Hydrogen-electricity hybrid system and thermal management system thereof

Abstract

The utility model relates to the technical field of thermal management, and discloses a hydrogen-electricity hybrid system and a thermal management system.The hydrogen-electricity hybrid system comprises a hydrogen fuel system and an electric system, the hydrogen fuel system is connected with the electric system, and the hydrogen fuel system comprises a hydrogen reactor and a hydrogen reactor accessory connected with the hydrogen reactor; the heat management system comprises a gas-electricity heat exchange system and an electric heat exchange system. The gas-electricity heat exchange system is connected with the hydrogen reactor, the electric heat exchange system is connected with the hydrogen reactor accessory and the electric system, the gas-electricity heat exchange system is used for carrying out heat exchange on the hydrogen reactor, and the electric heat exchange system is used for carrying out heat exchange on the hydrogen reactor accessory and the electric heat exchange system. Therefore, heat exchange is independently carried out on the hydrogen reactor through the gas-electricity heat exchange system, accurate monitoring of the temperature of the hydrogen reactor is achieved, it is ensured that the hydrogen reactor works in the optimal temperature interval, and the electric energy output efficiency of the hydrogen reactor is improved. In addition, the hydrogen reactor accessories and the electric system share the electric heat exchange system, the service life of the hydrogen reactor accessories and the electric system is prolonged, and meanwhile the design complexity and cost of the heat management system are reduced.

Description

Technical Field

[0001] The present application relates to the field of thermal management technology, and in particular to a hydrogen-electric hybrid system and a thermal management system thereof. Background Art

[0002] With the shortage of non-renewable resources, hydrogen fuel has the advantages of light weight, high energy density, zero emission, no pollution, recyclability, and wide sources. Pure electric vehicles have problems such as range. Therefore, fuel cell vehicles have become one of the main development directions of new energy vehicles.

[0003] In the application of fuel cell vehicles, if the hydrogen fuel system is started in an environment, the power generation and efficiency of the hydrogen fuel system will decrease due to the low ambient temperature. Therefore, a thermal management system is required to heat the hydrogen fuel system so that the hydrogen fuel system works at the optimal temperature to ensure the power generation efficiency of the hydrogen fuel system. In addition, when the temperature of the components in the hydrogen fuel system is too high due to long-term operation, the power generation efficiency of the hydrogen fuel system will also be reduced, and there is a risk of damage to the components. At this time, a thermal management system is required to dissipate heat from the hydrogen fuel system.

[0004] It can be seen that how to perform thermal management on the hydrogen fuel system and the electric system, ensure the power generation efficiency of the hydrogen fuel system, and improve the service life of each component in the hydrogen fuel system is a crucial research direction for technical personnel in this field. Utility Model Content

[0005] In view of this, one aspect of the present application provides a thermal management system of a hydrogen-electric hybrid system, the hydrogen-electric hybrid system comprising: a hydrogen fuel system and an electric system, the hydrogen fuel system being connected to the electric system, the hydrogen fuel system comprising a hydrogen stack and a hydrogen stack accessory connected to the hydrogen stack, the thermal management system comprising a fuel-electric heat exchange system and an electric heat exchange system;

[0006] The fuel-electric heat exchange system is connected to the hydrogen stack, and the electric heat exchange system is connected to the hydrogen stack accessories and the electric system respectively; the fuel-electric heat exchange system is used to exchange heat with the hydrogen stack, and the electric heat exchange system is used to exchange heat with the hydrogen stack accessories and the electric heat exchange system.

[0007] Another aspect of the present application provides a hydrogen-electric hybrid system, the hydrogen-electric hybrid system comprising: a drive motor, a hydrogen fuel system, an electric system and a thermal management system of the hydrogen-electric hybrid system;

[0008] The hydrogen fuel system includes a hydrogen stack and a hydrogen stack accessory connected to the hydrogen stack;

[0009] The hydrogen fuel system is connected to the electric system, and the hydrogen fuel system is used to generate electrical energy through hydrogen and provide it to the electric system;

[0010] The electric system is connected to the driving motor to supply power to the driving motor.

[0011] The present application provides a hydrogen-electric hybrid system and its thermal management system, which can achieve accurate monitoring of the temperature of the hydrogen stack by exchanging heat with the fuel-electric heat exchange system alone, ensure that the hydrogen stack operates in the optimal temperature range, improve the efficiency of the hydrogen stack outputting electrical energy, and thus improve the reliability of vehicle thermal management. In addition, the hydrogen stack accessories and the electric system share the electric heat exchange system, so that each device operates in the optimal operating temperature range, which increases the service life of the hydrogen stack accessories and the electric system while reducing the complexity and cost of the thermal management system design. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 A schematic diagram of the structure of a hydrogen-electric hybrid system provided in an embodiment of the present application;

[0013] Figure 2 for Figure 1 A schematic diagram of the structure of the thermal management system of the hydrogen-electric hybrid system shown;

[0014] Figure 3 for Figure 1 A schematic diagram of an embodiment of a partial structure of a thermal management system of a hydrogen-electric hybrid system is shown;

[0015] Figure 4 for Figure 1 A schematic diagram of another embodiment of a partial structure of a thermal management system of a hydrogen-electric hybrid system is shown;

[0016] Figure 5 for Figure 2 A schematic diagram of the structure of the thermal management system of the hydrogen-electric hybrid system shown;

[0017] Figure 6 A schematic diagram of the structure of a controller provided in an embodiment of the present application.

[0018] The accompanying drawings are numbered as follows: hydrogen fuel system 1, electric system 2, controller 3, fuel-electric heat exchange system 4, electric heat exchange system 5, intercooler 6, monitoring equipment 7, drive motor 8, hydrogen stack 10, hydrogen stack accessories 11, heater 12, first water pump 13, first three-way valve 14, first radiator 15, particulate filter 16, exhaust device 17, kettle 18, motor 19, air compressor 20, air compressor controller 21, DC boost module 22, DC step-down module 23, second three-way valve 24, second water pump 25, second radiator 26, vehicle controller 29, fuel-electric controller 30, electric drive controller 31, power battery 32. DETAILED DESCRIPTION

[0019] Here, exemplary embodiments are described in detail, and examples thereof are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application.

[0020] The terms used in this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The singular forms of "a", "said" and "the" used in this application and the appended claims are also intended to include plural forms unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0021] It should be understood that although the terms first, second, third, etc. may be used in the present application to describe various information, these information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining".

[0022] At present, the development of hydrogen-electric hybrid vehicles is in a stage of rapid change and innovation. Hydrogen-electric hybrid vehicles combine the advantages of hydrogen fuel systems and electric systems to provide an efficient and environmentally friendly new energy solution. Specifically, the hydrogen fuel system converts hydrogen into electrical energy through chemical reactions, and the process only produces water vapor, achieving true zero emissions, while the battery system provides additional power or energy storage when needed. As a result, hydrogen-electric hybrid vehicles have become one of the main directions for the development of new energy vehicles in the future.

[0023] In the research and development of hydrogen-electric hybrid vehicles and the subsequent normal driving of vehicles, it is a crucial research direction to conduct thermal management of the vehicle, design a thermal management architecture, and achieve thermal management of the vehicle's hydrogen fuel system and electric system, thereby improving the safety of the vehicle.

[0024] To this end, an embodiment of the present application provides a vehicle thermal management system to achieve thermal management of a hydrogen fuel system and an electric system. Figure 1 A schematic diagram of the structure of a hydrogen-electric hybrid system provided in an embodiment of the present application is shown in FIG. Figure 1As shown, the hydrogen-electric hybrid system includes a hydrogen fuel system 1 and an electric system 2. The hydrogen fuel system 1 includes a hydrogen stack 10 and a hydrogen stack accessory 11. The hydrogen fuel system 1 is connected to the electric system 2. The hydrogen-electric hybrid system is used to power vehicles. Vehicles including the hydrogen-electric hybrid system include but are not limited to sedans, SUVs, MPVs, off-road vehicles, pickup trucks, or other non-track-borne vehicles driven by power. In addition, Figure 2 As shown, the hydrogen-electric hybrid system further includes a drive motor 8 , and both the electric system 2 and the hydrogen fuel system 1 are connected to the drive motor 8 to supply power to the drive motor 8 .

[0025] It can be understood that the hydrogen stack 10 in the hydrogen fuel system 1 is used to generate electric energy based on hydrogen and provide it to the electric system 2. The hydrogen stack accessories 11 include a water pump and an air compressor, etc. When the vehicle is started, the hydrogen stack accessories 11 are necessary devices for starting the hydrogen stack 10. Specifically, when the vehicle is started, the electric system 2 provides electric energy to the hydrogen stack accessories 11. At this time, the hydrogen stack accessories 11 work to help the hydrogen stack 10 start working to generate electric energy and transmit the electric energy to the electric system 2. When the vehicle is driving, the hydrogen fuel system 1 and the electric system 2 jointly provide electric energy for the vehicle.

[0026] Figure 2 for Figure 1 The schematic diagram of the thermal management system of the hydrogen-electric hybrid system is shown in FIG. Figure 2 As shown, the thermal management system includes: a fuel-electric heat exchange system 4 and an electric heat exchange system 5. The fuel-electric heat exchange system 4 is connected to the hydrogen stack 10 in the hydrogen fuel system 1 for thermal management of the hydrogen stack 10, while the electric heat exchange system 5 is respectively connected to the hydrogen stack accessory 11 and the electric system 2 for thermal management of the hydrogen stack accessory 11 and the electric system 2.

[0027] It is understandable that the hydrogen stack 10 is used to generate electricity from hydrogen. Heat is generated in the process of the hydrogen stack 10 generating electricity. After working for a period of time, the hydrogen stack 10 needs to be cooled. In addition, if the ambient temperature is low, the hydrogen stack 10 is difficult to start. At this time, the hydrogen stack 10 needs to be heated to assist the start of the hydrogen stack 10. In addition, the hydrogen stack accessories 11 and the hydrogen stack 10 system will also generate heat after working for a long time, which needs to be cooled. If the hydrogen stack 10, the hydrogen stack accessories 11 and the electric system 2 work for a long time without cooling, it will directly affect the service life of the device, and may even cause vehicle failures and safety issues.

[0028] like Figure 2As shown, the thermal management system also includes a controller 3, which is respectively connected to the fuel-electric heat exchange system 4 and the electric heat exchange system 5, and is used to control the fuel-electric heat exchange system 4 to perform heat exchange according to the temperature of the hydrogen stack 10 of the hydrogen stack 10, and control the electric heat exchange system 5 to perform heat exchange according to the temperature of the hydrogen stack accessory 11 of the hydrogen stack accessory 11 and the temperature of the electric system 2 of the electric system 2, wherein heat exchange includes heating and heat dissipation.

[0029] In a specific embodiment, a temperature sensor is required to collect the temperature of the hydrogen stack 10, the hydrogen stack accessories 11 and the electric system 2, and transmit the collected temperature to the controller 3, and the controller 3 sends a control signal to the fuel-electric heat exchange system 4 according to the temperature of the hydrogen stack 10, so that the fuel-electric heat exchange system 4 performs thermal management on the hydrogen stack 10. In addition, the controller 3 sends a control signal to the electric heat exchange system 5 according to the temperature of the hydrogen stack accessories 11 and the temperature of the electric system 2, so as to control the electric heat exchange system 5 to perform thermal management on the hydrogen stack accessories 11 and the electric system 2.

[0030] It should be noted that in order to improve the thermal management reliability and accuracy of the thermal management system, each thermal management part is provided with a temperature sensor, that is, the hydrogen stack 10, the hydrogen stack accessories 11 and the electric system 2 are provided with different temperature sensors for temperature collection. In addition, the hydrogen stack 10 is difficult to start normally in a low temperature environment, so an additional ambient temperature sensor is required to collect the ambient temperature. And each temperature sensor is connected to the controller 3.

[0031] Therefore, if Figure 2 As shown, the technical solution provided in the embodiment of the present application divides the thermal management system into three parts, that is, the first part is to realize heat exchange of the hydrogen stack 10 through the fuel-electric heat exchange system 4, the second part is to realize heat exchange of the hydrogen stack accessory 11 through the electric heat exchange system 5, and the third part is to realize heat exchange of the electric system 2 through the electric heat exchange system 5.

[0032] It is worth noting that the hydrogen stack accessories 11 include air compressors, water pumps, heaters, hydrogen supply systems and other devices necessary for starting the hydrogen stack 10. The electric system 2 includes power batteries, compressors, on-board chargers and other devices. The electric system 2 is used to store and release electrical energy. When the vehicle is started, the electrical energy is released to provide the hydrogen stack 10 and other devices. After the vehicle is started, the electric system 2 can be charged by connecting to an external charging device, or it can be charged by obtaining the power output by the hydrogen fuel system 1. During the driving process of the vehicle, when the motor needs energy for rapid acceleration, the hydrogen fuel system 1 and the electric system 2 output power together to ensure the power performance of the entire vehicle.

[0033] Therefore, the embodiment of the present application uses the fuel-electric heat exchange system 4 to independently exchange heat for the hydrogen stack 10, thereby achieving accurate monitoring of the hydrogen stack temperature, ensuring that the hydrogen stack 10 operates in the optimal temperature range, improving the efficiency of the hydrogen stack 10 in outputting electrical energy, and thus improving the reliability of vehicle thermal management. In addition, the hydrogen stack accessory 11 and the electric system 2 share the electric heat exchange system 5, so that each device operates in the optimal operating temperature range, improving the service life of the hydrogen stack accessory 11 and the electric system 2, while reducing the complexity and cost of the thermal management system design.

[0034] In an optional embodiment, Figure 3 for Figure 1 A schematic diagram of an embodiment of a partial structure of a thermal management system is shown, as Figure 3 As shown, the fuel-electric heat exchange system 4 includes: a heater 12, a first water pump 13, a first three-way valve 14 and a first radiator 15, wherein the first three-way valve 14 includes a first end, a second end and a third end.

[0035] like Figure 3 As shown, one end of the first water pump 13 is connected to the first end of the first three-way valve 14, and the heat exchange pipeline connecting the other end of the first water pump 13 and one end of the heater 12 passes through the hydrogen stack 10. The first water pump 13 is used to pump the coolant to the hydrogen stack 10. Therefore, when the heater 12 is heating, the first water pump 13 can drive the heated coolant to the hydrogen stack 10 to heat the hydrogen stack 10. Similarly, when the hydrogen stack 10 needs to dissipate heat, the first water pump 13 drives the coolant to the hydrogen stack 10, and the heater 12 is closed at this time.

[0036] like Figure 3 The second end of the first three-way valve 14 is connected to the first radiator 15, and the third end of the first three-way valve 14 is respectively connected to the first radiator 15 and one end of the heater 12, wherein the first radiator 15 also dissipates heat when the hydrogen stack 10 dissipates heat based on the coolant driven by the first water pump 13.

[0037] In a specific embodiment, the controller 3 is electrically connected to the heater 12 , the first water pump 13 and the first three-way valve 14 respectively, so as to control the working states of the heater 12 , the first water pump 13 and the first three-way valve 14 to achieve heat exchange for the hydrogen stack 10 .

[0038] Specifically, when the controller 3 determines that the temperature of the hydrogen stack 10 is greater than the first temperature threshold based on the temperature of the hydrogen stack 10 collected by the temperature sensor of the hydrogen stack 10, it is determined that the temperature of the hydrogen stack 10 is too high and the hydrogen stack 10 needs to be cooled. At this time, the controller 3 controls the heater 12 to be turned off, the first water pump 13 to be enabled, and the first end and the second end of the first three-way valve 14 to be connected. At this time, heat dissipation of the hydrogen stack 10 is achieved.

[0039] It should be noted that the first temperature threshold is set differently in the thermal management system of different vehicles, and can be 45 degrees Celsius or 50 degrees Celsius. This application does not limit this and can be set according to the needs of the actual vehicle. In addition, it should be noted that when the hydrogen stack 10 is cooled, the controller 3 will also control the first radiator 15 and will also operate to cooperate with the heat dissipation of the hydrogen stack 10.

[0040] When the controller 3 determines that the temperature of the hydrogen stack 10 is less than the second temperature threshold, it is determined that the current temperature of the hydrogen stack 10 is too low and cannot be started normally, or the efficiency of generating electricity is too low due to the low temperature of the hydrogen stack 10 (that is, the output power of the hydrogen stack 10 is too low). At this time, the hydrogen stack 10 needs to be heated to assist the start-up of the hydrogen stack 10 or to improve the efficiency of generating electricity by the hydrogen stack 10. When heating, specifically, the controller 3 needs to first determine the power generation power P1 of the hydrogen stack 10, the minimum working power P2 of the heater 12, and determine the current working power P3 of the heater 12 according to the current ambient temperature and power generation power.

[0041] Furthermore, if the generated power is greater than the minimum operating power (P1>P2), it indicates that the current output power of the hydrogen stack 10 is sufficient to support the operation of the heater 12, that is, the hydrogen stack 10 can provide the electric energy required for the operation of the heater 12. At this time, the controller 3 controls the heater 12 to heat at the current operating power P3, and controls the first end and the third end of the first three-way valve 14 to be connected, so as to heat the hydrogen stack 10.

[0042] If the power generation power is not greater than the minimum working power (P1≤P2), it indicates that the current output power of the hydrogen stack 10 is insufficient to support the operation of the heater 12, that is, the electric energy output by the hydrogen stack 10 is too low to support the operation of the heater 12. If the heater 12 is started at this time, a large amount of electric energy of the hydrogen stack 10 will be consumed, which will reduce the electric energy output of the hydrogen stack 10. At this time, the controller 3 controls the heater 12 and the first water pump 13 to be turned off, and controls the first end and the second end of the first three-way valve 14 to be turned on. It should be noted that turning off the heater 12 and the first water pump 13 stops the heating of the hydrogen stack 10, and the first end and the second end of the first three-way valve 14 are turned on, which is the default state of the first three-way valve 14, that is, the non-powered state.

[0043] Therefore, the thermal management system of the hydrogen-electric hybrid system provided in the present application controls the heater 12, the first water pump 13, the first three-way valve 14 and the first radiator 15 in the fuel-electric heat exchange system 4 through the controller 3 to achieve accurate heat exchange of the hydrogen stack 10. In addition, before heating, the working power of the hydrogen stack 10 and the minimum working power of the heater 12 are first determined. If the working power of the hydrogen stack 10 is greater than the minimum working power of the heater 12, heating is performed, otherwise, heating is not performed, thereby ensuring the output power of the hydrogen stack 10 while improving the service life of the hydrogen stack 10.

[0044] In an optional embodiment, Figure 4 for Figure 1 A schematic diagram of another embodiment of a partial structure of a thermal management system of a hydrogen-electric hybrid system is shown in FIG. Figure 4 As shown, the fuel-electric heat exchange system 4 also includes: an intercooler 6, a particulate filter 16, an exhaust device 17, a kettle 18 and a motor 19. The heat exchange pipeline connecting the other end of the first water pump 13 and the other end of the heater 12 passes through the intercooler 6, wherein the intercooler 6 is a gas radiator, which is mainly used to cool the air compressed by the supercharger.

[0045] like Figure 4 , the particle filter 16 is connected between the first water pump 13 and the first three-way valve 14. It is understandable that the temperature of the intercooler 6 will also rise after working for a long time. In order to further improve the reliability of the thermal management system, when the temperature of the intercooler 6 is too high, the intercooler 6 also needs to be cooled. Therefore, the intercooler 6 is set on the heat exchange pipeline connecting the first water pump 13 and the heater 12. In a specific embodiment, when the intercooler 6 is cooled, the controller 3 controls the heater 12 to be turned off and the first water pump 13 is enabled. At this time, the first water pump 13 drives the coolant to the intercooler 6 to cool the intercooler 6.

[0046] like Figure 4 As shown, one end of the exhaust device 17 is connected to the first end of the first three-way valve 14, the other end of the exhaust device 17 is connected to one end of the kettle 18, the other end of the kettle 18 is connected to one end of the motor 19, and the other end of the motor 19 is connected to the third end of the first three-way valve 14.

[0047] In a specific embodiment, Figure 4 As shown, the fuel-electric heat exchange system 4 includes multiple three-way valves, namely, three-way valve ECRV1, three-way valve ECRV2 and three-way valve ECRV3. When connecting various components in the fuel-electric heat exchange system 4, the heat exchange pipeline connecting the first end of the three-way valve ECRV1 and the first end of the three-way valve ECRV2 passes through the hydrogen stack 10, the third end of the three-way valve ECRV2 is connected to the heater 12, and the second end of the three-way valve ECRV2 is connected to the first end of the three-way valve ECRV3.

[0048] A second end of the three-way valve ECRV1 is connected to the first water pump 13 , a third end of the three-way valve ECRV1 is connected to the intercooler 6 , a third end of the three-way valve ECRV3 is connected to the motor 19 , and a second end of the three-way valve ECRV is connected to the first radiator 15 .

[0049] In an optional embodiment, if Figure 2 As shown, the thermal management system also includes a monitoring device 7, which is connected to the controller 3 and is used to collect the whole vehicle operation status of the vehicle; wherein the whole vehicle operation status is used to determine whether the vehicle fails.

[0050] In a specific embodiment, the vehicle may experience hydrogen leakage, high-voltage short circuit, hydrogen bottle overpressure, vehicle collision and other faults. If the hydrogen stack 10 is heated at this time, it will bring safety hazards. Therefore, in order to improve vehicle safety and reduce the risk factor, the monitoring device 7 transmits the collected data to the controller 3 in real time.

[0051] Furthermore, if the controller 3 determines that the vehicle fails according to the running state of the whole vehicle, the hydrogen stack 10 is controlled to stop outputting electric energy, the heater 12 and the first water pump 13 are controlled to be turned off, and the first end and the second end of the first three-way valve 14 are controlled to be connected. It can be understood that the first end and the second end of the first three-way valve 14 are connected as a default state, that is, a non-powered state, and the first end and the second end of the first three-way valve 14 are connected, and the heater 12 and the first water pump 13 are turned off, which can reduce the risk factor to a minimum.

[0052] It should be noted that the monitoring device 7 includes but is not limited to a voltage detection module, a pressure detection module, and a hydrogen detection module, among which the voltage detection module is used to detect a high voltage short circuit, the pressure detection module is used to detect the pressure of the hydrogen bottle, and the hydrogen detection module is used to detect whether hydrogen leaks. Of course, the monitoring device 7 may also include other devices for detecting vehicle accidents, which is not specifically limited in this application.

[0053] Figure 5 for Figure 2 The schematic diagram of the thermal management system of the hydrogen-electric hybrid system is shown in FIG. Figure 5 As shown, the hydrogen stack accessory 11 includes: an air compressor 20, an air compressor controller 21 and a DC boost module 22, wherein the air compressor controller 21 is used to control the operation of the air compressor 20, the DC boost module 22 is connected to the hydrogen stack 10, and the DC boost module 22 is used to boost the voltage output by the hydrogen stack 10.

[0054] The electric heat exchange system 5 is connected to the air compressor 20 , the DC boost module 22 and the air compressor controller 21 , and the electric heat exchange system 5 is used to exchange heat for the air compressor 20 , the DC boost module 22 and the air compressor controller 21 .

[0055] In addition, if Figure 5 As shown, the hydrogen stack accessory 11 also includes a DC step-down module 23. In specific real time, the DC step-down module 23 is connected to the DC boost module 22, and is used to step down the output voltage of the DC boost module 22 and provide it to the low-voltage accessories, wherein the low-voltage accessories include the first water pump 13 used in the fuel-electric heat exchange system 4, and a low-voltage battery, etc.

[0056] The first water pump 13 and other low-voltage accessories are connected to the output end of the DC step-down module 23. The DC step-down module 23 is used to step down the voltage output by the DC step-up module 22 and provide it to the first water pump 13 and other low-voltage accessories, that is, to supply power to the first water pump 13 and other low-voltage accessories. The electric heat exchange system 5 is connected to the DC step-down module 23, and the electric heat exchange system 5 is used to exchange heat for the DC step-down module 23.

[0057] In some optional embodiments, such as Figure 5 As shown, the electric heat exchange system 5 includes a second three-way valve 24, a second water pump 25 and a second radiator 26, wherein the second three-way valve 24 includes a fourth end, a fifth end and a sixth end.

[0058] The sixth end of the second three-way valve 24 is connected to the second water pump 25, and the heat exchange pipeline connecting the sixth end of the second three-way valve 24 and the second water pump 25 passes through the hydrogen stack accessory 11. The fifth end of the second three-way valve 24 is connected to the second radiator 26, and the heat exchange pipeline connecting the fourth end of the second three-way valve 24 and the second water pump 25 passes through the electric system 2.

[0059] In some optional embodiments, such as Figure 5 As shown, the electric heat exchange system 5 also includes a three-way valve ECRV4, a three-way valve ECRV5 and a three-way valve ECRV6. The heat exchange pipeline connecting the third end of the three-way valve ECRV4 and the sixth end of the second three-way valve 24 passes through the hydrogen stack accessory 11, that is, through the air compressor 20, the air compressor controller 21, the DC boost module 22 and the DC buck module 23.

[0060] The heat exchange pipeline connecting the second end of the three-way valve ECRV4 and the fourth end of the second three-way valve 24 passes through the electric system 2, the first end of the three-way valve ECRV4 is connected to the second water pump 25, the first end of the three-way valve ECRV5 is connected to the fifth end of the second three-way valve 24, the second end of the three-way valve ECRV5 is connected to the second heat exchanger, the third end of the three-way valve ECRV5 is connected to the third end of the three-way valve ECRV6, and the first end of the three-way valve ECRV6 is connected to the second radiator 26.

[0061] It should be noted that, in addition to Figure 5 In addition to the second three-way valve 24, the second water pump 25 and the second radiator 26 shown in the figure, the electric heat exchange system 5 in the embodiment of the present application also includes components such as a kettle. The present application does not specifically limit the structure of the electric heat exchange system 5. Figure 2 The specific structure of the electric heat exchange system 5 is not shown, however, other components of the electric heat exchange system 5 connect the electric system 2 and the hydrogen stack accessory 11 via interfaces N1-N5 so as to perform heat exchange between the hydrogen stack accessory 11 and the electric system 2.

[0062] In a specific embodiment, when the highest temperature among the temperatures of a plurality of hydrogen stack accessories 11 is greater than a third temperature threshold, it is determined that the hydrogen stack accessory 11 needs to dissipate heat. At this time, the controller 3 controls the second water pump 25 to be enabled, and controls the fourth and sixth ends of the second three-way valve 24 to be turned on at a target opening according to the temperature difference between the target temperature and the highest temperature, so that the electric heat exchange system 5 dissipates heat for the hydrogen stack accessory 11; wherein the target temperature is the optimal operating temperature of the hydrogen stack accessory 11 corresponding to the highest temperature.

[0063] It is understandable that since the hydrogen stack accessories 11 are all on the heat exchange pipeline connecting the sixth end of the second three-way valve 24 and the second water pump 25, when determining whether the hydrogen stack 10 needs to dissipate heat, it can be determined based on the hydrogen stack accessories 11 with the highest temperature among the hydrogen stack accessories 11, thereby avoiding any hydrogen stack accessory 11 from exceeding the optimal operating temperature and causing damage. In addition, it is also necessary to explain that the third temperature threshold is set differently according to the selection of different hydrogen stack accessories 11, and this application does not make specific limitations on this.

[0064] During implementation, when the fourth and sixth ends of the second three-way valve 24 are controlled to be conducted at the target opening, if the temperature difference is greater than the first preset value, the fourth and sixth ends of the second three-way valve 24 are controlled to be fully opened at the target opening. That is to say, if the temperature difference between the hydrogen stack accessory 11 and the optimal operating temperature is large, the hydrogen stack accessory 11 needs to be cooled as soon as possible to avoid damage to the hydrogen stack accessory 11, so the fourth and sixth ends of the second three-way valve 24 need to be opened relatively large.

[0065] If the temperature difference is less than or equal to the first preset value, the fourth end and the sixth end of the second three-way valve 24 are controlled to be turned on with the target opening being half of the opening. That is to say, when the temperature difference between the hydrogen stack accessory 11 and the optimal operating temperature is small, the hydrogen stack accessory 11 can be slowly cooled to avoid wasting resources, and at this time, the fourth end and the sixth end of the second three-way valve 24 are controlled to be opened at a small degree.

[0066] It should be noted that the embodiment of the present application does not specifically limit the correspondence between the temperature difference and the target opening, and multiple different temperature differences can be set to correspond to a target opening, thereby achieving more precise control of the heat exchange of the hydrogen stack accessory 11.

[0067] In an optional embodiment, the electric system 2 includes a power battery, a front motor 27 and an onboard charger 28, and the power battery is connected to the front motor 27 and the onboard charger 28 respectively to supply power to the front motor 27 and the onboard charger 28. Figure 5 As shown, the heat exchange pipeline connecting the fourth end of the second three-way valve and the second water pump passes through the front motor and the on-board charger.

[0068] The temperature of the electric system 2 includes the front motor temperature of the front motor 27 and the onboard charger temperature of the onboard charger 28. When the electric heat exchange system 5 exchanges heat for the electric system 2, if the larger temperature of the front motor temperature and the onboard charger temperature is greater than the fourth temperature threshold, the second water pump 25 is controlled to be enabled, and the fourth and fifth ends of the second three-way valve 24 are controlled to be connected, so that the electric heat exchange system 5 and the electric system 2 can dissipate heat.

[0069] It should be noted that when controlling the electric heat exchange system 5 to perform heat exchange on the electric system 2, the conductance opening of the fourth and fifth ends of the second three-way valve 24 can also be controlled according to the difference between the larger temperature of the front motor temperature and the on-board charger temperature in the electric system 2 and the optimal operating temperature of the corresponding device in the electric system 2. The specific method can be similar to the heat dissipation of the hydrogen stack accessory 11 in the above-mentioned embodiment, which will not be elaborated here.

[0070] Similarly, it should be noted that the fourth temperature threshold is set according to the selection of each component in the electric system 2, and this application also does not limit this.

[0071] It is worth noting that in the thermal management system provided in the embodiment of the present application, taking into account that the optimal temperature range of the hydrogen stack accessory 11 when working is different from that of the hydrogen stack 10, the heat exchange system of the hydrogen stack accessory 11 is separated from the heat exchange system of the hydrogen stack 10, that is, the hydrogen stack accessory 11 uses the electric heat exchange system 5 for heat exchange, and the hydrogen stack 10 uses the fuel-electric heat exchange system 4 for heat exchange, thereby avoiding the situation where the hydrogen stack 10 and the hydrogen stack accessory 11 use the same system, the hydrogen stack 10 needs to dissipate heat, while the hydrogen stack accessory 11 does not need to dissipate heat, but the hydrogen stack 10 and the hydrogen stack accessory 11 are cooled at the same time, which leads to waste of resources and reduces the working efficiency of the system.

[0072] Further, such as Figure 5 It can be seen that when the hydrogen stack accessory 11 and the electric system 2 share the electric heat exchange system 5, it is considered that the optimal operating temperature of the hydrogen stack accessory 11 is different from the optimal temperature of each component in the electric system 2. In addition, when the vehicle is started, the electric system 2 needs to be started first to provide electrical energy, and the hydrogen stack accessory 11 can only be started after the electric system 2 is started to provide electrical energy. Therefore, the working time of the hydrogen stack accessory 11 and the electric system 2 is not simultaneous.

[0073] Therefore, in order to avoid the above technical problems that may affect the working efficiency of each device, the embodiment of the present application designs the hydrogen stack accessory 11 and the electric system 2 in parallel, and realizes heat exchange of the hydrogen stack accessory 11 and the electric system 2 respectively by controlling different valves of the second three-way valve 24. In this way, it is ensured that each device works within a suitable temperature range, the service life of each device is improved, and the reliability of the vehicle's thermal management system is improved.

[0074] In an optional embodiment, Figure 6A schematic diagram of the structure of a controller provided in an embodiment of the present application is shown in FIG. Figure 6 As shown, the controller 3 includes a fuel-electric controller 30 and a vehicle controller 29. The vehicle controller 29 is connected to the fuel-electric controller 30 in a one-way communication manner, and specifically can be connected through a CAN bus. The fuel-electric controller 30 is used to receive an electrical signal from the vehicle controller 29. The fuel-electric controller 30 is connected to the hydrogen stack 10 in a communication manner. After receiving the control signal from the vehicle controller 29, the fuel-electric controller 30 controls the operation of the hydrogen stack 10 according to the electrical signal sent by the vehicle controller 29.

[0075] In a specific embodiment, when controlling the heat exchange of the fuel-electric heat exchange system 4, the vehicle controller 29 may send an electrical signal to the fuel-electric controller 30, and then the fuel-electric controller 30 controls the fuel-electric heat exchange system 4 to perform heat exchange according to the electrical signal of the vehicle controller 29. Alternatively, the fuel-electric controller 30 may directly send a control signal to control the fuel-electric heat exchange system 4 to perform heat exchange, thereby achieving heat exchange of the hydrogen stack 10.

[0076] It is understood that the fuel-electric controller 30 and the vehicle controller 29 are connected through the CAN bus. In addition to sending electrical signals to the fuel-electric controller 30 to control the hydrogen fuel system 1, the vehicle controller 29 can also send electrical signals to the electric system 2 to control the electric system 2. It is understood that the vehicle controller 29 is the core control unit of the vehicle, and exchanges information with node devices such as the vehicle's motor controller, wire-controlled steering system, and wire-controlled lighting system, and issues corresponding control instructions to achieve vehicle control by processing the received information.

[0077] In an optional embodiment, the hydrogen fuel system 1 is integrated into the power domain (electric system 2) in the form of a plug-in node without destroying the original architecture of the whole vehicle. In the form of a plug-in node, there is no need to modify the software of the controller in the power domain, wherein the controller in the power domain includes the whole vehicle controller, the controller of the battery management system, the DCF converter (DC Converter for Fuel Cell EV), and the OBC (On Board Charger) controller. The whole vehicle control device does not need to make any resource allocation for the hydrogen fuel system 1, nor does it need to interact with the hydrogen fuel system 1. The information required by the hydrogen fuel system 1 is received and logically processed by the fuel-electric controller 30. At the same time, the fuel-electric controller 30 will not send data to the power domain, and there is no impact on the existing power domain. Therefore, when the hydrogen-electric system is developed, under the condition of verifying the performance of the hydrogen fuel system 1, the hydrogen fuel system 1 can be installed in the existing power domain through the technical solution of the present application, reducing the modification of hardware and electrical topology, and reducing the workload of software development, thereby reducing development time and development costs.

[0078] In an optional embodiment, if Figure 6 As shown, the electric drive controller 31 is also connected to the vehicle controller, the electric drive controller 31 is connected to the power battery 32, and the electric drive controller 31 is connected to the fuel-electric controller 30 through a unidirectional communication via a CAN bus. The electric drive controller 31 is used to control the working state of the power battery 32 and to transmit electrical signals to the fuel-electric controller 30.

[0079] The fuel-electric controller 30 is used to receive the operating status of other vehicle systems (such as sensor systems, switch systems, and multimedia systems) sent by the vehicle controller 29, and is also used to receive the operating status (such as power) of the power battery 32 sent by the electric drive controller 31. The fuel-electric controller 30 does not send signals to the vehicle controller 29 and the electric drive controller 31, but only receives signals from the vehicle controller 29 and the electric drive controller 31, and controls the operation of the hydrogen stack 10 according to the received signals. In this way, the vehicle controller 29 does not directly control the hydrogen stack 10, and the electric drive controller 31 does not control the hydrogen stack 10. In the process of designing the fuel-electric controller 30, there is no need to change the existing control logic of the vehicle controller 29 and the electric drive controller 31.

[0080] It should be noted that, since the plug-in fuel-electric controller 30 cannot exchange information with the vehicle controller 29, when the air compressor 20, DC boost module 22, DC buck module 23 and air compressor controller 21 in the hydrogen fuel system 1 perform heat dissipation, the electric system 2 will heat up in a short time. After the vehicle controller 29 detects the heating state of the electric system 2, it will control the cooling fan in the first radiator 15 and the second water pump 25 to work, so that the hydrogen fuel system 1 and the electric system 2 can dissipate heat and cool down. Usually, the cooling fan in the first radiator 15 is controlled by the vehicle controller 29, and the appropriate calibration value can be adjusted upward according to the actual situation of the hydrogen fuel system 1.

[0081] In addition to being connected to the hydrogen stack 10 in the hydrogen fuel system 1, the fuel power controller 30 is also connected to the hydrogen stack accessories 11 such as the air compressor 20, the DC boost module 22, the DC buck module 23 and the air compressor controller 21, that is, connected via the CAN bus. During implementation, the operating status of each device in the hydrogen fuel system 1 is identified as the input condition of the logic function, and the operating status of each device is controlled to adjust according to the result of the logic operation.

[0082] Specifically, the fuel-electric controller 30 identifies the vehicle's operating status, energy status, and working status of the hydrogen fuel system 1 , and controls the start / stop status, thermal management requirements, power generation requirements, and other functions of the hydrogen fuel system 1 according to the identification results.

[0083] Correspondingly, the signals that the fuel-electric controller 30 needs to obtain include but are not limited to the vehicle speed, the voltage of the drive motor, the high-voltage relay status, the working mode of the drive motor, the electric drive coolant flow, the high-voltage battery pack voltage, the high-voltage battery pack current, the driving mileage, the high-voltage battery pack allowable charging power and the high-voltage battery pack allowable discharging power.

[0084] In the above embodiments, the thermal management system of the hydrogen-electric hybrid system is described in detail, and the present application also provides an embodiment corresponding to the hydrogen-electric hybrid system. The vehicle comprises: a drive motor, a hydrogen fuel system, an electric system and the thermal management system of the hydrogen-electric hybrid system described in any of the above embodiments.

[0085] Among them, the hydrogen fuel system includes a hydrogen stack and hydrogen stack accessories connected to the hydrogen stack. The hydrogen fuel system is connected to the electric system. The hydrogen fuel system is used to generate electricity through hydrogen and provide it to the electric system. The electric system is connected to the drive motor to power the drive motor.

[0086] Since the hydrogen-electric hybrid system in the embodiment of the present application includes the thermal management system of the hydrogen-electric hybrid system described in the above embodiment, the beneficial effects produced can be found in the description of the above embodiment and will not be repeated here.

[0087] It should be noted that the various features described in a single embodiment may also be implemented separately in multiple embodiments or in any suitable sub-combination. In addition, although features may function in certain combinations as described above and even initially claimed as such, one or more features from the claimed combination may be removed from the combination in some cases, and the claimed combination may be directed to a sub-combination or a variation of the sub-combination.

[0088] In addition, the separation of various system modules and components in the above-mentioned embodiments should not be understood as requiring such separation in all embodiments, and it should be understood that the described program components and systems can generally be integrated together in a single software product, or packaged into multiple software products.

[0089] Thus, specific embodiments of the subject matter have been described. Other embodiments are within the scope of the appended claims. In some cases, the actions recited in the claims can be performed in a different order and still achieve the desired results. In addition, the processes depicted in the drawings do not necessarily require the particular order or sequential order shown to achieve the desired results. In some implementations, multitasking and parallel processing may be advantageous.

[0090] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A thermal management system for a hydrogen-electric hybrid system, characterized in that: The hydrogen-electric hybrid system comprises: a hydrogen fuel system and an electric system, wherein the hydrogen fuel system is connected to the electric system, the hydrogen fuel system comprises a hydrogen stack and hydrogen stack accessories connected to the hydrogen stack, and the thermal management system comprises a fuel-electric heat exchange system and an electric heat exchange system; The fuel-electric heat exchange system is connected to the hydrogen stack, and the electric heat exchange system is connected to the hydrogen stack accessories and the electric system respectively; the fuel-electric heat exchange system is used to exchange heat with the hydrogen stack, and the electric heat exchange system is used to exchange heat with the hydrogen stack accessories and the electric heat exchange system.

2. The thermal management system of the hydrogen-electric hybrid system according to claim 1, characterized in that: The fuel-electric heat exchange system comprises: a heater, a first water pump, a first three-way valve and a first radiator; wherein the first three-way valve comprises a first end, a second end and a third end; One end of the first water pump is connected to the first end of the first three-way valve, and a heat exchange pipeline connecting the other end of the first water pump and one end of the heater passes through the hydrogen stack, and the first water pump is used to pump coolant to the hydrogen stack; The second end of the first three-way valve is connected to the first radiator, and the third end of the first three-way valve is connected to one end of the first radiator and the heater respectively.

3. The thermal management system of the hydrogen-electric hybrid system according to claim 2, characterized in that: The fuel-electric heat exchange system also includes: an intercooler, a particulate filter, an exhaust device, a kettle and a motor; A heat exchange pipeline connecting the other end of the first water pump and the other end of the heater passes through the intercooler, and the particle filter is connected between the first water pump and the first three-way valve; One end of the exhaust device is connected to the first end of the first three-way valve, the other end of the exhaust device is connected to one end of the kettle, the other end of the kettle is connected to one end of the motor, and the other end of the motor is connected to the third end of the first three-way valve.

4. The thermal management system of the hydrogen-electric hybrid system according to claim 2, characterized in that: The thermal management system also includes a monitoring device and a controller; The monitoring device is connected to the controller, and the monitoring device is used to collect the whole vehicle operation status of the vehicle. The controller is used to control the hydrogen stack, the heater, the first water pump and the first three-way valve according to the whole vehicle operation status.

5. The thermal management system of the hydrogen-electric hybrid system according to claim 1, characterized in that: The hydrogen stack accessories include: an air compressor, an air compressor controller for controlling the air compressor, and a DC boost module; The DC boost module is connected to the hydrogen stack, and the DC boost module is used to boost the voltage output by the hydrogen stack; The electric heat exchange system is connected to the air compressor, the DC boost module and the air compressor controller respectively, and the electric heat exchange system is used to exchange heat for the air compressor, the DC boost module and the air compressor controller.

6. The thermal management system of the hydrogen-electric hybrid system according to claim 5, characterized in that: The hydrogen stack accessory further includes a DC step-down module connected to the DC step-up module, and the fuel-electric heat exchange system includes a first water pump; The first water pump is connected to the output end of the DC step-down module, and the DC step-down module is used to step down the voltage output by the DC step-up module and then provide it to the first water pump; The electric heat exchange system is connected to the DC step-down module, and the electric heat exchange system is used to exchange heat for the DC step-down module.

7. The thermal management system of the hydrogen-electric hybrid system according to claim 6, characterized in that: The electric heat exchange system comprises a second three-way valve, a second water pump and a second radiator; wherein the second three-way valve comprises a fourth end, a fifth end and a sixth end; The sixth end of the second three-way valve is connected to the second water pump, and the heat exchange pipeline connecting the sixth end of the second three-way valve and the second water pump passes through the hydrogen stack accessory. The fifth end of the second three-way valve is connected to the second radiator, and the heat exchange pipeline connecting the fourth end of the second three-way valve and the second water pump passes through the electric system.

8. The thermal management system of the hydrogen-electric hybrid system according to claim 7, characterized in that: The electric system includes a power battery, a front motor and an on-board charger; The power battery is connected to the front motor and the on-board charger respectively, and is used to supply power to the front motor and the on-board charger; The heat exchange pipeline connecting the fourth end of the second three-way valve and the second water pump passes through the front motor and the on-board charger.

9. The thermal management system of a hydrogen-electric hybrid system according to any one of claims 1 to 8, characterized in that: The thermal management system includes a controller, which is connected to the fuel-electric heat exchange system and the electric heat exchange system and is used to control the fuel-electric heat exchange system and the electric heat exchange system; The controller includes a fuel-electric controller and a vehicle controller; The vehicle controller is in one-way communication connection with the fuel-electric controller, and the fuel-electric controller is used to receive the electrical signal of the vehicle controller; The fuel-electric controller is in communication connection with the hydrogen stack, and is used to control the operation of the hydrogen stack according to the electrical signal sent by the vehicle controller.

10. A hydrogen-electric hybrid system, characterized in that: The hydrogen-electric hybrid system comprises: a drive motor, a hydrogen fuel system, an electric system and a thermal management system of the hydrogen-electric hybrid system according to any one of claims 1 to 9; The hydrogen fuel system includes a hydrogen stack and a hydrogen stack accessory connected to the hydrogen stack; The hydrogen fuel system is connected to the electric system, and the hydrogen fuel system is used to generate electrical energy through hydrogen and provide it to the electric system; The electric system is connected to the driving motor to supply power to the driving motor.

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