Battery power distribution method and distribution device during idle speed of fuel cell vehicle

Abstract

The embodiment of the invention provides a battery power distribution method and device during idle speed of a fuel cell vehicle, and relates to the technical field of new energy automobiles, and the method comprises the steps: for the fuel cell vehicle, obtaining the electric quantity state of a power battery monitored by a vehicle control unit arranged in the fuel cell vehicle; the method comprises the following steps: when a fuel cell vehicle is in an idling working condition, formulating a related power distribution control strategy of a fuel cell and a power cell according to the electric quantity state of the power cell, and in the formulated related power distribution control strategy of the fuel cell and the power cell, according to the electric quantity state of the power battery, whether the power battery is used for distributing the fuel battery for electric energy output or not and the method for distributing the fuel battery for electric energy output according to the power battery can be determined; the energy output of the fuel cell is managed according to the power distribution control strategy, the load of the fuel cell is reduced, the fuel cell membrane is prevented from being dried due to insufficient reaction water generation amount, and the performance of the fuel cell is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy vehicles, and in particular to a method and a device for distributing battery power when a fuel cell vehicle is idling. Background Art

[0002] Fuel cell vehicles use fuel to operate the vehicle. Fuel cells generate electricity through hydrogen-oxygen reactions, and power batteries drive the system with the electricity they store. In the process of implementing the present invention, the applicant found that the prior art has at least the following problems: In the prior art, when a fuel cell vehicle is idling, the gas supply to the fuel cell is large, while the amount of water generated by the electrochemical reaction is small, which makes the fuel cell membrane easy to dry, thereby affecting the conductivity of the proton exchange membrane, reducing the performance of the fuel cell, and consuming the life of the fuel cell. At the same time, when the vehicle is idling, the fuel cell needs to maintain basic power output to keep the system running, but the efficiency of the fuel cell stack under low load is low, which easily leads to problems of hydrogen waste and performance degradation. Summary of the invention

[0003] The embodiments of the present invention provide a battery power distribution method and distribution device when a fuel cell vehicle is idling, which can solve the technical problems in the prior art that "the fuel cell membrane is 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 basic power output to maintain system operation, but the fuel cell stack efficiency is low under low load, which easily leads to hydrogen waste and performance degradation."

[0004] To achieve the above-mentioned purpose, on the one hand, an embodiment of the present invention provides a method for distributing battery power when a fuel cell vehicle is idling, comprising: 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. The relevant power distribution control strategy is used by the vehicle control unit to adopt a fuel cell or a power battery or a combination of a fuel cell and a power battery to provide power for the fuel cell vehicle based on the distribution control strategy, so as to dynamically meet the idling requirements of the fuel cell vehicle.

[0005] On the other hand, an embodiment of the present invention provides a battery power distribution device for a fuel cell vehicle when idling, characterized in that it includes: 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, in which the relevant power distribution control strategy can determine according to the power state OC 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 is used to send the relevant power distribution control strategy to the vehicle control unit. The relevant power distribution control strategy is used by the vehicle control unit to adopt 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 requirements of the fuel cell vehicle.

[0006] 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 power state of the power battery, and the energy output of the fuel cell is managed according to the power distribution control strategy to reduce the load on the fuel cell, prevent the fuel cell membrane from drying out due to insufficient reaction water generation, and improve the performance of the fuel cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0008] Figure 1 is a flow chart of a method for distributing battery power when a fuel cell vehicle is idling according to an embodiment of the present invention; Figure 2 This 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; Figure 3 is a complete flow chart of idle power distribution control of a fuel cell according to an embodiment of the present invention; Figure 4This is the power distribution control process of the fuel cell and the power battery under the idle condition of the embodiment of the present invention; Figure 5 This is the power control process of the power battery under idle conditions in an embodiment of the present invention. DETAILED DESCRIPTION

[0009] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0010] like Figure 1 As shown, in combination with an embodiment of the present invention, a method for distributing battery power when a fuel cell vehicle is idling is provided, comprising: S101: 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; S102: 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, in which the power distribution control strategy between the fuel cell and the power battery can be determined according to the state of charge SOC of the power battery: whether to use the power battery to distribute the fuel cell for power output, and a method for using the power battery to distribute the fuel cell for power output; S103: Send the relevant power distribution control strategy to the vehicle control unit, and the relevant power distribution control strategy is used by the vehicle control unit to adopt 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 requirement of the fuel cell vehicle.

[0011] 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 a lower critical value ≤ SOC ≤ upper critical value, the power battery is in a safe and normal power supply state.

[0012] Preferably, S102: 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, including: 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 between 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; The fuel cell is shut down.

[0013] Preferably, the first power allocation control strategy further 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.

[0014] Preferably, the first power allocation control strategy further 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.

[0015] Preferably, S102: 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, including: 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.

[0016] Preferably, the second power allocation control strategy further 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.

[0017] like Figure 2 As shown, in combination with an embodiment of the present invention, a battery power distribution device for a fuel cell vehicle when idling is provided, comprising: The information acquisition module 21 is used to acquire, for a fuel cell vehicle, a state of charge SOC of a power battery monitored by a vehicle control unit provided in the fuel cell vehicle; A power distribution control strategy formulation module 22 is used to formulate a power distribution control strategy related to 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. In the formulated power distribution control strategy related to the fuel cell and the power battery, it is possible to determine according to the power state of the power battery: whether to use the power battery to distribute the fuel cell for power output, and a method for using the power battery to distribute the fuel cell for power output; The power distribution control strategy sending module 23 is used to send the relevant power distribution control strategy to the vehicle control unit. The relevant power distribution control strategy is used by the vehicle control unit to adopt 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 requirements of the fuel cell vehicle.

[0018] 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 a lower critical value ≤ SOC ≤ upper critical value, the power battery is in a safe and normal power supply state.

[0019] Preferably, the power allocation control strategy formulation module 22 includes a first formulation submodule 221, and the first formulation submodule 221 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 between 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; The fuel cell is shut down.

[0020] Preferably, the first power allocation control strategy further 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.

[0021] Preferably, the first power allocation control strategy further 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.

[0022] Preferably, the power allocation control strategy formulation module 22 includes a second formulation submodule 222, and the second formulation submodule 222 is used to: 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 power through the power battery to meet the power demand of the fuel cell vehicle under idling conditions; The fuel cell is shut down.

[0023] Preferably, the second power allocation control strategy further 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.

[0024] The beneficial technical effects achieved by the embodiments of the present invention are as follows: 1. Prevent membrane drying: When the fuel cell vehicle is idling, formulate a reasonable power distribution control strategy for the fuel cell and the power battery according to the power state of 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 reaction water generation, and improve the performance of the fuel cell.

[0025] 2. Improve system efficiency: Avoid long-term operation of fuel cells under low-power conditions, reduce hydrogen consumption through dynamic adjustment, and improve overall energy efficiency.

[0026] 3. Extend the life of fuel cells and power batteries: By intelligently distributing the load of fuel cells and power batteries, excessive use of battery stacks and battery groups can be avoided, thus extending the life of the system.

[0027] The above technical solution of the embodiment of the present invention is described in detail below in conjunction with specific application examples. For technical details not introduced during the implementation process, please refer to the relevant description in the previous text.

[0028] The battery power distribution method for fuel cell vehicles at idle speed implemented by the present invention is suitable for power distribution control in a fuel cell and power battery hybrid power system because both the fuel cell and the power battery can provide energy independently. The power distribution of the fuel cell and the power battery is optimized when the fuel cell vehicle is idling through the relevant power distribution control strategy, ensuring that the power output of the fuel cell can be reasonably adjusted under the vehicle idling condition, and the power battery is used to provide idle power support for the vehicle to prevent the fuel cell membrane from drying out and hydrogen waste. 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 are realized when the fuel cell vehicle is idling, so as to solve the problem of fuel cell membrane drying, thereby improving the overall efficiency of the system and extending the life of the fuel cell.

[0029] 1. Idle power management When the vehicle is idling, the fuel cell outputs at a lower power P0, which is mainly used to charge the power battery and provide a small part of the vehicle's power. During this stage, the fuel cell maintains low load operation to avoid excessive drying of the membrane.

[0030] 2. Power battery charging and idling support 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 goals of the fuel cell vehicle) until the power battery reaches the charging threshold. After the power battery reaches the charging threshold, the power battery will take over the function of the fuel cell and start to provide the vehicle with the power required for idling. Under idling conditions, the fuel cell vehicle has no power demand or only a small number of auxiliary devices are running. SOC refers to the current remaining power of the power battery as a percentage of its total capacity. Setting the SOC between 45% and 75% keeps the battery in an efficient and safe state.

[0031] 3. Dynamic power adjustment When the SOC of the power battery drops to a critical value, the VCU (vehicle control unit) detects that 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 vehicle with the power required during idling.

[0032] The VCU dynamically adjusts the power distribution between the fuel cell and the power battery according to the system's real-time load demand and the status of the power battery to ensure optimal overall system energy efficiency.

[0033] 4. Intelligent control strategy The VCU control system will reasonably allocate 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, avoiding the fuel cell from running in an inefficient state for a long time, while effectively extending the service life of the fuel cell stack and the power battery.

[0034] Specifically, at idle speed, the fuel cell P0 power provides both power and low-power power battery charging. 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 up, providing P1 power to provide power and high power to charge the power battery, returning it to the most reasonable power battery energy storage range of 55%, and then allowing the fuel cell to return to P0 power.

[0035] When idling, the power demand of the vehicle will change, and the fuel cell power will be adjusted according to the needs.

[0036] The flowchart of fuel cell idle power distribution control is as follows: Figure 3 As shown in the figure, the flow chart shows the power distribution control logic between the fuel cell and the power battery under idle conditions. First, after the vehicle is started, the fuel cell runs at idle power P0 and starts charging the power battery. When the power battery is fully charged, the VCU (vehicle control unit) turns off the BOP (Balance of Plant) and stops the power output of the fuel cell.

[0037] Next, when the SOC (State of Charge) of the power battery decreases, the VCU detects the change in SOC and increases the power output of the fuel cell to P1 to continue to provide power support for the power battery. At the same time, the power battery also provides power for idling. When the system detects that the power battery SOC reaches a balanced state, the entire system enters a 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 optimal energy efficiency.

[0038] Figure 4 The power distribution control process of the fuel cell and the power battery under idling conditions is demonstrated. Figure 4 The change of fuel cell power is shown in Figure 1: the fuel cell initially operates at idle power P0, the fuel cell power drops to zero when the BOP is closed, and then the fuel cell power increases again to supply power to the power battery.

[0039] Figure 5 Demonstrates the power control process of the power battery under idling conditions. Figure 5The change of SOC of the power battery is shown in the figure: the SOC of the power battery rises in the initial stage, indicating that the fuel cell is charging it, and reaches a peak, indicating that the power battery is fully charged. Then the SOC drops to a certain level (battery discharge) and then stabilizes (recharges to stability), reflecting the charge and discharge process of the power battery.

[0040] pass Figure 4 and Figure 5 The combined working mechanism of the fuel cell and the power battery under idling state is demonstrated.

[0041] It should be understood that the specific order or hierarchy of 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 steps in the process can be rearranged without departing from the scope of protection of the present disclosure. The attached 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.

[0042] In the above detailed description, various features are grouped together in a single embodiment to simplify the disclosure. This method of disclosure should not be interpreted as reflecting an intention that the embodiments of the claimed subject matter require more features than are clearly stated in each claim. On the contrary, as reflected in the appended claims, the invention is in a state of having less than all the features of the disclosed individual embodiments. Therefore, the appended claims are hereby expressly incorporated into the detailed description, with each claim standing on its own as a separate preferred embodiment of the invention.

[0043] The disclosed embodiments are described above to enable any person skilled in the art to implement or use the present invention. Various modifications of these embodiments are obvious to those skilled in the art, and the general principles defined herein may also be applied to other embodiments without departing from the spirit and 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.

[0044] 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 it should be recognized by those skilled in the art that the various embodiments may be further combined and arranged. Therefore, the embodiments described herein are intended to cover all such changes, modifications and variations that fall within the scope of protection of the appended claims. In addition, with respect to the term "comprising" used in the specification or claims, the word is covered in a manner similar to the term "including", just as "including," is explained as a transitional word in the claims. In addition, any term "or" used in the specification of the claims is intended to mean "non-exclusive or".

[0045] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection 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. The relevant power distribution control strategy is used by the vehicle control unit to adopt 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 requirements of the fuel cell vehicle.

2. The method for distributing battery power when a fuel cell vehicle is idling according to claim 1, characterized in that: The state of charge SOC of the power battery indicates the percentage of the current remaining power of the power battery relative to the total capacity of the power battery. When a lower critical value ≤ SOC ≤ upper critical value, the power battery is in a safe and normal power supply state.

3. The method for distributing battery power when a fuel cell vehicle is idling according to claim 2, 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 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; 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 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.

5. The method for distributing battery power when a fuel cell vehicle is idling according to claim 4, 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.

6. The method for distributing battery power when a fuel cell vehicle is idling according to claim 2, 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.

7. The method for distributing battery power when a fuel cell vehicle is idling according to claim 6, 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.

8. 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 is used to send the relevant power distribution control strategy to the vehicle control unit. The relevant power distribution control strategy is used by the vehicle control unit to adopt 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 requirements of the fuel cell vehicle.

9. The battery power distribution device for a fuel cell vehicle at idle speed according to claim 8, characterized in that: The state of charge SOC of the power battery indicates the percentage of the current remaining power of the power battery relative to the total capacity of the power battery. When a lower critical value ≤ SOC ≤ upper critical value, the power battery is in a safe and normal power supply state.

10. The battery power distribution device for a fuel cell vehicle at idle speed according to claim 9, characterized in that: 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; The fuel cell is shut down.

Images