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

Abstract

The invention 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 cell, a voltage conversion module and a discharging module. The fuel cell system comprises a fuel cell stack, the input end of the voltage conversion module is connected with the fuel cell stack, and the output end of the voltage conversion module is connected with the 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 the shutdown purging stage in response to a shutdown purging instruction of the fuel cell system when the vehicle meets the shutdown triggering condition of the fuel cell system and the chargeable capacity of the power cell is smaller than a preset capacity threshold value. According to the system, part or all of energy generated by the fuel cell stack in the shutdown purging stage can be absorbed through the discharge module, the fuel cell stack is prevented from overcharging the power cell in the shutdown purging stage, accidents caused by overcharging of the power cell are avoided, and the reliability and the safety are improved.

Description

Technical Field

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

[0002] In the related technology, when a fuel cell vehicle is in the shutdown state, the fuel cell system needs to be shut down and purged to reduce the residual liquid water inside the fuel cell stack to avoid water freezing and blockage in a low temperature environment, affecting the performance and life of the fuel cell stack. Therefore, the fuel cell system does not immediately stop outputting external electrical power. During this shutdown period, if there are no other devices in the vehicle that consume the output power of the fuel cell system, its electrical power can only be passively received by the power battery. At this time, the power battery generally allows the recovery power to be at a low level. Therefore, there is a risk of overcharging the power battery, which may cause damage to the power battery, resulting in drive system failure and causing a safety accident. Summary of the invention

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

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

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

[0006] A fourth objective of the present invention is to provide an electronic device.

[0007] In order to solve the above problems, an embodiment of the first aspect of the present invention provides a hybrid power source system, including: a fuel cell system, the fuel cell system including a fuel cell stack; a power battery, the power battery is connected to a DC bus; a voltage conversion module, the input end of the voltage conversion module is connected to the fuel cell stack, and the output end 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, the discharge module is connected to the output end of the voltage conversion module and connected in parallel with the power battery, the discharge module is used to respond to the fuel cell system shutdown purge instruction to start discharging to absorb at least part of the energy generated by the fuel cell stack during the shutdown purge stage 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.

[0008] According to the hybrid power source system of the embodiment of the present invention, when the fuel cell system is shut down and purged, the energy released by the fuel cell stack is first 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 and purging stage, thereby preventing the fuel cell stack from overcharging the power battery during the shutdown and purging stage, avoiding accidents caused by overcharging of the power battery, and improving reliability and safety.

[0009] In some embodiments, 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 discharge module includes a discharge unit and a first switch unit connected in series, and the first end of the discharge unit and the first switch unit after being connected in series is connected to the positive DC bus, and the second end of the discharge unit and the first switch unit after being connected in series is connected to the negative DC bus; the first switch unit is used to close in response to the fuel cell system shutdown purge instruction, and the discharge unit is used to discharge when the first switch unit is in a closed state.

[0010] In some embodiments, the hybrid power source system also includes: a power distribution module, the input end of the power distribution module is connected to the output end of the voltage conversion module and the discharge module through the positive DC bus and the negative DC bus, and the first output end 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; a second switch unit, the second switch unit is arranged on the positive DC bus, the first end of the second switch unit is connected to the output end of the voltage conversion module and the discharge module, and the second end of the second switch unit is connected to the input end of the power distribution module, and the second switch unit is used to disconnect in response to the end instruction of the shutdown purge phase or in response to the shutdown purge instruction of the fuel cell system.

[0011] In some embodiments, the fuel cell system also includes: a fuel cell system controller, which is connected to the first switch unit and the second switch unit, and is used to control the switching state of the first switch unit and the second switch unit according to the fuel cell system shutdown purge instruction or according to the fuel cell system shutdown purge status.

[0012] A second aspect of the present invention provides a vehicle, comprising: the hybrid power source system described in the above embodiment; a drive system, the drive system comprising a motor controller and a drive motor, the motor controller being connected to a power distribution module of the hybrid power source system and the drive motor; a vehicle controller, the vehicle controller being connected to the hybrid power source system, and being used to send a fuel cell system shutdown purge command to the hybrid power source system when the vehicle meets the fuel cell system shutdown trigger condition.

[0013] According to the vehicle of the embodiment of the present invention, when the vehicle meets the fuel cell system shutdown trigger condition, the vehicle controller sends the fuel cell system shutdown purge command to the hybrid power source system, and the fuel cell system performs shutdown purge. When the fuel cell system is shut down and purged, the energy released by 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 and purge stage, thereby preventing the fuel cell stack from overcharging the power battery during the shutdown and purge stage, avoiding accidents caused by overcharging of the power battery, and improving reliability and safety.

[0014] A third aspect of the present invention provides a vehicle control method for the hybrid power source system described in the above embodiment, the vehicle control method comprising: determining that 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, wherein the fuel cell system shutdown trigger condition includes that the charge state of the power battery reaches the charge threshold or the allowable charging power of the power battery is less than the lower limit of the operating power of the fuel cell stack; in response to the 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 an embodiment of the present invention, when the vehicle meets the fuel cell system shutdown triggering conditions, after the hybrid power source system receives the fuel cell system shutdown purge instruction, the hybrid power source system controls the fuel cell system to perform shutdown purge. When the fuel cell system is shut down and purged, the energy released by the fuel cell stack is first 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 and purge stage, thereby preventing the fuel cell stack from overcharging the power battery during the shutdown and purge stage, avoiding accidents caused by overcharging of the power battery, and improving reliability and safety.

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

[0017] In some embodiments, in response to a fuel cell system shutdown purge instruction, controlling a discharge module of the hybrid power system to start discharging includes: in response to the fuel cell system shutdown purge instruction, controlling a first switch unit of the discharge module to close.

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

[0019] A fourth aspect of the present invention provides an electronic device, comprising: at least one processor; a memory communicatively connected to the at least one processor; the memory storing a computer program executable by the at least one processor, wherein the at least one processor implements the vehicle control method described in the above embodiment when executing the computer program.

[0020] According to the electronic device of the embodiment of the present invention, the corresponding vehicle control program can be stored in the memory. When the vehicle control method is implemented, it is determined that the vehicle meets the fuel cell system shutdown trigger condition. After the hybrid power source system receives the fuel cell system shutdown purge instruction, the hybrid power source system controls the fuel cell system to shut down and purge. When the fuel cell system is shut down and purged, the energy released by 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 and purge stage, thereby preventing the fuel cell stack from overcharging the power battery during the shutdown and purge stage, avoiding accidents caused by overcharging of the power battery, and improving reliability and safety.

[0021] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which: Figure 1 is a schematic diagram of the architecture of a hybrid power source system and a drive system according to one embodiment of the present invention; Figure 2 is a structural block diagram of a fuel cell system according to an embodiment of the present invention; Figure 3 is a structural block diagram of a vehicle according to an embodiment of the present invention; Figure 4 is a flow chart of a vehicle control method according to an embodiment of the present invention; Figure 5 is a structural block diagram of an electronic device according to an embodiment of the present invention.

[0023] Reference numerals: Vehicle 200; electronic device 300; Hybrid power source system 100; drive system 400; vehicle controller 201; processor 301; memory 302; 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

[0024] Embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Embodiments of the present invention are described in detail below.

[0025] In the prior art, the topological structure of the fuel cell hybrid system mainly includes: fuel cell and power battery, fuel cell and supercapacitor dual energy source hybrid drive system, fuel cell stack, power battery and supercapacitor three energy source hybrid drive system. Among them, the dual energy hybrid drive structure of fuel cell and power battery is the common power structure of hydrogen fuel vehicles at present. The output voltage of the fuel cell is matched with the DC bus voltage through the boost and buck function of the DC / DC (Direct Current to Direct Current Converter, DC to DC) converter, and the power battery is connected to the DC bus. The fuel cell provides continuous power as the main power source. When the vehicle is accelerating, climbing or other conditions that increase the power demand of the whole vehicle, the power battery provides compensatory power, and when the vehicle brakes and decelerates or other conditions where the power demand of the whole vehicle is reduced, the power battery absorbs the excess energy of the fuel cell and the regenerative braking energy of the vehicle.

[0026] 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 shutdown trigger condition of the fuel cell system is generally that the power battery SOC (State of Charge) reaches the program setting value, or the power battery is affected by its own working state (such as temperature increase), resulting in its own allowable charging power being 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 immediately stop outputting external power. The fuel cell system will have a load reduction and purge process. The whole process lasts for more than 5 minutes, and can be up to about 10 minutes in special cases. During this period, the fuel cell will still output power to the outside. For example, the output power of light trucks is generally around 4kW, and that of heavy trucks is around 15kW. During the shutdown period of the fuel cell system, if there are no other devices in the vehicle that consume the output power of the fuel cell system (generally when the vehicle is stationary or in an extremely long downhill condition), its electric power can only be passively received by the power battery. At this time, the power recovery power allowed by 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.

[0027] In order to solve the above problems, an embodiment of the first aspect of the present invention provides a hybrid power source system, which can absorb part or all of the energy generated by the fuel cell stack during the shutdown and purge stage through a discharge module, prevent the fuel cell stack from overcharging the power battery during the shutdown and purge stage, avoid accidents caused by overcharging of the power battery, and improve reliability and safety.

[0028] like Figure 1 As shown, 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 .

[0029] Among them, the fuel cell system 110 includes a fuel cell stack 111; the power battery 120 is connected to the DC bus; the input end of the voltage conversion module 130 is connected to the fuel cell stack 111, and the output end of the voltage conversion module 130 is connected to the DC 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 DC bus; the discharge module 140 is connected to the output end of the voltage conversion module 130 and connected in parallel with the power battery 120, and the discharge module 140 is used to respond to the shutdown purge instruction of the fuel cell system 110 when the vehicle meets the shutdown trigger condition of the fuel cell system 110 and the rechargeable capacity of the power battery 120 is less than the preset capacity threshold, and start discharging to absorb at least part of the energy generated by the fuel cell stack 111 during the shutdown purge stage.

[0030] Specifically, the fuel cell stack 111 in the fuel cell system 110 reacts fuel (such as hydrogen) with oxygen through a chemical reaction to generate electrical energy. Inside the fuel cell stack 111, the fuel undergoes an oxidation reaction at the anode to generate electrons and ions. The electrons provide electricity through an external circuit, so that the fuel cell system 110 supplies power to the drive system. When the fuel cell stack 111 is working 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 source. The power battery 120 stores the excess electricity generated by the fuel cell stack 111 and recovers the electrical energy generated during the driving process of the vehicle, so as to provide additional power for the vehicle when needed (for example, sudden acceleration of the vehicle, continuous uphill section). 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.

[0031] Since the fuel cell system 110 is in the shutdown state, the fuel cell system 110 needs to be shut down and purged to reduce the residual liquid water inside the fuel cell stack 111 to avoid water freezing and blockage in a low temperature environment, affecting the performance and life of the fuel cell stack 111. Therefore, the fuel cell system 110 will not immediately stop outputting external electricity. At this time, the power battery 120 will also store the excess electricity generated by the fuel cell stack 111. In order to avoid overcharging the power battery 120, causing damage to the power battery 120 or causing a safety accident, a discharge module 140 is set in the hybrid power source system 100. When the shutdown trigger condition of the fuel cell system 110 is met, for example, the vehicle is stopped or on a long downhill section, when the fuel cell system 110 is in the shutdown and purging stage, the discharge module Block 140 is started to absorb the energy generated by the fuel cell stack during the shutdown purge stage; if the rechargeable capacity of the power battery 120 is less than the preset capacity threshold, it cannot absorb too much electrical energy, otherwise it will easily cause overcharging of the power battery. At this time, the discharge module 140 can be used to share at least part of the energy generated during the shutdown purge stage, wherein the preset capacity threshold can be understood as the lower limit of the energy generated during the shutdown purge stage. The rechargeable capacity of the power battery 120 is less than the preset capacity threshold, that is, the power battery 120 itself cannot fully accept the energy generated during the shutdown purge stage. At this time, the discharge module 140 can be used to absorb the energy generated during the shutdown purge stage, or the power battery 120 and the discharge module 140 can share the energy generated during the shutdown purge stage together to avoid overcharging of the power battery 120. For example, the connection path between the fuel cell system 110 and the power battery 120 can be shut down, and electric energy can be absorbed only through the discharge module 140. If the charge state of the power battery 120 does not reach the set value, the circuit connection state of the fuel cell system 110 and the power battery 120 when it was originally shut down can be maintained, and part of the electric energy can be absorbed through the discharge module 140 to reduce the electric energy supplied to the power battery 120, that is, the discharge module 140 shares part of the electric energy to avoid overcharging of the power battery 120.

[0032] According to the hybrid power source system of the embodiment of the present invention, when the fuel cell system is shut down and purged, the energy released by 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 and purging stage, thereby preventing the fuel cell stack from overcharging the power battery during the shutdown and purging stage, avoiding accidents caused by overcharging of the power battery, and improving reliability and safety.

[0033] In some embodiments, Figure 1 As shown, 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 130; the discharge module 140 includes: a discharge unit 142 and a first switch unit 141 connected in series.

[0034] Among them, the first end of the discharge unit 142 and the first switch unit 141 after being connected in series is connected to the positive DC bus, the second end of the discharge unit 142 and the first switch unit 141 after being connected in series is connected to the negative DC bus, the first switch unit 141 is used to close in response to the shutdown purge instruction of the fuel cell system 110, and the discharge unit 142 is used to discharge when the first switch unit 141 is in a closed state.

[0035] Specifically, when the fuel cell system 110 is shut down and purged, the first switch unit 141 is closed in response to the shutdown and purge instruction of the fuel cell system 110. At this time, the electric energy generated by the fuel cell system 110 will be transmitted to the discharge unit 142 through the first switch unit 141. The discharge unit 142 discharges to avoid the electric energy being transmitted to the power battery 120 and causing the power battery 120 to overcharge. For example, the discharge unit 142 can be a discharge resistor. When the fuel cell system 110 is shut down and purged, the electric energy generated by the fuel cell system 110 will be transmitted to the discharge resistor through the first switch unit 141. When the current passes through the discharge resistor, heat is generated, and the electric energy is converted into heat energy, thereby achieving the purpose of discharge.

[0036] For example, a discharge resistor is added to the vehicle architecture of the fuel cell system 110. When the vehicle controller sends a shutdown and purge command to the fuel cell system 110, the first switch unit 141 is closed, and the energy generated during the shutdown and purge phase of the fuel cell system 110 will be absorbed by the discharge resistor, thereby avoiding the overcharging problem of the power battery 120 that may occur in the fuel cell vehicle during the shutdown and purge phase, thereby improving the reliability and safety of the fuel cell vehicle.

[0037] In some embodiments, Figure 1 As shown, the hybrid power system 100 further includes: a power distribution module 150 and a second switch unit 101 .

[0038] Among them, the input end of the power distribution module 150 is connected to the output end of the voltage conversion module 130 and the discharge module 140 through the positive DC bus and the negative DC bus, and the first output end of the power distribution module 150 is connected to the power battery 120, which is used to distribute the output energy of the fuel cell stack 111 and / or the power battery 120 according to the vehicle operating status; 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 discharge module 140, and 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 to disconnect in response to the end instruction of the shutdown purge phase or in response to the shutdown purge instruction of the fuel cell system.

[0039] 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 needs of the vehicle, including reasonable distribution of energy in different states such as vehicle start-up, acceleration, cruising, deceleration and parking to meet the power needs of the vehicle while optimizing energy utilization efficiency. For example, when the vehicle is driving normally, the power distribution module 150 distributes the output energy of the fuel cell stack 111 and the power battery 120 stores energy. Under acceleration or uphill conditions, the power distribution module 150 distributes the energy output of the fuel cell stack 111 and the power battery 120 to ensure vehicle power.

[0040] When the fuel cell system 110 is in the shutdown state, the fuel cell system 110 will not immediately stop outputting external electrical power. The fuel cell system 110 will have a load reduction and purging process. The whole process lasts for more than 5 minutes, and can be up to about 10 minutes under special circumstances. During this period, the fuel cell will still output power to the outside. The output power of light trucks is generally around 4kW, and that of heavy trucks is around 15kW. When the charge state of the power battery 120 has not reached the set value, the second switch unit 101 remains closed during the shutdown and purging stage of the fuel cell system 110 to provide electrical energy for the power battery 120. The second switch unit 101 is disconnected at the end of the shutdown and purging stage; 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 command of the fuel cell system to prevent overcharging of the power battery 120.

[0041] In some embodiments, Figure 2 As shown, the fuel cell system 110 further includes a fuel cell system controller 113 .

[0042] Among them, the fuel cell system controller 113 is connected to the first switch unit 141 and the second switch unit 101, and is used to control the switching state of the first switch unit 141 and the second switch unit 101 according to the shutdown purge instruction of the fuel cell system 110 or the shutdown purge state of the fuel cell system 110.

[0043] Specifically, the fuel cell system controller 113 controls the switching states of the first switch unit 141 and the second switch unit 101 according to the shutdown and purge instruction of the fuel cell system 110 or according to the shutdown and purge status of the fuel cell system. When the fuel cell system 110 is operating normally, the fuel cell system controller 113 controls the first switch unit 141 to be disconnected and the second switch unit 101 to be closed. At this time, the fuel cell system 110 supplies power to other devices in the drive system. When the fuel cell system 110 receives the shutdown and purge instruction and performs shutdown and purge, the fuel cell system controller 113 controls the first switch unit 141 to be closed. At this time, the fuel cell system 110 releases electrical energy and transmits it to the discharge unit 142, and the discharge unit 142 discharges. When the shutdown and purge of the fuel cell system 110 is completed, the fuel cell system controller 113 controls the first switch unit 141 and the second switch unit 101 to be disconnected.

[0044] For example, the present invention proposes a vehicle architecture and control strategy for preventing overcharging of the power battery system of a fuel cell vehicle during the shutdown and purge phase. Through a new vehicle architecture and control strategy, it is possible to prevent the fuel cell vehicle from overcharging the power battery during the shutdown and purge phase, thereby avoiding a series of vehicle safety problems caused by overcharging of the power battery.

[0045] A discharge resistor R is added to the power architecture of the fuel cell vehicle. When the vehicle is running normally, the second switch unit 101 is closed, the first switch unit 141 is disconnected, and the fuel cell system 110 provides an energy source for the entire vehicle. When the vehicle is climbing or accelerating, the energy generated by the fuel cell system 110 is insufficient to maintain the normal operation of the vehicle. At this time, the power battery 120 should provide compensation power for the vehicle. When the vehicle brakes and decelerates, the power battery 120 recovers part of the regenerative braking energy.

[0046] When the fuel cell system 110 is shut down, the vehicle controller sends a shutdown purge command to the fuel cell system controller 113, the first switch unit 141 is closed, and the discharge resistor R is used to recover the energy generated during the shutdown purge phase of the fuel cell system 110. When the fuel cell system 110 completes the shutdown, the second switch unit 101 is disconnected, effectively avoiding the overcharging problem of the power battery 120 that may occur in the fuel cell vehicle during the shutdown purge phase, thereby improving the reliability and safety of the fuel cell vehicle.

[0047] like Figure 1 As shown, the fuel cell system 110 further includes a fuel cell auxiliary module 112 .

[0048] The fuel cell auxiliary module 112 is connected to the output end of the voltage conversion module 130 , and the fuel cell auxiliary module 112 is used to provide working gas for the fuel cell stack 111 and manage the state of the fuel cell stack 111 .

[0049] The fuel cell auxiliary module 112 is used to support the normal operation of the fuel cell stack 111. The fuel cell stack 111 requires specific gases (hydrogen or oxygen) to generate electricity. The fuel cell auxiliary module 112 stores the gases required for the fuel cell stack 111 to generate electricity, and delivers the gases to the fuel cell stack 111 when the fuel cell stack 111 is working. At the same time, the fuel cell auxiliary module 112 is also responsible for monitoring and managing the operating status 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 to ensure the stable operation of the fuel cell stack 111. If any abnormality is detected, the fuel cell auxiliary module 112 will trigger an alarm to protect the fuel cell stack 111 from damage.

[0050] A second aspect of the present invention provides a vehicle, such as Figure 3 As shown, the vehicle 200 includes the hybrid power source system 100 of the above embodiment, the driving system 400 and the vehicle controller 201 .

[0051] Among them, Figure 1 As shown, the drive system 400 includes a motor system 160 , and the motor system 160 includes a motor controller and a drive motor. The drive system 400 may further include a speed reduction mechanism and the like.

[0052] The motor system 160 is connected to the power distribution module 150 via a DC bus for driving the vehicle. The power distribution module 150 of the hybrid power source system 100 transmits electrical energy to the motor system 160 via the DC bus to drive the vehicle.

[0053] The vehicle controller 201 is connected to 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.

[0054] According to the vehicle of the embodiment of the present invention, when the vehicle meets the fuel cell system shutdown trigger condition, the vehicle controller sends the fuel cell system shutdown purge command to the hybrid power source system, and the fuel cell system performs shutdown purge. When the fuel cell system is shut down and purged, the energy released by 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 and purge stage, thereby preventing the fuel cell stack from overcharging the power battery during the shutdown and purge stage, avoiding accidents caused by overcharging of the power battery, and improving reliability and safety.

[0055] Reference below Figure 4 A vehicle control method according to an embodiment of the third aspect of the present invention is described as follows: Figure 4 As shown, the method at least includes step S1 to step S2.

[0056] Step S1, determining that 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.

[0057] The fuel cell system shutdown triggering conditions include 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 operating power of the fuel cell stack.

[0058] Specifically, when the vehicle is stationary or on a long downhill slope, the fuel cell system is not needed to power the drive system. At this time, the fuel cell system can be shut down, and the vehicle operation status is monitored in real time to determine whether the vehicle meets the fuel cell system shutdown triggering conditions, and at the same time determine whether the rechargeable capacity of the power battery is less than the preset capacity threshold. The preset capacity threshold can be understood as the lower limit of the energy generated during the shutdown purge phase; the state of charge of the power battery is an important parameter of the remaining power of the power battery. When the state of charge of the power battery reaches the 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 full. At this time, the fuel cell system continues to work and discharge, which may cause the power battery to be overcharged. Therefore, when the charge state 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 during normal operation. When the allowable charging power of the power battery is less than the lower limit of the working power of the fuel cell stack, it means that the energy generated by the fuel cell stack cannot be effectively stored by the power battery. Therefore, the fuel cell system stops working when the allowable charging power of the power battery is less than the lower limit of the working power of the fuel cell stack.

[0059] Step S2, in response to the shutdown purge instruction of the fuel cell system, 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 phase.

[0060] Specifically, when the vehicle meets the fuel cell system shutdown trigger conditions, the fuel cell system is shut down and purged to prevent residual moisture inside the fuel cell stack from freezing after shutdown and causing startup failure. During the battery system shutdown and purging stage, the fuel cell stack may generate a certain amount of energy, and the power battery will also store excess electricity generated by the fuel cell stack. 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 when the fuel cell system is shut down and purged; if the power battery state of charge reaches the set value and cannot absorb excess electrical energy, at this time, the connection path between the fuel cell system and the power battery can be shut down, and electrical energy can only be absorbed through the discharge module. If the power battery state of charge does not reach the set value, the original connection state of the fuel cell system and the power battery circuit when shut down can be maintained, and part of the electrical energy can be absorbed through the discharge module to reduce the electrical energy supplied to the power battery, that is, the discharge module shares part of the electrical energy to avoid overcharging of the power battery.

[0061] According to the vehicle control method of an embodiment of the present invention, when the vehicle meets the fuel cell system shutdown triggering conditions, after the hybrid power source system receives the fuel cell system shutdown purge instruction, the fuel cell system performs shutdown purge. When the fuel cell system is shut down and purged, the energy released by 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 and purge stage, thereby preventing the fuel cell stack from overcharging the power battery during the shutdown and purge stage, avoiding accidents caused by overcharging of the power battery, and improving reliability and safety.

[0062] In some embodiments, the vehicle control method further includes: when the vehicle is in a normal driving state, controlling the first switch unit in the hybrid power system to be in an open state, and controlling the second switch unit in the hybrid power system to be in a closed state.

[0063] The first switch unit is located between the discharge unit in the discharge module and the output end of the voltage conversion module in the hybrid power system, and the second switch unit is connected between the output end of the voltage conversion module and the power distribution module in the hybrid power system.

[0064] Specifically, when the vehicle is driving normally, the first switch unit in the hybrid power system is controlled to be in an open state, and the second switch unit in the hybrid power 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 drive system. Since the first switch unit is disconnected, the discharge 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.

[0065] In some embodiments, in response to a fuel cell system shutdown purge instruction, controlling a discharge module of the hybrid power system to start discharging includes: in response to the fuel cell system shutdown purge instruction, controlling a first switch unit of the discharge module to close.

[0066] Specifically, when a fuel cell system shutdown and purge instruction is received and the fuel cell system is shut down and purged, the first switch unit is closed in response to the fuel cell system shutdown and purge instruction. At this time, the electric energy generated by the fuel cell system will be transmitted to the discharge unit through the first switch unit, and the discharge unit will discharge to avoid the electric energy being transmitted to the power battery and overcharging the power battery.

[0067] In some embodiments, the vehicle control method further includes: determining that a shutdown purge phase of the fuel cell system ends, controlling the first switch unit to be disconnected, and controlling the second switch unit to be disconnected.

[0068] Specifically, after the shutdown and purge phase of the fuel cell system is completed, the discharge module no longer needs to discharge. At this time, the first switch unit is controlled to be disconnected to avoid the discharge module consuming electrical energy of the fuel cell system due to the connection of the first switch unit when the fuel cell system works again. At the same time, the second switch unit is controlled to be disconnected. When the fuel cell system works again, the charge state of the power battery is first judged to determine whether the second switch unit can be closed.

[0069] A fourth aspect of the present invention provides an electronic device, such as Figure 5 As shown, the electronic device 300 includes: at least one processor 301 and a memory 302 .

[0070] Among them, at least one processor 301 is communicatively connected with the memory 302, and the memory 302 stores a computer program that can be executed by the at least one processor 301. When the at least one processor 301 executes the computer program, the vehicle control method is implemented.

[0071] According to the electronic device of the embodiment of the present invention, the corresponding vehicle control program can be stored in the memory. When the vehicle control method is implemented, it is determined that the vehicle meets the fuel cell system shutdown trigger condition. After the hybrid power source system receives the fuel cell system shutdown purge instruction, the fuel cell system performs shutdown purge. When the fuel cell system is shut down and purged, the energy released by 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 and purge stage, thereby preventing the fuel cell stack from overcharging the power battery during the shutdown and purge stage, avoiding accidents caused by overcharging of the power battery, and improving reliability and safety.

[0072] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, substrates, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example.

[0073] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A hybrid power source system, characterized in that: include: A fuel cell system, the fuel cell system comprising a fuel cell stack; A power battery, wherein the power battery is connected to the DC bus; a voltage conversion module, wherein an input end of the voltage conversion module is connected to the fuel cell stack, an output end of the voltage conversion module is connected to the DC bus, and 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, the discharge module is connected to the output end of the voltage conversion module and is connected in parallel with the power battery. The discharge module is used to respond to the fuel cell system shutdown purge instruction 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, start discharging to absorb at least part of the energy generated by the fuel cell stack during the shutdown purge stage.

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

3. The hybrid power source system according to claim 2, characterized in that: The hybrid power source system further includes: A power distribution module, wherein the input end of the power distribution module is connected to the output end of the voltage conversion module and the discharge module through the positive DC bus and the negative DC bus, and the first output end 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 operation state; A second switch unit, the second switch unit is arranged on the positive DC bus, the first end of the second switch unit is connected to the output end of the voltage conversion module and the discharge module, the second end of the second switch unit is connected to the input end of the power distribution module, and the second switch unit is used to disconnect in response to the end instruction of the shutdown purge phase or in response to the shutdown purge instruction of the fuel cell system.

4. The hybrid power source system according to claim 3, characterized in that: The fuel cell system further comprises: A fuel cell system controller, the fuel cell system controller is connected to the first switch unit and the second switch unit, and is used to control the switch state of the first switch unit and the second switch unit according to the fuel cell system shutdown purge instruction or the fuel cell system shutdown purge state.

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

6. A vehicle control method, characterized in that: For the hybrid power source system according to any one of claims 1 to 4, the vehicle control method comprises: Determining that 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, wherein the fuel cell system shutdown trigger condition includes that the state of charge of the power battery reaches the charge threshold or the allowable charging power of the power battery is less than the lower limit of the operating power of the fuel cell stack; In response to a fuel cell system shutdown purge instruction, a discharge module of the hybrid power source system is controlled to start discharging to absorb at least part of the energy generated by the fuel cell stack during the shutdown purge phase.

7. The vehicle control method according to claim 6, characterized in that: The vehicle control method further includes: When the vehicle is in a normal driving state, controlling the first switch unit in the hybrid power system to be in an open state, and controlling the second switch unit in the hybrid power system to be in a closed state; The first switch unit is located between the discharge unit in the discharge module and the output end of the voltage conversion module in the hybrid power system, and the second switch unit is connected between the output end of the voltage conversion module and the power distribution module in the hybrid power system.

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

9. The vehicle control method according to claim 8, characterized in that: The vehicle control method further includes: It is determined that the shutdown purge phase of the fuel cell system is ended, the first switch unit is controlled to be disconnected, and the second switch unit is controlled to be disconnected.

10. An electronic device, characterized in that: include: at least one processor; a memory communicatively coupled to the at least one processor; The memory stores a computer program that can be executed by the at least one processor, and when the at least one processor executes the computer program, the vehicle control method according to any one of claims 6 to 9 is implemented.

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