Polar plate with bionic flow channel, fuel cell, and vehicle

Abstract

The present invention discloses a plate, fuel cell, and vehicle with biomimetic flow channels, including a plate body, a flow field main inlet disposed at the center of the plate body, and four first-level main channels evenly branching out from the bottom of the flow field main inlet to the surrounding areas. Each first-level main channel branches out two second-level branch channels; a plurality of branch end flow channels are branched out from each second-level branch channel, and the main branch end flow channels on each second-level branch channel are distributed in parallel. To further enhance flow and mass transfer, the second-level branch channel and subsequent flow channels are provided with a variable cross-section tapered structure, and a micro-angle is provided at the front end of each bifurcation. Each branch is evenly distributed to the next level. Under the synergistic effect of the butterfly wing vasculature and the variable diameter tapered structure, the plate has the characteristics of low energy consumption, low flow resistance, and high material and energy exchange efficiency.

Description

Technical Field

[0001] The present invention belongs to the field of fuel cells, and in particular relates to a polar plate with a bionic flow channel, a fuel cell and a vehicle. Background Art

[0002] Fuel cells are highly efficient and clean energy devices that directly convert the chemical energy of fuel into electricity. Proton exchange membrane fuel cells (PEMFCs) are particularly prominent, boasting energy conversion efficiencies as high as 60%, low operating temperatures, low noise levels, fast and reliable startup, and simplified maintenance. Their mature technology has led to widespread application in transportation, aerospace, portable energy, and combined heat and power generation. Despite this, the commercialization of PEMFCs still faces numerous technical challenges, including performance enhancement, thermal management, water management, and lifespan extension.

[0003] In a PEMFC, the bipolar plate is a core component, responsible for transporting reactants, facilitating heat dissipation and drainage, and supporting the electrodes. Its flow channel design is crucial and impacts overall performance. The plate's shape is primarily designed based on its functional requirements: ensuring uniform distribution of reactant gases, effectively collecting and conducting current, and providing adequate mechanical support. Currently available bipolar plate flow channel configurations include parallel, serpentine, and interdigitated flow fields. However, these bipolar plates all suffer from high pressure drop, uneven heat flow, localized overheating ("hot spots"), and drainage difficulties. Parallel flow channel designs are simple, easy to manufacture and maintain, and provide uniform liquid and gas distribution, but they also offer uneven flow distribution and pose challenges to thermal management. Serpentine flow channels provide thorough mixing and a high pressure drop, but can also lead to uneven heat flow and localized overheating. Interdigitated flow channels offer excellent drainage and good gas-catalyst contact, but they also suffer from high pressure drop, uneven gas distribution, and challenges to thermal management.

[0004] To address these common problems, the prior art has designed numerous biomimetic plate structures inspired by natural vascular structures (such as animal lungs and leaves). For example, see patent CN111261894 A, which discloses a bipolar plate with a high-performance, complex biomimetic flow field and its preparation method; patent CN208904142 U, which discloses a hybrid flow field proton exchange membrane fuel cell bipolar plate based on biomimetic principles; and patent CN112993311 A, which discloses a stamped biomimetic flow field fuel cell bipolar plate and gas delivery method. However, the inlet and outlet of existing biomimetic plate flow fields are located at either end of the plate, and typically have one inlet and one outlet. Reactants enter through the inlet and slowly flow along the flow channel toward the other end, requiring a long path to reach the outlet. This can easily lead to uneven flow and the risk of channel blockage. Furthermore, the design of certain enclosed areas and right-angle corners can lead to secondary flows and localized resistance, affecting flow efficiency, temperature field, and velocity field distribution, which can adversely affect overall stability and efficiency. Summary of the Invention

[0005] In order to solve the technical problems existing in the prior art, the purpose of the present invention is to provide a bipolar plate, a fuel cell and a vehicle with a bionic flow channel.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0007] In the first aspect, the present invention provides a bipolar plate structure with a bionic flow channel, including a plate body, a flow field main inlet is arranged in the center of the plate body, and four first-level main channels are evenly branched from the bottom of the flow field main inlet to the surrounding areas, and each first-level main channel branches out into two second-level branch channels; each second-level branch channel is branched step by step along the flow direction of the reactants, and branches out into a number of branch channels and branch channels in turn, the length of the branch channel decreases step by step, and the cross-sectional area of ​​the branch channel also decreases step by step, and the fork formed by the two second-level branch channels and the fork angle formed by the branch channel and the branch channel branched out with it are both acute angles.

[0008] The present invention designs the inlet to the center of the electrode plate, and then the flow channel spreads from the center of the electrode plate to the surrounding areas, and several outlets are set (the branch end flow channel is the outlet in this application), shortening the path between the total inlet and outlet of the flow field, solving the risk of uneven flow and blockage in the flow channel.

[0009] As a further technical solution, the second-level diversion channel includes a first-section diversion channel, a second-section diversion channel and a third-section diversion channel connected in sequence; the angle between the first-section diversion channel and the first-level main channel is 130°-140°; the angle between the first-section diversion channel and the second-section diversion channel is 130°-140°; the angle between the second-section diversion channel and the third-section diversion channel is 130°-140°.

[0010] As a further technical solution, the angle between the first sections of the two second-stage branch channels branched from the same main channel is 45~55°.

[0011] As a further technical solution, the first-stage branch-end flow channel that branches out from the second-stage branch channel along the flow direction of the reactants includes two sections of branch-end flow channels. The angle between the first section of the branch-end flow channel and the first-stage branch channel that branches out from it is 45~55°, and the first section of the branch-end flow channel and the second section of the branch-end flow channel are at an obtuse angle.

[0012] As a further technical solution, in addition to the first-stage branch end flow channel, the other branch end flow channels branched out from the second-stage branch flow channel along the flow direction of the reactants are straight branch end flow channels and are parallel to each other.

[0013] As a further technical solution, each branch channel includes a first section of branch channel and a second section of branch channel, and the angle between the first section of branch channel and the second section of branch channel is 130°-140°.

[0014] As a further technical solution, the flow channel on the electrode body forms a front-to-back and left-to-right symmetrical structure.

[0015] In a second aspect, the present invention discloses a battery comprising the bipolar plate with bionic flow channels as described above.

[0016] In a third aspect, the present invention discloses a vehicle on which the above-mentioned battery is installed.

[0017] The beneficial effects of the present invention are as follows:

[0018] The present invention is based on butterfly wing vessels and proposes a bionic flow plate structure, in which the total inlet of the flow field is designed to the center of the electrode plate, and then the flow channel diffuses from the center of the electrode plate to the surrounding areas, and several outlets are set (the branch end flow channel is the outlet in this application), shortening the path between the total inlet and outlet of the flow field, solving the risk of uneven flow and blockage in the flow channel; improving the output performance of the electrode plate as a whole, and in order to enhance transport and disturbance, the angles of the forks at all levels are acute angles (preferably 45~55°), and the adjacent branch channels adopt a variable cross-section design, that is, the cross-sectional area of ​​the latter branch channel is smaller than the cross-sectional area of ​​the former branch channel. This design can not only reduce the cross-sectional area of ​​the airflow flow, thereby accelerating the flow velocity of the airflow, improving the flow performance in the fuel cell, and allowing the gas to pass through the flow channel faster; it also helps to reduce the splashing of water droplets in the flow channel, can discharge water in time, and improve flooding.

[0019] Furthermore, each branch channel includes a first branch channel section and a second branch channel section, and the angle between the first branch channel section and the second branch channel section is 130°-140°, that is, a micro-corner is formed at the front end of each fork; this design further improves the flow performance within the fuel cell, allowing the gas to pass through the channel faster; and helps to reduce the splashing of water droplets in the channel, enabling timely discharge of water and improving flooding. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings, which constitute 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 improper limitations on the present invention.

[0021] Figure 1 Schematic diagram of the morphology and function of the butterfly wing vascular system with bionic structure, as well as the technical design route.

[0022] Figure 2 Schematic diagram of the bionic structure application of the variable diameter flow field plate in an embodiment of the present invention, in which 1 is the central flow channel inlet, 2 is the first-stage main flow channel, 3 is the second-stage branch flow channel, 4 is the branch flow channel, and 5 is the branch end flow channel;

[0023] Figure 331 is a partially enlarged cross-sectional view of a flow channel in an embodiment of the present invention, in which numeral 31 is a first section of a branch flow channel, 32 is a first section of a branch flow channel, and 33 is a third section of a branch flow channel; numeral 41 is a first section of a branch flow channel, 42 is a second section of a branch flow channel, 51 is a first section of a branch end flow channel, and 52 is a second section of a branch end flow channel;

[0024] Figure 4 Comparison of polarization curves of bionic structure and serpentine structure.

[0025] Figure 5 This is the current density distribution cloud diagram of the bionic structure and the serpentine structure.

[0026] Figure 6 This is the hydrogen molar concentration distribution cloud diagram of the bionic structure and the serpentine structure.

[0027] Figure 7 Temperature distribution cloud diagram of bionic structure and serpentine structure.

[0028] Figure 8 This is the drainage distribution cloud map of the bionic structure and the serpentine structure.

[0029] Figure 9 This is the fluid velocity distribution cloud map of the bionic structure and the serpentine structure.

[0030] Figure 10 This is a graph showing the changes in various parameters over working time in aging experiment data.

[0031] Figure 11 This is a curve comparison chart of the data processed by the SG filter and the original data.

[0032] Figure 12 This is the flow chart of the BP neural network algorithm structure.

[0033] Figure 13 This is the R coefficient calculation chart.

[0034] Figure 14 This is the prediction curve of the BP neural network algorithm. DETAILED DESCRIPTION

[0035] It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meaning as commonly understood by those skilled in the art to which the present invention belongs.

[0036] 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 invention. As used herein, unless otherwise clearly indicated in the present invention, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "include" and / or "comprising" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or their combinations;

[0037] For the convenience of description, if the words "up", "down", "left" and "right" appear in the present invention, they only indicate that they are consistent with the up, down, left and right directions of the drawings themselves, and do not limit the structure. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, they cannot be understood as limiting the present invention.

[0038] As described in the background, the prior art has shortcomings. To address these technical problems, the present invention proposes a bipolar plate, fuel cell, and vehicle with biomimetic flow channels. This biomimetic flow channel is based on the design of a butterfly's wing, which is translucent and has distinct wing veins. Because butterflies often live in cold, high-altitude mountainous areas, the shape and arrangement of their wing veins influence air flow over the wing surface. These characteristics, combined with their heat and mass transfer properties, help them maintain a stable body temperature and reduce energy consumption in low-temperature environments. Therefore, the present invention selects a butterfly's wing vein shape as a novel biomimetic plate structure. This is a naturally optimized network flow channel that enhances heat and mass transfer. These structures feature a uniform distribution of microtubules, mimicking the uniform distribution of vascular channels, resulting in a more uniform distribution of reactant gases within the plate flow field and improved reactant gas utilization. Furthermore, the biomimetic flow channel shape better conforms to the principles of fluid dynamics, reducing fluid flow resistance and pressure drop, thereby improving fluid transfer efficiency. Furthermore, the optimized flow channel shape also facilitates the drainage of liquid water, preventing flooding and further improving the stability and lifespan of the fuel cell.

[0039] Specifically, in a typical embodiment of the present invention, Figure 1 As shown, a PEMFC bipolar plate bionic structure flow field is provided, which is inspired by the shape of a silk butterfly wing. Its vascular skeleton is reinforced and supported and has body fluid entering. It is an optimized structure that has been tested by time and can evenly distribute the fluid, uniform the temperature field, and has strong hydrophobicity. Specifically, a fuel cell bionic structure is applied to the PEMFC bipolar plate flow field, including a central flow channel inlet 1, a first-level main channel 2, a second-level branch channel 3, and several branch channels 4 and branch end channels 5. The flow channels are symmetrically distributed in the front, back, left and right directions on the plate body as a whole, similar to a silk butterfly wing; specifically, as shown in FIG. Figure 2As shown, the central flow channel inlet 1 is set at the center point, and the fluid is injected from the top and evenly bifurcates into four first-level main channels 2 when reaching the bottom. Each first-level main channel 2 then branches out into two second-level branch channels 3 after passing through the first-level fork; each second-level branch channel 3 is bifurcated step by step along the flow direction of the reactants, and branches out multiple branch channels 5 and branch channels 4. The four first-level main channels 2 are finally bifurcated into a shape similar to the wings of a silk butterfly; and the cross-section of the branch channel 4 becomes smaller every time it passes through a level of bifurcation (preferably, the ratio of the cross-section of the latter level to the cross-section of the previous level is 0.8), and a part of the fluid flows directly out from the branch channel 5. In this embodiment, each second-level branch channel 3 is bifurcated into 6 branch channels, and the length of the 6 branch channels gradually becomes smaller from the center position of the bipolar plate body to the outside until the fluid flow is completed.

[0040] The aforementioned biomimetic flow channel, shaped like a butterfly's wing, features a streamlined venation structure, similar to a symmetrical tree-like pipe. The microchannel is a symmetrical structure mirror-symmetrical along the central axis, featuring tapered channels and corners. This structure exhibits efficient fluid dynamics, optimizing the fluid's flow path, increasing its velocity and flow rate, and reducing resistance encountered during flow, thereby reducing turbulence and eddies. This reduces energy loss, improves flow efficiency, and enhances gas flow efficiency and uniform distribution, thereby enhancing performance and lifespan. Furthermore, the aforementioned first-stage main channel 2 is a straight main channel, with four first-stage main channels 2 oriented at 90 degrees to each other.

[0041] Furthermore, in order to enhance the transport and disturbance effects, the present invention also makes the following designs:

[0042] like Figure 3 As shown, the second-stage runner 3 in this embodiment includes a first-stage runner 31, a second-stage runner 32, and a third-stage runner 33 connected in sequence; the angle between the first-stage runner 31 and the first-stage runner is 130°-140°; the angle between the first-stage runner 31 and the second-stage runner 32 is 130°-140°; the angle between the second-stage runner 32 and the third-stage runner 33 is 130°-140°; and the length of the first-stage runner 31 is smaller than that of the second-stage runner 32, and the length of the third-stage runner 33 is smaller than that of the second-stage runner 32.

[0043] The angle between the first sections of the two second-stage branch channels branched from the same main channel is 45-55 degrees.

[0044] like Figure 3As shown, in this embodiment, the first-stage branch channel that branches out along the flow direction of the reactants from the second-stage branch channel comprises two sections of branch channels. The angle between the first-stage branch channel 51 and the first-stage branch channel branching from it is 45-55 degrees, and the first-stage branch channel 51 forms an obtuse angle with the second-stage branch channel 52. Except for the first-stage branch channel, the other branch channels that branch out along the flow direction of the reactants from the second-stage branch channel are straight and parallel to each other, and the length of the multiple-stage branch channels gradually decreases.

[0045] like Figure 3 As shown, each branch channel 4 includes a first branch channel 41 and a second branch channel 42. The angle between the first branch channel 41 and the second branch channel 42 is 130°-140°. The length of the first branch channel 41 is longer than that of the second branch channel 42. The purpose of the second branch channel 42 is to set a slight corner 7 at the front end of each fork.

[0046] Furthermore, the cross section of each branch end flow channel gradually narrows along the flow direction of the reactants.

[0047] The above design can further reduce the cross-sectional area of ​​airflow, thereby accelerating the flow velocity of the airflow, improving the flow performance within the fuel cell, and allowing the gas to pass through the flow channel faster; it also helps to reduce the splashing of water droplets in the flow channel, can drain water in time, and improve flooding.

[0048] Table 1 below shows the main dimensions and design parameters of the bipolar plate in this embodiment.

[0049] Table 1 Dimensions and design parameters of bipolar plates

[0050]

[0051] To verify the improved output performance of the proposed biomimetic structure of the fuel cell bipolar plate, a comparison was made with the existing serpentine flow field. Modeling and numerical simulation were performed using tools such as ANSYS and SolidWorks. Based on experimental results from the literature, the model parameters were adjusted to complete the experimental verification of the PEMFC model. The simulation results were qualitatively and quantitatively analyzed using evaluation methods such as polarization curves and distribution cloud maps. Finally, a BP degradation modeling algorithm in Matlab was used to establish a device life prediction. The specific steps are as follows:

[0052] Step 1: Establish a three-dimensional CFD model of the proton exchange membrane fuel cell, such as Figures 1-3As shown, the model includes basic conservation equations and electrochemical equations. Numerical simulation and model verification were performed using the professional simulation software ANSYS Fluent. Modeling, meshing, and numerical simulation were performed in ANSYS. Based on experimental results from PEMFC studies in the literature, the model parameters were adjusted to complete the experimental verification of the PEMFC model.

[0053] Step 2: Design a new bionic flow field for flat-plate PEMFC. Analyze the influence of size and structure through numerical simulation. After literature research, select the target shape, study the principle of bionic flow field enhancement of mass transfer, and study the new bionic flow field structure. Draw the model structure, analyze the simulation results, and further optimize the flow field junction shape. Perform parameter analysis and cloud map analysis on the simulation results, including polarization curves, reaction gas distribution, current density distribution, etc. Figures 4 to 9 shown.

[0054] from Figure 4 and Figure 5 It can be seen that compared with the serpentine structure, the polarization curve of the bionic structure of the present invention is higher, and its current density distribution is also higher, which are 1.7132 and 1.8043 A / cm respectively. 2 ,After the improvement, the maximum and average current densities are higher, indicating a good output ,performance.

[0055] from Figure 6 and Figure 7 It can be seen that there are many prominent hot spots and concentration peaks in the serpentine structure, while the gas distribution and temperature distribution of the bionic structure proposed in the present invention are more uniform, so the bionic structure has greater advantages.

[0056] from Figure 8 and Figure 9 It can be seen that the serpentine structure has a serious flooding phenomenon, while the bionic structure proposed in the present invention has better hydrophobicity; compared with the bionic structure, the flow rate is more uniform, and the maximum and average values ​​are larger.

[0057] Step 3: Based on the degradation modeling algorithm, briefly analyze the remaining life of the fuel cell equipment. Figures 10 to 14 As shown in the figure, based on the degradation model, the dynamic aging data of PEMFC under stable operating conditions in the IEEE 2014 data challenge is used as a training dataset to predict the remaining useful life (RUL). A model-driven method based on the SG filter and BP voltage decay model is proposed to predict the degradation of PEMFC in the frequency domain.

[0058] Figure 10The data show the changes in inlet temperature and pressure, flow rate, and moisture content during fuel cell aging testing. Analysis of the curves reveals that under steady-state conditions, the fuel cell stack voltage fluctuates significantly and decreases over time, while other parameters such as temperature and humidity do not show a clear degradation trend. Therefore, this paper selected PEMFC output voltage as a metric to characterize fuel cell aging. Given that aging typically occurs in hours, while the test platform's data acquisition frequency reaches milliseconds, the original data was resampled and the sampling interval adjusted. Ultimately, 3462 resampled data points were obtained for subsequent algorithm training and validation.

[0059] Before using voltage data for prediction, it must be preprocessed, as the experiment contains significant noise and abnormal signals such as sudden drops due to faults. For data filtering, the Savitzky-Golay filter is commonly used. This filter allows flexible selection of different window widths at any point on the same curve to meet diverse smoothing filtering requirements. It exhibits significant advantages in processing time series data, particularly across various stages. Furthermore, it is highly effective in processing noise samples originating from non-periodic and nonlinear factors.

[0060] Figure 11 Using filtered experimental data, the detailed variation trends of the fuel cell's total voltage (represented by the blue curve) and filtered voltage (represented by the red curve) over a 1200-hour period are shown. The figure shows that the total voltage is at a high level at the beginning of the test, then gradually decreases but with large fluctuations, ultimately approaching 3.05V. The filtered voltage curve closely follows the total voltage, also showing a downward trend, but with relatively small fluctuations. This demonstrates that filtering effectively reduces noise in the raw voltage data, making the data smoother and removing many abnormal, sudden changes. It also improves data accuracy without changing the signal trend or width, facilitating subsequent algorithm model training. Assuming the width of the filter window is n=2m+1, and the measurement points are x=(-m,-m+1,0,1,…m-1,m), a k-1-order polynomial is used to fit the data points within the window:

[0061]

[0062] For the above fitting equation, a k-variable linear equation system is formed:

[0063]

[0064] It is expressed in matrix form as:

[0065]

[0066] in A The least squares solution of is:

[0067]

[0068] Y The model prediction or filtered value of is:

[0069]

[0070] The SG convolution smoothing algorithm is an improvement of the moving smoothing algorithm, which can obtain the matrix least squares solution estimate:

[0071]

[0072] After filtering, the data is then processed by the BP neural network algorithm. The neural network consists of three parts: input layer, hidden layer and output layer. Figure 12 As shown. Assume that the input layer data is x, the hidden unit is n, the input layer to hidden layer parameters are w, b1, the hidden layer to output layer parameters are v, b2, and the activation function is g1, g2, then the model output prediction value for:

[0073]

[0074] in:

[0075]

[0076]

[0077] Specifically, data starts at the input layer, undergoes a linear transformation of weights and biases, and then passes through the activation layer to generate the output of the hidden layer, which also serves as the input of the next layer. When data flows from the hidden layer to the output layer, it also undergoes a linear transformation of weights and biases, and then passes through the activation layer to finally generate the output layer result. The forward transmission process from the input layer to the hidden layer and then to the output layer is called forward propagation, which is often the process of setting up the model. The implementation process is as follows:

[0078] 1) Initialize the weights and biases of the algorithm. They are respectively:

[0079]

[0080] 2) Activate forward propagation to obtain the expected value of each layer output and loss function .in represents the true value, represents the predicted value, m、n express m Group, n Output of dimensional data:

[0081]

[0082] 3) According to the loss function, the error terms of the output unit and the hidden unit are calculated respectively, and their gradient values ​​or partial derivatives are:

[0083]

[0084] 4) Update the weights and biases in the neural network:

[0085] Output unit parameter update:

[0086]

[0087] Hidden unit parameter update:

[0088]

[0089] Where eta represents the learning rate, k=1, 2, …, n represents the number of updates or iterations, with k=1 representing the first update, and so on. Repeat steps 2) through 4) until the loss function falls below a predetermined threshold or the number of iterations is exhausted. The optimal parameters are then output.

[0090] Figure 13 This is the R coefficient calculation diagram of the BP neural network algorithm. It can be seen that the R value of the system is 0.9977, which is close to 1, indicating a high degree of fitting.

[0091] Figure 14 This is the prediction result output by the BP neural network. It can be seen that the predicted value can closely follow the changing trend of the filtered value, and has less fluctuation and noise than the filtered value, and smaller deviation. At the same time, the model can reflect the voltage change more in real time. It can be considered that the predicted value has a good fitting effect on the filtered value.

[0092] exist Figure 14 In the calculation, the deviation of the predicted value is calculated based on the error evaluation, which mainly includes a variety of error indicators to measure the accuracy of the model prediction. These indicators include R 2 (coefficient of determination), mean square error (MSE), root mean square error (RMSE), and mean absolute percentage error (MAPE). 2 MSE and MSE are mainly used to measure the difference between the predicted value and the true value, while RMSE and MAPE provide the absolute size of the error and the relative size of the error, which helps to comprehensively evaluate the prediction performance of the model.

[0093] Among them, R 2 The coefficient of determination measures how well the model fits the data. The closer its value is to 1, the better the model fits the data. is the true value, is the predicted value, is the mean of the true values, n is the sample size. The calculation formula is:

[0094]

[0095] The mean squared error (MSE) measures the average of the sum of the squares of the differences between the predicted values ​​and the true values. The root mean squared error (RMSE) is the square root of the mean squared error. The MSE calculation formula is:

[0096]

[0097] The mean absolute percentage error (MAPE) measures the average percentage error between the predicted value and the true value. It is calculated as:

[0098]

[0099] Finally, the error indicators calculated R2, MSE, RMSE, and MAPE values ​​were 0.99543, 0.0018968, 0.0028737, and 0.00057762, respectively. It can be seen that the model has high accuracy and good fitting effect.

[0100] Example 2

[0101] This embodiment discloses a battery, which includes two plates with bionic flow channels as described in Example 1, one is a cathode plate and the other is an anode plate. The flow channels of the two plates are exactly the same, and a diffusion layer, a catalytic layer, a proton exchange membrane, a diffusion layer, and a catalytic layer are arranged in sequence between the cathode plate and the anode plate.

[0102] Example 3

[0103] This embodiment discloses a vehicle on which the battery described in Embodiment 2 is installed.

[0104] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A plate with a bionic flow channel, characterized in that: It includes a plate body, a flow field main inlet is set at the center of the plate body, and four first-level main channels are evenly branched from the bottom of the flow field main inlet to the surrounding areas, and each first-level main channel branches out two second-level branch channels; each second-level branch channel is bifurcated step by step along the flow direction of the reactant, and branches out a number of branch channels and branch channels in turn, the length of the branch channel decreases step by step, the cross-sectional area of ​​the branch channel also decreases step by step, and the fork formed by the two second-level branch channels and the fork angle formed by the branch channel and the branch channel branched out with it are both acute angles.

2. The electrode plate with bionic flow channel according to claim 1, characterized in that: The second-level branch channel includes a first-section branch channel, a second-section branch channel and a third-section branch channel connected in sequence; the angle between the first-section branch channel and the first-level main channel is 130°-140°; the angle between the first-section branch channel and the second-section branch channel is 130°-140°; the angle between the second-section branch channel and the third-section branch channel is 130°-140°.

3. The electrode plate with bionic flow channel according to claim 1, characterized in that: The angle between the first sections of the two second-stage branch channels branched from the same main channel is 45-55 degrees.

4. The electrode plate with bionic flow channel according to claim 1, characterized in that: The first-stage branch end flow channel branched out from the second-stage branch channel along the flow direction of the reactants includes two sections of branch end flow channels, the angle between the first section of the branch end flow channel and the first-stage branch channel branched out from it is 45~55°, and the first section of the branch end flow channel and the second section of the branch end flow channel form an obtuse angle.

5. The electrode plate with bionic flow channel according to claim 4, characterized in that: Except for the first-stage branch end flow channel, the other branch end flow channels branched out from the second-stage branch flow channel along the flow direction of the reactants are straight branch end flow channels and are parallel to each other.

6. The electrode plate with bionic flow channel according to claim 4, characterized in that: Each branch channel includes a first section of branch channel and a second section of branch channel, and the angle between the first section of branch channel and the second section of branch channel is 130°-140°.

7. The electrode plate with bionic flow channel according to claim 1, characterized in that: The cross section of each branch end flow channel gradually narrows along the flow direction of the reactants.

8. The electrode plate with bionic flow channel according to claim 1, characterized in that: The flow channel on the plate body forms a front-to-back and left-to-right symmetrical structure.

9. A fuel cell, characterized in that: The invention comprises two plates with bionic flow channels as claimed in any one of claims 1 to 8, wherein one plate is a cathode plate and the other is an anode plate.

10. A vehicle, characterized in that: A fuel cell comprising the fuel cell according to claim 9.

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