Fuel cell system, control method thereof and electric vehicle

Abstract

The invention relates to a fuel cell system, a control method thereof and an electric vehicle, the fuel cell system is connected with a power system of the electric vehicle, and the fuel cell system comprises a fuel cell, a self-locking unit, a controller and a gas storage unit; the fuel cell system supplies power to the controller through the power cell under the condition that the key switch is closed, so that the controller controls the gas storage unit to execute the starting process after the self-locking unit is closed, and the fuel cell starts to work after the starting process is completed; under the condition that the key switch is disconnected, the fuel cell system supplies power to the controller through the power cell, so that the controller controls the gas storage unit to execute the shutdown process and then controls the self-locking unit to be disconnected, and the fuel cell stops working after the shutdown process is completed. According to the technical scheme provided by the invention, the power system of the two-wheeled electric vehicle is used for supplying power to the power-on process and the power-off process of the gas storage unit, so that a traditional two-wheeled electric vehicle is relatively conveniently transformed.

Description

Technical Field

[0001] The present application relates to the field of fuel cell technology, and in particular to a fuel cell system and a control method thereof, and an electric vehicle. Background Art

[0002] Currently, more and more vehicles use clean energy as their power systems, and two-wheeled electric vehicles powered by fuel cells (such as hydrogen-powered two-wheeled electric vehicles) are one of the more novel products.

[0003] Due to the characteristics of fuel cells, fuel cells require additional power input to execute the startup process and turn on the necessary devices for the fuel cell (such as hydrogen valves, pulse valves, fans, etc.). After completing the startup process, the fuel cell has the ability to carry load. Similarly, after the fuel cell ends the load shutdown, it also requires additional power input to execute the shutdown process to perform operations such as residual hydrogen removal. After completing the shutdown process, the fuel cell can be safely shut down.

[0004] If we want to mass produce hydrogen-powered two-wheeled electric vehicles, installing a fuel cell system on a traditional two-wheeled electric vehicle is a more convenient way. To this end, we hope to propose a fuel cell system that uses the original power system of the traditional two-wheeled electric vehicle to power the fuel cell startup and shutdown processes, thereby realizing a more convenient transformation of the traditional two-wheeled electric vehicle. Summary of the invention

[0005] The present application provides a fuel cell system and a control method thereof, and an electric vehicle, so as to realize a more convenient transformation of a traditional two-wheeled electric vehicle.

[0006] In a first aspect, the present application provides a fuel cell system, wherein the fuel cell system is connected to a power system of an electric vehicle; wherein the power system comprises a motor, a key switch and a power battery, wherein the motor is connected to one end of the key switch, and the other end of the key switch is connected to the power battery;

[0007] The fuel cell system comprises a fuel cell, a self-locking unit, a controller and a gas storage unit, wherein the fuel cell is respectively connected to the power battery, one end of the key switch and one end of the self-locking unit, the other end of the self-locking unit is respectively connected to the controller, the other end of the key switch and the motor, and the controller is connected to the gas storage unit;

[0008] When the key switch of the fuel cell system is closed, the power battery supplies power to the controller through the power battery, so that the controller controls the gas storage unit to execute a startup process after the self-locking unit is closed, and the fuel cell starts to work after the startup process is completed; when the key switch of the fuel cell system is disconnected, the power battery supplies power to the controller through the power battery, so that the controller controls the gas storage unit to execute a shutdown process and then controls the self-locking unit to disconnect, and the fuel cell stops working after the shutdown process is completed.

[0009] In a feasible embodiment of the present application, the fuel cell system further includes a diode;

[0010] The anode of the diode is connected to the motor and one end of the key switch respectively, and the cathode of the diode is connected to the other end of the self-locking unit and the controller respectively.

[0011] In a feasible embodiment of the present application, the fuel cell system further includes a first transformer;

[0012] The voltage input end of the first transformer is respectively connected to the cathode of the diode and the other end of the self-locking unit, and the voltage output end of the first transformer is respectively connected to the controller and the gas storage unit. The first transformer is used to convert the voltage input from the power battery to the controller.

[0013] In a feasible embodiment of the present application, the fuel cell system further includes a voltage detector;

[0014] The voltage detector is connected to the motor and the controller respectively. The voltage detector is used to detect the working voltage of the motor and send the detected value of the working voltage to the controller.

[0015] In a feasible embodiment of the present application, the self-locking unit includes a switch relay;

[0016] The first contact of the high-voltage side of the switch relay is connected to the cathode of the diode and the controller respectively, and the second contact of the high-voltage side of the switch relay is connected to the fuel cell, the power battery and the other end of the key switch respectively;

[0017] The weak current side of the switch relay is connected to the controller;

[0018] After receiving the first switch signal, the switch relay on the weak current side controls the first contact to be disconnected from the second contact; wherein, the first switch signal is generated by the controller after the shutdown process is executed.

[0019] In a feasible embodiment of the present application, the weak current side of the switch relay is also connected to the switch button;

[0020] After receiving the second switch signal, the switch relay controls the first contact to be connected with the second contact on the weak current side; wherein the second switch signal is generated by triggering the switch button.

[0021] In a feasible embodiment of the present application, the first transformer is a wide-input DC-DC voltage transformer, and the voltage input range of the first transformer is 24V-72V.

[0022] In a second aspect, the present application provides a control method for a fuel cell system, the method being applied to a controller of the fuel cell system according to any one of the embodiments of the first aspect, the method comprising:

[0023] After power-on operation, the gas storage unit is controlled to execute the standby process;

[0024] After the self-locking unit is closed, the gas storage unit is controlled to execute a startup process; wherein, after the startup process, the gas storage unit supplies gas to the fuel cell, so that the fuel cell starts to work;

[0025] After the key switch is turned off, a control signal is generated;

[0026] In response to the control signal, the gas storage unit is controlled to execute a shutdown process; wherein, after the shutdown process, the gas storage unit stops supplying gas to the fuel cell, so that the fuel cell stops working;

[0027] A first switch signal is generated and sent to the self-locking unit; wherein the first switch signal is used to control the self-locking unit to disconnect.

[0028] In a feasible embodiment of the present application, after the key switch is closed, a control signal is generated, including:

[0029] Obtain the working voltage of the motor from the voltage detector;

[0030] Determining whether the operating voltage is less than a set threshold;

[0031] When the operating voltage is less than the set threshold, the control signal is generated.

[0032] In a third aspect, the present application provides an electric vehicle, comprising a power system and a fuel cell system as described in any one of the embodiments of the first aspect above.

[0033] The above technical solution provided by the embodiment of the present application has the following advantages compared with the prior art:

[0034] The fuel cell system provided in the embodiment of the present application, after being installed on a traditional two-wheeled electric vehicle, uses the power system of the traditional two-wheeled electric vehicle to power the startup process and shutdown process of the gas storage unit. Without changing the original control logic of the traditional two-wheeled electric vehicle, the fuel cell needs additional power input to execute the startup process and shutdown process, which is more convenient when technicians want to modify the traditional two-wheeled electric vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0036] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0037] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0038] Figure 1 A schematic diagram of the structure of a fuel cell system provided in an embodiment of the present application;

[0039] Figure 2 Another structural schematic diagram of a fuel cell system provided in an embodiment of the present application;

[0040] Figure 3 A schematic diagram of another structure of a fuel cell system provided in an embodiment of the present application;

[0041] Figure 4 A schematic flow chart of a control method for a fuel cell system provided in an embodiment of the present application;

[0042] Figure 5 A detailed step diagram of a control method for a fuel cell system provided in an embodiment of the present application when an electric vehicle is running;

[0043] Figure 6 A schematic diagram of the structure of an electric vehicle provided in an embodiment of the present application.

[0044] Description of reference numerals:

[0045] 1. Fuel cell system; 11. Fuel cell; 12. Self-locking unit; 13. Controller; 14. Gas storage unit; 15. Diode; 16. First transformer; 17. Voltage detector; 18. Switch button; 19. Switch relay; 2. Power system; 21. Motor; 22. Power battery; 23. Key switch; 24. Second transformer. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0047] The disclosure below provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0048] In order to achieve a more convenient transformation of a traditional two-wheeled electric vehicle, the present application provides a fuel cell system and a control method thereof, and an electric vehicle, so that when a fuel cell is installed on a traditional two-wheeled electric vehicle, the control logic of the traditional two-wheeled electric vehicle does not change, which is more convenient.

[0049] Figure 1 A schematic diagram of a fuel cell system 1 provided in an embodiment of the present application, referring to Figure 1 , a fuel cell system 1 provided in an embodiment of the present application is connected to a power system 2 of an electric vehicle.

[0050] The power system 2 includes a motor 21, a key switch 23 and a power battery 22. The motor 21 is connected to one end of the key switch 23, and the other end of the key switch 23 is connected to the power battery 22.

[0051] The fuel cell system 1 includes a fuel cell 11, a self-locking unit 12, a controller 13 and a gas storage unit 14. The fuel cell 11 is respectively connected to a power battery 22, one end of a key switch 23 and one end of the self-locking unit 12. The other end of the self-locking unit 12 is respectively connected to the controller 13, the other end of the key switch 23 and the motor 21. The controller 13 is connected to the gas storage unit 14.

[0052] When the key switch 23 of the fuel cell system 1 is closed, the power battery 22 supplies power to the controller 13, so that the controller 13 controls the gas storage unit 14 to execute the startup process after the self-locking unit 12 is closed, and the fuel cell 11 starts to work after the startup process is completed; when the key switch 23 of the fuel cell system 1 is disconnected, the power battery 22 supplies power to the controller 13, so that the controller 13 controls the gas storage unit 14 to execute the shutdown process and then controls the self-locking unit 12 to be disconnected, and the fuel cell 11 stops working after the shutdown process is completed.

[0053] Specifically, in a conventional two-wheeled electric vehicle, the power system 2 supplies power to the motor 21 through the power battery 22, and the power battery 22 is connected to the motor 21 through the key switch 23. When the driver inserts the key to start the two-wheeled electric vehicle, the key switch 23 is closed, the power battery 22 supplies power to the motor 21, and the two-wheeled electric vehicle can start to travel; when the driver pulls out the key to turn off the two-wheeled electric vehicle, the key switch 23 is disconnected, and the power battery 22 stops supplying power to the motor 21. In the present application, the power system 2 of the electric vehicle is completely consistent with the power system 2 of the conventional two-wheeled electric vehicle, and basic control is achieved based on the key switch 23.

[0054] In the power system 2 of some conventional two-wheeled electric vehicles, a transformer (such as Figure 1 The second transformer 24 in the power supply circuit 21 is used to convert the voltage output by the power battery 22 to ensure the normal operation of the motor 21.

[0055] The fuel cell system 1 includes a fuel cell 11, a self-locking unit 12, a controller 13 and a gas storage unit 14, wherein the fuel cell 11 is respectively connected to a power battery 22, one end of a key switch 23 and one end of the self-locking unit 12, the other end of the self-locking unit 12 is respectively connected to the controller 13, the other end of the key switch 23 and the motor 21, and the controller 13 is connected to the gas storage unit 14.

[0056] The self-locking unit 12 in the fuel cell system 1 can accept external control from the driver, and can be specifically connected to a button installed on the electric vehicle, so that the driver can control the switch state of the self-locking unit 12 by triggering the button. For example, when the driver presses the button, the self-locking unit 12 is closed; when the driver pops the button, the self-locking unit 12 is disconnected. At the same time, the self-locking unit 12 can also accept control from the controller 13, and the controller 13 can control the switch state of the self-locking unit 12 by sending a specific signal to the self-locking unit 12.

[0057] The controller 13 in the fuel cell system 1 can realize the control of the gas storage unit 14 and the control of the self-locking unit 12. In the present application, when the key switch 23 is closed, the controller 13 is powered on, and after being powered on, the controller 13 controls the gas storage unit 14 to execute the standby process, waiting for the self-locking unit 12 to be closed; when the self-locking unit 12 is closed, the controller 13 controls the gas storage unit 14 to execute the startup process, performs self-inspection on the components in the gas storage unit 14, and after the startup process is completed, the gas storage unit 14 supplies gas to the fuel cell 11, and the fuel cell 11 starts to work.

[0058] In the present application, when the key switch 23 is disconnected, the controller 13 detects that the key switch 23 is disconnected, and controls the gas storage unit 14 to execute the shutdown process. After completing the shutdown process, the gas storage unit 14 no longer supplies gas to the fuel cell 11, and the fuel cell 11 stops working; after the fuel cell 11 stops working, the controller 13 controls the self-locking unit 12 to disconnect.

[0059] based on Figure 1 It can be seen from the structural diagram and the control logic of the above-mentioned controller 13 that when only the key switch 23 is closed, the motor 21 is powered only by the power battery 22; when the key switch 23 and the self-locking switch are closed at the same time, the fuel cell 11 and the power battery 22 simultaneously power the motor 21; when the key switch 23 is disconnected, both the fuel cell 11 and the power battery 22 stop powering the motor 21; when only the self-locking unit 12 is disconnected, the power battery 22 still powers the motor 21, but the fuel cell 11 no longer powers the motor 21.

[0060] Based on the above embodiments, when a conventional two-wheeled electric vehicle is equipped with a fuel cell system 1 provided by the present application, the driver does not need to change the existing control logic, and can control the working mode of the electric vehicle through the key switch 23 and the self-locking unit 12. At the same time, the fuel cell system 1 provided by the present application directly uses the power battery 22 in the original power system 2 to power the startup process and shutdown process of the gas storage unit 14, meeting the characteristics of the fuel cell 11. Through the technical solution provided by the present application, a relatively convenient transformation of a conventional two-wheeled electric vehicle can be achieved.

[0061] Reference Figure 2 In a feasible embodiment of the present application, the fuel cell system 1 also includes a diode 15; the positive electrode of the diode 15 is respectively connected to the motor 21 and one end of the key switch 23, and the negative electrode of the diode 15 is respectively connected to the other end of the self-locking unit 12 and the controller 13.

[0062] By providing the diode 15, after the key switch 23 is turned off, the fuel cell 11 cannot supply power to the motor 21 due to the characteristic of the diode 15 that prevents current from flowing in reverse. If the driver wants the electric vehicle to stop working, he only needs to pull out the key to close the key switch 23, which is consistent with the existing control logic.

[0063] Continue to refer to Figure 2 In a feasible embodiment of the present application, the fuel cell system 1 also includes a first transformer 16; the voltage input end of the first transformer 16 is respectively connected to the cathode of the diode 15 and the other end of the self-locking unit 12, and the voltage output end of the first transformer 16 is respectively connected to the controller 13 and the gas storage unit 14, and the first transformer 16 is used to convert the voltage input from the power battery 22 to the controller 13.

[0064] In a feasible embodiment of the present application, the first transformer 16 is a wide input DC-DC voltage transformer, and the voltage input range of the first transformer 16 is 24V-72V.

[0065] At present, the voltage of the power battery 22 of common electric vehicles on the market is usually between 24V and 72V, and the rated voltage of the controller 13 cannot work in such a high voltage range. By setting the first transformer 16, the voltage input from the power battery 22 to the controller 13 is converted to ensure that the controller 13 can work normally. At the same time, the first transformer 16 is set as a wide input DC-DC voltage transformer, which can adapt to most electric vehicles, so that the compatibility of a fuel cell system 1 provided in this application is better.

[0066] Continue to refer to Figure 2 In a feasible embodiment of the present application, the fuel cell system 1 also includes a voltage detector 17; the voltage detector 17 is connected to the motor 21 and the controller 13 respectively, and the voltage detector 17 is used to detect the working voltage of the motor 21 and to send the detection value of the working voltage to the controller 13.

[0067] Based on the control logic of the controller 13 described in the above embodiment, the controller 13 determines how to control the gas storage unit 14 based on the switch state of the key switch 23. The controller 13 can determine whether the key switch 23 is closed by whether it is powered on (if the key switch 23 is closed, the power battery 22 can supply power to the controller 13, and the controller 13 is powered on and operated; conversely, if the key switch 23 is disconnected, the power battery 22 cannot supply power to the controller 13, and the controller 13 is not powered on and operated), but it is difficult to detect whether the key switch 23 is disconnected.

[0068] By setting a voltage detector 17 at the motor 21, the working voltage of the motor 21 can be determined in real time, thereby determining whether the motor 21 is working. When the motor 21 is working, it means that the power battery 22 alone or together with the fuel cell 11 supplies power to the motor 21. At this time, the key switch 23 must be closed, and the working voltage of the motor 21 detected by the voltage detector 17 is the rated working voltage of the motor 21; when the motor 21 stops working, the key switch 23 must be disconnected, and the working voltage of the motor 21 detected by the voltage detector 17 is 0. Therefore, the controller 13 can detect the switch state of the key switch 23 by identifying the working voltage of the motor 21.

[0069] Reference Figure 3 In a feasible embodiment of the present application, the self-locking unit 12 includes a switch relay 19; the first contact of the strong current side of the switch relay 19 is respectively connected to the cathode of the diode 15 and the controller 13, and the second contact of the strong current side of the switch relay 19 is respectively connected to the fuel cell 11, the power battery 22 and the other end of the key switch 23;

[0070] The weak current side of the switch relay 19 is connected to the controller 13;

[0071] After receiving the first switch signal, the switch relay 19 on the weak current side controls the first contact to be disconnected from the second contact; wherein the first switch signal is generated by the controller 13 after the shutdown process is completed.

[0072] Continue to refer to Figure 3 The weak current side of the switch relay 19 is also connected to the switch button 18; after receiving the second switch signal on the weak current side, the switch relay 19 controls the first contact to be connected to the second contact; wherein the second switch signal is triggered by the switch button 18.

[0073] Specifically, whether the first contact and the second contact of the switch relay 19 are closed is controlled by the strong power side of the switch relay 19. In the technical solution provided in the present application, when the strong power side of the switch relay 19 receives the first switch signal, the first contact and the second contact are disconnected; when the strong power side of the switch relay 19 receives the second switch signal, the first contact and the second contact are closed.

[0074] The first switch signal may be generated by the controller 13, and the controller 13 generates the first switch signal after controlling the gas storage unit 14 to execute the shutdown process. The first switch signal may also be generated by triggering the switch button 18. For example, if the self-locking unit 12 is closed after the driver presses the switch button 18, the first switch signal is generated when the switch button 18 is converted from the pop-up state to the pressed state. The second switch signal is generated by triggering the switch button 18. For example, if the self-locking unit 12 is disconnected after the driver flips the switch button 18, the second switch signal is generated when the switch button 18 is converted from the pressed state to the pop-up state.

[0075] Combining all the above embodiments and Figure 3 , the working process of a fuel cell system 1 provided in the present application is described in detail.

[0076] After the driver inserts the key to start the electric vehicle, the power battery 22 is connected to the motor 21, and the power battery 22 supplies power to the motor 21, so that the driver can drive normally. At the same time, the power battery 22 also supplies power to the controller 13 through the key switch 23-diode 15; after the controller 13 is powered on, it starts to control the gas storage device to execute the standby process, and the gas storage device enters the standby state and can start working at any time; when the driver expects to power the motor 21 through the fuel cell 11 and the power battery 22 at the same time, press the switch button 18 to generate a second switch signal, and the self-locking unit 12 is closed. At this time, the controller 13 controls the gas storage unit 14 to execute the startup process. After completing the startup process, the gas storage unit 14 normally supplies gas to the fuel cell 11, and the fuel cell 11 starts working and supplies power to the motor 21 together with the power battery 22.

[0077] After the driver pulls out the key to stop the electric vehicle, the power battery 22 is disconnected from the motor 21, and the power battery 22 only supplies power to the controller 13. At the same time, the controller 13 also detects that the operating voltage of the motor 21 becomes 0. At this time, the controller 13 controls the gas storage unit 14 to execute the shutdown process. After the shutdown process is completed, the fuel cell 11 stops working. In addition, after the shutdown process is completed, the controller 13 also generates a first switch signal to control the self-locking unit 12 to disconnect and restore to the initial state.

[0078] In addition, since the controller 13 controls the gas storage unit 14 to execute the shutdown process after detecting that the self-locking unit 12 is disconnected, when the key switch 23 is closed, the driver can also turn off the self-locking unit 12 through the switch button 18, thereby stopping the fuel cell 11 from supplying power to the motor 21, and only supplying power to the motor 21 through the power battery 22.

[0079] In addition, since the controller 13 can control the gas storage device to perform the standby process and the startup process only after being powered on, when the key switch 23 is disconnected, the energy storage battery cannot be turned on by the switch button 18.

[0080] In order to realize the control of a fuel cell system 1 provided in the above embodiment, the embodiment of the present application further provides a control method of the fuel cell system 1 , which is applied to the controller 13 of the fuel cell system 1 . Figure 4 A flow chart of a control method of a fuel cell system 1 provided in an embodiment of the present application, referring to Figure 4 A fuel cell system 1 provided in an embodiment of the present application specifically includes the following steps:

[0081] S1: After power-on, control the gas storage unit 14 to execute the standby process;

[0082] S2: After the self-locking unit 12 is closed, the gas storage unit 14 is controlled to execute a startup process; wherein, after the startup process, the gas storage unit 14 supplies gas to the fuel cell 11, so that the fuel cell 11 starts to work;

[0083] S3: after the key switch 23 is turned off, a control signal is generated;

[0084] S4: in response to the control signal, controlling the gas storage unit 14 to execute a shutdown process; wherein, after the shutdown process, the gas storage unit 14 stops supplying gas to the fuel cell 11, so that the fuel cell 11 stops working;

[0085] S5: Generate a first switch signal, and send the first switch signal to the self-locking unit 12; wherein the first switch signal is used to control the self-locking unit 12 to disconnect.

[0086] In a feasible embodiment of the present application, after the key switch 23 is closed, generating a control signal includes:

[0087] Obtaining the operating voltage of the motor 21 from the voltage detector 17;

[0088] Determine whether the operating voltage is less than the set threshold;

[0089] When the operating voltage is less than the set threshold, a control signal is generated.

[0090] In a feasible embodiment of the present application, the threshold value may be set to 50% of the rated working voltage of the motor 21 .

[0091] In another feasible embodiment of the present application, after the key switch 23 is closed, generating a control signal may further include:

[0092] Obtaining the operating voltage of the motor 21 from the voltage detector 17;

[0093] Detect whether the change value of the working voltage of the motor 21 at any two adjacent moments is greater than a set change value threshold;

[0094] When the change value of the working voltage of the motor 21 is greater than the set change value threshold at any two adjacent moments, a control signal is generated.

[0095] Figure 5 A detailed step diagram of a control method of a fuel cell system 1 provided in an embodiment of the present application when an electric vehicle is running, refer to Figure 5 In some examples, the detailed steps of a control method of a fuel cell system 1 provided in an embodiment of the present application when an electric vehicle is running are as follows:

[0096] S501: After the key switch 23 is closed, the controller 13 is powered on, and the gas storage unit 14 is controlled by the controller 13 to execute the standby process;

[0097] S502: Real-time detection of the switch state of the self-locking unit 12 to determine whether the self-locking unit 12 is closed; if so, jump to step S503; if not, jump to step S501;

[0098] S503: Control the gas storage unit 14 to execute the startup process;

[0099] S504: the gas storage unit 14 starts to supply power to the fuel cell 11, and the fuel cell 11 operates normally;

[0100] S505: Real-time detection of the working voltage of the motor 21 to determine whether the working voltage of the motor 21 is less than a set threshold; if so, jump to step S509; if not, jump to step S506;

[0101] S506: Detecting the switch state of the self-locking unit 12 to determine whether the self-locking unit 12 is disconnected; if so, jump to step S507; if not, jump to step S504;

[0102] S507: Generate a control signal to control the gas storage unit 14 to execute a shutdown process;

[0103] S508: After the gas storage unit 14 completes the shutdown process, the fuel cell 11 stops working;

[0104] S509: Generate a control signal to control the gas storage unit 14 to execute a shutdown process;

[0105] S510: Generate a first switch signal to disconnect the self-locking unit 12 and restore the initial state.

[0106] In another aspect, an embodiment of the present application also provides an electric vehicle. Figure 6 A schematic diagram of the structure of an electric vehicle provided in an embodiment of the present application, referring to Figure 6 An electric vehicle provided in an embodiment of the present application includes a power system 2 and a fuel cell system 1 of any one of the above embodiments.

[0107] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0108] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A fuel cell system, characterized in that: The fuel cell system is connected to a power system of an electric vehicle; wherein the power system includes a motor, a key switch and a power battery, the motor is connected to one end of the key switch, and the other end of the key switch is connected to the power battery; The fuel cell system comprises a fuel cell, a self-locking unit, a controller and a gas storage unit, wherein the fuel cell is respectively connected to the power battery, one end of the key switch and one end of the self-locking unit, the other end of the self-locking unit is respectively connected to the controller, the other end of the key switch and the motor, and the controller is connected to the gas storage unit; When the key switch of the fuel cell system is closed, the power battery supplies power to the controller through the power battery, so that the controller controls the gas storage unit to execute a startup process after the self-locking unit is closed, and the fuel cell starts to work after the startup process is completed; when the key switch of the fuel cell system is disconnected, the power battery supplies power to the controller through the power battery, so that the controller controls the gas storage unit to execute a shutdown process and then controls the self-locking unit to disconnect, and the fuel cell stops working after the shutdown process is completed.

2. The fuel cell system according to claim 1, characterized in that: The fuel cell system also includes a diode; The anode of the diode is connected to the motor and one end of the key switch respectively, and the cathode of the diode is connected to the other end of the self-locking unit and the controller respectively.

3. The fuel cell system according to claim 2, characterized in that: The fuel cell system also includes a first transformer; The voltage input end of the first transformer is respectively connected to the cathode of the diode and the other end of the self-locking unit, and the voltage output end of the first transformer is respectively connected to the controller and the gas storage unit. The first transformer is used to convert the voltage input from the power battery to the controller.

4. The fuel cell system according to claim 1, characterized in that: The fuel cell system further includes a voltage detector; The voltage detector is connected to the motor and the controller respectively. The voltage detector is used to detect the working voltage of the motor and send the detected value of the working voltage to the controller.

5. The fuel cell system according to claim 2, characterized in that: The self-locking unit includes a switch relay; The first contact of the high-voltage side of the switch relay is connected to the cathode of the diode and the controller respectively, and the second contact of the high-voltage side of the switch relay is connected to the fuel cell, the power battery and the other end of the key switch respectively; The weak current side of the switch relay is connected to the controller; After receiving the first switch signal, the switch relay on the weak current side controls the first contact to be disconnected from the second contact; wherein, the first switch signal is generated by the controller after the shutdown process is executed.

6. The fuel cell system according to claim 5, characterized in that: The weak current side of the switch relay is also connected to the switch button; After receiving the second switch signal, the switch relay controls the first contact to be connected with the second contact on the weak current side; wherein the second switch signal is generated by triggering the switch button.

7. The fuel cell system according to claim 3, characterized in that: The first transformer is a wide-input DC-DC voltage transformer, and the voltage input range of the first transformer is 24V-72V.

8. A control method for a fuel cell system, characterized in that: The method is applied to a controller of a fuel cell system according to any one of claims 1 to 7, and the method comprises: After power-on operation, the gas storage unit is controlled to execute the standby process; After the self-locking unit is closed, the gas storage unit is controlled to execute a startup process; wherein, after the startup process, the gas storage unit supplies gas to the fuel cell, so that the fuel cell starts to work; After the key switch is turned off, a control signal is generated; In response to the control signal, the gas storage unit is controlled to execute a shutdown process; wherein, after the shutdown process, the gas storage unit stops supplying gas to the fuel cell, so that the fuel cell stops working; A first switch signal is generated and sent to the self-locking unit; wherein the first switch signal is used to control the self-locking unit to disconnect.

9. The control method of the fuel cell system according to claim 8, characterized in that: After the key switch is closed, control signals are generated, including: Obtain the working voltage of the motor from the voltage detector; Determining whether the operating voltage is less than a set threshold; When the operating voltage is less than the set threshold, the control signal is generated.

10. An electric vehicle, characterized in that: The electric vehicle comprises a power system and a fuel cell system as described in any one of claims 1-7.

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