A Method and Device for Battery Power Distribution during Idle of a Fuel Cell Vehicle

Abstract

An embodiment of the present invention provides a method and a device for allocating battery power during the idle speed of a fuel cell vehicle, relating to the technical field of new energy vehicles. The method includes: for a fuel cell vehicle, obtaining the state of charge of a power battery monitored by a vehicle control unit disposed in the fuel cell vehicle; when the fuel cell vehicle is in an idle speed working condition, formulating a relevant power allocation control strategy for the fuel cell and the power battery. In the formulated relevant power allocation control strategy for the fuel cell and the power battery, it is possible to determine according to the state of charge of the power battery: whether to use the power battery to allocate the fuel cell for power output, and the method for using the power battery to allocate the fuel cell for power output; managing the energy output of the fuel cell according to the power allocation control strategy, reducing the load of the fuel cell, preventing the fuel cell membrane from drying due to insufficient generation amount of reaction water, and improving the performance of the fuel cell.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy vehicles, and particularly relates to a battery power distribution method and device for a fuel cell vehicle during idling. Background Art

[0002] Fuel cell vehicles use fuel to achieve vehicle operation. The fuel cell generates electric energy through the reaction of hydrogen and oxygen, while the power battery drives the system relying on the electric energy stored in it. In the process of implementing the present invention, the applicant found that there are at least the following problems in the prior art:

[0003] In the prior art, during the idling condition of a fuel cell vehicle, the gas supply of the fuel cell is large, while the amount of water generated by the electrochemical reaction is small, resulting in easy drying of the fuel cell membrane, which in turn affects the conduction efficiency of the proton exchange membrane, reduces the performance of the fuel cell, and consumes the life of the fuel cell. At the same time, when the vehicle is idling, the fuel cell needs to maintain a basic power output to maintain system operation, but the fuel cell stack has low efficiency under low load, which easily causes problems such as hydrogen waste and performance degradation. Summary of the Invention

[0004] Embodiments of the present invention provide a battery power distribution method and device for a fuel cell vehicle during idling, which can solve the technical problems in the prior art of "causing the fuel cell membrane to be easily dried, thereby affecting the conduction efficiency of the proton exchange membrane and reducing the performance of the fuel cell; the fuel cell needs to maintain a basic power output to maintain system operation, but the fuel cell stack has low efficiency under low load, which easily causes hydrogen waste and performance degradation".

[0005] To achieve the above object, on the one hand, embodiments of the present invention provide a battery power distribution method for a fuel cell vehicle during idling, including:

[0006] For a fuel cell vehicle, obtain the state of charge SOC of the power battery monitored by a vehicle control unit provided in the fuel cell vehicle;

[0007] When the fuel cell vehicle is in an idling condition, formulate a relevant power distribution control strategy for the fuel cell and the power battery according to the state of charge SOC of the power battery. In the relevant power distribution control strategy, it is possible to determine according to the state of charge SOC of the power battery: whether to use the power battery to distribute the electric energy output of the fuel cell, and the method of using the power battery to distribute the electric energy output of the fuel cell;

[0008] Send the relevant power distribution control strategy to the vehicle control unit, where the relevant power distribution control strategy is used for the vehicle control unit to use the fuel cell or the power battery or the combination of the fuel cell and the power battery to provide power for the fuel cell vehicle based on the distribution control strategy, and dynamically meet the idle demand of the fuel cell vehicle.

[0009] On the other hand, an embodiment of the present invention provides a battery power distribution device for a fuel cell vehicle during idling, which is characterized by including:

[0010] An information acquisition module, configured to acquire the state of charge SOC of the power battery monitored by the vehicle control unit provided in the fuel cell vehicle for the fuel cell vehicle;

[0011] A power distribution control strategy formulation module, configured to formulate the relevant power distribution control strategy between the fuel cell and the power battery according to the state of charge SOC of the power battery when the fuel cell vehicle is in an idle condition. In the relevant power distribution control strategy, it is possible to determine according to the state of charge OC of the power battery: whether to use the power battery to distribute the power output of the fuel cell, and the method of using the power battery to distribute the power output of the fuel cell;

[0012] A power distribution control strategy sending module, configured to send the relevant power distribution control strategy to the vehicle control unit, where the relevant power distribution control strategy is used for the vehicle control unit to use the fuel cell or the power battery or the combination of the fuel cell and the power battery to provide power for the fuel cell vehicle based on the distribution control strategy, and dynamically meet the idle demand of the fuel cell vehicle.

[0013] The above technical solution has the following beneficial effects: When the fuel cell vehicle is idling, a reasonable power distribution control strategy is formulated for the fuel cell and the power battery according to the state of charge of the power battery, and the energy output of the fuel cell is managed according to the power distribution control strategy, reducing the load of the fuel cell, preventing the fuel cell membrane from drying due to insufficient generation of reaction water, and improving the performance of the fuel cell. Description of the Drawings

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0015] Figure 1It is a flowchart of a battery power distribution method for a fuel cell vehicle at idle speed according to an embodiment of the present invention;

[0016] Figure 2 It is a structural diagram of a battery power distribution device for a fuel cell vehicle at idle speed according to an embodiment of the present invention;

[0017] Figure 3 It is a complete flowchart of the fuel cell in idle power distribution control according to an embodiment of the present invention;

[0018] Figure 4 It is the power distribution control process of the fuel cell and the power battery under the idle condition according to an embodiment of the present invention;

[0019] Figure 5 It is the power control process of the power battery under the idle condition according to an embodiment of the present invention. Specific embodiments

[0020] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0021] As Figure 1 shown, in combination with the embodiments of the present invention, a battery power distribution method for a fuel cell vehicle at idle speed is provided, including:

[0022] S101: For a fuel cell vehicle, obtain the state of charge SOC of the power battery monitored by a vehicle control unit provided in the fuel cell vehicle;

[0023] S102: When the fuel cell vehicle is in an idle condition, formulate relevant power distribution control strategies for the fuel cell and the power battery according to the state of charge SOC of the power battery. In the formulated relevant power distribution control strategies for the fuel cell and the power battery, it is possible to determine according to the state of charge SOC of the power battery: whether to use the power battery to distribute the electric energy output of the fuel cell, and the method of using the power battery to distribute the electric energy output of the fuel cell;

[0024] S103: Send the relevant power distribution control strategies to the vehicle control unit. The relevant power distribution control strategies are used for the vehicle control unit to use the fuel cell or the power battery or the combination of the fuel cell and the power battery to provide power for the fuel cell vehicle based on the distribution control strategies, dynamically meeting the idle demand of the fuel cell vehicle.

[0025] Preferably, the state of charge (SOC) of the power battery represents the percentage of the current remaining power of the power battery relative to the total capacity of the power battery. When the lower critical value ≤ SOC ≤ the upper critical value, the power battery is in a safe and normal power supply state.

[0026] Preferably, S102: When the fuel cell vehicle is in an idle condition, formulate the relevant power distribution control strategy for the fuel cell and the power battery according to the state of charge (SOC) of the power battery, including:

[0027] When the fuel cell vehicle is in an idle condition, if the SOC is lower than the first preset value, the first preset value is higher than the lower critical value and lower than the upper critical value, formulate the first power distribution control strategy for the fuel cell and the power battery, and the first power distribution control strategy includes:

[0028] Set the power battery to a non-operating state, and output electric energy through the fuel cell at the first output power P0. The electric energy output at the first output power P0 is used to charge the power battery and to meet the power demand of the fuel cell vehicle under the idle condition;

[0029] When the SOC rises from the first preset value to the upper critical value, stop charging the power battery;

[0030] Start the power battery, and output electric energy through the power battery to meet the power demand of the fuel cell vehicle under the idle condition;

[0031] Turn off the fuel cell.

[0032] Preferably, the first power distribution control strategy further includes:

[0033] After outputting electric energy through the power battery to meet the power demand of the fuel cell vehicle under the idle condition, if the SOC drops from the upper critical value to the lower critical value during the idle condition, start the fuel cell and turn off the power battery;

[0034] Output electric energy through the fuel cell at the second output power P1. The electric energy output at the second output power P1 is used to charge the power battery and to meet the power demand of the fuel cell vehicle under the idle condition, and the second output power P1 is greater than the first output power P0;

[0035] When the SOC rises from the lower critical value to the upper critical value, stop charging the power battery;

[0036] Start the power battery, and output electric energy through the power battery to meet the power demand of the fuel cell vehicle under the idle condition;

[0037] Turn off the fuel cell.

[0038] Preferably, the first power distribution control strategy further includes:

[0039] During the process that the SOC rises from the lower critical value to the upper critical value, when the SOC rises from the lower critical value to the first preset value, reduce the second output power P1 of the fuel cell to the first output power P0.

[0040] Preferably, S102: When the fuel cell vehicle is in the idle condition, formulating the relevant power distribution control strategy for the fuel cell and the power battery according to the state of charge SOC of the power battery includes:

[0041] When the fuel cell vehicle is in the idle condition, if the SOC is at the lower critical value, formulate the second power distribution control strategy for the fuel cell and the power battery, and the second power distribution control strategy includes:

[0042] Set the power battery to a non-working state, output electric energy through the fuel cell at the second output power P1, and the electric energy output at the second output power P1 is used to charge the power battery and to meet the power demand of the fuel cell vehicle under the idle condition;

[0043] When the SOC rises from the lower critical value to the upper critical value, stop charging the power battery;

[0044] Start the power battery, and output electric energy through the power battery to meet the power demand of the fuel cell vehicle under the idle condition;

[0045] Turn off the fuel cell.

[0046] Preferably, the second power distribution control strategy further includes:

[0047] During the process that the SOC rises from the lower critical value to the upper critical value, when the SOC rises from the lower critical value to the first preset value, reduce the second output power P1 of the fuel cell to the first output power P0, and the first preset value is higher than the lower critical value and lower than the upper critical value.

[0048] As Figure 2 shown, in combination with the embodiments of the present invention, provide a battery power distribution device for a fuel cell vehicle during idling, including:

[0049] An information acquisition module 21, configured to obtain the state of charge (SOC) of a power battery monitored by a vehicle control unit disposed in a fuel cell vehicle for the fuel cell vehicle;

[0050] A power distribution control strategy formulation module 22, configured to formulate a relevant power distribution control strategy for a fuel cell and a power battery according to the state of charge (SOC) of the power battery when the fuel cell vehicle is in an idle condition. In the formulated relevant power distribution control strategy for the fuel cell and the power battery, it is possible to determine according to the state of charge of the power battery: whether to use the power battery to distribute the fuel cell for power output, and the method of using the power battery to distribute the fuel cell for power output;

[0051] A power distribution control strategy sending module 23, configured to send the relevant power distribution control strategy to the vehicle control unit. The relevant power distribution control strategy is used for the vehicle control unit to use the fuel cell or the power battery or a combination of the fuel cell and the power battery to provide power for the fuel cell vehicle based on the distribution control strategy, dynamically meeting the idle demand of the fuel cell vehicle.

[0052] Preferably, the state of charge (SOC) of the power battery represents the percentage of the current remaining power of the power battery relative to the total capacity of the power battery. When the lower critical value ≤ SOC ≤ the upper critical value, the power battery is in a safe and normal power supply state.

[0053] Preferably, the power distribution control strategy formulation module 22 includes a first formulation sub-module 221. The first formulation sub-module 221 is configured to:

[0054] When the fuel cell vehicle is in an idle condition, if the SOC is lower than a first preset value, the first preset value is higher than the lower critical value and lower than the upper critical value, formulate a first power distribution control strategy for the fuel cell and the power battery. The first power distribution control strategy includes:

[0055] Set the power battery to a non-operating state, and output electric energy through the fuel cell at a first output power P0. The electric energy output at the first output power P0 is used to charge the power battery and to meet the power demand of the fuel cell vehicle under the idle condition;

[0056] When the SOC rises from the first preset value to the upper critical value, stop charging the power battery;

[0057] Start the power battery, and output electric energy through the power battery to meet the power demand of the fuel cell vehicle under the idle condition;

[0058] Turn off the fuel cell.

[0059] Preferably, the first power distribution control strategy further includes:

[0060] After the electric energy is output through the power battery to meet the power of the fuel cell vehicle under the idle condition, if the SOC drops from the upper critical value to the lower critical value during the idle condition, start the fuel cell and turn off the power battery;

[0061] Output electric energy through the fuel cell at a second output power P1, and the electric energy output at the second output power P1 is used to charge the power battery and to meet the power demand of the fuel cell vehicle under the idle condition, and the second output power P1 is greater than the first output power P0;

[0062] When the SOC rises from the lower critical value to the upper critical value, stop charging the power battery;

[0063] Start the power battery and output electric energy through the power battery to meet the power demand of the fuel cell vehicle under the idle condition;

[0064] Turn off the fuel cell.

[0065] Preferably, the first power distribution control strategy further includes:

[0066] During the process that the SOC rises from the lower critical value to the upper critical value, when the SOC rises from the lower critical value to the first preset value, lower the second output power P1 of the fuel cell to the first output power P0.

[0067] Preferably, the power distribution control strategy formulation module 22 includes a second formulation sub-module 222, and the second formulation sub-module 222 is used for:

[0068] When the fuel cell vehicle is in the idle condition, if the SOC is at the lower critical value, formulate a second power distribution control strategy for the fuel cell and the power battery, and the second power distribution control strategy includes:

[0069] Set the power battery to a non-working state, output electric energy through the fuel cell at a second output power P1, and the electric energy output at the second output power P1 is used to charge the power battery and to meet the power demand of the fuel cell vehicle under the idle condition;

[0070] When the SOC rises from the lower critical value to the upper critical value, stop charging the power battery;

[0071] Start the power battery and output power from the power battery to meet the power demand of the fuel cell vehicle under the idle condition;

[0072] Turn off the fuel cell.

[0073] Preferably, the second power distribution control strategy further includes:

[0074] During the process that the SOC rises from the lower critical value to the upper critical value, when the SOC rises from the lower critical value to a first preset value, reduce the second output power P1 of the fuel cell to a first output power P0, where the first preset value is higher than the lower critical value and lower than the upper critical value.

[0075] The beneficial technical effects achieved by the embodiments of the present invention are as follows:

[0076] 1. Prevent membrane drying: When the fuel cell vehicle is idling, according to the state of charge of the power battery, formulate a reasonable power distribution control strategy for the fuel cell and the power battery, manage the energy output of the fuel cell according to the power distribution control strategy, reduce the load of the fuel cell, prevent the fuel cell membrane from drying due to insufficient generation of reaction water, and improve the performance of the fuel cell.

[0077] 2. Improve system efficiency: Avoid the long-term operation of the fuel cell under low-power conditions, reduce hydrogen consumption through dynamic adjustment, and improve the overall energy efficiency.

[0078] 3. Prolong the service life of the fuel cell and the power battery: By intelligently distributing the loads of the fuel cell and the power battery, avoid the overuse of the fuel cell stack and the battery pack, and prolong the service life of the system.

[0079] The above technical solutions of the embodiments of the present invention will be described in detail below in conjunction with specific application examples. For technical details not introduced during the implementation process, reference can be made to the relevant descriptions above.

[0080] The method for power battery power distribution when the fuel cell vehicle of the present invention is idling, because both the fuel cell and the power battery can independently provide energy, is applicable to the power distribution control in the fuel cell and power battery hybrid system. Through relevant power distribution control strategies, optimize the power distribution between the fuel cell and the power battery when the fuel cell vehicle is idling, ensure that under the vehicle idling condition, the power output of the fuel cell can be reasonably adjusted, and use the power battery to provide idling power support for the vehicle, preventing the fuel cell membrane from drying and hydrogen waste. Realize the working state control of the fuel cell, the balanced power control of the fuel cell, and the intelligent power distribution control of the fuel cell when the fuel cell vehicle is idling, so as to solve the problem of fuel cell membrane drying, thereby improving the overall system efficiency and prolonging the service life of the fuel cell.

[0081] 1. Idle Power Management

[0082] When the vehicle is in the idle condition, the fuel cell outputs at a low power P0. P0 is mainly used to charge the power battery and a small part is used to provide power for the vehicle. In this stage, the fuel cell operates at a low load to avoid excessive drying of the membrane.

[0083] 2. Power Battery Charging and Idle Support

[0084] When the SOC of the power battery is lower than the preset value, the fuel cell charges the power battery by outputting power P0 (mainly depending on the power demand and design goal of the fuel cell vehicle) until the power battery reaches the charging threshold. After the power battery reaches this charging threshold, the power battery will take over the function of the fuel cell and start to provide the power required during idling. Under the idle condition, there is no power demand for the fuel cell vehicle or only a small number of auxiliary devices are operating. SOC refers to the percentage of the current remaining power of the current power battery relative to its total capacity. Setting the SOC between 45% - 75% keeps the battery in an efficient and safe state.

[0085] 3. Power Dynamic Regulation

[0086] When the SOC of the power battery drops to the critical value, the VCU (Vehicle Control Unit) detects that the power of the power battery is insufficient, and the power output of the fuel cell increases to P1, which not only meets the power demand during idling but also replenishes the power of the power battery. When the SOC of the power battery rises to the upper critical value, the power battery takes over the function of the fuel cell to provide the power required during idling.

[0087] The VCU dynamically regulates the power distribution between the fuel cell and the power battery according to the real-time load demand of the system and the state of the power battery to ensure the optimal overall energy efficiency of the system.

[0088] 4. Intelligent Control Strategy

[0089] The VCU control system will reasonably distribute the power output of the fuel cell and the power battery based on the SOC of the power battery and the real-time power demand of the vehicle, avoid the fuel cell running at an inefficient state for a long time, and effectively extend the service life of the fuel cell stack and the power battery.

[0090] Specifically, during idling, the fuel cell power P0 provides both power and small - power charging for the power battery. When it reaches 75%, the fuel cell shuts down and the power battery provides power. When the power battery drops to 45%, the fuel cell starts, provides power P1 to provide power and charge the power battery with high power, so that it returns to the most reasonable power storage range of 55%, and then the fuel cell returns to power P0.

[0091] Under idling conditions, the required power of the whole vehicle changes, and the fuel cell power is adjusted according to the demand.

[0092] The flowchart of the fuel cell idling power distribution control is as Figure 3 shown. This flowchart demonstrates the power distribution control logic between the fuel cell and the power battery under idling conditions. First, after the vehicle starts, the fuel cell operates at the idling power P0 and begins to charge the power battery. When the power battery is fully charged, the VCU (Vehicle Control Unit) shuts down the BOP (Balance of Plant) and stops the power output of the fuel cell.

[0093] Next, when the SOC (State of Charge) of the power battery drops, the VCU detects the change in SOC and increases the power output of the fuel cell to P1 to continue providing power support for the power battery. At the same time, the power battery also supplies power for idling. When the system detects that the SOC of the power battery reaches the balanced state, the whole system enters the stable operation stage. The role of the VCU is to dynamically adjust the power distribution between the fuel cell and the power battery throughout the process to ensure the optimal energy efficiency.

[0094] Figure 4 It shows the power distribution control process between the fuel cell and the power battery under idling conditions. Figure 4 It shows the change in the fuel cell power: The fuel cell initially operates at the idling power P0. When the BOP is shut down, the power of the fuel cell drops to zero, and then the power of the fuel cell increases again to supply power to the power battery.

[0095] Figure 5 It shows the power control process of the power battery under idling conditions. Figure 5 It shows the change in the SOC of the power battery: The SOC of the power battery rises in the initial stage, indicating that the fuel cell is charging it. Reaching the peak means the power battery is fully charged. Subsequently, the SOC drops to a certain level (the battery discharges) and then stabilizes (recharges to stability), reflecting the charge and discharge process of the power battery.

[0096] Through Figure 4 and Figure 5 Combined, it shows the collaborative working mechanism between the fuel cell and the power battery under idling conditions.

[0097] It should be understood that the specific order or hierarchy of the steps in the disclosed process is an example of an exemplary method. Based on design preferences, it should be understood that the specific order or hierarchy of the steps in the process can be rearranged without departing from the protection scope of the present disclosure. The appended method claims present the elements of the various steps in an exemplary order and are not intended to be limited to the specific order or hierarchy described.

[0098] In the above detailed description, various features are combined together in a single embodiment to simplify the present disclosure. This method of disclosure should not be construed as reflecting an intention that the embodiments of the claimed subject matter require more features than those clearly recited in each claim. On the contrary, as reflected by the appended claims, the invention lies in a state less than all the features of the single disclosed embodiment. Accordingly, the appended claims are hereby expressly incorporated into the detailed description, where each claim stands alone as a separate preferred embodiment of the invention.

[0099] The above-described disclosed embodiments are described to enable any person skilled in the art to implement or use the present invention. For those skilled in the art, various modification manners of these embodiments are obvious, and the general principles defined herein can also be applied to other embodiments without departing from the spirit and protection scope of the present disclosure. Therefore, the present disclosure is not limited to the embodiments given herein, but is consistent with the broadest scope of the principles and novel features disclosed in this application.

[0100] The above description includes examples of one or more embodiments. Of course, it is impossible to describe all possible combinations of components or methods for the purpose of describing the above embodiments, but those of ordinary skill in the art should recognize that each embodiment can be further combined and arranged. Therefore, the embodiments described herein are intended to cover all such changes, modifications, and variations that fall within the protection scope of the appended claims. In addition, with respect to the term "comprising" used in the specification or claims, the manner in which this term is encompassed is similar to the term "including", as interpreted when "including" is used as a transitional word in the claims. In addition, any use of the term "or" in the specification or claims of the patent application is to mean "non-exclusive or".

[0101] The specific embodiments described above further elaborate on the purpose, technical solutions, and beneficial effects of the present invention. It should be understood that the above description is only the specific embodiments of the present invention and is not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for distributing battery power when a fuel cell vehicle is idling, characterized in that: include: For a fuel cell vehicle, obtaining a state of charge SOC of a power battery monitored by a vehicle control unit provided in the fuel cell vehicle; When the fuel cell vehicle is in an idling condition, a power distribution control strategy between the fuel cell and the power battery is formulated according to the power state SOC of the power battery. In the power distribution control strategy, it is possible to determine according to the power state SOC of the power battery: whether to use the power battery to distribute the fuel cell for power output, and a method of using the power battery to distribute the fuel cell for power output; The relevant power distribution control strategy is sent to the vehicle control unit, and the relevant power distribution control strategy is used by the vehicle control unit to use the fuel cell or the power battery or the fuel cell and the power battery in combination to provide power for the fuel cell vehicle based on the distribution control strategy, so as to dynamically meet the idling demand of the fuel cell vehicle; The power battery state of charge SOC indicates the percentage of the current remaining power of the power battery relative to the total capacity of the power battery. When the lower critical value ≤ SOC ≤ upper critical value, the power battery is in a safe and normal power supply state; When the fuel cell vehicle is in an idling condition, formulating a power distribution control strategy between the fuel cell and the power battery according to the state of charge SOC of the power battery includes: When the fuel cell vehicle is in an idling condition, if the SOC is lower than a first preset value, the first preset value is higher than the lower critical value and lower than the upper critical value, a first power distribution control strategy for the fuel cell and the power battery is formulated, and the first power distribution control strategy includes: The power battery is set to a non-operating state, and the fuel cell outputs electric energy at a first output power P0, and the electric energy output at the first output power P0 is used to charge the power battery and to meet the power demand of the fuel cell vehicle under an idling condition; When the SOC rises from the first preset value to the upper critical value, stopping charging the power battery; Starting the power battery, and outputting electric energy through the power battery to meet the power demand of the fuel cell vehicle under idling conditions; shutting down the fuel cell; The first power allocation control strategy also includes: After the power battery outputs electric energy to meet the power of the fuel cell vehicle under the idle condition, if the SOC drops from the upper threshold value to the lower threshold value during the idle condition, starting the fuel cell and shutting down the power battery; Outputting electric energy at a second output power P1 through the fuel cell, the electric energy output at the second output power P1 is used to charge the power battery and to meet the power demand of the fuel cell vehicle under idling conditions, the second output power P1 being greater than the first output power P0; When the SOC rises from the lower critical value to the upper critical value, stopping charging the power battery; Starting the power battery, and outputting electric energy through the power battery to meet the power demand of the fuel cell vehicle under idling conditions; The fuel cell is shut down.

2. The method for distributing battery power when a fuel cell vehicle is idling according to claim 1, characterized in that: The first power allocation control strategy also includes: In the process that the SOC increases from the lower critical value to the upper critical value, when the SOC increases from the lower critical value to the first preset value, the second output power P1 of the fuel cell is reduced to the first output power P0.

3. The method for distributing battery power when a fuel cell vehicle is idling according to claim 1, characterized in that: When the fuel cell vehicle is in an idling condition, formulating a power distribution control strategy between the fuel cell and the power battery according to the state of charge SOC of the power battery includes: When the fuel cell vehicle is in an idling condition, if the SOC is a lower critical value, a second power distribution control strategy for the fuel cell and the power battery is formulated, and the second power distribution control strategy includes: The power battery is set to a non-operating state, and the fuel cell outputs electric energy at a second output power P1, and the electric energy output at the second output power P1 is used to charge the power battery and to meet the power demand of the fuel cell vehicle under an idling condition; When the SOC rises from the lower critical value to the upper critical value, stopping charging the power battery; Starting the power battery, and outputting electric energy through the power battery to meet the power demand of the fuel cell vehicle under idling conditions; The fuel cell is shut down.

4. The method for distributing battery power when a fuel cell vehicle is idling according to claim 3, characterized in that: The second power allocation control strategy also includes: In the process of the SOC rising from the lower critical value to the upper critical value, when the SOC rises from the lower critical value to a first preset value, the second output power P1 of the fuel cell is reduced to a first output power P0, and the first preset value is higher than the lower critical value and lower than the upper critical value.

5. A battery power distribution device for a fuel cell vehicle when idling, characterized in that: include: An information acquisition module, for acquiring, for a fuel cell vehicle, a state of charge SOC of a power battery monitored by a vehicle control unit disposed in the fuel cell vehicle; A power distribution control strategy formulation module, used for formulating the relevant power distribution control strategy between the fuel cell and the power battery according to the power state SOC of the power battery when the fuel cell vehicle is in an idle condition, wherein in the relevant power distribution control strategy, it is possible to determine according to the power state SOC of the power battery: whether to use the power battery to distribute the fuel cell for power output, and the method of using the power battery to distribute the fuel cell for power output; A power distribution control strategy sending module, used to send the relevant power distribution control strategy to the vehicle control unit, wherein the relevant power distribution control strategy is used by the vehicle control unit to use the fuel cell or the power battery or the fuel cell and the power battery in combination to provide power for the fuel cell vehicle based on the distribution control strategy, so as to dynamically meet the idling demand of the fuel cell vehicle; The power battery state of charge SOC indicates the percentage of the current remaining power of the power battery relative to the total capacity of the power battery. When the lower critical value ≤ SOC ≤ upper critical value, the power battery is in a safe and normal power supply state; The power allocation control strategy formulation module includes a first formulation submodule, and the first formulation submodule is used to: When the fuel cell vehicle is in an idling condition, if the SOC is lower than a first preset value, the first preset value is higher than the lower critical value and lower than the upper critical value, a first power distribution control strategy for the fuel cell and the power battery is formulated, and the first power distribution control strategy includes: The power battery is set to a non-operating state, and the fuel cell outputs electric energy at a first output power P0, and the electric energy output at the first output power P0 is used to charge the power battery and to meet the power demand of the fuel cell vehicle under an idling condition; When the SOC rises from the first preset value to the upper critical value, stopping charging the power battery; Starting the power battery, and outputting electric energy through the power battery to meet the power demand of the fuel cell vehicle under idling conditions; shutting down the fuel cell; The first power allocation control strategy also includes: After the power battery outputs electric energy to meet the power of the fuel cell vehicle under the idle condition, if the SOC drops from the upper threshold value to the lower threshold value during the idle condition, starting the fuel cell and shutting down the power battery; Outputting electric energy at a second output power P1 through the fuel cell, the electric energy output at the second output power P1 is used to charge the power battery and to meet the power demand of the fuel cell vehicle under idling conditions, the second output power P1 being greater than the first output power P0; When the SOC rises from the lower critical value to the upper critical value, stopping charging the power battery; Starting the power battery, and outputting electric energy through the power battery to meet the power demand of the fuel cell vehicle under idling conditions; The fuel cell is shut down.

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