CN117124852A - Power supply control method and active fuel cell system - Google Patents

Abstract

The application provides a power supply control method and an active fuel cell system, which relate to the technical field of fuel cells, wherein the active fuel cell system comprises a fuel cell control module, a candidate power supply module and a fuel cell, and the method comprises the following steps: the fuel cell control module detects a power supply signal of the whole vehicle to the active fuel cell system; if the fuel cell control module detects a low-voltage power supply abnormality signal of the whole vehicle, starting the candidate power supply module to provide working voltage for the active fuel cell system; the fuel cell control module sends a shutdown purging signal to the fuel cell so as to enable the fuel cell to realize shutdown purging; the fuel cell control module receives a purging end signal fed back by the fuel cell and closes the candidate power supply module. The active fuel cell system provided by the application solves the problem that the fuel cell system cannot purge when an external power supply is disconnected abnormally, reduces liquid water in the fuel cell and avoids the damage of the fuel cell.

Description

Power supply control method and active fuel cell system

Technical Field

The present application relates to the field of fuel cell technologies, and in particular, to a power supply control method and an active fuel cell system.

Background

Hydrogen energy is used as an energy carrier of a zero-carbon material, the rapid application and development are achieved in recent years, a fuel cell is a chemical device for directly converting chemical energy of fuel into electric energy, and compared with other cells, the fuel cell has the characteristics of high efficiency, no pollution, safety, reliability and the like, and along with the innovation of technology, the fuel cell is widely applied to the field of automobiles.

At present, when the fuel cell system is applied to the whole vehicle, external power supply is required to normally start, and when the external power supply is disconnected abnormally, the fuel cell system loses power and cannot execute a conventional shutdown strategy. Particularly in winter, when the external power supply is abnormally disconnected and cannot be recovered in a short time, a large amount of liquid water remains in the stack, and the fuel cell system is easily damaged.

Disclosure of Invention

Accordingly, an object of the present application is to provide at least a power supply control method and an active fuel cell system, by which the problem that the fuel cell system cannot perform purging when an external power source is abnormally disconnected is solved, liquid water in the fuel cell is reduced, and damage to the fuel cell is avoided.

The application mainly comprises the following aspects:

in a first aspect, an embodiment of the present application provides a power supply control method applied to an active fuel cell system, where the active fuel cell system includes a fuel cell control module, a candidate power supply module, and a fuel cell, and the method includes: the fuel cell control module detects a power supply signal of the whole vehicle to the active fuel cell system; if the fuel cell control module detects a low-voltage power supply abnormality signal of the whole vehicle, starting the candidate power supply module to provide working voltage for the active fuel cell system; the fuel cell control module sends a starting signal to the fuel cell to control the starting of the fuel cell; the fuel cell control module sends a shutdown purging signal to the fuel cell so as to enable the fuel cell to realize shutdown purging; the fuel cell control module receives a purging end signal fed back by the fuel cell and closes the candidate power supply module.

In one possible implementation manner, the candidate power supply module comprises a step-down DC/DC conversion unit, an energy storage unit and a low-voltage power distribution unit, wherein if the fuel cell control module detects a low-voltage power supply abnormality signal of the whole vehicle, the step-down DC/DC conversion unit is started; the voltage provided by the energy storage unit is sequentially supplied to the active fuel cell system through the step-down DC/DC conversion unit and the low-voltage distribution unit.

In one possible embodiment, the active fuel cell system further includes a bi-directional buck-boost DC/DC conversion unit and a primary DC/DC conversion unit, wherein after the candidate power module starts operating, the method further includes: the fuel cell control module starts a bidirectional buck-boost DC/DC conversion unit and a primary DC/DC conversion unit; the energy storage unit in the candidate power supply module provides starting high voltage for the fuel cell through the bidirectional buck-boost DC/DC conversion unit and the primary DC/DC conversion unit in sequence.

In one possible embodiment, the active fuel cell system further comprises a DC/AC conversion module, wherein after the fuel cell is normally started up at the starting high voltage provided by the candidate power supply module: the fuel cell control module starts the DC/AC conversion module; the voltage output by the fuel cell sequentially passes through the primary DC/DC conversion unit and the DC/AC conversion module to supply power for an auxiliary system corresponding to the fuel cell.

In one possible embodiment, the candidate power supply module is turned off by: the fuel cell control module receives a purging end signal fed back by the fuel cell, and closes the bidirectional buck-boost DC/DC conversion unit to close the energy storage unit to supply power to the high voltage of the auxiliary system; the fuel cell control module turns off the buck DC/DC conversion unit to shut down the entire active fuel cell system.

In one possible embodiment, the method further comprises: if the fuel cell control module detects that the whole vehicle is abnormal in high-voltage power supply, starting a bidirectional buck-boost DC/DC conversion unit and a primary DC/DC conversion unit through the whole vehicle low-voltage power supply; the voltage provided by the energy storage unit in the candidate power supply module sequentially passes through the bidirectional buck-boost DC/DC conversion unit and the primary DC/DC conversion unit to provide starting high voltage for the fuel cell, so that the fuel cell can be started normally; the fuel cell control module sends a shutdown purging signal to the fuel cell so as to enable the fuel cell to realize shutdown purging; the fuel cell control module receives a purging end signal fed back by the fuel cell and closes the candidate power supply module.

In one possible embodiment, the method further comprises: if the fuel cell control module detects a normal power supply signal of the whole vehicle, the primary DC/DC conversion unit is started, so that the fuel cell sequentially supplies power to an external load through the primary DC/DC conversion unit; the fuel cell control module detects the voltage of the energy storage unit in real time, and when the voltage of the energy storage unit is smaller than a preset voltage value, the bidirectional buck-boost DC/DC conversion unit is started; the voltage output by the primary DC/DC conversion unit charges the energy storage unit through the bidirectional buck-boost DC/DC conversion unit; and if the fuel cell control module detects that the voltage of the energy storage unit is greater than or equal to a preset voltage value, the bidirectional buck-boost DC/DC conversion unit is turned off.

In one possible embodiment, the primary DC/DC conversion unit is a unidirectional boost DC/DC conversion unit if the maximum output voltage of the fuel cell is less than the rated voltage of the power cell; if the maximum output voltage of the fuel cell is greater than the rated voltage of the power cell, the primary DC/DC conversion unit is a unidirectional buck-boost DC/DC conversion unit.

In one possible embodiment, the input voltage range of the buck DC/DC conversion unit covers the voltage range of the energy storage unit.

In a second aspect, the present application further provides an active fuel cell system, where the active fuel cell system includes a fuel cell control module, a candidate power supply module, and a fuel cell, and the fuel cell control module detects a power supply signal of the whole vehicle to the active fuel cell system; if the fuel cell control module detects a low-voltage power supply abnormality signal of the whole vehicle, starting the candidate power supply module to provide working voltage for the active fuel cell system; the fuel cell control module sends a starting signal to the fuel cell to control the starting of the fuel cell, and sends a shutdown purging signal to the fuel cell to enable the fuel cell to realize shutdown purging; the fuel cell control module receives a purging end signal fed back by the fuel cell and closes the candidate power supply module.

The embodiment of the application provides a power supply control method and an active fuel cell system, wherein the active fuel cell system comprises a fuel cell control module, a candidate power supply module and a fuel cell, and the method comprises the following steps: the fuel cell control module detects a power supply signal of the whole vehicle to the active fuel cell system; if the fuel cell control module detects a low-voltage power supply abnormality signal of the whole vehicle, starting the candidate power supply module to provide working voltage for the active fuel cell system; the fuel cell control module sends a starting signal to the fuel cell to control the starting of the fuel cell; the fuel cell control module sends a shutdown purging signal to the fuel cell so as to enable the fuel cell to realize shutdown purging; the fuel cell control module receives a purging end signal fed back by the fuel cell and closes the candidate power supply module. The active fuel cell system provided by the application solves the problem that the fuel cell system cannot purge when an external power supply is disconnected abnormally, reduces liquid water in the fuel cell and avoids the damage of the fuel cell. The active fuel cell system provided by the application solves the problem that the fuel cell system cannot purge when an external power supply is disconnected abnormally, reduces liquid water in the fuel cell and avoids the damage of the fuel cell.

In order to make the above objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 shows one of the schematic structural diagrams of an active fuel cell system according to an embodiment of the present application;

FIG. 2 is a flowchart of a power supply control method according to an embodiment of the present application;

FIG. 3 shows a second schematic diagram of an active fuel cell system according to an embodiment of the present application;

fig. 4 is a schematic diagram showing an operation process of an active fuel cell system according to an embodiment of the present application.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present application, and it should be understood that the drawings in the present application are for the purpose of illustration and description only and are not intended to limit the scope of the present application. In addition, it should be understood that the schematic drawings are not drawn to scale. A flowchart, as used in this disclosure, illustrates operations implemented according to some embodiments of the present application. It should be appreciated that the operations of the flow diagrams may be implemented out of order and that steps without logical context may be performed in reverse order or concurrently. Moreover, one or more other operations may be added to or removed from the flow diagrams by those skilled in the art under the direction of the present disclosure.

In addition, the described embodiments are only some, but not all, embodiments of the application. The components of the embodiments of the present application generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the application, as presented in the figures, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by a person skilled in the art based on embodiments of the application without making any inventive effort, fall within the scope of the application.

At present, when the fuel cell system is applied to a whole vehicle, external power supply is required to be normally started, after the external power supply is abnormally disconnected, the fuel cell system loses power, a conventional shutdown strategy cannot be executed, particularly in winter, when the external power supply (high voltage or low voltage) is abnormally disconnected and cannot be recovered in a short time, a large amount of liquid water can remain in a pile, the fuel cell system is easy to damage, in the prior art, the fuel cell system is normally powered by the direct connection of an independent uninterruptible power supply and the fuel cell system, but the voltage requirement of the whole vehicle is in the range of 400V-750V, the voltage requirement of the uninterruptible power supply is high, the voltage volume of the uninterruptible power supply is also large, the whole vehicle space is occupied, and the arrangement is not facilitated.

Based on this, the embodiment of the application provides a power supply control method and an active fuel cell system, which solves the problem that the fuel cell system cannot purge when an external power supply is abnormally disconnected, reduces liquid water in the fuel cell, and avoids the damage of the fuel cell, and specifically comprises the following steps:

referring to fig. 1, fig. 1 shows a schematic structural diagram of an active fuel cell system according to an embodiment of the application. Referring to fig. 2, fig. 2 is a flowchart illustrating a power supply control method according to an embodiment of the application. As shown in fig. 1, an active fuel cell system provided by an embodiment of the present application includes a fuel cell control module 1, a candidate power supply module 2, and a fuel cell 3, wherein the fuel cell control module 1 is connected to the candidate power supply module 2 and the fuel cell 3, respectively.

As shown in fig. 2, the power supply control method provided by the embodiment of the application includes the following steps:

s100, a fuel cell control module detects a power supply signal of the whole vehicle to an active fuel cell system.

And S101, if the fuel cell control module detects a low-voltage power supply abnormality signal of the whole vehicle, starting the candidate power supply module to provide working voltage for the active fuel cell system.

S102, the fuel cell control module sends a starting signal to the fuel cell to control the starting of the fuel cell.

S103, the fuel cell control module sends a shutdown purging signal to the fuel cell so as to enable the fuel cell to realize shutdown purging.

S104, the fuel cell control module receives a purging end signal fed back by the fuel cell, and closes the candidate power supply module.

In step S100, under normal conditions, the starting high voltage power and the low voltage power of the active fuel cell system are provided by the whole vehicle, the high voltage power provided by the whole vehicle is used for realizing the normal operation of the fuel cell, the low voltage power provided by the whole vehicle realizes the transmission of the internal control signal of the active fuel cell system, the fuel cell control module 1 monitors the power supply signal of the whole vehicle to the active fuel cell system in real time, if the abnormal signal of the low voltage power supply of the whole vehicle is detected, it indicates that the whole vehicle is not under the condition of normal power down (whether the whole vehicle is under the condition of normal power down or not can be determined by detecting the normal power down zone bit), the low voltage power supply to the active fuel cell system is abnormal (the abnormal high voltage power supply to the active fuel cell system is also caused by default at the moment), at this moment, the abnormal disconnection of the external power supply, the fuel cell stops working, and liquid water is caused in the fuel cell.

In the application, in step S101 to step S104, in order to process the liquid water in the fuel cell under the above conditions, when the low-voltage power supply of the active fuel cell system is abnormal, the candidate power supply module 2 needs to be started at this time to provide the working voltage for the whole active fuel cell system to enable the whole active fuel cell system to work normally, at this time, the candidate power supply module 2 provides the low-voltage power supply for the active fuel cell system to maintain the normal operation of the active fuel cell system, after the active fuel cell system is in normal operation, the fuel cell control module 1 sends a start signal to the fuel cell to control the start-up of the fuel cell 3, so that the fuel cell control module 1 can send a shutdown purge signal to the fuel cell 3, at this time, the fuel cell 3 does not output voltage outwards, only realizes self purging, thereby processing a large amount of liquid water remained by the fuel cell 3 completely, preventing damage of the fuel cell 3, and after the purging is finished, the candidate power supply module 2 is closed to shut down the whole active fuel cell system.

Referring to fig. 3, fig. 3 shows a second schematic structure of an active fuel cell system according to an embodiment of the application. As shown in fig. 3, the candidate power supply module 2 includes a step-down DC/DC conversion unit 21, an energy storage unit 22, and a low-voltage power distribution unit 23, where the step-down DC/DC conversion unit 21 is connected to the fuel cell control module 1, the energy storage unit 22, and the low-voltage power distribution unit 23 is further connected to low-voltage devices (not shown in the figure) including the fuel cell control module 1 inside the active fuel cell system, and the energy storage unit 22 may be a lithium battery, or may be a supercapacitor.

In a preferred embodiment, if the fuel cell control module 1 detects an abnormal signal of low-voltage power supply of the whole vehicle, the step-down DC/DC conversion unit 21 is started, and the voltage provided by the energy storage unit 22 sequentially passes through the step-down DC/DC conversion unit 21 and the low-voltage distribution unit 23 to provide a low-voltage working voltage for the active fuel cell system.

In a specific implementation, when the fuel cell control module 1 detects an abnormal signal of low-voltage power supply of the whole vehicle, the candidate power supply module 2 inside the active fuel cell system needs to be started to provide low-voltage power for the whole vehicle to maintain normal operation, specifically, the fuel cell control module 1 controls the step-down DC/DC conversion unit 21 to start operation, after the step-down DC/DC conversion unit 21 is started, the energy storage unit 22 steps down the voltage stored by the energy storage unit itself through the step-down DC/DC conversion unit 21, and then provides an operating voltage for the active fuel cell system through the low-voltage power distribution unit 23, wherein the operating voltage is low-voltage power, so that under the condition that the whole vehicle is in power failure, the fuel cell control module 1 can also send a starting signal and a shutdown purging signal to the fuel cell 3 to realize purging control of the fuel cell 3.

As shown in fig. 3, the active fuel cell system further includes a bi-directional buck-boost DC/DC conversion unit 4, a primary DC/DC conversion unit 5, and specifically, the bi-directional buck-boost DC/DC conversion unit 4 is connected to the primary DC/DC conversion unit 5 and the energy storage unit 22, respectively, and the primary DC/DC conversion unit 5 is further connected to the fuel cell 3.

In a preferred embodiment, after the candidate power module starts operating, the method further comprises:

the fuel cell control module 1 starts the bidirectional buck-boost DC/DC conversion unit 4 and the primary DC/DC conversion unit 5, and the energy storage unit 22 in the candidate power supply module 2 sequentially provides a starting high voltage for the fuel cell 3 through the bidirectional buck-boost DC/DC conversion unit 4 and the primary DC/DC conversion unit 5.

Specifically, when the fuel cell control module 1 detects an abnormal signal of low-voltage power supply of the whole vehicle, the fuel cell 3 loses a high-voltage starting signal, so that the fuel cell 3 is in a high-voltage power-down closing state, purging of the fuel cell cannot be achieved at this time, after the energy storage unit 22 supplies power to an active fuel cell system, the high-voltage power supply to the fuel cell 3 is started, the fuel cell 3 can be started, purging of the fuel cell 3 to liquid water of the fuel cell itself is achieved, specifically, the bidirectional buck-boost DC/DC conversion unit 4 and the primary DC/DC conversion unit 5 are required to be started, the voltage provided by the energy storage unit 22 is input to the primary DC/DC conversion unit 5 after being boosted by the bidirectional buck-boost DC/DC conversion unit 4, and the primary DC/DC conversion unit 5 is supplied to the fuel cell 3 after being boosted again, so that the fuel cell is started to purge itself.

In the present application, the active fuel cell system further comprises an auxiliary system 6, the auxiliary system 6 being connected to the fuel cell 3 for delivering fuel to the fuel cell 3, the auxiliary system 6 comprising at least one ac device, the auxiliary system 6 being a BOP (Balance of Plant) system.

In another preferred embodiment, the active fuel cell system further includes a DC/AC conversion module 7, where the DC/AC conversion module 7 includes at least one DC/AC conversion unit, and the number of the at least one DC/AC conversion unit may be set by the number of AC devices inside the auxiliary system 6, and the AC devices inside the auxiliary system 6 are different, and specifications of the at least one DC/AC conversion unit correspondingly connected to the AC devices are also different, and the AC devices may be three-phase AC devices, and may be an air compressor driving unit, a hydrogen pump driving unit, or a water pump driving unit.

After the fuel cell is normally started under the starting high voltage provided by the candidate power supply module: the fuel cell control module starts the DC/AC conversion module, and the voltage output by the fuel cell 3 sequentially passes through the primary DC/DC conversion unit 5 and the DC/AC conversion module 7 to supply power to the fuel cell 3, specifically, to supply AC power to at least one AC device inside the auxiliary system 6.

Preferably, the candidate power supply module is turned off by:

the fuel cell control module 1 receives a purge end signal fed back by the fuel cell 3, turns off the bidirectional buck-boost DC/DC conversion unit 4 and the primary DC/DC conversion unit to turn off the high-voltage power supply of the energy storage unit 22 to the fuel cell 3, and the fuel cell control module 1 turns off the buck-boost DC/DC conversion unit 21 to turn off the whole active fuel cell system.

In the present application, when the candidate power supply module is turned off, it is necessary to turn off the bidirectional buck-boost DC/DC conversion unit 4 first, and then turn off the buck-boost DC/DC conversion unit 21, thereby realizing the entire active fuel cell system.

In another preferred embodiment, if the fuel cell control module 1 detects that the whole vehicle is abnormal in high-voltage power supply, the whole vehicle is powered by low-voltage power supply to start the bidirectional buck-boost DC/DC conversion unit 4 and the primary DC/DC conversion unit 5, the voltage provided by the energy storage unit 22 in the candidate power supply module 2 sequentially passes through the bidirectional buck-boost DC/DC conversion unit 5 and the primary DC/DC conversion unit 4 to provide starting high voltage for the fuel cell 3, so that the fuel cell is started normally, the fuel cell control module 1 sends a shutdown purge signal to the fuel cell 3 to enable the fuel cell 3 to realize shutdown purge, and the fuel cell control module receives a purge end signal fed back by the fuel cell to close the candidate power supply module.

Specifically, when the abnormality of the high-voltage power supply of the whole vehicle is detected, the low-voltage power supply of the active battery power supply system is provided by the whole vehicle, however, the abnormality occurs in the high-voltage power supply of the whole vehicle to the active battery power supply system, that is, the fuel cell 3 loses the starting high voltage, at this time, the starting candidate power supply module 2 is not required to provide the low-voltage power supply, but the starting high voltage is required to be provided for the fuel cell 3 by means of the energy storage unit 22, so as to realize the purging of the fuel cell, specifically, the bidirectional buck-boost DC/DC conversion unit 4 is started to be in a boost mode, and the primary DC/DC conversion unit 5 is started, at this time, the energy storage unit 22 returns to the boost effect through the bidirectional buck-boost DC/DC conversion unit 4 and the primary DC/DC conversion unit 5, and the direct output direct current through the primary DC/DC conversion unit 5 is provided for the fuel cell 3 to realize the purging of the fuel cell, and after the fuel cell control module 1 receives the purging end signal fed back by the fuel cell 3, the bidirectional buck-boost DC/DC conversion unit 4 and the primary DC/DC conversion unit 5 are turned off in sequence, so that the whole active fuel cell system can be turned off.

In a preferred embodiment, the method further comprises:

if the fuel cell control module 1 detects a normal power supply signal of the whole vehicle, the primary DC/DC conversion unit 5 is started, so that the fuel cell 3 supplies power to an external load through the primary DC/DC conversion unit 5 in sequence, the fuel cell control module 1 detects the voltage of the energy storage unit 22 in real time, when the voltage of the energy storage unit 22 is smaller than a preset voltage value, the bidirectional buck-boost DC/DC conversion unit 4 is started, and the voltage output by the primary DC/DC conversion unit 5 charges the energy storage unit 22 through the bidirectional buck-boost DC/DC conversion 4.

In the present application, as shown in fig. 3, the primary DC/DC conversion unit 5 is also connected to a direct current distribution unit 81, the direct current distribution unit 81 is connected to a power battery 82 and a load 83, and the power battery 82 is connected to the load 83.

If the fuel cell control module 1 detects a normal power supply signal of the whole vehicle, it indicates that the high voltage and the low voltage of the active fuel cell system are provided by the whole vehicle, at this time, the primary DC/DC conversion unit 5 needs to be started, so that the fuel cell control module 1 is in a normal working state, in the normal working state, the power generated by the fuel cell 3 is boosted by the primary DC/DC conversion unit 5, a part of the power is provided with high voltage by the DC/AC conversion module 7 and the auxiliary system 6 directly, a part of the power is used for supplying power to a load after passing through the DC distribution unit 81, the fuel cell control module 1 detects the power cell voltage and the energy storage unit voltage in real time, when the power cell voltage is smaller than the preset power cell voltage value, the voltage output by the primary DC/DC conversion unit 5 is stored in the power cell 82 through the DC distribution unit 81, and when the power cell voltage is smaller than the preset voltage value, the voltage output by the primary DC/DC conversion unit 5 is also stored in the energy storage unit 22 after being converted by the bidirectional boost/buck DC/DC conversion unit 4, so as to ensure the constant electric quantity of the energy storage unit.

In a specific implementation, the primary DC/DC conversion unit 5 is a unidirectional step-up DC/DC conversion unit if the maximum output voltage of the fuel cell 3 is smaller than the rated voltage of the power cell 82, and the primary DC/DC conversion unit 5 is a unidirectional step-up and step-down DC/DC conversion unit if the maximum output voltage of the fuel cell 3 is larger than the rated voltage of the power cell 82.

In one possible embodiment, the operating voltage of the energy storage unit 22 is smaller than the operating voltage of the power battery 82, and the input voltage range of the step-down DC/DC conversion unit 21 covers the output voltage range of the primary DC/DC conversion unit 5 and the voltage range of the energy storage unit 22.

In the present application, as shown in fig. 3, the fuel cell control module 1 includes a fuel cell control unit 11 and an all-in-one control unit 12 that are connected to each other, the fuel cell control unit 11 performs start-stop control on the fuel cell 3, the auxiliary system 6, and the all-in-one control unit 12 performs start-stop control on the primary DC/DC conversion unit 5, the step-down DC/DC conversion unit 21, the DC/AC conversion module 7, and the bidirectional step-up/down DC/DC conversion unit 4.

In another embodiment of the present application, the multiple-in-one control unit 12, the primary DC/DC conversion unit 5, the step-down DC/DC conversion unit 21, the DC/AC conversion module 7, the bidirectional step-up/down DC/DC conversion unit 4, the energy storage unit 22 and the low-voltage distribution unit 23 may be integrated together to form a multiple-in-one controller, so that the size is reduced, and the whole vehicle arrangement is facilitated.

Referring to fig. 4, fig. 4 is a schematic diagram illustrating an active fuel cell system according to an embodiment of the application. As shown in fig. 4, the active fuel cell system provided by the application has the following working processes:

s200, the active fuel cell system and the whole vehicle work normally.

S201, low-voltage power supply of the active fuel cell system is provided by the whole vehicle, and starting high voltage is provided by the power battery.

S202, if the fuel cell control module detects that the whole vehicle is abnormal in high-voltage power supply, the bidirectional lifting DC/DC conversion unit works.

S203, the energy storage unit provides starting high voltage for the fuel cell through the bidirectional lifting DC/DC conversion unit.

S204, starting the fuel cell and implementing purging operation.

S205, if the fuel cell control module detects that the low-voltage power supply of the whole vehicle is abnormal, the step-down DC/DC conversion unit starts to work.

S206, the energy storage unit provides low voltage power for the active fuel cell system through the step-down DC/DC conversion unit and the low voltage distribution unit.

S207, the bidirectional lifting DC/DC conversion unit works.

S208, the energy storage unit provides starting high voltage for the fuel cell through the bidirectional lifting DC/DC conversion unit, and step S204 is executed.

It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described system and apparatus may refer to corresponding procedures in the foregoing method embodiments, which are not described herein again. In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. The above-described apparatus embodiments are merely illustrative, for example, the division of the units is merely a logical function division, and there may be other manners of division in actual implementation, and for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some communication interface, device or unit indirect coupling or communication connection, which may be in electrical, mechanical or other form.

The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit.

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a non-volatile computer readable storage medium executable by a processor. Based on this understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.

The foregoing is merely illustrative of the present application, and the present application is not limited thereto, and any person skilled in the art will readily appreciate variations or alternatives within the scope of the present application. Therefore, the protection scope of the application is subject to the protection scope of the claims.

Claims (10)

1. A power supply control method is characterized in that the method is applied to an active fuel cell system, the active fuel cell system comprises a fuel cell control module, a candidate power supply module and a fuel cell,

wherein the method comprises the following steps:

the fuel cell control module detects a power supply signal of the whole vehicle to the active fuel cell system;

if the fuel cell control module detects a low-voltage power supply abnormality signal of the whole vehicle, starting a candidate power supply module to provide working voltage for an active fuel cell system;

the fuel cell control module sends a starting signal to the fuel cell to control the start-up of the fuel cell;

the fuel cell control module sends a shutdown purging signal to the fuel cell so as to enable the fuel cell to realize shutdown purging;

and the fuel cell control module receives a purging end signal fed back by the fuel cell and closes the candidate power supply module.

2. The method of claim 1, wherein the candidate power supply module comprises a step-down DC/DC conversion unit, an energy storage unit, and a low voltage power distribution unit,

the fuel cell control module starts the step-down DC/DC conversion unit if detecting a low-voltage power supply abnormality signal of the whole vehicle;

the voltage provided by the energy storage unit sequentially passes through the step-down DC/DC conversion unit and the low-voltage distribution unit to provide working voltage for the active fuel cell system.

3. The method of claim 1, wherein the active fuel cell system further comprises a bi-directional buck-boost DC/DC conversion unit and a primary DC/DC conversion unit,

wherein, after the candidate power supply module starts working, the method further comprises:

the fuel cell control module starts the bidirectional buck-boost DC/DC conversion unit and the primary DC/DC conversion unit;

and an energy storage unit in the candidate power supply module sequentially provides starting high voltage for the fuel cell through the bidirectional buck-boost DC/DC conversion unit and the primary DC/DC conversion unit.

4. The method of claim 3, wherein the active fuel cell system further comprises a DC/AC conversion module,

after the fuel cell is normally started under the starting high voltage provided by the candidate power supply module:

the fuel cell control module starts the DC/AC conversion module;

and the voltage output by the fuel cell sequentially passes through the primary DC/DC conversion unit and the DC/AC conversion module to supply power for an auxiliary system corresponding to the fuel cell.

5. A method according to claim 3, characterized in that the candidate power supply module is turned off by:

the fuel cell control module receives a purging end signal fed back by the fuel cell, and closes the bidirectional buck-boost DC/DC conversion unit and the primary DC/DC conversion unit to close the high-voltage power supply of the energy storage unit to the fuel cell;

the fuel cell control module turns off the buck DC/DC conversion unit to shut down the entire active fuel cell system.

6. A method according to claim 3, characterized in that the method further comprises:

if the fuel cell control module detects that the whole vehicle is abnormal in high-voltage power supply, the two-way buck-boost DC/DC conversion unit and the primary DC/DC conversion unit are started through the whole vehicle low-voltage power supply;

the voltage provided by the energy storage unit in the candidate power supply module sequentially passes through the bidirectional buck-boost DC/DC conversion unit and the primary DC/DC conversion unit to provide starting high voltage for the fuel cell, so that the fuel cell can start up normally;

the fuel cell control module sends a shutdown purging signal to the fuel cell so as to enable the fuel cell to realize shutdown purging;

and the fuel cell control module receives a purging end signal fed back by the fuel cell and closes the candidate power supply module.

7. The method of claim 6, wherein the method further comprises:

if the fuel cell control module detects a normal power supply signal of the whole vehicle, the fuel cell control module starts the primary DC/DC conversion unit so that the fuel cell sequentially supplies power to an external load through the primary DC/DC conversion unit;

the fuel cell control module detects the voltage of the energy storage unit in real time, and when the voltage of the energy storage unit is smaller than a preset voltage value, the bidirectional buck-boost DC/DC conversion unit is started;

the voltage output by the primary DC/DC conversion unit charges an energy storage unit through the bidirectional buck-boost DC/DC conversion unit;

and if the fuel cell control module detects that the voltage of the energy storage unit is greater than or equal to a preset voltage value, the bidirectional buck-boost DC/DC conversion unit is turned off.

8. The method of claim 7, wherein the primary DC/DC conversion unit is a unidirectional boost DC/DC conversion unit if the maximum output voltage of the fuel cell is less than the rated voltage of the power cell;

if the maximum output voltage of the fuel cell is greater than the rated voltage of the power cell, the primary DC/DC conversion unit is a unidirectional buck-boost DC/DC conversion unit.

9. The method of claim 6, wherein the input voltage range of the buck DC/DC converter unit covers the voltage range of the energy storage unit.

10. An active fuel cell system, characterized in that the active fuel cell system comprises a fuel cell control module, a candidate power supply module and a fuel cell,

the fuel cell control module detects a power supply signal of the whole vehicle to the active fuel cell system;

if the fuel cell control module detects a low-voltage power supply abnormality signal of the whole vehicle, starting a candidate power supply module to provide working voltage for an active fuel cell system;

the fuel cell control module sends a starting signal to the fuel cell to control the start-up of the fuel cell;

the fuel cell control module sends a shutdown purging signal to the fuel cell so as to enable the fuel cell to realize shutdown purging;

and the fuel cell control module receives a purging end signal fed back by the fuel cell and closes the candidate power supply module.