Humidity adjusting method and system of fuel cell system and fuel cell system

Abstract

The invention relates to the technical field of energy control, in particular to a humidity adjusting method and system of a fuel cell system and the fuel cell system. The wet side of the humidifying module of the fuel cell system is arranged between the cathode of the electric pile module and the energy recovery module, and a first regulating valve is arranged between the wet side of the humidifying module and the energy recovery module; the method comprises the following steps: acquiring current current, current impedance and a calibration impedance range corresponding to the current current of a galvanic pile module; judging the state of the electric pile module, and determining the dry and wet state of the electric pile module; based on the dry-wet state, the current current, the current impedance and a calibration impedance range corresponding to the current current, opening degree adjusting information of the first adjusting valve is determined; controlling a first regulating valve to operate so as to regulate the humidity in the galvanic pile module; the regulating valve is arranged between the wet side of the humidifying module and the energy recovery module, and the opening degree of the regulating valve is controlled, so that the size and the weight of the fuel cell system are reduced.

Description

Technical Field

[0001] The present application relates to the field of energy control technology, and in particular to a humidity regulation method and system for a fuel cell system, and a fuel cell system. Background Art

[0002] With the development of fuel cell technology, humidity control of fuel cells is one of the key factors to ensure the performance and life of fuel cells. In the prior art, a humidifier is usually used to externally humidify the air of the cathode stack, and the water and heat in the cathode stack are exchanged to the gas in the cathode stack through a membrane tube structure to ensure that the fuel cell stack operates under appropriate humidity conditions. However, in the prior art, humidification of the fuel cell system requires the use of a complex gas transmission circuit, which leads to a complex structure of the entire fuel cell system. Summary of the invention

[0003] In response to the above-mentioned problems in the prior art, the purpose of the present application is to set a regulating valve between the wet side of the humidification module and the energy recovery module to control the opening of the regulating valve, thereby achieving automatic adjustment of the humidity of the fuel cell system, reducing the volume of the fuel cell system and reducing the weight of the fuel cell system.

[0004] In order to solve the above problems, the present application provides a humidity regulation method for a fuel cell system, wherein the fuel cell system comprises a stack module, a humidification module and an energy recovery module, wherein the wet side of the humidification module is arranged between the cathode of the stack module and the energy recovery module, and a first regulating valve is arranged between the wet side of the humidification module and the energy recovery module;

[0005] The method comprises:

[0006] Obtaining a current current, a current impedance of the battery stack module, and a calibrated impedance range corresponding to the current current;

[0007] Judging the state of the battery stack module based on the current impedance and the calibrated impedance range corresponding to the current current, and determining the dry and wet state of the battery stack module;

[0008] Determining the opening adjustment information of the first regulating valve based on the dry and wet state, the current current, the current impedance, and a calibrated impedance range corresponding to the current current;

[0009] The first regulating valve is controlled to operate based on the opening adjustment information to adjust the humidity in the fuel cell stack module.

[0010] In an embodiment of the present application, the determining of the opening adjustment information of the first regulating valve based on the dry and wet state, the current current, the current impedance, and the calibrated impedance range corresponding to the current current includes:

[0011] When the dry-wet state indicates that the humidity value of the stack module is greater than or equal to the first target humidity, determining that the adjustment direction of the first regulating valve is a first direction; the first direction is a direction for increasing the opening of the first regulating valve;

[0012] Determine the increase in the opening value of the first regulating valve based on the current current, the current impedance, the calibrated impedance range corresponding to the current current, and a preset comparison relationship; the preset comparison relationship is a comparison relationship between a sample current, a sample impedance, the calibrated impedance range corresponding to the sample current, and the sample adjustment opening value;

[0013] The opening adjustment information is determined based on the first direction and the opening value increase amount.

[0014] In an embodiment of the present application, the determining of the opening adjustment information of the first regulating valve based on the dry and wet state, the current current, the current impedance, and the calibrated impedance range corresponding to the current current includes:

[0015] When the dry-wet state indicates that the humidity value of the stack module is less than or equal to a second target humidity, determining that the adjustment direction of the first regulating valve is a second direction; the second direction is a direction of reducing the opening of the first regulating valve; and the second target humidity is less than the first target humidity;

[0016] Determining a reduction amount of the opening value of the first regulating valve based on the current current, the current impedance, a calibrated impedance range corresponding to the current current, and the preset control relationship;

[0017] The opening adjustment information is determined based on the second direction and the opening value reduction amount.

[0018] In an embodiment of the present application, the battery stack module includes a plurality of battery cells, the two boundary values ​​of the calibrated impedance range are a first boundary value and a second boundary value, and the first boundary value is less than the second boundary value; the state of the battery stack module is judged based on the calibrated impedance range corresponding to the current impedance and the current current, and the dry and wet state of the battery stack module is determined, including:

[0019] Obtaining a voltage range difference; the voltage range difference is a difference between a maximum voltage and a minimum voltage among the plurality of battery cells;

[0020] When the current impedance is less than the first boundary value and the voltage extreme difference is greater than or equal to the preset extreme difference value, the dry and wet state of the battery stack module is determined to be the first target state; the first target state indicates that the humidity value of the battery stack module is greater than or equal to the first target humidity.

[0021] In the embodiment of the present application, the state judgment of the battery stack module based on the current impedance and the calibrated impedance range corresponding to the current current to determine the dry and wet state of the battery stack module includes:

[0022] When the current impedance is greater than the second boundary value, obtaining an average voltage difference and a standard voltage difference of the battery stack module; the average voltage difference represents a difference between an average voltage of the plurality of battery cells and a standard voltage;

[0023] When the difference between the average voltage and the standard voltage is greater than a preset difference threshold, the dry and wet state of the battery stack module is determined to be a second target state; the second target state indicates that the humidity value of the battery stack module is less than or equal to the second target humidity.

[0024] In the embodiment of the present application, after controlling the operation of the first regulating valve based on the opening adjustment information, the humidity adjustment method further includes:

[0025] When the current impedance value is within the calibrated impedance range corresponding to the current current, the first regulating valve is controlled to a target opening; the target opening is the opening of the first regulating valve under normal operating conditions of the battery stack module; the normal operating condition indicates that the humidity value of the battery stack module is between the first target humidity and the second target humidity.

[0026] In the embodiment of the present application, after controlling the operation of the first regulating valve based on the opening adjustment information, the humidity adjustment method further includes:

[0027] Get the current time node;

[0028] When the duration from the adjustment time node to the current time node is greater than or equal to the preset duration, the first regulating valve is controlled to a target opening; the adjustment time node is a time node for controlling the operation of the first regulating valve based on the opening adjustment information; the target opening is the opening of the first regulating valve under normal operating conditions of the battery stack module; the normal operating state indicates that the humidity value of the battery stack module is between the first target humidity and the second target humidity.

[0029] In an embodiment of the present application, a second regulating valve is provided between the wet side of the humidification module and the cathode of the stack module, and the humidity regulating method further includes:

[0030] The opening of the second regulating valve is controlled based on the opening adjustment information of the first regulating valve to adjust the internal and external air pressure difference of the fuel cell module.

[0031] On the other hand, the present application also provides a humidity control system for a fuel cell system, the control system comprising:

[0032] An information acquisition module, used to acquire the current current and current impedance of the battery stack module and a calibrated impedance range corresponding to the current current;

[0033] A battery stack state determination module, used to determine the state of the battery stack module based on the current impedance and the calibrated impedance range corresponding to the current current, and determine the dry and wet state of the battery stack module;

[0034] an adjustment information determination module, configured to determine the opening adjustment information of the first regulating valve based on the dry and wet state, the current current, the current impedance, and a calibrated impedance range corresponding to the current current;

[0035] A humidity regulating module is used to control the operation of the first regulating valve based on the opening adjustment information to adjust the humidity in the fuel cell stack module.

[0036] On the other hand, the present application also provides a fuel cell system, which includes a fuel cell stack module, a humidification module and an energy recovery module, the wet side of the humidification module is arranged between the cathode of the fuel cell stack module and the energy recovery module, and a first regulating valve is provided between the wet side of the humidification module and the energy recovery module, the humidification module is used to adjust the humidity of the fuel cell stack module, and the energy recovery module is used to convert gas flow into energy; the fuel cell system is applied to the humidity adjustment method of the fuel cell system provided in the embodiment of the present application.

[0037] On the other hand, the present application also provides an electronic device, comprising a processor and a memory, wherein the memory stores at least one instruction or at least one program, and the at least one instruction or the at least one program is loaded and executed by the processor to implement the humidity control method of the fuel cell system as described above.

[0038] On the other hand, the present application also provides a computer storage medium, which stores at least one instruction or at least one program, and the at least one instruction or the at least one program is loaded and executed by a processor to implement the humidity control method of the fuel cell system as described above.

[0039] Due to the above technical solution, the humidity adjustment method of a fuel cell system described in this application has the following advantages:

[0040] Beneficial effects:

[0041] By setting a first regulating valve between the wet side of the humidification module and the energy recovery module, and judging the wet and dry state of the stack module based on the current current, the current impedance and the calibrated impedance range corresponding to the current current, and automatically adjusting the opening of the first regulating valve based on the wet and dry state, the current current, the current impedance and the calibrated impedance corresponding to the current current, that is, by setting the first regulating valve and automatically adjusting the opening of the first regulating valve, there is no need for complex humidity adjustment pipeline settings, thereby reducing the volume of the fuel cell system and reducing the weight of the fuel cell system; in addition, by determining the opening of the first regulating valve to change the air flow on the cathode side of the stack module, adjusting the wet side pressure of the humidifier, and then adjusting the humidification capacity of the humidifier, the humidity of the stack module can be automatically adjusted, the complexity of humidity adjustment of the fuel cell system can be reduced, and the convenience of humidity adjustment of the fuel cell system can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings required for use in the embodiments or prior art descriptions. Obviously, the drawings described below are only some embodiments of the present application, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0043] Figure 1 is a schematic diagram of a partial structure of a fuel cell system provided in an embodiment of the present application;

[0044] Figure 2 is a schematic flow chart of a humidity adjustment method for a fuel cell system provided in an embodiment of the present application;

[0045] Figure 3 It is a schematic diagram of a flow chart of determining the opening adjustment information in the humidity adjustment method provided in an embodiment of the present application;

[0046] Figure 4 It is a schematic diagram of a flow chart of determining the opening adjustment information in the humidity adjustment method provided in an embodiment of the present application;

[0047] Figure 5 It is a reference schematic diagram of a preset comparison relationship in the humidity adjustment method provided in an embodiment of the present application;

[0048] Figure 6 is a structural schematic diagram of a humidity control system of a fuel cell system provided in an embodiment of the present application;

[0049] Figure 7 It is a hardware structure block diagram corresponding to the humidity adjustment method of the fuel cell system provided in the embodiment of the present application. DETAILED DESCRIPTION

[0050] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0051] The term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present application. In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "top", "bottom", etc. is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present application. In addition, the terms "first" and "second" are used only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may include one or more of the features explicitly or implicitly. Moreover, the terms "first", "second", etc. are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described here can be implemented in an order other than those illustrated or described here.

[0052] Combination Figure 1 , introducing a structural schematic diagram of a fuel cell system provided in an embodiment of the present application, the fuel cell system includes a stack module, a humidification module and an energy recovery module, the wet side of the humidification module is arranged between the cathode of the stack module and the energy recovery module, and a first regulating valve is provided between the wet side of the humidification module and the energy recovery module.

[0053] In the embodiment of the present application, the battery stack module includes a plurality of battery cells.

[0054] In a specific embodiment of the present application, the humidification module is used to adjust the humidity of the fuel cell module; the energy recovery module is used to convert the gas flow into energy.

[0055] In a specific embodiment of the present application, a membrane tube structure is provided between the wet side and the dry side of the humidification module to achieve moisture exchange.

[0056] In a specific embodiment of the present application, the energy recovery module is a turbine.

[0057] In a specific embodiment of the present application, the fuel cell system also includes a gas transmission module, the dry side of the humidification module is arranged between the cathode of the stack module and the gas transmission module, and an intercooler is provided between the gas transmission module and the humidification module.

[0058] In a specific embodiment of the present application, the gas delivery module is used to deliver gas to the fuel cell stack module; the intercooler is used to improve the gas delivery efficiency.

[0059] In a specific embodiment of the present application, the gas transmission module is an air compressor or a gas compressor.

[0060] In a specific embodiment of the present application, the fuel cell system further includes a driving module, which is drivingly connected to the gas transmission module to drive the gas transmission module to operate; specifically, the driving module is a driving motor M.

[0061] In a specific embodiment of the present application, the energy recovery module is connected to the driving module, and the energy recovery module is used to convert the gas flow into energy and then feed it back to the driving module.

[0062] In a specific embodiment of the present application, an air filter device is provided before the air enters the air compressor, and the air filter device is used to filter particulate matter in the gas to improve the quality of air entering the fuel cell system.

[0063] In the embodiment of the present application, a second regulating valve is provided between the wet side of the humidification module and the cathode of the stack module.

[0064] In an embodiment of the present application, the fuel cell system further includes a current sampling module and an impedance sampling module. Specifically, the current sampling module is used to sample the current of the fuel cell stack module, and the impedance sampling module is used to sample the impedance of the fuel cell stack module.

[0065] Combination Figure 2 , introduces a humidity adjustment method for a fuel cell system provided in an embodiment of the present application, the method comprising:

[0066] S1001. Obtain the current current, current impedance, and calibrated impedance range corresponding to the current current of the battery stack module.

[0067] In a specific embodiment of the present application, the current current refers to the current value corresponding to the current time node, the current impedance refers to the impedance value corresponding to the current time node, and different currents correspond to different calibrated impedance ranges.

[0068] S1002, judging the state of the battery stack module based on the current impedance and the calibrated impedance range corresponding to the current current, and determining the dry or wet state of the battery stack module; state judgment refers to the process of judging the dry or wet state of the battery stack module.

[0069] In a specific embodiment of the present application, the wet and dry states of the battery stack module include an over-humid state, a normal state and an over-dry state. Specifically, the over-humid state indicates that the humidity value of the battery stack module is greater than or equal to a first target humidity; the over-dry state indicates that the humidity value of the battery stack module is less than or equal to a second target humidity, and the second target humidity is less than the first target humidity; the normal state indicates that the humidity value of the battery stack module is between the first target humidity and the second target humidity.

[0070] S1003. Determine the opening adjustment information of the first regulating valve based on the dry and wet states, the current current, the current impedance, and the calibrated impedance range corresponding to the current current; the opening adjustment information includes an adjustment direction and an adjustment value. Specifically, the adjustment direction includes the direction in which the first regulating valve increases or decreases the opening; the adjustment value refers to the change value of the adjustment opening of the first regulating valve.

[0071] S1004. Control the operation of the first regulating valve based on the opening adjustment information to adjust the humidity in the fuel cell stack module.

[0072] In an embodiment of the present application, a first regulating valve is set between the wet side of the humidification module and the energy recovery module, and the wet and dry state of the stack module is judged based on the current current, the current impedance and the calibrated impedance range corresponding to the current current, and the opening of the first regulating valve is automatically adjusted based on the wet and dry state, the current current, the current impedance and the calibrated impedance corresponding to the current current. That is, by setting the first regulating valve and automatically adjusting the opening of the first regulating valve, there is no need for complex humidity adjustment pipeline settings, thereby reducing the volume of the fuel cell system and reducing the weight of the fuel cell system; in addition, by determining the opening of the first regulating valve to change the air flow on the cathode side of the stack module, adjusting the wet side pressure of the humidifier, and adjusting the humidification capacity of the humidifier, the humidity of the stack module can be automatically adjusted, thereby reducing the complexity of humidity regulation of the fuel cell system and improving the convenience of humidity regulation of the fuel cell system.

[0073] In a specific embodiment of the present application, the humidity adjustment method described above realizes closed-loop control of the humidity of the fuel cell system, thereby improving the performance and life of the fuel cell.

[0074] In a specific embodiment of the present application, the humidity adjustment method only needs to control the first regulating valve, which reduces the complexity of the control logic, thereby improving the fault tolerance of the humidity adjustment method and the accuracy of the fuel cell humidity adjustment.

[0075] refer to Figure 3 In the embodiment of the present application, the two boundary values ​​of the calibrated impedance range are a first boundary value and a second boundary value, the first boundary value is less than the second boundary value, and S1003 includes:

[0076] S2001. When the humidity value of the stack module in the dry and wet states is greater than or equal to a first target humidity, determine that the adjustment direction of the first regulating valve is a first direction; the first direction is a direction of increasing the opening of the first regulating valve.

[0077] S2002. Determine the increase in the opening value of the first regulating valve based on the current current, the current impedance, the calibrated impedance range corresponding to the current current, and a preset comparison relationship; the preset comparison relationship is the comparison relationship between the sample current, the sample impedance, the calibrated impedance range corresponding to the sample current, and the sample adjustment opening value.

[0078] In the specific embodiment of the present application, the following formula can be used to express the comparison relationship of the increase in the opening value:

[0079] Δφ1=f(I,R-R_SetLow)

[0080] Among them, Δφ1 is the increase in the opening value, f is a function, I is the current current, R is the current impedance, and R_SetLow is the first boundary value in the calibrated impedance range.

[0081] In a specific embodiment of the present application, the greater the difference between the current impedance and the first boundary value, the greater the increase in the opening value.

[0082] S2003. Determine opening adjustment information based on the first direction and the increase amount of the opening value.

[0083] In the embodiment of the present application, the humidity value of the fuel cell stack module is greater than or equal to the first target humidity, indicating that the fuel cell stack module is in an over-humidified state. At this time, it is necessary to reduce the humidity in the fuel cell stack module, and then increase the opening of the first regulating valve to reduce the pressure on the wet side of the humidifier, reduce the moisture transferred from the wet side of the humidifier to the dry side, and then reduce the humidity of the fuel cell stack module, so as to achieve automatic adjustment of the humidity of the fuel cell stack module, thereby reducing the complexity of humidity regulation of the fuel cell system and improving the convenience of humidity regulation of the fuel cell system.

[0084] refer to Figure 4 In the embodiment of the present application, S1003 further includes:

[0085] S3001. When the humidity value of the stack module in the dry and wet states is less than or equal to the second target humidity, determine that the adjustment direction of the first regulating valve is the second direction; the second direction is the direction of reducing the opening of the first regulating valve; the second target humidity is less than the first target humidity.

[0086] S3002: Determine a decrease in the opening value of the first regulating valve based on the current current, the current impedance, the calibrated impedance range corresponding to the current current, and a preset comparison relationship.

[0087] In a specific embodiment of the present application, the following formula can be used to express the comparison relationship of the opening value reduction value:

[0088] Δφ=f(I,R-R_SetHigh,V_Diff)

[0089] Among them, Δφ2 is the reduction in the opening value, I is the current current, R is the current impedance, R_SetHigh is the first boundary value in the calibrated impedance range, and V_Diff is the average voltage difference, which represents the difference between the average voltage of multiple battery cells and the standard voltage.

[0090] S3003. Determine opening adjustment information based on the second direction and the opening value reduction amount.

[0091] In the embodiment of the present application, the humidity value of the fuel cell stack module is less than or equal to the second humidity, indicating that the fuel cell stack module is in an overdry state. At this time, it is necessary to increase the humidity in the fuel cell stack module, and then reduce the opening of the first regulating valve to increase the pressure on the wet side of the humidifier, thereby increasing the moisture transferred from the wet side of the humidifier to the dry side of the humidifier, thereby increasing the humidity of the fuel cell stack module, and realizing automatic adjustment of the humidity of the fuel cell stack module, thereby reducing the complexity of humidity regulation of the fuel cell system and improving the convenience of humidity regulation of the fuel cell system.

[0092] In the embodiment of the present application, S1002 includes:

[0093] S4001. Obtain a voltage range difference; the voltage range difference is a difference between a maximum voltage and a minimum voltage in a plurality of battery cells.

[0094] S4002. When the current impedance is less than the first boundary value and the voltage extreme difference is greater than or equal to the preset extreme difference value, determine that the dry and wet state of the battery stack module is a first target state; the first target state indicates that the humidity value of the battery stack module is greater than or equal to the first target humidity.

[0095] In a specific embodiment of the present application, the first target state is an over-humidity state.

[0096] In the embodiment of the present application, the dryness and wetness status of the battery stack is judged by setting a boundary value, thereby improving the accuracy of judging the dryness and wetness status of the battery stack, and further improving the accuracy of humidity regulation of the battery stack module.

[0097] In the specific embodiment of the present application, the preset comparison relationship can refer to the following table:

[0098] Table 1 Preset comparison relationship reference table

[0099]

[0100] For details, please refer to the mapping in Table 1. Figure 5 , assuming that the current is 200mA / cm 2, and R-R_SetLow is -15mΩ, the valve opening changes to an increase of 20; assuming that the current is 1400mA / cm 2 , and when R-R_SetHigh is 5mΩ, the valve opening changes to a decrease of 5.

[0101] In the embodiment of the present application, S1002 further includes:

[0102] S5001. When the current impedance is greater than the second boundary value, obtain the average voltage difference and the standard voltage difference of the battery stack module; the average voltage difference represents the difference between the average voltage of multiple battery cells and the standard voltage; the standard voltage difference is a preset voltage difference.

[0103] S5002. When the difference between the average voltage and the standard voltage is greater than a preset difference threshold, determine that the dry and wet state of the stack module is a second target state; the second target state indicates that the humidity value of the stack module is less than or equal to a second target humidity.

[0104] In a specific embodiment of the present application, the second target state is an over-dry state.

[0105] In an embodiment of the present application, the dryness and wetness status of the battery stack is determined by setting a boundary value and by the difference between the average voltage and the standard voltage, thereby improving the accuracy of determining the dryness and wetness status of the battery stack and improving the accuracy of humidity regulation of the battery stack module.

[0106] In the embodiment of the present application, after S1004, the humidity adjustment method further includes:

[0107] When the current impedance value is within the calibrated impedance range corresponding to the current current, the first regulating valve is controlled to the target opening; the target opening is the opening of the first regulating valve under the normal operating state of the battery stack module; the normal operating state represents that the humidity value of the battery stack module is between the first target humidity and the second target humidity.

[0108] In an embodiment of the present application, by adjusting the opening of the first regulating valve to the target opening when the current impedance value is within the calibrated impedance range, the humidity change of the battery stack module caused by the valve opening is avoided, thereby improving the reliability and consistency of the humidity adjustment method.

[0109] In a specific embodiment of the present application, the change value of the target opening is 0°.

[0110] In the embodiment of the present application, after S1004, the humidity adjustment method further includes:

[0111] S7001. Get the current time node.

[0112] S7002. When the time from the adjustment time node to the current time node is greater than or equal to the preset time node, the first regulating valve is controlled to a target opening; the adjustment time node is a time node for controlling the operation of the first regulating valve based on the opening adjustment information; the target opening is the opening of the first regulating valve under normal operating conditions of the fuel cell stack module; the normal operating condition indicates that the humidity value of the fuel cell stack module is between the first target humidity and the second target humidity.

[0113] In an embodiment of the present application, the duration from the adjustment time node to the current time node is the adjustment duration of the first regulating valve. By adjusting the opening of the first regulating valve to the target opening when the adjustment duration of the first regulating valve reaches the preset duration, the humidity change of the battery stack module caused by the valve opening is avoided, thereby improving the reliability and consistency of the humidity adjustment method.

[0114] In an embodiment of the present application, the humidity adjustment method further includes:

[0115] The opening of the second regulating valve is controlled based on the opening adjustment information of the first regulating valve to adjust the internal and external gas pressure difference of the fuel cell stack module.

[0116] In a specific embodiment of the present application, the opening of the second regulating valve can also be determined based on the opening information of the first regulating valve, the cathode stack gas pressure and the cathode stack gas flow, thereby adjusting the cathode stack gas pressure and the cathode stack gas flow.

[0117] In an embodiment of the present application, a second regulating valve is provided, and the opening of the second regulating valve changes with the opening of the first regulating valve to balance and maintain the internal and external air pressure difference of the fuel cell module, thereby improving the reliability of the fuel cell system and the reliability of the humidity control method.

[0118] In a specific embodiment of the present application, the opening change of the second regulating valve matches the opening change of the first regulating valve. Specifically, when the opening of the first regulating valve increases, the opening of the second regulating valve decreases; when the opening of the first regulating valve decreases, the opening of the second regulating valve increases.

[0119] The humidity adjustment method of the fuel cell system provided in the embodiment of the present application has the following beneficial effects:

[0120] By setting a first regulating valve between the wet side of the humidification module and the energy recovery module, and judging the wet and dry state of the stack module based on the current current, the current impedance and the calibrated impedance range corresponding to the current current, and automatically adjusting the opening of the first regulating valve based on the wet and dry state, the current current, the current impedance and the calibrated impedance corresponding to the current current, that is, by setting the first regulating valve and automatically adjusting the opening of the first regulating valve, there is no need for complex humidity adjustment piping settings, thereby reducing the volume of the fuel cell system and reducing the weight of the fuel cell system; in addition, by determining the opening of the first regulating valve to adjust the wet side pressure of the humidifier, the humidification capacity of the humidifier is adjusted, thereby realizing automatic adjustment of the humidity of the stack module, thereby reducing the complexity of humidity adjustment of the fuel cell system and improving the convenience of humidity adjustment of the fuel cell system.

[0121] refer to Figure 6 The present application also provides a humidity control system for a fuel cell system, the system comprising:

[0122] The information acquisition module 101 is used to obtain the current current, current impedance and the calibrated impedance range corresponding to the current current of the battery stack module.

[0123] A stack state determination module 102 is used to determine the state of the stack module based on the current impedance and the calibrated impedance range corresponding to the current current, and determine the dry and wet state of the stack module;

[0124] The adjustment information determination module 103 is used to determine the opening adjustment information of the first regulating valve based on the dry and wet state, the current current, the current impedance and the calibrated impedance range corresponding to the current current;

[0125] The humidity regulating module 104 is used to control the operation of the first regulating valve based on the opening adjustment information to adjust the humidity in the fuel cell stack module.

[0126] The adjustment information determination module includes:

[0127] The first direction determining unit is used to determine that the adjustment direction of the first regulating valve is a first direction when the humidity value of the stack module in the dry and wet states is greater than or equal to the first target humidity; the first direction is a direction for increasing the opening of the first regulating valve.

[0128] The opening increment determination unit is used to determine the opening value increase of the first regulating valve based on the current current, the current impedance, the calibrated impedance range corresponding to the current current and the preset comparison relationship; the preset comparison relationship is the comparison relationship between the sample current, the sample impedance, the calibrated impedance range corresponding to the sample current and the sample adjustment opening value.

[0129] The first information determining unit is used to determine the opening adjustment information based on the first direction and the opening value increase amount.

[0130] The second direction determination unit is used to determine that the adjustment direction of the first regulating valve is the second direction when the humidity value of the battery stack module in the dry and wet states is less than or equal to the second target humidity; the second direction is the direction of reducing the opening of the first regulating valve; the second target humidity is lower than the first target humidity.

[0131] The opening reduction determination unit is used to determine the opening value reduction amount of the first regulating valve based on the current current, the current impedance, the calibrated impedance range corresponding to the current current and the preset comparison relationship.

[0132] The second information determining unit is used to determine the opening adjustment information based on the second direction and the opening value reduction amount.

[0133] The stack state determination module includes:

[0134] The voltage range acquisition unit is used to acquire the voltage range; the voltage range is the difference between the maximum voltage and the minimum voltage in the multiple battery cells.

[0135] The first state determination unit is used to determine that the dry and wet state of the battery stack module is a first target state when the current impedance is less than the first boundary value and the voltage extreme difference is greater than or equal to the preset extreme difference value; the first target state indicates that the humidity value of the battery stack module is greater than or equal to the first target humidity.

[0136] The voltage difference acquisition unit is used to acquire the average voltage difference and the standard voltage difference of the battery stack module when the current impedance is greater than the second boundary value; the average voltage difference represents the difference between the average voltage of multiple battery cells and the standard voltage.

[0137] The second state determination unit is used to determine that the dry and wet state of the battery stack module is a second target state when the difference between the average voltage and the standard voltage is greater than a preset difference threshold; the second target state indicates that the humidity value of the battery stack module is less than or equal to the second target humidity.

[0138] The humidity control system also includes:

[0139] The first reset module is used to control the first regulating valve to a target opening when the current impedance value is within the calibrated impedance range corresponding to the current current; the target opening is the opening of the first regulating valve under the normal operating state of the battery stack module; the normal operating state indicates that the humidity value of the battery stack module is between the first target humidity and the second target humidity.

[0140] The time acquisition module is used to obtain the current time node.

[0141] The second reset module is used to control the first regulating valve to a target opening when the time from the adjustment time node to the current time node is greater than or equal to a preset time; the adjustment time node is a time node for controlling the operation of the first regulating valve based on the opening adjustment information; the target opening is the opening of the first regulating valve under the normal operating state of the fuel cell module; the normal operating state represents that the humidity value of the fuel cell module is between the first target humidity and the second target humidity.

[0142] The second regulating valve control module is used to control the opening of the second regulating valve based on the opening adjustment information of the first regulating valve, so as to adjust the internal and external air pressure difference of the fuel cell stack module.

[0143] An embodiment of the present application also provides an electronic device, which includes a processor and a memory, wherein the memory stores at least one instruction or at least one program, and the at least one instruction or at least one program is loaded and executed by the processor to implement the humidity control method of the fuel cell system as described above.

[0144] The memory can be used to store software programs and modules. The processor executes various functional applications and data processing by running the software programs and modules stored in the memory. The memory can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, application programs required for functions, etc.; the data storage area can store data created according to the use of the device, etc. In addition, the memory can include a high-speed random access memory and can also include a non-volatile memory, such as at least one hard disk storage device, a flash memory device or other volatile solid-state storage device. Accordingly, the memory can also include a memory controller to provide the processor with access to the memory.

[0145] The method embodiments provided in the embodiments of the present application can be executed in electronic devices such as mobile terminals, computer terminals, servers or similar computing devices. Figure 7 is an electronic device provided in an embodiment of the present application. Figure 7As shown, the electronic device 900 may have relatively large differences due to different configurations or performances, and may include one or more central processing units (CPU) 910 (the processor 910 may include but is not limited to a processing device such as a microprocessor MCU or a programmable logic device FPGA), a memory 930 for storing data, and one or more storage media 920 (such as one or more mass storage devices) for storing application programs 923 or data 922. Among them, the memory 930 and the storage medium 920 can be short-term storage or permanent storage. The program stored in the storage medium 920 may include one or more modules, and each module may include a series of instruction operations in the electronic device. Furthermore, the central processing unit 910 can be configured to communicate with the storage medium 920 to execute a series of instruction operations in the storage medium 920 on the electronic device 900. The electronic device 900 may also include one or more power supplies 960, one or more wired or wireless network interfaces 950, one or more input and output interfaces 940, and / or one or more operating systems 921, such as Windows ServerTM, Mac OS XTM, UnixTM, LinuxTM, FreeBSDTM, etc.

[0146] The input / output interface 940 may be used to receive or send data via a network. The specific example of the network may include a wireless network provided by a communication provider of the electronic device 900. In one example, the input / output interface 940 includes a network adapter (NIC), which may be connected to other network devices via a base station so as to communicate with the Internet. In one example, the input / output interface 940 may be a radio frequency (RF) module, which is used to communicate with the Internet wirelessly.

[0147] It can be understood by those skilled in the art that Figure 7 The structure shown is only for illustration and does not limit the structure of the above electronic device. Figure 7 More or fewer components as shown, or with Figure 7 Different configurations shown.

[0148] An embodiment of the present application also provides a storage medium, in which at least one instruction or at least one program is stored, and the at least one instruction or at least one program is loaded and executed by a processor to implement the humidity regulation method of the fuel cell system as described above.

[0149] The above description has fully disclosed the specific implementation methods of the present application. It should be pointed out that any changes made by technicians familiar with the field to the specific implementation methods of the present application do not deviate from the scope of the claims of the present application. Accordingly, the scope of the claims of the present application is not limited to the above specific implementation methods.

Claims

1. A method for regulating humidity in a fuel cell system, characterized in that: The fuel cell system comprises a stack module, a humidification module and an energy recovery module, the wet side of the humidification module is arranged between the cathode of the stack module and the energy recovery module, and a first regulating valve is arranged between the wet side of the humidification module and the energy recovery module; The method comprises: Obtaining a current current, a current impedance of the battery stack module, and a calibrated impedance range corresponding to the current current; Judging the state of the battery stack module based on the current impedance and the calibrated impedance range corresponding to the current current, and determining the dry and wet state of the battery stack module; Determining the opening adjustment information of the first regulating valve based on the dry and wet state, the current current, the current impedance, and a calibrated impedance range corresponding to the current current; The first regulating valve is controlled to operate based on the opening adjustment information to adjust the humidity in the fuel cell stack module.

2. The humidity adjustment method of the fuel cell system according to claim 1, characterized in that: The determining of the opening adjustment information of the first regulating valve based on the dry and wet state, the current current, the current impedance and the calibrated impedance range corresponding to the current current includes: When the dry-wet state indicates that the humidity value of the stack module is greater than or equal to the first target humidity, determining that the adjustment direction of the first regulating valve is a first direction; the first direction is a direction for increasing the opening of the first regulating valve; Determine the increase in the opening value of the first regulating valve based on the current current, the current impedance, the calibrated impedance range corresponding to the current current, and a preset comparison relationship; the preset comparison relationship is a comparison relationship between a sample current, a sample impedance, the calibrated impedance range corresponding to the sample current, and the sample adjustment opening value; The opening adjustment information is determined based on the first direction and the opening value increase amount.

3. The humidity adjustment method of the fuel cell system according to claim 2, characterized in that: The determining of the opening adjustment information of the first regulating valve based on the dry and wet state, the current current, the current impedance and the calibrated impedance range corresponding to the current current includes: When the dry-wet state indicates that the humidity value of the stack module is less than or equal to a second target humidity, determining that the adjustment direction of the first regulating valve is a second direction; the second direction is a direction of reducing the opening of the first regulating valve; and the second target humidity is less than the first target humidity; Determining a reduction amount of the opening value of the first regulating valve based on the current current, the current impedance, a calibrated impedance range corresponding to the current current, and the preset control relationship; The opening adjustment information is determined based on the second direction and the opening value reduction amount.

4. The humidity adjustment method of the fuel cell system according to claim 2, characterized in that: The battery stack module includes a plurality of battery cells, the two boundary values ​​of the calibrated impedance range are a first boundary value and a second boundary value, and the first boundary value is smaller than the second boundary value; the state of the battery stack module is judged based on the current impedance and the calibrated impedance range corresponding to the current current, and the dry and wet state of the battery stack module is determined, including: Obtaining a voltage range difference; the voltage range difference is a difference between a maximum voltage and a minimum voltage among the plurality of battery cells; When the current impedance is less than the first boundary value and the voltage extreme difference is greater than or equal to the preset extreme difference value, the dry and wet state of the battery stack module is determined to be the first target state; the first target state indicates that the humidity value of the battery stack module is greater than or equal to the first target humidity.

5. The humidity adjustment method of the fuel cell system according to claim 3, characterized in that: The judging the state of the stack module based on the current impedance and the calibrated impedance range corresponding to the current current to determine the dry and wet state of the stack module includes: When the current impedance is greater than the second boundary value, obtaining an average voltage difference and a standard voltage difference of the battery stack module; the average voltage difference represents a difference between an average voltage of the plurality of battery cells and a standard voltage; When the difference between the average voltage and the standard voltage is greater than a preset difference threshold, the dry and wet state of the battery stack module is determined to be a second target state; the second target state indicates that the humidity value of the battery stack module is less than or equal to the second target humidity.

6. The humidity adjustment method of a fuel cell system according to claim 3, characterized in that: After controlling the operation of the first regulating valve based on the opening adjustment information, the method further includes: When the current impedance value is within the calibrated impedance range corresponding to the current current, the first regulating valve is controlled to a target opening; the target opening is the opening of the first regulating valve under normal operating conditions of the battery stack module; the normal operating condition indicates that the humidity value of the battery stack module is between the first target humidity and the second target humidity.

7. The humidity adjustment method of a fuel cell system according to claim 3, characterized in that: After controlling the operation of the first regulating valve based on the opening adjustment information, the method further includes: Get the current time node; When the duration from the adjustment time node to the current time node is greater than or equal to the preset duration, the first regulating valve is controlled to a target opening; the adjustment time node is a time node for controlling the operation of the first regulating valve based on the opening adjustment information; the target opening is the opening of the first regulating valve under normal operating conditions of the battery stack module; the normal operating state indicates that the humidity value of the battery stack module is between the first target humidity and the second target humidity.

8. The humidity adjustment method of a fuel cell system according to claim 1, characterized in that: A second regulating valve is provided between the wet side of the humidification module and the cathode of the stack module, and the method further comprises: The opening of the second regulating valve is controlled based on the opening adjustment information of the first regulating valve to adjust the internal and external air pressure difference of the fuel cell module.

9. A humidity control system for a fuel cell system, characterized in that: The fuel cell system comprises a stack module, a humidification module and an energy recovery module, the wet side of the humidification module is arranged between the cathode of the stack module and the energy recovery module, and a first regulating valve is arranged between the wet side of the humidification module and the energy recovery module; The system comprises: An information acquisition module, used to acquire the current current and current impedance of the battery stack module and a calibrated impedance range corresponding to the current current; A battery stack state determination module, used to determine the state of the battery stack module based on the current impedance and the calibrated impedance range corresponding to the current current, and determine the dry and wet state of the battery stack module; an adjustment information determination module, configured to determine the opening adjustment information of the first regulating valve based on the dry and wet state, the current current, the current impedance, and a calibrated impedance range corresponding to the current current; A humidity regulating module is used to control the operation of the first regulating valve based on the opening adjustment information to adjust the humidity in the fuel cell stack module.

10. A fuel cell system, characterized in that: The fuel cell system includes a stack module, a humidification module and an energy recovery module. The wet side of the humidification module is arranged between the cathode of the stack module and the energy recovery module. A first regulating valve is provided between the wet side of the humidification module and the energy recovery module. The humidification module is used to adjust the humidity of the stack module, and the energy recovery module is used to convert gas flow into energy. The fuel cell system is applied to the humidity control method of the fuel cell system as described in any one of claims 1 to 8.

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