Novel fuel cell monomer with parallel structure

Abstract

The invention discloses a novel fuel cell monomer with a parallel structure, which comprises a first insulating layer, a first cathode flow channel, a first membrane electrode, an anode flow channel, a second membrane electrode, a second cathode flow channel and a second insulating layer, and relates to the technical field of cells. According to the novel fuel cell monomer with the parallel structure, through spatial layout reconstruction and circuit design innovation, comprehensive optimization from a microcosmic reaction interface to macroscopic system integration is formed, a breakthrough is made in improving two core indexes of the energy density and the compression volume, and meanwhile, the manufacturing cost and the working condition adaptability are considered; and key technical obstacles are cleared up for large-scale application of the fuel cell in the fields of new energy automobiles, portable equipment and the like.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a novel fuel cell monomer with parallel structure. BACKGROUND

[0002] The current technical background of fuel cell stack integration and monolithic structure design mainly focuses on structure optimization, packaging integration, thermal management and intelligent control. In terms of structure design, the traditional screw fastening method is gradually replaced by composite pull rod and flexible pressing technology. For example, the composite pull rod structure combined with fixed plate and connecting rod replaces the traditional screw, which can effectively avoid the end plate warping and stack collapse problem, reduce the number of insulating plates to reduce the cost, and ensure the temperature consistency of the core and the end through the integrated cooling flow channel design of the front and rear end plates, thereby improving the overall performance. The flexible pressing technology uses disc spring or air bag elements to dynamically adjust the pressing force, for example, using an air bag as a volume changing element, the flexible support of the core is realized through fluid pressure regulation, which can not only buffer vibration impact, but also adapt to the pressing needs of different models of stacks, thereby improving the universality.

[0003] The fuel cell monomer battery structure comprises, from the outside to the inside, a membrane electrode, a glue film and a bipolar plate. The membrane electrode comprises a membrane electrode carbon paper layer, a membrane electrode PEN frame and a membrane electrode proton exchange membrane. The glue film is composed of a glue film base material and glue film adhesive on both sides. The bipolar plate comprises an anode plate and a cathode plate. The surface of the three is provided with a bipolar plate air inlet cavity, a cooling water inlet cavity and a hydrogen outlet cavity on one side, and is provided with a hydrogen inlet cavity, a cooling water outlet cavity and an air outlet cavity on the other side. The middle part is a reaction zone. Special adhesive surfaces are provided around the corresponding cavities and the edges of the reaction zone. The layers are adhered and sealed by curing the glue film adhesive, replacing the traditional elastic sealing gasket. There are two implementation modes of welding the anode plate and the cathode plate and independently setting (adding a sealing ring in the water field of the anode plate). The glue film base material is polyamide resin or polyethylene terephthalate, with a thickness of 0.1-0.15mm. The bipolar plate base material can be selected from 316 stainless steel and can be coated with a carbon coating. This structure solves the risk of traditional sealing failure, improves the stack efficiency of the stack, the product consistency and reduces the cost.

[0004] However, the current fuel cell scheme similar to the present application is in the traditional "single cathode-anode" structure, which cannot break through the low power density problem caused by the traditional configuration, as follows.

[0005] The current monolithic cell and stack have the following disadvantages:

[0006] 1. Single cell power density and volume limitation (main disadvantage)

[0007] Traditional single cell adopts a "single cathode-anode" structure, the reaction area is limited, resulting in low power density per unit volume. Although multi-piece stacking can increase the voltage, it requires complex interlayer connection (such as bipolar plate, sealing element), which increases the volume and contact resistance. For example, although graphite bipolar plate is corrosion-resistant, it is thick and has high brittleness, making it difficult to achieve compact design.

[0008] 2. Insufficient flexibility of voltage regulation

[0009] Traditional fuel cells need to achieve high-voltage output by connecting multiple single cells in series, which has high system complexity and large volume. For application scenarios that require low voltage and high current (such as portable devices), it is difficult to adapt flexibly through existing structures, and external circuit conversion is needed, which increases energy loss.

[0010] The invention aims to solve the problems of volume expansion, limited power density, and short service life caused by the low voltage of single cell and the concentration of cathode load in traditional fuel cells. The invention proposes a sandwich structure (double cathode clamping single anode) and single in-series design: doubling the reaction area through double cathode to improve power density, connecting the ear to the full surface of the current collection path to shorten the current transmission distance and reduce internal resistance, and reducing the mass transfer path through double-side coordinated oxygen supply to suppress concentration polarization and achieve system compactness, high efficiency, and long life. The invention provides an innovative solution for high-energy density and low-cost fuel cells. SUMMARY

[0011] To overcome the shortcomings of the prior art, the present application provides a new parallel structure fuel cell monomer, which solves the problems of single cell power density and volume limitation and insufficient flexibility of voltage regulation.

[0012] To achieve the above purpose, the present application realizes the following technical scheme: a new parallel structure fuel cell monomer, characterized in that: the single cell adopts a stacked symmetrical structure, and includes the following components in order from bottom to top;

[0013] a first insulating layer, a first cathode flow channel, a first membrane electrode, an anode flow channel, a second membrane electrode, a second cathode flow channel, and a second insulating layer;

[0014] The surfaces of the first cathode flow channel, the anode flow channel, and the second cathode flow channel are provided with flow guide tabs;

[0015] The flow guide tabs are divided into cathode flow guide tabs and anode flow guide tabs, and the cathode flow guide tabs are located on the surfaces of the first cathode flow channel and the second cathode flow channel, and the anode flow guide tabs are located on the surface of the anode flow channel.

[0016] Preferably, the first and second insulation layers are polyimide films or ceramic coatings with a thickness of 0.05-0.15 mm and a surface coated with high-temperature-resistant insulating glue, the first insulation layer is used for insulation during stacking, and the second insulation layer is used for covering the top layer to complete insulation.

[0017] Preferably, the flow guide grooves of the first and second cathode flow channels are serpentine or parallel arrays with a depth of 0.5-1.2 mm and a width of 1.0-2.0 mm, the first cathode flow channel is used to guide air to be uniformly distributed to the membrane electrode, and the second cathode flow channel is symmetrical to the first cathode flow channel to ensure uniform air supply.

[0018] Preferably, the first and second membrane electrodes comprise a proton exchange membrane, a cathode catalyst layer and an anode catalyst layer, and are core electrochemical reaction zones, wherein the second membrane electrode is arranged symmetrically to the first membrane electrode and shares the same anode flow channel.

[0019] Preferably, the anode flow channel is one of carbon fiber felt, metal foam or porous graphite, and is a porous flow guide structure, and supplies hydrogen to the first and second membrane electrodes.

[0020] Preferably, the flow guide tab is made of copper-plated silver material with a thickness of 0.2-0.5 mm and a distribution density of 4-6 per cm, and is distributed at the edge of the battery to connect an external circuit, thereby achieving efficient collection and distribution of current.

[0021] The application provides a novel parallel structure fuel cell monomer.

[0022] 1. The novel parallel structure fuel cell monomer has a significantly improved power density, a sandwich structure of double cathodes clamping a single anode is adopted, a double-layer electrochemical reaction interface is formed inside the single cell, the effective reaction area is larger than that of a traditional single cathode-anode structure, the unit volume power density is broken through, and the core defect of insufficient reaction area in the traditional design is successfully overcome.

[0023] 2. The novel parallel structure fuel cell monomer has a significantly compressed system volume, voltage doubling characteristics are achieved by using double cathodes in series in the single cell, the output voltage of the single cell can be doubled compared with the traditional design, the number of stacks is reduced under the same total voltage requirement, the interlayer bipolar plate and sealing assembly are saved, the overall volume of the system is reduced, and the problem of bloated volume caused by multiple stacks is completely solved.

[0024] 3. The novel parallel structure fuel cell monomer has an optimized energy conversion efficiency, the current transmission path is shortened and homogenized by the full-surface current collection design of the external lug, the contact resistance and ohmic polarization loss are reduced, the internal resistance is reduced, the energy output stability is significantly improved, and the voltage output is maintained more stable, especially under high current working conditions.

[0025] 4、The new parallel structure fuel cell monomer, application scene adaptability enhances, through the double cathode in single piece supports flexible series parallel combination, does not need to rely on complex external circuit can adapt to different equipment voltage / current demand, for example, single use 1.4V output or double piece series realizes 2.8V, both simplify system architecture and reduce the additional energy loss brought by DC-DC conversion. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is the split schematic diagram of the structure monomer fuel cell of the present application;

[0027] Figure 2 It is the schematic diagram of the structure fuel cell stack of the present application;

[0028] Figure 3 It is the schematic diagram of the structure monomer fuel cell of the present application.

[0029] In the figure: 1, first insulation layer;2, first cathode flow channel;3, first membrane electrode;4, anode flow channel;5, flow guide lug;6, second membrane electrode;7, second cathode flow channel;8, second insulation layer. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application are clearly and completely described, obviously, the described embodiments are only part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the present application.

[0031] Please refer to Figure 1 And Figure 3 The embodiments of the present application provide a technical solution: a new parallel structure fuel cell monomer, the single piece battery adopts laminated symmetrical configuration, sequentially includes the following components from bottom to top;

[0032] First insulation layer 1: located at the bottom, polyimide film (thickness 0.1mm) is adopted, the surface is coated with high-temperature resistant insulating glue, used for insulation in the stacking process.

[0033] First cathode flow channel 2: used for guiding air to be uniformly distributed to the membrane electrode, processed from graphite or metal bipolar plate, the surface is provided with serpentine flow guide groove (depth 0.8mm, width 1.5mm), the edge is embedded in silicone rubber sealing gasket (width 2mm).

[0034] First membrane electrode 3: containing proton exchange membrane (such as Nafion212), cathode catalyst layer (Pt / C, loading 0.4mg / cm 2 ) and anode catalyst layer (PtRu / C, loading 0.2mg / cm 2), effective reaction area 80 cm 2 , as the core electrochemical reaction zone.

[0035] Anode flow channel 4: located between two membrane electrodes, using a porous flow guide structure (porosity 70%, thickness 0.5 mm), while providing hydrogen for the upper and lower two membrane electrodes.

[0036] Second membrane electrode 6: symmetrically arranged with the first membrane electrode 3, sharing the same anode flow channel 4.

[0037] Second cathode flow channel 7: symmetric with the first cathode flow channel 2, ensuring uniform air supply.

[0038] Second insulation layer 8: covers the top layer, completes insulation, and the material is consistent with the bottom layer.

[0039] Flow guide tab 5: distributed on the edge of the battery, connected to the external circuit to achieve efficient current collection and distribution, the flow guide tab 5 is divided into cathode flow guide tab and anode flow guide tab, and the cathode flow guide tab is located on the surface of the first cathode flow channel 2 and the second cathode flow channel 7, and the anode flow guide tab is located on the surface of the anode flow channel 4.

[0040] Among them, some schemes can be replaced for new fuel cell configuration.

[0041] 1. Tab optimization

[0042] Concentrate the cathode and anode flow guide tabs 5 on one side of the battery or distribute them differently to simplify the stack stacking process, set multiple flow guide tabs 5 on the edge of each battery, evenly distribute to increase current collection points, integrate the function of flow guide tab 5 into the bipolar plate, and form a conductive channel by etching or stamping.

[0043] 2. Parallel-serial hybrid connection

[0044] Locally use parallel connection in the stack (such as parallel connection of every two batteries), and then connect them in series as a whole.

[0045] Therefore, its partial optimization can be modified according to actual application.

[0046] Example 1: portable power module

[0047] 1. Single structure parameters

[0048] Size specification: single flat size is 50mm x 50mm, total thickness is 3mm (traditional single thickness ≥5mm).

[0049] First insulation layer 1 and second insulation layer 8: polyimide film, thickness 0.1mm, surface coated with high-temperature resistant silicone insulation layer (thickness 0.05mm).

[0050] First cathode flow channel 2 and second cathode flow channel 7: graphite bipolar plate, flow channel is designed as a serpentine, channel depth 0.8mm, channel width 1.5mm, sealing gasket is made of silicone material (width 2mm).

[0051] First membrane electrode 3 and second membrane electrode 6: proton exchange membrane is Nafion212, cathode catalyst is Pt / C (loading 0.4mg / cm 2 ), anode catalyst is PtRu / C (loading 0.2mg / cm 2 ), effective reaction area 80cm 2 .

[0052] Common anode flow channel 4: carbon fiber felt (porosity 70%, thickness 0.5mm), transversely penetrates the center area of the battery, hydrogen inlet and outlet are located at the two side edges.

[0053] Flow guide tab 5: copper-plated silver material, thickness 0.3mm, distributed at the four corners of the battery, each tab width 5mm, connected to the bipolar plate by laser welding.

[0054] 2. Assembly process

[0055] Lamination sequence:

[0056] The first insulating layer 1 is laid at the bottom;

[0057] The first cathode flow channel 2, the first membrane electrode 3, the anode flow channel 4, the second membrane electrode 6, the second cathode flow channel 7 and the top second insulating layer 8 are sequentially stacked.

[0058] Hot pressing and curing: hot pressing at 120℃, 1MPa pressure for 10 minutes, to ensure that each layer is tightly attached.

[0059] Tab welding: laser welding is used to fix the flow guide tab (5) to the edge of the cathode flow channel (2), with a welding point spacing of 2mm.

[0060] 3. Electrochemical performance test

[0061] Single cell preparation: three single cells are assembled and connected in series (as shown in the attached Figure 2 ).

[0062] Test conditions:

[0063] Temperature: 60℃±1℃;

[0064] Hydrogen / air pressure: 0.1MPa / 0.15MPa;

[0065] Humidity: dry on the hydrogen side, 60%RH on the air side;

[0066] Load scan rate: 10mA / cm 2 ·s.

[0067] Polarization curve vs. power density

[0068]

[0069] Conclusion

[0070] Power density doubled: peak power density reached 1.63 W / cm 2 , 98.8% higher than the conventional design (0.82 W / cm 2 ).

[0071] High current stability: voltage maintained at 1.10 V at 1200 mA / cm 2 , 162% higher than the conventional design (0.42 V).

[0072] 1000 hours continuous operation durability test

[0073] Test conditions:

[0074] Constant load: 800 mA / cm 2 ;

[0075] Start-stop cycle: 1 hour stop every 24 hours to simulate actual use.

[0076] Voltage decay comparison

[0077]

[0078] Conclusion:

[0079] The voltage decay of the present invention after 1000 hours is only 6.4%, much lower than the 25.9% of the conventional design;

[0080] The stability of the membrane electrode structure is significantly improved, and the catalyst layer does not appear obvious peeling.

[0081] At the same time, for the fuel cell stack using such a monolithic cell structure, the connection form between the internal flow guide tabs is as shown in Figure 2 ;

[0082] Among them, the flow guide tab 5 is divided into cathode flow guide tab and anode flow guide tab. Taking a three-cell stack as an example, the connection form of the flow guide tab 5 is illustrated.

[0083] Taking a three-cell stack (denoted as A, B, C) as an example, the connection steps of the flow guide tab 5 are as follows (black lines represent connection):

[0084] The cathode flow guide tab is located at the edge of the upper surface of the cell, and the anode flow guide tab is located at the corresponding position of the lower surface.

[0085] Connection method:

[0086] First cell A: its cathode current collector tab is connected to the anode current collector tab of the second cell B by welding or wire.

[0087] Second cell B: its cathode current collector tab is connected to the anode current collector tab of the third cell C in the same way.

[0088] Third cell C: as the end of the stack, its cathode current collector tab is connected to an external load, and its anode current collector tab is connected to the negative pole of a power supply, forming a complete circuit.

[0089] Example 2: Vehicle-mounted fuel cell stack

[0090] 1. Stack design

[0091] Number of monomers: 20 pieces, size 200 mm x 150 mm x 3 mm.

[0092] Connection method: every 5 monomers are connected in parallel to form a group (high current module), and 4 groups are connected in series to form a 48V output.

[0093] Current collector tab 5 optimization: the tab is distributed in a ring shape at the edge of the cell and is integrated into the etched groove of the bipolar plate (groove depth 0.5 mm, width 3 mm).

[0094] 2. Key processes

[0095] Flow channel processing: the cathode flow channel uses 316L stainless steel bipolar plates, which are processed by photochemical etching to form parallel array flow channels (depth 1.0 mm, width 1.2 mm).

[0096] Anode flow channel 4 processing: the common anode flow channel uses a 3D printed titanium metal grid (porosity 65%, thickness 0.6 mm), and the surface is coated with a carbon coating to prevent corrosion.

[0097] Sealing scheme: laser welding is used to seal the edge, replacing the traditional adhesive film, and the pressure resistance is improved to 0.3 MPa.

[0098] 3. Performance test

[0099] Temperature: 80℃±2℃;

[0100] Hydrogen / air pressure: 0.2 MPa / 0.25 MPa;

[0101] Humidity: dry on the hydrogen side and 70% RH on the air side;

[0102] Output mode: 48V constant voltage, load gradually increased from 50A to 200A.

[0103] Internal resistance and efficiency comparison

[0104]

[0105] Key parameters:

[0106] Internal resistance measurement: Electrochemical impedance spectroscopy (EIS) shows that the internal resistance of the invention is 0.05 Ω (0.1 Ω for traditional design);

[0107] Energy conversion efficiency: The efficiency under 200A load reaches 63%, which is 29.9% higher than that of traditional design (48.5%).

[0108] Temperature distribution uniformity test

[0109] Test method: Infrared thermal imager monitors the surface temperature of the stack (Example 2, 200A load)

[0110]

[0111] Conclusion:

[0112] The symmetrical structure of the double cathode makes the heat distribution uniform, with a maximum temperature difference of only 2.1℃ (5.8℃ for traditional design);

[0113] The cooling water flow rate can be reduced to 2L / min (3L / min is required for traditional design), saving 33% energy.

[0114] Water management performance test

[0115] Test method: High-speed camera observes the liquid water discharge in the cathode flow channel

[0116]

[0117] Volume and weight comparison, Example 1 and traditional design comparison;

[0118]

[0119] Experimental conclusion

[0120] Through the above experimental data, it can be proved that:

[0121] Power density breakthrough: The double reaction interface design makes the power density increase by nearly 100%, with a peak of 1.63W / cm 2 ;

[0122] High efficiency and durability: Energy conversion efficiency is increased to 65%, and 1000 hour attenuation rate is less than 7%;

[0123] Compact: Volume energy density is increased by 60%, and stack thickness is reduced by 40%;

[0124] Thermal management optimization: Temperature gradient is reduced by 64%, and cooling energy consumption is reduced by 33%.

[0125] Working principle

[0126] The core of the present application is to achieve reaction area multiplication, current path optimization and flexible voltage output through structural innovation. The specific principles are as follows:

[0127] 1. Sandwich structure of double-cathode clamping single-anode

[0128] Reaction interface multiplication:

[0129] The common anode flow channel 4 is located between the two membrane electrodes, and hydrogen diffuses to the upper and lower sides at the same time through the porous structure.

[0130] The double-cathode flow channel supplies oxygen to the cathode side of the upper and lower membrane electrodes respectively, forming a double-layer electrochemical reaction interface, and the effective reaction area is increased by 100%.

[0131] Mass transfer path optimization:

[0132] Oxygen is directly distributed from the guide groove of the double-cathode flow channel to the surface of the membrane electrode, and the mass transfer distance is shortened by 50% (the traditional design needs to pass through the bipolar plate flow channel).

[0133] Hydrogen diffuses bidirectionally through the porous anode flow channel 4, the concentration gradient is uniformized, and the concentration polarization is reduced.

[0134] 2. Guide lug current collection and series mechanism

[0135] Single-piece current path:

[0136] Electrons are collected from the double-cathode flow channel through the guide lug 5, transmitted to the anode lug of the adjacent single cell through the external wire, and form a single-piece series.

[0137] The current of the traditional single cell needs to flow through the bipolar plate and the interlayer connecting piece, and the path length is about 10 cm; the path is shortened to 2 cm through the edge lug in this design, and the internal resistance is reduced by 60%.

[0138] Stack cascade logic:

[0139] Take three pieces in series as an example:

[0140] The double-cathode current of battery A is output to the anode of battery B through the guide lug 5;

[0141] The double-cathode current of battery B is output to the anode of battery C;

[0142] The cathode lug of battery C is connected to the load, and the anode lug of battery A is connected to the negative electrode of the power supply, forming a complete circuit.

[0143] The total voltage is the cumulative of single-piece voltage (for example, 1.4V for a single piece, 4.2V for three pieces in series), while the traditional design needs to stack 6 pieces to reach the same voltage.

[0144] 3. Dynamic response and flexibility

[0145] Parallel mode:

[0146] Connecting two cathodes in parallel in a single piece can output double the current (e.g., 1.4V / 10A → 1.4V / 20A), suitable for high-current demand scenarios.

[0147] Hybrid connection:

[0148] Part of the cells in the stack are connected in parallel and then in series (e.g., 2 in parallel and 3 in series), balancing voltage and current requirements, avoiding reliance on external DC / DC converters.

[0149] 4. Heat management and humidity control

[0150] Balanced heat distribution:

[0151] Symmetrical distribution of double reaction interfaces, uniform heat generation, avoiding local overheating (traditional single-sided reaction easily leads to temperature gradient >10℃, this design gradient <3℃).

[0152] Water management optimization:

[0153] Symmetrical design of double cathode flow channels promotes the discharge of condensed water along the direction of gravity, avoiding the phenomenon of membrane flooding.

[0154] Technical effect verification

[0155] Test data from Examples 1 and 2 show that:

[0156] Power density: single piece peak power density up to 1.6W / cm 2 , 100% higher than traditional design (0.8W / cm 2 );

[0157] Volume energy density: portable module up to 320Wh / L, 60% higher than traditional design;

[0158] Efficiency improvement: reduced internal resistance increases energy conversion efficiency by 10%, up to 65%;

[0159] Life test: after 1000 hours of continuous operation, the voltage attenuation rate is <3% (traditional design >8%)

[0160] Overall advantage: This invention, through spatial layout reconstruction and circuit design innovation, forms a full range of optimization from micro reaction interface to macro system integration, achieving breakthroughs in improving energy density and compressing volume, while considering manufacturing cost and working condition adaptability, removing key technical obstacles for fuel cell scale application in new energy vehicles, portable devices and other fields.

[0161] It is to be understood that the terminology used herein such as first and second, and the like, is only used to distinguish one entity or action from another entity or action, and does not necessarily require or imply any such actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0162] While embodiments of the present application have been shown and described with reference to particular embodiments thereof, it will be understood by those skilled in the art that various changes in form and details can be made therein without departing from the spirit and scope of the application. The scope of the application is defined by the appended claims and their equivalents.

Claims

1. A novel parallel structure fuel cell monomer, characterized by: The single-chip battery adopts a stacked symmetrical configuration and includes the following components in order from bottom to top: A first insulating layer (1), a first cathode flow channel (2), a first membrane electrode (3), an anode flow channel (4), a second membrane electrode (6), a second cathode flow channel (7) and a second insulating layer (8); The surfaces of the first cathode flow channel (2), the anode flow channel (4) and the second cathode flow channel (7) are all provided with flow guide tabs (5); The guide tabs (5) are divided into cathode guide tabs and anode guide tabs, and the cathode guide tabs are located on the surface of the first cathode flow channel (2) and the second cathode flow channel (7), and the anode guide tabs are located on the surface of the anode flow channel (4).

2. The novel parallel structure fuel cell monomer according to claim 1, characterized in that: The first insulating layer (1) and the second insulating layer (8) are polyimide films or ceramic coatings with a thickness of 0.05 to 0.15 mm, and are coated with high-temperature resistant insulating glue.

3. The novel parallel structure fuel cell monomer according to claim 2, characterized in that: The first insulating layer (1) is used for insulation during the stacking process, and the second insulating layer (8) is used for covering the top layer to complete the insulation.

4. The novel parallel structure fuel cell monomer according to claim 1, characterized in that: The guide grooves of the first cathode flow channel (2) and the second cathode flow channel (7) are in a serpentine or parallel array, with a depth of 0.5 to 1.2 mm and a width of 1.0 to 2.0 mm.

5. The novel parallel structure fuel cell monomer according to claim 4, characterized in that: The first cathode flow channel (2) is used to guide air to be evenly distributed to the membrane electrode, and the second cathode flow channel (7) is symmetrical to the first cathode flow channel (2), ensuring uniform air supply.

6. The novel parallel structure fuel cell monomer according to claim 1, characterized in that: The first membrane electrode (3) and the second membrane electrode (6) comprise a proton exchange membrane (PEM), a cathode catalyst layer and an anode catalyst layer.

7. The novel parallel structure fuel cell monomer according to claim 1, characterized in that: The anode flow channel (4) is made of one of carbon fiber felt, metal foam or porous graphite and is a porous flow-conducting structure, and simultaneously supplies hydrogen to the first membrane electrode (3) and the second membrane electrode (6).

8. The novel parallel structure fuel cell monomer according to claim 1, characterized in that: The current guide tabs (5) are made of copper-plated silver material and are distributed on the edge of the battery to connect to an external circuit, thereby achieving efficient collection and distribution of current.

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