Hydrogen-electricity hybrid driving system and mine truck

Abstract

The invention provides a hydrogen-electricity hybrid driving system and a mine truck, and relates to the technical field of hybrid automobiles, the system comprises a traction converter, a hybrid battery system and a traction motor; the traction converter is connected between the hybrid battery system and the traction motor. The traction converter comprises an inverter and two direct current-direct current converters which are connected in parallel, and the two direct current-direct current converters are electrically connected with the traction motor through the inverter. The hybrid battery system comprises a hydrogen fuel battery system and a power battery system, and the hydrogen fuel battery system and the power battery system are correspondingly connected with the direct current-direct current converters respectively. The method has the effects that the reaction time during starting and braking of the hydrogen-electricity hybrid mine truck is shortened, and the control precision is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of hybrid vehicles, and in particular to a hydrogen-electric hybrid drive system and a mining vehicle. Background Art

[0002] At present, most of the global mining equipment, especially large open-pit mining trucks, still use diesel power systems, which have the disadvantages of high pollution and high fuel consumption. The electrification of large mining trucks has always been the direction of the industry's efforts. Due to the actual needs of large mining trucks for heavy loads, harsh working conditions and long-term operations, pure electric mining trucks cannot meet the use needs of large mining trucks due to their shortcomings such as short driving range, long charging time, large battery size and heavy weight. Therefore, various companies in the industry have actively invested in the research of hybrid drive mining vehicles. Hydrogen energy is recognized as the renewable energy with the highest energy value in the world. It has a large hydrogen energy reserve and is environmentally friendly and pollution-free. Hydrogen-electric hybrid is the main research direction of new energy mining vehicles.

[0003] However, the drive system used in existing hydrogen-electric mining vehicles usually places the traction motor and brake resistor with more connections in the center, and places the traction converter and power battery at the two ends of the traction motor and brake resistor respectively. As a result, the distance between the traction converter and the power battery is too long, and there is a problem of long reaction time during starting and braking. In addition, there is generally a problem of low hydrogen storage capacity, which requires frequent refueling. Summary of the invention

[0004] The problem solved by the present invention is how to shorten the reaction time of a hydrogen-electric hybrid mining vehicle during starting and braking and improve the control accuracy.

[0005] In order to solve the above problems, the present invention provides a hydrogen-electric hybrid drive system and a mining vehicle.

[0006] In a first aspect, the present invention provides a hydrogen-electric hybrid drive system, which adopts the following technical solution:

[0007] A hydrogen-electric hybrid drive system comprises a traction converter, a hybrid battery system and a traction motor; the traction converter is connected between the hybrid battery system and the traction motor;

[0008] The traction converter includes an inverter and two DC-DC converters connected in parallel, and the two DC-DC converters are electrically connected to the traction motor through the inverter;

[0009] The hybrid battery system includes a hydrogen fuel cell system and a power battery system, and the hydrogen fuel cell system and the power battery system are respectively connected to a corresponding DC-DC converter.

[0010] The beneficial effects of the present invention are: by changing the connection mode of the drive system, the traction inverter is set between the traction motor and the hybrid battery system, and the hydrogen fuel cell and the power battery are connected in series. First, the shortening of the physical distance shortens the connection path, thereby shortening the response time during driving and braking; second, the hydrogen fuel cell system and the power battery system are connected in parallel, so that the power battery system with high instantaneous power and fast dynamic response can be started as an auxiliary power source first, and in subsequent work, the hydrogen fuel cell system with high power and long endurance is used as the main power source for continuous and stable driving, thereby overcoming the defects of the hydrogen fuel cell system and the power battery system, and making the energy distribution during system operation more reasonable.

[0011] In addition, when the vehicle brakes, the braking energy is returned to the power battery system through the bidirectional DC / DC to charge the power battery system, thereby achieving energy recovery while satisfying electric braking.

[0012] Optionally, a hydrogen storage system is further included, and the hydrogen storage system is used to supply hydrogen to the hydrogen fuel cell system. The hydrogen storage system is provided with a plurality of gas transmission ports.

[0013] Optionally, the hydrogen fuel cell system includes a plurality of parallel-connected fuel cell stack modules, and the fuel cell stack modules are connected to gas delivery ports of the hydrogen storage system in a one-to-one correspondence.

[0014] Optionally, the hydrogen fuel cell system further includes a radiator, and a heat exchange pipeline is connected between the radiator and the fuel cell stack module.

[0015] Optionally, the hydrogen fuel cell system further includes a muffler, and the muffler is connected to the fuel cell stack module in a one-to-one correspondence.

[0016] Optionally, a hydraulic motor is further connected between the traction inverter and the traction motor.

[0017] Optionally, there are multiple traction motors.

[0018] In a second aspect, the present invention provides a hydrogen-electric hybrid drive mining vehicle, comprising a vehicle body and the hydrogen-electric hybrid drive system as described above.

[0019] Since the technical improvements and technical effects of the hydrogen-electric hybrid drive mining vehicle are the same as those of the hydrogen-electric hybrid drive system, the hydrogen-electric hybrid drive mining vehicle will not be described in detail.

[0020] Optionally, the hydrogen storage system includes a hydrogen cylinder and a bracket module, the gas delivery port is connected to the hydrogen cylinder, the bracket module is fixedly connected to the vehicle body, the bracket module is used to place the hydrogen cylinder, the bracket module includes a plurality of accommodating positions, and the hydrogen cylinders and the accommodating positions are arranged in a one-to-one correspondence.

[0021] Optionally, the vehicle body includes a drive axle, a front vehicle and a dump box, the front vehicle and the dump box are respectively arranged at the front and rear ends of the drive axle, the bracket module is fixedly installed between the front vehicle and the dump box, and the bracket module is detachably connected to the front vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a principle block diagram of a hydrogen-electric hybrid drive system according to an embodiment of the present invention.

[0023] Figure 2 This is a schematic diagram of the structure of a hydrogen-electric hybrid mining vehicle according to an embodiment of the present invention.

[0024] Description of reference numerals:

[0025] 1. Traction converter; 11. Inverter; 12. DC-DC converter; 2. Hydrogen fuel cell system; 21. Stack module; 22. Radiator; 23. Muffler; 24. Air filter; 3. Power battery system; 4. Traction motor; 5. Hydrogen storage system; 51. Hydrogen cylinder; 52. Bracket module; 521. Accommodation position; 6. Hydraulic motor; 7. Drive axle; 8. Front of the vehicle; 81. Cab; 82. Equipment platform; 9. Dump truck. DETAILED DESCRIPTION

[0026] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. Although certain embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be interpreted as being limited to the embodiments described herein. On the contrary, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the drawings and embodiments of the present invention are only for exemplary purposes and are not intended to limit the scope of protection of the present invention.

[0027] The term "including" and its variations used in this document are open inclusions, that is, "including but not limited to"; the term "based on" means "based at least in part on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment"; the term "some embodiments" means "at least some embodiments"; the term "optionally" means "optional embodiments". The relevant definitions of other terms will be given in the following description. It should be noted that the concepts of "first", "second", etc. mentioned in the present invention are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0028] It should be noted that the modifications of "one" and "plurality" mentioned in the present invention are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise clearly indicated in the context, it should be understood as "one or more".

[0029] In view of the problems existing in the above-mentioned related technologies, the present invention provides a hydrogen-electric hybrid drive system and a mining vehicle.

[0030] Reference Figure 1 A hydrogen-electric hybrid drive system provided in an embodiment of the present invention includes a traction inverter 1, a hybrid battery system and a traction motor 4; the traction inverter 1 is connected between the hybrid battery system and the traction motor 4; the traction inverter 1 includes an inverter 11 and two DC-DC converters 12 connected in parallel, and the two DC-DC converters 12 are electrically connected to the traction motor 4 through the inverter 11; the hybrid battery system includes a hydrogen fuel cell system 2 and a power battery system 3, and the hydrogen fuel cell system 2 and the power battery system 3 are respectively connected to one of the DC-DC converters 12.

[0031] Specifically, HVD in the figure represents a high-voltage distribution box, O2 represents oxygen, H2 represents hydrogen, w represents coolant, and e represents an electric box. The unmarked arrows in the figure represent the flow direction of electric energy. The power battery system 3 includes a plurality of electric boxes, which are first connected in series to form groups, and then connected in parallel to each other, and finally the electric energy is transmitted to the DC-DC converter 12 of the traction inverter 1 through the high-voltage distribution box.

[0032] This embodiment changes the connection mode of the drive system, connects the traction converter 1 between the traction motor 4 and the hybrid battery system, and connects the inverter 11 between the two DC-DC converters 12 and the traction motor 4, so that the connection path can be shortened, thereby shortening the response time during driving and braking; and, by connecting the hydrogen fuel cell system 2 and the power battery system 3 in parallel, the power battery system 3 with high instantaneous power and fast dynamic response can be started as an auxiliary power source first, and in subsequent work, the hydrogen fuel cell system 2 with high power and long endurance is used as the main power source for continuous and stable driving, thereby overcoming the respective defects of the hydrogen fuel cell system 2 and the power battery system 3, and making the energy distribution during system operation more reasonable.

[0033] Optionally, a hydrogen storage system 5 is further included, and the hydrogen storage system 5 is used to supply hydrogen to the hydrogen fuel cell system 2. The hydrogen storage system 5 is provided with a plurality of gas transmission ports.

[0034] Reference Figure 1Specifically, the hydrogen storage system 5 can be divided into multiple unit modules, a / b / c / d in the figure represent a unit module respectively, multiple unit modules are connected in parallel and connected to the gas transmission port respectively, and each unit module is controlled by an external control system to transmit gas separately in sequence, ensuring that only one unit module is operating in the same period. When one or several unit modules fail or hydrogen is exhausted, other unit modules can be switched in time to supply gas to the hydrogen fuel cell system 2. Moreover, the hydrogen storage system 5 can also replenish gas from the outside to the unit module that has exhausted hydrogen while transmitting gas to the outside.

[0035] Optionally, the hydrogen fuel cell system 2 includes a plurality of parallel-connected fuel cell stack modules 21 , and the fuel cell stack modules 21 are connected to the gas delivery ports of the hydrogen storage system 5 in a one-to-one correspondence.

[0036] Specifically, the stack module 21 is the core part of the hydrogen fuel cell. Hydrogen reacts with oxygen from the air to generate water and release electrical energy. Therefore, the hydrogen fuel cell system 2 also includes an air filter 24 for purifying oxygen in the air. The air filter 24 is set in a one-to-one correspondence with the stack module 21.

[0037] In this embodiment, four groups of battery stack modules 21 are provided. The electric energy generated by the battery stack modules 21 is transmitted to the DC-DC converter 12 of the traction inverter 1 through a high-voltage distribution box.

[0038] Reference Figure 1 Optionally, the hydrogen fuel cell system 2 further includes a radiator 22 , and a heat exchange pipeline is connected between the radiator 22 and the stack module 21 .

[0039] Specifically, a liquid-cooled radiator 22 is selected, and a heat exchange pipeline for circulating coolant is connected between the radiator 22 and the stack module 21 to improve the heat dissipation efficiency of the stack module 21 .

[0040] Optionally, the hydrogen fuel cell system 2 further includes a muffler 23 , and the muffler 23 is connected to the fuel cell stack module 21 in a one-to-one correspondence.

[0041] Specifically, the muffler 23 can effectively reduce noise, improve the working environment and comfort of the entire hydrogen fuel cell system 2, and alleviate the interference caused by sound wave vibration.

[0042] Optionally, a hydraulic motor 6 is further connected between the traction inverter 1 and the traction motor 4 .

[0043] Specifically, the hydraulic motor 6 can not only provide power support, but also participate in the conversion and recovery of energy, thereby improving efficiency, saving energy and reducing emissions.

[0044] Optionally, there are multiple traction motors 4.

[0045] Specifically, multiple traction motors 4 can increase horsepower and better meet the power requirements of mining vehicles.

[0046] In this embodiment, two traction motors 4 are provided.

[0047] An embodiment of the present invention provides a hydrogen-electric hybrid mining vehicle, comprising the hydrogen-electric hybrid drive system as described above.

[0048] The hydrogen-electric hybrid mining vehicle in this embodiment also includes a vehicle body, and the hydrogen-electric hybrid drive system converts electrical energy into mechanical energy to drive the vehicle body to move.

[0049] Reference Figure 2 Specifically, the vehicle body includes a drive axle 7, a front end 8 and a dump box 9, and the front end 8 and the dump box 9 are respectively arranged at the front and rear ends of the drive axle 7. The front end 8 further includes a cab 81 and an equipment platform 82. As can be seen from the figure, the cab 81 is located on the left side of the equipment platform 82, the traction inverter 1 and the power battery system 3 are placed on the right side of the equipment platform 82; the hydrogen fuel cell system 2 and the traction motor 4 are located at the bottom of the equipment platform 82. The traction motor 4 is located directly below the traction inverter 1, so that the length of the connection can be greatly shortened.

[0050] The beneficial effects of the hydrogen-electric hybrid drive mining vehicle of this embodiment relative to the prior art are the same as those of the above-mentioned hydrogen-electric hybrid drive system, which will not be described in detail here.

[0051] Optionally, the hydrogen storage system 5 includes a hydrogen cylinder 51 and a bracket module 52, the gas delivery port is connected to the hydrogen cylinder 51, the bracket module 52 is fixedly connected to the vehicle body, the bracket module 52 is used to place the hydrogen cylinder 51, the bracket module 52 includes a plurality of accommodating positions 521, and the hydrogen cylinders 51 and the accommodating positions 521 are arranged one-to-one.

[0052] Specifically, a plurality of accommodating positions 521 are arranged in layers along the height direction of the vehicle body. In this embodiment, the bracket module 52 includes two brackets of different specifications, the difference being the size and number of the accommodating positions 521. One of them is used to carry a hydrogen cylinder 51 with a capacity of 203L, and the other is used to carry a hydrogen cylinder 51 with a capacity of 62L. The combination of hydrogen cylinders 51 of different capacities and different numbers can more flexibly adapt to the endurance requirements of mining vehicles with different loading capacities.

[0053] Optionally, the support module 52 is fixedly installed between the vehicle head 8 and the dump box 9, and the support module 52 is detachably connected to the vehicle head 8.

[0054] Specifically, since the hydrogen storage system 5 is large in size and light in weight, an important reason why the existing hydrogen-electric hybrid mining vehicles have a short cruising time and low hydrogen reserves is that the volume occupied by the hydrogen cylinder 51 is too large, which interferes with the movement of the mining vehicle and the rotation of the dump box 9. In this embodiment, the bracket module 52 is installed between the front of the vehicle 8 and the dump box 9, so that the bracket module 52 and the hydrogen cylinder 51 are opposite to the flipping direction of the dump box 9. The width of the bracket module 52 does not exceed the width of the equipment platform 82. Even if the number of layers of the accommodating positions 521 continues to increase upward, it will not affect the normal driving of the mining vehicle and the rotation and unloading of the dump box 9, thereby solving the above-mentioned problem.

[0055] Although the present invention is disclosed as above, the protection scope of the present invention is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications will fall within the protection scope of the present invention.

Claims

1. A hydrogen-electric hybrid drive system, characterized in that: It comprises a traction converter (1), a hybrid battery system and a traction motor (4); the traction converter (1) is connected between the hybrid battery system and the traction motor (4); The traction converter (1) comprises an inverter (11) and two DC-DC converters (12) connected in parallel with each other, and the two DC-DC converters (12) are electrically connected to the traction motor (4) through the inverter (11); The hybrid battery system comprises a hydrogen fuel cell system (2) and a power battery system (3), wherein the hydrogen fuel cell system (2) and the power battery system (3) are respectively connected to a corresponding DC-DC converter (12).

2. The hydrogen-electric hybrid drive system according to claim 1, characterized in that: It also comprises a hydrogen storage system (5), wherein the hydrogen storage system (5) is used to supply hydrogen to the hydrogen fuel cell system (2), and the hydrogen storage system (5) is provided with a plurality of gas transmission ports.

3. The hydrogen-electric hybrid drive system according to claim 2, characterized in that: The hydrogen fuel cell system (2) comprises a plurality of parallel-connected fuel cell modules (21), and the fuel cell modules (21) are connected to the gas delivery ports of the hydrogen storage system (5) in a one-to-one correspondence.

4. The hydrogen-electric hybrid drive system according to claim 3, characterized in that: The hydrogen fuel cell system (2) further comprises a radiator (22), and a heat exchange pipeline is connected between the radiator (22) and the fuel cell module (21).

5. The hydrogen-electric hybrid drive system according to claim 3, characterized in that: The hydrogen fuel cell system (2) further comprises a muffler (23), and the muffler (23) is connected to the fuel cell stack module (21) in a one-to-one correspondence.

6. The hydrogen-electric hybrid drive system according to claim 1, characterized in that: A hydraulic motor (6) is also connected between the traction inverter (1) and the traction motor (4).

7. A hydrogen-electric hybrid mining vehicle, characterized in that: It comprises a vehicle body and the hydrogen-electric hybrid drive system according to any one of claims 2-6.

8. The hydrogen-electric hybrid mining vehicle according to claim 7, characterized in that: The hydrogen storage system (5) comprises a hydrogen bottle (51) and a bracket module (52), the gas delivery port is connected to the hydrogen bottle (51), the bracket module (52) is fixedly connected to the vehicle body, the bracket module (52) is used to place the hydrogen bottle (51), the bracket module (52) comprises a plurality of accommodating positions (521), and the hydrogen bottle (51) and the accommodating positions (521) are arranged in a one-to-one correspondence.

9. The hydrogen-electric hybrid mining vehicle according to claim 8, characterized in that: The vehicle body comprises a driving axle (7), a front vehicle (8) and a dump box (9); the front vehicle (8) and the dump box (9) are respectively arranged at the front and rear ends of the driving axle (7); the bracket module (52) is fixedly installed between the front vehicle (8) and the dump box (9), and the bracket module (52) and the front vehicle (8) are detachably connected.

10. The hydrogen-electric hybrid mining vehicle according to claim 9, characterized in that: The front of the vehicle (8) comprises a cab (81) and an equipment platform (82), wherein the cab (81) is located on one side of the equipment platform (82), the traction inverter (1) and the power battery system (3) are arranged on the equipment platform (82), the hydrogen fuel cell system (2) and the traction motor (4) are located at the bottom of the equipment platform (82), and the traction motor (4) is located directly below the traction inverter (1).

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