Fuel cell system, control method thereof, and electric vehicle

Abstract

The application relates to a fuel cell system and a control method thereof, and an electric vehicle, the fuel cell system being connected with a power system of the electric vehicle, the fuel cell system comprising a fuel cell, a self-locking unit, a controller and a gas storage unit; in the case that a key switch is turned on, the controller is powered by a power battery, so that the controller controls the gas storage unit to execute a starting process after the self-locking unit is closed, and the fuel cell starts to work after the starting process is completed; in the case that the key switch is turned off, the controller is powered by the power battery, so that the controller controls the self-locking unit to be turned off after the gas storage unit executes a shutdown process, and the fuel cell stops working after the shutdown process is completed. According to the technical scheme, the power system of the two-wheeled electric vehicle is used to supply power for the starting process and the shutdown process of the gas storage unit, so that the traditional two-wheeled electric vehicle is 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 recent products.

[0003] Due to the characteristics of fuel cells, they require additional power input to start up and activate essential components (such as the hydrogen valve, pulse valve, and fan). Only after completing the startup process can the fuel cell be loaded. Similarly, after the fuel cell stops operating under load, it also requires additional power input to shut down and purge any remaining hydrogen. Only after completing the shutdown process can the fuel cell be safely shut down.

[0004] If we hope to mass-produce hydrogen-powered two-wheeled electric vehicles, retrofitting them with fuel cell systems is a relatively convenient approach. To this end, we propose a fuel cell system that uses the existing power system of the traditional two-wheeled electric vehicle to power the fuel cell during startup and shutdown, thus achieving a relatively convenient retrofit 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 includes 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 includes a fuel cell, a self-locking unit, a controller, and a gas storage unit. 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. 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 completing the startup process; 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 completing the shutdown process.

[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 negative electrode 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 by 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 strong current side of the switch relay is connected to the cathode of the diode and the controller respectively, and the second contact of the strong current 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] The switch relay on the weak current side controls the first contact and the second contact to be disconnected after receiving the first switch signal; wherein, the first switch signal is generated by the controller after the shutdown process is completed.

[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] The switch relay controls the connection between the first contact and the second contact after receiving the second switch signal 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 method for controlling a fuel cell system, the method being applied to the controller of the fuel cell system according to any one of the embodiments of the first aspect, the method comprising:

[0023] After power-on, 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, controlling the gas storage unit to execute a shutdown process; wherein, after the shutdown process, the gas storage unit stops supplying gas to the fuel cell, causing the fuel cell to stop 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 be disconnected.

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

[0029] Obtain the operating 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 embodiments of the present application, when installed on a conventional two-wheeled electric vehicle, utilizes the power system of the conventional two-wheeled electric vehicle to power the gas storage unit during startup and shutdown. Without changing the original control logic of the conventional two-wheeled electric vehicle, the fuel cell's requirement for additional power input to execute startup and shutdown procedures is met, making it more convenient for technicians to modify conventional two-wheeled electric vehicles. 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 following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0037] One or more embodiments are exemplarily illustrated by pictures in the corresponding drawings. These exemplifications do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements. Unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

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

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

[0043] Figure 6 A schematic structural diagram 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] To make the objects, technical solutions, and advantages of the embodiments of the present application clearer, the following will be combined with the accompanying drawings for the embodiments of the present application to make a clear and complete description of the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0047] The following disclosure provides many different embodiments or examples for implementing different structures of the present application. In order to simplify the disclosure of the present application, the components and settings of specific examples are described in the following. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeatedly refer to the numbers and / or letters in different examples. Such repetition is for the purpose of simplification and clarity, and it does not indicate the relationship between the various embodiments and / or settings discussed.

[0048] In order to be able to realize the relatively convenient reform of the traditional two-wheeled electric vehicle, the present application provides a fuel cell system and its control method, electric vehicle, so that when the fuel cell is installed on the traditional two-wheeled electric vehicle, the control logic of the traditional two-wheeled electric vehicle is not changed, and it is relatively convenient.

[0049] Figure 1 A structural schematic diagram of a fuel cell system 1 provided by the embodiments of the present application is shown in Figure 1 The fuel cell system 1 provided by the embodiments of the present application is connected with the power system 2 of the electric vehicle.

[0050] Among them, the power system 2 includes a motor 21, a key switch 23, and a power battery 22, the motor 21 is connected with one end of the key switch 23, and the other end of the key switch 23 is connected with 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 connected with the power battery 22, one end of the key switch 23, and one end of the self-locking unit 12 respectively, the other end of the self-locking unit 12 is connected with the controller 13, the other end of the key switch 23, and the motor 21 respectively, and the controller 13 is connected with 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 disconnect, and the fuel cell 11 stops working after the shutdown process is completed.

[0053] Specifically, in a traditional two-wheeled electric vehicle, the power system 2 supplies power to the motor 21 via a power battery 22, which is connected to the motor 21 via a key switch 23. When the driver inserts the key to start the two-wheeled electric vehicle, the key switch 23 closes, the power battery 22 supplies power to the motor 21, and the two-wheeled electric vehicle begins to travel. When the driver removes the key to turn off the two-wheeled electric vehicle, the key switch 23 opens, and the power battery 22 stops supplying power to the motor 21. In this application, the power system 2 of the electric vehicle is exactly the same as the power system 2 of a traditional two-wheeled electric vehicle, and basic control is achieved based on the key switch 23.

[0054] In the power system 2 of some traditional 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 the power battery 22, one end of the 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 is capable of receiving external control from the driver. Specifically, it can be connected to a button installed on the electric vehicle. The driver can control the on / off 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 releases the button, the self-locking unit 12 is opened. The self-locking unit 12 can also be controlled by the controller 13, which can control the on / off state of the self-locking unit 12 by sending specific signals to the self-locking unit 12.

[0057] The controller 13 in the fuel cell system 1 is capable of controlling the gas storage unit 14 and the self-locking unit 12. In the present application, when the key switch 23 is closed, the controller 13 is powered on. After powering on, the controller 13 controls the gas storage unit 14 to execute a standby process, waiting for the self-locking unit 12 to close. When the self-locking unit 12 is closed, the controller 13 controls the gas storage unit 14 to execute a power-on process, performing a self-check on the components in the gas storage unit 14. After the power-on process is completed, the gas storage unit 14 supplies gas to the fuel cell 11, and the fuel cell 11 begins to operate.

[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 From the structural diagram and the control logic of the above-mentioned controller 13, it can be seen 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 embodiment, when a conventional two-wheeled electric vehicle is equipped with a fuel cell system 1 provided by this application, the driver can control the operating mode of the electric vehicle through the key switch 23 and the self-locking unit 12 without changing the existing control logic. At the same time, the fuel cell system 1 provided by this application directly uses the power battery 22 in the original power system 2 to power the gas storage unit 14 during the startup and shutdown processes, meeting the characteristics of the fuel cell 11. The technical solution provided by this application can achieve a relatively convenient modification of conventional two-wheeled electric vehicles.

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

[0062] By providing diode 15, when key switch 23 is turned off, fuel cell 11 cannot power motor 21 due to the diode 15's characteristic of preventing reverse current flow. If the driver wishes to stop the electric vehicle, he or she only needs to remove the key to close key switch 23, which is consistent with 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 negative electrode 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. 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] Currently, the voltage of the power battery 22 of common electric vehicles on the market is generally between 24V and 72V, while the rated voltage of the controller 13 cannot operate in such a high voltage range. By providing a first transformer 16, the voltage input from the power battery 22 to the controller 13 is converted to ensure that the controller 13 can operate normally. At the same time, the first transformer 16 is configured as a wide-input DC-DC voltage transformer, which can adapt to most electric vehicles, making the fuel cell system 1 provided in this application more compatible.

[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 on / off 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 power the controller 13 and the controller 13 is powered on and running; conversely, if the key switch 23 is off, the power battery 22 cannot power the controller 13 and the controller 13 is not powered on and running). However, detecting whether the key switch 23 is off is more difficult.

[0068] By setting the voltage detector 17 at the motor 21, the working voltage of the motor 21 can be determined in real time, so as to determine whether the motor 21 is working. When the motor 21 is working, it is indicated 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 is necessarily 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, at this time the key switch 23 is necessarily opened, and the working voltage of the motor 21 detected by the voltage detector 17 is 0. Therefore, the controller 13 can realize the detection of the switching state of the key switch 23 by identifying the working voltage of the motor 21.

[0069] With reference to Figure 3 In an embodiment of the 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 connected with the negative pole of the diode 15 and the controller 13 respectively, and the second contact of the strong current side of the switch relay 19 is connected with the fuel cell 11, the power battery 22 and the other end of the key switch 23 respectively.

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

[0071] The switch relay 19 controls the first contact and the second contact to be disconnected after receiving the first switching signal at the weak current side; wherein the first switching signal is generated by the controller 13 after the shutdown process is completed.

[0072] With reference to Figure 3 The weak current side of the switch relay 19 is also connected with the switch button 18; the switch relay 19 controls the first contact and the second contact to be connected after receiving the second switching signal at the weak current side; wherein the second switching signal is triggered and generated 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 current side of the switch relay 19. In the technical solution provided in the application, when the strong current side of the switch relay 19 receives the first switching signal, the first contact and the second contact are disconnected; when the strong current side of the switch relay 19 receives the second switching signal, the first contact and the second contact are closed.

[0074] The first switch signal can be generated by the controller 13 after the controller 13 controls the gas storage unit 14 to complete the shutdown process. The first switch signal can also be triggered by the switch button 18. For example, if the self-locking unit 12 is closed when the driver presses the switch button 18, the first switch signal is generated when the switch button 18 transitions from the pop-up state to the pressed state. The second switch signal can also be triggered by the switch button 18. For example, if the self-locking unit 12 is disconnected when the driver releases the switch button 18, the second switch signal is generated when the switch button 18 transitions 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 this 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, he presses 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 the 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 The fuel cell system 1 provided in the 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, the gas storage unit 14 is controlled 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 be disconnected.

[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 set threshold may be set to 50% of the rated operating voltage of the motor 21 .

[0091] In another feasible embodiment of the present application, after the key switch 23 is closed, generating the 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 operating 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 This is 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: Detect the working voltage of the motor 21 in real time 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 it to an 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 according to any one of the above embodiments.

[0107] It should be understood that the terms used herein are for the purpose of describing specific example embodiments only 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 "comprise", "include", "contain" and "have" are inclusive and therefore specify the presence of stated features, steps, operations, elements and / or parts, but do not exclude the presence 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 to be construed as necessarily requiring them to be performed in the specific order described or illustrated, unless the order of execution is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0108] The foregoing is merely a list of specific embodiments of the present application, intended to enable those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the broadest scope consistent with the principles and novel features of the present application.

Claims

1. A fuel cell system, characterized in that: The fuel cell system is connected to the power system of the 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 includes a fuel cell, a self-locking unit, a controller, and a gas storage unit. 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. 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 completing the startup process; 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 completing the shutdown process.

2. The fuel cell system according to claim 1, wherein: The fuel cell system further 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, wherein: The fuel cell system further includes a first transformer; The voltage input end of the first transformer is respectively connected to the negative electrode 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 by the power battery to the controller.

4. The fuel cell system according to claim 1, wherein: 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, wherein: The self-locking unit includes a switch relay; The first contact of the strong current side of the switch relay is connected to the cathode of the diode and the controller respectively, and the second contact of the strong current 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; The switch relay on the weak current side controls the first contact and the second contact to be disconnected after receiving the first switch signal; wherein, the first switch signal is generated by the controller after the shutdown process is completed.

6. The fuel cell system according to claim 5, wherein: The weak current side of the switch relay is also connected to the switch button; The switch relay controls the connection between the first contact and the second contact after receiving the second switch signal 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, wherein: 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 method for controlling a fuel cell system, characterized in that: The method is applied to the controller of the fuel cell system according to any one of claims 1 to 7, and the method includes: After power-on, 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, controlling the gas storage unit to execute a shutdown process; wherein, after the shutdown process, the gas storage unit stops supplying gas to the fuel cell, causing the fuel cell to stop 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 be disconnected.

9. The fuel cell system control method according to claim 8, characterized in that: After the key switch is closed, control signals are generated, including: Obtain the operating 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 according to any one of claims 1 to 7.

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