Hybrid power source system, vehicle, control method, and electronic device

Abstract

The application discloses a hybrid power source system, a vehicle, a control method and electronic equipment. The hybrid power source system comprises a fuel cell system, a power battery, a voltage conversion module and a discharging module. The fuel cell system comprises a fuel cell stack. An input end of the voltage conversion module is connected with the fuel cell stack. An output end of the voltage conversion module is connected with a direct current bus. The discharging module is used for starting discharging to absorb at least part of energy generated by the fuel cell stack in a shutdown purging stage in response to a fuel cell system shutdown purging instruction when the vehicle meets a fuel cell system shutdown trigger condition and the chargeable capacity of the power battery is less than a preset capacity threshold. The system can absorb part or all of the energy generated by the fuel cell stack in the shutdown purging stage through the discharging module, prevent the fuel cell stack from overcharging the power battery in the shutdown purging stage, avoid accidents caused by overcharging of the power battery, and improve reliability and safety.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of vehicles, in particular to a hybrid power source system, and a vehicle, a vehicle control method and an electronic device. BACKGROUND

[0002] In the related art, when a fuel cell vehicle is in a shutdown state, the fuel cell system needs to be shut down for purging to reduce the residual liquid water inside the fuel cell stack to avoid water icing to cause blockage in a low temperature environment, affecting the performance and service life of the fuel cell stack. Therefore, the fuel cell system does not immediately stop the output of electric power to the outside, and during this shutdown period, if there is no other device in the vehicle consuming the output power of the fuel cell system, the electric power can only be passively received by the power battery, and at this time, the allowable power recovery of the power battery is at a low level, thus there is a risk of overcharging the power battery, which can cause damage to the power battery and drive system failure, leading to safety accidents. SUMMARY

[0003] The present application aims to at least solve one of the technical problems in the prior art. To this end, one object of the present application is to provide a hybrid power source system that can absorb part or all of the energy generated by the fuel cell stack during the shutdown purging stage through a discharging module, prevent overcharging of the power battery by the fuel cell stack during the shutdown purging stage, avoid accidents caused by overcharging of the power battery, and improve reliability and safety.

[0004] A second object of the present application is to provide a vehicle.

[0005] A third object of the present application is to provide a vehicle control method.

[0006] A fourth object of the present application is to provide an electronic device.

[0007] To solve the above problems, the first aspect of the present application provides a hybrid power source system, comprising: a fuel cell system, the fuel cell system comprising a fuel cell stack; a power battery, the power battery being connected to a direct current bus; a voltage conversion module, an input end of the voltage conversion module being connected to the fuel cell stack, an output end of the voltage conversion module being connected to the direct current bus, the voltage conversion module being used to convert the output voltage of the fuel cell stack and transmit the converted voltage to the direct current bus; a discharging module, the discharging module being connected to the output end of the voltage conversion module and being connected in parallel with the power battery, the discharging module being used to start discharging to absorb at least part of the energy generated by the fuel cell stack during the shutdown purging stage in response to a fuel cell system shutdown purging instruction when the vehicle meets a fuel cell system shutdown triggering condition and the chargeable capacity of the power battery is less than a preset capacity threshold.

[0008] According to the hybrid power source system, when the fuel cell system is shut down and purged, the energy discharged from the fuel cell stack is first transmitted to the discharging module, and the discharging module absorbs part or all of the energy generated by the fuel cell stack during the shut down and purging stage, so as to prevent the fuel cell stack from overcharging the power battery during the shut down and purging stage, avoid accidents caused by overcharging of the power battery, and improve reliability and safety.

[0009] In some embodiments, the direct current bus includes a positive direct current bus and a negative direct current bus, a first end of the positive direct current bus and a first end of the negative direct current bus are connected to the output end of the voltage conversion module; the discharging module includes a discharging unit and a first switch unit connected in series, a first end of the discharging unit and the first switch unit connected in series is connected to the positive direct current bus, and a second end of the discharging unit and the first switch unit connected in series is connected to the negative direct current bus; the first switch unit is configured to be closed in response to the fuel cell system shut down and purging instruction, and the discharging unit is configured to discharge when the first switch unit is in a closed state.

[0010] In some embodiments, the hybrid power source system further includes a power distribution module, an input end of the power distribution module is connected to the output end of the voltage conversion module, the discharging module through the positive direct current bus and the negative direct current bus, a first output end of the power distribution module is connected to the power battery, and the power distribution module is configured to distribute output energy of the fuel cell stack and / or the power battery according to a vehicle operating state; a second switch unit is arranged on the positive direct current bus, a first end of the second switch unit is connected to the output end of the voltage conversion module and the discharging module, and a second end of the second switch unit is connected to an input end of the power distribution module, and the second switch unit is configured to be opened in response to the end of the shut down and purging stage instruction or in response to the fuel cell system shut down and purging instruction.

[0011] In some embodiments, the fuel cell system further includes a fuel cell system controller connected to the first switch unit and the second switch unit, and configured to control switching states of the first switch unit and the second switch unit according to the fuel cell system shut down and purging instruction or according to a fuel cell system shut down and purging state.

[0012] The second aspect of the present application provides a vehicle, comprising: the hybrid power source system described in the above embodiments; a drive system, the drive system comprising a motor controller and a drive motor, the motor controller being connected with the power distribution module of the hybrid power source system and the drive motor; and a vehicle controller, the vehicle controller being connected with the hybrid power source system and configured to send a fuel cell system shutdown purge instruction to the hybrid power source system when the vehicle meets a fuel cell system shutdown trigger condition.

[0013] According to the vehicle of the present application, when the vehicle meets the fuel cell system shutdown trigger condition, the vehicle controller sends a fuel cell system shutdown purge instruction to the hybrid power source system, and the fuel cell system is purged. When the fuel cell system is purged, the energy discharged from the fuel cell stack is transmitted to the discharge module, and the discharge module absorbs part or all of the energy generated by the fuel cell stack during the shutdown purge stage, thereby preventing the fuel cell stack from overcharging the power battery during the shutdown purge stage, avoiding accidents caused by overcharging of the power battery, and improving reliability and safety.

[0014] The third aspect of the present application provides a vehicle control method, which is used for the hybrid power source system described in the above embodiments. The vehicle control method comprises: determining that the vehicle meets a fuel cell system shutdown trigger condition and the chargeable capacity of the power battery is less than a preset capacity threshold, wherein the fuel cell system shutdown trigger condition comprises that the state of charge of the power battery reaches a charge threshold or the allowable charging power of the power battery is less than the lower limit of the working power of the fuel cell stack; and in response to a fuel cell system shutdown purge instruction, controlling the discharge module of the hybrid power source system to start discharging to absorb at least part of the energy generated by the fuel cell stack during the shutdown purge stage.

[0015] According to the vehicle control method of the present application, when the vehicle meets the fuel cell system shutdown trigger condition, the hybrid power source system receives a fuel cell system shutdown purge instruction, and then the hybrid power source system controls the fuel cell system to be purged. When the fuel cell system is purged, the energy discharged from the fuel cell stack is transmitted to the discharge module, and the discharge module absorbs part or all of the energy generated by the fuel cell stack during the shutdown purge stage, thereby preventing the fuel cell stack from overcharging the power battery during the shutdown purge stage, avoiding accidents caused by overcharging of the power battery, and improving reliability and safety.

[0016] In some embodiments, the vehicle control method further comprises: when the vehicle is in the normal driving state, controlling a first switch unit in the hybrid power source system to be in an open state, and controlling a second switch unit in the hybrid power source system to be in a closed state; wherein the first switch unit is located between a discharging unit in the discharging module and an output end of a voltage conversion module in the hybrid power source system, and the second switch unit is connected between the output end of the voltage conversion module and a power distribution module in the hybrid power source system.

[0017] In some embodiments, in response to the fuel cell system shutdown purging instruction, the discharging module of the hybrid power source system is controlled to start discharging, comprising: in response to the fuel cell system shutdown purging instruction, the first switch unit of the discharging module is controlled to be closed.

[0018] In some embodiments, the vehicle control method further comprises: determining that the shutdown purging phase of the fuel cell system ends, controlling the first switch unit to be opened, and controlling the second switch unit to be opened.

[0019] An embodiment of the fourth aspect of the present application provides an electronic device, comprising: at least one processor; a memory communicatively connected with the at least one processor; the memory has a computer program which can be executed by the at least one processor, and the at least one processor implements the vehicle control method of the above-mentioned embodiments when executing the computer program.

[0020] The electronic device according to the embodiment of the present application can store the corresponding vehicle control program in the memory, and when the vehicle control method is implemented, it is determined that the vehicle meets the fuel cell system shutdown triggering condition, the hybrid power source system receives the fuel cell system shutdown purging instruction, and the hybrid power source system controls the fuel cell system to perform shutdown purging. When the fuel cell system is shutdown and purged, the energy discharged from the fuel cell stack is transmitted to the discharging module, part or all of the energy generated by the fuel cell stack in the shutdown purging phase is absorbed through the discharging module, the overcharging of the power battery by the fuel cell stack in the shutdown purging phase is prevented, the accident caused by overcharging of the power battery is avoided, and the reliability and safety are improved.

[0021] Additional aspects and advantages of the present application will be made apparent from the following description, which, taken together with the accompanying drawings, describes an embodiment of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0022] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description, taken together with the accompanying drawings, in which:

[0023] Figure 1 is a schematic diagram of the architecture of a hybrid power source system and a drive system according to an embodiment of the present application;

[0024] Figure 2 is a structural block diagram of a fuel cell system according to an embodiment of the present application;

[0025] Figure 3 is a structural block diagram of a vehicle according to an embodiment of the present application;

[0026] Figure 4 is a flow chart of a vehicle control method according to an embodiment of the present application;

[0027] Figure 5 is a structural block diagram of an electronic device according to an embodiment of the present application.

[0028] Reference Signs:

[0029] Vehicle 200; Electronic device 300;

[0030] Hybrid power source system 100; Drive system 400; Vehicle controller 201; Processor 301; Memory 302;

[0031] Fuel cell system 110; Fuel cell stack 111; Fuel cell auxiliary module 112; Fuel cell system controller 113; Power battery 120; Voltage conversion module 130; Discharge module 140; First switch unit 141; Discharge unit 142; Power distribution module 150; Second switch unit 101; Motor system 160. DETAILED DESCRIPTION

[0032] Embodiments of the present application are described in detail below with reference to the accompanying drawings. Embodiments of the present application are described in detail below.

[0033] In the prior art, fuel cell hybrid power system topologies mainly include: fuel cell and power battery, fuel cell and super capacitor dual-energy source hybrid drive system, fuel cell stack, power battery and super capacitor three-energy source hybrid drive system. Among them, the fuel cell and power battery dual-energy hybrid drive structure is the common power structure of the current hydrogen fuel vehicle, the fuel cell output voltage is matched with the DC bus voltage through the step-up and step-down function of the DC / DC (Direct Current to Direct Current Converter) converter, and the power battery is connected with the DC bus. The fuel cell provides continuous power as the main power source, when the vehicle is in acceleration, climbing or other conditions that increase the demand power of the vehicle, the power battery provides compensation power, and when the vehicle is decelerated or other conditions that reduce the demand power of the vehicle, the power battery absorbs the excess energy of the fuel cell and the regenerative braking energy of the vehicle.

[0034] The common working states of the fuel cell system on the whole vehicle generally include starting, running and shutting down. In the control strategy, the fuel cell system shutdown trigger condition is generally that the state of charge (SOC) of the power battery reaches the program set value, or the power battery is caused by its own working state (such as temperature rise) to cause its own allowed charging power to be less than the minimum working power of the fuel cell. In practice, when the fuel cell is in the shutdown state, the fuel cell will not stop the external power output immediately, and the fuel cell system will have a load reduction and purging process, the whole process lasts more than 5 minutes, and in special cases, it can be about 10 minutes, and during this period, the fuel cell still outputs power, for example, the output power of a light truck is generally about 4kW, and the output power of a heavy truck is about 15kW. During the shutdown period of the fuel cell system, if the whole vehicle has no other devices to consume the output power of the fuel cell system (generally in the vehicle static working condition or super long downhill working condition), the electric power can only be passively received by the power battery, and at this time, the allowed power recovery of the power battery is generally at a low level, so there is a risk of overcharging the power battery, which may cause damage to the power battery or cause a safety accident.

[0035] To solve the above problems, the first aspect of the embodiment of the present application provides a hybrid power source system, which can absorb part or all of the energy generated by the fuel cell stack in the shutdown purging stage through the discharge module, prevent the fuel cell stack from overcharging the power battery in the shutdown purging stage, avoid accidents caused by overcharging the power battery, and improve reliability and safety.

[0036] As shown in Figure 1 The hybrid power source system 100 includes a fuel cell system 110, a power battery 120, a voltage conversion module 130 and a discharge module 140.

[0037] The fuel cell system 110 includes a fuel cell stack 111; the power battery 120 is connected to a direct current bus; the input end of the voltage conversion module 130 is connected to the fuel cell stack 111, the output end of the voltage conversion module 130 is connected to the direct current bus, and the voltage conversion module 130 is used to convert the output voltage of the fuel cell stack 111 and transmit the converted voltage to the direct current bus; the discharge module 140 is connected to the output end of the voltage conversion module 130 and is connected in parallel with the power battery 120, and the discharge module 140 is used to start discharging to absorb at least part of the energy generated by the fuel cell stack 111 in the shutdown purging stage in response to the shutdown purging instruction of the fuel cell system 110 when the vehicle meets the shutdown trigger condition of the fuel cell system 110 and the chargeable capacity of the power battery 120 is less than the preset capacity threshold.

[0038] Specifically, the fuel cell stack 111 in the fuel cell system 110 generates electric energy by reacting fuel (such as hydrogen) with oxygen through a chemical reaction. Inside the fuel cell stack 111, oxidation reaction of the fuel occurs at the anode, generating electrons and ions. The electrons pass through an external circuit to provide electric power, so that the fuel cell system 110 supplies power to the drive system. When the fuel cell stack 111 works to generate electricity, the generated current is transmitted to the voltage conversion module 130. The voltage conversion module 130 converts the direct current generated by the fuel cell stack 111 into a voltage and current suitable for the operation of other devices. The power battery 120 is mainly used as an auxiliary power supply. The power battery 120 stores excess electric energy generated by the fuel cell stack 111 and recycles electric energy generated during vehicle travel, so as to provide additional power for the vehicle when needed (for example, during vehicle sudden acceleration or continuous uphill road sections). In the hybrid power source system 100, the fuel cell system 110 and the power battery 120 work together to provide power for starting the hybrid power source system 100.

[0039] When the fuel cell system 110 is in the shutdown state, the fuel cell system 110 needs to be shut down and purged to reduce residual liquid water inside the fuel cell stack 111 to avoid water freezing and blocking in a low-temperature environment, affecting the performance and service life of the fuel cell stack 111. Therefore, the fuel cell system 110 does not immediately stop outputting electric power to the outside, and the power battery 120 still stores excess electric power generated by the fuel cell stack 111. To avoid overcharging the power battery 120 and causing damage to the power battery 120 or triggering a safety accident, the hybrid power source system 100 is provided with a discharging module 140. When the fuel cell system 110 is in the shutdown and purging stage, the discharging module 140 is started to absorb energy generated by the fuel cell stack in the shutdown and purging stage. If the chargeable capacity of the power battery 120 is less than a preset capacity threshold, the power battery 120 cannot absorb too much electric energy, otherwise, the power battery 120 is likely to be overcharged. In this case, at least part of the energy generated in the shutdown and purging stage can be shared by the discharging module 140. The preset capacity threshold can be understood as a lower limit value of the energy generated in the shutdown and purging stage. If the chargeable capacity of the power battery 120 is less than the preset capacity threshold, the power battery 120 itself cannot completely accept the energy generated in the shutdown and purging stage. In this case, the energy generated in the shutdown and purging stage can be absorbed by the discharging module 140 or shared by the power battery 120 and the discharging module 140 to avoid overcharging the power battery 120. For example, the connection path between the fuel cell system 110 and the power battery 120 can be disconnected, and the discharging module 140 can be used to absorb electric energy. If the state of charge of the power battery 120 does not reach a set value, the original circuit connection state between the fuel cell system 110 and the power battery 120 can be maintained, part of the electric energy can be absorbed by the discharging module 140, and the electric energy supplied to the power battery 120 can be reduced. That is, the discharging module 140 shares part of the electric energy to avoid overcharging the power battery 120.

[0040] According to the hybrid power source system provided in the embodiments of the present application, when the fuel cell system is shut down and purged, the energy discharged from the fuel cell stack is transmitted to the discharging module, part or all of the energy generated by the fuel cell stack in the shutdown and purging stage is absorbed by the discharging module, overcharging of the power battery by the fuel cell stack in the shutdown and purging stage is prevented, accidents caused by overcharging of the power battery are avoided, and the reliability and safety are improved.

[0041] In some embodiments, as shown in Figure 1 The direct-current bus includes a positive direct-current bus and a negative direct-current bus. The first end of the positive direct-current bus and the first end of the negative direct-current bus are connected with the output end of the voltage conversion module 130. The discharging module 140 includes a discharging unit 142 and a first switching unit 141 connected in series.

[0042] The first end of the series connection of the discharging unit 142 and the first switch unit 141 is connected to the positive DC bus, the second end of the series connection of the discharging unit 142 and the first switch unit 141 is connected to the negative DC bus, and the first switch unit 141 is closed in response to a shutdown purge instruction of the fuel cell system 110, and the discharging unit 142 is used for discharging when the first switch unit 141 is in a closed state.

[0043] Specifically, when the fuel cell system 110 is shut down and purged, the first switch unit 141 is closed in response to a shutdown purge instruction of the fuel cell system 110, at this time, the electric energy generated by the fuel cell system 110 is transmitted to the discharging unit 142 through the first switch unit 141, the discharging unit 142 discharges, avoids the electric energy from being transmitted to the power battery 120, and overcharges the power battery 120. For example, the discharging unit 142 can be a discharging resistor, and the electric energy generated by the fuel cell system 110 during the shutdown and purge of the fuel cell system 110 is transmitted to the discharging resistor through the first switch unit 141. When the current passes through the discharging resistor, heat is generated, the electric energy is converted into heat energy, and the discharging purpose is achieved.

[0044] For example, a discharging resistor is added in the fuel cell system 110 in the whole vehicle architecture, when the shutdown purge command is sent to the fuel cell system 110 by the whole vehicle controller, the first switch unit 141 is closed, and the energy generated during the shutdown and purge of the fuel cell system 110 is absorbed by the discharging resistor, thereby avoiding the overcharging problem of the power battery 120 during the shutdown and purge of the fuel cell vehicle, and improving the reliability and safety of the fuel cell vehicle.

[0045] In some embodiments, as shown in Figure 1 The hybrid power source system 100 further includes a power distribution module 150 and a second switch unit 101.

[0046] The input end of the power distribution module 150 is connected to the output end of the voltage conversion module 130 and the discharging module 140 through the positive DC bus and the negative DC bus, the first output end of the power distribution module 150 is connected to the power battery 120, and the power distribution module 150 is used for distributing the output energy of the fuel cell stack 111 and / or the power battery 120 according to the running state of the vehicle; the second switch unit 101 is arranged on the positive DC bus, the first end of the second switch unit 101 is connected to the output end of the voltage conversion module 130 and the discharging module 140, the second end of the second switch unit 101 is connected to the input end of the power distribution module 150, and the second switch unit 101 is used for being disconnected in response to an end of shutdown purge instruction or being disconnected in response to a shutdown purge instruction of the fuel cell system.

[0047] Specifically, the main function of the power distribution module 150 is to intelligently distribute the output energy of the fuel cell stack 111 and the power battery 120 according to the actual demand of the vehicle, including reasonably distributing the energy in different states such as vehicle starting, acceleration, cruising, deceleration and parking, to meet the power demand of the vehicle, while optimizing the energy utilization efficiency. For example, when the vehicle is running normally, the power distribution module 150 distributes the output energy of the fuel cell stack 111, and the power battery 120 stores energy. In the acceleration or uphill working condition, the power distribution module 150 distributes the output energy of the fuel cell stack 111 and the power battery 120 at the same time, to ensure the power of the vehicle.

[0048] When the fuel cell system 110 is in the shutdown state, the fuel cell system 110 will not immediately stop the external electric power output. The fuel cell system 110 will have a load reduction and purging process, which lasts for more than 5 minutes, and in special cases, it can be about 10 minutes. During this period, the fuel cell still outputs power. The output power of the light truck is generally about 4kW, and the output power of the heavy truck is about 15kW. When the charge state of the power battery 120 does not reach the set value, the second switch unit 101 remains closed during the shutdown and purging process of the fuel cell system 110 to provide power to the power battery 120, and the second switch unit 101 is disconnected at the end of the shutdown and purging process. When the charge state of the power battery 120 reaches the set value, the second switch unit 101 is disconnected in response to the shutdown and purging instruction of the fuel cell system, to avoid overcharging of the power battery 120.

[0049] In some embodiments, as shown in Figure 2 The fuel cell system 110 further includes a fuel cell system controller 113.

[0050] The fuel cell system controller 113 is connected with the first switch unit 141 and the second switch unit 101, and is configured to control the switching state of the first switch unit 141 and the second switch unit 101 according to the shutdown and purging instruction of the fuel cell system 110 or according to the shutdown and purging state of the fuel cell system 110.

[0051] Specifically, the fuel cell system controller 113 controls the switching state of the first switching unit 141 and the second switching unit 101 according to the fuel cell system 110 shutdown purge instruction or according to the fuel cell system shutdown purge state, when the fuel cell system 110 is normally working, the fuel cell system controller 113 controls the first switching unit 141 to be open, and the second switching unit 101 to be closed, at this time, the fuel cell system 110 supplies power to other devices in the driving system; when the fuel cell system 110 receives the shutdown purge instruction and performs the shutdown purge, the fuel cell system controller 113 controls the first switching unit 141 to be closed, at this time, the fuel cell system 110 discharges electric energy to the discharging unit 142, the discharging unit 142 discharges, and when the fuel cell system 110 completes the shutdown purge, the fuel cell system controller 113 controls the first switching unit 141 and the second switching unit 101 to be open.

[0052] For example, the application provides a vehicle architecture and control strategy for preventing overcharging of the power battery system during the shutdown purge stage of the fuel cell vehicle, and through the new vehicle architecture and control strategy, overcharging of the power battery during the shutdown purge stage of the fuel cell vehicle can be prevented, and a series of vehicle safety problems caused by overcharging of the power battery can be avoided.

[0053] A discharging resistor R is added to the fuel cell vehicle power architecture. When the vehicle is normally running, the second switching unit 101 is closed, the first switching unit 141 is open, and the fuel cell system 110 provides the energy source for the vehicle, when the vehicle is running in a climbing or accelerating working condition, the energy generated by the fuel cell system 110 is insufficient to maintain normal operation of the vehicle, at this time, the power battery 120 should provide compensation power for the vehicle, when the vehicle is braked and decelerated, the power battery 120 recovers part of the regenerative braking energy.

[0054] When the fuel cell system 110 is shut down, the vehicle controller sends a shutdown purge instruction to the fuel cell system controller 113, the first switching unit 141 is closed, and the discharging resistor R recovers the energy generated during the shutdown purge stage of the fuel cell system 110, when the fuel cell system 110 completes the shutdown, the second switching unit 101 is open, effectively avoiding the overcharging problem of the power battery 120 during the shutdown purge stage of the fuel cell vehicle, and improving the reliability and safety of the fuel cell vehicle.

[0055] As shown in Figure 1 The fuel cell system 110 further comprises a fuel cell auxiliary module 112.

[0056] The fuel cell auxiliary module 112 is connected with the output end of the voltage conversion module 130, and the fuel cell auxiliary module 112 is used for providing working gas for the fuel cell stack 111 and managing the state of the fuel cell stack 111.

[0057] The fuel cell auxiliary module 112 is used to support the normal operation of the fuel cell stack 111, the fuel cell stack 111 needs a specific gas (hydrogen or oxygen) to generate electric energy, the fuel cell auxiliary module 112 stores the gas needed by the fuel cell stack 111 to generate electric energy, and delivers the gas to the fuel cell stack 111 when the fuel cell stack 111 works, and at the same time, the fuel cell auxiliary module 112 is also responsible for monitoring and managing the operation state of the fuel cell stack 111, the fuel cell auxiliary module 112 monitors the key parameters of the fuel cell stack 111 in real time, ensures the stable operation of the fuel cell stack 111, and if any abnormal condition is detected, the fuel cell auxiliary module 112 will trigger an alarm to protect the fuel cell stack 111 from damage.

[0058] The second aspect of the present application provides a vehicle, such as Figure 3 As shown in the figure, the vehicle 200 includes the hybrid power source system 100 of the above embodiment, a drive system 400 and a vehicle controller 201.

[0059] As shown in the figure, the drive system 400 includes the motor system 160, the motor system 160 includes a motor controller and a drive motor, and the drive system 400 can also include a reduction mechanism and the like. Figure 1 The motor system 160 is connected with the power distribution module 150 through a DC bus for driving the vehicle. The power distribution module 150 of the hybrid power source system 100 transmits electric energy to the motor system 160 through the DC bus to drive the vehicle to run.

[0060] The vehicle controller 201 is connected with the drive system 400 and the motor controller, and is used to send a fuel cell system shutdown purge instruction to the hybrid power source system 100 when the vehicle 200 meets the fuel cell system shutdown trigger condition.

[0061] According to the vehicle of the embodiment of the present application, when the vehicle meets the fuel cell system shutdown trigger condition, the vehicle controller sends a fuel cell system shutdown purge instruction to the hybrid power source system, the fuel cell system is purged, and when the fuel cell system is purged, the energy discharged from the fuel cell stack is transmitted to the discharge module, part or all of the energy generated by the fuel cell stack in the shutdown purge stage is absorbed through the discharge module, the overcharging of the power battery by the fuel cell stack in the shutdown purge stage is prevented, the accident caused by the overcharging of the power battery is avoided, and the reliability and safety are improved.

[0062] The following refers to

[0063] The vehicle control method according to the third aspect of the present application is described, as shown in the figure, the method at least includes steps S1 to S2. Figure 4 Figure 4

[0064] ​​Step S1, determine that the vehicle meets the fuel cell system shutdown trigger condition and the chargeable capacity of the power battery is less than a preset capacity threshold.

[0065] The fuel cell system shutdown trigger condition includes that the state of charge of the power battery reaches a charge threshold or the allowable charging power of the power battery is less than a lower limit value of the working power of the fuel cell stack.

[0066] Specifically, when the vehicle is stationary or on a long downhill, the fuel cell system does not need to power the drive system, at this time, the fuel cell system can be shut down, the vehicle operation is monitored in real time, it is determined whether the vehicle meets the fuel cell system shutdown trigger condition, and it is determined whether the chargeable capacity of the power battery is less than a preset capacity threshold, which can be understood as a lower limit value of the energy generated in the shutdown purge phase; the state of charge of the power battery is an important parameter of the remaining capacity of the power battery, when the state of charge of the power battery reaches a charge threshold, the fuel cell system is triggered to shut down, because when the state of charge of the power battery is higher than the threshold, it indicates that the power battery is fully charged, at this time, the fuel cell system continues to work and discharge, which may cause the power battery to be overcharged, therefore, when the state of charge of the power battery reaches or exceeds the threshold, the fuel cell system stops working; the working power of the fuel cell stack refers to the power range that the fuel cell stack can output when working normally, when the allowable charging power of the power battery is less than the lower limit value of the working power of the fuel cell stack, it means that the energy generated by the fuel cell stack cannot be effectively stored in the power battery, therefore, when the allowable charging power of the power battery is less than the lower limit value of the working power of the fuel cell stack, the fuel cell system stops working.

[0067] Step S2, in response to the fuel cell system shutdown purge instruction, control the discharge module of the hybrid power source system to start discharging to absorb at least part of the energy generated by the fuel cell stack in the shutdown purge phase.

[0068] Specifically, when the vehicle meets the fuel cell system shutdown trigger condition, the fuel cell system is purged to prevent the residual moisture inside the fuel cell stack from freezing after shutdown to cause startup failure, during the shutdown purge phase of the fuel cell system, the fuel cell stack may generate a certain amount of energy, and the power battery will also store the excess energy generated by the fuel cell stack, in order to avoid overcharging the power battery, it is necessary to control the discharge module of the hybrid power source system to start discharging, the main function of the discharge module is to consume the energy generated during the shutdown purge of the fuel cell system; if the state of charge of the power battery reaches a set value, it cannot absorb excess electrical energy, at this time, the connection path between the fuel cell system and the power battery can be disconnected, and only the discharge module can be used to absorb electrical energy, if the state of charge of the power battery does not reach the set value, the original connection state of the fuel cell system and the power battery circuit during shutdown can be maintained, part of the electrical energy can be absorbed by the discharge module, and the electrical energy supplied to the power battery can be reduced, that is, the discharge module shares part of the electrical energy, so as to avoid overcharging the power battery.

[0069] According to the vehicle control method, when the vehicle meets the fuel cell system shutdown trigger condition, the fuel cell system is subjected to shutdown purging after receiving the fuel cell system shutdown purging instruction, and the energy discharged from the fuel cell stack is transmitted to the discharging module during the shutdown purging of the fuel cell system. The discharging module absorbs part or all of the energy generated by the fuel cell stack during the shutdown purging stage, prevents the fuel cell stack from overcharging the power battery during the shutdown purging stage, avoids accidents caused by overcharging of the power battery, and improves reliability and safety.

[0070] In some embodiments, the vehicle control method further comprises: in a normal driving state of the vehicle, controlling the first switch unit in the hybrid power source system to be in an open state, and controlling the second switch unit in the hybrid power source system to be in a closed state.

[0071] The first switch unit is located between the discharging unit in the discharging module and the output end of the voltage conversion module in the hybrid power source system, and the second switch unit is connected between the output end of the voltage conversion module and the power supply distribution module in the hybrid power source system.

[0072] Specifically, in the normal driving of the vehicle, the first switch unit in the hybrid power source system is controlled to be in an open state, and the second switch unit in the hybrid power source system is controlled to be in a closed state. At this time, the electric energy generated by the fuel cell system is used to power the devices in the driving system. Since the first switch unit is open, the discharging module cannot consume the electric energy generated by the fuel cell system. At the same time, the electric energy generated by the fuel cell system can be transmitted to the power battery through the second switch unit, so that the power battery stores the electric energy generated by the fuel cell system.

[0073] In some embodiments, in response to the fuel cell system shutdown purging instruction, the discharging module of the hybrid power source system is controlled to start discharging, which comprises: in response to the fuel cell system shutdown purging instruction, the first switch unit of the discharging module is controlled to be closed.

[0074] Specifically, in response to the fuel cell system shutdown purging instruction, the first switch unit is closed when the fuel cell system is subjected to shutdown purging after receiving the fuel cell system shutdown purging instruction. At this time, the electric energy generated by the fuel cell system will be transmitted to the discharging unit through the first switch unit, and the discharging unit will discharge, avoiding the electric energy from being transmitted to the power battery and causing overcharging of the power battery.

[0075] In some embodiments, the vehicle control method further comprises: determining that the shutdown purging stage of the fuel cell system is over, controlling the first switch unit to be open, and controlling the second switch unit to be open.

[0076] Specifically, after the fuel cell system shutdown purging phase ends, the discharging module does not need to discharge again, at this time, the first switch unit is controlled to be disconnected, avoiding the fuel cell system from working again due to the connection of the first switch unit, resulting in the power consumption of the fuel cell system by the discharging module; at the same time, the second switch unit is controlled to be disconnected, and the state of charge of the power battery is determined when the fuel cell system works again, to determine whether the second switch unit can be closed.

[0077] The fourth aspect of the present application provides an electronic device, such as Figure 5 As shown in the figure, the electronic device 300 includes at least one processor 301 and a memory 302.

[0078] The at least one processor 301 is in communication connection with the memory 302, and the memory 302 stores a computer program that can be executed by the at least one processor 301, and the at least one processor 301 executes the computer program to realize the vehicle control method.

[0079] According to the electronic device of the embodiment of the present application, the corresponding vehicle control program can be stored in the memory, and when the vehicle control method is realized, it is determined that the vehicle satisfies the fuel cell system shutdown triggering condition, after the fuel cell system shutdown purging instruction is received by the hybrid power source system, the fuel cell system performs shutdown purging, and when the fuel cell system is shutdown and purged, the energy discharged by the fuel cell stack is transmitted to the discharging module, part or all of the energy generated by the fuel cell stack during the shutdown purging phase is absorbed by the discharging module, overcharging of the power battery by the fuel cell stack during the shutdown purging phase is prevented, accidents caused by overcharging of the power battery are avoided, and the reliability and safety are improved.

[0080] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" means that the specific features, substrates, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the exemplary description of the above terms does not necessarily refer to the same embodiment or example.

[0081] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and purposes of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A hybrid power source system, characterized in that, include: A fuel cell system, comprising a fuel cell stack; The power battery is connected to the DC bus; A voltage conversion module is provided, wherein the input terminal of the voltage conversion module is connected to the fuel cell stack, and the output terminal of the voltage conversion module is connected to the DC bus. The voltage conversion module is used to convert the output voltage of the fuel cell stack and transmit the converted voltage to the DC bus. A discharge module is connected to the output terminal of the voltage conversion module and in parallel with the power battery. The discharge module is used to start discharging in response to the fuel cell system shutdown purging command when the vehicle meets the fuel cell system shutdown trigger condition and the rechargeable capacity of the power battery is less than a preset capacity threshold, so as to absorb at least part of the energy generated by the fuel cell stack during the shutdown purging phase. The DC bus includes a positive DC bus and a negative DC bus, and the first end of the positive DC bus and the first end of the negative DC bus are both connected to the output end of the voltage conversion module. The hybrid power source system further includes a second switching unit, which is disposed on the positive DC bus. The first end of the second switching unit is connected to the output end of the voltage conversion module and the discharge module. The second switching unit is used to disconnect in response to the shutdown purging phase end command or in response to the fuel cell system shutdown purging command.

2. The hybrid power source system according to claim 1, characterized in that, The discharge module includes a discharge unit and a first switch unit connected in series. The first end of the discharge unit and the first switch unit connected in series is connected to the positive DC bus, and the second end of the discharge unit and the first switch unit connected in series is connected to the negative DC bus. The first switching unit is used to close in response to the shutdown purging command of the fuel cell system, and the discharge unit is used to discharge when the first switching unit is in the closed state.

3. The hybrid power source system according to claim 2, characterized in that, The hybrid power source system also includes: The power distribution module has its input terminal connected to the output terminal of the voltage conversion module and the discharge module via the positive DC bus and the negative DC bus. The second switching unit is disposed on the positive DC bus between the input terminal of the power distribution module and the output terminal of the voltage conversion module. The first output terminal of the power distribution module is connected to the power battery and is used to distribute the output energy of the fuel cell stack and / or the power battery according to the vehicle operating status.

4. The hybrid power source system according to claim 3, characterized in that, The fuel cell system also includes: A fuel cell system controller, which is connected to the first switch unit and the second switch unit, is used to control the switching states of the first switch unit and the second switch unit according to the fuel cell system shutdown purging command or according to the fuel cell system shutdown purging status.

5. A vehicle, characterized in that, include: The hybrid power source system according to any one of claims 1-4; A drive system, comprising a motor controller and a drive motor, wherein the motor controller is connected to the power distribution module of the hybrid power source system and the drive motor; The vehicle controller, which is connected to the hybrid power source system and the motor controller, is used to send a fuel cell system shutdown purging command to the hybrid power source system when the vehicle meets the shutdown trigger conditions of the fuel cell system.

6. A vehicle control method, characterized in that, For a hybrid power source system according to any one of claims 1-4, the vehicle control method includes: The vehicle is determined to meet the fuel cell system shutdown trigger condition and the rechargeable capacity of the power battery is less than a preset capacity threshold. The fuel cell system shutdown trigger condition includes the power battery's state of charge reaching a charge threshold or the power battery's allowable charging power being less than the lower limit of the working power of the fuel cell stack. In response to a shutdown purging command for the fuel cell system, the discharge module of the hybrid power source system is controlled to start discharging to absorb at least a portion of the energy generated by the fuel cell stack during the shutdown purging phase.

7. The vehicle control method according to claim 6, characterized in that, The vehicle control method further includes: When the vehicle is in normal driving condition, the first switching unit in the hybrid power source system is controlled to be in the open state, and the second switching unit in the hybrid power source system is controlled to be in the closed state. The first switching unit is located between the discharge unit in the discharge module and the output terminal of the voltage conversion module in the hybrid power source system, and the second switching unit is connected between the output terminal of the voltage conversion module and the power distribution module in the hybrid power source system.

8. The vehicle control method according to claim 7, characterized in that, In response to a fuel cell system shutdown purge command, the discharge module of the hybrid power source system is controlled to start discharging, including: In response to the fuel cell system shutdown purging command, the first switching unit of the discharge module is controlled to close.

9. The vehicle control method according to claim 8, characterized in that, The vehicle control method further includes: Once the shutdown purging phase of the fuel cell system is determined to be complete, the first switching unit is controlled to open, and the second switching unit is controlled to open.

10. An electronic device, characterized in that, include: At least one processor; A memory that is communicatively connected to the at least one processor; The memory stores a computer program that can be executed by the at least one processor, which, when executing the computer program, implements the vehicle control method according to any one of claims 6-9.

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