Method, device and system for evaluating self-humidifying performance of fuel cell

Abstract

The invention relates to a method, a device and a system for evaluating the self-humidifying performance of a fuel cell. The method comprises the following steps: controlling a to-be-tested fuel cell to operate; controlling the steam-water separator to obtain gas output by the fuel cell at the gas outlet of the stack anode, and controlling the steam-water separator to perform gas-liquid separation treatment on the gas to obtain liquid water and saturated gas; acquiring an anode inlet parameter and an anode outlet parameter of the fuel cell to be tested; the anode outlet parameters comprise anode outlet humidity corresponding to gas and anode outlet liquid water weight corresponding to liquid water; determining inlet water content of the galvanic pile anode according to the anode inlet parameters; determining outlet liquid water quantity and outlet gaseous water quantity of the galvanic pile anode according to the anode outlet parameters; determining a purified water transfer coefficient by utilizing the water content, the outlet liquid water quantity and the outlet gaseous water quantity; and determining that the fuel cell has the self-humidifying performance under the condition that the purified water transfer coefficient is a negative value. According to the scheme, whether the fuel cell has the self-humidifying performance or not can be accurately judged.

Description

Technical Field

[0001] The present disclosure relates to the field of fuel cell technology, and in particular to a method, device and system for evaluating the self-humidification performance of a fuel cell. Background Art

[0002] In the related art, during the operation of the fuel cell, the generation and migration of water have a direct impact on the performance of the battery. Fuel cells produce water in electrochemical reactions, and this water needs to be effectively managed to maintain the proper wet state of the proton exchange membrane (PEM). Water generation mainly occurs at the cathode, while water migration involves factors such as electrical drag, pressure difference, humidity difference on both sides of the membrane, and temperature gradient. Proper water management can prevent "membrane drying" and "flooding". The former will cause the proton conductivity to decrease, and the latter will hinder the gas transmission to the catalyst layer, affecting the reaction. In order to improve the efficiency of the fuel cell system and reduce the system volume, passenger cars currently often use cathode non-humidification type proton exchange membrane fuel cell systems. Since there is no external humidification at the anode and cathode, the proton exchange membrane must rely on water molecules to realize the transfer of protons from the anode to the cathode when working. Therefore, a certain amount of water content must be guaranteed on the anode side to ensure the normal operation of the proton exchange membrane fuel cell. However, the traditional fuel cell water balance detection method can only determine whether flooding or membrane drying occurs in the stack, and cannot determine whether the fuel cell can achieve self-humidification. Summary of the invention

[0003] In order to overcome the problems existing in the related art, the present disclosure provides a method, device and system for evaluating the self-humidification performance of a fuel cell.

[0004] According to a first aspect of an embodiment of the present disclosure, a method for evaluating the self-humidification performance of a fuel cell is provided, comprising:

[0005] Controlling the fuel cell to be tested to operate under a first operating condition;

[0006] Controlling the steam-water separator to obtain the gas outputted from the gas outlet of the fuel cell stack anode, and controlling the steam-water separator to perform gas-liquid separation on the gas to obtain liquid water and saturated gas;

[0007] Acquiring anode inlet parameters and anode outlet parameters of the fuel cell to be tested; the anode outlet parameters include the outlet liquid water volume; the outlet liquid water volume is obtained by weighing the liquid water;

[0008] Determining the inlet water content of the stack anode according to the anode inlet parameter;

[0009] Determine the outlet liquid water volume and outlet gaseous water volume of the stack anode according to the anode outlet parameters;

[0010] Determining a net water transfer coefficient using the inlet water content, the outlet liquid water content, and the outlet gaseous water content;

[0011] When the net water transfer coefficient is a negative value, it is determined that the fuel cell has a self-humidification performance.

[0012] In some embodiments of the present disclosure, the anode inlet parameters include inlet relative humidity, inlet pressure, inlet temperature and inlet water density;

[0013] The step of determining the inlet water content of the anode of the stack according to the anode inlet parameter comprises:

[0014] The inlet water content of the stack anode is calculated by the following formula:

[0015] Inlet water content = inlet flow rate * inlet water mole fraction * inlet water density,

[0016] Inlet water mole fraction = inlet relative humidity * saturated water vapor pressure / inlet pressure,

[0017] Inlet water density = inlet pressure * water molar mass / (gas state constant * inlet temperature);

[0018] Wherein, the inlet saturated water vapor pressure is calculated based on the inlet temperature.

[0019] In some embodiments of the present disclosure, the anode outlet parameters include outlet liquid water volume, outlet pressure, outlet temperature, and current in the fuel cell operating state;

[0020] Determining the outlet gaseous water volume of the stack anode according to the anode outlet parameter includes:

[0021] The amount of gaseous water at the outlet of the stack anode is calculated by the following formula:

[0022] Water mole fraction at the outlet = 1* outlet saturated water vapor pressure / outlet pressure;

[0023] Water mass fraction at outlet = water mole fraction at outlet * water mole mass / (water mole fraction at outlet * water mole mass + (1-water mole fraction at outlet) * hydrogen mole mass));

[0024] The mass fraction of hydrogen at the outlet = 1-the mass fraction of water at the outlet;

[0025] Hydrogen mass flow rate at outlet = (stoichiometric ratio of reactants - 1) * current / (2 * Faraday constant);

[0026] Total mass flow rate at the outlet = hydrogen mass flow rate at the outlet / hydrogen mass fraction at the outlet;

[0027] The amount of gaseous water at the outlet = the total mass flow at the outlet * the mass fraction of water at the outlet;

[0028] Wherein, the outlet saturated water vapor pressure is calculated based on the outlet temperature.

[0029] In some embodiments of the present disclosure, the method of determining the net water transfer coefficient using the inlet water content, the outlet liquid water content, and the outlet gaseous water content includes:

[0030] The net water transfer coefficient is calculated by the following formula:

[0031] Water transfer coefficient = water volume passing through the anode and cathode membranes / water volume generated by electrochemical reaction

[0032] The amount of water permeating the anode and cathode membranes = outlet gaseous water volume + outlet liquid water volume - inlet gaseous water volume

[0033] The amount of water generated by electrochemical reaction = 0.018*current / (2*Faraday constant).

[0034] In some embodiments of the present disclosure, the method further includes:

[0035] The heating belt is controlled to perform heating treatment on the pipeline connected between the gas outlet of the anode of the stack and the steam-water separator.

[0036] In some embodiments of the present disclosure, the first operating condition is any one of a plurality of preset operating conditions.

[0037] According to a second aspect of an embodiment of the present disclosure, a fuel cell self-humidification performance evaluation device is provided, comprising:

[0038] An operating unit, used for controlling the fuel cell to be tested to operate under a first operating condition;

[0039] A gas-liquid separation unit, used to control the steam-water separator to obtain the gas outputted from the gas outlet of the fuel cell stack anode, and to control the steam-water separator to perform gas-liquid separation on the gas to obtain liquid water and saturated gas;

[0040] An acquisition unit, used for acquiring an anode inlet parameter and an anode outlet parameter of the fuel cell to be tested; the anode outlet parameter includes an outlet liquid water volume; the outlet liquid water volume is obtained by weighing the liquid water;

[0041] A first determining unit, configured to determine the inlet water content of the anode of the stack according to the anode inlet parameter;

[0042] A second determination unit, used to determine the outlet liquid water volume and the outlet gaseous water volume of the stack anode according to the anode outlet parameter;

[0043] A third determining unit is used to determine a net water transfer coefficient using the inlet water content, the outlet liquid water content and the outlet gaseous water content;

[0044] The fourth determining unit is used to determine that the fuel cell has a self-humidification performance when the net water transfer coefficient is a negative value.

[0045] According to a third aspect of an embodiment of the present disclosure, an electronic device includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the method described in any one of the first aspects is implemented.

[0046] According to a fourth aspect of an embodiment of the present disclosure, there is provided a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the method according to any one of the first aspects is implemented.

[0047] According to a fifth aspect of an embodiment of the present disclosure, a computer program product is provided, comprising a computer program, wherein the computer program implements the method as described in any one of the first aspects when executed by a processor.

[0048] The technical solution provided by the embodiment of the present disclosure may include the following beneficial effects: controlling the fuel cell to be tested to operate under the first working condition; controlling the steam-water separator to obtain the gas outputted by the fuel cell at the gas outlet of the anode of the stack, and controlling the steam-water separator to perform gas-liquid separation on the gas to obtain liquid water and saturated gas; obtaining the anode inlet parameters and anode outlet parameters of the fuel cell to be tested; the anode outlet parameters include the anode outlet humidity corresponding to the gas and the anode outlet liquid water weight corresponding to the liquid water; determining the inlet water content of the anode of the stack according to the anode inlet parameters; determining the outlet liquid water volume and outlet gaseous water volume of the anode of the stack according to the anode outlet parameters; determining the net water transfer coefficient using the water content, the outlet liquid water volume and the outlet gaseous water volume; determining the fuel cell with self-humidification performance when the net water transfer coefficient is negative. The net water transfer coefficient can be calculated by only using the steam-water separator, which realizes the lightweight of the test device. In addition, the water transfer amount and transfer direction during the operation of the fuel cell are quantified, so as to accurately judge whether the fuel cell has the performance of self-humidification.

[0049] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0051] Figure 1The figure is a flow chart of a method for evaluating the self-humidification performance of a fuel cell according to an exemplary embodiment.

[0052] Figure 2 The figure is a block diagram of a fuel cell self-humidification performance evaluation device according to an exemplary embodiment.

[0053] Figure 3 The invention is a block diagram showing a device for a method for evaluating the self-humidification performance of a fuel cell according to an exemplary embodiment. DETAILED DESCRIPTION

[0054] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Instead, they are merely examples of devices and methods consistent with some aspects of the present invention as detailed in the appended claims.

[0055] The terms used in the disclosed embodiments are only for the purpose of describing specific embodiments, and are not intended to limit the disclosed embodiments. The singular forms "a", "an" and "the" used in the disclosed embodiments and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0056] It should be understood that although the terms first, second, third, etc. may be used to describe various information in the disclosed embodiments, these information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the disclosed embodiments, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the words "if" and "if" as used herein may be interpreted as "at" or "when" or "in response to determination".

[0057] In addition, various forms of processes shown in the embodiments of the present disclosure may be used to reorder, add or delete steps. For example, the steps described in the present application may be performed in parallel, sequentially or in different orders, as long as the desired results of the technical solution disclosed in the present disclosure can be achieved, and this document does not limit this.

[0058] Among the related technologies, proton exchange membrane fuel cells are an important area of ​​hydrogen energy utilization and a hot topic in the new energy industry. Proton exchange membrane fuel cells have the characteristics of clean energy, only water as emission, and high conversion efficiency, so they are widely used in automobiles, ships, portable power supplies, household power supplies and other fields.

[0059] Fuel cell water and heat management is one of the key technologies to ensure the performance and life of the cell. Fuel cell water management is one of the key technologies to ensure the performance and life of the fuel cell. During the operation of the fuel cell, the generation and migration of water have a direct impact on the performance of the cell. Fuel cells produce water during electrochemical reactions, and this water needs to be effectively managed to maintain the proper wetness of the proton exchange membrane (PEM). Water generation mainly occurs at the cathode, while water migration involves factors such as electrical drag, pressure difference, humidity difference on both sides of the membrane, and temperature gradient. Proper water management can prevent "membrane drying" and "flooding". The former will cause a decrease in proton conductivity, and the latter will hinder the transmission of gas to the catalyst layer, affecting the reaction. In order to improve the efficiency of the fuel cell system and reduce the system size, passenger cars currently often use cathode non-humidification proton exchange membrane fuel cell systems. Since there is no external humidification at the anode and cathode, the proton exchange membrane must rely on water molecules to realize the transfer of protons from the anode to the cathode when working. Therefore, a certain water content must be maintained on the anode side to ensure the normal operation of the proton exchange membrane fuel cell. However, the traditional fuel cell water balance detection method can only determine whether water flooding or membrane drying occurs in the stack, and cannot determine whether the fuel cell can achieve self-humidification.

[0060] In order to solve the above problems, the present disclosure provides a method, device and system for evaluating the self-humidification performance of a fuel cell, which controls the fuel cell to be tested to operate under the first working condition; controls the steam-water separator to obtain the gas outputted by the fuel cell at the gas outlet of the anode of the stack, and controls the steam-water separator to perform gas-liquid separation on the gas to obtain liquid water and saturated gas; obtains the anode inlet parameter and anode outlet parameter of the fuel cell to be tested; the anode outlet parameter includes the anode outlet humidity corresponding to the gas and the anode outlet liquid water weight corresponding to the liquid water; determines the inlet water content of the anode of the stack according to the anode inlet parameter; determines the outlet liquid water amount and outlet gaseous water amount of the anode of the stack according to the anode outlet parameter; determines the net water transfer coefficient using the water content, the outlet liquid water amount and the outlet gaseous water amount; and determines that the fuel cell has self-humidification performance when the net water transfer coefficient is negative. The net water transfer coefficient can be calculated by only using the steam-water separator, which realizes the lightweight of the test device. In addition, the water transfer amount and transfer direction during the operation of the fuel cell are quantified, so as to accurately judge whether the fuel cell has the performance of self-humidification.

[0061] Figure 1 is a flow chart of a method for evaluating the self-humidification performance of a fuel cell according to an exemplary embodiment. Figure 1 As shown, it should be noted that the self-humidification performance evaluation method of a fuel cell in the embodiment of the present disclosure is applied to the self-humidification performance evaluation of a fuel cell. Figure 1 As shown, the method may include the following steps:

[0062] Step 101, controlling the fuel cell to be tested to operate under a first operating condition.

[0063] In some embodiments of the present disclosure, the first operating condition is any one of a plurality of preset operating conditions.

[0064] In addition, different operating conditions correspond to different inlet temperatures and / or inlet pressures.

[0065] In one embodiment, the fuel cell to be tested may be installed on a fuel cell test bench, the inlet temperature and inlet flow rate of the fuel cell may be preset, and the fuel cell to be tested may be controlled to operate under the first operating condition.

[0066] Step 102, controlling the steam-water separator to obtain the gas outputted from the gas outlet of the fuel cell stack anode, and controlling the steam-water separator to perform gas-liquid separation on the gas to obtain liquid water and saturated gas.

[0067] Step 103, obtaining anode inlet parameters and anode outlet parameters of the fuel cell to be tested.

[0068] Wherein, the anode outlet parameter includes the outlet liquid water volume; the outlet liquid water volume is obtained by weighing the liquid water.

[0069] It can be understood that by using a gas-water separator to perform gas-liquid separation on the gas output by the fuel cell at the anode of the stack, liquid water and saturated gas are obtained, the amount of liquid water at the outlet can be determined, and then the amount of water passing through the anode and cathode membranes can be calculated using the amount of liquid water at the outlet, thereby ultimately accurately calculating the net water transfer coefficient.

[0070] Step 104, determining the inlet water content of the stack anode according to the anode inlet parameters.

[0071] In some embodiments of the present disclosure, the anode inlet parameters include inlet relative humidity, inlet pressure, inlet temperature and inlet water density. Step 104 may specifically include:

[0072] The inlet water content of the stack anode is calculated by the following formula:

[0073] Inlet water content = inlet flow rate * inlet water mole fraction * inlet water density,

[0074] Inlet water mole fraction = inlet relative humidity * saturated water vapor pressure / inlet pressure,

[0075] Inlet water density = inlet pressure * water molar mass / (gas state constant * inlet temperature);

[0076] The inlet saturated water vapor pressure is calculated based on the inlet temperature.

[0077] Step 105, determining the outlet liquid water volume and outlet gaseous water volume of the stack anode according to the anode outlet parameters.

[0078] In some embodiments of the present disclosure, the anode outlet parameters include the outlet liquid water volume, outlet pressure, outlet temperature and the current under the fuel cell operation state; step 105 may specifically include the following steps:

[0079] The amount of gaseous water at the outlet of the stack anode is calculated by the following formula:

[0080] Water mole fraction at the outlet = 1* outlet saturated water vapor pressure / outlet pressure;

[0081] Water mass fraction at outlet = water mole fraction at outlet * water mole mass / (water mole fraction at outlet * water mole mass + (1-water mole fraction at outlet) * hydrogen mole mass));

[0082] The mass fraction of hydrogen at the outlet = 1-the mass fraction of water at the outlet;

[0083] Hydrogen mass flow rate at the outlet = (stoichiometric ratio of reactants - 1) * current / (2 * Faraday constant);

[0084] Total mass flow rate at the outlet = hydrogen mass flow rate at the outlet / hydrogen mass fraction at the outlet;

[0085] The amount of gaseous water at the outlet = the total mass flow at the outlet * the mass fraction of water at the outlet;

[0086] Among them, the outlet saturated water vapor pressure is calculated based on the outlet temperature.

[0087] Step 106, determining the net water transfer coefficient using the water content, the outlet liquid water volume and the outlet gaseous water volume.

[0088] In some embodiments of the present disclosure, step 106 may specifically include the following steps:

[0089] The net water transfer coefficient is calculated by the following formula:

[0090] Water transfer coefficient = water volume passing through the anode and cathode membranes / water volume generated by electrochemical reaction

[0091] The amount of water permeating the anode and cathode membranes = outlet gaseous water volume + outlet liquid water volume - inlet gaseous water volume

[0092] The amount of water generated by electrochemical reaction = 0.018*current / (2*Faraday constant).

[0093] Step 107: When the net water transfer coefficient is a negative value, it is determined that the fuel cell has a self-humidification performance.

[0094] It can be understood that the net water transfer coefficient represents the amount of water transferred from the anode to the cathode through the proton exchange membrane during the operation of the stack. When the value is positive, it means that the water is transferred from the anode to the cathode, and when the value is negative, it means that the water is transferred from the cathode to the anode. For self-humidifying stacks, the net water transfer coefficient needs to be kept in the negative range to ensure that the anode side always contains a certain amount of water to ensure the normal operation of the stack.

[0095] In some embodiments of the present disclosure, the heating tape may be controlled to perform heating treatment on the pipeline connected to the gas outlet of the anode of the stack and the steam-water separator.

[0096] It should be noted that the heat treatment is used to insulate the pipeline to prevent the gas at the outlet of the fuel cell from condensing during the transmission process and causing experimental errors.

[0097] According to the self-humidification performance evaluation method of the fuel cell proposed in the embodiment of the present disclosure, the fuel cell to be tested is controlled to operate under the first working condition; the gas outputted by the fuel cell at the gas outlet of the anode of the stack is controlled to obtain the gas, and the gas-water separator is controlled to perform gas-liquid separation on the gas to obtain liquid water and saturated gas; the anode inlet parameter and anode outlet parameter of the fuel cell to be tested are obtained; the anode outlet parameter includes the anode outlet humidity corresponding to the gas and the anode outlet liquid water weight corresponding to the liquid water; the inlet water content of the anode of the stack is determined according to the anode inlet parameter; the outlet liquid water amount and the outlet gaseous water amount of the anode of the stack are determined according to the anode outlet parameter; the net water transfer coefficient is determined by using the water content, the outlet liquid water amount and the outlet gaseous water amount; when the net water transfer coefficient is negative, it is determined that the fuel cell has self-humidification performance. The net water transfer coefficient can be calculated by only using the gas-water separator, which realizes the lightweight of the test device. In addition, the water transfer amount and transfer direction during the operation of the fuel cell are quantified, so as to accurately judge whether the fuel cell has the self-humidification performance.

[0098] Figure 2 FIG. 1 is a block diagram of a fuel cell self-humidification performance evaluation device according to an exemplary embodiment. Figure 2 The device includes an operation unit 201, a gas-liquid separation unit 202, an acquisition unit 203, a first determination unit 204, a second determination unit 205, a third determination unit 206 and a fourth determination unit 207.

[0099] The operation unit 201 is used to control the fuel cell to be tested to operate under the first working condition;

[0100] The gas-liquid separation unit 202 is used to control the steam-water separator to obtain the gas outputted from the gas outlet of the fuel cell stack anode, and to control the steam-water separator to perform gas-liquid separation on the gas to obtain liquid water and saturated gas;

[0101] The acquisition unit 203 is used to acquire the anode inlet parameter and the anode outlet parameter of the fuel cell to be tested; the anode outlet parameter includes the outlet liquid water volume; the outlet liquid water volume is obtained by weighing the liquid water;

[0102] A first determining unit 204 is used to determine the inlet water content of the anode of the stack according to the anode inlet parameter;

[0103] The second determination unit 205 is used to determine the outlet liquid water volume and outlet gaseous water volume of the stack anode according to the anode outlet parameters;

[0104] A third determining unit 206 is used to determine the net water transfer coefficient using the water content, the outlet liquid water volume and the outlet gaseous water volume;

[0105] The fourth determining unit 207 is used to determine whether the fuel cell has a self-humidification performance when the net water transfer coefficient is a negative value.

[0106] In some embodiments of the present disclosure, the anode inlet parameters include inlet relative humidity, inlet pressure, inlet temperature and inlet water density; the first determination unit 204 can be specifically used to:

[0107] The inlet water content of the stack anode is calculated by the following formula:

[0108] Inlet water content = inlet flow rate * inlet water mole fraction * inlet water density,

[0109] Inlet water mole fraction = inlet relative humidity * saturated water vapor pressure / inlet pressure,

[0110] Inlet water density = inlet pressure * water molar mass / (gas state constant * inlet temperature);

[0111] The inlet saturated water vapor pressure is calculated based on the inlet temperature.

[0112] In some embodiments of the present disclosure, the anode outlet parameters include the outlet liquid water volume, outlet pressure, outlet temperature and the current under the fuel cell operation state; the second determination unit 205 can be specifically used to:

[0113] The amount of gaseous water at the outlet of the stack anode is calculated by the following formula:

[0114] Water mole fraction at the outlet = 1* outlet saturated water vapor pressure / outlet pressure;

[0115] Water mass fraction at outlet = water mole fraction at outlet * water mole mass / (water mole fraction at outlet * water mole mass + (1-water mole fraction at outlet) * hydrogen mole mass));

[0116] The mass fraction of hydrogen at the outlet = 1-the mass fraction of water at the outlet;

[0117] Hydrogen mass flow rate at the outlet = (stoichiometric ratio of reactants - 1) * current / (2 * Faraday constant);

[0118] Total mass flow rate at the outlet = hydrogen mass flow rate at the outlet / hydrogen mass fraction at the outlet;

[0119] The amount of gaseous water at the outlet = the total mass flow at the outlet * the mass fraction of water at the outlet;

[0120] Among them, the outlet saturated water vapor pressure is calculated based on the outlet temperature.

[0121] In some embodiments of the present disclosure, the third determining unit 206 may be specifically configured to:

[0122] The net water transfer coefficient is calculated by the following formula:

[0123] Water transfer coefficient = water volume passing through the anode and cathode membranes / water volume generated by electrochemical reaction

[0124] The amount of water permeating the anode and cathode membranes = outlet gaseous water volume + outlet liquid water volume - inlet gaseous water volume

[0125] The amount of water generated by electrochemical reaction = 0.018*current / (2*Faraday constant).

[0126] In some embodiments of the present disclosure, the device may further include a heating unit for controlling the heating tape to perform heating treatment on the pipeline connected to the gas outlet of the anode of the stack and the steam-water separator.

[0127] In some embodiments of the present disclosure, the first operating condition is any one of a plurality of preset operating conditions.

[0128] Regarding the device in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be elaborated here.

[0129] According to the self-humidification performance evaluation device of the fuel cell proposed in the embodiment of the present disclosure, the fuel cell to be tested is controlled to operate under the first working condition; the gas outputted by the fuel cell at the gas outlet of the anode of the stack is controlled to obtain the gas, and the gas-water separator is controlled to perform gas-liquid separation on the gas to obtain liquid water and saturated gas; the anode inlet parameter and anode outlet parameter of the fuel cell to be tested are obtained; the anode outlet parameter includes the anode outlet humidity corresponding to the gas and the anode outlet liquid water weight corresponding to the liquid water; the inlet water content of the anode of the stack is determined according to the anode inlet parameter; the outlet liquid water amount and the outlet gaseous water amount of the anode of the stack are determined according to the anode outlet parameter; the net water transfer coefficient is determined by using the water content, the outlet liquid water amount and the outlet gaseous water amount; when the net water transfer coefficient is negative, it is determined that the fuel cell has self-humidification performance. The net water transfer coefficient can be calculated by only using the gas-water separator, which realizes the lightweight of the test device. In addition, the water transfer amount and transfer direction during the operation of the fuel cell are quantified, so as to accurately judge whether the fuel cell has the performance of self-humidification.

[0130] Figure 3 3 is a block diagram of a device for a method for evaluating the self-humidification performance of a fuel cell according to an exemplary embodiment. For example, the device 300 may be an electronic device, such as a mobile phone, a computer, a digital broadcast terminal, a messaging device, a game console, a tablet device, a medical device, a fitness device, a personal digital assistant, etc.

[0131] Reference Figure 3 , the device 300 may include one or more of the following components: a processing component 302 , a memory 304 , a power component 306 , a multimedia component 308 , an audio component 310 , an input / output (I / O) interface 312 , a sensor component 314 , and a communication component 316 .

[0132] The processing component 302 generally controls the overall operation of the device 300, such as operations associated with display, phone calls, data communications, camera operations, and recording operations. The processing component 302 may include one or more processors 320 to execute instructions to complete all or part of the steps of the above-mentioned method. In addition, the processing component 302 may include one or more modules to facilitate the interaction between the processing component 302 and other components. For example, the processing component 302 may include a multimedia module to facilitate the interaction between the multimedia component 308 and the processing component 302.

[0133] The memory 304 is configured to store various types of data to support operations on the device 300. Examples of such data include instructions for any application or method operating on the device 300, contact data, phone book data, messages, pictures, videos, etc. The memory 304 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disk or optical disk.

[0134] The power component 306 provides power to the various components of the device 300. The power component 306 may include a power management system, one or more power supplies, and other components associated with generating, managing, and distributing power for the device 300.

[0135] The multimedia component 308 includes a screen that provides an output interface between the device 300 and the user. In some embodiments, the screen may include a liquid crystal display (LCD) and a touch panel (TP). If the screen includes a touch panel, the screen may be implemented as a touch screen to receive input signals from the user. The touch panel includes one or more touch sensors to sense touch, slide, and gestures on the touch panel. The touch sensor may not only sense the boundaries of the touch or slide action, but also detect the duration and pressure associated with the touch or slide operation. In some embodiments, the multimedia component 308 includes a front camera and / or a rear camera. When the device 300 is in an operating mode, such as a shooting mode or a video mode, the front camera and / or the rear camera may receive external multimedia data. Each front camera and rear camera may be a fixed optical lens system or have a focal length and optical zoom capability.

[0136] The audio component 310 is configured to output and / or input audio signals. For example, the audio component 310 includes a microphone (MIC), and when the device 300 is in an operating mode, such as a call mode, a recording mode, and a speech recognition mode, the microphone is configured to receive an external audio signal. The received audio signal can be further stored in the memory 304 or sent via the communication component 316. In some embodiments, the audio component 310 also includes a speaker for outputting audio signals.

[0137] I / O interface 312 provides an interface between processing component 302 and peripheral interface modules, such as keyboards, click wheels, buttons, etc. These buttons may include but are not limited to: a home button, a volume button, a start button, and a lock button.

[0138] The sensor assembly 314 includes one or more sensors for providing various aspects of status assessment for the device 300. For example, the sensor assembly 314 can detect the open / closed state of the device 300, the relative positioning of components, such as the display and keypad of the device 300, the sensor assembly 314 can also detect the position change of the device 300 or a component of the device 300, the presence or absence of user contact with the device 300, the orientation or acceleration / deceleration of the device 300, and the temperature change of the device 300. The sensor assembly 314 may include a proximity sensor configured to detect the presence of nearby objects without any physical contact. The sensor assembly 314 may also include an optical sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor assembly 314 may also include an accelerometer, a gyroscope sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.

[0139] The communication component 316 is configured to facilitate wired or wireless communication between the device 300 and other devices. The device 300 can access a wireless network based on a communication standard, such as WiFi, 2G or 3G, or a combination thereof. In an exemplary embodiment, the communication component 316 receives a broadcast signal or broadcast-related information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, the communication component 316 also includes a near field communication (NFC) module to facilitate short-range communication. For example, the NFC module can be implemented based on radio frequency identification (RFID) technology, infrared data association (IrDA) technology, ultra-wideband (UWB) technology, Bluetooth (BT) technology and other technologies.

[0140] In an exemplary embodiment, the apparatus 300 may be implemented by one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors or other electronic components to perform the above method.

[0141] In an exemplary embodiment, a non-transitory computer-readable storage medium including instructions is also provided, such as a memory 304 including instructions, and the instructions can be executed by the processor 320 of the device 300 to perform the above method. For example, the non-transitory computer-readable storage medium can be a ROM, a random access memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, etc.

[0142] In an exemplary embodiment, a computer program product is also provided, comprising a computer program, which implements the above method when executed by the processor 320 of the device 300 .

[0143] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. The present disclosure is intended to cover any variations, uses or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The description and examples are to be considered exemplary only, and the true scope and spirit of the present invention are indicated by the following claims.

[0144] It should be understood that the present invention is not limited to the exact construction that has been described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A method for evaluating the self-humidification performance of a fuel cell, characterized in that: include: Controlling the fuel cell to be tested to operate under a first operating condition; Controlling the steam-water separator to obtain the gas outputted from the gas outlet of the fuel cell stack anode, and controlling the steam-water separator to perform gas-liquid separation on the gas to obtain liquid water and saturated gas; Acquiring anode inlet parameters and anode outlet parameters of the fuel cell to be tested; the anode outlet parameters include the outlet liquid water volume; the outlet liquid water volume is obtained by weighing the liquid water; Determining the inlet water content of the stack anode according to the anode inlet parameter; Determine the outlet liquid water volume and outlet gaseous water volume of the stack anode according to the anode outlet parameters; Determining a net water transfer coefficient using the inlet water content, the outlet liquid water content, and the outlet gaseous water content; When the net water transfer coefficient is a negative value, it is determined that the fuel cell has a self-humidification performance.

2. The method for evaluating the self-humidification performance of a fuel cell according to claim 1, characterized in that: The anode inlet parameters include inlet relative humidity, inlet pressure, inlet temperature and inlet water density; The step of determining the inlet water content of the anode of the stack according to the anode inlet parameter comprises: The inlet water content of the stack anode is calculated by the following formula: Inlet water content = inlet flow rate * inlet water mole fraction * inlet water density, Inlet water mole fraction = inlet relative humidity * saturated water vapor pressure / inlet pressure, Inlet water density = inlet pressure * water molar mass / (gas state constant * inlet temperature); Wherein, the inlet saturated water vapor pressure is calculated based on the inlet temperature.

3. The method for evaluating the self-humidification performance of a fuel cell according to claim 1, characterized in that: The anode outlet parameters include outlet liquid water volume, outlet pressure, outlet temperature and current under fuel cell operation state; Determining the outlet gaseous water volume of the stack anode according to the anode outlet parameter includes: The amount of gaseous water at the outlet of the stack anode is calculated by the following formula: Water mole fraction at the outlet = 1* outlet saturated water vapor pressure / outlet pressure; Water mass fraction at outlet = water mole fraction at outlet * water mole mass / (water mole fraction at outlet * water mole mass + (1-water mole fraction at outlet) * hydrogen mole mass)); The mass fraction of hydrogen at the outlet = 1-the mass fraction of water at the outlet; Hydrogen mass flow rate at the outlet = (stoichiometric ratio of reactants - 1) * current / (2 * Faraday constant); Total mass flow rate at the outlet = hydrogen mass flow rate at the outlet / hydrogen mass fraction at the outlet; The amount of gaseous water at the outlet = the total mass flow at the outlet * the mass fraction of water at the outlet; Wherein, the outlet saturated water vapor pressure is calculated based on the outlet temperature.

4. The method for evaluating the self-humidification performance of a fuel cell according to claim 1, characterized in that: The method of determining the net water transfer coefficient by using the inlet water content, the outlet liquid water content and the outlet gaseous water content comprises: The net water transfer coefficient is calculated by the following formula: Water transfer coefficient = water volume passing through the anode and cathode membranes / water volume generated by electrochemical reaction The amount of water permeating the anode and cathode membranes = outlet gaseous water volume + outlet liquid water volume - inlet gaseous water volume The amount of water generated by electrochemical reaction = 0.018*current / (2*Faraday constant).

5. The method for evaluating the self-humidification performance of a fuel cell according to claim 1, characterized in that: Also includes: The heating belt is controlled to perform heating treatment on the pipeline connected between the gas outlet of the anode of the stack and the steam-water separator.

6. The method for evaluating the self-humidification performance of a fuel cell according to claim 1, characterized in that: The first operating condition is any one of a plurality of preset operating conditions.

7. A fuel cell self-humidification performance evaluation device, characterized in that: include: An operating unit, used for controlling the fuel cell to be tested to operate under a first operating condition; A gas-liquid separation unit, used to control the steam-water separator to obtain the gas outputted from the gas outlet of the fuel cell stack anode, and to control the steam-water separator to perform gas-liquid separation on the gas to obtain liquid water and saturated gas; An acquisition unit, used for acquiring an anode inlet parameter and an anode outlet parameter of the fuel cell to be tested; the anode outlet parameter includes an outlet liquid water volume; the outlet liquid water volume is obtained by weighing the liquid water; A first determining unit, configured to determine the inlet water content of the anode of the stack according to the anode inlet parameter; A second determination unit, used to determine the outlet liquid water volume and the outlet gaseous water volume of the stack anode according to the anode outlet parameter; A third determination unit is used to determine a net water transfer coefficient using the inlet water content, the outlet liquid water content and the outlet gaseous water content; The fourth determination unit is used to determine that the fuel cell has a self-humidification performance when the net water transfer coefficient is a negative value.

8. An electronic device, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the method according to any one of claims 1 to 6 is implemented.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method according to any one of claims 1 to 6 is implemented.

10. A computer program product, comprising a computer program, characterized in that The computer program implements the method according to any one of claims 1 to 6 when executed by a processor.

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