Polar plate runner design method, polar plate runner and fuel cell

Abstract

The invention provides a polar plate runner design method, a polar plate runner and a fuel cell. The polar plate runner design method comprises the following steps: determining a size boundary parameter of a polar plate runner in a repetition period; designing a runner structure scheme in a single repetition period according to the dimension boundary parameters of the repetition period; establishing a multi-channel parallel model for each flow channel structure scheme; three-dimensional model simulation calculation is conducted on the multiple multi-channel parallel flow channel schemes, and flow channel performance parameters of all the multi-channel parallel flow channel schemes are obtained; comparing the flow channel performance parameters of the plurality of multi-channel parallel flow channel schemes to determine an optimal flow channel scheme; and determining a runner structure size parameter corresponding to the optimal runner scheme, and outputting the runner structure size parameter. According to the polar plate flow channel design method provided by the invention, the multiphase flow model under the condition of parallel connection of multiple channels is established, so that the problems of insufficient drainage performance and non-uniform gas distribution of a multi-channel flow channel system designed by an existing polar plate flow channel design method are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel cell flow channel design, and in particular to a polar plate flow channel design method, a polar plate flow channel and a fuel cell. Background Art

[0002] Fuel cells, especially proton exchange membrane fuel cells (PEMFCs), as an efficient and clean energy conversion device, show great application potential in the energy field. However, their performance and life are largely restricted by the management of liquid water in the flow channel. During the operation of the fuel cell, if the water generated by the electrochemical reaction cannot be effectively discharged, it will cause blockage of the flow channel, affect gas transmission, cause local gas shortage, and even accelerate the corrosion of the carbon carrier of the catalyst layer, ultimately leading to the attenuation of battery performance and shortened life. To solve this problem, researchers often use simulation calculation methods based on VOF (Volume of Fluid) model, hybrid model and Euler multiphase flow model to simulate the gas-liquid two-phase flow behavior in a single-channel flow channel, so as to quantitatively evaluate the drainage performance of the single-channel flow channel, aiming to optimize the flow channel structure to improve the water removal efficiency. This evaluation method usually involves key indicators such as flow channel pressure drop fluctuation, GDL (Gas Diffusion Layer) surface coverage, and liquid water volume ratio in the flow channel. However, these methods are limited in that they only consider single-channel flow channels, while ignoring the impact of liquid water distribution on gas distribution consistency when multiple channels are connected in parallel. They also fail to fully evaluate the impact of flow channel design on the matching of anode and cathode plate flow channels, resulting in the optimized flow channel possibly causing uneven gas distribution or stability problems in actual applications.

[0003] In addition, existing channel design optimization strategies often focus on the adjustment of local size and shape, while ignoring the constraints of the minimum repeating unit size boundary of the channel on the overall design. Although this local optimization method can improve the drainage performance of a single channel to a certain extent, in a multi-channel parallel system, the uneven distribution of liquid water may lead to inconsistency in gas flow distribution, thereby affecting the overall performance of the fuel cell. More importantly, if only the single-side channel is designed and optimized without considering the matching of the channels on both sides, the change in the channel overlap relationship may lead to local gas shortage or reduce the overlap stability. Therefore, the existing channel design method lacks quantitative evaluation of the drainage performance of multi-channel parallel channels, especially in terms of drainage performance and gas flow distribution consistency in a multi-channel parallel system, there are still obvious deficiencies. Summary of the invention

[0004] The main purpose of the present invention is to provide a polar plate flow channel design method, a polar plate flow channel and a fuel cell. By establishing a multiphase flow model under multi-channel parallel conditions, the drainage performance of multiple flow channels and the matching between flow channels are comprehensively evaluated and optimized, thereby solving the problem that the existing polar plate flow channel design method lacks the design and evaluation of multi-channel parallel flow channels, resulting in insufficient drainage performance and uneven gas distribution of the designed multi-channel flow channel system.

[0005] In order to achieve the above object, according to one aspect of the present invention, a method for designing a plate flow channel is provided, comprising:

[0006] Determine the dimension boundary parameters of the plate flow channel in a repetitive cycle;

[0007] Design the flow channel structure scheme within a single repetition cycle according to the repetition cycle size boundary parameters;

[0008] For each flow channel structure scheme, establish its multi-channel parallel model;

[0009] Perform three-dimensional model simulation calculations on multiple multi-channel parallel flow channel schemes to obtain flow channel performance parameters of each multi-channel parallel flow channel scheme;

[0010] Compare the flow channel performance parameters of multiple multi-channel parallel flow channel solutions to determine the optimal flow channel solution;

[0011] Determine the flow channel structure size parameters corresponding to the optimal flow channel solution and output the flow channel structure size parameters.

[0012] Furthermore, the steps of performing three-dimensional model simulation calculations on a plurality of multi-channel parallel flow channel schemes respectively to obtain flow channel performance parameters of each multi-channel parallel flow channel scheme include:

[0013] Establish a multi-channel parallel flow channel three-dimensional model for a single multi-channel parallel flow channel solution;

[0014] Perform flow simulation calculations on a three-dimensional model of multi-channel parallel flow channels based on a computational model;

[0015] Get simulation calculation results;

[0016] The flow channel performance parameters of a single multi-channel parallel flow channel solution are obtained by statistical simulation calculation results;

[0017] Repeat the above steps to obtain the flow channel performance parameters of multiple multi-channel parallel flow channel solutions.

[0018] Furthermore, the dimension boundary parameters include a repetition period T and a line spacing d between a straight line where the highest point is located and a straight line where the lowest point is located.

[0019] Furthermore, the plurality of multi-channel parallel flow channel solutions include a zigzag branch flow channel solution and an arc-shaped branch flow channel solution.

[0020] Furthermore, the simulation results include the channel pressure drop of a single channel in the multi-channel parallel channel three-dimensional model, the GDL surface coverage, the liquid water volume fraction in the channel, and the gas mass flow rate.

[0021] Furthermore, the flow channel performance parameters include average values, extreme values, and mean square errors obtained by summarizing and statistically analyzing simulation calculation results of each single flow channel in the multi-channel parallel flow channel three-dimensional model.

[0022] Furthermore, the calculation model includes a VOF multiphase flow model.

[0023] According to another aspect of the present invention, there is also provided a plate flow channel, comprising a main flow channel and a branch flow channel, wherein the main flow channel and the branch flow channel are both arranged on the plate, and a plurality of branch flow channels are arranged in parallel and at intervals, and the plate flow channel is designed using the above-mentioned plate flow channel design method.

[0024] Furthermore, the branch flow channel is a zigzag branch flow channel, which includes a first bending section and a first straight section. The bending angle of the first bending section is 130° to 140°, and the length of the first straight section is in the range of 6 mm to 8 mm.

[0025] Furthermore, a plurality of zigzag branch flow channels are arranged in parallel and at intervals, and a repetition period of two adjacent zigzag branch flow channels is 1 mm to 2 mm.

[0026] Furthermore, the branch channel is an arc-shaped branch channel, which includes a second bending segment and a second straight segment, the bending angle of the second bending segment is 120° to 130°, and the length range of the second straight segment is 3mm to 5mm.

[0027] Furthermore, a plurality of arc-shaped branch flow channels are arranged in parallel and at intervals, and a repetition period of two adjacent arc-shaped branch flow channels is 1 mm to 2 mm.

[0028] According to another aspect of the present invention, a fuel cell is provided, comprising a plate, on which a plate flow channel is arranged, and the plate flow channel is the plate flow channel mentioned above.

[0029] The technical solution of the present invention is applied to determine the size boundary parameters in order to set the constraints of the flow channel design. The setting of the flow channel size boundary parameters, such as the repetition period, the vertical distance between the highest point and the lowest point, etc., can ensure that the design scheme meets the requirements in terms of physical feasibility and manufacturing processability. At the same time, this setting also provides a unified benchmark for subsequent flow channel performance comparison, avoiding unfair comparisons caused by different size parameters. Multiple flow channel schemes are designed according to the size boundary parameters so as to find the optimal design through comparative evaluation. Establishing three-dimensional models for multiple flow channel schemes can more realistically reflect the flow conditions inside the flow channel. Through simulation, key performance parameters such as the flow channel pressure drop, GDL surface coverage, and liquid water volume fraction of each flow channel scheme are obtained, thereby pre-evaluating the feasibility of each design scheme and reducing the number and cost of subsequent experimental verification. By comparing the pressure drop, GDL surface coverage, liquid water volume fraction and other indicators of different flow channel designs, the drainage performance and gas distribution capacity of each scheme can be quantitatively evaluated, thereby selecting the design with the best comprehensive performance. After determining the optimal flow channel scheme, outputting its specific structural size parameters is crucial for the transformation from design to manufacturing. Specific structural dimension parameters include flow channel width, depth, shape, etc., which will be directly used to guide the manufacture of the flow channel to ensure that the final plate flow channel has the expected high drainage performance and good gas distribution capacity. Through the above-mentioned plate flow channel design method proposed by the present invention, the multi-channel parallel plate flow channel is designed, and the drainage performance and matching between the multiple flow channels are comprehensively evaluated and optimized, which solves the problem that the existing plate flow channel design method lacks the design and evaluation of multi-channel parallel flow channels, resulting in insufficient drainage performance and uneven gas distribution of the designed multi-channel flow channel system. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0031] Figure 1 A schematic diagram showing the structure of a zigzag electrode plate flow channel according to an embodiment of the present invention is shown;

[0032] Figure 2 A schematic diagram showing the structure of an arc-shaped electrode plate flow channel according to an embodiment of the present invention is shown;

[0033] Figure 3 A schematic diagram showing the dimension boundaries of the plate flow channel of an embodiment of the present invention;

[0034] Figure 4 A schematic diagram showing a minimum repeating unit of a zigzag-shaped electrode plate flow channel according to an embodiment of the present invention;

[0035] Figure 5A schematic diagram showing a minimum repeating unit of an arc-shaped electrode plate flow channel according to an embodiment of the present invention;

[0036] Figure 6 A method flow chart showing a method for designing a plate flow channel according to an embodiment of the present invention;

[0037] Figure 7 A flowchart showing the steps of obtaining corresponding flow channel performance parameters of a method for designing a plate flow channel according to an embodiment of the present invention is shown;

[0038] Figure 8 A schematic diagram showing the flow channel pressure drop, GDL surface coverage, and liquid water volume fraction in the flow channel of a zigzag plate flow channel according to an embodiment of the present invention is shown;

[0039] Fig. 9 A schematic diagram showing the flow channel pressure drop, GDL surface coverage, and liquid water volume fraction in the flow channel of an arc-shaped electrode flow channel according to an embodiment of the present invention; and

[0040] Fig.10 A schematic diagram comparing gas flow distribution between a zigzag-shaped electrode plate flow channel and an arc-shaped electrode plate flow channel according to an embodiment of the present invention is shown.

[0041] The above drawings include the following reference numerals:

[0042] 1. Main flow channel; 2. Branch flow channel; 21. Zigzag branch flow channel; 211. First bending segment; 212. First straight segment; 22. Arc-shaped branch flow channel; 221. Second bending segment; 222. Second straight segment. DETAILED DESCRIPTION

[0043] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0044] See also Figures 1 to 10 As shown, the present invention provides a method for designing a plate flow channel, comprising:

[0045] Determine the dimension boundary parameters of the plate flow channel in a repetitive cycle;

[0046] Design the flow channel structure scheme within a single repetition cycle according to the repetition cycle size boundary parameters;

[0047] For each flow channel structure scheme, a multi-channel parallel model is established; a three-dimensional model simulation calculation is performed on multiple multi-channel parallel flow channel schemes to obtain flow channel performance parameters of each multi-channel parallel flow channel scheme;

[0048] Compare the flow channel performance parameters of multiple multi-channel parallel flow channel solutions to determine the optimal flow channel solution;

[0049] Determine the flow channel structure size parameters corresponding to the optimal flow channel solution and output the flow channel structure size parameters.

[0050] In the above technical scheme, the dimension boundary parameters are determined to set the constraints of the flow channel design. The setting of the flow channel dimension boundary parameters, such as the repetition period, the vertical distance between the highest point and the lowest point, etc., can ensure that the design scheme meets the requirements in terms of physical feasibility and manufacturing processability. At the same time, this setting also provides a unified benchmark for the subsequent flow channel performance comparison, avoiding unfair comparisons caused by different dimension parameters. Multiple flow channel schemes are designed according to the dimension boundary parameters so as to find the optimal design through comparative evaluation. Establishing three-dimensional models for multiple flow channel schemes can more realistically reflect the flow conditions inside the flow channel. Through simulation, key performance parameters such as the flow channel pressure drop, GDL surface coverage, and liquid water volume fraction of each flow channel scheme are obtained, so as to pre-evaluate the feasibility of each design scheme and reduce the number and cost of subsequent experimental verification. By comparing the pressure drop, GDL surface coverage, liquid water volume fraction and other indicators of different flow channel designs, the drainage performance and gas distribution capacity of each scheme can be quantitatively evaluated, so as to select the design with the best comprehensive performance. After determining the optimal flow channel scheme, outputting its specific structural dimension parameters is crucial for the transformation from design to manufacturing. Specific structural dimension parameters include flow channel width, depth, shape, etc., which will be directly used to guide the manufacture of the flow channel to ensure that the final plate flow channel has the expected high drainage performance and good gas distribution capacity. Through the above-mentioned plate flow channel design method proposed by the present invention, the multi-channel parallel plate flow channel is designed, and the drainage performance and matching between the multiple flow channels are comprehensively evaluated and optimized, which solves the problem that the existing plate flow channel design method lacks the design and evaluation of multi-channel parallel flow channels, resulting in insufficient drainage performance and uneven gas distribution of the designed multi-channel flow channel system.

[0051] In one embodiment of the present invention, the steps of performing three-dimensional model simulation calculations on a plurality of multi-channel parallel flow channel schemes respectively and obtaining flow channel performance parameters of each multi-channel parallel flow channel scheme include:

[0052] Establish a multi-channel parallel flow channel three-dimensional model for a single multi-channel parallel flow channel solution;

[0053] Perform flow simulation calculations on a three-dimensional model of multi-channel parallel flow channels based on a computational model;

[0054] Get simulation calculation results;

[0055] The flow channel performance parameters of a single multi-channel parallel flow channel solution are obtained by statistical simulation calculation results;

[0056] Repeat the above steps to obtain the flow channel performance parameters of multiple multi-channel parallel flow channel solutions.

[0057] In the above technical solution, the establishment of a three-dimensional model of a multi-channel parallel flow channel is mainly used as the basis for subsequent fluid flow simulation calculations, so as to more accurately reflect the geometric structure of the flow channel and the actual situation of the internal fluid flow, especially the distribution and interaction of gas and liquid water between the flow channels. Using the VOF (Volume of Fluid) multiphase flow model or other computational fluid dynamics (CFD) models, the established three-dimensional model of the multi-channel parallel flow channel can be dynamically simulated to obtain detailed information on the gas-liquid two-phase flow inside the flow channel, including how the gas passes through the liquid water layer, how the liquid water is distributed and discharged in the flow channel, etc., which is crucial for evaluating the drainage performance and gas distribution consistency of the flow channel. The simulation calculation will generate a large amount of data, including key performance parameters such as the flow channel pressure drop at different time points, the surface coverage of the GDL (Gas Diffusion Layer), and the volume fraction of liquid water in the flow channel. These data not only reflect the performance of a single flow channel, but also reflect the mutual influence between the flow channels, such as whether the liquid water is evenly distributed among multiple flow channels and whether the gas is distributed consistently among multiple flow channels. By designing multiple multi-channel parallel flow channel schemes and performing independent 3D model building and flow simulation calculations on each scheme, the performance of different design schemes can be comprehensively compared.

[0058] In one embodiment of the present invention, the dimension boundary parameters include a repetition period T and a line spacing d between a straight line where the highest point is located and a straight line where the lowest point is located.

[0059] In the above technical solution, the plate flow channel is obtained by arranging and connecting multiple identical flow channel segments according to a certain periodic pattern. The flow channel segments within a repetition period T are representative enough to represent the structure and size of the overall flow channel. Based on this, multi-channel parallel modeling and simulation calculations can significantly reduce the amount of calculation and improve the efficiency of modeling and simulation calculations on the one hand, and can also obtain sufficient and convincing data on the other hand. Within the line spacing d between the straight line where the highest point is located and the straight line where the lowest point is located, at least two parallel flow channels are included to ensure that the flow channel scheme designed within the limited size boundary is a multi-channel parallel scheme. Designing the flow channel under the condition of limited size boundary parameters can ensure that the performance evaluation between different design schemes is carried out on the same or similar basic conditions. This makes the evaluation results more comparable, so that the advantages and disadvantages of different flow channel designs can be evaluated more fairly.

[0060] In one embodiment of the present invention, the plurality of multi-channel parallel flow channel solutions include a zigzag branch flow channel solution and an arc-shaped branch flow channel solution.

[0061] In the above technical solution, the fuel cell will produce liquid water during operation. If it is not discharged in time, it will block the flow channel, affect the gas transmission efficiency, and thus reduce the battery performance. The design of the zigzag flow channel has a larger bending angle at the bend of the flow channel, which makes the liquid water slope more gentle in the upward section, which helps to guide the liquid water to discharge; while the arc-shaped flow channel may reduce fluid resistance and improve gas flow efficiency through its smooth curve, while using the curved surface characteristics to improve the distribution of liquid water. By comparing these two designs, a better water management solution can be found. The design of multiple parallel flow channels needs to consider the uniformity of gas distribution among the flow channels. The zigzag flow channel may increase the interaction between the flow channels through the complexity of its structure, thereby affecting the gas distribution; while the smooth curve of the arc-shaped flow channel may provide a more uniform flow path, which helps to evenly distribute the gas among multiple flow channels.

[0062] In one embodiment of the present invention, the simulation calculation results include the channel pressure drop of a single channel in the multi-channel parallel channel three-dimensional model, the GDL surface coverage, the liquid water volume fraction in the channel, and the gas mass flow rate.

[0063] In the above technical solution, the flow channel pressure drop reflects the resistance encountered by the gas when flowing in the flow channel, and is an important parameter for evaluating the flow channel design. During the operation of the fuel cell, the size of the gas pressure drop directly affects the gas transmission efficiency and the overall pressure drop of the stack, thereby affecting the energy consumption and efficiency of the fuel cell. The GDL surface coverage refers to the area ratio of the gas diffusion layer in contact with the inner surface of the flow channel, reflecting the gas transmission efficiency from the flow channel to the electrode. High GDL surface coverage means that more gas can directly contact the electrode and participate in the electrochemical reaction, thereby improving the power output of the fuel cell. In addition, GDL also has a water-conducting effect. Good surface coverage helps to effectively discharge liquid water and avoid water blockage. Therefore, the GDL surface coverage is an important indicator for evaluating the performance of the flow channel design in gas transmission and water management. The liquid water volume fraction is an indicator to measure the water accumulation in the flow channel. By calculating the liquid water volume fraction in the flow channel, the ability of the flow channel design in water management, such as the distribution, aggregation and discharge efficiency of liquid water, can be evaluated. Optimizing the flow channel design to reduce the liquid water volume fraction helps to improve the stability and life of the fuel cell. The flow channel pressure drop, GDL surface coverage, and liquid water volume fraction in the flow channel are selected as the parameters for the simulation calculation results of a single flow channel because they cover the key performance indicators of the flow channel design in fluid dynamics, gas transmission, and water management, and can comprehensively evaluate the impact of the flow channel design on the overall performance of the fuel cell. By comparing the performance of different design schemes on these parameters, it is possible to identify flow channel designs that perform better in ensuring gas transmission and effective water management, thereby guiding the optimization of the flow channel and improving the efficiency, stability, and life of the fuel cell.

[0064] In one embodiment of the present invention, the flow channel performance parameters include average values, extreme values, and mean square errors obtained by summarizing and statistically analyzing simulation calculation results of each single flow channel in a three-dimensional model of multi-channel parallel flow channels.

[0065] In the above technical solution, the statistical quantities such as the mean, extreme value, and mean square error of these parameters are set in order to systematically evaluate the comprehensive performance of the multi-channel parallel flow channel solution based on the simulation calculation results of a single flow channel, including the impact of different multi-channel parallel flow channels on fluid flow, gas distribution, and water management. By comparing the performance of different design schemes on these parameters, designers can more accurately identify the optimal flow channel design, thereby improving the efficiency, stability, and economy of the fuel cell through the optimal flow channel design. This comprehensive and systematic evaluation method is a key step in the flow channel design optimization process.

[0066] In one embodiment of the present invention, the calculation model includes a VOF multiphase flow model.

[0067] In the above technical solution, the VOF (Volume of Fluid) multiphase flow model has the functions of gas-liquid interface tracking, multiphase flow characteristics simulation, viscosity and density change processing, and fluid-solid coupling. Through the simulation calculation of the VOF model, the complex phenomenon of gas-liquid two-phase flow in the fuel cell flow channel can be effectively simulated and analyzed, so that designers can have a deeper understanding of the fluid behavior in the flow channel and obtain simulation calculation results, and optimize the flow channel structure on this basis to achieve the purpose of improving the drainage performance of the fuel cell and the consistency of gas flow distribution.

[0068] See also Figures 1 to 10 As shown, the present invention also provides a plate flow channel, including a main channel 1 and a branch flow channel 2, the main channel 1 and the branch flow channel 2 are both arranged on the plate, a plurality of branch flow channels 2 are arranged in parallel and spaced apart, and the plate flow channel is designed by the above-mentioned plate flow channel design method.

[0069] In the above technical solution, the main function of the main channel 1 is to evenly distribute the reaction gas (such as hydrogen and oxygen) from the inlet to each branch channel 2, ensuring that the gas can cover the entire electrode surface and participate in the electrochemical reaction. In addition, the main channel 1 also undertakes the task of collecting and guiding liquid water to be discharged from the electrode surface. By designing the structure and size of the main channel 1, the flow direction of water can be controlled to avoid water blocking the channel and affecting gas transmission and battery performance. The branch channel 2 is responsible for further transmitting the gas distributed by the main channel 1 to each tiny area of ​​the electrode, promoting full contact between the gas and the electrode, and improving the reaction efficiency. The design of the branch channel 2 also needs to consider the effective discharge of liquid water to avoid water accumulation in the channel. By setting specific geometric shapes, such as broken lines or arcs, at different positions of the branch channel 2, the principles of fluid dynamics can be used to guide liquid water to converge and discharge out of the fuel cell. Parallel spacing helps to optimize the gas flow path, control pressure drop and flow resistance, and also facilitates the management of liquid water to avoid water blockage.

[0070] In one embodiment of the present invention, the branch channel 2 is a zigzag branch channel 21, which includes a first bending segment 211 and a first straight segment 212. The bending angle of the first bending segment 211 is 130° to 140°, and the length range of the first straight segment 212 is 6mm to 8mm.

[0071] In the above technical solution, the branch flow channel 2 is designed to be a zigzag shape, including a first bent segment 211 and a first straight segment 212, and their angles and lengths are controlled, aiming to optimize the gas transmission and liquid water management of the fuel cell through fluid dynamic effects, while maintaining the stability and manufacturing feasibility of the flow channel structure, ultimately improving the efficiency and life of the fuel cell.

[0072] In one embodiment of the present invention, a plurality of zigzag branch flow channels 21 are arranged in parallel and spaced apart, and the repetition period of two adjacent zigzag branch flow channels 21 is 1 mm to 2 mm. In the above technical solution, a plurality of zigzag branch flow channels 21 are arranged in parallel and spaced apart to ensure that the gas is evenly diffused between the flow channels, avoiding an increase in gas flow resistance due to too small a spacing, or uneven gas distribution due to too large a spacing.

[0073] In one embodiment of the present invention, the branch channel 2 is an arc-shaped branch channel 22, and the arc-shaped branch channel 22 includes a second bending segment 221 and a second straight segment 222. The bending angle of the second bending segment 221 is 120° to 130°, and the length of the second straight segment 222 is in the range of 3mm to 5mm. In the above technical solution, the branch channel 2 is designed to be arc-shaped, including the second bending segment 221 and the second straight segment 222, and their angles and lengths are controlled, in order to optimize the gas transmission and liquid water management of the fuel cell through the fluid dynamics effect, while maintaining the stability and manufacturing feasibility of the channel structure, and ultimately improving the efficiency and life of the fuel cell.

[0074] In one embodiment of the present invention, a plurality of arc-shaped branch flow channels 22 are arranged in parallel and spaced apart, and the repetition period of two adjacent arc-shaped branch flow channels 22 is 1 mm to 2 mm. In the above technical solution, a plurality of arc-shaped branch flow channels 22 are arranged in parallel and spaced apart to ensure that the gas is evenly diffused between the flow channels, avoiding an increase in gas flow resistance due to too small a spacing, or uneven gas distribution due to too large a spacing.

[0075] In one embodiment of the present invention, the dimension boundary of the minimum repeating unit of the flow channel is determined, the repeating period T = 15mm, and the vertical distance between the highest point and the lowest point d = 8mm. Figure 4 The design scheme 1 of the zigzag flow channel shown in FIG. Figure 5 Design Scheme 2 of the arc-shaped flow channel shown in the figure. Among them, the bending angle of the bending section of Design Scheme 1 is 136°, and the length of the straight section is 7mm, while the bending angle of the bending section of Design Scheme 2 is 126°, and the length of the straight section is 4mm. Three-dimensional models of parallel 8-channel flow channels are established for Design Schemes 1 and 2, respectively. Based on the VOF multiphase flow model, the gas-liquid two-phase flow simulation calculations of multiple parallel flow channels of Design Schemes 1 and 2 are performed, and the flow channel pressure drop, GDL surface coverage, and liquid water volume fraction in the flow channel under the two flow channel designs are statistically analyzed, and the following are obtained: Figures 8 to 10 Data shown. From the simulation calculation parameters and statistical data of Design Scheme 1 and Design Scheme 2, it can be seen that the unevenness of the gas mass flow rate of the 8 flow channels in Design Scheme 1 is 24.1%, and the unevenness of the gas mass flow rate of the 8 flow channels in Design Scheme 2 is 18.7%. Comprehensively comparing the quantitative indicators of drainage performance of different flow channel designs, the flow channel pressure drop, GDL surface coverage, and liquid water volume fraction in the flow channel of flow channel design scheme 2 are all better than those of design scheme 1; in addition, the gas mass flow distribution of multiple flow channels in flow channel design scheme 2 is more uniform. Therefore, it is determined that design scheme 2 has the best drainage performance in this group of flow channel designs.

[0076] See also Figures 1 to 10As shown, the present invention further provides a fuel cell, including a plate, on which a plate flow channel is arranged, and the plate flow channel is the plate flow channel of the above embodiment.

[0077] In the above technical solution, by arranging multi-channel parallel plate flow channels designed by the above-mentioned flow channel design method on the plate, the management efficiency of gas and liquid water can be effectively improved, energy loss can be reduced, the reaction efficiency and thermal stability of the battery can be enhanced, and ultimately the overall performance of the fuel cell can be improved.

[0078] From the above description, it can be seen that the above-mentioned embodiments of the present invention achieve the following technical effects: Determining the dimension boundary parameters is to set the constraints of the flow channel design. The setting of the flow channel dimension boundary parameters, such as the repetition period, the vertical distance between the highest point and the lowest point, etc., can ensure that the design scheme meets the requirements in terms of physical feasibility and manufacturing processability. At the same time, this setting also provides a unified benchmark for subsequent flow channel performance comparison, avoiding unfair comparisons caused by different dimension parameters. According to the dimension boundary parameters, multiple flow channel schemes are designed to facilitate finding the optimal design through comparative evaluation. Establishing three-dimensional models for multiple flow channel schemes can more realistically reflect the flow conditions inside the flow channel. Through simulation, key performance parameters such as the flow channel pressure drop, GDL surface coverage, and liquid water volume fraction of each flow channel scheme are obtained, thereby pre-evaluating the feasibility of each design scheme and reducing the number and cost of subsequent experimental verification. By comparing the pressure drop, GDL surface coverage, liquid water volume fraction and other indicators of different flow channel designs, the drainage performance and gas distribution capacity of each scheme can be quantitatively evaluated, thereby selecting the design with the best comprehensive performance. After determining the optimal flow channel solution, outputting its specific structural dimension parameters is crucial for the transformation from design to manufacturing. Specific structural dimension parameters include flow channel width, depth, shape, etc., which will be directly used to guide the manufacture of the flow channel to ensure that the final electrode plate flow channel has the expected high drainage performance and good gas distribution ability. Through the above-mentioned electrode plate flow channel design method proposed in the present invention, the multi-channel parallel electrode plate flow channel is designed, and the drainage performance and matching between multiple flow channels are comprehensively evaluated and optimized, which solves the problem that the existing electrode plate flow channel design method lacks the design and evaluation of multi-channel parallel flow channels, resulting in insufficient drainage performance and uneven gas distribution of the designed multi-channel flow channel system.

[0079] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0080] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0081] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for designing a plate flow channel, characterized in that: include: Determine the dimension boundary parameters of the plate flow channel within a repetition cycle; Design the flow channel structure scheme within a single repetition cycle according to the repetition cycle size boundary parameters; For each flow channel structure scheme, establish its multi-channel parallel model; Perform three-dimensional model simulation calculations on multiple multi-channel parallel flow channel schemes to obtain flow channel performance parameters of each multi-channel parallel flow channel scheme; Compare the flow channel performance parameters of multiple multi-channel parallel flow channel solutions to determine the optimal flow channel solution; Determine the flow channel structure size parameters corresponding to the optimal flow channel solution and output the flow channel structure size parameters.

2. The electrode plate flow channel design method according to claim 1, characterized in that: The steps of performing three-dimensional model simulation calculations on a plurality of multi-channel parallel flow channel schemes respectively to obtain flow channel performance parameters of each multi-channel parallel flow channel scheme include: establishing a multi-channel parallel flow channel three-dimensional model for a single multi-channel parallel flow channel scheme; Perform flow simulation calculations on a three-dimensional model of multi-channel parallel flow channels based on a computational model; Get simulation calculation results; The flow channel performance parameters of a single multi-channel parallel flow channel solution are obtained by statistical simulation calculation results; Repeat the above steps to obtain the flow channel performance parameters of multiple multi-channel parallel flow channel solutions.

3. The electrode plate flow channel design method according to claim 1, characterized in that: The dimension boundary parameters include the repetition period T and the line spacing d between the straight line where the highest point is located and the straight line where the lowest point is located.

4. The electrode plate flow channel design method according to claim 1, characterized in that: The plurality of multi-channel parallel flow channel solutions include a zigzag branch flow channel solution and an arc-shaped branch flow channel solution.

5. The electrode plate flow channel design method according to claim 2, characterized in that: The simulation results include the pressure drop of a single channel in the three-dimensional model of multi-channel parallel channels, the GDL surface coverage, the liquid water volume fraction in the channel, and the gas mass flow rate.

6. The electrode plate flow channel design method according to claim 2, characterized in that: The flow channel performance parameters include the average value, extreme value and mean square error obtained by summarizing the simulation calculation results of each single flow channel in the multi-channel parallel flow channel three-dimensional model.

7. The electrode plate flow channel design method according to claim 2, characterized in that: The calculation model includes VOF multiphase flow model.

8. A plate flow channel, characterized in that: The invention comprises a main flow channel (1) and a branch flow channel (2), wherein the main flow channel (1) and the branch flow channel (2) are both arranged on a plate, and a plurality of the branch flow channels (2) are arranged in parallel and spaced apart, and the plate flow channel is a plate flow channel designed by the plate flow channel design method according to any one of claims 1 to 7.

9. The electrode plate flow channel according to claim 8, characterized in that: The branch channel (2) is a zigzag branch channel (21), the zigzag branch channel (21) comprising a first bending section (211) and a first straight section (212), the bending angle of the first bending section (211) being 130° to 140°, and the length of the first straight section (212) being in the range of 6 mm to 8 mm.

10. The electrode plate flow channel according to claim 9, characterized in that: The plurality of zigzag branch flow channels (21) are arranged in parallel and at intervals, and the repetition period of two adjacent zigzag branch flow channels (21) is 1 mm to 2 mm.

11. The electrode plate flow channel according to claim 8, characterized in that: The branch channel (2) is an arc-shaped branch channel (22), and the arc-shaped branch channel (22) comprises a second bending section (221) and a second straight section (222), the bending angle of the second bending section (221) is 120° to 130°, and the length of the second straight section (222) is in the range of 3 mm to 5 mm.

12. The electrode plate flow channel according to claim 11, characterized in that: The plurality of arc-shaped branch flow channels (22) are arranged in parallel and at intervals, and the repetition period of two adjacent arc-shaped branch flow channels (22) is 1 mm to 2 mm.

13. A fuel cell, characterized in that: It comprises a pole plate, on which the pole plate flow channel is arranged, and the pole plate flow channel is the pole plate flow channel according to claim 8.

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