicle under different working conditions.

[0109] The above are only the preferred embodiments of the present application, and do not impose any form of limitation on the present application. Although the present application has been disclosed above in the preferred embodiments, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to the equivalent embodiments by using the disclosed technical content within the scope of the technical solution of the present application. However, as long as it does not depart from the content of the technical solution of the present application, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application still fall within the scope of the technical solution of the present application.

Claims

1. A control method for a hydrogen-electric hybrid power system, the hydrogen-electric hybrid power system comprising a hydrogen fuel system, a power battery system, a drive system, and a control system, wherein the power battery system comprises a small power battery and a supercapacitor bank; In response to a power-on request instruction, the control system controls the hydrogen fuel system, the small power battery, and the supercapacitor bank to supply electrical energy or recover electrical energy to the drive system by obtaining the states of the small power battery and the supercapacitor bank and the power condition of the drive system, and based on the states and the power condition.

2. The control method for a hydrogen-electric hybrid power system according to claim 1, wherein, When the drive system is in a power request situation, obtain the requested power value of the drive system; If the requested power value is higher than the preset power value, the control system controls the supercapacitor bank to discharge preferentially.

3. The control method for a hydrogen-electric hybrid power system according to claim 2, wherein, If the supercapacitor bank is in a dischargeable state, the control system controls the supercapacitor bank to discharge; If the supercapacitor bank is not in a dischargeable state and the small power battery is in a dischargeable state, the control system controls the supercapacitor bank to stop discharging and the small power battery to discharge.

4. The control method for a hydrogen-electric hybrid power system according to claim 2, wherein, If neither the supercapacitor bank nor the small power battery is in a dischargeable state, the control system controls the supercapacitor bank and the small power battery to stop discharging, and the hydrogen fuel system discharges.

5. The control method for a hydrogen-electric hybrid power system according to claim 2, wherein, The dischargeable state of the supercapacitor bank includes: the discharge SOC value of the supercapacitor bank is higher than the preset discharge SOC value of the supercapacitor bank, or the discharge power value of the supercapacitor bank is higher than the preset discharge power value of the supercapacitor bank; The dischargeable state of the small power battery includes: the discharge SOC value of the small power battery is higher than the preset discharge SOC value of the small power battery, or the discharge power value of the small power battery is higher than the preset discharge power value of the small power battery.

6. The control method for a hydrogen-electric hybrid power system according to claim 1, wherein, When the drive system is in a power request situation, obtain the requested power value of the drive system; If the requested power value is not higher than the preset power value, the control system controls the hydrogen fuel system to discharge.

7. The control method for a hydrogen-electric hybrid power system according to claim 1, wherein, When the drive system is in a power recovery situation, the control system controls the small power battery and the supercapacitor bank to charge preferentially.

8. The control method for a hydrogen-electric hybrid power system according to claim 7, wherein, If the small power battery is in a chargeable state, the control system controls the small power battery to charge; If the small power battery is not in a chargeable state and the supercapacitor bank is in a chargeable state, the control system controls the small power battery to stop charging and the supercapacitor bank to charge.

9. The control method for a hydrogen-electric hybrid power system according to claim 7, wherein, If neither the small power battery nor the supercapacitor bank is in a chargeable state, the control system controls the small power battery and the supercapacitor bank to stop charging, and the braking resistor intervenes.

10. The control method for a hydrogen-electric hybrid power system according to claim 7, wherein, The chargeable state of the small power battery includes: the charge SOC value of the small power battery is lower than the preset charge SOC value of the small power battery, or the charge power value of the small power battery is lower than the preset charge power value of the small power battery; The chargeable state of the supercapacitor bank includes: the charge SOC value of the supercapacitor bank is lower than the preset charge SOC value of the supercapacitor bank, or the charge power value of the supercapacitor bank is lower than the preset charge power value of the supercapacitor bank.

11. The control method for a hydrogen-electric hybrid power system according to claim 1, wherein, Obtain the state of the hydrogen fuel system. If the hydrogen fuel system, the small power battery and the supercapacitor bank are all in a fault state, the control system controls the hydrogen-electric hybrid system to power off.

12. A hydrogen-electric hybrid power system, wherein, It includes a hydrogen fuel system, a power battery system, a drive system, a main power supply line and a control system. The hydrogen fuel system, the power battery system and the drive system are all connected to the main power supply line. The control system is used to execute the control method of the hydrogen-electric hybrid system according to any one of claims 1-11.

13. The hydrogen-electric hybrid system according to claim 12, wherein The hydrogen fuel system includes a hydrogen fuel cell stack and a hydrogen storage device for supplying hydrogen fuel to the hydrogen fuel cell stack. The hydrogen storage device is provided with a hydrogen refueling port, and the small power battery is provided with a DC charging port and an AC charging port.

14. The hydrogen-electric hybrid system according to claim 13, wherein The power battery system further includes an on-vehicle charger, and the on-vehicle charger connects the small power battery to the AC charging port.

15. The hydrogen-electric hybrid system according to claim 13, wherein The hydrogen-electric hybrid system further includes a DCF module connecting the hydrogen fuel cell stack to the main power supply line, and the DCF module is used to boost the output voltage of the hydrogen fuel cell stack.

16. The hydrogen-electric hybrid system according to claim 13, wherein The power of the hydrogen fuel cell stack is less than 60 kW.

17. The hydrogen-electric hybrid system according to claim 12, wherein The capacity of the small power battery is less than or equal to 20 kWh, and the power of the supercapacitor bank is greater than or equal to 100 kW.

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