A humidity conditioning device and method for a fuel cell

Abstract

The application provides a humidity control device for a fuel cell, and belongs to the technical field of fuel cell water balance, and solves the problem that the prior art cannot cope with complex electrical environments. The device comprises a data acquisition device, a controller and an execution mechanism. The data acquisition device acquires the humidity of the hydrogen gas being injected at the anode outlet of the stack and the current or power of the hydrogen circulation pump in the fuel cell in real time; the controller judges whether the humidity inside the fuel cell stack needs to be adjusted according to the humidity of the hydrogen gas being injected at the anode outlet of the stack at the current time; and if adjustment is needed, the controller controls the execution mechanism to adjust the corresponding target control parameter at the next time of the current time, so as to change the humidity inside the stack, and judges whether the humidity inside the stack reaches a balanced state according to the real-time change of the current or power of the hydrogen circulation pump during the adjustment process, and is closed after the balanced state is reached. The device can adapt to different climates, and improves the reliability and durability of the fuel cell operation.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fuel cell water balance, in particular to a humidity control device and method for fuel cell. BACKGROUND

[0002] With the strategic goal of carbon neutrality proposed by the country, fuel cells as ultimate clean energy are vigorously promoted in road and rail transportation. In order to rival traditional automobile engines, fuel cell engines are required to achieve long service life and high reliability. As a complex coupled system, effective water management is the only way to achieve long service life of the system, so many fuel cell enterprises and colleges have invested a lot of manpower and resources to study it.

[0003] Currently, the industry realizes the internal humidity monitoring and water management closed-loop control of the stack mostly based on the online lithium battery impedance spectrum (EIS) technology based on DC disturbance or CVM (cloud server) electrical disturbance.

[0004] The implementation of EIS technology requires complex electrical hardware design and a large amount of data calibration modeling, which is difficult to develop and has high cost. At the same time, for fuel cell system enterprises, platform products need to adapt to different customer vehicles, and in the face of uncontrollable complex electrical environment, the current developed EIS monitoring technology still has reliability problems. SUMMARY

[0005] The embodiments of the present application aim to provide a humidity control device and method for fuel cell to solve the problem that the prior art cannot cope with complex electrical environment.

[0006] In one aspect, the embodiments of the present application provide a humidity control device for fuel cell, comprising:

[0007] A data acquisition device is configured to acquire the humidity of the injected hydrogen at the anode outlet of the stack and the current or power of the hydrogen circulation pump in the fuel cell in real time and send them to a controller.

[0008] The controller is configured to determine whether the internal humidity of the fuel cell stack needs to be adjusted according to the humidity of the injected hydrogen at the anode outlet of the stack at the current time, and if adjustment is needed, control an actuator to adjust the corresponding target control parameter at the next time of the current time to change the internal humidity of the stack, and determine whether the internal humidity of the stack reaches a balanced state according to the real-time change of the current or power of the hydrogen circulation pump during the adjustment process, and turn off after the balanced state is reached.

[0009] The actuator is configured to be started by the controller to adjust the internal humidity of the stack.

[0010] The beneficial effects of the above technical solution are as follows: without introducing new hardware, the relationship between the circulating pump current and the gas humidity of the current fuel cell system is fully utilized, and the water balance of the fuel cell system is steadily controlled according to the change trend of the circulating pump current over time.

[0011] Based on the further improvement of the above device, the data acquisition device further comprises:

[0012] A current and power measuring device is arranged at the input end of the hydrogen circulating pump in the fuel cell, and is used to acquire the operating current and power of the hydrogen circulating pump in real time and send them to the controller.

[0013] A humidity sensor is arranged at the anode inlet of the fuel cell, and is used to acquire the humidity of the injected hydrogen at the anode outlet of the fuel cell stack in real time and send it to the controller.

[0014] The beneficial effects of the above further improvement scheme are that the type and layout position of the data acquisition device are limited. The operating current and power of the hydrogen circulating pump can be acquired by the current and power measuring device, and the humidity of the injected hydrogen at the anode outlet of the fuel cell stack can be acquired by the humidity sensor, thereby laying a solid foundation for subsequent accurate water balance control.

[0015] The execution mechanism comprises:

[0016] An exhaust valve control unit is used to control the opening and closing of the hydrogen exhaust valve connected to the stack in the fuel cell.

[0017] A temperature control unit is used to increase or decrease the temperature in the stack by controlling the rotating speed of the heat dissipation fan in the fuel cell.

[0018] A gas supply control unit is used to increase or decrease the gas supply measurement ratio of the stack by controlling the rotating speed of the air compressor and the opening degree of the air throttle in the fuel cell.

[0019] The beneficial effects of the above further improvement scheme are that the types and respective functions of the execution mechanisms are limited. The water balance of the fuel cell system can be fully ensured by controlling the air valve, the temperature, and the gas supply.

[0020] The controller further comprises:

[0021] A data transceiver module is used to receive the humidity of the injected hydrogen at the anode outlet of the stack and the current or power of the hydrogen circulating pump in the fuel cell, and send the humidity to the analysis control module and send the current or power to the balance monitoring module according to the request of the balance monitoring module.

[0022] The analysis control module is configured to compare the humidity of the hydrogen gas drawn at the anode outlet of the fuel cell stack at the current time with a preset threshold value, determine whether the humidity inside the fuel cell stack needs to be adjusted, and if so, start the balance monitoring module and control the actuator to adjust the corresponding target control parameter at the next time of the current time according to a preset scheme until receiving the balance instruction from the balance monitoring module and issuing a closing instruction to the actuator; the target control parameter includes at least one of the temperature inside the stack, the air supply metering ratio, and the exhaust valve opening time ratio.

[0023] The balance monitoring module is configured to, after being started, send a request to the data transceiver module to obtain the current of the hydrogen circulation pump or the power of the hydrogen circulation pump, compare the rate of change of the current or the power of the hydrogen circulation pump in a preset period of time from the current time with a preset threshold value, determine whether the humidity inside the stack reaches a balanced state, and immediately send a balance instruction to the analysis control module once the balanced state is reached.

[0024] The beneficial effects of the further improved scheme are that the structure of the controller and the functions of the modules are limited. The analysis control module can determine whether the humidity inside the fuel cell stack needs to be adjusted by analyzing the humidity of the hydrogen gas drawn at the anode outlet of the fuel cell stack at the current time. If adjustment is needed, the balance monitoring module is started to monitor the rate of change of the current or the power of the hydrogen circulation pump in a preset period of time from the current time to determine the end time of the adjustment process. The control is ended until the fuel cell system reaches a hydrostatic balance (i.e., the humidity inside the stack reaches a balanced state).

[0025] The analysis control module executes the following program:

[0026] Obtain the humidity a of the hydrogen gas drawn at the anode outlet of the fuel cell stack at the current time;

[0027] Compare the humidity a with a preset threshold value A to determine whether the humidity inside the fuel cell stack needs to be adjusted; when a = A, no adjustment is needed, otherwise the balance monitoring module is started and the next step is executed;

[0028] When a > A, it is determined that the stack is humid, and the actuator is controlled to execute the following scheme: increase the speed of the air compressor and the opening degree of the throttle, increase the air supply metering ratio; or increase the response of the cooling fan to increase the temperature inside the stack; or shorten the opening gap length of the exhaust valve to increase the opening time ratio of the hydrogen exhaust valve to improve the humidity inside the stack;

[0029] When a < A, it is determined that the stack is dry, and the actuator is controlled to execute the following scheme: reduce the speed of the air compressor and the opening degree of the throttle, reduce the air supply metering ratio; or reduce the response of the cooling fan to reduce the temperature inside the stack; or increase the opening gap length of the exhaust valve to reduce the opening time ratio of the hydrogen exhaust valve to improve the humidity inside the stack.

[0030] The beneficial effect of the further improved scheme is that the regulation scheme of the analysis control module on humidity is limited, when the stack is wet, the gas supply ratio or the stack temperature or the hydrogen exhaust valve opening time ratio is increased to remove moisture, and when the stack is too dry, the gas supply ratio or the stack temperature or the hydrogen exhaust valve opening time ratio is reduced to increase humidity. The above-mentioned moisture removal and humidification method is obtained by the inventors through a large number of tests, and the effect is reliable and effective.

[0031] When a>A, the analysis control module controls the execution structure to execute the following program:

[0032] Execution scheme one: shorten the exhaust valve opening gap length to increase the hydrogen exhaust valve opening time ratio;

[0033] If the balance instruction sent by the balance monitoring module is received within the preset period of time from the execution of scheme one, the execution mechanism is closed, otherwise, at the end of the preset period of time, the execution mechanism is controlled to execute scheme two: shorten the exhaust valve opening gap length, and increase the air compressor speed and the throttle opening degree;

[0034] If the balance instruction sent by the balance monitoring module is received within the preset period of time from the execution of scheme two, the execution mechanism is closed, otherwise, at the end of the preset period of time, the execution mechanism is controlled to execute scheme three until the balance instruction is received: shorten the exhaust valve opening gap length, increase the air compressor speed and the throttle opening degree, and increase the speed of the cooling fan.

[0035] The beneficial effect of the further improved scheme is that the moisture removal scheme when the stack is wet is further limited, and the influence of schemes one to three on other performances of the stack is from low to high, and the moisture removal capacity is also increased. If the moisture removal effect of scheme one is not rapid, scheme two is started, and if the moisture removal effect is still not rapid after scheme two is executed, scheme three is started.

[0036] When a

[0037] Execution scheme four: increase the exhaust valve opening gap length to reduce the hydrogen exhaust valve opening time ratio;

[0038] If the balance instruction sent by the balance monitoring module is received within the preset period of time from the execution of scheme four, the execution mechanism is closed, otherwise, at the end of the preset period of time, the execution mechanism is controlled to execute scheme five: increase the exhaust valve opening gap length, and reduce the air compressor speed and the throttle opening degree;

[0039] If the balance instruction sent by the balance monitoring module is received within the preset period of time since the scheme five is executed, the execution mechanism is closed, otherwise, at the end of the preset period of time, the execution mechanism is controlled to execute the scheme six until the balance instruction is received: the opening gap length of the exhaust valve is increased, at the same time, the rotation speed of the air compressor and the opening degree of the throttle valve are reduced, and the rotation speed of the cooling fan is reduced.

[0040] The beneficial effect of the further improved scheme is that the humidification scheme when the stack is dry is further limited, the influence of the schemes four to six on other performances of the stack is from low to high, and the humidification capacity is also increased in turn. If the scheme four cannot achieve rapid humidification effect, the scheme five is started, and if the scheme five still cannot achieve rapid dehumidification effect, the scheme six is started.

[0041] The balance monitoring module executes the following program:

[0042] After starting, the data transceiver module is requested to obtain the current or power;

[0043] The current or power of the hydrogen circulating pump within the preset period of time from the current time when the feedback is received is obtained, and the average slope of the current or power within the preset period of time is obtained as the change rate b of the current or power;

[0044] The b is compared with a preset threshold B to determine whether the humidity in the stack reaches a balance state, if the change rate is equal to the preset threshold, it is determined that the balance state is reached, and a balance instruction is immediately sent to the analysis control module, otherwise, it is determined that the balance state is not reached, and the next time is continued to determine until the balance state is reached.

[0045] The beneficial effect of the further improved scheme is that the program executed by the balance monitoring module is limited. B is a related threshold value established according to the characteristics of the circulating pump and the humidity of the gas, and can also be a group of range values set according to different current conditions, which are respectively called in the corresponding conditions. The current or power b of the hydrogen circulating pump within the preset period of time from the current time can accurately determine whether the stack reaches a balance state.

[0046] The humidity control device further comprises an external data display control platform;

[0047] The external data display control platform is used to store and display the humidity of the injected hydrogen at the anode outlet of the stack, the current or power of the hydrogen circulating pump, and the preset scheme currently used by the controller, which are collected in real time by the data acquisition device.

[0048] The beneficial effect of the further improved scheme is that the user can watch the humidity of the hydrogen gas at the anode outlet of the stack, the current or power of the hydrogen circulation pump, and the preset scheme currently adopted by the controller in real time through the external data display control platform, so as to know the real-time state of the humidity regulation of the fuel cell.

[0049] In another aspect, the embodiment of the present application provides a humidity regulation method for a fuel cell, comprising the following steps:

[0050] Obtaining the humidity of the hydrogen gas at the anode outlet of the stack at the current time;

[0051] Determining whether the humidity inside the fuel cell stack needs to be adjusted according to the humidity; if the humidity needs to be adjusted, the next step is executed, otherwise, the next cycle of the judgment is entered;

[0052] Controlling the adjusting of the corresponding target control parameter at the next time of the current time by the execution mechanism, so as to change the humidity inside the stack; the target control parameter comprises at least one of the opening time ratio of the hydrogen exhaust valve, the gas supply metering ratio, the stack temperature, and the gas supply pressure;

[0053] Obtaining the current or power of the hydrogen circulation pump of the fuel cell at the adjusting time, determining whether the humidity inside the stack reaches a balanced state according to the real-time change of the current or power, and ending the control of the execution mechanism after the balanced state is reached.

[0054] The beneficial effect of the above technical scheme is as follows: the relationship between the current of the circulation pump and the gas humidity of the current fuel cell system is fully utilized, and the water balance of the fuel cell system is steadily regulated according to the change trend of the current of the circulation pump over time.

[0055] The summary is provided to introduce selected concepts in a simplified form, which will be further described below in the detailed description. The summary is not intended to identify key or essential features of the disclosure, nor is it intended to limit the scope of the disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0056] The above and other objects, features and advantages of the present disclosure will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which like reference characters refer to like parts throughout the several views.

[0057] Figure 1 A structure schematic diagram of the humidity regulation device of the embodiment 1 of the present application is shown;

[0058] Figure 2 A structure schematic diagram of the humidity regulation device of the embodiment 2 of the present application is shown. DETAILED DESCRIPTION

[0059] Embodiments of the present disclosure will be described below in greater detail with reference to the accompanying drawings. While embodiments of the present disclosure are shown in the drawings, it is understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure will be thorough and complete, and will fully convey the scope of the present disclosure to those skilled in the art.

[0060] The term "comprising" and variations thereof as used herein are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements is not necessarily limited to those elements, but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. Unless otherwise specified, the term "or" as used herein is intended to mean "and / or". The term "based on" means "based, at least in part, on". The terms "one example embodiment" and "an example embodiment" mean "at least one example embodiment". The term "another embodiment" means "at least one additional embodiment". The terms "first", "second", and the like can refer to different or the same objects. Other explicit or implicit definitions can also be included below.

[0061] It should be noted that the fuel cell in the embodiment adopts an existing fuel cell system, for example, as described in CN201810252908.X. The specific structure and functions of the components can be understood by those skilled in the art, and will not be described hereinafter.

[0062] Embodiment 1

[0063] In one specific embodiment of the present application, a humidity control device for a fuel cell is disclosed, as shown in Figure 1 which comprises, in sequence, a data acquisition device, a controller, and an actuator.

[0064] The data acquisition device is used to acquire the humidity of the hydrogen gas being injected at the anode outlet of the stack and the current or power of the hydrogen circulation pump in the fuel cell in real time, and send them to the controller.

[0065] The controller is used to determine whether the humidity inside the fuel cell stack needs to be adjusted according to the humidity of the hydrogen gas being injected at the anode outlet of the stack at the current time; and if adjustment is needed, control the actuator to adjust the corresponding target control parameter at the next time of the current time to change the humidity inside the stack, and determine whether the humidity inside the stack reaches a balanced state according to the real-time change of the current or power of the hydrogen circulation pump during the adjustment process, and shut down after the balanced state is reached.

[0066] The actuator is used to adjust the humidity inside the stack according to the control of the controller.

[0067] During implementation, since the supply voltage of the hydrogen circulation pump is relatively stable, the real-time change of the current or power thereof can be used to determine whether the humidity inside the stack reaches a balanced state. Whether current or power is used depends on the type of the acquisition device and the type of the uploaded signal, and both have the same meaning.

[0068] Compared with the prior art, the humidity control device provided by the embodiment fully utilizes the relationship between the current of the circulating pump and the gas humidity in the current system, and controls the water balance of the fuel cell system steadily according to the change trend of the circulating pump current over time without introducing new hardware.

[0069] Embodiment 2

[0070] On the basis of embodiment 1, the humidity control device for the fuel cell further comprises an external data display control platform. The external data display control platform transmits data with the data acquisition device and the controller wirelessly.

[0071] The external data display control platform is used to acquire the humidity of the hydrogen gas injected at the anode outlet of the stack, the current or power of the hydrogen circulating pump, and the preset scheme currently adopted by the controller, store and display them, and send a humidity control start instruction to the controller.

[0072] Preferably, the data acquisition device further comprises a current and power measuring device and a humidity sensor.

[0073] The current and power measuring device is used to acquire the operating current and power of the hydrogen circulating pump in the fuel cell in real time and send them to the controller. Optionally, the current and power measuring device can adopt an ammeter connected in series with the hydrogen circulating pump, a voltmeter connected in parallel, or directly adopt a power meter, or adopt the data acquisition controller of the existing vehicle-mounted fuel cell system, which is generally arranged on the vehicle with the system, and the current and power can be further uploaded to the external data display control platform or a cloud server.

[0074] The humidity sensor is arranged at the anode inlet of the fuel cell stack and used to acquire the humidity of the hydrogen gas injected at the anode outlet of the stack in real time and send it to the controller.

[0075] Preferably, the actuator further comprises an exhaust valve control unit, a temperature control unit, and a gas supply control unit.

[0076] The exhaust valve control unit is used to control the opening and closing of the hydrogen exhaust valve connected with the stack in the fuel cell. Optionally, the exhaust valve control unit comprises an electromagnetic valve arranged at the front end of the hydrogen exhaust valve or electromagnetic valves arranged at the front and rear ends of the hydrogen exhaust valve. Specifically, in the fuel cell, the tail gas port of the stack is connected with the input ends of the water exhaust valve and the hydrogen exhaust valve through a water distributor, the output ends of the water exhaust valve and the hydrogen exhaust valve are connected with a mixed exhaust pipeline, and an electromagnetic valve is arranged at least between the water distributor and the hydrogen exhaust valve.

[0077] A temperature control unit is used to increase or decrease the temperature in the stack by controlling the rotation speed of the cooling fan in the fuel cell. The temperature control unit includes a variable resistor or a reactor. The rotation speed of the cooling fan depends on the input current size, and the rotation speed of the cooling fan can be adjusted by the variable resistor.

[0078] A gas supply control unit is used to increase or decrease the gas supply ratio of the stack by controlling the rotation speed of the air compressor and the opening degree of the throttle valve in the fuel cell. The rotation speed of the air compressor can be adjusted by connecting a variable resistor or a reactor in series at the input end of the air compressor, and the adjustment of the opening degree of the throttle valve is described in patent CN201810694172.1.

[0079] Preferably, the controller further comprises a data transceiver module, an analysis control module, and a balance monitoring module. The input end of the data transceiver module is connected to the output end of the current power measurement device and the humidity sensor, respectively, the output end one is connected to the input end one of the analysis control module, and the output end two is connected to the input end of the balance monitoring module. The output end of the analysis control module is connected to the start control end of the balance monitoring module.

[0080] The data transceiver module is used to receive the humidity of the injected hydrogen at the anode outlet of the stack and the current or power of the hydrogen circulation pump in the fuel cell, and send the humidity to the analysis control module and the current or power to the balance monitoring module according to the request of the balance monitoring module.

[0081] The analysis control module is used to compare the humidity of the injected hydrogen at the anode outlet of the stack at the current time with the preset threshold value to determine whether the humidity inside the fuel cell stack needs to be adjusted, and if so, start the balance monitoring module and control the actuator to adjust the corresponding target control parameter according to the preset scheme at the next time of the current time until receiving the balance instruction from the balance monitoring module and issuing a shutdown instruction to the actuator. The target control parameter includes at least one of the temperature in the stack, the gas supply ratio, and the exhaust valve opening time ratio.

[0082] The balance monitoring module is used to send a request to the data transceiver module to obtain the current or power after being started, compare the current or power change rate of the hydrogen circulation pump in the preset time period from the current time with the preset threshold value to determine whether the humidity inside the stack reaches the balance state, and immediately send a balance instruction to the analysis control module once the balance state is reached. Optionally, the change rate can be the average slope in a fixed time interval.

[0083] Preferably, the analysis control module executes the following program:

[0084] S21. Obtain the humidity a of the injected hydrogen at the anode outlet of the stack at the current time;

[0085] S22. Compare the humidity a with a preset threshold A to determine whether the humidity inside the fuel cell stack needs to be adjusted; when a = A, no adjustment is needed, otherwise, start the balance monitoring module and execute step S23 or step S24;

[0086] S23. When a > A, it is determined that the stack is wet, and the control execution structure executes the following scheme: increase the air compressor speed and the throttle opening degree to increase the air supply ratio; or, increase the response of the cooling fan to increase the stack temperature; or, shorten the exhaust valve opening gap length to increase the hydrogen exhaust valve opening time ratio to improve the humidity inside the stack;

[0087] S24. When a < A, it is determined that the stack is dry, and the control execution structure executes the following scheme: reduce the air compressor speed and the throttle opening degree to reduce the air supply ratio; or, reduce the response of the cooling fan to reduce the stack temperature; or, increase the exhaust valve opening gap length to reduce the hydrogen exhaust valve opening time ratio to improve the humidity inside the stack.

[0088] Preferably, in step S23, when a > A, the analysis control module controls the execution structure to execute the following program:

[0089] S231. Execute scheme one: shorten the exhaust valve opening gap length to increase the hydrogen exhaust valve opening time ratio;

[0090] S232. If the balance instruction sent by the balance monitoring module is received within a preset period of time from the execution of scheme one, the execution mechanism is closed, otherwise, at the end of the preset period of time, the control execution mechanism executes scheme two: shortens the exhaust valve opening gap length, and increases the air compressor speed and the throttle opening degree;

[0091] S234. If the balance instruction sent by the balance monitoring module is received within a preset period of time from the execution of scheme two, the execution mechanism is closed, otherwise, at the end of the preset period of time, the control execution mechanism executes scheme three until the balance instruction is received: shortens the exhaust valve opening gap length, increases the air compressor speed and the throttle opening degree, and increases the speed of the cooling fan;

[0092] Preferably, in step S24, when a < A, the analysis control module controls the execution structure to execute the following program:

[0093] S241. Execute scheme four: increase the exhaust valve opening gap length to reduce the hydrogen exhaust valve opening time ratio;

[0094] S242. If the balance instruction sent by the balance monitoring module is received within a preset period of time from the execution of scheme four, the execution structure is closed, otherwise, the control execution mechanism executes scheme five: increases the exhaust valve opening gap length, and reduces the air compressor speed and the throttle opening degree;

[0095] S243. If the balance instruction sent by the balance monitoring module is received within the preset time period since the implementation of scheme five, the execution mechanism is closed, otherwise, the execution mechanism is controlled to implement scheme six until the balance instruction is received: the opening gap length of the exhaust valve is increased, at the same time, the rotation speed of the air compressor and the opening degree of the throttle are reduced, and the rotation speed of the cooling fan is reduced.

[0096] Preferably, the balance monitoring module implements the following procedure:

[0097] S31. After starting, send a request to the data transceiver module to obtain the current or power;

[0098] S32. Receive the current or power of the hydrogen circulating pump within a preset time period from the current time, obtain the average slope of the current or power within the preset time period as the change rate b of the current or power;

[0099] S33. Compare the b with the preset threshold B, and determine whether the humidity inside the stack reaches a balanced state, if the change rate is equal to the preset threshold, it is determined that the balanced state is reached, and a balance instruction is immediately sent to the analysis control module, otherwise, it is determined that the balanced state is not reached, and the next time judgment is continued until the balanced state is determined.

[0100] Compared with embodiment 1, the device provided by the embodiment has the following advantages: the association with the humidity inside the fuel cell stack is established by using the hardware characteristics of the system itself, without introducing additional complex hardware to realize humidity monitoring; the time-sharing determination is performed by using the online data platform, and the non-real-time adjustment avoids the system working condition disorder and cannot converge; without complex technologies such as EIS, the device can adapt to different climates, intelligently adjust the fuel cell working condition, and improve the operation reliability and durability of the fuel cell.

[0101] Embodiment 3

[0102] The application also provides a humidity regulation method for a fuel cell corresponding to the devices of embodiments 1 and 2, comprising the following steps:

[0103] S1. Obtain the humidity of the hydrogen gas injected at the anode outlet of the stack at the current time; specifically,

[0104] S2. Determine whether the humidity inside the fuel cell stack needs to be adjusted according to the humidity; if adjustment is needed, the next step is performed, otherwise, the next cycle of judgment is entered;

[0105] S3. Control the execution mechanism to adjust the corresponding target control parameter at the next time of the current time to change the humidity inside the stack; the target control parameter includes at least one of the opening time ratio of the hydrogen exhaust valve, the gas supply metering ratio, the stack temperature, and the gas supply pressure;

[0106] S4. Obtain the current or power of the fuel cell heavy hydrogen circulating pump from the adjustment time, judge whether the internal humidity of the stack reaches the balance state according to the real-time change of the current or power, and end the control of the actuator after reaching the balance state.

[0107] Those skilled in the art can understand that all or part of the processes of the above-mentioned embodiments can be completed by instructing the relevant hardware by a computer program, and the program can be stored in a computer readable storage medium. The computer readable storage medium is a disk, an optical disk, a read-only memory or a random access memory, etc.

[0108] The above has described the embodiments of the present disclosure, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those skilled in the art without departing from the scope and spirit of the described embodiments. The selection of the terms used herein is intended to best explain the principles, practical application or improvement of the prior art of the embodiments, or to enable other ordinary skilled in the art to understand the embodiments disclosed herein.

Claims

1. A humidity conditioning device for a fuel cell, characterized by, The application comprises: a data acquisition device for acquiring the humidity of the hydrogen gas injected at the anode outlet of the fuel cell stack in real time and the current or power of the hydrogen circulation pump in the fuel cell, and sending the data to a controller; the controller for determining whether the humidity inside the fuel cell stack needs to be adjusted according to the humidity of the hydrogen gas injected at the anode outlet of the fuel cell stack at the current time, and if adjustment is needed, controlling the actuator to adjust the corresponding target control parameter at the next time point of the current time to change the humidity inside the fuel cell stack, and determining whether the humidity inside the fuel cell stack reaches a balanced state according to the real-time change of the current or power of the hydrogen circulation pump during the adjustment, and closing after the balanced state is reached; the actuator for adjusting the humidity inside the fuel cell stack according to the control of the controller; the data acquisition device further comprises: a current and power measuring device arranged at the input end of the hydrogen circulation pump in the fuel cell for acquiring the operating current and power of the hydrogen circulation pump in real time and sending the data to the controller; a humidity sensor arranged at the anode inlet of the fuel cell for acquiring the humidity of the hydrogen gas injected at the anode outlet of the fuel cell stack in real time and sending the data to the controller; the actuator comprises: an exhaust valve control unit for controlling the opening and closing of the hydrogen exhaust valve connected to the fuel cell stack in the fuel cell; a temperature control unit for increasing or decreasing the temperature inside the fuel cell stack by controlling the rotating speed of the cooling fan in the fuel cell; a gas supply control unit for increasing or decreasing the gas supply ratio of the fuel cell stack by controlling the rotating speed of the air compressor and the opening degree of the throttle valve in the fuel cell; the controller further comprises: a data transceiver module for receiving the humidity of the hydrogen gas injected at the anode outlet of the fuel cell stack and the current or power of the hydrogen circulation pump in the fuel cell, and sending the humidity to an analysis control module and sending the current or power to a balance monitoring module according to the request of the balance monitoring module; the analysis control module for comparing the humidity of the hydrogen gas injected at the anode outlet of the fuel cell stack at the current time with a preset threshold to determine whether the humidity inside the fuel cell stack needs to be adjusted, and if adjustment is needed, starting the balance monitoring module and controlling the actuator to adjust the corresponding target control parameter according to a preset scheme at the next time point of the current time until receiving the balance instruction from the balance monitoring module and issuing a closing instruction to the actuator; the target control parameter comprises at least one of the temperature inside the fuel cell stack, the gas supply ratio and the opening time ratio of the exhaust valve; the balance monitoring module for issuing a request to the data transceiver module to obtain the current or power after being started, comparing the current or power change rate of the hydrogen circulation pump in a preset time period from the current time with a preset threshold to determine whether the humidity inside the fuel cell stack reaches a balanced state, and issuing a balance instruction to the analysis control module as soon as the balanced state is reached; the analysis control module executes the following program: acquiring the humidity a of the hydrogen gas injected at the anode outlet of the fuel cell stack at the current time; comparing the humidity a with a preset threshold A to determine whether the humidity inside the fuel cell stack needs to be adjusted; when a = A, adjustment is not needed, otherwise, the balance monitoring module is started and the next step is executed. When a>A, it is determined that the stack is wet, and the control execution structure executes the following solutions: increasing the air compressor speed and the throttle opening, increasing the air supply ratio; or, increasing the response of the cooling fan, increasing the stack temperature; or, shortening the exhaust valve opening gap length, increasing the hydrogen exhaust valve opening time ratio to improve the stack humidity; When a When a>A, the analysis control module controls the execution structure to execute the following procedures: Solution one: shortening the exhaust valve opening gap length to increase the hydrogen exhaust valve opening time ratio; If the balance instruction is received from the balance monitoring module within a preset period of time from the execution of solution one, the execution mechanism is closed, otherwise, at the end of the preset period of time, the execution mechanism is controlled to execute solution two: shortening the exhaust valve opening gap length, and increasing the air compressor speed and the throttle opening; If the balance instruction is received from the balance monitoring module within a preset period of time from the execution of solution two, the execution mechanism is closed, otherwise, at the end of the preset period of time, the execution mechanism is controlled to execute solution three until the balance instruction is received: shortening the exhaust valve opening gap length, increasing the air compressor speed and the throttle opening, and increasing the speed of the cooling fan; When a Solution four: increasing the exhaust valve opening gap length to reduce the hydrogen exhaust valve opening time ratio; If the balance instruction is received from the balance monitoring module within a preset period of time from the execution of solution four, the execution mechanism is closed, otherwise, at the end of the preset period of time, the execution mechanism is controlled to execute solution five: increasing the exhaust valve opening gap length, and decreasing the air compressor speed and the throttle opening; If the balance instruction is received from the balance monitoring module within a preset period of time from the execution of solution five, the execution mechanism is closed, otherwise, at the end of the preset period of time, the execution mechanism is controlled to execute solution six until the balance instruction is received: increasing the exhaust valve opening gap length, decreasing the air compressor speed and the throttle opening, and decreasing the speed of the cooling fan; The balance monitoring module executes the following procedures: After starting, the data transceiver module is requested to obtain the current or power; The current or power of the hydrogen circulating pump within a preset period of time from the current time is received, and the average slope of the current or power within the preset period of time is obtained as the change rate b of the current or power; The b is compared with a preset threshold B to determine whether the stack internal humidity reaches a balanced state, if the change rate is equal to the preset threshold, it is determined that the balanced state is reached, and a balance instruction is immediately sent to the analysis control module, otherwise, it is determined that the balanced state is not reached, and the next time determination is continued until the balanced state is determined to be reached; Further comprising an external data display control platform; The external data display control platform is used for acquiring the humidity of the hydrogen gas injected at the anode outlet of the fuel cell stack, the current or power of the hydrogen circulation pump, and the preset scheme currently adopted by the controller, storing and displaying them; The method for regulating the humidity of a fuel cell comprises the following steps: Acquiring the humidity of the hydrogen gas injected at the anode outlet of the fuel cell stack at the current time; Judging whether the humidity inside the fuel cell stack needs to be adjusted according to the humidity; if so, the next step is executed, otherwise, the next cycle of judgment is entered; Controlling the adjusting of the corresponding target control parameter at the next time of the current time by an executing mechanism to change the humidity inside the fuel cell stack; the target control parameter comprises at least one of the opening time ratio of the hydrogen exhaust valve, the gas supply metering ratio, the fuel cell stack temperature, and the gas supply pressure; Acquiring the current or power of the fuel cell heavy hydrogen circulation pump from the adjusting time, judging whether the humidity inside the fuel cell stack reaches a balanced state according to the real-time change of the current or power, and ending the control of the executing mechanism after the balanced state is reached.

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