A method, device, vehicle and medium for detecting uniformity of flow field of fuel cell

Abstract

The present invention relates to a method, device, vehicle, and medium for detecting the flow field uniformity of a fuel cell. The method comprises: gridding the flow channel geometry data of a single-plate battery to determine multiple flow channels; determining single-channel data for each of the flow channel geometry data; determining single-plate flow field data for the single-plate battery based on the single-channel data; determining single-plate resistance based on the single-channel data and the entire stack model data when the single-plate flow field data satisfies flow field uniformity requirements; and determining entire stack flow field data based on the single-channel data and the entire stack model data. Embodiments of the present invention can improve the detection accuracy of flow field uniformity for single-plate batteries and fuel cells after stacking.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel cells, and in particular to a method for detecting uniformity of a fuel cell flow field, a device for detecting uniformity of a fuel cell flow field, a vehicle, and a storage medium. Background Art

[0002] A fuel cell is an energy conversion device that directly converts the chemical energy of a fuel and an oxidant into electrical energy. The uniformity of a fuel cell's flow field is crucial to its performance. However, current fuel cell testing only focuses on the flow paths of a single plate, or simply uses the flow paths of a single plate to assess the flow field uniformity of the entire stack. These methods make it difficult to accurately assess flow uniformity within a single plate and across the entire stack, and they also prevent comprehensive control from the single plate to the entire stack. Summary of the Invention

[0003] One of the purposes of the present invention is to provide a method for detecting the uniformity of a fuel cell flow field to solve the problem in the prior art that it is difficult to accurately evaluate the uniformity of the flow of a single plate and the entire stack; a second purpose is to provide a fuel cell flow field uniformity detection device; a third purpose is to provide a vehicle; and a fourth purpose is to provide a computer-readable storage medium.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0005] In a first aspect of the present invention, an embodiment of the present invention discloses a method for detecting flow field uniformity of a fuel cell, wherein the fuel cell is formed by a stack of single-plate cells, and the stack corresponds to model data of the stack, and the method includes:

[0006] Meshing the flow channel geometric data of the single-plate battery to determine a plurality of flow channels;

[0007] Determining single flow channel data for the flow channel geometry data of each of the flow channels;

[0008] Determining single-plate flow field data of the single-plate battery based on the single-flow channel data;

[0009] When the single plate flow field data satisfies flow field uniformity, determining the single plate resistance based on the single flow channel data and the entire stack model data;

[0010] The whole stack flow field data is determined based on the single plate resistance and the whole stack model data.

[0011] Furthermore, the step of determining single flow channel data for the flow channel geometry data of each flow channel includes:

[0012] A simulation is performed based on the flow channel geometric data to determine the flow channel inlet pressure, flow channel outlet pressure and flow channel flow.

[0013] Furthermore, the step of determining the single-plate flow field data of the single-plate battery based on the single-flow channel data includes:

[0014] Determining a single flow channel pressure difference based on a flow channel inlet pressure and a flow channel outlet pressure of each of the flow channels;

[0015] Determining a first flow ratio of a flow rate of each of the flow channels to a preset total flow rate of the single board;

[0016] Single-plate flow field data is determined based on the single-channel pressure difference and the first flow ratio.

[0017] Furthermore, the method further comprises:

[0018] Calculating a first pressure difference average value of single-flow-channel pressure differences of the plurality of flow channels;

[0019] calculating a first deviation value between first flow ratios of a plurality of the flow channels;

[0020] When the first pressure difference average value is smaller than a preset first pressure difference threshold, and the first deviation value is smaller than a preset first deviation threshold, it is determined that the single plate flow field data satisfies flow field uniformity.

[0021] Furthermore, the step of determining the single plate resistance based on the single flow channel data and the whole stack model data includes:

[0022] Determining a flow field characteristic curve based on the single flow channel pressure difference and a preset single plate total flow rate;

[0023] Determine the flow field characteristic curve and determine the single plate pressure value;

[0024] The single board resistance is determined by combining the whole stack model data and the single board pressure value.

[0025] Furthermore, the step of determining the single board resistance by combining the whole stack model data and the single board pressure value includes:

[0026] Determine the equivalent resistance of the single plate pressure value in the whole stack model corresponding to the whole stack model data;

[0027] The equivalent resistance is determined to be the single plate resistance.

[0028] Furthermore, the step of determining the flow field data of the entire stack based on the single plate resistance and the entire stack model data includes:

[0029] Performing grid division based on the entire stack model data to determine a single plate area;

[0030] Perform simulation based on each of the single plate areas and the single plate resistance to determine the single plate inlet pressure, single plate outlet pressure, and single plate flow rate;

[0031] Determine the single board inlet pressure and the single board outlet pressure of each single board area, and determine the single board pressure difference;

[0032] Determine a second flow ratio of a single board flow rate of each of the single board areas to a preset total flow rate of the entire stack;

[0033] Based on the single plate pressure difference and the second flow ratio, the flow field data of the entire stack is determined.

[0034] Furthermore, the method further comprises:

[0035] Calculating a second pressure difference average value of single board pressure differences of a plurality of single board regions;

[0036] Calculating a second deviation value between the second flow ratios of the plurality of single board regions;

[0037] When the second pressure difference average value is smaller than a preset second pressure difference threshold, and the second deviation value is smaller than a preset second deviation threshold, it is determined that the entire stack flow field data satisfies flow field uniformity.

[0038] Furthermore, the whole stack model corresponding to the whole stack model data is: a flat plate structure is connected between the gas inlet and the gas outlet, and the reaction core area of ​​the flat plate structure is a porous medium area.

[0039] In a second aspect of the present invention, an embodiment of the present invention discloses a device for detecting flow field uniformity of a fuel cell, wherein the fuel cell is formed by a stack of single-plate cells, and the stack corresponds to model data of the stack, and the device includes:

[0040] A partitioning module, configured to perform grid division on the flow channel geometric data of the single-plate battery to determine a plurality of flow channels;

[0041] a single flow channel calculation module, configured to determine single flow channel data for each flow channel geometry data;

[0042] A single-plate flow field detection module, configured to determine single-plate flow field data of the single-plate battery based on the single flow channel data;

[0043] a resistance calculation module, configured to determine the single plate resistance based on the single flow channel data and the entire stack model data when the single plate flow field data satisfies flow field uniformity;

[0044] The whole stack detection module is used to determine the whole stack flow field data based on the single plate resistance and the whole stack model data.

[0045] In the third aspect of the present invention, an embodiment of the present invention discloses a vehicle, including a processor, a memory, and a computer program stored in the memory and capable of running on the processor, wherein the computer program, when executed by the processor, implements the steps of the fuel cell flow field uniformity detection method as described above.

[0046] In a fourth aspect of the present invention, an embodiment of the present invention discloses a computer-readable storage medium, characterized in that a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the steps of the fuel cell flow field uniformity detection method as described above are implemented.

[0047] Beneficial effects of the present invention:

[0048] (1) The present invention determines a plurality of flow channels by meshing the flow channel geometry data of a single-plate battery; determines single flow channel data for the flow channel geometry data of each of the flow channels; determines the single-plate flow field data of the single-plate battery based on the single flow channel data; and determines the flow field uniformity based on the flow field conditions of each flow channel by meshing the single-plate battery, thereby ensuring the calculation accuracy of the flow field uniformity of the single-plate battery.

[0049] (2) After the flow field of the single-plate battery is determined by detection, the present invention determines the single-plate resistance of the single-plate battery in the whole stack based on the flow field of the single-plate battery, and combines the single-plate resistance and the whole stack model data to determine the uniformity of the flow field of the whole stack, thereby achieving full process control from the single plate to the whole stack, and uses the single-plate resistance and the whole stack model data for calculation, taking into account the influence of the single-plate battery on the flow in the whole stack, so that the uniformity calculation of the whole stack battery is more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 A flowchart of an embodiment of a method for detecting flow field uniformity of a fuel cell according to the present invention;

[0051] Figure 2 A flowchart of another embodiment of a method for detecting flow field uniformity of a fuel cell according to the present invention;

[0052] Figure 3 A simplified schematic diagram of a single-chip battery of the present invention;

[0053] Figure 4 This is a simplified schematic diagram of a whole stack model of the present invention;

[0054] Figure 5 A schematic diagram of grid division according to the present invention;

[0055] Figure 6 A flowchart illustrating the steps of a method for detecting flow field uniformity of a fuel cell according to the present invention;

[0056] Figure 7 Schematic diagram of flow field characteristics of a single-plate battery of the present invention;

[0057] Figure 8 A schematic diagram of deviation of a whole stack of batteries according to the present invention;

[0058] Figure 9 This is a structural block diagram of an embodiment of a fuel cell flow field uniformity detection device of the present invention;

[0059] Figure 10 is a structural block diagram of a vehicle embodiment of the present invention;

[0060] Figure 11 This is a structural block diagram of an embodiment of a computer-readable storage medium of the present invention. DETAILED DESCRIPTION

[0061] The following describes the embodiments of the present invention with reference to the accompanying drawings and preferred embodiments. Those skilled in the art will readily appreciate the other advantages and benefits of the present invention from the disclosure herein. The present invention may also be implemented or applied through various other specific embodiments, and the various details in this specification may be modified or altered based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are intended only to illustrate the present invention and are not intended to limit the scope of protection of the present invention.

[0062] It should be noted that the illustrations provided in the following embodiments are merely schematic illustrations of the basic concept of the present invention. Therefore, the illustrations only show components related to the present invention and are not drawn according to the number, shape, and size of components in actual implementation. In actual implementation, the type, quantity, and proportion of each component may be changed arbitrarily, and the component layout may also be more complex.

[0063] Reference Figure 1, shows a flowchart of the steps of an embodiment of a fuel cell flow field uniformity testing method according to the present invention. The fuel cell is formed by a stack of single-plate cells, and the stack corresponds to stack model data. A fuel cell (FC) is an energy conversion device that directly converts the chemical energy of a fuel (such as hydrogen, methanol, natural gas, etc.) and an oxidant (usually oxygen or air) into electrical energy. Its operation is based on electrochemical reactions. The fuel cell is formed by stacking the single-plate cells based on the stack model data. The stack model data is determined by the fuel cell stack model. The fuel cell stack model is used to characterize the connection configuration of the single-plate cells. The core structure of each single-plate cell consists of an anode (negative electrode), a cathode (positive electrode), and an electrolyte membrane. Taking hydrogen as an example, the operating process can be divided into the following steps: Fuel supply: Hydrogen or other fuel is delivered to the anode. Oxidation reaction: Under the action of the anode catalyst, the fuel molecules undergo oxidation, releasing electrons and generating ions (such as hydrogen ions). Electron conduction: Electrons flow through an external circuit to the cathode, generating current, which drives the load. Ion conduction: Ions migrate through the electrolyte membrane to the cathode. Reduction reaction: Under the action of the cathode catalyst, ions react with oxidants (such as oxygen) to produce products such as water or carbon dioxide.

[0064] The fuel cell flow field uniformity detection method comprises:

[0065] Step 101, meshing the flow channel geometry data of the single-plate battery to determine a plurality of flow channels;

[0066] The flow channel geometry data of a single-board battery can be obtained. This flow channel geometry data includes the flow channel data of hydrogen, air, coolant, etc. The single-board battery can be meshed based on the flow channel geometry data, and each mesh is defined as a flow field, thereby dividing the entire single-board battery into multiple flow channels.

[0067] Step 102, determining single flow channel data for each flow channel geometry data;

[0068] For each flow channel, the flow channel geometry data of the flow channel is simulated to determine the single flow channel data. The single flow channel data is used to characterize the flow field characteristics of the single flow channel in the single-plate battery.

[0069] Step 103, determining single-plate flow field data of the single-plate battery based on the single-flow channel data;

[0070] The flow field uniformity of the single-plate battery is determined based on the single-channel data of each channel, and the single-plate flow field data of the single-plate battery is obtained.

[0071] Step 104 , determining the single plate resistance based on the single flow channel data and the entire stack model data when the single plate flow field data satisfies flow field uniformity;

[0072] When the single plate flow field data satisfies the flow field uniformity, the uniformity of the fuel cell stack can be determined based on the single plate battery, and the single plate resistance can be determined based on the single flow channel data and the whole stack model data.

[0073] Step 105 : determining the flow field data of the entire stack based on the single plate resistance and the entire stack model data.

[0074] The flow field inside the fuel cell is calculated using the single plate resistance and the whole stack model data to determine the flow field data for the whole stack. The flow field data for the whole stack is used to characterize the flow field uniformity inside the fuel cell after the whole stack is assembled.

[0075] In an embodiment of the present invention, the flow channel geometry data of a single-cell battery is gridded to determine multiple flow channels; single-channel data is determined for each of the flow channel geometry data; single-cell flow field data for the single-cell battery is determined based on the single-channel data; and when the single-cell flow field data satisfies flow field uniformity, single-cell resistance is determined based on the single-channel data and the entire stack model data; and flow field data for the entire stack is determined based on the single-cell resistance and the entire stack model data. By gridding the single-cell battery, flow field uniformity is determined based on the flow field conditions of each flow channel, ensuring the accuracy of flow field uniformity calculations for the single-cell battery. After detecting and determining the flow field of the single-cell battery, the single-cell resistance within the entire stack is determined based on the single-cell battery flow field. The flow field uniformity of the entire stack is determined by combining the single-cell resistance and the entire stack model data, thereby achieving full control from the single-cell battery to the entire stack. Calculations using the single-cell resistance and the entire stack model data take into account the impact of the single-cell battery on flow throughout the stack, resulting in more accurate uniformity calculations for the entire stack.

[0076] Reference Figure 2 , shows a flowchart of another embodiment of a fuel cell flow field uniformity detection method of the present invention, wherein the fuel cell is formed by a single-plate battery stack, and the stack corresponds to a stack model data. The stack model corresponding to the stack model data is: a flat plate structure is connected between the gas inlet and the gas outlet, and the reaction core area of ​​the flat plate structure is a porous medium area. Figure 3 In the single-plate battery structure of the whole stack, the reaction core area is selected as the porous medium area. The complex single-plate structure is simplified into a flat plate structure, and the core reaction area is separated. Internal connection surfaces A1 and A2 are established with the upstream and downstream to transmit flow field information. The areas of A1 and A2 are equal. The whole stack model is as follows Figure 4 , each single-plate battery is connected in parallel between the inlet and the outlet.

[0077] Step 201, meshing the flow channel geometry data of the single-plate battery to determine a plurality of flow channels;

[0078] First, the flow channel geometry data of the single-plate battery can be used for grid division to determine multiple flow channels. Since the size of the flow channel geometry data is relatively fine, it is required that deformation and distortion cannot occur to ensure that it matches the actual structure, so that the calculation simulation can be performed more accurately. Moreover, the grid division can be based on the investigated electrical density range to set the mass flow rate of each medium of the single plate (taking the air cavity as an example) and physical parameters. Since the pressure in the gas cavity is in the range of 1~3bar during the operation of the battery stack, and there is a large pressure loss when flowing through the narrow flow channel, the gas is compressed and expanded, and you can refer to Figure 5 , divided based on compression characteristics.

[0079] Step 202, determining single flow channel data for the flow channel geometry data of each flow channel;

[0080] Perform fluid simulation on the geometry of each flow channel to determine the single flow channel data. Calculate the flow field of the single-plate battery from each flow channel, making the process of determining the flow field uniformity more intuitive.

[0081] In an optional embodiment of the present invention, the step of determining single flow channel data for the flow channel geometry data of each of the flow channels includes: performing simulation based on the flow channel geometry data to determine the flow channel inlet pressure, flow channel outlet pressure and flow channel flow.

[0082] Based on the flow channel geometry data, a flow field simulation model can be established using a grid for simulation. Based on the established flow field simulation model, the flow velocity and pressure distribution of the gas in the flow channel can be obtained, while the total input flow rate is determined. The flow channel inlet pressure, flow channel outlet pressure, and flow channel flow rate can be obtained. Software used for simulation includes, but is not limited to, ANSYS Fluent and COMSOL Multiphysics.

[0083] Step 203, determining single-plate flow field data of the single-plate battery based on the single-flow channel data;

[0084] The single-plate flow field data of the single-plate battery are determined in combination with the single-channel data of each channel, so that the flow field of the single-plate battery can be accurately determined.

[0085] In an optional embodiment of the present invention, the step of determining the single-plate flow field data of the single-plate battery based on the single-flow channel data includes:

[0086] Sub-step S2031, determining a single flow channel pressure difference based on the flow channel inlet pressure and the flow channel outlet pressure of each flow channel;

[0087] The pressure difference between the gas inlet and outlet of each flow channel is calculated by subtracting the pressure of the flow channel inlet and outlet of each flow channel to determine the pressure difference of the single flow channel.

[0088] Sub-step S2032, determining a first flow ratio of the flow rate of each of the flow channels to a preset total flow rate of the single board;

[0089] The ratio between the flow rate of each flow channel and the preset total flow rate of the single board is determined to obtain a first flow rate ratio. The preset total flow rate of the single board can be determined according to actual conditions and is not specifically limited in the embodiment of the present invention.

[0090] Sub-step S2033: determining single-plate flow field data based on the single-channel pressure difference and the first flow ratio.

[0091] The single-channel pressure difference and the first flow ratio are used to determine the single-plate flow field data.

[0092] Step 204, calculating a first pressure difference average value of single-flow-channel pressure differences of the plurality of flow channels;

[0093] The average value of the single-channel pressure differences of the plurality of channels may be calculated, that is, a first average pressure difference value may be obtained.

[0094] Step 205, calculating a first deviation value between first flow ratios of a plurality of the flow channels;

[0095] A deviation value between the first flow rate ratios of the plurality of flow channels, ie, a first deviation value, may also be calculated.

[0096] Step 206: When the first pressure difference average value is less than a preset first pressure difference threshold, and the first deviation value is less than a preset first deviation threshold, determining that the single plate flow field data satisfies flow field uniformity;

[0097] If the average first pressure difference value is less than the preset first pressure difference threshold, and the first deviation value is less than the preset first deviation threshold, it indicates that the flow field uniformity of the single-plate battery meets the requirements, and the single-plate flow field data is determined to meet the flow field uniformity. If the average first pressure difference value is not less than the preset first pressure difference threshold, or the first deviation value is not less than the preset first deviation threshold, it indicates that the flow field of the single-plate battery is poor, and the flow path of the single-plate battery needs to be optimized until the flow field uniformity is met.

[0098] Step 207 , determining the single plate resistance based on the single flow channel data and the entire stack model data when the single plate flow field data satisfies flow field uniformity;

[0099] When the single-plate flow field data satisfies the flow field uniformity, the uniformity test of the entire battery stack can be carried out, and the single-plate resistance of the single-plate battery can be determined based on the single flow channel data and the entire stack model data.

[0100] In an optional embodiment of the present invention, the step of determining the single plate resistance based on the single flow channel data and the entire stack model data includes:

[0101] Sub-step S2071, determining a flow field characteristic curve based on the single flow channel pressure difference and a preset single plate total flow rate;

[0102] First, simulations can be performed based on multiple sets of single-channel pressure differentials at different preset total single-board flow rates to determine the flow field characteristic curve for each battery cell. To ensure accuracy, simulations must be performed using at least four sets of single-channel pressure differentials at different preset total single-board flow rates to ensure that the flow field characteristic curve meets actual requirements. The total flow rate range, calculated by multiplying the four different preset total single-board flow rates by the number of cells, covers the flow rate for the entire stack under analysis.

[0103] Sub-step S2072, determining the flow field characteristic curve and determining the single plate pressure value;

[0104] The single plate pressure value can be determined based on the rate of change in the flow field characteristic curve.

[0105] Sub-step S2073 , determining the single board resistance by combining the entire stack model data and the single board pressure value.

[0106] The whole stack model data and the single plate pressure value are fitted together to determine the single plate resistance of the single plate battery in the whole stack model.

[0107] Furthermore, the step of determining the single plate resistance by combining the whole stack model data and the single plate pressure value includes: determining the equivalent resistance of the single plate pressure value in the whole stack model corresponding to the whole stack model data; and determining the equivalent resistance as the single plate resistance.

[0108] To determine the single plate resistance, the equivalent resistance of the single plate pressure value in the whole stack model corresponding to the whole stack model data may be determined, and the single plate resistance may be determined based on the obtained equivalent resistance.

[0109] Step 208 : determining the flow field data of the entire stack based on the single plate resistance and the entire stack model data.

[0110] The flow field data of the entire stack can be determined by simulation using single plate resistance and entire stack model data.

[0111] In an optional embodiment of the present invention, the step of determining the flow field data of the entire stack based on the single plate resistance and the entire stack model data includes:

[0112] Sub-step S2081, performing grid division based on the entire stack model data to determine the single plate area;

[0113] Similar to the simulation of single-panel batteries, grid division can be performed based on the entire stack model data to determine different single-panel areas.

[0114] Sub-step S2082, performing simulation based on each of the single board areas and the single board resistance to determine the single board inlet pressure, single board outlet pressure, and single board flow rate;

[0115] Based on each single plate area and the single plate resistance obtained by fitting, a simulation is performed under a preset total flow rate to determine the single plate inlet pressure, single plate outlet pressure and single plate flow rate of each single plate area.

[0116] Sub-step S2083, determining the single board inlet pressure and the single board outlet pressure of each single board area, and determining the single board pressure difference;

[0117] The pressure difference between the inlet and outlet of each board area is determined based on the board inlet pressure and the board outlet pressure of each board area to obtain a board pressure difference value.

[0118] Sub-step S2084, determining a second flow ratio of the single board flow of each of the single board areas to a preset total flow of the entire stack;

[0119] Then, the ratio between the single board flow rate of each single board area and the preset total flow rate of the entire stack is determined to obtain a second flow rate ratio. The preset total flow rate of the entire stack can be determined according to demand and is not specifically limited in the embodiment of the present invention.

[0120] Sub-step S2085 , determining the flow field data of the entire stack based on the single plate pressure difference and the second flow ratio.

[0121] The flow field data of the entire stack is determined based on the single plate pressure difference and the second flow ratio, and the flow field data of the entire stack is characterized based on the flow field data of the entire stack.

[0122] Furthermore, the flow field uniformity of the entire stack of batteries can be determined based on the single-plate flow field data. A second pressure difference average value of the single-plate pressure difference values ​​of multiple single-plate regions is calculated; a second deviation value between the second flow rate ratios of multiple single-plate regions is calculated; and when the second pressure difference average value is less than a preset second pressure difference threshold, and the second deviation value is less than a preset second deviation threshold, the flow field data for the entire stack is determined to meet flow field uniformity.

[0123] The average value of the single-board pressure difference of each single-board area, i.e., the second pressure difference average value, can be calculated. The deviation value between the second flow ratios of each single-board area is calculated to obtain the second deviation value. When the second pressure difference average value is less than the preset second pressure difference threshold, and the second deviation value is less than the preset second deviation threshold, it is determined that the flow field data of the entire stack meets the flow field uniformity and the entire stack of batteries can be used. When the second pressure difference average value is not less than the preset second pressure difference threshold, or the second deviation value is not less than the preset second deviation threshold, it indicates that the entire stack of batteries needs to be optimized so that it meets the flow field uniformity requirements.

[0124] The present invention determines multiple flow channels by gridding the flow channel geometry data of a single-plate battery; determines single flow channel data for the flow channel geometry data of each flow channel; determines the single-plate flow field data of the single-plate battery based on the single flow channel data; and determines the flow field uniformity based on the flow field conditions of each flow channel by gridding the single-plate battery, thereby ensuring the accuracy of the calculation of the flow field uniformity of the single-plate battery. After determining the flow field of the single-plate battery by detection, the single-plate resistance of the single-plate battery in the entire stack is determined based on the flow field of the single-plate battery, and the flow field uniformity of the entire stack is determined in combination with the single-plate resistance and the entire stack model data, thereby achieving full process control from the single plate to the entire stack, and using the single-plate resistance and the entire stack model data for calculation, taking into account the influence of the single-plate battery on the flow in the entire stack, so that the uniformity calculation of the entire stack of batteries is more accurate.

[0125] In order to make the implementation process of the embodiment of the present invention clear to those skilled in the art, an example is used below for illustration:

[0126] You can refer to Figure 6 , which shows a flowchart of an example of a method for detecting uniformity of a fuel cell flow field according to the present invention,

[0127] S1. Obtain flow path geometry data. Starting from a single cell, obtain detailed flow path geometry data of hydrogen, air, and coolant in the cell.

[0128] S2. Grid division and establishment of a flow field simulation model. Based on the extracted flow channel geometry data, grid division is performed to establish a flow field simulation model. The flow field simulation model then calculates the flow velocity, pressure, and other distributions within each flow channel.

[0129] S3, extract the single plate flow field parameters. Extract the first average pressure difference of the single plate flow channel , which is the average value of the pressure difference between each single channel. The pressure difference between each single channel is: , is the flow channel inlet pressure, is the outlet pressure of the flow channel. Extract the total mass flow rate M of the single plate and the mass flow rate of each flow channel (n is the number of runners).

[0130] S4. Determine whether the single board design requirements are met: the average value of the first pressure difference ( is the preset first pressure difference threshold), and uniformity ,in, is the average mass flow rate of all flow channels, is the first deviation value, which is ≤5%. If the above conditions are met, the board is determined to meet the design requirements, otherwise continue to optimize the board flow channel, such as Figure 7 .

[0131] S5. Establish a simplified model of the entire stack. When the single plate is optimized to meet the requirements, select at least 4 groups of mass flow rates of different sizes, and calculate the inlet and outlet pressure differences under at least 4 groups of different mass flow rates. The total flow range obtained by multiplying the set single plate mass flow rate and the number of plates is required to cover the flow rate of the entire stack analysis condition. Simplify the single plate structure in the entire stack, and select the reaction core area as the porous medium area. Divide the grid for the entire stack of batteries, and select the appropriate grid size according to the size of the single plate. Since the geometry is relatively simple after simplification, the grid is divided into layers, and the generated grid has at least three layers. The connection between the single plate and the main pipe is meshed, and the core reaction area is replaced as a porous medium model. Convert the relationship between the 4 different pressure differences and mass flow rates into a quadratic equation of pressure difference and average equivalent flow velocity v. As follows:

[0132] ,in, , is the average flow velocity at position A1, is the average flow velocity at position A2, positions A1 and A2 are simplified internal positions of the single plate structure in the entire stack, L is the length along the core area, is the inertial resistance coefficient of the single board resistance, is the viscous drag coefficient of the single plate. and The single plate resistance is calculated by loading it into the entire porous media model.

[0133] S6. Determine the uniformity of the flow field of the entire stack. Calculate the flow field of the entire stack based on the target preset total flow rate, and analyze the pressure difference of the single plate of the entire stack inlet and outlet pressures. And the flow rate of each battery:

[0134] (k is the number of cells). Evaluate the pressure difference and flow distribution uniformity ,like Figure 8 .

[0135] when When , the pressure difference meets the requirements;

[0136] in, is the second pressure difference threshold. When , the uniformity of the flow field of the whole stack meets the requirements, among which, is the average mass flow rate of the entire battery stack, is the second deviation value, which is 5%.

[0137] S7. Satisfy flow field performance indicators. If both are satisfied, the entire battery stack is determined to meet the flow field uniformity requirements; otherwise, continue optimization.

[0138] Reference Figure 9 , shows a structural block diagram of an embodiment of a fuel cell flow field uniformity detection device of the present invention, wherein the fuel cell is formed by a stack of single-plate cells, and the stack corresponds to the stack model data. The device includes:

[0139] A division module 901 is used to perform grid division on the flow channel geometric data of the single-plate battery to determine a plurality of flow channels;

[0140] A single flow channel calculation module 902 is configured to determine single flow channel data for each flow channel geometry data;

[0141] A single-board flow field detection module 903 is configured to determine single-board flow field data of the single-board battery based on the single flow channel data;

[0142] a resistance calculation module 904 for determining the resistance of a single plate based on the single flow channel data and the whole stack model data when the single plate flow field data satisfies flow field uniformity;

[0143] The whole stack detection module 905 is configured to determine the whole stack flow field data based on the single plate resistance and the whole stack model data.

[0144] In an optional embodiment of the present invention, the single flow channel calculation module 902 includes:

[0145] The first simulation submodule is used to perform simulation based on the flow channel geometric data to determine the flow channel inlet pressure, flow channel outlet pressure and flow channel flow.

[0146] In an optional embodiment of the present invention, the single board flow field detection module 903 includes:

[0147] a first pressure difference calculation submodule, configured to determine a single flow channel pressure difference based on a flow channel inlet pressure and a flow channel outlet pressure of each of the flow channels;

[0148] A first flow ratio calculation submodule, configured to determine a first flow ratio of a flow channel flow rate of each of the flow channels to a preset total flow rate of a single board;

[0149] The single plate flow field data calculation submodule is used to determine the single plate flow field data based on the single flow channel pressure difference and the first flow ratio.

[0150] In an optional embodiment of the present invention, the device further comprises:

[0151] A first pressure difference average calculation module, configured to calculate a first pressure difference average value of single-flow-channel pressure differences of the plurality of flow channels;

[0152] A first deviation value module, configured to calculate a first deviation value between first flow ratios of a plurality of the flow channels;

[0153] The single plate flow field uniformity determination module is used to determine that the single plate flow field data meets the flow field uniformity when the first pressure difference average value is less than a preset first pressure difference threshold and the first deviation value is less than a preset first deviation threshold.

[0154] In an optional embodiment of the present invention, the resistance calculation module 904 includes:

[0155] A flow field characteristic curve determination submodule, configured to determine a flow field characteristic curve based on the single flow channel pressure difference and a preset single plate total flow rate;

[0156] A single plate pressure value determination submodule is used to determine the flow field characteristic curve and determine the single plate pressure value;

[0157] The single board resistance determination submodule is used to determine the single board resistance by combining the whole stack model data and the single board pressure value.

[0158] In an optional embodiment of the present invention, the single board resistance determination submodule includes:

[0159] An equivalent unit, used to determine the equivalent resistance of the single plate pressure value in the whole stack model corresponding to the whole stack model data;

[0160] The single board resistance determining unit is configured to determine the equivalent resistance as the single board resistance.

[0161] In an optional embodiment of the present invention, the whole stack detection module 905 includes:

[0162] A grid division submodule, configured to perform grid division based on the entire stack model data to determine a single plate area;

[0163] A second simulation submodule is configured to perform simulation based on each of the single board areas and the single board resistance to determine a single board inlet pressure, a single board outlet pressure, and a single board flow rate;

[0164] A single board pressure difference calculation submodule is used to determine the single board inlet pressure and the single board outlet pressure of each single board area, and determine the single board pressure difference;

[0165] A second flow ratio calculation submodule, configured to determine a second flow ratio of a single board flow in each of the single board areas to a preset total flow of the entire stack;

[0166] The single plate flow field data calculation submodule is used to determine the flow field data of the entire stack based on the single plate pressure difference and the second flow ratio.

[0167] In an optional embodiment of the present invention, the device further comprises:

[0168] A second pressure difference average value calculation module is used to calculate a second pressure difference average value of the single board pressure differences of the plurality of single board areas;

[0169] A second deviation value calculation module, configured to calculate a second deviation value between the second flow ratios of the plurality of single board regions;

[0170] The whole stack flow field uniformity determination module is used to determine that the whole stack flow field data meets the flow field uniformity when the second pressure difference average value is less than a preset second pressure difference threshold and the second deviation value is less than a preset second deviation threshold.

[0171] In an optional embodiment of the present invention, the whole stack model corresponding to the whole stack model data is: a flat plate structure is connected between the gas inlet and the gas outlet, and the reaction core area of ​​the flat plate structure is a porous medium area.

[0172] Reference Figure 10 , an embodiment of the present invention further provides a vehicle, comprising:

[0173] A processor 1001 and a storage medium 1002, wherein the storage medium 1002 stores a computer program executable by the processor 1001. When the vehicle is running, the processor 1001 executes the computer program to perform the fuel cell flow field uniformity detection method as described in any one of the embodiments of the present invention. The fuel cell is formed by a stack of single-plate cells, and the stack corresponds to the entire stack model data. The fuel cell flow field uniformity detection method includes:

[0174] Meshing the flow channel geometric data of the single-plate battery to determine a plurality of flow channels;

[0175] Determining single flow channel data for the flow channel geometry data of each of the flow channels;

[0176] Determining single-plate flow field data of the single-plate battery based on the single-flow channel data;

[0177] When the single plate flow field data satisfies flow field uniformity, determining the single plate resistance based on the single flow channel data and the entire stack model data;

[0178] The whole stack flow field data is determined based on the single plate resistance and the whole stack model data.

[0179] Furthermore, the step of determining single flow channel data for the flow channel geometry data of each flow channel includes:

[0180] A simulation is performed based on the flow channel geometric data to determine the flow channel inlet pressure, flow channel outlet pressure and flow channel flow.

[0181] Furthermore, the step of determining the single-plate flow field data of the single-plate battery based on the single-flow channel data includes:

[0182] Determining a single flow channel pressure difference based on a flow channel inlet pressure and a flow channel outlet pressure of each of the flow channels;

[0183] Determining a first flow ratio of a flow rate of each of the flow channels to a preset total flow rate of the single board;

[0184] Single-plate flow field data is determined based on the single-channel pressure difference and the first flow ratio.

[0185] Furthermore, the method further comprises:

[0186] Calculating a first pressure difference average value of single-flow-channel pressure differences of the plurality of flow channels;

[0187] calculating a first deviation value between first flow ratios of a plurality of the flow channels;

[0188] When the first pressure difference average value is smaller than a preset first pressure difference threshold, and the first deviation value is smaller than a preset first deviation threshold, it is determined that the single plate flow field data satisfies flow field uniformity.

[0189] Furthermore, the step of determining the single plate resistance based on the single flow channel data and the whole stack model data includes:

[0190] Determining a flow field characteristic curve based on the single flow channel pressure difference and a preset single plate total flow rate;

[0191] Determine the flow field characteristic curve and determine the single plate pressure value;

[0192] The single board resistance is determined by combining the whole stack model data and the single board pressure value.

[0193] Furthermore, the step of determining the single board resistance by combining the whole stack model data and the single board pressure value includes:

[0194] Determine the equivalent resistance of the single plate pressure value in the whole stack model corresponding to the whole stack model data;

[0195] The equivalent resistance is determined to be the single plate resistance.

[0196] Furthermore, the step of determining the flow field data of the entire stack based on the single plate resistance and the entire stack model data includes:

[0197] Performing grid division based on the entire stack model data to determine a single plate area;

[0198] Perform simulation based on each of the single plate areas and the single plate resistance to determine the single plate inlet pressure, single plate outlet pressure, and single plate flow rate;

[0199] Determine the single board inlet pressure and the single board outlet pressure of each single board area, and determine the single board pressure difference;

[0200] Determine a second flow ratio of a single board flow rate of each of the single board areas to a preset total flow rate of the entire stack;

[0201] Based on the single plate pressure difference and the second flow ratio, the flow field data of the entire stack is determined.

[0202] Furthermore, the method further comprises:

[0203] Calculating a second pressure difference average value of single board pressure differences of a plurality of single board regions;

[0204] Calculating a second deviation value between the second flow ratios of the plurality of single board regions;

[0205] When the second pressure difference average value is smaller than a preset second pressure difference threshold, and the second deviation value is smaller than a preset second deviation threshold, it is determined that the entire stack flow field data satisfies flow field uniformity.

[0206] Furthermore, the whole stack model corresponding to the whole stack model data is: a flat plate structure is connected between the gas inlet and the gas outlet, and the reaction core area of ​​the flat plate structure is a porous medium area.

[0207] The memory may include a random access memory (RAM) or a non-volatile memory, such as at least one disk storage. Alternatively, the memory may be at least one storage device located away from the processor.

[0208] The above-mentioned processor can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, and discrete hardware components.

[0209] Reference Figure 11 The present invention also provides a computer-readable storage medium 1101 having a computer program stored thereon. When the computer program is executed by a processor, the method for detecting the uniformity of a fuel cell flow field is executed. The fuel cell is formed by a stack of single-plate cells, and the stack has corresponding model data. The method for detecting the uniformity of a fuel cell flow field comprises:

[0210] Meshing the flow channel geometric data of the single-plate battery to determine a plurality of flow channels;

[0211] Determining single flow channel data for the flow channel geometry data of each of the flow channels;

[0212] Determining single-plate flow field data of the single-plate battery based on the single-flow channel data;

[0213] When the single plate flow field data satisfies flow field uniformity, determining the single plate resistance based on the single flow channel data and the entire stack model data;

[0214] The whole stack flow field data is determined based on the single plate resistance and the whole stack model data.

[0215] Furthermore, the step of determining single flow channel data for the flow channel geometry data of each flow channel includes:

[0216] A simulation is performed based on the flow channel geometric data to determine the flow channel inlet pressure, flow channel outlet pressure and flow channel flow.

[0217] Furthermore, the step of determining the single-plate flow field data of the single-plate battery based on the single-flow channel data includes:

[0218] Determining a single flow channel pressure difference based on a flow channel inlet pressure and a flow channel outlet pressure of each of the flow channels;

[0219] Determining a first flow ratio of a flow rate of each of the flow channels to a preset total flow rate of the single board;

[0220] Single-plate flow field data is determined based on the single-channel pressure difference and the first flow ratio.

[0221] Furthermore, the method further comprises:

[0222] Calculating a first pressure difference average value of single-flow-channel pressure differences of the plurality of flow channels;

[0223] calculating a first deviation value between first flow ratios of a plurality of the flow channels;

[0224] When the first pressure difference average value is smaller than a preset first pressure difference threshold, and the first deviation value is smaller than a preset first deviation threshold, it is determined that the single plate flow field data satisfies flow field uniformity.

[0225] Furthermore, the step of determining the single plate resistance based on the single flow channel data and the whole stack model data includes:

[0226] Determining a flow field characteristic curve based on the single flow channel pressure difference and a preset single plate total flow rate;

[0227] Determine the flow field characteristic curve and determine the single plate pressure value;

[0228] The single board resistance is determined by combining the whole stack model data and the single board pressure value.

[0229] Furthermore, the step of determining the single board resistance by combining the whole stack model data and the single board pressure value includes:

[0230] Determine the equivalent resistance of the single plate pressure value in the whole stack model corresponding to the whole stack model data;

[0231] The equivalent resistance is determined to be the single plate resistance.

[0232] Furthermore, the step of determining the flow field data of the entire stack based on the single plate resistance and the entire stack model data includes:

[0233] Performing grid division based on the entire stack model data to determine a single plate area;

[0234] Perform simulation based on each of the single plate areas and the single plate resistance to determine the single plate inlet pressure, single plate outlet pressure, and single plate flow rate;

[0235] Determine the single board inlet pressure and the single board outlet pressure of each single board area, and determine the single board pressure difference;

[0236] Determine a second flow ratio of a single board flow rate of each of the single board areas to a preset total flow rate of the entire stack;

[0237] Based on the single plate pressure difference and the second flow ratio, the flow field data of the entire stack is determined.

[0238] Furthermore, the method further comprises:

[0239] Calculating a second pressure difference average value of single board pressure differences of a plurality of single board regions;

[0240] Calculating a second deviation value between the second flow ratios of the plurality of single board regions;

[0241] When the second pressure difference average value is smaller than a preset second pressure difference threshold, and the second deviation value is smaller than a preset second deviation threshold, it is determined that the entire stack flow field data satisfies flow field uniformity.

[0242] Furthermore, the whole stack model corresponding to the whole stack model data is: a flat plate structure is connected between the gas inlet and the gas outlet, and the reaction core area of ​​the flat plate structure is a porous medium area.

[0243] The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to in detail.

[0244] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, apparatus, or computer program products. Thus, embodiments of the present invention may take the form of a fully hardware embodiment, a fully software embodiment, or an embodiment combining software and hardware. Furthermore, embodiments of the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0245] The embodiments of the present invention are described with reference to the flowcharts and / or block diagrams of the methods, terminal devices (systems), and computer program products according to the embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of the processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing terminal device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing terminal device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0246] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing terminal device to operate in a specific manner, so that the instructions stored in the computer readable memory produce a manufactured product including an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0247] These computer program instructions can also be loaded onto a computer or other programmable data processing terminal device so that a series of operating steps are executed on the computer or other programmable terminal device to produce a computer-implemented process, thereby providing instructions for executing on the computer or other programmable terminal device to implement the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0248] The above embodiments are only preferred embodiments for fully illustrating the present invention, and the protection scope of the present invention is not limited thereto. Any equivalent substitution or modification made by those skilled in the art based on the present invention is within the protection scope of the present invention.

Claims

1. A method for detecting the uniformity of a fuel cell flow field, characterized in that: The fuel cell is formed by a stack of single-plate cells, the stack corresponding to which is model data of the stack, and the method includes: Meshing the flow channel geometric data of the single-plate battery to determine a plurality of flow channels; Determining single flow channel data for the flow channel geometry data of each of the flow channels; Determining single-plate flow field data of the single-plate battery based on the single-flow channel data; When the single plate flow field data satisfies flow field uniformity, determining the single plate resistance based on the single flow channel data and the entire stack model data; The whole stack flow field data is determined based on the single plate resistance and the whole stack model data.

2. The method according to claim 1, characterized in that The step of determining single flow channel data for each flow channel geometry data comprises: A simulation is performed based on the flow channel geometric data to determine the flow channel inlet pressure, flow channel outlet pressure and flow channel flow.

3. The method according to claim 2, characterized in that The step of determining the single-plate flow field data of the single-plate battery based on the single-flow channel data includes: Determining a single flow channel pressure difference based on a flow channel inlet pressure and a flow channel outlet pressure of each of the flow channels; Determining a first flow ratio of a flow rate of each of the flow channels to a preset total flow rate of the single board; Single-plate flow field data is determined based on the single-channel pressure difference and the first flow ratio.

4. The method according to claim 3, characterized in that The method further comprises: Calculating a first pressure difference average value of single-flow-channel pressure differences of the plurality of flow channels; calculating a first deviation value between first flow ratios of a plurality of the flow channels; When the first pressure difference average value is smaller than a preset first pressure difference threshold, and the first deviation value is smaller than a preset first deviation threshold, it is determined that the single plate flow field data satisfies flow field uniformity.

5. The method according to claim 3, characterized in that The step of determining the single plate resistance based on the single flow channel data and the whole stack model data includes: Determining a flow field characteristic curve based on the single flow channel pressure difference and a preset single plate total flow rate; Determine the flow field characteristic curve and determine the single plate pressure value; The single board resistance is determined by combining the whole stack model data and the single board pressure value.

6. The method according to claim 5, characterized in that The step of determining the single board resistance by combining the whole stack model data and the single board pressure value comprises: Determine the equivalent resistance of the single plate pressure value in the whole stack model corresponding to the whole stack model data; The equivalent resistance is determined to be the single plate resistance.

7. The method according to claim 1, characterized in that The step of determining the flow field data of the entire stack based on the single plate resistance and the entire stack model data comprises: Performing grid division based on the entire stack model data to determine a single plate area; Perform simulation based on each of the single plate areas and the single plate resistance to determine the single plate inlet pressure, single plate outlet pressure, and single plate flow rate; Determine the single board inlet pressure and the single board outlet pressure of each single board area, and determine the single board pressure difference; Determine a second flow ratio of a single board flow rate of each of the single board areas to a preset total flow rate of the entire stack; Based on the single plate pressure difference and the second flow ratio, the flow field data of the entire stack is determined.

8. The method according to claim 7, characterized in that The method further comprises: Calculating a second pressure difference average value of single board pressure differences of a plurality of single board regions; Calculating a second deviation value between the second flow ratios of the plurality of single board regions; When the second pressure difference average value is smaller than a preset second pressure difference threshold, and the second deviation value is smaller than a preset second deviation threshold, it is determined that the entire stack flow field data satisfies flow field uniformity.

9. The method according to any one of claims 1 to 8, characterized in that The whole stack model corresponding to the whole stack model data is: a flat plate structure is connected between the gas inlet and the gas outlet, and the reaction core area of ​​the flat plate structure is a porous medium area.

10. A fuel cell flow field uniformity detection device, characterized in that: The fuel cell is formed by a stack of single-plate cells, the stack corresponding to which is provided with model data of the stack, and the device includes: A partitioning module, configured to perform grid division on the flow channel geometric data of the single-plate battery to determine a plurality of flow channels; a single flow channel calculation module, configured to determine single flow channel data for each flow channel geometry data; A single-plate flow field detection module, configured to determine single-plate flow field data of the single-plate battery based on the single flow channel data; a resistance calculation module, configured to determine the single plate resistance based on the single flow channel data and the entire stack model data when the single plate flow field data satisfies flow field uniformity; The whole stack detection module is used to determine the whole stack flow field data based on the single plate resistance and the whole stack model data.

11. A vehicle, characterized in that: The method comprises a processor, a memory, and a computer program stored in the memory and capable of running on the processor, wherein when the computer program is executed by the processor, the steps of the method for detecting the uniformity of the flow field of a fuel cell as claimed in any one of claims 1 to 9 are implemented.

12. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the fuel cell flow field uniformity detection method according to any one of claims 1 to 9 are implemented.

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