Power supply management system for fuel cell system of vehicle and fuel cell system

Abstract

A power supply management system for a fuel cell system of a vehicle includes a first power supply unit configured to be adapted to supply power at a first voltage; the vehicle control unit is electrically connected with the first power supply unit and is configured to be suitable for controlling operation of the vehicle at the first voltage; a fuel cell control unit configured to be suitable for controlling operation of the fuel cell system at a second voltage different from the first voltage; a first switching element selectively connecting or disconnecting an electrical connection between the fuel cell control unit and the vehicle control unit and configured to be suitable for transmitting a control signal of the vehicle control unit to the fuel cell control unit; and the first voltage conversion device is electrically connected with the fuel cell control unit through the first voltage conversion device, and the first voltage conversion device is configured to be suitable for being controlled by a vehicle control unit to convert the first voltage into the second voltage.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of fuel cells, in particular to a power supply management system for a fuel cell system of a vehicle. Furthermore, the present application relates to a fuel cell system of a vehicle. BACKGROUND

[0002] With the development of new energy technology, fuel cells are increasingly widely used in vehicles. In a fuel cell vehicle, both a vehicle control unit (VCU) and a fuel cell control unit (FCCU) of a fuel cell system need a low-voltage power supply. Usually, a low-voltage battery is configured in the vehicle, which provides a low-voltage voltage, for example, a 24V voltage, for the vehicle control unit and the fuel cell control unit. Therefore, the vehicle control unit and the fuel cell control unit are designed to operate at the same voltage.

[0003] However, if the operating voltage of the vehicle control unit and the operating voltage of the fuel cell control unit are designed to be different, the fuel cell control unit cannot work normally and may also be damaged.

[0004] In addition, a manual switch is provided between the low-voltage battery and the fuel cell control unit, which is used to reduce the static current and shut down the vehicle in the event of an emergency failure. However, if the manual switch is accidentally or prematurely disconnected, the fuel cell system loses the low-voltage power supply and thus cannot complete the shutdown process. This may cause the water flooding of the stack and the risk of reverse voltage in the next driving cycle. In particular, too high voltage remains in the high-voltage bus, and the stack cannot be protected and poses a high-voltage safety hazard.

[0005] In addition, if the manual switch remains connected for a long time after the vehicle power supply is turned off, the fuel cell control unit and the auxiliary system (BoP) continue to consume the power of the low-voltage battery due to static power consumption, so that the low-voltage battery is insufficient and the vehicle cannot complete the next start.

[0006] Therefore, there is still a need to improve the above technical solutions in view of the many deficiencies in the prior art. INVENTION CONTENTS

[0007] In order to overcome any one of the above-mentioned shortcomings and / or other possible shortcomings of the prior art not mentioned herein, the purpose of the present application is to provide a power supply management system for a fuel cell system of a vehicle and a fuel cell system.

[0008] According to a first aspect of the present application, a power supply management system for a fuel cell system of a vehicle is provided, the power supply management system comprising:

[0009] a first power supply unit configured to supply power at a first voltage;

[0010] a vehicle control unit electrically connected to the first power supply unit and configured to control operation of the vehicle at the first voltage;

[0011] a fuel cell control unit configured to control operation of the fuel cell system at a second voltage different from the first voltage;

[0012] a first switching element selectively connecting or disconnecting an electrical connection between the fuel cell control unit and the vehicle control unit and configured to transmit a control signal of the vehicle control unit to the fuel cell control unit; and

[0013] a first voltage conversion device via which the first power supply unit is electrically connected to the fuel cell control unit, and the first voltage conversion device is configured to convert the first voltage to the second voltage under control of the vehicle control unit.

[0014] The basic idea of the present application is that the vehicle control unit and the fuel cell control unit operate at different low voltages. In the low voltage platform of the vehicle, the voltage conversion device is provided to convert the voltage from the low voltage power supply, such as a low voltage battery, to the voltage suitable for the operation of the fuel cell control unit, thereby ensuring that the low voltage power supply can supply power to the vehicle control unit and the fuel cell control unit at the same time. In addition, the voltage conversion device can be controlled by the vehicle control unit to operate or be deactivated, thereby reliably ensuring the wake-up and power supply of the fuel cell control unit and thus ensuring the control of the fuel cell system by the fuel cell control unit.

[0015] Advantageous configurations of the technical solution of the present application can be obtained from the following optional embodiments.

[0016] According to one optional embodiment of the power supply management system of the present application, the power supply management system further comprises a second switching element and a second power supply unit, the second power supply unit being configured to supply power at the second voltage, and the second switching element selectively connecting or disconnecting an electrical connection between the second power supply unit and the fuel cell control unit.

[0017] According to an optional embodiment of the power supply management system of the present application, the first power supply unit is electrically connected to the second power supply unit through the first voltage conversion device and charges the second power supply unit under the control of the vehicle control unit.

[0018] According to an optional embodiment of the power supply management system of the present application, the second voltage is provided for the fuel cell control unit by the first power supply unit via the first voltage conversion device or by the second power supply unit, for the wake-up function and / or power supply function of the fuel cell control unit.

[0019] According to an optional embodiment of the power supply management system of the present application, the first voltage is greater than or less than the second voltage.

[0020] According to an optional embodiment of the power supply management system of the present application, the first power supply unit and the second power supply unit are configured as low-voltage power supply units.

[0021] According to an optional embodiment of the power supply management system of the present application, the power supply management system further comprises a third power supply unit, an auxiliary device unit, and a second voltage conversion device, the third power supply unit is electrically connected to the auxiliary device unit, and the third power supply unit and the auxiliary device unit are respectively electrically connected to the first power supply unit via the second voltage conversion device, wherein the third power supply unit is configured as a high-voltage power supply unit and supplies power at a third voltage, and the second voltage conversion device is configured as a step-down DC-DC converter or a step-up / step-down DC-DC converter and is adapted to convert the third voltage to the first voltage.

[0022] According to an optional embodiment of the power supply management system of the present application, in the case that the second power supply unit supplies power to the fuel cell control unit and the second switch element is suddenly turned off, the first voltage conversion device converts the first voltage of the first power supply unit to the second voltage and supplies power to the fuel cell control unit under the control of the vehicle control unit.

[0023] According to an optional embodiment of the power supply management system of the present application, the first switch element is configured as a relay or a transistor.

[0024] According to an optional embodiment of the power supply management system of the present application, the second switch element is configured as a manual switch.

[0025] According to an optional embodiment of the power supply management system of the present application, the first voltage conversion device is configured as a step-up DC-DC converter or a step-up / step-down DC-DC converter.

[0026] According to an optional embodiment of the power supply management system of the present application, the vehicle control unit controls the first voltage conversion device to operate after the vehicle key is plugged in.

[0027] According to an optional embodiment of the power supply management system of the present application, the first switch element is turned on after the first voltage conversion device operates.

[0028] According to an optional embodiment of the power supply management system of the present application, the first switch element is turned off after the first voltage conversion device stops operating.

[0029] According to a second aspect of the present application, there is provided a fuel cell system for a vehicle, the fuel cell system comprising a fuel cell and a power supply management system according to one of the above embodiments.

[0030] Further features of the present application will become apparent from the claims, the drawings and the following description. The features and feature combinations mentioned in the above description and in the claims, and the features and feature combinations mentioned in the following description of the drawings, can be used not only in the specified combinations, but also in other combinations or in isolation, without departing from the scope of the present application. Therefore, the following is also considered to be disclosed and covered by the present application: what is not explicitly disclosed in the drawings and not explicitly explained, but is derived from the combinations of features from the explained content and results from these combinations. The following is also considered to be disclosed: what does not have all the features of the originally written independent claim. Furthermore, the following is considered to be disclosed in particular by the above content: what goes beyond or deviates from the feature combinations defined in the reference relationship of the claims. BRIEF DESCRIPTION OF DRAWINGS

[0031] Further optional details and features of the present application result from the following description of preferred embodiments, which are shown schematically in the drawings.

[0032] Figure 1 a schematic configuration diagram of one embodiment of the power supply management system of the fuel cell system for a vehicle of the present application is shown;

[0033] Figure 2 a schematic configuration diagram of another embodiment of the power supply management system of the fuel cell system for a vehicle of the present application is shown;

[0034] Figure 3 a flowchart of the operation of the power supply management system in Figure 1 when powered on is shown;

[0035] Figure 4 a flowchart of the operation of the power supply management system in Figure 1 when powered off is shown;

[0036] Figure 5 An operation flowchart of the power supply management system in Figure 2 at the time of power-off is shown.

[0037] Figure 6 An operation flowchart of the power supply management system in Figure 2 at the time of power-off is shown.

[0038] List of reference numerals

[0039] 1 power supply management system

[0040] 11 first power supply unit

[0041] 12 vehicle control unit

[0042] 13 fuel cell control unit

[0043] 14 first switching element

[0044] 15 first voltage conversion device

[0045] 16 second switching element

[0046] 17 second power supply unit

[0047] 18 third power supply unit

[0048] 19 auxiliary equipment unit

[0049] 20 second voltage conversion device DETAILED DESCRIPTION

[0050] In order to make the technical problems to be solved by the present application, the technical solutions and the beneficial technical effects clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and multiple exemplary embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the protection scope of the present application.

[0051] The features in the embodiments of the present application can be combined with each other without conflict. In different drawings, the same components are denoted by the same reference numerals, and other components are omitted for brevity, but this does not mean that the technical solutions of the present application cannot include other components. It should be understood that the size, proportional relationship and number of components in the drawings are not as a limitation on the present application.

[0052] The present application relates to a power supply management system for a fuel cell system of a vehicle. By means of the power supply management system according to the present application, it is possible to reliably enable a fuel cell control unit to function normally and to avoid damage to the fuel cell control unit even in the case where the operating voltage of a vehicle control unit and the operating voltage of the fuel cell control unit are designed to be different. Furthermore, by means of the power supply management system according to the present application, it is also possible to avoid the problem that the fuel cell system loses low-voltage power supply due to an accidental or premature disconnection of a manual switch and thus cannot complete a shutdown process and to prevent a low-voltage power supply from being continuously consumed due to static power consumption.

[0053] In the following, embodiments of a power supply management system according to the present application will be described with reference to the accompanying drawings. Figure 1 and Figure 2 In the following, embodiments of a power supply management system according to the present application will be described with reference to the accompanying drawings.

[0054] Figure 1 A schematic configuration diagram of one embodiment of a power supply management system 1 for a fuel cell system of a vehicle according to the present application is shown. The power supply management system 1 is exemplarily used for a hydrogen fuel cell system.

[0055] As shown in Figure 1 , the power supply management system 1 comprises a first power supply unit 11. The first power supply unit 11 is configured as a low-voltage power supply unit, for example a low-voltage battery, and is capable of providing a first voltage. In this embodiment, the first power supply unit 11 exemplarily provides a first voltage of 12 V. It is of course also conceivable that the first power supply unit 11 provides a first voltage other than 12 V, for example a first voltage of 110 V. Furthermore, the power supply management system 1 comprises a vehicle control unit 12 and a fuel cell control unit 13. The vehicle control unit 12 is electrically connected to the first power supply unit 11 to form an electrical circuit and is capable of controlling the operation of the vehicle at the first voltage provided by the first power supply unit 11 and in this embodiment at a voltage of 12 V. The fuel cell control unit 13 is used to control the operation of the fuel cell system at a second voltage different from the first voltage. In this embodiment, the fuel cell control unit is exemplarily operated at a voltage of 24 V. Since the operating voltage of the fuel cell control unit 13 is different from that of the vehicle control unit 12, if the fuel cell control unit 13 and the vehicle control unit 12 are both supplied with power by the first power supply unit 11, it can result in the fuel cell control unit 13 not functioning normally and can also cause damage to the fuel cell control unit.

[0056] According to this embodiment, the power supply management system 1 further includes a first voltage conversion device 15. The first power supply unit 11 is electrically connected to the fuel cell control unit 13 via the first voltage conversion device 15 to form a power supply circuit. Exemplarily, the first voltage conversion device 15 is configured as a buck-boost DC-DC converter and can be controlled by the vehicle control unit 12 to convert a first voltage, for example, 12V, to a second voltage, for example, 24V. Thus, both the vehicle control unit 12 and the fuel cell control unit 13, which operate on different voltage platforms, can be powered by the first power supply unit 11, i.e., the low-voltage power supply unit. Therefore, the first voltage conversion device 15 ensures the power supply signal KL30 for powering the fuel cell control unit 13, thereby ensuring the reliable operation of the fuel cell control unit 13. Furthermore, when the fuel cell system is shut down, the first voltage conversion device 15 stops operating under the control of the vehicle control unit 12, so that during long-term standby, the electrical energy of the first power supply unit 11 will not be consumed by the fuel cell control unit 13, preventing insufficient power from starting the vehicle during the next operation.

[0057] To reliably control the fuel cell control unit 13, the power management system 1 further includes a first switching element 14. The first switching element 14 is exemplarily configured as a relay and is capable of selectively connecting or disconnecting the electrical connection between the fuel cell control unit 13 and the vehicle control unit 12 in a controlled manner. Therefore, control signals from the vehicle control unit 12, such as the control signal KL15 used to wake up the fuel cell control unit 13, can be transmitted to the fuel cell control unit 13 via the first switching element 14.

[0058] According to this embodiment, the power supply management system 1 further includes a third power supply unit 18, an auxiliary equipment unit 19, and a second voltage conversion device 20.

[0059] like Figure 1 As shown, the third power supply unit 18 is electrically connected to the auxiliary equipment unit 19 to form a power supply circuit. Here, the third power supply unit 18 is configured as a high-voltage power supply unit and exemplarily provides a third voltage of 300V. In this embodiment, the auxiliary equipment unit 19 may include all components and subsystems that support the operation of the fuel cell system, except for the fuel cell stack, and exemplarily includes an air supply system, a water management system, a hydrogen supply system, etc.

[0060] Furthermore, the third power supply unit 18 and the auxiliary device unit 19 are electrically connected with the first power supply unit 11 via a second voltage conversion device 20, respectively. Here, the second voltage conversion device 20 is exemplarily configured as a step-down DC-DC converter and serves for converting the third voltage into the first voltage. Thus, during operation of the fuel cell system, the third power supply unit 18 not only ensures the reliable operation of the auxiliary device unit 19 and, if necessary, the operation of the drive system of the vehicle, but also can charge the first power supply unit 11.

[0061] Figure 2 A schematic configuration diagram of another embodiment of the power supply management system 1 of the fuel cell system for a vehicle according to the present application is shown.

[0062] As Figure 2 shown, this embodiment differs from the embodiment of Figure 1 in that, in this embodiment of Figure 2 , the power supply management system 1 further comprises a second switching element 16 and a second power supply unit 17. The second power supply unit 17 is able to supply the fuel cell control unit 13 with a second voltage, for example 24 V, in addition to or instead of the first power supply unit 11.

[0063] The second switching element 16 is connected between the second power supply unit 17 and the fuel cell control unit 13 and is able to selectively switch on or off the electrical connection between the second power supply unit 17 and the fuel cell control unit 13. In this embodiment, the second switching element 16 is configured as a manual switch and can be manually operated by a user, for example.

[0064] Furthermore, the second power supply unit 17 is also electrically connected with the first power supply unit 11 via the first voltage conversion device 15 to form a power supply loop. During operation of the fuel cell system, the second power supply unit 17 can be charged by the first power supply unit 11 under the control of the vehicle control unit 12. Thus, the first voltage conversion device 15 converts the first voltage of the first power supply unit 11 into the second voltage, thereby reliably ensuring the charging of the second power supply unit 17.

[0065] In this embodiment, due to the additionally provided second power supply unit 17, not only the wake-up function and / or the power supply function of the fuel cell control unit 13 can be flexibly realized, but also in the case that the second power supply unit 17 supplies the fuel cell control unit 13 with power and the second switching element 16 is suddenly switched off, misoperated or prematurely powered down, the first voltage conversion device 15 is also able to convert the first voltage of the first power supply unit 11 into the second voltage under the control of the vehicle control unit 12 and to continue to supply the fuel cell control unit 13 with power, thereby ensuring the reliable operation of the fuel cell control unit 13 or the fuel cell system.

[0066] In Figure 2 , as in theFigure 1 The same parts as in the embodiments can be referred to Figure 1 The description in [the text] is already there and therefore will not be repeated here.

[0067] Figure 3 It shows Figure 1 The power supply management system 1 is shown in the operation flowchart when it is powered on. The operation flowchart schematically includes steps S101 to S108.

[0068] See also Figure 1 In step S101, the vehicle key is inserted, the vehicle is powered on, and the first power supply unit 11 supplies power to the vehicle control unit 12 with a first voltage. Next, in step S102, the vehicle control unit 12 sends a control signal to the first voltage converter 15, for example via a bus, to control the first voltage converter 15 to start operation. After the first voltage converter 15 starts operating, in step S103, the vehicle control unit 12 controls the first switching element 14 to turn on, so that the vehicle control unit 12 can send a control signal to the fuel cell control unit 13 to wake it up. In step S104, the fuel cell control unit 13 performs a self-test. If the self-test is successful, step S105 is performed, in which the vehicle control unit 12 controls the third power supply unit 18 to start. Optionally, the vehicle control unit 12 also sends a control signal to the second voltage converter 20 to start operation, so that the first power supply unit 11 can be additionally charged by the third power supply unit 18. Next, in step 106, the vehicle control unit 12 requests the fuel cell control unit 13 to start the fuel cell system, and in step 107, the fuel cell control unit 13 controls the fuel cell system to complete the start-up. If a self-test problem occurs in step S104, step S108 is performed, in which the fuel cell control unit 13 does not allow the fuel cell system to start.

[0069] Figure 4 It shows Figure 1 The power supply management system 1 in the diagram is shown in the operation flowchart during a power outage. The operation flowchart schematically includes steps S191 to S197.

[0070] In step S191, the vehicle key is turned off, and the vehicle power is cut off. In step S192, the vehicle control unit 12 sends a request to the fuel cell control unit 13 to normally shut down the fuel cell system. Upon receiving the shutdown request, in step S193, the fuel cell control unit 13 controls the fuel cell system to shut down and sends a shutdown completion flag to the vehicle control unit 12. After receiving the flag, the vehicle control unit 12 controls the third power supply unit 18 to shut down in step S194. Next, in step S195, the vehicle control unit 12 sends a control signal to the first switching element 14 to disconnect it, causing the fuel cell control unit 13 to enter a sleep state. Next, in step S196, the vehicle control unit 12 sends a control signal to the first voltage conversion device 15 to stop it from operating, thereby stopping the supply of the second voltage to the fuel cell control unit 13. Finally, in step S197, the vehicle shutdown is complete, and the vehicle enters a low-power mode.

[0071] Figure 5 It shows Figure 2 The power supply management system 1 operates as follows when powered on. This process includes steps S301 to S309.

[0072] See also Figure 2 In step S301, the vehicle key is inserted, the vehicle is powered on, and the first power supply unit 11 supplies power to the vehicle control unit 12 with a first voltage. Next, in step S302, it is checked whether the second switching element 16 is turned on. If so, meaning the second power supply unit 17 supplies power to the fuel cell control unit 13, then proceed to step S304. In step S304, the vehicle control unit 12 controls the first switching element 14 to turn on, thereby waking up the fuel cell control unit 13 and starting it to work. Thus, the vehicle control unit 12 can send corresponding control signals to the fuel cell control unit 13 to control the operation of the fuel cell system. If not, in step S303, the vehicle control unit 12 sends a control signal to the first voltage conversion device 15, for example via a bus, to control the first voltage conversion device 15 to start operating, thereby the first power supply unit 11 supplies power to the fuel cell control unit 13. Afterwards, steps S305 to S309 are... Figure 3 Steps S104 to S108 in the embodiments correspond to each other, so they will not be described again here.

[0073] Figure 6 It shows Figure 2 The power supply management system 1 in the diagram is shown in the operation flowchart during a power outage. The operation flowchart schematically includes steps S401 to S409.

[0074] In step S401, the vehicle key is turned off, and the vehicle is powered off. In step S402, the vehicle control unit 12 sends a request to the fuel cell control unit 13 to normally shut down the fuel cell system. Upon receiving the shutdown request, in step S403, the fuel cell control unit 13 controls the fuel cell system to shut down and sends a flag indicating completion of the shutdown to the vehicle control unit 12. Upon receiving the flag, the vehicle control unit 12 controls the third power supply unit 18 to shut down in step S404. Next, in step S405, the vehicle control unit 12 sends a control signal to the first switching element 14 to turn it off, so that the fuel cell control unit 13 enters a sleep state. Next, in step S406, the vehicle control unit 12 checks whether the second switching element 16 is turned on, and if so, in step S407, the vehicle control unit 12 outputs a prompt to manually turn off the second switching element 16. If not, in step S408, the vehicle control unit 12 sends a control signal to the first voltage conversion device 15 to stop operating, thereby stopping the supply of the second voltage to the fuel cell control unit 13. Finally, in step S409, the vehicle is turned off and enters a low-power mode.

[0075] The present application also protects a fuel cell system for a vehicle, the fuel cell system comprising a fuel cell and the power supply management system 1 of one of the above embodiments.

[0076] In this specification, unless otherwise expressly specified and limited, the terms "arranged", "connected", and "coupled" are to be construed broadly. For example, it can be fixedly connected, or detachably connected, or integrally connected; it can be mechanically connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate element, or communication inside two elements. The expressions "first", "second", etc. are only for descriptive purposes, and should not be understood as indicating or implying relative importance, nor should it be understood as implicitly indicating the number of the technical features indicated. The features with "first", "second" can explicitly or implicitly indicate that they include at least one of the features. For those skilled in the art, the meaning of the above terms in this application can be understood according to the circumstances.

Claims

1. A power supply management system for a fuel cell system of a vehicle, characterized by, The power supply management system (1) includes: a first power supply unit (11) configured to supply power at a first voltage; a vehicle control unit (12) electrically connected to the first power supply unit (11) and configured to control operation of the vehicle at the first voltage; a fuel cell control unit (13) configured to control operation of the fuel cell system at a second voltage different from the first voltage; a first switching element (14) selectively connecting or disconnecting electrical connection between the fuel cell control unit (13) and the vehicle control unit (12) and configured to transmit a control signal of the vehicle control unit (12) to the fuel cell control unit (13); and a first voltage conversion device (15) via which the first power supply unit (11) is electrically connected to the fuel cell control unit (13), and the first voltage conversion device (15) is configured to convert the first voltage to the second voltage under control of the vehicle control unit (12).

2. The power supply management system of claim 1, wherein, The power supply management system further includes a second switching element (16) and a second power supply unit (17) configured to supply power at the second voltage, and the second switching element (16) selectively connects or disconnects electrical connection between the second power supply unit (17) and the fuel cell control unit (13).

3. The power supply management system of claim 2, wherein, The first power supply unit (11) is electrically connected to the second power supply unit (17) through the first voltage conversion device (15) and charges the second power supply unit (17) under control of the vehicle control unit (12).

4. The power supply management system according to claim 2 or 3, characterized by, The second voltage is supplied to the fuel cell control unit (13) for wake-up function and / or power supply function of the fuel cell control unit (13) by the first power supply unit (11) via the first voltage conversion device (15) or by the second power supply unit (17).

5. The power supply management system according to claim 2 or 3, wherein the first voltage is greater than or less than the second voltage; and / or the first power supply unit (11) and the second power supply unit (17) are configured as low-voltage power supply units.

6. The power management system of claim 1, wherein, The power supply management system further comprises a third power supply unit (18), an auxiliary device unit (19), and a second voltage conversion device (20), the third power supply unit (18) is electrically connected with the auxiliary device unit (19), and the third power supply unit (18) and the auxiliary device unit (19) are electrically connected with the first power supply unit (11) via the second voltage conversion device (20), wherein the third power supply unit (18) is configured as a high-voltage power supply unit and supplies power at a third voltage, and the second voltage conversion device (20) is configured as a step-down DC-DC converter or a step-up / step-down DC-DC converter and is adapted to convert the third voltage to the first voltage.

7. The power management system of claim 4, wherein, In the case that the second power supply unit (17) supplies power to the fuel cell control unit (13) and the second switch element (16) is suddenly turned off, the first voltage conversion device (15) converts the first voltage of the first power supply unit (11) to the second voltage under the control of the vehicle control unit (12) and supplies power to the fuel cell control unit (13).

8. The power supply management system according to one of claims 2, 3 and 7, wherein the first switch element (14) is configured as a relay or a transistor; and / or the second switch element (16) is configured as a manual switch; and / or the first voltage conversion device (15) is configured as a step-up DC-DC converter or a step-up / step-down DC-DC converter.

9. The power supply management system according to claim 1, wherein after the vehicle key is inserted, the vehicle control unit (12) controls the first voltage conversion device (15) to operate; and / or after the first voltage conversion device (15) operates, the first switch element (14) is turned on; and / or after the first voltage conversion device (15) stops operating, the first switch element (14) is turned off.

10. A fuel cell system for a vehicle, characterized by The fuel cell system comprises a fuel cell and a power supply management system (1) according to one of claims 1 to 9.

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