A method and system for quickly predicting fuel cell anode pressure drop

Abstract

The present application belongs to the field of automotive structural design technology, and specifically relates to a method and system for quickly predicting the anode pressure drop of a fuel cell. The method includes obtaining the flow field structural parameters of the fuel cell stack; calculating the index factor number for measuring the anode pressure drop loss based on the structural parameters; determining the flow field plate flow channel structure category, and for non-parallel flow fields, further obtaining the bend structure parameters and calculating the index factor number of the related pressure drop loss; obtaining the operating conditions and working fluid physical parameters, and calculating auxiliary intermediate variables based on these parameters; calculating the anode flow channel pressure drop value using the index factor and intermediate variables, and evaluating the pressure drop performance of different stack structures. The present application solves the problem in the prior art that the prediction of anode pressure drop relies on complex simulation software or large data sets, and achieves the technical problem of quickly and accurately predicting anode pressure drop without external support.

Description

Technical Field

[0001] The present invention belongs to the technical field of fuel cells, and in particular relates to a method and system for quickly predicting anode pressure drop of a fuel cell. Background Art

[0002] Among modern fuel cell technologies, proton exchange membrane fuel cells (PEMFCs) are an ideal candidate for green energy devices due to their high energy efficiency and environmentally friendly properties. PEMFCs use hydrogen as fuel and convert hydrogen and oxygen into electricity through an electrochemical reaction. The only byproduct is water, achieving a truly zero-pollution environment. With the growing global demand for clean energy, PEMFCs hold enormous potential for applications in transportation, power supply, and portable power sources. However, achieving efficient operation and optimized performance of fuel cell systems remains a key challenge for both research and industry.

[0003] Optimizing fuel cell performance and reliability is essential for the industrialization of fuel cells. This involves continuous improvements in flow field design, fault diagnosis, and control strategies. Anode pressure drop is a critical parameter in fuel cell operation, directly affecting reaction efficiency and stack performance. Accurately predicting anode pressure drop not only guides flow channel structure optimization but also improves overall system stability. However, current technical approaches have many limitations:

[0004] 1. Limitations of existing flow channel design methods: For example, patent CN117494593A discloses a fuel cell flow channel design method based on model simulation. This method requires processing the bipolar plate model using a two-phase flow solver to generate simulation data, and then calculating a dimensionless parameter set. While this method can provide a theoretical basis for optimized design, its calculation process relies on complex simulation software, which is costly and cannot achieve rapid predictions in the early stages of design, increasing R&D time and costs.

[0005] 2. Deficiencies in machine learning methods: For example, patent CN118133694A describes a method for bipolar plate flow channel design using machine learning. This technology requires the establishment of a large-scale database and the use of machine learning algorithms to analyze the mapping relationship between flow channel structure and performance. This method relies on data quantity and quality. If the data is insufficient or unrepresentative, the reliability of the predictive model will be greatly reduced. Therefore, when sufficient historical data is lacking, it is difficult to apply to the actual fuel cell design process. In addition, data training and model optimization are also resource-intensive.

[0006] 3. Limitations of other indirect pressure drop optimization methods: For example, patent CN114976099A proposes a method for optimizing bipolar plate flow channels based on cooling water pressure drop. This design method determines the rationality of the flow channel design by calculating the cooling water flow rate and its pressure drop. However, it cannot directly provide a specific prediction of anode pressure drop and, therefore, cannot be applied to anode flow field fault diagnosis or control strategy optimization. It only has limited practical value for cooling structure optimization.

[0007] In summary, existing technologies typically rely on external software or large amounts of data, and are unable to quickly and accurately predict fuel cell anode voltage drop in the absence of such software or data. Therefore, a rapid prediction method that does not rely on third-party software or large datasets is urgently needed. It can accurately predict anode voltage drop through simple mathematical calculations to better meet the needs of fuel cell performance optimization and system reliability improvement. Summary of the Invention

[0008] In response to the shortcomings of the existing technology, the present invention proposes a method and system for quickly predicting the anode pressure drop of a fuel cell. This method is a fast prediction method that does not rely on third-party software or large data sets. It can accurately predict the anode pressure drop through simple mathematical calculations to better meet the needs of optimizing fuel cell performance and improving system reliability.

[0009] In one aspect, the present invention provides a method for rapidly predicting anode pressure drop of a fuel cell, the method comprising:

[0010] Step S1: obtaining flow field structure parameters of the fuel cell stack;

[0011] Step S2: calculating an index factor for measuring the anode pressure drop loss of the fuel cell stack based on the obtained flow field structure parameters of the fuel cell stack;

[0012] Step S3: Determine the flow channel structure type of the flow field plate. If it is a parallel flow field structure, directly proceed to step S10; if it is a non-parallel flow field structure, proceed to step S4;

[0013] Step S4: in the case of a non-parallel flow field, obtaining the structural parameters of the flow channel bend angle;

[0014] Step S5: Calculating the index factor of the pressure drop loss in the anode flow channel caused by the bend according to the structural parameters of the bend;

[0015] Step S6: Acquire parameters related to the fuel cell stack operating conditions;

[0016] Step S7: obtaining the physical properties of the working fluid on the anode side of the fuel cell stack;

[0017] Step S8: Calculating the index factor number and auxiliary intermediate variables of the index factor number based on the operating condition parameters obtained in step 6 and the working fluid physical property parameters obtained in step 7;

[0018] Step S9: Calculating the pressure drop value of the anode flow channel of the fuel cell based on the auxiliary intermediate variable and the calculated index factor;

[0019] Step S10: If the flow channel is a parallel flow field structure, determine whether pressure drop prediction calculation is required. If so, proceed to step S11; otherwise, proceed to step S12.

[0020] Step S11: Calculating the pressure drop value of the parallel flow field based on the index factor of the pressure drop loss and the auxiliary intermediate variable;

[0021] Step S12: comparing the pressure drop values ​​of the anode flow channel of the fuel cell stack to evaluate the pressure drop performance of different fuel cell stack structures under various operating conditions;

[0022] In step S2, the index factor for measuring the anode pressure drop loss of the fuel cell stack is The number is determined by the following formula:

[0023] ;

[0024] Where: Indicates the total length of the flow channel; Indicates the cross-sectional area of ​​the flow channel; represents the hydraulic diameter; Indicates the number of single batteries; Indicates the number of flow channels on the anode side;

[0025] In step S5, the index factor for measuring the pressure drop loss caused by the bend in the anode flow channel of the fuel cell stack is The number is determined by the following formula:

[0026] ;

[0027] Where: i represents the number of significant bends in the anode flow channel within a single cell; Indicates the total number of cells in the fuel cell stack; It represents the width of the flow channel; Indicates the depth of the flow channel; Indicates the number of flow channels on the anode side of a single cell;

[0028] In step S8, the index factor Auxiliary intermediate variables of numbers and indicator factors Auxiliary intermediate variables of numbers Determined by the following formula:

[0029] ;

[0030] ;

[0031] Where: 16 represents the constant for adjusting the fluid friction coefficient in fluid mechanics; I represents the stack current; Indicates the viscosity of the mixture; denote the molar masses of steam and hydrogen, respectively; and denote the partial pressures of steam and hydrogen respectively; represents the density of the mixture; F represents the Faraday constant; represents the discrete resistance coefficient; represents the fluid density; represents the anode stoichiometric ratio;

[0032] In step S9, the pressure drop value of the anode flow channel of the fuel cell is determined by the following formula:

[0033] ;

[0034] Where: It represents the index factor for measuring the voltage drop loss caused by the DC channel; express Auxiliary intermediate variables of numbers; It represents the index factor for measuring the additional pressure drop loss caused by the bend in the flow channel; express Auxiliary intermediate variables of numbers;

[0035] In step S11, the pressure drop of the parallel flow channels is determined by the following formula:

[0036] ;

[0037] Where: It represents the index factor for measuring the pressure drop loss caused by parallel flow channels; express Auxiliary intermediate variables of numbers.

[0038] Furthermore, in step S1 , the structural parameters of the flow field of the fuel cell stack include: the total length of a single flow channel, the cross-sectional area of ​​the flow channel, the hydraulic diameter, the number of cells in the stack, and the number of flow channels on the anode side of the cells.

[0039] Furthermore, in step S3, parallel and non-parallel flow fields are classified based on the number and angle of the bends in the flow channel. A non-parallel flow field is defined when the bend angle is greater than a certain value, while a parallel flow field is considered otherwise. This value can be determined based on actual production conditions, with a preferred value of 10.

[0040] Furthermore, in step S12, the process of comparing the detailed pressure drop values ​​based on step S9 includes: extracting from the result of step 9 The value of different battery stacks The larger the value, the greater the voltage drop loss. The simplified voltage drop value comparison process based on step 10 includes: obtaining the values ​​of the two stacks from step 2. Value, direct comparison The larger the value, the greater the pressure drop loss.

[0041] On the other hand, the present invention also provides a rapid prediction system for anode pressure drop of a fuel cell, comprising:

[0042] A parameter acquisition module, used to obtain the flow field structure parameters of the fuel cell stack;

[0043] An index factor calculation module, configured to calculate an index factor number for measuring anode pressure drop loss of a fuel cell stack according to the flow field structure parameters;

[0044] The flow channel structure judgment module is used to judge the flow channel structure type of the flow field plate. If it is a parallel flow field structure, it directly enters the calculation process of the pressure drop prediction module. If it is a non-parallel flow field structure, it enters the processing of the bend structure parameter acquisition module;

[0045] The module for obtaining the structural parameters of the bend angle is used to obtain the structural parameters of the flow channel bend angle in the case of non-parallel flow field;

[0046] A bend pressure drop factor calculation module is used to calculate an index factor for measuring the pressure drop loss caused by the bend in the anode flow channel of the fuel cell stack based on the bend structural parameters;

[0047] An operating condition parameter acquisition module is used to obtain parameters related to the operating condition of the fuel cell stack;

[0048] A physical property parameter acquisition module is used to obtain the physical property parameters of the working fluid on the anode side of the fuel cell stack;

[0049] Auxiliary variable calculation module, used to calculate the index factor number based on working condition parameters and physical parameters Auxiliary intermediate variables and indicator factors Auxiliary intermediate variables of numbers ;

[0050] Non-parallel flow field pressure drop calculation module is used to calculate the pressure drop of the non-parallel flow field according to the auxiliary intermediate variables. 、 and indicator factors number, Calculate the pressure drop value of the anode flow channel of the fuel cell;

[0051] The parallel flow field pressure drop judgment module is used to judge whether pressure drop prediction calculation is needed when the flow channel has a parallel flow field structure, and execute the corresponding calculation process according to the judgment result;

[0052] Parallel flow field pressure drop calculation module, used to measure the index factor of pressure drop loss caused by straight flow channel Numbers and auxiliary intermediate variables Calculate the pressure drop in parallel flow channels;

[0053] The pressure drop performance evaluation module is used to compare the pressure drop values ​​of the anode flow channel of the fuel cell stack to evaluate the pressure drop performance of different fuel cell stack structures under various operating conditions.

[0054] The beneficial effects of the present invention are:

[0055] First, the rapid prediction method of the fuel cell anode pressure drop of the present invention obtains and analyzes flow field structure parameters, operating conditions and physical property data to accurately calculate the anode pressure drop loss and optimize the pressure drop analysis process. It does not need to rely on third-party software or large data sets. It can accurately predict the anode pressure drop through simple mathematical calculations, thereby effectively improving the efficiency and accuracy of pressure drop prediction, supporting flexible response to different flow field structures, and providing a scientific basis for design optimization, reducing energy loss, and improving the overall performance and operating stability of the fuel cell stack, so as to better meet the needs of performance optimization and system reliability improvement.

[0056] Second, in a preferred implementation, the present invention calculates the index factor of the anode pressure drop loss by the flow field structure parameters of the fuel cell stack. , can quickly evaluate and compare the pressure drop performance of different design options, which helps to optimize the flow field plate design.

[0057] Third, in a preferred implementation, the present invention can simplify or refine the pressure drop calculation process based on the number of bends in the flow channel.

[0058] Fourth, in a preferred implementation, the present invention calculates the pressure drop loss index factor caused by the bend in the anode flow channel through step S5. , which can quantify the effect of bend angle on pressure drop and provide data support for optimizing the flow channel geometry, thereby reducing additional pressure drop loss.

[0059] Fifth, in the preferred implementation, the present invention calculates the index factor and Auxiliary intermediate variables and , which can accurately quantify the impact of the discrete resistance caused by the along-the-line resistance and the bend angle on the pressure drop. This process comprehensively considers the physical properties of the mixed gas and the operating characteristics of the fuel cell stack, simplifying the complex fluid dynamics analysis.

[0060] Sixth, in a preferred implementation, the present invention divides the pressure drop of the fuel cell anode flow channel into the contributions of the straight flow channel and the curved flow channel, and calculates them separately, which can accurately identify and quantify the impact of different structures on the total pressure drop.

[0061] Seventh, in the preferred implementation, the present invention provides a detailed and simplified pressure drop comparison method, which can flexibly select different fuel cell stack structures for pressure drop analysis as needed. This method can not only perform accurate comparisons to optimize the design when needed, but also accelerate the analysis process in early evaluation, improve design efficiency and guide flow field optimization.

[0062] Eighth, the rapid prediction system of the fuel cell anode pressure drop of the present invention uses a modular design to accurately obtain flow field and operating parameters, and flexibly select appropriate pressure drop calculation paths to achieve efficient evaluation and optimization analysis of pressure drop losses, thereby significantly improving the efficiency and performance of fuel cell design, supporting more accurate flow field optimization, reducing energy loss and improving overall system stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] Figure 1 is a flow chart of a method for rapidly predicting anode pressure drop of a fuel cell according to the present invention;

[0064] Figure 2 is a schematic diagram of flow field structural parameters of an anode plate of a fuel cell stack according to an embodiment of the present invention;

[0065] Figure 3 Schematic diagram of structural parameters of bend angles in the flow field of an anode plate of a fuel cell stack according to an embodiment of the present invention. DETAILED DESCRIPTION

[0066] In order to enable those skilled in the art to better understand the technical solution of the present application, the present application will be further described in detail below with reference to the accompanying drawings and embodiments.

[0067] In the description of this application, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance; the term "plurality" refers to two or more, unless otherwise expressly defined. Terms such as "installed", "connected", "connected", and "fixed" should be understood in a broad sense. For example, "connected" can mean a fixed connection, a detachable connection, or an integral connection; "connected" can mean a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0068] In the description of this application, it should be understood that the terms "up", "down", "left", "right", "front", "back", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on this application.

[0069] Throughout this specification, terms such as "one embodiment / method," "some embodiments / methods," and "specific embodiments / methods" mean that the specific features, structures, materials, or characteristics described in conjunction with that embodiment / method or example are included in at least one embodiment / method or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment / method or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments / methods or examples.

[0070] As the instruction manual Figure 1 The present invention aims to provide a method for rapidly predicting the anode pressure drop of a fuel cell, comprising:

[0071] Step S1: Acquire structural parameters of the flow field of the fuel cell stack.

[0072] The purpose of step S1 is to provide an accurate data basis for pressure drop prediction and stack design optimization by measuring and recording the flow field structural parameters of the fuel cell stack.

[0073] It should be noted that each cell consists of three main components: an anode flow field plate, a membrane electrode assembly (MEA), and a cathode flow field plate. This design ensures that hydrogen and oxygen flow to the anode and cathode catalyst layers, respectively, to complete the electrochemical reaction. The anode flow field plate is directly connected to the anode catalyst layer of the MEA and features a specially designed flow channel structure to guide and distribute hydrogen. Hydrogen is evenly distributed through these flow channels to the surface of the anode catalyst layer, where it undergoes an electrochemical reaction under the action of the catalyst, generating electrons and protons. The anode catalyst layer is coated on one side of the MEA's electrolyte membrane, where hydrogen molecules are decomposed into electrons and protons. Electrons flow through an external circuit, generating current, while protons migrate through the electrolyte membrane toward the cathode. The cathode flow field plate is directly connected to the cathode catalyst layer and also features a flow channel structure specifically designed to guide the flow of oxygen or air. Oxygen is evenly distributed within these flow channels to the cathode catalyst layer, where it combines with protons conducted from the anode and electrons returned from the external circuit to generate water and release energy. The cathode catalyst layer, coated on the other side of the electrolyte membrane, works with the flow field plate to complete the electrochemical reaction, ensuring the timely removal of moisture and heat to maintain normal system operation. The proton exchange membrane, located between the anode and cathode catalyst layers, primarily conducts protons and blocks electrons, allowing electrons to flow through the external circuit and generate usable current.

[0074] The flow field of a fuel cell stack refers to the flow channel structure designed on the anode flow field plate and the cathode flow field plate, which is used to guide and distribute the reaction gases (such as hydrogen and oxygen) on the anode and cathode catalyst layers of the fuel cell unit, while effectively removing the moisture and heat generated by the reaction.

[0075] Therefore, obtaining the structural parameters of the fuel cell stack flow field is a key step in pressure drop prediction and performance optimization. These parameters include the total length of a single flow channel, the cross-sectional area of ​​the flow channel, the hydraulic diameter, the number of cells in the stack, and the number of flow channels on the anode side of each cell.

[0076] Specifically, the total length of a single flow channel, L, refers to the complete length of the flow channel from inlet to outlet, including all straight and curved sections, and is typically measured in meters (m). This can be obtained from supplier data or direct measurement. Measurements should be made along the actual flow channel path using precision measuring tools such as a ruler or vernier caliper.

[0077] The cross-sectional area A of the flow channel is typically measured in square meters (m²). The cross-sectional shapes of the flow channels on the anode and cathode flow field plates or bipolar plates include rectangular, trapezoidal, semicircular, curved, and wedge-shaped. The most common shape is rectangular, with a flat top and bottom and vertical sidewalls. For rectangular channels, the calculation formula is width multiplied by depth. Use a precise measuring tool, such as a vernier caliper or micrometer screw, to measure the width and depth of the flow channel and calculate the cross-sectional area. If necessary, perform multiple measurements and average them for improved accuracy.

[0078] Hydraulic diameter A parameter of the flow channel characteristic used to calculate pressure drop and fluid dynamics analysis. The cross-sectional area and wetted perimeter (i.e., the perimeter where the fluid contacts the boundary of the flow channel section) are calculated based on the measured width and depth of the flow channel, and then substituted into the formula to calculate the hydraulic diameter. For a rectangular cross-section flow channel, the hydraulic diameter calculation formula is:

[0079] (1);

[0080] Where: A represents the cross-sectional area of ​​the flow channel; P represents the wetted perimeter (for flow channel sections of different shapes, the wetted perimeter is calculated differently. The wetted perimeter of a rectangular cross-sectional flow channel is 2×(W+H)).

[0081] Number of cells in the stack Refers to the number of cells stacked in a fuel cell stack, usually an integer. Obtained directly from the supplier's technical data or design drawings.

[0082] Number of flow channels on the anode side of a single cell This refers to the number of flow channels on the anode side of each cell, which affects gas distribution and pressure drop. This number can be read from the design drawings or confirmed through actual observation.

[0083] Step S2: Based on the obtained flow field structure parameters of the fuel cell stack, calculate the index factor for measuring the anode pressure drop loss of the fuel cell stack number.

[0084] Specifically, in order to quickly predict and compare the anode pressure drop of different fuel cell stacks, this step proposes an innovative measurement method, namely the "new index factor number". The physical meaning of the number is to characterize the magnitude of the anode voltage drop in the parallel flow field. By calculating this value, we can effectively compare the voltage drop losses of different stack structures and assist in design optimization.

[0085] The number indicates the relative size of the anode voltage drop loss under the same operating conditions. The larger the number, the more significant the anode voltage drop loss; The smaller the number, the smaller the pressure drop loss. The data is an important tool for analyzing and comparing the performance of flow field design schemes, especially in the initial stage of stack design, which can help engineers optimize the flow field design. Depending on the size of the number, engineers can adjust the flow path length, cross-sectional area or optimize the hydraulic diameter to improve the overall performance of the fuel cell stack.

[0086] As the instruction manual Figure 2 , Figure 2 A schematic diagram showing the flow field structure parameters of the anode plate of a fuel cell stack is shown. The index factor for measuring the anode pressure drop loss of a fuel cell stack is shown. The number is determined by the following formula:

[0087] (2);

[0088] Where: Indicates the total length of the flow channel; Indicates the cross-sectional area of ​​the flow channel; represents the hydraulic diameter; Indicates the number of single batteries; Indicates the number of flow channels on the anode side.

[0089] From formula (2), it can be seen that the longer the flow channel length, the greater the pressure drop loss during the gas flow. The larger the flow channel cross-sectional area, the smaller the fluid resistance, so the pressure drop loss is reduced. The larger the hydraulic diameter, the smaller the gas flow resistance, and the pressure drop loss is reduced. The more single cells are stacked, the smaller the pressure drop contribution of each single cell. The more flow channels there are, the less gas flow is shared by each flow channel, and the flow resistance and pressure drop loss are smaller. Therefore, when the calculated When the number is large, it indicates that the pressure drop loss is large. You can try to increase the cross-sectional area of ​​the flow channel or optimize the hydraulic diameter to reduce the pressure drop, and increase the number of flow channels on the anode side. It can effectively improve gas distribution and reduce pressure drop loss.

[0090] Step S3: Determine the flow channel structure type of the flow field plate. If it is a parallel flow field structure, directly proceed to step S10; if it is a non-parallel flow field structure, proceed to step S4.

[0091] It should be noted that even if the flow field plate is parallel to the flow field, step S4 can still be performed if calculation accuracy is required or there are many bends in the flow field. The purpose of step S3 is to select an appropriate calculation path based on the structural characteristics of the flow field plate to optimize the efficiency and accuracy of the pressure drop prediction method.

[0092] Specifically, the flow field plate divides the flow channel into parallel flow field and non-parallel flow field based on the geometric structure of its flow channel and the flow characteristics of the fluid in the flow channel. A parallel flow field means that the flow channel is mainly composed of straight segments, the gas flow path is parallel and smooth, there are fewer bends or corners in the flow channel, or the angle of the bend is small, which will not significantly affect the flow direction and flow resistance of the gas. Parallel flow fields are usually used to design simpler fuel cell stacks to reduce gas flow resistance and pressure drop. A non-parallel flow field means that the flow channel contains multiple significant bends or complex curved paths (such as a serpentine flow field), and the gas flow direction changes frequently, resulting in additional flow resistance and pressure drop. The non-parallel flow field design is used to improve the uniformity of gas distribution and the reaction efficiency of the catalyst layer, but the computational complexity is high.

[0093] The present invention determines the flow field based on the number of bends and the cumulative angles of the bends in the flow channel. When the number of significant bends in the flow channel reaches or exceeds 10, it can be classified as a non-parallel flow field. Significant bends refer to bends with an angle greater than 30 degrees, which usually have a significant impact on the gas flow direction and flow resistance. If the cumulative angle of all bends exceeds 360 degrees (i.e., a complete circular angle), it can be further confirmed as a non-parallel flow field. This standard is used to measure the overall degree of tortuosity of the flow channel and serves as an auxiliary basis for judgment.

[0094] The specific operation method is: using design drawings, 3D models or actual flow field plate structures as input, use CAD software or 3D modeling tools to display the path of the flow channel, and mark the straight segments and bend segments. Mark each bend in the flow channel one by one and record its number. Significant bends must meet the standard of an angle greater than 30 degrees. Calculate the cumulative angle of all bends. If the cumulative angle exceeds 360 degrees, it is further confirmed as a non-parallel flow field. When the number of significant bends is less than 10, and the cumulative bend angle is less than 360 degrees, it is determined to be a parallel flow field, and the simplified calculation path step S10 can be executed directly. When the number of significant bends reaches or exceeds 10, or the cumulative bend angle exceeds 360 degrees, it is determined to be a non-parallel flow field, and the complex calculation path step S4 is executed.

[0095] For example, following the specific instructions in this step, calculate the significant bends and their number in the flow field plate's flow channel. If the flow channel has six significant bends, each 20 degrees, for a total of 120 degrees, and the flow path is primarily composed of long straight segments, then the flow field can be determined to be parallel, simplifying the pressure drop calculation. If the flow channel has 12 significant bends, each 45 degrees, for a total of 540 degrees, then the flow field is determined to be non-parallel, requiring more complex calculations.

[0096] Step S4: In the case of a non-parallel flow field, obtaining structural parameters of the flow channel bend angle.

[0097] The purpose of step S4 is to obtain and calculate the structural parameters related to the channel bend angle to further analyze the effect of the bend angle on the flow resistance and pressure drop. Obtaining these parameters is the basis for the subsequent calculation of the new index factor. The additional pressure drop loss caused by the bend is accurately evaluated based on the number.

[0098] The bend structure parameters include: the number of bends in the anode flow channel within a single cell, the channel width, and the channel depth.

[0099] Specifically, the number of bends in the anode flow channel within a single cell refers to the total number of significant bends in the anode flow channel within the single cell. Using CAD software or a 3D modeling tool, mark each bend individually on a design drawing and count the total number of significant bends, i.

[0100] Runner width Refers to the transverse width of a flow channel, typically measured in meters (m). This is used to calculate the channel cross-section and flow resistance. A precision vernier caliper can be used to measure the channel width, ensuring that the measurement points are evenly distributed and taking an average value to reduce errors.

[0101] Runner depth This refers to the vertical depth of a flow channel. Together with the channel width, it determines the channel's cross-sectional area and hydraulic characteristics. Measure the channel depth using a depth measurement tool or high-precision measuring instrument. Perform multiple measurements and record the average.

[0102] Step S5: Calculate the index factor of the pressure drop loss in the anode flow channel caused by the bend according to the structural parameters of the bend number.

[0103] The purpose of step S5 is to calculate The additional pressure drop loss in the anode flow channel of the fuel cell stack caused by the change of direction of the fluid at the bend is quantified and evaluated. The data focuses on the contribution of turns to gas flow resistance, providing designers with a basis for optimizing the flow channel geometry, thereby reducing energy loss and improving the overall efficiency of the fuel cell stack. The α-value is another key indicator for measuring anode pressure drop in fuel cell stacks, innovatively proposed by this invention. It specifically characterizes the impact of channel bends on pressure drop. When a channel contains multiple significant bends, the gas flow direction changes frequently, creating additional resistance and increasing pressure drop. The larger the number, the more significant the contribution of the bend angle to the pressure drop.

[0104] As the instruction manual Figure 3 , Figure 3 A schematic diagram showing the structural parameters of the bend in the flow field of the anode plate of a fuel cell stack is shown. An index factor for measuring the pressure drop loss caused by the bend in the anode flow channel of a fuel cell stack is shown. The number is determined by the following formula:

[0105] (3);

[0106] Where: i represents the number of significant bends in the anode flow channel within a single cell; Indicates the total number of cells in the fuel cell stack; It represents the width of the flow channel; Indicates the depth of the flow channel; Indicates the number of flow channels on the anode side of a single cell.

[0107] From formula (3), we can see that when the number of bends increases, The larger the value, the more bends there are, and the greater the additional pressure drop loss caused by the turns. Therefore, in the flow channel design, the number of significant bends should be reduced as much as possible to reduce the pressure drop loss. When it increases, The value increases, which indicates that as the number of single cells increases, the pressure drop loss effect caused by the bends in the entire stack increases cumulatively. Therefore, when increasing the number of single cells, special attention should be paid to the optimization of the flow channel design. ,depth and the number of anode side channels appears in square form, when any of these parameters increases, A smaller value indicates that larger channel dimensions, or a greater number of channels on the anode side, result in a smaller pressure drop. Optimizing channel width and depth, and increasing the number of channels, can effectively reduce pressure drop caused by bends.

[0108] Step S6: Obtain parameters related to the fuel cell stack operating conditions.

[0109] The purpose of step S6 is to obtain and define key parameters related to the fuel cell stack's operating conditions. These parameters directly impact the fluid dynamics and anode pressure drop calculations. These operating parameters include stack current, anode stoichiometry, saturated vapor pressure, and hydrogen partial pressure. Accurately measuring and acquiring these parameters is crucial for subsequent pressure drop calculations and optimizing fuel cell performance.

[0110] Specifically, stack current I refers to the current output by the fuel cell stack during operation. This parameter reflects the electrochemical reaction rate, affecting hydrogen consumption and fluid dynamics. A high-precision current sensor or ammeter is used to monitor the stack current in real time, with an appropriate sampling frequency (e.g., once per second) to capture the dynamic characteristics of current changes and record current variations under different operating conditions, such as startup, stable operation, and high load. If theoretical calculations are used during the design phase, estimates can be made based on the fuel cell stack's load requirements and application scenarios.

[0111] Anode stoichiometric ratio This is the ratio of hydrogen supply to actual demand, affecting anode reaction efficiency and gas flow stability. Ensuring λ > 1 prevents hydrogen supply shortages. A higher stoichiometric ratio can reduce anode gas starvation, but it increases system complexity and energy consumption. In actual operation, a mass flow controller (MFC) is used to precisely control and measure hydrogen flow. By recording hydrogen flow at different current outputs, the stoichiometric ratio is ensured to remain within the designed range. During the design phase, an appropriate stoichiometric ratio can be selected based on performance requirements.

[0112] Saturated vapor pressure (SVP) is the pressure generated by vapor in a hydrogen fluid environment and is significantly affected by temperature. This pressure influences the degree of gas wetting within the flow path, which in turn affects pressure drop and water management performance. Depending on the operating temperature of the fuel cell stack, this can be measured in real time by consulting a standard vapor pressure gauge or using a sensor.

[0113] Hydrogen partial pressure The hydrogen partial pressure at the anode side affects the hydrogen transfer rate and electrochemical reaction efficiency. A higher hydrogen partial pressure generally improves reaction efficiency, but it also affects pressure drop. In actual systems, a pressure sensor can be used to measure the hydrogen partial pressure at the anode inlet to ensure real-time monitoring. During the design phase, this value should be estimated and set based on anode gas supply conditions and system requirements.

[0114] Step S7: Obtaining the physical properties of the working fluid on the anode side of the fuel cell stack.

[0115] The purpose of step S7 is to obtain the key physical properties of the working fluid (hydrogen or hydrogen-steam mixture) on the anode side of the fuel cell stack, including viscosity, molar mass, density, and discrete resistance coefficient. These parameters directly affect gas flow characteristics and pressure drop analysis and are crucial for accurately calculating anode pressure drop.

[0116] Specifically, the viscosity of hydrogen (or hydrogen vapor mixture) This refers to the viscous drag of hydrogen or hydrogen-vapor mixtures, which affects the flow resistance and pressure drop of the gas within the flow channel. Methods for obtaining this value include experimental measurement or table lookup. Experimental measurement involves using a viscometer to measure the viscosity of hydrogen or hydrogen-vapor mixtures, particularly under varying temperature and pressure conditions to accommodate the operating environment of the fuel cell stack. Table lookup involves obtaining viscosity values ​​at known temperature and pressure by consulting a fluid properties manual or using specialized chemical engineering software (such as Aspen or COMSOL).

[0117] Molar mass of hydrogen is the molecular weight of pure hydrogen and is used to calculate the total molar mass of a gas mixture. The standard molar mass of hydrogen, 2.016 g / mol, can be used directly.

[0118] Molar mass of steam is the molecular weight of steam and is used in calculations for mixtures of hydrogen and steam. The standard molar mass of water vapor, 18.015 g / mol, can be used directly.

[0119] Density of hydrogen (or hydrogen vapor mixture) The density of hydrogen or hydrogen vapor mixture affects the gas flow characteristics and dynamic behavior. The total density can be calculated based on the ideal gas equation or the physical properties of the gas mixture:

[0120] (4);

[0121] Where: P represents the gas pressure; M represents the total molar mass of the gas; R represents the ideal gas constant; T represents the absolute temperature of the gas.

[0122] You can also use the table lookup method to obtain the density value from the fluid physical properties handbook under common operating conditions.

[0123] Discrete drag coefficient This parameter characterizes the additional resistance to gas flow caused by the shape and surface roughness of the flow channel. Methods for obtaining this parameter include experimental measurement, numerical simulation, and empirical selection. Experimental measurement involves determining the discrete resistance coefficient through fluid dynamics measurements within a specific flow channel. Numerical simulation uses computational fluid dynamics (CFD) software to simulate the flow behavior of gas within the flow channel and calculate the resistance coefficient γ. Empirical selection can be performed by researchers in this field based on empirical results from past R&D and design.

[0124] Step S8: Calculate the index factor based on the working condition parameters obtained in step 6 and the working fluid physical parameters obtained in step 7 Number and index factor Auxiliary intermediate variables of numbers.

[0125] The purpose of step S8 is to provide the necessary input data for the subsequent calculation of specific pressure drop values ​​by calculating auxiliary intermediate variables. These auxiliary variables integrate the flow characteristics of the gas and the pressure drop loss, simplifying complex physical phenomena into numerical expressions, thereby making the analysis, optimization, and design processes more convenient and accurate.

[0126] Auxiliary intermediate variables include and , which are related to the viscous resistance and discrete resistance of the fluid respectively. The specific calculation is as follows:

[0127] (5);

[0128] (6);

[0129] Where: 16 represents the constant for adjusting the fluid friction coefficient in fluid mechanics (used to normalize physical quantities related to gas flow to ensure that the calculated results are consistent with experimental data); I represents the stack current; Indicates the viscosity of the mixture; denote the molar masses of steam and hydrogen, respectively; and denote the partial pressures of steam and hydrogen respectively; represents the density of the mixture; F represents the Faraday constant; represents the discrete resistance coefficient; represents the fluid density; represents the anode stoichiometric ratio.

[0130] From formula (5), we can see that the viscosity Combined with the current I, it is possible to measure the contribution of the fluid's internal friction to the pressure drop. This term is used to describe the actual flow rate of the mixed gas, which can dynamically adapt to the impact of different operating conditions (such as current changes) on the pressure drop. This method helps to improve the flexibility and accuracy of the calculation and is suitable for analysis under various operating conditions. By taking into account the characteristics of steam and hydrogen, the actual flow behavior of the mixture can be more accurately simulated, helping to optimize the water management system and prevent water blockage or water shortage. Density The introduction of helps more accurately assess the impact of mixed fluid inertia on system stability. Denser mixtures have greater flow resistance, and introducing this parameter can better predict pressure drop behavior under different loads and avoid system instability.

[0131] From formula (6), it can be seen that the introduction of discrete resistance coefficient , the effect of the actual flow channel geometry and surface roughness on gas flow can be simulated. This method makes the calculation closer to the actual working conditions, can more accurately reflect the pressure drop loss under non-ideal flow conditions, and provide strong support for optimizing the flow channel geometry. By adjusting the γ value, the effect of different flow channel designs on the pressure drop can be analyzed, helping to select the optimal flow channel structure and improve overall performance. Stoichiometric ratio It is used to measure whether the hydrogen supply is sufficient, helping designers ensure that the electrochemical reaction can proceed fully. This can avoid performance degradation caused by insufficient hydrogen supply and also help reduce unnecessary hydrogen waste.

[0132] The nonlinear term in the formula The introduction of captures complex gas dynamics. This allows for better adaptation to dynamic and complex operating conditions, providing data support for stable system operation under varying conditions. The squared term enhances sensitivity to pressure drop variations, refining the analysis of fluid dynamics effects and thus improving design and control accuracy.

[0133] Step S9: Calculate the pressure drop value of the anode flow channel of the fuel cell based on the auxiliary intermediate variable and the calculated index factor.

[0134] The purpose of step S9 is to provide a direct basis for judging and comparing the pressure drop performance of different flow field plate designs based on the calculated specific pressure drop value of the fuel cell anode flow channel.

[0135] The pressure drop value of the anode flow channel of the fuel cell is determined by the following formula:

[0136] (7);

[0137] Where: It represents the index factor for measuring the voltage drop loss caused by the DC channel; express Auxiliary intermediate variables of numbers; It represents the index factor for measuring the additional pressure drop loss caused by the bend in the flow channel; express Auxiliary intermediate variables of numbers.

[0138] In formula (7), The voltage drop contribution of the DC channel can be obtained by The pressure drop contribution of the bend in the flow channel can be obtained. The numerical value of is used to identify the design scheme with large pressure drop loss, providing a specific direction for the next step of optimizing the flow field plate.

[0139] Step S10: If the flow channel is a parallel flow field structure, determine whether pressure drop prediction calculation is required. If so, proceed to step S11; otherwise, proceed to step S12.

[0140] The purpose of step S10 is to determine whether a specific pressure drop prediction is required based on the structural characteristics of the flow field plate, thereby simplifying the calculation process or accurately performing pressure drop analysis. This process helps optimize computing resources and improve computational efficiency, while also providing flexible analysis options to accommodate different flow field plate design requirements.

[0141] Specifically, when the flow field plate is a parallel structure, that is, the flow channel is composed of straight segments, the number of bends is small or the turning angle is small, the pressure drop loss mainly comes from the straight channel, and the additional pressure drop caused by the elbow does not need to be considered. If the user or design requirements do not require detailed pressure drop values, only the relative size needs to be determined, then directly execute step 12 to compare the pressure drop sizes of the two stacks. This situation is suitable for quickly evaluating the relative advantages and disadvantages of different schemes in the early design stage of the fuel cell stack and shortening the analysis time. If the user or design requirements require precise pressure drop values, continue to step 11 and perform specific numerical calculations. This situation is suitable for detailed performance optimization of the fuel cell stack to ensure the stability and efficiency of the flow channel design under all working conditions.

[0142] Step S11: Calculate the pressure drop value of the parallel flow field based on the index factor of the pressure drop loss and the auxiliary intermediate variable.

[0143] The voltage drop in the DC channel is determined by the following formula:

[0144] (8);

[0145] Where: It represents the index factor for measuring the voltage drop loss caused by the DC channel; express Auxiliary intermediate variables of numbers.

[0146] Step S12: comparing the pressure drop values ​​of the anode flow channels of the fuel cell stacks to evaluate the pressure drop performance of different fuel cell stack structures under various operating conditions.

[0147] Specifically, the detailed pressure drop value comparison process based on step S9 includes: extracting from the result of step 9 The value of different battery stacks Comparisons are made. A larger value indicates a greater pressure drop loss. Based on the comparison results, determine which design has the lower pressure drop and then select the better design or further optimize the high pressure drop solution.

[0148] The simplified voltage drop comparison process based on step 10 includes: obtaining the voltage drop values ​​of the two stacks from step 2 Value, direct comparison The larger the value, the greater the pressure drop loss. This method significantly improves the comparison speed and is suitable for rapid evaluation or preliminary design stages, especially when dealing with pressure drop analysis of simple parallel flow fields.

[0149] Another object of the present invention is to provide a rapid prediction system for anode pressure drop of a fuel cell, comprising:

[0150] The parameter acquisition module is used to obtain the flow field structure parameters of the fuel cell stack.

[0151] The index factor calculation module is used to calculate the index factor number used to measure the anode pressure drop loss of the fuel cell stack according to the flow field structure parameters.

[0152] The flow channel structure judgment module is used to judge the flow channel structure type of the flow field plate. If it is a parallel flow field structure, it directly enters the calculation process of the pressure drop prediction module. If it is a non-parallel flow field structure, it enters the processing of the bend structure parameter acquisition module.

[0153] The bend structure parameter acquisition module is used to obtain the structural parameters of the flow channel bend in the case of a non-parallel flow field.

[0154] The bend pressure drop factor calculation module is used to calculate the index factor for measuring the pressure drop loss caused by the bend in the anode flow channel of the fuel cell stack based on the bend structural parameters. Number and index factor number.

[0155] The operating condition parameter acquisition module is used to obtain parameters related to the operating condition of the fuel cell stack.

[0156] The physical property parameter acquisition module is used to obtain the physical property parameters of the working fluid on the anode side of the fuel cell stack.

[0157] Auxiliary variable calculation module, used to calculate index factors based on operating parameters and physical parameters Auxiliary intermediate variables of numbers and indicator factors Auxiliary intermediate variables of numbers .

[0158] Non-parallel flow field pressure drop calculation module is used to calculate the pressure drop of the non-parallel flow field according to the auxiliary intermediate variables. 、 and indicator factors number, The pressure drop value of the anode flow channel of the fuel cell is calculated.

[0159] The parallel flow field pressure drop judgment module is used to judge whether pressure drop prediction calculation is needed when the flow channel has a parallel flow field structure, and execute the corresponding calculation process according to the judgment result.

[0160] Parallel flow field pressure drop calculation module, used to measure the index factor of pressure drop loss caused by straight flow channel Numbers and auxiliary intermediate variables Calculate the pressure drop for parallel flow paths.

[0161] The pressure drop performance evaluation module is used to compare the pressure drop values ​​of the anode flow channel of the fuel cell stack to evaluate the pressure drop performance of different fuel cell stack structures under various operating conditions.

[0162] Example 1

[0163] In this embodiment, the fuel cell stack is composed of 50 cells stacked in series and is used for transportation applications with high-efficiency energy output. The stack operating parameters include a rated stack current I of 200A, an anode stoichiometric ratio λ of 1.5, an operating temperature of 70°C, and a saturated steam pressure of 1.5. 0.03MPa, hydrogen partial pressure The pressure drop is 0.1 MPa. Each cell is equipped with an anode flow field plate, which guides and distributes hydrogen flow and works with the catalyst layer to achieve efficient electrochemical reaction. This example uses a rectangular cross-section direct current channel structure to reduce pressure drop and improve gas distribution uniformity. The prediction is performed using the rapid prediction method for fuel cell anode pressure drop.

[0164] First, the structural parameters of the fuel cell stack's flow field are obtained. In this example, the total length of each flow channel is 1.5 meters (1500 mm). The measurement path includes all straight lines and necessary bends to ensure that the gas can flow smoothly to the anode catalyst layer. The flow channel width W is 2 mm, and the flow channel depth H is 1 mm. The flow channel cross-sectional area A = W × H = 2 × For a rectangular cross-section flow channel, the wet perimeter P = 2 × (W + H) = 6 × m, hydraulic diameter =4×A / P=1.33× The anode side of each cell is designed with 25 parallel flow channels, evenly distributed on the flow field plate, to balance hydrogen distribution and reduce pressure drop. The fuel cell stack contains 50 cells.

[0165] The measured parameters are used to calculate the index factor for measuring the voltage drop caused by the DC channel. numbers, providing a basis for design optimization. In this embodiment, since the flow channel is designed as a linear structure, the number of significant bends is small (less than 10), and the turning angle is also within 30 degrees, a simplified path is used for pressure drop prediction. If the pressure drop loss is large, the cross-sectional area A can be increased by increasing the flow channel width W or depth H, or the hydraulic diameter d can be optimized. If further optimization is required, the gas flow rate can be distributed and the flow resistance can be reduced by increasing the number of flow channels on the anode side of the single cell. This embodiment provides a specific direction for optimizing the design of the anode flow field plate through precise flow channel parameter measurement and pressure drop calculation, helping to reduce energy loss and improve the overall performance of the fuel cell stack.

[0166] The present invention's rapid fuel cell anode pressure drop prediction method and system accurately assesses pressure drop losses through simple mathematical calculations, improving prediction efficiency and accuracy. This method comprehensively analyzes flow field parameters, operating conditions, and physical property data to quantify the pressure drop contributions of straight and curved flow channels. It supports flexible selection of detailed or simplified analysis paths, providing a scientific basis for optimizing flow field design, thereby reducing energy losses and improving system stability.

[0167] The above is only an embodiment of the present invention, and common sense such as the specific structure and characteristics of the scheme are not described in detail here. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes that fall within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claim involved.

Claims

1. A method for rapidly predicting anode pressure drop of a fuel cell, characterized in that: Methods include: Step S1: obtaining flow field structure parameters of the fuel cell stack; Step S2: Based on the obtained flow field structure parameters of the fuel cell stack, calculate the index factor for measuring the anode pressure drop loss of the fuel cell stack number; Step S3: Determine the flow channel structure type of the flow field plate. If it is a parallel flow field structure, directly proceed to step S10; if it is a non-parallel flow field structure, proceed to step S4; Step S4: in the case of a non-parallel flow field, obtaining the structural parameters of the flow channel bend angle; Step S5: Calculate the index factor of the pressure drop loss in the anode flow channel caused by the bend according to the structural parameters of the bend number; Step S6: Acquire parameters related to the fuel cell stack operating conditions; Step S7: obtaining the physical properties of the working fluid on the anode side of the fuel cell stack; Step S8: Calculate the index factor based on the working condition parameters obtained in step 6 and the working fluid physical parameters obtained in step 7 Auxiliary intermediate variables of numbers and indicator factors Auxiliary intermediate variables of numbers ; Step S9: Calculating the pressure drop value of the non-parallel flow field of the anode flow channel of the fuel cell based on the auxiliary intermediate variable and the corresponding index factor of step S8; Step S10: If the flow channel is a parallel flow field structure, determine whether pressure drop prediction calculation is required. If so, proceed to step S11; otherwise, proceed to step S12. Step S11: Obtain parameters related to the fuel cell stack operating conditions and the working fluid physical properties of the fuel cell stack anode side, and calculate the index factor of the pressure drop loss Auxiliary intermediate variables , based on the index factor of pressure drop loss and auxiliary intermediate variables, calculate the pressure drop value of the parallel flow field; Step S12: comparing the pressure drop values ​​of the anode flow channel of the fuel cell stack to evaluate the pressure drop performance of different fuel cell stack structures under various operating conditions; In step S2, the index factor for measuring the anode pressure drop loss of the fuel cell stack is The number is determined by the following formula: ； Where: Indicates the total length of the flow channel; Indicates the cross-sectional area of ​​the flow channel; represents the hydraulic diameter; Indicates the number of single batteries; Indicates the number of flow channels on the anode side; In step S5, the index factor for measuring the pressure drop loss caused by the bend in the anode flow channel of the fuel cell stack is The number is determined by the following formula: ； Where: i represents the number of significant bends in the anode flow channel within a single cell; Indicates the total number of cells in the fuel cell stack; It represents the width of the flow channel; Indicates the depth of the flow channel; Indicates the number of flow channels on the anode side of a single cell; In step S8, the index factor Auxiliary intermediate variables of numbers and indicator factors Auxiliary intermediate variables of numbers Determined by the following formula: ； Where: 16 represents the constant for adjusting the fluid friction coefficient in fluid mechanics; I represents the stack current; Indicates the viscosity of the mixture; denote the molar masses of steam and hydrogen, respectively; and denote the partial pressures of steam and hydrogen respectively; represents the density of the mixture; F represents the Faraday constant; represents the discrete resistance coefficient; represents the fluid density; represents the anode stoichiometric ratio; In step S9, the pressure drop value of the anode flow channel of the fuel cell is determined by the following formula: ； Where: It represents the index factor for measuring the voltage drop loss caused by the DC channel; express Auxiliary intermediate variables of numbers; It represents the index factor for measuring the additional pressure drop loss caused by the bend in the flow channel; express Auxiliary intermediate variables of numbers; In step S11, the pressure drop value of the parallel flow channel is determined by the following formula: ； Where: It represents the index factor for measuring the pressure drop loss caused by parallel flow channels; express Auxiliary intermediate variables of numbers.

2. The method for rapid prediction of fuel cell anode pressure drop according to claim 1, characterized in that: In step S1 , the structural parameters of the flow field of the fuel cell stack include: the total length of a single flow channel, the cross-sectional area of ​​the flow channel, the hydraulic diameter, the number of cells in the stack, and the number of flow channels on the anode side of the cells.

3. The method for rapid prediction of fuel cell anode pressure drop according to claim 1, characterized in that: In step S3, the parallel flow field and the non-parallel flow field are classified according to the number of bends in the flow channel and the angles of the bends.

4. The method for rapid prediction of fuel cell anode pressure drop according to claim 1, characterized in that: In step S12, the process of comparing the detailed pressure drop values ​​of the non-parallel flow field in step S9 includes: extracting the pressure drop values ​​from the result of step 9. The value of different battery stacks The process of comparing the simplified pressure drop values ​​of the parallel flow field based on step 10 includes: obtaining the two stacks from step 2. Value, direct comparison The larger the value, the greater the pressure drop loss; the detailed pressure drop value comparison process of the parallel flow field based on step S11 includes: extracting from the result of step 11 The value of different battery stacks By comparison, the larger the value, the greater the pressure drop loss.

5. A rapid prediction system for fuel cell anode pressure drop, characterized in that: include: A parameter acquisition module, used to obtain the flow field structure parameters of the fuel cell stack; An index factor calculation module, configured to calculate an index factor number for measuring anode pressure drop loss of a fuel cell stack according to the flow field structure parameters; The flow channel structure judgment module is used to judge the flow channel structure type of the flow field plate. If it is a parallel flow field structure, it directly enters the calculation process of the pressure drop prediction module. If it is a non-parallel flow field structure, it enters the processing of the bend structure parameter acquisition module; The module for obtaining the structural parameters of the bend angle is used to obtain the structural parameters of the flow channel bend angle in the case of non-parallel flow field; The bend pressure drop factor calculation module is used to calculate the index factor for measuring the pressure drop loss caused by the bend in the anode flow channel of the fuel cell stack based on the bend structural parameters. Number and index factor number; An operating condition parameter acquisition module is used to obtain parameters related to the operating condition of the fuel cell stack; A physical property parameter acquisition module is used to obtain the physical property parameters of the working fluid on the anode side of the fuel cell stack; Auxiliary variable calculation module, used to calculate index factors based on operating parameters and physical parameters Auxiliary intermediate variables of numbers and indicator factors Auxiliary intermediate variables of numbers ; Non-parallel flow field pressure drop calculation module is used to calculate the pressure drop of the non-parallel flow field according to the auxiliary intermediate variables. 、 and indicator factors number, Calculate the pressure drop value of the anode flow channel of the fuel cell; The parallel flow field pressure drop judgment module is used to judge whether pressure drop prediction calculation is needed when the flow channel has a parallel flow field structure, and execute the corresponding calculation process according to the judgment result; Parallel flow field pressure drop calculation module, used to measure the index factor of pressure drop loss caused by straight flow channel Numbers and auxiliary intermediate variables Calculate the pressure drop in parallel flow channels; The pressure drop performance evaluation module is used to compare the pressure drop values ​​of the anode flow channel of the fuel cell stack to evaluate the pressure drop performance of different fuel cell stack structures under various operating conditions.

Images